Interim antipriming of shield method tunnel portal

The utility model provides an interim antipriming of shield method tunnel portal to showing the interim sealing effect of portal when shield structure machine is appeared among the improvement shield method tunnel construction, ensureing that the shield constructs the appear security of construction of machine. It includes: booster board and closed baffle set up its upper end and portal pore wall zonulae occludens along portal pore wall hoop, the board is turned over to the double -end, sets up in succession and articulates in the lower extreme of booster board along the hoop, respectively along fixed preceding sealing component, the back sealing component of setting up of its hoop on its rear portion of meeting front portion, the back of the body soil side of soil side, follows the hoop between rear portion and the closed baffle and sets up elasticity sealing component.