JP3692457B2 - Shock absorbing fence and shock absorbing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an impact absorbing fence and an impact absorbing method for absorbing impact forces such as falling rocks, avalanches, and falling sand.
[0002]
[Prior art]
The shock-absorbing fence is composed of struts erected on the slope at a predetermined interval and a rope-like protective net installed between these struts, and absorbs the impact force by the deformation force of the protective net. It can be broadly classified into “non-slip type” and “slip type” that uses a friction resistance type shock absorber to absorb impact by sliding resistance.
In the slip type, as shown in FIG. 11, a shock absorber e is provided at the intersection of the crossed ropes d, and a horizontal rope g straddling a plurality of shock absorbers e provided in each support column f as shown in FIG. 12. There are known a configuration in which the end portion and the intermediate portion are gripped, and a configuration in which both ends of the horizontal rope g are gripped by the shock absorber e in units between the struts f and f as shown in FIG.
[0003]
[Problems to be solved by the invention]
The conventional shock absorbing fence has the following problems.
<A> The non-slip type has not only lower shock absorption performance by the protective net compared to the slip type, but also requires the entire fence to be designed to be large and heavy, and there is a drawback that the shock absorption cost is high.
<B> Because the slip type of the slip type increases the amount of deformation of the protective net when receiving a non-slip, it will not be adopted when the fence installation site approaches various transportation facilities (roads or tracks) or houses. , Restricted by the installation site.
Furthermore, since a large number of shock absorbers are used, it takes a lot of work and time for the shock absorber installation work and the rope gripping work.
<C> Both types have a common difficulty: the protective net is single, and the rope diameter that can be used is limited, so the receiving performance cannot be dramatically improved.
[0004]
This invention is made | formed in view of the above point, The place made into the objective is to provide the following shock absorption technique.
(1) Shock absorption technology that can exhibit high shock absorption performance.
(2) Shock absorption technology that can suppress the amount of overhang when receiving.
(3) Shock absorption technology with excellent workability.
[0005]
[Means for Solving the Problems]
The invention according to claim 1, a post erected at predetermined intervals, the buffer function of both ends near the wound possible length of the rope material into a loop and gripped by bumper between said post An impact absorbing fence comprising a plurality of protective loops, wherein the protective loops are looped between the support columns in a loop shape and horizontally mounted.
The invention according to claim 2, a plurality of struts erected at predetermined intervals, near both ends of the rope material wrapping possible length in a loop between adjacent struts, the extra length portion It consists of a plurality of protective loops that are formed by holding them with shock absorbers. The impact is characterized in that the protective loops are looped around adjacent struts while sharing the struts and looped horizontally in a chain. Absorption fence.
The invention according to claim 3 is the impact absorbing fence according to claim 1 or 2, characterized in that the protective loop has a rope length that can be wound between the support columns in a loop shape a plurality of times.
The invention according to claim 4, gripped by Near both ends of the rope material wrapping possible length in a loop between the mounting posts erected at predetermined intervals, bumper forms the extra length portion protection loop is formed by, characterized in that it absorbs the buffering action of the protection loops lateral bridging wound around in a loop between the posts, the impact by sliding resistance of the protection loops and struts, shock absorption method It is.
[0006]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1
Embodiments of the present invention will be described below with reference to the drawings.
[0007]
<A> Configuration of Shock Absorbing Fence FIG. 1 is a perspective view of a shock absorbing fence 10 partially broken, and FIG. 2 is a plan view thereof.
The shock absorbing fence 10 according to the present invention includes a plurality of support columns 20 erected at predetermined intervals, a protection loop 30 wound around these support columns 20, 20, and near the end of the protection loop 30. And a friction resistance type shock absorber 40 holding the
[0008]
<B> The column 20 is, for example, a steel pipe, a concrete-filled steel tube, a concrete column, an elastic column, and various known materials can be applied.
The cross-sectional shape of the support column 20 is not particularly limited. However, in the shock absorbing fence of this example as will be described later, the protective loop 30 slides while contacting the side surface of the support column 20 at the time of impact. The planned surface may be formed as a round arc surface.
In order to prevent the protective loop 30 from slipping down, a protrusion or a depression is provided on the side surface of the support column 20.
The lower part of the support column 20 may be supported on the ground or a concrete foundation so as not to be tilted, but may be supported so as to be tilted by adopting a hinge structure.
Although not shown in the drawing, various holding ropes are disposed obliquely between the upper portion of the support column 20 and the slope side. In this case, it is desirable to place a frictional resistance type shock absorber at the end or middle of the holding rope.
[0009]
<C> Protective loop The protective loop 30 is a rope material such as a PC steel wire having excellent tensile strength and a steel wire from PC, and the overlapping portion near both ends of the rope material is gripped by the buffer 40 and formed into a loop shape. In addition, the extra length portions 31 and 31 are formed in ranges beyond the gripping position of the shock absorber 40, respectively.
A stopper 32 is provided at the end of the rope material to restrict the escape from the shock absorber 40. The sliding (slip) distance of the multiple ropes 30 is determined by the set length of the extra length portions 31 and 31.
The length of the rope material constituting the protective loop 30 has a length that can be wound around the support columns 20, 20. In other words, the length of the upright interval of the support columns 20 including the winding length around each support column 20, 20 is as follows. The length is set to a length that can secure the extra length portions 31 and 31 having a predetermined length when wound between the support columns 20 and 20 with a length of twice or more.
[0010]
The protective loop 30 is wound so that there is no slack in the horizontal direction between the adjacent struts 20, 20 and the protective loop 30 can slide on the side surface of the strut 20 at the time of impact.
If the same level of shock absorption performance as that of a conventional fence with a single rope member placed horizontally between struts is secured, the rope members constituting the protective rope 30 are arranged in multiple layers, and the force is limited within the loop formation range. Therefore, the diameter of the rope material constituting the protective loop 30 can be designed to be small.
When there are three or more struts 20, the protection loops 30 and 30 are wound around each strut 20 located between the terminal struts from both directions except for the struts of the terminal.
The protection loops 30 are chain-wrapped and horizontally mounted so that each support column 20 has a shared relationship with the left and right protection loops 30 and 30.
The vertical interval of the protection loop 30 is selected and determined as appropriate so that the transmission of falling rocks, avalanches and the like can be regulated.
[0011]
<D> Shock absorber The shock absorber 40 grips the overlapping portion of the protective loop 30 and allows the rope material to slide and impact when the tensile force acting on the protective loop 30 exceeds the frictional resistance force of the gripping portion. An instrument that attenuates force.
As the shock absorber 40, for example, a friction resistance type shock absorber comprising a plurality of plate members that can grip the overlapping portion of the protective loop 30 and bolts that can be fastened between these plate materials can be used. A known instrument or device having an action can be used.
[0012]
In the present invention, a single shock absorber 40 is mounted on the protective loop 30 that is wound around the support column 20, and therefore, the shock absorber e is provided on both sides of the support column f and the support column f as shown in FIGS. The number of shock absorbers 40 used can be reduced compared to the shock absorbing fence.
[0013]
[Action]
Next, the impact absorbing action when various impact forces F act on the impact absorbing fence 10 from the upper side to the lower side in FIG. 2 will be described.
[0014]
The impact force F acting on the front surface of the protective loop 30 (the side on which the shock absorber 40 is not provided) is transmitted to the back surface of the protective loop 30 (the side on which the shock absorber 40 is provided) through the winding portion around the support column 20. Acts as a uniform tensile force over the entire length of the 30 loops.
As long as the tensile force does not exceed the gripping force of the shock absorber 40 of the protective loop 30, the rope material does not slide, and therefore the loop length of the protective loop 30 does not change.
[0015]
Since the adjacent protection loops 30 and 30 can transmit force via the support column 20, the impact force F is transmitted to the protection loop 30 or the support column 20 at a portion where the impact force F does not act directly, and a plurality of protection loops 30. And a plurality of support columns 20 are distributed and supported.
[0016]
When the impact force F exceeds the gripping force of the shock absorber 40, it slides (slips) between the rope material constituting the protective loop 30 and the shock absorber 40, and the impact force F is effectively reduced by the frictional resistance during sliding. Attenuates.
Along with the start of sliding between the rope member and the shock absorber 40, the loop length of the protective loop 30 becomes longer, and sliding also occurs at the winding portion between the protective loop 30 and the side surface of the support column 20. The damping action of the impact force F proceeds also by the frictional resistance of the winding portion.
The two damping (buffering) actions of the protective loop 30 described above are possible until the surplus length portions 31, 31 are shortened and the stopper 32 abuts against the buffer 40.
[0017]
Further, as will be described later, the shock absorbing fence 10 according to the present invention requires only a small amount of protrusion of the protective loop 30 to the side.
[0018]
Fig. 3 shows a model diagram of a single type of shock absorbing fence for comparison, in which one end is fixed to each column, rope material is arranged, and the center of the overlapping portion of both rope materials is held by a shock absorber (not shown). (A) of the figure shows the state before the impact, and (B) at the same time shows the state after the impact. When the distance L between the struts is 6 m, for example, and the distance l of the extra length of the rope material is 0.5 m, the protruding amount Δy ₁ of the rope material after receiving is 1.25 m.
[0019]
FIG. 4 shows a model diagram of the shock absorbing fence according to the present invention in which a protective loop is spanned between the columns. FIG. 4A shows a state before the impact, and FIG. Shows the state after the shot.
When the distance L between the struts is 6 m, for example, and the distance l of the extra length of the rope material is 0.5 m, the protruding amount Δy ₂ of the rope material after receiving is 0.875 m. However, the length of the winding part of the protective loop was ignored to simplify the calculation.
[0020]
Thus, the protruding amount of the rope member when the sliding amount (energy absorption amount) is the same is smaller in the protective loop 30 as in the present invention, which is advantageous when the shock absorbing fence 10 is installed on the road or the like. is there.
In addition, the shock absorbing fence 10 according to the present invention not only reduces the diameter of the rope material but also excels in terms of shear strength compared to the single type.
[0021]
Second Embodiment of the Invention
Other embodiments will be described below. In the description, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0022]
FIG. 5 shows another embodiment in which a protective loop 30 is arranged in a shape of a plane eight between the support pillars 20 and 20 and wound around.
In this example, the winding angle (winding length) of the protection loop 30 with respect to the support column 20 is longer than in the first embodiment, so that the sliding resistance at the time of impact is increased and the shock absorbing performance is improved. it can.
[0023]
Further, as shown in FIG. 6, when the protective loop 30 is wound around the support column 20 once or a plurality of times, the sliding resistance between the protective loop 30 and the support column 20 is increased, and the shock absorbing performance can be further enhanced.
[0024]
Embodiment 3 of the Invention
FIG. 7 shows another embodiment using a protective loop 30 having a length that allows the rope material to be wound twice or more at the same height between the support columns 20 and 20.
[0025]
FIG. 8 shows another embodiment in which the rope material constituting the protective loop 30 is wound in a zigzag manner twice or more along the longitudinal direction of the support columns 20.
[0026]
In the shock absorbing fence shown in FIGS. 7 and 8, the point that the end portion of the protective loop 30 is gripped by the shock absorber 40 and the extra length portions 31 and 31 are formed are the same as in the above-described embodiment. .
[0027]
In this example, the dispersibility of the impact force is improved by the increase in the number of times the protective loop 30 is wound.
[0028]
Embodiment 4 of the Invention
FIG. 9 shows another embodiment in which a longitudinal connecting line 50 is additionally attached so as to cross the protective loops 30, 30.
The vertical connection cable 50 may be arranged and formed in a lattice shape only on one side serving as the receiving surface of the shock absorbing fence.
[0029]
For example, a chain or a rope material can be used for the vertical connection cable 50.
When a chain is used for the longitudinal connection cable 50, the protective loops 30 are inserted through the single rings constituting the chain, and the chain is used as an opening preventing member for the protective loops 30, 30.
When a rope member is used for the longitudinal connecting line 50, if a friction resistance type shock absorber (not shown) is attached to the intersection of the longitudinal connecting line 50 and each protective loop 30, 30,. In addition to preventing the opening of 30 ..., it can also exhibit a buffering action by frictional sliding at the intersection, thereby providing a high-performance shock absorbing fence.
[0030]
Embodiment 5 of the Invention
FIG. 10 shows another embodiment in which protrusions 21 for winding are provided in multiple stages on one side of the support columns 20 and 20 and a protective loop 30 is wound between the adjacent protrusions 21 and 21. .
In this example, a case where one protective loop 30 is wound around one protrusion 21 is shown, but the left and right protective loops 30, 30 of the support column 20 are wound around one protrusion 21 together to share the protrusion 21. You may do it.
[0031]
Further, it is desirable to arrange the protection loop 30 on the side facing the receiving direction of the support column 20 or to bulge the tip of the protrusion 21 so that the protection loop 30 does not come off during the receiving.
[0032]
Embodiment 6 of the Invention
Although the above description has been given of the case where the overlapping portions near both ends of the rope material are gripped by the shock absorber 40 and the extra length portions 31 are formed on both rope materials, respectively, one end of the rope material is not slid on the shock absorber 40. In addition to fixing in a moving state, there may be a case where only one extra length portion 31 is formed by gripping the vicinity of the end of the other end of the rope member by the buffer 40.
[0033]
【The invention's effect】
The present invention can obtain the following effects.
<A> Since a protective loop having a buffering function is wound between the support columns, the dispersibility of the impact force and the shear strength can be improved, and an impact absorbing fence with high impact absorbing performance can be provided.
<B> Since the amount of overhang of the protective loop can be reduced as compared with a fence on which a planar protective net is arranged, it is advantageous when installed on a site where the amount of overhang is limited, such as on the road.
<C> Since the number of shock absorbers used is small, the time, labor and economic burden required for construction of the fence can be greatly reduced.
<D> Since the impact force dispersion performance increases in proportion to the number of times the protective loop is wound, the impact absorption performance of the entire fence can be dramatically improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of an impact absorbing fence according to Embodiment 1 of the present invention. FIG. 2 is a plan view thereof. FIG. 3 is a model diagram for explaining an amount of rope material of a contrast fence. FIG. 4A is a model diagram for explaining the extension amount of the protection loop according to the present invention, and FIG. 4A is a model before the impact. Model diagram of (B) after the impact [Fig. 5] Explanatory diagram of another protection loop wrapping rope material around the strut 8 o'clock [Fig. 6] Rope material strut Fig. 7 is an explanatory diagram of the other protective loops wound around the pole. Fig. 7 is an explanatory diagram of the other protective loops wrapped around the struts. Fig. 8 is a rope member between the struts. Explanatory drawing of the winding form of other protective loops wound in a zigzag shape. [Fig. 9] A net with connecting ropes crossing the protective loops. FIG. 10 is an explanatory view according to another embodiment in which a protection loop is horizontally mounted on one side of a support column, and (A) is partially omitted. A plan view of the shock absorbing fence, (B) is a front view with a part omitted. [FIG. 11] An explanatory diagram of the protective net assumed by the present invention. [FIG. 12] An explanatory diagram of the shock absorbing fence assumed by the present invention. FIG. 13 is an explanatory diagram of another shock absorbing fence assumed by the present invention.
10 Shock Absorbing Fence 20 Post 30 Protective Loop 31 Extra Length 32 Stopper 40 Buffer 50 Longitudinal Connecting Rope

Claims (4)

Struts erected at a predetermined interval;
Becomes more and more protection loop with a cushioning function of both ends near the wound possible length of the rope material into a loop and gripped by bumper between said post,
The protective loop is wound in a loop shape between the support columns and is horizontally mounted in a multistage manner ,
Shock absorbing fence. A plurality of support columns standing at predetermined intervals;
Both ends near the loop allows wound length of rope material between struts adjacent, more becomes more protective loops formed by gripping with bumper leaving extra length portion,
It is characterized in that a protective loop is wrapped around in a loop between adjacent struts while sharing the struts, and is laid in a chain .
Shock absorbing fence. The shock absorbing fence according to claim 1 or 2, wherein the protective loop has a rope length that can be wound around the support column in a loop shape a plurality of times. Near both ends of the rope material wrapping possible length in a loop between the mounting posts erected at a predetermined interval, and gripped by bumper to form a protective loop to form the elongated portion,
It is characterized by absorbing shock by the buffering action of the protective loop that is wound around in a loop between the support columns and the sliding resistance of the protection loop and the support columns,
Shock absorption method.

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