Track Survey for Rail Engineering Consultancy
Track Survey for Rail Engineering Consultancy Summary:
The project remit is to provide topographical track surveys and structural clearance gauging profiles through areas of London North East and Midlands territory routes controlled by Network Rail. The final survey deliverable will allow for proposed speed improvement designs to be drawn up and implemented.
Access through Network Rail Infrastructure, requiring Linkup Accreditation, Proof Audit, PTS accreditation for all surveyors involved and COSS certification for some surveyors on appropriate tasks.
In total the specification covers 10 ELR’s:
- DBP1 (Derby to Tamworth), Eight survey sites totalling 23,731yds.
- DOW (Doncaster to Scunthorpe), Seven survey sites totalling 13,413yds.
- HUL1 (Hull to Selby), Six survey sites totalling 26,853yds.
- HUL3/4 (Selby West Jcn to Cross Gates), Seven survey sites totalling 11,852yds.
- MAC3 (Darnell to Retford), Three survey sites totalling 14,452yds.
- NEC2 (Stocksfield to Carlisle), Ten survey sites totalling 27,793yds.
- SPC2/3 (Bedford to Market Harborough), Eight survey sites totalling 27,214yds.
- SPC5 (Leicester to Trent South Jcn), Five survey sites totalling 21,063yds.
- SPC8 (Derby to Clay Cross Tunnel), Four survey sites totalling 27,327yds.
- SPC9 (Clay Cross Jcn to Chesterfield), One survey site totalling 4,500yds.
To enable the works both present and in the future, a high accuracy geodetic control network (engineering grid scale factor of 1) had to be established for each of the above mentioned ELR’s, areas where an existing survey control network had previously been established were verified and the coordinates adopted.
Severn Partnership commissioned three new custom site grids using SnakeGrid software, to cover:
- Doncaster through Scunthorpe to Barnetby (DOW2011 SnakeGrid)
- Hull to Leeds (HUL2011 SnakeGrid)
- Newcastle to Carlisle (NEC2011 SnakeGrid)
Each survey control network, consists of Primary, Secondary & Tertiary Control. Primary control was established along the length of the route at 4Km intervals, located well away from the operational railway. A further network of Secondary control station pairs were established at 1Km intervals, with a further network of Tertiary control stations constructed at 200m intervals. Secondary & Tertiary control stations were set in concrete to a minimum depth of 600mm. Each Primary & Secondary control network was observed utilising high accuracy GNSS (GPS) receivers and double levelled with precise digital levels.
A mayjor part of the project objective was to undertake all elements of the survey works in a Green Zone Environment, Red Zone working only being sanctioned where Line Blockages and Possessions have been refused resulting in a delay to the programme. Rule of the Route possessions are utilised where possible for weekend working.
Severn Partnership have worked in conjunction with Possession Planners to enable all survey works to be carried out utilising Midweek Line Blockages; booked through the GAZAC nominally one week in advance and Weekend T3 Possessions booked through the PPS nominally ten weeks in advance. We ensure attendance at pre-possession PICOP’s meetings to avoid our requirements for the survey being overlooked in favour of heavy engineering works.
A weekly excel spreadsheet is completed detailing the areas in which we are working and the amount of Red Zone / Green Zone working, which is shared with the client.
To date all work has been completed in a Green Zone environment and with a detailed schedule and work-plan all future work will be also.
All the required agency safety staff (COSS, Sitewardens, PCs, Lookouts, Handsignalmen) excluding ES & PICOP are booked and arranged by Severn Partnership Project Managers.
Between 2011 and 2012, a total of 30 sites were delivered ahead of schedule, using a combination of daytime, Midweek night and weekend blockages.
For more information please email us at firstname.lastname@example.org or speak to us on 01952 676 775.