Dongjiang-Shenzheng Water Supply
Project between Dongguan City and Shenzhen is an integrated hydropower project
with focus on water supply to Hong Kong and Kowloon and spilling over to the
water supply of Shenzhen as well as irrigation, drainage, power generation and
flood control. It started north in Dongjiang and ended in south Shenzhen River
with a total length of 83 kilometers. It is home to 9 power generation pump
station, 6 river dam and sluice, 2 regulating reservoirs, 2 hydropower
stations, 24.5 kilometers’ manmade channel,
3.5kilometers’ water supply
channel, 47.9 kilometers’ natural river course and bridges The project is
graded top with most of its buildings rated excellent. CGGC is the contractor
of B-II2 section of the project, or Zhangyang Aqueduct with a total length of
1000m. The aqueduct body is U-shaped pretension thin wall with an internal
radius 7m, height 5.4m and thickness of the wall 30cm. The resting support is
the form of A，B,C
and D. The pile foundation is column pile with the radius of the pile 1600mm.
The main works include: earth excavation 63,500m³, earth backfill 66,500m³,
concrete 16,900 m³ and reinforcing steel bar manufacturing and installation
1,408tons. CGGC has received China Construction Engineering Luban Prize 2004
and China Zhantianyou Civil Engineering Prize 2005 for its excellence in the
project.
The east part of the project is
home to 21,955 sections that have been subject to quality evaluation with all
passing the test and 95.1% rated as excellent. All the sections that have been
taken over are rated as excellent. As a saying goes in large hydraulic project,
nine out of ten aqueducts are not water proof. Miraculously, the aqueduct of
this section with a total length of 4 kilometers is seamlessly watertight. As the
Engineer Lin Zhenhui put it, over 20 years’ hydraulic construction experience
told him that it was definitely a miracle for the 24m cross, two storey high,
30cm thick aqueduct carrying 90 flows per second to hang in the sky like a huge
river without even one tiny drop of water falling down.
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