| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of overhauling a tunnel boring machine capable of reducing construction period and construction cost by eliminating a working pile construction which was required in a conventional overhauling method. Ž<P>SOLUTION: The tunnel boring machine 10 which has completed boring to a main pit arrival point in a rock is advanced for excavation from the arrival point forward to provide a gradually enlarged portion 2. Next, the upper half sliding portion area of a pile to be demolished which is arranged continuously with the gradually enlarged portion 2 is excavated by advancing the machine, and the gradually enlarged portion 2 and the upper half sliding portion of the pit 1 to be demolished are cut open from a timbering portion constructed after the advancement of the tunnel boring machine 10. An operation for advancing for excavation the tunneling boring machine 10 by one excavation length which is equal to the interval of construction of the upper half timbering and an excavating operation for constructing the upper half timbering by excavating the upper half portion of the pit 1 to be demolished within the range of one excavation length in the rear of the excavating operation are repeated over the generally entire length of the pit 1 to be demolished. The lower half portion between the lower half outside portion of the pit 1 to be demolished in which the upper half timbering is constructed and the timbering portion provided by the advancement for excavation of the tunnel boring machine 10 is excavated, and the timbering at the upper half portion of the cross section of the pit to be demolished is supported. After the pit 1 to be demolished has been excavated over the entire cross section, the tunnel boring machine 10 is disassembled and removed. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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