JP4613864B2 - Guard fence and its construction method - Google Patents

Description

The present invention relates to a protective fence that is constructed on a slope or the like of a mountainside and receives snow, rocks, and the like to prevent falling and inflowing onto a road or the like.

Conventionally, protective fences have been known that are constructed on slopes of mountainsides, etc. to prevent falling or inflowing on roads etc. by receiving falling rocks or snow, etc. The horizontal rope material is moored in a state that allows horizontal sliding, and both ends of the horizontal rope material are fixed and shielded by a wire net that is hooked on the horizontal rope material between the supports. The horizontal rope material is constant when a tension exceeding the set tension is applied to the horizontal rope material by the extra length part formed by polymerizing the rope material on the way and the clamping tool that clamps the extra length part with a constant force. An impact absorbing fence (for example, Patent Document 1) that forms a buffer part that absorbs tension by extending the extra length while maintaining the frictional force of the column, or a column is set up at intervals on the foundation, Guard fence (for example, Patent Document 2) with protective nets stretched on It has been proposed.

In the shock absorbing fence, the support column is made of a rigid member such as H steel, and a hole for locking the horizontal rope member is formed in the upper and lower portions thereof.

Further, in the above-described protective fence, the end of the rope material is swingably connected to the end pipe support by the shock absorber, and the shock absorber includes a pair of grip bodies that grip the rope material with a predetermined frictional force. The body is fastened and fixed by fastening means such as bolts and nuts, and a hole serving as an engaging portion with which the rope member is engaged is provided on the outer peripheral front side of the intermediate pipe column.
Japanese Patent Publication No. 7-18134 JP 2004-19369 A (0031 and 0032 stages)

In the above shock absorbing fence, since the buffer portion is formed in the horizontal rope material between the columns, the horizontal rope material cannot be inserted into the hole of the column after the buffer portion is formed. Similarly, the work of attaching the material is complicated, and similarly, in the above-mentioned protective fence, the end of the rope material is gripped by the shock absorber, and the shock absorber is connected to the terminal rope support. After gripping, the rope material could not be inserted into the hole serving as the engaging portion of the intermediate pipe column, and the work of inserting the rope material into the hole at the site was complicated. In addition, after inserting the rope material into the hole of the intermediate pipe column after inserting the rope material into the hole of the intermediate pipe column in order to tighten the end of the rope material with the gripping body of the shock absorber using a tightening means such as a bolt nut. The work of attaching the gripping body is also complicated, and furthermore, if the tightening force varies for each rope material, there is a possibility that the impact absorbing effect such as falling rocks may be reduced.

Furthermore, since the shock absorbing fence and the protective fence are both inserted through holes in the middle struts of the rope material, the part that hits the hole when an impact such as falling rocks or avalanches is applied to the rope material. However, there was a problem that the force concentrated on the rope material was added, and the rope material was easily damaged from this portion.

Then, this invention aims at providing the protection fence with which the attachment work of a rope material is easy, and also provides the protection fence which can prevent concentration of the force to a rope material in the engaging part with a support | pillar. With the goal.

The invention of claim 1, the strut is erected at intervals, bridged rope member spaced vertically between the posts, engaging the middle of the rope materials to the engagement portion provided on said post In the protective fence in which both ends of the rope member are slidably held by the shock absorber and the shock absorbers on both ends are attached to the column, the engagement portion includes upper and lower engagement members, An insertion receiving portion formed by upper and lower engaging members and capable of inserting the rope material from the length crossing direction, and an opening / closing means for opening and closing the insertion receiving portion, the insertion receiving portion side of the upper and lower engaging members Is formed in a curved shape, and a notch step is formed at the upper end of the upper engagement member and at the lower end of the lower engagement member .

The invention according to claim 2 is that the struts are erected at intervals, and a rope material is erected between the struts in the vertical direction, and the middle of the rope material is engaged with an engaging portion provided on the strut and, in the method of constructing the safety barrier for gripping slidably by bumper providing both ends of the rope member to the post,
After gripping both ends of the rope material with the shock absorber, the shock absorber is provided on the column, and the middle of the rope material is inserted into the engagement portion from the length crossing direction, and the tip of the upper engagement member In this method, a bolt is inserted into a hole in a notch step provided at the lower end of the upper and lower engaging members to engage the rope member .

According to the configuration of claim 1, since it is possible to insert the rope material from the direction intersecting the length direction into the open insertion receiving portion, it is not necessary to insert the tip of the rope material into the hole, The middle of the rope member can be easily engaged with the intermediate strut. Therefore, attachment work on both ends of the rope material can be easily performed.

Moreover, according to the structure of Claim 1 , since it can attach a shock absorber to the both ends of a rope material before attaching to a support | pillar, a shock absorber is installed in the place suitable for work, such as a flat ground of a factory or a field. It can be attached and workability is improved. In particular, in a protective fence using a shock absorber that requires adjustment and setting of the tightening force and the like, the workability of attaching the rope material can be improved.

According to the configuration of claim 1 , even if an impact such as falling rock or avalanche is applied to the rope material, the rope material abuts on the curved portion of the engagement member. Can be prevented from concentrating.

Moreover, according to this invention , even if a falling rock collides with the engaging part of a support | pillar, a falling rock does not collide directly with a rope material.

According to the structure of Claim 2 , since it can attach a shock absorber to the both ends of a rope material before attaching to a support | pillar, it attaches a shock absorber in the place suitable for work, such as a flat ground of a factory or the field. This improves the workability of attaching the rope material.

Moreover, according to the structure of Claim 2 , the middle of a rope material can be easily engaged with an intermediate support | pillar.

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 adopting a guard fence different from the conventional one, an unprecedented guard fence and its construction method are obtained, and the guard fence and its construction method are described respectively.

Hereinafter, embodiments of the protective fence according to the present invention will be described with reference to FIGS. The guard fence 1 has a plurality of intermediate pipe struts (intermediate struts) 3 arranged at intervals between terminal pipe struts (terminal struts) 2 arranged on both sides, and is vertically spaced between these pipe struts 2 and 3. In addition, the horizontal rope material 4 is laid in multiple stages, and a wire net 5 knitted with a metal wire is stretched on the front side as a protective net, for example, these columns 2 and 3 are drilled on the slope S of the mountainside It is built in the vertical hole S1. The wire mesh 5 is stretched in front of the rope material 4. The rope material 4 is a wire rope or the like. In this example, two intermediate pipe struts 3 and 3 are arranged between the terminal pipe struts 2 and 2. In this embodiment, description will be made using the protective fence 1 provided with the columns 2, 3, 3, 2 as one unit. However, the columns 3, 3,... Can also be formed.

The terminal pipe strut 2 and the intermediate pipe strut 3 are built on the slope S1 or the like, and the built-in terminal pipe strut 2 and the intermediate pipe strut 3 are connected to each other by a connecting bar 6. The terminal pipe strut 2, the intermediate pipe strut 3, and the connecting rod 6 are formed of steel pipes having a circular cross-sectional shape. The terminal pipe strut 2 and the intermediate pipe strut 3 having such a hollow structure are reinforced by a reinforcing body 8 provided therein. 5 and 6, the reinforcing body 8 is formed shorter than the end pipe strut 2 and the intermediate pipe strut 3, and the end pipe strut 2 and the intermediate pipe substantially correspond to the portion embedded in the vertical hole S1. It is inserted in the lower part of the column 3. The reinforcing body 8 is formed in a polygonal shape. In this embodiment, the reinforcing body 8 has three reinforcing ribs 111, 111, 111 made of plate material arranged in a substantially equilateral triangle, and strip steel plates at the vertices 111S, 111S, 111S of the reinforcing ribs 111, 111, 111. 112, 112, 112 are welded. Further, the width W of the strip-shaped steel plate 112 is at least twice the thickness of the reinforcing rib 111. Further, the strip steel plates 112, 112, 112 of the reinforcing body 8 are attached so as to be able to be inserted through the inner surface of the steel pipe 110 through a slight gap. At the time of manufacturing, after assembling the reinforcing body 8, the reinforcing body 8 is inserted and arranged from one side opening of the steel pipe 110, and the reinforcing body 8 is welded and fixed to the inner surface of the steel pipe 110 on the opening side where a welding rod or the like reaches. The inside is filled with the non-shrink mortar 11. Further, in the steel pipe 110, three reinforcing bars 10, 10, 10 are fixed in contact with the inner surface of the steel pipe 110, located between two vertices of the reinforcing body 8. The rebar 10 is provided with substantially the same length as the reinforcing body 8. The two vertices 111S of the reinforcing body 8 having a triangular cross section and the reinforcing bar 10 are provided on the tensile region side of the pipe struts 2 and 3. That is, when the protective fence 1 receives a fallen stone or the like on the front surface, a force for tilting the support columns 2 and 3 is applied around the lower part, so that the front side of the cross section of the support columns 2 and 3 is a tensile region.

In the present invention, the connecting rod 6 has a circular cross section, and the connecting rod 6 is preferably a filled steel pipe filled with concrete or non-shrink mortar 11 inside the steel pipe, and the end of the connecting rod 6 is used as a terminal pipe column. 2 and the intermediate pipe support 3 are connected to each other by a rotation connecting mechanism 12, 13 so as to be rotatable in the front-rear direction and the up-down direction.

First, with reference to FIG. 8 to FIG. 9, the rotation coupling mechanism 13 provided in the intermediate pipe column 3 will be described. The rotation coupling mechanism 13 is rotatably fitted on the upper portion of the intermediate pipe column 3. A support cap 14, a connecting outer cylinder 15 for inserting and connecting the end of the connecting rod 6, and a rotating connecting part 16, 16A for connecting the support cap 14 and the connecting outer cylinder 15 so as to be rotatable in the vertical direction. With.

The connecting outer cylinder portion 15 is closed on the column side by a closing end 151, and a semi-cylindrical portion 152 on the opening side on the opposite column side is detachably provided, and the end 6A of the connecting rod 6 is provided on the connecting outer cylinder portion 15. By inserting and fastening the anti-cylindrical part 152 to the connecting outer cylinder part 15, the connecting rod 6 is fastened and fixed to the connecting outer cylinder part 15.

The rotation connecting portion 16A includes a lateral pivot 17 made of a bolt or the like that rotatably connects the support cap 14 and the connecting outer cylinder portion 15.

Therefore, the connecting outer cylinder portions 15 on both sides with respect to the intermediate pipe support 3 rotate in the vertical direction around the pivot 17 and can rotate in the front-rear direction around the support cap 14.

Next, as shown in FIGS. 8 and 9, the pivot coupling mechanism 12 has a column cap 14 coupled to the terminal pipe column 2 so as to be able to rotate on a plane. The portion 15 rotates in the vertical direction about the pivot 17 and can be rotated in the front-rear direction about the support cap 14.

In addition, by adjusting the insertion amount of the end portion of the connecting rod 6 to the connecting outer cylinder portion 18, the connecting rod 6 can be adjusted to the interval between the columns 2, 2, and 3.

Further, as shown in FIGS. 8 to 10, an attachment portion 21 for connecting the end of the rope member 4 is provided in the upper and lower stages on the front side of the outer periphery of the end pipe support 2, and the attachment portion 21 has a horizontally long shape. A hole 22 is formed. The end of the rope member 4 is slidably connected to the end pipe support 2 by a buffer 23.

As shown in FIGS. 9 to 12, the shock absorber 23 includes a box 31 that houses the rope member 4 and a plurality of protrusions 32 that press the rope member 4 housed in the box 31. And a fastener 39 that fastens the box 31 and the pressing tool 33. The fastener 39 includes a bolt 39A, a washer 39B, and a nut 39C. As shown in FIGS. 11 and 12, the box 31 includes an attachment hole 34 for attaching the shock absorber 23 to the columns 2 and 3 using U bolts 55 and the like, a gripping groove 35 for pressing the rope material 4, The grip groove 35 has a guide groove 36 for guiding the rope material 4, a recess-shaped escape portion 37 for releasing a plurality of projections 32 of the pressing tool 33, and a hole for passing a bolt 39 A for pressing the pressing tool 33. . On the bolt insertion side of the box 31 is provided a detent projection 38 that serves as a detent for the bolt 39A. The pressing tool 33 is provided with a plurality of protrusions 32 on one side of a plate or block, and presses the rope material 4 against the box 1. A plurality of the protruding portions 32 are arranged in the longitudinal direction of the rope member 4. When the rope member 4 is pressed against the protrusion 32 of the pressing tool 33, the pressing surface 32 </ b> A is set in a semicircular shape so that the direction of the acting force is directed toward the center of the rope member 4. Combined with the shape, the strands of the rope material 4 do not protrude from the groove. The box body 31 and the pressing tool 33 constitute a grip body for gripping the rope material 4.

Then, the rope member 4 is accommodated in the grip groove 35 of the box body 31 and the pressing surface 32A of the protrusion 32 of the pressing tool 33 is placed on the rope member 4 so that the pressing force can be exerted from the back side of the box body. The bolt 39A is passed through, communicated with the pressing tool 33, and tightened through a washer 39B and a nut 39C. At this time, the head of the bolt 39A hits the anti-rotation protrusion 38, and co-rotation is avoided. The rope member 4 is guided by the trumpet-shaped portion of the guide groove 36, and the rope member 4 is pushed into the center portion of the groove by the semicircular pressing surface 32A of the protrusion 32 of the pressing tool 33. The gripping force of the rope member 4 is determined by the tightening force of the nut 39B that presses the pressing tool 33. Further, the middle of the U-bolt 40 is inserted into the mounting holes 34, 34, and nuts 41, 41 are screwed into both end portions 40T, 40T.

When an impact force acts on the rope member 4 due to factors such as falling rocks or a collision of a traveling vehicle in the protective fence provided with such a shock absorber 23, the impact force acts on the rope member 4 as a tension. The tension is transmitted to the buffer 23. The rope member 4 is gripped by the frictional resistance between the pressing surface 32A of the protrusion 32 of the pressing tool 33 and the gripping groove 35 of the box 31. Therefore, when the tension acting on the rope member 4 is equal to or less than the set frictional force, the rope member 4 does not slide. When the tension acting on the rope material 4 exceeds the set friction force, the rope material 4 starts to slide, and the impact energy is effectively attenuated by the sliding friction resistance.

Then, in the shock absorber 23, as shown in FIG. 12, the box upper surface 31A is fastened with the fastener 39 tightened and the rope member 4 is gripped with a predetermined frictional resistance by the box 31 and the pressing tool 33. There is a gap K between the lower surface 33A of the pressing tool 33, and there is a gap between the pressing surface 32A of the projection 32 and the upper end 35A of the holding groove 35, that is, tightening is further performed in the holding state. It has a tightening allowance. Therefore, in this example, the shock absorber 23 that can set the frictional resistance by adjusting the tightening force of the fastener 39 is used.

As shown in FIGS. 9 and 10, a stopper 42 that can be locked to the shock absorber 23 is provided at the end of the rope member 4. The stopper 42 tightens the rope member 4. The box 31 and the pressing tool 33 are locked.

Further, a plurality of dispersion maintaining devices 51 for dispersing the impact energy applied to the rope material 4 are provided between the support columns 2, 3, 3, and 2. In this example, as shown in FIGS. A dispersion maintaining device 51 is provided between 2, 3, 3 and 2, respectively. As shown in FIG. 13 and the like, this distributed position device 51 has a longitudinal connecting member 52, which is composed of a flat bar or the like, and corresponds to each rope member 4 and has a U-bolt insertion hole 53. 53, 53, 53 are formed side by side, and the connecting member 52 is provided with receiving seats 54, 54 corresponding to the insertion holes 53, 53, 53, 53 arranged vertically. The end portion of the U bolt 55 is inserted into the receiving seat 54 and the insertion hole 53, and the nut 56 is screwed into the end portion to sandwich the rope member 4 between the receiving seat 54 and the U bolt 55. . Further, through holes 52A and 52B are formed in the upper part of the connecting member 52 at intervals in the vertical direction.

As shown in FIG. 14, the dispersion position device 51 is connected to the connection rod 6 in a suspended state by a suspension member 57, and the suspension member 57 includes an outer ring 58 that is externally attached to the connection rod 6. . The flange edges 59, 59 project from the opening of the outer ring 58 in a substantially horizontal front, and bolt insertion holes 59A, 59A are formed in the flange edges 59, 59. A horizontal side portion 61 of a substantially L-shaped connecting plate 60 is inserted between the edge flange portions 59, 59. The horizontal side 61 corresponds to the bolt insertion hole 60 and has a long hole 62 which is long in the front-rear direction. With the horizontal side 61 sandwiched therebetween, the bolt 63 is inserted into the bolt insertion hole 59A and the long hole 62, and the nut 63A is tightened to fix the outer ring 58 to the connecting rod 6 and The connecting plate 60 is fixed to the ring 58. In this case, the longitudinal position of the connecting plate 60 can be adjusted by the long hole 62. Further, a long hole 65 that is long in the vertical direction is formed in the vertical side portion 61S of the connecting plate 60, and a bolt 66 is inserted into the long hole 65 from the rear surface side of the vertical side portion 61S. The connecting member 52 is suspended and fixed to the connecting rod 6 by being inserted into the through hole 52B of the connecting member 52 and screwing the nut 66A into the bolt 66. Further, a wire mesh fixing plate 67 is used to fix the wire mesh 5, and this wire mesh fixing plate 67 is provided with through holes 68, 68A in the upper and lower sides. Then, the bolt 66 portion protruding forward from the nut 66A is inserted into the wire mesh 5 and through the through hole 68A, and the nut 66B is screwed into the inserted bolt 66 portion. Bolts 69 are inserted into the through holes 52A, the bolts 69 are inserted into the metal mesh 5 and the through holes 68 of the metal mesh fixing plate 67, and the nuts 69A are screwed together, whereby the upper portion of the connecting member 52 and the metal mesh fixing plate 67 are The wire mesh 5 is clamped and fixed between the two.

Next, the engaging portion 71 of the intermediate pipe support 3 which is one of the characteristic configurations of the present invention will be described in detail. As shown in FIGS. 1 and 2, the engaging portion 71 is provided in multiple stages on the front side of the steel pipe 110 of the intermediate pipe column 3 corresponding to the rope member 4, and engage members 72, 72 that form a pair of upper and lower sides. The engaging members 72, 72 are made of a round bar having a circular cross section, and the round bar is made of steel or the like, and is welded to the outer periphery of the steel pipe 110 of the intermediate pipe column 3. Between the upper and lower engaging members 72, 72, an insertion receiving portion 73 into which the rope member 4 can be inserted from the side is formed. The cylindrical outer peripheral surfaces 72G and 72G of the engaging members 72 and 72 are positioned on the insertion receiving portion 73 side. In addition, a notch step 74 is formed at the upper end of the upper engagement member 72, and a notch step 74 is formed at the lower end of the lower engagement member 72 so that the upper and lower notch steps 74, 74 are formed. Through holes 75 and 75 are formed in the engaging members 72 and 72 at positions corresponding thereto, and bolts 76 as opening / closing means are inserted into the through holes 75 and 75, and nuts 77 and 77A are screwed into the bolts 76. Accordingly, the insertion receiving portion 73 can be closed, and conversely, the insertion receiving portion 73 can be opened by removing the nuts 77 and 77A and removing the bolt 76.

Therefore, when using the shock absorber 23 that requires the tightening force of the fastener 39 as described above, before attaching the rope member 4 to the support columns 2 and 3 in a flat place in the factory or the field, The rope member 4 can be gripped by the box 31 and the pressing tool 33, and the frictional force can be easily set. After gripping both ends of the rope member 4 with the box 31 and the pressing tool 33 in this way, the U bolt 40 is inserted into the hole 22, and the box 31 and the pressing tool 33 are attached to the U bolt 40, and the terminal The end of the rope material 4 is attached to the pipe struts 2 and 2, and the rope material 4 is inserted from the side into the insertion receiving portion 73 of the intermediate pipe strut 3 in the middle of the rope material 4. By closing the insertion receiving portion 73 with the nuts 77 and 77A, the rope material 4 can be provided in multiple stages. As shown in FIG. 8, U-bolts 55 of shock absorbers 23 can be connected to both sides of the holes 22 of the attachment portion 21 of the terminal pipe strut 2, and the terminal pipe strut 2 on the left side in FIG. An intermediate pipe strut 3 can be provided on the right side of.

In the figure, reference numeral 81 denotes an attachment member for attaching the wire mesh 5 to the rope member 4. A coil is used for the attachment member 81. The horizontal rope member 4 is inserted into this coil, and the coil is rotated to engage with the wire mesh 5. It has stopped.

Further, a mounting portion 82 is provided on the upper front side of the support columns 2 and 3, and a U-bolt 40 of the shock absorber 23 holding the storage rope material 83 is connected to a hole of the installation portion 82, so that the storage rope material The tip of 83 is connected to the front slope S by a lock port 84.

In this way, in this embodiment, in correspondence with claim 1, the columns 2, 3, 3, and 2 are erected at intervals, and the columns 2, 3, 3, and 2 are spaced vertically. In the protective fence in which the rope members 4 and 4 are installed and the rope member 4 is engaged with the engaging portion 71 provided on the support columns 3 and 3 in the middle of the rope member 4, the engaging portion 71 includes the upper and lower engaging members 72 and 72. Since it includes an insertion receiving portion 73 formed by these upper and lower engaging members 72, 72 and capable of inserting the rope member 4 from the length crossing direction, and a bolt 76 serving as an opening / closing means for opening and closing the insertion receiving portion 73, it is opened. The rope member 4 can be inserted into the insertion receiving portion 73 in a state where the rope member 4 intersects the length direction, and it is not necessary to insert the tip of the rope member 4 into a hole or the like. It can be easily engaged with the columns 3 and 3. Therefore, the attachment work of the both ends of the rope material 4 can also be performed easily.

In this way, in this embodiment, corresponding to claim 2, both ends of the rope member 4 are slidably held by the shock absorber 23, and the shock absorbers 23, 23 on both ends are supported by the support columns 2, 2. Since the shock absorbers 23 and 23 can be attached to both ends of the rope material 4 before being attached to the support columns 2 and 2 of the terminal, the shock absorbers 23 and 23 can be buffered at a place suitable for work such as a flat ground in a factory or the field. The tool 23 can be attached, and workability is improved. In particular, the workability of attaching the rope member 4 can be improved in the protective fence using the buffer 23 that requires adjustment and setting of the tightening force and the like.

Further, in this embodiment, corresponding to claim 3, the outer peripheral surfaces 72G and 72G on the insertion receiving portion 73 side of the upper and lower engaging members 72 and 72 are formed in a curved shape. Even when an impact such as avalanche or avalanche is applied to the rope member 4, the rope member 4 abuts against the outer peripheral surfaces 72G and 72G which are curved portions of the engaging members 72 and 72. It is possible to suppress the concentration of stress on the surface.

In this way, in this embodiment, corresponding to claim 4, the engaging members 72, 72 are made of steel, and the tip thereof is located outside the rope member 4 inserted into the insertion receiving portion 73. Even if a falling rock collides with the engaging portion 71 of the support column 3, the falling rock does not directly collide with the rope material 4.

In this way, in this embodiment, corresponding to claim 5, the support columns 2, 3, 3, 2 are erected at intervals, and the support columns 2, 3, 3, 2 are spaced vertically. The rope members 4 and 4 are erected, the middle of the rope member 4 is engaged with the engaging portion 71 provided on the support column 3, and both ends of the rope member 4 are provided with the shock absorbers 23 provided on the support columns 2 and 2, In the construction method of the protective fence gripped slidably by 23, both ends of the rope material 4 are gripped by the box 31 and the pressing tool 33 as the gripping body of the shock absorber 23, and then the shock absorber 23 is provided on the column 2 Since the middle part of the rope member 4 is engaged with the engaging portion 71, the shock absorbers 23 can be attached to both ends of the rope member 4 before being attached to the support column 2 of the terminal. The shock absorber 23 can be attached at a place suitable for the work such as, and the attachment workability of the rope member 4 is improved.

In this way, in this embodiment, the rope material 4 is inserted into the engaging portion 71 from the length crossing direction in correspondence with the sixth aspect, so that the middle of the rope material 4 can be easily engaged with the intermediate strut. Can be combined.

Further, as an effect on the embodiment, since the terminal support column 2 is provided with the holes 22 capable of connecting the shock absorbers 23, 23 on both sides, the terminal support column 2 that connects the shock absorber 23 only on one side (the right side in FIG. 1). ) And the terminal struts 2 (left side in FIG. 1) at both ends connecting the shock absorbers 23, 23 on both sides can be used as the same structure.

Further, by connecting the upper portions of the support columns 2, 3, 3, and 2 with the connecting rod 6, the connection strength of the support columns 2, 3, 3, and 2 can be increased. In the portal structure comprising the columns 3 and 3 and the connecting rod 6 connecting them, the strength of the portal structure is improved by providing the connecting rod 6 between the columns 2, 3, 3 and 2, so that the column 2 , 3, 3, 2 can be set wide, and the support work of the columns 2, 3, 3, 2 is facilitated. Further, the strength improvement by the portal structure allows the diameters of the columns 2 and 3 to be suppressed, and the concrete foundation 7 is also small. As described above, in both cases of new installation and existing installation, construction relating to the columns 2 and 3 can be simplified.

In addition, since the end 6A of the connecting rod 6 is provided with the rotation connecting mechanisms 12 and 13 for connecting the end 6A to the support columns 2 and 3 so as to be able to rotate in the front-rear direction and to be able to rotate in the up-and-down direction. Since the eaves 6 are pivotably connected in the front-rear direction and the up-down direction, the struts 2, 3 and the connection eaves 6 absorb the shocks such as falling rocks or avalanches applied to the protective fence 1 at the connecting portions of the support posts 2, 3 damage can be suppressed.

Further, the connecting rod 6 is a filled steel pipe filled with a non-shrink mortar 11 as a filling material, and the rotation connecting mechanisms 12 and 13 have a connecting outer cylinder portion 15 for inserting and connecting the end portion 6A of the six connecting rods. Therefore, by using a filled steel pipe for the connecting rod 6, excellent deformation performance can be obtained, the shock absorbing capacity can be improved, and the rotary connecting mechanisms 12, 13 have a connecting outer cylinder portion 15. The cylindrical portion 15 is connected to the support columns 2 and 3 so as to be rotatable, and the end of the connecting rod 6 is inserted into the connecting outer cylindrical portion 15 to be connected, or the end of the connecting rod 6 is connected to the connecting outer cylindrical portion 18. The connecting outer cylinder portion 15 may be connected to the columns 2 and 3 after the insertion and arrangement, and the connecting operation of the connecting rod 6 to the columns 2 and 3 can be easily performed.

The columns 2 and 3 are filled steel pipes filled with non-shrink mortar 11 as a filler mixed with cement inside a circular steel pipe 110 having a circular cross section. A reinforcing body 8 having a triangular cross section is inscribed inside the steel pipe 110. The two vertices of the reinforcing body 8 are arranged on the tensile region side of the steel pipe 110, and a plurality of longitudinal reinforcing bars 10 are provided inside the steel pipe 110, and the plurality of reinforcing bars 10 are arranged in the tensile region of the steel pipe 110. Since the reinforcing body 8 in the steel pipe 110 constrains the cement mixture in the cross section, the compressive stress is improved, and there is a rib 111 that connects the two vertices of the reinforcing body 8 on the tensile region side. This improves the tensile stress on the tensile region side against the tensile force generated by bending, and can effectively improve the stress with respect to the load. In addition, the reinforcing bar 10 provided on the tensile region side inside the steel pipe 110 improves the tensile stress on the tensile region side against the tensile force generated by bending, and can improve the stress against the load. The rebar 10 is provided in close contact with the cement mixed material, which is cheaper than the steel material to which prestress is introduced, and is cost-effective.

Further, as an effect of the embodiment, the pipe struts 2 and 3 are reinforced by the reinforcing bodies 8 and the reinforcing bars 10 provided in the portions to be built in the ground, and the mortar is provided inside the pipe struts 2 and 3. By filling 11, the rigidity and strength of the pipe struts 2 and 3 are also improved. In addition, the triangular reinforcing body 8 provided in each pipe support 2 and 3 is built on the foundation 7 such as concrete because one side surface thereof is parallel to the direction in which the pipe support 2 and 3 rows are arranged. When an impact such as falling rocks or avalanches is applied to the protective wall 1, the bending stress and the shearing stress of each pipe support 2 and 3 can be increased. As a result, the rigidity and strength of the pipe struts 2 and 3 are further improved. At the same time, the connection strength of the pipe struts 2 and 3 is improved by connecting the upper ends of the pipe struts 2 and 3 with the connecting rod 6. Moreover, the inside of the connecting rod 6 for connecting the pipe struts 2 and 3 to each other is also filled with the mortar 11, and even if an impact is applied to the protective wall 1, it will not be easily bent. Further, the pipe struts 2 and 3 and the connecting rod 6 connecting them are connected by the rotating connecting mechanisms 12 and 13, so that the pipe struts 2 and 3 and the connecting rod 6 are rigid by welding or the like. Therefore, it is possible to absorb the impact received by the protective wall 1 by the rotary connecting mechanisms 12 and 13 of the pipe struts 2 and 3 and the connecting rod 6.

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, as the opening / closing means, various types such as a lid can be used other than the bolts shown in the embodiments. In addition, various types of shock absorbers can be used as long as they are slidably gripped. In addition to mortar, various types of fillers can be used, but it is preferable to use cement-based fillers by mixing cement such as mortar and concrete.

It is drawing of the engaging part which shows the Example of this invention, FIG. 1 (A) is a side view, FIG.1 (B) is a top view. It is a front view of an engaging part same as the above. It is a front view of a protection fence same as the above. It is a top view same as the above. It is a side view same as the above. It is a side view of the principal part of a terminal support | pillar same as the above. It is a side view of the principal part of an intermediate | middle support | pillar same as the above. It is sectional drawing of a terminal support | pillar same as the above. It is a front view of the principal part of a protection fence same as the above. It is a top view of the principal part of a protection fence same as the above. It is drawing of the principal part of a shock absorber same as the above, FIG. 11 (A) is a front view, FIG. 11 (B) is a side view. It is sectional drawing of the principal part of a shock absorber same as the above. It is drawing of a dispersion | distribution maintenance apparatus same as the above, FIG. 13 (A) is a side view, FIG.13 (B) is a front view. It is sectional drawing of the principal part of a dispersion | distribution maintenance apparatus same as the above. FIG. 15A is a side view and FIG. 15B is a plan view showing the outer ring of the dispersion maintaining device. FIG. 16A is a side view, and FIG. 16B is a plan view, showing the connection plate of the dispersion maintaining device.

1 Guard fence 2 Terminal pipe support (terminal support)
3 Intermediate pipe support (intermediate support)
4 Rope material 5 Wire mesh
23 Shock absorber
71 Engagement part
72 Engagement member
72G outer peripheral surface
73 Insertion receiving part
76 Bolt (Opening / closing member)

Claims (2)

Struts are erected at intervals, a rope member is erected between the struts in the vertical direction, and the middle of the rope member is engaged with an engaging portion provided on the strut, and both ends of the rope member In the protective fence in which the side is slidably gripped by a shock absorber and the shock absorbers on both ends are attached to the support column ,
The engaging portion includes an upper and lower engaging member, an insertion receiving portion formed by these upper and lower engaging members and capable of inserting the rope material from a length crossing direction, and an opening / closing means for opening and closing the insertion receiving portion. Prepared ,
The insertion receiving portion side of the upper and lower engaging members is formed in a curved shape, and a notch step is formed at the upper end of the upper engaging member and the lower end of the lower engaging member. Protective fence. Struts are erected at intervals, a rope member is erected between the struts in the vertical direction, and the middle of the rope member is engaged with an engaging portion provided on the strut, and both ends of the rope member In the construction method of the protective fence that slidably grips the side with the shock absorber provided on the column,
After gripping both ends of the rope material with the shock absorber, the shock absorber is provided on the column, and the middle of the rope material is inserted into the engagement portion from the length crossing direction, and the tip of the upper engagement member A method for constructing a protective fence, wherein a bolt is inserted into a hole in a notch step provided at the lower end of the upper and lower engaging members to engage the rope member .

Images