This document discusses trenchless technology, which involves installing underground pipes and cables without disrupting the surface. It notes the disadvantages of conventional trenching that led to trenchless methods. Various trenchless techniques are described, including microtunneling, horizontal directional drilling, pipe bursting, pipe eating, and relining. The advantages of trenchless methods are that they minimize surface damage, accidents, environmental impacts, and disruption to daily life above ground. Trenchless technology allows for installation, repair, and rehabilitation of underground infrastructure with minimal disturbance.

1. J.PRATHYUSHA G.TEJASRI
DEPARTMENT OF CIVIL ENGINEERING

2. TRENCHLESS
TECHNOLOGY

3. INTRODUCTION
 Trenchless technology is basically making a tunnel
below the surface and installing service lines like water
or gas pipes, electric or telecommunication cables etc.
with out any disruption to the public.
 It also makes it possible to install the utilities under
rivers canals and other obstacles with no disruption of
flow and with minimum or no damage to the
environment.

4. NEED FOR TRENCH LESS TECHNOLOGY
 The disadvantages and difficulties encountered in
conventional trenching methods have resulted in
thinking of the need for trenchless technology.
 The advantages of the no-dig technology are also
responsible for the need of this technology to be adopted
in mainly urban areas

5. TRENCHLESS
TECHNOLOGY
NEW
INSTALLATION
MICRO
TUNNELING
HORIZONTAL
DIRECTIONAL
DRILLING
SHORT DRIVE
SYSTEM
GUIDED
DRILLING
REHABILITATIO
N AND
RENOVATION
PIPE
BURSTING
PIPE
EATING
RELINING
LOCALISED
REPAIR

6. MICRO TUNNELLING
 Used to describe remotely controlled mechanical
tunneling systems.
 Used extensively for sewage work where surface
disruption has to be minimized

7. HORIZONTAL DIRECTIONAL DRILLING
 Used for installing pressure pipes under major obstacles
such as motor way intersections , large rivers and airport
runways.
 A small rotating and steerable drill bit
is launched from the surface
at an angle10-15 .

8. SHORT
DRIVE
SYSTEM
AUGER
BORING
IMPACT
MOLING
ROD
PUSHING

9. GUDIED DRILLING
 Guide drilling employs an excavation or soil
displacement with compact lightweight rig for rapid
mobilization.
 The drilling head is launched from the surface at an
inclined angle.

10. PIPE BURSTING
 In this method an existing pipeline can be replaced with
a pipeline of the same or larger dimension without
opening up the ground.
 The main advantage of this system is that a small power
source can be used to drive the mole with minimum time.

11. PIPE EATING
 Pipe eating is an online micro tunneled replacement
technique.
 The existing defective pipeline is crushed and removed
through the new pipeline.

12. RELINING THE EXISTING PIPES
 A flexible liner is places into the defective pipe and with
the use of water under pressure finds its own way and
can pass bends of 90o .
 When the liner is in place, it is heat cured to
create a rigid, tough, and smooth inner surface.
LOCALISED REPAIR
 Pipe slip lining is another method used that involves
inserting new smaller pipes in to older, damaged sewers
thereby replacing the old pipe.
 Modified pipe slip lining is the modification under the
pipe slip lining which is more advantageous .

13. ADVANTAGES OF NO-DIG
TECHNOLOGY
 It reduces damages of valuable surface.
 It saves resources and it is accident free.
 It reduces the impact on the environment.
 It reduces the danger of improperly compacted
excavations.
 It saves underground space.
 For replacement, repair and rehabilitation of old water
and sewer lines in cities, it is very helpful to use trench
less technology without disturbing the normal life on the
surface.

14. CONCLUSION
 By adopting this technology we can successfully
implement pipes under the surface with out making any
disruptions to the environment and public.
This enables us to retain our available resources.
There by keeping the earth unexcavated

15. THANK YOU

16. QUERIES