WO2023024590A1

WO2023024590A1 - High-pressure water jet assisted pile pulling device and construction method

Info

Publication number: WO2023024590A1
Application number: PCT/CN2022/093029
Authority: WO
Inventors: 王志华; 孙晋晶; 张鑫磊; 蔡鑫涛; 纪展鹏; 高洪梅; 申志福; 刘璐
Original assignee: 南京工业大学; 南京吉欧地下空间科技有限公司
Priority date: 2021-08-24
Filing date: 2022-05-16
Publication date: 2023-03-02
Also published as: CN113718773B; LU502844B1; CN113718773A

Abstract

Disclosed is a high-pressure water jet assisted pile pulling device, comprising a control part and a construction part. An annular water storage chamber of the construction part is connected to a high-pressure water pump by means of a water inlet pipe I, and a circular slot is provided at the bottom of the annular water storage chamber; output shafts of driving motors I in a driving area of the construction part are fixedly connected to driving gears, an annular groove is provided in the top of an annular sliding block, and sawteeth are arranged on the outer side of the annular sliding block, the annular groove is embedded in the circular slot, and the driving gears are engaged with the sawteeth; a cutting area of the construction part is fixedly connected to the bottom of the annular sliding block by means of a communicating pipe, a telescopic jet pipe of the cutting area is externally embedded in an annular cutting track along the radial direction, and a water pipe and a sand inlet pipe are arranged in the telescopic jet pipe; an extraction area suctions the cut slurry from a suction pipe and conveys the slurry to the ground by means of an output pipe; a bottom fixing area is configured to fix the construction part in an inner cavity of a pile pulling foundation. By means of the pile pulling device of the present invention, the pile pulling efficiency is improved, the pile pulling cost is reduced, and the influence of pile pulling construction on an existing structure is weakened.

Description

A high-pressure water jet assisted pile extraction equipment and construction method

technical field

The invention relates to the field of pile pulling in underground spaces, in particular to a high-pressure water jet assisted pile pulling device and a construction method.

Background technique

With the rapid development of subway rail transit, the construction environment is becoming more and more complex, and the cases of shield tunneling through roads, bridges, buildings and other structures are also increasing. It is often encountered that the existing pile foundation hinders the excavation of the shield machine. At this time, if the shield machine is directly used to cut the pile foundation, not only the steel bars inside the pile foundation will be entangled with the cutter head of the shield machine, so that the shield machine cannot work normally. , or even damage, and usually have a series of impacts on existing structures.

In view of the above problems, the following two methods are often used in current projects: (1) The construction method of building demolition and reconstruction is adopted, which is less likely to be implemented in cities and faces problems such as long construction period, high cost and complicated construction; 2) Traditional pile pulling method. Traditional pile pulling operations can be divided into vibratory pile pulling and static pile pulling. Because it is difficult to cut piles under the soil, the whole pile is generally pulled out. However, when the length of the pile foundation is long, the pull-out force required for pulling out the pile is relatively large, and the power requirements for the pile puller are high, and there may even be cases where the power of the pile puller is insufficient and the pile foundation cannot be pulled out. Low, affecting the shield construction period.

Contents of the invention

In order to solve the above problems, the present invention proposes a high-pressure water jet assisted pile pulling equipment and construction method. The pile pulling equipment uses a high-pressure water jet with sand that can rotate 360 degrees to cut concrete and main reinforcement at a specified depth inside the pile foundation, and then pull out Partial foundation. The high-pressure water jet assisted pile pulling equipment and construction method of the present invention make the length of pile pulling controllable, improve the efficiency of pile pulling, reduce the cost of pile pulling, weaken the influence of pile pulling construction on existing structures, and solve the problem of removing underground piles. Engineering puzzle with pile foundation.

In order to achieve the above object, a kind of technical scheme that the present invention takes is as follows:

A high-pressure water jet assisted pile extraction equipment, including a control unit and a construction unit, the control unit includes a control microcomputer, a high-pressure water pump, and a sand storage bucket, the construction unit is placed in the inner cavity of the pile foundation to be pulled, and the construction unit includes A protective outer cover, in which an annular water storage chamber, a driving area, a cutting area, an extraction area and a bottom fixing area are sequentially arranged from top to bottom;

The annular water storage chamber and the high-pressure water pump are connected through a water inlet pipe, the water inlet pipe is arranged on the top of the annular water storage chamber, and the bottom of the annular water storage chamber is provided with a circular slot; the driving area includes a hollow Ring slider, drive motor I and drive gear, the output shaft of the drive motor I is fixedly connected to the drive gear, the top of the ring slider is provided with a ring groove, and the outer side is provided with sawtooth, the ring groove Embedded in the circular slot, the drive gear is engaged with the sawtooth;

The cutting area is fixedly connected to the bottom of the annular slider through a connecting pipe, the cutting area includes an annular cutting track and a telescopic nozzle, and the telescopic nozzle is embedded in the annular cutting track along the radial direction. A water pipe and a sand inlet pipe are arranged in the retractable spray pipe, and the two ends of the water pipe are respectively connected with the communication pipe and the sand inlet pipe, and the sand inlet pipe is also connected with the sand storage barrel;

The extraction area includes a mud pump, which is connected to a suction pipe, and the cut mud is sucked from the suction pipe and sent to the ground through the output pipe; the bottom fixing area is used to fix the construction part in the inner cavity of the pile foundation ;

The control microcomputer is respectively connected with the high-pressure water pump, the sand storage bucket, the driving motor I, the mud pump and the retractable nozzle.

Further, the retractable nozzle includes a linear bearing and a nozzle, the nozzle is connected to the inner ring of the linear bearing, and the tail end of the outer ring of the linear bearing is sequentially provided with a bearing and a driving motor II, and the output shaft of the driving motor II Through the threaded connection of the end of the bearing and the inner ring of the linear bearing, the water pipe and the sand inlet pipe are located in the output shaft of the drive motor II;

The control microcomputer is connected with the driving motor II.

Further, a camera is arranged outside the protective cover, and the control microcomputer is connected to the camera.

Further, an interference range finder is arranged outside the telescopic nozzle, and the control microcomputer is connected with the interference range finder.

Further, a pressure sensor is arranged around the telescopic nozzle, the pressure sensor is located outside the circular cutting track, and the control microcomputer is also connected to the pressure sensor.

Further, the extraction area also includes a water flush, the water flush is located below the suction pipe, and the water flush is connected to a high-pressure water pump.

Further, the bottom fixing area includes a screw machine, and the screw machine uses a drill rod to fix the construction part in the inner cavity of the pile foundation to be pulled out, and the control microcomputer is connected with the screw machine.

Further, the plurality of drive motors I are symmetrically distributed.

The present invention also provides a construction method for high-pressure water jet assisted pile extraction equipment, comprising the following steps:

1) Build caps: Build caps above the piles to be pulled out, build columns above the caps, and connect the columns with the abutments, and reserve the position of the piles with pullouts under the caps;

2) Drilling and coring: Calculate the safe diameter of the inner cavity of the pile foundation according to the soil pressure at the cutting depth and the strength of the pile foundation concrete, and drill an inner cavity with a diameter smaller than the safe diameter in the pile foundation concrete area along the depth direction. The depth is greater than the target cutting depth, and a fixed hole is reserved in the center of the lumen;

3) Install high-pressure water jet auxiliary pile extraction equipment: put the construction part into the inner cavity, control the camera to turn to the bottom of the inner cavity, so that the bottom fixing area can be aligned with the fixing hole, and use the self-weight of the construction part to press and fix the bottom fixing area In the hole, and adjust the protective steel pipe to a vertical state; control the operation of the screw machine, so that the screw drills into the wall of the fixed hole, so that the bottom of the construction part is fixed;

4) Scanning the shape of the inner cavity of the pile foundation: turn on the interferometric rangefinder, control the drive motor I to drive the cutting area to rotate for a circle, and the control microcomputer calculates the shape data of the inner cavity through the interferometric range finder, and the control microcomputer controls the drive according to the shape data of the inner cavity Motor II, so that the distance between the nozzle and the inner cavity wall is equal;

5) Peel off the inner layer concrete and locate the position of the main reinforcement: turn on the high-pressure water pump and the mud pump, and use the high-pressure water flow to peel off the inner layer concrete; the pressure sensor transmits the measured high-pressure water jet reaction force data to the control computer in real time, and the control computer Adjust the operation of the high-pressure water pump in real time based on the reaction force data; when the reaction force data becomes larger and then becomes smaller, locate the main ribs here until all the main ribs are located. During the confirmation of the main ribs, the cutting area rotates to the surrounding of the determined main ribs Stop spraying high-pressure water jets; when all the main ribs are located, it can be further confirmed by the camera;

6) Cutting the main ribs: Control the drive motor Ⅰ to drive the cutting area according to the position information of the main ribs, aim the telescopic nozzle at the main ribs, turn on the sand storage tank and high-pressure water pump at the same time, use the water jet with sand to cut the main ribs; use the pressure sensor to measure the belt The reaction force of the sand and water jet, when the reaction force suddenly decreases, it indicates that the main rib has been cut, which can be confirmed by the camera; after confirmation, the next main rib is cut in the same steps until all the main ribs are cut;

7) Second scan of the inner cavity shape of the pile foundation: turn on the interferometer, control the driving motor I to drive the cutting area to rotate for one circle, and the control microcomputer calculates the secondary inner cavity shape data through the interferometer. The inner cavity shape data controls the driving motor II, so that the distance between the nozzle and the main rib is equal;

8) Cutting the outermost layer of concrete: control the sand storage tank to stop sand production, adjust the high-pressure water pump to increase the water pressure of the water jet and reduce the flow rate; the pressure sensor transmits the measured reaction force data of the high-pressure water jet to the control panel in real time. Microcomputer, when the reaction force in all directions changes from large to small and remains stable, turn off the ultra-high pressure water pump, mud pump, drive motor Ⅰ and drive motor Ⅱ;

9) Recycling equipment: control the screw machine in the fixed area at the bottom to retract the screw and retract the construction department;

10) Pile extraction: fix the upper main reinforcement on the pile extractor, and carry out traditional pile extraction construction.

Further, if the pile body to be pulled out is too long and the pile side frictional resistance is large, after step 8, the screw machine can be controlled to retract the drill rod and the construction part can be moved up for a certain distance, and then the screw machine can be controlled to drill the drill rod into the fixed In the hole wall, fix the bottom of the construction part, and then repeat steps 4 to 8 until the pile pulling construction is completed.

The beneficial effect of the present invention is that: the present invention utilizes the driving area to realize the 360-degree rotation of the retractable nozzle, utilizes the interference distance meter to realize the function that the distance between the nozzle and the inner cavity is equal, and simultaneously adopts the pressure sensor and the camera to realize the positioning of the main rib and complete the The purpose of cutting foundation piles is to use the screw machine in the fixed area to realize that the construction department can move up, and then realize the purpose of multi-section cutting of pile foundations to be pulled by the construction department, thereby improving the efficiency of pile pulling, reducing the cost of pile pulling, and weakening the The impact of pile pulling construction on existing structures.

Description of drawings

Fig. 1 is a schematic diagram of a longitudinal section of a high-pressure water jet assisted pile pulling device in an embodiment of the present invention;

Fig. 2 is a schematic cross-sectional view of the cutting area 14 of the high-pressure water jet assisted pile pulling equipment in the embodiment of the present invention;

Fig. 3 is a schematic cross-sectional view of the telescopic drill pipe of the high-pressure water jet assisted pile pulling equipment in the embodiment of the present invention;

Fig. 4 is a cross-sectional and longitudinal schematic diagram of the extraction area 15 of the high-pressure water jet assisted pile pulling equipment in an embodiment of the present invention;

Fig. 5 is a schematic diagram of the annular water storage chamber 12 and the driving area 13 of the high-pressure water jet assisted pile pulling equipment in the embodiment of the present invention;

Wherein, Fig. 5a is a top view of the annular water storage chamber 12 and the drive area 13, Fig. 5b is a schematic longitudinal section view of the annular water storage chamber 12 and the slider, Fig. 5c is a top view of the drive area 13, and Fig. 5d is the annular water storage chamber 12 And the schematic diagram of the longitudinal section of the slider;

Fig. 6 is a schematic diagram of the cross-section of the bottom fixing area 16 of the high-pressure water jet assisted pile pulling equipment in the embodiment of the present invention;

Fig. 7 is the schematic diagram of the longitudinal sectional view of the pile foundation after the core drilling machine drills the core in the embodiment of the present invention;

Fig. 8 is a schematic diagram of the cross section of the pile foundation before being drilled in the embodiment of the present invention;

Fig. 9 is a curve diagram of the reaction force change when the main rib is monitored in the embodiment of the present invention;

Fig. 10 is a curve diagram of the reaction force change before and after the main rib is cut in the embodiment of the present invention.

Symbols in the figure: construction part 1, protective cover 11, annular water storage chamber 12, slot 121, driving area 13, annular slider 131, annular groove 131-1, sawtooth 131-2, driving motor I 132, driving gear 133 , rotary seal 134, cutting area 14, circular cutting track 141, retractable nozzle 142, linear bearing 142-1, nozzle 142-2, linear bearing inner ring 142-11, linear bearing outer ring 142-12, bearing 142 -13. Drive motor II 142-14, water pipe 143, sand inlet pipe 144, fixed plate 145, extraction area 15, sludge pump 151, suction pipe 152, output pipe 153, water flush 154, bottom fixed area 16, screw machine 161, Drill rod 162, control unit 2, control microcomputer 21, high-pressure water pump 22, sand storage tank 23, water inlet pipe 3, communication pipe 4, camera 5, interferometer 6, pressure sensor 7, main reinforcement 8-1, outer concrete 8-2. Internal concrete 8-3.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. I, II, horizontal and vertical in the embodiments are only for better illustration of directions and distinctions function, and cannot be used as a basis for limiting the present invention.

As shown in Figure 7, the inner cavity of the pile foundation to be pulled out is the outer concrete 8-2, the main reinforcement 8-1, and the inner concrete 8-3 from the outside to the inside, and the inner concrete 8-3 is located between the main reinforcement 8-1 and the inner concrete 8-3. Concrete is called inner layer concrete, and the concrete outside the main reinforcement 8-1 is called outer layer concrete.

As shown in Figure 1, a high-pressure water jet assisted pile extraction equipment includes a control part 2 and a construction part 1. The control part 2 includes a control microcomputer 21, a high-pressure water pump 22 and a sand storage bucket 23. The construction part 1 is placed In the inner cavity of the pile foundation to be pulled out, the construction part 1 includes a protective cover 11, and an annular water storage chamber 12, a driving area 13, a cutting area 14, an extraction area 15 and a bottom The fixed area 16 and the protective cover 11 are generally made of steel.

As shown in Figure 5, the annular water storage chamber 12 and the high-pressure water pump 22 are connected through the water inlet pipe 3, the water inlet pipe 3 is arranged on the top of the annular water storage chamber 12, and the bottom of the annular water storage chamber 12 is provided with a circle shaped slot 121; the drive zone 13 includes a hollow ring-shaped slider 131, a drive motor I132 and a drive gear 133, the output shaft of the drive motor I132 is fixedly connected to the drive gear 133, and the top of the ring-shaped slider 131 An annular groove 131-1 is provided, and a serration 131-2 is provided on the outer side, the annular groove 131-1 is embedded in the circular slot 121, and the driving gear 133 is engaged with the serration 131-2; A rotary seal 134 is provided between the annular groove 131-1 and the circular groove 121; in this embodiment, two driving motors I 132 are used, and the rotation directions of the two are opposite to facilitate driving the annular slider 131 along the circular The circular slot 121 is rotated, and the use of the rotary seal 134 can ensure that the high-pressure water flow does not leak from the annular water storage chamber 12 to the annular slider 131. The drive motor I 132 can be fixed on the inside of the protective cover 11 or on the bottom of the annular water storage chamber 12 .

As shown in Figure 2, the cutting area 14 is fixedly connected with the bottom of the annular slider 131 through the connecting pipe 4, the cutting area 14 includes an annular cutting track 141 and a telescopic nozzle 142, and the telescopic nozzle 142 is along the The radial direction is externally embedded in the annular cutting track 141. The telescopic nozzle 142 is provided with a water pipe 143 and a sand inlet pipe 144. The two ends of the water pipe 143 are respectively connected with the connecting pipe 4 and the sand inlet pipe 144. The sand inlet pipe 144 is also connected to the sand storage barrel 23; in this embodiment, the telescopic nozzle 142 is fixed on the annular cutting track 141 by four arc-shaped fixing plates 145, and the Two pressure sensors 7 are installed between the block fixing plate 145 and the outer wall of the annular cutting track 141; a camera 5 is arranged outside the protective cover 11, and an interference range finder 6 is arranged outside the retractable nozzle 142;

The annular slider 131 and the cutting area 14 are connected as a whole through the connecting pipe 4, so that the driving motor I132 can drive the cutting area 14 to rotate 360 degrees;

The extraction area 15 includes a mud pump 151, the mud pump 151 is connected to the suction pipe 152, the mud after cutting is sucked from the suction pipe 152 and sent to the ground through the output pipe 153; the bottom fixing area 16 is used for the construction part 1 fixed in the inner cavity of the pile foundation;

The control microcomputer 21 is respectively connected with the high-pressure water pump 22, the sand storage bucket 23, the drive motor I132, the mud pump 151, the retractable nozzle 142, the camera 5, the interferometer 6 and the pressure sensor 7.

Specifically, as shown in Figure 3, the telescopic nozzle 142 includes a linear bearing 142-1 and a nozzle 142-2, the nozzle 142-2 is connected to the inner ring of the linear bearing 142-11, and the outer ring of the linear bearing 142- The inside of the tail end of 12 is provided with a bearing 142-13 and a driving motor II 142-14 in sequence, and the output shaft of the driving motor II 142-14 is threaded through the tail end of the bearing 142-13 and the linear bearing inner ring 142-11, so that Both the water pipe 143 and the sand inlet pipe 144 are located in the output shaft of the driving motor II 142-14;

The control microcomputer 21 is connected with the drive motor II 142-14.

In order to reduce the working efficiency of the mud pump 151, as shown in Figure 4, the extraction area 15 also includes a water flush 154, the water flush 154 is located below the suction pipe 152, and the water flush 154 is connected to the high-pressure water pump 22, so The bottom of the suction pipe 152 is a protective steel pipe distributed in the shape of a "meter". The protective steel pipe is provided with a suction hole, and water flushers 154 are respectively fixed under the protective steel pipe. The cut mud is sucked from the suction pipe 152 and sent through the output pipe 153. to the ground.

As shown in Figure 7, the bottom fixing area 16 of the construction part 1 is placed in the fixing hole, and the fixing hole is a hole reserved during drilling. As shown in Figure 6, the bottom fixing area 16 includes two The screw machine 161 fixed on the protective steel pipe, the screw machine 161 uses the drill rod 162 to fix the construction part 1 in the inner cavity of the pile foundation to be pulled out, and the control microcomputer 21 is connected with the screw machine 161.

1) Build caps: Build caps above the pile foundation to be pulled out, and reserve the position of the pile foundation with pullout under the cap;

3) Install high-pressure water jet assisted pile extraction equipment: Put the construction part 1 into the inner cavity through a crane, control the camera to turn to the bottom of the inner cavity, so that the bottom fixing area 16 can be aligned with the fixing hole, and use the self-weight of the construction part 1 Press the bottom fixing area 16 into the fixing hole, and adjust the protective steel pipe to reach a vertical state; control the operation of the screw machine 161 to drill the screw into the wall of the fixing hole, so that the bottom of the construction part 1 is fixed; generally, the construction part 1 will be manually Fine-tune it to make it vertical, and manually fix the top of the construction part 1I.

4) Scanning the shape of the inner cavity of the pile foundation: turn on the interferometer 6, control the drive motor I132 to drive the cutting area 14 to rotate for one revolution, and the control microcomputer 21 calculates the shape data of the inner cavity through the interferometer 6, and the control microcomputer 21 according to the inner cavity The cavity shape data controls the driving motor II 142-14, so that the distance between the nozzle 142-2 and the inner cavity wall is equal;

5) Peel off the inner layer concrete and locate the position of the main reinforcement 8-1: turn on the high-pressure water pump 22 and the mud pump 151, and use the high-pressure water flow to peel off the inner layer concrete; the pressure sensor 7 transmits the measured high-pressure water jet reaction force data to the control computer in real time 21. The control microcomputer 21 adjusts the operation of the high-pressure water pump 22 in real time according to the received reaction force data; when the reaction force data becomes larger and then becomes smaller, locate the main tendon 8-1 here (as shown in Figure 9), until the location All main ribs 8-1 positions, when the cutting area 14 rotates to the determined position around the main ribs 8-1 in the process of confirming the main ribs 8-1, stop spraying high-pressure water jets; when all the main ribs 8-1 positions are located, the camera 5 Further confirmation;

6) Cutting the main rib 8-1: Control the driving motor I132 to drive the cutting area 14 according to the position information of the main rib 8-1, align the telescopic nozzle 142 with the main rib 8-1, and simultaneously open the sand storage tank 23 and the high-pressure water pump 22, use The water jet with sand cuts the main rib 8-1; the pressure sensor 7 is used to measure the reaction force of the water jet with sand, and when the reaction force suddenly decreases, it indicates that the main rib 8-1 has been cut (as shown in Figure 10), and it can be seen through the camera Confirm; after confirmation, use the same steps to cut the next main rib 8-1 until all the main ribs 8-1 are cut;

7) Secondary scanning of the inner cavity shape of the pile foundation: turn on the interferometer 6, control the driving motor I132 to drive the cutting area 14 to rotate for one revolution, and the control microcomputer 21 calculates the secondary inner cavity shape data through the interferometer 6, and the control The microcomputer 21 controls the driving motor II 142-14 according to the shape data of the secondary inner cavity, so that the distance between the nozzle 142-2 and the main rib 8-1 is equal;

8) Cutting the outermost layer of concrete 8-2: control the sand storage barrel 23 to stop sand production, adjust the high-pressure water pump 22 to increase the water pressure of the water jet and reduce the flow rate; the pressure sensor 7 will measure the reflection of the high-pressure water jet The force data is transmitted to the control microcomputer 21 in real time. When the reaction force in all directions changes from large to small and remains stable, the ultra-high pressure water pump 22, mud pump 151, drive motor Ⅰ 132 and drive motor Ⅱ 142-14 are turned off;

9) Recovery equipment: control the screw machine 161 in the bottom fixed area 16 to retract the screw and retract the construction part 1;

10) Pile extraction: fix the upper main reinforcement 8-1 on the pile extractor, and carry out traditional pile extraction construction.

If the pile body to be pulled out is longer and causes the pile side frictional resistance to be larger, after step 8, the screw machine 161 is controlled to take back the drill rod 162 and the construction part 1 is moved up a certain distance, and then the screw machine 161 is controlled to drill the drill rod 162 into the wall of the fixing hole to fix the bottom of the construction part 1, and then repeat steps 4 to 8 until the pile pulling construction is completed. The above-mentioned process can reduce the length of the pile body to be pulled out, thereby reducing the pulling-up force required for pulling out the pile.

In step 5, according to the different reaction forces of the high-pressure water jet sprayed on different media, the basis for confirming the main reinforcement 8-1 is: the reaction force of the water jet cutting the main reinforcement 8-1 with the same water pressure and flow rate is greater than the reaction force of cutting the concrete, cutting the concrete The force of the force is greater than the reaction force of the cutting soil, and the medium and the cutting progress of the cutting can be ascertained by the pressure sensor 7.

After the outermost layer of concrete 8-2 is cut in step 8, it will cause external pressurized water or submerged infiltration, and the pumping power of the mud pump 151 in step 6 should be greater than the pumping power of the mud pump 151 in

steps

4 and 5.

In step 8, adjust the ultra-high pressure water pump 22 to reduce the flow rate and increase the water pressure to make the cutting seam thinner. This approach prevents a large amount of soil from intruding into the construction area under the action of earth pressure due to excessive cutting joints, which will affect the work efficiency of the construction department 1.

The present invention utilizes the driving area 13 to realize the 360-degree rotation of the retractable nozzle 142-2, utilizes the interference range finder 6 to realize the function that the distance between the nozzle 142-2 and the inner cavity is equal, and uses the pressure sensor 7 and the camera 5 to realize positioning The purpose of the main reinforcement 8-1 and the completion of the cutting of the foundation pile is to use the screw machine 161 in the fixed area to realize that the construction department 1 can move upwards, and then realize the purpose of the multi-section cutting of the pile foundation to be pulled by the construction department 1, thereby improving the pile pulling efficiency , Reduce the cost of pulling piles, and weaken the impact of pile pulling construction on existing structures.

The above descriptions are only some preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims

A high-pressure water jet assisted pile extraction equipment, comprising a control unit (2) and a construction unit (1), characterized in that the control unit (2) comprises a control microcomputer (21), a high-pressure water pump (22) and a sand storage barrel (23), the construction part (1) is placed in the inner cavity of the pile foundation to be pulled out, the construction part (1) includes a protective cover (11), and ring-shaped Water storage chamber (12), driving area (13), cutting area (14), extraction area (15) and bottom fixing area (16);

The annular water storage chamber (12) and the high-pressure water pump (22) are connected through a water inlet pipe (3), and the water inlet pipe (3) is arranged on the top of the annular water storage chamber (12), and the annular water storage chamber (12 ) is provided with a circular slot (121); the drive zone (13) includes a hollow ring-shaped slider (131), drive motor I (132) and drive gear (133), the drive motor I ( The output shaft of 132) is fixedly connected with the drive gear (133), and the top of the annular slider (131) is provided with an annular groove (131-1), and the outer side is provided with sawtooth (131-2), and the annular The groove (131-1) is embedded in the circular slot (121), and the drive gear (133) is engaged with the sawtooth (131-2);

The cutting area (14) is fixedly connected with the bottom of the annular slider (131) through the connecting pipe (4), the cutting area (14) includes an annular cutting track (141) and a retractable nozzle pipe (142), and the flexible The telescopic nozzle (142) is embedded in the annular cutting track (141) along the radial direction, and the telescopic nozzle (142) is provided with a water pipe (143) and a sand inlet pipe (144), and the water pipe ( The two ends of 143) are respectively connected with the connecting pipe (4) and the sand inlet pipe (144), and the sand inlet pipe (144) is also connected with the sand storage barrel (23);

The extraction area (15) comprises a mud pump (151), and the mud pump (151) is connected to a suction pipe (152) and an outlet pipe (153), and the cut mud is sucked from the suction pipe (152) and passed through the outlet pipe ( 153) to the ground; the bottom fixing area (16) is used to fix the construction part (1) in the inner cavity of the pile foundation;

The control microcomputer (21) is respectively connected with the high-pressure water pump (22), the sand storage bucket (23), the drive motor I (132), the mud pump (151) and the retractable nozzle (142).
The high-pressure water jet assisted pile pulling equipment according to claim 1, wherein the telescopic nozzle (142) comprises a linear bearing (142-1) and a nozzle (142-2), and the nozzle (142- 2) It is connected with the inner ring of the linear bearing (142-11), and the inside of the tail end of the outer ring of the linear bearing (142-12) is provided with a bearing (142-13) and a driving motor II (142-14) in sequence, and the driving motor The output shaft of II (142-14) passes through the bearing (142-13) and the tail end of the inner ring of the linear bearing (142-11) is threaded, and the water pipe (143) and the sand inlet pipe (144) are located at the Inside the output shaft of Ⅱ(142-14);

The control microcomputer (21) is connected with the drive motor II (142-14).
The high-pressure water jet assisted pile pulling equipment according to claim 1, characterized in that a camera (5) is arranged outside the protective cover (11), and the control microcomputer (21) is connected to the camera (5).
The high-pressure water jet assisted pile pulling equipment according to claim 3, characterized in that, an interference range finder (6) is arranged outside the telescopic nozzle (142), and the control microcomputer (21) and the interference range finder (6) Connection.
The high-pressure water jet assisted pile pulling equipment according to claim 4, characterized in that a pressure sensor (7) is arranged around the telescopic nozzle (142), and the pressure sensor (7) is located on the circular cutting track (141) Outside, the control microcomputer (21) is also connected with the pressure sensor (7).
The high-pressure water jet assisted pile pulling equipment according to claim 1, characterized in that, the extraction area (15) also includes a water flush (154), and the water flush (154) is located below the suction pipe (152), The water flush (154) is connected with the high-pressure water pump (22).
The high-pressure water jet assisted pile extraction equipment according to claim 1, characterized in that, the bottom fixing area (16) includes a screw machine (161), and the screw machine (161) uses a drill rod (162) to place the construction part (1) It is fixed in the inner cavity of the pile foundation to be pulled out, and the control microcomputer (21) is connected with the screw machine (161).
A high-pressure water jet assisted pile extraction device according to any one of claims 1-7, characterized in that a plurality of said drive motors I (132) are symmetrically distributed.
A construction method for high-pressure water jet assisted pile extraction equipment according to any one of claims 1-8, characterized in that it comprises the following steps:

1) Build caps: Build caps above the piles to be pulled out, build columns above the caps, and connect the columns with the abutments, and reserve the position of the piles with pullouts under the caps;

2) Drilling and coring: Calculate the safe diameter of the inner cavity of the pile foundation according to the soil pressure at the cutting depth and the strength of the pile foundation concrete, and drill an inner cavity with a diameter smaller than the safe diameter in the pile foundation concrete area along the depth direction. The depth is greater than the target cutting depth, and a fixed hole is reserved in the center of the lumen;

3) Install high-pressure water jet auxiliary pile extraction equipment: put the construction part (1) into the inner cavity, control the camera to turn to the bottom of the inner cavity, so that the bottom fixing area (16) can be aligned with the fixing hole, and use the construction part (1) The self-weight of the bottom fixed area (16) is pressed into the fixed hole, and the protection steel pipe is adjusted to reach a vertical state; the operation of the screw machine (161) is controlled so that the drill rod (162) is drilled into the wall of the fixed hole, so that the construction part (1) Bottom fixed;

4) Scanning the shape of the inner cavity of the pile foundation: turn on the interferometer (6), control the drive motor I (132) to drive the cutting area (14) to rotate for one revolution, and control the microcomputer (21) to calculate the inner cavity through the interferometer (6). Cavity shape data, the control microcomputer (21) controls the driving motor II (142-14) according to the cavity shape data, so that the distance between the nozzle (142-2) and the cavity wall is equal;

5) Peel off the inner concrete and locate the position of the main reinforcement (8-1): turn on the high-pressure water pump (22) and the mud pump (151), and use the high-pressure water flow to peel off the inner concrete; the pressure sensor (7) will measure the pressure of the high-pressure water jet The reaction force data is transmitted to the control microcomputer (21) in real time, and the control microcomputer (21) adjusts the operation of the high-pressure water pump (22) in real time according to the reaction force data received; when the reaction force data becomes larger and then becomes smaller, locate this as the main rib (8-1), until the positions of all the main ribs (8-1) are located, stop spraying high pressure when the cutting area (14) rotates to the periphery of the determined position of the main ribs (8-1) in the process of confirming the main ribs (8-1) Water jet; when all the main ribs (8-1) are located, it can be further confirmed by the camera (5);

6) Cutting the main rib (8-1): Control the driving motor I (132) to drive the cutting area (14) according to the position information of the main rib (8-1), align the telescopic nozzle (142) with the main rib (8-1) , turn on the sand storage barrel (23) and high-pressure water pump (22) at the same time, use the water jet with sand to cut the main rib (8-1); use the pressure sensor (7) to measure the reaction force of the water jet with sand, when the reaction force suddenly decreases hour, it indicates that the main rib (8-1) has been cut, which can be confirmed by the camera; after confirmation, the next main rib (8-1) is cut with the same steps until all the main ribs (8-1) are cut;

7) The second scan of the inner cavity shape of the pile foundation: turn on the interferometer (6), control the driving motor I (132) to drive the cutting area (14) to rotate for one revolution, and control the microcomputer (21) to calculate through the interferometer (6) Output the secondary inner cavity shape data, the control microcomputer (21) controls the drive motor II (142-14) according to the secondary inner cavity shape data, so that the distance between the nozzle (142-2) and the main rib (8-1) is equal;

8) Cut the outermost layer of concrete: control the sand storage bucket (23) to stop sand production, adjust the high-pressure water pump (22), so that the water pressure of the water jet increases and the flow rate decreases; the pressure sensor (7) converts the measured high-pressure water The reaction force data of the jet is transmitted to the control microcomputer (21) in real time, and when the reaction force in all directions changes from large to small and remains stable, the ultra-high pressure water pump (22), mud pump (151), and drive motor I (132) are turned off And drive motor II (142-14);

9) Recovery equipment: control the screw machine (161) in the bottom fixed area (16) to retract the screw and retract the construction part (1);

10) Pile extraction: fix the upper main reinforcement (8-1) on the pile extractor, and carry out traditional pile extraction construction.
The construction method of a high-pressure water jet assisted pile pulling equipment according to claim 9, wherein if the pile body to be pulled is longer and the frictional resistance on the side of the pile is relatively large, after step 8, the screw machine ( 161) Take back the drill rod (162) and move the construction part (1) up for a certain distance; then control the screw machine (161) to drill the drill rod (162) into the wall of the fixing hole, so that the bottom of the construction part (1) is fixed, repeat the steps 4 to step 8, until the pile extraction construction is completed.