When construction company Matthäi was hired to complete the resurfacing of the busy B420 road around Fürfeld in Rhineland-Palatinate, Germany, it turned to paving company GMS Fahrbahnsanierungen and Topcon technology to help meet tight deadlines and navigate tricky working conditions.
Using the SmoothRide solution, Matthäi and GMS were able to optimise the recording and use of data during the project, to ensure the work was completed quickly and without complications.
One of the biggest obstacles Matthäi and GMS faced with this project was avoiding heavy traffic jams caused by road closures. Because of this, the decision was made early on that work could only be undertaken during the weekends. To meet these tight deadlines, teams had to work across three weekends in total, resurfacing a one-kilometre section each time. Over the course of the project, this meant around 40,000 square metres of asphalt surfacing and binder needed to be used, with 9,000 tons of material being milled, shifted and laid again.
Turning weeks into days
Traditionally, the surveying process for resurfacing a road is a time-consuming task that can lead to expensive errors. Surveyors hammer pegs into the ground every five metres along the hard shoulder, then they need to measure the transverse profile every 20 metres, evaluating all the photos, drawing up marking schedules, and ensuring all the relevant data is documented. Using this method, the design of the complete road would likely have taken around two weeks. Instead, the Topcon team utilised a RD-M1 scanner on the roof of a car and drove down the entire stretch of road in less than an hour. They were able to record millions of points in this way in just 50 minutes.
“On the basis of a thinned-out point interval of 30 centimetres, we received a complete image of the road, “ explains Frank Pohl, surveying team leader at Matthäi, and continues: “We then discussed the critical zones and found solutions to various problems quickly. The team were able to smooth out uneven spots in the planning model that could have caused further problems and optimised the geometry in such a way that the incline of the new asphalt surface was a constant 1.5 per cent – leading to a perfect end result. The curves on the road were also given equally smooth gradients, and this traditionally time-consuming planning phase was completed in just two days.”