JPS5916620B2 - Assembly method of spherical tank - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for assembling a spherical tank.

Conventionally, as shown in Fig. 1, the method of assembling this type of spherical tank is to construct a center ring by sequentially connecting central shell plates 7 with a plurality of footnotes 1' in the horizontal direction, and then to form a center ring. An upper ring is constructed by mounting an upper shell plate 4' having a plurality of struts 3' on its inner surface, and temporarily connecting this to a joint part from the inner surface of the upper end of the center ring using a strong bag 5'. After that, the top crown 6' was mounted and welded according to the conventional method, and before welding the lower shell plate, the above-mentioned support column 3' was removed and the lower shell plates were successively welded. In this way, the conventional assembly method requires a temporary support process using many columns to support the upper shell plate, and also requires temporary welding of strong bags to temporarily fix the joint parts of the center and upper shell plates. The process was complicated, and the construction period was relatively long, among other serious drawbacks.

The present invention has been made in view of the above-mentioned circumstances, and uses a simple yet rational means. Specifically, on the central shell plate constituting the center ring, on the inner and outer surfaces of the lower end edge, the central shell is provided. Place the upper shell plate on which the strong bags located in the middle of the adjacent strong bags temporarily welded to the plate are temporarily welded on the front and back sides, and place the upper edge of the center shell plate of the center ring on the front and back strong bags of the upper shell plate. Then, the lower ends of the upper shell plates are sandwiched and supported by the front and back strong bags of the center shell plate, and the upper shell plates are sequentially welded and connected laterally, and the upper shell plates and the center ring are welded to form the upper. The problems of the prior art are solved by constructing the ring and sequentially building the upper ring upward in this way,
The aim is to simplify the work, shorten the construction period, and promote lower construction costs.

To explain an embodiment of the construction method of the present invention with reference to the drawings, a plurality of strong bugs 3 are placed on the ground at appropriate intervals on the inner and outer surfaces of the upper edge of the central shell plate 2 to which the upper ends of the pillars 1 are fixed on both sides of the outer surface. The center ring A is constructed by attaching and welding the front and back alternately, and sequentially welding and connecting the center shell plates 2 in the lateral direction.

Reference numeral 4 denotes an upper shell plate connected to the upper end surface of the central shell plate 2, and on the inner and outer surfaces of the lower edge of the upper shell plate 4, there are attached intermediate parts between adjacent strong bags 3 temporarily welded to the central shell plate 2 on the ground. A plurality of strong bags 5 located in the section are temporarily fixed alternately on the front and back sides.

Then, as shown in FIG. 2, the upper shell plate 4 is placed above the center shell plate 2 that constitutes the center ring A that has already been formed, and the upper edge of the center shell plate 2 is attached to the front and back strong points of the upper shell plate 4. In step 5, the lower edge of the upper shell plate 4 is clamped and supported by the front and back strong bags 3 of the central shell plate 2, respectively, and in this state, the joints of both shell plates 2 and 4 are welded. The upper ring B is constructed by sequentially performing the steps in the lateral direction. Although not particularly shown, the upper ring B is constructed upward in this way, and the top crown is mounted and welded to the upper end of the uppermost ring by a conventional method. A spherical tank is obtained by constructing a down ring using the lower shell plate using conventional methods. In addition, the above strong bugs 3 and 5
It is to be removed at an appropriate time after the upper ring is constructed on the center ring, and it goes without saying that the time of removal is not specified.

3a and 5a are notches formed in the strong bags 3 and 5, and these notches allow the middle and upper shell plates 2
, 4 are opened, allowing complete welding of both plates.

As described above, according to the construction method of the present invention, unlike the conventional construction method shown in Fig. 1, there is no need to use a large number of pillars to prevent the upper shell from collapsing when installing the upper shell board, which simplifies the construction method and shortens the construction period. It has excellent features such as being able to be achieved by various means and having great economic effects.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the conventional construction method, FIG. 2 is an explanatory diagram of the construction method of the present invention, and FIG. 3 is a sectional view of a part of the same.

Claims (1)

[Claims] 1 Equipped with a plurality of pillars, and on the inner and outer surfaces of the upper edge,
The process of constructing a center ring by sequentially welding and connecting the center shell plates in the lateral direction by temporarily welding strong bags alternately on the front and back sides at appropriate intervals; An upper shell plate is placed on the inner and outer surfaces of the center ring by temporarily welding strong bags located in the middle of adjacent strong bags temporarily welded to the center shell plate, and the upper edge of the center shell plate of the center ring is placed on the inner and outer surfaces of the center ring. are sandwiched and supported by the front and back strong bags of the upper shell plate, and the lower end of the upper shell plate is supported by the front and back strong bags of the central shell plate, and the upper shell plates are sequentially welded and connected laterally, and the upper shell plate is The upper ring is constructed by welding the plate and the center ring, and the process of sequentially building the upper ring upward in this way, the process of mounting and welding the top crown on the uppermost ring using a conventional method, and the process of welding the top crown onto the uppermost ring using a conventional method. A method for assembling a spherical tank characterized by comprising a step of assembling a dowling with a lower shell plate below it by a conventional method, and a step of removing each of the temporarily welded strong bags.