JPH0474596A - Aeration tank - Google Patents

Abstract

PURPOSE:To form an inexpensive aeration tank excellent in earthquake resistance and simple to assemble and disassemble by forming a flexible structure not connecting an outer peripheral side wall and a central fixing stand and pressing a rubber sheet to an installation surface such as the ground and the inner surface of the outer peripheral side wall by water pressure. CONSTITUTION:An outer peripheral side wall 4 is implanted in a loop-shape concrete base 3 and a plurality of foundation piles are driven in the center part of the conical circular installation surface surrounded by the outer peripheral side wall 4 and a flat disc-shape concrete fixing stand 5 is anchored thereon. A rubber sheet 6 with thickness of about 1 mm is closely applied to the bottom surface from the fixing stand to the inner perphery of the outer peripheral side wall 4 and the inner peripheral surface of the outer peripheral side wall 4 to form a tub-shape tank body. A ring-shape concrete press plate 7 is placed on the fixing stand 5 so as to press the rubber sheet 6 and the ring- shape aeration nozzle 8 connected to an air supply pipe 9 is arranged on the press plate 7. A deodorizing oxygen supply device 11 is arranged to the central part in the tank body at the position equal to the surface of the waste water in the tank.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an aeration tank that has a structure in which oxygen is spouted into the liquid from the bottom of the tank, and is applicable to, for example, industrial wastewater treatment and large-scale aquaculture. It is.

<Prior art> In general, sewage and organic wastewater are screened and settled in a settling tank to remove coarse impurities and solids, and then the overflow water is led to an aeration tank, where it is diffused using an aeration method using an aeration pipe or a rotary blade. Aerated by mechanical stirring method. Most of the conventional aeration tanks used in such wastewater treatment equipment are made of reinforced concrete or unreinforced concrete.

<Problems to be Solved by the Invention> However, since the concrete aeration tank is installed on the ground, once it is installed, it is not easy to relocate or remove, and the equipment cost is high. However, larger structures had the disadvantage that earthquakes and long-term ground movements could cause cracks in the concrete, causing water leakage.

The present invention solves these problems by creating a new aeration system that has a flexible structure, has excellent earthquake resistance, has significantly lower equipment costs, and can be easily removed or relocated when necessary. The purpose is to provide a tank.

Means for Solving the Problems> In order to achieve the above object, the present invention lays a loop-shaped outer peripheral base on an installation surface such as the ground, and plants an outer peripheral side wall of a predetermined height on it, A flat fixed base is installed in the center of the loop on the installation surface, and a rubber sheet is covered without any gaps on the bottom surface from the fixed base to the inner periphery of the loop-shaped outer peripheral base and the inner peripheral surface of the upper air peripheral side wall. A roughly tub-shaped tank is formed as a whole, and a concrete cathedral board is placed on the above-mentioned fixed base with a rubber sheet in between, and an aeration nozzle is arranged and fixed on the holding board. It is characterized in that an air supply pipe that communicates the nozzle with an oxygen supply source installed outside the tank is piped along the inner surface of the rubber sheet.

Further, it is preferable that the upper surface of the fixed base is lower than the loop-shaped outer peripheral base.

<Function> The outer peripheral side wall and the central fixed base are not connected and have a flexible structure, so it has excellent earthquake resistance.

Since the rubber sheet is pressed against the installation surface such as the ground and the inner surface of the outer peripheral side wall by water pressure, no adhesive or fixing means is required.

Further, the concrete catechism plate is also pressed onto the fixed base by its own weight and water pressure, and the rubber sheet is held between the press plate and the fixed base. Therefore, the rubber sheet has no mounting holes or the like, and there is no risk of water leakage.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is a plan view thereof. This embodiment shows the case where the ground is the installation surface 1, and foundation piles 2 made of pine piles are driven under the installation surface 1, and a loop-shaped outer peripheral base 3 is laid on top of it with concrete. There is. This outer peripheral base 3 has a width of 3
It has a cross-sectional area of 00 mm and a depth of 150 mm, and has a circular shape with an inner diameter of about 14 m. On this outer peripheral base 3, an iron outer peripheral side wall 4 with a height of about 3500 mm is installed.

The circular installation surface 1 surrounded by the outer peripheral side wall 4 has a forest-like shape with the center part about 1 meter lower than the outer peripheral part. 2
A concrete fixing table 5 in the shape of an oblate disk with a diameter of 5 m is installed on top of the concrete.

The bottom surface from the fixing base 5 to the inner circumference of the loop-shaped outer circumferential side wall 4 and the inner circumferential surface of the outer circumferential side wall 4 are covered with a rubber sheet 6 with a thickness of about 1 mm without any gaps, so that the tank has an approximately tub-like shape as a whole. is formed. Note that the rubber sheet 6 is attached to the outer peripheral side wall 4.
It is folded back to the outside by a length of about 0.5 m from the top end.

A ring-shaped concrete dome plate 7 or a rubber sheet 6 is placed on the fixed table 5, and a ring-shaped aeration nozzle 8 is placed on the holding plate 7. It is fixed by an anchor bolt (not shown) fixed to the. An air supply pipe 9 connected to the aeration nozzle 8 is piped along the inner surface of the rubber sheet 6 to lead out of the tank, and is connected to a blower 10 as an oxygen supply source. Further, a deodorizing oxygen supply device 11 is disposed at the center of the tank at a level above the level of the liquid such as waste water filling the tank.

Unlike concrete aeration tanks, this aeration tank can be easily assembled at low facility costs and in a short construction period, and when removed or relocated, it can be easily disassembled and moved because it is an assembled type.

In the above embodiment, the loop-shaped outer circumferential base 3 has a circular planar shape, but it can be configured to have any shape depending on the installation location, such as a square. Further, a rubber plate may be provided between the outer peripheral base 3 and the ground to further improve earthquake resistance.

Furthermore, the installation surface is not limited to the ground, but can also be installed inside a building, on the roof of a building, etc.

<Effects of the Invention> As described above, according to the present invention, most of the bottom surface that receives the most water pressure uses the ground, and the surface is simply covered with a rubber sheet, so the material cost is significantly reduced. In addition, the total weight is significantly reduced and it can be manufactured at low cost, and since it is an assembly type, it can be easily disassembled and moved when removed or relocated.

Furthermore, since it has a flexible structure in which the outer peripheral side wall and the central fixed base are not connected, it has extremely excellent earthquake resistance.

Furthermore, there are no openings such as mounting holes in the rubber sheet, so there is no risk of water leakage, and it is highly durable.
In addition to the above-mentioned excellent earthquake resistance, it can be used stably for a long period of time despite its simple configuration.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is a plan view of FIG. 1. 7... Concrete dossier board 8... Aeration nozzle 9... Air supply pipe 10... Blower (oxygen supply source) 1... Installation surface 3... Loop-shaped outer peripheral base 4... ...Outer peripheral side wall 5...Fixing base 6...Rubber sheet

Claims (2)

[Claims] (1) Laying a loop-shaped peripheral base on the installation surface such as the ground,
An outer circumferential side wall of a predetermined height is planted on top of that, and a flat fixed base is installed at the center of the loop-shaped installation surface, and the bottom and top surfaces extending from the fixed base to the inner periphery of the loop-shaped outer circumferential base are A rubber sheet is coated on the inner peripheral surface of the outer circumferential side wall without any gaps to form an approximately tub-shaped tank as a whole, and a concrete holding plate is placed on the above-mentioned fixing table with the rubber sheet sandwiched in between, and the holding plate is placed on the holding plate. An aeration tank characterized in that an aeration nozzle is arranged and fixed in the tank, and an air supply pipe is arranged along the inner surface of the rubber sheet to connect the aeration nozzle to an oxygen supply source installed outside the tank. (2) The aeration tank according to claim (1), wherein the upper surface of the fixed base is configured to be lower than the loop-shaped outer peripheral base.