Secondary lining split mounting type blocking head device for metro underground excavation tunnel

Abstract

The invention particularly relates to a secondary lining split mounting type blocking head device for a metro underground excavation tunnel, which resolves the problems that due to an unreasonable structure of an existing secondary lining blocking head device, reinforced steel bar at construction joints is prone to be broken and waterproof materials cannot be installed in the right positions. The secondary lining split mounting type blocking head device comprises an arc blocking head steel plate which is formed of a plurality of steel plate base bodies, wherein a longitudinal reinforced steel bar clamp groove is arranged at the outer arc edge of each steel plate base body, a key groove shaped bolt hole is arranged on one side of the inner arc of each steel plate base body, a bolt is screwed in the bolt hole, the inner side of the blocking head base body is provided with an arc reinforced steel bar fixed with the section of a secondary lining trolley, radially arranged reinforced sleeves are evenly distributed and fixed on the reinforced steel bar, reinforced steel tubes are arranged in the reinforced sleeves, wood wedges are plugged between the reinforced steel tubes and the blocking head steel plates, and a galvanized water stopping steel plate is welded on an outer arc end face of the blocking head steel plate in point mode. The secondary lining split mounting type blocking head device is reasonable in structural design, can buffer force deformation, is supported and fixed by the reinforced steel tubes, is good in waterproof effect, and has the advantages of being simple in process, convenient in operation and capable of saving cost.

Description

technical field [0001] The invention relates to a head stop device for underground excavation tunnels of subways, in particular to a secondary lining assembled head stop device for underground excavation tunnels of subways. Background technique [0002] The shield tunneling method is more and more chosen for underground excavation of subway tunnels. However, the shield method is not suitable for construction in uneven ground; it cannot be applied to the construction of complex sections such as turnback lines and crossover lines; the construction of sections with small line spacing and pile foundation underpinning sections. However, the mining method is still often selected in the medium and slightly weathered layers, uneven distribution of strata, shallow buried underground excavation sections and unsuitable shield tunneling construction sites. The construction of the secondary lining has naturally become an important link in the construction of the mining method. [0003]...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing secondary lining head stopper is unreasonable in structure, the steel bars at the construction joints are easily broken and the waterproof material is not installed in place, and the present invention provides a secondary lining assembled head stopper for underground excavation tunnels

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