JP2017179851A - Flying-thing protective barrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flying object protection barrier capable of accurately receiving the energy of a flying object and protecting a protected object. It is a flying object protection barrier 10 for protecting from Y. The flying object protection barrier 10 is stretched between a frame body 16 fixedly installed on the outside of the protection target object X and a large number of ring members made of wires made of hard steel wire rods connected to the frame body 16. It has a ring net 25 formed as a reticulated body. Since the strength of the ring net 25 in the region near the skeleton member is larger than the strength in the central region, even when a high-energy flying object Y collides with the ring net 25 in the region near the skeleton member, the collision portion In addition, it is possible to prevent the ring net 25 from breaking due to stress concentration on the ring member 30 at the attachment portion from the collision portion to the nearest wire rope 40. [Selection diagram] Fig. 1

Description

  The present invention relates to a flying object protection barrier, and more particularly, to a flying object protection barrier that is provided between a flying object and a protection object to protect the protection object from the flying object.

  The energy of natural disasters is very large. Conventionally, passenger cars wound up by tornadoes, block fences, steel lumbers, etc., jumped into the building, causing serious damage. In addition, when a volcanic eruption occurs, the volcanic gravel is blown up to a height of about 2,000 m by the energy of the eruption and falls.

  In order to protect the building from such flying objects, it is conceivable to use a wire mesh. Patent Document 1 discloses a generally used rhombus wire mesh. Patent Document 1 discloses a well-known rhombic wire mesh in which triangular wave wires made of iron wires having a thickness of 4 to 5 mm are arranged in parallel, and ridges and valleys of adjacent triangular wave wires are knitted together. .

  In addition to the diamond wire mesh, it is also possible to use a known ring net. A ring net is formed by winding a wire made of a hard steel wire a plurality of times and bundling the wire with a fastening means at several places in the circumferential direction so that the inner peripheral sides of adjacent ring members are in contact with each other. It is configured by connecting to each other.

  According to the ring net, when a projectile collides with the ring net, the energy of the projectile can be evenly diffused outward from the collision part via the ring member, and each ring member can be connected to the other ring. As shown in FIG. 10, the ring member is pulled outward at the connecting portion with the member, and as shown in FIG. 10, the ring member (see FIG. 10A) becomes substantially square (see FIG. 10B). Deform. As a result, the ring net is greatly extended in the traveling direction of the flying object, and the large energy of the flying object can be absorbed by the net.

JP-A-11-101026

However, according to the diamond wire mesh of Patent Document 1, the diamond wire mesh is composed of an iron wire, that is, a mild steel wire (generally, a tensile strength of 290 to 540 N / mm ² ). There is a risk that the large energy of flying objects such as lump-like objects such as plates and trucks cannot be received.

  In addition, according to the well-known ring net, it is possible to overhang in the traveling direction of the flying object in the central region and catch the large energy of the flying object, but in the vicinity of the wire rope to which the ring net is attached, There is a possibility that the energy absorption of flying objects due to deformation of the ring member may be insufficient.

  In other words, energy absorption due to deformation of the ring member is performed by sequentially deforming the ring member from a circular shape to a substantially quadrangular shape from the collision part of the flying object in the direction of the surface expansion of the ring net. When a high-energy projectile collides with the ring net in the vicinity, the number of ring members that can be deformed before the projectile energy is transmitted to the wire rope is small, so the energy of the projectile is absorbed by the deformation of the ring member. May become insufficient, and stress may concentrate on the ring member at the collision portion, and the ring net may break at the portion. In addition, energy may be transmitted to the ring member of the attachment part from the collision part to the nearest wire rope while the energy absorption of the flying object due to deformation of the ring member is insufficient, and the ring member of the attachment part may be broken. is there.

  This invention is made | formed in view of the said situation, The objective is to provide the flying object protection barrier which can receive the energy of a flying object reliably and can protect a protection target object.

  In order to achieve the above object, the invention described in claim 1 is provided on the outside of the object to be protected, and is fixed to the outside of the object to be protected in a flying object protection barrier for protecting the object to be protected from the object to be projected. And a ring net formed by connecting a plurality of ring members made of a wire made of a hard steel wire and stretched between the frame members. Is set to be larger in the region near the skeleton member than in the central region.

  According to this configuration, since the strength of the ring net in the region near the skeleton member is set to be larger than the strength in the central region, the case where a large energy projectile collides with the ring net in the region near the skeleton member. In addition, it is possible to prevent the ring net from being broken by the stress concentration on the ring member at the collision portion and the attachment portion from the collision portion to the nearest wire rope.

  According to a second aspect of the present invention, in the flying object protection barrier according to the first aspect of the present invention, the ring member is connected to each other by a ring member unit and / or a multiple ring member formed by stacking two or more ring members. The ring net is set such that the number of overlapping ring members constituting the ring member unit in the region near the skeleton member is set larger than the ring member constituting the ring member unit in the central region. It is characterized by.

  This configuration specifically shows an example of the configuration of the ring net described in claim 1, and according to this, the ring net in the region near the skeleton member is the number of overlapping ring members constituting the ring member unit. Since there are more ring members constituting the ring member unit in the central region, the strength of the ring net in the region near the skeleton member is larger than that in the central region.

  Therefore, the work of changing the strength of the ring net is simpler without changing the standard of the ring member itself.

  The invention according to claim 3 is the flying object protection barrier according to claim 1, wherein the ring member is a wound product made of a wire made of hard steel wire, and the number of the wound product in the circumferential direction. And the ring net is set such that the number of windings of the ring member in the region near the skeleton member is larger than the number of windings of the ring member in the central region. It is characterized by that.

  This configuration specifically shows an example of the configuration of the ring net according to claim 1, and according to this, the ring net in the region near the skeleton member is the number of windings of the wire wound of the ring member. Is larger than the winding of the wire of the ring member in the central region, so that the strength is greater than that in the central region.

  Therefore, the energy of the flying object received by the ring net can be more optimized by changing the number of turns of the wound object according to the required strength of the ring member in the ring net.

  The invention according to claim 4 is the flying object protection barrier according to any one of claims 1 to 3, wherein the ring net is not fixed to a wire rope stretched between the skeleton members. The wire rope is provided with a buffer means for allowing the wire rope to extend within a predetermined range when a load is applied to the ring net.

  According to this configuration, when a flying object collides with the ring net in the region near the skeleton member, the ring net is attached in an unfixed state at the attachment portion to the wire rope, so stress concentration on the attachment portion is reduced. It is avoided and the breakage of the ring net at the portion is suppressed.

  Further, when the large energy of the flying object is transmitted to the wire rope through the ring net, the wire rope is allowed to extend by the buffer means and the energy of the flying object is absorbed.

  Therefore, the large energy of the flying object colliding with the ring net in the region near the skeleton member can be received more reliably.

  According to a fifth aspect of the present invention, in the flying object protection barrier according to any one of the first to fourth aspects, the skeleton member is stretched between the ring net at a position outside the protection object. Passed, having a rhombus wire mesh made of a wire made of hard steel wire rod, and a substantially straight wire made of a hard steel wire rod was inserted between the bending portions in the knitting portion of the rhombus wire mesh It is characterized by that.

  According to this configuration, the rhombus wire mesh in which a substantially straight wire is inserted into the knitting portion can make the opening area of the mesh smaller than that of the ring net, so that even small flying objects can be received more reliably. It becomes possible. Moreover, the barrier is further strengthened by a rhombus wire mesh made of a wire made of a hard steel wire rod.

The invention according to claim 6 is the flying object protection barrier according to any one of claims 1 to 5, wherein the wire has a tensile strength of 800 to 2500 N / mm ² .

According to this configuration, when a ring net is present, the diamond-shaped wire mesh is a general-purpose wire mesh based on a wire made of a general mild steel wire, that is, an iron wire (generally having a tensile strength of 290 to 540 N / mm ² ). Is different, and is composed of a wire made of a hard steel wire having a tensile strength of 800 to 2500 N / mm ² .

  Therefore, even when a flying object having large energy collides with the vicinity of the skeleton part of the ring net, the energy can be accurately received.

  According to the present invention, since the strength of the ring net in the region near the skeleton member is larger than the strength in the central region, even if a high energy flying object collides with the ring net in the region near the skeleton member, Further, it is possible to prevent the ring net from being broken due to stress concentration on the ring member at the attachment portion from the collision portion to the nearest wire rope.

It is a schematic perspective view of the flying object protection barrier 10 which concerns on embodiment of this invention. 2 is a partially broken plan view schematically showing a flying object protection barrier 10. FIG. It is a partially broken plan view of the flying object protection barrier 10 in which the description of the rhombus metal mesh 35 is omitted. 3 is a perspective view showing a ring member 30 forming a ring net 25. FIG. (A) It is a principal part expansion perspective view of the ring net 25, (B) It is the b section enlarged view of FIG. 5 (A). 3 is an enlarged perspective view of a main part of a rhombus wire mesh 35. FIG. It is the VII-VII sectional view taken on the line of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is a figure which shows reception of the energy by the ring net 25 and the rhombus metal net | network 35 when the flying object Y collides with the flying object protection barrier 10. FIG. (A) A plan view showing a conventional ring net in which four ring nets are connected to one ring net, and (B) a plan view showing a deformed state of the ring member when an impact is applied.

  Next, the flying object protection barrier 10 according to the embodiment of the present invention will be described with reference to FIGS. 1 is a schematic perspective view of a flying object protection barrier 10 according to an embodiment of the present invention, FIG. 2 is a partially broken plan view schematically showing the flying object protection barrier 10, and FIG. 3 is a rhombus of the flying object protection barrier 10. FIG. 4 is a perspective view showing a ring member 30 forming the ring net 25, FIG. 5A is an enlarged perspective view of a main part of the ring net 25, and FIG. ) Is an enlarged view of the portion b in FIG. 5A, FIG. 6 is an enlarged perspective view of the main part of the rhombus wire mesh 35, FIG. 7 is a sectional view taken along the line VII-VII in FIG. FIGS. 9A and 9B are views showing energy reception by the ring net 25 and the diamond wire net 35 when the flying object Y collides with the flying object protection barrier 10.

  As shown in FIG. 1, the flying object protection barrier 10 according to the present embodiment includes eight column members 12 that are fixedly installed on the ground outside the protection target object X, and upper ends of these column members. And a skeleton member composed of beam members 13 and 14 assembled in a substantially rectangular shape in plan view in the vicinity of the center portion and the center portion, and the mesh body 20 is stretched between the beam members 13 (skeleton members). Has a basic configuration.

  In other words, a substantially rectangular frame 16 is formed by the beam member 13. The protection object X may be any object as long as it should be protected from flying objects. For example, buildings such as power plants, school buildings, factories, and houses, and traffic such as roads, railways, and airports. Facilities, etc. In the present embodiment, a pump room of a power plant is assumed.

  Moreover, as a skeleton member, for example, a well-known H-shaped steel can be used. The size of the skeleton member can be appropriately selected depending on the size of the protection target object X. For example, the depth of the frame 16 shown in FIG. 1 can be set to 5 m to 10 m, the horizontal width of the frame 16 can be set to 5 m or more, and the length of the column member 12 can be set to about 5 m to 10 m. In this embodiment, the skeleton member uses the H-shaped steel of the framework of the pump chamber of the power plant as it is, but is not limited to this.

  The net-like body 20 is not limited to between the beam members 13 (frame members), but also between the column members 10 and 10 at the four corners of the flying object protection barrier 10 and the beam members 13 and 14 (frame members) as shown in FIG. Although it is stretched, the configuration will be specifically described below by taking the top surface of the flying object protection barrier 10, that is, the mesh body 20 stretched between the beam members 13 (frame members) as an example.

  As shown in FIG. 2, the net-like body 20 includes a ring net 25 formed as a net-like body in which a large number of ring members 30 made of a hard steel wire are connected, and flying objects than the ring net 25. And a rhombus metal net 35 that is arranged on the incoming side (that is, the outer side as viewed from the protection target object X) and is formed as a net body in which a plurality of wires made of hard steel wire are knitted.

  In addition, as the mesh body 20 of the flying object protection barrier of this invention, what is necessary is just to have the ring net 25 at least, and the thing which does not have the rhombus metal mesh 35 or another mesh body may be sufficient.

  As shown in FIG. 3, the ring net 25 is formed by connecting one ring member 30 to four other ring members 30 located at adjacent positions in the upper left, upper right, lower left and lower right in the figure. Ring net. Note that one ring member 30 is not limited to being connected to four other ring members 30, and may be connected to, for example, six other ring members 30.

  As shown in FIG. 4, the ring member 30 includes a wound product 30 a made of a wire made of a hard steel wire, and a bundling portion 30 b that bundles several places in the circumferential direction of the wound product. The diameter of the ring member 30 can be changed within a range of 250 mm to 350 mm, for example, and is about 300 mm in the present embodiment.

  The number of windings of the wound object 30a can be set to an arbitrary number according to the assumed properties of the flying object, for example, 5 to 21 times, preferably 9 to 19 times. The bundling portion 30b is formed by, for example, attaching a substantially cylindrical metal fitting with a C-shaped cross section to the winding material 30a through a release portion of the metal fitting at a circumferential position of the winding material 30a, and then using a tightening tool. It can comprise by fixing to 30a.

  As shown in FIGS. 3 and 5, the ring net 25 includes a double ring member unit 33 in which two ring members 30 are overlapped in a region near the frame 16 (frame member). One ring member unit (ring member 30) is connected to each other.

  Thereby, the strength of the ring net 25 in the region near the frame body 16 (frame member) is larger than the strength in the central region. In the present specification, the strength of the ring net 25 means tensile strength.

  As shown in FIG. 6, the rhombus metal mesh 35 is a rhombus metal mesh in which triangular wave wires 36 arranged in parallel and formed in a triangular wave shape in plan view are knitted together at a bent portion 36 a.

  The triangular wave wire 36 is a wire made of a hard steel wire, and has a configuration in which substantially linear straight portions 36b are alternately repeated with the bent portions 36a and extend in one direction spirally.

  As shown in FIGS. 6 and 7, a substantially straight wire 37 made of a hard steel wire is inserted between the bent portions 36a and 36a in the knitting portion 35a between the bent portions 36a. .

In addition, the wire, the triangular wave wire 36, and the substantially linear wire 37 that constitute the wound product 30a of the ring member 30 of the ring net 25 are all made of hard steel wire, and are particularly defined in JIS G 3506. It is made from hard steel wire. From such a hard steel wire, a hard steel wire (JIS G 3521), a galvanized steel wire (JIS G 3548) or the like which is a wire is produced. The materials of these wires may be different or the same. Wire constituting the wound material 30a, the tensile strength of the triangular wire 36 and a substantially straight wire 37, for example, 800~2500N / mm ^2, preferably 1000~2000N / mm ^2, in particular 1200 N / mm ² or more It is advantageous that

  Moreover, the diameter of a wire (elementary wire) can be made into the range of 2.5 mm-5 mm, for example in the case of the rhombus metal-mesh 35, and is 2.5 mm-6 mm in the case of the ring net 25, for example. It can be a range.

  Furthermore, the wire, the triangular wave wire 36, and the substantially linear wire 37 constituting the wound product 30a may be coated as necessary. Thereby, abrasion of the contact part between wires, corrosion, etc. can be prevented. Examples of the coating treatment include galvanizing treatment and polyester coating treatment. It is preferable that any wire is coated.

  The mesh size of the rhombus metal mesh 35 is smaller than the diameter of the ring member 30 of the ring net 25. Specifically, as shown in FIG. 6, the diameter D (see FIG. 6) of the inscribed circle of the rhombus metal mesh 35 only needs to be smaller than the diameter of the ring member 30 of the ring net 25. Furthermore, from the viewpoint of receiving a small-diameter rod-like object or the like, the diameter D of the inscribed circle of the rhombus metal mesh 35 is preferably 65 mm or less, and particularly preferably 50 mm or less. In this case, the mesh of the rhombus metal mesh 35 refers to a triangular mesh formed by a triangular wave wire 36 and a substantially linear wire 37. In the present embodiment, the diameter D of the inscribed circle of the rhombus metal mesh 35 is 48 mm.

  Next, the extension of the ring net 25 and the rhombus metal mesh 35 to the inside of the frame 16 (frame member) will be described.

  As shown in FIG. 2, four wire ropes 40 are stretched across the four sides of the frame 16 in the form of a cross beam. As shown in FIG. 5, the ring member 30 of the double ring member unit 33 is attached to the wire rope 40 via attachment means such as a shackle 42, so that the ring net 25 is attached to the frame body 16 (frame member). ).

  Similarly, as shown in FIG. 6, the rhombus metal mesh 35 is stretched inside the frame 16 (frame member) by attaching the outer edge portion of the rhombus metal mesh 35 via attachment means such as a shackle 42.

  In other words, the ring net 25 and the rhombus metal mesh 35 have predetermined play via the shackle 42 with respect to the wire rope 40 stretched in the shape of a cross on the four sides of the substantially rectangular frame 16 (frame member). (Ie, unfixed).

Moreover, the ring net 25 and the rhombus metal mesh 35 have an initial slack I set to a predetermined distance, as shown in FIG. The initial slack I can be expressed by the difference between the height position of the attachment point of each net 25, 35 to the shackle 42 and the like and the height position of the lowest point of each net in the stretched state. The initial sag can be set within a range of 10 to 20% of the horizontal span of each net 25, 35, and preferably within a range of 15%. In this embodiment, the initial slack _{I 2} initial sagging _{I 1} and rhombus wire mesh 35 of the ring net 25 (12.5% of the lateral span) which is set to about 0.5m, respectively.

  By setting the initial slack I in this way, it becomes possible to more efficiently absorb the kinetic energy of flying objects.

  Further, the wire rope 40 is provided with a buffer means 44 that allows the wire rope 40 to extend in a predetermined range when a load due to flying objects is applied to the mesh body 20 (the ring net 25 and the diamond wire mesh 35). ing.

  The buffer means 44 may be anything as long as it can allow the wire rope 40 to stretch within a predetermined range when a load is applied to the mesh body 20. Is a so-called brake ring having a configuration in which the wire rope 40 is inserted into the ring-shaped steel pipe 44a.

  When a large tension is applied to the wire rope 40, the brake ring is plastically deformed and reduced in diameter so that the steel pipe 44a is squeezed. As a result, the wire rope 40 is allowed to extend within a predetermined range, and the energy of flying objects is absorbed. The

  Next, in the vicinity of the frame 16 (frame member) in the mesh body 20 provided on the top surface of the flying object protection barrier 10 having the above-described structure, steel material such as H-shaped steel having a heavy weight as the flying object Y (length 4). .2 m × width 0.3 m × depth 0.2 m) will be described with reference to FIG. 9 as an example of the action of the flying object protection barrier 10. FIG. 9 shows the flying object protection barrier 10 in a cross section corresponding to the cross section taken along line VIII-VIII in FIG.

  As shown in FIG. 9, the flying object Y collides with the diamond wire mesh 35 located outside the ring net 25, further moves in the direction of the arrow 150 and collides with the ring net 25. At this time, the energy of the flying object Y is distributed and transmitted in the surface spreading direction of the rhombus metal mesh 35 and the ring net 25, and is absorbed by the plastic deformation of the rhombus metal mesh 35 and the ring net 25. However, paying attention to the ring net 25, as shown in the figure, the distance between the collision portion and the wire rope 40 is short, and the number of ring members 30 that can be deformed before the energy of the flying object Y is transmitted to the wire rope 40. Therefore, the energy absorption of the flying object Y due to the deformation of the ring member 30 becomes insufficient, and there is a concern about the concentration of stress on each ring member 30 of the collision part and the attachment part from the collision part to the nearest wire rope 40. Is done.

  However, according to the present embodiment, the ring net 25 in the region near the frame 16 (frame member) is stronger than the central region due to the interconnection of the double ring member units 33, so that the collision part Further, it is possible to prevent the ring net 25 from being broken due to the concentration of stress from the collision portion to the attachment portion to the nearest wire rope 40.

  The ring net 25 and the rhombus metal mesh 35 each have a predetermined play via a shackle 42 with respect to the wire rope 40 stretched in the form of a girder on the four sides of the substantially rectangular frame 16 (frame member). Even if the flying object Y collides with the vicinity of the frame body 16 (frame member), the ring net 25 and the wire rope 40 are attached to the wire rope 40. The rhombus wire mesh 35 is allowed to slide slightly in the extending direction of the wire rope 40.

  Therefore, it is possible to avoid stress concentration at the attachment portion of the ring net 25 and the rhombus metal mesh 35 to the wire rope 40, and breakage of each net 25, 35 and / or wire rope 40 due to this stress concentration.

  Further, since the wire rope 40 is provided with the buffer means 44, when the flying object Y collides with the region near the frame body 16 (frame member), the buffer rope 44 allows the wire rope 40 to be extended. As shown in FIG. 9, the position of the wire rope 40 moves in the direction of the arrow 250 to absorb the energy of the flying object Y, and the stress from the collision part and the attachment part to the nearest wire rope 40 from the collision part is reduced. Breakage of the ring net 25 due to concentration can be prevented more effectively.

  In addition, as described above, the strength of the ring net 25 in the region near the frame body 16 (frame member) is improved by the interconnection of the double ring member units 33, so the standard of the ring member 30 itself is changed. In addition, the work of changing the strength of the ring net 25 is simpler.

  In the center region of the ring net 25, the energy absorption effect due to many deformations of the ring member 30 can be obtained from the collision part to the attachment part of the ring net 25 via the shackle 42 as in the past. It is not necessary to increase the strength of the ring net 25 in the region to the strength in the vicinity of the frame body 16 (frame member), and thereby the energy absorption performance of the ring net 25 is optimized.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention. For example, in the present embodiment, by adopting the double ring member unit 33 as the ring member 30 in the region near the frame body 16 (frame member), the strength of the ring net 25 in the region near the frame member is more than that in the central region. However, it is not limited to this.

  For example, in the region near the frame body 16 (skeleton member), as the ring member 30, the number of windings of the wound object 30 a is made larger than the number of windings of the wound object 30 a in the central region of the ring net 25. The strength of the ring net 25 in the member vicinity region may be larger than that in the central region.

  Specifically, the number of turns of the wire 30a of the wound member 30a of the ring member 30 in the region near the skeleton member of the ring net 25 is set to 1 with respect to the number of turns of the wire 30a of the wound member 30a of the center region. .2 times to 2.0 times, preferably 1.5 times to 2.0 times.

  Thereby, by receiving the energy of the flying object Y by the ring net 25 more reliably, the number of windings of the wound object 30a is changed according to the required strength of the ring member 30 in the ring net 25. be able to.

  In the present embodiment, as the ring member unit, the double ring member unit 33 in the region near the skeleton member of the ring net 25 and the single ring member unit (ring member 30) in the central region are employed. It is not limited to this.

  That is, as long as the number of overlapping ring members 30 constituting the ring member unit in the region near the skeleton member of the ring net 25 is larger than that of the ring member 30 constituting the ring member unit in the central region, any ring member can be used. Units may be adopted.

  Furthermore, in the present embodiment, the ring net 25 is stretched inside the frame body 16, but is not limited to this. The ring net 25 is stretched on a skeletal member fixed and set outside the protection target X. It can be anything as long as it is passed.

  For example, an upper wire rope and a lower wire rope are respectively stretched between the upper end and lower end of a pair of struts fixed to the ground as a skeleton member, and a ring is connected between the upper wire rope and the lower wire rope. The net 25 may be stretched over.

  The fact that such a configuration change is possible applies not only to the ring net 25 but also to other nets such as the rhombus metal net 35.

  Further, in the present embodiment, the rhombus metal mesh 35 is employed in addition to the ring net 25, but a net body having another mesh shape such as a turtle shell metal mesh can be employed instead of the rhombus metal mesh 35.

  Furthermore, in addition to the rhombus metal mesh 35, a third net body may be added to the side from which the flying object comes from the rhombus metal mesh 35 (that is, the outside as viewed from the object to be protected).

  The third mesh body is a knitted mesh body formed as a mesh body in which a plurality of wires made of hard steel wire are knitted, like the rhombus wire mesh 35. Although what kind of thing may be used as a 3rd mesh body, it is advantageous from a viewpoint of the manufacturing efficiency of a flying object protection barrier to use the same metal mesh as the rhombus metal mesh 35. FIG.

Moreover, in the above embodiment, the initial slack _{I 2} initial sagging _{I 1} and rhombus wire mesh 35 of the ring net 25 is set to the same range of 10-20% of the lateral span of each net 25, 35 For example, the initial slack I ₁ of the ring net 25 may be larger than the initial slack I ₂ of the rhombus metal mesh 35. According to this, the energy absorption mode of the flying object can be changed.

10 Flying object protection barrier 15 Frame member 25 Ring net 30 Ring member (ring member unit)
30a Rolled object 30b Bundling part 33 Double ring member unit (multiple ring member unit)
35 Diamond wire mesh 36a Bent part 37 Wire of substantially straight line 40 Wire rope 44 Buffering means

Claims (6)

In a flying object protection barrier provided outside the protection object and protecting the protection object from flying objects,
A skeletal member fixed and installed outside the object to be protected;
A ring net formed by connecting a plurality of ring members made of wires made of hard steel wire, stretched between the skeleton members,
A flying object protection barrier characterized in that the strength of the ring net is set larger in a region near the skeleton member than in a central region. The connection of the ring members is an interconnection of multiple ring member units formed by overlapping one ring member unit and / or two or more ring members,
2. The ring net according to claim 1, wherein the number of overlapping ring members constituting the ring member unit in the region near the skeleton member is set larger than that of the ring member constituting the ring member unit in the central region. The flying object protection barrier described in 1. The ring member has a wound product made of a wire made of a hard steel wire, and a bundling portion that bundles several places in the circumferential direction of the wound product,
2. The flying object according to claim 1, wherein the ring net is set such that the number of windings of the ring member in the region in the vicinity of the skeleton member is set larger than that of the ring member in the central region. Protective barrier. The ring net is attached in a non-fixed state to a wire rope stretched between the skeleton members,
4. The buffering means according to claim 1, wherein the wire rope is provided with a buffer means that allows the wire rope to extend within a predetermined range when a load is applied to the ring net. 5. The flying object protection barrier according to item 1. Between the skeleton members, the ring net is stretched over the position to be protected with respect to the object to be protected, and has a rhombus wire mesh made of a wire made of a hard steel wire,
The flying according to any one of claims 1 to 4, wherein a substantially straight wire made of a hard steel wire is inserted between the bent portions of the knitted portion of the rhombus wire mesh. Object protection barrier. The flying object protection barrier according to claim 1, wherein the wire has a tensile strength of 800 to 2500 N / mm ² .

Images