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With the tunnel branching confluence road widening section null shielded tunnelling machine which was constructed excavation manner of the tunnel and construction manner of the tunnel branching confluence road widening section which uses
With the tunnel branching confluence road widening section null shielded tunnelling machine which was constructed excavation manner of the tunnel and construction manner of the tunnel branching confluence road widening section which uses
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机译：结合隧道开挖方式构造的隧道分岔合流道路拓宽段和使用隧道分岔合流道路拓宽段的施工方式。
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摘要
PROBLEM TO BE SOLVED: To provide a construction method of a tunnel branch/confluent width expanding part, capable of shortening a construction period, capable of reducing construction cost, capable of excavating and carrying out the inside natural ground after constructing a structural skeleton, capable of rationalizing a structure by load reduction in a main track tunnel, capable of restraining influence on the peripheral ground, and capable of reducing the size in a required site width in response to the required inside of a branch/confluent part, by simplifying joining construction by reducing a connecting width between the main track tunnel and a ramp part tunnel.;SOLUTION: This method includes a process of connecting a connecting part 40 between the main track tunnel 10 and a pair of U-shaped tunnels 22 to a connecting part 42 of the pair of mutual U-shaped tunnels after the pair of U-shaped tunnels 22 are approached to the main track tunnel 10 by a U-shaped shield machine 20 forming the ramp part tunnel 12, and a process of forming the branch/confluent width expanding part 18 by excavating the natural ground between the pair of U-shaped tunnels 22.;COPYRIGHT: (C)2008,JPO&INPIT
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