TRENCHLESS TECHNOLOGY

Prepared By:PATEL HEMISHKUMAR ANILBHAIENROLLMENT NO: 130080714008FIRST SEMESTER

BIRLA VISHVAKARMA

MAHAVIDHYALAYA

GUJARAT TECHNOLOGICAL

UNIVERSITY

M.E. [ CONSTRUCTION ENGINEERING & MANAGEMENT ]CONSTRUCTION TECHNIQUES

(711402)

Guide By:PROF. JAYESHKUMAR R. PITRODA

ASSISTANT PROFESSOR & RESEARCH SCHOLAR

CIVIL ENGINEERING DEPARTMENTB.V.M ENGINEERING COLLEGE

V.V.NAGAR

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CONTENTS

Introduction History WHY Trenchless ? Trenchless methods

New installation Rehabilitation and Renovation

Techniques of Trenchless Technology Conclusion Reference Acknowledgement

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Introduction

A family of methods, materials, and equipment capable of being used for the installation of new or replacement or rehabilitation of existing underground infrastructure with minimal disruption to surface traffic, business, and other activities.

4

History

Trenchless technology has been around for many decades

Auger or Jack and Bore in use for 40-50 years Impact moles were populars for street crossings and

to go under rock gardens Horizontal Directional Drilling (HDD) started to gain

popularity in late 80`s Address at 1991 ‘ NO DIG’

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Why TRENCHLESS ?

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Why TRENCHLESS ?

Minimal disturbance to traffic

Year around construction

Improved safety

Reduced landscape damage

Minimal disturbance to local business

Improved construction productivity

Can access otherwise inaccessible areas

7 TRENCHLESS METHODS

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New installation

Methods for the installation of a new pipeline or duct, including dealing with service connections are :

Augur boring

Impact moling

Micro tunneling

Horizontal Directional Drilling

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AUGUR BORING

To excavate the soil, which is transported by augur flights operating in a casing the drive pit.

Range 100 to 1000 mm diameter

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IMPACT MOLING

Impact moling is a technique in which a percussive mole (soil displacement hammer) is launched from an excavation to displace the soil and form a bore.

This method is restricted to relatively small diameter lines in compressible soil conditions.

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MICROTUNNELING

The micro tunneling boring machine is remote controlled, a laser guided system is employed, a jacking system is used to thrust, and continuous pressure is provided to the face of the excavation to balance groundwater and earth pressures.

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HORIZONTAL DIRECTIONAL DRILLING (HDD)

Used for installing pressure pipes under major obstacles such as airport runways, rivers, railway tracks and roads.

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Rehabilitation and Renovation

Methods including are:

i. Pipe bursting

ii. Pipe eating

iii. Relining the existing pipes

iv. Localized repair

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PIPE BURSTING

In this method an existing pipe can be replaced with a pipeline of the same or larger dimension without opening up the ground.

It used where the load on the system is more than the existing pipe can handle and replacement is required.

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PIPE EATING

Pipe eating is an online micro tunneled replacement technique.

The existing defective pipeline is crushed and removed through the new pipeline

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RELINING THE EXISTING PIPES

In this method man hole required at the both ends of pipe.

Cured-in-place lining Spray

liningSlip liningClose-fit lining

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LOCALIZED REPAIR

i. Coatings

ii. Cement mortar

iii. Reinforced gunite

iv. Resin

v. Grout

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Techniques of Trenchless Technology

i. Augur boringii. Molingiii. Rammingiv. Directional drilling

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AUGUR BORING

Auger boring is a technique for forming a horizontal bore hole through the ground, from a drive shaft to a reception shaft, by means of a rotating cutting head. The cutting head is attached to the leading end of an auger string. Spoil is transported back to the drive shaft by the rotation of helical-wound auger flights within the steel casing pipe. Vertical control, using a water level, is typical.

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Advantages

AUGUR BORING

The major advantage is that the casing is installed at the same time as the borehole excavation takes place.

This method can be used wide variety of soil types.

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Disadvantages

AUGUR BORING

This method requires different size cutting heads and augur sizes or each casing diameter, which increases the investment in equipment.

The investment in bore, pit construction, and the initial setup is also required.

In case of soils containing large boulders, this method cannot be used advantageously.

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MOLING

Instead pits are excavated at intervals for the mole to be placed. The mole is then entered into the earth on the horizontal face at the bottom of the pit. Destination pits of similar proportions are also dug.

The mole displaces the soil creating a bore for the new services to then be pulled through.

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Advantages

MOLING

It is a rapid, economic, and effective method of installing small diameter lines.

Any type of utility line can be installed using this method.

The stability of the soil around the borehole is increased due to compaction.

The investment in equipment is minimum.

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Disadvantages

MOLING

Compaction method are limited in their length by reliability because basic systems are unintelligent, unguided tools that tend to bury themselves, surface in the middle road or damage exiting utility lines.

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RAMMING

Ramming creates very little displacement in the surrounding ground.

The pipe is rammed through the soil by using a device attached to the end of wide to drive the pipe through the soil.

This method is economical for small dia pipelines.

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DIRECTIONAL DRILLING (DD)

Directional Drilling makes the impossible possible. Generally, it is preferred for long line drilling.

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Advantages

D D

The major advantage is the speed of installation combined with the minimum environmental and social impact.

Long and complicated crossings can be accomplished with a great degree of accuracy.

Sufficient depth can be accomplished to avoid other utilities.

Limitation of access and reception pits is another advantage.

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Disadvantages

D D

Special equipment and very high degree of operation skill is required.

As the cost of equipment and the operation are high, bore length should be sufficient in order for it to be economical.

Mainly steel pipe is being installed by this method.

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CONCLUSION

Cost effective Low labor requirements Little site restoration required

Environmental friendly Reduce environment Construction hazards Reduce noise and air quality impacts

Reduce traffic congestion Trenchless technology is the new way

forward.

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Reference

www.groundforce.uk.com/Trenchless+Technology

www.istt.com/guidelines/pipe-jacking-microtunneling

www.trenchlesssolutions.co.uk/services/impact-moling

www.molingsolutions.co.uk/ www.tedberrycompany.com www.tritonpipelining.com

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ACKNOWLEGEMENT

DR. F. S. Umrigar, Principal, B.V.M. Engineering college, Prof. J. J. Bhavsar, Associate Prof., PG co-ordinator, cvil engineering department, B.V.M. Engineering college Vallabh Vidhyanagar, Gujrat, India for their motivation and infrastructural support to carry out the research work.

Prof. Jayeshkumar R. Pitroda assitant prof. And research scholar civil engineering department, B.V.M. Engineering college Vallabh Vidhyanagar.

32THANK

YOU