JP6644975B2 - Protective fence - Google Patents

Description

  The present invention relates to a protective fence for protecting a road along a mountain from falling rocks, avalanches, and the like.

  Heretofore, as this type, in a shock absorbing fence composed of a plurality of horizontal rope members laid horizontally between columns erected at intervals, two main shock absorbing devices attached to the columns have been used. The main shock absorber and the sub shock absorber are gripped by the sub shock absorber between the main shock absorber and the end stopper attached to the extra length of the horizontal rope material while gripping the middle of the rope material. Is gripped with a clamping force that allows sliding with the horizontal rope material when a tension less than the tensile strength of the rope material is applied, and when the end stopper contacts the sub shock absorber and the main shock absorber, the horizontal rope material is There is an impact absorbing fence (for example, Patent Document 1) configured to be able to transmit a tension and a bending force of a column to each other.

  The above-mentioned shock absorbing fence has a structure that absorbs the impact force such as falling rocks mainly by the horizontal rope material provided with the shock absorbing device, so a large number of horizontal rope materials and the shock absorbing device are required, so the number of parts increases In addition, there is a problem that the management of the gripping force by the shock absorbing device becomes complicated.

  Therefore, as a thing which reduced the horizontal rope material and the shock absorbing device, the concrete foundation installed on the mountain side slope of the mountainous area, the plurality of columns erected on the upper surface of the concrete foundation, and the space between the plurality of columns were provided. A wire mesh stretched and stretched, a pair of wire ropes, a pair of cross wires, and a columnar spacing member having upper and lower ends connected to the pair of wire ropes together with the wire mesh and arranged at predetermined intervals between the columns. There is a protective fence provided with a buffer at both ends of the wire rope and a loop-shaped buffer at both ends of each of the cross wires (for example, Patent Document 2).

JP-A-54316 JP 2012-225036 A

  The above-mentioned protective fence has a simple configuration, a large buffer effect, and a greater impact energy absorption.

  By the way, in the above-mentioned shock absorbing fence and protective fence, if the expected impact force such as falling rocks is relatively small, even if the size of the horizontal rope material or the performance of the shock absorbing device is reduced as it is, the number of horizontal rope materials and Because the number does not decrease significantly, it is difficult to adapt to sites where the impact force is relatively small.

  Further, in the above-mentioned protective fence, since the impact force is dispersed and absorbed by the entire horizontal rope material provided in the multi-stage by providing the spacing material, the number of members is increased by the spacing material, and the spacing material is increased. In some cases, the effect of absorbing the impact force due to the deformation of the wire mesh due to the cross rope and the cross rope is low.

  Furthermore, when connecting the ends of multiple rope materials, such as horizontal rope materials and cross ropes, to the pillars, if the mounting parts are close to each other, the connecting work of those rope materials becomes complicated, and the attachment of each rope material When the part is separated, a gap is created between the rope material and the net, complicating the connection work between the rope and the net, and the impact force applied to the net, albeit slightly, is applied to the rope. Since it takes time to be transmitted, there is a concern that the shock absorbing effect due to the integrated behavior of the net and the rope material may be reduced.

  Then, in view of the above-mentioned problems, an object of the present invention is to provide a protective fence capable of improving the shock absorbing effect of a net with a simple configuration.

  Means for Solving the Problems To achieve the above object, the invention according to claim 1 is a protection fence in which columns are erected at intervals in an installation place, and a protection surface is provided between the columns, wherein the protection surface has a plurality of protection surfaces. A mesh provided between the columns, an upper horizontal rope material provided between upper portions of the plurality of columns, a lower horizontal rope material provided between lower portions of the plurality of columns, and a pair arranged to intersect between the columns. And a lower part of the column is fixed to the installation location, and reinforcing materials are provided on the left and right sides of the column at the ends.

The invention according to claim 2 is characterized in that the mesh is a diamond-shaped wire mesh in which the tensile strength of a steel wire constituting the mesh is 880 N / mm ² or more.

The invention according to claim 1 is characterized in that a vertical rope material is provided at a front portion of the post at the end portion, an edge of the net body is connected to the vertical rope material, and an oblique portion is provided at a front portion of the post at the end portion. A front-facing oblique rope material attachment portion is provided, and the end of the oblique rope material is connected to the oblique rope material attachment portion.

The invention according to claim 3, the upper engaging portion provided above the middle of the strut, together with the upper horizontal provided halfway inserted insertion receiving portion of the rope materials on top of the upper engaging portion, said upper engagement At the lower part of the joining part, an insertion receiving part for inserting one half of a pair of oblique rope members is provided, and a lower engaging part is provided at a lower part of the intermediate support, and the lower engaging part is provided at a lower part of the lower engaging part. An insertion receiver is provided for inserting the middle of the horizontal rope material, and an insertion receiver for inserting the other of the pair of oblique rope materials is provided above the lower engagement portion.

The invention according to claim 4 is characterized in that the insertion receiving portion below the upper engagement portion is provided with a hanging portion for hanging the middle of the oblique rope material, and the tubular body is loosely fitted to the hanging portion. The insertion receiving portion on the upper part of the lower engaging portion is provided with a hanging portion for hanging the middle of the oblique rope material, and a tubular body is loosely fitted to the hanging portion.

  According to the configuration of the first aspect, when an impact force is applied to the front surface of the protection surface due to a falling rock or the like, the net body, the upper and lower horizontal rope materials, and the oblique rope material are deformed to absorb the impact force. At this time, the strut at the end is subjected to a force to fall to the left and right center side in addition to the rear side, but the bending strength is improved by the reinforcing material provided on the left and right inside the strut, and the protective surface with a net body Can improve the effect of absorbing the impact force.

  According to the configuration of the second aspect, the impact force absorbing effect can be improved by the deformation of the net, and the number of shock absorbers is reduced or becomes unnecessary depending on the use conditions, and the workability at the site is improved. , Maintenance is easy.

Further, according to the configuration of claim 1, linked to a front of the column the edge of the mesh member by the vertical rope materials, by providing the oblique rope materials mounting portion obliquely forward strut, the diagonal ropes material netting Can be integrated at a position along or close to the rear surface, and the applied impact force is simultaneously transmitted to the oblique rope material, and the rope material is deformed together with the net body to absorb the impact force.

According to the configuration of claim 3, the workability of attaching the rope material during construction is improved, and when an impact force is applied to the protective surface and a tension is applied to the rope material, each rope material is placed in a separate insertion receiving portion. Because of the passage, the rope members can be prevented from interfering with each other.

According to the configuration of claim 4, since the portion where the oblique rope material is bent is the outer surface of the cylindrical body and the cylindrical body turns, the tensile force is applied to the entire length of the oblique rope material without applying excessive force to the bent portion. Is added, and the impact force can be absorbed.

1 is an overall front view showing a first embodiment of the present invention. FIG. 2A is a side view of the column, FIG. 2A is a middle column, FIG. 2B is a column at both ends, and FIG. 2C is a column at the end. It is a side view of the principal part of a support same as the above. It is a top view of the principal part of a support same as the above. It is sectional drawing of a support | pillar of an end part same as the above. It is sectional drawing of the support | pillar of both ends same as the above. It is sectional drawing of an intermediate support | pillar same as the above. It is an enlarged side view of the upper part of an intermediate pillar same as the above. FIG. 9A is a front view of an engaging portion of an intermediate column, and FIG. 9A illustrates an upper engaging portion, and FIG. 9A illustrates an upper engaging portion. It is a top view of a buffer metal same as the above. It is a front view of a buffer metal same as the above. It is a side view of a holding body same as the above. It is a side view of a buffer metal same as the above. It is a side view of a support | pillar upper part same as the above. FIG. It is a front view of a support | pillar upper part same as the above. It is a front view of a support | pillar upper part same as the above. It is a front view of a net same as the above. It is a front view of the principal part of a net same as the above. FIG. 6 is an overall front view showing a second embodiment of the present invention. It is sectional drawing of a same chord material. It is a front view around the same chord material. It is a front view of the upper part of a support | pillar which shows Example 3 of this invention. It is a front view of a support | pillar upper part same as the above.

  Preferred embodiments of the present invention will be described 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 indispensable requirements of the present invention.

  1 to 19 show a first embodiment of the present invention. As shown in FIG. 1, the protective fence 1 is provided on a mountain-side slope such as a road or a railroad in a mountainous area which is a sloping land, and is installed along a danger point to prevent landslides, falling rocks, avalanches, and the like. You.

  The protective fence 1 is erected on the slope 2 which is an installation place on the mountain side, and in this example, is erected substantially vertically (FIG. 15). The protective fence 1 is composed of, for example, four columns 3, 3A, 3A, 3B and a protective surface 4 provided between the columns 3, 3A, 3A, 3B. The four pillars 3, 3A, 3A, 3B are erected at equal intervals in the left-right direction, and about three-thirds of the length of the pillars 3, 3A, 3A, 3B are underground. It is located, and about two-thirds of the pillars are vertically erected from the ground surface.

  The support 3 is an end support provided at an end of the protective fence 1, and the support 3 at this end has the support 3A on only one of the left and right sides, and does not have the support 3A, 3A on both sides. The support 3B is a support at both ends provided at a predetermined interval between the supports 3,3. The column 3A is an intermediate column provided between the columns 3 and 3B or between the columns 3B and 3B. In this example, two columns 3A and 3A are provided between the column 3 and the column 3B. The protection surfaces 4 are provided at equal intervals and provided as a set of four columns 3, 3A, 3A, 3B. Note that columns 3A, 3A, 3B or columns 3A, 3A, 3 (not shown) are arranged on the right side of the column 3B on the right side in FIG.

  The protective surface 4 includes a rhombus-shaped wire mesh 5 serving as a net, upper and lower horizontal rope members 6 and 7, one oblique rope material 8, and the other oblique rope material 8 intersecting the one oblique rope material 8. And an oblique rope material 9. Each of the rope members 6, 7, 8, 9 is made of a wire rope or the like.

  The columns 3, 3A, 3B are made of steel pipes having the same diameter, thickness and length. As shown in FIGS. 3, 5 and 6, the horizontal rope material mounting portions 11, 11 </ b> A made of horizontal metal flat plates are provided on the upper side and the lower side at the front side (mountain side) of the vertical columns 3, 3 </ b> B. And mounting holes 13 for mounting buffer members 51, 51 are formed on the left and right sides of these mounting portions 11, 11A.

  The upper mounting portion 11 is connected to a buffer metal fitting 51 provided at the end of the upper horizontal rope material 6, and the lower mounting portion 11A is provided with a buffer metal fitting provided at the terminal of the lower horizontal rope material 7. 51 is attached. Further, the lower mounting portion 11A is disposed on the ground in proximity to the slope 2 as an installation location.

  The vertical rope material mounting portion 16 is located below the horizontal rope material mounting portion 11 above the columns 3, 3B, and the vertical rope material mounting portion 16 is positioned below the horizontal rope members 3 and 3B. Is located above the horizontal rope material mounting portion 11A.

  At the front upper center and lower side of the pillars 3 and 3B, there are provided vertical rope material attachment portions 16 and 16 for vertically connecting the vertical rope material 81, and the attachment portion 16 is a vertical metal plate. The piece is fixed to the front center of the pillars 3 and 3B by welding or the like, and a mounting hole 17 for connecting a vertical rope material 81 is formed in the mounting portion 16 thereof.

  At the upper side and the lower side of the front side of the pillars 3 and 3B, mounting portions 21 and 21 for diagonal rope materials are provided on the left and right. The left and right mounting portions 21 and 21 are arranged so that a vertical metal plate piece projects obliquely to the left and right front sides, and the horizontal rope material mounting portions 11 and 11A are arranged in the front and rear direction (the mountain side and the opposite mountain side). The left and right mounting portions 21 and 21 are disposed so that the right and left angle θ with respect to the vertical rope material mounting portion 16 is directed to a direction of 75 degrees or less while being protruded at the front center in the direction of (a). Mounting holes 22 for connecting the ends of the oblique rope members 8 and 9 are formed in the left and right mounting portions 21 and 21, respectively. In this example, the angle θ is about 45 to 75 degrees, and in the drawing, the angle θ is 60 degrees. When the angle θ exceeds 75 degrees, the mounting hole 22 separates from the rear surface of the diamond-shaped wire mesh 5, and the angle θ is less than 45 degrees, close to the other mounting portions 16, and the oblique rope members 8, 9, etc. Since the mounting may be complicated, the above range is set.

  By thus arranging the oblique rope material attachment portions 21 and 21 obliquely left and right toward the front side, the attachment holes 22 can be arranged at positions near the front portions of the columns 3 and 3B. Therefore, the oblique rope members 8 and 9 can be arranged at a position close to the diamond-shaped wire mesh 5 provided on the front side (mountain side) of the protective fence 1 or at a position along the rear surface of the diamond-shaped wire mesh 5. This facilitates the work of connecting the diagonal rope members 8, 9 and the diamond-shaped wire mesh 5 by the coupling coil 82, which will be described later, and integrates the diagonal rope materials 8, 9 and the diamond-shaped wire mesh 5. Can be.

  The end portions of the oblique rope members 8 and 9 are provided between the mounting hole 13 of the upper horizontal rope material mounting portion 11 and the mounting hole 17 of the upper mounting portion 16 of the vertical rope material 81 adjacent below the mounting portion. An upper mounting hole 22 for connecting the lower horizontal rope material mounting portion 11A with the mounting hole 13 on the lower side of the vertical rope material 81 which is close to the upper mounting hole 11 is provided. A lower mounting hole 22 connecting the ends of the slanted rope members 8 and 9 is located therebetween.

  Next, the upper and lower engaging portions 31 and 31A of the intermediate support 3A, which is one of the features of the present invention, will be described in detail. As shown in FIGS. 1, 8 and 9, the upper and lower engaging portions 31, 31A are provided on the upper side and the lower side on the front side of the support 3A. The upper and lower engaging portions 31 and 31A are provided on the front side (mountain side) of the column 3 with upper, middle, and lower engaging members 32, 32, 32 projecting forward, and these engaging members 32, 32 are provided. , 32 are made of a round bar or the like having a circular cross section. The round bar is made of steel or the like and is welded to the outer periphery of the column 3A.

  In the upper engaging portion 31, an insertion receiving portion 33 is formed between the upper and middle engaging members 32, 32 so that the middle of the upper horizontal rope material 6 can be inserted from the side. An insertion receiving portion 33 is formed between the engaging members 32, 32 so as to be able to insert one side of the oblique rope members 8, 9 from the side. In the lower engaging portion 31A, an insertion receiving portion 33 is formed between the lower engaging member 32 and the lower engaging member 32 so that the lower horizontal rope member 7 can be inserted from the side in the middle. Between the engaging members 32, 32, there is formed an insertion receiving portion 33 capable of inserting the other part of the oblique rope members 8, 9 from the side.

  The column portions 32K, 32K of the engaging members 32, 32 are located on the insertion receiving portion 33 side. In addition, notch steps 34, 34 are formed at the upper end of the upper and middle engaging members 32, 32, and notch steps 34A are formed at the lower end of the lower engaging member 32. At the positions corresponding to the notch step portions 34, 34, 34A, through holes 35, 35, 35 are formed in the engaging members 32, 32, 32, and bolts 36 serving as opening / closing means are inserted from above through the through holes 35, 35, 35. By inserting the nuts 37 and 37A into the bolts 36 and screwing the nuts 37 and 37A into the bolts 36, the insertion receiving portions 33 and 33 can be closed. Conversely, the nuts 37 and 37A are removed and the bolt 36 is removed. Thereby, the insertion receiving portions 33, 33 can be opened.

  In the upper engaging portion 31, one of the oblique rope members 8 and 9 is inserted into the lower insertion receiving portion 33, and the oblique rope members 8 and 9 are hung on the cylindrical portion 32K of the lower engaging member 32. The other changes direction. In the lower engaging portion 31A, the other half of the oblique rope members 8 and 9 is inserted into the upper insertion receiving portion 33, and is hung on the columnar portion 32K of the upper engaging member 32 to be inserted into the oblique rope member. The other of 8, 9 changes direction.

  In the upper and lower engaging portions 31, 31A, the cylindrical body 38 is loosely fitted to the cylindrical portions 32K, 32K on which the oblique rope members 8, 9 are mounted, whereby the cylindrical body 38 can be rotated on the cylindrical portion 32K. It is provided outside. The cylindrical body 38 is formed of a plated steel pipe like the column, and the inner diameter of the cylindrical body 38 is larger than the outer diameter of the cylindrical portion 32K. The cylindrical portion 32K provided with the cylindrical body 38 and below the upper engaging portion 31 and the cylindrical portion 32K provided with the cylindrical body 38 and above the lower engaging portion 31A are hook portions. In consideration of durability, a stainless steel tube can be used for the cylindrical body 38.

  Therefore, the oblique rope members 8 and 9 inserted into the insertion receiving portion 33 below the upper engaging portion 31 are bent along the outer surface of the cylindrical body 38, and the insertion receiving portion above the lower engaging portion 31A. The oblique rope members 8 and 9 inserted into 33 are bent along the outer surface of the cylindrical body 38, and in this state, the oblique rope members 8 and 9 are stretched between the columns 3 and 3B. Therefore, when the oblique rope members 8 and 9 slide along the length direction, the sliding is smoothly performed without resistance due to the rotation of the cylindrical body 38.

  Next, the reinforcing members 41, 41A, 41A of the columns 3, 3A, 3B will be described. As shown in FIG. 2 and FIGS. 5 to 7, the reinforcing members 41, 41A, 41A provided in the columns 3, 3A, 3B are installed at positions close to and below the lower horizontal rope material attaching portion 11A. A reinforcing member 42 and a spacer 43 are provided above and below the surface corresponding portion. The spacer 43 has a reinforcing plate 44 in the front-rear direction. The reinforcing plate 44 is made of a steel plate, and is provided over substantially the entire length of the reinforcing members 41, 41A, 41A. Positioning ribs 45, 45 for positioning the reinforcing member 42 on the inner surfaces of the columns 3, 3A, 3B at the front and rear sides of the columns 3, 3A, 3B are provided before and after the spacer 43. In FIG. 2, the slope 2 as an installation surface is located between the upper end 41J and the lower end 41K of the reinforcing members 41, 41A.

  The positioning rib 45 is formed of an arc-shaped steel plate obtained by reducing the diameter of the column 3, 3A, 3B having a circular cross section, and the length of the column 3, 3A, 3B in the longitudinal direction is set to the reinforcing members 41, 41A, It is formed short with respect to the entire length of 41A, and is provided so as to be line-symmetric with respect to a virtual horizontal line X shown on the central axis of the columns 3, 3A, 3B.

  The reinforcing plate 44 connecting the positioning ribs 45, 45 has a thickness of 9 mm, which is half or more of the thickness of the supporting columns 3, 3A, 3B of 11 mm. The reinforcing member 42 positioned by the spacer 43 is made of a standardized reinforcing bar such as a deformed steel bar. In the present embodiment, the reinforcing member 42 is provided on the compression region side and the tension region side before and after the columns 3, 3A and 3B. Four reinforcing members 42 are provided and reinforced. Then, the reinforcing bodies 41, 41A, 41A including the reinforcing members 42 are mounted in the columns 3, 3A, 3B and integrated. As will be described later, the pillar 3 at the end has reinforcing members 42 disposed on the left and right inside.

  The spacer 43 is provided by connecting a plurality of positioning ribs 45, 45 arranged at predetermined intervals in the longitudinal direction of the reinforcing member 42 with one reinforcing plate 44. The reinforcing member 42 is welded to the positioning rib 45 as necessary, and is integrated with the positioning rib 45 and the reinforcing plate 44 to form the reinforcing members 41, 41A, 41A. Then, the reinforcing members 41, 41A, 41A are inserted and arranged from the end openings of the columns 3, 3A, 3B. The length of the positioning ribs 45 is 50 mm, and the positioning ribs 45, 45 adjacent to each other in the column length direction are arranged at intervals of about 2 m.

  Further, the inside of the columns 3, 3A, 3B is filled with an indefinite hardening material 46 such as non-shrink mortar to form a load-bearing material.

  As shown in FIG. 5, the reinforcing member 41 provided on the column 3 at the end has the following configuration which is not provided in the reinforcing member 41A of the other columns 3A and 3B. In the reinforcing member 41, the left and right reinforcing plates 44A, 44A are integrally provided at the center of the reinforcing plate 44 in the front-rear direction with the spacer 43, whereby the reinforcing plates 44, 44A, 44A form a substantially cross shape. Arc-shaped positioning ribs 45A, 45A are provided at the ends of the reinforcing plates 44A, 44A, and the two reinforcing members 42, 42 are arranged between the left and right positioning ribs 45A, 45A and the inner surface of the column 3. I have. The thickness of the reinforcing plate 44A is the same as that of the reinforcing plate 44. The reinforcing plate 44A has the same configuration as the reinforcing plate 44.

  Therefore, the column 3 at the end not only responds to the force for tilting the column 3 in the front-rear direction but also to the force for tilting the column 3 in the left-right direction. Since the reinforcing members 42 are located, the cross-sectional performance can be improved with respect to the force in the left-right direction. Specifically, on the protective surface 4 provided with the rhombus-shaped wire mesh 5, the upper and lower horizontal rope members 6, 7 and the diagonal rope members 8, 9, the support columns 3 have a strength against a load applied from each member. Thus, the impact absorbing effect of each member can be improved.

  As shown in FIG. 2, on the outer periphery of each of the columns 3, 3A, 3B, a rotation stopping member 48, 48, 48 in the column length direction is fixed to the column underground. The rotation stopping members 48 are made of steel round bars or the like, and are provided at equal intervals in the circumferential direction on the front side and the left and right diagonally rear sides (FIG. 5). Further, the rotation stopping member 48 is provided in the underground portion of the columns 3, 3A, 3B.

  Therefore, the columns 3, 3A, 3B laid down during fabrication at the factory by the rotation stopping member 48 do not rotate carelessly, and the workability is excellent. Further, in the construction, the columns 3, 3A, 3B are inserted into the excavation hole 95, and the non-shrink mortar, which is a hardening material, is filled in the excavation hole 95, and the mortar hardened by the rotation stopper 48 and the columns 3, 3A, 3B can be integrated.

  One upper horizontal rope material 6 and one lower horizontal rope material 7 are installed between the upper and lower portions of the columns 3, 3A, 3A, 3B while maintaining a predetermined tension. For this reason, buffer members 51 are connected to the upper and lower mounting portions 11, 11A of the columns 3, 3B, and the buffer members 51 grip the middle of the ends of the horizontal rope members 6, 7.

  The upper and lower horizontal rope members 6, 7 are swingably connected to the columns 3, 3B by the buffer metal fittings 51. As shown in FIGS. 10 to 13, the buffer metal fitting 51 includes a pair of grippers 52, 52 for gripping the horizontal rope members 6, 7 with a predetermined frictional force. Then, a fitting groove 52A to be fitted to the horizontal rope members 6, 7 is formed, and the both gripping bodies 52, 52 are tightened and fixed by tightening means 53 such as a bolt nut. On the side surfaces of the gripping bodies 52, 52 fixed to each other, engagement grooves 55, 55 with which U bolts 54 are engaged are formed, and both ends 54T, 54T of the U bolt 54 are formed in the engagement grooves 55, 55. Engage. Further, a plate 56 is provided as an insertion portion for inserting both end portions 54T, 54T of the U bolt 54, and a groove portion 57 for loosely inserting the horizontal rope members 6, 7 is formed in the plate 56.

  Then, the U bolt 54 is connected to the mounting holes 13 of the mounting portions 11 and 11A by the shackle 65, and the upper and lower horizontal rope members 6 and 7 are clamped between both ends 54T and 54T of the U bolt 54. , 52 are fitted, and the ends 54T, 54T are inserted through the plate 56, and a nut 58 is screwed into the ends 54T, 54T. Further, stoppers 59 are provided at the ends of the horizontal rope members 6 and 7 to be engaged with the grippers 52 and 52, respectively.

  A pair of oblique rope members 8 and 9 are arranged to intersect between the columns 3, 3A, 3A and 3B, and one of the oblique rope members 8 connected to the upper side of the column 3 at the end is connected to the other end of the column. From the upper side of the column 3, it is inserted into the lower insertion receiving portion 33 of the adjacent column 3 </ b> A, further inserted into the upper insertion receiving portion 33 of the next column 3 </ b> A, and further above the next column 3 </ b> B. It is connected. Further, the other oblique rope material 9 connected to the lower side of the column 3 at the end is connected from the lower side of the column 3 at the end to the upper insertion receiving portion 33 of the adjacent column 3A, and further connected to the adjacent column 3A. Is connected to the lower insertion receiving portion 33 of the column 3A, and is further connected to the upper side of the column 3B adjacent to the column 3A.

  As shown in FIGS. 1, 16 and 17, a loop-type shock absorber 61 is provided at an end of each of the oblique rope members 8 and 9. This loop-type shock absorber 61 has a loop portion 62 made of a rope material constituting a part of the diagonal rope materials 8 and 9, and a tension is applied to the diagonal rope materials 8 and 9 at the intersection of the loop portions 62. And a buffer metal fitting 63 that provides a certain sliding resistance. Loop portions 64, 64 are provided at both ends of the loop portion 62, and end portions 8T, 9T of the oblique rope members 8, 9 are connected to the loop portion 64 on the center side (opposite to the support column) of the loop portion 62. .

  Then, the loop portion 64 on the distal end side (post side) of the loop portion 62 is connected to the mounting hole 22 on the upper portion of the posts 3 and 3B by a shackle 65 as a metal fitting. On the other hand, the distal end side of a turnbuckle 66, which is tension adjusting means, is connected to the lower mounting hole 22 of the pillars 3 and 3B by a shackle 65, and the loop portion on the distal end side (strut side) of the loop portion 62 is connected to the turnbuckle 66. 64 are connected. In this way, a pair of oblique rope members 8, 9 are stretched in an X shape between the columns 3, 3A, 3A, 3B.

  A plurality of sliding members 67 and a stopper 68 for stopping sliding of the rope member of the loop portion 62 are provided at the center of the loop portion 62. The sliding body 67 has a constant diameter of the loop portions 62 so that the tension is applied to the oblique rope members 8 and 9, the diameter of the loop portions 62 is reduced and stress concentration occurs, and the oblique rope members 8 and 9 are not broken. It has a function to keep the following.

  When the oblique rope members 8 and 9 are stretched, the loop portion 62 is located below the oblique rope members 8 and 9 by its own weight. Therefore, as shown in FIG. The upper loop portion 62 is arranged on the center side, and the lower loop portion 62 is configured not to touch the installation surface such as the slope 2. In this example, the lower loop portion 62 is located on the center side by the amount of the turnbuckle 66.

A galvanized steel wire 71 is used for the rhombus-shaped wire mesh 5, and as shown in FIG. 18, a vertical steel wire 71 is bent at about 85 degrees from one side to the right and the other to the left and right from top to bottom. The bent portions 72, 72 are formed, and the bent portions 72, 72 of the adjacent steel wires 71, 71 are engaged with each other to form an engaging portion 73. A rhombus or a square having four oblique sides formed of the steel wires 71. Are formed. The steel wire 71 preferably has a tensile strength TS of 880 N / mm ² or more. The tensile strength is the maximum tensile stress that appears in the material before breaking, and is based on JIS Z 2241. The galvanized steel wire 71 is based on JIS G 3548.

  Further, as an example, the rhombic wire mesh 5 has a steel wire 71 having a diameter of 3.2 mm, a mesh 74 having a size of 50 mm × 50 mm (for a design load of 100 kJ), a steel wire 71 having a diameter of 4.0 mm, and a mesh 74 having a diameter of 4.0 mm. A steel wire having a size of 50 mm × 50 mm (for a design load of 300 kJ), a diameter of the steel wire 71 of 4.0 mm, and a mesh 74 having a size of 40 mm × 40 mm (for a design load of 500 kJ) is used. The fact that the size of the mesh 74 is 50 mm × 50 mm indicates the interval K between the parallel steel wires 71 constituting the mesh 74 and the interval between the remaining steel wires 71.

  As shown in FIG. 19, the upper and lower edges of the rhombus-shaped wire netting 5 are arranged so that at least one of a pair of left and right steel wires 71, 71 in the engaging portion 73, in this example, both of them are on the steel wires 71, 71 side. A bent complete knuckle processing portion 75 is formed. Also, as shown in FIG. 18, a plurality of bent portions 72, 72... Are formed on one end of a left-right width direction edge 5 </ b> F of the diamond-shaped wire netting 5 by one steel wire 71 in the vertical direction. ing. In the case where the distance between the columns 3 and 3B is wide, a plurality of rhombus-shaped wire nets 5 and 5 in which the edges 5F are integrally connected is used. Incidentally, the edge 5F of the diamond-shaped wire mesh 5 may be one in which the complete knuckle-processed portions 75, 75...

  In the column 3 at the end, the edge 5F of the diamond-shaped wire mesh 5 is connected to the column 3 by a vertical rope material 81 and a coupling coil 82. As shown in FIGS. 14 to 17, the vertical rope member 81 is provided with thimble loops 83, 83 (FIG. 15) at both ends, and these loops 83, 83 are connected by a turnbuckle 84. The vertical rope material 81 is formed in a ring shape, and folded portions 81K, 81K are provided on the upper and lower sides, and thimbles 85, 85 are provided in the upper and lower folded portions 81K, 81K. Has a front and rear rope material front portion 81F and a rope material rear portion 81R.

  The upper and lower thimbles 85, 85 are connected to the upper and lower mounting holes 17, 17 by the shackles 65, 65, respectively. The turnbuckle 84 is arranged at the rear part 81R of the rope material, and connects the edge 5F of the diamond-shaped wire netting 5 to the front part 81F of the rope material by a plurality of coupling coils 82. In this case, the coupling coil 82 is provided so as to be wound around the vertical rope material 81 and the mesh 74 at the edge 5F of the rhombus-shaped wire mesh 5.

  In the column 3B located between the left and right columns 3A, 3A, the vertical rope material 81 is connected to the upper and lower mounting holes 17, 17 similarly to the column 3, and the edges 5F, 5F, 5F is connected to the rope material front portion 81F by a plurality of coupling coils 82.

  The upper and lower horizontal rope members 6 and 7 are connected to the diamond-shaped wire mesh 5 by a plurality of coupling coils 82 while being attached to the rear surface of the diamond-shaped wire mesh 5. The oblique rope members 8 and 9 are connected to the diamond-shaped wire mesh 5 by a plurality of coupling coils 82 while being attached to the rear surface of the diamond-shaped wire mesh 5. In addition, the mesh 74 at the center in the vertical direction from the mesh 74 provided with the complete knuckle processing portion 75 of the diamond-shaped wire mesh 5 and the upper and lower horizontal rope members 6 and 7 are connected by the coupling coil 82, that is, upper and lower. A mesh 74 provided with at least the complete knuckle processing portion 75 is located outside the horizontal rope members 6 and 7 in the vertical direction.

  A cap 91 is fixed to the upper portions of the columns 3, 3A and 3B, and a through hole 92 is formed in the center of the cap 91. A steel material (not shown) having a female screw portion 94 (FIGS. 3 and 8) is provided on the upper surfaces of the columns 3, 3A and 3B, and a bolt 93 is inserted through the through hole 92. The cap 91 is fixed to the columns 3, 3A, 3B by being screwed into the female screw portion 94.

  Then, in a construction site such as a mountainous area, a drilling hole 95 having a predetermined depth is formed by a drilling means such as a down-the-hole, and the posts 3, 3A, and 3B are inserted into the drilling hole 95, and a hardening Is filled.

  Next, the upper and lower horizontal rope members 6, 7 and the oblique rope members 8, 9 are erected on the mountain sides of the columns 3, 3A, 3A, 3B so as to connect the columns 3, 3A, 3A, 3B. Then, a rhombus-shaped wire mesh 5 is stretched across the front side of the rope members 6, 7, 8, 9 at the front side of the posts 3, 3A, 3A, 3B, and the rope members 6, 7, 8, 9 and the rhombus shape. The wire mesh 5 is connected with the connection coil 82. In this case, since the oblique rope members 8 and 9 are located close to the rear surface of the rhombus-shaped wire mesh 5 by the obliquely forward attaching portion 21, the joining operation is facilitated by the coupling coil 82. The edges 5F, 5F of the diamond-shaped wire net 5 are connected to the columns 3, 3B via the vertical rope material 81.

  Next, the operation of the protective fence 1 will be described. When falling rocks or earth and sand collide with the protective fence 1, the kinetic energy at the time of the collision causes the rhombic wire mesh 5, the upper and lower horizontal rope materials 6, 7 and the diagonal rope materials 8, 9 to be deformed to the valley side and elongated. In this case, only the upper and lower horizontal rope members 6 and 7 and the diagonal rope members 8 and 9 are located behind the diamond-shaped wire mesh 5, and there is no member or the like for maintaining the vertical spacing of the diamond-shaped wire mesh 5, so that the diamond-shaped wire mesh 5 is not provided. The wire mesh 5 can be greatly deformed, and by using the steel wire 71 having a large deformation amount and a high tensile strength as described above, a higher impact force absorbing effect as compared with the conventional one using the mesh body and its mounting structure. Is obtained.

  Further, since the upper and lower horizontal rope materials 6, 7 and the oblique rope materials 8, 9 are erected on the valley side of the diamond-shaped wire mesh 5, an impact force is applied through the diamond-shaped wire mesh 5, and the upper and lower horizontal rope materials are applied. The tension is applied to the rope members 6 and 7 and the oblique rope members 8 and 9.

  In this case, the oblique rope members 8 and 9 are also arranged at positions near the rear surface of the diamond-shaped wire net 5 by the oblique rope material mounting portion 21 facing obliquely forward. A force is applied to the oblique rope members 8 and 9, and the oblique rope members 8 and 9 deform together with the diamond-shaped wire netting 5 to absorb the impact force.

  Further, when a predetermined or more tensile force is applied to the upper and lower horizontal rope members 6, 7, the horizontal rope members 6, 7 slide against the buffering members 51, 51, and thus the protective fence 1 is caused by an avalanche or a falling rock. When a tensile force is applied to the upper and lower horizontal rope members 6 in response to the above, the upper and lower horizontal rope members 6 and 7 slide against the buffer metal fitting 51, thereby absorbing the impact force instead of frictional energy. can do. Further, when a predetermined tensile force or more is applied to the slanted rope members 8 and 9, the slanted rope members 8 and 9 slide with respect to the buffer member 63 and extend so that the loop portion 62 becomes small. When the loop portion 62 slides, the impact force can be absorbed instead of the friction energy.

  Then, the rhombus-shaped wire mesh 5, the upper and lower horizontal rope members 6, 7 and the oblique rope members 8, 9 are elastically deformed and expanded by an impact force, and in some cases, are expanded to a plastic deformation region. Absorbs impact energy. At this time, a force is applied to the end support 3 by the protective surface 4 so as to fall inward in the left-right direction of the protective fence 1, and the reinforcing members 42 are located on the left and right sides, which are the tension region and the compression region in this case. The cross-sectional performance can be improved with respect to the force in the left-right direction. Therefore, it is possible to secure the effect of absorbing the shock due to the deformation of the protection surface 4 mainly composed of the rhombic wire net 5.

  As described above, in the present embodiment, the columns 3, 3A, 3B are erected at intervals on the slope 2 as the installation location, and the protective surface 4 is provided between the columns 3, 3A, 3B. In the protective fence 1 provided with the support, the protective surface 4 includes a rhombus-shaped wire mesh 5 serving as a net body provided between the plurality of columns 3, 3A, 3B and an upper side provided between upper portions of the plurality of columns 3, 3A, 3B. A rope member 6, a lower horizontal rope member 7 provided between lower portions of the plurality of columns 3, 3A, 3B, and a pair of diagonal rope members 8, 9 arranged crossing the columns 3, 3A, 3B. Since the lower portions of the columns 3, 3A, 3B are fixed to the slope 2 and the reinforcing members 42, 42 are provided on the left and right sides of the column 3 at the end, when the impact force is applied to the front surface of the protection surface 4 by falling rocks or the like. The impact force is absorbed by the deformation of the rhombus-shaped wire mesh 5, the upper and lower horizontal rope members 6, 7 and the oblique rope members 8, 9. At this time, a force that tries to fall to the left and right central sides besides the rear side is applied to the end pillar 3, but the bending strength is improved by the reinforcing members 42 provided on the left and right inside the pillar 3, and the rhombic shape is obtained. The effect of absorbing the impact force of the protective surface 4 provided with the wire mesh 5 can be improved.

As described above, in the present embodiment, the mesh is a diamond-shaped wire mesh 5 in which the tensile strength of the steel wire 71 constituting the mesh is 880 N / mm ² or more. The impact force absorbing effect can be improved by the deformation of 5, and the number of the buffer metal fittings 51 and the buffer devices 61, which are the buffer devices, is reduced or becomes unnecessary depending on the use conditions, and the workability at the site is improved, Maintenance is easy.

Further, in the present embodiment thus, corresponding to claim 1, the vertical rope material 81 provided at the front of the column 3 of the end portion, the edges of the mesh member serving rhombus wire net 5 in the vertical rope materials 81 5F, and a diagonally forward-facing oblique rope material attachment portion 21 was provided at the front of the end support 3, and the oblique rope material 8 and 9 were connected to the oblique rope material attachment portion 21. The oblique rope members 8, 9 can be arranged along or close to the rear surface of the diamond-shaped wire mesh 5 to achieve integration, and the applied impact force is simultaneously transmitted to the oblique rope materials 8, 9 and together with the diamond-shaped wire mesh 5, The oblique rope members 8 and 9 can be deformed to absorb the impact force. In addition, as an effect of the embodiment, when the coupling coil 82 as the coupling means is used, since the rhombus-shaped wire mesh 5 and the oblique rope members 8 and 9 are close to each other, the operation of coupling the both becomes easy.

Thus, in this embodiment, corresponding to claim 3, the upper engaging portion 31 provided in the upper portion of the intermediate strut 3A, inserting the middle of upper transverse rope member 6 on top of the upper engaging portion 31 An insertion receiving portion 33 is provided, and an insertion receiving portion 33 is provided below the upper engaging portion 31 so as to pass through one of the pair of oblique rope members 8 and 9, and a lower engaging portion is provided at a lower portion of the intermediate support 3 </ b> A. A lower portion 31A is provided, and an insertion receiving portion 33 is provided below the lower engaging portion 31A so as to pass through the middle of the lower horizontal rope member 7; 9 is provided, the workability of attaching the rope members 6, 7, 8, 9 is improved during construction, and an impact force is applied to the protective surface 4, so that the rope members 6, 7, 8 When tension is applied to each of the rope materials 6, 7, 8, 9 Because it is passed through the insertion receiving portion 33, 33, it is possible to prevent the each other rope materials 6, 7, 8 and 9 do not interfere.

Thus, in this embodiment, corresponding to claim 4, the lower portion of the insertion receiving portion 33 of the upper engaging portion 31 is hung section serving cylindrical portion 32K which hung in the middle of a diagonal rope materials 8,9 A cylindrical body 38 serving as a cylindrical body is rotatably mounted on the cylindrical portion 32K, and a hook is provided on the insertion receiving portion 33 above the lower engaging portion 31A so that the oblique rope members 8 and 9 are mounted halfway. Since a cylindrical portion 32K as a mounting portion is provided, and a cylindrical body 38 as a cylindrical body is rotatably mounted on the cylindrical portion 32K, a portion where the oblique rope members 8, 9 are bent is an outer surface of the cylindrical body 38, Since the 38 rotates, a tensile force is applied to the entire length of the slanted rope members 8 and 9 without applying an excessive force to the bent portion, and the impact force can be absorbed.

  Hereinafter, as an effect of the embodiment, on the upper side, the horizontal rope material mounting portion 11 from above the columns 3 and 3B, the diagonal rope material mounting portions 21 and 21 diagonally left and right outward below this, and the vertical rope below this. By arranging the material mounting portion 16, the plurality of rope materials 6, 7, 8, 9, 81 can be mounted without interference in a narrow range. In addition, the arrangement | positioning of the mounting parts 11,21,21,16 on the lower side of the support | pillars 3 and 3B is upside down from the upper side. In addition, since the reinforcing members 42, 42 and the positioning ribs 45A, 45A are provided on substantially the entire length of the reinforcing member 41 on the left and right sides of the column 3, the bending strength of the protective fence 1 inward in the left-right direction is effectively improved. be able to. Also, since a plurality of lengthwise rotation stoppers 48 are provided on the outer periphery of the posts 3, 3A, 3B at intervals in the circumferential direction, inadvertent rotation during manufacturing can be prevented and the drilling holes 95 can be erected. At this time, integration with the filler filled in the excavation hole 95 can be achieved. Further, since the upper edge and the lower edge of the diamond-shaped wire mesh 5 are provided with the complete knuckle processing portion 75, the diamond-shaped wire mesh 5 is excellent in strength. Further, the vertical rope material 81 connects the upper and lower folded portions 81K and 81K to the upper and lower ends of the support pillar 3 and has a rope material front portion 81F and a rope material rear portion 81R between the upper and lower folded portions 81K and 81K. Then, since the edge 5F of the diamond-shaped wire netting 5 serving as a net body is connected to the rope material front portion 81F, a turnbuckle 84 is provided at the rope material rear portion 81R of the loop-shaped vertical rope material 81 to attach the vertical rope material 81 to a predetermined position. The end 5F of the diamond-shaped wire mesh 5 can be connected to the rope material front portion 81F made of only the rope material by tension.

  20 to 22 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 will be omitted. In this example, the upper chord, which is a long metal material, is connected to the upper ends of the posts 3, 3A, 3A, 3B to connect the upper ends and maintain a constant interval between the posts 3, 3A, 3A, 3B. 101 is attached. The ends of the upper chord material 101 are rotatably connected to the caps 91 of the posts 3, 3A, 3A, 3B in the front-rear direction and the up-down direction by rotating connection portions 102, 102. Note that the upper chord material 101 is disposed above the upper horizontal rope material 6.

  A strut-side fixing member 103 is integrally provided at the lower front side of the upper chord material 101. The strut-side fixing member 103 is made of a steel flat bar or the like, and is obliquely forward and downward with respect to the center of the upper chord material 101. It is fixed and a plurality of through holes 104A are formed. Further, a mesh fixing member 104 sandwiching the rhombus-shaped wire netting 5 with the support-side fixing member 103 is provided. The mesh fixing member 104 has a through hole 104A corresponding to the through hole 103A. Have been. Note that the net fixing member 104 has substantially the same length in the left-right direction and a narrower vertical width as the support-side fixing member 103.

  Then, the rhombus-shaped wire mesh 5 is arranged on the front side of the upper chord material 101, the mesh fixing member 104 is overlapped from the front side, and the bolt 105 is inserted through the through holes 103A, 104A and the mesh 74 from the rear side. By screwing the nut 105 </ b> A, the rhombus wire mesh 5 can be fixed to the upper chord material 101.

  As described above, this embodiment is suitable for installation in an installation place where a heavy snow load is applied. That is, when there is no upper chord material 101, when a large snow load is applied, the protective surface 4 is bent downward due to the snow load, the rhombic wire net 5 is bent, or the rope materials 6 and 7 move with respect to the buffer metal fitting 51. There is a risk of sliding, and after melting the snow, the effect of absorbing the impact force such as falling rocks may be reduced as it is. However, by providing the upper chord material 101, the problem can be solved. The effect as an avalanche prevention fence is obtained by providing it in the avalanche.

  Further, there is no member for maintaining the vertical spacing of the diamond-shaped wire mesh 5, and only the upper edge side of the diamond-shaped wire mesh 5 is connected to the upper chord material 101 made of a hard material such as a steel pipe. The degree of freedom of deformation of the wire mesh 5 can be secured, and the impact force absorbing effect of the rhombic wire mesh 5 made of the steel wire 71 having high tensile strength can be secured.

  FIGS. 23 and 24 show a third embodiment of the present invention, in which the same parts as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted. The protective fence 1 of this example does not use the buffer metal fittings 51 and the loop type buffer device 61. Specifically, a loop 64 such as a thimble is provided at the end of the upper and lower horizontal rope members 6 and 7, and the loop 64 is connected to the mounting holes 17 and 17 by a shackle 65.

  On the side of the support 3, a loop 64 such as a thimble is provided at the end 8 T of the diagonal rope 8, and the loop 64 is connected to the mounting hole 22 on the upper side of the support 3 by a shackle 65, A ring portion 64 such as a thimble is provided at the end 9T of the support member 3, and the ring portion 64 is connected to the turnbuckle 66 connected to the mounting hole 22 on the lower side of the column 3.

  Further, although not shown, a ring portion 64 such as a thimble is provided at the end of the oblique rope material 9 on the column 3B side, and this ring portion 64 is connected to the mounting hole 22 on the upper side of the column 3B by a shackle 65. A loop 64 such as a thimble is provided at the end of the rope material 9, and the loop 64 is connected to the turnbuckle 66 connected to the lower mounting hole 22 of the support 3 </ b> B.

  As described above, in the present embodiment, in the protective fence 1 having a relatively small design load, the impact force such as falling rocks can be absorbed mainly by the deformation of the diamond-shaped wire mesh 5 composed of the steel wire 71 having high tensile strength, In addition, by eliminating the need for the buffer metal fittings 51 and the loop-type buffer device 61, it is possible to improve the workability and ensure the ease of maintenance.

  Note that the present invention is not limited to the present embodiment, and various modifications can be made within the scope of the present invention. For example, in the embodiment, the columns are provided in the vertical direction, but the columns may be provided perpendicular to the slope. In addition, a column may be erected on a concrete foundation. Further, the length and the number of the columns and the reinforcing members can be appropriately set. In addition, the spacing between the columns, the mesh size of the net, the external dimensions and the number of the nets are not particularly limited, and can be freely set in consideration of the topography of the construction site, the objects to be received (stone, earth and sand, snow), and the like. be able to. Further, as the net, a plain woven wire mesh, a crimp wire mesh, a turtle wire mesh, or the like can be used other than the rhombus wire mesh.

1 Protective fence 2 Slope (location)
3 props (posts at the end)
3A support (middle support)
3B support (support at both ends)
4 Protective surface 5 Diamond wire mesh (net)
5F Edge 6 Upper horizontal rope material 7 Lower horizontal rope material 8 One oblique rope material 9 The other oblique rope material 31 Upper engaging portion 31A Lower engaging portion 32K Column portion (hanging portion)
33 insertion receiving portion 38 cylindrical body (cylindrical body)
42 Reinforcement material 71 Steel wire 81 Vertical rope material 81K Folded part

Claims (4)

Standing columns are installed at intervals at the installation location, and in a protective fence with a protective surface between these columns,
The protective surface is a net provided between a plurality of columns, an upper horizontal rope material provided between upper portions of the plurality of columns, a lower horizontal rope material provided between lower portions of a plurality of columns, and between the columns. With a pair of diagonal rope materials arranged crossing,
The lower part of the support is fixed to the installation location, and reinforcing materials are provided on the left and right sides of the support at the ends ,
A vertical rope material is provided at a front portion of the end post, an edge of the net is connected to the vertical rope material, and an oblique rope material mounting portion is provided at a front portion of the end post at an oblique front direction. An end of the oblique rope material is connected to the attachment portion for the oblique rope material . ^2. The protective fence according to claim 1, wherein the net is a diamond-shaped wire net having a tensile strength of a steel wire constituting the net of 880 N / mm ² or more. The upper engaging portion provided above the middle of the strut, provided with a halfway inserted insertion receiving portion of the upper transverse rope materials on top of the upper engaging portion, a pair at the bottom of the upper engaging portion An insertion receiving portion is provided for inserting one halfway of the oblique rope material, a lower engaging portion is provided at a lower portion of the intermediate column, and a lower engaging portion is inserted at a lower portion of the lower engaging portion. insertion receiving portion provided with a claim 1 or 2 guard fence according to, characterized in that a insertion receiving portion for inserting the other of the oblique rope materials paired at the top of the lower-side engagement portion. In the insertion receiving portion below the upper engaging portion, a hook portion for hanging the middle of the oblique rope material is provided. 4. The protective fence according to claim 3, wherein the upper insertion receiving portion is provided with a hook portion for hanging the middle of the oblique rope material, and the tubular body is loosely fitted in the hook portion.

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