Method for constructing underground structure of railroad using steel pipe roof of two-side semicircle arch type

摘要

Provided is a construction method of a railroad lower part transverse structure using a steel pipe roof of a both sides semicircle arch type which is capable of improving the excavating speed inside a steel pipe by using a both sides semicircle arch type steel pipe of the size about connection of two circular steel pipes. The construction method of a railroad lower part transverse structure using a steel pipe roof of a both sides semicircle arch type is capable of preventing inflow of ground water permeated into a joint part, and being to be applicable to low over burden, and having little relaxation to neighboring ground, and having good construction by maintaining the level of the upper and lower sides since a H-shaped steel pipe and steel pipe of a both-sides semicircle arch type where the upper and lower parts are horizontal and both sides are a semicircle arch type are used. The construction method of a railroad lower part transverse structure comprises: a step for installing a propulsion base and an arrival base by primarily excavating both sides of a railroad; a step for installing a propulsive frame in the propulsion base and arranging a head pipe; a step for pressure-input propelling the H-shaped steel pipe and steel pipe of a both sides semicircle arch type for an upper structure; a step for excavating secondarily a place for vertical wall propulsion, and for installing a propulsive workbench; a step for pressure-input propelling the H-shaped steel pipe and steel pipe of a both sides semicircle arch type for a vertical wall; and a step for installing a reinforcing bar inside the steel pipe of a both sides semicircle arch type, for placing a bar, and for depositing concrete. In the steel pipe of a both sides semicircle arch type, the upper and lower parts are horizontal, and both sides are a semicircle arch type.