JPH0315710Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a working floor for working on the inner surface of the roof of a storage tank and for inspecting and repairing after completion.

(Prior art) Tanks (storage tanks) that store liquefied petroleum gas, etc. are regularly maintained and inspected, but when inspecting the inner surface of the tank roof, a large scaffold is required for inspection. Become.

Therefore, Japanese Utility Model Application Publication No. 59-15757 proposes a work floor in which a long walkway is provided on the inside of the tank roof from the center of the roof to the periphery, and is rotatable around the center.

In this case, a fixed deck is supported at the center of the work floor at the lower center of the roof, and one end of the walkway is connected to the fixed deck so as to be freely rotatable.

In the middle of the walkway, it is suspended and supported via running wheels from a ring-shaped rail arranged on the inner surface of the roof.
For example, when the tip of the walkway is pushed in the circumferential direction from a gallery provided at the periphery of the tank, the walkway rotates along the inner surface of the roof.

(Problem to be solved by the invention) By the way, in the case of the above-mentioned work floor, the walkway is supported through running wheels, but the running wheel frame and the walkway are integrally connected via a suspension frame. For example, if the rails installed on the inner surface of the roof are improperly installed and distorted, the running wheels may become twisted and cannot move smoothly.

Additionally, when the roof of the tank expands due to outside temperature, etc., the position of the rail shifts in the radial direction, making it difficult for the running wheels to move smoothly even in such cases, which reduces the turning ability of the walkway. The problem was that it worsened the situation.

(Means for solving the problem) In order to solve the problem, this invention has a structure in which the center is supported at the upper center of the storage tank, while
A storage tank in which a walkway extending from the center to the periphery of the tank is suspended from rails arranged in an annular manner on the inner surface of the roof of the storage tank via running wheels and a suspension frame, and can rotate along the inner surface of the roof with the center as a fulcrum. In the work floor for inspecting the inner surface of the roof, the connecting portion between the traveling wheel frame and the suspension frame and the connecting portion between the suspension frame and the walkway are each connected by pins that are freely rotatable in the extending direction of the walkway.

(Function) Therefore, if the rail installed on the inner surface of the roof is distorted or the rail position shifts due to expansion of the roof, the deformation will be prevented by the pin connection between the running wheel frame, suspension frame, and walkway. Therefore, the movement of the running wheels is always maintained in good condition.

(Embodiment) FIGS. 1 to 4 each show an embodiment of the present invention, in which 1 is a peripheral wall of a storage tank, and 2 is a dome-shaped roof thereof.

A center frame 3 is attached to the center of the roof 2, and a circular deck 4 is attached to the center frame 3.
is fixedly supported.

Below the fixed deck 4, the base 6 of the walkway 5 is rotatably attached to the center frame 3 via rollers, etc., and the side frame 7, which also serves as a handrail of the walkway 5, is connected to the handrail 8 on the fixed deck 4 side. has been done.

The handrail 8 is rotatably suspended and supported along with the walkway 5 by a rail 9 disposed annularly on the inner surface of the upper roof 2 via rollers (not shown).

The walkway 5 runs from the center 11 side to the peripheral edge 1 of the storage tank along the inner surface of the roof 2 via several connecting parts 12.
3, with a roof 2 in the middle.
Running wheels 15, 16 and a suspension frame 17 are mounted on a rail 14 arranged concentrically with the rail 9 on the inner surface.
It is supported by hanging through.

A plurality of rollers 18 rolling on flanges 19 of the running wheels 15 and 16 with the rail 14 in between are attached to wheel frames 20 and 21, and the lower portions of the wheel frames 20 and 21 are connected to the supports 2 of the suspension frame 17.
2 and 23 are connected to the upper ends thereof by a fifth pin 24 so as to be freely rotatable in the extending direction of the walkway 5.

In the suspension frame 17, the walkway 5 is arranged on a beam 25 fixed to the pillars 22 and 23, and the lower part of the side frame 7 of the walkway 5 and the beam 25 are connected to each other by pins 26 as shown in FIG. It is connected so that it can rotate freely in the direction.

Note that the running wheels 15 are provided with a drive gear 28 that rolls the rollers 18 by moving a lever 27.

Further, 29 is a floor plate of the walkway 5, and a ramp 31 is attached to the tip of the walkway 5 for getting down to a corridor 30 provided on the peripheral wall 1 of the storage tank.

With this configuration, if the rail 14 disposed on the inner surface of the roof 2 is distorted or the position of the rail 14 shifts due to expansion of the roof 2, the traveling wheels 15 and 16 will not engage with the rail 14. As it is, the suspension frame 17 supporting the walkway 5 is connected to the wheel frame 2.
Pin 2 of the connecting part with 0, 21 and the connecting part with the walkway 5
It begins to tilt like a swing with 4 and 26 as fulcrums.

As a result, deformation due to distortion or positional deviation of the rail 14 can be released, and the running wheels 15, 1
6. Unreasonable force or twisting is prevented from being applied to the suspension frame 17 and the walkway 5.

Therefore, the strength of each part is increased, and the running wheels 15 and 16 are always kept running smoothly, making it possible to rotate the walkway 5 favorably along the inner surface of the roof 2.

In addition, in the case of a storage tank for storing liquefied gas, the inside of the storage tank is at an extremely low temperature, so the rail 14 is deformed greatly due to the expansion of the roof 2, but even in such a case, the traveling wheels 15, 16 and the suspension frame 17 , no excessive force is applied to the walkway 5, etc., and if the floorboard 29 of the walkway 5 is made removable, high safety can be ensured even in the event of an earthquake.

(Effects of the invention) As described above, in this invention, the connecting parts of the traveling wheel frame, the suspension frame, and the walkway are connected by pins, so the walkway can smoothly rotate along the inner surface of the roof regardless of the deformation of the rail. It has the effect of being able to

[Brief explanation of the drawing]

1 and 2 are an overall side view and a plan view showing an embodiment of the present invention, FIGS. 3 and 4 are a partial side view and a view taken along line A-A, and FIG. 5 , FIG. 6 is an enlarged view of the main part of FIG. 4. 2... Roof, 5... Corridor, 11... Center, 1
3... Peripheral part, 14... Rail, 15, 16...
Running wheels, 17...Suspension frames, 20, 21...
...(Traveling) wheel frame, 24, 26...pin.

Claims (1)

[Scope of utility model registration request] The center part is supported by the upper center of the storage tank, while a walkway extending from the center part to the periphery of the tank is suspended via running wheels and a suspension frame from a rail arranged in a ring on the inner surface of the roof of the storage tank. On the work floor for inspecting the inner surface of the roof of the storage tank, which can rotate along the inner surface of the roof with A work floor for inspecting the inner surface of a storage tank roof, characterized by a free pin connection.