CONNECTING METAL FITTING OF ROCK FALL PREVENTIVE NET ROPE, ROCK FALL PREVENTIVE CONSTRUCTION METHOD, AND ROCK FALL PREVENTION CONTROL SYSTEM

摘要

PROBLEM TO BE SOLVED: To cope with change in power relationship to fix a huge stone even when it occurs due to a surrounding condition by interposing a cushioning part to extend a rope between a net part and an anchor bolt when tensile force not less than a fixed quantity is applied to the rope. ;SOLUTION: The rope end positioned around a net part covering a rock A of a rock fall preventive object is connected to an anchor bolt 2 fixed to bedrock, and a cushioning connecting metal fitting 4 is interposed between a bolt 2 and the net part. Next, a rope being an end part of the net part and a fastening installing rope connected to the bolt 2 are positioned in a recessed strip of the metal fitting 4, and a bolt part of a sandwiching bolt body is inserted into an inserting hole, and a nut is screw-fitted and fastened, and both ropes and sandwiched by constant sandwiching force. Next, a condition of the rock A changes, and when tensile force not less than sandwiching frictional force by the metal fitting 4 is applied to both ropes, since a sandwiching place of both ropes moves in a condition of holding constant sandwiching force, it can cope with a change in the power relationship of the rock A.;COPYRIGHT: (C)1998,JPO