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…