An open state is formed behind a shield of an
open type TBM (
tunnel boring machine), so that
bolting and shotcreting with
wire mesh and the like can be realized, when unfavorable geological conditions such as crushed zones are encountered, broken surrounding rock collapses and falls, which not only threatens the safety of operating personnel and equipment, but also greatly lowers the construction efficiency. The invention discloses an annular steel structure supporting construction method with the
open type TBM. The supporting TBM is provided with a shield which has an annular steel structure installation space. When the unfavorable geological conditions are encountered, the annular steel structure can be fast erected in an
assembly line mode under the protection of the shield, the shield is replaced with the annular steel structure for supporting the surrounding rock as the TBM tunnels; under the protection of the annular steel structure, an annular steel
grating and a steel mesh hollow structure are used for carrying out the
bolting and shotcreting supporting and the like, the previous extensive construction is changed to controllable standardized operation, the original
open type unsafe environment is changed to a closed protected operation zone; the construction method disclosed by the invention is different from the passive supporting which is carried out after the surrounding rock collapses and falls; the annular steel structure actively close off the broken surrounding rock, then the surrounding rock becomes a part of the supporting structure, the work amount for backfilling concrete and removing
slag is greatly reduced, and thus the method is more efficient and
safer, the cost is reduced and the operation is easy to realize.