JPS62133258A - Construction method for enlarging underground 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] [Industrial Application] The present invention relates to an economical method for constructing large-scale underground storage tanks.

[Conventional technology]

At a receiving or discharging terminal for LNG, LPG, crude oil, etc., there may be a request to expand the capacity of the storage tank facility (for example, underground storage tank, etc.) due to operating conditions or other reasons.

In such cases, there is no problem if land for constructing the new facility can be secured within the base or adjacent land, but in many cases it is difficult to secure land in other areas. In this case, the existing facility will be dismantled and a new, larger storage tank facility will be constructed on its site.

[Problem that the invention seeks to solve]

However, dismantling existing equipment and constructing new equipment on its site requires high costs for both demolition and new construction, which poses an economic problem. In order to increase the capacity of underground storage tanks, which are generally used frequently as storage tank equipment, it is possible to increase the inner diameter or increase the height or depth. In order to increase the inner diameter, it is necessary to dismantle and remove old equipment, and to increase the height,
After dismantling the roof structure, new side walls and a roof must be constructed, which requires a large amount of cost in any case. If the bottom is deeply excavated in an attempt to increase the depth of the trident, problems will arise with respect to the strength of the existing structure due to the inflow of groundwater or an increase in the amount of soil.

The present invention has been made to solve the problems associated with construction to increase the capacity of underground storage tanks, and provides a method for expanding the capacity of underground storage tanks that does not have problems with strength and does not require large construction costs. That is.

[Means for solving problems]

In order to achieve the above object, a new underground wall is constructed in contact with the outer surface of the framework of the underground storage tank, and the underground wall and the existing framework are combined to form a composite framework. Next, a support arm connected to the upper edge of the storage tank is constructed at the upper end of the new underground wall, and after the weight of the storage tank frame is supported by the new underground wall via the arm, the bottom of the existing frame is The project will be completed by dismantling the building, excavating the ground, constructing new side walls and a new bottom, and constructing interior work.

[Effect]

According to this construction method, the above-mentioned underground wall and the existing frame form a composite wall, so the thickness of the new underground wall can be made thinner, and demolition work is only required at the bottom, so it is possible to expand the capacity. Construction work for this purpose can be done at low cost.

[Embodiments of the invention]

FIGS. 1 to 5 are explanatory diagrams of the capacity expansion work of an underground storage tank showing one embodiment of the present invention. In the figure (1) is an underground storage tank, (
2) is the frame, (3) is the continuous underground wall, (4) is the bottom, (5
) is the roof, (6) is the interior material, (7) is the liquid receiving and discharging equipment, (
8) is a new underground wall, (9) is a support arm, (10) is 1
Excavator, (!l) is the ground, (12) is the new bottom, (13
) is the liquid receiving and discharging equipment expansion section.

Figure 1 shows an existing underground storage tank that is targeted for capacity expansion.In order to expand the capacity of this storage tank (11), the depth of the storage tank is to be increased. A new underground wall (8) will be constructed so as to be in contact with the outer periphery of the existing underground wall (3) of the storage tank (11).The depth of this wall will be slightly larger than the bottom of the tank (11).

This new underground wall (8) overlaps the frame (2) of the storage tank (1) and the underground wall (3), so it acts as a stacked beam against external forces. ) thickness is
It does not need to be very thick, and is made thin enough to withstand external forces to reduce costs. Next, a support arm (9) is constructed by connecting it to the existing frame (2) as shown in Figure 3, and the weight of the frame (2) of the existing storage tank (1) is transferred to the new underground wall (
8). Next, as shown in Figure 4, the storage tank (
The bottom part (4) of 11 is dismantled and the ground (11) is excavated using 1 excavator (10) to increase the depth. Furthermore, the fifth
As shown in the figure, a new bottom part (12) is constructed at a predetermined depth,
Complete the construction by installing interior materials (6) and adding liquid receiving and discharging equipment.

The above embodiment is an example of a method for expanding the capacity of underground storage tanks for ordinary LPG, LNG, crude oil, etc.

It is possible to freely handle underground storage tanks for not only LNG and crude oil but also other types of liquids by changing the specifications of the interior construction in the final process.

〔Effect of the invention〕

In order to expand the capacity of an existing underground storage tank, the present invention constructs an underground wall, supports the frame of the existing storage tank on the underground wall, and raises the bottom ground to increase its depth. By using the filtration method, we were able to achieve the excellent effects described below.

■ No special land is required for capacity expansion.

■ The dismantling of existing storage tanks can be kept to a minimum.

■ The framework of the existing storage tank can be utilized to the maximum.

■ Therefore, construction costs can be kept low.

[Brief explanation of drawings]

Figures 1 to 5 are construction explanatory diagrams showing embodiments of the present invention.
Figure 1 is a cross-sectional view of the existing storage tank, Figure 2 is a cross-sectional view after constructing a new underground wall, Figure 3 is a cross-sectional view after constructing a support arm, and Figure 4 is a cross-sectional view of the existing storage tank.
The figure is a cross-sectional view showing ground excavation, and Figure 5 is a cross-sectional view after capacity expansion work has been completed. In the diagram, (1) is the underground storage tank, (2) is the frame, (3) is the underground wall, (4) is the bottom, (6) is the interior material, (8) is the new underground wall, and (9) is the support. The arm, (10) is the old cutting machine, (11) is the ground, (12) is the new bottom, and (13) is the new receiving and discharging equipment. Agent Patent Attorney Tadashi Sato Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] In an underground storage tank whose capacity is to be expanded, a new underground wall is first constructed in contact with the outer surface of the structure of the storage tank, and then a support is attached to the upper end of the new underground wall to connect to the upper edge of the storage tank. After constructing an arm to support the weight of the storage tank on the new underground wall, the bottom of the storage tank is dismantled, the ground beneath it is excavated to a predetermined depth, a new bottom is constructed, and the above-mentioned A construction method for increasing the size of an underground storage tank, which is characterized by increasing the depth of the storage tank.