In order to become rotary Drive unrestricted in the barrel for automatic pitch exclusion mud feature null digging Shank of the excavation earth and sand

摘要

PROBLEM TO BE SOLVED: To cancel defects where a sludge valve for preventing a face from being damaged cannot be interior decoration due to the dimensions in a small-aperture pipe by arranging the interior decoration of a specific opening/closing mechanism section by intermittently discharging excavated earth and sand mud concentration being adjusted by the excavating of a face using a leading advancing machine for small-aperture advancing construction method.;SOLUTION: Excavated earth and sand E1 being excavated by a rotary cutter 4 driven by a rotor 3 of a small-aperture leading advancing machine 1, and high-concentration muddy water E1 are agitated and mixed in a front side chamber 6 being formed between a rotor 3 and an outer cylinder 2 for advancing to obtain excavated earth and sand mud concentration E that is fluidized. When an earth removal inflow opening 3b in an opening is rotated to the eccentricity position of the rotor 3 and the excavated earth and sand mud concentration E is connected intermittently to a blow-off outflow opening 7b of the opening in a fixed interval plate 7c of the stator 7, the excavated earth and sand mud concentration E flows into a discharg chamber 8 in the stator 7, and is carried out via a sludge pipe 10 due to vacuum force, thus preventing the breakdown of the face due to the unsatisfactory decrease in inner pressure in the front side chamber 6.;COPYRIGHT: (C)2003,JPO