Main Works Civils Contract C2

Transcription

1 Main Works Civils Contract C2 Simon Matthews Interface Manager Eiffage Kier JV Main Works Civils Contract 1MC07-CEK-SE-PRE-CS07_CL

2 Outline Introductions MWCC Delivery Stages and Outcomes Design Approach Construction Approach C2 Main Works in Chiltern District Short Term Works Community Engagement

3 HS2 Delivery

4 Eiffage Kier Joint Venture Experienced multi-national joint venture Eiffage have successfully delivered 180km Bretagne-Pays de la Loire high speed line in France 26 Mm 3 Earthworks 240 structures Rail systems track, signalling and OLE Kier brings major project experience from Hinkley Point, Crossrail, etc.

5 Stage 1 Outcomes Scheme Design Stakeholder Dialogue Delivery Proposals Supply Chain Engagement Proposal to HS2 Ltd

6 Stage 2 Delivery Commences March Access Dates Clear Route for Earthworks Completion Q Handover to Rail Systems

7 15 Main Earthworks ID Task Name Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q Q2 1 Information gathering 2 Option Selection 3 Develop Scheme Design 4 Develop Methodology 5 Initial Public Engagement 6 Pre-application Engagement 7 Gateway 5 Draft Final Submission 8 Gateway 6 Final Submission 9 Notice to Proceed 10 Prepare Submissions 11 Detailed Design 12 Stage 2 Commencement 13 Site Mobilisation 14 Highways and Structures

8 Design Approach Understand Requirements Evaluation Option Selection Stakeholder engagement Key & Common Design Elements

9 C2 Main Works in Chiltern District Wendover Dean Viaduct Leather Lane Overbridge South Heath Cutting and Overbridges

10 Chilterns AONB Design Principles Landscape character Overbridges Viaducts Noise Barriers

11 Wendover Dean Viaduct The relative simplicity of the backdrop of this viaduct suggests a matching simple and elegant structure.

12 Reference Design 40m uniform spans Exposed abutments and wing walls Uniform concrete colouring Significant concrete volumes

13 Latest Proposals Increased spans reduces piers Innovative design reduces girder depth and concrete Detail around light and shade Tapered piers combines structural stiffness and tailored, slender form

14 Structural Form Innovative double composite form reduces girder depth Use of precast concrete reduces on-site works Lighter structure needs less foundations

15 Slendernes s Maximise apparent slenderness of piers through cross section, grouping and edge profile Curved profiles introduce interesting variation of shadow and light and shade adding interest and increasing apparent slenderness.

16 Key Benefits Elegant structure aligned to the DDP More efficient structure saving concrete, lorry movements, site activities, nuisance 15,000m 3 saved = 2,500 less concrete truck movements Launched construction method less impact on ground, safer, less personnel

17 Construction Approach Site readiness by EWC Site Clearance incl. Utilities Offsite mobilisation Create site infrastructure from March 2019 Highway access Compounds Site logistics route Temporary drainage Fencing Pre-earthworks drainage Structures Highways & PRoW Bulk earthworks Protection layer Drainage

18 Principles of Mass Haul Identify areas for placement Use the right material in the right place Construct overbridges and viaducts to enable material movements within the trace Move material once and deposit material as close to the source as possible Utilise modern plant, methods and equipment

19 Traffic Routes Determine traffic movements Measure against ES Discussions ongoing with Bucks CC Identify requirements and prepare Local TMP by Jul-18 Route Plans and S.17 applications to be prepared from Aug-18 Main route from M40

20 Additional Ground Investigation Further GI planned from May 2018 Provide further design input Reduces risk in time, cost and assurance

21 Interface with Align Regular meetings Defined ownership of issues Identified phasing of the works Working together on Design development Traffic movements Engagement Undertakings & Assurances

22 Future Engagement Common message Understand community issues Tiered sharing of design proposals Parish Council Meetings Public Exhibitions Mar / Apr-18 Jul / Aug-18 HS2 Ltd Enabling Works Main Civils Initial discussions with local representatives County and District Councils Parish Councils Community Groups Schools Engagement from May-18