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EXCAVATION METHOD FOR TUNNEL,SHAFTS AND EXCAVATION IN ROCK USING WATER JET CUTTING AND SYSTEM FOR SUCH EXCAVATION.
EXCAVATION METHOD FOR TUNNEL,SHAFTS AND EXCAVATION IN ROCK USING WATER JET CUTTING AND SYSTEM FOR SUCH EXCAVATION.
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机译：射流切割法在岩石隧道，竖井，岩体中的开挖方法及这种开挖系统。
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The excavation method for tunnel, shafts and rocks using water jet cutting starts with making a groove at the bottom most part of the cutting face. Then nozzles are located on the cutting face to start cutting simultaneously. A vertical nozzle is fixed into the rock face through said groove. Vertical nozzle starts cutting rock face ahead of horizontal nozzle, at a predetermined distance depending upon the nature of rock face. Horizontal nozzle cuts rock face at an offset to vertical nozzle and weakens rock mass for breaking. Excavator unit knocks off weakened rock mass from bottom to upward. Nozzle sizes are chosen between 1.1 mm to 1.8 mm depending on the nature of the rock, but both nozzles are used simultaneously. Excavation method alternatively comprises of fixing plurality of nozzles horizontally on the cutter head. Nozzles are fixed to suit nature of rock at the cutting face. A grid pattern is made on the cutting face for both the nozzles fixed horizontaliy to start cutting operation simultaneously on the full cutting face, resulting in pre- weakening of the rock mass. Excavator unit knocks off the pre- weakened rock mass. Nozzle sizes are chosen between 1.1 mm to 1.8 mm depending on the nature of rock, but one or two nozzles are used at a given time. Excavation system comprises a movably and statically balanced nozzle- holding arm and a cutter head fitted at the arm front. Plurality of nozzles, are fixed in .the said cutter head with rigid lances. One nozzle in the horizontal direction forces water jet normal to the cutting face. Another nozzle kept in vertical direction forces water jet from bottom of cutting face for pre-weakening of rock mass. Excavator unit knocks off pre-weakened rock mass. Nozzle holding arm has swing motion both in vertical and horizontal direction effected by servomotors, which are controlled by CNC, drives for controlling fine feed movements. The operation of the nozzle is flexible, either in both directions simultaneously or one at a time with suitable control valves.
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