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Clark-Drain linear drainage and access covers installed at Liverpool Lime Street

The refurbishment of platforms was part of Network Rail’s government funded National Stations Improvement Programme (NSIP). The five year programme aims to deliver £179 million worth of station improvements to a minimum of 150 medium sized stations in England and Wales.

An overarching objective of the programme is to achieve a noticeable improvement to the passenger perception of stations whilst providing value for money in station investments.  Part of this remit involves aspects of customer comfort and safety, including ensuring that the control of surface water runoff is efficiently and effectively managed.  For this project Murphy Group were commissioned by Network Rail as the main contractor.

Clark-Drain has provided a total of 740m length CD 434 linear drainage channel for installation in three of the station‘s platforms to drain the surface water at a maximum rate of 4.6 l/s into silt box traps before discharge into the mains.

The silt boxes work by retaining runoff to allow deposited silt to settle to the bottom of the basket before the water is discharged via the outlet pipe connection. The basket is located so that it is easily removed for periodic cleaning.

Both the channels and silt boxes are compact, lightweight and designed for easy handling, installation and maintenance. The bodies of the channel are constructed from recycled hard wearing polypropylene to protect them from damage and ensure long lasting durability. A BS EN 1433 Class B125 quick-fit “CatchLock” grating retention system provides all the strength required for the 12.5 tonne loadings it was designed and tested to withstand and perfectly suits high trafficked station platforms. The narrow-slot “heel-guard” design reduces the potential for tripping and slipping and provides a useful safety feature for passengers and rail staff.

The weight of each one meter length, at 5 Kg, made it very easy to install enabling Murphy Group Engineers to lay several lengths in one go for faster levelling and taking 25% less building time than traditionally heavier polymer concrete options.

As part of the aesthetic appeal of the platform refurbishment, the CD 434 was specified because of its ability to follow the curve of the platform edge, giving uniformity and enhancing the visual appearance when laid to the same contour.    

In addition, the linear drainage channel was supplied with 750 x 600, 600 x 600 and 450 x 450 steel recessed covers and frames. These enabled 60 of the stations lighting cable access chambers to be securely covered and in-filled with the marble effect paving specified for the station floor as part of an attractive and functional design for the public to enjoy.                

When asked why Clark-Drain products were selected for the project, Richard Smith of Murphy Group commented, “To summarise our use of the CD 434 channel I would say its main benefits are ease of handling due to the lightweight nature of material used, ease of installation and the robustness of the product. This is a major plus and reduces waste. Due to the fact that it doesn’t corrode the finished gratings also looks better than cast alternatives.”

- Uploaded 28/08/2014