CN114059527A - Large-diameter mixing pile construction method suitable for high-groundwater-level hard soil layer - Google Patents
Large-diameter mixing pile construction method suitable for high-groundwater-level hard soil layer Download PDFInfo
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- CN114059527A CN114059527A CN202111501374.8A CN202111501374A CN114059527A CN 114059527 A CN114059527 A CN 114059527A CN 202111501374 A CN202111501374 A CN 202111501374A CN 114059527 A CN114059527 A CN 114059527A
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- 238000002156 mixing Methods 0.000 title claims abstract description 115
- 239000002689 soil Substances 0.000 title claims abstract description 88
- 238000010276 construction Methods 0.000 title claims abstract description 26
- 239000003673 groundwater Substances 0.000 title claims abstract description 20
- 238000005553 drilling Methods 0.000 claims abstract description 83
- 238000003756 stirring Methods 0.000 claims abstract description 42
- 239000002002 slurry Substances 0.000 claims abstract description 20
- 238000007873 sieving Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 39
- 230000008569 process Effects 0.000 claims description 21
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 238000013461 design Methods 0.000 claims description 11
- 238000012360 testing method Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000000440 bentonite Substances 0.000 claims description 5
- 229910000278 bentonite Inorganic materials 0.000 claims description 5
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 5
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 4
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 4
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 2
- 230000003116 impacting effect Effects 0.000 claims description 2
- 239000004568 cement Substances 0.000 abstract description 6
- 238000012216 screening Methods 0.000 abstract description 5
- 238000005299 abrasion Methods 0.000 abstract description 4
- 238000007596 consolidation process Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 4
- 235000017491 Bambusa tulda Nutrition 0.000 description 4
- 241001330002 Bambuseae Species 0.000 description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 4
- 239000011425 bamboo Substances 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/66—Mould-pipes or other moulds
- E02D5/68—Mould-pipes or other moulds for making bulkheads or elements thereof
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention relates to a construction method of a large-diameter mixing pile suitable for a high-groundwater-level hard soil layer, which comprises the steps of digging pile positions with pile casing hole positions, embedding pile casings, and enabling the cylinder walls of the pile casings to be vertical to a horizontal plane; drilling a hole to a designed elevation by using a rotary drilling rig, removing pile core soil in the drilled hole, sieving the pile core soil, and backfilling the sieved pile core soil into the drilled hole; and (3) stirring the pile core soil in the drilled hole for four times by using a stirring pile machine, wherein the connection guniting is carried out during the second stirring and the fourth stirring. A rotary drilling rig is adopted for hole guiding, so that smooth drilling of a subsequent mixing pile machine is facilitated; screening fine soil from pile core soil dug by the rotary drilling rig, and backfilling the fine soil into a drilled hole; the mixing pile machine is positioned and centered, the drill rod sinks to the bottom of the hole, the mixing is carried out while the slurry is sprayed, and the operation is repeated, so that the mixing difficulty is effectively reduced while the uniform mixing is ensured, the abrasion of the mixing rod is reduced, and the mixing efficiency is improved; and finally, lifting the rod to form a hole, and waiting for soil consolidation to form the cement soil mixing pile with good seepage-proofing property.
Description
Technical Field
The invention relates to the technical field of foundation pit supporting construction, in particular to a construction method of a large-diameter mixing pile suitable for a high-groundwater-level hard soil layer.
Background
The foundation pit engineering is to guarantee the safety and stability of the underground space formed by downward excavation of the ground during the construction of the underground structure, and comprises measures such as soil retaining structures, underground water control, environment protection and the like, and the underground water is an important factor influencing the safety and stability of the foundation pit. Because the cement soil mixing pile has higher strength, better integrity and seepage-proofing property, in order to ensure that the foundation pit is not influenced by underground water, the foundation pit engineering needs to adopt water-stopping measures, and the cement soil mixing pile is often used as a water-stopping curtain of the foundation pit engineering in a soft soil area. Under the condition of a hard complex soil layer with a high underground water level, the stirring pile machine has the problems of difficulty in drilling down, difficulty in stirring and the like when guniting and drilling, and in the stirring process, a stirring rod is easy to damage, so that the stirring is difficult to continue.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the present invention provides a method for constructing a large-diameter mixing pile suitable for a high-groundwater-level hard soil layer, which solves the technical problems of difficulty in drilling, difficulty in mixing and easy damage of a mixing rod.
(II) technical scheme
In order to achieve the above object, the method for constructing a large-diameter mixing pile suitable for a high-groundwater-level hard soil layer according to the present invention comprises:
s1, digging pile positions to form pile casing hole positions, embedding pile casings in the pile casing hole positions, correcting the pile casings, and tamping the field around the pile casings layer by using clay to ensure that the wall of each pile casing is vertical to the horizontal plane, and the pile positions are positioned on the central axis of each pile casing;
s2, drilling a hole to a designed elevation by using a rotary drilling rig to form a drill hole with a set hole depth, removing pile core soil in the drill hole, sieving the pile core soil, and backfilling the pile core soil into the drill hole;
s3, carrying out primary stirring on the pile core soil in the drilled hole by using a stirring pile machine, wherein in the primary stirring process, after a drill bit of the stirring pile machine is stirred once from an orifice of the drilled hole to the hole bottom, the drill bit of the stirring pile machine is positioned at the hole bottom of the drilled hole;
s4, the mixing pile machine carries out secondary mixing on the pile core soil in the drilled hole, in the secondary mixing process, a drill bit of the mixing pile machine carries out primary mixing from the hole bottom of the drilled hole to an orifice, the drill bit of the mixing pile machine is located at the orifice of the drilled hole, and the mixing pile machine carries out continuous guniting while mixing;
s5, the mixing pile machine carries out third mixing on the pile core soil in the drilled hole, in the third mixing process, a drill bit of the mixing pile machine carries out mixing once from the hole opening of the drilled hole to the hole bottom, and the drill bit of the mixing pile machine is located at the hole bottom of the drilled hole;
s6 the stirring stake machine is right in the drilling the stake core soil carries out the fourth stirring, the fourth stirring in-process, the drill bit of stirring stake machine is followed the hole bottom to the drill way stirring of drilling is once, the drill bit of stirring stake machine is located the drill way of drilling, the stirring stake machine carries out continuous whitewashing when the stirring.
Optionally, before step S1, the method further includes: and S0, leveling the field to a designed elevation, and calibrating the pile position on the field according to a design drawing.
Optionally, the calibrating the pile position on the field according to the design drawing includes: and measuring and paying off on the site according to a design drawing, determining the position of each pile position in the site by using a total station, and implanting a short reinforcing steel bar pile into each pile position.
Optionally, protect a section of thick bamboo and protect a section of thick bamboo for the steel, protect a diameter of section of thick bamboo and be greater than the diameter 20 ~ 30cm of drilling, the elevation on the top of protecting a section of thick bamboo is higher than construction surface 20 ~ 30 cm.
Optionally, in the process of drilling a hole to a designed height by using a rotary drilling rig, controlling the footage speed according to the geological condition, wherein the footage speed of the soft stratum is greater than that of the hard soil layer; and (4) leading holes or impacting the boulder to form holes by a punching drill.
Optionally, in the process of drilling a hole to a designed height by using the rotary drilling rig, a rotating arm of the rotary drilling rig is always vertical to a horizontal plane.
Optionally, the removing the core soil in the borehole comprises: cutting the undisturbed pile core soil at the bottom of the hole into strips by the drill bucket, and loading the strips into the drill bucket to lift the strips out of the soil.
Optionally, when the mixing pile machine is used for mixing the pile core soil in the drill hole for the second time, the mixing pile machine is used for continuously injecting mud into the drill hole, and the mud comprises bentonite and sodium hydroxide.
Optionally, the slurry further comprises sodium carboxymethyl cellulose.
Optionally, a manufacturability test is performed before the construction of the mixing pile machine, and the content of the manufacturability test comprises the drilling and lifting speed of a drill bit, the mixing speed, the air injection pressure and the injection amount in unit time.
(III) advantageous effects
According to the invention, the rotary drilling rig is adopted for hole guiding, so that smooth drilling of the subsequent mixing pile machine is facilitated; screening fine soil from pile core soil dug by the rotary drilling rig, and backfilling the fine soil into a drilled hole; the mixing pile machine is positioned and centered, the drill rod sinks to the bottom of the hole, the mixing is carried out while the slurry is sprayed, and the operation is repeated, so that the mixing difficulty is effectively reduced while the uniform mixing is ensured, the abrasion of the mixing rod is reduced, and the mixing efficiency is improved; and finally, lifting the rod to form a hole, and waiting for soil consolidation to form the cement soil mixing pile with good seepage-proofing property.
Drawings
FIG. 1 is a flow chart of a construction method of a large-diameter mixing pile suitable for a high-groundwater-level hard soil layer according to the invention;
fig. 2 is a construction process diagram of the construction method of the large-diameter mixing pile suitable for the high-groundwater-level hard soil layer.
[ description of reference ]
1: protecting the cylinder; 2: a rotary drilling rig; 3: a pile stirring machine; 4: constructing a surface; 5: a hard soil layer.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings. In which the terms "upper", "lower", etc. are used herein with reference to the orientation of fig. 1.
For a better understanding of the above-described technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1 and 2, the present invention provides a method for constructing a large-diameter mixing pile suitable for a high-groundwater-level hard soil layer, comprising:
digging a hole site of a pile casing 1 at a pile position, burying the pile casing 1 in the hole site of the pile casing 1, correcting the pile casing 1, and tamping a field around the pile casing 1 by using clay in a layering manner to ensure that the wall of the pile casing 1 is vertical to a horizontal plane, and the central point of the pile position is positioned on the central axis of the pile casing 1; before drilling, the pile position is measured again, and the bottom of the pile casing 1 is ensured to be seated on an undisturbed soil layer.
Secondly, the rotary drilling rig 2 is in place, after the hole position is centered, the rotary drilling rig 2 cannot be shifted, the angle of a drilling arm of the rotary drilling rig 2 cannot be changed at will, the rotary drilling rig 2 drills a hole to a designed elevation to form a drilling hole with a set hole depth, and the rotary drilling rig 2 is transferred to the next pile hole for construction; removing pile core soil in the drilled hole, sieving the pile core soil, screening fine soil, and refilling the screened fine soil into the pile hole;
step three, the mixing pile machine 3 is in place, the mixing pile machine 3 is aligned with the drilled hole and then carries out primary mixing on the pile core soil in the drilled hole, in the primary mixing process, after the drill bit of the mixing pile machine 3 is mixed once from the drilled hole opening to the hole bottom, the drill bit of the mixing pile machine 3 is positioned at the hole bottom of the drilled hole, and secondary mixing is carried out after slight stopping;
step four, the mixing pile machine 3 carries out secondary mixing on the pile core soil in the drilled hole, in the secondary mixing process, a drill bit of the mixing pile machine 3 is used for mixing once from the hole bottom to the hole opening of the drilled hole, the drill bit of the mixing pile machine 3 is positioned at the hole opening of the drilled hole, the mixing pile machine 3 is used for continuously spraying the slurry all the time while mixing, and the middle is uninterrupted;
step five, the mixing pile machine 3 is used for carrying out third mixing on the pile core soil in the drilled hole, in the third mixing process, a drill bit of the mixing pile machine 3 is used for mixing once from the hole opening of the drilled hole to the hole bottom, the drill bit of the mixing pile machine 3 is positioned at the hole bottom of the drilled hole, and fourth mixing is carried out after slight stopping;
and sixthly, repeating the step four to meet the requirement of 'two-spraying four-stirring', extracting a drill rod after the repeated stirring is finished, moving the pile machine to the next pile position, and repeating the step construction for the next pile position. Of course, if the drilled hole is not filled after the requirement of "two-spraying and four-stirring" is completed, the third step and the fourth step can be sequentially repeated until the drilled hole is completely filled.
In addition, before the step one, the method further comprises the following steps: and leveling the site to a designed elevation, ensuring the site to be flat and solid so as to meet the construction verticality requirement, and calibrating the pile position on the site according to a design drawing.
The rotary drilling method is adopted for hole forming, so that the hole forming speed is increased, the construction mechanization degree is high, and the construction efficiency is improved; in the construction process, the invention does not pollute the environment, does not have harmful influence on adjacent buildings, and has good economic benefit and social benefit; the hole is formed by adopting a rotary drilling method, so that construction can be carried out under the condition of a hard and complex stratum with a high underground water level, and the problem of difficulty in construction of the stirring pile machine 3 is solved.
According to the invention, the rotary drilling rig 2 is adopted for hole leading, so that the subsequent smooth drilling of the stirring pile machine 3 is facilitated; screening fine soil from the pile core soil dug by the rotary drilling rig 2, and backfilling the fine soil into a drilled hole; the mixing pile machine 3 is positioned and centered, the drill rod sinks to the bottom of the hole, the mixing is carried out while the slurry is sprayed, the operation is repeated, the mixing difficulty is effectively reduced while the uniform mixing is ensured, the abrasion of the mixing rod is reduced, and the mixing efficiency is improved; and finally, lifting the rod to form a hole, and waiting for soil consolidation to form the cement soil mixing pile with good seepage-proofing property.
Further, calibrating the pile position on the site according to the design drawing specifically comprises: and measuring and paying off on the site according to the coordinates of the pile position on the design drawing, determining the position of the pile position in the site by using a total station, and implanting a short reinforced pile at the position of the pile position in the site.
Preferably, the protective cylinder 1 is made of steel, the diameter of the protective cylinder 1 is 20-30 cm larger than that of the drill hole, and a drill bit of the rotary drilling rig 2 can smoothly enter the protective cylinder 1; in addition, the elevation of the top end of the pile casing 1 is 20-30 cm higher than the construction surface 4, the pile casing 1 is buried at a certain depth, the cylinder wall is ensured to be vertical to the horizontal plane, ground water is isolated, soil at an orifice is stabilized, the wall of the hole is protected from collapse, the verticality of the pile casing 1 is ensured, slurry loss is prevented, drilling work is facilitated, and the periphery of the pile casing 1 is tamped by clay in a layered mode.
As shown in fig. 2, in the process of drilling a hole to a designed elevation by using the rotary drilling rig 2, the rotating arm of the rotary drilling rig 2 is always vertical to the horizontal plane. In the process of drilling a hole to a designed elevation by using the rotary drilling rig 2, the footage speed is controlled according to geological conditions, the footage speed of the soft stratum is greater than that of the hard soil layer 5, and the drilling speed can be properly accelerated when the hard soil layer 5 drills into the soft stratum; when the soft stratum is changed into the hard soil layer 5, slowing down and slowly advancing; drilling the hard plastic layer at a high rotating speed to improve the drilling efficiency; when drilling in a sludge layer, the speed is reduced and the drilling is carried out slowly; if the boulder is difficult to drill and cannot be taken out, the hole is led or punched by a punching machine. Preferably, during drilling, the drill pipe is checked for sag from time to ensure that the walls of the hole are vertical. The lifting speed of the drill bit in the hole must be controlled in the drilling process, so that the hole wall collapse caused by the scouring and negative pressure of slurry on the hole wall is prevented. During the drilling and pore-forming process of the rotary drilling rig 2, drilling parameters are reasonably selected according to the change of strata and hole depth, mud is modulated in time, and the pore-forming quality is ensured. During drilling construction, a face shovel excavator is used for timely clearing and transporting drilling slag, so that the site is clean and tidy, and the next construction is facilitated. After the drilling is stopped when the drilling reaches the required hole depth, the elevation of the orifice of the slurry surface of the slurry in the hole is kept level, and the stability of the hole wall is ensured.
Clearing away pile core soil in the drill hole comprises: after the hole forming depth reaches the design requirement, the hole is cleaned by using a drill cylinder, and the drilling slag is removed by using a drilling bucket (a drilling bucket with a baffle plate) in the hole, namely, the undisturbed soil at the bottom of the hole is cut into strips by the drilling bucket and is loaded into the drilling bucket to lift the soil, so that the sediment at the bottom of the hole can meet the design requirement.
When the rotary drilling rig 2 drills into a hole, slurry is injected into the hole, wherein the slurry comprises bentonite, sodium hydroxide and sodium carboxymethylcellulose. Specifically, when the rotary drilling rig 2 drills into a hole, slurry needs to be injected into the hole to prevent hole collapse; in order to ensure the quality of the retaining wall, bentonite is prepared on site under the condition of mainly utilizing original soil for slurry preparation. The slurry is prepared by adding CMC (sodium carboxymethylcellulose) into high-quality bentonite and sodium hydroxide according to actual conditions. In the drilling process, the verticality of the drill rod is often checked to ensure that the hole wall is vertical, the lifting speed of the drill bit in the hole must be controlled, and the hole wall collapse caused by the scouring and negative pressure of slurry on the hole wall is prevented. In the process of drilling and forming the hole, drilling parameters are reasonably selected according to stratum and hole depth changes, and the slurry is modulated in time to ensure the hole forming quality.
The technological test is carried out before the construction of the mixing pile machine 3, and the content of the technological test comprises the drilling and lifting speed of a drill bit, the mixing speed, the air injection pressure, the injection amount in unit time and the like. The pile-forming manufacturability test is carried out on the engineering pile, and is mainly used for core-pulling detection so as to ensure that the pile-forming quality is comprehensively mastered.
According to the invention, the rotary drilling rig 2 is adopted for hole leading, so that the subsequent smooth drilling of the stirring pile machine 3 is facilitated; screening fine soil from the pile core soil dug by the rotary drilling rig 2, and backfilling the fine soil into a drilled hole; the mixing pile machine 3 is positioned and centered, the drill rod sinks to the bottom of the hole, the mixing is carried out while the slurry is sprayed, the operation is repeated, the mixing difficulty is effectively reduced while the uniform mixing is ensured, the abrasion of the mixing rod is reduced, and the mixing efficiency is improved; and finally, lifting the rod to form a hole, and waiting for soil consolidation to form the cement soil mixing pile with good seepage-proofing property.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.
In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.
Claims (10)
1. A construction method of a large-diameter mixing pile suitable for a high-groundwater-level hard soil layer is characterized by comprising the following steps:
s1, digging pile positions to form pile casing hole positions, embedding pile casings in the pile casing hole positions, correcting the pile casings, and tamping the field around the pile casings layer by using clay to ensure that the wall of each pile casing is vertical to the horizontal plane, and the pile positions are positioned on the central axis of each pile casing;
s2, drilling a hole to a designed elevation by using a rotary drilling rig to form a drill hole with a set hole depth, removing pile core soil in the drill hole, sieving the pile core soil, and backfilling the pile core soil into the drill hole;
s3, carrying out primary stirring on the pile core soil in the drilled hole by using a stirring pile machine, wherein in the primary stirring process, after a drill bit of the stirring pile machine is stirred once from an orifice of the drilled hole to the hole bottom, the drill bit of the stirring pile machine is positioned at the hole bottom of the drilled hole;
s4, the mixing pile machine carries out secondary mixing on the pile core soil in the drilled hole, in the secondary mixing process, a drill bit of the mixing pile machine carries out primary mixing from the hole bottom of the drilled hole to an orifice, the drill bit of the mixing pile machine is located at the orifice of the drilled hole, and the mixing pile machine carries out continuous guniting while mixing;
s5, the mixing pile machine carries out third mixing on the pile core soil in the drilled hole, in the third mixing process, a drill bit of the mixing pile machine carries out mixing once from the hole opening of the drilled hole to the hole bottom, and the drill bit of the mixing pile machine is located at the hole bottom of the drilled hole;
s6 the stirring stake machine is right in the drilling the stake core soil carries out the fourth stirring, the fourth stirring in-process, the drill bit of stirring stake machine is followed the hole bottom to the drill way stirring of drilling is once, the drill bit of stirring stake machine is located the drill way of drilling, the stirring stake machine carries out continuous whitewashing when the stirring.
2. The method for constructing a large-diameter mixing pile suitable for a high-groundwater-level hard soil layer according to claim 1, further comprising, before step S1: and S0, leveling the field to a designed elevation, and calibrating the pile position on the field according to a design drawing.
3. The method for constructing a large-diameter mixing pile suitable for a high-groundwater-level hard soil layer according to claim 2, wherein the calibrating the pile position on the ground according to the design drawing comprises: and measuring and paying off on the site according to a design drawing, determining the position of each pile position in the site by using a total station, and implanting a short reinforcing steel bar pile into each pile position.
4. The method for constructing a large-diameter mixing pile suitable for a high-groundwater-level hard soil layer according to any one of claims 1 to 3, wherein the pile casing is a steel pile casing, the diameter of the pile casing is 20-30 cm larger than that of the drill hole, and the elevation of the top end of the pile casing is 20-30 cm higher than the construction surface.
5. The method for constructing a large-diameter mixing pile suitable for a high-groundwater-level hard soil layer according to any one of claims 1 to 3, wherein a rotary drilling rig is used for drilling a hole to a designed height, the footage speed is controlled according to geological conditions, and the footage speed of a soft stratum is higher than that of a hard soil layer; and (4) leading holes or impacting the boulder to form holes by a punching drill.
6. The method for constructing the large-diameter mixing pile suitable for the high-groundwater-level hard soil layer according to any one of claims 1 to 3, wherein in the process of drilling a hole to a designed standard height by using the rotary drilling rig, a rotating arm of the rotary drilling rig is always vertical to a horizontal plane.
7. The method for constructing a large-diameter mixing pile suitable for a high-groundwater-level hard soil layer according to any one of claims 1 to 3, wherein the removing of the pile core soil in the bore hole comprises: cutting the undisturbed pile core soil at the bottom of the hole into strips by the drill bucket, and loading the strips into the drill bucket to lift the strips out of the soil.
8. The method for constructing a large-diameter mixing pile suitable for a high-groundwater-level hard soil layer according to any one of claims 1 to 3, wherein the mixing pile machine continuously injects slurry into the bore hole when the mixing pile machine performs the second mixing of the pile core soil in the bore hole, and the slurry comprises bentonite and sodium hydroxide.
9. The method of constructing a large-diameter mixing pile suitable for use in high-groundwater-level hard earth layers according to claim 8, wherein the slurry further comprises sodium carboxymethyl cellulose.
10. The method for constructing a large-diameter mixing pile suitable for a high-groundwater-level hard soil layer according to any one of claims 1 to 3, wherein a manufacturability test is performed before the mixing pile construction, and the content of the manufacturability test comprises the drilling and lifting speed of a drill bit, the mixing speed, the air injection pressure and the injection amount per unit time.
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