prof. dr. fevzİ yilmaz fatih sultan mehmet vakıf university, faculty of engineering, İstanbul...
DESCRIPTION
Family of construction techniques for installing or rehabilitating underground infrastructure with minimal disruption to surface traffic, businesses, and residents Underground building industry has social economical and environmental costs Underground buildings have 4D facts: Dirtiness, Difficulty, Dangerous, Dust.TRANSCRIPT
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PROF. DR. FEVZİ YILMAZFatih Sultan Mehmet Vakıf University,Faculty of Engineering, İstanbul
ICSG ISTANBUL 2015, 29-30 APRIL
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WHAT IS TRENCHLESS TECHNOLOGY (TT)?
OUT OF SIGHT OUT OF MIND
TRENCHLESS TECHNOLOGY METHODS◦ Detection Methods and Assesments◦ To Go From Trenching To Trenchless
TRENCHLESS TECHNOLOGIES IN ISTANBUL
CONCLUSION
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Family of construction techniques for installing or rehabilitating underground infrastructure with minimal disruption to surface traffic, businesses, and residents
Underground building industry has social economical and environmental costs
Underground buildings have 4D facts: Dirtiness, Difficulty, Dangerous, Dust.
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Social Cost
«no dig no risk», «minimum dig minimum risk»«TT or no-dig=minimal impact to the ground»
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An example of open cut and no-dig project area
Trench and / or Trenchless
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Underground pipe networks / features > 5 times total length of streets and roads Not visualized People neglect their importance
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Introduction: Mid-1980sTrenchless technology methods are divided
into four main areas: 1. Inspection and detection2. Construction and installation of new pipelines and
utilities3. Renewal4. Replacement of existing, old, and deteriorated pipelines
and utilities
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The usage ratio of open cut (trench) and trenchless rehabilitation methods for sewer pipe networks in advanced countries:
However, in Istanbul open cut ratio is much higher than 50 % in rehabilitation projects
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DETECTION METHODS AND ASSESMENTS(Includes technologies for inspection, leak location, and leak detection)
CCTV (Closed-Circuit Television)
Leak detection
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GPR (Ground Penetrating Radar with a trolley, a laptop and digital antenna driver).
Others:intelligent TV camera systems, pressure tests, smoke tests, fiber optic gyroscopes, georadar utility search and mapping, and void inspection devices
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TO GO FROM TRENCHING TO TRENCHLESS
From Open Trench to Directional Drilling
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HDD (Horizontal Directional Drilling)
1) drilling a guided pilot hole 2) forming a flowable slurry 3) pulling the new pipe (PE,PVC,DI.Steel)
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CIPP (Cured-In-Place Pipe) Stages: 1.old host pipe renewal 2.UV hardening, composite
Micro Tunneling New installation, Pipe jacking
Others: Fold & Form (F&F), Pipe Bursting, Pipe Ramming, Coating and Linings, etc.
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famous ancient city of the world around 20 % of the population in Turkey (~13 million)
40 % of Turkish
industrial activity
located along the shores
of the Marmara Sea and the
Bosporus Strait
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TT methods (Rehabilitations+Renewals+New Installations) widely used in Istanbul:
Cured-in-place Pipe (CIPP)
Fold & Form (F&F)
Pipe Bursting
Horizontal Directional Drilling (HDD)
Micro Tunneling
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CURED-IN-PLACE PIPE (CIPP)
The rehabilitated sewer in front of Hagia Sophia by CIPP methods
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FOLD & FORM (F&F)
The rehabilitated sewer example between Sultanahmet Mosque and Hagia Sophia by F&F methods Stages:1.folded (u-shaped) PVC and HDPE pipe 2.insertion it in the existing sewer 3.rounded by heat (steam) and pressure in existing sewer (tight fit)
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HORIZONTAL DIRECTIONAL DRILLING (HDD)
HDD application on Barbaros Street – Beşiktaş
HDD application on Seyrantepe near the TEM
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PIPE BURSTING
Pipe bursting application site in Beşiktaş
Stages: 1.old host pipe fragmenting 2.new pipe pulling
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TT is a crucial alternative for the construction, renewal and rehabilitation of pipelines
TT is open to nowel approachesTrenchless Technologies are major alternative and offer
many benefits for protecting historical infrastructures either The biggest advantage of trenchless technology is
prevention of negative impacts of open cut system Since 2003, renewal and rehabilitation of pipes especially
wastewater pipes in Istanbul has been realized with trenchless technology.
In the current situation, the rate of trenchless technology application does not exceed 20 % in Istanbul
!!!! It is necessary to increase the application rate of TT in İstanbul to the levels in developed capital cities
of the world