JPS5812785Y2 - Liquid-tight structure of liquid tank - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a liquid-tight structure for a liquid tank.

In recent years, the need for petroleum stockpiling has increased, and various types of onshore and offshore storage tanks are being planned.

Ensuring safety is an absolutely necessary condition for tanks that store large amounts of oil.

In order to ensure the safety of a tank, in addition to having sufficient strength, the tank must also be oil-tight to prevent oil from leaking from the tank.

FIG. 1 shows an example of a liquid tank to which the present invention is applied.

That is, the liquid tank 1 includes a lower concrete wall 2,
It is composed of a steel plate upper wall 3 and a steel roof 4. The lower end of the steel plate upper wall 3 is embedded in the upper end of the Conchnaut lower wall 2, and the steel roof 4 is a floating roof or a fixed roof. .

In this type of liquid tank 1, oil tightness is a problem in the walls 2 and 3 themselves and the joints 5 between these walls 2 and 3.
There are three locations.

Of these, the lower concrete wall 2 is made of water-tight concrete, and the steel plate upper wall 3 is made of oil-tight construction by completely welding the steel plate joints.

However, since the joint portion 5 has a structure that has not been proven to be oil-tight in the past, it is necessary to provide some kind of oil-tight structure.

By the way, in general, when a steel plate and concrete are sandwiched together, the adhesion force of the concrete to the steel plate is small, and the concrete easily separates due to impact or deformation.

Concrete always contains air bubbles, and these air bubbles tend to connect on the surface of the steel plate, forming what is called a tunnel.

Therefore, it is difficult to ensure oil tightness between the steel plate and the concrete surface.

A model of the liquid tank 1 shown in Fig. 1 was made, and the wave crest H was set to 2.
As a result of the experiment at 5 m, leakage was observed as expected.

Therefore, as shown in Fig. 2, a water stop rubber 8 of a special shape (P-type rubber) is attached to the lower end of the steel plate upper wall 3 via a presser metal fitting 6 and a fixture 7 (bolts and nuts). Seen as a dense structure.

In this case as well, as a result of experimenting with the wave crest H at 25 m,
Leakage indicated by broken line 9 was observed.

This is because the weight of the steel plate upper wall 3 is small, so it seems that a liquid-tight effect cannot be expected.

The present invention proposes a liquid-tight structure for a liquid tank that can be expected to have a sufficient liquid-tight effect while employing a steel plate upper wall with low self-weight.An example of this is shown in Figs. 3 to 6 below. The explanation will be based on.

As shown in FIG. 6, the liquid tank 10 is composed of a lower wall 11 made of concrete and an upper wall 12 made of steel plate.

This embedded part 12a is inserted into the recess 13 formed on the upper surface side of the concrete lower wall 11 and at the middle part in the width direction, and occupies the entire recess space formed on the tank exterior 14 side and the inside of the tank. The first concrete 1-16 is poured in the lower part of the four-part space formed on the 15 side! It's happening.

Inside the tank] On top of the 5th measurement of 1st concrete I.] 6, asphalt 1 to 17 that is in contact with the inner circumference of the embedded part 12a0 is filled, and a second concrete 1 to 18 is placed on top of it. There is.

FIG. 3 shows the casting and forming state of the concrete tool 11 having a recess 13, and FIG. Indicates a set state.

FIG. 5 shows the state in which the first concrete 116 is poured.

This first concrete 16 prevents leakage of the asphalt 1 to 17 that will be filled later.

After the first concrete l-16 has hardened, highly adhesive asphalt 1 to 17 are added, and then the second concrete l-16
8 is poured, and this second concrete] 8 is made of steel plate.

Necessary for positioning the part 12 and preventing buckling.

Incidentally, the asphalt) 17 may be simultaneously filled on the outside 14 side of the tank, that is, around the well of the embedded portion 12a.

As described above, according to the present invention, it is possible to fill the space between the concrete 1 to binding wall and the upper wall made of steel plate with asphalt, which has extremely high adhesiveness, to make it liquid-tight.

Therefore, it is possible to expect a sufficient liquid-tight effect even though the upper wall is made of steel plate and has a small weight.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing the basic structure of a liquid tank, Fig. 2 is a longitudinal sectional view of the main parts showing one embodiment, and Figs. 30 to 6 are longitudinal sectional views of the main parts showing one embodiment of the present invention. It is a front view.

Claims (1)

[Scope of utility model registration request] A liquid-tight structure for a liquid tank comprising a lower wall made of concrete and an upper wall made of steel plate, the inner periphery of the embedded part of the upper wall made of steel plate being filled with asphalt.