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Türkiye: Metro tunnel segments crack - "Segments use Fiber Reinforced Polymer and Macro Synthetic Fiber"
Turkish newspapers report that the segments used in İzmir Metrosu Narlıdere extension construction crack. Newspapers say the contractor Gülermak use Fiber Reinforced Polymer and Macro Synthetic Fiber in segments instead of steel bars.
Because of this the controller company UBM (Uluslararası Birleşmiş Müşavirler Müşavirlik Hizmetleri A.Ş) summons the main contractor Gülermak for an emergency meeting. At the 18 July meeting, UBM tells Gülermak to use segments with steel bars. It is not clear what will happen to segments already placed in the tunnel.
The Narlıdere metro tunnel is alongside the İzmir bay and known to have a muddy composure.
Turkish newspaper:
https://www.yeniasir.com.tr/izmir/2019/08/29/metronun-tunel-kaplamasi-catladi
This is something which I have seen before even in India and also have seen a situation where 10-12 segment literally jumped out .
I would suggest instead of playing a gaming game of pointing out whose mistake better contractor should think how to rectify this situation as soon as possible .
Obviously whoever designed and produced these tunnel segments have not read the guidance documents of the International Tunnelling Association special interest group ITAtech:
ITAtech Guidance for Precast Fibre Reinforced Concrete Segments - Vol 1 Design Aspects
and
ITAtech Guideline for Good Practice of Fibre Reinforced Precast Segment - Vol. 2 :Production Aspects
Tim, You hint here the contractor Gulermak did not read the book. What is wrong with your assertion is that probably Gulermak has more know how to write better books than these. They are a high standard engineering company.
It is suggested that Gulermak is probably the first in the whole world to produce such segments. Sure something did wrong but they should be congratulated and admired for pushing the envelope and trying new techniques and not be made childish fun.
I see that you are an engineering student. You have a lot to learn, It is so difficult to put theories in practice and it requires witful engineers like at Gulermak.
after reading this and looking back, I now see that my comment above was not fair. My unreserved apologies to gulermak engineers and everybody else who had read my comment.
What is the fuss about?
Such "road accidents" happen in all construction projects. Important thing is that the correcting measures are taken swiftly. Reading the news, this is exactly what is being done.Turks seem to have their system in place with the controller and the contractor are functioning well. By the way, I know the contractor from a project in eastern Europe. They are top-notch in quality and workmanship.
A close friend and colleague of mine has worked in a Dubai metro project. Consortium included Acciona, Gülermak and some other company. My friend was employed by the Spanish company. He told me that the project was a great success largely because of Gülermak's efforts. He said it is a very well organized company with very able managers and engineers.
I already knew that Gülermak is a süperb engineering company. I was sad that some people just made fun of this setback. Dynamic engineering companies go to uncharted places and that is how engineering goes forward. Innovation does not come to "mee-too" workers.
Please people be more fair and engineer-like in your comments next time.
And read this süperb article from TunnelTalk (except unnecessary leaving out link to my article)
First Turkish then English
Az önce şu yazıyı okuduktan sonra olayı anlar gibi oldum.
Soru: Gülermak İzmir Narlıdere tüneli için Bakaert-Maccaferri fiberlerini mi kullandı o kırılan segmentlerde? Kesin olan, fiber satıcıları Gülermak'ta birilerini kandırıp Türkiye'yi deneme tahtasına çevirmiş. Yok efendim segmentler üst üste konulduğu için olmuşmuş şuymuş buymuş. O segmentler her zaman öyle dizilirler. Neden demirli segmentler çatlamıyor da bu fiber segmentler çatlıyor?
Eğer Gülermak gerçekten iyi bir şirketse, bu işin üzerine gitmeli. Kim Türkiye'yi neden Belçikalı İtalyanların deneme tahtası durumuna getirmiş araştırmalı, açıklamalı. Öncelikle İzmir Büyükşehir belediyesi bu işin üzerine gitmeli. Kim daha denenmemiş teknolojileri İzmir'lilerin yaşamlarını riske atarak deniyor araştırıp bulmalı. Bir suç varsa Gülermak'a ağır bir yaptırım uygulamalı, tünel işini Gülermak'tan almalı.
Gülermak o tünel yapımında, denenmemiş başka uygulamalar kullanıyor olabilir mi?
Bu olayı öyle fiber üreticisi tekellerin reklam kaygısındaki yabancı dergilerin saçma açıklamaları ile mi geçiştireceğiz? Türkiye'de mühendislik daha ciddiye alınır!
Türklerin canı Belçikalıların, İtalyanların canlarından daha az değerli değil!
I read this
My question= Did Gülermak use fibers of Bakaert-Maccaferri for crack segments in İzmir Narlıdere metro tunnel? It is certain some fiber seller fool some Gülermak people to make Turkey a trial testbed. I don't believe these bullshit explanation "misalignment stacking". Segments always stack that way. Why iron segments not crack?
Maybe that journal worried about fiber factories advertisements and with so unbelievable explanation but in Turkey we take construction engineering very serious.
If serious organization, Gülermak must investigate why this happen. Foremost İzmir Municipality must investigate. If necessary must penalize Gülermak. If necessary take tunnel contraction away from Gülermak. What other untested technology Gülermak may use in İzmir?
Turkey is not test ground for untested technologies. Lives of Turks as important as lives of Belgium and Italy people.
İzmir Municipality's Narlıdere metro progress: #Gülermak completes the boring of 860 meter part between 2 stations in 1,5 months. Narlıdere complete length is 7,5km
https://www.haberimport.com/izmir-narlidere-metrosunda-iki-istasyon-birlesti-17476.html
#izmir #tunnels
İngiltere'nin HS2 projesinde de segmentler çatlamış
ama bizden farkı, segmentleri üreten kuruluşun başı, işinden olmuş
İzmir Narlıdere metrosunu bir kimya kuruluşunun deneme tahtasına çeviren her kimse, işinden ayrılmak zorunda kaldı mı?
#Roberto What Mustafa says is; after HS2 segments crack, segment supplier CEO resign. Anybody resign after segment crack in İzmir Metro? Gülermak had used unsual "Fiber Reinforced Polymer and Macro Synthetic Fiber in segments instead of steel bars".
Anybody know?
Has supplier of such chemıcals to Gülermak apologized?
Personally I think not.
cover tunnel photo by: Matt Brown from London, England / CC BY
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Fault of subcontractor for segments