Project overview: Mianzhu Pumped Storage Power Station is located in Lutang Town and Guangji Town, Mianzhu City, Deyang City, Sichuan Province. The station site is about 16 km away from Mianzhu City, about 30 km away from Deyang City and about 70 km away from Chengdu City. It is close to the load center and has convenient external transportation. Mianzhu Pumped-storage Power Station is close to the main power grid of Sichuan Province. It is surrounded by several 500kV substations such as Shifang (about 25km) and Danjing (about 30km) and several 220kV substations, with convenient access to the grid. The installed capacity
of Mianzhu Pumped-storage Power Station is 1,200,000kW (4 × 300,000kW), which is a first-class large (1) type project. The main structures of the pivotal project are composed of the upper reservoir, the lower reservoir, the water conveyance system, the underground powerhouse, the switch station and the water replenishment system. When it is completed, it will supply power to the Sichuan power grid. It can play the role of peak shaving, valley filling, energy storage, frequency modulation, phase modulation and emergency reserve in Sichuan power grid to ensure the safe and stable operation of Chengdu load center power grid. Among them, the main construction contents of the project include but are not limited to:
(1) Upper reservoir: it is located in "yuanbao Mountain", a depression in the back hill of Lutang Town. It is dammed at four low passes of "yuanbao Mountain". The reservoir basin is half excavated and half filled. The normal water level is 1197 m, the dead water level is 1174 m, and the design flood level is 1197.80 m. The check flood level is 1198.00 m, and the regulating storage capacity is 6.33 million m3. The main structures of the upper reservoir are composed of retaining dam, water inlet/outlet, reservoir bank and anti-seepage structure at the bottom of the reservoir. The pass retaining dam on the south side of the upper reservoir is the main dam, and the east, north and west pass retaining dams are the auxiliary dams. The main and auxiliary dams are all reinforced concrete face rockfill dams. The crest elevation of the main and auxiliary dams is 1201 m, and the crest width is 10 m. The maximum dam height of the main dam is 69 m, the maximum dam height of the auxiliary dam 1 # is 41 m, and the maximum dam height of the auxiliary dam 2 # is 46 m. The upstream dam slope is 1: 1.5. Downstream dam slope 1: 1.7. The upper reservoir is provided with a road around the reservoir, with a pavement elevation of 1201 m, a pavement width of 6 ~ 10 m, and a total length of about 2073 m. The upper reservoir adopts the whole reservoir basin seepage control, in which the reinforced concrete face slab is used around the reservoir and the geomembrane seepage control scheme is used at the bottom of the reservoir.
(2) Water conveyance system: it is mainly composed of upper reservoir inlet/outlet, upper diversion adit, primary diversion shaft, middle diversion adit, secondary diversion shaft, lower diversion adit, diversion steel bifurcation, diversion steel branch pipe, tailrace branch pipe, tailrace bifurcation, tailrace surge chamber, tailrace tunnel, lower reservoir inlet/outlet, etc. The total length of the water conveyance system is about 2214.08 m ~ 2216.52 m, of which the length of the water diversion system is about 1399.18 m ~ 1434.25 m, and the length of the tailrace system is about 779.83 m ~ 817.34 m. The distance-height ratio of the power station is 3.3.
(3) Underground powerhouse and switch station: The underground powerhouse is located in the middle of the water transmission line, with a horizontal distance of 790m and 560m from the upper and lower reservoirs respectively, and a vertical buried depth of about 429 ~ 393m. The main and auxiliary power houses, the main transformer chamber and the tail gate chamber are arranged in parallel, and the power house axis is N30 ° W. The excavation size of the main and auxiliary powerhouse is 183.0m × 26.5/24.4m × 57.5m (L × W × H), the excavation length of the main transformer chamber is 162.0m × 20.8 m × 23.1m (L × W × H), and the excavation size of the tail sluice chamber is 133m × 14.2/13.2m × 32.65m (L × W × H). The 500kV cable is led out in the form of shaft + adit and connected to the ground 500kV switchyard.
(4) Lower reservoir: It is located on the east side of Banyue Mountain, and is reconstructed and expanded into a reservoir by using Qiuniushan Reservoir. The expansion plan is to move the dam axis of the original Qiuniushan Reservoir downstream by about 170 m, with a normal water level of 674 m, a dead water level of 644 m, a design flood level of 676.50 m, a check flood level of 677.20 m, and a regulating storage capacity of 6.33 million m3. The main structures of the lower reservoir are composed of retaining dam, water inlet/outlet, reservoir basin excavation and protection, reservoir bank road, vent pipe and water replenishment works. The retaining dam in the reconstruction and expansion area of the lower reservoir is a reinforced concrete face rockfill dam, the reservoir tail is enclosed by a homogeneous dam, and the face rockfill dam and the homogeneous dam are transited by a concrete retaining wall. The dam crest elevation is 679.50 m, the maximum height of the concrete face rockfill dam is 48.50 m, and the maximum height of the homogeneous dam is 20.5 m. The reinforced concrete face slab and geomembrane at the bottom of the reservoir are used for seepage control in the reconstruction and expansion area of the lower reservoir, and the clay at the end of the reservoir is used for seepage control in the original area of the Qiuniushan Mountain. The lower reservoir is provided with a road around the reservoir, with a pavement elevation of 679.50 m, a pavement width of 6 ~ 10 m, and a total length of about 2407 m. A drainage gallery (3.1m × 2.5m) is arranged in the lower bedrock of the main dam foundation at
the southeast side of the lower reservoir to drain the leakage water at the bottom of the reservoir and the underground water of the mountain on the left bank. The inlet of the vent pipe is arranged at the upstream side of the Sanjian Spring, with an inlet elevation of 644 m. Two DN1200 steel pipes are wrapped with concrete, arranged in a vertical shaft, with a height of about 17 m. At the elevation of 628.5m, the vertical turning is changed into adit layout, which is arranged in combination with the reconstruction of drainage gallery under the dam and embedded in the rock foundation under the dam. It is connected with ball valve and cone valve with a diameter of 1.2m after passing through the dam by plane turning. A stilling basin with a length of 10 m and a width of 9 m is arranged behind the cone valve, and the channel behind the stilling basin is connected with the outlet channel of Sanjianquan.
(5) Electromechanical and metal structure equipment: including procurement, installation, commissioning (including grid test of all power stations), trial operation and performance test of electromechanical equipment and metal structure equipment. It mainly includes the installation of bridge crane, main equipment and auxiliary equipment, main transformer equipment and other electrical equipment, the installation of inlet/outlet gate and hoist of upper reservoir, the installation of inlet/outlet gate and hoist of lower reservoir, etc.
(6) Traffic engineering: mainly including lower reservoir connecting road, upper and lower reservoir connecting road, upper reservoir ring road, lower reservoir ring road, etc. The connecting road of the lower reservoir is about 2.0km long in total, with 7.5m/6.5m wide subgrade/pavement, asphalt concrete pavement and street lighting; the connecting road of the upper and lower reservoirs is about 8.90km long in total, which is newly built without bridge arrangement, with 7.5m/6.5m wide subgrade/pavement, asphalt concrete pavement, and one viewing platform is set along the road; The top elevation of the road around the upper reservoir is 679.50 m, the width of the road pavement is 8 ~ 10 m, and the length of the road around the reservoir is 2073 m. The road on the top of the dam is made of asphalt concrete pavement. Cable trenches are set on the upstream side of the road, street lamps are installed for lighting, and a viewing platform is set along the road; The road around the lower reservoir has a crest elevation of 679.50 m, a pavement width of 8 ~ 10 m and a length around the reservoir of 2407 m. The road on the dam crest is paved with asphalt concrete. Cable trenches are set on the upstream side of the pavement, street lamps are installed for lighting, and a viewing platform is set along the road.
(7) Others: including production auxiliary buildings, secondary decoration (including but not limited to underground powerhouse, access tunnel, ventilation and safety tunnel entrance, switch station, outgoing line shaft, main transformer room, central control room, etc.), construction upper reservoir and lower reservoir management camps, construction traffic works, construction water supply and power supply works, construction communication works, diversion works, Aggregate processing system, concrete production system works (lower aggregate processing system, lower concrete production system, upper concrete production system, etc.), ventilation of underground caverns, closed management of construction areas, etc., forest felling within permanent and temporary red lines, demolition of structures, etc.
Bid winning information:
First place: Power Construction Corporation of China Chengdu Investigation, Design and Research Institute Co., Ltd.
Sinohydro Bureau 6 Co., Ltd.
Sichuan Nengtou Construction Engineering Group Co., Ltd.
China Anneng Group Third Engineering Bureau Co., Ltd.
Sichuan Nengtou Materials Industry Group Co., Ltd.
Bid Price: 5428835800.00 yuan
Second place: China Power Construction Group Zhongnan Engineering Corporation Limited
Sinohydro Engineering Bureau 1 Co., Ltd.
Bid Price: 5466650000.00 yuan
Third Place: Power Construction Group Northwest Engineering Corporation Limited
Tender offer of China Water Conservancy and Hydropower No.3 Engineering Bureau Co., Ltd.
: 5452430000.00 RMB
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