A dismantling and transporting integrated device and method for a main arch of an existing expressway arch bridge

Abstract

The application discloses a dismantling and transporting integrated device and method for a main arch of an existing highway arch-shaped overbridge, and belongs to the technical field of bridge engineering construction. The dismantling and transporting integrated device comprises top-layer steel pipe supports, the top-layer steel pipe supports are two in number, the lower end of the top-layer steel pipe supports is connected with middle-layer steel pipe supports, one end of the middle-layer steel pipe supports, which is far away from the top-layer steel pipe supports, is connected with bottom-layer steel pipe supports, one end of the bottom-layer steel pipe supports, which is far away from the middle-layer steel pipe supports, is connected with a leveling steel plate, a self-propelled hydraulic module vehicle group is installed at the lower end of the leveling steel plate, the self-propelled hydraulic module vehicle group comprises a plurality of self-propelled hydraulic module vehicles, and a plurality of hydraulic winches are connected to one end of the top-layer steel pipe supports, which is far away from the middle-layer steel pipe supports. The whole device has simple structure, is convenient to process materials and assemble equipment, is high in reliability, strong in economy, and can be repeatedly used in similar arch-shaped overbridge dismantling projects of existing highways, and solves the problem that the traditional bridge dismantling mode cannot be used for batch flow construction.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and more specifically, to an integrated dismantling and transportation device and method for the main arch of an existing highway arched overpass. Background Technology

[0002] With the increasing number of cars owned by Chinese residents and the growing number of families traveling by car, some four-lane highways are frequently congested. Therefore, transportation authorities are gradually upgrading and expanding these congested highways into eight-lane highways to alleviate traffic pressure. During the upgrading and expansion of existing highways, a pressing issue is how to quickly, safely, economically, and rationally dismantle the main arch structures of numerous existing highway overpasses along the routes, minimizing their adverse impact on traffic flow.

[0003] Currently, the dismantling and removal of the main arch of existing highway arch bridges can be carried out by explosive blasting. This method involves many construction procedures, a long period of highway closure, many uncontrollable factors, and a lot of coordination among all parties in the early stage. Alternatively, mechanical drilling and blasting can be used for demolition. This method requires more on-site construction machinery and equipment, is difficult to organize and coordinate, is prone to collapse accidents, and generates more concrete waste, dust and wastewater, resulting in low environmental benefits. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated dismantling and transportation device and method for the main arch of an existing highway arched overpass, so as to solve the problems mentioned in the background art.

[0005] A dismantling and transportation integrated device for the main arch of an existing highway arched overpass includes a self-propelled hydraulic modular vehicle group, a bottom layer steel pipe support, a middle layer steel pipe support, a top layer steel pipe support, and hydraulic winches. There are two top layer steel pipe supports. The lower end of each top layer steel pipe support is connected to a middle layer steel pipe support via a flange. The flange at the end of the middle layer steel pipe support away from the top layer steel pipe support is connected to the bottom layer steel pipe support. A horizontally arranged leveling steel plate is connected to the end of the bottom layer steel pipe support away from the middle layer steel pipe support. A self-propelled hydraulic modular vehicle group is installed at the lower end of the leveling steel plate. The self-propelled hydraulic modular vehicle group includes several self-propelled hydraulic modular vehicles. Several hydraulic winches are connected to the end of the top layer steel pipe support away from the middle layer steel pipe support.

[0006] Preferably, the end of the hydraulic winch closest to the top-level steel pipe support is connected to a hoisting wire rope, and the end of the hoisting wire rope furthest from the hydraulic winch is connected to a lifting point wire rope.

[0007] Preferably, a wind cable is connected to the side of the middle-layer steel pipe support near the end of the main arch cutting body. A third layer of detachable flange-connected steel support is connected to each middle-layer steel pipe support. The top surface of the third layer of detachable flange-connected steel support is fitted with the bottom curve of the main arch cutting body. A limiting threaded steel bar is provided at the center of the third layer of detachable flange-connected steel support to limit the movement of the main arch cutting body. A second layer of detachable flange-connected steel support is provided at the end of the third layer of detachable flange-connected steel support away from the hydraulic winch.

[0008] Preferably, both ends of the second-layer detachable flange-connected steel support are connected to the middle-layer steel pipe support, and a first-layer detachable flange-connected steel support is provided on the side of the second-layer detachable flange-connected steel support away from the third-layer detachable flange-connected steel support, and both ends of the first-layer detachable flange-connected steel support are connected to the bottom-layer steel pipe support.

[0009] Preferably, the suspension point wire rope is connected to the main arch cutting body by a perforated rope bottom connection, and the main arch cutting body at the suspension point wire rope is connected to the two ends of the transverse bridge of the main arch cutting body with a protective net base. The protective net base is connected to the upper layer of tie wire rope above the main arch cutting body, and the upper layer of tie wire rope is connected to the lower layer of tie wire rope below the main arch cutting body. The protective net base is connected to the two ends of the cantilevered steel section, and the outer side of the cantilevered steel section is connected to the protective wire mesh.

[0010] Preferably, the lower tie wire rope is provided with a lower flame-retardant dense mesh protective net away from the upper tie wire rope, and the lower flame-retardant dense mesh protective net is connected to both ends of the protective net base.

[0011] As a general inventive concept, this invention also provides a method for dismantling and transporting the main arch of an existing highway arched overpass, comprising the following steps:

[0012] S1: Carry out preliminary preparations, use a rebar detector to mark the longitudinal and transverse rebar positions of the bridge abutment, the main arch cutting body of the arched skybridge, and the cantilevered main arch ring, and determine the cutting position and drilling position of the main arch of the arched skybridge to be demolished.

[0013] S2: Dismantle the bridge deck structure and arch columns of the arched overpass; simultaneously fabricate the bottom, middle, and top steel pipe supports for erecting the steel pipe scaffolding; install the third and second layers of detachable flange-connected steel supports from top to bottom on the middle layer steel pipe supports; install the first layer of detachable flange-connected steel supports on the bottom layer steel pipe supports; pre-install a hydraulic winch on the top layer steel pipe supports; connect a hoisting wire rope to the end of the hydraulic winch closest to the top layer steel pipe supports; connect a lifting wire rope to the end of the lifting wire rope furthest from the hydraulic winch; assemble two sets of self-propelled hydraulic modular vehicles in the processing area; lay, level, and fix steel plates on each set of self-propelled hydraulic modular vehicles; first erect the bottom layer steel pipe supports on the steel plates, then erect the middle layer steel pipe supports on the bottom layer steel pipe supports, and erect one top layer steel pipe support on each middle layer steel pipe support to obtain the erected steel pipe supports; after pre-stressing the steel pipe supports by connecting counterweights with hoisting wire ropes, dismantle the top layer steel pipe supports;

[0014] S3: Drill holes at the predetermined unreinforced positions of the bridge abutment, the main arch cut of the arched sky bridge, and the cantilevered main arch ring; lay and tighten temporary slings at the bridge abutment and the cantilevered main arch ring; at the same time, thread the sling wire rope through the drilled hole in the main arch cut and fix it temporarily; stuff burlap sacks into the worn sling wire rope.

[0015] S4: Traffic on the closed construction section of the highway will be transported by using a self-propelled hydraulic modular vehicle to move the two steel pipe supports after the pre-stressing and removal of the top steel pipe supports to the area below the arch bridge to be demolished. The corresponding top steel pipe supports will be installed on the upper part of the middle steel pipe supports by a truck crane. The hoisting wire rope will be connected and tightened to the hoisting point wire rope at the main arch cutting body.

[0016] S5: Use a hydraulic wire saw to cut the main arch at the pre-cut position and use a small water pipe to wash away dust and cool it down. Simultaneously control the oil pressure of the hydraulic winch to ensure that the hoisting wire rope and the hoisting point wire rope are always taut.

[0017] S6: After the cutting is completed, control the hydraulic winch to synchronously lower the main arch cut body to the third layer of detachable flange connection steel support on the two middle layer steel pipe supports. Insert the limiting threaded steel bar into the remaining drill hole of the main arch cut body, and temporarily fix it to the top plate of the third layer of detachable flange connection steel support through the pad and the anti-reverse nut. The hoisting wire rope and the hoisting point wire rope are always taut. Tighten the wind cable wire rope between the side of the middle layer steel pipe support and the two ends of the main arch cut body to prevent the main arch cut body from moving in the longitudinal direction of the bridge during transportation.

[0018] S7: Open the movable guardrail of the median strip of the highway, transport the main arch cut body synchronously to the middle of the movable guardrail section, slowly move the self-propelled hydraulic modular vehicle, rotate the plane 90 degrees, and then slowly move the self-propelled hydraulic modular vehicle to one side of the driving lane, continue to transport the main arch cut body synchronously until it is moved to the storage site of the main arch cut body, remove the limiting threaded steel bars, lift the main arch cut body upward with the hydraulic winch, remove the third layer of detachable flange connection steel support, the second layer of detachable flange connection steel support and the first layer of detachable flange connection steel support, and gradually lower the main arch cut body into the thrust block groove of the storage site;

[0019] S8: Remove all steel wire ropes from the main arch cutting body, dismantle the steel pipe supports, and remove the self-propelled hydraulic modular vehicle group;

[0020] S9: With the assistance of truck cranes and transport vehicles, the cantilevered main arch rings on both sides were symmetrically dismantled using hydraulic wire saws and transported to the storage area. The openings of the median strip of the highway were closed, and the bridge demolition construction area and the road surface of the driving lane were cleared before the highway was reopened to traffic.

[0021] Preferably, step S1 further includes the following steps: Drafting a bridge demolition construction plan, determining the location of the movable guardrail section of the highway median opening, the steel pipe support processing site, and the storage site for the main arch cut body near the bridge site to be demolished, ensuring the site is open and flat, and avoiding height restriction frames; then, processing the protective net frame base according to the main arch shape, installing a hand-operated hoist safety protection device at a suitable position on the arch column, symmetrically installing the protective net frame base on the main arch, sequentially suspending the upper tie steel wire rope, the lower tie steel wire rope, and the lower flame-retardant dense mesh protective net, tightening the tie steel wire rope, symmetrically installing the cantilevered steel of the protective net frame, and installing protective wire mesh on the cantilevered steel;

[0022] When drilling above the driving lane, lay burlap bags to collect drilling debris on the lower layer of flame-retardant dense mesh protective netting to prevent drilling debris from falling onto the highway driving lane.

[0023] Preferably, in step S2, the top surface of the third layer of detachable flange-connected steel support is set to fit the bottom curve of the main arch cutting body.

[0024] Step S4 also includes the following steps: After the steel pipe support is erected, deformation observation points are set on the crossbeams of the steel pipe support, the third layer of detachable flange-connected steel supports, and the main arch cut body. During the bridge dismantling and transportation of the main arch cut body, the monitoring personnel regularly observe its deformation and dynamically adjust the position and status of the main arch cut body.

[0025] Preferably, step S5 further includes the following steps:

[0026] Hydraulic wire saws are installed near the cutting seams on both sides of the main arch. After the main arch cut is removed, the hydraulic wire saw continues to cut the remaining cantilevered main arch ring. When cutting the main arch cut, a rebar detector is used to mark the rebars and avoid the transverse stirrups. Before the cutting is about to be completed, the process is paused for five minutes to observe the deformation of the main arch cut and the dismantling and transportation device, check the stability of the self-propelled hydraulic modular vehicle and the steel pipe support, and calculate the oil pressure value of the hydraulic winch. After ensuring that everything is normal, the cutting continues until the cutting is completed.

[0027] Compared with the prior art, the advantages of this invention are:

[0028] (1) The device of this invention has high overall structural reliability, convenient material processing and equipment assembly, strong economic efficiency, and can be reused in existing highway arch bridge demolition projects of the same type, solving the problem that traditional bridge demolition mode cannot carry out batch and continuous construction. The self-propelled hydraulic modular vehicle in this invention is composed of a super-large chassis vehicle through series and parallel connection, and moves in a unified manner through the command of the power module, solving the problems of unstable installation of the bottom steel pipe support and inconsistent pace of vehicle transportation. In addition, the hydraulic pump stations of multiple hydraulic winches are operated through an electrical control cabinet, and the hydraulic pressure of the hydraulic winches is uniformly adjusted according to the stroke information, solving the problem of asynchronous lifting and lowering of hydraulic winches.

[0029] (2) In this invention, the main arch is equipped with perforated bottom steel wire rope lifting points and limiting threaded steel bars, which solves the problem of poor self-stability of the lifting points and easy slippage along the bridge direction during the dismantling and transportation of the main arch. At the same time, when the main arch is statically dismantled, the structural stress is clear, there are many abnormal deformation observation points, no sudden energy change, and no concrete flying stones or broken pieces fall. This solves the problem that collapse accidents or broken pieces often occur during traditional bridge dismantling construction.

[0030] (3) In this invention, the main arch cut body is transported by a hydraulic modular vehicle group. It rotates 90 degrees at the opening movable guardrail and moves to the same side of the driving lane, which solves the problem of turning and transporting ultra-long and ultra-high curved structures on existing highways. In addition, the main arch cut body has a complete structure and can provide a 1:1 physical model for the research team to conduct performance tests in an efficient, environmentally friendly, real and reliable manner, which solves the problem of lacking test data support when using the main arch cut body as a temporary construction bridge.

[0031] (4) In this invention, the safety net is composed of a protective net base, an upper layer of tie steel wire rope, a lower layer of tie steel wire rope, a lower layer of flame-retardant dense mesh protective net, cantilevered steel and protective wire mesh. The protective net base is fitted with the curve of the main arch and can be installed manually safely and efficiently with the assistance of a hand-operated hoist. There is no need to close existing traffic or drill holes and install reinforcement on site. The structure is simple and stable, and the components are lightweight and high-strength. This solves the problem of concrete fragments or tools falling onto the highway surface when drilling holes in the main arch. Attached Figure Description

[0032] Figure 1 This is a schematic elevation view of the integrated dismantling and transportation device of the present invention;

[0033] Figure 2 This is a cross-sectional schematic diagram of the integrated dismantling and transportation device of the present invention;

[0034] Figure 3 This is a schematic diagram of the elevation of the main arch cutting body lowered by the dismantling and transportation integrated device of the present invention;

[0035] Figure 4 This is a schematic diagram of the installation at the main arch cutting body of the protective mesh frame of the present invention;

[0036] Figure 5 This is a schematic diagram of the protective mesh frame of the present invention;

[0037] Figure 6 This is a schematic diagram of the horizontal rotation of the opening movable guardrail of the integrated dismantling and transportation device of the present invention.

[0038] The following are the labels in the diagram: 1. Protective net frame base; 2. Upper layer tie steel wire rope; 3. Lower layer tie steel wire rope; 4. Lower layer flame-retardant dense mesh protective net; 5. Outward-projecting steel section; 6. Protective wire mesh; 7. Bridge abutment; 8. Temporary sling; 9. Arch seat; 10. Wind cable steel wire rope; 11. Main arch cutting body; 12. Cantilevered main arch ring; 13. Self-propelled hydraulic modular vehicle unit; 14. Bottom layer steel pipe support; 15. Middle layer steel pipe support; 16. Top layer steel pipe support; 17. Hydraulic winch; 18. Third layer detachable flange connected steel support; 19. Second layer detachable flange connected steel support; 20. First layer detachable flange connected steel support; 21. Lifting steel wire rope; 22. Lifting point steel wire rope; 23. Limiting threaded steel bar; 24. Thrust groove; 25. Leveling steel plate. Detailed Implementation

[0039] Example 1:

[0040] Please see Figures 1-5 A dismantling and transportation device for the main arch of an existing highway arched overpass includes a self-propelled hydraulic modular vehicle 13, a bottom layer steel pipe support 14, a middle layer steel pipe support 15, a top layer steel pipe support 16, and a hydraulic winch with steel wire rope 17.

[0041] There are two top-level steel pipe supports 16. Each top-level steel pipe support 16 is connected to a middle-level steel pipe support 15 via a flange at its lower end. The middle-level steel pipe support 15 is connected to a bottom-level steel pipe support 14 via a flange at its end away from the top-level steel pipe support 16. The bottom-level steel pipe support 14 is connected to a leveling steel plate 25 at its end away from the middle-level steel pipe support 15. A self-propelled hydraulic modular vehicle group 13 is installed at the lower end of the leveling steel plate 25. The self-propelled hydraulic modular vehicle group 13 includes several self-propelled hydraulic modular vehicles. Several hydraulic winches 17 are connected to the end of the top-level steel pipe support 16 away from the middle-level steel pipe support 15.

[0042] Specifically, multiple self-propelled hydraulic modular vehicles in the self-propelled hydraulic modular vehicle group 13 are connected in series and parallel to form an ultra-large chassis vehicle based on the length of the open movable guardrail and the load-bearing capacity and installation requirements of the steel pipe support. They move in unison through the command of the power module. A 2cm thick leveling steel plate 25 is fixed on the self-propelled hydraulic modular vehicle group 13 to distribute the load-bearing capacity of the steel pipe support. Through a dense wheel matrix, the load-bearing capacity is distributed to individual wheels, reducing the concentrated load on the wheels. This solves the problems of unstable installation of the bottom steel pipe support 14 and inconsistent pace of vehicle transportation. At the same time, the hydraulic pump stations of multiple hydraulic winches 17 are operated through an electrical control cabinet. The hydraulic pressure of the hydraulic winches is adjusted uniformly according to the stroke information, solving the problem of asynchronous lifting and lowering of the hydraulic winches 17.

[0043] Specifically, the top-layer steel pipe support 16, the middle-layer steel pipe support 15, and the bottom-layer steel pipe support 14 are processed in sections at the processing yard using Q345 steel pipes and Q235 steel sections according to the height of the main arch above the road surface. After being connected by flanges, they are preloaded. The hydraulic winch 17 is pre-installed on the top-layer steel pipe support 16 and assembled together with the top-layer steel pipe support 16. In order to meet different height requirements, in addition to processing standard long sections, bottom adjustable sections of 0.5m and 1m in length can also be processed.

[0044] The hydraulic winch 17 is connected to a hoisting wire rope 21 at one end near the top steel pipe support 16, and a hoisting point wire rope 22 is connected to the other end of the hoisting wire rope 21 away from the hydraulic winch 17.

[0045] Specifically, perforated steel wire rope suspension points are set on the main arch, and burlap sacks are placed at the corners to reduce steel wire rope wear. During the bridge dismantling preparation period, holes are drilled in advance to insert steel wire ropes for the suspension points and temporarily fixed. To improve the drilling speed, a steel bar detector is used to mark the steel bars and avoid longitudinal and transverse steel bars.

[0046] The middle layer steel pipe support 15 is connected to a wind cable steel wire rope 10 on the side near the end of the main arch cutting body 11. Each middle layer steel pipe support 15 is connected to a third layer of detachable flange connection steel support 18. The center of the third layer of detachable flange connection steel support 18 is provided with a limiting threaded steel bar 23 that can limit the main arch cutting body 11. The end of the third layer of detachable flange connection steel support 18 away from the hydraulic winch 17 is provided with a second layer of detachable flange connection steel support 19.

[0047] Specifically, detachable flange connecting steel 18 and limiting threaded steel bars 23 that fit the bottom curve of the main arch are set between the middle layer steel pipe supports 15. Before transportation, the cutting body is temporarily fixed on the third layer detachable flange connecting steel support 18. The gaps are filled with burlap sacks to increase the friction of the contact surface and lower the center of gravity of the transportation device. Then, wind cable steel wire ropes 10 are set on the steel pipe supports on both sides to further constrain the movement of the main arch cutting body 11 in the bridge direction. The limiting threaded steel bars 23 pass through the drilled holes on the main arch and are temporarily fixed to the top plate of the third layer detachable flange connecting steel support 18 through the pad and the anti-reverse nut.

[0048] Both ends of the second-layer detachable flange-connected steel support 19 are connected to the middle-layer steel pipe support 15. A first-layer detachable flange-connected steel support 20 is provided on the side of the second-layer detachable flange-connected steel support 19 away from the third-layer detachable flange-connected steel support 18. Both ends of the first-layer detachable flange-connected steel support 20 are connected to the bottom-layer steel pipe support 14.

[0049] Specifically, to facilitate the rapid lowering of the main arch cut body 11 into the thrust groove 24 in the storage area, the third layer of detachable flange-connected steel support 18, the second layer of detachable flange-connected steel support 19, and the first layer of detachable flange-connected steel support 20 between the middle layer steel pipe support 15 and the bottom layer steel pipe support 14 are all set as detachable flange bolt-connected steel.

[0050] In addition, the main arch cutting body 11 at the suspension point steel wire rope 22 can be connected to the two ends of the transverse bridge direction of the protective net base 1. The protective net base 1 is connected to the upper layer tie steel wire rope 2 above the main arch cutting body, and the upper layer tie steel wire rope 2 is connected to the lower layer tie steel wire rope 3 below the main arch cutting body 11. The two ends of the protective net base 1 are bolted to the cantilever steel 5, and the outer side of the cantilever steel 5 is bolted to the protective wire mesh 6.

[0051] The lower layer tie wire rope 3 is provided with a lower layer flame-retardant dense mesh protective net 4 away from the upper layer tie wire rope 2, and the lower layer flame-retardant dense mesh protective net 4 is connected to both ends of the protective net base 1.

[0052] Specifically, the protective net base 1 is fitted with the curved shape of the main arch. With the assistance of a hand-operated hoist, it is fixed by a pull wire rope, and then the lower flame-retardant dense mesh protective net 4, the outward-projecting steel 5, and the protective wire mesh 6 are assembled and installed. This solves the problem of concrete fragments or tools falling onto the highway surface when drilling the main arch.

[0053] Example 2:

[0054] A method for dismantling and transporting the main arch of an existing highway arched overpass using the integrated dismantling and transport device described in Example 1 includes the following steps:

[0055] S1: Carry out preliminary preparations. Use a rebar detector to mark the longitudinal and transverse rebar positions of the bridge abutment 7, the main arch cut body 11 of the arched overpass, and the cantilevered main arch ring 12. Determine the cutting and drilling positions of the main arch of the arched overpass to be demolished. Formulate a bridge demolition construction plan. Determine the location of the movable guardrail section of the highway median opening, the steel pipe support processing and storage site for the main arch cut body 11 near the bridge site to be demolished. The site should be open and flat, and avoid height restriction frames. Then, process the protective net frame base 1 according to the main arch shape. Set up a hand-operated hoist safety protection device at a suitable position on the column on the arch. Symmetrically install the protective net frame base 1 on the main arch. Suspend the upper tie steel wire rope 2, the lower tie steel wire rope 3 and the lower flame-retardant dense mesh protective net 4 in sequence. Tighten the tie steel wire ropes. Symmetrically install the cantilevered steel 5 and protective wire mesh 6 of the protective net frame.

[0056] S2: Dismantle the bridge deck structure and arch columns of the arched overpass to be demolished; simultaneously fabricate the bottom layer steel pipe support 14, middle layer steel pipe support 15, and top layer steel pipe support 16 for erecting the steel pipe support system; install the third layer of detachable flange-connected steel support 18 and the second layer of detachable flange-connected steel support 19 from top to bottom on the middle layer steel pipe support 15, wherein the top surface of the third layer of detachable flange-connected steel support 18 is set to fit the curve of the bottom of the main arch cut body; install the first layer of detachable flange-connected steel support 20 on the bottom layer steel pipe support 14; pre-install a hydraulic winch 17 on the top layer steel pipe support 16, and place the hydraulic winch 17 near... One end of the top-level steel pipe support 16 is connected to the hoisting wire rope 21, and the end of the hoisting wire rope 21 away from the hydraulic winch 17 is connected to the hoisting point wire rope 22. Two self-propelled hydraulic modular vehicle groups 13 are assembled in the processing yard. A leveling steel plate 25 is laid and fixed on each self-propelled hydraulic modular vehicle group 13. A bottom-level steel pipe support 14 is first erected on the leveling steel plate 25, and then a middle-level steel pipe support 15 is erected on the steel pipe support 14. A top-level steel pipe support 16 is erected on each middle-level steel pipe support 15 to obtain the erected steel pipe support. After the pre-stressing of the steel pipe support is completed by connecting the counterweight through the hoisting wire rope 21, the top-level steel pipe support 16 is removed.

[0057] S3: Drill holes at the predetermined unreinforced positions of the bridge abutment 7, the main arch cut body 11 of the arched sky bridge, and the cantilevered main arch ring 12; install and tighten temporary slings at the bridge abutment 7 and the cantilevered main arch ring 12; at the same time, thread the sling wire rope 22 through the drilled hole in the main arch cut body 11 and fix it temporarily; stuff burlap sacks into the worn sling wire rope 22.

[0058] When drilling above the driving lane, a burlap bag for collecting drilling debris should be laid on the lower layer of flame-retardant dense mesh protective netting 4 to prevent drilling debris from falling onto the highway driving lane.

[0059] S4: Traffic on the closed construction section of the highway. The two steel pipe supports 16 after the pre-stressing were removed from the top layer steel pipe support 16 were moved to the underside of the arch bridge to be demolished by a self-propelled hydraulic modular vehicle 13. The corresponding top layer steel pipe support 16 was installed on the upper end of the middle layer steel pipe support 15 by a truck crane. The hoisting wire rope 21 was connected and tightened to the hoisting point wire rope 22 at the main arch cutting body 11.

[0060] After the steel pipe support is erected, deformation observation points are set on the crossbeams of the steel pipe support, the third layer of detachable flange-connected steel support 18, and the main arch cut body 11. During the bridge dismantling and transportation of the main arch cut body 11, the monitoring personnel regularly observe its deformation and dynamically adjust the position and status of the main arch cut body 11.

[0061] S5: The hydraulic wire saws are installed near the cutting seams on both sides of the main arch. The hydraulic wire saws are used to cut the main arch at the pre-cutting position and the small water pipes are used to wash away dust and cool it down. The oil pressure of the hydraulic winch 17 is controlled simultaneously to ensure that the hoisting wire rope 21 and the hoisting point wire rope 22 are always taut. After the main arch cut body 11 is transported away, the hydraulic wire saws continue to cut the remaining cantilevered main arch ring 12. When cutting the main arch, the rebar detector is used to mark the rebars and avoid the transverse stirrups. Before the cutting is about to be completed, the cutting is paused for five minutes to observe the deformation of the main arch cut body 11 and the dismantling and transportation device, check the stability of the self-propelled hydraulic modular vehicle group 13 and the steel pipe support, and calculate the oil pressure value of the hydraulic winch 17. After ensuring that everything is normal, the cutting continues until the cutting is completed.

[0062] S6: After the cutting is completed, control the hydraulic winch 17 to simultaneously lower the main arch cut body 11 to the third layer of detachable flange connecting steel support 18 on the two middle layer steel pipe supports 15. Insert the limiting threaded steel bar 23 into the remaining drill hole of the main arch cut body 11, and temporarily fix it to the top plate of the third layer of detachable flange connecting steel support 18 through the pad and the anti-reverse nut. The hoisting wire rope 21 and the hoisting point wire rope 22 are always taut. Tighten the wind cable wire rope 10 between the side of the middle layer steel pipe support 15 and the two ends of the main arch cut body 11 to prevent the main arch cut body 11 from moving along the bridge direction during transportation.

[0063] S7: As Figure 6As shown, the opening of the movable guardrail in the central median of the highway is opened, and the main arch cut body 11 is transported synchronously to the middle of the opening movable guardrail section. The self-propelled hydraulic modular vehicle 13 is slowly moved, rotated 90 degrees in plane, and then slowly moved to one side of the driving lane. The main arch cut body 11 is transported synchronously until it is moved to the storage site of the main arch cut body. The limiting threaded steel bar 23 is removed, and the hydraulic winch 17 lifts the main arch cut body 11 upward. The third layer of detachable flange connection steel support 18, the second layer of detachable flange connection steel support 19, and the first layer of detachable flange connection steel support 20 are removed. The main arch cut body 11 is gradually lowered into the thrust block groove 24 in the storage site to ensure that the main arch cut body 11 can reliably carry out performance tests.

[0064] S8: Remove all steel wire ropes from the main arch cutting body 11, dismantle the steel pipe support, and remove the self-propelled hydraulic modular vehicle 13.

[0065] S9: With the assistance of truck cranes and transport vehicles, and in conjunction with rebar detectors and hydraulic wire saws, the remaining cantilevered main arch ring 12 was dismantled and transported to the storage area. The opening of the movable guardrail in the central median of the highway was closed, and the bridge demolition construction area and driving lane surface were cleared before highway traffic was restored. At the same time, after the main arch cut body 11 was lowered into the thrust groove at the storage location, the steel pipe supports and related equipment were reused to reassemble the integrated dismantling and transportation device, in preparation for the demolition of the next arched overpass main arch.

[0066] 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 preferred examples and are not intended to limit 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 the present invention is defined by the appended claims and their equivalents.

Claims

1. A dismantling and transportation integrated device for the main arch of an existing highway arched overpass, characterized in that: The system includes a self-propelled hydraulic modular vehicle (13), a bottom steel pipe support (14), a middle steel pipe support (15), a top steel pipe support (16), and a hydraulic winch (17). There are two top steel pipe supports (16). The lower end of each top steel pipe support (16) is connected to a middle steel pipe support (15) via a flange. The middle steel pipe support (15) is connected to the bottom steel pipe support (14) via a flange at the end away from the top steel pipe support (16). The bottom steel pipe support (14) is connected to a horizontally set leveling steel plate (25) at the end away from the middle steel pipe support (15). The self-propelled hydraulic modular vehicle (13) is installed at the lower end of the leveling steel plate (25). The self-propelled hydraulic modular vehicle (13) includes several self-propelled hydraulic modular vehicles. The top steel pipe support (16) is connected to several hydraulic winches (17) at the end away from the middle steel pipe support (15). The hydraulic winch (17) is connected to a hoisting wire rope (21) at one end near the top steel pipe support (16), and a hoisting wire rope (22) is connected to the other end of the hoisting wire rope (21) away from the hydraulic winch (17). The middle layer steel pipe support (15) is connected to the wind cable steel wire rope (10) on the side near the end of the main arch cutting body (11). Each middle layer steel pipe support (15) is connected to a third layer of detachable flange connection steel support (18). The top surface of the third layer of detachable flange connection steel support (18) is fitted with the bottom curve of the main arch cutting body (11). The center of the third layer of detachable flange connection steel support (18) is provided with a limiting threaded steel bar (23) to limit the main arch cutting body (11). The end of the third layer of detachable flange connection steel support (18) away from the hydraulic winch (17) is provided with a second layer of detachable flange connection steel support (19). The suspended wire rope (22) is connected to the main arch cutting body (11) by a perforated rope bottom connection. The main arch cutting body (11) at the suspended wire rope (22) is connected to the protective net frame base (1) at both ends in the transverse direction. The protective net frame base (1) is connected to the upper layer tie wire rope (2) above the main arch cutting body (11). The upper layer tie wire rope (2) is connected to the lower layer tie wire rope (3) below the main arch cutting body (11). The protective net frame base (1) is connected to the two ends of the cantilevered steel section (5). The outer side of the cantilevered steel section (5) is connected to the protective wire mesh (6).

2. The integrated dismantling and transportation device for the main arch of an existing highway arched overpass according to claim 1, characterized in that: Both ends of the second-layer detachable flange connection steel support (19) are connected to the middle-layer steel pipe support (15). A first-layer detachable flange connection steel support (20) is provided on the side of the second-layer detachable flange connection steel support (19) away from the third-layer detachable flange connection steel support (18). Both ends of the first-layer detachable flange connection steel support (20) are connected to the bottom-layer steel pipe support (14).

3. The integrated dismantling and transportation device for the main arch of an existing highway arched overpass according to claim 1, characterized in that: The lower layer tie wire rope (3) is provided with a lower layer flame-retardant dense mesh protective net (4) away from the upper layer tie wire rope (2), and the lower layer flame-retardant dense mesh protective net (4) is connected to both ends of the protective net frame base (1).

4. A method for dismantling and transporting the main arch of an existing highway arched overpass, characterized in that: Includes the following steps: S1: Carry out preliminary preparations, use a steel bar detector to mark the longitudinal and transverse steel bar positions of the bridge abutment (7), the main arch cutting body (11) of the arched sky bridge and the cantilevered main arch ring (12), and determine the cutting position and drilling position of the main arch of the arched sky bridge to be demolished. S2: Dismantle the bridge deck structure and arch columns of the arched skybridge; simultaneously fabricate the bottom layer steel pipe support (14), middle layer steel pipe support (15) and top layer steel pipe support (16) for the erection of steel pipe supports. On the middle layer steel pipe support (15), install the third layer of detachable flange-connected steel support (18) and the second layer of detachable flange-connected steel support (19) from top to bottom. On the bottom layer steel pipe support (14), install the first layer of detachable flange-connected steel support (20). On the top layer steel pipe support (16), pre-install a hydraulic winch (17). Connect the hoisting wire rope (21) to the end of the hydraulic winch (17) near the top layer steel pipe support (16). The end of the hoisting wire rope (21) away from the hydraulic winch (17) is connected to the hoisting point wire rope (22). Two sets of self-propelled hydraulic modular vehicle sets (13) are assembled in the processing yard. A leveling steel plate (25) is laid and fixed on each set of self-propelled hydraulic modular vehicle sets (13). A bottom layer steel pipe support (14) is first erected on the leveling steel plate (25), and then a middle layer steel pipe support (15) is erected on the bottom layer steel pipe support (14). A top layer steel pipe support (16) is erected on the middle layer steel pipe support (15) to obtain the erected steel pipe support. After the steel pipe support is pre-stressed by connecting the counterweight through the hoisting wire rope (21), the top layer steel pipe support (16) is removed. S3: Drill holes at the predetermined unreinforced positions of the bridge abutment (7), the main arch cut body (11) of the arched sky bridge and the cantilevered main arch ring (12), and lay and tighten temporary slings (8) in the bridge abutment (7) and the cantilevered main arch ring (12); at the same time, thread the sling wire rope (22) through the drilled hole in the main arch cut body (11) and fix it temporarily, and stuff burlap sacks at the worn sling wire rope (22); S4: Close the highway traffic in the construction section. After the two steel pipe supports (16) of the top layer steel pipe support were removed after the pre-stressing, they were moved to the bottom of the arch bridge to be demolished by a self-propelled hydraulic modular vehicle group (13). The corresponding top layer steel pipe support (16) was installed on the upper end of the middle layer steel pipe support (15) by a truck crane. The hoisting wire rope (21) was connected and tightened to the hoisting point wire rope (22) at the main arch cutting body (11). S5: Use a hydraulic wire saw to cut the main arch at the pre-cut position of the main arch and use a small water pipe to wash away dust and cool down. Simultaneously control the oil pressure of the hydraulic winch (17) to ensure that the hoisting wire rope (21) and the hoisting point wire rope (22) are always taut. S6: After the cutting is completed, control the hydraulic winch (17) to lower the main arch cut body (11) to the third layer of detachable flange connection steel support (18) on the two middle layer steel pipe supports (15). Insert the limiting threaded steel bar (23) into the remaining drill hole of the main arch cut body (11), and temporarily fix it to the top plate of the third layer of detachable flange connection steel support (18) through the pad and the anti-reverse nut. The hoisting wire rope (21) and the hoisting point wire rope (22) are always taut. Tighten the wind cable wire rope (10) between the side of the middle layer steel pipe support (15) and the two ends of the main arch cut body (11) to prevent the main arch cut body (11) from moving along the bridge direction during transportation. S7: Open the movable guardrail of the central divider of the highway, transport the main arch cut body (11) synchronously to the middle of the movable guardrail section, slowly move the self-propelled hydraulic modular vehicle (13), rotate the plane 90 degrees, and then slowly move the self-propelled hydraulic modular vehicle (13) to one side of the driving lane, continue to transport the main arch cut body (11) synchronously until it is moved to the storage site of the main arch cut body, remove the limiting threaded steel bar (23), and use the hydraulic winch (17) to lift the main arch cut body (11) upward. Remove the third layer of detachable flange connection steel support (18), the second layer of detachable flange connection steel support (19) and the first layer of detachable flange connection steel support (20), and gradually lower the main arch cut body (11) into the thrust block groove (24) of the storage site. S8: Remove all kinds of steel wire ropes on the main arch cutting body (11), remove the steel pipe support, and move away the self-propelled hydraulic modular vehicle group (13). S9: With the assistance of a truck crane and a transport vehicle, the cantilevered main arch rings (12) on both sides were symmetrically removed using a hydraulic wire saw and transported to the storage area. The opening of the median strip of the highway was closed, and the bridge demolition construction area and the road surface of the driving lane were cleaned up before the highway was restored to traffic.

5. A method for dismantling and transporting the main arch of an existing highway arched overpass according to claim 4, characterized in that: Step S1 also includes the following steps: formulate a bridge demolition construction plan, determine the location of the opening of the highway median barrier section, the processing and storage of the steel pipe support and the main arch cutting body (11) near the bridge site to be demolished, the site is open and flat, and avoids the height restriction frame, then according to the main arch shape, process the protective net frame base (1), set the hand chain hoist safety protection device at the appropriate position of the column on the arch, symmetrically install the protective net frame base (1) on the main arch, and sequentially suspend the upper tie steel wire rope (2), the lower tie steel wire rope (3) and the lower flame-retardant dense mesh protective net (4), tighten the tie steel wire rope, symmetrically install the cantilevered steel of the protective net frame (5), and install the protective wire mesh (6) on the cantilevered steel (5). When drilling above the driving lane, a burlap bag for collecting drilling debris is laid on the lower layer of flame-retardant dense mesh protective net (4) to prevent drilling debris from falling onto the highway driving lane.

6. The method for dismantling and transporting the main arch of an existing highway arched overpass according to claim 4, characterized in that: In step S2, the top surface of the third layer of detachable flange-connected steel support (18) is fitted with the bottom curve of the main arch cut body (11); Step S4 also includes the following steps: After the steel pipe support is erected, deformation observation points are set on the crossbeams of the steel pipe support, the third layer of detachable flange connection steel support (18), and the main arch cut body (11). During the bridge dismantling and transportation of the main arch cut body (11), the monitoring personnel regularly observe its deformation and dynamically adjust the position of the main arch cut body (11).

7. A method for dismantling and transporting the main arch of an existing highway arched overpass according to claim 4, characterized in that: Step S5 also includes the following steps: Hydraulic wire saws are installed near the cutting seams on both sides of the main arch. After the main arch cutting body (11) is transported away, the hydraulic wire saw continues to cut the remaining cantilevered main arch ring (12). When cutting the main arch cutting body (11), a rebar detector is used to mark the rebars and avoid the transverse stirrups. Before the cutting is about to be completed, pause for five minutes to observe the deformation of the main arch cutting body (11) and the dismantling and transportation device, check the stability of the self-propelled hydraulic modular vehicle group (13) and the steel pipe support, and calculate the oil pressure value of the hydraulic winch (17). After ensuring that everything is normal, continue cutting until the cutting is completed.

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