JP2008111688A - Apparatus for inspecting radioactive contamination of temporary scaffold for work - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To execute radiation inspection when temporary scaffolds for work are transferred to the outside with a fewer number of people without having to occupy a large area. <P>SOLUTION: An apparatus for inspecting radioactive contamination of temporary scaffolds for work comprises both a radiation detection device (12) provided with a radiation detector for detecting radioactive contamination of temporary scaffolding members (2) and a conveyor (22) for transferring mounted temporary scaffolding members in such a way that the radiation detection device may scan. The conveyor transfers the temporary scaffolding members forward, and the radiation detection device scans the temporary scaffolding members from one direction or more. When the temporary scaffolding members are approximately cylindrical scaffolding pipes (2a), the radiation detection device scans the scaffolding pipes from one direction, and the conveyor transfers the scaffolding pipes while axially rotating them. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a radioactive contamination inspection apparatus, and in particular, a radioactive contamination inspection of a temporary work scaffold suitable for inspecting radioactive contamination to a temporary scaffold material (measurement object) carried out from a nuclear facility management area. Relates to the device.

  All items used in the nuclear facility management area have been confirmed to be free from radioactive contamination before being transported outside the nuclear facility management area, and the safety is ensured. It has been broken.

As a radioactive contamination inspection apparatus for that purpose, for example, as in the “article carry-out monitor” described in Patent Document 1, the space, weight and drive unit power capacity of the radiation measurement apparatus are reduced, and the processing efficiency of radiation measurement is improved. A radiation measuring apparatus is disclosed.
JP 2005-83978 A

  Nuclear facilities often have temporary working scaffolds that are combined with scaffolding pipes, scaffolding treads, etc., for inspection and maintenance of equipment in high places. The temporary working scaffold used in the nuclear facility management area will be dismantled after use and all temporary scaffold materials will be confirmed to be free of radioactive contamination before being carried out.

  Until now, inspections to confirm that there is no radioactive contamination in the temporary work scaffolds have been made so that temporary scaffolding materials (inspection objects) such as scaffolding pipes, scaffolding treads and clamps of various lengths do not overlap. Spread it all over and scan it from the upper side (front side) with a handy type radiation detector (Geiger counter), then turn over all the inspection objects spread on the floor and scan the upper side (back side) again Was done by doing.

  Such work requires not only a large area because of the need to spread the temporary scaffolding material on the floor surface, but also occupies the vicinity of the carry-out port, which may hinder other work. Also, the work of arranging temporary scaffolding materials on one side and turning the temporary scaffolding materials arranged on one side upside down was very hard work. Further, the operation of scanning the temporary scaffolding material spread over the entire floor using the radiation detection apparatus is often performed by a plurality of people. For this reason, there is a risk that some temporary scaffolding materials may be forgotten to be scanned.

  The present invention has been made to solve the above-mentioned problems, and its purpose is to perform radioactivity inspection when carrying out the temporary work scaffold used in the nuclear facility management area without occupying a large area. An object of the present invention is to provide a radioactive contamination inspection apparatus that can be easily implemented by a small number of people.

  In order to solve the above problem, the radioactive contamination inspection apparatus of the present invention includes a radiation detection apparatus (12) provided with a radiation detector for detecting radioactive contamination of the temporary scaffolding material (2) which is an inspection object; And a conveyor (22) for transporting the placed temporary scaffold material so as to be scanned by the radiation detection device, the conveyor transports the temporary scaffold material forward, and the temporary scaffold material is 1 by the radiation detection device. Scanning is performed from the above directions.

  Here, the temporary scaffold (2) is a substantially cylindrical scaffold pipe (2a), the radiation detection device (12) scans the scaffold pipe from one direction, and the conveyor (22) pivots the scaffold pipe. It is also preferable to carry it forward in the axial direction while rotating.

  The radiation detection device (12) has a structure in which a handy type radiation detector (14) is hung on a suspension base (16), and the temporary scaffolding material (2) is attached from above, from the side or from below. It is also preferable to scan.

  Here, it is assumed that the suspension base (16) has a flexible structure in which the direction and position of the handheld radiation detector (14) that is locked can be adjusted.

  Furthermore, it is preferable that the conveyor (22) is formed with a hook (24) at one end thereof so as to be hooked on the lift of the truck bed.

  According to the radioactive contamination inspection apparatus of the present invention, the temporary scaffolding material is placed on the conveyor, and in this state, the temporary scaffolding material is scanned by the radiation detection device to detect the radioactive contamination. Therefore, it is possible to perform the work even in a relatively narrow space. Moreover, not only can the work for spreading the temporary scaffolding material on the floor surface be saved, but also the inspection work can be performed by two persons: the person who puts the temporary scaffolding material on the conveyor and the person who lowers the temporary scaffolding material from the conveyor. It becomes like this. In addition, the temporary scaffolding material is placed on the conveyor and moved while being scanned for radioactive contamination, so the temporary scaffolding material before scanning is distributed upstream, and the temporary scaffolding material after scanning is distributed downstream, forgetting to scan The fear can be eliminated.

  If the temporary scaffolding is a substantially cylindrical scaffolding pipe, the entire circumference of the scaffolding pipe can be scanned by scanning from one direction by adopting a conveyor that transports the scaffolding pipe forward in the axial direction while rotating the scaffolding pipe. This makes it possible to reduce the required number of radiation detection devices, which are expensive equipment.

  The handy type radiation detector can be used by suspending the handy type radiation detector on the suspension base, reducing the cost for introducing the device. can do.

  If the suspension base has a flexible structure that can freely adjust the direction and position of the radiation detector, the direction and distance of the radiation detector to the temporary scaffold can be easily adjusted as necessary. You can adjust it.

  In addition, if a hook for hooking the temporary scaffolding material on one end of the truck is formed on one end of the conveyor, the inspection of radioactive contamination and the loading of the temporary scaffolding material can be performed simultaneously. Work can be made more efficient.

  The radioactive contamination inspection apparatus of the present invention is used in a nuclear facility management area of a nuclear power plant, in particular, temporary scaffolding materials such as scaffolding pipes and scaffolding treads used for inspection and maintenance of facilities in high places. This is to efficiently check the presence or absence of radioactive contamination in the water. Hereinafter, after explaining various temporary scaffolds constituting the temporary scaffold, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view for explaining various temporary scaffolding materials. Note that the scales of each figure are different.
Fig.1 (a) has shown horizontal support | pillar 2a '(scaffolding pipe 2a) used as the cross member of a temporary scaffold. The horizontal strut 2a 'has a structure in which a wedge portion 3 extending in one direction perpendicular to the pipe is formed at both ends of a pipe having an outer diameter of about 6 cm and a length of about 0.4 m or 1.8 m. is doing.
FIG. 1 (b) shows a vertical support 2a ″ (scaffolding pipe 2a) as a vertical member of a temporary scaffold. This vertical support 2a ″ has an outer diameter of about 6 cm and a length of 1.8 m or 3 It has a structure in which locking portions 4 for inserting one wedge portion 3 formed at both ends of the horizontal support 2a ′ are formed at a predetermined interval on the side surface of a pipe of about 6 m. Further, a support rod 5 extending in the radial direction is attached to the inside of the opening at both ends of the vertical support 2a ″.
FIG.1 (c) has shown the linear joint 2b for connecting and extending the scaffolding pipe 2a to an axial direction. The linear joint 2b is a hollow single tube having a length of 0.3 m and an outer diameter of about 5 cm, and L-shaped cutout portions 6 for holding the support rods at both ends of the vertical column are attached to both ends thereof. Is formed. The straight joint 2b is inserted into the end openings of the two vertical struts 2a ″, and one vertical strut 2a ″ is twisted by about 90 °, whereby the notch of the straight joint 2b is formed on the support rod 5 of the vertical strut 2a ″. 6 is locked and the two vertical struts are connected.
FIG. 1 (d) shows a scaffolding tread 2 c on which both ends are hooked and placed between two parallel horizontal struts 2 a ′ mounted horizontally between the vertical struts 2 a ″ standing in parallel. This scaffold tread 2c has a structure in which an outer frame is formed on a mesh material having a length of about 0.4 m and a width of about 1.8 m, and a U-shaped hook 7 is formed on the short side thereof.
Although the drawings are omitted, the temporary scaffolding material includes various members other than those described above, such as corner brackets and braces for reinforcing the combined vertical struts and horizontal struts, a fixed jack base in contact with the ground, and various handrails. .

  2 and 3 are perspective views showing an embodiment of the radioactive contamination inspection apparatus of the present invention, and FIG. 2 is a side view (FIG. 2 (a)) of a suspension base constituting the radioactive contamination inspection apparatus. A plan view (FIG. 2B) and FIG. 3 are a plan view (FIG. 3A) and a side view (FIG. 3B) of a conveyor constituting the radioactive contamination inspection apparatus.

  This radioactive contamination inspection apparatus includes a radiation detection apparatus 12 provided with a radiation detector for detecting radioactive contamination of a temporary scaffold material that is an inspection object, and the mounted temporary scaffold material by the radiation detection apparatus 12. It is comprised from the conveyor 22 conveyed so that it may scan.

  The radiation detector 12 has a structure in which a hand-held type radiation detector 14 that sounds a warning sound from a built-in speaker is hung on a stand-like suspension base 16 when a radioactivity exceeding a predetermined specified value is detected. is doing.

  This suspension base 16 is composed of a leg portion 16a having a sufficient weight in contact with the ground and a light articulated arm portion 16b, and adjusts the orientation and position of the handy type radiation detector 14 held on the tip of the arm portion. It has a flexible structure. Thereby, the radiation detector 14 attached to the suspension stand 16 can be moved in a free direction within a range of about 1 to 2 m in height.

The conveyor 22 as a whole has a width of about 0.9 m and a length of about 8 m, and automatically conveys the temporary scaffolding material 2 placed thereon.
More specifically, the conveyor 22 includes an outer frame 22a that forms a skeleton of the conveyor, and a plurality of tires 27 that are attached to a plurality of axles 25 that are arranged in parallel at equal intervals while being inclined with respect to the longitudinal direction of the conveyor. , And a rotating means 29 for rotating the axle 25 to which the tire 27 is attached. The outer frame 22a is formed with wall portions 31 standing on both sides of the longitudinal side so that the temporary scaffolding material 2 placed does not slip off the conveyor 22. Legs 33 are formed at the lower four corners of the outer frame 22a, and hooks 24 are formed at one end of the outer frame 22a to be hung on the side of the truck bed as shown in FIG. Has been.
The plurality of tires 27 attached to the axle 25 are, for example, rubber tires having a diameter of about 15 cm and a width of about 3 cm, and a relatively small temporary scaffolding material such as a linear joint 2b from between adjacent tires. 2 are arranged at intervals so that they do not fall out. The plurality of tires inclined with respect to the longitudinal direction of the conveyor 22 are arranged in an orderly manner in the longitudinal direction of the conveyor. Here, a plurality of adjacent axles 25 and tires 27 are in contact with each other, and when a rotating means 29 such as an electric motor rotates one axle, all the axles 25 rotate at the same rotational speed. . Instead of bringing the axle 25 and the tire 27 into contact, all the axles may be connected by a belt or a gear so that all the tires rotate. In the conveyor 22 described above, the plurality of tires 27 attached to the plurality of axles 25 rotate in one direction while being inclined with respect to the longitudinal direction of the conveyor as indicated by arrows in FIG.

  Next, an inspection mode of the temporary scaffold material using the radioactive contamination inspection apparatus of the present embodiment will be described.

When the temporary scaffolding material 2 placed on the conveyor 22 is a substantially cylindrical scaffolding pipe 2a such as the horizontal support 2a 'shown in FIG. 1 (a) and the vertical support 2a "shown in FIG. 1 (b). The scaffold pipe 2a placed on the conveyor in the laid state is placed on the plurality of tires 27 of the conveyor 22 and is conveyed forward in the axial direction while rotating about the axis.
Here, the horizontal strut 2a ′ has a wedge portion 3 at both ends thereof, and the vertical strut 2a ″ has a locking portion 4 on its side surface. Therefore, the horizontal strut 2a ′ has a structure having a protrusion instead of a simple cylinder (pipe). However, since a certain space is formed between the plurality of tires 27 attached to the plurality of axles 25 and arranged at a predetermined interval, some protrusions are formed by using the space between the tires. Even if it is a certain scaffolding pipe 2a, the protrusions 3 and 4 escape into the space between the tires 27 and the shaft can be rotated.
In this way, when the temporary scaffolding material 2 is a substantially cylindrical scaffolding pipe 2a, the scaffolding pipe 2a is transported forward in the axial direction while rotating the scaffolding pipe, so that the scaffolding pipe 2a is only detected from the upper side by the radiation detection device 12, for example. When scanning for radioactive contamination, the entire circumference can be scanned, and the required number of radiation detectors 12 can be reduced.

On the other hand, the temporary scaffolding material 2 placed on the conveyor 22 has a surface shape or a complicated shape such as the scaffolding tread 2c, the corner bracket, the brace, the fixed jack base, and various handrails shown in FIG. In some cases, these temporary scaffolds 2 cannot be rotated by the rotation of the tires 27 of the conveyor 22 and are first transported obliquely forward. And after colliding with the wall part 31 of the conveyor 22, it is conveyed ahead of a conveyor along this, slidingly contacting with a wall part.
When the temporary scaffolding material 2 has a surface shape or a complicated shape as described above, the range to be scanned by the radiation detection device is narrowed by transporting the temporary scaffolding material 2 in a state where it is placed on the one wall surface side of the conveyor 22. And the required number of radiation detection devices can be reduced.

  Of course, two or more radiation detection devices 12 may be installed around the conveyor as necessary. In particular, when the temporary scaffolding material 2 is not a scaffolding pipe 2a but a temporary scaffolding material that does not rotate by the tires 27 of the conveyor 22, the presence or absence of radioactive contamination should be confirmed from at least the upper and lower sides of the temporary scaffolding material 2. Scanning with the radioactivity detector 14 is preferred.

  As described above, according to the radioactive contamination inspection apparatus of the present embodiment, in order to inspect the temporary scaffolding material in a state of being placed on the conveyor, it is necessary to spread the temporary scaffolding material on the floor as before. Therefore, the work can be performed even in a relatively small space. In addition, the use of a conveyor can save labor for inspection and eliminate the risk of forgetting to scan. If the temporary scaffolding material is a scaffold pipe, it can be transported while inspecting the entire circumference of the scaffolding pipe by scanning from one direction by rotating the shaft. In some cases, the range to be scanned by the radiation detection device can be narrowed down by carrying this in a state of being biased toward the one wall surface side of the conveyor.

  It should be noted that the present invention can be applied to the embodiment of the invention described above as long as the inspection work for examining the presence or absence of radioactive contamination of the temporary scaffold for work can be performed efficiently and reliably in a small work space. Of course, the present invention is not limited, and various changes can be made without departing from the scope of the present invention.

  The radioactive contamination inspection apparatus of the present invention is not limited to use at a nuclear power facility of an electric power company, and can be effectively used in all scenes where it is necessary to inspect radioactive contamination.

It is a perspective view for demonstrating various temporary scaffolding materials. It is the side view and top view of a suspension stand which comprise a radioactive contamination inspection apparatus. It is the top view and side view of a conveyor which comprise a radioactive contamination inspection apparatus. It is a figure showing the usage condition of the radioactive contamination inspection apparatus.

Explanation of symbols

2 Temporary scaffolding material 2a Scaffolding pipe 2a 'Horizontal strut 2a "Vertical strut 2b Straight joint 2c Scaffolding tread 3 Wedge part 4 Locking part 5 Support bar 6 Notch part 7 Hook 10 Radioactive contamination inspection device 12 Radiation detection device 14 Radiation detection Device 16 Suspension table 16a Leg portion 16b Arm portion 22 Conveyor 22a Outer frame 24 Hook 25 Axle 27 Tire 29 Rotating means 31 Wall portion 33 Leg portion

Claims (5)

A radiation detection device (12) provided with a radiation detector for detecting radioactive contamination of the temporary scaffolding material (2), which is an inspection object, and the placed temporary scaffolding material are scanned by the radiation detection device. And a conveyor (22) for transporting to
The said conveyor conveys temporary scaffold materials ahead, and temporary scaffold materials are scanned from the 1 or more direction by the said radiation detection apparatus, The radioactive contamination inspection apparatus of the temporary scaffold for work characterized by the above-mentioned. The temporary scaffold is a substantially cylindrical scaffold pipe (2a),
The work according to claim 1, wherein the radiation detection device (12) scans the scaffold pipe from one direction, and the conveyor (22) conveys the scaffold pipe forward in the axial direction while rotating the shaft. Radioactive contamination inspection equipment for temporary scaffolds.   The radiation detection device (12) has a structure in which a handy type radiation detector (14) is held on a suspension base (16), and scans the temporary scaffold (2) from above, from the side or from below. The radioactive contamination inspection device for a temporary scaffold for work according to claim 1 or 2.   The said suspension stand (16) has the flexible structure which can adjust the direction and position of the handy type radiation detector (14) latched, The radiation of the temporary scaffold for work of Claim 3 characterized by the above-mentioned. Contamination inspection device.   The work according to any one of claims 1 to 4, characterized in that a hook (24) is formed at one end of the conveyor (22) so as to be hooked to a lift of a truck bed. Radioactivity contamination inspection equipment for temporary scaffolds for use.

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