Breakthrough
of Lovsuns Sewer Tunnel TBM in Istanbul
Huge Plan for Wastewater Treatment in Turkey
till 2023
Istanbul (TR)/Toronto (CDN)/Liaoyang (CN),
September 2016.- The Turkish construction company Eferay Yapi Ticaret A.S.
together with the Cana-dian-Chinese Lovsuns Tunneling Canada Ltd. celebrated in
Istanbul the breakthrough of the 3.91 m diameter single shield EPB-TBM for a
wa-stewater tunnel in September 2016. Although the project seems to be a small
one, it is one more important step into a cleaner environment for the bursting
at the seams Metropol City Istanbul.
Large
need of Wastewater Solutions
Turkey is one of the fastest growing markets
for wastewater solutions accor-ding reports of the European Union. The Turkish
Wastewater Treatment Ac-tion Plan 2023 provides that the number of treatment
plants will increase from around 650 in 2015 to more than 2150 in 2023.
Especially the animate Istan-bul region with
more than 16 million people is desperate for solutions and for that reason,
every single meter of a wastewater tunnel is an important step for every
citizen of Istanbul.
Bypass
Tunnel in Zeytinburnu
The 3.91 m diameter EPB Tunnel Boring Machine
from Lovsuns/LNSS is part of this visionary plan and finished the first 2 km
long bypass in Zeytinburnu to discharge the existing system. The aim of the
Ayvali-2 Tunnel is the increase of drainage wastewater capacity of the existing
lines of Bagcilar, Esenler, Gungoren and Zeytinburnu.
The Tunnel will carry the wastewater of these
main hubs of Istanbul to the Yeni Water Treatment Facility. The TBM started in a 21 m deep launch shaft
and broke through into the 12 m deep target shaft after around 9 months boring.
Normally the boring time should be much more shorter, but due to problems with
the muck transporta-tion during the winter processing on the job site was
longer than expected.
The TBM for the Wastewater Tunnel was one of
the first contracts for the Lovsuns Company (former Lovat and now an overseas
subsidiary company of Liaoning Censcience Industry Co. Ltd, LNSS, China based
in Toronto), de-signed by experienced ex-Lovat engineers and manufactured in
the modern Chinese facilities of LNSS.
After one month of assembly, the TBM started
mid of December 2015 to drill the tunnel. The geology found in the area showed
sandstone, siltstone, clay and soil with partially huge groundwater
appea-rance. During the last 150 m drive, grouting to stabilize the ground
helped to prevent higher water ingresses and simultaneously secured the
stabiliy of the buildings on the surface.
Due to these measurements the advance of the
tun-nel was very good. Thanks to the crew and the machine the best shift showed
an advance of 15.6 m, the best daily advance was 31.2 m and in the best week
153 m of the tunnel was driven. The best monthly result occured in April 2016
with 512 m. The regular overburden was between 8 and 40 m, but the last 150 m
before reaching the target shaft, the tunnel passed only 6 m under the
foundations of the nearby housing areas.
After the first breakthrough and disassembly
of the TBM, the machine will be reassembled in the launch shaft in Ayazaga to
drive a second, 7.29 km long discharge tunnel between the existing wastewater
tunnels of Kemerburgaz and Ambarli. Here the ground will be rock and sandstone.
Lovsuns
Tunneling Canada Ltd.
Lovsuns, former Lovat which was sold to Caterpillar,
carried on the Tunnel Boring Business as the wholly owned subsidiary of
Liaoning Censcience Industry Co. Ltd. – LNSS only one month after the
Caterpillar Tunneling as-sets were sold to the Chinese LNSS in November 2014
with the order of the 3.9 m diameter EPB TBM to bore two wastewater tunnels in
Istanbul, Turkey.
"We designed and engineered the
tailormade TBM for Istanbul in Toronto and completely produced it in the
facility in Liaoyang China. That means that we very successfully united the best
practice, knowledge and technology of both companies for the highest advantage
of our customer", explains Hongyu Xue, Managing Director of Lovsuns
Tunneling Canada Ltd. Further
information you may find on www.lovsuns.com
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