JPH0145307Y2 - - Google Patents

Description

[Detailed explanation of the invention] "Industrial application field" This invention relates to the wall structure of radioactive shelters.
Specifically, it relates to an improved device that has improved radiation shielding ability and electromagnetic wave shielding ability, and can also be made thinner and lighter in weight.

"Conventional Example" The wall structure of a conventional radiation shelter is made of mortar or concrete, or one in which reinforcing reinforcing bars are embedded in these materials.

``Problem that the invention aims to solve'' However, in such conventional examples, the radiation shielding ability and electromagnetic wave shielding ability of mortar and concrete are relatively low, so the thickness of the wall must be increased. Therefore, there are problems such as an increase in the weight of the radiation shielder.

The purpose of this invention is to solve this problem and provide a wall structure for a radiation shelter that is thin but has high radiation shielding ability.

"Means for Solving the Problem" In order to achieve the above-mentioned purpose, this invention consists of a thin lead plate and a thin mortar layer mixed with graphite, and these are combined with a rigid core for reinforcement. A technical measure is taken to laminate the parts together.

With this configuration, the graphite mixed in the mortar layer and the lead plate can double block radiation from the outside. Moreover, since the radiation shielding ability of graphite and lead is much higher than that of mere mortar or concrete, the thickness of these materials can be made extremely thinner than the wall thickness of conventional examples, and therefore the thickness of the entire wall can be made thinner. , its weight can also be reduced.

"Example" This invention will be described in detail below with reference to the drawings.

1 and 2 show an embodiment of this invention, and FIG. 1 is a longitudinal sectional side view of a radioactive shelter. The main body 2 of this radioactivity shelterer 1 is placed on a solid foundation 3 having a larger planar area. The main body 2 and the solid foundation 3 are connected via an anchor bolt (not shown) or the like. The solid foundation 3 is placed along the outside of the front and rear and left and right protective walls 11 of the main body 2.
Water collection blocks 4 are stacked in three layers on the upper surface of the container, also for the purpose of preventing floating.

As shown in FIG. 2, each wall 5 of the main body 2...
has a core member 6 made of iron plate, on the indoor side thereof, a lead plate 7 and a heat insulating material 8 made by laminating aluminum alloy foil 82 on one side of a glass wool sheet 81, for example, are laminated, and on the outdoor side. A heat insulating layer 9 made of, for example, styrofoam, and a mortar layer 10 containing graphite are laminated thereon. Code 11 is main body 2
A protective concrete wall covering the

In this way, by laminating the lead plate 7 and the mortar layer 10 mixed with graphite inside and outside, radiation from the outside can be doubly blocked and cut off by the graphite mixed in the mortar layer 10 and the lead plate 7. In addition, the lead plate 7 and mortar layer 10 have a much higher radiation shielding ability than a mortar layer or concrete layer that does not contain graphite (lead plate blocks alpha, beta, and gamma rays, and graphite blocks neutrons). , each can be formed thin, and the wall 5 as a whole can also be formed thin. Wall 5 due to this thinning
The decrease in the stiffness of the core member 6 is compensated for by the stiffness of the core member 6.

In this example, a heat insulating material 8 and a heat insulating layer 9 are provided inside and outside the core member 6, so that the outside air cools down to, for example, several tens of degrees below zero due to a thick radioactive cloud covering the ground. The impact of this can be extremely minimized.

Further, the end edge portion of the core member 6 is bent toward the outdoor side to form a flange 61 for joining. Edge portion 71 of the lead plate 7 superimposed on the indoor side surface of the core member 6
is bent along the flange 61. The walls 5 to be joined together are made by abutting the outer end surfaces of the edge portions 71 of the bent lead plates 7 against each other, and using bolts 12 and nuts 13 to jointly connect them with the flanges 61 of the core member 6 sandwiching them. Seamed by tightening. In this way, the lead plate 7, which has a better radiation shielding ability than the iron plate core member 6, is placed at the joint of the wall 5, and its dimension in the wall thickness direction is much larger than the thickness of the core member 6. Since the height is approximately the same as that of the large flange 61,
The radiation shielding capacity of the seam can be much higher than that of other parts of each wall 5. Further, the lead plate 7 is firmly attached to the core member 6 by tightening its edge portion 71 together with the flange 61 of the core member 6, so that it becomes difficult to separate from the core member 6.

"Effect" As explained above, according to this invention, radiation irradiated from the outside is blocked by the lead plate and graphite, which have far superior radiation shielding ability than mortar or concrete. In addition, lead plates and graphite have much better radiation shielding ability than mortar or concrete, so the thickness of each can be made much thinner than conventional walls in order to provide the desired radiation shielding ability for the entire wall. The overall thickness of the wall can be made thinner than before, and its weight can also be reduced as a result. Furthermore, since the decrease in rigidity due to the thinning of the entire wall is compensated for by the core member having the above-mentioned rigidity, the radiation shielding function and electromagnetic wave shielding function can be performed while the wall has sufficient rigidity even though the thickness of the entire wall is thin. It is possible to demonstrate this. Furthermore, since external electromagnetic waves are absorbed by the lead plate, the electromagnetic wave shielding ability of the wall is also greatly improved compared to conventional ones.

Of course, the present invention is not limited to the above-mentioned embodiment; for example, the heat insulating material 8 and the heat insulating layer 9 can be made of one of various known heat insulating materials or a combination thereof. In addition, the flange 61 and the edge portion 71 of the lead plate 7 are joined together.
The method of fastening them together can be modified in various ways, such as using rivets.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of this invention, with Figure 1 being a longitudinal sectional side view of a radioactive shelter, Figure 2 being a longitudinal side view of a radioactive shelter;
The figure is an enlarged view of the part indicated by the arrow in FIG. 1. 7...Lead plate, 10...Mortar layer.

Claims (1)

[Scope of utility model registration request] A wall structure for a radioactive shelter, characterized in that a lead plate and a mortar layer mixed with graphite are each formed into thin walls, and these are laminated together with a core member having rigidity for reinforcement.