The presented system is intended to monitor bridges in two cycles of their operation: construction
and service. It consists of independent recorders which register strain/stress, acceleration and temperature.
The recorders operate in tandem with a portable outside computer only in phases of preparation, testing
and saving measurements. They are characterised by high reliability of measurement achieved due to a duplication
method of strain/stress measurement and a reasonably low price. The paper presents some examples of
system trial implementations. The first instance concerns monitoring of structure creation, from system installation
in steel structure factory through transport of particular elements, assembly of structure on a construction
site and concreting of a deck to a disassembly of shuttering. The second example focuses on the monitoring
of a bridge construction via the process of launching steel girders with a composite reinforced concrete
deck slab and during bridge load testing and service.