TUNNEL CONSTRUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a tunnel construction method shortening a construction period and considerably reducing a construction cost with safe and efficient construction work in uniting a vertical shaft and an underground tunnel. SOLUTION: The tunnel construction method comprises a vertical shaft construction process for sinking a vertical shaft wall surface member down to a support layer and sinking a machinable member machinable by a succeeding side shield machine instead of a normal vertical shaft wall surface member, as the vertical shaft wall surface member located at a branch junction part; an inside buried material filling process for filling an inside buried material in the branch junction part on the vertical shaft side; a succeeding tunnel penetration construction process for advancing for excavation while constructing a succeeding tunnel and cutting the inside buried material and the machinable member on the vertical shaft side to carry out intersecting penetration into the vertical shaft; a natural ground improving process for improving the natural ground around the branch junction part; and a wall surface communicating process for allowing the intersecting wall surfaces on the vertical shaft side and the succeeding tunnel side to communicate with each other. COPYRIGHT: (C)2008,JPO&INPIT