Hydraulic and earth engineering – Earth treatment or control – Ground stabilization or reinforcement
Patent
1981-11-18
1983-08-16
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Ground stabilization or reinforcement
E21D 1544
Patent
active
043988512
ABSTRACT:
A system for advancing timbering in underground mines comprises a number of longwall supporting timbering units which are pushed forward hydraulically in accordance with the progress of the working obtained by a mining machine, along with a conveyer device. Each timbering unit is equipped with an electronic control device which is connected to a computer in a control room. The control units are connected in series via control lines in such a manner that the control data delivered by the computer and the acknowledgment data delivered by the respective addressed control unit are passed on via first receivers and transmitters and via second transmitters and receivers, respectively, from one control unit to the immediately adjacent one in ascending or descending sequence back to the computer.
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patent: 4132079 (1979-01-01), Ito et al.
patent: 4134270 (1979-01-01), Small et al.
patent: 4146271 (1979-03-01), Ward et al.
patent: 4330154 (1982-05-01), Harris
Geuns Guy
Rotzer Georg
Siemens Aktiengesellschaft
Taylor Dennis L.
LandOfFree
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