Construction method for removing prestressed pipe piles

Abstract

The present invention relates to a construction method for removing prestressed pipe piles, comprising the steps of customizing steel sleeves, driving steel sleeves, recycling mud sedimentation, removing prestressed pipe piles, and backfilling and compacting grouting of pile holes. The beneficial effects of the present invention are as follows: using customized steel sleeve bottom reinforcement technology, using inverted triangular ribs to reinforce the bottom of the steel sleeve, which has the effect of reinforcing the steel sleeve and serves as an auxiliary device for breaking the ground; using high-pressure water pipes and high-pressure air pipes at the bottom to form a high-pressure water-gas curtain to liquefy the soil, solving the problem of difficulty in driving the steel sleeve; using three-stage sedimentation tank disposal and recycling mud technology, the filling material after the removal of the prestressed pipe piles is processed from the mud solids after the three-stage sedimentation tank disposal and recycling, saving construction costs; using steel casing encounter obstacle disposal technology, through the cooperation of drilling rigs and drilling guide frames to solve the problem of obstacles hindering construction during the driving of steel casing.

Description

Technical Field

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

[0002] Traditional methods of removing prestressed pipe piles are nothing more than manually excavating the soil around the pile foundation to expose the pile body, or using mechanical equipment to peel off the soil around the pile to reduce the friction between the pile body and the soil, and then lifting the pile body. Recently, there is a method of driving a steel casing and then jetting the pile to extract it. A certain length of the pile is exposed by manually digging a hole, and then a steel casing is driven in. The soil in the casing is liquefied by jetting water, and then the pipe pile is removed. However, this method also has certain disadvantages: if the soil layer has good connectivity, the steel casing is not easy to drive, or the driving rate is slow, which seriously affects the construction progress; the soil layer is not easy to liquefy. If the pile body is long, the effect of jetting water to liquefy the soil is not good, which affects the subsequent pile extraction construction.

[0003] In view of this, in order to solve the above problems, it is urgent to invent a method to deal with the problems encountered in the prestressed pipe pile removal construction and improve the prestressed pipe pile removal construction efficiency. Summary of the invention

[0004] The purpose of the invention is to overcome the deficiencies in the prior art and provide a prestressed pipe pile removal construction method.

[0005] The prestressed pipe pile removal construction method comprises the following steps:

[0006] S00, Customized steel sleeve: Customized steel sleeve according to the prestressed pipe pile to be removed, steel sleeve, steel pipe support and inverted triangle rib plate are welded inside the steel sleeve, and external fixing frame is welded;

[0007] S10, Steel Sleeve Driving: High-pressure water pipes and high-pressure air pipes are installed in the steel sleeves, the steel sleeves are hoisted and driven, and obstacles are handled by drilling rigs and drilling guide frames; the soil is liquefied by high-pressure water pipes and high-pressure air pipes to form mud, and the mud is extracted to expose the prestressed pipe piles;

[0008] S20, mud sedimentation recycling: the liquefied mud is pumped out and connected to the tertiary sedimentation tank from the water inlet, the mud is precipitated through the first baffle and the second baffle, the upper wastewater is discharged through the water outlet, and the mud and sand solids are made into self-mixing filler;

[0009] S30, removing the prestressed pipe pile: using the prestressed pipe pile clamp and the sling to remove the prestressed pipe pile;

[0010] S40, backfilling and compaction grouting of pile holes: arranging grouting holes between pipe piles and filling them with the self-mixing filling material obtained in step S. The grouting pipe includes a PVC casing and a steel grouting pipe. After grouting, the steel grouting pipe is pulled out and the PVC casing is retained in the soil.

[0011] Preferably, in step S00, the external fixing frame includes a fixing frame positioning ring, a fixing frame vertical rod, a fixing frame base and a fixing rod. The external fixing frame is placed outside the steel sleeve, and the fixing rod at the lower end of the external fixing frame is inserted into the soil and adjusted vertically with a plumb bob.

[0012] Preferably, in step S10, a high-pressure water pipe and a high-pressure air pipe are arranged in the steel casing. When the steel sleeve is driven, an external fixing frame fixes the position of the steel sleeve, a guide ring covers the pile foundation to be removed, and after the steel sleeve is driven into the soil, the high-pressure water pipe and the high-pressure air pipe are started to pass through the steel casing to form a high-pressure water vapor curtain at the lower part of the steel sleeve to liquefy the soil, and the inverted triangular ribs are used to break the soil to assist in driving the steel sleeve.

[0013] Preferably, when an obstacle is encountered on the steel sleeve driving path in step S10, a drilling guide frame is arranged outside the steel sleeve, and a drilling rig is used to drill along the drilling guide frame in cooperation with the drilling rig drill rod to drill through the obstacle encountered by the steel sleeve to a diameter through which the steel sleeve can pass, and the steel sleeve is continued to be driven in; the drilling guide frame comprises an outer support ring, a transverse connecting rod, an inner support ring, a fixing rod and a vertical connecting rod, and is a three-layer structure, the outer support ring and the inner liner ring in the same layer are fixedly connected by the transverse connecting rod, the drilling guide frame is fixedly connected in the vertical direction by the vertical connecting rod, and a fixing rod is welded to the lower part of the outer support ring of the bottom layer. During construction, the inner support ring of the drilling guide frame is hooped with the steel sleeve, the fixing rod is inserted into the soil and fixed so that the vertical connecting rod is parallel to the outer wall of the steel sleeve, the drilling rig drill rod is inserted between the outer support ring and the inner liner ring of the drilling guide frame and started, so that the drill rod drills along the drilling guide frame to drill through the obstacle at the bottom of the steel casing.

[0014] Preferably, in step S20, the three-stage sedimentation tank body includes a sedimentation tank side plate and a sedimentation tank bottom plate, and two partition slots are arranged in the long direction of the tank wall, and the first partition and the second partition are respectively inserted into the partition slots to divide the three-stage sedimentation tank into three tank structures; the first partition surface material is a first partition water filter net, and the second partition surface is provided with a second partition water filter net on the upper part, and the lower part is a solid structural plate, and an open movable partition slot is arranged on one side of the side wall between the first partition and the second partition, and a movable partition is engaged in the movable partition slot to make the tank body closed, and a water-stop rubber strip is arranged on the contact surface between the movable partition and the movable partition slot.

[0015] Preferably, in step S20, the tertiary sedimentation tank is placed on a sedimentation tank steel frame, and the sedimentation tank steel frame includes a sedimentation tank platform and a sedimentation tank bracket. During construction, the mud is precipitated through the first partition and the second partition, and the upper wastewater is discharged through the outlet. After sedimentation, the first partition and the second partition are removed to combine the three tanks of the tertiary sedimentation tank into a large tank. After sedimentation, cement and coarse and fine aggregates are added to the silt solids and residual water and mixed to form a self-mixing filling material. After the self-mixing filling material reaches the use standard, the movable partition is removed to form a gap in the tank body, and the self-mixing filling material is poured from the gap to the engineering cart for use in construction.

[0016] Preferably, in step S10, if the prestressed pipe pile is exposed and the pile body is found to be tilted, a steel base plate is welded to the upper and lower parts of the inner wall of the steel casing, and a jack is welded to the steel base plate. The jacks relatively support the tilted pile body segments, and the jacks are started to squeeze the pile body to make it straight.

[0017] Preferably, in step S10, after the prestressed pipe pile is exposed, it is found that the pile body is broken, and a prestressed pipe pile clamp is installed on the upper part of the broken pile body, the prestressed pipe pile clamp includes a fixing clamp, two fixing clamps are provided with ear blocks on both sides, the ear blocks are provided with bolt holes at both ends, and a sling hole is provided in the middle. During construction, the fixing clamp is hooped on the upper part of the broken pile body of the pile foundation to be removed, the two fixing clamps are fixed with bolts, the sling is passed through the sling hole and fixed to the crane, and the broken segment of the pile body is lifted out by the sling.

[0018] Preferably, in step S30, the piles are removed by using an interval-jumping construction method.

[0019] The beneficial effects of the present invention are:

[0020] 1) This application adopts customized steel sleeve bottom reinforcement technology, and uses inverted triangular ribs to reinforce the bottom of the steel sleeve, which has the effect of reinforcing the steel sleeve and serves as an auxiliary device for breaking the ground; high-pressure water pipes and high-pressure air pipes are used at the bottom to form a high-pressure water-gas curtain to liquefy the soil, solving the problem of difficulty in installing the steel sleeve.

[0021] 2) The three-stage sedimentation tank treatment and recycling mud technology is adopted. The filling material after the prestressed pipe piles are removed is processed from the mud solids after the three-stage sedimentation tank treatment and recycling, which saves construction costs.

[0022] 3) Adopt the technology of handling obstacles in steel casing, and solve the problem of obstacles hindering construction during the installation of steel casing through the cooperation of drilling rig and drilling guide frame.

[0023] 4) The original pile tilting treatment technology is adopted to solve the problem of the pile body tilting during the removal of prestressed pipe piles through the jack; the broken pile treatment technology is adopted to solve the problem of the prestressed pipe pile body fracture affecting the removal construction efficiency through the prestressed pipe pile clamp; the interval pile extraction technology is adopted to solve the problem that the continuous and uninterrupted extraction of prestressed pipe piles causes excessive disturbance to the soil, affecting the subsequent extraction of surrounding pipe piles.

[0024] 5) The double-layer casing grouting technology of outer PVC and inner steel casing is adopted to solve the problem of difficulty in removing the grouting steel pipe after drilling and grouting to reinforce the soil. At the same time, the grouting steel pipe is reused to save construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the construction method for removing prestressed pipe piles;

[0026] Figure 2 It is a customized steel casing construction diagram;

[0027] Figure 3 It is a schematic diagram of the cross-section structure of a customized steel casing;

[0028] Figure 4 is a schematic diagram of the structure of an independent external fixing frame;

[0029] Figure 5 It is a schematic diagram of the structure of the three-stage sedimentation tank;

[0030] Figure 6 It is a schematic diagram of the slot of the three-stage sedimentation tank;

[0031] Figure 7 This is a schematic diagram of the steel frame structure of the three-stage sedimentation tank;

[0032] Figure 8 This is a top view schematic diagram of the construction of the drilling guide frame;

[0033] Fig. 9 is a schematic diagram of the drilling guide frame structure;

[0034] Fig.10 This is a schematic diagram of the construction of prestressed pipe pile tilting treatment;

[0035] Fig.11 This is a schematic diagram of the construction section of the inclined treatment of prestressed pipe piles;

[0036] Fig.12 It is a schematic diagram of the construction of prestressed fracture treatment;

[0037] Fig.13 It is a schematic diagram of the structure of the prestressed pipe pile fixture;

[0038] Fig.14 This is a schematic diagram of the construction of prestressed pipe piles with interval pulling;

[0039] Fig.15 It is a schematic diagram of the double-layer casing structure of outer PVC and inner steel casing;

[0040] Fig.16 It is a cross-sectional diagram of the double-layer casing structure of outer PVC and inner steel casing;

[0041] Fig.17 It is a flow chart of the construction method for removing prestressed pipe piles.

[0042] Among them: 1. Steel sleeve, 2. Steel casing, 3. Steel pipe support, 4. Guide ring, 5. Inverted triangle rib, 6. External fixing frame, 7. High-pressure water pipe, 8. High-pressure air pipe, 9. Fixing frame positioning ring, 10. Fixing frame vertical rod, 11. Fixing frame base, 12. Water inlet, 13. Water outlet, 14. Sedimentation tank side plate, 15. Sedimentation tank bottom plate, 16. First baffle, 17. First baffle water filter net, 18. Solid structure plate, 19. Second baffle, 20. Second baffle water filter net, 21. First baffle card slot, 22. Second baffle card slot, 23. Movable baffle card trough, 24. movable partition, 25. water-stop strip, 26. sedimentation tank platform, 27. sedimentation tank bracket, 28. outer support ring, 29. horizontal connecting rod, 30. inner support ring, 31. steel bottom plate, 32. jack, 33. sling, 34. fixing fixture, 35. bolt, 36. ear block, 37. sling hole, 38. PVC sleeve, 39. pile foundation a to be removed, 40. pile body fracture, 41. pile foundation b to be removed, 42. pile foundation c to be removed, 43. grouting hole, 44. steel grouting pipe, 45. fixing rod, 46. vertical connecting rod, 47. bolt hole. DETAILED DESCRIPTION

[0043] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0044] As an example, Fig.17 As shown, a prestressed pipe pile removal construction method comprises the following steps:

[0045] like Figures 1 to 4 As shown, step S00: weld the steel casing 2, steel pipe support 3 and inverted triangular rib 5 and other structures inside the steel sleeve 1, and weld the independent external fixing frame 6. In step S00, the independent external fixing frame 6 is welded by the fixing frame positioning ring 9, the fixing frame vertical rod 10, the fixing frame base 11 and the fixing rod 45. The external fixing frame 6 is placed in the steel sleeve, and the lower end fixing rod 45 is inserted into the soil and adjusted vertically with a plumb bob.

[0046] Step S10: A high-pressure water pipe 7 and a high-pressure gas pipe 8 are arranged in the steel casing 2. When the steel sleeve 1 is driven, the external fixing frame 6 fixes the position of the steel sleeve 1, and the guide ring 4 covers the pile foundation to be removed. After the steel sleeve 1 is driven into the soil, the high-pressure water pipe 7 and the high-pressure gas pipe 8 are started to form a high-pressure water vapor curtain at the bottom of the steel sleeve 1 through the steel casing 2 to liquefy the soil, and the inverted triangular rib plate 5 is used to break the soil so that the steel sleeve 1 is driven in smoothly. When encountering obstacles, the drilling rig and the drilling guide frame are used to deal with them.

[0047] like Figures 8 to 9 As shown, the drilling guide frame is composed of an outer support ring 28, a transverse connecting rod 29, an inner support ring 30, a fixed rod 45 and a vertical connecting rod 46, and is a three-layer structure. The outer support ring 28 and the inner support ring 30 are fixedly connected by the transverse connecting rod 29, and are fixedly connected by the vertical connecting rod 46. A fixed rod 45 is welded to the lower part of the bottom outer support ring 28. During construction, the inner support ring 30 of the drilling guide frame is encircled by the steel sleeve 1, and the fixed rod 45 is inserted into the soil and fixed so that the vertical connecting rod 46 is parallel to the outer wall of the steel sleeve 1. The drill rod of the drilling rig is inserted between the outer support ring 28 and the inner support ring 30 of the drilling guide frame and started, so that the drill rod drills along the drilling guide frame to drill through the obstacles at the bottom of the steel casing.

[0048] like Figure 10 to Figure 11 As shown, after the prestressed pipe pile is exposed, it is found that the pile body is tilted, then a steel bottom plate 31 is welded to the upper and lower parts of the steel casing 2, and a temporary fixing jack 32 device is welded on the steel bottom plate 31. The jack 32 relatively supports the tilted pile body segment, and the jack 32 is started. The pile body is squeezed and straightened by the jacks 32 arranged relatively above and below.

[0049] like Figure 12 to Figure 13 As shown, after the prestressed pipe pile is exposed, the pile body is found to be broken, and a prestressed pipe pile clamp is installed on the upper part of the pile body broken part 40. The prestressed pipe pile clamp is composed of two fixing clamps 34, and ear blocks 36 are arranged on both sides of the fixing clamp 34. Bolt holes 47 are arranged at both ends of the ear blocks 36, and a sling hole 37 is arranged in the middle. During construction, the fixing clamp 34 is hooped on the upper part of the pile body broken part 40 of the pile foundation to be removed. The pile foundation to be removed in this embodiment is the pile foundation a39 to be removed. The two fixing clamps 34 are fixed with bolts 35, and the sling 33 is passed through the sling hole 37 and fixed to the crane, and the broken segment of the pile body is lifted out by the sling 33.

[0050] like Figures 5 to 7As shown, step S20: extract the liquefied mud in step S10 and connect the mud pipe to the water inlet 12 of the third-stage sedimentation tank. The third-stage sedimentation tank body is composed of a sedimentation tank side plate 14 and a sedimentation tank bottom plate 15. A partition card slot is provided in the long direction of the tank wall. The first partition 16 and the second partition 19 are inserted into the partition card slot to divide the third-stage sedimentation tank into three tank structures. The first partition 16 board surface material is a first partition water filter net 17, and the second partition 19 board surface is provided with a second partition water filter net 20 on the upper part, and a solid structure plate 18 on the lower part. An open movable partition card slot 23 is provided on one side of the side wall between the first partition 16 and the second partition 19, and the movable partition 24 is engaged with the movable partition card slot 23 to make the tank body To form a closure, a waterproof rubber strip 25 is provided on the contact surface between the movable partition 24 and the movable partition slot 23. During construction, the three-stage sedimentation tank is placed on the sedimentation tank steel frame, which is composed of a sedimentation tank platform 26 and a sedimentation tank bracket 27. The mud is precipitated through the first partition 16 and the second partition 19, and the upper wastewater is discharged through the outlet 13. After sedimentation, the first partition 16 and the second partition 19 are removed to combine the tank body from three tanks into one large tank. After sedimentation, cement and other coarse and fine aggregates are added to the silt solids and residual water to mix them into self-mixing filling material. After the self-mixing filling material reaches the use standard, the movable partition 24 is removed to form a gap in the tank body, and the self-mixing filling material is poured from the gap to the engineering cart for construction use.

[0051] like Fig.14 As shown, step S30: the prestressed pipe pile clamp cooperates with the sling 33 to pull out the prestressed pipe pile. When pulling out, pay attention to the interval pile construction, that is, first construct the pile foundation a39 to be pulled out, then construct the pipe pile b41 to be pulled out, and finally the pipe pile b42 to be pulled out.

[0052] like Figure 15 to Figure 16 As shown, step S40: the pile hole backfill material adopts the self-mixing filling material produced by recycling the mud sediment in step S20. When grouting reinforcement is performed on the soil between the pipe piles, grouting holes 43 are arranged between the pipe piles. The grouting pipe adopts an outer PVC sleeve 38 and an inner steel grouting pipe 44. After grouting, the inner steel grouting pipe 44 is pulled out and the PVC sleeve 38 is retained in the soil.

Claims

1. A prestressed pipe pile removal construction method, characterized in that: The following steps are involved: S00, custom steel sleeve: custom steel sleeve (1) according to the prestressed pipe pile to be removed, weld steel sleeve (2), steel pipe support (3) and inverted triangle rib plate (5) inside the steel sleeve (1), and weld external fixing frame (6); S10, steel sleeve installation: a high-pressure water pipe (7) and a high-pressure air pipe (8) are arranged in the steel sleeve (2), the steel sleeve (1) is suspended and installed, and obstacles are handled by a drilling machine and a drilling guide frame when encountered; the soil is liquefied by the high-pressure water pipe (7) and the high-pressure air pipe (8) to form mud, and the mud is extracted to expose the prestressed pipe pile; S20, mud sedimentation recycling: the liquefied mud is extracted and connected to the third-level sedimentation tank from the water inlet (12), the mud is precipitated through the first partition (16) and the second partition (19), the upper wastewater is discharged through the water outlet (13), and the mud and sand solids are made into self-mixing filling materials; the third-level sedimentation tank body includes a sedimentation tank side plate (14) and a sedimentation tank bottom plate (15), two partition card slots are arranged in the long direction of the tank wall, the first partition (16) and the second partition (19) are respectively inserted into the partition card slots to divide the third-level sedimentation tank into three tank structures; the first partition (16) is made of a first partition water filter net (17), the second partition (19) is provided with a second partition water filter net (20) on the upper part of the plate surface, and a solid structure plate (18) is provided on the lower part, and an open movable partition card slot ( 23), a movable partition (24) is engaged in the movable partition slot (23) to form a closed tank body, and a waterproof rubber strip (25) is provided on the contact surface between the movable partition (24) and the movable partition slot (23); the three-stage sedimentation tank is placed on a sedimentation tank steel frame, and the sedimentation tank steel frame includes a sedimentation tank platform (26) and a sedimentation tank bracket (27). During construction, mud is precipitated through the first partition (16) and the second partition (19), and upper wastewater is discharged through the outlet (13). After precipitation, the first partition (16) and the second partition (19) are removed to combine the three tanks of the three-stage sedimentation tank into a large tank. After precipitation, cement and coarse and fine aggregates are added to the sediment solids and residual water to be mixed to form a self-mixing filling material. After the self-mixing filling material reaches the use standard, the movable partition (24) is removed to form a gap in the tank body, and the self-mixing filling material is poured from the gap into the engineering cart for construction use; S30, removing the prestressed pipe pile: using a prestressed pipe pile clamp in conjunction with a sling (33) to remove the prestressed pipe pile; S40, backfilling and compacting grouting of pile holes: arranging grouting holes (43) between the pipe piles and filling them with the self-mixing filling material obtained in step S20. The grouting pipe includes a PVC sleeve (38) and a steel grouting pipe (44). After grouting, the steel grouting pipe (44) is removed and the PVC sleeve (38) is retained in the soil.

2. The prestressed pipe pile removal construction method according to claim 1 is characterized in that: In step S00, the external fixing frame (6) comprises a fixing frame positioning ring (9), a fixing frame vertical rod (10), a fixing frame base (11) and a fixing rod (45). The external fixing frame (6) is placed outside the steel sleeve (1), and the fixing rod (45) at the lower end of the external fixing frame (6) is inserted into the soil and adjusted vertically with a plumb bob.

3. The prestressed pipe pile removal construction method according to claim 1 is characterized in that: In step S10, a high-pressure water pipe (7) and a high-pressure air pipe (8) are arranged in the steel casing (2). When the steel sleeve (1) is driven, the external fixing frame (6) fixes the position of the steel sleeve (1), and the guide ring (4) covers the pile foundation to be removed. After the steel sleeve (1) is driven into the soil, the high-pressure water pipe (7) and the high-pressure air pipe (8) are started to pass through the steel casing (2) to form a high-pressure water vapor curtain at the bottom of the steel sleeve (1) to liquefy the soil, and the inverted triangular rib plate (5) is used to break the soil to assist the driving of the steel sleeve (1).

4. The prestressed pipe pile removal construction method according to claim 1 is characterized in that: When the steel sleeve (1) encounters an obstacle on the installation path in step S10, a drilling guide frame is arranged outside the steel sleeve (1), and a drilling machine is used to drill along the drilling guide frame in cooperation with the drilling machine drill rod to drill the steel sleeve (1) to drill through the obstacle to a diameter through which the steel sleeve (1) can pass, and then the steel sleeve (1) is continuously driven in; the drilling guide frame comprises an outer support ring (28), a transverse connecting rod (29), an inner support ring (30), a fixing rod (45) and a vertical connecting rod (46), and is a three-layer structure, wherein the outer support ring (28) and the inner support ring (30) in the same layer are connected to each other. The two guide frames are fixedly connected by a transverse connecting rod (29), and the two guide frames are fixedly connected by a vertical connecting rod (46) in the vertical direction. A fixing rod (45) is welded to the lower part of the outer supporting ring (28) of the bottom layer. During construction, the inner supporting ring (30) of the guide frame is encircled with the steel sleeve (1), and the fixing rod (45) is inserted into the soil and fixed so that the vertical connecting rod (46) is parallel to the outer wall of the steel sleeve (1). The drill rod of the drilling rig is inserted between the outer supporting ring (28) and the inner supporting ring (30) of the guide frame and started, so that the drill rod is drilled along the guide frame to drill through the obstacles at the lower part of the steel casing.

5. The prestressed pipe pile removal construction method according to claim 1 is characterized in that: In step S10, after the prestressed pipe pile is exposed, if the pile body is found to be tilted, a steel bottom plate (31) is welded to the upper and lower parts of the inner wall of the steel casing (2), and a jack (32) is welded to the steel bottom plate (31). The jack (32) relatively supports the tilted pile body segment, and the jack (32) is started to squeeze the pile body to make it straight.

6. The prestressed pipe pile removal construction method according to claim 1 is characterized in that: In step S10, after the prestressed pipe pile is exposed, it is found that the pile body is broken, and a prestressed pipe pile clamp is installed on the upper part of the pile body broken part (40), the prestressed pipe pile clamp comprises a fixing clamp (34), two fixing clamps (34) are provided with ear blocks (36) on both sides, the ear blocks (36) are provided with bolt holes (47) at both ends, and a sling hole (37) is provided in the middle. During construction, the fixing clamp (34) is hooped on the upper part of the pile body broken part (40) of the pile foundation to be removed, the two fixing clamps (34) are fixed by bolts (35), the sling (33) is passed through the sling hole (37) and fixed to the crane, and the broken segment of the pile body is lifted out by the sling (33).

7. The prestressed pipe pile removal construction method according to claim 1 is characterized in that: In step S30, the pile jumping construction is adopted during the removal.

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