JP2021080696A - Water cut-off device, and installation method and removal method of water cut-off device - Google Patents

Abstract

To allow easy connection operation and maintenance of piping by connecting an inspection frame with an inspection opening to a body frame.SOLUTION: A water cut-off device 1 cuts off water with a water cut-off plate 50 which is buried in the ground or a floor surface and rises through buoyancy caused by water flowing into the device, wherein the water cut-off device is provided with a concrete frame 10 and a water cut-off unit 40, and the concrete frame is provided with: a concrete body frame 20 buried in the ground or the floor surface which is provided with an opening part 21 on its top surface, a fitting groove 22 arranged downward from the opening part, and a first through hole 23 in communication with the fitting groove in its side surface for connection operation and insertion of a pipe; and a concrete inspection frame 20 connected to the body frame and provided with a second through hole 32 corresponding to the first through hole and an inspection opening 34 on its top surface.SELECTED DRAWING: Figure 2

Description

The present invention relates to a water stop device which is buried in the ground or a floor surface and obtains buoyancy by water flowing into the device to raise a water stop plate to block the water, and a method for installing and removing the water stop device.

Conventionally, for the purpose of installing a highly accurate movable tide door in a short period of time, Japanese Patent Application Laid-Open No. 2005-2662 describes a movable door unit having a door accommodating chamber for accommodating a movable tide door so as to be able to move up and down at least in a factory. Manufacture, transport the movable door unit from the factory to the installation site, place and fix the movable door unit on the foundation of the embankment at the installation site, and move the movable door during manufacturing at the factory or after installation at the installation site. A method for constructing a tide-proof structure for assembling a movable tide-proof door and an elevating drive device thereof in a door accommodating chamber formed in the unit is disclosed.

Japanese Unexamined Patent Publication No. 2005-2662

However, in the technique disclosed in Patent Document 1, there is no particular description about the drainage of the water flowing into the door accommodating chamber and the drainage pipe. Further, in general, a device that automatically raises a water stop plate to block water has a problem that it is difficult to connect pipes and perform maintenance because the device is buried in a road or the like.

The present invention has been made in view of the above points, and by connecting an inspection frame provided with an inspection port to the main body frame, a water stop device and a water stop device can be easily installed and removed for easy pipe connection work and maintenance. The purpose is to provide a method.

(1) The water stop device of the present invention is
A water stop device that is buried in the ground or floor and gains buoyancy by the water flowing into the device, and the water stop plate rises to block the water.
The water stop device includes a concrete frame and a water stop unit.
The concrete frame
It is buried in the ground or floor, and has an opening on the upper surface, a fitting groove provided downward from the opening, and a first penetration for connecting the fitting groove and the connecting pipe and passing the pipe on the side surface. A concrete body frame with holes and
A second through hole corresponding to the first through hole and a concrete inspection frame having an inspection port on the upper surface and being connected to the main body frame are provided.
The water stop unit
An inflow tank fitted in the fitting groove and into which water flows in,
A first drainage port provided at the lower part of the inflow tank and at a position corresponding to the first through hole,
A water storage tank that is fitted into the fitting groove adjacent to the inflow tank and is deeper than the inflow tank.
A communication port that communicates the inflow tank and the water storage tank,
A second drainage port provided at the lower part of the water tank and at a position corresponding to the first through hole,
A water stop plate that obtains buoyancy by the water accumulated in the water tank when water that is housed in the water tank and exceeds the drainage amount of the first drain port and the second drain port flows in.
A packing that maintains watertightness between the water tank and the water stop plate,
Is characterized by

According to the water blocking device of the present invention, the first through hole is provided on the side surface of the main body frame, and the inspection frame connected to the main body frame is provided with the second through hole corresponding to the first through hole. The first drain port and the second drain port of the water stop device are exposed on the inspection frame side by the holes and the second through holes, so that the pipe connection work and maintenance can be easily performed. In particular, even when some work is performed on the piping or the like after the water stop device is installed, the work can be performed promptly without the need to excavate the surrounding area. As for the operation of the water stop device, the inflow of water due to precipitation or the like during normal times is discharged through the first drainage port and the second drainage port. On the other hand, in the event of an abnormality such as a flood, when the drainage from the first drainage port and the second drainage port cannot catch up, water collects in the water tank, and the water stop plate that gains buoyancy rises and blocks the water. be able to. In addition, since it is surrounded by a concrete frame, it has excellent load-bearing performance.

(2) A preferable example of the water stop device of the present invention is
The inside of the inspection frame is provided with a drainage pump for pumping up water drained from at least the second drainage port of the first drainage port and the second drainage port to a rainwater channel.

According to a preferred example of the water stop device of the present invention, since the drainage pump pumps up the drainage from at least the second drainage port, the drainage from a deep position becomes possible. As a result, there are no restrictions on the depth of the water stop device and the height of the water stop plate.

(3) A preferable example of the water stop device of the present invention is
A third drainage port provided at a position corresponding to the first through hole of the water storage tank at a water level at which the water stop plate does not rise and at a height at which drainage can be performed in the rainwater channel.
A power failure guarantee unit that stops drainage from the third drainage port during power transmission and does not interfere with drainage from the third drainage port during a power outage.
It is characterized by having.

According to a preferred example of the water stop device of the present invention, since the third drain port and the power failure guarantee unit are provided, the drainage pump can be used for drainage during power transmission, and the water can be drained through the third drain port during power failure.

(4) A preferable example of the water stop device of the present invention is
A water supply pipe that arbitrarily allows water to flow into the inflow tank or the position corresponding to the first through hole of the water storage tank, and a drainage stop mechanism that temporarily stops the drainage of the first drainage port and the second drainage port. It is characterized by being prepared.

According to a preferred example of the water stop device of the present invention, since the water supply pipe and the drainage stop mechanism are provided, water can be stored in the water tank regardless of the presence or absence of precipitation, and it is easy to check the operation at the time of installation or after maintenance. Can be.

(5) A preferable example of the water stop device of the present invention is
The packing has a cross-section hat shape in which a straight portion of the D-shaped cross section is extended as a bottom portion, and the bottom portion is configured to be harder than other portions, and a pair of metal fittings having an L-shaped cross section for fixing the packing are provided. The packing is provided upside down so as to face the side surface of the water storage tank, and the bottom portion is inserted and fixed between the packing fastening and the side surface of the water storage tank.

According to a preferred example of the water stop device of the present invention, the packing can be attached by inserting the extended bottom portion of the packing having a hat-like cross section into the packing clasp, and the packing can be attached at the time of manufacturing and maintenance of the water stop device. It is possible to reduce the work man-hours for packing replacement. Further, since the bottom of the packing is made harder than the other parts of the packing, it is possible to prevent the packing from coming off from the packing fastener.

(6) A preferable example of the water stop device of the present invention is
The main body frame is divided into a central frame provided with the first through hole and an end frame connected to an end portion of the central frame in the longitudinal direction.

According to a preferred example of the water stop device of the present invention, since the main body frame is divided, even if the frontage of the passage or the like is wide and the water stop device is long, the water stop device can be easily carried in and installed.

(7) A preferable example of the water stop device of the present invention is
The fitting groove is configured to become narrower toward the bottom.

According to a preferred example of the water stop device of the present invention, since the fitting groove becomes narrower toward the bottom, the water stop unit can be easily attached to and detached from the main body frame.

(8) The method of installing the water stop device of the present invention is as follows.
This is the method of installing the water stop device described above.
The frame installation process for installing the main body frame and the inspection frame manufactured in advance at the factory,
The process of mounting the water stop unit, which is manufactured in advance at the factory, on the main body frame, and the process of mounting the water stop unit.
The piping work process that performs the necessary piping work inside the inspection frame, and
It is characterized by including.

According to the installation method of the water stop device of the present invention, the main body frame and the inspection frame manufactured in advance at the factory are installed, and the water stop unit manufactured in advance at the factory is attached to the main body frame. The working time can be significantly reduced.

(9) The method for removing the water stop device of the present invention is as follows.
This is the method for removing the water stop device described above.
The piping removal process for removing the piping inside the inspection frame and
The process of removing the water stop unit from the main body frame and the process of removing the water stop unit,
A lid installation step of covering the opening of the main body frame and
Characterized by including

According to the method for removing the water stop device of the water stop device of the present invention, the main body frame and the inspection frame are made of concrete, so that the strength is excellent. For this reason, it is not necessary to dig up the ground or the like to remove the main body frame and the inspection frame, or to fill the inside of the main body frame and the inspection frame with soil, and the removal work is completed by closing the lid. In addition, since the main body frame and inspection frame remain in the place where it was once removed, when trying to install the water stop device again, simply remove the lid, attach the water stop unit to the main frame, and perform piping work, etc. It's enough.

As described above, according to the method of installing and removing the water stop device and the water stop device of the present invention, connecting the inspection frame provided with the inspection port to the main body frame facilitates the pipe connection work and maintenance. .. In addition, the installation and removal methods of the water stop device facilitate installation and removal.

It is a figure explaining the concrete frame of the water stop device of this invention. It is a figure which shows typically the state which attached the water stop unit and the like to the cross-sectional view taken along line AA of FIG. It is not necessary to explain packing and packing fastening.

Hereinafter, embodiments of the water blocking device 1 of the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, the water stop device 1 of the present embodiment includes a concrete frame 10, a water stop unit 40, and a drainage pump 70. The concrete frame 10 includes a main body frame 20 and an inspection frame 30.

The main body frame 20 is made of concrete and is embedded so as to cross a frontage or a passage such as a ground or a floor surface, and includes an opening 21, a fitting groove 22, and a first through hole 23. The opening 21 is provided on the upper surface of the main body frame 20. The fitting groove 22 is provided downward from the opening 21 and has a substantially inverted L shape in cross-sectional view. The water blocking unit 40 is fitted in the fitting groove 22. Further, the opening 21 of the fitting groove 22 is formed to be the widest by making the side surface 63 slanted, and the fitting groove 22 becomes narrower toward the bottom 28. The first through hole 23 is provided on the side surface of the main body frame 20 so as to communicate with the fitting groove 22, and the operator performs the work of connecting the pipe to the water stop unit 40, maintenance, and the like. Further, a connection hole 24 for connecting to the first drainage port 71 (details will be described later) is provided on the upper surface of the first through hole 23. Instead of the connection hole 24, a part of the upper surface of the first through hole 23 can be removed. Further, in the water stop device 1 of the present embodiment, the concrete frame 10 bears the main skeleton for supporting the entire device and withstanding the load of a vehicle or the like passing over the device. Therefore, the load bearing performance is excellent.

In the water stop device 1 of the present embodiment, the main body frame 20 is divided into three parts, a central frame 26 and a pair of end frames 27a and 27b connected to both sides of the central frame 26 in the longitudinal direction. This is to facilitate the manufacture and transportation of the main body frame 20. Therefore, various things such as two divisions, four divisions, and five divisions can be used depending on the dimensions of the main body frame 20 in the longitudinal direction. Further, in the two divisions, a plate (not shown) can be attached to one side of the main body frame 20 to serve as the end of the fitting groove 22 of the main body frame 20. It is preferable that the central frame 26 and the end frames 27a and 27b are connected by bolts or the like (not shown), and a packing for waterproofing is arranged or caulking or the like is provided at the connected place (main body frame). The same applies to the connection between 20 and the inspection frame 30). Further, a bolt 25 or a hole for the bolt is provided around the opening 21 on the upper surface of the main body frame 20, and the water blocking unit 40 can be fixed after being mounted. For the bolt 25 for fixing the water stop unit 40, for example, a bolt 25 having a special head shape can be adopted to prevent the water stop unit 40 from being stolen.

The inspection frame 30 is made of concrete and is connected to the side surface of the main body frame 20, and includes a lower frame 31, a second through hole 32, a top plate 33, an inspection port 34, and an inspection lid 35. The lower frame 31 has a box shape, and a drainage pump 70, piping, and the like are housed inside the lower frame 31. The second through hole 32 is a hole provided on the side surface of the lower frame 31 so as to correspond to the first through hole 23 of the main body frame 20. The top plate 33 covers the open upper surface of the lower frame 31, and has sufficient load-bearing performance for vehicles and the like passing over the top plate 33. The inspection port 34 is provided in a part of the top plate 33, and the inspection lid 35 is normally closed, and an operator enters and exits from the inspection port 34 during maintenance or the like. The top plate 33 itself can be used as a substitute for the inspection port 34.

The water stop unit 40 includes an inflow tank 41, a water storage tank 43, a water stop plate 50, and a packing 60. The inflow tank 41 is provided on the outdoor side of the water stop unit 40 or on the side where water comes in the event of a flood, and is a relatively shallow tank. A groove lid 42 such as a grating 42 is provided on the upper surface of the inflow tank 41 so that water or the like can pass therethrough. Further, a first drain port 71 for draining the water flowing into the inflow tank 41 is provided in the lower part of the inflow tank 41, and the first drain pipe 72 is connected via the connection hole 24 of the main body frame 20. .. Further, the inflow tank 41 is provided with a communication port 44 that communicates with the water storage tank 43. The communication port 44 is provided at a position about 3 to 10 cm higher than the bottom of the inflow tank 41, and the water flowing in during normal rainfall is drained through the first drain port 71 so that the water does not go to the water storage tank 43. ing. On the other hand, when water exceeding the amount of drainage from the first drainage port 71 flows into the inflow tank 41 due to heavy rain or the like, the water level in the inflow tank 41 rises, and water flows from the inflow tank 41 toward the water storage tank 43 through the communication port 44. It is configured to flow in. The width w1 of the bottom portion of the inflow tank 41 is substantially the same as the width of the fitting groove 22 of the main body frame 20 of the portion, and the bottom portion of the inflow tank 41 is fixed so as to be sandwiched between the fitting grooves 22.

The water storage tank 43 is fitted in the fitting groove 22 adjacent to the inflow tank 41, and is deeper than the inflow tank 41. Further, a second drainage port 73 is provided at a position corresponding to the first through hole 23 at the lower part of the water storage tank 43, and the second drainage pipe 74 is connected to the second drainage port 73. The water flowing into the water storage tank 43 is drained through the second drain port 73. Here, when water exceeding the amount of drainage of the first drainage port 71 and the second drainage port 73 flows into the inflow tank 41 and the water storage tank 43 due to heavy rain or the like, water accumulates inside the water storage tank 43 to obtain buoyancy. The water plate 50 is raised. The width w2 of the bottom portion of the water storage tank 43 is configured to have substantially the same width as the bottom portion 28 of the fitting groove 22 of the main body frame 20, and the bottom portion of the water storage tank 43 is fixed so as to be sandwiched between the fitting grooves 22. Further, the bottom of the water storage tank 43 is located deeper than the rainwater channel 83, and the water storage tank 43 is configured deeper than the rainwater channel 83. A pillar 45 for reinforcement is appropriately provided between the inflow tank 41 and the water storage tank 43.

Further, the water storage tank 43 is provided with a third drain port 76. This is to prevent the drainage pump 70 from stopping and water from accumulating in the water storage tank 43 in the event of a power failure, causing the water stop plate 50 to float. The third drain port 76 is provided at a position corresponding to the first through hole 23 of the water storage tank 43 at a water level at which the water stop plate 50 does not rise and at a height at which drainage can be performed in the rainwater channel 83. A third drainage pipe 77 is connected to the third drainage port 76 and extends to the rainwater channel 83. Further, the third drain pipe 77 is provided with a power failure guarantee unit 78 that is closed at the time of power transmission to stop the drainage from the third drain port 76 and is opened at the time of a power failure to prevent the drainage from the third drain port 76 from being hindered. As the power failure guarantee unit 78, a valve using a solenoid valve is used. As a result, even if the drainage pump 70 does not operate in the event of a power failure, water is drained from the third drainage port 76 in normal precipitation while having a water tank 43 configured deeper in the ground than the rainwater channel 83, and a water stop plate is provided. 50 never floats. The third drainage port 76, the third drainage pipe 77, and the power failure guarantee unit 78 are not limited to the mode in which the concrete frame 10 is used as in the water stop device 1 of the present embodiment, and other stops provided with a drainage pump. Of course, it can also be applied to water equipment.

Further, a water supply pipe 81 is connected to the inflow tank 41 or the water storage tank 43. The water supply pipe 81 is provided at a position corresponding to the first through hole 23 of the inflow tank 41 or the water storage tank 43, and is connected to the water storage tank 43 in the present embodiment. When connecting to the inflow tank 41, a hole may be provided on the upper surface of the first through hole 23 and the connection may be made from there. The water supply pipe 81 is provided with a water supply valve 82, and the operator can arbitrarily select whether or not to supply water.

Further, a drainage stop mechanism 75 for temporarily stopping drainage from the first drainage port 71 and the second drainage port 73 is provided. In the present embodiment, the drainage stop valve 75 is provided downstream of the confluence of the first drainage pipe 72 and the second drainage pipe 74, but the drainage pump 70 is forcibly stopped depending on the mode of the drainage pump 70 and the drainage tank 84. Etc. may be used. With these water supply pipes 81 and the drainage stop mechanism 75, water can be forcibly stored in the water storage tank 43 and the inflow tank 41, and the operation of the water stop device 1 can be easily confirmed. It is also possible to automatically operate the drainage stop valve in the event of a power failure to prevent water from flowing to the drainage pump 70.

Further, a packing 60 for maintaining watertightness with the water stop plate 50 is provided on the upper part of the water storage tank 43. As shown in FIG. 3, the packing 60 has a cross-sectional hat shape in which a straight portion of the D-shaped cross section serves as a bottom portion 61 and is stretched, and the bottom portion 61 is configured to be harder than the other portions. Further, the packing 60 is fixed to the packing fastening 62. The packing fastening 62 is attached to the side surface 63 of the water tank 43 so that a pair of shaped steels having an L-shaped cross section face each other upside down, and the bottom portion 61 of the packing 60 is inserted between the side surface 63 of the water storage tank 43 and the shaped steel. And fixed.

Returning to FIGS. 1 and 2, the water stop plate 50 is buoyant by the water accumulated in the water tank 43 when the water exceeding the drainage amount of the first drain port 71 and the second drain port 73 flows into the water tank 43. To get. A water stop plate 51 is provided on the upper part of the water stop plate 50 so as not to obstruct the passage of vehicles, people, etc. in normal times. Further, when the water stop plate 50 is raised, the water stop plate 50 is supported by guide portions 52 provided at both ends in the longitudinal direction of the water storage tank 43 so as not to fall.

The drainage pump 70 is provided inside the inspection frame 30 and pumps up the drainage from the first drainage port 71 and the second drainage port 73 collected in the drainage tank 84 to the rainwater channel 83. As a result, the water flowing into the water stop unit 40 can be drained to the rainwater channel 83 installed at a relatively shallow position instead of the drainage pipe installed at a relatively deep position. It is preferable that the check valve 80 is provided in the secondary side pipe 79 of the drainage pump 70. When the depth of the first drainage port 71 is such that it can flow into the rainwater channel 83, the first drainage pipe 72 from the first drainage port 71 is a second drainage pipe like the water stop device 1 of the present embodiment. It may be arranged directly to the rainwater channel 83 without merging with 74.

Next, an installation method and a removal method of the water stop device will be described based on the configuration of the water stop device 1 of the present embodiment described above.
First, the installation method will be described. The method of installing the water stop device of the present embodiment includes a frame installation step, a water stop unit mounting step, and a piping work step. In the frame installation process, the ground or floor surface is dug down, and the main body frame 20 and the inspection frame 30 manufactured in advance at the factory are installed at the site. Next, as a water stop unit mounting step, the water stop unit manufactured in advance at the factory is mounted in the fitting groove 22 of the main body frame 20. Here, the fitting groove 22 has a wide opening 21 and is configured to be narrower toward the bottom 28, and the width of the bottom 28 is substantially the same as the width of the bottom of the water tank 43. This facilitates mounting of the water blocking unit 40 in the fitting groove 22, and does not wobble even if the bottom of the water storage tank 43 is not particularly fixed after mounting. Next, the upper portion of the water blocking unit 40 and the upper surface of the main body frame 20 are connected with bolts 25 or the like. Next, the drainage pump 70 is installed inside the inspection frame 30. Next, as a piping work process, necessary piping is connected to the first drain port 71, the second drain port 73, the third drain port 76, etc. of the water stop unit 40, and the piping is connected to the drain pump 70. The water supply pipe 81 is also connected to the water storage tank 43. Further, the necessary electrical wiring is performed, the operation is confirmed, and the top plate 33 and the inspection port 34 of the inspection frame 30 may be closed. The top plate 33 may be placed at any time after the drainage pump 70 is installed.

Next, the removal method will be described. The method for removing the water stop device of the present embodiment includes a pipe removal step, a water stop unit extraction step, and a lid installation step. In the pipe removal step, the inspection port 34 of the inspection frame 30 and the top plate 33 are removed, and the pipes, electrical wiring, and the like are removed and removed or sealed. The drainage pump 70 is also removed. Next, as a step of pulling out the water stop unit, the bolt 25 or the like connecting the water stop unit 40 and the main body frame 20 is removed, and the water stop unit 40 is pulled up and pulled out by a crane or the like. At this time, since the fitting groove 22 of the main body frame 20 is widely configured as it goes to the opening 21, the water stop unit 40 and the main body frame 20 hardly come into contact with each other when the water stop unit 40 is pulled out, and the main body frame 20 can be easily removed. Can be extracted. Next, the top plate 33 of the inspection frame 30 and the inspection lid 35 are returned to close the inspection frame 30. Next, as a lid installation step, a lid (not shown) is installed in the opening 21 of the main body frame 20 to close the opening 21. At this time, bolts 25 or the like provided on the upper surface of the main body frame 20 can be used to fix the lid.

As described above, according to the water stop device 1 of the present embodiment, by providing the inspection frame 30 in the concrete frame 10, the work can be facilitated in installation, maintenance, and the like. Further, since the drainage pump 70 pumps up the drainage, there is no problem in drainage even if the water storage tank 43 of the water stop unit 40 is deepened. Further, since the third drainage port 76 and the power failure guarantee unit 78 are provided, drainage can be performed even in the event of a power failure even though the drainage pump 70 is provided. Further, since the packing 60 has a hat-shaped cross section and the bottom portion thereof is inserted into the packing fastening 62, the packing 60 can be easily attached. Further, since the main body frame 20 has a divided structure, a large machine is not required for transportation and installation work. Further, since the fitting groove 22 of the main body frame 20 has a wide opening 21 and is configured to be narrower toward the bottom, the contact between the water blocking unit 40 and the fitting groove 22 is made when installing and removing the water blocking unit 40. Can be minimized. Further, in order to obtain most of the load-bearing performance of the concrete frame 10, it is possible to minimize the reinforcement of the pillars 45 and the like of the water blocking unit 40, thereby reducing the manufacturing cost and improving the load-bearing performance. Can be made to.

Further, according to the installation method of the water stop device 1 of the present embodiment, the concrete frame 10 and the water stop unit 40 manufactured in advance at the factory may be installed at the site, and the construction period can be shortened. Further, according to the method of removing the water stop device 1 of the present embodiment, since the concrete frame 10 is left as it is, the construction period can be shortened and the water stop device 1 can be easily installed again.

The above-mentioned installation method and removal method of the water stop device 1 and the water stop device 1 are examples of the present invention, and the configuration thereof can be appropriately changed as long as the gist of the invention is not deviated.

1. Water stop device,
10 ... Concrete frame,
20 ... body frame, 21 ... opening, 22 ... fitting groove, 23 ... first through hole, 24 ... connection hole, 25 ... bolt, 26 ... center frame, 27a, 27b ... end Frame, 28 ... Bottom (fitting groove)
30 ... Inspection frame, 31 ... Lower frame, 32 ... Second through hole, 33 ... Top plate, 34 ... Inspection port, 35 ... Inspection lid,
40 ... Water stop unit, 41 ... Inflow tank, 42 ... Groove lid (grating), 43 ... Water storage tank, 44 ... Communication port, 45 ... Pillar,
50 ... Water stop plate, 51 ... Water stop plate, 52 ... Guide part,
60 ... packing, 61 ... bottom (packing), 62 ... packing fastening, 63 ... side,
70 ... Drainage pump, 71 ... 1st drainage port, 72 ... 1st drainage pipe, 73 ... 2nd drainage port, 74 ... 2nd drainage pipe, 75 ... Drainage stop mechanism (drainage stop valve), 76 ... 3rd drainage port, 77 ... 3rd drainage pipe, 78 ... Power failure guarantee part, 79 ... Secondary side piping, 80 ... Check valve, 81 ... Water supply pipe, 82 ... Water supply valve, 83 ... Rainwater channel, 84 ... Drainage tank,

Claims (9)

A water stop device that is buried in the ground or floor and gains buoyancy by the water flowing into the device, and the water stop plate rises to block the water.
The water stop device includes a concrete frame and a water stop unit.
The concrete frame
It is buried in the ground or floor, and has an opening on the upper surface, a fitting groove provided downward from the opening, and a first penetration for connecting the fitting groove and the connecting pipe and passing the pipe on the side surface. A concrete body frame with holes and
A second through hole corresponding to the first through hole and a concrete inspection frame having an inspection port on the upper surface and being connected to the main body frame are provided.
The water stop unit
An inflow tank fitted in the fitting groove and into which water flows in,
A first drainage port provided at the lower part of the inflow tank and at a position corresponding to the first through hole,
A water storage tank that is fitted into the fitting groove adjacent to the inflow tank and is deeper than the inflow tank.
A communication port that communicates the inflow tank and the water storage tank,
A second drainage port provided at the lower part of the water tank and at a position corresponding to the first through hole,
A water stop plate that obtains buoyancy by the water accumulated in the water tank when water that is housed in the water tank and exceeds the drainage amount of the first drain port and the second drain port flows in.
A packing that maintains watertightness between the water tank and the water stop plate,
A water stop device characterized by being provided with. The first aspect of the inspection frame is provided with a drainage pump for pumping up water drained from at least the second drainage port of the first drainage port and the second drainage port to a rainwater channel. The water stop device described in. A third drainage port provided at a position corresponding to the first through hole of the water storage tank at a water level at which the water stop plate does not rise and at a height at which drainage can be performed in the rainwater channel.
A power failure guarantee unit that stops drainage from the third drainage port during power transmission and does not interfere with drainage from the third drainage port during a power outage.
The water stop device according to claim 2, wherein the water stop device is provided. A water supply pipe that arbitrarily allows water to flow into the inflow tank or the position corresponding to the first through hole of the water storage tank, and a drainage stop mechanism that temporarily stops the drainage of the first drainage port and the second drainage port. The water blocking device according to any one of claims 1 to 3, further comprising. The packing has a cross-section hat shape in which a straight portion of the D-shaped cross section is extended as a bottom portion, and the bottom portion is configured to be harder than other portions, and a pair of metal fittings having an L-shaped cross section for fixing the packing are provided. Claims 1 to 4 are provided as a packing stopper upside down so as to face the side surface of the water storage tank, and the bottom portion is inserted and fixed between the packing stopper and the side surface of the water storage tank. The water stop device according to any one of the above items. One of claims 1 to 5, wherein the main body frame is divided into a central frame provided with the first through hole and an end frame connected to an end portion of the central frame in the longitudinal direction. The water blocking device according to item 1. The water blocking device according to any one of claims 1 to 6, wherein the fitting groove is configured to become narrower toward the bottom. The method for installing a water stop device according to any one of claims 1 to 7.
The frame installation process for installing the main body frame and the inspection frame manufactured in advance at the factory,
The process of mounting the water stop unit, which is manufactured in advance at the factory, on the main body frame, and the process of mounting the water stop unit.
The piping work process that performs the necessary piping work inside the inspection frame, and
A method of installing a water stop device, which comprises. The method for removing the water stop device according to any one of claims 1 to 7.
The piping removal process for removing the piping inside the inspection frame and
The process of removing the water stop unit from the main body frame and the process of removing the water stop unit,
A lid installation step of covering the opening of the main body frame and
A method of removing a water stop device, which comprises.

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