Monitoring during construction projects of movable bridges and harbour locks
De Backer, H.; Outtier, A.; Van Bogaert, P. (2013). Monitoring during construction projects of movable bridges and harbour locks, in: Yazdani, S. et al.ISEC 2013 - 7th International Structural Engineering and Construction conference: new developments in structural engineering and construction. pp. 467-472. https://dx.doi.org/10.3850/978-981-07-5354-2_St-34-83
Monitoring of structural parameters during construction can be an important aid during execution. Especially when studying the long-term behavior, e.g. build-up of ground pressures or fatigue effects, it can become necessary to resort to monitoring. This paper discusses two such projects. A first project deals with the refurbishment of a lock door of the Port of Zeebrugge, Belgium. To allow for refurbishment, the ground water level in the door chamber had to be lowered considerably. As a safety measure steel struts were added, going through the lock door. Since uncertainty existed concerning the size of the ground pressure variation, a monitoring system was installed to measure the normal forces in the struts and alarm levels were defined. A second project is concerned with the refurbishment the counterweight structure of the bascule bridge crossing the Van Cauwelaertsluis, one of the important lock allowing entrance to the Port of Antwerp, Belgium. Because of uncertainty about the size of the stress cycles during bridge operation, strain gauges are installed during renovation before any of the axles connecting the bridge to the bascule system are installed. Afterwards, stress build up will be monitored during construction phases, as well as test operation of the bridge. This article gives an overview of these experiences and on the lessons learned concerning power supply, possible electromagnetic interference and structural consequences.
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