JP2020089839A - Water treatment device - Google Patents

Abstract

To provide a water treatment device which produces no waste materials and is environment-friendly and inexpensive.SOLUTION: In the water treatment device including partition plates for partitioning an inside from an outer hull, the outer hull is divided into at least two of an upper outer hull and a lower outer hull, the upper outer hull and the lower hull have respectively flange parts for bonding; a height of the upper outer hull is 1/3 or less and 1/5 or more of that of the lower outer hull, and the upper outer hull includes at least two kinds of a first upper outer hull and a second upper outer hull, and the lower outer hull is common to them; and at least two kinds of a first water treatment device in which the lower outer hull is combined with the first upper outer hull and a second water treatment device in which the lower outer hull is combined with the second upper outer hull can be produced.SELECTED DRAWING: Figure 1

Description

The present invention relates to a water treatment device that treats sewage discharged from a detached house, an apartment house, or the like, or wastewater from an office.

Most of the water treatment equipment is produced in factories, and in particular, water treatment equipment for domestic wastewater with 50 or less tanks accounts for 98% of the total production. The outer shell of this water treatment device is mainly composed of a molded product that is divided into upper and lower parts, and is called a so-called capsule type in which the upper and lower parts are flange-joined.
Various molding methods have heretofore been proposed for the molding method of this molded product. One of them is reaction injection molding.
As disclosed in Patent Document 1, there has been proposed a method in which an opening for mounting a manhole frame and a manhole cover is provided at the same time as the upper outer shell tank body is formed by reaction injection molding.

On the other hand, depending on the installation conditions, for example, when the water treatment device is installed away from the wastewater discharge point, the slope of the wastewater pipe causes a deep pipe to flow into the water treatment device (the bottom of the inflow pipe is It may be buried deeper than normal because it is buried (deep) and the inflow pipe joint of the water treatment device must be connected accordingly.
In this case, since the water treatment device manhole becomes deeper than the ground surface, it is necessary to prepare a member called a manhole bulking frame as shown in Patent Document 2 and connect it to the manhole frame.

JP-A-8-300390 JP, 10-258895, A

However, most of the manhole bulkheads currently on the market have a height of 30 cm. For example, even if a person with a height of 5 cm or less is required, a manhole bulkhead with a height of 30 cm is purchased and cut into 5 cm or less before use. There is a need. For this reason, there is a problem that the amount of waste material increases and the environmental load is high.

The present invention has been made in view of the above-mentioned problems, and when deeply burying about a few cm, a manhole bulking frame is not used, and a water treatment device that corresponds to the bottom of the inflow pipe in advance at the stage of production is provided. The purpose of the present invention is to provide an environment-friendly, inexpensive, and easy-to-install water treatment device that does not produce waste materials.

The present invention has the following configurations as means for solving the above problems.
(1) The water treatment device of the present invention is a water treatment device comprising an outer shell and a partition plate for partitioning the inside, wherein the outer shell is divided into at least two parts, an upper outer shell and a lower outer shell, and the upper shell The outer shell and the lower shell each have a flange portion for joining, and the height of the upper shell is 1/3 or less and 1/5 or more of the total height of the water treatment device, and the upper shell is at least the first. There are two types of upper outer shell and second upper outer shell, the lower outer shell is common, and a first water treatment device combining the lower outer shell and the first upper outer shell, and the lower outer shell. At least two types of water treatment devices of the second water treatment device in combination with the second upper shell can be produced.

(2) In the present invention, the upper shell has a protrusion in a vertical direction, and the protrusion of the first upper shell projects more upward than the projection of the second upper shell. It is preferable that the first upper shell and the second upper shell have the same shape below the protrusion.
(3) In the present invention, it is preferable that the upper shell is formed by using the same mold, and the protrusion has a protrusion height adjusted by using a nest.

(4) The water treatment device of the present invention is a water treatment device including an outer shell and a partition plate for partitioning the inside, wherein the outer shell is divided into at least two parts, an upper outer shell and a lower outer shell. The outer shell and the lower shell each have a flange portion for joining, the lower shell is common, the upper shell has a protrusion in the vertical direction, and the first outer shell has a protrusion. The first upper outer shell and the second upper outer shell have the same shape as the lower outer shell and project from the projecting portion of the second upper outer shell in an upward direction. At least two types of water treatment devices can be produced: a first water treatment device that combines the first upper shell and a second water treatment device that combines the lower shell and the second upper shell. Is characterized in that
(5) In the present invention, it is preferable that the upper shell is formed by using the same mold, and the protrusion has a protrusion height adjusted by using a nest.

According to the present invention, it is possible to prepare a water treatment device having different inflow pipe bottoms in advance in the same person tank and the same treatment system, so that the manhole raising frame is not required at the construction site, and the waste material It is possible to provide a water treatment device that is excellent in workability and is environment-friendly and inexpensive.
If the water treatment device of the present invention cannot adjust the bottom of the inflow pipe in a hurry at the site, it can be adjusted in combination with the raising frame as in the conventional case, and the present invention does not limit the use of the raising frame. It is possible to provide a water treatment device having excellent workability.

Further, the present invention is also superior when a different human tank is used as an advanced treatment tank. For example, there is a case where a normal water treatment device 7 person tank with a discharged water quality of 20 mg/L is used as an advanced treated water treatment device 5 person tank with a discharged water quality of 10 mg/L, while leaving the outer shell as it is.
Since the advanced treatment water treatment device is often installed in a relatively large area such as a tap water source, the distance from the house to the water treatment device becomes long and the bottom of the inflow pipe tends to be low.
On the other hand, the water treatment device is usually installed in an urban area and the land is relatively small. Therefore, the house and the water treatment device are close to each other and the bottom of the inflow pipe tends to be shallow.
According to the present invention, both water treatment devices have the same outer shell, but the requirements for the bottom of the inflow pipe are different. Therefore, if the water treatment device according to the present invention is adopted, the cost of the molding die can be reduced and the productivity is also improved. Can be improved.

FIG. 1(a) is a side view showing an assembly process of a water treatment device using a first upper shell based on the first embodiment of the present invention, and FIG. 1(b) shows a first embodiment of the present invention. It is a side view which shows the assembly process of the water treatment apparatus which uses the 2nd upper outline based on it. FIG. 2A is a side view showing the water treatment device produced in the process shown in FIG. 1A, and FIG. 2B is a side view showing the water treatment device produced in the process shown in FIG. 1B. It is a figure. FIG. 3(a) is a phantom diagram showing a state in which the load applied to the top surface is received by the arch when the height of the upper shell is 780 mm, and FIG. 3(b) is applied to the top surface when the height of the upper shell is 520 mm. An imaginary diagram showing a state in which the load is received by the arch, FIG. 3(c) is a phantom diagram showing a state in which the load applied to the top surface is received by the arch when the height of the upper shell is 390 mm, and FIG. It is an imaginary diagram which shows the state which receives the load applied to a top surface, when the height of an outer shell is 312 mm. FIG. 4(a) is a side view showing an assembling process of the water treatment device using the third upper shell according to the second embodiment of the present invention, and FIG. 4(b) shows the second embodiment of the present invention. It is a side view which shows the assembly process of the water treatment apparatus which uses the 4th upper outer shell based. FIG. 5A is a side view showing the water treatment device produced in the process shown in FIG. 4A, and FIG. 5B is a side view showing the water treatment device produced in the process shown in FIG. 4B. It is a figure. FIG. 6A is a partial cross-sectional view and FIG. 6B is a bird's-eye view with a partial cross-section, showing the vicinity of the projecting portion of the upper shell shown in FIG. 3 or 4. Fig. 7(a) is a cross-sectional view showing a state immediately before mounting the first insert on the lower mold, and Fig. 7(b) shows a lower mold, showing an example of a third method of forming the upper shell. Sectional view showing a state in which the first insert is attached, FIG. 7(c) is a sectional view showing a state in which the upper die is installed on the lower die, and FIG. 7(d) shows a part of the obtained upper shell. It is sectional drawing shown. FIG. 8(a) is a cross-sectional view showing a state immediately before the second insert is attached to the upper die, and FIG. 8(b) is an upper die showing an example of a fourth upper shell forming method. FIG. 8C is a sectional view showing a state in which the second insert is attached, FIG. 8C is a sectional view showing a state in which the upper die is installed on the lower die, and FIG. 8D is a partial view of the obtained upper shell. It is sectional drawing shown. FIG. 9(a) is a cross-sectional view showing a state immediately before mounting the third insert on the upper die and the fourth insert on the lower die, showing an example of a fifth upper shell forming method; 9(b) is a cross-sectional view showing a state in which the third die is attached to the upper die and the fourth die is attached to the lower die, and FIG. 9(c) is a state in which the upper die is installed on the lower die. The sectional view shown in FIG. 9D is a sectional view showing a part of the obtained upper shell. Fig. 10(a) is a partial cross-sectional view of the lower mold, and Fig. 10(b) is a cross-sectional view showing a state in which a material is placed on the lower mold and cured, showing an example of a molding method using only the lower mold. 10(c) is a cross-sectional view showing a part of the obtained upper shell. Fig. 11(a) is a partial cross-sectional view showing a state immediately before mounting the fifth insert on the lower mold, and Fig. 11(b) shows the molding method using only the lower mold. 5 is a partial sectional view showing a state in which the insert of No. 5 is attached, FIG. 11(c) is a sectional view showing a state in which the material is placed on the lower mold and cured, and FIG. 11(d) is one of the obtained upper shells. It is sectional drawing which shows a part. Explanatory drawing which shows an example of the state which connected the outflow pipe of the water treatment apparatus shown in FIG.5(b), when the bottom depth of the gutter of a discharge destination is 300 mm. Explanatory drawing which shows an example of the state which installed the water treatment apparatus using the inflow pipe bottom of the water treatment apparatus shown to Fig.5 (a), considering freezing depth 600mm. Explanatory drawing which shows an example of the state which installed the water treatment apparatus using the inflow pipe bottom of the water treatment apparatus shown in FIG.5(b), considering freezing depth 600mm.

"First embodiment"
Hereinafter, a water treatment device based on the first embodiment of the present invention will be described with reference to FIGS. 1, 2, and 3.
As shown in FIGS. 1(a) and 2(a), the water treatment device 1a described in the first embodiment includes a lower outer shell 2, a partition plate 3, an inner member, an outer member, and an upper outer shell 4a. It is configured.
The water treatment device 1a is a generally horizontally long rectangular box type, and the lower shell 2 is a top opening type tank having a bottom wall and four side walls. The upper outer shell 4a is formed in a lid shape that can close the opening of the lower outer shell 2, and includes a ceiling wall and four side walls.
Here, the assembly process of the water treatment device 1a will be described.
First, two partition plates 3 are joined to the lower outer shell 2 with an adhesive or the like, and an internal member (not shown) is assembled. Both the lower outer shell 2 and the upper outer shell 4a are manufactured by integral molding with a resin material.
The lower shell 2 has a slightly narrowed shape, and the two partition plates 3 are arranged so as to be orthogonal to the long side wall of the lower shell 2. An outward flange portion 10 is formed on the periphery of the upper surface opening of the lower shell 2. Further, a plurality of vertical ribs 2a for reinforcement are formed on the side surface of the lower outer shell 2.

Next, the inflow joint 5 and the outflow joint 6 are attached to the upper outer shell 4a, and the manhole frame 7 is attached to the protruding portion 40 of the upper outer shell 4a.
The upper outer shell 4a has holes (for inflow joint, outflow joint, and manhole frame) preliminarily formed therein, and it is not necessary to drill holes when attaching the above-mentioned components. Since the upper shell 4 is formed in a lid shape that closes the upper opening of the lower shell 2, a vertical rib 4h having a shape matching the vertical rib 2a of the lower shell 2 is formed on the long side wall. A flange portion 9 having a shape matching the flange portion 10 of the lower shell 2 is formed on the peripheral edge of the lower surface opening. An inlet pipe 5 is attached to one side wall (left side wall in FIG. 1A) 4i of the upper outer shell 3a so as to penetrate the side wall 4i, and the other side of the shorter side of the upper outer shell 3a is attached. The outflow pipe 6 is attached to the side wall (the right side wall in FIG. 1A) 4j so as to penetrate the side wall 4j.
The bottom of the inflow pipe in this case is L1. The inflow pipe bottom L1 means the difference in height between the upper surface of the manhole frame 7 and the bottom of the inflow pipe 5.

Then, an adhesive or the like is applied to the flange portion 10 of the lower outer shell 2 and the flange portion 9 of the upper outer shell 4a to join them together. If necessary, it is preferable to use a metal fastening member such as a rivet at the joining portion to assist the joining as a temporary fixing member until the required strength of the adhesive is developed.
After that, after the water filling inspection and the operation confirmation, the manhole cover 8 is attached on the manhole frame 7, and the water treatment device 1a is completed as shown in FIG. 2(a).

On the other hand, the process of assembling the water treatment device 1b will also be described. The water treatment apparatus 1b has a lower outer shell 2 equivalent to the lower outer shell 2 of the water treatment apparatus 1a, and the upper outer shell 4b is different from the upper outer shell 4a only in the bottom of the inflow pipe. The inflow pipe bottom L2 of the upper outer shell 4b is, for example, larger than the inflow pipe bottom L1 of the upper outer shell 4a.
The partition plate 3 is joined to the lower outer shell 2 with an adhesive or the like, and an internal member (not shown) is assembled.
Next, the inflow joint 5, the outflow joint 6, and the manhole frame 7 are attached to the upper outer shell 4b.
The bottom of the inflow pipe in this case is L2.

Then, an adhesive or the like is applied to the flange portion 10 of the lower outer shell 2 and the flange portion 9 of the upper outer shell 4b to join them. If necessary, a metal fastening member such as a rivet may be used to assist the joining at the joining portion.
After that, after the water filling inspection and the operation confirmation, the manhole cover 8 is attached, and the water treatment device 1b is completed. The bottom of the inflow pipe in this case is L2.
The assembly process itself of the water treatment device 1a and the water treatment device 1b is the same.

Since the components are the same except for the upper shell, the process can be standardized and most of the members can be standardized, so that it is possible to provide the water treatment apparatuses 1a and 1b that are inexpensive and have stable quality.
Here, two water treatment devices having different upper shells have been described, but the same applies to the case of two or more water treatment devices. By replacing the upper shell, it is possible to produce any number of water treatment devices with different inflow pipe bottoms.

If several types of upper molds are prepared, it is possible to produce a plurality of water treatment devices with different inflow pipe bottoms. However, in that case, the cost of the mold becomes high.
Therefore, in order to minimize the cost of the upper mold, the ratio of the upper shell to the water treatment device is reduced.
When viewed in the height direction, the height of the upper shell occupying the entire height of the water treatment device should be one third or less.

The cost of the mold is assumed to be 100 including the upper mold and the lower mold. Usually, the upper mold 50 and the lower mold 50. If another upper mold is made as it is, the cost will be 50×2 upper molds+50 lower molds=150. Therefore, if the height of the upper shell is set to one-third of the total height (the total height of the water treatment device), the cost can be reduced by the upper mold 33×2+the lower mold 67=133.
If the height of the upper shell is between ½ and ⅓ of the total height, the cost reduction effect is small.
For example, if the height of the upper shell is made a quarter of the total height, the upper mold is 25×2 pieces+the lower mold 75=125, and the cost can be further reduced.
Further cost reduction can be expected by further reducing the height of the upper shell.

On the other hand, consider the strength of the water treatment device. Water treatment equipment is buried underground. Although a slab is placed on the upper part, it may become a parking lot, so the shape must withstand the load from the upper part.
In order to withstand this load, the top surface of the upper shell should be a curved arch. However, if the height of the upper shell is not sufficient, the radius of curvature of the arch becomes large and the strength decreases.
If the height of the upper shell is less than one-fifth of the total height, the top surface will be close to a flat surface, so strength cannot be expected and the wall thickness of the top surface must be increased accordingly. The cost will be high.

Take, for example, a 5-person tank. The total height of a currently common water treatment device is about 1560 mm. Similarly, the width is generally about 800 mm (excluding the flange portion). Usually, the height of the upper shell is set to 1560 mm×1/2=780 mm.
The withstand pressure load of the upper shell will be described with reference to FIG.
FIG. 3 is an imaginary diagram of a cross section of the upper shell as viewed from the lateral direction (inflow side, outflow side). The height of the upper shell is 780 mm (including the protrusion of 70 mm of the upper shell), the width of the lower bottom is 800 mm, and the side wall surface is designed to have a typical draft of 3°. Since the load applied to the top surface is received by the arch, the circle drawn by the arch and the top surface and the side wall surface are tangent to each other so that there is no concern about buckling.
The radius of the circle drawn in this way, that is, the radius of curvature of the arch is about 382 mm, and the distance between the contact point with the side wall surface and the lower bottom is about 347 mm, which is a shape capable of sufficiently receiving a load.

FIG. 3B is an imaginary diagram in the case where the height of the upper shell is 1560 mm×1/3=520 mm. Similarly, when the radius of curvature is obtained, the radius of curvature is about 397 mm, and the distance between the contact point with the side wall surface and the lower bottom is about 74 mm, which is also a shape capable of sufficiently receiving a load.

FIG. 3C is an imaginary diagram when the height of the upper shell is 1560 mm×1/4=390 mm. Similarly, when the radius of curvature is obtained, the contact point with the side wall surface goes below the lower base and a circle cannot be drawn. Therefore, in this imaginary diagram, a circle that passes through both end points of the lower bottom and is in contact with the top surface is drawn as an arch. The radius of curvature is about 410 mm. At this time, the angle of entry of the circle into the side wall surface is about 10° (when the tangent is tangent, the angle of entry is 0°), and the load can be almost received.

FIG. 3D is a diagram when the height of the upper shell is 1560 mm×1/5=312 mm. Similarly, when the radius of curvature is obtained, the radius of curvature is about 451 mm. The angle of entry of the circle into the side wall surface is about 25°, leaving some concerns about the strength against the load from above. Therefore, in order to reduce the entering angle, it is necessary to change the curvature from the middle or to provide the contact portion with R, which results in cost increase. If the entry angle exceeds 45°, it becomes difficult to take measures.
As in the example of Fig. 3(d), at 1/5 of the height of the upper shell, there was some concern about the strength against the load from the upper part, but the total height and width differ depending on the water treatment equipment human tank, etc. Therefore, the upper limit of the upper shell is practically one fifth.

In addition, it is necessary to consider the lateral pressure due to soil when burying underground water treatment equipment. The joint surface (flange portion) of the upper shell and the lower shell plays the role of a beam on the structure and is strong in strength. Therefore, when it is arranged at the center of the height of the water treatment device, it becomes advantageous in strength. In other words, if the height of the upper shell is too low, the strength will be disadvantageous.
From the above, the height of the upper shell is preferably in the range of 1/3 to 1/5 of the total height of the water treatment device.

Now, according to this embodiment, a plurality of types of upper shells are produced for producing the water treatment device. In order to efficiently produce the upper shell, a certain number of upper shells must be grouped together and molded in advance. What is needed at this time is a storage space (flat) for the upper shell.
When storing, store the upper shells in stacks. The larger the number of stacks, the smaller the required space. In order to increase the number of stacking steps, the height of the upper shell may be reduced, but if it is made too small, the radius of curvature of the arch of the top surface of the upper shell increases and the strength decreases. As a result, the lower-stage molded product may lose the weight of the upper-stage molded product and may be crushed.
Therefore, the height of the upper shell is preferably within the range of 1/3 to 1/5 of the total height.

"Second embodiment"
Hereinafter, a water treatment device based on the second embodiment of the present invention will be described with reference to FIGS. 4(a) and 5(b) and FIGS. 5(a) and 5(b).
The water treatment apparatus of the second embodiment is also a water treatment apparatus that can be produced by replacing the upper shell, like the water treatment apparatus of the first embodiment.
The difference between the water treatment device of the first embodiment and the water treatment device of the second embodiment is the difference in the protrusion of the upper shell.

The water treatment device 1c described in the second embodiment is composed of a lower outer shell 2, a partition plate 3, an inner member, an outer member, an upper outer shell 4c and the like as in the first embodiment.
The assembly process of the water treatment device 1c is similar to that of the first embodiment.
First, the partition plate 3 is joined to the lower outer shell 2 with an adhesive or the like, and an internal member (not shown) is assembled.
Next, the inflow joint 5 and the outflow joint 6 are attached to the upper outer shell 4c, and the manhole frame 7 is attached to the protruding portion 40 of the upper outer shell 4c.
The projecting portion 40 of the upper outer shell 4c projects above the projecting portion 40 of the upper outer shell 4d described later. The bottom of the inflow pipe in this case is L3. The inflow pipe bottom L3 means a height difference between the upper surface of the manhole frame 7 and the bottom of the inflow pipe 5.

Then, an adhesive or the like is applied to the flange portion 10 of the lower outer shell 2 and the flange portion 9 of the upper outer shell 4c to join them. If necessary, a metal fastening member such as a rivet is used as a temporary fixing member until the required strength of the adhesive is developed at the joining position, to assist the joining.
After that, after the water filling inspection and the operation confirmation, the manhole cover 8 is attached, and the water treatment device 1c shown in FIG. 5A is completed.

By replacing the upper shell 4c of the water treatment device 1c with the upper shell 4d, the water treatment device 1d shown in FIG. 5B can be obtained.
The difference between the upper outer shell 4c and the upper outer shell 4d is the difference in the projecting height of the projecting portion 40.
In this embodiment, there are two protrusions 40 on the upper shell 4c. The number of the protruding portions 40 is not limited, and a necessary number is installed in consideration of maintainability.
The protrusion 40 of the upper outer shell 4d is lower than the protrusion 40 of the upper outer shell 4c. Therefore, at the mounting position of the inflow joint 5, the upper outer shell 4c and the upper outer shell 4d have the same vertical distance from the flange portion 9, but the distance from the upper end of the protruding portion 40 is different, and therefore the inlet pipe bottom is L3. And L4 (L3>L4).

The protrusion 40 preferably has a horizontal surface 41 as a guide for mounting the manhole frame 7 (see FIGS. 6A and 6B). Holes for maintaining and managing the inside of the water treatment device are formed on the horizontal surface 41, and most of the holes have a diameter of 450 mm or 600 mm.

By the way, even with the same water treatment device, construction conditions vary depending on the region.
In dense residential areas, the water treatment equipment must be installed near the building. In this case, since the distance between the discharge point of the building and the water treatment device is short, the bottom of the inflow pipe is shallow. At the same time, since the bottom of the outflow pipe becomes shallow, the outflow pipe can be laid down to the gutter with a normal gradient (for example, a gradient of about 1/100), and the chance of relying on the discharge pump tank is reduced. It is possible to improve workability and reduce costs.
Consider an example of this case.
At present, a common water treatment device for a 5-person tank has an inflow pipe bottom of 290 to 300 mm and an outflow pipe bottom of 320 to 330 mm.
For example, the inflow pipe bottom L4 of the water treatment device shown in FIG. 5B is set to 290 mm and the outflow pipe bottom is set to 330 mm. 2m to the gutter of the discharge destination, the pipe gradient is 1/100, and the water gradient of the ceiling slab of the water treatment device is 3/100, as shown in FIG. 12, even if the bottom of the gutter of the discharge destination is 300mm. Since an outlet pipe can be connected, a discharge pump tank is not required.
On the other hand, in cold regions, in principle, sewage pipes are set to be buried below the freezing depth.
Although the setting value for the freezing depth varies depending on the region, many municipalities are instructing to bury it at least 600 mm deep.
Similarly, in the water treatment device shown in FIG. 5B, considering the freezing depth of 600 mm, the inflow pipe bottom L4 is 290 mm and the deep padding frame 50 shown in FIG. 14 is 300 mm, which is 590 mm in total. The freezing depth refers to the distance from the ground surface to the top of the pipe, and is 490 mm after subtracting the pipe diameter of 100 mm from 590 mm. The difference 110 mm between 600 mm and 490 mm is dealt with by the pit construction in which the raising frame 50 is provided and the pit P surrounding the upper portion of the raising frame 50 is provided thereon as shown in FIG.
Here, if the inflow pipe bottom L3 of the water treatment device shown in FIG. 5(a) is produced at 340 mm which is 50 mm deeper than L4, the difference 110 mm is reduced by 50 mm to 60 mm as shown in FIG. The workability of is also reduced.
By adopting the configuration of the present embodiment as described above, depending on the region, it is possible to selectively use the case where the water treatment device of L4 having a shallow inlet pipe bottom is advantageous and the case where the water treatment device of deep L3 is advantageous. ..

"Production (molding) method"
Differences in the method of producing (molding) the upper shell 4c and the upper shell 4d will be described below with reference to FIGS. 7 and 8. In particular, focusing on the projecting portion 40 of the portion indicated by the one-dot chain line in FIGS. 6A and 6B, the description will be made with reference to FIGS. 7 and 8.
FIG. 7 shows a method of forming the upper outer shell 4c. This molding method is a molding method in which an upper mold and a lower mold are used, and a space formed when the upper mold and the lower mold are engaged with each other is filled with a material to form a shape.

In addition to the upper mold 100 and the lower mold 101, a nest (first nest) 102 is prepared (FIG. 7A). The insert 102 having a thickness that fills the depth direction of the step 101A formed on the upper peripheral edge of the lower mold with the depth of the insert 102 is used. The height of the insert 102 is formed slightly lower than the height of the step portion 101A.
First, the insert 102 is attached to the lower mold 101 (FIG. 7B). In this state, most of the stepped portion 101A is buried, but a thin stepped portion 101B is formed on the uppermost part of the stepped portion 101A.
Next, the upper mold 100 is engaged with the lower mold 101 (FIG. 7C). When the space formed at this time is filled with the material and the upper mold 100 is removed from the lower mold 101 after the material is hardened, the upper outer shell 4c which is a molded product is completed (FIG. 7(d)).
The timing of filling the material may be the stage of FIG. 7B or the stage of FIG. 7C and is not limited. Further, there are various molding conditions depending on the filling material, such as applying pressure or heat, cooling, taking a long meshing time, etc. at the time of meshing shown in FIG. is not.

FIG. 8 shows a method of forming the upper outer shell 4d.
In addition to the upper mold 100 and the lower mold 101, a nest (second nest) 103 is prepared (FIG. 8A). The nest 103 can close the upper portion of the step portion 101A, but has a thickness and a height that causes a slight gap at the bottom portion of the step portion 101A when the upper portion of the step portion 101A is closed.
The upper mold 100 and the lower mold 101 are the same as those in FIG. In other words, it is a shared type.
Here, the insert 103 is attached to the upper mold 100 (FIG. 8B).
Next, the upper mold 100 is engaged with the lower mold 101 (FIG. 8C). The nest 103 occupies the upper portion of the step portion 101A in the state of FIG. 8C, and creates a slight gap at the bottom portion of the step portion 101A.
At this time, a material is filled in a space formed between the upper mold 100 and the lower mold 101 and a space formed at the bottom of the stepped portion 101A, and the upper mold 100 is removed from the lower mold 101 after the material is cured. The outer shell 4d is completed (FIG. 8(d)).

The protrusion 40 shown in FIG. 7(d) and the protrusion 40 shown in FIG. 8(d) have different protrusion heights, and the protrusion 40 shown in FIG. 7(d) has a higher protrusion height. .. This depends on whether a space for filling the material is provided on the upper side of the stepped portion 101A or a space for the material filling is provided on the bottom side of the stepped portion 101A.
Therefore, the water treatment device 1c for the inflow pipe bottom L3 shown in FIG. 5A and the water treatment device 1d for the inflow pipe bottom L4 shown in FIG. 5B can be obtained.
Since the inflow pipe bottom L3 is larger than the inflow pipe bottom L4, the water treatment device 1c shown in FIG. 5(a) is suitable when the gradient of the inflow pipe connected to the inflow joint 5 is large, and is shown in FIG. 5(b). The water treatment device 1d is suitable when the gradient of the inflow pipe connected to the inflow joint 5 is small. Even when the upper mold 100 and the lower mold 101 are shared, when the gradient of the inflow pipes is different, the water treatment device 1c and the water treatment device 1d that can cope with the inflow pipes having different slopes are used properly by properly using the inserts. Thus, it is possible to manufacture a water treatment device that is compatible with both.

FIG. 9 shows a case where the protrusion has a height about the middle of the heights of the protrusions of the upper outer shell 4c and the upper outer shell 4d.
In addition to the upper mold 100 and the lower mold 101, a third insert 104a and a fourth insert 104b are prepared (FIG. 9A).
The upper mold 100 and the lower mold 101 are the same as the upper mold and the lower mold shown in FIGS. 7 and 8. In other words, it is a shared type.
Here, the insert (third insert) 104a is attached to the upper mold 100, and the insert (fourth insert) 104b is attached to the lower mold 101 (FIG. 9B). The nest 104a has a size that can occupy the upper portion of the step portion 101A, and the nest 104b has a size that can occupy the lower portion of the step portion 101A. However, the total value of the height of the nest 104a and the height of the nest 104b is set to be slightly lower than the height of the step portion 101A.

Next, the upper mold 100 is engaged with the lower mold 101 (FIG. 9C). At this time, a material is filled in a space formed between the upper mold 100 and the lower mold 101 and a space formed between the inserts 104a and 104b, and the upper mold 100 is removed from the lower mold 101 after the material is hardened. The upper shell 4e, which is a product, is completed (FIG. 9(d)).
By making the upper mold 100 and the lower mold 101 common and preparing various kinds of inserts, the height of the protruding portion can be freely changed between the upper outer shell 4c as the upper limit and the upper outer shell 4d as the lower limit. ..
In the embodiment described above, an embodiment using the upper mold 100 and the lower mold 101 has been described, but the upper shell may be manufactured using only the lower mold.

"Third embodiment"
An embodiment in which the upper shell is molded using only the lower mold will be described below with reference to FIGS. 10 and 11.
First, the lower mold 201 having the stepped portion 201A is prepared (FIG. 10A). In this state, the material is fitted to the shape of the placing lower mold 201 (FIG. 10(b)). After the material is hardened, the lower mold 201 is removed, and the upper outer shell 4f, which is a molded product, is completed (FIG. 10(c)). At this time, the protruding material is cut along the dotted line in FIG.

Next, the lower mold 201 is prepared (FIG. 11A). The lower mold 201 is the same common type as the above.
The insert (fifth insert) 202 is attached to the lower mold 201 (FIG. 11B). The insert 202 has a thickness capable of occupying the step portion 201A in the thickness direction, but the height is formed slightly lower than that of the step portion 201A.
In this state, the material is fitted to the shapes of the placing lower mold 201 and the nest 202 (FIG. 11(c)). Since the top of the insert 202 is slightly lower than the top of the lower mold 201, a small step 201B is formed on the top of the insert 202. The material is placed so as to fill the small step portion 201B, and the material is placed so as to reach the upper surface of the lower mold 201 over the step portion 201B.
After the material is hardened, the lower mold 201 and the insert 202 are removed, and the upper outer shell 4g, which is a molded product, is completed (FIG. 11(d)). At this time, the protruding material is cut along the dotted line in FIG.

As shown in FIGS. 10 and 11, two types of molded products having different bottoms of the inflow pipe can be produced by using the lower mold 201 as a common mold and using the insert 202 or not using the insert. ..
Also in this case, by preparing a plurality of inserts, it is possible to produce a plurality of molded products having different inflow pipe bottoms.
In the case of forming a protrusion having an intermediate height between the upper shell 4f and the upper shell 4g, it can be realized by attaching a nest shorter than the nest 202 to the step 201A and placing the material thereon.
In addition, in this embodiment, the lower mold has been described as a convex (male) embodiment, but the lower mold may be a concave (female).

According to the Building Standard Act Enforcement Ordinance, it is necessary to confirm that the septic tank, which is a water treatment device, should be filled with water and not leak for 24 hours or more before being buried, and the structure must withstand the internal water pressure at this time. It is specified that
In the water treatment equipment, the joint surface (flange) of the upper and lower shells plays the role of a beam on the structure, so it is below the center of the total height where the amount of deformation is greatest due to internal water pressure. It is preferable to arrange in. However, if the flange exceeds a certain amount of deformation, the adhesive on the joint surface peels off and the water content leaks from the flange, so it is possible to place the flange near the water surface with low internal water pressure. preferable.

Below, an example in which the water treatment device is a 5-person tank and the total height is 1560 mm will be considered.
According to the National Treasury Supplementary Guideline, the distance from the top of the manhole to the surface of the water is set to 350 mm.
When the joint surface of the upper shell and the lower shell is arranged in the center of the total height of the water treatment device, it is 1560 x 1/2 = 780 mm, so the distance between the joint surface and the water surface is 780-350 = 430 mm. is there.
On the other hand, in the water treatment device of the present invention, the height of the upper outer shell is ⅓ to ⅕ of the total height, and therefore is 520 to 312 mm. Therefore, the distance between the joint surface and the water surface is 170 to minus 38 mm (minus indicates above the water surface).
The present inventor incorporated two partition plates into the upper shell and the lower shell having a total length of 3115 mm, and the joining surface (flange portion) was joined with metal bolts and nuts to assist joining, and a water leakage test was conducted for 24 hours.

When the distance between the joint surface and the water surface was 170 mm, water leakage did not occur under the conditions of the bolt pitch (bolt-to-bolt interval) of 215 mm, 240 mm, and 330 mm.
When the distance between the joint surface and the water surface was 430 mm, there was no water leakage under the conditions of a bolt pitch of 215 mm and 240 mm, but there was water leakage when the bolt pitch was 330 mm.
From the above test results, it can be seen that the bolt pitch can be set to 330 mm when the height of the upper outer shell is 1/3 to 1/5 of the total height. In other words, the number of bolts can be reduced within a range where water leakage does not occur, which is advantageous in productivity and resource saving.

1a, 1b, 1c, 1d... Wastewater treatment device, 2... Lower shell, 3... Partition plate,
4a, 4b, 4c, 4d, 4e, 4f, 4g... Upper shell, 4i, 4j... Side wall, 40... Projection part,
41... Horizontal surface, 5... Inflow joint, 6... Outflow joint, 7... Manhole frame, 8... Manhole lid,
9... Flange of upper shell, 10... Flange of lower shell,
100... Upper mold, 101... Lower mold, 101A, 101B... Step section,
102, 103, 104a, 104b... Nesting,
201... Lower mold, 201A, 201B... Step, 202... Nest,
L1, L2, L3, L4... Inflow pipe bottom.

Claims (5)

A water treatment device comprising an outer shell and a partition plate for partitioning the inside, wherein the outer shell is divided into at least two parts, an upper outer shell and a lower outer shell, and the upper outer shell and the lower outer shell are respectively for joining. A flange portion is provided, and the height of the upper outer shell is 1/3 or less and 1/5 or more of the total height of the water treatment device, and the upper outer shell is at least the first upper outer shell and the second upper outer shell. There is a type, the lower outer shell is common, and a first water treatment device that combines the lower outer shell and the first upper outer shell, and a second water processor that combines the lower outer shell and the second upper outer shell. 2. At least two types of water treatment devices of the above water treatment device can be produced. The upper shell has a protrusion in the vertical direction, and the protrusion of the first upper shell projects more upward than the projection of the second upper shell, and the first upper shell and the first outer shell. The water treatment device according to claim 1, wherein the second upper shell has the same shape below the protruding portion. The water treatment apparatus according to claim 1 or 2, wherein the upper shell is formed by using the same mold, and the protrusion has a protrusion height adjusted by using a nest. .. A water treatment device comprising an outer shell and a partition plate for partitioning the inside, wherein the outer shell is divided into at least two parts, an upper outer shell and a lower outer shell, and the upper outer shell and the lower outer shell are respectively for joining. A flange portion, the lower outer shell is common,
The upper shell has a protrusion in the vertical direction, and the protrusion of the first upper shell projects more upward than the projection of the second upper shell, and the first upper shell and the first outer shell. The second upper outer shell has the same shape below the protrusion,
At least two types of water treatments, a first water treatment device that combines the lower outer shell and the first upper outer shell, and a second water treatment device that combines the lower outer shell and the second upper outer shell. A water treatment device characterized in that the device can be produced. The water treatment apparatus according to claim 4, wherein the upper shell is formed by using the same mold, and the protrusion has a protrusion height adjusted by using a nest.

Images