PROF. DR. FEVZİ YILMAZFatih Sultan Mehmet Vakıf University,Faculty of Engineering, İstanbul

ICSG ISTANBUL 2015, 29-30 APRIL

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

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.

Social Cost

«no dig no risk», «minimum dig minimum risk»«TT or no-dig=minimal impact to the ground»

An example of open cut and no-dig project area

Trench and / or Trenchless

Underground pipe networks / features > 5 times total length of streets and roads Not visualized People neglect their importance

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

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

DETECTION METHODS AND ASSESMENTS(Includes technologies for inspection, leak location, and leak detection)

CCTV (Closed-Circuit Television)

Leak detection

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

TO GO FROM TRENCHING TO TRENCHLESS

From Open Trench to Directional Drilling

HDD (Horizontal Directional Drilling)

1) drilling a guided pilot hole 2) forming a flowable slurry 3) pulling the new pipe (PE,PVC,DI.Steel)

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.

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

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

CURED-IN-PLACE PIPE (CIPP)

The rehabilitated sewer in front of Hagia Sophia by CIPP methods

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)

HORIZONTAL DIRECTIONAL DRILLING (HDD)

HDD application on Barbaros Street – Beşiktaş

HDD application on Seyrantepe near the TEM

PIPE BURSTING

Pipe bursting application site in Beşiktaş

Stages: 1.old host pipe fragmenting 2.new pipe pulling

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

PROF. DR. FEVZİ YILMAZFatih Sultan Mehmet Vakıf University,

Faculty of Engineeringf.yilmaz@fsm.edu.tr