Monitoring the surroundings
‘A construction or renovation project is practically never without risk. The work must be monitored with an eye to the legislation and regulations. Monitoring makes it possible to keep the risks of the construction or renovation project under control for the surroundings and in case of claims. SOCOTEC measures vibrations in accordance with the KOMO BRL 5023 assessment guidelines – “Measuring vibrations” and SOCOTEC’s sound-level meters meet the requirements of NEN-61672, Class 1.
The advantage of monitoring the surroundings is that the contractor can carry out the project using a risk-based approach. In addition, this data is very important for handling any damage claims.
For almost all projects, work is carried out that causes vibrations. Heavy transport also leads to vibrations that may cause damage in the vicinity. The intensity of the vibrations depends on various factors such as:
- The type of work (piling, boring and drilling, demolition, pumping, etc.)
- The type of transport and equip,ent (lorries, vibratory plates, pile-drivers, demolition equipment, etc.)
- The type of underground and infrastructure (soil structure and soil condition, brick paving or asphalt paving, etc.)
- The distance from the source of the vibrations to the neighbouring buildings and structures in the vicinity
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SOCOTEC conducts its vibration measurements in accordance with the BRL 5023 assessment guideline “Measuring vibrations”. Measuring in accordance with the KOMO BRL 5023 assessment guideline means that all the measurements are carried out in accordance with the highest quality standards. The equipment is calibrated every year. A third, official party tests and checks the measurements carried out. This offers clients certainty and a reliable, high-quality product.
During building work in inner cities, the area is subjected to construction noise. This can inconvenience those in the vicinity, for example homes, schools and companies. In the Netherlands, only a certain number of decibels of construction noise many be caused for a certain period. The Building Code also indicates that a noise measurement must be carried out for inner city building activities.
SOCOTEC has its own advanced sound-level meters that register the noise level. These meters meet the requirements of NEN-61672, Class 1.
Our measurements are conducted in accordance with the guidelines of the 2010 Construction Noise Circular.
With most construction and/or demolition projects, there is a risk that settlement will occur in neighbouring or surrounding buildings and structures, within the activities’ range of influence. This settlement may occur, for example, as a result of vibrations coming from the work, excavation near to neighbouring constructions or pumping at the project location. Settlement in the vicinity can have major, negative consequences for neighbouring constructions and structures.
SOCOTEC can measure the settlement nearby using different types of deformation measurements. Both manually and continuously.
A height measurement is a measurement of the surrounding constructions and/or structures in the Z-direction compared to the Amsterdam Ordnance Datum (NAP). Prior to the work, a single or double baseline measurement is carried out that will serve as the point of reference. This will make it possible to observe any deviations from this baseline during or after the work by repeating the measurement. In this way, it can be determined whether any settlement has occurred.
During work on or near to an embankment, repairs to foundations, work near to tracks or during excavation work, there is a risk of settlement. To monitor any possible deformations to these structures, SOCOTEC can carry out measurements of the X-Y-Z coordinates. This consists of placing and measuring measurement marks (for example stickers or prisms) on the buildings / structures to be monitored. Using a total station, the measurement marks are triangulated, departing from a local coordinate system or the national coordinate system (National Triangulation system).