TUNNEL-EXCAVATION AUXILIARY APPARATUS

摘要

A tunnel-excavation auxiliary apparatus (20) is provided with a counterforce receiving member (21), and first and second split members (22, 23). When an excavation machine (10) is used to excavate a second tunnel (T2), the counterforce receiving member (21) forms, at first-tunnel (T1) sides where the first and second tunnels (T1, T2) are to intersect, a substitute surface for a side wall (T2a) of the second tunnel (T2), and grippers (12a) of the excavation machine (10) press against the substitute surface. The first and second split members (22, 23) are disposed so as to press against side walls (T1a) of the first tunnel (T1), support the counterforce receiving member (21) in the first tunnel (T1), and are capable of advancing and retracting with respect to side walls (T1a) of the first tunnel (T1).