JP3189779U - Buffer-reinforced flexible structure for rockfall protection facilities - Google Patents

Abstract

[PROBLEMS] To improve performance by compensating for the lack of functions of rockfall protection facilities, which can withstand a greater impact force, and has a long service life, is economical, and is easy to install and maintain. Provide a buffer reinforced flexible structure of the facility.
SOLUTION: A rock fall prevention net 5 is stretched on a vertical rope 4 suspended from a support column 2 standing on the top of a slope 3, and a pocket portion for storing rock fall by the fall rock prevention net 5 and the slope 3 is provided. 6 and a rockfall prevention facility 1 in which a suspension rope 7 is stretched between the support column 2 and the slope 3 a above the support column to prevent the support column 2 from being tilted. The suction net 9 is stretched in a skirt shape on the horizontal rope.
[Selection] Figure 1

Description

  The present invention relates to the improvement of rockfall protection facilities such as rockfall protection fences and rockfall protection nets, and more particularly to the buffer reinforcement flexible structure of rockfall protection facilities constructed on slopes where rockfall may occur near roads. .

  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 rainwater, or the slope from collapsing due to falling rocks or avalanches. In particular, a measure is generally taken in which a protective fence or a protective net is attached to a sloped part near a road or the like with a hanging rope or the like on a slope where there is a risk of falling rocks, and the rocks and avalanches are received and protected.

  Conventional rockfall protection nets are roughly classified into a fence type, a pocket type and a cover type. An overturned 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, and the ends of each vertical rope and horizontal rope anchored to the slope. By laying the wire mesh so that it fits the slope, it is a structure that supports rocks and prevents rocks and falling rocks.

  On the other hand, pocket type rock fall protection nets. A large number of pocket-forming struts are built on both sides of the swaths at intervals of 3 to 4 meters so that they can tilt in the vertical direction. A vertical rope is connected to the top of each strut, and both ends are supported by anchors. A plurality of horizontal ropes are arranged on the slope at regular vertical intervals, a wire mesh is stretched over the vertical and horizontal ropes to form a protective net, and the upper part of the protective net is supported by a post supported by a suspension rope. Suspended at a height, hanging a wire mesh with a rope in a curtain shape by each support, forming a pocket that opens to the entire width of the wire mesh with a rope, and buffering rock fall energy by storing rock fall etc. It has a structure to absorb.

  For example, in Patent Document 1, a plurality of vertical and horizontal reinforcing ropes, left and right vertical ropes, upper end horizontal ropes, and a plurality of lower half horizontal ropes are incorporated and reinforced in a wire mesh, and are formed on both side slopes such as swaths. The left and right struts are hinged to the anchors installed so that the swivels 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 column, and the upper side horizontal rope anchored at both ends to the slopes on both sides is slidably supported on the upper side of each column. Each end of the wire 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, etc. Construct and build in the laying part to catch Method of the falling rock protection nets have been described.

  On the other hand, rockfall prevention fences generally prevent falling rocks at the relevant points by maintaining the state where the fences stand up against the slopes. There is known a rockfall prevention fence in which a plurality of ropes are installed horizontally. This rock fall prevention fence is also provided with an impact absorbing material such as a wire mesh or a wire rope between columns that are erected at appropriate intervals. Such rockfall protection fences are placed on the slope where rockfalls are expected, and when the rockfalls collide with a receiving material such as a support or a net, they are deformed to absorb the impact force and pass through the fences. To prevent this.

Conventional rockfall prevention fences have the following problems.
(1) When the support column is deformed by falling rocks, the impact energy absorption capability of the support column itself is significantly reduced. Therefore, when a falling rock collides with the deformed support again, it easily deforms and loses its original function.
(2) It is necessary to replace the deformed column with a new column. However, it is very difficult to remove old struts or rebuild new struts at a site with poor scaffolding, and the replacement requires a lot of time and labor.

  It is designed based on the impact of falling rocks. However, if a new falling rock is expected after construction, the already constructed protective fence will be insufficient. In addition, even if the shock absorption capacity as estimated can be secured at the time of construction, it cannot be denied that the function will decline due to the accumulation of falling rocks and deterioration over time.

  As countermeasures against such a shortage of functions, the main purpose is to stop the use of existing protective fences and newly establish falling rock protection fences that satisfy the functions, and respond in order from the high-risk existing protective fences. Is the current situation. However, since the number of existing protective fences with insufficient functions is enormous, it is not realistic to reconstruct all of them because a huge amount of money is required. In other words, there is a need for an effective means to compensate for the lack of function while using the existing protective fence.

  Therefore, for example, in Patent Document 2, support columns are provided at predetermined intervals, a horizontal rope member is moored between the support columns in a state in which horizontal sliding is allowed, and both ends of the horizontal rope member are fixed. With a surplus part formed by polymerizing the rope material in the middle of the horizontal rope material, shielded by a wire net suspended between the horizontal ropes, and a clamping tool for clamping the surplus part with a constant force In addition, when a tension higher than a set tension is applied to the horizontal rope member, the horizontal rope member is formed with a buffer portion that absorbs the tension by extending the extra length while maintaining a certain frictional force.

  As other conventional rockfall prevention fences, as disclosed in Patent Document 3, reinforcing support columns are provided at the lower end portion of the support column so as to extend upward from the inclined surface. In addition, there is a support rope joint fitting provided. Further, in Patent Document 4, in a rockfall prevention fence in which a plurality of rope members are laid horizontally between struts standing on a slope at a predetermined interval, each of a plurality of rope members connected to the upper end portion of the struts. The other end is fixed via a slant drop on the upstream side of the column, and a protective belt that is tilted to the upstream side of the column is covered with a fan-shaped net between the rope members to avoid collisions with the small and medium-sized rock fall on the column. It is described what you did.

Japanese Patent No. 2916633 JP 2005-213747 A Japanese Patent No. 2787422 Japanese Patent Laid-Open No. 7-42118

  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.

  Further, the conventional wire net is formed by knitting a known wire in a rhombus net shape, which cannot withstand a large impact force. Further, when one portion of the wire net breaks, the tear spreads to the whole, and there is a problem that maintenance costs increase. Therefore, if the strength of the wire net can be improved, it is possible not only to withstand a greater impact force but also to prolong the life of the protective fence itself and to reduce maintenance costs.

  The present invention has been made in view of the above-described problems of the prior art, and aims to enhance effective performance to compensate for the lack of functions of a rockfall protection facility. That is, an object of the present invention is to provide a buffer-reinforcing flexible structure for a rockfall prevention facility that can withstand a greater impact force, has a long service life, is economical, and is easy to construct and maintain.

  In order to solve the above-mentioned problems, the buffer reinforcement flexible structure of the rockfall prevention facility according to the present invention is constructed by stretching a rockfall prevention net on a vertical rope suspended from a column standing on an inclined surface. In the rockfall prevention facility in which a pocket portion for storing rockfall is formed by the inclined surface and a suspension rope is installed between the pillar and the sloped ground above the pillar to prevent the pillar from tilting, the rockfall prevention net is provided. The first feature is that at least a part of the material is slacked. Further, a rock fall prevention net is stretched on a vertical rope suspended from a pillar standing on an inclined surface, and a pocket portion for storing rock fall is formed by the rock fall prevention net and the inclined surface. In a rockfall prevention facility where suspension ropes are stretched between the sloping ground and the upper slopes, a plurality of horizontal ropes are suspended between the suspension ropes, and a skirt-like net is attached to the horizontal ropes. A second feature is that a suction band is provided between the net for preventing falling rocks and the support or on the upstream side of the support. Furthermore, the third feature is that one or a plurality of suction bands are provided so as to be inclined from the upstream side to the slope side of the support column. Furthermore, the fourth feature is that the suction band is provided so as to be inclined in a reverse gradient from the slope side toward the upstream side of the support column.

In addition, the net used in the present invention is a synthetic resin net made of a polyester monofilament having the following characteristics and having a turtle shell-shaped mesh woven without welding or bonding to the twisted portion. Is preferred.
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, the following excellent effects are achieved.
(1) The shock can be absorbed by the flexible structure of the net having slack tensioned bending performance.
(2) The shock absorption efficiency of the rockfall prevention facility as a whole is improved by the protective belt formed between the pillar and the rockfall protection net or on the upstream side of the pillar. In other words, a suction belt is installed separately from the rockfall protection net, and the rockfall is temporarily received by this suction belt. Therefore, a part of the impact is absorbed, and even if an impact higher than the design acts on the rockfall protection net, it is damaged. There is nothing to do.
(3) It can be retrofitted to an existing rockfall protection facility, and the protection performance can be improved at a much lower cost than when it is newly constructed.
(4) When it is predicted that a larger load than the design impact will be applied, a reinforcement structure corresponding to the impact may be adopted. For example, a plurality of types of reinforcement structures according to the present invention may be used in combination. it can.
(5) It is safe and labor can be reduced, and not only the workability is improved, but also it is resistant to rust and corrosion, and the life cycle cost can be greatly reduced. In addition, the net itself can be recycled.

It is a side view which shows typically one Example of the buffer reinforcement flexible structure of the rock fall protection facility which concerns on this invention. It is a side view which shows typically the other Example of the buffer reinforcement flexible structure of the rock fall protection facility which concerns on this invention. It is a side view which shows typically the other Example of the buffer reinforcement flexible structure of the rock fall protection facility which concerns on this invention. It is a side view which shows typically the other Example of the buffer reinforcement flexible structure of the rock fall protection facility which concerns on this invention. It is a side view which shows typically the other Example of the buffer reinforcement flexible structure of the rock fall protection facility which concerns on this invention. It is a side view which shows typically the other Example of the buffer reinforcement flexible structure of the rock fall protection facility which concerns on this invention. It is a side view which shows typically the other Example of the buffer reinforcement flexible structure of the rock fall protection facility which concerns on this invention. It is a side view which shows typically the other Example of the buffer reinforcement flexible structure of the rock fall protection facility which concerns on this invention. It is a side view which shows typically the other Example of the buffer reinforcement flexible structure of the rock fall protection facility which concerns on this invention. It is a side view which shows typically the other Example of the buffer reinforcement flexible structure of the rock fall protection facility which concerns on this invention. It is a side view which shows typically the other Example of the buffer reinforcement flexible structure of the rock fall protection facility which concerns on this invention. It is a side view which shows typically the other Example of the buffer reinforcement flexible structure of the rock fall protection facility which concerns on this invention. It is a side view which shows typically the other Example of the buffer reinforcement flexible structure of the rock fall protection facility which concerns on this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  For example, there is one shown in FIG. 1 as a rockfall protection facility that prevents rockfalls on roads, railways, and houses below slopes. In this rock fall protection facility 1, a plurality of support columns 2 are properly set up on the top of the slope 3, and a rock fall protection net 5 is stretched on a vertical rope 4 suspended from the tip 2a of the support column 2. The net 5 and the slope 3 form a pocket portion 4 for temporarily storing falling rocks. Then, in order to prevent the column 2 from tilting due to the weight of the vertical rope 4 and the rock fall protection net 5 and the excessive weight of the rock fall stored in the pocket portion 6, the tip 2a of the column 2 and the slope 3a above the column 2 are A suspension rope 7 is stretched between them, and this suspension rope 7 is fixed by an anchor 8 provided on the slope 3a.

  And as shown in FIG.1 and FIG.2, the suction net | network 9 is slack-stretched and laminated | stacked on all or at least one part of the existing rock fall prevention net | network 5. As shown in FIG. The slack tension in the present invention is to add a bellows-like slack to the net in advance by gathers, scissors or the like, and laminate it on the existing net 5. This slack play reduces the impact energies of falling rocks and also improves the net strength by exerting a close-up function. The suction net 9 may be stretched not only on the front surface side of the existing net 5 but also on the back surface side.

  Moreover, it consists of a retaining wall constructed of concrete under the slope 3, a plurality of struts erected on the retaining wall at appropriate intervals, and a receiving material passed between adjacent struts. There is also a rockfall guard fence. An H-section steel or a steel tubular member is used as the support. As the impact material, various forms such as a wire mesh, a combination of a wire mesh and a wire rope, or a wire rope having a shock absorbing performance by friction are adopted. There are various forms of this rock fall protection fence 1, but basically the mainstream consists of a combination of a rigid structure of retaining walls and struts and a relatively flexible receiving material. Thus, the present invention is also configured to reinforce such an existing rock fall protection structure.

  An anchor 8 is placed on the slope 3a as a fixed part of the net 5 for falling rock prevention. The suspension rope 7 is fixed to the protruding portion of the anchor 8 from the ground. Various types of anchors 8 can be used, such as a lock bolt type in which a steel rod is embedded in a drilled hole formed on a slope, and a grout material is injected and fixed, in a sheath embedded in the drilled hole. Various types can be used such as a ground anchor type in which PC steel strands are fixed by a grout material. An attachment or the like having a ring for hooking or tying the suspension rope 7 is attached to the above-described projecting portion of the anchor 8 to the ground. A plurality of anchors 8 are placed on the inclined surface 3a with appropriate spacing.

  The suspension rope 7 is fixed to the anchor 8 described above. The suspension rope 7 is a linearly long member such as a resin rope, a wire, or a chain, and has a certain degree of bending performance. The suspension rope 7 is stretched between each anchor 8 and the column 2 and tied.

  As described above, the suction net 9 as the suction band is disposed between the adjacent hanging ropes 7 passed between the anchor 8 and the support column 2. As the suction net 9, various members having flexibility can be adopted, and a net knitted with a wire net, an expanded metal, a string material made of a synthetic resin fiber, or the like can be adopted. In the case of a net, its bending performance, that is, the shock absorbing power is large. In particular, the net is fixed between the suspension ropes 7 by the horizontal rope 11 and the lower end of the suction net 9 is freelanced (unfixed) in a skirt shape. Thus, when the falling rock 10 collides, not only the net is bent, but the suspension rope 7 and the lateral rope 11 that support the net 9 are attracted to the place where the impact is applied, and the rock falling energy is reduced. Accordingly, even when the falling rock 10 passes through the suction net 9, the impact on the existing net 5 is extremely small.

The net used in the present invention is preferably a synthetic resin net having a tortoiseshell-shaped 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.

  The gist of the present invention is that a plurality of horizontal ropes 11 are laid across the struts 2, and a suction net 9 is stretched between the horizontal rope members 11 in a skirt shape, so that an existing or new falling rock prevention net 5 is provided. A flexible structure that absorbs and relaxes the energy of the falling rock 10 is provided between the support column 1 and the upstream side of the support column 1. That is, one or a plurality of suction nets 9 are inclined from the upstream side of the support column 2 toward the slope 3 side, and the suction net 9 is reversed from the slope surface 3 side toward the upstream side of the support column 2. Naturally, it is also possible to arrange it so as to be inclined.

  Specifically, as shown in FIG. 3 to FIG. 13, various forms of the suction net 9 and the number of stretched nets 9 can be considered. It is conceivable that the rock fall 10 is first captured by the suction net 9 or collides with the skirt of the suction net 9 to attenuate the collision energy. Any configuration that avoids direct hits can be used. Therefore, the specific quantity, arrangement position, and strength of the suction net 9 are design matters and may be appropriately selected according to the situation at the site.

DESCRIPTION OF SYMBOLS 1 Falling rock protection facility 2 Strut 2a Strut tip 3 Slope 3a Slope 4 Vertical rope 5 Falling rock prevention net 6 Pocket part 7 Suspension rope 8 Anchor 9 Suction net (shock absorption band)
10 fallen rock 11 side rope

Claims (5)

A rock fall prevention net is stretched on a vertical rope suspended from a pillar standing on an inclined surface, and a pocket portion for storing rock fall is formed by the rock fall prevention net and the inclined surface. In a rockfall prevention facility in which a suspension rope is suspended between the sloping ground and the sloping ground, at least a part of the rockfall prevention net is slack-stretched, and the buffer reinforcement flexible structure of the rockfall protection facility . A rock fall prevention net is stretched on a vertical rope suspended from a pillar standing on an inclined surface, and a pocket portion for storing rock fall is formed by the rock fall prevention net and the inclined surface. In a rockfall prevention facility where a suspension rope is stretched between the sloping ground and a sloping ground, a plurality of horizontal ropes are suspended between the suspension ropes, and a skirt-like net is stretched on the horizontal rope. A shock-absorbing soft structure for a rockfall protection facility, characterized in that a suction band is provided between the rockfall prevention net and the pillar or upstream of the pillar. The buffer reinforcement flexible structure of a rock fall protection facility according to claim 2, wherein one or a plurality of suction bands are provided to be inclined from the upstream side of the support column toward the inclined surface side. The shock-absorbing protection structure for a rock fall protection facility according to claim 2, wherein the suction band is provided so as to be inclined in a reverse gradient from the inclined surface side toward the upstream side of the support column. The net is a synthetic resin net having a turtle shell-shaped mesh made of a polyester monofilament having the following characteristics and woven without welding or bonding to a twisted portion. The buffer reinforcement flexible structure of the rock fall protection facility according to claim 4.
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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