On-arch hoisting system for mounting large-tonnage component of variable-cross-section steel arch bridge

Abstract

The invention relates to an on-arch hoisting system for mounting a large-tonnage component of a variable-cross-section steel arch bridge. The on-arch hoisting system comprises a rail system, a crane system and a traction system, the track system comprises a plurality of track seats welded on the arch ribs, and track beams are welded on the track seats along the longitudinal direction of the arch ribs; the crane system comprises four on-arch cranes, each arch rib is provided with two on-arch cranes, each on-arch crane is provided with a hoisting winch and a balancing winch, the two on-arch cranes on the same arch rib are connected through a connecting rope, and the opposite on-arch cranes on the two arch ribs are connected through a distance adjusting steel wire rope. Two ends of the distance adjusting steel wire rope are respectively connected with the balance winches on the two arch cranes; the traction system comprises a plurality of traction winches arranged at the bridge head, and the traction winches pull the arch crane to walk on the arch rib through traction cables. The method can be suitable for arch bridges with equal variable cross sections and variable cross sections, and various types of arch ribs such as steel box arches, steel pipe arches and triangular cross section arches.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, relates to a steel arch bridge construction, and specifically relates to an arch hoisting system for installing large-tonnage components of a variable-section steel arch bridge. Background Art

[0002] When constructing a steel arch bridge using the arch-first-beam-later method, usually after the arch ribs are closed, the hangers, steel beams and other components are installed in sequence. At present, cable cranes are mostly used to hoist the above components during construction. The cable hoisting method has a wide range of applications, but it requires the installation of powerful cable towers and anchoring systems, large temporary facilities, and high costs. In addition, the cable hoist has limited lifting capacity. When hoisting steel box girders, they can only be decomposed into multiple smaller segments, which are then spliced ​​after being hoisted in place, resulting in low construction efficiency.

[0003] For example, patent CN115110420B discloses a kind of hoisting construction equipment above the arch rib of an arch bridge. A load-bearing vehicle is respectively arranged on two arch ribs, and winches are respectively arranged on the two load-bearing vehicles. The two load-bearing vehicles are connected by a truss beam. The load-bearing vehicle lifts the components to be installed by the winch, and the load-bearing vehicle is towed by a ground traction system to move along the track laid on the arch rib. The above-mentioned arch hoisting equipment can make full use of the support and load-bearing function of the installed arch ribs, and the construction cost is low, but it is greatly restricted by the bridge type and arch rib type. Since the distance between the load-bearing vehicles on the two arch ribs is fixed, it is only suitable for parallel arch rib arch bridges. For variable-section arch bridges such as basket arches and butterfly arches, the distance between the two arch ribs varies, and the above-mentioned equipment is not applicable; moreover, since the load-bearing vehicle must adapt to the arch line type of the arch rib, the front and rear wheelbase and the width of the load-bearing vehicle are also small, so only one winch can be installed at each end of each load-bearing vehicle, resulting in limited lifting capacity, and it is not suitable for lifting large-tonnage components; in addition, the load-bearing vehicle track of the above-mentioned equipment is directly laid on the arch rib, so it is only suitable for steel box arches with a flat top surface, and is not applicable to steel pipe arches and triangular-section arch ribs. Summary of the invention

[0004] The purpose of the present invention is to provide an arch hoisting system for installing large-tonnage components of variable-section steel arch bridges in order to address the above-mentioned problems of existing arch hoists and expand the scope of application of arch hoists.

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

[0006] An arch hoisting system for installing large-tonnage components of a large-span variable-section steel arch bridge, characterized in that it includes a track system, a crane system and a traction system;

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

[0008] The crane system includes 4 arch cranes, each of which includes a base with a truss welded on the base. Two running wheels are respectively arranged on the bottom surface of the base corresponding to each track beam on an arch rib. A lifting winch and a balancing winch are arranged on the truss. A first fixed pulley is arranged at one end of the truss, and a second fixed pulley is arranged at the other end. Two of the 4 arch cranes are arranged on each arch rib, and the running wheels at the bottom of each arch crane are respectively supported on the track beam and can travel along the track beam. The first fixed pulley on each arch crane is located on the outside of the arch rib, and the second fixed pulley is located on the arch. On the inner side of the rib, there is a certain distance between the two arch hoists on each arch rib, and the two arch hoists on the same arch rib are connected by a connecting rope. The two arch hoists on each arch rib are respectively opposite to the two arch hoists on another arch rib in the transverse direction. The second pulleys of the two arch hoists opposite to each other in the transverse direction on the two arch ribs are wound with a pitch-adjustable wire rope, and the two ends of the pitch-adjustable wire rope are respectively connected to the balancing winches on the two arch hoists. A lifting wire rope is wound around the first fixed pulley of each arch hoist, and one end of the lifting wire rope is connected to the lifting winch, and the other end hangs down on the outer side 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 respectively arranged at both ends of the bridge corresponding to each arch hoist. Multiple steering wheels are welded on the track seat at intervals along the longitudinal direction of the arch rib. The traction rope of each traction winch passes over the steering wheel along the longitudinal direction of the arch rib and is connected to the corresponding arch hoist.

[0010] The spacing between the arch hoists arranged on the two arch ribs of the present invention can be continuously adjusted as the spacing between the arch ribs changes, and can be applicable to the construction of arch bridges with uniform cross-sections and variable cross-sections. The track seat of the track system of the present invention is welded on the arch ribs, and the track beam is laid on the track seat. The track seat provides a stable welding and supporting surface for the track beam, and can be applicable to various arch rib types such as steel box arches, steel pipe arches, and triangular cross-section arches. Two arch hoists are arranged on each arch rib of the present invention, and there is a certain spacing between the two hoists, which is convenient for lifting large segment components, has strong lifting capacity, and has a wide range of applications. The technical advantages of the arch hoist can be fully utilized in the construction of arch bridges, saving construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0012] Figure 2 It is a side view along the bridge and a schematic diagram of the use state of the present invention;

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

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

[0015] Figure 5 It is a schematic diagram of the state in which two arch rib upper cross bridges facing each other are connected by two arch upper cranes through adjustable distance wire ropes;

[0016] Figure 6 It is a structural schematic diagram of a track seat of the present invention. DETAILED DESCRIPTION

[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 a plurality of track seats 1, which are arranged on two arch ribs 100 of the arch bridge at regular intervals along the longitudinal direction of the arch ribs. 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 the track seats 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 to adapt to arch ribs of various cross-sections. In the specific implementation of the present invention, in order to ensure the stability of the track seat on the arch rib, a plane for welding with the track beam can be set at the top of the track seat according to the cross-sectional shape of the arch rib, and a notch that matches the top of the arch rib can be set at the bottom of the track seat. When the track seat is installed, the notch at the bottom of the track seat is buckled on the top of the arch rib and welded to the arch rib. Figures 1 to 5 In the embodiment shown, the cross section of the arch rib is triangular, and the structure of the track seat used is as follows: Figure 6 As shown, a V-shaped notch 11 is provided at the bottom of the track seat 1 to match the top of the triangular arch rib; similarly, for the steel tube arch rib, a circular arc-shaped notch can be provided at the bottom of the track seat to match the top of the steel tube arch, and for the box-type arch, a rectangular notch can be provided at the bottom of the track seat.

[0020] The crane system includes 4 arch cranes 3, each arch crane 3 includes a base 31, a truss 32 is welded on the base 31, two running wheels 33 are respectively arranged on the bottom surface of the base 31 corresponding to each track beam on an arch rib, a lifting winch 34 and a balancing winch 35 are arranged on the truss 32, a first fixed pulley 36 is arranged at one end of the truss, and a second fixed pulley 37 is arranged at the other end; 2 of the 4 arch cranes are arranged on each arch rib, and the running wheels 33 at the bottom of each arch crane 3 are respectively supported on the track beam 2 and can travel along the track beam, and the first fixed pulley 36 on each arch crane is located on the outside of the arch rib 100, The second fixed pulley 37 is located on the inner side of the arch rib 100. There is a certain distance between the two arch hoists on each arch rib. The two arch hoists on the same arch rib are connected by a connecting rope 4. The two arch hoists on each arch rib are respectively opposite to the two arch hoists on another arch rib in transverse direction. A pitch-adjustable steel wire rope 5 is wound around the second pulleys of the two arch hoists opposite to each other in transverse direction on the two arch ribs. Both ends of the pitch-adjustable steel wire rope are respectively connected to the balancing winches on the two arch hoists. A lifting steel wire rope 38 is wound around the first fixed pulley of each arch hoist. 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 a hook.

[0021] The traction system includes multiple traction winches 6 and multiple steering wheels 7. The traction winches 6 are provided with 1 to 2 at both ends of the bridge corresponding to each arch hoist. The multiple steering wheels 7 are welded on the track seat 1 at intervals along the longitudinal direction of the arch rib. The traction rope 61 of each traction winch 6 passes over the steering wheel 7 along the longitudinal direction of the arch rib and is connected to the corresponding arch hoist 3.

[0022] When the present invention is implemented, in order to facilitate the connection of two arch hoists on the same arch rib through a connecting rope, and the connection of the traction rope of the traction winch with the arch hoist, 1 to 2 traction pulleys 39 can be respectively provided on both sides of the base 31 of each arch hoist 3 facing the two ends of the bridge, and each traction pulley 39 is rotatably connected to the base 31 through a pin; the two ends of the connecting rope 4 between the two arch hoists on each arch rib are respectively wound around the traction pulleys 39 on the opposite sides of the two arch hoists; an anchor seat 8 is fixedly provided at both ends of the bridge corresponding to each traction winch, and the traction rope 61 connecting the traction winch and the arch hoist passes over the traction pulley 39 on the side of the arch hoist facing the traction winch and then returns and is connected to the anchor seat 8.

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

[0024] Before the segmental 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 beam adopts a segmental structure, and each track beam segment is welded between the tops of two adjacent track seats. The spacing of the track seats is appropriately set so that multiple track beam segments form an arc that is basically consistent with the arch rib line shape in a straight-instead-curved manner. After the segmental installation of the arch rib is completed, the track system is also installed, and the arch hoist is installed.

[0025] First, traction winches and anchor seats are laid out at both ends of the bridge. Then, two arch hoists are hoisted on each arch rib and temporarily fixed by limit devices. A connecting rope is set between the two arch hoists on the same arch rib. A pitch-adjustable steel wire rope is set between every two arch hoists opposite to each other on the two arch ribs, and the two ends of the pitch-adjustable steel wire rope are respectively connected to the balancing winches on the two hoists. Then, the traction ropes of the traction winches at both ends of the bridge are respectively connected to each arch hoist, the temporary limit is released, and the installation of the arch hoisting system is completed.

[0026] As shown in Figure 2, Figure 1 As shown in , the transport ship 200 transports the components such as the boom and steel beam to the bottom of the component installation position and uses the arch hoisting system to hoist them. Start the traction winch 6, the traction winch at one end of the bridge collects the rope and the other end releases the rope, and the traction arch hoist 3 moves along the arch rib 100. During the walking process, the balance winch loosens the adjustable wire rope 5 so that the arch hoists on the two arch ribs can automatically adapt to the distance between the two arch ribs; when it moves above the lifting position, the balance winch tightens the adjustable wire rope 5, and the lifting winch is started to lower the lifting wire rope 38, and the component 300 on the ship is lifted to the installation position and installed. After one component is installed, repeat the above process to tow the arch hoist to the next lifting position. First, hoist the boom. After all the booms are hoisted, hoist the steel beam. After all the components are hoisted, dismantle the arch hoisting system to complete the arch bridge construction.

Claims

1. An arch hoisting system for installing large-tonnage components of a variable-section steel arch bridge, characterized in that: Including track system, crane system and traction system; The track system includes a plurality of track seats, which are arranged on two arch ribs of the arch bridge at regular intervals along the longitudinal direction of the arch ribs, each track seat is welded to the top of the arch rib, and at least two track beams are welded between the tops of the track seats on each arch rib along the longitudinal direction of the arch rib; The crane system includes 4 arch cranes, each of which includes a base with a truss welded on the base. Two running wheels are respectively arranged on the bottom surface of the base corresponding to each track beam on an arch rib. A lifting winch and a balancing winch are arranged on the truss. A first fixed pulley is arranged at one end of the truss, and a second fixed pulley is arranged at the other end. Two of the 4 arch cranes are arranged on each arch rib, and the running wheels at the bottom of each arch crane are respectively supported on the track beam and can travel along the track beam. The first fixed pulley on each arch crane is located on the outside of the arch rib, and the second fixed pulley is located on the arch. On the inner side of the rib, there is a certain distance between the two arch hoists on each arch rib, and the two arch hoists on the same arch rib are connected by a connecting rope. The two arch hoists on each arch rib are respectively opposite to the two arch hoists on another arch rib in the transverse direction. The second pulleys of the two arch hoists opposite to each other in the transverse direction on the two arch ribs are wound with a pitch-adjustable wire rope, and the two ends of the pitch-adjustable wire rope are respectively connected to the balancing winches on the two arch hoists. A lifting wire rope is wound around the first fixed pulley of each arch hoist, and one end of the lifting wire rope is connected to the lifting winch, and the other end hangs down on the outer side of the arch rib and is connected to a hook; The traction system includes multiple traction winches and multiple steering wheels. One to two traction winches are respectively arranged at both ends of the bridge corresponding to each arch hoist. Multiple steering wheels are welded on the track seat at intervals along the longitudinal direction of the arch rib. The traction rope of each traction winch passes over the steering wheel along the longitudinal direction of the arch rib and is connected to the corresponding arch hoist.

2. The arch hoisting system for installing large-tonnage components of a variable-section steel arch bridge according to claim 1 is characterized in that: The top of the track seat is provided with a plane welded with the track beam, and the bottom is provided with a notch matched with the top of the arch rib. The notch at the bottom of the track seat is buckled on the top of the arch rib and welded with the arch rib.

3. The arch hoisting system for installing large-tonnage components of a variable-section steel arch bridge according to claim 1 is characterized by: The base of each arch hoist is provided with 1 to 2 traction pulleys on both sides facing the two ends of the bridge, and each traction pulley is rotatably connected to the base through a pin shaft; the two ends of the connecting rope between the two arch hoists on each arch rib are respectively wound around the traction pulleys on the opposite sides of the two arch hoists; an anchor seat is fixedly provided at both ends of the bridge corresponding to each traction winch, and the traction rope connecting the traction winch and the arch hoist passes over the traction pulley on the side of the arch hoist toward the traction winch, then turns back and is connected to the anchor seat.

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