Falling stone prevention buffering structure for bridge and tunnel connection part

Abstract

The invention belongs to the technical field of bridge and tunnel engineering and relates to a falling stone prevention buffering structure for a bridge and tunnel connection part. Open cut tunnels on a tunnel entrance and a bridge are divided into three levels, wherein the first-level open cut tunnel is located under a channel roof mountain cliff, an original open cut tunnel is recovered according to the original shape and does not serve as a load bearing member, and a foam material buffering layer is arranged between a newly added cover arch and the original open cut tunnel; the second-level open cut tunnel is located on the bridge, and a tunnel roof is designed to be a caved material diffusion and accumulation area; the third-level open cut tunnel is located behind the second-level open cut tunnel, a direct wall of the third-level open cut tunnel is provided with ventilation windows so as to weaken lateral influences of light and shade changes of light at the tunnel entrance and crosswind in valleys on traffic, and enough longitudinal spacing is kept. The falling stone prevention buffering structure for the bridge and tunnel connection part has the advantages that at the tunnel entrance with weak geological conditions, safety of the open cut tunnels can be protected effectively, and damage of weathered dimension stone falling to the open cut channels is reduced.

Description

technical field

[0001] The invention belongs to the technical field of bridge and tunnel engineering, and relates to a buffer structure for preventing falling rocks connected by bridges and tunnels. Background technique

[0002] When the bridge and the tunnel have mutual influence, the corresponding bridge end point, the tunnel opening and the connection section between the bridge and tunnel are collectively referred to as the bridge-tunnel connection part, referred to as the bridge-tunnel connection. In mountainous areas, due to the short distance between the end point of the bridge and the tunnel door, the mutual influence between the two must be considered in the design and construction.

[0003] Due to the influence of irresistible natural factors during the construction and operation period, as well as the disturbance of vehicles during the operation period, although the rock mass above the tunnel has been reinforced, it is still inevitable that there will be rockfall, ...

Images