JP2005282244A - Guard fence - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a guard fence superior in the shock absorbing effect capable of smoothly transmitting tension of a rope body to columns. <P>SOLUTION: The columns 2, 3 and 2 are erected at an interval. Rope materials 4 and 4' being the rope body are vertically installed at an interval between these columns 2, 3 and 2. The two rope materials 4 and 4' are gripped by predetermined frictional force by a shock absorber 21. When tension of a predetermined value or more acts on the rope materials 4 and 4', sliding of the rope materials 4 and 4' is allowed. A guide groove 12 is arranged for guiding one rope material 4 along the column 3. When the tension of the predetermined value or more acts on the rope materials 4 and 4' by impact force such as a falling rock, the rope materials 4 and 4' slide to the shock absorber 21, and absorb the impact force by friction energy by this sliding. In this case, even if the rope material 4 slides to the column 3, since the rope materials 4 and 4 slide along the guide groove 12, unreasonable force is not applied to the rope material 4 and the column 3, so that the rope materials can smoothly slide. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a protective fence that is constructed on a slope portion of a mountainside, etc., and receives snow and rocks to prevent it from falling or flowing into a road or the like.

  Conventionally, a protective fence is known which is constructed on a slope of a mountainside and receives falling rocks and snow, etc., and prevents falling and inflowing onto a road or the like. For example, JP-A-7-197423 Proposed protection fences such as falling rocks with a perforated hole at an interval in the slope, and pipe struts built in the perforated hole side by side, and a multi-stage cable and wire mesh stretched to each pipe strut Has been.

  This guard fence is formed with a plurality of cable mounting holes for passing cables through the end pipe struts arranged at both ends, and the intermediate pipe struts arranged in the middle part correspond to the cable mounting holes Thus, a bolt for fixing the cable is formed. Then, after attaching the end fitting with a tension function to the cable attachment hole and connecting both ends of the cable to this end fitting, the fixing plate is nut-fastened to the bolt formed on each intermediate pipe post, In addition to fixing the cables that span the intermediate pipe struts, a wire mesh is secured to each pipe strut.

  Such a guard fence is to catch the falling rock, snow, etc. on each pipe column and the cable that supports it, but the pipe column that supports the mesh is only connected by multiple cables. The connection strength between the plurality of pipe struts is weak, and if an impact such as falling rocks or snow is applied to some intermediate pipes, the intermediate pipes may be damaged. Furthermore, the cables erected on each intermediate pipe strut are also fixed only to the intermediate pipe strut, so if a strong impact is applied to some cables, there is a risk that the cable will be cut due to a strong tensile force. Therefore, there is a problem that the tension strength of the wire mesh and the cable is weak. Also, even if the cable or wire mesh stretched on the pipe strut is partially damaged, the laying strength is significantly reduced. However, the conventional guard fence has a continuous cable and wire mesh over the entire length of the guard fence. The cable and the wire mesh could not be partially exchanged, and the maintenance work was troublesome, and the cost was uneconomical.

On the other hand, as a means to absorb impacts such as falling rocks by converting them into frictional energy, support columns are provided at predetermined intervals, and horizontal rope materials are moored in a state that allows horizontal sliding between each support column. Both ends of the cable are fixed, shielded between wires by a wire net hooked on a horizontal rope material, and an extra length portion formed by polymerizing the rope material in the middle of the horizontal rope material, and an extra length portion. A buffer that absorbs tension by extending the extra length of the horizontal rope material while maintaining a constant frictional force when a tension higher than the set tension is applied to the horizontal rope material due to the clamping device that clamps with a constant force A shock absorbing fence (for example, Patent Document 2 and Patent Document 3) in which a slab is formed has been proposed.
JP-A-7-197423 JP-A-6-173221 JP-A-6-336709

  The shock absorber fence can absorb the shock by sliding the buffer part formed in a part of the horizontal rope material before transmitting the shock to the column, and remarkably reduce the load load of the column compared to the conventional. Can do.

  By the way, even with this shock absorbing fence, after the shock absorber slides, the tension of the horizontal rope material is applied to the support column, but if the horizontal rope material is simply moored to the support column, it is impossible to force the anchoring part of the support column and horizontal rope material. Force may be applied, and the force may not be transmitted smoothly to the column.

  Then, an object of this invention is to provide the protective fence which can transmit the tension | tensile_strength of a cable body smoothly to a support | pillar, and was excellent in the impact absorption effect.

  The invention of claim 1 is a protective fence in which struts are erected at intervals, and a cord-like body is erected between the struts in the vertical direction. And a shock absorber that absorbs an impact by allowing sliding of the cable body when a predetermined tension is applied to the cable body, and one of the cable bodies along the column. And a guiding unit for guiding.

  According to a second aspect of the present invention, the guide portion has a front / rear curved portion protruding in the front / rear direction.

  According to a third aspect of the present invention, the guide portion has a vertically curved portion that protrudes in the vertical direction.

  According to a fourth aspect of the present invention, a stopper that can be locked to the shock absorber is provided at an end portion of the cable body.

  According to a fifth aspect of the present invention, the shock absorber is disposed in the vicinity of the intermediate strut, and the ends of the strips are attached to both struts sandwiching the intermediate strut.

  According to the structure of claim 1, when a predetermined tension or more is applied to the rope body by an impact force such as falling rocks, the rope body slides against the shock absorber, and the impact is generated by the frictional energy generated by the sliding. Absorb power. At this time, even if the striated body slides with respect to the support column, the slidable body slides along the guide member. Therefore, the slidable body and the support column can slide smoothly without applying excessive force. .

  Moreover, according to the structure of Claim 2, even if a rock fall etc. are received on the front, a rope body moves back centering on a rock fall location, and even if the direction of a rope body changes to the back side with respect to the construction direction, Since the cord body changes its direction along the front and rear curved portion, an excessive force is not applied to the cord body in the guide portion.

  Further, according to the configuration of claim 3, even if the front surface receives falling rocks or the like and the direction of the ridge changes in the vertical direction with respect to the erection direction, the direction of the ridge changes along the vertical bending portion. Therefore, an excessive force is not applied to the striated body in the guide portion.

  Moreover, according to the structure of Claim 4, a rope body slides until each stopper latches to a buffer.

  According to the fifth aspect of the present invention, after the rope body slides until the stopper is locked to the shock absorber, the rope bodies between the struts on both sides are integrated to transmit the tension to the struts. The impact force can be absorbed by the deformation of the columns.

  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 using a protective fence that is a shock absorbing fence different from the conventional one, an unprecedented protective fence is obtained, and each of the protective fences is described.

  Hereinafter, Embodiment 1 of the guard fence of the present invention will be described with reference to FIGS. The protective fence 1 has intermediate pipe struts 3 arranged at intervals between terminal pipe struts 2 arranged on both sides, and a rope member as a cord-like body spaced vertically on these pipe struts 2, 3, 2. 4 and 4 'are installed in multiple stages, and a wire mesh 5 knitted with a metal wire is stretched as a protective mesh body. For example, a concrete foundation 7 is provided on a slope of a mountainside, and the concrete foundation 7 is constructed to provide snow. It is intended to accept or fall rocks.

  The terminal pipe strut 2 and the intermediate pipe strut 3 are built on a foundation 7 such as concrete. These end pipe struts 2 and intermediate pipe struts 3 are formed of steel pipes having a circular cross-sectional shape. Moreover, the terminal pipe support | pillar 2, the intermediate | middle pipe support | pillar 3, and the connecting rod 6 are formed of the steel pipe with a circular cross-sectional shape. The connecting rod 6 has a circular cross section, and ends of the connecting rod 6 are connected to the terminal pipe column 2 and the intermediate pipe column 3 so as to be pivotable in the front-rear direction and the vertical direction by the pivot coupling mechanism 8.

  This example shows a two-span structure in which three struts 2, 3 and 2 are a set of units, and two rope members 4 and 4 'are used at each stage in the set of units. The intermediate pipe support 3 is provided with a guide member 11 for guiding the rope material 4. The guide member 11 has a substantially box-like shape in the left-right direction, and includes a substantially left-right guide groove 12 that guides the rope member 4 in a substantially horizontal direction. The guide groove 12 has an opening 12A on the front surface of the guide member 11, and the rear surface of the guide groove 12 is formed with a front curved portion 13 whose center in the left-right direction is convex forward, and the upper and lower surfaces of the guide groove 12 are An upper curved portion 14 and a lower curved portion 15 that are convex at the center in the left-right direction are formed downward and upward. At the narrowest portions of the upper and lower curved portions 14 and 15, the distance between them is set to be approximately the same as the diameter of the rope member 4. It is preferable that the curved portions 13, 14, 15 are in line contact with the rope material 4.

  The guide member 11 includes a lid 16 that closes the opening 12A, and an engagement recess 17 that engages with the outer periphery of the support column 3 is formed on the rear surface of the guide member 11. 17 and the front curved portion 13 form an arc shape with the support column 3 as the center. Then, the end of the upper and lower U-bolts 18 covered with the lid 16 is put on the front surface of the guide member 11, and the upper and lower left and right sides of the guide member 11 and the lid 16 are inserted, and a nut 19 is inserted into the end. The guide member 11 is fixed to the column 3 by screwing together. In this manner, the lid body 16 can be attached simultaneously with the attachment of the guide member 11 to the column 3.

  One end side 4A of the rope member 4 is inserted into the guide groove portion 11, the other end side 4B is attached to one of the adjacent struts 2, and the one end side 4A is gripped by a buffer 21 with a predetermined frictional force. A stopper 22 is provided on the surface. The shock absorber 21 is disposed in the vicinity of the intermediate pipe column 3 between the columns 2 and 3. Also, the other end 4B ′ of the other rope member 4 ′ is attached to the other adjacent support column 2 and its one end side 4A ′ is overlapped with the one end side 4A of the rope member 4, and the buffer 21 Gripping with frictional force, a stopper 22 is provided at one end. The other rope member 4 ′ is shorter than the interval between the columns 3 and 2, and has such a length that the stopper 22 is positioned on the other end side of the guide member 11 (the column 2 on the right side in FIG. 1 of the column 3). When the rope material 4 slides, the shock absorber 21 hits the stopper 22 of the rope material 4 ′ and the shock absorber 21 does not hit the guide member 11.

  As shown in FIG. 6 and the like, the shock absorber 21 has pressure contact grooves 24, 24 formed in two divided main bodies 23, 23, and the rope members 4, 4 'are arranged between the pressure contact grooves 24, 24, The main bodies 23 and 23 are fastened to each other by fastening means 25 such as bolts, and the rope members 4 and 4 'are gripped with a predetermined frictional force.

  Further, rope material attaching means is provided on the terminal pipe strut 2 and the outer periphery, and attachment plates 31 of the attaching means are fixed corresponding to the number of cables 4. A hole 33 for attaching the end fitting 32 of the rope member 4 is formed in the attachment plate 31. Note that two end fittings 32 can be hooked on the holes 33 on the mounting plate 31. The rope material attaching means attaches the end portions of the rope materials 4 and 4 'to the support column 2 so as to be swingable, and attaches the rope materials 4 and 4' in a state in which movement of the rope materials 4 and 4 'is restricted.

  The end fitting 32 is composed of a U-shaped joint fitting 34 and a plate 36 fixed to the joint fitting 34 with a nut 35. The plate 36 is inserted with a threaded portion 34A formed at the base of the joint fitting 34. A pair of holes 37 are formed, and an insertion hole 38 through which the rope material 4 is passed is formed between the holes 37 and 37. The insertion hole 38 is formed with a smaller diameter than the stopper 22 fixed to the ends of the rope members 4 and 4 ′ so as to prevent the stopper 22 from coming off.

  The construction method of the guard fence 1 comprised as mentioned above is demonstrated. The protective fence 1 is installed on, for example, a slope of a mountainside, and constructs a concrete foundation 7 and embeds each pipe support 2 and 3 in the concrete foundation 7. In each of the pipe struts 2, 3, 2 built in this way, a terminal pipe strut 2 disposed on both sides of the protective fence 1 and an intermediate strut 3 between these terminal pipe struts 2 are disposed in a straight line. And rope material 4,4 'is constructed between each pipe support | pillar 2,3,2. That is, the joint fitting 34 is passed through the hole 33 formed in the mounting plate 31 fixed to each pipe support 2, 2, and the stopper is provided at the end of the rope member 4 through both ends of the rope member 4 of the insertion hole 38 formed in the plate 36. Fix 22 Further, in the support column 3, the one end side 4 </ b> A of the rope material 4 is inserted into the guide groove 12 of the guide member 11. Thereafter, the rope member 4 disposed between the pipe struts 2, 3, 2 is tensioned by tightening the nut 35 to the screw portion 34 through the holes 37 of the plate 36 through the screw portions 34 A of the joint fitting 34. After the rope members 4, 4 ′ are thus installed between the pipe struts 2, 3, 2, the wire mesh 5 is attached to the pipe struts 2, 3, 2 and the rope member 4 by fixing brackets (not shown). In addition, the column 3 and the column 2 (not shown) are arranged in the same manner next to the columns 2 and 2 on both sides in FIG. 1, thereby forming one set of units, and the column 2 between the columns 3 and 3. Two terminal fittings 32 are provided.

  Next, the operation of the above structure will be described. When a falling rock is received by the wire mesh 5 between the support columns 2, 3 and 2, and a tension of a predetermined level or more acts on the rope members 4 and 4 ′ by the impact force of the falling rock, The rope material 4 slides with respect to the buffer 21 and the impact force is absorbed by the frictional energy generated by the sliding. The sliding is performed until the stoppers 22, 22 provided on the one end sides 4 </ b> A, 4 </ b> A ′ hit the shock absorber 21. At this time, even if one end side 4A of the rope member 4 slides to the left side in the figure with respect to the support column 3, the rope member 4 slides along the guide groove 12, so that excessive force is applied to the rope member 4 and the support column 3. It can slide smoothly without adding. Further, when falling rock or the like is received between the columns 2, 3 and 2, the rope members 4 and 4 'move later around the rock falling part, and as shown by the one-dot chain line in FIG. , 3, 2), the direction of the rope member 4 changes along the front-rear curved portion 13, so that the rope member 4 cannot be used in the guide groove 12. Power is not added. Moreover, even if the direction of the rope material 4 changes in the vertical direction with respect to the erection direction, such as when the falling rock hits the wire mesh 5 or when the opening force is applied to the upper and lower rope materials 4 and 4 due to the falling rock, 3, the rope material 4 changes its direction along the up and down curved portions 14, 15, so that no excessive force is applied to the rope material 4 in the guide groove 12.

  Then, after the stoppers 22 and 22 provided on the one end side 4A and 4A 'hit the shock absorber 21, the tension of the rope members 4 and 4' is applied to the support columns 2 and 2, and the support member 3 has the rope material 4 When a component force in the front-rear direction of the tension is applied and a force exceeding the bending stress of the columns 2, 3 and 2 is received, the column 2, 3 and 2 are bent and fallen, and the impact force is absorbed.

  Thus, in this embodiment, corresponding to claim 1, the support columns 2, 3 and 2 are erected at intervals, and the cord-like bodies are spaced vertically between these support columns 2, 3 and 2 In the protective fence on which the rope members 4 and 4 'are installed, the two rope members 4 and 4' are gripped with a predetermined frictional force, and the rope members 4 and 4 'are subjected to a tension higher than a predetermined level. Since the shock absorber 21 that absorbs the impact by allowing the sliding of the materials 4 and 4 ′ and the guide groove 12 that guides the one rope material 4 along the support column 3, the impact such as falling rocks is provided. When a predetermined tension or more acts on the rope members 4 and 4 ′ by the force, the rope members 4 and 4 ′ slide with respect to the shock absorber 21, and the impact force is absorbed by the frictional energy generated by the sliding. At this time, even if the rope member 4 slides with respect to the support column 3, the rope members 4 and 4 slide along the guide groove 12, so that an unreasonable force is not applied to the rope member 4 and the support column 3. Can slide.

  In this way, in this embodiment, corresponding to claim 2, since the guide portion 11 has the front and rear curved portion 13 projecting in the front-rear direction, the front surface receives a fallen stone and the rope material 4 has a fallen stone location. Even if the rope member 4 moves to the center and the direction of the rope member 4 changes to the rear side with respect to the installation direction, the rope member 4 changes its direction along the front-rear curved portion 13, so that the rope member 4 in the guide groove 12 is impossible. No extra power is added.

  In this way, in this embodiment, corresponding to claim 3, the guide groove as the guide portion has the vertically curved portions 14 and 15 protruding in the vertical direction. On the other hand, even if the direction of the rope member 4 changes in the vertical direction, the rope member 4 changes its direction along the up and down curved portions 14 and 15, so that an unreasonable force is not applied to the rope member 4 in the guide groove 12. .

  In this way, in this embodiment, corresponding to claim 4, since the stoppers 22 that can be locked to the shock absorbers 21 are provided at the ends of the rope members 4 and 4 ', each of the stoppers 22 corresponds to the shock absorber 21. The rope members 4, 4 'slide until they are locked.

  In this way, in this embodiment, corresponding to the fifth aspect, the shock absorber 21 is disposed in the vicinity of the intermediate column 3, and the rope members 4, 4 are attached to the columns 2, 2 on both sides sandwiching the intermediate column 3. Since the end of 'is attached, the rope members 4 and 4' slide until the stopper 22 is locked to the shock absorber 21, and then the rope members 4 and 4 'between the support columns 2 and 2 on both sides are integrated. The tension can be transmitted to the columns 2, 3, and 2, and the impact force can be absorbed by the deformation of the columns 2, 3, and 2.

  FIG. 7 shows a second embodiment of the present invention. The same reference numerals are given to the same portions as those of the first embodiment, and detailed description thereof is omitted. As shown in FIG. 3, 3, 3, and 2 are shown as one set of units, and three rope members 4 ′, 4, 4 ′ are used in each stage in one set of units. The intermediate pipe support 3 is provided with a guide member 11 for guiding the rope material 4. The rope member 4 located in the middle is formed longer than the interval between the columns 3 and 3, and both end sides 4T and 4T thereof are guided by the guide members 11 and 11 of the columns 3 and 3, respectively, and further, both end sides 4T and 4T. Are gripped by the respective shock absorbers 21 and 21 with a predetermined frictional force, and stoppers 22 are respectively provided at the ends thereof. Each shock absorber 21 holds one end side 4A 'and 4A' of the rope member 4 'attached to the support columns 2 and 2 on both sides with a predetermined frictional force.

  Then, between the support posts 2, 3, 3, and 2, a rock fall is received by the wire mesh 5, and when the tension more than a predetermined level acts on the rope member 4 due to the impact force of the fallen rock, the rope member 4 slides against the shock absorber 21. It moves and absorbs the impact force by the frictional energy by this sliding. The sliding is performed until the stoppers 22, 22 provided on the one end side 4 </ b> A and the end portion 4 </ b> T hit the shock absorber 21. Further, in this example, two shock absorbers 21 and 21 are provided in one unit, and the rope members 4 ', 4 and 4' are gripped at four locations of one end side 4A, both end sides 4T and 4T, and one end side 4A. Even if any of these rope members 4 ′, 4 and 4 ′ receives the impact force of falling rocks, frictional sliding occurs at four locations, so that the impact absorption effect is excellent due to the friction force.

  FIG. 8 shows a third embodiment of the present invention. The same reference numerals are given to the same parts as those of the first embodiment, and the detailed description is omitted. As shown in FIG. In addition, there are inclined portions 13A and 13A on both sides of the front curved portion 13, and in this example, too much force is applied to the rope member 4 in the guide groove 12 by the front curved portion 13 having the inclined portions 13A and 13A. There is no participation.

  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.

It is a front view of the principal part of the guard fence which shows Example 1 of this invention. It is a front view around an intermediate | middle support | pillar and a shock absorber same as the above. 3A is a plan sectional view of the guide member, and FIG. 3B is a front view of the guide member in a state where the lid is removed. It is a front view of a protection fence same as the above. It is a front view of the upper part of the support | pillar of both sides same as the above. It is sectional drawing of a shock absorber same as the above. It is a front view of the principal part of the guard fence which shows Example 2 of this invention. It is a top view of the guide member which shows Example 3 of this invention.

Explanation of symbols

1 Guard fence 2 End pipe support (supports on both sides)
3 Intermediate pipe strut (intermediate strut)
4,4 'rope material (cord-like body)
5 Wire mesh (protective mesh)
12 Guide groove (guide section)
13 Front curve
14 Upper curve
15 Lower curve
21 Shock absorber
22 Stopper

Claims (5)

In a protective fence in which struts are erected at intervals, and a rope-like body is erected between the struts in the vertical direction, the two cords are gripped with a predetermined friction force, and the cords are A shock absorber that absorbs an impact by allowing sliding of the strip body when a predetermined tension or more acts on the strip body, and a guide portion that guides one of the strip bodies along the support column. A protective fence characterized by that. The protective fence according to claim 1, wherein the guide portion has a front-rear curved portion protruding in the front-rear direction. The protective fence according to claim 1, wherein the guide portion has a vertically curved portion protruding in a vertical direction. The protective fence according to claim 1, wherein a stopper that can be locked to the shock absorber is provided at an end of the rope body. The protective fence according to claim 4, wherein the shock absorber is disposed in the vicinity of the intermediate strut, and ends of the striated body are attached to both struts sandwiching the intermediate strut.

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