Mining or in situ disintegration of hard material – Automatic control; signaling or indicating – Of hard material disintegrating machine
Patent
1976-05-17
1977-08-09
Purser, Ernest R.
Mining or in situ disintegration of hard material
Automatic control; signaling or indicating
Of hard material disintegrating machine
61 84, 73155, 175 48, 299 18, E21D 904, E21D 912
Patent
active
040406660
ABSTRACT:
An apparatus and method for excavating tunnels with a shield and slurry while detecting and preventing excess excavation in high water content soft ground wherein, in each of feeding system of slurry to tunnel face and discharging system of a mixture of slurry and excavated soil or the like as well as gushing water from the tunnel face out of working area, the respective volumes of the slurry and mixture passing through the respective systems are measured in positions close to the tunnel face, the volume of the excavated soil or the like is determined with the difference between both volumes while the amount of propelling a tunnelling machine is determined as an excavated space volume of the tunnel, the respective values of the excavated soil volume and excavated space volume are compared with each other, whereby the amount of propelling the machine, fed amount of the slurry or discharging amount of the mixture can be properly adjusted so that the difference between said values will be made substantially zero.
REFERENCES:
patent: 3552502 (1971-01-01), Wilson
patent: 3778107 (1973-12-01), Haspert
patent: 3830545 (1974-08-01), Sugden
Ishiwata Kazuhiko
Uchida Yoshiaki
Purser Ernest R.
Tekken Kensetu Co. Ltd.
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