WO2008004305A1

WO2008004305A1 - Method of constructing hydroelectric power generation facility

Info

Publication number: WO2008004305A1
Application number: PCT/JP2006/313582
Authority: WO
Inventors: Hirohikaru Tanaka
Original assignee: Arron Holdings & Co., Ltd.
Priority date: 2006-07-07
Filing date: 2006-07-07
Publication date: 2008-01-10
Also published as: TW200804679A

Abstract

[PROBLEMS] A method of constructing a hydroelectric power generation facility that generates electric power by introducing sea water underground and continuously generates power by pumping the sea water, used for the power generation, by sea water pumping means. [MEANS FOR SOLVING PROBLEMS] The method of constructing a hydroelectric power generation facility has a recess excavation process (10) for excavating a recess (12) at a position a predetermined distance to the land side from a coast end section, a power- generation-room excavation process (20) for excavating a space for a power generation room (100), an inclined-passage excavation process (30) for excavating an inclined passage (31) for a water introduction tube for interconnecting the recess (12) and the power generation room (100), an inclined-passage excavation process (40) for excavating an inclined passage (41) for a water pumping tube for interconnecting the recess (12) and a vertical passage (111) for a communication tube which vertical passage is excavated from the bottom of the power generation room (100), a hydroelectric-generator installation process (50) for installing a hydroelectric generator (110) in the power generation room (100), a tube installation process (60) for installing the water introduction tube (D) and the water pumping tube (Y), a water-pumping-means installation process (70) for installing water pumping means (170) inside the water pumping tube (Y), a water-storage forming process (80) for forming a water storage (PO), and a sea-water introduction process (90) for allowing sea water to flow into the recess (12).

Description

Specification

Construction method of hydroelectric power generation equipment

Technical field

[0001] The present invention relates to a method for constructing a hydroelectric power generation facility, and in particular, a method for applying a hydroelectric power generation facility having a pumping function for generating power by dropping seawater into an underground power generation room and returning the used water to the sea. About.

Background art

[0002] Conventionally, hydroelectric power generation equipment has been proposed that combines the function of pumping seawater into an underground power generation room to perform power generation, and returning used water to the sea (see, for example, Patent Document 1). . The hydroelectric power generation facility described in Patent Document 1 includes a hydro turbine housed in an underground power generation room, a water intake port disposed below the sea surface, a drain port disposed near the hydro turbine, and a tapered water conduit. The inlet is connected to the power generation room, the outlet is located in the sea, and it consists of a tapered pumping pipe and a pumping pump installed in the pumping pipe to return the seawater after power generation to the sea.

[0003] In this hydroelectric power generation facility, a reservoir for storing seawater pumped by a pumping pipe is provided, and the peripheral wall of the reservoir has a height that prevents seawater from flowing into the reservoir space at high tide. A drainage pipe that also exposes the sea surface force at the time of tide is communicated, and an open / close valve is provided in the drainage pipe. The downstream part of the pumping pipe protrudes upward from the sea level of the reservoir, and then goes down until the outlet reaches this sea level. The seawater after power generation rises from the underground power generation room to the reservoir, and the pumped seawater is temporarily stored in the reservoir, and the seawater in the reservoir opens the on-off valve at low tide, so that the drain pipe It is configured to drain into the sea through.

[0004] Patent Document 1: Japanese Patent No. 3687790

Disclosure of the invention

Problems to be solved by the invention

[0005] However, in the hydroelectric power generation facility described in Patent Document 1, a tilt shaft is formed from the bottom of the sea, and a conduit pipe is connected to the tilt shaft, which requires work on the ocean. There was a problem. Also, what means is used to form the underground power generation room, and what means There was a problem that the construction method was unclear, such as whether the water conduit pipe tapered by the For this reason, there was an inconvenience that it was unclear how to build a hydropower facility.

[0006] In view of the above problems, an object of the present invention is to provide a hydroelectric power generation facility that can generate power continuously by drawing seawater into the basement and pumping the seawater after power generation by pumping means. It is to provide a construction method.

Another object of the present invention is to provide a method for constructing a hydroelectric power generation facility that is safe and has high work efficiency without requiring work on the ocean.

Means for solving the problem

[0007] According to the construction method of the hydroelectric power generation facility of the present invention, the above-described problem is that the hydroelectric power is generated by the hydroelectric generator by dropping seawater into the underground power generation room, and the seawater after power generation is returned to the sea by the pumping means. In the construction method of power generation equipment, a recess excavation process in which a recess is excavated so that the bottom is located below the sea surface at a predetermined distance from the coast edge, and a power generation chamber is excavated at a predetermined depth on the predetermined distance from the land. A power generation chamber excavation process, a water conveyance pipe inclined shaft excavation process for excavating a water conveyance pipe inclined shaft that communicates the bottom of the recess formed by the recess excavation process and the power generation chamber formed by the power generation chamber excavation process, and the central force of the recess bottom and the power generation chamber bottom Shaft excavation process for pumping pipes that excavate a tilt pipe for pumping pipes that communicate with a vertical shaft that has been excavated to a predetermined depth, an installation process for hydroelectric generators that install a hydroelectric generator in the power generation room, an inclined shaft for water pipes and an inclined shaft for pumping pipes Below A pipe disposing process for disposing a tapered water conduit and an upwardly tapered pumping pipe; a pumping means disposing process for disposing a pumping means for returning seawater after power generation to the sea inside the pumping pipe; The problem is solved by providing a reservoir formation process for forming a reservoir for storing seawater pumped up by a pipe and a seawater intake process for allowing seawater to flow into the recess by communicating the recess with the sea.

[0008] As described above, in the construction method of the hydroelectric power generation facility according to the present invention, the concave excavation process is performed in which the concave portion is excavated so that the bottom portion is located below the sea surface on the land side a predetermined distance from the coast end. No excavation work on the ocean is required. The power generation room is also excavated on land because it is carried out by a power generation room excavation process that excavates the power generation room to a predetermined depth on the land side for a predetermined distance. [0009] In addition, the onshore force will also be carried out in the inclined pipe excavation process for the conduit pipe, and further, any of the pump pipe inclined shaft excavation process, the hydroelectric generator installation process, the pipe installation process, and the pumping means installation process. It is configured not to be performed on the ocean. For this reason, the present invention does not require purging, crane work boats, earth and sand carrier vessels, etc., which are performed on the ocean, and it is possible to construct hydroelectric power generation facilities in substantially the same process as on land. .

With such a configuration, it is possible to provide a safe and efficient working method for hydroelectric power generation that eliminates the need for work on the ocean.

[0010] In addition, in the pipe installation process, after the downstream part of the pumping pipe protrudes upward from the sea surface, it is formed into a substantially downward u-shape that is curved downward until the outflow port reaches the sea level of the water reservoir. In the construction process, a drain pipe that is equipped with an open / close valve and that also exposes the sea surface force during tides is connected to the lower part of the peripheral wall of the reservoir. In this way, a reservoir is provided in the vicinity of the pumping pipe, and the downstream part of the pumping pipe is once protruded above the sea surface, and then stored in the reservoir so that the outlet is below the sea level. Is returned to the sea at the time of tide, so it can be a hydroelectric power generation facility capable of continuous power generation.

[0011] Further, in the pipe disposing step, it is preferable that the water outlet of the water conduit is disposed in the vicinity of the hydroelectric generator. With this configuration, it is possible to suppress the loss of seawater dropping force from the sea surface and introduce it directly into a hydroelectric generator to perform efficient power generation.

[0012] In addition, in the water reservoir formation process, it is preferable that the peripheral wall of the water reservoir is formed at a height at which seawater does not flow into the water storage space at high tide. With this configuration, even at high tide, the sea level of the reservoir is lower than the sea level at the intake and the sea level difference can be fully utilized.

The invention's effect

[0013] As described above, according to the construction method of the hydroelectric power generation facility of the present invention, a seawater intrusion prevention wall is formed on the recessed sea side by excavating the recessed part on the side of a predetermined distance from the coast end. It is possible to provide a construction method for hydroelectric power generation facilities that can perform the installation work of the power generation room, the water conduit, and the pumping pipe on land where seawater does not enter, and that is safe and efficient.

Brief Description of Drawings

FIG. 1 is an explanatory diagram of a hydroelectric power generation facility according to an embodiment of the present invention. 2] It is explanatory drawing of a recessed part excavation process.

圆 3] It is explanatory drawing of a power generation chamber excavation process.

4] It is explanatory drawing of the resisting excavation process for communicating pipes.

[FIG. 5] An explanatory diagram of a conduit pit excavation process and an excavation process for excavating a shaft pit.

6) It is explanatory drawing of a water reservoir formation process.

FIG. 7 is an explanatory diagram of a transport device forming process for forming a transport device for installing a hydroelectric generator.

圆 8] It is explanatory drawing of a hydroelectric generator arrangement | positioning process.

圆 9] It is an explanatory diagram when the process of drainage pipe installation in the reservoir is completed.

圆 10] It is an explanatory diagram of the construction process of the drainage pipe of the water reservoir.

圆 11] It is explanatory drawing which shows the other example of hydroelectric generator arrangement | positioning.

圆 12] It is explanatory drawing which shows the further another example of arrangement | positioning of a hydroelectric generator.

圆 13] It is explanatory drawing which shows the other example of a power generation chamber excavation process.

圆 14] It is a construction process diagram of hydroelectric power generation equipment.

Explanation of symbols

10 Concave excavation process

11 Bottom

12 Recess

20 Power generation room drilling process

21 Resistance

22

30 Shaft excavation process for water conduit

31 Diversion shaft for water conduit

40 Shaft excavation process for pumping pipe

41 Shaft for pumping pipe

50 Hydropower generator installation process

60 Tube installation process 70 Pumping means installation process

80 Reservoir formation process

81 Bottom

82 Reservoir recess

83 Seawater ingress prevention wall

84 Drain pipe

84a Open / close valve

85 Boundary wall

90 Seawater intake process

100 (100A, 100B) Power generation room

110 (110A, 11 OB) Hydro Turbine (Hydraulic)

111 Communal pipe shaft

120 water intake

121 Door

130 Drain port

131 Water transfer / drainage section

140 Inlet

150 outlet

151 Curved section

160 communication pipe

170 Pumping pump (pumping means)

171 Electric motor

172 screw

180 Elevator for work and inspection

190 Substation

D water conduit

PO water reservoir

Y pumping pipe s Hydro Turbine Hydroelectric Power Generation Equipment

w Sea level at high tide

L Sea level at low tide

DB, YB waterway selector valve

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the members, arrangements, and the like described below can be variously modified within the scope of the present invention, which does not limit the present invention.

Fig. 1 relates to an embodiment of the present invention. Fig. 1 is an explanatory diagram of a hydroelectric power generation facility, Fig. 2 is an explanatory diagram of a recess excavation process, Fig. 3 is an explanatory diagram of a power generation chamber excavation process, and Fig. 4 is for a communication pipe. Fig. 5 is an explanatory diagram of the drilling process for excavating the inclined pipe shaft and pump shaft, Fig. 6 is an explanatory diagram of the water reservoir formation process, and Fig. 7 is for installing the hydroelectric generator. Fig. 8 is an explanatory diagram of the hydroelectric generator installation process, Fig. 9 is an explanatory diagram of the completion of the process excluding the drainage pipe installation of the water reservoir, and Fig. 10 is a water storage reservoir. Fig. 11 is an explanatory diagram showing another example of the installation of the hydroelectric generator, Fig. 12 is an explanatory diagram showing still another example of the installation of the hydroelectric generator, and Fig. 13 FIG. 14 is an explanatory diagram showing another example of the power generation chamber excavation process, and FIG. 14 is a construction process diagram of the hydroelectric power generation facility.

[0017] The method for constructing a hydroelectric power generation facility according to the present invention continuously generates power by drawing seawater into the basement to drive a hydroelectric generator, pumping the seawater after power generation by a pumping means and draining it into the sea. This is the construction method of hydroelectric power generation facilities that can be used.

[0018] First, a hydroelectric power generation facility targeted by the present invention will be described. As shown in FIG. 1, in this hydro turbine hydroelectric power generation facility S, a power generation chamber 100 is provided in the basement, and a hydro turbine (hydroelectric generator) 110 is disposed in the power generation chamber 100.

A water intake 120 is formed at the bottom 11 of the recess 12, and a water discharge port 130 for discharging sea water taken from the water intake 120 to the hydraulic turbine 110 side is formed in the vicinity of the hydro turbine 110.

In addition, an inlet 140 is formed in the power generation chamber 100 through a communication pipe 160 in order to return seawater discharged from the drain 130 to the sea surface side. [0019] Further, from the intake 120 to the drain 130, a water conduit D that is gradually tapered toward the downstream side is disposed. In the vicinity of the intake 120 of the water conduit D, an open / close door 121 for opening and closing the inside of the water conduit D by an unillustrated electric motor is provided. Then, the seawater from which the drainage 130 has also been discharged drives the hydro turbine 110 to generate power, and the generated seawater flows into the inlet 140 through the communication pipe 160. The inflow port 140 communicates with the outflow port 150 on the sea surface side.

[0020] The outlet 150 has a curved portion 151 that once protrudes upward from the sea surface and then curves downward until reaching a predetermined position below the sea surface. From the inlet 140 to the outlet 150, a pumping pipe Y that is gradually tapered toward the outlet 150 is disposed. A pumping pump (pumping means) 170 for returning the seawater after power generation to the sea is provided at a predetermined position of the pumping pipe Y between the inlet 140 and the outlet 150. The pump (pumping means) 170 includes an electric motor 171 and a screw 172.

In FIG. 1, reference numeral 180 is an elevator for work and inspection, reference 190 is a substation, symbol W is the sea level at high tide, and symbol L is the sea level at low tide.

[0022] In this example, as shown in the construction process diagram of the hydroelectric power generation facility shown in FIG. 14, the recess excavation process 10, the power generation room excavation process 20, the conduit dip drilling process 30, and the pumped pipe dip drilling process 40 The hydroelectric generator installation process 50, the pipe installation process 60, the pumping means arrangement process 70, the reservoir formation process 80, and the seawater intake process 90 are provided.

[0023] The recess excavation process 10 in this example is to excavate the recess 12 so that the bottom 11 is located below the sea surface W on the land side by a predetermined distance from the coast end. First, as shown in FIG. In this way, the land is excavated by an unillustrated excavator. The recess 12 is excavated so that the bottom 11 is located several meters below the sea level W on the land side a predetermined distance from the edge of the coast. As for the method of excavation of the recess 12, a method of excavating a shaft using a horizontal shaft excavator after excavating a vertical shaft, a method of excavating using a shaft excavator capable of excavating a large-diameter shaft is adopted. These excavation methods are the same as the excavation method for the power generation chamber 100 described later, and the details will be described in the power generation chamber excavation method.

[0024] By excavating the recess 12 in this way, a part of the land whose height is higher than the sea surface remains between the recess 12 and the sea, and this portion is separated from a boundary wall 85, a water storage recess 82, and seawater described later. Intrusion prevention wall 8 3 (reservoir surrounding wall). As described above, since the concave portion 12 is excavated from the coast end portion to the land side by a predetermined distance, seawater does not enter the concave portion 12.

[0025] The power generation chamber excavation process 20 in this example is for excavating the power generation chamber 100 to a predetermined depth on the land side for a predetermined distance. FIG. FIG. 4 is an explanatory diagram when the power generation chamber 100 is formed by excavating the slag. In the power generation chamber excavation process 20, the power generation chamber 100 is formed at a position several hundred meters below the land 12 a predetermined distance from the recess 12.

As with the recessed excavation method, the power generation chamber excavation method includes a method of excavating the vertical shaft 21 and then excavating the horizontal shaft 22 using a horizontal shaft excavator, a method of excavating using a vertical shaft excavator capable of excavating large diameter shafts, etc. Adopted. It should be noted that the recess excavation step 10 and the power generation chamber excavation step 20 may be performed either first or simultaneously.

[0026] Although the work process and excavation cost are required, as shown in FIG. 13, a vertical excavator capable of excavating a large-diameter shaft is used to form the vertical shaft 21 with a width that forms the power generation chamber 100 as it is. You can also. Compared with the case where the shaft 22 is excavated from the lower part of the shaft 21 after excavating the large shaft 21 and excavating the power shaft 21 that can be divided into the power generation chamber 100 by dividing the lower part of the shaft 21 in this way. , The amount of excavation increases. Although not shown, the power generation chamber 100 can also be formed by using an excavator capable of continuously excavating the vertical shaft 21 and the horizontal shaft 22 from the lower portion of the vertical shaft 21 with one unit.

[0027] An excavator according to the soil quality is used. When excavating the vertical shaft 21, the casing method should be used when excavating soft ground. According to the casing method, the collapse of the pit wall is prevented by press-fitting the casing. As a casing method, for example, a drilling blade is provided at the bottom of the cylindrical casing, and the high-concentration muddy water is discharged to the outer peripheral side of the cylindrical casing while the cylindrical casing is swung or rotated and press-fitted. It is possible to use an excavator that performs excavation while forming a thin film and reducing frictional resistance. However, the present invention is not limited to this, as long as the shaft can be excavated so that the collapse of the well wall is prevented.

[0028] When excavating a rock layer, for example, rock cutting bits are attached to a peripheral surface of an inverted conical rock excavator in a spiral or stepped manner at predetermined intervals. Rotate while pressing the rock cutting bit at the drilling position to end the rock An excavator that excavates by crushing and propelling can be used. However, the present invention is not limited to this, and any method capable of excavating the rock layer such as a method of excavating the ground while rotating a pipe-shaped drill casing equipped with excavating blades together with the excavating blades may be used.

[0029] After excavating the vertical shaft 21, when excavating the horizontal shaft 22 from the lower portion of the vertical shaft 21, the vertical shaft 21 is excavated to a predetermined depth by the vertical shaft excavator as described above, and then the horizontal shaft excavator from the vertical shaft 21 And excavate the side pit 22. A shield excavator can be used as the horizontal excavator.

[0030] When excavating the horizontal shaft 22 on soft ground, an earth pressure shield machine, a muddy shield machine, or the like may be used. As earth pressure type shields, for example, a cutter attached to the front part of a cylindrical excavator body, a propulsion jack for advancing the excavator body, and collected in the space between the excavator body and the excavation wall where the cutter excavated By rotating the cutter head of an excavator equipped with a discharge means for discharging water to the outside, an excavation method in which a face is excavated with a cutter bit can be used. The excavated earth and sand are agitated in the excavation chamber just behind the cutter head defined by the bulkhead. In the earth pressure type shield machine, mud-making material is injected as needed to promote plastic fluidization of excavated soil, and the plastic fluidized soil is discharged to the back of the shield body by a soil removal device such as a screw conveyor. Discharge.

[0031] Further, when excavating soft ground with a very high water content, water is injected into the excavation chamber using a water injection means such as a water pipe, and the excavated earth and sand is in a muddy state to discharge the mud. You can use a sludge-type shield excavator! In the muddy water type shield digging machine, water is injected into the excavation chamber using water injection means such as water pipes, and the excavated sediment is put in the muddy state and discharged to the rear of the shield body by means of mud discharge such as mud pipes.

[0032] When excavating the rock layer, a tunnel boring machine may be used. When excavating hard rock, it is difficult to excavate with this normal cutter bit, so a roller that rotatably supports a cutting roller that cuts the face on a shaft body that is connected to the cutter head at both ends in the axial direction. Often uses bits.

The soil discharged to the rear of the shield body is discharged to the ground through the shaft 21 by means of discharge such as a bucket conveyor or pressure feed. In this way, the power generation chamber 100 is formed by excavating the horizontal shaft using the excavator according to the soil quality and simultaneously performing the segment assembly.

[0033] As shown in Fig. 1, the shaft 21 excavated for the power generation chamber excavation is a work and inspection elevator 180 (after completion) for carrying in members such as the hydro turbine 110 and moving workers. Is used as a shaft for maintenance).

[0034] As shown in FIGS. 1 and 4, in the vicinity of the center of the bottom of the power generation chamber 100, drainage from which the seawater after power generation is discharged from the hydro turbine 110 (not shown in FIG. 4) housed in the power generation chamber 100. A communicating pipe shaft 111 is drilled that vertically communicates the inlet (not shown) and the inlet 140 (not shown in FIG. 4) of the pumping pipe Y. The excavation method described above is used for the excavation method. As will be described later, the segment assembling and wrapping methods are preferably performed on the communication pipe shaft 111, as in the case of the conduit pipe shaft and the pump shaft inclined shaft. For assembling the segment, it is preferable to assemble the segment so that the segment protrudes several meters above the bottom of the power generation chamber 100 in order to dispose the hydro turbine 110, thereby forming the communication pipe 160.

[0035] As shown in FIG. 5, the inclined pipe excavation process 30 of the present example communicates the bottom 11 of the recess 12 formed by the recess excavation process 10 and the power generation chamber 100 formed by the power generation chamber excavation process 20. It is intended to excavate the inclined shaft for the conduit.

[0036] In addition, as shown in Fig. 5, the inclined pipe excavation process 40 of the present example is for a pumping pipe that connects the bottom 11 of the recess 12 and the central pipe 111 for excavating the bottom central force of the power generation chamber 100 to a predetermined depth. It is intended to excavate the tilt shaft.

[0037] As shown in FIG. 5, in this example, the inclined pipe shaft 31 is a downwardly tapered inclined shaft communicating with the bottom 11 of the recess 12 and the power generation chamber 100, and the inclined shaft 41 for the pumped pipe is connected to the bottom 11 of the recessed portion 12. It is an inclined taper with an upward taper shape that communicates with the vertical pipe shaft 111. In addition, although the shape of the inclined shaft 31 for the water conduit and the inclined shaft 41 for the pumping pipe in this example is tapered, it is not limited to this and may be the same diameter. In addition, the inclined pipe excavation process 30 and the inclined pipe excavation process 40 may be performed first or at the same time.

[0038] Regarding the excavation method for the conduit pipe shaft 31 and the pump shaft inclined shaft 41, a tilt shaft excavator that can be excavated by rotating the cutting edge of a bit or the like is installed in the recess 12 and excavated at a fixed distance. After cutting, excavate again by exchanging the cutting edge with one having a different diameter. By repeating this several times, it is possible to excavate the taper shaft 31 and the pump shaft 41. It is also possible to carry out excavation by bringing a shield excavator capable of excavation into the power generation chamber 100 that has already been excavated and starting the excavator from the power generation chamber 100 toward the bottom 11 of the recess 12. In this case, it is possible to excavate a tapered inclined shaft by using a continuously variable widening shield method. In addition, when excavating the inclined pipe conduit 31 and pump shaft 41 with the same diameter at the starting point and the arrival point, excavation is not required because the excavation blade tip need not be replaced. Is possible.

[0039] It is preferable to perform segment assembly simultaneously with excavation in terms of cost.

Furthermore, by using the lapping method for the segment, it is possible to cope with high water pressure and to suppress the deterioration of the segment due to salt damage. By using the lapping method, the outer periphery of the segment can be covered with a waterproof sheet with excellent water-stopping and durability, and can be used as the water conduit D, power generation chamber 100, and pump-up pipe Y as they are. In addition, after excavation, pipes made of FRP or the like may be arranged on the inclined pipe shaft 31 and the inclined pipe pipe 41.

[0040] The water guide pipe D and the water pump pipe Y are arranged in parallel in a state of being separated by a certain distance. Therefore, a communication pipe 160 is provided at the lower part of the power generation chamber 100 so that the drain (not shown) of the hydro turbine 110 and the inlet 140 of the pumping pipe Y communicate vertically! The

The hydroelectric generator installation step 50 in this example is to install a hydroelectric generator (hydraulic turbine 110) in the power generation chamber 100.

As shown in FIGS. 7 and 8, the upper part of the communication pipe 160 to which the hydro turbine 110 is connected is formed to protrude several meters from the bottom of the power generation chamber 100. As for the forming method, as described above, it may be formed by segment assembly simultaneously with excavation, or may be formed after the excavation work is completed. The counter 21 is provided with an elevator 180 for carrying in and inspecting a member such as the hydraulic turbine 110 and moving a worker. The member of the hydraulic turbine 110 is carried into the power generation chamber 100 and connected to the communication pipe 160. Assemble and arrange to connect. The hydro turbine 110 is a water turbine having a moving blade row that is rotatable about a rotation axis, and its shape and size are not limited. In this example, a Pelton turbine having a moving blade row rotatable around a rotation axis This is not limited to this, and Francis turbines, propeller turbines, etc. can be used.

[0042] As shown in FIG. 9, in the pipe disposing step 60 of the present example, the lower tapered water conduit D and the upper tapered water pump Y are disposed on the water conduit inclined shaft 31 and the water pump inclined shaft 41. . In addition, when the segment assembly and lapping method are performed at the same time as excavation of the conduit pipe tilt shaft 31 and the pump shaft tilt shaft 41, the outer periphery of the segment is covered with a waterproof sheet with excellent water-stopping and durability. Can be used as a conduit pipe D and a pump pipe Y.

[0043] Further, the water guide / drain section 131 of the water guide pipe D is disposed so that the drain port 130 is positioned in the vicinity of the hydro turbine 110. The water guide / drain section 131 is connected to the water guide pipe D, but is introduced from the power generation chamber 100 side or carried from the top of the water guide pipe D.

In addition, a curved portion 151 is disposed on the upper portion of the pumping pipe Y. The curved portion 151 has a substantially downward U-shape that protrudes upward from the sea surface of the recess 12 and then the outlet 150 is curved toward the lower portion of the water storage PO. It may be arranged so as to be supported by the boundary wall 85. Note that the conduit pipe D, pump pipe Y, conduit drainage section 131, and curved section 151 can be made by using a metal pipe whose surface is coated with a corrosion-resistant paint or film, a resin pipe reinforced with glass fiber, etc.ヽヽ.

In addition, when the inclined pipe shaft 31 and pump shaft 41 are drilled to the same diameter instead of the tapered shape, the lower tapered water pipe D and the upper tapered pumping water are connected to the horizontal pipe shaft 31 and the vertical pipe shaft 41. If pipe Y is installed, there will be a gap around the conduit D and pump pipe Y. In this case, soil or concrete discharged during excavation is injected to fill the gap, and the conduit D and pump pipe Y are fixed.

In addition, an opening / closing door 121 for opening and closing the water conduit D with an electric motor is disposed in the vicinity of the water intake 120 of the water conduit D. By opening the open / close door 121, seawater flows into the water conduit D from the water intake 120, and power is generated by the flow pressure of the seawater that has dropped onto the hydro turbine 110. In order to reduce damage to the hydro turbine 110 due to foreign matter, filters may be provided at the intake 120 and the conduit D.

[0046] In this example, the conduit D is a throttle pipe with a diameter 120a of the intake 120 located near the sea floor of 5.2m, a diameter b of the outlet 130 of 3m, and a length of 300m. Yes. Inlet 120 Is located at a depth of 5 to LOm from the sea level, so that the intake 120 is maintained below the sea level even at low tide. In this example, the inclination angle Θ of the water conduit D when buried in the soil is 25 °.

[0047] In this example, the pumping pipe Y has a pipe diameter c of the inlet 140 communicating with the communication pipe 160 of 5.

A throttle pipe with a pipe diameter d of 3 m is used for the outlet 150, which is 2 m above the intake 120 and several meters above the intake 120. The inclination angle Θ of the pumping pipe Y in the soil buried condition in this example is 25, the same as the pipe D. It is said. The inlet diameter 120, drain outlet 130, inlet 140, outlet 150, outlet length 150, pipe length (full length), and inclination angle in the buried state are limited to the above values. Is not to be done.

It should be noted that either of the hydroelectric generator installation step 50 and the pipe arrangement step 60 may be performed first or simultaneously.

[0048] The pumping means disposing step 70 of this example is to arrange pumping means for returning seawater after power generation to the sea inside the pumping pipe Y, and inside the pumping pipe Y, A pump 170 is installed to return seawater to the sea. The pumping pump 170 in this example is a force using an axial pump that rotates the screw 172 by the electric motor 171, but is not limited to this, and a spiral pump, an axial pump, a reciprocating pump, or the like can also be used. Further, in this example, the mounting position of the power pump 170 provided with the pump 170 in the substantially central portion of the pump pipe Y is not limited to this. However, the range from the upstream part to the central part of the pumping pipe Y is preferable.

Thus, in this example, the water conduit D is disposed such that the intake 120 is located at the bottom 11 of the recess 12 and the drain 130 is located in the vicinity of the hydroelectric generator (hydraulic turbine 110). The pump pipe Y has a support part (boundary wall 85) supporting a substantially downward U-shaped curved part 151 curved so that the inlet 140 communicates with the power generation chamber 100 and the outlet 150 is several meters below the sea level. It is arranged as follows.

[0050] As shown in FIG. 6, the reservoir formation step 80 of this example forms a reservoir PO that stores seawater pumped by the pumping pipe Y. From the recess 12 formed by the recess excavation step 10 Also form a reservoir PO on the sea side. Reservoir PO excavates reservoir 82 so that bottom 81 is located below the sea level. At this time, the seawater intrusion prevention wall 83 is formed on the most sea side, and the concave A boundary wall 85 is formed at the boundary with the part 12. The boundary wall 85 and the seawater intrusion prevention wall 83 in this example are formed after the pumping pipe inclined shaft excavation process 40, but not limited to this, the concave excavation process 10, the power generation chamber excavation process 20, and the water conduit Any one jet may be used at the same time as the inclined shaft excavation process 30, the pumped pipe inclined shaft excavation process 40, the hydroelectric generator installation process 50, the pipe installation process 60, the pumping means arrangement process 70, etc.

[0051] In this example, a part of the boundary wall 85 is excavated to form a support portion that supports the curved portion 151 of the pumping pipe Y. When the boundary wall 85 is a hard ground such as rock, the boundary wall 85 can be used as a support portion. In the case of soft ground, the boundary wall 85 (support) may be formed from concrete. Then, after protruding upward from the sea level of the recess 12 to the upper part of the pumping pipe Y, the curved part 151 of the substantially downward U-shaped pumping pipe Y curved so that the outlet 150 is several meters below the sea level. It arrange | positions so that it may be supported by the support part which consists of 85.

In addition, as shown in FIG. 7, the seawater intrusion prevention wall 83 described above is formed by excavating the water storage recess 82 and forming the seawater ingress prevention wall 83 on the outer side (sea side). As shown in FIG. 10, a drain pipe 84 that is exposed from the sea surface at the time of tide is disposed directly below the sea surface line L at the time of the tide.

[0053] This drain pipe 84 is for draining seawater discharged to the water storage PO after power generation into the sea, and is provided with an open / close valve 84a. If this operation is performed at low tide, it can be performed without seawater entering. When the seawater intrusion prevention wall 83 is hard ground such as a rock, the seawater ingress prevention wall 83 can be used as it is. In the case of soft ground, it may be molded from concrete. The size of the water storage PO in this example is such that it can store the seawater used for power generation for about one day, but is not limited to this, and can be formed to have a size of more than one day. it can.

In the seawater intake step 90, seawater is caused to flow into the recess 12 by communicating the recess 12 with the sea.

That is, a part of the recess 12 and the sea are communicated by excavation of the coast, and the seawater flows into the recess 12. As a result, seawater can be taken from the intake 120 of the conduit D as shown in Fig. 1 to generate electricity. In addition, the method of flowing seawater into the recess 12 and the method of forming the water reservoir PO are not limited to those described above. For example, the water reservoir PO may be formed near the coast by a concrete block or the like. . A substation is located on the ground directly above the power plant. In the control room of the substation, the operation operation of the hydro turbine 110 and the pumping pump 170, the opening / closing operation of the door 121, etc. are performed.

[0055] It should be noted that a plurality of hydro turbines 110 may be provided in preparation for a case where power generation efficiency or the hydro turbine 110 fails. In FIG. 11, two hydro turbines 110 are provided. The hydro turbines 110A and B are provided in the power generation chambers 100A and B, respectively. The lower part of the water guide pipe D is bifurcated, and a water channel switching valve DB for switching the water channel is disposed at the branched portion. With this configuration, when the hydro turbine 110A fails, the water channel switching valve DB can be switched to flow sea water into the hydro turbine 110B, and power generation can be continued. During this time, the hydro turbine 110A can be inspected and repaired. As the water channel switching valve DB, any known one can be used as long as the water channel can be switched.

[0056] Similarly to the above-described embodiment, the power generation chambers 100A and 100B are each provided with a communication pipe 160 so that the inlet 140 to the pumping pipe Y communicates vertically. It is configured to join at. In addition, a water channel switching valve YB is provided in the middle of the pumping pipe Y to provide a seawater pipe that flows from each communication pipe 160 to the pumping pipe Y.

[0057] Further, as shown in FIG. 12, the power generation chamber 100B is provided below the power generation chamber 100A and substantially on the extension line of the water conduit D, and the seawater discharged by the hydro turbine 110A flows into the hydro turbine 11OB. You may comprise as follows. With this configuration, when the hydro turbine 110A moves normally, the sea water after the power generation by the hydro turbine 110A flows into the hydro turbine 110B, and the surplus seawater discharged from the hydro turbine 110A is used in the hydro turbine 110B. Some power is also generated. In addition, when the hydro turbine 110A does not move due to a failure or the like, the seawater into which the water guiding pipe D force has flowed passes through the power generation chamber 100A and flows into the water bottle 110B. As a result, even when the hydraulic turbine 110A does not move, power can be generated by the hydraulic turbine 110B.

Next, a power generation method using the hydroelectric power generation facility according to the present invention will be described. First, the door 121 is opened according to a command from the substation 190, and seawater is poured from the intake 120 into the conduit D. As a result, seawater passes through the conduit D and is dropped into the underground power generation room 100. At that time, the flow rate of seawater is increased by the throttle pipe structure while passing through the water guide pipe D which is not only the potential energy generated by the height difference between the intake 120 and the drain 130. The seawater dropped at a high speed causes the hydro turbine 110 in the power generation chamber 100 to rotate at almost the maximum rotational speed, thereby generating high output power.

[0059] Seawater after power generation falls vertically in the communication pipe 160 from the power generation chamber 100, and then changes direction and flows into the pumping pipe Y. At this time, seawater ascends in the pumping pipe Y and drains in the storage tank PO due to the pumping power by the pumping pump 170 and the increase in flow velocity by the throttle pipe structure of the pumping pipe Y. In this way, the seawater that has flowed into the pumping pipe Y is supplemented by the action of pumping by the pumping pump 170 and pushed up while being increased by the throttle pipe structure. As a result, it is possible to generate power continuously using only the power used for the pump 170.

[0060] In this example, the outlet 150 of the pump pipe Y is located several meters below the sea surface on the D conduit D side, and further, the seawater of the reservoir PO is drained into the sea at the time of tide. The sea level of the station PO can be made lower than the sea level on the 120 side of the intake pipe intake, enabling continuous power generation.

[0061] In this example, as the conduit D, the inlet 120 has a pipe diameter a of 5.2 m, the drain outlet 130 has a pipe diameter b of 3 m, a length of 300 m, and an inclination angle Θ of 25 °. As a result, high-speed seawater can be sprayed from the drain 130 to the hydro turbine 110, and the water from the drain D 130 of the conduit pipe D is discharged at a speed of 180 to 190kmZh. The As a result, 700,000 kw power generation can be expected.

Claims

The scope of the claims

[1] In the construction method of hydroelectric power generation equipment that generates power by a hydroelectric generator by dropping seawater into the underground power generation room and returns the seawater after power generation to the sea by pumping means,

A recess excavation process for excavating the recess so that the bottom is located below the sea level on the land side a predetermined distance from the coast edge;

A power generation chamber excavation step of excavating the power generation chamber to a predetermined depth on a predetermined distance land side;

A conduit pipe excavation step for excavating a conduit conduit for connecting the recess bottom formed by the recess excavation step and the power generation chamber formed by the power generation chamber excavation step; and a predetermined depth from the recess bottom and the center of the power generation chamber bottom A shaft digging process for a pumping pipe for digging a shaft pit for communicating with a drilled shaft,

A hydroelectric generator disposing step of disposing a hydroelectric generator in the power generation chamber;

A pipe disposing step of disposing a tapered pipe having a lower taper and an upper tapered pipe in the inclined pipe for the water pipe and the inclined pipe for the water pump;

A pumping means arranging step for arranging a pumping means for returning seawater after power generation to the sea inside the pumping pipe;

A reservoir formation step for forming a reservoir for storing seawater pumped by the pumping pipe; and a seawater intake step for allowing seawater to flow into the recess by communicating the recess with the sea. The construction method of hydroelectric power facilities.

[2] In the pipe disposing step, after projecting the downstream portion of the pumping pipe upward from the sea surface, the pipe has a substantially downward U-shape curved downward until the outlet reaches below the sea surface of the water reservoir. 2. The construction method of a hydroelectric power generation facility according to claim 1, wherein, in the site formation step, a drain pipe that is provided with an open / close valve and is exposed from the sea surface at the time of tide is communicated with a lower peripheral wall of the reservoir.

[3] The method for constructing a hydroelectric power plant according to claim 1, wherein the drainage port of the water conduit is disposed in the vicinity of the hydroelectric generator in the pipe arranging step.

[4] In the water reservoir formation process, seawater does not flow into the water storage space at the time of high tide! 2. The method for constructing a hydroelectric power generation facility according to claim 1, wherein the hydroelectric power generation facility is formed to have a height of ヽ.