JP5005659B2 - Rock fall protection net structure - Google Patents

Description

The present invention relates to a rock fall protection structure on a slope where there is a risk of rock fall on a house or road.

When a rock fall occurs on a slope such as a slope, the rock falls while jumping off the slope, hits houses and roads below, and causes serious damage to the human body and transportation.
As countermeasures against this, many rockfall protection methods have been developed and installed in the past, and a typical example is the pocket-type rock net method that uses a wire mesh to guide the falling rocks while rolling down the slope to stop them. Are known.

In this pocket-type lock net construction method, the support columns fixed with suspension ropes and support side ropes are installed on the slopes at short intervals, for example, at intervals of 3 m in order to provide a mouth for receiving the falling rocks. Rock rocks collided with the rope, and the struts were bent or the suspension rope was broken.

  As measures against this, increase the interval between the columns, avoid the installation of columns in the swarms where there is a lot of falling rocks, and install columns with a span length of 12 to 30m on both sides of the slope. Supporting and fixing to the slope with, etc., hanging the protection net on the left and right columns, and connecting the rope and the protection net on the left and right columns with the rope, the collapse phenomenon of the falling rock protection net device due to insufficient strength of the protection net Proposals have been made to stop.

However, this method reduces the impact of falling rocks directly on the strut and the phenomenon of collapse, but if the falling rock hits the wire mesh, there is a risk that the reinforcement will be insufficient and the wire mesh will break through. However, there was a risk that the falling rock fell between the rope and the protection net that spanned the support and jumped over the receiving port, so the reliability and reliability of rockfall protection were not sufficient.
Japanese Patent No. 3874769

The present invention was devised in order to solve the above-mentioned problems, and the object of the present invention is excellent in terms of strength, function and construction, and even if a support is installed on a slope with a long span, the slope An object of the present invention is to provide a highly reliable large-span rockfall protection structure that can reliably protect rockfalls that roll while falling.

In order to achieve the above-mentioned object, the present invention comprises a pair of support columns erected so as to be able to tilt in the vertical direction in the width direction of the slope, and auxiliary support columns attached so as to protrude in a branch shape from the valley side of the support columns, A hook-shaped wire mesh attached to the main rope stretched between the tops of the pair of support posts and a horizontal main rope stretched between the tops of the auxiliary support posts, and both ends in the width direction are sloped with ropes. It features a fixed pocket wire mesh. (Claim 1)

According to the present invention, a pair of struts are erected so as to be able to tilt up and down in the width direction of the slope, and auxiliary struts are provided so as to project in a branch shape on the valley side of the struts, and between the tops of the pair of struts Since the main rope is stretched and the hook-shaped wire mesh is suspended from the main rope, the collision energy is attenuated by the jumping fallen rock colliding with the hook-shaped wire mesh, and is guided downward by the pocket-shaped wire mesh. Moreover, since the hook-shaped wire mesh is above the pocket-shaped wire mesh, it is possible to prevent the falling rocks from passing through and jumping over.
In addition, the upper edge of the pocket-shaped wire mesh is attached to the horizontal main rope stretched between the tops of the auxiliary struts that protrude forward from the struts, making it possible to enlarge the pocket mouth and effect the falling rocks Since the pocket-shaped wire mesh is fixed to the slope with a rope, it is possible to effectively guide the stone that jumps downward.

  In addition, since the rockfall intake port becomes larger as described above, the support column can be reduced in size, which can greatly reduce the work of installing the support column on the slope and reduce the size of the protective net. Construction is easy. In addition, most rockfalls first hit the hook-shaped wire mesh directly, and the decayed rockfall energy is guided to the pocket-shaped wire mesh, so that the pocket-shaped wire mesh is less damaged, and the repair is mainly limited to the repair of the hook-shaped wire mesh. Maintenance is also easy and inexpensive.

Preferably, the column head and the auxiliary column head are connected by a stay.
According to this, when an excessive load is applied to the pocket-shaped wire mesh, the force applied to the auxiliary column is distributed to the column by the stay, which is safe.
Preferably, the auxiliary column attached to the column has a hinge structure.
According to this, when a load is applied to the horizontal main rope, the stress applied to the connection part can be dispersed following the bending stress applied to the connection part of the support column and the auxiliary support column, and the impact energy of the falling rock is attenuated, coupled with the stay. Auxiliary struts can be prevented from being destroyed. The stay is preferably a rope because it can absorb the impact energy by stretching when an impact load is applied.

Further, the main rope stretched between the tops of the columns and the horizontal main rope stretched between the tops of the auxiliary columns are connected by a plurality of connecting ropes.
According to this, since the collision load applied to the main rope is transmitted to the horizontal main rope by the connecting rope, the load on the main rope is alleviated. Moreover, since the impact load applied to the horizontal main rope is similarly transmitted to the main rope, the load on the horizontal main rope is reduced.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows an embodiment of a large-scale falling rock protection net structure according to the present invention. Reference numeral 1 denotes a protection net according to the present invention. Reference numerals 2 and 2 are a pair of struts in the width direction of the slope (left and right direction). The slope is a relatively good location with a small percentage of falling rocks, with an interval of approximately 30m across the swept portion a with a high frequency of falling rocks. Is erected.

As shown in FIG. 3, the pair of columns 2 and 2 are erected in such a manner that they can be tilted in the vertical direction by hinged lower ends to the bracket-attached plate 21 fixed on the concrete foundation 24 with cement anchor bolts, respectively. It is fixed with a column suspension rope 81 anchored to the mountain side slope and a side rope 91 anchored to the slope in the span direction (width direction) with an arbitrary angle such as perpendicular to the slope set.

Reference numeral 4 denotes a main rope stretched between the tops of the pair of struts 2, 2. The main rope 4 is fixed to the slopes by anchors 80, 80 via guide grooves 95 provided at the top of the struts. ing. The main rope 4 has a wire mesh having a width across the entire area between the support columns 2 and 2, the upper edge portion of which is attached by a coupling coil 43 and is suspended in a hook shape. As shown in FIG. 4, a plurality of reinforcing ropes 42 are arranged vertically and horizontally on the saddle-shaped wire mesh 41, and are attached by a coupling coil 43 as shown in FIG. It is combined with.

The auxiliary struts 3 are hinged to the pair of struts 2 and 2 so as to be tiltable in the vertical direction at positions facing the valley side above the intermediate portion. A horizontal main rope 6 is stretched between the tops of the pair of auxiliary struts 3, 3, and the horizontal main rope 6 has anchors 80, 80 at both ends thereof on the slopes via guide grooves 95 at the top of the auxiliary struts. It is fixed with.
An upper edge portion of a wire mesh 51 having a width across the entire area between the auxiliary columns 3 and 3 is attached to the horizontal main rope 6, and the wire mesh 51 is suspended so as to form a pocket shape as shown in FIG. As shown in FIG. 1, a plurality of reinforcing ropes 52 are arranged vertically and horizontally in the pocket-shaped wire mesh 51 and connected to the wire mesh by a coupling coil 43, and the crossing portions of the vertical and horizontal ropes 52 are joined by cross clips.

Further, in order to guide the falling rock smoothly downward, the lateral auxiliary ropes 10 are arranged at several places of the pocket-shaped wire mesh 51 and are connected to the wire mesh by the coupling coil 43, and both end portions of the lateral auxiliary rope 10. Are fixed to the slopes on both sides in the width direction by anchors 90 such as cement jaw anchors. The cement jaw anchor has a U-shaped upper end of a bolt-shaped body as shown in FIG. Further, the lower edge of the wire net 51 is closely attached to the slope on the valley side by a pin anchor (not shown) so that the falling rocks do not flow out.

As shown in FIG. 3, the support column 2 is provided with two left and right brackets 23, 23 in the span width direction on the head, and the support column 2 is provided with stays 91, 91, for example, ropes through the brackets 23, 23 in the slope span width direction. Anchored to For example, a cement jaw anchor bolt 90 as shown in FIG. 9 is used as an anchor, and a rope as a stay is connected to the anchor via a shackle, and tension is adjusted by a turnbuckle 86 or the like.

  Further, brackets 24 and 24 are provided on the mountain side and valley side on the head of the column 2, and the column 2 is fixed to the upper side of the mountain side slope with an anchor 80 with a hanging rope 81 through the mountain side bracket 24. For example, the anchor bolt shown in FIG. 8 is used as the anchor, and a connecting hardware 85 made of a plate with a bracket or the like is fixed to the upper end of the anchor, and the end of the suspension rope is connected to the shaft passed to the pair of brackets. The tension of the suspension rope 81 is adjusted by a turnbuckle 86 or the like.

As described above, the guide groove 95 for guiding the main rope 4 in the span width direction is provided at the top of the support column 2. The main rope 4 is stretched over the pair of struts 2 and 2 so as to pass through the guide groove 95, and the upper portion of the guide groove is prevented from coming off by, for example, a bolt nut 96 so that the main rope 4 can slide without coming off the guide groove 95. Has been.
Both ends of the main ropes 4 and 4 are fixed with anchors 80. For example, the anchor bolt shown in FIG. 8 is used as the anchor, and a connecting metal piece 85 made of a plate with a pair of brackets is fixed to the upper end of the anchor bolt, and the end of the main rope 4 is connected to the shaft passed to the pair of brackets. Is adjusted by a turnbuckle 86 or the like.

Next, the auxiliary column 3 will be described. The auxiliary column 3 is attached to the valley side of the column 2 as shown in FIG. A hinge bracket 29 is attached to the middle portion of the support column 2, and the rear end of the auxiliary support column 3 is fitted into the groove 291 of the bracket 29, and the support shaft 292 is inserted therethrough to be optimal for the inclination of the construction method surface. It is connected so that it can be tilted up and down so as to project forward at an angle.
Further, a bracket 34 is attached to the head of the auxiliary column 3 on the mountain side, and the head bracket 24 of the column 2 and the auxiliary column head bracket 34 are connected by a stay 22 such as a rope. Rope is suitable because it can absorb impact energy by stretching when impact load is applied.

The left and right brackets 33 and 33 are attached to the head of the auxiliary column 3 in the span width direction, and the auxiliary column 3 is anchored in the span width direction by a stay 91 such as a rope via the brackets 33 and 33. For example, a cement jaw anchor bolt 90 shown in FIG. 9 is used as the anchor, and the anchor is connected to the ground. The tension of the stay is adjusted by a turnbuckle 86.

A guide groove 95 that guides the horizontal main rope 6 in the span width direction is provided at the top of the auxiliary strut 3, and the horizontal main rope 6 is passed through the guide grooves 95 of the pair of auxiliary struts 3 and 3, The upper portion of the slide groove 95 is prevented from coming off by, for example, a bolt nut 96 so that the horizontal main rope 6 can slide without coming off the guide groove 95. As shown in FIG. 8, both ends of the horizontal main rope 6 are fixed to a connecting hardware 85 fixed to the anchor 80, and the tension of the horizontal main rope 6 is adjusted by a turnbuckle 86.

As described above, according to the present invention, a wire mesh is suspended in a hook shape on the main rope 4 as shown in FIGS. The main rope 4 is, for example, a 7 × 7 structure galvanized rope having a diameter of 24 mm, and the hooked wire mesh 41 is, for example, a knitted wire of 5 mm diameter knitted into a 50 mm × 50 mm rhombus, for example, a diameter. 14 mm reinforcing ropes 42 are arranged at intervals of 5 m in the vertical and horizontal directions, and are connected and fixed to the wire mesh by a coupling coil 43, and the intersections of the vertical and horizontal reinforcing ropes 42 are coupled by a coupling metal fitting such as a cross clip (not shown). . The wire mesh, reinforcement rope, cross clip, etc. are galvanized for corrosion protection, but are preferably resin-coated for landscape maintenance.
As shown in FIG. 5, the hooked wire mesh 41 is attached to the main rope 4 so that the upper edge of the hooked wire mesh 41 is wrapped from the valley side to the mountain side and bent, and the main rope 4 and the wire mesh are sewn. The hooked wire mesh 41 is hung in a hook shape between the support spans.

Next, the pocket-shaped wire net 51 suspended from the horizontal main rope 6 will be described. The horizontal main rope 6 is, for example, a galvanized rope having a structure of 7 × 7 and a diameter of 24 mm. For example, a wire knitted with a diameter of 4 mm is used as the pocket-shaped wire mesh 51. For example, reinforcing ropes 52 having a 3 × 7 structure and a diameter of 12 mm are arranged at intervals of 3 m vertically and horizontally, and attached to the wire mesh with a coupling coil 43. It is. Since the attachment of the pocket-shaped wire mesh 51 to the horizontal main rope 6 is the same as the attachment to the main rope 4, it is omitted.

Next, the horizontal auxiliary rope 10 will be described. The horizontal auxiliary rope 10 is arranged on the pocket-shaped wire mesh 51 at intervals of 5 m in the vertical direction, and is attached to the wire mesh with a coupling coil 43. Both ends are coupled to an anchor provided on a slope, for example, a cement jaw anchor of FIG. 9 via a shackle and a turnbuckle 86, so that the span width direction of the wire mesh is laid so as to contact the slope, and falling rocks are efficiently removed. The tension of the lateral auxiliary rope is adjusted by a turnbuckle 86 so that it can be guided downward.

The horizontal auxiliary rope 10 at the lowermost end of the pocket-shaped wire mesh 51 is anchored along the slope so that falling rocks do not slip through the pocket-shaped wire mesh 51, but there is a gap between the wire mesh and the slope. A pin anchor (not shown) can be driven along the inclined surface so as to be in close contact with the inclined surface.
Moreover, although the metal mesh, the reinforcing rope, the cross clip, etc. are galvanized for corrosion prevention, it is desirable that they are coated with resin for maintaining the scenery.

As shown in FIG. 1, the main rope 4 stretched on the support columns 2, 2 and the horizontal main rope 6 stretched on the auxiliary support columns 3, 3 are connected by a vertical connection rope 7 between the spans. It is desirable to connect at least 3 locations and at most 9 locations. If the amount is too small, the effect of connection is lost. If the amount is too large, falling rocks directly hit the connecting rope, which may hinder guidance of falling rocks.
FIG. 6 shows the coupling of the main rope 4 and the connecting rope 7. Two metal plate-shaped connecting fittings 70 having a concave groove 72 and a coupling hole 73 through which the bolt passes are provided in the concave groove 72. In the same way, the annular portion 74 at one end of the connecting rope whose ends are processed into an annular shape is sandwiched, and bolts are inserted into the coupling hole 73 and the annular portion of the connecting rope, and fixed to the main rope 4 with nuts. . Since the connection between the horizontal main rope 6 and the connecting rope 7 is the same as the connection with the main rope 4, the description thereof is omitted.

  According to the falling rock protection net of the present invention, the pair of left and right support columns 2 and 2 are erected at a right angle with or close to the inclined surface by the suspension rope 81 and the side ropes 91 and 91, and assist the front side of the support columns 2 and 2. Struts 3 and 3 are attached and protruded forward from the slopes 2 and 2, and a pocket wire mesh 51 is attached to the horizontal main rope 6 stretched between the tops of the auxiliary struts 3 and 3 so that a rockfall intake port is enlarged. Therefore, it is possible to effectively receive and guide the falling rocks to the pocket wire mesh 51. Further, since the pocket-shaped wire net 51 is fixed to the slope with a horizontal rope, it is possible to effectively guide the stone that jumps downward. In addition, since the rockfall intake port becomes large, the columns 2 and 2 can be reduced in size, and the work of building the columns on the slope can be greatly reduced.

Since the hooked wire mesh 41 is suspended in the vertical direction on the main rope 4 stretched between the tops of the pair of columns 2 and 2 erected in the width direction of the slope, the hooked wire mesh is collided with the falling rock fall The collision energy is attenuated by the bending of, and is guided downward by the pocket metal mesh. Further, since the bowl-shaped wire mesh 41 is located above the pocket-shaped wire mesh 51, it is possible to prevent the falling rocks from passing through and jumping over.
Furthermore, since rock fall energy is absorbed by the bending of the hook-shaped wire mesh 41 directly colliding with the fall rock, the fall rock does not break the pocket wire mesh 51 and jump out of the protective net.

Since the main rope 4 stretched between the tops of the columns 2 and 2 and the horizontal main rope 6 stretched between the tops of the auxiliary columns 3 and 3 are connected by the vertical rope 7, it is added to the main rope 4. The impact load is transmitted to the horizontal main rope 6 by the connected rope 7, and the impact load applied to the horizontal main rope 6 is similarly transmitted to the main rope 4, and the load on each rope is relaxed. Since the impact load is distributed, the safety of the rock fall protection net is improved.

Therefore, by these synergistic effects, it is possible to reduce the size compared to the conventional protection net, to facilitate the construction, to stabilize the quality and to improve the reliability. Further, most of the falling rocks directly hit the hanging wire mesh 41, and the fallen rock energy is guided to the pocket wire mesh 51, so that the damage of the pocket wire mesh 51 is reduced, and the repair is mainly performed. Since repair of the hook-shaped wire net 41 is sufficient, the maintenance can be performed easily and inexpensively compared to the replacement of the conventional protective net.

Further, since the column head and the auxiliary column head are connected by the stay 22, when an excessive load is applied to the pocket-shaped wire mesh 51, the force applied to the auxiliary column 3, 3 is distributed to the columns 2, 2 by the stay. And can prevent damage.
Further, since the auxiliary struts 3 and 3 attached to the struts 2 and 2 have a hinge structure, when a load is applied to the horizontal main rope 6, the bending applied to the connecting portion between the struts 2 and 2 and the auxiliary struts 3 and 3 It is possible to disperse the stress applied to the connecting portion following the stress, and it is possible to prevent the auxiliary struts 3 and 3 from being broken by the impact energy of falling rocks in combination with the stay. The stay is preferably a rope.

FIG. 10 shows another embodiment of the present invention. A rockfall protection net having one span between the support columns 2 and 2 of the present invention is arranged on the slope facing the road from the left, the first span 101 and the second span 102. A plurality of the third spans 103 are continuously installed.
The first span 101 is installed according to the first embodiment, and the second span 102 is similarly installed according to the first embodiment, with the column 2 on the right side of the first span 101 as the column 2 on the left side of the span. The third and subsequent spans are installed in the same manner.
According to the present invention, since the struts 2 of adjacent spans are used as one strut, it is not necessary to erect a pair of two struts for each span. Therefore, it is effective to apply to places where rock falls continuously over a wide area, and the number of support columns is greatly reduced, and the construction cost including material costs can be greatly reduced.

It is a partial notch front view which shows one Example of the rock fall protection net structure by this invention. It is a side view which shows one Example of the rock fall protection net structure by this invention. (A) is an enlarged front view of the support | pillar and auxiliary support | pillar of FIG. 1, (b) is a side view. It is sectional drawing which follows the XX line of FIG. (A) is a front view which shows the connection part of a main rope and a horizontal main rope with a rope, (b) is a side view. (A) is a front view which shows the coupling | bonding state of a rope and a wire mesh, (b) is a side view. It is a top view which shows the top part of a support | pillar and an auxiliary | assistant support | pillar. It is a side view which shows an example of an anchor metal fitting. It is a front view which shows an example of an anchor. It is a front view which shows another Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Falling rock protection net a Slope 2 Strut 22 Stay 3 Auxiliary strut 4 Main rope 41 Cascade wire net 51 Pocket metal net 6 Horizontal main rope 7 Connecting rope

Claims (4)

A pair of struts erected so as to be able to tilt in the vertical direction in the width direction of the slope, auxiliary struts attached to project from the valley side of the struts in a branch shape, and stretched between the tops of the pair of struts A saddle-shaped wire mesh attached to the main rope and a pocket-like wire mesh attached to a horizontal main rope stretched between the tops of the auxiliary struts and fixed to the slope with ropes at both ends in the width direction. A unique rockfall protection net structure. The falling rock protection net structure according to claim 1, wherein the column head and the auxiliary column head are connected by a stay. The falling rock protection net structure according to claim 1 or 2, wherein the auxiliary support attached to the support is a hinge structure. The rock fall protection net structure according to any one of claims 1 to 3, wherein a main rope stretched between the tops of the columns and a horizontal main rope stretched between the tops of the auxiliary columns are connected by a plurality of connecting ropes.

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