JP2002235362A - Tub having buoyancy measure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means for reducing the influence of buoyancy without losing the temporary storage of a storage and infiltration tank. SOLUTION: In a tank buried underground as a storage space covered with a plastic sheet for a part of or whole of a structure assembled longitudinally and laterally by plastic molding members, crushed stones are piled up in the upper portion of the structure as a measure against buoyancy, the crushed stone portion and the structure are combined together or separately covered with the seat thereby providing the buoyancy measure for the tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention belongs to the technology of a tank for storing water. More specifically, it belongs to a buoyancy countermeasure technology for a storage tank provided in the soil for effective use of rainwater and a storage tank for temporarily storing rainwater during heavy rain.

[0002]

2. Description of the Related Art A tank formed by assembling a plastic molded body vertically and horizontally and burying it in the ground to serve as a storage space is used.
26648, Tokuhei 4-35580 and many others. These tanks are made of sheets (protective sheets, water-permeable sheets, water-impervious sheets, etc.) on a basic surface constructed of crushed stone.
, The above-mentioned structure is installed on a sheet, and the side and top of the structure are appropriately covered with sheets (protective sheet, water-permeable sheet, water-blocking sheet, etc.) according to the purpose, and a storage tank,
It was an infiltration tank or a storage infiltration tank that also had storage infiltration.

[0003] When the groundwater level rises, the above-mentioned storage tank or storage infiltration tank (hereinafter collectively referred to as storage and infiltration tank) is used to store the groundwater level and the weight including the water stored in the storage and infiltration tank. In some cases, the buoyancy of the storage infiltration tank is greater than the weight of the storage infiltration tank,
There is a problem that the storage infiltration tank itself floats up. In particular, tanks with a structure in which a FRP or plastic molded body assembled vertically and horizontally is used as the tank space of the storage infiltration tank are smaller than the reinforced concrete storage tanks, so the effect of buoyancy on the tank is small. Becomes larger.

In order to reduce the influence of buoyancy,
Increase the amount of embankment applied to the upper part of the storage infiltration tank, or, as disclosed in Japanese Patent Application No. 11-160286, provide a recess in the upper space of the storage infiltration tank and fill it with a filler with a large specific gravity to fill the entire tank. A method has been proposed to increase the apparent specific gravity.

[0005] A method has been proposed in which the storage and infiltration tank is connected to the outside by a communication pipe, and the water level in the storage and infiltration tank and the groundwater level are matched using a float.

In the above method of increasing the apparent specific gravity, there is a problem that the storage amount including substantial temporary storage in the storage infiltration tank is reduced. In the method of adjusting the water level by the communication pipe, overflow water in an emergency is stored. There is a problem that space is lost by introducing groundwater, and the amount of temporary storage is also reduced.
When the groundwater level rises, it is often time to secure a space to temporarily store the overflow, because it is often caused by long rains. In such a case, if the groundwater level and the water level of the storage tank are combined to take measures against buoyancy, the original purpose of collecting overflow water and temporarily storing it may be impaired.

[0007]

SUMMARY OF THE INVENTION The present invention provides a means for reducing the effect of buoyancy without impairing the temporary storage amount of a storage infiltration tank.

[0008]

According to the present invention, (1) crushed stones are piled up on a tank buried in the ground to prevent buoyancy, and the crushed stones are covered with a sheet to make a crushed stone space a storage area. In a tank in which buoyancy measures are taken and (2) a tank in which a plastic molded body is assembled vertically and horizontally and a part or the entire periphery thereof is covered with a sheet and buried in the ground as a storage space, It is a tank in which crushed stones are stacked to prevent buoyancy, and the crushed stone portion and the structure are combined or separately covered with a sheet to prevent buoyancy.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, the present invention is a storage tank in which crushed stones are piled up on the storage tank to prevent buoyancy, the crushed stone part is made up of many sheets, and the crushed stone part is also made a storage space. If the crushed stone part is covered with a waterproof sheet, the crushed stone part also becomes a storage part,
If covered with a water-permeable sheet, the crushed stone part becomes a temporary storage part. This diagram is applicable to the case of a concrete storage tank.

As shown in FIG. 2, according to the present invention, a plastic molded body is combined vertically and horizontally to divide a space, and when the divided space is used as a storage tank or a storage infiltration tank, crushed stone is placed above the defined space. Is a storage tank in which both the crushed stone part and the divided space are covered with a sheet so that the crushed stone part and the divided space are covered with a sheet, and both the crushed stone part and the divided space part are a storage part or a temporary storage part. As in FIG. 1, if covered with the impermeable sheet, both the crushed stone portion and the divided portion can be used as the storage portion. If covered with a water-permeable sheet, both the crushed stone part and the partition part can be used as a temporary storage part. In order to prevent crushed stones from falling into the compartment space between the compartment space and the crushed stone portion, a large crushed stone is used, or the ceiling of the compartment space is covered with a ceiling plate having a water-permeable sheet or a watermark hole.

The present invention shown in FIG. 3 is to combine plastic molded products vertically and horizontally to divide a space, and when the divided space is used as a storage infiltration tank, crushed stones are piled up at the top of the section to prevent buoyancy. In this example, the crushed stone part and the section space are separately covered with a sheet. The figure shows an example in which the crushed stone part is covered with a water-impervious sheet to form a storage part, the divided space part is divided into two parts, the lower part is a storage part, and the upper part is a permeation part. Cover the bottom and its surroundings with a waterproof sheet to a predetermined height,
At least a predetermined height is covered with a water-permeable sheet to prevent earth and sand from flowing into the tank. It is also possible to cover the crushed stone part with a water-permeable sheet and make the crushed stone part a temporary storage part.

The porosity of a tank in which a plastic molded body is used as a space partitioning material for a storage and infiltration tank varies depending on the type of the molding material, but is generally 90%. About 35% porosity when used as
It is about. When crushed stone is applied to the upper part of the storage infiltration tank and used as a heavy stone, the crushed stone does not contribute to the storage space. However, by covering the crushed stone with a water-impervious sheet or a water-permeable sheet, the crushed stone not only becomes a heavy stone,
A 35% portion of the volume can be used as a temporary storage or storage space.

[0013] As shown in FIG.
Various proposals have been made. 4a and 4b show a case in which an upwardly projecting portion is provided on the bottom surface of the container to provide strong reinforcement.
FIG. 4c shows the connection of four containers. FIG. 4d is a pipe. FIG. 4e shows a frame. The present invention is not limited to these, and any molded body having a fixed shape can be used by combining it vertically and horizontally to define a space. An existing method can be used in combination depending on the type of the molded article.

According to the present invention, the crushed stone is applied to the upper part of the storage infiltration tank as a weight for preventing buoyancy, and the crushed stone layer is covered with a water-impervious sheet or a water-permeable sheet. The amount of storage increases because it contributes as a part.

[Brief description of the drawings]

FIG. 1 shows a first conceptual diagram of the present invention.

FIG. 2 shows a second conceptual diagram of the present invention.

FIG. 3 shows a third conceptual diagram of the present invention.

FIG. 4 shows an example of a plastic molded body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage permeation tank 2 Crushed stone layer 3 Impermeable sheet 4 Permeable sheet 5 Intake port 6 Water supply port

Claims (2)

[Claims] Claims: 1. A crushed stone is piled up on a tank buried underground to prevent buoyancy, and the crushed stone is covered with a sheet.
A buoyancy countermeasure tank characterized by a crushed stone space as a storage area. 2. A tank in which a plastic molded body is assembled vertically and horizontally and part or the entire periphery thereof is covered with a sheet and buried in the ground as a storage space, crushed stones are piled up on the structure to prevent buoyancy. A buoyancy-resistant tank, wherein the crushed stone portion and the structure are combined or separately covered with a sheet.