Pile pulling device

Abstract

The invention relates to the technical field of building construction, in particular to a pile pulling device. Comprising a ground breaking module and an extension frame detachably arranged at the tail end of the ground breaking module. The holding units are detachably arranged on the extension frame, and the multiple sets of holding units are arranged in the long edge direction of the extension frame at equal intervals and used for conducting real-time protection correction on the square pile in the pile pulling process; the soil breaking device is characterized in that the soil breaking module is further provided with a cutting frame capable of cutting off soil on the periphery of the square pile in the circumferential direction and a breaking part capable of assisting the cutting frame in rapidly cutting off the soil; when pressure is applied to the extension frame, the crushing part cooperates with the cutting frame to rapidly cut off soil in the circumferential direction of the edge of the square pile, and hard objects can be rapidly crushed through the crushing part when encountering the hard objects. The pile pulling-out device is simple in structure and small in occupied area, and a pile body can be efficiently and rapidly pulled out.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a pile pulling device. Background Art

[0002] At present, pile foundations are widely used in construction and infrastructure engineering, especially in the foundation treatment of buildings such as bridges and houses, where pile foundations can provide a stable supporting structure. However, when construction projects require the reconstruction or maintenance of old buildings, pile extraction becomes an important and necessary task.

[0003] Existing pile pulling methods usually rely on mechanical or hydraulic equipment, such as static pile pullers and full-rotation drilling rig pile pullers; static pile pullers use the principle of static pressure to overcome the pressure between the precast pile and the surrounding soil by continuous and uniform pressure to pull out the precast pile; full-rotation drilling rig pile pullers use the steel sleeve of the machine body to rotate and sink to a predetermined depth, so that the friction between the pile body and the soil is pulled out, thereby pulling out the precast pile; however, when using static pile pullers and full-rotation drilling rig pile pullers to pull out the pile body, the following problems will occur respectively: static pile pullers occupy a large area, have a slow pile pulling speed, and the whole pile The success rate of complete extraction is low; the full-rotation drilling rig cannot remove the longer part of the pile body in one go, and a hammer is needed to break the pile body. If the hammer still cannot meet the requirements, a special steel wedge is needed to drive the prefabricated pile to eccentrically rotate, thereby removing the pile body; there are technical problems such as the pile extraction process is difficult to control, low efficiency, and complicated operation; in addition, due to the complexity of the soil environment, there may be mud or other obstacles around the pile foundation, and the traditional pile extraction device may be stuck during the pile extraction process, increasing the number and time of pile extraction, and even causing damage to the equipment. Summary of the invention

[0004] In view of the above problems, a pile pulling device is provided. By proposing a device with a simple structure and small footprint and capable of pulling out a pile efficiently and conveniently, the technical problems that the existing pile pulling equipment has complex construction steps, large footprint, low pile pulling efficiency and easy deformation of the pile body when pulling out the pile body are solved.

[0005] In order to solve the problems of the prior art, the present invention provides a pile pulling device, comprising a ground-breaking module and an extension frame detachably arranged at the end of the ground-breaking module; a clamping unit is detachably arranged on the extension frame and a plurality of clamping units are equidistantly arranged along the long side direction of the extension frame, so as to perform real-time protection and correction on the square piles during the pile pulling process; it is characterized in that the ground-breaking module is also provided with a cutting frame capable of circumferentially cutting off the soil around the square piles and a crushing part capable of assisting the cutting frame to quickly cut off the soil; when pressure is applied to the extension frame, the crushing part cooperates with the cutting frame to quickly cut off the soil around the edge of the square pile, and can use the crushing part to quickly crush the hard objects when encountering hard objects.

[0006] Preferably, the cutting frame is a hollow rectangular frame with openings at both ends, and the rectangular frame is welded by multiple groups of steel plates; a connecting part is further arranged at the front end of the cutting frame; the crushing part is vertically welded on the surface of the connecting part and is arranged close to the edge of the connecting part; multiple groups of the crushing parts are arranged circumferentially along the edge of the connecting part.

[0007] Preferably, the crushing part is composed of a conical head and a cemented carbide embedded at the conical head.

[0008] Preferably, a slicing plate capable of slicing soil is also vertically arranged on the surface of the connecting part; multiple groups of slicing plates are arranged, and the multiple groups of slicing plates are spaced between multiple groups of crushing parts for further slicing the soil.

[0009] Preferably, the soil-breaking module and the extension frame are connected by a quick-release unit; the quick-release unit is composed of a quick plug fixedly arranged at the end of the soil-breaking module and a quick socket fixedly arranged at the front end of the extension frame.

[0010] Preferably, the extension frame is a first U-shaped frame arranged in a long strip shape, and the outer surface of the first U-shaped frame is flush with the outer surface of one side of the cutting frame; it is used to guide the cutting frame to continuously penetrate deep into the ground.

[0011] Preferably, curling edges through which a water pipe can pass are further arranged on both sides in the long side direction of the extension frame; the curling edges are used to transmit the water source towards the soil-breaking module direction to soften the soil.

[0012] Preferably, the clamping unit is a second U-shaped frame arranged in a long strip shape, and the second U-shaped frame covers the opening of the extension frame and encloses a rectangular cavity with the extension frame for limiting the square pile, so as to intermittently clamp the square pile; the outer surface of the second U-shaped frame is flush with the outer surface of the other side of the cutting frame.

[0013] Preferably, a first inclined surface and a second inclined surface are respectively arranged at both ends of the second U-shaped frame.

[0014] Preferably, an arc-shaped limiting frame capable of performing one-way limiting on the square pile is detachably arranged inside the cutting frame.

[0015] The beneficial effects of the present invention compared with the prior art are as follows:

[0016] 1. The present invention ensures the one-way limiting function of the square pile during the pulling-out process through the arrangement of the arc-shaped limiting frame, avoids the lateral displacement or reverse movement of the pile body during operation, and enhances the stability and safety of the operation; the arc-shaped limiting frame can automatically fold when contacting the square pile, adapts to different pile body sizes, and ensures the versatility and high-efficiency operation of the equipment.

[0017] 2. The present invention can efficiently cut off the soil around the square pile through the coordinated action of the cutting frame and the crushing part in the earth-breaking module, and quickly crush the soil through the crushing part when encountering hard objects; this function ensures that the equipment can adapt to different soil types and complex terrains, and further improves the extraction speed and success rate of the pile body.

[0018] 3. The present invention provides a channel for the water supply pipe through the curling design on both sides of the extension frame, and loosens the soil by injecting water, which greatly reduces the difficulty of pressing down when breaking the soil, so that the equipment can still operate efficiently in relatively dry or hard soil, thereby extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional pile pulling device. Figure 1 .

[0020] Figure 2 It is a three-dimensional pile pulling device. Figure 2 .

[0021] Figure 3 It is a side view of a pile pulling device.

[0022] Figure 4 The utility model is an exploded stereoscopic diagram of a pile pulling device.

[0023] Figure 5 yes Figure 4 A partial enlarged view of point A.

[0024] Figure 6 It is a pile pulling device that removes the extension frame and the clamping unit. Figure 1 .

[0025] Figure 7 It is a pile pulling device that removes the extension frame and the clamping unit. Figure 2 .

[0026] Figure 8 It is a pile pulling device that removes the extension frame and the clamping unit. Figure 3 .

[0027] The numbers in the figure are:

[0028] 1- ground breaking module; 11- cutting frame; 111- connecting part; 112- arc limit frame; 113- cutting plate; 12- crushing part; 121- cone head; 122- hard alloy;

[0029] 2- extension frame; 21- curling edge;

[0030] 3-holding unit; 31-second shaped frame; 32-first inclined plane; 32-second inclined plane;

[0031] 4- quick release unit; 41- quick plug; 42- quick socket. DETAILED DESCRIPTION

[0032] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] See also Figures 1 to 8 As shown: a pile pulling device, comprising a ground-breaking module 1 and an extension frame 2 detachably arranged at the end of the ground-breaking module 1; a clamping unit 3 is detachably arranged on the extension frame 2 and a plurality of clamping units 3 are equidistantly arranged along the long side direction of the extension frame 2, so as to perform real-time protection and correction on the square piles during the pile pulling process; it is characterized in that the ground-breaking module 1 is also provided with a cutting frame 11 capable of circumferentially cutting off the soil around the square piles and a crushing part 12 capable of assisting the cutting frame 11 to quickly cut off the soil; when pressure is applied to the extension frame 2, the crushing part 12 cooperates with the cutting frame 11 to quickly cut off the soil around the edge of the square pile, and can use the crushing part 12 to quickly crush the hard objects when encountering hard objects.

[0034] When it is necessary to use the device to pull out the square pile, firstly, accurate measurement and positioning are carried out before construction to ensure that the device is correctly aligned with the square pile; then, the earth-breaking module 1 and the extension frame 2 are spliced ​​to achieve a reliable connection between the two; the device is erected by external lifting or pressure equipment, adjusted to the correct posture, and the earth-breaking module 1 is centrally sleeved on the outside of the square pile to be pulled out; at this time, pressure is applied to the extension frame 2, so that the front end of the earth-breaking module 1 is inserted into the soil, and the soil around the square pile is gradually cut off, and with further pressure, the earth-breaking module 1 and the extension frame 2 are completely pressed into the ground, so as to achieve the purpose of longitudinally cutting the soil around the square pile;

[0035] During the entire downward pressing process, the crushing part 12 at the front end of the earth-breaking module 1 cooperates with the cutting frame to not only quickly cut off the soil around the square pile, but also effectively deal with the hard obstacles underground, and use the crushing part 12 to crush them, so as to ensure that the earth-breaking module 1 is smoothly pressed into the soil; when the soil around the square pile is cut, the square pile is tied with a hinge or a sling, and slowly pulled up to pull it out; if the square pile is long, it can be pulled out in sections, and the square pile can be pulled out to a certain height and then cut, and then pulled out section by section until the square pile is completely removed; after the square pile is pulled out, the earth-breaking module 1 and the extension frame 2 are pulled out from the ground to complete the entire pile pulling process;

[0036] The combination of the earth-breaking module 1 and the extension frame 2 ensures that the soil around the square pile can be accurately cut during the pile extraction process, and the crushing part 12 breaks hard objects to ensure the smooth pressing down and pile extraction operation of the device; in addition, the modular design facilitates the adjustment of the square pile extraction method, especially when long piles are extracted, a segmented extraction method is adopted, which effectively improves the construction efficiency and safety.

[0037] See also Figure 3 and Figure 4 As shown in the figure: the cutting frame 11 is a hollow rectangular frame with two ends opened, and the rectangular frame is welded by multiple groups of steel plates; the front end of the cutting frame 11 is also provided with a connecting portion 111; the crushing portion 12 is vertically welded and arranged on the surface of the connecting portion 111 and is arranged close to the edge of the connecting portion 111; the crushing portion 12 is arranged in multiple groups along the circumferential direction of the edge of the connecting portion 111.

[0038] The cutting frame 11 is composed of a plurality of welded steel plates; this design enhances the overall strength of the cutting frame 11 and ensures that it can maintain stability under high-pressure operation; in addition, the connecting portion 111 provided at the front end of the cutting frame 11 is used to achieve a stable connection with the crushing portion 12; the crushing portion 12 vertically welded at the edge of the connecting portion 111 is used to effectively crush hard objects encountered during the extraction of the square piles; this structure enables the cutting frame 11 to work in coordination in soil cutting and hard object crushing, avoiding obstacles that affect the smooth progress of cutting and pile extraction; and significantly improves construction efficiency.

[0039] See also Figure 6 As shown, the crushing part 12 is composed of a cone head 121 and a hard alloy 122 embedded in the cone head 121 .

[0040] The cemented carbide 122 is specifically tungsten steel, but may also be other materials, not limited to tungsten steel;

[0041] The design of the cone head 121 can provide concentrated and effective crushing force during the pressure application of the pile pulling device, and quickly cut into and crush the hard obstacles encountered; the high hardness and wear resistance of the cemented carbide 122 ensure that the crushing part 12 can still maintain a good working condition under long-term high-intensity operation and is not easily worn or damaged; the service life and working efficiency of the crushing part 12 are enhanced, and it is particularly suitable for efficient crushing when encountering hard soil or rock during the pile pulling process; the combination of the cone head 121 and the cemented carbide 122 ensures that a strong cutting and crushing ability can be maintained under different geological conditions.

[0042] See also Figure 7 As shown: the surface of the connecting portion 111 is also vertically provided with a cutting plate 113 capable of cutting the soil; the cutting plates 113 are provided in multiple groups, and the multiple groups of cutting plates 113 are spaced between the multiple groups of crushing parts 12 to further cut the soil.

[0043] The splitting plate 113 is designed as a triangular strip plate with its tip facing the ground directly. During the pressing process, this tip will come into contact with the ground first. And because the splitting plate 113 is triangular in design, when the splitting plate 113 makes intermittent contact with the ground, a smoother cutting-in effect can be achieved, reducing the total pressure required during the pressing process. The triangular structure makes the cutting-in process more efficient, especially in complex soil or harder soil layer environments, and can maintain a smooth working efficiency.

[0044] Furthermore, the length of the splitting plate 113 is shorter than that of the crushing part 12, ensuring that when encountering hard objects, the crushing part 12 will come into contact with the hard objects first. It can effectively prevent the hard objects from damaging the tip of the splitting plate 113, thus ensuring that the splitting plate 113 can continue to maintain a good cutting effect in subsequent operations and not affecting the overall working performance of the equipment.

[0045] See Figure 5 As shown: The破土 module 1 and the extension frame 2 are connected by a quick-release unit 4. The quick-release unit 4 is composed of a quick plug 41 fixedly arranged at the end of the破土 module 1 and a quick socket 42 fixedly arranged at the front end of the extension frame 2.

[0046] The quick-release unit 4 is a prior art and will not be elaborated here. In order to further achieve the connection effect between the破土 module 1 and the extension frame 2, welding connection can also be used.

[0047] Connecting the破土 module 1 and the extension frame 2 through the quick-release unit 4 not only simplifies the installation and disassembly process but also improves the flexibility of the device. Specifically, the quick-release unit 4 is composed of a quick plug 41 fixedly arranged at the end of the破土 module 1 and a quick socket 42 fixedly arranged at the front end of the extension frame 2. During use, the破土 module 1 can be quickly connected or separated from the extension frame 2 only through simple plugging and unplugging operations, greatly improving the construction efficiency, especially in cases where frequent replacement or maintenance is required, which is more convenient.

[0048] The quick-release unit 4 can achieve rapid module disassembly and assembly, saving construction preparation time and reducing the labor intensity of workers. At the same time, the connection method is stable, ensuring that the破土 module 1 and the extension frame 2 will not loosen or fall off during operation, guaranteeing the safety and stability of the equipment.

[0049] See Figure 4 As shown: The extension frame 2 is a first C-shaped frame arranged in a long strip shape, and the outer surface of this first C-shaped frame is flush with the outer surface of one side of the cutting frame 11, used to guide the cutting frame 11 to continuously penetrate deeper underground.

[0050] The first C-shaped frame is not only used to continuously press on the cutting frame 11, but also can continuously guide and correct the cutting frame 11 during the downward pressing process; by setting the outer surface of the first C-shaped frame flush with the outer surface of one side of the cutting frame 11, it effectively ensures a smooth transition between the cutting frame 11 and the extension frame 2 during the pressing process; the advantage of this design is that it can reduce the resistance during operation, avoid jamming caused by imbalance or poor connection, and ensure that the device can smoothly cut and remove the soil around the square pile;

[0051] In addition, this design also prevents the extension frame 2 from exceeding the maximum cutting range of the cutting frame 11 when continuously penetrating deep into the ground, avoiding additional downward resistance problems caused by uneven pressing or exceeding the design load; the structural characteristics of the first C-shaped frame also provide good guidance and support, ensuring that the cutting frame 11 maintains a stable posture during pressing and sinking, thereby reducing the shaking or deviation of the equipment during operation.

[0052] Through the guiding and supporting design of the first C-shaped frame, the present invention realizes a seamless transition between the cutting frame 11 and the extension frame 2, greatly reducing the resistance during operation and improving the operation efficiency of the equipment; at the same time, the first C-shaped frame effectively prevents offset and shaking during the cutting process, ensuring the stability and accuracy of the equipment during high-pressure operation.

[0053] See Figure 3 As shown: On both sides of the long side direction of the extension frame 2, there are also flanges 21 through which the water pipe can pass; the flanges 21 are used to transmit the water source towards the breaking soil module 1 direction and soften the soil.

[0054] By providing the flanges 21 through which the water pipe passes, it is mainly to use the water supply system to inject water into the soil during the soil breaking process to soften the soil, thereby reducing the resistance of the extension frame 2 during the downward pressing process; this water supply auxiliary system is particularly suitable for relatively hard or dry soil environments. The water source is smoothly transmitted to the periphery of the breaking soil module 1 through the flanges 21, which helps to improve the softness of the soil and makes the cutting and soil breaking operations smoother; by combining the design of the flanges 21 with the water supply system, it not only ensures the normal operation of the equipment, but also greatly reduces the downward pressing difficulty of the extension frame 2 in the soil; at the same time, this design can also effectively reduce the wear of the breaking soil module 1 and the load of the extension frame 2, thereby extending the service life of the equipment.

[0055] See Figure 4 As shown: The clamping unit 3 is a second C-shaped frame 31 arranged in a long strip shape. The second C-shaped frame 31 is covered at the opening of the extension frame 2 and encloses a rectangular cavity with the extension frame 2 to limit the square pile, and is used to intermittently clamp the square pile; the outer surface of the second C-shaped frame 31 is flush with the outer surface of the other side of the cutting frame 11.

[0056] Through the enclosure of the second C-shaped frame 31, the position of the square pile can be effectively restricted, preventing the square pile from shifting or deviating during the operation; by setting the outer surface of the second C-shaped frame 31 flush with the outer surface on the other side of the cutting frame 11, it ensures the smooth connection of each component during the operation, avoiding an increase in resistance caused by misalignment or dislocation of the structure, thereby improving the working efficiency and stability of the overall device; the clamping unit 3 can provide intermittent clamping and limiting functions at different stages of pulling out the square pile, ensuring that the square pile always remains in the predetermined position during the continuous pile pulling process, avoiding the shaking or deviation of the pile body; in addition, this structural design also ensures the stability and safety of the pile pulling device during operation;

[0057] Through the enclosure design of the second C-shaped frame 31 and the extension frame 2, the clamping unit 3 can effectively restrict the position of the square pile and provide an intermittent clamping effect during the pile pulling process to prevent the square pile from shifting; the flush setting of the second C-shaped frame 31 ensures the smoothness of the operation process, reduces the resistance, and further improves the stability and pile pulling efficiency of the device; it provides a strong guarantee for the position control of the square pile and the operation stability of the equipment during the operation process.

[0058] See Figure 4 As shown: First inclined surfaces 32 and second inclined surfaces 32 are respectively formed at both ends of the second C-shaped frame 31.

[0059] By respectively forming the first inclined surface 32 and the second inclined surface 32 at both ends of the second C-shaped frame 31, a smoother soil cutting effect can be provided during the pile pulling process; when the破土 module 1 is inserted into the ground, even when the second C-shaped frame 31 contacts the soil, the design of the first inclined surface 32 helps to reduce the resistance, enabling the equipment to more easily enter the ground during the downward pressing process. Especially in relatively hard or complex soil layers, the first inclined surface 32 can effectively disperse the reaction force from the soil, avoiding jamming or excessive wear of the device during the downward pressing process; in addition, the presence of the first inclined surface 32 and the second inclined surface 32 can further guide the cutting direction of the破土 module 1, ensuring that the破土 module 1 and the extension frame 2 can smoothly enter the ground, while reducing equipment damage or failures caused by hard objects or obstacles; the first inclined surface 32 and the second inclined surface 32 formed at both ends of the second C-shaped frame 31 enable the second C-shaped frame 31 not only to have the cutting ability but also to significantly reduce the equipment loss during the operation and improve the working efficiency of the破土 module 1.

[0060] See Figure 6 As shown: An arc-shaped limiting frame 112 capable of unidirectionally limiting the square pile is also detachably arranged inside the cutting frame 11.

[0061] The arc-shaped limit frame 112 is arranged obliquely toward the extension frame 2, which can effectively realize the limit control of the square pile during the installation and extraction of the pile body; when the cutting frame 11 is sleeved outside the square pile, the arc-shaped part of the limit frame first contacts the outer arc surface of the square pile; at this time, the arc-shaped limit frame 112 will be pressed toward the inside of the cutting frame 11 along the moving direction of the square pile, thereby ensuring that the square pile can only move toward the extension frame 2 during operation, avoiding unnecessary lateral displacement or loosening of the pile body when it is not extracted;

[0062] During the pile pulling operation, when the cutting frame 11 and the extension frame 2 need to be pulled out together with the square pile, the distal end of the arc-shaped limit frame 112 will provide a limit resistance to the square pile; this design provides a one-way limit to ensure that the square pile will not move in the opposite direction when being pulled out upward, thereby assisting the square pile to be pulled out of the ground smoothly and stably; the inclined arc-shaped limit frame 112 can effectively control the one-way movement of the pile body, ensuring that the pile body will not be lateral displacement or reverse movement during the pile pulling process; and the limit frame automatically adapts to the shape of the square pile when being folded, thereby improving the operational flexibility and stability of the pile pulling device.

[0063] The present invention has not only a simple structure and a small footprint, but can also realize efficient and quick pulling out of the pile body.

[0064] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A pile pulling device, comprising a ground-breaking module (1) and an extension frame (2) detachably arranged at the end of the ground-breaking module (1); a clamping unit (3) detachably arranged on the extension frame (2) and a plurality of clamping units (3) equidistantly arranged along the long side direction of the extension frame (2), for performing real-time protection and correction on the other pile during the pile pulling process; characterized in that: The soil-breaking module (1) is further provided with a cutting frame (11) capable of circumferentially cutting the soil around the square pile and a crushing part (12) capable of assisting the cutting frame (11) to quickly cut the soil; when pressure is applied to the extension frame (2), the crushing part (12) and the cutting frame (11) can quickly cut the soil circumferentially at the edge of the square pile and can quickly crush hard objects with the crushing part (12) when encountering hard objects.

2. A pile pulling device according to claim 1, characterized in that: The cutting frame (11) is a rectangular frame that is hollow and open at both ends, and the rectangular frame is formed by welding multiple groups of steel plates; a connecting part (111) is further provided at the front end of the cutting frame (11); the crushing part (12) is vertically welded on the surface of the connecting part (111) and is arranged close to the edge of the connecting part (111); multiple groups of the crushing parts (12) are arranged circumferentially along the edge of the connecting part (111).

3. A pile pulling device according to claim 1, characterized in that: The crushing part (12) is composed of a conical head (121) and a cemented carbide (122) embedded at the conical head (121).

4. A pile pulling device according to claim 1, characterized in that: A splitting plate (113) capable of splitting the soil is further vertically arranged on the surface of the connecting part (111); multiple groups of the splitting plates (113) are provided, and the multiple groups of splitting plates (113) are arranged at intervals between multiple groups of the crushing parts (12) for further splitting the soil.

5. A pile pulling device according to claim 1, characterized in that: The soil-breaking module (1) and the extension frame (2) are connected by a quick-release unit (4); the quick-release unit (4) is composed of a quick plug (41) fixedly arranged at the end of the soil-breaking module (1) and a quick socket (42) fixedly arranged at the front end of the extension frame (2).

6. A pile pulling device according to claim 1, characterized in that: The extension frame (2) is a first U-shaped frame arranged in a long strip shape, and the outer surface of the first U-shaped frame is flush with the outer surface of one side of the cutting frame (11); it is used to guide the cutting frame (11) to continuously penetrate deep into the ground.

7. A pile pulling device according to claim 6, characterized in that: Edges (21) through which a water pipe can pass are further arranged on both sides in the long side direction of the extension frame (2); the edges (21) are used to transmit water towards the soil-breaking module (1) to soften the soil.

8. A pile pulling device according to claim 1, characterized in that: The clamping unit (3) is a second U-shaped frame (31) arranged in a long strip shape, and the second U-shaped frame (31) covers the opening of the extension frame (2) and encloses a rectangular cavity with the extension frame (2) for limiting the square pile, for intermittently clamping the square pile; the outer surface of the second U-shaped frame (31) is flush with the outer surface of the other side of the cutting frame (11).

9. A pile pulling device according to claim 8, characterized in that: First inclined surfaces (32) and second inclined surfaces (32) are respectively formed at both ends of the second U-shaped frame (31).

10. A pile pulling device according to claim 9, characterized in that: An arc-shaped limiting frame (112) capable of unidirectionally limiting the square pile is detachably arranged inside the cutting frame (11).

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