JPS6098064A - Construction of low temperature 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 low temperature double shell tank.

Conventionally, it takes more than a year to construct a large, low-temperature double-shell tank, and during rainy, cold, or snowy seasons, the construction must be temporarily stopped or the outer tank side plate 16 must be closed as shown in Figure 1.
At the same time, the inner tank roof 12 and outer tank roof 15 are assembled on the ground.The roof is floated using the jack-up method or air pressure and connected to the upper end of the side panels, completing the construction of the entire outer tank. This method uses a lifting device 27 attached to the outer tank roof 15 in the outer tank to assemble the inner tank side panels 11 times from the lower tier to the upper tier using a building block method. There is a lot of work involved, and a lot of money and effort is invested in ensuring quality. On the other hand, the jack-up method or spiral construction method, which involves assembling the side panels from the upper tier to the lower tier, eliminates most of the work at heights and allows work to be done from a low, fixed position, requiring less cost and labor. It is difficult to assemble both at the same time, so the inner tank is assembled using the jack-up or snow-covering construction method, and the outer tank is assembled using the stacking method, so construction has to be temporarily halted during periods of heavy rainfall, cold, or snowfall. There was a problem with the delay.

The present invention employs the jack-up method or the Sviralue method, which allows construction of not only the inner tank, which requires high quality, but also the outer tank side panels at a low fixed position, and constructs the inner and outer tank side panels by placing the outer tank roof and side panels in advance. In addition to constructing these side panels in parallel, the bottom of the inner tank is also constructed in order to provide an economical method for constructing the inner tank in a short construction period without having to temporarily stop construction even in regions with heavy rain, cold, or snowfall. That is.

A case where the jack-up method is employed as an embodiment of the present invention will be described with reference to the drawings.

Weld and assemble the outer tank bottom plate 2 on the foundation 1, and then
Pour tongue concrete 3 concentrically in a ring shape. An inner tank annular plate 4 is placed on the ring concrete part 3.
Array. In parallel with these pouring and arrangement operations, a part of the inner tank bottom cold insulation layer 5 is cast on the outer tank bottom plate 2 inside the ring concrete part 3, and the inner tank bottom plate member 6 is temporarily placed on top of it. At the same time, a temporary support 7 for the roof assembly is erected approximately at the center of the tank. Next, a plurality of roller blocks 8 are arranged on the outer tank bottom plate 2 in alignment with the predetermined positions of the outer tank side plate 140, and a plurality of column type jacking devices 9 for jacking up the outer tank are installed near the outside of the ring concrete part 3. A bracket-shaped frame 1 for assembling the inner tank knuckle plate 11 is installed on the top of the column type jacking device 9.
0, and place the inner tank knuckle plate 1 on top of the stand 1o.
1 and the inner tank roof 12 is assembled on the temporary supports 7. In parallel with the assembly of the inner tank roof 120, the outer tank side panels 13. , 14 are assembled on the roller block 8, and after completing the assembly of the inner tank roof 120, the outer tank roof part 15 is assembled and connected on the outer tank side plate 14. After completing the above work, the outer tank side plates 16 are assembled and welded from the upper stage to the lower stage at a constant low height using the column type jacking device 9, and the outer tank is successively constructed. In parallel with this outer tank construction work and the subsequent inner tank side plate construction work, temporary support columns 7 are dismantled and removed, reinforcing rings 17 protruding from the inner surface of the outer tank side plate are installed, and the entire inner tank bottom cold insulation layer 5 is constructed. The inner tank bottom plate members 6 that have been temporarily placed are aligned and welded to form the entire inner tank bottom plate 19. After the construction of the outer tank is completed, the bracket-like pedestal 10 on the strut type jacking device 9 is removed, and the plurality of strut type jacking devices 9 are reinstalled on the upper surface of the inner tank annual plate 4, and the strut type jack for the inner tank is installed. It will be reused as the device 23. At this time, the top of the strut-type jacking device 23 has a knuckle support strut 2 that reaches the inner surface of the inner tank knuckle plate 11.
A 0 has been added and several phrases have been cut. When performing this re-installation work, add knuckle support struts one set at a time to the strut-type jacking device 9 and perform the work in sequence, and when the re-installation work is completed, the strut-type jacking device 23 for jacking up the inner tank
is in a state where the inner tank roof 12 is supported by the inner surface of the inner tank knuckle plate 11. In this state, the roller block 21 for jacking up the inner tank is arranged on the upper surface near the outer periphery of the inner tank annual plate 4 in alignment with a predetermined position on the inner tank side plate 26. The inner tank side plate members 24 and 25 of the uppermost stage and the next stage are sequentially carried onto the roller block 21 through the construction opening 22 provided in the outer tank side plate 16, placed on the roller block 21, and arranged in a cylindrical shape. Connection with the tank knuckle plate 11 is performed. The column-type jacking device 23 is used to jack up the inner tank side plates, inner tank knuckle plates, and inner tank roof of the top and next stages, and the inner tank side plate members are brought in from the construction opening 22 and arranged in a ring on the roller block 21. The inner tank side panels, which require high quality, are built in sequence from the upper level to the lower level in the outer tank at a lower fixed position, and when the construction of the inner tank is completed, unnecessary equipment, etc. is carried out from the construction opening 22. Construction opening 22
Close. In this embodiment, a bracket-shaped pedestal for assembling the inner tank knuckle plate 11 is attached to the top of the column-type jacking device for assembling the outer tank side plate, and the inner tank knuckle plate is assembled on top of this pedestal using this mount. This frame is easy to install, and the column-type jacking device used for constructing the outer tank side panel can be reinstalled and reused for constructing the inner tank side panel, so there is no need to increase the number of column-type jackers required for both the inner and outer tanks. Both boards can be constructed using the jack-up method, which is economical.

The case where the spiral up method is adopted instead of the jack up method will be explained based on drawings. An outer tank bottom plate 2 is arranged on the foundation 1, and a ring concrete part 3 is concentrically poured thereon in an annular shape.

In parallel with the placing and arranging of the inner tank annealer plates 4 on the ring concrete part 3, a part of the inner tank bottom cold insulation layer 5 is placed on the outer tank bottom plate 2 inside the ring concrete part 3. The inner tank bottom plate side 6 is temporarily placed thereon, and a temporary support 7 for the roof assembly is erected in the center of the tank. Next, the lowermost inner tank side plate 28 is assembled on the inner tank annealer plate 4, and the base 29 for assembling the inner tank root is assembled on the lowermost inner tank side plate 28. The uppermost inner tank side plate 30, knuckle plate 11, and inner tank roof 12 are assembled on top of these.

After these assemblies are completed, assemble the outer tank side plate at the lowest level and the outer tank side plate spiral up roll 32, and then assemble the outer tank side plate at the top 33 and the outer tank roof part 15 on top of these, and then the outer tank side plate 16.
Assembly and welding is performed at a certain position lower than the upper stage to construct the outer tank. In parallel with these, a reinforcing ring 17 for the outer tank side plate is attached, and an inner tank bottom cold insulation layer 18 and an inner tank bottom plate 19 are constructed inside the inner tank. When the construction of the outer tank is completed, the inner tank roof assembly river temporary frame 29 is replaced with the inner tank spiral up roll 34, and a construction opening 2 is installed at the bottom of the outer tank side plate.
2 is installed, and the inner tanks are constructed sequentially from the upper stage to the lower stage at a constant low position. In this example, the roof of the inner tank is constructed using a frame placed in accordance with the position of the inner tank, and after the construction of the outer tank is completed, the frame is replaced with the spiral-up roll used for constructing the outer tank. , the inner tank is constructed using the spiral up method. According to this embodiment, both the outer tank and the inner tank are built using the spiral-up construction method, and are constructed sequentially from the upper stage to the lower stage at a constant low height, so the inner tank is safe and requires high quality. It can be constructed efficiently, and the spiral-up rolls used for constructing the outer tank can be transferred and used as they are when constructing the inner tank, so there is no need for extra rolls, and the spiral-up construction method can be used for both the inner and outer tanks. It is economical and can be built in 419 units.

According to the present invention, not only the outer tank side panels but also the inner tank side panels are constructed sequentially from the upper stage to the lower stage, so the side panels can be constructed at a low height below a certain level, and the inner tank requires particularly high quality. It has a remarkable effect on the construction of the side panels, and after assembling and installing the outer tank roof at an early stage, the inner tank side panels are constructed, the cold insulation layer is installed at the bottom of the inner tank, and the inner tank bottom plate is assembled inside the outer tank. So,
Even during rainy, cold, or snowy seasons, the construction of the inner tank can be continued without stopping, and the construction of the cold insulation layer at the bottom of the inner tank and the inner tank can be carried out in parallel with the construction of the outer tank side panels and inner tank side panels. As the tank bottom plate is assembled, construction time and costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view for explaining the conventional method, FIGS. 2 to 5 are longitudinal sectional views for explaining the present invention in detail, and FIGS. 6 to 8 are for explaining another embodiment of the present invention. FIG. DESCRIPTION OF SYMBOLS 1...Foundation, 2...Outer tank bottom plate, 3...Ring concrete pillar, 8...Roller block, 9...Strut-type jacking device, 10...Frame, 11...Inner tank Knuckle plate, 12... Inner tank roof, 13.14... Outer tank side plate, 15... Outer tank roof part, 16... Outer tank side plate, 17.
...Outer tank side plate reinforcement material, 18...Inner tank bottom cold insulation layer, 19
...Inner tank bottom plate, 20...Knuckle support column, 21.
... Roller block, n... Construction opening, 23... Pillar type jacking device, 24.25... Inner tank side plate member, 26
. . . Inner tank side plate, 27 . 32... Roll for spiral up, 33... Top stage of outer tank side plate, 34...
...Inner tank spiral up roll Fig. 2 Fig. 85 Fig. 6 Fig. 7 Fig. 8

Claims (1)

[Claims] After completing the construction of the outer tank bottom plate, a ring concrete part for the inner tank bottom is cast on the bottom plate, an inner tank annual plate is assembled on the ring concrete part, and a pedestal is installed on the outer tank bottom plate. Assemble the inner tank knuckle plate and the inner tank roof on top, assemble the outer phase side plates of the top tier only or the top tier and the next tier, and assemble and attach the outer tank roof to the upper end of the outer tank side plate of the top tier. Construct the tank side plates sequentially from the upper to the lower tier,
After the construction of the outer tank is completed, one piece of work installed on the side plate is used for loading and unloading the shrine equipment, etc., and the inner side boards are built in the outer tank from the top level to the bottom level, and the outer tank side plates are installed. and a method for constructing a low-temperature double-shell tank, which comprises constructing a cold insulation layer at the bottom of the inner tank and assembling the bottom plate of the inner tank in parallel with the construction of the inner tank side plates.