Shock-absorbing device for net body of guard fence

Abstract

There is provided a shock-absorbing device for a net body of a guard fence, capable of improving a net body's effectiveness of absorbing impact by enlarging the amount of deformation of the net body once the net body has been subjected to a force of impact due to rockfall, mudslide, avalanche or the like. A net body 4 has a net body turn-down portion 24 located on an edge portion thereof and formed by turning down oblique wire members 22 serving as wire members, and a net body intersecting portion 23 in which the oblique wire members 22 intersect with one another. The net body turn-down portion 24 or the net body intersecting portion 23 is linked, by means of a shock-absorbing rope member 40 and a shock-absorbing instrument 30, to an upper transverse rope member 11 or a longitudinal rope member 52, both of which serve as link receiving members of a guard fence 1. Once the net body 4 has been subjected to an impact energy due to rockfall or the like, the shock-absorbing instrument 30 will friction slide along the shock-absorbing rope member 40 due to the net body turn-down portion 24 or the net body intersecting portion 23, thereby absorbing the impact energy. In addition, the amount of deflection of the net body 4 becomes large as the shock-absorbing instrument 30 moves, thereby improving the effectiveness in absorbing the impact energy.

1 . A shock-absorbing device for a net body of a guard, said guard fence comprising: poles vertically installed at intervals; a net body provided between said poles; and a shock-absorbing instrument holding a shock-absorbing rope member,
 wherein said net body has a net body turn-down portion formed by turning down_wire members on an edge portion thereof, and a net body intersecting portion in which said wire members intersect with each other, said net body turn-down portion or said net body intersecting portion being linked to a linkage member provided on said guard fence other than said net body, using said shock-absorbing rope member and said shock-absorbing instrument, so that said shock-absorbing rope member is allowed to friction slide with respect to said shock-absorbing instrument as said net body moves, thereby absorbing a force of impact applied to said net body, and   wherein a shock-absorbing turn-back loop is formed by allowing said shock-absorbing instrument to hold an end portion of a shock-absorbing turn-back portion formed by turning back said shock-absorbing rope member, said shock-absorbing turn-back loop being linked to said linkage member, while said net body turn-down portion or said net body intersecting portion being fastened to said shock-absorbing turn-back loop.   
     
     
         2 . The shock-absorbing device for a net body of a guard fence according to  claim 1 , wherein said net body turn-down portion or said net body intersecting portion is inserted through and fastened to said shock-absorbing turn-back loop. 
     
     
         3 . The shock-absorbing device for a net body of a guard fence according to  claim 1 , wherein said shock-absorbing instrument is provided with a fastening portion to which said net body turn-down portion or said net body intersecting portion is fastened. 
     
     
         4 . A shock-absorbing device for a net body of a guard fence, said guard fence comprising: poles vertically installed at intervals; a net body provided between said poles; and a shock-absorbing instrument holding a shock-absorbing rope member,
 wherein said net body has a net body turn-down portion formed by turning down_wire members on an edge portion thereof, and a net body intersecting portion in which said wire members intersect with each other, said net body turn-down portion or said net body intersecting portion being linked to a linkage member provided on said guard fence other than said net body, using said shock-absorbing rope member and said shock-absorbing instrument, so that said shock-absorbing rope member is allowed to friction slide with respect to said shock-absorbing instrument as said net body moves, thereby absorbing a force of impact applied to said net body, and   wherein a loop is formed by curling back said shock-absorbing rope member toward itself, and a portion in which said shock-absorbing rope member is folded is held by said shock-absorbing instrument, while said loop couples said linkage member with said shock-absorbing turn-back portion or said net body intersecting portion.   
     
     
         5 . The shock-absorbing device for a net body of a guard fence according to  claim 4 , wherein said shock-absorbing turn-back portion or said net body intersecting portion is inserted through said loop. 
     
     
         6 . A shock-absorbing device for a net body of a guard fence, said guard fence comprising: poles vertically installed at intervals; a net body provided between said poles; and a shock-absorbing instrument holding a shock-absorbing rope member,
 wherein said net body has a net body turn-down portion formed by turning down wires members on an edge portion thereof, and a net body intersecting portion in which said wires intersect with each other, said net body turn-down portion or said net body intersecting portion being linked to a linkage member provided on said guard fence other than said net body, using said shock-absorbing rope member and said shock-absorbing instrument, so that said shock-absorbing rope member is allowed to friction slide with respect to said shock-absorbing instrument as said net body moves, thereby absorbing a force of impact applied to said net body, and   wherein said shock-absorbing rope member is inserted through mesh patterns of a plurality of said net body turn-down portions or said net body intersecting portions, followed by turning back two end portions of said shock-absorbing rope member in opposite directions and allowing respective turn-back portions to be fastened to a linkage portion of said guard fence, while said end portions arranged in opposite directions being laid one on top of another to form an overlapping portion held by said shock-absorbing instrument.   
     
     
         7 . A shock-absorbing device for a net body of a guard fence, said guard fence comprising: poles vertically installed at intervals; a net body provided between said poles; and a shock-absorbing instrument holding a shock-absorbing rope member,
 wherein said net body has a net body turn-down portion formed by turning down wire members on an edge portion thereof, and a net body intersecting portion in which said wire members intersect with each other, said net body turn-down portion or said net body intersecting portion being linked to a linkage member provided on said guard fence other than said net body, using said shock-absorbing rope member and said shock-absorbing instrument, so that said shock-absorbing rope member is allowed to friction slide with respect to said shock-absorbing instrument as said net body moves, thereby absorbing a force of impact applied to said net body, and   wherein said shock-absorbing rope member is inserted through mesh patterns of a plurality of said net body turn-down portions or said net body intersecting portions, and   wherein said linkage member of said guard fence is provided with said shock-absorbing instrument, corresponding to two end portions of said shock-absorbing rope member, respectively, thereby allowing said shock-absorbing instrument on both ends to hold said two end portions of said shock-absorbing rope member, respectively.   
     
     
         8 . A shock-absorbing device for a net body of a guard fence, said guard fence comprising: poles vertically installed at intervals; a net body provided between said poles; and a shock-absorbing instrument holding a shock-absorbing rope member,
 wherein said net body has a net body turn-down portion formed by turning down wire members on an edge portion thereof, and a net body intersecting portion in which said wire members intersect with each other, said net body turn-down portion or said net body intersecting portion being linked to a linkage member provided on said guard fence other than said net body, using said shock-absorbing rope member and said shock-absorbing instrument, so that said shock-absorbing rope member is allowed to friction slide with respect to said shock-absorbing instrument as said net body moves, thereby absorbing a force of impact applied to said net body, and   wherein said linkage member is a pair of linking rope members provided on said guard fence and distant from each other, and a turn-back portion formed by turning back a front end portion of said shock-absorbing rope member is movably fastened to one and an other linking rope members of said pair of said linking rope members, respectively, and   wherein said net body turn-back portion or said net body intersecting portion is linked to said front end portion, and an extra length portion is provided on an other side of said shock-absorbing rope member, said extra length portions of one and an other shock-absorbing rope members being laid one on top of another to form an overlapping portion held by said shock-absorbing instrument.   
     
     
         9 . The shock-absorbing device for a net body of a guard fence according to  claim 1 , wherein said linkage member is said linking rope member provided on said guard fence. 
     
     
         10 . The shock-absorbing device for a net body of a guard fence according to  claim 8 , wherein said linking rope member is a transverse rope member provided between said poles. 
     
     
         11 . The shock-absorbing device for a net body of a guard fence according to  claim 9 , wherein said linking rope member is said transverse rope member provided between said poles. 
     
     
         12 . The shock-absorbing device for a net body of a guard fence according to  claim 1 , wherein a stopper to be fastened to said shock-absorbing instrument is provided on the end portion of said shock-absorbing rope member. 
     
     
         13 . The shock-absorbing device for a net body of a guard fence according to  claim 2 , wherein said linkage member is said linking rope member provided on said guard fence. 
     
     
         14 . The shock-absorbing device for a net body of a guard fence according to  claim 4 , wherein said linkage member is said linking rope member provided on said guard fence. 
     
     
         15 . The shock-absorbing device for a net body of a guard fence according to  claim 13 , wherein said linking rope member is said transverse rope member provided between said poles. 
     
     
         16 . The shock-absorbing device for a net body of a guard fence according to  claim 14 , wherein said linking rope member is said transverse rope member provided between said poles. 
     
     
         17 . The shock-absorbing device for a net body of a guard fence according to  claim 4 , wherein a stopper to be fastened to said shock-absorbing instrument is provided on the end portion of said shock-absorbing rope member. 
     
     
         18 . The shock-absorbing device for a net body of a guard fence according to  claim 6 , wherein a stopper to be fastened to said shock-absorbing instrument is provided on the end portion of said shock-absorbing rope member. 
     
     
         19 . The shock-absorbing device for a net body of a guard fence according to  claim 7 , wherein a stopper to be fastened to said shock-absorbing instrument is provided on the end portion of said shock-absorbing rope member. 
     
     
         20 . The shock-absorbing device for a net body of a guard fence according to  claim 8 , wherein a stopper to be fastened to said shock-absorbing instrument is provided on the end portion of said shock-absorbing rope member.