Water-rich stratum earth pressure balance shield starting tunnel portal sealing device

The utility model relates to a sealing device for an earth pressure balance shield starting tunnel portal of a water-rich stratum. The sealing device comprises a working well enclosure structure, a working well lining wall, a tunnel portal steel ring, an extension sleeve and a sealing component. The tunnel portal steel ring is buried in the working well lining wall; one end of the extension sleeveis connected with the tunnel portal steel ring, and the other end is a free end; the sealing part is arranged in the circumferential direction of the inner wall of the extension sleeve and the free end of the extension sleeve. The tunnel portal is good in sealing, capable of prolonging the free end of the sleeve and effectively avoiding water leakage and slurry leakage, simple in structure, goodin sealing effect, high in practicability, low in cost and good in popularization prospect, and ground surface settlement meets the standard requirement. 本实用新型涉及一种富水地层土压平衡盾构始发洞门密封装置，包括工作井围护结构、工作井内衬墙、洞门钢环、延长套筒和密封部件。所述洞门钢环埋设在所述工