CN100386484C - New type cement soil pile and its construction method - Google Patents
New type cement soil pile and its construction method Download PDFInfo
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- CN100386484C CN100386484C CNB2005100829504A CN200510082950A CN100386484C CN 100386484 C CN100386484 C CN 100386484C CN B2005100829504 A CNB2005100829504 A CN B2005100829504A CN 200510082950 A CN200510082950 A CN 200510082950A CN 100386484 C CN100386484 C CN 100386484C
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- 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
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Abstract
The present invention relates to a novel soil cement pile and a construction method thereof for solving the problem that a soil cement mixing pile or a suspended spraying pile can not be widely used in stratums, such as peat soil stratums, mud stratums, shifting sand stratums, sand pebble stratums, etc. The present invention uses a 'reversed thinking method' and uses a reversed doing method of 'first stirring and second injection', namely that a forced stirrer or a drum type stirrer is used, cement, selected good soil, an additive, an admixture, etc., are stirred on the ground, and the novel soil cement pile is formed by using the method of forming a hole by a hollow long spiral drill and pumping stirring materials in a pipe for forming the pile. The soil cement pile is widely suitable for composite foundation piles, slope protection piles, water stopping curtain piles, master piles of soil cement composite piles with reinforced cores, etc., is used for foundation piles, slope protection piles and uplift piles, and can be widely applied to stratums which are not applicable for conventional mixing piles, such as peat soil mixing piles, mud mixing piles, shifting sand mixing piles, sand pebble mixing piles, etc. and suspended spraying piles, showing tremendous superiority.
Description
Technical field
The invention belongs to the pile in the building foundation construction, particularly a kind of new type cement soil pile.Be used for piles such as compound foundation pile, slope protection pile, water-stop curtain stake.Especially more apparent advantage in peat soil, mud, drift sand and sand-pebble layer.
Background technology
Cement mixing method is because its easy construction, with low cost, and is widely used in fields such as ground processing, pattern foundation pit supporting structure and water-stop curtain stake, but no matter agitation pile is used for peat soil, mud still is drift sand or sand cobble stratum, all is subjected to very big restriction.Certain place peat soil of Kunming area for example, black, grey black folder brown, saturated, soft～stream is moulded state, high-compressibility.Proportion is near 1.0, and hole is big, and is extremely loose, void ratio e=3.01～8.04, and average 5.63, water content average out to 267%, organic content average reaches 45.4%, is strong cumulosol, about 3.5 meters of buried depth, about 6.0 meters of average thickness.No matter conventional cement mixing pile is used for compound foundation pile still is used for pattern foundation pit supporting structure, water-stop curtain stake, can not guarantee all that cement paste and peat soil are effective to combine.The someone has found out a kind of way for this reason, earlier with common long screw auger power traction hole, pour into sand in the hole, and then enforcement cement mixing pile, but the method under many circumstances can not pore-forming, and one proposes the long screw auger tool hole of promptly collapsing, when underground artesian water is especially arranged, more can not pore-forming, use and be subjected to very big restriction.When especially organic content is high in the mud stratum, also there is same problem; There is " being fixed up " or " spraying motionless " problem in drift sand or the sand cobble stratum.No matter cement mixing method is whitewashing or dusts, or rotary churning pile, all is subjected to such or such restriction in peat soil, mud, drift sand and sand cobble stratum.Existing stake is that cement paste injection stratum mixes with soil, and its composition is generally cement, original place soil or Admixture.Existing stake can not form " stake " in the high mud of peat soil, organic content, can not play the effect that sealing keeps off soil or consolidated subsoil.
Summary of the invention
Purpose of the present invention just provides a kind of new type cement soil pile, can not pore-forming to solve stratum agitation pile such as peat soil, and cement paste can not effectively combine with foundation soil and the problem that causes agitation pile extensively not to be suitable for.
Technical scheme of the present invention is: a kind of new type cement soil pile, each components by weight percent of its raw material is: 150～400 parts of cement, 600～900 parts in good soil, 200～500 parts of aggregate chips, 50～150 parts in flyash, accelerating admixture (1～3) %, water 900～950kg part.
Described cement can adopt Portland cement, portland slag cement or pulverized fuel ash cement etc.; Good soil can be silt, cohesive soil or sand etc.; Aggregate chips is the byproduct of stone sorting, is used for regulating the proportion and the intensity of cement-soil mix; Flyash has the low strength cement effect, improves the pumpability of mix simultaneously; The accelerating admixture effect is to promote the mix rapid solidification, and improves its early strength.Add early strength admixture in case of necessity,, shorten time of setting to improve its early strength.
Earlier stir the method that afterwards pours into because the present invention adopts, in the hole that spiral drill is drilled to, form new type cement soil pile, so overcome the shortcoming that is not suitable for stratum such as peat soil, mud, drift sand and sandy gravel that conventional agitation pile exists.Can be widely used in foundation pit supporting pile, water-stop curtain stake and compound foundation pile, also can be applicable to female stake of stiff-core cement soil composite pile, be used for foundation pile, slope protection pile, uplift pile, and can be widely used in the stratum that conventional agitation piles such as peat soil, mud, drift sand and sandy gravel can not be suitable for.Shown its great superiority.
The present invention has used " contrary thinking method ", adopt the method for " stir afterwards earlier and pour into ", promptly adopt forced action type or drum mixer, the good soil that will select on the face of land and cement add water and stir the formation mix in the mixer of the face of land, pump into " displacement " formation stake in the stratum then.Effectively having overcome can not pore-forming at some soft foundations, and foundation soil can not effectively combine the shortcoming of pile with cement paste.This prescription can effectively be controlled time of setting, control final strength, control slurry specific gravity.
Below in conjunction with embodiment and accompanying drawing the present invention is described in further detail.
Description of drawings
Fig. 1 is a pile-formation process flow chart of the present invention.
The specific embodiment
Embodiment 1, and newly-built certain office block people's air defense foundation pit supporting project is positioned near the crossing of Kunming Guang Fulu and Dian Chi road, between ten borough chief streets and wide good fortune road.The about 8000m of proposed building general design area
2Frame structure form, basement buried depth be-6.1m, local-5.4 meters, comprises that thick the changing of 600mm fill out bed course.Face of land absolute altitude is ± 0.00, and part-0.7m cheats dark 6.1m and 5.4m, and the basic engineering form is a pile-raft foundation.
Plan to build and be in northeast, basin, Dian Chi on the surface feature, genus lacustrine plain landform unit.Disclose stratum according to 80 meters borings, according to genetic type and sedimentary rhythm, soil layer physical mechanics design parameters, foundation soil is divided into six big layers, existing division is as follows from top to down:
One class: artificial earth fill and plough and to plant layer (Qml+pd) is 1. big layer, comprises 1. 1 layer, 1. 2 subgrades.
Two classes: Quaternary system alluviation, ditch pool hydrostatic sedimentary deposit (Qal+h) silt).Be 2. big layer, comprise 2., 2. 1 subgrade and lens.
Three classes: Quaternary system liminetic facies, lacustrine facies alternately deposited layers (Q1+h), comprise 3., 4., 5., 6. big layer, mainly form by cumulosol, silt, flour sand, cohesive soil.
Each stratum is from last and go up division and be:
1. 1 plain fill: brown Huang, sallow, brown red isochrome, wet, based on the cohesive soil of plastic state, press from both sides a small amount of gravel, be recent backfill, thick about 1.50 meters.
1. 2 plough soil: dark-grey, brown ash, taupe, very wet, soft～plastic state, high-compressibility, the part is the cumulosol of soft-plastic state, thick about 0.00～1.50 meter, the interlayer folder is 1 layer of mud lens 2..
2. 1 mud: dark-grey, grey black look, saturated, soft～stream is moulded state, is mainly the deposit of former Cai Lian river bed portion, only locally has the thickest about 2.9 meters.
3. cumulosol: black, grey black folder brown, saturated, soft～stream is moulded state, high-compressibility.Hole is big, and is extremely loose, void ratio e=3.01～8.04, and average 5.63, water content average out to 267%, organic content average reaches 45.4%, is strong cumulosol, about 3.5 meters of buried depth, about 6.0 meters of average thickness.
4. 1 clay: shallow blue ash, grey, very wet, stream is moulded～soft-plastic state, and is local plastic, high-compressibility, quiet spy static point resistance qc=0.48Mpa, interlayer folder 4. 11,4. 12 layers of lens.
4. 11 silts: blue grey, dark-grey, grey, very wet, in close～close slightly, middle compression.
4. 12 cumulosols: black, grey black look, saturated, soft-plastic state, only local the existence.
4. 2 silts: grey, brown ash, Dark grey, wet, close slightly～in close, middle compression, folder thin layer powder fine sand～medium sand, mark pass through hammering to be counted average N=10 and hits.Hole, interlayer 143,135 place folder is 21 layers of lens 4..
4. 21 silty claies: grey, blue grey, wet, plastic state accompanies a small amount of calcite cementation agglomerate.
4. 3 clays: blue ash, Dark grey, very wet, plastic state, in～high-compressibility.Local folder thin layer organic soil and calcite cementation agglomerate, interlayer folder be 31 silts, 4. 32 cumulosol layer lens 4..
It is clay, silt, cumulosol alternating layers down.
Fixed level between 1.0～0.8m, is mainly diving under the face of land, little tool pressure-bearing property, and the aquifer is a silt, the side impregnation that is mainly Atmospheric precipitation and aquifer is given.
The retaining soil sealing composite support scheme that design adopts reinforced concrete pile to combine with this new type cement soil pile.Simultaneously in local unloading with good conditionsi, beat plain concrete pile and this new type cement soil pile is reinforced at passive area, and be aided with and draw anchor to carry out composite support.
This new type cement soil pile prescription (every 1m
3In the water): cement 300kg, good native 750kg, aggregate chips 300kg, flyash 100kg, accelerating admixture (cement weight) 2%.Adopt aforementioned " long-spiral drilling machine pore-forming, pumping new type cement soil mix pile in the pipe " technology.
Through nearly one months two bench drill machine construction, finished the construction of 1412 piles altogether, wherein reinforced concrete pile is 464,273 of plain concrete piles, 675 of this new type cement soil piles.Find that after excavating reinforced concrete pile combines closely with this new type cement soil pile, stagnant water effect is good, and stake top displacement observation is stable, has now beaten the thick reinforced concrete floor of 900mm.Finished the pattern foundation pit supporting structure task smoothly.
Embodiment 2, and the thick 8～11m of certain silt soil is 4～6m mud matter clay under it, the dark 6～7m of foundation ditch, the about 40000m of foundation ditch area
2, the retaining soil sealing composite support scheme that adopts reinforced concrete pile to combine with this new type cement soil pile replaces former 6 to arrange the agitation pile supporting schemes, can reduce cost effectively, the reduction of erection time, ensure the quality of products.This new type cement soil pile prescription (every 1m
3In the water): cement 350kg, good native 750kg, aggregate chips 250kg, flyash 75kg, accelerating admixture (cement weight) 3%.Requiring mix proportion is 1.3～1.5.Adopt aforementioned " long-spiral drilling machine pore-forming, pumping new type cement soil mix pile in the pipe " technology.
Embodiment 3, certain drift sand formation, and the about 5～6m of thickness, bury of groundwater is more shallow, the dark 12m of foundation ditch, the retaining soil sealing composite support scheme that adopts reinforced concrete pile to combine with this new type cement soil pile can prevent effectively that inter-pile soil runs off, and guarantees the pattern foundation pit supporting structure success.This new type cement soil pile prescription (every 1m
3In the water): cement 300kg, good native 800kg, accelerating admixture (cement weight) 3%.Adopt aforementioned " long-spiral drilling machine pore-forming, pumping new type cement soil mix pile in the pipe " technology.
Embodiment 4, somewhere, Beijing iron sand pebble layer, thick 3～5m, the cobble particle diameter reaches 20cm, cheat dark 15～18m, water level is more shallow, the retaining soil sealing composite support scheme that adopts reinforced concrete pile to draw anchor to combine with this new type cement soil pile, " being fixed up " that can solve agitation pile or rotary churning pile effectively " sprays " problem motionless, guarantees the sealing success.This new type cement soil pile prescription (every 1m
3In the water): cement 300kg, good native 900kg, accelerating admixture (cement weight) 3%.Adopt aforementioned " long-spiral drilling machine pore-forming, pumping new type cement soil mix pile in the pipe " technology.
Embodiment 5, certain top, sub-district miscellaneous fill 2m, the bottom is peat soil 5～7m, is silty clay down, is 6 layers of dwelling house and 3～5 layers of factory building on the ground, adopt this cement earth pile to do female stake, utilize local inexpensive vibration sinking tube technology to make low-grade CFG stake, form composite foundation, increase substantially bearing capacity of single pile at this cement earth pile center, reached that cost is low, the duration is short, the measured purpose of matter, solved the problem that any simple technology cann't be solved.Also can very solve the big difficult problem of CFG mix pile fullness coefficient effectively! This new type cement soil pile prescription (every 1m
3In the water): cement 350kg, good native 750kg, aggregate chips 300kg, flyash 90kg, accelerating admixture (cement weight) 3%.Requiring mix proportion is 1.3～1.5.Adopt aforementioned " long-spiral drilling machine pore-forming, pumping new type cement soil mix pile in the pipe " technology.
The specific embodiment of the various embodiments described above as shown in Figure 1, it at first is routine arrangement (ripe title " three supplies and one leveling ") to the job site, be to carry out preparation of the present invention then, comprise fixed stake position, check that rig is installed, debugging, the rig location, the mix delivery pump pipe is laid in ground pump Installation and Debugging, and cement aggregate chips flyash etc. is marched into the arena, do mix proportion, and agitator is prepared.Enter pile-formation process process of the present invention then: comprising that raw material with each component is added to stirs into compound in the mixer; Adopt hollow type long screw auger tool to break into a hole at the ground place; The land used pump is delivered to the interior pipe of described hollow type drilling tool with the compound that stirs by conveying pipeline, and the limit is risen and pulled out this drilling tool limit and pump into the compound that stirs to the aperture, forms cement earth pile in this hole.Last clear soil, lifting drilling rod and pile are checked and accepted.
Claims (3)
1. new type cement soil pile is added to raw material and stirs into compound in the mixer; Adopt hollow type long screw auger tool to break into a hole at the ground place; The land used pump is delivered to the interior pipe of described hollow type long screw auger tool with the compound that stirs by conveying pipeline, and the limit is risen and pulled out this hollow type long screw auger tool limit and pump into the compound that stirs to a stake aperture, forms cement earth pile in this hole; Described raw material comprises cement, good soil, water, accelerating admixture and the additive of being made up of aggregate chips and/or flyash, it is characterized in that: each components by weight percent of described raw material is: 150～400 parts of cement, 600～900 parts in good soil, 200～500 parts of aggregate chips, 50～150 parts in flyash, the ratio 1%～3% of accelerating admixture by mass of cement, 900～950 parts in water.
2. new type cement soil pile according to claim 1 is characterized in that: the cement in the described raw material adopts Portland cement, portland slag cement or pulverized fuel ash cement; Described good soil is silt, cohesive soil or sand; Described aggregate chips is the byproduct of stone sorting, is used for regulating the proportion and the intensity of cement-soil mix; Described flyash has the low strength cement effect, improves the pumpability of mix simultaneously; The effect of described accelerating admixture is to promote the mix rapid solidification, and improves its early strength.
3. new type cement soil pile according to claim 1 is characterized in that: add an amount of early strength admixture in described raw material, to improve its early strength, shorten time of setting.
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| CNB2005100829504A CN100386484C (en) | 2005-07-07 | 2005-07-07 | New type cement soil pile and its construction method |
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| CNB2005100829504A CN100386484C (en) | 2005-07-07 | 2005-07-07 | New type cement soil pile and its construction method |
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| CN100386484C true CN100386484C (en) | 2008-05-07 |
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Application publication date: 20060111 Assignee: Beijing Geotechnical Engineering Association Assignor: He Shiming Contract record no.: X2021990000086 Denomination of invention: A kind of cement soil pile Granted publication date: 20080507 License type: Exclusive License Record date: 20210205 |