JPS6337229B2 - - Google Patents

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 is erected, the inner tank roof is constructed on the inner tank side plate, and the outer tank roof is attached to the inner tank roof via supporting members that maintain a predetermined interval. Previously, the roof and side panels of the inner and outer tanks were jacked up in one piece, and the inner and outer tank side panels were built sequentially from the top to the bottom using the jack-up method until the final stage. In this case, large-capacity jacks are required to jack up the roofs and side plates of the inner and outer tanks in one piece, and if the tank becomes large, a huge amount of jacking equipment must be secured, which costs a lot of money in terms of transportation and equipment maintenance. However, if the inner tank side panels are assembled in a stacked manner from the lower tier to the upper tier, work will be done at height when assembling the upper tier of the side panels, which will worsen the working conditions, so the quality level for the inner tank that requires high quality will be lower. There were problems in that it was difficult to maintain and the work was dangerous. In order to solve these problems, the present invention assembles the inner tank side plates using the jack-up method, and assembles the outer tank roof on top of the inner tank roof attached to the inner tank side plates. When jacking up the side panels, the outer tank roof is also jacked up at the same time, and in parallel with the assembly of the inner tank side panels, the outer tank side panels are assembled in a stacked manner from the bottom to the top, and the bottom cold insulation is installed and the inner tank bottom plate is installed on top of it. It is characterized by assembly and installation.

An embodiment of the present invention will be described with reference to the drawings. The outer tank bottom plate 2 is arranged and constructed on the tank foundation 1, and the lowermost stage of the outer tank side plate 3 is assembled and erected in a cylindrical shape on top of the outer tank bottom plate 2. An annular pearlite concrete 4 is cast along the inner circumference of the tank side plate 3, and an annular plate 5 is laid on top of this.
A plurality of jacks 6 are erected on the top, and a bottom cold insulation 7 is partially constructed on the outer tank bottom plate 2 inside these jacks.
A plate member 9 of the inner tank bottom plate is temporarily placed above the tank via a pedestal 8. Next, a 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 and erected in a cylindrical shape on the annular plate 5 surrounding the jack 6. The inner tank roof 12 made of roof bones and plates is assembled and attached while being supported by the pillars 10, and the outer tank roof 14 made of roof bones and plates is assembled thereon via the supporting members 13. The uppermost stage 3' of the outer tank side plate is connected to the lower end, so that the side plate of the inner tank and its roof, and the uppermost stage of the outer tank side plate and the roof thereon can be jacked up integrally with a jack 6. Next, the pillar 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 jack-up method while using this opening for carrying in and out of parts. In accordance with the assembly of step 11, the outer tank side plates 3 are assembled in a sequential 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 is constructed on the entire surface, a pedestal 8 is assembled on top of the cold insulating layer 7, and the temporarily placed plate members 9 are arranged on the pedestal 8. The tank bottom plate 16 is assembled, the pedestal 8 is removed, and the inner tank bottom plate 16 is lowered onto the cold insulation layer 7 and attached. On the other hand, the inner tank side plate 11
When the assembly of the outer tank side plate 3 is completed at the same time as the assembly of the outer tank roof 14 is completed, the lower end of the uppermost stage of the outer tank side plate which has been jacked up together with the outer tank roof 14 is welded and joined to the upper end of the stage immediately below it. At the same time, the jack 6 is removed.

Finally, the pressure resistance and airtightness tests of the inner tank, necessary cold storage, closing of the construction opening 15, and airtightness tests of the outer tank are completed. In this embodiment, the outer tank side plate 3 is first
Although it is supposed to be assembled up to the first stage, it is also possible to assemble up to the second or third stage as long as it does not interfere with subsequent construction. The same can be said about the inner tank side plate 11. When assembling the inner tank side plate 11, the plate members of the inner tank side plate 11 taken in from the construction opening 15 are placed on a moving rail placed on a plurality of roller blocks arranged on the annular plate 5, and then placed in a predetermined position. Construction can be carried out smoothly by moving to In addition, the outer tank roof is assembled on the inner tank roof in the same manner as in the previous embodiment, and only the inner tank side panels, inner tank roof, and outer tank roof are jacked up integrally. It is also possible to assemble the top layer of the side panels in the same way as the other outer tank side panels, and then to connect the outer tank roof and the outer tank side panels when the top layer reaches the outer tank roof. In this case, the load applied to the 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 in parallel by the stacking method, and the inner tank side panels are constructed using the jack-up method, thereby shortening the construction period. It can be made smaller because it does not need to be supported. When the outer tank side panels are low, the plate members of the inner tank bottom plate can be temporarily placed on the partial bottom cold insulation layer in the storage tank, making it easy to assemble the inner and outer tank side panels. The inner tank bottom plate can be assembled smoothly during periods when the inner and outer tank side plates are at a low position.The inner tank roof is assembled on top of the inner tank side plates that are in a low position, and the outer tank roof is assembled on top of that, making it easy to assemble the roof. After covering the top with the outer tank roof and the top side plate of the outer tank, which can be done easily and safely at a low position, the inner tank side plate is assembled using the jack-up method, the bottom is kept cool, and the inner tank bottom plate is assembled, so these operations are protected from wind and rain. Compared to the method of assembling the inner tank side panels in a stacked manner, which can proceed safely without being adversely affected by weather conditions such as This process has remarkable effects, such as being safe and producing products 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. 1...Tank foundation, 2...Outer tank bottom plate, 3...Outer tank side plate, 3'...Top tier, 4...Perlite concrete, 5...Annual plate, 6...Jacket, 7...Bottom cold insulation Layer, 8... Frame, 9...
Plate member, 10... Support, 11... Inner tank side plate, 12
...Inner tank roof, 13...Supporting member, 14...Outer tank roof, 15...Construction opening, 16...Inner tank bottom plate.

Claims (1)

[Claims] 1. After assembling the bottom layer of the outer tank side plate and the top layer of the inner tank side plate, and temporarily placing the plate members of the inner tank bottom plate on the partially constructed bottom cold insulation layer, install the inner tank roof on top of the inner tank side plate. Assemble and install the outer tank roof on top of the inner tank roof via a support member, install 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 side plate. The inner tank side plates are assembled from the upper tier to the lower tier using the jack-up method by jacking them up using jacks placed on the inner tank annual plate, and in parallel, the outer tank side plates are assembled from the lower tier to the upper tier using the stacking method. A method for constructing a double shell tank, which comprises constructing a bottom cold insulation structure, arranging the temporarily placed plate members, and assembling and attaching an inner tank bottom plate.