Auxiliary tool for multi-arch tunnel construction

The utility model discloses an auxiliary tool for multi-arch tunnel construction, a multi-arch tunnel comprises a first hole excavated in advance and a later hole excavated later, a mid-partition wall is poured at a multi-arch position after the first hole is subjected to primary support, the primary support comprises a first hole steel arch frame, and a second hole steel arch frame is arranged in the middle of the mid-partition wall. The auxiliary tool comprises an auxiliary steel plate and a plurality of supporting devices, the auxiliary steel plate is arranged on the side, facing the rear hole, of the middle partition wall, and a damping layer is arranged between the auxiliary steel plate and the middle partition wall; the multiple supporting devices are evenly distributed between the auxiliary steel plate and the preceding hole steel arch, one end of any supporting device is fixedly connected with the auxiliary steel plate, and the other end of any supporting device is connected to the preceding hole stee