Project for the new SB 300 Fixed-Width Screed from VÖGELE: the fixed-width screed demonstrated its benefits right from the start during a project to lay a major road. It processed complex materials such as porous asphalt and stone mastic asphalt in large widths. The result is a convincing one.
Fixed-width screeds are frequently used when large widths need paving without joints. This was the case for a new section of the B75 in Hamburg, called the ‘Wilhelmsburger Reichsstrasse’. This major road runs alongside the railway tracks for a distance of approximately 4.6 km. Bundling two large traffic routes in one place means that both the town and its inhabitants gain space and the noise pollution of the busy road is reduced for those who live nearby. Paving was performed by a SUPER 2100-3i-type tracked paver. This Highway Class paver of the ‘Dash 3’ generation from VÖGELE is the machine of choice for a great many highway projects.
When processing materials, compaction performance and the floating behaviour of the screed are of key importance. Both are highly dependent on the correct tamper setting. With hydraulic tamper stroke adjustment for the new fixed-width screeds, VÖGELE delivers an innovation which allows tamper stroke to be adjusted at the push of a button. It can be selected between 4 and 8 mm, the important point being that 4 mm are recommended for thin layers such as binder and wearing courses, whilst a stroke of 8 mm is recommended for thick base courses.
Iske is referring to a key new feature on the SB 300: the hydraulic bolt-on extension. This extension to the outside of the screed can be extended hydraulically – by 1.25 m on each side, so a total of 2.5 m. This enables VÖGELE to combine the advantages of its extending screeds with those of the fixed-width screeds: a high degree of flexibility plus maximum evenness. On this large-scale job site, the Kemna Bau paving team pushed this advantage, too, almost to the maximum: pave width varied by around 2 m.
Two new/further developments on the SB 300 and SB 350 Fixed-Width Screeds ensure that they are ready for action quickly: the guide and positioning system and the electric screed heating system. Whilst the guide and positioning system helps users fit the extensions correctly, the electric heating system brings the screed to operating temperature more quickly and more evenly than the preceding model.