TUNNEL EXCAVATOR AND TUNNEL EXCAVATION METHOD

Japanese Patent JP3254643

B2

PROBLEM TO BE SOLVED: To provide a tunnel excavator and a tunnel excavation method, by which work in a chamber is eliminated and safety is improved when the excavator is switched between a muddy water pressurizing system and a non- pressurizing system with the change of soil quality, the systems are easily changed and a short construction period, a lower construction cost and less labor are achieved.
SOLUTION: A tunnel excavator has a controller 15a for a water feed pump 15, which is provided with a first control signal making means for a muddy water pressurizing system and a second control signal making means to perform drilling while controlling a water level in a hopper 10. A sensor such as a water pressure meter 25 detects a water pressure signal in a chamber 5 or a water level signal in the hopper, as separate or common water pressure signal(s), to be conveyed to the first and second control signal making means. A suction pump 21 carries sediment in the hopper 10, together with water, through a mud discharge pipe 18 to the outside of a partition wall. In the muddy water pressurizing system, mud discharge is performed while bypassing the suction pipe 21.

Minoru Tayama
Kiyoshi Tsuchiya
Yasuaki Ishikawa
Masaaki Miki
Ryoichi Arita

JP23310896A

February 12, 2002

September 03, 1996

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Hitachi Construction Machinery Co., Ltd.
Sankei Co., Ltd.

E21D9/13; E21D9/06; E21D9/08; E21D9/087; E21D9/10; E21D9/12; (IPC1-7): E21D9/06

JP60152799A
JP9132994A
JP2136196U
JP6356794U

Katsuichi Wakata

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