TRENCHLESS TECHNOLOGY GUIDED BY PRESENTED BY Ms. PRAJEESHA.M.P DEEPAK.C Lecturer. Semester 7,Civil Department of Civil Engineering. Roll No:58
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