JP3125866B2 - Radiation shield - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of radiation shields used to protect workers in a radiation environment from radiation exposure.

[0002]

2. Description of the Related Art When performing any operation in a radiation environment, a radiation shield is used as a means for protecting workers engaged in the operation from radiation.

One example of the radiation shield is disclosed in Japanese Utility Model Application Laid-Open No. 61-14 / 1986.
It is proposed in JP 7998.

In the proposed radiation shield, a pipe having a substance emitting radiation is covered with a bag made of synthetic resin, and a radiation shielding liquid such as water or an aqueous sodium borate solution is injected into the bag. The radiation is shielded by the radiation shielding liquid.

[0005] In the proposed example, a plurality of bags are connected to each other with a fastener around the outer circumference of a pipe having a substance emitting radiation, and the connected bags are used by being wound around the outer circumference of the pipe.

Therefore, the pipe supports a plurality of bags and the shielding liquid.

[0007] In a radiation shielding operation in which a radiation shield is wound around pipes or equipment having a substance that emits radiation, it is necessary for an operator engaged in the operation of winding the radiation shield around piping or equipment to approach the piping or equipment. There was a risk that the worker would be exposed to radiation.

If the pipes and equipment are covered with a heat insulating material, the work of removing the heat insulating material before winding the radiation shield around the pipes and equipment is involved. There was a danger that the radiation dose of workers engaged in the work would increase.

When a method is used in which a radiation shield is wound around the pipe or equipment to cover the pipe or equipment, the pipe or equipment has a complicated shape, for example, a nozzle or valve is attached in the middle of the pipe. Or the elbow part of the piping or T of the piping
In the case of a mold branch, it is difficult to wind the radiation shield around the part, which is troublesome, and there is a danger that the worker engaged in the work of winding the radiation shield around the part will receive a large amount of radiation. Occurs.

Japanese Patent Application Laid-Open Nos. 59-12398 and 8-211192 disclose a radiation shielding body in which a radiation shielding liquid such as water is sealed in a resin or metal container. It is known from Japanese Unexamined Patent Publication No. Hei 6-230178.

These known examples are based on the fact that a container in which a liquid such as water is sealed as a radiation shielding liquid is used independently and installed on the floor, so that there is no obstacle on the floor. It was difficult to install in a narrow part.

Further, the height cannot be increased because water is contained in the inside, and radiation cannot be shielded in a wide area in the vertical direction by one container.

In order to increase the vertical coverage of a single radiation shield and to shield radiation in a narrow space, a lead plate or a lead bristle is provided between a radiation emitting device and a worker. Japanese Patent Application Laid-Open No. 7-84091 discloses a radiation shield that is used by suspending or standing a thin and widely processed product in a mat shape.

[0014]

However, the radiation shielding body obtained by processing the lead plate or the lead hair into a mat shape has a specific gravity much larger than that of the radiation shielding liquid. It is not easy to handle such as attaching, removing and moving the radiation shield because the weight becomes heavy, and while handling the radiation shield in the radiation environment, the amount of radiation that workers engaged in the Many dangers arise.

Therefore, an object of the present invention is to provide a good handleability,
It is an object of the present invention to provide a radiation shield capable of reducing the radiation exposure of workers engaged in setting, removing, and moving the radiation shield.

[0016]

[0017]

The above object of the present invention has been attained.
Radiation shield alone is used to
The first means as a single radiation shield is a bag,
A reinforced wall connecting the opposing inner walls of the body
A supply / drainage port for the radiation shielding liquid provided in the storage bag,
Equipped at the end of the bag to suspend the bag
And a hole for engaging the connecting means used when
Are opposed to each other at least at the upper end of the bag.
A liquid-tight structure is formed by superimposing a plurality of surfaces that meet each other,
Radiation characterized by being equipped in a part constructed in
It is a shield alone. According to this first means, the bag body
With the radiation shielding liquid inserted through the supply / drain port,
Radiation shielding by suspending through the connecting means in the hole
With the enclosure alone in a vertical position, the radiation shielding liquid is
Widely distributed in vertical plane, radiation was widely distributed in vertical
It is shielded by the radiation shielding liquid in the bag. Also bag
The body is compact when there is no radiation shielding liquid inside the bag
And the bag and the radiation shielding liquid are discharged from the supply / drain port.
Supply and discharge radiation shielding liquid and treat it individually.
So that the bag can be suspended and supported
It is easy to handle tasks such as In addition, in the vicinity of the hole, a plurality of surfaces of the material constituting the bag are overlapped to increase the strength and to be in a liquid-tight state, and the liquid leaks from the hole when the radiation shielding liquid is put in the bag. And the effect of compensating for the lack of strength around the hole when hanging up.

The second means is the same as the first means, wherein the portion provided with the hole is a liquid-tight portion formed by overlapping a plurality of opposing surfaces of the bag body with a metal plate interposed therebetween. The radiation shielding body is characterized by the following features. In addition to the function and effect of the first means , the radiation shielding ability of the radiation shielding body is prevented by a metal plate in a region where there is no radiation shielding liquid. The effect that the metal plate reinforces the periphery of the hole and the effect of suppressing breakage when the radiation shielding body is used by being suspended and supported can be obtained.

[0019] Similarly third means, in the first means or the second means <br/>, bag is radiation shield itself being flattened configuration of a resin sheet, according to the first means or the second means In addition to the function and effect, since the bag body is flat, the radiation shielding liquid put in the bag body has a flat distribution and is widely distributed in the radiation shielding area, so that the radiation shielding area of the radiation shielding body alone can be secured widely. In addition to the function and effect, the material of the bag is made of resin sheet.
The bag is light and extremely flexible, and when there is no radiation shielding liquid in the bag, the bag can be easily compacted and handled, and the radiation shield itself can be easily handled. Can be

The radiation shield using the radiation shield alone is as follows: the fourth means is a hole provided in the radiation shield alone by mounting a plurality of the radiation shields by the first means from a frame. The radiation shield is provided with the radiation shield alone in the frame suspended and supported via the coupling tool engaged with, while taking advantage of the good handleability of the radiation shield alone by the first means , By suspending and supporting a plurality of radiation shields alone from the frame via the connector, an operation and effect that a wide vertical surface can be easily provided as a radiation shield surface can be obtained.

Similarly, the fifth means is a radiation shield in which a plurality of radiation shields alone are arranged vertically and horizontally in the frame and provided in a frame in the fourth means. > In addition to the function and effect described above, the function and effect that the vertical plane for achieving radiation shielding can be expanded vertically and horizontally.

A sixth means is the fifth means, wherein the frame is made of metal wrapped in a horizontal direction with a vertical gap between each of the radiation shields in the vertical direction and a portion of the radiation shield only in a liquid-tight manner. Radiation shield equipped with a frame of the above, in addition to the effect of the fifth means , in addition to the vertical gap of each radiation shield in the vertical direction and the portion of the radiation shield alone configured in a liquid-tight manner The metal frame wraps in the horizontal direction, and the metal frame has the effect of shielding the radiation arriving at the gaps and portions, so that the effect of improving the shielding ability of the radiation shield can be obtained.

The seventh means is the radiation shield according to the sixth means, wherein each of the radiation shields arranged vertically is independently supported by a frame and independently suspended from the frame .
In addition to the functions and effects of the six means , each radiation shield alone arranged in the vertical direction is independently suspended and supported by the frame, so that the weight of the lower radiation shield alone is reduced by the weight of the upper radiation shield alone. Even if the bag body is made of a thin material lightly to improve the handleability without adding, the effect of expanding the radiation shielding surface in the vertical direction without damaging the radiation shielding body alone can be obtained.

The eighth means is the same as the seventh means , except that a hole is provided in a liquid-tight portion located at the lower end of each radiation shield alone, and the lower end is connected to a frame. A radiation shield, in addition to the function and effect of the seventh means , the lower end of each radiation shield alone is received by the frame to prevent the swing movement, and the function of preventing the generation of the gap caused by the shake movement is obtained; By this action, spot-like radiation leakage can be prevented from occurring, and the effect of suppressing a decrease in the radiation shielding function can be obtained.

A ninth means is the fourth means , wherein in the fourth means , a hole is provided in a liquid-tight portion located at a lower end portion of each radiation shield alone, and the radiation shields adjacent to each other in the horizontal direction are provided. A radiation shield having a single unit connected by a connecting means passing through the hole at the lower end. In addition to the function and effect of the fourth means , the lower end portions of the adjacent radiation shields are connected and adjacent to each other. Since an effect of preventing a gap from being generated between the radiation shields can be obtained, the effect of suppressing a decrease in the radiation shielding function by the effect can be obtained.

Similarly, the tenth means is the fourth means ,
Equipped with a hole in the liquid-tight part located at the lower end of the radiation shield unit above each vertically adjacent radiation shield unit, each radiation shield unit is vertically adjacent to each radiation shield The radiation shield is a series of radiation shields connected to the holes provided in the shield alone through a connector. In addition to the effects of the fourth means , the lower radiation shield alone is suspended from the upper radiation shield alone. Therefore, an effect that the radiation shielding area in the vertical direction can be expanded by a plurality of radiation shielding bodies even if a frame does not exist at the boundary between the radiation shielding bodies in the vertical direction.

[0027] Similarly, the eleventh means includes the fourth to tenth means.
In any one of the means up to the means, the frame is a radiation shield movably supported by wheels .
In addition to the function and effect of any one of the means to the tenth means , the operation of moving the frame to the radiation shielding position and installing and removing the radiation shielding body from the radiation shielding position can be easily performed by the operation that the frame can be moved by the wheels. The effect which can be performed is obtained.

Similarly, the twelfth means is the fourth means ,
A radiation shielding body in which a connecting member is movably mounted on the frame along the frame. In addition to the effect of the fourth means , the connecting member is suspended along the frame by moving along the frame. The radiation shield alone has the effect of being able to move along the frame, and by that action, even if the frame is fixed, the radiation shield can be moved to the radiation shielding position, installed, or removed from the radiation shielding position. Work can be easily performed, and a part of the installed radiation shield can be moved with little force along the frame to easily secure an access frontage through which workers can pass between the part and other parts. In addition, the access becomes easy, and the access frontage can be secured near the work object, so that the start of the work on the work object is expedited and the radiation exposure of the worker can be suppressed.

Similarly, the thirteenth means is a frame having a horizontal frame installed at least in two vertical stages on an upright column, and connecting means mounted on each of the horizontal frames at intervals in the horizontal direction. A plurality of bags containing a radiation shielding liquid, which are detachably suspended from the connection means and reinforced by reinforcing walls connecting the inner walls facing each other, and the radiation provided on the bags. A radiation shielding body comprising a shielding liquid supply / discharge port, and a metal radiation shielding plate supported at the column and provided at a height that wraps between intervals of the bag bodies disposed vertically. The plurality of bags are arranged in a vertical plane, and the radiation shielding liquid in the bag is distributed vertically and in a wide range. Wide shielding surface can be secured Above, the widely distributed radiation shielding liquid is divided and put into a plurality of bags, so that it is easy to hold a desired thickness of the radiation shielding liquid layer on a vertical surface by reinforcement with a reinforcing wall, Since the individual bags are also separated from each other, the individual bags can be handled individually, and a vertical and wide radiation shielding surface can be easily secured. Since the radiation that passes through the interval is shielded and contributes to reliable radiation shielding, the effect of being able to easily and reliably provide radiation shielding on a wide vertical surface is obtained.

A fourteenth means is the thirteenth means , wherein the lower horizontal frame is made of metal, and the radiation shielding plate is formed of the lower horizontal frame of the bag body disposed vertically. The radiation shielding body is configured to be widened up to the vertical width overlapping with the interval, and the function of the frame of the frame to perform the function of the radiation shielding plate in the thirteenth means is obtained. And it can be simple.

The fifteenth means is the radiation shield in which the frame is movably supported by wheels in the fourteenth means. In addition to the functions and effects of the fourteenth means ,
The effect that the frame is moved by the wheels makes it easy to change the radiation shielding position.

Similarly, the sixteenth means includes the fourth means to the fifteenth means.
In any one means to means, the bag is radiation shield that is flat composed of a resin sheet, a fourth hand
In addition to the function and effect of any one of the steps from the step to the fifteenth means , the radiation shielding liquid placed in the bag body is widely distributed in the radiation shielding area with a flat distribution because the bag is flat, The function and effect of securing a wide radiation shielding area of the radiation shielding body alone can be obtained, and since the material of the bag is a resin sheet-like material, the bag is light and extremely rich in flexibility. When there is no radiation shielding liquid in the bag, the bag can be easily made compact and handled, and the operation and effect of the radiation shield alone can be easily obtained.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a bag 1 is formed by welding or bonding polyurethane sheets.
The upper and lower portions are flattened with the metal plate 2 interposed therebetween.

The metal plate 2 and the upper and lower portions of the bag are joined by welding or bonding to form a region into which liquid does not enter.

On the upper and lower parts of the bag 1, an eyelet metal fitting 3, which is a metal hollow annular member, is provided with a metal plate 2 and a bag 1
It is mounted so as to penetrate through the flat part.

As shown in FIG. 1, the number of the eyelet fittings 3 is two at the upper part of the bag 1 at a horizontal interval and two at the lower part at a horizontal interval.

As shown in FIG. 1, the bag 1 is provided with two water supply / drain ports 4 at upper and lower positions.

In order to increase the mounting strength of the water supply / drainage port 4 and the strength around the water supply / drainage port 4 with the metal plate 2, the water supply / drainage port 4 is installed at a height where the metal plate 2 exists.

These water supply / drain ports 4 are used for supplying water into the bag 1 and discharging water from the inside of the bag 1 to the outside.
A structure to which a hose for water supply and drainage can be connected, and when the hose is connected to the water supply and drainage port 4, the water supply and drainage port 4 automatically opens, and when the hose is removed from the water supply and drainage port 4, the water supply and drainage port 4 automatically closes. It has a configuration.

Regarding the opening and closing of the water supply / drain port 4,
It is permissible to open and close the water supply / drain port 4 by pulling or inserting a tightly fitted plug.

In this case, in addition to the work of connecting and disconnecting the hose to the water supply / drain port 4 and the work of inserting and removing the plug, the connection and release of the hose to the water supply / drain port 4 takes time, and The effect in terms of reducing exposure is reduced.

The inside of the bag 1 is provided with a reinforcing wall 5 welded or bonded to the inner wall surface of the bag 1.

The reinforcing wall 5 may have a continuously curved shape as shown in FIG. 2, or may have a sectional shape as shown in FIGS. 10, 11, 12, and 13. .

Each of the reinforcing walls 5 is provided inside the bag 1 as shown in FIG.
As shown in the figure, the bag 1 is vertically long, and divides the inside of the bag 1 into a plurality of cells. In order to spread the radiation shielding liquid in the plurality of cells, flow holes 6 through which the radiation shielding liquid can pass are formed in the reinforcing wall 5 in some places.

Such a bag 1 is used as a means for shielding radiation, for example, to prevent workers engaged in maintenance and inspection in a radiation environment in a nuclear power plant from being exposed to radiation.

Specifically, it is used as follows.

First, a frame 7 is installed horizontally above a position where radiation is to be shielded in a building equipped with piping and equipment for emitting radiation.

The frame 7 is a horizontal beam supported on a floor or supported by a column supported from the ceiling.

In the frame 7, as seen in FIG.
The upper part of the S-shaped hook-shaped connecting member 8 is hooked, and the lower part of the S-shaped hook shape is inserted into the eyelet fitting 3 of the bag 1 and hung on the bag 1.

As a result, the bag 1 is suspended from the frame 7 using the S-shaped hook as the connecting member 8.

The upper part of the intermediate connector 9 having hooks at the upper part and the lower part is hooked on the eyelets at the lower part of the bag 1 suspended and supported.

The lower part of the intermediate connector 9 is the lower bag 1
Is connected to the lower bag 1 by being inserted into the upper eyelet metal fitting 3.

In this way, the plurality of bags 1 are connected vertically and the plurality of bags 1 are suspended from the frame 7 and arranged at a height necessary for shielding radiation.

When the radiation to be shielded is strong, FIG.
A plurality of bags 1 are horizontally wrapped and suspended and supported.

As shown in FIG. 4, the hanging means 8 has a connecting member 8 to be hung on a frame 7 having a double hook shape having a round upper hook shape and a lower hook having left and right hooks.

The upper part of the connecting member 8 is hung on the frame 7,
The lower hook is inserted into the eyelet fitting 3 on the upper part of the bag 1.

This state is the same for the left and right bags 1 in FIG.

In this manner, the upper bag 1
Is suspended and supported by the connector 8.

The lower bag 1 is connected to the lower portion of the upper bag 1 by an intermediate connector 9 and suspended and supported, similarly to FIG.

A hose connected to a water supply pump is connected to the water supply / drain port 4 at the lower part of each bag 1 so that the water stored in the water tank by the water supply pump is connected to the radiation shielding liquid. As each bag through hose 1
Water.

When each of the bags 1 is supplied with water, the gas present in the bags 1 is exhausted from the water supply / drain port 4 at the top of each of the bags 1 as the water level in the bag 1 rises.

One end is connected to the water supply / drain port 4 at the top of each bag 1 so that the air can be exhausted, and the other end of the hose for air discharge opened to the building is connected, and the water supply / drain port 4 at the top is opened. State.

Therefore, the gas in each bag 1 is
Is exhausted into the building from a water supply / drain port 4 on the upper part of the building through a hose connected to the water supply / drain port 4.

After sufficient water is supplied to each bag 1, each hose is removed from the water supply / drain port 4, and radiation to workers who work in the area behind the bag 1 when viewed from piping or equipment that emits radiation. Is blocked by the water in the bag 1.

When water is poured into each bag 1 in this manner, the lower portion of the bag 1 tends to swell due to the weight of the water. The inner walls facing each other in the bag 1 are connected and blocked.

For this reason, the deformation of the bag 1 is small, and the thickness of the water layer in the bag 1 in the horizontal direction becomes substantially uniform in the vertical direction.

For this reason, the radiation is evenly shielded by the water in the bag 1, and no unevenness in shielding occurs.

When each bag 1 is suspended and supported as shown in FIGS. 3 and 4, there is an area where water does not exist in the upper portion of the upper bag 1 and also near the connecting portion of each bag 1 between the upper and lower stages. However, the radiation shielding function of that region is provided by the metal plate 2 to minimize the passage of radiation.

In particular, in the case where a plurality of bags 1 are wrapped and suspended in a horizontal direction as shown in FIG. 4, the thickness of a horizontal water layer contributing to radiation shielding is doubled, so Demonstrates a powerful radiation shielding function.

When supplying water to each bag 1, a hose connected to a water supply pump is connected to the lower supply / drain port 4 of the lower bag 1, and the upper / lower supply / drain port 4 of the lower bag 1 is connected. Are connected by a hose, and an exhaust hose is connected to the water supply / drain port 4 on the upper part of the upper bag 1,
Since the water sent by the water supply pump enters the lower bag 1 and then into the upper bag 1, the situation in which the hose connected to the water supply pump is connected to each bag 1 can be reduced.

While the worker is working, the bag 1 is maintained in a state in which water is injected.
The large load concentrates on the portion of the bag 1 on which the intermediate connector 9 is hung, and the bag 1 is easily damaged.
Has an effect of increasing the strength as a reinforcing plate and can suppress the breakage.

After the work by the worker is completed, each hose is connected to the bag 1 in the same manner as in the water supply state, the hoses are disconnected from the water supply pump, and the water is drained in the opposite direction to the flow of the water in the water supply state. The gas is guided into the bag 1 through an exhaust hose.

After the water in the bag 1 is drained from the water supply / drain port 4 in this manner, the bag 1 is lightweight.
The work of removing the bag 1 from the frame 7 and shaping it can be easily performed.

Since the bag 1 is lightweight, it is easy to handle, and it is possible to prevent the worker who handles the bag 1 from increasing the radiation exposure by taking time to handle the bag 1 in a radiation environment.

The frame 7 may be a structural member of a building as long as it can support the load of the bag after water supply. For example, a handrail of a staircase installed in the building may be used as the frame.

When the handrail is used as a frame, the bag can be suspended from the handrail to protect workers passing through the stairs from radiation.

Since the lower end of the bag 1 suspended from the frame 7 is not fixed to the frame 7, the lower end may move or move due to an external force. As a result, a gap may be generated between the adjacent bags 1 and radiation may leak. There is.

In order to eliminate the concern, the U-shaped bolt 3 shown in FIG.
16 and 17, the collar 31 is fitted to the end from the opposite side, and a wing nut 32 is screwed into a threaded portion of the end to tighten the collar 31. The generation of a gap between the matching bags 1 is minimized.

The bag 1 shown in FIG. 5 is a partial modification of the bag 1 shown in FIG.
Is the eyelet fitting 3 shown in FIG.

The specific content of the change is that the eyelet 3 is abolished, and the connecting metal 10 is placed at the position where the eyelet 3 was located.
Is fixedly installed.

The connection metal fitting 10 has a shape of a bolt head at a portion protruding to the right as viewed in FIG. 5B. Of the connection metal fittings 10, the connection metal fitting 10 located at the upper part of the bag 1 is used. Is connected to a hanging metal fitting 11.

A continuous opening 12 having a large diameter at the bottom and a small diameter at the top is provided at the upper part of the hanging metal fitting 11, and the large diameter is large enough to allow the head of the connecting metal fitting 10 to pass therethrough. Is a diameter through which the head of the connection fitting 10 cannot pass, and has a size through which a thin portion adjacent to the head can pass.

The other structure is the same as that of the bag 1 of FIG.

The bag 1 shown in FIG. 5 is used as follows.

That is, a hollow frame 7 as shown in FIG.
Is horizontally supported from a pillar standing on the floor or the ceiling of a room in the building.

Inside the hollow structure of the frame 7, a bogie 13 as shown in FIG.

A plurality of the trucks 13 are mounted on the frame 7 as shown in FIG.

A member having a horizontal projection 15 on which the hanging fitting 11 of the bag 1 can be hung is supported by the carriage 13.

The opening 12 of the hanging bracket 11 of the bag 1 is hooked on the horizontal projection 15, and the upper bag 1 is suspended from the frame 7 via the carriage 13.

The opening of the hanging metal fitting 11 of the lower bag 1 is hooked to the connecting metal fitting 10 below the upper bag 1, and the lower bag 1 is suspended from the lower part of the upper bag 1.

As shown in FIG. 6, the upper and lower multistage bags 1 are arranged in two rows on the right and left sides, and are arranged in a plurality of rows in the longitudinal direction of the frame 7 in accordance with the number of carts.

The attachment of the bag 1 to the frame 7 is performed in a place that is hardly exposed to radiation exposure.

After the bag 1 is suspended and supported by the frame 7 via the bogie, the bogie is moved along the frame 7 to move the bag 1 to the radiation shielding position.

Thereafter, water is supplied to each bag 1 to provide radiation shielding.

The method of supplying water to each bag 1 is shown in FIG.
It is the same as the method used to supply water.

After radiation shielding is no longer necessary,
Water is drained from the bag 1 in the same manner as the method of draining water from the bag 1 in FIG. 1, and the traveling cart is moved along the frame 7 to the storage position of the bag 1.

The bag 1 may be moved to the radiation shielding position after water is supplied to the bag 1, or the bag 1 may be moved to the storage position of the bag 1 while the bag 1 is filled with water. .

In any case, the movement of the bag 1 is easily and quickly performed by the traveling of the cart 13.

As described above, in the system in which the bag 1 is suspended and supported by the frame 7 via the carriage 13, the bag 1 is placed along the frame 7.
To easily change the radiation shielding position.

Since the plurality of carts 13 are not connected to each other, if the adjacent carts 13 are moved away from each other, the work between the adjacent bags 1 supported by the adjacent carts 13 can be performed. The frontage that the member can pass can be made.

The movement of the bag 1 is accompanied when the frontage is made, and the movement can be easily performed with a small force by moving the carriage 13 hanging the bag 1 along the frame 7.

The frontage is formed at a position as short as possible to the work object, and the worker can pass through the frontage and access the work object at the shortest distance. Personnel can return through the frontage into the radiation-shielded area at the shortest distance. Therefore, radiation exposure of workers is suppressed.

The embodiment shown in FIG. 9 is an example using the bag 1 of FIG. 1, and the structure of the bag 1 is the same as the structure of the bag 1 shown in FIG.

The frame 7 for suspending and supporting the bag 1 is supported by wheels 16 with casters having a horizontal turning function.

As shown in FIG. 9, the concrete structure of the frame 7 is to horizontally support a horizontal frame 17 having two upper and lower stages with a column 18, and fix the column 18 to a bogie frame 19 by vertically fixing it. Wheels 16 with casters are attached to the bogie frame 19 so as to freely turn horizontally.

The upper and lower two-level metal horizontal frame 1
At 7, a plurality of hooks 20 are fixed at intervals equal to the horizontal interval of the eyelet fittings 3 of the bag 1 in the horizontal direction.

When attaching the bag 1 to the frame 7, the eyelet metal fitting 3 on the upper part of the bag 1 is hooked on the hook of the upper horizontal frame 17, and is suspended from the frame 1 as shown in FIG.

Similarly, the eyelets 3 on the upper part of the bag 1 are hooked also on the hooks 20 of the lower horizontal frame 17, and the bags 1 are mounted on the frame 7 in a plurality of vertical and horizontal rows.

Thus, all the hooks 20 of the frame 7 are
Hook bag 1

The attachment of the bag 1 to the frame 7 is performed in a place that is hardly exposed to radiation exposure.

Thereafter, the frame 7 is moved to the radiation shielding position by rotating the wheels 16 by pressing the bogie frame 19 or the like.

Since the wheels 16 are provided with casters and can freely turn horizontally, they can freely move in the horizontal two-dimensional direction on the floor.

Thereafter, water is supplied to each bag 1 to provide radiation shielding.

The method of supplying water to each bag 1 is the same as the method described above.

After the water is supplied to each bag 1, the water in the bag 1 functions to shield the radiation. However, in the vicinity of the eyelet fitting 3 where water does not spread, the metal plate 2 attached to the bag 1 is used. And the lower horizontal frame 17 has a function of shielding radiation.

In order to fulfill its function sufficiently, the horizontal frame 17 below the upper horizontal frame 17 has a wide shape in the vertical direction, and the horizontal frame 17 below the lower end of the upper bag 1 And the upper part of the upper bag 1 is wrapped horizontally.

Therefore, if each bag 1 is not damaged when the bags 1 are suspended by the hooks 20, the lower horizontal frame 17 shields the radiation.
May be configured by removing the metal plate 2.

After radiation shielding is no longer needed,
Water is drained from each bag 1 in the manner described above.

Thereafter, the frame 7 supporting the bag 1 in a suspended manner is provided.
Is moved back to its original position.

Since the movement of the plurality of bags 1 is performed at once for each frame 7 by using the wheels 16, the movement can be performed easily and quickly.

Water supply to the bag 1 and drainage from the bag 1 may be performed in a place that is hardly exposed to radiation, and the movement of the bag 1 or the frame 7 may be performed with the bag 1 filled with water. This is also effective as a means for allowing the wheels 16 to move easily and quickly.

The height of the upper frame 7 is at a height of more than 2 meters from the position of the floor on which the wheels 16 run, but the bag 1 is made of a large amount of urethane-based sheets, so that it is lightweight. Therefore, the operation of hooking the bag 1 on the hook can be performed safely and easily.

In any of the above-described embodiments, if it is considered that the bag 1 is sufficiently filled with water, as shown in FIG. It is preferable that the water supply / drain port 4 on the upper side of the bag 1 is provided on the upward surface of the bag 1.

When sufficient drainage from the bag 1 is taken into consideration, as shown in FIG. 15, the water supply / drain opening 4 at the lower part of the bag 1 is set in the posture of the bag 1 used at the time of radiation shielding. Is preferably mounted on the downward surface.

When the load for supporting the bag 1 is dispersed, two eyelet fittings 3 are attached to the upper part and the lower part, respectively, and are increased to three as shown in FIG. You may let it.

As shown in FIG. 15, the size of the bag 1 is such that the overall length L in the vertical direction is about 1 meter, the width W is about 36 cm, and the thickness T is 5 cm in the posture state of the bag 1 used at the time of radiation shielding. The degree of each bag 1
It is preferable to reduce the weight of the material to improve the handleability.

The weight of the bag 1 with water is about 17 kg.

If such a bag 1 is damaged, it is incinerated as waste. However, if a large number of non-incinable members such as the metal plate 2 are included in the bag 1, the waste will be treated. Since the weight of the metal plate 2 increases in handling when used as a radiation shield, it is necessary to take measures such as reducing the amount of water in the bag.

The following embodiments can be provided for the purpose of incineration and weight reduction.

That is, in this embodiment, the configuration of the bag 1 described is improved.

The improvement is shown in FIG.
The metal plate 2 existing around the eyelet metal fitting 3 is removed, and instead, the urethane-based sheet constituting the bag 1 is laid in two layers near the eyelet metal fitting 3 and reinforced by bonding or welding. .

The eyelet fitting 3 is provided at the overlapping portion.

The bag 1 shown in FIG. 19 is provided with any one of the reinforcing walls 5 shown in FIGS. 10 to 14.

The other structure of the bag 1 shown in FIG. 19 is the same as the structure of the bag 1 described in the other embodiments.

In the bag 1 shown in FIG. 19, since the metal plate 2 does not use the function of reinforcing the periphery of the eyelet fitting 3,
When the number of the eyelet fittings 3 is increased and the bag 1 is suspended, the own weight of the bag 1 in which water is contained is distributed to three suspension support points.

The bag 1 shown in FIG. 19 is used as shown in FIG.

That is, the frame 7 is used to suspend and support the bag 1.
Use

As shown in FIG. 20, the structure of the frame 7 is such that a column 42 is fixed to a trolley frame 41 which can be moved by wheels 40 with casters, and the column 42 is made of metal and has three vertical stages. The frames 43, 44, 45 are fixed.

Upward hooks 46 are fixed to the upper horizontal frame 43 at the same horizontal interval as the distance between the eyelet fittings 3.

On the suspended horizontal frame 44, downward hooks 47 and upward hooks 48 are fixed with a vertical interval and the same horizontal interval as that of the eyelet fitting 3.

A downward hook 49 is fixed to the lower horizontal frame 45 at the same horizontal interval as that of the eyelet fitting 3.

The upper eyelet 3 of the bag 1 shown in FIG. 19 is hooked on the hook 46, and the lower eyelet 3 of the bag 1 is hooked on the hook 47.

A plurality of bags 1 hooked on the hooks are arranged in a horizontal direction.

The eyelet fitting 3 on the upper part of the bag 1 in FIG. 19 is hooked on the hook 48, and the eyelet fitting 3 on the lower part of the bag 1 is hooked on the hook 49.

The bags 1 hooked on the hooks are arranged in a plurality in the horizontal direction.

Therefore, a plurality of bags 1 are suspended and supported side by side in the vertical and horizontal directions.

The timing at which the bag 1 is hooked on each hook may be performed after the frame 7 is moved to the radiation shielding position, or before that time, in a place where the radiation intensity is low.

Thereafter, water is supplied into the bag 1 in the same manner as in the above-described embodiment to provide radiation shielding.

When the bag 1 shown in FIG. 19 is used for radiation shielding, since there is no water effective for shielding radiation near the eyelet fitting 3, the radiation shielding function is changed to another configuration. Need to ask.

In the embodiment shown in FIG. 20, the upper and lower horizontal frames 43, 44, and 45 function to shield radiation.

That is, three horizontal frames 43, 4
4 and 45 are horizontally wrapped with portions of each bag 1 where water is not present, and the upper and lower horizontal frames 43 and
44 and 45 shield radiation.

In particular, the suspended horizontal frame 44 is wider in the vertical direction than the other horizontal frames, and serves to close the gap between the upper bag 1 and the lower bag 1, and the gap is exposed to radiation. Preventing passage.

In the example of FIG. 20, even when the frame 7 is moved by the wheels 40 or an external force such as an earthquake acts on the bag 1, the bag 1 is hooked on the frame 7 at the upper end and the lower end. Therefore, no gap is generated between the adjacent bags 1 due to the bag 1 fluctuating, and the radiation can be reliably shielded.

After the radiation shielding operation is completed, the water in the bag is drawn out in the same manner as in the above-described embodiment to reduce the weight, and then the frame 7 and the bag 1 are removed.

The size of the bag 1 shown in FIG. 19 has the same weight and dimensions as those of the other embodiments shown in FIG. 9, and the total length L in the vertical direction is 1 in the posture state of the bag 1 used at the time of radiation shielding.
By adjusting the width to about 36 cm and the width to about 5 cm, the weight of the bag 1 is kept within about 0.5 kg and the handleability is improved.

The weight of the bag 1 with water is about 17 kg.

[0157]

[0158]

Effects of the Invention According to the present invention, advantage hole of the bag body
Can be easily suspended and supported, making it easy to radiate
Radiation shielding liquid is widely distributed on a vertical surface, and the radiation shielding area
And the bag is made of radiation shielding liquid
Can be made compact when not in the bag, and
Radiation shielding liquid is supplied from the supply / drain port
Can be handled individually by dropping or discharging.
Handle work such as suspending and supporting the body
In addition to the above, the area near the hole formed in the bag body is formed by stacking a plurality of surfaces of the material constituting the bag body to increase the strength and to be in a liquid-tight state, and the radiation shielding liquid is put in the bag body. This has the effect of compensating for liquid leakage from the hole in the case and insufficient strength around the hole when suspended.

According to the invention of claim 2, in addition to the effect of the invention of claim 1 , the radiation shielding ability of the radiation shield alone is enhanced by blocking the transmission of radiation in a region where the radiation shielding liquid is not provided by the metal plate. The effect which can be obtained and the effect which suppresses breakage at the time of using the radiation shield alone while suspending and supporting the radiation shield by reinforcing the periphery of the hole with the metal plate are obtained.

According to the invention of claim 3, claim 1 or contract
In addition to the effect of the invention according to claim 2 , since the bag body is flat, the radiation shielding liquid put in the bag body has a flat distribution and is widely distributed in the radiation shielding area, and the radiation shielding body alone has the radiation shielding liquid. The effect of securing a wide area can be obtained, and the bag is made of a resin sheet. Therefore, the bag is light and extremely flexible, and the radiation shielding liquid is contained in the bag. When there is no bag, the bag can be easily made compact and handled, and the effect of easily handling the radiation shield alone can be obtained.

According to the fourth aspect of the present invention, a wide vertical surface can be easily formed by suspending and supporting a plurality of radiation shields from a frame via a connecting member while taking advantage of the ease of handling of the radiation shield alone. The effect that can be provided as a radiation shielding surface is obtained.

According to the fifth aspect of the present invention, in addition to the effect of the fourth aspect of the present invention, an effect that the radiation shielding surface can be expanded vertically and horizontally is obtained.

According to the sixth aspect of the present invention, in addition to the effect of the fifth aspect of the present invention, the vertical gap between each of the radiation shields in the vertical direction and the portion of the radiation shield in a liquid-tight manner are provided. The effect that the metal frame wraps in the horizontal direction and the metal frame blocks the radiation arriving at the gaps and portions and the shielding ability of the radiation shield can be improved is obtained.

According to the invention of claim 7, in addition to the effect of the invention of claim 6 , since each radiation shield unit arranged vertically is independently supported by the frame independently, The weight of the lower radiation shield alone is not added to the radiation shield itself, and the bag body is made of a thin material lightly to improve the handleability, and to prevent the radiation shield alone from being damaged The effect that the radiation shielding surface in the vertical direction can be enlarged while obtaining the effect is obtained.

According to the eighth aspect of the present invention, in addition to the effect of the seventh aspect of the present invention, the generation of a gap which is likely to occur between the individual radiation shields is prevented, thereby generating a spot-like radiation leakage location. Can be prevented, and a decrease in the radiation shielding function can be suppressed. According to the ninth aspect of the invention, in addition to the effect of the fourth aspect of the present invention, it is possible to prevent the generation of a gap between the adjacent radiation shielding bodies alone, so that a reduction in the radiation shielding function can be suppressed. Can be

According to the tenth aspect, in addition to the effect of the fourth aspect , the lower radiation shield alone is suspended from the upper radiation shield to support each radiation shield in the vertical direction. Even if the frame of the frame does not exist at the boundary between the single radiation shields, an effect that the radiation shielding area in the vertical direction can be enlarged by the plurality of radiation shields alone can be obtained.

According to the eleventh aspect, from the fourth aspect,
In addition to the effect of the invention according to any one of claims 10 to 10 , the frame can be moved by wheels, so that the radiation shield suspended from the frame is moved to the radiation shielding position, installed, and removed from the radiation shielding position. The effect that can be easily performed is obtained.

According to the twelfth aspect of the invention, in addition to the effect of the fourth aspect, even if the frame is fixed, the radiation shield is moved to the radiation shielding position, installed or removed from the radiation shielding position. Can be easily performed, and the operator can quickly and easily access the work position after passing through the radiation shielding position.

According to the thirteenth aspect of the present invention, the radiation shielding liquid which is widely distributed is divided into a plurality of bags, and the desired thickness of the radiation shielding liquid layer can be maintained on a vertical plane. It is easy by the reinforcement with the reinforcing wall, and the individual bags are separated from each other, so that each bag can be handled individually, and a vertical and wide radiation shielding surface can be easily secured. The shielding plate shields the radiation that passes through the space between the upper and lower bags, and contributes to reliable radiation shielding. Therefore, the radiation shielding effect of a vertical wide surface can be easily and reliably provided.

According to the fourteenth aspect of the present invention, in addition to the effect of the thirteenth aspect , the radiation shielding plate has a vertical width that wraps a lower horizontal frame with a space between the upper and lower bags. Therefore, it is not necessary to configure a frame by adding a dedicated radiation shielding plate to the frame, and the configuration of the frame can be made light and simple.

According to the fifteenth aspect, in addition to the effect of the fourteenth aspect , the frame is moved by the wheels.
The effect that the movement of the radiation shield becomes easy is obtained.

According to the sixteenth aspect, from the fourth aspect,
In addition to the effect of the invention according to any one of claims 15 to 15 , the bag body is flat and can secure a wide radiation shielding area.
Since the bag is made of a resinous sheet, the bag can be easily compacted and handled when there is no radiation shielding liquid inside the bag. There is an effect that the radiation shield that can be secured can be easily handled.

[Brief description of the drawings]

FIG. 1 is a three-view drawing of a bag of a radiation shield according to an embodiment of the present invention. FIG. 1 (a) is a front view, FIG. 1 (b) is a right side view with a partial cross-sectional view, and FIG. FIG. 4 shows a bottom view by partial cross-section display.

FIG. 2 is a sectional view taken along the line AA of FIG. 1 when a reinforcing wall is built in the bag of FIG.

FIG. 3 is an elevational view showing a suspended support state of the bag of FIG. 1;

FIG. 4 is an elevational view showing the bag of FIG. 1 in a double suspended support state;

FIGS. 5A and 5B are diagrams showing a case where another connecting member is employed in the bag of FIG. 1, wherein FIG. 5A is a front view of the bag, and FIG. 5B is a left side view of the bag. .

FIG. 6 is an elevational view showing a state in which the bag of FIG.

FIG. 7 is a side view of the slider shown in FIG. 6;

FIG. 8 is a perspective view showing a suspended support state of the bag of FIG. 6;

FIG. 9 is a perspective view of a frame capable of suspending and supporting a plurality of bags in FIG. 1 vertically and horizontally.

FIG. 10 is a sectional view illustrating an embodiment of a reinforcing wall provided in the bag of FIG. 1;

FIG. 11 is a cross-sectional view illustrating another embodiment of the reinforcing wall provided in the bag of FIG. 1;

FIG. 12 is a sectional view showing still another embodiment of the reinforcing wall provided in the bag of FIG. 1;

FIG. 13 is a sectional view showing still another embodiment of the reinforcing wall provided in the bag of FIG. 1;

FIG. 14 is a perspective view of the bag incorporating the reinforcing wall of FIG. 10 in a partially sectional view.

FIG. 15 is a perspective view of the bag when the position of the water supply / drain port of the bag of FIG. 1 is changed.

FIG. 16 is a front view showing a connected state of adjacent bags according to an embodiment of the present invention.

FIG. 17 is a right side view of FIG.

18 is an exploded view of the connecting means shown in FIG.

19 (a) is a front view, FIG. 19 (b) is a right side view with a partial sectional view, and FIG. 19 (c) is a three-view drawing of a radiation shielding bag according to another embodiment of the present invention. The figure shows a bottom view in partial cross section.

20 is a drawing showing a state in which the bag of FIG. 19 is mounted on a frame.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bag, 2 ... Metal plate, 3 ... Eyelet fitting, 4 ... Water supply / drainage port, 5 ... Reinforcement wall, 6 ... Flow hole, 7 ... Frame, 8 ... Connector, 9 ... Intermediate connector, 10 ... Connector, 11 ... hanging brackets, 12 ... openings, 13 ... trolleys, 14, 16, 40 ...
Wheels, 15: horizontal projection, 17, 43, 44, 45: horizontal frame, 18: support column, 19: bogie frame, 20: hook, 30: bolt, 32: wing nut.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Mizuochi 3-2-2, Sachimachi, Hitachi, Ibaraki Pref. Hitachi Engineering Services Co., Ltd. (72) Inventor Tetsu Omori 3-2-2, Sachimachi, Hitachi, Ibaraki No. Hitachi Engineering Services Co., Ltd. (56) References JP-A-53-34091 (JP, A) JP-A-55-17415 (JP, A) JP-A-58-158596 (JP, A) 12398 (JP, A) JP-A 61-147998 (JP, U) JP-A 57-160697 (JP, U) JP-B 49-38800 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) G21F 3/00

Claims (16)

(57) [Claims] 1. A bag, a reinforcing wall connecting between opposing inner wall surfaces of the bag, a supply / discharge port for radiation shielding liquid provided on the bag, and an end of the bag. And a hole for engaging a connecting means used when suspending and supporting the bag body , wherein the hole is at least an upper end of the bag body.
Parts of the bag body facing each other
Liquid-tight, and equipped with the liquid-tight part
A radiation shield unit characterized by the fact that 2. A part according to claim 1, wherein a hole is provided.
Is to hold the opposing surfaces of the bag with a metal plate
A radiation shield unit characterized by being a liquid-tight part that is superimposed . 3. The bag according to claim 1, wherein the bag is a tree.
A single radiation shield composed of a flat sheet made of a fat sheet . 4. A plurality of single radiation shields according to claim 1
From the structure, engaged with the hole equipped on the radiation shield alone
A radiation shield unit is suspended from the frame by suspending and supporting it via a connector.
A radiation shield equipped with a body. 5. The method according to claim 4, wherein the vertical direction and the horizontal direction are different from each other.
A radiation shield that is equipped with multiple radiation shields on the frame . 6. A frame according to claim 5, wherein the frame is vertically movable.
Liquid-tight radiation with vertical gaps in the radiation shield alone
Gold wrapped horizontally with the wire shield alone
A radiation shield equipped with a metal frame . 7. The device according to claim 6, wherein the first and second components are arranged vertically.
Each radiation shield alone is suspended from the frame independently of each other
Radiation shield that is. 8. The radiation shielding body according to claim 7,
Equipped with a hole in the liquid-tight part located at the lower end
A radiation shield having a hole at the lower end thereof connected to a frame . 9. The radiation shield according to claim 4,
Equipped with a hole in the liquid-tight part located at the lower end
The radiation shields that are horizontally adjacent to each other
A radiation shield connected by a connecting means passing through a hole at the lower end . 10. The method according to claim 4, wherein the adjacent pixels are vertically arranged.
Lower end of the radiation shield alone above each radiation shield
Equipped with holes in the liquid-tight parts located in
Radiation shields alone are vertically adjacent to each other.
A radiation shield connected in series to a hole in the body through a connector. 11. The method according to claim 4, wherein :
In one aspect, the frame is movably supported by wheels.
And that the radiation shield. 12. The structure according to claim 4, wherein the connecting member is provided on the frame.
A radiation shield movably mounted along the frame . 13. At least two steps, up and down, on an upright supporting column.
A frame with an installed horizontal frame, each said horizontal
Connection means mounted on the frame with horizontal spacing
And are supported by the connecting means in a detachable manner.
Reinforced by a reinforcing wall that connects the opposing inner walls
A plurality of bags containing a radiation shielding liquid, and the bag is equipped with the bags.
A supply and discharge port for the radiation shielding liquid,
And the gap between the upper and lower bags
And a metal radiation shielding plate
For example was the radiation shield. 14. The horizontal frame of claim 13, wherein :
The arm is made of metal, and the radiation shielding plate is
Wrap the frame between the bags arranged up and down
Radiation shield that is configured to widen until the bottom width over to. 15. The frame according to claim 14, wherein the frame is provided by wheels.
A radiation shield that is movably supported . 16. The method according to claim 4, wherein :
The radiation shield according to one of the preceding claims, wherein the bag body is a flat sheet made of a resin sheet .