JPH0656797U - Lead mat for pipe shielding - Google Patents

Abstract

(57) [Abstract] [Purpose] Lead shielding mat to be attached to the outer periphery of a pipe in which liquids containing radioactivity flow in nuclear facilities, etc. [Structure] Add weight or slight load It is characterized in that lead thin plates having flexibility to such a degree that they are deformed are stacked in layers and housed in a bag body, and that the bag body is provided with a tightening mechanism including a belt and a fastener, and further stacked. A feature is that a gap is provided between the end of the lead thin plate and the bag body. [Effect] With a simple mechanism, it is possible to shield the radiation of the pipe through which the liquid containing radioactivity flows. Further, it can be easily mounted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe-shielding lead mat for shielding a pipe through which a liquid containing radioactivity flows in a nuclear facility or the like.

[0002]

[Prior art]

 In nuclear facilities, the piping through which liquids containing radioactivity flow is the main radiation source. Therefore, in order to ensure the safety of workers and reduce the radiation exposure below a prescribed value when inspecting or modifying pipes or performing work in the vicinity, It is necessary to provide simple shielding.

As this shielding method, there is a means for directly winding a lead plate around the pipe. However, if the lead plate becomes thicker than 3 mm, it becomes extremely difficult to bend. Therefore, in order to carry out this means, it is necessary to perform work such as forming it into a predetermined shape in advance and then transporting it to the site. There are various problems such as not being easy to attach to pipes with different diameters.

Further, there is a mat formed of lead hair. The mat is flexible, 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 hair equivalent to the lead equivalent, which has an effective shielding ability, is more than three times that of the lead plate, requiring a large shielding space. .

Also, in the case of a lead plate and lead hair, since proper consideration is not given to the fixture for attaching to the pipe, a troublesome work such as tightening with a wire on the pipe is required for attachment. And

On the other hand, as disclosed in, for example, JP-A-60-18894, JP-A-61-204593, JP-A-62-76500, etc., for mounting a heavy shielding material, As a method of reducing the labor required, there is a method of shielding the radiation by sending lead particles into a container or bag installed around the piping to be used in advance.

However, these means result in a large-scale work such as a large-scale device for feeding lead particles into a container or the like, a large amount of additional work such as laying pipes, and the like.

[0008]

[Problems to be solved by the device]

 In order to solve these problems, we have developed a shielding material that is highly flexible and has an excellent shielding effect to easily shield the piping that is the radiation source and that can be easily attached to the piping. Is desired.

[0009]

[Means for Solving the Problems]

 According to the present invention, a shielding mat with a belt, which is obtained by stacking lead thin plates in multiple layers and housed in a bag, is wrapped around a pipe serving as a radiation source, and is attached to the pipe by a fastening mechanism including a belt and a fastening tool. It is designed to be attached to the pipe regardless of the outer diameter to provide effective shielding.

That is, the present invention is characterized in that a plurality of lead thin plates are stacked and accommodated in a bag body, and the bag body is provided with a tightening mechanism including a belt and a fastener. Furthermore, the thin lead plate is characterized by being flexible enough to be deformed by its own weight or a slight load, and a space is provided between the end of the stacked thin lead plates and the bag. It is characterized by.

[0011]

[Action]

 Hereinafter, the gist of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory view of a lead mat for pipe shielding of the present invention, FIG. 2 is an enlarged cross-sectional view of an essential part, FIG. 3 is a cross-sectional view taken along the line I-I of FIG. 1, and FIG. 4 is a curved deformation of the mat of the present invention. FIG. 5 is an enlarged cross-sectional view of an essential part showing the state where the mat is made, and FIG.

In FIGS. 1 to 5, 1 is a pipe for mounting the mat of the present invention, 2 is a bag, and a thickness (about 1 mm) that can be deformed by its own weight or a slight load applied to the inside thereof The required number of lead thin plates 5 are laminated and sealed. Further, a belt loop 7 is provided on the outer cover 6 of the bag body 2, and the belt 3 is inserted through the belt loop 7. Reference numeral 4 is a fastener provided at one end of the belt 3, and 8 is 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, when it is attached to the pipe 1, as shown in FIG. While applying a force to bend and deform along the outer peripheral surface, the belt 3 is closely rotated around the outer surface of the pipe 1, and the belt 3 is clamped and locked by the fastener 4 to be fixed. At this time, the lead thin plate 5 accommodated in the bag body 2 is easily deformed due to the flexibility as described above. In this case, the laminated outer and inner plates have different curvatures, but since the lead thin plates are displaced from each other along the curvature, the resistance to bending is small and the thickness of the mat is not affected. It can be easily transformed. Moreover, at this time, since the gap 8 is provided between the end portion of the lead thin plate 5 and the bag body 2, as shown in FIG. 4, the movement of the lead thin plate 5 in the bag body 2 is absorbed. can do.

As described above, the mat of the present invention can be easily attached to the periphery of the pipe regardless of the diameter of the pipe.

If the diameter of the pipe is large and it is not possible to cover the entire required portion, or if the matting ability of one mat is insufficient, using multiple sheets will cover the entire required area. It can be coated or laminated.

When the work is finished and the mat of the present invention is removed from the pipe, it can be easily removed by unlocking the fastener.

If a tightening tool for tightening a load is used as the tightening tool, a necessary and sufficient tightening force can be obtained, which is preferable for safety, and the tightening operation can be simplified.

Further, the belt 3 may be directly attached to the bag body 2.

[0020]

[Effect of device]

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

(2) Further, like a means for directly winding a lead plate on a pipe, it is not necessary to perform a troublesome work such as forming it into a predetermined shape in advance and transporting it to the site, and to a pipe having a different diameter. Installation work can be done easily.

(3) Compared with the lead wool mat, by increasing the number of lead thin plates to be laminated, the shielding ability can be easily increased with a small thickness and the production cost can be reduced. Yes, it is economical.

(4) Furthermore, there is no need for a large-scale device such as the method and device using lead particles.

It has excellent effects such as.

[Brief description of drawings]

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

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

FIG. 3 is a sectional view taken along line I-I of FIG.

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 usage state.

[Explanation of symbols]

 1 Pipe 2 Bag 3 Belt 4 Tightening Tool 5 Lead Thin Plate 6 Outer Skin 7 Belt Through 8 Void

Claims (3)

[Scope of utility model registration request] 1. A lead mat for pipe shielding, characterized in that a plurality of lead thin plates are stacked and accommodated in a bag body, and a mounting mechanism including a belt and a fastener is provided in the bag body. 2. The lead mat for pipe shielding according to claim 1, wherein the thin lead plate is flexible enough to be deformed by its own weight or a slight load. 3. The lead mat for pipe shielding according to claim 1, wherein a gap is provided between an end portion of the laminated lead thin plates and the bag body.