Rapid construction method for tunnel located at bridge and tunnel connected segment

Abstract

The invention discloses a rapid construction method for a tunnel located at a bridge and tunnel connected segment. The rapid construction method for the tunnel located at the bridge and tunnel connected segment comprises the following steps that an entrance of a construction transverse hole is selected to enter the hole; transverse hole excavation and transverse hole intersection main hole construction are carried out; left line main hole bi-directional excavation construction is carried out; vehicle travelling transverse hole construction is carried out; and right-line main hole bi-directional excavation construction is carried out. Through a mode of excavating the transverse holes to enter the main hole, then the bi-directional excavation is carried out on the main hole, hole exiting iscarried out assisted by a double-row advanced small guide pipe mode, the defects of insufficient cliff construction space in the prior art and mutual interference of a bridge and a tunnel are overcome, and the rapid construction method for the tunnel located at the bridge and tunnel connected segment has the advantages of low construction costs, short construction period, safety and reliability and high efficiency.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to a rapid construction method for a tunnel at a connecting section of a bridge and a tunnel. Background technique [0002] With the rapid development of my country's transportation industry, more and more roads and railways are built in mountainous areas. The terrain in mountainous areas is complex and the terrain undulates greatly, so it is inevitable to build bridges and tunnels. For general mountain terrain, bridges and tunnels can be built alone, but for areas with large ups and downs, bridges and tunnels are often connected to ensure the linear index of the route. The construction of bridges and tunnels in the bridge-tunnel connection section is very difficult because there is not enough construction space for both. [0003] Mountain tunnels are usually constructed from the entrance of the tunnel under the support of an advanced large pipe shed. However, the upward slope of...

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Problems solved by technology

[0003] Mountain tunnels are usually constructed from the entrance of the tunnel under the support of large pipe sheds in advance. However, the uphill slope at the entrance of the tunnel connected by the bridge and tunnel is steep, making it difficult to build a construction access road; or the construction site is limited and cannot meet the construction requirements, and the excessive fill Excavation will destroy the ecological environment, so more effective hole drilling methods are needed to ensure safe, environmentally friendly and economical hole construction

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