for a long time, the 290 m long kattwyk bridge was the largest lift bridge in germany. at the end of 2020, the new kattwyk rail bridge was opened next to it as a double-track railway bridge. the old kattwyk bridge was then renovated and converted into a road-only bridge the year after.

the first phase of work was awarded to robert krebs gmbh, a corrosion protection company. soot, bird droppings and loose paint residues were to be cleaned off of a surface spanning just under 27,000 m². two trail jet 30 hot water jetting units with 500 bar of working pressure that each supplied two handheld lances were used for this substrate preparation work. as a result, the bridge could be washed from both sides at the same time, with two jets on each side. the cleaning work was carried out with superb speed and thoroughly thanks to the speed-adjustable pointspeed regulation 5 4/2 rotor nozzle.

in the second phase, the steel construction specialists from aug. prien, a hamburg-based construction company, took on the water jetting work. aug. prien was a partner in the integrated project alliance (IPAK5). to make sure progress was as quickly as possible, several ultra-high-pressure jetting systems were used: two trail jet 125 units (125 kW / 2,500 bar), one trail jet 250 (250 kW / 3,000 bar) and one wheel jet 11 mobile high-pressure cleaner (300 bar), not to mention the line worker 250 for floor stripping. two surface rob 250 water jetting robots and several hundred metres of hose.

some 8,000 m² of surface in total had to be stripped. the individual tasks proved to be quite different: on about 2,200 m², an asphalt layer measuring roughly 1 cm thick had to be removed. this wasn’t a problem for the surface rob 250; the working pressure of 2,500 bar was adequate here. the 600 m² of pavement surface measuring 6 mm thick was also removed effortlessly with the line worker 250 and the surface rob 250. the elastomer bitumen coating between the bridge’s steel surface and the asphalt pavement, on the other hand, turned out to be a tough nut to crack: this granular coating had completely eaten into the steel surface. this was a challenge for the trail jet 250 with 3,000 bar working pressure and the surface rob 250 – but, in the end, this layer was successfully removed from the bridge, too.

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