JPH0618320Y2 - Radiation shield - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a radiation shield device, and particularly to a radiation shield device suitable for regularly inspecting equipment that radiates radiation or welded portions of pipes in a nuclear power plant or the like. Regarding the device.

[Prior Art] In the conventional nuclear power plant, as shown in FIG.
A radiation shield plate for reducing radiation exposure (hereinafter abbreviated as shield plate) with a steel plate having a plate thickness of 16 mm or more on the maintenance passage 22 side around the equipment or pipe 21 that emits radiation to reduce the exposure dose to 0 24 are provided. However, in the nuclear power plant, the equipment that emits radiation or the welded portion 25 of the pipe 21 is required to be regularly inspected. At that time, since the shielding plate 24 interferes with the inspection work, the shielding plate 24 was disassembled each time the inspection work was performed, and was restored after the inspection work was completed.

The shielding plate 24 has a structure in which the dividing portion 26 is bolted so that it can be disassembled. However, since the plate thickness is large as described above, the disassembled product has a considerable weight. For this reason, there is a drawback that the inspection worker does not improve the work efficiency by the manual work while wearing the radiation protection suit, and the radiation exposure time becomes long.

Radiation shielding plates for solving such problems are disclosed in Japanese Utility Model Publication No. Sho 55-164597 and Japanese Utility Model Publication No. 55-170700. In the radiation shielding plate disclosed in these documents, the shielding plate is divided into a plurality of rectangular plates, and the plurality of rectangular plates are connected in a bellows shape so that they can be folded during inspection work.

However, the radiation shielding plate disclosed in Japanese Utility Model Laid-Open No. 55-164597 has a defect that radiation is transmitted through the gap because there is a gap in the connecting portion of the rectangular plates.

Further, the radiation shield plate disclosed in Japanese Utility Model Laid-Open No. 55-170700 has a drawback that the number of components increases because the gap between the connecting portions of the rectangular plates is shielded by the lead-containing plate. Further, Japanese Utility Model Laid-Open No. 53-134753 discloses, as a device of a folding door, that a folded portion can be made into an inclined surface and abutted against each other to prevent see-through of a joint between panels.

However, all of these known examples open and close only in the horizontal direction, and do not consider opening and closing in the vertical direction. Therefore, the shield plate's own weight cannot be used, and it is necessary to apply a load to both the opening and closing operations.

[Problems to be solved by the invention]

The present invention has been made in view of such a situation, and the gap between the connecting portions of the rectangular plate can be shielded without using a shield member other than the rectangular plate and is used in the vertical direction. An object of the present invention is to provide a radiation shielding device that can be automatically stored in a storage unit.

[Means for solving problems]

According to the present invention, in a radiation shield device for reducing radiation exposure provided in the vicinity of a device or a pipe that emits radiation, the shield device is divided into a plurality of rectangular shield plates, and each shield plate is divided into a plurality of rectangular shield plates. Are connected by a hinge so that they can be folded, and the cross-sectional shape of the hinge connection portion is formed in a taper shape so that the ends of the adjacent shield plates overlap each other when they are deployed by the hinge. It is characterized in that when it is folded, it can be stored in the storage portion provided under the shielding plate by its own weight when used in the direction.

[Action]

When a plurality of shield plates are vertically expanded by a hinge, the tapered portions formed in the hinge connection portions of the adjacent shield plates overlap each other, thereby closing the gap between the shield plate connection portions. This makes it possible to shield the gap without using a shield member other than the shield plate and prevent radiation from passing through the gap. On the other hand, during the inspection work, contrary to the above, the shielding plate can be bent and folded so that it can be stored so that it can be folded and folded vertically downward so that it will be in the closed state. You can do it without

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the first embodiment to which the radiation shielding device according to the present invention is applied.
FIG. 2 is a perspective view showing an embodiment, FIG. 2 is a cross-sectional view of a shield plate connecting portion of a radiation shielding apparatus according to the present invention, and FIG. 3 is a perspective view of a storage box of the radiation shielding apparatus according to the present invention.

A plurality of shield plates 12 are rotatably connected to each other by a hinge 13 to form a continuous shield device 11. Shielding device 11
The drive device 14 for opening and closing the door is a manual winch 16 suspended on the beam 15 of the building, a belt 17 for transmitting the rotation of the manual winch 16, a drum 18 rotated by the belt 17, and a drum 18. Wire 19 and the uppermost shield plate 12 at the tip of the wire 19
It is composed of a hook 31 hooked on the hanging metal fitting 30 of a.

FIG. 1 shows a vertically laid pipe 2 that emits radiation.
1 shows a state in which 1 is shielded (closed state), and at the time of inspection, the inspection worker turns the manual winch 16 in a direction to loosen it, so that the shielding device 11 descends by its own weight and is supported by the support 32 from the building. It is stored so as to be folded in the stored storage box 33 and is in an open state. When the shielding plate 12a has been stored, the hook 31 hooked on the hanging metal fitting 30 is removed and the lid 34 of the storage box 33 is closed, so that the inspection work of the welded portion 25 and the like is not hindered by the shielding device 11. it can.

The reason why the shielding plate 12 can be stored so as to be folded in the storage box 33 is that the hinge 13 is attached to the front side E on one long side of the shielding plate and the back side N on the other long side of the shielding plate as shown in FIG. Thus, when the shielding device 11 descends due to its own weight, the shielding plate 12b folds on the front side E of the shielding plate 12c as indicated by the arrow a, and then the shielding plate 12b and the shielding plate 12c lie on the back side N of the shielding plate 12d. Folds like an arrow. The other shielding plate 12 not shown in FIG. 2 is continuously repeated the above operation, so that it can be made compact in the storage box 33 by its own weight as shown in FIG. 3 without using a storage mechanism. Can be stored.

In FIG. 2, the cross section of the connecting portion between the shield plate 12b and the shield plate 12c (hereinafter, the same applies to the shield plate 12c and the shield plate 12d, and the same between other shield plates 12 not shown) is tapered P. The tapered portions are formed so as to overlap each other when the shield plates 12b and 12c are deployed.

This makes it possible to shield the gap without using a shield member other than the shield plate 12 and prevent radiation from passing through the gap.

FIG. 4 is a second view to which the radiation shielding device according to the present invention is applied.
5 is a perspective view showing an embodiment, and FIG. 5 is a sectional view taken along line AA of FIG.

The configuration of this embodiment is almost the same as that of the first embodiment described above. The different portion has a structure in which the shield plate 12 is moved in the vertical direction in the first embodiment, but this embodiment has a structure in which it moves in a curved shape. However, there is no change in folding using the dead weight of the shielding plate. In this structure, the guide rail 35, the fixed roller 36 inside the guide rail 35, and the movable roller 37 on the guide rail 35 side of each shield plate 12 are provided in accordance with the curved movement locus.
1 can move smoothly along the guide rail 35.

Fig. 4 shows the piping 3 that radiates radiation and is laid horizontally.
8 shows a state in which 8 is shielded (closed state), and at the time of inspection, an inspection worker turns the manual winch 16 in a direction to loosen it so that the shielding device 11 is guided by the guide rail 3 by its own weight.
5, it descends along 5 and is stored in a storage box 33 supported by a support 32 from the building so as to be folded and opened. When the shielding plate 12a is stored, the hanging bracket 30
By removing the hook 31 hooked on the lid 31 and closing the lid 34 of the storage box 33, the inspection work of the welded portion 39 and the like can be carried out without hindering the shielding device 11.

The reason why the shield plate 12 can be stored compactly and the reason why the cross-section of the connecting portion between the shield plates 12 is the tapered shape P are the same as in the first embodiment described above.

As described above, the co-shielding device 1 according to the first and second embodiments
1 can be easily shielded and opened by operating the manual winch 16, and particularly when opened, it can be operated very easily by the weight of the shield plate.

Further, in the open state, the shield plate 12 constituting the shield device 11 can be stored compactly without using a storage mechanism due to its own weight, and an inspection passage and an inspection work space can be secured.

Further, even if the shield plate 12 has a folded structure and has a gap, the cross section of the connecting portion between the shield plates 12 has a tapered shape P, so that it is difficult for radiation to pass therethrough.

A modified example of this embodiment will be described below.

(I) According to the present embodiment, the object to be shielded is a pipe, but it can be applied to the shielding of various objects other than the pipe that can be expected to emit radiation.

(Ii) In this embodiment, the manual winch 16 and the belt 17 are used for the drive device 14, but this may be another system, for example, a sprocket and a chain or a gear and a pinion.

(Iii) According to the present embodiment, the cross section of the connecting portion between the shield plates 12 has a taper shape P, and the cross-sectional shape of each shield plate 12 has a parallelogram. However, as shown in FIG. 7, it has a trapezoidal shape. As a result, the folded state does not become diagonal stacking as shown in FIG. 8 but becomes almost stacking as shown in FIG.

[Effect of device]

According to this embodiment, when the plurality of shield plates are expanded by the hinge, the cross-sectional shape of the hinge connection portion is formed to be tapered so that the end portions of the shield plates vertically adjacent to each other overlap each other. The gap can be shielded without using a shield member other than the shield plate to prevent radiation from passing through the gap. Further, since the present invention is used in the vertical direction, it can be lowered by its own weight when folded and can be easily stored in a storage box.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention, FIG. 2 is a sectional view of a strip plate connecting portion according to the present invention, FIG. 3 is a perspective view of a storage box according to the present invention, and FIG. Is a perspective view showing a second embodiment of the present invention, FIG. 5 is a sectional view taken along line AA of FIG. 4, FIG. 6 is a perspective view showing a conventional example, and FIG. 7 is a modification of the present invention. A sectional view, FIG. 8 is a sectional view taken along line BB of FIG. 3, and FIG. 9 is a sectional view showing a modified example. 11 ... Shielding device, 12 ... Shielding plate, 13 ... Hinge, 14 ... Driving device, 16 ... Manual winch, 21 ... Piping, 33 ... Storage box.

Claims (1)

[Scope of utility model registration request] 1. A radiation shield device for reducing radiation exposure provided in the vicinity of a device or a pipe that emits radiation, wherein the shield device is divided into a plurality of pieces and has a rectangular cross section with a tapered end cross-section. Plates and hinges that are alternately attached to the front and back surfaces of each shield plate, a drive device that can vertically move the series of shield plates, and a storage box for storing the shield plates provided under the series of shield plates. A radiation shielding device comprising: