JPS5952269B2 - Roof assembly method for flat and low cylindrical tanks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roof assembly method for constructing the roof of a flat-bottomed cylindrical tank in blocks, and in particular, a work frame for roof assembly is assembled in a predetermined fan-shaped area, and a fan-shaped roof is constructed on the frame. This relates to a construction method that can efficiently assemble roofs by sequentially pivoting them in the circumferential direction and constructing adjacent roofs one after another.

Conventionally, when assembling the roof of a flat-bottomed cylindrical tank, as the tank becomes larger, after the bottom plate is installed, the ground assembly is performed on the bottom plate from the viewpoint of work maintenance, etc., and then it is floated using air pressure etc. installed in position.

For example, in the case of a flat-bottomed cylindrical tank 2 having a spherical roof 1 as shown in FIG. Then, the roof aggregate 5 is sequentially applied to the entire surface using cargo handling equipment such as a crane 6, and then the roof is assembled by placing the roof shingles 6 on the entire surface in the same manner, or alternatively, the roof is assembled in a factory or a temporary factory on site. Generally, blocks were assembled, then welded and inspected. However, this method of roof assembly via ground assembly of flat-bottomed cylindrical tanks requires a large-scale work scaffold using construction equipment over the entire bottom plate, and the work of assembling and removing it is cumbersome. Not only does this lengthen the construction period, but it also has the disadvantage of requiring equipment such as frames, and it is not easy to carry in, arrange, or move welding machines and equipment for construction inspection, and it is difficult to carry in materials for each installation. It has the disadvantage of requiring large-scale construction work such as moving cranes and other equipment to new locations, making it difficult to adequately manage construction safety and work, and making it difficult to ensure quality control.

The purpose of the present invention is to eliminate the above-mentioned drawbacks in view of the problems of the roof assembly method for a flat-bottomed cylindrical tank based on the prior art, and to
Not only can the difficulties be solved and the disadvantages eliminated, but the process of assembling a work frame in a predetermined fan-shaped area and rotating it to sequentially assemble and form adjacent fan-shaped roofs can be repeated at least once. In this way, the fan-shaped roof supports the center and the peripheral edge, or the member stands on its own without buckling by simply supporting both sides of the peripheral edge, and the roof is axially symmetrical around the center of the tank. Taking advantage of this fact, it is possible to arrange work frame equipment in a certain fan-shaped area, to assemble a certain section of the roof in that work area, and to move the appropriate position of the roof section in the circumferential direction after the related work is completed. The basic concept is that the roof is moved in the circumferential direction while supported by a small trolley, and the roofs of adjacent sections are sequentially assembled on the roof of the certain section, and then the roof is rotated to reach the work platform area. We provide a method for assembling the roof of a flat-bottom cylindrical tank, the gist of which is to assemble the roof of a flat-bottomed cylindrical tank in a continuous manner by performing preliminary work such as pre-assembly, finishing such as welding, and post-stage work such as inspection. That is. An embodiment of the present invention that achieves the above object will be described below with reference to the drawings from FIG. 2 onwards.

A bottom plate 7 is installed on a predetermined foundation, and a work platform 8 for forming a roof is assembled in a predetermined fan-shaped area on the bottom plate 7. Then the 8th
As shown in the figure, roof aggregate 10 is transported through cargo handling equipment such as a crane 9.
is hung into the area a of the frame 8 that will be involved in the assembly work, and then the roof plates 11 are similarly hung to assemble the roof 12 of a predetermined section into a fan shape, and welding or the like is performed.

The roof 12 formed into a fan shape as described above has the roofs 9a to 9.
The tank is rotated in the circumferential direction via a circumferential rotation movement means as shown in Fig. e.

The turning movement means moves the fan-shaped roof 12 by a small moving trolley 14 provided on the upper part of the center support 13 on the main part side.
On the peripheral side, the inner circumference of the side plate 15 or the top of the bottom plate 7, or
A self-blade on the guideway 17 provided on the pillar 16, or
It is supported by a cart 18 which is driven by other power. Through the above means, the fan-shaped roof 12 is moved to the work area b for the next step of the pedestal 8, and detailed welding work, finishing work, etc. are carried out, while the adjacent assembly work is carried out. Roof aggregate 10 and roof shingles 1 are prepared in the same manner as described above in the arbor area a.
1 and assemble the fan-shaped roof 312, and move to the work area b.
It joins with the roof 12 that has been moved to.

After the work in the work areas A and B is completed, the fan-shaped roofs 12 and 12 in the work areas A and B are moved to the adjacent work areas B and C, respectively, via the moving means, and in the work area C, for example, welding inspection is carried out. In other work areas A and b, predetermined work is carried out as described above.

That is, the fan-shaped roof members assembled in the assembly work area a are sequentially moved to the welding work area b and the inspection work area C to form a predetermined assembly, and the successive fan-shaped roof members are sequentially joined to form the entire roof of the tank. form.

Further, while the roof is being formed, the side panels 15 other than the peripheral surface facing the assembly work area a, which is the entrance path for the roof members, are gradually assembled and formed.

Then, the roof formed on the entire surface is raised via an appropriate machining mechanism or the like and attached onto the side plate 15.

Further, as the support for the fan-shaped roof 12, 13a to 13C
As shown in the figure, select the peripheral area, central area, arbitrary points, etc., combine them according to the design, and install appropriate roads such as rails and moving carts. In addition to the above example, it is also possible to construct the roof of a double shell flat bottom cylindrical tank using the above process. In that case, the outer tank roof may be constructed first, or the inner and outer tank roofs may be constructed. It may be assembled in one piece.

Moreover, it can be used not only for dome-shaped roofs but also for flat roofs. As described above, according to the present invention, when the roof assembly method of a flat-bottomed cylindrical tank involves block construction, a frame is assembled and formed in a predetermined sector angle area on the bottom plate or foundation of the cylindrical tank, and the frame is mounted on the frame. The process is carried out by assembling and forming a predetermined fan-shaped roof, moving it circumferentially, and assembling the next adjacent fan-shaped roof on the pedestal so as to connect it to the previous fan-shaped roof. By repeating the process at least once, it is only necessary to form a frame on a part of the tank, making it a small-scale work.Also, since the work position for welding etc. is constant, work equipment etc. This eliminates the need to move the parts, making work more efficient. Also, each assembly, welding, inspection work, etc. can be divided into separate areas and placed on a line, which has the advantage of continuous work. Since it is only necessary to carry out cargo handling using a crane, etc., it is possible to safely continue working at other parts even while the crane is working.

Therefore, it is possible to perform work with extremely high efficiency, and has the advantage of shortening the construction period.In addition, it is possible to feed back the quality results of the previous process in each assembly, welding, inspection, etc., and use it for the work in the next process. It is possible to reflect this, it is easy to perform quality control, and quality can be stabilized.

In the above embodiment, the frame is placed in one place, but depending on the construction circumstances, it may be installed in multiple places to form the roof in multiple areas. For example, the center support may be narrowed to create a symmetrical structure. In that case, a separate work area may be provided for each frame.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a tank roof construction method based on the prior art, Fig. 2 and the following drawings show an embodiment of the present invention, Fig. 2 is a plan explanatory diagram, and Figs. 3 and 4. is a side explanatory view, figures 5 and 6 are plan explanatory views, and figures 7, 8, 10, and 11.
, 12 are perspective explanatory diagrams of the construction process, Figures 9a to 9e are explanatory diagrams of the means for rotating the fan-shaped roof, and Figures 13a
Figures 13C to 13C are explanatory diagrams of support points of a fan-shaped roof. 6,12... Roof, 10... Frame, 1
2...Fan-shaped roof.

Claims (1)

[Claims] 1. In a roof assembly method for a flat-bottomed cylindrical tank that involves block construction, a pedestal is assembled in a predetermined fan-shaped area of the cylindrical tank, a predetermined approximately fan-shaped roof is assembled and formed on the mount, and the formed fan-shaped roof is moved in the circumferential direction. It is characterized in that the next fan-shaped roof adjacent to the rotating roof is assembled and connected on the pedestal, and the process of assembling and connecting the adjacent roofs is repeated at least once. Roof assembly method for flat bottom cylindrical tank.