Cable carrying type large-span bridge high-efficiency dismantling device and construction method

Abstract

The application discloses a kind of cable load type large-span bridge high-efficiency dismantling device, including two groups of assembly support frame, several track trolley assemblies, two groups of assembly support frame are oppositely distributed and are set across bridge, track is equipped on assembly support frame, several track trolley assemblies are movably set on the track of two groups of assembly support frame, bridge is divided into several to be dismantled bridge blocks by cutting, except the first and last two blocks of to-be-dismantled bridge blocks with bridge pier in the bottom, the rest to-be-dismantled bridge blocks are connected with to-be-dismantled bridge block by cable and corresponding track trolley assembly of several track trolley assemblies, and several track trolley assemblies are sequentially lifted and transported to the abutment close to by moving on track with the to-be-dismantled bridge block connected with it and broken down;Assembly support frame includes first frame body, second frame body, the first frame body and the second frame body are respectively symmetrically distributed on the left and right sides of bridge, the first frame body and the second frame body one end bottom are respectively equipped with rotating device and abutment connection, and the other end of the first frame body and the second frame body is connected by detachable mode.

Description

A high-efficiency dismantling device and construction method for cable-supported long-span bridges Technical Field

[0001] This invention relates to the field of bridge demolition technology, specifically to a high-efficiency demolition device and construction method for cable-supported long-span bridges. Background Technology

[0002] The bridge engineering community has accumulated considerable experience in bridge demolition design theory, construction methods, and technologies. In recent years, in particular, with the research, development, and utilization of static cutting, crushing, jacking, and hoisting technologies, new construction techniques suitable for bridge demolition have emerged. However, the equipment and construction techniques for demolishing bridges with confined spaces below (i.e., when the bridge's lower section is inaccessible, such as those crossing high canyons, where downstream river supports cannot be installed due to navigation or flood control reasons, or where downstream river management departments do not permit the erection of temporary supports) remain unclear. Furthermore, while bridge erecting machines can be modified for this type of bridge demolition, their installation and dismantling costs are high, and their construction efficiency is low. Summary of the Invention

[0003] In view of the above-mentioned technical problems in the demolition of existing bridges with confined space under the ground, the purpose of this invention is to provide a cable-supported, high-efficiency demolition device and construction method for large-span bridges. This solution can achieve efficient demolition of large-span bridges with confined space under the ground, eliminating the need for the traditional demolition process of large-span bridges to erect multiple substructures or even use large bridge erecting machines and other construction equipment, thereby saving construction costs to a certain extent while demolishing the bridge.

[0004] To achieve the above objectives, the present invention provides a cable-supported high-efficiency demolition device and construction method for long-span bridges, comprising two sets of prefabricated support frames and several track trolley assemblies. The two sets of prefabricated support frames are distributed opposite each other and span the bridge. The prefabricated support frames are equipped with tracks. The several track trolley assemblies are movably mounted on the tracks of the two sets of prefabricated support frames. The bridge is cut into several bridge blocks to be demolished. Except for the first and last two bridge blocks with piers at the bottom, the remaining bridge blocks to be demolished are connected to the corresponding track trolley assemblies by cables. The several track trolley assemblies move on the tracks to sequentially lift the bridge blocks to be demolished to the nearest abutment and break them down.

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

[0006] Furthermore, the first frame and the second frame have the same structure, both including a horizontal frame and a vertical frame. The horizontal frame is horizontally arranged and has a track on its top, on which the track trolley assembly can be mounted.

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

[0008] The crossbeams of the first frame and the crossbeams of the second frame are joined at the center of the bridge span and connected by connecting pins.

[0009] Furthermore, the track trolley assembly consists of a first lifting trolley and a second lifting trolley with identical structures;

[0010] The first and second lifting trolleys are respectively equipped with a front axle and a rear axle at both ends of their bottoms. Track wheels are connected to both ends of the front and rear axles. The first and second lifting trolleys are movably mounted on tracks within two sets of prefabricated support frames via these track wheels.

[0011] The first and second lifting trolleys are equipped with control devices, power devices, and lifting devices. The first and second lifting trolleys can move synchronously along two tracks respectively.

[0012] Cables are connected to the front and rear axles respectively.

[0013] The power unit is connected to the track wheel to provide driving force to 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, thereby making the cable vertically lift and lower. The cable is used to connect to the bridge block to be dismantled. The control device is connected to the power unit and the lifting device respectively, and is used to control the power unit and the lifting device.

[0014] To achieve the above objectives, the present invention provides a construction method for a high-efficiency dismantling device for cable-supported long-span bridges, used in any of the above-mentioned applications, wherein the construction method includes:

[0015] 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 comprehensive consideration of the above factors and the structural bearing capacity calculation, determine the structural span, member type, assembly form, number of each bridge block to be demolished, number of rail trolley components, wheelbase of each rail trolley component, lifting power tonnage, travel power tonnage, and other parameters of the prefabricated support frame.

[0016] S2: Use a small truck crane to install the prefabricated support frame, use a boom truck to install the rail trolley assembly and cable, and after the lifting cable passes around the bottom of the bridge block beam to be dismantled, fix both ends to the front and rear axles of the lifting trolley respectively. After the above work is completed, use a diamond wire saw to cut the bridge according to the design requirements and position according to the designed dividing joint position.

[0017] S3: Use a truck crane at the abutment or roadbed location to lift and crush the two bridge blocks 300 to be demolished from the top of the left and right piers. After crushing and dismantling, use an excavator and dump truck to transport the crushed waste away.

[0018] S4: The two track trolley components on the outside lift the corresponding bridge blocks to be dismantled and move along the track to the bridge abutment positions on both sides. During the process, the lifting device rotates the front and rear axles of the lifting trolley and lifts the divided bridge blocks to be dismantled upwards. The lifting height should be such that it does not touch the bridge abutment.

[0019] S5: After the two outer track trolley assemblies reach the top of the bridge abutment, they slowly descend to the bridge block to be dismantled and then crush it. After crushing, an excavator and a dump truck are used to transport the crushed waste away, and the corresponding track trolley assembly is removed at the same time.

[0020] S6: Repeat S4-S5 above until the remaining bridge blocks to be demolished are removed, lifted and broken up.

[0021] S7: Disconnect the crossbeams of the first and second frames, then rotate the rotating devices at one end of the first and second frames to turn them toward the shore for dismantling and recycling.

[0022] The present invention provides a cable-supported high-efficiency demolition device and construction method for large-span bridges. This solution can achieve efficient demolition of large-span bridges with limited lower space, eliminating the need for traditional large-span bridge demolition processes that require the erection of multiple lower supports or even the use of large bridge erecting machines and other construction equipment. This allows for bridge demolition while saving construction costs to a certain extent.

[0023] Compared with existing technologies, the cable-supported long-span bridge high-efficiency dismantling device and construction method provided by this invention have the following beneficial effects:

[0024] (1) The construction equipment and method can efficiently demolish large-span bridges with limited lower space, eliminating the need to erect multiple lower supports or even use large bridge erecting machines and other construction equipment in the traditional large-span bridge demolition process, thus saving construction costs to a certain extent while demolishing the bridge.

[0025] (2) The bridge demolition equipment and method utilizes multiple lifting trolleys to achieve efficient demolition of the bridge to be demolished. The lifting trolleys are fast, safe, and can be reused.

[0026] (3) The construction equipment and construction method can ensure that the entire demolition process is safe and environmentally friendly. The main decomposition process is carried out on the bridge abutment or roadbed on the bank, which can realize the precise separation of demolition waste and the recycling and reuse of demolition waste. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] Figure 1 is a schematic diagram of the actual application of the cable-supported high-efficiency dismantling device for long-span bridges provided by the present invention.

[0029] Figure 2 is a side view of the cable-supported high-efficiency dismantling device for long-span bridges provided by the present invention.

[0030] Figure 3 is a side view of the track trolley assembly in the cable-supported long-span bridge high-efficiency dismantling device provided by the present invention.

[0031] Figure 4 is a schematic diagram of step 3 in the construction method of the cable-supported long-span bridge high-efficiency demolition device provided by the present invention;

[0032] Figure 5 is a schematic diagram of step 4 in the construction method of the cable-supported long-span bridge high-efficiency demolition device provided by the present invention.

[0033] Figure 6 is a schematic diagram of step 5 in the construction method of the cable-supported long-span bridge high-efficiency demolition device provided by the present invention.

[0034] Illustration:

[0035] 100 prefabricated support frames, 200 track trolley components, and 300 bridge blocks to be dismantled;

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

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0038] The cable-supported, high-efficiency dismantling device for long-span bridges provided by this invention is arranged above a bridge with a confined space below. It moves and dismantles the bridge in sequence through the cooperation of several track trolleys.

[0039] Referring to Figures 1 and 2, which show the structural schematic diagram of the cable-supported high-efficiency dismantling device for long-span bridges provided by the present invention.

[0040] As shown in the figure, the cable-supported high-efficiency dismantling device for long-span bridges provided by the present invention includes two sets of prefabricated support frames 100 and several track trolley components 200.

[0041] Two sets of prefabricated support frames 100 are distributed opposite each other and span the bridge. The prefabricated support frame 100 is equipped with a track 130.

[0042] Several track trolley components 200 are movably mounted on the tracks 130 of two sets of prefabricated support frames 100. The bridge is cut into several bridge blocks 300 to be dismantled. Except for the first and last two bridge blocks 300 with piers at the bottom, the other bridge blocks 300 to be dismantled are connected to the track trolley components 200 by cables 217. The track trolley components 200 move on the tracks 130 to lift the bridge blocks 200 to be dismantled to the nearest abutment and break them down.

[0043] Further, as shown in Figure 1, the prefabricated 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. The bottom of one end of the first frame 110 and the second frame 120 is provided with a rotating device 140 to connect with the bridge abutment. The other end of the first frame 110 and the second frame 120 are connected in a detachable manner.

[0044] After the bridge is dismantled, the prefabricated support frame 100 of the above-mentioned structure can disconnect the connection between the first frame 110 and the second frame 120. Then, the first frame 110 and the second frame 120 are rotated by the rotating device 140 at the bottom, so that the first frame 110 and the second frame 120 are respectively turned to the bridge abutments on both sides for dismantling and recycling.

[0045] Compared to existing technologies, this solution enables the efficient demolition of large-span bridges with limited substructure, eliminating the need for traditional large-span bridge demolition processes that require the erection of multiple substructure supports or the use of large bridge-building machines and other construction equipment. This allows for bridge demolition while simultaneously saving on construction costs to some extent.

[0046] Specifically, as shown in Figure 1 and Figure 2, the first frame 110 and the second frame 120 have the same structure, both including a horizontal frame 111 and a vertical frame 112. The horizontal frame 111 is set horizontally, and its top is provided with a track 130, on which the track trolley assembly 200 can be set.

[0047] The vertical frame 112 is connected to one end of the horizontal frame 111. The bottom of the vertical frame 112 is provided with a rotating device 140, which is connected to the bridge abutment. The vertical frame 112 can rotate through the rotating device 140.

[0048] The crossbeam 111 of the first frame 110 and the crossbeam 111 of the second frame 120 are joined at the center of the bridge span and are preferably connected by a connecting pin.

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

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

[0051] Corresponding to the second bridge block to be dismantled 320, the third bridge block to be dismantled 330, the fourth bridge block to be dismantled 340, and the fifth bridge block to be dismantled 350, this example includes a first track trolley assembly 201, a second track trolley assembly 202, a third track trolley assembly 203, and a fourth track trolley assembly 204.

[0052] 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 + support width + 0.5m. The length of the remaining blocks is determined according to the design and calculation requirements. Assuming the lengths of each block are L1, L2, L3, L4, L5, and L6 respectively, (L1 + L2 + L3 + L4 + L5 + L6 = L, and assuming Lmax = Max(L1, L2, L3, L4, L5, L6)); the structural span design of the prefabricated support frame 100 is Lmax + L + Lmax; the wheelbase of the rail trolley assembly 200 is the length of the segmented block to be lifted by the trolley minus 1m. Taking the wheelbase of the first rail trolley assembly 201 for lifting the second bridge block 320 to be dismantled as an example, the wheelbase of the first rail trolley assembly 201 should be adjusted to: L2car = L2 - 1.

[0053] In practical applications, a small truck crane is used to install the prefabricated support frame 100. The length of the prefabricated support frame 100 extending beyond the expansion joint on each side is controlled to Lmax. Then, the track trolley assembly 200 and cable 217 are installed. The distance between the lifting trolley and cable 217 and the position of each block separation joint is controlled to 0.5m to ensure construction safety.

[0054] In practical application, the first bridge block 310 and the sixth bridge block 360 to be demolished on the top of the left and right piers are first lifted off and then crushed and disassembled, as shown in Figure 4. After crushing and disassembly, an excavator and a dump truck are used to transport the crushed waste away.

[0055] The first track trolley assembly 201 and the fourth track trolley assembly 204, which are responsible for lifting the second bridge block 320 to be dismantled and the fifth bridge block 350 to be dismantled, respectively lift the corresponding bridge blocks to be dismantled and travel along the track 130 to the bridge abutment position. The construction steps are shown in Figure 4.

[0056] After the first track trolley assembly 201 and the fourth track trolley assembly 204, which are responsible for lifting the second bridge block 320 and the fifth bridge block 350 to be demolished, reach the top of the bridge abutment, the second bridge block 320 and the fifth bridge block 350 to be demolished are slowly lowered to the bridge abutment and then crushed. After crushing, an excavator and a dump truck are used to transport the crushed waste away, and at the same time the corresponding lifting trolley is removed, as shown in Figure 6.

[0057] Finally, the remaining third bridge block 330 and fourth bridge block 340 to be dismantled are dismantled, lifted, and broken down using the second track trolley assembly 202 and the third track trolley assembly 203. If there are more blocks, the same steps can be repeated to dismantle, lift, and break down the remaining blocks until all blocks are dismantled.

[0058] Specifically, as shown in Figures 2 and 3, the track trolley assembly 200 in this scheme is composed of a first lifting trolley 210 and a second lifting trolley 220 with identical structures;

[0059] The first lifting trolley 210 and the second lifting trolley 220 are respectively equipped with a front axle 211 and a rear axle 212 at both ends of their bottoms. The front axle 211 and the rear axle 212 are connected to track wheels 213 at both ends. The first lifting trolley 210 and the second lifting trolley 220 are movably mounted on the tracks 130 in the two sets of prefabricated support frames 100 via the track wheels 213.

[0060] The first lifting trolley 210 and the second lifting trolley 220 are equipped with control devices, power devices and lifting devices. The first lifting trolley 210 and the second lifting trolley 220 can move synchronously along the two tracks 130 respectively.

[0061] Cables 217 are connected to the front axle 211 and the rear axle 212 respectively.

[0062] The power unit is connected to the track wheel 213 to provide driving force to 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, thereby causing the cable 217 to be lifted vertically. The cable 217 is used to connect to the bridge block 300 to be dismantled. The control device 212 is connected to the power unit 213 and the lifting device 214 respectively, and is used to control the power unit 213 and the lifting device 214.

[0063] Based on the above-described efficient dismantling device for cable-supported long-span bridges, this solution also provides a construction method, the construction steps of which are as follows:

[0064] S1: Determine the span of the bridge to be demolished, the length and position of each bridge block 300 to be demolished, the weight of each bridge block 300 to be demolished, the construction period, etc., according to the design drawings. Based on the comprehensive consideration of the above factors and the structural bearing capacity calculation, determine the structural span, member type, assembly form, number of each bridge block 300 to be demolished, number of rail trolley components 200, wheelbase of each rail trolley component 200, lifting power tonnage, travel power tonnage, and other parameters of the prefabricated support frame 100.

[0065] S2: Use a small truck crane to install the prefabricated support frame 100, and use a boom truck to install the rail trolley assembly 200 and cable 215. After the lifting cable 215 passes around the bottom of the bridge block 300 to be dismantled, both ends are fixed to the front and rear axles of the lifting trolley. After the above work is completed, use a diamond wire saw to cut the bridge according to the design requirements and position of the design dividing joint (Figure 1 shows the design position of the dividing joint and the relative position of each piece of equipment).

[0066] S3: Use a truck crane at the abutment or roadbed location to lift and crush the two bridge blocks 300 to be demolished from the top of the left and right piers, as shown in Figure 4. After crushing and decomposition, use an excavator and dump truck to transport the crushed waste away.

[0067] S4: The two track trolley components 200 on the outside lift the corresponding bridge blocks 300 to be dismantled and move along the track 130 to the bridge abutment positions on both sides. During the process, the lifting device rotates the front and rear axles of the lifting trolley and lifts the divided bridge blocks 300 to be dismantled upwards. The lifting height should be such that it does not touch the bridge abutment (generally 20cm higher than the bridge abutment is sufficient). The construction steps are shown in Figure 5.

[0068] S5: After the two track trolley assemblies 200 on the outside reach the top of the bridge abutment, they slowly lower the bridge block 300 to be dismantled to the bridge abutment and then crush it. After crushing, an excavator and a dump truck are used to transport the crushed waste away, and at the same time, the corresponding track trolley assembly 200 is removed, as shown in Figure 6.

[0069] S6: Repeat S4-S5 above until the remaining 300 bridge blocks to be demolished are removed, lifted and broken up.

[0070] S7: Disconnect the connection between the crossbeam 111 of the first frame 110 and the crossbeam 111 of the second frame 120, and then rotate 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 toward the shore for dismantling and recycling.

[0071] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency dismantling device for cable-supported long-span bridges, characterized in that, The system includes two sets of prefabricated support frames and several track trolley assemblies. The two sets of prefabricated support frames are distributed opposite each other and span the bridge. Each prefabricated support frame is equipped with a track, and the track trolley assemblies are movably mounted on the tracks of the two sets of prefabricated support frames. The bridge is divided into several bridge blocks to be dismantled. Except for the first and last two bridge blocks with piers at the bottom, the remaining bridge blocks are connected to the corresponding track trolley assemblies via cables. The track trolley assemblies move along the tracks, sequentially lifting the bridge blocks to be dismantled to nearby locations. The bridge abutments are dismantled and broken down. The prefabricated support frame includes a first frame and a second frame, which are symmetrically distributed on the left and right sides of the bridge. Each of the first and second frames has a rotating device at one end for rotating the entire frame to the bank. The rotating device is connected to the bridge abutment. The other ends of the first and second frames are detachably connected at the center of the bridge span. After all the bridge blocks to be dismantled are hoisted and broken down, the detachable connection between the first and second frames is disconnected, and the first and second frames are rotated to the bank by the rotating device for dismantling and recycling.

2. The high-efficiency dismantling device for cable-supported long-span bridges according to claim 1, characterized in that, The first and second frames have the same structure, both including a horizontal frame and a vertical frame. The horizontal frame is horizontally arranged and has a rail on its top for mounting the rail trolley assembly. The vertical frame is connected to one end of the horizontal frame and has a rotating device at its bottom. The rotating device is connected to the bridge abutment and can rotate through the rotating device. The horizontal frames of the first and second frames are connected at the center of the bridge span by a connecting pin.

3. The high-efficiency dismantling device for cable-supported long-span bridges according to claim 1, characterized in that, The track trolley assembly consists of a first lifting trolley and a second lifting trolley with identical structures. The first and second lifting trolleys are respectively equipped with a front axle and a rear axle at their bottom ends. Track wheels are connected to both ends of the front and rear axles. The first and second lifting trolleys are movably mounted on tracks in two sets of prefabricated support frames via the track wheels. Each lifting trolley houses a control device, a power device, and a lifting device. The first and second lifting trolleys travel synchronously along the two tracks. Cables are connected to the front and rear axles. The power device is connected to the track wheels to provide driving force. The lifting device is connected to both the front and rear axles, enabling them to rotate and thus vertically raise and lower the cables. The cables are used to connect to the bridge blocks to be dismantled. The control device is connected to both the power device and the lifting device to control them.

4. A construction method for using the high-efficiency demolition device for cable-supported long-span bridges according to any one of claims 1 to 3, 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, the construction period, etc., according to the design drawings. Based on the comprehensive consideration of the above factors and the structural bearing capacity calculation, determine the structural span, member type, assembly form, number of each bridge block to be demolished, number of rail trolley components, wheelbase of each rail trolley component, lifting power tonnage, travel power tonnage, and other parameters of the prefabricated support frame; S2: Use a small truck crane to install the prefabricated support frame, use a boom truck to install the rail trolley components and cables, and after the lifting cables pass around the bottom of the bridge block beam to be demolished, fix both ends to the front and rear axles of the lifting trolley respectively. After the above work is completed, use a diamond wire saw to cut the bridge according to the design requirements and position according to the designed dividing joint position; S3: Use a truck crane at the bridge abutment or roadbed position to lift away the two bridge blocks (300) on the top of the left and right piers and crush them. After crushing and decomposing, use an excavator and dump truck to transport the crushed waste away; S4: The two outer track trolley assemblies lift the corresponding bridge blocks to be dismantled and move them along the tracks to the bridge abutments on both sides. During the process, the lifting device rotates the front and rear axles of the lifting trolleys to lift the segmented bridge blocks to be dismantled upwards, ensuring that the lifting height does not touch the bridge abutments; S5: After the two outer track trolley assemblies reach the top of the bridge abutments, they slowly lower the bridge blocks to be dismantled to the bridge abutments and then crush them. After crushing, an excavator and a dump truck are used to transport the crushed waste away, and the corresponding track trolley assemblies are removed at the same time; S6: Repeat S4-S5 until the remaining bridge blocks to be dismantled are removed, lifted away, and crushed; S7: Disconnect the detachable connection between the crossbeams of the first frame and the crossbeams of the second frame. Then, using the rotating devices set at the bottom of the first and second frames, rotate the first and second frames to the banks on both sides respectively. Finally, dismantle and recycle the rotated and recovered first and second frames on the banks.

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