t n e m u c - Central Section - o D Fixed Installation Noise (D25) y c a Design Process – Fixed Plant g e L g EHSG Meeting, July 2012 n i n & r a e L This document is shared for the purposes of learning legacy. It is a snapshot in time and hence many of the links within the document will become obsolete over time. Some links/document references will refer to a document storage location that isn't accessible. Users should refer to the learning legacy website where these documents may be published separately.
t n e m u Contents c o • Part 1 D y IPD25 Targets & Status Update c a g • Part 2 e L Engineering & Contractual Context g n • Part 3 i n r a Application of Crossrail Design Criterion to the Design e Process L
t n e m IPD25 – Targets & Status Update u c o D y c a g Part 1 e L g n i n r a e L
t n e m IPD25 – Targets u c o • D25 Targets – BS4142 Approach D y c a g Noise Levels Relative to Background e L g n i 10dB ‘Reasonable Endeavours’ Range n r a -5dB below Background +5dB above Background e ‘Further Endeavours’ ‘Crossrail Assessment Criterion’ L 0dB Background
t n e m IPD25 – Fixed Installations u c o D Main Fixed Plant Noise Sources: y c • Tunnel Ventilation Fans, a g • Mechanical Plant at Crossrail Buildings (e.g. e L ventilation and air conditioning equipment) g • Electrical Trackside Equipment n i n • Power Supply Facilities (e.g. Transformers) r a e L
t n e m IPD25 – Assessment Assumptions u c o • Conservative approach currently adopted D y for Reference Design: c a - IPD25 refers to ‘ normal operation ’ g e - However, FDC assessments are based L on Tunnel vent congested-mode, late g n at night or early morning i n r - In practice, a very unlikely scenario, a e hence considered to be worst-case L - Conventional plant assumed 24/7
t n e m IPD25 – Assessment u c o • Preliminary assessments are based on: D y - BS4142 Rating Method c a - Cumulative impact of site development g e L - Determined at worst-affected receptor g - +5dB character correction in all cases n i n - Typical operational hours over a week r a - Predicted for the worst 5-mins (night) e L - Additional allowances for calculation uncertainty
t n e m IPD25 – Status Update u c o • Engagement of Framework Design D y Consultants (FDCs) c a • Development of Reference Designs by FDCs g e for Power, Portals, Stations and Shafts L • Presently 22 Development Sites have been g n considered i n r • 10 - Forced Ventilation Shaft Sites a e • 12 – Sites with other Fixed Installations L
t n e m IPD25 – Status Update u c o • Development of the Method for Establishing D y Background Noise Levels for IPD25 c a • FDC Background Noise Surveys/Reporting g e using the standard grid of L A90,1hr dB values: L g n i n r a e L
t n e m IPD25 – Status Update u c o • ‘Jointly Established’ & Agreed Background D y Noise Levels with Local Authorities c a • Preliminary D25 Noise Assessments of g e FDC Reference Design – Reviewed by CRL L • Individual D25 Presentations to Local g n Authorities by Station FDCs i n r • Next step: D25 Communication to Local a e Authorities of Preliminary Assessment L Findings (Worst-case Cumulative Levels)
t n e m IPD25 – Status Update u c o • IPD25 Contract Specifications Completed D y and Included in the relevant tender c a packages (ITTs) as follows: g e L 1. Deep-Level Stations g 2. Shafts and Portals n i n 3. Surface Rail and Surface Stations r a e 4. Tunnel Ventilation (Systemwide) L 5. Traction Power Transformers
t n e m u Engineering & Contractual Context c o D y c a Part 2 g e L g n i n r a e L
t n e m u Engineering & Contractual Context c o Context: IPD25 Introduction - Paragraph 1.5 D y “ To avoid a significant noise impact from the tunnel c a forced ventilation fans, noise attenuators will be g e designed and installed on each side of the tunnel L ventilation fans, as necessary to meet the Crossrail g assessment criterion for fixed plant ” n i n The preliminary assessments support the above, r a indicating that the tunnel ventilation fans are the most e L significant fixed installation noise sources on the Crossrail project
t n e m Crossrail - Central Section Works u • Tunnel structures and station, intermediate c o shaft and portal structures & mechanical and D electrical systems y c a g • Systemwide (railway systems, tunnel systems) e L g n • Complexity: i n r – Complex packaging of delivery responsibility a e – Complex project timeline L
t n e m u c o D y c a g e L g n i n r a e L
t n e m High Level Timeline u Now c o Tunnels / Station / Shaft / D Tunnelling / Civil Works Portal Detail Design y c Station / Shaft / Portal Space a Mechanical & Electrical Fit Out proofing g frozen e L Systemwide Reference Systemwide Systemwide Equipment g Design Procurement Detail Design Procurement n i n r Systemwide Installation a e Provisional Demonstration L Findings Reports 2018 2017 2014 2015 2016 2011 2012 2013 2010 2009
t n e m u Summary of Responsibilities c o • C610 – Systemwide Main Works Contract D includes detail design and provision of the y c Tunnel Ventilation System for central section a g e • Station contractors will be responsible for the L buildings’ ventilation and air -conditioning plant g n • Preliminary assessments by station and shaft i n designers indicate that the Tunnel Ventilation r a e System is the fixed installation with the L dominating noise contribution • C610 and station contractors will interface
t n e m u Tunnel Ventilation System c o • Required to: D – Relieve pressure resulting from train movements y c → Draught Relief Shafts a – Remove heat dissipated by running trains g e → Under Platform Extract L – Cool trains stationary in tunnel (Cooling / Congestion) g → Cooling n i – Control smoke from a train fire n r → Smoke Control (Emergency Situation) a – Provide ventilation during tunnel maintenance activities e L → Maintenance Ventilation
t n e m u Draught Relief Shafts c o Draught Draught Draught Relief Relief Relief D Shaft Shaft Shaft Tunnel Entrance Station y c Ground Level Ground Level a g e L • Needed to relieve the pressure generated by g train movements n i n • Provides passive ventilation and cooling r a e L
t n e m Under Platform Extract u c Draught Draught o Relief Relief D Shaft Shaft Station y c Ground Level Ground Level a UPE g e L g • Required to remove heat from trains stopped at n i the station n r a • Provides active cooling of tunnel e L
t n e m u Cooling / Congestion c o Draft Draft Forced Draft Relief Relief Vent Relief D Shaft Shaft Shaft Shaft Tunnel Entrance Station y c Ground Level Ground Level a g e L • Required to cool trains stationary in Tunnel g n • Only required if Train remains stationary in the i n tunnel for more than 6 minutes r a e L
t n e m u Smoke Control - Fire in Tunnel c o Draught Draught Draught Relief Relief Relief D Shaft Shaft Shaft Tunnel Entrance Station y c Ground Level Ground Level a g e L • Required to Control Smoke g n i n r a e L
t n e m u Smoke Extract - Fire in Station c o Draught Draught Forced Draught Relief Relief Vent Relief D Shaft Shaft Shaft Shaft Tunnel Entrance Station y c Ground Level Ground Level a g e L • Required to extract smoke g • Keeps station evacuation routes clear of smoke n i n r a e L
t n e m u Route Map c o D Eleanor Street Liverpool Street Bond Street Fisher Street Stepney Green y c a Mile End Tottenham Court Road Farringdon Whitechapel Paddington g e Limmo L g Canary Wharf Woolwich Intermediate Shaft with No Tunnel Ventilation n Intermediate Shaft with Cooling only i n Station with Cooling & Draught Relief r a Station with Cooling, UPE & Draught Relief e L
Typical Station t n e Section m u c o D y c a g Typical Dimensions: e • Fan Size: 2.8m diameter L • Duct Size: 30m^2 g • Attenuator Dimensions: n • 3m long i n • 60m^2 r a e L
t n e m u c Residential receptor o D y c a g e DRS L g FV n i n r Typical a e intake / outlet L arrangement
t n e m u Operational Modes c o • Under Platform Extract (UPE) D y – Cooling of trains running normally c a • Cooling / Congestion (Worst Case Noise) g e – Cooling of stationary trains in tunnel L • Maintenance g n – Ventilation of tunnel maintenance activities i n r – Tunnel Ventilation System test a e • Smoke Control L – Noise not considered because emergency response
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