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 1

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

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

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. 4

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. 5

TRENCHLESS CONS TRUCTION METHODS Divided into two major categories: - HORIZONTAL EARTH BORING - PIPE JACKING / UTILITY TUNNELING 6

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

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. 8

Fig.1: AUGER BORING MACHINE 9

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. 10

Fig.2: MOLE 11

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. 12

PIPE JACKING Jacking Procedure: 13

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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

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 26