Tunnel concealed hole construction method

The invention discloses a tunnel hidden hole construction method which comprises the following steps: S1, hidden hole excavation and support construction are carried out, and anchor net spraying and full-section profile steel frame support construction is adopted in primary support construction; s2, inverted arch construction is conducted, specifically, S21, an excavator is adopted to conduct inverted arch excavation, excavation is conducted strictly according to survey setting-out disclosure, and when the distance between the excavator and the design base is about 20 cm, mechanical cleaning is adopted in cooperation with manual cleaning; trestle construction is adopted for inverted arch and filling construction, the length of an inverted arch trestle is 18 m, the length of an inverted arch arc-shaped formwork is 6 m, and on-site assembling and in-place are carried out. The stability of the tunnel is guaranteed, and the construction progress of the tunnel is accelerated. 本发明公开了一种隧道暗洞施工方法，包括以下步骤：S1、进行暗洞开挖和支护施工