[Problem] To prevent cross-cable excess lengths from being caused to jut out toward the outside of an impact-absorbing fence, while cutting down on material costs and simplifying the work of assembling the impact-absorbing fence. [Solution] Provided is an impact-absorbing fence comprising a plurality of stanchions 10, cross cables 20 stretching between the plurality of stanchions 10, and cushioning devices 30A (30B) interposed between one end of the cross cables 20 and the stanchions 10, wherein the cross cables 20 have fixed ends 21 formed on one end thereof and excess lengths 22 formed on the other end thereof, and are provided extending with the fixed ends 21 of the cross cables 20 non-slidably fixed to one of adjacent stanchions 10, and the other ends of the cross cables 20 formed with the excess lengths slidably attached to the other of the adjacent stanchions 10 via the cushioning devices 30A (30B).
[Problem] To provide a buffer device for a guard fence and an attachment structure for a lateral rope and the buffer device with which it is possible to exert a stable buffering effect while preventing a surplus length part of the lateral rope from protruding outward from the guard fence. [Solution] A buffer device 30 comprising a friction sliding buffer 40 in which an insertion hole 42 and a holding hole 43 having a difference in diameter are provided side by side, a reversing guide body 50 that reverses a surplus length part 22 of a lateral rope 20, and a reversing spacer 60 located between the buffer 40 and the reversing guide body 50, wherein the buffer device 30 is configured such that the buffer device 30 is moored at an inner side surface of a support post 10, and that the buffer 40 holds the surplus length part 20 of the lateral rope 20 reversed inside the buffer device 30 in a manner that enables the surplus length part 22 of the lateral rope 20 to be routed toward the inside of the guard fence.
[Problem] To provide a rope connector for a trapping structure capable of reliably connecting two orthogonal rope materials while preventing sliding and/or strength reduction. [Solution] A rope connector 1 for a trapping structure according to the present invention is provided with two bearing plates 10 and a plurality of fasteners 20. The rope connector 1 is characterized in that: the bearing plates 10 each have a plate body 11, a single first groove 12 traversing the bottom surface of the plate body 11, two second grooves 12 extending from the outer circumference of the bottom surface of the plate body 11 toward the center of the bottom surface in a direction orthogonal to the first groove 11 and divided at the center of the bottom surface of the plate body 11, and a plurality of through holes 14 penetrating both surfaces of the plate body 11; the first groove 12 deepens from the outer circumference of the bottom surface of the plate body 11 toward the center; the second grooves 12 shallow from the outer circumference of the bottom surface of the plate body 11 toward the center; and a planar bearing hole 30 is configured by arranging the two bearing plates 10 with the bottom surfaces thereof facing each other and rotated relative to each other by 90 degrees, the planar bearing hole 30 being capable of bearing, on the inner circumferential surface thereof in a planar manner, rope materials B between the first groove 12 and the second grooves 13 facing each other.
[Problem] To provide an impact-absorbing fence with which it is possible to reduce the maximum impact force upon receiving an impact, and increase the safety performance of the impact-absorbing fence. [Solution] An impact-absorbing fence having a plurality of support columns 10, upper ropes 21 provided extending between the upper sections of adjacent support columns 10, impact-absorbing devices 30 provided to some of the upper ropes 21, and a protective net 20, said impact-absorbing fence comprising: a plurality of load-transferring ropes 23 that are independent in units of the support column 10 span and are horizontally strung between the upper sections of adjacent support columns 10; and a side reserve rope 24 that is connected between the upper section of an end support column 10b and a side anchor 40, wherein the load-transferring ropes 23 are horizontally strung between the upper sections of adjacent support pillars 10 with greater slack than the upper ropes 21.
[Problem] To be able to erect a plurality of supports at the same angle of inclination through a simple operation and to construct a fixed-shape protective net without being affected by changes in the pitch or changes in the undulations of a slope. [Solution] A protective fence comprises a plurality of supports 10 that are erected to be tiltable, a fixed-shape net panel 20, a mountain-side restraining rope 40, and an angle adjusting leg 30 that is interposed between the supports 10 and the mountain-side slope. The plurality of supports 10 are supported at the same angle of inclination by adjusting the extended length of the mountain-side restraining rope 40. The angle adjusting leg 30 is fixed at a mounting height corresponding to the angle of inclination of the supports 10 so that the inclination of the plurality of supports 10 toward the mountain side can be regulated by the mountain-side slope receiving the reaction force.
[Problem] To provide a permeation-type trapping structure that is capable of assuredly preventing scouring of a river bed 80 and erosion of a river bank 81 while preventing destruction of a sleeve net 40. [Solution] This permeation-type trapping structure is provided with a spillway net 20, and the sleeve net 40, wherein the mesh of the sleeve net 40 is finer than that of the spillway net 20.
[Problem] To improve assembly workability and enable a significant reduction in construction costs and construction time, and to improve damping performance. [Solution] Rear surface loop materials 60 are used, the rear surface loop materials 60 having a double rope structure and being formed into a loop shape by non-slidably fixing both end sections of a rope material having a length equal to or greater than double the span between rigid structures 30. Continuous bodies, in which a rear surface loop material 60 provided horizontally on the downhill side of the rigid structures 30 is anchored to an end ring 21 of terminal mounting ropes 26 and in which a capturing net 20 disposed on the uphill side and the rear surface loop material 60 disposed on the uphill side are made continuous with each other, are extended between the peripheral surfaces of a plurality of rigid structures 30, 30.
[Problem] To provide a net for catching a flowing-down object, said net being capable of taking full advantage of the strength of a net body by enhancing the impact-force dispersion performance. [Solution] A net for catching a flowing-down object according to the present invention is provided with a net body 20 and a plurality of terminal mounting ropes 30, wherein the net body 20 and the terminal mounting ropes 30 are configured by combining a plurality of single ropes 40 each having a terminal ring 41 on each end thereof and a plurality of relay/connection tools 50.
[Problem] To make it possible to convert an existing permeable erosion-control dam into a permeable erosion-control dam having high disaster reduction, without reinforcing a slit dam. [Solution] A permeable erosion-control dam provided with an erosion-control dam main body 10, a rigid-structure slit dam 20, and a net-form screen 30, wherein the screen 30 is disposed with a gap from the slit dam 20, and the left and right ends of the screen 30 are fixed and attached to the erosion-control dam main body 10.
[Problem] To provide a load bearing material that can simultaneously achieve suppressing local stress concentration in an outer pipe, ensuring high flexural strength, and reducing costs. [Solution] A load bearing material 10 that comprises a metal outer pipe 20, a plurality of inner pipes 30 disposed by being positioned in substantially concentric circles inside the outer pipe 20, and a filling material 40 that fills the outer pipe 20, and in which the plurality of inner pipes 30 deform into a flat shape before the outer pipe 20 deforms when a bending moment occurs, wherein a plurality of reinforcing materials 50 exhibiting a rod shape are disposed in positions on the outside of the plurality of inner pipes 30 that are separated from the inner pipes 30 and the outer pipe 20.
[Problem] To provide a protective structural body with a flexible structure that can disperse the energy of falling objects from an avalanche or the like while reducing the support force for the protective structural body by reducing the impact force transmitted to the protective structural body. [Solution] A protective structural body is made from a plurality of flexible energy dispersing members 10 in which openings are formed to allow the transmission of granules constituting a falling object, and a supporting means 20 that supports the energy dispersing members 10. The plurality of energy dispersing members 10, 10 are layered with a prescribed interval therebetween and the plurality of energy dispersing members 10, 10 are disposed in a direction that intersects with an inclined face 31.
[Problem] To provide a support post structure that can be constructed with a significant reduction in construction costs and construction time and that allows support posts to be easily replaced within a short time. [Solution] A support post structure provided with a support post 10, a base block 20 that is integrated with the bottom of the support post 10 so as to be detachable, and a plurality of anchors 40a, 40b that receive reaction force from the ground and couple to the base block 20, wherein the base block 20 is provided with a box 21, a solidification material 25, and a plurality of reinforcing guide tubes 30. A reinforced support pile is formed integrated with the base block 20 by filling the inside of the reinforcing guide tubes 30 with a solidifying fill material 41.
[Problem] To reduce the total length of a support post body while improving the yield strength with respect to the support force of the support post and the overturning moment. [Solution] A support post structure (20) which is used in a safety fence, is provided with a support post body (21) that projects to the ground, a pseudo columnar body (25) that extends the support post body (21), and a reinforced connecting portion (22) that is formed by embedding the lower portion of the support post body (21) in the upper portion of the uncured pseudo columnar body (25). The reinforced connecting part (22) is formed by spanning the upper region of the pseudo columnar body (25) centered on the part where the greatest bending moment and stress are applied.
[Problem] To hold posts at fixed positions while maintaining the postures of the posts by a simple structure. [Solution] A pair of mountain-side stay ropes (32, 32) having a V-shape is stretched between a mountain-side slope and the post head of each of posts (20), a pair of valley-side oblique ropes (33, 33) having an inverted V-shape is stretched between a valley-side slope and the post head of each of the posts (20), a net body (31) which constitutes a guard net is restrained by a plurality of valley-side oblique ropes (33, 33), and a plurality of mountain-side stay ropes (32, 32) and the plurality of valley-side oblique ropes (33, 33) are connected to the heads of the posts to thereby hold the posts (20) at fixed positions.
[Problem] To provide avalanche prevention equipment that can ensure stability of a slope while maintaining favorable stability of a piling structure and that can continue a high level of avalanche prevention functionality over a long period of time. [Solution] Avalanche prevention equipment comprises a protective net (20) that is disposed on a slope (10), and a plurality of piling structures (30) that are anchored on the slope (10) by anchors (40). The piling structure (30) is provided in a standing manner by having a ground plate (32, 33) of the same contact the top face of the protective net (20) and having the anchor (40) provide the reaction force, and the protective net (20) is anchored to the slope (10) by way of the piling structure (30) and the anchor (40).
[Problem] To simultaneously achieve both the improvement of the cushioning performance of an impact absorbing levee body and the downsizing of the impact absorbing levee body. [Solution] A cushioning continuous wall (30) having a flexible structure is disposed on an impact receiving surface (21) of a resistance body (20) formed from a reinforced embankment, the cushioning continuous wall (30) is anchored by an anchor means (40), and thereby the resistance area of the resistance body (20) when an impact is received is increased.
A binding tool with which multiple wire rods are crimped and which is designed for secure binding of the various wire rods even with long-term use. The tool is provided with a flat first binding member (10a) and a flat second binding member (20a). The first binding member (10a) and the second binding member (20a) each have a central section for covering multiple wire rods, a bendable first locking section (11, 21) extending from a first side of the central section, and a bendable second locking section (12, 22) extending from the second side of the central section on the side opposite to the first side. When the first binding member and the second binding member are crimped with multiple wire rods interposed therebetween, the first and second locking sections (11, 12) of the first binding member (10a) are bent so that the ends thereof each contact the outer surface of the second binding member (20a) and are bent so that each contacts the outer surface of the first binding member (10a).
[Problem] To improve work efficiency and improve work safety, reduce the load burden for the anchor and rope after construction, and quickly and economically support, in whole or in part, a slope. [Solution] A bearing anchor (50) that has both the load fixing function of a net (20) and the anchoring function of a plurality of ropes (30, 31) is used. After fixing the net (20), which covers a slope (10), by way of the bearing anchor (50), the ropes (30, 31) are arranged among the plurality of bearing anchors (50) for reinforcement. While transmitting the load acting upon a portion of the ropes (30, 31) over the entire rope, the load is supported by dispersing the same among a plurality of anchors (40).
[Problem] To provide a protective dam body concurrently capable of reducing cost, widening the transmission range of impact in order to increase protective performance, and reducing the size of the dam body main body. [Solution] The present invention is provided with a dam body main body (20) and a semihard shock-absorbing restraint layer (30), the shock-absorbing restraint layer (30) being configured of a plurality of impact-receiving bodies (35) accommodating a hard shock-absorbing material (32) in a horizontally long restraint cage (31). The gap between adjacent impact-receiving bodies (35) is connected with a connecting material (34). When an impact is received, the shock is transmitted to the dam body main body (20) via the shock-absorbing restraint layer (30), which changes hardness from a semihard substance to a hard substance, and attenuated.
[Problem] To provide a post structure in which a post stands tiltable in any direction, and, the post, when tilted when a safety fence receives falling rocks or the like, can return to the original standing status by itself after the fallen rocks or the like are removed. [Solution] A post structure (1) comprises: a ground plate (4) attached to the ground above a post anchor (2); a post (5); a universal joint (6) tiltably supporting the bottom of the post (5); a lower strike plate (9), a spring (10), and an upper strike plate (11) superimposed on the top of the post (5); a bolt (12) passing through a first bolt through-hole (9a) in the lower strike plate (9), the hollow portion of the spring (10), and a second bolt through-hole (11a) in the upper strike plate (11); a nut (13) screwed into the threaded portion of the bolt (12); and a rope (3) hanging between a first rope tether (12c) of the bolt (12) and prescribed locations (2a, 4a) in the vicinity of the bottom of the post. The post (5) is standing by way of the rope (3) being in a state of tension by tightening with the nut (13).
[Problem] To provide a protective surface structure which is a non-conventional structure obtained by combining deformable support surfaces and shock-absorbing members and therefore has excellent impact absorption effect. [Solution] In a protective surface structure provided with net bodies (4) supported by supporting columns (3), the net bodies (4) provided with wire nets (11) are deformable, and shock-absorbing bag bodies (21) filled with sand are arranged on the net bodies (4). Combination of the deformable net bodies (4) and the shock-absorbing bag bodies (21) can effectively absorb impact force by deformation of the shock-absorbing bag bodies (21) and deformation of the net bodies (4) when impact force by a falling rock or the like is applied. In this case, the sand in the shock-absorbing bag bodies (21) which have received the impact force is moved and the shock-absorbing bag bodies (21) are deformed to absorb the impact force. In addition, since the impact force is applied to the shock-absorbing bag bodies (21) and the net body (4) is thereafter deformed, the deformation of the net bodies (4) is less. Furthermore, each net body (4) is provided between the supporting columns (3, 3), thereby being capable of improving impact absorbing force of a protective fence.
Provided is a shock absorbing device for a netted body for a protective fence, this shock absorbing device being such that when an impact force acts due to a rock fall, a landslide, a snowslide, or the like, the netted body is made to deform by a large amount, with the result that the impact absorption effect by the netted body can be improved. The netted body (4) comprises netted body turnup sections (24) formed in such a way that oblique wires (22), which are in the wire category, are turned up in the edge sections; and netted body intersecting sections (23) at which the oblique wires (22) intersect with each other. The netted body turnup sections (24) and the netted body intersecting sections (23) are connected, by means of shock absorbing rope members (40) and shock absorbing implements (30), to an upper horizontal rope member (11) and vertical rope members (52), both of which are connected members of the protective fence (1). When impact energy is applied to the netted body (4) due to a rock fall or the like, then the netted body turnup sections (24) and the netted body intersecting sections (23) cause the shock absorbing implements (30) to slide under friction with respect to the shock absorbing rope members (40), resulting in the impact energy being absorbed. Furthermore, because the shock absorbing implements (30) move, the deflection amount of netted body (4) can be made large, with the result that the impact energy absorption effect can be improved.
Disclosed is a load bearing material with a high energy absorbing effect during deformation. Because a metal external tube (2) and a plurality of metallic internal steel tubes (3, 3A, 3B) arranged inside the external tube (2) are arranged by positioning the plurality of internal steel tubes (3, 3A, 3B), the yield strength is improved by the plurality of internal steel tubes (3, 3A, 3B). Moreover, when subjected to a load, the external tube (2) can deform due to the flattening deformation of the internal steel tubes (3, 3A, 3B), so the stress is not locally concentrated in the external tube (2), and the energy absorbing effect is improved. In addition, the plurality of internal steel tubes (3, 3A, 3B) can easily be positioned by filling the spaces between the inner surface (21) of the external tube (2) and the outer surfaces of the internal steel tubes with a filler material (4).
While inhibiting any change of the effective height of a guard net at rockfall, the trapping capability for falling rocks is improved to thereby attain an enhancement of safety. A safety net is provided between the bottom portion of a guard net and the ground so that at rockfall the safety net while maintaining the state of blocking any gap at an inferior area of the guard net allows an elongation deformation following any flexure deformation of the guard net.
To provide a shock-absorbing protective fence in which a sufficient height is kept and which has a high impact energy-damping efficiency. A shock-absorbing protective fence, in which protective nets are so provided as to be stretched between struts installed upright at predetermined intervals, characterized in that fence height-keeping members are disposed along the longitudinal direction of the protective nets, and when an impact force acts thereon, the fence height-keeping members are separated from the protective nets.
Provided is a withstand load material capable of improving the strength of a steel pipe to receive a compressive force in the longitudinal direction from an external force. The withstand load material comprises the steel pipe (2) and a steel rod (3) arranged in the steel pipe (2) for applying a tensile force in the longitudinal direction of the steel pipe (2). This steel pipe (2) is equipped with paired bearing plates (4, 4) at a spacing in the longitudinal direction, and the steel rod (3) has an elastic restoring force in the direction to enlarge the spacing between those bearing plates (4, 4), so that the tensile force can be applied in the longitudinal direction of the steel pipe (2) by the elastic restoring force to enlarge the spacing between the bearing plates (4, 4). When the compressive force in the longitudinal direction is applied to the steel pipe (2) by a bending moment, the tensile force of the steel rod (3) counters that compressive force so that the withstand load material (1) can be made strong against the load.
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