Text version of the page

Special designs 9

Noise-reducing surface (optional)

Especially in urban areas, expansion joints should be as noise-free as possible. mageba has therefore developed modular expansion joints with an optional noise-reducing surface. The unique patented “sinus plates” with their “teeth” design eliminate straight edges perpendicular to the direction of travel and ensure that vehicles travelling over the joint continuously grip the surface. In this way, noise generated by vehicles travelling over the joint is greatly reduced.In contrast to finger joints, there is no restriction on the type of traffic allowed to travel over modular expansion joints with sinus plates. The special design of these sinus plates also permits cyclists to pass over the joint safely.It is also possible to retrofit existing modular expansion joints with the noise-
Lamella joint with sinus plates Lamella joint after installation Installation of the lamella joint by specialists reducing sinus plates. This requires the surface level of the asphalt adjacent to the joint to be increased by approximately 20mm.Expansion joints with sinus plates are very suitable for use on bridge structures in residential areas and in other areas that are sensitive to noise.At an independent test facility, fatigue testing was carried out

Testing and noise measurements

on a section of lamella beam with bolted-on sinus plates. The durability of the sinus plates and the bolted connections was thus proven.Noise measurements carried out on different structures by an independent facility have shown that modular expansion joints with sinus plates are significantly less noisy (up to 70% less noise generated by traffic) than other types of expansion joints –
Difference in Amplitude (dB) of different joint types Noise Level (dB) see adjacent graph.Detailed documents on fatigue testing and noise measurements are
Noise level (dB) 0.02.0 4.0 6.0 8.010.0 available upon request.
Roller shuter (450 mm movement range) Roller shuter (450 mm movement range) Modular Expansion Joint (400 mm movement range) Modular Expansion Joint (400 mm movement range) Mat Expansion Joints (100 mm movement range) Mat Expansion Joints (100 mm movement range) Cantilever Finger Expansion Joint (150 mm movement range) Cantilever Finger Expansion Joint (150 mm movement range) Modular Expansion Joint with Sinusplates (400 mm movement range) Modular Expansion Joint with Sinusplates (400 mm movement range) Principle of the FUSE-BOX

FUSE-BOX: earthquake design

The patented FUSE-BOX protects the joint and adjacent structure from damage during an earthquake. If the expansion gap at the end of a bridge deck closes more than a conventional expansion joint can handle during an earthquake, this can result in severe damage to the structure. In order to avoid such damage, it is recommended to equip the expansion joints with the mageba FUSE-BOX.Modular expansion joints equipped with the Fuse-Box are used in areas with high risk of earthquakes. They not only reduce possible damage to the structure, but also ensure that, following an earthquake, emergency vehicles are able to cross over as soon as possible. mageba also delivers
Normal conditionOpen beyond maximum (earthquake)Closed beyond maximum (earthquake)Situation after earthquake other earthquake safety systems upon request.