JPS5820869A - Building of double shell low temperature underground tank - Google Patents

Abstract

(57) [Abstract] 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 for constructing a heavy-shell low-temperature underground tank, which is particularly advantageous when relocating an existing above-ground tack underground. An underground wall is constructed to surround the support pile driven into the ground for support, and then the ground within the underground wall is excavated to the required depth, and the gear is supported on the ground or from the pile after excavation. A stand is provided and an appropriate number of jacks are installed, each jack is used to support the support floor, and in this state, the upper part of the support pile is removed to a required length, and then each jack is shrunk and the floor is placed on the floor. The double-shell cryogenic tank can be used as it is, or while constructing the double-shell cryogenic tank on the floor, the support bed is lowered and supported on the support piles after the upper part has been removed, and each jack is removed, and after the jack is removed again. The purpose is to excavate the ground to a required depth, and then repeat the above steps an appropriate number of times to gradually lower the supporting bed and construct the tank underground.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows a double-shell cryogenic tank (2) installed on the ground side via a floating floor (3) on a large number of support piles (1) driven into the ground. Note that (4) in the figure is a dike.

When relocating the tank (2) installed on the ground in this way underground, first a continuous underground wall (5) is built underground using the pentonite wall construction method to surround each support pile (1). (see Figure 2), then construct the continuous underground wall (5
) Excavate the earth and sand to the required depth in the ground (see Figure 5)
. When excavating in this way, the ground surface after excavation and the floating bed (
Since a space is formed between 3), install the required number of jacks (6) on the ground in this space (or on the jack support stand provided on the pile (1)), and 6
) is stretched appropriately. When each jack (6) is extended, the tank (2) is pushed upward through the floating floor (3), so the floating floor (6) is attached to each support pile so that a gap is formed between it and each support pile (1). Separate from the pile (1). Tank (2)
is pushed up and a gap is formed between the floating floor (3) and each support pile (1), then each support pile (1) protruding from the ground
(See Figure 4), then push up the upper part of the tether (2) to the required length and remove it (see Figure 4).
6) is lowered by contracting, and the upper part is cut off and removed, and then placed on each support pile (1) via a floating bed (3) for support, and each jack (6) is removed. Again, excavate the earth and sand in the ground within the continuous underground wall (5) to the required depth (see Figure 5), and then repeat the above process an appropriate number of times to lower the tank (2) one by one. Finally, the tank (2) is installed underground as shown in Figure 6. In addition, by the above work, continuous underground wall (5)
The inner periphery of the tank protrudes, forming a liquid barrier.

In the embodiment described above, the existing above-ground tank (2
) has been shown to be relocated underground, but the present invention can be implemented in the same way for newly installed tanks. That is, in the case of a newly constructed tank, the tank may be constructed on the floating floor (3), and the above-mentioned work process [•] may be performed in parallel. Also, at this time, by using a refill type support pile (1) that is driven into the ground, the work of removing the upper part of the support pile (1) one by one can be done easily and quickly. can.

In addition, in the above example, the case where the pentonite wall construction method was used when constructing a continuous underground wall was illustrated,
It is also possible to form a continuous underground wall by driving steel sheet piles, etc., and it goes without saying that various changes can be made without departing from the gist of the invention.

As described above, according to the present invention, it is possible to easily relocate an existing above-ground tank or to construct a new tank underground, and in this case, it is possible to easily relocate an existing above-ground tank or to construct a new tank underground. Since it does not require a large work area, it exhibits excellent effects such as being extremely advantageous in terms of space.

[Brief explanation of the drawing]

FIGS. 1 to 6 are explanatory diagrams showing the work steps of the construction method of the present invention. (1)...Support pile, (2)...Tank, (3)...Floating floor, (4)...Dike, (5)...Continuous underground wall, (6)...
・Jyatsuki. Figure 3 1 Figure 6 329-

Claims (1)

[Claims] 1) Construct an underground wall to surround the support piles driven into the ground to support the tank support floor, then excavate the ground within the underground wall to the required depth, and apply jacks after excavation. Several units were installed and the support bed was supported by each jack, and in this state, the upper part of the support pile was removed to a required length, and then each jack was shrunk and the double-shell cryogenic tank on the floor was left as it was. Alternatively, while constructing a double-shell cryogenic tank on the floor, lower the supporting bed and support it on the support piles after removing the upper part, remove each jack, and excavate the ground to the required depth after removing the jack again. A construction method for a double cryogenic tank, characterized in that the above-mentioned process is repeated an appropriate number of times to gradually lower the support bed and construct an underground tank.