A bridge expansion joint detection device

Abstract

The present invention discloses a bridge expansion joint detection device, which belongs to the field of bridge detection, and includes a detection tube, a support mechanism, a fixing mechanism and a detection shaft, wherein the detection shaft is rotatably arranged inside the detection tube, the support mechanism is symmetrically arranged on both sides of the detection tube, the fixing mechanism is arranged on the side of the detection tube, and the detection shaft includes an adjustment mechanism and a pressure mechanism, wherein the adjustment mechanism is rotatably arranged on the top of the pressure mechanism. The present invention can effectively perform pressure detection on the sealing strip of the bridge expansion joint, thereby detecting whether the sealing strip is aged, damaged, loosened, etc., and can be flexibly adjusted according to actual conditions, and the detection method is similar to the situation of a car squeezing debris, which is more practical, and the method of increasing the downforce with the displacement distance is compared with increasing the downforce at a single point in situ, and the detection range is wider, which is more suitable for random inspection.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge detection, and specifically refers to a bridge expansion joint detection device. Background Art

[0002] Bridge expansion joints are an important part of bridge structures. Their main function is to adapt to the deformation of bridges caused by temperature changes, loads, foundation settlement and other factors, while ensuring the stability and safety of vehicle driving. Bridge expansion joints are generally composed of steel structures and V-shaped sealing strips. In bridge expansion joints, sealing strips play a vital role. They can prevent debris, moisture, etc. from entering the expansion joints, ensuring the normal operation of the expansion joints and the durability of the bridge structure. However, with the increase in the service life of the bridge and the influence of the external environment, the sealing strips may age, break, loosen and other problems. These problems will not only affect the sealing performance of the expansion joints, but may also cause debris to enter the expansion joints, accelerate the damage of the expansion joints, and even pose a threat to the safety of the bridge structure. In daily use, debris often falls between the expansion joints, and the car will squeeze the sealing strips when it presses over the debris. At present, bridge inspections usually only use manual observation of the appearance or use sensors to detect, and cannot detect the connection strength between the steel structure and the sealing strips, which has defects. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a bridge expansion joint detection device, which can detect the compressive resistance of the sealing strip and can be flexibly adjusted and is suitable for various situations.

[0004] The technical solution adopted by the present invention is as follows: A bridge expansion joint detection device provided by the present invention includes a detection cylinder, a supporting mechanism, a fixing mechanism and a detection shaft, the detection shaft is rotatably arranged on the inner side of the detection cylinder, the supporting mechanism is symmetrically arranged on both sides of the detection cylinder, the fixing mechanism is arranged on the side of the detection cylinder, the detection shaft includes an adjustment mechanism and a pressure mechanism, the adjustment mechanism is rotatably arranged on the top of the pressure mechanism, the detection cylinder includes a center cylinder, a threaded sleeve one, a limiting sleeve, a bottom cylinder, a threaded sleeve two and a pressure head, the threaded sleeve one is arranged at the top of the center cylinder, the threaded sleeve one is communicated with the center cylinder, the limiting sleeve is arranged at the bottom of the center cylinder, the bottom cylinder is arranged at the bottom of the center cylinder, the bottom cylinder is arranged on the outside of the limiting sleeve, the bottom of the bottom cylinder is open, the threaded sleeve two is slidably clamped on the inner side of the bottom cylinder, the threaded sleeve two is arranged on the outside of the limiting sleeve, the pressure head is arranged at the bottom of the threaded sleeve two, and the side wall of the center cylinder is provided with a threading opening.

[0005] Furthermore, an adjustment opening is provided on the side wall of the central tube, and a cylindrical gear is rotatably provided in the adjustment opening.

[0006] Furthermore, the adjustment mechanism includes a screw, a rotating plate 1, a spring, a rotating plate 2, a groove 1, a buckle 1 and a buckle 2, wherein the groove 1 is opened on the bottom wall of the screw, the screw is rotatably arranged in a threaded sleeve 1, the screw is threadedly engaged with a threaded sleeve 1, the rotating plate 1 is arranged below the screw, the buckle 1 is arranged at the top of the rotating plate 1, the buckle 1 is inserted into the groove 1, the rotating plate 1 is connected to the screw by magnetic attraction, the spring is arranged at the bottom of the rotating plate 1, the rotating plate 2 is arranged at the bottom of the spring, and the buckle 2 is arranged at the bottom of the rotating plate 2.

[0007] Furthermore, a hexagonal groove is provided on the top wall of the screw, which is convenient for operation by an hexagonal wrench in existing tools.

[0008] Furthermore, the pressure mechanism includes a winding roller, a connecting wire, a gear ring, a second toothed disc ring, a second groove, a sliding rod and a second screw. The winding roller is arranged below the second rotating plate, the second groove is opened on the top wall of the winding roller, the second buckle is inserted in the second groove, the connecting wire is wound around the side wall of the winding roller, the end of the connecting wire passes through the threading opening and is connected to the fixing mechanism, the gear ring is arranged around the side wall of the winding roller, the gear ring is meshed with the cylindrical gear, the second toothed disc ring is arranged on the top wall of the winding roller, the sliding rod is arranged at the bottom of the winding roller, the sliding rod is slidably arranged on the inner side of the limiting sleeve, the outer wall of the sliding rod is fitted with the inner wall of the limiting sleeve, the second screw is arranged at the bottom of the sliding rod, the second screw is rotatably arranged on the inner side of the second threaded sleeve, and the second screw is threadably meshed with the second threaded sleeve.

[0009] Wherein, the cylindrical gear is meshed with the gear ring gear.

[0010] The grooves 1 and 2 only position the plug buckle 1 and the plug buckle 2, but do not limit the plug buckle 1 and the plug buckle 2. The plug buckle 1 and the plug buckle 2 can rotate in the grooves 1 and 2 respectively.

[0011] Furthermore, a connecting rod is provided at the bottom of the top wall of the central tube, a chainring ring 1 is provided at the bottom of the connecting rod, and the chainring ring 1 is provided directly above the chainring ring 2.

[0012] The connecting wire is pulled, and the connecting wire drives the winding roller to rotate, thereby driving the second screw to rotate, and the second screw drives the second threaded sleeve to move downward, so that the pressure head is pressed downward.

[0013] Furthermore, the supporting mechanism includes an elastic telescopic rod, a pressure rod, a roller groove, a sliding roller and a fixed plate, the elastic telescopic rod is arranged on the side wall of the central tube, the pressure rod is arranged at the end of the elastic telescopic rod, the roller groove is symmetrically opened on the side wall of the pressure rod away from the central tube, the sliding roller is rotatably arranged in the roller groove, the fixed plate is arranged on the side wall of the pressure rod away from the central tube, and the fixed plate is arranged below the sliding roller.

[0014] Furthermore, the fixing mechanism includes a pressure block 1, a pressure block 2, a screw 1 and a hexagonal block, the pressure block 1 is arranged on the side of the pressure block 2, the hexagonal block is rotatably arranged on the side wall of the pressure block 2 close to the pressure block 1, the hexagonal block is convenient to operate with a wrench in the existing tools, the screw 1 is arranged on the side wall of the hexagonal block away from the pressure block 2, the side wall of the pressure block 1 close to the pressure block 2 is provided with a screw hole, the screw 1 is rotatably arranged in the screw hole, the screw 1 is threadedly engaged with the screw hole, and the side wall of the pressure block 1 away from the pressure block 2 and the side wall of the pressure block 2 away from the pressure block 1 are respectively provided with anti-slip glue.

[0015] The beneficial effects achieved by the present invention using the above structure are as follows: a bridge expansion joint detection device provided by the present scheme squeezes the elastic telescopic rod, and inserts the fixing plate into the slot of the steel structure of the bridge expansion joint and the sealing strip. The elastic telescopic rod squeezes the sliding rollers to both sides, and at the same time places the fixing mechanism between the steel structures. The hexagonal block is rotated by a tool, and screw one causes pressure block one and pressure block two to be stretched to both sides, so that the fixing mechanism is fixed between the steel structures. The detection cylinder is then pulled away from the fixing mechanism to start detection. During the movement of the detection cylinder, the connecting wire causes the winding roller to rotate, and the pressure head squeezes the sealing strip downward. The pressure gradually increases with the movement distance of the detection cylinder. As the pressure increases, the reaction force of the sealing strip on the pressure head gradually begins to counteract the elastic force of the spring, and the pressure mechanism is pushed upward by the pressure head and the threaded sleeve two until the toothed disc ring one and the toothed disc ring two are in contact, and the winding roller cannot rotate, indicating that the sealant in the current inspection position is The connection strength between the strip and the steel structure has been tested. At the same time, when the distance between the steel structures is different, the distance that the lowest point of the sealing strip can be displaced downward is also different. According to the current state of the bridge, the telescopic distance of the elastic telescopic rod can be observed, and the spring length in the initial state can be adjusted by adjusting the screw, thereby adjusting the force required to push the chainring two upward to the chainring one. At the same time, the detachable design of the rotating plate one, the rotating plate two and the spring is convenient for replacement according to the specifications of the bridge expansion joint, so as to adjust the elastic force of the spring to adapt to different usage scenarios. This method can effectively perform pressure testing on the sealing strips of the bridge expansion joints, and then detect whether the sealing strips are aging, damaged, loose, etc., and can be flexibly adjusted according to actual conditions, and the detection method is similar to the situation of a car squeezing debris, which is more practical. Compared with increasing the downforce at a single point in situ, the method of increasing the downforce with the displacement distance has a wider detection range and is more suitable for random inspections. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a bridge expansion joint detection device provided by the present invention;

[0017] Figure 2 A three-dimensional cross-sectional view of a bridge expansion joint detection device provided by the present invention with the fixing mechanism removed;

[0018] Figure 3 A schematic structural diagram of a bridge expansion joint detection device provided by the present invention with the fixing mechanism removed from another perspective;

[0019] Figure 4 A cross-sectional view of the detection tube provided by the present invention;

[0020] Figure 5 for Figure 4 A partial enlarged view of part A in FIG.

[0021] Figure 6 A schematic diagram of the structure of the detection axis provided by the present invention;

[0022] Figure 7 This is a structural schematic diagram of the fixing mechanism provided by the present invention.

[0023] Among them, 1. detection cylinder, 2. support mechanism, 3. fixing mechanism, 4. detection shaft, 5. adjustment mechanism, 6. pressure mechanism, 101. center cylinder, 102. threaded sleeve 1, 103. limit sleeve, 104. bottom cylinder, 105. threaded sleeve 2, 106. pressure head, 107. adjustment opening, 108. cylindrical gear, 109. threading opening, 110. connecting rod, 111. toothed disc ring 1, 201. elastic telescopic rod, 202. pressure rod, 203. roller groove, 204. sliding Roller, 205, fixed plate, 301, pressure block 1, 302, screw rod 1, 303, hexagonal block, 304, pressure block 2, 305, anti-slip glue, 501, screw, 502, hexagonal groove, 503, rotating plate 1, 504, spring, 505, rotating plate 2, 506, groove 1, 507, buckle 1, 508, buckle 2, 601, winding roller, 602, connecting line, 603, gear ring, 604, toothed disc ring 2, 605, sliding rod, 606, screw rod 2, 607, groove 2.

[0024] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0027] like Figure 1-Figure 7 As shown, a bridge expansion joint detection device provided by the present invention includes a detection tube 1, a support mechanism 2, a fixing mechanism 3 and a detection shaft 4, the detection shaft 4 is rotatably arranged on the inner side of the detection tube 1, the support mechanism 2 is symmetrically arranged on both sides of the detection tube 1, the fixing mechanism 3 is arranged on the side of the detection tube 1, the detection shaft 4 includes an adjustment mechanism 5 and a pressure mechanism 6, the adjustment mechanism 5 is rotatably arranged on the top of the pressure mechanism 6, the detection tube 1 includes a central tube 101, a threaded sleeve 102, a limiting sleeve 103, a bottom tube 104, a threaded sleeve 2 105 and a pressure head 106, the threaded sleeve 102 is arranged on the top of the central tube 101, The threaded sleeve 102 is communicated with the center tube 101, the limiting sleeve 103 is arranged at the bottom of the center tube 101, the bottom tube 104 is arranged at the bottom of the center tube 101, the bottom tube 104 is arranged on the outside of the limiting sleeve 103, the bottom of the bottom tube 104 is open, the threaded sleeve 105 is slidably clamped on the inside of the bottom tube 104, the threaded sleeve 105 is arranged on the outside of the limiting sleeve 103, the pressure head 106 is arranged at the bottom of the threaded sleeve 105, the side wall of the center tube 101 is provided with a threading opening 109, the side wall of the center tube 101 is provided with an adjustment opening 107, and a cylindrical gear 108 is rotatably provided in the adjustment opening 107.

[0028] The adjusting mechanism 5 comprises a screw 501, a rotating plate 503, a spring 504, a rotating plate 505, a groove 506, a buckle 507 and a buckle 508, wherein the groove 506 is arranged on the bottom wall of the screw 501, the screw 501 is rotatably arranged in a threaded sleeve 102, the screw 501 is threadedly engaged with the threaded sleeve 102, the rotating plate 503 is arranged below the screw 501, the buckle 507 is arranged at the top of the rotating plate 503, the buckle 507 is inserted in the groove 506, the rotating plate 503 is connected to the screw 501 by magnetic attraction, the spring 504 is arranged at the bottom of the rotating plate 503, the rotating plate 505 is arranged at the bottom of the spring 504, and the buckle 508 is arranged at the bottom of the rotating plate 505.

[0029] A hexagonal slot 502 is formed on the top wall of the screw 501, so as to facilitate operation with an internal hexagonal wrench in existing tools.

[0030] The pressure mechanism 6 includes a winding roller 601, a connecting line 602, a gear ring 603, a second toothed disc ring 604, a second groove 607, a sliding rod 605 and a second screw 606. The winding roller 601 is arranged below the second rotating plate 505, the second groove 607 is opened on the top wall of the winding roller 601, the second buckle 508 is inserted in the second groove 607, the connecting line 602 is wound around the side wall of the winding roller 601, the end of the connecting line 602 passes through the threading opening 109 and is connected to the fixing mechanism 3, the gear ring 603 is arranged around the side wall of the winding roller 601, the gear ring 603 is meshed with the cylindrical gear 108, and the second toothed disc ring 604 is arranged on the winding roller 6 01 top wall, the slide bar 605 is arranged at the bottom of the winding roller 601, the slide bar 605 is slidably arranged on the inner side of the limiting sleeve 103, the outer wall of the slide bar 605 is fitted with the inner wall of the limiting sleeve 103, the screw rod 606 is arranged at the bottom of the slide bar 605, the screw rod 606 is rotatably arranged on the inner side of the threaded sleeve 105, the screw rod 606 is threadedly engaged with the threaded sleeve 105, the groove 1 506 and the groove 2 607 only position the plug buckle 1 507 and the plug buckle 2 508, and do not limit the plug buckle 1 507 and the plug buckle 2 508, the plug buckle 1 507 and the plug buckle 2 508 can rotate in the groove 1 506 and the groove 2 607 respectively.

[0031] The cylindrical gear 108 is meshed with the gear ring 603 .

[0032] A connecting rod 110 is provided at the bottom of the top wall of the central tube 101 , and a chainring 1 111 is provided at the bottom of the connecting rod 110 . The chainring 1 111 is arranged right above the chainring 2 604 .

[0033] The supporting mechanism 2 includes an elastic telescopic rod 201, a pressure rod 202, a roller groove 203, a sliding roller 204 and a fixed plate 205. The elastic telescopic rod 201 is arranged on the side wall of the central tube 101, the pressure rod 202 is arranged at the end of the elastic telescopic rod 201, the roller groove 203 is symmetrically opened on the side wall of the pressure rod 202 away from the central tube 101, the sliding roller 204 is rotatably arranged in the roller groove 203, the fixed plate 205 is arranged on the side wall of the pressure rod 202 away from the central tube 101, and the fixed plate 205 is arranged below the sliding roller 204.

[0034] The fixing mechanism 3 includes a pressure block 1 301, a pressure block 2 304, a screw 1 302 and a hexagonal block 303. The pressure block 1 301 is arranged on the side of the pressure block 2 304, and the hexagonal block 303 is rotatably arranged on the side wall of the pressure block 2 304 close to the pressure block 1 301. The hexagonal block 303 is convenient to operate with a wrench in existing tools. The screw 1 302 is arranged on the side wall of the hexagonal block 303 away from the pressure block 2 304. A screw hole is provided on the side wall of the pressure block 1 301 close to the pressure block 2 304. The screw 1 302 is rotatably arranged in the screw hole. The screw 1 302 is threadedly engaged with the screw hole. The side wall of the pressure block 1 301 away from the pressure block 2 304 and the side wall of the pressure block 2 304 away from the pressure block 1 301 are respectively provided with anti-slip glue 305.

[0035] When in use, first squeeze the elastic telescopic rod 201, insert the fixing plate 205 into the slot of the steel structure of the bridge expansion joint and the sealing strip, the elastic telescopic rod 201 squeezes the sliding roller 204 to both sides to make it fit the side wall of the steel structure, the fixing plate 205 plays a fixing role between the sealing strip and the slot of the steel structure, and at the same time put the fixing mechanism 3 between the steel structures, rotate the hexagonal block 303 by the tool, the screw 1 302 makes the pressing block 1 301 and the pressing block 2 304 open to both sides, so that the fixing mechanism 3 is fixed between the steel structures, and then moves away from the fixing mechanism 3. Pull the detection cylinder 1 to start the detection. During the movement of the detection cylinder 1, the connecting wire 602 is pulled out from the winding roller 601, causing the winding roller 601 to rotate, and the screw rod 606 drives the threaded sleeve 105 to make the pressure head 106 press the sealing strip downward. The pressure gradually increases with the moving distance of the detection cylinder 1. As the pressure increases, the reaction force of the sealing strip on the pressure head 106 gradually begins to counteract the elastic force of the spring 504, and the pressure mechanism 6 is pushed upward through the pressure head 106 and the threaded sleeve 105. When the reaction force is greater than the counteracting spring 504, the toothed disc ring 606 is pressed downward. 04 is pushed upward to the force required for the chainring 1 111, the chainring 1 111 fits with the chainring 2 604, and the winding roller 601 cannot rotate, which means that the connection strength between the sealing strip and the steel structure at the current inspection position has passed the test. At the same time, when the distance between the steel structures is different, the distance that the lowest point of the sealing strip can move downward is also different. According to the current state of the bridge, the telescopic distance of the elastic telescopic rod 201 can be observed, and the length of the spring 504 in the initial state can be adjusted by adjusting the screw 501, so as to adjust the force required to push the chainring 2 604 upward to the chainring 1 111. The shorter the length of the spring 504 in the initial state, the greater the force required to push the chainring 2 604 upward to the chainring 1 111. At the same time, the rotating plate 1 503, the rotating plate 2 505 and the spring 504 are detachable. According to the specifications and usage scenarios of the bridge expansion joint, the springs 504 with different elastic forces can be replaced to adapt to different situations. After the current detection point is detected, the present invention can be removed, and the cylindrical gear 108 can be rotated to make the winding roller 601 rotate in the opposite direction, the mobile phone connection line 602 can be reconnected, and the threaded sleeve 2 105 and the pressure head 106 can be reset.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A bridge expansion joint detection device, characterized in that: The invention comprises a detection cylinder (1), a support mechanism (2), a fixing mechanism (3) and a detection shaft (4), wherein the detection shaft (4) is rotatably arranged inside the detection cylinder (1), the support mechanism (2) is symmetrically arranged on both sides of the detection cylinder (1), the fixing mechanism (3) is arranged on the side of the detection cylinder (1), the detection shaft (4) comprises an adjustment mechanism (5) and a pressure mechanism (6), the adjustment mechanism (5) is rotatably arranged on the top of the pressure mechanism (6), the detection cylinder (1) comprises a central cylinder (101), a threaded sleeve 1 (102), a limiting sleeve (103), a bottom cylinder (104), a threaded sleeve 2 (105) and a pressure head (106), the threaded sleeve 1 (102) ) is arranged at the top of the central tube (101), the threaded sleeve one (102) is communicated with the central tube (101), the limiting sleeve (103) is arranged at the bottom of the central tube (101), the bottom tube (104) is arranged at the bottom of the central tube (101), the bottom tube (104) is arranged outside the limiting sleeve (103), the bottom of the bottom tube (104) is open, the threaded sleeve two (105) is slidably clamped on the inner side of the bottom tube (104), the threaded sleeve two (105) is arranged outside the limiting sleeve (103), the pressure head (106) is arranged at the bottom of the threaded sleeve two (105), and the side wall of the central tube (101) is provided with a threading opening (109); The adjusting mechanism (5) comprises a screw (501), a rotating plate (503), a spring (504), a rotating plate (505), a groove (506), a buckle (507) and a buckle (508), wherein the groove (506) is formed on the bottom wall of the screw (501), the screw (501) is rotatably disposed in a threaded sleeve (102), the screw (501) is threadedly engaged with the threaded sleeve (102), and the rotating plate (505) is provided with a plurality of springs. 03) is arranged below the screw (501), the buckle one (507) is arranged at the top of the rotating plate one (503), the buckle one (507) is inserted into the groove one (506), the rotating plate one (503) and the screw (501) are connected by magnetic attraction, the spring (504) is arranged at the bottom of the rotating plate one (503), the rotating plate two (505) is arranged at the bottom of the spring (504), and the buckle two (508) is arranged at the bottom of the rotating plate two (505); The pressure mechanism (6) comprises a winding roller (601), a connecting wire (602), a gear ring (603), a second toothed disc ring (604), a second groove (607), a sliding rod (605) and a second screw rod (606); the winding roller (601) is arranged below the second rotating plate (505); the second groove (607) is opened on the top wall of the winding roller (601); the second buckle (508) is inserted into the second groove (607); the connecting wire (602) is wound around the side wall of the winding roller (601); the end of the connecting wire (602) passes through the threading opening (109) and is connected to the fixing mechanism (3); the gear ring (603) The gear ring (603) is arranged around the side wall of the winding roller (601), the gear ring (603) is meshed with the cylindrical gear (108), the toothed disc ring (604) is arranged on the top wall of the winding roller (601), the sliding rod (605) is arranged at the bottom of the winding roller (601), the sliding rod (605) is slidably arranged on the inner side of the limiting sleeve (103), the outer wall of the sliding rod (605) is in contact with the inner wall of the limiting sleeve (103), the second screw rod (606) is arranged at the bottom of the sliding rod (605), the second screw rod (606) is rotatably arranged on the inner side of the second threaded sleeve (105), and the second screw rod (606) is threadedly meshed with the second threaded sleeve (105).

2. A bridge expansion joint detection device according to claim 1, characterized in that: A connecting rod (110) is provided at the bottom of the top wall of the central tube (101), and a chainring ring 1 (111) is provided at the bottom of the connecting rod (110). The chainring ring 1 (111) is arranged directly above the chainring ring 2 (604).

3. A bridge expansion joint detection device according to claim 2, characterized in that: The support mechanism (2) comprises an elastic telescopic rod (201), a pressure rod (202), a roller groove (203), a sliding roller (204) and a fixed plate (205); the elastic telescopic rod (201) is arranged on the side wall of the central tube (101); the pressure rod (202) is arranged at the end of the elastic telescopic rod (201); the roller groove (203) is symmetrically opened on the side wall of the pressure rod (202) away from the central tube (101); the sliding roller (204) is rotatably arranged in the roller groove (203); the fixed plate (205) is arranged on the side wall of the pressure rod (202) away from the central tube (101); and the fixed plate (205) is arranged below the sliding roller (204).

4. A bridge expansion joint detection device according to claim 3, characterized in that: The fixing mechanism (3) comprises a pressure block 1 (301), a pressure block 2 (304), a screw rod 1 (302) and a hexagonal block (303), wherein the pressure block 1 (301) is arranged on the side of the pressure block 2 (304), the hexagonal block (303) is rotatably arranged on the side wall of the pressure block 2 (304) close to the pressure block 1 (301), the screw rod 1 (302) is arranged on the side wall of the hexagonal block (303) away from the pressure block 2 (304), a screw hole is provided on the side wall of the pressure block 1 (301) close to the pressure block 2 (304), the screw rod 1 (302) is rotatably arranged in the screw hole, the screw rod 1 (302) is threadedly engaged with the screw hole, and the side wall of the pressure block 1 (301) away from the pressure block 2 (304) and the side wall of the pressure block 2 (304) away from the pressure block 1 (301) are respectively provided with anti-slip glue (305).

5. A bridge expansion joint detection device according to claim 4, characterized in that: The side wall of the central tube (101) is provided with an adjustment opening (107), a cylindrical gear (108) is rotatably arranged in the adjustment opening (107), and the cylindrical gear (108) is meshed with the gear of the gear ring (603).

6. A bridge expansion joint detection device according to claim 5, characterized in that: The top wall of the screw (501) is provided with a hexagonal slot (502).

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