A support structure for detecting U-ribs inside steel box beams

Abstract

The present invention discloses a support structure for detecting U-ribs inside a steel box girder, comprising a support arm and guide rails located on both sides of the support arm; the support arm comprises a reference arm and a multi-section telescopic arm, wherein the first section of the telescopic arm can be moved into or out of the reference arm, and the other sections of the telescopic arm can be moved into or out of the previous section of the telescopic arm; the guide rails correspondingly comprise a reference guide rail and a multi-section telescopic guide rail that moves synchronously with the multi-section telescopic arm, wherein the first section of the telescopic guide rail can be moved into or out of the reference guide rail, and the other sections of the telescopic guide rail can be moved into or out of the previous section of the telescopic guide rail. The present invention provides convenience for a detection vehicle to perform detection inside a steel box girder by virtue of the telescopic characteristics of the support arm and the guide rail.

Description

Technical Field

[0001] The invention relates to the field of steel box girder detection, and in particular to a supporting structure for detecting U-ribs inside a steel box girder. Background Art

[0002] More than 1,500 bridges of various types with orthotropic steel decks have been built in various countries around the world, and more than 200 such bridges are in operation or under construction in my country. Orthotropic steel decks are composed of top plates, U-ribs and diaphragms or transverse stiffeners. They are prone to fatigue cracking under repeated vehicle loads. The mechanism of fatigue cracking is complex, difficult to detect in the early stage, difficult to detect and repair, and the repair cost is high. It is the most serious disease affecting the operational safety of steel box girder bridges.

[0003] At present, steel box girders are mainly inspected manually, but manual inspection has the following problems: First, cracks in steel box girders appear in many places, are short in length and small in width, and are easy to be missed during manual inspection; and the steel box girder is 3m to 4m high, and manual inspection requires auxiliary facilities such as ladders, which is time-consuming and laborious; and the internal light of the steel box girder is poor, the visual range is small, and it is inconvenient for inspectors to walk, and the inspection efficiency is low; in addition, in high temperature weather, inspectors cannot inspect. Therefore, it is very necessary to use mechanical inspection instead of manual inspection. Summary of the invention

[0004] The invention provides a support structure for detecting U-ribs inside a steel box girder, which solves the problem in the prior art that a support structure is lacking and facilitates a detection trolley to perform mobile detection.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a support structure for detecting U-ribs inside a steel box girder, including a support arm and guide rails located on both sides of the support arm; the support arm includes a reference arm and a multi-section telescopic arm, wherein a first-section telescopic arm can be moved in or out of the reference arm, and other-section telescopic arms can be moved in or out of the previous-section telescopic arm; the guide rails correspondingly include a reference guide rail and a multi-section telescopic guide rail that moves synchronously with the multi-section telescopic arms, wherein a first-section telescopic guide rail can be moved in or out of the reference guide rail, and other-section telescopic guide rails can be moved in or out of the previous-section telescopic guide rail.

[0006] Preferably, a first telescopic device is provided between the reference arm and the first telescopic arm, and the first telescopic device includes a stepping motor, a lead screw, and a slider; the stepping motor is provided at the tail of the reference arm, the lead screw extends along the axial direction of the reference arm and is connected to the rotating shaft of the stepping motor, and the slider is provided at the tail of the first telescopic arm and is cooperatively connected with the lead screw.

[0007] Preferably, the multi-section telescopic arm further includes a second telescopic arm, a second telescopic device is provided between the first telescopic arm and the second telescopic arm, and the second telescopic device has the same composition as the first telescopic device.

[0008] Preferably, the multi-section telescopic arm also includes a third telescopic arm, and a third telescopic device is arranged in the second telescopic arm, and the third telescopic device includes two front movable pulleys arranged at the tail of the second telescopic arm, and two rear movable pulleys arranged at the head of the second telescopic arm, each of the front movable pulleys is respectively wound with a front steel wire cable, one end of the front steel wire cable is fixedly connected to the head of the first telescopic arm, and the other end is fixedly connected to the tail of the third telescopic arm; each of the rear movable pulleys is respectively wound with a rear steel wire cable, one end of the rear steel wire cable is fixedly connected to the tail of the first telescopic arm, and the other end is fixedly connected to the head of the third telescopic arm.

[0009] Preferably, the multi-section telescopic arm also includes a fourth telescopic arm and a fifth telescopic arm, the third telescopic arm is provided with a fourth telescopic device, the fourth telescopic arm is provided with a fifth telescopic device, and the fourth and fifth telescopic devices are of the same composition as the third telescopic device.

[0010] Preferably, a row of rollers for assisting movement is installed on the inner wall and / or outer wall of the telescopic arm.

[0011] Preferably, the lower end of the support arm is movably connected to a support leg.

[0012] Preferably, the supporting leg includes a first supporting section and a second supporting section that can be moved in or out of the first supporting section, a first screw rod is installed vertically inside the first supporting section, a second screw rod is installed vertically inside the second supporting section, the second screw rod is a hollow structure, the first screw rod can be rotated to the inside of the second screw rod, the top of the first screw rod is exposed from the first supporting section and is driven to rotate by a driving mechanism.

[0013] Preferably, the driving mechanism includes a servo motor and a reducer arranged outside the first supporting joint, the rotating shaft of the servo motor is connected to the reducer, and the reducer is connected to the top of the first screw rod through a belt drive.

[0014] Preferably, the support leg further comprises a third support section, the third support section can be moved into or out of the second support section, and a nut matched with the second screw rod is installed inside the third support section.

[0015] The beneficial effects of the present invention are as follows: the present invention discloses a support structure for detecting U-ribs inside a steel box girder, comprising a support arm and guide rails located on both sides of the support arm; the support arm comprises a reference arm and a multi-section telescopic arm, wherein the first section of the telescopic arm can be moved in or out of the reference arm, and the other sections of the telescopic arm can be moved in or out of the previous section of the telescopic arm; the guide rails correspondingly comprise a reference guide rail and a multi-section telescopic guide rail that moves synchronously with the multi-section telescopic arm, wherein the first section of the telescopic guide rail can be moved in or out of the reference guide rail, and the other sections of the telescopic guide rail can be moved in or out of the previous section of the telescopic guide rail. The present invention provides convenience for the detection trolley to perform detection inside the steel box girder by virtue of the telescopic characteristics of the support arm and the guide rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an overall schematic diagram of a support structure for detecting U-ribs inside a steel box girder according to the present invention;

[0017] Figure 2 is a schematic diagram of a reference arm in a support structure for detecting U-ribs inside a steel box girder according to the present invention;

[0018] Figure 3 It is a schematic diagram of the internal structure of a reference arm in a support structure for detecting U-ribs inside a steel box girder according to the present invention;

[0019] Figure 4 It is a schematic diagram of a first section telescopic arm of a support structure for detecting U-ribs inside a steel box girder according to the present invention;

[0020] Figure 5 It is a schematic diagram of the head of the second telescopic arm in a support structure for detecting U-ribs inside a steel box girder according to the present invention;

[0021] Figure 6 It is a connection schematic diagram of a front movable pulley in a support structure for detecting U-ribs inside a steel box girder according to the present invention;

[0022] Figure 7 It is a connection schematic diagram of a rear movable pulley in a support structure for detecting U-ribs inside a steel box girder according to the present invention;

[0023] Figure 8 It is a schematic diagram of the movement principle of the third telescopic device in a support structure for detecting U ribs inside a steel box girder according to the present invention;

[0024] Fig. 9 It is a schematic diagram of the arrangement of roller rows at the tail of the first telescopic arm in a support structure for detecting U-ribs inside a steel box girder according to the present invention;

[0025] Fig.10 It is a schematic diagram of the arrangement of roller rows at the head of the first telescopic arm in a support structure for detecting U-ribs inside a steel box girder according to the present invention;

[0026] Fig.11 is a schematic diagram of a roller row in a support structure for detecting U-ribs inside a steel box girder according to the present invention;

[0027] Fig.12 is a schematic diagram of a support leg in a support structure for detecting U-ribs inside a steel box girder according to the present invention;

[0028] Fig.13 It is a top schematic diagram of a first supporting node in a supporting structure for detecting U-ribs inside a steel box girder according to the present invention;

[0029] Fig.14 It is a schematic diagram of the internal structure of a support leg in a support structure for detecting U-ribs inside a steel box girder according to the present invention. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0031] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0032] like Figure 1 As shown, the support structure for detecting the U rib inside the steel box girder includes a support arm B1 and guide rails B2 located on both sides of the support arm B1. The detection trolley C can move along the guide rails B2 to detect the U rib inside the steel box girder. The lower end of the support arm B1 is movably connected to a support leg B3, which is used to provide support force to the support arm B1 to prevent the support arm B1 from breaking.

[0033] Specifically, the support arm B1 includes a reference arm B11 and a multi-section telescopic arm, and the multi-section telescopic arm includes a first section telescopic arm B12 to a fifth section telescopic arm B16; wherein the first section telescopic arm B12 can be moved into or out of the reference arm B11, and other sections of telescopic arms can be moved into or out of the previous section of telescopic arms. In the present application, there are five sections of telescopic arms, but it is not limited thereto, and the number of telescopic arms can be reduced or increased according to the length of the steel box girder.

[0034] The guide rail B2 corresponds to a reference guide rail B21 and a multi-section telescopic guide rail that moves synchronously with the multi-section telescopic arms. The multi-section telescopic guide rail includes a first section telescopic guide rail B22 to a fifth section telescopic guide rail B26. Each section of the telescopic guide rail is fixed on a corresponding telescopic arm and moves synchronously with the corresponding telescopic arm. Among them, the first section of the telescopic guide rail B22 can be moved in or out of the reference guide rail B21, and the other sections of the telescopic guide rails can be moved in or out of the previous section of the telescopic guide rail.

[0035] Combination Figures 2 to 4 The side of the reference arm B11 includes a reference arm top wall B111, a reference arm bottom wall B112, a reference arm front wall B113, a reference arm rear wall B114, and a reference arm left wall B115. The side structure of the multi-section telescopic arm is the same as the side structure of the reference arm B11, but the size is different, so that the first section telescopic arm B12 can enter the reference arm B11, and the other sections of the telescopic arm can enter the previous section of the telescopic arm in turn.

[0036] Furthermore, a first telescopic device is provided between the reference arm B11 and the first telescopic arm B12, and the first telescopic device includes a stepper motor B4, a lead screw B5, and a slider B6; the stepper motor B4 is provided at the tail of the reference arm B11, and in this application, the tail refers to the left side of the reference arm B11 or the telescopic arm, and the head refers to the right side of the reference arm B11 or the telescopic arm. A first fixed wall B116 is provided inside the reference arm B11, and the stepper motor B4 is mounted on the first fixed wall B116. The lead screw B5 extends along the axial direction of the reference arm B11 and is connected to the rotating shaft of the stepper motor B5. The slider B6 is provided at the tail of the first telescopic arm B12 and is connected to the lead screw B5.

[0037] exist Figure 4 In the figure, the slider B6 is specifically fixed on the first left side wall B125 of the first telescopic arm B12. When the stepper motor B4 works, it drives the screw B5 to rotate, and the slider B6 can move left and right along the screw B5, thereby driving the first telescopic arm B12 to move in or out of the reference arm B11.

[0038] exist Figure 2 It can be seen that the reference guide rail B21 is a round tube guide rail. Similarly, the first telescopic guide rail B22 to the fifth telescopic guide rail B26 are also round tube guide rails with different diameters, so that the first telescopic guide rail B22 can be inserted into the reference guide rail B21, and other telescopic guide rails can be inserted into the previous telescopic guide rail. The inspection trolley C can move along the reference guide rail B21 and the first telescopic guide rail B22 to the fifth telescopic guide rail B26 in turn to inspect the U ribs inside the steel box girder.

[0039] It should be noted that the reference guide rail B21 and the reference arm B11 are fixedly connected via the support member B7, the tail end (left end) of the first telescopic guide rail B22 is inserted into the reference guide rail B21, and the head end (right end) of the first telescopic guide rail B22 and the first telescopic arm B12 are fixedly connected via the support member B7. Therefore, when the first telescopic arm B12 moves, it will synchronously pull the head end (right end) of the first telescopic guide rail B22 to move.

[0040] Furthermore, the multi-section telescopic arm also includes a second telescopic arm B13, and a second telescopic device is arranged between the first telescopic arm B12 and the second telescopic arm B13. The second telescopic device has the same composition as the first telescopic device, that is, the first telescopic arm B12 and the second telescopic arm B13 are also connected by a stepper motor B4, a lead screw B5 and a slider B6, so that the second telescopic arm B13 can be moved in or out of the first telescopic arm B12.

[0041] Preferably, the third telescopic arm B14 and the fourth telescopic arm B15, as well as the fourth telescopic arm B15 and the fifth telescopic arm B16 can also be connected via a stepping motor B4, a lead screw B5, and a slider B6 to achieve left and right movement.

[0042] Preferably, combined Figures 5 to 8 A third telescopic device is arranged in the second telescopic arm B13, and the third telescopic device includes two front movable pulleys B81 arranged at the tail (left end) of the second telescopic arm B13, and two rear movable pulleys B82 arranged at the head (right end) of the second telescopic arm B13. A front steel wire cable 83 is wound around each front movable pulley B81, one end of the front steel wire cable B83 is fixedly connected to the head (right end) of the first telescopic arm B12, and the other end is fixedly connected to the tail (left end) of the third telescopic arm B14; a rear steel wire cable B84 is wound around each rear movable pulley B82, one end of the rear steel wire cable B84 is fixedly connected to the tail (left end) of the first telescopic arm B12, and the other end is fixedly connected to the head (right end) of the third telescopic arm B14.

[0043] Preferably, a first cross-section reinforcement angle B126 and a first steel wire fixing plate B127 are provided at the tail of the second telescopic arm B12, and the first cross-section reinforcement angle B126 and the first steel wire fixing plate B127 form a rectangular frame. Other telescopic arms have the same structural composition and will not be repeated.

[0044] It can be seen that the two front movable pulleys B81 are fixed on the second left side wall B135 at the tail (left end) of the second telescopic arm B13, one end of the front steel wire cable B83 is fixed on the first steel wire fixing plate B127 at the tail of the second telescopic arm B12, and the other end of the front steel wire cable B83 is fixed on the fourth left side wall B145 at the tail (left end) of the third telescopic arm B14.

[0045] The two rear movable pulleys B82 are mounted and fixed on the second cross-section reinforcement angle 136 of the head (right end) of the second telescopic arm B13, and are located between the inner wall of the second telescopic arm B13 and the outer wall of the third telescopic arm B14. One end of the rear steel cable B84 is fixed to the first left side wall B125 at the tail of the first telescopic arm B12, and the other end is fixedly connected to the fourth left side wall B145 of the head (right end) of the third telescopic arm B14.

[0046] Combination Figure 8 The front steel wire cable B83 is divided into an upper front steel wire cable B831 and a lower front steel wire cable B832, and the rear steel wire cable B84 is divided into an upper rear steel wire cable B841 and a lower rear steel wire cable B842.

[0047] When the first telescopic arm B12 pushes the second telescopic arm B13 to move to the right through the stepper motor, the lead screw and the slider, the length of the upper rear steel cable B841 becomes longer and the length of the lower rear steel cable B842 becomes shorter, so that the third telescopic arm B14 moves to the right; during the rightward movement of the third telescopic arm B14, the length of the upper front steel cable B831 becomes shorter and the length of the lower front steel cable B832 becomes longer. It can be seen that when the first telescopic arm B12 pushes the second telescopic arm B13 to move to the right, the third telescopic arm B14 also moves to the right synchronously to achieve rightward extension; conversely, when the first telescopic arm B12 pulls the second telescopic arm B13 to move to the left, the third telescopic arm B14 also moves to the left synchronously to achieve leftward contraction.

[0048] Furthermore, the multi-section telescopic arm also includes a fourth telescopic arm and a fifth telescopic arm. The third telescopic arm is provided with a fourth telescopic device, and the fourth telescopic arm is provided with a fifth telescopic device. The fourth telescopic device and the fifth telescopic device are of the same composition as the third telescopic device. Please refer to the third telescopic device and will not be repeated here. It can be concluded that when the first telescopic arm B12 pushes the second telescopic arm B13 to move to the right or left, the third telescopic arm B14 to the fifth telescopic arm B16 also move to the right or left synchronously, and the process is linked. And because the front movable pulley B81 and the rear movable pulley B82 are both movable pulleys, the speed of the first telescopic arm B12 pushing or the second telescopic arm B13 is A, then the moving speeds of the third telescopic arm to the fifth telescopic arm are 2A, 3A, and 4A respectively, so the extension and retraction of the support arm B1 can be achieved quickly.

[0049] During the telescopic process, the first telescopic device and the second telescopic device can work simultaneously, that is, the reference arm B11 pushes or pulls the first telescopic arm B12 to move, the first telescopic arm B12 pushes or pulls the second telescopic arm B13 to move, and the third to fifth telescopic arms are linked and move synchronously to realize the overall telescopic extension of the support arm B1.

[0050] Furthermore, a roller row B9 for assisting movement is installed on the inner wall and / or outer wall of the telescopic arm, and a plurality of rollers are arranged on the roller row B9. Fig. 9 and Fig.11 , taking the first telescopic arm B12 as an example, the roller row B9 can be set on the outer wall of the side walls around the first telescopic arm B12, specifically at the tail (left end) of the outer wall, for contacting the inner wall of the reference arm B11, so that during the movement of the first telescopic arm B12, the friction is reduced and the function of assisting the movement is played; similarly, the roller row B9 can be set on the inner wall of the side walls around the first telescopic arm B12, specifically at the head (right end) of the inner wall, for contacting the outer wall of the second telescopic arm B13, so that during the movement of the second telescopic arm B13, the friction is reduced and the function of assisting the movement is played. The reference arm and other telescopic arms have roller rows B9, which will not be repeated.

[0051] like Figure 12 to Figure 14As shown, the support leg B3 includes a first support section B31 and a second support section B32 which can be moved in or out of the first support section B31, a first screw rod B311 is installed vertically inside the first support section B31, a second screw rod B321 is installed vertically inside the second support section B32, the second screw rod B321 is a hollow structure with an external thread and an internal thread, the first screw rod B311 cooperates with the internal thread of the second screw rod B321 and can be rotated to the inside of the second screw rod B321, the top of the first screw rod B311 exposes the first support section B31 and is driven to rotate by a driving mechanism.

[0052] The driving mechanism includes a servo motor B34 and a reducer B35 arranged on the outside of the first support section B31. The rotating shaft of the servo motor B34 is connected to the reducer B35. The reducer B35 is connected to the top of the first screw rod B311 through a belt drive. A first mounting frame B312 is arranged at the top of the first support section B31. The first mounting frame B312 is connected to the top of the first screw rod B311 through a bearing, so that the first screw rod B311 can rotate relative to the first mounting frame B312.

[0053] A second mounting frame B322 is provided at the top of the second support section B32, and the second mounting frame B322 is connected to the top of the second screw rod B321 through a bearing, so that the second screw rod B321 can rotate relative to the second mounting frame B322; the support leg B3 also includes a third support section B33, and the third support section B33 can be moved in or out of the second support section B32, and a nut B331 adapted to the second screw rod B321 is installed inside the third support section B33, and the nut B331 cooperates with the external thread of the second screw rod B321.

[0054] After the servo motor B34 starts working, it drives the first screw rod B311 to rotate, so that the first screw rod B311 can move in or out of the second screw rod B321. Since the second screw rod B321 can also rotate, the third support section B33 can also move in or out of the second support section B32.

[0055] Preferably, the top of the first support section B31 is closed by a sealing cover, and the sealing cover and the support arm B1 are movably connected by a hinge.

[0056] Preferably, in the present invention, the support leg B3 is connected to the lower end of the head (right end) of the first telescopic arm B12 through a hinge, and can of course be fixed at a suitable position according to the force applied to the entire support arm B1.

[0057] It can be seen that the present invention discloses a support structure for detecting U-ribs inside a steel box girder, including a support arm and guide rails located on both sides of the support arm; the support arm includes a reference arm and a multi-section telescopic arm, wherein the first section of the telescopic arm can be moved in or out of the reference arm, and the other sections of the telescopic arm can be moved in or out of the previous section of the telescopic arm; the guide rails correspondingly include a reference guide rail and a multi-section telescopic guide rail that moves synchronously with the multi-section telescopic arm, wherein the first section of the telescopic guide rail can be moved in or out of the reference guide rail, and the other sections of the telescopic guide rail can be moved in or out of the previous section of the telescopic guide rail. The present invention provides convenience for the detection trolley to perform detection inside the steel box girder through the characteristics of the support arm and the guide rail being able to be telescopic.

[0058] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A support structure for detecting U-ribs inside a steel box girder. Features: It includes a support arm and guide rails on both sides of the support arm, so that the inspection trolley can move along the guide rails to inspect the U ribs inside the steel box girder; the support arm includes a reference arm and a multi-section telescopic arm, wherein the first section of the telescopic arm can be moved in or out of the reference arm, and the other sections of the telescopic arm can be moved in or out of the previous section of the telescopic arm; the guide rails correspondingly include a reference guide rail and a multi-section telescopic guide rail that moves synchronously with the multi-section telescopic arms, wherein the first section of the telescopic guide rail can be moved in or out of the reference guide rail, and the other sections of the telescopic guide rail can be moved in or out of the previous section of the telescopic guide rail.

2. The support structure for detecting U-ribs inside a steel box girder according to claim 1, Features: A first telescopic device is arranged between the reference arm and the first telescopic arm, and the first telescopic device includes a stepping motor, a lead screw, and a slider; the stepping motor is arranged at the tail of the reference arm, the lead screw extends along the axial direction of the reference arm and is connected to the rotating shaft of the stepping motor, and the slider is arranged at the tail of the first telescopic arm and is cooperatively connected with the lead screw.

3. The support structure for detecting U-ribs inside a steel box girder according to claim 2, Features: The multi-section telescopic arm also includes a second telescopic arm. A second telescopic device is arranged between the first telescopic arm and the second telescopic arm. The second telescopic device has the same composition as the first telescopic device.

4. The support structure for detecting U-ribs inside a steel box girder according to claim 3, Features: The multi-section telescopic arm also includes a third telescopic arm, and a third telescopic device is arranged in the second telescopic arm. The third telescopic device includes two front movable pulleys arranged at the tail of the second telescopic arm, and two rear movable pulleys arranged at the head of the second telescopic arm. Each of the front movable pulleys is respectively wound with a front steel wire cable, one end of the front steel wire cable is fixedly connected to the head of the first telescopic arm, and the other end is fixedly connected to the tail of the third telescopic arm; each of the rear movable pulleys is respectively wound with a rear steel wire cable, one end of the rear steel wire cable is fixedly connected to the tail of the first telescopic arm, and the other end is fixedly connected to the head of the third telescopic arm.

5. The support structure for detecting U-ribs inside a steel box girder according to claim 4, Features: The multi-section telescopic arm also includes a fourth telescopic arm and a fifth telescopic arm. The third telescopic arm is provided with a fourth telescopic device, and the fourth telescopic arm is provided with a fifth telescopic device. The fourth telescopic device and the fifth telescopic device have the same composition as the third telescopic device.

6. The support structure for detecting U-ribs inside a steel box girder according to claim 1, Features: Roller rows for assisting movement are installed on the inner wall and / or outer wall of the telescopic arm.

7. The support structure for detecting U-ribs inside a steel box girder according to any one of claims 1 to 6, Features: The lower end of the support arm is movably connected with a support leg.

8. The support structure for detecting U-ribs inside a steel box girder according to claim 7, Features: The supporting leg includes a first supporting section and a second supporting section that can be moved in or out of the first supporting section, a first screw rod is installed vertically inside the first supporting section, a second screw rod is installed vertically inside the second supporting section, the second screw rod is a hollow structure, the first screw rod can be rotated to the inside of the second screw rod, the top of the first screw rod is exposed from the first supporting section and is driven to rotate by a driving mechanism.

9. The support structure for detecting U-ribs inside a steel box girder according to claim 8, Features: The driving mechanism includes a servo motor and a reducer arranged outside the first supporting section. The rotating shaft of the servo motor is connected to the reducer, and the reducer is connected to the top of the first screw rod through a belt drive.

10. The support structure for detecting U-ribs inside a steel box girder according to claim 9, Features: The support leg also includes a third support section, which can be moved into or out of the second support section, and a nut matched with the second screw rod is installed inside the third support section.

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