CN201132941Y - Mobile formwork self-floating lower shoulder beam - Google Patents

Abstract

The utility model relates to a steel girder used in bridge construction, in particular to a movable formwork self-floating lower pole beam used for segmental girder erection. It is composed of steel girders (1), inter-beam linkages (3) and lifting lugs (2). The steel girder (1) is welded with the connecting system (3) between the girders, and the two ends of the box-shaped steel girder (1) are connected to the lifting lugs 2 through pin shafts (4) and hung on the cross bar of the main steel truss girder of the bridge building machine . The utility model adopts a self-floating lower pole beam formed by welding box-shaped steel beams and connecting systems between the beams on the working surface in the water area. It has the advantages of simple structure, convenient disassembly and transportation. When passing through the hole, use the beam lifting crane to lift the lower pole beam to the water surface, and use the self-flotation of the pole steel box girder to haul it to the next hole and put it in place, which can reduce the construction difficulty.

Description

Mobile formwork self-floating lower shoulder beam

technical field

The utility model relates to a steel girder used in bridge construction, in particular to a movable formwork self-floating lower pole beam used for segmental girder erection.

Background technique

At present, the load-bearing beams used for mobile formwork bridge building machines are mostly pushed or hung. Before passing through the holes, the load-bearing beams are pushed or removed and transported to the next hole. For mobile formwork bridge building machines constructed in sea areas, the removal of load-bearing beams requires a variety of transportation equipment to cooperate with the removal, so the investment cost is high and the efficiency is low. Therefore, it is very beneficial to invent a new type of steel truss girder that can be easily transported and dismantled.

Contents of the invention

The purpose of this utility model is to provide a mobile formwork self-floating lower pole beam to meet the needs of rapid construction against the deficiencies of the prior art.

The technical scheme of the utility model is realized in the following way: it is formed by connecting steel beams (1), inter-beam couplings (3) and lifting lugs (2), and it is characterized in that: the steel beams are variable cross-section sealed type Box-shaped steel girder; variable cross-section sealed box-shaped steel girder (1) and the connecting system (3) between the beams are welded. On the cross bar of the main steel truss girder of the bridge building machine.

The utility model adopts a self-floating lower pole beam formed by welding box-shaped steel beams and connecting systems between the beams on the working surface in the water area. It has the advantages of simple structure, convenient disassembly and transportation. When passing through the hole, use the beam lifting crane to lift the lower pole beam to the water surface, and use the self-flotation of the pole steel box girder to haul it to the next hole and put it in place, which can reduce the construction difficulty.

Description of drawings

Fig. 1 is the layout diagram of the utility model and the main truss structure

Fig. 2 is the top view of the utility model

Fig. 3 is a schematic cross-sectional view of the utility model

Detailed ways

Below in conjunction with accompanying drawing, the utility model will be further described:

As shown in Figure 1, the utility model is formed by connecting steel beams (1), inter-beam couplings (3) and lifting lugs (2), and is characterized in that the steel beams are sealed box-shaped steel beams with variable cross-section Beam; as shown in Figure 3, the variable cross-section sealed box-shaped steel beam (1) is welded with the connecting system (3) between the beams, and the two ends of the box-shaped steel beam (1) are connected to the lifting lugs ( 2) Hanging on the cross bar of the main steel truss girder of the bridge building machine.

The detachable lifting lug (2) hangs the lower pole beam on the cross bar of the main steel truss beam, and evenly transmits the construction load to the main truss beam. Both ends of the lower pole beam are provided with pin holes connected with lifting lugs. Considering that the pin shaft is long and heavy, a pin shaft sleeve is provided at the pin shaft hole to facilitate the installation of the pin shaft. At the same time, lifting lugs are set at both ends of the pole beam to facilitate the lifting of the pole beam by a crane. The top surface of the pole beam is provided with a connecting plate for connection with the steel cushion block, and a 50t hydraulic jack is placed for the elevation adjustment of the segmental box girder and unloading when the prestressed beam of the concrete box girder is stretched in stages. There are also connecting plates on both sides of the pole beam top, which are bolted to the construction platform, and the lower part of the construction platform is fully hung with safety nets.

For the water surface work area of long-span bridge erection, when the bridge-building machine hangs the pole beam and erects it vertically to the front pier, it is necessary to remove the connection of the lower pole beam to pass the pier. Since there are multiple groups of pole beams hoisted above the pier at high altitude, the risk is high and the cost is high. High and slow construction process, so the lower pole beam is designed as a sealed type. Make full use of the principle of steel box girder self-floating on the water surface (F _floating > G _self-weight ), haul it to the next hole and place it in place, and then lift and install the pole beam, avoiding multiple times of high-altitude hoisting through the pier hole, thereby reducing the difficulty of construction , reducing the construction cost and construction period.

Claims (2)

1, shoulder pole girder under a kind of mobile formwork self-floating, it is formed by connecting by bracing (3) between girder steel (1), beam and hanger (2), it is characterized in that: described girder steel is the sealed box steel beam of variable cross-section.

2, shoulder pole girder under the mobile formwork self-floating according to claim 1, it is characterized in that: bracing (3) is welded between sealed box steel beam of variable cross-section (1) and beam, and box steel beam (1) two ends connect hanger 2 by bearing pin (4) and hang on the cross bar of bridge fabrication machine master steel truss girder.

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