JP4188998B2 - Shock absorbing fence - Google Patents

Description

  The present invention relates to an impact-absorbing protective fence that attenuates and stops impact energy held by falling objects such as falling rocks and avalanches.

In order to protect roads and private houses from falling objects such as falling rocks and avalanches, a shock-absorbing protective fence is installed on the slope to absorb the impact. As these protective fences, a fence in which a protective net such as a wire or a wire mesh is horizontally stretched between support columns erected on a slope at a predetermined interval is known.
Japanese Patent No. 3390132

However, the conventional shock absorbing guard fence has the following problems.
<1> If the interval between the columns is increased, the construction cost is reduced, but the protective net is loosened at the center between the columns, resulting in insufficient fence height.
<2> Since the protective net is stretched horizontally between the columns, when the ground between the columns is raised, the height of the fence becomes insufficient at the raised portion.
<3> Since the protective net is stretched horizontally between the columns, if the ground between the columns is depressed, there will be a gap between the ground and the protective net, and falling rocks will pass through the gap. There is a possibility.
<4> In order to eliminate the above <2> and <3>, it is necessary to erect support columns according to the terrain, so the number of columns increases and the construction cost increases.
<5> When falling rocks or the like collide, the upper and lower sides of the protective net are bent so as to approach the center of the net, and the vertical width of the protective net decreases. Therefore, when the next falling rock falls, it may pass above or below the protective net.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a shock-absorbing protective fence having a simple structure that can secure a fence height and has a large impact energy attenuation efficiency. There is.

The first aspect of the present invention has been made in order to achieve the above object, between upright struts which at intervals of Jo Tokoro, the shock absorbing safety barrier stretched over the guard net consisting of a rope materials and mesh material, the fence height mounting member coupled to said network member while locking the rope materials, hooked along the longitudinal direction in the protective net, when an impact force is applied, the fence height holding material at least the It is characterized by detaching from the rope material.
The second aspect of the present invention is the first shot bright described above, the fence height retaining material, when an impact force is applied, is characterized in that it is bendable in the longitudinal direction.
The of the present 3 invention, the first or second shot Oite bright described above, the protective net, a plurality of rope materials passed between the upper and lower adjacent struts, mesh material that is stretched between the rope member It is characterized by comprising.
According to a fourth invention of the present application, in the above-described third invention, a shock absorber is provided in an overlapping portion in which the rope material provided from the crossing portion of the strut and the rope material or from both adjacent struts is superposed between the struts. The rope material is gripped.
According to a fifth invention of the present application, in the third or fourth invention described above, the strut is hollow, and a strut rope member fixed by an anchor at a lower portion of the strut is inserted into the strut, and an upper end portion of the strut The support rope material is gripped by a shock absorber provided on the head.
According to a sixth invention of the present application, in any one of the third to fifth inventions described above, at least a part of the fence height holding member is connected to the mesh member, and both ends are locked to the rope member, and an impact is made. When the force is applied, the fence height holding member is separated from the rope member.
According to a seventh invention of the present application, in any one of the first to sixth inventions described above, the fence height holding member causes the protective net to be placed outward from a line connecting the upper ends of adjacent struts or a line connecting the lower ends. It is characterized in that an extended portion is formed.
The eighth invention of the present application is characterized in that, in any one of the first to seventh inventions described above, the length of the fence height holding member is the same as or longer than that of the support column.
A ninth invention of the present application is characterized in that, in any one of the first to eighth inventions, the length of the fence height holding material is adjustable.

The present invention can obtain at least one of the following effects by means for solving the above-described problems.
<1> Since it is a protective fence with a simple structure consisting of a rope member passed between the upper and lower sides of the support and a net member stretched between the rope members, the construction is easy and the cost is low.
<2> Since the fence height holding material is disposed between the support columns, it is possible to prevent the protection net from slacking at the intermediate portion between the support columns and to secure the fence height.
<3> At the time of impact such as falling rocks, the impact energy is absorbed by the movement of the fence height retaining material, the separation of the fence height retaining material from the rope material and the bending of the fence height retaining material, so the impact energy attenuation efficiency increases. .
<4> Since the fence height retaining material is released without restraining the sliding of the rope material at the time of impact such as falling rocks, the original function of the protective fence is not impaired.
<5> The fence height holding material can be bent in the length direction to wrap rock fall and the like, and can prevent the rock fall and the like from falling from the protective net.
<6> Since the fence height retaining material is locked to the protective net without placing an anchor or the like, it can be easily constructed.
<7> Since the extended portion is formed using a fence height holding material that is longer than the support column, it is possible to increase the receiving area for receiving falling rocks, etc., compared to the case where a protective net is stretched horizontally between the support columns. .
<8> In order to increase the impact area, the vertical width of the protective net is secured even after the protective net is bent and deformed due to falling rocks, etc. When the falling rocks fall next, the upper or lower side of the protective net There is no passing through.
<9> Since the extended portion is formed using a fence height holding material longer than the support pillar, the fence height is secured even when the protective net is slack.
<10> Since the extended portion is formed using the fence height holding material longer than the support pillar, the protection net can be formed in accordance with the undulation of the topography between the support pillars.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(1) Configuration of Shock Absorbing Guard Fence As shown in FIG. 1, the shock absorbing guard fence of the present invention includes a column 10 that is erected at a predetermined interval, a protective net 20 that is stretched between the columns 10, and It consists of the fence height holding material 30 arrange | positioned in the direction which cuts the protection net | network 20 vertically.
Hereinafter, each component will be described in detail.

(2) Columns FIG. 1 and FIG. 2 show a first embodiment of the present invention, in which the column 10 is tilted, and a plurality of pipe-shaped columns 10 are erected on the inclined surface 40 at a predetermined interval. In each column 10, a column rope material 11 fixed at the lower surface to the slope 40 with an anchor is arranged, and these column rope materials 11 hold them at the upper end of the column 10 as shown in FIG. 3. Is held by the shock absorber 12.
The shock absorber 12 has a function of holding the strut rope material 11 and attenuating energy by allowing the strut rope material 11 to slide when a tension higher than the frictional resistance of the grip portion is applied. As the shock absorber 12, a known friction resistance type shock absorber such as one in which two plates are sandwiched by bolts and nuts can be used.
If necessary, a holding rope may be connected between each support column 10 and the inclined surface 40, or a shock absorber may be disposed at the end or middle of the holding rope.

(3) Protective Net The protective net 20 is a member for catching falling rocks and the like, and is composed of a rope member 21 provided between the columns 10 and a mesh member 22 connected to the rope member 21.
As shown in FIG. 1 and FIGS. 4A and 4B, the rope material 21 is held between the support columns 10 by gripping the end portion with the buffer 13.
As shown in FIGS. 1 and 4A, the shock absorber 13 is attached to the upper and lower ends of the support column 10, and connects both members at the intersection of the support column 10 and the rope member 21. Or as shown in FIG.4 (b), it arrange | positions between the support | pillars 10 and 10, and connects and stretches both the rope materials 21 in the superposition | polymerization part of the rope material 21 extended from both the support | pillars.
The shock absorber 13 has a function of gripping the rope material 21 and allowing the rope material 21 to slide and attenuating energy when a tension greater than the frictional resistance of the grip portion is applied.
As the shock absorber 13, a known friction resistance type shock absorber such as one in which two plates are sandwiched between bolts and nuts can be used.

  The mesh material 22 is a mesh material made of a wire mesh or a synthetic resin. As shown in FIG. 1, a coil material 23 or the like is wound around the entire length or a part of the rope material 21 and the mesh material 22 is connected in a movable state. .

(4) Shock Absorption by Protective Net and Struts When a rock fall or the like collides with the shock absorbing guard fence constituted by the above-described struts 10 and the protective net 20, sliding of the wire constituting the net 22 of the protective net 20 and downstream of the slope Impact energy is attenuated by bending deformation toward the side. Further, the impact energy that has acted on the protective net 20 acts on the rope material 21.

The impact energy acts as a tensile force on the rope member 21. When the tensile force exceeds the gripping force of the shock absorber 13, the rope material 21 slides in the shock absorber 13 against the grip force. The impact energy is attenuated by the frictional force at that time.
Therefore, when the rope material 21 is gripped by the shock absorber 13, as shown in FIG. 1, the rope material 21 is gripped so as to form an extra length portion 211 for sliding.

The impact energy that has passed through the net member 22, the rope member 21, and the shock absorber 13 is finally transmitted to the support column 10.
When impact energy acts on the support column 10 and the gripping force of the shock absorber 12 provided at the upper end of the support column 10 is exceeded, the support rope material 11 slides inside the shock absorber 12, and the friction force is a braking force against the load. The column 10 tilts while absorbing.
Further, when a holding rope is connected to the support column 10 or a buffer is provided on the holding rope, the impact energy is attenuated by the sliding resistance of the holding rope or the buffer.

When the support column 10 is erected, foundation concrete or the like is unnecessary, and only the anchor rope material 11 is anchored, so that it can be erected easily.
Since it has a simple structure in which the upper and lower rope members 21 and the net member 22 are stretched between the columns 10, the construction can be easily performed at low cost.
Since each of the net member 22, the rope member 21, and the support column 10 has a shock energy absorbing function, it is possible to easily construct a shock absorbing / protecting fence with high shock energy attenuation efficiency.

(5) Fence height holding material The fence height holding material 30 is a member for preventing slack of the protection net 20 between the support columns 10, and is arranged along the longitudinal direction of the protection net 20 between the support columns 10.
The length of the fence height holding member 30 is a columnar body that is the same as or longer than the column 10.
As shown in FIG. 1, the fence height holding member 30 is provided with a recess 31 for locking to the rope member 21 near the upper end and the lower end.
The fence height holding member 30 is provided with a joint 32 at least at one position in the length direction so that it can be bent into a plurality of pieces.
As shown in FIG. 5, the fence height holding member 30 is configured to expand and contract by, for example, providing a slide portion 34 so that the length can be adjusted.

The fence height holding member 30 is arranged to be locked to the rope member 21 provided between the columns 10.
Since the length of the fence height holding member 30 is the same as or longer than that of the support column 10, the protective net 20 is stretched in the longitudinal direction.
The rope material 21 is inserted into the recesses 31 near the upper end and near the lower end of the fence high retaining material 30 and locked with a pin 33 or the like as shown in FIG. To be configured. Further, at least a part of the fence height holding member 30 is connected to the mesh member 22 by a wire 24 or the like.
Since the fence high retaining member 30 is engaged with the rope member 21 of the protective net 20 without placing an anchor or the like, it can be easily constructed.

(6) Ensuring the fence height As shown in FIG. 6 (a), the shock absorption protection fence constructed by extending the protection net 20 between the support pillars 10 has the protection net 20 at the center between the support pillars 10 due to its weight. There is a case where the fence height becomes H1 by slackening to the valley side, and the necessary fence height H cannot be secured, resulting in insufficient fence height.
As shown in FIG. 6 (b), the shock absorbing guard fence of the present invention is provided with a fence height retaining member 30 between the columns 10, so that the guard net 20 is stretched in the longitudinal direction, and the guard net 20 is slackened. To prevent and secure the necessary fence height H.

(7) Ensuring the fence height according to the topography of the slope When the topography of the slope 40 between the columns 10 is raised, the fence height is insufficient at the raised portion of the slope 40.
Therefore, as shown in FIG. 7, the fence height holding material 30 is arranged on the protection net 20 of the raised portion, and the protection net 20 is stretched in the longitudinal direction to secure the fence height even when the topography is raised. be able to.

As shown in FIG. 8, when the topography of the slope 40 between the columns 10 is depressed, a fence height holding material 30 longer than the column 10 is arranged to stretch the protective net 20 in the longitudinal direction, By filling the gap A that occurs when the high retaining material 30 is not used, it is possible to prevent falling rocks and the like from passing through the gap A. In that case, the protection net | network 20 can be easily stretched to the clearance gap A by providing the anchor pin 35 in the lower part of the fence height retaining material 30, and fixing the fence height retaining material 30 to the slope 40.
Since the height of the fence height retaining member 30 can be adjusted at the site according to the topography of the slope 40, the construction efficiency is good.

(8) Shock absorbing action by the fence high retaining material As shown in FIG. 9, when a falling rock collides with the shock absorbing protective fence, the falling rock etc. will be pushed back by the weight of the fence high retaining material 30 locked to the protective net 20. The braking force is applied. The impact energy is attenuated, that is, absorbed by the braking force, and the impact force acting on the protective net 20 and the support column 10 is weakened.
In addition, since the fence height retaining material 30 is arranged on the mountain side of the protective net 20, a falling rock or the like directly collides with the fence height retaining material 30, and the fence height retaining material 30 receives most of the impact. The risk of breakage due to impact is reduced.
Since the fence height retaining member 30 is merely locked to the rope member 21 and attached to the mesh member 22 with a coil material or the like, even if it is damaged by an impact, the performance of the shock absorbing protection fence itself is not affected. It is easy and inexpensive to replace the high holding material 30.

  The fence height retaining material 30 gives weight to the protective net 20. As the rope material 21 of the protective net 20 slides and the net material 22 moves, the fence height retaining material 30 also moves, and the weight applied to the protective net 20 acts as a braking force against the impact. Improve shock absorption performance.

  The fence height holding member 30 is locked to the rope member 21, and is configured to be detached when subjected to an impact caused by falling rocks or the like. When detaching, the impact energy is absorbed against the resistance of the pin 33 or the like. By separating, the sliding of the rope material 21 is not restrained, the impact energy absorbing function is not disturbed, and the mesh material 22 is connected to the mesh material 22 by a wire 24 or the like. Since it acts as a braking force against an impact while being applied to 22, it does not affect the performance of the shock absorbing protective fence itself.

The fence height retaining material 30 is provided with a joint 32 at least at one position in the length direction, and when subjected to an impact caused by falling rocks, the joint 32 is detached and the fence height retaining material 30 is bent as shown in FIG. And
Since the joint 32 is disengaged against the frictional force, it absorbs impact energy when disengaged.
In addition, since the fence height retaining member 30 is bent and wraps rocks and the like, the rocks and the like can be prevented from spilling from the protective net 20.

(9) Formation of the extension portion When the fence height holding member 30 having a length longer than that of the column 10 is used, the rope member 21 is stretched in the length direction of the fence height holding member 30 and, as shown in FIG. An extended portion B is formed above the line connecting the upper ends of 10 and outward. By forming the extended portion B, it is possible to increase the receiving area for receiving a falling rock or the like as compared with the case where the protective net 20 is stretched horizontally between the support columns 10.
Further, in order to increase the receiving area, the vertical width of the protective net 20 is ensured even after the protective net 20 is bent and deformed by falling rocks, and when the falling rocks fall next, the upper side or the lower side of the protective net 20 There is no passing through the side.
By installing a plurality of fence height holding members 30, the shape of the extended portion B to be formed can be changed.

(10) Other Embodiments In the above embodiment, the fence high retaining member 30 is attached to the shock absorbing and guarding fence composed of the rope member 21 and the net member 22, but a plurality of wires horizontally mounted between the columns. A similar effect can be obtained by applying the fence height retaining material 30 to a rope that uses a rope as a protection net, or an impact-absorbing protection fence that is constructed by stretching only a wire mesh as a protection net.

The perspective view of the shock absorption guard fence of this invention Front view of the shock absorbing guard fence of the present invention Side view of the upper end of the column Explanatory drawing of gripping rope material with shock absorber Side view of fence high retaining material Illustration of securing the fence height of the shock absorbing protective fence by the fence height holding material Illustration of securing the fence height of the shock absorbing protective fence by the fence height holding material Arrangement of fence height retaining material according to the topography of the slope Side view of the state where rockfalls collide Side view of the state where rockfalls collide Explanatory drawing which provided the extended part in the upper part of the shock absorption guard fence of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Support | pillar 11 Support rope material 12 Shock absorber 13 Shock absorber 20 Protective net 21 Rope material 211 Extra length part 22 Net material 23 Coil material 24 Wire 30 Fence holding material 31 Recess 32 Joint 33 Pin 34 Slide part 35 Anchor pin 40 Slope

Claims (9)

In the shock-absorbing protective fence in which a protective net consisting of a rope material and a net material is stretched between struts erected at a predetermined interval,
The fence height mounting member coupled to said network member while locking the rope materials, hooked along the longitudinal direction in the protective net,
When the impact force is applied, the fence height retaining material is separated from at least the rope material,
Shock-absorbing protective fence. The shock absorbing protective fence according to claim 1 , wherein the fence high retaining material can be bent in a length direction when an impact force is applied. 3. The shock absorbing / protecting fence according to claim 1 , wherein the protective net is configured by a plurality of rope members passed between upper and lower adjacent struts and a net member stretched between the rope members. A shock-absorbing protective fence characterized by In the shock absorption protection fence according to claim 3 ,
Provide a shock absorber at the intersection of the struts and the rope material, or a superposition part where the rope material provided from both adjacent struts is overlapped between the struts ,
An impact-absorbing protective fence characterized by gripping the rope material. 5. The shock absorbing / protecting fence according to claim 3 or 4 , wherein the strut is hollow, and a strut rope member fixed by an anchor at a lower portion of the strut is inserted into the strut, and is attached to an upper end portion of the strut. An impact-absorbing protective fence, wherein the support rope material is held by a provided shock absorber. In the shock absorbing safety barriers according to any one of claims 3 to 5, at least a portion of the fence high holding member while connected to the network member, locking the both end portions in the rope member, the impact force The shock-absorbing protective fence, wherein the fence-height holding material is detached from the rope material when acted on. The shock absorbing guard fence according to any one of claims 1 to 6 , wherein the guard net is extended by the fence height retaining material outwardly from a line connecting the upper ends of adjacent struts or a line connecting the lower ends. A shock-absorbing protective fence characterized by forming a part. In the shock absorbing safety barriers according to any one of claims 1 to 7, the length of the fence high holding member is equal to or said post, and wherein the longer than, the shock absorbing safety barriers. In the shock absorbing safety barriers according to any one of claims 1 to 8, characterized in that the fence height retaining member is adjustable in length, the shock absorbing safety barriers.

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