LU502585B1 - Prefabricated pipe pile suitable for soft soil stratum to effectively enhance bearing capacity and construction method thereof - Google Patents
Prefabricated pipe pile suitable for soft soil stratum to effectively enhance bearing capacity and construction method thereof Download PDFInfo
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- LU502585B1 LU502585B1 LU502585A LU502585A LU502585B1 LU 502585 B1 LU502585 B1 LU 502585B1 LU 502585 A LU502585 A LU 502585A LU 502585 A LU502585 A LU 502585A LU 502585 B1 LU502585 B1 LU 502585B1
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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
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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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
- E02D5/24—Prefabricated piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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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
- E02D5/74—Means for anchoring structural elements or bulkheads
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/20—Placing by pressure or pulling power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The present invention relates to a prefabricated pipe pile suitable for a soft soil stratum to effectively enhance bearing capacity and a construction method thereof. The prefabricated pipe pile includes a pile cap, a prefabricated pipe pile body, and a pile tip. A side surface of the prefabricated pipe pile body is provided with a plurality of rows of through grooves along an axial direction of the prefabricated pipe pile body, and the through grooves penetrate a wall of the prefabricated pipe pile body; the prefabricated pipe pile includes: soil-extruding units arranged in each of the through grooves, wherein one ends of the soil-extruding units located inside the prefabricated pipe pile body are provided with chamfer surfaces, and a plurality of soil-extruding units in a same row are connected to each other by a connection structure that is detachable under an external force; a suspender arranged at an inner bottom end of the prefabricated pipe pile body; and a steel wire rope, one end of which is connected with the suspender, and another end of which is connected with a barb on the pile cap; wherein a top end of the suspender is capable of piercing the connection structure, and squeezing the soil-extruding units into soil outside the prefabricated pipe pile body, when the steel wire rope lifts the suspender to move upwards inside the prefabricated pipe pile body. According to the present invention, the vertical bearing capacity and the anti-pulling capacity of the prefabricated pipe pile are increased on the premise of the constant pile diameter and the constant pile length.
Description
! LU502585
PREFABRICATED PIPE PILE SUITABLE FOR SOFT SOIL STRATUM TO
EFFECTIVELY ENHANCE BEARING CAPACITY AND CONSTRUCTION
METHOD THEREOF
[0001] The present invention relates to the field of foundation reinforcement engineering, and in particular to a prefabricated pipe pile suitable for a soft soil stratum to effectively enhance bearing capacity and a construction method thereof.
[0002] The present invention relates to a field of pile foundations, and in particular to a prefabricated pipe pile suitable for a soft soil stratum to effectively enhance bearing capacity.
[0003] The vertical bearing capacity of the pile foundation 1s generally composed of a pile side friction resistance and a pile end resistance between a pile and the soil. The pile side friction resistance seems to be more important in clay foundations, especially in deep, thick, soft and clay soil foundations. When the load of the upper building is too large, it is often chosen to increase the pile diameter and the pile length to obtain a larger pile side friction resistance. In addition, when the groundwater level rises, in the case where the superstructure cannot balance the groundwater buoyancy, the whole or part of the structure will be affected by an upward buoyancy.
Therefore, the anti-buoyancy check should be carried out in the design of the pile foundation to ensure the safety of the building foundation, the conventional method of which is still to increase the pile diameter and the pile length to obtain a larger pile side friction resistance to resist the buoyancy, but too large pile diameter and pile length will not only bring about technical difficulties in construction, but also greatly increase the engineering cost of the construction.
[0004] Prior to the present invention, the Chinese patent "A threaded ramming pile and construction method thereof" (Application Number: 201810075911.9) has disclosed a threaded pile composed of a threaded pile body and a ramming pile head. In addition to increasing the bearing capacity of the soil layer at the end of the pile by impacting and compacting the bearing layer at the end of the pile, the invention adds the occlusal force between the thread of the pile body and the soil body in addition to the frictional resistance of the pile side and the resistance of the pile end, providing vertical bearing capacity and pull-out resistance. However, the thread
2 LU502585 width is too small to provide limited bite force, and the requirements for the pile driving machinery are too high during the pile driving process, which affects its actual use effect and has large application limitations. Therefore, it is particularly necessary to propose a prefabricated pipe pile that can not only effectively enhance the vertical bearing capacity and pull-out resistance, but also minimize the engineering cost.
[0005] For the above technical problems, the present invention provides a prefabricated pipe pile suitable for a soft soil stratum to effectively enhancing bearing capacity and a construction method thereof, which solves the construction difficulty and cost problem caused by an excessive upper load in the design of the pile foundation in the soft soil layer, which implements that the vertical bearing capacity and pull-out resistance of the prefabricated pipe piles can be increased under the premise of constant pile diameter and pile length.
[0006] In order to solve the above problems, the present invention adopts the following technical solutions.
[0007] A prefabricated pipe pile suitable for a soft soil stratum to effectively enhance bearing capacity. The prefabricated pipe pile includes a pile cap, a prefabricated pipe pile body, and a pile tip. A side surface of the prefabricated pipe pile body is provided with a plurality of rows of through grooves along an axial direction of the prefabricated pipe pile body; and the through grooves penetrate a wall of the prefabricated pipe pile body; the prefabricated pipe pile includes: soil-extruding units arranged in each of the through grooves, one ends of the soil-extruding units located inside the prefabricated pipe pile body are provided with chamfer surfaces, and a plurality of soil-extruding units in a same row are connected to each other by a connection structure that is detachable under an external force; a suspender arranged at an inner bottom end of the prefabricated pipe pile body; and a steel wire rope, one end of which is connected with the suspender, and another end of which is connected with a barb on the pile cap; and a top end of the suspender is capable of piercing the connection structure, and squeezing the soil-extruding units into soil outside the prefabricated pipe pile body, when the steel wire rope lifts the suspender to move upwards inside the prefabricated pipe pile body.
[0008] Each row of the through grooves includes a plurality of through groove units evenly
> LU502585 arranged along a circumferential direction of the prefabricated pipe pile body.
[0009] The through groove units are lateral hole units arranged on the side surface of the prefabricated pipe pile body; and the soil-extruding units are soil-extruding pipes, one ends of which are arranged in the lateral hole units, other ends of which are arranged inside the prefabricated pipe pile body, and the one ends of the soil-extruding pipes arranged in the lateral hole units are in spike shapes.
[0010] The lateral hole units on adjacent horizontal planes of the prefabricated pipe pile body are arranged at a staggered angle in a horizontal direction.
[0011] The connection structure is a tape.
[0012] A material of the soil-extruding pipes is a stainless steel.
[0013] The soil-extruding pipes are provided with lateral grooves having a length L 1 to 1.5 times a wall thickness d of the prefabricated pipe pile body.
[0014] The suspender is in a cone shape, and an angle b between a generatrix and a bottom surface of the conical suspender is equal to a chamfer angle a at a tail portion of the soil-extruding pipes.
[0015] The present invention further discloses a method for constructing prefabricated pipe piles suitable for a soft soil stratum to effectively enhance bearing capacity. The method includes the following steps:
Step 1: determining, according to site actual situations including physical and chemical parameters of site soil and a load on an upper portion of a building, pile lengths, pile diameters, a number of and the positions of the prefabricated pipe piles, levelling the site before starting construction, and arranging lines by a surveyor to determine the positions of the piles, reviewing results of arranging the lines by a supervision unit, and errors of the pile positions should meet the relevant specification requirements;
Step 2: installing a pile tip at one end of a first section of the prefabricated pipe piles, and installing a pile cap at another end of the first section of the prefabricated pipe piles, and lifting the first section of the prefabricated pipe piles to a designated pile position, ensuring, during the lifting process, that a lifting device is stable, a vertical deflection angle between a guide frame and ground is not greater than 3°, and an error between a position of the pile tip and the designed pile position is not greater than 40mm;
Step 3: pressing the piles by using a pipe-sinking machine or a static pressure until the prefabricated pipe piles reach a designed elevation;
+ LU502585
Step 4: frapping a steel wire rope to lıft a suspender to the ground, and detaching, when the suspender is lifted through each soil-extruding pipe, connection structures between a plurality of soil-extruding pipes on a same horizontal plane to push each soil-extruding pipe into the soil; and
Step 5: concreting a pile top bearing platform.
[0016] The present invention further discloses a method for constructing the prefabricated pipe piles suitable for a soft soil stratum to effectively enhance bearing capacity. The method includes the following steps:
Step 1: determining, according to site actual situations including physical and chemical parameters of site soil and a load on an upper portion of a building, pile lengths, pile diameters, a number of and positions of the prefabricated pipe piles, levelling the site before starting construction, and arranging lines by a surveyor to determine the positions of the piles, reviewing results of arranging the lines by a supervision unit, and errors of the pile positions should meet relevant specification requirements;
Step 2: installing a pile tip at one end of the first section of the prefabricated pipe piles, and installing a pile cap at another end of the first section of the prefabricated pipe piles, and lifting the first section of the prefabricated pipe piles to a designated pile position, ensuring, during the lifting process, that a lifting device is stable, a vertical deflection angle between a guide frame and ground is not greater than 3°, and an error between the position of the pile tip and the designed pile position is not greater than 40mm ;
Step 3: press the piles by using a pipe-sinking machine or a static pressure until the prefabricated pipe piles reaching a designed elevation;
Step 4: frapping a steel wire rope to lift a suspender to the ground, detaching, when the suspender is lifted through each soil-extruding pipe, connection structures between a plurality of soil-extruding pipes on a same horizontal plane to push each soil-extruding pipe into the soil, and pressing the piles again so that lateral grooves on the soil-extruding pipes are locked on the pipe walls of the prefabricated pipe piles to fix positions of the soil-extruding pipes; and
Step 5: concreting a pile top bearing platform.
[0017] Beneficial effect
Compared with the prior art, the beneficial effects of the present invention are that: the technical process of the present invention is simple and the operability is strong, and the vertical bearing capacity and the anti-pulling capacity of the single pile can be increased under the premise of the constant pile diameter and the constant pile length; and
> LU502585 according to the present invention, the occlusal force between the extruding soil pipe and the soil body is innovatively increased in addition to the pile side friction resistance and the pile end resistance to provide vertical bearing capacity and anti-pulling capacity, and the overall performance of the pile body is greatly ensured by the existence of the soil-extruding pipe on the pile side.
[0018] FIG. 1 illustrates a schematic diagram of an overall structure of the present invention.
[0019] FIG. 2 illustrates a schematic diagram of a connection structure between a pile cap and a single-section prefabricated pipe pile of the present invention.
[0020] FIG. 3 illustrates a schematic diagram of a connection structure of each two sections of prefabricated pipe piles of the present invention.
[0021] FIG. 4 illustrates a schematic diagram of a connection structure between a pile tip and a single-section prefabricated pipe pile of the present invention.
[0022] FIG. S illustrates a schematic diagram after the construction of the present invention is completed.
[0023] FIG. 6 illustrates an enlarged view of a soil-extruding pipe of the present invention;
[0024] FIG. 7 illustrates a top view of the present invention.
[0025] FIG. 8 illustrates a schematic diagram of another overall structure of the present invention.
[0026] FIG. 9 illustrates a state diagram of a soil-extruding pipe in position 1 when a suspender is just pierced into a connecting structure of the present invention.
[0027] FIG. 10 illustrates a state diagram of a soil-extruding pipe in position 2 when the suspender is pierced into a connecting structure of the present invention.
[0028] FIG. 11 illustrates a state diagram of a soil-extruding pipe in position 3 when the suspender is totally pierced into a connecting structure of the present invention. where, 1 is a pile cap; 2 is a barb; 3 is a prefabricated pipe pile body; 4 is a tape; 5 is steel wire rope; 6 1s a bolt; 7 is a flange gasket; 8 is a flange plate; 9 is a soil-extruding pipe; 10 is a spike; 11 isa lateral hole; 12 1s a lateral groove; 13 is a suspender;14 is a pile tip.
6 LU502585
[0029] In order to facilitate the understanding of the present invention, the present invention will be described in detail in connection with the related drawings.
[0030] Embodiment 1
[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from the scope of this description. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.
[0032] In order to understand the above objects, features and advantages of the present invention more clearly, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments may be combined with each other under the condition that they do not conflict with each other.
[0033] As illustrated in FIGS. 1-6, provided is a prefabricated pipe pile suitable for a soft soil stratum to effectively enhance bearing capacity. The prefabricated pipe pile includes a pile cap 1, a prefabricated pipe pile body 3, a soil-extruding pipe 9, a pile tip 14, and a steel wire rope 5.
[0034] The prefabricated pipe pile body 3 is a prefabricated concrete pipe pile body; the length of each section of pipe piles is Sm, with an inner diameter of 100cm and an outer diameter of 120cm. There are two rows of through grooves on the side surface of the pile body, and the vertical distance between the two rows of through grooves is 100cm.
[0035] The soil-extruding unit is a stainless steel component, one end of which is provided with a pointed tip and another end of which is provided with a 45° chamfer surface; the steel wire rope is Q235 unbonded steel strand 4, with the diameter of ®22, and the material of red copper wire; one end of the steel wire rope is connected to the suspender, and another end of the steel wire rope is connected to the barb. Each section of the pipe piles are connected by flanges; a plurality of soil-extruding units in a same row are connected to each other by a connection structure that is detachable under by external force,
[0036] Preferably, the through grooves are several rows of lateral holes arranged on the side surface of the prefabricated pipe pile body, so that the soil-extruding pipe can be penetrated into the soil in the subsequent construction. The lateral holes of the adjacent horizontal planes are staggered by 90° in a horizontal direction.
7 LU502585
[0037] Preferably, the connection structure is a tape.
[0038] Preferably, the suspender is conical steel component, and an included angle b between a generatrix and a bottom surface of the suspender is equal to a chamfer angle « at a tail portion of the soil-extruding pipes.
[0039] The process of inserting the soil-extruding pipe into the soil body in the present invention will be described in detail below. As illustrated in FIGS 9 to 11, when the prefabricated pipe piles are pile-sinked in place, the construction personnel move the suspender upward through the steel wire rope, and the suspender is in a shape of cone. When the suspender rises to the vicinity of the soil-extruding pipe, the side surface of the suspender is in contact with the chamfer surface at the tail portion of the soil-extruding unit. As the position of the suspender keeps rising, the tape between the soil-extruding units on the same level is detached, and the suspender exerts a horizontal force on the soil-extruding pipe through the chamfer surface at the tail portion of the soil-extruding unit, so that the soil-extruding unit gradually penetrates into the soil. When the suspender completely passes through the horizontal plane where the soil-extruding unit is located, the lateral groove of the soil-extruding unit is directly below the wall of the prefabricated pipe pile. At this time, the prefabricated pipe pile is lightly hammered again by the pile-sinking device, so that the lateral groove of the soil-extruding unit locks the pipe wall of the prefabricated pipe pile, and the resulting vertical displacement error of the pile position is within the allowable range of the specification, which may not be considered.
[0040] FIG. 5 illustrates the situation after the construction of the present invention is completed, and the soil-extruding unit has been completely penetrated into the soil at this time.
For the gap formed between the lower portion of the soil-extruding unit and the wall of the prefabricated pipe pile, the soil will automatically fill the gap under the pressure of water and soil around the pile, so as to achieve the purpose of completely fixing the position of the soil-extruding unit.
[0041] Embodiment 2
[0042] As another embodiment of the present invention, the difference between this embodiment and Embodiment 1 is that the soil-extruding unit is provided with a lateral groove with an upward opening, and the length of the lateral groove is 12 cm; The total length of the soil-extruding unit is 40cm, the length L of the lateral groove is slightly larger than the wall thickness of the prefabricated pipe pile, and the position of the soil-extruding pipe is fixed.
[0043] The top of the prefabricated pipe pile is provided with a slot matched with the pile cap.
8 LU502585
[0044] Provided is a method for constructing prefabricated pipe piles suitable for a soft soil stratum to effectively enhance bearing capacity of the present invention. The method includes the following steps.
In Step 1, according to site actual situations ( which includes physical and chemical parameters of site soil, a load on an upper portion of the building and so on), pile lengths, pile diameters, a number of and positions of the prefabricated pipe piles are determined, in this example, the required pile length is 10m, the pile diameter is 120cm, and a single pile needs two pieces of pipe piles, one set of flanges, one pile cap and one pile tip; the site is levelled before starting construction, and a surveyor arranges lines to determine the positions of the piles, the supervision unit reviews results of arranging the lines, and errors of the pile positions should meet the relevant specification requirements.
In Step 2, a pile tip is installed at one end of a first section of the prefabricated pipe piles, and a pile cap is installed at another end of the first section of the prefabricated pipe piles, and the first section of the prefabricated pipe piles is lifted to a designated pile position, it is ensured during the lifting process that a lifting device is stable, a vertical deflection angle between a guide frame and ground is not greater than 3°, and an error between the position of the pile tip and the designed pile position is not greater 40mm.
In Step 3, a static pile pressing machine is started, the maximum pile pressing force is 860tf. when the top of the first-section of the prefabricated pipe pile is 500mm away from the ground, the pile cap is removed, the flange is installed, and the prefabricated pipe pile is connected to another prefabricated pipe pile installed with flanges through bolts, and flange pads are arranged between the flanges; the pile cap is installed at another end of the second section of pipe piles, and the hydraulic static pile pressing machine is continued to to be use to press the pile.
In Step 4, Step 3 is repeated until the prefabricated pipe pile reaches the design elevation.
In Step 5, the steel wire rope is frapped to lift the suspender to the ground, when the suspender is lifted through each soil-extruding pipe, the tape is detached, and each soil-extruding pipe is pushed into the soil, and at the same time, the hydraulic static pile pressing machine is used again, so that the lateral groove is locked to the pipe, and the position of the soil-extruding pipe is fixed by the pile.
? LU502585
In Step 6, a pile top bearing platform is concreted.
[0045] The examples described in the present invention are only to describe the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design idea of the present invention, various modifications and improvements made by those skilled in the art to the technical solutions of the present invention shall fall into the protection scope of the present invention.
Claims (10)
1. A prefabricated pipe pile suitable for a soft soil stratum to effectively enhance bearing capacity, comprising: a pile cap, a prefabricated pipe pile body, and a pile tip; wherein a side surface of the prefabricated pipe pile body is provided with a plurality of rows of through grooves along an axial direction of the prefabricated pipe pile body, and the through grooves penetrate a wall of the prefabricated pipe pile body; wherein the prefabricated pipe pile comprises: soil-extruding units arranged in each of the through grooves, wherein one ends of the soil-extruding units located inside the prefabricated pipe pile body are provided with chamfer surfaces, and a plurality of soil-extruding units in a same row are connected to each other by a connection structure that is detachable under an external force; a suspender arranged at an inner bottom end of the prefabricated pipe pile body; and a steel wire rope, one end of which is connected with the suspender, and another end of which is connected with a barb on the pile cap; wherein a top end of the suspender is capable of piercing the connection structure, and squeezing the soil-extruding units into soil outside the prefabricated pipe pile body, when the steel wire rope lifts the suspender to move upwards inside the prefabricated pipe pile body.
2. The prefabricated pipe pile suitable for the soft soil stratum to effectively enhance the bearing capacity according to claim 1, wherein each row of the through grooves comprises a plurality of through groove units evenly arranged along a circumferential direction of the prefabricated pipe pile body.
3. The prefabricated pipe pile suitable for the soft soil stratum to effectively enhance the bearing capacity according to claim 2, wherein the through groove units are lateral hole units arranged on the side surface of the prefabricated pipe pile body; and the soil-extruding units are soil-extruding pipes, one ends of which are arranged in the lateral hole units, other ends of which are arranged inside the prefabricated pipe pile body, and the one ends of the soil-extruding pipes arranged in the lateral hole units are in spike shapes.
4. The prefabricated pipe pile suitable for the soft soil stratum to effectively enhance the bearing capacity according to claim 2, wherein the lateral hole units on adjacent horizontal planes of the prefabricated pipe pile body are arranged at a staggered angle in a horizontal direction.
5. The prefabricated pipe pile suitable for the soft soil stratum to effectively enhance the bearing capacity according to claim 1, wherein the connection structure is a tape.
6. The prefabricated pipe pile suitable for the soft soil stratum to effectively enhance the bearing capacity according to claim 3, wherein, a material of the soil-extruding pipes is a stainless steel.
7. The prefabricated pipe pile suitable for the soft soil stratum to effectively enhance the bearing capacity according to claim 6, wherein the soil-extruding pipes are provided with lateral grooves having a length L 1 to 1.5 times a wall thickness d of the prefabricated pipe pile body.
8. The prefabricated pipe pile suitable for the soft soil stratum to effectively enhance the bearing capacity according to claim 1, wherein the suspender is in a cone shape, and an angle b between a generatrix and a bottom surface of the conical suspender is equal to a chamfer angle a at a tail portion of the soil-extruding pipes.
9. A method for constructing prefabricated pipe piles suitable for a soft soil stratum to effectively enhance bearing capacity according to any one of claims 1 to 8, wherein the method comprises following steps: Step 1: determining, according to site actual situations comprising physical and chemical parameters of site soil and a load on an upper portion of a building, pile lengths, pile diameters, a number of and positions of the prefabricated pipe piles, levelling the site before starting
12 LU502585 construction, and arranging lines by a surveyor to determine the positions of the piles, reviewing results of arranging the lines by a supervision unit, wherein errors of the pile positions should meet relevant specification requirements; Step 2: installing a pile tip at one end of a first section of the prefabricated pipe piles, and installing a pile cap at another end of the first section of the prefabricated pipe piles, and lifting the first section of the prefabricated pipe piles to a designated pile position, ensuring, during the lifting process, that a lifting device is stable, a vertical deflection angle between a guide frame and ground is not greater than 3°, and an error between a position of the pile tip and the designed pile position is not greater than 40mm; Step 3: pressing the piles by using a pipe-sinking machine or a static pressure until the prefabricated pipe piles reach a designed elevation; Step 4: frapping a steel wire rope to lift a suspender to the ground, and detaching, when the suspender is lifted through each soil-extruding pipe, connection structures between a plurality of soil-extruding pipes on a same horizontal plane to push each soil-extruding pipe into the soil; and Step 5: concreting a pile top bearing platform.
10. A method for constructing prefabricated pipe piles suitable for soft soil stratum to effectively enhance bearing capacity according to claim 7, wherein the method comprises following steps: Step 1: determining, according to site actual situations comprising physical and chemical parameters of site soil and a load on an upper portion of a building, pile lengths, pile diameters, a number of and positions of the prefabricated pipe piles, levelling the site before starting construction, and arranging lines by a surveyor to determine the positions of the piles, reviewing results of arranging the lines by a supervision unit, wherein errors of the pile positions should meet relevant specification requirements; Step 2: installing a pile tip at one end of a first section of the prefabricated pipe piles, and installing a pile cap at another end of the first section of the prefabricated pipe piles, and lifting the first section of the prefabricated pipe piles to a designated pile position, ensuring, during the lifting process, that a lifting device is stable, a vertical deflection angle between a guide frame
B LU502585 and ground is not greater than 3° , and an error between the position of the pile tip and the designed pile position is not greater than 40mm;
Step 3: pressing the piles by using a pipe-sinking machine or a static pressure until the prefabricated pipe piles reach a designed elevation;
Step 4: frapping a steel wire rope to lift a suspender to the ground, detaching, when the suspender is lifted through each soil-extruding pipe, connection structures between a plurality of soil-extruding pipes on a same horizontal plane to push each soil-extruding pipe into the soil, and pressing the piles again so that lateral grooves on the soil-extruding pipes are locked on pipe walls of the prefabricated pipe piles to fix positions of the soil-extruding pipes; and
Step 5: concreting a pile top bearing platforms.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210124643.1A CN114517473B (en) | 2022-02-10 | 2022-02-10 | Prefabricated pipe pile capable of effectively enhancing bearing capacity in soft soil stratum and construction method thereof |
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| Publication Number | Publication Date |
|---|---|
| LU502585B1 true LU502585B1 (en) | 2023-08-10 |
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| LU502585A LU502585B1 (en) | 2022-02-10 | 2022-07-28 | Prefabricated pipe pile suitable for soft soil stratum to effectively enhance bearing capacity and construction method thereof |
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| CN (1) | CN114517473B (en) |
| LU (1) | LU502585B1 (en) |
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| CN116163293B (en) * | 2023-04-25 | 2023-07-14 | 四川蜀道建筑科技有限公司 | Precast pile, precast pile connecting device and precast pile system |
| CN116971411B (en) * | 2023-09-22 | 2023-12-01 | 上海勘测设计研究院有限公司 | Wind power single pile and pile sinking construction device |
Citations (6)
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| EP0097525A2 (en) * | 1982-06-21 | 1984-01-04 | Chi-Lung Hsiao | Piles |
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| KR20120123952A (en) * | 2011-05-02 | 2012-11-12 | 김일 | Expansion device for end of file |
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| CN102505691B (en) * | 2011-10-28 | 2015-04-15 | 中冶交通工程技术有限公司 | Prefabricating pipe pile construction method |
| CN203639903U (en) * | 2013-12-12 | 2014-06-11 | 江苏中瑞路桥建设有限公司 | Side friction enhancement type precast tube pile structure |
| CN104294822B (en) * | 2014-10-13 | 2016-01-06 | 安徽天筑建设（集团）有限公司 | Reinforcing thick-covering and deep-burying soft soil rigid-flexible mechanical arm construction method |
| CN104846809B (en) * | 2015-03-31 | 2017-06-16 | 浙江大学 | It is a kind of draining and the prefabricated tubular pile and its construction method of frictional resistance to be increased |
| CN107059854A (en) * | 2017-04-24 | 2017-08-18 | 南京工业大学 | It is a kind of new prefabricated drainage tubular pile and its construction method to be prepared |
| CN111350181B (en) * | 2020-03-26 | 2021-06-22 | 上海杰地建筑设计有限公司 | Precast concrete tubular pile only bearing anti-pulling effect |
| CN112281829A (en) * | 2020-11-09 | 2021-01-29 | 中国瑞林工程技术股份有限公司 | Composite pile foundation structure and construction method thereof |
| CN112761137A (en) * | 2021-01-21 | 2021-05-07 | 上海市城市建设设计研究总院（集团）有限公司 | Precast pile for enhancing side friction resistance and construction method thereof |
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- 2022-07-28 LU LU502585A patent/LU502585B1/en active IP Right Grant
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| EP0097525A2 (en) * | 1982-06-21 | 1984-01-04 | Chi-Lung Hsiao | Piles |
| EP0157033A1 (en) * | 1984-04-06 | 1985-10-09 | Johan Hasiholan Simanjuntak | Driven pile with transverse broadening in situ |
| KR20120123952A (en) * | 2011-05-02 | 2012-11-12 | 김일 | Expansion device for end of file |
| WO2015174737A1 (en) * | 2014-05-14 | 2015-11-19 | (주)삼일이엔씨 | Self-diameter-enlarging pile, and method for constructing same |
| CN105256790A (en) * | 2015-11-10 | 2016-01-20 | 浙江大学 | Prefabricated skirt type pipe pile used for drainage and added with pile body inclined support and construction method thereof |
| CN112726586A (en) * | 2020-12-18 | 2021-04-30 | 河海大学 | Reinforcing sheet outward-rotating type nailing anchoring pile and construction method |
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| CN114517473B (en) | 2023-03-28 |
| CN114517473A (en) | 2022-05-20 |
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