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TRENCHLESS TECHNOLOGY

TRENCHLESS TECHNOLOGY. GUIDED BY PRESENTED BY Mrs.ANJU BALA SURYAVEER SANGWAN H.O.D MANOJ KUMAR

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TRENCHLESS TECHNOLOGY

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  1. TRENCHLESS TECHNOLOGY GUIDED BY PRESENTED BY Mrs.ANJU BALA SURYAVEER SANGWAN H.O.D MANOJ KUMAR Department of Civil Engineering AZIZ AHMED ROHIT YADAV Semester 6,Civil

  2. CONTENTS • INTRODUCTION • TRENCHLESS CONSTRUCTION METHODS • TRENCHLESS RENEWAL METHODS • TRENCHLESS TECHNOLOGY IN INDIA • ADVANTAGES OF TT OVER TRADITIONAL OPEN CUT TRENCHES • CONCLUSION

  3. Type of subsurface construction work that requires few trenches or no continuous trenches

  4. INTRODUCTION • TT techniques include methods of pipeline & utility installations with minimum amount of surface excavation. • TT techniques are mainly divided into two main areas: TRENCHLESS CONSTRUCTION METHODS(TCM) and TRENCHLESS RENEWAL METHODS(TRM). • TCM includes all methods for new utility & pipeline installations.

  5. Continuation. . . . • TRM includes all methods of renewing, or renovating an existing old or host pipeline. • Trenchless construction and renewal project is site specific & its successful completion is dependent on factors such as accuracy, maximum installation length, diameter range, & type of application.

  6. TRENCHLESSCONS TRUCTION METHODS • Divided into two major categories: - HORIZONTAL EARTH BORING - PIPE JACKING / UTILITY TUNNELING

  7. HORIZONTAL EARTH BORING • It includes - Auger Boring - Moling - Pipe Ramming - Water Jetting - Microtunneling

  8. AUGER BORING • Used for installation of steel pipes and casings, especially under railways & road embankments. • Very economical. • It reduces damage to pavements and disruption to traffic, hence reduces social costs associated with pipeline installations.

  9. Fig.1: AUGER BORING MACHINE

  10. MOLING • Used for laying water pipes. • During moling process, a pneumatically driven machine known as a mole forces its way through the soil along the desired path of the pipe. • Mole is a steel cylinder about 60cm long and 6cm in diameter, works as a pneumatic cylinder with pulsed compressed air causing the head of the mole to repeatedly hammer against the soil in front of the mole.

  11. Fig.2: MOLE

  12. PIPE RAMMING / PIPE JACKING • Used for installation of steel pipes and casings over distances usually upto 30m long and upto 1.5m in dia. • It is also used for shallow installations under railway lines and roads. • It can be applied for horizontal as well as vertical installations. • Method is pneumatic.

  13. PIPE JACKING Jacking Procedure:

  14. Fig.4: STEPS IN PIPE JACKING

  15. WATER JETTING • Method is simple. • It uses high speed jet of water to liquefy and remove soil. • Special nozzle is attached at the end of a solid rod & extended into the bore hole. • Disadvantages:- - poor control of overcut. - disposal of large quantities of water. - possibility of ground settlement.

  16. MICROTUNNELING • Used to construct small tunnels for laying gravity pipe lines. • Micro tunnel boring machines are operated remotely. • Operator controls the machine from a control room on the surface of ground. • Most machines also have video cameras set up to give more information.

  17. Micro tunnel boring machines

  18. TRENCHLESS RENEWAL METHODS • TRM can be categorized into the following types: - Slip Lining - Grout

  19. SLIP LINING • A flexible pipe of slightly smaller dia is slid through an existing pipe. • Used to repair leaks or restore structural stability to an existing pipeline. • Completed by installing a small carrier pipe into a large host pipe grouting the annular space between the two pipes. • Materials used are high density polyethylene, fiber reinforced plastic, polyvinyl chloride.

  20. GROUT • Grout is actually a variety of materials used to fill voids, stabilize soil, hold bricks in place, coat cement, & prevent infiltration. • A typical grouting application in new construction is to seal the joints between segmented concrete pipe.

  21. TRENCHLESS TECHNOLOGY IN INDIA • Need for adoption of trenchless technology in India. • Trenchless market.

  22. DISADVANTAGES OF TRADITIONAL OPEN TRENCH METHOD • It involves excavation, pipe removal, pipe replacement, backfilling, and site restoration. • Pumping may be required in areas with a high water table. • Using open trench methods to install or repair underground utilities will invariably cause disruption to normal activities. • Traffic may be blocked, surface operations may be interrupted, & an open trench itself presents a danger.

  23. BENEFITS OF TRENCHLESS TECHNOLOGY • Excavation is not necessary between access points. • Require less space underground, minimizing chances of interfering with existing utilities or abandoned pipes. • Are generally quiet and no disruptive. • Require less exposed working area & therefore are safer for both workers & the community.

  24. CONCLUSION • Most recent developments in TT is the use of robotics. • Robots are able to enter hazardous environments. • TT robots are able to provide users with digital data.

  25. THANK YOU

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