JP6117064B2 - Radiation shield construction apparatus, radiation shield construction method using the same, and radiation shield construction robot - Google Patents

Description

The present invention relates to a method and construction of the construction apparatus and a radiation shield according to which the radiation shield, and to construction robots radiation shield.

  For example, when working in a room with a high radiation dose, it is preferable to cover a member (shielded body) that emits radiation with a shield. Thereby, the radiation dose irradiated to a worker can be reduced.

  There exists patent document 1 in connection with such a shielding technique. In Patent Document 1, a step of installing a hollow container at a predetermined portion of a shielded body, a step of sending a fluid into the container through a hose by a fluid delivery unit, and a shielding material supply unit A radiation shielding method including a step of supplying a granular shielding material to a fluid and transporting and filling the shielding material into a container via a hose is described.

JP 2010-156615 A

  In the technique described in Patent Document 1, a shielded object is shielded by arranging a hollow container filled with a granular shielding material together with a fluid so as to surround the shielded object. Therefore, it may be difficult to arrange the hollow container depending on the size, shape, position, etc. of the shielded body. That is, in the technique described in Patent Document 1, there is a limit to a shielded body that can be shielded.

The present invention has been made in view of the above problems, an object of the present invention is to provide, construction possible radiation shield to shield the radiation relative to the hidden member such as a variety of shapes and structures mETHOD construction of construction apparatus and a radiation shield according to which, and to provide a construction robot radiation shield.

The present inventors have intensively studied to solve the above problems. As a result, it has been found that the above problem can be solved by the following. That is, the gist of the present invention is that a rubber having fluidity can be sprayed on an object to be shielded from radiation , the rubber spraying nozzle being replaceable, and the rubber spraying nozzle connected to the rubber spraying nozzle. A rubber spraying device capable of spraying the rubber by changing the pressure or the pumping speed to the shielded body through, and provided as a nozzle different from the rubber spraying nozzle, for the rubber sprayed from the rubber spraying nozzle A shielding material spray nozzle that is granular and capable of spraying a shielding material that shields radiation, and is connected to the shielding material spray nozzle and changes the pressure or pumping speed to the shielded body through the shielding material spray nozzle. a shielding material spraying apparatus capable blown timber, a nozzle spraying the rubber spraying nozzle and the shielding member As well as lifting, characterized in that it comprises a counter capable of supporting member of the nozzle spraying the rubber spraying nozzle and the shielding material to the object to be shield relates construction device of the radiation shield. The other means for solving will be described later in the mode for carrying out the invention.

According to the present invention, construction of a variety of shapes and methods Construction of the radiation shield by construction unit and its construction possible radiation shield to shield the radiation relative to the object to be shield structure, etc., as well as the radiation shield Robots can be provided.

It is a figure which shows the room | chamber interior of the reactor building where the construction method of the shield of this embodiment is implemented. It is a flowchart explaining the construction method of the shield of this embodiment. It is a figure explaining the construction method of the shielding body of this embodiment, (a) is a state at the time of spraying the first rubber, (b) is a state at the time of spraying the first shielding material, (c) is two (D) is a figure which shows the mode at the time of spraying the rubber | gum of the 2nd time, and the mode at the time of spraying the shielding material of the 2nd time. It is sectional drawing of the shield constructed by the construction method of this embodiment. It is sectional drawing of another shielding body constructed | assembled by the construction method of this embodiment.

  Hereinafter, a form for carrying out the present invention (this embodiment) will be described with reference to the drawings as appropriate.

  First, shields constructed (formed) by the shield construction method of the present embodiment include neutrons, sunlight (ultraviolet rays, infrared rays, far infrared rays, etc.), etc., in addition to radiation (α rays, β rays, and γ rays). Depending on the type of the shielding material, any object can be shielded. Especially, in this embodiment, it is preferable that radiation is shielded. Therefore, as an example, the following embodiment will be described on the assumption that the shield shields radiation.

  Moreover, as a construction site of the shielding body that shields radiation, that is, a member on which the construction method of the shielding body of the present embodiment is performed, for example, a structure of a nuclear facility is cited. Therefore, in the following explanation, the present embodiment will be described by taking as an example a case where a shield is applied to a structure in a nuclear reactor building (a structure of a nuclear facility) as a structure of a nuclear facility. explain.

  Drawing 1 is a figure showing room 1 of a reactor building where the construction method of shield 10 of this embodiment is carried out. In this embodiment, an unexpected accident occurs in a nuclear facility (not shown), and a radioactive substance adheres to the piping 2 (shielded body, structure of the nuclear facility) in the room 1, so that the radiation dose in the room 1 is high, It is assumed that no member can enter. And FIG. 1 has shown a mode that the shielding body 10 which shields the radiation emitted from the said radioactive substance with the construction robot 100 with which the construction apparatus 200 is equipped is constructed.

  The construction device 200 includes a construction robot 100, a rubber spraying device 102, and a shielding material spraying device 104. The construction robot 100 approaches the pipe 2 and constructs the shield 10. The rubber spraying device 102 is a power source for supplying rubber sprayed from the construction robot 100 to the construction robot 100 and spraying the rubber. Further, the shielding material spraying device 104 supplies the shielding material sprayed from the construction robot 100 to the construction robot 100 and serves as a power source for spraying the shielding material.

  The construction robot 100 includes a rubber spray nozzle 101 that can spray rubber onto the pipe 2. The rubber spray nozzle 101 is connected to the rubber spray device 102 by a long hose. As a result, the construction robot 100 approaches the pipe 2 in a state where the rubber spraying device 102 is sufficiently separated from the pipe 2.

  The rubber spray nozzle 101 is replaceable. That is, when the construction of the shield 10 is completed and the construction robot 100 is stored, the tip of the rubber spray nozzle 101 having a narrow flow path may be clogged. Therefore, in order to eliminate such a state, the rubber spray nozzle 101 is configured to be replaceable. As such a nozzle, for example, a resin-made disposable nozzle can be used as the rubber spray nozzle 101.

  The construction robot 100 includes a shielding material spray nozzle 103 that is provided as a nozzle different from the rubber spray nozzle 101 and that can spray a shielding material against the rubber sprayed from the rubber spray nozzle 101. The shielding material spraying nozzle 103 is also connected to the shielding material spraying device 104 by a long hose similarly to the rubber spraying nozzle 101. As a result, the construction robot 100 approaches the pipe 2 in a state where the shielding material spraying device 104 is sufficiently separated from the pipe 2.

  The shielding material spray nozzle 103 is made of a material having high strength. Thereby, even when a shielding material having high hardness such as tungsten or iron is discharged from the shielding material spray nozzle 103, the durability of the shielding material spray nozzle 103 can be maintained and improved.

  The rubber spray nozzle 101 and the shielding material spray nozzle 103 in the construction robot 100 are rotatably supported by an extendable arm 105. Thereby, rubber | gum and a shielding material are sprayed to arbitrary positions with respect to the piping 2. As shown in FIG.

  The construction robot 100 constructs the shield 10 by spraying a fluid rubber and a granular shielding material alternately on the pipe 2. Here, in this embodiment, rubber is used as an adhesive for bonding and fixing the shielding material to the pipe 2. In this embodiment, the shielding material shields radiation and is a metal material that shields radiation such as tungsten and iron. In the present embodiment, the shielding material includes shielding materials having different particle sizes.

  The rubber spraying device 102 mixes the liquid rubber and the curing agent after mixing the liquid rubber container 102a as a raw material of the rubber to be sprayed, the curing agent container 102b for curing the liquid rubber on the surface of the pipe 2, and the liquid rubber and the curing agent. And a pressurizing manifold 102 c that presses and sprays the pipe 2 through the rubber spray nozzle 101. Furthermore, the rubber spraying device 102 includes a pressure feeding device 102d that pressure-feeds the liquid rubber in the container 102a to the pressure manifold 102c, and a pressure feeding device 102e that pressure-feeds the curing agent in the container 102b to the pressure manifold 102c. By changing the conditions (pressure, pumping speed, mixing ratio, etc.) of the pressurizing manifold 102c and the pumping apparatuses 102d and 102e, the amount of rubber to be sprayed and the curing conditions can be changed as appropriate. In the present embodiment, after spraying, the rubber is substantially cured in about 1 hour at room temperature.

  The shielding material spraying device 104 includes a shielding material tank 104 a that stores the shielding material, and a pressure feeding device 104 b that sprays the shielding material onto the pipe 2 through the shielding material spraying nozzle 103. By changing the conditions (pressure, pumping speed, etc.) of the pressure feeding device 104b, the amount of the shielding material sprayed on the surface of the pipe 2 can be appropriately changed.

  Although not shown, the construction robot 100 includes a device that uses laser light or the like to measure the distance between the construction robot 100 and the pipe 2 and grasps the arrangement of each structure in the room 1. It has been. Further, although not shown, a camera capable of confirming the sprayed state on the pipe 2 is also provided. Further, although not shown, the construction robot 100 is provided with a radiation dose measuring device for measuring the radiation dose in the room 1. Although details will be described later, the spraying of the rubber and the shielding material is controlled based on the values measured by these devices.

  The construction robot 100 is driven by an arithmetic control unit (not shown) based on an operator's instruction operation. The arithmetic control unit includes, for example, a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), a hard disk drive (HDD), and the like, and a predetermined program developed in the ROM is executed by the CPU. Is realized.

  Next, a construction method of the shield 10 will be described with reference to FIG.

  FIG. 2 is a flowchart for explaining a construction method of the shield 10 according to the present embodiment. In the arithmetic control unit (not shown), the relationship of the reduction rate of the radiation dose with respect to the thickness of the shield 10 is stored as a database and stored in advance. Specifically, the relationship that the rate of decrease in radiation dose increases as the shield 10 becomes thicker is stored in a database. This relationship can be determined in advance through experiments or the like.

  First, the arithmetic control unit measures the radiation dose in the room 1 with a radiation dose measuring device (not shown) (step S101). Then, the arithmetic control unit determines a reduction rate of the radiation dose necessary for reducing the measured radiation dose to a reference value at which the worker can work. Then, the arithmetic control unit reads and determines the thickness of the shield 10 corresponding to the determined decrease rate from a previously stored database (step S102). Then, while confirming the spraying state using a confirmation camera, rubber and shielding material are alternately applied to the entire pipe 2 shown in FIG. 1 until the thickness of the shielding body 10 reaches the determined thickness. Apply (step S103). Here, a state when the rubber and the shielding material are alternately applied will be described with reference to FIG.

  FIG. 3 is a diagram for explaining a construction method of the shield 10 according to the present embodiment, where (a) shows a state when the first rubber is sprayed, (b) shows a state when the first shielding material is sprayed, (C) is a state at the time of second rubber spraying, (d) is a diagram showing a state at the time of the second spraying of the shielding material. In FIG. 3, rubber is indicated by reference numeral 10a, and the shielding material is indicated by reference numeral 10b.

  First, as shown in FIG. 3A, rubber is sprayed from the rubber spray nozzle 101 to the pipe 2. Then, the arithmetic control unit moves the rubber spray nozzle 101 so that the entire pipe 2 is covered with rubber by expanding and contracting the arm 105. The same applies to the subsequent steps. Thereby, the whole piping 2 is covered with rubber, and a rubber layer is formed.

  Then, after the entire pipe 2 is covered with the rubber, before the rubber is cured (preferably immediately after the rubber is sprayed), as shown in FIG. The material is sprayed on the surface of the pipe 2 covered with rubber. At this time, since the rubber having fluidity has elasticity and adhesiveness, even if the shielding material is sprayed on the pipe 2 covered with rubber, the sprayed shielding material does not rebound by the pipe 2 and is fluid. It adheres to rubber having. More specifically, since the shielding material contacts the rubber layer at a certain speed, the sprayed shielding material is buried in the rubber layer. Since the shielding material continues to be sprayed thereafter, the sprayed shielding material is deposited near the surface of the rubber layer using rubber as an adhesive. In this way, a layer of shielding material is formed. Since the rubber is gradually cured while the shielding material is sprayed, the attached shielding material is fixed to the surface of the pipe 2 by the cured rubber.

  After the rubber is cured and the shielding material is fixed to the pipe 2, the rubber is again sprayed onto the surface of the pipe 2 by the rubber spray nozzle 101 as shown in FIG. At this time, since the shielding material is fixed to the pipe 2 by the hardened rubber, the rubber is sprayed from the outside of the fixed shielding material. And a rubber layer is newly formed so that the shielding material fixed to the piping 2 may be covered by newly spraying rubber.

  Then, as shown in FIG. 3D, the shielding material is sprayed again by the shielding material spray nozzle 103 against the newly formed rubber layer. Thereby, in the same manner as described with reference to FIG. 3B, the shielding material is fixed to the surface of the pipe 2, and a shielding material layer is formed. Then, the shield 10 is constructed by repeating the process of FIG. 3, that is, the rubber spraying process and the shielding material spraying process. Here, the construction of the shield 10 thus constructed will be described with reference to FIG.

  FIG. 4 is a cross-sectional view of the shield 10 constructed by the construction method of the present embodiment. As in FIG. 3, the rubber is indicated by reference numeral 10a, and the shielding material is indicated by reference numeral 10b. For simplification of illustration, two layers of the rubber 10a layer and the shielding material 10b are shown. Furthermore, FIG. 4 is a schematic diagram and may differ from an actual layer configuration.

  In FIG. 4, the layer of rubber 10a formed on the surface of the pipe 2 is formed in the process shown in FIG. The layer of the shielding material 10b formed on the outer surface of the rubber 10a layer is formed in the step shown in FIG. Although not shown in FIG. 4, the shielding members 10b are bonded and fixed by rubber 10a. Moreover, as shown in FIG. 4, the particle size of the shielding material 10b is different. Therefore, the shielding material 10b is densely fixed so that the gap (not shown in FIG. 4) between the particles of the adjacent shielding material 10b is as small as possible, and the shielding effect is enhanced.

  And the layer of the shielding material 10b is formed in the outer side of the layer of this shielding material 10b through the layer of the rubber 10a. At this time, a sufficiently thick rubber 10a layer is formed between the two shielding material 10b layers. Therefore, the shielding material 10b can be firmly laminated over a plurality of layers, the peeling of the shielding body 10 can be suppressed, and the durability can be improved.

  Thus, according to this embodiment, the shield 10 capable of shielding radiation and the like can be applied to the shielded objects having various shapes and structures. That is, as shown in FIG. 1, the rubber and the shielding material can be sprayed remotely at a desired position such as the pipe 2 by using the movable rubber spraying nozzle 101 and the shielding material spraying nozzle 103. Therefore, there is no need to install a jig for spraying on the shielded body, and there is no restriction on the shape and structure of the shielded object to be constructed, the construction location, and the like. This is advantageous when the jig is particularly difficult to install, for example, when a shield is installed on the ceiling. Thereby, what kind of to-be-shielded body can construct the shielding body 10 favorably.

  In addition, the area and density of the shield 10 can be easily changed simply by changing the position of the nozzle. Specifically, if it is sprayed from a far place with respect to the shielded body, it is possible to construct the shield body 10 having a wider area at a time, and if it is sprayed from a closer place, a higher density shielding is possible. The body 10 can be constructed at once. Therefore, the shield 10 can be easily constructed according to the area of the shield and the radiation dose.

  Furthermore, it is easy to make the rubber layer thicker by using rubber. Therefore, if the rubber is sufficiently sprayed after the shielding material is sprayed, the sprayed shielding material is completely covered with a rubber layer having a sufficient thickness. Therefore, a shielding material can be newly sprayed and fixed to the whole of this part, and the quantity of the shielding material to fix can be made sufficient. Thereby, the shielding effect can be improved.

  In addition, since the rubber is first sprayed and then the shielding material is sprayed, the shielding material is sprayed against the elastic rubber. Therefore, the kinetic energy of the shielding material is absorbed by the rubber when it collides with the rubber, and the shielding material can be prevented from bouncing off from the shielded body. Thereby, a shielding material can be efficiently fixed to rubber. In particular, as described above, by using rubber, the thickness of the rubber layer can be easily increased, so that the elasticity can be increased, and this advantage can be sufficiently exhibited.

  Furthermore, since the rubber and the shielding material are sprayed separately, the sprayed shielding material is unlikely to sag. That is, if the rubber and the shielding material are mixed, the specific gravity of the mixture is heavier than that of the rubber. Therefore, when the mixture is sprayed, the shielding material tends to sag, and the thickness of the shield 10 to be constructed is uneven. May occur. However, in this embodiment, since the rubber and the shielding material are sprayed separately, the shielding material 10 is less likely to sag and the shielding material density is less uneven.

  In addition, rubber is a light material having fluidity, and the shielding material is a granular material, so that there is an advantage that it can be easily blown from the nozzle. That is, if a mixture of rubber and shielding material is to be sprayed, the mixture becomes difficult to fly due to the interaction between the fluidity of the rubber and the heavy metal material, making spraying difficult to control and spraying to the desired location. It may not be possible. However, since these are sprayed separately as in the present embodiment, it is easy to control the behavior when spraying these, and it is possible to spray easily to a desired location. Further, even after spraying, the shield 10 having a multilayer structure of rubber and shielding material is used instead of the shielding member in which the shielding material is dispersed in the rubber.

  Furthermore, since the rubber and the shielding material are sprayed separately, the number of layers of the shielding material can be arbitrarily changed according to, for example, the radiation dose from the shielded body. Specifically, for example, when the radiation dose is high, the shield 10 may include the shielding material layer and the rubber layer fixing the shielding material. When the radiation dose is not so high, What is necessary is just to set it as the shield 10 which does not contain. As described above, since the shield 10 according to the present embodiment is difficult to peel off, it is possible to construct the shield 10 that is difficult to peel off and can be shielded satisfactorily even when the shielding material layer has multiple layers.

  Moreover, the shielding material to spray is comprised including the shielding material from which a particle size differs. Therefore, the clearance gap between shielding materials when a shielding material is sprayed can be reduced, and it can be set as the shielding body 10 which has a more favorable shielding effect. Moreover, the unevenness | corrugation can be provided in the surface by fixing the shielding material from which a particle size differs to rubber | gum. When new rubber is sprayed on the uneven surface, the unevenness can improve the adhesive strength between the rubber and the shielding material. Thereby, the shield 10 which is more difficult to peel can be applied.

  Although the present embodiment has been described above, the following embodiment can be used in addition to the above-described embodiment. That is, in the above-described embodiment, as shown in FIG. 4, the same type of shielding material (with different particle sizes) is used, but a plurality of types of shielding material can also be used. Such a configuration is particularly effective when, for example, it is desired to shield both radiation (for example, gamma rays) and neutrons.

  FIG. 5 is a cross-sectional view of another shield constructed by the construction method of the present embodiment. The rubber 10a and the shielding material 10b are provided on the surface of the pipe 2 one by one, and the rubber 10a layer is further provided outside the shielding material 10b, as in the embodiment shown in FIG. However, in the form shown in FIG. 5, the layer of the shielding material 10c different from the shielding material 10b is provided.

  The shielding material 10b is tungsten or the like that shields γ rays, and the shielding material 10c is boron or nylon particles that absorb neutrons. Thus, by laminating a plurality of different types of shielding materials (shielding materials 10b and 10c) with the rubber 10a, there is an advantage that different types of shielding materials can be shielded in addition to the above effects.

  As yet another embodiment, in the above-described embodiment, rubber is first sprayed onto the pipe 2. However, for the purpose of improving the surface of the pipe 2, a shielding material made of a metal material can be sprayed first. . That is, the shielding material spray nozzle 103 sprays the shielding material against the sprayed rubber as described above, but the metal material constituting the shielding material is directly applied from the shielding material spray nozzle 103 to the surface of the pipe 2. Shot peening can be performed by colliding at high speed. Thereby, the improvement of durability of the piping 2 and the improvement of joining strength with the shield 10 by the unevenness | corrugation on the surface of the piping 2 can be aimed at.

  In addition, the present invention can be implemented by arbitrarily changing the above embodiment within a range not changing the gist of the present invention.

  For example, although radiation and neutrons are shielded in the above-described embodiment, for example, a shielding material that shields sunlight may be used. Specifically, for example, ultraviolet rays can be shielded by the shield 10 by using an ultraviolet absorber as the shielding material. Thereby, the weather resistance of a to-be-shielded body can be improved.

  Further, for example, in the above-described embodiment, the pipe 2 (see FIG. 1) as a structure of the nuclear facility is taken as an example of the shielded body, but the shielded body is not limited to this. Accordingly, the shielded object on which the shield 10 is constructed may be a structure of a nuclear facility and may be any structure other than the pipe 2, or may be a structure other than a structure of a nuclear reactor facility. Good. Specifically, for example, the outer wall of a house is used as a shielded body, and the shielding body 10 is provided on the outer wall, thereby shielding radiation, neutrons, ultraviolet rays, and the like from the outside, and suppressing these intrusions into the room. it can.

2 Piping (shielded body)
100 Construction robot (construction equipment)
101 Rubber spray nozzle 102 Rubber spray device (construction device)
103 Shielding material spray nozzle 104 Shielding material spraying device (construction device)
105 Arm (support member)
200 Construction Device 10 Shielding Body 10a Rubber 10b Shielding Material 10c Shielding Material

Claims (4)

A rubber spray nozzle that is capable of spraying fluid rubber against a shielded body shielded from radiation and is replaceable;
A rubber spraying device connected to the rubber spraying nozzle and capable of spraying the rubber by changing a pressure or a pumping speed to the shielded body through the rubber spraying nozzle;
A shielding material spray nozzle that is provided as a separate nozzle from the rubber spray nozzle and is capable of spraying a shielding material that is granular and shields radiation against the rubber sprayed from the rubber spray nozzle;
A shielding material spraying device connected to the shielding material spraying nozzle and capable of spraying the shielding material by changing a pressure or a pumping speed to the shielded body through the shielding material spraying nozzle;
A radiation shielding body construction comprising: a support member that supports the rubber spray nozzle and the shielding material spray nozzle and is capable of opposing the rubber spray nozzle and the shielding material spray nozzle to the shielded body. apparatus. A method of constructing the radiation shield by the construction unit of the radiation shield of claim 1,
A rubber spraying step of spraying the fluid rubber on the shielded body by the rubber spraying device;
The rubber which is blown above the object shield in the rubber spraying step, the pre Kisaegi蔽材, characterized in that it comprises a step spray shielding material sprayed by the shielding material spraying device, application of radiation shield Method.   In the rubber spraying step, the rubber has adhesiveness and fluidity in an uncured state and is cured after a predetermined time, and the uncured rubber is sprayed on the shielded body,
  In the shielding material spraying step, the uncured rubber sprayed in the rubber spraying step is sprayed so that the shielding material is attached or embedded,
  The method of constructing a radiation shield according to claim 2, wherein a layer of the shielding material is formed. A rubber spray nozzle that is capable of spraying fluid rubber against a shielded body shielded from radiation and is replaceable;
A shielding material spray nozzle that is provided as a separate nozzle from the rubber spray nozzle and is capable of spraying a shielding material that is granular and shields radiation against the rubber sprayed from the rubber spray nozzle;
An elastic support member capable of supporting the rubber spray nozzle and the shielding material spray nozzle and capable of facing the rubber spray nozzle and the shielding material spray nozzle to the shielded body ;
A measuring device for measuring a distance between the shielded body,
A radiation shielding object construction robot , comprising: a camera capable of confirming a sprayed state of the shielding object.

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