Bridge-tunnel joint tunnel broadening structure and bridging construction method

Abstract

The invention discloses a bridge-tunnel joint tunnel broadening structure and a bridging construction method. The method comprises the steps of carrying out excavation construction on a tunnel exit main tunnel through an annular excavation reserved core soil method, and enabling the width of a tunnel portal section to be greater than the width of a tunnel main body section; carrying out bridge abutment construction in the tunnel exit main tunnel; after the abutment construction is completed, carrying out backfill construction on the abutment back of the abutment; mounting a bridge erecting machine on the abutment back; conducting beam piece erecting construction on the tunnel portal section through the bridge erecting machine; and carrying out mold-building secondary lining construction after the beam pieces are erected. According to the invention, the tunnel exit bridge-tunnel joint part is widened, the width of the widened structural section is consistent with the clear width of theconstruction clearance of a tunnel emergency stop area, so that bridge-tunnel joint and bridging construction of the double gird bridge erecting machine are met. Meanwhile, the emergency stop area secondary lining formwork trolley can be comprehensively utilized for constructing a tunnel portal lining, and the cost generated by formwork modification is reduced.

Description

technical field [0001] The invention relates to the technical field of bridge-tunnel construction, in particular to a tunnel widening structure at a bridge-tunnel joint and a bridging construction method. Background technique [0002] In the existing tunnel construction structure, some tunnel exits are located on the cliff above the side depression, and the tunnel exit and the bridge are connected by bridge and tunnel. The bridge extends into the tunnel exit. The landform of gullies is characterized by large undulations, and the natural hillsides are in a stable state. The superstructure of the bridge adopts prefabricated T-beams. The tunnel exit is designed according to the building limits of the normal cross-section, which cannot meet the construction requirements of the bridge-tunnel connection and the construction of double-guided girder bridge frame girders. [0003] It can be seen from the above that some existing tunnel openings do not meet the construction requirem...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art, provide a tunnel widening structure and bridging construction method at the junction of the bridge and tunnel, solve the problem of limited space for the junction of the bridge and tunnel, and effectively ensure the safety of the construction and operation of the tunnel door

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