1、 The Three Gorges Projects First. The dam site and basic pivot disposal The Three Gorges Projects is select to be fixed on San Dou Ping in Yichang, located inabout 40 kilometers of the upper reaches of key water control project of Ge Zhou Ba which was built. River valley, district of dam site, is wi
2、den, slope, the two sidesof the bank is relatively gentlely. In the central plains have one island (island, fort of China,), possess the good phased construction water conservancy diversion condition. The foundation of pivot building is the hard and intact body of granite. Have built Yichang and gon
3、e to stride bridge that place of 4 kilometers in the about 28 -km-long special-purpose expressway of building site and dam low reaches -West Yangtze Bridge of imperial tomb. Have also built the quay of district of a batch of dams. The dam district possesses the good traffic condition. Two. Important
4、 water conservancy project buildings 1. dam The dam is a concrete gravity dam, which is 2309 meters long, its height is 185 meters , the dam is 181 meters high the most. Release floodwater dam section lie riverbed, 483 of the total length, consist of 22 form hole and 23 release floodwater in the dee
5、p hole, among them deep hole is imported 90 meters , the mouth size of hole is 7*9 meters； Form hole mouth is 8 meter wide, overflow weir is 158 meters, form hole and deep hole adopt nose bank choose, flow way go on and can disappear. Dam section lies in and releases floodwater on a section of both
6、sides of the dam in the hydropower station, there are hydropower stations that enter water mouth. Enter water mouth baseplate height 108 meters. Pressure input water pipeline for carry person who in charge of, interior diameter 12.40, adopt the armored concrete to receive the strength structure. Mak
7、e and let out flow of 102500 cubic meters per second the most largely in the dam site while checking the flood. 2. power stations The power stations adopt the type after the dam to assign the scheme, consist of two groups of factory buildings on left, right and underground factory building altogethe
8、r. Install 32 sets of hydroelectric generating set together, 14 factory buildings of left bank among them, 12 factory buildings of right bank, 6 underground factory buildings. The hydraulic turbine, in order to mix the flowing type, the specified capacity of the unit of the unit is 700,000 kilowatts
9、. 3. open up to navigation building The open up to navigation buildings include permanent lock and ship lift (of the the technological public relations, the steel cable that plans to be replaced with spiral pole technology in the original plan promotes technology), lie in the left bank. Permanent lo
10、ck double-line five continuous chain of locks. Single grades of floodgate room effective size for 280*34*5, can pass the 10,000 ton-class fleet. The promoting type for single track first grade vertically of the ship lift is designed, it is 120*18*3.5 meters to bear the effective size of design of ra
11、ilway carriage or compartment of ship, can pass a combination vessel of 3000 tons once. Total weight is 11800 tons to bear the design of railway carriage or compartment of ship when operating, it is 6000 newtons to always promote strength. Three.The major project amount and arranges in time limit Th
12、e subject building of the project and major project amount of the water conservancy diversion project are: Excavate 102,830,000 cubic meters in cubic metre of earth and stone, fill out and build 31,980,000 cubic meters in cubic metre of earth and stone, concrete builds 27,940,000 cubic meters, 463,0
13、00 tons of reinforcing bars, make and fit 32 with hydroelectric generating set. All project construction tasks were divided into three stages and finished, all time limit was 17 years. The first stage (1993-1997 year) is preparation of construction and the first stage of the project, it takes 5 year
14、s to construct, regard realizing damming in the great river as the sign. The second stage (1998-2003 year) is the second stage, it takes 6 years to construct, lock as initial conservation storage of the reservoir, the first batch of aircrews generate electricity and is open up to navigation with the
15、 permanent lock as. The third stage (2004-2009 year) is the third stage of the project, it takes 6 years to construct, regard realizing the sign all aircrews generate electricity and finish building with all of multi-purpose project as. One, two project finish as scheduled already, the third stage o
16、f the project in inside the plan to construct too, ship lift tackle key problems of not going on intensely. Four. Enormous benefit of the Three Gorges Projects The Three Gorges Projects is the greatest water control project in China ,also in the world , it is the key project in controlling and devel
17、oping the Changjiang River. The normal water storage level of the Three Gorges Projects reservoir is 175 meters, installed capacity is 39,300 million cubic meters； The total length of the reservoir is more than 600 kilometers, width is 1.1 kilometers on average； The area of the reservoir is 1084 sq.
18、 km. It has enormous comprehensive benefits such as preventing flood, generating electricity, shipping,etc. 1. prevent flood Primary goal of building the Three Gorges Projects is to prevent flood . The key water control project in Sanxia is the key project that the midstream and downstream of the Ch
19、angjiang River prevent flood in the system. Regulated and stored by the reservoir of Sanxia, form the capacity of reservoir in the upper reaches as river type reservoir of 39,300 million cubic meters, can regulate storage capacity and reach 22,150 million cubic meters, can intercept the flood came a
20、bove of Yichang effectively, cut down flood crest flow greatly, make Jingjiang section prevent flood standard meet, improve from at present a about over ten years to once-in-a-hundred-year. Meet millennium first special great flood that meet, can cooperate with Jingjiang flood diversion partition ap
21、plication of flood storage project, the crushing calamity of preventing the occurrence of both sides of section of Jingjiang and bursting in the main dike, lighten midstream and downstream losing and flood threat to Wuhan of big flood, and can create conditions for administration of Dongting Hu dist
22、rict. 2. generates electricity The most direct economic benefits of the Three Gorges Projects is to generate electricity . Equilibrate the contradiction that contemporary China develops economic and serious energy shortage at a high speed, the hydroelectric resources that a clean one can be regenera
23、ted are undoubtedly optimum choices. The total installed capacity of power station of Sanxia is 18,200,000 kilowatts, annual average generation is 84,680 million kilowatt hours. It will offer the reliable, cheap, clean regenerated energy for areas such as East China, Central China and South China of economic development, energy deficiency,etc.It play a great role in economic development and
