JP3073532U - Lead mat for shielding - Google Patents

Abstract

(57) Abstract: In a shielding lead sheet mat in which a plurality of lead thin sheets 1 are stacked and stored in a bag body 2, one or both sides of the lead thin sheet 1 are partially or entirely unsaturated carboxylic acid. A synthetic resin film 1A mainly composed of polyethylene graft-modified with an acid or a derivative thereof is adhered. [Effect] The bending and restoring work of the laminated lead thin plate is extremely easy. Bending and restoring work can be repeated many times and has excellent durability.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention aims to reduce radiation exposure by shielding facilities, equipment, piping, etc., which become radiation sources in nuclear facilities and nuclear-related services, etc., and to use them to secure the safety of nearby workers. The present invention relates to a lead sheet mat and a method for manufacturing the same.

[0002]

[Prior art]

 Conventionally, lead mats for piping shielding described in Japanese Utility Model Laid-Open Publication No. 6-56797 and laminated mats for shielding lead plates described in Japanese Patent Application Laid-Open No. 7-229999 have been proposed as this type of lead sheet mat for shielding. Have been.

In the former mat, lead thin plates are stacked in multiple layers and stored in a bag body. In the latter mat, in addition to the stacked lead thin plates, a spring plate for restoring the lead thin plates is used. It is a layered product.

[0004] These mats can be wound around piping using a belt or a fastener, or locked to an arbitrary supporting member using eyelets provided in a bag body for accommodating a lead thin plate. It is installed on a predetermined surface of facilities and equipment.

[0005]

[Problems to be solved by the invention]

 However, since the former mat is formed by laminating a plurality of lead thin plates as they are, when this mat is bent, the bent state of the lead thin plate remains due to the properties of the lead plate (work hardening characteristics). For this reason, it is extremely difficult to return to the original flat state.

In the latter mat, the spring plates are laminated so that the bent lead thin plate can be restored. However, even if the spring plate itself can be restored, it is difficult to restore the lead thin plate. In particular, the portion where the lead thin plates are laminated is in an integrated state by bending the entire laminated lead thin plate because the lead plate has high frictional resistance. Therefore, depending on the bending direction, even if only the spring plate is restored apart from the lead thin plate, the lead thin plate may remain bent. In addition, since the lead thin plate is restored using the spring plate, the elastic strength of the spring plate itself becomes a resistance when the mat is bent, and the work of bending the mat or the bent state is performed for a long time. Maintenance work becomes difficult.

[0007] Furthermore, it is known that the lead thin sheet is liable to accumulate metal fatigue, so that when the bending operation is repeated, the strength of the bent portion is deteriorated and the lead thin sheet is easily broken. As described above, the conventional lead plate mat for shielding has left a major problem in durability performance.

Therefore, the present invention has been created to solve the above-mentioned problem, and the bending and restoring work of the laminated lead thin plate is extremely easy, and the bending and restoring work can be repeated many times. The purpose of the present invention is to provide a highly durable shielding lead sheet mat.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, a first means of the present invention is to provide a shielding lead sheet mat in which a plurality of lead sheet sheets 1 are stacked and stored in a bag body 2, on one or both sides of the lead sheet sheet 1, Alternatively, the synthetic resin film 1A mainly composed of polyethylene graft-modified with an unsaturated carboxylic acid or a derivative thereof is bonded. The synthetic resin film 1A is firmly adhered to the surface of the lead thin plate 1.

The second means is one in which one longitudinal end of the laminated lead thin plate 1 is fixed with a fastener 1B. With this fastener 1B, each position of the laminated lead thin plate 1 is kept constant.

The third means is that the bag 2 is provided with a coated glass cloth. With this coated glass cloth, the strength of the bag 2 can be increased.

A fourth means is to use a sheet material 3 for reducing the frictional resistance between the lead thin plates 1 in a shielding lead plate mat in which a plurality of lead thin plates 1 are stacked and stored in a bag body 2. Between the two. The sheet material 3 may be used by being sandwiched between the lead thin plates 1, and each lead thin plate 1 may be individually wrapped by the sheet material 3. The sheet material 3 is made of a flexible and thick material, such as a synthetic resin material or a paper material.

A fifth means is that a coating material 4 for reducing the frictional resistance between the lead thin plates 1 is applied to the lead thin plate 1 in a shielding lead plate mat in which a plurality of lead thin plates 1 are stacked and stored in a bag body 2. It has been applied to the lamination surface. As the coating material 4, for example, a coating material 4 such as an oil paint or a silicone resin is applied to the lead thin plate 1, dried and laminated.

A sixth means is that, in a shielding lead mat in which a plurality of lead thin plates 1 are stacked and stored in a bag body 2, a lubricating material 5 for reducing frictional resistance between the lead thin plates 1 is used. Injection on the lamination surface. As a lubricant, lubricating oil or the like is injected into the laminated surface of the lead thin plate.

According to the present invention, the synthetic resin film 1 A firmly adhered to the surface of the lead thin plate 1, the sheet material 3, the coating material 4, and the lubricant 5 interposed on the laminated surface of the lead thin plate 1 are made of the lead thin plate 1. This is to reduce mutual frictional resistance. Further, since the synthetic resin film 1A is firmly adhered to the surface of the lead thin plate 1, the bending performance and the durability of the lead thin plate 1 are enhanced.

[0016]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The reference numeral 1 shown in the figure is a lead thin plate 1 for shielding radiation, and a plurality of such thin sheets are used (see FIG. 2). The entire lead thin plate 1 thus laminated is laminated so as to be bent by its own weight. Then, any one of the synthetic resin film 1A, the sheet material 3, the coating material 4, and the lubricant 5 is applied to the laminated surface of the lead thin plates 1 in order to reduce the frictional resistance between the lead thin plates.

The synthetic resin film 1A uses a synthetic resin film 1A mainly composed of polyethylene partially or entirely graft-modified with an unsaturated carboxylic acid or a derivative thereof. 1A is firmly adhered to the surface of the lead thin plate 1 (see FIG. 2). In the embodiment, five to six 0.8 mm-thick lead thin plates 1 are used, and a synthetic resin film 1A having a thickness of 75 to 100 μm is adhered to both sides of each lead thin plate 1 so that the mat according to the present invention can be used sufficiently. Radiation shielding effect and extremely free bending / restoring effect have been confirmed (see Fig. 7). Incidentally, the thickness and the number of layers of the lead thin plate 1, the thickness of the synthetic resin film 1A, and the like are appropriately changed according to the size of the mat of the present invention and the place of use.

In the laminated lead thin plate 1, one longitudinal end is fixed with a fastener 1B (see FIG. 2). This connection prevents each lead thin plate 1 from being displaced in the bending / restoring operation, and keeps the stacked lead thin plates 1 in the same position. A stapler is used for the fastener 1B of the embodiment.

In order to firmly adhere the synthetic resin film 1A containing polyethylene as a main component to the surface of the lead thin plate 1, the following laminating method is used.

First, each lead thin plate 1 is heated at an appropriate temperature, and one or both sides of the heated lead thin plate 1 are partially or entirely grafted with polyethylene graft-modified with an unsaturated carboxylic acid or a derivative thereof. A synthetic resin film 1A, which is a main component, is disposed, pressure-bonded by a pressure-bonding device, and temporarily bonded. Next, the synthetic resin film 1A and the lead thin plate 1 temporarily bonded are heated and fused at an appropriate temperature by a heating device to bond the synthetic resin film 1A to the surface of the lead thin plate 1. The synthetic resin film 1A can be firmly adhered by such a laminating method. Even if the synthetic resin film 1A is adhered to the lead thin plate 1 by a method other than this method, the synthetic resin film 1A is bent and restored. The resin film 1A will be easily peeled off.

The sheet material 3 is provided on the laminated surface of the lead thin plate 1 (see FIG. 4). In addition, each lead thin plate 1 can be wrapped with this sheet material. As the material of the sheet material, a material having excellent flexibility and durability, such as a synthetic resin material or a paper material, is suitable, but can be arbitrarily changed as long as it reduces the frictional resistance between the lead thin plates 1.

As the coating material 4, a liquid coating material such as an oil paint or a silicone resin is applied to the laminated surface of the lead thin plate 1 and dried before use (see FIG. 5). The coating material 4 may be applied not only to the lamination surface of the lead sheet 1 but also to the entire lead sheet 1 as shown in the illustrated example.

When the lubricating material 5 is used, the lubricating material 5 such as lubricating oil is injected into the lamination surface of the lead thin plate 1 (see FIG. 6). In this case, the inside of the bag body 2 storing the laminated lead thin plates 1 may be filled with lubricating oil or the like.

The lead thin plates 1 in which the mutual frictional resistance is reduced as described above are stored in a bag 2 in a stacked state. The bag 2 is preferably made of a material having heat resistance and flame retardancy. For example, by using a coated glass cloth, the strength of the bag 2 is increased, and dust and radioactivity attached to the bag 2 can be easily reduced. Can be removed. In addition, in order to facilitate carrying and handling of the mat of the present invention, in the embodiment, the length of the bag 2 is set to 860 mm and 270 mm in width, and 760 mm in length and 230 mm in width and the lead thin plate 1 weighing 10 kg is stored. In addition, the periphery of the lead thin plate 1 is sewn (see FIG. 1). Therefore, the material of the bag body 2 may be changed to another material as long as it can cover and hold the lead thin plate 1 having such a weight size. Further, the sewing means of the bag 2 may be changed together with the change of the material of the bag 2. Further, the sizes of the lead thin plate 1 and the bag 2 can be arbitrarily set according to the place of use or the like.

At the end of the bag 2, an eyelet hole 2A for facilitating mounting of the mat of the present invention is provided (see FIG. 3). The eyelet hole 2A is to be engaged with a support member (not shown) provided near a facility or equipment to be shielded. In the illustrated example, a plurality of eyelets 2 </ b> A are provided at both long ends of the bag 2. Further, a belt or a fastener may be attached instead of the eyelet hole 2A or together with the eyelet hole 2A.

[0026]

[Effect of the invention]

 With the present invention, the original purpose was achieved. That is, as described in claim 1, on one or both surfaces of the lead thin plate 1, a synthetic resin film 1A mainly composed of polyethylene partially or entirely graft-modified with an unsaturated carboxylic acid or a derivative thereof is used. Due to the adhesion, the frictional resistance between the lead thin plates 1 was greatly reduced, and the bending durability of each lead thin plate 1 was successfully improved. As a result, the mat of the present invention can be bent into a free shape, and can be easily installed in a narrow place or a position with a high radiation level.

Furthermore, since the synthetic resin film 1A is strongly adhered to the surface of the lead thin plate 1, the bending durability of each lead thin plate 1 is improved, and even if the bag body 2 is damaged, the lead thin plate 1 It can be used. As a result, the lead sheet 1 can be reused by replacing only the bag body 2, and the waste can be reduced as much as possible, and the lead sheet 1 can be used effectively.

[0028] As described in claim 2, in the laminated lead thin plates 1, one longitudinal end is fixed with the fastener 1B, thereby preventing displacement of each lead thin plate 1 and allowing each of the laminated lead thin plates. Since the thin plate 1 can be kept in the same position, the bent lead thin plate 1 can be restored very easily.

By providing the bag 2 with a coated glass cloth as described in claim 3, the strength of the bag 2 is increased, and removal of dust, radioactivity, etc. attached to the bag 2 is facilitated. For example, the durability of the bag body 2 itself can be enhanced.

Further, by using the sheet material 3, the coating material 4, and the lubricating material 5 as described in claims 4 to 6, the frictional resistance between the lead thin plates 1 can be reduced by using a handy material. be able to.

As described above, according to the present invention, the bending and restoring work of the laminated lead thin plate is extremely easy, and the bending and restoring work can be repeated many times. It can provide a plate mat.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing one embodiment of the present invention.

FIG. 3 is an enlarged front view of a main part showing one embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part showing another embodiment of the present invention.

FIG. 5 is an enlarged sectional view of a main part showing another embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a main part showing another embodiment of the present invention.

FIG. 7 is a perspective view showing a bending example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lead thin plate 1A Synthetic resin film 1B Fastener 2 Bag 2A Eyelet hole 3 Sheet material 4 Coating material 5 Lubricant

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toru Konishi 1-1-14 Uchikanda, Chiyoda-ku, Tokyo Inside Hitachi Plant Construction Co., Ltd. (72) Shozo Tamura 1-17-11, Tokiwa, Koto-ku, Tokyo No. Nitto Kako Co., Ltd. (72) Inventor Akira Yasunaga 1-1-17 Tokiwa, Koto-ku, Tokyo Nitto Kako Koki Co., Ltd.

Claims (6)

[Utility model registration claims] 1. A shielding lead sheet mat in which a plurality of lead sheets are stacked and housed in a bag body, one or both sides of the lead sheets are partially or entirely graft-modified with an unsaturated carboxylic acid or a derivative thereof. A lead sheet mat for shielding, wherein a synthetic resin film mainly composed of polyethylene is adhered. 2. The lead mat for shielding according to claim 1, wherein one longitudinal end of the laminated lead thin plate is fixed with a fastener. 3. The shielding lead plate mat according to claim 1, wherein the bag body is provided with a coated glass cloth. 4. A shielding lead sheet mat in which a plurality of lead sheets are stacked and stored in a bag body, wherein a sheet material for reducing frictional resistance between the lead sheets is interposed between the lead sheets. Leading mat for shielding. 5. A shielding lead sheet mat in which a plurality of lead sheets are stacked and housed in a bag body, wherein a coating material for reducing frictional resistance between the lead sheets is applied to a stacking surface of the lead sheets. Lead sheet mat for shielding. 6. A shielding lead sheet mat in which a plurality of lead sheets are stacked and housed in a bag body, wherein a lubricant for reducing frictional resistance between the lead sheets is injected into a stacking surface of the lead sheets. Lead sheet mat for shielding.