JP6768596B2 - Maintenance method and intake / discharge port in the intake / discharge tunnel - Google Patents

Description

The present invention relates to a maintenance method and an intake / discharge port in an intake / discharge tunnel connected below an intake / discharge port having a top plate, a bottom plate, and a side wall.

Conventionally, in the cooling water equipment of power plants and plant facilities, intake and discharge ports have been installed as far offshore as possible so as not to affect the ecosystem in the sea area, and these and the equipment in the land area are connected to the ground on the seabed. Increasingly, they are connected to each other via an undersea tunnel provided inside (see, for example, Patent Documents 1 and 2).

When such a deep water intake / discharge system is adopted, a long underwater tunnel from the land area to the sea area is used as the intake / discharge channel tunnel. As a maintenance method for the underwater tunnel, a method of performing underwater work by a diver or an underwater robot, or an intermediate shaft having a damming structure such as corner dropping is provided on the land part, and the work is performed by drying up the land side from the intermediate shaft. There was a way to do it.

Japanese Patent No. 3918605 Japanese Patent No. 4807930

However, when a diver performs maintenance of a long underwater tunnel from land to sea, it requires a long time of underwater work, which is dangerous. In addition, when an underwater robot is used, a large amount of waste generated by maintenance cannot be carried out of the tunnel because the carrying capacity of the robot is limited. With the method using an intermediate shaft, dry-up can be performed only on the land side.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to easily inspect and repair the entire intake / discharge tunnel in a dry state. It is to provide the maintenance method and the intake and discharge port inside.

The first invention for achieving the above-mentioned object is a maintenance method in an intake / discharge channel tunnel connected below an intake / discharge port having a top plate, a bottom plate, and a side wall, and is provided on the top plate. The step a of removing the lid installed in the top slab opening and the lid are installed in the bottom slab opening provided in the bottom slab so as to communicate with the intake / discharge tunnel to close the bottom slab opening. A step b, a step c of draining water from the inside of the intake / discharge tunnel while supplying air from the air supply / exhaust port provided on the lid, and a step d of performing maintenance inside the intake / discharge tunnel. It is a maintenance method in an intake / discharge tunnel, which is characterized by being equipped.

In the first invention, a lid is installed in the bottom slab opening to close the bottom slab opening, and then the inside of the intake / discharge tunnel is drained so that the intake / discharge tunnel and the intake / discharge port communicate with each other. It is possible to stop water and dry up the entire intake / discharge tunnel, and to easily inspect and repair the entire intake / discharge tunnel. Further, since the top plate lid of the top plate opening and the water stop lid of the bottom plate opening are also used, it is not necessary to transport the water stop lid from land or store it on land.

A second invention is a maintenance method in an intake / discharge tunnel connected below an intake / discharge port having a top slab, a bottom slab, and a side wall, wherein the lid is communicated with the intake / discharge tunnel. A step b of closing the bottom slab opening by installing it in the bottom slab opening provided in the bottom slab, and a step of draining water from the inside of the intake / discharge tunnel while supplying air from the air supply / exhaust port provided in the lid. c, a step d of performing maintenance inside the intake / discharge tunnel, a step e of injecting water into the inside of the intake / discharge tunnel while exhausting from the air supply / exhaust port provided on the lid, and the bottom slab opening. A release step f for removing the lid from the above, and a step g for installing the lid in the top plate opening provided in the top plate and closing the top plate opening. This is a maintenance method inside the waterway tunnel.

In the second invention, the lid is installed in the bottom slab opening to close the bottom slab opening, and then the inside of the intake / discharge tunnel is drained so that the intake / discharge tunnel and the intake / discharge port communicate with each other. It is possible to stop water and dry up the entire intake / discharge tunnel, and to easily inspect and repair the entire intake / discharge tunnel. Further, since the top plate lid of the top plate opening and the water stop lid of the bottom plate opening are also used, it is not necessary to transport the water stop lid on land or store it on land.

In the first and second inventions, it is desirable that an air supply / exhaust valve and an air supply / exhaust pipe are installed at the air supply / exhaust port.
Thereby, in the step c of draining the inside of the intake / discharge tunnel and the step e of injecting water into the inside of the intake / discharge tunnel, the state of air supply and exhaust through the air supply / exhaust port can be easily controlled.

In the first and second inventions, for example, a first convex portion is provided on the inner peripheral surface of the top plate opening, and the first convex portion is overlapped and joined to the outer peripheral surface of the lid. The second convex portion is provided, and the lid is taken in and out from the water intake / discharge port through the notch provided in the first convex portion.
By passing the second convex portion provided on the lid through the notch portion of the first convex portion provided on the top plate, the lid can be easily taken in and out from the water discharge port through the top plate opening. Can be done.

A third invention is an intake / discharge port connected above an intake / discharge tunnel, and includes a top slab having a top slab opening, a bottom slab having a bottom slab opening communicating with the intake / discharge tunnel, and the like. A side wall provided between the top slab and the bottom slab, and a lid that can be replaced with the top slab opening and the bottom slab opening are provided, and a first surface is formed on the inner peripheral surface of the top slab opening. The convex portion is provided, and the outer peripheral surface of the lid is provided with a second convex portion for overlapping and joining with the first convex portion, and a notch portion provided in the first convex portion. The water intake / discharge port is characterized in that the lid can be taken in and out from the water intake / discharge port through the top plate opening.

In the water intake / discharge port of the third invention, a lid that can be replaced with the top plate opening and the bottom plate opening is used, and the top plate lid of the top plate opening and the water stop lid of the bottom plate opening are also used. There is no need to transport the water stop lid on land or store it on land. Further, by passing the second convex portion provided on the lid through the notch portion of the first convex portion provided on the top plate, the lid can be easily taken in and out from the water discharge port through the top plate opening. can do.

A fourth invention is an intake / discharge port connected above an intake / discharge tunnel, and includes a top slab having a top slab opening, a bottom slab having a bottom slab opening communicating with the intake / discharge tunnel, and the like. A side wall provided between the top plate and the bottom plate, a lid that can be replaced with the top plate opening and the bottom plate opening, and a first surface on the inner peripheral surface of the top plate opening. A second convex portion for overlapping and joining the first convex portion is provided on the outer peripheral surface of the lid, and the top plate opening and the lid are elliptical. The water intake / discharge port is characterized in that the lid can be taken in and out from the water intake / discharge port through the top plate opening by tilting and rotating the lid.

In the water intake / discharge port of the fourth invention, a lid that can be replaced with the top plate opening and the bottom plate opening is used, and the top plate lid of the top plate opening and the water stop lid of the bottom plate opening are also used. There is no need to transport the water stop lid on land or store it on land. Further, by making the lid and the top plate opening oval and tilting and rotating the lid, the lid can be easily taken in and out from the water discharge port through the top plate opening.

A fifth invention is an intake / discharge port connected above an intake / discharge tunnel, and has a top slab having a top slab opening, a bottom slab having a bottom slab opening communicating with the intake / discharge tunnel, and the top. A side wall provided between the plate and the bottom plate, and a lid that can be replaced with the top plate opening and the bottom plate opening are provided, and the lid and the lid are provided on the inner peripheral surface of the top plate opening. An annular jig having a brim-shaped portion for superimposing and joining is provided, and by opening a part of the brim-shaped portion by a hinge structure, the lid is opened through the top plate opening. It is a water intake / discharge port that can be taken in and out of the tunnel.

In the water intake / discharge port of the fifth invention, a lid that can be replaced with the top plate opening and the bottom plate opening is used, and the top plate lid of the top plate opening and the water stop lid of the bottom plate opening are also used. There is no need to transport the water stop lid on land or store it on land. Further, by opening a part of the brim-shaped portion of the annular jig provided on the inner peripheral surface of the top plate opening, the lid can be easily taken in and out from the water discharge port through the top plate opening. ..

In the third, fourth, and fifth inventions, it is desirable that the lid is provided with an air supply / exhaust port, and the air supply / exhaust valve and the air supply / exhaust pipe are installed at the air supply / exhaust port.
As a result, the state of air supply and exhaust through the air supply / exhaust port can be easily controlled.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a maintenance method and an intake / discharge port in an intake / discharge channel tunnel which can easily perform inspection and repair of the entire intake / discharge channel tunnel in a dry-up state.

The figure which shows each process for performing maintenance of a drainage tunnel 21 The figure which shows the structure of the outlet 1. The figure which shows the method of replacing the lid 11 in a water discharge port 1. The figure which shows the structure of the outlet 1a The figure which shows the method of replacing the lid 11a in a water discharge port 1a The figure which shows the method of replacing the lid 11b in the outlet 1b. The figure which shows the method of replacing the lid 11c in the outlet 1c The figure which shows the example of the drainage tunnel 21 which has a drainage port 1d.

Hereinafter, the first embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing each process for performing maintenance of the drainage tunnel 21. FIG. 1A is a diagram showing a state in which the outlet 1 and the drainage tunnel 21 are used, and FIG. 1B is a diagram showing a state in which water is drained from the drainage tunnel 21. c) is a diagram showing a state in which the drainage tunnel 21 is dried up, and FIG. 1 (d) is a diagram showing a state in which water is injected into the drainage tunnel 21.

FIG. 2 is a diagram showing the structure of the water discharge port 1. FIG. 2A is a view of the water discharge port 1 without the lid 11 as viewed from above. FIG. 2B is a cross-sectional perspective view of the water discharge port 1 in which the lid 11 is not installed, and is a view showing a cross section taken along the line EE of FIG. 2A. FIG. 2C is a perspective view of the lid 11. FIG. 2D is a plan view of the notch cap 67.

FIG. 3 is a diagram showing a method of replacing the lid 11 at the water discharge port 1. 3 (a) and 3 (b) are views showing a state in which the lid 11 is fixed to the top plate 3. The upper part of FIG. 3B is a diagram showing a cross section taken along the arrow F1-F1 of FIG. 3A, and the lower part is a diagram showing a cross section taken along the arrow F2-F2 of FIG. 3A. 3 (c) and 3 (d) are views showing a state in which the lid 11 is released from being fixed to the top plate 3. The upper part of FIG. 3D is a diagram showing a cross section taken along the arrow F3-F3 of FIG. 3C, and the lower part is a diagram showing a cross section taken along the arrow F4-F4 of FIG. 3C. 3 (e) and 3 (f) are views showing a state in which the lid 11 is fixed to the bottom plate 5. 3 (e) is a diagram showing a cross section taken along the arrow F6-F6 of FIG. 3 (f), and FIG. 3 (f) is a diagram showing a cross section taken along the arrow F5-F5 of FIG. 3 (e).

(Structure of outlet 1 and outlet tunnel 21)
As shown in FIG. 1, the water discharge port 1 has a top plate 3 having a top plate opening 29, a bottom plate 5 having a bottom plate opening 31, and a tubular side wall 7 provided between the top plate 3 and the bottom plate 5. It is composed of a plurality of nozzles 9 provided on the side wall 7, a lid 11 that can be replaced with the top plate opening 29 and the bottom plate opening 31 and the like. The top plate opening 29, the bottom plate opening 31, and the lid 11 are circular. The outlet 1 is installed on the bottom 23 of the water.

As shown in FIG. 1A, the drainage tunnel 21 is buried in the ground 25 of the water bottom 23, and the opening at the upper end is located at the water bottom 23. The drainage tunnel 21 is provided with a cylindrical bracket 19 on the outer peripheral surface near the upper end. The bracket 19 supports the lower surface 4 of the bottom plate 5 of the water discharge port 1 on the upper surface 69. The bottom slab opening 31 of the bottom slab 5 communicates with the drainage tunnel 21.

As shown in FIG. 1 (b), the top plate 3 is provided with a first convex portion 35 on the inner peripheral surface 33 of the top plate opening 29. As shown in FIG. 2A, the convex portion 35 is provided with notches 43 at predetermined intervals in the circumferential direction of the top plate opening 29. As shown in FIG. 2B, the convex portion 35 is provided only on the lower half portion 39 of the thickness 37 of the top plate 3. The convex portion 35 is provided with a hole 41 in the vertical direction.

As shown in FIG. 1A, the bottom slab 5 is provided with a convex portion 47 on the inner peripheral surface 45 of the bottom slab opening 31. As shown in FIG. 2B, the convex portion 47 is provided only on the lower half portion 53 of the bottom plate 5 having a thickness of 51. The convex portion 47 is provided with a hole 49 in the vertical direction. The bracket 19 that supports the lower surface 4 of the bottom plate 5 is provided with a ring-shaped water blocking material 71 made of rubber or the like on the upper surface 69.

As shown in FIG. 2C, the lid 11 is provided with a second convex portion 57 on the outer peripheral surface 55 for overlapping and joining the first convex portion 35 provided on the top plate 3. The convex portion 57 is provided with cutout portions 63 at predetermined intervals in the circumferential direction of the lid 11. The convex portion 57 is provided only on the upper half portion 61 of the thickness 59 of the lid 11. The convex portion 57 is provided with a hole 65 in the vertical direction.

As shown in FIGS. 1 and 2 (c), the lid 11 is provided with an air supply / exhaust port 13 near the center. An air supply / exhaust pipe 15 is attached to the air supply / exhaust port 13. The air supply / exhaust pipe 15 is provided with an air supply / exhaust valve 17.

The diameter 14 of the lid 11 including the convex portion 57 shown in FIG. 2 (c) is slightly smaller than the diameter 28 of the inner peripheral surface 33 of the top plate opening 29 of the top plate 3 shown in FIG. 2 (a). However, they are almost the same. The unevenness formed by the convex portion 57 and the notch 63 provided on the outer peripheral surface 55 of the lid 11 shown in FIG. 2 (c), and the top plate opening 29 of the top plate 3 shown in FIG. 2 (a). The unevenness formed by the convex portion 35 and the notch portion 43 provided on the inner peripheral surface 33 has a structure of fitting each other. The convex portion 57 provided on the lid 11 has a size so as to pass through the notch 43 provided on the top plate 3, and the convex portion 35 provided on the top plate 3 has a notch 63 provided on the lid 11. It is large enough to pass through.

As shown in FIG. 2D, the notch cap 67 is composed of the same number of members as the number of notches 63 of the lid 11. The notch cap 67 has a shape corresponding to the notch 63 of the lid 11. The notch cap 67 is made of rubber or the like.

(How to replace the lid 11 at the water outlet 1)
When closing the top plate opening 29 of the top plate 3 of the water discharge port 1 with the lid 11, as shown in the upper diagram of FIG. 3 (b), above the first convex portion 35 provided on the top plate 3. The second convex portion 57 provided on the lid 11 is overlapped with the lid 11. Then, as shown in FIG. 3A, the hole 65 of the convex portion 57 and the hole 41 of the convex portion 35 (FIG. 2A) are communicated with each other, the bolt 89 is inserted, and the convex portion 57 is inserted into the convex portion 35. Fix to.

When the convex portion 57 of the lid 11 is superposed on the convex portion 35 of the top plate 3, the cut provided on the convex portion 35 of the top plate 3 is provided as shown in the lower drawings of FIGS. 3 (a) and 3 (b). The notch 43 and the notch 63 provided in the convex 57 of the lid 11 communicate with each other. A notch cap 67 is installed in the notch 43 and the notch 63 that communicate with each other to close the top plate opening 29.

When replacing the lid 11 from the top plate opening 29 to the bottom plate opening 31, a bolt 89 for fixing the convex portion 57 to the convex portion 35 is provided from the state shown in FIGS. 3 (a) and 3 (b). , Removed from the communicating holes 65 and 41 (FIG. 2A). At the same time, the notch cap 67 is removed from the notch 43 and the notch 63 to secure the opening.

Then, the lid 11 is suspended by using a crane carrier or the like, the lid 11 is rotated by a predetermined angle in the direction of the arrow G shown in FIG. 3 (a), and as shown in FIG. 3 (c), the lid 11 The lid 11 is arranged so that the convex portion 57 and the convex portion 35 of the top plate 3 do not overlap. At this time, as shown in the upper view of FIG. 3D, the convex portion 35 of the top plate 3 is located below the notch portion 63 provided in the convex portion 57 of the lid 11. Further, as shown in the lower part of FIG. 3D, the convex portion 57 of the lid 11 is located above the notch portion 43 provided in the convex portion 35 of the top plate 3.

After that, the convex portion 57 of the lid 11 passes through the notch 43 provided in the convex portion 35 of the top plate 3, and the convex portion 35 of the top plate 3 passes through the notch 63 provided in the convex portion 57 of the lid 11. The lid 11 is hung from the position of the top plate opening 29 to the position of the bottom plate opening 31 so as to pass through.

When closing the bottom slab opening 31 of the bottom slab 5 of the water discharge port 1 with the lid 11, as shown in FIG. 3 (f), the convex portion provided on the lid 11 is placed on the convex portion 47 provided on the bottom slab 5. The portions 57 are overlapped. Then, as shown in FIG. 3 (e), the hole 65 of the convex portion 57 and the hole 49 of the convex portion 47 (FIG. 2 (b)) are communicated with each other, the bolt 89 is inserted, and the convex portion 57 is inserted into the convex portion 47. The bottom slab opening 31 is closed.

When the bottom slab opening 31 is closed with the lid 11, the water blocking material 71 installed on the upper surface 69 of the bracket 19 shown in FIG. 2 (b) becomes the lower surface 12 of the lid 11 and the upper surface of the bracket 19 shown in FIG. 3 (f). It is sandwiched between 69 and a water-stopping effect. The notch cap 67 shown in FIG. 2D is installed in the notch 63 provided in the convex portion 57.

When replacing the lid 11 from the bottom plate opening 31 to the top plate opening 29, bolts 89 for fixing the convex portion 57 to the convex portion 47 are provided from the states shown in FIGS. 3 (e) and 3 (f). , Removed from the communicating holes 65 and 49 (FIG. 2B). At the same time, the notch cap 67 is removed from the notch 63 to secure the opening.

Then, the lid 11 is suspended using a crane carrier or the like, and as shown in FIGS. 3 (c) and 3 (d), the convex portion 57 of the lid 11 is provided in the convex portion 35 of the top plate 3. The lid 11 is moved from the position of the bottom plate opening 31 to the position of the top plate opening 29 so that the convex portion 35 of the top plate 3 passes through the portion 43 and the notch portion 63 provided in the convex portion 57 of the lid 11. Lift up to.

After that, the lid 11 is rotated by a predetermined angle, and as shown in FIGS. 3 (a) and 3 (b), the convex portion 35 of the top plate 3 and the convex portion 57 of the lid 11 are overlapped with each other to overlap the bolt 89. In addition to fixing with, a notch cap 67 is installed in the opening including the notch 43 and the notch 63 to close the top plate opening 29.

(Maintenance method of drainage tunnel 21)
As shown in FIG. 1A, when the water discharge port 1 and the water discharge channel tunnel 21 are used, the lid 11 is installed in the top plate opening 29 of the top plate 3 of the water discharge port 1. As shown in FIGS. 3 (a) and 3 (b), the lid 11 is fixed to the top plate 3 and closes the top plate opening 29. The inside of the drainage tunnel 21 and the drainage port 1 is filled with water 27, and the water 27 is discharged from the nozzle 9 as needed.

When performing maintenance of the drainage tunnel 21, the lid 11 is replaced from the top plate opening 29 of the top plate 3 to the bottom plate opening 31 of the bottom plate by the above procedure from the state shown in FIG. 1 (a), and the bottom plate opening is opened. 31 is closed with a lid 11.

After that, as shown in FIG. 1B, the air supply / exhaust pipe 15 of the lid 11 is extended above the water surface. Then, the air supply / exhaust valve 17 is opened, and as shown by the arrow A, the onshore pump is operated while supplying air from above the water surface into the drainage tunnel 21 via the air supply / exhaust pipe 15 and the air supply / exhaust port 13. , As shown by the arrow B, the water 27 is drained from the inside of the drainage tunnel 21. When the drainage of the drainage tunnel 21 is completed, the air supply / exhaust valve 17 is closed.

When the drainage is completed and the inside of the drainage tunnel 21 is in a dry-up state as shown in FIG. 1C, the inside of the drainage tunnel 21 is maintained by aerial work.

After the maintenance is completed, the air supply / exhaust valve 17 is opened as shown in FIG. 1 (d), and as shown by the arrow C, from the inside of the drainage tunnel 21 to the water surface via the air supply / exhaust port 13 and the air supply / exhaust pipe 15. As shown by the arrow D, water 27 is injected into the inside of the tailrace tunnel 21 while exhausting the air. When the water injection into the drainage tunnel 21 is completed, the air supply / exhaust valve 17 is closed.

After the water injection is completed, the lid 11 is replaced from the bottom plate opening 31 of the bottom plate 5 to the top plate opening 29 of the top plate 3, and the top plate opening 29 is closed with the lid 11 according to the procedure described above. Return to the indicated state.

As described above, in the first embodiment, after the bottom slab opening 31 is closed by using the lid 11 that can be replaced with the top slab opening 29 and the bottom slab opening 31, the inside of the drainage tunnel 21 is drained. And perform maintenance. As a result, water can be stopped at a position where the drainage tunnel 21 and the discharge port 1 communicate with each other to dry up the entire area of the drainage tunnel 21, so that the entire area of the drainage tunnel 21 can be inspected and repaired. It can be easily done by work.

In the first embodiment, since the top plate lid of the top plate opening 29 and the water stop lid of the bottom plate opening 31 are also used by one lid 11, the water stop lid can be transported from land or stopped on land. There is no need to secure a storage place dedicated to the water lid. Further, the lid 11 can be protected from corrosion at the same time as the water discharge port 1 by the heavy corrosion protection coating or the electric corrosion protection applied to the water discharge port 1.

In the first embodiment, the notch 43 is provided in the convex portion 35 provided on the inner peripheral surface 33 of the top plate 3, and the convex portion 57 of the lid 11 is passed through the notch 43 to open the top plate. The lid 11 can be easily taken in and out of the water discharge port 1 via the portion 29.

In the first embodiment, when the lid 11 is installed in the bottom slab opening 31, the convex portion 57 and the convex portion 47 are fixed by bolts 89, and the notch cap 67 is installed in the notch 63. However, it is not essential to install the bolt 89 and the notch cap 67.

Further, when the lid 11 was replaced between the top plate opening 29 and the bottom plate opening 31, the lid 11 was hung by using a crane carrier or the like, but the lid 11 was hung by using a floater instead of the crane carrier. It may be moved up and down.

Next, a second embodiment will be described.
FIG. 4 is a diagram showing the structure of the water discharge port 1a. FIG. 4A is a view of the water discharge port 1a in which the lid 11a is not installed, as viewed from above. FIG. 4B is a cross-sectional perspective view of the water discharge port 1a in which the lid 11a is not installed, and is a view showing a cross section taken along the line GG of FIG. 4A. FIG. 4C is a plan view of the lid 11a as viewed from above. FIG. 4D is a vertical cross-sectional view of the lid 11a. FIG. 4 (e) is a plan view of the notch cap 67a.

FIG. 5 is a diagram showing a method of replacing the lid 11a at the water discharge port 1a. 5 (a) and 5 (b) are views showing a state in which the lid 11a is fixed to the top plate 3a. The upper part of FIG. 5B is a diagram showing a cross section taken along the arrow H1-H1 of FIG. 5A, and the lower part is a diagram showing a cross section taken along the arrow H2-H2 of FIG. 5A. 5 (c) and 5 (d) are views showing a state in which the lid 11a is passed through the top plate opening 29a. 5 (d) is a cross-sectional perspective view taken along the line H3-H3 of FIG. 5 (c). 5 (e) and 5 (f) are views showing a state in which the lid 11a is fixed to the bottom plate 5a. 5 (e) is a diagram showing a cross section taken along the arrow H5-H5 of FIG. 5 (f), and FIG. 5 (f) is a diagram showing a cross section taken along the arrow H4-H4 of FIG. 5 (e).

(Structure of outlet 1a and outlet tunnel 21)
As shown in FIGS. 4 and 5, the water discharge port 1a has substantially the same configuration as the water discharge port 1 of the first embodiment, but has a top plate opening 29a instead of the top plate 3. 3a is provided. Further, instead of the bottom plate 5, a bottom plate 5a having a bottom plate opening 31a is provided. Further, instead of the lid 11, a lid 11a that can be replaced with the top plate opening 29a and the bottom plate opening 31a is provided. The top plate opening 29a, the bottom plate opening 31a, and the lid 11a are circular. The outlet 1a is installed on the bottom of the water.

The drainage tunnel 21 has the same configuration as the drainage tunnel 21 of the first embodiment. As shown in FIG. 4B, the bracket 19 provided in the drainage tunnel 21 supports the lower surface 4a of the bottom plate 5a of the drainage port 1a at the upper surface 69. The bottom slab opening 31a of the bottom slab 5a communicates with the drainage tunnel 21.

As shown in FIG. 4A, the top plate 3a is provided with a first convex portion 35a on the inner peripheral surface 33a of the top plate opening 29a. The convex portion 35a is provided with two notched portions 43a. The two notches 43a are provided 180 degrees apart. The notch portion 43a is formed so that the inner peripheral surface 30 is located radially outside the inner peripheral surface 33a of the top plate opening 29a. As shown in FIG. 4B, the convex portion 35a is provided only on the lower half portion 39a of the top plate 3a having a thickness of 37a. The convex portion 35a is provided with a hole 41a in the vertical direction.

As shown in FIG. 4B, the bottom slab 5a is provided with a convex portion 47a on the inner peripheral surface 45a of the bottom slab opening 31a. The convex portion 47a is provided only on the lower half portion 53a of the bottom plate 5a having a thickness of 51a. The convex portion 47a is provided with a hole 49a in the vertical direction. The bracket 19 that supports the lower surface 4a of the bottom plate 5a is provided with a ring-shaped water blocking material 71 made of rubber or the like on the upper surface 69.

As shown in FIGS. 4 (c) and 4 (d), the lid 11a has a second convex portion for being overlapped and joined to the outer peripheral surface 55a with the first convex portion 35a provided on the top plate 3a. 57a is provided. The convex portion 57a is provided only on the upper half portion 61a of the lid 11a having a thickness of 59a. The convex portion 57a is provided with a hole 65a in the vertical direction.

Further, the lid 11a is provided with an air supply / exhaust port 13 near the center. An air supply / exhaust pipe 15 is attached to the air supply / exhaust port 13. The air supply / exhaust pipe 15 is provided with an air supply / exhaust valve 17.

The diameter 14a of the lid 11a including the convex portion 57a shown in FIG. 4D is slightly smaller than the diameter 28a of the top plate opening 29a of the top plate 3a shown in FIG. 4A, but is substantially the same. ..

As shown in FIG. 4 (e), the notch cap 67a is composed of two members. As shown in FIG. 5A, the notch cap 67a has the outer peripheral surface 56 of the convex portion 57a of the lid 11a and the inner peripheral surface of the notch 43a in a state where the lid 11a is installed in the top plate opening 29a. The shape is such that it fills the space between 30 and 30. The notch cap 67a is made of rubber or the like.

(Method of replacing the lid 11a at the water discharge port 1a)
When closing the top plate opening 29a of the top plate 3a of the water discharge port 1a with the lid 11a, as shown in the upper diagram of FIG. 5 (b), above the first convex portion 35a provided on the top plate 3a. The second convex portion 57a provided on the lid 11a is overlapped with the lid 11a. Then, as shown in FIG. 5A, the hole 65a of the convex portion 57a and the hole 41a of the convex portion 35a (FIG. 5D) are communicated with each other, the bolt 89 is inserted, and the convex portion 57a is passed through the convex portion 35a. Fix to.

When the convex portion 57a of the lid 11a is overlapped with the convex portion 35a of the top plate 3a, as shown in FIG. 5A, the notch portion 43a is provided by the notch portion 43a provided in the convex portion 35a of the top plate 3a. A gap is formed between the inner peripheral surface 30 of the lid 11a and the outer peripheral surface 56 of the convex portion 57a of the lid 11a. As shown in the lower drawings of FIGS. 5A and 5B, a notch cap 67a is installed in the gap created by the notch 43a to close the top plate opening 29a.

When replacing the lid 11 from the top plate opening 29a to the bottom plate opening 31a, bolts 89 for fixing the convex portion 57a to the convex portion 35a are provided from the states shown in FIGS. 5 (a) and 5 (b). , Removed from the communicating holes 65a and 41a (FIG. 5 (d)). At the same time, the notch cap 67a is removed from the notch 43a to secure the opening.

Then, the lid 11a is suspended by using a crane carrier or the like, the lid 11a is tilted as shown in FIGS. 5 (c) and 5 (d), and the notch portion 43a provided in the convex portion 35a of the top plate 3a is provided. Pass through. After that, the lid 11a is returned horizontally in the water discharge port 1a, and the lid 11a is suspended to the bottom slab opening 31a.

When closing the bottom slab opening 31a of the bottom slab 5a of the water discharge port 1a with the lid 11a, as shown in FIG. 5 (f), the convex portion 47a provided on the bottom slab 5a is covered with the convex provided on the lid 11a. The portions 57a are overlapped. Then, as shown in FIG. 5 (e), the hole 65a of the convex portion 57a and the hole 49a of the convex portion 47a (FIG. 5 (d)) are communicated with each other, the bolt 89 is inserted, and the convex portion 57a is passed through the convex portion 47a. The bottom slab opening 31a is closed.

When the bottom slab opening 31a is closed with the lid 11a, the water blocking material 71 installed on the upper surface 69 of the bracket 19 shown in FIG. 5 (d) becomes the lower surface 12a of the lid 11a and the upper surface of the bracket 19 shown in FIG. 5 (f). It is sandwiched between 69 and a water-stopping effect.

When the lid 11a is replaced from the bottom plate opening 31a to the top plate opening 29a, from the state shown in FIG. 5 (e), the bolt 89 for fixing the convex portion 57a to the convex portion 47a is communicated with the hole 65a and the hole 65a. Remove from hole 49a (FIG. 5 (d)).

Then, the lid 11a is suspended by using a crane carrier or the like, and as shown in FIGS. 5 (c) and 5 (d), the lid 11a is tilted and a notch portion provided in the convex portion 35a of the top plate 3a is provided. Lift it through 43a.

After that, the lid 11a is returned horizontally on the water discharge port 1a, the lid 11a is installed in the top plate opening 29a as shown in FIGS. 5 (a) and 5 (b), and the convex portion 35a of the top plate 3a is installed. The convex portion 57a of the lid 11a is overlapped and fixed with the bolt 89, and the notch cap 67a is installed in the gap created by the notch 43a to close the top plate opening 29a.

(Maintenance method of drainage tunnel 21)
When the outlet 1a and the outlet tunnel 21 are used, as shown in FIGS. 5 (a) and 5 (b), a lid 11a is provided at the top plate opening 29a of the top plate 3a of the water discharge port 1a. is set up. The lid 11a is fixed to the top plate 3a and closes the top plate opening 29a. The inside of the drainage tunnel 21 and the drainage port 1a is filled with water, and water is discharged from the nozzle 9 as needed.

When the drainage tunnel 21 is maintained, the lid 11a is changed from the top plate opening 29a of the top plate 3a to the bottom plate opening of the bottom plate 5a by the above procedure from the state shown in FIGS. 5 (a) and 5 (b). Instead of 31a, the bottom slab opening 31a is closed with the lid 11a as shown in FIGS. 5 (e) and 5 (f).

After that, in the same manner as in the first embodiment, water is drained from the inside of the drainage tunnel 21 to bring the inside of the drainage tunnel 21 into a dry-up state. Then, the inside of the drainage tunnel 21 is maintained by aerial work. After the maintenance is completed, water is injected into the inside of the tailrace tunnel 21 in the same manner as in the first embodiment.

After the water injection is completed, the lid 11a is replaced from the bottom slab opening 31a of the bottom slab 5a to the top slab opening 29a of the top slab 3a by the above procedure from the state shown in FIGS. 5 (e) and 5 (f). The top plate opening 29a is closed with the lid 11a, and the state is returned to the state shown in FIGS. 5 (a) and 5 (b).

As described above, in the second embodiment, the bottom slab opening 31a is closed by using the lid 11a that can be replaced with the top slab opening 29a and the bottom slab opening 31a, and then the inside of the drainage tunnel 21 is drained. And perform maintenance. As a result, water can be stopped at a position where the drainage tunnel 21 and the discharge port 1a communicate with each other to dry up the entire area of the drainage tunnel 21, so that the entire area of the drainage tunnel 21 can be inspected and repaired. It can be easily done by work.

Also in the second embodiment, since the top plate lid of the top plate opening 29a and the water stop lid of the bottom plate opening 31a are also used by one lid 11a, the water stop lid can be transported from land or land. There is no need to secure a storage place dedicated to the water stop lid. Further, the lid 11a can be protected from corrosion at the same time as the water discharge port 1a by the heavy corrosion protection coating or the electric corrosion protection applied to the water discharge port 1a.

In the second embodiment, the notch 43a is provided in the convex portion 35a provided on the inner peripheral surface 33a of the top plate 3a, and the lid 11a is tilted and passed through the notch 43a to pass the top plate opening 29a. The lid 11a can be easily taken in and out from the water discharge port 1a.

In the second embodiment, when the lid 11a is installed in the bottom slab opening 31a, the convex portion 57a and the convex portion 47a are fixed by the bolt 89, but the installation of the bolt 89 is not essential.

Next, a third embodiment will be described.
FIG. 6 is a diagram showing a method of replacing the lid 11b at the water discharge port 1b. FIG. 6A is a view of the water discharge port 1b without the lid 11b installed from above, and FIG. 6B is a cross-sectional perspective view of the lid 11b fixed to the top plate 3b. FIG. 6B is a cross-sectional perspective view at the position indicated by arrows J1-J1 in FIG. 6A. 6 (c) and 6 (d) are views showing a state in which the lid 11b is passed through the top plate opening 29b. FIG. 6 (d) is a diagram showing a cross section taken along the arrow J2-J2 of FIG. 6 (c). 6 (e) and 6 (f) are views showing a state in which the lid 11b is fixed to the bottom plate 5b. 6 (e) is a diagram showing a cross section taken along the arrow J4-J4 of FIG. 6 (f), and FIG. 6 (f) is a diagram showing a cross section taken along the arrow J3-J3 of FIG. 6 (e).

(Structure of outlet 1b and outlet tunnel 21)
As shown in FIG. 6, the water discharge port 1b has substantially the same configuration as the water discharge port 1 of the first embodiment, but instead of the top plate 3, a top plate 3b having a top plate opening 29b is provided. Be done. Further, instead of the bottom plate 5, a bottom plate 5b having a bottom plate opening 31b is provided. Further, instead of the lid 11, a lid 11b that can be replaced with the top plate opening 29b and the bottom plate opening 31b is provided. The top slab opening 29b, the bottom slab opening 31b, and the lid 11b are oval. The water discharge port 1b is installed on the bottom of the water in the same manner as the water discharge port 1 of the first embodiment.

The drainage tunnel 21 has substantially the same configuration as the drainage tunnel 21 of the first embodiment, but a tubular bracket 19b is provided on the outer peripheral surface near the upper end. As shown in FIG. 6B, the outer diameter of the bracket 19b is a substantially elliptical shape that matches the bottom slab opening 31b. The bracket 19b supports the lower surface 4b of the bottom plate 5b of the water discharge port 1b on the upper surface 69b. The bottom slab opening 31b of the bottom slab 5b communicates with the drainage tunnel 21.

As shown in FIG. 6A, the top plate 3b is provided with a first convex portion 35b on the inner peripheral surface 33b of the top plate opening 29b. The convex portion 35b is provided only on the lower half of the thickness of the top plate 3b. The convex portion 35b is provided with a hole 41b in the vertical direction.

As shown in FIGS. 6 (b) and 6 (d), the bottom slab 5b is provided with a convex portion 47b on the inner peripheral surface 45b of the bottom slab opening 31b. The convex portion 47b is provided only on the lower half portion of the thickness of the bottom plate 5b. The convex portion 47b is provided with a hole 49b in the vertical direction. The bracket 19b that supports the lower surface 4b of the bottom plate 5b is provided with a ring-shaped water blocking material 71b made of rubber or the like on the upper surface 69b.

As shown in FIGS. 6 (b) and 6 (c), the lid 11b has a second convex portion for being overlapped and joined to the outer peripheral surface 55b with the first convex portion 35b provided on the top plate 3b. 57b is provided. The convex portion 57b is provided only on the upper half of the thickness of the lid 11b. The convex portion 57b is provided with a hole 65b in the vertical direction.

Further, the lid 11b is provided with an air supply / exhaust port 13 near the center. An air supply / exhaust pipe 15 is attached to the air supply / exhaust port 13. The air supply / exhaust pipe 15 is provided with an air supply / exhaust valve 17.

The major axis and minor axis of the lid 11b including the convex portion 57b are slightly smaller than the major axis and minor axis of the inner peripheral surface 33b of the top plate opening 29b, but are substantially the same. Further, in the example shown in FIG. 6, the minor axis 79 (FIG. 6 (d)) of the lid 11b including the convex portion 57b is the major axis 73 (FIG. 6) of the inner peripheral surface 75 of the convex portion 35b provided on the top plate 3b. It is smaller than 6 (a)).

(How to replace the lid 11b at the water outlet 1b)
When closing the top plate opening 29b of the top plate 3b of the water discharge port 1b with the lid 11b, as shown in FIG. 6B, the lid is placed on the first convex portion 35b provided on the top plate 3b. The second convex portion 57b provided on the 11b is overlapped. Then, the hole 65b of the convex portion 57b and the hole 41b of the convex portion 35b (FIG. 6A) are communicated with each other, the bolt 89 is inserted, and the convex portion 57b is fixed to the convex portion 35b.

When replacing the lid 11b from the top plate opening 29b to the bottom plate opening 31b, from the state shown in FIG. 6 (b), the bolt 89 for fixing the convex portion 57b to the convex portion 35b is communicated with the hole 65b and the hole 65b. Remove from hole 41b (FIG. 6 (a)).

Then, the lid 11b is suspended by using a crane carrier or the like, the lid 11b is tilted substantially vertically as shown in FIGS. 6 (c) and 6 (d), and the minor axis 79 of the lid 11b including the convex portion 57b is included. The lid 11b is passed through the top plate opening 29b by rotating the lid 11b by about 90 degrees so that the direction of is the direction of the major axis 73 (FIG. 6A) of the inner peripheral surface 75 of the top plate 3b including the convex portion 35b. After that, the lid 11b is returned horizontally and rotated in the water discharge port 1b, and the lid 11b is suspended to the bottom slab opening 31b.

When the bottom slab opening 31b of the bottom slab 5b of the water discharge port 1b is closed with the lid 11b, as shown in FIG. 6 (f), the convex portion 47b provided on the bottom slab 5b is covered with the convex provided on the lid 11b. The portions 57b are overlapped. Then, as shown in FIG. 6E, the hole 65b of the convex portion 57b and the hole 49b of the convex portion 47b (FIG. 6B) are communicated with each other, the bolt 89 is inserted, and the convex portion 57b is passed through the convex portion 47b. Fix to.

When the bottom slab opening 31b is closed with the lid 11b, the water blocking material 71b installed on the upper surface 69b of the bracket 19b shown in FIG. 6 (b) becomes the lower surface 12b of the lid 11b and the upper surface of the bracket 19b shown in FIG. 6 (f). It is sandwiched between 69b and a water-stopping effect.

When replacing the lid 11b from the bottom slab opening 31b to the top slab opening 29b, bolts 89 for fixing the convex portion 57b to the convex portion 47b are provided from the states shown in FIGS. 6 (e) and 6 (f). , Removed from the communicating holes 65b and 49b (FIG. 6B).

Then, the lid 11b is suspended by using a crane carrier or the like, and as shown in FIGS. 6 (c) and 6 (d), the lid 11b is tilted and rotated, and is lifted through the top plate opening 29b. After that, the lid 11b is returned horizontally and rotated on the water discharge port 1b, the lid 11b is installed in the top plate opening 29b as shown in FIG. 6 (b), and the lid is placed on the convex portion 35b of the top plate 3b. The convex portions 57b of 11b are overlapped and fixed with bolts 89 to close the top plate opening 29b.

(Maintenance method of drainage tunnel 21)
When the water discharge port 1b and the water discharge channel tunnel 21 are used, a lid 11b is installed at the top plate opening 29b of the top plate 3b of the water discharge port 1b as shown in FIG. 6 (b). The lid 11b is fixed to the top plate 3b and closes the top plate opening 29b. The inside of the drainage tunnel 21 and the drainage port 1b is filled with water, and water is discharged from the nozzle 9 as needed.

When the drainage tunnel 21 is maintained, the lid 11b is replaced from the top plate opening 29b of the top plate 3b to the bottom plate opening 31b of the bottom plate 5b from the state shown in FIG. 6 (b) by the above procedure. As shown in 6 (e) and FIG. 6 (f), the bottom slab opening 31b is closed with the lid 11b.

After that, in the same manner as in the first embodiment, water is drained from the inside of the drainage tunnel 21 to bring the inside of the drainage tunnel 21 into a dry-up state. Then, the inside of the drainage tunnel 21 is maintained by aerial work. After the maintenance is completed, water is injected into the inside of the tailrace tunnel 21 in the same manner as in the first embodiment.

After the water injection is completed, the lid 11b is replaced from the bottom slab opening 31b of the bottom slab 5b to the top slab opening 29b of the top slab 3b from the state shown in FIGS. 6 (e) and 6 (f) by the above procedure. , As shown in FIG. 6B, the lid 11b closes the top plate opening 29b.

As described above, in the third embodiment, the bottom slab opening 31b is closed by using the lid 11b that can be replaced with the top slab opening 29b and the bottom slab opening 31b, and then the inside of the drainage tunnel 21 is drained. And perform maintenance. As a result, water can be stopped at a position where the drainage tunnel 21 and the discharge port 1 communicate with each other to dry up the entire area of the drainage tunnel 21, so that the entire area of the drainage tunnel 21 can be inspected and repaired. It can be easily done by work.

Also in the third embodiment, since the top plate lid of the top plate opening 29b and the water stop lid of the bottom plate opening 31b are shared by one lid 11b, the water stop lid can be transported from land or land. There is no need to secure a storage place dedicated to the water stop lid. Further, the lid 11b can be protected from corrosion at the same time as the water discharge port 1b by the heavy corrosion protection coating or the electric corrosion protection applied to the water discharge port 1b.

In the third embodiment, the top plate opening 29b and the lid 11b are made elliptical, and the lid 11b is tilted and rotated substantially vertically to pass through the top plate opening 29b, thereby passing through the top plate opening 29b. , The lid 11b can be easily taken in and out from the water discharge port 1b.

In the third embodiment, when the lid 11b is installed in the bottom slab opening 31b, the convex portion 57b and the convex portion 47b are fixed by the bolt 89, but the installation of the bolt 89 is not essential.

Further, in the third embodiment, the minor axis 79 (FIG. 6 (d)) of the lid 11b including the convex portion 57b is provided with the major axis 73 (major axis 73) of the inner peripheral surface 75 of the convex portion 35b provided on the top plate 3b. It was made smaller than FIG. 6A), and when the lid 11b was passed through the top plate opening 29b, the lid 11b was tilted substantially vertically and rotated by about 90 degrees, but the relationship between the minor axis 79 and the major axis 73 was This is not the case. The inclination and rotation angle of the lid 11b when passing through the top plate opening 29b may be adjusted according to the shapes of the top plate opening 29b and the lid 11b.

Next, a fourth embodiment will be described.
FIG. 7 is a diagram showing a method of replacing the lid 11c at the water discharge port 1c. FIG. 7A is a view of the water discharge port 1b viewed from above, and only half of the lid 11c is shown. FIG. 7B is a cross-sectional perspective view of the lid 11b fixed to the top plate 3b. FIG. 7B is a cross-sectional perspective view at the position indicated by arrows K1-K1 in FIG. 7A. FIG. 7C is a vertical cross-sectional view of the left half of the jig 81. 7 (d) and 7 (e) are views showing a state in which the lid 11c is passed through the top plate opening 29c. FIG. 7 (e) is a diagram showing a cross section taken along the arrow K2-K2 of FIG. 7 (d). 7 (f) and 7 (g) are views showing a state in which the lid 11c is fixed to the bottom plate 5c. FIG. 7 (f) is a diagram showing a cross section taken along the arrow K4-K4 of FIG. 7 (g), and FIG. 7 (g) is a diagram showing a cross section taken along the arrow K3-K3 of FIG. 7 (f).

(Structure of outlet 1c and outlet tunnel 21)
As shown in FIG. 7, the water discharge port 1c has substantially the same configuration as the water discharge port 1 of the first embodiment, but instead of the top plate 3, a top plate 3c having a top plate opening 29c is provided. Be done. Further, instead of the bottom plate 5, a bottom plate 5c having a bottom plate opening 31c is provided. Further, instead of the lid 11, a lid 11c that can be replaced with the top plate opening 29c and the bottom plate opening 31c is provided. The top plate opening 29c, the bottom plate opening 31c, and the lid 11c are circular. The water discharge port 1c is installed on the bottom of the water in the same manner as the water discharge port 1 of the first embodiment.

The drainage tunnel 21 has the same configuration as the drainage tunnel 21 of the first embodiment. As shown in FIG. 7B, the bracket 19 provided in the drainage tunnel 21 supports the lower surface 4c of the bottom slab 5c of the drainage port 1c at the upper surface 69. The bottom slab opening 31c of the bottom slab 5c communicates with the drainage tunnel 21.

As shown in FIGS. 7 (a) and 7 (b), a jig 81 is installed on the inner peripheral surface 33c of the top plate opening 29c of the top plate 3c.

As shown in FIGS. 7 (a) to 7 (c), the jig 81 includes a tubular member 91, a collar-shaped member 93, a collar-shaped member 95, and a hinge portion 87. The tubular member 91 is arranged along the inner peripheral surface 33c of the top plate opening 29c. The collar-shaped member 93 is an annular member provided so as to project from the outer peripheral side of the tubular member 91, and is integrated with the upper end of the tubular member 91. The brim-shaped member 93 is arranged along the upper surface 85 of the top plate 3c. The collar-shaped member 95 is provided so as to project from the inner peripheral side of the tubular member 91, and is integrated with the lower end of the tubular member 91. The collar-shaped member 95 is a member for overlapping and joining the lid 11c, and is provided with a hole 83 in the vertical direction. The brim-shaped member 95 has two brim-shaped members 95a integrated with a hinge portion 87 at the lower end of the tubular member 91. As shown in the right side view of FIG. 7 (c) and FIG. 7 (g), the collar-shaped member 95a is rotated by the hinge portion 87 and opens downward.

As shown in FIG. 7B, the bracket 19 that supports the lower surface 4c of the bottom plate 5c is provided with a ring-shaped water blocking material 71 made of rubber or the like on the upper surface 69.

As shown in FIGS. 7 (a) and 7 (b), the lid 11c is provided with a hole 65c in the vertical direction near the outer circumference. The diameter of the lid 11c is slightly smaller than the diameter of the inner peripheral surface of the tubular member 91 of the jig 81, but is substantially the same.

Further, the lid 11c is provided with an air supply / exhaust port 13 near the center. An air supply / exhaust pipe 15 is attached to the air supply / exhaust port 13. The air supply / exhaust pipe 15 is provided with an air supply / exhaust valve 17.

(How to replace the lid 11c at the water outlet 1c)
When closing the top plate opening 29c of the top plate 3c of the water discharge port 1c with the lid 11c, as shown in FIGS. 7 (a) and 7 (b), the jig 81 installed in the top plate opening 29c The lid 11c is superposed on the brim-shaped member 95 of the above. Then, the hole 65c of the lid 11c and the hole 83 of the collar-shaped member 95 are communicated with each other, the bolt 89 is inserted, the lid 11c is fixed to the collar-shaped member 95, and the top plate opening 29c is closed.

When replacing the lid 11c from the top plate opening 29c to the bottom plate opening 31c, a bolt 89 for fixing the lid 11c to the collar-shaped member 95 is provided from the state shown in FIGS. 7 (a) and 7 (b). , Remove from the communicating holes 65c and 83.

Then, the lid 11c is suspended using a crane carrier or the like, and as shown in FIGS. 7 (d) and 7 (e), the collar-shaped member 95a of the jig 81 is opened downward, and the lid 11c is tilted to tilt the lid. 11c is passed through the top plate opening 29c. After that, the lid 11c is returned horizontally and rotated in the water discharge port 1c, and the lid 11c is suspended to the bottom slab opening 31c.

When the bottom slab opening 31c of the bottom slab 5c of the water discharge port 1c is closed with the lid 11c, as shown in FIGS. 7 (f) and 7 (g), the bottom slab opening 31c provided in the bottom slab 5c is closed with the lid 11c. Fit in. A convex portion may be provided on the inner peripheral surface 45c of the bottom slab opening 31c.

When the bottom slab opening 31c is closed with the lid 11c, the water blocking material 71 installed on the upper surface 69 of the bracket 19 shown in FIG. 7 (b) becomes the lower surface 12c of the lid 11c and the bracket 19 as shown in FIG. 7 (g). It is sandwiched between the upper surface 69 and the water stop effect.

When replacing the lid 11c from the bottom slab opening 31c to the top slab opening 29c, the lid 11c is suspended from the state shown in FIGS. 7 (f) and 7 (g) using a crane carrier or the like, and FIG. 7 ( As shown in d) and FIG. 7 (e), the lid 11c is tilted and rotated to lift the flange-shaped member 95a of the jig 81 through the top plate opening 29c in an open state. After that, the opened collar-shaped member 95a is returned to the horizontal position, and the lid 11c is returned to the horizontal position on the water discharge port 1c. As shown in FIGS. 7 (a) and 7 (b), the lid 11c and the collar-shaped member 95 are combined. Is fixed with a bolt 89 to close the top plate opening 29c.

(Maintenance method of drainage tunnel 21)
When the outlet 1c and the outlet tunnel 21 are used, as shown in FIGS. 7 (a) and 7 (b), the lid 11c is attached to the top plate opening 29c of the top plate 3c of the water discharge port 1c. is set up. The lid 11c is fixed to the top plate 3c and closes the top plate opening 29c. The inside of the drainage tunnel 21 and the drainage port 1c is filled with water, and water is discharged from the nozzle 9 as needed.

When the drainage tunnel 21 is maintained, the lid 11c is changed from the top plate opening 29c of the top plate 3c to the bottom plate opening of the bottom plate 5c by the above procedure from the state shown in FIGS. 7 (a) and 7 (b). Replacing with 31c, as shown in FIGS. 7 (f) and 7 (g), the bottom slab opening 31c is closed with the lid 11c.

After that, in the same manner as in the first embodiment, water is drained from the inside of the drainage tunnel 21 to bring the inside of the drainage tunnel 21 into a dry-up state. Then, the inside of the drainage tunnel 21 is maintained by aerial work. After the maintenance is completed, water is injected into the inside of the tailrace tunnel 21 in the same manner as in the first embodiment.

After the water injection is completed, from the state shown in FIGS. 7 (f) and 7 (g), the lid 11c is replaced from the bottom slab opening 31c of the bottom slab 5c to the top slab opening 29c of the top slab 3c by the above procedure. As shown in 7 (a) and 7 (b), the lid 11c closes the top plate opening 29c.

As described above, in the fourth embodiment, after closing the bottom slab opening 31c with the lid 11c that can be replaced with the top slab opening 29c and the bottom slab opening 31c, the inside of the drainage tunnel 21 is drained. And perform maintenance. As a result, water can be stopped at a position where the drainage tunnel 21 and the discharge port 1 communicate with each other to dry up the entire area of the drainage tunnel 21, so that the entire area of the drainage tunnel 21 can be inspected and repaired. It can be easily done by work.

Also in the fourth embodiment, since the top plate lid of the top plate opening 29c and the water stop lid of the bottom plate opening 31c are shared by one lid 11c, the water stop lid can be transported from land or land. There is no need to secure a storage place dedicated to the water stop lid. Further, the lid 11c can be protected from corrosion at the same time as the water discharge port 1c by the heavy corrosion protection coating or the electric corrosion protection applied to the water discharge port 1c.

In the fourth embodiment, the flange-shaped member 95a of the jig 81 installed in the top plate opening 29c is opened downward, and the lid 11c is tilted to pass through the tubular member 91 of the jig 81 to open the top plate. The lid 11c can be easily taken in and out from the water discharge port 1c via the portion 29c.

In the first to fourth embodiments, the lid installed in the top slab opening is removed and installed in the bottom slab opening, water is drained from the drainage tunnel, maintenance is performed, and then the drainage tunnel is used. Water was injected, the lid installed in the bottom slab opening was removed, and the lid was installed in the top slab opening. However, the maintenance method in the intake / discharge tunnel of the present invention may not include all of these steps. When replacing the existing lid with a new one because the existing lid has deteriorated, remove the existing lid installed in the top slab opening, install the new lid in the bottom slab opening, and from inside the drainage tunnel. Drain water for maintenance, inject water into the tailrace tunnel, remove the lid installed at the bottom slab opening, and install it at the top slab opening.

The maintenance method in the intake / discharge tunnel of the present invention can also be applied to the maintenance of a drain tunnel connected to another outlet. FIG. 8 is a diagram showing an example of a drainage tunnel 21 having a drainage port 1d. FIG. 8A is a vertical cross-sectional view of the water discharge port 1d with the lid 11d installed in the top plate opening 29d, and FIG. 8B shows the lid 11d suspended from the top plate opening 29d to the bottom plate opening 31d. A vertical cross-sectional view of the water discharge port 1d in the lowered state, FIG. 8C is a vertical cross-sectional view of the water discharge port 1d in a state where the lid 11d is installed in the bottom slab opening 31d.

The water discharge port 1d shown in FIG. 8 has substantially the same configuration as the water discharge port 1 of the first embodiment, but instead of the top plate 3, a top plate 3b having a top plate opening 29b is provided. Further, instead of the bottom plate 5, a bottom plate 5b having a bottom plate opening 31b is provided. Further, instead of the lid 11, a lid 11b that can be replaced with the top plate opening 29b and the bottom plate opening 31b is provided. The top plate opening 29b, the bottom plate opening 31b, and the lid 11b are circular.

As shown in FIG. 8C, the top plate 3d is provided with a first convex portion 35d on the inner peripheral surface 33d of the top plate opening 29d. The convex portion 35d is provided only in the lower half of the thickness of the top plate 3d. As shown in FIG. 8A, the bottom slab 5d is provided with a convex portion 47d on the inner peripheral surface 45d of the bottom slab opening 31d. The convex portion 47d is provided only on the lower half portion of the thickness of the bottom plate 5d.

As shown in FIG. 8B, the lid 11d is provided with a second convex portion 57d on the outer peripheral surface 55d for overlapping and joining the first convex portion 35d provided on the top plate 3d. The convex portion 57d is provided only on the upper half of the thickness of the lid 11b. The diameter of the lid 11d including the convex portion 57d in the horizontal state is slightly smaller than the diameter of the inner peripheral surface 33d of the top plate opening 29d, but is almost the same.

When closing the top plate opening 29d of the top plate 3d of the water discharge port 1d with the lid 11d, as shown in FIG. 8A, the lid is placed on the first convex portion 35d provided on the top plate 3d. The second convex portion 57d provided on the 11d is overlapped. Then, the convex portion 57d is fixed to the convex portion 35d using holes and bolts (not shown).

When replacing the lid 11d from the top plate opening 29d to the bottom plate opening 31d, a bolt (not shown) for fixing the convex portion 57d to the convex portion 35d was removed from the state shown in FIG. 8A, and the crane carrier was used. Or the like to hang the lid 11d. As shown in FIG. 8B, the lid 11d has a narrower diameter in a plan view when suspended. Therefore, the lid 11d is passed through the top slab opening 29d in a suspended state, and the bottom slab opening is indicated by an arrow L. Suspend up to 31b.

When the bottom slab opening 31d of the bottom slab 5d of the water discharge port 1d is closed with the lid 11d, as shown in FIG. 8C, the convex portion 47d provided on the bottom slab 5d is covered with the convex provided on the lid 11d. The parts 57d are overlapped. Then, the convex portion 57d is fixed to the convex portion 47d using holes and bolts (not shown).

When the bottom slab opening 31d is closed with the lid 11d, as shown in FIG. 8C, a water blocking material (not shown) installed on the upper surface 69 of the bracket 19 is formed between the lower surface 12b of the lid 11d and the upper surface 69 of the bracket 19. It is sandwiched between them and has a water-stopping effect.

When replacing the lid 11d from the bottom slab opening 31d to the top slab opening 29d, the bolt 89 (not shown) for fixing the convex portion 57d to the convex portion 47d is removed from the state shown in FIG. Suspend the lid 11d using a ship or the like. Then, as shown in FIG. 8B, the lid 11d having a narrowed diameter in a plan view is lifted and passed through the top plate opening 29d, and the convex portion 35d of the top plate 3d and the convex portion 57d of the lid 11d are formed. Are overlapped and fixed using holes and bolts (not shown) to close the top plate opening 29d.

Also in the water discharge port 1d shown in FIG. 8, the lid 11d can be easily taken in and out from the water discharge port 1d through the top plate opening 29d. Further, the top plate lid of the top plate opening 29d and the water stop lid of the bottom plate opening 31d are also used by one lid 11d, and after closing the bottom plate opening 31c with the lid 11d, the inside of the drainage tunnel 21 is pulled out. By performing maintenance with water, the same effect as that of the first to fourth embodiments can be obtained.

In the first to third embodiments and the example shown in FIG. 8, the first convex portion is provided in the lower half of the thickness of the top plate, and the second convex portion is provided in the upper half of the thickness of the lid. , The first convex portion and the second convex portion were overlapped and fixed, but the first convex portion was provided in the upper half of the thickness of the top plate, and the second convex portion was provided in the lower half of the thickness of the lid. May be provided so that the first convex portion and the second convex portion are overlapped and fixed. Further, the means for fixing the convex portion of the lid and the convex portion of the top plate is not limited to the hole and the bolt 89.

In the first to fourth embodiments and the example shown in FIG. 8, the air supply / exhaust pipe 15 having the air supply / exhaust valve 17 is installed in the air supply / exhaust port 13 provided on the lid, and the air supply / exhaust pipe 15 is installed at the time of air supply / exhaust. However, it is not necessary to install the air supply / exhaust pipe 15 and the air supply / exhaust valve 17 in advance at the air supply / exhaust port 13. At the time of air supply / exhaust, the air supply / exhaust valve 17 and the air supply / exhaust pipe 15 may be installed at the air supply / exhaust port 13.

In the first to fourth embodiments, the example in which the drainage tunnel 21 is connected below the drainage port has been described, but the maintenance method of the intake and dischargeway tunnel of the present invention has a water intake below the intake port. It can also be applied to the example where road tunnels are connected. Further, the water intake / discharge port of the present invention can also be applied to the water intake port.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modified examples or modified examples within the scope of the technical idea disclosed in the present application, and these also naturally belong to the technical scope of the present invention. Understood.

1, 1a, 1b, 1c, 1d ……… Water outlets 3, 3a, 3b, 3c, 3d ……… Top plates 4, 4a, 4b, 4c, 12, 12a, 12b, 12c, 12d ……… Bottom surface 5 5, 5a, 5b, 5c, 5d ……… Bottom plate 7 ………… Side wall 9 ………… Nozzle 11, 11a, 11b, 11c, 11d ………… Lid 13 ………… Air supply / exhaust ports 14, 14a, 28, 28a… …… Diameter 15 ………… Supply / exhaust pipe 17 ………… Supply / exhaust valves 19, 19b ………… Bracket 21 ………… Drainage tunnel 23 ………… Underwater 25 ………… Ground 27 ………… Water 29, 29a, 29b, 29c, 29d ……… Top plate openings 31, 31a, 31b, 31c, 31d ……… Bottom plate openings 30, 33, 33a, 33b, 33c, 33d, 45, 45a, 45b, 45c, 45d, 75 ……… Inner peripheral surfaces 35, 35a, 35b, 35d, 47, 47a, 47b, 47d, 57, 57a, 57b, 57d ……… Convex parts 37, 37a, 51, 51a, 59, 59a ……… Thickness 39 , 39a, 53, 53a ……… Lower half 41, 41a, 41b, 49, 49a, 49b, 65, 65a, 65b, 65c, 83 ……… Hole 43, 43a, 63 ……… Notch 55, 55a, 55b, 55d, 56 ……… Outer surface 61, 61a ……… Upper half 67, 67a ……… Notch cap 69, 69b, 85 ……… Top surface 71, 71b ……… Water stop material 73 ………… Major diameter 79 ………… Short diameter 81 ………… Jig 87 ………… Hinge 89 ………… Bolt 91 ………… Cylindrical member 93, 95, 95a ………… Lid-shaped member

Claims (8)

It is a maintenance method in an intake / discharge tunnel connected below an intake / discharge port having a top plate, a bottom plate, and a side wall.
Step a of removing the lid installed in the top plate opening provided in the top plate, and
The step b of installing the lid in the bottom slab opening provided in the bottom slab so as to communicate with the intake / discharge tunnel and closing the bottom slab opening.
Step c of draining water from the inside of the intake / discharge tunnel while supplying air from the air supply / exhaust port provided on the lid.
Step d of performing maintenance inside the intake and discharge tunnel, and
A maintenance method in an intake / drainage tunnel, which is characterized by being equipped with. It is a maintenance method in an intake / discharge tunnel connected below an intake / discharge port having a top plate, a bottom plate, and a side wall.
The step b of installing the lid in the bottom slab opening provided in the bottom slab so as to communicate with the intake / discharge tunnel and closing the bottom slab opening.
Step c of draining water from the inside of the intake / discharge tunnel while supplying air from the air supply / exhaust port provided on the lid.
Step d of performing maintenance inside the intake and discharge tunnel, and
Step e of injecting water into the inside of the intake / discharge tunnel while exhausting air from the air supply / exhaust port provided on the lid.
Step f of removing the lid from the bottom slab opening,
The step g of installing the lid in the top plate opening provided in the top plate and closing the top plate opening,
A maintenance method in an intake / drainage tunnel, which is characterized by being equipped with. The maintenance method in an intake / exhaust tunnel according to claim 1 or 2, wherein an air supply / exhaust valve and an air supply / exhaust pipe are installed at the air supply / exhaust port. A first convex portion is provided on the inner peripheral surface of the top plate opening.
A second convex portion for overlapping and joining the first convex portion is provided on the outer peripheral surface of the lid.
The maintenance in the intake / discharge channel tunnel according to any one of claims 1 to 3, wherein the lid is taken in and out from the intake / discharge port through a notch provided in the first convex portion. Method. An intake / discharge port connected above the intake / discharge tunnel.
A top plate with a top plate opening and
A bottom slab having a bottom slab opening communicating with the intake / discharge tunnel and
A side wall provided between the top plate and the bottom plate,
A lid that can be replaced with the top plate opening and the bottom plate opening,
Equipped with
A first convex portion is provided on the inner peripheral surface of the top plate opening.
A second convex portion for overlapping and joining the first convex portion is provided on the outer peripheral surface of the lid.
A water intake / discharge port, characterized in that the lid can be taken in and out of the water intake / discharge port through the top plate opening by passing through a notch provided in the first convex portion. An intake / discharge port connected above the intake / discharge tunnel.
A top plate with a top plate opening and
A bottom slab having a bottom slab opening communicating with the intake / discharge tunnel and
A side wall provided between the top plate and the bottom plate,
A lid that can be replaced with the top plate opening and the bottom plate opening,
Equipped with
A first convex portion is provided on the inner peripheral surface of the top plate opening.
A second convex portion for overlapping and joining the first convex portion is provided on the outer peripheral surface of the lid.
The top plate opening and the lid are oval and
A water intake / discharge port, characterized in that the lid can be taken in and out of the water intake / discharge port through the top plate opening by tilting and rotating the lid. An intake / discharge port connected above the intake / discharge tunnel.
A top plate with a top plate opening and
A bottom slab with a bottom slab opening that communicates with the intake and drainage tunnel,
A side wall provided between the top plate and the bottom plate,
A lid that can be replaced with the top plate opening and the bottom plate opening,
Equipped with
An annular jig having a brim-shaped portion for overlapping and joining with the lid is provided on the inner peripheral surface of the top plate opening.
A water intake / discharge port, characterized in that the lid can be taken in and out of the water intake / discharge port through the top plate opening by opening a part of the collar-shaped portion by a hinge structure. The water intake / discharge port according to any one of claims 5 to 7, wherein an air supply / exhaust port is provided on the lid, and an air supply / exhaust valve and an air supply / exhaust pipe are installed on the air supply / exhaust port.

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