Adaptable Drainage Solution for Old Oak Common Crossrail Train Depot

Municipal castings
Greater London
Gully Gratings
Galldris Construction LTD
Municipal castings
crossrail logogalldris logo

The Issues Faced

Supplying a grating system to Galldris that would not damage pre-existing infrastructure and have reduced whole life maintenance costs.


Galldris needed a grating solution to remove surface water, which they could install without damaging the underfloor heating in the Operation, Maintenance and Control (OMC) building, at the Old Oak Common Crossrail Train Depot.


A grating system that offers a variety of installation techniques from Saint-Gobain PAM UK has enabled Galldris Construction to fit almost two kilometres of the product to remove excess surface water inside the new Old Oak Common rail maintenance building for Crossrail trains. OMC building is part of a £150m new rail depot on the site.  It will have nine roads, or rail tracks, for the maintenance of the nine carriage 200 metre plus long Crossrail trains.
One of the nine roads in the OMC will be used as a heavy washdown facility, while the drainage for the other 8 roads will need to remove rainwater runoff from the trains.  Galldris construction, who is responsible for the OMC’s civils package, needed two kilometres of grating in total.
As part of that contract, Galldris had completed pilecaps and drainage, before starting reinforced concrete works.  Another contractor installed heating pipes on the bottom reinforcement mat during the reinforced concrete construction.

The Value

Saint Gobain-PAM UK’s Mecalinea grating offered installers a number of different options to secure it in place; like any other grating it can be fixed in place using a bolt or screw, or for the areas where the underfloor heating is nearby its profile allows installers to use non-shrink pourable grout.  Lengths of the system can also be joined together using connecting pieces in its centre, making the whole grating system stronger and more durable.
Water for the heavy washdown road will run through the grating into a channel and be removed by drainage outlets spaced approximately every 30 metres, while the rainwater run off in the channels on the other 8 roads has one outlet and will generally evaporate.
Says Barrie McElhinney, project manager for Galldris Construction:  “Installing drainage channels to remove the surface water in the OMC building provided us with an unusual problem due to the proximity of the underfloor heating.   The flexible fixing options offered by Saint Gobain PAM’s Mecalinea grating really helped us solve this.”

See also

An interface between the roadway and the network