JPS61292595A - Lining 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 [Technical Field of the Invention] The present invention relates to a lined storage tank in which the inner surface of the storage tank has a concrete structure and is lined to store radioactive liquid waste and the like.

[Technical Background of the Invention and its Problems] Generally, lined storage tanks are installed in nuclear facilities, etc., to store liquids such as radioactive liquid waste that need to reduce the possibility of leakage as much as possible.

FIG. 4 shows an outline of this lined storage tank, and in the figure, reference numeral 1 indicates a concrete wall. The space inside this concrete wall 1 is vertically divided by an intermediate partition wall 2. The concrete wall 1 in the space below the intermediate wall 2 is lined with a lining plate 3 made of metal such as stainless steel, and radioactive liquid waste 4 or the like is stored in this space.

Figure 5 shows the middle partition wall 2 of such a conventional lined storage tank.
This installation involves first fixing the liner top channel 6 made of stainless steel or the like to the base material indicated by reference numeral 5 in the figure, and then attaching the liner top channel 6 to the concrete wall 1.
After forming the liner top channel 6, the receiver is placed in the stand 7.
, the backing metal 8 and the lining plate 3 are fixed by welding, and the receiver is attached to the bolt 9 fixed to the stand 7 with a packing 10. A washer 11 is inserted and the intermediate partition wall 2 is airtightly fixed with a nut 12.

However, in such a conventional Q-inning storage tank, since the support plate 7, backing metal 8, etc. are fixed to the liner top channel 6 by welding, the liner top channel 6 is deformed due to heat, and this liner top channel There is a problem that cracks occur in the concrete wall 1 in which 6 is buried.

In order to prevent such cracks, a lined storage tank as shown in FIG. 6 has been devised. In the lined storage tank shown in this figure, a stepped portion is provided on the inner surface of the concrete wall 1 where the liner top channel 6 is buried, and the inner diameter becomes smaller at the lower part, and the flat upper surface portion of the liner top channel 6 is formed in this stepped portion. The liner top channel 6 is buried so as to be exposed, bolts 9 are fixed on the flat part, and the intermediate partition wall 2 is placed and fixed on the flat part.

In such a conventional lined storage tank, there is no need to weld the support base 7 to the liner top channel 6, which simplifies the construction process, and reduces the number of welding points for the liner top channel 6, so the concrete wall 1 The occurrence of cracks can be suppressed to some extent. However, when welding the backing metal 8 and the lining plate 3 to the liner top channel 6, the liner top channel 6 is deformed, and the liner top channel 6
The flat upper surface of the concrete wall 1 may peel off from the concrete wall 1, or cracks may occur in the concrete wall 1.

Workers may work on the upper side of the intermediate partition wall 2, and as mentioned above, if a crack occurs near the middle partition wall 2 installation of the concrete wall 1, liquid may be scattered in this work area due to some kind of error. In such a case, liquid may infiltrate into the concrete wall 1 through the cracks and leak to the outside.

In addition, such a lined storage tank is equipped with a leak detector (not shown) that detects leakage from the lining, and such leakage of liquid from above the intermediate partition wall 2 may be mistaken for leakage from the lining. There are times when it can be broken. In addition, such cracks require a great deal of cost and effort to repair.
Moreover, there are problems such as it is difficult to confirm whether or not this crack has been sealed by the thorn metal.

[Object of the invention] The present invention has been made in response to such conventional circumstances,
The installation of the lining storage tank on the intermediate wall prevents the occurrence of cracks in the concrete wall, and also prevents the liquid from penetrating into the concrete wall even if liquid is accidentally scattered into the space above the intermediate wall. The purpose of the present invention is to provide a lined storage tank that can prevent external leakage.

[Summary of the Invention] That is, the present invention provides a storage tank main body composed of a concrete wall, an intermediate partition wall that vertically divides the interior of the storage tank main body, and an inner surface of the concrete wall forming a space below the intermediate partition wall. a lining plate that is airtightly fixed; and a liner that is embedded in a stepped portion formed on the inner surface of the concrete wall that forms the side surface of the storage tank body, and the lining plate is fixed to the side surface for supporting the intermediate partition wall on the upper side. In the lined storage tank equipped with a top channel, a liner top channel support part extending upward is formed at the end of the concrete wall that constitutes the side surface of the upper flat part of the liner top channel, thereby preventing cracks in the concrete wall. This prevents liquid from leaking from the upper part of the middle partition wall.

[Embodiment of the Invention] Fig. 1 shows a main part of an embodiment of a lined storage tank of the present invention, and in the figure, reference numeral 1 indicates the inner part of the concrete wall forming the side surface.

This concrete wall 1 has a stepped portion below which the diameter of the internal space becomes smaller, and a liner top channel 6 made of stainless steel fixed to a base material 5 is formed on the upper surface of this stepped portion. It is buried so that the flat part is exposed. Also, the concrete wall 1 on the flat top surface
A liner top channel support part 13 made of stainless steel is formed on the side, and this liner top channel support part 13 is buried in the concrete wall 1 so that one inner plane is exposed. Further, a port 9 is fixed to the flat upper surface of the liner top channel 6, a packing 10 and a washer 11 are inserted into the bolt, and the intermediate partition wall 2 is fixed with a nut 12. Further, a backing metal 88 and a lining plate 3 are fixed to the side flat portions of the liner top channel 6 by welding.

In the lining storage tank of the present invention configured as described above,
Since the liner top channel support part 13 is formed at the end of the flat upper surface of the liner top channel 6 on the side of the concrete wall 1, it is also possible to fix the backing metal 8 and the lining plate 3 to the liner top channel 6 by welding. The liner top channel support part 13 suppresses the deformation caused by the heat, thereby making it possible to prevent the concrete wall 1 from cracking.

Furthermore, even if liquid is splashed on the upper side of the intermediate partition wall 2, the liner top channel support portion 13 can prevent the liquid from penetrating into the concrete wall 1 and leaking to the outside.

FIG. 2 shows the main parts of another embodiment of the lining storage tank of the present invention, and in the figure, reference numeral 14 indicates a liner top channel support part made of stainless steel and provided with an overhang part. As shown in FIG. 3, the overhang portion of the liner top channel support portion 14 is formed to have a straight portion on substantially the same plane as the flat side portion of the liner top channel 6. By fixing the portion to the formwork 15, positioning when forming the concrete wall 1 can be easily performed. It should be noted that, except for the above points, this embodiment is the same as the previous embodiment, so the same parts are given the same reference numerals and redundant explanation will be omitted.

Like the lining reservoir in this embodiment, the same effect as in the previous embodiment can be obtained no matter what shape the liner top channel support part 14 has, and by changing the shape, it can be It is also possible to simplify the process.

[Effects of the Invention] As described above, in the lined storage tank of the present invention, a stepped portion is arranged inside the concrete wall that forms the side surface, and the liner top channel buried in this stepped portion has a liner top channel at the end on the concrete wall side. By forming a liner top channel support section that extends upward, it is possible to prevent the occurrence of cracks in the concrete wall, and even in the event of an accident where liquid is splashed into the space above the intermediate partition wall, this liquid will be prevented from leaking to the outside. Leakage can be effectively prevented. .

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing the main part of one embodiment of the lining storage tank of the present invention, FIG. 2 is a cross-sectional view showing the main part of another embodiment of the lining storage tank of the present invention, and FIG. Fig. 2 is a longitudinal sectional view showing the construction process of the embodiment shown in Fig. 4, Fig. 4 is a longitudinal sectional view showing the lined storage tank, Fig. 5 is a longitudinal sectional view showing the main parts of a conventional lining storage tank, and Fig. 6 is a longitudinal sectional view showing the conventional lining storage tank. FIG.

Claims (1)

[Claims] (1) A storage tank body composed of a concrete wall, an intermediate partition wall that vertically divides the interior of the storage tank main body, and a lining plate airtightly fixed to the inner surface of the concrete wall that forms a space below the intermediate partition wall. and a liner top channel that is buried in a stepped portion formed on the inner surface of the concrete wall that forms the side surface of the storage tank body, has a flat portion on the upper surface for supporting the intermediate partition wall, and has the lining plate fixed to the side surface. A lined storage tank comprising: a liner top channel support portion extending upward is formed at an end of the upper flat portion of the liner top channel on the side of the concrete wall that constitutes the side surface.