JP2017164729A - Purification tank and storage or transportation method for purification tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a purification tank which can reduce storage space when storing the purification tank, and a storage method and transportation method therefor.SOLUTION: The purification tank has a bottom wall, a side wall and a ceiling wall, the side wall has a pair of side walls on the shorter side and a pair of side walls on the longer side, and the side walls on the shorter side are provided with projections for standing support at predetermined intervals.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a septic tank excellent in storability for treating sewage such as domestic wastewater, and a storage method and transport method thereof.

  Most of the septic tanks are produced in large quantities at the factory and stored in large quantities near the production site. And it is transported by a large truck to the remote place from the storage place.

Japanese Patent Laid-Open No. 11-347577 JP 2004-136925 A JP 2001-029972 A

Even if the septic tank is small, it has a volume of about 2 to ³ m ³ and an installation area of about 2 m ² , and a large storage space is required when storing a large amount.
The prior art described in Patent Document 1 proposes a method for efficiently stacking parts before assembly of the septic tank.
However, the method for storing the septic tank after assembly is not disclosed, and there is a problem that a vast storage space is required.

Further, when the septic tank is transported by a large truck, it is necessary to transport as many septic tanks as possible in one transport from the viewpoint of reducing transportation costs and CO ₂ emission related to transportation.
The prior art described in Patent Document 2 proposes a method of stacking two septic tanks and transporting a large number of septic tanks at one time. There was a problem such as safety at the time.

  In consideration of safety during transportation, a method for stabilizing the septic tank is proposed in Patent Document 3, but a method for transporting a large number of septic tanks at one time is not proposed.

  The present invention has been made in view of the above-described conventional problems, and provides a septic tank that can reduce the storage space and the installation space during transportation when storing or transporting the septic tank, and a storage method and transport method thereof. is there.

The present invention has the following configuration as means for solving the above problems.
(1) The present invention includes a bottom wall, a side wall, and a ceiling wall, and the side wall includes a pair of side walls on the short side and a pair of side walls on the long side. A part is provided.
(2) In the present invention, the bottom wall side portion of the tip line of the convex portion is connected to the bottom wall so as to converge on the bottom wall bottom surface, and the bottom line of the bottom wall and the convex It is preferable that the intersection part with the front end line of the part is chamfered in a substantially arc shape.
(3) In the present invention, the upper outer shell including the ceiling wall and the lower outer shell including the bottom wall and the side wall are flange-bonded, and the height of the lower outer shell is higher than the height of the upper outer shell. Is preferably high.

(4) In this invention, it was comprised so that the side surface of the short side in which the said convex part was formed might be a side near the gravity center of the whole septic tank rather than the center of the length of the whole septic tank seeing from the side surface of a long side. It is preferable.
(5) In the present invention, an anaerobic treatment tank, an aerobic treatment tank, a solid-liquid separation tank, and a disinfection tank are provided from the short side wall side where the convex part is not provided to the side wall side where the convex part is provided. It is preferable that the total weight of the aerobic treatment tank, the solid-liquid separation tank, and the disinfection tank on the rear stage side is larger than the weight of the anaerobic treatment tank on the front stage side.

(6) The storage method of the septic tank according to the present invention is characterized in that when storing the septic tank according to any one of the above, the septic tank is stored in an upright state with the short side surface provided with the convex portion down.
(7) The method for transporting the septic tank according to the present invention is characterized in that when transporting the septic tank according to any one of the above, the septic tank is transported in an upright state with the short side surface provided with the plurality of convex portions down. To do.
(8) In the method for transporting the septic tank according to the present invention, it is preferable that the convex portion provided on the longitudinal side wall is placed on the claw of the forklift and moved.

  According to the present invention, the convex portion provided on one short side wall can be used as the convex portion for standing up the septic tank, and the short side wall is directed downward toward the installation surface. The septic tank can be stored, supported and transported in the state. For this reason, the space for storage can be reduced, and the installation space during transportation can also be reduced. According to the present invention, the storage space and the installation space can be reduced, so that the storage space for storing a large amount of septic tanks can be greatly reduced, and the installation space for transporting a large amount of septic tanks can be greatly reduced.

It is a perspective view of a septic tank in a 1st embodiment of the present invention. It is the side view which looked at the septic tank shown in FIG. 1 from the longitudinal side. It is the elements on larger scale of the septic tank shown in FIG. It is a perspective view which shows the state which stored the septic tank shown in FIG. It is the figure which looked at the septic tank of 2nd Embodiment from the short side. It is a figure which shows the relationship between the state which stored the septic tank shown in FIG. 5, and the nail | claw of a forklift.

Hereinafter, the details of the present invention will be described with reference to the accompanying drawings by way of embodiments of the present invention.
FIG. 1 is a perspective view of the sewage septic tank of the first embodiment of the present invention, and FIG. 2 is a side view of the sewage septic tank.
As shown in FIGS. 1 and 2, the sewage purification tank 1 of the present embodiment is a five-person tank, which is a minimum human tank having a length L: 2 m, a width W: 1 m, and a height H: 1.5 m. The sewage septic tank 1 is composed of an upper outer shell 2 constituting the upper side and a lower outer shell 3 constituting the lower side, and the upper outer shell 2 and the lower outer shell 3 are joined to each other by a flange portion 2a. ing.

The sewage septic tank 1 has a substantially horizontally long rectangular box shape, and includes a bottom wall 1A, side walls 1B, 1B, 1C, 1C erected from the periphery of the bottom wall 1A and a ceiling wall 1D provided on the upper side thereof. Become. In the septic tank 1, the side walls 1 </ b> B and 1 </ b> B are long side walls, and the side walls 1 </ b> C and 1 </ b> C are short side walls. Since the septic tank 1 has a structure that is vertically divided from the upper outer shell 2 and the lower outer shell 3, the side walls 1B and 1C are also divided into two upper and lower sides, and the upper side of the side walls 1B and 1C is the upper outer shell. 2, and the lower sides of the side walls 1 </ b> B and 1 </ b> C are integrated as a part of the lower outer shell 3. For this reason, the upper side of the side walls 1B and 1C and the ceiling wall 1D are integrated to form the upper outer shell 2, and the lower side of the side walls 1B and 1C and the bottom wall 1A are integrated to form the lower outer shell 3. It is configured. In the example of FIG. 1, about 75% of the total height of the side walls 1B, 1C is set to the height of the lower outer shell 3, and the remaining 25% is set to the height of the upper outer shell 2. These height relationships will be described later again.
In the septic tank 1, the side walls 1B and 1C are slightly narrowed as a whole, so that the bottom wall 1A is slightly narrower in both the vertical and horizontal widths than the ceiling wall 1D.
Further, the side wall 1B has a structure reinforced by alternately forming a plurality of vertical strip-shaped protrusions 1E and concave grooves 1F at a predetermined interval in the width direction, and the side wall 1C also has a predetermined structure in the width direction. The structure is reinforced by alternately forming a plurality of vertical belt-like protrusions 1E and concave grooves 1F at intervals of. Note that a protrusion 1E is formed on the bottom wall 1A side so as to extend these protrusions 1E, and a groove 1F is formed adjacent to the protrusion 1E. In this example, five protrusions 1E are provided alternately with the concave grooves 1F in the width direction of the side surface 1B. The protrusion 1E on one side in the width direction of the side wall 1B is adjacent to and integrated with the protrusion 1E on one side in the width direction of the side wall 1C adjacent thereto.
These protrusions 1E and grooves 1F are provided to reinforce the sewage septic tank 1. However, the number of these protrusions 1E and grooves 1F may be arbitrary. It does not matter.
As shown in FIGS. 1 and 2, the side wall 1C on the short side is formed with three projections 1E in the width direction, and the surface of the side wall 1C is formed at the center in the width direction of each projection 1E. On the other hand, protruding piece-like convex portions 4a (first convex portions), 4b (second convex portions), and 4c (third convex portions) are formed so as to extend vertically.

In the present embodiment, these convex portions 4a to 4c are formed only on the side wall 1C on the lower outer shell 3 side. The upper ends of the convex portions 4a to 4c extend to a position directly below the flange portion 2a, and the lower ends of the convex portions 4a to 4c extend to a portion close to the bottom wall 1A.
In the present embodiment, the convex portions 4a to 4c are provided only on the lower outer shell 3, but the positions at which the convex portions 4a to 4c are provided are not limited to the lower outer shell 3, but the upper outer shell 2 side. Alternatively, a convex portion may be provided.

The sewage septic tank 1 will be further described in detail with reference to FIGS. 2, 3, and 4.
In the sewage septic tank 1 of this embodiment, as shown in FIG. 3, the convex portions 4a, 4b, and 4c are configured to have substantially the same height as the flange portion 2a in the vicinity of the flange portion 2a. There is no limitation in particular in the number of the convex parts provided in the sewage septic tank 1.
In consideration of the production tolerance of the sewage septic tank 1, in the present embodiment, as shown in FIG. 3, the protrusions 4a, 4b and 4c are arranged at the upper ends of the protrusions 4a, 4b and 4c so as not to interfere with each other. A notch 4k is provided.

As shown in FIGS. 1 and 2, the tip line 4 s of the convex portion 4 a is sewage as it goes downward at an angle α of 2 degrees (see FIG. 3) with respect to the vertical plane when the sewage septic tank 1 is installed horizontally and horizontally. It is inclined so as to approach the septic tank 1. The tip line 4s indicates a trajectory drawn by the tip of the convex portion 4a when the convex portion 4a is viewed from the side as shown in FIG. Since the convex portions 4a, 4b, and 4c are all formed in the same shape, each tip line 4s of the convex portions 4a, 4b, and 4c is drawn so as to overlap one tip line 4s in the state shown in FIG. ing. Further, the tip line 4s has an inclination of 2 degrees with respect to the vertical plane, but the side wall 1C is inclined so as to be constricted at a larger angle, so that the protrusion 4a protrudes from the side wall 1C. The side closer to the bottom wall 1A is made larger than the side closer to the flange portion 2a.
The angle α is set to 2 degrees, as shown in FIG. 4, with the side surface 1C on the short side provided with the convex portions 4a, 4b, and 4c facing down, and the sewage septic tank 1 standing on the installation surface such as the floor In order to prevent the sewage septic tank 1 from rotating 90 degrees with the momentum of rotating the sewage septic tank 1 by 90 degrees, the sewage septic tank 1 is stopped in a state immediately before 90 degrees instead of 90 degrees.

When the angle α is 2 degrees, when the short side surface 1C is turned down, the septic tank 1 is stored in a state rotated by 88 degrees with respect to the installation surface (horizontal plane).
This angle α is not limited to 2 degrees. The sewage septic tank 1 should be tumbled 180 degrees with the momentum it stands. However, if the angle α is too large, the sewage septic tank 1 may become unstable during storage and may fall to the bottom side due to wind or earthquake. Therefore, the angle α is preferably about 1 to 5 degrees for practical use.

The tip lines 4s of the convex portions 4a, 4b, and 4c are all converged to the bottom surface of the bottom wall 1A. The bottom surface of the bottom wall 1A can be defined as a plane including the top surfaces of all the protrusions 1E existing on the bottom wall 1A side, since the plurality of protrusions 1E and the concave grooves 1F are formed on the bottom wall 1A.
In the case of this embodiment, the intersection of the tip line 4s and the bottom line of the bottom wall 1A is chamfered by an arc R having a curvature radius of about 150 mm. However, the radius of curvature of the arc R is not limited to 150 mm. The radius of curvature of the arc R is determined by the length L of the sewage septic tank 1. As the length L of the sewage septic tank 1 increases, the radius of curvature R is preferably increased in proportion.

This is because when the sewage septic tank 1 is rotated approximately 90 degrees so that the side surface 1C on the short side faces down, the larger the radius of curvature of the arc R can be rotated with less force. However, since the radius of curvature of the arc R is increased, the installation portion between the convex portions 4a to 4c and the installation surface is reduced, which is disadvantageous in terms of stabilization during storage. Therefore, it is determined according to the length L of the septic tank. It is what
Therefore, it is desirable to make the radius of curvature of the arc R small in the sewage septic tank 1 having a small length L, and to make the radius of curvature of the arc R large in the sewage septic tank 1 having a large length L.
In the sewage septic tank 1 having a length L of about 2 m, it is practical and preferable that the radius of curvature of the arc R is about 100 to 250 mm.

The sewage septic tank 1 according to the present embodiment includes, as an example, an upper outer shell 2 having a height Ha: 0.4 m and a lower outer shell 3 having a height Hb: 1.1 m, and is provided on a side surface 1C on the short side. Further, the length of the tip line 4s of the convex portions 4a to 4c of the lower outer shell 3 can be set to 0.9 m.
When the sewage septic tank 1 is stored on the installation surface in a standing state as shown in FIG. 4 with the side surface 1C on the short side facing down, the tip line 4s portion becomes a portion in contact with the installation surface. In this storage state, the length L of the side surface 1B on the long side is the storage height of the sewage septic tank 1.
In addition, what is shown with the code | symbol 10 in FIG. 1, FIG. 2 is the manhole 10 which closes the inspection port formed in the ceiling wall 1D of the sewage septic tank 1. FIG.

Here, the earthquake resistance calculation with respect to the earthquake in the case of storing the septic tank 1 in the standing state will be described.
The horizontal force P is expressed by P = weight of the sewage septic tank W × horizontal seismic intensity K, and W = 2 kN and K = 0.3. The overturning moment Me due to the earthquake is Me = P × storage height × 1/2 = (2 × 0.3) × 2 × 1/2 = 0.6 kN · m. The restoring moment Mr with respect to overturning is Mr = self weight of the sewage septic tank W × 4 s × 1/2 = 2 × 0.9 × 2 × 1/2 = 0.9 kN · m.
Therefore, the overturning moment Me of the sewage septic tank 1 is less than the restoring moment Mr, and the overturning does not cause a fall.

Furthermore, the wind resistance calculation with respect to a wind load is demonstrated with respect to the sewage septic tank 1. FIG.
The wind load F is expressed by F = resistance coefficient C × design speed q × pressure receiving area A, and the resistance coefficient C = 0.8 and the design speed pressure q = 0.54 kN / m ² . The overturning moment Mw due to the wind is Mw = F × storage height × 1/2 = (0.8 × 0.54 × 2 × 1) × 2 × 1 / 2≈0.87 kN · m.
Therefore, the overturning moment Mw of the sewage septic tank 1 is less than the restoring moment Mr, and the sewage septic tank 1 is not overturned by the wind described above.

When providing convex portions on the side surface 1C on the short side, it is more efficient to provide the convex portions 4a to 4c only on the lower outer shell 2 than to provide convex portions on both the upper outer shell 2 and the lower outer shell 3. Is good. However, as shown above, if the tip line 4s is short, the restoring moment Mr becomes small, and if there is an earthquake or strong wind during storage of the sewage septic tank 1, there is a risk of falling.
In the case of the present embodiment, when the tip line 4s is less than 0.87 m, the falling moment Mw> the restoring moment Mr, and the risk of falling comes out. Therefore, when the convex portions 4 a to 4 c are provided only on the lower outer shell 3, the height of the lower outer shell 3 needs to be higher than the height of the upper outer shell 2. The ratio of the tip line 4s to the total height H: 1.5 m is (1.5 ÷ 0.9 =) 60%, and considering the R at the convergence end, the height Hb of the lower outer shell 3 is at least the total height H. 70% is required.

  Although the length of the tip line 4s has been described above, the tip line 4s does not have to be a continuous straight line. In the state where two or more notches are provided in the middle of the protrusions 4a to 4c and the short side 1C is down, the forklift tabs are inserted into the notches from the outside of the long side. It may be used as a guide for transporting the septic tank 1.

When the sewage septic tank 1 is transported and stored for a short distance with the side 1C on the short side down, the center of gravity of the sewage septic tank 1 can be operated in a stable state closer to the side 1C on the short side. .
In order to set the center of gravity of the sewage septic tank 1 to the side 1C side on the short side, the arrangement of the internal components of the sewage septic tank 1 must be considered.

For example, an anaerobic treatment tank, an aerobic treatment tank, a solid-liquid separation tank, and a disinfection tank are formed by flowing the treatment flow of the septic tank from the inflow side to the outflow side. The anaerobic treatment tank is divided into two chambers, a precipitation separation tank and an anaerobic filter bed tank, and an aerobic treatment tank is a contact aeration tank or a carrier flow tank. You may provide a flow volume adjustment part in the upper part of an anaerobic processing tank.
The anaerobic filter tank is filled with filter media. The contact aeration tank is filled with a contact material, and in the case of a carrier fluidized tank, the carrier is filled. These aerobic treatment tanks are provided with a diffuser. Furthermore, a circulation device is also provided, and the air lift pump of the circulation device is disposed in the solid-liquid separation tank. Piping is arranged in each tank.

In the case of this structure, there are few members to be accommodated in the preceding settling separation tank, anaerobic filter bed tank, and flow rate adjusting unit, and members to be accommodated in the subsequent contact aeration tank or carrier flow tank, solid-liquid separation tank, and disinfection tank. Will increase.
In this case, as shown in FIG. 1 and FIG. 2, a treatment drainage intake 5a is provided on one short side surface 1C of the sewage septic tank 1, and a discharge port 5b is provided on the other short side surface 1C. If so, the outflow side is heavier than the inflow side of the sewage septic tank 1, and the center of gravity of the sewage septic tank 1 can be arranged closer to the outflow side.
Therefore, it is desirable to set the short side 1C on the outflow side and provide the convex portions 4a to 4c on the short side 1C.

In another example, similarly, the anaerobic treatment tank 1 is divided into two tanks, an anaerobic filter floor tank first chamber and an anaerobic filter floor tank second chamber, and a flow rate adjusting unit is provided in the upper part. The aerobic treatment tank is an aeration tank (activated sludge tank).
In this example, the first stage anaerobic filter bed first chamber and the second anaerobic filter bed second chamber have many members, and the latter aeration tank has few members. If the sewage purification tank 1 is configured as described above, the inflow side is heavier than the outflow side, and the center of gravity of the sewage purification tank 1 can be disposed closer to the inflow side.
Therefore, in this case, the short side surface 1C on the inflow side may be used, and the convex portions 4a to 4c may be provided on the short side surface 1C. Protrusions 4a to 4c are provided on the side opposite to the structure of the sewage septic tank 1 shown in FIGS.
Thus, the arrangement of the convex portions 4a to 4c on the short side surface can be determined by how the center of gravity of the septic tank is arranged.

When the sewage septic tank 1 is stored or transported, as shown in FIG. 4, the sewage septic tank 1 is stored or transported with the short side surface 1C on which the convex portions 4a, 4b, and 4c are disposed facing down.
In this embodiment, the storage space (length L: 2 m × width W: 1 m =) 2 m ^{2 is} required in the normal storage state shown in FIG. 1 and FIG. 2, but the short side surface 1 C is down. Then, (width W: 1 m × height H: 1.5 m =) becomes 1.5 m ² , and the storage space can be reduced by 25%.
Similarly, when the sewage septic tank 1 of this embodiment is loaded on a truck and transported, the loading efficiency is improved.
For example, the size of the loading platform of a 10-ton wing car is width W 2.35m x length L 9.6m, so in the normal loading method, it is 2m x (1m x 9 cars =) 9m and 9 cars are loaded. In the stacking method with the side facing down, the stacking can be performed in two rows, so that (1 m × 2 units =) 2 m × (1.5 m × 6 units =) 9 m becomes 12 units, and the stacking efficiency is improved.

"Second Example"
Next, as shown in FIGS. 5 and 6, a second embodiment will be described in which projecting side protrusions 6a and 6b are provided on the long side surfaces 1B and 1B, respectively, similarly to the short side surface 1C. Since other parts are the same as those of the first embodiment, description of other parts is omitted.
The protrusions 6a and 6b of the present embodiment are provided on the lower outer shell 3, and are configured to have substantially the same height as the flange 2a in the vicinity of the flange 2a. In the sewage septic tank 1, five protrusions 1E are intermittently alternately formed on the side surface 1B on the long side. Of these five protrusions 1E, the protrusion 6a extends along the central protrusion 1E. A protrusion 6b is formed along the protrusion 11E at the center of the other long side surface 1B.
On the other hand, in the vicinity of the bottom surface of the bottom wall 1A, the tip lines 6s of the protrusions 6a and 6b converge on the bottom surface of the bottom wall 1A while drawing an arc R on the bottom wall 1A side.

In the case of this embodiment, as shown in FIG. 6, when the sewage purification tank 1 is installed on the installation surface with the side surface 1C on the short side facing down, the protrusions 6a and 6b are arranged substantially horizontally.
In this state, the forklift claws 7 and 7 are horizontally inserted from the outside of the bottom wall 1A along the edges of the protrusions 6a and 6b, and the protrusions 6a and 6b are sandwiched between the forklift claws 7 and 7, When the claws 7 and 7 are raised after placing the projections 6a and 6b on the top 7, the septic tank 1 can be lifted and moved by a forklift, so that there is an effect that the moving operation can be performed safely.

By the way, in 1st, 2nd embodiment demonstrated previously, although the three convex parts were provided in 1 C of short sides, the number of protrusions provided in 1 C of side surfaces may be arbitrary. In the example shown in the figure, the convex portions provided on the side surface 1C have convex portions 4a and convex portions 4c provided on both sides in the width direction of the side surface 1C. In other words, if the convex portions are provided on both sides in the width direction of the side surface 1C, The septic tank 1 can be stably supported. Of course, four or more convex portions may be provided on the side surface 1C.
Further, the shape of the convex portion is not limited to the shape of a protruding piece as shown in the figure, but is a shape in which a plurality of cylindrical or prismatic projections are arranged, a lattice shape, or a flat portion including a convex tip line 4s. A large convex part (for example, one convex part occupying 70% or more of the height of the side surface 1C and 70% or more of the width) may be used. In short, it is only necessary to provide one or more convex portions having a surface capable of stably supporting the sewage septic tank 1 in an upright state on the installation surface at an angle of 85 to 89 degrees.

  DESCRIPTION OF SYMBOLS 1 ... Waste water purification tank, 1A ... Bottom wall, 1B ... Long side surface, 1C ... Short side wall, 1D ... Ceiling wall, 2 ... Upper outer shell, 2a ... Flange, 3 ... Lower outer shell, 4a ... First convexity Part, 4b ... second convex part, 4c ... third convex part, 4s ... tip line, 6a ... first convex part, 6b ... second convex part, 7 ... forklift claw, L ... length, W: Width, H: Height, Ha: Upper outer shell height, Hb: Lower outer shell height, R: Arc.

Claims (8)

  A bottom wall, a side wall, and a ceiling wall, the side wall comprising a pair of side walls on the short side and a pair of side walls on the long side, and a convex part for standing support provided on the side wall on the short side; Characterized septic tank.   2. The septic tank according to claim 1, wherein the bottom wall side portion of the tip end line of the convex portion is connected to the bottom wall so as to converge on the bottom wall bottom surface, and the bottom line of the bottom wall The septic tank characterized in that the intersection of the convex portion with the tip line is chamfered in a substantially arc shape.   3. The septic tank according to claim 1, wherein an upper outer shell including the ceiling wall and a lower outer shell including the bottom wall and the side wall are flange-joined, and the height of the lower outer shell is the height. A septic tank characterized by being higher than the height of the upper outer shell.   The septic tank according to any one of claims 1 to 3, wherein the side surface on the short side where the convex portion is formed is closer to the entire septic tank than the center of the length of the entire septic tank when viewed from the side surface on the long side. A septic tank characterized by being configured to be closer to the center of gravity.   5. The septic tank according to claim 4, wherein an anaerobic treatment tank, an aerobic treatment tank, a solid-liquid separation tank, and a disinfection tank are provided from a short side wall side not provided with the convex part to a side wall side provided with the convex part. A septic tank characterized in that the total weight of the aerobic treatment tank, the solid-liquid separation tank, and the disinfecting layer on the rear stage side is larger than the weight of the anaerobic treatment tank on the front stage side.   A storage method for a septic tank, wherein the septic tank according to any one of claims 1 to 5 is stored in an upright state with a short side surface provided with the convex portion down.   A transportation method of a septic tank, wherein the septic tank according to any one of claims 1 to 5 is transported in an upright state with a short side surface provided with the plurality of convex portions down. .   8. The method for transporting a septic tank according to claim 7, wherein the convex portion provided on the longitudinal side wall is placed on a claw of a forklift and moved.

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