A comparative detection type rectangular jacking pipe joint shear test machine

Abstract

The present invention discloses a comparative detection type rectangular jacking pipe joint shear tester, comprising a device body, the upper surface of the device body is fixedly connected with a placing table, and the upper side of the device body is fixedly connected with a starter, and the output end of the starter is fixedly connected with a moving plate, a moving groove is provided on the upper surface of the placing table, and a moving block is slidably connected inside the moving groove, and a positive clamping plate is fixedly connected to the upper surface of the moving block. In the comparative detection type rectangular jacking pipe joint shear tester, when the positive clamping plate clamps and limits the rectangular jacking pipe, the suction cup will initially adsorb the side wall of the rectangular jacking pipe, and the threaded adjustment rod is rotated, so that the threaded adjustment rod drives the adjustment plate to move to the outside of the positive clamping plate, and the adjustment plate drives the sealing plate to move along the inside of the suction box through the docking rod, and the air inside the suction cup is extracted, so as to further improve the adsorption effect of the suction cup on the rectangular jacking pipe and the stability of the side limit of the rectangular jacking pipe.

Description

Technical Field

[0001] The invention relates to the technical field, in particular to a comparative detection type rectangular jacking pipe joint shear testing machine. Background Art

[0002] Rectangular jacking pipe sections are prefabricated components used to connect and support the rectangular jacking tunnel project. They are suitable for underground passages at the entrances and exits of subway stations, urban underground space connecting passages, urban underground pedestrian (vehicle) passages and other projects.

[0003] Since rectangular pipe jacking is mostly used in underground environments, which are complex and diverse, it is very easy for the pipe joints to undergo shear deformation when the rectangular pipe jacking is in use. When the shear deformation is too large, it will affect the normal use of the device and even pose a safety hazard. Therefore, when using the rectangular pipe jacking, it is necessary to conduct shear tests on the pipe joints.

[0004] In order to overcome the above-mentioned defects, prior art 1 (publication number: CN110132760A, Chinese patent with publication date of 2019-08-16) is a material tension, compression and shear composite experimental equipment, including a tension and compression support mechanism, a shear support mechanism, a clamping mechanism, a tension, compression and shear power mechanism. When the specimen is clamped, the clamping mechanism is used to prevent the clamping force from deforming the specimen during the clamping process. The equipment is used to make the clamped specimen produce tension, compression and shear strains, and can control its loading ratio, speed, whether to unload, etc. The tension and compression are generated by the tension screw driving the tension plate, acting on the workpiece through the shear support plate, and the influence of the shear force is offset by the shear support mechanism. The shear force is generated by the shear screw driving the upper support plate, acting on the specimen through the lower fixed plate, and the upper and lower support blocks work together to offset the influence of the tensile force. The present invention solves the need for continuous change of the loading path of the specimen under strain and stress space.

[0005] There is also prior art 2 (publication number: CN109855986B, Chinese patent published on 2021-07-13) a shear test method for rectangular jacking tunnel pipe joints, including the following steps: placing three rectangular jacking pipe components connected by F-type socket joints on the support system, so that two steel supports are respectively supported under the rectangular jacking pipe components on both sides, and two elastic supports and two temporary supports are set under the middle rectangular jacking pipe component; installing a vertical load application device directly above the middle rectangular jacking pipe component, installing a pressure sensor on the upper part of the elastic support, and installing an electric displacement meter on the lower part of the steel ring; applying loads of various levels in sequence through the vertical load application device to obtain test data, and then analyzing and processing them to obtain the shear stiffness model of the rectangular jacking pipe joint. It has strong operability. By setting elastic supports to simulate the limiting effect of the stratum on the deformation of the joint, the shear mechanical behavior of the rectangular jacking pipe joint can be more realistically reflected, and the shear stiffness model of the joint can be accurately obtained.

[0006] Although the existing technologies 1 and 2 can perform shear tests, they cannot limit the multi-directional position of the rectangular jacking pipe during the experiment. When the rectangular jacking pipe is undergoing a shear test, the force on its pipe body may shift, which will have a certain impact on the experimental results.

[0007] Therefore, we proposed a comparative detection rectangular pipe jacking joint shear tester to solve the above problems. Summary of the invention

[0008] The purpose of the present invention is to provide a comparative detection type rectangular jacking pipe joint shear testing machine to solve the problem that in the current experimental process on the market mentioned above, the rectangular jacking pipe cannot be limited in multiple directions. When the rectangular jacking pipe is undergoing a shear test, the force on its pipe body may be offset, thereby causing a certain impact on the experimental results.

[0009] To achieve the above object, the present invention provides the following technical solution: a comparative detection type rectangular jacking pipe joint shear tester, comprising a device body, a placing table is fixedly connected to the upper surface of the device body, a starter is fixedly connected to the upper side of the device body, and a moving plate is fixedly connected to the output end of the starter;

[0010] Two moving grooves, the moving grooves are provided at the front and rear sides of the upper surface of the placing table, and the inside of the moving grooves is slidably connected with a moving block, and the upper surface of the moving block is fixedly connected with a positive clamping plate, and the inner side of the positive clamping plate is provided with a limiting mechanism that can stably clamp the front and rear sides of the rectangular top pipe;

[0011] A rotating shaft, the rotating shaft is rotatably connected to the outer side end of the forward clamping plate, and the lateral clamping plate is fixedly connected to the rotating shaft, and an auxiliary mechanism that can drive the lateral clamping plate to perform auxiliary clamping is arranged between the end side of the rotating shaft and the inner side of the forward clamping plate;

[0012] A movable box is fixedly connected to the lower surface of the movable plate, and a push rod is slidably connected to the side of the movable box, and a deformation detector is fixedly connected to the outer end of the push rod, and an adjustment mechanism for comparative detection of both sides of the top pipe is arranged between the inner end of the push rod and the inside of the movable box.

[0013] Preferably, the limiting mechanism includes a spring body, which is fixedly connected between the moving block and the moving groove, the inner side of the positive clamping plate is fixedly connected with an air suction box, and the outer surface of the air suction box is penetrated by a suction cup, and the inside of the suction cup air suction box is slidably connected with a sealing plate, the outer side of the sealing plate is fixedly connected with a docking rod, the outer side of the positive clamping plate is threadedly connected with a threaded adjustment rod, and the inner end of the threaded adjustment rod is slidably connected with an adjustment plate, and the inner side of the adjustment plate is fixedly connected to the other end of the docking rod.

[0014] Preferably, the adjustment plate drives the docking rod and the suction box to form a sliding structure through the threaded adjustment rod, and the suction boxes are distributed in a rectangular array shape on the inner side of the positive clamping plate.

[0015] Preferably, the moving block forms a sliding structure through the positive clamping plate and the moving groove, and the moving block forms an elastic structure through the spring body and the moving groove.

[0016] Preferably, the auxiliary mechanism includes a pull rope, one end of which is fixedly connected to the inner side of the adjustment plate, and the other end of the pull rope passes through the forward clamping plate and is wound around the rotating shaft, and the end side of the rotating shaft is fixedly connected to the outer surface of the forward clamping plate with a torsion spring.

[0017] Preferably, the rotating shaft forms an elastic structure with the forward clamping plate through a torsion spring, the lateral clamping plates are arranged symmetrically about the center point of the forward clamping plate, and the adjustment plate forms a traction structure with the rotating shaft through a pull rope.

[0018] Preferably, the adjustment mechanism comprises a turntable, which is rotatably connected to the inside of the movable box, a twisted rod is fixedly connected to the center of the lower end of the turntable, a threaded sleeve is threadedly connected to the outer side of the twisted rod, a connecting plate is fixedly connected to the lower side of the threaded sleeve, and a pressure block is fixedly connected to the lower surface of the connecting plate;

[0019] An auxiliary rod is hinged on the side of the rotating disk, and the other end of the auxiliary rod is hinged to the inner side of the push rod.

[0020] Preferably, the push rod forms a sliding structure with the movable box through the auxiliary rod, and the auxiliary rod forms a rotating structure with the push rod through the turntable, and the movable box is symmetrically arranged in two groups about the center point of the movable plate.

[0021] Preferably, the twisted rod drives the turntable and the movable box to form a rotating structure through the threaded sleeve, and the height of the pressing block is lower than the height of the deformation detector.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The user can place the rectangular jacking pipe on the upper surface of the placement table. At this time, the positive clamping plate will drive the moving block to move to both sides along the moving groove under the resistance of the rectangular jacking pipe, so as to place rectangular jacking pipes of different models. While the moving block moves, it will drive the spring body to undergo elastic deformation. At the same time, the spring body will pull the moving block inward under the driving action of its own elastic force, so that the positive clamping plate will initially clamp and limit the rectangular jacking pipe.

[0024] When the positive clamping plate clamps and limits the rectangular jacking pipe, the suction cup will initially adsorb the side wall of the rectangular jacking pipe, and rotate the threaded adjustment rod, so that the threaded adjustment rod drives the adjustment plate to move toward the outside of the positive clamping plate. While the adjustment plate moves, it will synchronously drive the sealing plate to move along the inside of the suction box through the docking rod, so as to extract the air inside the suction cup, further improve the adsorption effect of the suction cup on the rectangular jacking pipe, and thus improve the stability of the side limit of the rectangular jacking pipe;

[0025] When the adjusting plate moves, it will pull the pull rope synchronously. At this time, the pull rope will pull the rotating shaft and make the rotating shaft rotate. When the rotating shaft rotates, the lateral clamping plate will rotate synchronously, so that the lateral clamping plate clamps the end side of the rectangular jacking pipe. The lateral clamping plate cooperates with the forward clamping plate to further improve the limiting effect of the rectangular jacking pipe and reduce the possibility of the rectangular jacking pipe deflecting during the shear test machine.

[0026] The starter is started, so that the starter drives the movable plate to move downward until the pressing block contacts the rectangular jacking pipe, thereby performing a shear test on the rectangular jacking pipe. When the movable plate moves downward, it moves along the side of the device body. The movable plate can be limited by the device body, thereby improving the stability of the pressing block in the shear test;

[0027] When the pressing block moves downward and contacts the rectangular jacking pipe, the rectangular jacking pipe will exert a reaction force on the pressing block, so that the pressing block drives the threaded sleeve to move along the twisted rod through the connecting plate. At this time, the twisted rod will drive the turntable to rotate synchronously under the influence of the threaded connection with the threaded sleeve. When the turntable rotates, the two ends of the auxiliary rod will rotate. When the auxiliary rod rotates, it will synchronously drive the push rod to move along the movable box. At this time, the push rod can push the deformation detector to move outward. At this time, the deformation detectors on both sides can detect the shear deformation results of the rectangular jacking pipe and compare the detection results, so as to better organize the detection data. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0029] Figure 2 It is a schematic diagram of a three-dimensional cross-sectional structure of the present invention;

[0030] Figure 3 It is a schematic diagram of the three-dimensional structure of the forward clamping plate of the present invention;

[0031] Figure 4 It is a schematic diagram of a three-dimensional cross-sectional structure of a placement table of the present invention;

[0032] Figure 5 It is a schematic diagram of a three-dimensional cross-sectional structure of a forward clamping plate of the present invention;

[0033] Figure 6 It is a schematic diagram of the three-dimensional cross-sectional structure of the air suction box of the present invention;

[0034] Figure 7 This is a schematic diagram of the three-dimensional structure of the pull rope of the present invention;

[0035] Figure 8 It is a schematic diagram of the three-dimensional structure of the activity box of the present invention;

[0036] Fig. 9 It is a three-dimensional cross-sectional structural schematic diagram of the movable box of the present invention;

[0037] Fig.10 It is a schematic diagram of the three-dimensional structure of the turntable of the present invention.

[0038] In the figure: 1. device body; 2. placement table; 3. forward clamping plate; 4. lateral clamping plate; 5. starter; 6. moving plate; 7. pressure block; 8. movable box; 9. moving groove; 10. suction cup; 11. moving block; 12. spring body; 13. threaded adjustment rod; 14. adjustment plate; 15. pull rope; 16. suction box; 17. sealing plate; 18. docking rod; 19. rotating shaft; 20. torsion spring; 21. deformation detector; 22. twisted rod; 23. threaded sleeve; 24. turntable; 25. auxiliary rod; 26. push rod; 27. connecting plate. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Embodiment 1: Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The technical solution shown in the figure, the present invention provides the following technical solution: a comparative detection type rectangular jacking pipe joint shear tester, discloses a limit mechanism, and the limit mechanism can prevent the rectangular jacking pipe from deflecting:

[0041] A device body 1, a placing table 2 is fixedly connected to the upper surface of the device body 1, a starter 5 is fixedly connected to the upper side of the device body 1, and a moving plate 6 is fixedly connected to the output end of the starter 5;

[0042] Two moving grooves 9, the moving grooves 9 are provided on the front and rear sides of the upper surface of the placing platform 2, and the inside of the moving grooves 9 is slidably connected with a moving block 11, and the upper surface of the moving block 11 is fixedly connected with a positive clamping plate 3, and the inner side of the positive clamping plate 3 is provided with a limiting mechanism that can stably clamp the front and rear sides of the rectangular top pipe;

[0043] The limiting mechanism includes a spring body 12, which is fixedly connected between the moving block 11 and the moving groove 9, an air suction box 16 is fixedly connected to the inner side of the positive clamping plate 3, and the outer surface of the air suction box 16 is penetrated by a suction cup 10, and the suction cup 10 is slidably connected to the inside of the air suction box 16, and the outer side of the sealing plate 17 is fixedly connected to a docking rod 18, the outer side of the positive clamping plate 3 is threadedly connected to a threaded adjustment rod 13, and the inner end of the threaded adjustment rod 13 is slidably connected to an adjusting plate 14, and the inner side of the adjusting plate 14 is fixedly connected to the other end of the docking rod 18, the adjusting plate 14 drives the docking rod 18 and the air suction box 16 to form a sliding structure through the threaded adjustment rod 13, and the air suction box 16 is distributed in a rectangular array shape about the inner side of the positive clamping plate 3, the moving block 11 forms a sliding structure with the moving groove 9 through the positive clamping plate 3, and the moving block 11 forms an elastic structure with the moving groove 9 through the spring body 12.

[0044] Start the starter 5, so that the starter 5 drives the movable plate 6 to move downward until the pressure block 7 contacts the rectangular jacking pipe. At this time, the pressure of the pressure block 7 driven downward by the starter 5 is used to resist the rectangular jacking pipe to simulate the shear force. During the downward movement of the movable plate 6, the movable box 8 is synchronously driven to move downward. At this time, the deformation of the rectangular jacking pipe can be monitored by the deformation detector 21, so as to perform a shear test on the rectangular jacking pipe. When moving downward, the movable plate 6 will move along the side of the device body 1, and the movable plate 6 can be limited by the device body 1, so as to improve the stability of the pressure block 7 in the shear test.

[0045] The user can place the rectangular jacking pipe on the upper surface of the placement table 2. At this time, the positive clamping plate 3 will drive the moving block 11 to move to both sides along the moving groove 9 under the resistance of the rectangular jacking pipe, so as to place rectangular jacking pipes of different models. While moving, the moving block 11 will drive the spring body 12 to undergo elastic deformation. At the same time, the spring body 12 will pull the moving block 11 inward under the pushing action of its own elastic force, so that the positive clamping plate 3 will initially clamp and limit the rectangular jacking pipe. The positive clamping plate 3 When the rectangular top pipe is clamped and limited, the suction cup 10 will initially adsorb the side wall of the rectangular top pipe, and rotate the threaded adjustment rod 13, so that the threaded adjustment rod 13 drives the adjustment plate 14 to move toward the outside of the positive clamping plate 3. While the adjustment plate 14 moves, it will synchronously drive the sealing plate 17 to move along the inside of the suction box 16 through the docking rod 18, so as to extract the air inside the suction cup 10, further improve the adsorption effect of the suction cup 10 on the rectangular top pipe, thereby improving the stability of the side limit of the rectangular top pipe.

[0046] Embodiment 2: Figure 2 , Figure 6 and Figure 7 The technical solution shown in the figure, the present invention provides the following technical solution: a comparative detection type rectangular jacking pipe joint shear tester, which discloses an auxiliary mechanism, through which the lateral clamping plate 4 can be driven to perform auxiliary limiting on the rectangular jacking pipe:

[0047] A rotating shaft 19, the rotating shaft 19 is rotatably connected to the outer side end of the forward clamping plate 3, and the lateral clamping plate 4 is fixedly connected to the rotating shaft 19, and an auxiliary mechanism that can drive the lateral clamping plate 4 to perform auxiliary clamping is provided between the end side of the rotating shaft 19 and the inner side of the forward clamping plate 3;

[0048] The auxiliary mechanism includes a pull rope 15, one end of which is fixedly connected to the inner side of the adjustment plate 14, and the other end of the pull rope 15 passes through the forward clamping plate 3 and is wound around the rotating shaft 19. The end side of the rotating shaft 19 and the outer surface of the forward clamping plate 3 are fixedly connected to the torsion spring 20. The rotating shaft 19 and the forward clamping plate 3 form an elastic structure through the torsion spring 20. The lateral clamping plate 4 is symmetrically arranged about the center point of the forward clamping plate 3. The adjustment plate 14 forms a traction structure with the rotating shaft 19 through the pull rope 15.

[0049] When the adjusting plate 14 moves, it will synchronously pull the pull rope 15. At this time, the pull rope 15 will pull the rotating shaft 19 and make the rotating shaft 19 rotate. When the rotating shaft 19 is rotating, it will synchronously make the lateral clamping plate 4 rotate, so that the lateral clamping plate 4 clamps the end side of the rectangular jacking pipe. The lateral clamping plate 4 cooperates with the forward clamping plate 3 to further improve the limiting effect of the rectangular jacking pipe and reduce the possibility of the rectangular jacking pipe being offset during the shear test machine.

[0050] Embodiment 3: Figure 1 , Figure 8 , Fig. 9 and Fig.10 The technical solution shown in the figure, the present invention provides the following technical solution: a comparative detection type rectangular jacking pipe joint shear tester, which discloses an adjustment mechanism, and the two sides of the jacking pipe can be comparatively tested by the adjustment mechanism:

[0051] The movable box 8 is fixedly connected to the lower surface of the movable plate 6, and the side of the movable box 8 is slidably connected with a push rod 26, and the outer end of the push rod 26 is fixedly connected with a deformation detector 21, and an adjustment mechanism for comparative detection of both sides of the top pipe is arranged between the inner end of the push rod 26 and the inside of the movable box 8;

[0052] The adjustment mechanism includes a turntable 24, which is rotatably connected to the inside of the movable box 8, a twisted rod 22 is fixedly connected to the center of the lower end of the turntable 24, a threaded sleeve 23 is threadedly connected to the outer side of the twisted rod 22, and a connecting plate 27 is fixedly connected to the lower side of the threaded sleeve 23, and a pressure block 7 is fixedly connected to the lower surface of the connecting plate 27;

[0053] An auxiliary rod 25 is hinged on the side of the turntable 24, and the other end of the auxiliary rod 25 is hinged to the inner side of the push rod 26. The push rod 26 forms a sliding structure with the movable box 8 through the auxiliary rod 25, and the auxiliary rod 25 forms a rotating structure with the push rod 26 through the turntable 24. The movable box 8 is symmetrically arranged in two groups about the center point of the movable plate 6. The twisted rod 22 drives the turntable 24 and the movable box 8 to form a rotating structure through the threaded sleeve 23, and the height of the pressure block 7 is lower than the height of the deformation detector 21.

[0054] When the pressing block 7 moves downward and contacts the rectangular jacking tube, the rectangular jacking tube will apply a reaction force to the pressing block 7, so that the pressing block 7 drives the threaded sleeve 23 to move along the twisted rod 22 through the connecting plate 27. At this time, the twisted rod 22 will drive the turntable 24 to rotate synchronously under the influence of the threaded connection with the threaded sleeve 23. When the turntable 24 rotates, the two ends of the auxiliary rod 25 will rotate. When the auxiliary rod 25 rotates, it will synchronously drive the push rod 26 to move along the movable box 8. At this time, the push rod 26 can push the deformation detector 21 to move outward. At this time, the deformation detectors 21 on both sides (as mature equipment, the deformation detector 21 uses laser technology to measure the deformation of an object, has the characteristics of high precision and long-distance measurement, captures the image of the object through a camera, and uses image processing technology to analyze the deformation of the object. It is suitable for all-weather and non- Contact measurement uses a displacement sensor to measure the displacement change of an object, thereby inferring the deformation of the object. It is suitable for displacement and deformation measurement in various scenarios. A laser beam is emitted by a laser and irradiated on the object to be measured. When the object is deformed, the reflection angle and position of the laser beam will change slightly. These changes are captured by the receiver and converted into electrical signal output. By processing and analyzing the electrical signal, the deformation state and stress change of the object can be obtained. The shear deformation results of the rectangular jacking pipe can be detected. Since two groups of deformation detectors 21 are symmetrically arranged about the movable box 8, the two sides of the rectangular jacking pipe can be detected simultaneously through the deformation detectors 21 on both sides, and the deformation detection results on both sides of the rectangular jacking pipe are compared, and the detection data can be better organized to know the deformation effect of the shear force on both sides of the rectangular jacking pipe.

[0055] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A comparative detection type rectangular jacking pipe joint shear tester, comprising a device body (1), the upper surface of the device body (1) being fixedly connected to a placement table (2), and the upper side of the device body (1) being fixedly connected to a starter (5), and the output end of the starter (5) being fixedly connected to a moving plate (6); It is characterized in that The shear tester also includes: Two movable grooves (9), the movable grooves (9) being provided on the front and rear sides of the upper surface of the placement platform (2), and the interior of the movable grooves (9) being slidably connected to a movable block (11), and the upper surface of the movable block (11) being fixedly connected to a positive clamping plate (3), and the inner side of the positive clamping plate (3) being provided with a limiting mechanism capable of stably clamping the front and rear sides of the rectangular top pipe; The limiting mechanism comprises a spring body (12), wherein the spring body (12) is fixedly connected between the moving block (11) and the moving groove (9); the inner side of the positive clamping plate (3) is fixedly connected with an air suction box (16), and the outer surface of the air suction box (16) is penetrated by a suction cup (10), and the suction cup (10) and the air suction box (16) are slidably connected with a sealing plate (17), the outer side of the sealing plate (17) is fixedly connected with a docking rod (18), the outer side of the positive clamping plate (3) is threadedly connected with a threaded adjustment rod (13), and the inner end of the threaded adjustment rod (13) is slidably connected with an adjustment plate (14), and the inner side of the adjustment plate (14) is fixedly connected to the other end of the docking rod (18); A rotating shaft (19), the rotating shaft (19) being rotatably connected to the outer side end of the forward clamping plate (3), and the lateral clamping plate (4) being fixedly connected to the rotating shaft (19), and an auxiliary mechanism capable of driving the lateral clamping plate (4) to perform auxiliary clamping is provided between the end side of the rotating shaft (19) and the inner side of the forward clamping plate (3); A movable box (8), the movable box (8) being fixedly connected to the lower surface of the movable plate (6), and a push rod (26) being slidably connected to the side of the movable box (8), and a deformation detector (21) being fixedly connected to the outer end of the push rod (26), and an adjustment mechanism capable of performing comparative detection on both sides of the jacking pipe being provided between the inner end of the push rod (26) and the interior of the movable box (8); The adjustment mechanism comprises a rotating disk (24), the rotating disk (24) being rotatably connected to the inside of the movable box (8), a twisted rod (22) being fixedly connected to the center of the lower end of the rotating disk (24), a threaded sleeve (23) being threadedly connected to the outer side of the twisted rod (22), a connecting plate (27) being fixedly connected to the lower side of the threaded sleeve (23), and a pressing block (7) being fixedly connected to the lower surface of the connecting plate (27); An auxiliary rod (25) is hingedly connected to the side of the rotating disk (24), and the other end of the auxiliary rod (25) is hingedly connected to the inner side of the push rod (26).

2. A comparative detection type rectangular jacking pipe joint shear tester according to claim 1, characterized in that: The adjustment plate (14) drives the docking rod (18) and the suction box (16) to form a sliding structure through the threaded adjustment rod (13), and the suction boxes (16) are distributed in a rectangular array shape on the inner side of the forward clamping plate (3).

3. A comparative detection type rectangular jacking pipe joint shear tester according to claim 1, characterized in that: The moving block (11) forms a sliding structure through the forward clamping plate (3) and the moving groove (9), and the moving block (11) forms an elastic structure through the spring body (12) and the moving groove (9).

4. A comparative detection type rectangular jacking pipe joint shear tester according to claim 1, characterized in that: The auxiliary mechanism comprises a pull rope (15), one end of which is fixedly connected to the inner side of the adjustment plate (14), and the other end of which passes through the positive clamping plate (3) and is wound around a rotating shaft (19), and the end side of the rotating shaft (19) and the outer surface of the positive clamping plate (3) are fixedly connected to a torsion spring (20).

5. A comparative detection type rectangular jacking pipe joint shear tester according to claim 4, characterized in that: The rotating shaft (19) forms an elastic structure with the forward clamping plate (3) via a torsion spring (20); the lateral clamping plate (4) is disposed symmetrically about the center point of the forward clamping plate (3); and the adjusting plate (14) forms a traction structure with the rotating shaft (19) via a pull rope (15).

6. A comparative detection type rectangular jacking pipe joint shear tester according to claim 1, characterized in that: The push rod (26) forms a sliding structure with the movable box (8) via the auxiliary rod (25), and the auxiliary rod (25) forms a rotating structure with the push rod (26) via the rotating disk (24), and the movable box (8) is symmetrically arranged in two groups about the center point of the movable plate (6).

7. The comparative detection type rectangular jacking pipe joint shear tester according to claim 1, characterized in that: The twisted rod (22) drives the rotating disk (24) and the movable box (8) to form a rotating structure through the threaded sleeve (23), and the height of the pressing block (7) is lower than the height of the deformation detector (21).

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