JP2000005776A - Septic tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance productivity and to reduce a cost by easily changing shapes of a receiving grid and holding-down grid with respect to a change in the size (length in plane view) of a septic tank. SOLUTION: A receiving grid 3 and the holding-down grid 4 are formed to a rotationally symmetrical shape around the rotationally symmetrical axis X in the plane view shape of an aerobic tank 2. The grids 3 and 4 are composed of plural sectorial bodies 5a, 5b which have arcuate parts C coinciding with the arcuate shape at the end of the anaerobic tank 2 and vary in the lengths in the longitudinal direction of the rotationally symmetrical axis X and plural rectangular bodies 6a and 6b which have straight parts L coinciding with the straight shape of the intermediate part of the tank and vary in the lengths in the longitudinal direction of the rotationally symmetrical axis X.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a septic tank in which a filter medium group of small pieces is received and held between a lattice and a holding lattice in an anaerobic tank of a tank main body. The present invention relates to a technique for easily changing the shapes of the receiving grid and the holding grid with respect to the change of the height, thereby increasing the productivity and reducing the cost.

[0002]

2. Description of the Related Art Conventionally, in an anaerobic tank of a septic tank, a filter medium is held between a receiving grid and a holding grid. By the way, the capacity of the septic tank is changed depending on the family structure, etc., and the capacity of the septic tank is changed by changing the length in plan view in accordance with the standard. It also changes the size of the grid.

[0003] Therefore, the types of the receiving grid and the holding grid need only be the type of the septic tank, and the productivity is low and the cost is high.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and has been developed in consideration of a change in the size (length in a plan view) of a septic tank. It is an object of the present invention to provide a septic tank capable of easily performing the above-mentioned steps, increasing the productivity and reducing the cost.

[0005]

According to the first aspect of the present invention, the receiving grid 3 and the holding grid 4 have a rotationally symmetrical shape about the rotationally symmetric axis X in the plan view shape of the anaerobic tank 2, and the grids 3 and 3 have the same shape. 4 is provided with an arc-shaped portion C that matches the arc shape of the end of the anaerobic tank 2 and matches a plurality of sectors 5a and 5b having different lengths in the length direction of the rotationally symmetric axis X, and the straight shape of the tank middle portion. And a plurality of rectangular bodies 6a, 6b having different lengths in the length direction of the rotationally symmetric axis X. According to such a configuration, when changing the capacity of the septic tank by changing the capacity of the septic tank according to the family configuration or the like and changing the length of the septic tank in plan view, the anaerobic tank 2 is provided with the arc-shaped portion C that matches the arc shape of the end portion. And a plurality of sectors 5a and 5b having different lengths in the length direction of the rotationally symmetric axis X, and a linear portion L matching the linear shape of the intermediate portion of the tank, and having a length in the length direction of the rotationally symmetric axis X. By selecting and combining a plurality of different rectangular bodies 6a and 6b, it is possible to obtain the receiving grid 3 and the holding grid 4 corresponding to the septic tank whose capacity has been changed.

According to a second aspect of the present invention, the pair of sector bodies 5a and 5b and the rectangular body 6 that are rotationally symmetric about the rotational symmetry axis X are provided.
a and 6b are characterized by having a fitting portion 7 that can be fitted and connected when rotated about the rotational symmetry axis X. According to such a configuration,
The pair of sectors 5a and 5b can be formed in the same shape by making the fitting portion 7 common, and the pair of sectors 5a and 5b can be formed in the same shape, thereby further increasing the productivity of the lattices 3 and 4. It is.

According to a third aspect of the present invention, the edges of the rectangular bodies 6a and 6b along the partition plate 8 provided in a direction substantially perpendicular to the length direction of the rotational symmetry axis X and partitioning the tank are provided with partition plates. 8, a punchable portion 9 which can be fitted with a hose introduction body 11 into which a vacuum hose can be introduced is formed. According to such a configuration, when the sector bodies 5a, 5b or the rectangular bodies 6a, 6b hit the hose introduction body 11,
This is achieved by punching out the punchable portion 9.

According to a fourth aspect of the present invention, a means is provided for attaching the spacer edge plate 10 to the edge of the rectangular bodies 6a and 6b on the tank side. According to such a configuration, the gap between the rectangular bodies 6a, 6b and the tank body is filled by attaching the spacer edge plate 10 to the rectangular bodies 6a, 6b via the attaching means, and the filter medium f is prevented from falling and floating. And to prevent short-circuiting of sewage.

[0009]

Embodiments of the present invention will be described below.

FIG. 1A is a schematic side sectional view, and FIGS. 1B to 1E are schematic perspective views of a sector and a rectangular body. FIG.
Is a schematic exploded perspective view, FIGS. 3 (a) (b) (c), FIG.
(A) (b) (c) is a top view which shows the aspect of the change of the lattice accompanying the change of the capacity of a septic tank.

As shown in FIG. 1, the septic tank A includes, for example,
The first of the anaerobic tank 2 which is a combined septic tank and has a filter medium f
A tank 2a and a second tank 2b, an aeration tank 12 provided with a contact plate 14, and a sedimentation tank 13, for example, a first tank of the anaerobic tank 2 for domestic wastewater from a toilet, a sink, a kitchen, or the like. 2
a, is transferred to the second tank 2b, and the solid content is separated. After that, the sewage as the water to be treated is transferred to the aeration tank 12 by the transfer pump. In the aeration tank 12, an air diffuser 15 for blowing air from a blower is provided. For intermittent aeration from the air diffuser 15, activated sludge (aerobic) treatment by microorganisms for biological decomposition and nitrogen removal. (Anaerobic) treatment is performed.

The septic tank A is, for example, a tank for 5 to 10 persons (5 to 5 persons).
The anaerobic tank 2 has a starting tank section 16 forming the first tank 2a, an intermediate tank section 17 forming the second tank 2b, an aeration tank 12 and a sedimentation tank 13. It is constituted by combining the terminal tank portion 18 with the partition plate 8 interposed therebetween. These tank portions 16, 17, 18 are, for example, divided into upper and lower parts, so that the upper and lower divided halves 20 can be connected to each other by, for example, bolts by abutting flanges 21.

The septic tank A as described above is made to have the capacity set according to the number of users, that is, for example, a large intermediate tank portion 17 (having a long plan view length),
The number of the intermediate tank portions 17 is increased or decreased.

In the first tank 2a and the second tank 2b of the anaerobic tank 2, the receiving grid 3 and the pressing grid 4 hold filter media f as follows.

First, the inner surface of the side wall of the first tank 2a and the partition plate 8
Receiving bar 23 and receiving grid 3
With rivets, for example. A filter medium f is laid on the receiving bar 23. Place the holding grid 4 on the filter media f group,
The holding bar 25 is connected to the upright pipe 24 of the receiving bar 23 at the connection portion 26 and the holding bar 25 holds the holding grid 4. A holding table 27 is attached to the partition plate 8 to hold the holding grid 4.

The partition plate 8 is provided with a semi-tubular hose introduction body 11 as necessary, so that a vacuum hose can be introduced to suck and remove sludge at the bottom of the tank.

When it is desired to change the capacity of the septic tank A on the corn, the receiving grid 3 and the holding grid 4 are selected and used so that the dedicated grid does not have to be used. In addition, the cost of the holding grid 4 and the cost of the septic tank A can be reduced. Less than,
Such a configuration will be described in detail. As shown in FIGS. 1B to 1E, the receiving grid 3 and the holding grid 4 are centered on a rotationally symmetric axis X (a central axis along the length direction of the purification tank A) in the plan view shape of the anaerobic tank 2. It has a rotationally symmetric shape. Furthermore,
The receiving grid 3 and the holding grid 4 are each provided with an arc-shaped portion C that matches the arc shape of the end of the first tank 2a of the anaerobic tank 2 and have a plurality of sectors 5a having different lengths in the length direction of the rotational symmetry axis X. 5b, and a plurality of rectangular bodies 6a and 6b having a linear portion L that matches the linear shape of the intermediate portion of the tank and having different lengths in the length direction of the rotationally symmetric axis X.

According to such a configuration, when changing the capacity of the septic tank A in plan view by changing the capacity of the septic tank A according to the family structure or the like, it matches the arc shape of the end of the anaerobic tank 2. A plurality of sectors 5a, 5b having an arc-shaped portion C and having different lengths in the length direction of the rotationally symmetric axis X.
And a plurality of rectangular bodies 6a, 6b having a linear portion L that matches the linear shape of the intermediate portion of the tank and having different lengths in the length direction of the rotationally symmetric axis X. According to this, the receiving grating 3 and the holding grating 4 can be obtained.

That is, for example, as shown in FIG. 3A, the sector 5 having a long length in the direction of the rotational symmetry axis X of the septic tank A is used.
a and a form using a rectangular body 6b having a short length, FIG.
As shown in FIG. 5, a form using a long sector 5a and a long rectangular body 6a, a form using a long sector 5a and two short rectangular bodies 6b, 6b as shown in FIG. FIG.
Various combinations shown in (a), (b) and (c) can be obtained.

As shown in FIG. 5, in the rectangular bodies 6a and 6b which are rotationally symmetric about the rotational symmetry axis X, a fitting portion 7 which can be fitted and connected when rotated about the rotational symmetry axis X is provided. Have. Specifically, a fitting piece 28 having a thickness of approximately １ ／ of the thickness of the edge portion 29 is attached to one end of the rectangular body 6a so as to be shifted to one end of the rectangular body 6a. . Thus, as shown in FIG.
Thus, the rectangular bodies 6b, 6b are connected by fitting 28 in a jerking manner. A through hole 32 is formed in the fitting piece 28, and bolts or rivets are inserted into the matching through holes 32, 32 and connected.

According to this configuration, the pair of sector bodies 5a and 5b can be formed in the same shape by making the fitting portion 7 common.
The pair of sector bodies 5a and 5b can be made the same shape,
The productivity of the lattices 3 and 4 is further enhanced.

As shown in FIG. 6, the edges of the rectangular bodies 6a and 6b along the partition plate 8 correspond to the hose introduction body 11 attached to the partition plate 8 and capable of introducing a vacuum hose. A punchable portion 9 which can be formed is formed. The size of the mesh of the punchable portion 9 is naturally smaller than the size of the filter medium f. Thus, if necessary, the punchable portion 9 may be punched.

As shown in FIG. 7, there is provided means for attaching the spacer edge plate 10 to the edge 30 on the tank side of the rectangular bodies 6a and 6b. Specifically, hook-shaped locking claws 31 are provided on the upper and lower surfaces of the edge 30 on the tank side. According to such a configuration, by attaching the spacer edge plate 10 to the locking claw 31,
When the edges 30 of the rectangular bodies 6a and 6b match the inner surface of the tank having a complicated shape by forming ribs and the like, the filter medium f is prevented from dropping and floating, and is prevented from short-circuiting with sewage. In addition, the shape of the edge 30 on the side of the rectangular bodies 6a and 6b is prevented from becoming complicated.

[0024]

According to the first aspect of the present invention, the receiving grid and the holding grid have a rotationally symmetric shape centered on a rotationally symmetric axis in the plan view of the anaerobic tank, and the grid has an arc shape at the end of the anaerobic tank. A plurality of sector bodies having a matching arc-shaped portion and different lengths in the length direction of the rotationally symmetric axis, and a straight portion matching the linear shape of the tank middle portion, and having a length in the length direction of the rotationally symmetric axis. Since it is composed of a plurality of different rectangular bodies, the arc shape that matches the arc shape of the end of the anaerobic tank when changing the capacity of the septic tank in plan view by changing the capacity of the septic tank according to family structure etc. Parts with different lengths in the length direction of the rotationally symmetric axis, and a linear part that matches the linear shape of the middle part of the tank and different lengths in the length direction of the rotationally symmetric axis By selecting combinations with the number of rectangular bodies, it is possible to obtain a receiving grid and a holding grid corresponding to the septic tank whose capacity has been changed, so that it is not necessary to produce various sizes as in the prior art. There is an advantage that the productivity of the grating and the holding grating can be increased and the cost can be reduced.

According to a second aspect of the present invention, the pair of sector bodies and the rectangular body that are rotationally symmetric about the rotational symmetry axis are provided with a fitting portion that can be fitted and connected when rotated about the rotational symmetry axis. Therefore, in addition to the effect of the first aspect, the fitting portion can be made common and the pair of sectors can be formed in the same shape, and the pair of sectors can be formed in the same shape, further improving the productivity of the lattice. There is an advantage that can be.

In a third aspect, the edge of the rectangular body along the partition plate provided in a direction substantially perpendicular to the length direction of the rotationally symmetric axis and partitioning the tank is attached to the partition plate. In addition to the effect of claim 1, in the case where a fan-shaped body or a rectangular body hits the hose introduction body, a punchable portion that can match the hose introduction body that can introduce a vacuum hose can be formed. Has an advantage that it can be dealt with by punching a punchable portion.

According to a fourth aspect of the present invention, there is provided means for attaching a spacer edge plate to the edge of the rectangular body on the tank side. In addition to the effect of the first aspect, the spacer edge plate is attached to the rectangular body via the mounting means. By mounting the filter, it is possible to fill the gap between the rectangular body and the tank body, and there is an advantage that it is possible to prevent the filter medium from falling and floating and to prevent a short circuit of the sewage.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, (a) is a schematic side sectional view, (b) is a schematic perspective view of a long fan, (c) is a schematic perspective view of a short fan, and (d) is long. Schematic perspective view of a rectangular body,
(E) is a perspective view of a long rectangular body.

FIG. 2 is a schematic exploded perspective view of the same.

FIGS. 3 (a), (b) and (c) are plan views showing a manner of changing a lattice in accordance with a change in capacity of a septic tank.

FIGS. 4 (a), (b) and (c) are plan views showing aspects of changing a lattice in accordance with a change in capacity of a septic tank.

FIG. 5A is a perspective view showing a fitting portion of the above, and FIG. 5B is a sectional view.

FIG. 6 is a schematic perspective view of a rectangular body showing a punchable portion of the above.

FIG. 7 is a perspective view showing a means for attaching the spacer edge plate of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank main body 2 Anaerobic tank 3 Receiving grid 4 Holding grid 5a Sector 5b Sector 6a Rectangular body 6b Rectangular body 7 Fitting part 8 Partition plate 9 Punchable part 10 Spacer edge plate 11 Hose introduction body

Claims (4)

[Claims] 1. A purification tank in which a filter medium group of small pieces is received in an anaerobic tank and held between a grid and a holding grid, wherein the grid has a rotationally symmetric shape centered on a rotational symmetry axis in a plan view shape of the anaerobic tank. A plurality of sectors having an arc-shaped portion matching the arc shape of the end of the anaerobic tank and having different lengths in the length direction of the rotationally symmetric axis, and a straight line matching the straight shape of the tank middle portion. And a plurality of rectangular bodies having different lengths in the length direction of the rotationally symmetric axis. 2. A pair of sector bodies and a rectangular body that are rotationally symmetric about a rotational symmetry axis are provided with a fitting portion that can be fitted and connected when rotated about the rotational symmetry axis. The septic tank according to claim 1, wherein 3. A vacuum hose attached to the partition plate at an edge of a rectangular body along a partition plate provided in a direction substantially orthogonal to the length direction of the rotationally symmetric axis and partitioning the tank. The septic tank according to claim 1, further comprising a punchable portion that can be fitted to a hose introduction body into which the hose can be introduced. 4. The septic tank according to claim 1, further comprising means for attaching a spacer edge plate to an edge of the rectangular body on the tank side.