CN110670584A - Cast-in-situ bored pile and construction method thereof - Google Patents
Cast-in-situ bored pile and construction method thereof Download PDFInfo
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- CN110670584A CN110670584A CN201910837349.3A CN201910837349A CN110670584A CN 110670584 A CN110670584 A CN 110670584A CN 201910837349 A CN201910837349 A CN 201910837349A CN 110670584 A CN110670584 A CN 110670584A
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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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- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a cast-in-situ bored pile and a construction method thereof, which are applied to a geological environment with a sludge layer.
Description
Technical Field
The invention relates to the technical field of pile foundation construction, in particular to a construction method of a cast-in-situ bored pile applied to a sludge layer environment.
Background
The cast-in-situ bored pile is an important pile foundation in building engineering and bridge engineering, and in the construction process, firstly, a pile hole is dug in a mechanical hole forming or manual hole forming mode, and then a reinforcement cage is installed, and finally concrete is poured. The cast-in-situ bored pile is subdivided into an end-bearing pile and a friction pile in a stressed manner. When the construction is carried out in a thick silt layer geological environment, if friction piles are adopted, deep pile holes are needed; if end-bearing piles are used, the length of the pile hole entering the bedrock should also be more than twice the diameter of the pile. In addition, the difficulty of pile construction operation in a coastal area or in a wet land and other environments with thick sludge layers is high, firstly, mechanical equipment is difficult to normally position, and when concrete is poured after hole forming, the phenomenon of necking and expanding is easily generated at the position of the sludge layer, so that the construction quality of the cast-in-situ bored pile is seriously influenced, meanwhile, the waste of concrete is also caused, and the construction cost is increased.
Disclosure of Invention
The present invention is made to solve the above-mentioned technical problems, and an object of the present invention is to provide a method for constructing a cast-in-situ bored pile, which can reduce construction cost and increase construction speed while ensuring construction quality.
In order to achieve the purpose, the invention provides a cast-in-situ bored pile, which is applied to a geological environment with a sludge layer and comprises a pile reinforcement cage and concrete poured in a pile hole, wherein a plurality of sections of round pipes are sleeved on the pile reinforcement cage, a plurality of positioning blocks are arranged on the inner wall of each round pipe along the length direction, and the round pipes are connected with the pile reinforcement cage through the positioning blocks.
Furthermore, the round pipe is a cement round pipe.
Furthermore, the positioning block is a steel plate embedded part embedded in the cement round pipe, and the steel plate embedded part is welded with a positioning rib arranged on the pile steel reinforcement cage.
Furthermore, the inner wall of the cement round pipe reaches the distance of the pile steel reinforcement cage plus the thickness of the pipe wall of the cement round pipe is equal to the thickness of the cement protective layer of the pile steel reinforcement cage.
Furthermore, a steel wire mesh is arranged in the pipe wall of the cement round pipe, the diameter of a steel wire of the steel wire mesh is 3mm, and the size of a grid of the steel wire mesh is 5cm multiplied by 5 cm.
Furthermore, the thickness of the pipe wall of the round pipe is within the range of 3 cm-7 cm.
Further, the length of the circular tube is within the range of 2m to 10 m.
Furthermore, all the sections of round pipes are connected together through tongue-and-groove joints.
Furthermore, the round pipe is arranged at the position of the pile reinforcement cage on the sludge layer.
On the other hand, the invention also provides a construction method of the cast-in-situ bored pile, which adopts the cast-in-situ bored pile and comprises the following steps:
s1: carrying out construction lofting on the pile position to determine the center of the pile position and the circumferential line of the pile position;
s2: paving roadbed box plates around the pile position to form a construction platform around the pile position;
s3: installing a drilling machine on the construction platform, performing drilling operation to form a pile hole, and then cleaning sludge and residues in the pile hole;
s4: manufacturing a pile reinforcement cage, and installing a circular pipe on the part of the reinforcement cage, which is positioned on the sludge layer, according to a geological structure diagram;
s5: installing a pile reinforcement cage with a circular pipe into the pile hole;
s6: cleaning residual silt and residue in the pile hole;
s7: and continuously pouring concrete into the pile hole.
According to the above description and practice, the cast-in-situ bored pile of the present invention has the advantages that the pile reinforcement cage is sleeved with the plurality of sections of the circular pipes which are butted together at the position of the sludge layer, and the pile hole is separated from the sludge layer by the circular pipes, so that the sludge cannot flow into the pile hole, and the necking phenomenon is avoided; meanwhile, concrete in the pile hole can not flow into the sludge layer, so that the expanding phenomenon is avoided, and the quality of the cast-in-situ bored pile is improved. By utilizing the circular tube and the construction method of the cast-in-situ bored pile, the construction of the pile in the geological environment of the sludge layer can be quickly completed, the construction cost is reduced, and the construction quality is improved.
Drawings
Fig. 1 is a schematic diagram of a cast-in-situ bored pile according to an embodiment of the present invention.
Fig. 2 is a schematic view of a bored pile according to an embodiment of the present invention, partially in section.
Fig. 3 is a schematic plan view of a construction platform involved in an embodiment of the invention.
Fig. 4 is a schematic flow chart of a method of constructing a cast-in-situ bored pile according to an embodiment of the present invention.
In the figure: 1. the construction method comprises the following steps of (1) filling a mixed soil layer, 2) a silt layer, 3, a strongly weathered rock stratum, 4, an intermediate weathered rock stratum, 5, a slightly weathered rock stratum, 6, a pile reinforcement cage, 7, a cement circular tube, 8, a steel plate embedded part, 9, a construction platform, 10 and a positioning rib;
71. concave part, 72, convex part.
Detailed Description
Embodiments of a cast-in-situ bored pile and a construction method thereof according to the present invention will be described below with reference to the accompanying drawings. Those of ordinary skill in the art will recognize that the described embodiments can be modified in various different ways, without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not to scale and like reference numerals refer to like parts.
Example one
Fig. 1 is a schematic diagram of a cast-in-situ bored pile according to an embodiment of the present invention. In this embodiment, the cast-in-situ bored pile is an end-bearing pile with a diameter of 2 meters and a length of 40 meters, and the ground water level is below the bottom of the pile. The figure is sequentially from top to bottom: the miscellaneous fill layer is 1, and the thickness is 2 meters; a sludge layer 2 with a thickness of 20 meters; 3, the thickness of the strongly weathered rock stratum is 3 meters; the thickness of the medium weathered rock stratum is 4 meters; slightly weathered rock formation 5, 12 meters thick. Fig. 2 is a schematic view of a bored pile according to an embodiment of the present invention, partially in section. Fig. 2 shows the section structure of a water-saving mud round pipe and the structure of a pile reinforcement cage at the position of the water-saving mud round pipe.
Referring to fig. 1 and 2, the cast-in-situ bored pile of the present invention includes a pile reinforcement cage 6 and concrete poured in the pile hole, wherein a plurality of circular pipes are sleeved on the pile reinforcement cage 6, a plurality of positioning blocks are arranged on an inner wall of each circular pipe along a longitudinal direction, and the circular pipes are connected with the pile reinforcement cage through the positioning blocks.
Specifically, in this embodiment, the pipe that the cover was established on stake steel reinforcement cage 6 is cement pipe 7, and this cement pipe's length is 8 meters, and the external diameter is 2 meters, and wall thickness 5 centimetres is provided with the wire net of tube-shape in the pipe wall to strengthen the intensity of cement pipe, the distance of this wire net apart from 7 outer walls of cement pipe is 15 millimeters. The cement label of the cement round pipe 7 is the same as that of the cast-in-situ bored pile. The locating piece that sets up along the length direction in this cement pipe 7's pipe wall is steel sheet built-in fitting 8, in this embodiment, steel sheet built-in fitting 8 is banding arc, one of them side is stretched out the inner wall of cement pipe or is kept level with the inner wall of cement pipe, and be provided with location muscle 10 with the position department that steel sheet built-in fitting 8 corresponds on stake steel reinforcement cage 6, the one end welding of location muscle 10 is on the main muscle of stake steel reinforcement cage, the other end welding is on steel sheet built-in fitting 8, thereby make cement pipe 7 link together with stake steel reinforcement cage 6. It should be noted that the inner wall of the cement circular tube 7 reaches the distance of the pile steel reinforcement cage 6 plus the thickness of the wall of the cement circular tube is equal to the thickness of the cement protective layer of the pile steel reinforcement cage.
In this example, the mesh size of the steel wire mesh is 5cm × 5cm, and the diameter of the steel wire is 3 mm. The circular cement pipe water-saving device is characterized in that all circular cement pipes are butted together through a tongue-and-groove, specifically, a convex part 72 is arranged at one end of the circular cement pipe 7 along the length direction, a concave part 71 is arranged at the other end of the circular cement pipe 7 along the length direction, and the two circular cement pipes are butted through overlapping and buckling of the convex part 72 and the concave part 71. The cement circular pipes can be prefabricated by a centrifugal method, and the length and the number of the cement circular pipes are determined according to the thickness of a sludge layer at the position of a pile. By butting and welding the circular water-saving mud pipes on the positions, positioned on the mud layer, of the pile reinforcement cage, the mud can be prevented from flowing into the pile holes when concrete is poured, so that the phenomenon of necking is avoided; and simultaneously, the concrete is prevented from flowing to a sludge layer, so that the expansion phenomenon is avoided.
Example two
Fig. 3 is a schematic plan view of a construction platform involved in an embodiment of the invention. Fig. 4 is a schematic flow chart of a method of constructing a cast-in-situ bored pile according to an embodiment of the present invention.
In this embodiment, a construction method of a cast-in-situ bored pile according to the first embodiment is described, which mainly includes the following steps:
step S1: and (5) performing construction lofting on the pile position to determine the center of the pile position and the circumferential line of the pile position.
Step S2: and paving roadbed box plates around the pile position to form a construction platform 9 around the pile position. The construction platform 9 is composed of a steel structure framework inserted in a sludge layer and roadbed box plates on the upper portion, and each roadbed box plate is connected together through a hinge. The middle of the construction platform 9 is a position of a pile hole, one side edge of the construction platform 9 extends outwards to form a passage which leads to the outside hard ground for personnel and materials to enter and exit.
Step S3: and (3) installing a drilling machine on the construction platform 9, performing drilling operation to form a pile hole, and then cleaning sludge and residues in the pile hole.
Step S4: and manufacturing a pile reinforcement cage 6 and a cement round pipe 7 in the first embodiment. And according to the geological structure diagram, welding the circular cement pipe 7 at the part of the pile reinforcement cage 6, which is positioned on the sludge layer.
Step S5: and (3) installing the pile reinforcement cage with the cement round pipe into the pile hole, and separating the sludge layer from the pile hole by the cement round pipe 7 at the moment so that the sludge does not flow into the pile hole any more.
Step S6: and (4) cleaning residual silt and residues in the pile hole, adjusting the position of the pile reinforcement cage, and performing subsequent construction after checking that the pile reinforcement cage is correct.
Step S7: and continuously pouring concrete into the pile hole, and completing the construction of the cast-in-situ bored pile.
It should be noted that the upper end of the pile reinforcement cage of the cast-in-situ bored pile needs to extend 50cm to 100cm beyond the end face of the pile to serve as an anchoring rib of the upper bearing platform.
The construction method of the cast-in-situ bored pile provided by the embodiment can prevent sludge from flowing into the pile hole, avoid necking, prevent concrete from flowing into the sludge layer, and avoid expanding. The construction progress is accelerated, and the construction cost is reduced.
A cast-in-situ bored pile and a construction method thereof according to the present invention are described above by way of example with reference to the accompanying drawings. However, it should be understood by those skilled in the art that various modifications may be made to the method for constructing a cast-in-situ bored pile according to the present invention without departing from the scope of the present invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (10)
1. The cast-in-situ bored pile is applied to geological environment with a silt layer and comprises a pile steel reinforcement cage and concrete poured in a pile hole.
2. A bored pile according to claim 1, wherein the tubular is a cement tubular.
3. The cast-in-situ bored pile according to claim 2, wherein the positioning block is a steel plate embedded part embedded in the cement round pipe, and the steel plate embedded part is welded to a positioning rib provided on the pile reinforcement cage.
4. The bored pile according to claim 3, wherein the distance from the inner wall of the cement round tube to the pile reinforcement cage plus the thickness of the wall of the cement round tube is equal to the thickness of the cement protective layer of the pile reinforcement cage.
5. A bored pile according to claim 2, wherein a steel wire mesh is arranged in the wall of the cement round pipe, the diameter of the steel wire mesh is 3mm, and the mesh size of the steel wire mesh is 5cm x 5 cm.
6. The cast-in-situ bored pile according to claims 1 to 5, wherein the circular tube has a tube wall thickness in a range of 3cm to 7 cm.
7. Cast-in-situ bored pile according to claims 1 to 5, wherein the length of the circular tube is in the range of 2m to 10 m.
8. Cast-in-situ bored pile according to claims 1 to 5, wherein the respective lengths of round tubes are connected together by tongue-and-groove joints.
9. A bored pile according to claims 1 to 5, wherein said circular tube is provided at a portion of the pile reinforcement cage located at the sludge layer.
10. A cast-in-situ bored pile construction method using the cast-in-situ bored pile according to any one of claims 1 to 9, comprising the steps of:
s1: carrying out construction lofting on the pile position to determine the center of the pile position and the circumferential line of the pile position;
s2: paving roadbed box plates around the pile position to form a construction platform around the pile position;
s3: installing a drilling machine on the construction platform, performing drilling operation to form a pile hole, and then cleaning sludge and residues in the pile hole;
s4: manufacturing a pile reinforcement cage, and installing a circular pipe on the part of the reinforcement cage, which is positioned on the sludge layer, according to a geological structure diagram;
s5: installing a pile reinforcement cage with a circular pipe into the pile hole;
s6: cleaning residual silt and residue in the pile hole;
s7: and continuously pouring concrete into the pile hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910837349.3A CN110670584A (en) | 2019-09-05 | 2019-09-05 | Cast-in-situ bored pile and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910837349.3A CN110670584A (en) | 2019-09-05 | 2019-09-05 | Cast-in-situ bored pile and construction method thereof |
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| CN110670584A true CN110670584A (en) | 2020-01-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111501737A (en) * | 2020-04-16 | 2020-08-07 | 中国电建集团华东勘测设计研究院有限公司 | Reinforced cast-in-situ bored pile and construction method thereof |
| CN113668515A (en) * | 2021-08-23 | 2021-11-19 | 广州东宇王建筑工程有限公司 | Rotary drilling cast-in-place pile and construction process thereof |
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| CN208293569U (en) * | 2018-02-06 | 2018-12-28 | 中铁上海工程局集团有限公司 | A kind of anti-collapse aperture apparatus of cast-in-situ bored pile |
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| CN1244615A (en) * | 1999-09-01 | 2000-02-16 | 金怀娄 | Pile foundation of high-pressure rotatively sprayed reinforced concrete in triple pipe and its concretion method |
| CN1314527A (en) * | 2000-03-16 | 2001-09-26 | 金怀娄 | High pressure rotary spray multifunction structure pile foundation method |
| CN1609346A (en) * | 2003-10-20 | 2005-04-27 | 胡柏英 | Superposed pile structure and construction method |
| CN2719915Y (en) * | 2004-08-10 | 2005-08-24 | 山东省机械施工公司 | Hollow artificial hole-digging bored concrete pile |
| CN101545256A (en) * | 2008-03-28 | 2009-09-30 | 中铁十三局集团第三工程有限公司 | Method for treating collapsed holes of bored piles by protective cylinder of steel reinforcement cage under geological conditions of silt stratification |
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| CN111501737A (en) * | 2020-04-16 | 2020-08-07 | 中国电建集团华东勘测设计研究院有限公司 | Reinforced cast-in-situ bored pile and construction method thereof |
| CN111501737B (en) * | 2020-04-16 | 2022-03-18 | 中国电建集团华东勘测设计研究院有限公司 | Reinforced cast-in-situ bored pile and construction method thereof |
| CN113668515A (en) * | 2021-08-23 | 2021-11-19 | 广州东宇王建筑工程有限公司 | Rotary drilling cast-in-place pile and construction process thereof |
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