JPH0435853Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a guide device for inspection instruments such as fiberscopes and industrial television cameras used for monitoring radioactive material storage tanks in nuclear facilities, for example.

[Prior Art] For example, radioactive material storage tanks and the like in nuclear facilities are inspected periodically or whenever necessary because damage or leakage during use may lead to serious accidents. Various inspection methods can be considered, but since signs of damage, such as minute cracks, often occur on the surface of tanks, etc., visually monitoring the condition of the tank surface is an effective means. However, radioactive material storage tanks at nuclear facilities are located inside cells with thick walls made of concrete, and for safety reasons, workers cannot enter the cells and must be monitored from outside the cells. .

For this reason, conventionally, a tubular guide tool is placed in advance along the weld line etc. of the tank, and inside the guide tool,
The method used was to introduce an inspection instrument such as a fiberscope from outside the cell and move it to observe the weld bead on the tank.

[Problem that the invention aims to solve] However, as the number of parts to be monitored increases, a large number of guide devices must be installed, and in order to introduce inspection instruments such as fiberscopes to each guide device, it is necessary to install a cell. It is necessary to drill many through holes in the side wall,
There was a risk of radiation leaking outside the cell. In addition, when changing the monitoring site, the guide tool for inserting the fiberscope or other inspection instrument must be changed, and the fiberscope must be pulled out to the outside of the cell.
There was the annoyance of having to insert the inspection instrument, such as the fiberscope, into a predetermined guide tool again.

[Means for solving problems]

The present invention was developed in view of the above circumstances, and in order to introduce and move inspection instruments such as fiberscopes or television cameras into the interior of the instrument, the present invention is arranged along multiple monitoring targets, and one end of each of the inspection instruments is introduced and moved. a plurality of aligned guide tools; and an introduction pipe section disposed such that one end thereof selectively faces each end of the guide tool in order to introduce the testing instrument into any of the guide tools. , and a means for guiding and moving one end of the introduction pipe portion to place it at one end of a predetermined guide tool.

〔Example〕

The present invention will be described below based on drawings showing embodiments thereof. FIG. 1 is a perspective view of a radioactive material storage tank in a nuclear facility using a guide device according to the present invention. In the figure, 11 is a storage tank for storing radioactive materials from a nuclear facility, and the tank 11 is installed in a cell 12 with a thick wall made of concrete.

The weld bead on the surface of the storage tank 11 is monitored using a fiberscope, and nine guide tools 21 are arranged inside the cell 12 along the weld bead of the tank 11. .
One end of each guide 21 is attached to a switching device 30 disposed opposite to one side wall of the cell, and the switching device 30 is attached to the side wall of the cell 12 to connect the outside and inside of the cell 12. One end of the communicating through pipe 14 is connected, and when the fiber scope 13 (see FIG. 2) is inserted into the through pipe 14 from outside the cell 12, the fiber scope 13 is introduced into one guide tool 21 by the switching device 30. fiberscope 1 along the guiding tool 21.
3 is moved to observe a predetermined region.

FIG. 2 is a perspective view of a guide tool 21 that guides the fiberscope 13. The guide tool 21 is a wire rod formed into a spiral tube shape, and the wire rods adjacent to each other in the axial direction of the spiral tube are arranged in a suitable manner. The fiberscope 13 moves in the axial direction within the spiral tube with a gap formed between the spiral tubes at long distances. The fiberscope 13 has the same structure as the conventional embodiment,
A reflecting mirror is placed at the tip of a flexible tube 13a that has an image guide and a liner guide inside, and the light and image transmitted by the image guide and light guide are made perpendicular to the axial direction of the flexible tube 13a. The guide tool 13 is bent in such a manner that a predetermined region can be observed from the side through the space between the wires of the guide tool 13.

FIG. 3 is a longitudinal sectional view of the switching device 30. The switching device 30 consists of a mounting part 40 and a switching part 50, and the mounting part 40 is attached to a rectangular frame 41 on the floor so as to be slightly separated from the inner surface of one side wall of the cell 12 and parallel to the side wall. The inside of the frame 41 is divided into three vertically and horizontally to form nine squares. One end of each of the nine guide tools 21 disposed within the cell 12 is attached to each square, and the end surfaces thereof are parallel to each other.

A switching section 50 attached to the attachment section 40 is disposed between the attachment section 40 and the inner surface of the cell 12. FIG. 4 is a front view of the switching section 50 from the mounting section 40 side, and FIG. 5 is a perspective view of the switching section 50. In the figure, reference numeral 51 denotes a rectangular frame, and elongated holes 51 are provided in the mounting portion 50 side portions of the left and right frame members extending in the vertical direction of the frame 51.
A has been established respectively. In each long hole 51a,
The left and right ends are rotatably fitted to the left and right outer surfaces of a horizontally elongated movable frame 52 whose left and right ends are fitted to the left and right frame members of the frame 51 so as to be slidable in the vertical direction. Each of the attached rollers 52a is fitted inside, and each roller 52a is configured to roll and move within each elongated hole 51a, and the movable frame 52 is moved in the vertical direction. One end of a wire 53 is attached to the upper surface of the moving frame 52, and one end of a tension spring 54 is attached to the lower surface thereof. The other end of the tension spring 54 is attached to the inner surface of the lower end of a support tube 55 attached to the lower surface of the frame 51. Therefore, by pulling (or relaxing) the wire 53, the movable frame 52 is moved upward (or downward) against (or by) the tensile force of the tension spring 54.

The mounting portion 40 side portion of a cylindrical connecting pipe 56 is fitted into each of the upper and lower ends of the movable frame 52 so as to be slidable in the left-right direction. A flange 56a is formed on each end face of the connecting pipe 56, and the end face on the attachment portion 40 side faces the attachment portion 40. Therefore, by vertically moving the movable frame 52, the connecting pipe 56
The vertical position with respect to the frame body 51 is changed.
At this time, the connecting pipe 56 is movable in the left-right direction.

At each of the left and right ends of the inner surface of the cell 12 of the connecting pipe 56, the upper and lower ends are connected to the top of the frame 51,
The vertically long left and right side plates of the vertically long movable frame 61 fitted into the lower frame members so as to be slidable in the horizontal direction are fitted into the connecting pipe 56 so as to be slidable in the vertical direction. has been done. Rollers 61a are rotatably attached to the upper and lower sides of the movable frame 61, respectively.
Each roller 61a is fitted into each elongated hole 51b extending in the left-right direction, which is opened in the cell 12 side portion of each upper and lower frame material of the frame 51, and each roller 61a is fitted into each elongated hole 51b. The movable frame 61 is moved in the left-right direction.

One end of a wire 63 is attached to one side of the moving frame 61, and one end of a tension spring 64 is locked to the other side. The other end of the tension spring 64 is attached to the support tube 6 attached to the frame 51.
It is locked to the inner end surface of 5. Therefore wire 6
The movable frame 61 is moved by the traction or relaxation of the frame 5.
The horizontal position relative to 1 is changed, and the moving frame 6
1, the position of the connecting pipe 56 in the left-right direction with respect to the frame body 51 is changed. Further, as described above, the movable frame 52 is moved in the vertical direction by the operation of the wire 53, and the vertical position of the connecting pipe 56 with respect to the frame 51 is changed. The position is fixed and is opposed to the end surface of a predetermined guide tool 21 in the mounting portion 40 .

One end of a flexible tube 57 is attached to a flange 56a at the inner end of the cell 12 in the connecting pipe 56, and the other end is fitted into the inner end of the cell 12 of the through pipe 14 penetrating the side wall of the cell 12. It is worn. Therefore, the connecting tube 56, the flexible tube 57, and the through pipe 14 are for introducing the fiberscope into each guide tool 21 from the outside of the cell, and these constitute an introduction tube section. In addition, each wire 5 mentioned above
3 and 63 extend to the outside of the cell 12 through the through pipe 14, and are operated outside the cell 12.

[Effect]

When monitoring the surface of the storage tank 11 etc. using the present device configured as described above, the wire 5 is connected in advance.
3 and 63 from outside the cell 12 to connect the connecting pipe 56.
The end face is moved to a position facing the end face of the predetermined guide tool 21 in the fixture 40. In this case, the connecting pipe 56 is moved vertically by pulling or relaxing the wire 53, and horizontally by pulling or relaxing the wire 63.

In this state, the through pipe 1 outside the cell 12
When the tip of the fiberscope 13 is inserted from the 4th end surface, the tip of the fiberscope 13 is inserted into the through pipe 14.
The liquid is guided into the flexible tube 57 in the cell 12, and further into the connecting tube 56 in the switching section 50 of the distribution device 30. Then, the tip of the fiberscope 13 is introduced into a predetermined guide tool 21 facing the end surface of the connecting tube 56, and thereafter the tip of the fiberscope 13 is moved along this guide tool 21.

As described above, the guide tool 21 is disposed along the monitoring area such as the weld bead of the tank 11, so the tip of the fiberscope 13 is moved along the monitoring area, and from between the threads of the guide tool 21. An image of the monitored region is captured and projected onto a predetermined receiver outside the cell 12 by an image guide.

In the above-described embodiment, a fiberscope is used as the inspection instrument introduced into the guide, but it is also possible to use a relatively small industrial television camera.

〔effect〕

According to the present invention, even when changing the guide in which to insert an inspection instrument such as a fiberscope among multiple guide instruments installed indoors along each part to be monitored, the inspection instrument can be inserted. Changes can be made by operating the wire from outside without having to take it outside, significantly improving operability. In addition, since there is only one introduction pipe that communicates between the indoor and outdoor areas, there is no risk of radiation leaking outside the cell even when monitoring a storage tank for radioactive materials as in the above example, and the work can be done safely. I can do it.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention.
The figure is a perspective view of a radioactive material storage tank using the guide device according to the present invention, Figure 2 is a perspective view showing how the guide is used, Figure 3 is a sectional view of the switching device, and Figure 4 is the switching section thereof. FIG. 5 is a front view and a perspective view thereof. 11...Storage tank, 12...Cell, 13...
Fiberscope, 14... Penetration pipe, 21...
... Guide tool, 30 ... Switching device, 40 ... Mounting part,
41...frame body, 50...switching section, 51...frame body,
52, 61...Moving frame body, 53, 63...Wire, 54, 64...Tension spring, 56...Connecting pipe, 57...Flexible tube.

Claims (1)

[Scope of utility model registration request] A plurality of guide tools arranged along a plurality of monitoring targets and with one end of each of the guide tools aligned in order to introduce and move inspection instruments such as fiberscopes or television cameras inside the guide tools, and any one of the guide tools. an introduction pipe section disposed such that one end of the introduction pipe selectively faces each of the ends of the guide tool in order to introduce the testing instrument into the interior of the guide tool; 1. An inspection instrument guiding device comprising means for guiding and moving the instrument so as to place the instrument in the inspection instrument.