Steel box girder mounting method under clear height restricted condition

Abstract

The invention relates to a method for installing a steel box girder in a state of limited clear height, comprising the following steps: S1: installing a column under the bridge, setting a support system, track beams and tracks on both sides of the column, at least one end of the track is located outside the bridge , set the sliding trolley on the track; S2: Hoist the first steel box girder to the sliding trolley for temporary fixation, and use the traction device to slide the sliding trolley to the predetermined position; S3: Put the first steel box girder After positioning, fix it with a temporary portal support, move the sliding trolley to an unrestricted space, carry out the sliding construction of the second steel box girder, and repeat the subsequent sliding construction of the steel box girder; S4: all steel boxes After the girders are installed, splice the steel box girders and connect the steel box girders to the columns. The invention can ensure normal traffic during construction, and the outriggers of the crane are fixed at the same position during construction, which saves time for repeatedly outrigging and retracting the legs, saves costs, and improves construction efficiency.

Description

Technical field [0001] The invention relates to the field of steel box girder installation, and more specifically, to a method for installing a steel box girder in a state where the clear height is limited. Background technique [0002] The widening and transformation of H ramp and transition section in a certain city adopts the form of wide steel box girder. In order to avoid the subway tunnels that have been built underground, the steel box girder pier is designed under the wide steel box girder. The top of the steel box girder gate pier is only 0.5 meters away from the bottom of the existing viaduct. The conventional hoisting method can only install the steel columns on both sides, and cannot install the steel beams above the steel columns. [0003] In the past, the construction of this type of steel box girder mainly used the sliding method of erecting full-floor scaffolding, vertical jacking or horizontal jacking. The construction method of full-floor scaffolding sliding and v...

AI Technical Summary

Problems solved by technology

The top of the steel box girder portal pier is only 0.5 meters away from the bottom of the existing viaduct. The conventional hoisting method can only install the steel columns on both sides, but cannot install the steel beams above the steel columns

[0003] In the past, the construction of this kind of steel box girder was mainly carried out by setting up a full-scale scaffolding sliding method, vertical jacking or horizontal jacking. ...

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