DRAINAGE STRUCTURE IN TUNNEL AND METHOD CONSTRUCTING THEREOF

PURPOSE: A drainage structure for a tunnel and a construction method thereof are provided to simplify a drainage structure inside a tunnel, to mechanize the construction of the drainage structure, to shorten a construction period, and to improve maintenance efficiency. CONSTITUTION: A drainage structure for a tunnel comprises a dummy ditch perforated drainpipe, a percolating water perforated drainpipe (20), a lateral drainpipe (30), and a dummy ditch collecting well (50). The dummy ditch perforated drainpipe is installed on the bottom of a drainage structure construction area (A) in the longitudinal direction of a drainage structure to discharge underground water flowing in the bottom of a tunnel (10). The percolating water perforated drainpipe is installed in a leveling concrete area (14) adjacent to the bottom of the sidewall of the tunnel in the longitudinal direction. The percolating water perforated drainpipe is formed with a plurality of inlets to allow percolating water to flow in through a waterproof film on the wall of the tunnel. The lateral drainpipe connects the percolating water perforated drainpipe to the dummy ditch perforated drainpipe in order to drain percolating water flowing in the percolating water perforated drainpipe to the dummy ditch perforated drainpipe. The dummy ditch collecting well is joined to the dummy ditch perforated drainpipe which is connected to the lateral drainpipe by partially covering it. The dummy ditch collecting well is formed with a sealing opening and closing member (52) to prevent the inflow of foreign substances or contaminated water from a paved road.