JP2017008496A - Installation method for water cut-off cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installation method for a water cut-off cover that curtails work time and enables the water cut-off cover to be installed without using an excessively large-scale facility.SOLUTION: An installation method for a water cut-off cover is for closing with water cut-off covers (50, 51) upstream-side openings (21a, 22a) that open on a water side of a dam 100, of a pipe arrangement (a discharge pipe 21, a filling pipe 22) installed in an outlet structure 20 for the water stored in the dam 100. The installation method includes the following steps: a layout step in which the water cut-off cover is laid out at a location to cover the upstream-side opening of the pipe arrangement filled with water, using a moving device 40; and a closing step in which water inside the pipe arrangement is drained from a downstream side while positioning the water cut-off cover at the location to cover the upstream-side opening, and the upstream-side opening is closed by having the water cut-off cover pressed toward a pipe arrangement side using a pressure difference generating between a dam lake 30 and inside the pipe arrangement.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a waterproofing lid construction method.

  The dam is provided with a discharge facility for discharging the stored water downstream. The discharge facility is provided with pipes such as a discharge pipe for flowing the water of the dam to the downstream side and a filling pipe for supplying the water of the dam to the discharge pipe (for example, refer to Patent Document 1). A gate that can be opened and closed is provided at the downstream opening of the discharge pipe. When the gate is open, the dam water flows through the discharge pipe and is discharged from the downstream opening. When the gate is closed, the discharge is not performed and the discharge pipe is filled with the water of the dam. In addition, a valve is provided in the filling pipe. By opening and closing this valve, it is possible to switch between supply and stop of water supply to the discharge pipe.

  In such a discharge facility, it is necessary to perform the inside of the piping as a dry environment when performing maintenance on the gates and valves. In other words, it is necessary to perform maintenance with the water in the piping removed. For example, some dams that have been constructed relatively recently have a spare gate capable of closing the upstream opening of the pipe. In such a dam, when draining the water in the pipe, the preliminary gate is closed to close the upstream opening, and in this state, the water in the pipe is discharged from the downstream side.

  On the other hand, some dams do not have a spare gate as described above. In such a dam, when draining water from the pipe, a diver with a water stop lid dives into the water of the dam and attaches a water stop lid to the upstream opening to close the water (underwater construction method) ). In the underwater construction method by a diver, the deeper the diver dive, the shorter the time available for underwater work. For this reason, in order to reduce the diving depth of divers, discharge is carried out, and a plurality of divers are diving in turn and working.

JP 2014-234668 A

  However, when performing discharge for reducing the water depth, time is required for the discharge operation. Moreover, when a diver dives deeply, it takes a long time for the diver to rise after work. Thus, in the underwater construction method by a diver, the time required for the work becomes long. In addition, since a facility such as a re-pressure chamber used when the diver ascends is necessary, it is a large-scale work.

  The present invention has been made in view of the above, and it is possible to reduce the work time and to provide a waterproofing lid construction method capable of arranging a waterproofing lid without requiring large-scale equipment. Objective.

  The water-stop cover construction method according to the present invention is a water-stop cover construction that closes an upstream side opening that is opened on the water side of the dam with a water-stop cover among pipes provided in a water discharge facility stored in the dam. A method for holding the water stop lid on a moving device capable of moving in water, and using the moving device to place the water stop lid at a position covering the upstream opening of the pipe filled with water. With the arrangement step to arrange, and with the water stop lid arranged at a position covering the upstream opening, the water in the pipe is drawn from the downstream side of the pipe, and between the water in the dam and the pipe A blocking step of closing the upstream opening by pressing the water stop lid toward the pipe side due to a pressure difference that occurs.

  According to the present invention, since the moving device is used when the water stop lid is arranged at the upstream opening of the pipe, it is necessary to adjust the working environment suitable for the diver, for example, by lowering the water level of the dam. Absent. Moreover, it is not necessary to consider the time for the diver to ascend, and equipment such as a re-pressure chamber is not required. Thereby, working time can be shortened and it becomes possible to arrange | position a water stop lid | cover, without requiring large equipment.

  In the waterstop construction method, the placement step is performed in a state where the depth from the water surface of the dam to the upstream opening is not less than a predetermined depth.

  According to the present invention, by using the moving device, even when the depth from the water surface of the dam to the upstream opening is deep, the operation time can be shortened without requiring a large facility. A water lid can be arranged. In addition, even if the diver is difficult to dive, a water stop lid can be arranged.

  In the water stop lid construction method, the closing step is performed in a state where the moving device holds the water stop lid.

  According to the present invention, since the water stop lid is held by the moving device, it is possible to suppress the displacement of the water stop lid.

  The water stopping lid construction method further includes a detaching step of detaching the moving device from the water stopping lid in a state where the upstream opening is closed after the closing step.

  According to the present invention, by detaching the moving device from the water stop lid, the moving device can be temporarily collected and subjected to maintenance or the like, or the moving device can be used for other purposes.

  In the waterstop construction method, after the clogging step, water is supplied to the pipe blocked by the waterstop, and the pressure difference between the water in the dam and the pipe is reduced. It further includes a water step and an opening step of removing the water stop lid from the upstream opening using the moving device in a state where the pressure difference is reduced, and opening the upstream opening.

  According to the present invention, since the moving device is used even when removing the water stop lid, it is not necessary to adjust to a working environment suitable for a diver. Thereby, work time can be shortened and it becomes possible to arrange a water stop lid efficiently.

  In the waterstop cover construction method, the pipe has a discharge pipe for discharging the water and a water supply pipe for supplying water to the discharge pipe, and the waterstop cover is used for closing the discharge pipe. The water filling step is performed using the water filling pipe.

  According to the present invention, since the discharge pipe is filled using the filling pipe, the filling process can be performed efficiently.

  In the water stop cover construction method, the pipe has a discharge pipe for discharging the water and a water supply pipe for supplying water to the discharge pipe, and the water stop cover is used for closing the water supply pipe. And an openable / closable portion that can be opened and closed in a state where the water filling pipe is closed, and the water filling step is performed by opening the openable / closable portion of the water stop lid.

  ADVANTAGE OF THE INVENTION According to this invention, when opening the said obstruction | occlusion state from the state which the water stop cover obstruct | occluded the water-filling pipe, it can supply water to a water-filling pipe efficiently by opening an opening-closing part.

  In the water stop lid construction method, a preliminary gate capable of opening and closing the discharge pipe is provided on the upstream side of the discharge pipe, and the upstream side of the discharge pipe is closed using the spare gate, An arrangement step and the closing step are performed.

  According to the present invention, since the filling pipe is closed by the water stop lid in the state where the upstream side of the discharge pipe is closed using the spare gate, it is possible to reliably prevent the water of the dam from flowing into the discharge pipe. it can. Thereby, the inside of a water pipe can be reliably made into a dry environment.

  According to the waterproofing lid construction method according to the present invention, the working time can be shortened and the waterproofing lid can be efficiently arranged.

FIG. 1 is a diagram illustrating an example of a dam according to the present embodiment. FIG. 2 is a process diagram showing a construction method for a waterstop according to the present embodiment. FIG. 3 is a process diagram showing a construction method of a waterstop according to this embodiment. FIG. 4 is a process diagram showing a construction method of a waterstop according to this embodiment. FIG. 5 is a process diagram showing a construction method of a waterstop according to the present embodiment. FIG. 6 is a process diagram showing a construction method for a waterstop according to this embodiment. FIG. 7 is a process diagram showing a construction method for a waterstop according to the present embodiment. FIG. 8 is a process diagram showing a construction method of a water stop lid according to the present embodiment. FIG. 9 is a process diagram showing a construction method of a water stop lid according to this embodiment. FIG. 10 is a process diagram showing a construction method of a waterstop according to this embodiment. FIG. 11 is a process diagram showing a construction method for a waterstop according to the present embodiment. FIG. 12 is a process diagram illustrating a construction method of a waterstop according to a modification. FIG. 13 is a diagram illustrating an example of a moving device according to a modification. FIG. 14 is a diagram illustrating an example of a dam according to a modification.

  Hereinafter, an embodiment of a waterstop construction method according to the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a diagram illustrating an example of a dam 100 according to the present embodiment. The dam 100 includes a bank body 10 and a discharge facility 20. The dam body 10 blocks the water of the dam lake 30. The discharge facility 20 discharges the water of the dam lake 30.

  The discharge facility 20 includes a discharge pipe 21 and a water filling pipe 22. The discharge pipe 21 has an upstream opening 21a and a downstream opening 21b. The upstream opening 21 a is upstream of the dam body 10 and opens into the dam lake 30. The water in the dam lake 30 flows into the discharge pipe 21 from the upstream opening 21a. The upstream opening 21a of the discharge pipe 21 is in an open state.

  The downstream opening 21 b is opened on the downstream side of the bank body 10. A gate 23 is provided in the downstream opening 21b. The gate 23 can open and close the downstream opening 21b. In the state where the gate 23 is opened, the water of the dam lake 30 flows through the discharge pipe 21 and is discharged from the downstream opening 21b. When the gate 23 is closed, the discharge is not performed, and the discharge pipe 21 is filled with the water of the dam lake 30.

  The filling pipe 22 supplies the water of the dam lake 30 to the discharge pipe 21. The water filling pipe 22 has an upstream opening 22a and a connection opening 22b. The upstream opening 22 a is opened in the dam lake 30. The water of the dam lake 30 flows into the filling pipe 22 from the upstream opening 22a. The connection opening 22 b is opened in the discharge pipe 21. The water filling pipe 22 supplies water into the discharge pipe 21 from the connection opening 22b.

  The water filling pipe 22 is provided with a main valve 24 and a sub valve 25. The main valve 24 and the sub valve 25 can open and close the flow path of the filling pipe 22. The main valve 24 is disposed downstream of the sub valve 25 (on the discharge pipe 21 side). Normally, the main valve 24 is closed and the sub valve 25 is opened. Further, when performing the water charging operation, the main valve 24 is opened. The sub valve 25 is closed when the main valve 24 is maintained in order to make the main valve 24 side dry.

  In a state where both the main valve 24 and the subvalve 25 are open, the discharge pipe 21 and the dam lake 30 are connected via the filling pipe 22. Therefore, the water of the dam lake 30 is supplied to the discharge pipe 21 through the water filling pipe 22. When at least one of the main valve 24 and the sub valve 25 is closed, the space between the discharge pipe 21 and the dam lake 30 is shielded, and water is not supplied to the discharge pipe 21. The operation portion 23 a of the gate 23 and the operation portions of the main valve 24 and the sub valve 25 are provided in the operation chamber 11. The operator can switch between opening and closing the gate 23, the main valve 24, and the sub valve 25 in the operation chamber 11.

  In the dam 100 configured as described above, when the maintenance inside the gate 23 and the discharge pipe 21 is performed, the inside of the discharge pipe 21 is made a dry environment. That is, maintenance is performed with the water in the discharge pipe 21 removed. In the dam 100 according to this embodiment, the upstream opening 21 a of the discharge pipe 21 is not provided with a closing means such as a spare gate. Therefore, when water in the discharge pipe 21 is drained, a water stop cover is attached to the upstream opening 21a to close it. 2-7 is process drawing which shows an example of the construction method of the water stop cover 50 which concerns on this embodiment.

  First, the water stopping lid 50 is held by the moving device 40 that can move in water. Then, the moving device 40 is thrown into the dam lake 30. For example, an underwater vehicle is used as the moving device 40. The moving device 40 includes, for example, a main body portion 41, a propulsive force generating portion 42, an arm 43, and a photographing device 44. The moving device 40 is connected to the operating device 46 of the carriage 60 by a wiring 45. The trolley 60 is used floating on the water surface of the dam lake 30, for example. An operator who operates the operation device 46 may board the trolley 60.

  The propulsion force generator 42 is provided with, for example, a propeller. A driving device for driving the propeller is provided in the main body 41. The arm 43 is detachable from the water stop lid 50. An image photographed by the photographing device 44 is transmitted to the operation device 46 via the wiring 45 or by wireless communication. The operation device 46 is provided with a display unit (not shown) that displays an image photographed by the photographing device 44. The operator can adjust the traveling direction of the moving device 40 while checking the display unit. The moving device 40 may be provided such that the position can be detected by sound waves or GPS. In addition, an illumination device that irradiates light onto the imaging target region of the imaging device 44 may be provided. The water blocking lid 50 may be configured such that a float (not shown) is formed and the weight in water is offset by buoyancy.

  After throwing the moving device 40 into the dam lake 30, the operator operates the operating device 46 while checking the display unit, and moves the moving device 40 to the front of the upstream opening 21a as shown in FIG. . An operator makes the water stop cover 50 in the state which faced the upstream opening part 21a, and brings the moving apparatus 40 close to the dam body 10 side. Then, the operator adjusts the position of the moving device 40 while confirming the image photographed by the photographing device 44, and arranges the water stop lid 50 at a position covering the upstream opening 21a as shown in FIG. (Arrangement process). At this time, the water blocking lid 50 is brought into contact with the outer peripheral portion of the bank body 10 or the discharge pipe 21.

  In this state, the operator opens the gate 23 as shown in FIG. The worker who opens the gate 23 may be different from the worker who operates the moving device 40. By opening the gate 23, the water in the discharge pipe 21 is discharged from the downstream opening 21b to the downstream side. As the water in the discharge pipe 21 is discharged, a pressure difference is generated between the water in the dam lake 30 and the discharge pipe 21. Due to this pressure difference, the water stop lid 50 is pressed toward the discharge pipe 21 side. Thereby, the upstream opening 21a is closed by the water blocking lid 50 (blocking step).

  When the water in the discharge pipe 21 is discharged and the upstream opening 21a is closed, the inside of the discharge pipe 21 becomes a dry environment. Therefore, the operator can appropriately perform maintenance in the gate 23 and the discharge pipe 21. When the inside of the discharge pipe 21 is kept in a dry environment for a long time after the closing step, the moving device 40 is moved from the water stop lid 50 in a state where the upstream opening 21a is closed as shown in FIG. 5, for example. May be released (detachment step). In this case, for example, the detached moving device 40 can be collected once for maintenance or used for other purposes.

  After performing the maintenance, the operator closes the gate 23 and then opens the main valve 24 as shown in FIG. As a result, the water of the dam lake 30 is supplied to the discharge pipe 21 through the filling pipe 22. In the discharge pipe 21, the upstream opening 21 a is closed by the water blocking lid 50, and the downstream opening 21 b is closed by the gate 23. Therefore, the water supplied from the filling pipe 22 is accumulated in the discharge pipe 21. Thereby, the pressure difference between the water of the dam lake 30 and the inside of the discharge pipe 21 reduces (water filling process).

  Thereafter, the operator moves the moving device 40 away from the bank body 10 in a state where the pressure difference is reduced. As shown in FIG. 7, the moving device 40 and the water blocking lid 50 are integrally separated from the bank body 10, and the water blocking lid 50 is removed from the upstream opening 21 a. Thereby, the upstream opening 21a is opened (opening step). After removing the waterproof cover 50, the operator pulls up the moving device 40 and collects the waterproof cover 50.

  On the other hand, when performing maintenance on the main valve 24 of the filling pipe 22, for example, the upstream side of the main valve 24 is closed by closing the sub valve 25 from the state shown in FIG. Then, by opening the main valve 24, water between the main valve 24 and the sub valve 25 can be discharged as shown in FIG. Thereby, the main valve 24 becomes a dry environment. The operator can perform maintenance on the main valve 24 in this state.

  On the other hand, when maintenance is performed on the sub valve 25 of the filling pipe 22, it is necessary to close the upstream opening 22 a and drain water upstream of the sub valve 25. In the dam 100 according to the present embodiment, no closing means such as a spare gate is provided in the upstream opening 22 a of the water filling pipe 22. Therefore, when water on the upstream side of the sub-valve 25 is drained, a water stop cover is attached to the upstream opening 22a to close it. The following FIGS. 9 to 11 are process diagrams showing an example of a construction method of the water blocking lid 51 according to the present embodiment.

  In this case, as shown in FIG. 9, the worker arranges the water stop lid 51 using the moving device 40 so as to cover the upstream side opening 22 a of the filling pipe 22 (arrangement step). The water stop lid 51 is formed to have a size capable of closing the upstream opening 22 a of the water filling pipe 22. The water stop lid 51 is formed with an opening penetrating the front and back, and an opening / closing part 51a is provided in the opening. By opening the opening / closing part 51a, the front and back of the water blocking lid 51 are communicated with each other through the opening. Moreover, the front and back of the water stop lid | cover 51 are obstruct | occluded by closing the opening-and-closing part 51a. The opening / closing part 51 a is opened and closed by an opening / closing mechanism (not shown) provided in the moving device 40. As shown in FIG. 9, when the water stop lid 51 is disposed, the opening / closing part 51a is kept closed.

  Next, the operator opens the sub valve 25 as shown in FIG. The water accumulated on the upstream side of the sub-valve 25 is discharged from the filling pipe 22 to the downstream side through the discharge pipe 21. By discharging the water in the filling pipe 22, a pressure difference is generated between the water in the dam lake 30 and the filling pipe 22. Due to this pressure difference, the water stop lid 51 is pressed toward the filling pipe 22 side. Thereby, the upstream opening 22a is closed by the water blocking lid 51 (blocking step). The water in the refilling pipe 22 is discharged and the upstream opening 21a is closed, so that the inside of the discharge pipe 21 becomes a dry environment. Therefore, the operator can appropriately perform maintenance in the gate 23 and the discharge pipe 21.

  After the maintenance, the operator closes the main valve 24 and then opens the opening / closing part 51a of the water blocking lid 51 as shown in FIG. Thereby, the water of the dam lake 30 is supplied to the filling pipe 22 via the opening / closing part 51a and is accumulated. Thereby, the pressure difference between the water of the dam lake 30 and the inside of the filling pipe 22 reduces (water filling process).

  Thereafter, the operator moves the moving device 40 away from the bank body 10 in a state where the pressure difference is reduced. By this movement, the moving device 40 and the water stop lid 51 are integrally separated from the bank body 10, and the water stop lid 51 is removed from the upstream opening 22a. Thereby, the upstream opening 22a is opened (opening step). After removing the water stop lid 51, the operator pulls up the moving device 40 and collects the water stop lid 51.

  Conventionally, when the water in the discharge pipe 21 in the dam 100 where a spare gate is not provided is drained, the diver holds the water stop cover 50 and dives into the water of the dam 100, and attaches the water stop cover 50 to the upstream opening 21a. It was being blocked. Similarly, when draining the water in the filling pipe 22, the diver is diving in the water of the dam 100 with the water stop lid 51, and the water stop lid 51 is attached to the upstream side opening 22 a to close the water. It was. In the underwater construction method by a diver, the deeper the diver dive, the shorter the time available for underwater work. For this reason, in order to reduce the depth at which divers dive, the gate 23 is opened and the water in the dam lake 30 is discharged, or a plurality of divers are diving in turn.

  However, when performing discharge for reducing the water depth, a long time is required for the discharge operation. Moreover, when a diver dives deeply, it takes a long time for the diver to rise after work. Thus, in the underwater construction method by a diver, the time required for the work becomes long. In addition, since a facility such as a re-pressure chamber used when the diver ascends is necessary, it is a large-scale work.

  On the other hand, according to the present embodiment, the moving device 40 is used when the water stop lid 50 is disposed and removed from the upstream opening 21 a of the discharge pipe 21, for example, the water level of the dam lake 30. There is no need to adjust the working environment to suit divers. Moreover, it is not necessary to consider the time for the diver to ascend, and equipment such as a re-pressure chamber is not required. Thereby, work time can be shortened and it becomes possible to arrange | position the water stop lid | cover 50 without requiring a large installation.

  Further, according to the present embodiment, since the moving device 40 is used when the water stop lid 51 is disposed and removed from the upstream opening 22 a of the water filling pipe 22, the diving is similar to the closing of the discharge pipe 21. There is no need to adjust the work environment to suit the technician, and no equipment such as a re-pressure chamber is required. Thereby, work time can be shortened and it becomes possible to arrange | position the water stop lid | cover 51, without requiring large equipment. In addition, when the water-stopping lid 51 is provided with an opening / closing part 51a and the closed state by the water-stopping cover 51 is opened, the opening / closing part 51a can be opened to efficiently supply water to the filling pipe 22.

  The waterstop construction method according to the present embodiment is, for example, a depth at which a diver needs to dive, that is, a depth from the water surface of the dam lake 30 to the upstream opening 21a is about 50 to 100 m. It is preferable to carry out at a water level or higher. Thereby, the effect at the time of using the moving apparatus 40 becomes still larger. Moreover, even if the diver is difficult to dive, it is possible to dispose the moving device 40 and dispose the water stop lid 50.

  The technical scope of the present invention is not limited to the above-described embodiment, and appropriate modifications can be made without departing from the spirit of the present invention. For example, as shown in FIG. 12, a reserve gate 26 may be provided on the upstream side of the discharge pipe 21. The spare gate 26 can open and close the upstream opening 21 a of the discharge pipe 21. When the maintenance of the gate 23 is performed, the discharge pipe 21 can be in a dry environment by closing the upstream opening 21a by the spare gate 26. In addition, a preliminary gate is not provided on the upstream side of the filling pipe 22. In such a case, the filling pipe 22 is closed by the water stop lid 51 in a state where the upstream opening 21 a of the discharge pipe 21 is closed by the preliminary gate 26. Thereby, it can prevent reliably that the water of the dam lake 30 flows into the discharge pipe 21, and can make the inside of the water filling pipe 22 into a dry environment reliably.

  In the above-described embodiment, the moving device 40 has been described by taking an underwater vehicle as an example, but is not limited thereto. FIG. 13 is a diagram illustrating an example of the moving device 70 according to the modification. As shown in FIG. 13, for example, an underwater crawler may be used as the moving device 70. The moving device 70 includes a main body 71, an endless track 72, and an arm 73. The moving device 70 is connected to the operation device 76 of the carriage 60 by a wiring 75. The moving device 70 can move up and down on the wall surface 12 of the bank body 10 by the endless track band 72. The arm 73 holds the water stop lid 50. The arm 73 can adjust the holding position of the water blocking lid 50. In FIG. 13, it is adjusted to the holding position when the water stop lid 50 is disposed so as to cover the upstream opening 21a. When the water stop lid 50 is held and moved, the water stop lid 50 can be held away from the wall surface 12 by, for example, bending the arm 73 in the direction indicated by the white arrow in FIG. Since the moving device 70 can move along the wall surface 12 by the endless track band 72, the moving device 70 can move more stably than the moving device 40.

  FIG. 14 is a diagram illustrating an example of a dam 200 according to a modification. The moving device 70 can also be applied to a tunnel type dam 200 as shown in FIG. The tunnel-type dam 200 has a horizontal hole 201 formed therein. A discharge pipe 202 for discharging the water of the dam lake 30 is formed on the downstream side of the horizontal hole 201. In the dam 200, the horizontal hole 201 and the discharge pipe 202 are used as pipes at the time of discharge. A gate 123 is provided in the downstream opening 202 b of the discharge pipe 202.

  When performing maintenance of the gate 123, the inside of the discharge pipe 202 needs to be in a dry environment. In this case, the operator opens the gate 123 after closing the downstream opening 202b of the discharge pipe 202 with the water stop lid 50, and discharges the water in the discharge pipe 202. Here, when closing the upstream opening 202b with the water blocking lid 50, the operator first lowers the moving device 70 from the carriage 60 to the horizontal hole 201 using a launcher (not shown) or the like. At this time, for example, the vertical hole 203 connected to the horizontal hole 201 may be routed.

  After the moving device 70 reaches the bottom of the horizontal hole 201, the operator moves the moving device 70 to the back side of the horizontal hole 201 by the endless track band 72. After the moving device 70 reaches the discharge pipe 202, the arm 73 is extended, and the water stop lid 50 is disposed so as to cover the upstream opening 202a of the discharge pipe 202. Thereafter, by opening the gate 123, a pressure difference is generated between the inside of the horizontal hole 201 and the inside of the discharge pipe 202, and the water stop lid 50 is pressed toward the discharge pipe 202 side. Thereby, the upstream opening 202a of the discharge pipe 202 can be closed. Moreover, when removing the water stop cover 50, water may be supplied to the discharge pipe 202 by a water filling mechanism (not shown) to reduce the pressure difference between the horizontal hole 201 and the discharge pipe 202. Moreover, the water stop lid | cover 51 provided with the opening-and-closing part 51a as described in the said 2nd Embodiment may be used.

  In the underwater construction method by a diver, the difficulty of work increases as the length of the side hole 201 increases. On the other hand, in the example shown in FIG. 14, since the work is performed by the moving device 70, it is difficult to increase the difficulty of the work even if the length of the horizontal hole 201 is longer than the work by the diver. In addition, it may replace with the moving apparatus 70 and the moving apparatus 40 as described in the said embodiment may be used.

10 dam body 11 operation room 12 wall surface 20 discharge facility 21, 202 discharge pipes 21a, 22a, 202a, 202b upstream opening 21b, 202b downstream opening 22 filling pipe 22b connection opening 23, 123 gate 24 main valve 25 sub Valve 26 Preliminary gate 30 Dam lake 40, 70 Moving device 41, 71 Main body portion 42 Propulsion force generating portion 43, 73 Arm 44 Imaging device 45, 75 Wiring 46, 76 Operation device 50, 51 Water blocking lid 51a Opening / closing portion 60 72 Endless Track 100, 200 Dam 201 Horizontal Hole 203 Vertical Hole

Claims (8)

A water stopping lid construction method for closing an upstream opening that is opened on the water side of the dam among piping provided in a water discharge facility stored in the dam with a water stopping lid,
An arrangement step of holding the water stop lid on a moving device movable in water, and using the moving device to dispose the water stop lid at a position covering the upstream opening of the pipe filled with water; ,
With the water stop lid disposed at a position covering the upstream opening, water in the pipe is drained from the downstream side of the pipe, and the stop is caused by a pressure difference generated between the water in the dam and the pipe. A water stop lid construction method comprising: a closing step of closing the upstream opening by pressing the water lid toward the pipe side. The water stop lid construction method according to claim 1, wherein the placement step is performed in a state where a depth from a water surface of the dam to the upstream opening is equal to or greater than a predetermined depth. The water blocking lid construction method according to claim 1, wherein the closing step is performed in a state where the moving device holds the water blocking lid. The water stop as described in any one of Claims 1-3 which further includes the removal process which makes the said moving apparatus remove | separate from the said water stop lid | cover of the state which closed the said upstream opening part after the said obstruction | occlusion process. Cover construction method. After the closing step, water is supplied into the pipe blocked by the water stop lid, and a water filling step for reducing a pressure difference between the water in the dam and the pipe;
5. The opening step of removing the water stop lid from the upstream opening using the moving device in a state where the pressure difference is reduced, and opening the upstream opening. The waterstop construction method as described in any one of them. The pipe has a discharge pipe for discharging the water, and a charging pipe for supplying water to the discharge pipe,
The water stop lid is used to block the discharge pipe,
The water stop lid construction method according to claim 5, wherein the water filling step is performed using the water filling pipe. The pipe has a discharge pipe for discharging the water, and a charging pipe for supplying water to the discharge pipe,
The water stop lid is used for closing the water filling pipe, and has an opening / closing part that can be opened and closed in a state where the water filling pipe is closed,
The water stop lid construction method according to claim 5, wherein the water filling step is performed by opening an opening / closing part of the water stop lid. A preliminary gate capable of opening and closing the discharge pipe is provided on the upstream side of the discharge pipe,
The water stop lid construction method according to claim 7, wherein the placement step and the closing step are performed in a state where the upstream side of the discharge pipe is closed using the spare gate.

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