A pile foundation anchor rod uplift testing device

Abstract

The present application relates to a kind of test devices, especially a kind of pile anchor rod anti-pulling test device, including air cylinder, moving ring, first elastic member and clamping block etc., moving ring is movably arranged in the air cylinder, multiple first elastic members are connected between the top of moving ring and the top of air cylinder, the inner lower portion of moving ring is provided with slope, the slope gradually extends to the center position of moving ring from bottom to top, multiple clamping blocks for clamping anchor rod are movably arranged on the slope of moving ring with uniform spacing.The air pump of the present application can inject air into the air cylinder, the air pushes moving ring to move downward, moving ring extrudes clamping block, so that clamping block is closed, anchor rod is clamped, moving ring exerts downward pulling force on anchor rod, anchor rod is tested for anti-pulling, top rod can be topped in construction position, avoid air cylinder to be inclined, so that test result is more accurate, and through the action of second elastic member, top rod can adapt to different construction positions.

Description

Technical Field

[0001] This invention relates to a testing device, and more particularly to a testing device for the pull-out resistance of pile foundation anchor rods. Background Technology

[0002] When constructing high-rise buildings, pile foundation engineering is required to provide support for the high-rise buildings. Anchor rods are an important part of pile foundation engineering, which can improve the bearing capacity of the pile foundation. After the anchor rods are installed, pull-out tests need to be carried out to determine whether the anchor rods are stable.

[0003] Patent CN114813335A discloses a pile foundation anchor pull-out detection device and its detection method, including a detection frame, a loading device and a displacement measuring instrument. The detection frame has a through hole and a support block is hinged to the detection frame. An adjusting rod is slidably connected to the detection frame along the axial direction of the anchor rod in the through hole. The adjusting rod has several slots and a support block is hinged to one end of the adjusting rod. A positioning ring is slidably connected to the detection frame and a positioning element is provided on the positioning ring.

[0004] This patent allows the device to be supported at the construction position using support block one and support block two. The support position of support block two can be adjusted using an adjusting rod, so that the force direction of the loading device and the central axis of the anchor rod are in the same direction. However, the slots are evenly spaced, with a certain distance between adjacent slots. When the force direction of the loading device and the central axis of the anchor rod are in the same direction, if the sealing part does not correspond to the slot, the sealing part cannot be inserted into the slot, making it impossible to fix the adjusting rod and move it to any position, thus making it difficult to adapt to different construction positions. Summary of the Invention

[0005] To overcome the drawback that if the sealing part does not correspond to the slot, the sealing part cannot be inserted into the slot, resulting in the adjustment rod being unable to be fixed and difficult to move to any position, thus making it difficult to adapt to different construction positions, the purpose of this invention is to provide a pile foundation anchor pull-out test device that can adapt to different construction positions.

[0006] The technical solution is as follows: A pile foundation anchor pull-out testing device includes an air cylinder, a moving ring, a first elastic element, clamping blocks, an air pump, a one-way air inlet pipe, an air outlet pipe, a jacking mechanism, a support mechanism, and a testing mechanism. The moving ring is sealed and slidably disposed inside the air cylinder. Multiple first elastic elements are connected between the top of the moving ring and the top of the air cylinder. An inclined surface is provided in the lower part of the moving ring, gradually extending upwards towards the center of the moving ring. Multiple clamping blocks for clamping the anchor are evenly spaced and slidably disposed on the inclined surface of the moving ring. A one-way air inlet pipe is connected to the air pump and is connected to the upper part of the air cylinder, and the one-way air inlet pipe and the air cylinder are in communication. An air outlet pipe is connected to the upper part of the air cylinder. The air cylinder is equipped with a jacking mechanism for supporting the construction position, a support mechanism for supporting the clamping blocks, and a testing mechanism for detecting the tensile force applied to the anchor.

[0007] Furthermore, the supporting mechanism includes an annular frame, a guide plate, a top rod, a second elastic element, and a fixing component. The top of the air cylinder is connected to the annular frame, and the guide plate is connected inside the annular frame. The top of the annular frame is evenly spaced and has four rings of top rods for supporting the working position. The bottom end of the top rod and the top of the guide plate are connected by a second elastic element. The annular frame is provided with a fixing component for fixing the top rod.

[0008] Furthermore, the fixing assembly includes an open clamping ring, a push frame, a rotating ring, and first wedge blocks. Three sets of open clamping rings for clamping the push rods are slidably arranged at the top of the annular frame. Each set of open clamping rings is located between two adjacent push rods, and each set has two open clamping rings. Each open clamping ring has a bevel. The open clamping rings are made of stainless steel. A push frame for squeezing the open clamping rings is slidably arranged on the guide plate. The top of the push frame contacts the bevel on the open clamping ring. A rotating ring for squeezing the push frame upwards is rotatably connected to the bottom of the annular frame. The top of the rotating ring contacts the bottom of the push frame. Four first wedge blocks are evenly spaced around the outside of the rotating ring in a circumferential direction. Four bevels are evenly spaced around the bottom of the annular frame in a circumferential direction. The bevels on the first wedge blocks contact the bevels on the annular frame.

[0009] Furthermore, the support mechanism includes a guide ring, an internal threaded sleeve, an external threaded sleeve, and support blocks. The bottom of the air cylinder is connected to the guide ring, and the bottom of the air cylinder is rotatably connected to the internal threaded sleeve. The guide ring is located inside the internal threaded sleeve, and the internal threaded sleeve is provided with an external threaded sleeve. Multiple support blocks for supporting the clamping blocks are evenly spaced around the inner side of the external threaded sleeve in the circumferential direction. The number of support blocks is the same as the number of clamping blocks. The support blocks and the guide ring are slidably connected, and the top of the support block and the bottom of the clamping block are in contact.

[0010] Furthermore, the testing mechanism includes a tension sensor, a display, and a controller. A tension sensor is connected between the top of the moving ring and the top of the air cylinder. The display and controller are connected to the air pump. Both the tension sensor and the display are electrically connected to the controller.

[0011] Furthermore, it also includes a pushing mechanism for pushing the first wedge block to move upward. The pushing mechanism includes a drive ring, contact rods, a second wedge block, and a third elastic element. The drive ring is connected to the outside of the rotating ring. The top of the drive ring has multiple oblique openings evenly spaced around the circumference. Multiple contact rods are slidably provided evenly spaced around the circumference on the outside of the annular frame. The number of contact rods is the same as the number of oblique openings. The bottom end of each contact rod is connected to a second wedge block. The second wedge block is located inside the oblique opening. The third elastic element connects the annular frame and the second wedge block.

[0012] Furthermore, it also includes a placement mechanism, which includes a first connecting ring, a second connecting ring, and a placement rack. The first connecting ring is connected to the outside of the annular frame, the second connecting ring is connected to the outside of the air cylinder, and multiple placement racks are connected between the second connecting ring and the first connecting ring.

[0013] Furthermore, it also includes a correction mechanism, which includes a first level and a second level, with the first level and the second level connected to a mounting frame. The first level is set horizontally, and the second level is set vertically.

[0014] The present invention has the following advantages: 1. The air pump of the present invention can inject air into the air cylinder, the air pushes the moving ring to move downward, the moving ring squeezes the clamping block, causing the clamping block to close and clamp the anchor rod, the moving ring applies a downward pulling force to the anchor rod, and the anchor rod is tested for pull-out resistance. The top rod can be supported at the construction position to prevent the air cylinder from tilting, making the test results more accurate. Furthermore, through the action of the second elastic element, the top rod can adapt to different construction positions.

[0015] 2. When the air pump is pushed upward, the contact rod will also move upward. When the contact rod contacts the working position, the contact rod stops moving upward, and the drive ring continues to move upward. Under the action of the inclined hole and the second wedge block, the drive ring rotates counterclockwise. The drive ring drives the rotating ring to rotate counterclockwise, quickly clamping the top rod, making it more convenient to use.

[0016] 3. The placement frame can support the entire device, preventing the top rod from contacting the ground and avoiding pressure between the top rod and the ground, thus preventing the top rod from bending.

[0017] 4. By observing the first or second level, it can be determined whether the air cylinder is in a vertical or horizontal state, avoiding the tilting force that would be generated when pulling the anchor rod due to the tilting of the air cylinder, thus making the test results more accurate. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2This is a three-dimensional structural diagram of the first elastic element and the clamping block of the present invention.

[0020] Figure 3 This is a schematic diagram of the first three-dimensional structure of the supporting mechanism of the present invention.

[0021] Figure 4 This is a schematic diagram of a second three-dimensional structure of the supporting mechanism of the present invention.

[0022] Figure 5 This is a schematic diagram of the third three-dimensional structure of the supporting mechanism of the present invention.

[0023] Figure 6 This is a schematic diagram of the fourth three-dimensional structure of the supporting mechanism of the present invention.

[0024] Figure 7 This is a three-dimensional structural diagram of the open clamping ring of the present invention.

[0025] Figure 8 This is a three-dimensional structural diagram of the push frame of the present invention.

[0026] Figure 9 This is a three-dimensional structural diagram of the support mechanism of the present invention.

[0027] Figure 10 This is a schematic diagram of the first three-dimensional structure of the testing mechanism of the present invention.

[0028] Figure 11 This is a schematic diagram of the second three-dimensional structure of the detection mechanism of the present invention.

[0029] Figure 12 This is a schematic diagram of the first three-dimensional structure of the driving mechanism of the present invention.

[0030] Figure 13 This is a schematic diagram of a second three-dimensional structure of the driving mechanism of the present invention.

[0031] Figure 14 This is a three-dimensional structural diagram of the placement mechanism and the correction mechanism of the present invention.

[0032] Reference numerals: 1-Air cylinder, 2-Moving ring, 3-First elastic element, 4-Clamping block, 5-Air pump, 6-One-way air inlet pipe, 7-Air outlet pipe, 8-Holding mechanism, 81-Annular frame, 82-Guide plate, 83-Push rod, 84-Second elastic element, 85-Open clamping ring, 86-Push frame, 87-Rotating ring, 88-First wedge block, 9-Support mechanism, 91-Guide ring, 92-Internal threaded sleeve, 93-External threaded sleeve, 94-Support Block, 10-Detection mechanism, 101-Tension sensor, 102-Display, 103-Controller, 11-Pushing mechanism, 111-Drive ring, 112-Angled opening, 113-Contact rod, 114-Second wedge block, 115-Third elastic element, 12-Placement mechanism, 121-First connecting ring, 122-Second connecting ring, 123-Placement frame, 13-Correction mechanism, 131-First level, 132-Second level. Detailed Implementation

[0033] The embodiments of the present invention will be described below with reference to the accompanying drawings.

[0034] Example 1

[0035] A pile foundation anchor pull-out test device, such as Figures 1-11 As shown, the device includes an air cylinder 1, a moving ring 2, first elastic elements 3, a clamping block 4, an air pump 5, a one-way air inlet pipe 6, an air outlet pipe 7, a supporting mechanism 8, a supporting mechanism 9, and a detection mechanism 10. The moving ring 2 is slidably sealed inside the air cylinder 1. Four first elastic elements 3, which are springs, are evenly spaced between the top of the moving ring 2 and the top of the air cylinder 1. An inclined surface is provided in the lower part of the moving ring 2, gradually extending upwards towards the center of the moving ring 2. Three sliding elements are evenly spaced on the inclined surface of the moving ring 2. The clamping block 4 and the moving ring 2 can squeeze the clamping block 4 to close it and clamp the anchor rod. The top of the air pump 5 is connected to a one-way air inlet pipe 6, which is connected to the upper left side of the air cylinder 1 and is connected to the air cylinder 1. The upper right side of the air cylinder 1 is connected to an air outlet pipe 7. The air cylinder 1 is equipped with a supporting mechanism 8, which is used to support the construction position. The air cylinder 1 is equipped with a support mechanism 9, which is used to support the clamping block 4. The air cylinder 1 is equipped with a detection mechanism 10, which is used to detect the tension applied to the anchor rod.

[0036] like Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the supporting mechanism 8 includes an annular frame 81, a guide plate 82, a top rod 83, a second elastic element 84, and a fixing assembly. The top of the air cylinder 1 is connected to the annular frame 81, and the guide plate 82 is connected inside the annular frame 81. The top of the annular frame 81 is provided with four rings of top rods 83 at even intervals. The top rods 83 are supported at the construction position to prevent the air cylinder 1 from tilting. The bottom end of the top rod 83 and the top of the guide plate 82 are connected by the second elastic element 84, which is a spring. The annular frame 81 is provided with a fixing assembly for fixing the top rods 83.

[0037] like Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the fixing assembly includes an open clamping ring 85, a push frame 86, a rotating ring 87, and a first wedge block 88. Three sets of open clamping rings 85 are slidably arranged at the top of the annular frame 81. Each set of open clamping rings 85 is located between two adjacent top rods 83, and each set has two open clamping rings 85. Each open clamping ring 85 has a bevel. The open clamping rings 85 are made of stainless steel and have good elastic deformation capability. The push frame 86 is slidably arranged on the guide plate 82. The top of the push frame 86 and the open clamping rings 85... The inclined surfaces are in contact. The bottom of the annular frame 81 is rotatably connected to a rotating ring 87. The top of the rotating ring 87 is in contact with the bottom of the push frame 86. The rotating ring 87 can squeeze the push frame 86 to move upward. The push frame 86 can squeeze the open clamping ring 85, so that the open clamping ring 85 clamps the top rod 83. Four first wedge blocks 88 are evenly spaced around the outside of the rotating ring 87 in the circumferential direction. The bottom of the annular frame 81 is provided with four inclined surfaces evenly spaced around the circumferential direction. The inclined surfaces on the first wedge blocks 88 are in contact with the inclined surfaces on the annular frame 81.

[0038] like Figure 1 and Figure 9 As shown, the support mechanism 9 includes a guide ring 91, an internal threaded sleeve 92, an external threaded sleeve 93, and support blocks 94. The bottom of the air cylinder 1 is connected to the guide ring 91, and the bottom of the air cylinder 1 is rotatably connected to the internal threaded sleeve 92. The guide ring 91 is located inside the internal threaded sleeve 92. The internal threaded sleeve 92 is provided with an external threaded sleeve 93. Three support blocks 94 are evenly spaced around the inner side of the external threaded sleeve 93 in the circumferential direction. The support blocks 94 and the guide ring 91 are slidably connected. The top of the support block 94 contacts the bottom of the clamping block 4. The support block 94 is used to support the clamping block 4.

[0039] like Figure 1 , Figure 10 and Figure 11As shown, the detection mechanism 10 includes a tension sensor 101, a display 102, and a controller 103. The tension sensor 101 is connected between the top of the moving ring 2 and the top of the inner cylinder 1. The display 102 is connected to the rear side of the top of the air pump 5, and the controller 103 is connected to the front side of the air pump 5. The tension sensor 101 and the display 102 are both electrically connected to the controller 103.

[0040] The worker places the movable ring 2 onto the anchor rod, then rotates the inner threaded sleeve 92 clockwise. The inner threaded sleeve 92 drives the outer threaded sleeve 93 upward, which in turn drives the support block 94 upward. The support block 94 pushes the clamping block 4 upward, which moves upward along the inclined surface of the movable ring 2, causing the clamping block 4 to close and contact the anchor rod, thus positioning the anchor rod at the center of the movable ring 2. Then, the worker pushes the air cylinder 1 upward, causing the top rod 83 to move upward. When the top rod 83 contacts the construction position, it stops moving. The worker continues to push the air cylinder 1 upward, compressing the second elastic element 84. After the top rod 83 is fully pressed against the construction position, the worker stops pushing the air cylinder 1 upward and then rotates the rotating ring 87 counterclockwise. The rotating ring 87 drives... The first wedge block 88 rotates counterclockwise and moves upward along the inclined surface on the annular frame 81, causing the rotating ring 87 to press the pushing frame 86 upward. The pushing frame 86 presses the open clamping ring 85, causing the open clamping ring 85 to deform and clamp the top rod 83. Subsequently, the first wedge block 88 disengages from the inclined surface on the annular frame 81, allowing the pushing frame 86 to continuously press the open clamping ring 85, which in turn clamps the top rod 83. The top rod 83 is held in place at the construction position, preventing the air cylinder 1 from tilting and making the test results more accurate. Furthermore, the second elastic element 84 allows the top rod 83 to adapt to different construction positions. Then, the operator starts the air pump 5, and air enters the air cylinder 1 through the one-way air inlet pipe 6, propelling the cylinder 1. As ring 2 moves downward, the first elastic element 3 stretches, and the support block 94 supports the clamping block 4, preventing it from moving downward. The moving ring 2 squeezes the clamping block 4, causing it to close and clamp the anchor rod. The moving ring 2 continues to move downward, applying a downward pulling force to the anchor rod and performing a pull-out test. The tension sensor 101 detects the pulling force applied by the moving ring 2 and transmits the signal to the controller 103. The controller 103 displays the data on the display 102, allowing the operator to see the pulling force applied to the anchor rod. When the pulling force applied to the anchor rod reaches a predetermined value, the air pump 5 is turned off, and the air outlet pipe 7 is opened. The air in the air cylinder 1 is discharged through the air outlet pipe 7, and the moving ring 2 moves upward under the action of the first elastic element 3. Ring 2 no longer presses against clamping block 4, clamping block 4 loosens the anchor rod, and then the vent pipe 7 is closed. Then, the inner threaded sleeve 92 is rotated counterclockwise. The inner threaded sleeve 92 drives the outer threaded sleeve 93 to move downward, and the outer threaded sleeve 93 drives the support block 94 to move downward. The support block 94 no longer supports clamping block 4, and clamping block 4 moves downward and opens under its own weight. Clamping block 4 and anchor rod are no longer in contact, and the worker can remove the moving ring 2 from the anchor rod. Then, the rotating ring 87 is rotated clockwise, and the rotating ring 87 drives the first wedge block 88 to rotate clockwise. The first wedge block 88 contacts the inclined surface on the annular frame 81, and then the first wedge block 88 continues to rotate clockwise and move downward. The rotating ring 87 no longer presses against the pushing frame 86, and the pushing frame 86 moves downward under its own weight.The push frame 86 stops pressing the open clamping ring 85, and the open clamping ring 85 returns to its original state, releasing the push rod 83. Under the action of the second elastic element 84, the push rod 83 moves upward. The operator then measures the displacement of the anchor rod to determine its pull-out resistance.

[0041] Example 2

[0042] Based on Example 1, such as Figure 1 , Figure 12 and Figure 13 As shown, it also includes a pushing mechanism 11 for pushing the first wedge block 88 upward. The pushing mechanism 11 includes a drive ring 111, contact rods 113, second wedge blocks 114 and a third elastic element 115. The drive ring 111 is connected to the outside of the rotating ring 87. The top of the drive ring 111 has four oblique openings 112 evenly spaced around the circumference. Four contact rods 113 are slidably provided on the outside of the annular frame 81 evenly spaced around the circumference. The bottom end of each contact rod 113 is connected to a second wedge block 114. The four second wedge blocks 114 are respectively located in the four oblique openings 112. The outside of each contact rod 113 is fitted with a third elastic element 115. The two ends of the third elastic element 115 are respectively connected to the annular frame 81 and the second wedge block 114. The third elastic element 115 is a spring.

[0043] When the worker pushes the air cylinder 1 upward, the contact rod 113 also moves upward. After the top rod 83 is fully pressed against the construction position, the contact rod 113 will also be in contact with the construction position. The contact rod 113 and the second wedge block 114 stop moving upward, while the annular frame 81 and the drive ring 111 continue to move upward. The third elastic element 115 stretches, and under the action of the inclined opening 112 and the second wedge block 114, the drive ring 111 rotates counterclockwise. The drive ring 111 drives the rotating ring 87 to rotate counterclockwise, clamping the top rod 83. This allows the top rod 83 to be clamped quickly, making it more convenient to use. When the worker removes the moving ring 2 from the anchor rod, the contact rod 113 is no longer in contact with the construction position. The second wedge block 114 moves upward under the action of the third elastic element 115, and then the drive ring 111 rotates clockwise, causing the rotating ring 87 to rotate clockwise, releasing the top rod 83.

[0044] like Figure 1 and Figure 14 As shown, it also includes a placement mechanism 12, which includes a first connecting ring 121, a second connecting ring 122 and a placement rack 123. The upper outer part of the annular frame 81 is connected to the first connecting ring 121, and the lower outer part of the air cylinder 1 is connected to the second connecting ring 122. Four placement racks 123 are evenly spaced between the second connecting ring 122 and the first connecting ring 121.

[0045] When not in use, the device can be supported by the mounting bracket 123, so that the top rod 83 does not contact the ground, thus preventing the top rod 83 from being squeezed by the ground and thus preventing the top rod 83 from bending.

[0046] like Figure 1 and Figure 14 As shown, it also includes a correction mechanism 13, which includes a first level 131 and a second level 132. The first level 131 and the second level 132 are connected to the front side of the placement frame 123. The first level 131 is located above the second level 132. The first level 131 is set horizontally, and the second level 132 is set vertically.

[0047] After the moving ring 2 is fitted onto the anchor rod, if the anchor rod is set vertically, the staff can observe the first level 131 to determine whether the air cylinder 1 is in a vertical state. If the air cylinder 1 is not in a vertical state, it can be corrected in time. If the anchor rod is set horizontally, the staff can observe the second level 132 to determine whether the air cylinder 1 is in a horizontal state. If the air cylinder 1 is not in a horizontal state, it can be corrected in time to avoid the air cylinder 1 tilting and causing tilting force when pulling the anchor rod, so as to make the test results more accurate.

[0048] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A pile foundation anchor pull-out test device, comprising an air cylinder (1), a movable ring (2), and first elastic elements (3), wherein the movable ring (2) is provided in a sealed sliding manner inside the air cylinder (1), and a plurality of first elastic elements (3) are connected between the top of the movable ring (2) and the top of the air cylinder (1), characterized in that: It also includes clamping blocks (4), air pump (5), one-way air inlet pipe (6), air outlet pipe (7), jacking mechanism (8), support mechanism (9) and detection mechanism (10). The lower part of the moving ring (2) is provided with an inclined surface, which gradually extends from the bottom to the center of the moving ring (2). Multiple clamping blocks (4) for clamping the anchor rod are evenly spaced and slidably provided on the inclined surface of the moving ring (2). One-way air inlet pipe (6) is connected to the air pump (5). One-way air inlet pipe (6) is connected to the upper part of the air cylinder (1), and one-way air inlet pipe (6) and air cylinder (1) are connected. Air outlet pipe (7) is connected to the upper part of the air cylinder (1). Jacking mechanism (8) for jacking at the construction position is provided on the air cylinder (1). Support mechanism (9) for supporting clamping blocks (4) is provided on the air cylinder (1). Detection mechanism (10) for detecting the tension applied to the anchor rod is provided on the air cylinder (1). The supporting mechanism (8) includes an annular frame (81), a guide plate (82), a top rod (83), a second elastic element (84), and a fixing component. The top of the air cylinder (1) is connected to the annular frame (81), and the guide plate (82) is connected inside the annular frame (81). The top of the annular frame (81) is evenly spaced and has four rings of top rods (83) for supporting the construction position. The bottom end of the top rod (83) and the top of the guide plate (82) are connected to the second elastic element (84). The annular frame (81) is provided with a fixing component for fixing the top rod (83). The fixing assembly includes an open clamping ring (85), a push frame (86), a rotating ring (87), and a first wedge block (88). Three sets of open clamping rings (85) for clamping the push rods (83) are slidably arranged at the top of the annular frame (81). Each set of open clamping rings (85) is located between two adjacent push rods (83), and each set has two open clamping rings (85). Each open clamping ring (85) has a bevel. The open clamping rings (85) are made of stainless steel. A guide plate (82) is slidably arranged to compress the open clamping rings (85). The push frame (86) has a top surface that contacts the inclined surface on the opening clamping ring (85). The bottom of the ring frame (81) is rotatably connected to a rotating ring (87) for squeezing the push frame (86) to move upward. The top of the rotating ring (87) contacts the bottom of the push frame (86). Four first wedge blocks (88) are evenly spaced around the outside of the rotating ring (87) in the circumferential direction. Four inclined surfaces are evenly spaced around the bottom of the ring frame (81) in the circumferential direction. The inclined surfaces on the first wedge blocks (88) contact the inclined surfaces on the ring frame (81). The support mechanism (9) includes a guide ring (91), an internal threaded sleeve (92), an external threaded sleeve (93), and a support block (94). The bottom of the air cylinder (1) is connected to the guide ring (91), and the bottom of the air cylinder (1) is rotatably connected to the internal threaded sleeve (92). The guide ring (91) is located inside the internal threaded sleeve (92). The internal threaded sleeve (92) is provided with an external threaded sleeve (93) in an internal threaded manner. Multiple support blocks (94) for supporting the clamping block (4) are evenly spaced around the inner side of the external threaded sleeve (93). The number of support blocks (94) is the same as the number of clamping blocks (4). The support blocks (94) and the guide ring (91) are slidably connected. The top of the support block (94) and the bottom of the clamping block (4) are in contact. The detection mechanism (10) includes a tension sensor (101), a display (102) and a controller (103). The tension sensor (101) is connected between the top of the moving ring (2) and the top of the air cylinder (1). The display (102) and the controller (103) are connected to the air pump (5). The tension sensor (101) and the display (102) are both electrically connected to the controller (103).

2. The pile foundation anchor pull-out testing device according to claim 1, characterized in that: It also includes a pushing mechanism (11) for pushing the first wedge (88) upward. The pushing mechanism (11) includes a drive ring (111), a contact rod (113), a second wedge (114) and a third elastic element (115). The drive ring (111) is connected to the outside of the rotating ring (87). The top of the drive ring (111) has multiple slanted openings (112) evenly spaced around the circumference. Multiple contact rods (113) are slidably provided on the outside of the annular frame (81) evenly spaced around the circumference. The number of contact rods (113) is the same as the number of slanted openings (112). The bottom end of each contact rod (113) is connected to a second wedge (114). The second wedge (114) is located inside the slanted opening (112). The third elastic element (115) is connected between the annular frame (81) and the second wedge (114).

3. The pile foundation anchor pull-out testing device according to claim 2, characterized in that: It also includes a placement mechanism (12), which includes a first connecting ring (121), a second connecting ring (122) and a placement rack (123). The first connecting ring (121) is connected to the outside of the annular frame (81), and the second connecting ring (122) is connected to the outside of the air cylinder (1). Multiple placement racks (123) are connected between the second connecting ring (122) and the first connecting ring (121).

4. A pile foundation anchor pull-out testing device according to claim 3, characterized in that: It also includes a correction mechanism (13), which includes a first level (131) and a second level (132). The first level (131) and the second level (132) are connected to a mounting bracket (123). The first level (131) is set horizontally and the second level (132) is set vertically.

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