JPS5929510B2 - Corrosion-proof lining method for liquid tanks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anticorrosive lining method suitable for use in various chemical tanks used in electrolysis, plating, waste water treatment, waste gas treatment, etc.

Conventionally, liquid tanks that handle various corrosive chemicals are often made of concrete or iron, but in order to prevent corrosion caused by the chemicals, hard synthetic resin plates are glued and fixed to the inner wall of the liquid tank, or A through hole is provided in a hard synthetic resin plate and bolted together, or a box is assembled using hard synthetic resin plates, and the box is fitted into a liquid tank.

However, with the method of gluing or bolting a hard synthetic resin plate to the inner wall surface of the liquid tank, water leaks from the bolt holes, and peeling occurs due to thermal stress due to temperature changes and differences in expansion and contraction between the liquid tank and the lining. This resulted in cracks and other problems, resulting in poor durability.

In addition, in the method of assembling the box using hard synthetic resin plates,
Due to the expansion and contraction of the box body due to temperature changes and the difference in expansion and contraction between the box body and the liquid tank, the welded parts between the hard synthetic resin plates were damaged, and there was also a problem with durability. Furthermore, in either method, hard vinyl chloride resin plates are glued or bolted one by one at the site where the liquid tank is installed, or hard synthetic resin plates are welded to match the dimensions of the liquid tank to form a box. Assembling the body was complicated and required long hours of work.

The present invention solves the drawbacks of the conventional methods as described above, and provides a liquid tank that is extremely easy to construct, requires only a short time, and can complete a highly durable corrosion-resistant lining. The purpose is to provide a corrosion-resistant lining construction method.

The gist of the present invention is to install a lining body made of a chemically resistant and flexible synthetic resin in a shape that follows the inner wall surface of the liquid tank, The upper end of the lining body is fixed to the upper end of the side wall of the liquid tank, and a liquid heated to a temperature higher than the softening temperature of the synthetic resin is injected into the liquid tank in which the lining body is installed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A corrosion-proof lining construction method for a liquid tank characterized by softening the lining body and bringing the lining body into close contact with the inner wall surface of the liquid tank Next, specific embodiments of the present invention will be described with reference to the drawings.

In the figure, reference numeral 1 denotes a liquid tank filled with various chemical solutions, which is made of a concrete or iron box.

Reference numeral 2 denotes a lining body made of a highly chemical-resistant and flexible synthetic resin sheet, and is shaped to follow the inner wall surface of the liquid tank 1.

The lining body 2 is made of a flexible synthetic resin and is integrally formed by vacuum molding, pressure molding, or injection molding, or by gluing or heat-sealing the ends of a flexible synthetic resin sheet to form a liquid. It is preferable to form the shape along the inner wall surface of the tank 1. Since the lining body 2 is made of a flexible synthetic resin, it can be folded, stacked, stored and transported, and will not crack when folded. If the liquid tank 1 has a huge volume or is a long tank, the lining body 2 is divided into several parts, and the divided lining body 2 is attached to the inner wall surface of the liquid tank 1. The end portions may be glued or heat fused together to form an integral piece while being installed along the . As the lining body 2,
Soft or semi-hard vinyl chloride resin, polyethylene,
Synthetic resins such as polypropylene can be used.
The lining body 2 is installed along the inner wall surface of the liquid tank 1, its upper end protrudes into the soil beyond the upper end of the side wall of the liquid tank 1, and is folded back.
The upper end of the side wall of the liquid tank 1 may be rolled up.

The upper end of the lining body 2 is fixed to the upper end of the side wall of the liquid tank 1. In order to fix the upper end of the lining body 2 to the upper end of the side wall of the liquid tank 1, for example, an anchor bolt 3 driven into the side wall of the liquid tank 1 is inserted into a through hole in the lining body 2, and a nut is inserted. However, if the lining body 2 is flexible,
If a load is applied, it may break from the through hole, so
It is best to press the area around the hole using a button. 4
is a fitting body that fixes the lining body 2, is made of hard vinyl chloride resin, fiber-reinforced synthetic resin, etc., has a U-shaped cross section, and fits the upper end of the lining body 2 and liquid tank 1. Then, the upper end of the lining body 2 can be fixed.

Also, the fitting body 4 is transparent. When a hole is provided and the anchor bolt 3 is inserted through it, it acts as a packing. Reference numeral 5 denotes an adhesive layer, which is provided on the back surface of the lining body 2, and the upper end of the lining body 2 is connected to the liquid tank 1.
It is fixed to the upper end of the side wall of the

The adhesive layer 5 is formed by applying an adhesive to the back surface of the lining body 2 or by pasting a double-sided adhesive tape. By forming the adhesive layer 5 at a position on the back surface of the lining body 2 corresponding to the vicinity of the liquid level of the chemical liquid in the liquid tank 1 and fixing it to the side wall of the liquid tank 1 at this position, for example, a heated chemical liquid can be applied. When handled, the lining body is heated near the liquid level of the chemical solution, and the portions not subject to liquid pressure can be prevented from swelling and becoming easily damaged. The method of fixing the lining body 2, the method of using the anchor bolts 3 and the fitting body 4, or the method of forming the adhesive layer 5 described above may be used alone or in combination. The above methods may be combined.
The thickness of the synthetic resin sheet constituting the circumference and lining body 2 is 1 mm.
A suitable thickness is about 3 mm.

By installing the lining body 2 on the inner wall surface of the liquid tank 1 in this way, the liquid tank 1 itself is protected from corrosion by the chemical solution, but the lining body 2 adheres to the fine irregularities of the liquid tank 1. In the present invention, the upper end of the lining body 2 may be easily damaged by the liquid pressure due to gaps remaining at the corners of the liquid tank 1. is fixed to the upper end of the side wall of the liquid tank 1, and then a liquid heated to a temperature higher than the softening temperature of the synthetic resin of the lining member 2 is poured into the liquid tank 1 in which the lining member 2 is installed.

For example, when the lining body 2 is made of semi-hard vinyl chloride resin, it is preferable to fill the liquid tank 1 with hot water at a temperature of 70.5 to 100°C. By injecting heated liquid into the liquid tank 1 in which the lining body 2 is installed, the lining body 2 is softened, and liquid pressure is applied, so that the lining body 2 is pressed against the inner wall surface of the liquid tank 1. Closely attached. However, if the synthetic resin of the lining body 2 becomes too soft by filling the liquid tank 1 with hot water, hot water may simply be sprayed onto the lining body 2. According to the present invention, a lining body made of a highly chemical-resistant and flexible synthetic resin is installed along the inner wall surface of the liquid tank, and the lining body is formed along the inner wall surface of the liquid tank. Since the upper end of the body is fixed to the upper end of the side wall of the liquid tank, hard synthetic resin plates can be glued or bolted one by one to the inner wall of the liquid tank, as in the conventional method, or hard synthetic resin plates can be attached at the site. There is no need to assemble synthetic resin plates to form a box, and construction can be completed in an extremely short time.

Furthermore, since the lining is made of a flexible synthetic resin, the lining can be folded and stacked in advance for convenient transportation or storage. According to the present invention, since the lining body installed in the liquid tank is made of flexible synthetic resin, the lining body itself can absorb thermal stress due to temperature changes, and it is extremely durable as it does not cause cracks or the like. A highly corrosion-resistant lining is obtained.

Furthermore, by injecting a liquid heated to a temperature higher than the softening temperature of the synthetic resin of the lining body into the liquid tank in which the lining body is installed, the lining body is softened and the lining body becomes liquid. Because it is placed in close contact with the inner wall of the tank, the lining may be lifted up from the inner wall of the tank and damaged, or the upper end of the lining and the side wall of the tank may be damaged due to the hydraulic pressure of the chemical solution filling the tank. This prevents the inner liner from detaching from the liquid tank due to load being applied to the portion that is fixed to the upper end.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing →1 of the lining body and liquid tank used in the anti-corrosion lining construction method for a liquid tank of the present invention, and Fig. 2 is a cross section illustrating the anti-corrosion lining construction method for a liquid tank of the present invention. It is a diagram.

Claims (1)

[Scope of Claims] 1. A lining body made of a highly chemical-resistant and flexible synthetic resin and shaped to follow the inner wall surface of the liquid tank is installed along the inner wall surface of the liquid tank. By fixing the upper end of the lining body to the edge of the side wall of the liquid tank, and injecting a liquid heated to a temperature higher than the softening temperature of the synthetic resin into the liquid tank in which the lining body is installed. A corrosion-proof lining construction method for a liquid tank, characterized by softening the lining body and bringing the lining body into close contact with the inner wall surface of the liquid tank. 2. The anti-corrosion lining construction method for a liquid tank according to claim 1, characterized in that the upper end of the lining is fixed to the edge of the side wall of the liquid tank with an adhesive.