JPH10132996A - Shield door - Google Patents

Abstract

(57) [Summary] [Problem] To provide a shielding door which requires no trouble in manufacturing and has no problem in radiation shielding performance. SOLUTION: In a shielding door 3 which can be opened and closed via a hinge 4 in an opening part 2 made of concrete, the door is formed by a single thick steel plate, and the door is formed on the open side surface of the door. While a plurality of inclined surfaces 5 and 6 having different angles were formed, the side surfaces of the opening 2 corresponding to the inclined surfaces were formed on inclined surfaces 2b and 2c parallel to the inclined surfaces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielding door provided at an entrance of a building or the like in a facility such as a nuclear facility which needs to shield radiation.

[0002]

2. Description of the Related Art In a nuclear facility or the like, as shown in FIG. 3, when an opening E serving as an entrance and exit is formed in a wall W of a concrete building body, the thickness is set to shield radiation. A door D made of a fine iron plate having a size of at least 200 mm or more is provided as a shielding door.

[0003] However, if the thickness of the door D itself is large as described above, the side of the opening E and the side of the door D interfere at the time of opening / closing and cannot be opened / closed, so that the door D and the hinge H are not provided. The side surface of the (opening side of the door D) is formed as an inclined surface A cut obliquely in a straight line when viewed from a plane.
The side surface of the opening E facing the side surface is also formed as a slope B parallel to the slope A. The slope B is a slope where the opening of the opening E becomes narrower from the outdoor side to the outdoor side. An opening E located on the indoor side of the door D forms a step in the opening E so as to be a door stop surface S.

[0004] However, the door D having the above structure can shield the radiation indicated by reference numerals a and c in FIG. 3, but is formed on the inclined surface A and the opening E on the inclined surface B parallel to the surface A. The radiation indicated by the symbol a passing through the gap g clears the opening E.
Since the wall W penetrates obliquely, the effective thickness of the wall W becomes small and radiation may leak.

In view of this point, a door having a structure as shown in FIG. 2 has been proposed. The door D2 of FIG. 2 has a structure in which two iron plates d1 and d2 each having a thickness of about half of that of the door D of FIG. 1 are stacked, and the side of the door D2 on the open side (the left side in FIG. 2) is formed. In addition to forming the inclined surfaces A2 and A3 with different inclination angles,
A step ST is interposed between the inner iron plate d2 and the outer iron plate d1 on the inclined surfaces A2, A3 to form a door having inclined surfaces A2, A3 having different angles. When the door D2 is formed in this way, the gaps g2, g3 between the inclined surfaces A2, A3 on the opening side of the door D2 and the inclined surfaces B2, B3 of the opening E facing the surfaces A2, A3 are Since it is not straight but bent, the radiations indicated by reference numerals a and b in FIG. 2 do not leak from the gaps g2 and g3. Of course,
The door D2 in FIG. 2 can also shield the radiation indicated by reference numerals c and d. Although not shown in the drawings, doors requiring stronger shielding properties may include three or more polished iron plates laminated and fixed.

However, while the door D2 shown in FIG. 2 has no radiation leakage, the two iron plates d1 and d2 are adhered and laminated in close contact with each other.
This causes a problem that the cost is increased. By the way,
In the method of laminating and fixing the two iron plates d1 and d2, a joining pin is driven through the two iron plates d1 and d2. Since it is performed by a method of packing lead material,
It takes a lot of work. This point is even more remarkable in a door of a type in which three or more slabs are laminated and fixed.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the conventional shielding doors, and has as its object to provide a shielding door which requires no trouble in manufacturing and has no problem in radiation shielding performance. It is an issue.

[0008]

SUMMARY OF THE INVENTION An object of the present invention, which has been made to solve the above-mentioned problems, is to provide a shielding door which can be opened and closed via a hinge at an opening made of concrete. While forming the door with a piece of swarf iron plate, while forming a plurality of inclined surfaces having different angles on the side surface on the opening side of the door, the side surface of the opening corresponding to the inclined surface to a slope parallel to the inclined surface. It is characterized by having been formed.

In the configuration of the present invention, the side surface of the door to which the hinge is attached may also be formed of a plurality of inclined surfaces having different angles. Further, the plurality of inclined surfaces may be formed in a single convex arc shape, and may be substituted.

[0010]

Next, an embodiment of the shielding door of the present invention will be described. FIG. 1 is a plan sectional view of an example of the shielding door of the present invention.

In FIG. 1, reference numeral 1 denotes a wall made of concrete, which is usually formed to a thickness of about 700 mm to 2000 mm or more. 2 are formed. The width of the opening 2 is about 1000mm
The degree or more, but the width is arbitrary.
Further, a stepped door stop surface 2a is formed on the indoor side of the opening 2 at a position corresponding to the thickness of the door to be attached.

Reference numeral 3 denotes a shielding door which is openably and closably attached to the opening 2 via a hinge 4. It is formed by an iron plate. In the door 3, the left side surface in the figure has two inclined surfaces 5 having different angles.
6 is formed. The inclined surfaces 5 and 6 are located on the front side of the door 3 (or the back surface parallel thereto).
Is inclined at a shallow angle, and the inclined surface 6 on the back side following the surface 5 is inclined at an angle larger than the surface 5. The two inclined surfaces 5 and 6 may be formed in one convex arc-shaped surface (not shown).

As a result, in the opening 2, the side surface of the door 3 facing the inclined surfaces 5, 6 is formed as inclined surfaces 2b, 2c parallel to the inclined surfaces 5, 6, respectively. When the inclined surfaces 5 and 6 are one convex arc surface, the inclined surfaces 2b and 2c of the opening 2 are concave arc surfaces.

[0014]

The present invention has been described above. The door is formed of a single iron plate as described above, and the open side surface is formed with a surface having a different inclination angle. It is possible to omit the troublesome work of laminating and fixing iron plates, which is the most troublesome, as compared to a shield door in which the open side of each iron plate is formed on a different inclined surface after laminating one or more dirt iron plates on each other. it can. In addition, since only one iron plate is required to form the door of the present invention, the processing cost can be reduced, and there is an advantage that the cost of purchasing the material can be reduced. It is a matter of course that the radiation of the directions indicated by reference numerals a to d in FIG.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of an example of a conventional shielding door.

FIG. 2 is a cross-sectional plan view of another example of the conventional shielding door.

FIG. 3 is a plan sectional view of an example of the shielding door of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete wall 2 Opening 2b Inclined surface parallel to the inclined surface on the front side of the door 2c Inclined surface parallel to the inclined surface on the back side of the door 3 Shielding door 4 Hinge 5 Front side on the opening side of the door 3 6 Slope on the back side of the open side of the door 3

Claims (2)

[Claims] 1. A shielding door which is openably and closably provided at an opening made of a concrete via a hinge, wherein the door is formed by a single thick iron plate, and an angle is formed on an open side surface of the door. A shielding door, wherein a plurality of different inclined surfaces are formed, and a side surface of an opening corresponding to the inclined surface is formed on an inclined surface parallel to the inclined surface. 2. The side of the door to which the hinge is attached,
The shielding door according to claim 1, wherein the shielding door is formed on a plurality of inclined surfaces having different angles.