A beam-dropping device suitable for beam transport and installation on track supports

Abstract

This invention relates to a beam-dropping device suitable for beam transport and installation on a track support system. A movable longitudinal beam is installed along the bridge direction on the outer side of each longitudinal load-bearing beam of the track support system. Rollers are installed on the top surfaces of both ends of the transverse load-bearing beams of the track support system. The movable longitudinal beams are supported on the rollers. A traction rope is connected to the front end of each movable longitudinal beam, and the traction rope is connected to a hand-operated hoist. The length of the movable longitudinal beam is not less than the length of one box girder segment. Two beam-dropping jacks and two three-way jacks are installed on the top surface of each movable longitudinal beam. Using this invention, most of the beam-dropping operations are performed on the outer side of the support system, providing ample operating space and reducing construction difficulty. The movable longitudinal beams can be quickly moved to the beam-dropping area, resulting in high construction efficiency.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction and relates to the construction of steel box girders using track supports for transportation and installation. Specifically, it relates to a girder lowering device suitable for transporting and installing girder using track supports. Background Technology

[0002] Steel box girders for cable-stayed and suspension bridges are often installed using the track-supported method. This method involves erecting supports in the girder lifting area and bridge site area, laying tracks on the supports, and using a track-mounted girder transport vehicle to move the steel box girders along the supports. This method has advantages such as less high-altitude work, higher safety, and no restrictions on traffic conditions under the bridge. However, the girder lowering stage presents certain difficulties. After the girder transport vehicle delivers a steel box girder segment to its designated location, the girder needs to be unloaded from the vehicle and safely and accurately lowered to the installation position. The typical girder lowering process is as follows:

[0003] Jacks and steel sand cylinders are installed on the beam bottom support. The height of the steel sand cylinder is consistent with the design installation height of the steel box girder. Since the steel box girder is relatively high on the beam transport vehicle, and the jacking stroke is limited, multiple layers of steel pads need to be installed on the jacks and steel sand cylinders respectively. First, the steel box girder is lifted off the beam transport vehicle with the jacks, the beam transport vehicle is withdrawn, and then the jacks are returned to their original position, lowering the steel box girder onto the steel pads on top of the steel sand cylinder. The top layer of pads on the jacks is removed, the jacks are lifted again, lifting the steel box girder off the steel sand cylinder, and the top layer of pads on the steel sand cylinder is removed. The jacks are lowered back onto the pads on top of the steel sand cylinder, and the top layer of pads on the jacks is removed again. This operation is repeated to gradually reduce the number of steel pads on the jacks and the top of the steel sand cylinder until all the pads on the steel sand cylinder are removed. Finally, the steel box girder is lowered onto the steel sand cylinder. After each box girder segment is lowered into place, welding is carried out between the segments to connect all the steel box girder segments into a whole. Finally, all steel sand cylinders are simultaneously released to lower the height, the supports are removed, and the installation of the steel box girder is completed.

[0004] The above-mentioned beam lowering process requires construction workers to operate under the beam for a long time. However, the operating space under the beam is small and the operation is difficult. In particular, as the height of the steel box girder decreases, the operating space becomes smaller and smaller, and the construction difficulty increases.

[0005] In addition, after the steel box girder is lowered into place, there will inevitably be errors in its position and angle, and the alignment of the steel box girder needs to be further adjusted. This process is generally carried out by three-way jacks at the bottom of the beam, which is difficult to operate due to the narrow space at the bottom of the beam. Summary of the Invention

[0006] The purpose of this invention is to provide a beam-dropping device and method suitable for track-supported beam transport and installation, thereby solving the beam-dropping problem existing in the current track-supported method for installing steel box girders.

[0007] The technical solution of the present invention is as follows:

[0008] A beam-dropping device suitable for beam transport and installation on a track support system, the track support system comprising multiple rows of steel pipe piles arranged transversely along the bridge direction, a transverse load-bearing beam erected on each row of steel pipe piles, two longitudinal load-bearing beams erected along the bridge direction on each transverse load-bearing beam, two beam-transporting vehicle guide rails arranged along the bridge direction on each longitudinal load-bearing beam, and each transverse load-bearing beam extending to a certain length beyond the outer sides of the two longitudinal load-bearing beams at both ends, characterized in that: a roller is fixedly installed transversely along the top surface of each end of the transverse load-bearing beam extending to the outer sides of the longitudinal load-bearing beams; a movable longitudinal beam is installed along the bridge direction on the outer side of each longitudinal load-bearing beam, the movable longitudinal beams being supported on the rollers on the top surface of the transverse load-bearing beams; a traction rope is connected to the front end of each movable longitudinal beam, one end of the traction rope being connected to the movable longitudinal beam, and the other end being connected to a hand-operated hoist; the length of the movable longitudinal beam is not less than the length of a box girder segment, and two beam-dropping jacks and two three-way jacks are respectively installed on the top surface of each movable longitudinal beam.

[0009] Based on the existing track support structure, this invention sets up a movable longitudinal beam on the outside of the longitudinal load-bearing beam of the track support, and sets the beam-lowering jacks and three-way jacks on the movable longitudinal beam. Most of the operations during the beam lowering process are carried out on the outside of the support, which provides a large operating space and reduces construction difficulty. The movable longitudinal beam adopts a sliding installation structure, and after one box girder is lowered, it can be quickly moved to the next construction position, which greatly improves construction efficiency. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0011] Figure 2 This is a schematic diagram of the idler roller. Detailed Implementation

[0012] like Figure 1 As shown, the track support for transporting steel box girders includes multiple rows of steel pipe piles 1 arranged transversely along the bridge direction. A transverse load-bearing beam 2 is erected on each row of steel pipe piles. Two longitudinal load-bearing beams 3 are erected along the bridge direction on each transverse load-bearing beam. Two beam-transporting vehicle guide rails 4 are arranged along the bridge direction on each longitudinal load-bearing beam. Both ends of each transverse load-bearing beam extend to a certain length outside the two longitudinal load-bearing beams. A roller 5 is fixed transversely along the top surface of each end of the transverse load-bearing beam extending to the outer surface of the longitudinal load-bearing beams. A movable longitudinal beam 6 is arranged along the bridge direction on the outer surface of each longitudinal load-bearing beam. The movable longitudinal beam 6 is supported on the roller 5 on the top surface of the transverse load-bearing beams. A traction rope 7 is connected to the front end of each movable longitudinal beam 6. One end of the traction rope 7 is connected to the movable longitudinal beam 6, and the other end is connected to a hand-operated hoist 8. The length of the movable longitudinal beam is not less than the length of one box girder segment. Two beam-dropping jacks 9 and two three-way jacks 10 are respectively installed on the top surface of each movable longitudinal beam 6.

[0013] The above structure can be moved by pulling the longitudinal beam 7 along the bridge direction using a hand-operated hoist 8, and moved to the position where the beam needs to be lowered.

[0014] like Figure 2 As shown, the idler roller 5 includes a base 51, with side plates 52 welded to both ends of the base. A roller 53 is disposed between the two side plates, and the two ends of the roller's rotating shaft 54 ​​are rotatably connected to the two side plates 52 respectively. The top edges of the two side plates are higher than the roller. Figure 1 As shown, the base of the idler roller 5 is fixed on the transverse load-bearing beam 2, and the movable longitudinal beam 6 is located between the two side plates of the idler roller and supported on the roller cylinder. The two side plates 52 of the idler roller can limit the movement of the longitudinal beam 6.

[0015] In a specific implementation of this invention, the hand-operated hoist 8 can be installed inside the longitudinal load-bearing beam 3 and connected to a transverse load-bearing beam 2. A steering wheel 11 is installed on each of the two front ends of the longitudinal load-bearing beam 3. The traction rope 7 passes around the two steering wheels 11 and connects to the movable longitudinal beam 6 and the hand-operated hoist 8 respectively. This configuration allows the hand-operated hoist to continuously move the movable longitudinal beam within the entire length of the support frame.

[0016] The method for lowering beams using the aforementioned beam-lowering device is as follows:

[0017] (1) After the beam transport vehicle transports a steel box girder to the position, it pulls two moving longitudinal beams to the lower sides of the steel box girder by hand-operated hoists. Two steel sand cylinders 12 are set on the two longitudinal load-bearing beams 3 at the bottom of the steel box girder respectively. Multi-layer steel pads are installed on the top of the steel sand cylinders 12 and the beam dropping jacks 9 respectively.

[0018] (2) Simultaneously start the jacks on the moving longitudinal beam to lift the steel box girder, and the beam transport vehicle withdraws;

[0019] (3) The steel box girder is supported alternately by the lowering jack 9 and the steel sand cylinder 12, and the steel pads on the lowering jack and the steel sand cylinder are removed layer by layer until the steel box girder is lowered to the installation height and supported on the steel sand cylinder; the method of the lowering jack and the steel sand cylinder supporting the steel box girder alternately and removing the steel pads layer by layer is the same as the conventional lowering method.

[0020] (4) Simultaneously start each of the three-way jacks 10 on the moving longitudinal beam to adjust the steel box girder alignment and complete the lowering and fine-tuning of a steel beam.

Claims

1. A beam falling device suitable for track support beam installation, the track support comprising a plurality of rows of steel pipe piles arranged transversely, one transverse load bearing beam being arranged on each row of steel pipe piles, two longitudinal load bearing beams being arranged longitudinally on each transverse load bearing beam, two beam transport vehicle guide rails being arranged longitudinally on each longitudinal load bearing beam, each transverse load bearing beam extending a certain length to the outside of two longitudinal load bearing beams at both ends respectively, characterized in that: Each transverse load-bearing beam extends to the top surface of the two ends outside the longitudinal load-bearing beam and is fixedly provided with a roller in the transverse direction, each longitudinal load-bearing beam is provided with a movable longitudinal beam in the longitudinal direction outside the beam, the movable longitudinal beam is supported on the roller on the top surface of the transverse load-bearing beam; the front end of each movable longitudinal beam is connected with a traction rope, one end of the traction rope is connected with the movable longitudinal beam, and the other end is connected with a hand-operated hoist; the length of the movable longitudinal beam is not less than the length of one box girder segment, and the top surface of each movable longitudinal beam is provided with two beam-lowering jacks and two three-way jacks. ​ 2. The beam dropping device suitable for rail support beam installation according to claim 1, characterized in that: The roller comprises a base, a side plate is welded at each end of the base, a roller cylinder is arranged between the two side plates, the rotating shafts of the roller cylinder are rotatably connected with the two side plates, and the top edges of the two side plates are higher than the roller cylinder; the base of the roller is fixed on the transverse load-bearing beam, the movable longitudinal beam is located between the two side plates of the roller and is supported on the roller cylinder of the roller.

3. The beam dropping device suitable for rail support beam installation according to claim 1, characterized in that: The hand-operated hoist is arranged on the inner side of the longitudinal load-bearing beam and is connected with a transverse load-bearing beam, turning wheels are arranged on the two sides of the front end of the longitudinal load-bearing beam, and the traction rope is wound around the two turning wheels and is connected with the movable longitudinal beam and the hand-operated hoist.

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