A high strain hammering system for pile foundation

Abstract

The present invention discloses a high-strain hammering system for foundation piles, including an excavator without a bucket at the end of the forearm, a connecting mechanism, a hammering device, and a limiting mechanism. The top of the hammering device is hinged to the end of the forearm of the excavator through the connecting mechanism, and the bottom is sleeved with the pile body through the limiting mechanism. The connecting mechanism is composed of a connecting seat, a connecting rod and a pin. The connecting seat is welded to the top shell of the hammering device. One end of the connecting rod is ball-hinged to the connecting seat, and the other end is vertically rotatably connected to the end of the forearm of the excavator through the pin A. It can be seen from the structure of the present invention that the hammering device is directly hinged to the end of the forearm of the excavator, so that the hammering device is firmly connected, not prone to slipping accidents, and has high safety. At the same time, the limiting mechanism allows the hammering device to be docked with the end of the foundation pile in real time, so the installation is relatively simple and the working efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the field of pile foundation detection, and in particular to a pile foundation high-strain hammering system. Background Art

[0002] The high strain method uses a heavy hammer to impact the top of the pile, measures the force and velocity time history curves at the top of the pile, and uses wave theory analysis to determine the vertical compressive bearing capacity and pile integrity of the single pile. At present, there are two ways to load the existing high strain hammer device: one is to load by crane when the site conditions are general, such as when the land surface is relatively flat; the other is to load by hanging the excavator bucket when the site conditions are poor, such as when the land surface is uneven and the drop is obvious, the crane cannot enter and the test is difficult.

[0003] Of the two methods mentioned above, the first one is less used because the actual construction sites are almost all uneven with obvious height differences. Therefore, the second method is often used, which is to use the on-site excavator bucket to hoist the hammer device. The disadvantages of this method are: since there is no suitable hanging mechanism on the top or other positions of the hammer device, the connection between the excavator bucket and the hammer device is unstable, which is prone to slippage accidents and poses a safety hazard. At the same time, the hammer device is suspended on the excavator bucket, with a large swing amplitude, and the hammer device has no reasonable limiting mechanism, which makes it impossible for the hammer device to be connected to the end of the pile in real time, making installation more difficult and the operating efficiency extremely low. Summary of the invention

[0004] The purpose of the present invention is to provide a high-strain hammering system for pile foundations, overcome the defects of the prior art, solve the problem that the connection between the excavator bucket and the hammering device is unstable, prone to slipping accidents, and poses a safety hazard, and at the same time solve the problem that the hammering device cannot be connected to the end of the pile foundation in real time, the installation is difficult, and the operating efficiency is extremely low.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A high-strain hammering system for foundation piles comprises an excavator without a bucket at the forearm end, a connecting mechanism, a hammering device and a limiting mechanism. The top of the hammering device is hinged to the forearm end of the excavator through the connecting mechanism, and the bottom is sleeved with the pile body through the limiting mechanism.

[0007] A further improvement of the present invention is that the connecting mechanism consists of a connecting seat, a connecting rod and a pin A, the connecting seat is welded to the top shell of the hammer device, one end of the connecting rod is ball-hinged to the connecting seat, and the other end is vertically rotatably connected to the end of the excavator forearm through the pin A.

[0008] A further improvement of the present invention is that the hammer device comprises a housing, a hydraulic jack, a limit top plate, a decoupling device, an energized guide rail, and a heavy hammer, and a "vertically inverted" hydraulic jack is fixed to the inner wall of the top center of the housing by bolts;

[0009] The limit top plate is horizontally fixed between the inner walls of the outer shell by bolts and is located directly below the hydraulic jack. The hydraulic jack push rod passes through the limit top plate and a release device is fixed at the end of the push rod.

[0010] The left and right inner side walls of the shell are provided with two symmetrical electric guide rails, the two electric guide rails are located below the limit top plate, and the heavy hammer slides vertically up and down between the two electric guide rails.

[0011] A further improved solution of the present invention is that the unhooking device comprises an "H"-shaped bottom plate, a left hook, a right hook, and a spring M. The "H"-shaped bottom plate is composed of an intermediate block and a support block. The intermediate block is fixed to the end surface of the hydraulic jack push rod by an embedded bolt.

[0012] Two support blocks are arranged on both left and right sides of the middle block, and the two support blocks on the same side are arranged symmetrically front and back;

[0013] The left hook is vertically rotated between the two support blocks on the left side through the pin shaft B, and the right hook is vertically rotated between the two support blocks on the right side through the pin shaft B;

[0014] One end of the spring M is fixed on the inner side of the left hook, and the other end is fixed on the inner side of the right hook, and the spring M is in a horizontal state.

[0015] A further improvement of the present invention is that a semi-circular upper groove is horizontally provided on the end surface of the hydraulic jack push rod from left to right, and when the intermediate block is fixed to the end surface of the hydraulic jack push rod by embedded bolts, the intermediate block and the end surface of the hydraulic jack push rod form a semi-circular through groove, and the spring M just passes through the through groove.

[0016] A further improvement of the present invention is that when the spring M is in a relaxed state, the left hook and the right hook are both vertical, the top plane of the left hook is inclined, that is, inclined from right to left and downward, and the top plane of the right hook is inclined, that is, inclined from left to right and downward;

[0017] A left supporting hook is provided on the right side of the bottom of the left hook, the top of the left supporting hook is horizontal, and the bottom is inclined, that is, it is inclined from right to left and downward. A right supporting hook is provided on the left side of the bottom of the right hook, the top of the right supporting hook is horizontal, and the bottom is inclined, that is, it is inclined from left to right and downward.

[0018] A further improvement of the present invention is that a left limit block and a right limit block are provided at the bottom of the limit top plate, the two limit blocks are symmetrically arranged on the left and right and are respectively located directly above the left hook and the right hook, the inner side surface of the left limit block is in the shape of an outward convex arc, and the inner side surface of the right limit block is in the shape of an outward convex arc, that is, the top inclined surface of the left hook matches the inner curved surface of the left limit block, and the top inclined surface of the right hook matches the inner curved surface of the right limit block.

[0019] A further improvement of the present invention is that two slide grooves are symmetrically arranged on the inner side walls of the two electrical guide rails, and slide rails matching the two slide grooves are arranged on the left and right sides of the weight.

[0020] A support platform is provided at the center of the top of the weight, and a clamping platform is integrally connected to the center of the top of the support platform. The clamping platform is in the shape of a regular quadrangular pyramid and its bottom side length is greater than the side length of the support platform, that is, a clamping groove is formed between the clamping platform and the top plane of the weight.

[0021] A further improvement of the present invention is that a pile hole is penetrated at the center of the bottom of the shell, and the limiting mechanism is composed of a base block, a spring N, an elastic steel sheet, and a base. Base blocks are provided at the center of the left and right sides and the center of the front and rear sides of the bottom of the shell, and a base is provided between each base block and the pile hole. The base is vertically rotatably connected with an elastic steel sheet through a pin shaft C, and its rotation direction is a positive "cross shape";

[0022] The base block and the elastic steel sheet are connected via a spring N, and the spring N is inclined from inside to outside and downward.

[0023] A further improvement of the present invention is that the elastic steel sheet is divided into three parts: upper, middle and lower. When the elastic steel sheet is clamped on the upper end of the pile body, the upper part is in an outward-facing "X" shape, the middle part is in a vertical shape, and the lower part is in an inward-facing "X" shape.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention provides a high-strain hammering system for pile foundations, wherein the top of the hammering device is ball-hinged to the end of the forearm of the excavator through a connecting mechanism, so that the hammering device is always in a vertical state, making it easy for the limiting mechanism to be sleeved on the upper end of the pile body.

[0026] 2. The present invention provides a high-strain hammering system for pile foundations, wherein two symmetrical electric rails are provided on the left and right inner walls of the outer shell, and the weight slides vertically up and down between the two electric rails, so that the weight can be accelerated to fall through the electric rails, that is, a magnetic field is generated between the two electric rails, and then a Lorentz force is generated, exerting a downward accelerating Lorentz force on the weight to increase the impact force of the weight falling, thereby reducing the lifting height of the weight and reducing the size of the hammering device.

[0027] 3. The present invention provides a high-strain hammer system for pile foundation, in which the left hook is vertically rotated between the two support blocks on the left side through the pin shaft B, and the right hook is vertically rotated between the two support blocks on the right side through the pin shaft B, and one end of the spring M is fixed on the inner side surface of the left hook, and the other end is fixed on the inner side surface of the right hook, so that it is convenient for the upper ends of the left hook and the right hook to be stretched outward or closed inward, so as to achieve the purpose of clamping or releasing the heavy hammer.

[0028] 4. The present invention provides a high-strain hammer system for pile foundations, in which a semi-circular upper groove is horizontally provided on the end surface of the hydraulic jack push rod from left to right. When the middle block is fixed to the end surface of the hydraulic jack push rod by embedded bolts, the middle block and the end surface of the hydraulic jack push rod form a semi-circular through groove, and the spring M just passes through the through groove, which facilitates the compression and resetting of the spring M, thereby achieving the purpose of clamping or releasing the heavy hammer between the left hook and the right hook.

[0029] 5. The present invention provides a high-strain hammer system for pile foundation. When the spring M is in a relaxed state, the left hook and the right hook are both vertical, the top plane of the left hook is inclined, and the top plane of the right hook is inclined. The top inclined surface of the left hook matches the inner arc surface of the left limit block, and the top inclined surface of the right hook matches the inner arc surface of the right limit block, so that the top of the left hook and the top of the right hook can be closed or released smoothly and smoothly.

[0030] 6. The present invention provides a high-strain hammer system for pile foundation, in which the top of the left support hook is horizontal and the bottom is inclined, the top of the right support hook is horizontal and the bottom is inclined, and the clamping platform is in the shape of a regular quadrangular pyramid, so that the bottom inclined surfaces of the left and right support hooks match the side surfaces of the clamping platform. When the heavy hammer is pulled up, the horizontal surfaces of the top of the left and right support hooks just fit against the bottom surface of the clamping platform.

[0031] 7. The present invention provides a high-strain hammer system for pile foundations, in which the clamping platform is in the shape of a regular quadrangular pyramid and the side length of its bottom is greater than the side length of the supporting platform, that is, a clamping groove is formed between the clamping platform and the top plane of the heavy hammer, so that the left and right supporting hooks can be clamped into the clamping groove to lift the heavy hammer.

[0032] 8. The present invention provides a high-strain hammer system for pile foundations, wherein the base is vertically rotatably connected with an elastic steel sheet via a pin shaft C, and the rotation direction thereof is a positive "cross shape", so that the elastic steel sheet can clamp the side walls around the upper end of the pile body to play a positioning role.

[0033] 9. The present invention provides a high-strain hammer system for pile foundations, in which the base block and the elastic steel sheet are connected by a spring N, and the spring N is inclined from the inside to the outside and downward, so as to facilitate the clamping or resetting of the elastic steel sheet.

[0034] 10. The present invention provides a high-strain hammer system for pile foundations. When the elastic steel sheet is clamped on the upper end of the pile body, the upper part is in an outward-facing "X" shape, the middle part is in a vertical shape, and the lower part is in an inward-facing "X" shape. This is conducive to the limiting mechanism being sleeved on the upper end of the pile body, and has high flexibility.

[0035] 11. The high-strain hammering system for pile foundation provided by the present invention is directly hinged to the end of the excavator's forearm through the hammering device, so that the hammering device is firmly connected and not prone to slipping accidents, with high safety. At the same time, through the limiting mechanism, the hammering device and the pile end are connected in real time, the installation is relatively simple, and the working efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is the overall structural front view of the present invention.

[0037] Figure 2 It is an enlarged view of the local structure of the top of the hammer device of the present invention.

[0038] Figure 3 It is an enlarged view of the internal partial structure of the hammer device of the present invention.

[0039] Figure 4 It is a cross-sectional view of the AA structure of the present invention.

[0040] Figure 5 It is a cross-sectional view of the BB structure of the present invention.

[0041] Figure 6 It is a cross-sectional view of the CC structure of the present invention.

[0042] Figure 7 It is a cross-sectional view of the DD structure of the present invention.

[0043] Figure 8 FIG. 1 is a diagram showing a first embodiment of the present invention.

[0044] Fig. 9 It is an enlarged view of the support frame structure of the present invention.

[0045] Fig.10 It is a cross-sectional view of the EE structure of the present invention.

[0046] Fig.11 It is a cross-sectional view of the FF structure of the present invention.

[0047] Fig.12 FIG. 2 is a diagram showing a second embodiment of the present invention. DETAILED DESCRIPTION

[0048] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0049] Example 1: Figures 1 to 8 A high-strain hammering system for pile foundation shown in the figure comprises an excavator 1 without a bucket at the end of the forearm, a connecting mechanism 2, a hammering device 3, and a limiting mechanism 4. The top of the hammering device 3 is hinged to the end of the forearm of the excavator through the connecting mechanism 2, and the bottom is sleeved with the pile body 5 through the limiting mechanism 4; the connecting mechanism 2 is composed of a connecting seat 21, a connecting rod 22 and a pin A23, the connecting seat 21 is welded to the top shell 31 of the hammering device 3, one end of the connecting rod 22 is ball-hinged to the connecting seat 21, and the other end is vertically rotatably connected to the end of the forearm of the excavator 1 through the pin A23.

[0050] The hammering device 3 includes a shell 31, a hydraulic jack 32, a limit top plate 33, a decoupling device 34, an electrified guide rail 35, and a heavy hammer 36. A "vertically inverted" hydraulic jack 32 is fixed to the inner wall of the top center of the shell 31 by bolts; the limit top plate 33 is horizontally fixed between the inner walls around the shell 31 by bolts and is located directly below the hydraulic jack 32. The hydraulic jack 32 push rod passes through the limit top plate 33 and a decoupling device 34 is fixed to the end of the push rod; two left-right symmetrical electrified guide rails 35 are provided on the left and right inner walls of the shell 31, and the two electrified guide rails 35 are located below the limit top plate 33. The heavy hammer 36 slides vertically up and down between the two electrified guide rails 35.

[0051] The unhooking device 34 includes an "H"-shaped bottom plate 341, a left hook 342, a right hook 343, and a spring M344. The "H"-shaped bottom plate 341 is composed of an intermediate block 345 and a support block 346. The intermediate block 345 is fixed to the end face of the top rod of the hydraulic jack 32 by an embedded bolt; two support blocks 346 are arranged on both sides of the left and right sides of the intermediate block 345, and the two support blocks 346 on the same side are symmetrically arranged front and back; the left hook 342 is vertically rotated between the two support blocks 346 on the left side through a pin shaft B347, and the right hook 343 is vertically rotated between the two support blocks 346 on the right side through the pin B347; one end of the spring M344 is fixed on the inner side of the left hook 342, and the other end is fixed on the inner side of the right hook 343, and the spring M344 is in a horizontal state from left to right; a semi-circular upper groove is horizontally provided on the end face of the hydraulic jack 32 push rod, from left to right, when the middle block 345 is fixed on the end face of the hydraulic jack 32 push rod by the embedded bolt, the middle block 345 and the end face of the hydraulic jack 32 push rod form a semi-circular through groove 37, the The spring M344 just passes through the through slot 37; when the spring M344 is in a relaxed state, the left hook 342 and the right hook 343 are both vertical, the top plane of the left hook 342 is inclined, that is, it is inclined from right to left and downward, and the top plane of the right hook 343 is inclined, that is, it is inclined from left to right and downward; a left support hook 348 is provided on the right side of the bottom of the left hook 342, the top of the left support hook 348 is horizontal, and the bottom is inclined, that is, it is inclined from right to left and downward, and a right support hook 348 is provided on the left side of the bottom of the right hook 343 9. The top of the right support hook 349 is horizontal, and the bottom is inclined, that is, it is inclined from left to right and downward; the bottom of the limiting top plate 33 is provided with a left limiting block 61 and a right limiting block 62, the two limiting blocks are symmetrically arranged and are respectively located directly above the left hook 342 and the right hook 343, the inner side surface of the left limiting block 61 is in an outward convex arc shape, and the inner side surface of the right limiting block 62 is in an outward convex arc shape, that is, the top inclined surface of the left hook 342 matches the inner curved surface of the left limiting block 61, and the top inclined surface of the right hook 343 matches the inner curved surface of the right limiting block 62.

[0052] The inner wall of the two-way electric guide rail 35 is symmetrically provided with two slide grooves 351, and the left and right sides of the weight 36 are provided with slide rails 352 matching the two slide grooves 351; a support platform 7 is provided at the center of the top of the weight 36, and a clamping platform 8 is integrally connected to the center of the top of the support platform 7. The clamping platform 8 is in the shape of a regular quadrangular pyramid and its bottom side length is greater than the side length of the support platform 7, that is, a clamping groove 70 is formed between the clamping platform 8 and the top plane of the weight 36; a pile hole 9 is penetrated at the center of the bottom of the shell 31, and the limiting mechanism 4 is composed of a base block 41, a spring N42, an elastic steel sheet 43, and a base 44. Base blocks 41 are provided at the center of the left and right sides and the center of the front and rear sides of the bottom of the shell 31. A base 44 is provided between each base block 41 and the pile hole 9. The base 44 is vertically rotatably connected with an elastic steel sheet 43 through a pin shaft C45, and its rotation direction is a positive "cross shape"; the base block 41 and the elastic steel sheet 43 are connected by a spring N42, and the spring N42 is inclined from the inside to the outside and downward; the elastic steel sheet 43 is divided into three parts: upper, middle and lower parts. When the elastic steel sheet 43 is clamped on the upper end of the pile body 5, the upper part is in an outward eight-shaped shape, the middle part is in a vertical shape, and the lower part is in an inner eight-shaped shape.

[0053] The working mode of the present invention is as follows:

[0054] First, unload the bucket at the end of the excavator's forearm, and install the entire hammer device 3 at the end of the excavator's forearm through the connecting mechanism 2. Secondly, turn on the excavator to move the hammer device 3 to the top of the pile body 5. Then, control the excavator's forearm to slowly descend, approach the end of the pile body 5, and position it through the limiting mechanism 4, that is, the elastic steel sheet 43 is clamped at the upper end of the pile body 5, and finally a hammer test is carried out.

[0055] Among them, the working principle of the hammer device 3 is:

[0056] First, the hydraulic jack 32 is used to extend the push rod, so that the left support hook 348 and the right support hook 349 are lowered at the same time;

[0057] Then, the left support hook 348 and the right support hook 349 are gradually stretched outward along the left and right sides of the card platform 8, respectively, until the two support hooks are clamped in the card slot 70;

[0058] Finally, pull up the top rod of the hydraulic jack 32 to make the heavy hammer 36 rise. When the top inclined surfaces of the left hook 342 and the right hook 343 contact the left limit block 61 and the right limit block 62 respectively, the left support hook 348 and the right support hook 349 gradually open outward until the heavy hammer 36 falls, and then hammers the end of the pile body 5.

[0059] Example 2: Figure 3As shown, a proximity switch 71 is fixed on the front side of the middle block 345 by a locking bolt, which is used to determine whether the top surface of the card table 8 is close to the proximity switch 71 (the front and rear distance of the top surface of the card table 8 is greater than the front and rear distance of the middle block 345). When the top surface of the card table 8 is close to the proximity switch 71, the power-on rail 35 is de-energized to prevent the power-on rail 35 from being energized all the time, so that the heavy hammer is always in an accelerated state and the hammering impact force is too strong; when the card table 8 leaves the proximity switch 71, that is, the heavy hammer 36 falls, the power-on rail 35 is energized, so that a magnetic field is generated between the two power-on rails 35, and then a Lorentz force is generated, which applies a downward accelerating Lorentz force to the heavy hammer 36, increases the impact force of the heavy hammer 36 falling, and then reduces the lifting height of the heavy hammer 36, and reduces the size of the hammering device 3. The proximity switch 71 involved adopts a proximity switch with model I2B0802NO.

[0060] Example 3: Fig. 9 to Fig.12 As shown, four support frames 81 are welded in a positive "cross" shape on the side walls around the lower part of the housing 31. A hydraulic cylinder (82) is fixed to each support frame 81 by bolts. The hydraulic cylinder (82) is inverted and the top rod is inclined. A soil shovel (83) is fixed to the top rod of the hydraulic cylinder (82). The direction of the soil shovel (83) is consistent with that of the top rod of the hydraulic cylinder (82), and the bottom circle of the soil shovel (83) just forms a circle. The radius of this circle is greater than or equal to the radius of the pile body 5. The pile body buried underground can be moved by the soil shovel (83). 5 is dug out, and then the upper end of the pile body 5 is leaked out, which is convenient for the installation of the hammer device 3, eliminating the need for manual digging preparation before the test, which is conducive to rapid detection of the test and improving work efficiency. At the same time, before digging the soil, the top rod of the hydraulic cylinder 82 can be extended, and the earth shovel 83 can first contact the bottom surface to play a supporting role, which is convenient for stabilizing the entire hammer device 3, which is conducive to the limit mechanism 4 docking the upper end of the pile body 5, and also avoids the limit mechanism 4 from touching the ground during the movement of the hammer device 3, causing pollution or even wear of the limit mechanism 4.

Claims

1. A high strain hammering system for pile foundation, characterized by: The invention comprises an excavator (1) without a bucket at the end of the forearm, a connecting mechanism (2), a hammer device (3), and a limiting mechanism (4); the top of the hammer device (3) is hinged to the end of the forearm of the excavator through the connecting mechanism (2), and the bottom is sleeved with the pile body (5) through the limiting mechanism (4); the connecting mechanism (2) is composed of a connecting seat (21), a connecting rod (22), and a pin A (23); the connecting seat (21) is welded to the top shell (31) of the hammer device (3); one end of the connecting rod (22) is ball-hinged to the connecting seat (21), and the other end is vertically rotatably connected to the end of the forearm of the excavator (1) through the pin A (23); the hammer device (3) comprises a shell (31), a hydraulic jack (32), a limiting top plate (33), a decoupling device (34), an energized guide rail (35), and a heavy hammer (36); a "vertically inverted" hydraulic jack (32) is fixed to the top center inner wall of the shell (31) by bolts; The limit top plate (33) is horizontally fixed between the inner walls of the outer shell (31) by bolts and is located directly below the hydraulic jack (32); the top rod of the hydraulic jack (32) passes through the limit top plate (33) and a release device (34) is fixed to the end of the top rod; Two symmetrical electrical guide rails (35) are provided on the left and right inner side walls of the housing (31), the two electrical guide rails (35) are located below the limit top plate (33), and the weight (36) slides vertically up and down between the two electrical guide rails (35); The unhooking device (34) comprises an "H"-shaped bottom plate (341), a left hook (342), a right hook (343), and a spring M (344); the "H"-shaped bottom plate (341) is composed of an intermediate block (345) and a support block (346); the intermediate block (345) is fixed to the end surface of the top rod of the hydraulic jack (32) by means of embedded bolts; Two support blocks (346) are provided on both left and right side surfaces of the middle block (345), and the two support blocks (346) on the same side are symmetrically arranged front to back; The left hook (342) is vertically rotated between the two support blocks (346) on the left side through the pin shaft B (347), and the right hook (343) is vertically rotated between the two support blocks (346) on the right side through the pin shaft B (347); One end of the spring M (344) is fixed on the inner side of the left hook (342), and the other end is fixed on the inner side of the right hook (343), and the spring M (344) is in a horizontal state.

2. A high strain hammer system for pile foundation according to claim 1, characterized in that: A semi-circular upper groove is horizontally provided on the end surface of the hydraulic jack (32) push rod from left to right. When the middle block (345) is fixed to the end surface of the hydraulic jack (32) push rod by means of embedded bolts, the middle block (345) and the end surface of the hydraulic jack (32) push rod form a semi-circular through groove (37), and the spring M (344) just passes through the through groove (37).

3. A high strain hammer system for pile foundation according to claim 1, characterized in that: When the spring M (344) is in a relaxed state, the left hook (342) and the right hook (343) are both vertical, the top plane of the left hook (342) is inclined, that is, inclined from right to left and downward, and the top plane of the right hook (343) is inclined, that is, inclined from left to right and downward; A left supporting hook (348) is provided on the right side of the bottom of the left hook (342); the top of the left supporting hook (348) is horizontal and the bottom is inclined, i.e., inclined from right to left and downward; a right supporting hook (349) is provided on the left side of the bottom of the right hook (343); the top of the right supporting hook (349) is horizontal and the bottom is inclined, i.e., inclined from left to right and downward.

4. A high strain hammer system for pile foundation according to claim 3, characterized in that: A left limit block (61) and a right limit block (62) are provided at the bottom of the limit top plate (33). The two limit blocks are symmetrically arranged and are respectively located directly above the left hook (342) and the right hook (343). The inner side surface of the left limit block (61) is in an outward convex arc shape, and the inner side surface of the right limit block (62) is in an outward convex arc shape, that is, the top inclined surface of the left hook (342) matches the inner curved surface of the left limit block (61), and the top inclined surface of the right hook (343) matches the inner curved surface of the right limit block (62).

5. The high strain hammer system for pile foundation according to claim 1, characterized in that: Two slide grooves (351) are symmetrically arranged on the inner side walls of the two electrical guide rails (35), and slide rails (352) matching the two slide grooves (351) are arranged on the left and right sides of the weight (36); A support platform (7) is provided at the center of the top of the weight (36), and a clamping platform (8) is integrally connected to the center of the top of the support platform (7). The clamping platform (8) is in the shape of a regular quadrangular pyramid and has a bottom side length greater than the side length of the support platform (7), that is, a clamping groove (70) is formed between the clamping platform (8) and the top plane of the weight (36).

6. The high strain hammer system for pile foundation according to claim 1, characterized in that: A pile hole (9) is formed through the center of the bottom of the housing (31). The limiting mechanism (4) is composed of a base block (41), a spring N (42), an elastic steel sheet (43), and a base (44). Base blocks (41) are provided at the center of the left and right sides and the center of the front and rear sides of the bottom of the housing (31). A base (44) is provided between each base block (41) and the pile hole (9). The base (44) is vertically rotatably connected to an elastic steel sheet (43) via a pin shaft C (45), and the rotation direction thereof is in a positive "cross" shape. The base block (41) and the elastic steel sheet (43) are connected via a spring N (42), and the spring N (42) is inclined from the inside to the outside and downward.

7. A high strain hammer system for pile foundation according to claim 6, characterized in that: The elastic steel sheet (43) is divided into three parts: upper, middle and lower. When the elastic steel sheet (43) is clamped on the upper end of the pile body (5), the upper part is in an outward-facing "X" shape, the middle part is in a vertical shape, and the lower part is in an inward-facing "X" shape.

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