CN110485422B

CN110485422B - Pile pulling construction method of pile pulling device

Info

Publication number: CN110485422B
Application number: CN201910812221.1A
Authority: CN
Inventors: 尚贤菊; 庄光明; 尚俏佳
Original assignee: Zhejiang Yihe Geotechnical Engineering Co ltd
Current assignee: Zhejiang Wanjian Construction Co ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2021-04-13
Anticipated expiration: 2039-08-30
Also published as: CN110485422A

Abstract

The invention discloses a pile pulling device and a pile pulling construction method thereof, and the pile pulling device comprises a full sleeve connected with a power head of a combined power hole-forming pile machine, wherein the bottom end of the full sleeve is fixedly provided with a sleeve type pile pulling device, the sleeve type pile pulling device is provided with a plurality of groups of claws which are driven by an oil cylinder and can bulge towards the center of a pipe to form the waste pile, the claws axially support or cut off the waste pile at the bottom end of the waste pile, the inner surface of each claw is provided with a plurality of alloy teeth, and the oil cylinder is connected with an oil pump and an oil tank arranged on the combined power hole-forming; the bottom end of the sleeve type pile extractor is provided with a plurality of high-pressure water nozzles, and the high-pressure water nozzles are connected with a water pump which is arranged on the combined power pile forming machine and is connected with a water source through an electromagnetic valve and a high-pressure water pipe; the oil cylinder is also provided with a distance sensor for detecting the downward extension length of the piston rod, and the distance sensor is electrically connected with the controller. The convex column is accurate and reliable to the pocket bottom of the waste pile, construction noise is low, the waste pile is extracted after one-time rotation is extracted or cut off, time and labor are saved, construction period is short, and construction efficiency is high.

Description

Pile pulling construction method of pile pulling device

Technical Field

The invention relates to the technical field of waste pile cleaning, in particular to a pile pulling construction method of a pile pulling device.

Background

With the general popularization of urban extension and reconstruction projects and the rise of urban rail transit construction, the cleaning of waste piles left after the buildings are disassembled in the last century such as the eighth and the ninety years becomes a technical problem which needs to be faced by new high-rise buildings and urban rail transit. Two situations are generally faced: firstly, the waste pile is not more than 30 meters and can be pulled out at one time. And the other one is that the waste pile is as long as 60 meters, but meets the requirement of rail transit construction, and only the part of more than 30 meters is pulled out. The currently generally adopted method is to adopt destructive means such as hammering, rotary excavating or twisting off the old pile foundation and the like to clean the left hole after the old pile body is damaged, thereby wasting time and labor, having long construction period, low construction efficiency and large construction noise; or the whole sleeve is used for clamping the waste pile after penetrating into a certain depth by using a clamp with a spring control structure and the like, and then the waste pile is upwards pulled, but the clamping degree is difficult to control in actual operation, or the waste pile is clamped and broken to achieve the purpose of pulling out the whole waste pile, or the waste pile cannot be pulled out due to loose clamping; or the whole sleeve is utilized, a plurality of groups of cutting assemblies are arranged in the whole sleeve, the cutting assemblies are used for cutting the waste piles after the waste piles penetrate into a certain depth, and then the steel wire ropes of the crane are manually fixed on the upper section piles to lift the waste piles out of the ground. According to the knowledge of the applicant, at present, no ideal waste pile pulling device and method exist.

Disclosure of Invention

The invention aims to solve the technical problem of providing a pile pulling device capable of pulling out a whole waste pile at one time.

The invention provides a pile pulling device, which comprises a full sleeve connected with a power head of a combined power hole-forming pile machine, wherein a sleeve type pile pulling device is fixed at the bottom end of the full sleeve, a plurality of convex claws which are driven by an oil cylinder and can protrude towards the center of a pipe to form an axial upward support for the bottom end of a waste pile are arranged on the sleeve type pile pulling device, and the oil cylinder is connected with an oil pump and an oil tank arranged on the combined power hole-forming pile machine through an electromagnetic valve and oil pipes arranged in a sleeve of the pile pulling device and the full sleeve; the bottom end of the sleeve type pile extractor is provided with at least one high-pressure water spray head, and the high-pressure water spray head is connected with a water pump which is arranged on the combined power hole forming pile machine and is connected with a water source through an electromagnetic valve, high-pressure water pipes arranged in a sleeve pipe of the pile extractor and a full sleeve pipe; the oil cylinder is also provided with a distance sensor for detecting the downward extension length of the piston rod, and the distance sensor is electrically connected with a controller of the combined power hole forming pile machine through a lead arranged in the sleeve of the pile extractor and the full sleeve.

After adopting the structure, the pile pulling device has the following advantages: put the shortcoming of having overcome above prior art's pile pulling device, the rotatory in-process that sinks of bushing type pile extractor adopts high pressure water washing, after the predetermined degree of depth, reuse hydro-cylinder carries out axial support to old and useless stake on to be known as the pocket bottom or hold in the palm the bottom, if the controller is when not the pocket bottom according to distance sensor detection data determination, sink again until the pocket bottom, the projection is accurate, reliable to the support bottom of old and useless stake, the construction noise is little, can once only rotate and extract old and useless stake, time saving and labor saving, construction cycle is short, the efficiency of construction is high, provide an ideal pile pulling device for pulling out of old and useless stake in city extension transformation engineering and the city track traffic construction.

Furthermore, the four convex claws are uniformly arranged along the circumference of the sleeve type pile extractor. After the structure is adopted, the bottom supporting device formed by the four convex claws has better mechanical property and is more stable and reliable for supporting the bottom of the waste pile.

Furthermore, a plurality of alloy teeth capable of cutting off the waste pile when the convex claw protrudes towards the center of the pipe and is driven to rotate by the power head are arranged on the inner surface of the convex claw, and the bottom end of the waste pile comprises the bottom end of the cut waste pile. After the structure is adopted, under the condition that traffic track engineering only needs to pull out a section of waste pile such as a waste pile part more than 30 meters, the pile pulling device is adopted to cut off the waste pile and pull out the waste pile part more than 30 meters, the cutter abrasion is small, the working procedures are few, the operation of workers is simple, the construction efficiency is high, and the construction progress is fast.

Furthermore, the upper end of each oil cylinder is hinged to the upper end of the inner pipe wall and the outer pipe wall of the sleeve type pile extractor through a shaft, the lower end of a piston rod of each oil cylinder is hinged to the upper end of a first hinge arm, the lower end of the first hinge arm is hinged to the upper end of a second hinge arm, and the lower end of the second hinge arm is hinged to the lower end of the inner pipe wall and the outer pipe wall of the sleeve type pile extractor through a shaft; a plurality of notches for the first hinge arm and the second hinge arm to protrude towards the center of the pipe so as to axially support upwards or retract towards the pipe wall so as to return are formed in the inner pipe wall of the pipe-in-pipe pile extractor; the inner surfaces of the first hinge arm and the second hinge arm are provided with a plurality of alloy teeth; the oil cylinders drive the respective first hinge arms and the respective second hinge arms to protrude towards the center of the pipe through the respective piston rods, so that a plurality of convex claws which axially support and are symmetrical to the bottom end of the waste pile or the broken bottom end of the waste pile are formed. After the oil cylinder driven convex claw adopts the specific structure, the structure is simpler, the operation is more flexible, the cutter is less worn when needing to be cut off, the cutting is rapid and thorough, and the axial upward support of the waste pile is more stable and reliable.

Furthermore, after the first hinge arm and the second hinge arm are returned, the hinge arms are positioned in a space between the inner pipe wall and the outer pipe wall of the pipe pile extractor. After the structure is adopted, the sleeve type pile extractor rotationally sinks, namely, the bottom is not supported, and the waste pile is not cut off, so that the interference on the waste pile is avoided, the descending process of the sleeve type pile extractor is smoother, and the pile unloading is more convenient.

Furthermore, the distance sensor is a plurality of, and one on each hydro-cylinder is installed on the outer bottom end face of each hydro-cylinder, detects the distance change from the bottom end face of the distance sensor to the top face of the first articulated arm. After the structure is adopted, the detection result is more comprehensive and more accurate, and the distance sensor is more convenient to install and replace.

Furthermore, the high-pressure water nozzles are uniformly arranged along the circumference of the sleeve type pile extractor, and the nozzle of each high-pressure water nozzle faces outwards. After adopting above structure, the effect of high pressure impact earth grit is better.

The invention aims to solve another technical problem of providing a pile pulling construction method capable of pulling out a whole waste pile at one time.

Another technical solution of the present invention is to provide a method for pile pulling construction using any one of the above pile pulling apparatuses, including the steps of:

sleeving a sleeve type pile extractor at the lower end of a full sleeve outside a waste pile to be extracted;

secondly, starting the combined power hole-forming pile machine, operating the power head by the controller to enable the sleeve type pile extractor to rotate and sink, and simultaneously starting the high-pressure water spray head to flush the soil, gravels and the sand around the waste pile;

thirdly, when the heights of the plurality of convex claws are expected to be lower than the bottom end of the waste pile to be pulled, the plurality of oil cylinders are started to drive the piston rods to drive the plurality of convex claws to protrude towards the center of the pipe, meanwhile, the controller judges whether the plurality of convex claws protrude towards the center of the pipe in place according to the signals returned by the distance sensor,

if the plurality of convex claws do not protrude to the center of the pipe in place, the controller operates the plurality of oil cylinders to drive the piston rods to drive the plurality of convex claws to retract into a space between the inner pipe wall and the outer pipe wall of the sleeve type pile extractor, the controller operates the power head again to enable the sleeve type pile extractor to continuously rotate and sink, the high-pressure water spray head is used for flushing earth sand stones around the waste pile, and the above operations are repeated until the signal sent back by the distance sensor shows that the plurality of convex claws protrude to the center of the pipe in place;

if the plurality of convex claws are judged to be protruded to the center of the pipe in place, the controller operates the power head to rotate and pull the pile until the whole waste pile is lifted out of the ground; or

If the waste pile needs to be cut off, after the second step, the plurality of convex claws are sunk to the preset pile cutting position, the plurality of oil cylinders are started to drive the piston rods to drive the plurality of convex claws to protrude towards the center of the pipe, the power head rotates and cuts simultaneously, the controller judges whether the plurality of convex claws protrude towards the center of the pipe in place or not according to the signal returned by the distance sensor, namely whether the waste pile is cut off or not,

if the plurality of convex claws are judged not to be in place to protrude towards the center of the pipe, the controller operates the plurality of oil cylinders to drive the piston rods to drive the plurality of convex claws to continuously protrude towards the center of the pipe, the power head simultaneously rotates and cuts until the plurality of convex claws are judged to protrude towards the center of the pipe in place,

if the plurality of convex claws are raised to the center of the pipe in place, the controller operates the power head to rotate to pull the pile until the waste pile sleeved in the full casing pipe and the casing pipe pile extractor is integrally lifted out of the ground.

After the steps are adopted, the pile pulling construction method has the following advantages: the method of the invention overcomes the defects of the pile pulling method in the prior art, the sleeve type pile puller adopts high-pressure water washing in the rotary sinking process, after reaching the preset depth, the oil cylinder is used for supporting the waste pile axially by a plurality of convex columns, namely commonly called as a pocket bottom or a support bottom, and if the controller such as MCU determines that the pocket bottom is not formed according to the detection data of the distance sensor, the controller sinks again until reaching the pocket bottom. The convex column is accurate and reliable in supporting the bottom of the waste pile, construction noise is low, the waste pile can be pulled out in a one-time rotating mode, time and labor are saved, the construction period is short, and construction efficiency is high. Under the condition that traffic track engineering only needs to pull out a section of waste pile such as a waste pile part more than 30 meters, the pile pulling method is adopted to cut off the waste pile and pull out the waste pile part more than 30 meters, cutter abrasion is small, the number of working procedures is small, the operation of workers is simple, the construction efficiency is high, and the construction progress is fast. The ideal pile pulling construction method is provided for pulling out the waste piles in urban extension and reconstruction projects and urban rail transit construction.

Further, the pile pulling construction method further comprises the following steps: and fourthly, the full sleeve and the sleeve type pile extractor are transferred to a pile unloading position, the controller operates the oil cylinders to drive the piston rods to drive the convex claws to retract into a space between the inner pipe wall and the outer pipe wall of the sleeve type pile extractor, and at the moment, the waste piles sleeved in the full sleeve and the sleeve type pile extractor fall to the pile unloading position under the self gravity. After the steps are adopted, the waste piles lifted out of the ground can be properly stored or carried away by a large-sized vehicle, pile unloading is rapid and labor-saving, the waste piles are cleared more thoroughly, and construction efficiency is higher.

Drawings

FIG. 1 is a schematic structural diagram of a pile pulling device connected to a combined dynamic pore-forming device.

FIG. 2 is a schematic view of the present invention with the extractor post retracted (showing tubing and water lines and wires).

Fig. 3 is a schematic longitudinal sectional view of the pile extractor of fig. 2.

Fig. 4 is a schematic view of the construction of the pile extractor of the present invention with the post projecting towards the center of the tube (showing the high pressure water jet).

Fig. 5 is a schematic longitudinal sectional view of the pile extractor of fig. 4.

The pile pulling device comprises a sleeve type pile extractor 1, a sleeve type pile extractor 2, a power head 3, a sliding rail 4, a full sleeve pipe 5, a main mast 6, a chassis 7, an oil cylinder 8, a high-pressure water pipe 9, a lead wire 10, an oil pipe 11, a shaft 12, a distance sensor 13, a first articulated arm 14, a second articulated arm 15, a convex claw 16, a piston rod 17, a high-pressure water nozzle 18, a notch 19 and alloy teeth.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. It is to be noted that the description of the embodiments is provided to aid understanding of the present invention, and is not intended to limit the present invention. In addition, the technical features involved in the respective embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1, 2, 3, 4 and 5

The pile pulling device comprises a full sleeve 4 connected with a power head 2 of the combined power hole forming pile machine. The connection can adopt flange connection or the connection mode of the prior art such as quick joint connection. The combined power hole-forming pile machine, like the hydraulic walking type pile machine in the prior art, generally comprises a chassis 6, a main mast 5, a slide rail 3 and a power head 2 which is driven by a winch and a traction rope and can slide up and down on the slide rail 3. The combined power hole-forming pile machine is also called a rotary pile driver, and also can be called a rotary pile driver or a rotary pile extractor.

The bottom end of the full casing pipe 4 is fixed with a casing pipe pile extractor 1. The fixing can be in the fixing mode of the prior art such as welding, flange connection or quick joint connection. The sleeve type pile extractor 1 is provided with a plurality of convex claws 15 which are driven by an oil cylinder 7 and can protrude towards the center of a pipe to form an axial upper support at the bottom end of the waste pile or a cutting device which is described below, and the oil cylinder 7 is connected with an oil pump and an oil tank arranged on the combined power hole forming pile machine through an electromagnetic valve and an oil pipe 10 arranged in the sleeve of the pile extractor and the full sleeve 4. The claws 15 are preferably four, but of course three, five, six, seven and eight claws arranged uniformly along the circumference of the telescopic pile driver 1. The axial upward support can also be called as bottom holding of the bottom end of the waste pile, or called as bottom support, and can also be called as axial limiting.

The oil cylinder 7 is also provided with a distance sensor 12 for detecting the downward extension length of the piston rod 16. The distance sensor 12 is electrically connected with the controller of the combined dynamic hole forming pile machine through a lead 9 arranged in the pile extractor sleeve and the full sleeve 4. As is known in the art, a cylinder is typically two oil pipes. Because a plurality of oil cylinders, such as four oil cylinders, are preferably synchronous actions, a distance sensor can be arranged on only one oil cylinder. Of course, the invention preferably adopts a plurality of distance sensors 12, each oil cylinder is provided with one distance sensor 12, the stability and the reliability are stronger, and the detection result is more comprehensive and more accurate. The distance sensor 12 is preferably installed on an outer bottom end surface of each cylinder 7, and detects a distance change from a bottom end surface of the distance sensor 12 to a top surface of a first hinge arm 13 described below. Of course, the distance sensor 12 may also be installed on the inner top end plate of each cylinder 7 to detect the distance change from the bottom end surface of the distance sensor 12 to the piston of the cylinder, and the distance sensor 12 is installed inside the cylinder 7 and is relatively slightly affected by mud and water, but is troublesome to install and replace.

The upper end of each oil cylinder 7 is hinged with the upper end of the inner and outer pipe walls of the double pipe pile extractor 1 through a shaft 11, the lower end of a piston rod 16 of each oil cylinder 7 is hinged with the upper end of a first hinge arm 13, the lower end of the first hinge arm 13 is hinged with the upper end of a second hinge arm 14, and the lower end of the second hinge arm 14 is hinged with the lower end of the inner and outer pipe walls of the double pipe pile extractor 1 through the shaft 11. The above-mentioned hinge joint of each cylinder 7 and the first hinge arm 13 and the second hinge arm 14 may be the following specific structure: the upper end of each oil cylinder 7 is rotatably connected with the middle part of the shaft 11, and the two ends of the shaft 11 are respectively fixed and riveted on the upper ends of the inner pipe wall and the outer pipe wall of the sleeve pipe pile extractor 1. The through hole of the lower end sleeve of the piston rod 16 of each cylinder 7 is rotatably connected with the middle part of a shaft 11, and the two ends of the shaft 11 are respectively fixed, such as riveted, with the respective through holes at the upper ends of the two first hinge arms 13. The lower ends of the two first hinge arms 13 are respectively fixed to, e.g., riveted to, both ends of a shaft 11, and the middle portion of the shaft 11 is rotatably connected to the upper end of the second hinge arm 14. The lower end of the second hinge arm 14 is pivotally connected to the middle of a shaft 11, and the two ends of the shaft 11 are fixed, e.g. riveted, to the lower ends of the inner and outer pipe walls of the pipe pile driver 1, respectively.

The inner pipe wall of the pipe extension pile driver 1 is provided with a plurality of notches 18 for the first and second hinge

arms

13, 14 to project towards the centre of the pipe for axial jacking or to retract towards the pipe wall for return. In other words, the inner wall of the pipe extension type pile extractor 1 is provided with a plurality of, for example, four notches, for the respective first hinge arm 13 and the second hinge arm 14 to project toward the center of the pipe to axially support, i.e., axially limit the waste pile, or support the waste pile, or cut the waste pile, or retract toward the pipe wall to return. Of course, the notch 18 may also penetrate the bottom end of the inner pipe wall of the pipe pile extractor 1, or a notch may also be provided on the outer pipe wall of the pipe pile extractor 1, and the notch may also penetrate the bottom end of the outer pipe wall of the pipe pile extractor 1. After the first hinge arm 13 and the second hinge arm 14 are returned, the hinge arms are positioned in the space between the inner pipe wall and the outer pipe wall of the double pipe pile extractor 1. In other words, after return, all of the two articulated arms, including the teeth 19 described below, are located on the side of the casing pipe extractor 1 on the side of the plumb line of the inner wall of the inner pipe near the outer pipe wall. At this time, the axis of the piston rod 16 and the vertical center lines of the first hinge arm 13 and the second hinge arm 14 are generally on the same plumb line, which is certainly allowed when the two hinge arms are not on the same plumb line, but both hinge arms are located in the space between the inner pipe wall and the outer pipe wall of the telescopic pile extractor 1 after the telescopic pile extractor 1 is returned, that is, the vertical line of the inner wall of the telescopic pile extractor 1 is close to one side of the outer pipe wall, so as not to interfere the up-and-down movement of the telescopic pile extractor 1 along the waste pile. The first hinge arm 13 may also be referred to as a first hinge arm, and the second hinge arm 14 may also be referred to as a second hinge arm.

The inner surface of the jaw 15 is provided with a plurality of alloy teeth 19 capable of cutting the waste pile when the jaw 15 is protruded toward the center of the pipe and rotated by the power head 2, that is, the inner surfaces of the first hinge arm 13 and the second hinge arm 14 are provided with a plurality of alloy teeth 19, which is understood to mean the surface close to the center of the pipe. The alloy teeth 19 can be understood as picks, and can be square conical or conical. The bottom end of the waste pile comprises the bottom end of the cut waste pile. The oil cylinders 7 drive the respective first hinge arms 13 and second hinge arms 14 to protrude towards the center of the pipe through the respective piston rods 16, so that a plurality of convex claws 15 which axially support and are symmetrical to the bottom end of the waste pile or the bottom end of the broken waste pile are formed.

At least one high pressure water spray nozzle 17 is installed to 1 bottom of bushing type pile extractor, high pressure water spray nozzle 17 through the solenoid valve with locate pile extractor sleeve pipe and the full sheathed tube 4 in high pressure water pipe 8 with locate on the combination power pore-forming stake machine and be connected the water pump with the water source. The water source is provided with a water tank on the combined power hole forming pile machine or a water pool on the ground. It is understood that water pressure in the water pipe of more than 4 kg per square centimeter is generally called high-pressure water. The high-pressure water jet 17 may be a plurality of 4 as shown in the figure, which are uniformly arranged along the circumference of the pipe pile extractor 1, and preferably, the jet of each high-pressure water jet 17 faces outwards. Of course, the figure is only schematic, the number of the high-pressure water spray nozzles 17 can be any number of 5-16, the diameter and the shape of the high-pressure water spray nozzles 17 are also schematic in the figure, and the high-pressure water spray nozzles can also be large in diameter and other shapes.

The method for pile pulling construction by adopting the pile pulling device comprises the following steps:

firstly, the sleeve type pile extractor 1 at the lower end of the full sleeve 4 is sleeved outside the waste pile to be extracted.

And secondly, starting the combined power hole-forming pile machine, operating the power head 2 by the controller to enable the sleeve type pile extractor 1 to rotate and sink, and simultaneously starting the high-pressure water spray nozzles 17 to flush the soil, gravels and the sand around the waste pile.

And thirdly, if the height of the plurality of convex claws 15 is lower than the bottom end of the waste pile to be pulled down to 30 meters, starting the plurality of oil cylinders 7 to drive the piston rods 16 to drive the plurality of convex claws 15 to protrude towards the center of the pipe, and judging whether the plurality of convex claws 15 protrude towards the center of the pipe in place by the controller according to signals transmitted back by the distance sensor 12.

If the plurality of convex claws 15 are not protruded to the center of the pipe in place, the controller operates the plurality of oil cylinders 7 to drive the piston rods 16 to drive the plurality of convex claws 15 to retract into the pipe wall of the sleeve type pile extractor 1, namely, the space between the inner pipe wall and the outer pipe wall, and then the controller operates the power head 2 to enable the sleeve type pile extractor 1 to continuously rotate and sink and keep using the high-pressure water spray nozzles 17 to wash away the earth gravels around the waste pile; the above operation is repeated until the signal transmitted back by the distance sensor indicates that the plurality of claws 15 are raised to the position toward the center of the pipe.

If the plurality of convex claws 15 are raised to the center of the pipe in place, the controller operates the power head 2 to rotate and pull the pile until the waste pile sleeved in the full casing pipe 4 and the casing pipe type pile extractor 1 is integrally lifted out of the ground. The high-pressure water nozzle 17 can be opened or closed during pile pulling. Or

If the waste pile needs to be cut off, after the second step, the plurality of convex claws 15 are sunk to the preset pile cutting position, the plurality of oil cylinders 7 are started to drive the piston rods 16 to drive the plurality of convex claws 15 to protrude towards the center of the pipe, the power head simultaneously rotates for cutting, and the controller judges whether the plurality of convex claws 15 protrude towards the center of the pipe in place or not according to the signal returned by the distance sensor 12, namely whether the waste pile is cut off or not.

If the plurality of the convex claws 15 are judged not to be in place to protrude towards the center of the pipe, namely the waste pile is judged not to be cut off, the controller operates the plurality of the oil cylinders 7 to drive the piston rods 16 to drive the plurality of the convex claws 15 to continuously protrude towards the center of the pipe, the power head simultaneously rotates and cuts until the plurality of the convex claws 15 are judged to protrude towards the center of the pipe in place, namely, until the signals returned by the distance sensor 12 are judged that the plurality of the convex claws 15 protrude towards the center of the pipe in place through the controller.

If the plurality of convex claws 15 are raised to the center of the pipe in place, the controller operates the power head 2 to rotate and pull the pile until the waste pile sleeved in the full casing pipe 4 and the casing pipe type pile extractor 1, namely the cut waste pile of the upper section, is lifted out of the ground integrally.

And fourthly, the full sleeve 4 and the sleeve type pile extractor 1 are transferred to a pile unloading position such as a large trailer, the controller operates the oil cylinders 7 to drive the piston rods 16 to drive the convex claws 15 to retract into a space between the inner pipe wall and the outer pipe wall of the sleeve type pile extractor 1, and at the moment, the waste pile sleeved in the full sleeve 4 and the sleeve type pile extractor 1 falls on the pile unloading position such as the large trailer under the self gravity and is dragged away from the construction site.

Naturally, the pile-pulling construction method of the present invention may further include a fifth step of backfilling soil in the left hole from which the waste pile is pulled out.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a pile pulling construction method of pile pulling device, pile pulling device include with make up full sleeve pipe (4) that power head (2) of power hole-forming stake machine are connected, its characterized in that: the bottom end of the full sleeve (4) is fixed with a sleeve type pile extractor (1), the sleeve type pile extractor (1) is provided with a plurality of convex claws (15) which are driven by an oil cylinder (7) and can protrude towards the center of a pipe to form an axial upward support for the bottom end of the waste pile, and the oil cylinder (7) is connected with an oil pump and an oil tank arranged on the combined power hole-forming pile machine through an electromagnetic valve and an oil pipe (10) arranged in the sleeve of the pile extractor and the full sleeve (4); the bottom end of the sleeve type pile extractor (1) is provided with at least one high-pressure water spray head (17), and the high-pressure water spray head (17) is connected with a water pump which is arranged on the combined power pile forming machine and is connected with a water source through an electromagnetic valve and a high-pressure water pipe (8) arranged in the sleeve of the pile extractor and the whole sleeve (4); the oil cylinder (7) is also provided with a distance sensor (12) for detecting the downward extension length of the piston rod (16), and the distance sensor (12) is electrically connected with a controller of the combined power hole forming pile machine through a lead (9) arranged in the pile extractor sleeve and the full sleeve (4);

the inner surface of the convex claw (15) is provided with a plurality of alloy teeth (19) which can cut off the waste pile when the convex claw (15) protrudes towards the center of the pipe and is driven to rotate by the power head (2), and the bottom end of the waste pile comprises the bottom end of the cut waste pile;

the pile pulling construction method of the pile pulling device comprises the following steps:

firstly, sleeving a sleeve type pile extractor (1) at the lower end of a full sleeve (4) outside a waste pile to be extracted;

secondly, starting the combined power hole-forming pile machine, operating the power head (2) by the controller to enable the sleeve type pile extractor (1) to rotate and sink, and simultaneously starting the high-pressure water nozzle (17) to flush the soil, gravels and stones around the waste pile;

thirdly, when the heights of the plurality of convex claws (15) are expected to be lower than the bottom end of the waste pile to be pulled, the plurality of oil cylinders (7) are started simultaneously to drive the piston rods (16) to drive the plurality of convex claws (15) to bulge towards the center of the pipe, meanwhile, the controller judges whether the plurality of convex claws (15) bulge in place towards the center of the pipe according to signals returned by the distance sensor (12),

if the plurality of the convex claws (15) do not protrude to the center of the pipe in place, the controller operates the plurality of the oil cylinders (7) to drive the piston rods (16) to drive the plurality of the convex claws (15) to retract into a space between the inner pipe wall and the outer pipe wall of the sleeve-type pile extractor (1), then the controller operates the power head (2) to enable the sleeve-type pile extractor (1) to continuously rotate and sink, and a high-pressure water nozzle (17) is used for flushing earth and gravel around the pile, and the above operations are repeated until a signal sent back by the distance sensor (12) shows that the plurality of the convex claws (15) protrude to the center of the pipe in place;

if the plurality of convex claws (15) are raised to the center of the pipe in place, the controller operates the power head (2) to rotate and pull the pile until the whole waste pile sleeved in the full casing pipe (4) and the casing pipe pile extractor (1) is lifted out of the ground; or

If the waste pile needs to be cut off, after the second step, the plurality of convex claws (15) are sunk to the preset pile cutting position, the plurality of oil cylinders (7) are started to drive the piston rods (16) to drive the plurality of convex claws (15) to bulge towards the center of the pipe, the power head rotates and cuts simultaneously, the controller judges whether the plurality of convex claws (15) bulge towards the center of the pipe in place or not according to the signal returned by the distance sensor (12), namely whether the waste pile is cut off or not,

if the plurality of the convex claws (15) are judged not to be in place to bulge towards the center of the pipe, the controller operates the plurality of the oil cylinders (7) to drive the piston rods (16) to drive the plurality of the convex claws (15) to continue to bulge towards the center of the pipe, the power head rotates and cuts simultaneously until the plurality of the convex claws (15) are judged to bulge towards the center of the pipe in place,

if the plurality of the convex claws (15) are raised to the center of the pipe in place, the controller operates the power head (2) to rotate and pull the pile until the waste pile sleeved in the full casing pipe (4) and the casing pipe pile extractor (1) is integrally lifted out of the ground.

2. The pile pulling construction method of a pile pulling apparatus according to claim 1, characterized in that: the number of the convex claws (15) is four which are uniformly arranged along the circumference of the sleeve type pile extractor (1).

3. The pile pulling construction method of a pile pulling apparatus according to claim 1, characterized in that: the upper end of each oil cylinder (7) is hinged to the upper end of the inner pipe wall and the outer pipe wall of the sleeve type pile extractor (1) through a shaft (11), the lower end of a piston rod (16) of each oil cylinder (7) is hinged to the upper end of a first hinge arm (13), the lower end of the first hinge arm (13) is hinged to the upper end of a second hinge arm (14), and the lower end of the second hinge arm (14) is hinged to the lower end of the inner pipe wall and the outer pipe wall of the sleeve type pile extractor (1) through the shaft (11); a plurality of notches (18) for the first articulated arm (13) and the second articulated arm (14) to protrude towards the center of the pipe so as to axially support upwards or retract towards the pipe wall for returning are arranged on the inner pipe wall of the pipe-in-pipe pile extractor (1); the inner surfaces of the first hinge arm (13) and the second hinge arm (14) are provided with a plurality of alloy teeth (19); the oil cylinders (7) drive the respective first hinge arms (13) and second hinge arms (14) to protrude towards the center of the pipe through the respective piston rods (16), so that a plurality of convex claws (15) which are axially supported and symmetrical on the bottom end of the waste pile or the broken bottom end of the waste pile are formed.

4. The pile pulling construction method of the pile pulling apparatus according to claim 3, characterized in that: after the first hinge arm (13) and the second hinge arm (14) return, the hinge arms are both positioned in a space between the inner pipe wall and the outer pipe wall of the sleeve type pile extractor (1).

5. The pile pulling construction method of a pile pulling apparatus according to claim 1, characterized in that: the distance sensors (12) are multiple, one distance sensor is arranged on each oil cylinder (7), and the distance sensors are arranged on the outer bottom end face of each oil cylinder (7) and used for detecting the distance change from the bottom end face of each distance sensor (12) to the top face of the first hinged arm (13).

6. The pile pulling construction method of a pile pulling apparatus according to claim 1, characterized in that: the high-pressure water spray heads (17) are uniformly arranged along the circumference of the sleeve type pile extractor (1), and the spray opening of each high-pressure water spray head (17) faces outwards.

7. The pile pulling construction method of a pile pulling apparatus according to claim 1, further comprising the steps of:

and fourthly, the full sleeve (4) and the sleeve type pile extractor (1) are rotated to a pile unloading position, the controller operates the oil cylinders (7) to drive the piston rods (16) to drive the convex claws (15) to retract into a space between the inner pipe wall and the outer pipe wall of the sleeve type pile extractor (1), and at the moment, the waste piles sleeved in the full sleeve (4) and the sleeve type pile extractor (1) fall to the pile unloading position under the self gravity.