JP2005264585A - Manhole device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manhole device constructible to an existing manhole and capable of carrying out maintenance work such as routine cleaning in relatively clean environment and effectively suppressing degradation of a concrete wall and the occurrence of malodor. <P>SOLUTION: A plurality of sealed sanitary sewage storage tanks 4A, 4B which can be carried in from an opening 1A are installed in the manhole 1. The sanitary sewage storage tanks are provided with conduits 3 for leading in sanitary sewage from an inflow pipe 2, and at least one of the sanitary sewage storage tanks is provided with pumps 5A, 5B for feeding sanitary sewage in the tank to an outflow pipe 7. The plurality of sanitary sewage storage tanks are in communication through a communicating pipe 4a, and suction pipes 5a, 5b of the pumps are connected to suck sanitary sewage stored in the sanitary sewage storage tanks while swirling it in the tanks. The communicating pipe 4a communicates in an attitude along the direction of swirling flow of sanitary sewage in the tank. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a manhole apparatus constructed at an appropriate position of a sewage flow piping system connecting a sewage generation source and a sewage treatment plant.

As shown in FIG. 6, a conventional manhole device is formed of fiber reinforced plastic such as FRP at the bottom of a concrete manhole 1 constructed at an appropriate place in a sewage flow pipe system connecting a sewage generation source and a sewage treatment plant. In addition, a retrofitting pre-swivel tank 11 made of a substantially disk-shaped disk-like body is installed, and the suction port 13 of the submersible pumps P1, P2 supported by being suspended is inserted into the pre-swivel parts 13A, 13B. The sewage flowing from the inflow pipe 12 is stored in the manhole 1, and when the sewage water level reaches a predetermined water level, the submersible pumps P1 and P2 are driven and fed to the outflow pipe.
Japanese Patent Laid-Open No. 11-236728

  However, since the conventional manhole device described above uses a concrete manhole as a storage tank and sewage is directly stored in an open air state, in order to prevent deterioration of the concrete wall surface due to sewage and failure of the submersible pump. There is a problem that it is necessary to regularly clean the entire manhole, which increases maintenance costs, and necessitates cleaning work in an unsanitary environment. Moreover, there is a possibility that unpleasant odors are generated by the sewage stored in the tank and pollute the surrounding environment, and there is room for further improvement.

  In view of the above-mentioned conventional drawbacks, the present invention can be constructed even for existing manholes, can perform maintenance work such as periodic cleaning in a relatively clean environment, and also causes deterioration of concrete walls and generation of bad odors. It is in the point which provides the manhole apparatus which can be suppressed effectively.

  In order to achieve the above-described object, the first characteristic configuration of the manhole device according to the present invention is a plurality of sealed sewage storage tanks that can be carried in from the opening as described in claim 1 of the claims. Is installed in the manhole, and the sewage storage tank is provided with a water conduit that guides sewage from the inflow pipe, and at least one of the sewage storage tanks is provided with a pump that supplies the sewage in the tank to the outflow pipe, The plurality of sewage storage tanks communicate with each other through a communication pipe.

  According to the above configuration, the sewage flowing into the manhole from the inflow pipe directly flows into the sealed sewage storage tank via the water conduit, and is pumped from the pump to the outflow pipe without coming into contact with the outside air. There is no direct storage inside the manhole, and it is possible to effectively prevent malodor from leaking from the manhole. As a result, it is possible to prevent deterioration due to the concrete side wall of the manhole coming into contact with sewage, and in such a dried manhole, maintenance of equipment such as a pump can be easily performed in a relatively clean environment. Therefore, workability is greatly improved. In addition, since the sewage storage tank can be carried into the inside through the opening of the manhole, it can be used even with existing manhole devices. By installing a plurality of sewage storage tanks in communication with each other, While securing sufficient storage capacity, the number of pumps pumped to the outflow pipe can be limited. Therefore, the maintenance interval such as cleaning can be extended as a whole, and the running cost and equipment cost can be reduced.

  In the second feature configuration, as described in claim 2 of the same column, in addition to the first feature configuration described above, the suction pipe of the pump causes the sewage stored in the sewage storage tank to swirl within the tank. The communication pipe is connected in a posture along the direction of the swirling flow of the sewage in the tank.

  Since the sewage stored in the sewage storage tank is sucked into the suction pipe outflow pipe of the pump while swirling in the tank, the solid foreign matters floating in the tank are efficiently pumped while swirling by the swirling flow. At this time, since the inner wall of the tank is washed by the swirling flow, it is possible to prevent filth from adhering to the inner wall and solidifying. In addition, since the communication pipe is also communicated in a posture along the direction of the swirling flow of the sewage in the tank, not only the sewage storage tank to which the suction pipe of the pump is connected but also the sewage storage tank communicated by the communication pipe is the same. The effect is obtained.

  In the third feature configuration, in addition to the first or second feature configuration described above, the sewage storage tank is hermetically sealed by an openable / closable lid, as described in claim 3 of the claims. There is in point.

  Since the sewage storage tank is configured to be openable and closable by the lid, it is easy to clean the inside of the tank by removing the lid during maintenance while preventing the generation of bad odor with a sealed structure with the lid attached during operation. It is possible to operate the equipment stably for a long time.

  In the fourth feature configuration, as described in claim 4 of the column of the claims, in addition to any of the first to third feature configurations described above, the sewage storage tank has an opening formed therein. An air vent pipe that is higher than the laying height of the inflow pipe is provided.

  If the sewage storage tank is constructed in a completely sealed structure, the pump load will increase during pumping by the pump and the water supply efficiency will decrease.However, by providing an air vent pipe, efficient pumping will be performed while suppressing an increase in unnecessary pump load. Processing is possible. At this time, by providing the opening of the air vent pipe to be higher than the laying height of the inflow pipe, leakage of sewage to the outside of the tank can be prevented even when the storage tank is full.

  In the fifth feature configuration, in addition to any of the first to fourth feature configurations described above, the pump is an out-of-tank submersible pump, as described in claim 5 of the claims. There is a point.

  By adopting a submersible pump outside the tank as a pump, it is possible to improve the maintainability of the pump installed in the dry pit, but to stably prevent the pump from being damaged by rainwater flowing into the manhole during heavy rainfall. It becomes possible to operate.

  The sixth feature configuration is the sewage storage tank connected by the communication pipe in addition to any of the first to fifth feature configurations described above, as described in claim 6 in the column of the claims. Among them, a filter mechanism for removing solid foreign substances is provided at the connection portion of the upstream sewage storage tank, and a sewage pump is adopted as a pump for feeding the sewage from the sewage storage tank to the outflow pipe, thereby storing the sewage on the downstream side. The pump for feeding water from the tank to the outflow pipe is provided with a fresh water pump.

  Since the sewage from the inflow pipe flows directly into the sewage storage tank on the upstream side, various solid foreign substances are mixed in, but a filter mechanism is provided at the connection part to which the communication pipe with the sewage storage tank on the downstream side is connected. Therefore, the inflow of such foreign matter is prevented in the sewage storage tank on the downstream side. Therefore, it becomes possible to efficiently pump sewage using a pump for fresh water as a water pump from the downstream sewage storage tank to the outflow pipe, that is, a commonly used centrifugal pump. . On the other hand, by using a sewage pump with good solid foreign substance passage performance as a water pump from the upstream sewage storage tank containing foreign substances to the outflow pipe, sewage mixed with solid foreign substances can be reliably pumped. .

  In the seventh feature configuration, in addition to any one of the first to sixth feature configurations described above, the discharge that connects the pump and the outflow pipe is described in claim 7. There exists a valve mechanism in the suction pipe line which connects a pipe line and the said pump and the said sewage storage tank.

  When the operation of the pump is stopped, sewage has accumulated in the discharge pipe connecting the outflow pipe and the discharge port of the pump. In addition, sewage is collected in the sewage storage tank and the suction pipe. If maintenance of the pump or the like is performed in such a state, the sewage accumulated in the discharge pipe, the sewage storage tank, and the suction pipe leaks and not only contaminates the inside of the manhole, but also decreases the workability. Therefore, by providing a valve mechanism in the discharge pipe and the suction pipe, it is possible to reliably prevent leakage of sewage by switching the valve mechanism to a closed state during maintenance.

  As described above, according to the present invention, it is possible to construct an existing manhole, and maintenance work such as periodic cleaning can be performed in a relatively clean environment. A manhole device that can be effectively suppressed can be provided.

  Embodiments of a manhole device according to the present invention will be described below. As shown in FIGS. 1 and 2, the manhole device includes two cylindrical sewage storage tanks 4A and 4B and a pump 5A that pumps sewage in the tanks from the respective sewage storage tanks 4A and 4B. And 5B. The sewage storage tank may be a single unit, or may be divided into several units and assembled in a manhole.

  The sewage storage tanks 4A and 4B are fixedly installed with bolts on a mounting base 1b fixed to the bottom concrete of the manhole 1 by an anchor 1a, and the sewage storage tanks 4A and 4B are connected to each other by a communication pipe 4a. The sewage inflow pipe 2 provided in the sewage is configured to flow into one sewage storage tank 4A through a water conduit 3 provided with a valve mechanism 3A, and the sewage that has entered flows into the other sewage storage through a communication pipe 4a. It flows also into the tank 4B, and it is comprised so that sewage may be stored by both sewage storage tanks 4A and 4B. Each of the above-described sewage storage tanks 4A and 4B has a size that can be carried in from a small-diameter opening 1A for maintenance provided above the manhole 1, so that even an existing manhole 1 can be constructed. The storage capacity of sewage is determined by the number of sewage storage tanks installed.

  The pumps 5A and 5B are also detachably bolted to a mounting base 1d fixed to the bottom concrete of the manhole 1 by an anchor 1c, and the suction pipes 5a and 5b of the pumps 5A and 5B are respectively connected to the sewage storage tanks 4A and 4B. The discharge pipes 5c and 5d are connected to the pressure feed pipe 6 via the valve mechanisms 6A and 6B, and the sewage stored in the sewage storage tanks 4A and 4B is provided from the pressure feed pipe 6 to the side wall of the manhole 1. The sewage outflow pipe 7 is pumped. In addition, a check valve 6c for preventing the backflow of sewage is provided at a connection portion between the pressure feeding pipe 6 and the outflow pipe 7. When the pumps 5A and 5B are maintained, the valve mechanisms 6A and 6B are switched to the closed state, thereby preventing leakage of sewage accumulated in the pressure feeding pipe 6. Further, by switching the valve mechanisms 8A and 8B to the closed state, leakage of sewage stored in the sewage storage tanks 4A and 4B is prevented.

  Each of the sewage storage tanks 4A and 4B is provided with a pressure-type water level sensor (not shown), and when the water level in the tank reaches the water supply start water level HWL, one of the pumps 5A and 5B is driven. It is pumped to the outflow pipe 7 until the water level inside becomes the water supply stop water level LWL. In order to ensure the safety of the apparatus, a float type water level sensor is also installed in addition to the pressure type water level sensor, and when the pressure type water level sensor fails, the drive control of the pump is performed by the float type water level sensor. The pumps 5A and 5B are load-distributed so as to be operated alternately, thereby realizing a long-term safe operation of the pump.

  The pumps 5A and 5B are connected to the suction pipes 5a and 5b so as to be in a posture along the tangential direction of the side wall having a circular cross section so that the stored sewage is sucked into the sewage storage tanks 4A and 4B while swirling in the tanks. The communication pipes 4a of the sewage storage tanks 4A and 4B are also connected so as to have a posture along the direction of the swirl flow formed in the tank, that is, a posture along the tangential direction of the side wall having a circular cross section. In FIG. 2, the swirl flow generated in the storage tanks 4A and 4B when the pump 5B is driven is indicated by a broken line. With this configuration, a swirl flow is formed in the tank when the pump is in operation, solid foreign matters mixed in the sewage are efficiently pumped by the swirl flow, and the inner wall portion of the tank is also cleaned by the swirl flow. Note that the cross-sectional shape of the communication pipe 4a does not need to be circular, and is appropriately configured such as an arch shape or an elliptical shape.

  The sewage storage tanks 4A and 4B are formed in a cylindrical shape with a fiber reinforced resin such as FRP, and the lids 4c and 4d are configured to be openable and closable by a clip mechanism at the top, and the inside of the tank is closed when the lids 4c and 4d are closed. It is maintained in a sealed state that is blocked from outside air. On the other hand, air vent pipes 4e and 4f whose openings are higher than the laying height of the inflow pipe 2 are provided on the upper side walls of the sewage storage tanks 4A and 4B, and the sewage storage tanks 4A and 4B are full. While making it possible to prevent leakage of sewage to the outside of the tank, sewage flow from the inflow pipe 2 to the sewage storage tank is facilitated.

  The above-described pumps 5A and 5B are composed of submersible sewage pumps outside the tank, and the pump installation space is configured as a dry pit to improve the maintainability of the pump, while flowing into the manhole 1 during heavy rainfall. It is configured so that the pump can be prevented from malfunctioning due to rainwater and can be operated stably.

  Hereinafter, another embodiment of the pump device according to the present invention will be described. In the above-described embodiment, the pump 5A, 5B has been described as using an outside tank submersible sewage pump, but is not limited to a submersible pump, and is an example of a centrifugal pump that obtains pressure by centrifugal force due to rotation of an impeller. A land pump such as a vortex pump for sewage may be employed.

  In the above-described embodiment, the pump 5A, 5B has been described using a submersible sewage pump outside the tank, but as shown in FIG. 3, the upstream of the sewage storage tanks 4A, 4B connected by the communication pipe 4a. A filter mechanism 4g for removing solid foreign substances is provided at the connection portion of the sewage storage tank 4A on the side, and a sewage pump is adopted as the pump 5A for feeding the sewage in the sewage storage tank 4A to the outflow pipe 7, thereby storing the sewage on the downstream side The pump 5B that supplies water from the tank 4B to the outflow pipe 7 may be provided with a fresh water pump. In this case, since the inflow of solid foreign matter mixed into the sewage is blocked by the filter mechanism 4g in the downstream sewage storage tank 4B, the fresh water is used as the water feed pump 5B from the downstream sewage storage tank 4B to the outflow pipe 7. Therefore, the sewage can be pumped more efficiently than the sewage pump by using a general-purpose pump, that is, a commonly used centrifugal pump.

  In the above-described embodiment, the two cylindrical sewage storage tanks 4A and 4B are installed in the manhole 1. However, the number of sewage storage tanks to be installed is not limited, and two or more tanks are provided. It is possible to install. For example, as shown in FIG. 4, three sewage storage tanks 4A, 4B, and 4C are installed, and pumps 5A and 5B are connected to the upstream storage tank 4A and the downstream storage tank 4C, respectively. The communication pipes 4a and 4b may be provided between 4A and 4B and the sewage storage tanks 4B and 4C. Also in this case, it is preferable that the communication pipes 4a and 4b are provided in a posture along the direction of the swirling flow formed in the tank when the sewage is pumped.

  In the above-described embodiment, the cylindrical sewage storage tank is described. However, the shape of the sewage storage tank is not limited to this, and for example, as shown in FIG. Shaped sewage storage tanks 4A and 4B may be provided. When using the fan-shaped sewage storage tanks 4A and 4B, by disposing the fan-shaped arc portion along the side wall of the manhole 1 having a circular horizontal section, the useless space in the manhole is eliminated, You can earn sewage storage capacity. Also in this case, it is preferable that the communication pipe 4a is provided in a posture along the direction of the swirl flow formed in the tank when the sewage is pumped.

  The specific structure of the manhole device described in the various embodiments described above can be set as appropriate within the scope of the effects of the present invention, and can be configured by appropriately combining any of the above-described embodiments.

Side view of manhole device Top view of manhole device The top view of the principal part which shows another embodiment The top view of the principal part which shows another embodiment The top view of the principal part which shows another embodiment Side view of a conventional manhole device

Explanation of symbols

1: Manhole 1A: Opening portion 2: Inflow pipe 3: Water guide pipe 3A: Valve mechanism 4A, 4B: Sewage storage tank 4a: Communication pipe 5A, 5B: Pump 6: Pressure feed pipe 6A, 6B: Valve mechanism 7: Outflow pipe 8A 8B: Valve mechanism 11: Pre-swirl tank 12: Inflow pipe 13: Suction port 13A, 13B: Pre-swivel part 14: Outflow pipe

Claims (7)

  A plurality of sealed-type sewage storage tanks that can be carried from the opening are installed in a manhole, and the sewage storage tank is provided with a water conduit that guides sewage from the inflow pipe, and at least one of the sewage storage tanks A manhole device provided with a pump for feeding sewage inside to an outflow pipe, wherein the plurality of sewage storage tanks are connected by a communication pipe.   The suction pipe of the pump is connected so that the sewage stored in the sewage storage tank is sucked while turning in the tank, and the communication pipe is in a posture along the direction of the swirling flow of the sewage in the tank. The manhole apparatus according to claim 1, wherein the manhole apparatus is in communication.   The manhole device according to claim 1 or 2, wherein the sewage storage tank is sealed by a lid that can be freely opened and closed.   The manhole device according to any one of claims 1 to 3, wherein the sewage storage tank is provided with an air vent pipe whose opening is positioned higher than a laying height of the inflow pipe.   The manhole device according to any one of claims 1 to 4, wherein the pump is a submersible pump outside the tank.   Among the sewage storage tanks connected by the communication pipe, a filter mechanism for removing solid foreign substances is provided at the connection part of the upstream sewage storage tank and the sewage in the sewage storage tank is supplied to the pump for sewage The manhole device according to any one of claims 1 to 5, wherein a pump is used, and a pump for fresh water is provided in a pump that supplies water from a downstream sewage storage tank to the outflow pipe.   The manhole device according to any one of claims 1 to 6, wherein a valve mechanism is provided in a discharge pipe connecting the pump and the outflow pipe and a suction pipe connecting the pump and the sewage storage tank.

Images