JPS6134311Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a lined storage tank, such as a large concrete storage tank, which has a structure in which the surface of a concrete wall is double-lined with a metal lining plate and a shield plate.

[Technical background of the invention and its problems]

Lined storage tanks, in which the walls of concrete storage tanks are lined with metal, are widely used, for example, in facilities that handle radioactive waste liquid related to nuclear power plants or in general chemical plants.

Below, with reference to Figure 1, we will explain the structure of a lined storage tank in which a concrete wall is double-lined with a lining plate and a shield plate, which is used, for example, in nuclear fuel storage pools in nuclear power plant facilities or radioactive waste liquid storage tanks. do.

That is, FIG. 1 partially shows only the main part of the lining storage tank. As is clear from FIG. It covers the entire wall of the building, as if it were a single board. Note that the reference numeral 6 in the figure indicates a reinforcing bar.

Here, the size of the lining plate 1 as a single unit is
The size is 1.5 m x 3 m or 2 m x 6 m, etc., and when the lining plate 1 and the shield plate 2 are welded together, they are welded and fixed via the backing metal 3 as described above.

Therefore, the backing metal 3 is fixed to the concrete 7 with the anchor bolts 5 via the base material 4.

However, in the case of a normal lining plate, in addition to the weld line at the connection part, a hole 10 is made in the lining plate 1 as shown in FIG. This prevents bulges.

The shield plate 2 shown in FIGS. 1A and 1B is usually made of carbon steel, which is inexpensive and has good workability, and is almost always made of a different material from the lining plate 1.

Therefore, the plug welded portion 11 is welded with different materials, which has the drawback of making welding difficult.

Furthermore, if the shield plate 2 is made of the same material as the lining plate 1, for example, stainless steel, it will be very expensive and not industrially reasonable.

Furthermore, in comparison with other methods such as providing a backing metal 3 at the plug weld 11 as shown in FIG. 1C, it is necessary to provide a base material 4 in addition to the backing metal 3, and therefore it is necessary to cut the shield plate 2 thinly, which is complicated and time-consuming.

[Purpose of invention]

This invention was devised to eliminate the drawbacks of the conventional lined storage tank described above, and it was created by making a hole in the shield plate, preparing a backing plate made of the same material as the lining plate, and welding the backing plate and the lining plate. To provide a lining storage tank which has good weldability and enables effective fixing of a lining plate.

[Summary of the idea]

A lined storage tank consisting of a concrete wall double-lined with a lining plate and a shield plate, characterized in that a backing plate made of the same material as the lining plate is provided on the back side of the lining plate, and the backing plate and the lining plate are fixed by welding. This is a lined storage tank.

[Example of idea]

An embodiment of the present invention will be explained below with reference to FIG.

Note that the same parts in FIG. 2 as in FIG. 1 are indicated by the same reference numerals, and the explanation of the overlapping parts will be omitted.

In FIG. 2, a shield plate 2 is in contact with the back surface of the lining plate 1.

A through hole 12 is provided in the shield plate 2.

A backing seat 8 having a flange portion 8a is inserted into the through hole 12.

A through hole 13 is provided in the center of the backing seat 8.

The backing plate 8 is made of the same material as the lining plate 1.

Insert the backing seat 8 into the through hole 12 of the shield plate 2,
Through hole 13 in the center of lining plate 1 and backing plate 8
and plug weld 14.

Thereafter, the entire circumference of the backing plate 8 is welded 15 to the shield plate 2 to fix the lining plate 1, the shielding plate 2, and the backing plate 8.

Thus, the lining plate 1 and the shield plate 2 are fixed, and a stud dowel (not shown) is appropriately attached to the shield plate 2 and fixed with concrete.

Figure 3 shows another embodiment of the present invention.
A female screw 16 is provided in the through hole 12 of the shield plate 2, and a female screw 17 is screwed into the female screw 16.
By screwing in the annular backing seat 18 having
8 and the shield plate 2 are fixed.

Then, the lining plate 1 and the backing plate 18 are plug welded 1 using the through hole 13 in the center of the backing plate 18.
4 and fixed it.

In addition, the code|symbol 19 is a groove|channel for a screwdriver.

[Effect of idea]

The present invention described above has the following effects.

(1) Since there is no need to drill holes in the lining plate for plug welding, there is no need to move the lining plate to make holes, and problems such as damage to the surface of the lining plate can be avoided. .

(2) Drilling holes in a carbon steel shield plate is easier than drilling holes in a stainless steel lining plate, and requires less time.

(3) Since the welded part by plug welding does not penetrate the lining plate, problems such as leakage of liquid in the lining storage tank to the outside due to welding defects will not occur.

(4) Since the welds are not visible on the surface of the lining plate, there is no need to grind the surface of the welds to a smooth finish, which improves the appearance and saves time.

(5) By making the lining plate and backing plate of the same material, weldability becomes good and welding becomes easy.

(6) Compared to the case where a backing metal is provided at the location of plug welding, the structure of the base material is simplified, and the location and location of plug welding can be selected arbitrarily.

[Brief explanation of the drawing]

Figure 1 is a diagram for explaining a conventional lined storage tank, where A is a cross-sectional view showing only the main parts of the tank, B is a cross-sectional view of the plug welded part, C is a cross-sectional view of the welded part, and Figure 2 is a cross-sectional view of the main part of the tank. A sectional view of a plug welded part in an embodiment of the lining storage tank according to the invention, FIG. 3A is a sectional view showing a plug welded part in another embodiment of the invention, and FIG. It is. 1... Lining plate, 2... Shield plate, 3...
...backing metal, 4...base material, 5...anchor bolt, 6...reinforcement, 7...concrete, 8,18
...Backing counter, 13...Through hole, 14...Plug welding.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a lined storage tank consisting of a concrete wall double lined with a lining plate and a shield plate, the back side of the lining plate is made of the same material as the lining plate and has a through hole in the center. What is claimed is: 1. A lining storage tank characterized in that a backing seat is provided, a through-hole portion of the backing seat is plug-welded to the lining plate, and the shield plate and the backing seat are fixed. (2) The lined storage tank according to claim 1, wherein the shield plate and the backing plate are fixed by screwing, welding, or caulking. (3) The lining storage tank according to claim 1, wherein the backing seat is formed into an annular body.