TRENCHLESS

TECHNOLOGY

GUIDED BY PRESENTED BY

Ms. PRAJEESHA.M.P DEEPAK.C

Lecturer. Semester 7,Civil

Department of Civil Engineering. Roll No:58

CONTENTS

• INTRODUCTION

• TRENCHLESS CONSTRUCTION METHODS

• TRENCHLESS RENEWAL METHODS

• TRENCHLESS TECHNOLOGY IN INDIA

• ADVANTAGES OF TT OVER TRADITIONAL

OPEN CUT TRENCHES

• CONCLUSION

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

Continuation. . . .

• TRM includes all methods of renewing,

rehabilitating, or renovating an existing old or

host pipeline or utility system

• Trenchless construction and renewal project is

site specific & successful completion of it is

dependent on factors such as accuracy,

maximum installation length, diameter range, &

type of application

CONSTRENCHLESS TRUCTION

METHODS

• Divided into two major categories:

- HORIZONTAL EARTH BORING

- PIPE JACKING / UTILITY TUNNELING

HORIZONTAL EARTH BORING

• It includes

- Auger Boring

- Moling

- Pipe Ramming

- Water Jetting

- Microtunneling

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

Fig.1: AUGER BORING MACHINE

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

Fig.2: MOLE

PIPE RAMMING

• 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

WATER JETTING

• Method is simple

• It uses high speed jet of water to liquefy and remove soil

• Special nozzle is attached to the end of a solid rod & extended into the bore hole

• Disadvantages:-

- poor control of overcut

- disposal of large quantities of water and

muck

- possibility of ground settlement

MICROTUNNELING

• Used to construct small tunnels for laying

gravity pipe lines

• Microtunnel 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

PIPE JACKING

Jacking Procedure:

Fig.4: STEPS IN PIPE JACKING

TRENCHLESS RENEWAL METHODS

• TRM can be categorized into the following types:

- Coatings

- Sliplining

- Pipe Bursting

- Cured-in-place pipe

- Grout

COATINGS

• To repair cracks in the original pipe, or to protect it from corrosive wastewaters or mechanical abrasion

• Coating is applied to the interior of the deteriorated pipe manually

• Coatings are applied by spray, brush, trowel, or roller

• Must be applied to clean, dry surface

• Advantage is that no extra work or equipment is necessary

SLIPLINING

• 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,

fibre reinforced plastic, polyvinyl chloride

PIPE BURSTING

Fig.5: PIPE REPLACEMENT BY PIPE BURSTING

CURED-IN-PLACE PIPE

• CIPP is typically a flexible tube

constructed of non woven polyester felt

material impregnated with a resin that

hardens after installation

• Water pressure is produced with a stand

pipe

A resin saturated, coated filled tube is inverted(left) or pulled (right) into a

damaged pipe

Next, hot water or steam is used to cure the resin & form a tight-fitting,

jointless & corrosion-resistant replacement pipe Fig.7: CIPP process

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

• It seal off ground water infiltration in

nonpressure pipelines

TRENCHLESS TECHNOLOGY IN

INDIA

• Need for adoption of trenchless

technology in India

• Trenchless market

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

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 nondisruptive

• Require less exposed working area & therefore are safer for both workers & the community

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

REFERENCES

1. Mohammad Najafi, Sanjiv Gokhale, Trenchless Technology, Mc

Graw-Hill Professional Publications.

2. Steven R Kramer, William Jesse McDonald,

James C Thomson,An intoduction to trenchless technology

3. Steve Orchad “Directional Drilling And Assoctated

Technolagies” No-Dig International Journal, November 2008

4. Public Works Technical Bulletin 420-49-10, 28 February 1999.

5. Brij D.K.Gunjal, 1996, “Trenchless Technology in India”:366-

368.

6. www.Trechlessonline.Com

7. www.tttechnologies.com

THANK YOU