JPS5827988Y2 - Earthquake-resistant storage tank - Google Patents

Description

[Detailed description of the invention] This application relates to storage tanks for storing liquids such as crude oil, and in particular to earthquake-resistant embankment foundations intended to prevent storage tanks from sliding left and right or sinking into the foundation during an earthquake. This is a design related to a type storage tank.

As shown in Figure 1, conventionally used storage tanks for storing crude oil, etc., are almost all constructed directly on the ground (a);
In addition, compared to the diameter of the storage tank, the amount of protrusion W of the bottom end plate b (usually called annular plate) from the side plate is extremely small. When a large earthquake occurs, the storage tank C slides from side to side, or the entire storage tank shakes from side to side due to the sloshing of the contents (sloshing), and the base of the side plate lifts (
As shown in Figure 2, the annular plate immediately below the side plate d sinks into the foundation a (depth e), and the reaction force from the foundation generates a very large bending stress in the annular plate. However, there was an inherent danger that this would lead to the destruction of storage tank C.

In fact, during the Miyagi Festival of Light Earthquake, most of the storage tanks were observed to sink in.

The present application was devised in view of these shortcomings of the conventional storage tank structure, and the storage tank sways during earthquakes, etc.
The purpose is to provide an earthquake-resistant storage tank that prevents sliding and local uneven settlement as much as possible, and the overall structure is that the lower end of the side plate of the storage tank is built on an embankment foundation with a constant It has a structure in which it is buried within the depth embankment foundation, a horizontal rocking reduction plate is attached to the lower end of the side plate, and the rocking reduction plate is placed on a crushed stone ring constructed within the embankment foundation.

Now, to explain one embodiment, a crushed stone ring 10 is constructed at a certain depth within an embankment foundation 1 constructed by earth mounding, and a horizontal annular rocking reduction plate is placed on the crushed stone ring 10. A foundation inner plate 3a with a height h' slightly lower than the top surface 1a of the embankment foundation 1 is fixed upright approximately in the center of the horizontal annular rocking reduction plate 4, and the foundation inner plate 3a is tilted to the upper end of the foundation inner plate 3a. The lower end of the T-shaped ring 3b is connected to the horizontal part 3
b' is fixed so as to be located inside the storage tank 2, and the upper side plate 3C is fixed to the upper end of the upside-down T-shaped ring 3b in an upright position at a desired height to form the side plate 3.

An annular plate 5 is annularly fixed to the inner end of the horizontal portion 3b' of the ring 3b, and a bottom plate 6 is disposed on the entire inner surface of the annular plate 5 and fixed by welding.

Incidentally, the horizontal portion 3b', the annular plate 5, and the bottom plate 6 are stably supported on the upper surface of the embankment foundation 1.

In addition, a suitable number of side plate reinforcing rib plates 7 are fixed to the inside and outside of the base inner plate 3a and to the locking reduction plate 4 and the base inner plate 3a at appropriate intervals by welding.

Furthermore, the inner end of the horizontal plate 8b of the angle member 8 is fixed to the upper side plate 3C so that the vertical plate 8a is located outside of the upper side plate 3C and above the square-shaped ring 3b. The upper end of the rainwater intrusion prevention plate 9 is fixed to the outside of the plate 9, and the lower end is buried and fixed within the foundation 1.

With the above-mentioned configuration, the present application has the bottom plate 6 supported on the upper surface 1a of the embankment foundation 1, the rocking reduction plate 4 at the lower end of the foundation inner plate 3a of the side plate 3 buried in the embankment foundation 1, and the foundation inner plate 3a. Since it supports the storage tank 2, rocking due to sloshing can be effectively prevented, and the base inner plate 3a receives the bending moment applied to the connecting corner 11 between the side plate and the bottom plate due to the liquid content against the upper side plate 3C. This prevents cracks in the connecting corner portion 11 due to bending moments, and furthermore, the connection between the upper side plate 3C1, the base inner side plate 3a, and the annual plate 5 is made by a square-shaped ring 3b, which increases the strength against bending moments. Furthermore, since the rocking reduction plate 4 is supported on the stone crushing ring 10, it is possible to further prevent the side plate 3 from sinking.

In the present application, in a storage tank 2 constructed on an embankment foundation 1 in a diagonal manner, the lower end of the side plate 3 of the storage tank 2 is buried in the embankment foundation 1 to a certain depth, and a horizontal rocking reduction plate is attached to the lower end of the side plate 3. 4 is attached, and the rocking reduction plate 4 is placed on the crushed stone ring 10 constructed within the embankment foundation 1, so the side plate of the storage tank is supported on the embankment foundation by the bottom plate, the foundation inner plate, and the rocking reduction plate. Therefore, the soil bearing capacity of the embankment foundation on the sinking side of the tank during rocking during an earthquake can be sufficiently distributed, and it is also possible to prevent the tank body from shaking, sliding, and local uneven settlement due to sloshing of the stored liquid. Moreover, the crushed stone ring on the lower side of the rocking reduction plate further enhances this effect, and the loading earth pressure on the top surface of the horizontal member and the inner side plate of the foundation acts as a resistance against the lifting and sliding of the tank during rocking. death,
By reducing the bending moment applied to the connecting corner between the side plate and the bottom plate by the inner base plate, it is possible to prevent cracks that may occur in this area.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views of conventional storage tanks; Figure 1 is a cross-sectional view in a normal state, Figure 2 is a cross-sectional view in a state where staining has occurred, and Figure 3 is a cross-sectional view of the basic configuration of the present application. 4 is a sectional view of the storage tank, FIG. 4 is a sectional view of an embodiment of the present application, and FIG. 5 is an enlarged sectional view of a part of FIG. 4. 1...Foundation, 2...Storage tank, 3.
...Side plate, 4...Rocking reduction plate.

Claims (1)

[Scope of utility model registration request] In the storage tank 2 constructed on the embankment foundation 1, the lower end of the side plate 3 of the storage tank 2 is buried in the embankment foundation 1 to a certain depth, and a horizontal rocking reduction plate 4 is attached to the lower end of the side plate 3. 4 is placed on a crushed stone ring 10 constructed within an embankment foundation 1 to form an earthquake-resistant storage tank.