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23-09-2008, 12:29 AM
Trenchless technology is a relatively new term that describes the installation of conduits beneath roadways without open-cutting. The term has been used on a global basis since the mid-1980s. However, some of the methods referred to as trenchless methods are not new. For example, auger boring and slurry boring have been used since the 1940s, and pipe jacking has been used since the early 1900s. These methods are referred to as road boring techniques or horizontal earth boring techniques. Nevertheless, many new trenchless techniques have been introduced and many advancements have taken place with the more traditional techniques. Although most of these methods require excavation for shafts, shaft locations usually can be selected to avoid or minimize traffic disruption.
It is anticipated that the use of trenchless technology will continue to increase because of its inherent advantages of minimizing disruption to society and reducing environmental impact. Another driving force behind this increase is the benefit of avoiding or minimizing the handling, volume, treatment and/or disposal of contaminated soil. In many situations, these techniques have become cost-effective alternatives to traditional open-cutting methods. .
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07-04-2011, 11:03 AM
i need the report on trenchless technology for my seminar and presentation
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02-11-2012, 11:56 AM
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Trenchless Technology[.pptx (Size: 5.27 MB / Downloads: 39)
Trench less technology is basically making a tunnel below the surface and staling service lines like water or gas pipes , electric or telecommunication cables etc.
Busy areas requires diversions before start of digging of work and entailing avoidable expenditure.
Cutting dip trenches in congested areas , cracks appear on the adjacent buildings.
1. Micro tunneling
2. Horizontal directional drilling
3. Short drive system
4. Guided drilling
Remotely controlled mechanical tunneling systems where the soil is removed from the cutting head with in the new pipe line which is advanced by pipe jacking.
Works in all types of ground condition.
With appropriate cutting tools and crushing devices for range of gravels, sands, and clays.
Soil is removed from the face by an auger, running through the newly installed pipeline.
Alternatively, water is used to convert the soil into slurry.
Horizontal directional drilling
Horizontal directional drilling uses a drilling rig on the surface to install a drill pipe in a shallow underground arc.
The drilling rig bores a pilot hole that's filled with fluid and then uses a swiveling reamer to enlarge the hole to the final sewer pipe size.
Sewer pipe is then pulled through the hole.
Directional drilling often needs a large staging area so the pipe can be lined up before it's pulled into the hole.
Placement of small diameter pipes, ducts and cables in which percussion or hammering action of a pneumatic piercing tool is used to create the bore by displacing the soil rather than removing it.
The simplest, least expensive and the most widely used trenchless method.
Used for installation of service connections to gas, water & sewer mains usually under sidewalks, drive ways and other short crossings.
Simple in operation, minimum excavation for the installed product and minimum public disruption .
It reduces damages of valuable surface and the danger of improperly compacted excavations.
It saves resources, accident free and avoids traffic jam.
It makes the use of the line (track) of the old pipe possible and saves underground space (pipe busting).
It reduces the impact on the environment.
It is possible to lay service lines across railway track, narrow lanes etc. When open trenching is impossible.
If there are both soil and hard, material different type of machine will be required which may inconvenient and uneconomical.
Ground obstacle like existing services, old pipe lines etc. may create a problem.
Precise control of gradient and alignment are sometimes difficult to achieve..
Equipment for trenchless technology are presently not manufactured in India and operator should have extensive experience in this work.
Planners need to understand the opportunities that the alternatives TT have to Offer.
Designer must design with the knowledge that a wide range of TT and techniques are already available with continuing economic advantages.
High level strategies within the utilities to utilize the available technology must be encouraged.
When the traffic authorities and utilities recognize the need for and advantage of T.T then the true potential of no-dig techniques will start to be realized.