WO2022176977A1 - Site improvement method - Google Patents
Site improvement method Download PDFInfo
- Publication number
- WO2022176977A1 WO2022176977A1 PCT/JP2022/006644 JP2022006644W WO2022176977A1 WO 2022176977 A1 WO2022176977 A1 WO 2022176977A1 JP 2022006644 W JP2022006644 W JP 2022006644W WO 2022176977 A1 WO2022176977 A1 WO 2022176977A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mass
- powder
- slurry
- component
- less
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 97
- 239000002002 slurry Substances 0.000 claims abstract description 173
- 239000000843 powder Substances 0.000 claims abstract description 142
- 239000002689 soil Substances 0.000 claims abstract description 81
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000005553 drilling Methods 0.000 claims description 54
- 239000000463 material Substances 0.000 claims description 42
- 230000002265 prevention Effects 0.000 claims description 32
- 239000004568 cement Substances 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 18
- 239000002893 slag Substances 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 238000009412 basement excavation Methods 0.000 description 38
- 238000010276 construction Methods 0.000 description 13
- 239000002245 particle Substances 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 230000000903 blocking effect Effects 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000007787 solid Substances 0.000 description 6
- 235000015096 spirit Nutrition 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000002956 ash Substances 0.000 description 4
- 239000004927 clay Substances 0.000 description 4
- 238000013329 compounding Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000008267 milk Substances 0.000 description 4
- 210000004080 milk Anatomy 0.000 description 4
- 235000013336 milk Nutrition 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 3
- 235000012241 calcium silicate Nutrition 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- 239000010883 coal ash Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000010440 gypsum Substances 0.000 description 3
- 229910052602 gypsum Inorganic materials 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- -1 sericite Chemical compound 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000005909 Kieselgur Substances 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 229910052570 clay Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 239000010445 mica Substances 0.000 description 2
- 229910052618 mica group Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 229910021487 silica fume Inorganic materials 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 238000004078 waterproofing Methods 0.000 description 2
- 241000206761 Bacillariophyta Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000003864 humus Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/10—Cements, e.g. Portland cement
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Definitions
- the present invention relates to a ground improvement method, a leakage prevention material for drilling slurry, drilling slurry, use of drilling slurry for drilling soil, and a method for producing drilling slurry.
- a soil improvement method is known in which a column-shaped soil improvement body formed by mixing excavated soil and a cement-based solidifying material such as cement milk is directly formed in the ground.
- the ground is excavated to create a vertical hole, a reinforced cage is inserted into the hole, and concrete is injected to form a concrete pile in the ground.
- the piling method is known.
- One of the foundation pile construction methods for building foundation piles is the pre-boring foot protection method. After excavating the soil with an auger to a predetermined depth (bearing layer) while injecting drilling fluid, foot protection fluid is injected into the tip of the excavation. is erected in this excavation hole, fixed in the foot protection liquid by press-fitting or tapping, and the pile and the ground are integrated by hardening the foot protection liquid and the pile circumference fixing liquid.
- Japanese Patent Application Laid-Open No. 2018-193515 discloses that a humus soil solidification material for improving organic soft ground contains cement, blast furnace slag, and anhydrous gypsum, and that the Blaine specific surface area of this ground granulated blast furnace slag is 8000 cm 2 / is greater than or equal to g.
- the present invention provides a ground improvement method for suppressing the outflow of slurry supplied to the soil during soil excavation or the like to the surrounding ground of the excavated part, a leakage prevention material for excavated slurry, an excavated slurry, and an excavated slurry for soil excavation. and a method for producing a drilling slurry.
- the present invention is a ground improvement method for excavating soil having a density of 0.4 g / cm 3 or more and 2.5 g / cm 3 or less using a slurry containing water (W) and powder (P).
- the powder (P) contains (A) an inorganic powder having a BET specific surface area of 1.2 m 2 /g or more and 5 m 2 /g or less [hereinafter referred to as component (A)], ,
- component (A) an inorganic powder having a BET specific surface area of 1.2 m 2 /g or more and 5 m 2 /g or less [hereinafter referred to as component (A)], ,
- component (A) an inorganic powder having a BET specific surface area of 1.2 m 2 /g or more and 5 m 2 /g or less [hereinafter referred to as component (A)], ,
- component (A) an inorganic powder having a BET specific surface area of 1.2 m 2 /g
- the present invention uses water (W) and powder (P) as powder (P) in a drilling slurry containing water (W) and powder (P) at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less,
- a liquid leakage prevention material for excavation slurry that prevents the excavation slurry from flowing out to the ground around the excavation part, comprising the component (A), wherein the component (A) is 10% with respect to the powder (P)
- the present invention relates to a leakage prevention material for drilling slurry, which is used at a rate of mass % or more.
- the present invention contains water (W) and powder (P) at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less, and the powder (P) is the component (A) It relates to a drilling slurry containing 10% by mass or more.
- the present invention also relates to the use of the above excavation slurry for excavating soil having a density of 0.4 g/cm 3 or more and 2.5 g/cm 3 or less.
- water (W) and powder (P) are blended at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less, and the powder (P) is
- the present invention relates to a method for producing a drilling slurry, in which component (A) is blended in a proportion of 10% by mass or more with respect to (P).
- FIG. 1 shows the mixing ratio of the component (A) in the powder (P) in Examples 3-1a to 3-1h, and the ratio of the slurry passage rate to the slurry passage rate (reference value) of Comparative Example 3-1a. is a graph showing the relationship between
- the mechanism by which the outflow of the slurry supplied to the soil is suppressed is not clear, but the powder (P) contained in the slurry is (A) BET ratio It contains an inorganic powder having a surface area of 1.2 m 2 /g or more and 5 m 2 /g or less [hereinafter referred to as component (A)], and the ratio of component (A) in powder (P) is 10% by mass or more. Therefore, it is considered that this inorganic powder immediately blocks the gaps in the soil physically and suppresses the leakage of the slurry.
- the inventors found that when the amount of powder (P) is small relative to water, the mobility of particles in the slurry is high, so the component (A) moves quickly and can efficiently block the gaps in the soil. Therefore, it was found that the effect of suppressing leakage of slurry by the component (A) is enhanced. Even when the powder (P) is less than the water, if the amount of the powder (P) is out of the predetermined range, the effect of suppressing leakage of the slurry is improved even if the component (A) is used. I found out not to.
- the inventors found that when there is a large amount of powder (P) relative to water, the viscosity of the slurry is generally high and the mobility of the particles inside is low, so the component (A) can efficiently fill the gaps in the soil. It was found that the liquid leakage suppressing effect of the component (A) was difficult to manifest. That is, for soil with many voids filled with air or moisture, the inorganic powder (A) with a specific specific surface area in the powder (P) blocks the gaps in the soil, and the water (W) and the powder ( When the mass ratio ((W)/(P)) of P) is within a specific range, the inorganic powder (A) can efficiently reach the crevices of the soil.
- the present invention was completed based on these findings, and when a slurry having a predetermined mass ratio (W)/(P) of water (W) and powder (P) is used, the hardening of the slurry Since the leakage of the slurry is suppressed without waiting for , it is possible to perform smooth construction during excavation.
- the ground improvement method, leakage prevention material for drilling slurry, and drilling slurry of the present invention are effective in suppressing the outflow of slurry with a relatively large amount of water, and by suppressing the outflow of the slurry, the slurry can function effectively. can.
- the ground improvement method of the present invention excavates soil having a density of 0.4 g / cm 3 or more and 2.5 g / cm 3 or less using a slurry containing water (W) and powder (P).
- the powder (P) contains the (A) component, the proportion of the (A) component in the powder (P) is 10% by mass or more, and the water (W) of the slurry
- the mass ratio (W)/(P) of the powder (P) is 70% by mass or more and 150% by mass or less.
- the slurry used in the soil improvement method of the present invention include a slurry obtained by blending the leakage prevention material for excavation slurry of the present invention and water, which will be described in detail later.
- the mass ratio is represented by "% by mass" it means the ratio of the numerator when the denominator is 100.
- Water (W) includes water used in the field of ground improvement, such as fresh water and seawater.
- Water (W) includes, for example, groundwater, tap water, river water, lake water, and seawater.
- powder (P) an inorganic powder is mentioned.
- Powder (P) exists as a solid in the slurry.
- the powder (P) includes inorganic powders generally used in civil engineering, such as inorganic powders (1) to (4) enumerated for component (A), which will be described later in detail.
- the powder (P) is an inorganic powder having a solubility of 5 or less in 100 cm 3 of water at 20°C.
- the solubility is the maximum mass (g) of powder (P) that can be dissolved in 100 cm 3 of water at 20°C.
- the solubility of component (A) and the solubility of component (B), which will be described later, are also determined by the same method as for the powder (P).
- the powder (P) contains the (A) component.
- the powder (P) contains the component (A) as a slurry leakage prevention material.
- the inorganic powder as the component (A) is not particularly limited, but one or more inorganic powders selected from the following inorganic powders (1) to (4) can be used.
- Pozzolanic powders such as fly ash, silica fume, volcanic ash, woody biomass combustion ash, and silicate clay
- Latent hydraulic powder such as soil (4)
- Silicate such as kaolin, aluminum silicate, clay, talc, mica, calcium silicate, sericite, and bentonite
- Component (A) is one or more inorganic powders selected from the above (1) to (4) from the viewpoint of being safe for addition to soil and being industrially stably available.
- (3) one or more inorganic powders selected from latent hydraulic powders such as coal ash, blast furnace slag, and diatomaceous earth are more preferred, and blast furnace slag is even more preferred.
- Blast furnace slag includes water granulated blast furnace slag, slow-cooled blast furnace slag, and the like.
- Component (A) has a BET specific surface area of 1.2 m 2 /g or more, preferably 1.5 m 2 /g or more, more preferably 1.7 m 2 , from the viewpoint of efficiently closing voids in the ground. /g or more, and from the viewpoint of suppressing the outflow of slurry, it is 5 m 2 /g or less, preferably 4.5 m 2 /g or less, more preferably 4 m 2 /g or less, further preferably 2 m 2 /g or less , and more preferably 1.8 m 2 /g or less.
- the BET specific surface area is calculated by a method based on the BET flow method (single-point method/multi-point method) and "JISZ8830:2013 Method for measuring specific surface area of powder (solid) by gas adsorption". Specifically, the BET specific surface area is calculated by a fully automatic specific surface area measuring device "Macsorb” manufactured by MOUNTECH Co., LTD. From the viewpoint of suppressing the outflow of the slurry into the ground by physically blocking the gaps in the ground, the component (A) is the time from slurry kneading until the slurry is injected into the ground (for example, up to about 1 hour ), and those in which the BET specific surface area does not change significantly are preferable.
- the solubility of component (A) in water at 20°C is preferably 5 or less, more preferably 3 or less, and still more preferably 1 or less, from the viewpoint of efficiently blocking soil pores.
- the average particle size of component (A) is preferably 0.1 ⁇ m or more, more preferably 0.5 ⁇ m or more, and even more preferably 1 ⁇ m or more, from the viewpoint of efficient filling of voids in the soil without the slurry penetrating into the soil. And, from the viewpoint of densely filling the voids of the soil with a large number of particles, the particle size is preferably 100 ⁇ m or less, more preferably 70 ⁇ m or less, and even more preferably 50 ⁇ m or less.
- the average particle size of component (A) is a value calculated using a HORIBA LA-920 laser diffraction/scattering particle size distribution analyzer. In addition, the measurement solvent is ethanol.
- component (A) for example, a powder with a normal particle size distribution and a coefficient of variation of 50 or less can be used.
- the component (A) is preferably non-porous powder.
- non-porous powder as used herein means a powder having a smooth particle surface and having no fine structure such as pores.
- cement obtained by pulverizing clinker, ground granulated blast furnace slag obtained by pulverizing blast furnace slag, etc. are commercialized by pulverizing raw materials with large particle sizes of several centimeters or more industrially. thing applies.
- Powder (P) is, in addition to component (A), optionally (B) an inorganic powder having a BET specific surface area of 0.4 m 2 /g or more and 1.0 m 2 /g or less [hereinafter referred to as component (B)].
- component (B) an inorganic powder having a BET specific surface area of 0.4 m 2 /g or more and 1.0 m 2 /g or less
- the inorganic powder as the component (B) is not particularly limited, and one or more inorganic powders selected from the inorganic powders (1) to (4) listed for the component (A) above are used. be able to.
- Component (B) is safe to be added to soil and is industrially stably available, so that (1) hydraulic powder such as cement and gypsum, (2) fly ash, Pozzolanic powders such as silica fume, volcanic ash, woody biomass combustion ash, silicate clay, etc. (3) Latent hydraulic powders such as coal ash, blast furnace slag, diatomaceous earth, etc. (4) Kaolin, aluminum silicate , clay, talc, mica, calcium silicate, sericite, bentonite and other silicates are preferred.
- Component (B) is preferably, for example, cement or gypsum, and more preferably cement, from the viewpoint of general availability.
- Cement includes ordinary portland cement, blast furnace cement, belite cement, moderate heat cement, high-early-strength cement, super-early-strength cement, sulfate-resistant cement, and the like.
- Component (B) has a BET specific surface area of 0.4 m 2 /g or more, preferably 0.5 m 2 /g or more, more preferably 0.5 m 2 /g or more, from the viewpoint of ensuring powder mixability with component (A).
- 0.6 m 2 /g or more and from the viewpoint of efficiently blocking relatively large voids in the soil, it is 1.0 m 2 /g or less, preferably 0.9 m 2 /g or less, more preferably 0.9 m 2 /g or less. 8 m 2 /g or less.
- the BET specific surface area is calculated by a method based on the BET flow method (single-point method/multi-point method) and "JISZ8830:2013 Method for measuring specific surface area of powder (solid) by gas adsorption". Specifically, the BET specific surface area is calculated by a fully automatic specific surface area measuring device "Macsorb” manufactured by MOUNTECH Co., LTD.
- the solubility of component (B) in water at 20°C is preferably 5 or less, more preferably 3 or less, and still more preferably 1 or less, from the viewpoint of efficiently closing the pores of the soil.
- component (B) for example, a powder with a normal distribution of particle sizes and a coefficient of variation of 50 or less can be used.
- the component (B) is preferably non-porous powder.
- non-porous powder as used herein means a powder having a smooth particle surface and having no fine structure such as pores.
- the slurry contains water (W) and powder (P).
- the mass ratio (W)/(P) of water (W) to the powder (P) is from the viewpoint of ensuring pumpability during construction and increasing the mobility of the powder (A) in the slurry. Therefore, it is 70% by mass or more, preferably 75% by mass or more, more preferably 80% by mass or more, and from an economic point of view such as construction time and material costs associated with slurry injection, a smaller amount of slurry preparation is lost. Since liquid prevention is required, the content is 150% by mass or less, preferably 140% by mass or less, more preferably 130% by mass or less, and even more preferably 110% by mass or less.
- the mass ratio (W)/(P) of water (W) and powder (P) in this slurry is [[content (mass) of water (W) in slurry]/[powder (P ) content (mass)]] ⁇ 100. Also, this mass ratio (W)/(P) can be calculated based on the blending amounts of water (W) and powder (P).
- the proportion of component (A) in the powder (P) is 10% by mass or more, preferably 25% by mass or more, more preferably 30% by mass or more, from the viewpoint of efficiently closing fine voids in the soil. , More preferably 40% by mass or more, more preferably 50% by mass or more, still more preferably 55% by mass or more, and from the viewpoint of wide application to various soils, 100% by mass or less, preferably 80% by mass 70% by mass or less, more preferably 70% by mass or less.
- the powder (P) for example, the ratio of the component (A) in the powder (P) is 100% by mass, that is, the powder composed of the component (A) can be used.
- the amount of component (A), component (B), etc. can be regarded as the respective content in the powder (P) or slurry (the same applies hereinafter).
- the powder (P) contains the (A) component and optionally the (B) component, and the total ratio of the (A) component and the (B) component in the powder (P) is the fine voids in the soil.
- the content is 100% by mass or less, preferably 99% by mass or less, more preferably 98% by mass or less, and still more preferably 95% by mass or less.
- the powder (P) for example, the total ratio of the components (A) and (B) in the powder (P) is 100% by mass, that is, powder composed of the components (A) and (B) is used. be able to.
- the mass ratio (B)/(A) of the content of the component (A) and the content of the component (B) is from the viewpoint of efficiently closing various voids in the soil. Therefore, it is preferably 0.4 or more, more preferably 0.6 or more, still more preferably 1 or more, and preferably 2.3 or less from the viewpoint of efficiently closing both large and fine voids in the soil. , more preferably 2 or less, and still more preferably 1.5 or less.
- the slurry preferably has a content of component (A) in the slurry of 6% by mass or more, more preferably 12% by mass or more, and still more preferably 17% by mass or more, and It is preferably 55% by mass or less, more preferably 50% by mass or less, and even more preferably 44% by mass or less.
- the total content of the (A) component and the (B) component in the slurry is preferably 6 mass from the viewpoint of ensuring the effect of preventing liquid loss.
- % or more more preferably 12 mass % or more, still more preferably 17 mass % or more, and preferably 55 mass % or less, more preferably 50 mass % or less, still more preferably 44 mass % or less.
- the slurry preferably has a funnel viscosity (500 ml/500 ml) of 180 seconds or less, more preferably 150 seconds or less, and even more preferably 120 seconds or less, from the viewpoint of ensuring the pumpability of the slurry during construction and avoiding clogging by the slurry.
- the funnel viscosity is the viscosity measured using a Marsh funnel viscometer, which measures the viscosity based on the outflow time (seconds) required for discharging 500 ml of slurry placed in a 500 ml funnel-shaped container.
- the funnel viscosity can be measured by, for example, the outflow time of the total amount of slurry (500 mL) using a Marsh funnel viscometer (funnel) viscometer (model: KS-192, manufacturer: Kansai Kiki Seisakusho, capacity: 500 mL). Funnel viscosity is, for example, a value measured at 20°C. In addition, from the viewpoint of ensuring the pumpability of the slurry during construction, it is preferable that the outflow time of the slurry is as short as possible.
- the slurry can also contain other ingredients. Examples thereof include AE agents, retarders, foaming agents, thickeners, foaming agents, waterproofing agents, fluidizing agents, dispersing agents and the like.
- the slurry may contain components that dissolve in water.
- Examples of the slurry include excavating slurry supplied to the soil during ground excavation. milk, etc.).
- ground improvement methods of the present invention include ground improvement methods involving soil excavation using slurry.
- the ground improvement method of the present invention is a construction method for excavating soil using slurry, such as a middle layer mixing treatment method, a deep layer mixing treatment method, a power blender method, a prefabricated pile embedding method, and a cast-in-place pile method. It can be preferably applied.
- the method selected from the middle layer mixing method, the deep layer mixing method, the power blender method and the existing pile embedding method from the viewpoint of suppressing the outflow of slurry to the surrounding ground of the excavated part. It can be used preferably.
- the intermediate layer mixed treatment method it is possible to prevent leakage of slurry having excavation lubrication and hardening action, and directly form a column-shaped soil improvement body in the ground.
- the leakage of slurry during soil excavation is prevented, and the leakage of foot protection liquid and pile circumference fixing liquid is prevented, and foundation piles can be formed in the ground.
- the ground improvement method of the present invention suppresses the outflow of the slurry supplied to the soil from the excavated part to the surrounding soil during soil excavation, it is possible to use the soil with many voids filled with air or moisture. Suitable.
- the density of the soil to be excavated is 0.4 g/cm 3 or more from the viewpoint of the soil being hard enough for a construction machine to enter, and the gaps are such that the outflow of the slurry becomes more pronounced.
- the density of the soil is 0.4 g/cm 3 or more, preferably 0.5 g/cm 3 or more, more preferably 0.6 g/cm 3 or more, still more preferably 1.5 g/cm 3 or more, and 2.5 g /cm 3 or less, preferably 2.3 g/cm 3 or less, more preferably 2.0 g/cm 3 or less.
- the density of soil is measured according to JIS A 1225 "Wet soil density test method". According to the ground improvement method of the present invention, specifically, it is possible to effectively excavate soil that has many structural gaps such as gravel and peat soil that contains a large amount of organic matter and water and from which slurry easily flows out. can be suppressed from flowing out of the liquid component from the excavated portion to the surrounding soil.
- the present invention uses water (W) and powder (P) as powder (P) in an excavating slurry containing water (W) and powder (P) at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less.
- a liquid leakage prevention material for excavation slurry that prevents slurry from flowing out to the ground around an excavation part, comprising component (A), wherein component (A) is 10% by mass with respect to powder (P)
- a leakage prevention material for drilling slurry hereinafter referred to as a leakage prevention material
- the leakage prevention material of the present invention may optionally contain component (B).
- the anti-leakage material of the present invention examples include an anti-leakage material containing the component (A) or an anti-leakage material containing the components (A) and (B).
- the blending amounts of the components (A) and (B) when preparing the leakage prevention material can be regarded as the respective contents in the powder (P) and the drilling slurry (hereinafter referred to as similar).
- Specific examples and preferred embodiments of the components (A), (B) and powder (P) in the leakage prevention material of the present invention are the same as those described in the ground improvement method of the present invention.
- the usage ratio of component (A) to (P), the preferred mass ratio (W)/(P) of water (W) and powder (P) in the excavation slurry, etc. are described in the slurry of the ground improvement method of the present invention. is the same as
- the soil to which the excavation slurry containing the leakage prevention material of the present invention is applied is effective for the soil described in the ground improvement method of the present invention, but the density of the target soil and the target ground are It is not limited to the above.
- the content of component (A) is preferably 30% by mass or more, more preferably 40% by mass or more, and still more preferably from the viewpoint of efficiently closing fine voids in the soil. 50% by mass or more, and from the viewpoint of wide application to various soils, it is preferably 100% by mass or less, more preferably 80% by mass or less, and even more preferably 70% by mass or less.
- the anti-leakage material of the present invention for example, the content of the component (A) is 100% by mass, that is, the anti-leakage material consisting of the (A) component can be used.
- the leakage prevention material of the present invention contains (A) component and optionally (B) component, and the total content of (A) component and (B) component in the leakage prevention material is From the viewpoint of efficiently blocking such voids, it is preferably 70% by mass or more, more preferably 75% by mass or more, still more preferably 80% by mass or more, still more preferably 85% by mass or more, and still more preferably 90% by mass or more. From the viewpoint of wide application to various soils, the content is 100% by mass or less, preferably 99% by mass or less, more preferably 98% by mass or less, and even more preferably 95% by mass or less.
- the anti-leakage material of the present invention for example, the total content of the components (A) and (B) is 100% by mass, that is, the anti-leakage material composed of the (A) component and the (B) component can be used. can.
- the mass ratio (B)/(A) of the content of the component (A) to the content of the component (B) is determined by various voids in the soil. From the viewpoint of efficiently blocking, it is preferably 0.4 or more, more preferably 0.6 or more, and still more preferably 1 or more, and from the viewpoint of efficiently blocking both large and fine voids in the soil, It is preferably 2.3 or less, more preferably 2 or less, and still more preferably 1.5 or less.
- the liquid leakage prevention material of the present invention includes conventional cement dispersants, water-soluble polymer compounds, air entraining agents, cement wetting agents, swelling agents, waterproofing agents, retardants, quick setting agents, thickeners, flocculating agents, drying Components such as shrinkage reducing agents, strength enhancers, curing accelerators and preservatives [excluding those corresponding to components (A) and (B)] may be included.
- the anti-leakage material of the present invention may be in either a liquid state in which the anti-leakage material is mixed with water or the like, or in a solid state such as powder, and is more preferably powder.
- the present invention contains water (W) and powder (P) at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less, and the powder (P) contains 10 % by mass or more.
- the drilling slurry of the present invention may optionally contain component (B).
- component (B) As the drilling slurry of the present invention, for example, a drilling slurry containing the leakage prevention material for drilling slurry of the present invention can be used.
- the excavating slurry of the present invention is useful in any field such as soil improvement, pile foundation construction, and tunnel construction.
- the excavation slurry of the present invention can be suitably used for construction methods such as intermediate layer mixing processing method, deep layer mixing processing method, power blender method, ready-made pile embedding method, and cast-in-place pile method.
- the excavation slurry of the present invention is more preferably used in a construction method selected from an intermediate layer mixing method, a deep layer mixing method, a power blender method, and a prefabricated pile embedding method.
- the excavation slurry of the present invention is used for excavating soil having a density of 0.4 g/cm 3 or more and 2.5 g/cm 3 or less from the viewpoint of suppressing the outflow of the slurry to the surrounding ground of the excavation part. preferably. That is, the present invention provides use of the excavating slurry of the present invention for excavating soil having a density of 0.4 g/cm 3 or more and 2.5 g/cm 3 or less.
- a method for producing a drilling slurry of the present invention includes a method for producing a drilling slurry in which the component (A), the powder (P) other than the component (A), and water are mixed.
- a method for producing the drilling slurry of the present invention there is a method for producing a drilling slurry in which the leakage prevention material for drilling slurry of the present invention and water are blended.
- the (A) component, an optional (B) component, and powder (P) other than the (A) component and the (B) component are mixed to obtain ( Examples include a method for producing a drilling slurry for producing a drilling slurry containing component A) and optional component (B).
- the water (W) and the powder (P) are mixed by any method as long as the performance of the components (A), (B) and the drilling slurry is not deteriorated. can be done.
- the BET specific surface area can be obtained directly by the BET flow method (single-point method/multi-point method) and a method based on "JISZ8830:2013 Method for measuring the specific surface area of powder (solid) by gas adsorption". It can be obtained indirectly from the relationship between the specific surface area and the BET specific surface area.
- the following linear approximation formula was derived based on the measured values of Blaine specific surface area and BET specific surface area of components (A1), (A2), and (B2) below.
- the BET specific surface area can be obtained from the Blaine specific surface area by this linear approximation.
- B1 Ordinary Portland cement (manufactured by Sumitomo Osaka Cement Co., Ltd.): BET specific surface area 0.72 m 2 /g (B2) Ground blast furnace slag (Nippon Steel Cement Co., Ltd. Spirits 4000): BET specific surface area 0.94 m 2 /g
- the BET specific surface areas of components (A) and (B) are based on the BET flow method (single-point method/multi-point method) and "JISZ8830:2013 Method for measuring the specific surface area of powder (solid) by gas adsorption". calculated by the method. Specifically, the BET specific surface area of each component was calculated using a fully automatic specific surface area measuring device "Macsorb” manufactured by MOUNTECH Co., LTD.
- Examples and Comparative Examples Drilling slurries having the compositions shown in Tables 1 to 3 were prepared, and the leakage prevention effect of the leakage prevention material for drilling slurry was evaluated based on the following slurry passage rate (%) and slurry passage rate (%). gone.
- the compounding ratio corresponds to the ratio (% by mass) of component (A) or component (B) in powder (P).
- Component (A1), component (A2), and component (B1) are added to water so that the mixing ratio shown in Tables 1 to 3 and the mass ratio (W)/(P) of water (W) and powder (P) are obtained.
- the component (B2) was blended and kneaded for 1 minute using a commercially available hand mixer to obtain a drilling slurry.
- the measurement was started when the cock was opened, and the mass (g) of the drilling slurry that flowed out from the cock was measured for 10 minutes from the measurement start time. Then, the ratio (% by mass) of the mass (g) of the drilling slurry flowing out of the cock in 10 minutes to the mass (g) of the drilling slurry added to the column is calculated, and this ratio is referred to as the slurry passage rate (%). did.
- the results are shown in Tables 1-3. The lower the slurry passage rate, the higher the leakage prevention effect of the excavation slurry by the leakage prevention material.
- the slurry of each example has a mass ratio (W)/(P) of water (W) and powder (P) that is suitable for drilling slurry (for example, funnel viscosity (500 ml/500 ml) is 180 seconds below), it has a high liquid leakage prevention effect, and the powder (P) used is also a component used as an excavating slurry, so it does not impair its function as an excavating slurry when excavating soil. can be used for
- FIG. 1 shows the relationship with the rate of slurry passing rate for 1 h.
- the leakage prevention material of the present invention has the same mass ratio (W) / (P) of water (W) and powder (P) However, it can be seen that the leakage of the liquid is effectively prevented by the influence of the component (A).
- the mass ratio (W)/(P) of water (W) and powder (P) is 100
- the compounding ratio of component (A) is 0 (comparative example 3-1a, reference value)
- the compounding ratio of component (A) was 10% by mass Example 3-1h
- the ratio of the slurry passage rate to the reference value was significantly reduced. Therefore, by using the excavation slurries of Examples 3-1a to 3-1h, it is considered that the outflow of the excavation slurry to the ground surrounding the excavation can be suppressed, and smooth construction can be performed during excavation.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Inorganic Chemistry (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
A site improvement method that excavates soil having a density of 0.4 g/cm3 to 2.5 g/cm3 (inclusive) using a slurry containing water (W) and a powder (P), wherein the powder (P) contains (A) an inorganic powder (referred to hereinafter as component (A)) having a BET specific surface area of 1.2 m2/g to 5 m2/g (inclusive), the proportion of component (A) in the powder (P) is 10 mass% or more, and the mass ratio (W)/(P) of the water (W) and powder (P) contained in the slurry is 70-150 mass% (inclusive).
Description
本発明は、地盤改良方法、掘削スラリー用逸液防止材、掘削スラリー、掘削スラリーの土壌の掘削への使用及び掘削スラリーの製造方法に関する。
The present invention relates to a ground improvement method, a leakage prevention material for drilling slurry, drilling slurry, use of drilling slurry for drilling soil, and a method for producing drilling slurry.
背景技術
建造物を建設する基礎を地盤改良する方法として、コンクリート製又は鋼管製の地盤改良コラムを地盤に打ち込む地盤改良方法や、地盤を掘削しながらセメントミルクなどのセメント系固化材を注入し、掘削土と前記セメントミルクなどのセメント系固化材とが混じり合って形成されるコラム状の地盤改良体を地盤中に直接形成する地盤改良方法が知られている。
また、基礎を地盤改良する方法の一つとして、地盤を掘削して縦穴を作製し、そこに鉄筋性の籠を挿入し、さらにコンクリートを注入することで地中にコンクリート杭を形成する場所打ち杭工法が知られている。
また、基礎杭を築造する基礎杭施工方法の一つに、プレボーリング根固め工法がある。これは、掘削液を注入しながら土壌をオーガで所定深度(支持層)まで掘削した後、根固め液を掘削先端部へ注入し、その後、オーガを引き上げながら杭周固定液を注入し、杭をこの掘削孔に建て込み、圧入又は軽打により根固め液中に定着させ、根固め液と杭周固定液の硬化によって杭と地盤を一体化させる方法である。 BACKGROUND ART As a method for improving the foundation for constructing a building, there is a method for improving the ground by driving a concrete or steel pipe soil improvement column into the ground, and a method for injecting a cement-based solidification material such as cement milk while excavating the ground. A soil improvement method is known in which a column-shaped soil improvement body formed by mixing excavated soil and a cement-based solidifying material such as cement milk is directly formed in the ground.
In addition, as one of the methods for improving the foundation, the ground is excavated to create a vertical hole, a reinforced cage is inserted into the hole, and concrete is injected to form a concrete pile in the ground. The piling method is known.
One of the foundation pile construction methods for building foundation piles is the pre-boring foot protection method. After excavating the soil with an auger to a predetermined depth (bearing layer) while injecting drilling fluid, foot protection fluid is injected into the tip of the excavation. is erected in this excavation hole, fixed in the foot protection liquid by press-fitting or tapping, and the pile and the ground are integrated by hardening the foot protection liquid and the pile circumference fixing liquid.
建造物を建設する基礎を地盤改良する方法として、コンクリート製又は鋼管製の地盤改良コラムを地盤に打ち込む地盤改良方法や、地盤を掘削しながらセメントミルクなどのセメント系固化材を注入し、掘削土と前記セメントミルクなどのセメント系固化材とが混じり合って形成されるコラム状の地盤改良体を地盤中に直接形成する地盤改良方法が知られている。
また、基礎を地盤改良する方法の一つとして、地盤を掘削して縦穴を作製し、そこに鉄筋性の籠を挿入し、さらにコンクリートを注入することで地中にコンクリート杭を形成する場所打ち杭工法が知られている。
また、基礎杭を築造する基礎杭施工方法の一つに、プレボーリング根固め工法がある。これは、掘削液を注入しながら土壌をオーガで所定深度(支持層)まで掘削した後、根固め液を掘削先端部へ注入し、その後、オーガを引き上げながら杭周固定液を注入し、杭をこの掘削孔に建て込み、圧入又は軽打により根固め液中に定着させ、根固め液と杭周固定液の硬化によって杭と地盤を一体化させる方法である。 BACKGROUND ART As a method for improving the foundation for constructing a building, there is a method for improving the ground by driving a concrete or steel pipe soil improvement column into the ground, and a method for injecting a cement-based solidification material such as cement milk while excavating the ground. A soil improvement method is known in which a column-shaped soil improvement body formed by mixing excavated soil and a cement-based solidifying material such as cement milk is directly formed in the ground.
In addition, as one of the methods for improving the foundation, the ground is excavated to create a vertical hole, a reinforced cage is inserted into the hole, and concrete is injected to form a concrete pile in the ground. The piling method is known.
One of the foundation pile construction methods for building foundation piles is the pre-boring foot protection method. After excavating the soil with an auger to a predetermined depth (bearing layer) while injecting drilling fluid, foot protection fluid is injected into the tip of the excavation. is erected in this excavation hole, fixed in the foot protection liquid by press-fitting or tapping, and the pile and the ground are integrated by hardening the foot protection liquid and the pile circumference fixing liquid.
特開2018-193515号公報には、有機質軟弱地盤を改良するための腐植土用固化材が、セメントと高炉スラグと無水石膏とを含むこと、この高炉スラグ微粉末のブレーン比表面積が8000cm2/g以上であること、が開示されている。
Japanese Patent Application Laid-Open No. 2018-193515 discloses that a humus soil solidification material for improving organic soft ground contains cement, blast furnace slag, and anhydrous gypsum, and that the Blaine specific surface area of this ground granulated blast furnace slag is 8000 cm 2 / is greater than or equal to g.
発明の概要
地盤改良方法が土壌の掘削を伴う場合、土壌掘削時等に、土壌に供給されたスラリー(例えば、セメントミルクなどの固化材や掘削液など)が周辺の地盤に流出すると、より多くのスラリーが必要となり、経済的にも掘削作業効率的にも好ましくない。また、スラリーを有効に機能させる観点から、スラリーが掘削部の周囲地盤へ流出することは好ましくない。上記の特開2018-193515号公報に開示された技術は、掘削部の周囲地盤へのスラリー流出を抑制することに対しては十分とはいえない。 Outline of the Invention When the ground improvement method involves excavating the soil, when the slurry supplied to the soil (for example, solidifying material such as cement milk, drilling fluid, etc.) flows into the surrounding ground during soil excavation, more of slurry is required, which is not preferable in terms of economy and excavation work efficiency. In addition, from the viewpoint of allowing the slurry to function effectively, it is not preferable for the slurry to flow out to the surrounding ground of the excavated portion. The technology disclosed in JP-A-2018-193515 cannot be said to be sufficient for suppressing the outflow of slurry to the surrounding ground of the excavation section.
地盤改良方法が土壌の掘削を伴う場合、土壌掘削時等に、土壌に供給されたスラリー(例えば、セメントミルクなどの固化材や掘削液など)が周辺の地盤に流出すると、より多くのスラリーが必要となり、経済的にも掘削作業効率的にも好ましくない。また、スラリーを有効に機能させる観点から、スラリーが掘削部の周囲地盤へ流出することは好ましくない。上記の特開2018-193515号公報に開示された技術は、掘削部の周囲地盤へのスラリー流出を抑制することに対しては十分とはいえない。 Outline of the Invention When the ground improvement method involves excavating the soil, when the slurry supplied to the soil (for example, solidifying material such as cement milk, drilling fluid, etc.) flows into the surrounding ground during soil excavation, more of slurry is required, which is not preferable in terms of economy and excavation work efficiency. In addition, from the viewpoint of allowing the slurry to function effectively, it is not preferable for the slurry to flow out to the surrounding ground of the excavated portion. The technology disclosed in JP-A-2018-193515 cannot be said to be sufficient for suppressing the outflow of slurry to the surrounding ground of the excavation section.
本発明は、土壌掘削時等に土壌に供給されたスラリーが掘削部の周囲地盤に流出することを抑制する地盤改良方法、掘削スラリー用逸液防止材、掘削スラリー、掘削スラリーの土壌の掘削への使用及び掘削スラリーの製造方法を提供する。
The present invention provides a ground improvement method for suppressing the outflow of slurry supplied to the soil during soil excavation or the like to the surrounding ground of the excavated part, a leakage prevention material for excavated slurry, an excavated slurry, and an excavated slurry for soil excavation. and a method for producing a drilling slurry.
本発明は、密度が0.4g/cm3以上2.5g/cm3以下の土壌を、水(W)と粉体(P)を含むスラリーを用いて掘削すること、を行う地盤改良方法であって、粉体(P)は、(A)BET比表面積が1.2m2/g以上5m2/g以下の無機粉体〔以下(A)成分という〕を含み、粉体(P)中、(A)成分の割合が10質量%以上であり、前記スラリーの水(W)と粉体(P)の質量比(W)/(P)が、70質量%以上150質量%以下である、地盤改良方法に関する。
The present invention is a ground improvement method for excavating soil having a density of 0.4 g / cm 3 or more and 2.5 g / cm 3 or less using a slurry containing water (W) and powder (P). The powder (P) contains (A) an inorganic powder having a BET specific surface area of 1.2 m 2 /g or more and 5 m 2 /g or less [hereinafter referred to as component (A)], , The ratio of component (A) is 10% by mass or more, and the mass ratio (W)/(P) of water (W) and powder (P) in the slurry is 70% by mass or more and 150% by mass or less. , relating to ground improvement methods.
また、本発明は、水(W)と粉体(P)を、70質量%以上150質量%以下の質量比(W)/(P)で含む掘削スラリーに粉体(P)として用いられ、当該掘削スラリーが掘削部の周囲の地盤に流出することを防止する掘削スラリー用逸液防止材であって、(A)成分を含み、(A)成分が、粉体(P)に対して10質量%以上の割合で用いられる、掘削スラリー用逸液防止材に関する。
In addition, the present invention uses water (W) and powder (P) as powder (P) in a drilling slurry containing water (W) and powder (P) at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less, A liquid leakage prevention material for excavation slurry that prevents the excavation slurry from flowing out to the ground around the excavation part, comprising the component (A), wherein the component (A) is 10% with respect to the powder (P) The present invention relates to a leakage prevention material for drilling slurry, which is used at a rate of mass % or more.
また、本発明は、水(W)と粉体(P)を、70質量%以上150質量%以下の質量比(W)/(P)で含み、粉体(P)は、(A)成分を10質量%以上含む、掘削スラリーに関する。
In addition, the present invention contains water (W) and powder (P) at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less, and the powder (P) is the component (A) It relates to a drilling slurry containing 10% by mass or more.
また、本発明は、上記の掘削スラリーの、密度が0.4g/cm3以上2.5g/cm3以下の土壌の掘削への使用に関する。
The present invention also relates to the use of the above excavation slurry for excavating soil having a density of 0.4 g/cm 3 or more and 2.5 g/cm 3 or less.
また、本発明は、水(W)と粉体(P)を、70質量%以上150質量%以下の質量比(W)/(P)で配合し、粉体(P)として、該粉体(P)に対して10質量%以上の割合で(A)成分を配合する、掘削スラリーの製造方法に関する。
Further, in the present invention, water (W) and powder (P) are blended at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less, and the powder (P) is The present invention relates to a method for producing a drilling slurry, in which component (A) is blended in a proportion of 10% by mass or more with respect to (P).
本発明によれば、土壌掘削時に土壌に供給されたスラリーが掘削部の周囲地盤に流出することを抑制する地盤改良方法、掘削スラリー用逸液防止材、掘削スラリー、掘削スラリーの土壌の掘削への使用及び掘削スラリーの製造方法が提供できる。
INDUSTRIAL APPLICABILITY According to the present invention, a ground improvement method for suppressing the outflow of slurry supplied to the soil during soil excavation to the surrounding ground of an excavation section, a liquid leakage prevention material for excavation slurry, an excavation slurry, and an excavation slurry for soil excavation and methods for producing drilling slurries.
発明を実施するための形態
本発明の地盤改良方法において、土壌に供給されたスラリーの流出が抑制される機構は定かではないが、スラリーに含まれる粉体(P)が、(A)BET比表面積が1.2m2/g以上5m2/g以下の無機粉体〔以下(A)成分という〕を含み、粉体(P)中、(A)成分の割合が10質量%以上であることで、この無機粉体が物理的に土壌の隙間を即座に封鎖してスラリーの逸液を抑制していると考えられる。特に、発明者らは、水に対して粉体(P)が少ない場合、スラリー中の粒子の運動性が高いことから、(A)成分が素早く移動し、効率的に土壌の隙間を封鎖できることから、(A)成分によるスラリーの逸液抑制効果が高くなることを見出した。そして、水に対して粉体(P)が少ない場合であっても、粉体(P)の量が所定の範囲を外れると、(A)成分を用いてもスラリーの逸液抑制効果が向上しないことを見出した。一方で、発明者らは、水に対して粉体(P)が多い場合、一般にスラリーの粘性が高く、内部の粒子の運動性が低いことから、(A)成分が効率的に土壌の隙間まで到達することができず(A)成分による逸液抑制効果が発現しにくいことを見出した。すなわち、空気又は水分で満たされた空隙の多い土壌に対して、粉体(P)中の特定比表面積の無機粉体(A)が土壌の隙間を封鎖し、水(W)と粉体(P)の質量比((W)/(P))が特定範囲で無機粉体(A)を効率的に土壌の隙間に到達させることができる。その結果として、スラリーの掘削部の周囲地盤への流出が抑制されると推察される。本発明は、これらの知見に基づいて完成されたものであり、所定の水(W)と粉体(P)の質量比(W)/(P)のスラリーを用いた場合において、スラリーの硬化を待つことなくスラリーの逸液が抑制されるので、掘削時におけるスムーズな施工が可能となる。
本発明の地盤改良方法、掘削スラリー用逸液防止材、掘削スラリーは、比較的水の多いスラリーの流出抑制に有効であり、スラリーの流出を抑制することで、スラリーを有効に機能させることができる。 Mode for carrying out the invention In the soil improvement method of the present invention, the mechanism by which the outflow of the slurry supplied to the soil is suppressed is not clear, but the powder (P) contained in the slurry is (A) BET ratio It contains an inorganic powder having a surface area of 1.2 m 2 /g or more and 5 m 2 /g or less [hereinafter referred to as component (A)], and the ratio of component (A) in powder (P) is 10% by mass or more. Therefore, it is considered that this inorganic powder immediately blocks the gaps in the soil physically and suppresses the leakage of the slurry. In particular, the inventors found that when the amount of powder (P) is small relative to water, the mobility of particles in the slurry is high, so the component (A) moves quickly and can efficiently block the gaps in the soil. Therefore, it was found that the effect of suppressing leakage of slurry by the component (A) is enhanced. Even when the powder (P) is less than the water, if the amount of the powder (P) is out of the predetermined range, the effect of suppressing leakage of the slurry is improved even if the component (A) is used. I found out not to. On the other hand, the inventors found that when there is a large amount of powder (P) relative to water, the viscosity of the slurry is generally high and the mobility of the particles inside is low, so the component (A) can efficiently fill the gaps in the soil. It was found that the liquid leakage suppressing effect of the component (A) was difficult to manifest. That is, for soil with many voids filled with air or moisture, the inorganic powder (A) with a specific specific surface area in the powder (P) blocks the gaps in the soil, and the water (W) and the powder ( When the mass ratio ((W)/(P)) of P) is within a specific range, the inorganic powder (A) can efficiently reach the crevices of the soil. As a result, it is presumed that the outflow of the slurry to the surrounding ground of the excavated portion is suppressed. The present invention was completed based on these findings, and when a slurry having a predetermined mass ratio (W)/(P) of water (W) and powder (P) is used, the hardening of the slurry Since the leakage of the slurry is suppressed without waiting for , it is possible to perform smooth construction during excavation.
The ground improvement method, leakage prevention material for drilling slurry, and drilling slurry of the present invention are effective in suppressing the outflow of slurry with a relatively large amount of water, and by suppressing the outflow of the slurry, the slurry can function effectively. can.
本発明の地盤改良方法において、土壌に供給されたスラリーの流出が抑制される機構は定かではないが、スラリーに含まれる粉体(P)が、(A)BET比表面積が1.2m2/g以上5m2/g以下の無機粉体〔以下(A)成分という〕を含み、粉体(P)中、(A)成分の割合が10質量%以上であることで、この無機粉体が物理的に土壌の隙間を即座に封鎖してスラリーの逸液を抑制していると考えられる。特に、発明者らは、水に対して粉体(P)が少ない場合、スラリー中の粒子の運動性が高いことから、(A)成分が素早く移動し、効率的に土壌の隙間を封鎖できることから、(A)成分によるスラリーの逸液抑制効果が高くなることを見出した。そして、水に対して粉体(P)が少ない場合であっても、粉体(P)の量が所定の範囲を外れると、(A)成分を用いてもスラリーの逸液抑制効果が向上しないことを見出した。一方で、発明者らは、水に対して粉体(P)が多い場合、一般にスラリーの粘性が高く、内部の粒子の運動性が低いことから、(A)成分が効率的に土壌の隙間まで到達することができず(A)成分による逸液抑制効果が発現しにくいことを見出した。すなわち、空気又は水分で満たされた空隙の多い土壌に対して、粉体(P)中の特定比表面積の無機粉体(A)が土壌の隙間を封鎖し、水(W)と粉体(P)の質量比((W)/(P))が特定範囲で無機粉体(A)を効率的に土壌の隙間に到達させることができる。その結果として、スラリーの掘削部の周囲地盤への流出が抑制されると推察される。本発明は、これらの知見に基づいて完成されたものであり、所定の水(W)と粉体(P)の質量比(W)/(P)のスラリーを用いた場合において、スラリーの硬化を待つことなくスラリーの逸液が抑制されるので、掘削時におけるスムーズな施工が可能となる。
本発明の地盤改良方法、掘削スラリー用逸液防止材、掘削スラリーは、比較的水の多いスラリーの流出抑制に有効であり、スラリーの流出を抑制することで、スラリーを有効に機能させることができる。 Mode for carrying out the invention In the soil improvement method of the present invention, the mechanism by which the outflow of the slurry supplied to the soil is suppressed is not clear, but the powder (P) contained in the slurry is (A) BET ratio It contains an inorganic powder having a surface area of 1.2 m 2 /g or more and 5 m 2 /g or less [hereinafter referred to as component (A)], and the ratio of component (A) in powder (P) is 10% by mass or more. Therefore, it is considered that this inorganic powder immediately blocks the gaps in the soil physically and suppresses the leakage of the slurry. In particular, the inventors found that when the amount of powder (P) is small relative to water, the mobility of particles in the slurry is high, so the component (A) moves quickly and can efficiently block the gaps in the soil. Therefore, it was found that the effect of suppressing leakage of slurry by the component (A) is enhanced. Even when the powder (P) is less than the water, if the amount of the powder (P) is out of the predetermined range, the effect of suppressing leakage of the slurry is improved even if the component (A) is used. I found out not to. On the other hand, the inventors found that when there is a large amount of powder (P) relative to water, the viscosity of the slurry is generally high and the mobility of the particles inside is low, so the component (A) can efficiently fill the gaps in the soil. It was found that the liquid leakage suppressing effect of the component (A) was difficult to manifest. That is, for soil with many voids filled with air or moisture, the inorganic powder (A) with a specific specific surface area in the powder (P) blocks the gaps in the soil, and the water (W) and the powder ( When the mass ratio ((W)/(P)) of P) is within a specific range, the inorganic powder (A) can efficiently reach the crevices of the soil. As a result, it is presumed that the outflow of the slurry to the surrounding ground of the excavated portion is suppressed. The present invention was completed based on these findings, and when a slurry having a predetermined mass ratio (W)/(P) of water (W) and powder (P) is used, the hardening of the slurry Since the leakage of the slurry is suppressed without waiting for , it is possible to perform smooth construction during excavation.
The ground improvement method, leakage prevention material for drilling slurry, and drilling slurry of the present invention are effective in suppressing the outflow of slurry with a relatively large amount of water, and by suppressing the outflow of the slurry, the slurry can function effectively. can.
<地盤改良方法>
本発明の地盤改良方法は、密度が0.4g/cm3以上2.5g/cm3以下の土壌を、水(W)と粉体(P)を含むスラリーを用いて掘削すること、を行う地盤改良方法であって、粉体(P)は、(A)成分を含み、粉体(P)中、(A)成分の割合が10質量%以上であり、前記スラリーの水(W)と粉体(P)の質量比(W)/(P)が、70質量%以上150質量%以下である。本発明の地盤改良方法に用いるスラリーとして、後に詳述する本発明の掘削スラリー用逸液防止材と水とを配合してなるスラリーが挙げられる。なお、本発明において質量比を「質量%」で表す場合、分母を100とした場合の分子の比率を意味する。 <Soil Improvement Method>
The ground improvement method of the present invention excavates soil having a density of 0.4 g / cm 3 or more and 2.5 g / cm 3 or less using a slurry containing water (W) and powder (P). In the ground improvement method, the powder (P) contains the (A) component, the proportion of the (A) component in the powder (P) is 10% by mass or more, and the water (W) of the slurry The mass ratio (W)/(P) of the powder (P) is 70% by mass or more and 150% by mass or less. Examples of the slurry used in the soil improvement method of the present invention include a slurry obtained by blending the leakage prevention material for excavation slurry of the present invention and water, which will be described in detail later. In the present invention, when the mass ratio is represented by "% by mass", it means the ratio of the numerator when the denominator is 100.
本発明の地盤改良方法は、密度が0.4g/cm3以上2.5g/cm3以下の土壌を、水(W)と粉体(P)を含むスラリーを用いて掘削すること、を行う地盤改良方法であって、粉体(P)は、(A)成分を含み、粉体(P)中、(A)成分の割合が10質量%以上であり、前記スラリーの水(W)と粉体(P)の質量比(W)/(P)が、70質量%以上150質量%以下である。本発明の地盤改良方法に用いるスラリーとして、後に詳述する本発明の掘削スラリー用逸液防止材と水とを配合してなるスラリーが挙げられる。なお、本発明において質量比を「質量%」で表す場合、分母を100とした場合の分子の比率を意味する。 <Soil Improvement Method>
The ground improvement method of the present invention excavates soil having a density of 0.4 g / cm 3 or more and 2.5 g / cm 3 or less using a slurry containing water (W) and powder (P). In the ground improvement method, the powder (P) contains the (A) component, the proportion of the (A) component in the powder (P) is 10% by mass or more, and the water (W) of the slurry The mass ratio (W)/(P) of the powder (P) is 70% by mass or more and 150% by mass or less. Examples of the slurry used in the soil improvement method of the present invention include a slurry obtained by blending the leakage prevention material for excavation slurry of the present invention and water, which will be described in detail later. In the present invention, when the mass ratio is represented by "% by mass", it means the ratio of the numerator when the denominator is 100.
水(W)は、清水や海水など、地盤改良の分野において使用される水が挙げられる。水(W)は、例えば、地下水、水道水、河川水、湖沼水、海水などが挙げられる。
Water (W) includes water used in the field of ground improvement, such as fresh water and seawater. Water (W) includes, for example, groundwater, tap water, river water, lake water, and seawater.
粉体(P)は、無機粉体が挙げられる。粉体(P)は、スラリー中に固体として存在する。粉体(P)は、土木一般で使用される無機粉体、例えば、後に詳細に説明する(A)成分で列挙された(1)~(4)の無機粉体が挙げられる。また、粉体(P)は、20℃の水100cm3に対する溶解度が、5以下の無機粉体が挙げられる。溶解度は、20℃の水100cm3に溶解し得る粉体(P)の質量(g)の最大値である。(A)成分の溶解度及び後述する(B)成分の溶解度も、粉体(P)の場合と同様の方法で求められる。
As for powder (P), an inorganic powder is mentioned. Powder (P) exists as a solid in the slurry. The powder (P) includes inorganic powders generally used in civil engineering, such as inorganic powders (1) to (4) enumerated for component (A), which will be described later in detail. The powder (P) is an inorganic powder having a solubility of 5 or less in 100 cm 3 of water at 20°C. The solubility is the maximum mass (g) of powder (P) that can be dissolved in 100 cm 3 of water at 20°C. The solubility of component (A) and the solubility of component (B), which will be described later, are also determined by the same method as for the powder (P).
粉体(P)は、(A)成分を含む。粉体(P)は、スラリーの逸液防止材として(A)成分を含む。(A)成分である無機粉体としては、特に限定されないが、以下の(1)~(4)の無機粉体から選択される1種以上の無機粉体を用いることができる。
(1)セメント、石膏などの水硬性粉体
(2)フライアッシュ、シリカフューム、火山灰、木質系バイオマス燃焼灰、けい酸白土などのポゾラン作用を持つ粉体
(3)石炭灰、高炉スラグ、けい藻土などの潜在水硬性粉体
(4)カオリン、ケイ酸アルミニウム、クレー、タルク、マイカ、ケイ酸カルシウム、セリサイト、ベントナイトなどのケイ酸塩 The powder (P) contains the (A) component. The powder (P) contains the component (A) as a slurry leakage prevention material. The inorganic powder as the component (A) is not particularly limited, but one or more inorganic powders selected from the following inorganic powders (1) to (4) can be used.
(1) Hydraulic powders such as cement and gypsum (2) Pozzolanic powders such as fly ash, silica fume, volcanic ash, woody biomass combustion ash, and silicate clay (3) Coal ash, blast furnace slag, diatoms Latent hydraulic powder such as soil (4) Silicate such as kaolin, aluminum silicate, clay, talc, mica, calcium silicate, sericite, and bentonite
(1)セメント、石膏などの水硬性粉体
(2)フライアッシュ、シリカフューム、火山灰、木質系バイオマス燃焼灰、けい酸白土などのポゾラン作用を持つ粉体
(3)石炭灰、高炉スラグ、けい藻土などの潜在水硬性粉体
(4)カオリン、ケイ酸アルミニウム、クレー、タルク、マイカ、ケイ酸カルシウム、セリサイト、ベントナイトなどのケイ酸塩 The powder (P) contains the (A) component. The powder (P) contains the component (A) as a slurry leakage prevention material. The inorganic powder as the component (A) is not particularly limited, but one or more inorganic powders selected from the following inorganic powders (1) to (4) can be used.
(1) Hydraulic powders such as cement and gypsum (2) Pozzolanic powders such as fly ash, silica fume, volcanic ash, woody biomass combustion ash, and silicate clay (3) Coal ash, blast furnace slag, diatoms Latent hydraulic powder such as soil (4) Silicate such as kaolin, aluminum silicate, clay, talc, mica, calcium silicate, sericite, and bentonite
(A)成分は、土壌への添加に対して安全でかつ工業的に安定して入手可能なものである観点から、前記(1)~(4)から選択される1種以上の無機粉体が好ましく、(3)石炭灰、高炉スラグ、けい藻土などの潜在水硬性粉体から選択される1種以上の無機粉体がより好ましく、高炉スラグがさらに好ましい。高炉スラグは、高炉水砕スラグ、高炉時徐冷スラグなどがある。
Component (A) is one or more inorganic powders selected from the above (1) to (4) from the viewpoint of being safe for addition to soil and being industrially stably available. (3) one or more inorganic powders selected from latent hydraulic powders such as coal ash, blast furnace slag, and diatomaceous earth are more preferred, and blast furnace slag is even more preferred. Blast furnace slag includes water granulated blast furnace slag, slow-cooled blast furnace slag, and the like.
(A)成分は、効率的に地盤の空隙を封鎖する観点から、BET比表面積が、1.2m2/g以上であり、好ましくは1.5m2/g以上、より好ましくは1.7m2/g以上、そして、スラリーの流出量抑制の観点から、5m2/g以下であり、好ましくは4.5m2/g以下、より好ましくは4m2/g以下、更に好ましくは2m2/g以下、より更に好ましくは1.8m2/g以下である。BET比表面積は、BET流動法(1点法/多点法)、「JISZ8830:2013 ガス吸着による粉体(固体)の比表面積測定方法」に基づいた方法により算出される。具体的には、BET比表面積は、MOUNTECH Co.,LTD製全自動比表面積測定装置「Macsorb」により算出される。(A)成分は、地盤の隙間を物理的に閉塞してスラリーの地盤への流出を抑制する観点から、スラリーの混錬からスラリーが地盤に注入されるまでの時間(例えば、最大1時間程度)、BET比表面積が大きく変化しないものが好ましい。
Component (A) has a BET specific surface area of 1.2 m 2 /g or more, preferably 1.5 m 2 /g or more, more preferably 1.7 m 2 , from the viewpoint of efficiently closing voids in the ground. /g or more, and from the viewpoint of suppressing the outflow of slurry, it is 5 m 2 /g or less, preferably 4.5 m 2 /g or less, more preferably 4 m 2 /g or less, further preferably 2 m 2 /g or less , and more preferably 1.8 m 2 /g or less. The BET specific surface area is calculated by a method based on the BET flow method (single-point method/multi-point method) and "JISZ8830:2013 Method for measuring specific surface area of powder (solid) by gas adsorption". Specifically, the BET specific surface area is calculated by a fully automatic specific surface area measuring device "Macsorb" manufactured by MOUNTECH Co., LTD. From the viewpoint of suppressing the outflow of the slurry into the ground by physically blocking the gaps in the ground, the component (A) is the time from slurry kneading until the slurry is injected into the ground (for example, up to about 1 hour ), and those in which the BET specific surface area does not change significantly are preferable.
(A)成分の20℃の水に対する溶解度は、土壌の間隙を効率的に封鎖する観点から、好ましくは5以下、より好ましくは3以下、更に好ましくは1以下である。
The solubility of component (A) in water at 20°C is preferably 5 or less, more preferably 3 or less, and still more preferably 1 or less, from the viewpoint of efficiently blocking soil pores.
(A)成分の平均粒子径は、スラリーが土壌に浸透することなく効率的に土壌の空隙を充填する観点から、好ましくは0.1μm以上、より好ましくは0.5μm以上、更に好ましくは1μm以上、そして、多数の粒子で緻密に土壌の空隙を充填する観点から、好ましくは100μm以下、より好ましくは70μm以下、更に好ましくは50μm以下である。(A)成分の平均粒子径は、HORIBA製 LA-920 レーザー回折/散乱式粒子径分布測定装置により算出される値である。なお、測定溶媒はエタノールである。
The average particle size of component (A) is preferably 0.1 μm or more, more preferably 0.5 μm or more, and even more preferably 1 μm or more, from the viewpoint of efficient filling of voids in the soil without the slurry penetrating into the soil. And, from the viewpoint of densely filling the voids of the soil with a large number of particles, the particle size is preferably 100 μm or less, more preferably 70 μm or less, and even more preferably 50 μm or less. The average particle size of component (A) is a value calculated using a HORIBA LA-920 laser diffraction/scattering particle size distribution analyzer. In addition, the measurement solvent is ethanol.
(A)成分として、例えば、粒度分布が正規分布の粉体を用いることができ、変動係数が50以下の粉体を用いることができる。
As the component (A), for example, a powder with a normal particle size distribution and a coefficient of variation of 50 or less can be used.
(A)成分は、非多孔質粉体であることが好ましい。ここでいう非多孔質粉体とは、粒子表面が平滑であり、空孔等の微細構造が無いものをいう。一例として、クリンカーを粉砕して得られるセメント、高炉スラグを粉砕して得られる高炉スラグ微粉末など、産業上数センチ以上の大粒径で得られる原料を粉砕し、粉末化して製品化されたものが該当する。
The component (A) is preferably non-porous powder. The term "non-porous powder" as used herein means a powder having a smooth particle surface and having no fine structure such as pores. For example, cement obtained by pulverizing clinker, ground granulated blast furnace slag obtained by pulverizing blast furnace slag, etc., are commercialized by pulverizing raw materials with large particle sizes of several centimeters or more industrially. thing applies.
粉体(P)は、(A)成分に加えて、任意に(B)BET比表面積が0.4m2/g以上1.0m2/g以下の無機粉体〔以下(B)成分という〕を含むことができる。
Powder (P) is, in addition to component (A), optionally (B) an inorganic powder having a BET specific surface area of 0.4 m 2 /g or more and 1.0 m 2 /g or less [hereinafter referred to as component (B)]. can include
(B)成分である無機粉体としては、特に限定されず上記の(A)成分で列挙された(1)~(4)の無機粉体から選択される1種以上の無機粉体を用いることができる。
The inorganic powder as the component (B) is not particularly limited, and one or more inorganic powders selected from the inorganic powders (1) to (4) listed for the component (A) above are used. be able to.
(B)成分は、土壌への添加に対して安全でかつ工業的に安定して入手可能なものである観点から、(1)セメント、石膏などの水硬性粉体、(2)フライアッシュ、シリカフューム、火山灰、木質系バイオマス燃焼灰、けい酸白土などのポゾラン作用を持つ粉体、(3)石炭灰、高炉スラグ、けい藻土などの潜在水硬性粉体、(4)カオリン、ケイ酸アルミニウム、クレー、タルク、マイカ、ケイ酸カルシウム、セリサイト、ベントナイトなどのケイ酸塩から選択される1種以上の無機粉体が好ましい。(B)成分は、汎用的に入手できる観点から、例えば、セメント、石膏などが好ましく、セメントがより好ましい。セメントは、普通ポルトランドセメント、高炉セメント、ビーライトセメント、中庸熱セメント、早強セメント、超早強セメント、耐硫酸塩セメントなどがある。
Component (B) is safe to be added to soil and is industrially stably available, so that (1) hydraulic powder such as cement and gypsum, (2) fly ash, Pozzolanic powders such as silica fume, volcanic ash, woody biomass combustion ash, silicate clay, etc. (3) Latent hydraulic powders such as coal ash, blast furnace slag, diatomaceous earth, etc. (4) Kaolin, aluminum silicate , clay, talc, mica, calcium silicate, sericite, bentonite and other silicates are preferred. Component (B) is preferably, for example, cement or gypsum, and more preferably cement, from the viewpoint of general availability. Cement includes ordinary portland cement, blast furnace cement, belite cement, moderate heat cement, high-early-strength cement, super-early-strength cement, sulfate-resistant cement, and the like.
(B)成分は、(A)成分との粉体混合性を確保する観点から、BET比表面積が、0.4m2/g以上であり、好ましくは0.5m2/g以上、より好ましくは0.6m2/g以上、そして、土壌の比較的大きい空隙を効率的に封鎖する観点から、1.0m2/g以下であり、好ましくは0.9m2/g以下、より好ましくは0.8m2/g以下である。BET比表面積は、BET流動法(1点法/多点法)、「JISZ8830:2013 ガス吸着による粉体(固体)の比表面積測定方法」に基づいた方法により算出される。具体的には、BET比表面積は、MOUNTECH Co.,LTD製全自動比表面積測定装置「Macsorb」により算出される。
Component (B) has a BET specific surface area of 0.4 m 2 /g or more, preferably 0.5 m 2 /g or more, more preferably 0.5 m 2 /g or more, from the viewpoint of ensuring powder mixability with component (A). 0.6 m 2 /g or more, and from the viewpoint of efficiently blocking relatively large voids in the soil, it is 1.0 m 2 /g or less, preferably 0.9 m 2 /g or less, more preferably 0.9 m 2 /g or less. 8 m 2 /g or less. The BET specific surface area is calculated by a method based on the BET flow method (single-point method/multi-point method) and "JISZ8830:2013 Method for measuring specific surface area of powder (solid) by gas adsorption". Specifically, the BET specific surface area is calculated by a fully automatic specific surface area measuring device "Macsorb" manufactured by MOUNTECH Co., LTD.
(B)成分の20℃の水に対する溶解度は、土壌の間隙を効率的に封鎖する観点から、好ましくは5以下、より好ましくは3以下、更に好ましくは1以下である。
The solubility of component (B) in water at 20°C is preferably 5 or less, more preferably 3 or less, and still more preferably 1 or less, from the viewpoint of efficiently closing the pores of the soil.
(B)成分として、例えば、粒度分布が正規分布の粉体を用いることができ、変動係数が50以下の粉体を用いることができる。
As component (B), for example, a powder with a normal distribution of particle sizes and a coefficient of variation of 50 or less can be used.
(B)成分は、非多孔質粉体であることが好ましい。ここでいう非多孔質粉体とは、粒子表面が平滑であり、空孔等の微細構造が無いものをいう。
The component (B) is preferably non-porous powder. The term "non-porous powder" as used herein means a powder having a smooth particle surface and having no fine structure such as pores.
スラリーは、水(W)と粉体(P)を含む。スラリー中、粉体(P)に対する水(W)の質量比(W)/(P)は、施工時のポンプ圧送性を確保し、かつスラリー中の粉体(A)の運動性を高める観点から、70質量%以上であり、好ましくは75質量%以上、より好ましくは80質量%以上、そして、スラリー注入に伴う施工時間、材料費等の経済的な観点から、より少ないスラリー調製量で逸液防止を行う必要があるため、150質量%以下であり、好ましくは140質量%以下、より好ましくは130質量%以下、更に好ましくは110質量%以下である。このスラリーの水(W)と粉体(P)の質量比(W)/(P)は、[〔スラリー中の水(W)の含有量(質量)〕/〔スラリー中の粉体(P)の含有量(質量)〕]×100で算出される。また、この質量比(W)/(P)は、水(W)と粉体(P)の配合量に基づいて算出できる。
The slurry contains water (W) and powder (P). In the slurry, the mass ratio (W)/(P) of water (W) to the powder (P) is from the viewpoint of ensuring pumpability during construction and increasing the mobility of the powder (A) in the slurry. Therefore, it is 70% by mass or more, preferably 75% by mass or more, more preferably 80% by mass or more, and from an economic point of view such as construction time and material costs associated with slurry injection, a smaller amount of slurry preparation is lost. Since liquid prevention is required, the content is 150% by mass or less, preferably 140% by mass or less, more preferably 130% by mass or less, and even more preferably 110% by mass or less. The mass ratio (W)/(P) of water (W) and powder (P) in this slurry is [[content (mass) of water (W) in slurry]/[powder (P ) content (mass)]]×100. Also, this mass ratio (W)/(P) can be calculated based on the blending amounts of water (W) and powder (P).
粉体(P)中、(A)成分の割合は、土壌の細かな空隙を効率的に封鎖する観点から、10質量%以上であり、好ましくは25質量%以上、より好ましくは30質量%以上、更に好ましくは40質量%以上、更に好ましくは50質量%以上、より更に好ましくは55質量%以上、そして、様々な土壌に広く適用する観点から、100質量%以下であり、好ましくは80質量%以下、より好ましくは70質量%以下である。粉体(P)として、例えば、粉体(P)中の(A)成分の割合が100質量%、すなわち、(A)成分からなる粉体を用いることができる。なお、本発明では、(A)成分や(B)成分等の配合量を、粉体(P)やスラリー中におけるそれぞれの含有量と見なすことができる(以下、同様である)。
The proportion of component (A) in the powder (P) is 10% by mass or more, preferably 25% by mass or more, more preferably 30% by mass or more, from the viewpoint of efficiently closing fine voids in the soil. , More preferably 40% by mass or more, more preferably 50% by mass or more, still more preferably 55% by mass or more, and from the viewpoint of wide application to various soils, 100% by mass or less, preferably 80% by mass 70% by mass or less, more preferably 70% by mass or less. As the powder (P), for example, the ratio of the component (A) in the powder (P) is 100% by mass, that is, the powder composed of the component (A) can be used. In the present invention, the amount of component (A), component (B), etc. can be regarded as the respective content in the powder (P) or slurry (the same applies hereinafter).
また、粉体(P)は、(A)成分と任意に(B)成分を含み、粉体(P)中、(A)成分と(B)成分の合計割合は、土壌の細かな空隙を効率的に封鎖する観点から、好ましくは70質量%以上、より好ましくは75質量%以上、更に好ましくは80質量%以上、更に好ましくは85質量%以上、更に好ましくは90質量%以上、そして、様々な土壌に広く適用する観点から、100質量%以下であり、好ましくは99質量%以下、より好ましくは98質量%以下、更に好ましくは95質量%以下である。粉体(P)として、例えば、粉体(P)中の(A)成分と(B)成分の合計割合が100質量%、すなわち、(A)成分と(B)成分からなる粉体を用いることができる。
In addition, the powder (P) contains the (A) component and optionally the (B) component, and the total ratio of the (A) component and the (B) component in the powder (P) is the fine voids in the soil. From the viewpoint of efficient blocking, preferably 70% by mass or more, more preferably 75% by mass or more, still more preferably 80% by mass or more, still more preferably 85% by mass or more, still more preferably 90% by mass or more, and various From the viewpoint of wide application to various soils, the content is 100% by mass or less, preferably 99% by mass or less, more preferably 98% by mass or less, and still more preferably 95% by mass or less. As the powder (P), for example, the total ratio of the components (A) and (B) in the powder (P) is 100% by mass, that is, powder composed of the components (A) and (B) is used. be able to.
スラリーが(B)成分を含む場合、(A)成分の含有量と(B)成分の含有量の質量比(B)/(A)は、土壌中の様々な空隙を効率的に封鎖する観点から、好ましくは0.4以上、より好ましくは0.6以上、更に好ましくは1以上、そして、土壌の大きい空隙と細かな空隙の両方を効率的に封鎖する観点から、好ましくは2.3以下、より好ましくは2以下、更に好ましくは1.5以下である。
When the slurry contains the component (B), the mass ratio (B)/(A) of the content of the component (A) and the content of the component (B) is from the viewpoint of efficiently closing various voids in the soil. Therefore, it is preferably 0.4 or more, more preferably 0.6 or more, still more preferably 1 or more, and preferably 2.3 or less from the viewpoint of efficiently closing both large and fine voids in the soil. , more preferably 2 or less, and still more preferably 1.5 or less.
スラリーは、逸液防止効果を確保する観点から、スラリー中の(A)成分の含有量が、好ましくは6質量%以上、より好ましくは12質量%以上、更に好ましくは17質量%以上、そして、好ましくは55質量%以下、より好ましくは50質量%以下、更に好ましくは44質量%以下である。
From the viewpoint of ensuring the effect of preventing leakage of liquid, the slurry preferably has a content of component (A) in the slurry of 6% by mass or more, more preferably 12% by mass or more, and still more preferably 17% by mass or more, and It is preferably 55% by mass or less, more preferably 50% by mass or less, and even more preferably 44% by mass or less.
スラリーが(A)成分と(B)成分を含む場合、スラリーは、逸液防止効果を確保する観点から、スラリー中の(A)成分と(B)成分の合計含有量が、好ましくは6質量%以上、より好ましくは12質量%以上、さらに好ましくは17質量%以上、そして、好ましくは55質量%以下、より好ましくは50質量%以下、更に好ましくは44質量%以下である。
When the slurry contains the (A) component and the (B) component, the total content of the (A) component and the (B) component in the slurry is preferably 6 mass from the viewpoint of ensuring the effect of preventing liquid loss. % or more, more preferably 12 mass % or more, still more preferably 17 mass % or more, and preferably 55 mass % or less, more preferably 50 mass % or less, still more preferably 44 mass % or less.
スラリーは、施工時のスラリーのポンプ圧送性の確保及びスラリーによる閉塞を避ける観点から、ファンネル粘性(500ml/500ml)が、好ましくは180秒以下、より好ましくは150秒以下、更に好ましくは120秒以下である。ここで、ファンネル粘性とは、500mlの漏斗形の容器に入れたスラリーが500ml吐出するに要した流出時間(秒)によって粘性を測定するマーシュファンネル粘度計を用いて測定された粘性である。ファンネル粘性は、例えば、マーシュファンネルビスコメーター(ファンネル)粘度計(型式:KS-192、メーカー:関西機器製作所、容量:500mL)を用いたスラリー全量(500mL)の流出時間によって測定できる。ファンネル粘性は、例えば、20℃における測定値である。また、スラリーは、施工時のスラリーのポンプ圧送性を確保する観点から流出時間は短いほど好ましい。
The slurry preferably has a funnel viscosity (500 ml/500 ml) of 180 seconds or less, more preferably 150 seconds or less, and even more preferably 120 seconds or less, from the viewpoint of ensuring the pumpability of the slurry during construction and avoiding clogging by the slurry. is. Here, the funnel viscosity is the viscosity measured using a Marsh funnel viscometer, which measures the viscosity based on the outflow time (seconds) required for discharging 500 ml of slurry placed in a 500 ml funnel-shaped container. The funnel viscosity can be measured by, for example, the outflow time of the total amount of slurry (500 mL) using a Marsh funnel viscometer (funnel) viscometer (model: KS-192, manufacturer: Kansai Kiki Seisakusho, capacity: 500 mL). Funnel viscosity is, for example, a value measured at 20°C. In addition, from the viewpoint of ensuring the pumpability of the slurry during construction, it is preferable that the outflow time of the slurry is as short as possible.
スラリーは、更にその他の成分も含むことができる。例えば、AE剤、遅延剤、起泡剤、増粘剤、発泡剤、防水剤、流動化剤、分散剤などが挙げられる。スラリーは、水に溶解する成分を含んでもよい。
The slurry can also contain other ingredients. Examples thereof include AE agents, retarders, foaming agents, thickeners, foaming agents, waterproofing agents, fluidizing agents, dispersing agents and the like. The slurry may contain components that dissolve in water.
スラリーとして、例えば、地盤掘削時に土壌に供給される掘削スラリーが挙げられ、より具体的には、土壌の掘削時に用いられるベントナイト泥水や、掘削された土壌と混合される固化材スラリー(例えば、セメントミルクなど)などが挙げられる。
Examples of the slurry include excavating slurry supplied to the soil during ground excavation. milk, etc.).
本発明の地盤改良方法として、例えば、スラリーを用いた土壌の掘削を伴う地盤改良方法が挙げられる。
Examples of ground improvement methods of the present invention include ground improvement methods involving soil excavation using slurry.
本発明の地盤改良方法は、中層混合処理工法、深層混合処理工法、パワーブレンダー工法、既製杭の埋め込み工法、場所打ち杭工法などの工法といった、スラリーを用いて土壌を掘削することを行う工法に好ましく適用できる。本発明の地盤改良方法は、スラリーが掘削部の周囲地盤に流出することを抑制できる観点から、中層混合処理工法、深層混合処理工法、パワーブレンダー工法及び既製杭の埋め込み工法から選ばれる工法において更に好適に用いることができる。
The ground improvement method of the present invention is a construction method for excavating soil using slurry, such as a middle layer mixing treatment method, a deep layer mixing treatment method, a power blender method, a prefabricated pile embedding method, and a cast-in-place pile method. It can be preferably applied. In the ground improvement method of the present invention, from the viewpoint of suppressing the outflow of slurry to the surrounding ground of the excavated part, the method selected from the middle layer mixing method, the deep layer mixing method, the power blender method and the existing pile embedding method. It can be used preferably.
例えば、中層混合処理工法の場合には、掘削潤滑及び硬化作用を有するスラリーの逸液を防止して、コラム状の地盤改良体を地盤中に直接形成できる。
また、例えば、既製杭の埋め込み工法の場合には、土壌掘削時のスラリーの逸液が防止され、根固め液及び杭周固定液の逸液を防止して、地盤に基礎杭を形成できる。 For example, in the case of the intermediate layer mixed treatment method, it is possible to prevent leakage of slurry having excavation lubrication and hardening action, and directly form a column-shaped soil improvement body in the ground.
In addition, for example, in the case of the method of embedding ready-made piles, the leakage of slurry during soil excavation is prevented, and the leakage of foot protection liquid and pile circumference fixing liquid is prevented, and foundation piles can be formed in the ground.
また、例えば、既製杭の埋め込み工法の場合には、土壌掘削時のスラリーの逸液が防止され、根固め液及び杭周固定液の逸液を防止して、地盤に基礎杭を形成できる。 For example, in the case of the intermediate layer mixed treatment method, it is possible to prevent leakage of slurry having excavation lubrication and hardening action, and directly form a column-shaped soil improvement body in the ground.
In addition, for example, in the case of the method of embedding ready-made piles, the leakage of slurry during soil excavation is prevented, and the leakage of foot protection liquid and pile circumference fixing liquid is prevented, and foundation piles can be formed in the ground.
本発明の地盤改良方法は、土壌掘削中に、土壌に供給されたスラリーが掘削部から周囲の土壌に流出することを抑制するものであるから、空気又は水分で満たされた空隙の多い土壌に適する。施工機械が進入できる程度の硬さを持った土壌としての観点から、掘削対象とする土壌の密度は、0.4g/cm3以上であり、そして、スラリーの流出がより顕著となる程度の空隙が存在する土壌である観点から、2.5g/cm3以下である。土壌の密度は、0.4g/cm3以上、好ましくは0.5g/cm3以上、より好ましくは0.6g/cm3以上、更に好ましくは1.5g/cm3以上、そして、2.5g/cm3以下、好ましくは2.3g/cm3以下、より好ましくは2.0g/cm3以下である。土壌の密度は、JIS A 1225「土の湿潤密度試験方法」により測定される。本発明の地盤改良方法によれば、具体的に、砂礫や、有機物と水分を多量に含む泥炭土壌といった、構造的に隙間が多く、スラリーが流出しやすい土壌の掘削でも有効にスラリー又はスラリー中の液体成分が掘削部から周囲の土壌に流出することを抑制できる。
Since the ground improvement method of the present invention suppresses the outflow of the slurry supplied to the soil from the excavated part to the surrounding soil during soil excavation, it is possible to use the soil with many voids filled with air or moisture. Suitable. The density of the soil to be excavated is 0.4 g/cm 3 or more from the viewpoint of the soil being hard enough for a construction machine to enter, and the gaps are such that the outflow of the slurry becomes more pronounced. is 2.5 g/cm 3 or less from the viewpoint that the soil contains The density of the soil is 0.4 g/cm 3 or more, preferably 0.5 g/cm 3 or more, more preferably 0.6 g/cm 3 or more, still more preferably 1.5 g/cm 3 or more, and 2.5 g /cm 3 or less, preferably 2.3 g/cm 3 or less, more preferably 2.0 g/cm 3 or less. The density of soil is measured according to JIS A 1225 "Wet soil density test method". According to the ground improvement method of the present invention, specifically, it is possible to effectively excavate soil that has many structural gaps such as gravel and peat soil that contains a large amount of organic matter and water and from which slurry easily flows out. can be suppressed from flowing out of the liquid component from the excavated portion to the surrounding soil.
<掘削スラリー用逸液防止材>
本発明は、水(W)と粉体(P)を、70質量%以上150質量%以下の質量比(W)/(P)で含む掘削スラリーに粉体(P)として用いられ、当該掘削スラリーが掘削部の周囲の地盤に流出することを防止する掘削スラリー用逸液防止材であって、(A)成分を含み、(A)成分が、粉体(P)に対して10質量%以上の割合で用いられる、掘削スラリー用逸液防止材(以下、逸液防止材という)を提供する。
本発明の逸液防止材は、任意に(B)成分を含んでもよい。また、本発明の逸液防止材として、例えば、(A)成分を配合した逸液防止材又は(A)成分と(B)成分を配合した逸液防止材が挙げられる。本発明では、逸液防止材を調製する際の(A)成分及び(B)成分等の配合量を、粉体(P)や掘削スラリー中におけるそれぞれの含有量と見なすことができる(以下、同様である)。 <Drain prevention material for drilling slurry>
The present invention uses water (W) and powder (P) as powder (P) in an excavating slurry containing water (W) and powder (P) at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less. A liquid leakage prevention material for excavation slurry that prevents slurry from flowing out to the ground around an excavation part, comprising component (A), wherein component (A) is 10% by mass with respect to powder (P) Provided is a leakage prevention material for drilling slurry (hereinafter referred to as a leakage prevention material) that is used at the above ratio.
The leakage prevention material of the present invention may optionally contain component (B). Examples of the anti-leakage material of the present invention include an anti-leakage material containing the component (A) or an anti-leakage material containing the components (A) and (B). In the present invention, the blending amounts of the components (A) and (B) when preparing the leakage prevention material can be regarded as the respective contents in the powder (P) and the drilling slurry (hereinafter referred to as similar).
本発明は、水(W)と粉体(P)を、70質量%以上150質量%以下の質量比(W)/(P)で含む掘削スラリーに粉体(P)として用いられ、当該掘削スラリーが掘削部の周囲の地盤に流出することを防止する掘削スラリー用逸液防止材であって、(A)成分を含み、(A)成分が、粉体(P)に対して10質量%以上の割合で用いられる、掘削スラリー用逸液防止材(以下、逸液防止材という)を提供する。
本発明の逸液防止材は、任意に(B)成分を含んでもよい。また、本発明の逸液防止材として、例えば、(A)成分を配合した逸液防止材又は(A)成分と(B)成分を配合した逸液防止材が挙げられる。本発明では、逸液防止材を調製する際の(A)成分及び(B)成分等の配合量を、粉体(P)や掘削スラリー中におけるそれぞれの含有量と見なすことができる(以下、同様である)。 <Drain prevention material for drilling slurry>
The present invention uses water (W) and powder (P) as powder (P) in an excavating slurry containing water (W) and powder (P) at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less. A liquid leakage prevention material for excavation slurry that prevents slurry from flowing out to the ground around an excavation part, comprising component (A), wherein component (A) is 10% by mass with respect to powder (P) Provided is a leakage prevention material for drilling slurry (hereinafter referred to as a leakage prevention material) that is used at the above ratio.
The leakage prevention material of the present invention may optionally contain component (B). Examples of the anti-leakage material of the present invention include an anti-leakage material containing the component (A) or an anti-leakage material containing the components (A) and (B). In the present invention, the blending amounts of the components (A) and (B) when preparing the leakage prevention material can be regarded as the respective contents in the powder (P) and the drilling slurry (hereinafter referred to as similar).
本発明の逸液防止材における、(A)成分、(B)成分及び粉体(P)等の具体例、好ましい態様は、本発明の地盤改良方法で述べたものと同じであり、粉体(P)に対する(A)成分の使用割合、掘削スラリーの好ましい水(W)と粉体(P)の質量比(W)/(P)等は、本発明の地盤改良方法のスラリーで述べたものと同じである。なお、本発明の逸液防止材を含んだ掘削スラリーが適用される土壌は、本発明の地盤改良方法で述べた土壌に対して有効であるが、対象とする土壌の密度や対象地盤は、上記のものに限定されるものではない。
Specific examples and preferred embodiments of the components (A), (B) and powder (P) in the leakage prevention material of the present invention are the same as those described in the ground improvement method of the present invention. The usage ratio of component (A) to (P), the preferred mass ratio (W)/(P) of water (W) and powder (P) in the excavation slurry, etc. are described in the slurry of the ground improvement method of the present invention. is the same as The soil to which the excavation slurry containing the leakage prevention material of the present invention is applied is effective for the soil described in the ground improvement method of the present invention, but the density of the target soil and the target ground are It is not limited to the above.
本発明の逸液防止材中、(A)成分の含有量は、土壌の細かな空隙を効率的に封鎖する観点から、好ましくは30質量%以上、より好ましくは40質量%以上、更に好ましくは50質量%以上、そして、様々な土壌に広く適用する観点から、好ましくは100質量%以下、より好ましくは80質量%以下、更に好ましくは70質量%以下である。本発明の逸液防止材として、例えば、(A)成分の含有量が100質量%、すなわち、(A)成分からなる逸液防止材を用いることができる。
In the leakage prevention material of the present invention, the content of component (A) is preferably 30% by mass or more, more preferably 40% by mass or more, and still more preferably from the viewpoint of efficiently closing fine voids in the soil. 50% by mass or more, and from the viewpoint of wide application to various soils, it is preferably 100% by mass or less, more preferably 80% by mass or less, and even more preferably 70% by mass or less. As the anti-leakage material of the present invention, for example, the content of the component (A) is 100% by mass, that is, the anti-leakage material consisting of the (A) component can be used.
また、本発明の逸液防止材は、(A)成分と任意に(B)成分を含み、該逸液防止材中、(A)成分と(B)成分の合計含有量は、土壌の細かな空隙を効率的に封鎖する観点から、好ましくは70質量%以上、より好ましくは75質量%以上、更に好ましくは80質量%以上、更に好ましくは85質量%以上、更に好ましくは90質量%以上、そして、様々な土壌に広く適用する観点から、100質量%以下であり、好ましくは99質量%以下、より好ましくは98質量%以下、更に好ましくは95質量%以下である。本発明の逸液防止材として、例えば、(A)成分と(B)成分の合計含有量が100質量%、すなわち、(A)成分と(B)成分からなる逸液防止材を用いることができる。
Further, the leakage prevention material of the present invention contains (A) component and optionally (B) component, and the total content of (A) component and (B) component in the leakage prevention material is From the viewpoint of efficiently blocking such voids, it is preferably 70% by mass or more, more preferably 75% by mass or more, still more preferably 80% by mass or more, still more preferably 85% by mass or more, and still more preferably 90% by mass or more. From the viewpoint of wide application to various soils, the content is 100% by mass or less, preferably 99% by mass or less, more preferably 98% by mass or less, and even more preferably 95% by mass or less. As the anti-leakage material of the present invention, for example, the total content of the components (A) and (B) is 100% by mass, that is, the anti-leakage material composed of the (A) component and the (B) component can be used. can.
本発明の逸液防止材が(B)成分を含む場合、(A)成分の含有量と(B)成分の含有量の質量比(B)/(A)は、土壌中の様々な空隙を効率的に封鎖する観点から、好ましくは0.4以上、より好ましくは0.6以上、更に好ましくは1以上、そして、土壌の大きい空隙と細かな空隙の両方を効率的に封鎖する観点から、好ましくは2.3以下、より好ましくは2以下、更に好ましくは1.5以下である。
When the leakage prevention material of the present invention contains the component (B), the mass ratio (B)/(A) of the content of the component (A) to the content of the component (B) is determined by various voids in the soil. From the viewpoint of efficiently blocking, it is preferably 0.4 or more, more preferably 0.6 or more, and still more preferably 1 or more, and from the viewpoint of efficiently blocking both large and fine voids in the soil, It is preferably 2.3 or less, more preferably 2 or less, and still more preferably 1.5 or less.
本発明の逸液防止材は、従来のセメント分散剤、水溶性高分子化合物、空気連行剤、セメント湿潤剤、膨張材、防水剤、遅延剤、急結剤、増粘剤、凝集剤、乾燥収縮低減剤、強度増進剤、硬化促進剤、防腐剤などの成分〔(A)成分及び(B)成分に該当するものを除く〕を含むことができる。
The liquid leakage prevention material of the present invention includes conventional cement dispersants, water-soluble polymer compounds, air entraining agents, cement wetting agents, swelling agents, waterproofing agents, retardants, quick setting agents, thickeners, flocculating agents, drying Components such as shrinkage reducing agents, strength enhancers, curing accelerators and preservatives [excluding those corresponding to components (A) and (B)] may be included.
本発明の逸液防止材は、水等に逸液防止材を混合した液体の状態、粉体などの固体の状態のいずれでもよく、粉体がより好ましい。
The anti-leakage material of the present invention may be in either a liquid state in which the anti-leakage material is mixed with water or the like, or in a solid state such as powder, and is more preferably powder.
<掘削スラリー>
本発明は、水(W)と粉体(P)を、70質量%以上150質量%以下の質量比(W)/(P)で含み、粉体(P)は、(A)成分を10質量%以上含む、掘削スラリーを提供する。
本発明の掘削スラリーは、任意に(B)成分を含んでもよい。また、本発明の掘削スラリーとして、例えば、本発明の掘削スラリー用逸液防止材を配合してなる掘削スラリーを用いることができる。 <Drilling slurry>
The present invention contains water (W) and powder (P) at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less, and the powder (P) contains 10 % by mass or more.
The drilling slurry of the present invention may optionally contain component (B). As the drilling slurry of the present invention, for example, a drilling slurry containing the leakage prevention material for drilling slurry of the present invention can be used.
本発明は、水(W)と粉体(P)を、70質量%以上150質量%以下の質量比(W)/(P)で含み、粉体(P)は、(A)成分を10質量%以上含む、掘削スラリーを提供する。
本発明の掘削スラリーは、任意に(B)成分を含んでもよい。また、本発明の掘削スラリーとして、例えば、本発明の掘削スラリー用逸液防止材を配合してなる掘削スラリーを用いることができる。 <Drilling slurry>
The present invention contains water (W) and powder (P) at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less, and the powder (P) contains 10 % by mass or more.
The drilling slurry of the present invention may optionally contain component (B). As the drilling slurry of the present invention, for example, a drilling slurry containing the leakage prevention material for drilling slurry of the present invention can be used.
本発明の掘削スラリーにおける(A)成分、(B)成分及び粉体(P)等の具体例、好ましい態様は、本発明の地盤改良方法で述べたものと同じであり、掘削スラリーの好ましい水(W)と粉体(P)の質量比(W)/(P)や粘度等は、本発明の地盤改良方法のスラリーで述べたものと同じである。
Specific examples and preferred embodiments of the (A) component, (B) component and powder (P) in the drilling slurry of the present invention are the same as those described in the ground improvement method of the present invention, and the preferred water of the drilling slurry The mass ratio (W)/(P) and viscosity of (W) and powder (P) are the same as those described for the slurry of the ground improvement method of the present invention.
本発明の掘削スラリーは、地盤改良用、杭基礎工事用、トンネル工事用などのいずれの分野においても有用である。本発明の掘削スラリーは、中層混合処理工法、深層混合処理工法、パワーブレンダー工法、既製杭の埋め込み工法、場所打ち杭工法といった工法に好適に用いることができる。本発明の掘削スラリーは、ペーストを注入する観点から、中層混合処理工法、深層混合処理工法、パワーブレンダー工法及び既製杭の埋め込み工法から選ばれる工法において更に好適に用いることができる。
また、本発明の掘削スラリーは、スラリーが掘削部の周囲地盤に流出することを抑制できる観点から、密度が0.4g/cm3以上2.5g/cm3以下の土壌の掘削に対して使用することが好ましい。
すなわち、本発明は、上記本発明の掘削スラリーの、密度が0.4g/cm3以上2.5g/cm3以下の土壌の掘削への使用を提供する。 The excavating slurry of the present invention is useful in any field such as soil improvement, pile foundation construction, and tunnel construction. The excavation slurry of the present invention can be suitably used for construction methods such as intermediate layer mixing processing method, deep layer mixing processing method, power blender method, ready-made pile embedding method, and cast-in-place pile method. From the viewpoint of injecting the paste, the excavation slurry of the present invention is more preferably used in a construction method selected from an intermediate layer mixing method, a deep layer mixing method, a power blender method, and a prefabricated pile embedding method.
In addition, the excavation slurry of the present invention is used for excavating soil having a density of 0.4 g/cm 3 or more and 2.5 g/cm 3 or less from the viewpoint of suppressing the outflow of the slurry to the surrounding ground of the excavation part. preferably.
That is, the present invention provides use of the excavating slurry of the present invention for excavating soil having a density of 0.4 g/cm 3 or more and 2.5 g/cm 3 or less.
また、本発明の掘削スラリーは、スラリーが掘削部の周囲地盤に流出することを抑制できる観点から、密度が0.4g/cm3以上2.5g/cm3以下の土壌の掘削に対して使用することが好ましい。
すなわち、本発明は、上記本発明の掘削スラリーの、密度が0.4g/cm3以上2.5g/cm3以下の土壌の掘削への使用を提供する。 The excavating slurry of the present invention is useful in any field such as soil improvement, pile foundation construction, and tunnel construction. The excavation slurry of the present invention can be suitably used for construction methods such as intermediate layer mixing processing method, deep layer mixing processing method, power blender method, ready-made pile embedding method, and cast-in-place pile method. From the viewpoint of injecting the paste, the excavation slurry of the present invention is more preferably used in a construction method selected from an intermediate layer mixing method, a deep layer mixing method, a power blender method, and a prefabricated pile embedding method.
In addition, the excavation slurry of the present invention is used for excavating soil having a density of 0.4 g/cm 3 or more and 2.5 g/cm 3 or less from the viewpoint of suppressing the outflow of the slurry to the surrounding ground of the excavation part. preferably.
That is, the present invention provides use of the excavating slurry of the present invention for excavating soil having a density of 0.4 g/cm 3 or more and 2.5 g/cm 3 or less.
〔掘削スラリーの製造方法〕
本発明は、水(W)と粉体(P)を、70質量%以上150質量%以下の質量比(W)/(P)で配合し、粉体(P)として、該粉体(P)に対して10質量%以上の割合で(A)成分を配合する、掘削スラリーの製造方法を提供する。
本発明の掘削スラリーの製造方法として、(A)成分と(A)成分以外の粉体(P)と水を混合する掘削スラリーの製造方法が挙げられる。本発明の掘削スラリーの製造方法として、本発明の掘削スラリー用逸液防止材と水を配合する、掘削スラリーの製造方法が挙げられる。 [Method for producing drilling slurry]
In the present invention, water (W) and powder (P) are blended at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less, and the powder (P) is Provided is a method for producing a drilling slurry in which the component (A) is blended at a rate of 10% by mass or more with respect to ).
A method for producing a drilling slurry of the present invention includes a method for producing a drilling slurry in which the component (A), the powder (P) other than the component (A), and water are mixed. As a method for producing the drilling slurry of the present invention, there is a method for producing a drilling slurry in which the leakage prevention material for drilling slurry of the present invention and water are blended.
本発明は、水(W)と粉体(P)を、70質量%以上150質量%以下の質量比(W)/(P)で配合し、粉体(P)として、該粉体(P)に対して10質量%以上の割合で(A)成分を配合する、掘削スラリーの製造方法を提供する。
本発明の掘削スラリーの製造方法として、(A)成分と(A)成分以外の粉体(P)と水を混合する掘削スラリーの製造方法が挙げられる。本発明の掘削スラリーの製造方法として、本発明の掘削スラリー用逸液防止材と水を配合する、掘削スラリーの製造方法が挙げられる。 [Method for producing drilling slurry]
In the present invention, water (W) and powder (P) are blended at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less, and the powder (P) is Provided is a method for producing a drilling slurry in which the component (A) is blended at a rate of 10% by mass or more with respect to ).
A method for producing a drilling slurry of the present invention includes a method for producing a drilling slurry in which the component (A), the powder (P) other than the component (A), and water are mixed. As a method for producing the drilling slurry of the present invention, there is a method for producing a drilling slurry in which the leakage prevention material for drilling slurry of the present invention and water are blended.
本発明の掘削スラリーの製造方法に用いられる(A)成分、(B)成分、粉体(P)等の具体例、好ましい態様は、本発明の地盤改良方法で述べたものと同じであり、掘削スラリーの好ましい水(W)と粉体(P)の質量比(W)/(P)や粘度等は、本発明の地盤改良方法のスラリーで述べたものと同じである。本発明の地盤改良方法のスラリーで述べた好ましい含有量は、本発明の掘削スラリーの製造方法の好ましい配合量である。更に、本発明の掘削スラリーの製造方法として、例えば、(A)成分と任意の(B)成分と、(A)成分及び(B)成分以外の粉体(P)とを混合して、(A)成分と任意の(B)成分とを含む掘削スラリーを製造する掘削スラリーの製造方法が挙げられる。
Specific examples and preferred embodiments of the (A) component, (B) component, powder (P), etc. used in the method for producing the excavating slurry of the present invention are the same as those described in the ground improvement method of the present invention, The preferred mass ratio (W)/(P) of water (W) and powder (P) and the viscosity of the excavating slurry are the same as those described for the slurry of the ground improvement method of the present invention. The preferred content mentioned in the slurry of the ground improvement method of the present invention is the preferred compounding amount of the method for producing the drilling slurry of the present invention. Furthermore, as a method for producing the drilling slurry of the present invention, for example, the (A) component, an optional (B) component, and powder (P) other than the (A) component and the (B) component are mixed to obtain ( Examples include a method for producing a drilling slurry for producing a drilling slurry containing component A) and optional component (B).
本発明の掘削スラリーの製造方法では、水(W)と粉体(P)との混合は、(A)成分、(B)成分及び掘削スラリーの性能を低下させない範囲で任意の方法で行うことができる。
In the method for producing the drilling slurry of the present invention, the water (W) and the powder (P) are mixed by any method as long as the performance of the components (A), (B) and the drilling slurry is not deteriorated. can be done.
実施例
実施例又は比較例で用いた成分を以下に示す。
・(A)成分
(A1)高炉スラグ微粉末(日鉄セメント株式会社製 スピリッツ8000):BET比表面積1.78m2/g
(A2)高炉スラグ微粉末(日鉄セメント株式会社製 スピリッツ6000):BET比表面積1.25m2/g Examples Components used in Examples or Comparative Examples are shown below.
- (A) component (A1) ground blast furnace slag (Nippon Steel Cement Co., Ltd. Spirits 8000): BET specific surface area 1.78 m 2 /g
(A2) Ground blast furnace slag (Nippon Steel Cement Co., Ltd. Spirits 6000): BET specific surface area 1.25 m 2 /g
実施例又は比較例で用いた成分を以下に示す。
・(A)成分
(A1)高炉スラグ微粉末(日鉄セメント株式会社製 スピリッツ8000):BET比表面積1.78m2/g
(A2)高炉スラグ微粉末(日鉄セメント株式会社製 スピリッツ6000):BET比表面積1.25m2/g Examples Components used in Examples or Comparative Examples are shown below.
- (A) component (A1) ground blast furnace slag (Nippon Steel Cement Co., Ltd. Spirits 8000): BET specific surface area 1.78 m 2 /g
(A2) Ground blast furnace slag (Nippon Steel Cement Co., Ltd. Spirits 6000): BET specific surface area 1.25 m 2 /g
なお、BET比表面積はBET流動法(1点法/多点法)、「JISZ8830:2013 ガス吸着による粉体(固体)の比表面積測定方法」に基づいた方法によって直接求めることができるが、ブレーン比表面積とBET比表面積の関係から間接的に求めることができる。一例として、高炉スラグ微粉末では、(A1)、(A2)及び下記の(B2)成分のブレーン比表面積とBET比表面積の値の測定値に基づいて、以下のような線形近似式を導出し、この線形近似式によりブレーン比表面積からBET比表面積を求めることができる。
・スピリッツ4000:ブレーン比表面積=4000cm2/g、BET比表面積=0.94m2/g
・スピリッツ6000:ブレーン比表面積=6000cm2/g、BET比表面積=1.25m2/g
・スピリッツ8000:ブレーン比表面積=8000cm2/g、BET比表面積=1.78m2/g
ブレーン比表面積(cm2/g)=4593.8×BET比表面積(m2/g)-94.4 The BET specific surface area can be obtained directly by the BET flow method (single-point method/multi-point method) and a method based on "JISZ8830:2013 Method for measuring the specific surface area of powder (solid) by gas adsorption". It can be obtained indirectly from the relationship between the specific surface area and the BET specific surface area. As an example, for ground granulated blast furnace slag, the following linear approximation formula was derived based on the measured values of Blaine specific surface area and BET specific surface area of components (A1), (A2), and (B2) below. , the BET specific surface area can be obtained from the Blaine specific surface area by this linear approximation.
・ Spirits 4000: Blaine specific surface area = 4000 cm 2 /g, BET specific surface area = 0.94 m 2 /g
・ Spirits 6000: Blaine specific surface area = 6000 cm 2 /g, BET specific surface area = 1.25 m 2 /g
・ Spirits 8000: Blaine specific surface area = 8000 cm 2 /g, BET specific surface area = 1.78 m 2 /g
Blaine specific surface area (cm 2 /g) = 4593.8 x BET specific surface area (m 2 /g) - 94.4
・スピリッツ4000:ブレーン比表面積=4000cm2/g、BET比表面積=0.94m2/g
・スピリッツ6000:ブレーン比表面積=6000cm2/g、BET比表面積=1.25m2/g
・スピリッツ8000:ブレーン比表面積=8000cm2/g、BET比表面積=1.78m2/g
ブレーン比表面積(cm2/g)=4593.8×BET比表面積(m2/g)-94.4 The BET specific surface area can be obtained directly by the BET flow method (single-point method/multi-point method) and a method based on "JISZ8830:2013 Method for measuring the specific surface area of powder (solid) by gas adsorption". It can be obtained indirectly from the relationship between the specific surface area and the BET specific surface area. As an example, for ground granulated blast furnace slag, the following linear approximation formula was derived based on the measured values of Blaine specific surface area and BET specific surface area of components (A1), (A2), and (B2) below. , the BET specific surface area can be obtained from the Blaine specific surface area by this linear approximation.
・ Spirits 4000: Blaine specific surface area = 4000 cm 2 /g, BET specific surface area = 0.94 m 2 /g
・ Spirits 6000: Blaine specific surface area = 6000 cm 2 /g, BET specific surface area = 1.25 m 2 /g
・ Spirits 8000: Blaine specific surface area = 8000 cm 2 /g, BET specific surface area = 1.78 m 2 /g
Blaine specific surface area (cm 2 /g) = 4593.8 x BET specific surface area (m 2 /g) - 94.4
・(B)成分
(B1)普通ポルトランドセメント(住友大阪セメント株式会社製):BET比表面積0.72m2/g
(B2)高炉スラグ微粉末(日鉄セメント株式会社製 スピリッツ4000):BET比表面積0.94m2/g ・(B) Component (B1) Ordinary Portland cement (manufactured by Sumitomo Osaka Cement Co., Ltd.): BET specific surface area 0.72 m 2 /g
(B2) Ground blast furnace slag (Nippon Steel Cement Co., Ltd. Spirits 4000): BET specific surface area 0.94 m 2 /g
(B1)普通ポルトランドセメント(住友大阪セメント株式会社製):BET比表面積0.72m2/g
(B2)高炉スラグ微粉末(日鉄セメント株式会社製 スピリッツ4000):BET比表面積0.94m2/g ・(B) Component (B1) Ordinary Portland cement (manufactured by Sumitomo Osaka Cement Co., Ltd.): BET specific surface area 0.72 m 2 /g
(B2) Ground blast furnace slag (Nippon Steel Cement Co., Ltd. Spirits 4000): BET specific surface area 0.94 m 2 /g
<BET比表面積>
(A)成分及び(B)成分等のBET比表面積は、BET流動法(1点法/多点法)、「JISZ8830:2013 ガス吸着による粉体(固体)の比表面積測定方法」に基づいた方法により算出した。具体的には、MOUNTECH Co.,LTD製全自動比表面積測定装置「Macsorb」により、各成分のBET比表面積を算出した。 <BET specific surface area>
The BET specific surface areas of components (A) and (B) are based on the BET flow method (single-point method/multi-point method) and "JISZ8830:2013 Method for measuring the specific surface area of powder (solid) by gas adsorption". calculated by the method. Specifically, the BET specific surface area of each component was calculated using a fully automatic specific surface area measuring device "Macsorb" manufactured by MOUNTECH Co., LTD.
(A)成分及び(B)成分等のBET比表面積は、BET流動法(1点法/多点法)、「JISZ8830:2013 ガス吸着による粉体(固体)の比表面積測定方法」に基づいた方法により算出した。具体的には、MOUNTECH Co.,LTD製全自動比表面積測定装置「Macsorb」により、各成分のBET比表面積を算出した。 <BET specific surface area>
The BET specific surface areas of components (A) and (B) are based on the BET flow method (single-point method/multi-point method) and "JISZ8830:2013 Method for measuring the specific surface area of powder (solid) by gas adsorption". calculated by the method. Specifically, the BET specific surface area of each component was calculated using a fully automatic specific surface area measuring device "Macsorb" manufactured by MOUNTECH Co., LTD.
<実施例及び比較例>
表1~3に示す組成の掘削スラリーをそれぞれ調製し、下記のスラリー通過率(%)及びスラリー通過率の割合(%)に基づいて掘削スラリー用逸液防止材の逸液防止効果の評価を行った。なお、表2、3において、配合比は、粉体(P)中の(A)成分又は(B)成分の割合(質量%)に相当する。 <Examples and Comparative Examples>
Drilling slurries having the compositions shown in Tables 1 to 3 were prepared, and the leakage prevention effect of the leakage prevention material for drilling slurry was evaluated based on the following slurry passage rate (%) and slurry passage rate (%). gone. In Tables 2 and 3, the compounding ratio corresponds to the ratio (% by mass) of component (A) or component (B) in powder (P).
表1~3に示す組成の掘削スラリーをそれぞれ調製し、下記のスラリー通過率(%)及びスラリー通過率の割合(%)に基づいて掘削スラリー用逸液防止材の逸液防止効果の評価を行った。なお、表2、3において、配合比は、粉体(P)中の(A)成分又は(B)成分の割合(質量%)に相当する。 <Examples and Comparative Examples>
Drilling slurries having the compositions shown in Tables 1 to 3 were prepared, and the leakage prevention effect of the leakage prevention material for drilling slurry was evaluated based on the following slurry passage rate (%) and slurry passage rate (%). gone. In Tables 2 and 3, the compounding ratio corresponds to the ratio (% by mass) of component (A) or component (B) in powder (P).
〔掘削スラリーの調製方法〕
表1~3に示す配合比及び水(W)と粉体(P)の質量比(W)/(P)となるように、水に(A1)成分、(A2)成分、(B1)成分又は(B2)成分を配合し、市販のハンドミキサーを用いて1分間混錬し、掘削スラリーを得た。 [Method for preparing drilling slurry]
Component (A1), component (A2), and component (B1) are added to water so that the mixing ratio shown in Tables 1 to 3 and the mass ratio (W)/(P) of water (W) and powder (P) are obtained. Alternatively, the component (B2) was blended and kneaded for 1 minute using a commercially available hand mixer to obtain a drilling slurry.
表1~3に示す配合比及び水(W)と粉体(P)の質量比(W)/(P)となるように、水に(A1)成分、(A2)成分、(B1)成分又は(B2)成分を配合し、市販のハンドミキサーを用いて1分間混錬し、掘削スラリーを得た。 [Method for preparing drilling slurry]
Component (A1), component (A2), and component (B1) are added to water so that the mixing ratio shown in Tables 1 to 3 and the mass ratio (W)/(P) of water (W) and powder (P) are obtained. Alternatively, the component (B2) was blended and kneaded for 1 minute using a commercially available hand mixer to obtain a drilling slurry.
〔スラリー通過率〕
まず、内径25mm、高さ400mmのガラス製カラムにガラスフィルターG1(JIS細孔の大きさ;100~120μm)のフィルターとコックを取り付けた。このカラムに3号珪砂を100g詰めた。珪砂の密度を、JIS A 1225「土の湿潤密度試験方法」にしたがって測定したところ、2.0g/cm3であった。
次に、カラムのコックを閉めた状態で、カラムに表1~3に示す組成で調製された掘削スラリーを100g添加し、添加後コックを開いた。コックを開いた時点を計測開始時間とし、計測開始時間から10分間にコックから流れ出た掘削スラリーの質量(g)を計測した。そして、カラムに添加された掘削スラリーの質量(g)に対する、10分間にコックから流れ出た掘削スラリーの質量(g)の割合(質量%)を算出し、この割合をスラリー通過率(%)とした。結果を表1~3に示す。スラリー通過率が低いほど、逸液防止材による掘削スラリーの逸液防止効果が高い。そして、各実施例のスラリーは、水(W)と粉体(P)の質量比(W)/(P)が、掘削スラリーに適した粘度(例えば、ファンネル粘性(500ml/500ml)が180秒以下)を達成しやすい質量比でありながら、逸液防止効果が高く、使用した粉体(P)も掘削スラリーとして用いられる成分であるので、土壌の掘削時の掘削スラリーとしてその機能を損なわずに使用できると考えられる。 [Slurry passage rate]
First, a glass filter G1 (JIS pore size: 100 to 120 μm) and a cock were attached to a glass column having an inner diameter of 25 mm and a height of 400 mm. This column was packed with 100 g of No. 3 silica sand. The density of silica sand was 2.0 g/cm 3 when measured according to JIS A 1225 "Wet Density Test Method for Soil".
Next, 100 g of drilling slurry prepared with the composition shown in Tables 1 to 3 was added to the column with the cock of the column closed, and the cock was opened after the addition. The measurement was started when the cock was opened, and the mass (g) of the drilling slurry that flowed out from the cock was measured for 10 minutes from the measurement start time. Then, the ratio (% by mass) of the mass (g) of the drilling slurry flowing out of the cock in 10 minutes to the mass (g) of the drilling slurry added to the column is calculated, and this ratio is referred to as the slurry passage rate (%). did. The results are shown in Tables 1-3. The lower the slurry passage rate, the higher the leakage prevention effect of the excavation slurry by the leakage prevention material. The slurry of each example has a mass ratio (W)/(P) of water (W) and powder (P) that is suitable for drilling slurry (for example, funnel viscosity (500 ml/500 ml) is 180 seconds below), it has a high liquid leakage prevention effect, and the powder (P) used is also a component used as an excavating slurry, so it does not impair its function as an excavating slurry when excavating soil. can be used for
まず、内径25mm、高さ400mmのガラス製カラムにガラスフィルターG1(JIS細孔の大きさ;100~120μm)のフィルターとコックを取り付けた。このカラムに3号珪砂を100g詰めた。珪砂の密度を、JIS A 1225「土の湿潤密度試験方法」にしたがって測定したところ、2.0g/cm3であった。
次に、カラムのコックを閉めた状態で、カラムに表1~3に示す組成で調製された掘削スラリーを100g添加し、添加後コックを開いた。コックを開いた時点を計測開始時間とし、計測開始時間から10分間にコックから流れ出た掘削スラリーの質量(g)を計測した。そして、カラムに添加された掘削スラリーの質量(g)に対する、10分間にコックから流れ出た掘削スラリーの質量(g)の割合(質量%)を算出し、この割合をスラリー通過率(%)とした。結果を表1~3に示す。スラリー通過率が低いほど、逸液防止材による掘削スラリーの逸液防止効果が高い。そして、各実施例のスラリーは、水(W)と粉体(P)の質量比(W)/(P)が、掘削スラリーに適した粘度(例えば、ファンネル粘性(500ml/500ml)が180秒以下)を達成しやすい質量比でありながら、逸液防止効果が高く、使用した粉体(P)も掘削スラリーとして用いられる成分であるので、土壌の掘削時の掘削スラリーとしてその機能を損なわずに使用できると考えられる。 [Slurry passage rate]
First, a glass filter G1 (JIS pore size: 100 to 120 μm) and a cock were attached to a glass column having an inner diameter of 25 mm and a height of 400 mm. This column was packed with 100 g of No. 3 silica sand. The density of silica sand was 2.0 g/cm 3 when measured according to JIS A 1225 "Wet Density Test Method for Soil".
Next, 100 g of drilling slurry prepared with the composition shown in Tables 1 to 3 was added to the column with the cock of the column closed, and the cock was opened after the addition. The measurement was started when the cock was opened, and the mass (g) of the drilling slurry that flowed out from the cock was measured for 10 minutes from the measurement start time. Then, the ratio (% by mass) of the mass (g) of the drilling slurry flowing out of the cock in 10 minutes to the mass (g) of the drilling slurry added to the column is calculated, and this ratio is referred to as the slurry passage rate (%). did. The results are shown in Tables 1-3. The lower the slurry passage rate, the higher the leakage prevention effect of the excavation slurry by the leakage prevention material. The slurry of each example has a mass ratio (W)/(P) of water (W) and powder (P) that is suitable for drilling slurry (for example, funnel viscosity (500 ml/500 ml) is 180 seconds below), it has a high liquid leakage prevention effect, and the powder (P) used is also a component used as an excavating slurry, so it does not impair its function as an excavating slurry when excavating soil. can be used for
また、水(W)と粉体(P)の質量比(W)/(P)が同じ掘削スラリーにおいて、(A)成分を含まない掘削スラリーのスラリー通過率を基準値として、この基準値に対する掘削スラリー通過率の割合(%)をそれぞれ算出した。スラリー通過率の割合(%)を表2~3に示す。また、表3の比較例3-1aのスラリー通過率を基準値とした場合の、粉体(P)中の(A)成分の配合比と、この基準値に対する実施例3-1a~3-1hのスラリー通過率の割合との関係を図1に示す。
Further, in a drilling slurry having the same mass ratio (W)/(P) of water (W) and powder (P), the slurry passage rate of the drilling slurry that does not contain the (A) component is set as a reference value, and The rate (%) of the excavation slurry passage rate was calculated respectively. Tables 2 and 3 show the ratio (%) of the slurry passage rate. Further, when the slurry passage rate of Comparative Example 3-1a in Table 3 is taken as a reference value, the blending ratio of the component (A) in the powder (P) and Examples 3-1a to 3- for this reference value FIG. 1 shows the relationship with the rate of slurry passing rate for 1 h.
表2、3のスラリー通過率の割合(%)の結果より、本発明の逸液防止材は、水(W)と粉体(P)の質量比(W)/(P)が同じ掘削スラリーでも、(A)成分の影響によりその逸液が効果的に防止されることがわかる。例えば、図1に示すように、水(W)と粉体(P)の質量比(W)/(P)が100の掘削スラリーにおいて、(A)成分の配合比が0の場合(比較例3-1a、基準値)と比較して、(A)成分の配合比が10質量%の場合(実施例3-1h)は、基準値に対するスラリー通過率の割合が大幅に減少した。したがって、実施例3-1a~3-1hの掘削スラリーを用いることで、掘削部周囲地盤への掘削スラリーの流出を抑制し、掘削時におけるスムーズな施工ができると考えられる。
From the results of the ratio (%) of the slurry passage rate in Tables 2 and 3, the leakage prevention material of the present invention has the same mass ratio (W) / (P) of water (W) and powder (P) However, it can be seen that the leakage of the liquid is effectively prevented by the influence of the component (A). For example, as shown in FIG. 1, in a drilling slurry in which the mass ratio (W)/(P) of water (W) and powder (P) is 100, when the compounding ratio of component (A) is 0 (comparative example 3-1a, reference value), when the compounding ratio of component (A) was 10% by mass (Example 3-1h), the ratio of the slurry passage rate to the reference value was significantly reduced. Therefore, by using the excavation slurries of Examples 3-1a to 3-1h, it is considered that the outflow of the excavation slurry to the ground surrounding the excavation can be suppressed, and smooth construction can be performed during excavation.
Claims (15)
- 密度が0.4g/cm3以上2.5g/cm3以下の土壌を、水(W)と粉体(P)を含むスラリーを用いて掘削すること、を行う地盤改良方法であって、
粉体(P)は、(A)BET比表面積が1.2m2/g以上5m2/g以下の無機粉体〔以下(A)成分という〕を含み、
粉体(P)中、(A)成分の割合が10質量%以上であり、
前記スラリーの水(W)と粉体(P)の質量比(W)/(P)が、70質量%以上150質量%以下である、
地盤改良方法。 A soil improvement method for excavating soil having a density of 0.4 g/cm 3 or more and 2.5 g/cm 3 or less using a slurry containing water (W) and powder (P),
The powder (P) contains (A) an inorganic powder having a BET specific surface area of 1.2 m 2 /g or more and 5 m 2 /g or less [hereinafter referred to as component (A)],
The proportion of the component (A) in the powder (P) is 10% by mass or more,
The mass ratio (W)/(P) of water (W) and powder (P) in the slurry is 70% by mass or more and 150% by mass or less.
Soil improvement method. - 粉体(P)は、(B)BET比表面積が0.4m2/g以上1.0m2/g以下の無機粉体〔以下(B)成分という〕を含む、請求項1に記載の地盤改良方法。 The ground according to claim 1, wherein the powder (P) contains (B) an inorganic powder having a BET specific surface area of 0.4 m 2 /g or more and 1.0 m 2 /g or less [hereinafter referred to as component (B)]. How to improve.
- (B)成分は、セメントである、請求項2に記載の地盤改良方法。 The ground improvement method according to claim 2, wherein the component (B) is cement.
- 粉体(P)中、(A)成分と(B)成分の合計含有量が70質量%以上である、請求項2又は3に記載の地盤改良方法。 The ground improvement method according to claim 2 or 3, wherein the total content of the components (A) and (B) in the powder (P) is 70% by mass or more.
- 粉体(P)中、(A)成分の含有量と(B)成分の含有量の質量比(B)/(A)が0.4以上2.3以下である、請求項2~4のいずれか1項に記載の地盤改良方法。 Claims 2 to 4, wherein the mass ratio (B)/(A) of the content of the component (A) to the content of the component (B) in the powder (P) is 0.4 or more and 2.3 or less. The ground improvement method according to any one of the items.
- スラリー中の(A)成分と(B)成分の合計含有量が12質量%以上55質量%以下である、請求項2~5のいずれか1項に記載の地盤改良方法。 The ground improvement method according to any one of claims 2 to 5, wherein the total content of component (A) and component (B) in the slurry is 12% by mass or more and 55% by mass or less.
- 前記地盤改良方法は、中層混合処理工法又は深層混合処理工法である、請求項1~6のいずれか1項に記載の地盤改良方法。 The ground improvement method according to any one of claims 1 to 6, wherein the ground improvement method is an intermediate layer mixing method or a deep layer mixing method.
- 粉体(P)中、(A)成分の割合が30質量%以上である、請求項1~7のいずれか1項に記載の地盤改良方法。 The ground improvement method according to any one of claims 1 to 7, wherein the proportion of component (A) in the powder (P) is 30% by mass or more.
- (A)成分は、高炉スラグである、請求項1~8のいずれか1項に記載の地盤改良方法。 The ground improvement method according to any one of claims 1 to 8, wherein the component (A) is blast furnace slag.
- スラリー中の(A)成分の含有量が、6質量%以上55質量%以下である、請求項1~9のいずれか1項に記載の地盤改良方法。 The soil improvement method according to any one of claims 1 to 9, wherein the content of component (A) in the slurry is 6% by mass or more and 55% by mass or less.
- 中層混合処理工法、深層混合処理工法、パワーブレンダー工法及び既製杭の埋め込み工法から選ばれる工法である、請求項1~10のいずれか1項に記載の地盤改良方法。 The ground improvement method according to any one of claims 1 to 10, which is a method selected from the middle layer mixing method, the deep layer mixing method, the power blender method, and the prefabricated pile embedding method.
- 水(W)と粉体(P)を、70質量%以上150質量%以下の質量比(W)/(P)で含む掘削スラリーに粉体(P)として用いられ、当該掘削スラリーが掘削部の周囲の地盤に流出することを防止する掘削スラリー用逸液防止材であって、
(A)BET比表面積が1.2m2/g以上5m2/g以下の無機粉体〔以下(A)成分という〕を含み、
(A)成分が、粉体(P)に対して10質量%以上の割合で用いられる、
掘削スラリー用逸液防止材。 The powder (P) is used in an excavating slurry containing water (W) and powder (P) at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less, and the excavating slurry is used as the excavating portion A leakage prevention material for drilling slurry that prevents outflow to the ground around the
(A) contains an inorganic powder having a BET specific surface area of 1.2 m 2 /g or more and 5 m 2 /g or less [hereinafter referred to as component (A)],
(A) component is used in a proportion of 10% by mass or more with respect to the powder (P),
Liquid leakage prevention material for drilling slurry. - 水(W)と粉体(P)を、70質量%以上150質量%以下の質量比(W)/(P)で含み、
粉体(P)は、(A)BET比表面積が1.2m2/g以上5m2/g以下の無機粉体を10質量%以上含む、
掘削スラリー。 Containing water (W) and powder (P) at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less,
The powder (P) contains 10% by mass or more of (A) an inorganic powder having a BET specific surface area of 1.2 m 2 /g or more and 5 m 2 /g or less.
drilling slurry. - 請求項13に記載の掘削スラリーの、密度が0.4g/cm3以上2.5g/cm3以下の土壌の掘削への使用。 Use of the excavating slurry according to claim 13 for excavating soil having a density of 0.4 g/cm 3 or more and 2.5 g/cm 3 or less.
- 水(W)と粉体(P)を、70質量%以上150質量%以下の質量比(W)/(P)で配合し、
粉体(P)として、該粉体(P)に対して10質量%以上の割合で(A)BET比表面積が1.2m2/g以上5m2/g以下の無機粉体を配合する、
掘削スラリーの製造方法。 Water (W) and powder (P) are blended at a mass ratio (W)/(P) of 70% by mass or more and 150% by mass or less,
As the powder (P), (A) an inorganic powder having a BET specific surface area of 1.2 m 2 /g or more and 5 m 2 /g or less is blended at a rate of 10% by mass or more with respect to the powder (P).
A method for producing a drilling slurry.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2023500940A JP7265691B2 (en) | 2021-02-22 | 2022-02-18 | Soil improvement method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021-026112 | 2021-02-22 | ||
JP2021026112 | 2021-02-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022176977A1 true WO2022176977A1 (en) | 2022-08-25 |
Family
ID=82930732
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2022/006644 WO2022176977A1 (en) | 2021-02-22 | 2022-02-18 | Site improvement method |
Country Status (2)
Country | Link |
---|---|
JP (1) | JP7265691B2 (en) |
WO (1) | WO2022176977A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010090200A (en) * | 2008-10-03 | 2010-04-22 | Kao Corp | Powder composition for use in grouting material |
JP2015196829A (en) * | 2014-04-03 | 2015-11-09 | 宇部興産株式会社 | Insolubilizer and insolubilization method |
JP2018100409A (en) * | 2016-12-19 | 2018-06-28 | 太平洋セメント株式会社 | Soil granulating additive |
JP2020029502A (en) * | 2018-08-22 | 2020-02-27 | 太平洋セメント株式会社 | Solidification material and solidification method of soil |
-
2022
- 2022-02-18 JP JP2023500940A patent/JP7265691B2/en active Active
- 2022-02-18 WO PCT/JP2022/006644 patent/WO2022176977A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010090200A (en) * | 2008-10-03 | 2010-04-22 | Kao Corp | Powder composition for use in grouting material |
JP2015196829A (en) * | 2014-04-03 | 2015-11-09 | 宇部興産株式会社 | Insolubilizer and insolubilization method |
JP2018100409A (en) * | 2016-12-19 | 2018-06-28 | 太平洋セメント株式会社 | Soil granulating additive |
JP2020029502A (en) * | 2018-08-22 | 2020-02-27 | 太平洋セメント株式会社 | Solidification material and solidification method of soil |
Also Published As
Publication number | Publication date |
---|---|
JPWO2022176977A1 (en) | 2022-08-25 |
JP7265691B2 (en) | 2023-04-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6693770B2 (en) | Ground improvement material and ground improvement method using the same | |
WO2005095300A1 (en) | Concrete composition, process for producing the same, method of regulating viscosity, and method of constructing cast-in-place concrete pile from the concrete composition | |
JP2005002583A (en) | Construction method of underground impervious wall | |
JP7265691B2 (en) | Soil improvement method | |
JP6487133B1 (en) | Ground improvement method | |
JP6498716B2 (en) | Ground improvement method | |
JP4976073B2 (en) | Repair method for underground filler and earth structure | |
JP7299869B2 (en) | Ground improvement method | |
JP7265498B2 (en) | Ground improvement method | |
JP6776391B2 (en) | Ground improvement materials, cement milk, and ground improvement methods | |
JP2882259B2 (en) | Hydraulic material and self-hardening stabilizer | |
JP3443597B2 (en) | Flowable backfill material | |
JP3552302B2 (en) | Solidified material for fluidized backfill method | |
JP6578316B2 (en) | Ground improvement method | |
JP3088628B2 (en) | Self-hardening stabilizer | |
JP2004217870A (en) | Soil-stabilized soil and method for producing the same | |
JP6755828B2 (en) | Ground improvement method | |
JP3680866B2 (en) | Manufacturing method of self-hardening stabilizer and underground wall construction method | |
JP7326384B2 (en) | Ground improvement method | |
JPS609171B2 (en) | How to build a continuous water-stop wall | |
CN107162516A (en) | A kind of curing agent and its application process for curing process discarded slurry | |
JP3261647B2 (en) | One-powder type composition for back hardening material | |
JP2021080408A (en) | Additive for ground improvement, and material for ground improvement, cement milk and ground improvement method based on that additive | |
JP2023107152A (en) | Construction method for filling drilling stabilizer into ground | |
JP2000053961A (en) | Improvement of ground |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22756294 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2023500940 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 22756294 Country of ref document: EP Kind code of ref document: A1 |