Asymmetric molding method for partition wall columns in multi-arch tunnel pilot-tunnel-free excavation method

The invention discloses a partition wall column asymmetric molding method in a multi-arch tunnel pilot-tunnel-free excavation method. The non-pilot tunnel excavation method mid-partition wall column asymmetric molding method is based on the fact that no matter what excavation mode is adopted, a preceding hole is always subjected to a full-section working procedure, in the full-section working procedure, expanding excavation or widening can be carried out to form a mid-partition wall column space, then a mid-partition wall column steel structure body is implanted and is connected with a preceding hole steel arch frame to form a closed loop, then a formwork is installed, and the whole-section working procedure is completed; then concrete is injected from an opening in the top of the formwork, tamping is conducted, and a mid-partition wall column is formed; the construction method comprises the following steps of (1) construction of a middle partition wall column steel structure, (2) middle partition wall column