JP5047925B2 - Protective body - Google Patents

Description

  The present invention relates to a protective body.

Conventionally, in order to prevent falling objects such as stones, earth and sand, and snow from falling on roads and buildings, protective bodies have been installed on cliffs and slopes on mountainsides.
Such a protective body is generally composed of a net, a support to which the net is attached, and a support for fixing the support.

As such a protective body, a metal net is used and a wire rope is used as a support (for example, see Patent Documents 1 to 4).
Further, a protective body using a net made of a synthetic fiber that is lightweight is known (for example, see Patent Document 5). In such a protective body, a holding rope is used as a support.
JP-A-61-109806 Japanese Patent Laid-Open No. 7-300820 JP-A-7-197423 Japanese Patent Laid-Open No. 2000-273727 JP 2003-261910 A

However, in the protectors described in Patent Documents 1 to 4, since the weight of the metal net is generally large, the support that supports them is also required to be robust such as a wire rope. For this reason, the construction of the protective body using these members becomes large-scale, and heavy machinery and dedicated equipment are required. As a result, the construction cost increases and the construction period is prolonged.
Further, since the place where the protective body is constructed is usually a place where a scaffold such as a cliff or a slope is bad, use of heavy machinery and large-scale equipment is limited, and there is a problem in workability and safety.
Furthermore, since a metal net is used, there is almost no extension and it is difficult to absorb the impact.

On the other hand, since the protective body described in Patent Document 5 uses a net made of a synthetic fiber that is lightweight, a temporary improvement is achieved with respect to the weight.
Further, since plastic deformation unique to the synthetic fiber net occurs, there is also an advantage that the impact energy can be easily absorbed as compared with the metal net.

However, since a net made of synthetic fibers has a lower mechanical strength than a metal net, it is easily damaged when impacts such as falling rocks are concentrated on a part.
In addition, a rockfall prevention net using a synthetic fiber net is inevitably provided with a rope for supporting the net in an expanded state in order to be attached to a support column. In the body, it is very troublesome to attach the rope material and the net, and the number of manufacturing steps is increased.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a protective body that is lightweight but has excellent mechanical strength and is easy to assemble and install.

  The present inventors have intensively studied to solve the above-mentioned problems. As a result, the net, the peripheral rope and the support rope are made of synthetic fibers to reduce the weight, and the peripheral rope is alternately inserted into the mesh at the peripheral edge of the net. Surprisingly, it has been found that the above problems can be solved, and the present invention has been completed.

That is, the present invention is (1) a net-like net, a first impact absorber comprising a peripheral rope supporting the net and a support rope supporting the peripheral rope, and disposed on both sides of the first impact absorber. The support rope is stretched, and the net and the peripheral rope are both made of synthetic fiber, and the peripheral rope is attached by alternately inserting the mesh of the peripheral edge of the net , In the protective body, the breaking elongation of the peripheral rope is larger than the breaking elongation of the net .

  The present invention resides in (2) the protective body according to the above (1), further including a second shock absorber made of a buffer rope, and the buffer rope being stretched on the support in a state of being attached to the back surface of the net.

This invention exists in the protector as described in said (1) or (2) whose ( 3 ) breaking elongation of a peripheral rope is 30 to 300% and breaking elongation of a net is 10 to 200%.

The present invention, (4) a second shock absorber lies in the protection of the (2) described comprising a plurality of buffer rope is stretched in a straight line.

The present invention, (5) a plurality of buffer rope are parallel to each other, consists in protection of the (4), wherein the buffer rope to each other are connected by a belt.

The present invention includes: ( 6 ) a net-like net, a first impact absorber comprising a peripheral rope supporting the net and a support rope supporting the peripheral rope, and the support disposed on both sides of the first impact absorber. A protection body in which both the net and the peripheral rope are made of synthetic fibers, and the peripheral rope is alternately inserted through the mesh at the peripheral edge of the net. And a second shock absorber made of a buffer rope, the buffer rope being stretched on the support in a state of being attached to the back surface of the net, and the breaking elongation of the buffer rope being determined by the breaking of the net. It exists in a protective body larger than the elongation.

This invention exists in the protector of the said ( 6 ) description whose breaking elongation of ( 7 ) buffer rope is 30 to 300%.

In addition, as long as the objective of this invention is met, the structure which combined suitably said (1)-( 7 ) is also employable.

In the protective body of the present invention, since the net and the peripheral rope are made of synthetic fibers, the weight is reduced. For this reason, construction of a protective body is easy and a special heavy machine is unnecessary. In addition, since the structure easily absorbs rockfall energy, a heavy shock absorber is not necessary. Further, since the attachment of the peripheral rope to the net is extremely simple, the protective body can be easily assembled.
Therefore, even if the above-mentioned protective body is a place where a foothold such as a cliff or a slope is bad, the protective body can be sufficiently constructed and is excellent in safety.

In addition to this, since the net and the peripheral rope are synthetic fibers and the peripheral rope is attached by alternately inserting the mesh at the peripheral edge of the net so that the peripheral rope has freedom of movement, Even if there is, it is difficult to apply a local force as the first shock absorber, and the impact force at the time of dropping can be accurately dispersed and absorbed.
For this reason, the protective body is hardly broken even if there is a fallen object, and has excellent mechanical strength and durability.

  The protective body of the present invention further includes a second shock absorber made of a buffer rope, and if the second shock absorber is stretched on the support in a state of being attached to the back surface of the net, even if there is a fallen object Since the impact force at the time of dropping can be reliably absorbed in the entire protective body, it is more difficult to break, and the mechanical strength and durability are more excellent.

The buffer rope is preferably provided independently of the mesh net. That is, it is preferable not to integrate the buffer rope with the mesh net by inserting the buffer rope through the mesh net.
In this case, mechanical strength and durability are excellent as compared with the case of integration.

  In the above protective body, when the breaking elongation of the peripheral rope is larger than the breaking elongation of the net, the net can disperse at least the first impact when receiving the fallen object throughout the net. In addition, the peripheral rope having a higher breaking elongation than the net can absorb the impact caused by the fallen object, and can stretch and support the entire net deformed in all forms. In addition, it is preferable that the breaking elongation of a peripheral rope is 30 to 300%, and the breaking elongation of a net is 10 to 200%.

  If the said protection body consists of several buffer ropes with which the 2nd shock absorber was stretched | stretched linearly, it can suppress that a net | network extends locally by a fallen object. Thereby, the said protection body becomes difficult to damage more.

In this case, the second shock absorber is preferably a plurality of buffer ropes arranged in parallel so as to be parallel to each other, and more preferably, the buffer ropes are connected by a belt.
The protective body in this case can absorb the impact force at the time of dropping more reliably even if there is a fallen object, so that it is more difficult to break, and the mechanical strength and durability are further improved.

In the above-mentioned protective body, when the breaking elongation of the buffer rope is larger than the breaking elongation of the net, the buffer rope can absorb the energy impact caused by the falling object and can reliably assist the net deformed in all forms. In addition, it is preferable that the breaking elongation of a buffer rope is 30 to 300%.
For this reason, the said protection body becomes much more difficult to tear.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as necessary. In the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. Further, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified. Further, the dimensional ratios in the drawings are not limited to the illustrated ratios.

[First Embodiment]
First, a first embodiment of a protective body according to the present invention will be described.
FIG. 1 is a rear view schematically showing a protective body according to the first embodiment.
As shown in FIG. 1, a protective body 10 according to this embodiment includes a first absorbent body 1 including a net-like net 11, a peripheral rope 12 that supports the net 11, and a support rope 13 that supports the peripheral rope 12. And support columns 15 disposed on both sides of the net 11 and having support ropes 13 stretched thereon. The protective body 10 includes a support 15a for fixing the support column 15.

In the protective body 10, the net 11 has a rectangular shape, and a peripheral rope 12 is provided on the periphery of the net 11.
Here, FIG. 2 is an enlarged view of the part P1 of the protective body according to the first embodiment.
As shown in FIG. 2, the peripheral rope 12 is attached to the net 11 by alternately inserting the peripheral mesh of the net 11. That is, by attaching the net 11 in this way, the degree of freedom of movement with respect to the peripheral rope 12 is secured.
Moreover, since the attachment of the peripheral rope 12 to the net 11 is extremely simple, the protective body 10 can be easily assembled.
Therefore, the protective body 10 can be sufficiently constructed even when the scaffolding such as a cliff or a slope is bad, and is excellent in safety.

Here, FIG. 3 is an enlarged view of a part P2 of the protective body according to the first embodiment.
As shown in FIG. 3, one end of the support rope 13 is attached to the peripheral rope 12 with a degree of freedom of movement, and the other end is fixedly attached to the support column 15.
For example, the support rope 13 is attached so as to crawl the peripheral rope 12. Thereby, the support rope 13 can be moved along the peripheral rope 12. Four support ropes 13 are provided at the four corners (upper left, lower left, upper right, and lower right) of the peripheral rope 12 positioned at the peripheral edge along the shape of the net 11.

  In the protective body 10, it is preferable that both the net 11 and the peripheral rope 12 are made of synthetic fibers, and the breaking elongation thereof is adjusted to 10% or more. Details of these will be described later.

  The protective body 10 has a structure for receiving falling objects such as stones, earth and sand, and snow with a net 11. That is, when there is a fallen object, the protective body 10 first bends due to the net 11 being stretched, and then the peripheral rope 12 that supports the net 11 is stretched to absorb the impact force when the fallen object falls. Is done.

And since the peripheral rope 12 is attached to the support | pillar 15 fixed via the support rope 13, the state which absorbed the impact at the time of falling of a fallen object is maintained.
In particular, since the peripheral rope 12 is attached by alternately inserting the peripheral mesh of the net 11, the force is distributed even if an impact is applied to the net 11, and the force is applied to the net 11 and a part of the peripheral rope 12. Will not concentrate.

Since the net 11 and the peripheral rope 12 are made of synthetic fiber, the protective body 10 is light in weight, and the construction of the protective body 10 is easy even if the scaffolding such as a cliff or a slope is bad. No special heavy machinery or special equipment is required.
In addition, although the protective body 10 has the net 11 and the peripheral rope 12 made of synthetic fiber, as described above, the protective body 10 can sufficiently absorb the impact when the fallen object falls, so that it is difficult to break and has mechanical strength and durability. It is excellent.

  The protective body 10 is preferably used mainly on hillside cliffs, slopes and the like in order to prevent falling objects such as stones, earth and sand, and snow from falling on roads and buildings.

  Hereinafter, the net 11, the peripheral rope 12, the support column 15, and the buffer rope 18 will be described in more detail.

(Net)
In the protection body 10 according to the present embodiment, the net 11 has a rectangular structure that is knitted as a whole.
The knitting configuration of the net 11 is not particularly limited, and may be either a knot type or a no knot type.
Moreover, there is no limitation also on the shape of the net | network 11, the magnitude | size (mesh) of a mesh | network, and thickness, What is necessary is just to determine suitably according to the scale of the fall rock etc. anticipated in the place installed.

Synthetic fibers (hereinafter referred to as “net synthetic fibers” for convenience) are used for the net 11.
In this case, compared with the metal net described in the prior art, it is excellent in workability and safety.
The synthetic fiber for the net is not particularly limited, but a high-strength and high-elastic material is suitable for catching falling rocks, for example, polyolefin fibers such as polyethylene and polypropylene, ultrahigh molecular weight polyethylene fibers, and low-pressure polyethylene fibers. Polyester fibers such as polyarylate fiber, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyamide fibers such as polyamide 6, polyamide 11, polyamide 12, polyamide 46, polyamide 66, polyparaterephthalamide, polymetaterephthalamide, etc. Examples include aramid fiber, polybenzoxazole fiber, carbon fiber, poly-p-phenylenebenzobisoxazole fiber, polyoxyketone fiber, acrylic fiber, rayon fiber, and glass fiber. These may be used alone or in combination of two or more.

Among these, it is preferable that the synthetic fiber for nets is a polyester fiber.
If the synthetic fiber for the net is a polyester fiber, the durability is excellent. Moreover, since it is excellent in versatility, it can be manufactured at low cost.
In particular, the synthetic fiber for a net is more preferably a mixed fiber obtained by mixing polyethylene terephthalate and polyparaterephthalamide or polymetaterephthalamide. In this case, the strength is excellent even if the fiber itself is not thickened.

The breaking elongation of the net 11 is preferably adjusted to 10% or more. In this case, the impact at the time of receiving the falling object can be distributed over the entire net 11.
Further, the breaking elongation is more preferably 10 to 200%, and still more preferably 50 to 200%.
When the elongation at break exceeds 200%, compared to the case where the elongation at break is within the above range, the impact when receiving the fallen object is not dispersed, and the net 11 stretches locally, and consequently the net 11 breaks. May end up.

  Here, in this specification, the elongation at break refers to the length of the sample at the time of rupture when the sample is ruptured by applying a load to the sample and extending the sample, before the load is applied. When the length of the sample is B, it is a value (%) represented by (B−A) × 100 / A. Specifically, the Temporary Industrial Association “Safety Standard on Safety Net Structure, etc. This is a value measured in accordance with 6.2 of "Explanation".

The breaking strength of the net 11 is preferably 5 to 40 kN, and more preferably 5 to 10 kN.
When the breaking strength of the net 11 is less than 5 kN, it may break without being able to withstand the impact even though the breaking strength is within the above range, and the strength may be 40 kN. When the strength exceeds the range, the diameter of the net 11 is increased compared to the case where the strength is within the above range, and the net 11 becomes heavier, and the workability during construction of the protective body tends to deteriorate.

  Here, in the present specification, the breaking strength is a value of the load at the time of breaking when the sample is stretched by applying a load to the sample and is broken. This is a value measured in accordance with 6.2 of the “Assurance Standards and Explanations on Safety Net Structure, etc.” of the Industrial Association

  The net 11 may be provided with an additive such as a photocatalyst, a colorant, an ultraviolet light improver, or a flame retardant.

(Peripheral rope)
The peripheral rope 12 is provided so as to surround the peripheral edge of the net 11, and support ropes 13 are attached to the four corners.
The peripheral rope 12 is attached to the net 11 by alternately inserting the mesh at the peripheral edge of the net 11. That is, the peripheral rope 12 supports the net 11 and ensures the freedom of movement of the net 11 with respect to the peripheral rope 12. Therefore, when an impact is applied to a certain part of the net 11, the net 11 slides along the peripheral rope 12, and the impact is spread and dispersed throughout the net 11. The attachment of the peripheral rope 12 to the net 11 is extremely simple as described above.

Synthetic fibers (hereinafter referred to as “peripheral rope synthetic fibers”) are used for the peripheral rope 12. In this case, compared with the wire rope etc. which were described in the prior art, it is excellent in workability and safety.
The synthetic fiber for the peripheral rope is not particularly limited, but a high-strength material is suitable for supporting the net 11, for example, polyolefin fibers such as polyethylene and polypropylene, polyarylate fibers, polyethylene terephthalate, polyethylene naphthalate, Polyester fibers such as polybutylene terephthalate, polyamide fibers such as polyamide 6, polyamide 11, polyamide 12, polyamide 46 and polyamide 66, aramid fibers such as polyparaterephthalamide and polymetaterephthalamide, polybenzoxazole fibers and carbon fibers Can be mentioned. These may be used alone or in combination of two or more.

Among these, it is preferable that the synthetic fiber for a peripheral rope is a polyester fiber or a polyamide fiber.
If the synthetic fiber for the peripheral rope is a polyester fiber or polyamide fiber having excellent versatility, there is a merit that it can be manufactured at low cost, and the elongation is excellent.
Moreover, since the peripheral rope 12 is mostly used outdoors, it is particularly preferable that the synthetic fiber for the peripheral rope is polyethylene terephthalate having excellent weather resistance. The peripheral rope synthetic fiber may be the same as or different from the above-described net synthetic fiber.

When the synthetic fiber for the peripheral rope is a polyester fiber, when the polyester fiber is synthesized, a third component such as isophthalic acid, neopentyl glycol, bisphenol A ethylene oxide adduct is contained in addition to the main raw material. Also good. In other words, the polyester main raw material and the third component may be copolymerized.
In this case, physical properties based on the third component can be added.

  Although the thickness of the peripheral rope 12 can be used as long as it can pass through the eyes of the net 11, the diameter is preferably 10 to 40 mm.

The peripheral rope 12 is preferably formed from a multifilament.
The filament may have a round cross-section, an elliptical or triangular cross-section, or a hollow cross-section.

  The peripheral rope 12 is not particularly limited in the fineness and the number of filaments, but from the viewpoint of mechanical strength, the filament having a fineness of 0.5 to 20 dtex is a bundle of 100 to 1000 yarns. It is preferable.

It is preferable that the breaking elongation of the peripheral rope 12 is adjusted to 30% or more. In this case, the net 11 receiving the fallen object can be reliably supported by elastic deformation and permanent deformation.
Further, the breaking elongation is more preferably 30 to 300%, still more preferably 100 to 300%, and particularly preferably 150 to 300%.
When the breaking elongation is less than 30% as in a normal rope, the net 11 may not be sufficiently supported as compared to the case where the breaking elongation is within the above range, and the breaking elongation is 300%. If it exceeds, since the peripheral rope 12 is excessively stretched compared to the case where the breaking elongation is within the above range, the impact force absorbed by the net 11 may reach other parts of the protective body 10.

The breaking elongation of the peripheral rope 12 is preferably larger than the breaking elongation of the net 11.
In this case, the peripheral rope 12 can reliably support the entire net 11 even when the net 11 absorbs the energy impact caused by the falling object and is deformed into any form.

The breaking strength of the peripheral rope 12 is preferably larger than the breaking strength of the net, and specifically, it is preferably 30 to 100 kN.
If the breaking strength is less than 30 kN, it may break without being able to withstand the impact even if it can absorb the impact, compared to the case where the breaking strength is within the above range, and if the breaking strength exceeds 100 kN Compared with the case where the breaking strength is within the above range, the rope has a diameter of 40 mm or more, so it becomes heavy and the workability during the construction of the protective body tends to deteriorate.

  The peripheral rope 12 may be provided with additives such as a photocatalyst, a colorant, an ultraviolet light improver, a flame retardant, and the like.

(Supporting rope)
The support rope 13 is interposed between the peripheral rope 12 and the support column 15, supports the peripheral rope 12, and functions to connect to the fixed support column 15.
One end of the support rope 13 is attached to the peripheral rope 12 with a degree of freedom of movement, and the other end is fixed to the support column 15. Four support ropes 13 are provided at the four corners (upper left, lower left, upper right, and lower right) of the peripheral rope 12 positioned at the peripheral edge along the shape of the net 11.

  Here, in order for the support rope 13 to have a degree of freedom, the support rope 13 may be attached so as to crawl the peripheral rope 12. Then, the support rope 13 can move along the peripheral rope 12.

  As the support rope 13, a rope made of a metallic wire or synthetic fiber is used. In addition, this synthetic fiber is synonymous with the synthetic fiber used for the peripheral rope 12 mentioned above.

When the support rope 13 is a synthetic fiber, it is preferable that it is a polyester fiber or an aramid fiber.
If the synthetic fiber is a polyester fiber having excellent versatility, there is a merit that it can be manufactured at low cost. If the synthetic fiber is an aramid fiber, the strength is excellent even if the fiber itself is not thickened.
In addition, the synthetic fiber used for the support rope 13 may be the same as or different from the synthetic fiber for net described above, and may be the same as or different from the synthetic fiber for peripheral rope described above.

(Support)
The support | pillar 15 is arrange | positioned at the both sides of the net | network 11, and the peripheral rope 12 is attached.
The material and size of the support column 15 may be appropriately designed in terms of strength, structure, and the like according to the scale of rock fall expected at the place where the column 15 is constructed.
For example, as the support | pillar 15, what made the structure comprised with concrete support | pillars, concrete, and a steel pipe was embed | buried in foundation concrete or the ground. In addition, when standing rock fall is expected to be relatively small, natural standing trees may be used as struts.

In the protective body 10, a support 15 a is attached to the support column 15. Thereby, the support | pillar 15 is fixed in the more stable state.
As the support 15a, a conventional one is used as appropriate. In addition, since the protection body 10 is lightweight, it is not always necessary to make the support 15a robust, but it may be as strong as a wire rope from the viewpoint of improving safety.

Next, an example of the assembly and construction method of the protective body 10 according to the present embodiment will be described.
First, two columns 15 made of concrete are installed at a place where the protective body 10 is to be installed, such as a cliff or slope on a mountainside. At this time, a part of the column 15 is buried in the ground and fixed.
Then, by attaching the support 15a to both the struts 15, both the struts 15 are securely fixed.

On the other hand, the peripheral rope 12 is attached to the net 11 so as to alternately pass the peripheral mesh of the net 11.
Then, one end of the support rope 13 is attached to the peripheral rope 12 positioned at the four corners of the net 11. Note that these operations may be performed on site or in a manufacturing factory.

Next, the other end of the support rope 13 is tied to the upper and lower portions of the support column 15 and fixed. That is, the other end of the upper left support rope 13 is attached to the upper portion of the left support column 15, the other end of the lower left support rope 13 is attached to the lower portion of the left support column 15, and the other end of the upper right support rope 13. Is attached to the upper part of the right column 15 and the other end of the lower right support rope 13 is attached to the lower part of the right column 15. Accordingly, the net 11 is supported by the peripheral rope 12, and the peripheral rope 12 is attached to the support column 15 via the support rope 13.
Through the above steps, the protective body 10 is assembled and installed at the planned installation location.

[Second Embodiment]
Next, a second embodiment of the protective body according to the present invention will be described.
FIG. 4 is a rear view schematically showing the protective body according to the second embodiment, and FIG. 5 is a side view schematically showing the protective body according to the second embodiment.
As shown in FIG. 4, the protective body 20 according to this embodiment includes a first shock absorber including a net-like net 11, a peripheral rope 12 that supports the net 11, and a support rope 13 that supports the peripheral rope 12. 1, a second shock absorber 2 composed of a buffer rope 18 attached to the back surface of the net 11, and a support column 15 disposed on both sides of the net 11 to stretch the support rope 13 and the buffer rope 18.
Moreover, in the said protection body 20, the support tool 15a for fixing the support | pillar 15 reliably is provided.
That is, as shown in FIG. 5, the protective body 20 according to the present embodiment further includes an independent second shock absorber 2 (buffer rope 18) in addition to the protective body 10 according to the first embodiment. Thus, it is different from the protective body 10 according to the first embodiment.
Here, in this specification, the “back surface of the net” means a surface opposite to the surface on which the net receives a fallen object.

  In the protection body 20, the net 11 of the first shock absorber, the peripheral rope 12 and the buffer rope 18 of the second shock absorber are all made of synthetic fiber, and the peripheral rope is alternately inserted through the mesh at the peripheral edge of the net. Attached.

The protective body 20 has a structure in which the first shock absorber first receives a fallen object. That is, when there is a fallen object, the protective body 20 first bends when the net 11 of the first shock absorber 1 extends, disperses the impact, and the peripheral rope 12 that supports the net 11 extends. The impact force when the fallen object falls is absorbed (first stage shock absorption).
And since the peripheral rope 12 is attached to the support | pillar 15 fixed via the support rope 13, the state which absorbed the impact at the time of falling of a fallen object is maintained.

Next, in the 2nd shock absorber 2, the buffer rope 18 suppresses that the net | network 11 expands locally locally by the fall position of a fallen object. At that time, the shock absorbing rope 18 also extends to absorb the impact (second stage impact absorption).
As described above, the first shock absorber 1 and the second shock absorber 2 perform two-stage shock absorption.

The protective body 20 is made of light weight because the net 11 of the first shock absorber, the peripheral rope 12 and the buffer rope 18 of the second shock absorber are made of synthetic fibers, so that scaffolds such as cliffs and slopes can be used. Even if it is a bad place, construction of the protective body 20 is easy, and special heavy machinery and dedicated equipment for that purpose are unnecessary.
In addition, although the net 11, the peripheral rope 12 and the buffer rope 18 are made of synthetic fibers, the protective body 20 can absorb the impact when the fallen object falls as described above. Strength and durability are more excellent.

  The protective body 20 is preferably used for hillside cliffs and slopes in order to prevent falling objects such as stones, earth and sand, and snow from falling on roads and buildings.

  Hereinafter, the buffer rope 18 having the second shock absorbing function will be described in more detail. In addition, the net 11, the peripheral rope 12, the support rope 13, and the support | pillar 15 are synonymous with the protection body 10 which concerns on 1st Embodiment mentioned above.

(Buffer rope)
The buffer rope 18 of the second shock absorber is stretched on the support column 15 so as to be linear on the back surface of the net 11.
In the protection body 20 according to the present embodiment, as shown in FIG. 5, the five buffer ropes 18 are linearly attached so as to be parallel to each other.
Here, it is preferable that the buffer rope 18 is disposed in a state of being attached to the net 11 so as to be in contact with the back surface of the net 11 without passing through the mesh.
In this case, since the buffer rope 18 and the net 11 are separate bodies, the function can be exhibited independently. In addition, if a buffer rope is provided so that it may penetrate alternately to the net | network of the net | network 11, the impact force at the time of falling rock will be received in the narrow area | region between a buffer rope and a net | network.

As described above, the protective body 20 can further suppress the net 11 from being locally extended by a fallen object by further including the second shock absorber 2. Thereby, the said protection body 10 becomes difficult to damage more.
In the protective body 20, the second stage shock absorption is achieved by the extension of the buffer rope 18, and the second stage shock absorption is achieved by the first shock absorber such as the net 11 and the second shock absorber of the buffer rope 18. Done. It should be noted that this shock absorbing action is performed instantaneously and almost simultaneously.

For the buffer rope 18, a synthetic fiber (hereinafter referred to as “buffer rope synthetic fiber” for convenience) is used.
The synthetic fiber for the buffer rope is not particularly limited, but examples thereof include polyolefin fibers such as polyethylene and polypropylene, polyarylate fibers, polyester fibers such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, polyamide 6, polyamide 11, and polyamide. 12, polyamide fibers such as polyamide 46 and polyamide 66, aramid fibers such as polyparaterephthalamide and polymetaterephthalamide, polybenzoxazole fibers and carbon fibers. These may be used alone or in combination of two or more.

Among these, it is preferable that the synthetic fiber for buffer ropes is a polyester fiber or a polyamide fiber.
When the synthetic fiber for the buffer rope is a polyester fiber or polyamide fiber having excellent versatility, there is a merit that it can be manufactured at low cost, and the elongation is excellent.
Further, since the buffer rope 18 is mostly used outdoors, it is particularly preferable that the synthetic fiber for the buffer rope is polyethylene terephthalate having excellent weather resistance. In addition, the synthetic fiber for buffer ropes may be the same as or different from the synthetic fiber for nets described above, and may be the same as or different from the synthetic fiber for peripheral ropes described above.

In addition, when the synthetic fiber for buffer rope is a polyester fiber, when synthesizing the polyester fiber, the third component such as isophthalic acid, neopentyl glycol, bisphenol A ethylene oxide adduct is contained in addition to the main raw material. Also good. In other words, the polyester main raw material and the third component may be copolymerized.
In this case, physical properties based on the third component can be added.

  From the viewpoint of handleability, the thickness of the buffer rope 18 is preferably 10 to 40 mm, and more preferably 15 to 30 mm.

It is preferable that the buffer rope 18 is formed from a multifilament.
The filament may have a round cross-section, an elliptical or triangular cross-section, or a hollow cross-section.

  The buffer rope 18 is not particularly limited in the fineness and the number of filaments, but from the viewpoint of mechanical strength, the filament having a fineness of 0.5 to 20 dtex is a bundle of 100 to 1000 yarns. It is preferable.

Here, it is preferable that the breaking elongation of the buffer rope 18 is adjusted to 20% or more. In this case, the net 11 receiving the fallen object can be reliably supported by elastic deformation and permanent deformation.
Further, the breaking elongation is more preferably 30 to 300%, still more preferably 100 to 300%, and particularly preferably 150 to 300%.
When the breaking elongation is less than 30% as in a normal rope, the deformation of the net 11 due to falling objects tends to be restrained compared to the case where the breaking elongation is within the above range. When the degree exceeds 300%, the buffer rope 18 is excessively stretched compared to the case where the breaking elongation is within the above range, and thus the effect of catching the deformation of the net 11 tends not to be exhibited.

The breaking elongation of the buffer rope 18 is preferably larger than the breaking elongation of the net 11.
In this case, the buffer rope 18 can reliably receive the entire deformation of the net 11 even when the net 11 absorbs the energy impact caused by the falling object and is deformed into any form.

The breaking strength of the buffer rope 18 is preferably 30 to 100 kN.
If the breaking strength is less than 30 kN, it may break without being able to withstand the impact even if it can absorb the impact, compared to the case where the breaking strength is within the above range, and if the breaking strength exceeds 100 kN Compared with the case where the breaking strength is within the above range, the rope has a diameter of 40 mm or more, so it becomes heavy and the workability during the construction of the protective body tends to deteriorate.

  The buffer rope 18 may be provided with additives such as a photocatalyst, a colorant, an ultraviolet light improver, and a flame retardant.

Next, an example of the assembly and construction method of the protective body 20 according to the present embodiment will be described.
The protective body 20 according to the present embodiment is assembled and constructed after the first shock absorber 1 is assembled and constructed in the same manner as the protective body 10 according to the first embodiment described above. Is done.

In the second shock absorber 2, five buffer ropes 18 are stretched along the back surface of the net 11 so as to be linear in the lateral direction from one strut 15 toward the other strut 15. The buffer rope 18 is fixed by being tied to the support columns 15 at both ends.
Through this step, the protective body 20 is installed at the planned installation location.

[Third Embodiment]
Next, a third embodiment of the protection body according to the present invention will be described.
FIG. 6 is a rear view schematically showing the protective body according to the third embodiment.
As shown in FIG. 6, the protection body 30 according to the present embodiment includes a first impact including a mesh net 11, a peripheral rope 12 for supporting the net 11, and a support rope 13 for supporting the peripheral rope 12. The absorber 1, the second shock absorber 2 including a plurality of buffer ropes 18 provided on the back surface of the net 11 and a belt 19 connecting the buffer ropes, the support rope 13 and the buffer disposed on both sides of the net 11. And a column 15 to which the rope 18 is attached. In addition, the protective body 30 includes a support 15a for securely fixing the support column 15. That is, the protective body 30 according to the present embodiment is different from the protective body 20 according to the second embodiment in that the buffer ropes 18 are six and the buffer ropes 18 are connected to each other by the belt 19. . Further, a method of stretching the buffer rope 18 to be described later to the support column 15 is also different. In the protective body 30, the net 11, the peripheral rope 12, the support rope 13, the support column 15, and the buffer rope 18 themselves are the same as the protective body 20 according to the second embodiment described above.

Since the protection body 30 is the second shock absorber and the buffer ropes 18 are connected to each other by the belt 19 at an appropriate position, the distance between the buffer ropes 18 is not easily increased due to falling objects. Further, since the belt 19 is not fixed to the buffer rope, the belt 19 does not restrain the extension of the buffer rope 18. For this reason, the shock absorbing force with respect to the fallen object of the buffer rope 18 is ensured.
Therefore, even if there is a fallen object, the distance does not spread locally, so that the shape as the protective body 30 does not collapse, and the impact force at the time of fall can be more reliably absorbed.
For this reason, since the protective body 30 has a higher impact absorption capability than the protective body 10 according to the first embodiment or the protective body 20 according to the second embodiment, it is more difficult to break, and has better mechanical strength and durability. .

FIG. 7 is a schematic diagram illustrating an example of a connection portion between a buffer rope and a belt in the protection body according to the third embodiment.
As shown in FIG. 7, the belt 19 of the protection body 30 is provided with a plurality of openings through which the buffer rope 18 can be inserted. Specifically, since the opening is formed by folding the belt 19 in half and sewing appropriately, the upper and lower buffer ropes 18 are connected to each other by inserting the buffer rope 18 therein.

  For this reason, the buffer rope 18 is not restrained in the lateral direction (longitudinal direction of the buffer rope 18), and can be expanded and contracted. On the other hand, since the buffer ropes 18 are restrained in the vertical direction (longitudinal direction of the belt 19), the buffer ropes 18 spread in the vertical direction, and even if the net 11 extends, it cannot be suppressed. Can be prevented. Therefore, it is possible to avoid a situation in which the shock cannot be absorbed. Since the plurality of buffer ropes 18 are arranged in parallel to each other, the belt 19 is preferably arranged in a direction orthogonal to the plurality of buffer ropes 18.

Next, an example of the assembly and construction method of the protective body 30 according to the present embodiment will be described.
As with the protective body 20 according to the second embodiment described above, the protective body 30 according to the present embodiment is assembled and constructed after the first shock absorber 1 is assembled and constructed. Is done.

  The second shock absorber 2 is stretched so as to be linear in the lateral direction along the back surface of the net 11 with a buffer rope 18 (six here) from one support 15 toward the other support 15. The At this time, the buffer ropes 18 are connected to each other using the belt 19.

Further, as shown in FIG. 6, the buffer rope 18 is stretched around the support 15 by fixing a fixing member 21 such as a chain or a fiber belt having through holes at fixed intervals to the support 15. The buffer rope 18 is passed through in a loop. In order to make the buffer rope 18 into a ring shape, the ends of the buffer rope 18 may be connected by a method that does not impair the strength of the buffer rope 18 such as crimping or tie-up.
According to this method, the degree of freedom of the buffer rope 18 is excellent, and the construction becomes easy.
By such a process procedure, the protective body 30 is accurately constructed at the planned installation location.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

  For example, in the protective body 20 according to the second embodiment, five buffer ropes 18 are used, and in the protective body 30 according to the third embodiment, six buffer ropes 18 are used. The number is not limited to these. That is, 1 to 4 may be sufficient, and 7 or more may be sufficient. If the number is even, the buffer rope 18 can be formed in a ring shape as described above, so that the degree of freedom is excellent and the construction is easy.

In the protective bodies 10, 20, and 30 according to the first to third embodiments, the rectangular net 11 is used, but it may be a square, a polygon, a circle, an ellipse, a rhombus, or the like.
The net 11 may be used in a double manner.

In the protective bodies 10, 20, and 30 according to the first to third embodiments, the support rope 13 is used and the peripheral rope 12 is fixed to the support column 15. However, the peripheral rope 12 may also serve as the support rope 13. . In other words, instead of using the support rope 13, a part of the peripheral rope 12 may be fixed to the support column 15 directly.
For example, the peripheral rope 12 corresponding to the four corners of the net 11 may be extended and slackened, and directly tied to the support column 15 to be fixed.

  In the construction method using the protection bodies 10, 20, and 30 according to the first to third embodiments, two support columns 15 are used, but the number of support columns 15 is not particularly limited. In addition, in order to exhibit the impact absorption effect of a protective body more, it is preferable that the space | interval of support | pillars is 3-10 m.

  In the protective bodies 10, 20, and 30 according to the first to third embodiments, the support tool 15a for fixing the support column 15 is provided, but the support tool 15a is not an essential constituent element.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

(Preparing the net)
A net having physical properties shown in Table 1 was prepared.

(Rope preparation)
A rope having physical properties shown in Table 2 was prepared.

(Examples 1 to 10)
First, the ropes (peripheral ropes) were attached by alternately passing through the meshes at the periphery of the net.
Then, one end of a support rope (aramid fiber) was attached to a rope (peripheral rope) located at the four corners of the net, and the other end was tied to a column made of concrete.
In Examples 6 to 10, a rope (buffer rope) was stretched in a straight line along the net on the side opposite to the surface that received the fallen object.
In Example 8, buffer ropes were alternately inserted into the net mesh.
Moreover, in Example 9 and Example 10, the buffer rope attached linearly was bound by the belt.
The buffer rope was attached in the form of a ring via a fiber belt fixed to the support column.
Thus, a sample of the protective body was produced.
Table 3 below shows a list of nets, peripheral ropes, and buffer ropes used in preparing the protective body samples.

(Evaluation 1)
A drop test was performed using the samples of the protective bodies obtained in Examples 1-10.
A sample of the protector was placed horizontally, and a heavy plate having a diameter of 900 mm was dropped from above, and the state of the sample of the protector was visually confirmed.
The weight of the weight is 5 kN in Examples 1-4 and 9 kN in Examples 5-10.
Tables 4 and 5 show the results obtained for the net and rope combinations used and the height at which the heavyweight is dropped.
In Tables 4 and 5, “No” indicates that the protective body sample was not damaged, and “X” indicates that the protective body sample was damaged. Those which did not exist are set as “△”.
Note that “−” is an item for which measurement is omitted.

Moreover, the maximum energy (kJ) of the samples of the protective bodies of Examples 1 to 7, 9 and 10 was calculated.
The results obtained are shown in Table 6.
In Table 6, the maximum energy (kJ) is potential energy based on “fall height × weight”.

As is clear from Tables 4 to 6, it was confirmed that Examples 1 to 10 using the protective body of the present invention were superior in mechanical strength when the breaking elongation of the peripheral rope was larger than the breaking elongation of the net. It was done.
Moreover, it was confirmed that the mechanical strength is excellent when a buffer rope is used. Furthermore, it was confirmed that the mechanical strength is particularly excellent when the buffer rope is bound with a belt. In Example 10 using the buffer rope, the mechanical strength was particularly excellent.

FIG. 1 is a rear view schematically showing a protective body according to the first embodiment. FIG. 2 is an enlarged view of a part P1 of the protective body according to the first embodiment. FIG. 3 is an enlarged view of a portion P2 of the protective body according to the first embodiment. FIG. 4 is a rear view schematically showing the protective body according to the second embodiment. FIG. 5 is a side view schematically showing a protective body according to the second embodiment. FIG. 6 is a rear view schematically showing the protective body according to the third embodiment. FIG. 7 is a schematic view showing a connection portion between the buffer rope and the belt in the protective body according to the third embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... 1st shock absorber 2 ... 2nd shock absorber 10, 20, 30 ... Protective body 11 ... Net 12 ... Perimeter rope 13 ... Support rope 15 ... Post 15a ... support 18 ... buffer rope 19 ... belt 21 ... fixing material P1, P2 ... part

Claims (7)

A net-like net, a peripheral rope for supporting the net, and a first shock absorber comprising a support rope for supporting the peripheral rope;
The support | pillar which was arrange | positioned on both sides of the said 1st shock absorber, and the said support rope was stretched,
With
Both the net and the peripheral rope are made of synthetic fibers,
Said peripheral ropes have been attached al is passed through alternating mesh of the periphery of said net,
A protective body in which the breaking elongation of the peripheral rope is larger than the breaking elongation of the net . A second shock absorber made of a buffer rope;
The protective body according to claim 1, wherein the buffer rope is stretched on the support column in a state of being attached to the back surface of the net.   The protective body according to claim 1 or 2, wherein the breaking elongation of the peripheral rope is 30 to 300%, and the breaking elongation of the net is 10 to 200%.   The protective body according to claim 2, wherein the second shock absorber is composed of a plurality of buffer ropes stretched linearly. The protective body according to claim 4, wherein the plurality of buffer ropes are parallel to each other, and the buffer ropes are connected by a belt. A net-like net, a peripheral rope for supporting the net, and a first shock absorber comprising a support rope for supporting the peripheral rope;
The support | pillar which was arrange | positioned on both sides of the said 1st shock absorber, and the said support rope was stretched,
With
Both the net and the peripheral rope are made of synthetic fibers,
A protective body to which the peripheral rope is attached by being alternately inserted through the mesh of the peripheral edge of the net,
A second shock absorber made of a buffer rope;
The buffer rope is stretched on the support in a state of being attached to the back surface of the net,
A protective body in which the breaking elongation of the buffer rope is larger than the breaking elongation of the net. The protective body according to claim 6 , wherein the breaking elongation of the buffer rope is 30 to 300%.

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