Prestressed pipe pile with re-pourable concrete and construction process

Abstract

The present disclosure relates to the technical field of concrete pipe pile, and particularly relates to a prestressed pipe pile capable of pouring concrete again, which comprises a steel reinforcement cage, a concrete layer wrapping the steel reinforcement cage, and a plurality of prestressed tendons, and the whole is in a tubular shape. Bottom end plates and top end plates are arranged at two ends of the concrete layer, and the bottom end plates and the top end plates are both made of metal. A plurality of connecting fastening rings are arranged on the circumference of the steel reinforcement cage, and a plurality of pouring pipes are embedded in the concrete layer. The pouring pipes are preferably made of metal, and the pouring pipes are fixed on the steel reinforcement cage through the connecting fastening rings to prevent dislocation when pouring concrete. The pouring pipes comprise a top end inlet and a bottom end outlet, the inlet is led out upward from the top end plate, and the outlet is exposed from the side wall of the concrete layer. After the prestressed pipe pile is sunk into a pile hole, concrete is continuously conveyed into the pouring pipes, and the concrete flows out from the side wall of the pipe pile to fill the gap between the prestressed pipe pile and the pile hole, so as to enhance the strength of the pile foundation.

Description

Technical Field

[0001] This disclosure relates to the field of concrete pipe pile technology, and in particular to a prestressed pipe pile that can be re-cast with concrete and its construction process. Background Technology

[0002] Pre-tensioning is a construction process in which prestressing tendons are tensioned before concrete is poured and temporarily anchored to fixed seats. Then, concrete is poured, and after the concrete has solidified and there is sufficient bond between the prestressing tendons and the concrete, the prestressing tendons are released, allowing them to bond with the concrete and apply prestress to the concrete.

[0003] Currently, during the construction process, it has been found that after the prestressed pipe piles are sunk into the pile pit, there are gaps in the middle or bottom of the pile pit, and there are gaps between the prestressed pipe piles and the pile pit. The gaps between the pile pit and the prestressed pipe piles need to be filled again to improve the safety of the pile foundation. However, the upper end of the installed prestressed pipe piles also prevents the concrete from entering, and the defects in the pile pit cause safety hazards. Summary of the Invention

[0004] Therefore, the present invention provides a prestressed pipe pile that can be re-cast with concrete and a construction process thereof, which solves the problem of gap defects in the existing technology.

[0005] A prestressed concrete pipe pile capable of being recast with concrete includes a reinforcing cage and a concrete layer enclosing the reinforcing cage, and a bottom end plate and a top end plate disposed at both ends of the concrete layer. The reinforcing cage includes a plurality of vertical bars, the ends of which protrude from the bottom end plate and the top end plate, respectively. A plurality of connecting fastening rings are disposed circumferentially on the reinforcing cage, and the plurality of connecting fastening rings are tied to the reinforcing cage, and are arranged at intervals along the length of the vertical bars. A plurality of casting pipes are also embedded in the concrete layer, and are tied to the connecting fastening rings. Each casting pipe includes an inlet and an outlet, the inlet of which passes through the top end plate, and the outlet of which protrudes from the side wall of the concrete layer.

[0006] Specifically, the upper end of the pouring pipe is vertically arranged, the lower end of the pouring pipe is bent towards the side wall of the concrete layer, and the outlet of the pouring pipe is funnel-shaped.

[0007] Specifically, the number of the pouring pipes is set to 4, and the 4 pouring pipes are evenly arranged around the circumference of the reinforcing cage. Several branch pipes are also provided on the side wall of the pouring pipes, and the branch pipes are all inclined downward and facing the side wall of the concrete layer.

[0008] Specifically, the connecting fastening ring includes an inner ring and an outer ring, with several short rods provided between the inner ring and the outer ring, several of the casting pipes connected to the outer ring, and the inner ring tied to the reinforcing cage.

[0009] Specifically, it also includes a number of prestressing tendons, and the outer ring is provided with a number of first grooves with outward openings, which are suitable for accommodating the casting pipe; the outer ring is also provided with a number of second grooves, which are suitable for accommodating the prestressing tendons.

[0010] Specifically, the first groove and the second groove are staggered on the outer ring to form an S-shape.

[0011] Specifically, the casting pipe is also provided with a connecting flange that is threaded to the feed port, and a limit pin is also provided at the feed port, the limit pin passing through the connecting flange and the side wall of the feed port.

[0012] Specifically, a first positioning hole is provided on the side wall of the feed inlet, a second positioning hole is provided on the connecting flange, the limiting pin passes through the first positioning hole and the second positioning hole, and the limiting pin is horizontally positioned and passes through the axis of the feed inlet; the upper end of the cross-section of the limiting pin is conical, and the lower end of the cross-section of the limiting pin is arc-shaped.

[0013] Specifically, the reinforcing cage also includes several steel rings, which are arranged within a circle formed by the surrounding vertical bars.

[0014] This invention also provides a construction process for a re-cast prestressed pipe pile, including the aforementioned re-cast prestressed pipe pile, comprising the following steps: measuring, setting out, and marking the pile pit to determine the location of the gaps within the pile pit; selecting a re-cast prestressed pipe pile of suitable size, wherein the location of the discharge port of the casting pipe in the re-cast prestressed pipe pile corresponds to the location of the gaps within the pile pit; pressing the prestressed pipe pile into the pre-set height marked in the pile pit using static pressure or hammering; preparing cement grout, injecting the cement grout under high pressure into the casting pipe, filling the external gaps of the prestressed pipe pile with the cement grout, continuously injecting cement grout, and continuing to fill the casting pipe after the external gaps of the pipe pile are filled, thus completing the casting operation.

[0015] The technical solution disclosed herein has the following advantages:

[0016] 1. In this scheme, the prestressed concrete pipe pile includes a reinforcing cage, a concrete layer enclosing the reinforcing cage, and several prestressing tendons. Several connecting fastening rings are installed around the circumference of the reinforcing cage. Several pouring pipes are embedded within the concrete layer and fixed to the reinforcing cage by the connecting fastening rings to prevent misalignment during concrete pouring. Each pouring pipe includes an inlet at the top and an outlet at the bottom. The inlet extends upwards from the top plate, and the outlet protrudes from the side wall of the concrete layer. After the prestressed concrete pipe pile is driven into the pile hole, concrete continues to be pumped into the pouring pipe, causing the concrete to flow out from the side wall of the pipe pile. The flowing concrete fills the gap between the prestressed concrete pipe pile and the pile pit, thereby enhancing the strength of the pile foundation.

[0017] 2. In an optional scheme, several branch pipes can also be set on the side wall of the pouring pipe. The branch pipes are all inclined downward and the discharge ports are all set on the side wall of the concrete. The branch pipes are spaced apart along the length of the main pouring pipe to pour concrete at different heights of the prestressed pipe pile at the same time.

[0018] 3. To facilitate the injection of cement slurry, a connecting flange is also installed at the inlet of the pouring pipe. The connecting flange is connected to the inlet by threads. A limit pin is also installed between the connecting flange and the inlet. The limit pin is horizontally set and passes through the side wall of the connecting flange and the inlet. When the cement slurry is injected under high pressure, the connecting flange and the inlet are separated, which restricts the relative rotation between the connecting flange and the inlet and increases the axial abutment force between the connecting flange and the inlet, thereby increasing the connection strength between the connecting flange and the inlet. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the specific embodiments of this disclosure or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is an overall schematic diagram of a re-cast prestressed pipe pile according to an embodiment of the present disclosure;

[0021] Figure 2 This is an internal structural diagram of a re-castable prestressed pipe pile according to an embodiment of the present disclosure.

[0022] Figure 3 This is a schematic diagram of the steel cage structure according to an embodiment of the present disclosure;

[0023] Figure 4 This is a schematic diagram illustrating the fit between the connecting fastening ring and the casting pipe according to an embodiment of this disclosure;

[0024] Figure 5This is a schematic diagram of the connection between the connecting flange and the casting pipe according to an embodiment of the present disclosure;

[0025] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0026] Explanation of reference numerals in the attached drawings: 1. Reinforcing cage; 2. Concrete layer; 3. Connecting fastening ring; 4. Casting pipe; 5. Prestressed tendon; 11. Vertical bar; 12. Steel ring; 21. Top plate; 22. Bottom plate; 31. Inner ring; 32. Outer ring; 321. First groove; 322. Second groove; 33. Short rod; 41. Feed inlet; 411. First positioning hole; 412. External thread; 42. Discharge outlet; 43. Branch pipe; 6. Connecting flange; 61. Second positioning hole; 62. Internal thread; 7. Limiting pin. Detailed Implementation

[0027] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0028] It should be understood that the steps described in the method embodiments of this disclosure may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of this disclosure is not limited in this respect.

[0029] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc., used in this disclosure are only used to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0030] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0031] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0032] This invention discloses a prestressed pipe pile that can be re-cast with concrete, referring to... Figures 1 to 4 The structure comprises a reinforcing cage 1, a concrete layer 2 enclosing the reinforcing cage 1, and several prestressed tendons 5, forming a tubular shape. Bottom end plates 22 and top end plates 21 are provided at both ends of the concrete layer 2, both made of metal. Several connecting fastening rings 3 are provided around the circumference of the reinforcing cage 1. Several pouring pipes 4 are also embedded within the concrete layer 2. The pouring pipes 4 are preferably made of metal and are fixed to the reinforcing cage 1 by the connecting fastening rings 3 to prevent misalignment during concrete pouring. Each pouring pipe 4 includes an inlet 41 at the top and an outlet 42 at the bottom. The inlet 41 extends upwards from the top end plate 21, and the outlet 42 protrudes from the side wall of the concrete layer 2. In this design, the height of the outlet 42 along the side wall of the pipe pile is not limited and can be set according to actual needs. After the prestressed pipe pile is driven into the pile hole, concrete is continuously pumped into the pouring pipe 4, causing the concrete to flow out from the side wall of the pipe pile. The outflowing concrete fills the gap between the prestressed pipe pile and the pile pit, thereby enhancing the strength of the pile foundation.

[0033] The reinforcing cage 1 includes several vertical bars 11 and several steel rings 12. The two ends of the vertical bars 11 pass through the bottom end plate 22 and the top end plate 21 respectively. The several vertical bars 11 are arranged in a circle. The several steel rings 12 are arranged along the length of the vertical bars 11, and the several steel rings 12 are all located inside the circle surrounded by the several vertical bars 11. The steel rings 12 are welded to the vertical bars 11.

[0034] Several connecting fastening rings 3 are fitted onto the reinforcing cage 1 and evenly distributed along the length of the vertical reinforcing bars 11. The connecting fastening rings 3 are tied to the reinforcing cage 1 with wire. Specifically, the connecting fastening rings 3 include an outer ring 32 and an inner ring 31. Several short rods 33 are provided between the outer ring 32 and the inner ring 31, and the outer ring 32 and the inner ring 31 are connected and fixed by the short rods 33. The inner ring 31 fits against several vertical reinforcing bars 11 and is tied to the reinforcing cage 1. The outer ring 32 includes a first groove 321 and a second groove 322. The first groove 321 and the second groove 322 are used to fix the casting pipe 4 and the prestressing tendon 5, respectively. The first groove 321 is set to open outward and is arc-shaped to adapt to the casting pipe 4. The casting pipe 4 is tied to the first groove 321. The second groove 322 is set to open inward and is also arc-shaped. The prestressing tendon 5 is tied to the second groove 322.

[0035] The first groove 321 and the second groove 322 are staggered on the outer ring 32 and form an S-shape. The short rod 33 is connected to the outer ring 32 at the position closest to the inner ring 31. The two short rods 33, the second groove 322 and the inner ring 31 are arranged in a circle. The prestressing tendon 5 is located inside the circle, which can prevent the position of the prestressing tendon 5 from shifting.

[0036] The number of casting pipes 4 is set to 4, and the 4 casting pipes 4 are evenly arranged around the circumference of the reinforcing cage 1. During construction, concrete can be driven into the casting pipes 4 simultaneously, so that the outer wall of the prestressed pipe pile is covered with concrete, thus balancing the force on the prestressed pipe pile. The number of casting pipes 4 can also be 6 or 8, but it is best to arrange them evenly around the circumference of the casting pipes 4.

[0037] The upper end of the casting pipe 4 is vertically positioned, while the lower end of the casting pipe 4 bends downwards. The outlet 42 of the casting pipe 4 extends to the side wall of the concrete layer 2. The outlet 42 of the casting pipe 4 is funnel-shaped to facilitate concrete discharge and flow. After the circumferential outer wall of the prestressed concrete pipe pile is filled with concrete, more concrete is added until the casting pipe 4 is completely filled. When fabricating the prestressed concrete pipe pile, rubber plugs can be inserted into the inlet 41 and outlet 42 of the casting pipe 4 to prevent concrete from entering the casting pipe 4 and to facilitate subsequent refilling of concrete.

[0038] In an optional scheme, several branch pipes 43 can also be installed on the side wall of the pouring pipe 4. The branch pipes 43 are all inclined downward and the discharge ports 42 are all located on the side wall of the concrete. The branch pipes 43 are spaced apart along the length of the main pouring pipe 4, and are used to pour concrete at different heights of the prestressed pipe pile at the same time.

[0039] Reference Figure 5 and Figure 6To facilitate the injection of cement grout, a connecting flange 6 is provided at the inlet 41 of the pouring pipe 4. An external thread 412 is provided on the outer wall of the inlet 41, and an internal thread 62, which mates with the external thread 412, is provided on the inner wall of the connecting flange 6. The connecting flange 6 has holes for bolt connection to the component used for injecting cement grout. A limit pin 7 is also provided between the connecting flange 6 and the inlet 41. The limit pin 7 is horizontally positioned, passing through the side walls of both the connecting flange 6 and the inlet 41. During high-pressure injection of cement grout, the connecting flange 6 is disengaged from the inlet 41, increasing the connection strength between them. Specifically, a pair of first positioning holes 411 are provided on the side wall of the feed inlet 41. The pair of first positioning holes 411 are symmetrically arranged about the axis of the feed inlet 41 and are located at the external thread 412. A pair of second positioning holes 61 are provided on the connecting flange 6. The pair of second positioning holes 61 are symmetrically arranged about the axis of the connecting flange 6 and are located at the internal thread 62. When the connecting flange 6 is threaded onto the feed inlet 41, the limiting pin 7 passes through the first positioning holes 411 and the second positioning holes 61, restricting the relative rotation between the connecting flange 6 and the feed inlet 41 and increasing the axial abutment force between the connecting flange 6 and the feed inlet 41, thus tightly connecting the connecting flange 6 and the feed inlet 41.

[0040] The limiting pin 7 is cylindrical and horizontally passes through the connecting flange 6 and the inlet 41. The limiting pin 7 also passes through the axis of the inlet 41, effectively dividing the inlet 41 in two. When the limiting pin 7 is placed horizontally, the upper end of its cross-section is conical, and the lower end is arc-shaped, with a smooth transition between the conical and arc-shaped sections. The first positioning hole 411 and the second positioning hole 61 are both adapted to the shape of the limiting pin 7. The conical shape can cut through the gravel in the cement slurry and block larger stones, preventing them from clogging the pouring pipe 4 and hindering the pouring operation. If stones clog the inlet 41, the connecting flange 6 can be disassembled to remove the stones, and construction can continue. The arc-shaped lower end abuts against the first positioning hole 411 and the second positioning hole 61, allowing the cement slurry to flow smoothly into the pouring pipe 4.

[0041] This prestressed pipe pile can achieve secondary casting of the pipe pile in the pile pit by setting the casting pipe 4 inside the pile body, thus solving the problem of gaps between the existing pit and the prestressed pipe pile.

[0042] This invention also provides a construction process for re-cast prestressed pipe piles, comprising the following steps:

[0043] The pile pit is measured, laid out, and marked to determine the location of the gap inside the pile pit; a prestressed pipe pile of appropriate size that can be recast is selected, and the position of the discharge port 42 of the casting pipe 4 in the recast prestressed pipe pile corresponds to the position of the gap inside the pile pit.

[0044] The prestressed pipe piles are pressed into the pre-set height marked in the pile pit by static pressure or hammer driving. Cement grout is prepared and injected into the pouring pipe 4 under high pressure. The cement grout fills the external gaps of the prestressed pipe pile. Cement grout is continuously injected. After the external gaps of the pipe pile are filled, the pouring pipe 4 is filled to complete the pouring operation.

[0045] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom remain within the scope of this disclosure.

Claims

1. A prestressed concrete pipe pile that can be recast with concrete, comprising a reinforcing cage (1) and a concrete layer (2) enclosing the reinforcing cage (1), characterized in that, It also includes a bottom plate (22) and a top plate (21) set at both ends of the concrete layer (2). The steel cage (1) includes a number of vertical bars (11), and the two ends of the number of vertical bars (11) pass through the bottom plate (22) and the top plate (21) respectively. The steel cage (1) is provided with a plurality of connecting fastening rings (3) in the circumferential direction. The plurality of connecting fastening rings (3) are tied to the steel cage (1), and the plurality of connecting fastening rings (3) are arranged at intervals along the length direction of the vertical bar (11). Several pouring pipes (4) are also embedded in the concrete layer (2). Several pouring pipes (4) are tied to the connecting fastening ring (3). The pouring pipe (4) includes an inlet (41) and an outlet (42). The inlet (41) of the pouring pipe (4) passes through the top plate (21), and the outlet (42) of the pouring pipe (4) is exposed from the side wall of the concrete layer (2). The upper end of the pouring pipe (4) is vertically set, the lower end of the pouring pipe (4) is bent toward the side wall of the concrete layer (2), and the outlet (42) of the pouring pipe (4) is funnel-shaped. The number of the casting pipes (4) is set to 4. The 4 casting pipes (4) are evenly arranged in the circumference of the steel cage (1). Several branch pipes (43) are also provided on the side wall of the casting pipes (4). The several branch pipes (43) are all inclined downward and set towards the side wall of the concrete layer (2). The connecting fastening ring (3) includes an inner ring (31) and an outer ring (32). A number of short rods (33) are provided between the inner ring (31) and the outer ring (32). A number of the casting pipes (4) are connected to the outer ring (32). The inner ring (31) is tied to the steel cage (1). If the prestressing tendon (5) is interfered with, the outer ring (32) is provided with several first grooves (321) with openings facing outwards, which are suitable for accommodating the casting pipe (4); the outer ring (32) is also provided with several second grooves (322), which are suitable for accommodating the prestressing tendon (5); The first groove (321) and the second groove (322) are staggered on the outer ring (32) to form an S-shape.

2. The prestressed pipe pile capable of being recast with concrete according to claim 1, characterized in that, The casting pipe (4) is also provided with a connecting flange (6) that is threadedly connected to the feed inlet (41). A limiting pin (7) is also provided at the feed inlet (41). The limiting pin (7) passes through the connecting flange (6) and the side wall of the feed inlet (41).

3. The prestressed pipe pile capable of being recast with concrete according to claim 2, characterized in that, The feed inlet (41) has a first positioning hole (411) on its side wall, and the connecting flange (6) has a second positioning hole (61). The limiting pin (7) passes through the first positioning hole (411) and the second positioning hole (61), and the limiting pin (7) is horizontally positioned. The limiting pin (7) passes through the axis of the feed inlet (41). The upper end of the cross-section of the limiting pin (7) is tapered, and the lower end of the cross-section of the limiting pin (7) is arc-shaped.

4. The prestressed pipe pile capable of being recast with concrete according to claim 1, characterized in that, The steel cage (1) also includes several steel rings (12), which are arranged within a circle formed by the surrounding of several vertical bars (11).

5. A construction process for re-cast prestressed pipe piles, comprising the re-cast prestressed pipe piles as described in any one of claims 1-4, characterized in that, Includes the following steps: The pile pit is measured, laid out, and marked to determine the location of the gap in the pile pit; a prestressed pipe pile of appropriate size that can be recast is selected, and the location of the discharge port (42) of the casting pipe (4) in the recast prestressed pipe pile corresponds to the location of the gap in the pile pit. The prestressed pipe piles are pressed into the pre-set height marked in the pile pit by static pressure or hammering. Cement grout is prepared and injected into the pouring pipe (4) under high pressure. The cement grout fills the external gaps of the prestressed pipe pile. Cement grout is continuously injected. After the external gaps of the pipe pile are filled, the pouring pipe (4) is filled to complete the pouring operation.

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