JP2014001502A - Manhole, sewage drawing unit, and sewage heat utilization system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewage heat utilization system which can be installed and operated at low cost.SOLUTION: A gutter-shaped body 11 is provided with a screen 12 which allows sewage to flow down between an upstream side sewage line 1d and a downstream side sewage line 1b and has a plurality of linear clearances 13 its bottom. A clog prevention mechanism 21 is comprised of rakes 22 and a moving mechanism 23. The rake 22 is inserted into each of the clearances 13 of the screen 12 from the lower side of the screen 12. The moving mechanism 23 moves the rakes 22 along the clearances 13 of the screen 12 into which the rakes 22 are inserted. The moving mechanism 23 is driven by driving means 31. A catchment guide part 41 comprising a bottom of a manhole 1a or a catchment guide container 51 installed on the bottom of the manhole 1a receives the sewage falling down through the screen 12, and guides the fallen sewage through the gutter-shaped body 11 to introduce it to a sewage drawing path 2 connected to a side wall of the manhole 1a.

Description

  The present invention relates to a heat utilization system that utilizes sewage heat, and more particularly, to a sewage heat utilization system that takes in sewage with less impurities in a manhole, and a manhole and sewage extraction unit that are suitable for the system.

  In recent years, air conditioning using a heat pump has been put into practical use and widely used, and sewage heat has attracted attention as its heat source. Sewage heat has a feature that the temperature change throughout the year is smaller than the temperature change of the atmosphere, and it can be said that it is a very promising heat source especially in urban areas where the sewage pipeline system is developed.

  As a system that uses sewage heat, for example, a sewage heat utilization system that draws sewage from a sewage pipe and collects heat or the like and then returns the sewage to the sewage pipe has been put into practical use overseas. FIG. 8 shows a schematic configuration diagram of a sewage heat utilization system in practical use in Germany. In addition, since the said sewage heat utilization system is not a literature well-known invention, there is no prior art document which should be described.

  As shown in FIG. 8, this sewage heat utilization system 100 includes a sewage extraction pipe 102 for drawing sewage from a sewage pipe 101, a pit 103 for accumulating sewage, a heat exchanger 104 for exchanging heat using sewage, A sewage return pipe 105 is provided for returning the heat-exchanged sewage to the sewage pipe line 101. A screen device 111 is disposed at the end of the sewage outlet pipe 102 on the pit 103 side. The contaminants (solid matter etc.) in the sewage drawn through the sewage extraction pipe 102 are separated in the screen device 111, and the sewage from which the contaminants have been removed is introduced into the pit 103. The sewage in the pit 103 is pulled up by the pump 107 and introduced into the heat exchanger 104 through the heat medium supply pipe 106. The sewage that has passed through the heat exchanger 104 is returned to the sewage pipe 101 through the sewage return pipe 105. The sewage return pipe 105 is connected to the sewage pipe 101, and the sewage that has passed through the heat exchanger 104 naturally flows down in the sewage return pipe 105 and reaches the sewage pipe 101. In FIG. 8, a sewage extraction pipe 102 is connected to the bottom of a manhole 101a provided in the sewage pipe 101, and a sewage return pipe 105 is connected to the top of the manhole 101a. The sewage flow is flowing in a direction perpendicular to the paper surface (for example, from the front to the back). Moreover, the sewage pipe 101b shown in FIG. 8 is an open end of the sewage pipe on the back side exposed to the manhole 101a.

  The sewage heat utilization system 100 also includes a contaminant transport unit 121 for returning the contaminants separated from the sewage in the screen device 111 to the sewage pipeline 101. The contaminant transport unit 121 includes a contaminant holding unit 122 and an elevating mechanism 123 that moves the contaminant holding unit 122 across the screen device 111 and the sewage return pipe 105. In this conventional example, a contaminant inlet 105 c into which contaminants are carried by the contaminant transport unit 121 is provided in the middle of the sewage return pipe 105. Hereinafter, the sewage return pipe 105 upstream from the contaminant carry-in port 105c is referred to as an upstream sewage return pipe 105a, and the sewage return pipe 105 downstream from the contaminant carry-in port 105c is referred to as a downstream sewage return pipe 105b.

  In the sewage heat utilization system 100 described above, the contaminants separated from the sewage in the screen device 111 are carried into the contaminant holding unit 122 located at a position adjacent to the screen device 111 by a transfer device (not shown). The foreign matter holding part 122 into which the foreign matter has been carried moves to the sewage return pipe 105 by the lifting mechanism 123. The foreign matter holding part 122 that has reached the sewage return pipe 105, for example, injects the foreign matters into the foreign substance inlet 105c of the sewage return pipe 105 by inverting the top and bottom. The foreign substance thrown into the foreign substance carrying-in port 105c is conveyed to the sewage pipe line 101 through the downstream sewage return pipe 105b together with the sewage flowing through the heat exchanger 104 and flowing in the upstream sewage return pipe 105a. .

  On the other hand, as a technique related to the present invention, there is known a screen device that is installed in a water channel such as a sewage treatment plant and that separates impurities from sewage (for example, Patent Documents 1 to 4). Patent Document 1 discloses a dust removing device that eliminates clogging of a screen by driving a rake (claw) disposed in each gap of a screen by horizontally driving a motor by converting a rotary motion into a horizontal motion by a link mechanism. . Patent Document 2 discloses a horizontal bar screen device that eliminates clogging of a screen by fixing a plurality of rakes to an endless chain and sequentially passing a plurality of rakes driven by the chain turning drive. Yes. Patent Document 3 discloses a solid-liquid separation device with a screen that rotates a disk disposed in each gap of the screen around a rotation axis different from the center of the disk to eliminate clogging of the screen. Patent Document 4 discloses a dust collecting device that eliminates clogging of a screen by sequentially passing a plurality of rakes that move circularly around a rotation axis through each gap of the screen.

  As another related technique, a technique for diverting sewage exceeding the design flow rate of the sewage pipe is known in order to reduce the load on the sewage pipe (for example, Patent Documents 5 to 6). Patent Document 5 provides a partition plate that divides the cross section of the existing sewage pipe in the vertical direction, and forcibly changes the flow of the sewage flowing down the partition plate in a lateral direction by a partition chamber provided on the partition plate. A water splitting unit for water splitting is disclosed. Further, Patent Document 6 discloses that a plurality of rectangular openings, which are connection ports with a diversion channel, are separated from each other in the flow direction and shifted in the width direction of the water channel on the bottom wall of the water channel. Disclosed is a quantitative water-dispersing device provided in an orthogonal state.

JP 2006-299755 A JP 2005-036423 A JP 59-109210 A JP-A-11-324101 JP 2002-317487 A JP 7-317110 A

  In the prior art shown in FIG. 8, a contaminant transport unit 121, which is a mechanism for separating and separating the contaminants from the sewage drawn from the sewage pipeline 101 and returning them to the sewage pipeline 101 for continuous operation. It is essential to provide For this reason, it is necessary to secure a space for installing the foreign matter transport unit 121 and to provide a corresponding cost for installing the foreign matter transport unit 121.

  For example, if a screen device is installed at the end of the sewage drain pipe 102 on the side of the sewage pipe 101 and sewage containing no contaminants can be drawn from the sewage pipe 101, a contaminant such as the contaminant transport unit 121 can be removed. There is no need to provide a mechanism for returning to the sewer pipe 101. However, it is not preferable to dispose a structure that obstructs the flow of sewage in the sewage pipeline because it directly leads to a decrease in the function of the sewage pipeline. In this point of view, in the conventional screen devices as disclosed in Patent Documents 1 to 4 described above, since a relatively large structure is installed in the sewage flow path, the flow of sewage is not obstructed. End up.

  On the other hand, according to the water diversion method as disclosed in Patent Documents 5 and 6 described above, it is possible to draw sewage flowing beyond a predetermined height from the bottom of the sewage pipe without obstructing the flow of sewage. . Since the sewage drawn by such a technique is a supernatant part, it can be said that the amount of impurities is relatively small. However, in such a water diversion method, sewage does not flow into the diversion channel when the sewage flow rate in the sewage pipe is small. That is, since sewage cannot be drawn out at a stable flow rate, it cannot be said to be a suitable method as a sewage drawing method for using sewage heat.

  The present invention has been made in view of the problems of the prior art as described above. A manhole and an existing manhole that can draw out sewage containing no contaminants at a stable flow rate without inhibiting the flow of sewage. The purpose is to provide a sewage drawer unit that can be easily applied to a new manhole. It is another object of the present invention to provide a low-cost sewage heat utilization system that does not require a mechanism for returning the removed contaminants to the sewage pipeline by using the manhole or the sewage extraction unit.

  In order to achieve the above object, the present invention employs the following technical means. That is, the present invention is a manhole to which a sewage extraction path for drawing sewage for heat utilization is connected, and includes a bowl-shaped body, a clogging prevention mechanism, a driving means, and a water collection guide. The rod-shaped body includes a screen having a plurality of gaps at the bottom while allowing sewage to flow between the upstream sewage pipe and the downstream sewage pipe. This gap is preferably arranged along the flow of the sewer stream of the rod-shaped body. The clogging prevention mechanism includes a rake and a moving mechanism. The rake is inserted into each gap of the screen from the lower side of the screen. The moving mechanism moves the rake along the gap between the screens in which the rake is inserted. The moving mechanism is driven by driving means. The water collection guide receives the sewage that has fallen through the screen, guides the sewage that has fallen, and introduces the sewage into the sewage extraction path connected to the side wall of the manhole.

  This manhole has a structure for drawing sewage from the bottom of the sewage flow path, and there is no need to arrange a structure in the sewage flow path. Moreover, since the screen is flush with the bottom of the rod-shaped body that is the sewage flow path, the sewage containing no contaminants can be drawn out at a stable flow rate without hindering the flow of sewage.

  In this manhole, the water collection guide can be formed integrally with the bottom of the manhole. In this case, each of the rod-shaped body, the clogging prevention mechanism, and the driving means is constituted by one or a plurality of members having a size that can be carried into an inspection port provided in the manhole. It is possible to adopt a configuration in which the drive means is assembled and installed on the water collection guide portion inside the manhole. This configuration facilitates installation. Especially for existing manholes, the existing invert is removed and the shape-processed manhole bottom is assembled and installed with a rod-shaped body, a clogging prevention mechanism and a driving means, so it can be installed very easily. it can.

  On the other hand, in another aspect, the present invention can also provide a sewage extraction unit installed in a manhole to which a sewage extraction path for extracting sewage for heat utilization is connected. That is, the sewage extraction unit according to the present invention includes a bowl-shaped body, a clogging prevention mechanism, a driving means, and a water collection guide container. The rod-shaped body includes a screen having a plurality of gaps at the bottom while allowing sewage to flow between the upstream sewage pipe and the downstream sewage pipe. This gap is preferably arranged along the flow of the sewer stream of the rod-shaped body. The clogging prevention mechanism includes a rake and a moving mechanism. The rake is inserted into each gap of the screen from the lower side of the screen. The moving mechanism moves the rake along the gap between the screens in which the rake is inserted. The moving mechanism is driven by driving means. The water collection guide container is installed at the bottom of the manhole, receives the sewage falling through the screen, guides the sewage that has fallen, and introduces the sewage into the sewage outlet connected to the side wall of the manhole.

  This sewage extraction unit has a structure for drawing sewage from the bottom of the sewage flow path, and there is no need to arrange a structure in the sewage flow path. Moreover, since the screen is flush with the bottom of the rod-shaped body that is the sewage flow path, the sewage containing no contaminants can be drawn out at a stable flow rate without hindering the flow of sewage.

  In this sewage drawing unit, each of the bowl-shaped body, the clogging prevention mechanism, the driving means, and the water collection guide container is constituted by one or a plurality of members having a size that can be carried into the inside from an inspection port provided in the manhole. It is possible to adopt a configuration in which the state body, the clogging prevention mechanism, the driving means, and the water collection guide container are assembled and installed on the bottom of the manhole. This configuration facilitates installation. Especially for existing manholes, the water collection guide container, bowl, clogging prevention mechanism and drive means are assembled and installed at the bottom of the manhole from which the existing invert has been removed. Can do.

  In another aspect, the present invention can provide a sewage heat utilization system including the manhole described above or a manhole including the sewage extraction unit described above. That is, the sewage heat utilization system according to the present invention is provided in the sewage pipeline, and connected to a sewage draw-out passage that draws sewage from the sewage pipeline, and introduces sewage into the sewage draw-out passage, or the manhole described above. A manhole having a sewage extraction unit, a heat exchange part for exchanging heat with the sewage drawn by the sewage extraction pipe, and a discharge path for discharging the sewage heat exchanged in the heat exchange part into the sewage pipe line.

  In this sewage heat utilization system, sewage containing no contaminants can be drawn out from the sewage pipe, so that a conventional mechanism for returning the contaminants into the sewage pipe becomes unnecessary. In addition, since this sewage heat utilization system does not hinder the flow of sewage in the sewage pipe, it can be applied to existing sewage pipes without causing any problems. As a result, a sewage heat utilization system can be provided at low cost.

  According to the present invention, it is possible to realize a sewage heat utilization system in which the installation cost is significantly reduced as compared with the conventional one.

The schematic block diagram which shows the whole structure of the sewage heat utilization system in one Embodiment of this invention Schematic which shows the sewage extraction structure with which the manhole in one Embodiment of this invention is equipped The top view which shows the sewage extraction structure with which the manhole in one Embodiment of this invention is equipped The cross-sectional view which shows the sewage extraction structure with which the manhole in one Embodiment of this invention is equipped The longitudinal cross-sectional view which shows the sewage extraction structure with which the manhole in one Embodiment of this invention is provided Schematic which shows the water collection guide container installed in the manhole in one Embodiment of this invention. Schematic which shows the water collection guide container installed in the manhole in one Embodiment of this invention. Schematic configuration diagram showing the overall configuration of a conventional sewage heat utilization system

  Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. Hereinafter, the present invention is embodied as a sewage heat utilization system that draws sewage laterally with respect to a sewage flow and uses it as a heat source in a manhole provided in a sewage pipe. In the following, a sewage pipe constituted by a sewage pipe is illustrated.

  FIG. 1 is a schematic configuration diagram showing an overall configuration of a sewage heat utilization system 10 in the present embodiment. As shown in FIG. 1, this sewage heat utilization system 10 includes a sewage extraction path 2, a heat exchange unit 4, and a sewage return path 5 (discharge path), and draws sewage from a manhole 1 a provided in the sewage pipe line 1. To use as a heat source. In addition, FIG. 1 has shown the cross section perpendicular | vertical with respect to a sewage flow, and the sewage pipe 1b shown in the figure is an open end of the back sewage pipe exposed to the manhole 1a. In this example, the sewage flows from the manhole 1a toward the back sewage pipe 1b (that is, from the front of the paper to the back).

  The sewage extraction channel 2 is a pipeline that draws sewage from the sewage pipeline 1 and is connected to a manhole 1 a provided in the sewage pipeline 1. The connecting position of the sewage extraction path 2 in the manhole 1a is near the bottom of the side wall of the manhole 1a located in a direction perpendicular to the sewage flow direction in the sewage pipe 1. The sewage extraction path 2 is installed in a state where the sewage naturally flows down from the manhole 1a side to the other end side in the sewage extraction path 2.

  The manhole 1 a includes a sewage extraction structure 60 including a bowl-shaped body 11, a clogging prevention mechanism 21, a motor (driving means) 31, and a water collection guide portion 41. The bowl-shaped body 11 constitutes a sewage flow path for allowing sewage to flow between the upstream sewage pipe and the downstream sewage pipe. A screen 12 having a plurality of gaps along the sewage flow flowing through the bowl 11 is disposed at the bottom of the bowl 11. The clogging prevention mechanism 21 includes a rake 22 and a moving mechanism 23. The rake 22 is inserted into each gap of the screen 12 from the lower side of the screen 12. The moving mechanism 23 moves the rake 22 along the gap of the screen 12 in which the rake 22 is inserted. The motor 31 moves the rake 22 along the gap of the screen 12 by driving the moving mechanism 23. The water collection guide 41 receives the sewage that has fallen through the screen 12 and guides the sewage that has fallen into the sewage extraction path 2. In the present embodiment, the water collection guide 41 is configured to guide the sewage that has fallen through the screen 12 in a direction that intersects with the sewage flow that flows through the bowl 11. Details of the sewage extraction structure 60 will be described later.

  The sewage led out by the sewage extraction path 2 is used as a heat medium in the heat exchanging unit 4 including a heat exchanger. In the sewage heat utilization system 10, sewage drawn from the sewage draw-out path 2 is temporarily accumulated in the pit 3, and the sewage accumulated in the pit 3 is introduced into the heat exchange unit 4. In this example, the heat exchange unit 4 is installed on the ground, but the installation position of the heat exchange unit 4 is not particularly limited. Moreover, the heat exchanger of the heat exchange part 4 should just be the structure which utilizes sewage as a heat medium. Any known system can be adopted for the heat exchanger.

  As shown in FIG. 1, the pit 3 has a bottom 3c provided at a position lower than the bottom 1c of the manhole 1a. The other end of the sewage extraction path 2 is connected to the side wall of the pit 3 that is a predetermined height above the bottom 3c. The pit 3 is provided with a pump 7 for sending sewage accumulated in the pit 3 to the heat exchange unit 4. The pump 7 and the heat exchange unit 4 are connected by a heat medium supply pipe 6, and sewage transported through the heat medium supply pipe 6 is introduced into the heat exchanger of the heat exchange unit 4 as a heat medium.

  The sewage provided for heat exchange in the heat exchange unit 4 is discharged to the sewage pipe line 1 through the sewage return path 5. The sewage return path 5 is a pipe that discharges the sewage that has passed through the heat exchanging section 4 to the sewage pipe 1, and in this embodiment, the sewage return path 5 is connected to the manhole 1 a. The sewage that has passed through the heat exchange unit 4 naturally flows down in the sewage return path 5 and reaches the sewage pipe 1. Although not particularly limited, in this example, a part of the sewage return path 5 is disposed inside the pit 3, and between the pit 3 and the manhole 1 a, along the sewage extraction path 2 above the sewage extraction path 2. A sewage return passage 5 is provided.

  Further, the end of the sewage return passage 5 on the manhole 1a side extends downstream from the downstream end of the screen 12. For example, in the vicinity of the downstream sewage pipe 1b or in the downstream sewage pipe 1b. An open end of the sewage return channel 5 is arranged. With this configuration, the sewage returned to the sewage pipe line 1 through the sewage return path 5 after use of heat is prevented from flowing again into the sewage extraction path 2 through the screen 12. As a configuration for preventing such re-inflow, for example, sewage discharged from the sewage return path 5 collides with the open end of the sewage return path 5 on the manhole 1 a side, and the sewage is bounced back to the downstream side of the screen 12. A configuration in which a baffle plate is provided can also be employed.

  In this sewage heat utilization system 10, sewage with less impurities can be drawn out from the sewage pipe 1. This eliminates the need for a mechanism for returning the contaminants to the sewer line, such as the contaminant transport unit 121 in the prior art. Therefore, the space for installing the foreign material transport unit 121 and the cost for installing the foreign material transport unit 121 become unnecessary.

  Then, the structure of the sewage extraction structure 60 with which the manhole 1a is provided is demonstrated. FIG. 2 is a transparent perspective view showing a schematic configuration of the sewage extraction structure 60. FIG. 3 is a plan view showing a schematic configuration of the sewage extraction structure 60. 4 is a cross-sectional view (transverse cross-sectional view) along the line AA shown in FIG. 5 is a cross-sectional view (longitudinal cross-sectional view) taken along line BB shown in FIG. Although not particularly limited, in the present embodiment, the manhole 1a is a well-known assembly-type manhole (Japanese Sewerage Association Standard A-11). 2-5, only the part of the pipe mounting wall 73 arrange | positioned at the bottom plate 72 installed on the crushed stone foundation 71 is shown in figure, and illustration of the straight wall and the slant wall installed on the said pipe mounting wall 73 is shown. Is omitted. Moreover, in FIG. 2, illustration of the crushed stone foundation and the bottom plate is also omitted.

  As shown in FIGS. 2 to 5, the pipe mounting wall 73 of the manhole 1 a has a circular cross-sectional shape in plan view, and an upstream sewage pipe 1 d, a downstream sewage pipe 1 b, and a sewage extraction path are formed on the side walls. 2 is connected. In this example, the upstream sewage pipe 1 d and the downstream sewage pipe 1 b are provided on the opposing wall surfaces of the pipe mounting wall 73. As shown in FIG. 5, the upstream sewage pipe 1 d and the downstream sewage pipe 1 b are inserted into through holes provided in the pipe mounting wall 73, and joints are provided between the sewage pipes 1 b and 1 d and the pipe mounting wall 73. 74 is interposed. The sewage outlet 2 is connected to the side wall of the pipe mounting wall 73 in a direction orthogonal to the sewage flow down direction of the sewage pipe 1 (the direction from the upstream sewage pipe 1d to the downstream sewage pipe 1b) near the bottom of the manhole 1a. Has been. Here, as shown in FIG. 4, the lowest position of the inner peripheral surface of the sewage extraction path 2 at the open end 2a of the sewage extraction path 2 exposed on the side wall of the manhole 1a (hereinafter referred to as the sewage extraction outlet 2a) is It is flush with the end of the lower portion 77 on the upper surface of the manhole bottom 1c on the sewage outlet 2a side. In FIG. 5, the sewage outlet 2a is indicated by a dotted line for reference. The manhole bottom 1c is configured as an upper surface of the concrete 75 placed on the bottom plate 72.

  As shown in FIGS. 2, 3, and 5, a bowl-shaped body 11 having a U-shaped cross section is provided between the upstream sewage pipe 1 d and the downstream sewage pipe 1 b. The end of the upstream side sewer pipe 1d has an inner surface that is aligned with the inner surface of the substantially lower half of the upstream side sewer pipe 1d, and the end of the downstream sewer pipe 1b side is downstream. It has an inner surface aligned with the inner surface of the substantially lower half of the side sewer pipe 1b. In the present embodiment, as shown in FIGS. 2 to 5, a stepped portion 76 that protrudes upward from the above-described lower portion 77 is formed at the end of the manhole bottom 1 c on the upstream sewage pipe 1 d and downstream sewage pipe 1 b side. Is provided, and the bowl-shaped body 11 is installed on the stepped portion 76. As will be described later, the stepped portion 76 has a function of guiding the sewage dropped from the bowl-like body 11 to the sewage extraction path 2. In this example, the stepped portion 76 is along a direction orthogonal to the sewage flow downward direction in plan view. It has an arcuate shape with strings. In addition, the bowl-shaped body 11 can be comprised with metals, such as stainless steel, and resin, for example.

  The bowl-shaped body 11 includes a screen 12 at the bottom. As shown in FIGS. 3 to 5, the screen 12 includes a plurality of gaps 13 along the sewage flow that flows down the bowl 11. As the sewage passes through the gap 13, impurities are separated from the sewage. Further, the separated impurities are caused to flow downstream of the rod-like body 11 by the action of the sewage flow that flows through the rod-like body 11 and the action of the movement of the rake 22 described later.

  Although not particularly limited, in the present embodiment, the screen 12 has a structure in which a plurality of rod-shaped bodies 14 made of stainless steel having a rectangular cross section are arranged in the horizontal direction at intervals of about several tens of millimeters. Each rod-like body 14 is disposed in parallel with the sewage flow flowing through the bowl-like body 11 in a horizontal direction, and is integrally supported by flat plate-like connecting members 15 at both ends in the longitudinal direction, so that it has a rectangular shape in plan view. A screen 12 is configured. In FIG. 3, a portion indicated by a thick line corresponds to the gap 13.

  A clogging prevention mechanism 21 is disposed below the screen 12. As described above, the clogging prevention mechanism 21 includes a plurality of rakes 22 inserted into the gaps 13 of the screen 12 from the lower side of the screen 12 and the rakes 22 into the gaps of the screen 12 in which the rakes 22 are inserted. A moving mechanism 23 is provided for moving along.

  As shown in FIGS. 4 and 5, the moving mechanism 23 has a rotation axis in a direction perpendicular to the flow-down direction of the sewage disposed in parallel with the screen 12 at each of the upstream end and the downstream end of the screen 12. Have a sprocket 24 (upstream sprocket 24a and downstream sprocket 24b). An endless chain (or endless belt) 25 is stretched between the sprockets 24, and the endless chain 25 is circulated and driven by the rotational drive of one of the sprockets 24. In this embodiment, as shown in FIGS. 3 and 5, a waterproof motor 31 as a driving means is connected to the downstream sprocket 24b, and the upstream sprocket 24a is driven in accordance with the driving of the downstream sprocket 24b. It is configured to do. The sprockets 24a and 24b are rotatably supported on the side walls of the clogging prevention mechanism 21 arranged on both sides thereof. Moreover, the opening 26 (refer FIG. 2) extended along the longitudinal direction of the bowl-like body 11 through which the sewage which fell through the screen 12 passes is provided in the side wall at the side of the sewage outlet 2a. The opening on the side wall on the motor 31 side is not provided but is closed. The periphery of the motor 31 is surrounded by a waterproof sheet, and even if the sewage enters the motor 31 side beyond the side wall on the motor 31 side, the direct contact between the motor 31 and the sewage is suppressed.

  Each rake 22 inserted into each gap 13 of the screen 12 is connected to an endless chain 25, and moves along each gap 13 in the screen 12 as the endless chain 25 is circulated. To do. In the present embodiment, each rake 22 is configured to move through the gap 13 from the upstream side of the screen 12 toward the downstream side. In this configuration, the foreign matter removed from the gap 13 by the rake 22 is conveyed to the downstream end of the screen 12. And the foreign material conveyed to the downstream edge part of the screen 12 is conveyed downstream by the sewage which flows down the saddle-like body 11. FIG. In the present embodiment, each rake 22 inserted into each gap 13 of the screen 12 has an interval corresponding to each gap 13, that is, the horizontal width of the rod-shaped body 14 (width in the direction perpendicular to the sewage flow). Are arranged adjacent to each other in a direction parallel to the sprocket 24 with an interval corresponding to.

  Although not particularly limited, in this embodiment, two rakes 22 inserted into one gap 13 are connected to the endless chain 25 as shown in FIG. The two rakes 22 are arranged at equal intervals in the endless chain 25, and when one rake 22 reaches the downstream end of the screen 12, the other rake 22 is at the upstream end of the screen 12. It is inserted into the gap 13.

  Further, from the viewpoint of reducing the height of the clogging prevention mechanism 21, the rake 22 is not inserted into the gap 13 of the screen 12 (particularly, when the manhole bottom 1c is moved from the sprocket 24b toward the sprocket 24a). It is preferable that the is inclined sideways. In such a structure, for example, the rake 22 is tiltably provided with respect to a connecting member that connects the rake 22 and the endless chain 25, and the position varies depending on the standing state and the tilted state of the rake 22. This can be realized by providing a lever member. In this configuration, the clogging prevention mechanism 21 holds the lever member at a position where the rake 22 is erected when the rake 22 is inserted into the gap 13, and the lever when the rake 22 is inserted into the gap 13. A guide member for holding the member at a position where the rake 22 is tilted is further provided.

  Below the clogging prevention mechanism 21, a water collection guide portion 41 that receives sewage that has dropped through the screen 12 and guides the sewage to the sewage outlet 2 a is provided. In the present embodiment, the bottom 1c of the manhole 1a itself, that is, the above-described lower portion 77 and the stepped portion 76 constitute the water collection guide portion 41.

  As shown in FIGS. 2, 4, and 5, the lower portion 77 is provided below the screen 12 (the clogging prevention mechanism 21) and the sewage outlet 2 a. The lower portion 77 forms an inclined surface, and the screen 12 side is higher than the sewage outlet 2a side. That is, the sewage dropped through the screen 12 passes through the opening 26 of the clogging prevention mechanism 21 and is guided toward the sewage outlet 2a. As shown in FIGS. 2 and 3, a stepped portion 76 having an arcuate shape in plan view is provided on the upstream side sewage pipe 1 d side and the downstream side sewage pipe 1 b side of the lower portion 77. Therefore, the sewage falling through the screen 12 is guided to the sewage outlet 2a side without spreading to the upstream sewage pipe 1d side and the downstream sewage pipe 1b side. Moreover, as shown in FIG. 3, the sewage outlet 2a is connected to the side wall of the pipe mounting wall 73 having a circular shape in plan view. That is, in the vicinity of the sewage outlet 2a, the sewage drawn through the screen 12 is smoothly transferred to the sewage outlet 2a by the action of the stepped portion 76 and the inner surface (curved surface) of the pipe mounting wall 73 on the side of the sewage outlet 2a. And then flows into the sewage outlet 2.

  In addition, as shown in FIGS. 2-4, in this embodiment, the sand-proof wall 42 standingly arranged from the low rank part 77 is provided in the both sides of the sewer outlet 2a. The sand barrier wall 42 has a rectangular shape extending in the direction of the clogging prevention mechanism 21 in a plan view. Further, the height from the lower portion 77 is about 1/3 of the height of the stepped portion 76. The sand barrier wall 42 has a function of accumulating a part of the sand or the like that has passed through the screen 12 between the sand barrier wall 42 and the inner surface of the pipe mounting wall 73 to reduce the amount of sand flowing into the sewage extraction channel 2. Have Similar to the stepped portion 76, the sand barrier wall 42 may be integrally formed as an upper surface of the concrete 75, or may be fixedly installed on the lower portion 77 as a separate member.

  Moreover, in this sewage extraction structure 60, as shown in FIGS. 2-5, while closing between the bowl 11 and the inner surface of the pipe attachment wall 73, it is a pipe attachment wall from the upper end of the side wall of the bowl 11 A cover 16 constituting an inclined surface rising toward the inner surface of 73 is provided. Part or all of the cover 16 is configured to be detachable or openable / closable. The cover 16 above the water collection guide portion 41 has a function of preventing sewage that has overflowed the side wall of the bowl-shaped body 11 from flowing into the water collection guide portion 41. Further, when removing sand accumulated between the sand barrier wall 42 and the inner surface of the pipe mounting wall 73, the cover 16 is opened. Similarly, the cover 16 above the motor 31 has a function of preventing the motor 31 from being submerged by sewage overflowing the side wall of the bowl 11. Further, when the motor 31 is maintained, the cover 16 is opened. The cover 16 can be made of, for example, a metal such as stainless steel or a resin.

  In the case of a newly installed manhole, the sewage extraction structure 60 having the above structure is such that the concrete 75 constituting the manhole bottom 1c is low on the upper surface when the crushed stone foundation 71, the bottom slab 72, and the pipe mounting wall 73 are installed. A portion 77 and a stepped portion 76 are placed. Then, the clogging prevention mechanism 21 and the motor 31 are installed at a predetermined position of the lower portion 77. Thereafter, the bowl-shaped body 11 including the screen 12 is installed on the clogging prevention mechanism 21, and the cover 16 is installed on the bowl-shaped body 11. In addition, the screen apparatus may be configured by the screen 12 and the clogging prevention mechanism 21, and the hook body 11 having an opening at the bottom may be installed on the screen apparatus. In this case, a sealing process is appropriately performed between the opening of the bowl 11 and the outer periphery of the screen 12 of the screen device in order to prevent water leakage.

  On the other hand, when the sewage extraction structure 60 is provided for the existing manhole, after the invert at the bottom of the existing manhole is removed, the concrete 75 constituting the manhole bottom 1c is provided with a low-level portion 77 and a stepped portion 76 on the upper surface. Is placed in a state of having. The subsequent installation procedure is the same as that for the new manhole. In addition, when applying to an existing manhole, it is necessary to carry in all of the rod-shaped body 11, the clogging prevention mechanism 21, and the motor 31 from the inspection port 1e (refer FIG. 1) which is an entrance of the manhole 1a. When the diameters of the sewer pipes 2b and 2d are large, there is a possibility that they cannot be carried in from the inspection port 1e if the bowl-shaped body 11 is integrally formed. In this case, the bowl-shaped body 11 may be constituted by a member having a size that can be loaded from the inspection port 1e, and the bowl-shaped body 11 may be assembled inside the manhole 1a after loading into the manhole 1a. At this time, the joint portion of the member is appropriately subjected to a sealing process for preventing water leakage. The clogging prevention mechanism 21 and the motor 31 are also made up of a plurality of members as necessary for the purpose of reducing the weight of the member and reducing the size for carrying in using the step 78 (see FIGS. 4 and 5). It may be configured and assembled inside the manhole 1a.

  As described above, the sewage extraction structure 60 described above is a structure that draws sewage from the bottom of the sewage flow path, and there is no need to arrange a structure in the sewage flow path. In addition, since the screen 12 can be configured to be substantially flush with the bottom of the bowl 11 that is a sewage flow path, the sewage that does not contain impurities can be drawn out at a stable flow rate without hindering the flow of sewage. In addition, it can be easily applied to both new manholes and existing manholes.

  Furthermore, the sewage heat utilization system 10 to which the manhole 1a having such a sewage extraction structure 60 is applied requires a mechanism for returning the contaminants to the sewage pipe because the sewage introduced into the sewage extraction path 2 does not include the contaminants. And not. Therefore, it becomes possible to provide a sewage heat utilization system at low cost. Moreover, since this sewage heat utilization system 10 can draw out the sewage which does not contain a contaminant by the stable flow volume, without inhibiting the flow of sewage, stable heat utilization is attained.

  By the way, in the above-mentioned embodiment, although the water collection guide part 41 was comprised by the bottom 1c itself of the manhole 1a, it is also possible to implement | achieve the function of the said water collection guide part 41 with the container member carried in from the outside. . FIG. 6 is a view showing a water collection guide container 51 as the container member. The water collection guide container 51 is installed in place of the water collection guide portion 41 of the sewage extraction structure 60 described above.

  As shown in FIG. 6 (a), the water collection guide container 51 includes a mechanism installation unit 52 where the clogging prevention mechanism 21 is installed, and sewage for guiding sewage from the clogging prevention mechanism 21 to the sewage extraction path 2. And a guide 53. The mechanism installation unit 52 includes a bottom plate 52a having a rectangular shape in plan view, and standing plates 52b, 52c that are erected from the bottom plate 52a in the three directions of the motor 31 side, the upstream sewage pipe 1d side, and the downstream sewage pipe 1b side. 52d. In this example, the standing plates 52b, 52c, and 52d are each configured by a flat plate having a predetermined height that does not interfere with the bottom of the bowl-shaped body 11. The opening 26 of the clogging prevention mechanism 21 is arranged in a direction in which the standing plates 52b, 52c, 52d are not provided in the bottom plate 52a (direction of the sewage guide portion 53). The bottom plate 52 a has a size that matches the clogging prevention mechanism 21.

  The sewage guide 53 includes a bottom plate 53a having a rectangular shape in plan view, and a standing plate 53b that is erected from the bottom plate 53a in the three directions of the sewage extraction channel 2 side, the upstream sewage pipe 1d side, and the downstream sewage pipe 1b side, 53c and 53d. In this example, the bottom plate 53a is configured as a member integrated with the bottom plate 52a. Further, the standing plates 53c and 53d are formed of a flat plate, and each upper end thereof is configured by a hook contact side 53s that contacts the hook 11 and a cover contact side 53t that contacts the cover 16. The flange contact side 53 s is formed by a curve that matches the outer surface of the cover 11, and the cover contact side 53 t is formed by a straight line that matches the bottom surface of the cover 16. The standing plate 53b is made of a plate material having a curved surface that matches the inner surface of the pipe mounting wall 73, and an opening 53r that matches the sewage outlet 2a is formed at a position corresponding to the sewage outlet 2a. . The upper end of the erected plate 53 b is configured by a straight line that matches the lower surface of the cover 16.

  As described above, the water collection guide container 51 is surrounded by the bottom plates 52a and 53a and the standing plates 52b, 52c, 52d, 53b, 53c, and 53d, and communicates with the sewage extraction passage 2 through the standing plate 53b. It is comprised as a container provided with the opening 53r. Further, when the top surfaces of the bottom plates 52a and 53a are installed on the bottom 1c of the manhole 1a, the height gradually decreases from the mechanism installation unit 52 toward the standing plate 53b side (opening 53r) of the sewage guide unit 53. It is configured as follows. For example, when installing on the concrete 75 which has a horizontal upper surface, the baseplates 52a and 53a which varied thickness so that the above-mentioned conditions may be employ | adopted are employable. Moreover, when making the upper surface of the concrete 75 into the inclined surface which satisfies the above-mentioned conditions, the baseplates 52a and 53a which have uniform thickness can be employ | adopted. In addition, fixation of the water collection guide container 51 to the concrete 75 upper surface can be implemented with an anchor etc., for example. Moreover, the water collection guide container 51 can be comprised with metals, such as stainless steel, and resin, for example.

  In the case of a newly installed manhole, the sewage extraction structure 60 including the water collection guide container 51 having the above structure is a concrete 75 constituting the manhole bottom 1c in a state where the crushed stone foundation 71, the bottom plate 72, and the pipe mounting wall 73 are installed. However, it is driven in the state which has a horizontal surface (or inclined surface) on the upper surface. And the water collection guide container 51 is installed, and the clogging prevention mechanism 21 is arranged in the mechanism installation part 52 of the water collection guide container 51. The motor 31 is installed outside the standing plate 52b. Then, the bowl-shaped body 11 including the screen 12 is installed on the clogging prevention mechanism 21 and the water collection guide container 51, and the cover 16 is installed on the bowl-shaped body 11. Note that, as described above, the screen device may be configured by the screen 12 and the clogging prevention mechanism 21, and the bowl-shaped body 11 having an opening at the bottom may be installed on the screen device.

  On the other hand, when the sewage extraction structure 60 including the water collection guide container 51 is provided for the existing manhole, after the invert at the bottom of the existing manhole is removed, the concrete 75 constituting the manhole bottom 1c is placed on the horizontal surface on the upper surface. (Or an inclined surface). The subsequent installation procedure is the same as that for the new manhole. In addition, when applying to an existing manhole, it is necessary to carry in the water collection guide container 51 from the inspection port 1e of the manhole 1a. In this case, for example, as shown in FIG. 6 (b), the water collection guide container 51 is made up of a member 521 composed of a bottom plate 52a and standing plates 52b, 52c, 52d, and standing plates 53b, 53c, 53d. From the member 531 composed of the upper part, a part of the bottom plate 53a, the member 532 composed of a part of the lower part of the standing plates 53c, 53d, the other part of the bottom plate 53a, and the other part of the lower part of the standing plates 53c, 53d What is necessary is just to comprise the member 533 comprised, and to carry out the water collection guide container 51 by assembling each member inside the manhole 1a after carrying in to the manhole 1a. In this case, the joint portion of the member is appropriately subjected to a sealing process for preventing water leakage. Even in this case, as described above, the bowl-shaped body 11, the clogging prevention mechanism 21, and the motor 31 can be configured by a plurality of members.

  As described above, the sewage extraction structure 60 including the water collection guide container 51 does not need to be provided with the stepped portion 76 and the like by placing concrete as in the case where the water collection guide portion 41 is used. That is, what is necessary is just to comprise the manhole bottom 1c which has a horizontal (or inclined surface) on the upper surface, and in addition to the effect which the sewage extraction structure 60 provided with the above-mentioned water collection guide part 41 has, concrete placement work becomes simple, The effect that it can be installed very easily can be obtained.

  The water collection guide container 51 is not limited to the form shown in FIG. 6, and any form can be adopted as long as it can guide the sewage dropped through the screen 12 to the sewage extraction path 2. For example, instead of the sewage guide 53 shown in FIG. 6A, a sewage guide 54 whose upper side is closed as shown in FIG. 7A may be employed. The sewage guide portion 54 includes a bottom plate 54a having a rectangular shape in plan view, and a standing plate 54b that is erected from the bottom plate 54a in the three directions of the sewage extraction path 2 side, the upstream sewage pipe 1d side, and the downstream sewage pipe 1b side. , 54c, 54d. The standing plates 54c and 54d are formed of a flat plate having a height that does not interfere with the bowl-shaped body 11, and the standing plate 54b has a curved surface that matches the inner side surface of the pipe mounting wall 73, and It is comprised with the board | plate material of the same height as board 54c, 54d. The standing plate 54b is provided with an opening 54r aligned with the sewage outlet 2a at a position corresponding to the sewage outlet 2a. The top plate 54e is supported on the upper ends of the standing plates 54a, 54c, and 54d. In this configuration, when the above-described sand barrier wall 42 is provided in the sewage guide portion 54, a part or all of the top plate 54e is configured to be freely opened and closed.

  Moreover, as shown in FIG.7 (b), it is also possible to employ | adopt the water collection guide container 51 provided with only the sewage guide part 54, without providing the mechanism installation part 52. FIG. In this case, the sewage that has dropped through the screen 12 is guided by the upper surface of the concrete 75 between the lower side of the clogging prevention mechanism 21 and the sewage guide 54.

  The above-described embodiments do not limit the technical scope of the present invention, and various modifications and applications other than those already described are possible within the scope of the present invention. For example, in the above-described embodiment, a configuration in which a plurality of gaps of the screen are arranged along the sewage flow of the rod-shaped body has been described as a particularly preferable mode. However, the present invention does not exclude making the plurality of gaps in other directions. Moreover, in the said embodiment, although the example which an upstream sewage pipe and a downstream sewage pipe oppose was illustrated, when an upstream sewage pipe and a downstream sewage pipe do not oppose, ie, a rod-like body is bent. Even in this case, the present invention can be applied.

  Moreover, in the said embodiment, in order to guide efficiently the sewage which fell through the screen to a sewer outlet, it was set as the structure which provided the inclination in the low-order part of a water collection guide part, or the bottom plate of a water collection guide container. However, in the configuration in which the sewage extraction path is connected to the pit side wall at a predetermined height above the pit bottom lower than the manhole bottom as in the above embodiment, the lower part of the water collection guide part and the bottom plate of the water collection guide container are assumed. Even if is horizontal, the sewage that has fallen through the screen naturally flows down the sewage outlet due to the head difference, so it is possible to introduce sewage into the pit.

  In addition, in the said embodiment, although the planar view shape of the water collection guide part and the water collection guide container was made into the substantially rectangular shape, arbitrary shapes are employable in the range with the effect | action which guides sewage.

  ADVANTAGE OF THE INVENTION According to this invention, the sewage heat utilization system which reduced installation cost remarkably compared with the former can be implement | achieved, and is useful as a sewage heat utilization system.

1 Sewage pipe 1a Manhole 1b Downstream sewage pipe 1d Upstream sewage pipe 1e Inspection port 2 Sewage outlet pipe 2a Sewage outlet 4 Heat exchange section 5 Sewage return path (discharge path)
DESCRIPTION OF SYMBOLS 10 Sewage heat utilization system 11 Rod-like body 12 Screen 13 Gap 16 Cover 21 Clogging prevention mechanism 22 Rake 23 Movement mechanism 31 Motor (drive means)
41 Catchment Guide 51 Catchment Guide 60 Sewage Drawer Structure

Claims (5)

A manhole to which a sewage extraction path for drawing sewage for heat utilization is connected,
A bowl-shaped body comprising a screen having a plurality of gaps at the bottom, and causing sewage to flow between the upstream sewage pipeline and the downstream sewage pipeline,
A clogging prevention mechanism comprising: a rake inserted into each gap of the screen from a lower side of the screen; and a moving mechanism for moving the rake along the gap into which the rake is inserted;
Driving means for driving the moving mechanism;
Receiving the sewage that has fallen through the screen, guiding the dropped sewage and introducing it into the sewage outlet connected to the side wall of the manhole;
With a manhole. The water collection guide portion is configured integrally with the bottom of the manhole, and each of the bowl-shaped body, the clogging prevention mechanism, and the driving means is a size that can be carried into an inspection port provided in the manhole. Comprising one or more members of
2. The manhole according to claim 1, wherein the rod-shaped body, the clogging prevention mechanism, and the driving unit are assembled and installed on the water collection guide portion inside the manhole. A sewage extraction unit installed in a manhole to which a sewage extraction path for drawing sewage for heat utilization is connected,
A bowl-shaped body comprising a screen having a plurality of gaps at the bottom, and causing sewage to flow between the upstream sewage pipeline and the downstream sewage pipeline,
A clogging prevention mechanism comprising: a rake inserted into each gap of the screen from a lower side of the screen; and a moving mechanism for moving the rake along the gap into which the rake is inserted;
Driving means for driving the moving mechanism;
A water collection guide vessel installed at the bottom of the manhole, receiving the sewage falling through the screen, and guiding the dropped sewage into the sewage extraction channel connected to the side wall of the manhole,
A sewage drawer unit comprising: Each of the bowl-shaped body, the clogging prevention mechanism, the driving means, and the water collection guide container is constituted by one or a plurality of members having a size that can be carried into the inside from an inspection port provided in the manhole,
The sewage extraction unit according to claim 3, wherein the bowl-shaped body, the clogging prevention mechanism, the driving means, and the water collection guide container are assembled and installed on a bottom portion of the manhole. A sewage extraction channel for drawing sewage from the sewage pipeline,
The manhole according to claim 1 or 2, or the sewage extraction unit according to claim 3 or 4, which is provided in the sewage pipe and is connected to the sewage extraction path and introduces sewage into the sewage extraction path. With manholes,
A heat exchanging section for exchanging heat with the sewage drawn by the sewage draw pipe
A discharge path for discharging the sewage heat-exchanged in the heat exchange section into the sewage pipe,
A sewage heat utilization system.

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