JP2012225036A - Guard fence - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guard fence which has large cushioning effect and absorbs larger shock energy with simple constitution.SOLUTION: The guard fence has a plurality of poles 14 stood on an upper surface of a concrete base 12, and a pair of wire ropes 20, 21 to which upper and lower ends of a metal gauze 16 spread over the plurality of poles 14 are fixed and which are extended between upper ends and lower ends of a pair of poles 14. The guard fence includes a first cross wire 30 which is coupled to a lower end of one of at least three mutually adjacent poles 14, engaged with an upper end of a pole 14 at an intermediate position, and coupled to a lower end of the remaining pole 14. The guard fence includes a second cross wire 30 which is installed vertically symmetrically with the first cross wire 30. The guard fence has a columnar spacing material 38 which has upper and lower ends coupled together with the metal gauze 16 and is arranged between the poles 14 at a predetermined interval. The guard fence has cushioning devices 22, 23 at both ends of wire ropes 20, 21. The guard fence has looped cushioning devices 32 at both ends of a cross wire 30.

Description

  The present invention relates to a protective fence that is constructed on a mountainside slope such as a road in a mountainous area and receives falling rocks, snow, and the like to prevent falling and inflowing onto a road or the like.

  2. Description of the Related Art Conventionally, a protective fence is known that is constructed on a slope of a mountainside, etc., and receives falling rocks, snow, and the like to prevent falling and inflowing onto a road or the like. For example, as disclosed in Patent Documents 1 and 2, such a protective fence is provided with pillars on a concrete foundation or the like at predetermined intervals, a horizontal rope member is laid between each pillar, and the horizontal rope member is Both ends are held, and the space between each support is shielded by a wire net locked to a horizontal rope member. The horizontal rope member is attached to the column by a shock absorber in a state in which the column attachment end portion is extended from the column by a certain length and allowed to slide in the horizontal direction. The shock absorber that holds the end of the horizontal rope material has a pair of gripping bodies that grip the horizontal rope material with a predetermined strong frictional force, and both gripping bodies are tightened by tightening means such as bolts and nuts to hold the friction. ing. This protective fence is also provided with intermediate pipe struts between a pair of struts in which both ends of the horizontal rope member are locked among a plurality of struts. On the front side of the outer periphery of the intermediate pipe column, an engaging portion that engages with the horizontal rope member is provided, and the intermediate pipe column, the horizontal rope member, and the net are integrally connected.

  When the net is impacted by falling rocks, etc. and a tension higher than the set tension is applied to the horizontal rope material through the net, this protective fence will end with the horizontal rope material holding a certain friction force by the shock absorber. The extra length of the part is drawn between the columns, and the collision energy is absorbed by the net or horizontal rope material.

JP 2007-277896 A JP 2010-37765 A

  In the structure of the protective fence described above, it is necessary to increase the number of shock absorbers and horizontal rope members or increase the strength of the horizontal rope members in order to absorb a larger amount of energy. If the number of horizontal rope members increases, the construction of the horizontal rope members takes time, the number of parts increases, the construction becomes complicated, and the cost increases as a whole. In addition, there is a problem that it takes cost to make the material stronger.

  In addition, the conventional protective fence has a structure in which the ends of a large number of horizontal rope members are gripped by shock absorbers, and the shock absorbers are connected to the rope struts, which increases work man-hours and hinders efficient construction. It was. Furthermore, the shock absorbers attached to the horizontal rope members tend to vary in their tightening force, and if excessive tension is applied to some horizontal rope members that are biased due to variations in the tightening force, the desired impact energy is applied. It breaks before absorbing, and the impact absorbing effect such as falling rocks is reduced. As a result, there is a risk of breaking the net or penetrating rocks.

  Furthermore, since all of the above-mentioned protective fences are inserted in the middle of the horizontal strut material through the hole of the intermediate strut, when impacts such as falling rocks or avalanches are applied to the rope material, There was also a problem that a concentrated force was applied and the rope material was easily damaged from this portion.

  The present invention has been made in view of the problems of the background art described above, and an object of the present invention is to provide a protective fence with a simple configuration, a large buffering effect, and capable of absorbing a larger impact energy.

  The present invention provides a concrete foundation installed on a mountain side slope in a mountainous area, a plurality of support posts erected on the upper surface of the concrete foundation, a wire mesh stretched between the plurality of support posts, and the wire mesh Upper and lower ends are fixed, a pair of wire ropes constructed with a predetermined tension between the upper ends of the pair of struts and the lower ends, and a lower end of one of the struts adjacent to each other. Similarly to the first cross wire connected to the lower end of the other strut by engaging the upper end of the strut that is connected and located in the middle, similarly to the upper end of one of the at least three struts A second cross wire coupled to the lower end of the strut that is connected and positioned in the middle and connected to the upper end of the other strut, and the upper and lower ends of the pair of wire ropes are coupled to the pair of wire ropes together with the wire mesh. At regular intervals Columnar spacing members, and shock absorbers are provided at both ends of the wire rope, and the shock absorbers have a predetermined friction at a position where the end portions of the wire rope extend a predetermined length. A holding member that is slidable and held by force, and is provided with a loop-shaped shock absorber at both ends of each cross wire, and this loop-shaped shock absorber has a crossing portion of the loop of the cross wire. It is a protective fence provided with a clamping member that is slidable while being clamped with a predetermined frictional force.

  The first and second cross wires intersect each other on a trough side surface of the wire mesh between a pair of adjacent columns. Further, the first and second cross wires are arranged vertically symmetrical to each other, and a central portion of each cross wire is inserted into a wire insertion ring protruding from both ends of the support column and bent into a mountain shape. It is what.

  Furthermore, the loop-shaped shock absorbers provided at both ends of each cross wire have a sliding body attached to the cross wire so as to be slidable with a predetermined friction force at an intermediate portion of the loop. .

  A plurality of the spacing members are arranged in parallel between the support columns and are connected to the wire mesh.

  Moreover, the said support | pillar may be fitted and fixed to the existing support | pillar member provided in the said concrete foundation.

  According to the protective fence of the present invention, with a simple configuration, the buffering effect is large, the impact energy can be absorbed more, and the safety of the construction area can be further enhanced.

  In particular, since the cross wire is installed in a mountain shape, it is installed symmetrically in the vertical direction, and is provided so as to intersect between a pair of support columns, it is always possible to receive impact energy directly by three or more support columns. It has a great buffering effect.

  Furthermore, in addition to the metal mesh, the impact energy is absorbed by the spacing member and the impact force is transmitted to the wire rope, so that a large buffering effect is exhibited.

  In addition, new construction is easy and can be easily installed when an existing guard fence is updated.

It is a perspective view which shows the guard fence of one Embodiment of this invention. It is a partial front view of the protection fence of this embodiment. They are a partial enlarged plan view (a) and a partial enlarged front view (b) of the protective fence of this embodiment. It is a partial enlarged plan front view of the wire rope of the protection fence of this embodiment, the end of a cross wire, and the support | pillar front-end | tip part. It is a partial enlarged plane front view of the intermediate part of a wire rope of a protection fence of this embodiment, and a cross wire, and a support | pillar tip part. It is the partial expanded plain front view of the intermediate part of the wire rope of the protection fence of this embodiment, the edge part of a cross wire, and the support | pillar front-end | tip part. It is a partial expanded sectional view of the space | interval material of a guard fence of this embodiment, and a wire mesh. It is the partial expansion front view (a) and partial expansion rear view (b) of the space | interval material of a guard fence, and a metal-mesh of this embodiment. It is a front view explaining the shock absorption function of the protection fence of this embodiment. It is a top view explaining the shock absorption function of the protection fence of this embodiment. It is a right view explaining the shock absorption function of the protection fence of this embodiment.

  Hereinafter, an embodiment of a protective fence according to the present invention will be described with reference to the drawings. The protective fence 10 of this embodiment is provided on mountain slopes such as roads and tracks in mountainous areas, and is installed along dangerous places to prevent falling rocks and avalanches. As shown in FIG. 1, a concrete foundation 12 having a trapezoidal cross section is provided on the slope on the mountain side, pillars 14 are erected on the upper surface 12 a of the concrete foundation 12 at predetermined intervals, and a wire mesh 16 is stretched on the pillar 14. Has been.

  As shown in FIGS. 2 and 3, the support column 14 is fixed to each other as shown in FIGS. 2 and 3 by being fitted to an embedded column 14 a such as H steel embedded in the concrete foundation 12 and having a head protruding from the upper surface 12 a. ing. In the fixing method, a buffer material is packed between the inner wall of the column 14 and the buried column 14a and fixed. Moreover, you may fix with resin or concrete. A cap 14 b is fitted and closed on the head of the cylindrical support column 14. The buried pillar 14a may be a pillar member such as an existing pillar or an existing anchor member provided on the concrete foundation 12.

  The wire mesh 16 is stretched on the support column 14 on the mountain side of the protective fence 10. The vertical width of the wire mesh 16 is substantially equal to the height of the support pillars 14, located from the top of the support pillars 14 to the front surface 12 a of the concrete foundation 12, and the upper and lower wire ropes 20 described later over a predetermined installation range on the mountain side slope. , 21 and is fixed to the column 14.

  Between the tops of the columns 14, both ends are connected to the tops of the columns 14, and an upper chord material 18, which is a long metal material that maintains a constant distance between the columns 14, is constructed, and both ends are fixed to the upper ends of the columns 14. Has been. Further, a steel wire rope 20 connecting the tops of the columns 14 is installed on the mountain side surface 14 c at the upper end of the column 14. Similarly, a wire rope 21 connecting the tops of the columns 14 is also erected on the mountain side surface 14 c at the lower end of the column 14. As shown in FIGS. 3 and 4, the wire ropes 20, 21 are connected at both ends 20 a, 21 a to shock absorbers 22, 23 provided at the upper and lower ends of the column 14 every few. The shock absorbers 22 and 23 slightly extend the both ends 20a and 21a of the wire ropes 20 and 21, and the wire ropes 20 and 21 are applied with a predetermined frictional force between the holding members 22a and 23a. The wire ropes 20 and 21 are slidable with respect to the holding members 22a and 23a with a predetermined tension or more.

  The shock absorbers 22 and 23 have U-shaped connecting members 22b and 23b, and the connecting members 22b and 23b engage with a locking bracket 24 projecting from the mountain side surface 14c of the upper and lower ends of the support column 14. ing. And holding member 22a, 23a is being fixed to the both ends of connector 22b, 23b. A stopper 25 that engages with the holding members 22a and 23a and stops sliding is integrally fixed to both ends of the wire ropes 20 and 21.

  The wire ropes 20 and 21 are installed between a pair of support columns 14, and one or more other support columns 14 are arranged at equal intervals between the pair of support columns 14. As shown in FIGS. 5 and 6, a wire insertion ring 26 through which the wire ropes 20 and 21 are inserted protrudes from the mountain side surface 14 c of the upper and lower ends of the column 14 positioned at the intermediate portion of the wire ropes 20 and 21. ing. A portion of the wire insertion ring 26 into which a later-described cross wire 30 is also inserted is provided with a pair of wire insertion rings 26, and the wire ropes 20, 21 and the cross wire 30 are respectively paired with a pair of wire insertion rings 26. Is inserted.

  As shown in FIGS. 4 and 6, the cross wire 30 is made of a steel wire that is thicker than the wire ropes 20 and 21, and protrudes from the opposite side surfaces 14 d of the upper and lower ends of every other column 14. Both ends are connected to the connecting portion 28. As shown in FIG. 5, the intermediate portion of the cross wire 30 is inserted into a pair of wire insertion rings 26 protruding from the mountain side surface 14 c of every other intermediate support column 14. Thereby, as shown in FIG. 2, the cross wire 30 is constructed so as to draw an equilateral mountain shape.

  As shown in FIGS. 4 and 6, loop-shaped shock absorbers 32 are provided at both ends of the cross wire 30. The loop-shaped shock absorber 32 is formed such that both ends of the cross wire 30 draw a loop once, and the ends thereof are connected to the connecting portion 28. The loop-shaped shock absorber 32 includes a sandwiching member 34 that sandwiches the intersecting portion of the loop with a constant frictional force, and a sandwiching member in the middle of the loop when the cross wire 30 slides on the sandwiching member 34 and the loop becomes small. A sliding body 36 that abuts on 34 and increases the resistance when the cross wire 30 slides is provided. The sliding body 36 is a member in which a metal member is slidably held on the cross wire 30 with a predetermined frictional force. As shown in FIG. 2, the cross wires 30 have end portions located above and below the pair of support columns 14, and a pair of cross wires 30 that are spanned symmetrically cross each other at the center portion. It is constructed between the columns 14.

  The wire mesh 16 faces the mountain side surface 14c of the support column 14 and is stretched on the mountain side from the wire ropes 20 and 21 and the cross wire 30. The metal fitting 16 and the wire insertion ring 26 are disposed therethrough. As shown in FIGS. 7 and 8, the upper and lower ends of the wire mesh 16 are provided with U-shaped fixing brackets 40 at both ends of a metal columnar spacing member 38 and male screw portions at both ends of the fixing bracket 40. It is fixed to the wire ropes 20 and 21 by a pair of nuts 42 screwed together. Several spacing members 38 are arranged at equal intervals between the pair of support columns 14, whereby the wire mesh 16 is integrally connected to the upper and lower wire ropes 20, 21. Further, a fixing bracket 40 is similarly provided in the middle of the spacing member 38 to fix the wire mesh 16 and the spacing member 38.

  Next, the buffer function of the protective fence 10 of this embodiment will be described. The case where the rock D collides with the center part between a pair of branch 14 of the mountain side surface of this protective fence 10 is demonstrated. When the rock D collides with the protective fence 10, the wire mesh 16, the wire ropes 20 and 21, and the cross wire 30 are deformed to the valley side by the kinetic energy at the time of the collision of the rock D, and are stretched. Since the cross wire 30 is installed on the valley side of the wire mesh 16, even if the rock D does not hit the cross wire 30, tension is applied to the cross wire 30 due to the displacement of the wire mesh 16. Moreover, since the wire ropes 20 and 21 are integrally connected by the spacing member 38 and the fixing bracket 40, the force applied to the wire mesh 16 is also transmitted to the wire ropes 20 and 21.

  The absorption of the collision energy of the rock D is first absorbed by the resistance to the deformation of the wire mesh 16 when the wire mesh 16 is extended while being deformed. Further, due to the deformation of the wire mesh 16, tension is applied to the wire ropes 20, 21, and a force acts to pull out the wire ropes 20, 21 against the buffer devices 22, 23 at both ends. The wire ropes 20 and 21 are elastically deformed and stretched by the impact energy of the rock D, and in some cases are stretched to the plastic deformation region.

  Furthermore, since both ends of the wire ropes 20 and 21 are held by the holding members 22a and 23a of the shock absorbers 22 and 23 with a predetermined frictional force, the tension applied to the wire ropes 20 and 21 is reduced by the holding members 22a and 23a. It rises until it exceeds the resistance due to static friction at 23a. When the tension applied to the wire ropes 20 and 21 exceeds the static frictional force of the holding force by the holding members 22a and 23a, the wire ropes 20 and 21 slide with respect to the holding members 22a and 23a. Normally, the dynamic friction force is smaller than the static friction force, so that once the wire ropes 20 and 21 start to slide relative to the holding members 22a and 23a, the resistance force at this portion becomes small. Energy absorption starts with resistance.

  At the same time, the impact energy is absorbed by the cross wire 30. The collision energy is absorbed by energy absorption by the frictional resistance between the holding member 34 of the loop-shaped shock absorber 32 and the cross wire 30. Also in this case, due to the deformation of the wire mesh 16, tension is applied to the cross wire 30, and a force acts so as to pull out the cross wire 30 from the holding member 34 against the loop-shaped shock absorbers 32 at both ends. The cross wire 30 is also elastically deformed and stretched by the impact energy of the rock D, and in some cases is stretched to the plastic deformation region. At this time, since the cross wire 30 is held in a loop shape with a predetermined frictional force by the holding member 34 of the loop-shaped shock absorber 32, the tension applied to the cross wire 30 is reduced by the holding member 34 of the loop-shaped shock absorber 32. When the resistance due to static friction is exceeded, the cross wire 30 slides so that the loop of the loop-shaped shock absorber 32 shrinks. At this time, since the dynamic friction force is smaller than the static friction force, once the cross wire 30 starts to slide with respect to the holding member 34, the resistance force at this portion becomes small. Absorption begins. When the sliding body 36 provided in the middle of the loop comes into contact with the holding member 34, a frictional resistance between the sliding body 36 and the cross wire 30 is added, the resistance to the impact is increased, and the shock buffering effect is increased. Further, since the sliding body 36 is provided in the middle of the loop, the holding member 34 having a small frictional force at one end can be obtained due to the magnitude of the resistance caused by the static friction of the loop-shaped shock absorber 32 at both ends of the cross wire 30. However, even if the cross wire 30 starts to slide, resistance due to static friction is applied by the holding member 34 coming into contact with the sliding body 36 of the loop-shaped shock absorber 32. As a result, the resistance due to the frictional force at one end of the cross wire 30 increases as a whole, and becomes a frictional resistance exceeding the frictional resistance of the clamping member 34 at the other end. The cross wire 30 starts to slide, and the buffer function by the loop buffer devices 32 at both ends is reliably exhibited.

  Further, an impact force is applied to the column 14 via the wire mesh 16, the wire ropes 20 and 21, and the cross wire 30, the column 14 is elastically deformed, and further plastically deformed to absorb the impact energy of the rock D. At this time, the force applied to the column 14 is transmitted through the wire mesh 16, the upper chord material 18, and the wire ropes 20 and 21. The upper chord member 18 is stretched between a pair of adjacent struts 14 and the strut 14 to which the impact is applied is displaced, whereby force is transmitted to the adjacent strut 14 via the adjacent upper chord member 18 so that the impact energy is reduced. Absorbed. Further, since the wire ropes 20 and 21 are connected to other struts 14 via the wire insertion ring 26 with one or a plurality of struts 14 therebetween, the rocks D exceed the adjacent struts 14. This shock is transmitted to three or more struts 14 and exhibits a large buffer function. Similarly, the cross wire 30 is also erected in a mountain shape with one strut 14 in between, and the two cross wires 30 intersect so that the impact of the rock D is caused by the three struts 14. It can be received and exerts a large buffer function.

  According to the protective fence 10 of this embodiment, the structure which exhibits a big buffer effect can be comprised with few members called the wire ropes 20 and 21 and the cross wire 30 as a rope material, and construction in a mountainous area is easy. In addition, the cost can be reduced. In particular, since the cross wire 30 is erected in a mountain shape with a single support 14 interposed therebetween, and is installed so as to be vertically symmetrical and intersects between a pair of support 14, the impact energy is always three. It can receive directly with the above support | pillar 14, and a buffer effect is large. Further, since the impact energy is absorbed by the spacing member 38 in addition to the wire mesh 16 and the force is transmitted to the wire ropes 20 and 21, a large buffering effect is exhibited. Moreover, the adjustment of the impact energy that can be absorbed can be arbitrarily set by adjusting the tightening force of the holding members 22a and 23a and the clamping member 34 against the wire ropes 20 and 21 and the cross wire 30.

  In addition, the protection fence of this invention is not limited to the said embodiment, construction of a support | pillar can be applied suitably, such as a new installation or the update of an existing support | pillar, and uses and a magnitude | size are also set arbitrarily. . The material of the wire net, the material of the wire rope, the material of the cross wire, and the warp can be selected as appropriate, and the structure of the holding member and the loop-shaped shock absorber may be any as long as it can frictionally hold the rope.

DESCRIPTION OF SYMBOLS 10 Guard fence 12 Concrete foundation 14 Support | pillar 14a Embedded pillar 16 Wire mesh 18 Upper chord material 20, 21 Wire rope 22, 23 Shock absorber 22a, 23a Holding member 22b, 23b Connector 24 Locking metal fitting 26 Wire insertion ring 28 Connection part 30 Cross wire 32 Loop shock absorber 34 Holding member 36 Sliding body 38 Spacing material 40 Fixing bracket

Claims (6)

A concrete foundation installed on a mountain side slope in a mountainous area, a plurality of support posts erected on the upper surface of the concrete foundation, a wire mesh stretched between the plurality of support posts, and upper and lower ends of the wire mesh A pair of wire ropes that are fixed and are installed with a predetermined tension between the upper end portions and the lower end portions of the pair of struts, and are connected to the lower end portions of at least three struts adjacent to each other in the middle. Similarly to the first cross wire engaged with the upper end portion of the supporting column and connected to the lower end portion of the other supporting column, and similarly connected to the upper end portion of one of the at least three supporting columns and in the middle A second cross wire that engages with the lower end portion of the support column and is connected to the upper end portion of the other support column, and the upper and lower end portions are connected to the pair of wire ropes together with the wire mesh together with a predetermined distance between the support columns. Columnar arranged in And a spacer,
Shock absorbers are provided at both ends of the wire rope, and the shock absorbers are provided to hold the wire rope with a predetermined frictional force and to be slidable at a position where the end of the wire rope extends a predetermined length. Provided holding member,
A loop-shaped shock absorber is provided at both ends of each cross wire, and this loop-shaped shock absorber clamps a cross portion of the loop of the cross wire with a predetermined frictional force and is slidably provided. A protective fence characterized by comprising   2. The protective fence according to claim 1, wherein the first and second cross wires intersect each other on a trough side surface of the wire mesh between a pair of adjacent columns.   The first and second cross wires are arranged symmetrically with respect to each other, and a central portion of each cross wire is inserted into a wire insertion ring protruding from both ends of the support column and bent into a mountain shape. The protective fence according to claim 2.   The loop-shaped shock absorber provided at both ends of each cross wire has a sliding body attached to the cross wire so as to be slidable with a predetermined friction force at an intermediate portion of the loop. Guard fence.   The protective fence according to claim 1, wherein a plurality of the spacing members are arranged in parallel with each other between the support columns and are connected to the wire mesh. The protective fence according to claim 1, wherein the support column is fitted and fixed to an existing support member provided on the concrete foundation.

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