JPH0528280Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to the improvement of an inspection device for inspecting the inner surface of the roof of an above-ground or underground large tank. It also allows for full inspection.

[Conventional technology]

Aboveground or underground tanks are used to store large amounts of oil, liquefied petroleum gas (LPG), liquefied natural gas (LNG), etc.

In order to ensure safety, such tanks must be periodically inspected for welding defects, cold storage conditions, etc. in each part.

A workbench is required to inspect the inner surface of the tank roof during this inspection work.

Therefore, as shown in FIG. 7, for example, a support shaft 3 is installed at the center of the inside of the roof 2 of the underground tank 1, and an inspection device 5 is provided, which is constructed by attaching a rotating workbench 4 to the support shaft 3 so as to be able to rotate the support shaft 3. Often.

[Problem that the invention attempts to solve]

However, in the underground tank 1, a pipe 6 is provided through the roof 2 for supplying and discharging the stored liquid, and the range in which inspection work can be performed by rotating the rotating work platform 5 of the inspection device 5 is as shown in Fig. 8. Only the portion inside the pipe 6 indicated by the diagonal line A is inside.

Therefore, in order to inspect the annular roof 2 outside the pipe 6, an inspection deck 7 is hung from the roof 2 and installed around the entire circumference.

In this way, in the past, the roof 2 had to be used in addition to the rotating inspection device 5 as well as the fixed inspection deck 7.
There are problems in that the entire surface cannot be inspected, equipment costs increase, and the efficiency of inspection work is low.

This invention was devised in view of the problems of the conventional technology, and is an inexpensive and highly efficient tank roof inner surface inspection device that can inspect the entire roof surface while moving in a stable state. This is what we are trying to provide.

[Means for solving problems]

In order to solve the above-mentioned problems, this device for inspecting the inner surface of a tank roof has a support shaft that protrudes downward from the center of the inside of the tank roof, and a ring-shaped rail that is concentric with the support shaft. A trolley that can run along this annular rail is installed, and the base of the revolving work platform is formed in a shape that follows the inner surface of the roof, has a maximum length that can rotate 360 degrees, and is equipped with a treadle for work over the entire length. The end part is rotatably attached to the support shaft and the middle part is connected to the trolley, while a treadle for work is provided at the tip of the swing workbench over the entire length with a length that reaches the outer periphery of the roof. The stand is expandable and retractable,
The present invention is characterized by the provision of a telescoping operation mechanism for telescoping and retracting the slide workbench while avoiding obstacles during turning.

[Effect]

It consists of a rotating workbench with the maximum length that can rotate the tank roof inner surface inspection device 360 degrees, and a sliding workbench installed at the tip of this workbench that is long enough to extend to reach the outer circumference of the roof. The slide workbench is extended from the revolving workbench to which the part is attached, and the slide workbench is rotated in an area free of obstacles such as through piping, and the outer periphery is inspected. The workbench is retracted and swiveled for inspection, and the entire roof can be inspected with one device while adjusting the expansion and contraction of the sliding workbench using the telescoping operation mechanism.

In addition, the rotating workbench is supported by a support shaft and a trolley that runs along an annular rail, allowing work to be carried out in a stable state.

〔Example〕

Hereinafter, one embodiment of the tank roof inner surface inspection device of this invention will be described in detail with reference to the drawings.

In this tank roof inner surface inspection device 10, the base end of a swing workbench 12 is attached via a bearing to a support shaft 11 installed to protrude downward from the inner center of the roof 2 of an underground tank 1. The tip end is supported via a running trolley suspended from a rail attached to the roof 2, and is driven to rotate by a gear mechanism and a rotation drive device such as an electric motor.

As shown in FIGS. 1 to 4, the rotating workbench 12 has a maximum length that allows it to rotate 360 degrees without interfering with obstacles during the rotation, such as the piping 6 that penetrates the underground tank 1. It is bent at several points so as to be at regular intervals with the inner surface of the tube, and has the width necessary for inspection work. A treadle 12b is attached in a stair-like manner between the frames 12a on both sides, and a handrail 12c is attached to form a rotating workbench 12.

The tip of the swing workbench 12 fits on the outside of the swing workbench 12 and expands and contracts, and when extended, it takes the shape of an extension of the swing workbench 12 and has a roof 2.
A slide workbench 13 is provided that reaches the outer periphery of the machine.

This slide workbench 13 is shown in FIGS. 4 and 5.
As shown in the figure, the space between the frames 13a on both sides is slightly wider than the space between the outer sides of the frames 12a of the rotating workbench 12, and a step-shaped treadle 13b is installed between these frames 13a. A slide 13c is attached.

Such a sliding workbench 13 is used as a rotating workbench 1.
2, the tread plate 13b of the slide workbench 13 touches the treadle 1 of the swing workbench 12.
As shown in FIG.
Guide rail 1 in which 4a and inclined portion 14b are continuous
4 is attached to the guide rail 14, and a roller 15 attached to the inside of the frame 13a of the slide workbench 13 rolls within this guide rail 14.

Therefore, the slide workbench 13, which is extended and straightened at the tip of the swing workbench 12, is
After being drawn into the lower side of the rotating work platform 12 along the horizontal portion 14a of the guide rail 14, the inclined portion 14
It is stored along line b and is in a contracted state.

As a telescoping operation mechanism 16 for telescoping the sliding workbench 13, a hoisting device 17 having a pair of drums 17a disposed on both sides of the frame 12a is provided in the middle of the rotating workbench 12, and a hoisting device 17 is provided at the tip of a wire 17b. section is connected to the slide workbench 13.

Therefore, by winding the wire 17b around the drum 17a of the hoisting device 17, the slide workbench 13 can be contracted, and conversely, by letting out the wire 17b, the slide workbench 13 can be extended.

Further, a fixing device (not shown) is provided to fix the extended slide workbench 13 to the swing workbench 12, and can be fixed using a hook or the like.

Tank roof inner surface inspection device 1 configured as above
According to No. 0, in a range where there are no turning obstacles such as piping 6 that penetrates the roof 2, the slide workbench 13 is extended by the telescopic operation mechanism 16 and locked by a fixing device (not shown), and the work table is turned in this state. While doing so, inspect the outer periphery of the roof 2.

On the other hand, in the range where the piping 6 etc. that penetrates poses an obstacle to the rotation of the inspection device 10, the slide workbench 13 is shortened by the telescopic operation mechanism 16 to a length that does not interfere with the piping 6, and while turning in this shortened state, Inspect up to the piping 6 on the roof 2. And piping 6
Also between the roofs 2, the roof 2 is inspected with the slide workbench 13 extended.

If the tank roof inner surface inspection device 10 is used to perform inspection while adjusting the expansion and contraction of the slide workbench 13, as shown in FIG. Only the outer peripheral part of the width of the pipe 6 is inspected, and the other parts can be inspected by moving the inspection device 10.
The shaded area B is also within the range that can be inspected by extending the inspection device etc. from the slide workbench 13 that has been moved to both sides, and substantially the entire range of the roof 2 can be inspected.

Therefore, there is no need to install a fixed workbench such as an inspection deck separately from the inspection device 10, equipment costs are low, and inspections can be carried out efficiently without the need for workers to transfer.

In addition, although the above-mentioned example was explained in the case of an underground tank, it can also be applied to the case of an above-ground tank.

Moreover, although only one slide workbench is provided and it is extended and contracted by the telescoping operation mechanism, it is also possible to provide a plurality of slide workbenches to enlarge the range of expansion and contraction. Furthermore, the telescopic function is not limited to the winding type, but may be other mechanisms such as a rack and pinion.

[Effect of idea]

As described above in detail with one embodiment, the tank roof inner surface inspection device of this invention includes a rotating work platform whose base end is rotatably attached to the inner center of the roof, and an extendable and retractable work platform at the tip thereof. The inspection device consists of a slide workbench that is extendable and retractable via an operating mechanism, so the roof can be inspected while moving while adjusting the extension and contraction of the slide workbench to avoid interference with rotating obstacles such as piping. The entire roof can be inspected without the need for a separate fixed workbench.

Therefore, compared to conventional devices, there is no need for a fixed workbench, which makes it possible to reduce the cost, and also eliminates the need for transfers, allowing for efficient inspection work.

Furthermore, since the swing workbench is supported by a trolley that runs along the support shaft and the annular rail, it is possible to work in a stable state when working on the swing workbench or slide workbench.

[Brief explanation of drawings]

Figures 1 to 6 show an embodiment of the tank roof inner surface inspection device of this invention, with Figure 1 being a schematic front view of the whole, Figure 2 being a schematic plan view of the whole, and Figure 3 being the inspection device. Fig. 4 is a partial plan view of the inspection device, Fig. 5 is a partial cross-sectional view of the inspection device, and Fig. 6 is a partial front view of the inspection device.
The figures are partially enlarged views of the rotating work platform, Figures 7 and 8.
The figures are a schematic front view and a schematic plan view of a conventional device. 1... Underground tank, 2... Roof, 6... Piping,
10...Inspection device, 11...Support shaft, 12...Swivel workbench, 12a...Frame, 12b...Treadboard, 12c...Handrail, 13...Sliding workbench, 13a...Frame, 13b... Treadboard, 13
c... Handrail, 14... Guide rail, 15...
Roller, 16... telescopic operation mechanism, 17... hoisting device, 17a... drum, 17b... wire.

Claims (1)

[Scope of utility model registration request] A support shaft is installed at the center of the inside of the tank roof protruding downward, a ring-shaped rail is installed on the inside of the tank roof concentrically with this support shaft, and a trolley that can run along this ring-shaped rail is installed. The base end of a revolving work platform, which is formed in a shape that follows the inner surface of the roof and has a maximum length that can rotate 360 degrees and is equipped with a tread for work over the entire length, is rotatably attached to the support shaft, and the intermediate part is attached to the trolley. On the other hand, a slide workbench is provided at the tip of the swing workbench that is extendable and has a tread for use over the entire length that reaches the outer periphery of the roof. An inspection device for the inner surface of a tank roof, characterized in that it is equipped with a telescoping operation mechanism that allows the tank roof to be telescopically moved while avoiding the damage.