Tunnel connection channel construction method of shield interval

The invention discloses a tunnel connection channel construction method of a shield interval, which comprises the following steps: 1. an enclosed plain concrete continuous wall which is used as a water sealing curtain is arranged at the periphery of the connection channel ; 2. a mixing pile or grouting is adopted inside of the connection channel area to reinforce soil body; 3. excavating vertical well construction is carried out within the range of a reinforce area; 4. a subsurface excavation method is adopted to carry out excavation and lining construction for the connecting channel from both sides of the vertical well. 5. after the construction of the connecting channel interval is completed and a shield machine entirely passes through a reinforce body, a tube sheet positioned at the connecting channel portal is cut off, the portal waterstop and the portal structure of the connecting channel are constructed; the lining structure of the connecting channel positioned at the vertical well is also constructed and the vertical well is refilled, finally the connecting channel is completed; the stratum reinforce construction method of the connecting channel is high in efficiency and safe, can be promoted and applied to the construction of reinforcing stratum for changing the tool bits of the shield machine, thereby providing reliable guarantee for changing the tool bits of the shield machine.