JP2995252B2 - Sewage pump system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for temporarily removing sewage in the middle of a sewage pipe so that the sewage flows naturally in the sewage pipe.
The present invention relates to a pumping system for sewage pumping.

[0002]

2. Description of the Related Art When sending sewage to a sewage treatment plant,
Natural flow is economical. However, when the sewage pipe extends over a long distance, sewage is supplied to a deep place in the ground at the sewage treatment plant only by gravity. For this purpose, usually several pump systems are arranged in the middle of the sewer line. Each pump system has a manhole into which sewage flows, and a submersible pump for pumping the sewage flowing into the manhole. The sewage pumped by each pump system is again fed by gravity.

In recent years, a pump system has been developed in which, when pumping sewage flowing into a manhole by a submersible pump, the sewage is swirled by a pre-swirl tank. 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.
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 axis of the manhole 91. Opening 9
In the upper part of the manhole 91 below the second part 2, one side part is a straight wall part 91a in a vertical state, while the other side part facing the straight wall part 91a is inclined. It has become the inclined wall part 91b.

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

[0005] At the bottom of the manhole 91, a pre-swirling tank 94 is provided.
Is installed. The pre-swirl tank 94 has a pair of cylindrical swivel recesses 94a into which the sewage flows while swirling, and the sewage in each swivel recess 94a is provided in each of the submersible pumps disposed in the respective swivel recess 94a. The water is pumped up by 95 and discharged to a discharge pipe 96 arranged vertically along the inner peripheral surface of the manhole 91. The submersible pump 95 is suspended in the manhole 91 such that the suction port is immersed in each swivel recess 94 a in the pre-swirler 94, and the submersible pump 95 and the discharge pipe 96 piped in the manhole 91 are connected to the submerged pump 95. Are connected by a discharge pipe connection fitting 97.

[0006] A submersible pump 95 disposed in a pre-swirling tank 94 provided at the bottom of the manhole 91 is provided with a manhole 9.
It is carried in from one opening 92 provided on one upper end surface. When carrying the submersible pump 95 into the manhole,
Normally, as disclosed in Japanese Utility Model Publication No. 63-49600, a pair of guide pipes 98 arranged in a mutually twisted state is inserted and fixed from the opening 92, and A method of lowering the submersible pump 95 along is adopted.

In such a pump system, since the sewage flows in the swirling concave portion 94a as a swirling flow, there is no possibility that foreign matter mixed in the sewage will accumulate on the bottom of the manhole 91. Therefore, manhole 91
The generation of offensive odors is suppressed.

[0008]

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

In order to make the sewage flow into each swivel recess 94a of the pre-swirler 94 in a swirling state, a storage portion 99 for storing a predetermined amount of water is required in the manhole 91 adjacent to each swivel recess 94a. Become. However, in the manhole 91 having the inclined wall portion 91b, the submersible pump 95
Since it is arranged only near the central portion at the bottom of the inside, the storage portion 99 in which the sewage is stored becomes narrow, and the sewage may not be sufficiently swirled in the swivel recess 94a.
In this case, the foreign matter contained in the sewage does not flow into the swivel recess 94a but stays in the storage 99 of the manhole 91.

The present invention is to solve such a problem, and an object of the present invention is to provide a sewage pump system capable of surely imparting a swirl to sewage flowing into a manhole and sucking the sewage by a submersible pump. Is to do.

[0011]

The sewage pump system of the present invention has a straight cylindrical shape having a constant inner diameter from the upper end surface to the bottom surface, and has an eccentric upper end surface having a diameter smaller than the inner diameter. A manhole provided with one opening, and a manhole inner peripheral surface is provided at an appropriate interval at the bottom of the manhole, and a pair of sewage flowing into the manhole flows into the inside while turning . A pre-swirl tank having a swivel recess, a storage portion for sewage formed between the pre-swirl tank and the inner peripheral surface of the manhole,
As the lower suction port of the respective pivot in the recess is positioned, is arranged in the bottom of the manhole, it is carried a sucked sewage and a pair of submersible pump for discharging respectively out of a manhole, through the opening of the manhole each submersible pump to raise and lower respectively that, in the manhole inner circumferential surface
The upper ends are arranged close to each other along the vertical direction, and the upper ends are arranged close to the inner peripheral surface of the opening of the manhole far from the axis of the manhole.
As each medium pump is lowered,
Of the manhole near the shaft center
Guide each submersible pump away from each other
And a pair of guide pipes, which achieves the above object.

[0012]

In the sewage pump system of the present invention, a straight cylindrical manhole having a constant inner diameter from the upper end surface to the bottom surface is used. It can be arranged at any position on the inner peripheral surface along the up-down direction. As a result, since the guide pipe for raising and lowering the submersible pump can be arranged on the far side of the manhole axis in the opening independently of this raising and lowering step, the submersible pump is close to the inner peripheral surface of the manhole. Be placed. Thereby, the storage part formed between the pre-swirl tank having the swivel recess and the inner peripheral surface of the manhole is widened, and the sewage flowing from the storage part into the swirl recess is swirled into the sewage without fail.

[0013]

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

FIG. 1 is a longitudinal 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, the pump system includes a manhole 10, a pre-swirling tank 20 installed at the bottom of the manhole 10, and a pair of submersible pumps 30.

The manhole 10 has a straight cylindrical shape with a constant inner diameter of 1500 mm from the upper end surface to the bottom surface.
There is no slope wall at the top. This manhole 10
At the upper end face of the opening, one opening 12 having an inner diameter of 900 mm is provided.
Is provided so as to be exposed on the ground surface. 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 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 vertically moving steps 16, each of which is in a horizontal state, are arranged at appropriate intervals in the vertical direction. In the uppermost lifting 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. Supported on the inner peripheral surface of the manhole 10.

On the peripheral surface of the manhole 10 opposite to the side where the elevating step 16 is disposed, an inflow pipe 13 through which sewage flows into the manhole 10 is disposed below a vertically central portion of the manhole 10. I have. This inflow pipe 13
It is supported in a substantially horizontal state penetrating the peripheral surface of the manhole 10. Also, in the center of the inner peripheral surface of the manhole 10 close to the elevating step 16 in the vertical direction, 1
An 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) which are mounted vertically along the inner peripheral surface of the manhole 10. One discharge pipe 60 is disposed along one end located in a region below the opening 12 in the elevating step 16.
The other discharge pipe 60 is located on the far side of
Is arranged. Each discharge pipe 60 is, as described later,
The pair of discharge pipe connection fittings 50 are connected to the submersible pumps 30 respectively.

The pre-swirling tank 20 arranged at the bottom of the manhole 10 has a length 148 slightly shorter than the inner diameter of the manhole 10.
The manhole 10 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 diametric direction. The pre-swirling tank 20 is integrally formed of, for example, fiber reinforced plastic (FRP). The width dimension of the pre-swirling tank 20 is 610 mm,
The inside 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 cylindrical swivel recesses 21 and 21 which are recessed and arranged in the longitudinal direction. An overflow weir 23 is provided on the side of each swivel recess 21 on the side where the inflow pipe 13 is arranged, and is inclined upward so as to become farther away from each swivel recess 21. The surface of the overflow weir 23 facing the inner peripheral surface of the manhole 10 is in a vertical state. Each of the swirl recesses 21 penetrates the overflow weir 23 through the overflow weir 23.
Is provided with an inflow groove 22 communicating with the inflow groove. Each inflow groove 22
Extend substantially in a tangential direction of each swivel recess 21.

A partition 24 extending in the width direction of the pre-swirl tank 20 is provided between the respective swivel recesses 21. The upper surface of the partition 24 is at the same level as the upper surface of the overflow weir 23.

The pre-swirl tank 20 is installed at the bottom of the manhole 10 by embedding the respective swivel recesses 21 in concrete 80 cast at the bottom of the manhole 10. The upper surface of the cast concrete 80 is exposed below the upper surface of the overflow weir 23 in a horizontal state below the upper surface of the overflow weir 23 in the bow-shaped region between the peripheral surface and the peripheral surface. And the overflow weir 23 and the manhole 1
The arc-shaped region between the inner surface of the manhole 10 and the inner peripheral surface of the manhole 10 serves as a storage part 15 for storing sewage flowing into the manhole 10 from the inflow pipe 13. Each inflow groove 22 penetrating the overflow weir 23 is
The bottom surface of each inflow groove 22 is sequentially inclined downward from the same level as the upper surface of the concrete 80 which is the bottom surface of the storage portion 15 toward each turning recess 21 side.

The manhole 1 is provided inside each swivel recess 21.
The submersible pumps 30 and 30 respectively suspended in 0 are arranged. As shown in FIG. 1, each submersible pump 30 has a vertical suction pipe 31 at the lower end, and a suction port 32 at the lower end surface of the suction pipe 31.
However, it is in a state where a gap is provided with 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-swirling tank 20 so as to approach each discharge pipe 60 from each swivel recess 21 in the pre-swirling tank 20. Are close to each other. Discharge pipe connection fittings 50 attached to the lower ends of the discharge pipes 60 are connected to the discharge ports 33, respectively. Each discharge pipe connection fitting 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. The lower ends of the discharge pipes 60 through which the sewage flows are connected to the openings facing upward. Each of the discharge pipe connecting fittings 50 is provided with legs 51 and 51 extending downward at each end in the longitudinal direction, and each leg 51 is provided separately from the pre-rotation tank 20. 70, and is fixed by, for example, bolts.

Each support 70 is box-shaped by, for example, a steel frame material and has a rectangular parallelepiped shape.
Each support 70 is fixed to the bottom of the manhole 10 by an anchor bolt 71, respectively, and concrete 8
Embedded within 0. The upper surface of the support 70 is at the same level as the upper surface of the concrete 80.

The lower ends of the pair of guide pipes 54 are supported by the respective discharge pipe connecting fittings 50. The lower end of each guide pipe 54 is connected to the discharge pipe connection fitting 5.
At a position close to the submersible pump 30 at 0, the discharge pipe connection fitting 50 is supported by support portions arranged on each side in the width direction across the horizontal axis. Each submersible pump 3 is fitted to each pair of guide pipes 54.
The slide guides 34 attached to the underwater pumps 30 are slidably attached to each other. When each of the submersible pumps 30 is installed at the bottom of the manhole 10, the slide guides 34 are guided by a pair of guide pipes 54 so that the The pump 30 is slid downward.

FIG. 3 is a plan view of the manhole 10.
The upper ends of the guide pipes 54 are placed in the openings 12 of the manholes 10 so that the guide pipes 54 are twisted with each other in a state in which the guide pipes 54 forming a pair are spaced apart from each other in the vertical direction. Thus, the opening 12 is supported in a state close to the inner peripheral surface thereof. Therefore, a straight line connecting the center lines of the lower ends of the guide pipes 54 and a straight line connecting the center lines of the upper ends of the guide pipes 54 cross each other. Each of the submersible pumps 30 guided by each pair of guide pipes 54 has a configuration in which 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 so that the guide pipe 54
When the submersible pumps 30 reach the lower ends of the swivel recesses 21 in the pre-swirl tub 20, as shown in FIG.
Is 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 is attached to the peripheral surface of the manhole 10.

In such a state, first, the pre-swirling tank 20
Is carried in through the opening 12 of the manhole 10.
The width of the pre-swirling tank 20 is 610 mm, and the opening 1
2 is sufficiently smaller than 900 mm in inner diameter, so that the longitudinal direction of the pre-swirling tank 20 can be set in a vertical state and can be easily carried into the manhole 10.

The pre-rotation tank 2 carried into the manhole 10
0 is disposed at a predetermined position on the bottom of the manhole 10 below the inflow pipe 13 so as to form a wide storage section 15 for storing sewage. Next, each support table 70 is carried into the manhole 10 through the opening, and the manhole 10 is moved to a predetermined position close to the outflow pipe 14 between the pre-swirling tank 20 and the inner peripheral surface of the manhole 10. It is arranged at the bottom and fixed by anchor bolts 71. And
The discharge pipe connecting fittings 50 are mounted on each support base 70 and fixed by bolts.
0 and further connect these discharge pipes 60 to the outflow pipes 14.
Connect to

Thereafter, the two guide pipes 54 are carried into the manhole 10, and the lower end portions of the pair of guide pipes 54 are connected to the respective discharge pipe connecting fittings 50. The guide pipes 54 are vertically arranged close to the outflow pipe 14 in the opening 12, and the upper ends thereof are fixed in the opening 12 in a mutually twisted state.

In this state, concrete 80 is cast on the bottom of the manhole 10. Concrete 80
Is thrown around the pre-swirl tub 20 and the support pedestals 70 to have the same level as the bottom surface of each inflow groove 22 and the upper surface of the support stool 70 in the swirl tub. As a result, a bow-shaped storage section 15 is formed between the pre-rotation section 20 and the inner peripheral surface of the manhole 10.

Thereafter, the slide guides 34 provided on each submersible pump 30 are engaged with the pair of guide pipes 54 and 54, respectively. At this time, each submersible pump 3
0 indicates that there is no risk of interference in the opening 12 as shown in FIG. Then, each slide guide 34
Is lowered along the guide pipes 54 so that the submersible pumps 30 rotate in the horizontal direction about the paired guide pipes 54 and are arranged in the respective swivel recesses 21 in the pre-swirler 20. .

As described above, when each submersible pump 30 is disposed at a predetermined position in the swivel recess 21, each guide pipe 54 is taken out from the manhole 10, and the discharge port 33 of each submersible pump 30 and each discharge pipe One end of the connection fitting 50 is connected. After that, each guide pipe 54
Is again carried into the manhole 10 and each submersible pump 3
0 slide guide 34 is engaged. Then, the lower end of each guide pipe 54 is supported by a predetermined support 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 manner, when the sewage flowing from the inflow pipe 13 is stored in the storage unit 15 and further reaches the level above the overflow weir 24, Each submersible pump 30 is driven. By driving each of the submersible pumps 30, the contaminated water stored in the respective swivel recesses 21 is sucked by the respective submersible pumps 30 and passes through the respective discharge pipe connection fittings 50 into the respective discharge pipes 60 and the outflow pipes 14. Is passed.

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

In the present invention, a manhole 10 having a straight cylindrical shape without a slope wall is used, and the center of the manhole 10 at the inner peripheral surface of the opening 12 provided eccentrically to the manhole 10 is used. Since the upper end of each guide pipe 54 is arranged close to the distant portion, the submersible pump 30 lowered along each guide pipe 54
Are arranged from the central part of the manhole 10 to the peripheral part. As a result, the pre-swirling tank 20 is disposed in a state of being shifted toward the opening 12 side eccentric with respect to the manhole 10,
A wide storage portion 15 for storing sewage is formed between the pre-swirling tank 20 and the inner peripheral surface of the manhole 10. As a result, the swirl flow is reliably formed in each swirl recess 21 through each inflow groove 22, and the dirt that has flowed in along with the wastewater in the storage unit 15 reliably flows into the swirl recess 21. The foreign matter that has flowed into each swivel recess 21 is sucked by each submersible pump 30 and discharged out of the manhole 10.

For maintenance and inspection of the submersible pumps 30, the submersible pumps 30 are pulled up along the guide pipes 54 forming a pair.

[0040]

As described above, in the sewage pump system of the present invention, the use of the straight cylindrical manhole allows the wastewater storage portion provided adjacent to the pre-swirling tank to be widened. Thus, the sewage can surely flow into the swivel recess of the pre-swirler while swirling. As a result, the foreign matter contained in the sewage flows into the swirl concave portion without staying in the storage part, and the foreign matter is surely discharged to the outside of the manhole by the submersible pump, thereby suppressing the generation of an odor in the manhole.

[Brief description of the drawings]

FIG. 1 is a longitudinal 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 longitudinal sectional view of a conventional sewage pump system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Manhole 12 Opening 13 Inflow pipe 14 Outflow pipe 15 Reservoir 20 Pre-rotation tank 21 Revolution recess 22 Inflow groove 23 Overflow weir part 24 Partition part 30 Submersible pump 31 Suction pipe 32 Suction port 50 Discharge pipe connection fitting 54 Guide pipe 60 Discharge tube 70 support base

Continuation of the front page (56) References JP-A-3-84136 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E03F 7/00

Claims (1)

(57) [Claims] 1. A manhole having a straight cylindrical shape having a constant inner diameter from an upper end surface to a bottom surface, and having an eccentrically provided opening in the upper end surface with a diameter smaller than the inner diameter; A pre-swirl tank having a pair of swirl recesses which are disposed at an appropriate distance from the inner peripheral surface of the manhole at the bottom of the manhole, and in which sewage flowing into the manhole swirls and flows into the manhole; And a storage section for the sewage formed between the inner peripheral surface of the manhole and the lower suction port located in the lower part of the manhole so that the lower suction port is located in each swivel recess in the pre-swirler. a pair of submersible pump the sewage discharged respectively to the outside of the manhole has a respective water pump which is carried in from the opening of the manhole it
Move up and down as close as possible
Are arranged along the downward direction, adjacent to the opening inner peripheral surface of the manhole in the axial center distal manhole its
With the upper end portion is disposed in Re respectively, each submerged pump
Man at each submersible pump as each is lowered
Parts located near the axis of the hole are separated from each other
And a pair of guide pipes adapted to guide the respective submersible pumps .