JPS59141671A - Construction of double-shell tank - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing a double shell tank.

Conventionally, after the uppermost side plate of the inner tank was erected, the inner tank roof was constructed on top of the inner tank side plate, and the outer tank roof was attached via a support member that maintained a predetermined distance above the inner tank roof. After that, the roof and side panels of the inner and outer tanks were jacked up as one unit, and the construction was carried out sequentially from the upper to the lower tier of the inner and outer tank side panels until the final stage was constructed. In this case, a large-capacity jack is required to jack up the roof and side panels of the inner and outer tanks in one piece, and as the tank becomes larger, it is necessary to secure a huge amount of jacking equipment, which makes transportation and equipment maintenance difficult. However, if the inner tank side panels are assembled from the bottom to the top, the work will have to be done at height when assembling the upper tier of the side panels, resulting in poor working conditions. There were problems in that it was difficult to maintain the quality level and the K work was dangerous. In order to solve these problems, the present invention uses the jack-up method to assemble the inner tank side plates.
Assemble the outer tank roof on top of the inner tank roof that was attached to the inner tank side panels, and jack the outer tank roof at the same time as the inner tank side panels are assembled. The tank side plates are assembled in a stacked manner from the lower tier to the upper tier, the bottom cold insulation is constructed, and the inner tank bottom plate is assembled and attached thereon.

An embodiment of the present invention will be described with reference to the drawings. An outer tank bottom plate 2 is arranged and constructed on a tank foundation 1, and an outer tank side plate 3 is placed on top of the outer tank bottom plate 2.
The lowest stage of the tank is assembled and erected into a cylindrical shape, and an annular pearlite concrete 4 is cast along the inner circumference of this outer tank side plate 3.
An annular grate 5 is laid on top of this, a plurality of jacks 6 are set up on top of the annular plate 5, and a frame 8 is placed above the bottom cooler 7 partially constructed on the outer tank bottom plate 2 inside these. The plate member 9 of the inner tank bottom plate is temporarily placed through the plate member 9. Next, the roof assembly support column 10 is erected approximately at the center of the outer tank bottom plate 2, and the uppermost part of the inner tank side plate 11 is assembled on the annular plate 5 with the jack 6 surrounded, and is placed in a cylindrical shape. An inner tank roof 12 composed of roof bones and plates is supported by supports 10.
Assemble and install it while supporting it, and then attach the support member 13 on top
Assemble an outer tank roof 14 made up of roof bones and plates through the
The side plate of the inner tank and its roof, and the uppermost side plate of the outer tank and the roof thereon can be jacked up integrally with a jack 6. Next, the support column 10 is removed, a construction opening 15 is opened in the outer tank side plate 3, and the inner tank side plate 11 is assembled from the upper layer to the lower layer using the Jasokiap construction method, and the inner tank side plate 11 is assembled from the upper layer to the lower layer using the Jasokiapu construction method. In accordance with the assembly of the side plates 11, the outer tank side plates 3 are assembled in a stacked manner from the lower stage to the upper stage.

In parallel with the assembly of these inner and outer tank side plates, the bottom cold insulating layer 7 was completely constructed, and the pedestal 8 was assembled on top of the cold insulating layer 7, and the plate members 9 that had been temporarily placed were arranged on the pedestal 8 and inside. Tank bottom plate 1
Assemble 6 and remove pedestal 8. At the same time, the inner tank bottom plate 16
lower it onto the cold insulation layer 7 and install it. On the other hand, when the assembly of the outer tank side plate 3 is completed around the same time as the assembly of the inner tank side plate 11 is completed, the lower end of the uppermost row of the outer tank side board that has been raised together with the outer tank roof 14 and the upper end of the row immediately below it are At the same time as welding and joining, the jack 6 is removed.

Finally, pressure resistance and airtightness tests of the inner tank, necessary cold storage, and construction opening 15
The process is completed by closing the tank, performing an airtight test on the outer tank, etc. In this embodiment, the outer tank side plates 3 are initially assembled to the first stage, but they can also be assembled to the second or third stage as long as it does not interfere with subsequent construction work. Inner tank side plate 11
The same can be said for . When assembling the inner tank side plate 11, install the construction opening 15 on a movable rail placed on a plurality of roller blocks arranged above the annular plate 5.
Construction can be carried out smoothly by placing the plate member of the inner tank side plate 11 taken in from the tank and moving it to a predetermined position. As for the task of assembling the outer tank roof on the inner tank roof, the procedure is the same as in the previous embodiment, and the inner tank side panels, inner tank roof, and outer tank roof are lifted up as one piece using the jack K, and the outer tank side panels are assembled. It is also possible to assemble the top tier in the same way as the other outer tank side panels, and then to join the outer tank roof and outer tank side panels when this top tier reaches the outer tank roof ridge. In this case, the load applied to the sliding jack is lighter by the amount of the uppermost layer of the outer tank side plate than in the case of the above embodiment.

According to the present invention, the outer tank side panels are constructed using a stacking method, and the inner tank side panels are constructed using the jack-up construction method, thereby reducing the construction period. Since the outer tank side panels are low, the plate members of the inner tank bottom plate are temporarily placed on the partial bottom cold insulation layer in the storage tank, so the outer tank side panels are assembled in parallel with the assembly of the inner and outer tank side panels. The inner tank bottom plate can be assembled easily and smoothly.When the inner tank side panels are low, the inner tank roof is assembled on top of the inner tank side panels that are in a low position, and the outer tank roof is assembled on top of that. Assembling can be done easily and safely at a low position by covering the upper part with the outer tank roof and the uppermost side plate of the outer tank, and then jacking up the inner tank side plate.
Since the bottom cold insulation and inner tank bottom plate are assembled, these operations can be carried out safely without being adversely affected by weather conditions such as wind and rain. Compared to the method of assembling the inner tank side plates in a stacked manner, higher quality is required. The side plates of the inner tank are assembled and welded at a low position from beginning to end using the Janokianopue method, which has remarkable effects such as being safe and of good quality.

[Brief explanation of drawings]

1 to 5 are longitudinal cross-sectional views for explaining embodiments of the present invention. The symbols in the figure indicate the following parts. l...Tank foundation, 2...Outer tank bottom plate, 3...Outer tank side plate, 3'...Top tier, 4...Pearlite concrete, 5...Anisler plate, 6... Jack, 7... Bottom cold insulation layer, 8... Frame, 9... Plate member, 10... Support column, 11... Inner tank side plate, 12... Inner tank roof, 13... Support Member, l4...outer tank roof, 1
5... Construction opening, 16... Inner tank bottom plate

Claims (1)

[Claims] The bottom layer of the outer tank side plate and the top layer of the inner tank side plate are assembled, and after temporarily placing the plate members of the inner oak bottom plate on the partially constructed bottom cold insulation layer, the inner tank is placed on top of the inner tank side plate. Assemble and attach the roof, assemble the outer tank roof on top of the inner tank roof via a supporting member, attach the top layer of the outer tank side plate under the outer tank roof, and connect the inner tank roof, the outer tank roof, and the inner tank. The inner tank side plates are assembled using the jack-up method from the upper tier to the lower tier by jacking them up using jacks placed on the side plates and metal inner tank annular plates, and the outer tank side plates are stacked from the lower tier to the upper tier in parallel with kneading. ``A method for constructing a double shell tank, which comprises: assembling the tank, constructing the bottom cold insulation, arranging the temporarily placed plate members, and assembling and attaching the inner tank bottom plate;