A press-in steel pipe pile with expanded base for construction engineering
By expanding the pile bottom area using the extrusion and expansion components of the press-type steel pipe expanded-base pile, the problem of insufficient pull-out resistance of traditional pile foundations is solved, achieving efficient pull-out resistance and bearing capacity of the pile body, which is suitable for complex environments in building engineering.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LANZHOU JIAOTONG UNIV
- Filing Date
- 2025-11-05
- Publication Date
- 2026-07-24
AI Technical Summary
Traditional pile foundations are insufficient in terms of pull-out resistance in high embankment buildings, slope protection projects, anti-buoyancy structures for underground garages, and large-span cantilever buildings. The piles are prone to floating and foundation displacement, making it difficult to meet the load requirements in complex engineering environments.
The pile is constructed using a pressure column type steel pipe expanded pile. By setting an expansion component at the bottom of the pile, the cone tip of the pressure column is used to squeeze the pile tip slider to expand, thereby increasing the pile bottom area. Combined with a limiting structure to restrict the movement of the slider, the pile diameter can be expanded in a controllable manner.
It significantly improves the pull-out resistance and bearing capacity of pile foundations, has a simple structure, high construction efficiency, good economic benefits, and meets the load requirements of complex engineering environments.
Smart Images
Figure CN224549097U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of building construction, and specifically relates to a pressure-type steel pipe expanded-base pile for building engineering. Background Technology
[0002] In the field of building construction, pile foundations, as key components for transferring the load of the superstructure to deep, stable soil layers, directly determine the safety, stability, and durability of the entire building system through their pull-out resistance and bearing capacity. Especially in scenarios such as high-fill buildings, slope protection projects, anti-buoyancy structures for underground parking garages, and large-span cantilever buildings, traditional equal-diameter cast-in-place piles or precast piles often suffer from insufficient pull-out resistance due to the limited contact area between the pile bottom and the soil layer. This can easily lead to safety hazards such as pile uplift and foundation displacement, making it difficult to meet the load requirements of complex engineering environments. Utility Model Content
[0003] This utility model proposes a pressure-type steel pipe expanded-base pile for building engineering. By optimizing the structure of the pile foundation bottom range, the pile diameter can be controlled to expand, thereby solving the problem of weak pull-out resistance and bearing capacity of traditional pile foundations.
[0004] Therefore, the present invention adopts the following technical solution: A type of steel pipe expanded-base pile for building construction includes a pressure column, a column body, and an expansion assembly; The compression bar is a round bar structure with a tapered head, forming a cone tip. The pile body is cylindrical, with the inner diameter of the cylinder being larger than the diameter of the compression rod. The compression rod is vertically inserted into the cylinder of the pile body, and the length of the compression rod is greater than the length of the pile body. The lower end of the pile is connected to an expansion assembly. The cone tip of the pressure rod column squeezes the expansion assembly to complete the pile expansion.
[0005] Furthermore, the extrusion and expansion assembly includes an expansion structure and a limiting structure. The expansion structure includes a cylindrical body with a tapered lower end. The outer diameter and inner diameter of the cylindrical body are equal to the pile body, and the cylindrical body is fixed to the lower end of the pile body. A horizontal guide channel is provided inside the cylinder, running through the left and right sides of the cylinder. The one on the left is the left guide channel, and the one on the right is the right guide channel. The two guide channels are respectively connected to the pile tip sliders, namely the left pile tip slider and the right pile tip slider, which are arranged side by side. The cone tip of the pressure rod column is inserted between the two pile tip sliders, pushing the two pile tip sliders to move to both sides and extend out of the cylinder. The limiting structure is located between the cylinder and the pile tip sliders to limit the maximum lateral movement distance of the pile tip sliders.
[0006] Furthermore, the specific structure of the limiting structure is as follows: a rectangular guide groove is provided on the surface of the pile tip slider, and a horizontal limiting rod is inserted in the guide groove. The front and rear ends of the limiting rod are fixed to the cylindrical body. A buckle is provided in the guide groove. When the pile tip slider moves outward, the limiting rod moves from one side of the buckle to the other side, and the buckle restricts the return movement of the limiting rod, thereby completing the limiting.
[0007] Furthermore, the fastener includes a groove, a fixing block, a spring, and a limiting plate. The groove is located on the top and bottom surfaces of the guide groove, and the spring is located inside the groove. The top of the spring is connected to the fixing block, and the bottom is connected to the limiting plate. The limiting plate has a wedge-shaped structure, with the left side of the limiting plate protruding into the guide groove and the right side of the limiting plate hinged in the groove. When the limiting rod moves outward, it squeezes the limiting plate, causing the spring to contract, and the left side of the limiting plate retracts into the groove. After the limiting rod moves to the outermost position, the spring pops the limiting plate out, preventing the limiting rod from moving to the right.
[0008] Furthermore, when the pile tip slider is not expanded, the outer surface of the pile tip slider is flush with the surface of the cylindrical body.
[0009] Furthermore, the lower end of the pile tip slider also adopts a conical structure to match the cylindrical body.
[0010] Furthermore, a conical notch is made between the left and right pile tip sliders, and the cone tip of the pressure rod is inserted into the notch to push the pile tip slider outward.
[0011] The beneficial effects of this utility model are as follows: 1. Compared with existing precast steel pipe piles, the present invention expands the pile tip slider with the internal extrusion and expansion component, thereby increasing the pile bottom area and solving the problems of insufficient bearing capacity and pull-out resistance encountered in precast pile foundation projects.
[0012] 2. This utility model can be used to inject grout inside the steel pipe pile according to the needs of the project, thereby further expanding the bearing capacity of the pile foundation and strengthening the pile foundation structure.
[0013] 3. This utility model has a simple structure, is easy to operate, significantly improves construction efficiency, and has good economic efficiency. Attached Figure Description
[0014] Figure 1 This is a structural schematic diagram of the expanded-base pile of this utility model; Figure 2 This is a structural breakdown diagram of the expanded-base pile of this utility model; Figure 3 This is a schematic diagram of the structure of the extrusion expansion component of this utility model; Figure 4 This is a schematic diagram of the limiting structure of this utility model. Figure 1 ; Figure 5 This is a schematic diagram of the limiting structure of this utility model. Figure 2 ; In the picture: 1-Compression bar column, 2-Column body, 3-Extrusion expansion assembly; 11-The tip of the cone; 21-Cylindrical body; 31 - Right pile tip slider; 32 - Left pile tip slider; 33-Limiting structure; 331-Fixing block; 332-Spring; 333-Limiting plate; 334-Limiting rod. Detailed Implementation
[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figure 1 and 2 As shown, a type of steel pipe expanded-base pile for building construction includes a pressure rod column 1, a pile body 2, and an expansion assembly 3. The pressure rod column 1 is a cylindrical structure with a tapered head forming a cone tip 11. The pile body is cylindrical, with an inner diameter slightly larger than the diameter of the pressure rod column 1. The pressure rod column 1 is vertically inserted into the cylindrical pile body, and its length is greater than the length of the pile body. The lower end of the pile body is connected to the expansion assembly 3. The cone tip 11 of the pressure rod column 1 compresses and expands the expansion assembly 3, completing the pile expansion.
[0016] like Figure 3 and 4 As shown, the expansion assembly 3 includes an expansion structure and a limiting structure 33. The expansion structure includes a cylindrical body 21, the lower end of which is tapered. The outer and inner diameters of the cylindrical body 21 are equal to the pile body, and the cylindrical body 21 is welded to the lower end of the pile body. A horizontal guide channel is provided inside the cylindrical body 21, running through both sides of the cylindrical body 21. The cross-section of the guide channel is rectangular, with the one on the left being the left guide channel and the one on the right being the right guide channel. Rectangular block-shaped pile tip sliders, namely the left pile tip slider 32 and the right pile tip slider 31, are connected to the two guide channels respectively, and the two pile tip sliders are arranged side by side. The conical tip of the pressure rod column 1 is inserted between the two pile tip sliders, pushing the two pile tip sliders to move to both sides and extend outside the cylindrical body 21. The limiting structure 33 is located between the cylindrical body 21 and the pile tip sliders, and is used to limit the maximum lateral movement distance of the pile tip sliders.
[0017] like Figure 4 and 5As shown, the specific structure of the limiting structure 33 is as follows: a rectangular guide groove is formed on the surface of the pile tip slider, and a horizontal limiting rod 334 passes through the guide groove. The front and rear ends of the limiting rod 334 are fixed to the cylindrical body 21. A fastening element is provided in the guide groove. When the pile tip slider moves outward, the limiting rod 334 moves from one side of the fastening element to the other side, and the fastening element restricts the return movement of the limiting rod 334, thereby completing the limiting. The fastener includes a groove, a fixing block 331, a spring 332, and a limiting plate 333. The groove is located on the top and bottom surfaces of the guide groove. The spring 332 is located inside the groove. The top of the spring 332 is connected to the fixing block 331, and the bottom is connected to the limiting plate 333. The limiting plate 333 has a wedge-shaped structure. The left side of the limiting plate 333 protrudes into the guide groove, and the right side of the limiting plate 333 is hinged in the groove. When the limiting rod 334 moves outward, it squeezes the limiting plate 333, causing the spring 332 to retract, and the left side of the limiting plate 333 retracts into the groove. After the limiting rod 334 moves to the outermost position, the spring 332 pops out the limiting plate 333, preventing the limiting rod 334 from moving to the right.
[0018] Furthermore, to facilitate the installation of steel pipe piles, when the pile tip slider is not expanded, its outer surface is flush with the surface of the cylindrical body 21. Additionally, the lower end of the pile tip slider also adopts a conical structure to fit the cylindrical body 21. To facilitate the pressing operation of the pressure rod 1, a conical notch is opened between the left pile tip slider 32 and the right pile tip slider 31. The conical tip 11 of the pressure rod 1 is inserted into the notch and presses outward to push the pile tip slider.
[0019] The construction method of this utility model is as follows: In the construction area, after drilling the pile hole, the entire column 2 is placed into the pile hole, and then the pressure rod column 1 is placed into the pile body and brought close to the pile tip slider. A press is used to continuously release and increase the pressure on the pressure rod column 1, causing the top of the pressure rod column 1 to descend to the preset position, and the pile tip slider to expand to both ends. After the expansion is completed and the limiting structure 33 is successfully stabilized and limited, the pressure rod is pulled out, and plain concrete is poured into the pile foundation to complete the construction.
Claims
1. A type of steel pipe pile with expanded base for pressure column construction, characterized in that, It includes a pressure bar column (1), a column body (2), and an extrusion expansion assembly (3); The compression bar (1) is a round bar structure. The head end of the compression bar (1) is conical, and the conical head end forms a cone tip (11). The pile body is cylindrical, and the inner diameter of the cylinder of the pile body is larger than the diameter of the pressure rod column (1). The pressure rod column (1) is vertically inserted into the cylinder of the pile body, and the length of the pressure rod column (1) is greater than the length of the pile body. The lower end of the pile body is connected to the expansion component (3), and the cone tip (11) of the pressure rod column (1) squeezes the expansion component (3) to complete the expansion of the pile.
2. The type of steel pipe pile with expanded base for building construction as described in claim 1, characterized in that, The extrusion and expansion assembly (3) includes an expansion structure and a limiting structure (33). The expansion structure includes a cylindrical body (21). The lower end of the cylindrical body (21) is conical. The outer diameter and inner diameter of the cylindrical body (21) are equal to the pile body. The cylindrical body (21) is fixed to the lower end of the pile body. A horizontal guide channel is provided inside the cylindrical body (21). The guide channel runs through the left and right sides of the cylindrical body (21). The one on the left is the left guide channel and the one on the right is the right guide channel. The two guide channels are respectively connected to the pile tip sliders, namely the left pile tip slider (32) and the right pile tip slider (31). The two pile tip sliders are arranged side by side. The cone tip of the pressure rod column (1) is inserted between the two pile tip sliders, pushing the two pile tip sliders to move to both sides and extending out of the cylindrical body (21). The limiting structure (33) is located between the cylindrical body (21) and the pile tip slider, and is used to limit the maximum lateral movement distance of the pile tip slider.
3. The type of steel pipe pile with expanded base for building construction as described in claim 2, characterized in that, The specific structure of the limiting structure (33) is as follows: a rectangular guide groove is provided on the surface of the pile tip slider, and a horizontal limiting rod (334) is inserted in the guide groove. The front and rear ends of the limiting rod (334) are fixed on the cylindrical body (21). A buckle is provided in the guide groove. When the pile tip slider moves outward, the limiting rod (334) moves from one side of the buckle to the other side, and the buckle restricts the limiting rod (334) from moving back, thereby completing the limiting.
4. The type of steel pipe pile with expanded base for building construction as described in claim 3, characterized in that, The fastener includes a groove, a fixing block (331), a spring (332), and a limiting plate (333). The groove is located on the top and bottom surfaces of the guide groove. The spring (332) is located in the groove. The top of the spring (332) is connected to the fixing block (331), and the bottom is connected to the limiting plate (333). The limiting plate (333) has a wedge-shaped structure. The left side of the limiting plate (333) protrudes into the guide groove, and the right side of the limiting plate (333) is hinged in the groove. When the limiting rod (334) moves outward, it squeezes the limiting plate (333) and causes the spring (332) to retract. The left side of the limiting plate (333) is retracted into the groove. After the limiting rod (334) moves to the outermost position, the spring (332) pops out the limiting plate (333) to prevent the limiting rod (334) from moving to the right.
5. The type of steel pipe pile with expanded base for building construction as described in claim 4, characterized in that, When the pile tip slider is not expanded, the outer surface of the pile tip slider is flush with the surface of the cylindrical body (21).
6. The type of steel pipe pile with expanded base for building construction as described in claim 5, characterized in that, The lower end of the pile tip slider also adopts a conical structure, which is compatible with the cylindrical body (21).
7. A type of steel pipe pile with expanded base for building construction as described in claim 6, characterized in that, A conical notch is opened between the left pile tip slider (32) and the right pile tip slider (31), and the cone tip (11) of the pressure rod column (1) is inserted into the notch to push the pile tip slider outward.