JP2883258B2 - Sewage pump system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage pump system for once pumping sewage in the middle of a sewage pipe so that the sewage flows naturally in the sewage pipe.

[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 manholes are arranged in the middle of the sewer pipe, and a pump system for pumping sewage is installed in each manhole. The sewage pumped by each pump system is again fed by gravity.

[0003] As a pump system disposed in a manhole, a pump system has been developed in which sewage flowing into the manhole is swirled and pumped by a submersible pump. In this pump system, a pre-swirl tank provided with a pair of swirling recesses into which sewage flows while swirling is provided at the bottom of the manhole. The sewage in each swivel recess in the pre-swirler is pumped up by each submersible pump arranged in each swivel recess and discharged to a discharge pipe arranged vertically along the inner wall of the manhole. The submersible pump is suspended in the manhole so that the suction port is immersed in each swivel recess in the pre-swirl tank, and the submersible pump and the discharge pipe laid in the manhole are connected by a discharge pipe connection fitting. Are linked. The discharge pipe connection fitting is supported by a support base provided adjacent to the swivel recess in the pre-swirler.

[0004] In such a pump system, since the sewage flows into the swirl recess as a swirling flow, there is no danger that foreign matter mixed in the sewage will accumulate at the bottom of the manhole. Generation of offensive odor in the manhole is suppressed.

[0005]

However, in order for the sewage to flow into each of the swirling recesses in the pre-swirling tank as a swirling flow, an area where the wastewater is stored adjacent to each of the swirling recesses. Will be needed. For this reason, the discharge pipe into which the sewage discharged from the submersible pump flows needs to be disposed in the manhole in a region on the opposite side of the region where the sewage is stored.

Normally, manholes are standardized, and the inside diameter of the opening exposed on the ground is smaller than the maximum inside diameter of the manhole. For example, when the maximum inner diameter of the manhole is 1500 mm, the inner diameter of the opening is 900 mm.
mm. The length of the pre-swirl tank having a pair of swivel recesses is approximately equal to the inner diameter of the manhole, 1500 mm
It is about. In addition, since the pre-swirl tank is provided with a support portion for a discharge pipe connection fitting for connecting the submersible pump and the discharge pipe, the width of the pre-swirl tank is also 1500 mm.
The pre-swirl tank cannot be carried into the manhole through an opening having an inner diameter of 900 mm.

[0007] In order to carry the pre-swirl tank into the manhole, the pre-swirl tank having the support base for the discharge pipe connecting metal fittings must first be provided with the bottom of the manhole formed when the manhole is constructed. It is carried into the bottom of the manhole and thereafter form the top of the manhole with an opening. However, in this case, it is necessary to temporarily suspend the construction of the manhole and install the pre-swirling tank. Usually, the manhole is constructed by a civil engineer, while the installation of the pre-swirling tank is performed by a submersible pump manufacturer. Therefore, it is necessary to coordinate work arrangements between the respective companies. In particular, since the machines and the like required by each contractor are different, once the machines and the like used by the civil engineer are once carried out, the machines for installation of the pre-swirl tank and the like are brought into the site, and the pre-swirl tank is installed. At the end of the operation, the machine for installing the pre-swirling tank must be carried out, and then the civil engineering machine must be carried back to the site, which requires a lot of work.

On the other hand, once the manhole is completed, the upper part provided with the opening of the manhole is removed, the pre-rotation tank is carried into the manhole, and then the upper part of the manhole is attached. I have. However, also in this case, there is a problem that the work of removing and attaching the upper part of the manhole is troublesome.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a sewage pump system capable of installing a pre-swirling tank at a predetermined position in a manhole after the manhole is completed. It is in.

[0010]

SUMMARY OF THE INVENTION A sewage pump system according to the present invention is a sewage pump system for pumping sewage flowing into a manhole, wherein the sewage flowing into the manhole swirls and flows into the manhole. A pre-swirl tank sized to be carried into the manhole through the opening of the manhole and installed at the bottom of the manhole, and a lower suction port in a swivel recess in the pre-swirl tank. A submersible pump arranged in the swivel recess so as to be positioned, a discharge pipe connecting fitting for connecting a discharge port of the submersible pump and a discharge pipe arranged along the inner peripheral surface of the manhole, and an opening of the manhole The pre-swirl tank is configured so as to be separated from the pre-swirl tank so that the discharge pipe connection fitting is supported at the bottom of the transferred manhole. A support base which is installed, which comprises a, the object is achieved.

[0011]

In the sewage pump system according to the present invention, the discharge pipe connecting fitting for connecting the discharge port of the submersible pump and the discharge pipe arranged along the inner peripheral surface of the manhole includes a support base provided at the bottom of the manhole. Supported by The support table is configured separately from the pre-swirl tank having the swivel recess, and the support table and the pre-swirl tank are carried into the manhole from the manhole openings. Then, the support carried into the manhole is installed at a predetermined position on the bottom of the manhole, and the discharge pipe connecting fitting is supported on the support. A submersible pump is disposed in the swivel recess of the pre-swirler, and the submersible pump is connected to the discharge pipe connection fitting.

[0012]

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, FIG. 2 is an enlarged view of a main part thereof, and FIG. 3 is a plan view of the pump system. This pump system is shown in FIG.
As shown in the figure, it is installed at the bottom of the manhole 10.

The manhole 10 has an inner diameter of 1500 m.
The manhole 10 is provided with an opening 12 having an inner diameter of 900 mm at the upper end surface thereof so as to be exposed to the ground. An inflow pipe 13 (see FIG. 2) through which sewage flows into the manhole 10 is supported in the middle of the peripheral surface of the manhole 10 in the vertical direction. An outflow pipe 14 is attached to a portion of the manhole 10 opposite to the peripheral surface to which the inflow pipe 13 is attached. The outflow pipe 14 has a pair of discharge pipes 60 (FIG. 3) attached vertically along the inner peripheral surface of the manhole 10.
Reference). Each of the discharge pipes 60 is connected to the submersible pump 30 via a discharge pipe connection fitting 50 as described later.

As shown in FIG. 2, the pump system of the present invention has a pre-swirling tank 20 disposed at the bottom of the manhole. This pre-swirling tank 20 extends long along the diametrical direction at the center of the manhole 10, for example,
It is integrally formed of fiber reinforced plastic (FRP). The longitudinal dimension of the pre-swirling tank 20 is slightly shorter than the inner diameter of the manhole 10 and is 1480 mm.

As shown in FIG. 3, a pair of cylindrical recesses 21 and 21 are provided on each side of the pre-swirler 20 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.
In addition, the overflow weir 23 is provided with an inflow groove 22 that penetrates the overflow weir 23 and communicates with each swivel recess 21. Each inflow groove 22 extends substantially tangentially to each swivel recess 21.

A partition 24 extending in the width direction is provided between the turning recesses 21. The upper surface of the partition 24 is at the same level as the upper surface of the overflow weir 23.
Further, a shielding plate 27 extending to the opposite side to the overflow weir 23 is detachably attached to the partition 24.
The shielding plate 27 is moved past the overflow weir 23 and is turned into
1 is prevented from flowing into the other swivel recess 21 due to swirling flow in one swivel recess 21, and the swirling of the wastewater in each swivel recess 21 is strengthened. In a state where the shielding plate 27 is separated from the pre-rotation tank 20,
The manhole 10 passes through the opening 12 of the manhole 10.
It is sized to be carried inside.

The pre-swirl tub 20 is installed at the bottom of the manhole 10 with each swivel recess 21 embedded in concrete 80 cast at the bottom of the manhole 10. The upper surface of the concrete 80 constructed in the bow-shaped region between the overflow weir 23 and the inner peripheral surface of the manhole 10
Is horizontal below the upper surface of the overflow weir 23 so as to form a storage portion 15 for storing sewage flowing into the manhole 10 from above.

As shown in FIG. 2, submersible pumps 30 and 30 respectively suspended in the manhole 10 are arranged inside each swivel recess 21. 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, they are arranged with a gap from the bottom surface of each swivel recess 21.

The discharge port 33 of each submersible pump 30 extends in a direction away from the overflow weir section 23 than each of the swivel recesses 21 in the pre-swirling tank 20, and the discharge port 33 is provided with a discharge pipe connecting fitting. 50 are connected to each other. 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 of the legs 51 is provided on a support base 70 separate from the pre-rotation tank 20.
It is mounted on top and fixed, for example, by bolts.

Each support base 70 is separated from the pre-rotation tank 20 and is formed in a box shape by, for example, a steel frame material to have a rectangular parallelepiped shape. Therefore, the width dimension of the pre-swirling tank 20 is about 610 mm, which is sufficiently smaller than the inner diameter of the opening of the manhole 10 at 900 mm.

Each support 70 is fixed to the bottom of the manhole 10 by an anchor bolt 71, respectively.
Embedded in concrete 80. The discharge pipe connection fitting 50 is fixed on the support base 70 by, for example, a bolt. The upper surface of the support 70 is made of concrete 8
0 is equal to the upper surface.

The lower end portions 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 the position close to the submersible pump 30 at 0, it is supported by supports arranged on each side in the width direction across the horizontal axis. A slide guide 34 attached to one of the submersible pumps 30 is slidably attached to each of the paired guide pipes 54. When the submersible pump 30 is installed on the bottom of the manhole 10, the respective sub-pumps 30 The slide guide is guided by the pair of guide pipes 54, and the submersible pump slides downward.

The pump system having such a configuration is installed in the manhole 10 after the manhole 10 is manufactured. First, the pre-swirling tank 20 is a manhole 1
0 is carried in through the opening 12. The width of the pre-swirling tank 20 is 610 mm, and the inner diameter of the opening is 900 mm.
Since it is sufficiently smaller than that, the longitudinal direction of the pre-swirling tank 20 can be carried into the manhole 10 in a vertical state.

The pre-swirling tank 2 carried into the manhole 10
0 is arranged at a predetermined position on the bottom of the manhole 10. Next, each support base 70 is carried into the manhole 10 through the opening, is arranged at the bottom of the manhole 10 so as to be at a predetermined position with respect to the pre-swirling tank 20, and is fixed by the anchor bolt 71. Then, the discharge pipe connecting fittings 50 are mounted on each support base 70 and fixed with bolts, each discharge pipe 60 is connected to each discharge pipe connecting fitting 50, and one discharge pipe 14 is connected to these discharge pipes 60. Attach. After that, the lower end of the guide pipe 54 is connected to each discharge pipe connecting fitting 50. The upper end of each guide pipe 54 is fixed to the inner peripheral surface of the manhole 10.

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. Thereby, the storage part 15 of a bow shape is formed.

Next, the shielding plate 27 is carried into the manhole 10 through the opening 12 of the manhole 10, and the shielding plate 27 is bolted to the partition wall 24 of the pre-rotation tank 20.

Thereafter, the slide guides 34 and 34 provided on each submersible pump 30 are engaged with the pair of guide pipes 54 and 54, and each slide guide 34 is lowered along the guide pipe 54, whereby A submersible pump 30 is arranged in each swivel recess 21 in the pre-swirler 20.

When the submersible pumps 30 are disposed in the swivel recesses 21 in this manner, the guide pipes 54 are taken out of the manhole 10 and the discharge ports 33 of the submersible pumps 30 and the discharge pipe connecting fittings 50 are provided. Is connected to one end. After that, each guide pipe 54 is carried into the manhole 10 again, and is brought into the engagement state with the slide guide 34 of each submersible pump 30. 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 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 section 15 and reaches the level above the overflow weir section 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. Thus, the foreign matter that has flowed into the manhole 10 together with the sewage surely flows into each of the swirl recesses 21 by the swirl flow.
Zero ensures pumping. The pumped sewage is sent by gravity to the next manhole or sewage treatment plant.

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

[0033]

As described above, in the sewage pump system of the present invention, the pre-swirl tank provided with the pair of swivel recesses and the discharge pipe connecting fitting connected to the submersible pump disposed in each swivel recess are provided. Since the support table and the support stand are separated from each other, it is possible to carry each of them through the opening of the manhole. Therefore, the sewage pump system of the present invention can be installed after the manhole is completed,
The workability of installing the pump system and manufacturing the manhole is significantly improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a sewage pump system of the present invention.

FIG. 2 is an enlarged view of a main part of the sewage pump system.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Manhole 12 Opening 13 Inflow pipe 14 Outflow pipe 20 Pre-swirling tank 21 Swirling recess 22 Inflow groove 23 Overflow weir 24 Partition wall 30 Submersible pump 31 Suction pipe 32 Suction port 50 Discharge pipe connection fitting 60 Discharge pipe 70 Support base

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E03F 5/22

Claims (2)

(57) [Claims] A sewage pump system for pumping sewage flowing into a manhole, the sewage pumping system having a swirl concave portion into which the sewage flowing into the manhole flows while flowing, and having a diameter smaller than the inner diameter of the manhole. A pre-swirl tank sized to be carried into the manhole through the opening of the manhole and installed at the bottom of the manhole; and a swivel recess such that a lower suction port is located in the swivel recess in the pre-swirl tank. A submersible pump disposed in the submersible pump, a discharge pipe connecting fitting for connecting a discharge port of the submersible pump, and a discharge pipe disposed along the inner peripheral surface of the manhole, and carried into the manhole through the opening of the manhole. And a support which is installed so as to support the discharge pipe connection fitting at the bottom of the manhole carried in. Sewage pump system comprising the, the. 2. The pre-swirl tank has a pair of swivel recesses,
Each submersible pump is arranged in each turning recess,
Between each of the swivel recesses of the pre-swirling tank, a shield plate extending to the side opposite to the inflow side of the sewage into each of the swivel recesses is attached. The sewage pump system according to claim 1, wherein the sewage pump system is carried into a manhole through the water.