JPH0729139Y2 - Working unit for spherical tanks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a working unit for a spherical tank, and more particularly to a working unit for performing maintenance and inspection work on the lower hemisphere of the spherical tank.

[Prior Art] There are various types of tanks for storing gases such as city gas and liquids, but the minimum surface area, that is, the maximum volume can be obtained with the minimum amount of materials used, and the strength against internal pressure is high. As a large one, a spherical tank is often used.

As shown in FIG. 6, in this type of spherical tank, a large number of columns 2 are provided upright on a concrete foundation 1 provided on the ground surface, and the tank body 3 is supported by these columns 2. Has become.

The tank body 3 has a corridor 4 along its equator position.
Is formed, and the pedestal 2 is provided with a tie rod 5 that connects them to each other.

On the other hand, since such a spherical tank is also a pressure vessel, it is obliged to regularly check the safety not only at the construction stage but also after the start of operation to confirm the safety.

For this reason, conventionally, when performing maintenance and inspection of the outer surface of the main body 3, the mounting portion between the main body 3 and the pedestal 2, the pedestal 2 and the tie rod 5, which are the lower hemispherical portion of the spherical tank, it is shown in FIG. As described above, the temporary scaffold 6 is assembled on the concrete foundation 1 and the predetermined work is performed by using the scaffold 6 as a work table.

[Problems to be solved by the invention] However, since the work surface of the workbench is hemispherical, the construction of the temporary scaffold 6 is very complicated and requires a long time, and the concrete of the tank body 3 is Foundation 1
The scaffolding material was needed for the cross-sectional area of the equator, which corresponds to the projected area of the scaffold. In addition, since there is no space below the tank body 3 because it is occupied by the scaffolding material, it is difficult to prepare for work. In addition, when trying to perform maintenance work on the outer surface near the equator, the upper part of the pedestal 2 or the tie rod 5, a larger total scaffold than that shown in the figure is required, which is very difficult to realize. .

In view of the above circumstances, the present invention was devised to provide a working unit that does not require a large-scale temporary scaffold and that does not impair the safety of the tank.

[Means for Solving the Problems] The present invention provides a circular arc-shaped first rotatably provided in an inner portion of a pillar of a spherical tank along a meridian of the spherical tank and around a vertical axis of the spherical tank. One work platform,
A second work platform provided along the pillar of the spherical tank and connected to the first work platform.

In addition, it is preferable that the above-mentioned configuration is provided with a third work platform that is hung along the pedestal so as to be able to travel on a traveling track provided in the corridor portion of the spherical tank.

Further, the second and third work platforms may be configured to have a scaffold portion that retracts when the work platform travels on a track and advances in a substantially horizontal direction during work.

[Operation] With the above configuration, the first work platform opposes a portion of the outer surface of the lower hemisphere of the spherical tank corresponding to the length of the platform in the meridian direction, and forms a scaffold for maintenance and inspection work. Then, when the work of the facing portion is completed, it is rotated around the vertical axis of the spherical tank to face the other adjacent portion. By repeating this movement, most of the outer surface of the lower hemisphere can be maintained and inspected. Further, the second work platform approaches the pedestal along with the movement of the first work platform, and maintenance work of the lower part of the pedestal corresponding to the height section of this work platform can be performed.

In addition, in the configuration including the third work platform,
By moving along the running track, maintenance and inspection work can be performed on the rest of the pedestal and the rest of the outer surface of the lower hemisphere, which cannot be done by the first and second work platforms.

Further, in the configuration having the scaffolding portion that retreats and advances, it can be approached by the pedestal only during work, and the work platform does not interfere with the pedestal during movement.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment of a working unit for a spherical tank according to the present invention, and show a case where an existing spherical tank is inspected and maintained.

This work unit includes a first work platform 18 supported by traveling carriages 13 and 14 traveling on circular orbits 11 and 12 via columns 15, 16 and 17, and a second work provided on the column 15. The pedestal 19 and
Further, it is mainly configured by a third work platform 20 that is provided so as to be hung from the corridor portion 4.

The ring-shaped tracks 11 and 12 are formed in two lines on the concrete foundation 1 so as to draw a concentric circle with the vertical axis A of the tank body 3, and the running rails 21 and 22 and the heights thereof are respectively adjusted. It is composed of adjusting stands 23 and 24.

As shown in FIG. 3, the traveling carriages 13 and 14 are mounted on the traveling rails 21,
It has a plurality of wheels 25 engaging with 22, and one of the wheels 25 is driven on a traveling rail 21, 22 by being driven via a chain 27 and a sprocket 28 by a drive device 26 including a motor and a speed reducer. It is designed to run on its own.

The first work platform 18 is formed by assembling structural members 29 in a truss shape so as to have a predetermined total length, and has a scaffolding plate 30 that becomes substantially horizontal when held close to the tank body 3. . In the present embodiment, the work platform 18 is divided into an upper portion 31 and a lower portion 32, each of which is formed in an arc shape along the meridian of the inner portion of the pedestal 2. Then, they are fastened to each other by bolts 33 formed so that the contact angle at these abutting positions can be finely adjusted. The upper part 31 is held near the tank main body 3 mainly by a pillar 15 standing upright from the outer traveling carriage 13 and a pillar 16 obliquely provided so as to branch from the middle of the pillar 15. Are mainly held close to each other by columns 17 standing upright from an inner traveling carriage 14.

The second work platform 19 is formed by assembling the structural members 34 in a stepwise manner along the column 15 in a height direction, and is projected so as to face the pedestal 2, and the pedestal main body 35 is further extended to the pedestal 2. Scaffolding portions 36 that are close to the side are provided so as to be movable back and forth at predetermined intervals in the height direction.

As shown in FIG. 4 and FIG. 5, the scaffolding part 36 is composed of a plate member 38 supported from a gantry body 35 side by a long and short suspension chain 37, and is folded when the traveling carriage 13 and the column 15 move, It is formed with a hinge connection structure so that it can be deployed in a substantially horizontal direction at the time of work such as maintenance and inspection.

Further, the plate members 38 are arranged side by side in a set of three pieces so as to form the scaffold portion 36 at one place, and are pin-connected to each other, and the handrail ( Holes 39 are provided for mounting (not shown). Further, the hanging chains 37 are connected to the respective plate members 38 at four locations via brackets 40. Further, the vertical structural member 51 forming the gantry body 35 is provided with holes 52 for supporting the plate member 38 in an extendable manner at substantially equal intervals in the longitudinal direction, so that the scaffold member 36 can be appropriately transferred. .

The third work platform 20 is constructed by assembling the structural members 41 so as to have a predetermined length (overall length) and width in a similar manner to the second work platform 19, and is located at the position of the equator B of the tank body 3. An upper end portion is engaged with and held by a traveling track 42 formed in the provided corridor portion 4. Wheels 43 and a traveling drive unit (not shown) are provided at the upper end portion so that the vehicle can turn along the traveling track 42, that is, along the equator B. Further, the lower end portion is extended to the vicinity of the upper end of the second work platform 19, and a guide wheel 45 engaging with a guide rail 44 protruding in the middle of the pedestal 2 is provided to guide the turning movement. It is supposed to do. A scaffold portion 47 made of a plate member 46 is provided in the same manner as the second work platform 19, and is positioned near the outer surface of the lower hemisphere near the equator B and the upper portion of the pedestal 2.

Next, the operation of this embodiment will be described.

When performing maintenance work such as painting or safety inspection of the outer surface of the spherical tank, first, the first work platform 18 and the second work platform 19 are set on the traveling carriages 13 and 14. On the first work platform 18, the worker stands on the scaffolding plate 30 to perform maintenance and inspection work on the facing portion of the outer surface of the tank body 3. When the work of that part is completed, by moving the traveling carriages 13 and 14 concentrically with the tank body 3,
Perform the work by facing the next work target position.

Further, in the second work platform 19, when the support column 15 is positioned close to the pedestal 2, the worker stands on the expanded plate member 38 to perform maintenance work on the pedestal 2. Further, when it is in a position where it does not approach the pedestal 2, the plate member 38 is folded so that the turning movement is not hindered. with this,
At the time when the traveling carriages 13 and 14 make a round on the circular orbits 11 and 12, maintenance and inspection of the outer surface of the lower hemisphere below the first work platform 18 and the lower portion of each pedestal 2 are performed. .

On the other hand, in the third work platform 20, a worker
By standing on top, the tank body 3 corresponding to its width
Maintain and inspect the outer surface of the lower hemisphere. When the pedestal 2 is pivotally moved to a position close to the pedestal 2, maintenance of the upper portion of the pedestal 2 and the mounting portion with the tank body 3 is performed.
Therefore, when the work platform 20 makes one round along the equator B, the remaining portion of the spherical tank, which could not be formed by the first and second work platforms 18 and 19, can be maintained and inspected.

In this way, since the work platforms 18, 19, 20 that move along the track are located close to the tank body 3 and the pedestal 2, the conventional large-scale scaffolding is not required, and it is easy and short time. Can be constructed and removed, and the space below the tank body 3 can be effectively used. Further, since the ring-shaped orbits 11 and 12 and the traveling orbit 42 are formed separately from the tank body 3, it is not necessary to weld the tank body 3 or the like, and safety is not impaired.

Further, in addition to the tank body 3 and the pedestal 2, the tie rod 5 can be inspected at the same time, and when a bend or the like is found,
You can take measures such as replacement.

Further, by appropriately forming and combining the sizes (lengths) of the work platforms 18, 19, 20 with each other, maintenance and inspection work can be carried out over the entire parts of the spherical tank below the equator B. For example, of the lower part from the equator B, the upper third can be shared by the third work platform 20, and the lower part can be shared by the first and second work platforms 18, 19. The structure is reasonable and extremely practical.

Further, since the scaffold portions 36, 47 are formed by the plate members 38, 46 that can move back and forth, workability is good.

Since the first work platform 18 is divided, it can be applied to tanks having different spherical radii (size of the tank main body 3) and is highly versatile.

If the drive device 26 and the traveling drive unit are provided with a brake device so that they are in a braking state during normal work and released during movement, safety in maintenance and inspection work is improved. Further, it is desirable that the operation panel is provided on the work platform 18, 19, 20 side to allow remote operation.

Further, the working unit of the present invention may be a temporary facility, or may be used from the time of construction to be permanently installed. Alternatively, for example, only the ring-shaped tracks 11 and 12 may be installed at all times to deal with the periodic inspection.

[Effects of the Invention] In short, according to the present invention, the following excellent effects are exhibited.

(1) An arc-shaped first work platform rotatably provided inside the pillar of the spherical tank along the meridian of the spherical tank and around the vertical axis of the spherical tank, and the spherical tank. Since it has a second work platform that is installed along the pedestal and is connected to the first work platform, a large-scale scaffold is not required, and maintenance and inspection work can be performed without impairing the safety of the tank. It can be carried out.

(2) Further, in the structure further provided with the third work platform hung so as to be able to travel from the traveling track provided in the corridor, in the maintenance / inspection work of the tank body outer surface, the pedestal and the tie rod below the corridor. Etc. can be done easily.

(3) Further, in the configuration in which the work platform has the scaffolding portion that can move back and forth, movement and maintenance inspection work can be performed smoothly and easily.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing an embodiment of a working unit for a spherical tank according to the present invention, FIG. 2 is a perspective view showing the essential parts thereof, and FIG. 3 is a front view thereof. FIG. 4 is a plan view showing a scaffold portion, FIG. 5 is a side view thereof, and FIG. 6 is a side view showing a conventional spherical tank and scaffold. In the figure, 18 is a first work platform, 19 is a second work platform, and 20 is a third work platform.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hachiro Inoue 2-2-1 Otemachi, Chiyoda-ku, Tokyo Ishi Kawashima Harima Heavy Industries Ltd. (72) Inventor Isao Nishiura 2--9 Yaesu, Chuo-ku, Tokyo No. 7 Ishikawajima Tank Construction Co., Ltd. (72) Inventor Akira Matsuoka 2-9-7 Yaesu, Chuo-ku, Tokyo Ishikawajima Tank Construction Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. An arc-shaped first work platform rotatably provided inside a pedestal of a spherical tank along a meridian of the spherical tank and around a vertical axis of the spherical tank, and the spherical shape. A work unit for a spherical tank, comprising a second work platform provided along the pedestal of the tank and connected to the first work platform. 2. An arc-shaped first work platform rotatably provided on an inner side of a pillar of the spherical tank along a meridian of the spherical tank and around a vertical axis of the spherical tank, and the spherical shape. Along the pedestal of the tank, along with the second work pedestal provided in connection with the first work pedestal and the traveling track provided in the corridor of the spherical tank, along the pedestal A working unit for a spherical tank, which is equipped with a suspended third working platform. 3. The spherical tank according to claim 1 or 2, wherein the second and third work platforms have scaffolding parts that retreat when the work platform orbits and travels in a substantially horizontal direction during work. Working unit.