CN111877322A - Construction method of bored concrete cast-in-place pile - Google Patents
Construction method of bored concrete cast-in-place pile Download PDFInfo
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- CN111877322A CN111877322A CN202010454971.9A CN202010454971A CN111877322A CN 111877322 A CN111877322 A CN 111877322A CN 202010454971 A CN202010454971 A CN 202010454971A CN 111877322 A CN111877322 A CN 111877322A
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- pile
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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
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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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
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a construction method of a bored concrete cast-in-place pile, which comprises the steps of leveling a field; drilling; reaming; sinking into a reinforcement cage; pouring concrete; and breaking the pile head. According to the invention, the hole diameter of the pre-pile hole is smaller than that of the pile hole in the design drawing, the air bag is utilized to restore the cylindrical shape and simultaneously extrude the hole wall of the pre-pile hole to expand the hole, so that the hole wall and the soil layer of the final pile hole are compact and stable in structure, and the gas can be directly discharged into the air, so that the method is convenient and simple, is convenient to realize and further improves the working efficiency; during pouring, the hole wall is of a compact structure, so that the range of concrete penetrating into a soil layer from the hole wall is greatly reduced, and the range of concrete polluting the soil layer is further reduced; according to the invention, the problem of deviation in the subsequent drilling process of the drill rod can be avoided by carrying out mortar cleaning and filling operation on the surface of the base layer, so that the problem of lengthened construction time caused by repeatedly adjusting the drill rod is avoided.
Description
Technical Field
The invention relates to the field of buildings, in particular to a construction method of a bored concrete cast-in-place pile.
Background
In the prior art, an envelope formed by cast-in-place bored piles is a common envelope, but in the construction process of the existing construction method of the cast-in-place bored concrete piles, the problem of drill rod deviation can occur in the specific drilling process because the construction process of cleaning the surface of a base layer is not available, so that the position of the drill rod needs to be adjusted, and the construction efficiency is affected. In addition, because the cast-in-place pile has no soil extrusion effect, the inner wall of the pile hole is relatively soft, when concrete is cast, a large amount of concrete permeates into gaps of soil layers on the inner wall of the pile hole, so that the range of the concrete polluting the soil layers is large, and the space for improving the soil layer is also provided.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a construction method of a bored concrete cast-in-place pile.
In order to achieve the purpose, the invention adopts the following technical scheme: a construction method of a bored concrete pile comprises the following steps:
(1) site leveling
The treatment operation of the surface of the base layer comprises cleaning mortar, filling holes and incomplete openings on the surface of the base layer, and measuring pile sites on a leveled field;
(2) drilling holes
According to the position of the pile to be measured, embedding the pile casing at a first preset position on the surface of the base layer and determining the central point of the pile casing; arranging a drilling machine at a second preset position on the surface of the base layer, enabling the central line of a drill rod of the drilling machine to coincide with the central point of the pile casing, and enabling the drill rod to move in the vertical direction by taking the central point of the pile casing as a starting point to drill a hole section so as to form a pre-pile hole, wherein the aperture of the pre-pile hole is larger than the outer diameter of the reinforcement cage and smaller than that of a pile hole in a design drawing;
(3) enlarging holes
Placing a hollow cylindrical air bag in the pre-pile hole, wherein the outer diameter of the air bag is 0.2-3 cm larger than the aperture of the pile hole in the design drawing, the length of the air bag is consistent with the depth of the pile hole in the design drawing, the top of the air bag is flush with the ground and is communicated with a gas injection pipe, a plurality of flow balls are contained in the air bag and used for vertically compacting the pre-pile hole, gas is injected into the air bag, the air bag is supported by the gas, the air bag is slowly enlarged, hole expansion is further realized, the air flow drives the flow balls to vertically compact the inner wall of the pre-pile hole, when the pressure in the air bag is 1.1 times of the air pressure, the air blowing is stopped, the air bag is kept stand for at least 20 minutes, and the gas in the;
(4) sinking into reinforcement cage
Hoisting a reinforcement cage in the pre-pile hole by using a gantry crane;
(5) pouring concrete;
pouring concrete into the pre-pile hole by using a guide pipe so as to seal the reinforcement cage in the concrete;
(6) and breaking the pile head.
And (2) after the concrete is solidified for a first preset time period, pulling the pile casing out of the surface of the base layer to form an annular mounting groove on the surface of the base layer for accommodating the pile casing.
In the step (2), the aperture of the pre-pile hole is 95% of the aperture of the pile hole in the design drawing.
In the step (2), the hole depth of the pre-pile hole is 96% of the hole depth of the pile hole in the design drawing.
In the step (2), marking a first preset position on the surface of the base layer, and carrying out density detection on the soil body at the first preset position; embedding the protective cylinder at a first preset position by at least one of pressurization, vibration and hammering; wherein, one end of the protective cylinder is 20cm to 30cm higher than the surface of the base layer.
In the step (3), a plurality of steel arc-shaped pressing plates are arranged on the outer side wall of the air bag and used for enabling the inner wall of the pre-pile hole to be pre-piled
And (4) smoothing.
And (5) conveying cement paste into the annular mounting groove through a grouting pipe to fill the annular mounting groove.
The invention has the beneficial effects that: according to the invention, the hole diameter of the pre-pile hole is smaller than that of the pile hole in the design drawing, the air bag is utilized to restore the cylindrical shape and simultaneously extrude the hole wall of the pre-pile hole to expand the hole, so that the hole wall and the soil layer of the final pile hole are compact and stable in structure, and the gas can be directly discharged into the air, so that the method is convenient and simple, is convenient to realize and further improves the working efficiency; during pouring, the hole wall is of a compact structure, so that the range of concrete penetrating into a soil layer from the hole wall is greatly reduced, and the range of concrete polluting the soil layer is further reduced; according to the invention, the problem of deviation in the subsequent drilling process of the drill rod can be avoided by carrying out mortar cleaning and filling operation on the surface of the base layer, so that the problem of lengthened construction time caused by repeatedly adjusting the drill rod is avoided.
Detailed Description
The invention will be further illustrated with reference to specific examples: a construction method of a bored concrete pile comprises the following steps:
(1) site leveling
The treatment operation of the surface of the base layer comprises cleaning mortar, filling holes and incomplete openings on the surface of the base layer, and measuring pile sites on a leveled field;
(2) drilling holes
According to the position of the pile to be measured, embedding the pile casing at a first preset position on the surface of the base layer and determining the central point of the pile casing; arranging a drilling machine at a second preset position on the surface of the base layer, enabling the central line of a drill rod of the drilling machine to coincide with the central point of the pile casing, and enabling the drill rod to move in the vertical direction by taking the central point of the pile casing as a starting point to drill a hole section so as to form a pre-pile hole, wherein the aperture of the pre-pile hole is larger than the outer diameter of the reinforcement cage and smaller than that of a pile hole in a design drawing;
(3) enlarging holes
Placing a hollow cylindrical air bag in the pre-pile hole, wherein the outer diameter of the air bag is 0.2-3 cm larger than the aperture of the pile hole in the design drawing, the length of the air bag is consistent with the depth of the pile hole in the design drawing, the top of the air bag is flush with the ground and is communicated with a gas injection pipe, a plurality of flow balls are contained in the air bag and used for vertically compacting the pre-pile hole, gas is injected into the air bag, the air bag is supported by the gas, the air bag is slowly enlarged, hole expansion is further realized, the air flow drives the flow balls to vertically compact the inner wall of the pre-pile hole, when the pressure in the air bag is 1.1 times of the air pressure, the air blowing is stopped, the air bag is kept stand for at least 20 minutes, and the gas in the;
(4) sinking into reinforcement cage
Hoisting a reinforcement cage in the pre-pile hole by using a gantry crane;
(5) pouring concrete;
pouring concrete into the pre-pile hole by using a guide pipe so as to seal the reinforcement cage in the concrete;
(6) and breaking the pile head.
And (2) after the concrete is solidified for a first preset time period, pulling the pile casing out of the surface of the base layer to form an annular mounting groove on the surface of the base layer for accommodating the pile casing.
In the step (2), the aperture of the pre-pile hole is 95% of the aperture of the pile hole in the design drawing.
In the step (2), the hole depth of the pre-pile hole is 96% of the hole depth of the pile hole in the design drawing.
In the step (2), marking a first preset position on the surface of the base layer, and carrying out density detection on the soil body at the first preset position; embedding the protective cylinder at a first preset position by at least one of pressurization, vibration and hammering; wherein, one end of the protective cylinder is 20cm to 30cm higher than the surface of the base layer.
In the step (3), a plurality of steel arc-shaped pressing plates are arranged on the outer side wall of the air bag and used for enabling the inner wall of the pre-pile hole to be pre-piled
And (4) smoothing.
And (5) conveying cement paste into the annular mounting groove through a grouting pipe to fill the annular mounting groove.
Example 1
A construction method of a bored concrete pile comprises the following steps:
(1) site leveling
The treatment operation of the surface of the base layer comprises cleaning mortar, filling holes and incomplete openings on the surface of the base layer, and measuring pile sites on a leveled field;
(2) drilling holes
According to the position of the pile to be measured, embedding the pile casing at a first preset position on the surface of the base layer and determining the central point of the pile casing; arranging a drilling machine at a second preset position on the surface of the base layer, enabling the central line of a drill rod of the drilling machine to coincide with the central point of the pile casing, and enabling the drill rod to move in the vertical direction by taking the central point of the pile casing as a starting point to drill a hole section so as to form a pre-pile hole, wherein the aperture of the pre-pile hole is larger than the outer diameter of the reinforcement cage and smaller than that of a pile hole in a design drawing;
(3) enlarging holes
Placing a hollow cylindrical air bag in the pre-pile hole, wherein the outer diameter of the air bag is 0.2 cm larger than the aperture of the pile hole in the design drawing, the length of the air bag is consistent with the depth of the pile hole in the design drawing, the top of the air bag is flush with the ground and is communicated with a gas injection pipe, a plurality of flow balls are placed in the air bag and used for vertically compacting the pre-pile hole, pumping gas into the air bag, the gas supports the air bag, the air bag slowly grows, and further hole expansion is realized, because the air bag is continuously inflated, the air flow drives the flow balls to vertically compact the inner wall of the pre-pile hole, when the pressure in the air bag is 1.1 times of the air pressure, stopping blowing, standing for at least 20 minutes, and discharging the gas in the air bag;
(4) sinking into reinforcement cage
Hoisting a reinforcement cage in the pre-pile hole by using a gantry crane;
(5) pouring concrete;
pouring concrete into the pre-pile hole by using a guide pipe so as to seal the reinforcement cage in the concrete;
(6) and breaking the pile head.
And (2) after the concrete is solidified for a first preset time period, pulling the pile casing out of the surface of the base layer to form an annular mounting groove on the surface of the base layer for accommodating the pile casing.
In the step (2), the aperture of the pre-pile hole is 95% of the aperture of the pile hole in the design drawing.
In the step (2), the hole depth of the pre-pile hole is 96% of the hole depth of the pile hole in the design drawing.
In the step (2), marking a first preset position on the surface of the base layer, and carrying out density detection on the soil body at the first preset position; embedding the protective cylinder at a first preset position by at least one of pressurization, vibration and hammering; wherein, one end of the protective cylinder is 20cm to 30cm higher than the surface of the base layer.
In the step (3), a plurality of steel arc-shaped pressing plates are arranged on the outer side wall of the air bag and used for enabling the inner wall of the pre-pile hole to be pre-piled
And (4) smoothing.
And (5) conveying cement paste into the annular mounting groove through a grouting pipe to fill the annular mounting groove.
Example 2
A construction method of a bored concrete pile comprises the following steps:
(1) site leveling
The treatment operation of the surface of the base layer comprises cleaning mortar, filling holes and incomplete openings on the surface of the base layer, and measuring pile sites on a leveled field;
(2) drilling holes
According to the position of the pile to be measured, embedding the pile casing at a first preset position on the surface of the base layer and determining the central point of the pile casing; arranging a drilling machine at a second preset position on the surface of the base layer, enabling the central line of a drill rod of the drilling machine to coincide with the central point of the pile casing, and enabling the drill rod to move in the vertical direction by taking the central point of the pile casing as a starting point to drill a hole section so as to form a pre-pile hole, wherein the aperture of the pre-pile hole is larger than the outer diameter of the reinforcement cage and smaller than that of a pile hole in a design drawing;
(3) enlarging holes
Placing a hollow cylindrical air bag in the pre-pile hole, wherein the outer diameter of the air bag is 3 cm larger than the aperture of the pile hole in the design drawing, the length of the air bag is consistent with the depth of the pile hole in the design drawing, the top of the air bag is flush with the ground and is communicated with a gas injection pipe, a plurality of flow balls are placed in the air bag and used for vertically compacting the pre-pile hole, and gas is pumped into the air bag to support the air bag, so that the air bag is slowly enlarged, and further hole expansion is realized, because the air bag is continuously inflated, the air flow drives the flow balls to vertically compact the inner wall of the pre-pile hole, when the pressure in the air bag is 1.1 times of the air pressure, the air blowing is stopped, the air bag is kept stand for at least;
(4) sinking into reinforcement cage
Hoisting a reinforcement cage in the pre-pile hole by using a gantry crane;
(5) pouring concrete;
pouring concrete into the pre-pile hole by using a guide pipe so as to seal the reinforcement cage in the concrete;
(6) and breaking the pile head.
And (2) after the concrete is solidified for a first preset time period, pulling the pile casing out of the surface of the base layer to form an annular mounting groove on the surface of the base layer for accommodating the pile casing.
In the step (2), the aperture of the pre-pile hole is 95% of the aperture of the pile hole in the design drawing.
In the step (2), the hole depth of the pre-pile hole is 96% of the hole depth of the pile hole in the design drawing.
In the step (2), marking a first preset position on the surface of the base layer, and carrying out density detection on the soil body at the first preset position; embedding the protective cylinder at a first preset position by at least one of pressurization, vibration and hammering; wherein, one end of the protective cylinder is 20cm to 30cm higher than the surface of the base layer.
In the step (3), a plurality of steel arc-shaped pressing plates are arranged on the outer side wall of the air bag and used for enabling the inner wall of the pre-pile hole to be pre-piled
And (4) smoothing.
And (5) conveying cement paste into the annular mounting groove through a grouting pipe to fill the annular mounting groove.
Example 3
A construction method of a bored concrete pile comprises the following steps:
(1) site leveling
The treatment operation of the surface of the base layer comprises cleaning mortar, filling holes and incomplete openings on the surface of the base layer, and measuring pile sites on a leveled field;
(2) drilling holes
According to the position of the pile to be measured, embedding the pile casing at a first preset position on the surface of the base layer and determining the central point of the pile casing; arranging a drilling machine at a second preset position on the surface of the base layer, enabling the central line of a drill rod of the drilling machine to coincide with the central point of the pile casing, and enabling the drill rod to move in the vertical direction by taking the central point of the pile casing as a starting point to drill a hole section so as to form a pre-pile hole, wherein the aperture of the pre-pile hole is larger than the outer diameter of the reinforcement cage and smaller than that of a pile hole in a design drawing;
(3) enlarging holes
Placing a hollow cylindrical air bag in the pre-pile hole, wherein the outer diameter of the air bag is 1 cm larger than the aperture of the pile hole in the design drawing, the length of the air bag is consistent with the depth of the pile hole in the design drawing, the top of the air bag is flush with the ground and is communicated with a gas injection pipe, a plurality of flow balls are placed in the air bag and used for vertically compacting the pre-pile hole, and gas is pumped into the air bag to support the air bag, so that the air bag is slowly enlarged, and further hole expansion is realized, because the air bag is continuously inflated, the air flow drives the flow balls to vertically compact the inner wall of the pre-pile hole, when the pressure in the air bag is 1.1 times of the air pressure, the air blowing is stopped, the air bag is kept stand for at least;
(4) sinking into reinforcement cage
Hoisting a reinforcement cage in the pre-pile hole by using a gantry crane;
(5) pouring concrete;
pouring concrete into the pre-pile hole by using a guide pipe so as to seal the reinforcement cage in the concrete;
(6) and breaking the pile head.
And (2) after the concrete is solidified for a first preset time period, pulling the pile casing out of the surface of the base layer to form an annular mounting groove on the surface of the base layer for accommodating the pile casing.
In the step (2), the aperture of the pre-pile hole is 95% of the aperture of the pile hole in the design drawing.
In the step (2), the hole depth of the pre-pile hole is 96% of the hole depth of the pile hole in the design drawing.
In the step (2), marking a first preset position on the surface of the base layer, and carrying out density detection on the soil body at the first preset position; embedding the protective cylinder at a first preset position by at least one of pressurization, vibration and hammering; wherein, one end of the protective cylinder is 20cm to 30cm higher than the surface of the base layer.
In the step (3), a plurality of steel arc-shaped pressing plates are arranged on the outer side wall of the air bag and used for enabling the inner wall of the pre-pile hole to be pre-piled
And (4) smoothing.
And (5) conveying cement paste into the annular mounting groove through a grouting pipe to fill the annular mounting groove.
The present invention has been described in connection with the specific embodiments, and it is obvious that the specific implementation of the present invention is not limited by the above-mentioned manner, and it is within the protection scope of the present invention as long as various modifications are made by using the method concept and technical solution of the present invention, or the present invention is directly applied to other occasions without modification.
Claims (7)
1. A construction method of a bored concrete pile is characterized by comprising the following steps:
(1) site leveling
The treatment operation of the surface of the base layer comprises cleaning mortar, filling holes and incomplete openings on the surface of the base layer, and measuring pile sites on a leveled field;
(2) drilling holes
According to the position of the pile to be measured, embedding the pile casing at a first preset position on the surface of the base layer and determining the central point of the pile casing; arranging a drilling machine at a second preset position on the surface of the base layer, enabling the central line of a drill rod of the drilling machine to coincide with the central point of the pile casing, and enabling the drill rod to move in the vertical direction by taking the central point of the pile casing as a starting point to drill a hole section so as to form a pre-pile hole, wherein the aperture of the pre-pile hole is larger than the outer diameter of the reinforcement cage and smaller than that of a pile hole in a design drawing;
(3) enlarging holes
Placing a hollow cylindrical air bag in the pre-pile hole, wherein the outer diameter of the air bag is 0.2-3 cm larger than the aperture of the pile hole in the design drawing, the length of the air bag is consistent with the depth of the pile hole in the design drawing, the top of the air bag is flush with the ground and is communicated with a gas injection pipe, a plurality of flow balls are contained in the air bag and used for vertically compacting the pre-pile hole, gas is injected into the air bag, the air bag is supported by the gas, the air bag is slowly enlarged, hole expansion is further realized, the air flow drives the flow balls to vertically compact the inner wall of the pre-pile hole, when the pressure in the air bag is 1.1 times of the air pressure, the air blowing is stopped, the air bag is kept stand for at least 20 minutes, and the gas in the;
(4) sinking into reinforcement cage
Hoisting a reinforcement cage in the pre-pile hole by using a gantry crane;
(5) pouring concrete;
pouring concrete into the pre-pile hole by using a guide pipe so as to seal the reinforcement cage in the concrete;
(6) and breaking the pile head.
2. The method of constructing a bored concrete pile according to claim 1, wherein in the step (2), after the concrete is set for a first predetermined period of time, the casing is pulled out from the surface of the base layer to form an annular installation groove on the surface of the base layer for receiving the casing.
3. The method for constructing a bored concrete pile according to claim 1, wherein in the step (2), the diameter of the pre-pile hole is 95% of the diameter of the pile hole in the design drawing.
4. The method for constructing a bored concrete pile according to claim 1, wherein in the step (2), the depth of the pre-pile hole is 96% of the depth of the pile hole in the design drawing.
5. The construction method of the bored concrete pile according to claim 1, wherein in the step (2), a first preset position is marked on the surface of the base layer, and density detection is performed on a soil body at the first preset position; embedding the protective cylinder at a first preset position by at least one of pressurization, vibration and hammering; wherein, one end of the protective cylinder is 20cm to 30cm higher than the surface of the base layer.
6. The method for constructing a bored concrete pile according to claim 1, wherein in the step (3), the outer side wall of the air bag is provided with a plurality of steel-made arc-shaped pressing plates for smoothing the inner wall of the pre-pile hole.
7. The method for constructing a bored concrete pile according to claim 1, wherein in the step (5), cement paste is supplied into the annular installation groove through the grout pipe to fill the annular installation groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010454971.9A CN111877322A (en) | 2020-05-26 | 2020-05-26 | Construction method of bored concrete cast-in-place pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010454971.9A CN111877322A (en) | 2020-05-26 | 2020-05-26 | Construction method of bored concrete cast-in-place pile |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106759288A (en) * | 2016-11-29 | 2017-05-31 | 昆山顶牛市政建设有限公司 | One kind building bored pile construction method |
| CN108978640A (en) * | 2018-08-07 | 2018-12-11 | 佛山市房建集团有限公司 | Cast-in-place pile construction method |
| CN110387880A (en) * | 2019-07-29 | 2019-10-29 | 中铁十二局集团建筑安装工程有限公司 | A kind of bored pile construction method |
-
2020
- 2020-05-26 CN CN202010454971.9A patent/CN111877322A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106759288A (en) * | 2016-11-29 | 2017-05-31 | 昆山顶牛市政建设有限公司 | One kind building bored pile construction method |
| CN108978640A (en) * | 2018-08-07 | 2018-12-11 | 佛山市房建集团有限公司 | Cast-in-place pile construction method |
| CN110387880A (en) * | 2019-07-29 | 2019-10-29 | 中铁十二局集团建筑安装工程有限公司 | A kind of bored pile construction method |
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Application publication date: 20201103 |
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