Construction method for removing residual piles by lubrication of pile casing at multiple points

Abstract

This invention relates to a method for removing residual piles by multi-point pull-out using a pile perimeter sleeve lubrication system. The method includes steps such as locating the old pile to be removed, fabricating clamping rings, fabricating and assembling the pile perimeter sleeve, installing high-pressure mud pipes, static pressure on the pile perimeter sleeve, clamping the pile with the clamping rings, removing the old pile to be removed, removing the pile perimeter sleeve, treating the pile extraction hole, and recovering the components. A high-pressure mud pipe is installed on the outer side of the sleeve surrounding the old pile to be removed, and connected to a high-pressure jetting shoe at the bottom of the sleeve. During static pressure, bentonite mud is simultaneously sprayed onto the sleeve shoe, thereby forming a lubricating layer on the inner and outer sides of the pile perimeter sleeve, significantly reducing the lateral friction resistance experienced by the sleeve during sinking or pile extraction. Several clamping rings are vertically spaced inside the sleeve. The old pile to be removed is first extracted using a lifting device and multi-point cables, followed by the removal of the sleeve, effectively reducing the friction force experienced during the extraction of the old pile. This method is safe, reliable, and causes minimal disturbance to the soil.

Description

Technical Field

[0001] This invention relates to the construction of circular concrete pile foundation extraction, specifically to a method for removing residual piles by multi-point pulling with lubrication of the pile perimeter sleeve. Background Technology

[0002] In municipal construction, underground rail transit, and railway construction projects, existing underground piles pose significant obstacles to the construction of new pile foundations or the development of underground spaces. It is necessary to extract these old piles. Traditional direct pile extraction methods rely on the power of extraction machinery to overcome the pile's peripheral resistance and weight, which suffers from problems such as excessive stress on the pile top and the pile's inability to be extracted or breakage. This severely impacts the overall construction efficiency and the quality of the new project. To address the problems of traditional pile extraction methods, it is necessary to develop a method that allows for continuous pile extraction, minimizes peripheral resistance, and can adapt to piles at different depths. Summary of the Invention

[0003] The purpose of this invention is to address the problems existing in the current concrete pile foundation extraction construction by proposing a multi-point pull-out construction method for removing residual piles using a pile perimeter sleeve lubrication system.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] A method for removing residual piles by multi-point pull-out lubrication of pile perimeter sleeves, characterized by the following construction steps:

[0006] S1. Locating the old pile to be removed: Accurately locate the position of the old pile to be removed, excavate a trench to expose the pile head, and determine the length of the high-pressure mud pipe around the pile.

[0007] S2. Clamping retaining ring fabrication:

[0008] S2.1. Make a circular clamping retaining ring. Set 3 to 8 support block rotation grooves and a corresponding number of extension support blocks at intervals along the outer wall of the clamping retaining ring. Set a rotation shaft at the inner end of the extension support block. The extension support block rotates around the rotation shaft in the support block rotation groove. Weld a spring fixing ring at the bottom end of the extension support block.

[0009] S2.2. Three to eight inner grooves and corresponding wedge blocks are provided along the inner wall of the clamping ring.

[0010] S2.3. A horizontal spring groove is made at the bottom of the extension block and at the center of gravity of the wedge block. A slider channel is set on the outermost side of the spring groove, and corresponding stroke electromagnetic sliders are installed respectively.

[0011] S2.4 Drill 12 cable holes that penetrate the clamping ring at even intervals along the side wall of the clamping ring.

[0012] S2.5 Install the cables symmetrically and in stages into the designated clamping ring cable holes, and secure them at the bottom with fixing nuts.

[0013] S2.6. Make high-strength springs of specified lengths, and install pin springs and wedge springs in the spring grooves at the bottom of the extension block and the center of gravity of the wedge block, respectively. Install telescopic pins on one side of the pin springs through spring retaining rings, and fix the block springs to the bottom of the extension block and the block rotation groove.

[0014] S3. Fabrication and assembly of pile perimeter sleeves:

[0015] S3.1. Fabricate a high-pressure injection boot with internal vertical and circumferential channels, and install multiple high-pressure nozzles at intervals on the inner and outer walls of the high-pressure injection boot.

[0016] S3.2. Fabricate a standard sleeve section with matching internal and external threads at both ends. Install the first standard sleeve section on the bottom high-pressure injection shoe. The bottom is connected to the high-pressure injection shoe using a connecting thread + weld method.

[0017] S3.3. Fabricate a stop-slip sleeve section. The two ends of the stop-slip sleeve section are respectively provided with internal and external threads that match the standard sleeve section, and the inside is provided with a stop-slip protrusion ring that fits tightly against the inner wall.

[0018] S3.4. Non-continuously, clamping rings and stop-sliding sleeve sections are installed between standard sleeve sections at the bottom, middle and top elevations of the old pile to be pulled out, with the clamping ring cable extending to the top of the sleeve around the pile.

[0019] S3.5 Apply electromagnetic force to the electromagnetic slider B at the position of the wedge block spring to confine the wedge block spring within the spring groove, with the wedge block tightly against the side wall of the inner groove.

[0020] S3.6 When the electromagnetic slider A at the outer end of the telescopic pin is in the retracted state, the telescopic pin extends out of the spring groove under the action of the pin spring and is locked at the bottom of the extension block. The extension block is in the maximum horizontal rotation state and is locked at the bottom of the anti-slip convex ring.

[0021] S4. High-pressure grout pipe installation: The high-pressure grout pipe is installed on the outside of the pile casing by welding fasteners. The high-pressure grout pipe is connected to the vertical channel of the high-pressure jetting pipe shoe to form a grouting channel.

[0022] S5. Static pressure of the pile casing: The high-pressure jetting shoe at the bottom of the driven casing is pressed downwards, and high-pressure mud is simultaneously passed through the high-pressure mud pipe, vertical channel, circumferential channel and high-pressure nozzle to cut the soil around the pile to form a lubricating layer; the casing with a length exceeding that of the old pile to be pulled is statically pressed into the soil layer. During the casing extension process, standard casing sections or anti-slip casing sections are added according to the design plan until it sinks to the predetermined depth.

[0023] S6. Clamping retaining ring clamping pile:

[0024] S6.1, When the electromagnetic slider A of the electromagnetic control telescopic pin spring groove is in the extended state, the pin spring and telescopic pin are restricted in the spring groove. The extension block rotates downward under the action of the block spring, and the clamping retaining ring can freely pass upward through the anti-slip convex ring section in the lubrication layer.

[0025] S6.2 The electromagnetic slider B on the outer side of the concave wedge block under electromagnetic control contracts within the slider channel. Under the action of the high-strength spring force, the wedge block extends outward and presses against the old pile body to be pulled out.

[0026] S6.3. The old pile to be pulled out is pulled out by graded cables. While the main body of the clamping ring moves upward, the wedge block moves downward relative to the inclined surface of the groove in the clamping ring due to the frictional resistance of the pile body, thereby continuously clamping the old pile body to be pulled out during the pulling process.

[0027] S7. Removal of old piles to be removed: The retaining rings at different positions of the old piles to be removed are connected to the pile driver winch for synchronous and slow extraction until the old piles to be removed are completely removed.

[0028] S8. Removal of the casing around the pile: During the removal of the casing, high-pressure slurry is injected into the bottom of the pipe simultaneously using the high-pressure nozzle of the high-pressure jetting shoe. Grouting is carried out while the casing is being removed until it is completely removed.

[0029] S9. Treatment of pile extraction holes: After the old piles are extracted, backfill them in sections with backfill material, and then inject cement grout into the entire extracted pile body.

[0030] S10. Component recycling: The electromagnetic slider is moved by electromagnetic control and struck to separate the clamping retaining ring wedge block from the old pile to be pulled out. The clamping retaining ring is removed, and the pile is cleaned and recycled for reuse.

[0031] Preferably, in S2, the clamping retaining rings are arranged in three stages from bottom to top on the pile sleeve: a first-stage retaining ring, a second-stage retaining ring, and a third-stage retaining ring, and the outer wall support block rotation groove, the inner wall groove, and the cable hole of the clamping retaining ring are staggered.

[0032] Preferably, in S2, the cable level corresponds to the clamping ring, and the corresponding clamping ring cable hole is provided with a first-level cable, a second-level cable, and a third-level cable respectively; the number of cables in each level is 4, and they are symmetrically arranged on the clamping ring; the first-level cable extends from the bottom of the old pile to be extracted to the pile extraction equipment at the hole opening, and only the first-level cable is provided on the first-level ring; the second-level cable extends from the center of the old pile to be extracted to the pile extraction equipment at the hole opening, and the second-level ring is provided with both the first-level cable and the second-level cable; the third-level cable extends from the top of the old pile to be extracted to the pile extraction equipment at the hole opening, and the third-level ring is provided with both the first-level cable, the second-level cable, and the third-level cable.

[0033] Preferably, in S2 and S3, the electromagnetic slider includes electromagnetic slider A located at the outer end of the telescopic pin in the retracted state and electromagnetic slider B located at the outer end of the wedge-shaped spring in the retracted state.

[0034] Preferably, in S3, the high-pressure jetting boot is located at the bottom of the pile casing, and its outer diameter is 3-5 cm larger than that of the standard casing section. A vertical channel is provided at the outer side of the standard casing section's outer diameter and connected to the high-pressure mud pipe. The inner diameter of the upper half of the high-pressure jetting boot is the same as that of the standard casing section's outer diameter, and a connecting thread matching the external thread of the standard casing section is provided on the inner wall. The inner diameter of the lower half is 2-4 cm smaller than that of the standard casing section's inner diameter, and a welding bevel is provided at the change in inner diameter between the upper and lower half.

[0035] Preferably, in S3, the standard sleeve section and the anti-slip sleeve section have the same outer diameter, and the inner diameter of the standard sleeve section is 8-15cm larger than the diameter of the old pile to be pulled out; the inner diameter of the anti-slip convex ring on the inner side of the anti-slip sleeve section is 2-4cm smaller than that of the standard sleeve section, and the number of them on the pile perimeter sleeve is 3, corresponding to the number and position of the clamping retaining rings.

[0036] Preferably, in S5, a double-layer lubrication layer is formed between the inner side of the pile casing and the old pile to be pulled out, and between the outer side of the pile casing and the surrounding soil, under the action of the high-pressure mud pipe and the high-pressure nozzle.

[0037] Preferably, in S2 and S6, the high-strength spring includes a pin spring, a wedge spring, and a support spring. Each side of the high-strength spring is provided with an end hook. The pin spring controls the horizontal movement of the telescopic pin within the pin spring groove. The wedge spring controls the horizontal movement of the wedge block between the inner groove and the old pile to be pulled out. The support spring controls the extension support block to rotate around the rotation axis.

[0038] Preferably, in S2 and S6, a spring retaining ring is provided in the spring groove and at the connection position with the high-strength spring, and the spring retaining ring is fixed to the end hook of the high-strength spring.

[0039] Preferably, in S2 and S6, the electromagnetic slider A at the outer end of the telescopic pin shaft and the electromagnetic slider B at the outer end of the wedge block spring are controlled independently.

[0040] The technical solution involved in this invention has the following advantages compared with traditional technologies:

[0041] 1. A high-pressure mud pipe is installed on the outside of the casing around the old pile to be extracted, and connected to the high-pressure jetting shoe at the bottom of the casing. During the static pressure process, bentonite mud is sprayed synchronously into the casing shoe, thereby forming a lubricating layer on the inside and outside of the casing around the pile, which greatly reduces the side friction resistance encountered by the casing during sinking or pile extraction, resulting in high construction efficiency.

[0042] 2. Several clamping rings are vertically spaced inside the casing. Several concave wedge blocks with spring control are evenly arranged circumferentially between the clamping rings and the pile body. During the lowering process, the wedge blocks retract into the clamping rings. During the pulling process, the wedge blocks are pressed against the pile body by the elastic force of high-strength springs and electromagnetic control. The old pile to be pulled out is removed by multi-point cable pulling. The construction principle is reliable and the operation is simple.

[0043] 3. As the cable pulls the clamping ring body upward, the wedge block moves downward relative to the inclined surface inside the clamping ring due to the frictional resistance of the pile body. This continuously clamps the pile body during the pulling process. By pulling the pile body from multiple points, the concentrated tension on the pile head is changed to tension at multiple points on the entire pile, which reduces the force on the pile body and effectively reduces the phenomenon of pile breakage.

[0044] 4. The pile extraction casing includes a pipe shoe, a standard casing section, and a stop-slide casing section. The stop-slide casing section can be extended between standard casing sections as needed, and the number of clamping retaining rings can be changed to reduce uneven stress on the pile to be extracted, meet the needs of pile extraction of different lengths, and has a wide range of applications.

[0045] 5. The clamping retaining ring wedge block and the extension support block are controlled by high-strength spring force and electromagnetic control, which can precisely control the state of the clamping retaining ring, thereby completing the casing sinking and pulling effect and ensuring the quality of pile extraction.

[0046] 6. The old piles to be pulled out are removed first by lifting the lifting device, and then the casing is removed to complete the removal of the old piles. This method effectively reduces the friction force on the old piles to be pulled out, making it safe and reliable, and causing little disturbance to the soil. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of a multi-point pull-out sleeve structure for lubricating and removing residual piles.

[0048] Figure 2 This is a schematic diagram of a standard casing section;

[0049] Figure 3 This is a schematic diagram of a standard casing section.

[0050] Figure 4 This is a schematic diagram of the stop block sleeve section structure;

[0051] Figure 5 This is a schematic diagram of the cross-section of the stop block sleeve section;

[0052] Figure 6 This is a schematic diagram of the high-pressure injection tube shoe structure;

[0053] Figure 7 This is a schematic diagram of the cross-section of the high-pressure injection tube shoe;

[0054] Figure 8 This is a schematic diagram of the high-pressure injection pipe shoe;

[0055] Figure 9 This is a schematic diagram of the connection between the standard sleeve section and the stop block sleeve section;

[0056] Figure 10 This is a schematic diagram showing the connection between the high-pressure jetting boot, the standard sleeve section, and the stop block sleeve section.

[0057] Figure 11 This is a schematic diagram of the static pressure construction of the multi-point pull-out removal of residual pile casing (step S5).

[0058] Figure 12 This is a schematic diagram of the construction process for removing old piles by lubrication and multi-point pulling to remove residual piles and pile casings (step S7).

[0059] Figure 13 This is a schematic diagram of the clamping retaining ring in its initial state (static pressure process);

[0060] Figure 14 This is a schematic diagram of the structural state during the pile extraction process with the clamping retaining ring.

[0061] Figure 15 This is a schematic cross-sectional view of the clamping retaining ring in its initial state (static pressure process);

[0062] Figure 16 This is a schematic diagram of the state profile during the pile extraction process with the clamping retaining ring;

[0063] Figure 17 This is a schematic diagram of the wedge block tightly adhering to the inner groove (static pressure process). Figure 15 (Detailed diagram of node A in the middle)

[0064] Figure 18 This is a schematic diagram of the wedge block popping out of the inner groove (pile extraction process). Figure 16 (Detailed diagram of node B in the middle)

[0065] Figure 19 This is a schematic diagram showing the maximum rotation of the extension block (static pressure process) when the telescopic pin is extended. Figure 15 (Detailed diagram of node C in the middle)

[0066] Figure 20 This is a schematic diagram showing the minimum rotation of the extension block when the telescopic pin retracts (during the pile extraction process). Figure 16 (Detailed diagram of node D in the middle)

[0067] Figure 21 This is a schematic diagram of a high-strength spring structure;

[0068] Figure 22 This is a plan view of the cross-section of the primary retaining ring;

[0069] Figure 23 This is a cross-sectional plan view of the secondary retaining ring;

[0070] Figure 24This is a plan view of the cross-section of the three-stage retaining ring;

[0071] Figure 25 This is a schematic diagram of the top section of the old pile before pile extraction (step S1).

[0072] Figure 26 This is a schematic diagram of the cross-section of the clamping ring and the pile clamp (step S6).

[0073] Figure 27 This is a schematic diagram of the cross-section of the high-pressure jetting pipe shoe after pile extraction (step S7).

[0074] Figure 28 This is a schematic diagram of the standard casing section after pile extraction (step S7).

[0075] Figure 29 This is a schematic diagram of the cross-section after the pile casing is removed (step S8).

[0076] Figure 30 This is a schematic diagram of the cross-section after the pile hole has been treated (step S9).

[0077] Figure 31 This is a flowchart illustrating the construction process for removing residual piles using a multi-point pull-out method with lubrication of the pile casing.

[0078] The diagram is labeled as follows: 1-Pile perimeter casing, 2-Standard casing section, 3-Anti-slip sleeve section, 301-Anti-slip convex ring, 4-High-pressure jetting shoe, 401-Welding bevel, 402-Vertical channel, 403-Circumferential channel, 404-High-pressure nozzle, 5-Clamping retaining ring, 501-Extension support block, 502-Support block rotation groove, 503-Inner groove, 504-Wedge block, 505-Inner diameter hole, 506-Cable hole, 507-Rotating shaft, 508-First-level retaining ring, 509-Second-level retaining ring, 5010-Third-level retaining ring, 6-Old pile to be pulled out, 7-Soil around the pile, 8-Lubricating layer, 9-High-pressure mud pipe, 10-Fixing. Components, 11-Pile extraction hole, 12-Cable, 1201-Primary cable, 1202-Secondary cable, 1203-Tertiary cable, 13-Connecting thread, 1301-Internal thread, 1302-External thread, 14-Weld, 15-High-strength spring, 1501-End hook, 1502-Pin spring, 1503-Wedge block spring, 1504-Support block spring, 16-Telescopic pin, 17-Electromagnetic slider, 1701-Electromagnetic slider A, 1702-Electromagnetic slider B, 18-Slider channel, 19-Spring retaining ring, 20-Backfill material, 21-Spring groove, 22-Fixing nut, 23-High-pressure mud. Detailed Implementation

[0079] To enhance understanding of the present invention, reference will be made below. Figures 1 to 31The embodiments of the present invention will be described in detail below. The following embodiments are implemented based on the technical solution of the present invention and provide detailed implementation methods. However, the protection scope of the present invention is not limited to the following embodiments.

[0080] In this embodiment, the old pile 6 to be pulled has a diameter of 100cm and a length of 22m. The standard sleeve section 2 has a length of 5.0m and an inner diameter of 110cm. The anti-slip sleeve section 3 has a length of 20cm and an inner diameter of 108cm. The anti-slip protrusion ring 301 has a height of 10cm. Anti-slip sleeve sections 3 and corresponding internal clamping retaining rings 5 ​​are set at pile depths of 1m, 11m and 21m respectively. The first-level retaining ring 508 is provided with four first-level cables 1201. The second-level retaining ring 509 is provided with four first-level cables 1201 and four second-level cables 1202. The third-level retaining ring 5010 is provided with four first-level cables 1201, four second-level cables 1202 and four third-level cables 1203.

[0081] In light of the above, and in conjunction with the appendix Figure 31 The following construction steps are adopted.

[0082] S1, Positioning of old pile 6 to be removed: (in conjunction with attached...) Figure 25 As shown, the location of the old pile 6 to be pulled out is precisely located, a trench is excavated to expose the pile head of the old pile 6 to be pulled out, and the length of the high-pressure mud pipe 9 around the pile is determined.

[0083] S2, Making the clamping retaining ring 5.

[0084] S2.1, combined with appendix Figure 13 ~Appendix Figure 16 As shown, a circular clamping retaining ring 5 is made. 3 to 8 support block rotating grooves 502 and a corresponding number of extension support blocks 501 are arranged at intervals along the outer wall of the clamping retaining ring 5. A rotating shaft 507 is provided at the inner end of the extension support block 501. The extension support block 501 rotates around the rotating shaft 507 in the support block rotating groove 502. A spring fixing ring 19 is welded to the bottom end of the extension support block 501.

[0085] S2.2, combined with appendix Figure 13 ~Appendix Figure 16 As shown, 3 to 8 inner grooves 503 and corresponding wedge blocks 504 are provided along the inner wall of the clamping retaining ring 5.

[0086] S2.3, combined with appendix Figure 17 ~Appendix Figure 20 As shown, a horizontal spring groove 21 is provided at the bottom of the extension block 501 and at the center of gravity of the wedge block 504. A slider channel 18 is provided on the outermost side of the spring groove 21, and corresponding stroke electromagnetic sliders 17 are installed thereon.

[0087] S2.4, combined with appendix Figure 13 Appendix Figure 14As shown, 12 cable holes 506 are drilled evenly at intervals along the side wall of the clamping ring 5, penetrating the clamping ring 5.

[0088] S2.5, combined with appendix Figure 11 Appendix Figure 12 As shown, the cable 12 is symmetrically and progressively installed into the cable hole 506 of the designated clamping ring 5, and fixed at the bottom with a fixing nut 22.

[0089] S2.6, combined with appendix Figure 17 ~Appendix Figure 20 As shown, a high-strength spring 15 of a specified length is manufactured. A pin spring 1502 and a wedge spring 1503 are installed in the spring groove 21 at the bottom of the extension block 501 and the center of gravity of the wedge block 504, respectively. A telescopic pin 16 is installed on one side of the pin spring 1502 through a spring retaining ring 19, and the block spring 1504 is fixed to the bottom of the extension block 501 and the block rotation groove 502.

[0090] Combined with the appendix Figure 1 As shown, the clamping retaining rings 5 ​​are arranged from bottom to top on the pile sleeve 1 as a first-level retaining ring 508, a second-level retaining ring 509, and a third-level retaining ring 5010, and the outer wall support block rotation groove 502, the inner wall groove 503, and the cable hole 506 of the clamping retaining ring 5 are staggered.

[0091] Combined with appendix Figure 22 Appendix Figure 23 Appendix Figure 24 As shown, the cable level 12 corresponds to the clamping ring 5. The corresponding clamping ring 5 cable hole 506 is provided with a first-level cable 1201, a second-level cable 1202, and a third-level cable 1203 respectively. There are 4 cables of each level 12, and they are symmetrically arranged on the clamping ring 5. The first-level cable 1201 extends from the bottom of the old pile 6 to be extracted to the pile extraction equipment at the hole opening. Only the first-level cable 1201 is provided on the first-level ring 508. The second-level cable 1202 extends from the center of the old pile 6 to be extracted to the pile extraction equipment at the hole opening. The second-level ring 509 is provided with both the first-level cable 1201 and the second-level cable 1202. The third-level cable 1203 extends from the top of the old pile 6 to be extracted to the pile extraction equipment at the hole opening. The third-level ring 5010 is provided with both the first-level cable 1201, the second-level cable 1202, and the third-level cable 1203.

[0092] S3, Fabrication and assembly of pile perimeter sleeve 1.

[0093] S3.1, combined with appendix Figure 6 Appendix Figure 7 Appendix Figure 8 As shown, a high-pressure injection boot 4 with an internal vertical channel 402 and an circumferential channel 403 is manufactured, and multiple high-pressure nozzles 404 are arranged at intervals on the inner and outer walls of the high-pressure injection boot 4.

[0094] S3.2, combined with appendix Figure 1 ~Appendix Figure 3 Appendix Figure 10 As shown, a standard sleeve section 2 is manufactured, with matching internal threads 1301 and external threads 1302 at both ends. The first standard sleeve section 2 is installed on the bottom high-pressure injection shoe 4, and the bottom is connected to the high-pressure injection shoe 4 by connecting thread 13 + weld 14.

[0095] S3.3, combined with appendix Figure 4 Appendix Figure 5 Appendix Figure 9 As shown, a stop-slip sleeve section 3 is manufactured. The two ends of the stop-slip sleeve section 3 are respectively provided with internal threads 1301 and external threads 1302 that match the standard sleeve section 2, and the inside is provided with a stop-slip protrusion ring 301 that is tightly attached to the inner wall.

[0096] S3.4, combined with appendix Figure 1 Appendix Figure 11 Appendix Figure 12 As shown, clamping rings 5 ​​and stop-sliding sleeve sections 3 are installed discontinuously between standard sleeve sections 2 at the bottom, middle and top elevations of the old pile 6 to be pulled out. The clamping ring 5 has a cable 12 that extends to the top of the sleeve 1 around the pile.

[0097] S3.5, combined with appendix Figure 15 Appendix Figure 17 As shown, an electromagnetic force is applied to the electromagnetic slider B1702 at the position of the wedge block spring 1503 to restrict the wedge block spring 1503 within the spring groove 21, and the wedge block 504 is in close contact with the side wall of the inner groove 503.

[0098] S3.6, combined with appendix Figure 15 Appendix Figure 19 As shown, the electromagnetic slider A1701 at the outer end of the telescopic pin 16 is in the retracted state. The telescopic pin 16 extends out of the spring groove 21 under the action of the pin spring 1502 and is locked at the bottom of the extension block 501. The extension block 501 is in the maximum horizontal rotation state and is locked at the bottom of the anti-slip protrusion ring 301.

[0099] Combined with appendix Figure 1 Appendix Figure 9 Appendix Figure 10As shown, the high-pressure jetting boot 4 is located at the bottom of the pile perimeter casing 1, and its outer diameter is 3-5 cm larger than that of the standard casing section 2. A vertical channel 402 is provided on the outer side of the standard casing section 2 and connected to the high-pressure mud pipe 9. The inner diameter of the upper half of the high-pressure jetting boot 4 is the same as that of the standard casing section 2, and a connecting thread 13 matching the external thread 1302 of the standard casing section 2 is provided on the inner wall. The inner diameter of the lower half is 2-4 cm smaller than that of the standard casing section 2, and a welding bevel 401 is provided at the change in inner diameter between the upper and lower half. The outer diameters of the standard casing section 2 and the anti-slip sleeve section 3 are the same. The inner diameter of the standard casing section 2 is 8-15 cm larger than that of the old pile 6 to be pulled. The inner diameter of the anti-slip protrusion 301 on the inner side of the anti-slip sleeve section 3 is 2-4 cm smaller than that of the standard casing section 2. There are 3 of them on the pile perimeter casing 1, which corresponds to the number and position of the clamping retaining rings 5.

[0100] S4, High-Pressure Slurry Pipe 9 Installation: (In conjunction with attached...) Figure 1 Appendix Figure 11 Appendix Figure 12 As shown, a high-pressure grout pipe 9 is installed on the outside of the pile sleeve 1 by welding fastener 10. The high-pressure grout pipe 9 is connected to the vertical channel 402 of the high-pressure jetting pipe shoe 4 to form a grouting channel.

[0101] S5, Static pressure of pile perimeter sleeve 1: combined with appendix Figure 11 As shown, the high-pressure jetting shoe 4 at the bottom of the drive casing is pressed downwards statically, and high-pressure mud is simultaneously passed through the high-pressure mud pipe 9, vertical channel 402, circumferential channel 403 and high-pressure nozzle 404 to cut the soil around the pile 7 to form a lubrication layer 8; the casing with a length exceeding that of the old pile 6 to be pulled is statically pressed into the soil layer. During the casing extension process, standard casing section 2 or anti-slip casing section 3 is added according to the design scheme until it sinks to the predetermined depth.

[0102] Combined with appendix Figure 11 Appendix Figure 12 Appendix Figure 26 As shown, a double-layer lubrication layer 8 is formed between the inner side of the pile sleeve 1 and the old pile 6 to be pulled out, and between the outer side of the pile sleeve 1 and the surrounding soil 7, under the action of the high-pressure mud pipe 9 and the high-pressure nozzle 404.

[0103] S6, Clamping retaining ring 5 clamping pile: combined with attached Figure 12 Appendix Figure 14 Appendix Figure 16 Appendix Figure 18 Appendix Figure 20 As shown.

[0104] S6.1, combined with appendix Figure 12 Appendix Figure 14 Appendix Figure 16 Appendix Figure 20When the electromagnetic control telescopic pin 16, spring groove 21, and electromagnetic slider A1701 are in the extended state, the pin spring 1502 and telescopic pin 16 are restricted in the spring groove 21. The extension block 501 rotates downward under the action of the block spring 1504, and the clamping retaining ring 5 can freely pass upward through the anti-slip convex ring 301 section in the lubrication layer 8.

[0105] S6.2, combined with appendix Figure 18 As shown, the electromagnetic slider B1702 on the outer side of the electromagnetically controlled concave wedge block 504 retracts within the slider channel 18, and the wedge block 504 extends outward under the elastic force of the high-strength spring 15 and presses against the old pile 6 to be pulled out.

[0106] S6.3, combined with appendix Figure 12 As shown, the old pile 6 to be pulled out is pulled out by the graded cable 12. While the main body of the clamping ring 5 moves upward, the wedge block 504 moves downward relative to the inclined surface of the groove 503 inside the clamping ring 5 due to the frictional resistance of the pile body, thereby continuously clamping the pile body of the old pile 6 to be pulled out during the pulling process.

[0107] S7. Removal of old pile 6 to be pulled: (in conjunction with attached...) Figure 26 Appendix Figure 27 Appendix Figure 28 As shown, the clamping rings 5 ​​and cables 12 at different positions of the old pile 6 to be pulled out are connected to the pile driver winch for synchronous and slow pulling until the old pile 6 to be pulled out is completely removed.

[0108] S8, Removal of Pile Peripheral Sleeve 1: (in conjunction with attached...) Figure 29 As shown, during the process of removing the casing, high-pressure slurry 23 is simultaneously injected into the bottom of the casing using the high-pressure jetting pipe shoe 4 and the high-pressure nozzle 404. Grouting is carried out while the casing is being removed until the casing 1 around the pile is completely removed.

[0109] S9, Treatment of Pile Extraction Hole 11: (in conjunction with attached...) Figure 30 As shown, after the old pile 6 is removed, backfill 20 sections with backfill material, and then inject cement grout into the entire removed pile body.

[0110] S10. Component recycling: The electromagnetic slider 17 is moved by electromagnetic control and struck to separate the clamping ring 5 wedge block 504 from the old pile 6 to be pulled out. The clamping ring 5 is removed, cleaned, recycled and reused.

[0111] Combined with appendix Figure 15 ~Appendix Figure 20 As shown in S2 and S3, the electromagnetic slider 17 includes an electromagnetic slider A1701 located at the outer end of the telescopic pin 16 in the retracted state and an electromagnetic slider B1702 located at the outer end of the wedge block spring 1503 in the retracted state.

[0112] Combined with appendix Figure 15 ~Appendix Figure 21As shown in S2 and S6, the high-strength spring 15 includes a pin spring 1502, a wedge spring 1503, and a support spring 1504. Each side of the high-strength spring 15 has an end hook 1501. The pin spring 1502 controls the horizontal movement of the telescopic pin 16 within the pin spring groove 21. The wedge spring 1503 controls the horizontal movement of the wedge block 504 between the inner groove 503 and the old pile 6 to be pulled out. The support spring 1504 controls the rotation of the extension support block 501 around the rotating shaft 507. A spring retaining ring 19 is provided within the spring groove 21 and at the connection point with the high-strength spring 15. The spring retaining ring 19 is fixed to the end hook 1501 of the high-strength spring 15. The electromagnetic slider A1701 at the outer end of the telescopic pin 16 and the electromagnetic slider B1702 at the outer end of the wedge spring 1503 are independently controlled.

[0113] The above embodiments are only used to explain the technical concept of the present invention, and are not intended to limit the protection of the present invention. Any non-substantial modifications made to the present invention using this concept should fall within the protection scope of the present invention.

Claims

1. A method for removing residual piles by multi-point pull-out lubrication of the pile casing, characterized in that... The construction steps include the following: S1. Positioning of the old pile to be pulled (6): Accurately locate the pile position of the old pile to be pulled (6), excavate a trench and expose the pile head of the old pile to be pulled (6), and determine the length of the high-pressure mud pipe (9) around the pile. S2, Clamping retaining ring (5) fabrication: S2.

1. Make a circular clamping retaining ring (5). Set 3 to 8 support block rotating grooves (502) and a corresponding number of extension blocks (501) along the outer side wall of the clamping retaining ring (5). Set a rotating shaft (507) at the inner end of the extension block (501). The extension block (501) rotates around the rotating shaft (507) in the support block rotating groove (502). Weld a spring fixing ring (19) at the bottom end of the extension block (501). S2.

2. Three to eight inner grooves (503) and corresponding wedge blocks (504) are provided along the inner wall of the clamping ring (5). S2.

3. A horizontal spring groove (21) is opened at the bottom of the extension block (501) and at the center of gravity of the wedge block (504). A slider channel (18) is set on the outermost side of the spring groove (21), and corresponding stroke electromagnetic sliders (17) are installed respectively. S2.4 Drill 12 cable holes (506) through the clamping ring (5) at even intervals along the side wall of the clamping ring (5). S2.

5. Install the cable (12) symmetrically and in stages into the cable hole (506) of the designated clamping ring (5), and fix it at the bottom with a fixing nut (22); S2.

6. Make a high-strength spring (15) of a specified length. Install a pin spring (1502) and a wedge spring (1503) in the spring groove (21) at the bottom of the extension block (501) and the center of gravity of the wedge block (504), respectively. Install a telescopic pin (16) on one side of the pin spring (1502) through a spring fixing ring (19), and fix the block spring (1504) at the bottom of the extension block (501) and the block rotation groove (502). S3, Pile perimeter sleeve (1) Fabrication and assembly: S3.

1. Make a high-pressure injection boot (4) with a vertical channel (402) and a circumferential channel (403) inside, and set multiple high-pressure nozzles (404) at intervals on the inner and outer walls of the high-pressure injection boot (4). S3.

2. Fabricate a standard sleeve section (2), with matching internal threads (1301) and external threads (1302) at both ends respectively. Install the first standard sleeve section (2) on the bottom high-pressure jetting shoe (4). The bottom is connected to the high-pressure jetting shoe (4) by connecting thread (13) + weld (14). S3.

3. Make a stop-slip sleeve section (3). The two ends of the stop-slip sleeve section (3) are respectively provided with internal threads (1301) and external threads (1302) that match the standard sleeve section (2), and the inside is provided with a stop-slip protrusion ring (301) that is close to the inner wall. S3.

4. A clamping ring (5) and a stop block sleeve section (3) are installed discontinuously between the standard sleeve sections (2) at the bottom, middle and top elevations of the old pile (6) to be pulled out. The clamping ring (5) cable (12) extends to the top of the pile-peripheral sleeve (1). S3.5 Apply electromagnetic force to the electromagnetic slider B (1702) at the position of the wedge block spring (1503) to restrict the wedge block spring (1503) in the spring groove (21) and the wedge block (504) is in close contact with the side wall of the inner groove (503); S3.6, When the electromagnetic slider A (1701) at the outer end of the telescopic pin (16) is in the retracted state, the telescopic pin (16) extends out of the spring groove (21) under the action of the pin spring (1502) and is clamped to the bottom of the extension block (501). The extension block (501) is in the maximum horizontal rotation state and is clamped to the bottom of the anti-slip protrusion (301). S4. Installation of high pressure mud pipe (9): Install the high pressure mud pipe (9) on the outside of the pile sleeve (1) by welding fastener (10). The high pressure mud pipe (9) is connected to the vertical channel (402) of the high pressure jetting pipe shoe (4) to form a grouting channel. S5, Static pressure of the pile casing (1): Drive the high-pressure jetting shoe (4) at the bottom of the casing to press downwards, and simultaneously pass the high-pressure mud through the high-pressure mud pipe (9), vertical channel (402), circumferential channel (403) and high-pressure nozzle (404) to cut the soil around the pile (7) to form a lubricating layer (8); press the casing with a length exceeding that of the old pile (6) to be pulled into the soil layer. During the casing extension process, add standard casing section (2) or anti-slip casing section (3) according to the design scheme until it sinks to the predetermined depth; S6, Clamping retaining ring (5) clamping pile: S6.1, when the electromagnetic control telescopic pin (16) spring groove (21) and electromagnetic slider A (1701) are in the extended state, the pin spring (1502) and telescopic pin (16) are restricted in the spring groove (21), the extension block (501) rotates downward under the action of the block spring (1504), and the clamping retaining ring (5) can freely pass upward through the anti-slip convex ring (301) section in the lubrication layer (8); S6.2, The electromagnetic slider B (1702) on the outside of the electromagnetically controlled concave wedge block (504) contracts in the slider channel (18), and the wedge block (504) extends outward under the elastic force of the high-strength spring (15) and presses against the old pile (6) to be pulled out. S6.

3. Pull the old pile (6) to be pulled out by graded cable (12). While the main body of the clamping ring (5) moves upward, the wedge block (504) moves downward relative to the inclined surface of the groove (503) of the clamping ring (5) due to the frictional resistance of the pile body, thereby continuously clamping the pile body of the old pile (6) to be pulled out during the pulling process. S7. Removal of old piles (6): The retaining rings (5) and cables (12) of the old piles (6) to be removed are clamped at different positions and connected to the pile driver winch for synchronous and slow removal until the old piles (6) to be removed are completely removed. S8. Removal of the pile casing (1): During the removal of the casing, high pressure slurry (23) is injected into the bottom of the pipe simultaneously using the high pressure jetting pipe shoe (4) and high pressure nozzle (404). Grouting is carried out while the casing is being removed until the pile casing (1) is completely removed. S9. Treatment of pile extraction hole (11): After the old pile (6) is extracted, backfill with backfill material (20) in sections, and then inject cement grout into the entire extracted pile body position; S10, Component recycling: The electromagnetic slider (17) is moved by electromagnetic control and struck to separate the clamping ring (5) wedge block (504) from the old pile to be pulled out (6), the clamping ring (5) is removed, and it is cleaned and recycled for reuse.

2. The method for removing residual piles by multi-point pull-out lubrication of the pile perimeter sleeve according to claim 1, characterized in that, In S2, the clamping retaining rings (5) are positioned from bottom to top on the pile sleeve (1) as a first-level retaining ring (508), a second-level retaining ring (509) and a third-level retaining ring (5010), respectively. The outer wall support block rotation groove (502), the inner wall groove (503) and the cable hole (506) of the clamping retaining rings (5) are staggered.

3. The method for removing residual piles by multi-point pull-out lubrication of the pile perimeter sleeve according to claim 2, characterized in that, In S2, the cable (12) level corresponds to the clamping ring (5), and the corresponding clamping ring (5) cable hole (506) is provided with a first-level cable (1201), a second-level cable (1202) and a third-level cable (1203); the number of each level of cable (12) is 4, and they are symmetrically arranged on the clamping ring (5); the first-level cable (1201) extends from the bottom of the old pile (6) to be pulled out to the pile pulling equipment at the hole opening, and the first-level retaining ring (508) is only provided with The first-level cable (1201) extends from the center of the old pile (6) to the pile extraction equipment at the borehole opening. The second-level retaining ring (509) is equipped with the first-level cable (1201) and the second-level cable (1202). The third-level cable (1203) extends from the top of the old pile (6) to the pile extraction equipment at the borehole opening. The third-level retaining ring (5010) is equipped with the first-level cable (1201), the second-level cable (1202) and the third-level cable (1203).

4. The method for removing residual piles by multi-point pull-out lubrication of the pile casing according to claim 1, characterized in that, In S2 and S3, the electromagnetic slider (17) includes an electromagnetic slider A (1701) located at the outer end of the telescopic pin (16) in the retracted state and an electromagnetic slider B (1702) located at the outer end of the wedge block spring (1503) in the retracted state.

5. The method for removing residual piles by multi-point pull-out lubrication of the pile perimeter sleeve according to claim 1, characterized in that, In S3, the high-pressure jetting boot (4) is located at the bottom of the pile casing (1), and its outer diameter is 3-5 cm larger than that of the standard casing section (2). A vertical channel (402) is provided at the outer side of the outer diameter of the standard casing section (2) and connected to the high-pressure mud pipe (9). The inner diameter of the upper half of the high-pressure jetting boot (4) is the same as that of the outer diameter of the standard casing section (2), and a connecting thread (13) matching the external thread (1302) of the standard casing section (2) is provided on the inner wall. The inner diameter of the lower half is 2-4 cm smaller than that of the standard casing section (2), and a welding bevel (401) is provided at the change of inner diameter between the upper and lower half.

6. The method for removing residual piles by multi-point pull-out lubrication of the pile perimeter sleeve according to claim 1, characterized in that, In S3, the standard sleeve section (2) and the anti-slip sleeve section (3) have the same outer diameter. The inner diameter of the standard sleeve section (2) is 8-15cm larger than the diameter of the old pile (6) to be pulled out. The inner diameter of the anti-slip protrusion (301) on the inner side of the anti-slip sleeve section (3) is 2-4cm smaller than that of the standard sleeve section (2). The number of them on the pile perimeter sleeve (1) is 3, which corresponds to the number and position of the clamping retaining ring (5).

7. The method for removing residual piles by multi-point pull-out lubrication of the pile perimeter sleeve according to claim 1, characterized in that, In S5, a double-layer lubrication layer (8) is formed between the inner side of the pile sleeve (1) and the old pile to be pulled (6), and between the outer side of the pile sleeve (1) and the surrounding soil (7) under the action of the high-pressure mud pipe (9) and the high-pressure nozzle (404).

8. The method for removing residual piles by multi-point pull-out lubrication of the pile perimeter sleeve according to claim 1, characterized in that, In S2 and S6, the high-strength spring (15) includes a pin spring (1502), a wedge spring (1503), and a support spring (1504). Each side of the high-strength spring (15) is provided with an end hook (1501). The pin spring (1502) controls the telescopic pin (16) to move horizontally in the pin spring groove (21). The wedge spring (1503) controls the wedge block (504) to move horizontally between the inner groove (503) and the old pile (6) to be pulled out. The support spring (1504) controls the extension support block (501) to rotate around the rotating shaft (507).

9. The method for removing residual piles by multi-point pull-out lubrication of the pile perimeter sleeve according to claim 1, characterized in that, In S2 and S6, a spring retaining ring (19) is provided in the spring groove (21) and at the connection position with the high-strength spring (15). The spring retaining ring (19) is fixed to the end hook (1501) of the high-strength spring (15).

10. The method for removing residual piles by multi-point pull-out lubrication of the pile perimeter sleeve according to claim 1, characterized in that, In S2 and S6, the electromagnetic slider A (1701) at the outer end of the telescopic pin (16) and the electromagnetic slider B (1702) at the outer end of the wedge block spring (1503) are controlled independently.

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