Northern Line Extension Project

Transcription

1 1 16 TH OCTOBER 2018 Northern Line Extension Project Suresh Thiagarajan Senior Project Engineer

2 2 Northern Line Extension Battersea part of the wider Northern Line story

3 3 Contents Project Background Design constraints Tunnels, Shafts and Station Design Railway Systems Current Status & Progress Questions

4 4 Background

5 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 6 Battersea Power Station Opened 1933 Dormant from 1980s Poor transport links Many development proposals

7 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 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 9 Project Overview

10 10 Design Constraints

11 11 Local Geology Made ground Alluvium River Terrace Deposit London Clay Formation Lambeth Group River terrace deposit London Clay Lambeth Group

12 12 Challenges Tunnels Thames Water assets Power assets Victoria line Network Rail assets Existing Northern line including Oval station Existing properties Interfacing developments Encirclement at Kennington loop Battersea Dogs and Cats Home National Grid site Kennington Station New Cross passages within existing platforms Deep excavations Station boxes Noise & Vibration Schools Listed properties Local residents

13 13 Constraints Thames Water Ring Main Sewers Victoria Line EDF Cable Tunnel Kennington Loop Northern Line

14 14 Alignment

15 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 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 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 18 Tunnel Design

19 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 20 Tunnel Section Bolted RC Segmental Lining 5.2 Diameter I/D

21 21 EPBM Tunnelling 2 x TBMs (Amy & Helen) Reduces risks with ground conditions Reduced settlement - Predicted 0.5% vol. loss

22 22 Muck Removal

23 23 Muck Removal

24 24 Step Plate Junctions Interfaces with operational railway Interdependencies with various systems and disciplines Installation of new CMS Re-routing and relocation of services providing continuity. Removal of existing cast iron tunnel segments and support structure over weekend possessions Installation of new track and power assets Commissioning of new railway during a 10 day blockade

25 25 Step Plate Junctions

26 26 Step Plate Junctions

27 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 28 Kennington Ventilation Shaft Designs

29 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 30 Stations Design

31 31 Nine Elms Station

32 32 Nine Elms Station West End Entrance

33 33 Ticket Hall Level

34 34 Platform Concourse

35 35 Nine Elms Station Longitudinal Section

36 36 Battersea Power Station

37 37 Street Level Entrance

38 38 Ticket Hall Level

39 39 Platform Level

40 40 Battersea Power Station -Longitudinal Section

41 41 Railway Systems

42 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 43 Plain Line Track Methodology LVT Blocks and rail delivered into tunnel Rail Installed onto Blocks and set on alignment jigs

44 44 Plain Line Track Methodology Stage 2 Concrete Pour Final alignment adjustment and clean

45 45 Plain Line Track Methodology Track Jigs removed and made good Thermit welding

46 46 Delivery of 91m Length Rail 7/10/18

47 47 Delivery of 91m Length Rail 7/10/18

48 48 Current Status

49 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 50 Current Status - Photographs Battersea Power Station

51 51 Current Status - Photographs Battersea Power Station

52 52 Current Status - Photographs Nine Elms Station

53 53 Current Status - Photographs Nine Elms Station

54 54 Current Status - Photographs Kennington Shafts

55 55 Questions