JP6925674B1 - Mounting structure of shock absorber for guard fence and horizontal rope and shock absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shock absorber for a guard fence and a mounting structure of the horizontal rope and the buffer device capable of exerting a stable buffering action while eliminating the protrusion of an extra length portion of the horizontal rope toward the outside of the guard fence. SOLUTION: A friction sliding type shock absorber 40 in which an insertion hole 42 having a diameter difference and a gripping hole 43 are arranged side by side, an inversion guide body 50 for reversing an extra length portion 22 of a horizontal rope 20, and a shock absorber 40. A shock absorber 30 provided with a reverse spacer 60 located between the reverse guide body 50 is moored on the inner side surface of the support column 10, and the extra length 20 of the horizontal rope 20 inverted in the shock absorber 30 is used as the shock absorber 40. The extra length portion 22 of the horizontal rope 20 can be routed toward the inside of the guard fence while being gripped by. [Selection diagram] Fig. 2

Description

The present invention relates to a protective fence that catches falling objects such as rockfalls, landslides, and avalanches. Regarding the mounting structure of the horizontal rope and the shock absorber.

It is well known that a protective fence that catches a falling object while attenuating the impact by the impact absorbing action of the shock absorbing devices provided at both ends of the horizontal rope constituting the protective net.
As a shock absorber, a friction sliding type shock absorber is widely known.
This shock absorber includes a plurality of holding plates and a plurality of tightening bolts for tightening the holding plates, and tightens a single or a plurality of horizontal ropes arranged between the holding plates with the tightening bolts. When a tension exceeding the frictional resistance generated between the holding plate and the horizontal rope acts on the horizontal rope, the horizontal rope slips and absorbs impact energy.

As a form of attaching the shock absorber, a form in which the shock absorber is fixedly attached to each support column body (Patent Document 1) and a form in which the shock absorber is moored and attached to the side surface of each support column body via a U bolt are known. (Patent Document 2).

Regardless of the mounting form, shock absorbers are provided on the left and right sides of each horizontal rope so as to transmit the load acting on a part of the horizontal ropes to the shock absorbers on both the left and right sides.
When the horizontal rope is gripped by the shock absorber, a rope having a preset slip length is used as an extra length portion and extends from the shock absorber in the extension direction of the horizontal rope.

Patent Document 3 discloses a mode in which a shock absorber is installed on a part of a horizontal rope at a place other than a support column. In this case, the middle of the horizontal ropes laid horizontally on the adjacent columns is polymerized, and a shock absorber capable of gripping the overlapping portion of the horizontal ropes is installed.

Japanese Unexamined Patent Publication No. 6-57712 Japanese Unexamined Patent Publication No. 2002-180422 JP-A-2019-60104

The conventional shock absorber has the following problems.
<1> The extra length of the horizontal rope extending from the shock absorber is left protruding outside the guard fence.
When viewed from the entire guard fence, the extra lengths of many horizontal ropes protrude outside the fence body, which not only deteriorates the landscape but also obstructs the passage of climbers and the like.
<2> When a shock absorber is installed in the overlapping portion of the horizontal rope, when the horizontal rope slips, the shock absorber is dragged in the direction of action of the load and moves laterally.
When the shock absorber moves laterally, it interferes with net materials such as wire mesh attached to the lateral rope and damages the protective net.
<3> For the work of stretching a horizontal rope between columns, a separate reaction force source (for example, a reaction force pile or anchor) is provided on the outside of the guard fence, and a chain block or a chain block is provided between the reaction force source and the horizontal rope. The horizontal rope is tense by hanging a winder such as a lever hoist.
As described above, conventionally, a robust reaction force source installation work is required prior to the tension work of the horizontal rope, and it takes a lot of time and labor to install the reaction force source, resulting in poor workability.

The present invention has been made to solve the above problems, and the purpose of the present invention is to exhibit a stable buffering action while eliminating the protrusion of the extra length of the horizontal rope toward the outside of the guard fence. It is an object of the present invention to provide a buffer device for a guard rail and a mounting structure for a horizontal rope and a buffer device.

The present invention includes a plurality of columns erected at predetermined intervals and a protective net stretched between the plurality of columns, and the protective net is a single or a plurality of columns stretched between adjacent columns. A shock absorber for a protective fence in which a shock absorber is interposed between a horizontal rope and at least one end of the horizontal rope and a support column, and an insertion hole and a gripping hole having a diameter difference are arranged side by side to form the horizontal rope. It is configured to include a single or a plurality of shock absorbers capable of gripping the extra length portion by a gripping hole, and a reversing guide body having a curved guide surface and mooring the extra length portion by reversing the extra length portion.
In another embodiment of the present invention, the shock absorber is further provided with an inversion spacer located between the shock absorber and the inversion guide body to keep the distance between the shock absorber and the inversion guide body constant, and the inversion spacer is provided. A shock absorber is located on one side surface, and an inversion guide body is located on the other side surface of the reversing spacer, and the extra length of the horizontal rope extending from the shock absorber can be routed toward the inside of the guard fence. As described above, the extra length portion of the horizontal rope wound around the reversing guide body and inverted can be inserted into the insertion hole and the gripping hole of the shock absorber.
In another embodiment of the present invention, the hole diameter of the gripping hole of the shock absorber that is wound around the reversing guide body and grips the extra length portion of the inverted horizontal rope has a dimensional relationship smaller than that of the insertion hole.
In another embodiment of the present invention, the diameter of the gripping hole of the shock absorber is smaller than the rope diameter of the horizontal rope.
In another embodiment of the present invention, the hole diameter of the insertion hole of the shock absorber has a dimensional relationship of substantially the same diameter as the rope diameter of the horizontal rope.
In another embodiment of the present invention, the shock absorber has a pair of holding plates having the same structure and a tightening means for uniformly tightening between the pair of holding plates, and the insertion holes are formed on the facing surfaces of the pair of holding plates. It has two accommodating grooves having a semicircular cross section for defining the gripping holes.
In another embodiment of the present invention, a trumpet-shaped enlarged diameter portion is formed at both ends of the insertion hole and the gripping hole of the shock absorber.
In another embodiment of the present invention, a plurality of shock absorbers may be arranged in parallel on one side surface of the inversion spacer.
In another embodiment of the present invention, the inversion guide body exhibits a separate structure or an integral structure with respect to the inversion spacer.
Further, the present invention includes a plurality of columns erected at predetermined intervals and a protective net stretched between the plurality of columns, and the protective net may be a single or a plurality of columns stretched between adjacent columns. A structure for attaching the horizontal rope and the shock absorber in a guard rail, which has the horizontal rope of the above and a shock absorber interposed between at least one end of the horizontal rope and a support column, and any one of the above-mentioned shock absorbers. The extra length of the horizontal rope moored to the support, wrapped around the reversing guide body of the shock absorber, and inverted is grasped by the gripping hole of the shock absorber to protect the extra length of the horizontal rope extending from the shock absorber. The rope is arranged toward the inside of the fence, and when the tension of the lateral rope exceeds the gripping force of the extra length portion by the shock absorber, a slip occurs between the extra length portion and the grip hole.
In another embodiment of the present invention, the reversing guide is connected to the strut and the shock absorber is moored to the inner side surface of the strut.
In another embodiment of the present invention, due to the difference in diameter between the insertion hole and the gripping hole of the shock absorber through which the extra length portion of the horizontal rope wound and inverted around the reversing guide body is inserted, the shock absorber moves in the direction of the support column when the horizontal rope slips. Be urged to.

The present invention has the following effects.
<1> By using a shock absorber having a function of reversing the extra length of the horizontal rope, the extra length of the horizontal rope extending from the shock absorber can be routed toward the inside of the guard fence, and from the guard fence. It is possible to prevent the extra length of the rope from sticking out.
Therefore, the extra length of the horizontal rope is hidden inside the guard fence, which not only improves the scenery of the guard fence, but also enhances the safety of the guard fence without obstructing the passage of climbers and the like.
<2> Since the shock absorber has a structure in which a shock absorber having a simple structure, a reversing guide body, etc. are arranged side by side, not only can the shock absorber be manufactured at low cost, but also the assembly work of the shock absorber can be easily performed on site. ..
<3> Since the extra length of the horizontal rope can be routed toward the inside of the guard fence, a winder can be used between the horizontal rope body separated from the shock absorber and the extra length routed inside the guard fence. Can be hung, and a reaction force can be obtained from the support and the horizontal rope to pull the extra length.
Therefore, it is not necessary to provide a separate reaction force source (for example, a reaction force pile, an anchor, etc.) on the outside of the guard fence, and it is possible to simplify and improve the efficiency of the tension work of the horizontal rope.
<4> When the horizontal rope slips, the shock absorber abuts against the reversing spacer to prevent the shock absorber from moving laterally.
Therefore, the problem of damage to the protective net caused by the lateral movement of the shock absorber can be solved.

Perspective view of the mounting structure of the shock absorber according to the present invention in which a part is omitted. Central longitudinal section of shock absorber Exploded view of shock absorber In the explanatory view of the shock absorber, (A) is a central vertical cross-sectional view of the shock absorber, and (B) is a cross-sectional view of BB of (A). An explanatory diagram of the tension work of the horizontal rope using the shock absorber, (A) is an explanatory diagram of the mountain stream work to the support of the shock absorber, and (B) is an explanatory diagram of the tension work of the extra length part of the horizontal rope. Explanatory drawing of buffer action of buffer device Explanatory drawing of the shock absorber according to another Example in which a plurality of shock absorbers were arranged in parallel.

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

<1> Outline of Protective Fence The protective fence presupposed by the present invention includes a plurality of columns 10 erected at predetermined intervals and a protective net stretched between the plurality of columns 10.
The protective net includes a single or a plurality of horizontal ropes 20 stretched between adjacent columns 10, and a shock absorber 30 interposed between at least one end of the horizontal ropes 20 and the columns 10.
The main materials will be described in detail below.

<2> Strut The strut 10 shown in FIG. 1 indicates a terminal strut or an intermediate strut.
A mooring hook 11 for mooring the shock absorber 30 is provided so as to project from a part of the outer peripheral surface of the support column 10.
In the case of a terminal strut, shock absorbers 30 are provided on one side of the strut 10 on the left and right, and in the case of an intermediate strut, shock absorbers 30 are moored on both the left and right sides of the strut 10.

Any one of known steel materials such as shaped steel and steel pipes, concrete columns, and filled steel pipes obtained by combining steel pipes and concrete can be applied to the columns 10.
The erection form of the stanchion 10 may be erected so as to be tiltable, or the lower portion of the stanchion 10 may be embedded in a concrete foundation, the local ground, or the like so as to be erected so as not to be tilted.
The tilting support column 10 may have a hinge structure that allows tilting along the tilting direction of the slope, in addition to an upright structure that allows tilting in all directions.

<3> Horizontal rope The horizontal rope 20 is one of the constituent members of the protective net, and is a known wire rope that can be laid between adjacent columns 10 in units of spans of the columns 10 or over a plurality of spans.
The total length of the horizontal rope 20 has a length obtained by adding the length of the extra length portion 22 to the horizontal length between the adjacent columns 10.

In the present invention, the "extra length portion 22" of the horizontal rope 20 refers to the range of the slipperable length of the horizontal rope 20 extending from the shock absorber 40 described later.

The horizontal rope 20 includes a plurality of intermediate horizontal ropes arranged in multiple stages between adjacent columns 10 at predetermined intervals, and two end horizontal ropes arranged only on the upper side and the lower side of the protective net. Includes combinations.
The protective net includes a known blocking surface with a plurality of lateral ropes 20.
The protective net also includes a form in which a wire mesh is integrally attached to one side of a plurality of horizontal ropes 30.

<4> Shock absorber The shock absorber 30 is provided at one end or both ends of the horizontal rope 20.
The shock absorber 30 has a reversing function of folding back the extra length portion 22 of the lateral rope 20 and a damping function of slipping the extra length portion 22 of the lateral rope 20 to attenuate the tension when a certain amount of tension is applied to the extra length portion 22.

The shock absorber 30 illustrated in FIGS. 2 to 4 will be described.
The shock absorber 30 is a friction-sliding shock absorber 40, a reversing guide body 50 for mooring and reversing the extra length portion 22 of the horizontal rope 20, and a reversing guide body 50 for keeping the distance between the shock absorber 40 and the reversing guide body 50 constant. A spacer 60 is provided.
The shock absorber 40 is located on one side surface of the reversing spacer 60, and the reversing guide body 50 is located on the other side surface of the reversing spacer 60.
In this example, the form in which the inversion guide body 50 and the inversion spacer 60 are formed separately will be described, but these members may be integrally formed.
The inversion spacer 60 is not essential and may be omitted.

<4.1> Buffers This will be described with reference to FIGS. 3 and 4. The shock absorber 40 has a pair of holding plates 41, 41 having the same structure and a tightening means for uniformly tightening between the pair of holding plates 41, 41.
The facing surfaces of the pair of holding plates 41, 41 have a first accommodating groove 42a and a second accommodating groove 43a having a semicircular cross section at intervals, and the facing surfaces of the pair of holding plates 41, 41 are in contact with each other. As a result, the pair of first accommodating grooves 42a face each other to form an insertion hole 42 having a circular cross section, and the pair of second accommodating grooves 43a face each other to form a gripping hole 43 having a circular cross section.

The insertion hole 42 and the gripping hole 43 may have a uniform diameter over the entire length, but when the diameter-expanded portions 42b and 43b having a trumpet-like diameter are formed at both ends of both holes 42 and 43, the horizontal rope 20 is arranged. And the extra length portion 22 of the horizontal rope 20 can be smoothly slipped.

<4.1.1> Dimensional relationship between the insertion hole and the grip hole The hole diameters of the insertion hole 42 and the grip hole 43 are not the same but have a diameter difference.
The diameter difference between the holes 42 and 43 is provided so that the shock absorber 40 can be urged in the approaching direction of the support column 10 (or the reversing spacer 60) by utilizing the tension acting on the lateral rope 20. This is to control the moving direction of 40.
Specifically, the hole diameter d ₂ of the gripping hole 43 has a dimensional relationship that is relatively small with respect to the _{hole diameter d 1} of the insertion hole 42.
More specifically, the hole diameter d _{1 of the insertion hole 42 has a larger diameter than the hole diameter d 2} of the gripping hole 43, and has a dimensional relationship equal to or larger than _{the rope diameter d 3} of the horizontal rope 20.
Hole diameter _{d 2} of the grip hole 43, hole diameter _{d 1} of the insertion hole 42 and in the rope diameter _{d 3} smaller dimensions relationship.

That is, the dimensional relationship of each member is as follows.
Hole diameter of gripping hole 43 d ₂ <Hole diameter of insertion hole 42 d ₁ = Rope diameter of horizontal rope 20 d ₃

For example, when a horizontal rope 20 having a rope diameter d ₃ of 18 mm is used, the hole diameter d ₁ of the insertion hole 42 is 18 mm, and the hole diameter d ₂ of the gripping hole 43 is 16 mm.

Further, if necessary, the _{hole diameter d 1} of the insertion hole 42 may have a dimensional relationship slightly smaller than the rope diameter d ₃ while maintaining a relationship of a diameter larger than the _{hole diameter d 2 of the grip hole 43 (grip hole).} Hole diameter d _{2 of} 43 <hole diameter d ₁ of insertion hole 42 <rope diameter d ₃ of horizontal rope 20).

In the present invention, the lateral rope 20 is guided by the insertion hole 42, the folded extra length portion 22 is slipperably gripped by the grip hole 43 having the smallest diameter, and the tension acting on the extra length portion 22 is the grip of the grip hole 43. The extra length portion 22 is configured to start slipping when the force is exceeded.
A difference in diameter is provided between the insertion hole 42 and the gripping hole 43 of the shock absorber 40, and the folded extra length portion 22 is gripped by the gripping hole 43 having the smallest diameter, which stabilizes the tension acting on the lateral rope 20. This is because it attenuates.

<4.1.2> Tightening means As the tightening means, for example, a combination of a plurality of tightening bolts 44 and nuts 45, a vise type tightening tool, or the like can be used.
The tightening means may be any one that can tighten between the pair of holding plates 41, 41 with an equal force.
When a plurality of tightening bolts 44 are used as the tightening means, bolt holes are provided at positions that do not interfere with the insertion holes 42 and the gripping holes 43.

<4.2> Inversion spacer A description will be given with reference to FIGS. 1 to 3. The reversing spacer 60 is a space-holding material that keeps the distance between the shock absorber 40 and the reversing guide body 50 constant.
One of the left and right sides of the reversing spacer 60 can be in contact with the side surface of the shock absorber 40, and the other left and right sides can be in contact with the reversing guide body 50.

In this example, two bearing plates 61 having a substantially trapezoidal shape, a reinforcing member 62 interposed between the two bearing plates 61, and a mounting bolt 63 for integrally fixing the two bearing plates 61 are provided. The form will be described.
The reversing spacer 60 may have any structure as long as the separation distance between the reversing guide body 50 and the shock absorber 40 can be kept constant without hindering the folding back of the extra length portion 22 of the lateral rope 20 extending from the shock absorber 40.

<4.3> Reversing guide body The reversing guide body 50 has a guide surface 51 curved in an arc shape for folding back the extra length portion 22 of the horizontal rope 20 extending from the shock absorber 40.
In this example, a form in which the reversing guide body 50 is composed of a sheave-shaped ring body will be described, but the reversing guide body 50 is not limited to the ring body, and the guide surface 51 curved in an arc shape for folding back the extra length portion 22. Any structure may be used.
When the reversing guide body 50 is composed of a ring body, the ring body may be in either a rotatable or non-rotatable form with respect to the reversing spacer 60.
The reversing guide body 50 is moored to the mooring hook 11 of the support column 10 via a connecting jig 52 such as a shackle.

[Tension work of horizontal rope]
The tensioning work of the horizontal rope 20 will be described with reference to FIG.

<1> Mooring of shock absorber (Fig. 5 (A))
The reversing guide body 50 is moored and installed on the inner side surface of the support column 10 (inside the support column 10 span) via the connector 52.
The right side of the horizontal rope 20 is fixed to a separate support.
The left side of the horizontal rope 20 is wound around the guide surface 51 of the reversing guide body 50 and turned over.
In parallel with the reversing work of the horizontal rope 20, the reversing spacer 60 is arranged on the side of the reversing guide body 50, and the shock absorber 40 is arranged on the side of the reversing spacer 60.
When the horizontal rope 20 is inverted, the shock absorber 40 is temporarily assembled, and the horizontal rope main body 21 of the horizontal rope 20 and the folded extra length portion 22 are slidably inserted into the shock absorber 40.

<2> Tension work of the horizontal rope (Fig. 5 (B))
A winder 70 such as a chain block or a lever hoist is hung between the horizontal rope main body 21 separated from the shock absorber 30 and the extra length portion 22 which is folded back and extends from the shock absorber 30, and the support column 10 and the horizontal rope 20 are hung. The reaction force is obtained to pull the extra length portion 22.
In order for the winder 70 to connect to the horizontal rope main body 21 and the extra length portion 22, for example, a known detachable rope grip 71 is used for connecting.
With the horizontal rope 20 tense, the shock absorber 40 is fully tightened so that the extra length portion 22 does not return, and the winder 70 is removed.

In the present invention, the lateral rope 20 can be stretched between the adjacent columns 10 without slack by obtaining a reaction force from the column 10 and the lateral rope 20 and pulling the extra length portion 22.
Therefore, unlike the conventional tension method, it is not necessary to provide a separate reaction force source on the outside of the support column 10, and the horizontal rope 20 can be easily stretched between the support columns 10, and the workability of the horizontal rope 20 can be stretched. Can be improved.

<3> Arrangement form of extra length (Fig. 6)
In the conventional guard fence, the extra length of the horizontal rope extending through the shock absorber is laid out so as to protrude outside the guard fence.

On the other hand, in the guard fence of the present invention, the extra length portion 22 near the end of the horizontal rope 20 can be folded back by the shock absorber 30 and routed toward the inside of the guard fence.
In other words, the folded extra length portion 22 of the horizontal rope 20 is hidden inside the guard fence, and the extra length portion 22 does not have to protrude outside the guard fence.
Therefore, not only the scenery of the guard fence is improved, but also the safety of the guard fence is improved without obstructing the passage of climbers and the like.

[Buffer action of buffer device]
The buffering action of the buffering device 30 will be described with reference to FIG.

<1> Before the reception In the shock absorber 30 before the reception, the extra length portion 22 of the horizontal rope 20 wound around the reversing ring body 50 inserts both holes 42 and 43 of the shock absorber 40, and the grip hole having the smallest diameter. 43 holds the end side of the extra length portion 22 so as not to slide.
The tension introduced into the lateral rope 20 is supported by the column 10 through the shock absorber 30, the connector 52 and the mooring hook 11.

<2> When receiving an impact When an impact acts on the protective net, the tension of the horizontal rope 20 increases.
The tension of the lateral rope 20 is transmitted to the grip portion of the grip hole 43 of the shock absorber 40 constituting the shock absorber 30 through the extra length portion 22.

When the tension of the lateral rope 20 is smaller than the gripping force of the extra length portion 22 by the shock absorber 40, the extra length portion 22 does not slip.

When the tension of the horizontal rope 20 exceeds the gripping force of the extra length portion 22 by the shock absorber 40, a slip occurs between the extra length portion 22 and the gripping hole 43, and the extra length portion 22 is pulled out to lay the horizontal rope 20 horizontally. The length becomes longer.
The shock absorber 40 can attenuate the tension of the lateral rope 20 due to the sliding resistance when the extra length portion 22 is pulled out.

In the present invention, the extra length portion 22 of the horizontal rope 20 is folded back, and the side of the folded extra length portion 22 near the end is gripped by the gripping hole 43. Therefore, the extra length portion 22 is compared with the conventional shock absorber. The stability of slip tension (sliding resistance) is significantly improved.

Further, since the sliding direction of the extra length portion 22 coincides with the direction in which the shock absorber 40 is pressed against the reversing guide body 50, the shock absorber 40 does not move laterally even if the extra length portion 22 slides.
Therefore, it is possible to prevent the shock absorber 40 from interfering with the net material such as the wire mesh constituting the protective net and damaging the protective net.

[Other Examples]
The shock absorber 30 according to the previous embodiment has described a form in which a single shock absorber 40 is arranged on the side surface of the reversing guide body 50.
As shown in FIG. 7, a plurality of shock absorbers 40 having the same structure may be arranged on the side surface of the reversing guide body 50.
The form of gripping the extra length portion 22 by each shock absorber 40 is the same as that of the previous embodiment.
The side surfaces of the plurality of adjacent shock absorbers 40 are in contact with each other so as to be able to transmit a load.

When the shock absorber 30 is provided with the plurality of shock absorbers 40 as in this example, the gripping area of the extra length portion 22 is increased, so that the slip tension (sliding resistance) of the lateral rope 20 is increased.

10 ... Support 11 ... Mooring hook 20 ... Horizontal rope 21 ... Horizontal rope body 22 ... Extra length of horizontal rope 30 ... Shock absorber 40 ...・ Buffer 41 ・ ・ ・ ・ Holding plate 42a ・ ・ ・ First accommodating groove 42b ・ ・ ・ Expanded diameter 42 ・ ・ ・ ・ Insertion hole 43a ・ ・ ・ Second accommodating groove 43b ・ ・ ・ Enlarged diameter 43 ・ ・・ ・ Gripping hole 44 ・ ・ ・ ・ Tightening bolt 45 ・ ・ ・ ・ Nut 50 ・ ・ ・ ・ Reversing guide body 51 ・ ・ ・ ・ Guide surface 60 ・ ・ ・ ・ Reversing spacer 61 ・ ・ ・ ・ Support plate 62 ・ ・・ ・ Reinforcing material 63 ・ ・ ・ ・ Mounting bolt

Claims (12)

A plurality of columns erected at predetermined intervals and a protective net stretched between the plurality of columns are provided, and the protective net includes a single or a plurality of horizontal ropes stretched between adjacent columns. A shock absorber for a protective fence in which a shock absorber is interposed between at least one end of the horizontal rope and a support column.
An insertion hole having a diameter difference and a gripping hole are arranged side by side, and a single or a plurality of shock absorbers capable of gripping the extra length portion of the horizontal rope with the gripping hole.
It has a curved guide surface, and is provided with a reversing guide body that is moored by reversing the extra length portion of the horizontal rope.
A shock absorber for guard rails. A reversing spacer is provided between the shock absorber and the reversing guide body to keep the distance between the shock absorber and the reversing guide body constant, and the shock absorber is located on one side surface of the reversing spacer.
The reversing guide body is located on the other side surface of the reversing spacer, and is wrapped around the reversing guide body so that the extra length portion of the horizontal rope extending from the shock absorber can be routed toward the inside of the guard fence. The shock absorber for a guard fence according to claim 1, wherein the extra length portion of the crossed rope is configured to be inserted into the insertion hole and the grip hole of the shock absorber. The first or second aspect of the present invention, wherein the hole diameter of the gripping hole of the shock absorber that is wound around the reversing guide body and grips the extra length portion of the inverted horizontal rope has a dimensional relationship smaller than that of the insertion hole. A shock absorber for guard rails. The shock absorber for a guard rail according to any one of claims 1 to 3, wherein the hole diameter of the gripping hole of the shock absorber has a dimensional relationship smaller than the rope diameter of the horizontal rope. The shock absorber for a guard fence according to any one of claims 1 to 4, wherein the hole diameter of the insertion hole of the shock absorber has a dimensional relationship substantially the same as the rope diameter of the horizontal rope. The shock absorber has a pair of holding plates having the same structure and a tightening means for uniformly tightening between the pair of holding plates, and for defining the insertion hole and the gripping hole on the facing surfaces of the pair of holding plates. The shock absorber for a guard rail according to any one of claims 1 to 5, further comprising two accommodating grooves having a semicircular cross section. The shock absorber for a guard rail according to any one of claims 1 to 6, wherein a trumpet-shaped enlarged diameter portion is formed at both ends of the insertion hole and the gripping hole of the shock absorber. .. The shock absorber for a guard rail according to claim 2 , wherein a plurality of shock absorbers are arranged in parallel on one side surface of the reversing spacer. The shock absorber for a guard rail according to claim 2, wherein the reversing guide body exhibits a separate structure or an integral structure with respect to the reversing spacer. A plurality of columns erected at predetermined intervals and a protective net stretched between the plurality of columns are provided, and the protective net includes a single or a plurality of horizontal ropes stretched between adjacent columns. It is a mounting structure of the horizontal rope and the shock absorber in the guard fence, which has at least one end of the horizontal rope and a shock absorber interposed between the columns.
The shock absorber according to any one of claims 1 to 9 is moored to a support column.
The extra length of the horizontal rope wound around the reversing guide body of the shock absorber and flipped is gripped by the gripping hole of the shock absorber.
Arrange the extra length of the horizontal rope extending from the shock absorber toward the inside of the guard fence.
When the tension of the lateral rope exceeds the gripping force of the extra length portion by the shock absorber, slip occurs between the extra length portion and the grip hole.
Mounting structure of horizontal rope and shock absorber in guard fence. The attachment structure for a horizontal rope and a shock absorber in a guard fence according to claim 10, wherein the reversing guide body is connected to a support and the shock absorber is moored to the inner side surface of the support. The feature is that the shock absorber is urged in the direction of the column when the horizontal rope slips due to the difference in diameter between the insertion hole and the gripping hole of the shock absorber through which the extra length of the horizontal rope wound around the reversing guide body is inserted. 10. The attachment structure of the horizontal rope and the shock absorber in the guard fence according to claim 10.

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