J.PRATHYUSHAG.TEJASRI DEPARTMENT OF CIVIL ENGINEERING

TRENCHLESS TECHNOLOGY

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.

N EED 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

TRENCHLESS TECHNOLOGY NEW INSTALLATION MICRO TUNNELING HORIZONTAL DIRECTIONAL DRILLING SHORT DRIVE SYSTEM GUIDED DRILLING REHABILITATI ON AND RENOVATION PIPE BURSTING PIPE EATING RELINING LOCALISED REPAIR

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

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.

SHORT DRIVE SYSTEM AUGER BORING IMPACT MOLING ROD PUSHING

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.

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.

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

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 90 o. 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.

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.

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

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