CN108978640A - Cast-in-place pile construction method - Google Patents

Cast-in-place pile construction method Download PDF

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Publication number
CN108978640A
CN108978640A CN201810893323.6A CN201810893323A CN108978640A CN 108978640 A CN108978640 A CN 108978640A CN 201810893323 A CN201810893323 A CN 201810893323A CN 108978640 A CN108978640 A CN 108978640A
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CN
China
Prior art keywords
stake holes
water bag
aperture
hole
cast
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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CN201810893323.6A
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Chinese (zh)
Inventor
魏富平
霍文炎
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Foshan Housing Construction Group Co Ltd
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Foshan Housing Construction Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to CN201810893323.6A priority Critical patent/CN108978640A/en
Publication of CN108978640A publication Critical patent/CN108978640A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/36Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds

Abstract

The present invention relates to building construction technical fields to provide a kind of cast-in-place pile construction method for the problem that the range of Concrete contamination soil layer is larger, and the technical solution is as follows: flattening including (1) place;(2) it drills: aperture of the aperture of pre- stake holes less than stake holes in design drawing;(3) reaming: water bag is put into pre- stake holes, the outer diameter of water bag is consistent with stake holes aperture in design drawing, and water bag length is consistent with stake holes hole depth in design drawing, is greater than 1MPa towards hydraulic pressure is filled in water bag, at least 10 minutes are stood, pressure release draws water and takes out water bag to form whole stake holes;(4) steel reinforcement cage is sunk to;(5) casting concrete;(6) pile crown is abolished.The aperture of pre- stake holes is less than stake holes aperture in design drawing, the hole wall of pre- stake holes is squeezed when using pressurising in water bag to restore with reaming, so that the hole wall soil layer of whole stake holes is closely knit, so that concrete infiltrates into the range in soil layer from hole wall and reduces when perfusion, the range of Concrete contamination soil layer is reduced.

Description

Cast-in-place pile construction method
Technical field
The present invention relates to building construction technical fields, more specifically, it relates to a kind of cast-in-place pile construction method.
Background technique
Bored concrete pile is a kind of pore-forming in place, concrete perfusion or armored concrete and manufactured stake.There are commonly drillings to fill Infuse stake: with twist bit pore-forming concrete perfusion and pile on the spot, when construction is without friction, not soil compaction, but the settling amount of stake is slightly larger. The auger principles of action are for more than level of ground water cohesive soil, sand and artificial earth fill etc., and the soil block that drilling is got off is along drilling rod Helical blade rising is easily discharged out of the hole, aperture 300mm or so, 8~12m of drilling depth, selects drilling rod according to soil property and water content.By It is without friction, without squeezing soil when having many advantages, such as construction, noise is small, is suitable for and uses in City Building dense region, bored concrete pile exists Relatively broad application is obtained in building construction construction.
But due to bored concrete pile effect without squeezing soil, so that stake holes inner wall is comparatively soft, in concrete perfusion, concrete It largely infiltrates into the gap of stake holes inner wall soil layer, so that the range of Concrete contamination soil layer is larger, therefore there are also improve space.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of cast-in-place pile construction method, there is soil Layer advantage of reduced contamination.
To achieve the above object, the present invention provides the following technical scheme that
A kind of cast-in-place pile construction method, comprising the following steps:
(1) place flattens;
(2) it drills, specific as follows:
Drilling device vertical drilling hole is used to form pre- stake holes, the aperture of pre- stake holes is greater than the outer diameter of steel reinforcement cage and is less than design drawing The aperture of stake holes in paper;
(3) reaming, specific as follows:
Hollow cylindrical water bag is put into pre- stake holes, the outer diameter of water bag is consistent with the aperture of stake holes in design drawing, Water bag length is consistent with stake holes hole depth in design drawing, concordant with ground at the top of water bag and be communicated with water injection pipe, towards infusing in water bag Water to hydraulic pressure is greater than 1MPa, stands at least 10 minutes, pressure release draws water and takes out water bag to form whole stake holes;
(4) steel reinforcement cage is sunk to;
(5) casting concrete;
(6) pile crown is abolished.
By adopting the above technical scheme, the aperture by the space of pre- stake holes less than stake holes in design drawing, is put using water bag Enter in pre- stake holes, by towards water filling in water bag to make water bag restore cylindric using hydraulic pressure, due to the outer diameter and design of water bag The aperture of stake holes is consistent in drawing, so that water bag restores columned while squeezing the hole wall of pre- stake holes to expand pre- stake holes The hole wall in hole, whole stake holes is formed by squeezing to expand, so that the hole wall soil layer of whole stake holes is closely knit, stable structure, in perfusion, Hole wall is that compact structure causes concrete to be difficult to permeate, and the range for causing concrete to infiltrate into soil layer from hole wall significantly subtracts It is few, and then reduce the range of Concrete contamination soil layer;Due to squeezing pre- stake holes inner wall using water bag, so that leading to after reaming The water in extraction water bag is crossed, so that water bag is shunk, so that the friction sharp fall of water bag outer wall and whole stake holes inner wall, facilitates water Bag takes out;Using hydraulic pressure reaming, while so that whole stake holes hole wall is closely knit, since hydraulic pressure can select that less direction is hindered to transport It is dynamic, so that the compaction rate of whole stake holes hole wall is more uniformly spread, so that whole stake holes and the distribution of forces of pile body are uniform, reduce Situations such as pile body stress hour offset, inclination;By drilling out pre- stake holes, when so that squeezing soil layer with reaming, extruded soil layer phase Less compared with hidden pipe pile, reducing soil layer extruding leads to the case where influencing soil layer state near construction area, to Adjacent Buildings shadow Sound is less.
Preferably, in the step (2), the hole depth of pre- stake holes is less than the hole depth of stake holes in design drawing.
By adopting the above technical scheme, by the hole depth of pre- stake holes less than stake holes hole depth in design drawing, so that water bag reaming While pre- stake holes bottom hole is squeezed so that whole stake holes bottom compactness rises, stable structure reduces pile body settling amount.
Preferably, in the step (2), the aperture of pre- stake holes is 90% of the aperture of stake holes in design drawing.
By adopting the above technical scheme, the aperture of pre- stake holes is 90% of stake holes aperture in design drawing, guarantees enough extruding Effect avoids excessive extrusion from causing to impact soil layer construction around simultaneously.
Preferably, in the step (2), the hole depth of pre- stake holes is 90% of stake holes hole depth in design drawing.
By adopting the above technical scheme, the hole depth of pre- stake holes is 90% of stake holes hole depth in design drawing, guarantees enough extruding Effect avoids excessive extrusion from causing to impact soil layer construction around simultaneously.
Preferably, in the step (3), water bag is made of polyurethane material, and 10% carbon fiber is mixed in water bag.
By adopting the above technical scheme, water bag is made by polyurethane material, so that the wear-resisting property of water bag and anti-puncturing Performance is preferable, improves the stability of water bag, avoids being punctured breakage when squeezing soil layer, by mixing 10% carbon fiber in water bag, into Water bag is pressurized damaged when the intensity that one step improves water bag avoids high pressure water injection.
Preferably, in the step (3), clump weight is placed in water bag.
By adopting the above technical scheme, by placing clump weight in water bag, so that water bag bottom is more held by gravity Easily enter in pre- stake holes, so that the operation that water bag is put into pre- stake holes is more convenient.
Preferably, in the step (3), rigid plate is connected at the top of water bag, rigid plate is provided with leads to for what water injection pipe was pierced by Hole, after water bag is put into pre- stake holes, rigid plate is abutted on the ground.
By adopting the above technical scheme, it is abutted on the ground by rigid plate, so that it is just concordant with ground at the top of water bag, both It is concordant at the top of pre- stake holes at the top of water bag, so that the precision of reaming is higher, while being generated by rigid plate to the limit at the top of water bag Production is used, and need to only limit rigid plate rising can keep concordant with ground at the top of water bag, so that reaming better quality.
Preferably, in the step (4), when steel reinforcement cage is put into, by the aperture centering of steel reinforcement cage and whole stake holes.
By adopting the above technical scheme, by the aperture centering of steel reinforcement cage and whole stake holes, so that after steel reinforcement cage sinks to whole stake holes, The reinforcing effect of pile body is more uniformly spread by steel reinforcement cage, improves the intensity and quality of bored concrete pile.
Preferably, in the step (3), water bag lateral wall is connected with several convex blocks.
By adopting the above technical scheme, by connecting several convex blocks in water bag outer wall, so that while ream operation, in whole stake Hole inner wall forms several grooves, so that the connection area of pile body and whole stake holes inner wall increases, and then increases stake when concrete perfusion The frictional force of body and whole stake holes inner wall, improves pile body stability, reduces the degree that pile body drifts along.
Preferably, several convex blocks are evenly distributed on water bag lateral wall.
By adopting the above technical scheme, it is evenly distributed on water bag lateral wall by convex block, so that convex block squeezes in pre- stake holes Wall is evenly distributed on whole stake holes inner wall with the groove formed, so that increasing the effect of pile body and whole stake holes inner wall frictional force It more uniformly spreads, better effect.
In conclusion the invention has the following advantages:
1. restoring columned less than the aperture of stake holes in design drawing by the aperture of pre- stake holes using water bag and squeezing simultaneously The hole wall of pre- stake holes is with reaming, so that the hole wall soil layer of whole stake holes is closely knit, stable structure, when perfusion, hole wall is led for compact structure It causes the range for causing concrete to infiltrate into soil layer from hole wall to be greatly reduced, and then reduces the range of Concrete contamination soil layer;
2. due to squeezing pre- stake holes inner wall using water bag, so that after reaming, by the water in extraction water bag, so that water bag It shrinks, so that the friction sharp fall of water bag outer wall and whole stake holes inner wall, Convenient water pocket take out;
3. hydraulic pressure reaming is used, while so that whole stake holes hole wall is closely knit, since hydraulic pressure can select that less direction is hindered to transport It is dynamic, so that the compaction rate of whole stake holes hole wall is more uniformly spread, so that whole stake holes and the distribution of forces of pile body are uniform, reduce Situations such as pile body stress hour offset, inclination;
4. when so that squeezing soil layer with reaming, extruded soil layer is less compared to hidden pipe pile by drilling out pre- stake holes, reduce Soil layer extruding causes the case where influencing soil layer state near construction area, less to surrounding constructure influence;
5. by connecting several convex blocks in water bag outer wall, so that being formed in whole stake holes inner wall several recessed while ream operation Slot increases the frictional force of pile body and whole stake holes inner wall, improves pile body stability, reduces the degree that pile body drifts along.
Specific embodiment
Below with reference to embodiment, the present invention will be described in detail.
A kind of cast-in-place pile construction method, comprising the following steps:
(1) place flattens, specific as follows:
Construction area is flattened by bull-dozer, ground is flattened to being parallel to the horizontal plane, by roach accumulation transport to working area Domain simultaneously passes through truck transport with shipped off-site.
(2) it drills, specific as follows:
Twist bit vertical drilling hole is used to form pre- stake holes, the aperture of pre- stake holes is greater than the outer diameter of steel reinforcement cage and is less than design drawing The aperture of stake holes in paper, in the present embodiment, the aperture of pre- stake holes is specially 90% of the aperture of stake holes in design drawing, pre- stake holes Hole depth less than the hole depth of stake holes in design drawing, in the present embodiment, the hole depth of pre- stake holes is the hole depth of stake holes in design drawing 90%.
(3) reaming, specific as follows:
Hollow cylindrical water bag is put into pre- stake holes, the outer diameter of water bag is consistent with the aperture of stake holes in design drawing, The length of water bag is consistent with the depth of stake holes in design drawing, and water bag top circular face is communicated with water injection pipe, water bag top circular Face is fixedly connected with rigid plate, and rigid plate is circular slab, and the diameter of rigid plate is greater than the diameter of water bag, and rigid plate is provided with through-hole, Water injection pipe rushes through-hole and is pierced by.
Rigid plate is abutted on the ground, so that water bag top circular face is concordant with ground, is then placed by water pump Be connected in water tank and with water injection pipe, to connect water pressure gauge on water injection pipe towards filling the water in water bag, towards water bag in be filled to water pressure gauge After showing that hydraulic pressure is 1MPa, constant pressure stands 10 minutes, then sheds pressure, and the water in water bag is extracted out, rigid plate is then lifted out Water bag is detached pre- stake holes.
By high pressure water injection so as to restore cylindric after being pressurized inside water bag, due to stake in the outer diameter and design drawing of water bag Hole aperture is unanimously and the length of water bag is consistent with the hole depth of stake holes in design drawing, and the aperture of pre- stake holes is stake in design drawing The 90% of hole aperture, while the hole depth of pre- stake holes is 90% of stake holes hole depth in design drawing, so that water bag restores columned same When squeeze pre- stake holes inner wall and bottom to realize reaming, whole stake holes is formed after reaming, in the aperture and design drawing of whole stake holes The aperture of stake holes is consistent and the hole depth of whole stake holes is consistent with the hole depth of stake holes in design drawing.
(4) steel reinforcement cage is sunk to, specific as follows:
Steel reinforcement cage is lifted by crane by lifting machine, is then sunk in whole stake holes, during sinking to steel reinforcement cage, steel reinforcement cage and whole stake holes Aperture centering.
(5) it is poured concrete, specific as follows:
Concrete slurry is injected in whole stake holes by grouting pump, when injecting slurries, the vertical injection above steel reinforcement cage central axes, Avoid the active force of slurries lateral flow is excessive steel reinforcement cage is caused to deviate.
(6) pile crown is abolished, specific as follows:
After being poured concrete, after standing 28 days, pile crown is cleaved with pneumatic pick at pile crown graticule, with hydraulic cylinder pile jacking head side wall So that pile crown loosens, pile crown is lifted by crane to extract pile crown by lifting machine, completes the construction operation of bored concrete pile.
In the present embodiment, water bag is made of polyurethane material, and 10% carbon fiber is mixed in water bag, utilizes polyurethane material The wear-resisting and anti-characteristic punctured so that water bag be not easy to be punctured while being worn by soil it is less, by mixing 10% in water bag Carbon fiber reduces after being pressurized inside water bag water bag because self-strength deficiency causes deformation to destroy to further increase the intensity of water bag The case where.
Restore cylindric by water bag so that pre- stake holes hole wall and bottom hole are extruded so that the hole wall of whole stake holes and Bottom hole is in compact structure, and structural strength is big, and structural stability is high, while concrete slurry being made to be difficult to permeate, so that filling After infusing concrete slurry, concrete is greatly reduced through whole stake holes hole wall and bottom hole with the range infiltrated into neighbouring soil layer, Concrete is reduced to the pollution range of soil layer, simultaneously because the stable structure of whole stake holes hole wall, so that whole stake holes hole wall is stable The case where surrounding pile body, reducing pile body inclining, and due to the stable structure of whole stake holes bottom hole, so that whole stake holes bottom hole is stable Pile body is supported, the degree of pile body sedimentation is reduced.
By generating pressure in water bag, so that without apparent limitation when water bag deformation, so that water bag is less towards resistance Deformation occurs in direction, and then the extruding that the part for making hole wall loose is subject to the squeezing action of pre- stake holes hole wall by water bag is more It is more, so that the distribution of hole wall compactness is more uniform, so that whole stake holes hole wall is more stable.
By being 1MPa utilize the pre- stake holes hole wall of sufficiently large pressure extrusion, cooperation constant pressure towards the hydraulic pressure injected in water bag 10 minutes are stood, so that hole wall is adequately squeezed and is formed, guarantees the effect of reaming.
It is abutted on the ground by rigid plate, only need to limit rigid plate and move upwards, that is, can guarantee that water bag squeezes pre- stake holes The effect of bottom hole, it is easy to operate.
By by the aperture centering of steel reinforcement cage and whole stake holes, so that steel reinforcement cage is more equal respectively to the reinforcing effect of pile body It is even, improve the quality of bored concrete pile.
It uses water bag to squeeze pre- stake holes hole wall to completely cut off pre- stake holes hole wall and liquid using water bag, avoids being formed in pre- stake holes The case where mud, keeps pre- stake holes hole wall dry and comfortable and squeezes to form closely knit soil layer construction, so that the structure of whole stake holes hole wall High stability, while making to form negative pressure in water bag by the water in extraction water bag, water bag is squeezed by ambient pressure to shrink, So that there are spacing for water bag outer wall and whole stake holes hole wall, and then the friction of water bag and whole stake holes is reduced, so that water bag is easy to take out, It is easy to operate.
By first drilling out pre- stake holes, and the aperture of pre- stake holes is 90% of stake holes aperture in design drawing, so that squeezing soil layer When with reaming, extruded soil layer is less compared to hidden pipe pile, and reducing soil layer extruding causes to influence construction area soil layer shape nearby It is the case where state, less to surrounding constructure influence.
Embodiment 2
The difference from embodiment 1 is that before water bag is put into pre- stake holes, clump weight is first placed in water bag in step (3).
Increase water bag bottom heaviness by clump weight, is fallen by gravity drive water bag bottom towards pre- stake holes bottom hole, benefit The frictional force of water bag and pre- stake holes hole wall during overcoming water bag to be put into pre- stake holes with gravity, so that operation is more convenient.
Embodiment 3
The difference from example 2 is that the outer wall side wall of water bag is connected with several convex blocks, and convex block is evenly distributed in step (3) On water bag lateral wall, the spherical shape in the one end of convex block far from water bag, convex block is aluminium alloy, and carbon-fiber film is wrapped up outside convex block.
By water bag lateral wall connect convex block so that water bag restore it is cylindric to squeeze pre- stake holes hole wall when, convex block Pre- stake holes hole wall is got into, so that final whole stake holes hole wall forms several uniformly distributed grooves, so that after casting concrete, pile body Increase with the connection area of whole stake holes hole wall, and then improve the frictional force of pile body and whole stake holes hole wall, improves the stability of pile body, The case where reducing pile body sink-float.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications It should be regarded as protection scope of the present invention.

Claims (10)

1. a kind of cast-in-place pile construction method, it is characterized in that: the following steps are included:
(1) place flattens;
(2) it drills, specific as follows:
Drilling device vertical drilling hole is used to form pre- stake holes, the aperture of pre- stake holes is greater than the outer diameter of steel reinforcement cage and is less than design drawing The aperture of stake holes in paper;
(3) reaming, specific as follows:
Hollow cylindrical water bag is put into pre- stake holes, the outer diameter of water bag is consistent with the aperture of stake holes in design drawing, Water bag length is consistent with stake holes hole depth in design drawing, concordant with ground at the top of water bag and be communicated with water injection pipe, towards infusing in water bag Water to hydraulic pressure is greater than 1MPa, stands at least 10 minutes, pressure release draws water and takes out water bag to form whole stake holes;
(4) steel reinforcement cage is sunk to;
(5) casting concrete;
(6) pile crown is abolished.
2. cast-in-place pile construction method according to claim 1, it is characterized in that: the hole depth of pre- stake holes is few in the step (2) The hole depth of stake holes in design drawing.
3. cast-in-place pile construction method according to claim 2, it is characterized in that: in the step (2), the aperture of pre- stake holes is The 90% of the aperture of stake holes in design drawing.
4. cast-in-place pile construction method according to claim 3, it is characterized in that: in the step (2), the hole depth of pre- stake holes is The 90% of stake holes hole depth in design drawing.
5. cast-in-place pile construction method according to claim 1, it is characterized in that: water bag uses polyurethane in the step (3) Material is made, and 10% carbon fiber is mixed in water bag.
6. cast-in-place pile construction method according to claim 5, it is characterized in that: placing counterweight in water bag in the step (3) Block.
7. cast-in-place pile construction method according to claim 6, it is characterized in that: being connected at the top of water bag in the step (3) Rigid plate, rigid plate is provided with the through-hole being pierced by for water injection pipe, and after water bag is put into pre- stake holes, rigid plate is abutted on the ground.
8. cast-in-place pile construction method according to claim 1, it is characterized in that: in the step (4), when steel reinforcement cage is put into, By the aperture centering of steel reinforcement cage and whole stake holes.
9. cast-in-place pile construction method according to claim 1, it is characterized in that: in the step (3), the connection of water bag lateral wall There are several convex blocks.
10. cast-in-place pile construction method according to claim 9, it is characterized in that: several convex blocks are evenly distributed on water bag On lateral wall.
CN201810893323.6A 2018-08-07 2018-08-07 Cast-in-place pile construction method Pending CN108978640A (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111877322A (en) * 2020-05-26 2020-11-03 中建八局天津建设工程有限公司 Construction method of bored concrete cast-in-place pile

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JPS6424913A (en) * 1987-07-21 1989-01-26 Shimizu Construction Co Ltd Formation of expanded pit in ground
JP2002227194A (en) * 2001-02-02 2002-08-14 Ashimori Ind Co Ltd Bag body for cast-in-place pile and its installation method
CN202202325U (en) * 2011-08-25 2012-04-25 上海建工集团股份有限公司 Compacted and expanded micro mortar pile forming device
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Publication number Priority date Publication date Assignee Title
JPS61137912A (en) * 1984-12-11 1986-06-25 Asahi Chem Ind Co Ltd Formation of underground column using water semi-permeable cloth
JPS6424913A (en) * 1987-07-21 1989-01-26 Shimizu Construction Co Ltd Formation of expanded pit in ground
JP2002227194A (en) * 2001-02-02 2002-08-14 Ashimori Ind Co Ltd Bag body for cast-in-place pile and its installation method
CN202202325U (en) * 2011-08-25 2012-04-25 上海建工集团股份有限公司 Compacted and expanded micro mortar pile forming device
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Publication number Priority date Publication date Assignee Title
CN111877322A (en) * 2020-05-26 2020-11-03 中建八局天津建设工程有限公司 Construction method of bored concrete cast-in-place pile

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