JPS6231435Y2 - - Google Patents

Description

[Detailed Description of the Invention] Generally, in a liquid storage tank, the inner surface of the storage tank is usually lined to prevent leakage of the stored liquid and to facilitate cleaning of the inner surface of the storage tank.

In addition, a large number of equipment and devices are installed on the inner surface of the storage tank, and as shown in Figures 1 and 2, the support material 1 that supports them is welded to an embedded plate 2 that is embedded in the concrete in advance. Can be installed by twisting. This embedded board 2 is set to be located on the same plane as the concrete part 3, and a lining board 4 is provided with an opening to which the support 1 is attached.
is laid on the embedded plate 2, and both 4 and 2 are fillet welded 5 to complete the entire lining of the storage tank. In addition, in order to separate the welded part between the embedded board 2 and the lining board 4 from the concrete part 3 and prevent the negative influence from the concrete part 3, an isolation groove 6 is installed on the back side of the embedded board 2 in advance at the factory. is arranged,
The isolation groove 6 can also be used as a detection groove for detecting liquid leakage in the unlikely event of leakage.

Storage tanks used in nuclear power plants, etc., contain radioactive liquid, and for periodic inspections, the liquid is drained and the inside of the storage tank is maintained and inspected. The area forms a recessed area, and liquid accumulates in this area, increasing the amount of radiation exposure for decontamination workers. In addition, the lining plate and the embedded plate are fillet welded, and it is necessary to polish the welded part in order to improve the decontamination effect, but this polishing process takes time and further increases the temperature of the stored liquid. If this happens, stress will be concentrated on the structure and this will lead to loss of soundness.

In addition, the isolation groove 6 for separating the welded part from the concrete part needs to be led to the isolation groove 7 of the general welded part, which requires complicated on-site connection work due to the structural difference between the two parts 6 and 7. .

The present invention was proposed to eliminate such drawbacks, and is a device or support in which an isolation groove is provided on the stepped surface of the end, which is formed by cutting out a thickness equal to the thickness of the lining plate. An embedded board for mounting the material is fixed so that the stepped portion is located on the same surface as the inner circumferential concrete surface of the storage tank, and a lining plate layered on the same concrete surface is laid on the stepped portion of the embedded plate. In addition, the present invention relates to a lining structure for a liquid storage tank characterized by being butt-welded to the embedded plate.

In this invention, the end of the embedded board is formed into a stepped part with a thickness equal to the thickness of the lining board, and is fixed so that the stepped part is located on the same plane as the inner circumferential concrete surface of the storage tank. Therefore, the embedded board is not buried in the concrete part so that its surface is on the same plane as the concrete surface of the storage tank, as in the past, but it is placed so that it protrudes into the tank by the thickness of the board from the same surface. Since the embedded plate and the lining plate laid on the end step are butt welded, there is no formation of a recess where the liquid accumulates in the storage tank. , the welded part becomes flat, making decontamination polishing possible and reducing the polishing time. Furthermore, by eliminating fillet welds, there is no risk of thermal stress concentration occurring, and a structurally sound storage tank lining structure can be constructed. Since an isolation groove is provided, there is no need to install an isolation groove on the back side of the embedded board, and the connection shape to the general isolation groove is simplified.
This invention reduces on-site man-hours, and is applicable to fuel handling tanks and radioactive liquid holding tanks for nuclear plants, buried tanks for chemical plants and general plants, underground underground tanks for oil and gas storage, etc. It is something.

The present invention will be described below with reference to the illustrated embodiments.

Embedded board 1 for mounting equipment or support material 11
2 is a stepped portion 12a whose end is cut out in advance at the factory by a thickness equal to the thickness of the lining plate.
, and an isolation groove 12b is provided on its surface.

The embedded board 12 is fixed to the concrete part 13 of the liquid storage tank so that the stepped part 12a is located on the same surface as the concrete surface 13a. Therefore, the embedded plate 12 is fixed to the concrete part 13 in a state in which it protrudes into the tank from the concrete surface 13a by the thickness of the lining plate. 14 in the diagram
is anchor hardware.

Next, the lining plate 15 is placed on the concrete surface 13.
a, and the end thereof is attached to the embedded plate 1.
The lining plate 15 and the embedded plate 12 are integrated by laying it on the stepped portion 12a of No. 2 and butt welding 16 to the embedded plate 12, thereby forming a lining without recesses and fillet welds in the storage tank. It is something to do.

To protect the butt weld, the stepped portion 12a
The isolation groove 12b formed in the groove also serves as a detection groove in case of an emergency.

In this way, there are no recesses in the storage tank, and in particular, there are no standing water areas on the floor, which improves decontamination performance and reduces the amount of radiation exposure during decontamination work.
In addition, by eliminating fillet welds, there is no risk of thermal stress concentration, making it possible to construct a more structurally sound lining structure for storage tanks. This makes it possible to shorten the polishing time.

Furthermore, by providing an isolation groove in the stepped portion of the embedded board, there is no need to install an isolation groove on the back side of the embedded board, the shape of the connection to the general isolation groove is simplified, and the number of man-hours on site is reduced. It is something that

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional lining structure for a liquid storage tank, FIG. 2 is an enlarged view of the main part thereof, and FIG. 3 is a vertical cross-sectional view of an embodiment of the lining structure for a liquid storage tank according to the present invention.
Figure 4 is an enlarged view of the main part. 12...Embedded board, 12a...Stepped portion, 12b...
Isolation groove, 13... Concrete part, 15... Liner plate, 16... Butt welding.

Claims (1)

[Scope of utility model registration request] An embedded plate for mounting equipment or support material is provided with an isolation groove on the surface of the stepped part at the end by cutting out a thickness equal to the plate thickness of the lining plate, so that the stepped part is connected to the inner circumferential concrete surface of the storage tank. A lining board that is fixed so as to be located on the same surface and layered on the same concrete surface is laid on the stepped part of the embedded board, and
A liquid storage tank lining structure characterized by butt welding to the same embedded plate.