JPH06280299A - Pump system for sewage - Google Patents

Abstract

(57) [Summary] [Purpose] A large wastewater storage is formed between the inner surface of the manhole and the pre-swirl tank. A pre-swirl tank 20 is installed in a right-cylindrical manhole 10 having a constant inner diameter from the bottom surface to the upper end surface, and a pair of submersible pumps 30 are provided in a pair of swirl recesses 21 in the pre-swirl tank 20, respectively. Will be placed. Each submersible pump 30 is guided by a pair of guide pipes 54 arranged along the inner peripheral surface of the manhole 10. Each of the guide pipes 54 has an upper end portion located closer to the inner peripheral surface of the manhole 10 than the manhole 10 in the inner peripheral surface of one opening 12 which is eccentric with respect to the manhole 10 and is located farther from the axial center of the manhole 10. Are arranged. Between the pre-rotation tank 20 and the inner peripheral surface of the manhole 10, there is a wide storage section 15 for storing waste water.
Is formed. The dirty water in the storage portion 15 swirls into each swirling recess 21 from each inflow groove 22 of the pre-swirl tank 20, and is pumped up by the submersible pump 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed to remove sewage once in the middle of the sewage pipe so that the sewage naturally flows in the sewage pipe.
Pumping system for sewage pumped up.

[0002]

2. Description of the Related Art When sending sewage to a sewage treatment plant,
Natural flow is economical. However, if the sewage pipeline extends over a long distance, the sewage is delivered to a deep place in the ground in the sewage treatment plant only by natural flow. For this reason, several pump systems are usually arranged in the middle of the sewer line. Each pump system has a manhole into which sewage flows and a submersible pump that pumps up the sewage that has flowed into the manhole. The sewage pumped up by each pump system is again fed by gravity flow.

Recently, a pump system has been developed in which a pre-swirl tank swirls sewage when the sewage flowing into a manhole is pumped up by an underwater pump. FIG. 4 shows an example of such a pump system. In this pump system, a standardized manhole 91 is used, and the maximum inner diameter of the manhole 91 is 1500.
It is in mm. An opening 92 exposed on the ground surface is provided on the upper end surface of the manhole 91. This opening 92
Has an inner diameter of 900 mm and is arranged eccentrically with respect to the axial center of the manhole 91. Opening 9
In the upper part of the manhole 91 below 2, one side is a vertical straight wall 91a, while the other side facing the straight wall 91a is inclined. It has become a slanted wall portion 91b.

In such a manhole 91, the slanted wall portion 9
Since the step for raising and lowering cannot be provided on the inner peripheral surface of 1b, the straight wall portion 91a facing the slant wall portion 91b is provided.
A plurality of elevating steps 93 are provided along the inner peripheral surface of the opening and bottom at appropriate intervals in the vertical direction from the opening to the bottom.

At the bottom of the manhole 91, there is a pre-swirl tank 94.
Has been installed. The pre-swirl tank 94 has a pair of cylindrical swirl recesses 94a into which swirl water flows while swirling, and the waste water in each swirl recess 94a is disposed in each swirl recess 94a. It is pumped up by 95 and discharged to the discharge pipe 96 arranged vertically along the inner peripheral surface of the manhole 91. The submersible pump 95 is suspended in the manhole 91 so that the suction port is immersed in each swirling recess 94a in the pre-swirl tank 94. The submersible pump 95 and the discharge pipe 96 arranged in the manhole 91 are connected to each other. Are connected by a discharge pipe connecting fitting 97.

The submersible pump 95 disposed in the pre-swirl tank 94 installed at the bottom of the manhole 91 is
1 is loaded from one opening 92 provided on the upper end surface. When carrying the submersible pump 95 into the manhole,
Usually, as disclosed in Japanese Utility Model Publication No. 63-49600, a pair of guide pipes 98 arranged in a mutually twisted state are inserted into and fixed to the guide pipes 98 through the openings 92. A method of lowering the submersible pump 95 is adopted.

[0007] In such a pump system, since the dirty water turns into a swirling flow and flows into the swirling recess 94a, there is no possibility that foreign matter mixed in the dirty water will accumulate on the bottom of the manhole 91. Therefore, manhole 91
Generation of foul odor inside is suppressed.

[0008]

In such a pump system, a pair of guide pipes 94 used for installing the submersible pump 95 are provided along the inner peripheral surface of the straight wall portion 91a where the elevating step 93 is provided. Since it cannot be arranged, the upper end of each guide pipe 94 is usually attached to the inner peripheral surface of the opening 92 facing the straight wall 91a. For this reason, each guide pipe 94 is inserted near the axial center of the manhole 91, and the submersible pump 95 lowered along these guide pipes 94 is installed near the central part of the manhole 91.

In order to swirl sewage into each swirling recess 94a of the pre-swirling tank 94 in a swirling state, a storage part 99 is required in the manhole 91 adjacent to each swirling recess 94a for storing a predetermined amount of water. Become. However, in the manhole 91 having the inclined wall portion 91b, the submersible pump 95 is
Since it is arranged only near the central portion of the bottom of the inside, the storage portion 99 for storing the waste water becomes narrow, and there is a possibility that the waste water is not sufficiently swirled in the swirling recess 94a.
In this case, the foreign matter contained in the dirty water does not flow into the turning concave portion 94a but stays in the storage portion 99 of the manhole 91.

The present invention solves such a problem, and an object of the present invention is to provide a sewage pump system which can surely swirl sewage flowing into a manhole and cause the submersible pump to suck the sewage. To do.

[0011]

The sewage pump system of the present invention has a right cylindrical shape having a constant inner diameter from the upper end surface to the bottom surface, and one opening portion is provided in the upper end surface in an eccentric state. The manhole and the inner surface of the manhole at the bottom of the manhole are installed at an appropriate interval, and the pre-rotation tank has a swirl recess into which swirling sewage flows into the manhole while swirling. The waste water storage portion formed between the pre-swirling tank and the inner peripheral surface of the manhole is disposed in the swirl recess so that the lower suction port is located in the swirl recess in the pre-swirl tank, and is sucked. The inner circumference of the opening of the manhole on the far side from the axis of the manhole so that the submersible pump that discharges the dirty water outside the manhole and the submersible pump that is carried in from the opening of the manhole are guided up and down. It is arranged an upper end portion close to, which includes a guide pipe disposed vertically along the manhole inner peripheral surface, the above-described object can be achieved.

[0012]

In the sewage pump system of the present invention, the straight cylindrical manhole whose inner diameter is constant from the upper end surface to the bottom surface is used. Therefore, the elevating step is performed in the manhole close to the inner peripheral surface of this opening. It can be arranged at any position on the inner peripheral surface along the vertical direction. As a result, the guide pipe that raises and lowers the submersible pump can be placed on the far side of the manhole axis in the opening regardless of this raising and lowering step, so that the submersible pump is close to the inner peripheral surface of the manhole. Will be placed. As a result, the storage portion formed between the pre-swirl tank having the swirl recess and the inner peripheral surface of the manhole is widened, and the sewage flowing into the swirl recess from this storage portion is swirled into the sewage reliably.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional view of a sewage pump system of the present invention, and FIG. 2 is a plan view of the pump system.
As shown in FIG. 1, this pump system includes a manhole 10, a pre-swirl tank 20 installed on the bottom of the manhole 10, and a pair of submersible pumps 30.

The manhole 10 has a straight cylindrical shape whose inner diameter is constant at 1500 mm from the upper end surface to the bottom surface.
There is no sloping wall at the top. This manhole 10
On the upper end surface of the, one opening 12 with an inner diameter of 900 mm
However, it is provided so as to be exposed on the surface of the earth. As shown in FIG. 2, the axis P of the opening 12 is eccentric with respect to the axis O of the manhole 10, and a part of the opening 12 overlaps with a part of the inner peripheral surface of the manhole 10. It is in a state.

On the inner peripheral surface of the manhole 10, a plurality of steps 16 for raising and lowering each in a horizontal state are arranged at appropriate intervals in the vertical direction. In the uppermost elevating step 16, one end is supported by the inner peripheral portion of the manhole 10 located below the opening 12, and the other end is located outside the area below the opening 12. Is supported on the inner peripheral surface of the manhole 10.

An inflow pipe 13 for inflowing sewage into the manhole 10 is arranged on the peripheral surface of the manhole 10 opposite to the side where the elevating step 16 is arranged, below the central portion of the manhole 10 in the vertical direction. There is. This inflow pipe 13 is
The manhole 10 is supported in a substantially horizontal state which penetrates the peripheral surface thereof. Further, in the substantially central portion in the vertical direction on the inner peripheral surface of the manhole 10 close to the lifting step 16, 1
A book outflow pipe 14 is attached. This outflow pipe 14
Penetrates the peripheral surface of the manhole 10 in a substantially horizontal state.

The outflow pipe 14 is connected to a pair of discharge pipes 60 (see FIG. 3) mounted vertically along the inner peripheral surface of the manhole 10. The one discharge pipe 60 is arranged along one end located in the lower region of the opening 12 in the elevating step 16, and the discharge pipe 60 is provided.
On the far side of the elevating step 16 with respect to the other discharge pipe 60
Are arranged. Each discharge pipe 60 is, as described later,
Each submersible pump 30 is connected by a pair of discharge pipe connecting fittings 50.

The pre-swirl tank 20 arranged at the bottom of the manhole 10 is slightly shorter than the inner diameter of the manhole 148.
The manhole has a length of 0 mm and is inclined at 70 degrees with respect to a straight line connecting the axis O of the manhole 10 and the axis P of the opening 12 of the manhole 10 at the center of the bottom of the manhole 10. 10 are arranged along the diametrical direction. The pre-turning tank 20 is integrally formed of, for example, fiber reinforced plastic (FRP). The widthwise dimension of the pre-swirl tank 20 is 610 mm,
The inner diameter of the opening in the manhole 10 is sufficiently smaller than 900 mm.

The pre-swirl tank 20 is provided with a pair of hollow swirling concave portions 21 and 21 which are recessed in a line in the longitudinal direction. Overflow weir portions 23 are provided on the sides of the swirl recesses 21 on the side where the inflow pipe 13 is arranged, and are inclined so that the swirl recesses 21 gradually become higher as they move away from the swirl recesses 21. The surface of the overflow weir portion 23 facing the inner peripheral surface of the manhole 10 is in a vertical state. In addition, each of the swirling recesses 21 is formed in the overflow weir portion 23 by penetrating the overflow weir portion 23.
Is provided with an inflow groove 22. Each inflow groove 22
Extend substantially tangentially to each turning recess 21.

A partition wall portion 24 extending in the width direction of the pre-swirl tank 20 is provided between the swirling concave portions 21. The upper surface of the partition wall portion 24 is at the same level as the upper surface of the overflow weir portion 23.

The pre-swirl tank 20 is installed at the bottom of the manhole 10 by embedding the swiveling recesses 21 in concrete 80 cast at the bottom of the manhole 10, and the overflow weir 23 and the inside of the manhole 10 are installed. The upper surface of the cast concrete 80 is exposed in a horizontal state below the upper surface of the overflow weir portion 23 in a bow-shaped region between the peripheral surface and the peripheral surface. And the overflow weir part 23 and the manhole 1
A bow-shaped area between the inner peripheral surface of the inner peripheral surface 0 and the inner peripheral surface of the inner peripheral surface of the inner peripheral surface 0 serves as a storage portion 15 in which dirty water flowing from the inflow pipe 13 into the manhole 10 is stored. Each inflow groove 22 penetrating the overflow weir portion 23 is
The bottom surface of each inflow groove 22 communicates with the storage portion 15, and inclines downward sequentially from the same level as the top surface of the concrete 80, which is the bottom surface of the storage portion 15, toward the turning recess 21 side.

The manhole 1 is provided in each turning recess 21.
Submersible pumps 30 and 30 that are respectively suspended in 0 are arranged. As shown in FIG. 1, each submersible pump 30 has a vertical suction pipe 31 at its lower end, and a suction port 32 at the lower end surface of this suction pipe 31.
However, there is a gap from the bottom surface of each turning recess 21.

The discharge port 33 of each submersible pump 30 extends in an inclined direction with respect to the width direction of the pre-swirl tank 20 so as to approach each discharge pipe 60 from each swirl recess 21 in the pre-swirl tank 20. And they are close to each other. Discharge pipe connecting fittings 50 attached to the lower ends of the discharge pipes 60 are connected to the discharge ports 33, respectively. Each of the discharge pipe connecting fittings 50 has one end connected to the discharge port 33 of the submersible pump 30, extends horizontally from this end, and is curved so that the other end opening faces upward. ing. Then, the lower ends of the discharge pipes 60 through which the dirty water flows are connected to the openings facing upward. Each discharge pipe connecting fitting 50 is provided with leg portions 51 and 51 extending downward at each end portion in the longitudinal direction, and each leg portion 51 is a support base configured separately from the pre-swivel tank 20. It is mounted on 70 and is fixed by, for example, bolts.

Each support base 70 has a rectangular parallelepiped shape framed in a box shape by a frame material made of steel, for example.
Each support base 70 is fixed to the bottom portion of the manhole 10 by an anchor bolt 71, so that the concrete 8
It is embedded in 0. The upper surface of the support base 70 is at the same level as the upper surface of the concrete 80.

The lower ends of the pair of guide pipes 54 and 54 are supported by the respective discharge pipe connecting fittings 50. The lower end of each guide pipe 54 has a discharge pipe connecting fitting 5
At a position close to the submersible pump 30 at 0, the submersible pump 30 is supported by supporting portions arranged on each side portion in the width direction with the horizontal axis of the discharge pipe connecting fitting 50 interposed therebetween. Each of the guide pipes 54 forming a pair has a submersible pump 3
The slide guides 34 attached to 0 are slidably attached, and when the submersible pumps 30 are installed on the bottom portion of the manhole 10, the slide guides 34 are guided by the pair of guide pipes 54, thereby The pump 30 is slid downward.

FIG. 3 is a plan view of the manhole 10.
The guide pipes 54 forming a pair have upper ends of the guide pipes 54 in the opening 12 of the manhole 10 so that the guide pipes 54 are twisted with each other in a state that the guide pipes 54 are twisted at a constant interval in the entire vertical direction. And is supported in a state of being close to the inner peripheral surface of the opening 12. Therefore, the straight line connecting the center lines of the lower ends of the guide pipes 54 and the straight line connecting the center lines of the upper ends intersect with each other. Each of the submersible pumps 30 guided by the pair of guide pipes 54 is in the state where the slide guide 34 is engaged with the upper end of each guide pipe 54.
The submersible pumps 30 are located in the opening 12 of the manhole 10 in a state where they are close to each other.

The slide guide 34 is slid downward along the pair of guide pipes 54 to guide the guide pipes 54.
When reaching the lower end of each of the submersible pumps 30, the submersible pumps 30 rotate about the pair of guide pipes 54 so as to separate from each other, and as shown in FIG.
Located within.

In the sewage pump system of the present invention having such a configuration, when the straight cylindrical manhole 10 is first constructed, the elevating step 16 is attached to the inner peripheral surface of the manhole, and the inflow pipe 13 and the outflow pipe are provided. 14 are attached to the peripheral surface of the manhole 10.

In this state, first, the pre-swirl tank 20
Are carried in through the opening 12 of the manhole 10.
The width of the pre-swirl tank 20 is 610 mm, and the opening 1
Since the inner diameter of the pre-swirl tank 20 is sufficiently smaller than 900 mm, the pre-swirl tank 20 can be easily carried into the manhole 10 with the longitudinal direction thereof being in the vertical state.

Pre-turning tank 2 carried into manhole 10
0 is arranged at a predetermined position on the bottom of the manhole 10 below the inflow pipe 13 so as to form a wide storage portion 15 for storing dirty water. Next, each support base 70 is loaded into the manhole 10 through the opening, and the manhole 10 of the manhole 10 is placed at a predetermined position between the pre-swirl tank 20 and the inner peripheral surface of the manhole 10 in the vicinity of the outflow pipe 14. It is placed at the bottom and fixed by anchor bolts 71. And
The discharge pipe connecting fittings 50 are mounted on the respective support bases 70 and fixed by bolts, and the discharge pipes 6 are attached to the respective discharge pipe connecting fittings 50.
0, and further connect these discharge pipes 60 to the outflow pipe 14
Connect to.

After that, the two sets of guide pipes 54 are carried into the manhole 10, and the lower ends of the pair of guide pipes 54 are connected to the respective discharge pipe connecting fittings 50. Each of the guide pipes 54 is vertically arranged close to the outflow pipe 14 in the opening 12, and has an upper end fixed in the opening 12 in a mutually twisted state.

In this state, concrete 80 is poured on the bottom of the manhole 10. Concrete 80
Are charged around the pre-swirl tank 20 and the respective support bases 70, and have the same level as the bottom surface of each inflow groove 22 and the upper surface of the support base 70 in the swirl tank. As a result, a bow-shaped storage portion 15 is formed between the pre-turning portion 20 and the inner peripheral surface of the manhole 10.

After that, the slide guides 34 provided on the submersible pumps 30 are engaged with the pair of guide pipes 54 and 54, respectively. At this time, each submersible pump 3
As shown in FIG. 3, there is no possibility that 0 will interfere with each other in the opening 12. Then, each slide guide 34
By moving the submersible pumps 30 along the guide pipes 54, the submersible pumps 30 rotate horizontally around the pair of guide pipes 54 and are arranged in the swirling recesses 21 of the pre-swivel tank 20. .

In this way, when each submersible pump 30 is arranged at a predetermined position in the turning concave portion 21, each guide pipe 54 is taken out from the manhole 10, and the discharge port 33 and each discharge pipe of each submersible pump 30 are taken out. One end of the connecting fitting 50 is connected. After that, each guide pipe 54
Were again loaded into the manhole 10, and each submersible pump 3
The slide guide 34 of 0 is engaged. Then, the lower end portion of each guide pipe 54 is supported by a predetermined supporting portion of each discharge pipe connecting fitting 50. The upper end of each guide pipe is fixed to the inner peripheral surface of the opening 12 of the manhole 10.

In the pump system installed in the manhole 10 in this way, when the wastewater flowing from the inflow pipe 13 is stored in the storage portion 15 and reaches the level above the overflow weir portion 24, Each submersible pump 30 is driven. By driving each submersible pump 30, the wastewater stored in each swirling recess 21 is sucked by each submersible pump 30, passes through each discharge pipe connecting fitting 50, and into each discharge pipe 60 and outflow pipe 14. Is flowed.

When the dirty water in each turning concave portion 21 is sucked,
Reservoir 1 between the overflow weir 24 and the inner surface of the manhole 10.
The wastewater stored in 5 flows into each turning recess 21 from each inflow groove 22. Since each inflow groove 22 extends substantially tangentially to each swirl recess 21, the sewage flowing into each swirl recess 21 through each inflow groove 22 becomes a swirl flow. The foreign matter that has flowed into the manhole 10 together with the dirty water surely flows into the swivel concave portions 21 by this swirling flow and is reliably pumped up by the submersible pumps 30. The pumped sewage is sent to the next manhole or sewage treatment plant by natural flow.

In the present invention, the right cylindrical manhole 10 having no slanted wall is used, and the axial center of the manhole 10 on the inner peripheral surface of the opening 12 provided eccentrically with respect to the manhole 10 is used. Since the upper end of each guide pipe 54 is arranged close to the distant side portion, the submersible pump 30 that is lowered along each guide pipe 54.
Are arranged closer to the periphery of the manhole 10. As a result, the pre-swirl tank 20 is arranged in a state of being close to the opening 12 side which is eccentric with respect to the manhole 10,
A wide storage part 15 for storing dirty water is formed between the pre-swirl tank 20 and the inner peripheral surface of the manhole 10. As a result, a swirl flow is reliably formed in each swirl recess 21 through each inflow groove 22, and the filth that has flowed in together with the dirty water in the storage part 15 surely flows into the swirl recess 21. Then, the foreign matter that has flowed into each turning recess 21 is sucked by each submersible pump 30 and discharged to the outside of the manhole 10.

During maintenance and inspection of each submersible pump 30, each submersible pump 30 is pulled up along each pair of guide pipes 54.

[0040]

As described above, in the sewage pump system of the present invention, since the straight cylindrical manhole is used, it is possible to widen the waste water storage portion provided adjacent to the pre-swirl tank. The sewage can be reliably flowed into the swirl recess of the pre-swirl tank while swirling. As a result, the foreign matter contained in the sewage flows into the swirl recess without accumulating in the storage portion, and the foreign matter is reliably discharged to the outside of the manhole by the submersible pump, and the generation of offensive odor in the manhole is suppressed.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a sewage pump system of the present invention.

FIG. 2 is a cross-sectional view of the sewage pump system.

FIG. 3 is a plan view of the sewage pump system.

FIG. 4 is a vertical sectional view of a conventional sewage pump system.

[Explanation of symbols]

 10 Manholes 12 Openings 13 Inflow Pipes 14 Outflow Pipes 15 Reservoir 20 Pre-Swirl Tank 21 Swirling Recesses 22 Inflow Grooves 23 Overflow Weir 24 Partition Walls 30 Submersible Pump 31 Suction Pipe 32 Suction Pipe 50 Discharge Pipe Coupling 54 Guide Pipe 60 Discharge pipe 70 Support stand

Claims (1)

[Claims] 1. A manhole having a straight cylindrical shape with a constant inner diameter from the upper end surface to the bottom surface, and one opening having a diameter smaller than the inner diameter provided in an eccentric state on the upper end surface, and the manhole. It is installed at the bottom of the manhole with an appropriate space from the inner surface of the manhole, and the pre-swirl tank has a swirl recess into which swirling sewage that flows into the manhole swirls and flows into the manhole. The waste water reservoir formed between the inner peripheral surface and the swirl recess of the pre-swivel tank is located in this swirl recess so that the lower suction port is located inside this swirl recess, and the sucked waste water is discharged to the outside of the manhole. So that the submersible pump and the submersible pump loaded from the opening of the manhole are guided and moved up and down, the upper end is arranged close to the inner peripheral surface of the opening of the manhole on the far side from the axis of the manhole. It has been, pump system for sewage which includes a guide pipe disposed vertically along the manhole inner circumferential surface.