Tunnel widening structure at bridge-tunnel junction

Abstract

The invention discloses a tunnel widening structure at a bridge-tunnel junction and a bridging construction method, which comprises the following steps: excavating and constructing the main hole of the tunnel exit by means of ring excavation and reserving core soil, so that the width of the tunnel entrance section is larger than that of the tunnel main body section width; abutment construction is carried out in the tunnel exit main hole; after the abutment construction is completed, the abutment back of the abutment is backfilled; a bridge erecting machine is installed on the abutment back; through the abutment The bridge crane carries out the erection of the beams at the tunnel entrance; after the erection of the beams is completed, the secondary lining construction is carried out by molding. The present invention widens the junction of the bridge and tunnel at the exit of the tunnel, and the widened structural section is consistent with the clear width of the construction limit of the emergency parking zone of the tunnel, so as to meet the requirements of the bridge-tunnel junction and double guide girder bridging frame girder construction, and can comprehensively utilize emergency The parking trolley with the second lining formwork is used to construct the lining of the opening to reduce the cost of formwork modification.

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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