JPH07132294A - Septic tank having partition wall and its production - Google Patents

Abstract

PURPOSE:To provide a method capable of easily producing the septic tank having two independent cells delineated by partition walls by using small molds for FRP. CONSTITUTION:Four pieces of water containers 1 made of FRP (fiber reinforced plastic) each of which has a horizontal opening 3 atop the container and is provided with side wall surfaces 4 composed of planes, are used. The flange parts 2 of two pieces each of such water containers are butted against each other and the butt parts are joined by the FRP, by which a pair of the water cell containers having plane wall surfaces 4, 4 on one side are formed. The plane wall surfaces of a pair of such water cell containers are superposed and joined on each other and the peripheral edges of both plane wall surfaces in contact with each other are integrally joined to each other by the FRP, by which a pair of the independent water cells are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gray water purification tank made of fiber reinforced plastic (hereinafter referred to as FRP) and a method for producing the same, and particularly to a large volume septic tank having two chambers defined by partition walls. It is about.

[0002]

BACKGROUND OF THE INVENTION The present inventor has previously used a pair of settling tanks equipped with aeration equipment as a pretreatment device for a gray water purification device,
This pair of settling tanks is connected to a domestic wastewater source such as a kitchen via a switching valve, and the wastewater is guided to one of the settling tanks to separate sediments and suspended matters that should be sludge. while,
The other settling tank has been disclosed as a gray water purification tank that shuts off the source of gray water and aerates and decomposes sludge that has precipitated and separated before switching by the switching valve.

The period for alternately using the pair of settling tanks (septic tanks) is usually 6 months to 1 year except for special cold regions, and such a long period is set. By switching the settling tank and using it alternately,
In this settling tank, sludge that has been used for a certain period of time is separated,
By performing aeration treatment over almost the same period, most of the organic matter in the sludge is decomposed and the maintenance of the septic tank becomes extremely easy.

The septic tanks used for such purposes may be used by embedding two septic tanks, each of which is a separate body, but it requires a large installation space and the installation work becomes complicated. Therefore, an FRP septic tank integrally provided with a pair of purifying chambers (precipitation chambers) having substantially the same capacity is desirable. However, in the case of partitioning the inside of one FRP container by the partition wall, as shown in the figure, first, the box body 50 having an open upper surface is made by the FRP, and then the wall surface to be provided with the partition wall is opposed. A mounting bar 51 having an L-shaped cross section is fixed to the section.

Next, the FRP is installed between the mounting bars 51, 51.
The partition wall 52 made of a board is fixed, and the joint portion 53 of the partition wall 52 and the bottom plate 50a is covered and fixed by FRP from the left and right to be integrated with the bottom plate 50a.
The fixed wall between the partition wall 1 and the partition wall 52 is also covered and fixed by FRP to complete the partition wall. This is covered with a top plate 55 that closes the upper surface, and its peripheral portion is similarly subjected to FRP.
By adhering and fixing by, a septic tank having independent water chambers 61 and 62 is completed. 56 and 57 are water chambers 61 and 6 respectively.
It is the inspection port of 2, and this portion opens to the ground surface and is normally covered with a lid. Reference numeral 54 is an entrance / exit of waste water.

The above-mentioned manufacturing process is complicated, and the mounting bar 5
In the case of using angle steel, etc., in order to prevent corrosion, the fixing portion between the wall surface of the box body 50 and the mounting rail 51 and the fixing portion between the partition wall 52 and the mounting rail must be completely covered with FRP in order to prevent corrosion. Not only is it time-consuming, but the manufacturing of the box itself has a volume of 7 to 8 cubic meters. Even if it is assumed that the box is a cube, the length, width, and height are each 2 meters. Therefore, the molding die is large, the manufacturing work cannot be performed efficiently, it takes time, and the partition wall requires skill, so products with poor dimensional accuracy tend to occur. , There was a defect that the quality was not uniform.

[0007]

It is an object of the present invention to use a novel septic tank having two independent chambers defined by partition walls and a relatively small FRP mold that does not have manufacturing difficulties as in the prior art. Disclosed is a method for easily manufacturing an FRP septic tank having a large partition wall with high dimensional accuracy.

[0008]

According to a first aspect of the present invention, in an FRP water tank provided with a pair of independent water chambers separated by a partition wall, the two partition walls are in contact with each other in an overlapping state. The structure of the FRP septic tank is composed of FRP plates, and each of the two FRP plates is integrally joined to the inner surface of the water tank at its peripheral portion.

A second aspect of the present invention is the FRP septic tank defined in the first aspect, wherein a pair of independent water chambers separated by a partition wall are symmetrical with respect to each other. Each water chamber has a septic tank characterized by being provided with an inlet / outlet and an inspection port for the water to be treated.

The third gist of the present invention is to use four FRP water containers each having a horizontal opening on the upper surface and at least one of the side wall surfaces being a flat surface by using the same molding die. Created by the method, using each of the two water containers obtained,
The horizontal openings of each of the two water containers are butted, and the butted parts are joined by FRP to form a pair of water chamber containers having a flat wall surface on at least one side. Overlapping the flat walls,
A method for producing an FRP septic tank provided with a pair of independent water chambers, characterized in that the peripheral portions of both planar wall surfaces that abut each other are integrally joined by FRP. Hereinafter, the present invention will be described in detail based on examples.

[0011]

1 is a cross-sectional view of a steel plate forming die 30 for forming the septic tank of the present invention, one side surface 31 of which is a plane nearly vertical and the other three side surfaces 32, 32, 3
2 has a draft for removing the FRP molded product from the mold,
It has a tapered surface that expands downward. The lower ends of the three side surfaces 32 provided with the tapered surface form a series of U-shaped projecting edge portions 33 that project in the horizontal direction by a slight width. Reference numeral 35 denotes a support base on which the molding die is mounted and fixed.

The FRP water container 1 is manufactured by using the molding die 30. The manufacturing method is exactly the same as the known method. A mold release agent is applied to the surface of the molding die 30, and an uncured liquid polyester resin and a glass fiber cloth are alternately applied and laminated on the surface of the molding die. After curing, the water container 1 as shown in FIG. 2 is obtained by removing from the mold. This water container 1 is provided with a horizontal opening 3 surrounded by a U-shaped flange portion 2 on its upper surface, and a side wall surface 4 without the flange portion 2 forms a substantially vertical plane, and the other three sides Each of the wall surfaces 5, 6 and 6 has a taper surface which is inclined toward the inside of the container toward the peripheral edge of the bottom surface 7.

Four water containers 1 are prepared by the same method as described above. Next, using the two water containers 1 and 1, the flange portions 2 are butted against each other to form the vertical side wall surfaces 4 and 4.
Is made to be one plane, and the butted portion is joined by FRP. At this time, if the flange portions are preliminarily fixed with a thin rivet-like fastener, the work becomes easier. The method of joining by FRP is the same as the method of forming the water container 1, in which a polyester resin is applied over the joining portion, non-woven glass fibers are superposed on it, and further, a resin is applied and cured. Is repeated as necessary.

At this time, on the bottom surface 7 of one of the water containers,
It is desirable to provide the inspection opening 8. Inspection opening 8
For example, a plastic short cylindrical member 40 is fitted into an opening 8 formed in the bottom surface 7 of the water container 1, and a flange 41 protruding from the outer peripheral surface of the member 40 and a lower portion of the member 40 are provided. It is attached and fixed by the tightening ring 43 screwed to the male screw portion 42. 45 is a lid. Normally, the inspection opening 8 is
Since the diameter is large enough for the operator to pass through, it is preferable that the abutting portions of the water containers 1 and 1 are joined by FRP not only from the front side but also from the inside.

In this way, the water chamber container 10 is obtained by joining and integrating the pair of water containers with their horizontal openings 3 and 3 aligned. With respect to the other two water containers, another water chamber container 10 having exactly the same shape is completed by the same process. These two sets of water chamber containers 10,
As shown in FIG. 5, flat wall surfaces 11 and 11 made up of vertical surfaces are aligned and brought into contact with each other, as shown in FIG.
When the water chamber containers 10 and 10 are integrated by joining the peripheral portions 12, 12 of the water chamber chambers 11 and 11 by FRP in the same manner as in the case of creating the water chamber container 10, two planar chambers that contact each other F
A septic tank provided with a pair of independent water chambers separated by a partition wall composed of RP plates (11) and (11) is obtained.

The septic tank thus obtained is provided with an inlet / outlet port 48 for the water to be treated in each water chamber, if necessary. Like the inspection opening, this may be provided before the two water chamber containers 10 and 10 are combined and integrated. In the above examples, a combination of glass fiber and unsaturated polyester resin was shown as the FRP, but epoxy resin or the like may be used as the FRP, and the reinforcing fiber may be a chemical fiber generally used for FRP. Can be used together.

Further, as shown in FIG. 6, a pair of water chambers 1
When joining a and 1a, instead of joining the flange portions 2a to each other, first, the planar wall surfaces 4a and 4a are joined and integrated to obtain a pair of side wall surfaces 4a having an open upper surface. Two unitary moldings having two chambers partitioned by 4a are made. This integrally molded product can also be used in place of the conventional septic tank having a partition wall shown in FIG. 7.
If the flange portions 2a, 2a of the integrally molded product are overlapped and joined together, a septic tank as shown in FIG. 5 can be obtained. In this case, of course, the condition is that the inspection opening that also serves as the joining work port is created in advance in one of the integrally molded products, and then the joining is performed.

[0018]

[Effect] The method for manufacturing the septic tank of the present application has the following excellent effects. That is: 1. It is possible to manufacture a septic tank several times as large as that using only one small mold. 2. Even if the size of the finished product is much larger than the worker's height, most of the work such as installation of the inlet / outlet pipe and inspection opening is performed with water of half the height or less. Since it can be processed at the stage of a container or a water chamber container, the work is easy and efficient. 3. A partition wall that requires skill and time to manufacture can be easily created, and the dimensional accuracy of the product is high. The double-layered partition wall enhances the pressure resistance of the septic tank, has high impact resistance, significantly improves the product strength, and is easy to manufacture and can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional explanatory view showing an example of a molding die for carrying out a manufacturing method according to the present invention.

FIG. 2 is an explanatory view of a water container, which is a constituent member of the septic tank according to the present invention, as viewed obliquely from above.

FIG. 3 is an explanatory view of a side view of a water chamber container in which a pair of the water containers of FIG. 2 are joined and integrated.

FIG. 4 is a sectional explanatory view showing a detailed structure of an inspection opening.

FIG. 5 is an explanatory view showing an example of a septic tank according to the present invention as seen from diagonally above.

FIG. 6 is an explanatory view showing another embodiment of the method of the present application.

FIG. 7 is an explanatory diagram showing an example of a conventional technique.

[Explanation of symbols]

 1 water container 2 flange part 3 horizontal opening 4 vertical side wall surface 8 inspection opening 10 water chamber container 20 septic tank 30 mold for FRP

Claims (4)

[Claims] 1. A fiber reinforced plastic having a pair of independent water chambers separated by a partition wall (hereinafter, referred to as FRP).
In the water tank, the partition wall is composed of two FRP plates that are in heavy contact with each other, and each of the FRP plates is integrally joined to the inner surface of the water tank at its peripheral portion. Characteristic FRP septic tank. 2. An independent water chamber separated by a partition wall,
The septic tank according to claim 1, wherein the partition walls are symmetrical with each other, and each water chamber is provided with an inlet / outlet port and an inspection port for the water to be treated. 3. An FRP water container having a horizontal opening on the upper surface and at least one of the side wall surfaces formed of a flat surface is prepared by an ordinary method using the same mold and is obtained. A pair of water chambers having a flat wall surface on at least one side by using two of the water containers and abutting the horizontal openings of each of the two water containers and joining the abutting portions by FRP. A pair of independent water chambers, characterized in that a container is made, the planar wall surfaces of the pair of water chamber containers are brought into contact with each other, and the peripheral edge portions of the planar wall surfaces contacting each other are integrally joined by FRP. FRP septic tank manufacturing method. 4. An inspection port is opened in each of the water chamber containers so that the inner surface of the abutting portion of the horizontal opening of the water chamber container,
4. The FRP is integrally joined through the inspection port.
Manufacturing method.