Bridge bottom inspection vehicle replacement construction method

Abstract

The invention provides a bridge beam bottom inspection vehicle replacement construction method, and relates to the technical field of bridge beam bottom inspection vehicle replacement, and the bridge beam bottom inspection vehicle replacement construction method comprises the steps that hoisting equipment is arranged on a bridge floor, and hoisting equipment is installed on an inspection vehicle track at the beam bottom; when no working face exists under the bridge, new inspection vehicle segments are transported to the overhaul channel on the bridge floor and spliced, and the new inspection vehicle is lowered to the position below the bridge floor through hoisting equipment; the hoisting equipment and the hoisting equipment drive the new inspection vehicle to rotate around one end of the new inspection vehicle; lifting the turned new inspection vehicle in place; and the original inspection vehicle is dismantled through the hoisting equipment and the hoisting equipment. The bridge beam bottom inspection vehicle replacement construction method has the advantages that the safety risk is low, the time for occupying channels and lanes is short, and damage to the beam bottom is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of replacing inspection vehicles at the bottom of bridge girders, and particularly to a construction method for replacing inspection vehicles at the bottom of bridge girders. Background Art

[0002] As a key accessory facility for long-span bridges (such as suspension bridges, cable-stayed bridges, and concrete-filled steel tube arch bridges), the inspection vehicle at the bottom of bridge girders is long-term exposed to harsh environments such as high humidity, salt spray, and acid rain. Its core components (track system, drive motor, support structure) face serious corrosion and aging problems. Especially for cross-sea bridges, the penetration of chloride ions in the marine atmospheric environment will accelerate the corrosion of metal materials, resulting in faults such as track deformation, motor insulation failure, and transmission system jamming, seriously affecting the safety and continuity of maintenance operations.

[0003] Currently, for severely corroded inspection vehicle systems, the main repair solution is "partial demolition + overall replacement". Due to the inability to close traffic on existing bridges for a long time and limited working surfaces, the method of adding a truss crane to a newly built bridge cannot be applied. Currently, when replacing the inspection vehicle at the bottom of the bridge girder, it is usually necessary to weld several anchor points at the bottom of the girder, which causes certain damage to the original structure.

[0004] Therefore, the current inspection vehicle at the bottom of bridge girders has the disadvantages of high safety risks in the replacement method, long occupation time of the waterway and lane, and often setting welding points on the outer surface of the steel box girder, which will damage the existing bridge structure. Summary of the Invention

[0005] The purpose of the present invention is to provide a construction method for replacing inspection vehicles at the bottom of bridge girders, which has the advantages of low safety risks, short occupation time of the waterway and lane, and reduced damage to the bottom of the girder.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] The present invention provides a construction method for replacing inspection vehicles at the bottom of bridge girders, including:

[0008] Arranging a hoisting device on the bridge deck and installing a lifting device on the inspection vehicle track at the bottom of the girder;

[0009] When there is no working surface under the bridge: transporting the new inspection vehicle segment to the maintenance passage on the bridge deck and splicing it; lowering the new inspection vehicle below the bridge deck through the hoisting device; driving the new inspection vehicle to rotate around one end of itself through the hoisting device and the lifting device; lifting the rotated new inspection vehicle to the place; and removing the original inspection vehicle through the hoisting device and the lifting device.

[0010] In an optional embodiment, arranging a hoisting device on the bridge deck and installing a lifting device on the inspection vehicle track at the bottom of the girder specifically includes:

[0011] Arrange a first hoisting device and a second hoisting device on the bridge deck at intervals along the length direction of the bridge deck, and arrange a third hoisting device on the side of the second hoisting device along the width direction of the bridge deck;

[0012] A plurality of the lifting devices are installed on the inspection vehicle track at the bottom of the beam, and each of the lifting devices is located on the inspection vehicle track at the bottom of the beam between the second lifting device and the third lifting device.

[0013] In an optional implementation manner, lowering the new inspection vehicle below the bridge deck by means of the lifting equipment specifically includes:

[0014] The new inspection vehicle is lowered below the bridge deck by the first lifting equipment and the second lifting equipment.

[0015] In an optional embodiment, after the new inspection vehicle is lowered below the bridge deck by the lifting equipment, the method further includes:

[0016] The rope guiding device connects the end of the new inspection vehicle away from the second lifting device to the third lifting device through a first traction rope, and the rope guiding device connects the new inspection vehicle to each of the lifting devices through a second traction rope.

[0017] In an optional implementation manner, the new inspection vehicle is driven to rotate around one end of itself by the hoisting device and the lifting device, specifically including:

[0018] The second lifting device does not move, and the first lifting device lowers one end of the new inspection vehicle until the new inspection vehicle is set vertically;

[0019] The third lifting device and each of the hoisting devices lift the new inspection vehicle so that the new inspection vehicle rotates around one end connected to the second lifting device until the new inspection vehicle is placed horizontally.

[0020] In an optional embodiment, after the rotated new inspection vehicle is lifted into place, the method further includes:

[0021] The new inspection vehicle is temporarily positioned, and the drive system and the electronic control system of the new inspection vehicle are installed.

[0022] In an optional implementation manner, dismantling the original inspection vehicle by using the hoisting equipment and the lifting equipment specifically includes:

[0023] Connecting the first lifting device, the second lifting device, the third lifting device and each of the lifting devices to the original inspection vehicle, driving the original inspection vehicle to rotate around one end of itself, the rotation direction of the original inspection vehicle being opposite to the rotation direction of the new inspection vehicle;

[0024] Lift the rotated original inspection vehicle into place and transport it away.

[0025] In an alternative embodiment, it further includes:

[0026] Pre-fabricate inspection vehicle segments at the bottom of the precast beam in the factory, and detect and repair the existing inspection vehicle track.

[0027] In an alternative embodiment, when there is an operating surface under the bridge:

[0028] Use the hoisting equipment and the lifting equipment to tow the original inspection vehicle, change the self-weight of the original inspection vehicle borne by the drive system to be borne by the hoisting equipment and the lifting equipment, and remove the original inspection vehicle.

[0029] In an alternative embodiment, when there is an operating surface under the bridge, it further includes:

[0030] Clean the area under the bridge and remove the original inspection vehicle, move the new inspection vehicle to the lifting position and connect the hoisting equipment and the lifting equipment, and lift the new inspection vehicle into place through the hoisting equipment and the lifting equipment.

[0031] The construction method for replacing the inspection vehicle at the bottom of the bridge beam provided by the present invention can achieve the following beneficial effects:

[0032] Compared with the prior art, the construction method for replacing the inspection vehicle at the bottom of the bridge beam provided by the present invention can install a new inspection vehicle and remove an old inspection vehicle in the case of no operating surface under the bridge, such as when the area under the bridge is a water surface or a cliff, with a short occupation time for the waterway and lane, and the lifting equipment is arranged on the existing track, reducing damage to the bottom of the beam. At the same time, by arranging the hoisting equipment and using it in cooperation with the lifting equipment, the risk of replacing the inspection vehicle is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a flow chart of the construction method for replacing the inspection vehicle at the bottom of the bridge beam provided by the embodiment of the present invention;

[0035] Figure 2 It is a front view of the bridge when the hoisting equipment lowers the new inspection vehicle provided by the embodiment of the present invention;

[0036] Figure 3Front view of the bridge when the second hoisting device provided in the embodiment of the present invention does not operate and the first hoisting device lowers one end of the new inspection vehicle;

[0037] Figure 4 Side view of the bridge after the third hoisting device and each hoisting device provided in the embodiment of the present invention are connected to the new inspection vehicle;

[0038] Figure 5 Side view of the bridge when the new inspection vehicle provided in the embodiment of the present invention rotates;

[0039] Figure 6 Side view of the bridge after the new inspection vehicle provided in the embodiment of the present invention finishes rotating;

[0040] Figure 7 Side view of the bridge after the new inspection vehicle provided in the embodiment of the present invention is lifted in place.

[0041] Icon: 1 - Hoisting device; 11 - First hoisting device; 12 - Second hoisting device; 13 - Third hoisting device; 2 - Hoisting equipment; 3 - New inspection vehicle; 4 - First towing rope; 5 - Second towing rope. Detailed implementation manners

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0043] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0045] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0046] This embodiment aims to provide a construction method for replacing an inspection vehicle at the bottom of a bridge beam. As Figures 1 to 3 shown, it includes arranging a hoisting device 1 on the bridge deck and installing a lifting device 2 on the inspection vehicle track at the bottom of the beam.

[0047] When there is no working surface under the bridge: Transport the 3 segments of the new inspection vehicle to the maintenance passage on the bridge deck and splice them. Lower the new inspection vehicle 3 below the bridge deck through the hoisting device 1. Drive the new inspection vehicle 3 to rotate around one end of itself through the hoisting device 1 and the lifting device 2. Lift the rotated new inspection vehicle 3 to the proper position. Remove the original inspection vehicle through the hoisting device 1 and the lifting device 2.

[0048] In the above construction method, first arrange the hoisting device 1 on the bridge deck and install the lifting device 2 on the inspection vehicle track at the bottom of the beam. Subsequently, as Figure 2 shown, transport the 3 segments of the new inspection vehicle to the maintenance passage on the bridge deck and splice them. Lower the new inspection vehicle 3 below the bridge deck through the hoisting device 1. Subsequently, as Figures 3 to 5 shown, rotate the new inspection vehicle 3 around one end of the new inspection vehicle 3 through the hoisting device 1 and the lifting device 2. Subsequently, as Figure 6 shown, lift the rotated new inspection vehicle 3 to the proper position. Finally, remove the original inspection vehicle through the hoisting device 1 and the lifting device 2.

[0049] In the above method, when there is no working surface under the bridge, such as when the area under the bridge is water, a cliff, etc., the installation of the new inspection vehicle 3 and the removal of the old inspection vehicle can be realized. The occupation time of the waterway and the lane is short, and the lifting device 2 is arranged on the existing track, reducing the damage to the bottom of the beam. The lifting device 2 can be used in cooperation with the hoisting device 1 to jointly tow the new inspection vehicle 3, reducing the risk of replacing the inspection vehicle.

[0050] In an alternative embodiment, arranging the hoisting device 1 on the bridge deck and installing the lifting device 2 on the inspection vehicle track at the bottom of the beam specifically includes:

[0051] As Figure 2 shown, arrange the first hoisting device 11 and the second hoisting device 12 at intervals along the length direction of the bridge deck. As Figure 4 shown, arrange the third hoisting device 13 on the side of the second hoisting device 12 along the width direction of the bridge deck.

[0052] As Figure 4As shown, a plurality of lifting devices 2 are installed on the inspection vehicle track at the bottom of the beam, and each lifting device 2 is located on the inspection vehicle track at the bottom of the beam between the second lifting device 12 and the third lifting device 13 .

[0053] In the above embodiment, when the segments of the new inspection vehicle 3 are spliced in the inspection channel, the new inspection vehicle 3 can be lowered from one side of the bridge by the first lifting device 11 and the second lifting device 12, and then the new inspection vehicle 3 is rotated around one end of itself by the traction of the third lifting device 13, so that Figure 6 Shown placed directly below the bridge.

[0054] The above-mentioned embodiment can realize the turning and swinging of the new inspection vehicle from the bottom of the side of the bridge by setting up the first lifting equipment 11, the second lifting equipment 12, the third lifting equipment 13 and several lifting equipment 2. There is no need to set up a working surface under the bridge. By using multiple devices for pulling, the construction safety is guaranteed and the damage to the bottom of the beam is reduced.

[0055] The first hoisting equipment 11, the second hoisting equipment 12 and the third hoisting equipment 13 can all be equipment with a certain hoisting capacity, such as a crane.

[0056] In addition, the lifting equipment 2 can be an electric hoist crane or the like.

[0057] In order to avoid concentrated force, the installation position of the lifting device 2 needs to be in a different section from that of the original inspection vehicle.

[0058] In an optional embodiment, the new inspection vehicle 3 is lowered below the bridge deck by the lifting device 1 , which specifically includes: lowering the new inspection vehicle 3 from the side of the bridge to below the bridge deck by the first lifting device 11 and the second lifting device 12 .

[0059] The first hoisting device 11 and the second hoisting device 12 may be arranged close to the same side of the bridge deck along the width direction of the bridge deck, so as to lower the new inspection vehicle 3 below the bridge deck on this side.

[0060] Specifically, the first lifting device 11 may be connected to one end of the new inspection vehicle 3 , and the second lifting device 12 may be connected to the other end of the new inspection vehicle 3 .

[0061] In an optional embodiment, after the new inspection vehicle 3 is lowered below the bridge deck by the lifting equipment 1, it also includes: the rope-guiding device connects the end of the new inspection vehicle 3 away from the second lifting equipment 12 to the third lifting equipment 13 through the first traction rope 4, and the rope-guiding device connects the new inspection vehicle 3 to each lifting equipment 2 through the second traction rope 5.

[0062] In this way, the third hoisting device 13 and each hoisting device 2 can cooperate with the first hoisting device 11 and the second hoisting device 12 to realize the hoisting and turning of the new inspection vehicle 3, ensuring that the new inspection vehicle can be stably turned to directly below the bridge.

[0063] Among them, to reduce the construction cost and simplify the construction steps, when there is no safety risk in the original inspection vehicle, the rope guiding device can use the original inspection vehicle on-site. During construction, one end of the first towing rope 4 and the second towing rope 5 can be pre-connected to the preset position of the new inspection vehicle 3 in advance, and then the other end of the first towing rope 4 is connected to the third hoisting device 13 through the original inspection vehicle, and the other end of the second towing rope 5 is connected to each hoisting device 2.

[0064] In an alternative embodiment, the hoisting device 1 and the hoisting device 2 drive the new inspection vehicle 3 to rotate around one end of itself, specifically including:

[0065] As Figure 3 shown, the second hoisting device 12 does not operate, and the first hoisting device 11 lowers one end of the new inspection vehicle 3 until the new inspection vehicle 3 is vertically arranged;

[0066] As Figure 4 and Figure 5 shown, the third hoisting device 13 and the two hoisting devices 2 lift the new inspection vehicle 3 so that the new inspection vehicle 3 swings counterclockwise around the end connected to the second hoisting device 12 until the new inspection vehicle 3 is horizontally arranged.

[0067] In the above embodiment, since the second hoisting device 12 does not operate, when the first hoisting device 11 lowers the new inspection vehicle 3 until the new inspection vehicle 3 is vertically arranged, the new inspection vehicle 3 just falls below the second hoisting device 12. Since the third hoisting device 13 is on the side of the second hoisting device 12 in the bridge width direction, and each hoisting device 2 is located between the second hoisting device 12 and the third hoisting device 13, during the process of the third hoisting device 13 and each hoisting device 2 lifting the new inspection vehicle 3, as Figures 5 to 6 shown, the new inspection vehicle 3 will swing from the side of the bridge to directly below the bridge, and the extending direction of the new inspection vehicle 3 gradually becomes parallel to the bridge width direction.

[0068] In an alternative embodiment, after the rotated new inspection vehicle 3 is lifted in place, it further includes: temporarily positioning the new inspection vehicle 3, and after ensuring the stability of the position of the new inspection vehicle 3, installing the drive system and the electric control system of the new inspection vehicle 3.

[0069] Among them, the stability of the new inspection vehicle 3 can be ensured by welding temporary positioning steel bars.

[0070] In an optional embodiment, after the new inspection vehicle 3 is installed, the connection between the lifting equipment 1 and the hoisting equipment 2 and the new inspection vehicle 3 can be cancelled, and the original inspection vehicle can be dismantled by the lifting equipment 1 and the hoisting equipment 2, specifically including: connecting the first lifting equipment 11, the second lifting equipment 12, the third lifting equipment 13 and each hoisting equipment 2 to the original inspection vehicle, driving the original inspection vehicle to rotate around one end of itself, and the rotation direction of the original inspection vehicle is opposite to the rotation direction of the new inspection vehicle 3; lifting the rotated original inspection vehicle into place and transporting it away.

[0071] The above-mentioned steps of dismantling the original inspection vehicle can be regarded as the opposite of the steps of installing the new inspection vehicle 3. After the second lifting equipment 12, the third lifting equipment 13 and each lifting equipment 2 are connected to the original inspection vehicle, the second lifting equipment 12 does not move, and the third lifting equipment 13 and each lifting equipment 2 lower the original inspection vehicle, so that the original inspection vehicle swings around the end connected to the second lifting equipment 12 until the original inspection vehicle is set vertically, and then the first lifting equipment 11 is connected to the end of the original inspection vehicle away from the second lifting equipment 12, and the first lifting equipment 11 lifts the original inspection vehicle until the original inspection vehicle is set horizontally.

[0072] Therefore, in the above implementation method, through the various hoisting equipment 1 and the lifting equipment 2, not only the installation of the new inspection vehicle 3 can be achieved, but also the dismantling of the original inspection vehicle can be achieved, so as to realize the operation when there is no working surface under the bridge.

[0073] After the original inspection car is dismantled, the new inspection car 3 can be moved to the position of the original inspection car to complete the replacement of the old and new inspection cars.

[0074] In an optional embodiment, it also includes: prefabricating the bottom beam inspection vehicle segment in the factory, and inspecting and repairing the existing inspection vehicle track by setting up scaffolding, using drones, etc.

[0075] Since the new inspection vehicle 3 cannot be directly hoisted due to the obstruction of the inclined cables, the above steps facilitate the transportation of the new inspection vehicle 3 to the bridge deck in stages and sections.

[0076] In an optional embodiment, when there is a working surface under the bridge:

[0077] The original inspection vehicle is towed by the hoisting device 1 and the lifting device 2, and the weight of the original inspection vehicle is changed from being borne by the drive system to being borne by the hoisting device 1 and the lifting device 2. At this time, the connection parts with the track and the bridge can be removed as designed, and the original inspection vehicle can be slowly and horizontally lowered by the hoisting device 1 to complete the dismantling of the original inspection vehicle.

[0078] In the above steps, two lifting devices 1 are used to pull the two ends of the original inspection vehicle respectively, and at least one lifting device 2 is used to pull the middle position of the original inspection vehicle.

[0079] In an alternative embodiment, when there is a working surface under the bridge, it further includes:

[0080] Clean the area under the bridge and remove the original inspection vehicle, move the new inspection vehicle 3 to the lifting position and connect the lifting equipment 1 and the hoisting equipment 2. As Figure 7 shown, lift the new inspection vehicle 3 in place by the lifting equipment 1 and the hoisting equipment 2. Subsequently, temporary positioning steel bars can be welded between the track and the new inspection vehicle 3, and the drive system and the electric control system of the new inspection vehicle 3 can be installed, thus completing the replacement of the old and new inspection vehicles.

[0081] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction method for replacing an inspection vehicle at the bottom of a bridge beam, characterized in that Including: Arrange a hoisting device (1) on the bridge deck and install a lifting device (2) on the inspection vehicle track at the bottom of the beam. When there is no working surface under the bridge: Transport the new inspection vehicle (3) segments to the maintenance passage on the bridge deck and splice them. Lower the new inspection vehicle (3) below the bridge deck through the hoisting device (1); Drive the new inspection vehicle (3) to rotate around one end of itself through the hoisting device (1) and the lifting device (2); Lift the rotated new inspection vehicle (3) into place; Remove the original inspection vehicle through the hoisting device (1) and the lifting device (2).

2. The construction method for replacing the inspection vehicle at the bottom of the bridge beam according to claim 1, characterized in that Arrange a hoisting device (1) on the bridge deck and install a lifting device (2) on the inspection vehicle track at the bottom of the beam, specifically including: Arrange the first hoisting device (11) and the second hoisting device (12) at intervals along the length direction of the bridge deck, and arrange the third hoisting device (13) on the side of the second hoisting device (12) along the width direction of the bridge deck. Install a plurality of the lifting devices (2) on the inspection vehicle track at the bottom of the beam, and each of the lifting devices (2) is located on the inspection vehicle track at the bottom of the beam between the second hoisting device (12) and the third hoisting device (13).

3. The bridge girder bottom inspection vehicle replacement construction method according to claim 2, wherein Lower the new inspection vehicle (3) below the bridge deck through the hoisting device (1), specifically including: Lower the new inspection vehicle (3) below the bridge deck through the first hoisting device (11) and the second hoisting device (12).

4. The construction method for replacing the inspection vehicle at the bottom of the bridge beam according to claim 3 is characterized in that, After lowering the new inspection vehicle (3) below the bridge deck through the hoisting device (1), it further includes: The rope guiding device connects one end of the new inspection vehicle (3) away from the second hoisting device (12) to the third hoisting device (13) through the first towing rope (4), and the rope guiding device connects the new inspection vehicle (3) to each of the lifting devices (2) through the second towing rope (5).

5. The construction method for replacing the inspection vehicle at the bottom of a bridge beam according to claim 4, characterized in that, Drive the new inspection vehicle (3) to rotate around one end of itself through the hoisting device (1) and the lifting device (2), specifically including: The second hoisting device (12) does not operate, and the first hoisting device (11) lowers one end of the new inspection vehicle (3) until the new inspection vehicle (3) is vertically arranged. The third hoisting device (13) and each of the lifting devices (2) lift the new inspection vehicle (3) so that the new inspection vehicle (3) rotates around the end connected to the second hoisting device (12) until the new inspection vehicle (3) is horizontally arranged.

6. The construction method for replacing the inspection vehicle at the bottom of the bridge beam according to claim 1 is characterized in that, After lifting the rotated new inspection vehicle (3) into place, it further includes: Temporarily position the new inspection vehicle (3) and install the drive system and the electric control system of the new inspection vehicle (3).

7. The bridge girder bottom inspection vehicle replacement construction method according to claim 2, characterized in that Remove the original inspection vehicle through the hoisting device (1) and the lifting device (2), specifically including: Connect the first hoisting device (11), the second hoisting device (12), the third hoisting device (13) and each of the lifting devices (2) to the original inspection vehicle, and drive the original inspection vehicle to rotate around one end of itself. The rotation direction of the original inspection vehicle is opposite to the rotation direction of the new inspection vehicle (3). Lift the rotated original inspection vehicle into place and transport it away.

8. The construction method for replacing the inspection vehicle at the bottom of the bridge beam according to any one of claims 1-7, characterized in that It further includes: At the prefabricated beam bottom inspection vehicle section in the factory, detect and repair the existing inspection vehicle track.

9. The construction method for replacing the inspection vehicle at the bottom of the bridge beam according to any one of claims 1 to 7, characterized in that When there is an operating surface under the bridge: Use the lifting device (1) and the hoisting device (2) to tow the original inspection vehicle. Change the self-weight of the original inspection vehicle borne by the drive system to be borne by the lifting device (1) and the hoisting device (2), and remove the original inspection vehicle.

10. The construction method for replacing the inspection vehicle at the bottom of a bridge beam according to claim 9, characterized in that, When there is an operating surface under the bridge, it also includes: Clean the site under the bridge and remove the original inspection vehicle. Move the new inspection vehicle (3) to the lifting position and connect the lifting device (1) and the hoisting device (2). Lift the new inspection vehicle (3) in place through the lifting device (1) and the hoisting device (2).

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