Prestressed variable-diameter pipe pile

Abstract

This application relates to a prestressed variable-diameter pipe pile, belonging to the field of building foundation engineering technology. It includes a first pile body assembly, a variable-diameter assembly, a second pile body assembly, and prestressed steel reinforcement. This application, through the coordinated design of the first pile body assembly, the variable-diameter assembly, the second pile body assembly, and the prestressed steel reinforcement, has significant advantages over existing technologies. The upper annular reinforcing bars, the variable-diameter annular reinforcing bars, and the lower annular reinforcing bars are welded to the prestressed steel reinforcement to form a three-dimensional skeleton. Combined with the segmented arrangement of the prestressed steel reinforcement, the vertical and inclined sections are adapted to the angle of the variable-diameter pile, eliminating the problem of stress concentration in the pile body. The gradual structure of the variable-diameter pile and the spiral ribs on its outer surface, combined with the base and anchoring cone, significantly enhance the pile-soil interaction and improve the overall bearing capacity. The equal diameter design of the upper and lower pile body simplifies the prefabrication process, the inclined support plate and reserved installation holes improve adaptability to complex geological conditions, and the anti-corrosion sealing plate ensures durability.

Description

Technical Field

[0001] This application relates to the field of building foundation engineering technology, and in particular to a prestressed variable diameter pipe pile. Background Technology

[0002] Currently, in the field of construction engineering, pipe piles are widely used as an important foundation component in the foundation treatment of various buildings. Traditional pipe piles are mostly designed with a constant diameter, and their bearing capacity and pull-out resistance are limited by the cross-sectional area of ​​the pile body and the strength of the material.

[0003] In recent years, with the development of high-rise buildings and long-span bridges, higher requirements have been placed on the bearing capacity and deformation control of pipe piles. The introduction of prestressed technology has improved the performance of pipe piles to some extent, but problems such as uneven stress distribution in the pile body and insufficient pile-soil interaction still exist. In addition, existing pipe piles have poor adaptability to complex geological conditions and are difficult to meet engineering requirements. To solve the above problems, a prestressed variable diameter pipe pile is proposed. Utility Model Content

[0004] The purpose of this application is to provide a prestressed variable diameter pipe pile that solves the problems of local stress concentration caused by uneven stress distribution in the pile body and insufficient bearing capacity caused by insufficient pile-soil interaction.

[0005] This application provides a prestressed variable diameter pipe pile with the following technical solution: A prestressed variable diameter pipe pile includes a first pile body assembly, a variable diameter assembly, a second pile body assembly, and prestressed steel bars. The first pile body assembly includes an upper pile body, the interior of which is provided with uniformly distributed upper annular reinforcing ribs. The variable diameter assembly includes a variable diameter pile fixedly connected to the bottom end of the upper pile body, the interior of which is provided with uniformly distributed variable diameter annular reinforcing ribs, and the outer surface of which is fixedly connected with uniformly distributed spiral ribs. The second pile body assembly includes a lower pile body fixedly connected to the bottom end of the variable diameter pile, the interior of which is provided with uniformly distributed lower annular reinforcing ribs. The prestressed steel bars sequentially penetrate the first pile body assembly, the variable diameter assembly, and the second pile body assembly, and both ends of the prestressed steel bars are respectively anchored to the top of the first pile body assembly and the bottom of the second pile body assembly. Multiple upper annular reinforcing ribs, variable diameter annular reinforcing ribs, and lower annular reinforcing ribs are welded to the outer surface of the prestressed steel bars.

[0006] By adopting the above technical solution, the upper annular reinforcing bars, the variable-diameter annular reinforcing bars, and the lower annular reinforcing bars are all welded to the outer surface of the prestressed steel bars, forming a three-dimensional skeleton for synergistic stress distribution. This allows the prestress of the prestressed steel bars to be evenly transferred to the upper pile body, the variable-diameter pile, and the lower pile body, avoiding local stress concentration in the pile body and solving the problem of uneven stress distribution in traditional pipe piles. The variable-diameter design of the variable-diameter pile, combined with the spiral ribs on the outer surface, increases the contact area and frictional resistance with the soil, enhances the pile-soil interaction, improves the overall bearing capacity of the pipe pile, and alleviates the problem of insufficient bearing capacity caused by insufficient pile-soil interaction. At the same time, the prestressed steel bars run through each component and are anchored at both ends. The first pile body component, the variable-diameter component, and the second pile body component form an integral load-bearing structure, improving the stability of the pipe pile in soft soil foundations. Moreover, each component can be prefabricated and assembled, simplifying the construction process and meeting the requirements of practicality and efficiency.

[0007] Preferably, the top end of the upper pile section is fixedly connected to an upper prestressed connecting plate, the bottom end of the lower pile section is fixedly connected to a lower prestressed connecting plate, and both ends of the prestressed steel bar are respectively connected to the upper prestressed connecting plate and the lower prestressed connecting plate.

[0008] By adopting the above technical solution, the upper and lower prestressed connecting plates can form rigid anchorage constraints on both ends of the prestressed steel bars, ensuring that the prestress of the prestressed steel bars can be stably transmitted to the first and second pile body components, avoiding stress loss due to anchorage loosening, optimizing the overall stress distribution of the pile body, and alleviating the problem of local stress concentration.

[0009] Preferably, a bearing platform connecting plate is fixedly connected to the upper surface of the upper prestressed connecting plate, and the bearing platform connecting plate has evenly distributed bearing platform connecting holes.

[0010] By adopting the above technical solution, the pile cap connecting plate can serve as the connection medium between the first pile body component and the upper pile cap. The pile cap connecting hole facilitates the rapid fixing of the two through bolts and other connectors, which simplifies the connection process between the pipe pile and the upper structure, solves the problems of complex connection and low construction efficiency of existing pipe pile and pile cap connections, and enhances the stability of the connection.

[0011] Preferably, the bottom surface of the pier connecting plate is welded with multiple inclined support plates, and the other end of each of the multiple inclined support plates is fixedly connected to the outer surface of the upper pile body.

[0012] By adopting the above technical solution, the inclined support plate can form a triangular support structure between the pile cap connecting plate and the upper pile body, which will distribute the load transmitted by the upper pile cap to the outer surface of the upper pile body, avoid cracking at the connection between the pile cap connecting plate and the upper pile body due to stress concentration, and improve the overall bearing capacity of the first pile body component.

[0013] Preferably, the top of the upper pile body is provided with a reserved installation hole for connecting an external diagonal brace.

[0014] By adopting the above technical solution, the reserved installation hole can be used to install external diagonal bracing rods. During the construction or use of the pipe pile, the diagonal bracing rods form lateral support for the first pile body component, reducing the tilting of the pipe pile caused by lateral forces in soft soil foundations, improving the stability of the pipe pile under complex geological conditions, and solving the problem of existing pipe piles being prone to tilting in soft soil foundations.

[0015] Preferably, the bottom surface of the lower prestressed connecting plate is fixedly connected to an anti-corrosion sealing plate, the bottom surface of the anti-corrosion sealing plate is fixedly connected to a chassis, and the bottom surface of the chassis is welded with uniformly distributed anchoring cones.

[0016] By adopting the above technical solutions, the anti-corrosion sealing plate can form a sealed protection for the bottom anchorage end of the lower prestressed connection plate and prestressed steel bars, reducing the erosion of groundwater or corrosive media and improving durability; the chassis and anchoring cone can increase the contact area and embedment depth between the second pile component and the foundation, enhance the pile end anchorage force of the pipe pile, improve the overall bearing capacity, and solve the problem of insufficient pile-soil interaction.

[0017] Preferably, the prestressed steel bar includes a vertical section located in the first pile body assembly, an inclined section located in the diameter-changing assembly, and a vertical section located in the second pile body assembly, and the inclination angle of the inclined section is consistent with the diameter-changing angle of the diameter-changing pile.

[0018] By adopting the above technical solutions, the segmented setting of prestressed steel bars can adapt to the structural form of variable diameter piles. The inclined section and the angle of the diameter change can avoid the bending stress of the prestressed steel bars at the diameter change, so that the prestress can be smoothly transmitted along the prestressed steel bars, eliminate the local stress concentration caused by the sudden change of the direction of the prestressed steel bars, optimize the stress distribution of the pile body, and improve the crack resistance of the pipe pile.

[0019] Preferably, the upper pile body and the upper annular reinforcing bar are designed with equal diameters, the diameter of the prestressed steel bar gradually increases from top to bottom, and the inner diameter of the prestressed steel bar gradually changes with the outer diameter.

[0020] By adopting the above technical solutions, the design of equal diameter for the upper and lower pile sections can simplify the prefabrication mold and reduce construction costs; the gradual change in diameter and synchronous gradual change in inner hole of the variable diameter pile can avoid stress concentration caused by sudden changes in wall thickness. Combined with the variable diameter ring reinforcement, stress can be further dispersed. At the same time, the variable diameter structure can enhance the interaction between the pile body and the soil, improve the bearing capacity, and solve the problems of uneven stress distribution and insufficient bearing capacity of existing pipe piles.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] This new type of prestressed variable-diameter pipe pile, through the coordinated design of the first pile body assembly, the variable-diameter assembly, the second pile body assembly, and the prestressed steel reinforcement, has significant advantages over existing technologies. The upper annular reinforcing bars, the variable-diameter annular reinforcing bars, and the lower annular reinforcing bars are welded to the prestressed steel reinforcement to form a three-dimensional skeleton. With the segmented setting of the prestressed steel reinforcement, the vertical and inclined sections are adapted to the angle of the variable-diameter pile, eliminating the problem of stress concentration in the pile body. The gradual structure of the variable-diameter pile and the spiral ribs on the outer surface, combined with the base and anchoring cone, greatly enhance the pile-soil interaction and improve the overall bearing capacity. The equal diameter design of the upper and lower pile bodies simplifies the prefabrication process. The inclined support plate and the reserved installation holes improve adaptability to complex geological conditions. The anti-corrosion sealing plate ensures durability. The upper prestressed connection plate, the lower prestressed connection plate, and the pile cap connection plate optimize the force transmission and connection stability, comprehensively solving the defects of existing pipe piles. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall front view structure of this application;

[0024] Figure 2 This is a schematic diagram of the overall planar structure of this application;

[0025] Figure 3 This is a schematic diagram of the first partial cross-sectional structure of this application;

[0026] Figure 4 This is a schematic diagram of the second partial cross-sectional structure of this application;

[0027] Figure 5 This is a schematic diagram of the steel reinforcement cage structure of this application.

[0028] In the picture:

[0029] 1. First pile body assembly; 101. Upper pile body; 102. Upper ring reinforcing bar; 103. Upper prestressed connection plate; 104. Pier cap connection plate; 105. Pier cap connection hole; 106. Inclined support plate; 107. Reserved installation hole; 2. Variable diameter assembly; 201. Variable diameter pile; 202. Variable diameter ring reinforcing bar; 203. Spiral rib; 3. Second pile body assembly; 301. Lower pile body; 302. Lower ring reinforcing bar; 303. Lower prestressed connection plate; 304. Anti-corrosion sealing plate; 305. Base plate; 306. Anchor cone; 4. Prestressed steel bars. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be described in further detail below.

[0031] Example 1: A prestressed variable diameter pipe pile, referring to Figure 1 , Figure 2 and Figure 5The system includes a first pile body assembly 1, a diameter-reducing assembly 2, a second pile body assembly 3, and prestressed steel bars 4. The first pile body assembly 1 includes an upper pile body 101, with evenly distributed upper annular reinforcing ribs 102 inside. The diameter-reducing assembly 2 includes a diameter-reducing pile 201 fixedly connected to the bottom end of the upper pile body 101, with evenly distributed diameter-reducing annular reinforcing ribs 202 inside. Evenly distributed spiral ribs 203 are fixedly connected to the outer surface of the diameter-reducing pile 201. The second pile body assembly 3 includes a lower pile body 301 fixedly connected to the bottom end of the diameter-reducing pile 201, with evenly distributed lower annular reinforcing ribs 302 inside. The prestressed steel bars 4 sequentially pass through the first pile body assembly 1, the diameter-reducing assembly 2, and the second pile body assembly 3, with both ends of the prestressed steel bars 4 anchored to the first pile body assembly. At the top of the first pile body 1 and the bottom of the second pile body component 3, multiple upper annular reinforcing bars 102, variable diameter annular reinforcing bars 202, and lower annular reinforcing bars 302 are welded to the outer surface of the prestressed steel bars 4. The top of the upper pile body 101 is fixedly connected to the upper prestressed connecting plate 103, and the bottom of the lower pile body 301 is fixedly connected to the lower prestressed connecting plate 303. The two ends of the prestressed steel bars 4 are respectively connected to the upper prestressed connecting plate 103 and the lower prestressed connecting plate 303. The upper prestressed connecting plate 103 and the lower prestressed connecting plate 303 can form a rigid anchorage constraint on the two ends of the prestressed steel bars 4, ensuring that the prestress of the prestressed steel bars 4 can be stably transmitted to the first pile body component 1 and the second pile body component 3, avoiding stress loss due to anchorage loosening, optimizing the overall stress distribution of the pile body, and alleviating the problem of local stress concentration.

[0032] Reference Figure 3 , Figure 4 and Figure 5The prestressed steel bar 4 includes a vertical section located in the first pile body assembly 1, an inclined section located in the diameter-changing assembly 2, and a vertical section located in the second pile body assembly 3. The inclination angle of the inclined section is consistent with the diameter-changing angle of the diameter-changing pile 201. The segmented arrangement of the prestressed steel bar 4 can adapt to the structural form of the diameter-changing pile 201. The consistency between the inclined section and the diameter-changing angle can avoid the prestressed steel bar 4 from generating bending stress at the diameter-changing point, so that the prestress can be smoothly transmitted along the prestressed steel bar 4, eliminating the local stress concentration caused by the abrupt change in the orientation of the prestressed steel bar 4, optimizing the stress distribution of the pile body, and improving the crack resistance of the pipe pile. The upper pile body 1 The upper section of the pile 101 and the upper section of the ring reinforcing bar 102 are designed with equal diameters. The diameter of the prestressed steel bar 4 gradually increases from top to bottom, and the inner diameter of the prestressed steel bar 4 changes synchronously with the outer diameter. The equal diameter design of the upper section of the pile body 101 and the lower section of the pile body 301 can simplify the prefabrication mold and reduce the construction cost. The diameter of the variable-diameter pile 201 gradually changes and the inner diameter changes synchronously, which can avoid stress concentration caused by sudden changes in wall thickness. Combined with the variable-diameter ring reinforcing bar 202, stress can be further dispersed. At the same time, the variable-diameter structure can enhance the interaction between the pile body and the soil, improve the bearing capacity, and solve the problems of uneven stress distribution and insufficient bearing capacity of existing pipe piles.

[0033] Example 2: A prestressed variable diameter pipe pile, referring to Figure 1 , Figure 2 and Figure 3 Based on the same concept as Embodiment 1 above, this embodiment proposes that a foundation connecting plate 104 is fixedly connected to the upper surface of the upper prestressed connecting plate 103. The foundation connecting plate 104 has evenly distributed foundation connecting holes 105. The foundation connecting plate 104 can serve as a connection medium between the first pile body component 1 and the upper foundation. The foundation connecting holes 105 facilitate rapid fixing of the two components using bolts or other connectors, simplifying the connection process between the pipe pile and the superstructure. This solves the problems of complex connection and low construction efficiency in existing pipe pile and foundation connections, while also enhancing the stability of the connection. Multiple inclined support plates 106 are welded to the bottom surface of the foundation connecting plate 104. The other ends of the multiple inclined support plates 106 are fixedly connected to the outer surface of the upper pile body 101. 106 can form a triangular support structure between the pile cap connecting plate 104 and the upper pile body 101, distributing the load transmitted by the upper pile cap to the outer surface of the upper pile body 101, avoiding cracking at the connection between the pile cap connecting plate 104 and the upper pile body 101 due to stress concentration, and improving the overall bearing capacity of the first pile body component 1. The top of the upper pile body 101 is provided with a reserved installation hole 107 for connecting external diagonal bracing rods. The reserved installation hole 107 can be used to install external diagonal bracing rods. During the construction stage or use of the pipe pile, the diagonal bracing rods form lateral support for the first pile body component 1, reducing the tilting of the pipe pile in soft soil foundation due to lateral force, improving the stability of the pipe pile under complex geological conditions, and solving the problem of existing pipe piles being prone to tilting in soft soil foundations.

[0034] Reference Figure 1 , Figure 2 and Figure 3 A corrosion-resistant sealing plate 304 is fixedly connected to the bottom surface of the lower prestressed connecting plate 303. A base plate 305 is fixedly connected to the bottom surface of the corrosion-resistant sealing plate 304. Anchor cones 306 are welded evenly distributed to the bottom surface of the base plate 305. The corrosion-resistant sealing plate 304 can form a sealed protection for the bottom anchorage end of the lower prestressed connecting plate 303 and the prestressed steel bar 4, reducing the erosion of groundwater or corrosive media and improving durability. The base plate 305 and the anchor cones 306 can increase the contact area and embedment depth between the second pile body component 3 and the foundation, enhance the pile end anchorage force of the pipe pile, improve the overall bearing capacity, and solve the problem of insufficient pile-soil interaction.

[0035] The implementation principle of this application embodiment is as follows: During construction, the prefabricated first pile body component 1, diameter-changing component 2 and second pile body component 3 are fixedly connected to form an integral pile body. After the prestressed steel bar 4 passes through the three components, its two ends are anchored and tensioned through the upper prestressed connecting plate 103 and the lower prestressed connecting plate 303 to generate prestress. This stress is evenly transmitted to the upper pile body 101, the diameter-changing pile 201 and the lower pile body 301 through the upper annular reinforcing bar 102, the diameter-changing annular reinforcing bar 202 and the lower annular reinforcing bar 302 welded to the outer surface of the prestressed steel bar 4, thereby offsetting the tensile stress borne by the pile body to prevent cracking. When the pipe pile bears the load of the superstructure, the load is transferred to the first pile body component 1 through the pile cap connecting plate 104 and the pile cap connecting hole 105. The inclined support plate 106 disperses part of the load to the outer wall of the upper pile body 101 to avoid local stress concentration. The reserved installation hole 107 can enhance the lateral stability of the upper pile body 101 in soft soil foundation through external inclined bracing. When the load is transferred to the variable diameter component 2 through the upper pile body 101, the diameter of the variable diameter pile 201 gradually changes from top to bottom and the inner hole changes synchronously, so that the stress is smoothly transitioned along the pile body. With the help of the variable diameter annular reinforcing bar 202, the stress is further dispersed. At the same time, the spiral ribs 203 on the outer surface are tightly interlocked with the surrounding soil. Through friction and interlocking, the pile-soil interaction is enhanced to improve the pull-out performance and bearing capacity. The load is ultimately transferred to the second pile component 3. The lower pile 301 is stabilized by the lower ring reinforcing bar 302. The base plate 305 and the anchoring cone 306 increase the contact area and embedment depth between the pile end and the foundation, effectively spreading the load to the foundation to reduce settlement. The anti-corrosion sealing plate 304 protects the lower prestressed connection plate 303 and the bottom anchoring end of the prestressed steel bar 4 from groundwater erosion, ensuring long-term stress stability. Through the synergistic effect of each component, the overall structure achieves a comprehensive effect of uniform stress distribution, increased bearing capacity, enhanced stability and durability.

[0036] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A prestressed variable diameter pipe pile, comprising a first pile body assembly (1), a variable diameter assembly (2), a second pile body assembly (3), and prestressed steel bars (4), characterized in that: The first pile body assembly (1) includes an upper pile body (101), the upper pile body (101) having uniformly distributed upper annular reinforcing ribs (102) inside. The variable diameter assembly (2) includes a variable diameter pile (201) fixedly connected to the bottom end of the upper pile body (101), the variable diameter pile (201) having uniformly distributed variable diameter annular reinforcing ribs (202) inside, and uniformly distributed spiral ribs (203) fixedly connected to the outer surface of the variable diameter pile (201). The second pile body assembly (3) includes a pile body fixedly connected to the bottom end of the variable diameter pile (201). The lower section of the pile body (301) is provided with uniformly distributed lower section annular reinforcing bars (302) inside. The prestressed steel bars (4) pass through the first pile body assembly (1), the variable diameter assembly (2) and the second pile body assembly (3) in sequence. The two ends of the prestressed steel bars (4) are respectively anchored to the top of the first pile body assembly (1) and the bottom of the second pile body assembly (3). Multiple upper section annular reinforcing bars (102), variable diameter annular reinforcing bars (202) and lower section annular reinforcing bars (302) are all welded to the outer surface of the prestressed steel bars (4).

2. The prestressed variable-diameter pipe pile according to claim 1, characterized in that: The top end of the upper section of the pile body (101) is fixedly connected to the upper prestressed connecting plate (103), and the bottom end of the lower section of the pile body (301) is fixedly connected to the lower prestressed connecting plate (303). The two ends of the prestressed steel bar (4) are respectively connected to the upper prestressed connecting plate (103) and the lower prestressed connecting plate (303).

3. The prestressed variable-diameter pipe pile according to claim 2, characterized in that: The upper surface of the upper prestressed connecting plate (103) is fixedly connected to a bearing platform connecting plate (104), and the bearing platform connecting plate (104) is provided with evenly distributed bearing platform connecting holes (105).

4. The prestressed variable-diameter pipe pile according to claim 3, characterized in that: The bottom surface of the pier connecting plate (104) is welded with a plurality of inclined support plates (106), and the other end of the plurality of inclined support plates (106) is fixedly connected to the outer surface of the upper pile body (101).

5. The prestressed variable-diameter pipe pile according to claim 1, characterized in that: The top of the upper section of the pile (101) is provided with a reserved installation hole (107) for connecting the external diagonal brace.

6. The prestressed variable-diameter pipe pile according to claim 2, characterized in that: The bottom surface of the lower prestressed connecting plate (303) is fixedly connected to an anti-corrosion sealing plate (304), and the bottom surface of the anti-corrosion sealing plate (304) is fixedly connected to a chassis (305). The bottom surface of the chassis (305) is welded with uniformly distributed anchoring cones (306).

7. The prestressed variable-diameter pipe pile according to claim 1, characterized in that: The prestressed steel bar (4) includes a vertical section located in the first pile body assembly (1), an inclined section located in the diameter-changing assembly (2) and a vertical section located in the second pile body assembly (3), and the inclination angle of the inclined section is consistent with the diameter-changing angle of the diameter-changing pile (201).

8. The prestressed variable-diameter pipe pile according to claim 1, characterized in that: The upper pile body (101) and the upper ring reinforcing bar (102) are designed with equal diameters. The diameter of the prestressed steel bar (4) gradually increases from top to bottom, and the inner diameter of the prestressed steel bar (4) changes synchronously with the outer diameter.

Images