JP2008019673A - Falling-rock protective fence and falling-rock protective net - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a falling-rock protective fence and a falling-rock protective net which are safe and low in labor consumption to improve construction efficiency, is highly resistant against rusting and corrosion to substantially reduce life cycle costs, and enables the recycling of a net. <P>SOLUTION: A plurality of posts 2 are vertically installed at the foot of a slope 1 that is close to a road, etc. , and has a risk of a falling rock S. A plurality of nets 4 made of polyester monofilaments are stacked via a plurality of horizontal reinforcements 3 disposed between the posts 2, and stretched into a wall-shaped structure to construct the falling-rock protective fence. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rockfall protection fence and a rockfall protection net, and more particularly, to a structure of a rockfall protection fence and a rockfall protection net that is suitable for construction on a slope or the like that is prone to rockfall in the vicinity of a road or the like.

  Conventionally, various slope stabilization methods have been adopted in order to prevent the surface soil on the cut slope from flowing out due to natural phenomena such as rain, or the slope from collapsing due to falling rocks or avalanches. In particular, a means for protecting by receiving a fallen rock or an avalanche by attaching a protective fence or a protective net by a hanging rope or the like to a slope where there is a risk of falling rocks near a road or the like is generally taken.

  Conventional rockfall protection nets are roughly classified into a fence type, a pocket type and a cover type. An overturning rockfall protection net is built in a large area of wire mesh with a number of vertical ropes and multiple horizontal ropes spaced apart from each other, with the ends of each vertical rope and horizontal rope anchored to the slope. By laying the wire mesh so as to fit the slope, it is a structure that supports rocks and prevents rocks and falling rocks. On the other hand, the pocket-type rockfall protection net is built with a large number of pocket-forming struts on both sides of the swaths at intervals of 3 to 4 meters so that it can be tilted in the vertical direction. A plurality of horizontal ropes that are connected and drooped and supported at both ends by anchors are arranged on the slope at regular vertical intervals, a wire mesh is stretched over the vertical and horizontal ropes as a protective net, and buffered by a suspension rope The upper part of the protective mesh is suspended at the height of the support with the supported support, and a wire mesh with a rope is suspended in a curtain shape by each support, forming a pocket that opens to the full width of the wire mesh with the rope, falling rocks, etc. It has a structure that absorbs and absorbs rockfall energy.

  For example, in Patent Document 1, left and right vertical ropes, upper end horizontal ropes, and a plurality of lower half horizontal ropes are incorporated and reinforced together with a number of vertical and horizontal reinforcing ropes, and both side slopes such as swaths are provided. The left and right struts are hinged to the anchors installed on the anchors so that the ridges can be tilted in the vertical direction, and the ends of the hanging ropes and side ropes anchored to the slopes on both sides are connected to the top of each strut. The upper end of the left and right vertical ropes are connected to the upper part of each support, and the upper end lateral rope anchored at both ends to the slopes on both sides is slidably supported on the upper part of each support, Each end of the rope is anchored to the slopes on both sides, and the upper half of the wire mesh is configured as a pocket that absorbs and absorbs rockfall energy, and the lower half of the wire mesh is laid on the ground, such as a swath, to make a rockfall Construct and construct in the laying part that catches Method of rockfall protection net you as have been described.

Japanese Patent No. 2916633

  However, in general, the protective net is made of metal and has a heavy weight. It is dangerous and work is very difficult to carry and stretch the protective net to the slope, and the workability is poor. Moreover, although galvanization is performed and durability is improved, it is weak against rust and corrosion, and renewal is frequently required in coastal areas, volcanic areas, and industrial areas, increasing the life cycle cost.

  In order to solve the above-mentioned problems, the first feature of the falling rock protection fence and falling rock protection net of the present invention is that a plurality of nets are laminated. Further, the second feature is that the net body is divided into layers. Furthermore, the third feature is that the edge portions of the mesh are connected to each other.

Furthermore, the network used in the present invention is a synthetic resin network having a polygonal network made of a polyester monofilament having the following characteristics and woven without welding or adhesion to the twisted portion. It is preferable.
Intrinsic viscosity = 0.6 or more Wire diameter = 1.5 to 4.5 mm Strength elongation product = 750 to 3000 kg / mm ² % Abrasion durability = 5000 times / mm ² or more.

  According to the present invention, not only is it safe and labor can be reduced and workability is improved, but also the life cycle cost can be greatly reduced because it is resistant to rust and corrosion. In addition, the net itself can be recycled.

  Hereinafter, embodiments of a rock fall protection fence and a rock fall protection net according to the present invention will be described based on the drawings. FIG. 1 is a side view schematically showing the structure of a rockfall protection fence according to the present invention, FIG. 2 is a side view schematically showing the structure of a pocket type rockfall protection net according to the present invention, and FIG. 3 is a cover according to the present invention. FIG. 4 and FIG. 5 are main part front views schematically showing a method of connecting the nets, schematically showing the structure of the rockfall protection net.

  In the figure, reference numeral 1 denotes, for example, a slope where there is a risk of falling rock S near a road or the like. A plurality of struts 2 are suspended from the ridges of the slope 1, and a plurality of nets 4 made of polyester monofilament are laminated through a plurality of horizontal bars 3 laid between the struts 2, A rock fall protection fence is constructed by stretching the wall.

  As shown in FIGS. 2 and 3, a suspension rope that protrudes from the slope 1 and is attached in the width direction of the slope 1 between a plurality of poles 5 fixedly supported by the traction rope 6 and the anchor 7. In the pocket type rock fall protection net and the cover type rock fall protection net, in which the net body 4 is stretched in a curtain shape, it is possible to increase the strength by changing the number of layers of the net body 4 where rock fall S and the like are likely to concentrate. It is. In other words, the net body 4 is laminated and constructed in a paragraph shape. Here, the term “paragraph” refers to a method in which a plurality of nets 4 are stacked to have different lengths and the strength is changed stepwise.

  In addition, the connection of the net bodies 4 is connected by abutting the edge portions of the net bodies 4 together. That is, as shown in FIG. 4 or 5, the connecting portion is made movable or fixed so as to be sewn using the coil wire 9 or the steel wire 10. As a result, the material can be reduced by 10% to 20% by the overlapping amount of the mesh body 4 that has been overlapped and connected in the past, and the mesh body 4 can be saved.

Here, it is desirable that the mesh body 4 is a synthetic resin mesh body having a polygonal mesh formed of a polyester monofilament having the following characteristics as a raw material and woven without welding or adhesion to the twisted portion.
Intrinsic viscosity = 0.6 or more Wire diameter = 1.5 to 4.5 mm Strength elongation product = 750 to 3000 kg / mm ² % Abrasion durability = 5000 times / mm ² or more.

It is a side view which shows typically the structure of the rock fall protection fence which concerns on this invention. It is a side view which shows typically the structure of the pocket type rock fall protection net | network concerning this invention. It is a side view which shows typically the structure of the cover type rock fall protection net | network concerning this invention. It is a principal part front view which shows the connection method of a net body typically. It is a principal part front view which shows the connection method of a net body typically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Slope 2 Strut 3 Transverse 4 Net 5 Pole 6 Tow rope 7 Anchor 8 Suspension rope 9 Coil wire 10 Steel wire S Falling stone

Claims (4)

A rock fall protection fence and a rock fall protection net characterized by laminating a plurality of nets made of polyester monofilament. The rock fall protection fence and the rock fall protection net according to claim 1, wherein the net body is laminated in a paragraph shape. The falling rock protection fence and falling rock protection net according to claim 1 or 2, wherein the edge portions of the mesh body are butted and connected to each other. The net body is a synthetic resin net body having a polygonal mesh made of a polyester monofilament having the following characteristics and woven without welding or adhesion to a twisted portion. The rock fall protection fence and the rock fall protection net according to claim 3.
Intrinsic viscosity = 0.6 or more Wire diameter = 1.5 to 4.5 mm Strength elongation product = 750 to 3000 kg / mm ² % Abrasion durability = 5000 times / mm ² or more.

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