Introduction
Why Trenchless Technology
Advantages & Disadvantages
Site Investigation
Methods Of Trenchless Technology
Conclusion
References
What is Trenchless Technology….????
Trenchless technology refers to the idea that underground
utilities can be maintained and installed without expensive and
annoying excavations.
The International Society for
Trenchless Technology - 1986
Heavy Vehicular And Pedestrian Traffic
Numerous Existing Underground Utilities
Locations Where Surface Access May Be Restricted i.e. Vegetation.
Crossing Rivers And Waterways
No Problem For The City People
Advantages
• Less disruption to traffic
• Minimal space required
Reduced Risk Of Damage To Nearby Nature, Structures
Enhanced work and public safety
Reduces Pollution and Waste
Costly equipment
High degree of operation is required
No control over the line & grade
Geological Survey
Boring & Sampling
Depth Of GWT
Penetration Test / test pits
Examinations And Investigations Of Existing Structure
1. New installations
◦ Micro Tunneling
◦ Horizontal Directional Drilling
2. Rehabilitation & renovation
◦ Pipe Bursting
◦ Pipe Eating
• Digging technique used to construct small tunnels
• Micro tunnel boring machines (MTBM) - 0.61 to
1.5 meters Φ
• Shaft for setting MTBM & jacking frame
• Operator controls the MTBM & jacking frame
• AS length increases , friction increases
• First, over-cutting is done, secondly, a lubricant is injected
Trenchless Method Of Replacing Buried Pipelines
Five Key Pieces Of Equipment Used
◦ Expander head,
◦ Pulling rods,
◦ A pulling machine,
◦ A retaining device, and
◦ A hydraulic power jack.
Upsizing
Upsizing from 100mm to 225mm diameter of up to 900mm
Also be used to expand pipeline
The principle behind trenchless technology is to minimize the
disruption caused whenever infrastructure has to be installed in
underground.
As It takes less people and less time to complete this type of project,
the costs are significantly lower than traditional excavations.
Public Works Technical Bulletins , Published By The U.S. Army Corps Of
Engineers, Washington, DC. PWTB 420-49-10 28 February 1999 .
Trenching And Conduit Standard For Underground Distribution Cable
Networks ,Published: 3 September 2012
Maninder Singh , Techniques Of Trenchless Technology Use In India
.Civil Engineering And Construction .Review October 2009…
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