JPS5916625B2 - How to build an underground tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing an underground tank suitable for storing high temperature, low temperature, and high pressure liquids such as LPG.

In recent years, tanks for storing the liquid have tended to be constructed underground for security reasons and other reasons.

5 However, while conventional underground tanks are generally made of reinforced concrete with sufficient strength to prevent damage from earthquakes and other events, they are also lined with steel plates or other materials with an insulating material inside the reinforced concrete to prevent leakage and evaporation of the stored liquid. has been done.

As tanks become larger capacity tanks, it is necessary to gradually thicken the reinforced concrete side walls and increase the size of the reinforcing bars, and all of this construction work must be done on-site, resulting in a large amount of construction work. It requires a lot of money and a long construction period. 15 Recently, construction methods have become more economical than the conventional construction methods, in which segments and panels produced in factories are assembled on the ground, or, while being assembled, they are sunk underground using the well method. It has attracted attention because it is highly versatile, requires less area for construction, does not disrupt the living environment of the surrounding area, and shortens the construction period.

However, although this construction method has been put into practical use for constructing water storage tanks, there are problems with bond strength and other problems, and there are still problems in constructing J5 storage tanks for high-temperature, high-pressure liquids such as liquefied gas. The current situation is that there are many. Based on the above-mentioned viewpoint, it is an object of the present invention to provide an extremely effective and suitable method for constructing an underground tank that uses economically obtainable segments and provides a tank body with high strength. .

The present invention will be specifically explained below with reference to the drawings.
FIGS. 1 and 2 show an embodiment of the present invention. FIG. 1 is a schematic perspective view illustrating the structure of a tank peripheral wall, and FIG. 2 is an explanatory cross-sectional view of the same. i5 First, in the place where the underground tank E is to be constructed, tank peripheral wall constituent members 4 such as segments or plates having insertion holes 2 and 3 for the press dress wire 1 vertically and horizontally are arranged in an annular manner with a space a between the inner and outer sides. 1
multiple parts 414243 of each tank peripheral wall component 4
, at least one of the adjacent structural members 444, 46
3 were overlapped and connected to each other by the press dress wire 1, and a strong tensile force was applied to each of them to give a strong press dress to the tank circumferential wall, thereby forming the first stage tank inner and outer circumferential walls A1. After that, concrete 5 is filled between the inner and outer circumferential walls a of the tank, and the inner and outer circumferential walls A2 of the second stage tank are constructed again in the same manner as the first stage, and the third stage A3 is built one after another on top of the second stage tank inner and outer peripheral walls A2. After completing the construction of the tank peripheral wall of the required number of stages, a strong tensile force is applied to the press dressing wire 1 inserted vertically through each peripheral wall to apply a vertical press dress to the tank peripheral wall E, After the concrete filled between the inner and outer circumferential walls of the tank has solidified, a bottom plate is constructed, and a membrane is attached to the inside of the inner circumferential wall with an appropriate heat insulating material interposed therebetween as necessary to complete the construction of the underground tank. When constructing an underground tank using the present invention, after completing the construction of the tank surrounding wall above ground, it may be lowered into the ground by the Uelue method, or alternatively, each stage may be constructed by the Uelue method. It is of course possible to proceed with the construction work while allowing the structure to sink due to the soil, or it may be constructed in a hole that has been dug in advance.

As described above, this invention connects a plurality of tank peripheral wall constituent members arranged in an annular manner with double spacing between the inner and outer sides, with at least one of the adjacent constituent members overlapping, using a press dress wire, By applying a strong tensile force to each of these, press dressing is applied to the tank circumferential wall.After constructing the required number of inner and outer circumferential walls of the tank, a tensile force is applied to each press dressing wire inserted vertically. Since press dressing is applied in the vertical direction as well, strong press dressing can be applied vertically and horizontally between the constituent members of each tank peripheral wall, and as a result, it is possible to easily create a tank with extremely high resistance to internal pressure. In addition, the wall thickness can be freely set according to the width of the space in accordance with the scale of the tank to be constructed, and furthermore, segments or plates that are mass-produced in factories can be used. Therefore, its industrial effects are extremely large, such as being extremely economical.

Furthermore, in the present invention, by finally applying a vertical press dress, it is possible to apply a press dress to the concrete 5 placed between the inner and outer circumferential walls a. The overall structure of the tank wall is an ideal structure that is extremely robust. In other words, since the press dress applied to the inner and outer peripheral walls is initially only in the circumferential direction, the concrete 5
Due to the pressure of pouring, the inner and outer circumferential walls are slightly bent in the direction of separating from each other, but by finally applying a press dress in the vertical direction, the concrete 5 narrowed by the inner and outer circumferential walls is Due to surface friction resistance with the surrounding surfaces, a press dress is applied in the vertical direction as well as on the inner and outer peripheral walls.
In addition, since the inner and outer circumferential walls, which had been bent in the direction slightly apart, are restored to their original shape, the concrete 5 is also press-dressed in the direction in which its wall thickness is compressed, making it extremely robust. It becomes a structure. Note that the reason why the press dress wires in the circumferential direction are partially overlapped without making one turn is that each block can be connected more strongly than if the press dress wires were made to go around once and then tightened. This prevents the inner and outer peripheral walls from bending too much when the concrete 5 is placed between the inner and outer peripheral walls.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic perspective view illustrating the structure of a tank peripheral wall, and FIG. 2 is an explanatory cross-sectional view of the same. In the drawing, 1... Press dress wire, 2.
...Through hole (vertical), 3...Through hole (horizontal)
, 4...tank peripheral wall constituent members, 5...
concrete.

Claims (1)

[Claims] 1. Tank circumferential wall constituent members having prestress wire insertion holes are arranged in a ring shape with double spacing between the inner and outer sides, and a plurality of these tank circumferential wall constituent members are overlapped with at least one of the adjacent constituent members. At the very least, the inner and outer peripheral walls of the tank are connected with a prestress wire, and a strong tensile force is applied to each wire to give prestress to the inner and outer peripheral walls of the tank.Concrete is then filled between the inner and outer peripheral walls of the tank, and the inner and outer walls of the tank are connected in the required number of stages. An underground tank construction method characterized in that after the peripheral wall is constructed, a strong tensile force is applied to each prestress wire inserted vertically, thereby imparting prestress in the vertical direction as well.