Connecting structure of PHC pipe pile and prefabricated bearing platform and connecting method of connecting structure

Abstract

The invention relates to the technical field of building structures, in particular to a connecting structure of a PHC pipe pile and a prefabricated bearing platform and a connecting method thereof.The connecting structure comprises the prefabricated bearing platform, the PHC pipe pile and a reinforcement cage; a plurality of pile position holes are reserved in the prefabricated bearing platform, and the prefabricated bearing platform is arranged on the upper portion of the PHC pipe pile in a sleeving mode through the pile position holes; a steel reinforcement cage is arranged in the pile position hole, the lower end of the steel reinforcement cage is fixedly connected with a supporting plate, fixing ribs are fixedly arranged on the outer side of the lower portion of the steel reinforcement cage, and the lower portion of the steel reinforcement cage is arranged in the PHC pipe pile in a suspended mode through the fixing ribs; a plurality of inner grooves are formed in the inner side wall of the pile position hole, and core filling concrete is poured in the pile position hole and the area, located on the upper portion of the supporting plate, of the PHC pipe pile. By the adoption of the connecting structure, the roughness degree of the inner wall of the pipe pile is increased, the bonding force between the pipe pile and the bearing platform is higher, the pulling-resistant and bending-resistant bearing capacity of the pipe pile is improved, and the stability and durability of the connecting structure are enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of building structures, and specifically refers to a connection structure of a PHC pipe pile and a prefabricated cap and a connection method thereof. Background Art

[0002] PHC pipe pile, full name is prestressed high-strength concrete pipe pile, is a hollow cylindrical concrete precast component. PHC pipe piles are divided into type A, type AB, type B, and type C according to the effective precompression stress value of the pile body concrete, and are divided into prestressed concrete pipe piles (code PC) and prestressed high-strength concrete pipe piles (code PHC) according to the concrete strength grade. PHC pipe piles are widely used in high-rise buildings, industrial and civil buildings, transportation infrastructure, water conservancy projects and other fields due to their high bearing capacity, wide range of applications, reliable pile quality and economy.

[0003] In the existing connection structure of PHC pipe piles and prefabricated caps, when installing the pipe piles and the caps, the connection between the pipe piles and the caps is mainly provided with the bonding force between the pipe piles and the caps by the concrete core filling method. The greater the friction force of the inner wall of the pipe piles, the stronger the bonding force. The inner wall of the pipe piles is usually relatively smooth, and the pull-out bearing capacity is low after filling with concrete. Under some geological conditions, the stability and durability of the connection are not ideal. Summary of the invention

[0004] Based on the above technical problems, the purpose of the present invention is to provide a connection structure and a connection method of a PHC pipe pile and a prefabricated cap, so as to solve the problems mentioned in the above background technology that the inner wall of the conventional pipe pile is relatively smooth, and the tensile and bending bearing capacity is low after filling with concrete, and the stability and durability of the connection are not ideal under some geological conditions.

[0005] In order to achieve the above functions, the technical solution adopted by the present invention is as follows:

[0006] A connection structure of a PHC pipe pile and a prefabricated cap, comprising a prefabricated cap, a PHC pipe pile and a steel cage;

[0007] A plurality of pile holes are reserved inside the prefabricated cap, and the prefabricated cap is sleeved on the upper part of the PHC pile through the pile holes;

[0008] A steel cage is arranged in the pile hole, a support plate is fixedly connected to the lower end of the steel cage, a fixing rib is fixedly arranged on the outer side of the lower part of the steel cage, and the lower part of the steel cage is suspended in the PHC pile through the fixing rib;

[0009] The inner side wall of the pile hole is provided with a plurality of inner grooves, and the inside of the pile hole and the area where the PHC pile is located on the upper part of the support plate are both poured with core-filling concrete.

[0010] In some embodiments, the upper inner wall surface of the PHC pile is roughened.

[0011] In some of the embodiments, the prefabricated foundation is provided with an external groove at the top of each pile hole, an end / anchor plate is arranged in the external groove, and the end / anchor plate is connected to the vertical steel bars of the steel cage by perforation plug welding.

[0012] In some of the embodiments, the support plate is connected to the vertical steel bars of the steel cage by piercing plug welding.

[0013] In some of the embodiments, a cap stress-bearing steel bar is disposed at the bottom of the pile hole, and the cap stress-bearing steel bar is disposed at the outer edge of the pile hole.

[0014] In some of the embodiments, cement mortar is provided between the core-filling concrete and the side wall of the pile hole.

[0015] In some of the embodiments, the inner groove is square.

[0016] In addition, the present invention also discloses a method for connecting a PHC pile and a prefabricated cap, comprising the following steps:

[0017] A prefabricated cap having a plurality of pile holes reserved therein is provided, and the inner side walls of the pile holes are provided with a plurality of internal grooves;

[0018] The prefabricated cap is sleeved on the upper part of the PHC pile through the pile hole;

[0019] A steel cage structure is provided, wherein the steel cage structure comprises a steel cage, a support plate is welded at the bottom of the steel cage, and a fixing rib is fixed at the outer edge of the lower part;

[0020] Put the steel cage structure into the pile hole from the top of the pile hole, and the fixing ribs are clamped on the top of the PHC pile, and the support plate is located in the PHC pile;

[0021] Using the support plate as a bottom form, pouring core-filling concrete into the pile hole and the PHC pile;

[0022] Weld end / anchor plates to the top of the reinforcement cage.

[0023] In some embodiments, the inner wall surface of the upper end of the PHC pile is roughened.

[0024] In some of the embodiments, the prefabricated foundation is provided with an external groove at the top of each pile hole, the end / anchor plate is arranged in the external groove, and the end / anchor plate is connected to the vertical steel bars of the steel cage by perforation plug welding, and the support plate is connected to the vertical steel bars of the steel cage by perforation plug welding.

[0025] Compared with the prior art, the above invention has at least one of the following advantages or beneficial effects:

[0026] The connection structure and connection method of the PHC pipe pile and the prefabricated cap disclosed in the present invention can increase the roughness of the inner wall of the pipe pile, make the bonding force between the pipe pile and the cap stronger, improve the pull-out and bending bearing capacity of the pipe pile, enhance the stability and durability of the connection structure, be applicable to various geological conditions and engineering environments, improve construction efficiency, and shorten the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0028] Figure 1 It is a schematic diagram of the overall structure of the connection structure between the PHC pile and the prefabricated cap in an embodiment of the present invention;

[0029] Figure 2 It is a schematic cross-sectional structure diagram of the connection structure of the PHC pile and the prefabricated cap in an embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of the bottom structure of the prefabricated foundation in an embodiment of the present invention.

[0031] Figure numerals: 1. Precast cap; 2. Cap stress reinforcement; 3. Pile hole; 4. PHC pipe pile; 5. Steel cage; 6. Internal groove; 7. Core filling concrete; 8. Perforation plug welding; 9. End / anchor plate; 10. Support plate; 11. Rough surface; 12 Fixing reinforcement. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] Embodiment 1:

[0034] See also Figures 1 to 3The present embodiment discloses a connection structure of a PHC pile and a prefabricated cap, comprising a prefabricated cap 1, a PHC pile 4 and a steel cage 5; four pile holes 3 are reserved inside the prefabricated cap 1, and the prefabricated cap 1 is sleeved on the upper part of the PHC pile 4 through the pile holes 3 (the inner diameter of the pile hole 3 is adapted to the upper outer diameter of the PHC pile 4); a steel cage 5 is arranged in the pile hole 3, and a support plate 10 is fixedly connected to the lower end of the steel cage 5, and the support plate 10 is The diameter is substantially the same as the inner diameter of the PHC pile 4. The lower outer side of the steel cage 5 is fixedly provided with fixing ribs (the fixing ribs are arranged horizontally), and the lower part of the steel cage 5 is suspended in the PHC pile 4 through the fixing ribs (i.e., the outer diameter of the steel cage 5 is less than or equal to the outer diameter of the PHC pile 4). The inner side wall of the pile hole 3 is provided with a plurality of square inner grooves 6, and the area in the pile hole 3 and the area where the PHC pile 4 is located on the upper part of the support plate 10 are poured with core-filling concrete 7. The upper inner wall surface of the PHC pile 4 is a rough surface 11. Specifically, the upper inner wall surface of the PHC pile 4 located above the support plate 10 is chiseled into a rough surface 11. The connection structure of the PHC pile and the prefabricated cap is adopted to increase the roughness of the inner wall of the pile, make the bonding force between the pile and the cap stronger, improve the pull-out and bending bearing capacity of the pile, enhance the stability and durability of the connection structure, and is suitable for a variety of geological conditions and engineering environments, improve construction efficiency, and shorten the construction period.

[0035] Specifically, the prefabricated cap 1 is provided with an external groove at the top of each pile hole 3, and an end / anchor plate 9 is arranged in the external groove (the external groove is used to place the end / anchor plate 9), and the end / anchor plate 9 is connected to the vertical steel bars of the steel cage 5 by punching plug welding 8, and the support plate 10 is also connected to the vertical steel bars of the steel cage 5 by punching plug welding 8. The cap bearing steel bars are arranged at the bottom of the pile hole 3, and the cap bearing steel bars are arranged at the outer edge of the pile hole 3, that is, when the pile hole 3 is formed, the cap bearing steel bars are pushed to the outside to form the pile hole 3. High-grade cement mortar is arranged between the core filling concrete 7 and the side wall of the pile hole 3. Specifically, the floating slurry on the surface of the old concrete is removed, and high-grade cement mortar is applied to the interface between the new and old concrete before pouring concrete.

[0036] Embodiment 2:

[0037] The present invention also discloses a method for connecting a PHC pipe pile and a prefabricated cap. Specifically, the method comprises the following steps:

[0038] Step S1, providing a prefabricated cap with four pile holes reserved therein, wherein the inner side walls of the pile holes are provided with a plurality of inner grooves, and the prefabricated cap is provided with an outer groove at the top of each pile hole.

[0039] Specifically, when forming the pile hole, the bearing steel bars of the prefabricated cap are pushed outward to facilitate the formation of the pile hole.

[0040] Step S2, the prefabricated cap is sleeved on the upper part of the PHC pipe pile through the pile hole, and the inner wall surface of the upper end of the PHC pipe pile is chiseled into a rough surface.

[0041] Step S3, providing a steel cage structure, the steel cage structure includes a steel cage, and a support plate is welded at the bottom of the steel cage, and a fixing rib is fixed on the outer edge of the lower part.

[0042] Step S4, placing the steel cage structure into the pile hole from the top of the pile hole, and the fixing ribs are clamped on the top of the PHC pile, and the support plate is located in the PHC pile.

[0043] Step S5, using the support plate as a bottom form, pouring core-filling concrete into the pile hole and the PHC pile.

[0044] Step S6, welding the end / anchor plate to the top of the steel cage.

[0045] Specifically, the end / anchor plate is arranged in the external groove, and the end / anchor plate is connected to the vertical steel bars of the steel cage by piercing plug welding, and the support plate is connected to the vertical steel bars of the steel cage by piercing plug welding.

[0046] After the construction of the PHC pipe pile is completed, the reserved pile position hole of the prefabricated cap is aligned with the PHC pipe pile for installation, the steel cage is fixed to the top of the PHC pipe pile by fixing ribs, the core-filling concrete is poured after the steel cage is fixed inside the pile position hole, the inner groove of the prefabricated cap is fixed by the core-filling concrete, the top of the steel cage is fixed to the end (anchor) plate, and the bottom is fixed to the supporting plate, the inner wall of the connection part between the top of the PHC pile pipe pile and the prefabricated cap is chiseled into a rough surface, the floating slurry on the surface of the old concrete is removed, and high-grade cement mortar is applied to the joint surface of the new and old concrete before pouring concrete, so as to increase the roughness of the inner wall of the pipe pile, make the bonding force between the pipe pile and the cap stronger, improve the pull-out and bending bearing capacity of the pipe pile, enhance the stability and durability of the connection structure, be suitable for various geological conditions and engineering environments, improve the construction efficiency, and shorten the construction period.

[0047] It is not difficult to find that this embodiment is a method embodiment corresponding to the embodiment of the connection structure of the PHC pipe pile and the prefabricated cap in the above-mentioned embodiment 1, and this embodiment can be implemented in conjunction with the embodiment of the connection structure of the PHC pipe pile and the prefabricated cap in the above-mentioned embodiment 1. The relevant technical details mentioned in the embodiment of the connection structure of the PHC pipe pile and the prefabricated cap in the above-mentioned embodiment are still valid in this embodiment, and in order to reduce repetition, they are not repeated here. Accordingly, the relevant technical details mentioned in this embodiment can also be applied in the embodiment of the connection structure of the PHC pipe pile and the prefabricated cap in the above-mentioned embodiment.

[0048] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0051] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A connection structure between a PHC pile and a prefabricated cap, characterized in that: Including precast caps, PHC piles and steel cages; A plurality of pile holes are reserved inside the prefabricated cap, and the prefabricated cap is sleeved on the upper part of the PHC pile through the pile holes; A steel cage is arranged in the pile hole, a support plate is fixedly connected to the lower end of the steel cage, a fixing rib is fixedly arranged on the outer side of the lower part of the steel cage, and the lower part of the steel cage is suspended in the PHC pile through the fixing rib; The inner side wall of the pile hole is provided with a plurality of inner grooves, and the inside of the pile hole and the area where the PHC pile is located on the upper part of the support plate are both poured with core-filling concrete.

2. The connection structure of the PHC pile and the prefabricated cap according to claim 1 is characterized in that: The upper inner wall surface of the PHC pipe pile is rough.

3. The connection structure of the PHC pile and the prefabricated cap according to claim 1 is characterized in that: The prefabricated cap is provided with an external groove at the top of each pile hole, an end / anchor plate is arranged in the external groove, and the end / anchor plate is connected to the vertical steel bars of the steel cage by piercing plug welding.

4. The connection structure of the PHC pile and the prefabricated cap according to claim 1 is characterized in that: The support plate is connected to the vertical steel bars of the steel cage by piercing plug welding.

5. The connection structure of the PHC pile and the prefabricated cap according to claim 1 is characterized in that: A cap bearing steel bar is arranged at the bottom of the pile hole, and the cap bearing steel bar is arranged at the outer edge of the pile hole.

6. The connection structure of the PHC pile and the prefabricated cap according to claim 1, characterized in that: Cement mortar is arranged between the core-filling concrete and the side wall of the pile hole.

7. The connection structure of the PHC pile and the prefabricated cap according to claim 1 is characterized in that: The inner groove is square.

8. A method for connecting a PHC pile and a prefabricated cap, characterized in that: The steps include: A prefabricated cap having a plurality of pile holes reserved therein is provided, and the inner side walls of the pile holes are provided with a plurality of internal grooves; The prefabricated cap is sleeved on the upper part of the PHC pile through the pile hole; A steel cage structure is provided, wherein the steel cage structure comprises a steel cage, a support plate is welded at the bottom of the steel cage, and a fixing rib is fixed at the outer edge of the lower part; Put the steel cage structure into the pile hole from the top of the pile hole, and the fixing ribs are clamped on the top of the PHC pile, and the support plate is located in the PHC pile; Using the support plate as a bottom form, pouring core-filling concrete into the pile hole and the PHC pile; Weld end / anchor plates to the top of the reinforcement cage.

9. The method for connecting a PHC pile and a prefabricated cap according to claim 8, characterized in that: The inner wall surface of the upper end of the PHC pipe pile is rough.

10. The method for connecting a PHC pile and a prefabricated cap according to claim 8, characterized in that: The prefabricated foundation is provided with an external groove at the top of each pile hole, the end / anchor plate is arranged in the external groove, and the end / anchor plate is connected to the vertical steel bars of the steel cage by perforation plug welding, and the support plate is connected to the vertical steel bars of the steel cage by perforation plug welding.

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