JPH0233821B2 - ENTOKEITANKUNOSHUHEKIKUMITATEHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a diameter of 30 mm as illustrated in FIG.
The present invention relates to a method of assembling a large cylindrical tank made of steel plate for storing liquids, gases, etc., with a height of ~100 m and a height of 15 to 25 m, and in particular, a method of assembling its peripheral wall.

Conventionally, the method of assembling large cylindrical tanks made of steel plates involves first laying a bottom plate on the foundation, and then stacking surrounding wall members around the bottom plate in order from the bottom of the surrounding wall in the same manner as bricklaying. There is a method called the pile construction method, and a method commonly called the helical construction method or spiral construction method, in which the peripheral wall is assembled by winding it up from the bottom to the top in the same manner as a spiral steel pipe.

By the way, the former bricklaying method is one in which the peripheral wall portion of the tank body is divided into segment-shaped peripheral wall members of a certain size, and the peripheral wall members are stacked one by one from the bottom and assembled by welding.
However, according to this assembly method, as the assembly work progresses, the work must be done at high places all around the circumference, which inevitably reduces the safety and efficiency of the work. In particular, since the peripheral wall members are made of brickwork, the welded portions of each peripheral wall member are difficult to adapt to automatic welding and have to be manually welded.

In addition, the latter helical construction method or spiral construction method requires less work at heights than the former, and the surrounding wall components can be supplied at a low location and in a fixed location, improving the safety and efficiency of the assembly work. It is said to have excellent sex. However, since this method involves assembling the entire peripheral wall with a type of spiral steel pipe structure, there is a problem in cutting the peripheral wall members.

In any case, each of the conventional methods has its advantages and disadvantages, and further improvements are required in terms of safety, workability, and in particular improvement in quality and work efficiency through the application of automatic welding.

The method of the present invention was developed in response to these demands, and takes into account the advantages and disadvantages of conventional construction methods, and in particular facilitates the application of automatic welding work, and is compatible with rotary construction methods as well as brick masonry construction methods, helical construction methods, and spiral construction methods. It provides a new way to say things.

The feature of this method is that first, a peripheral wall corresponding to the lowermost stage of the cylindrical peripheral wall is assembled, and rollers are placed above the upper edge of the lowermost peripheral wall to support the upper peripheral wall at regular intervals. The peripheral wall members of the upper stage are stacked and welded on the rollers.
The circumferential wall portion that has been stacked and welded is moved in the circumferential direction using the roller, and then additional circumferential wall members are stacked and welded to assemble the entire circumferential wall portion of the upper stage at a fixed location, and then the roller The lowermost peripheral wall and the upper peripheral wall are assembled into an integrated cylindrical peripheral wall.

Further, to explain this in detail based on an example, as shown in FIG. 2, first, the peripheral wall portion 1 corresponding to the lowermost stage of the peripheral wall portions is assembled. Reference numeral 2 denotes a segment-shaped peripheral wall portion constituting the peripheral wall portion of each stage.

Next, supporting rollers 4 are placed above the upper edge 3 of the lowermost peripheral wall portion 1 at regular intervals.

Then, as shown in FIG. 3, the peripheral wall portions 5, 5, . . . of the upper stage are stacked and assembled on the rollers 4, 4, .

That is, as shown in Figures 3 and 4, the crane 6
etc., to suspend the peripheral wall member 2 and assemble it on the rollers 4, 4, . . . .

In addition, in Figures 3 and 4 and Figures 5 and 6, 7
is a scaffold for suspending and assembling the peripheral wall member 2, and is erected in the range of 1/8 to 1/9 of the total length of the peripheral wall to be assembled.

Next, as shown in Figure 3 and Figures 4 and 5, when the assembly of a part of the upper stage peripheral wall (1/8 to 1/9 of the total peripheral wall length) is completed on the rollers 4, 4... The assembled peripheral wall portion 5 is moved in the circumferential direction (in the direction of the arrow) using the rollers 4, 4, . Thereafter, in this manner, the peripheral wall portions 5, 5, . . . of the upper stage are sequentially stacked and assembled and welded. That is, the peripheral wall portion that has been assembled on the rollers 4, 4... is moved using the rollers 4, 4..., and after that movement, the surrounding wall member 2 is hung in order, and the assembly process is performed from carrying in the surrounding wall member to assembly in the assembly work. The unique feature is that the process of finding and welding is carried out at a fixed location.

When the assembly of all the upper stage peripheral wall parts 5 on the rollers 4, 4... is completed, the rollers 4, 4... supporting the upper stage peripheral wall part 5 are removed, and the lowermost stage peripheral wall part 1 and the lowermost stage peripheral wall part 1 are removed. , and the peripheral wall portion 5 of the upper stage are integrally welded to complete the assembly of the entire peripheral wall portion.

Now, as described above, the method for assembling the peripheral wall according to the present invention includes the second and higher stages of the peripheral wall 5', 5'', 5...
This is a method in which the peripheral wall members 2 are sequentially stacked and assembled on top of the lowermost peripheral wall part 1 while rotating, and the series of operations from carrying in the peripheral wall members 2 to assembly and welding are carried out in a certain limited place. , has the following advantages:

(1) The work of transporting, assembling, and welding surrounding wall members can be carried out in a limited fixed location, so it can be handled even if there are restrictions on the tank construction location.

For example, according to the bricklaying method, it is necessary to secure a considerable working yard around the entire outer circumference of the tank to be constructed, but this work can be done within a limited outer circumferential area.

(2) In addition, if there is a tank storing flammable hazardous materials in an adjacent location, fire prevention measures will be required because the assembly involves the use of fire, but as mentioned above, the work area is limited, so Effective fire prevention measures can be taken by enclosing only a portion of the work scaffold 7 shown in FIG. 5 with a fire prevention sheet or the like.

(3) Assembling and welding of peripheral wall members is done in a limited area, and the welds are horizontal welds in the circumferential direction and vertical welds in the longitudinal direction, so automatic welding is easy; for example, as shown in Figure 5 and As shown in FIG. 6, the automatic welding device 8 can be assembled into a work scaffold to perform efficient welding.

Furthermore, as shown in Fig. 5, if a sheet or roof 9 is attached to the work scaffold 7 to prevent wind and rain, welding work can be carried out regardless of the weather, and not only process control but also welding work management can be carried out. , can produce high quality products.

(4) Furthermore, in the conventional bricklaying method,
It was necessary to temporarily set up scaffolding for assembly work on the peripheral wall of the main body, and remove the scaffolding bracket after the work was completed, but since this is not necessary, the construction period can be shortened.

Furthermore, the inspection of the welded portion of the upper peripheral wall 5 can be carried out during the assembly process using a traveling gondola 10 mounted on the assembled peripheral wall as shown in FIG.

As described above, according to the assembly method of the present invention, a series of operations such as carrying in parts, assembly, and welding can be carried out in a limited place, and it is easy to secure a work yard, which is a problem in assembly operations. Automatic welding can be applied, which not only improves work efficiency but also improves product quality, and is significantly more effective than conventional assembly methods.

[Brief explanation of drawings]

Figure 1 is a front view of a cylindrical steel tank to which the assembly method of the present invention is applied, Figures 2 and 4 show the method based on the assembly order, and Figure 2 shows how to assemble the lowermost peripheral wall and , with rollers placed on its upper edge, Figure 3 shows a state in which the upper peripheral wall member is suspended and assembled onto the roller using a crane, and Figure 4 shows the same upper stage peripheral wall member suspended and assembled. They each indicate the status. Figure 5 is a front view showing details of the assembled scaffolding part;
FIG. 6 is a longitudinal sectional view taken along the line XX in FIG. 5. 1... Lowermost peripheral wall portion, 2... Peripheral wall member, 3...
Upper edge, 4... Support roller, 5... Upper peripheral wall portion, 6... Crane, 7... Working scaffold, 8... Automatic welding device, 9... Temporary roof, 10... Traveling gondola.

Claims (1)

[Claims] 1. In a cylindrical tank in which a cylindrical peripheral wall is formed by stacking and joining segment-shaped peripheral wall members in multiple stages, the lowest stage peripheral wall is assembled first, and the upper stage peripheral wall parts are placed at regular intervals above the upper edge of the peripheral wall. The peripheral wall members of the upper stage are stacked and welded on the rollers, and the peripheral wall parts that have been stacked and welded are moved in the circumferential direction using the rollers, and then the peripheral wall members are moved. A cylindrical tank characterized in that the upper stage peripheral wall is assembled at a certain location by welding and stacking, and then the roller is removed, and the lowermost stage peripheral wall and the upper stage peripheral wall are assembled into an integral cylindrical peripheral wall. How to assemble the surrounding wall.