JPS6355590B2 - - Google Patents

Description

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

Conventionally, after the uppermost side plate of the inner tank is erected, an inner tank roof is constructed on the inner tank side plate, and the outer tank roof is arranged on top of the inner tank roof at a predetermined distance via supporting members. Previously, the roof and side panels of the inner and outer tanks were jacked up in one piece, and the construction was carried out sequentially from the top of the inner and outer tank side panels to the final stage using the jack-up method. In this case, large-capacity jacks are required to jack up the roof and side panels of the inner and outer tanks in one piece, and as the storage tank becomes larger, it is necessary to secure a huge amount of jacking equipment, which is difficult from the point of view of transportation and equipment maintenance. The problem was that it required a lot of money.

The present invention aims to solve this conventional problem by constructing the side panels of the outer tank in a stacked manner from the bottom to the top, while the side panels of the inner tank are constructed sequentially from the top to the bottom using the jack-up method. A lift up mechanism that suspends one or both of the inner tank roof assembled on the upper end of the tank side plate and the outer tank roof assembled on the roof at a lower stage during the assembly of the tank side plate from the upper end of the outer tank side plate. The feature is that the roof is attached to the upper end of the side plate by lifting it up with a lever.

Embodiments of the present invention will be explained sequentially with reference to the drawings. (1) Arrange the members of the outer tank bottom plate 1 on the foundation, assemble the entire outer tank bottom plate 1, and then install the first stage of the outer tank side plate 2 on top of it. are assembled into a cylindrical shape and welded to the bottom plate 1, and annular pearlite concrete 3 is cast along the inner circumference of the side plate 2.

(2) An annular plate 5 is laid on the solidified pearlite concrete 3, a plurality of jacks 6 are placed on it at appropriate intervals, and partial bottom cooling insulation 7 is installed at appropriate locations inside the pearlite concrete 3. Construction is carried out, and a plate member 9 for the inner tank bottom plate is temporarily placed thereon via a base plate 8 for assembling the bottom plate.

(3) Assemble the upper first stage of the inner tank side plate 4 on the outer annular plate 5 of the jack 6 in a cylindrical shape, attach the knuckle plate 10 thereon, and place the temporary roof support 11 on the outer tank bottom plate 1. While supporting the inner tank roof, the aggregates of the inner tank roof are assembled and the plates of the inner tank roof 12 are arranged and attached thereon, and the outer tank roof bones and the outer tank roof 13 are placed on the inner tank roof 12. In parallel with these, the outer tank side plates 2 are constructed in a stacked manner from the lower tier to the upper tier, and are assembled to the top tier.
At this time, a construction opening 14 is provided at the lower part of the outer tank side plate.

(4) Next, use a plurality of lift-up jacks 15 suspended from the upper end of the outer tank side plate 2 to lift the outer tank roof frame and plate, attach them to the upper end of the outer tank side plate 2, and install the temporary roof supports 11. At the same time as removing it, or after that, assemble the second and subsequent stages from the upper stage of the inner tank side plate 4 sequentially from the upper stage to the lower stage using jacks 6, and in parallel with this, or after completing the installation of the outer tank roof 13, the bottom cooling insulation 7 is installed. The inner tank bottom plate 16 is assembled by arranging the plate members of the inner tank bottom plate on the bottom cooler 7 via the bottom plate assembly frame 8 and welding both sides of the inner tank bottom plate 16.

(5) Furthermore, the inner tank bottom plate 16 is lowered onto the bottom cooler 7, and the pedestal 8 and jack 6 are removed.

After that, pressure resistance and airtightness test of the inner tank, construction opening 14
The project is completed by closing the tank, testing the airtightness of the outer tank, and insulating the inner and outer tanks.

Another embodiment of the present invention will be described with reference to FIGS. 6 and 7. (1) and (2) in the description of the above embodiment
The method described in 1. is used as is, and the following methods (3') and (4') are used corresponding to the contents described in (3) and (4) of the above embodiment.

(3') Assemble the first stage of the upper part of the inner tank side plate into a cylindrical shape on the outer annular plate 5 of the jack 6.
While supported by temporary struts 11 erected on the outer tank bottom plate 1, the nutcle plate 10 and the inner tank roof frame are assembled on the inner tank side plate 4 so that they are flush with each other, and the inner tank roof 12 is placed on the roof frame. The lower end of the plate of the roof 12 and the upper end of the knuckle plate 10 are connected by welding, and the outer tank roof frame is assembled on the inner tank roof 12 via the support member 17, The plate members of the outer tank roof 13 are placed and arranged and assembled at an appropriate time. In this case, the lower end of the knuckle plate 10 and the inner tank side plate 4
Only the skin is aligned with the upper end and no welding is performed. On the other hand, in parallel with these or after the arrangement of the outer tank roof plates is completed, the outer tank side plates 2 are constructed by a sequential stacking method from the lower tier to the upper tier, and are assembled up to the top tier. At this time, a construction opening 14 is provided under the outer tank side plate 2 and is used for carrying in and out of parts, equipment, etc.

(4') Next, the outer tank roof 13 and the inner tank roof 12 with the knuckle plate 10 attached are integrally lifted up using a plurality of lift-up jacks 15 suspended from the upper end of the outer tank side plate 2. Attach the tank roof 13 to the upper end of the inner tank side plate 2 and remove the temporary support 11, or after that, assemble the inner tank side plates 4 sequentially from the upper layer to the lower layer using the jack-up method using jacks 6 to remove the previously lifted inner tank. When the upper end of the inner tank side plate 4 reaches the lower end of the knuckle plate 10 attached to the roof 12, they are welded together and joined together.
The inner tank bottom plate 16 is assembled on the entire surface by arranging the plate members of the inner tank bottom plate 16 on the bottom cold insulation 7 via the bottom plate assembly frame 8.

After that, it was described in the explanation of the above example.
Complete in the same way as (5).

In either embodiment, the outer tank side plate 2 is
Although it is supposed to be assembled up to the first stage, it is also possible to assemble up to two or three stages. In short, the height may be sufficient as long as it does not interfere with subsequent construction. The same can be said for the initial assembly of the inner tank side plate 4. When assembling the inner tank side plate 4, the plate members of the inner tank side plate 4 taken in from the construction opening 14 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 the position shown below.

According to the present invention, the outer tank side panels are assembled using a stacking method, and the inner tank side panels are assembled using the jack-up construction method, so the jacks for jacking up do not need to bear the weight of the outer tank roof, and a small jack is sufficient. When the outer tank side panels are at the 1st or 2nd stage, the plate members of the inner tank bottom plate are temporarily placed on top of the partially cooled bottom of the storage tank, so the inner and outer tank side panels and roofs are assembled. It is convenient to assemble the inner tank bottom plate later, when the outer tank side plate is low, the inner tank roof and the outer tank roof are assembled on top of the top layer of the inner tank side plate, and the outer tank side plate is assembled. After assembling up to the upper level, the outer tank roof can be lifted up and installed using a lift-up jack suspended from the upper level of the side plate, so the outer tank roof can be installed safely and efficiently. Since the construction is carried out on a regular basis, delays in construction due to weather such as rain can be prevented, and by installing the outer tank roof early, the subsequent construction of the inner tank side panels using the jack-up method can proceed safely without being affected by the weather. Since the plate members of the inner tank bottom plate are temporarily placed inside in advance, the arrangement of the inner tank bottom plate can be smoothly performed in parallel with the assembly of the inner tank side plates, which shortens the construction period.The inner tank side plates can be stacked. Compared to the conventional assembly method, the inner tank side plate, which comes into contact with the low-temperature contents, is assembled and welded at a lower position from beginning to end using the jack-up method, which has remarkable effects such as being safe and producing products of good quality.

[Brief explanation of the drawing]

1 to 5 are longitudinal cross-sectional views for explaining one embodiment of the present invention, and FIGS. 6 and 7 are longitudinal cross-sectional views for explaining other embodiments of the present invention. The symbols in the figure indicate the following parts. 1... Outer tank bottom plate, 2... Outer tank side plate, 3... Perlite concrete, 4... Inner tank side plate, 5... Annular plate, 6... Jacket, 7... Bottom cold insulation, 8... Frame, 9...Plate member, 10...Natsukuru plate, 11...Temporary support, 12...Inner tank roof, 13...Outer tank roof, 14...Construction opening, 15
... Lift up jack, 16 ... Inner tank bottom plate,
17...Supporting member.

Claims (1)

[Scope of Claims] 1. When the outer tank side plates are assembled in a stacked manner from the lower layer to the upper layer on the outer tank bottom plate assembled on the foundation, and the height of the outer tank side plates is as low as the first or second layer. After constructing partial bottom cooling, temporarily placing the plate members of the inner tank bottom plate above it, and installing the uppermost inner tank side plate and inner tank roof assembled in a cylindrical shape on the inner tank annular plate. The outer tank roof is assembled and placed on top of the inner tank roof, and when the outer tank side panels have been assembled to the top level, they are installed using multiple lift-up jacks suspended from the top of the outer tank side panels. Then lift the outer tank roof and attach it to the upper end of the outer tank side plate, and assemble the inner tank side plate from the upper to the lower layer using the jack-up method using multiple jacks set up on the annular plate inside the inner tank. A method for constructing a double-shell storage tank, characterized in that the inner tank bottom plate is assembled by complete construction and by arranging the temporarily placed plate members of the inner tank bottom plate. 2. Assemble the outer tank side plates in a stacked manner from the lower to the upper layer on the outer tank bottom plate assembled on the foundation, and when the height of the outer tank side plates is lower than the first or second layer, partial bottom cooling is carried out. After construction, temporarily place the plate member of the inner tank bottom plate above it, assemble the uppermost inner tank side plate in a cylindrical shape on the inner tank annular plate, and install the inner tank roof above the inner tank side plate. are assembled and the roof is placed above the side plate, and the outer tank roof is assembled on the roof via the support member, and these two roofs are joined together, and the assembly of the outer tank side plate is completed up to the top level. Then, the outer tank roof and the inner tank roof are lifted up using a plurality of lift-up jacks suspended from the upper end of the outer tank side plate, and the outer tank roof is attached to the upper end of the outer tank side plate, and the annular plate inside the inner tank is lifted. Assemble the inner tank side panels from the upper tier to the lower tier using the jack-up method using multiple jacks erected above, and attach the inner tank roof to the upper end of the inner tank side panels.
A method for constructing a double-shell storage tank, comprising the steps of: completely performing cold insulation at the bottom; and assembling the inner tank bottom plate by arranging the temporarily placed plate members of the inner tank bottom plate.