JPH0435852Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a guide for inspection instruments such as fiberscopes and industrial television cameras used to monitor 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 at any time as necessary because damage or leakage during use may lead to serious accidents. Various testing methods are possible, but
For example, since minute cracks often appear on the surface of a tank, etc. as a sign of damage, visually monitoring the condition of the tank surface is an effective means.
However, radioactive material storage tanks at nuclear power facilities are installed in cells with thick walls made of concrete, and for safety reasons, workers cannot enter the cells and must monitor them from outside the cells.

In the conventional monitoring method, a fiberscope guide tube is installed in advance facing the area to be monitored on the surface of a radioactive material storage tank or inside a cell.
By inserting a fiberscope into the guide tube and moving it, an image of the area to be monitored is transmitted to the outside of the cell, and the image is visually observed for monitoring. FIG. 6 shows how the guide tube is used in such a conventional method. In the figure 9
Reference numeral 1 denotes a guide tube, and a slit 91a is opened in the axial direction in a portion of the guide tube 91 that faces the monitoring target site, and the fiberscope 13 inserted into the guide tube 91 is inserted through the slit 91a of the guide tube 91. It was now possible to capture images of the area being monitored through the camera.

[Problem that the invention attempts to solve]

With this type of guide tube, the slit extending in the axial direction cannot be formed as part of the outer circumference, and therefore only the part facing the slit can be observed, so if there are many objects to be monitored, more guide tubes must be installed. The need arose. Further, although the guide tube has a slit, it is not easy to bend the guide tube, and it is difficult to align the guide tube along the monitoring target area at a constant distance.

[Means for solving problems]

The present invention was developed to solve this problem, and it is designed to guide inspection equipment such as a fiberscope that observes the surface of the tank that stores radioactive materials installed inside the cell or the inner surface of the cell. In the arranged guide tool for the inspection instrument, a wire having a gap between the threads is formed into a spiral tube shape, and an inspection instrument such as a fiberscope is introduced into the spiral tube and is moved from the gap. This was done to observe the test object.

〔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 the guide device according to the present invention. In the figure, 11 is a storage tank for storing radioactive materials from a nuclear facility, and this tank 11 has a cell 1 with a thick wall made of concrete.
It is located within 2. The weld beads on the surface of the radioactive material storage tank 11 are monitored using a fiberscope, and nine guides according to the present invention are installed inside the cell 12 along the weld beads of the tank 11. A tool 21 is provided. 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 through pipe 14 that communicates with the cell 12 is connected to the cell 12.
A fiberscope 1 is inserted into the through pipe 14 from the outside.
3 (see FIG. 2), the fiberscope 13 is introduced into one guide tool 21 by the switching device 30, and the fiberscope 13 is moved along the guide tool 21 to observe a predetermined region. It's getting old.

FIG. 2 is a perspective view of a guide tool 21 according to the present invention that guides the fiberscope 13, and the guide tool 21 is formed from a wire rod into a spiral tube shape, and the guide tool 21 is made of a wire material formed into a spiral tube shape, and the guide tool 21 is made of a wire material formed into a spiral tube shape, and the guide tool 21 is made of a wire material formed into a spiral tube shape, and the guide tool 21 is made of a wire material formed into a spiral tube shape, and the guide tool 21 is made of a wire material formed into a spiral tube shape, and the guide tool 21 is made of a wire rod formed into a spiral tube shape, and the guide tool 21 is made of a wire rod formed into a spiral tube shape, and adjacent to each other in the axial direction of the spiral tube. The fiberscope 13 is moved in the axial direction within the spiral tube by separating the wire rods by an appropriate length to form a gap between the spiral threads. The fiberscope 13 has the same structure as the conventional embodiment, and has a flexible tube 13a with an image guide and a light guide arranged inside, and the tips of the image guide and light guide are aligned in the axial direction of the flexible tube 13a. It is optically bent so that it is at right angles to the
A predetermined region can be observed from the side through the space between the wires of the guide tool 21.

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 parallel to and slightly apart from the inner surface of one side wall of the cell 12. The inside of the frame 41 is divided vertically and horizontally into three to form nine squares. One end of each of the nine guide tools 21 disposed within the cell 12 is attached to each square.

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 fitted to the left and right frame members of the frame 51 so as to be slidable in the vertical direction. The rollers 52a attached to the rollers 52a are fitted inside, and the rollers 52a are configured to roll and move within the respective elongated holes 51a, so that 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.

A portion of a cylindrical connecting pipe 56 on the side of the mounting portion 40 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 5
6, the vertical position relative to the frame 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 connected to a support tube 65 attached to the frame 51.
It is locked to the inner end surface of. Therefore, the wire 63
The moving frame 61 is moved by the traction or relaxation of the frame 51
The horizontal position of the movable frame 61 is changed.
Due to this movement, the horizontal position of the connecting pipe 56 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 wires 53, and the vertical position of the connecting pipe 56 with respect to the frame 51 is changed, and by fixing each wire 53, the frame
The position of the connecting pipe 56 relative to the connecting pipe 1 is fixed, and the connecting pipe 56 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. Further, each of the above-mentioned wires 53 and 63 is extended to the outside of the cell 12 through the through pipe 14, and is operated outside the cell 12.

[Effect]

Guide tool 21 and switching device 30 configured as described above
radioactive material storage tank 11 and cell 12 using
When monitoring the inner surface, wires 53 and 6 are connected in advance.
3 from outside the cell 12 to move the end face of the connecting pipe 56 to a position facing the end face of a predetermined guide tool 21 in the fixture 40. In this case, the connecting pipe 5
6 is moved in the vertical direction by pulling or relaxing the wire 53, and in the left-right direction by pulling or relaxing the wire 63. In this state, when the tip of the fiberscope 13 is inserted from the end surface of the through pipe 14 outside the cell 12, the tip of the fiberscope 13 is guided by the through pipe 14 and introduced into the flexible tube 57 inside the cell 12, and is further inserted into the distribution device. 30 into the connecting pipe 56 in the switching section 50. 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 the tip of the fiberscope 13 is moved between the threads of the guide tool 21. An image of the monitored region is captured, and the image is projected onto a predetermined image receiver outside the cell 12 by an image guide.

In the above-described embodiment, a fiberscope is used as the inspection instrument, but the present invention is not limited to this, and a relatively small industrial television camera or the like may also be used.

〔effect〕

Since the guide tool of the present invention is made of a wire material formed into a spiral shape, it has excellent flexibility and can be easily placed along a predetermined monitoring area. In addition, the guide device according to the present invention allows monitoring in all directions, so multiple locations can be monitored with one guide device.
Therefore, the number of guide tools can be reduced, etc.
The present invention has excellent effects.

[Brief explanation of drawings]

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, FIG. 2 is a perspective view showing the usage state of the guide device according to the present invention, FIG. 5 is a front view of the switching section, FIG. 5 is a perspective view thereof, and FIG. 6 is a perspective view showing the state in which the conventional guide tool is used. 11... Radioactive material storage tank, 12... Cell, 13... Fiber scope, 14... Penetration pipe, 21... Guide tool, 30... Switching device, 40
...Mounting section, 41...Frame body, 50...Switching section, 5
1... Frame body, 52, 61... Moving frame body, 53, 6
3... Wire, 54, 64... Tension spring, 56
...Connecting pipe, 57...Flexible pipe.

Claims (1)

[Scope of utility model registration request] A wire rod is formed into a spiral tube shape with a gap between the threads, and an inspection instrument such as a fiberscope or a television camera is introduced into the spiral tube, and while the inspection instrument is moved, the spiral tube is A guide tool for an inspection instrument, characterized in that it is configured to observe an object to be inspected from a distance.