High-efficiency demolition device for cable bearing type long-span bridge and construction method

Abstract

The cable bearing type large-span bridge efficient dismantling device comprises two sets of assembly type supporting frames and a plurality of rail trolley assemblies, the two sets of assembly type supporting frames are oppositely distributed and span a bridge, and rails are arranged on the assembly type supporting frames; the multiple track trolley assemblies are movably arranged on tracks of the two sets of assembly type supporting frames correspondingly, a bridge is divided into multiple to-be-disassembled bridge blocks through cutting, and the multiple to-be-disassembled bridge blocks except for the head bridge block and the tail bridge block which are provided with bridge piers at the bottoms; the rest to-be-disassembled bridge blocks are connected with the corresponding rail trolley assemblies through cables, and the multiple rail trolley assemblies move on the rails to sequentially hoist the to-be-disassembled bridge blocks connected with the rail trolley assemblies to the close bridge abutments to be broken and decomposed; the assembly type supporting frame comprises a first frame body and a second frame body, the first frame body and the second frame body are symmetrically distributed on the left side and the right side of a bridge respectively, rotating devices are arranged at the bottoms of one ends of the first frame body and the second frame body respectively and connected with a bridge abutment, and the other ends of the first frame body and the second frame body are detachably connected.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge demolition, and in particular to a cable-supported large-span bridge efficient demolition device and a construction method. Background Art

[0002] At present, the bridge engineering community has accumulated certain experience in bridge demolition design theory, construction methods and technologies. In particular, in recent years, with the research, development and utilization of static cutting technology, crushing technology, jacking technology and hoisting technology, some new construction technologies that can be used for bridge demolition have emerged. However, the demolition equipment and construction technology for bridges with restricted spaces below (i.e., when the lower part of the bridge is inaccessible, such as when the lower river cannot be supported due to navigation, flood control, etc., and the lower river management department does not allow temporary support to be set up) are still unclear. In addition, the bridge erection machine can be used for such bridge demolition after modification, but the installation and disassembly costs of the bridge erection machine for bridge demolition are expensive, and the construction efficiency is low. Summary of the invention

[0003] In view of the above-mentioned technical problems in the demolition of existing bridges with confined lower spaces, the purpose of the present invention is to provide a cable-supported large-span bridge efficient demolition device and construction method. This scheme can achieve efficient demolition of large-span bridges with confined lower spaces, eliminating the need to set up multiple lower supports or even use large bridge-building machines and other construction equipment in the traditional large-span bridge demolition process, thereby achieving bridge demolition and saving construction costs to a certain extent.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a cable-supported large-span bridge efficient dismantling device and construction method, comprising two groups of assembled support frames and a plurality of rail trolley assemblies, wherein the two groups of assembled support frames are relatively distributed and arranged across the bridge, the assembled support frames are provided with rails, and the plurality of rail trolley assemblies are movably arranged on the rails of the two groups of assembled support frames, respectively, the bridge is divided into a plurality of bridge blocks to be dismantled by cutting, and among the plurality of bridge blocks to be dismantled, except for the first and last bridge blocks to be dismantled with piers at the bottom, the remaining bridge blocks to be dismantled correspond to the plurality of rail trolley assemblies, the rail trolley assemblies are connected to the bridge blocks to be dismantled by cables, and the plurality of rail trolley assemblies move on the rails to sequentially lift the bridge blocks to be dismantled connected thereto to the nearby abutments and break and decompose them;

[0005] The assembled support frame includes a first frame and a second frame. The first frame and the second frame are symmetrically distributed on the left and right sides of the bridge respectively. The bottom of one end of the first frame and the second frame is respectively provided with a rotating device connected to the abutment, and the other end of the first frame and the second frame are connected in a detachable manner.

[0006] Furthermore, the first frame and the second frame have the same structure, both comprising a horizontal frame and a vertical frame, the horizontal frame is horizontally arranged, and a track is provided on the top thereof, on which the track trolley assembly can be arranged;

[0007] The vertical frame is connected to one end of the horizontal frame, and a rotating device is provided at the bottom of the vertical frame. The rotating device is connected to the abutment, and the vertical frame can be rotated by the rotating device;

[0008] The cross frame of the first frame body is butted against the cross frame of the second frame body at the center of the bridge span and connected via a connecting pin.

[0009] Furthermore, the rail trolley assembly is composed of a first lifting trolley and a second lifting trolley having the same structure;

[0010] The first lifting trolley and the second lifting trolley are provided with a front axle and a rear axle at both ends of the bottom, respectively, and rail wheels are connected to both ends of the front axle and the rear axle. The first lifting trolley and the second lifting trolley are movably arranged on the rails in the two sets of assembled support frames through the rail wheels.

[0011] The first lifting trolley and the second lifting trolley are equipped with a control device, a power device and a lifting device, and the first lifting trolley and the second lifting trolley respectively realize synchronous travel along two tracks;

[0012] The front axle and the rear axle are respectively connected with cables.

[0013] The power unit is connected to the track wheel to provide driving force for the track wheel. The lifting device is connected to the front axle and the rear axle respectively, and can drive the front axle and the rear axle to rotate, so that the cable can be lifted and lowered vertically. The cable is used to connect to the bridge block to be demolished. The control device is connected to the power unit and the lifting device respectively, and is used to control the power unit and the lifting device.

[0014] In order to achieve the above object, the present invention provides a construction method of a cable-supported large-span bridge efficient demolition device, which is used for any one of the above items, and the construction method comprises:

[0015] S1: Determine the span of the bridge to be dismantled, the length and position of each bridge block to be dismantled, the weight of each bridge block to be dismantled, the construction period, etc. according to the design drawings. According to the above factors and the calculation of the structural bearing capacity, determine the structural span, rod type, assembly form, number of bridge blocks to be dismantled, number of rail trolley assemblies, wheelbase of each rail trolley assembly, lifting power tonnage, driving power tonnage and other parameters of the assembled support frame;

[0016] S2: Use a small truck crane to install the assembled support frame, use a boom truck to install the rail trolley assembly and cables, and fix the two ends of the lifting cable on the front and rear axles of the lifting trolley after passing it around the bottom of the bridge block to be demolished. After the above work is completed, use a diamond wire saw to cut the bridge according to the designed split seam position according to the design requirements and position;

[0017] S3: Using a truck crane at the abutment or roadbed, two bridge blocks 300 to be dismantled on the tops of the left and right bridge piers are lifted off and crushed. After the crushing and decomposition is completed, an excavator and a dump truck are used to transport the crushed garbage out;

[0018] S4: The two rail trolley assemblies located on the outside respectively lift the corresponding bridge blocks to be dismantled and drive along the rails to the abutments on both sides. During the process, the lifting device rotates the front and rear axles of the lifting trolley at the same time to lift the segmented bridge blocks to be dismantled upwards, and the lifting height is ensured not to touch the abutments;

[0019] S5: After the two rail trolley assemblies on the outside reach the top of the abutment, they slowly lower the bridge blocks to be dismantled to the abutment and then crush them. After the crushing is completed, the crushed garbage is transported out using an excavator and a dump truck, and the corresponding rail trolley assemblies are removed at the same time;

[0020] S6: Repeat the above S4-S5 until the remaining bridge blocks to be demolished are dismantled, lifted away, and crushed;

[0021] S7: disconnecting the cross frame of the first frame from the cross frame of the second frame, and then rotating the rotating devices at one end of the first frame and the second frame to turn the first frame and the second frame to the shore for dismantling and recycling.

[0022] The cable-supported large-span bridge efficient dismantling device and construction method provided by the present invention can realize the efficient dismantling of large-span bridges with limited lower space, avoid the need to set up multiple lower supports in the traditional large-span bridge dismantling process, and even use large-scale bridge-building machines and other construction equipment, thereby realizing bridge dismantling and saving construction costs to a certain extent.

[0023] Compared with the prior art, the cable-supported large-span bridge efficient dismantling device and construction method provided by the present invention have the following beneficial effects:

[0024] (1) The construction equipment and method can realize the efficient demolition of large-span bridges with limited lower space, eliminating the need to set up multiple lower supports or even use large bridge erection machines and other construction equipment in the traditional large-span bridge demolition process, thereby achieving bridge demolition and saving construction costs to a certain extent;

[0025] (2) The bridge demolition equipment and method use multiple lifting trolleys to achieve efficient demolition of the bridge to be demolished. The lifting trolleys have high running speed, high safety and can be repeatedly used;

[0026] (3) The construction equipment and construction method can ensure that the entire demolition process is safe and environmentally friendly. The main decomposition process is carried out on the shore abutment or roadbed, which can achieve the precise separation of demolition waste and realize the recycling and reuse of demolition waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] Figure 1 A schematic diagram of the actual application of the cable-supported large-span bridge efficient demolition device provided by the present invention;

[0029] Figure 2 A side view of the cable-supported large-span bridge efficient dismantling device provided by the present invention;

[0030] Figure 3 A side view of a rail trolley assembly in a cable-supported large-span bridge efficient demolition device provided by the present invention;

[0031] Figure 4 A schematic diagram of step 3 in the construction method of the cable-supported large-span bridge efficient dismantling device provided by the present invention;

[0032] Figure 5 A schematic diagram of step 4 in the construction method of the cable-supported large-span bridge efficient dismantling device provided by the present invention;

[0033] Figure 6 A schematic diagram of step 5 in the construction method of the cable-supported large-span bridge efficient dismantling device provided by the present invention;

[0034] Illustration Description:

[0035] Assembled support frame 100, rail trolley assembly 200, bridge block to be dismantled 300;

[0036] The first frame 110, the horizontal frame 111, the vertical frame 112, the second frame 120, the track 130, the rotating device 140, the first track trolley assembly 201, the second track trolley assembly 202, the third track trolley assembly 203, the fourth track trolley assembly 204, the first lifting trolley 210, the front axle 211, the rear axle 212, the track wheel 213, the cable 217, the second lifting trolley 220, the first bridge block to be demolished 310, the second bridge block to be demolished 320, the third bridge block to be demolished 330, the fourth bridge block to be demolished 340, the fifth bridge block to be demolished 350, and the sixth bridge block to be demolished 360. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0038] The cable-supported large-span bridge efficient dismantling device provided by the present invention is arranged across the bridge whose lower part is a restricted space, and moves and disassembles the bridge in sequence through the cooperation of a plurality of rail trolleys.

[0039] See also Figure 1 , Figure 2 , which is a schematic structural diagram of the cable-supported large-span bridge efficient demolition device provided by the present invention.

[0040] As can be seen from the figure, the cable-supported large-span bridge efficient dismantling device provided by the present invention includes two components: two sets of assembled support frames 100 and a plurality of rail trolley assemblies 200.

[0041] Among them, two groups of assembled support frames 100 are relatively distributed and arranged across the bridge, and the assembled support frames 100 are provided with tracks 130;

[0042] A plurality of rail trolley assemblies 200 are movably arranged on the rails 130 of the two groups of assembled support frames 100, and the bridge is divided into a plurality of bridge blocks 300 to be dismantled by cutting. Among the plurality of bridge blocks 200 to be dismantled, except for the first and last bridge blocks 300 to be dismantled with piers at the bottom, the remaining bridge blocks 300 to be dismantled correspond to the plurality of rail trolley assemblies 200. The rail trolley assemblies 200 are connected to the bridge blocks 300 to be dismantled by cables 217. The plurality of rail trolley assemblies 200 move on the rails 130 to lift the bridge blocks 200 connected thereto to the nearby abutments in turn and break them up and decompose them.

[0043] Furthermore, if Figure 1 The assembled support frame 100 includes a first frame 110 and a second frame 120. The first frame 110 and the second frame 120 are symmetrically distributed on the left and right sides of the bridge, respectively. A rotating device 140 is provided at the bottom of one end of the first frame 110 and the second frame 120 to be connected to the abutment, and the other ends of the first frame 110 and the second frame 120 are connected in a detachable manner.

[0044] After the bridge is dismantled, the connection between the first frame 110 and the second frame 120 can be disconnected, and then the first frame 110 and the second frame 120 are rotated by the rotating device 140 at the bottom, so that the first frame 110 and the second frame 120 are respectively turned to the abutments on both sides for dismantling and recycling of the frames.

[0045] Compared with the existing technology, this solution can achieve efficient demolition of large-span bridges with limited lower space, eliminating the need to set up multiple lower supports or even use large bridge-building machines and other construction equipment in the traditional large-span bridge demolition process. This can achieve bridge demolition while saving construction costs to a certain extent.

[0046] Specifically, Figure 1 , Figure 2 The first frame 110 and the second frame 120 have the same structure, both of which include a horizontal frame 111 and a vertical frame 112. The horizontal frame 111 is horizontally arranged, and a track 130 is provided on the top thereof, on which the track trolley assembly 200 can be arranged;

[0047] The vertical frame 112 is connected to one end of the horizontal frame 111. A rotating device 140 is provided at the bottom of the vertical frame 112. The rotating device 140 is connected to the abutment. The vertical frame 112 can be rotated by the rotating device 140.

[0048] The cross frame 111 of the first frame 110 and the cross frame 111 of the second frame 120 are butted against each other at the center of the bridge span and are preferably connected by a connecting pin.

[0049] Furthermore, if Figure 1 As shown, in this example, a large span bridge to be demolished is divided into six bridge blocks 300 to be demolished for cutting and separation, namely a first bridge block 310 to be demolished, a second bridge block 320 to be demolished, a third bridge block 330 to be demolished, a fourth bridge block 340 to be demolished, a fifth bridge block 350 to be demolished, and a sixth bridge block 360 to be demolished;

[0050] The first bridge block 310 to be demolished and the sixth bridge block 360 to be demolished are provided with bridge piers at the bottom;

[0051] Corresponding to the second bridge block 320 to be demolished, the third bridge block 330 to be demolished, the fourth bridge block 340 to be demolished, and the fifth bridge block 350 to be demolished, in this example, there are provided a first rail trolley assembly 201, a second rail trolley assembly 202, a third rail trolley assembly 203, and a fourth rail trolley assembly 204;

[0052] Assuming the span of the bridge is L (the distance between the expansion joints at both ends of the bridge), the length of the two blocks on the top of the piers on both sides is recommended to be 0.5m + bearing width + 0.5m, and the length of the remaining blocks is determined according to the design and calculation requirements. Assuming the lengths of each block are L1, L2, L3, L4, L5, L6, (L1+L2+L3+L4+L5+L6=L, and assuming Lmax=Max(L1, L2, L3, L4, L5, L6)); the structural span of the assembled support frame 100 is designed to be Lmax+L+Lmax; the wheelbase of the rail trolley assembly 200 is the length of the segmented block that the trolley needs to lift minus 1m. Taking the wheelbase of the first rail trolley assembly 201 lifting the second bridge block 320 to be dismantled as an example, the wheelbase of the first rail trolley assembly 201 should be adjusted to: L2 car=L2-1.

[0053] In such actual application, a small truck crane is used to install the assembled support frame 100, and the length of the assembled support frame 100 exceeding the expansion joint on each side is controlled to be Lmax; then the rail trolley assembly 200 and the cable 217 are installed, and the position of the lifting trolley and the cable 217 is controlled to be 0.5m away from the position of each partition joint to ensure construction safety.

[0054] In actual application of this example, the first bridge block 310 to be dismantled and the sixth bridge block 360 to be dismantled on the tops of the bridge piers on the left and right sides are first lifted off and then broken and decomposed. Figure 4 As shown, after the crushing and decomposition is completed, the crushed garbage is transported out using excavators and dump trucks.

[0055] The first rail trolley assembly 201 and the fourth rail trolley assembly 204 are responsible for lifting the second bridge block 320 to be demolished and the fifth bridge block 350 to be demolished, respectively lifting the corresponding bridge blocks to be demolished, and driving along the track 130 to the abutment position. The construction steps are as follows: Figure 4 shown.

[0056] The first rail trolley assembly 201 is responsible for lifting the second bridge block 320 to be demolished and the fifth bridge block 350 to be demolished. After the fourth rail trolley assembly 204 reaches the top of the abutment, it slowly lowers the second bridge block 320 to be demolished and the fifth bridge block 350 to the abutment, and then crushes them. After the crushing is completed, an excavator and a dump truck are used to transport the crushed garbage out, and the corresponding lifting trolley is removed at the same time, such as Figure 6 shown.

[0057] Finally, the remaining third bridge block 330 and the fourth bridge block 340 to be demolished are dismantled, lifted off and crushed by the second rail trolley assembly 202 and the third rail trolley assembly 203. If there are more blocks, the same steps can be followed to repeat the dismantling, lifting and crushing of the remaining blocks until all the blocks are dismantled.

[0058] Specifically, Figure 2 , Figure 3 In this solution, the rail trolley assembly 200 is specifically composed of a first lifting trolley 210 and a second lifting trolley 220 having the same structure;

[0059] The first lifting trolley 210 and the second lifting trolley 220 are provided with a front axle 211 and a rear axle 212 at both ends of the bottom, and rail wheels 213 are connected to both ends of the front axle 211 and the rear axle 212. The first lifting trolley 210 and the second lifting trolley 220 are movably arranged on the rails 130 in the two sets of assembled support frames 100 through the rail wheels 213.

[0060] The first lifting trolley 210 and the second lifting trolley 220 are equipped with a control device, a power device and a lifting device, and the first lifting trolley 210 and the second lifting trolley 220 are respectively driven synchronously along the two tracks 130;

[0061] The front axle 211 and the rear axle 212 are respectively connected with cables 217.

[0062] The power unit is connected to the track wheel 213 to provide driving force for the track wheel 213. The lifting device is connected to the front axle 211 and the rear axle 212 respectively, and can drive the front axle 211 and the rear axle 212 to rotate, so that the cable 217 can be lifted and lowered vertically. The cable 217 is used to connect to the bridge block 300 to be demolished. The control device 212 is connected to the power unit 213 and the lifting device 214 respectively, and is used to control the power unit 213 and the lifting device 214.

[0063] Based on the cable-supported large-span bridge efficient demolition device formed by the above scheme, this scheme also provides a construction method, and the construction steps are as follows:

[0064] S1: Determine the span of the bridge to be demolished, the length and position of each bridge block 300 to be demolished, the weight of each bridge block 300 to be demolished, the construction period, etc. according to the design drawings. According to the above factors and the calculation of the structural bearing capacity, determine the structural span, rod type, assembly form, number of each bridge block 300 to be demolished, number of rail trolley assemblies 200, wheelbase of each rail trolley assembly 200, lifting power tonnage, driving power tonnage and other parameters of the assembled support frame 100;

[0065] S2: Use a small truck crane to install the assembled support frame 100, use a boom truck to install the rail trolley assembly 200 and the cable 215, and the lifting cable 215 passes around the bottom of the bridge block 300 to be demolished, and the two ends are fixed on the front and rear axles of the lifting trolley respectively. After the above work is completed, the bridge is cut according to the design requirements and position using a diamond wire saw according to the designed split seam position (such as Figure 1 The figure shows the design position of the separation seam and the relative position of each device);

[0066] S3: Use a truck crane to lift the two bridge blocks 300 to be dismantled from the tops of the bridge piers on the left and right sides at the abutment or roadbed, and then crush and decompose them. Figure 4 As shown in the figure, after the crushing and decomposition is completed, the crushed garbage is transported out using an excavator and a dump truck;

[0067] S4: The two rail trolley assemblies 200 located on the outside respectively lift the corresponding bridge blocks 300 to be dismantled and drive along the rails 130 to the abutments on both sides. During the process, the lifting device rotates the front and rear axles of the lifting trolley at the same time to lift the split bridge blocks 300 to be dismantled upwards. The lifting height is guaranteed not to touch the abutment (generally 20 cm higher than the abutment). The construction steps are as follows: Figure 5 As shown;

[0068] S5: After the two outer rail trolley assemblies 200 reach the top of the abutment, they slowly lower the bridge block 300 to the abutment and then crush it. After the crushing is completed, the crushed garbage is transported out using an excavator and a dump truck, and the corresponding rail trolley assemblies 200 are removed at the same time. Figure 6 As shown;

[0069] S6: Repeat the above S4-S5 until the remaining bridge blocks 300 to be dismantled are dismantled, lifted away, and crushed;

[0070] S7: disconnecting the cross frame 111 of the first frame 110 from the cross frame 111 of the second frame 120, and then rotating the rotating device 140 at one end of the first frame 110 and the second frame 120 to turn the first frame 110 and the second frame 120 to the shore for dismantling and recycling.

[0071] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A cable-supported long-span bridge efficient demolition device, characterized in that: It comprises two groups of assembled support frames and several track trolley assemblies. The two groups of assembled support frames are relatively distributed and arranged across the bridge. The assembled support frames are provided with tracks. The several track trolley assemblies are respectively and movably arranged on the tracks of the two groups of assembled support frames. The bridge is divided into several to-be-removed bridge blocks by cutting. Among the several to-be-removed bridge blocks, except for the first and last two to-be-removed bridge blocks with piers at the bottom, the other to-be-removed bridge blocks correspond to the several track trolley assemblies. The track trolley assemblies are connected to the to-be-removed bridge blocks by cables. The several track trolley assemblies move on the tracks to lift the bridge blocks connected thereto to the nearby abutments in turn and break them up and decompose them. The assembled support frame includes a first frame and a second frame. The first frame and the second frame are symmetrically distributed on the left and right sides of the bridge respectively. The bottom of one end of the first frame and the second frame is respectively provided with a rotating device connected to the abutment, and the other end of the first frame and the second frame are connected in a detachable manner.

2. The cable-supported large-span bridge efficient demolition device according to claim 1 is characterized in that: The first frame and the second frame have the same structure, both comprising a horizontal frame and a vertical frame. The horizontal frame is arranged horizontally, and a track is arranged on the top thereof, on which the track trolley assembly can be arranged; The vertical frame is connected to one end of the horizontal frame, and a rotating device is provided at the bottom of the vertical frame. The rotating device is connected to the abutment, and the vertical frame can be rotated by the rotating device; The cross frame of the first frame body is butted against the cross frame of the second frame body at the center of the bridge span and connected via a connecting pin.

3. The cable-supported large-span bridge efficient demolition device according to claim 1 is characterized in that: The rail trolley assembly is composed of a first lifting trolley and a second lifting trolley with the same structure; The first lifting trolley and the second lifting trolley are provided with a front axle and a rear axle at both ends of the bottom, respectively, and rail wheels are connected to both ends of the front axle and the rear axle. The first lifting trolley and the second lifting trolley are movably arranged on the rails in the two sets of assembled support frames through the rail wheels. The first lifting trolley and the second lifting trolley are equipped with a control device, a power device and a lifting device, and the first lifting trolley and the second lifting trolley respectively realize synchronous travel along two tracks; The front axle and the rear axle are respectively connected with cables. The power unit is connected to the track wheel to provide driving force for the track wheel. The lifting device is connected to the front axle and the rear axle respectively, and can drive the front axle and the rear axle to rotate, so that the cable can be lifted and lowered vertically. The cable is used to connect to the bridge block to be demolished. The control device is connected to the power unit and the lifting device respectively, and is used to control the power unit and the lifting device.

4. A construction method for a cable-supported large-span bridge efficient demolition device, characterized in that: include: S1: Determine the span of the bridge to be dismantled, the length and position of each bridge block to be dismantled, the weight of each bridge block to be dismantled, the construction period, etc. according to the design drawings. According to the above factors and the calculation of the structural bearing capacity, determine the structural span, rod type, assembly form, number of bridge blocks to be dismantled, number of rail trolley assemblies, wheelbase of each rail trolley assembly, lifting power tonnage, driving power tonnage and other parameters of the assembled support frame; S2: Use a small truck crane to install the assembled support frame, use a boom truck to install the rail trolley assembly and cables, and fix the two ends of the lifting cable on the front and rear axles of the lifting trolley after passing it around the bottom of the bridge block to be demolished. After the above work is completed, use a diamond wire saw to cut the bridge according to the designed split seam position according to the design requirements and position; S3: Using a truck crane at the abutment or roadbed, two bridge blocks 300 to be dismantled on the tops of the left and right bridge piers are lifted off and crushed. After the crushing and decomposition is completed, an excavator and a dump truck are used to transport the crushed garbage out; S4: The two rail trolley assemblies located on the outside respectively lift the corresponding bridge blocks to be dismantled and drive along the rails to the abutments on both sides. During the process, the lifting device rotates the front and rear axles of the lifting trolley at the same time to lift the segmented bridge blocks to be dismantled upwards, and the lifting height is ensured not to touch the abutments; S5: After the two rail trolley assemblies on the outside reach the top of the abutment, they slowly lower the bridge blocks to be dismantled to the abutment and then crush them. After the crushing is completed, the crushed garbage is transported out using an excavator and a dump truck, and the corresponding rail trolley assemblies are removed at the same time; S6: Repeat the above S4-S5 until the remaining bridge blocks to be demolished are dismantled, lifted away, and crushed; S7: disconnecting the cross frame of the first frame from the cross frame of the second frame, and then rotating the rotating devices at one end of the first frame and the second frame to turn the first frame and the second frame to the shore for dismantling and recycling.

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