1

16TH OCTOBER 2018 Northern Line Extension Project

Suresh Thiagarajan – Senior Project Engineer 2 Northern Line Extension

Battersea 2020 - part of the wider Northern Line story 3 Contents

• Project Background • Design constraints • Tunnels, Shafts and Station Design • Railway Systems • Current Status & Progress • Questions 4

Background 5 Vauxhall, Nine Elms, Battersea VNEB

• An ‘Opportunity area’ in SW London

• 195 hectares

• 3 km of Thames river frontage

• 18,000 new homes

• 5 hectares of public open space

• 24,000 new jobs

• £1 billion of infrastructure

• Local Transport improvements

• New schools / healthcare / community space 6 Battersea Power Station

• Opened 1933 • Dormant from 1980s • Poor transport links • Many development proposals 7 TfL Transport Studies

Transport studies in 2009 / 10 considered a number of options: • Bus routes and segregation • Light Rail • London Underground extensions. Victoria Line (Vauxhall), Bakerloo Line (Elephant & Castle), District Line (Sloane Square), Northern Line (Kennington)

Conclusion • Level of development is such that a high level of public transport capacity is required – best delivered through an extension of the tube. • Extension of Northern Line Charing Cross branch reduces pressure on Vauxhall station and provide relief to the Victoria line and the existing Northern line south of Kennington 8 Key Programme Requirements

• Capability of up to 30 trains per hour

• Efficient, safe and reliable service

• Minimise environmental impacts

• Minimal impact on the existing railway

• Fully integrated with the urban design

• Fully integrated with other transport operators 9 Project Overview 10

Design Constraints 11 Local Geology

• Made ground River terrace deposit • Alluvium • River Terrace Deposit • London Clay Formation • Lambeth Group London Clay

Lambeth Group 12 Challenges

Tunnels Kennington Station – Thames Water assets – New Cross passages within – Power assets existing platforms – Victoria line Deep excavations – Network Rail assets – Station boxes – Existing Northern line including Oval station Noise & Vibration – Existing properties – Schools – Listed properties – Interfacing developments – Local residents – Encirclement at Kennington loop – Battersea Dogs and Cats Home – National Grid site 13 Constraints

Thames Water Ring Main Sewers

Victoria Line

EDF Cable Tunnel

Kennington Loop

Northern Line 14 Alignment 15 Tunnel Alignment

Constrained by TWAO Limits of Deviation Minimise journey time Minimise ground borne noise and vibration Safety Quality of ride

London Underground standards • Curves - min radius 300m –Concession from 400m. • Gradients - max 2.00%, min 0.250%, level stations • Cant - max 125mm, • Speed - Vmax. 90km/h . 16 P&C and Junctions

• Kennington Step Plate Junctions Northbound Cv9.25 – NLE 245m rad / NL (Loop) straight Southbound Cv9.25 equal split – NLE 490m rad / NL (Loop) 490m rad 17 P&C and Junctions

• Battersea scissors crossover, - 4 Standard Straight Cv9.25, with large radius curves between turnouts, scissors crossover is slightly tapered, being wider at platform end. Crossover is level throughout. 18

Tunnel Design 19 Overview of Tunnelling

• Main TBM drives approx. 5.2km total • TBM could not junction with the loop • Shafts located 70m and 200m from junctions - SCL • Difficult to mechanise excavation around existing tunnel - SGI 20 Tunnel Section

• Bolted RC Segmental Lining • 5.2 Diameter I/D 21 EPBM Tunnelling

• 2 x TBMs (Amy & Helen)

• Reduces risks with ground conditions

• Reduced settlement - Predicted 0.5% vol. loss 22 Muck Removal 23 Muck Removal 24 Step Plate Junctions Interfaces with Installation of new operational railway CMS Interdependencies with Re-routing and various systems and relocation of disciplines services providing continuity.

Removal of Installation of new existing cast iron track and power tunnel segments assets and support Commissioning of structure over new railway weekend during a 10 day possessions blockade 25 Step Plate Junctions 26 Step Plate Junctions 27 Tunnel and Station Cross Passages Three cross passages between the bored running tunnels were constructed to facilitate operational evacuation as agreed with LFB.

Constructed in the London Clay and Lambeth Group using timber headings and SGI Segments

Four new cross passages in Kennington Station between the existing platforms to facilitate congestion relief and station evacuation. Constructed in the London Clay and using timber headings and SGI Segments 28

Kennington Ventilation Shaft Designs 29 Kennington Shaft Structures • Secant Piled Wall Construction • SCL Shaft for tunnel interface • Complex integration with multidiscipline services

Kennington Green

Kennington Park Two Permanent ventilations shafts at Kennington Green and Kennington Park to allow air in and out of the underground tunnels to help cool the Tube. It is also required to enable emergency intervention and evacuation from the tunnels. 30

Stations Design 31 Nine Elms Station 32 Nine Elms Station – West End Entrance 33 Ticket Hall Level 34 Platform Concourse 35 Nine Elms Station Longitudinal Section 36 Battersea Power Station 37 Street Level Entrance 38 Ticket Hall Level 39 Platform Level 40 Battersea Power Station -Longitudinal Section 41

Railway Systems 42 Track Form

• The new track being installed is flat bottom rail • 4800m of Sonneville LVT Block track form for the Tunnels – First substantial use on Tube network • Delkor “RF167” base plates for 4NO. Platform safety pit areas in Battersea and Nine Elms 43 Plain Line Track Methodology

LVT Blocks and rail delivered into Rail Installed onto Blocks and set on tunnel alignment jigs 44 Plain Line Track Methodology

Stage 2 Concrete Pour Final alignment adjustment and clean 45 Plain Line Track Methodology

Track Jigs removed and made good Thermit welding 46 Delivery of 91m Length Rail – 7/10/18 47 Delivery of 91m Length Rail – 7/10/18 48

Current Status 49 Status Overview

• All tunnelling work complete as of mid September 2018

• Track installation has commenced. Works between the Step plate junction and shafts, plain line between Battersea Launch tunnels and Nine Elms box and platform areas to Battersea Power Station are all complete

• Excavation works to both Kennington Shafts are ongoing with construction of secondary structures.

• Nine Elms and Battersea Power stations secondary structures works are ongoing

• Design works for Signals and Systems ongoing with Thales (PFI Contract)

• Fit Out works have commenced - NLE due for completion 2020 50 Current Status - Photographs Battersea Power Station 51 Current Status - Photographs Battersea Power Station 52 Current Status - Photographs Nine Elms Station 53 Current Status - Photographs Nine Elms Station 54 Current Status - Photographs Kennington Shafts 55

Questions