SEAL DEVICE FOR INTERMEDIATE FOLD PART OF SHIELD EXCAVATOR

PURPOSE:To prevent a seal from projecting from a seal holder inside of a curve of an excavating line in a seal device for an intermediate fold part of a shield excavator, and to maintain the water tight function. CONSTITUTION:A lump-like resilient member 3 is charged in a space surrounded by a working face side end face of a seal holder 2A provided at the rear end of a shield front barrel 1A, for holding a seal 2, the inner surface of the seal front barrel 1A and a shield slide surface 1C of a shield rear barrel 1B so that the lump-like resilient member 3 is expandable in the shield-axial direction and the shield-radial direction. Further, a pressing mechanism (4, 5, 6, 7A, 7B, 8) for pressing the working face side end surface of the shield holder 2A positioned inside of the curve of the excavating line, and the seal slide surface 1C, against the lump-like resilient member 3, so as to adjust the contact surface pressure between the lump-like resilient member 3 and the seal slide surface 1C.