A pallet-supported bridge demolition device and construction method using a closed track

Abstract

The present invention discloses a pallet-supported bridge demolition device and construction method using a closed track, comprising two groups of assembled support frames, a demolition section lifting trolley assembly, and a to-be-demolished section lifting trolley assembly, the two groups of assembled support frames are relatively distributed and arranged across the bridge, the assembled support frames are provided with a closed double track, the demolition section lifting trolley assembly, the to-be-demolished section lifting trolley assembly are provided with track wheels corresponding to the closed double track and a cable at the bottom, the cable is connected to a pallet, the axis direction of the track wheel is perpendicular to the closed double track, a track groove is provided on the closed double track, the track wheel is inserted into the track groove along one end of the closed double track, a limiting structure for limiting the track wheel is provided in the track groove, the track wheel can move along the length direction of the track groove, and the limiting structure can limit the vertical movement of the track wheel, so that the lifting trolley has high stability when moving during the demolition process, thereby improving the reliability of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge demolition, and in particular to a pallet-supported bridge demolition device using a closed track 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, or where support cannot be installed in the lower river due to navigation or flood control, or where the lower river management department does not permit the erection of temporary supports) are still unclear.

[0003] In addition, the bridge-building machine can be used for the demolition of such bridges after modification, but the installation and removal costs of the bridge-building machine for bridge demolition are expensive and the construction efficiency is low. Summary of the Invention

[0004] In view of the above technical problems in the demolition of existing bridges with limited lower space, the purpose of the present invention is to provide a pallet-supported bridge demolition device and construction method using a closed track. 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 or even use large bridge erection equipment such as construction equipment, thereby achieving bridge demolition while saving construction costs to a certain extent.

[0005] In addition, this solution adopts a closed double track to be connected with the track wheel, and a limiting structure for limiting the track wheel is provided in the track groove. The limiting structure can limit the vertical movement of the track wheel, so that the lifting trolley assembly has high stability when moving during the dismantling process, which can improve the reliability of the device.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a pallet-supported bridge demolition device using a closed track, comprising two sets of assembled support frames, a demolition section lifting trolley assembly, and a to-be-dismantled section lifting trolley assembly.

[0007] The two groups of assembled support frames are relatively distributed and arranged across the bridge. The assembled support frames are provided with closed double tracks. The demolition section lifting trolley assembly and the bottom of the to-be-dismantled section lifting trolley assembly are provided with track wheels corresponding to the closed double tracks and cables. The cables are connected to a tray. The axis direction of the track wheels is perpendicular to the closed double tracks. A track groove is provided on the closed double tracks. The track wheels are inserted into the track groove along one end of the closed double tracks. A limiting structure for limiting the position of the track wheels is provided in the track groove. The track wheels can move along the length direction of the track groove, and the limiting structure can limit the vertical movement of the track wheels.

[0008] 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;

[0009] 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 demolition section lifting trolley assembly to the abutment and breaks it down.

[0010] The demolition section lifting trolley assembly cooperates with the to-be-demolished section lifting trolley assembly, and by moving on the closed double track, the demolition section lifting trolley assembly sequentially lifts all the to-be-demolished bridge blocks except the tail bridge block and the adjacent to-be-demolished bridge block to the abutment and crushes and decomposes them.

[0011] The lifting trolley assembly of the section to be demolished moves on the closed double 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.

[0012] 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.

[0013] 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 arranged horizontally, and a closed double track is provided on the top thereof. The closed double track is provided with a track groove for the removal of the section lifting trolley assembly, and the section to be removed lifting trolley assembly is arranged thereon;

[0014] 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;

[0015] 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.

[0016] 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;

[0017] The first lifting trolley and the second lifting trolley both include a car body, both sides of which extend vertically downward to form a connecting portion, which is connected to the rail wheel.

[0018] Two rotating shafts are provided at both ends of the bottom of the vehicle body, and cables are respectively connected to the two rotating shafts. The cables on the two rotating shafts in the first lifting trolley and the cables on the two rotating shafts in the second lifting trolley cooperate to connect to the four corners of the pallet respectively.

[0019] 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 closed double tracks;

[0020] The power unit is connected to the track wheel to provide driving force for the track wheel. The lifting device is connected to the two rotating shafts respectively and can drive the rotating shafts to rotate, so that the cable 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 to control the power unit and the lifting device.

[0021] Furthermore, the tray is composed of overlapping polytetrafluoroethylene plates and steel plates, and the four corners of the top of the polytetrafluoroethylene plates are respectively provided with connecting parts for connecting with cables.

[0022] Furthermore, the closed double track includes a first track and a second track, the first track and the second track are arranged on the top of the cross frame along the length direction of the cross frame, and the first track and the second track are arranged parallel to each other, and the first track and the second track are respectively connected to the track wheels on both sides of the vehicle body;

[0023] The first track and the second track have the same structure, both comprising a horizontally arranged bottom plate and vertical plates vertically connected to both sides of the bottom plate. The bottom plate and the vertical plates are connected to form a C-shaped track groove for the track wheels to be placed.

[0024] The two vertical plates are provided with first limiting plates on the opposite side walls, and a gap is provided between the two first limiting plates. The track wheel is composed of an upper rim, a lower rim, and a rim connecting portion connected between the upper rim and the lower rim. The upper rim and the lower rim rim connecting portion form an I-shape through a connecting cross section, and a slot is formed between the upper rim and the lower rim.

[0025] The track wheel is located in the gap between the two first limiting plates, and the two first limiting plates are respectively located on both sides of the track wheel and are respectively inserted in the slots between the upper wheel rim and the lower wheel rim. In this way, the track wheel can move along the length direction of the first limiting plates by rotation, and the first limiting plates are engaged with the slots to limit the vertical movement of the track wheel, thereby preventing the track wheel from falling off.

[0026] Furthermore, the free ends of the two vertical plates extend toward each other to form second limit plates, and the two second limit plates are respectively located on both sides of the connecting part. The two second limit plates are respectively fitted with the connecting part in a clearance to limit the horizontal movement of the connecting part.

[0027] In order to achieve the above object, the present invention provides a construction method of a pallet-supported bridge demolition device using a closed track, which is used for any of the above items, and the construction method includes:

[0028] 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, the construction period, etc., according to the design drawings. Based on the above factors and the structural bearing capacity calculation, 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, driving power tonnage and other parameters of the prefabricated support frame;

[0029] S2: Use a small truck crane to install the assembled support frame and the enclosed double track. Use a boom truck to install the track demolition section lifting trolley assembly. The section to be demolished lifting trolley assembly and cables are passed around and fixed on the two rotating shafts 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.

[0030] 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 dump truck to transport the crushed waste. Use a truck crane and 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.

[0031] 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 blocks to be demolished. While the demolition section lifting trolley assembly is moving along the closed double track toward the abutment, the lifting device in the demolition section lifting trolley assembly drives two rotating shafts to rotate simultaneously to lift the segmented beam upwards, ensuring that the lifting height does not touch the abutment.

[0032] 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;

[0033] S6: The demolition section lifting trolley assembly returns along the closed double track, and at the same time, the cable 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.

[0034] 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;

[0035] 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;

[0036] 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;

[0037] 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.

[0038] The present invention provides a tray-supported bridge demolition device and construction method using a closed track. 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-scale bridge erection equipment in the traditional large-span bridge demolition process. This can achieve bridge demolition while saving construction costs to a certain extent.

[0039] In addition, this solution adopts a closed double track to be connected with the track wheel, and a limiting structure for limiting the track wheel is provided in the track groove. The limiting structure can limit the vertical movement of the track wheel, so that the track trolley assembly has high stability when moving during the dismantling process, which can improve the reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0041] Figure 1 A schematic front view of the structure of a tray-supported bridge demolition device using a closed track provided by the present invention;

[0042] Figure 2 A schematic side view of the structure of a tray-supported bridge demolition device using a closed track provided by the present invention;

[0043] Figure 3 A schematic structural diagram of a pallet in a pallet-supported bridge demolition device using a closed track provided by the present invention;

[0044] Figure 4 This is a schematic structural diagram of the first lifting trolley in the pallet-supported bridge demolition device using a closed track provided by the present invention;

[0045] Figure 5 A schematic structural diagram of the first track in the pallet-supported bridge demolition device using a closed track provided by the present invention;

[0046] Figure 6 A schematic diagram of the first lifting trolley in the tray-supported bridge demolition device using a closed track provided by the present invention and connected to the closed double track;

[0047] Figure 7 A schematic diagram of step 3 in the construction method of the pallet-supported bridge demolition device using a closed track provided by the present invention;

[0048] Figure 8A schematic diagram of step 4 in the construction method of the pallet-supported bridge demolition device using a closed track provided by the present invention;

[0049] Figure 9 A schematic diagram of step 5 in the construction method of the pallet-supported bridge demolition device using a closed track provided by the present invention;

[0050] Figure 10 A schematic diagram of step 6 in the construction method of the pallet-supported bridge demolition device using a closed track provided by the present invention;

[0051] Figure 11 This is a schematic diagram of step 7 in the construction method of the pallet-supported bridge demolition device using a closed track provided by the present invention.

[0052] Illustration:

[0053] Assembled support frame 100, demolished section lifting trolley assembly 200, to-be-dismantled section lifting trolley assembly 300, to-be-dismantled bridge block 400;

[0054] The first frame 110, the horizontal frame 111, the vertical frame 112, the second frame 120, the closed double track 130, the first track 131, the bottom plate 131a, the vertical plate 131b, the first limiting plate 131d, the second limiting plate 131e, the second track 132, the rotating device 140, the vehicle body 211, the connecting part 212, the track wheel 213, the upper wheel rim 213a, the lower wheel rim 213b, the wheel rim connecting part 213c, the slot 213d, the rotating shaft 214, the cable 215, the tray 216, the polytetrafluoroethylene plate 216a, the steel plate 216b, the connecting part 216c, the first lifting trolley 210, 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

[0055] 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.

[0056] See also Figures 1-6 , which shows a structural schematic diagram of a pallet-supported bridge demolition device using a closed track provided by the present invention.

[0057] As can be seen from the drawings, the pallet-supported bridge demolition device using a closed track 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.

[0058] Two sets of assembled support frames 100 are relatively distributed and arranged across the bridge, and a closed double track 130 is provided on the assembled support frames 100;

[0059] The dismantling section lifting trolley assembly 200 and the to-be-dismantled section lifting trolley assembly 300 are provided with a track wheel 213 corresponding to the closed double track 130 and a cable 215 at the bottom. The cable 215 is connected to a tray 216. The axis direction of the track wheel 213 is perpendicular to the closed double track 130. The closed double track 130 is provided with a track groove. The track wheel 213 is inserted into the track groove along one end of the closed double track 130. The track groove is provided with a limiting structure for limiting the position of the track wheel 213. The track wheel 213 can move along the length direction of the track groove, and the limiting structure can limit the vertical movement of the track wheel 213.

[0060] 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 to be demolished is cut from the entire bridge and is 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 to be demolished by the first bridge block 400 to be demolished. The to-be-demolished section lifting trolley assembly 300 lifts the remaining bridge blocks to be demolished by means of the pallet 216 to ensure the stability of the uncut and separated bridge blocks to be demolished.

[0061] The demolition section lifting trolley assembly 200 lifts the bridge block 400 to be demolished below it through the pallet 216, 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.

[0062] The demolition section lifting trolley assembly 200 cooperates with the to-be-demolished section lifting trolley assembly 300. By moving on the closed double track 130, the demolition section lifting trolley assembly 200 sequentially lifts 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.

[0063] The section-to-be-demolished lifting trolley assembly 300 moves on the closed double track 130 and supports the remaining bridge to be demolished until the section-to-be-demolished lifting trolley assembly 300 lifts the bridge block 400 adjacent to the rear bridge block 400 to be demolished and cuts the bridge block 400 to be demolished apart from the rear bridge block 400 to be demolished. The section-to-be-demolished lifting trolley assembly 300 moves the lifted bridge block 400 to the abutment and crushes it, and finally lifts the rear bridge block 400 to be demolished away by a crane and crushes it, thereby completing the demolition of the entire bridge.

[0064] Furthermore, if Figure 1The 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.

[0065] 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.

[0066] 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.

[0067] In addition, in this solution, the section-lifting trolley assembly 200 is removed, and the section-lifting trolley assembly 300 to be removed is set in the track groove of the closed double track 130 through the track wheel 213. The limiting structure in the track groove can limit the vertical movement of the track wheel 213, so that the section-lifting trolley assembly 200 and the section-lifting trolley assembly 300 to be removed have no derailment risk, have a large bearing capacity, and can improve the stability of the trolley during driving, reducing the risk of instability of the bridge to be demolished caused by the left and right shaking of the wheels when driving on traditional types of tracks.

[0068] 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 closed double track 130 on its top. The closed double track 130 has a track groove for the dismantling section lifting trolley assembly 200, and the section to be dismantled lifting trolley assembly 300 is arranged thereon;

[0069] 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.

[0070] 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.

[0071] Furthermore, if Figure 1As 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;

[0072] 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;

[0073] Assuming the bridge span is L (the distance between the expansion joints at both ends of the bridge), the length of the two blocks at the top of the piers on both sides is recommended to be 0.5m + the support width + 0.5m. The lengths of the remaining blocks are determined according to the design and calculation requirements. Assuming the lengths of each block are L1, L2, L3, L4, L5, and L6, (L1+L2+L3+L4+L5+L6=L, and assuming 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 segmented block to be lifted by the trolley minus 1m. Taking the wheelbase of the second bridge block 420 to be demolished as an example, the wheelbase of the first rail trolley assembly 201 should be adjusted to: L2 car = L2-1.

[0074] 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 dismantling section lifting trolley assembly 200 and the to-be-dismantled section lifting trolley assembly 300 and the cable 215 are installed, and the dismantling section lifting trolley assembly 200 is only installed with the cable 215 and the pallet 216 is not installed for the time being; the four corners of the pallet 216 of the to-be-dismantled section lifting trolley assembly 300 are respectively fixed to the front and rear axles of the to-be-dismantled section lifting trolley assembly 300 through the two ends of the cable 215, and the position of the to-be-dismantled section lifting trolley assembly 300 and the cable 215 are controlled to be 0.5m away from the position of the separation joint to ensure construction safety.

[0075] 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;

[0076] 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 216 and broken into pieces.

[0077] 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 ;

[0078] 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;

[0079] 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.

[0080] Specifically, such as Figure 2 , Figure 4 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;

[0081] The first lifting trolley 210 and the second lifting trolley 220 both include a vehicle body 211 , with both sides of the vehicle body 211 extending vertically downward to form a connecting portion 212 , which is connected to a track wheel 213 .

[0082] In this way, the first lifting trolley 210 and the second lifting trolley 220 are movably arranged on the closed double tracks 130 in the two sets of assembled support frames 100 through the track wheels 213.

[0083] Two shafts 214 are provided at both ends of the bottom of the vehicle body 211, and cables 215 are connected to the two shafts 214 respectively.

[0084] The cables 215 on the two rotating shafts 214 in the first lifting trolley 210 and the cables 215 on the two rotating shafts 214 in the second lifting trolley 220 cooperate to connect to the four corners of the tray 216 respectively;

[0085] 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 two closed double tracks 130;

[0086] 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 two rotating shafts 214 respectively, and can drive the rotating shafts 214 to rotate, so that the cable 215 can be lifted and lowered vertically. The tray 216 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.

[0087] The cable 215 is preferably a steel wire rope in this solution;

[0088] like Figure 3 The tray 216 is composed of overlapping PTFE plates 216a and steel plates 216b. The four corners of the top of the PTFE plate 216a are respectively provided with connecting parts 216c for connecting with the cable 215. The tray 216 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.

[0089] In this solution, a closed double track 130 is used to cooperate with the track wheels 213 on both sides of the vehicle body 211 to achieve stable and reliable movement. The closed double track 130 is set on the top of the cross frame 111 in the first frame 110 and the second frame 120;

[0090] like Figure 2 , Figure 5 The closed double track 130 includes a first track 131 and a second track 132. The first track 131 and the second track 132 are arranged on the top of the cross frame 111 along the length direction of the cross frame 111, and the first track 131 and the second track 132 are arranged parallel to each other. The first track 131 and the second track 132 are respectively connected to the track wheels 213 on both sides of the vehicle body 211.

[0091] The first track 131 and the second track 132 have the same structure, both including a horizontally arranged bottom plate 131a and vertical plates 131b vertically connected to both sides of the bottom plate 131a. The bottom plate 131a and the vertical plates 131b are connected to form a C-shaped track groove for the track wheel 213 to be placed.

[0092] The first limiting plates 131d are vertically provided on the opposite side walls of the two vertical plates 131b, and a gap is provided between the two first limiting plates 131a. Figure 3 The track wheel 213 is composed of an upper rim 213a, a lower rim 213b and a rim connecting portion 213c connected between the upper rim 213a and the lower rim 214b. The upper rim 213a and the lower rim 213b rim connecting portion 213c form an I-shape by connecting the cross section. A slot 213d is formed between the upper rim 213a and the lower rim 213b.

[0093] The track wheel 213 is located in the gap between the two first limiting plates 131a. The two first limiting plates 131a are respectively located on both sides of the track wheel 213 and are respectively inserted into the clamping grooves 213d between the upper wheel rim 213a and the lower wheel rim 213b. In this way, the track wheel 213 can move along the length direction of the first limiting plates 131d by rotating. The first limiting plates 131d are engaged with the clamping grooves 213d to limit the vertical movement of the track wheel 213, thereby preventing the track wheel 213 from falling off.

[0094] The track wheel 213 and the closed double track 130 of the above-mentioned structure form a double track by adopting the first track 131 and the second track 132. Through snap-fitting, the two track wheels 213 are respectively arranged on the first track 131 and the second track 132 in a horizontally movable and vertically immovable manner, which can greatly improve the stability of the track trolley assembly 200 during movement.

[0095] In order to further improve the stability of the rail trolley assembly 200 during movement, the free ends of the two vertical plates 131b extend toward each other to form second limit plates 131e. The two second limit plates 131e are respectively located on both sides of the connecting part 212. The two second limit plates 131e are respectively fitted with the connecting part 212 in a clearance to limit the horizontal movement of the connecting part 212.

[0096] Based on the above scheme, the pallet-supported bridge demolition device using a closed track is constructed. This scheme also provides a construction method. The construction steps are as follows:

[0097] 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 structural bearing capacity calculation, determine the structural span, rod type, assembly form, number of bridge blocks 400 to be demolished, size of the pallet 216, wheelbase of each first lifting trolley 210 and second lifting trolley 220, lifting power tonnage, driving power tonnage and other parameters of the assembled support frame 100;

[0098] S2: Use a small truck crane to install the assembled support frame 100 and the closed double track 130, 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 cable 215, the cable 215 is passed around the two rotating shafts 214 fixed on the lifting trolley, 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 216 to support the remaining bridge to be demolished, such as Figure 1 ;

[0099] 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 216 to the demolition section lifting trolley assembly 200, and the demolition section lifting trolley assembly 200 is moved so that the pallet 216 reaches the bottom of the bridge block 400 to be demolished adjacent to the first bridge block 400 to be demolished. Figure 7 shown.

[0100] 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 closed double track 130 toward the abutment position, the pulling device 214 in the demolishing section lifting trolley assembly 200 drives the two rotating shafts 214 to rotate simultaneously to lift the divided beam upward, 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 8 As shown;

[0101] 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 9 As shown;

[0102] S6: The dismantling section lifting trolley assembly 200 returns along the closed double track 130, while lowering the cable 215. Figure 5 As shown, the tray 216 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 10 shown.

[0103] S7: The bridge block 400 to be demolished, which is lifted by the demolition section lifting trolley assembly 200, is separated from the bridge to be demolished by a diamond wire saw. The demolition section lifting trolley assembly 200 lifts the bridge block 400 to the abutment and breaks it into pieces. Figure 11 ;

[0104] S8: The remaining bridge blocks 400 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 200 moves all the bridge blocks 400 to be demolished except the rear bridge block 400 to be demolished and the bridge blocks 400 to be demolished adjacent to the rear bridge block 400 to be demolished to the abutment and crush and decompose them, the section to be demolished pulling trolley assembly 300 lifts the bridge block 400 to be demolished adjacent to the rear bridge block 400 to be demolished and cuts and separates the bridge block 400 to be demolished from the rear bridge block 400 to be demolished, and the section to be demolished pulling trolley assembly 300 moves the lifted bridge block 400 to be demolished to the abutment and crushes and decomposes it;

[0105] S9: Finally, a car crane is used at the abutment position to lift the rear bridge block 400 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;

[0106] S10: 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.

[0107] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A pallet-supported bridge demolition device using a closed track, 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 closed double tracks. The demolition section lifting trolley assembly and the bottom of the to-be-dismantled section lifting trolley assembly are provided with track wheels corresponding to the closed double tracks and cables. The cables are connected to a tray. The axis direction of the track wheels is perpendicular to the closed double tracks. A track groove is provided on the closed double tracks. The track wheels are inserted into the track groove along one end of the closed double tracks. A limiting structure for limiting the position of the track wheels is provided in the track groove. The track wheels can move along the length direction of the track groove, and the limiting structure can limit the vertical movement of the track wheels. 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 demolition section lifting trolley assembly to the abutment and breaks it down. The demolition section lifting trolley assembly cooperates with the to-be-demolished section lifting trolley assembly, and by moving on the closed double track, the demolition section lifting trolley assembly sequentially lifts all the to-be-demolished bridge blocks except the tail bridge block and the adjacent to-be-demolished bridge block to the abutment and crushes and decomposes them. The lifting trolley assembly of the section to be demolished moves on the closed double 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 bridge demolition device using a closed track 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 closed track tray-supported bridge demolition device according to claim 2 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 closed double track is provided on the top thereof. The closed double track is provided with a track groove for the removal of the section lifting trolley assembly, and the section to be removed lifting trolley assembly is 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 bridge demolition device using a closed track 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 both include a car body, both sides of which extend vertically downward to form a connecting portion, which is connected to the rail wheel. Two rotating shafts are provided at both ends of the bottom of the vehicle body, and cables are respectively connected to the two rotating shafts. The cables on the two rotating shafts in the first lifting trolley and the cables on the two rotating shafts in the second lifting trolley cooperate to connect to the four corners of the pallet respectively. 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 closed double tracks; The power unit is connected to the track wheel to provide driving force for the track wheel. The lifting device is connected to the two rotating shafts respectively and can drive the rotating shafts to rotate, so that the cable 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 to control the power unit and the lifting device.

5. The tray-supported bridge demolition device using a closed track 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 cables.

6. The tray-supported bridge demolition device using a closed track according to claim 5 is characterized in that: The closed double track includes a first track and a second track, wherein the first track and the second track are arranged on the top of the cross frame along the length direction of the cross frame, and the first track and the second track are arranged parallel to each other, and the first track and the second track are respectively connected to the track wheels on both sides of the vehicle body; The first track and the second track have the same structure, both comprising a horizontally arranged bottom plate and vertical plates vertically connected to both sides of the bottom plate. The bottom plate and the vertical plates are connected to form a C-shaped track groove for the track wheels to be placed. The two vertical plates are provided with first limiting plates on the opposite side walls, and a gap is provided between the two first limiting plates. The track wheel is composed of an upper rim, a lower rim, and a rim connecting portion connected between the upper rim and the lower rim. The upper rim and the lower rim rim connecting portion form an I-shape through a connecting cross section, and a slot is formed between the upper rim and the lower rim. The track wheel is located in the gap between the two first limiting plates, and the two first limiting plates are respectively located on both sides of the track wheel and are respectively inserted in the slots between the upper wheel rim and the lower wheel rim. In this way, the track wheel can move along the length direction of the first limiting plates by rotation, and the first limiting plates are engaged with the slots to limit the vertical movement of the track wheel, thereby preventing the track wheel from falling off.

7. The tray-supported bridge demolition device using a closed track according to claim 6 is characterized in that: The free ends of the two vertical plates extend toward each other to form second limit plates. The two second limit plates are respectively located on both sides of the connecting portion. The two second limit plates are respectively fitted with a gap with the connecting portion to limit the horizontal movement of the connecting portion.

8. A construction method of a pallet-supported bridge demolition device using a closed track according to claim 7, 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 enclosed double track. Use a boom truck to install the track demolition section lifting trolley assembly. The section to be demolished lifting trolley assembly and cables are passed around and fixed on the two rotating shafts 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 dump truck to transport the crushed waste. Use a truck crane and 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 use the demolition section lifting trolley assembly to lift the bridge blocks to be demolished. While the demolition section lifting trolley assembly is moving along the closed double track toward the abutment, the lifting device in the demolition section lifting trolley assembly drives two rotating shafts to rotate simultaneously to lift the segmented beam upwards, ensuring that the lifting height does not touch the abutment. 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; S6: The demolition section lifting trolley assembly returns along the closed double track, and at the same time, the cable 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 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; 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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