JPH0126758B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a septic tank with a built-in sedimentation tank, the gist of which is that the upper half 1 has the same diameter over the entire length in the vertical direction, and the lower half 2 has a diameter that decreases as it goes downward. A sedimentation tank 3 having an inverted conical shape is built into a horizontal cylindrical housing 4, and the upper portion of the housing 4 is
This relates to a septic tank with a built-in sedimentation tank characterized in that shoulders 5 on both sides of the upper half 1 of the sedimentation tank 3 protrude from portions located on both sides with respect to the axial direction.

In general, in cylindrical combined treatment septic tanks made of FRP, there are no examples of a built-in sedimentation tank built into the tank, except for small tanks (with a treatment capacity of about 15 m ³ /day).
Almost all conventional septic tanks A' have a separate sedimentation tank 3' as shown in FIG.
The disadvantage of this type is that construction is troublesome.

1. Since it is a separate tank, a pipe connection is required.

2 In most cases, the height is not aligned with the main body,
It is necessary to add a step to the foundation slab.

3 The bottom is hopper-shaped, making it difficult to hold it upright.

The quality of construction affects performance.

If the construction is sloppy, the pipes may have a reverse slope or may not be properly leveled, which will affect performance.

A stand is required at the bottom, which is expensive.

The sedimentation tank itself is so narrow at the bottom that it cannot stand on its own without a stand.

However, I dared to choose this type and use the second
This is because if the settling tank 3' is built into the housing 4' as shown in the figure, there will be dimensional limitations and a specified capacity cannot be secured. Specifically, as shown in Figure 2, the hopper angle θ is 60°, and the bottom is 0.2L for one side L of the sedimentation tank 3' where the water surface is located. Approximately 3.8
Only a capacity of m ³ can be secured.

The present invention has been made in view of the above points, and its object is to provide a septic tank with a built-in sedimentation tank that can secure a specified capacity even if the sedimentation tank is built-in.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

The septic tank A has a horizontal cylindrical housing 4 that is closed at both ends, and includes a plow tank (not shown), a sedimentation tank 3, and the like built therein. The housing 4 and the settling tank 3 are made of FRP or the like. The sedimentation tank 3 is composed of a lower half 2 and an upper half 1.
has the same diameter over the entire length in the vertical direction, and the lower half 2 is formed in an inverted conical shape (hopper shape) with the diameter decreasing toward the bottom. Portions of the upper portion of the housing 4 located on both sides of the housing 4 in the lateral direction are bent upward to form protrusions 6, respectively. The shoulders 5 on both sides of the upper half 1 of the settling tank 3 are housed in the protruding parts 6 of the housing 4, and the bottom of the lower half 2 of the settling tank 3 is placed on the bottom surface of the housing 4. be. An opening 7 for drawing sludge is provided in the upper wall of the housing 4 facing the upper surface of the settling tank 3, and a rectangular frame 8 for supporting a manhole is formed from the periphery of the opening 7.

Now, the specified capacity V of the settling tank 3 that satisfies the structural standard conditions as shown in FIG. 5 is expressed by the following equation.

V = L ² × (H - 0.7L) + 1/3 (L ² + (0.6L) ²
+√ ² × (0.6) ² ) × 0.35L = L ² (H - 0.7L) + 0.2287L ^3Here , L is the length of one side of the sedimentation tank where the water surface is located, and H is the height of the sedimentation tank. The shaded area is not included in the effective capacity according to the structural standards. In order to secure the capacity, L can be increased, but there is a limit under the condition that it is inside the housing 4 of the commonly used septic tank A with a diameter of about 2500 mm. Therefore, by protruding the shoulder portion 5 of the sedimentation tank 3 as in the present invention, the dimensional limitations of the housing 4 can be relaxed and the sedimentation tank 3
It becomes possible to increase L.

FIG. 6 shows how to fit the settling tank 3 into the housing 4. First, a part of the upper wall of the housing 4 is cut out to form a cut-out opening 9 for inserting the settling tank 3, and then Uprights 10 are formed on both sides of the cutout opening 9 by hand-lay molding, and the settling tank 3 is inserted into the housing 4 through the cutout opening 9 and the shoulder 5 of the settling tank 3 is positioned within the uprights 10. The cutout opening 9 is covered with a lid (not shown) having an opening 7 . FIG. 7 shows the rise 1 of the machine-formed cutout opening 9.
A method of filling the settling tank 3 without forming a zero is shown.

As described above, the present invention has a sedimentation tank built into a horizontal cylindrical housing, which has an inverted conical shape in which the upper half has the same diameter over the entire length in the vertical direction and the lower half has a diameter that becomes smaller as it goes downward. However, since the shoulders on both sides of the upper half of the sedimentation tank protruded from the parts of the upper part of the housing located on both sides in the axial direction of the housing, the dimensional limitations of the housing caused the shoulders of the sedimentation tank to This relaxation allows the length of one side of the sedimentation tank where the water surface is located to be increased, ensuring the specified capacity, and also has the advantage that the construction of the septic tank can be improved by incorporating the sedimentation tank. There is.

[Brief explanation of drawings]

Fig. 1 is a front view showing the construction state of a conventional septic tank, Fig. 2 is an explanatory diagram of the capacity of the above settling tank, Fig. 3 is a front view of the settling tank of the present invention, and Fig. 4 is a broken perspective view of the same above. , FIG. 5 is an explanatory diagram of the capacity of the sedimentation tank, and FIGS. 6 and 7 are production process diagrams of the same.
1 is an upper half, 2 is a lower half, 3 is a settling tank, 4 is a housing, and 5 is a shoulder.

Claims (1)

[Claims] 1. A sedimentation tank with an inverted conical shape in which the upper half has the same diameter over the entire length in the vertical direction and the lower half becomes smaller in diameter as it goes downwards is built into a horizontal cylindrical housing, and the upper part of the housing is A septic tank with a built-in sedimentation tank, characterized in that shoulders on both sides of the upper half of the sedimentation tank protrude from parts located on both sides in the axial direction of the housing.