MJ Rees has been involved in numerous jobs where the REDUCT system has been successfully employed on site. Reduct is a unique gyroscopic tunnel and pipeline mapping system which produces accurate coordinates of the utility being surveyed.
Reading Station is one of the busiest parts of the country’s rail network. In 2010 the redevelopment to decongest the railway and improve passengers’ journeys started, the works include the construction of new track and platforms, a new passenger footbridge, a viaduct to the West of Reading and the widening of the rail bridges over Cow Lane. The project is scheduled for completion in summer 2015.
In spring 2012 M J Rees were appointed to locate a section of approximately 160m of storm sewer running underneath the track and platforms. It was thought the sewer followed a straight line and varied in size from 1050mmdia to 1100mm x 800mm (oval). There were issues with the flow.
We prepared the risk assessments and method statement and liaised with the asset owners to put in place all necessary Permits to Work. The sewer was jetted then our surveyors transferred coordinates from the existing Reading Station Redevelopment survey control from the surface into both storm chambers.
The alignment survey was undertaken at night, working between the coordinated points using the Reduct Survey System.
The sewer run was measured four times, twice in each direction. All runs were valid and showed a high degree of repeatability. XYZ results were checked and then plotted in CAD onto the existing topographical survey and checked against the piling design.
Departures from the expected sewer alignment in xy and z resulted in the need to make adjustments to the piling locations. This phase of the construction then went ahead, with confidence and without infringing on the sewer easement. It was also found that the sewer was a 640mm dia structure, not variable as had been historically recorded.
