JPS59138671A - Construction of double-shell storage 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 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. In this case, a large-capacity jacket is required to integrally jack up the roof and side panels of the inner and outer tanks, and as the storage tank becomes larger, it is necessary to secure a huge amount of jacking equipment, which causes problems in terms of transportation and equipment maintenance. However, there was a problem in that it required a lot of cost.

In order to solve this conventional problem, the present invention constructs the side panels of the outer tank in a stacked manner from the lower tier to the upper tier, while the inner tank side panels are constructed sequentially from the upper tier to the lower tier using the jack-up method. 2 at the lower stage during the assembly of the tank side plate.
One or both of the inner tank roof assembled on the upper end of the line side plate and the outer tank roof assembled on the roof are lifted by a lift-up jack suspended from the upper end of the outer tank side plate, and the roof is placed on the upper end of the side plate. It is characterized by complete installation.

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 place 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 annealer plate 5 is laid on the solidified pearlite concrete 3, and a plurality of jacks 6 are placed on it at appropriate intervals. 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 in a cylindrical shape on the annealer plate 5 outside the jack 6, attach the knuckle plate 10 thereon, and install the temporary roof support 11 on the outer tank bottom plate 2. While supporting this, assemble the aggregate for the inner tank roof, arrange and attach the plates of the inner tank roof 12 on top of it, and install the outer tank roof frame and the outer tank roof 1 on the inner tank roof 12.
The plates No. 3 are assembled and placed, and 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 the 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, and attach them to the upper end of the outer tank side plate 2 as a temporary roof. Pillar 1
At the same time as removing 1, or after that, 2 from the upper part of the inner tank side plate 4.
The subsequent stages are assembled sequentially from the upper stage to the lower stage by the jack-up method using jacks 6, and in parallel with this or after the installation of the outer tank roof 13 is completed, the bottom cooling insulation 7 is completely installed. All the plate members of the inner tank bottom plate are arranged on top of the bottom plate assembly frame 8, and the inner tank bottom plate 16 is assembled by welding both sides.

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

Thereafter, the pressure resistance and airtightness tests of the inner tank, the closing of the construction opening 14, the airtightness test of the outer tank, and the cold insulation construction of the inner and outer tanks are completed.

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

(3') Assemble the upper first stage of the inner tank side plate in a cylindrical shape on the annealer plate 5 outside the jack 6, and attach the outer tank bottom plate 2.
The knuckle plate 10 and the inner tank roof frame are assembled on the inner tank side plate 4 so as to be supported by temporary struts 11 erected above, and the plate members of the inner tank roof 12 are mounted on the roof frame. The arrangement and installation involves joining the lower end of the plate of the roof 12 and the upper end of the knuckle plate 10 by welding, and also attaching the inner roof 12.
The outer tank roof frame is assembled on top via the support member 17, and all the plate members of the outer tank roof 13 are placed thereon, and the arrangement and assembly are performed at an appropriate time. In this case, the lower end of the wall plate 10 and the upper end of the inner tank side plate 4 are only brought into line with each other, 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 hole 14 is provided under the outer tank side plate 2 and is used for carrying in and out of parts, equipment, etc.

(4') Next, using a plurality of lift-up jacks 15 suspended from the upper end of the outer tank side plate 2, the outer tank roof 13 and the inner tank roof 12 with the knuckle plate io' 2 attached are integrally lifted up and removed. To attach the tank roof 13 to the upper end of the outer tank side plate 2, remove the temporary support 11. At the same time or after that, assemble the inner tank side plate 4 sequentially from the upper layer to the lower layer using the jack-up method using the jacks 6, and first raise the heel. When the upper end of the inner tank side plate 4 reaches the lower end of the knuckle plate 1o attached to a certain inner tank roof 12, these are welded and joined together, and in parallel with this, the bottom cooling insulation 7 is installed on the entire surface, and the bottom cooling insulation 7 is installed on the entire surface. Inner tank bottom plate 16 is placed on top of 7 via bottom plate assembly frame 8.
The inner tank bottom plate 16 is completely assembled and constructed by arranging the plate members.

Thereafter, the process is completed by the same method as (5) described in the description of the above embodiment.

In any of the embodiments, the outer tank side plate 2 is first assembled to the first stage, but it is also possible to assemble it to about 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. In addition, 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 annealer plate 5. Construction can be carried out smoothly by moving to the position shown below.

According to the present invention, the outer tank side plates are assembled by stacking and the inner tank side plates are assembled by the jack-up method, so the jacks for jacking up do not need to bear the weight of the outer tank, and the jacks are /J's type. The inner tank bottom plate is temporarily placed on the partial bottom cooling section of the storage tank when the outer tank side plate is first or second stage low. It is convenient because the inner tank bottom plate can be easily assembled after the roof is assembled, and the inner tank roof and the outer tank roof can be assembled on top of the top of the inner tank side panels when the outer tank side panels are low. When the outer tank side plates are assembled to the upper level, the outer tank roof can be hung from the upper level of the 5th side plate or lifted up using the lift jack, so the outer tank roof can be installed safely and efficiently. After the outer tank roof is installed, the bottom cooling insulation is completely installed, which prevents delays in construction due to weather such as rain.Also, by installing the outer tank roof early, it is possible to perform subsequent construction using the jack-up method for the inner tank side panels. The work can be carried out 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 carried out smoothly in parallel with the assembly of the inner side panels. Inner tank side plate f that can shorten the construction period:
Compared to the stacking 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 drawings]

1 to 5 are longitudinal cross-sectional views for explaining detailed explanations 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... Pearlite plate, 4... Inner tank side plate, 5... Annealer plate, 6... Jacket, 7 ...Bottom cold storage, 8
...tank bottom plate, 17... support member Fig. 1 Fig. 3 Fig. 4 Fig. 5 Fig. 6

Claims (2)

[Claims] (1) When the outer tank side plates are assembled in a stacked manner from the lower to the upper layer on the outer tank bottom plate assembled on the foundation, and the height of the outer tank side plates is lower than the first or second level. First, a partial bottom cooling system was constructed, and the plate members of the inner tank bottom plate were temporarily placed above it, and the uppermost inner tank side plate and inner tank roof assembled in a cylindrical shape on the inner tank annealer plate were installed. 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, they are removed using multiple lift-up jacks suspended from the top of the outer tank side panels. The entire tank roof is lifted up and attached to the upper end of the outer tank side plate, and the inner tank side plate is assembled from the upper to the lower layer using the jack-up method using multiple jacks set up on the annealer plate inside the inner tank, and the bottom is completely cooled. A method for constructing a double-shell storage tank, characterized in that the inner tank bottom plate is assembled by arranging the plate members of the inner tank bottom plate that have been temporarily placed during construction. (2) Assemble the outer tank side plates in a stacked manner from the lower level to the upper level on the outer tank bottom plate assembled on the foundation, and when the height of the outer tank side plates is low at the first or second level, the partial bottom After constructing the cold insulation, 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 annual plate, and place it above the inner tank side plate. The inner tank roof is assembled and the roof is placed above the side panels, and the outer tank roof is assembled on the roof via supporting members, and these two roofs are joined together, and the assembly of the outer tank side panels is the best. When the upper layer is completed, lift up the outer tank roof and inner roof using multiple lift-up jacks suspended from the upper end of the outer (east side) board, attach the outer tank roof to the upper end of the outer tank side board, and then attach the outer tank roof to the upper end of the outer tank side board. Assemble the inner tank roof by jacking up the inner tank side panels from the upper tier to the lower tier using a plurality of jacks set up on the annual plate, attach the inner tank roof to the upper end of the inner tank side panels, complete the construction of the bottom cold insulation, and carry out the above-mentioned temporary construction. A method for constructing a double shell storage tank, characterized in that the inner tank bottom plate is assembled by arranging the plate members of the inner tank bottom plate that have been placed.