JP2007032032A - Guard fence and its construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective fence capable of easily performing the installation work of a support in a protective fence provided with a support standing upright so as to be tiltable, and a construction method thereof.
In a protective fence comprising a plurality of support columns 2L, 3 and 2R which can be tilted and a net 11 made of a synthetic resin stretched between the support columns 2L, 3 and 2R, adjacent columns 2L, 3 and 2R are provided with diagonal rope members 56 and 56 that connect the upper side and the lower side of the frame 2R, so that the distance between the supports 2L, 3 and 2R is maintained by the diagonal rope members 56 and 56, thereby stabilizing the net 11. It can be stretched between the struts 2L, 3 and 2R.
[Selection] Figure 1

Description

  It relates to a protective fence that is constructed on the slope of a mountainside, etc., and receives snow and rocks to prevent it from falling or flowing into roads.

  Conventionally, protective fences have been known that are constructed on slopes of mountainsides to prevent falling or inflowing on roads etc. by receiving falling rocks and snow, etc.For example, vertical holes are provided at intervals on slopes of mountainsides. A protective fence such as a falling rock is proposed in which pipe pillars that are drilled and built in this vertical hole are arranged side by side, and a multi-stage cable is attached to each of these pipe pillars together with a wire mesh, and a wire mesh is used for the protective surface. (For example, Patent Document 1).

  Also, related to the net used for the protective surface, the protective net is made of steel or wire or other rigid wire attached in parallel, knitted on the net with rigid wire, or a combination of multiple horizontal rope materials and wire mesh Etc., which include various known nets (Patent Gazette No. 0011) (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, and 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.

  Therefore, it is a protective fence in which a net made of synthetic resin is stretched between the columns, and the column is erected so that it can be tilted, and a holding rope device is installed between the upper part of the column and the ground on one side of the column. This is a protective fence provided with an extra length portion on the rope material of the reed rope device and provided with a shock absorber that slidably holds the extra length portion (for example, Patent Document 3).

In the guard fence of Patent Document 3, the net made of synthetic resin is more easily deformed than a net made of steel, etc., and has a large elongation rate until cutting. When a force of a predetermined level or more is applied to the support column from the net that has been absorbed and has received the falling rock, the extra length portion slides relative to the shock absorber, and the support column tilts to the other side. In this way, when the rock falls, the net deforms and stretches to the other side, and further, the strut tilts to the other side. Is effectively improved.
JP-A-7-197423 Japanese Patent Laid-Open No. 2000-273727 JP 2004-76275 A

  In the protective fence of the above-mentioned patent document 3, natural disasters such as falling rocks and avalanches can be suppressed by effectively receiving snow and avalanches by the protective fence constructed on the slope.

  By the way, the support column is erected so as to be tiltable, a holding rope device is provided between the upper portion of the support column and the ground on one side of the support column, and a synthetic resin net is stretched between adjacent support columns. Therefore, the tiltable support column is installed in a state of being balanced by the tension received from the stay lobe device and the tension received from the net. Therefore, the support rope device and the support before attaching the net are in an unstable state, and when installing, the net must be stretched while adjusting the tension of the reserve rope device, which requires complicated work on site. .

  Therefore, the present invention has an object to provide a protective fence that can be easily installed in a protective fence provided with a support column that can be tilted, and a construction method thereof. It aims at providing the protective fence which can absorb.

  The invention according to claim 1 is a protective fence comprising a plurality of support columns erected so as to be tiltable and a net made of synthetic resin stretched between the support columns, and obliquely connecting the upper side and the lower side of adjacent columns. Rope material is provided.

  Further, the invention of claim 2 is provided with a reserve rope device between the upper portion of the support column and the ground on one side of the support column, and an extra length portion is provided in the rope material of the reserve rope device. Is provided with a shock absorber for slidably gripping.

  According to a third aspect of the present invention, a horizontal rope member is provided between the struts, an extra length portion is provided on the horizontal rope member, and a shock absorber for slidably gripping the extra length portion is provided. .

  According to a fourth aspect of the present invention, the nets having different mesh sizes are overlapped and stretched between the columns.

  According to a fifth aspect of the present invention, in the construction method of the protective fence according to the first aspect, the post is erected, and the upper side and the lower side of the adjacent post are connected by the diagonal rope member, and then the post. This is a construction method in which the net is stretched between them.

  According to the structure of Claim 1, since the space | interval between support | pillars is hold | maintained by the diagonal rope material, a net | network can be stably stretched between support | pillars.

  Moreover, according to the structure of Claim 2, since the space | interval between support | pillars is hold | maintained by the diagonal rope material, a reserve rope apparatus can be installed stably.

  Moreover, according to the structure of Claim 3, since the space | interval between support | pillars is hold | maintained by the diagonal rope material, the horizontal rope material provided with the shock absorber can be installed stably.

  According to the configuration of claim 4, even when a plurality of nets are stretched, the distance between the support columns can be maintained, and even a small falling rock can be captured with a small mesh of nets. The impact force of falling rocks made thinner by the net can be absorbed by a large mesh net, and the impact force of falling rocks can be absorbed efficiently.

  Further, according to the configuration of the fifth aspect, since the net is stretched between the struts after the distance between the struts is held by the slant rope material, it is not necessary to hold the gap between the struts by the net, Installation work can be performed easily.

  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 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 and its construction method, an unprecedented guard fence and its construction method can be obtained, and the guard fence and its construction method will be described respectively.

  Hereinafter, a first embodiment of a protective body of the present invention will be described with reference to FIGS. As shown in the figure, the guard fence 1 has a plurality of intermediate struts 3, 3 arranged in parallel between terminal struts 2L, 2R arranged on both sides, and a net 11 between these struts 2L, 3, 3, 2R. Is provided. Note that one side of the protective fence 1 is a mountain side Y as an example.

  First, the structure of the net 11 will be described with reference to FIGS. 5 to 8. The net 11 is a through-type unconnected reinforcing net made of synthetic resin. For example, a plurality of fiber yarns 12 and 12A made of synthetic resin are twisted to form a wire 13. 13A, and these wire rods 13 and 13A are in a crossing direction, and are fixed to each other by a crossless portion 14 by a knot. 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 member 16 is provided on the edge of the net 11, and a metal ring 17 is provided on four sides of the rope member 16. 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 mesh 11 is preferably high-density polyethylene, and when the high-density polyethylene is used, the specific gravity of the mesh 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.

  Furthermore, as shown in FIG. 8, the nets 11 and 11 are used in combination with different lengths M and m of one side of the mesh (M> m) and different thicknesses of the wires 13 and 13A. The larger mesh net 11 uses thicker wires 13 and 13A than the smaller mesh net 11. For example, the length M of one side is 100 mm, and the length m of one side is 50 mm. Then, before the large net 11, the small net 11 is overlapped, that is, the plurality of nets 11, 11 are overlapped so that the small net 11 on the mountain side is positioned, and the columns 2L, 2R, Stretch between three. Further, the small net 11 of one mesh and the large nets 11 of the two meshes may be overlapped.

Next, the details of the columns 2L, 2R, 3 and their mounting structure will be described.
As shown in FIGS. 9 and 10, the columns 2 </ b> L, 2 </ b> R, 3 include a main body 21 made of a steel square pipe, and mesh locking portions 23, 23 are provided on the upper and lower sides of the main body 21, respectively. The rope member 16 and the like are locked to the mesh locking portions 23 and 23. Moreover, the support | pillars 2L and 2R of both sides are provided with the horizontal rope connection part 24 on the upper and lower sides of the support | pillar 3 side, and the intermediate | middle support | pillar 3 is provided with the horizontal rope material connection part 24 on the both right and left sides, respectively.

  Further, one side connecting portion 25 for the one side holding rope is provided at the front upper part of the support columns 2L, 2R, 3, and the left supporting column 2L is provided on the outer side (right side) of the guard fence with the outer connecting portion for the outer holding rope. 26 is provided, and the right support column 2R is provided with an outer connecting portion 26 for an outer retaining rope on the outer side (left side) of the protective fence. The locking portion 23 and the connecting portions 24, 25, and 26 have holes in the plate material.

  A support member 31 for the support is provided at an installation location such as the slope 101. As shown in FIGS. 11 to 12, the mounting member 31 is made of metal or the like, and integrally includes a base portion 32 and a connection receiving portion 33 that rotatably connects the support columns 2L, 2R, and 3. The connection receiving portion 33 has a pair of arm portions 34 and 34 standing on the base portion 32 with a space therebetween, and the lower portions of the columns 2L, 2R and 3 are inserted between the lower portions of the arm portions 34 and 34. At the same time, a bolt 36 serving as a pivot is inserted into the lower hole 22 and the holes 34A and 34A of both arm portions 34 and 34, whereby the lower portions of the support columns 2L, 2R and 3 are rotatably connected to the mounting member 31. To do. The base portion 32 is fixed to an installation surface such as the inclined surface 101 by a plurality of lock bolts 38 serving as anchors. Long holes 32A at different positions on the left and right are formed on the left and right sides of the base portion 32. The long holes 32A are formed to be long in the left-right direction and are inserted into the holes 39A of the anchor plate 39. Is inserted into the elongated hole 32A. Therefore, the position of the lock bolt 38 in the left-right direction can be adjusted by the long hole 32A.

  In addition, in a state where the lower part is rotatably connected to the mounting member, there is a gap between the lower ends of the support columns 2L, 2R, 3 and the upper surface of the base portion 32, and the lower ends of the support columns 2L, 2R, 3 Can be rotated without interfering with the base portion 32, and the columns 2L, 2R, 3 are configured to be able to rotate approximately 90 degrees forward and backward from a position perpendicular to the base portion 32, respectively. In other words, the columns 2L, 2R, 3 are connected so that they can fall down until their upper side hits the inclined surface 101.

  Horizontal rope members 51, 51 are stretched between the upper and lower stages between adjacent struts 2L, 3, 3, 2R, and a net 11 is attached to these horizontal rope members 51, 51 by a binding tool (not shown). The horizontal rope member 51 is composed of one and the other rope members 51A and 51B, and the one rope member 51A is connected to the connecting portion 24 of one of the struts 2L, 3 and 3 by a turnbuckle 52 as an adjustment tensioner. The rope member 51B is connected to the connecting portion 24 of the other struts 3, 3, 2R adjacent to each other, and the end portions of the rope members 51A, 51B are overlapped between the struts 2L, 3, 3, 2R. An overlapping portion 53 is formed, and in this overlapping portion 53, both rope members 51A and 51B are fastened with a predetermined frictional force by wire clips 54 as fasteners. The wire clip 54 constitutes a shock absorber. In the lower horizontal rope member 51, a turnbuckle 52 is used for the rope member 51B. Moreover, the edge part by the side of the duplication part 53 of both rope material 51A, 51B is a cut end with equal thickness.

  Therefore, when a tensile force exceeding a predetermined value is applied to the horizontal rope member 51, the rope members 51A and 51B slide frictionally against the clamping force of the wire clip 54. In addition, since the end portion on the overlapping portion 53 side of both rope members 51A and 51B is a cut end having the same thickness, the end portion is pulled out without being locked to the wire clip 54, and the subsequent horizontal rope member The net 11 can be deformed without being constrained by 51, and the characteristics of the net 11 made of synthetic resin can be utilized.

  Also, the upper and lower sides of the adjacent struts 2L, 3, 3, 2R are connected by diagonal rope members 56, 56, and the upper and lower sides of the side surface of the main body 21 of the struts 2L, 3, 3, 2R. Are provided with horizontal rope connecting portions 57U and 57S in which round steel is formed in a substantially annular shape, and the oblique rope members 56 and 56 are stretched with a predetermined tension. Note that one end of the diagonal rope member 56 is connected to the lateral rope connecting portions 57U and 57S by a turnbuckle 56A which is tension adjusting means.

  The diagonal rope member 56 is made of a synthetic resin made of the same material as the net 11. Therefore, compared to the case where a metal rope is used, even if the diagonal rope member 56 and the net 11 are rubbed, damage to the net 11 can be prevented.

  A stay rope device 61 is provided between the one side connecting portion 25 at the front upper part of the support pillars 2L, 3, 3, and 2R and the front ground which is one side of the protective fence. The reserve rope device 61 includes a rope member 62 and a shock absorber 63 that slidably holds an extra length portion 62A of the rope member 62.

  As shown in FIGS. 14 to 18, the shock absorber 63 includes a pair of grip bodies 64, 64 that grip the rope material 62 with a predetermined frictional force, and a rope on the mating surface of the grip bodies 64, 64. A fitting groove 65 to be fitted to the material 62 is formed, and both gripping bodies 64, 64 are fastened and fixed by fastening means 66 such as bolts and nuts. Engaging grooves 68 and 68 for engaging the U bolt 67 are formed on the side surfaces of the gripping bodies 64 and 64 fixed to each other, and both end portions 67T and 67T of the U bolt 67 are formed in the engaging grooves 68 and 68, respectively. Engage. Further, a plate 69 for inserting both end portions 67T and 67T of the U bolt 67 is provided, and a groove portion 70 for loosely inserting the extra length portion 62A side of the rope member 62 is formed in the plate 69. Then, the middle of the U-bolt 67 is inserted and connected to the one-side connecting portion 25, and gripping bodies 64 and 64 with a rope material 62 fastened are inserted between the both end portions 67T and 67T, and the end portions 67T and 67T are further inserted. Is inserted into the holding plate 69, and the nut 71 is screwed into the end portions 67T and 67T. The pair of gripping bodies 64, 64 constitute a gripping tool 72 for gripping the rope member 62 with a predetermined frictional force. Further, as shown in FIGS. The two grippers 72 are provided side by side. In this way, a plurality of gripping tools 72 can be provided side by side on the U bolt 67. Further, if the U bolt 67 is lengthened, three or more gripping tools 72 can be provided side by side.

  Further, the side of the rope member 62 opposite to the extra length is fixed to a natural ground by a lock bolt 73 as an anchor.

  The outer connecting portions 26 of the end struts 2L and 2R are provided with retaining rope devices 61A and 61B, and these retaining rope devices 61A and 61B are different in that the holding tool 72 is used and the tensioning direction is different. The stay rope device 61A has the same configuration as that of the stay rope device 61A. The stay rope device 61A has an angle of about 45 degrees with respect to the horizontal direction of the guard fence, that is, its extra length is located on one side, The rope device 61B is provided along the left-right direction of the protective fence.

  In the construction of the protective fence 1, the mounting member 31 is fixed to the inclined surface 101 by the lock bolt 38, and the columns 2L, 3 and 2R are tiltably connected to the mounting member 31 by the bolt 36. A stay rope device 61 is provided between the front and the ground, and the columns 2L, 3 and 2R are provided with the main body 21 inclined by 5 degrees from the vertical position to the front side. The diagonal rope members 56, 56 are stretched in the crossing direction between the struts 2L, 3 and 2R to maintain the spacing between the struts 2L, 3 and 2R, and then the upper portion between the struts 2L, 3 and 2R according to appropriate procedures. The horizontal rope members 51, 51 are stretched on the lower stage, and the rope devices 61A, 61B are connected and attached to the outer connecting portions 26 of the end struts 2L, 2R. When these holding rope devices 61A and 61B are stretched, a force is applied to tilt the terminal columns 2L and 2R outward, but the distance between the columns 2L, 3 and 2R is maintained by the diagonal rope members 56 and 56. Therefore, the horizontal rope members 51 and 51 and the holding rope devices 61A and 61B can be attached relatively easily. The horizontal rope members 51 and 51 may be attached after the stay rope devices 61A and 61B are attached, or after the oblique rope members 56 and 56 and the stay rope devices 61A and 61B are attached, The tension of the rope material 51 can be adjusted.

  In this way, after the adjustment of the struts 2L, 3, 2R, the diagonal rope members 56, 56, the stay rope devices 61, 61A, 61B and the horizontal rope members 51, 51 and the adjustment of the tension, the horizontal rope member 51 is finished. , 51 and the like are used to stretch the net 11 between the columns 2L, 3 and 2R. The lower part of the net 11 is arranged along the slope 101 on the front side of the protective fence, and the end thereof is fixed to the slope 101 by the auxiliary anchor 81 which is a fixing means.

  Thus, in this embodiment, corresponding to claim 1, a plurality of support columns 2L, 3 and 2R standing upright so as to be tiltable, and a net 11 made of a synthetic resin stretched between the support columns 2L, 3 and 2R. Is provided with diagonal rope members 56, 56 that connect the upper and lower sides of the adjacent struts 2L, 3, 2R, so that the distance between the struts 2L, 3, 2R by the diagonal rope members 56, 56 is provided. Is held, it is possible to stably stretch the net 11 between the support columns 2L, 3 and 2R.

  In this way, in this embodiment, in accordance with claim 2, the rope device between the upper portions of the columns 2L, 3 and 2R and the slope 101 which is a natural ground on one side of the columns 2L, 3 and 2R. 61 is provided, and an extra length portion 62A is provided on the rope member 62 of the holding rope device 61, and a shock absorber 63 for slidably holding the extra length portion 62A is provided. Is maintained, the stay rope device 61 can be stably installed.

  In this way, in this embodiment, corresponding to claim 3, the horizontal rope material 51 is provided between the support columns 2L, 3 and 2R, and the horizontal rope material 51 is provided with the overlapping portion 53 which is an extra length portion. Since the wire clip 54 is provided as a shock absorber for slidably gripping the overlapping portion 53, the distance between the supports is held by the slanted rope members 56, 56, thereby stabilizing the horizontal rope member 51 provided with the shock absorber. Can be installed.

  In this way, in this embodiment, in correspondence with claim 4, the nets 11 and 11 having different mesh sizes are overlapped and stretched between the columns 2L, 3 and 2R. Even if the cable 11 is stretched, the distance between the support columns 2L, 3 and 2R can be maintained, and even a small rock fall can be captured by the small mesh net 11, and the rock fall caught by the small mesh mesh 11 can be captured. The impact force is absorbed by the mesh 11 having a large mesh, and the impact force of falling rocks can be efficiently absorbed.

  Further, in this embodiment, in accordance with the fifth aspect of the present invention, after the columns are erected, the upper and lower sides of the adjacent columns 2L, 3 and 2R are connected by the diagonal rope members 56 and 56. Since the net 11 is stretched between the struts 2L, 3 and 2R, it is not necessary to maintain the distance between the struts 2L, 3 and 2R by the net 11, and the net 11 can be easily stretched.

  Further, as an effect of the embodiment, a protective fence 1 in which a net 11 made of a synthetic resin is stretched between support columns 2L, 3, 3, 2R, and the support columns 2L, 3, 3, 2R are erected so as to be tiltable. In addition, a rope device 61 is provided between the upper part of the pillars 2L, 3, 3, 2R and the slope 101, which is a natural mountain on one side of the pillars 2L, 3, 3, 2R. Since the extra length portion 62A is provided in the 62 and the shock absorber 63 for slidably holding the extra length portion 62A is provided, the net 11 made of synthetic resin has a higher elongation rate than the net made of steel or the like. Because of its large size, when it receives a rock fall, the net 11 extends to the other side to absorb the impact, and when a force exceeding a predetermined level is applied to the pillars 2L, 3, 3 and 2R from the net 11 receiving the rock fall, As a result, the extra length portion 62A slides and the columns 2L, 3, 3, 2R tilt to the other side. When receiving a rock fall in this way, the net 11 is deformed and extended to the other side, and further, the struts 2L, 3, 3 and 2R are tilted to the other side, whereby the net 11 is deformed and moved after receiving the rock fall. In addition, the time is increased, and the shock absorbing ability is effectively improved.

  Further, when the support pillars 2L, 3, 3, 2R are tilted to the other side, the extra length 62A of the holding rope member 62 slides with respect to the shock absorber 63, so that a part of rock fall energy can be absorbed.

  By using the mesh 11 as the synthetic resin, the weight is reduced, and a large heavy machine such as a crane is not required for construction transportation, and the protective fence 1 can be installed in a place where construction is restricted topographically. Further, since the synthetic resin net 11 is flexible, it can be made compact by winding it at the time of carrying in, and at the same time, the workability on the site is also improved.

  Further, since the tilting position on the other side of the support pillars 2L, 3, 3, 2R is determined, when a rock fall is received, the net 11 extends to the other side to absorb the impact, and the struts 2L, 3 from the net 11 that has received the rock fall. , 3 and 2R, when a force exceeding a predetermined value is applied, the extra length portion 62A slides with respect to the shock absorber 63, and the columns 2L, 3, 3, and 2R tilt to the other side, and the columns 2L, 3, 3, and 2R tilt. Since 2R falls and receives the energy of falling rocks, a high impact absorbing effect is obtained.

  Further, since the shock absorber 63 is provided with a plurality of grippers 72 for gripping the rope material 62 with a predetermined frictional force, it is possible to enhance the impact absorbing effect due to the frictional sliding of the rope material 62. In particular, by preparing a common gripper 72 and adjusting the number thereof, a desired impact absorbing effect can be obtained, so that the gripper 72 and the buffer 63 can be used as general-purpose products.

  Further, since the net 11 is a knotless net, the wire rods 13 and 13A constituting the net 11 are formed straight without being connected at the intersection 14, so that when a force such as falling rocks is applied to the net 11, Since the force is dispersed throughout the net 11, a high shock absorbing function can be obtained. Also, since there are no nodules, it is lighter and thinner, making it more compact when stacked, folded or rolled.

  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, in the embodiment, an example is shown in which a support is built on a natural ground such as a slope, but a support may be built on an installation surface provided with a foundation such as concrete.

It is a side view of the protector which shows Example 1 of this invention. FIG. It is a partial top view same as the above. It is a partial top view 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 side view of the main part of the net with a part in cross section. FIG. 8A shows a net with a large mesh, and FIG. 8B shows a net with a small mesh. FIG. 9A is a front view, and FIG. 9B is a side view. FIG. 10A is a front view, and FIG. 10B is a side view. It is a front view of a support | pillar lower part same as the above. It is a top view of a support | pillar lower part same as the above. It is a top view of a support | pillar same as the above. It is a front view of a shock absorber same as the above. It is a top view of the holding tool of a buffer tool same as the above. It is a side view of the holding | gripping tool of a buffer tool same as the above. It is a side view of a shock absorber same as the above. It is a side view of the shock absorbing tool which has two holding tools same as the above.

Explanation of symbols

1 Guard fence 2L, 2R Post 3 Intermediate post
11 Net
51 Horizontal rope material
52 Turnbuckle
53 Overlap (extra length)
54 Wire clip (buffer)
56 Oblique rope material
61 Retaining rope device
62 Rope material
62A extra length
63 Shock absorber
101 slope (natural ground)

Claims (5)

A protective fence comprising a plurality of support columns standing upright so as to be tiltable and a net made of a synthetic resin stretched between the support columns, comprising an oblique rope member that connects the upper side and the lower side of adjacent columns. A protective fence. A shock absorber that provides a holding rope device between the upper portion of the support column and the ground on one side of the support column, and provides a surplus length portion on the rope material of the support rope device and slidably holds the surplus length portion. The protective fence according to claim 1, further comprising: The protective fence according to claim 1, wherein a horizontal rope member is provided between the columns, a surplus portion is provided on the horizontal rope member, and a shock absorber is provided for slidably gripping the surplus portion. . The protective fence according to any one of claims 1 to 3, wherein the nets having different mesh sizes are overlapped and stretched between the columns. The construction method of the protective fence according to claim 1, wherein the struts are erected and the upper and lower sides of adjacent struts are connected by the diagonal rope member, and then the net is stretched between the struts. Construction method of the protective fence characterized by

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