Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
Patent
1994-09-13
1996-06-25
Bagnell, David J.
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
Boring
299 13, 356153, E21D 906, G01B 1127
Patent
active
055294375
ABSTRACT:
A guidance system and method for keeping a tunnel boring, machine continuously on a plan line. The guidance system requires no machine operator calculations and provides the boring machine operator with a graphic display of past, present and projected positions of the boring machine from a horizontal and vertical perspective. The system uses a laser beam transmitter placed to the rear of the tunnel boring machine along with a front opaque target with a horizontal and vertical cross-hair and a rear transparent target with a horizontal and vertical cross-hair. The front and rear targets are disposed on the front and the rear of the boring machine. Also, an on-board programmable computer is installed on the boring machine for imputing data as to horizontal offset and vertical offset readings from the front and rear targets as the boring machine advances forward. Typically the boring machine moves forward in increments of four feet with offset readings taken by the operator after each increment. The offsets are measured in feet up to two decimal places with the readings based on measured positions being either right or left of the vertical cross-hair and above or below the horizontal cross-hair of the front and rear targets. Further, the on-board computer is programmed to store and provide a laser alignment check for verifying laser setup information and to graphically display alignment errors during a change in the setup of the laser beam transmitter by a survey crew.
REFERENCES:
patent: 3321248 (1967-05-01), Williamson et al.
patent: 3484136 (1969-12-01), Colson
patent: 4392744 (1983-07-01), Tatsuhama et al.
Filipowski Mark S.
Shank Michael L.
Wardwell Steven R.
Bagnell David J.
Crabtree Edwin H.
Margolis Donald W.
Pizarro Ramon L.
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