JP5479677B2 - Protective fence system for slopes - Google Patents

Description

  The present invention relates to a protective fence system used for slopes, and more particularly to a slope protective fence system for receiving the collapse of rocks or falling rocks and ensuring the safety of the area below the slope.

  Japan is a country with many natural disasters, and disasters caused by landslides and falling rocks on slopes are also frequent. Therefore, the residents who live in the vicinity of the slope are always faced with disasters, and it is extremely important to take protective measures against landslides and falling rocks on the slope.

  As such a protective measure on a slope, for example, a net is installed in the middle of the slope, and a protective fence is installed to catch earth and sand and falling rocks that have collapsed by the net. FIG. 10 shows an example of such a protective fence. As shown in the drawing, a plurality of support pillars 10 are erected on hinged portions at required positions of the natural ground 100, and an upper holding rope for holding the upper edge of the net 20 between the upper positions of the support pillars 10. I have twelve. Similarly, a lower holding rope 14 for holding the lower edge of the net 20 is bridged between the lower positions of the columns 10. A net 20 is installed between the upper and lower holding ropes 12 and 14.

  The respective struts 10 can be inclined to the valley side by the hinge portions, and the anchor ropes 24 for restricting the inclination within a predetermined range and the anchors 19 installed at predetermined positions on the mountain-side slope and the respective struts. The upper holding rope 12 is suspended separately from the upper end portion of 10. In addition, the end part holding rope 11 suspended between the support | pillar 10-1 located in the end of a support | pillar row | line | column and the ground on the mountain side is also comprised with the rope separate from the upper side holding rope 12, and is stretched separately. ing. Similarly, the end holding rope 11, which is separate from the upper holding rope 12, is stretched over the support 10-n positioned at the opposite end of the support column.

  A brake that absorbs shock by extending the ropes within a predetermined length when a force exceeding a predetermined value is applied to the holding ropes 12 and 14 and / or the holding ropes 24 and 11 in the middle. Means 22 are provided. The brake means 22 is formed, for example, by forming a ring at a predetermined portion of the rope and passing the overlapping portion through the tubular body 23. When the rope is pulled with a force of a predetermined value or more, friction with the tubular body 23 is achieved. The impact is absorbed by the wheel becoming smaller while resisting force.

  Patent Document 1 shows an example in which a protective fence for slopes is configured using a so-called ring net. According to this configuration, the ring net is installed between the upper support rope (11) and the lower support rope (12), and the impact due to falling rocks or the like is absorbed by this ring net. That is, a large impact can be absorbed by the extension of the upper support rope (11) and the lower support rope (12) by the brake device (6) and a wide projection to the valley side of the ring net when subjected to an impact. It is possible.

  Moreover, patent document 2 is disclosing the falling rock absorber in the slope. This document discloses a structure for avoiding a reduction in the vertical width of the net between the struts of the part that received the rock fall due to the impact when the rock falls. That is, a guide hole is provided in the upper and lower ends of a plurality of pillars that are erected at predetermined intervals on a natural mountain, and a slide wire is passed through the upper and lower guide holes respectively from the mountain side, and at the end of the valley of the slide wire A planar absorber (equivalent to a net) is attached. With this configuration, the part that has been impacted by falling rocks or the like does not absorb the impact by the support column, but the upper and lower slide wires extend (by the action of the brake means) and slide into the valley side in the slide hole. It is intended to absorb.

Japanese Patent No. 3131666 JP 2002-256517 A

  First, in the protective fence on the conventional slope, a holding rope (“support rope” in Patent Document 1) is stretched over the entire column of columns, and this holding rope is used, that is, the upper edge of the net on the holding rope. By attaching the part and the lower edge, the net is held in a stretched state. And this holding rope is installed independently as a separate thing from the holding rope stretched between the support | pillar and the natural ground on the mountain side in order to support each support | pillar.

  Therefore, when earth and sand collapses and falls on the net part, the net receives this earth and sand and protrudes to the valley side and extends. A load is also applied to the holding rope, and the holding rope extends within the allowable range. That is, due to the load caused by earth and sand, rock fall, etc., the portion of the holding rope that has been extended by the action of the brake means becomes slack and falls to the valley side. Therefore, the net attached to the holding rope is lowered to the valley side as the holding rope is loosened. In particular, lowering the top edge of the net means that the top and bottom width of the net is reduced. Following the first earth and sand and falling rocks, the falling second stage earth and sand and falling stones are It jumps over the narrow net and falls to the valley side. That is, as the vertical width of the net becomes smaller, the possibility of passage of earth and sand and falling rocks from the upper side of the net increases. Furthermore, the amount of overhanging the net on the valley side increases, raising the anxiety of residents in the area below the slope.

  Further, in the technique of Patent Document 1 described above, effective shock absorption is performed by extending the holding rope (supporting rope) and large overhanging of the net. Compared to a point-intensified instantaneous impact, the impact gradually increases with respect to the wide surface of the net. Therefore, it is required to secure the situation to receive earth and sand in a wide range rather than momentarily overhanging the net to the valley side. In addition, the situation where the holding rope is stretched and slackened means that the net fence height is lowered in a wide range in the case of landslide. In the case of such a landslide, in order to reduce the possibility of getting over the rock and landslide net following the first landslide when receiving the first landslide, It is desirable to keep the net fence height high. However, in such a conventional protective fence, there is a situation in which the height of the fence becomes low due to the extension of the holding rope or the extension of the net.

  Furthermore, in the technique of the above-mentioned Patent Document 2, the absorber support wire that supports the upper edge of the net is not fixed to the upper end of the support itself, but is attached to the slide wire that is inserted through the guide hole formed in the support. It is attached. Then, the upper and lower slide wires absorb the impact by the elongation due to the action of the brake means. However, when the upper slide wire extends from the guide hole of the column to the valley side, the height of the upper edge of the absorber support wire by the column is not maintained at all, and the length that extends from the column to the valley side The longer the is, the lower it will be. Accordingly, in the case of the collapse of the earth and sand described above, after receiving the earth and sand, the upper edge of the net is lowered in a wide range, and the amount of the net protruding to the valley side of the net is also increased. This is an unfavorable situation similar to the conventional guard fence described above.

  The present invention has been made in view of the above circumstances. The purpose of the present invention is to maintain the height of the net as large as possible even in the situation where a landslide or falling rock has occurred. An object of the present invention is to provide a protective fence system for slopes that can suppress the lowering of the function of catching sediment and falling rocks in the next stage due to the lowering and the net overhang amount.

In order to solve the above-mentioned problem, the protective fence system for slopes according to claim 1 is:
A strut row composed of a plurality of struts arranged on the slope at a predetermined interval over a required length range and tilted to the valley side and fixed to the ground, and a stretch between the struts in the strut row. An upper holding rope for holding a net, a lower holding rope for holding a net stretched between the lower positions of the columns of the column, and upper and lower by the upper holding rope and the lower holding rope. From the upper position of each strut and the strut so as to exert resistance against the inclination of the strut to the trough side when the net receives the fallen object from the mountain side. A load is applied to the stay rope, which is bridged between the mountain and the ground, and is provided on the stay rope, the stay rope and / or the lower hold rope, which regulates the inclination of the column to the valley side . Sometimes the rope stretches within a certain range In the protective fence system for slopes including the braking means, the upper holding rope and the end holding ropes respectively attached to the poles located at both ends of the column of the holding ropes are continuously connected. It is configured as a rope, and the attachment of the continuous rope at the upper position of each support is an unfixed attachment so that the rope can be moved in the alignment direction of the support columns at the attachment position. And

  According to this configuration, when landslides and falling rocks occur and these are received by the net, the net projects to the valley side, and at the same time, the holding rope is extended by the brake means provided on the holding rope. Further, the strut subjected to the impact via the net and the holding rope is inclined to the valley side. This inclination of the column is allowed by the extension of the holding rope stretched between the column upper position and the mountain on the mountain side by the function of the brake means.

  In this situation, in the system of the present invention, the upper holding rope spanned between the columns is a series of continuous ropes with the end holding ropes attached to the columns at both ends of the column. Thus, when the support column is inclined to the valley side, the required length of the entire continuous rope increases as the support column upper position moves to the valley side due to the inclination. And the attachment to the support | pillar of a continuous rope is non-fixed and can move to the support | pillar arrangement direction of a support | pillar row | line | column. Because this so-called lateral movement is possible, even if the holding rope between the struts is extended by the function of the provided brake means due to the impact from the earth and sand and falling rocks, the required length of the continuous rope is due to the inclination of the struts. Since the length of the cable becomes longer, the slack at the upper edge of the net due to the extension of the holding rope is eliminated. Therefore, even if the strut is inclined to the valley side, the upper edge of the net is held at the position of the holding rope stretched between the upper positions of the struts. A similar size is ensured. Furthermore, the net overhang due to the slack of the holding rope is also suppressed.

The slope fence system according to claim 2 is:
The continuous rope is formed of a single rope as a whole, and the brake means is provided at a predetermined location. That is, between the attachment position of the stay rope supporting the strut located at one end of the strut row to the ground and the attachment position of the stay rope supporting the strut located at the other end between It is composed of one rope including the holding rope. Therefore, formation of a continuous rope is achieved with a simple configuration.

The slope fence system according to claim 3 is:
A wire rope provided with a brake means is stretched between each pillar and a predetermined portion of the net, and the amount of protrusion of the net to the valley side of the net is regulated by the wire rope. To do.

  As a result, when catching the collapse of earth and sand, in addition to the net overhanging to the trough side of the net by preventing the slack of the holding rope between the struts, the net overhang regulation by the wire rope more accurately projects the net to the trough side. It becomes possible to prevent. Thereby, the situation where soil and sand are received on as wide a plane as possible is ensured by the absorption by the support column inclination of the extension of the holding rope and the more reliable restriction of the net to the valley side. In addition, when the protective fence system is installed in a place relatively close to a private house, it is possible to prevent anxiety for residents in the area below the slope due to overhanging the net by earth and sand.

  According to the protective fence system for slopes according to the present invention, it is possible to prevent the vertical width of the net from becoming narrow even in a situation where the broken sand and falling rocks are received by the net installed in the middle of the slope. And the function of receiving the next stage of sediment and rock fall does not deteriorate. As a result, it is possible to effectively prevent sediment, stones, etc. falling on the net part following the first earth and sand from falling over the top edge of the net and falling below the slope in the event of a landslide, The reliability of the protective fence installed on the slope is improved. In addition, the overhang of the net to the valley side is suppressed, and the anxiety at the time of landslide by the residents in the area below the slope is also reduced.

  FIG. 1 shows a schematic configuration of a protective fence system according to the present invention installed at an intermediate height position on a slope. Elements similar to those of the conventional protective fence of FIG. 9 are given the same reference numerals. As shown in the drawing, struts 10-1 to 10-n are erected at a predetermined height position on a slope over a predetermined length range at a predetermined interval to form one strut row. Each support column 10 is erected and fixed to the natural ground 100 in a state where it can be inclined to the valley side. The configuration for tilting the support column 10 is obtained, for example, by attaching the lower end portion to the natural ground 100 via a hinge. In general, the height of the columns 10 is about 2 m to 5 m, and the installation interval is about 5 m to 10 m. The size and the length of the column of columns are appropriately selected according to the scale and situation of the slope.

  A net 20 is installed on the trough side of the column of columns formed by the columns 10. The net 20 is, for example, a so-called rhombus wire net formed by forming a wire in a ring shape (diameter: 300 mm to 400 mm) and using a ring net formed by combining the wires or a high-strength hard steel wire (diameter: 3 mm to 5 mm) as a strand. Alternatively, various nets such as a wire net formed with a wire rope formed using a high-strength hard steel wire can be used.

  Conventionally, in order to hold the net 20 between the struts, a holding rope is spanned between the struts 10, and further, a retaining rope for supporting these is suspended on each strut 10. . However, the characteristic configuration of the present invention is a series of a holding rope portion for holding the net 20 and a portion of the end holding rope suspended on the columns 10-1 and 10-n located at both ends of the column. In this embodiment, the continuous rope 30 is formed by a single wire rope.

  That is, one wire extends from the anchor 16 installed on the mountain-side ground 100 near the pillar 10-1 to the anchor 18 installed on the mountain-side ground 100 near the pillar 10-n through each pillar 10. A continuous rope 30 is formed by stretching the rope. A brake means 22 is provided at a predetermined position of the continuous rope 30. In the present embodiment, the continuous rope 30 is wound in a ring shape and is inserted through a tubular body 23 that gives a predetermined resistance to a pulling force. As a result, when a tensile force of a predetermined value or more is applied to the continuous rope 30, the continuous rope 30 is slightly stretched due to a reduction in the ring-shaped portion of the brake means, thereby absorbing the tensile force.

  Each strut 10 is located between the upper position of each strut 10 and the anchor 19 installed on the natural ground 100 on the mountain side so as to exert resistance to the inclination to the valley side as in the conventional protective fence. A stay rope 24 is stretched, and a brake means 22 is also installed on the stay rope 24 as appropriate.

  Moreover, the edge part of the horizontal direction of the net | network 20 is attached to the net stop rope 60 suspended by the support | pillars 10-1 and 10-n of both ends, respectively. In the present embodiment, one rope is triangular between the end anchor 61 installed in the vicinity of the struts 10-1 and 10-n at both ends and the vertical positions of the struts 10-1 and 10-n. It is stretched over the shape. And it attaches to the part extended up and down along the support | pillar 10 of this net stop rope 60 so that the side edge of the net 20 may not remove easily. Each of the net stop ropes 60 is also provided with a brake means 22 at a predetermined location.

  FIG. 2 shows an example of attaching the continuous rope 30 to the upper position of each strut 10. As shown in the drawing, an insertion passage 32 having a size in which the continuous rope 30 can be inserted with a predetermined play is formed at an upper position of each column 10. In the present embodiment, the upper member 31 is attached to two opposing substantially semicircular side wall members 80 provided on the upper end portion 10 a of the support column 10, and the lower side of the upper member 31 is used as the insertion passage 32. The continuous rope 30 is passed through the insertion passage 32 and is movable in the lateral direction (the column arrangement direction in the column). Thus, the attachment of the continuous rope 30 at the upper position of the support column 10 is ensured in a state in which it can be moved laterally without being fixed.

  In addition, the net 20 is attached to the column 10 by arranging the auxiliary rope 60 in a state of being arranged on the continuous rope 30 and attaching both ends of the auxiliary rope 60 to the continuous rope 30 by the fixing members 61 and attaching the net 20 thereto. . The net shown in FIG. 2 is a so-called ring net, and only the ring member 62 positioned at the upper end of the ring net is shown for convenience of illustration. The auxiliary rope 60 is not an essential component, and it is also possible to attach a ring net directly to the continuous rope 30 as in the case of attaching a net that is not in the vicinity of the column 10. The ring net can be extended in the lateral direction, and the ring member 62 is laterally displaced with respect to the continuous rope 30, so that the lateral movement of the continuous rope 30 with respect to the support is not restricted.

  Further, as shown in the drawing, two retaining ropes 24 from the mountain side are attached to the insertion passage 32 at the upper end portion of the support column 10 by locking a locking ring portion 24a formed at the end portion thereof. It has been.

  FIG. 3 shows a state in which the continuous rope 30 is routed in the support column 10-1 positioned at the end of the support column. As shown in the drawing, the anchor 18 is installed in the natural ground after being passed through the insertion passage 32. It is stretched in the direction of

  According to the protective fence system having the above configuration, for example, when a landslide occurs and the net 20 catches the earth and sand at the place where the protective fence is installed, the net 20 projects to the valley side, and at the same time, the continuous rope 30 is provided. The continuous rope 30 is extended by the braking means 22. Further, the strut 10 subjected to the impact via the net 20 and the continuous rope 30 is inclined to the valley side. The inclination of the support column 10 is allowed by the extension of the holding rope 24 spanned between the upper position of each support column 10 and the natural ground 100 on the mountain side by the function of the brake means 22.

  FIG. 4 shows an example of a rhombus wire net as an example of another net suitably used in the system of the embodiment. As shown in the figure, a rhombus wire net 41 is formed as a strand by bringing three high-strength hard steel wires (diameter 3 mm to 5 mm) close to each other. In the present embodiment, the size of the rhombus is about 30 cm to 60 cm in the vertical direction and about 15 cm to 30 cm in the horizontal direction. The rhombus wire mesh 41 having such a configuration has a strong resistance to the collapsed sand and rocks and has a small net projection amount compared to a ring net or the like, and it is excessive without attaching a member for regulating the net projection. Net overhang is suppressed.

  FIG. 5 shows a situation when the support column 10 is inclined. As shown in the drawing, when the support column 10 is inclined to the valley side, the upper position of the support column 10 is moved to the valley side by a length L due to the inclination. Accordingly, the required length of the entire continuous rope 30 increases accordingly. And the attachment of the continuous rope 30 to each support | pillar 10 is non-fixed and substantially horizontal movement is possible as mentioned above. Therefore, even if the continuous rope 30 between the struts 10 is extended by the function of the provided brake means 22 due to an impact from earth and sand or falling rocks, the necessary length of the continuous rope 30 is increased due to the inclination of the strut 10. The slack of the upper edge of the net due to the elongation of the rope 30 is eliminated.

  That is, when the upper holding rope 12 and the end portion holding ropes 11 of the column 10 at both ends of the column are separately independent as in the prior art, as shown in FIG. The length of the ring-shaped portion of the brake means 22 is reduced and is slackened by the length X. Therefore, the height position of the upper edge portion 20a of the net 20 is also lowered downward. On the other hand, in the protective fence system according to the present embodiment, as shown in FIG. 5B, the slack of the continuous rope 30 is eliminated, so the position of the upper edge 20a of the net 20 is downward. It is maintained without going down. Therefore, the vertical width of the net 20 in a state where it receives earth and sand is kept as large as possible, that is, the height of the upper edge of the net 20 is kept high. Therefore, it can be avoided that the next falling earth and stone or stone cannot be caught due to the lower position of the upper edge of the net 20.

  FIG. 7 shows a schematic configuration of an embodiment having a configuration for regulating the amount of protrusion of the net 20 to the valley side. As shown in the figure, a wire rope 40 including a brake means 22 is stretched from each support column 10 to a predetermined portion of the net 20. The amount of protrusion of the net 20 to the valley side is restricted by the wire rope 40 for restricting the net protrusion.

  Thereby, when catching the collapse of the earth and sand, the net 20 maintains the fence height by eliminating the slack of the continuous rope 30 described above, and the amount of the net 20 protruding is also regulated. Further, the presence of the wire rope 40 makes it possible to more accurately regulate the tension toward the valley side. Therefore, when the protective fence system is installed in a place relatively close to a private house, it is possible to prevent damage from being caused by a large overhang of the net 20 due to earth and sand. Further, in the protective fence system of the present invention, the extension of the continuous rope 30 is absorbed by the tilting operation of the support column 10, and the slack of the continuous rope 30 between the support columns 10 is avoided. Therefore, the situation where earth and sand are received on as wide a plane as possible is ensured by the restriction of the protrusion of the net 20 to the valley side and the prevention of the lowering of the upper edge of the net 20.

  FIG. 8 specifically shows another example of the installation state of the column 10 and the attachment state of each rope. As shown in the drawing, an insertion passage 32 is formed at the upper end of the support column 10, and the continuous rope 30 is passed therethrough. Similarly, the holding rope 24 and the wire rope 40 for restricting the net overhang amount are also inserted and locked in the insertion passage 32. Moreover, it is understood that the attachment state of the lower end portion 10b of the support column 10 is rotatably fixed by the hinge portion 72 fixed to the base member 70 fixed to the natural ground 100 by the anchors 71 and 73. Moreover, in the said embodiment, although the lower holding rope 14 showed the example which provided the ring and other insertion members in the trough side surface of the support | pillar, the lower end part of the support | pillar 10 was fixed like this Embodiment. For example, you may make it insert in the channel | path 75a formed by attaching the cover body 75 in the structure for this.

  FIG. 9 is an explanatory view of the actual operation of the guard fence system according to the embodiment shown in FIG. As shown in the figure, the earth and sand collapse and are received by the net 20. And the support | pillar 10 inclines a little to the trough side. Therefore, no slack is generated in the continuous rope 30 between the support columns 10, and the upper edge portion of the net 20 held by the continuous rope 30 is also maintained at the upper position of the support column 10. Therefore, as shown by the broken line 200, in the case of the conventional holding rope, it is elongated by the function of the brake means to cause slack, and the position of the upper edge of the net 20 falls to the position indicated by P in the drawing. Therefore, a height difference Y between the point P and the upper position of the support column 10 is generated, and it is possible to catch earth and sand and stones falling after the first stage earth and sand at a higher position.

  Note that the net 20 is more accurately suppressed in the amount of protrusion due to the action of a wire rope 40 for restricting the net protrusion (not shown). Therefore, when the situation leading to the residential area is a steep inclined wall 300 as shown in the figure, the amount of overhanging the net 20 is increased, and anxiety to residents living in the lower area can be reduced. . Further, the upper edge portion 20a of the net 20 is not lowered downward, and the protection performance of the earth and sand in the area close to the private house is improved by maintaining the fence height of the net 20 and the overhanging regulation of the net 20.

  In each of the above-described embodiments, the lower holding rope 14 is formed by a single rope, similarly to the upper holding rope 12, and is fixedly attached at a lower position of the support column 10. The both ends of the lower holding rope 14 share the anchors 18 and 19 (the anchors to which the ends of the upper holding rope 12 are fixed) provided on the outer side of the column 10 at both ends of the column and on the mountain side. Is fixed). That is, it is installed as one rope between the anchors 18 and 19 on both sides. In addition, although a brake means is also installed, it is not necessary to have the same number as that provided on the upper holding rope 12, and the installation location is appropriately selected according to the situation of the installation site.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible within the range of the summary of invention. For example, the attachment of the continuous rope 30 to the upper position of the support column 10 can take various configurations as long as it is a configuration that can be fixed and moved laterally. Also, the brake means is not limited to the above-described ring-shaped configuration, and various known patterns can be used.

It is explanatory drawing which shows schematic structure of the guard fence system for slopes which concerns on this invention. It is explanatory drawing which shows the attachment structural example of the net | network in the post | mailbox vicinity position. It is explanatory drawing which shows the routing state of the continuous rope in the support | pillar of the support | pillar row | line | column edge part. It is explanatory drawing which shows the other structural example of the net | network used suitably for the system which concerns on embodiment. It is explanatory drawing which shows the movement distance by the inclination of a support | pillar. (A) And (B) is explanatory drawing which shows the effect | action of embodiment based on the inclination of a support | pillar. It is explanatory drawing which shows embodiment provided with the wire rope for a net | network protrusion regulation. It is explanatory drawing of the rope latching structure of a support | pillar upper part. It is explanatory drawing which shows the operation | movement effect | action by actual installation of embodiment. It is a schematic block diagram which shows an example of the conventional protective fence.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Support | pillar 11 End part rope 12 Upper side holding rope 14 Lower side holding rope 16, 18, 19 Anchor 20 Net 22 Brake means 24 Stock rope 30 Continuous rope 40 Wire rope for net extension regulation

Claims (3)

A column of columns arranged on the slope at a predetermined interval over a required length range and composed of a plurality of columns fixed to a natural ground so as to be inclined to the valley side,
An upper holding rope for holding the net stretched between the upper positions of the columns of the column;
A lower holding rope for holding the net stretched between the lower positions of the respective columns of the column,
A net for receiving fallen objects whose upper and lower sides are held by the upper holding rope and the lower holding rope;
And the net is laid between the said post of natural ground said as exhibits the resistance between the upper position of each strut of the mountainside from the strut for the inclination in the valley when receiving the falling objects from mountain A holding rope that regulates the inclination of the column to the valley side ;
A brake means provided on the upper holding rope, the holding rope and / or the lower holding rope, which allows the rope to extend within a predetermined range when a load is applied;
In the protective fence system for slopes including
The upper holding rope and the end holding ropes respectively attached to the poles located at both ends of the column of the holding ropes are configured as a series of continuous ropes,
The slope protection, wherein the continuous rope is attached at the upper position of each support column in a non-fixed manner so that the rope can be moved in the alignment direction of the support column at the attachment position. Fence system.   2. The slope protective fence system according to claim 1, wherein the continuous rope is formed of a single rope as a whole, and the brake means is provided at a predetermined location. Between each pillar and a predetermined part of the net, a wire rope provided with a brake means is stretched,
The protective fence system for slopes according to claim 1 or 2, wherein the amount of protrusion of the net to the valley side of the net is regulated by the wire rope.

Images