Method for installing large-tonnage component of large-span steel box arch bridge

Abstract

The invention relates to a method for installing a large-tonnage component of a large-span steel box arch bridge, which is characterized in that two arch cranes are respectively arranged on two arch ribs, each arch crane is provided with a hoisting winch and a balancing winch, and the two arch cranes on the same arch rib have a certain distance and are connected through a connecting rope; a distance adjusting steel wire rope is arranged between every two arch cranes opposite to each other in the transverse bridge direction on the two arch ribs, and the two ends of the distance adjusting steel wire rope are connected with balance winches on the two arch cranes respectively; the four arch cranes are dragged by traction winches arranged at the two ends of the bridge to walk on the arch ribs in a no-load mode, the distance adjusting steel wire ropes are in a relaxed state in the walking process, the arch cranes on the two arch ribs can automatically adapt to the distance change of the two arch ribs, and when the arch cranes walk to the lifting position, the distance adjusting steel wire ropes are tightened by balance winches, and the distance is adjusted. And the hoisting winch lowers the hoisting steel wire rope hoisting component. The device is suitable for uniform-section and variable-section arch bridges, can hoist large-section and large-tonnage components, and is high in construction efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and relates to a method for installing large-tonnage components of a large-span steel box arch bridge by using an arch hoist. 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, but the cable crane system requires the installation of a powerful cable tower and anchoring system, which requires large temporary facilities and is costly. In addition, the cable crane has limited lifting capacity. When hoisting the steel box girder, the steel box girder 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 solve the above-mentioned problems and provide a method for installing large-tonnage components of a large-span steel box arch bridge using an arch hoist. The method can be applied to variable-section arch bridges such as parallel rib arch bridges, basket arch bridges, and butterfly arch bridges, and the lifting capacity of the arch hoist can be improved.

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

[0006] A method for installing large-tonnage components of a large-span steel box arch bridge, characterized by comprising the following steps:

[0007] (1) During the installation of the arch ribs of the arch bridge, a track system for the arch crane to travel is installed on the two arch ribs. The track system includes a track seat and a track beam. There are multiple track seats, one of which is arranged at a certain interval on the two arch ribs. Each track seat is welded to the top of the arch rib. At least two track beams are arranged on each arch rib. The track beams are welded to each track seat along the axial direction of the arch rib.

[0008] (2) After the arch ribs are closed, two arch hoists are respectively installed on the two arch ribs. Each arch hoist is provided with a track wheel at the bottom. It is supported on the track beam on the arch rib through the track wheel and can move along the track beam. Each arch hoist is provided with a lifting winch and a balancing winch. Each arch hoist is provided with a first fixed pulley at the end facing the outer side of the arch rib and a second fixed pulley at the end facing the inner side of the arch rib. The two arch hoists on the same arch rib are spaced a certain distance apart and 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 transverse direction, and a pitch-adjustable steel wire rope is arranged between each two arch hoists opposite to each other in transverse direction on the two arch ribs, and both ends of the pitch-adjustable steel wire rope are respectively passed around the second fixed pulleys on the two arch hoists, and are respectively connected to the balancing winches on the two arch hoists, and the lifting winch on each arch hoist is connected to the lifting steel wire rope, and one end of the lifting steel wire rope is passed around the first fixed pulley, hangs down on the outside of the arch rib and is connected to the hook;

[0009] (3) A traction winch is provided at each end of the bridge corresponding to each arch hoist, and the traction winch is connected to the side of the arch hoist facing the traction winch through a traction rope;

[0010] (4) Use a transport ship to transport the bridge components to be installed to the installation position under the bridge; start the traction winch, control the traction winch at one end of the bridge to collect the cable, and the traction winch at the other end of the bridge to release the cable, and pull the four arch cranes to move on the arch rib. During the movement of the arch crane, the winch that releases the cable provides a certain counter-pulling force while releasing the cable, so that the connecting wire rope between the two arch cranes on the same arch rib is always in a taut state. At the same time, control the balance winches on each arch crane to relax the pitch-adjusting wire rope, so that the arch cranes on the two arch ribs can automatically adapt to the change in the spacing between the two arch ribs; after the arch crane moves to the top of the transport ship, it stops, controls the balance winch to tighten the pitch-adjusting wire rope, and lowers the lifting wire rope to connect with the components to be installed on the ship, and lifts the components to the installation position for installation; after the installation of one component is completed, repeat the above process to lift the next bridge component until all bridge components are hoisted.

[0011] The present invention arranges two arch hoists on each arch rib. The two arch hoists on each arch rib have a certain interval and are connected by a connecting rope. They can lift large-section and large-tonnage steel box girders, thereby improving construction efficiency. The arch hoists on the two arch ribs are connected by an adjustable-pitch steel wire rope. The length, i.e., the tightness, of the adjustable-pitch steel wire rope is controlled by a balancing winch, which can adapt to the change in the interval between the two arch ribs of a variable-section arch bridge. Therefore, the arch hoists can be applied to the construction of both equal-section and variable-section arch bridges, thereby expanding the application scope of the arch hoists and reducing construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the cross-bridge layout of the arch crane adopted in the present invention;

[0013] Figure 2 It is a schematic diagram of the layout of the arch hoist along the bridge adopted by the present invention;

[0014] Figure 3 It is a schematic structural diagram of a track seat used in the present invention;

[0015] Figure 4 It is a side view of the overall structure along the bridge direction of the arch hanging system adopted by the present invention;

[0016] Figure 5 It is a schematic diagram of the state of the hoisting boom of the present invention;

[0017] Figure 6 It is a schematic diagram of the state of hoisting the steel box girder of the present invention;

[0018] Figure 7 This is a schematic diagram of the status of the bridge when construction is completed. DETAILED DESCRIPTION

[0019] The specific implementation of the present invention is as follows:

[0020] (1) Figure 1 , Figure 2 As shown, during the installation of the arch ribs of the arch bridge, a track system for the arch crane to travel is installed on the two arch ribs 100, and the track system includes a track seat 1 and a track beam 2. There are multiple track seats, one of which is arranged at a certain interval on the two arch ribs, and each track seat 1 is welded to the top of the arch rib 100. At least two track beams are arranged on each arch rib, and the track beam 2 is welded to each track seat 1 along the axial direction of the arch rib 100.

[0021] The function of the track seat is to provide a stable support and welding surface for the track beam. Figure 3 As shown, in order to adapt to arch ribs of different cross-sections, a plane supporting the track beam and welded to the track beam can be provided on the top of each track seat, and a notch 11 matching the shape of the top of the arch rib is provided at the bottom of the track seat 2. The notch 11 at the bottom of the track seat is buckled on the top of the arch rib 100 and welded to the arch rib. Figure 1 , Figure 2 In the embodiment shown, the arch rib has a triangular cross-section, and a V-shaped notch matching the top of the triangular arch rib may be provided at the bottom of the track seat. Similarly, for the steel tube arch rib, an arc-shaped notch consistent with the curvature of the top of the steel tube arch rib may be provided at the bottom of the track seat.

[0022] During the specific construction, the track seat and the track beam can be welded to each arch rib segment before the arch rib is installed. After the arch rib segments are installed and connected, the track system is also installed synchronously with the arch rib.

[0023] To facilitate the installation of track beams, each track beam can be divided into multiple sections, each section is welded between two adjacent track seat top surfaces, and the ends of multiple track beam sections are welded in sequence, using straight lines instead of curves to form an arc-shaped track beam consistent with the arch rib line shape.

[0024] (2) After the arch ribs are installed and closed, two arch hoists 3 are respectively arranged on the two arch ribs. Each arch hoist 3 is provided with a track wheel 31 at the bottom. It is supported on the track beam 2 on the arch rib through the track wheel and can move along the track beam. Each arch hoist is provided with a lifting winch 32 and a balancing winch 33. Each arch hoist is provided with a first fixed pulley 34 at one end facing the outer side of the arch rib and a second fixed pulley 35 at one end facing the inner side of the arch rib. The two arch hoists 3 on the same arch rib 100 are spaced apart and 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 the transverse direction, and a pitch-adjustable steel wire rope 5 is arranged between each two arch hoists 3 opposite to each other in the transverse direction on the two arch ribs. Both ends of the pitch-adjustable steel wire rope 5 are respectively passed around the second fixed pulleys 35 on the two arch hoists, and are respectively connected to the balancing winches 33 on the two arch hoists. The lifting winch 32 on each arch hoist is connected to the lifting steel wire rope 6, and one end of the lifting steel wire rope 6 is passed around the first fixed pulley 34, hangs down on the outside of the arch rib and is connected to the hook;

[0025] (3) Figure 4 and Figure 2 As shown in , a traction winch 7 is respectively provided at both ends of the bridge corresponding to each arch hoist, and each traction winch 7 is connected to the arch hoist 3 on the arch rib toward the traction winch through a traction rope 8;

[0026] (4) Figure 5 , Figure 6As shown, a transport ship 9 is used to transport the bridge components such as the suspender rod and the steel box beam to be installed to the installation position under the bridge; the traction winches at both ends of the bridge are started, the traction winch at one end of the bridge is controlled to collect the cable, and the traction winch at the other end of the bridge is controlled to release the cable, so that the four arch cranes 3 are pulled to walk on the arch rib without load. During the walking of the arch crane, the winch for releasing the cable provides a certain counter-tension while releasing the cable, so that the connecting wire rope 4 between the two arch cranes on the same arch rib is always in a taut state, and at the same time, the balancing winches on each arch crane are controlled to adjust the pitch of the wire rope 5 is in a relaxed state, so that the arch cranes on the two arch ribs can automatically adapt to the change in the spacing between the two arch ribs; after the arch crane moves to the top of the transport ship, the traction winches at both ends of the bridge are controlled to stop the arch crane, and the balance winches are controlled to tighten the pitch-adjusting wire ropes. Then the hoisting winch vertically lowers the hoisting wire rope to connect with the components to be installed on the ship, and hoists the components to the installation position for installation; since the pitch-adjusting wire ropes remain tightened during the hoisting process, the arch cranes on the two arch ribs can remain stable and balanced during the hoisting process. After the installation of one component is completed, the above process is repeated to hoist the next bridge component until all bridge components are hoisted.

[0027] According to the conventional construction process, the boom is usually installed first, such as Figure 5 As shown, the arch crane is used to symmetrically hoist the hangers 200 from both ends of the bridge to the middle; after all the hangers are installed, the steel box girder is hoisted, as shown in FIG. Figure 6 As shown, the steel box girder 300 is symmetrically lifted from the middle of the bridge to both ends using an arch crane.

[0028] Since two arch hoists are arranged on each arch rib and a certain distance is set between the two arch hoists, not only the lifting capacity is increased exponentially, but also a steel box girder segment with a longer length can be hoisted, and the length of the steel box girder segment can be increased during processing, thereby improving the installation and construction efficiency. The distance between the two arch hoists on the same arch rib can be set according to the length of the steel box girder segment.

[0029] like Figure 7 As shown, after all components such as the bridge hanger 200 and the steel box girder 300 are hoisted, the arch crane and the traction system can be removed to construct the bridge deck ancillary facilities.

Claims

1. A method for installing large-tonnage components of a large-span steel box arch bridge, characterized in that: The following steps are involved: (1) During the installation of the arch ribs of the arch bridge, a track system for the arch crane to travel is installed on the two arch ribs. The track system includes a track seat and a track beam. There are multiple track seats, one of which is arranged at a certain interval on the two arch ribs. Each track seat is welded to the top of the arch rib. At least two track beams are arranged on each arch rib. The track beams are welded to each track seat along the axial direction of the arch rib. (2) After the arch ribs are closed, two arch hoists are respectively installed on the two arch ribs. Each arch hoist is provided with a track wheel at the bottom. It is supported on the track beam on the arch rib through the track wheel and can move along the track beam. Each arch hoist is provided with a lifting winch and a balancing winch. Each arch hoist is provided with a first fixed pulley at the end facing the outer side of the arch rib and a second fixed pulley at the end facing the inner side of the arch rib. The two arch hoists on the same arch rib are spaced a certain distance apart and 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 transverse direction, and a pitch-adjustable steel wire rope is arranged between each two arch hoists opposite to each other in transverse direction on the two arch ribs, and both ends of the pitch-adjustable steel wire rope are respectively passed around the second fixed pulleys on the two arch hoists, and are respectively connected to the balancing winches on the two arch hoists, and the lifting winch on each arch hoist is connected to the lifting steel wire rope, and one end of the lifting steel wire rope is passed around the first fixed pulley, hangs down on the outside of the arch rib and is connected to the hook; (3) A traction winch is provided at each end of the bridge corresponding to each arch hoist, and the traction winch is connected to the side of the arch hoist facing the traction winch through a traction rope; (4) Use a transport ship to transport the bridge components to be installed to the installation position under the bridge; start the traction winch, control the traction winch at one end of the bridge to collect the cable, and the traction winch at the other end of the bridge to release the cable, and pull the four arch cranes to move on the arch rib. During the movement of the arch crane, the winch that releases the cable provides a certain counter-pulling force while releasing the cable, so that the connecting wire rope between the two arch cranes on the same arch rib is always in a taut state. At the same time, control the balance winches on each arch crane to relax the pitch-adjusting wire rope, so that the arch cranes on the two arch ribs can automatically adapt to the change in the spacing between the two arch ribs; after the arch crane moves to the top of the transport ship, it stops, controls the balance winch to tighten the pitch-adjusting wire rope, and lowers the lifting wire rope to connect with the components to be installed on the ship, and lifts the components to the installation position for installation; after the installation of one component is completed, repeat the above process to lift the next bridge component until all bridge components are hoisted.

2. The method for installing large-tonnage components of a large-span steel box arch bridge according to claim 1 is characterized in that: Each track seat has a plane on the top that supports the track beam and is welded to the track beam, and a notch on the bottom that matches the shape of the top of the arch rib. The notch on the bottom of the track seat is buckled on the top of the arch rib and welded to the arch rib.

3. The method for installing large-tonnage components of a large-span steel box arch bridge according to claim 1 or 2, characterized in that: Each of the track beams comprises a plurality of segments, each segment is welded between two adjacent track seat top surfaces, and the ends of the plurality of track beam segments are welded in sequence, and a curved track beam consistent with the arch rib line shape is formed by replacing the curve with a straight line.

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