JP4115422B2 - Protective fence - Google Patents

Description

The present invention, snow, falling rocks, relates to a safety barrier for receiving the wind, etc., particularly, it relates to a safety barrier stretched over a network comprising a synthetic resin between the trees.

  Conventionally, protective fences have been known that are constructed on slopes of mountainsides and receive falling rocks and snow, etc., to prevent falling and inflowing on roads etc. A protective fence such as a rock fall (for example, Patent Document 1) in which a pipe strut that is drilled and built in the vertical hole is provided side by side and a wire mesh is stretched along with a plurality of cables on each pipe strut is proposed. For this, a wire mesh is used.

  Also, related to the net used for the protective surface, the protective net is made of steel or wire with rigid wires attached in parallel, knitted on the net with rigid wires, or a combination of multiple horizontal rope materials and wire mesh Etc., including various known nets (for example, Patent Document 2).

  As in the above-described prior art, a protective body using this type of net protects roads and the like from falling rocks by combining a wire rope and a steel net.

  However, in the case of using a steel wire rope or net, since the member itself is heavy, a heavy machine for installation is required, there is a problem that the construction range is limited, the construction period is prolonged, and the construction cost is increased. And since the protection body provided for rock fall protection is often provided on the slope of a mountain unsuitable for heavy machinery use, the member is heavy in the construction of providing the protection body on such a mountain slope. And the carrying-in operation | work becomes complicated and there exists a problem inferior to workability.

  By the way, when performing various constructions in mountainous areas, a temporary protective body may be required only during the construction period, and it may be necessary to remove the protective body after the construction is completed. On the other hand, with conventional protective fences, when repairs are necessary due to falling rocks, etc., or when the service life has passed, repairs and replacement of nets etc. are performed, and they are used for temporary construction. Is unsuitable.

Therefore, in a protective body having a surface made of a mesh, the mesh is made of a synthetic resin. Therefore, a protective fence (for example, Patent Document 3) having a fixing means for fixing the net between standing trees is proposed.
JP-A-7-197423 JP 2000-273727 A (paragraph 0011) JP 2003-261910 A

  A protective fence using a net made of the above synthetic resin has excellent workability, simplifies the construction method, enables construction at a low price, and facilitates replacement of the net.

  By the way, in the case where both sides of the net are connected between natural trees as described above, the center of the net is easily bent, and there is a problem that the installation work becomes complicated. In addition, a plurality of workers, such as a worker for attaching a net to a standing tree and a worker supporting the center of the net to be lifted, are required, resulting in poor workability.

  Therefore, an object of the present invention is to provide a protective fence that can easily carry out a net installation work and has excellent workability, and a construction method thereof.

The invention of claim 1 is a protective fence in which a net made of a synthetic resin is stretched between standing trees, an intermediate standing tree having a distance from the rear surface of the net, and a connecting means for connecting the top and bottom of the net to the standing tree. A horizontal rope material for support is provided between the standing trees , the mesh is suspended from the horizontal rope material for support, and the intermediate standing tree having a distance from the rear surface of the net is spaced from the net. Connected by the connecting means .

  According to a second aspect of the present invention, the net is suspended by a suspension member that is movable along the supporting horizontal rope member.

According to a third aspect of the present invention, the supporting horizontal rope member is fixed to a support body outside the standing tree on which the net is stretched.

  According to the structure of Claim 1, the net | network can be simply installed by preventing the slack of the upper part side of a net | network by hanging a net | network on the horizontal rope material for support.

  Further, according to the configuration of claim 2, a horizontal rope material for support is provided between the standing trees, the net is hung by the hanging member, and the hanging member is moved along the horizontal rope material for support, Can be expanded and installed.

Moreover, according to the structure of Claim 1 , since a net | network is connected with a standing tree at least four places on both sides up and down between standing trees, when a falling rock is received, an impact can be absorbed efficiently by the deformation | transformation of a net | network.

Moreover, according to the structure of Claim 1 , even if the standing tree and the net are separated, when a falling stone is received by the net, the net moves backward, the net follows the separated standing tree, and the net is deformed between the standing trees. Absorbs shock. Moreover, it is not necessary to bother the supporting horizontal rope material to the plurality of standing trees arranged naturally, and the construction becomes easy.

In addition, according to the configuration of claim 3 , the supporting rope can be easily and easily provided, and the tension of the supporting rope is not always applied to the standing tree with a net. Sometimes it can effectively support the net.

  Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention. In each embodiment, by employing a guard fence different from the conventional one, a guard fence that has not existed in the past can be obtained, and each of the guard fences will be described.

  Hereinafter, Embodiment 1 of the guard fence of the present invention will be described with reference to FIGS. As shown in FIG. 1, the protective fence 1 includes a net 11 and a plurality of standing trees 21 provided between the nets 11, and the net 11 forms a protective surface 11M. The net 11 has a substantially rectangular shape on the front.

  As shown in FIGS. 5 to 7, the net 11 is a through-type knotless net made of a synthetic resin. For example, a plurality of fiber yarns 12 and 12A made of a synthetic resin are twisted to form the wires 13 and 13A. These wire rods 13 and 13A have a crossing direction, and are fixed to each other by a crossing portion 14 by a knotless bar. There is a Russell type for the knotless net, but a penetration type is preferably used. FIG. 5 is an explanatory view for explaining the structure. As shown in FIG. 5, at the intersecting portion 14 of the wire rods 13 and 13A, the ring portion 15 formed by a gap between the fiber yarns 12 and 12 of the one wire rod 13 is shown. By inserting the fiber yarns 12A and 12A of the other wire rod 13A from the front and back directions, and twisting the fiber yarns 12 and 12A at the crossing portion 14 and closing the ring portions 15 and 15A, both the wire rods 13 and 13A are inserted. Is fixed at the intersection 14. Reference numeral 15A denotes an annular portion formed by a gap between the fiber yarns 12A and 12A at the intersecting portion 14. 5 is shown with the ring portions 15 and 15A opened for explanation, but in the actual net 11, the ring portions 15 and 15A have a closed structure.

  Further, the net 11 has a substantially rectangular shape, and a rope material 16 is provided on the four edges of the net 11. Further, as shown in FIGS. 6 and 7, the end portions of the wires 13 and 13A in the rope material 16 are folded back, and the wires 13 and 13A are fixed to each other by overlapping portions 18 of the wires 13 and 13A. , 13A is disposed between the rope members 16.

  The synthetic resin used for the net 11 is preferably high-density polyethylene or the like, and when the high-density polyethylene is used, the specific gravity of the net 11 is 0.94 to 0.96. If necessary, the weather resistance can be improved by using carbon black or an ultraviolet absorber for the net 11.

  The guard fence 1 has a net 11 stretched between standing trees 21 and 21 on a mountain slope, and is provided by selecting a place where a plurality of standing trees 21, 21. A place where two standing trees 21A and 21A and two or three middle standing trees 21 and 21 are arranged is preferable.

  The standing trees 21A and 21A on both sides are columnar supports, and artificial structures other than standing trees can be used for the supports, but the standing trees 21A and 21A substantially correspond to the height of the net 11. Then, the supporting horizontal rope member 22 is installed. In this case, the supporting horizontal rope member 22 is preferably constructed in a state where a predetermined tension is maintained. The supporting horizontal rope member 22 is preferably a rope coated with a resin such as vinyl in terms of protecting the standing tree 21A. Further, the standing band 21A is provided with a protective band 23 serving as a protective cover. Wrapped around the protective band 23, the end portion of the supporting horizontal rope member 22 is wound on the protective band member 23, the end portion is placed along the supporting horizontal rope member 22, and both are used as end fixing means. It is clamped by the wire clip 24, and thereby the supporting horizontal rope material 22 is fixed to the standing tree 21A. In the explanatory side view of FIG. 4, the standing tree 21 </ b> A is illustrated in the upper part, and the standing tree 21 is illustrated in the lower part.

  A net 11 is suspended from the supporting horizontal rope member 22 by a plurality of hanging members 25, and the hanging member 25 is a freely rotatable pulley 26 that is movably mounted on the supporting horizontal rope member 22. And a ring body 27 connected to the rope member 16 at the upper part of the net 11, and a shack 28 as a connecting member for connecting the lower hook portion 26A of the pulley 26 and the ring body 27. The ring body 27 is flexible. For example, it is made of an endless rope or the like, and is extended so that the wire rods of the ring body 27 are overlapped with each other. One end portion 27A is wound around the rope member 16, and the other end is wrapped in the loop of the wound end portion 27A. The end 27B on the side is inserted, and the end 27B is passed through the shackle 28. Then, the hanging members 25 are provided on the rope member 16 at the upper part of the net 11 at substantially constant intervals.

  Further, in the intermediate trees 21, 21, and 21, the upper and lower sides of the net 11 are connected to the trees 21, 21, and 21 by a connecting belt 31 that is a connecting means. As shown in FIG. 9, the connecting belt 31 is made of, for example, a resin fiber fabric and has ring portions 31A and 31A at both ends. The portions 21A, 21A and the net 11 are connected by a shackle 32 which is a connecting member. In this case, as shown in FIG. 2 and FIG. 3, when there is a gap K between the standing tree 21 and the supporting horizontal rope member 22, the supporting rope member 22 does not bend in the front-rear direction while keeping this gap K. The standing tree 21 and the net 11 are connected with the connecting belt 31 stretched to the extent. Further, the lower part of the net 11 is fixed to the ground by a fixing auxiliary anchor 33. For the connecting belt 31, a belt having a predetermined tensile stress that resists the tensile force applied when falling rocks is selected.

  The net 11 has a width of about 7 meters. If necessary, as shown in FIG. 1, a plurality of nets 11 are connected by a connecting portion 11A and used in the connecting portion 11A. The rope members 16 and 16 at the end of 11 are knitted and connected with a rope or the like. Further, a retaining rope member 34 connected to the rope member 16 is provided on the upper end of the width direction of the mesh 11, and this retaining rope member 34 is made of the same synthetic resin material as the rope member 16 of the mesh 11. The end portion of the holding rope member 34 is wound around the protective band 23 and fixed.

Next, the construction method of the protective fence 1 will be described. First, the supporting horizontal rope member 22 is provided with a predetermined tension between the standing trees 21A, 21A on both sides. In this case, if the supporting horizontal rope member 22 is fixed to one standing tree 21A and then the supporting horizontal rope member 22 is fixed to the other standing tree 21A, a minimum of one person can work. A plurality of pulleys 26 are passed through the supporting horizontal rope member 22 in advance. Then, in order from the width direction end side of the net 11, the upper rope member 16 is connected to the pulley 26 by the ring body 27 and the shackle 28, and at the same time, the net 11 is spread along the supporting horizontal rope member 22 by the pulley 26. Go. Note that the net 11 may be expanded after all the suspension members 25 are attached. When the net 11 is spread between the standing trees 21, 21, 21 in this way, the upper and lower sides of the net 11 are connected to the standing trees 21, 21, 21 by the connecting belt 31. Therefore, the supporting horizontal rope material 22 is attached to each side, the net 11 is suspended from the supporting horizontal rope material 22 by the hanging member 25 one by one, and the hanging member 25 is extended along the supporting horizontal rope material 22. Since the net 11 is expanded by moving, the work can be performed with the minimum necessary number of people.
In the protective fence 1 thus provided, when falling rocks or avalanches are received between the standing trees 21, 21, the net 11 mainly connects the upper and lower connecting belts 31, 31, 31, 31 of the standing trees 21, 21 on both sides. Therefore, the net 11 between the standing trees 21 and 21 is efficiently deformed, and this deformation can absorb the impact force of falling rocks. In addition, since the structure in which the belts 31, 31, 31, 31 are mainly constrained at four locations is adopted, even if there is a gap S between the net 11 and the standing tree 21 in the state before receiving the falling rock, There is no hindrance, and you can effectively use the natural standing trees 21

Thus, in the present embodiment, corresponding to claim 1, in the protective fence in which the net 11 made of synthetic resin is stretched between the standing trees 21, 21, And a connecting means for connecting the top and bottom of the net 11 to the standing tree 11, and a supporting horizontal rope material 22 is provided between the standing trees 21 , 21, and the supporting rope 11 is suspended from the supporting horizontal rope material 22. By hanging the net 11 on the horizontal rope member 22, it is possible to prevent the slack on the upper side of the net 11 and install the net 11 simply.

  In this way, in this embodiment, the net 11 is suspended by the suspension member 25 that can move along the supporting horizontal rope member 22 in accordance with the second aspect. By providing the horizontal rope member 22, suspending the net 11 by the suspending member 25, and moving the suspending member 25 along the supporting horizontal rope member 22, the net 11 can be spread and installed.

In this way, in this embodiment, corresponding to claim 1 , the belt 11 for connecting the upper and lower sides of the mesh 11 to the standing tree 21 is provided, so that at least the mesh 11 is between the standing trees 21 and 21. When it is connected to the standing trees 21 and 21 at four locations on both sides, and receives a fallen rock, it can absorb the impact efficiently by the deformation of the net 11.

As described above, in this embodiment, corresponding to claim 1, the intermediate tree 21 having the interval K and the rear surface of the net 11 and the net 11 are separated by the connecting belt 31 as connecting means with the interval K therebetween. Even if the standing tree 21 and the net 11 are separated from each other, even if the net 11 receives a falling rock, the net 11 retreats, the net 11 moves along the separated standing tree 21, and the net 11 is between the standing trees 21 and 21. Deforms and absorbs shock. In addition, it is not necessary to bother the supporting horizontal rope material 22 to the plurality of standing trees 21 that are naturally arranged, and the construction becomes easy.

In this way, in this embodiment, corresponding to claim 3 , since the supporting horizontal rope member 22 is fixed to the standing tree 21A which is the supporting body outside the standing tree 21 with the net 11 stretched, the supporting horizontal rope The material 22 can be provided easily and easily, and the standing tree 21 with the net 11 stretched is not always subjected to the tension of the supporting horizontal rope material 22, so that the net 11 can be effectively supported when falling rocks. .

Further, in this manner, in the present embodiment, in the method of constructing the proof Mamorusaku. 1, between the trees 21, 21 provided a support for horizontal rope materials 22, the portion member 25 suspending the net 11 to the supporting horizontal rope materials 22 After the suspension, the net 11 is moved along the supporting horizontal rope material 22 and the net 11 is arranged between the standing trees 21 and 21, so that each process can be performed separately, with the minimum number of workers required. Work can be done.

  Further, as an effect of the embodiment, since the hanging member 25 is connected to the rope member 16 positioned on the four sides of the net 11, a stable hanging state can be obtained. In addition, since the shackle 28 which is a connecting member that can be connected and disconnected can be used for the suspending means 25, it is possible to easily perform the case where the mesh 11 needs to be replaced.

  FIG. 9 shows a second embodiment of the present invention. The same reference numerals are given to the same parts as those in the first embodiment, and detailed description thereof will be omitted. In this example, two nets 11 are stacked one after the other. In addition, it is provided between the standing trees 21 and 21, and the impact absorbing effect by the nets 11 and 11 can be improved.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, the support may be an artificial structure such as a steel support other than the standing tree 21A. Moreover, if the number of standing trees provided with a net is two or more, it can be selected as appropriate. Further, three or more nets may be overlapped and used.

It is a front view of the principal part of the guard fence which shows Example 1 of this invention. It is a top view of the principal part of a protection fence same as the above. It is a top view of a protection fence same as the above. It is side explanatory drawing of a protection fence same as the above. It is a front explanatory drawing explaining the structure of a net | network same as the above. FIG. 2 is a plan development view of an end portion of a net, showing a net and a rope material. FIG. 7A is a side view of a net partly in section, FIG. 7A shows a state in which rope materials are overlapped on the end side of the net, and FIG. 7B overlaps by folding the end of the net. The state which formed the part is shown. FIG. 8A is a front view, and FIG. 8B is a side view. It is a front view of a connection means same as the above. It is side surface explanatory drawing of the protection fence which shows Example 2 of this invention.

Explanation of symbols

1 Guard fence
11 Net
21 Tachiki
21A Standing trees on both sides
22 Horizontal rope material for support
25 Hanging members
26 pulley
31 Connecting belt (connecting means)
K interval

Claims (3)

In a protective fence in which a net made of a synthetic resin is stretched between standing trees, an intermediate standing tree having an interval from the rear surface of the net, and a connecting means for connecting the top and bottom of the net to the standing tree, A horizontal rope member for support is provided, the net is suspended from the horizontal rope member for support, and the intermediate standing tree having a gap from the rear surface of the net and the net are connected by the connecting means with the gap therebetween. A protective fence characterized by that. The protective fence according to claim 1, wherein the net is suspended by a suspension member movable along the supporting lateral rope member. Claim 1 or 2 Symbol placement of fences, characterized in that fixed to the supporting horizontal rope materials from the outside of the support trees stretched over the network.

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