A device for improving the end resistance of a solidified soil composite pipe pile and a construction method thereof
By using deployable end plate devices and ring structures at the ends of steel pipe piles, the contact area at the pile ends is increased, solving the problem of insufficient pile end resistance. This achieves efficient and economical improvement of pile end resistance, ensuring foundation stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SUQIAN SUYUAN IND CO LTD
- Filing Date
- 2026-04-07
- Publication Date
- 2026-06-09
AI Technical Summary
Existing steel pipe piles have insufficient end resistance in deep soft soil layers, leading to failure of the foundation bearing capacity. Furthermore, traditional methods of increasing pile diameter or depth are costly and difficult to implement.
The pile tip surface area is increased by using a ring composed of multiple sector blocks and an expandable end plate device. The solidified soil composite pipe pile is in direct contact with the bearing layer, and the end plate expands under its own weight to enhance the pile tip resistance.
It significantly improves the pile end resistance, enhances the foundation bearing capacity, reduces construction difficulty and cost, and ensures pile stability.
Smart Images
Figure CN122169496A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of construction, specifically to a device and its construction method for improving the end resistance of solidified soil composite pipe piles. Background Technology
[0002] Due to the vast coastal and riverine areas, as well as ancient lake basins in my country, these regions typically possess deep layers of soft soil, such as silt, silty clay, and loose fill. These natural sediments are characterized by high water content, large void ratio, low strength, and high compressibility. For friction-end-bearing piles or end-bearing piles that traverse these deep soft soil layers and are supported on relatively hard bearing layers (such as dense sand, gravel, or weathered rock), the contribution of pile side friction is limited, and the stability and safety of the structure largely depend on the support force provided by the pile ends. Especially in projects bearing enormous vertical loads, such as super high-rise buildings, long-span bridges, heavy industrial plants, and offshore wind power foundations, pile end resistance plays a crucial role, and its magnitude directly determines the foundation's safety reserve. Therefore, taking appropriate measures to increase the end resistance of pipe piles to maintain the stability and solidity of the foundation has significant economic and social benefits. In recent years, although traditional prestressed concrete pipe piles or steel pipe piles have been widely used in the industry, they have some inherent problems in exerting end resistance: such as the depth of the bearing layer and the difficulty of construction. In order to find a better bearing layer, the piles are driven deeper, which may encounter harder layers, making pile driving difficult or even damaging the pile body. Size effect and cost contradiction: simply increasing the pile diameter to improve end bearing capacity will lead to a geometric increase in project cost, which is uneconomical. Summary of the Invention
[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a device and construction method for improving the end resistance of solidified soil composite pipe piles, which can solve the problems mentioned in the background technology. It can effectively solve the problem of insufficient end resistance of existing steel pipe piles and their construction methods, which leads to the failure of the bearing capacity of the foundation.
[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution.
[0005] The present invention provides a device for improving the end resistance of solidified soil composite pipe piles, comprising a cylindrical ring having an annular shape, a ring tightly installed on the inner wall of the cylinder, and an end plate device that can be placed on the ring.
[0006] Specifically, the ring is composed of multiple sector-shaped blocks of equal size, preferably 2-4. By setting multiple sector-shaped blocks, the size and weight of a single component can be effectively reduced, making it easier for workers to handle and assemble. Compared with a single ring, it does not require the use of a crane for handling, reducing the difficulty of placing it into the cylinder and the requirements for handling equipment.
[0007] Furthermore, the cross-section of the fan-shaped block is door-shaped or mouth-shaped, which can effectively cope with external pressure when buried underground, and serves as a reinforcing rib.
[0008] Specifically, the end plate device is composed of three fan-shaped end plate layers of equal length and acute-angled tail ends, from top to bottom: end plate layer one, end plate layer two, and end plate layer three; the tail ends of end plate layer one, end plate layer two, and end plate layer three are movably connected together by a rotating shaft; end plate layer one, end plate layer two, and end plate layer three can be spliced into a complete circle when fully unfolded.
[0009] Furthermore, the end plate layer one and end plate layer three are of the same size, and the number of end plate layer one and end plate layer two is two in each case, which improves the versatility of the components and reduces production costs.
[0010] The second end plate consists of two pieces, each with two symmetrical opening and closing plates. A torsion spring is installed at the tail end of each opening and closing plate, and a limit hole is provided on one side of each plate. The two opening and closing plates are in a retracted state when the limit rod is not pulled out, and the opening and closing plates open when the limit rod is pulled out.
[0011] Furthermore, limit stops are provided on the outer sides of the first and third end plate layers to limit the unfolding angle of the second end plate layer when it is in the open state.
[0012] Furthermore, each of the end plate layer one, end plate layer two, and end plate layer three is provided with corresponding steel bar insertion holes for inserting steel bars during construction.
[0013] The number of the reinforcing bar insertion holes is at least two.
[0014] Furthermore, the upper ends of the reinforcing bars inserted into the reinforcing bar insertion holes on end plate layer one, end plate layer two, and end plate layer three are welded with crossbeams, allowing multiple reinforcing bar insertion holes to be inserted at once during use.
[0015] Specifically, the end plate device is a single circular plate, or a circular plate formed by two semicircles joined together by a hinge; at least one feeding hole is provided on the circular plate.
[0016] The upper edge of the cylinder has multiple through holes for inserting reinforcing bars as needed during construction.
[0017] A construction method for a device to improve the end resistance of solidified soil composite pipe piles is as follows:
[0018] The invention is assembled, with steel bars drilled or directly welded to the lower end of the cylinder, and pipe piles connected to the upper part of the cylinder. In a predetermined area, holes are first formed on the ground by a spiral drilling machine, and a curing agent slurry is injected to mix the in-situ soil below the ground with it to form fluidized solidified soil. The outer periphery of the fluidized solidified soil is natural soil. Then, a prefabricated pipe pile with a device for improving the end resistance of the solidified soil composite pipe pile is placed into the hole and driven by its own weight. When the device for improving the end resistance of the solidified soil composite pipe pile sinks to the bearing layer, the pin is pulled out by the reaction force of the pipe pile's own weight, and the opening and closing plate of the second end plate layer begins to rotate. Under the action of the rebound force of the torsion spring, it gradually unfolds and finally rebounds and is completely fixed inside to form a closed and complete circular end plate device, so that the opening part of the pipe pile end is closed, increasing its surface area.
[0019] The beneficial effects of this invention are as follows: the fully closed end plate connection component can close the open portion at the end of the pipe pile, significantly enhancing the end resistance and bearing capacity of the pipe pile by increasing the surface area at the end of the pipe pile and allowing the lower surface of the end plate to directly contact the solidified soil. Simultaneously, the end plate provides a flat and robust bottom surface, enabling the pipe pile to stand stably in the bearing stratum, better preventing settlement, and allowing the pipe pile to distribute the load more evenly to the underlying bearing stratum, fully utilizing its end bearing capacity. Attached Figure Description
[0020] Figure 1 This is a schematic cross-sectional view of a device for improving the end resistance of a composite pipe pile in solidified soil according to the present invention.
[0021] Figure 2 This is a top view schematic diagram of a device for improving the end resistance of a composite pipe pile in solidified soil according to the present invention. Figure 1 (The end plate device is not deployed);
[0022] Figure 3 This is a top view schematic diagram of a device for improving the end resistance of a composite pipe pile in solidified soil according to the present invention. Figure 2 (Endplate device unfolds);
[0023] Figure 4 This is a schematic diagram of the third layer of the end plate in the device for improving the end resistance of a composite pipe pile in solidified soil according to the present invention.
[0024] Figure 5 This is a schematic diagram of the structure of the first end plate layer in the device for improving the end resistance of solidified soil composite pipe piles according to the present invention (left side is the spliced state, right side is the disassembled state).
[0025] Figure 6 This is a three-dimensional structural diagram of the end plate layer one and end plate layer three in the device for improving the end resistance of solidified soil composite pipe piles according to the present invention (excluding end plate layer two between end plate layer one and end plate layer three).
[0026] Figure 7 This is a three-dimensional schematic diagram of a single sector block forming a ring in a device for improving the end resistance of a solidified soil composite pipe pile according to the present invention.
[0027] Figure 8 This is a schematic diagram of the construction state of a device for improving the end resistance of a solidified soil composite pipe pile according to the present invention. Detailed Implementation
[0028] A device for improving the end resistance of solidified soil composite pipe piles, such as Figures 1-8 As shown, it includes a cylindrical tube 1 with an annular shape, a ring 2 tightly installed on the inner wall of the cylindrical tube 1, and an end plate device 3 can be placed on the ring 2.
[0029] Specifically, the ring 2 is composed of multiple sector blocks 2-1 of equal size, preferably 2-4. By setting multiple sector blocks 2-1, the size and weight of a single component can be effectively reduced, making it easier for workers to handle and assemble. Compared with a single ring, it does not require the use of a crane for handling, reducing the difficulty of placing it into the cylinder 1 and the requirements for handling equipment.
[0030] Further, refer to the appendix Figure 7 The cross-section of the fan-shaped block 2-1 is door-shaped or mouth-shaped, which can effectively cope with external pressure when buried underground and serve as a reinforcing rib.
[0031] Specifically, refer to the appendix Figures 2-5 The end plate device 3 is composed of three fan-shaped end plate layers 3-1, 3-2, and 3-3 of equal length with acute-angled tail ends, arranged from top to bottom. The tail ends of the end plate layers 3-1, 3-2, and 3-3 are movably connected together by a pivot 3-4. When fully unfolded, the end plate layers 3-1, 3-2, and 3-3 can be spliced into a complete circle.
[0032] Furthermore, the end plate layer 1 3-1 and end plate layer 3-3 are of the same size, and there are two end plate layers 1 and 2 each, which improves the versatility of the components and reduces production costs.
[0033] The second end plate layer 3-2 consists of two pieces. The second end plate layer 3-2 has two symmetrical opening and closing plates 3-2-1. A torsion spring 3-2-2 is installed at the tail end of the opening and closing plate 3-2-1. A limit insertion hole 3-5 is provided on one side of the opening and closing plate 3-2-1. The two opening and closing plates 3-2-1 are in a retracted state when the limit rod is not pulled out. When the limit rod 3-7 is pulled out, the opening and closing plates 3-2-1 open.
[0034] Furthermore, limit stops are provided on the outer sides of end plate layer 3-1 and end plate layer 3-3 to limit the unfolding angle of end plate layer 3-2 when end plate layer 3-2 is in the open state.
[0035] Furthermore, each of the end plate layer 3-1, end plate layer 3-2, and end plate layer 3-3 is provided with a corresponding steel bar insertion hole 3-6 for inserting steel bars during construction.
[0036] The number of the steel bar insertion holes 3-6 is at least two.
[0037] Further, refer to the appendix Figure 6 The upper end of the reinforcing bars 3-6 inserted into the reinforcing bar insertion holes 3-6 on end plate layer 1 3-1, end plate layer 2 3-2 and end plate layer 3 3-3 is welded with a crossbeam. When in use, multiple reinforcing bars can be inserted into the insertion holes 3-6 at one time. Through holes can also be set in the crossbeam to insert the limiting rod 3-7.
[0038] Specifically, the end plate device 3 is a single circular plate, or a circular plate formed by two semicircles joined together by a hinge; at least one feeding hole is provided on the circular plate, which can be used to feed solidified soil downward as needed during construction.
[0039] The upper edge of the cylinder 1 has multiple through holes 1-1 for inserting reinforcing bars as needed during construction.
[0040] A construction method for a device to improve the end resistance of solidified soil composite pipe piles is as follows:
[0041] See attached document Figure 8 The invention is assembled, and steel bars 1-2 are drilled or directly welded to the lower end of the cylinder 1. Pipe piles 4 are connected to the upper part of the cylinder 1. In a predetermined area, a hole is first formed on the ground by a spiral drilling machine and a curing agent slurry is injected to mix the in-situ soil below the ground with it to form a fluidized solidified soil 5. The outer periphery of the fluidized solidified soil is natural soil 6. Then, a prefabricated pipe pile with a device for improving the end resistance of the solidified soil composite pipe pile is placed into the hole and driven by its own weight. When the device for improving the end resistance of the solidified soil composite pipe pile sinks to the bearing layer 5, the pin is pulled out by the reaction force of the self-weight of the pipe pile 4. The opening and closing plate 3-2-1 of the end plate layer 2 3-2 begins to rotate and gradually unfolds under the action of the rebound force of the torsion spring 3-2-2. Finally, it can rebound and be completely fixed inside to form a closed and complete circular end plate device 3, so that the opening part of the pipe pile end is closed and its surface area is increased.
[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A device for improving the end resistance of solidified soil composite pipe piles, characterized in that, It includes a ring-shaped cylinder, with the ring tightly attached to the inner wall of the cylinder, and an end plate device can be placed on the ring.
2. The device for improving the end resistance of solidified soil composite pipe piles according to claim 1, characterized in that, The ring is composed of multiple sector-shaped blocks of equal size, with a quantity of 2-4 blocks.
3. The device for improving the end resistance of solidified soil composite pipe piles according to claim 2, characterized in that, The cross-section of the fan-shaped block is door-shaped or mouth-shaped.
4. The device for improving the end resistance of solidified soil composite pipe piles according to claim 1, characterized in that, The end plate device consists of three fan-shaped end plate layers of equal length and acute-angled tail ends, from top to bottom: end plate layer one, end plate layer two, and end plate layer three. The tail ends of end plate layer one, end plate layer two, and end plate layer three are movably connected together by a rotating shaft. End plate layer one, end plate layer two, and end plate layer three can be spliced into a complete circle when fully unfolded.
5. The device for improving the end resistance of solidified soil composite pipe piles according to claim 4, characterized in that, The end plate layer one and end plate layer three have the same dimensions.
6. The device for improving the end resistance of solidified soil composite pipe piles according to claim 4, characterized in that, The second end plate consists of two pieces, each with two symmetrical opening and closing plates. A torsion spring is installed at the tail end of each opening and closing plate, and a limit hole is provided on one side of each plate. The two opening and closing plates are in a retracted state when the limit rod is not pulled out, and the opening and closing plates open when the limit rod is pulled out.
7. The device for improving the end resistance of solidified soil composite pipe piles according to claim 4, characterized in that, Limiting blocks are provided on the outer sides of end plate layer one and end plate layer three to limit the unfolding angle of end plate layer two when end plate layer two is in the open state.
8. The device for improving the end resistance of solidified soil composite pipe piles according to claim 4, characterized in that, The end plate layer one, end plate layer two and end plate layer three are also provided with corresponding steel bar insertion holes for inserting steel bars during construction.
9. The device for improving the end resistance of solidified soil composite pipe piles according to claim 8, characterized in that, The upper ends of the reinforcing bars inserted into the reinforcing bar insertion holes on end plate layer one, end plate layer two and end plate layer three are welded with crossbeams. Multiple reinforcing bars can be inserted into the insertion holes at one time. Through holes can also be set in the crossbeams to insert limiting rods.
10. The device for improving the end resistance of solidified soil composite pipe piles according to claim 1, characterized in that, The end plate device is a single circular plate, or a circular plate formed by two semicircles joined together by a hinge; at least one feeding hole is provided on the circular plate.
11. The device for improving the end resistance of solidified soil composite pipe piles according to claim 1, characterized in that, The upper edge of the cylinder has multiple through holes for inserting reinforcing bars as needed during construction.
12. A construction method for a device to improve the end resistance of a composite pipe pile in solidified soil, characterized by: The invention is assembled, with steel bars drilled or directly welded to the lower end of the cylinder, and pipe piles connected to the upper part of the cylinder. In a predetermined area, holes are first formed on the ground by a spiral drilling machine, and a curing agent slurry is injected to mix the in-situ soil below the ground with it to form fluidized solidified soil. The outer periphery of the fluidized solidified soil is natural soil. Then, a prefabricated pipe pile with a device for improving the end resistance of the solidified soil composite pipe pile is placed into the hole and driven by its own weight. When the device for improving the end resistance of the solidified soil composite pipe pile sinks to the bearing layer, the pin is pulled out by the reaction force of the pipe pile's own weight, and the opening and closing plate of the second end plate layer begins to rotate. Under the action of the rebound force of the torsion spring, it gradually unfolds and finally rebounds and is completely fixed inside to form a closed and complete circular end plate device, so that the opening part of the pipe pile end is closed, increasing its surface area.