TRENCHLESS TECHNOLOGY AN OVERVIEW

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March 2018. . Naresh Koirala, P.Eng. . NoDigSolutions. ID: 726910 Download Presentation

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TRENCHLESS TECHNOLOGY AN OVERVIEW




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Presentations text content in TRENCHLESS TECHNOLOGY AN OVERVIEW

Slide1

TRENCHLESS TECHNOLOGY

AN OVERVIEW

March 2018

Naresh Koirala, P.Eng.

NoDigSolutions

Slide2

Presentation Outline

Open Cut Method

Trenchless

method

Type of Trenchless

methods

New

construction

by Trenchless

5.

Case histories

Slide3

Open Cut

Surround bedding

Installed Pipe

Zone affected when

pipe is installed by

Trenchless method

Native Soil

Native soil

(Open cut to

Install pipe)

Import backfill

material

Road base

Asphalt

Open cut area

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Open Cut

Vancouver

Kathmandu

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Traffic

Idling traffic. Waiting for a lane to open

Forcing traffic to merge into fewer lanes

Causing traffic to be diverted to a different route

As we slow (or speed up) traffic from 40mph to 50mph we increase fuel consumption by 33%Victoria Transport Policy Institute, 2003average car cost /mile: 23 cents; bus: 35 cents

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Fuel Consumption vs. Speed

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Open Cut

Traffic Disruption

Social Cost

Environmental cost

Green House GasNot always cost effective Not a feasible option

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Trenchless Technology

New Method

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Definition

"

A family of Construction techniques for installing or rehabilitating underground infrastructure with minimal disruption to surface traffic, businesses, and residents

NASTT, 2015

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ILLUSTRATION OF TRENCHLESS AND OPEN CUT METHODS

Surround bedding

Installed Pipe

Trenchless Method

Conventional Open Cut Method

Zone affected when

pipe is installed by

Trenchless method

Native undisturbed

soil

Native soil

(Open cut to

Install pipe)

Import backfill

material

Road base

Asphalt

Open cut area

Slide14

Trenchless

Environmentally less disruptive

Cost effective under many situations, particularly if environmental, social cost is accounted for;

No other suitable method

4. This is what public wants

Slide15

Trenchless Methods

Pipe Renewal

Cured-in-Place Pipe

Thermoformed Pipe

SlipliningIn-line Replacement-Pipe Bursting-Pipe ReplacementPipe Removal(ref: ASTM F-1216- “Standard Practice for Renewal of Existing Pipelines and Conduits by the Inversion and Curing of Resign Impregnated Tube)New InstallationPipe JackingMicrotunnellingPipe RammingHorizontal Directional DrillingTunnelling Guided Auger Boring /Pilot Tube Tunnelling

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New Installations

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Planning and Design

Identify need

Service Requirement (water/sewer/telephone cable/electric power line)

Alignment

Hydraulic DesignPipe SizeGround InvestigationSelection of Suitable MethodSelection of Pipe TypeDesign Standard (design life/seismic requirements)

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Ground Investigation

Land Development

H

istory(municipal achieves/aerial photograph/surficial geological map/site inspection) Site InvestigationLaboratory TestingDevelop Geological Profile

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PIPE JACKING

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Pipe Jacking

"A technique of installing pipes

by driving a line of them through

ground with hydraulic rams from

a prepared jacking pit "

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MICROTUNNELLING

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Microtunnelling

"A remotely controlled, laser guided, pipe jacking

system in which personnel entry is not required"

Slide27

A general layout of Microtunnelling set up

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PIPE RAMMING

Slide29

A method of installing pipes by ramming it using an air Hammer

Slide30

Howe Sound, BC

Slide31

Alignment of the Outfall

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Site Constraints

Open cut trenching not allowed

Direct effluent discharge into Howe Sound not permitted

Permitting schedule for discharge within intertidal zone does not match construction schedule

Likely contaminated sideslopes / seabed

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Driving Shoe (36

” Diameter Pipe)

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Pipe Ramming (36

Diameter Pipe)

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Completion of Telescopic Pipe Ramming

.

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HORIZONTAL DIRECTIONAL

DRILLING

Slide38

Method for the installation of pipes, conduits and

cables using a surface-launched drilling rig.

Slide39

Technique

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Harrison River Crossing

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Vancouver City Central Transmission Project

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Project

Install a bundle of 5- 10 in. and 8 - 4 in Diameter conduits under False Creek to house electrical cables

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Fraser River Crossing , Terasen Gas

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Port Mann Terasson Crossing

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Up North

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Questions?


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