Concrete backfill structure behind steel pipe in tunnel

The utility model discloses a concrete backfilling structure behind a steel pipe in a tunnel. The device comprises a tunnel body and a steel pipe installed in the tunnel body, an interlayer is reserved between the tunnel body and the steel pipe, the two ends of the interlayer are closed, an exhaust port is reserved, pouring pipes are arranged in the steel pipe at intervals, the pouring pipes are communicated with the interlayer, and a gate plate is arranged at the input end of each pouring pipe; grouting pipes are evenly distributed between the pouring pipes. The pouring pipe is arranged in the steel pipe, the space between the tunnel and the steel pipe is densely filled with concrete, the space of the steel pipe is effectively utilized, and construction is facilitated. 本实用新型公开了一种隧洞内钢管背后回填混凝土结构，包括隧洞洞身和安装在隧洞洞身内的钢管，所述隧洞洞身与钢管之间留有夹层，所述夹层两端封闭设置，预留有排气口，所述钢管内间隔设有浇筑管，所述浇筑管与所述夹层相连通，所述浇筑管的输入端设有闸板；所述浇筑管之间均匀分布有注浆管。本实用新型通过在钢管内设置浇筑管，将混凝土密实的填充在隧洞与钢管之间，有效利用钢管空间，便于施工。