Bridge-tunnel integration flexible steel mesh open cut tunnel structure for preventing falling rocks

Abstract

The invention relates to a bridge-tunnel integration flexible steel mesh open cut tunnel structure for preventing falling rocks. In mountainous areas, mountain slopes are usually abrupt and sites are usually narrow, the conditions for arranging a falling rock preventing structure at a lengthened tunnel portal can not be met, the bridge abutment built-in-tunnel or bridge-tunnel adjacency phenomenon is common due to restriction of tunnel portal engineering conditions, and common tunnel portal structures are not applicable... A plurality of covers are arranged above a bridge body structure, a plurality of steel arch frames perpendicular to a route are arranged, steel strands along the route are arranged among the steel arch frames, an annular net covering the steel arch frames and the steel strands is arranged above the steel strands, a grid net clung to the annular net is arranged above the annular net, and a crossed support rod is arranged between the bottoms of every two adjacent steel arch frames. The bridge-tunnel integration flexible steel mesh open cut tunnel structure for preventing falling rocks is convenient to install and manufacture, powerful in impact resistance, high in strength, light in weight and attractive in appearance, can be integrated with a bridge, and can isolate an external environment from a traveling environment relatively, so that an in-tunnel environment and an external environment do not influence each other.

Description

technical field [0001] The invention belongs to the technical field of traffic engineering, and in particular relates to a bridge-tunnel integrated anti-rockfall flexible steel mesh open tunnel structure. Background technique [0002] When building high-speed railways in mountainous areas, the slopes are generally steep and the site is narrow, so there is no condition for installing rockfall prevention structures at the tunnel gates. The tunnels of the Xicheng Passenger Dedicated Line are mainly concentrated in the Qinling Mountains and Daba Mountains. Within the scope of the project, the mountains are steep and the valleys are vertical and horizontal. Most of the tunnel entrances are "V"-shaped valleys. The phenomenon of abutment entry or adjacent bridges and tunnels is relatively common, and the common portal structure cannot be applied. In order to ensure the safe, fast and normal operation of the train, and minimize the speed limit and wheel stop, it is necessary to rel...

AI Technical Summary

Problems solved by technology

If the terrain and stratum conditions permit, the anti-falling rock structure is an open hole that extends the tunnel door to a certain length, or a reinforced concrete open hole structure set on a separate pile foundation, which can prevent falling rocks from hitting lines or trains However, when the tunnels present the characteristics of long and dense tunnel groups, the distance between the open lines between the two tunnels is generally small, and the height difference between the lines and the center of the ditch is large, the conditions for connecting the long tunnels are insufficient. The foundation is difficult and the investment and construction are more difficult

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