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Facilitating maintenance and future works to manage growth in London

Katie Gabbett of Murphy Surveys explains why the company was chosen to establish the new DLR control network. P

lanning of future Docklands Light Railway (DLR) services – including extensions – is part of a strategy to manage growth in London. This strategy is developed across all parts of Transport for London (TfL) and is co-ordinated by TfL’s Planning department. The department has contracted Murphy Surveys to establish a control network on the DLR for asset identifi cation and to facilitate maintenance and future survey work.

The primary control network survey will cover 35km of track and 45 DLR train stations. It will be co-ordinated to the London Survey Grid (LSG) and height datum, and performed in accordance with the applicable industry standards.

The survey, which will begin this month, includes installation of street-level baseline control at 18 of the stations, precise levelling to three OS benchmarks per station (for street level control), installation of control on all 100 station platforms, track survey control along the entire route, GPS checks, traversing from street level to platform and track, co-ordination of platform and track control, and precise double-levelling of all control points.

Murphy Surveys was selected due to their advanced technologies, and vast experience with the installation and co-ordination of GPS site control over long distances, particularly in the rail sector. Accuracy and timeliness are highlighted as critically important by TfL,

and site

access is the primary challenge. Surveyors will need to work night-shifts, completing the most complex works on Saturday nights when the engineering hours are extended.

Murphy Surveys uses only the latest equipment and technologies, which are proven to reduce risks e.g. data loss, and to improve cost and time effi ciencies. Traverse observations will be performed with the Leica TS30 total station, one of the most accurate instruments on the market, achieving half- second angular accuracy and sub-millimetre distance measurement. Other market-leading equipment that will be used includes Leica’s 1200 Series GPS Smartnet RTK and DNA03

J. A. Rattigan’s Charlene Fitzgerald says the company has become the most trusted and respected name within suction excavation hire by focusing on customers and their ever-changing needs.

‘Amazing pieces of kit’ At

J.A. Rattigan, we offer a fl eet of suction excavation all with different capabilities,

allowing us to supply correct machinery for the task in hand.

With our can-do policy we ensure every job is completed to the highest standard, nationwide.

Suction excavation manager Kevin Burke has brought a wealth of knowledge with him since joining the company in early 2013. He is extremely hands-on, and conducts regular site visits to ensure we always adopt the best methodology to carry out the task we have been assigned to do to a very high standard.

As you are all aware, the biggest issue in maintenance work is the short working windows within which we all have to operate, and the ever-increasing demand on effi cient timing solutions for all rail maintenance, never mind the effect striking a cable could have in

44 | rail technology magazine Aug/Sep 13 terms of disruption to the network.

That is why, with these amazing pieces of kit, it is now possible to carry out treble the amount of work that could be done by six or seven people with just two operators. This enables us to guarantee virtually no risk of strikes or over-runs, which (as many commuters will know) causes peak-time disruption that can be avoided by using a suction excavator.

We are able to work 120 metres from the truck by way of extension pipes, which are quick to install and dismantle.

The scope of work is endless: post holding- up work; level crossing work; station work; embankment work; under-gully clearance; and track clearance.

We can also work at height by raising the boom to an upright position on the suction excavator.

These machines can lift any material – ballast, brick, concrete, sludge, water, sewage or sand.

All our operators are PTS trained and very knowledgeable in their trade. See how we can help you with your current or future projects.


For a demonstration contact Kevin Burke. E: W:

Precise Digital Level. Secure cloud-based data exchange between site and offi ce will enable the project manager to oversee and report on the results of the survey in real-time; ensuring works are completed to specifi cation.


T: 0203 602 6827 E: W:

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