This week our surveyors have been in Lancashire undertaking a services identification survey on a bridge.
This is an unusual undertaking because we can see the services we are identifying. Usually we need to identify them via geophysical methods.
For this project, access to the underside of the bridge had to be agreed with the port authority and network rail and we had access to a section of the underside of the bridge with a scaffold where we could measure and sketch the services and their locations and take photographs. For areas where we did not have scaffold access we had to rely on photographs taken from ground level.
On the surface, we then undertook a traditional utility survey using the usual methods of interrogating existing drawings, lifting and inspecting chambers and geophysical location.
This approach provided us with two sets of data which under comparison has allowed us to positively identify the contents of the ducts crossing under the bridge deck.