Construction method of synchronous grouting process for ground in-out shield-driven tunnel

The invention provides a construction method of a synchronous grouting process for a ground in-out shield-driven tunnel. The construction method comprises the following steps: 1, producing grout; 2, confirming synchronous grouting construction parameters according to working conditions, wherein the synchronous grouting construction parameters are injecting rate, proportional distribution of the upper part and the lower part, and grouting pressure control; 3, carrying out construction according to the synchronous grouting construction parameters. The construction method has the benefits that 1, in the aspect of performance index, a grout material can perform better flowing and filling performances than a conventional grout material; 2, in the aspect of performance index, the grout material has higher early strength than the conventional grout material; 3, the construction parameters are obtained according to different working conditions of a ground in-out shield-driven tunnel, so that construction quality can be controlled effectively.