JP6518412B2 - Protective structure - Google Patents

Description

  The present invention relates to protective structures. More particularly, the present invention relates to a protective structure used to protect a building, a warehouse, a power supply facility and the like from external shocks.

In Japan, strong winds are generated each year as typhoons approach and land on the ground, and such strong winds cause damage such as collapse of buildings and trees.
However, although strong winds caused by typhoons may have a maximum wind speed of 60 m / s or more, such strong winds may cause collapse of houses and trees, but they may have collapsed structures (such as steel frames). There is no energy for scattering heavy objects.
For this reason, in the past, the mainstream of measures against strong winds in Japan was to weaken the wind blowing on a building with a windbreak or the like, or to increase the strength of the building to prevent collapse due to wind pressure.

  On the other hand, if a tornado occurs, it may have more energy than a typhoon, and if its wind speed is 70 m / s or more (F3 or more tornado), there is a possibility that the structure of the collapsed structure or car may be scattered. is there. In the United States, etc., a large tornado occurs every year, and a large damage is caused by a structure or the like scattered by the large tornado.

  Although the occurrence of tornadoes is also seen in Japan, the scale of the tornadoes that have been generated up to now is relatively small, and it is the fact that no special measures have been taken against them.

  However, in recent years, a large tornado has been generated in Japan as well, and the tornado has caused great damage. For example, a tornado winds up a structure (such as a roof or wall) or a car, etc., and the structure or car collides with the structure, causing the building to collapse or be damaged. ing. For this reason, even in Japan, when a large tornado is generated and a structure or the like of a structure is scattered, the scattered structure or the like (hereinafter referred to as a flying object) collides with the structure or the like and collapses or breaks the structure Measures to prevent the damage of

  By the way, when an object collides with a building from the outside, etc., it is common practice to provide a protective wall as a technique for preventing damage to the building. Although a concrete wall etc. are employ | adopted in many cases as this protective wall, in the case of installing a concrete wall, since the weight becomes very large, foundation work is needed in order to install stably. Then, the construction of the protective wall takes time and effort, and the place where the protective wall can be installed is limited to the place where the foundation can be constructed.

  Then, techniques as shown in patent documents 1 and 2 are developed as a protection wall which does not use concrete.

  For example, Patent Document 1 discloses a protective wall disposed between a road and a building. The protective wall sandwiches the honeycomb panel between a pair of plate-like members, and describes that the axial direction of the cells of the honeycomb panel is disposed in parallel with the road surface. Therefore, Patent Document 1 describes that when the vehicle or the like collides with the protective wall, the impact can be absorbed by deformation of the honeycomb panel in the axial direction of the cell.

  In addition, Patent Document 2 is an impact absorbing device installed in a structure to be protected such as a bridge girder, and has a structure in which a large number of buffer members having hollow sectional members of small diameter assuming axial deformation are provided in parallel. Objects are disclosed. Further, in Patent Document 2, energy is absorbed in the process of plastic buckling or deformation of the buffer member, so that the load transmitted to the portion to be protected can be reduced, and the structure to be protected As it can be directly supported, it is stated that it does not require the installation space such as the foundation or the support.

JP-A-8-199521 JP 2007-205046 A

However, the techniques of Patent Documents 1 and 2 assume at most an impact that a car is self-propelled and collided, and the impact absorption in the case of collision with a high penetrating force such as steel is assumed. I did not.
That is, even if the techniques of Patent Documents 1 and 2 are adopted, when a high penetrating material such as steel material flies toward a building or the like, it is possible to receive such flying material and absorb its impact force. It is impossible at all.

  As mentioned above, a protective wall formed without using concrete, which can absorb the impact force when a high penetrating flying object collides, has not been developed at present, and such a protective wall Development of a structure capable of constructing such a protective wall is desired.

  An object of the present invention is to provide a protective structure capable of absorbing an impact force even in the event of a collision with a high penetrating force, in view of the above circumstances.

The protective structure according to the first aspect of the invention is a protective structure that absorbs impact from high impact penetrating objects, thereby protecting buildings such as buildings, warehouses, and power supply facilities. a frame body having a skeleton was, attached to the rear surface of the frame body so as to cover the opening in the frame body comprises a cover member of high strength wire mesh, and the high strength wire mesh, its periphery A reinforcing cover formed of a metal plate member is attached so as to cover an opening located at a peripheral portion of the frame and connected to a peripheral portion of the frame .
Protective structure of the second invention is the first invention, before Kiwakutai is characterized by a combination of shaft-like member having high rigidity than the cover member and is formed in a lattice shape.
In the protective structure of the third invention , in the first or second invention , the frame is formed by combining H-shaped steels, and the H-shaped steels are H having a thickness of 3 to 15 mm of a plate material. The shaped member is characterized in that the cover member is a metal plate having a thickness of 2 to 6 mm .
In the protective structure of the fourth invention , in the first, second or third invention , the frame of the frame has an opening width of 1 to 1.5 m and an opening height of 1 to 1. It is characterized in that it is formed to be 5 m.
In the first, second, third or fourth inventions , the protective structure of the fifth invention is formed into a wall shape and installed at a fixed distance from the outer surface of the structure to be protected and / or the structure It is characterized by

According to the first aspect of the present invention, when a large-size flying object collides, the flying object can be received by the frame body, and the collision energy of the flying object can be absorbed by the deformation of the frame body. Moreover, the flying object of the magnitude | size which can pass the opening of a frame can be received by a cover member, and the deformation energy of a cover member can absorb the collision energy of a flying object. Therefore, if the protective structure is placed around, in front of, or on the top of a building, etc., it is possible for the protective structure to catch flying objects with high penetration power , and the flying objects collide with the structure etc. It can be prevented. In addition, since the frame is formed in a lattice and the cover member is provided to cover the opening in the frame, the entire protective structure is formed of a plate material or the protective structure is a concrete structure. Compared with this, it is possible to reduce the weight and to reduce the number of installation steps while making the impact absorbing performance high . In addition, since the cover member is a high-strength wire mesh, even if the protective structure is installed, the air permeability can be maintained substantially equivalent to the state where the protective structure is not installed.
According to the second aspect of the invention , since the shaft-like member which is higher in rigidity than the cover member is formed in combination, the strength of the frame can be increased.
According to the third aspect of the present invention , it is possible to absorb collision energy while suppressing the amount of deformation when flying objects collide at a speed of about 60 m / s while reducing the weight of the protective structure.
According to the fourth aspect of the invention , a large flying object having a large collision energy can collide with the frame and receive the impact by the frame.
According to the fifth invention , since the flying object can be received by the protective structure, it is possible to prevent the flying object from colliding with a structure or the like, or to reduce the impact applied to the structure or the like.

It is a schematic front view of the protective structure 1 of this embodiment. It is the IIB-IIB line expanded sectional view of FIG. It is a partial schematic perspective view of protection structure 1 of this embodiment. It is a schematic explanatory drawing of the use condition of the protective structure 1 of this embodiment. It is a schematic front view of protective structure 1B of other embodiment. It is a schematic rear view of protective structure 1B of other embodiment. It is the VIIB-VIIB line expanded sectional view of FIG. It is a partial schematic perspective view of protective structure 1B of other embodiment. It is a schematic explanatory drawing of the use condition of protection structure 1B of other embodiment. It is a schematic explanatory drawing of the model used for the Example. It is explanatory drawing of the calculation conditions of an Example, (A) is explanatory drawing of a flying object, (B) It is explanatory drawing of the collision condition of a flying object. It is the figure which showed the calculation result of the Example. It is the graph which showed the calculation result of the example.

  The protective structure of the present invention is installed near or around facilities in a thermal power plant, a nuclear power plant, a manufacturing plant, etc. To prevent

  The equipment protected by the protective structure of the present invention is not particularly limited. For example, a pump, a tank, a fan, piping, etc. provided at the outside or opening of a building can be mentioned.

(Protected structure 1 of the present embodiment)
First, the structure and usage of the protective structure 1 of the present embodiment will be briefly described.
As shown in FIG. 1, the protective structure 1 of this embodiment is a substantially plate by a frame 2 having a framework provided in a lattice and a cover member 5 attached to the front and back of the frame 2. It is a structure formed into a shape. Moreover, the cover member 5 is attached so as to cover the opening of the frame of the frame 2.

  Such a protective structure 1 is provided to protect a protected facility PO disposed at an opening of a building BLD or the like from airborne matter, as shown in FIG.

  For example, as shown in FIG. 4, it is assumed that a space h recessed from the side surface SF is formed on the side surface SF of the building BLD, and the facility PO is disposed in the space h. In this case, the space h communicates with the outside only at the opening c provided on the side surface SF.

  In such a case, the protective structure 1 is disposed to cover the opening c. At this time, the protective structure 1 is installed at a certain distance (for example, about 1 m) away from the facility PO.

  Then, even if flying objects are flying toward the equipment PO by a tornado or the like, the flying objects can be received by the protective structure 1, so that damage to the equipment PO due to flying materials can be prevented.

  Specifically, large flying objects such as automobiles can be received by the frame 2. On the other hand, a flying object (for example, a steel frame) or the like having a cross section smaller than the opening of the frame of the frame 2 can be received by the cover member 5 attached so as to cover the opening of the frame of the frame 2.

  And, even when the cover member 5 is deformed or the frame 2 is deformed (that is, when the protective structure 1 itself is deformed) by the impact of flying objects, the protective structure 1 is separated from the facility PO by a fixed distance. Therefore, the deformed protective structure 1 can be prevented from coming into contact with the facility PO.

  As described above, if the protective structure 1 is provided outside the facility PO, in other words, so that the facility PO does not become exposed from the outside, even if flying objects fly toward the facility PO in the space h. It is possible to prevent the facility PO from being damaged by flying objects.

  Moreover, since the framework forming the frame 2 has a lattice shape, the protective structure 1 is in a state of having a certain amount of space inside. For this reason, compared with the case where the protective structure 1 whole is formed with a board | plate material, or the protective structure 1 is made into a concrete structure, making the protective structure 1 lightweight is made into a state which makes impact absorption performance high. it can. Then, the foundation work required for the installation of the protective structure 1 does not become large scale, so the restriction on the place where the protective structure 1 is installed is reduced, and the number of operation steps for installing the protective structure 1 is also reduced. it can.

  In addition, when installing the protective structure 1, the distance in particular from the protective structure 1 to installation PO is not limited. It may be appropriately set according to the impact absorption performance of the protective structure 1 and the installation environment of the facility PO. In other words, when the protective structure 1 is deformed by the impact of an expected flying object, the protective structure 1 may be installed at such a distance that the protective structure 1 does not contact the facility PO even if the protective structure 1 is deformed. .

  Further, the size of the protective structure 1 is not particularly limited, and may be formed in an appropriate size according to the installation place and the equipment PO to be protected. For example, if the facility PO disposed in the opening of the building BLD or the like is a pipe, the size of the protective structure 1 may be formed to be about 3 m × 2 m to 5 m × 11 m. Further, if the facility PO is a fan, the size of the protective structure 1 may be about 2 m × 3 m to 2.5 m × 3 m.

  Further, the shape of the protective structure 1 is not particularly limited, and may be formed in an appropriate shape according to the installation place and the equipment PO to be protected. Although a rectangular example is disclosed as the protective structure 1 in FIG. 1, the protective structure 1 may be a polygon such as a triangle, a pentagon, or a hexagon, or may be a circle, an ellipse, or the like.

(Detailed Description of Protective Structure 1 of the Present Embodiment)
Below, the protection structure 1 of this embodiment is demonstrated in detail.
In addition, although the case where the protection structure 1 is a rectangle is demonstrated as a representative below, as above-mentioned, the shape of the protection structure 1 is not limited to a rectangle.

  As described above, the protective structure 1 of the present embodiment has a certain thickness by the frame 2 having a framework provided in a lattice and the cover members 5 attached to the front and back of the frame 2. It is a plate-like (or wall-like) structure having a length.

(Frame 2)
The frame 2 is composed of an outer frame 4 and an inner frame 3 provided in a lattice shape in the outer frame 4.

(Outer frame 4)
The outer frame 4 is formed into a substantially rectangular shape by combining a square steel pipe, an H-shaped steel and the like. When the protective structure 1 of the present embodiment is fixed to the side surface SF or the like of the building BLD, an attachment member BL connecting the protective structure 1 and the side surface SF is attached to the outer frame 4. For example, in the case of FIG. 4, the attachment members BL are fixed to the four corners of the outer frame 4 and the protective structure 1 is installed on the side surface SF.

(Inner frame 3)
The inner frame 3 is formed by combining a plurality of shaft-shaped members 3A and 3B. A member having rigidity higher than that of the cover member 5 is used for the shaft-like members 3A and 3B. Specifically, the shaft-like member has such a rigidity that the cover member 5 is deformed prior to the framework of the frame 2 when a force is applied to the protective structure 1 in the thickness direction. It is used as 3A and 3B.

  As shown in FIGS. 1 to 3, the inner frame 3 is formed in a lattice shape by combining a plurality of axial members 3 </ b> A and 3 </ b> B. That is, the inner frame 3 is formed to have a through hole penetrating the front and back (in the left and right direction in FIG. 2). For example, the inner frame 3 is formed such that the width of the opening (horizontal direction in FIG. 1) is 1 to 1.5 m, and the height of the opening (vertical direction in FIG. 1) is 1 to 1.5 m. It is done. Then, when a large flying object such as a car collides with the protective structure 1, the large flying object can be received by the frame 2, and the impact of the collision can be absorbed by the deformation of the frame 2. That is, the impact due to the collision of the large flying object can be received by the shaft-shaped members 3A and 3B of the inner frame 3 which is higher in rigidity than the cover member 5. Then, as compared with the case where the impact of a large flying object is received by the cover member 5, the impact absorbing performance of the protective structure 1 when the large flying object collides can be enhanced.

  In addition, the size of the through hole, that is, the size of the opening is not limited to the above size, and among the assumed flying objects, according to the size of the flying objects scheduled to be received by the frame 2 It may be set appropriately.

(Cover member 5)
As shown in FIGS. 1 to 3, a pair of cover members 5 a and 5 b is attached to the front surface and the back surface of the frame 2. The pair of cover members 5a and 5b are plate-like members. The material of the pair of cover members 5a and 5b is formed of a material having a certain degree of rigidity and toughness, for example, a metal such as stainless steel or iron. In other words, the pair of cover members 5a and 5b are formed to have a function that can be deformed when an impact or the like is applied to absorb the impact, and prevent an object from penetrating even if an object or the like collides. -ing

  As shown in FIGS. 1 to 3, the pair of cover members 5 a and 5 b are formed so as to be substantially similar to the opening of the framework of the frame 2 and slightly larger than the opening. The pair of cover members 5 a and 5 b is provided to close the opening of the framework of the frame 2. That is, the pair of cover members 5a and 5b are attached to the frame of the frame 2 so that a box-like structure having a hollow space 2h is formed by the pair of cover members 5a and 5b and the frame of the frame 2 (See Figure 3).

For example, as shown in FIG. 2 and FIG. 3, it is assumed that the shaft-like members 3A and 3B of the inner frame 3 of the frame 2 are formed of H-shaped steel. In this case, the cover members 5a and 5b are arranged such that their respective end edges lie on the flanges 3f (four flanges 3f) of the shaft-like members 3A and 3B located around the opening. Be done. The end edges of the cover members 5a and 5b are fixed to the flange portions 3f of the shaft-like members 3A and 3B by welding, bolts or the like. Then, a box-like structure having a hollow space 2h is formed by the two axial members 3A, the two axial members 3B and the pair of cover members 5a and 5b.
Of course, at the periphery of the protective structure 1, the outer frame 4 is a component of a box-like structure instead of the part of the shaft-like member 3A or the shaft-like member 3B.

  As described above, in the protective structure 1 of the present embodiment, the frame 2 and the cover member 5 have a structure in which a plurality of box-like structures are formed. Therefore, the frame 2 can receive large flying objects such as automobiles. In addition, flying objects (for example, steel frames) or the like having a cross section smaller than the opening of the framework of the frame 2 can be received by the cover member 5.

  Further, since the protective structure 1 has a plurality of box-like structures formed by the frame 2 and the cover member 5, it is possible to increase the shock absorbing performance while being lightweight. In addition, the amount of deformation of the protective structure 1 can be suppressed to a small amount at the time of shock absorption. Then, the distance between the protective structure 1 and the object to be protected (the facility PO in FIG. 4) does not have to be wide, so the degree of freedom such as the location and position of the protective structure 1 can be increased. In other words, it can be used in various places.

  For example, it is assumed that the protective structure 1 is formed in a wall shape having a size of 8 m × 6 m to 8 m × 8 m and a thickness of 150 to 300 mm. At this time, the inner frame 3 of the frame 2 is formed by combining lightweight H-shaped steels each having a thickness of 3 to 6 mm, a flange 3 f having a width of 75 to 85 mm, and a web 3 w having a height of 150 to 250 mm. Further, the outer frame 4 is formed using a square steel pipe of 150 mm × 150 mm × 4.5 mm to 250 mm × 150 mm × 9 mm, H150 mm × 150 mm × 3.2 mm × 4.5 mm H-shaped steel. Then, as the cover member 5, a plate made of metal (made of iron) (thickness: 2 to 6 mm) is used. In this case, the weight of the protective structure 1 can be suppressed to about 3 to 4 t.

  Moreover, even if about 2 t of car collides as a flying object by a wind wind of 100 m / s class wind speed, deformation of the protective structure 1 (the amount of depression in the thickness direction, in the case of FIG. The protrusion amount can be suppressed to about 700 to 900 mm.

  That is, in the protective structure 1 according to the present embodiment, the above-described configuration can significantly reduce the weight as compared with the case of using a plate or concrete wall having the same size and thickness, and The amount of deformation at the time of collision as a flying object can also be reduced.

(About inner frame 3)
It has been described that the inner frame 3 is formed by combining a plurality of shaft-shaped members 3A and 3B. In the present specification, an axial member means a member whose axial length is longer than the width and height of its cross section. For example, as shown in FIG. 2, when the shaft-like members 3A and 3B are H-shaped steel, the axial direction (FIG. 2) is better than the width of the flange 3f and the height of the web 3w. For example, a member having a long length in the direction perpendicular to the sheet of the drawing, in the vertical direction or the horizontal direction in FIG.

In FIG. 2 and FIG. 3, the case where H-section steel is used as axial-shaped members 3A and 3B is demonstrated. However, the axial members 3A and 3B may be those having the above-described structure and performance, and the cross-sectional shape, width, height and the like thereof are not particularly limited. For example, L-shaped steel (angle member), square steel pipe, circular steel pipe, grooved steel (channel material) or the like can be adopted as the shaft-shaped members 3A and 3B.
In particular, it is preferable to use a lightweight H-shaped steel, because the weight of the frame 2 can be reduced while maintaining the rigidity, and the manufacturing of the protective structure 1 can be facilitated.

  The shaft-like members 3A and 3B may have the same structure (the same cross-sectional shape), or the shaft-like member 3A and the shaft-like member 3B may have different cross-sectional shapes. Moreover, you may change the axial member used by a position.

  When the frame 2 is formed using the same cross-sectional shape as the shaft-like members 3A and 3B, in the protective structure 1, the frame surrounded by the shaft-like members 3A and 3B has any The same strength and the same shock absorbing performance can be obtained at the position.

  On the other hand, the protective structure 1 can be adjusted to a desired strength and shock absorbing performance by changing the properties (for example, rigidity, cross sectional shape, etc.) of the shaft-like member to be used depending on the position. For example, as shown in FIGS. 1 to 3, the axial member 3A is disposed such that its axial direction is parallel to the width direction of the protective structure 1, and the axial member 3B has a height in the axial direction. Consider the case of being disposed parallel to the direction. In this case, if the rigidity of the shaft-shaped member 3B is stronger than that of the shaft-shaped member 3A, displacement (flexure) in the width direction can be increased as compared to the height direction. Conversely, if the rigidity of the shaft-shaped member 3A is stronger than that of the shaft-shaped member 3B, the displacement (deflection) in the height direction can be increased compared to the width direction.

  Furthermore, in the case where high rigidity axial members 3A and 3B are used in the peripheral portion of the protective structure 1 and low rigidity axial members 3A and 3B are used in the central portion of the protective structure 1, It is possible to improve the shock absorbing performance of the part. On the contrary, in the case of using the highly rigid shaft-like members 3A and 3B in the central portion of the protective structure 1 and using the low-rigid shaft-like members 3A and 3B in the peripheral portion of the protective structure 1, The shock absorbing performance of the central portion can be improved.

  Further, the method of forming a lattice-like framework by combining a plurality of shaft-like members 3A and 3B is not particularly limited. For example, as shown in FIG. 1, long shaft-like members 3 B are arranged side by side at intervals along the width direction of the outer frame 4. Then, the short axial members 3A are spaced along the height direction of the outer frame 4 so as to connect the adjacent axial members 3B (or between the axial member 3B and the outer frame 4). Install. By doing this, the lattice-like inner frame 3 can be formed by the plurality of shaft-like members 3A and 3B. Of course, the long shaft-like members 3A are arranged side by side at intervals along the height direction of the outer frame 4, and between adjacent shaft-like members 3A (or between the shaft-like members 3A and the outer frame 4) ) May be formed at intervals along the width direction of the outer frame 4 to form the grid-like inner frame 3. Alternatively, the grid-like inner frame 3 may be formed by combining the short shaft-like member 3A and the short shaft-like member 3B. However, in order to increase the rigidity of the inner frame 3, the long shaft-like member 3B (or the long shaft-like member 3A) and the short shaft-like member 3A (or the short shaft-like member 3B) It is desirable to form the inner frame 3 by combining

Further, the intervals between the adjacent axial members 3A and the intervals between the adjacent axial members 3B may be equal intervals, or the intervals may be changed depending on the place. By adjusting the spacing, the protective structure 1 can be formed to have the desired strength and the desired shock absorbing performance. For example, in the portion where the distance is narrowed, the rigidity of the protective structure 1 is increased, and the deformation amount of the protective structure 1 can be reduced. On the contrary, in the part which made the space | interval wide, the rigidity of the protective structure 1 becomes small and the deformation amount of the protective structure 1 can be enlarged.
Then, the distance between the adjacent shaft-like members 3A and the distance between the adjacent shaft-like members 3B may be changed according to the size of the expected flying object. For example, in the case where the expected flying object is a car, it is desirable to narrow the interval. On the contrary, in the case where the assumed flying object is a steel material (iron pipe, square steel pipe, etc.), it is desirable to widen the distance.

  Furthermore, in FIGS. 1 to 3, the axial direction of the axial member 3A is parallel to the width direction of the protective structure 1, and the axial direction of the axial member 3B is parallel to the height direction of the protective structure 1 Is explained. However, the axial direction of the axial member 3A may be inclined with respect to the width direction of the protective structure 1, and the axial direction of the axial member 3B is inclined with respect to the height direction of the protective structure 1 May be The shaft-shaped member 3A and the shaft-shaped member 3B may not necessarily be orthogonal to each other. However, as shown in FIGS. 1 to 3, the axial direction of the axial member 3 A is parallel to the width direction of the protective structure 1, and the axial direction of the axial member 3 B is the height direction of the protective structure 1. By arranging so as to be parallel to, it becomes easy to manufacture a housing (that is, a box-like structure).

  Moreover, in the said example, the case where rigidity of the shaft-shaped members 3A and 3B was higher than the rigidity of the cover member 5 was demonstrated. However, when the assumed flying objects are not assumed to be large such as automobiles, etc., and the assumed flying objects are only steel materials (iron pipes, square steel pipes, etc.), the shaft-shaped member 3A , 3B may be as rigid as the cover member 5.

(About outer frame 4)
In the said example, the case where square steel pipe and H-shaped steel were used as a member which comprises the outer frame 4 was demonstrated. However, the member which comprises the outer frame 4 is not limited to a square steel pipe, A various member can be used. For example, an L-shaped steel (angle), a circular steel pipe, a grooved steel (channel material) or the like can be adopted as a member constituting the outer frame 4.

  Further, as described above, since the outer frame 4 also functions as a fixing member fixed to the protective structure 1 and the side surface SF, the members constituting the outer frame 4 have higher rigidity than the cover member 5 Of course, it is desirable to use a member having a rigidity equal to or greater than or equal to the member constituting the inner frame 3. However, when the expected flying objects are only steel materials (iron pipes, square steel pipes, etc.), the same rigidity as that of the cover member 5 may be used as the member constituting the outer frame 4. Good.

  Further, in the above example, the case where the outer frame 4 is rectangular is described because the protective structure 1 is rectangular. However, the outer frame 4 is not limited to a rectangular shape, and the outer frame 4 may be formed into an appropriate shape in accordance with the shape of the protective structure 1.

(Cover member 5)
Although FIG. 1-FIG. 3 demonstrated the case where a pair of cover members 5a and 5b were attached to each opening one each (two sheets on the front and back), the size in particular of a pair of cover members 5a and 5b is not limited . For example, the cover members 5a and 5b may be formed to have a size that can cover a plurality of openings, or the cover members 5a and 5b may be formed to a size that allows the entire frame 2 to be covered by one sheet. You may form. However, when the pair of cover members 5a and 5b is provided in each opening, it becomes easy to manufacture a box-like structure. In addition, in the case where a plurality of openings are covered by one cover member 5a, 5b, the shock absorbing performance can be improved.

  When a plurality of openings are covered by one cover member 5a, 5b, only the peripheral portion of one cover member 5a, 5b may be connected to the frame 2, The frame 2 may be connected to the cover members 5a and 5b at the periphery of the opening. When only the peripheral part of one cover member 5a, 5b is connected to the frame 2, the shock absorbing performance can be improved. On the other hand, when the frame 2 is connected to the cover members 5a and 5b at the periphery of each opening, the rigidity of the protective structure can be improved.

  Moreover, although the case where a metal board was used as a pair of cover members 5a and 5b was explained in the above-mentioned example, a pair of cover members 5a and 5b are not restricted to a metal board, but when a flying object collides The plate material may be made of a material that can be deformed to absorb the impact.

(Other embodiments)
In the above-mentioned example, plate-like members were provided on the front and back sides of the frame 2 as the cover member 5, and the case where the box-like structure was formed in the protective structure 1 was described.
However, the protective structure 1 may not necessarily have a box-like structure, and the following structure may be employed.
In addition, below, the description regarding the structure common to the protection structure 1 mentioned above is omitted suitably.

  As shown in FIGS. 5 to 8, the protective structure 1 </ b> B includes a frame 2 having an inner frame 3 and an outer frame 4. The frame 2 has substantially the same structure as that of the protective structure 1 described above. That is, the frame 2 has the inner frame 3 formed in a lattice shape in the outer frame 4 by combining a plurality of shaft-shaped members 3A and 3B.

  As shown in FIGS. 5 to 8, in the protective structure 1B, unlike the protective structure 1 described above, the cover member 6 made of high-strength wire mesh is attached to the back surface of the protective structure 1B. The cover member 6 is provided so as to cover the entire back surface of the protective structure 1B, and only its peripheral edge portion is connected to the outer frame 4 of the frame 2 or the inner frame 3 near the outer frame 4.

  With this configuration, large flying objects can be received by the inner frame 3 in the same manner as the protective structure 1, and flying objects passing through the opening (through hole) of the inner frame 3 is the cover member 6. It can be received by the strength wire mesh. The high strength wire mesh is excellent in deformability, so that when the high strength wire mesh collides with the flying object, the high strength wire mesh can be deformed so as to bend and absorb the impact that the flying object collides.

  Moreover, since only the peripheral edge portion of the high strength wire mesh is connected to the peripheral edge portion of the frame 2, the deformation amount of the high strength wire mesh can be increased. Therefore, the collision energy absorption performance of flying objects due to the deformation of the high-strength wire mesh can be enhanced. That is, when a flying object (a flying object which can not be captured by the frame 2) flies toward the protective structure 1B, the protective structure 1B captures the flying object and enhances its ability to absorb the collision energy. It is possible to

  As shown in FIGS. 5, 7, and 8, even if the reinforcing cover 7 made of a plate material made of metal is attached to the protective structure 1B so as to cover the opening located at the peripheral portion of the frame 2. Good. If such a reinforcing cover 7 is provided, flying objects that collide with the peripheral portion of the protective structure 1B can be received by the reinforcing cover 7 instead of the cover member 6 (high-strength wire mesh). At the peripheral portion of the frame 2, the deformation amount of the high strength wire mesh is smaller than that at the central portion, so that the shock absorbing performance by the high strength wire mesh is lowered. However, by providing the reinforcing cover 7, it is possible to enhance the ability to capture flying objects and absorb impact also at the periphery of the frame 2, that is, the periphery of the protective structure 1 B. The reinforcing cover 7 may be fixed to the frame 2 by the same method as the method for fixing the cover member 5 of the protective structure 1 to the frame 2 described above.

(Example of use of protective structure 1B)
Since the protective structure 1B described above uses a high-strength wire mesh as the cover member 6, the air permeability of the front and back of the protective structure 1B can be made higher than that of the protective structure 1. Therefore, the protective structure 1B is suitable as a structure for protecting a facility PO requiring air permeability.

  For example, as shown in FIG. 9, consider the case of protecting a facility PO disposed inside a pit P or the like. In the case of FIG. 9, although the facility PO can be protected by closing the opening of the pit P, the inside of the pit P is sealed or it is difficult to ventilate. If the equipment PO generates heat by operation such as a pump (driven by a motor), the heat generated by the operation of the equipment PO can not be dissipated to the outside. Then, the temperature inside the pit P may rise, and the facility PO may be damaged by heat.

  On the other hand, in the case of the protective structure 1B described above, as shown in FIG. 9, even if the protective structure 1B is installed on the fixing frame BL, etc., the cover member 6 is a high strength wire mesh, so pits P Air permeability between the inside and outside is maintained. That is, even if the protective structure 1B is installed, the air permeability inside the pit P is maintained substantially equivalent to the state where the protective structure 1B is not installed.

  Therefore, when protecting facility PO where air permeability and ventilation are important, by using protective structure 1B, flying facility PO is maintained while maintaining the same environment as in the case where protective structure 1B is not provided. Can be protected from

  In addition, even if the protective structure 1 has a certain degree of air permeability (for example, a punching plate or the like) as the cover member 5, it is possible to have air permeability of the front and back.

  In order to confirm the collision energy absorption performance of the protective structure of the present invention, the deformation state of the protective structure in the case where an impactile collides with the protective structure (building wall) was confirmed by numerical simulation.

In the numerical simulation, a collision evaluation model (FIG. 10) having a structure equivalent to that of the above-described protective structure 1 is formed, and a flying object simulating a car is made to collide with the collision evaluation model at an initial speed of 47 m / s. The deformation state of the collision evaluation model was confirmed.
In addition, the collision evaluation model was made into the state arrange | positioned in the position 900 mm away from the wall surface used as protection object, in the state connected with protection object by eight fixing | fixed parts.

  For numerical simulation, dynamic finite element analysis code (LSDYNA) was used as simulation software.

The collision assessment model and the aircraft used are as follows.
(Collision evaluation model)
Size of protective structure: Width 8 m × height 8 m, thickness 150 mm
Material of outer frame: Lightweight H-shaped steel (H150mm x 150mm x 3.2mm x 4.5mm)
Material of inner frame: Lightweight H-shaped steel (H150 mm x 75 mm x 3.2 mm x 4.5 mm)
Material of cover member: Iron plate (thickness 3.2 mm)
(Flying thing)
Rectangular body (virtual car): Length 4.6 m x width 1.6 m x depth 1.4 m (collision height: 0.6 m), weight 2 t

  The protective structure was fixed to the wall of the building by the support fitting, and the vehicle rigidity of the rectangular body (virtual car) was set so as to be crushed in the event of a collision and to absorb energy by itself.

The results are shown in FIG. 12 and FIG.
As shown in FIG. 12 and FIG. 13, when the flying object collided, the collision evaluation model was deformed so as to be recessed about the collision position, and it was confirmed that the maximum deformation amount was about 710 mm.
In addition, airborne objects (cars) did not reach the wall surface to be protected, and almost no deformation was seen.

  That is, it was confirmed that the protective structure of the present invention can absorb the impact impact of a large flying object such as a car while reducing the amount of deformation even if it is lightweight.

  The protective structure of the present invention is suitable for the installation of walls of buildings such as buildings, warehouses, fuel oil tanks, water supply tanks and the like.

Reference Signs List 1 protective structure 2 frame 3 inner frame 3A axial member 3B axial member 4 outer frame 5 cover member 6 cover member 7 reinforcing cover PO equipment

Claims (5)

A protective structure that protects the building, warehouse, power supply facilities, and other structures by absorbing the impact of high penetration objects when they collide.
A frame having a framework provided in a grid form;
And a high strength wire mesh cover member attached to the back surface of the frame so as to cover the opening in the frame.
The high strength wire mesh is
The periphery is connected to the periphery of the frame,
A protective structure characterized in that a reinforcing cover made of a metal plate is attached so as to cover an opening located at a peripheral portion of the frame. The frame is
The protective structure according to claim 1, wherein the protective structure is formed in a lattice shape by combining axial members having a rigidity higher than that of the cover member. The frame is formed by combining H-shaped steel,
The H-shaped steel is an H-shaped steel having a plate thickness of 3 to 15 mm,
The protective structure according to claim 1 or 2, wherein the cover member is a metal plate having a thickness of 2 to 6 mm. The framework of the frame is
The protective structure according to claim 1, 2 or 3 , wherein the width of the opening is 1 to 1.5 m and the height of the opening is 1 to 1.5 m. The protective structure according to any one of claims 1 to 4 , characterized in that it is formed into a wall shape and is installed at a certain distance from the outer surface of the structure to be protected and / or the structure. .