dam with powerhouse, spillway and overflow on top

Abstract

This invention discloses a roller-compacted concrete gravity dam with an in-dam powerhouse for water conveyance and power generation, and a top overflow for flood discharge and venting. The gravity dam body, located on both dam abutments, is functionally divided into a water-retaining dam section and a spillway dam section. The spillway dam section consists of a multi-gate overflow dam section with breast walls, a flood discharge dam section, and a water diversion dam section. The overflow dam section features a WES-type weir curve, and transverse joints are incorporated within the dam section. The main powerhouse is located within the spillway dam section, while the auxiliary powerhouse and installation room are located within the water-retaining dam sections on the left and right sides of the main dam, respectively. A turbine generator is housed within the main powerhouse, and the water intake of the water diversion dam section is connected to the turbine generator, converting the potential energy of the water into electrical energy, thus achieving the water diversion and power generation function. The advantages of this invention are that this gravity dam not only meets the needs of power generation, flood control, and sediment removal, but also avoids large-scale excavation and support of the mountains on both banks, reducing project investment and significantly minimizing the impact on the surrounding ecological environment during construction.

Description

Technical Field

[0001] This invention relates to a roller-compacted concrete gravity dam with water conveyance and power generation in the powerhouse and overflow and venting at the top of the dam, belonging to the field of water conservancy and hydropower engineering technology. Background Technology

[0002] In the layout of gravity dams, the location of the dam is often selected based on factors such as river width, head height, and geological conditions. When the river channel near the dam site is relatively narrow, the flow rate is large, and the normal burial depth of the powerhouse is not suitable for tunneling, the existing technology often adopts a gravity dam + bank-side powerhouse layout. Designers will, based on the optimal design scheme, find a location with better geological conditions or reinforce the mountain to build the powerhouse. The former undoubtedly extends the length of the water conveyance tunnel, which is the shortest possible solution. Both solutions will ultimately increase the project investment. Summary of the Invention

[0003] The purpose of this invention is to provide a roller-compacted concrete gravity dam with an in-dam powerhouse for water conveyance and power generation, and a top overflow for flood discharge and venting. By designing an in-dam powerhouse and a top overflow for flood discharge and venting, the building footprint is reduced, making it suitable for narrow and deep river valleys with steep terrain, large floodwater flow, and significant differences in flood and dry water levels. This can greatly save on underground or bank excavation, reduce project investment, and significantly minimize the impact on the surrounding ecological environment during the construction process.

[0004] The technical solution of this invention is a roller-compacted concrete gravity dam with a powerhouse for water conveyance and power generation, and a top overflow for flood discharge and venting. The gravity dam is located between two mountains, with a spillway section in the middle and water-retaining dam sections on both sides. The spillway section consists of an overflow gate section with multiple gate openings and breast wall gates, a flood discharge and venting section, and a water diversion dam section. The gravity dam body is provided with transverse joints. The main powerhouse is located in the spillway section, and the turbine generator unit is placed in the main powerhouse. The main powerhouse and the main transformer tunnel are connected by a busbar tunnel. The auxiliary powerhouse is located in the water-retaining dam section on the left, and the installation room is located in the water-retaining dam section on the right. The water intake is located on the upstream side of the water diversion dam section, and the overflow weir of the overflow gate section adopts a WES-type weir surface curve.

[0005] In the aforementioned roller-compacted concrete gravity dam with water conveyance and power generation in the powerhouse and overflow and flood discharge at the top of the dam, the dam body material is normal concrete, roller-compacted concrete, and modified concrete; Normal concrete is numbered CI, C-II, C-III, C-IV, CV, C-VI, and C-VII, with strength grades of C15, C20, C25, C30, C35, C45, and C25 respectively; aggregate gradations of C-II, C-III, C-IV, C-IV, and C-VII respectively; and frost resistance grades of C-II, C-VI, and C-VII respectively. Normal concrete with CI is used for dam foundation pit and trench backfilling; normal concrete with C-II is used for dam foundation adverse geological treatment, dam abutment slope application, and dam crest structure; normal concrete with C-III is used for… The application areas for the normal concrete are: dam foundation leveling concrete, perimeter of dam openings, stilling basin bottom slab, revetment, and gatehouse frame; the application areas for the normal concrete designated C-IV are: surface gate piers, guide walls, middle opening sidewalls, and precast bridges on the dam crest; the application areas for the normal concrete designated CV are: overflow weir surface and arch gate hinge brackets; the application areas for the normal concrete designated C-VI are: 1.5m thick erosion-resistant concrete on the surface of the surface overflow and guide wall; the application areas for the normal concrete designated C-VII are: foundation cushion concrete within 8m above the foundation surface; the curing period for normal concrete of CI, C-II, C-III, C-IV, CV, and C-VI is 28 days, and the curing period for normal concrete of C-VII is 90 days. Roller-compacted concrete (RCC) is designated as RI, R-II, R-III, R-IV, and RV. The strength grades of RCC with these designations are C25, C20, C25, C20, and C15, respectively. The aggregate gradations are classified as two-stage, two-stage, three-stage, and three-stage, respectively. The frost resistance grades are F200, F200, F50, F50, and F50, respectively. The application area for RCC designated as RI is the upstream and downstream flood control area within 117m above the foundation surface. The seepage and frost-resistant zones include: the upstream and downstream seepage and frost-resistant zones above 117m from the foundation surface in the roller-compacted concrete (R-II) application area; the dam interior within 57m above the foundation surface in the roller-compacted concrete (R-III) application area; the dam interior within 57m to 117m above the foundation surface in the roller-compacted concrete (R-IV) application area; and the dam interior within 117m above the foundation surface in the roller-compacted concrete (RV) application area. The curing age for all roller-compacted concrete is 90 days. The modified concrete is designated as Cb-I, Cb-II, Cb-III, Cb-IV, and Cb-V, with strength grades of C25, C20, C25, C20, and C15 respectively; aggregate gradations of two, two, three, three, and three-graded concrete respectively; and frost resistance grades of F200, F200, F200, F200, and F200 respectively. The application area for modified concrete designated as Cb-I is the upstream and downstream faces of the dam body within 117m above the foundation surface, specifically the area with secondary aggregate gradation, and areas of the bank slope where compaction is inconvenient. The application area for modified concrete designated as Cb-II is the upstream and downstream faces of the dam body within 117m above the foundation surface, specifically the area with secondary aggregate gradation. The application areas for the modified concrete designated Cb-III are: the downstream backfill surface of the dam body's three-graded mix area within 57m above the foundation surface, the areas of the bank slope where compaction is inconvenient, and the areas around other dam openings where compaction is inconvenient; the application areas for the modified concrete designated Cb-IV are: the areas of the dam body's three-graded mix area within 57m to 117m above the foundation surface, the areas of the bank slope where compaction is inconvenient, and the areas around other dam openings where compaction is inconvenient; the application areas for the modified concrete designated Cb-V are: the areas of the dam body's three-graded mix area above 117m above the foundation surface, the areas of the bank slope where compaction is inconvenient, and the areas around other dam openings where compaction is inconvenient; the curing period for all modified concrete is 90 days.

[0006] In the aforementioned roller-compacted concrete gravity dam for water conveyance and power generation in the powerhouse and for overflow and flood discharge at the top of the dam, the dam body of the water-retaining dam section on both sides of the gravity dam is provided with a transverse joint every 20m, starting from the boundary point between the water-retaining dam section and the flood discharge dam section.

[0007] In the aforementioned roller-compacted concrete gravity dam for water conveyance and power generation in the powerhouse and for overflow and flood discharge from the top of the dam, the length of the water-retaining dam section accounts for approximately two-thirds of the total length of the dam body, and the length of the spillway dam section accounts for approximately one-third of the total length of the dam body.

[0008] In the aforementioned roller-compacted concrete gravity dam for water conveyance and power generation in the powerhouse and for flood discharge and venting at the top of the dam, the flood discharge and venting dam section is divided into two parts, which are connected to the water-retaining dam section on the left and right.

[0009] In the aforementioned roller-compacted concrete gravity dam for water conveyance and power generation in the powerhouse and for overflow and flood discharge at the top of the dam, there are two flood discharge dam sections with an overflow dam section with multiple gate openings and breast wall gates and a water diversion dam section in between. The overflow dam section with multiple gate openings and breast wall gates consists of two parts: gate piers and overflow openings, which are arranged alternately with the water diversion dam section. The overflow weir of the overflow dam section adopts a WES-type weir surface curve, and an arc gate is set on the weir crest.

[0010] In the aforementioned roller-compacted concrete gravity dam with water conveyance and power generation in the dam building and overflow and flood discharge at the top of the dam, the main powerhouse is located in the dam body of the spillway section, and is shaped like a city gate. The turbine generator units are installed inside, and a single trolley is installed on the upper part of the units. A technical water supply layer is arranged next to each turbine generator unit.

[0011] In the aforementioned roller-compacted concrete gravity dam with water conveyance and power generation in the dam's internal powerhouse and overflow and flood discharge at the top, the auxiliary powerhouse is located inside the dam's water-retaining section and is shaped like a city gate. Inside, from top to bottom, a low-pressure air compressor, an oil tank, and an oil-water separation device are arranged in sequence. Below the oil-water separation device, oil-water separation wells and water collection wells are arranged side by side.

[0012] In the aforementioned roller-compacted concrete gravity dam for water conveyance and power generation in the dam's internal powerhouse and for overflow and flood discharge from the top of the plant, the installation room is located within the dam body of the dam's water-retaining section. It is shaped like a city gate and consists of five layers, from highest to lowest: the central control layer, the computer layer, the panel layer, the public transformer and shared panel layer, and the relay protection layer.

[0013] In the aforementioned roller-compacted concrete gravity dam with water conveyance and power generation in the powerhouse and the overflow and flood discharge at the top of the dam, the main transformer tunnel is located behind the main powerhouse and is shaped like a city gate. The main powerhouse and the main transformer tunnel are connected by a busbar tunnel, and there is a generator circuit breaker inside the busbar tunnel. An intake is set up upstream of the water diversion dam section, and an inspection gate and a fast gate are set up after the intake. The fast gate is connected to the main power plant's power generation intake by a pipeline.

[0014] The beneficial effects of the present invention are as follows: Compared with the prior art, the present invention has the following advantages: 1. This invention is the first to propose a roller-compacted concrete gravity dam with an in-dam powerhouse for water conveyance and power generation and a top overflow for flood discharge and venting. It deepens and enriches the existing theories in the field of water conservancy and hydropower engineering. It is highly innovative, technologically advanced, economically reasonable, and has far-reaching engineering practical significance and application prospects.

[0015] 2. Hollow dams have relatively spacious cavities and numerous voids. In addition to the main powerhouse, other electrical equipment, including substations and auxiliary powerhouses, can be installed depending on the specific conditions. This can eliminate the constraints of poor geological conditions in the surrounding mountains that prevent the construction of powerhouses, and can also reduce large-scale excavation of the surrounding mountains. This is especially significant in high-altitude and geologically challenging areas.

[0016] 3. The main plant building uses a new type of double-trolley electric bridge crane for lifting equipment. When this type of crane is lifting and rotating, the balance beam can be raised between the two bridge frames of the crane, which can effectively reduce the rail top elevation of the crane, greatly reduce the height difference between the generator floor and the top of the bridge crane rail, reduce the height of the main plant building, and reduce project investment.

[0017] 4. The powerhouse is located inside the dam body, eliminating the need for surge chambers upstream and downstream. Compared to having the powerhouse located outside the dam body, this reduces the need for surge chambers, optimizes construction techniques, shortens the construction period, and reduces project investment.

[0018] 5. The generator circuit breaker can disconnect the main plant from the main transformer tunnel, becoming a controllable disconnection point between the generator and the power grid. It can quickly isolate generator faults and protect power transmission safety.

[0019] 6. The inspection door and quick-access door after the water inlet can be closed when needed to cut off the upstream water supply, which facilitates the maintenance of pipelines and power plants and is more conducive to the control of the power station by the power station staff in the later stage.

[0020] 7. The arc-shaped gate on the top of the weir can resist the large water pressure from upstream without deforming itself. At the same time, it facilitates the power station staff to control the upstream water level. When the upstream water level is high or the downstream needs water, the arc-shaped gate can be opened to release water, accurately control the amount of water discharged, facilitate the staff to control the water level in the reservoir area, and meet people's living needs. Attached Figure Description

[0021] Appendix Figure 1 View of the upstream of the dam; Appendix Figure 2 This is an aerial view of the dam. Appendix Figure 3 This is a cross-sectional view of the water diversion dam section; Appendix Figure 4 This is a cross-sectional view of the spillway section; Appendix Figure 5 This is a cross-sectional view of the factory building.

[0022] Attached reference numerals: 1-1, Normal concrete; 1-2, Roller-compacted concrete; 1-3, Modified concrete; 2, Dam section; 3, Spillway section; 3-1, Overflow outlet dam section; 3-2, Flood discharge outlet dam section; 3-3, Diversion dam section; 4, Transverse joint; 5, Main plant; 6, Auxiliary plant; 7, Installation room; 8, Hydro-generator unit; 9, Main transformer tunnel; 10, Busbar tunnel; 11, Gate pier; 12, Overflow outlet; 13, Arc gate; 14, Trolley; 15, Low-pressure air compressor; 16, Oil tank; 17, Oil-water separation equipment; 18, Oil-water separation well; 19, Collection well; 20, Central control layer; 21, Computer layer; 22, Panel layer; 23, Public transformer and shared panel layer; 24, Relay protection layer; 25, Inlet; 26, Inspection door; 27, High-speed door; 28, Pipeline. Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0024] Embodiments of the present invention: a roller-compacted concrete gravity dam for water conveyance and power generation within the dam's powerhouse and for overflow and flood discharge from the powerhouse top, such as... Figure 1-5 As shown, the gravity dam is located between two mountains. The middle of the dam body is the spillway section 3, and the two sides of the spillway section 3 are the water-retaining dam sections 2. The spillway section 3 consists of the overflow surface gate dam section 3-1 with multiple gate openings and breast wall gates, the flood discharge and emptying gate dam section 3-2, and the water diversion dam section 3-3. The gravity dam body is provided with transverse joints 4. The main powerhouse 5 is arranged in the spillway section 3. The turbine generator unit 8 is placed in the main powerhouse 5. The main powerhouse 5 and the main transformer tunnel 9 are connected by the busbar tunnel 10. The auxiliary powerhouse 6 is arranged in the water-retaining dam section 2 on the left, and the installation room 7 is arranged in the water-retaining dam section 2 on the right. The water intake 11 is arranged on the upstream side of the water diversion dam section 3-3. The overflow weir of the overflow surface gate dam section 3-1 adopts the WES type weir surface curve.

[0025] The gravity dam body materials are normal concrete 1-1, roller-compacted concrete 1-2, and modified concrete 1-3; The normal concrete 1-1 is numbered CI, C-II, C-III, C-IV, CV, C-VI, and C-VII, respectively. The strength grades of the above-numbered normal concrete 1-1 are C15, C20, C25, C30, C35, C45, and C25, respectively; the gradations of the above-numbered normal concrete 1-1 are three-dimensional, two-dimensional, two-dimensional, two-dimensional, two-dimensional, and two-dimensional, respectively; the frost resistance grades of the above-numbered normal concrete 1-1 are F50, F200, F200, F200, F200, F200, and F200, respectively. The application area for normal concrete 1-1 numbered CI is dam foundation pit and trench backfilling; the application area for normal concrete 1-1 numbered C-II is dam foundation adverse geological treatment, dam abutment local adverse slope lining, and dam crest structure; the application area for normal concrete 1-1 numbered C-III is... The application areas for Concrete 1-1 are: dam foundation leveling concrete, perimeter of dam openings, stilling basin bottom slab, revetment, and gatehouse frame; the application areas for the above-mentioned C-IV type of normal concrete 1-1 are: surface gate piers, guide walls, middle opening sidewalls, and precast bridges on the dam crest; the application areas for the above-mentioned CV type of normal concrete 1-1 are: overflow weir surface and arch gate hinge brackets; the application areas for the above-mentioned C-VI type of normal concrete 1-1 are: 1.5m thick anti-erosion concrete on the surface of the surface overflow and guide wall; the application areas for the above-mentioned C-VII type of normal concrete 1-1 are: foundation cushion concrete within 8m above the foundation surface; the curing age for CI, C-II, C-III, C-IV, CV, and C-VI type of normal concrete 1-1 is 28 days, and the curing age for C-VII type of normal concrete 1-1 is 90 days. Roller-compacted concrete (RCC) 1-2 is numbered RI, R-II, R-III, R-IV, and RV. The strength grades of RCC 1-2 with these numbers are C25, C20, C25, C20, and C15, respectively. The gradations of RCC 1-2 with these numbers are two-dimensional, two-dimensional, three-dimensional, and three-dimensional, respectively. The frost resistance grades of RCC 1-2 with these numbers are F200, F200, F50, F50, and F50, respectively. The application area for RCC 1-2 with the number RI is the upstream and downstream flood control area within 117m above the foundation surface. The seepage and frost-resistant zones include: the upstream and downstream seepage and frost-resistant zones above 117m from the foundation surface in the application area of ​​roller-compacted concrete 1-2 (numbered R-II); the interior of the dam body within 57m above the foundation surface in the application area of ​​roller-compacted concrete 1-2 (numbered R-III); the interior of the dam body within 57m to 117m above the foundation surface in the application area of ​​roller-compacted concrete 1-2 (numbered R-IV); and the interior of the dam body above 117m from the foundation surface in the application area of ​​roller-compacted concrete 1-2 (numbered RV). The curing age for all roller-compacted concrete 1-2 is 90 days. The modified concrete 1-3 is numbered Cb-I, Cb-II, Cb-III, Cb-IV, and Cb-V, respectively. The strength grades of these modified concrete 1-3 are C25, C20, C25, C20, and C15, respectively; the gradations of these modified concrete 1-3 are two-dimensional, two-dimensional, three-dimensional, and three-dimensional, respectively; and the frost resistance grades of these modified concrete 1-3 are F200, F200, F200, F200, and F200, respectively. The application area for modified concrete 1-3 numbered Cb-I is the upstream and downstream faces of the dam body within 117m above the foundation surface in the two-dimensional gradation area, and the areas of the bank slope where compaction is inconvenient. The application area for modified concrete 1-3 numbered Cb-II is the upstream and downstream faces of the dam body within 117m above the foundation surface in the two-dimensional gradation area. The downstream face, sections of the bank slope where compaction is inconvenient, and other sections around openings within the dam where compaction is inconvenient; the application area of ​​the modified concrete 1-3 with the number Cb-III is the downstream backfill surface of the dam body's three-graded area within 57m above the foundation surface, sections of the bank slope where compaction is inconvenient, and other sections around openings within the dam where compaction is inconvenient; the application area of ​​the modified concrete 1-3 with the number Cb-IV is the section of the dam body's three-graded area within 57m to 117m above the foundation surface, sections of the bank slope where compaction is inconvenient, and other sections around openings within the dam where compaction is inconvenient; the application area of ​​the modified concrete 1-3 with the number Cb-V is the section of the dam body's three-graded area above 117m above the foundation surface, sections of the bank slope where compaction is inconvenient, and other sections around openings within the dam where compaction is inconvenient; the curing age of modified concrete 1-3 is 90 days.

[0026] The central part of the dam body is filled with roller-compacted concrete 1-2, while the exterior is protected with conventional concrete 1-1 and modified concrete 1-3 for seepage prevention. The unit price of roller-compacted concrete 1-2 is lower than that of conventional concrete 1-1 and modified concrete 1-3. The construction process of using different concretes for different parts of the dam body has the advantages of fast construction, high dam body strength, and low project investment.

[0027] The gravity dam's retaining dam section 2 on both sides has a transverse joint 4 every 20m, starting from the boundary between retaining dam section 2 and spillway section 3. For example... Figure 1 The gravity dam shown has a total length of 125.68m for the left-side retaining section 2. Starting from the intersection of the dam's axis and the transverse section at 000.000m, joints are formed along the dam axis from left to right at intervals of 25.68m, 20m, 20m, 20m, 20m, and 20m. Similarly, the gravity dam has a total length of 154.966m for the right-side retaining section 2. Starting from the intersection of the dam's axis and the transverse section at 417.85m, joints are formed along the dam axis from right to left at intervals of 13.066m, 20m, 20m, 20m, 20m, 20m, 15.10m, and 26.80m. The transverse joints (4) reduce longitudinal constraints on the dam body, accommodating uneven settlement and temperature changes in the foundation during dam operation.

[0028] The length of the dam section 2 is approximately two-thirds of the total length of the dam body, and the length of the spillway section 3 is approximately one-third of the total length of the dam body. The length of the spillway section 3 is set according to the water discharge requirements of the project. The length of the dam section 2 is equal to the difference between the overall length of the dam body and the length of the spillway section. This arrangement can meet the needs of power generation, water storage, and flood discharge of the project.

[0029] The flood discharge and emptying dam section 3-2 is divided into two parts. Figure 1 The spillway and venting section 3-2 shown has a total length of 36.87m, and is located at dam cross sections 125.680m-146.550m and 246.750m-262.750m, respectively, connecting with the water-retaining dam section 2 on the left and right sides. The spillway and venting outlets are set at a relatively low elevation, which lowers the minimum discharge elevation and increases the discharge volume; the outlets are located on the left and right sides of the dam body, which can disperse the impact of the tailrace flow on the downstream energy dissipation and scour prevention structures.

[0030] Between the two flood discharge and venting dam sections 3-2 are the overflow dam section 3-1 with multiple gate openings and breast wall gates, and the water diversion dam section 3-3. The overflow dam section 3-1 with multiple gate openings and breast wall gates consists of two parts: gate piers 11 and overflow vents 12, which are arranged alternately with the water diversion dam section 2. The total length of the gate piers 11 is 39.00m, and they are arranged at dam cross sections 161.850m-174.850m, 190.150m-203.150m, and 217.730m-231.450m. The total length of the overflow orifice 12 is 60.48m, and they are arranged at dam cross sections 146.550m-161.850m, 174.850m-190.150m, 203.150m-217.73m, and 231.450m-246.750m. The overflow weir of the multi-gate overflow orifice section 3-1 with breast wall gate adopts a WES-type weir surface curve, and an arc-shaped gate 13 is installed on the weir crest. The elevation of overflow orifice 12 is higher than that of the flood discharge orifice, which can be used to release water when the water level is high and the discharge volume is small, avoiding excessive impact on the downstream area when the flood discharge orifice is opened during high water levels.

[0031] The main powerhouse 5 is located within the spillway section 3 of the dam, shaped like a city gate. It houses the turbine-generator units 8, with two 550 / 150t single trolleys 14 mounted on top of each unit. A technical water supply layer is located beside each turbine-generator unit 8. The number of turbine-generator units 8 is determined by the power station's power generation needs. The single trolleys 14 on the roof of the powerhouse facilitate the movement and installation of the equipment by staff. When the turbine-generator units 8 are running, the technical water supply layers primarily cool and lubricate the electromechanical equipment, ensuring its normal operation.

[0032] The auxiliary powerhouse 6 is located within the dam body of the main dam section 2, and is shaped like a city gate. Inside, from top to bottom, are arranged a low-pressure air compressor 15, an oil tank 16, and an oil-water separation device 17. Below the oil-water separation device 17, oil-water separation wells 18 and water collection wells 19 are arranged side-by-side. The auxiliary powerhouse 6 houses electromechanical equipment for use by the main powerhouse's turbine generator during operation, serving an auxiliary function.

[0033] The installation room 7 is located within the dam body of section 2 of the dam's water-retaining dam. It is shaped like a city gate and has five layers, from highest to lowest: the central control layer 20, the computer layer 21, the panel layer 22, the public transformer and shared panel layer 23, and the relay protection layer 24. The installation room 7 is used to assemble the main plant's power generation equipment and auxiliary equipment, facilitating equipment installation within the plant, and serving as a room for production scheduling, maintenance, and testing.

[0034] The main transformer tunnel 9 is located behind the main plant 5 and is shaped like a city gate. The main plant 5 is connected to the main transformer tunnel 9 by the busbar tunnel 10. The busbar tunnel 10 contains a generator circuit breaker. An intake 25 is located upstream of section 3-3 of the water diversion dam. The width of the intake 25 section perpendicular to the water flow direction is equal to half the width of the powerhouse unit section. An inspection gate 26 and a high-speed gate 27 are installed downstream of the intake 25. The high-speed gate 27 is connected to the main powerhouse 5 power generation intake via a pipe 28. The two gates downstream of the intake 25 are designed to promptly intercept water intake in case of problems with the power generation equipment, facilitating maintenance by personnel.

[0035] The gravity dam construction of this invention includes the following steps: Step 1: Excavation of the diversion tunnel and storage of excavated material; Step 2: Excavation of bridge abutment slope, storage of excavated material, and reinforcement and stabilization of bridge abutment slope; Step 3: Diversion and embankment construction; Step 4: Cofferdam construction; Step 5: Dam foundation excavation; Step Six: Installation of Building Facilities; Step 7: Dam construction.

Claims

1. A roller-compacted concrete gravity dam for water conveyance and power generation within the dam's internal powerhouse and for overflow and flood discharge from the dam's top, characterized by: The gravity dam is located between two mountains. The middle of the dam body is a spillway section (3), and the two sides of the spillway section (3) are water-retaining dam sections (2). The spillway section (3) consists of a multi-gate overflow outlet dam section (3-1) with breast wall gates, a flood discharge outlet dam section (3-2), and a water diversion dam section (3-3). The gravity dam body is provided with transverse joints (4). The main powerhouse (5) is arranged in the spillway section (3). The turbine generator set (8) is placed in the main powerhouse (5). The main powerhouse (5) and the main transformer tunnel (9) are connected by a busbar tunnel (10). The auxiliary powerhouse (6) is arranged in the water-retaining dam section (2) on the left, and the installation room (7) is arranged in the water-retaining dam section (2) on the right. The intake (25) is arranged on the upstream side of the dam section (3-3). The auxiliary plant (6) is arranged in the dam body of the dam section (2), and is shaped like a city gate. The low-pressure air compressor (15), oil tank (16) and oil-water separation equipment (17) are arranged in order from top to bottom inside. The oil-water separation well (18) and water collection well (19) are arranged side by side below the oil-water separation equipment (17). The installation room (7) is arranged in the dam body of the dam section (2), and is shaped like a city gate. It has a total of five layers, which are arranged in order from high to low as the central control layer (20), computer layer (21), panel layer (22), public transformer and common panel layer (23) and relay protection layer (24). The length of the water-retaining dam section (2) accounts for about two-thirds of the total length of the dam body, and the length of the spillway section (3) accounts for about one-third of the total length of the dam body; The flood discharge and emptying dam section (3-2) is divided into two parts, which are connected to the water-retaining dam section (2) on the left and right sides; Between the two flood discharge and emptying dam sections (3-2) are the overflow surface dam section (3-1) with multiple gate openings and breast wall gates and the water diversion dam section (3-3). The overflow surface dam section (3-1) with multiple gate openings and breast wall gates consists of two parts: gate piers (11) and overflow surface openings (12), which are arranged alternately with the water diversion dam section (3-3). The overflow weir of the overflow surface dam section (3-1) adopts a WES type weir surface curve, and an arc-shaped gate (13) is set on the weir crest.

2. The roller-compacted concrete gravity dam with water conveyance and power generation in the powerhouse and overflow and flood discharge at the top of the dam as described in claim 1, characterized in that: The gravity dam body materials are normal concrete (1-1), roller-compacted concrete (1-2), and modified concrete (1-3). The normal concrete (1-1) is numbered CI, C-II, C-III, C-IV, CV, C-VI, and C-VII, with strength grades of C15, C20, C25, C30, C35, C45, and C25, respectively. The gradations of the normal concrete (1-1) are three, two, two, two, two, two, two, and two-stage, respectively. The frost resistance grades of the normal concrete (1-1) are F50, F200, F200, F200, F200, F200, and F200, respectively. The normal concrete (1-1) numbered CI... 1-1) The application area is for dam foundation pit and trench backfilling; the application area of ​​the above-mentioned normal concrete (1-1) with the number C-II is for dam foundation adverse geological treatment, dam abutment local adverse slope slope and dam crest structure; the application area of ​​the above-mentioned normal concrete (1-1) with the number C-III is for dam foundation leveling concrete, dam internal cavity perimeter, stilling basin bottom slab and revetment and hoisting machine room frame; the application area of ​​the above-mentioned normal concrete (1-1) with the number C-IV is for surface gate piers, guide walls, middle hole side walls and dam crest precast bridges; the application area of ​​the above-mentioned normal concrete (1-1) with the number CV is for overflow weir surface and arch gate hinge brackets; the application area of ​​the above-mentioned normal concrete (1-1) with the number C-VI is for surface overflow surface and guide wall surface 1.5m thick Impact-resistant concrete; the above-mentioned C-VII normal concrete (1-1) is used in the foundation pad concrete within 8m above the foundation surface; the curing age of CI, C-II, C-III, C-IV, CV, and C-VI normal concrete (1-1) is 28 days, and the curing age of C-VII normal concrete (1-1) is 90 days; the roller-compacted concrete (1-2) is numbered RI, R-II, R-III, R-IV, and RV, and the strength grades of the above-mentioned roller-compacted concrete (1-2) are C25, C20, C25, C20, and C15, respectively; the gradations of the above-mentioned roller-compacted concrete (1-2) are two-, two-, three-, three-, and three-graded, respectively; the above-mentioned roller-compacted concrete (1-2) The frost resistance grades are F200, F200, F50, F50, and F50, respectively. The roller-compacted concrete (1-2) designated RI is used in the upstream and downstream seepage prevention and frost resistance zones within 117m above the foundation surface. The roller-compacted concrete (1-2) designated R-II is used in the upstream and downstream seepage prevention and frost resistance zones above 117m above the foundation surface. The roller-compacted concrete (1-2) designated R-III is used within the dam body within 57m above the foundation surface. The roller-compacted concrete (1-2) designated R-IV is used within the dam body within 57m to 117m above the foundation surface. The roller-compacted concrete (1-2) designated RV is used within the dam body above 117m above the foundation surface.The curing age for roller-compacted concrete (1-2) is 90 days. The modified concrete (1-3) is numbered Cb-I, Cb-II, Cb-III, Cb-IV, and Cb-V, with strength grades of C25, C20, C25, C20, and C15 respectively; gradations of the modified concrete (1-3) are two-dimensional, two-dimensional, three-dimensional, three-dimensional, and three-dimensional, respectively; and frost resistance grades of the modified concrete (1-3) are F200, F200, F200, F200, and F200, respectively. The modified concrete (1-3) numbered Cb-I is used in the area of ​​the dam body within 117m above the foundation surface, including the upstream and downstream faces of the two-dimensional gradation area and the sections of the bank slope where roller compaction is inconvenient. The modified concrete (1-3) numbered Cb-II is used in the area of ​​the dam body within 117m above the foundation surface. The application areas for the modified concrete (1-3) designated Cb-III are: the upstream and downstream faces of the secondary gradation zone of the dam body, areas on the bank slope where compaction is inconvenient, and areas around other dam openings where compaction is inconvenient; the application areas for the modified concrete (1-3) designated Cb-III are: the downstream backfill surface of the tertiary gradation zone of the dam body within 57m above the foundation surface, areas on the bank slope where compaction is inconvenient, and areas around other dam openings where compaction is inconvenient; the application areas for the modified concrete (1-3) designated Cb-IV are: areas on the bank slope of the tertiary gradation zone of the dam body within 57m to 117m above the foundation surface where compaction is inconvenient, and areas around other dam openings where compaction is inconvenient; the application areas for the modified concrete (1-3) designated Cb-V are: areas on the bank slope of the tertiary gradation zone of the dam body within 117m above the foundation surface where compaction is inconvenient, and areas around other dam openings where compaction is inconvenient; the curing age for all modified concretes (1-3) is 90 days.

3. The roller-compacted concrete gravity dam with water conveyance and power generation in the powerhouse and overflow and flood discharge at the top of the dam as described in claim 1, characterized in that: The gravity dam is constructed with a transverse joint (4) every 20m, starting from the dividing point between the water-retaining dam section (2) and the spillway section (3).

4. The roller-compacted concrete gravity dam for water conveyance and power generation within the dam building and for overflow and flood discharge from the dam top, as described in claim 1, is characterized in that: The main plant (5) is located in the dam body of the spillway section (3), and is shaped like a city gate. Inside, a water turbine generator set (8) is installed, and a single trolley (14) is installed on the upper part of the unit. A technical water supply layer is arranged next to each water turbine generator set (8).

5. The roller-compacted concrete gravity dam for water conveyance and power generation within the dam building and for overflow and flood discharge from the dam top, as described in claim 1, is characterized in that: The main transformer tunnel (9) is located behind the main plant (5) and is shaped like a city gate. The main plant (5) is connected to the main transformer tunnel (9) by the busbar tunnel (10). There is a generator circuit breaker in the busbar tunnel (10). An inlet (25) is set up upstream of the water diversion dam section (3-3). An inspection door (26) and a fast door (27) are set up after the inlet (25). After the fast door (27), a pipeline (28) is connected to the power generation inlet of the main plant (5).

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