THE FOLLO LINE PROJECT IN OSLO

13th Australian Tunnelling Conference13 – 14 October, Sydney

Michael Huber Ghella Pty Ltd

Index

1. Project Overview

2. Geology

3. TBM Design

6. Construction Sequence

4. Site Layout

8. Permanent Way

9. Railway Systems

5. TBM and Site Logistics

7. Cross Passages

The Follo Line Project

1. PROJECT OVERVIEW

High speed railway line

22 km with 20 km of tunnel

Split in six major EPC contracts

Commissioned by the Norwegian National Railway Administration (Jernbaneverket)

Follo Line EPC Civil Works Contracts

1. PROJECT OVERVIEW

#1 #2#3 #4

Follo Line EPC TBM Contract #3 Scope

1. PROJECT OVERVIEW

D&B access 300.000 m3 10 months

D&B escape tunnel 74.000 m3 15 months

TBM excavation 4 drives 36.500 m 24 months

Cross passages 40 24 months

Track and systems 42.000 m 24 months

Commissioning 6 months

Total Duration 78 months

Follo Line Construction Contract EPC TBM

Acciona Infraestructuras S.A. and Ghella S.p.A. Joint Venture (AGJV)

Awarded in March 2015

Completion October 2021

Contract value: 1 billion Euro

1. PROJECT OVERVIEW

012. GEOLOGY

Follo Line Geological Profile

Largely tonalitic to granitic gneiss

Average compressive strength: 142 MPa - peak above 300 MPa

Mixed Face conditions: 15% of alignment amphibolite 250 MPa & gneiss UCS 100 MPa

Average quartz content: 28% - peak above 50%

Maximum overburden: 150m

Groundwater level is generally 2 - 3 m below terrain

SkiOslo

2. GEOLOGY

Ground Water

Impact on ground water

levels is main concern

Sensitivity classification

4 classes

2. GEOLOGY

Control of Pore Pressure and Ground Water Levels

Systematic probe drilling

Pre- excavation grouting

Water infiltration wells

013. TBM DESIGN

TBM Cutterhead Design

Adapted to high rock strength

Jernbaneverket input based on

Norwegian experience

71 Cutter rings 19” on 70 tracks

Heavy structure, stiff support

Main bearing size increased to ø 6.6 m

013. TBM DESIGN

Provisions for Systematic Grouting

Specific drill rig

setup

Independent

grouting system

driven to TBM

013. TBM DESIGN

Overview Double Shield TBMs

Four machines

Diameter 9.96 m

CHD Power 4550 kW

Length 150 m

Weight 2300 t

Conveyor belt

MSV supply

Twin quick unloader

Supplier Herrenknecht

3. TBM DESIGN

Outer Diameter 9,55 m

Inner Diameter 8,75 m

Thickness 400 mm

Segment Length 1,8 m

Segments + Key 6 + 1

Total Concrete 500.000m3

Backfilling two component grout

Segment Design

4. SITE LAYOUT

Åsland Site Overview

Main site in middle of project

Directly on E6 motorway

Adit tunnels completed before

handover

Accommodation on site

Spoil deposit area on site

4. SITE LAYOUT

Åsland Site October in 2015

4. SITE LAYOUT

Site Layout Åsland Site

1) Adit portals

2) Conveyor

3) Spoil handling

4) Aggregate handling

5) Batch plants

6) Segment factory

7) Segment storage

8) Office & accommodation

1

4

56

7

7

8

2

3

4. SITE LAYOUT

Adit Tunnel Portals and Lower Area in October 2015

4. SITE LAYOUT

Åsland Site Lower Area

1) Adit tunnel portals

2) Water treatment plant

3) Grout plants

4) Storage areas

5) Stores

6) Workshops

7) Conveyors

1

6

6

5

4

3

2

7

1

4. SITE LAYOUT

Underground Structures Layout and Ventilation Concept

Adit South is air intake

and vehicle route in

Adit North is air exhaust,

conveyor and vehicle route out

015. TBM AND LOGISTICS

Segment Supply with MSVs

Suitable for two complete rings with invert segments

01

MSV Design

Load capacity 125 t

Length 45 m

Turning radius 15 m

Engine 405 kW, Euro IV

Operational grade +/- 10 %

Retarder system

Winter provisions

5. TBM AND SITE LOGISTICS

015. TBM AND SITE LOGISTICS

Systems in TBM Tunnels

Conveyor belt 850 t/hr

Ventilation duct 2.8 m

Lines for grout A + B component

Lines for water supply, dewatering, cooling

Invert segment for MSV traffic

6. CONSTRUCTION SEQUENCE

Underground Drill and Blast Structures

Assembly Caverns

Height up to 20 m

Width 26 m

Length 55 m

Cross section 460 m2

Excavation volume 27.700 m3

Currently 30 % excavated

6. CONSTRUCTION SEQUENCE

Access Tunnels

Transport tunnels

Auxiliary tunnels added by AGJV

to improve access and program

Average of 50 % excavated

6. CONSTRUCTION SEQUENCE

TBM Assembly Sequence

Auxiliary tunnels allow concurrent TBM shield and backup assembly

6. CONSTRUCTION SEQUENCE

Underground TBM Assembly with Lifting Gantries

Reduced assembly cavern size compared to

crane solutions

Capacity for TBM system 1100 t

Capacity of system for backups 400 t

6. CONSTRUCTION SEQUENCE

TBM Assembly with Lifting Gantries

6. CONSTRUCTION SEQUENCE

TBM Disassembly with Lifting Gantries

Disassembly of TBM 1 / TBM 2 in cavern

The same lifting gantries will be used

Can also be used for TBM 3 and TBM 4

017. CROSS-PASSAGES

Design and Construction

Spacing 480 m

Major equipment in every second one

Cross sections from 28 to 42 m2

Construction in parallel with TBM operation

Hydraulic hammering and D&B

018. PERMANENT WAY

Construction Sequence

Execution of Base Slabs and Walkways

Rheda 2000 Sleepers with Provisional Track

Final Levelling and Alignment Adjustment

Slab Concreting

Installation of the Final Rail with Pandrol clips

Electric Welding

Rails supplied in 120 m lengths from Ski side

Sleepers and Rail are provided by Jernbaneverket

019. RAILWAY SYSTEMS

Scope of Works

TRACTION POWER SUPPLY (TPS)

OVERHEAD CONTACT LINE (OCL)

INFRASTRUCTURE POWER SUPPLY ( IPS )

LOW VOLTAGE SYSTEMS ( LVS)

VENTILATION SYSTEM

FIRE FIGHTING SYSTEM

DOORS AND AIRLOCKS

01THE FOLLO LINE PROJECT

Scheduled for Completion End 2021

THANK YOU FOR YOUR ATTENTION