JP2589591Y2 - Lead mat for shielding pipes - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead mat for shielding pipes for shielding a pipe through which a liquid containing radioactivity flows in a nuclear facility or the like.

[0002]

2. Description of the Related Art In a nuclear facility or the like, a pipe through which a liquid or the like containing radioactivity flows is a main radiation source. Therefore, when inspecting or remodeling pipes or performing work in the vicinity, etc., in order to ensure the safety of workers and reduce the exposure dose to a specified value or less, the piping used as the radiation source must be simplified. It is necessary to provide a proper shielding.

As a shielding method, there is a method of directly winding a lead plate around piping. However, since the lead plate becomes extremely difficult to bend when it has a thickness of 3 mm or more, it is necessary to carry out operations such as transporting to a site after forming into a predetermined shape in advance to implement this means. There are various problems, such as that the work of attaching to pipes having different diameters is not easy.

[0004] There is also a mat formed of lead wool. This mat is flexible and easy to transport, and can be applied to pipes of various diameters. However, when shielding against high-energy γ-rays, the thickness of the lead bristle mat corresponding to the lead equivalent having an effective shielding ability is 3 times larger than that of a lead plate.
More than twice, requiring more shielding space.

[0005] In addition, in the case of lead plates and lead hairs, since no proper consideration is given to the fittings to be attached to the pipe, it is necessary to perform a troublesome operation such as tightening the pipe with a wire. I do.

On the other hand, for example, JP-A-60-18894, JP-A-61-204593, and JP-A-62-1
As disclosed in Japanese Patent No. 76500 or the like, as a method for reducing the labor required for mounting a heavy shielding material, lead particles are fed into a container or a bag installed in advance around a pipe to be worked on in advance. There is a means to shield

[0007] However, these means require a large-scale construction, such as a large-scale device for feeding lead particles into a container or the like, or a large amount of laying of piping or other associated work.
It becomes work.

[0008]

[Problems to be solved by the invention] In order to solve these problems, in order to easily shield a pipe which is a radiation source, the pipe is rich in flexibility and has an excellent shielding effect, and is attached to the pipe. It is desired to develop a shielding material that is easy to use.

[0009]

According to the present invention, a shielding mat with a belt, which is formed by stacking multiple lead thin plates and accommodated in a bag, is wound around a pipe serving as a radiation source, and a fastening comprising a belt and a fastener is provided. By being attached to the pipe by a mechanism, it is attached to the pipe irrespective of the outer diameter, and effective shielding can be performed.

[0010] In other words, the present invention is, its own weight or a slight
Flexible enough to be deformed by applying load
Lead thin plates are stacked in multiple layers and stored in a bag, and stacked
A gap is provided between the end of the lead sheet and the bag,
A mounting mechanism comprising a belt and a fastening tool is provided on the bag body.
It is characterized by becoming.

[0011]

The gist of the present invention will be described below in detail with reference to the drawings.

1 is an explanatory view of the lead mat for shielding pipes of the present invention, FIG. 2 is an enlarged cross-sectional view of a main part, FIG. 3 is a cross-sectional view taken along line II of FIG. 1, and FIG. FIG. 5 is an enlarged cross-sectional view of a main part showing a state where the mat according to the present invention is used.

1 to 5, reference numeral 1 denotes a pipe for mounting the mat of the present invention, and 2 denotes a bag, which is lead (about 1 mm) thick enough to be deformed by its own weight or by applying a slight load. A required number of thin plates 5 are laminated and sealed. Further, a belt loop 7 is provided on the outer skin 6 of the bag body 2, and the belt 3 is inserted through the belt loop 7. Reference numeral 4 denotes a fastener provided at one end of the belt 3, and reference numeral 8 denotes a gap provided between the bag body 2 and the lead thin plate 5.

Since the mat of the present invention is configured as described above, to mount it on the pipe 1, as shown in FIG.
The belt 3 is tightly wrapped around the outer surface of the pipe 1 while applying a slight force to bend the outer circumference of the pipe 1 by applying a slight force to the outer surface of the pipe 1 for shielding the bag body 2. And fix it. At this time, the lead thin plate 5 housed in the bag 2
Is easily deformed because of its flexibility as described above.
In this case, the laminated outer plate and the inner plate have different curvatures. However, since the respective lead thin plates are displaced from each other along the curvature, the resistance to bending is small, and it is easy regardless of the thickness of the mat. Can be transformed into In addition, at this time, since the gap 8 is provided between the end of the lead thin plate 5 and the bag 2, the movement of the lead thin plate 5 in the bag 2 is absorbed as shown in FIG. can do.

As described above, the mat of the present invention can be easily mounted around the pipe regardless of the diameter of the pipe.

In addition, when the diameter of the pipe is large and it is impossible to cover the entire required portion, or when a single mat has insufficient shielding ability, the use of a plurality of sheets can reduce the entire required portion. It can be coated or overlaid.

When the work is completed and the mat of the present invention is removed from the pipe, the mat can be easily removed by releasing the lock of the fastener.

If a tightening tool for loading is used as the tightening tool, a necessary and sufficient tightening force can be obtained, so that safety is favorable and the tightening operation can be simplified.

The belt 3 may be directly attached to the bag 2.

[0020]

As described above, (1) The mat according to the present invention can be easily, reliably and completely attached to a pipe, and can shield radiation emitted from the pipe.

(2) There is no need for complicated work such as forming a lead plate directly into a predetermined shape and transporting it to the site, such as a means for directly winding a lead plate around a pipe. Mounting work can be easily performed.

(3) As compared with a lead bristle mat, by increasing the number of laminated lead thin plates, the shielding capacity can be easily increased with a small thickness, and the production cost can be reduced. It is economical.

(4) Further, a large-scale apparatus such as a method and apparatus using lead particles is not required.

It has the following excellent effects.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a lead mat for shielding pipes of the present invention.

FIG. 2 is an enlarged sectional view of a main part.

FIG. 3 is a sectional view taken along line II of FIG. 1;

FIG. 4 is an enlarged cross-sectional view of a main part showing a state of being curved and deformed.

FIG. 5 is an explanatory diagram showing a use state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piping 2 Bag body 3 Belt 4 Fastener 5 Lead thin plate 6 Outer skin 7 Belt thread 8 Air gap

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G21F 3/00

Claims (1)

(57) [Scope of request for utility model registration] (1) To apply its own weight or a slight load
Multiple layers of lead thin plate with flexibility to deform more
And the end of the laminated lead sheet and the bag
A space is provided between the bag and the bag, and a belt and
And a mounting mechanism consisting of fasteners.
Lead mat for shielding pipes.