JPH07207744A - Sewage pump well - Google Patents

Abstract

PURPOSE:To prevent a foreign material such as dust and sediment from being accumulated on the bottom of a sewage pump well by placing a cylindrical manhole body on an invert having a coated layer on the surface via the flame spray of resin having high slidable function, and closing the lower end of the manhole body with the invert in watertight state. CONSTITUTION:A cylindrical concrete manhole body 1 is placed on a concrete invert 2 in such state as having only the upper opening 1A thereof exposed above the ground. The lower end of the body 1 is thereby closed with the invert 2 in watertight state, and a sewage inlet pipe 3 is connected thereto through the peripheral wall. Furthermore, the delivery pipe 10A of a manhole pump 10 is connected to the body 1. In this case, the manhole pump 10 is installed with an intake pipe 10B inserted in a sump 2A recessed in the invert 2. A pumping pipe 5 extended upward is connected to the outlet of a delivery bent pipe 4, thereby forming a delivery system. Resin having high slidable function such as ethylene tetrafluoride resin is flame sprayed directly to the surface of the concrete invert 2, thereby forming a coated layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage pump well in which a sewage pump such as a manhole pump is installed at the bottom of a manhole main body, and relates to a technique for preventing foreign matters such as dust from accumulating on the bottom. .

[0002]

2. Description of the Related Art As a conventional sewage pump well, for example, as shown in FIG. 7, an invert (bottom portion) is formed with only an upper opening 1A of a cylindrical manhole body 1 exposed to the ground.
2, the lower end of the manhole main body 1 is watertightly closed by the invert 2, and the sewage inflow pipe 3 is connected through the peripheral wall of the manhole main body 1 to connect the invert. Discharge curved pipe 4 installed on the upper surface of the central part of 2, and this discharge curved pipe 4
Pipe connected to the outlet of the pumping pipe 5, the check valve 6 connected to the upper end of the pumping pipe 5, the header pipe 7 connected to the outlet of the check valve 6, and the peripheral wall of the manhole body 1. A discharge system 9 is formed by a drainage pipe 8 and the like penetrating through the header pipe 7 and the discharge pipe 10A of the manhole pump 10 can be attached to and detached from the most upstream portion of the discharge system 9, that is, the discharge curved pipe 4. A structure is known in which the manhole pump 10 is installed on the upper portion of the invert 2 with the suction pipe 10B of the manhole pump 10 inserted into the cauldron 2A recessed in the invert 2 while being connected. ing.

In this type of sewage pump well, a foreign substance 11 such as dust or earth and sand mixed in the sewage and flowing from the sewage inflow pipe 3.
May adhere to and accumulate on the upper surface of the invert 2 over time.

As described above, the accumulation of the foreign matter 11 such as dust and earth and sand causes various harmful effects. Therefore, conventionally, a vacuum car or a high-pressure washing vehicle is regularly mounted horizontally on the manhole main body 1, and an operator descends from the upper opening 1A into the manhole main body 1 and the upper surface of the invert 2 is closed. The work of removing the foreign matter 11 accumulated on the surface is performed. That is, it is necessary to perform complicated work in an extremely bad environment.

[0005]

The problem to be solved is that when foreign matter such as dust or earth and sand deposits on the upper surface of the bottom, an operator descends inside the sewage pump well and accumulates in an extremely poor environment. That is, a complicated work for removing the foreign matter is required.

[0006]

According to a first aspect of the present invention, there is provided a sewage pump well in which a suction pipe is inserted into a cauldron recessed in a bottom portion to install a sewage pump, and at least the inner surface of the sewage pump well is provided. A coating layer having excellent slipperiness is formed on the surface of the bottom, and the object of preventing foreign matters such as dust and earth and sand from accumulating on the bottom is achieved. According to the invention of claim 2, in a sewage pump well having a sewage pump installed by inserting a suction pipe into a cauldron recessed in the bottom portion, at least the inner surface of the sewage pump well has excellent slipperiness. A coating layer having characteristics is formed, and a discharge water injection system that injects a part of the discharge water into the discharge system of the sewage pump is formed in a branched manner, and the injection port of this discharge water injection system is directed to the coating layer. In addition, a control valve is provided in the discharge water injection system to prevent foreign matters such as dust and earth and sand from accumulating on the bottom, and even if foreign matter adheres to or accumulates on the bottom, The purpose of forcibly removing the foreign matter by operating the control valve from outside the manhole main body was achieved.

[0007]

According to the first aspect of the present invention, since the coating layer having excellent slipperiness is formed on at least the bottom surface of the inner surface of the sewage pump well, foreign matter to be attached to the coating layer is treated as sewage. It can be easily moved toward the kettle by the flow of dirty water in the pump well.
The foreign matter that has moved to the kettle can be discharged together with the wastewater by the wastewater pump. According to the invention of claim 2, since the coating layer having excellent slipperiness is formed on at least the bottom surface of the inner surface of the sewage pump well,
The foreign matter attached to the coating layer can be easily moved toward the kettle by the flow of the sewage in the sewage pump well. The foreign matter that has moved to the kettle can be discharged together with the wastewater by the wastewater pump. On the other hand, even if foreign matter adheres to the coating layer and accumulates over time, by opening the control valve provided in the discharge water injection system, the discharge water discharged from the discharge pipe of the wastewater pump to the discharge system can be opened. A part of the water is jetted from the jet port of the jet system toward the coating layer. That is, a part of the discharge water is jetted at high pressure from the jet port of the jetting system of jetting water toward the foreign matter attached to or deposited on the coating layer. As a result, the foreign matter is forcibly sent to the bottom shuttle by the jet of water, and is sucked into the wastewater pump together with the wastewater and discharged.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional front view showing an embodiment of the present invention, FIG. 2 is a vertical sectional side view, and FIG. 3 is a sectional view taken along the line AA of FIG. The description will be given with the same reference numerals. 1 to 3, the sewage pump well is placed on the concrete invert 2 with only the upper opening 1A of the tubular concrete manhole body 1 exposed on the ground surface. The lower end of the main body 1 of the manhole is watertightly closed by the invert 2, and the sewage inflow pipe 3 is connected through the peripheral wall of the main body 1 of the manhole to discharge it to the upper surface of the central portion of the invert 2. The bend pipe 4 is installed, and the discharge pipe 1 of the manhole pump 10 is attached to the discharge bend pipe 4.
0A is detachably connected and the suction pipe 10B of the manhole pump 10 is recessed in the invert 2 to form a cauldron 2A.
The manhole pump 10 is installed on the upper part of the invert 2 in a state of being inserted in the. A pumping pipe 5 extending upward is connected to the outlet of the discharge curved pipe 4, and an upper end of the pumping pipe 5 is connected to a discharge header pipe 7 via a check valve 6, and the discharge header pipe 7 is connected to a manhole. It has a structure in which a drain pipe 8 is connected through the peripheral wall of the main body portion 1, and a discharge system 9 is constituted by the discharge curved pipe 4, the pumping pipe 5, the check valve 6, the header pipe 7 and the drain pipe 8. ing.

The surface of the concrete invert 2 is coated with a coating layer 12 having excellent slipperiness.
Are formed. The coating layer 12 is made of a resin 12A having excellent slipperiness such as tetrafluoroethylene resin,
As shown in FIG. 4, means for directly spraying and forming the surface of the invert 2, or as shown in FIG. 5, the surface of the substrate 12B made of a steel plate or a resin plate is coated with the resin 12A having excellent slipperiness. Make a composite member 12C
This composite member 12C is embedded in the surface of the invert 2 and is formed by means of fixing it to the surface of the invert 2 by using an adhesive 12D or a plurality of fixing screws 12E as shown in FIG.

On the other hand, a discharge water injection system 13 for injecting a part of the discharge water into the discharge header pipe 7 is branched. The discharge water injection system 13 is provided with a branch pipe 13A branched from the discharge header pipe 7, and an annular pipe 13B and an annular pipe 13B connected to the outlet of the branch pipe 13A and installed near the invert 2. Of a plurality of injection nozzles 13C, 1 attached at a pitch of 8 and directed to the coating layer 12
3C ..., and a control valve 14 formed of, for example, an electric valve is provided in the branch pipe 13A. The control valve 14 is normally kept in a closed state, opened by a valve opening signal from a controller 15 installed outside the sewage pump well, and closed by a closing signal. In addition,
16 is a float type water level gauge.

With such a configuration, in the sewage pump well, the foreign matter 1 such as dust or earth and sand mixed in the sewage 1
1 is a coating layer 12 having excellent slipperiness
Even if it does not adhere to the foreign matter 11, the foreign matter 11 slides on the surface of the coating layer 12 toward the kettle 2A by the flow of the waste water in the well pump well, that is, the waste water flow generated by the operation of the manhole pump 10, and reaches the kettle 2A. Will be dropped. Therefore, the foreign matter 1 dropped in the shuttle 2A
Since 1 can be discharged to the outside of the sewage pump well together with the sewage by the manhole pump 10, it is not necessary to remove the foreign matter 11 under a bad environment as in the conventional case.

On the other hand, when the manhole pump 10 is operated to lower the water level near the invert 2, the controller 15 outputs a valve open signal to the control valve 14 to open the control valve 14. , Part of the discharge water discharged from the discharge pipe 10A of the manhole pump 10 to the discharge header pipe 7 of the discharge system 9 flows from the branch pipe 13A to the annular pipe 13B,
A plurality of injection nozzles 13 attached to the annular pipe 13B
High-pressure water is jetted from C, 13C ... To the upper surface of the invert 2, that is, the surface of the coating layer 12. Therefore, even if foreign matter adheres to or accumulates on the coating layer 12, these foreign matter 11 is forcibly sent to the kettle 2A by the high-pressure jet water flow,
It can be discharged together with the sewage by the manhole pump 10.

In the above-described embodiment, the coating layer 12 having excellent slipperiness is formed only on the surface of the invert 2. However, the coating layer 12 of the invert 2 is described. It may be formed on the inner surface of the manhole main body 1 together with the surface. With this configuration, it is possible to prevent the foreign matter 11 from adhering to the inner surface of the manhole main body 1. Further, although an automatic valve such as an electric valve is adopted as the control valve 14 in the description, the control valve 14
May be an automatic valve such as a solenoid valve, or may be a manual valve and the opening / closing handle of the manual valve may be opened / closed by an operating rod. Further, the discharge water injection system 13 is branched from the discharge header pipe 7, and the discharge water injection system 13 is branched from any one selected from the discharge curved pipe 4, the pumping pipe 5, and the drain pipe 8. May be. Further, the work of removing the foreign matter 11 using the discharge water jet system 13 is not limited to the above-described mode in which the foreign matter 11 is deposited on the upper surface of the invert 2, and is periodically performed in a relatively short cycle. High-pressure water may be jetted from the jet nozzles 13C, 13C ....

[0014]

As described above, according to the present invention, even if foreign matter such as dust and earth and sand does not adhere to the coating layer having excellent slipperiness in the well of the wastewater pump well, the foreign matter remains in the well of the wastewater pump well. The flow of sewage, that is, the sewage flow generated by the operation of the sewage pump, slides on the surface of the coating layer toward the basin and is dropped into the basin. It can be discharged together with the sewage out of the sewage pump well. In addition, even if foreign matter adheres to or accumulates on the coating layer, these foreign matter are forcibly sent to the cauldron by the high-pressure jet water flow jetted from the jet port of the jet water jet system toward the coating layer. It can be discharged together with the sewage by the sewage pump. Therefore, it is possible to omit the cumbersome foreign matter removing operation which was performed under the bad environment.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional side view showing an embodiment of the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is an enlarged sectional view partially showing an example of a coating layer forming means.

FIG. 5 is an enlarged sectional view partially showing another example of the coating layer forming means.

FIG. 6 is an enlarged sectional view partially showing still another example of the coating layer forming means.

FIG. 7 is a vertical sectional view of a conventional example.

[Explanation of symbols]

 1 Manhole Main Body 2 Invert (Bottom) 2A Kamaba 9 Discharge System 10 Manhole Pump (Sewage Pump) 10B Sewage Pump Suction Pipe 12 Coating Layer 13 Discharged Water Injection System 13C Injection Nozzle (Discharged Water Injection System Injector ) 14 Control valve

Claims (2)

[Claims] 1. A sewage pump well having a sewage pump installed by inserting a suction pipe into a cauldron recessed in the bottom, and at least the inner surface of the sewage pump well is provided with excellent slipperiness. A sewage pump well having a coating layer formed thereon. 2. A sewage pump well having a sewage pump installed by inserting a suction pipe into a cauldron recessed at the bottom, and at least the inner surface of the sewage pump well is provided with excellent slipperiness. A coating layer having is formed, a discharge water injection system for injecting a part of the discharge water into the discharge system of the sewage pump is formed in a branched manner, and the injection port of the discharge water injection system is directed to the coating layer, A sewage pump well characterized in that a control valve is installed in the discharge water injection system.