JP5327645B2 - Wall structure in hydrogen related facilities - Google Patents

Description

  The present invention relates to various facilities that handle hydrogen (hereinafter referred to as hydrogen-related facilities), such as facilities that manufacture, transport, and store hydrogen, and in particular, is a facility for supplying hydrogen as a fuel to fuel cell vehicles as needed. The present invention relates to a wall structure suitable for application to a so-called hydrogen station.

  Development of a vehicle (fuel cell vehicle) that runs on a fuel cell that uses hydrogen as fuel is underway, but a system for supplying hydrogen as fuel to the fuel cell vehicle at any time is required in order to popularize the vehicle. It is indispensable, and it is assumed that many hydrogen stations (equivalent to conventional gas stations) will be installed in various places in the near future.

  Such a hydrogen station is a facility that stores a large amount of hydrogen, and is also installed in an urban area or a downtown area. Safety measures that assume a detonation or detonation are indispensable. Therefore, for example, Patent Document 1 proposes a hydrogen storage building in which the roof surface is peeled off integrally by a blast in the event of an explosion, thereby minimizing the explosion damage and the influence on the surroundings.

  In addition, although it is assumed that an aircraft will explode, Patent Document 2 proposes a composite material that can effectively absorb blasts and debris generated by the explosion, and this type of composite material is used in a hydrogen station. It is thought that explosion damage can be reduced by installing it in a gas cylinder room or a gunpowder storage.

JP 2008-57185 A Japanese Patent No. 2888634

  However, since the energy in the event of an explosion of hydrogen is extremely large, the conventional general method as shown in Patent Document 1 is not sufficient. In particular, it is more thorough in order to sufficiently suppress the damage caused by the blast pressure. Safety measures are considered necessary.

However, since this type of hydrogen station is often installed on a small site as a small-scale one, it is necessary to ensure sufficient safety space for safety measures, installation space for various safety facilities, and maintenance space. It is assumed that it will not be obtained.
In addition, this kind of facility is also premised on being economically operable, and therefore is required to be as close to maintenance-free as possible. It is not realistic to adopt an advanced and complicated safety management system that requires frequent maintenance (equipment cost and operation cost).

  In that respect, since the composite material shown in Patent Document 2 has a very special and complicated structure for aircraft, it is necessary to make the facility as simple and economical as possible. It is not realistic to apply it to a hydrogen station as it is, and the effectiveness and reliability when a hydrogen explosion is assumed are not necessarily sufficient.

  The above is a problem common not only to hydrogen stations but also to all facilities that handle hydrogen. Therefore, in order to promote the spread of fuel cell vehicles, it is necessary to establish the safety of hydrogen-related facilities such as hydrogen stations. In particular, there is a need for the development of effective and appropriate means for improving safety, which is as simple and inexpensive as possible and maintenance-free.

  In view of the above circumstances, the present invention is a wall surface structure suitable for application to hydrogen-related facilities such as a hydrogen station, and the wall of a chamber for handling hydrogen is used as a concrete wall using a deck plate as a driving form. An uneven surface is formed on the inner surface, and a deck plate that functions as a buffer against blast pressure during an indoor hydrogen explosion is mounted on the surface side of the concrete wall with both uneven surfaces shifted, It is characterized by securing a buffer space between them.

According to the wall surface structure of the present invention, in the unlikely event of a hydrogen explosion, the blast pressure acts on the deck plate as a buffer material, and the convex portion of the deck plate is pushed into the buffer space to cause plastic deformation. As a result, the blast pressure is effectively absorbed, and in particular, the reflected wall wave can be effectively absorbed to obtain an excellent buffering effect.
In addition, the wall surface structure of the present invention only requires the use of a deck plate, which is a general-purpose product, as a placing mold and a cushioning material. Therefore, it is possible to rationally realize hydrogen-related facilities such as a hydrogen station that is excellent in safety.

It is a figure which shows embodiment of the wall surface structure of this invention. It is a figure which shows the condition which received the blast pressure same as the above.

  FIG. 1 shows an outline of a wall surface structure according to an embodiment of the present invention. This is an example of application to a hydrogen station, which is a facility for supplying hydrogen as fuel to a fuel cell vehicle as needed, and inside various rooms (usually sealed or semi-sealed) that handle hydrogen. In order to reduce damage caused by hydrogen explosion, especially damage caused by blast pressure, it was applied to the wall surface.

  The wall surface structure of the present embodiment is mainly composed of a strong concrete wall 1 that can withstand a hydrogen explosion, and a deck plate 2 as a cushioning material against a blast pressure at the time of a hydrogen explosion is mounted on the interior surface of the wall. A buffer space 3 for allowing deformation of the deck plate 2 is secured.

The concrete wall 1 in the present embodiment is formed by using the deck plate 1a as a placement mold on the indoor side. Therefore, the surface of the concrete wall 1 on the indoor side has the unevenness due to the deck plate 1a as it is. Is formed.
As the deck plate 1a, a general-purpose product that has been widely used as a steel floor formwork for concrete slab construction can be used as it is, and the thickness and shape / dimensions (concave pitch and height) of each part are appropriately designed. For example, a plate thickness of 2.3 mm, a concave bottom width of 142 mm, a convex top width of 88 mm, and a concave depth (convex height) of 75 mm can be suitably used. It is.
The specification of the concrete wall 1 as a whole may be the same as that of a normal reinforced concrete wall, but the wall thickness and strength may be appropriately designed in consideration of the use of this room and the safety against the expected explosion scale. .

  In the present embodiment, the deck plate 2 is also used as a cushioning material attached to the indoor side of the concrete wall 1. The deck plate 2 can be a general-purpose product as it is the same as the deck plate 1a in the concrete wall 1, and the plate thickness, shape and dimensions may be appropriate, and the same thing as the deck plate 1a in the concrete wall 1 should be used. However, it is slightly smaller than that shown in the example, for example, plate thickness 1.0 mm, concave bottom width 110 mm, convex top width 94.7 mm, concave depth (convex height) 50 mm Can be suitably employed.

The deck plate 2 as a cushioning material is mounted on the surface side of the concrete wall 1 in a state where the uneven shape is different from the uneven shape formed on the surface of the concrete wall 1. In the meantime, the buffer space 3 is secured in a form in which the internal spaces of both concave portions are continuous.
The deck plate 2 may be attached to the concrete wall 1 by an appropriate method. For example, as shown in the illustrated example, the anchor bolt 4 is driven when the concrete wall 1 is constructed, or after the concrete wall 1 is constructed. An anchor bolt 4 may be retrofitted to the deck plate 1a used as a frame by welding or the like, and the deck plate 2 may be attached to the concrete wall 1 by the anchor bolt 4.
In that case, as shown in FIG.1 (b), the loose hole 6 is previously formed in the deck plate 2, and it fastens to the loose hole 6 with the nut 5 through the washer 7 through the anchor bolt 4, The deck plate 2 may be mounted in a state in which it can be displaced in the in-plane direction with respect to the concrete wall 1 within the range of the loose hole 6, so that deformation when the deck plate 2 is subjected to blast pressure is not constrained. A sufficient buffer effect can be obtained by reliably plastically deforming.

In that case, the deck plate 2 may be mounted in a state in which the convex portion of the deck plate 2 (the convex portion toward the concrete wall 1) is in contact with the convex portion of the concrete wall 1, but there is a slight gap between them. It is also possible to secure and mount the deck plate 2 in a state where it is floated from the concrete wall 1.
Further, the deck plate 2 is not only mounted so as to be displaceable in the in-plane direction with respect to the concrete wall 1 within the range of the above-mentioned loose hole 6, but is also displaced in the out-of-plane direction so as to be separated from the concrete wall 1. It may be installed in a possible state.

According to the above wall surface structure, in the unlikely event that a hydrogen explosion occurs in the room, the blast pressure acts on the deck plate 2 and, as shown in FIG. The blast pressure is effectively reduced by the plastic deformation of the deck plate 2 toward the buffer space 3 side, since the inner convex portion is deformed so as to be pushed into the concave portion formed on the surface of the concrete wall 1. It is absorbed and an excellent buffering effect is obtained.
In particular, when a hydrogen explosion occurs in a relatively narrow sealed chamber or semi-sealed chamber such as chambers in a hydrogen station, it is assumed that the blast pressure repeatedly reflects between the wall surfaces. According to the above, it is possible to effectively absorb the reflected wave on such a wall surface, and it can be expected to sufficiently reduce the damage caused thereby.

  In addition, simply mounting the deck plate 2 on the concrete wall 1 does not make the buffer space 3 formed between them a natural sealed space, so that even if the deck plate 2 is deformed by blast pressure, the buffer space 3 is buffered. The internal pressure of the space 3 does not increase excessively, and therefore, it is considered that the deformation of the deck plate 2 and the buffering effect thereby are not impaired, but if necessary, as shown in FIG. 3 is opened indoors at the edge (upper, lower, or side) of the wall surface, or an opening for releasing the internal pressure at a critical point (a position where no safety problem occurs) of the deck plate 2 is provided. It only has to be formed.

  As described above, the wall surface structure of the present invention not only provides an excellent buffering effect against the blast pressure, but it is only necessary to use the deck plates 1a and 2 which are general-purpose products as the driving form and the buffering material in the construction. In addition, since the buffer space 3 can be secured by simply mounting the deck plate 2 in a state slightly shifted from the deck plate 1a, the wall structure of the present invention is sufficiently simple and inexpensive to construct. It is possible, and daily maintenance is not necessary. From the above, a hydrogen-related facility such as a hydrogen station excellent in safety can be rationally realized.

In the above embodiment, both the deck plates 1a and 2 are installed in the direction along the vertical direction, but may be installed in the direction along the horizontal direction.
The wall surface structure of the present invention is preferably applied to the entire wall surface facing the room, but it is more preferable that the ceiling surface and, if possible, the floor surface have the same structure.

1 Concrete 1a Deck plate (placed formwork)
2 Deck plate (buffer material)
3 Buffer space 4 Anchor bolt 5 Nut 6 Loose hole 7 Washer

Claims (1)

  The wall of the room that handles hydrogen is a concrete wall that uses a deck plate as a placement mold, and the interior surface is uneven. The deck plate that functions as a buffer against blast pressure during a hydrogen explosion in the room is the concrete. A wall structure in a hydrogen-related facility that is mounted on the surface side of the wall with both irregularities shifted and a buffer space is secured between both deck plates.

Images