JP4892106B1 - Storage facility - Google Patents

Abstract

An object of the present invention is to provide a storage facility in which the direction of action of blast fragments and blast pressure can be regulated in a specific direction and the safety distance can be greatly shortened.
A storage facility for storing explosives comprising a warehouse main body and a covering soil covering the periphery of the warehouse main body with a predetermined earth covering, the storage facility being a part of the ceiling of the warehouse main body, A fragile portion was formed along the longitudinal direction of the main body, and the direction of action of the blast fragments and blast pressure was restricted to the direction directly above the warehouse main body via the fragile portion.
[Selection] Figure 1

Description

  The present invention relates to a storage facility for storing explosives and the like.

The storage distance for explosives and the like is regulated by law from the viewpoint of ensuring safety in the vicinity.
In addition, in order to ensure the safety of the storage facility itself, in general, the warehouse body is constructed firmly with thick wall concrete, and the warehouse body is covered with a large amount of earth and sand to minimize the impact of the explosion. Yes.
On the other hand, the entire outer periphery of the warehouse body is covered with a sheet body, and the weight of the soil cover is used to prevent the sheet body from rising, thereby suppressing the scattering of explosive fragments and the diffusion of blast pressure, thereby improving the safety of the warehouse body. Japanese Patent Application Laid-Open No. 2004-228561 describes a storage room.

JP 2010-195538 A (FIG. 2)

Conventional storage facilities have the following problems.
<1> In a conventional storage facility that does not have a sheet body, when explosives explode, there is a risk that the explosive pieces and blast pressure of the warehouse body may spread over a wide range.
Furthermore, if the side wall and ceiling of the warehouse body are made thicker and designed to have a high strength, the influence range of explosive fragments and blast pressure can be reduced to some extent, but there is a problem that the construction cost of the warehouse body increases.
<2> The storage described in Patent Document 1 is long because the sheet installed only on the upper part of the warehouse main body exhibits the effect of suppressing the explosion pieces and the blast, but the explosion pieces and the blast diffuse in an oblique direction of 45 degrees. A safety distance is required.
<3> Since a general storage facility has a structure in which the cross-sectional shape of the warehouse main body is rectangular and supports the loading load of the covering soil acting on the horizontal top plate of the warehouse main body on the side wall, A large bending moment acts on the upper and lower portions of the side wall.
Therefore, the warehouse body must be built with high strength in proportion to the soil covering weight.
Moreover, when the installation area of the warehouse main body is increased, it is necessary to take reinforcement measures such as providing a column member to prevent the top plate from being bent and deformed.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a storage facility that can regulate the direction of action of blast fragments and blast pressure to directly above, and can realize a significant reduction in the safety distance. There is to do.

A first invention of the present application is a storage facility for storing explosives comprising at least a warehouse main body and a cover covering the periphery of the warehouse main body with a predetermined earth covering, and a ceiling having a cross-sectional arch shape of the warehouse main body. It is a part, Comprising: The weak part was formed along the longitudinal direction of this warehouse main body, and the action direction of the explosion piece and the blast pressure was regulated to the directly above direction of the warehouse main body through the said weak part.
According to a second invention of the present application, in the first invention, the warehouse main body includes a rectangular bottom plate and a top shell plate having a fragile portion formed on a part of the ceiling and having a cross-sectional arch shape mounted on the bottom plate. The both sides of the upper shell plate are rigidly joined to the bottom plate.
According to a third invention of the present application, in the second invention, after the hem portions of the upper shell plate are accommodated in fitting grooves formed on both side ends of the bottom plate and pin-joined, the joint portions are rigidly connected so as not to be separated. Then, both sides of the upper shell plate are rigidly joined to the bottom plate.
According to a fourth invention of the present application, in any one of the first to third inventions, an explosion-proof sheet is further included, and the explosion-proof sheet is embedded in a cover soil above the warehouse body.
According to a fifth invention of the present application, in any one of the first to fourth inventions, the covering soil is constituted by a laminate of a plurality of explosion-proof bags.
According to a sixth aspect of the present invention, in any one of the first to fourth aspects, the warehouse body is made of precast concrete.
According to a seventh aspect of the present invention, in any one of the first to fourth aspects, the warehouse body is made of cast-in-place concrete.

<1> In the present invention, the direction of action of the explosion pieces and the blast can be regulated directly above the warehouse body through a weakened part formed in a part of the ceiling of the warehouse body.
Therefore, in the present invention, the security distance can be greatly reduced as compared with the prior art.
<2> Since the fragile part formed in the upper shell plate has a structure that breaks ahead of other parts, the destruction range of the upper shell plate is minimized as compared with the case where no fragile part is provided. The explosion-proof property of the storage facility is greatly improved.
<3> The joint between the bottom and bottom slabs of the rigidly bonded upper shell plate of the warehouse body becomes a plastic hinge in the event of an explosion, widening the opening at the top of the upper shell plate, and directly above the warehouse body Make it easier to converge the explosive pieces and the direction of the blast.
<4> The blast pressure can be relieved by exhibiting an internal pressure energy absorbing action when the joints of both the bottom plate and the bottom plate of the upper shell plate become plastic hinges.
<5> When an explosion-proof sheet is embedded in the cover soil above the warehouse body, the explosion-proof sheet suppresses explosive fragments and blast pressure, further improving the explosion-proof property of the storage facility.
<6> By configuring the cover soil with a laminated body of a plurality of explosion-proof bags, the resistance to explosion pieces and the blast pressure by the explosion-proof bag and the energy attenuation performance are remarkably improved as compared with the ordinary soil cover with only earth and sand.

The perspective view of the storage facility which abbreviate | omitted one part which concerns on Embodiment 1 of this invention An enlarged cross-sectional view of the top part of the upper shell plate illustrating the weak part An enlarged cross-sectional view of the top part of the upper shell plate illustrating the weak part Enlarged cross-sectional view of the joint between the bottom plate and the upper shell plate Illustration of how to build a storage facility Model diagram for explaining explosion-proof property of storage facility The expanded cross-sectional view of the upper part of the warehouse main body which concerns on Embodiment 2 of this invention Model diagram of above-ground and semi-underground storage facility according to Embodiment 3 of the present invention Model diagram of warehouse body according to embodiment 4 of the present invention Model diagram of another warehouse body according to Embodiment 4 of the present invention

[Embodiment 1]
Embodiments of the present invention will be described below with reference to the drawings.

<1> Outline of Storage Facility FIG. 1 is a perspective view of a storage facility with a portion omitted according to the present invention, FIGS. 2 and 3 are enlarged cross-sectional views of the top of the upper shell plate, and FIG. Fig. 5 shows an enlarged cross-sectional view of the joint between the bottom plate and the upper shell plate constituting Fig. 5, and Fig. 5 shows the construction process of the storage facility.

In Figure 1, storage facilities and the precast made warehouse body 20 exhibits a cross-section arcuate, and covered with soil 30 covered by overburden predetermined soil around the warehouse body 20, which is embedded in the upper cover soil warehouse body 20 explosion And a sheet 40.
In this example, the case where the storage facility is an underground storage facility in which a warehouse body 20 is installed on the bottom surface of a buried space 11 such as a groove or a depression cut in the ground 10 and the periphery of the warehouse body 20 is covered with a covering soil 30 is described. To do.
The wellhead of the warehouse main body 20 is sealed with, for example, a concrete wall, a bank wall, etc., and necessary materials such as a fireproof door for entrances and ventilation holes are provided in a part thereof.
The main components will be described in detail below.

<2> Warehouse Main Body The warehouse main body 20 is a warehouse constructed of reinforced concrete or the like, and includes at least a bottom plate 21 having a rectangular planar shape and an upper shell plate 25 having a cross-sectional arch shape that serves as a side wall and a ceiling.
The reason why the upper shell plate 25 is separated from the bottom plate 21 is to meet the demand for workability.

<2.1> Bottom Slab The bottom slab 21 is made of precast, cast-in-place concrete, or a composite slab of these. Forming fitting grooves 22 along the axial direction of the upper shell slab 25 at least on both sides of the bottom slab 21 is doing. The fitting groove 22 has a structure capable of accommodating both hem portions of the upper shell plate 25 and rigidly connecting them.

<2.2> Upper shell plate The upper shell plate 25 separate from the bottom plate 21 is formed of a curved arc plate made of precast or cast-in-place concrete.
When the upper shell plate 25 is formed by precast, the upper shell plate 25 is constituted by an arc-shaped divided plate divided into two from the center of the upper shell plate 25 so as to have a bilaterally symmetrical shape.

The upper shell plate 25 was formed on the cross-sectional arcuate, transmits the mounting load of the soil cover 30 as an axial compression force, a bending moment occurs in the upper shell plate 25, in order to greatly reduced compared with the case of a rectangular cross section It is.

<2.3> Fragile portion of upper shell plate The upper shell plate 25 has a weak portion 26 at a part of the ceiling, that is, the topmost portion of the upper shell plate 25.
The fragile portion 26 is a portion that is not damaged by the loading load of the covering soil 30 and breaks prior to other portions when the blast pressure is applied, and extends along the longitudinal direction of the warehouse body 20 at the top of the upper shell plate 25. Are formed continuously.
The weak part 26 is formed at the topmost position of the upper shell plate 25 by restricting the direction in which the blast fragments are scattered and the direction in which the blast pressure is diffused to the direction directly above the warehouse body 20, thereby shortening the security distance of the storage facility. It is to do.

  In the case where the upper shell plate 25 as shown in FIG. 2 is composed of precast divided plates 25a and 25a divided into two left and right from the center, the uppermost opposing surfaces 25b and 25b of the divided plates 25a and 25a are mutually connected. The fragile portion 26 may be constituted by a hinge formed by combining the concave portion 25c and the convex portion 25d formed so as to be fitted.

Further, as shown in FIG. 3, when the upper shell plate 25 is made of cast-in-place concrete, the brittle portion is formed by the induction joint in which the slit 25e is formed from the uppermost outer peripheral surface side to the inner peripheral surface side of the upper shell plate 25. 26 may be configured.
As another form of the fragile portion 26 when the upper shell plate 25 is cast in place, the thickness of the topmost portion of the upper shell plate 25 may be formed thinner than other portions. What is necessary is just to have a structure in which the fragile portion 26 is damaged prior to other parts by the blast pressure when an explosion occurs.

<2.4> Joining Structure of Bottom Plate and Upper Shell Plate In the present invention, the bottom plate 21 and the bottom plate of the upper shell plate 25 are joined together in a rigid joint form.
The reason why the rigid joint is employed is that when the explosion occurs, the joint portion between the skirt portion of the upper shell plate 25 and the bottom plate 21 is not separated before the fragile portion 26.
By rigidly joining the upper shell plate 25 and the bottom plate 21, the fragile portion 26 can be destroyed most quickly, and the entire upper shell plate 25 can be effectively prevented from scattering in all directions.

<3> Explosion-proof sheet The explosion-proof sheet 40 shown in FIG. 1 is a non-breathable and water-proof sheet-like member for absorbing the energy of the blast fragments and blast pressure using the load of the covering soil 30.
The material of the explosion-proof sheet 40 is preferably a material that is not affected by heat as much as possible, and is preferably a natural rubber or a synthetic rubber-based sheet material having higher heat resistance than a thermoplastic resin-based material. If satisfactory, there is no problem even if a thermoplastic resin sheet is used.
When a high temperature is expected, it is also effective to use a sheet material having a high heat resistance temperature such as saran resin.
When strength is required, a sheet material reinforced by embedding, covering, or sandwiching metal or fiber in a rubber material is desirable.

Since the storage facility according to the present invention can regulate the direction in which the blast fragments are scattered and the direction in which the blast pressure is diffused directly above the warehouse body 20, it is not necessary to cover the entire area of the warehouse body 20 with the explosion-proof sheet 40, and at least the upper shell. What is necessary is just to be separated from the plate | version | printing 25, and to be located substantially horizontal above the weak part 26, and the intensity | strength of the explosion-proof sheet | seat 40 should just be suitably selected according to magnitude | sizes, such as a blast pressure assumed.
The number of explosion-proof sheets 40 is not limited to a single number, and a plurality of sheets may be installed hierarchically at intervals.

  The explosion-proof sheet 40 is not essential and may be omitted.

[Construction method for storage facilities]
Next, the construction method of the storage facility will be described with reference to FIG.

<1> Installation of Bottom Plate FIG. 5A shows an assembling process of the warehouse main body 20. First, the bottom plate 21 is installed on the bottom surface of the buried space 11 which has been sufficiently compacted.
As shown in FIG. 5 (a), parts 21a and 21a on both sides of the bottom slab 21 are produced in advance by precasting, as shown in FIG. 5 (a). It is preferable to construct the bottom plate 21 in which the concrete 21b is integrally cast on the ground.

<2> Mounting the upper shell plate Next, a precast divided plate 25a obtained by dividing the upper shell plate 25 into two left and right parts from the center is mounted on the bottom plate 21 to assemble the upper shell plate 25 having an arched section.
A weakened portion 26 is formed at the top of the butted divided plate 25a.

Since the precast divided plate 25a can be constructed with two cranes, the construction is easy and the construction period can be shortened, and each divided plate 25a can be made independent by abutting the tops of the left and right divided plates 25a. Therefore, the upper shell plate 25 can be efficiently assembled without using a separate support member.
In this example, the case where the upper shell plate 25 is constituted by a plurality of precast divided plates 25a will be described. However, as described above, the upper shell plate 25 may be made of cast-in-place concrete, and the situation of the site and the size of the storage facility In consideration of the above, precast products or cast-in-place concrete products are used properly.

<3> Joining of bottom plate and upper shell plate The bottom plate 21 and the upper shell plate 25 are finally rigidly joined between the bottoms.
A rigid joint structure between the bottom portions of the bottom plate 21 and the upper shell plate 25 illustrated in FIG. 4 will be described.

<3.1> Pin Joining The bottom portion of the upper shell plate 25 is fitted into the fitting groove 22 of the bottom plate 21 and positioned.
When the skirt portion of the upper shell plate 25 is placed on the bottom plate 21, the joint portion becomes pin-bonded, and the upper shell plate 25 maintains a stable posture with respect to the bottom plate 21.

<3.2> Rigid Joining Next, the joint part that has been pin-joined is rigidly joined in a non-separable manner by the following simple operation, and both side portions of the upper shell plate 25 are rigidly joined to the bottom plate 21.
In other words, the rebar 25f extending downward from the bottom surface of the bottom portion of the upper shell plate 25 and the rebar 21c extending upward from the fitting groove 22 of the bottom plate 21 are connected by the sleeve-shaped rebar joint 27. Then, mortar is filled in the opening 25g for work opened at the bottom of the upper shell plate 25 and rigidly joined.
As the joint structure of the bottom plate 21 and the upper shell plate 25, a known rigid joint structure can be applied in addition to the mortar-filled reinforcing bar joint described above.

<3.3> Reason for Dividing the Bonding Two Times One of the reasons for the rigid joining after the pin joining between the skirts of the upper shell plate 25 and the bottom plate 21 is the weight of the precast divided plate 25a. This is for reducing the weight and improving the assembling workability of the upper shell plate 25.
In assembling the warehouse main body 20, when the skirts of the pair of left and right divided plates 25a are temporarily joined to the bottom plate 21 and positioned, the tops of the pair of left and right divided plates 25a are joined to each other using the weight of the divided plate 25a so as not to be separated from each other. Therefore, the workability of the temporary assembly of the upper shell plate 25 is improved.
Furthermore, since the temporary joining step of the upper shell plate 25 and the bottom plate 21 by pin joining and the rigid joining step of rigidly joining the temporary joining portion by mortar filling can be performed in parallel, the assembling workability of the warehouse body 20 is improved.

<4> Covering soil FIG. 5B shows a work process of covering the periphery of the warehouse main body 20 with the covering soil 30. The covering soil 30 is filled with earth and sand in the buried space 11.
In the middle of the work of the covering soil 30, an explosion-proof sheet 40 is embedded above the warehouse body 20.
As shown in FIG. 5C, the storage facility is completed in which the periphery of the warehouse body 20 is covered with the covering soil 30 until the predetermined covering is reached.

<5> Arch action of upper shell plate Since the fragile portion 26 of the upper shell plate 25 constituting the warehouse body 20 is formed to have a strength capable of withstanding the load of the cover soil 30, the load of the cover soil 30 on the upper shell plate 25 The upper shell plate 25 can maintain the original shape even if acts.
Further, since the upper shell plate 25 has a cross-sectional arch shape, an excessive force is not applied to the entire upper shell plate 25 by the arch action, and a stable posture can be maintained.
Therefore, the upper shell plate 25 can easily withstand the loading load of the covering soil 30 and the casing thickness of the upper shell plate 25 can be reduced as compared with a box having a rectangular cross section.

[Explosion proof of storage facilities]
Next, the explosion-proof property of the storage facility will be described with reference to FIG.

<1> Explosion-proof property of warehouse main body In the storage facility according to the present invention, the fragile portion 26 at the top of the upper shell 25 constituting the warehouse main body 20 is formed more fragile than the other parts of the upper shell 25, The skirt portion of the upper shell plate 25 is rigidly joined to the bottom plate 21.

When an explosion occurs in the warehouse body 20, the internal pressure of the upper shell plate 25 increases. This internal pressure acts as an explosion pressure P _{1 on the} entire inner circumference of the warehouse body 20.
If this explosion pressure P ₁ is within the strength of the upper shell plate 25, the load of the covering soil 30, and the strength of the joint between the bottom plate 21 and the upper shell plate 25, the warehouse body 20 is not destroyed. Can withstand this explosive pressure.

When the explosion pressure P ₁ reaches a predetermined value or more, the weakest portion 26 at the top of the upper shell plate 25 is broken, and the uppermost portion of the upper shell plate 25 opens to the left and right with the joint with the rigid bottom plate 21 as a fulcrum. The blast fragments and the blast P ₂ are ejected in the direction directly above the warehouse body 20.
When the topmost portion of the upper shell plate 25 opens to the left and right, the joint between the rigidly bonded bottom plate 21 and the upper shell plate 25 becomes a plastic hinge and absorbs energy.
Thus, the joint part converted from the rigid joint to the plastic hinge makes it difficult to separate the bottom part of the upper shell plate 25 from the bottom plate 21.

<2> Explosion-proof property of soil covering and explosion-proof sheet Explosive fragments and blast P ₂ directed directly from the top of the upper shell plate 25 to the top reach the explosion-proof sheet 40 while being attenuated in energy when passing through the cover soil 30. To do.
If the blast fragments and the blast P ₂ are equal to or lower than the breaking strength of the explosion-proof sheet 40, the strength of the explosion-proof sheet 40 can suppress the rise of the blast fragments and the blast P ₂ .
In addition, since the explosion-proof sheet 40 is embedded in such a manner that the upper and lower surfaces thereof are sandwiched between the covering soils 30, the explosion-proof sheet 40 even if an upward blast fragment and the blast P ₂ act on a part (center) of the explosion-proof sheet 40. The whole rise is prevented.

When the blast fragment and the blast P ₃ exceed the breaking strength of the explosion-proof sheet 40, the blast fragment and the blast P ₃ break through the explosion-proof sheet 40 and the covering soil 30 thereabove and jet out to the ground.
During this time, the energy of the blast fragments and the blast P ₃ is effectively attenuated by the energy absorbing action by the rigid joint structure between the bottom plate 21 and the upper shell plate 25, the passage resistance of the covering soil 30, and the explosion-proof action of the explosion-proof sheet 40. The

The conventional storage facility cannot control the direction of action of the blast fragments and blasts, and the explosion pieces and the blasts diffuse obliquely upward at 45 degrees, so it is necessary to increase the safety distance.
Further, if only the hem part of the upper shell plate 25 and the bottom plate 21 are pin-bonded, both hem parts of the upper shell plate 25 are separated from the bottom plate 21 when blast pressure is applied, and the upper shell plate 25 The opening at the top is reduced. Therefore, the upper shell plate 25 is totally destroyed, and blast fragments and blasts are scattered over a wide range.

On the other hand, in the present invention, the weakened portion 26 is provided at the top of the upper shell plate 25 and the bottom portion of the upper shell plate 25 is rigidly joined to the bottom plate 21 so that the action direction of the blast fragments and blasts can be changed. Since it is possible to control by focusing in the direction directly above, it is possible to remarkably reduce the influence range of blast fragments and blast pressure directed horizontally as compared with conventional storage facilities.
In other words, the size of the blast fragments and the blast pressure has a great influence on the height of the jet directed directly above the warehouse body 20, but has little influence on the lateral diffusion range.

Furthermore, in the present invention, not only can the direction of blown fragments and blasts be controlled in a specific direction, but also the topmost part of the upper shell plate 25 that serves both as a side wall and a ceiling has a structure that is easy to positively open. Compared with the case where the portion 26 is not provided, the range in which the upper shell plate 25 is broken can be minimized.
If the destruction range of the upper shell plate 25 can be reduced, the amount of explosion pieces generated can be reduced, so that the explosion-proof property of the storage facility is further improved.
Due to a plurality of factors described above, the storage facility according to the present invention can significantly reduce the security distance compared to the conventional one.

[Embodiment 2]
Other embodiments will be described below. In the description, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 7 shows another embodiment in which the covering soil 30 is constituted by a plurality of explosion-proof bags 33.
The explosion-proof bag 33 includes a flat bag body 31 formed of a non-stretchable material and a filling material 32 such as earth and sand filled in the bag body 31.
A plurality of explosion-proof bags 33 are stacked around the upper shell plate 25 to construct the covering soil 30.
The stacking range of the explosion-proof bag 33 is the whole or a part of the buried space 11 shown in FIG.
A plurality of explosion-proof bags 33 may be stacked and positioned above the topmost portion of the upper shell plate 25 where at least the fragile portion 26 is formed.

When an external force is applied to the explosion-proof bag 33, the bag body 31 restrains the internal filling material 32 to exert an interlocking action, and the explosion-proof bag 33 is rigidly connected.
Therefore, in this example using a plurality of explosion-proof bags 33 in place of the cover soil, the resistance to explosion pieces and blast pressure and the energy attenuation performance by the explosion-proof bag 33 are remarkably higher than the cover soil 30 only of ordinary earth and sand. There is an advantage of improvement.
In addition, the size and thickness of the explosion-proof bag 33 are appropriately selected in consideration of the scale of the storage facility and the assumed blast pressure.

[Embodiment 3]
The present invention is not limited to an underground storage facility, and the warehouse main body 20 shown in FIG. 8A is installed on the ground 10, and the warehouse main body 20 is surrounded by a dam-like covering soil 30. As shown in FIG. 8B, the warehouse main body 20 is installed on the bottom surface of the buried space 11, and the warehouse main body 20 is applied to a semi-underground storage facility covered with a bank-shaped covering soil 30. Is also possible.
The operational effects of the warehouse main body 20 and the explosion-proof sheet-like material 40 in this example are the same as those of the first embodiment described above, and thus the description thereof is omitted.

  Although illustration is omitted, when the covering soil 30 is constructed by embankment, if the embankment embedding reinforcing sheet such as geotextile or geogrid is embedded between each embankment layer and the covering soil 30 is constructed as a reinforcing embankment, the covering soil 30 In addition to improving the shape stability, the embankment reinforcing sheet located above the warehouse body 20 functions as an explosion-proof sheet.

[Embodiment 4]
9 and 10 show another warehouse body 20.
FIG. 9 shows a case in which the warehouse main body 20 is constructed by combining a cast cast concrete 25k and cast-in-place concrete in which the base portion 21a of the divided plate 25a and the bottom plate 21 are integrally formed in advance.
In this example, the upper shell plate 25 is constructed by assembling into a cross-section arch shape using the brace cast piece 25k, and then the warehouse main body 20 is constructed by simply placing the concrete 21b between the parts 21a and 21a on both ends. it can.
In this example, since the brace cast piece 25k in which the upper shell plate 25 and the bottom plate 21 are rigidly joined in advance is used, the construction period can be shortened compared to the first embodiment, and the rigid joint structure There is an advantage that the strength can be set high.

  FIG. 10 shows a warehouse main body 20 in which a formwork is assembled on the site and the bottom plate 21 and the upper shell plate 25 are constructed by cast-in-place concrete.

DESCRIPTION OF SYMBOLS 10 ... Ground 11 ... Buried space 20 ... Warehouse main body 21 ... Bottom plate 25 ... Upper shell plate 26 ... Fragile part 30 ... ... Soil cover 40 ... Explosion-proof sheet

Claims (7)

In a storage facility for storing explosives comprising at least a warehouse main body and a cover soil covering the periphery of the warehouse main body with a predetermined soil covering,
A part of the ceiling having a cross-sectional arch shape of the warehouse body, forming a fragile portion along the longitudinal direction of the warehouse body,
The action direction of the blast fragments and blast pressure is regulated to the direction directly above the warehouse body through the weak part,
Storage facility. 2. The both sides of the upper shell plate according to claim 1, wherein the warehouse main body includes a rectangular bottom plate, and a top shell plate having a fragile portion formed on a part of the ceiling and having a cross-sectional arch shape mounted on the bottom plate. A storage facility characterized by rigidly joining the bottom plate to the bottom plate.   3. The upper shell plate according to claim 2, wherein both hem portions of the upper shell plate are accommodated in fitting grooves formed on both side ends of the bottom plate and pin-joined, and then the joint portions are rigidly connected to each other so as not to be separated. A storage facility characterized by rigidly joining the bottom plate to the bottom plate.   The storage facility according to any one of claims 1 to 3, further comprising an explosion-proof sheet, wherein the explosion-proof sheet is embedded in a cover soil above the warehouse body.   The storage facility according to any one of claims 1 to 4, wherein the covering soil is constituted by a laminated body of a plurality of explosion-proof bags.   5. The storage facility according to claim 1, wherein the warehouse body is made of precast concrete.   5. The storage facility according to claim 1, wherein the warehouse main body is made of cast-in-place concrete.

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