Prefabricated pipe pile construction method

Abstract

The invention discloses a prefabricated pipe pile construction method. The method comprises the steps that S1, a prefabricated pipe pile is arranged in a foundation of a preset area; s2, after construction of the prefabricated pipe pile is completed, a reinforcement cage is arranged in a cavity of the prefabricated pipe pile; a cavity of the prefabricated pipe pile is internally provided with a baffle for separating the reinforcement cage from the cavity of the prefabricated pipe pile. S3, the reinforcement cage extends into a preset depth in a cavity of the prefabricated pipe pile; s4, concrete is poured into the cavity of the prefabricated pipe pile; the baffle plates are used for blocking poured concrete in the cavity of the prefabricated pipe pile; s5, after pouring is completed, an anchoring assembly is arranged at the top of the prefabricated pipe pile; s6, after raft reinforcing steel bars are bound, concrete is poured; the reinforcement form and the core grouting length can be optimized, one-time dense grouting of pile core concrete is achieved on the premise that the pulling strength is ensured, and the construction efficiency and the quality reliability are improved.

Description

Technical Field

[0001] The invention relates to the field of prefabricated pipe pile construction, and in particular to a prefabricated pipe pile construction method. Background Art

[0002] In the existing technology, when the silty soil is thick and the groundwater level is high, the pull-out pipe piles need to bear a large anti-buoyancy force. A steel cage needs to be placed in the core part of the pipe pile and concrete needs to be poured to meet the pull-out requirements. Due to the large anti-buoyancy force, the core part of the pipe pile is designed to have more steel bars and the core pouring depth is often greater.

[0003] This method has the following problems:

[0004] 1) The core diameter is large, the number is large, the steel bars are installed densely, the material is wasted, and the installation is troublesome;

[0005] 2) The spacing between steel bars is small and the length of the concrete core is long, which results in the inability to lower the vibrating rod when pouring the concrete core. The pouring is not dense, the quality risk is high, and the cost of using self-compacting concrete is high.

[0006] Therefore, in order to solve the above problems, a prefabricated pipe pile construction method is needed, which can optimize the reinforcement form and the core length, and achieve one-time dense pouring of the pile core concrete while ensuring the pull-out strength, thereby improving construction efficiency and quality reliability. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to overcome the defects in the prior art and provide a prefabricated pipe pile construction method that can optimize the reinforcement form and core pouring length, and achieve one-time dense pouring of pile core concrete while ensuring pull-out strength, thereby improving construction efficiency and quality reliability.

[0008] The prefabricated pipe pile construction method of the present invention comprises the following construction steps:

[0009] S1. Set prefabricated pipe piles in the foundation of the preset area;

[0010] S2. After the construction of the prefabricated piles is completed, a steel cage is provided in the chamber of the prefabricated piles; the chamber of the prefabricated piles has a baffle that blocks the steel cage and the prefabricated pile chamber;

[0011] S3. The steel cage is extended to a preset depth within the prefabricated pile chamber;

[0012] S4. Pour concrete into the cavity of the precast pile; the baffle forms a barrier to pour concrete into the cavity of the precast pile;

[0013] S5. After pouring is completed, an anchor assembly is set on top of the prefabricated pile;

[0014] S6. After tying the raft slab reinforcement, pour concrete.

[0015] Furthermore, the method further includes step S3a. arranging a hopper at the top of the prefabricated pipe pile, wherein the hopper has a discharge port connected to the cavity of the prefabricated pipe pile; and in step S4, pouring concrete into the cavity of the prefabricated pipe pile through the hopper.

[0016] Furthermore, step S3a also includes setting a steel cage positioning hoop at the top of the prefabricated pipe pile, and the steel cage positioning hoop is used to fix each pile main reinforcement of the steel cage at a corresponding preset position.

[0017] Furthermore, the steel cage positioning hoop includes a support inner ring and a plurality of limit forks arranged circumferentially of the support inner ring, the limit fork includes a first fork arm and a second fork arm, the first fork arm and the second fork arm are arranged parallel to the support inner ring, and a limit groove open to the outside is formed between the first fork arm and the second fork arm and the support inner ring, and the number of the limit forks is consistent with the number of pile main bars in the steel cage; when in use, the limit forks limit the pile main bars in a one-to-one correspondence, and each pile main bar is located at the bottom of the corresponding limit groove.

[0018] Furthermore, the hopper includes a base with a material discharge opening and a hopper body connected to the base, and the hopper body has a slope toward the material discharge opening;

[0019] The bottom support of the hopper is arranged on the top surface of the prefabricated pipe pile, and the drop-out port is sleeved on the portion of the steel cage extending out of the prefabricated pipe pile and communicated with the cavity of the prefabricated pipe pile.

[0020] Furthermore, the reinforcement cage positioning hoop includes a U-shaped bolt, a nut adapted to the U-shaped bolt, and a limiting portion for installing the U-shaped bolt, wherein the limiting portion is arranged on the bottom support of the hopper; when in use, the U-shaped bolt sets the main reinforcement of the reinforcement cage in the groove of the U-shaped bolt, and the U-shaped bolt is assembled to the limiting portion through the nut;

[0021] The number of the steel cage positioning hoops is the same as the number of pile main bars in the steel cage; so that when in use, the steel cage positioning hoops limit the pile main bars in a one-to-one correspondence, and each pile main bar is limited in the groove of the corresponding U-shaped bolt.

[0022] Furthermore, the pouring depth of concrete in the prefabricated pipe pile cavity is not less than 45% of the depth of the prefabricated pipe pile cavity.

[0023] Furthermore, the anchoring assembly includes a plurality of anchoring plates arranged around the top of the prefabricated pipe pile, and the anchoring assembly also includes anchoring bars corresponding to the number of anchoring plates, and the anchoring bars are connected to the anchoring plates in a one-to-one correspondence.

[0024] Furthermore, the anchor bar includes a vertical section pointing vertically upward and a bent section at a set angle to the vertical section. After the anchor bar is set on the prefabricated pipe pile through the anchor plate, the top of the bent section faces outward.

[0025] Furthermore, the anchor plate is vertically fixed to the top surface of the prefabricated pipe pile, and the angle between the bent section and the vertical section is not less than 150°.

[0026] Furthermore, the baffle is welded to the bottom of the steel cage before the steel cage is constructed.

[0027] Furthermore, after pouring is completed and the concrete has initially set, the steel cage positioning hoop is removed.

[0028] The beneficial effects of the present invention are as follows: a prefabricated pipe pile construction method disclosed by the present invention realizes one-time casting and forming of the prefabricated pipe pile by shortening the embedded depth of the steel cage, thereby improving the density of the pipe pile core; and the use of the anchoring assembly can ensure the overall pull-out resistance and construction quality, and is suitable for construction environments with narrow sites and tight construction schedules. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0030] Figure 1 This is a schematic structural diagram of the sealing plate of the present invention;

[0031] Figure 2 This is a schematic structural diagram of a steel cage positioning hoop of the present invention;

[0032] Figure 3 It is a structural schematic diagram of the hopper of the present invention;

[0033] Figure 4 For the present invention Figure 3 Schematic diagram of the top view structure;

[0034] Figure 5 It is a side structural schematic diagram of the hopper of the present invention;

[0035] Figure 6 It is a structural schematic diagram of the anchoring assembly of the present invention;

[0036] Figure 7 It is a structural schematic diagram of the anchoring assembly of the present invention;

[0037] Figure 8 It is a structural schematic diagram of the anchoring assembly of the present invention;

[0038] Figure 9 This is a schematic structural diagram of a second structure of only a steel cage positioning hoop according to the present invention;

[0039] Figure 10 This is a schematic structural diagram of a second structure of only a steel cage positioning hoop according to the present invention;

[0040] Figure 11 This is a schematic structural diagram of a third structure of only a steel cage positioning hoop according to the present invention;

[0041] Figure 12 This is a schematic structural diagram of the third structure of the present invention, which only has a steel cage positioning hoop. DETAILED DESCRIPTION

[0042] Figure 1 This is a structural diagram of the present invention. As shown in the figure, the construction method of the prefabricated pipe pile 1 in this embodiment includes the following construction steps:

[0043] S1. Determine the length and location of the prefabricated pipe pile 1; this includes conducting a geological survey, obtaining soil parameters, investigating the groundwater level, and designing the pile length and core grouting depth based on the characteristics of the silty soil layer and relevant experience; this is prior art and will not be further described here.

[0044] S2. Pretreat the foundation of the area where the prefabricated pipe piles 1 are set; if there are miscellaneous fills such as ponds and farmlands on the surface, the surface needs to be excavated and replaced to ensure that the static pressure installation machine can move during construction. Steel plates can be laid or hardened in areas with deeper soft soil layers. This is existing technology and will not be described in detail here.

[0045] S3. A sealing plate 2 is provided at the top of the prefabricated pipe pile 1 to seal the top opening of the prefabricated pipe pile 1. The sealing plate 2 is fixed to the prefabricated pipe pile 1 by a stopper 3;

[0046] Furthermore, the blocking plate 2 is a plate having an outer diameter larger than the top of the prefabricated pipe pile 1, and the limiting member 3 includes a plurality of struts connected at an angle to the inner side of the blocking member, and there are more than three struts to ensure the stability of the setting of the blocking plate 2; specifically, the blocking plate 2 is a steel plate, and the limiting member 3 is a steel bar welded at an angle to the steel plate, and the bottom end of the limiting member 3 exceeds the top of the prefabricated pipe pile 1, so that when in use, the plurality of struts extend into the cavity of the prefabricated pipe pile 1, and each of them is pressed against the cavity wall of the prefabricated pipe pile 1.

[0047] S4. Construction of prefabricated pipe piles 1; specifically, the plate thickness exceeds 10mm, and the diameter matches the outer diameter of the prefabricated pipe pile 1, facilitating alignment and protection. The steel bars are locked to the inner wall of the prefabricated pipe pile 1 through friction. During static pile construction, the blocking plate 2 is pressed in synchronously with the top section of the prefabricated pipe pile 1, with the pile top elevation control error ≤±20mm. By using the blocking plate 2, the backfill can be blocked outside the hole of the prefabricated pipe pile 1. During subsequent excavation, manual cleaning work can be avoided by simply removing the blocking plate tool. The blocking plate can be recycled, saving costs, shortening the construction period, and improving construction efficiency.

[0048] More reliable, when prefabricated pipe pile 1 is constructed, the silt layer pile speed is ≤1m / min, the final pressure is ≤1.2 times of the designed pull-out force, and the verticality is monitored in real time

[0049] S5. After the construction of the prefabricated pile 1 is completed, remove the blocking plate 2 and set a steel cage in the chamber of the prefabricated pile 1;

[0050] A baffle is provided at the bottom of the steel cage; the baffle can be provided on the inner wall of the prefabricated pipe pile 1 or at the bottom of the steel cage to support the concrete and to separate the steel cage and the prefabricated pipe pile 1 chamber. No further details will be given here.

[0051] S6. Extend the steel cage into the pre-set depth in the cavity of the prefabricated pipe pile 1; the preset depth shall be based on actual calculations. Generally, the pouring depth of concrete in the cavity of the prefabricated pipe pile 1 shall not be less than 45% of the depth of the cavity of the prefabricated pipe pile 1; in this solution, the preset depth of the steel cage extended into the cavity of the prefabricated pipe pile 1 is 50% of the depth of the cavity of the prefabricated pipe pile 1. Correspondingly, the pouring depth of concrete in the cavity of the prefabricated pipe pile 1 is 50% of the depth of the cavity of the prefabricated pipe pile 1, which serves the purpose of optimizing the core pouring depth, enables one-time pouring and molding, avoids delamination defects, and at the same time saves concrete and reduces construction costs.

[0052] S7. A steel cage positioning hoop is set at the top of the prefabricated pipe pile 1. The steel cage positioning hoop is used to fix each pile main reinforcement of the steel cage at the corresponding preset position; a special standardized positioning hoop is installed above the pile mouth to prevent the pile main reinforcement from being displaced and close together, resulting in insufficient anchoring force in the later stage.

[0053] The reinforcement cage positioning hoop includes a support inner ring 4 and a plurality of limiting forks 5 arranged circumferentially therearound. The limiting forks include a first fork arm and a second fork arm, the first fork arm and the second fork arm being arranged parallel to the support inner ring 4. The first fork arm and the second fork arm form an outward-facing limiting groove between the support inner ring 4. The number of limiting forks is consistent with the number of main reinforcement bars in the reinforcement cage. When in use, the support inner ring 4 and the reinforcement cage are arranged coaxially, and the limiting forks limit the main reinforcement bars of the piles in a one-to-one correspondence, with each main reinforcement bar of the pile being located at the bottom of the corresponding limiting groove. This further enhances the structural strength, reduces the shaking or displacement of the main reinforcement bars in the reinforcement cage, improves the construction quality of the prefabricated pipe pile 1, and reduces the mutual interference between the main reinforcement bars of adjacent piles.

[0054] S8. A hopper is set at the top of the prefabricated pipe pile 1, and the hopper has a blanking port connected to the cavity of the prefabricated pipe pile 1; the hopper includes a base 6 with a blanking port and a bucket body 7 connected to the base 6, and the base 6 has a protective edge that is bent upward to wrap around the bottom of the bucket body 7, reducing the risk of leakage, and plays a role in limiting and positioning the bucket body 7, making the assembly of the two more convenient and the combination stable and reliable; the bucket body 7 has a slope towards the blanking port, making pouring and blanking more convenient and reducing concrete overflow; the base 6 of the hopper is set on the top surface of the prefabricated pipe pile 1, and the blanking port is sleeved on the part of the steel cage extending out of the prefabricated pipe pile 1 and connected to the cavity of the prefabricated pipe pile 1; the bucket body 7 is also provided with a handle, which is convenient for carrying and use; through the use of the hopper, the concrete pouring area and position can be specified, which is suitable for prefabricated pipe piles 1 with a small inner hollow diameter, especially the split design of the base 6 and the bucket body 7, which can facilitate the cleaning of the hopper and improve construction efficiency.

[0055] S9. Pour concrete into the cavity of the prefabricated pipe pile 1; the baffle forms a barrier to the concrete poured into the cavity of the prefabricated pipe pile 1; specifically, during the pouring process, A. Use C40 slightly expansive concrete (expansion rate 0.02%~0.04%) with a slump of 180±20mm; B. Pour in three layers (each layer ≤1m), insert Φ50 vibrating rod into the lower layer 200mm, the vibration spacing ≤400mm, and the duration ≥30s / layer. C. When the concrete is lowered, the hopper can effectively reduce material waste. The detachable hopper is easy to construct and can be reused. Its turnover utilization rate is ≥90%, which is green and environmentally friendly. D. The core length is controlled at about 2.5m, which is half the length of the cavity of the prefabricated pipe pile 1. The size and spacing of the steel bars are evenly controlled. The vibrating rod can be effectively operated, which greatly improves the density of the pile core. One-time pouring can achieve defect-free entire section; the construction time of a single pile is significantly reduced;

[0056] S10. After pouring is completed and the concrete has initially set, remove the hopper and the steel cage positioning hoop; repeat this process for the next unit, greatly saving construction costs.

[0057] S11. An anchor assembly is provided at the top of the prefabricated pipe pile 1;

[0058] The anchor assembly includes a plurality of anchor plates 8 arranged around the top of the prefabricated pipe pile 1. The anchor plates 8 are vertically fixed to the top surface of the prefabricated pipe pile 1. The anchor assembly also includes anchor bars 9 corresponding to the number of anchor plates 8. The diameter of the anchor bars 9 is larger than the diameter of the main reinforcement of the pile in the steel cage, so that the anchor bars 9 bear the main pull-out force, and the main reinforcement of the pile compensates for the shrinkage stress of the concrete. The anchor bars 9 are connected to the anchor plates 8 in a one-to-one correspondence. The anchor bars 9 include a vertical section extending vertically upward and a vertical section extending vertically upward. The straight section is a bent section with a set angle. The anchor bar 9 is arranged on the anchor plate 8 through the vertical section. After the anchor bar 9 is arranged on the prefabricated pipe pile 1 through the anchor plate 8, the top of the bent section faces outward, and the angle between the bent section and the vertical section is not less than 150°. In this solution, it is 155°, forming a high-strength and rigid anchoring node; thereby, the use of pile main bars can be reduced, the spacing between adjacent pile main bars can be expanded, the steel bar density can be reduced, and the fluidity of concrete can be improved; the vibrating rod can fall smoothly, greatly improving the density of the core filling.

[0059] Specifically, the anchor plate 8 and the anchor rib 9 are prefabricated, and the anchor rib 9 is fully welded along the length side of the anchor plate 8, and the weld is a double-sided fillet weld; the structural strength is guaranteed and has high pull-out resistance.

[0060] S12. After tying the raft slab reinforcement, pour concrete.

[0061] Compared with conventional solutions, this solution reduces the total amount of steel bars by 47% and the amount of concrete by 55%, greatly saving construction costs and significantly improving construction efficiency.

[0062] The present solution also discloses a second embodiment in which only the structure of the steel cage positioning hoop is different, and the implementation process only involves adjusting the bottom bracket 6 having the steel cage positioning hoop, wherein the steel cage positioning hoop includes a U-shaped bolt 10, a nut 11 adapted to the U-shaped bolt 10, and a limiting portion 12 for mounting the U-shaped bolt 10, wherein the limiting portion 12 is provided on the bottom bracket 6 of the hopper; when in use, the U-shaped bolt 10 sets the main reinforcement of the pile of the steel cage in the groove of the U-shaped bolt 10, and the U-shaped bolt 10 is assembled to the limiting portion 12 through the nut 11; it should be understood that there are two nuts 1 adapted to the U-shaped bolt 10, which are correspondingly fastened to the two ends of the U-shaped bolt 10 when in use, so that the U-shaped bolt 10 limits the main reinforcement of the pile corresponding to the steel cage;

[0063] The number of the cage locating hoops matches the number of pile main bars in the cage. This ensures that, during use, the hoops position the pile main bars in a one-to-one relationship, with each pile main bar being positioned within the slot of a corresponding U-bolt 10 and connected to the base support 6. This further enhances structural strength. Furthermore, the hoops are evenly distributed around the axial direction and radial direction of the precast tubular pile 1, improving the construction quality of the precast tubular pile 1 and reducing interference between the main bars of adjacent piles.

[0064] In this embodiment, the limiting portion 12 is L-shaped, with the horizontal side of the L fixed to the base 6 by welding. The vertical side of the L is provided with a through-hole I for the U-shaped bolt 10. During use, the U-shaped bolt 10 passes through the vertical side of the L and is locked by the corresponding nut 11. The structure of the limiting portion 12 ensures that the steel cage positioning hoop reliably holds the corresponding pile main bar in place within the cage, reducing any shaking or displacement of the pile main bar within the cage and improving the construction quality of the prefabricated tubular pile 1.

[0065] This solution also discloses a third embodiment in which only the structure of the steel cage positioning hoop is different, and the implementation process only involves the step of adjusting the base support 6 with the steel cage positioning hoop, wherein the steel cage positioning hoop includes a U-shaped latch 13 and an insert 15 for mounting the U-shaped latch 13; the top foot of the U-shaped latch 13 has an upwardly bent limiting hook 14, and the insert 15 is arranged on the base support 6 of the hopper; when in use, the U-shaped latch 13 sets the main reinforcement of the steel cage pile in the groove of the U-shaped latch 13, and the U-shaped latch 13 extends into the insert 15 through the limiting hook 14 and is correspondingly limited;

[0066] The number of the steel cage positioning hoops is the same as the number of pile main bars in the steel cage; so that when in use, the steel cage positioning hoops limit the pile main bars in a one-to-one correspondence, and each pile main bar is limited in the groove of the corresponding U-shaped pin 13 and connected to the base 6; and the plurality of the steel cage positioning hoops are evenly distributed in the radial direction of the prefabricated pipe pile 1 around the axial direction of the prefabricated pipe pile 1, so as to improve the construction quality of the prefabricated pipe pile 1 and reduce the mutual interference between the main bars of adjacent piles.

[0067] The base of the pin is fixed to the base 6 by welding. The insert block 15 has a through hole II for one of the top legs of the U-shaped pin 13 to pass through. There are two insert blocks 15, corresponding to the number of top legs of the U-shaped pin 13. The structure of the U-shaped pin 13 provides a certain limit function, which also helps to reduce the shaking or displacement of the main reinforcement in the reinforcement cage, improving the construction quality of the prefabricated pipe pile 1. It is also lightweight and easy to operate during use. This structure is also suitable for prefabricated pipe piles 1 with smaller radial dimensions, making it more versatile.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A prefabricated pipe pile construction method, characterized by: The construction steps include: S1. Set prefabricated pipe piles in the foundation of the preset area; S2. After the construction of the prefabricated piles is completed, a steel cage is provided in the chamber of the prefabricated piles; the chamber of the prefabricated piles has a baffle that blocks the steel cage and the prefabricated pile chamber; S3. The steel cage is extended to a preset depth within the prefabricated pile chamber; S4. Pour concrete into the cavity of the precast pile; a barrier is formed to the cavity of the precast pile to pour concrete; S5. After pouring is completed, an anchor assembly is set on top of the prefabricated pile; S6. After tying the raft slab reinforcement, pour concrete.

2. The prefabricated pipe pile construction method according to claim 1, characterized in that: The method further includes step S3a. A hopper is provided at the top of the prefabricated pipe pile, wherein the hopper has a discharge port connected to the cavity of the prefabricated pipe pile; and in step S4, concrete is poured into the cavity of the prefabricated pipe pile through the hopper.

3. The prefabricated pipe pile construction method according to claim 2, characterized in that: Step S3a also includes setting a steel cage positioning hoop at the top of the prefabricated pipe pile, and the steel cage positioning hoop is used to fix each pile main reinforcement of the steel cage at a corresponding preset position.

4. The prefabricated pipe pile construction method according to claim 3, characterized in that: The steel cage positioning hoop includes a support inner ring and a plurality of limit forks arranged in the circumference of the support inner ring, the limit fork includes a first fork arm and a second fork arm, the first fork arm and the second fork arm are arranged parallel to the support inner ring, and a limit groove open outward is formed between the first fork arm and the second fork arm and the support inner ring. The number of the limit forks is consistent with the number of pile main bars in the steel cage; when in use, the limit forks limit the pile main bars in a one-to-one correspondence, and each pile main bar is located at the bottom of the corresponding limit groove.

5. The prefabricated pipe pile construction method according to claim 3, characterized in that: The hopper includes a base with a material discharge opening and a hopper body connected to the base, and the hopper body has a slope toward the material discharge opening; The bottom support of the hopper is arranged on the top surface of the prefabricated pipe pile, and the drop-out port is sleeved on the portion of the steel cage extending out of the prefabricated pipe pile and communicated with the cavity of the prefabricated pipe pile.

6. The prefabricated pipe pile construction method according to claim 5, characterized in that: The steel cage positioning hoop includes a U-shaped bolt, a nut adapted to the U-shaped bolt, and a limiting portion for installing the U-shaped bolt, wherein the limiting portion is arranged on the bottom support of the hopper; when in use, the U-shaped bolt sets the main reinforcement of the steel cage in the groove of the U-shaped bolt, and the U-shaped bolt is assembled to the limiting portion through the nut; The number of the steel cage positioning hoops is the same as the number of pile main bars in the steel cage; so that when in use, the steel cage positioning hoops limit the pile main bars in a one-to-one correspondence, and each pile main bar is limited in the groove of the corresponding U-shaped bolt.

7. The prefabricated pipe pile construction method according to claim 1, characterized in that: The pouring depth of concrete in the prefabricated pipe pile cavity shall not be less than 45% of the depth of the prefabricated pipe pile cavity.

8. The prefabricated pipe pile construction method according to claim 1, characterized in that: The anchoring assembly includes a plurality of anchoring plates arranged around the top of the prefabricated pipe pile, and the anchoring assembly also includes anchoring bars corresponding to the number of anchoring plates, and the anchoring bars are connected to the anchoring plates in a one-to-one correspondence.

9. The prefabricated pipe pile construction method according to claim 1, characterized in that: The anchor bar includes a vertical section pointing vertically upward and a bent section at a set angle to the vertical section. After the anchor bar is set on the prefabricated pipe pile through the anchor plate, the top of the bent section faces outward.

10. The prefabricated pipe pile construction method according to claim 1, characterized in that: The anchor plate is vertically fixed to the top surface of the prefabricated pipe pile, and the angle between the bent section and the vertical section is not less than 150°.

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