JP2008261223A - Public basin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily mount a backflow prevention device, which prevents wastewater flowing back from being spouted from drainage equipment, in an existing public basin. <P>SOLUTION: A public basin body 1 allows the connection of a backflow prevention device body 15 from an inside opening end of an inflow-side connecting port 2, and the backflow prevention device body 15 is provided with a valve body 16 which is opened into the public basin by the wastewater flowing in from the inflow-side connecting port 2. The inflow-side connecting port 2 of the public basin body 1 has an inside diameter approximately equal to the outside diameter of the backflow prevention device body 15 connected to the inflow-side connecting port 2 from the inside of the public basin body 1, and the outside diameter of an inflow-side connecting pipe 12 connected to the inflow-side connecting port 2 from the outside of the public basin body 1. An intermediate portion of the inflow-side connecting port 2 is equipped with a stopper step portion 40 which has a diameter approximately equal to the inside diameter of the backflow prevention device body 15 and that of the inflow-side connecting pipe 12 and which abuts on each of an end of the backflow prevention device body 15 and that of the inflow-side connecting pipe 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a public dredger that can prevent drainage flowing back from the public dredger from being discharged from the drainage facility.

  In general, wastewater discharged from each drainage facility in the household flows into a residential land installed in the residential land through a drain branch pipe connected to the drainage facility, and is discharged directly from this residential land or through another residential land. It is merged into one public dredging and finally discharged from this public dredging to the sewer main.

  In recent years, the amount of wastewater flowing into this sewer main has increased, and in particular when a large amount of rainwater flows into the sewer main due to typhoons, the drainage capacity of the sewer main has been exceeded, and overflowed wastewater or air pumped by this wastewater has become public. There is a problem that the drainage branch pipes flow backward through the dredging, and drainage or air blows out from the drainage facilities into the building.

  Therefore, conventionally, a hook-shaped engagement portion is provided on the inner wall surface near the inner opening end of the inflow side connection port for connecting the inflow side connection pipe of the drainage drainage main body, and the inflow side connection port is provided in this engagement portion. A structure is known in which an inner end portion is rotatably attached to a valve element that is opened by drainage flowing into the drainage basin from the inflow side connection port (see, for example, Patent Document 1).

  In this conventional backflow prevention device, it is difficult to form a hook-like engaging portion that integrally supports the valve body so as to be openable and closable in a drainage basin that has been injection-molded with synthetic resin. In the configuration in which the valve body is attached to the hook-shaped engagement portion of the above-mentioned hook so as to be opened and closed, there is a problem that the valve body cannot be attached to the existing drainage tub.

  Conventionally, a configuration is known in which a backflow prevention device in which a valve body is attached to an inflow side connection port of a drainage can be opened and closed (see, for example, Patent Document 2).

However, in recent years, instead of the public fences molded from concrete, small public fences molded from synthetic resin have been widely adopted, and this small public fence has a configuration with a nominal diameter of mainly 200 mm, In general, the burial depth of public pits is often set to about 800 mm. For small public pits with a nominal diameter of about 200 mm, a backflow prevention device is installed from the existing public pit to the inflow side connection port. It is difficult to install.
JP-A-10-195969 (2nd page, 3rd page, FIG. 4, FIG. 7) Japanese Utility Model Publication No. 61-152089 (first page, FIGS. 1 to 3)

  The problem to be solved is that the backflow prevention device for preventing the drainage flowing back from the public dredger from being discharged from the drainage facility cannot be easily attached to the public dredger.

  The present invention has been made in view of the above points, and it is possible to easily attach a backflow prevention device for preventing drainage flowing back from a public basin from being discharged from a drainage facility to the public basin, and smooth drainage. It is intended to provide a public trap to be performed.

  The public fence of the present invention forms an inflow side connection port, an outflow side connection port, an invert portion that connects the inflow side connection port and the outflow side connection port, and a cleaning port that opens above the invert portion, and A public fence main body capable of connecting to the inflow side connection port a backflow prevention device main body provided with a valve body that opens toward the inside of the public fence by drainage flowing from the inflow side connection opening at the inner opening end of the inflow side connection opening. The inflow side connection port of the public fence main body is connected to the inflow side connection port from the inside of the public fence body and the outer diameter of the backflow prevention device main body and the inflow side connection port from the outside of the public fence body. The inner diameter of the inflow side connecting pipe to be connected is approximately equal to the outer diameter, and the backflow preventing apparatus main body and the inflow side are substantially equal to the inner diameter of the backflow preventing apparatus main body and the inner diameter of the inflow side connecting pipe at the intermediate portion of the inflow side connecting port. Abut each end with the connecting pipe It is obtained by forming a stopper stepped portion.

  And when attaching the backflow prevention device main body to the inflow side connection port of the public fence main body, insert the backflow prevention device body into the inflow side connection port until it hits the stopper step of the inflow side connection port of the public dredge main body. The inflow side connection pipe connected to the side connection port is also inserted and connected until it hits the stopper step of the inflow side connection port, and the inner diameter of the inflow side connection port and the outer diameter of the backflow prevention device main body and the inflow side connection pipe Since the stopper step has substantially the same inner diameter as the backflow prevention device main body and the inflow side connecting pipe, no step is formed in the inflow side connection port on the upstream side of the backflow prevention device main body. The solid matter is not clogged, and drainage is performed smoothly.

  By connecting the backflow prevention device main body to the inflow side connection pipe of the public dredge main body, the public dredge of the present invention prevents backflow even if drainage overflowing from the sewer main flows back to the public dredging body from the outflow side connection port. Since the waste water flowing backward by the valve body provided in the apparatus main body does not enter the inflow side connection port, the waste water and the air pumped by this waste water do not blow out from the drainage equipment in the house. Also, since the inner diameter of the inflow side connection port is substantially equal to the outer diameter of the backflow prevention device main body and the inflow side connection pipe, and the stopper step portion is substantially equal to the inner diameter of the backflow prevention device main body and the inflow side connection pipe, In the mouth, no step is formed on the upstream side of the backflow prevention device main body, so that the solid matter mixed in the drainage is not clogged, and the drainage is performed smoothly.

  A public hall which is a premise of the present invention will be described with reference to FIGS.

  The public fence body 1 is formed of synthetic resin, and has an inflow side connection port 2, an outflow side connection port 3, an invert portion 4 that connects the inflow side connection port 2 and the outflow side connection port 3, and the invert portion 4. And a cleaning port 5 opened upward. The cleaning port 5 is formed as a receiving port, and a lower end portion of the rising pipe 6 is fitted into the cleaning port 5 of the receiving port, and a frame body 7 is fitted to the upper end portion of the rising tube 6.

  The frame body 7 has a substantially cylindrical fitting insertion portion 8 having an outer diameter substantially the same as the inner diameter of the riser tube 6, and an annular portion on the inner peripheral portion of the upper end opening of the frame body 7. A support portion 10 is formed, and a substantially disk-shaped cleaning port lid (not shown) is supported on the support portion 10 so as to be freely opened and closed.

  Further, the outer end side of the inflow side connection port 2 of the public dredging body 1 is formed with an upstream side connection pipe connection portion 13 having an inner diameter substantially the same as the outer diameter of the upstream inflow side connection pipe 12 communicating with the drainage equipment. In addition, the inner diameter of the inflow side connection pipe 12 inserted and connected to the inflow side connection port 2 and the inner diameter of the inner end side of the inflow side connection port 2 are formed to be substantially the same.

  Next, the backflow prevention device main body 15 attached to the inflow side connection port 2 of the public fence body 1 is connected to the inner diameter of the inflow side connection port 2 of the public fence body 1 and the upstream connection pipe connection of the inflow side connection port 2. It is formed in a substantially cylindrical shape having an outer diameter substantially equal to the inner diameter of the inflow side connecting pipe 12 connected to the portion 13, and one end side of the backflow prevention device main body 15 is inflow from the inflow side connection port 2 of the public fence main body 1. The inflow side connection pipe 12 connected to the side connection port 2 is inserted and connected.

  The other end side of the backflow prevention device main body 15 is formed on an end surface that is inclined in a direction extending from the upper end portion to the lower side, and flows into the other end side end surface that becomes the inner opening end from the inflow side connecting pipe 12. A valve body 16 opened toward the inside of the public fence main body 1 by drainage is provided so as to be openable and closable. The upper end portion of the valve body 16 is pivotally supported by a shaft support projection 17 provided on the upper end of the other end side of the backflow prevention device main body 15 so as to be rotatable.

  Further, a supported portion 21 for press-fitting or screwing a support rod 20 is provided on an upper portion of the portion of the backflow prevention device main body 15 protruding from the inflow side connection port 2 of the public fence main body 1. The support rod 20 connected to the cleaning rod 5 of the public fence main body 1 is provided with a bent portion 23 that forms a support rod holding portion 22 having a length substantially equal to the inner diameter of the rising pipe 6. Yes. The bent portion 23 is pivotally supported by a shaft 24, for example.

  Further, the backflow prevention device main body 15 is inserted into the inflow side connection port 2 from the public fence main body 1 on both sides of the portion protruding from the inflow side connection port 2 of the backflow prevention device main body 15. The attachment portions 26 are provided on the left and right sides in a protruding shape.

  As shown in FIG. 5, the attachment device 25 includes a pressing portion 28 provided with a hook-like engagement portion 27 that is detachably engaged with the left and right attachment portions 26 of the backflow prevention device body 15 from above. A pair of one link 29, 29 having one end portion rotatably connected to the pressing portion 28, and one end portion of the other pair of links 30, 30 are connected to the other end portion of the pair of one link 29, 29, respectively. The other end of the pair of other links 30, 30 is rotatably connected to the fixed portion 31, and the other end of the one link 29 located on the lower side and the other link. The lower end portion of the operating shaft 33 is rotatably attached to the connecting portion 32 with one end portion of the 30, and the connecting portion between the other end portion of the one link 29 located on the upper side and one end portion of the other link 30 A thread groove formed in an intermediate portion of the operation shaft 33 is screwed to 34, and a handle portion 38 (FIGS. 9 and 10) is formed on the upper end portion of the operation shaft 33. Shown) is formed, the jack type pressing mechanism 35 is constituted by the pair of one of the links 29 and 29, a pair of the other link 30, 30 and actuating shaft 33.

  Further, as shown in FIG. 6, the attachment device 25 has a wall plate portion 36 that is substantially perpendicular to the axial center of the inflow side connection port 2 and substantially coincides with the curved surface of the inner wall surface of the public fence main body 1. A fixing portion 31 of the jack type pressing mechanism 35 is attached to the wall plate portion 36. The wall plate 36 prevents the attachment device 25 from entering the outflow side connection port 3 of the public fence body 1 and can be installed stably. The height of the wall plate 36 is on the outflow side. It is formed higher than the height of the connection port 3.

  Next, a method for attaching the public fence backflow prevention device to the public fence will be described with reference to FIGS.

  In the first step, as shown in FIG. 8, the backflow prevention device main body 15 housed therein is supported by a support bar 20 disposed in the cleaning port 5 of the public fence main body 1, and this backflow prevention device main body 15 is supported. This is a process of facing the vicinity of the opening end of the inflow side connection port 2 of the public fence main body 1.

  In the second step, as shown in FIG. 9, the attachment device 25 is accommodated in the public fence body 1, and the jack-type pressing mechanism 35 of the backflow prevention device body 15 is attached to the attachment portion 26 formed in the backflow prevention device body 15. The connecting device 25 is attached to the backflow prevention device main body 15 by engaging the hook-like engaging portion 27, and the connection end of the backflow prevention device main body 15 having an outer diameter substantially equal to the inner diameter of the inflow side connection port 2 of the public fence main body 1. The mounting device 25 is installed in a state in which the wall plate portion 36 is in contact with the inner wall surface where the outflow side connection port 3 facing the inflow side connection port 2 is opened. It is.

  In the third step, as shown in FIG. 10, the jack-type pressing mechanism 35 of the attachment device 25 is operated to insert the connection end portion of the backflow prevention device body 15 into the inflow side connection port 2 and insert the backflow prevention device. This is a step of connecting the connection end of the main body 15 to the inflow side connection port 2.

  As shown in FIG. 11, the fourth step is a step of removing the attachment device 25 from the attachment portion 26 of the backflow prevention device body 15 and taking out the attachment device 25 from the public fence body 1.

  Next, the operation of the public fence which is the premise will be described with reference to FIGS.

  As shown in FIG. 8, the cleaning mouth lid installed on the ground surface is removed from the frame body 7, and the backflow prevention device main body 15 is connected to the public fence main body 1 from the rising pipe 6 connected to the cleaning mouth 5 of the existing public fence main body 1. Store inside. At this time, by connecting the support rod 20 to the supported portion 21 formed in the backflow prevention device main body 15, the support rod 20 is operated from the upper end opening of the frame body 7 attached to the rising pipe 6 on the ground. The connection end portion of the prevention device main body 15 is made to face the inflow side connection port 2 of the public fence main body 1 (first step).

  Next, as shown in FIG. 9, the hook-like engagement portion 27 of the attachment device 25 is engaged with the attachment portion 26 of the backflow prevention device body 15 to attach the attachment device 25 to the backflow prevention device body 15. The connection end of the main body 15 faces the inflow side connection port 2 of the public fence main body 1, and the wall plate 36 is in contact with the inner wall surface where the outflow side connection port 3 facing the inflow side connection port 2 is opened. Install the unit in the same condition. In this state, the jack-type pressing mechanism 35 is operated by operating the operating shaft 33 of the mounting device 25 with the handle portion 38 from the upper end opening of the rising pipe 6 on the ground. As shown in FIG. 7, the jack-type pressing mechanism 35 is configured such that the connecting portion 34 of the upper links 29 and 30 screwed with the thread grooves formed on the outer periphery of the operating shaft 33 is lowered by the rotation of the operating shaft 33. One link 29, 29 and the other link 30, 30 expand, and the distance between the pressing portion 28 and the fixing portion 31 increases, and the pressing portion 28 presses the connection end of the backflow prevention device main body 15, and at this time, the wall plate Since the portion 36 is in contact with the inner wall surface of the public fence main body 1, the attachment device 25 is stably held, and the backflow prevention device main body 15 is pushed into the inflow side connection port 2 from the public fence main body 1 and flows in. The side connection port 2 is inserted and connected (second step).

  Subsequently, when the jack type pressing mechanism 35 is operated by operating the handle portion 38, the inner diameter of the inflow side connection port 2 of the public fence body 1 and the inner diameter of the inflow side connection tube 12 connected to the inflow side connection port 2 are substantially reduced. A substantially cylindrical backflow prevention device main body 15 having an equal outer diameter is inserted and connected from the inflow side connection port 2 to the inflow side connection tube 12 connected to the inflow side connection port 2. In this state, the support rod 20 connected to the backflow prevention device main body 15 is in contact with the inner wall surface of the public fence main body 1.

  Furthermore, when the backflow prevention device main body 15 is inserted and connected to the inflow side connection port 2 of the public fence main body 1, the operation shaft 33 of the jack-type pressing mechanism 35 of the mounting device 25 is rotated in the opposite direction. As shown in FIG. 5 from the state shown in FIG. 7, the links 29, 29, 30, 30 are rotated to narrow the distance between the pressing portion 28 and the fixing portion 31, and the hook-like engaging portion 27 is connected to the backflow prevention device main body 15. Is inserted and connected to the inflow side connection port 2 of the public fence body 1, so that the wall plate portion 36 side of the mounting device 25 moves toward the backflow prevention device main body 15, and the wall plate portion 36 is inside the public fence main body 1. When the handle portion 38 is pulled upward in this state after being separated from the wall surface, the attachment device 25 is pulled up from the public fence body 1 and the attachment device 25 is taken out from the rising pipe 6 as shown in FIG. (Fourth step).

  Next, as shown in FIG. 1, after the work of attaching the backflow prevention device main body 15 to the inflow side connection port 2 of the public fence main body 1 is completed, the support rod 20 substantially along the inner wall surface of the public fence main body 1 is bent. When bent from the portion 23, the support rod holding portion 22 is fitted and connected to the cleaning port 5 of the receiving port of the public fence main body 1, and has a length substantially the same as the inner diameter of the rising tube 6 having an inner diameter substantially equal to the inner diameter of the cleaning port 5. The tip of the support rod holding portion 22 of the support rod 20 formed and disposed along the inner wall surface of the rising pipe 6 that is located on the inflow side connection port 2 side in the public fence main body 1 and connected to the cleaning port 5 Is opposed to the inner wall surface on the opposite side of the riser 6, and the support rod 20 is held to prevent the backflow prevention device main body 15 from coming off the inflow side connection port 2 of the public fence main body 1.

  In this way, the backflow prevention device main body 15 can be attached to the inflow side connection port 2 of the existing public fence body 1 from the inside of the public fence body 1.

  When the backflow prevention device main body 15 is disconnected from the inflow side connection port 2 of the public fence main body 1, the backflow prevention device main body 15 is connected to the public fence main body 1 because the support rod 20 is connected to the backflow prevention device main body 15. From the outflow side connection port 3 to the sewer main side.

  And the backflow prevention apparatus main body 15 attached to the inflow side connection port 2 of the public dredging main body 1 was provided in the backflow prevention apparatus main body 15 even if the waste water overflowed from the sewer main flowed back to the public dredging main body 1. Since the waste water flowing backward by the valve body 16 does not enter the inflow side connection port 2, the waste water and the air pumped by the waste water are not ejected from the drainage equipment in the house.

  Moreover, since the valve body 16 provided in the backflow prevention apparatus main body 15 attached to the inflow side connection port 2 is opened toward the inside of the public fence body 1, the drainage discharged from each drainage facility is opened to the public fence body. It flows into 1 and is discharged from the outflow side connection port 3 to the sewer main.

  Next, the best embodiment of the public fence according to the present invention will be described with reference to FIGS.

  In the above-mentioned public urn, the substantially cylindrical backflow prevention device main body 15 is approximately equal to the inner diameter of the inflow side connection port 2 of the public tub main body 1 and the inner diameter of the inflow side connection tube 12 connected to the inflow side connection port 2. The backflow prevention device main body 15 has the same outer diameter and is configured to be inserted and connected from the inflow side connection port 2 of the public fence main body 1 to the inflow side connection tube 12 connected to the inflow side connection port 2. Then, the inner diameter of the inflow side connection port 2 of the public fence body 1 is such that the outer diameter of the backflow prevention device main body 15 connected to the inflow side connection port 2 and the inflow side connection tube 12 connected to the inflow side connection port 2. The other configuration is the same as the above-mentioned public fence.

  In this embodiment, the public fence main body 1 has an inflow side connection port 2, an outflow side connection port 3, an invert portion 4 connecting the inflow side connection port 2 and the outflow side connection port 3, and above the invert portion 4. The inflow side connection port 2 of the public fence main body 1 is formed with an opening diameter of the cleaning port 5, and the outer diameter of the backflow prevention device main body 15 connected to the inflow side connection port 2 from the inside of the public fence body 1. The inner diameter is approximately equal to the outer diameter of the inflow side connection pipe 12 connected to the inflow side connection port 2 from the outside of the public fence main body 1. Further, the end portions of the backflow prevention device main body 15 and the inflow side connection tube 12 are brought into contact with the intermediate portion of the inflow side connection port 2 substantially equal to the inner diameter of the backflow prevention device body 15 and the inner diameter of the inflow side connection tube 12, respectively. A stopper step 40 is formed. And the other structure is the same as the public fence which becomes the said premise.

  Next, the operation of this embodiment will be described.

  When the backflow prevention device main body 15 is attached to the inflow side connection port 2 of the public fence main body 1, the backflow prevention device body 15 is attached to the inflow side connection port 2 until it hits the stopper step 40 of the inflow side connection port 2 of the public dredge main body 1. The inflow side connection pipe 12 connected to the inflow side connection port 2 is also inserted and connected until it hits the stopper step portion 40 of the inflow side connection port 2.

  The inner diameter of the inflow side connection port 2 and the outer diameters of the backflow prevention device main body 15 and the inflow side connection pipe 12 are substantially equal, and the stopper step portion 40 has substantially the same inner diameters of the backflow prevention device main body 15 and the inflow side connection pipe 12. In the inflow side connection port 2, no step is formed on the upstream side of the backflow prevention device main body 15, the solid matter mixed in the drainage is not clogged, and the drainage is performed smoothly. Even if the backflow prevention device main body 15 is attached to the public dredger main body 1, there is no step on the upstream side of the backflow prevention device main body 15 in the inflow side connection port 2, and drainage is performed smoothly.

  In addition, the method of attaching to the inflow side connection port 2 of the public fence main body 1 is also the same as the public fence which becomes the premise.

  Moreover, in the said embodiment, although it was set as the structure which formed the inflow side connection port 2 and the one outflow side connection port 3 in the public fence main body 1 facing each other, it is not restricted to this structure. In the public fence main body 1 in which the inflow side connection port 2 and one outflow side connection port 3 are formed, the backflow prevention device main body 15 is attached to each inflow side connection port 2.

  In each of the above-described embodiments, the backflow prevention device main body 15 is attached using the attachment device 25. However, when the rising pipe 6 is low, the backflow prevention device main body 15 is not used without using the attachment device 25. The support rod 20 is connected to the supported portion 21 formed in the above, and the backflow prevention device main body 15 is pushed into the inflow side connection port 2 from the inside of the public fence main body 1 by the operation of the support rod 20 and connected to the inflow side connection port 2 You can also

It is a vertical side view of the public fence which attached the backflow prevention apparatus used as the premise of this invention. It is a top view same as the above. It is a vertical side view of a backflow prevention apparatus same as the above. It is a side view of a backflow prevention apparatus same as the above. It is a side view of an attachment apparatus same as the above. It is a top view of an attachment apparatus same as the above. It is a side view of the press operation state of the press mechanism of a mounting apparatus same as the above. It is a vertical side view which shows the process of attaching a backflow prevention apparatus same as the above to a public fence. It is a vertical side view which shows the process of attaching a backflow prevention apparatus same as the above to a public fence. It is a vertical side view which shows the process of attaching a backflow prevention apparatus same as the above to a public fence. It is a vertical side view which shows the process of attaching a backflow prevention apparatus same as the above to a public fence. It is a vertical side view of the public fence which attaches the backflow prevention apparatus which shows one embodiment of this invention. It is a top view of the public fence which attached the backflow prevention apparatus same as the above. It is a vertical side view of the public fence which attached the backflow prevention apparatus same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Public dredging body 2 Inflow side connection port 3 Outflow side connection port 4 Invert part 5 Cleaning port
12 Inlet connection pipe
15 Backflow prevention device
16 Disc
40 Stopper step

Claims (1)

Forming an inflow side connection port, an outflow side connection port, an invert portion connecting the inflow side connection port and the outflow side connection port, and a cleaning port opened above the invert portion, and inside the inflow side connection port Provided with a public dredge main body capable of connecting to the inflow side connection port a backflow prevention device main body provided with a valve body that opens toward the inside of the public dredge by drainage flowing into the open end from the inflow side connection port,
The inflow side connection port of the public fence main body is connected to the inflow side connection port from the outside of the backflow prevention device main body connected from the inside of the public fence body and the inflow side connection port from the outside of the public fence body. The inner diameter is approximately equal to the outer diameter of the inflow side connecting pipe.
A stopper step portion is formed at the intermediate portion of the inflow side connection port to contact the end portions of the backflow prevention device body and the inflow side connection pipe, which are substantially equal to the inner diameter of the backflow prevention device body and the inner diameter of the inflow side connection pipe. A public fence characterized by

Images