A high-efficiency dismantling device for a long-span bridge in a tray carrying mode and a construction method thereof

Abstract

The application discloses a tray-bearing type large-span bridge high-efficiency dismantling device and a construction method, which comprises two sets of assembled support frames, a dismantling section lifting trolley assembly and a to-be-dismantled section lifting trolley assembly. The two sets of assembled support frames are oppositely arranged and cross the bridge. The assembled support frames are provided with rails. The dismantling section lifting trolley assembly and the to-be-dismantled section lifting trolley assembly are movably arranged on the rails of the two sets of assembled support frames. The dismantling section lifting trolley assembly and the to-be-dismantled section lifting trolley assembly are connected with lifting ropes, and the lifting ropes are connected with trays. The bridge is divided into a plurality of to-be-dismantled bridge blocks. The first and last to-be-dismantled bridge blocks of the plurality of to-be-dismantled bridge blocks are provided with piers at the bottom. The first to-be-dismantled bridge block is cut from the whole bridge, and the first to-be-dismantled bridge block is lifted away by a crane. At this time, the dismantling section lifting trolley assembly is located above the to-be-dismantled bridge block adjacent to the first to-be-dismantled bridge block, and the to-be-dismantled section lifting trolley assembly lifts and holds the remaining to-be-dismantled bridge blocks through the trays.

Description

Technical Field

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

[0002] The bridge engineering community has accumulated considerable experience in bridge demolition design theory, construction methods, and techniques. In recent years, with the research, development, and utilization of static cutting, crushing, jacking, and hoisting technologies, a number of new construction techniques for bridge demolition have emerged. However, the equipment and construction techniques for demolishing bridges in confined spaces (i.e., bridges with inaccessible lower sections, such as those spanning high canyons, where lower rivers cannot be supported due to navigation or flood control, or where lower river management authorities do not permit temporary supports) remain unclear. Furthermore, while modified bridge erection machines can be used for such bridge demolition, their installation and retrieval costs are high, and their efficiency is low. Summary of the Invention

[0003] In view of the above-mentioned technical problems in the demolition of existing bridges with limited lower space, the purpose of the present invention is to provide a pallet-supported large-span bridge efficient demolition device and construction method. This solution can achieve efficient demolition of large-span bridges with limited lower space, eliminating the need for the traditional large-span bridge demolition process to set up multiple lower supports, and even the use of large bridge-building machines and other construction equipment, 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 pallet-supported large-span bridge efficient demolition device, comprising two sets of assembled support frames, a demolition section lifting trolley assembly, and a to-be-dismantled section lifting trolley assembly.

[0005] The two groups of assembled support frames are relatively distributed and arranged across the bridge. The assembled support frames are provided with tracks. The dismantling section lifting trolley assembly and the to-be-dismantled section lifting trolley assembly are movably arranged on the tracks of the two groups of assembled support frames. The dismantling section lifting trolley assembly and the to-be-dismantled section lifting trolley assembly are connected with a lifting rope, and the lifting rope is connected with a pallet.

[0006] The bridge is divided into a number of to-be-demolished bridge blocks according to the span, and the bottoms of the first and last bridge blocks are provided with bridge piers. The first bridge block to be demolished is cut from the entire bridge, and the first bridge block to be demolished is lifted away by a crane and then crushed and decomposed. At this time, the demolition section pulling trolley assembly is located above the adjacent bridge blocks to be demolished at the first bridge block to be demolished, and the demolition section pulling trolley assembly lifts the remaining bridge blocks to be demolished through the pallet to ensure the stability of the uncut and separated bridge blocks to be demolished;

[0007] The demolition section lifting trolley assembly lifts the bridge block to be demolished below it through the pallet, and cuts the bridge block to be demolished from the entire bridge. The demolition section lifting trolley assembly transports the bridge block to the abutment and breaks it down.

[0008] The demolition section lifting trolley assembly cooperates with the to-be-demolished section lifting trolley assembly. By moving on the track, the demolition section lifting trolley assembly moves all the to-be-demolished bridge blocks except the tail bridge block and the adjacent to-be-demolished bridge blocks to the abutment and crushes them.

[0009] The lifting trolley assembly of the section to be demolished moves on the track and supports the remaining bridge blocks to be demolished until the lifting trolley assembly of the section to be demolished finally lifts the bridge block to be demolished adjacent to the rear bridge block to be demolished and cuts the bridge block to be demolished apart from the rear bridge block to be demolished. The lifting trolley assembly of the section to be demolished moves the lifted bridge block to be demolished to the abutment and crushes it, and finally the rear bridge block to be demolished is lifted away by a crane and crushed, thereby completing the demolition of the entire bridge.

[0010] Furthermore, 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 are respectively provided with a rotating device connected to the abutment, and the other ends of the first frame and the second frame are connected in a detachable manner.

[0011] Furthermore, the first frame and the second frame have the same structure, both comprising a horizontal frame and a vertical frame, the horizontal frame being arranged horizontally, and having a track on the top thereof for the rail trolley assembly to be arranged thereon;

[0012] 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;

[0013] The cross frame of the first frame body and the cross frame of the second frame body are butted against each other at the center of the bridge span and connected via a connecting pin.

[0014] Furthermore, the lifting trolley assembly for the dismantling section and the lifting trolley assembly for the section to be dismantled have the same structure, and are both composed of a first lifting trolley and a second lifting trolley with the same structure;

[0015] The first lifting trolley and the second lifting trolley are respectively provided with a front axle and a rear axle at both ends of the bottom, 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.

[0016] 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 movement along two tracks;

[0017] The front shaft and the rear shaft are connected with the lifting ropes respectively, and the lifting ropes on the front shaft and the rear shaft in the first lifting trolley are connected with the four corner portions of the tray respectively, and the lifting ropes on the front shaft and the rear shaft in the second lifting trolley are connected with the four corner portions of the tray respectively;

[0018] The power device is connected with the track wheels and is used for providing driving force for the track wheels, the lifting device is connected with the front shaft and the rear shaft respectively and can drive the front shaft and the rear shaft to rotate, so that the lifting ropes are lifted vertically, the tray is used for supporting the bottom of the to-be-removed bridge block, and the lifting ropes are used for being connected with the to-be-removed bridge block, and the control device is connected with the power device and the lifting device respectively and is used for controlling the power device and the lifting device.

[0019] Further, the tray is composed of four fluorine plates and steel plates which are arranged in an overlapping manner, and the four fluorine plates are respectively provided with connecting portions at four corner portions of the top of the four fluorine plates, so as to be connected with the lifting ropes.

[0020] In order to achieve the above purpose, the construction method of the tray bearing type large-span bridge efficient dismantling device provided by the present application is used for any one of the above, and the construction method comprises the following steps:

[0021] S1: according to the design drawing, the span of the to-be-removed bridge is determined, the length and position of each to-be-removed bridge block, the weight of each to-be-removed bridge block, the construction period and the like are considered comprehensively, and the structural span of the assembled support frame, the type of the rod, the assembly form, the number of each to-be-removed bridge block, the size of the tray, the wheelbase of each first lifting trolley and second lifting trolley, the lifting power tonnage, the driving power tonnage and the like are determined according to the above factors and the structural bearing capacity calculation;

[0022] S2: the assembled support frame and the track are installed by using a small car crane, the track dismantling section lifting trolley assembly is installed by using a boom truck, the to-be-removed section lifting trolley assembly is connected with the lifting ropes, the lifting ropes are wound around the front shaft and the rear shaft fixed on the lifting trolley respectively, the dismantling section lifting trolley assembly is moved to the top of the to-be-removed bridge block adjacent to the first to-be-removed bridge block, and the to-be-removed section lifting trolley assembly is installed with the tray to support the remaining to-be-removed bridge;

[0023] S3: according to the design requirement and the position, the first to-be-removed bridge block and the whole bridge are cut by using a diamond rope saw, the to-be-removed bridge block is broken and decomposed at the abutment or roadbed position by using a car crane, the broken and decomposed garbage is transported out by using an excavator and a dump truck, the tray is connected to the dismantling section lifting trolley assembly by using a car crane and a boom truck with manual assistance, and the tray reaches the position below the to-be-removed bridge block adjacent to the first to-be-removed bridge block by moving the dismantling section lifting trolley assembly;

[0024] S4: Separate the adjacent bridge blocks to be demolished from the beam segments to be demolished using a diamond wire saw, and use the demolition section lifting trolley assembly to lift the bridge block to be demolished. When the demolition section lifting trolley assembly moves along the track toward the abutment, the lifting device in the demolition section lifting trolley assembly drives the front and rear axles to rotate simultaneously to lift the separated beam upwards, ensuring that the lifting height does not touch the abutment.

[0025] S5: After the demolition section lifting trolley assembly reaches the top of the abutment, the bridge blocks to be demolished are slowly lowered to the abutment and then crushed. After the crushing is completed, the crushed waste is transported out using an excavator and a dump truck;

[0026] S6: The demolition section lifting trolley assembly returns along the track, and at the same time, the lifting rope is lowered. The tray of the demolition section lifting trolley assembly slides along the adjacent bridge block to be demolished that has just been demolished and is hoisted. At the same time, the demolition section lifting trolley assembly also slides along the bridge block to be demolished.

[0027] S7: The bridge block to be demolished, which is held by the demolition section lifting trolley assembly, is separated from the bridge block to be demolished by using a diamond wire saw. The demolition section lifting trolley assembly lifts the bridge block to the abutment and crushes it;

[0028] S8: The remaining bridge blocks to be demolished are dismantled, lifted, and crushed and decomposed in a loop according to the steps of S6-S7, until the demolition section lifting trolley assembly moves all the bridge blocks to be demolished except the rear bridge block to be demolished and the bridge blocks to be demolished adjacent to the rear bridge block to be demolished to the abutment and crushes and decomposes them, the demolition section pulling trolley assembly lifts the bridge block to be demolished adjacent to the rear bridge block to be demolished and cuts and separates the bridge block to be demolished from the rear bridge block to be demolished, and the demolition section pulling trolley assembly moves the lifted bridge block to be demolished to the abutment and crushes and decomposes it;

[0029] S9: Finally, a car crane is used at the abutment to lift the bridge block to be demolished and crush it. After the crushing is completed, an excavator and a dump truck are used to transport the crushed garbage out. At this time, the entire bridge is demolished;

[0030] S10: 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.

[0031] The present invention provides a pallet-supported large-span bridge efficient demolition device and construction method. This solution can achieve efficient demolition of large-span bridges with limited lower space, eliminating the need for setting up multiple lower supports or even using 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.

[0032] Compared with the prior art, the cable-supported long-span bridge efficient demolition device and construction method provided by the present invention have the following beneficial effects:

[0033] This construction equipment and method 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 during the traditional large-span bridge demolition process. This can achieve bridge demolition while saving construction costs to a certain extent.

[0034] (2) The construction equipment and construction method can ensure the safety and environmental protection of the entire demolition process. 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;

[0035] (3) The bridge demolition device only needs to use two lifting trolleys and a load tray. The load tray has a two-layer structure, with the top surface layer being a PTFE plate and the bottom being made of steel. The tray can reduce the sliding friction at the bottom of the beam while providing sufficient load-bearing capacity for the beam section to be demolished. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0037] Figure 1 This is a schematic diagram of the actual application of the tray-supported long-span bridge efficient demolition device provided by the present invention;

[0038] Figure 2 A side view of the tray-supported, long-span bridge efficient demolition device provided by the present invention;

[0039] Figure 3 A side view of a lifting trolley assembly for the demolition section of a pallet-supported, long-span bridge high-efficiency demolition device provided by the present invention;

[0040] Figure 4 A schematic diagram of the structure of the pallet in the pallet-supported long-span bridge efficient demolition device provided by the present invention;

[0041] Figure 5 A schematic diagram of step 3 in the construction method of the tray-supported long-span bridge efficient demolition device provided by the present invention;

[0042] Figure 6 A schematic diagram of step 4 in the construction method of the tray-supported long-span bridge efficient demolition device provided by the present invention;

[0043] Figure 7 A schematic diagram of step 5 in the construction method of the tray-supported long-span bridge efficient demolition device provided by the present invention;

[0044] Figure 8A schematic diagram of step 6 in the construction method of the tray-supported long-span bridge efficient demolition device provided by the present invention;

[0045] Figure 9 A schematic diagram of step 7 in the construction method of the tray-supported long-span bridge efficient demolition device provided by the present invention;

[0046] Illustration:

[0047] Assembled support frame 100, demolished section lifting trolley assembly 200, to-be-dismantled section lifting trolley assembly 300, to-be-dismantled bridge block 400;

[0048] 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 lifting trolley 210, the front axle 211, the rear axle 212, the track wheel 213, the lifting rope 217, the pallet 218, the Teflon plate 218a, the steel plate 218b, the connecting part 218c, the second lifting trolley 220, the first bridge block to be demolished 410, the second bridge block to be demolished 420, the third bridge block to be demolished 430, the fourth bridge block to be demolished 440, the fifth bridge block to be demolished 450, and the sixth bridge block to be demolished 460. DETAILED DESCRIPTION

[0049] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0050] The tray-supported large-span bridge efficient demolition device provided by the present invention is installed across the bridge and can demolish the bridge without providing support at the bottom of the bridge. It is well suitable for demolishing bridges with limited lower space.

[0051] See also Figures 1-2 , which shows a structural schematic diagram of the pallet-supported large-span bridge efficient demolition device provided by the present invention.

[0052] As can be seen from the drawings, the pallet-supported large-span bridge efficient demolition device provided by the present invention includes three components: two sets of assembled support frames 100, a demolition section lifting trolley assembly 200, and a to-be-demolished section lifting trolley assembly 300.

[0053] The two sets of assembled support frames 100 are relatively distributed and arranged across the bridge, and the assembled support frames 100 are provided with tracks 130;

[0054] The dismantling section lifting trolley assembly 200 and the to-be-dismantled section lifting trolley assembly 300 are movably arranged on the tracks 130 of the two sets of assembled support frames 100. The dismantling section lifting trolley assembly 200 and the to-be-dismantled section lifting trolley assembly 300 are connected with a lifting rope 217, and the lifting rope 217 is connected with a tray 218.

[0055] The bridge is divided into a number of to-be-demolished bridge blocks 400 according to the span. The first and last bridge blocks 400 of the to-be-demolished bridge blocks 400 are provided with piers at the bottom. The first bridge block 400 is cut from the entire bridge and lifted away by a crane, and then crushed and decomposed. At this time, the demolition section lifting trolley assembly 200 is located above the adjacent bridge blocks 400 of the first bridge block 400. The demolition section lifting trolley assembly 300 lifts the remaining bridge blocks 400 through the pallet 218 to ensure the stability of the uncut and separated bridge blocks.

[0056] The demolition section lifting trolley assembly 200 lifts the bridge block 400 to be demolished below it through the pallet 218, and cuts the bridge block 400 to be demolished from the entire bridge. The demolition section lifting trolley assembly 200 transports the bridge block 400 to the abutment and crushes and decomposes it.

[0057] The demolition section lifting trolley assembly 200 cooperates with the to-be-demolished section lifting trolley assembly 300. By moving on the track 130, the demolition section lifting trolley assembly 200 sequentially moves all the to-be-demolished bridge blocks 400 except the rear to-be-demolished bridge block 400 and the to-be-demolished bridge blocks 400 adjacent to the rear to-be-demolished bridge block 400 to the abutment and crushes and decomposes them.

[0058] The trolley assembly 300 for lifting the section to be demolished moves on the track 130 and supports the remaining bridge block 400 to be demolished until the trolley assembly 300 for lifting the section to be demolished lifts the bridge block 400 to be demolished adjacent to the rear bridge block 400 to be demolished. The trolley assembly 300 for lifting the section to be demolished cuts and separates the bridge block 400 to be demolished from the rear bridge block 400 to be demolished and moves it to the abutment and crushes it. Finally, the rear bridge block 400 to be demolished is lifted away by a crane and crushed and decomposed, thereby completing the demolition of the entire bridge.

[0059] 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. The other ends of the first frame 110 and the second frame 120 are connected in a detachable manner.

[0060] After the bridge is dismantled, the assembled support frame 100 of the above structure can disconnect the connection between the first frame 110 and the second frame 120, and then the first frame 110 and the second frame 120 are rotated through 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.

[0061] Compared with existing technologies, 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.

[0062] Specifically, such as Figure 1 , Figure 2 The first frame 110 and the second frame 120 have the same structure and both include a horizontal frame 111 and a vertical frame 112. The horizontal frame 111 is horizontally arranged and has a track 130 on its top for the removal of the section lifting trolley assembly 200, on which the section to be removed lifting trolley assembly 300 is arranged;

[0063] 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.

[0064] The cross frame 111 of the first frame 110 and the cross frame 111 of the second frame 120 are docked at the center of the bridge span and are preferably connected by a connecting pin.

[0065] Furthermore, if Figure 1 As shown, in this example, a large span bridge to be demolished is divided into six bridge blocks 400 to be demolished for cutting and separation, namely a first bridge block 410 to be demolished, a second bridge block 420 to be demolished, a third bridge block 430 to be demolished, a fourth bridge block 440 to be demolished, a fifth bridge block 450 to be demolished, and a sixth bridge block 460 to be demolished;

[0066] The first bridge block 410 to be demolished and the sixth bridge block 460 to be demolished are provided with bridge piers at the bottom;

[0067] Assuming the bridge span is L (the distance between the expansion joints at both ends of the bridge), the recommended length of the two blocks at the top of the piers on both sides is 0.5m + the support width + 0.5m. The lengths of the remaining blocks are determined based on design and calculation requirements. Assume the lengths of each block are L1, L2, L3, L4, L5, and L6, respectively (L1 + L2 + L3 + L4 + L5 + L6 = L, and assume Lmax = Max(L1, L2, L3, L4, L5, L6)). The structural span of the prefabricated support frame 100 is designed to be Lmax + L + Lmax. The wheelbase of the demolition section lifting trolley assembly 200 is the length of the segment it is lifting minus 1m. Taking the wheelbase of the second bridge segment 420 to be demolished as an example, the wheelbase of the first rail trolley assembly 201 should be adjusted to: L2 = L2 - 1.

[0068] In such practical application, a small truck crane is used to install the assembled support frame 100.

[0069] The length of the support frame 100 extending beyond the expansion joint on each side is controlled to be Lmax; then the dismantling section lifting trolley assembly 200, the lifting trolley assembly 300 of the section to be dismantled and the lifting rope 217 are installed, and the dismantling section lifting trolley assembly 200 is only installed with the lifting rope 217 and the pallet 218 is not installed for the time being; the four corners of the pallet 218 of the lifting trolley assembly 300 of the section to be dismantled are respectively fixed to the front and rear axles of the lifting trolley assembly 300 of the section to be dismantled through the two ends of the lifting rope 217, and the position of the lifting trolley assembly 300 of the section to be dismantled and the lifting rope 217 is controlled to be 0.5m away from the position of the separation joint to ensure construction safety.

[0070] In actual application of this example, the demolition section lifting trolley assembly 200 is located above the second bridge block to be demolished 420, and the demolition section lifting trolley assembly 300 uses a pallet to lift the third bridge block to be demolished 430, and then the first bridge block to be demolished 410 on the top of the left pier is cut off from the entire bridge, and the first bridge block to be demolished 410 is lifted away by a crane and then crushed and decomposed;

[0071] The third bridge block 430 to be demolished is hoisted by the lifting trolley assembly 300 to stabilize the remaining bridge. At this time, the second bridge block 420 to be demolished below it is lifted off to the abutment by the lifting trolley assembly 200 via the pallet 218 and broken into pieces.

[0072] Then, the demolition section lifting trolley assembly 200 and the to-be-demolished section lifting trolley assembly 300 move toward the sixth to-be-demolished bridge block 460 , the demolition section lifting trolley assembly 200 hoists the third to-be-demolished bridge block 430 , and the to-be-demolished section lifting trolley assembly 300 hoists the fourth to-be-demolished bridge block 440 ;

[0073] The third bridge block 430 to be demolished is cut from the entire bridge, and the demolition section lifting trolley assembly 200 lifts the third bridge block 430 to be demolished to the abutment and crushes and decomposes it. Similarly, the demolition section lifting trolley assembly 200 lifts the fourth bridge block 440 to be demolished to the abutment and crushes and decomposes it;

[0074] Finally, the section-to-be-demolished lifting trolley assembly 300 lifts the fifth bridge block 450 to be demolished, cuts and separates the fifth bridge block 350 from the sixth bridge block 460 to be demolished, and the section-to-be-demolished lifting trolley assembly 300 lifts the fifth bridge block 450 to be demolished to the abutment for crushing and decomposing it. Finally, the sixth bridge block 460 to be demolished with piers at the bottom is lifted and crushed and decomposed by a crane, thereby completing the overall demolition of the bridge.

[0075] Specifically, such as Figure 2 , Figure 3 In this solution, the dismantling section lifting trolley assembly 200 and the to-be-dismantled section lifting trolley assembly 300 have the same structure, and are both composed of a first lifting trolley 210 and a second lifting trolley 220 of the same structure;

[0076] 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 the front axle 211 and the rear axle 212 are connected to the ends of the rail wheels 213. 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.

[0077] The first lifting trolley 210 and the second lifting trolley 220 are equipped with a control device, a power device and a lifting device. The first lifting trolley 210 and the second lifting trolley 220 respectively realize synchronous travel along the two tracks 130;

[0078] The front axle 211 and the rear axle 212 are connected to a lifting rope 217 respectively. The lifting ropes 217 on the front axle 211 and the rear axle 212 of the first lifting trolley 210 and the lifting ropes 217 on the front axle 211 and the rear axle 212 of the second lifting trolley 220 are connected to the four corners of the tray 218 respectively.

[0079] 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 lifting rope 217 can be lifted and lowered vertically. The tray 218 is used to support the bottom of the bridge block 400 to be demolished. The control device is connected to the power unit and the lifting device respectively to control the power unit and the lifting device.

[0080] The above-mentioned lifting rope 217 is preferably a steel wire rope in this solution;

[0081] like Figure 4 The tray 218 is composed of overlapping PTFE plates 218a and steel plates 218b. The four corners of the top of the PTFE plate 218a are respectively provided with connecting parts 218c for connecting with the lifting rope 217. The tray 218 with such a structure can reduce the sliding friction at the bottom of the beam while providing sufficient bearing capacity for the beam section to be dismantled.

[0082] Based on the above scheme, the pallet-supported long-span bridge efficient demolition device is constructed. This scheme also provides a construction method. The construction steps are as follows:

[0083] S1: Determine the span of the bridge to be demolished, the length and position of each bridge block 400 to be demolished, the weight of each bridge block 400 to be demolished, the construction period, etc., according to the design drawings. Based on the above factors and the calculation of the structural bearing capacity, determine the structural span of the assembled support frame 100, the type of rods, the assembly form, the number of bridge blocks 400 to be demolished, the size of the pallet 218, the wheelbase of each first lifting trolley 210 and the second lifting trolley 220, the lifting power tonnage, the driving power tonnage, and other parameters;

[0084] S2: Use a small truck crane to install the assembled support frame 100 and the track 130, and use a boom truck to install the track demolition section lifting trolley assembly 200, the section to be demolished lifting trolley assembly 300 and the lifting rope 217. The lifting rope 217 is passed around and fixed on the front and rear axles of the lifting trolley respectively. The demolition section lifting trolley assembly 200 is moved to the top of the bridge block 400 adjacent to the bridge block 400 to be demolished at the head. The section to be demolished lifting trolley assembly 300 is installed with a tray 218 to support the remaining bridge to be demolished, such as Figure 1 ;

[0085] S3: According to the design requirements and positions, the diamond wire saw is used to cut the first bridge block 400 to be demolished and the bridge as a whole, and the bridge block 400 to be demolished is crushed and decomposed at the abutment or roadbed position by a car crane. After the crushing and decomposition is completed, the crushed garbage is transported out by an excavator and a dump truck, and the car crane and the boom truck are used for manual assistance to connect the pallet 218 to the demolition section lifting trolley assembly 200, and the demolition section lifting trolley assembly 200 is moved so that the pallet 218 reaches the bottom of the bridge block 400 to be demolished adjacent to the first bridge block 400 to be demolished. Figure 5 shown.

[0086] S4: The bridge blocks 400 to be demolished adjacent to the first bridge block 400 to be demolished are separated from the beam section to be demolished by using a diamond wire saw, and the demolishing section lifting trolley assembly 200 lifts the bridge block 400 to be demolished. When the demolishing section lifting trolley assembly 200 moves along the track 130 to the abutment position, the pulling device 214 in the demolishing section lifting trolley assembly 200 drives the front axle 211 and the rear axle 212 to rotate simultaneously to lift the split beam upwards, and the lifting height is guaranteed not to touch the abutment (generally 20 cm higher than the abutment). The construction steps are as follows: Figure 6 As shown;

[0087] S5: After the demolition section lifting trolley assembly 200 reaches the top of the abutment, the bridge block 400 to be demolished is slowly lowered to the abutment and then crushed. After the crushing is completed, the crushed garbage is transported out using an excavator and a dump truck. Figure 7 As shown;

[0088] S6: The lifting trolley assembly 200 of the dismantling section returns along the track 130, and the lifting rope 217 is lowered. Figure 5 As shown, the tray 218 of the demolition section lifting trolley assembly 200 slides along and hangs the adjacent bridge block 400 to be demolished of the bridge block 400 to be demolished just now, and at the same time, the demolition section pulling trolley assembly 300 also slides along the bridge block 400 to be demolished, as shown in FIG. Figure 8 shown.

[0089] S7: the bridge block 400 to be dismantled hoisted by the dismantling section hoisting trolley assembly 200 is separated from the bridge to be dismantled by using a diamond rope rope saw, and the dismantling section hoisting trolley assembly 200 hoists the bridge block 400 to be dismantled to the abutment and breaks and disintegrates, like Figure 9 ;

[0090] S8: the dismantling, hoisting away and breaking and disintegrating of the remaining bridge blocks 400 to be dismantled are carried out in cycles according to the steps of S6-S7, until the dismantling section hoisting trolley assembly 200 moves all the bridge blocks 400 to be dismantled except the tail bridge block 400 to be dismantled and the bridge block 400 to be dismantled adjacent to the tail bridge block 400 to be dismantled to the abutment and breaks and disintegrates, the dismantling section hoisting trolley assembly 300 hoists the bridge block 400 to be dismantled adjacent to the tail bridge block 400 to be dismantled and cuts and separates the bridge block 400 to be dismantled from the tail bridge block 400 to be dismantled, and the dismantling section hoisting trolley assembly 300 moves the bridge block 400 to be dismantled hoisted thereby to the abutment and breaks and disintegrates;

[0091] S9: finally, the tail bridge block 400 to be dismantled is hoisted away by using a car hoist at the abutment position and broken, and the broken garbage is transported out by using an excavator and a dump truck after the breaking is completed, at this time, the dismantling of the whole bridge is completed;

[0092] S10: the connection of the cross frame 111 of the first frame body 110 and the cross frame 111 of the second frame body 120 is disconnected, then the rotating device 140 at one end of the first frame body 110 and the second frame body 120 is rotated, so that the first frame body 110 and the second frame body 120 are turned to the shore side, and are dismantled and recycled.

[0093] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principle of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A pallet-supported, high-efficiency demolition device for large-span bridges, characterized in that: It includes two sets of assembled support frames, the lifting trolley assembly for the dismantled section and the lifting trolley assembly for the section to be dismantled. The two groups of assembled support frames are relatively distributed and arranged across the bridge. The assembled support frames are provided with tracks. The dismantling section lifting trolley assembly and the to-be-dismantled section lifting trolley assembly are movably arranged on the tracks of the two groups of assembled support frames. The dismantling section lifting trolley assembly and the to-be-dismantled section lifting trolley assembly are connected with a lifting rope, and the lifting rope is connected with a pallet. The bridge is divided into a number of to-be-demolished bridge blocks according to the span, and the bottoms of the first and last bridge blocks are provided with bridge piers. The first bridge block to be demolished is cut from the entire bridge, and the first bridge block to be demolished is lifted away by a crane and then crushed and decomposed. At this time, the demolition section pulling trolley assembly is located above the adjacent bridge blocks to be demolished at the first bridge block to be demolished, and the demolition section pulling trolley assembly lifts the remaining bridge blocks to be demolished through the pallet to ensure the stability of the uncut and separated bridge blocks to be demolished; The demolition section lifting trolley assembly lifts the bridge block to be demolished below it through the pallet, and cuts the bridge block to be demolished from the entire bridge. The demolition section lifting trolley assembly transports the bridge block to the abutment and breaks it down. The demolition section lifting trolley assembly cooperates with the to-be-demolished section lifting trolley assembly. By moving on the track, the demolition section lifting trolley assembly moves all the to-be-demolished bridge blocks except the tail bridge block and the adjacent to-be-demolished bridge blocks to the abutment and crushes them. The lifting trolley assembly of the section to be demolished moves on the track and supports the remaining bridge blocks to be demolished until the lifting trolley assembly of the section to be demolished lifts the bridge block to be demolished adjacent to the rear bridge block to be demolished and cuts the bridge block to be demolished apart from the rear bridge block to be demolished. The lifting trolley assembly of the section to be demolished moves the lifted bridge block to be demolished to the abutment and crushes it. Finally, the rear bridge block to be demolished is lifted away by a crane and crushed and decomposed, thereby completing the demolition of the entire bridge.

2. The tray-supported long-span bridge efficient demolition device according to claim 1 is characterized in that: 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 are respectively provided with a rotating device connected to the abutment, and the other ends of the first frame and the second frame are connected in a detachable manner.

3. The tray-supported long-span bridge efficient demolition device according to claim 2 is characterized in that: The first frame and the second frame have the same structure and both include a horizontal frame and a vertical frame. The horizontal frame is arranged horizontally and has a track on the top for the track trolley assembly to be arranged thereon. 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 and the cross frame of the second frame body are butted against each other at the center of the bridge span and connected via a connecting pin.

4. The tray-supported long-span bridge efficient demolition device according to claim 3 is characterized in that: The demolishing section lifting trolley assembly and the to-be-disassembled section lifting trolley assembly have the same structure, and are both composed of a first lifting trolley and a second lifting trolley of the same structure; The first lifting trolley and the second lifting trolley are respectively provided with a front axle and a rear axle at both ends of the bottom, 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 movement along two tracks; The front axle and the rear axle are respectively connected with a lifting rope, and the lifting ropes on the front axle and the rear axle of the first lifting trolley and the lifting ropes on the front axle and the rear axle of the second lifting trolley are respectively connected to the four corners of the pallet; 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 lifting rope can be lifted and lowered vertically. The tray is used to support the bottom of 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.

5. The tray-supported long-span bridge efficient demolition device according to claim 4 is characterized in that: The tray is composed of overlapping polytetrafluoroethylene plates and steel plates. The four corners of the top of the polytetrafluoroethylene plates are respectively provided with connecting parts for connecting with the hanging ropes.

6. A construction method for a pallet-supported, high-efficiency demolition device for a large-span bridge, wherein the construction method uses the pallet-supported, high-efficiency demolition device for a large-span bridge according to claim 5, characterized in that: include: S1: Determine the span of the bridge to be demolished, the length and position of each bridge block to be demolished, the weight of each bridge block to be demolished, and the construction period according to the design drawings. Based on 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 demolished, pallet size, wheelbase of each first lifting trolley and second lifting trolley, lifting power tonnage, and driving power tonnage parameters of the prefabricated support frame; S2: Use a small truck crane to install the assembled support frame and the track. Use a boom truck to install the track demolition section lifting trolley assembly. The section to be demolished lifting trolley assembly and the lifting rope are passed around and fixed on the front and rear axles of the lifting trolley. The demolition section lifting trolley assembly is moved to the top of the adjacent bridge block to be demolished at the head. The section to be demolished lifting trolley assembly is installed with a tray to support the remaining bridge to be demolished. S3: Use a diamond wire saw to cut the first bridge block to be demolished from the entire bridge according to the design requirements and location. Use a truck crane to crush and decompose the first bridge block to be demolished at the abutment or roadbed. After the crushing and decomposition is completed, use an excavator and a dump truck to transport the crushed waste. Use a truck crane and a boom truck for manual assistance to connect the pallet to the demolition section lifting trolley assembly, and move the demolition section lifting trolley assembly so that the pallet reaches the bottom of the bridge block to be demolished that is adjacent to the first bridge block to be demolished. S4: Separate the adjacent bridge blocks to be demolished from the beam segments to be demolished using a diamond wire saw, and lift the bridge blocks to be demolished using a demolition segment lifting trolley assembly. While the demolition segment lifting trolley assembly is moving along the track toward the abutment, the lifting device in the demolition segment lifting trolley assembly drives the front and rear axles to rotate simultaneously to lift the segmented beam upwards, ensuring that the lifting height does not touch the abutment. S5: After the demolition section trolley assembly reaches the top of the abutment, the bridge blocks to be demolished are slowly lowered to the abutment and then crushed. After the crushing is completed, the crushed waste is transported out using an excavator and a dump truck; S6: The demolition section lifting trolley assembly returns along the track, and at the same time, the lifting rope is lowered. The tray of the demolition section lifting trolley assembly slides along the adjacent bridge block to be demolished that has just been demolished and is hoisted. At the same time, the demolition section lifting trolley assembly also slides along the bridge block to be demolished. S7: The bridge block to be demolished, which is held by the demolition section lifting trolley assembly, is separated from the bridge block to be demolished by using a diamond wire saw. The demolition section lifting trolley assembly lifts the bridge block to the abutment and crushes it; S8: The remaining bridge blocks to be demolished are dismantled, lifted, and crushed and decomposed in a loop according to the steps of S6-S7, until the demolition section lifting trolley assembly moves all the bridge blocks to be demolished except the rear bridge block to be demolished and the bridge blocks to be demolished adjacent to the rear bridge block to be demolished to the abutment and crushes and decomposes them, the demolition section lifting trolley assembly lifts the bridge block to be demolished adjacent to the rear bridge block to be demolished and cuts and separates the bridge block to be demolished from the rear bridge block to be demolished, and the demolition section lifting trolley assembly moves the lifted bridge block to be demolished to the abutment and crushes and decomposes it; S9: Finally, a car crane is used at the abutment to lift the bridge block to be demolished and crush it. After the crushing is completed, an excavator and a dump truck are used to transport the crushed garbage out. At this time, the entire bridge is demolished; S10: 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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