JP2010229629A - Guardrail - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently support horizontal rope members receiving impact force of a falling stone, by a plurality of posts. <P>SOLUTION: The plurality of posts 2 are provided at predetermined spaces, and the horizontal rope members 3, 3A are provided in multiple stages between the posts 2. The horizontal rope members 3, 3A are provided with oblique arranged parts 103, 103A passing along the front part of the post 2 and along the rear part of the post 2 adjoining the post 2. Between the adjoining posts 2, at least a pair of oblique arranged parts 103, 103A of the horizontal rope members 3, 3A provided in multiple stages are arranged in an intersecting state in a longitudinal direction. When the falling stone R hits the pair of oblique arranged parts 103, 103A between the adjoining posts 2 to bend the horizontal rope members 3, 3A backward, the two horizontal rope members 3, 3A are supported by four posts 2. The horizontal rope members 3, 3A can thus be efficiently supported by the plurality of posts. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a protective fence that disperses and absorbs impact force caused by avalanches and falling rocks with a horizontal rope material.

  Conventionally, in this type of avalanche / falling rock protection fence, pillars are provided at predetermined intervals, and horizontal horizontal rope members are moored between each pillar in a state that allows horizontal sliding, and both ends of the horizontal horizontal rope member are fixed. Then, between each strut is shielded by a wire net hooked on a horizontal horizontal rope material, and the extra length part formed by polymerizing the horizontal rope material in the middle of the horizontal horizontal rope material and the extra length part are constant When the tension exceeding the set tension is applied to the horizontal horizontal rope material by the clamping tool that is clamped by the force of the horizontal buffer, the horizontal length of the horizontal rope material retains a certain frictional force, and the extra length extends to absorb the tension. What formed the part is disclosed (for example, patent document 1). As a result, the shock can be absorbed by the sliding of the buffer part formed in a part of the horizontal horizontal rope material before the impact is transmitted to the support column. By cooperating with the wire net, it is possible to absorb the impact more effectively than in the past.

  FIG. 26 shows an example of the above-mentioned protective fence. When the support columns 2 are provided at predetermined intervals, the horizontal horizontal rope material 3 is provided in multiple stages between the support columns 2, 2, and falling rocks collide with the horizontal horizontal rope material 3, The horizontal horizontal rope member 3 is bent between the supports 2 and 2 and receives the load of the falling rock R.

  In the guard fence shown in FIG. 26, when the horizontal horizontal rope member 3 between the support columns 2 and 2 receives a falling rock, the support columns 2 and 2 on both sides mainly support the load, so that the support columns 2 and 2 on both sides are large. There is a problem of concentrated loads.

  Further, in order to increase the impact absorption effect, straddle a plurality of ropes arranged in multiple stages, arrange a wavy connecting material toward the crossing direction of the ropes, and the ropes arranged in multiple stages and the connecting material An impact-absorbing fence in which an intersection is fastened with a fastener has been proposed. In this shock-absorbing fence, it is described that a rope is wound between pillars in a plane eight shape (for example, Patent Document 2).

  In the above shock absorbing fence, the ropes of each step can be looped and wound between the pillars, so that the rope can slide on the pillars and absorb the impact force when falling rocks. Since the falling rock load is supported by struts on both sides, it is necessary to use struts with high strength.

Japanese Patent Publication No. 7-018134 Japanese Patent Laid-Open No. 2003-184035

  Therefore, the present invention has been made paying attention to each of the above-mentioned problems, and an object thereof is to provide a protective fence that can efficiently support a horizontal rope member subjected to the impact force of falling rocks by a plurality of columns. To do.

  In order to achieve the above object, the protective fence of the present invention is a protective fence in which a plurality of support columns are provided at predetermined intervals, and horizontal rope members are provided in multiple stages between the support columns. The diagonal arrangement part which passes through the front part of this and the rear part of the post adjacent to this post is provided, and between the adjacent post, at least one set of the diagonal arrangement part of the horizontal rope material provided in multiple stages intersects in the front-rear direction. It is characterized by being arranged in.

  In this way, between adjacent struts, by arranging at least one set of inclined arrangement portions in a crossing manner, falling rocks hit a set of inclined arrangement portions between adjacent struts, and the horizontal rope material bends backward, One inclined arrangement portion is supported by one of the adjacent struts and the other adjacent strut of the adjacent strut, and the other oblique disposition portion is the other of the adjacent struts and one of the adjacent struts. The two horizontal rope members are supported by the four support columns, and the horizontal rope material can be efficiently supported by the plurality of support columns.

  Further, in the above-described protective fence, at least one set of the diagonally arranged portions of the horizontal rope members adjacent in the vertical direction is arranged in an intersecting manner in the front-rear direction between adjacent struts.

  Since the diagonally arranged portions arranged in a crossing manner are positioned above and below in this manner, falling rocks can be captured by the diagonally arranged portions of the upper and lower horizontal rope members.

  Further, in the above-described protective fence, a pair of the diagonally arranged portions located in substantially the same plane are arranged in an intersecting manner in the front-rear direction between adjacent support columns.

  Thus, since the diagonal arrangement | positioning part arrange | positioned to cross | intersect is located in a substantially identical plane, falling rocks can be capture | acquired with several horizontal rope materials.

  In the above-described protective fence, the horizontal rope member may be provided with a linear arrangement portion that passes between the rear portions of adjacent struts.

  Thus, by passing the horizontal rope member between the rear portions of the adjacent struts and passing the front portions of the struts adjacent to the struts, the load of the falling rock can be supported by the struts away from the falling rock position.

  Further, in the above-described protective fence, the horizontal rope member slides on a front portion of the support column.

  As the horizontal rope member slides on the front part of the column in this way, the horizontal rope member is bent backward, and a falling rock load is applied to the front part of the column.

  Furthermore, in the above-described protective fence, the front portion of the support column is formed in a curved shape.

  Thereby, a horizontal rope material can slide smoothly.

  Furthermore, in the above-described protective fence, the curvature radius of the front portion of the support column is 10 times or more the diameter of the horizontal rope member.

  Thereby, even if a horizontal rope material bends, the performance fall of a horizontal rope material can be prevented, without generating an excessive bending in a horizontal rope material.

  Furthermore, in the above-described embodiment, a loading member having a loading surface is provided on an end portion of the horizontal rope member or a member connected to the end portion, a loading surface is provided on the support column, and a ring material is provided between the both loading surfaces. It is characterized by being arranged with a pinch in between.

  As a result, when an impact force such as avalanche or falling rock is received and a tensile force is applied to the horizontal rope member, the space between the two loading surfaces is narrowed, the ring is crushed, and the impact energy can be absorbed by the deformation of the ring member.

  Furthermore, in the above embodiment, a shock absorber that grips the end of the horizontal rope member is provided, and when the horizontal rope member receives a predetermined tension or more, the horizontal rope member is rubbed against the shock absorber. It is configured to slide.

  As a result, when an impact force such as avalanche and falling rock is received and a tensile force of a predetermined level or more is applied to the lateral rope member, the impact energy can be absorbed by the lateral rope member frictionally sliding against the shock absorber.

  According to the protective fence of the present invention, by supporting the horizontal rope material that has received the falling rock with the plurality of support columns, the horizontal rope material that has received the impact force of the falling rock can be efficiently supported by the plurality of support columns.

It is a schematic plan view of the protection fence which shows Example 1 of this invention, FIG. 1 (A) shows the state which received the rock fall before FIG. 1 (A) received the rock fall. It is a front view of a protection fence same as the above. The same as the above, it shows in the side view of the principal part of the support. It is a schematic plan view of the guard fence which shows Example 2 of this invention. It is a front view of a protection fence same as the above. It is a top view explaining the state which received the falling rock same as the above. It is a side view of the support | pillar principal part which shows Example 3 of this invention. It is a side view of the support | pillar principal part which shows Example 4 of this invention. It is a front view of the periphery of an impact absorbing device having a part in cross section showing Example 5 of the present invention. It is a front view of a loading apparatus same as the above. It is a perspective view of a steel pipe ring same as the above. It is a graph showing the relationship between the load and the deformation when there is no hole and the width of the loading surface is 200 mm. FIG. 5 is a graph showing the relationship between the load and the deformation amount when there is a hole and the width of the loading surface is 200 mm. It is a graph showing the relationship between the load and deformation when there is no hole and the width of the loading surface is 100 mm. FIG. 6 is a graph showing the relationship between the load and the deformation when there is a hole and the width of the loading surface is 100 mm. It is a graph showing the relationship between the load and deformation when there is no hole and the width of the loading surface is 75 mm. FIG. 6 is a graph showing the relationship between the load and the amount of deformation when there is a hole and the width of the loading surface is 75 mm. FIG. 6 is a graph showing the relationship between the load and the deformation amount when there is a hole and the width of the loading surface is 200 mm, and the amount of absorbed energy E is indicated by hatching. FIG. 5 is a graph showing the relationship between the load and the deformation amount when there is a hole and the width of the loading surface is 75 mm, and the amount of absorbed energy E is indicated by hatching. It is explanatory drawing which shows a deformation | transformation of the steel pipe ring in case the width of a loading surface is 200 mm same as the above. It is explanatory drawing which shows a deformation | transformation of the steel pipe ring in case the width of a loading surface is 75 mm same as the above. It is explanatory drawing which shows a deformation | transformation of the steel pipe ring in case the width of a loading surface is 100 mm same as the above. It is a side view which shows Example 6 of this invention. It is a top view around an impact-absorbing device showing Example 7 of the present invention. It is a top view around an impact-absorbing device showing Example 8 of the present invention. It is a top view of the protection fence which shows a prior art example.

  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, an unprecedented protective fence is obtained by adopting a new protective fence different from the conventional one, and the protective fence will be described.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show Embodiment 1 of the present invention. As shown in FIG. 1, a falling rock protection fence as a protection fence is provided with a concrete foundation 1 as a foundation alongside a slope or a slope. A plurality of columns 2 are erected. The column 2 is made of H-shaped steel, concrete column, steel pipe, concrete-filled steel pipe or the like. In this example, a steel pipe having a circular cross section is used, and its lower end is fixed to the concrete foundation 1. Horizontal rope members 3, 3 A are provided on the upper and lower stages between the columns 2, end portions of these horizontal rope members 3, 3 A are fixed, and the space between the columns 2, 2 is shielded by a wire mesh 4. In FIG. 1, for easy understanding, the horizontal rope material 3 is represented by a thick line and the horizontal rope material 3 </ b> A is represented by a thin line.

  The strut 2 may be fixed to the foundation as described above, or the lower part may be fixed in the ground, or the lower part may be fixed to a slope, etc. It may be fixed by.

  As shown in FIG. 2, the horizontal rope members 3, 3 </ b> A are alternately arranged with an interval in the vertical direction, and the first horizontal rope members 3 alternate between the front part and the rear part of adjacent struts 2. Contrary to the first horizontal rope member 3, the second horizontal rope member 3 </ b> A is arranged so as to alternately pass through the rear part and the front part of the adjacent struts 2. That is, the horizontal rope member 3 and the horizontal rope member 3A are disposed so as to pass through the front portion and the rear portion of the support column 2 in reverse. Thereby, the horizontal rope members 3 and 3A are provided with diagonally arranged portions 103 and 103A passing through the front portion of the support column 2 and the rear portion of the support column 2 adjacent to the support column 2, and these obliquely arranged portions 103 and 103A are They are arranged in a crossing manner in the front-rear direction. In the figure, M is the front side of the protective fence and U in the figure is the rear side.

  In addition, as shown in FIG. 3, the ring-shaped latching | locking part 11 is provided in the front part of the support | pillar 2, and the horizontal rope members 3 and 3A are latched in this latching part 11, and the horizontal rope members 3 and 3A The height position may be determined. On the other hand, the rear portion of the support column 2 is provided with a mounting portion 12 for mounting the horizontal rope members 3 and 3A without providing a locking portion, and the horizontal rope members 3 and 3A mounted on the mounting portion 12 are connected to the support column. It is comprised so that it can leave | separate from 2. The placement unit 12 is not necessarily provided. Moreover, the latching | locking part 11 may be a hook-shaped thing which the upper part opened.

  Moreover, the external shape of the said support | pillar 2 has comprised cylindrical shape, and the front part and the rear part of the support | pillar 2 are formed in the curved surface shape. Moreover, the diameter of the support | pillar 2 is 20 times or more of the diameter of the horizontal rope materials 3 and 3A. Moreover, although it is preferable to use a wire rope for the horizontal rope materials 3 and 3A, the thing of various materials can be used. By doing in this way, as shown in FIG.1 (B), even if the horizontal rope materials 3 and 3A bend along the support | pillar 2 by falling rock, the fall of the tensile strength of the horizontal rope materials 3 and 3A can be suppressed.

  And when tension | tensile_strength generate | occur | produces in the horizontal rope materials 3 and 3A of an upper-lower stage by the falling rock R and it bends back, as shown in FIG.1 (B), the horizontal rope material 3 will be the support | pillars 2 and 2 which pinch the falling rock R between them. The horizontal rope member 3A is supported by the other one of the columns 2 and 2 sandwiching the falling rock R and the column 2 adjacent to the one column 2 in this case. The impact of the falling rock R can be dispersed mainly on the four columns 2, 2, 2, 2.

  As described above, in this embodiment, in the protective fence in which a plurality of support columns 2, 2... Are provided at predetermined intervals and the horizontal rope members 3, 3A are provided in multiple stages between the support columns 2, 2,. 3A is provided with diagonally arranged portions 103, 103A passing through the front part of the support column 2 and the rear part of the support column 2 adjacent to the support column 2, and the horizontal rope member 3 provided in multiple stages between the adjacent support columns 2, 2,. , 3A of at least one set of diagonally arranged portions 103, 103A are arranged in a crossing manner in the front-rear direction, so falling rock R hits the set of diagonally arranged portions 103, 103A between adjacent struts 2, 2,. When the horizontal rope members 3 and 3A are bent backward, one diagonally arranged portion 103 is supported by one of the adjacent columns 2 and the column 2 adjacent to the other of the adjacent columns 2 and the other diagonally arranged portion 103A. Is the other of the adjacent struts 2 and the adjacent strut 2 The two horizontal rope members 3 and 3A are supported by the four columns 2, 2, 2 and 2, and the horizontal rope members 3 and 3A are supported by a plurality of columns. It can be supported more efficiently.

  As described above, in this embodiment, at least one pair of diagonally arranged portions 103 and 103A of the horizontal rope members 3 and 3A adjacent to each other between the adjacent support columns 2, 2. Therefore, the falling rock R can be captured by the diagonally arranged portions 103, 103A of the upper and lower horizontal rope members 3, 3A.

  Further, in this embodiment, since the horizontal rope members 3 and 3A slide on the front part of the support column 2, the horizontal rope members 3 and 3A are bent rearward, and the load of the falling rock R is applied to the front part of the support column 2. Join.

  Further, in this embodiment, since the front portion of the support column 2 is formed in a curved shape, the horizontal rope members 3 and 3A can slide smoothly.

  Further, in this embodiment, since the radius of curvature of the front portion of the support column 2 is 10 times or more the diameter of the horizontal rope members 3 and 3A, the horizontal rope members 3 and 3A are not bent excessively. It is possible to prevent deterioration of the performance of the horizontal rope material.

  4 to 6 show a second embodiment of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this example, horizontal rope members 3B, 3C, 3D are provided in the upper and lower stages between the struts 2, and a linear arrangement portion passing between the rear portions of the adjacent struts 2, 2 is provided in the horizontal rope members 3B, 3C, 3D. ing. In FIG. 3, for easy understanding, the horizontal rope material 3B is represented by a thick line, the horizontal rope material 3C is represented by a middle line, and the horizontal rope material 3D is represented by a thin line.

  The horizontal rope members 3B, 3C, 3D are arranged so as to pass through the front part of the support pillar 2, the rear part of the two support pillars 2, and the front part of the support pillar 2 from one side of the protective fence to the other side. Arrangement parts 103B, 103C, 103D, linear arrangement parts 104B, 104C, 104D, oblique arrangement parts 103B, 103C, 103D are arranged in this order, and after passing through the rear part of the two support columns 2, 2, respectively, It is arranged to pass through the front.

  From one side of the protective fence to the other side, the second horizontal rope member 3C passes through the front part of the column 2 adjacent to the one side of the column 2 through which the first horizontal rope member 3B passes through the front part. 3C of 2nd horizontal rope materials are arrange | positioned so that 2D of 2nd horizontal rope materials may pass in the front part of the support | pillar 2 adjacent to the one side of the support | pillar 2 which passes a front part.

And when tension | tensile_strength generate | occur | produces in the horizontal rope material 3B, 3C, 3D of the upper-lower stage by the falling rock R, and it bends backward, as shown in FIG. (The left side in FIG. 6) and the other (right side in FIG. 6) two supporting columns 2 adjacent to each other. 2 is supported by the other struts 2 and 2 sandwiching the falling rock R, and two struts 2 adjacent to one strut 2,
In this case, the impact of the falling rock R can be dispersed mainly on the six columns 2, 2, 2, 2, 2, 2.

  As described above, in this embodiment, the same operations and effects as those in the above-described embodiment are obtained.

  In this way, in this embodiment, since the horizontal rope members 3B, 3C, 3D are provided with the linear arrangement portions 104B, 104C, 104D passing between the rear portions of the adjacent struts 2, 2, the horizontal rope members 3B, 3C are provided. , 3D is passed between the rear portions of the adjacent struts 2 and 2 and the front portion of the strut 2 adjacent to the struts 2 and 2 is passed to support the load of the rock fall R by the strut 2 away from the rock fall position. .

  FIG. 7 shows a third embodiment of the present invention. The same reference numerals are given to the same portions as those of the above-described embodiments, and detailed description thereof will be omitted.

  This example is an example in which the horizontal rope members 3 and 3A are arranged in substantially the same plane in the first embodiment, and as shown in FIG. 7, two horizontal rope members 3 and 3A are adjacent to each step. Arranged. In addition, the latching | locking part 11 is abbreviate | omitting illustration.

  As described above, this embodiment also has the same operations and effects as the above embodiments.

  As described above, in this embodiment, the pair of obliquely arranged portions 103 and 103A located in substantially the same plane between the adjacent struts 2 and 2 are arranged in an intersecting manner in the front-rear direction. The falling rock R can be captured by the plurality of horizontal rope members 3 and 3A.

  FIG. 8 shows a fourth embodiment of the present invention. The same reference numerals are given to the same portions as those of the above-described embodiments, and detailed description thereof will be omitted.

  This example is an example in which the horizontal rope members 3B, 3C, 3D are arranged in substantially the same plane in the second embodiment, and the locking portion 11 is not shown in the figure, as shown in FIG. In each stage, three horizontal rope members 3B, 3C, 3D are arranged close to each other.

  As described above, this embodiment also has the same operations and effects as the above embodiments.

  As described above, in this embodiment, a pair of obliquely arranged portions 103B, 103C, and 103D that are positioned in substantially the same plane are arranged in an intersecting manner in the front-rear direction between the adjacent struts 2 and 2, so The rock fall R can be captured by the plurality of horizontal rope members 3B, 3C, 3D located at the position.

  FIGS. 9-19 shows Example 5 of this invention, attaches | subjects the same code | symbol to the same part as said each Example, the detailed description is abbreviate | omitted and explained in full detail.

  In this example, the end portion 3T of the horizontal horizontal rope member 3 is connected to the support column 2T of the terminal by the shock absorbing device 111, and the support column 2T of the terminal has a web portion 105 and both flange portions 106 and 106. It is made of steel. The shock absorbing device 111 includes a ring material 112 made of a steel pipe and the like, loading plates 113 and 113 as loading members arranged so as to sandwich the ring material 112 from both sides of the outer periphery, the loading plate 113, the ring material 112, and the loading The said edge part 3T inserted in the board 113 and the terminal fixing tool 114 provided in this edge part 3T are provided.

  In this example, the portion to which the impact absorbing device 111 is attached is the web portion 105. A through hole 105K is formed in the web portion 105, and the through holes 113K and 113K are formed at substantially the center positions of the load plates 113 and 113 described above. In addition, through-holes 112K and 112K are formed in the ring material 112 at positions facing each other in the circumferential direction. In this example, the web portion 105 of the column 2T is the mounting position, and the end portion 3T is inserted through the through holes 105K, 113K, 112K, 112K, 113K in this order, and the inserted end portion 3T is inserted into the end portion 3T. Fixing is performed by the terminal fixing device 114. The terminal fixing tool 114 is a known one that is fixed to the terminal 3T by a wedge action or the like. The surfaces of the load plates 113 and 113 that are in contact with the outer periphery of the ring material 112 are the load surfaces 113M and 113M. Although not shown, the horizontal horizontal rope member 3 may be similarly provided with an impact absorbing device 111 at the other end of the end 3T, and the other end may be connected to another strut. You may make it fix to 2,2T.

  The load surface 113M described above has a width substantially the same as or larger than the width in the length direction of the ring material 112, while the width W in the diameter direction of the ring material 112 is equal to the width of the ring material 112. It is smaller than the diameter D dimension, and preferably set smaller than the distance K dimension between the curved protrusions 112D and 112D of the ring material 112 which is crushed until the opposing inner surfaces come into contact with each other, as will be described later.

  An experiment relating to the configuration of the loading surface M will be described below.

  As shown in FIG. 10, a loading device 201 is used as an experimental device. The loading device 201 includes a measuring device 203 that measures a load on the fixed plate 202 side, a lifting unit 205 that moves the movable plate 204 up and down, and a fixed device. A laser displacement meter 206 for measuring a displacement amount between the plate 202 and the movable plate 204, and a steel pipe ring 211 corresponding to a ring material standing in a diametrical direction between the fixed plate 202 and the movable plate 204. The movable plate 204 was lowered and the load applied to the steel pipe ring 211 and the deformation amount of the steel pipe ring 211 were measured.

  As shown in FIG. 11, the steel pipe ring 211 is a carbon steel pipe for machine structure (STKM13A), has a nominal diameter of 175, an outer diameter φ of 190.7 mm, a thickness t of 12 mm, and a length L of 150 mm. In addition, when the width PL in the diameter direction of the steel pipe ring 211 of both plates 202 and 204 is 200 mm, 100 mm, and 75 mm, the applied load P (kN) and the displacement amount δ (mm) of the steel pipe ring 211 at that time These relationships were measured and shown in the graphs of FIGS. The widths of the plates 202 and 204 correspond to the width of the loading surface.

  In order to match the actual use conditions, the steel pipe ring 211 was subjected to an experiment using the one having no through holes 211K and 211K corresponding to the through hole 112K and the one having the through holes 211K and 211K. The presence / absence of the through hole 211K is shown in the graph as graph lines of “with hole” and “without hole”. Further, in the graph, as an example of the breaking strength of the wire, a mark is given at a position where the load P = 157.0 kN.

  FIG. 18 shows the amount of absorbed energy E absorbed by deformation of the steel pipe ring 211 up to the strength at which the wire breaks in FIG. 13, because the wire breaks at a tensile load of 157.0 kN. The deformation amount δ of the steel pipe ring 211 at this time is 87.54 mm, and the absorbed energy E is 10.0 kJ. However, since the steel pipe ring 211 is deformed from the deformation amount δ of 87.54 mm, a loss occurs in shock absorption due to the deformation of the steel pipe ring 211. Therefore, as shown in the “thin wall” in the figure, if the thickness t of the steel pipe ring 211 is made thinner than 12 mm, the deformation amount δ until the wire breaks is approximately 140 mm, but the “thin wall” graph Since the line has a gradient, the area between the graph line and the horizontal line with the load P = 157.0 kN at which the wire breaks is lost. Further, if the load P at which the wire breaks is increased to 300.0 kN, the absorbed energy E becomes larger than 10.0 kJ, but the area between the solid graph line and the horizontal line with the load P = 300.0 kN is energy absorption. It turns out that it is a loss from the top, the tensile strength of the wire is greatly increased, and the cost is increased, but the effect is small.

  On the other hand, FIG. 19 shows the amount of absorbed energy E absorbed by deformation of the steel pipe ring 211 up to the strength at which the wire breaks in FIG. 17, and the tensile load is the same as in FIG. Since the wire breaks at 157.0 kN, the deformation δ of the steel pipe ring 111 at this time is 143.89 mm, the absorbed energy E is 18.3 kJ, and the load P increases as the deformation δ increases compared to the case of FIG. It can be seen that the increase in the ratio is moderate or substantially constant, and the shock absorption due to deformation of the steel pipe ring 211 is excellent.

  Next, the deformation | transformation of the steel pipe ring 211 by the difference in the width | variety PL of the plates 202 and 204 as mentioned above is demonstrated using FIGS. 20 to 22 show a state in which the steel pipe ring 211 is crushed from (A) to (C). FIG. 20 shows the deformation of the steel pipe ring 211 when the width PL is 200 mm. From the circular state, as shown in FIG. 20 (A), the steel pipe ring 211 is recessed at the center position of the plates 202 and 204, Curved protrusions 112D and 112D are generated on both sides of the recess. When the steel pipe ring 211 is further crushed as shown in FIGS. 20B and 20C from here, the load P increases with respect to the deformation amount δ, and the graph shown in FIG. 12 or FIG. 13 is obtained. On the other hand, as shown in FIG. 21, when the width PL is 75 mm, a recess is generated in the steel pipe ring 211 at the center position of the plates 202 and 204 from the circular state, as shown in FIG. Curved projections 112D and 112D are generated on both sides, but the plates 202 and 204 do not push the maximum projecting portions of the curved projections 112D and 112D, and the curved projections as shown in FIGS. Since the steel pipe ring 211 is pushed between 112D and 112D, even if the deformation amount δ increases, the load P increases slowly or at a substantially constant rate, and the force is almost uniform until the opposing inner surfaces of the steel pipe ring 211 come into contact with each other. Can be transformed. Further, as shown in FIG. 22, even when the width PL is 100 mm, the steel pipe ring 211 is deformed in substantially the same manner as in FIG.

  Thus, from the experiment, by setting the size and thickness of the ring material 112 to be used, the width W in the diameter direction of the ring material 112 of the loading surface 113M, the tensile strength of the horizontal horizontal rope material 3 which is a wire, and the like, It was found that the absorption energy due to the deformation of the ring material 112 can be set to be maximized. In addition, with supplementary explanation using FIG. 19, the absorbed energy is preferably 50% or more with respect to the energy corresponding to the product of the load P = 157.0 kN corresponding to the breaking strength of the wire and the inner diameter of the ring material 112. Is 60% or more. The inner diameter of the ring material 112 is the maximum amount of displacement of the ring material 112.

  When an impact force is applied by falling rocks or the like, a tensile force is generated in the horizontal horizontal rope member 3, the terminal fixing tool 114 moves to the support column 2T side, and the ring member 112 is crushed by the loading surfaces 113M and 113M. After the ring material 112 is crushed until the opposed inner surfaces come into contact with each other, the horizontal transverse rope material 2 is stretched and broken to absorb the impact energy.

  As described above, this embodiment also has the same operations and effects as the above embodiments.

  As described above, in this embodiment, the loading plate 113 as the loading member 113 having the loading surface 113M is provided on the end of the horizontal rope members 3, 3A, 3B, 3C, 3D or the member connected to the end, and the protective fence Since the loading surface 113M is provided on the support column 2T and the ring material 112 is sandwiched between the loading surfaces 113M and 113M, when a tensile force is applied to the horizontal horizontal rope material 3 due to an impact force such as an avalanche or falling rock, The space between both loading surfaces 113M and 113M is narrowed, the ring material 112 is crushed, and the impact energy can be absorbed by the deformation of the ring material 112.

  In addition, in a protective fence provided with a plurality of support columns 2 ... 2T at predetermined intervals and a horizontal horizontal rope material 3 as a horizontal wire between the support columns 2 ... 2T, a loading surface on the end 3T of the horizontal horizontal rope material 3 Since the loading plate 113 which is a loading member having 113M is provided, the loading surface 113M is provided on the support 2T, and the ring material 112 is disposed between the loading surfaces 113M and 113M. When a tensile force is applied to the horizontal lateral rope member 3, the space between both loading surfaces 113 </ b> M and 113 </ b> M is narrowed, the ring member 112 is crushed, and the impact energy can be absorbed by the deformation of the ring member 113.

  Further, since the ring material 112 is made of steel, the member is simple and relatively inexpensive.

  Further, the ring material 112 is crushed between both loading surfaces 113M and 113M by the tension applied to the horizontal horizontal rope material 3 as a wire, and the width W in the diameter direction of the ring material 112 of at least one loading surface 113M is equal to that of the ring material 112. Since the ring material 112 is crushed by the tensile force of the horizontal horizontal rope material 3 because it is narrower than the diameter D, the ring material 112 is deformed into a substantially infinite shape where the opposed inner surfaces abut, but the width W of the loading surfaces 113M and 113M Since it is narrower than the diameter D of the ring material 112, the loading surface 113M does not crush the substantially infinite curved protrusions 112D and 112D. And after deform | transforming into a substantially infinity shape, in order to crush the curved protrusion 112D, 112D, big force is required, Therefore, the tensile force of the horizontal horizontal rope material 3 increases, and the horizontal horizontal rope material 3 is early. However, since the width W of the loading surface 113M is narrower than the diameter D of the ring material 112, the horizontal horizontal rope material 3 can be prevented from breaking early, and the impact energy absorption effect is excellent.

  Further, the ring material 112 is crushed between the loading surfaces 113M and 113M by the tension applied to the horizontal horizontal rope material 3 as the wire material, and the width W of the loading surface 113M in the diameter direction of the ring material 112 is equal to that of the crushed ring material 112. Since the gap K between the curved protrusions 112D and 112D generated on both sides in the width direction is narrower than the distance K, the ring material 112 is deformed into a substantially infinite shape where the opposed inner surfaces come into contact with each other. While the force applied to the ring material 12 rises substantially constant or gently until it breaks, the range of deformation of the ring material 112 becomes large, whereby the product of the force applied to the ring material 112 and the deformation amount of the ring material 112 is increased. The amount of absorption of impact energy corresponding to can be greatly increased.

  Moreover, since the horizontal horizontal rope material 3 which is a wire has a tensile strength that does not break even if the ring material 112 is crushed until the opposing inner surfaces come into contact with each other, it absorbs impact energy until the ring material 112 is crushed into a substantially ∞ shape. Can do.

  Further, in the impact energy absorption amount setting method, the impact energy absorption amount due to the deformation of the ring material 112 is adjusted by adjusting the diameter D of the ring material 112 and the width W of the loading surface 113M in the diameter direction of the ring material 112. Thus, by changing the deformation condition of the ring material 112 by adjusting the width W of the loading surface 113 or the like, the amount of impact energy absorbed by the deformation of the ring material 112 can be arbitrarily set.

  In addition, the horizontal horizontal rope member 3 as the wire rod is set so as to have a tensile strength that does not break even when the ring member 112 is crushed until the opposing inner surfaces come into contact with each other, so that the impact energy is absorbed until the ring member 112 is crushed. Can do.

  FIG. 23 shows Embodiment 6 of the present invention. The same reference numerals are assigned to the same parts as those of the above-described embodiments, and detailed description thereof is omitted. In this example, a loading plate is provided on the column 2T side. Without being provided, a flat loading surface is constituted by the outer surface 105G of the web portion 105 of the support column 2T. Thus, at least one of the loading surface 113M and the width W of the outer surface 105G is narrower than the diameter D of the ring material 112. The same operations and effects as the above-described embodiments are achieved.

  FIG. 24 shows Embodiment 7 of the present invention. The same reference numerals are given to the same portions as those of the above-described embodiments, and detailed description thereof will be omitted. In this example, the end portion of the horizontal horizontal rope member 3 is shown. The cable end fitting 131 as a member is connected to 3T, and the end 132T of the steel rod 132 at the end of the cable end fitting 131 is connected to the column 2T of the terminal by the impact absorbing device 111. The end 132T is provided with a male screw portion and fixed by screwing double nuts 133 and 133 into the male screw portion.

  Thus, in the present embodiment, the ring material 112 is provided on the steel rod 132 of the cable end fitting 131 which is a member connected to the end 3T of the horizontal horizontal rope material 3 as a wire, and the loading surface is provided on both sides of the ring material 112. Since the loading plate 113, which is a loading member having 113M, is provided, the same operations and effects as those of the above-described embodiments are obtained in correspondence with the respective claims.

  FIG. 25 shows an eighth embodiment of the present invention. The same reference numerals are given to the same portions as those of the above-mentioned embodiments, and detailed description thereof will be omitted.

  In this example, the shock absorber 304 as an impact absorbing device includes a pair of gripping bodies 321 and 321 for gripping the horizontal rope material 3 with a predetermined frictional force. A pair of fitting grooves (not shown) to be fitted to the material 3 are formed, and both gripping bodies 321 and 321 are fastened by fastening fixing means 323 and 323 having bolts 323 and nuts 324, and the horizontal rope At the end of the material 3, a stopper 306 is provided to be engaged with the shock absorber 304.

  In response to falling rocks, the gripping bodies 321 and 321 grip the horizontal rope members 3, 3A, 3B, 3C, 3D with a predetermined frictional force, and when the tension more than a predetermined level acts, the horizontal rope members 3, 3A , 3B, 3C, 3D is allowed, and when the transverse rope members 3, 3A, 3B, 3C, 3D are tensioned, the transverse rope members 3, 3A, 3B against the fitting groove. , 3C, 3D can absorb the energy of falling rocks by sliding friction. In addition, after the stopper 306 latches to the holding bodies 321 and 321, the lateral rope members 3, 3A, 3B, 3C, and 3D counteract the energy of falling rocks. In this case, the lateral rope members 3, 3A, 3B, 3C, 3D can be extended by the extra length 3Y of the lateral rope members 3, 3A, 3B, 3C, 3D extending outward from the gripping bodies 321, 321. .

  As described above, in this embodiment, the shock absorbers 304 that grip the ends of the horizontal rope members 3, 3A, 3B, 3C, 3D are provided, and the horizontal rope members 3, 3A, 3B, 3C, 3D have a predetermined tension or more. When received, the horizontal rope members 3, 3A, 3B, 3C, 3D are configured to slide frictionally with respect to the shock absorber 304. Therefore, the horizontal rope members 3, 3A, When a tensile force of a predetermined level or more is applied to 3B, 3C, 3D, the impact energy can be absorbed by the frictional sliding of the lateral rope members 3, 3A, 3B, 3C, 3D with respect to the shock absorber 304.

  23 to 25 has the extra length portion 3Y that can be moved by the force of the falling rock R in this way, the falling rope R causes the lateral rope members 3, 3A, 3B, 3C, 3D to bend backward and a plurality of them. Are supported by the support columns 2, 2,..., The impact force can be efficiently reduced.

  The present invention is not limited to this embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, the cross-sectional shape of the column may be elliptical. Moreover, you may comprise a linear arrangement | positioning part so that it may pass through the rear part of three or more support | pillars.

DESCRIPTION OF SYMBOLS 1 Concrete foundation 2 Support | pillar 3, 3A, 3B, 3C, 3D Horizontal rope material 103, 103A, 103B, 103C, 103D Diagonal arrangement part 104B, 104C, 104D Straight arrangement part

Claims (9)

In the protective fence in which a plurality of support posts are provided at predetermined intervals and a horizontal rope member is provided in multiple stages between the support posts, the horizontal rope member includes a front portion of the support post and a rear portion of the support post adjacent to the support post. A protective fence comprising a diagonally arranged portion that passes therethrough, and at least one set of the obliquely arranged portions of horizontal rope members provided in multiple stages is arranged in an intersecting manner in the front-rear direction between adjacent struts. 2. The protective fence according to claim 1, wherein at least one set of the diagonally arranged portions of the horizontal rope members vertically adjacent to each other is arranged in an intersecting manner in the front-rear direction between adjacent struts. The guard fence according to claim 1, wherein a pair of the diagonally arranged portions located in substantially the same plane are arranged in an intersecting manner in the front-rear direction between adjacent struts. The protective fence according to any one of claims 1 to 3, wherein the horizontal rope member is provided with a linear arrangement portion that passes between rear portions of adjacent struts. The protective fence according to any one of claims 1 to 4, wherein the horizontal rope member slides on a front portion of the support column. 6. The protective fence according to claim 5, wherein a front portion of the support column is formed in a curved shape. The protective fence according to claim 6, wherein a radius of curvature of a front portion of the support column is 10 times or more of a diameter of the horizontal rope member. A loading member having a loading surface is provided on an end portion of the horizontal rope member or a member connected to the end portion, a loading surface is provided on the support column, and a ring material is disposed between the loading surfaces. The protective fence according to any one of claims 1 to 7. A shock absorber that grips an end of the horizontal rope member is provided, and when the horizontal rope member receives a tension of a predetermined level or more, the horizontal rope member is configured to frictionally slide with respect to the shock absorber. The protective fence according to any one of claims 1 to 7, characterized in that:

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