Ground-borne vibrations

Vibration impact studies are frequently carried out near railway projects as they are part of the urban and city landscape. Their location and their daily use generate vibrations which can be perceived by the locals and cause significant noise pollution (noise of the passing train) and vibration in the floor and walls.

A7hz team is able to evaluate the way in which vibrations propagate in the ground by using a hammer provided with a viscoelastic cap: known as an impact hammer. The recording of impacts from different distances allows firstly to establish a diagram of the ground vibration attenuation and secondly, to predict their vibratory speed depending on the types of soil.

For example, the city of Montreal is built on a clay soil in which the transmission speed of low frequency vibrations is very high. A7hz is proud of having carried out these impact studies for projects such as Quebec City’s tramway, the Eastern Metropolitan Express Network or the Canadian Pacific and National projects.

Protection of sensitive equipment

With this kind of vibration studies, we are also able to guarantee the integrity of equipments, such as laboratory facilities, as we did for the Montreal Science Complex. The study will allow to evaluate the vibratory speeds that must be respected and to fix a threshold based on their strong sensitivity to vibration. This issue, which can be transposed to building projects near hospitals or clinics equipped with magnetic resonance imaging (MRI) devices, matches our field of expertise and we would be more than happy to provide our services for your future projects.

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