Jinanqiao Dam Explained

Jinanqiao Dam
Location Map:China
Coordinates:26.8089°N 100.4458°W
Country:China
Location:Lijiang City in Yunnan Province
Status:In use
Construction Began:2003
Opening:2010
Dam Type:Gravity
Dam Length:6400NaN0
Dam Height:1600NaN0
Dam Volume:39200000NaN0
Dam Crosses:Jinsha River
Spillway Count:5
Spillway Type:Service, crest openings
Spillway Capacity:149800NaN0
Res Name:Jinanqiao Reservoir
Res Capacity Total:8470000000NaN0
Res Catchment:2374000NaN0
Plant Hydraulic Head:1110NaN0 (max.)
Plant Commission:2010-2011
Plant Turbines:4 x 600 MW Francis turbines
Plant Capacity:2,400 MW

The Jinanqiao Dam or Jin'anqiao Dam (meaning "golden and peace bridge"[1]) is a concrete gravity dam on the Jinsha River 250NaN0 southeast of Lijiang City in Yunnan Province, China. The purpose of the dam is hydroelectric power production and flood control.

Construction

The Jinanqiao project was approved in August 2003 and construction began in 2005. By December of that year, the river was diverted and the construction of the actual dam began in January 2006. By February 2007, the foundation had been excavated and concrete pouring began. In June 2010, the dam's first generator was operational, the last was commissioned in 2011.[2]

Design

The dam is a 1600NaN0 tall and 6400NaN0 long gravity dam composed of 39200000NaN0 of roller-compacted concrete. The dam's crest elevation is 14240NaN0 above sea level and it withholds a 8470000000NaN0 reservoir with a normal storage level of 14180NaN0 ASL. Of the reservoir's storage, 3130000000NaN0 is active or "useful". The dam's spillway consists of five 130NaN0 x 200NaN0 openings which have a maximum flood discharge capacity of 149800NaN0. To prevent scouring, the dam has a stilling basin at the foot of the spillway. The dam's power station sits at its toe and adjacent to the spillway. It is 2130NaN0 long, 340NaN0 wide and 79.20NaN0 high. Four penstocks with a 10.50NaN0 diameter feed the 4 x 600 MW Francis turbine-generators which can discharge up to 6050NaN0 after generation. Each Francis runner has a 60NaN0 diameter.[2]

Because of high seismic activity in the area of the dam, special care was taken during design and construction to prepare the joints and foundation for sliding and tensile stress. Earthquake-resistant steel bars were installed in high-tensile areas, the construction joint was reduced to 2/3 its size and filled with non-woven fabrics along with the incorporation of a grouted joint between the dam and power plant.[2]

See also

Notes and References

  1. Web site: Trip to the Jinanqiao dam site 2009. International Probe. 9 January 2011. 28 July 2018. https://web.archive.org/web/20180728035752/http://www.probeinternational.org/category/image-galleries/trip-jinanqiao-dam-site-2009. dead.
  2. Web site: Cheng-Bin Du. Yong-Wen Hong. Building Jinanqiao Dam . International Water Power and Dam Construction. 9 January 2011. 29 November 2010 . dead . https://web.archive.org/web/20110723052455/http://www.waterpowermagazine.com/story.asp?storyCode=2058309 . 23 July 2011.