Static load testing instrument for pile resistance to uplift

Abstract

The present application relates to the technical fields of pile uplift test, and relates to a kind of static load test instrument of pile uplift resistance, including adjacent pile;The top of adjacent pile is provided with movable test pile, and movable test pile is fixed with the bottom of jack.By setting the structure of uplift pile, by rotating locking nut, locking nut and screw thread transmission, with the convergence of height adjusting mechanism two and height adjusting mechanism one, so that top support frame one, top support frame two fold to the middle, to keep stable, the bolt of locking block one and locking block two is also slowly tightened, so that top support frame one, top support frame two exert upward force on reserved reinforcement, so that reserved reinforcement is subjected to vertical force, prevent reserved reinforcement from being subjected to oblique tension, cause uneven stress phenomenon, finally make top support frame one, top support frame two converge to limit rod, reach the purpose of protecting uplift pile, successfully complete test and detection task.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pile uplift testing, in particular to a pile uplift static load testing instrument. BACKGROUND

[0002] Building engineering pile bearing capacity detection is a crucial link to ensure the construction quality of pile foundation engineering, and its accurate testing is directly related to the safety, normal use and durability of the upper main structure, building decoration and other building structures. The pile with vertical compression as the main load usually adopts static load test to detect its ultimate bearing capacity.

[0003] Traditional pile uplift static load testing usually adopts the method of stacking load or anchor pile, which has obvious defects. The method of stacking load needs a large amount of counterweight material, which is time-consuming and labor-consuming in transportation and unloading, and is limited by the site; the anchor pile method needs to set anchor piles in advance, which increases the construction cost and construction period, and the test results are easily affected by the bearing capacity of the anchor pile itself. Moreover, there are many ways to connect the single pile vertical uplift static load testing device and the tested pile, generally a welding method is needed to establish reliable connection with the test pile reinforcement. Due to the diversification of pile type, some problems will occur when the testing device and the tested pile reinforcement are connected.

[0004] For example, if the size of the pile type does not match the main beam type, it will cause part of the pile reinforcement to be subjected to oblique tension, which is difficult to ensure the uniformity of the test stress, and is easy to cause damage to the test pile, which cannot achieve the purpose of test detection. SUMMARY

[0005] (I) Technical problems solved

[0006] To solve the above technical problems, the present application provides a pile uplift static load testing instrument.

[0007] (II) Technical solutions

[0008] Based on this, the present application provides the following technical solutions: a pile uplift static load testing instrument, comprising adjacent piles;

[0009] The top of the adjacent pile is provided with a movable test pile, the movable test pile is fixed with the bottom of the jack, the jack is fixedly connected with the bottom of the main beam, and the bottom of the main beam is provided with an uplift pile structure;

[0010] The anti-pulling pile structure comprises an anti-pulling pile, reserved steel bars, a fixed steel ring one, a fixed steel ring two, a locking ring, a top support frame one, a top support frame two, a locking top support mechanism and a limiting rod, the anti-pulling pile is arranged in parallel with the adjacent pile, the top of the anti-pulling pile is circumferentially distributed with the reserved steel bars, the bottom of the fixed steel ring one is fixed with the anti-pulling pile, the top of the fixed steel ring two is fixed with the main beam, the locking ring is fixed with the top of the main beam, the locking top support mechanism is arranged in the middle of the fixed steel ring one and the fixed steel ring two, and the upper and lower sides of the locking top support mechanism are respectively clamped with the top support frame one and the top support frame two, and the top of the limiting rod is fixed with the fixed steel ring two.

[0011] Preferably, the fixed steel ring one and the fixed steel ring two are symmetrically arranged upward and downward, and the middle portions of the fixed steel ring one and the fixed steel ring two are provided with reserved holes, and the reserved steel bars respectively pass through the middle portions of the reserved holes of the fixed steel ring one and the fixed steel ring two.

[0012] Preferably, the top support frame one is arranged in an inclined manner, and two groups of the top support frame one are oppositely arranged along the left and right sides of the fixed steel ring two, the outer side of the fixed steel ring two is provided with a locking block one, the locking block one wraps the upper end of the top support frame one, and the inner side of the locking block one is bolted with the fixed steel ring two.

[0013] Preferably, the top support frame two is arranged in an inclined manner, and two groups of the top support frame two are oppositely arranged along the left and right sides of the fixed steel ring one, the outer side of the fixed steel ring one is provided with a locking block two, the locking block two wraps the upper end of the top support frame two, and the inner side of the locking block two is bolted with the fixed steel ring one, and the top support frame one and the top support frame two are symmetrically arranged upward and downward.

[0014] Preferably, the locking top support mechanism comprises a height adjusting mechanism one, a clamping structure, a locking structure, a screw rod and a height adjusting mechanism two, the left end of the height adjusting mechanism one is oppositely provided with the clamping structure upward and downward, the clamping structure is engaged with the top support frame one, the middle portion of the height adjusting mechanism one is provided with the locking structure, and the height adjusting mechanism one and the height adjusting mechanism two are symmetrically arranged.

[0015] Preferably, two groups of the screw rods are oppositely arranged along the front and rear sides of the height adjusting mechanism one and the height adjusting mechanism two, the screw rods sequentially pass through the height adjusting mechanism one and the height adjusting mechanism two, and the right end of the screw rod extends into the inner side of the locking structure, the height adjusting mechanism one and the height adjusting mechanism two are moved to the middle portion by the front and rear groups of the screw rods, so that the top support frame one and the top support frame two respectively apply upward and downward top support forces to the reserved steel bars, thereby ensuring that the reserved steel bars are vertically stressed upward, and achieving the purpose of protecting the anti-pulling pile and smoothly completing the test and detection task.

[0016] Preferably, the height adjustment mechanism includes a vertical plate, a slider, a movable plate, and a locking bolt. The movable plate is fixed to the right end of the clamping structure, the vertical plate is fixed to the right end of the slider, the slider is slidably engaged with the inner side of the right end of the movable plate, and the vertical plate is locked to the movable plate by the locking bolt, so that the relative position of the movable plate and the vertical plate can be adjusted.

[0017] Preferably, there are two sets of movable plates, and the movable plates are arranged opposite each other on the upper and lower sides of the left end of the vertical plate. The front and rear sides of the left end of the two sets of movable plates are provided with clamping structures. By adjusting the upper and lower positions of the two sets of movable plates, the clamping position of the clamping structure can be changed, which is convenient for dealing with the top support frame one and top support frame two of different heights.

[0018] Preferably, the clamping structure includes a connecting column, a positioning frame, a sliding rod, a clamping block, a top wheel, and a telescopic spring. The right end of the connecting column is fixed to the height adjustment mechanism. The connecting column is fixed to the front end of the positioning frame. The sliding rod is slidably engaged with the middle of the connecting column and the positioning frame. The sliding rod is fixed to the rear end of the clamping block. Top wheels are arranged opposite each other on the left and right sides of the front end of the positioning frame. The top wheels are in contact with the side walls of the clamping block. The sliding rod is fixed to the left end of the telescopic spring. The right end of the telescopic spring is fixedly connected to the connecting column.

[0019] Preferably, the locking structure includes a movable seat, a bearing, a locking nut, a receiving frame, and a guide seat. The movable seat is fixed to the right end of the height adjustment mechanism. A bearing is fixed to the inner side of the right end of the movable seat. The bearing is movably connected to the left end of the locking nut. The left end of the movable seat is fixed to the receiving frame. The middle part of the receiving frame is fixedly connected to the guide seat.

[0020] (III) Beneficial Effects

[0021] Compared with the prior art, the present invention provides a static load tester for pile pull-out resistance, which has the following advantages:

[0022] This static load tester for pile pull-out resistance uses a pull-out pile structure. By rotating the locking nut, the locking nut and the screw thread drive together. As the height adjustment mechanism 1 and height adjustment mechanism 2 approach each other, the top support frame 1 and top support frame 2 retract towards the center. To maintain stability, the bolts of locking block 1 and locking block 2 are also slowly tightened. This causes the top support frame 1 and top support frame 2 to apply an upward force to the reserved steel bar, so that the reserved steel bar is subjected to a vertical upward force, preventing the reserved steel bar from being subjected to oblique tension and causing uneven stress. Finally, the top support frame 1 and top support frame 2 approach the limit rod, thus protecting the pull-out pile and successfully completing the test and inspection task. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the planar structure of the anti-uplift pile structure of the present invention;

[0025] Figure 3 This is a top view of the locking ring structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the planar structure of the locking top support mechanism of the present invention;

[0027] Figure 5 This is a schematic diagram of a planar structure of the height adjustment mechanism of the present invention;

[0028] Figure 6 This is a three-dimensional structural diagram of the clamping structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the internal structure of the clamping structure of the present invention;

[0030] Figure 8 This is a schematic diagram of the internal structure of the locking structure of the present invention.

[0031] In the diagram: 1. Adjacent piles, 2. Movable test piles, 3. Jacks, 4. Main beams, 5. Tension-resistant pile structure;

[0032] 51. Anti-uplift foundation pile; 52. Reserved reinforcing bar; 53. Fixing steel ring one; 531. Locking block two; 54. Fixing steel ring two; 541. Locking block one; 55. Locking ring; 56. Top support frame one; 57. Top support frame two; 58. Locking top support mechanism; 59. Limiting rod.

[0033] 581. Height adjustment mechanism one; 582. Clamping structure; 583. Locking structure; 584. Screw; 585. Height adjustment mechanism two;

[0034] 5811, Vertical plate; 5812, Slider; 5813, Moving plate; 5814, Locking bolt;

[0035] 5821. Connecting column; 5822. Positioning frame; 5823. Slide rod; 5824. Clamping block; 5825. Top wheel; 5826. Telescopic spring.

[0036] 5831, movable seat; 5832, bearing; 5833, locking nut; 5834, support frame; 5835, guide seat. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figure 1 A static load tester for pile pull-out includes adjacent piles 1; a movable test pile 2 is provided on the top of the adjacent piles 1, the movable test pile 2 is fixed to the bottom of the jack 3, the jack 3 is fixedly connected to the bottom of the main beam 4, and a pull-out pile structure 5 is provided at the bottom of the main beam 4.

[0039] In this application, the jack 3 is a multi-stage hydraulic cylinder, which is an actuator that achieves long-stroke linear motion through a multi-stage sleeve-shaped piston rod. Its biggest feature is that the stroke can be several times that of a single-stage cylinder, while maintaining a compact retraction length. A displacement sensor (accuracy 0.01mm) and a strain gauge are installed on the jack 3, and it is connected to a fully automatic static load tester. The movable test pile 2 is designed according to the characteristics of the adjacent pile 1 and the layout of the test device. It is made of reinforced concrete prefabrication or high-strength steel processing according to the actual conditions. When reinforced concrete prefabrication is used, C50 concrete is used and it is cast in one go to ensure that the upper and lower surfaces are flat. If necessary, a whole steel plate can be laid. When high-strength steel processing is used, the type and quantity of I-beams are selected according to the specific size requirements or the stress of the test device. The principle of symmetry must be ensured during processing to control the uniform stress on the movable test pile 2.

[0040] Please see Figures 2-4A static load tester for pile pull-out resistance is disclosed. The pull-out pile structure 5 includes a pull-out pile 51, a reserved reinforcing bar 52, a first fixed steel ring 53, a second fixed steel ring 54, a locking ring 55, a first top support frame 56, a second top support frame 57, a locking top support mechanism 58, and a limiting rod 59. The pull-out pile 51 is arranged parallel to the adjacent pile 1. The top of the pull-out pile 51 is circumferentially distributed with reserved reinforcing bars 52. The bottom of the first fixed steel ring 53 is fixed to the pull-out pile 51, and the top of the second fixed steel ring 54 is fixed to the main beam. The four phases are fixed. The locking ring 55 is fixed to the top of the main beam 4. The locking top support mechanism 58 is set in the middle of the first fixed steel ring 53 and the second fixed steel ring 54. The upper and lower sides of the locking top support mechanism 58 are respectively clamped to the first top support frame 56 and the second top support frame 57. The top of the limiting rod 59 is fixed to the second fixed steel ring 54. The first fixed steel ring 53 and the second fixed steel ring 54 are symmetrically arranged vertically. The middle of the first fixed steel ring 53 and the second fixed steel ring 54 are both provided with reserved holes for reserved reinforcing bars 5. 2. The top support frame 56 is inclined and has two sets, arranged opposite each other along the left and right sides of the fixed steel ring 54. A locking block 541 is provided on the outer side of the fixed steel ring 54, covering the upper end of the top support frame 56. The inner side of the locking block 541 is bolted to the fixed steel ring 54. The top support frame 57 is also inclined. Two sets are provided, arranged opposite each other on the left and right sides of the fixing steel ring 53. The outer side of the fixing steel ring 53 is provided with a locking block 531, which wraps around the upper end of the top support frame 57. The inner side of the locking block 531 is bolted to the fixing steel ring 53. The top support frame 56 and the top support frame 57 are arranged symmetrically from top to bottom. The front and rear sides of the top support frame 56 and the top support frame 57 are provided with protrusions to facilitate the clamping structure 582 to clamp and fix with the protrusions.

[0041] In some embodiments, the locking top support mechanism 58 includes a height adjustment mechanism 1 581, a clamping structure 582, a locking structure 583, a screw 584, and a height adjustment mechanism 2 585. The clamping structure 582 is arranged opposite to the upper and lower sides of the left end of the height adjustment mechanism 1 581, and the clamping structure 582 engages with the top support frame 1 56. The locking structure 583 is arranged in the middle of the height adjustment mechanism 1 581. The height adjustment mechanism 1 581 and the height adjustment mechanism 2 585 are symmetrically arranged. Two sets of screws 584 are provided, and the screws 584 are arranged opposite to each other along the front and rear sides of the height adjustment mechanism 1 581 and the height adjustment mechanism 2 585. The screws 584 sequentially pass through the height adjustment mechanism 1 581 and the height adjustment mechanism 2 585, and the right end of the screws 584 extends into the inner side of the locking structure 583. The height adjustment mechanisms 581 and 585 are brought closer together to the center, so that the top support frame 56 and 57 apply top support forces on the reserved steel bar 52 from both the top and bottom sides. This ensures that the reserved steel bar 52 is subjected to vertical upward force, thereby protecting the anti-uplift pile 51 and successfully completing the test and inspection task. The left end of the screw 584 is provided with a limiting seat, which is embedded in the left end of the height adjustment mechanism 585 and supports the left end of the height adjustment mechanism 585. The top support frame 56 and 57 are symmetrically arranged in a figure-eight shape, respectively wrapping the upper left and right sides of the fixed steel ring 54 and the upper left and right sides of the fixed steel ring 53. The reserved steel bar 52 refers to the steel bar that is pre-embedded during the construction process for subsequent structural connection or functional expansion. It is mainly used to transfer loads and enhance the overall structure.

[0042] Please see Figures 5-7 A static load tester for pile pull-out includes a height adjustment mechanism 581 comprising a vertical plate 5811, a slider 5812, a movable plate 5813, and a locking bolt 5814. The movable plate 5813 is fixed to the right end of a clamping structure 582, and the vertical plate 5811 is fixed to the right end of the slider 5812. The slider 5812 slides within the right inner side of the movable plate 5813. The vertical plate 5811 is locked to the movable plate 5813 by the locking bolt 5814. The relative positions of the movable plate 5813 and the vertical plate 5811 are adjusted. There are two sets of movable plates 5813, and the movable plates 5813 are arranged opposite each other on the upper and lower sides of the left end of the vertical plate 5811. The front and rear sides of the left end of the two sets of movable plates 5813 are equipped with clamping structures 582. By adjusting the upper and lower positions of the two sets of movable plates 5813, the clamping position of the clamping structure 582 can be changed, which is convenient for dealing with the top support frame 1 56 and top support frame 2 57 of different heights.

[0043] In some embodiments, the clamping structure 582 includes a connecting post 5821, a positioning frame 5822, a slide rod 5823, a clamping block 5824, a top wheel 5825, and a telescopic spring 5826. The right end of the connecting post 5821 is fixed to the height adjustment mechanism 581, and the connecting post 5821 is fixed to the front end of the positioning frame 5822. The slide rod 5823 is slidably engaged with the middle of the connecting post 5821 and the positioning frame 5822, and the slide rod 5823 is fixed to the rear end of the clamping block 5824. The front end of the positioning frame 5822 is also fixed to the middle end of the positioning frame 5824. Top wheels 5825 are arranged opposite each other on the left and right sides. Top wheels 5825 are in contact with the side wall of clamping block 5824. Slide rod 5823 is fixed to the left end of telescopic spring 5826. The right end of telescopic spring 5826 is fixedly connected to connecting column 5821. Locking bolt 5814 is a high-strength bolt. High-strength bolt is a key connecting element in the engineering field. Its core characteristic is that it achieves structural stability through the synergistic effect of preload and friction. Telescopic spring 5826 is an energy storage element that achieves length change through elastic deformation.

[0044] Please see Figure 8 A static load tester for pile pull-out includes a locking structure 583 comprising a movable seat 5831, a bearing 5832, a locking nut 5833, a support frame 5834, and a guide seat 5835. The movable seat 5831 is fixed to the right end of the height adjustment mechanism 581. The bearing 5832 is fixed to the inner side of the right end of the movable seat 5831. The bearing 5832 is movably connected to the left end of the locking nut 5833. The left end of the movable seat 5831 is fixed to the support frame 5834. The middle part of the support frame 5834 is fixedly connected to the guide seat 5835. The bearing 5832 is a core component in mechanical equipment that supports the rotating body, reduces the coefficient of friction, and ensures rotational accuracy, enabling the locking nut 5833 to rotate smoothly. The locking nut 5833 is a special fastener that prevents the threaded connection from loosening and is threadedly engaged with the screw 584. The guide seat 5835 is used to guide the screw 584.

[0045] In summary, when using it, first find a suitable adjacent pile 1, then place the movable test pile 2 on top of the adjacent pile 1. If necessary, a whole steel plate can be laid on the top of both the movable test pile 2 and the adjacent pile 1. Then, install the jack 3 on top of the movable test pile 2.

[0046] Next, fix the first steel ring 53 on the top of the tensile pile 51, and make the reserved steel bar 52 pass through the middle of the first steel ring 53. At the same time, fix the reserved steel bar 52 to the first steel ring 53 through the anchor. Similarly, install the second steel ring 54.

[0047] Then, the top support frame 1 56 and the top support frame 2 57 are fastened to the left and right sides of the fixing steel ring 2 54 and the fixing steel ring 1 53 respectively, and the top support frame 1 56 and the top support frame 2 57 are arranged symmetrically in a figure-eight shape. At the same time, the locking block 1 541 and the locking block 2 531 are used to lock and position the top support frame 1 56 and the top support frame 2 57 respectively.

[0048] After locking, the height adjustment mechanism 2 585 and the height adjustment mechanism 1 581 encircle the middle of the top support frame 1 56 and the top support frame 2 57. The clamping structure 582 clamps the top support frame 1 56 and the top support frame 2 57 respectively. The screw 584 passes through the middle of the height adjustment mechanism 2 585 and the height adjustment mechanism 1 581, so that the right end of the screw 584 passes through the guide seat 5835 and extends into the locking nut 5833. Then, the locking nut 5833 is rotated clockwise, so that the locking nut 5833 and the screw 584 are threadedly driven, thereby tightening the height adjustment mechanism 2 585 and the height adjustment mechanism 1 581. During the tightening process of the height adjustment mechanism 2 585 and the height adjustment mechanism 1 581;

[0049] As the top support frame 1 56 and the top support frame 2 57 clamp the clamping structure 582 set at their upper ends, as the protrusions at the upper ends of the top support frame 1 56 and the top support frame 2 57 are embedded in the inner side of the clamping block 5824, the clamping block 5824 is driven to move to the right end, so that the clamping block 5824 is tightened towards the middle through the support of the top wheel 5825, and the protrusion is firmly clamped. When the clamping block 5824 moves, it will drive the slide rod 5823 to move to the right end, and press the telescopic spring 5826 to retract.

[0050] As the height adjustment mechanism 2 585 and the height adjustment mechanism 1 581 approach each other, the top support frame 1 56 and the top support frame 2 57 retract towards the center. To maintain stability, the bolts of the locking block 1 541 and the locking block 2 531 on the other side of the top support frame 1 56 and the top support frame 2 57 are also slowly tightened. This causes the top support frame 1 56 and the top support frame 2 57 to apply an upward force to the reserved steel bar 52, so that the reserved steel bar 52 is subjected to a vertical upward force, preventing the reserved steel bar 52 from being subjected to oblique tension and causing uneven force. Finally, the top support frame 1 56 and the top support frame 2 57 are brought together to the limit rod 59.

[0051] After the operation is completed, fix the main beam 4 on the top of the fixed steel ring 54, set the locking ring 55 on the main beam 4, and fix the reserved steel bar 52 again to prevent the reserved steel bar 52 from loosening.

[0052] Then, the top of the jack 3 can be attached and fixed to the bottom of the main beam 4. A constant or slowly increasing static load is applied by the jack 3 to determine the bearing capacity, deformation characteristics and failure mode of the pull-out pile 51, complete the standardized test, and record and display the data through a fully automatic static load tester, automatically collecting displacement, load and other data.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A static load tester for pile pull-out resistance, characterized in that: Including adjacent piles (1); The top of the adjacent pile (1) is provided with a movable test pile (2), the movable test pile (2) is fixed to the bottom of the jack (3), the jack (3) is fixedly connected to the bottom of the main beam (4), and the bottom of the main beam (4) is provided with an anti-pull-out foundation pile structure (5). The anti-uplift pile structure (5) includes an anti-uplift pile (51), reserved reinforcing bars (52), a first fixed steel ring (53), a second fixed steel ring (54), a locking ring (55), a first top support frame (56), a second top support frame (57), a locking top support mechanism (58), and a limiting rod (59). The anti-uplift pile (51) is arranged parallel to the adjacent pile (1). Reserved reinforcing bars (52) are circumferentially distributed on the top of the anti-uplift pile (51). The bottom of the first fixed steel ring (53) is parallel to the top of the pile. The anti-uplift pile (51) is fixed, the top of the second fixed steel ring (54) is fixed to the main beam (4), the locking ring (55) is fixed to the top of the main beam (4), the locking top support mechanism (58) is set in the middle of the first fixed steel ring (53) and the second fixed steel ring (54), and the upper and lower sides of the locking top support mechanism (58) are respectively clamped to the first top support frame (56) and the second top support frame (57), and the top of the limiting rod (59) is fixed to the second fixed steel ring (54); The first fixed steel ring (53) and the second fixed steel ring (54) are arranged symmetrically above and below each other, and a reserved hole is opened in the middle of the first fixed steel ring (53) and the second fixed steel ring (54). The reserved steel bar (52) passes through the middle of the reserved hole of the first fixed steel ring (53) and the second fixed steel ring (54). The top support frame (56) is set at an angle, and there are two sets of top support frames (56) set opposite each other on the left and right sides of the fixing steel ring (54). The outer side of the fixing steel ring (54) is provided with a locking block (541). The locking block (541) wraps around the upper end of the top support frame (56), and the inner side of the locking block (541) is bolted to the fixing steel ring (54). The second top support frame (57) is set at an inclination, and there are two sets of the second top support frame (57), which are set opposite to each other on the left and right sides of the first fixing steel ring (53). The second locking block (531) is set on the outer side of the first fixing steel ring (53). The second locking block (531) wraps around the upper end of the second top support frame (57), and the inner side of the second locking block (531) is bolted to the first fixing steel ring (53). The first top support frame (56) and the second top support frame (57) are set symmetrically from top to bottom. The locking top support mechanism (58) includes a height adjustment mechanism one (581), a clamping structure (582), a locking structure (583), a screw (584), and a height adjustment mechanism two (585). The left end of the height adjustment mechanism one (581) is provided with clamping structures (582) on both the upper and lower sides. The clamping structures (582) are engaged with the top support frame one (56). The middle part of the height adjustment mechanism one (581) is provided with a locking structure (583). The height adjustment mechanism one (581) and the height adjustment mechanism two (585) are symmetrically arranged. Two sets of screws (584) are provided, and the screws (584) are arranged opposite to each other on the front and rear sides of the height adjustment mechanism one (581) and the height adjustment mechanism two (585). The screws (584) pass through the height adjustment mechanism one (581) and the height adjustment mechanism two (585), and the right end of the screws (584) extends into the inside of the locking structure (583).

2. The pile pull-out static load tester according to claim 1, characterized in that: The height adjustment mechanism (581) includes a vertical plate (5811), a slider (5812), a movable plate (5813), and a locking bolt (5814). The movable plate (5813) is fixed to the right end of the clamping structure (582). The vertical plate (5811) is fixed to the right end of the slider (5812). The slider (5812) slides inside the right end of the movable plate (5813). The vertical plate (5811) is locked and fixed to the movable plate (5813) by the locking bolt (5814).

3. The static load tester for pile pull-out as described in claim 2, characterized in that: Two sets of movable plates (5813) are provided, and the movable plates (5813) are arranged opposite each other on the upper and lower sides of the left end of the vertical plate (5811). Clamping structures (582) are provided on the front and rear sides of the left end of the two sets of movable plates (5813).

4. The pile pull-out static load tester according to claim 1, characterized in that: The clamping structure (582) includes a connecting column (5821), a positioning frame (5822), a slide rod (5823), a clamping block (5824), a top wheel (5825), and a telescopic spring (5826). The right end of the connecting column (5821) is fixed to the height adjustment mechanism (581), and the connecting column (5821) is fixed to the front end of the positioning frame (5822). The slide rod (5823) is connected to both the connecting column (5821) and the positioning frame. The middle part of (5822) is slidably engaged, the slide rod (5823) is fixed to the rear end of the clamping block (5824), the front left and right sides of the positioning frame (5822) are provided with top wheels (5825), the top wheels (5825) are in contact with the side wall of the clamping block (5824), the slide rod (5823) is fixed to the left end of the telescopic spring (5826), and the right end of the telescopic spring (5826) is fixedly connected to the connecting column (5821).

5. The pile pull-out static load tester according to claim 1, characterized in that: The locking structure (583) includes a movable seat (5831), a bearing (5832), a locking nut (5833), a support frame (5834), and a guide seat (5835). The movable seat (5831) is fixed to the right end of the height adjustment mechanism (581). The bearing (5832) is fixed to the inner side of the right end of the movable seat (5831). The bearing (5832) is movably connected to the left end of the locking nut (5833). The left end of the movable seat (5831) is fixed to the support frame (5834). The middle part of the support frame (5834) is fixedly connected to the guide seat (5835).

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