Pile foundation large strain test equipment

Abstract

The invention relates to the technical field of strain test equipment, and discloses pile foundation large strain test equipment which comprises a main body assembly and a supporting frame, four guide plates are fixed to the inner wall of the supporting frame, a balancing weight is arranged among the four guide plates in a sliding mode, and a blocking seat is fixed to one side of each guide plate through a bolt. A winch is fixed to the top of the supporting frame, a winding rope is wound on the winch, and a positioning ring is fixed to the supporting frame. And a connecting assembly. The beneficial effects of the invention are that through the arrangement of the connecting assembly, the connecting seat and the clamping seat can automatically complete butt joint, stable connection can be completed without human assistance, during release, the electric push rod is used for driving, limiting can be released, the whole process is automatically operated, the potential safety hazard of personnel intervening in heavy object operation is reduced, and the test interval time is greatly shortened; and through cooperative stress of the inhaul cable and the connecting rope, it can be ensured that the balancing weight cannot fall off in the hoisting process, and the stability and safety of equipment operation are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of strain testing equipment, in particular to a large strain testing equipment for pile foundations. Background Art

[0002] In the field of pile foundation engineering quality inspection, large strain testing is a key means to evaluate the vertical bearing capacity and pile integrity of the foundation pile. Its core principle is to generate stress waves by letting a heavy hammer (counterweight block) fall freely and hit the top of the pile, and use sensors to collect data for analysis. Existing large-strain pile foundation testing equipment has many limitations in actual operation: First, the installation and commissioning of the equipment relies on auxiliary machinery such as cranes. The counterweight block needs to be lifted by the crane and its position needs to be repeatedly adjusted, which not only increases equipment investment and site occupancy, but also prolongs the test preparation time due to mechanical scheduling, reducing work efficiency; second, the connection between the counterweight block and the lifting device requires manual assistance. The operator needs to work under or near the heavy object, which poses a safety hazard of being hit or squeezed. In addition, the manual docking accuracy is low, and the counterweight block can easily fall off due to unstable connection; third, the base of the test equipment lacks a convenient horizontal adjustment mechanism. When the site is uneven, the falling trajectory of the counterweight block can easily deviate from the plumb line, resulting in uneven distribution of impact energy, affecting the accuracy of the test data. Summary of the Invention

[0003] In view of the above problems and / or the problems existing in the existing pile foundation large strain testing equipment, the present invention is proposed.

[0004] Therefore, the problem to be solved by the present invention is that the connection between the counterweight block and the lifting device of the existing pile foundation large strain test equipment is relatively inconvenient during use.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a pile foundation large strain test equipment, comprising: a main body assembly, including a support frame, four guide plates fixed to the inner wall of the support frame, a counterweight block sliding between the four guide plates, a blocking seat fixed to one side of the guide plate by bolts, a winch fixed to the top of the support frame, a winding rope wound on the winch, and a positioning ring fixed to the support frame; A connecting assembly is arranged at the end of the winding rope and includes a connecting piece, which includes a support plate fixed to the end of the winding rope, a pull rope fixed to the bottom of the support plate, a connecting plate fixed to the other end of the pull rope, a connecting seat fixed to the bottom of the connecting plate, an insert sliding in the connecting seat, a clamping seat fixed to the top of the counterweight block, a chamfer and a connecting groove provided on the inner wall of the clamping seat, and the insert block can be inserted into the connecting groove.

[0006] As a preferred solution of the pile foundation large strain test equipment described in the present invention, the connecting assembly also includes a driving member arranged in the connecting seat, the driving member includes a lifting pin sliding in the connecting seat, a first spring is fixed in the lifting pin, the other end of the first spring is fixed to the inner wall of the connecting seat, an arc groove is provided on the surface of the plug block, and the end of the lifting pin is inserted into the arc groove.

[0007] As a preferred solution of the pile foundation large strain testing equipment described in the present invention, the driving part also includes an extrusion plate fixed to one side of the plug block, an extrusion cone is fixed in the clamping seat, a magnetic ring is fixed in the connecting seat, a metal sheet is fixed in the clamping seat, and an extrusion surface is provided on the extrusion plate.

[0008] As a preferred solution of the pile foundation large strain test equipment described in the present invention, the connecting assembly also includes a limiting member arranged in the connecting seat, the limiting member includes a limiting seat sliding in the connecting seat, a connecting rod is fixed on the top of the limiting seat, and a connecting ring is fixed on the top of the connecting rod.

[0009] As a preferred solution of the pile foundation large strain test equipment described in the present invention, the limiting member also includes a connecting rope fixed to the top of the connecting ring, the other end of the connecting rope is fixed to the bottom of the support plate, and a second spring is fixed between the support plate and the connecting plate.

[0010] As a preferred solution of the pile foundation large strain test equipment described in the present invention, the connecting assembly also includes a positioning member arranged on the top of the connecting seat, the positioning member includes a support plate fixed to the surface of the connecting ring, a movable plate slides at the bottom of the support plate, and a positioning seat is fixed on the top of the movable plate.

[0011] As a preferred solution of the pile foundation large strain test equipment described in the present invention, the positioning member also includes a slide rail fixed to the bottom of the movable plate, a slide groove is provided on the top of the connecting seat, the slide rail slides in the slide groove, and an unlocking plate is fixed on the top of the movable plate.

[0012] As a preferred solution of the pile foundation large strain test equipment described in the present invention, a power part is provided on the top of the connecting seat, and the power part includes an extrusion sleeve sliding in the movable plate, a third spring is fixed in the extrusion sleeve, and the other end of the third spring is fixed to the inner wall of the movable plate.

[0013] As a preferred solution of the pile foundation large strain test equipment described in the present invention, the power part also includes a push plate fixed to one side of the two extrusion sleeves, an electric push rod is fixed to one side of the push plate, a mounting seat is fixed on the electric push rod, and the mounting seat is fixed to the top of the connecting seat by bolts.

[0014] As a preferred solution of the pile foundation large strain test equipment of the present invention, the main body component further includes a support seat fixed on the surface of the support frame, and a hydraulic leg is fixed on the support seat.

[0015] The beneficial effects of the present invention are as follows: by providing a connection assembly, the connection seat and the clamping seat can be automatically docked, and a stable connection can be completed without manual assistance. When released, the limit can be released by driving the electric push rod, and the whole process is automated, which reduces the safety hazards of human intervention in heavy object operations and greatly shortens the test interval time. The coordinated force of the guy wire and the connecting rope can ensure that the counterweight will not fall off during the lifting process, significantly improving the stability and safety of the equipment operation; The counterweight can be hoisted by a winch, eliminating the need for cranes and other mechanical equipment, saving work space; By adjusting the length of the output end of the hydraulic leg, the balance of the support frame can be adjusted to improve the accuracy of the test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0017] Figure 1 This is the structural diagram of the pile foundation large strain test equipment.

[0018] Figure 2 This is the structural diagram of the counterweight block of the pile foundation large strain test equipment.

[0019] Figure 3 For pile foundation large strain test equipment Figure 2 A partial enlarged structural diagram of point A in the middle.

[0020] Figure 4 This is a cross-sectional structural diagram of the connector for the pile foundation large strain testing equipment.

[0021] Figure 5 For pile foundation large strain test equipment Figure 4 A partial enlarged structural diagram of point B in the middle.

[0022] Figure 6 This is the structural diagram of the connection seat of the pile foundation large strain test equipment.

[0023] Figure 7 This is a cross-sectional structural diagram of the limit seat of the pile foundation large strain test equipment.

[0024] Figure 8 This is the plug structure diagram of the pile foundation large strain test equipment.

[0025] Figure 9 This is a cross-sectional structural diagram of the extrusion sleeve of the pile foundation large strain test equipment.

[0026] Figure 10 This is a cross-sectional structural diagram of the slide rail of the pile foundation large strain test equipment.

[0027] Figure: main assembly 1; support frame 11; four guide plates 14; counterweight 15; blocking seat 16; winch 17; winding rope 18; positioning ring 19; connecting assembly 2; connecting member 21; supporting plate 211; cable 212; connecting plate 213; connecting seat 214; insert 215; clamping seat 216; chamfer 216-1; connecting groove 216-2; driving member 22; lifting pin 221; first spring 222; arc groove 215-1; extrusion plate 223; extrusion cone 224 ; Magnetic ring 225; Metal sheet 226; Extrusion surface 223-1; Limiting member 23; Limiting seat 231; Connecting rod 232; Connecting ring 233; Connecting rope 234; Second spring 235; Positioning member 24; Support plate 241; Moving plate 242; Positioning seat 243; Slide rail 244; Slide groove 214-1; Unlocking plate 245; Power member 25; Extrusion sleeve 251; Third spring 252; Push plate 253; Electric push rod 254; Mounting seat 255; Support seat 12; Hydraulic leg 13. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0031] Example 1 Reference Figures 1 to 5 and Figure 7, which is the first embodiment of the present invention, and provides a large strain test equipment for pile foundation, which includes a main body component 1, including a support frame 11, four guide plates 14 are fixed to the inner wall of the support frame 11, and a counterweight block 15 is slid between the four guide plates 14, which is used to guide the lifting and lowering of the counterweight block 15, so that the counterweight block 15 descends in the vertical direction under the action of weight, and each guide plate 14 is fixed with a blocking seat 16 on one side by bolts, and the blocking seat 16 is used to support the counterweight block 15. When the support frame 11 is lifted, the counterweight block 15 can be supported by the blocking seat 16, so that the counterweight block 15 is lifted together, so that the counterweight block 15 falls on the top of the pile foundation. The support frame 11 is located outside the pile foundation, and a winch 17 is fixed on the top of the support frame 11. A winding rope 18 is wound on the winch 17. A positioning ring 19 is fixed on the support frame 11, and the positioning ring 19 is located below the winch 17. One end of the winding rope 18 is fixed to the winch 17 and can be wound up by the winch 17. The winding rope 18 passes through the through hole of the positioning ring 19. The upper and lower ends of the through hole of the positioning ring 19 are provided with rounded corners to prevent the winding rope 18 from being worn by the positioning ring 19 when sliding. The positioning ring 19 is located on the central axis of the support frame 11, so that when the winding rope 18 passes through the positioning ring 19 to hoist the counterweight 15, it is just connected to the top of the center of gravity of the counterweight 15, so that the counterweight 15 will not be offset.

[0032] The connecting component 2 is arranged at the end of the winding rope 18, and includes a connecting part 21. The connecting part 21 includes a support plate 211 fixed to the end of the winding rope 18. A cable 212 is fixed to the bottom of the support plate 211, and a connecting plate 213 is fixed to the other end of the cable 212. In the figure, the cable 212 is in a loose state, and a connecting seat 214 is fixed to the bottom of the connecting plate 213. Four plug-in blocks 215 slide in the connecting seat 214. A clamping seat 216 is fixed to the top of the counterweight block 15. The inner wall of the clamping seat 216 is provided with a chamfer 216-1 and a connecting groove 216-2, and the plug-in block 215 can be inserted into the connecting groove 216-2.

[0033] When the insert block 215 is inserted into the connecting groove 216-2, the winding rope 18 pulls the support plate 211, which allows the support plate 211 to pull the connecting plate 213 through the pull rope 212, so that the connecting plate 213 pulls the connecting seat 214 upward, so that the connecting seat 214 drives the clamping seat 216 to move upward through the insert block 215, so that the clamping seat 216 drives the counterweight block 15 to move upward.

[0034] The end of the insert block 215 is provided with a chamfer. After the insert block 215 is inserted into the connecting groove 216 - 2 , the clamping seat 216 can squeeze the chamfer of the end of the insert block 215 , so that the insert block 215 can be retracted into the connecting seat 214 .

[0035] Example 2 Reference Figure 4 、 Figure 5 、 Figure 7 and Figure 8 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment.

[0036] Specifically, the connecting component 2 also includes a driving member 22 arranged in the connecting seat 214, and the driving member 22 includes a lifting pin 221 that slides in the connecting seat 214. A first spring 222 is fixed in the lifting pin 221, and the other end of the first spring 222 is fixed to the inner wall of the connecting seat 214. An arc groove 215-1 is opened on the surface of the plug block 215, and the end of the lifting pin 221 is inserted into the arc groove 215-1.

[0037] The first spring 222 is in a compressed state. Through the elastic force of the first spring 222, the end of the lifting pin 221 can be inserted into the arc groove 215-1, thereby preliminarily positioning the position of the insert block 215. When the counterweight block 15 drives the clamping seat 216 to squeeze the chamfer of the end of the insert block 215, the insert block 215 can be retracted into the connecting seat 214, thereby moving the arc groove 215-1 away from the end of the lifting pin 221.

[0038] Specifically, the driving member 22 also includes an extrusion plate 223 fixed to one side of the plug block 215, an extrusion cone 224 is fixed in the clamping seat 216, a magnetic ring 225 is fixed in the connecting seat 214, a metal sheet 226 is fixed in the clamping seat 216, and an extrusion surface 223-1 is opened on the extrusion plate 223.

[0039] When the connecting seat 214 falls into the clamping seat 216, as the connecting seat 214 falls, the magnetic ring 225 will attract the metal sheet 226, thereby increasing the force for the connecting seat 214 to move downward. At this time, the extrusion cone 224 can squeeze the extrusion surface 223-1 of the four extrusion plates 223, so that the extrusion plates 223 push the plug 215 to be inserted into the connecting groove 216-2.

[0040] Specifically, the connecting component 2 also includes a limiting member 23 arranged in the connecting seat 214, the limiting member 23 includes a limiting seat 231 sliding in the connecting seat 214, a connecting rod 232 is fixed on the top of the limiting seat 231, the connecting rod 232 slides in the connecting seat 214, and a connecting ring 233 is fixed on the top of the connecting rod 232.

[0041] When the connecting ring 233 rises, the limit seat 231 can be driven to rise by the connecting rod 232. Two limit seats 231 are provided on one side of the end of each plug block 215, which are used to limit the plug block 215 so that the plug block 215 cannot slide into the connecting seat 214, so that the other end of the plug block 215 stays in the connecting groove 216-2. In this way, when the connecting seat 214 rises, it can drive the clamping seat 216 to move upward, thereby driving the counterweight block 15 to move upward.

[0042] Specifically, the limiting member 23 also includes a connecting rope 234 fixed to the top of the connecting ring 233, the other end of the connecting rope 234 is fixed to the bottom of the support plate 211, and a second spring 235 is fixed between the support plate 211 and the connecting plate 213. The second spring 235 is currently in a stretched state under the pull of the weight of the connecting seat 214.

[0043] When the winding rope 18 is pulled upward, the support plate 211 can be driven to move upward, so that the support plate 211 pulls the connecting rope 234, so that the connecting rope 234 drives the connecting ring 233 to move upward, so that the connecting ring 233 drives the limiting seat 231 to move upward through the connecting rod 232, so that the limiting seat 231 moves to the end of the plug block 215, limiting the plug block 215 so that the plug block 215 cannot slide into the connecting seat 214. At this time, the connecting rope 234 and the cable 212 are both in a straight state.

[0044] The connecting rope 234 has a certain elastic force. When the connecting rope 234 and the pull rope 212 are in a straight state at the same time, if a pulling force is applied to the connecting rope 234 by an external force, the connecting rope 234 can be stretched, so that the connecting ring 233 can move downward in the current state.

[0045] Example 3 Reference Figures 1 to 10 , which is the third embodiment of the present invention, and is based on the first two embodiments.

[0046] Specifically, the connecting component 2 also includes a positioning member 24 arranged on the top of the connecting seat 214. The positioning member 24 includes a support plate 241 fixed to the surface of the connecting ring 233. There are two support plates 241, which are symmetrically arranged. A movable plate 242 slides at the bottom of the support plate 241, and a positioning seat 243 is fixed on the top of the movable plate 242.

[0047] When the connecting ring 233 drives the limiting seat 231 to move upward to the end of the insert block 215 through the connecting rod 232, the support plate 241 will rise synchronously. At this time, moving the movable plate 242 can move the positioning seat 243 to the bottom of the support plate 241, thereby supporting the support plate 241 and preventing the connecting ring 233 from descending and resetting.

[0048] Specifically, the positioning member 24 also includes a slide rail 244 fixed to the bottom of the movable plate 242, and a slide groove 214-1 is provided on the top of the connecting seat 214. The slide rail 244 slides in the slide groove 214-1 to limit the movable plate 242 so that the movable plate 242 can slide stably. An unlocking plate 245 is fixed on the top of the movable plate 242.

[0049] When the connecting ring 233 needs to move downward, the moving plate 242 moves in the opposite direction, driving the unlocking plate 245 to move closer to the support plate 241. At this time, the positioning seat 243 is away from the support plate 241, and the support for the support plate 241 is released. When the arc surface of the unlocking plate 245 squeezes the support plate 241, the support plate 241 can drive the connecting ring 233 to move downward, so that the connecting ring 233 and the connecting rod 232 drive the limiting seat 231 to move downward, thereby resetting the limiting seat 231 and releasing the limit on the insert block 215, so that the insert block 215 can be retracted into the connecting seat 214, thereby releasing the limit on the clamping seat 216, so that the clamping seat 216 and the counterweight block 15 fall downward under the action of gravity, thereby impacting the pile foundation below.

[0050] Specifically, a power piece 25 is provided on the top of the connecting seat 214, and the power piece 25 includes an extrusion sleeve 251 that slides in the movable plate 242. A third spring 252 is fixed in the extrusion sleeve 251. The other end of the third spring 252 is fixed to the inner wall of the movable plate 242. The third spring 252 is in a stretched state. When the connecting ring 233 drives the support plate 241 to rise, the third spring 252 can pull the movable plate 242, so that the movable plate 242 drives the positioning seat 243 to move to the bottom of the support plate 241, thereby supporting the support plate 241. At this time, the extrusion sleeve 251 moves to the inner bottom wall of the movable plate 242.

[0051] Specifically, the power component 25 also includes a push plate 253 fixed to one side of the two extrusion sleeves 251, an electric push rod 254 is fixed to one side of the push plate 253, a mounting seat 255 is fixed on the electric push rod 254, and the mounting seat 255 is fixed to the top of the connecting seat 214 by bolts.

[0052] Starting the electric push rod 254 can make it push the push plate 253, so that the push plate 253 drives the two extrusion sleeves 251 to push the movable plate 242, so that the movable plate 242 drives the unlocking plate 245 to approach the support plate 241. At this time, the positioning seat 243 moves away from the support plate 241, releasing the support for the support plate 241.

[0053] Specifically, the main body component 1 also includes a support seat 12 fixed on the surface of the support frame 11, and a hydraulic leg 13 is fixed on the support seat 12. The hydraulic leg 13 is a prior art. The hydraulic leg 13 can be extended and retracted under the drive of hydraulic force, thereby adjusting the length of each output end of the hydraulic leg 13. A balance detection mechanism is provided on the support frame 11, which can detect the balance of the support frame 11. When it is detected that the support frame 11 is skewed, the length of the output end of each hydraulic leg 13 can be adjusted to make the support frame 11 in a balanced state. At this time, the guide plate 14 does not affect the free fall movement of the counterweight block 15.

[0054] In summary, our invention has the following beneficial effects: 1. Automatic connection and locking, improving operational efficiency and safety: In the connecting assembly 2, the connecting seat 214 and the clamping seat 216 are initially connected by chamfer 216-1. The magnetic ring 225 and the metal sheet 226 enhance the fit. The extrusion cone 224 pushes the plug 215 into the connecting groove 216-2, and the limit seat 231 of the limit member 23 locks the position, completing a stable connection without manual assistance. When releasing, the electric push rod 254 drives the unlocking plate 245 to release the limit. The fully automated operation reduces the safety risks of human intervention in heavy work and significantly shortens the test interval. 2. The connection structure has an adaptive and anti-falling design to improve the stability of the equipment: the first spring 222 in the driving part 22 pushes the lifting pin 221 to embed into the arc groove 215-1 of the insert block 215 to achieve preliminary positioning; the rigid positioning of the insert block 215 by the limit seat 231, combined with the coordinated force of the cable 212 and the connecting rope 234, ensures that the counterweight block 15 will not fall off during the lifting process, significantly improving the stability and safety of the equipment operation.

[0055] During use, when the counterweight 15 needs to be hoisted, the winch 17 is first used to unwind the reeling rope 18 so that the connecting seat 214 falls toward the chamfer 216 - 1 of the clamping seat 216 . Through the setting of the chamfer 216 - 1 , the connecting seat 214 falls into the clamping seat 216 .

[0056] As the connecting seat 214 falls, the magnetic ring 225 will attract the metal sheet 226, thereby increasing the force for the connecting seat 214 to move downward. At this time, the extrusion cone 224 can squeeze the extrusion surface 223-1 of the four extrusion plates 223, so that the extrusion plates 223 push the plug 215 to be inserted into the connecting groove 216-2.

[0057] At this time, the winch 17 is used to reel in the reeling rope 18. At this time, the reeling rope 18 is pulled upward, which can drive the support plate 211 to move upward, so that the support plate 211 pulls the connecting rope 234, so that the connecting rope 234 drives the connecting ring 233 to move upward, so that the connecting ring 233 drives the limiting seat 231 to move upward through the connecting rod 232, so that the limiting seat 231 moves to the end of the plug block 215, limits the plug block 215, and prevents the plug block 215 from sliding into the connecting seat 214. At this time, the connecting rope 234 and the cable 212 are both in a straight state.

[0058] When the connecting ring 233 drives the support plate 241 to rise, the third spring 252 can pull the movable plate 242, so that the movable plate 242 drives the positioning seat 243 to move below the support plate 241, thereby supporting the support plate 241 and preventing the connecting ring 233 from moving downward.

[0059] The cable 212 pulls the connecting disk 213 so that the connecting disk 213 pulls the connecting seat 214 upward, thereby causing the connecting seat 214 to drive the clamping seat 216 to move upward through the insert block 215, thereby causing the clamping seat 216 to drive the counterweight 15 to move upward.

[0060] When the counterweight 15 needs to be released, the electric push rod 254 is started, which can cause the electric push rod 254 to push the push plate 253, thereby causing the push plate 253 to drive the two extrusion sleeves 251 to push the movable plate 242, thereby causing the movable plate 242 to drive the unlocking plate 245 to move closer to the support plate 241. At this time, the positioning seat 243 is away from the support plate 241, releasing the support of the support plate 241, and the arc surface of the unlocking plate 245 squeezes the support plate 241, which can cause the support plate 241 to drive the connecting ring 233 to move downward, so that the connecting ring 233 and the connecting rod 232 drive the limiting seat 231 to move downward, thereby restoring the limiting seat 231, releasing the limit on the insert block 215, allowing the insert block 215 to retract into the connecting seat 214, thereby releasing the limit on the clamping seat 216, causing the clamping seat 216 and the counterweight 15 to fall downward under the action of gravity, thereby impacting the pile foundation below.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A large strain testing equipment for pile foundation, characterized by: include, A main assembly (1) includes a support frame (11), four guide plates (14) are fixed to the inner wall of the support frame (11), a counterweight (15) slides between the four guide plates (14), a blocking seat (16) is fixed to one side of the guide plate (14) by bolts, a winch (17) is fixed to the top of the support frame (11), a winding rope (18) is wound around the winch (17), and a positioning ring (19) is fixed to the support frame (11); A connecting assembly (2) is arranged at the end of the winding rope (18), comprising a connecting piece (21), wherein the connecting piece (21) comprises a support plate (211) fixed to the end of the winding rope (18), a cable (212) being fixed at the bottom of the support plate (211), a connecting plate (213) being fixed at the other end of the cable (212), a connecting seat (214) being fixed at the bottom of the connecting plate (213), an insert (215) sliding in the connecting seat (214), a clamping seat (216) being fixed at the top of the counterweight (15), a chamfer (216-1) and a connecting groove (216-2) being provided on the inner wall of the clamping seat (216), and the insert (215) being pluggable in the connecting groove (216-2).

2. The large strain pile testing equipment according to claim 1, characterized in that: The connecting assembly (2) further includes a driving member (22) disposed in the connecting seat (214), the driving member (22) including a lifting pin (221) sliding in the connecting seat (214), a first spring (222) being fixed in the lifting pin (221), the other end of the first spring (222) being fixed to the inner wall of the connecting seat (214), a circular arc groove (215-1) being provided on the surface of the insert (215), and an end of the lifting pin (221) being inserted into the circular arc groove (215-1).

3. The large strain pile testing equipment according to claim 2, characterized in that: The driving member (22) further comprises an extrusion plate (223) fixed to one side of the insert block (215); an extrusion cone (224) is fixed in the clamping seat (216); a magnetic ring (225) is fixed in the connecting seat (214); a metal sheet (226) is fixed in the clamping seat (216); and an extrusion surface (223-1) is provided on the extrusion plate (223).

4. The large strain pile testing equipment according to claim 3, characterized in that: The connecting assembly (2) further comprises a limiting member (23) disposed in the connecting seat (214), the limiting member (23) comprising a limiting seat (231) sliding in the connecting seat (214), a connecting rod (232) being fixed on the top of the limiting seat (231), and a connecting ring (233) being fixed on the top of the connecting rod (232).

5. The large strain pile testing equipment according to claim 4, characterized in that: The limiting member (23) further comprises a connecting rope (234) fixed to the top of the connecting ring (233), the other end of the connecting rope (234) being fixed to the bottom of the supporting plate (211), and a second spring (235) being fixed between the supporting plate (211) and the connecting plate (213).

6. The large strain pile testing equipment according to claim 5, characterized in that: The connecting assembly (2) further comprises a positioning member (24) arranged on the top of the connecting seat (214), the positioning member (24) comprising a support plate (241) fixed to the surface of the connecting ring (233), a movable plate (242) slidingly provided at the bottom of the support plate (241), and a positioning seat (243) fixed on the top of the movable plate (242).

7. The large strain pile testing equipment according to claim 6, characterized in that: The positioning member (24) further includes a slide rail (244) fixed to the bottom of the movable plate (242), a slide groove (214-1) is provided on the top of the connecting seat (214), the slide rail (244) slides in the slide groove (214-1), and an unlocking plate (245) is fixed to the top of the movable plate (242).

8. The large strain pile testing equipment according to claim 7, characterized in that: A power member (25) is provided on the top of the connecting seat (214), and the power member (25) includes an extrusion sleeve (251) sliding in the movable plate (242), a third spring (252) is fixed in the extrusion sleeve (251), and the other end of the third spring (252) is fixed to the inner wall of the movable plate (242).

9. The large strain pile testing equipment according to claim 8, characterized in that: The power member (25) further comprises a push plate (253) fixed to one side of the two extrusion sleeves (251), an electric push rod (254) being fixed to one side of the push plate (253), a mounting seat (255) being fixed to the electric push rod (254), and the mounting seat (255) being fixed to the top of the connecting seat (214) by means of bolts.

10. The large strain pile testing equipment according to claim 1 or 9, characterized in that: The main body assembly (1) further comprises a support seat (12) fixed on the surface of the support frame (11), and a hydraulic leg (13) is fixed on the support seat (12).

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