London Borough of Greenwich Greenwich and Woolwich Foot Tunnels Feasibility Study for Refurbishment 06 May 2008 Report no: LN01084/1 London Borough of Greenwich Greenwich and Woolwich Foot Tunnels Feasibility Study for Refurbishment Author: William Day Checker: Martin Morris Approver: Geoff Hilling Report no: LN01084/1 Date: 06 May. 08 This report has been prepared for London Borough of Greenwich in accordance with the terms and conditions of appointment for Greenwich and Woolwich Foot Tunnels dated . Hyder Consulting (UK) Limited (2212959) cannot accept any responsibility for any use of or reliance on the contents of this report by any third party. Hyder Consulting (UK) Limited 2212959 29 Bressenden Place, London SW1E 5DZ, UK Tel: +44 (0)870 000 3006 Fax: +44 (0)870 000 3906 www.hyderconsulting.com Contents 1 Summary....................................................................................................................1 2 Introduction ...............................................................................................................3 2.1 Description of the tunnels............................................................................................. 3 2.2 Refurbishment of Greenwich and Woolwich Tunnels................................................... 6 2.3 Function of the Feasibility Study Report....................................................................... 7 3 Conservation .............................................................................................................8 3.1 Listed Building Consent................................................................................................ 8 3.2 Philosophy and Approach to Conservation .................................................................. 8 4 Access and Way Finding........................................................................................10 4.1 Survey of tunnel use................................................................................................... 10 4.2 Signing ....................................................................................................................... 11 4.3 Disabled access ......................................................................................................... 12 4.4 Provisional Fire Strategy ............................................................................................ 13 4.5 Presentation ............................................................................................................... 18 5 Structural and Civil Engineering Elements...........................................................22 5.1 Tunnels....................................................................................................................... 22 5.2 Cable management system to tunnels....................................................................... 25 5.3 Shafts ......................................................................................................................... 26 5.4 Domes and top works buildings ................................................................................. 26 5.5 Painting and corrosion protection............................................................................... 28 5.6 Water management.................................................................................................... 28 5.7 Material and other investigations................................................................................ 28 6 Lift Engineering.......................................................................................................28 6.1 Lift cars....................................................................................................................... 28 6.2 Machine room............................................................................................................. 28 6.3 Door system and landings.......................................................................................... 28 6.4 Car top........................................................................................................................ 28 6.5 Lift shaft and pit.......................................................................................................... 28 6.6 Special features.......................................................................................................... 28 6.7 Reliability of existing lifts ............................................................................................ 28 6.8 Shortfalls against current codes of practice................................................................ 28 6.9 Modernisation performance objectives....................................................................... 28 7 Communications and Controls..............................................................................28 7.1 Introduction................................................................................................................. 28 Page i Greenwich and Woolwich Foot Tunnels Hyder Consulting (UK) Limited 2212959 C:\Documents and Settings\fchugtai\Local Settings\Temporary Internet Files\OLK1D\Appendix B Feasibility 06/05/2008 2 Report Final.doc 7.2 Current systems ......................................................................................................... 28 7.3 Proposals ................................................................................................................... 28 7.4 Equipment Costs ........................................................................................................ 28 8 Mechanical and Electrical Engineering.................................................................28 8.1 Lighting....................................................................................................................... 28 8.2 Drainage..................................................................................................................... 28 8.3 Water Supply system ................................................................................................. 28 8.4 Environmental controls............................................................................................... 28 8.5 Electrical services....................................................................................................... 28 9 Environment, Health and Safety ............................................................................28 9.1 Environmental issues ................................................................................................. 28 9.2 Health and safety ....................................................................................................... 28 10 Cost Programming and Procurement ...................................................................28 10.1 Programme................................................................................................................. 28 10.2 Procurement............................................................................................................... 28 10.3 Cost............................................................................................................................ 28 11 Conclusion and Recommendations ......................................................................28 Appendix 1 Survey of users of Greenwich and Woolwich Foot Tunnels Appendix 2 Project environmental assessment of Greenwich and Woolwich Foot Tunnels Appendix 3 Hazard record and designers risk assessment Appendix 4 Design brief and specification for lift refurbishment Appendix 5 Outline description of the control and communications systems Page ii Greenwich and Woolwich Foot Tunnels Hyder Consulting (UK) Limited 2212959 C:\Documents and Settings\fchugtai\Local Settings\Temporary Internet Files\OLK1D\Appendix B Feasibility 06/05/2008 2 Report Final.doc 1 Summary This report, commissioned by Greenwich Council, describes the proposals for the refurbishment of the foot tunnels beneath the River Thames located at Greenwich and Woolwich. The Greenwich and Woolwich Foot Tunnels were originally constructed to the design of Sir Alexander Binnie in 1902 and 1912 and are 371 and 504 m long respectively and 3.3 metres in diameter. The tunnels are 15 metres beneath the River Thames. The tunnels were constructed from shafts built in cylindrical steel caissons from where they were driven in Greathead Shields in compressed air beneath the river and lined with cast iron rings. The tunnels and shafts are lined with concrete and faced with white ceramic tiles and the inverts are paved. Access to the tunnel is provided down the shafts either by spiral stairs or by lift. Each shaft is capped with a circular top works building constructed of brick, stone and reconstituted stone masonry with a glazed roof and a cupola of either cast iron or timber, which houses the lift motor room. The tunnels are Grade II listed buildings. The tunnels are to be refurbished to meet the following objectives: • Improvement in the environment for tunnel users; • Provide improvements where possible in access for the disabled in accordance with the principles set out under the DDA; • Extend the service life of the two tunnels as infrastructure assets; • Conservation of the heritage structures; • Presentation of the structures both visually and in the provision of interpretation. These objectives are to be met by carrying out works as follows: • Initially the tunnel is to be the subject of inspection, investigation and assessment