An arch-mounted hoisting system for installing large-tonnage components of a variable cross-section steel arch bridge

Abstract

This invention relates to an arch-mounted hoisting system for installing large-tonnage components of variable cross-section steel arch bridges, comprising a track system, a crane system, and a traction system. The track system includes multiple track seats welded to the arch ribs, with track beams welded longitudinally along the arch ribs on each track seat. The crane system includes four arch-mounted cranes, two on each arch rib. Each arch-mounted crane is equipped with a lifting winch and a balancing winch. Two arch-mounted cranes on the same arch rib are connected by a connecting rope, and opposite arch-mounted cranes on two arch ribs are connected by an adjustable-pitch steel wire rope, with both ends of the adjustable-pitch steel wire rope connected to the balancing winches on the two arch-mounted cranes. The traction system includes multiple traction winches located at the bridgeheads, which pull the arch-mounted cranes along the arch ribs via traction cables. This invention is applicable to arch bridges with constant and variable cross-sections, as well as various types of arch ribs such as steel box arches, steel pipe arches, and triangular cross-section arches.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology and relates to the construction of steel arch bridges, specifically to an arch-mounted hoisting system for installing large-tonnage components of variable cross-section steel arch bridges. Background Technology

[0002] When constructing steel arch bridges using the arch-beam-then-beam method, the suspenders, steel beams, and other components are typically installed sequentially after the arch ribs are closed. Currently, cable cranes are commonly used to lift these components. While cable cranes have a wide range of applications, they require robust cable towers and anchoring systems, resulting in significant investment in temporary facilities and high costs. Furthermore, cable cranes have limited lifting capacity; when lifting steel box girders, they can only break them down into smaller segments, which are then assembled after being lifted into place, leading to low construction efficiency.

[0003] For example, patent CN115110420B discloses a hoisting construction equipment for the arch ribs of an arch bridge. A load-bearing vehicle is set on each of the two arch ribs, and a winch is set on each of the two load-bearing vehicles. The two load-bearing vehicles are connected by a truss beam. The load-bearing vehicles lift the components to be installed by the winch and are pulled along the track laid on the arch rib by the ground traction system. The aforementioned arch-mounted hoisting equipment can fully utilize the support and load-bearing function of the installed arch ribs, resulting in lower construction costs. However, it is subject to significant limitations due to the bridge type and arch rib shape. Since the spacing between the load-bearing vehicles on the two arch ribs is fixed, it is only suitable for parallel arch rib arch bridges. For variable cross-section arch bridges such as basket arches and butterfly arches, where the spacing between the two arch ribs varies, the aforementioned equipment is not applicable. Furthermore, because the load-bearing vehicles must adapt to the arch shape of the arch ribs, the front and rear wheel track and the width of the load-bearing vehicles are also relatively small. Therefore, only one winch can be installed at each end of each load-bearing vehicle, resulting in limited lifting capacity and making it unsuitable for lifting large-tonnage components. In addition, the load-bearing vehicle tracks of the aforementioned equipment are laid directly on the arch ribs, so it is only suitable for steel box arches with a flat top surface and is not applicable to steel pipe arches or triangular cross-section arch ribs. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems of existing arch-mounted cranes by providing an arch-mounted hoisting system for installing large-tonnage components of variable cross-section steel arch bridges, thereby expanding the applicability of arch-mounted cranes.

[0005] The technical solution of the present invention is as follows:

[0006] An arch-mounted hoisting system for installing large-tonnage components of a long-span variable cross-section steel arch bridge is characterized by comprising a track system, a crane system, and a traction system.

[0007] The track system includes multiple track seats, which are set at regular intervals along the longitudinal direction of the two arch ribs of the arch bridge. Each track seat is welded to the top of the arch rib, and at least two track beams are welded between the tops of each track seat on each arch rib along the longitudinal direction of the arch rib.

[0008] The crane system includes four arch-mounted cranes. Each arch-mounted crane includes a base with a truss welded to it. Two traveling wheels are respectively installed on the bottom surface of the base corresponding to each track beam on one arch rib. A lifting winch and a balancing winch are mounted on the truss. A first fixed pulley is located at one end of the truss, and a second fixed pulley is located at the other end. Two of the four arch-mounted cranes are installed on each arch rib. The traveling wheels at the bottom of each arch-mounted crane are supported on the track beams and can travel along the track beams. The first fixed pulley on each arch-mounted crane is located on the outside of the arch rib, and the second fixed pulley is located on the outside of the arch rib. Inside the ribs, there is a certain distance between the two arch cranes on each arch rib. The two arch cranes on the same arch rib are connected by a connecting rope. The two arch cranes on each arch rib are transversely opposite to the two arch cranes on another arch rib. The second pulleys of the two transversely opposite arch cranes on the two arch ribs are wound with adjustable steel wire ropes. The two ends of the adjustable steel wire ropes are respectively connected to the balance winches on the two arch cranes. The first fixed pulley of each arch crane is wound with a lifting steel wire rope. One end of the lifting steel wire rope is connected to the lifting winch, and the other end hangs down on the outside of the arch rib and is connected to a hook.

[0009] The traction system includes multiple traction winches and multiple steering wheels. One to two traction winches are installed at each end of the bridge corresponding to each arch crane. Multiple steering wheels are welded at intervals along the longitudinal direction of the arch rib to the rail base. The traction cable of each traction winch passes around the steering wheel along the longitudinal direction of the arch rib and connects to its corresponding arch crane.

[0010] The spacing between the arch cranes installed on the two arch ribs in this invention can be continuously adjusted according to the change in the arch rib spacing, making it applicable to the construction of arch bridges with equal and variable cross sections. The track system of this invention has its track base welded to the arch rib, and the track beam laid on the track base. The track base provides a stable welding and support surface for the track beam, and it is applicable to various arch rib types such as steel box arches, steel pipe arches, and triangular cross section arches. This invention has two arch cranes installed on each arch rib, with a certain distance between the two cranes, which facilitates the lifting of large-segment components. It has strong lifting capacity, wide applicability, and can fully utilize the technical advantages of arch cranes in arch bridge construction, saving construction costs. Attached Figure Description

[0011] Figure 1 This is a transverse elevation view of the present invention;

[0012] Figure 2 This is a side view along the bridge and a schematic diagram of its usage.

[0013] Figure 3 This is a side view of the arch-mounted crane of the present invention along the bridge direction;

[0014] Figure 4 This is a schematic diagram showing the connection status of two arch cranes on the same arch rib.

[0015] Figure 5 It is a schematic diagram showing the connection between two opposing arch cranes on the two arch ribs via adjustable steel wire ropes.

[0016] Figure 6 This is a schematic diagram of the structure of a track seat according to the present invention. Detailed Implementation

[0017] like Figures 1 to 5 As shown, the present invention includes a track system, a crane system, and a traction system;

[0018] The track system includes multiple track seats 1, which are set at regular intervals along the longitudinal direction of the two arch ribs 100 of the arch bridge. Each track seat 1 is welded to the top of the arch rib 100, and at least two track beams 2 are welded between the tops of each track seat 1 on each arch rib along the longitudinal direction of the arch rib.

[0019] The function of the track seat 1 is to provide a stable welding and support surface for the track beam, adapting to arch ribs of various cross-sections. In a specific implementation of this invention, to ensure the stability of the track seat on the arch rib, a plane for welding to the track beam can be provided at the top of the track seat according to the cross-sectional shape of the arch rib, and a groove matching the top of the arch rib can be provided at the bottom of the track seat. During installation, the groove at the bottom of the track seat is fastened to the top of the arch rib and welded to it. Figures 1 to 5 In the embodiment shown, the cross-section of the arch rib is triangular, and the structure of the track seat is as follows. Figure 6 As shown, a V-shaped groove 11 that matches the top of the triangular arch rib is provided at the bottom of the track seat 1; similarly, for steel pipe arch ribs, an arc-shaped groove that matches the top of the steel pipe arch can be provided at the bottom of the track seat, and for box arches, a rectangular groove can be provided at the bottom of the track seat.

[0020] The crane system includes four arch-mounted cranes 3. Each arch-mounted crane 3 includes a base 31, on which a truss 32 is welded. Two traveling wheels 33 are respectively installed on the bottom surface of the base 31 corresponding to each track beam on one arch rib. A lifting winch 34 and a balancing winch 35 are installed on the truss 32. A first fixed pulley 36 is provided at one end of the truss, and a second fixed pulley 37 is provided at the other end. Two of the four arch-mounted cranes are installed on each arch rib. The traveling wheels 33 at the bottom of each arch-mounted crane 3 are supported on the track beam 2 and can travel along the track beam. The first fixed pulley 36 on each arch-mounted crane is located on the outer side of the arch rib 100. The second fixed pulley 37 is located inside the arch rib 100. There is a certain distance between the two arch cranes on each arch rib. The two arch cranes on the same arch rib are connected by a connecting rope 4. The two arch cranes on each arch rib are respectively opposite to the two arch cranes on another arch rib in the transverse direction. The second pulleys of the two arch cranes opposite each other in the transverse direction on the two arch ribs are wound with adjustable steel wire ropes 5. The two ends of the adjustable steel wire ropes are respectively connected to the balance winches on the two arch cranes. The first fixed pulley of each arch crane is wound with a lifting steel wire rope 38. One end of the lifting steel wire rope 38 is connected to the lifting winch 34, and the other end hangs down on the outside of the arch rib 100 and is connected to the hook.

[0021] The traction system includes multiple traction winches 6 and multiple steering wheels 7. One to two traction winches 6 are installed at each end of the bridge corresponding to each arch crane. Multiple steering wheels 7 are welded at intervals along the longitudinal direction of the arch rib to the track seat 1. The traction cable 61 of each traction winch 6 passes around the steering wheel 7 along the longitudinal direction of the arch rib and connects to its corresponding arch crane 3.

[0022] In a specific implementation of this invention, to facilitate the connection of two arch cranes on the same arch rib via connecting ropes, and the connection of the traction cable of the traction winch to the arch crane, one to two traction pulleys 39 can be respectively provided on both sides of the base 31 of each arch crane 3 facing both ends of the bridge. Each traction pulley 39 is rotatably connected to the base 31 via a pin. The two ends of the connecting rope 4 between the two arch cranes on each arch rib are respectively wound around the traction pulleys 39 on the opposite sides of the two arch cranes. An anchor seat 8 is fixedly installed at both ends of the bridge corresponding to each traction winch. The traction cable 61 connecting the traction winch and the arch crane passes around the traction pulley 39 on the side of the arch crane facing the traction winch and then turns back and connects to the anchor seat 8.

[0023] The specific construction method of this invention is as follows:

[0024] Before the segmented installation of the arch rib, multiple track seats are welded at equal intervals on each arch rib segment, and track beams are welded between the top surfaces of the track seats. The track beams adopt a segmental structure, with each track beam segment welded between the tops of two adjacent track seats. The spacing between the track seats is appropriately set so that the multiple track beam segments form an arc that is basically consistent with the arch rib's shape by substituting straight lines for curves. After the segmented installation of the arch rib is completed, the track system is also installed, and the arch-mounted crane is then installed.

[0025] First, set up traction winches and anchorages at both ends of the bridge. Then, hoist two arch cranes on each arch rib and temporarily fix them with limiting devices. Set up connecting ropes between the two arch cranes on the same arch rib. Set up adjustable wire ropes between each pair of arch cranes on the two arch ribs and connect the two ends of the adjustable wire ropes to the balance winches on the two cranes respectively. Then, connect the traction cables of the traction winches at both ends of the bridge to each arch crane, release the temporary limiting devices, and complete the installation of the arch hoisting system.

[0026] As shown in Figure 2, Figure 1 As shown, the transport ship 200 transports components such as booms and steel beams to the area below the component installation position, where they are lifted using the arch-mounted lifting system. The traction winch 6 is started, with one end of the winch winding up the cable and the other end releasing it, pulling the arch-mounted crane 3 along the arch rib 100. During this movement, the balance winch loosens the adjusting wire rope 5, allowing the arch-mounted cranes on the two arch ribs to automatically adapt to the distance between them. Once above the lifting position, the balance winch tightens the adjusting wire rope 5, and the lifting winch lowers the lifting wire rope 38, lifting the component 300 from the ship to the installation position for installation. After one component is installed, the above process is repeated to pull the arch-mounted crane to the next lifting position. First, the booms are lifted; after all booms are installed, the steel beams are lifted. After all components are installed, the arch-mounted lifting system is dismantled, completing the arch bridge construction.

Claims

1. A variable cross-section steel arch bridge large tonnage component installation arch hoisting system, characterized in that: The system comprises a track system, a crane system and a traction system. The track system comprises a plurality of track seats, each of which is arranged on two arch ribs of the arch bridge at a certain interval along the longitudinal direction of the arch rib, and each of which is welded to the top of the arch rib. The crane system comprises four arch cranes, each of which comprises a base and a truss welded to the base. The traction system comprises a plurality of traction winches and a plurality of steering wheels.

2. The variable cross-section steel arch bridge large tonnage member installation arch hoisting system according to claim 1, characterized in that: The track seat is provided with a flat surface welded to the track beam at the top thereof, and a notch matching the top of the arch rib at the bottom thereof.

3. The variable cross-section steel arch bridge large tonnage member installation arch hoisting system according to claim 1, characterized in that: The base of each arch crane is provided with one or two traction sheaves on each side thereof, and each traction sheave is rotatably connected to the base by a pin shaft. The connecting ropes between the two arch cranes on each arch rib are wound around the traction sheaves on the opposite sides of the two arch cranes. Each traction winch is fixed to an anchor seat corresponding to the traction winch at each end of the bridge. The traction cable connected to the arch crane is folded back after passing through the traction sheave on the side of the arch crane facing the traction winch, and is connected to the anchor seat.

Images