LU505665A1 - Composite pile foundation structure of steel pipe-concrete branch piles and construction method thereof - Google Patents
Composite pile foundation structure of steel pipe-concrete branch piles and construction method thereof Download PDFInfo
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- LU505665A1 LU505665A1 LU505665A LU505665A LU505665A1 LU 505665 A1 LU505665 A1 LU 505665A1 LU 505665 A LU505665 A LU 505665A LU 505665 A LU505665 A LU 505665A LU 505665 A1 LU505665 A1 LU 505665A1
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- squeeze
- branch
- expansion
- steel pipe
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 89
- 239000010959 steel Substances 0.000 title claims abstract description 89
- 239000002131 composite material Substances 0.000 title claims abstract description 25
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 239000002689 soil Substances 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
-
- 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
- E02D5/48—Piles varying in construction along their length, i.e. along the body between head and shoe, e.g. made of different materials along their length
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/728—Onshore wind turbines
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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 composite pile foundation structure of steel pipe-concrete branch piles according to the present invention comprises a multi-branch concrete branch pile and an open steel pipe fixed inside the multi-branch concrete branch pile. The open steel pipe can reduce the impact of the soil squeezing effect on the hole wall and adjacent pile foundations caused by adjacent pile foundations during construction, reduce the collapse of hole walls that lack support, and improve the applicability of pile foundations on weak foundations. The composite pile foundation structure of steel pipe-concrete branch piles according to the present invention can not only greatly improve the joint bearing performance of the composite pile foundation and the pile quality of the internal rigid piles, but also better exert the effect of branch piles, and can significantly improve the supporting performance of the composite pile foundation, and significantly increase the scope of application of branch piles. This provides new technical methods for the treatment of weak foundations.
Description
BL-5795
COMPOSITE PILE FOUNDATION STRUCTURE OF STEEL PIPE-CONCRETE “*°°665
BRANCH PILES AND CONSTRUCTION METHOD THEREOF
The present invention relates to the field of geotechnical engineering, in particular to a composite pile foundation structure of steel pipe-concrete branch piles and a construction method thereof.
Our country has a vast territory, the geological conditions are very complex, and weak foundations such as silt and loess are distributed over a wide range. With the rapid development of our country's economy, underground space has been greatly developed. In areas with developed economies and dense transportation networks, the bearing capacity of weak foundations has seriously affected the development of building structures and infrastructure. Weak foundations generally have high moisture content, high compressibility, low strength, and complex soil layer distribution. When building dense railways, highways, municipal and water conservancy projects on such foundations, necessary reinforcement must be carried out, to increase the stability of the foundation and reduce post-construction settlement. For example, the pile foundations of high-speed railway bridges are subject to loads from superstructures such as bridges, and the resulting settlement directly affects the stability and safe operation of high-speed railway lines.
At present, the main methods to improve the bearing capacity of weak foundations include cement cast-in-place piles, immersed tube cast-in-place piles, drilled cast-in-place piles, concrete prefabricated piles and squeezed branch piles.
However, these methods currently have the following shortcomings: The single pile bearing capacity of cement cast-in-place piles is low and the construction quality is difficult to control. Due to the influence of grouting pressure, uneven grouting and 1
BL-5795 hole walls, immersed tube cast-in-place piles and bored cast-in-place piles are prone-U505665 to pile necking, and mud treatment is also inconvenient. The requirements for hole cleaning and concrete pouring are high, the original soil cannot be fully utilized, and the environment is polluted. Concrete prefabricated piles are noisy during construction, and there is an obvious soil squeezing effect, which can easily cause the pile foundation to float or affect the safety of surrounding buildings. As a new type of pile foundation technology, squeezed branch piles mainly uses a branch plate drilling rig to perform squeeze and expansion in a suitable soil layer after rotary drilling to form a branch plate cavity. Finally, concrete is poured to form a cast-in- place pile with branch plates, which can significantly improve the bearing capacity of a single pile and reduce the pile diameter and length. It has been widely used in many cities. However, due to the complex squeeze and expansion process and difficult construction technology, the construction efficiency is low and the construction cost is high. However, due to the complex squeeze and expansion process and difficult construction technology, the construction efficiency is low and the construction cost is high. Secondly, since secondary squeeze and expansion is required after the hole is formed, it will have a greater impact on the hole wall, and since the secondary squeeze and expansion will inevitably have an impact on adjacent pile holes, hole walls that lack support are prone to collapse. Moreover, the soil squeezing effect causes the hole diameter to change, resulting in unsatisfactory pile quality. This phenomenon is more obvious in weak foundations. Therefore, currently due to technical limitations, squeezed branch piles are not suitable for most weak foundations.
In view of this, there is an urgent need for a composite pile foundation with reliable construction quality, high bearing capacity and excellent economic benefits.
In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a composite pile foundation structure of steel pipe-concrete branch piles and a construction method thereof. 2
BL-5795
To achieve the above objects, the present invention provides the following-U505665 technical solutions.
A composite pile foundation structure of steel pipe-concrete branch piles comprises a multi-branch concrete branch pile and an open steel pipe fixed inside the multi-branch concrete branch pile, wherein the open steel pipe comprises a steel pipe body, wherein a plurality of squeeze and expansion openings are provided in a circumferential side wall of the steel pipe body, wherein the multi-branch concrete branch pile comprises a pile body and a plurality of multi-branch plates distributed on the circumferential side of the pile body, which extend outward from the squeeze and expansion openings of the open steel pipe.
Preferably, the plurality of squeeze and expansion openings are symmetrically distributed along the cross section of the steel pipe body, and the plurality of multi- branch plates are evenly spaced along the circumference of the pile body.
As a preferred technical solution, the plurality of multi-branch concrete branch pile are constructed through a continuous multi-branch squeeze and expansion device, wherein the continuous multi-branch squeeze and expansion device comprises a chassis, and a connecting plate is symmetrically provided above the chassis, and a telescopic rod is vertically fixed between the chassis and the connecting plate, wherein a plurality of multi-branch squeeze and expansion arms are installed between the connecting plate and the chassis, and the multi-branch squeeze and expansion arms comprise at least two sets of mutually hinged squeeze and expansion units, wherein the top ends of the squeeze and expansion units close to the connecting plate are hinged to the connecting plate, and the bottom ends of the squeeze and expansion units close to the chassis are hinged to the chassis, wherein the squeeze and expansion units comprise a first squeeze and expansion arm and a second squeeze and expansion arm that are hinged to each other, and wherein the telescopic rod is slidably connected to a limiting support steel ring, which is hingedly connected to the squeeze and expansion units.
Further preferably, the limiting support steel ring comprises an inner ring for slidingly fitting with the telescopic rod and an outer ring for hinged connection with 3
BL-5795 the squeeze and expansion units, wherein the inner ring and the outer ring are fixedlyLU505665 connected through limiting rods, wherein connecting lugs are fixed on the outside of the outer ring, and a connecting hole is formed in the connecting lugs in the horizontal direction through the connecting lugs, respectively, wherein the squeeze and expansion units are hingedly connected to the outer ring through shaft pins passing through the connecting holes, respectively.
More preferably, the first squeeze and expansion arm and the second squeeze and expansion arm are hinged through a rotation limiting device, wherein the rotation limiting device comprises a rotating shaft and a first connecting block and a second connecting block that are rotationally connected to the rotating shaft, wherein the first connecting block and the second connecting block are used to connect with the first squeeze and expansion arm and the second squeeze and expansion arm, respectively, wherein the first connecting block has a U-shaped latching opening in the middle of one side, wherein the first connecting block has a pair of sleeves symmetrically fixed on both sides of the U-shaped latching opening, wherein the first connecting block is rotationally connected to the rotating shaft through the sleeves, wherein a limiting block is fixed on one side of the second connecting block, wherein the limiting block and the second connecting block are not in the same plane, and the obtuse angle formed by the limiting block and the second connecting block faces the first connecting block, wherein a sleeve for rotational connection with the rotating shaft is fixed on one side of the limiting block, wherein the length of the limiting block is greater than the depth of the U-shaped latching opening. When the first connecting block and the second connecting block rotate relative to each other, it can be ensured that the angle between the first connecting block and the second connecting block is always less than 180°, thereby limiting the relative angle between the first squeeze and expansion arm and the second squeeze and expansion arm, so that the squeeze and expansion units always tend to expand outward.
The present invention also provides a construction method of the composite pile foundation structure of steel pipe-concrete branch piles, comprising the following steps: 4
BL-5795
(1) hoisting the open steel pipe to the target depth in a hole to support the hole-U505665 wall after the hole is drilled to the specified depth, and then marking the positions of each squeeze and expansion opening to facilitate the subsequent work of a continuous multi-branch squeeze and expansion device.
Compared with conventional full-section sealed steel pipes, discrete openings can greatly save steel, reduce project costs, and have good hole wall support functions.
(2) connecting the continuous multi-branch squeeze and expansion device to an external hydraulic device through the connecting plate, hoisting the continuous multi- branch squeeze and expansion device into the open steel pipe and aligning multi-
branch squeeze and expansion arms thereof with the squeeze and expansion openings of the open steel pipe; compressing the continuous multi-branch squeeze and expansion device, extending the multi-branch squeeze and expansion arms outward, squeezing the foundation soil near the pile hole and expanding the hole diameter, when the hydraulic device is started to exert downward force on the continuous multi-branch squeeze and expansion device; stretching the continuous multi-branch squeeze and expansion device by the hydraulic device to reset the continuous multi-branch squeeze and expansion device and thus completing the squeeze and expansion at this position, when the squeeze and expansion reaches the target hole diameter; changing the position of the continuous multi-branch squeeze and expansion device to align them with the corresponding squeeze and expansion openings when the open steel pipe has multi-layer squeeze and expansion openings; repeating step (2) to complete the squeeze and expansion at the corresponding position; lifting out the continuous multi-branch squeeze and expansion device until all squeeze and expansion are completed.
By using a continuous multi-branch squeeze and expansion device, a plurality of branch openings can be squeezed and expanded at the same time within the longitudinal length range of the pile foundation axis and the cross section during the squeeze and expansion process, which can reduce the number of squeeze and expansion of conventional construction methods and avoid the problem of requiring multiple squeezes and expansions to form a multi-branch pile foundation structure with high
5
BL-5795 bearing capacity due to the complexity of the squeeze and expansion process of the U505665 branch piles. This significantly improves construction efficiency and reduces project costs. (3) cleaning the slag accumulated in the hole due to squeeze and expansion, then hoisting a steel cage into the hole and performing grouting; finally forming branch plates by the cement slurry flowing along the squeeze and expansion openings in the open steel pipe to the space created by the squeeze and expansion during grouting; obtaining a composite pile foundation of steel pipe multi-branch concrete branch piles after forming.
Compared with the prior art, the advantageous technical effects brought by the present invention are as follows.
The composite pile foundation structure of steel pipe-concrete branch piles according to the present invention comprises a multi-branch concrete branch pile and an open steel pipe fixed inside the multi-branch concrete branch pile. The open steel pipe can reduce the impact of the soil squeezing effect on the hole wall and adjacent pile foundations caused by adjacent pile foundations during construction, reduce the collapse of hole walls that lack support, and improve the applicability of pile foundations on weak foundations. Secondly, it can reduce the damage caused by the soil squeezing effect to the newly formed cement pile body and avoid hidden defects of the pile foundation. It also avoids a series of problems such as hole wall collapse caused by secondary squeeze and expansion after conventional squeeze and expansion, and hole diameter changes due to soil squeezing effect, which affects pile quality. It also significantly improves the pile foundation bearing capacity and construction efficiency. In addition, compared with conventional full-section sealed steel pipe piles, discrete openings can greatly save steel and reduce project costs.
The composite pile foundation structure of steel pipe-concrete branch piles according to the present invention can not only greatly improve the joint bearing performance of the composite pile foundation and the pile quality of the internal rigid piles, but also better exert the effect of branch piles, and can significantly 6
BL-5795 improve the scope of application of branch piles. This provides new technical LU505665 methods for the treatment of weak foundations and has certain economic, technical and engineering benefits.
Fig. 1 is a schematic diagram of a composite pile foundation structure of steel pipe-concrete branch piles;
Fig. 2 is a schematic structural diagram of an open steel pipe;
Fig. 3 is a schematic diagram of coordinated construction of an open steel pipe and a continuous multi-branch squeeze and expansion device;
Fig. 4 is a schematic structural diagram of the continuous multi-branch squeeze and expansion device when it is not squeezing and expanding;
Fig. 5 is a schematic structural diagram of the continuous multi-branch squeeze and expansion device in the squeeze and expansion state;
Fig. 6 is a schematic structural diagram of the limiting support steel ring;
Fig. 7 is a schematic structural diagram of the outer ring;
Fig. 8 is a schematic structural diagram of the rotary limiting device; and
Fig. 9 is an exploded view of the rotary limiting device.
List of reference signs 1 multi-branch concrete branch pile 11 pile body 12 multi-branch plate 2 open steel pipe 21 steel pipe body 7
BL-5795 22 squeeze and expansion opening LU505665 3 continuous multi-branch squeeze and expansion device 31 chassis 32 connecting plate 33 telescopic rod 34 squeeze and expansion units 341 first squeeze and expansion arm 342 second squeeze and expansion arm 35 limiting support steel ring 351 inner ring 352 outer ring 353 limiting rod 354 connecting lug 355 connecting hole 356 shaft pin 361 rotating shaft 362 first connecting block 363 second connecting block 364 U-shaped latching opening 365 sleeve 366 limiting block
The present invention will be further described below with reference to the examples and drawings, so that those skilled in the art can better understand and implement the present invention, but the examples are not intended to limit the present invention.
It should be noted that in the present invention, "fixed", "connected", "installed", "fixed connection", etc. all mean that two components connected to each other are fixed together, usually by welding, screws, etc. "Sliding connection" and "hinged" etc. 8
BL-5795 mean that two parts are connected together and can move relative to each other. FotU505665 those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, which are only intended to facilitate the description of the present invention and simplify the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. The "first" and "second" mentioned in the present invention do not represent the specific number or order, but are only used for the distinction of names.
Referring to Fig. 1, a composite pile foundation structure of steel pipe-concrete branch piles comprises a multi-branch concrete branch pile 1 and an open steel pipe 2 fixed inside the multi-branch concrete branch pile. The open steel pipe 2 comprises a steel pipe body 21, and a plurality of squeeze and expansion openings 22 are provided in a circumferential side wall of the steel pipe body. Referring to Fig. 2, the open steel pipe has two layers of squeeze and expansion openings, and the squeeze and expansion openings in each layer are distributed symmetrically along the cross- section of the steel pipe body. The multi-branch concrete branch pile 1 comprises a pile body 11 and a number of multi-branch plates 12 distributed on the circumferential side of the pile body. The multi-branch plates 12 extend outward from the squeeze and expansion openings 22 of the open steel pipe. In the specific application, according to the design requirements of the multi-branch concrete branch pile 1, the positions that need to be squeezed and expanded are determined in advance, and the positioning and opening are performed in the side wall of the steel pipe body. The squeeze and expansion openings are symmetrically distributed along the cross- section of the steel pipe, and the number, length and width can be factory- prefabricated according to the design requirements of the pile foundation.
The multi-branch concrete branch pile 1 is constructed through a continuous 9
BL-5795 multi-branch squeeze and expansion device 3. Referring to Figs. 3 to 5, the-U505665 continuous multi-branch squeeze and expansion device 3 comprises a chassis 31, a connecting plate 32 is symmetrically provided above the chassis 31, and a telescopic rod 33 is vertically fixed between the chassis 31 and the connecting plate 32. A plurality of multi-branch squeeze and expansion arms are installed between the connecting plate 32 and the chassis 31, and the multi-branch squeeze and expansion arms are evenly spaced along the periphery of the chassis 31 and the connecting plate 32, so that the branch openings obtained by squeeze and expansion are evenly distributed on the circumferential side of the pile foundation.
During construction, the positions of the multi-branch squeeze and expansion arms correspond to the opening directions of the squeeze and expansion openings 22 in the open steel pipe. During the squeeze and expansion process, squeeze and expansion units in the multi-branch squeeze and expansion arms can extend from the squeeze and expansion openings 22 and squeeze the soil around the hole wall.
The multi-branch squeeze and expansion arms comprises at least two sets of squeeze and expansion units 34 that are hinged to each other. The top ends of the squeeze and expansion units close to the connecting plate are hinged to the connecting plate, and the bottom ends of the squeeze and expansion units close to the chassis are hinged to the chassis. The squeeze and expansion units 34 comprises a first squeeze and expansion arm 341 and a second squeeze and expansion arm 342 that are hinged to each other, respectively. The telescopic rod 33 is slidably connected to a limiting support steel ring 35, and the limiting support steel ring 35 is hingedly connected to the squeeze and expansion units 34. In Fig. 4, there are two sets of multi-branch squeeze and expansion arms, and each multi-branch squeeze and expansion arm has three sets of squeeze and expansion units. It should be noted that the number of multi-branch squeeze and expansion arms and the number of squeeze and expansion units can be adjusted accordingly according to the number and size of the squeeze and expansion openings in the open steel pipe 2 so that they match each other. During the squeeze and expansion process, it is only necessary to adjust the positions of the continuous multi-branch squeeze and expansion device at one time to correspond to the squeeze and expansion openings 10
BL-5795 in the open steel pipe 2, so that a certain area can be squeezed and expanded U505665 thereby improving construction efficiency. Referring to Figs. 6 and 7, the limiting support steel ring 35 comprises an inner ring 351 for slidingly fitting with the telescopic rod 33 and an outer ring 352 for hinged connection with the squeeze and expansion units 34. The inner ring 351 and the outer ring 352 are fixedly connected through limiting rods 353. Connecting lugs 354 are fixed on the outside of the outer ring 352, and a connecting hole 355 is respectively formed in the connecting lugs 354 in the horizontal direction through the connecting lugs. The squeeze and expansion units 34 are hingedly connected to the outer ring 352 through shaft pins 356 that pass through the connecting holes, respectively. Further preferably, the number of limiting rods 353 is four, and the four limiting rods are evenly distributed at 90° to each other between the inner ring 351 and the outer ring 352. The limiting rod 353 serves as a connecting structure between the inner ring 351 and the outer ring 352, which can significantly improve the structural stability of the limiting support steel ring.
As a preferred embodiment, referring to Figs. 8 and 9, the first squeeze and expansion arm 341 and the second squeeze and expansion arm 342 are hinged through a rotation limiting device. The rotation limiting device comprises a rotating shaft 361 and a first connecting block 362 and a second connecting block 363 that are rotationally connected to the rotating shaft. The first connecting block 362 and the second connecting block 363 are used to connect with the first squeeze and expansion arm 341 and the second squeeze and expansion arm 342, respectively.
The first connecting block 362 has a U-shaped latching opening 364 in the middle of one side. The first connecting block 362 has a pair of sleeves 365 symmetrically fixed on both sides of the U-shaped latching opening. The first connecting block 362 is rotationally connected to the rotating shaft 361 through the sleeves. A limiting block 366 is fixed on one side of the second connecting block 363. The limiting block 366 and the second connecting block 363 are not in the same plane, and the obtuse angle formed by the limiting block 366 and the second connecting block 363 faces the first connecting block 362. A sleeve 365 for rotational connection with the rotating 11
BL-5795 shaft is fixed on one side of the limiting block 366. The length of the limiting block-U505665 366 is greater than the depth of the U-shaped latching opening 64.
The present invention also provides a construction method of the composite pile foundation structure of steel pipe-concrete branch piles, comprising the following steps: (1) hoisting the open steel pipe to the target depth in a hole to support the hole wall after the hole is drilled to the specified depth, and then marking the positions of each squeeze and expansion opening to facilitate the subsequent work of a continuous multi-branch squeeze and expansion device. The diameter of the open steel pipe is slightly smaller than the hole diameter, making it easier to hoist.
Compared with conventional full-section sealed steel pipes, discrete openings can greatly save steel, reduce project costs, and have good hole wall support functions.
In specific applications, the location that needs to be squeezed and expanded can be determined in advance according to the design requirements of the branch pile foundation. Positioning and forming openings are carried out on a circumferential side wall of the steel pipe, and the squeeze and expansion openings are distributed symmetrically along the cross-section of the steel pipe, and the quantity, length and width can be factory-prefabricated according to the design requirements of the pile foundation. (2) connecting the continuous multi-branch squeeze and expansion device to an external hydraulic device through the connecting plate, hoisting the continuous multi- branch squeeze and expansion device into the open steel pipe and aligning multi- branch squeeze and expansion arms thereof with the squeeze and expansion openings of the open steel pipe; compressing the continuous multi-branch squeeze and expansion device, extending the multi-branch squeeze and expansion arms outward, squeezing the foundation soil near the pile hole and expanding the hole diameter, when the hydraulic device is started to exert downward force on the continuous multi-branch squeeze and expansion device; stretching the continuous multi-branch squeeze and expansion device by the hydraulic device to reset the continuous multi-branch squeeze and expansion device and thus completing the 12
BL-5795 squeeze and expansion at this position, when the squeeze and expansion reaches-U505665 the target hole diameter; changing the position of the continuous multi-branch squeeze and expansion device to align them with the corresponding squeeze and expansion openings when the open steel pipe has multi-layer squeeze and expansion openings; repeating step (2) to complete the squeeze and expansion at the corresponding position; lifting out the continuous multi-branch squeeze and expansion device until all squeeze and expansion are completed; (3) cleaning the slag accumulated in the hole due to squeeze and expansion, then hoisting a steel cage into the hole and performing grouting; finally forming branch plates by the cement slurry flowing along the squeeze and expansion openings in the open steel pipe to the space created by the squeeze and expansion during grouting to improve the bearing capacity of the weak foundation.
Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention. 13
Claims (6)
1. A composite pile foundation structure of steel pipe-concrete branch piles, characterized in that it comprises a multi-branch concrete branch pile and an open steel pipe fixed inside the multi-branch concrete branch pile, wherein the open steel pipe comprises a steel pipe body, wherein a plurality of squeeze and expansion openings are provided in a circumferential side wall of the steel pipe body, wherein the multi-branch concrete branch pile comprises a pile body and a plurality of multi- branch plates distributed on the circumferential side of the pile body, which extend outward from the squeeze and expansion openings of the open steel pipe.
2. The composite pile foundation structure of steel pipe-concrete branch piles according to claim 1, characterized in that the plurality of squeeze and expansion openings are symmetrically distributed along the cross section of the steel pipe body, and the plurality of multi-branch plates are evenly spaced along the circumference of the pile body.
3. The composite pile foundation structure of steel pipe-concrete branch piles according to claim 1, characterized in that the plurality of multi-branch concrete branch pile are constructed through a continuous multi-branch squeeze and expansion device, wherein the continuous multi-branch squeeze and expansion device comprises a chassis, and a connecting plate is symmetrically provided above the chassis, and a telescopic rod is vertically fixed between the chassis and the connecting plate, wherein a plurality of multi-branch squeeze and expansion arms are installed between the connecting plate and the chassis, and the multi-branch squeeze and expansion arms comprise at least two sets of mutually hinged squeeze and expansion units, wherein the top ends of the squeeze and expansion units close to the connecting plate are hinged to the connecting plate, and the bottom ends of the squeeze and expansion units close to the chassis are hinged to the chassis, wherein the squeeze and expansion units comprise a first squeeze and expansion arm and a second squeeze and expansion arm that are hinged to each other, and wherein the telescopic rod is slidably connected to a limiting support steel ring, which is hingedly connected to the squeeze and expansion units. 14
BL-5795
4. The composite pile foundation structure of steel pipe-concrete branch piled-U505665 according to claim 3, characterized in that the limiting support steel ring comprises an inner ring for slidingly fitting with the telescopic rod and an outer ring for hinged connection with the squeeze and expansion units, wherein the inner ring and the outer ring are fixedly connected through limiting rods, wherein connecting lugs are fixed on the outside of the outer ring, and a connecting hole is formed in the connecting lugs in the horizontal direction through the connecting lugs, respectively, wherein the squeeze and expansion units are hingedly connected to the outer ring through shaft pins passing through the connecting holes, respectively.
5. The composite pile foundation structure of steel pipe-concrete branch piles according to claim 3, characterized in that the first squeeze and expansion arm and the second squeeze and expansion arm are hinged through a rotation limiting device, wherein the rotation limiting device comprises a rotating shaft and a first connecting block and a second connecting block that are rotationally connected to the rotating shaft, wherein the first connecting block and the second connecting block are used to connect with the first squeeze and expansion arm and the second squeeze and expansion arm, respectively, wherein the first connecting block has a U-shaped latching opening in the middle of one side, wherein the first connecting block has a pair of sleeves symmetrically fixed on both sides of the U-shaped latching opening, wherein the first connecting block is rotationally connected to the rotating shaft through the sleeves, wherein a limiting block is fixed on one side of the second connecting block, wherein the limiting block and the second connecting block are not in the same plane, and the obtuse angle formed by the limiting block and the second connecting block faces the first connecting block, wherein a sleeve for rotational connection with the rotating shaft is fixed on one side of the limiting block, wherein the length of the limiting block is greater than the depth of the U-shaped latching opening.
6. A construction method of the composite pile foundation structure of steel pipe- concrete branch piles according to any one of claims 1 to 5, characterized in that it comprises the following steps: 15
BL-5795
(1) hoisting the open steel pipe to the target depth in a hole to support the hole-U505665 wall after the hole is drilled to the specified depth, and then marking the positions of each squeeze and expansion opening to facilitate the subsequent work of a continuous multi-branch squeeze and expansion device;
(2) connecting the continuous multi-branch squeeze and expansion device to an external hydraulic device through the connecting plate, hoisting the continuous multi- branch squeeze and expansion device into the open steel pipe and aligning multi- branch squeeze and expansion arms thereof with the squeeze and expansion openings of the open steel pipe; compressing the continuous multi-branch squeeze and expansion device, extending the multi-branch squeeze and expansion arms outward, squeezing the foundation soil near the pile hole and expanding the hole diameter, when the hydraulic device is started to exert downward force on the continuous multi-branch squeeze and expansion device; stretching the continuous multi-branch squeeze and expansion device by the hydraulic device to reset the continuous multi-branch squeeze and expansion device and thus completing the squeeze and expansion at this position, when the squeeze and expansion reaches the target hole diameter; changing the position of the continuous multi-branch squeeze and expansion device to align them with the corresponding squeeze and expansion openings when the open steel pipe has multi-layer squeeze and expansion openings; repeating step (2) to complete the squeeze and expansion at the corresponding position; lifting out the continuous multi-branch squeeze and expansion device until all squeeze and expansion are completed;
(3) cleaning the slag accumulated in the hole due to squeeze and expansion, then hoisting a steel cage into the hole and performing grouting; finally forming branch plates by the cement slurry flowing along the squeeze and expansion openings in the open steel pipe to the space created by the squeeze and expansion during grouting; obtaining a composite pile foundation of steel pipe multi-branch concrete branch piles after forming.
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Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210366208.XA CN114941318A (en) | 2022-04-08 | 2022-04-08 | Steel pipe-concrete support pile composite pile foundation structure and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| LU505665A1 true LU505665A1 (en) | 2023-12-05 |
| LU505665B1 LU505665B1 (en) | 2024-04-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU505665A LU505665B1 (en) | 2022-04-08 | 2022-08-22 | Composite pile foundation structure of steel pipe-concrete branch piles and construction method thereof |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN114941318A (en) |
| LU (1) | LU505665B1 (en) |
| WO (1) | WO2023193387A1 (en) |
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| CN115492081B (en) * | 2022-09-01 | 2023-08-15 | 广东博竣建设工程有限公司 | Pile forming method for soil cement composite pile of soft soil foundation |
| CN115506343B (en) * | 2022-11-07 | 2023-07-21 | 滁州职业技术学院 | Prefabricated prestressed concrete filled steel tubular column and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3216048B2 (en) * | 1998-08-27 | 2001-10-09 | 日本鋼管株式会社 | Screw-in type steel pipe pile |
| JP2002339352A (en) * | 2001-05-21 | 2002-11-27 | Michiaki Sugawara | Steel pipe pile with enlarged base |
| CN202017199U (en) * | 2011-04-12 | 2011-10-26 | 中国建筑第七工程局有限公司 | Squeezing and expanding device for branch piles |
| CN202031082U (en) * | 2011-04-12 | 2011-11-09 | 中国建筑第七工程局有限公司 | Branch disk pile expanding tool |
| CN103452100A (en) * | 2013-08-20 | 2013-12-18 | 河北建设勘察研究院有限公司 | Construction method of post-grouting squeezing and expanding combination cast-in-place bored pile |
| CN105714774B (en) * | 2014-12-04 | 2018-07-03 | 宫能和 | Diameter changeable agitation machine and its bore forming method, drilling rod |
| CN105908708B (en) * | 2015-03-30 | 2019-02-05 | 荣成市运达基础工程有限公司 | Stir drilling rod, diameter changeable agitation machine and bore forming method |
| CN106087999B (en) * | 2016-03-19 | 2019-05-24 | 王继忠 | It is a kind of to stir the constructing device and its construction method for spraying expanding reinforcing pile |
| CN106592585B (en) * | 2016-12-16 | 2018-10-26 | 兰州理工大学 | A kind of expansion body compaction pile and construction method for eliminating pile foundation negative friction force |
| CN109930597A (en) * | 2019-04-10 | 2019-06-25 | 同济大学浙江学院 | A kind of squeezed formula steel-pipe pile |
| CN110130427B (en) * | 2019-06-13 | 2022-01-21 | 国网江苏省电力有限公司连云港供电分公司 | Method for reinforcing prefabricated hollow pipe pile |
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2022
- 2022-04-08 CN CN202210366208.XA patent/CN114941318A/en active Pending
- 2022-08-22 WO PCT/CN2022/113800 patent/WO2023193387A1/en unknown
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| Publication number | Publication date |
|---|---|
| LU505665B1 (en) | 2024-04-04 |
| WO2023193387A1 (en) | 2023-10-12 |
| CN114941318A (en) | 2022-08-26 |
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