JPS6260599B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a workbench for inspecting, repairing, painting, etc. the outer surface of the upper half of a spherical tank for storing city gas, liquefied gas, etc.

Conventional workbenches for working on the outer surface of the upper half of spherical tanks are either equipped with a work floor or stairs and assembled with scaffolding pipes, or constructed as a truss structure to match the shape of tank a, as shown in Figure 1. A work scaffolding device b formed into an arcuate shape is adapted to rotate around the upper end of the tank a and travel in the circumferential direction on the walkway c.

However, the conventional method described above has various problems as shown below.

(b) Since the work scaffolding device b is equipped with a work scaffold over its entire length, the structure of the device is complicated;
It is heavy and the manufacturing price is high.

(b) The work scaffolding device b, which is expensive and has a complicated structure, is not allowed to be used during construction and periodic inspections because it would be unsightly to leave it on top of the tank a all the time. Although the device is installed on top of the tank a each time, due to the large weight of the device, large-scale retouching work is required when installing and removing it, which requires a great deal of cost and construction time.

(c) Because the work floor of the work scaffolding device b is provided in a stair-like manner, it is not possible to work continuously up and down the outer circumference of the tank, making the work unstable and creating blind spots during work. Poor efficiency.

(d) In addition to manually rotating the work scaffolding device b, workers also move on the stepped work floor provided in the vertical direction to perform the work, which is time-consuming and prolongs the construction period. It was the cause of

(e) In order to shorten the construction period, two work scaffolding devices b are installed at the same time, but this is not only uneconomical but also has the drawback of placing a large amount of weight on tank a.
Furthermore, in order to prevent the weight from being applied to one side, it was necessary to perform the work so that the two work scaffolding devices b were always placed in symmetrical positions.

The present invention has been made in order to solve the problems of the above-mentioned conventional system. and an outer guide rail that intersects with any horizontal line that intersects the inner guide rail and is curved so that the distance between the two intersection points is the same on the upper and lower sides, and the integrated guide A guide rail mechanism is constructed by supporting the upper end of the rail so that it can turn left and right around the top of the tank, and the guide rail mechanism is provided with a rail that rolls along each of the inner guide rail and the outer guide rail, and the This invention relates to an external movable workbench for a spherical tank, characterized in that a gondola is provided with an inner guide roller and an outer guide roller attached to the bottom of the gondola with the same distance as the distance between intersection points. .

Embodiments of the present invention will be described below with reference to the drawings.

2 and 3 are a side view and a plan view showing the outline of the present invention. A guide rail mechanism 3 is provided, the upper end of which is connected to the top rail 2 so that it can pivot in the left and right directions along the rail. The guide rail mechanism 3 includes left and right guide rails 4 and 4' integrally supported and having appropriate widths in the left and right direction, and a left and right moving roller 5 that runs on the outer surface of the tank 1. Prepared in required locations. Furthermore, the guide rail mechanism 3 is provided with a gondola 6 that is movable in the vertical direction along the left and right guide rails 4, 4'. In the figure, 1' indicates a corridor provided in the tank.

FIG. 4 is a diagram for clarifying the construction principle of the present invention, and shows the left and right guide rails 4, 4'.
are respectively an inner guide rail 7a provided along the vertically curved shape of the upper half of the tank 1, and an arbitrary guide rail 7a located on the opposite side of the inner guide rail 7a and intersecting the inner guide rail 7a. A support 8 integrally supports an outer guide rail 7b which intersects with the horizontal line and is curved so that the distance L between both intersection points is the same at any position above or below. Therefore, when the upper half of the tank 1 is a spherical curved surface, the inner guide rail 7a having a radius R slightly larger than the radius of the tank 1 and the fulcrum A of the radius R are set a distance outside the tank 1. It has a structure in which an outer guide rail 7b formed with the same radius R as above and centered around a fulcrum A' that is translated by L is integrally supported by a support 8 (see FIG. 2). The inner and outer guide rails 7a, 7
The guide rails 7a and 7a have a guide width in the inner and outer directions that is the same length as the horizontal movement distance L between the guide rails 7a and 7b.
A gondola 6 guided by the gondola 7b is mounted so as to be movable in the vertical direction. Therefore, according to the above configuration, even if the vertical position (angle θ) of the gondola 6 is changed as shown by the imaginary line, the inner and outer guide width of the gondola 6 is equal to the inner and outer guide rails 7.
Since the horizontal movement distance L between a and 7b is determined to be the same, the gondola 6 always moves up and down while being held horizontally.

5 and 6 show detailed embodiments of the present invention, in which a swing arm 1 is connected to both inner and outer ends of a bottom member 9 of a gondola 6 via a pin 10.
The middle part of the swing arm 11 is rotatably mounted, and the inner and outer guide rails 7a and 7b each have a shaped cross section, and are fitted with a slight gap between the inner and outer guide rails 7a and 7b. Inner guide rollers 12a, 12a' and outer guide rollers 12b, 12b' are mounted to rotate. At this time, the inner guide rails 12a, 12
The width between a' and the outer guide rails 12b, 12b' is the same as that of the guide rails 7a, 7b shown in FIG.
The horizontal movement distance L is determined to be the same as the horizontal movement distance L of . Further, at both ends of each of the swing arms 11, there are side press rollers 1 for holding down the bottom surfaces of the shapes of the inner and outer guide rails 7a and 7b to define the horizontal position of the gondola 6.
3,13' are installed. Of the side press rollers 13 and 13', 13' is connected to the tension spring 1.
4, the gondola 6 is constantly pushed outward to the left and right, and this makes it possible to absorb the force when the gondola 6 moves in the left and right direction or when the distance between the left and right guide rails 4 and 4' changes. It's getting old. On the gondola 6, wire winding devices 15, 15' are provided on the left and right sides, and one end of the wire winding devices 16, 16' is fixed to the upper end of the guide rail mechanism 3 or the top of the tank 1. The gondola 6 can be raised and lowered by winding and unwinding the wire with the wire winding devices 15 and 15'. The wire winding device 15,1
5' is interlocked to prevent the gondola 6 from tilting in the left-right direction due to the winding error, and furthermore, the error that may occur can be adjusted using the manual handle 17. The wire winding devices 15, 15' are operated by an operation panel 18 provided inside the gondola 6, and the gondola 6 is surrounded by a frame 19 and a wire lath material 20 for operation. We are trying to ensure the safety of our staff.

As mentioned above, the inner and outer guide rails 7
a, 7b are spaced L apart from each other in the inner and outer directions of the tank 1.
The inner and outer guide rails 7a of the gondola 6,
inner guide rollers 12a, 12 that engage with 7b;
Since the distance between a' and the outer guide rollers 12b, 12b' is determined to be the same as the distance L, the wire winding devices 15, 15' can wind up and unwind the lifting wires 16, 16'. If this is done, the gondola 6 will move up and down while always maintaining a horizontal state. Therefore, on the gondola 6, the tank 1
Inspection, repair, and painting of the vertical weld lines can be carried out continuously while moving the gondola 6, and work efficiency is improved because the gondola 6 is always kept horizontal. In addition, after the work is completed, the gondola 6 can be lowered to the lowest position (above the corridor 1'), so the gondola 6 is hidden from view from below by the corridor 1', and a guide with a simple structure is installed around the outer circumference of the tank 1. The mere presence of the rail mechanism 3 does not impair the aesthetic appearance, so the workbench can also be installed. Further, the gondola 6 can be moved up and down by button operations on the operation panel 18, and since work can be done inside the gondola 6, safety is high, and it is relatively easy to improve the working environment by using air conditioning or heating. Furthermore, in the embodiment described above, in order to shorten the construction period, a gondola 6 can be additionally provided as shown in FIGS. 2 and 3. At this time, since the gondola 6 can also be used as a guide rail, the weight of the added gondola 6 is only increased, and a large weight does not act on the tank 1. Furthermore, in the embodiment described above, the two lifting wires 16 and 16' are used to move the gondola 6 up and down, so safety is ensured even if one of the lifting wires were to break. In addition, if necessary, a safety device can be provided to immediately clamp the guide rail and fix the gondola 6 in the event that the lifting wire is cut.

Note that the present invention is not limited to the left-right turning movement method of the guide rail mechanism, but if the guide rail mechanism is turned by power, all work in the left-right (horizontal) direction and up-down (vertical) direction can be performed. The above-mentioned vertical and horizontal movements can be performed simultaneously and separately.According to the above embodiment, the gondola can be held sufficiently horizontally to the extent that it does not interfere with the work, but it is also possible to maintain more accurate leveling. If necessary, a limit switch may be provided to automatically or manually adjust the levelness, and other various changes may be made without departing from the gist of the present invention. Of course.

According to the above-mentioned external movable workbench for a spherical tank of the present invention, the following excellent effects are exhibited.

(i) By working on a gondola that moves up and down along guide rails, work can be carried out continuously without creating blind spots, and there is no risk of falling. can.

(ii) The floor of the gondola is always kept level, making work easier and safer.

(iii) by automating the operation of the gondola;
Operation can be performed easily and safely.

(iv) Automation allows workers to reach their destinations safely and quickly.

(v) A manual handle allows the gondola to be moved up and down during power outages.

(vi) Compared to conventional methods, the configuration is extremely simplified;
It also reduces weight and can be manufactured at low cost.

(vii) The workbench can also be installed on the tank because it is inexpensive and the aesthetics is not affected too much as the simplified guide rails and the like can be seen from the outside.

(viii) Since the structure is simple and lightweight, it can be transported in a small tow truck even in the event of a breakdown.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an example of the prior art, Figs. 2 and 3 are a side view and a plan view schematically showing an example of the present invention, and Fig. 4 is a diagram showing the principle of construction of the present invention. , FIG. 5 is a side view showing a detailed embodiment of the present invention, and FIG. 6 is a view taken in the negative direction of FIG. 5. 1 is a tank, 2 is a top rail, 3 is a guide rail mechanism, 4, 4' are left and right guide rails, 6 is a gondola, 7a is an inner guide rail, 7b is an outer guide rail, 8 is a support, 11 is a swing arm, 12 , 12' are guide rollers, 15, 15' are wire winding devices, and 16, 16' are lifting wires.

Claims (1)

[Claims] 1. An inner guide rail having a curved shape along the vertically curved surface on the outer surface of the upper half of the tank, and an inner guide rail located on the opposite side of the tank and intersecting any horizontal line intersecting the inner guide rail, and By integrally connecting an outer guide rail that is curved so that the distance between the intersection points is the same on the upper and lower sides, and supporting the upper end of the integrated guide rail so that it can pivot left and right around the top of the tank, the guide is created. an inner guide that constitutes a rail mechanism and that is attached to the bottom of the gondola and rolls along each of the inner guide rail and the outer guide rail and has the same distance as the distance between the intersection points; An external movable workbench for a spherical tank, characterized in that it is provided with a gondola comprising rollers and an outer guide roller.