Table foundations for turbines have beenan almost universal practice in the past.Thick base mats were required as a dy-namic “counter mass” to prevent significant settlement, especially in case of poor subsoil conditions. More than 40years ago, GERB together with the tur-bine manufacturers has developed the spring support for smaller size turbines.This system was applied for the first time in a nuclear power plant in 1968, to support a 600 MW turbine. Today, spring support is used worldwide for turbines of all capacities up to 1700MW. Many international specifications call for elastically supported foundations.Leading manufacturers of turbines and power plants, using the GERB system, emphasize the following advantages: • Dynamic uncoupling of the turbine foun-dation from the substructure consisting of the supporting beams or columns. • Integration of this substructure into the turbine building. • Better load distribution due to the spring support. • Easy adjustment and realignment in the event of settlement. Adjustments can be carried out even without interrupting theoperation of the machine. • Possibility to monitor the operation of the foundation system and to de-tect settlement using GERB monitoring equipment. • Protection of the turbine from earth-quake damage. • More space below the turbine for the arrangement of condensers and piping. • Significantly lower foundation cost by saving the basemat. Spring elements for elastic sup-port of turbines are manufactured by GERB. High quality coil springs are fitted into rigid steel boxes de-signed to resist prestressing. GERB spring elements are maintenance free and equipped with a high quality corrosion protection system.In order to protect the turbine from earthquakes and to avoid resonance amplified vibration amplitudes Viscodampers ® — also developed by GERB — are supplied.Dampers are either integrated into the spring units or supplied separately. GERB spring units are fastened to the column heads and to the tur- bine table without bolts by adhesive resilient pads. Height adjustment of the table or lateron required height adjustment is done by using steel shims. GERB not only offers spring units and Viscodampers ® but also complete design and full civil engineering of the turbine foundation including earthquake analysis.Installation or supervision of installation is part of GERB supply. Incase of later foundation settlementdue to poor soil conditions GERB mounting engineers can easily readjust the foundation system.
Spring Supported Turbine and Condenser
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Installation and final adjustment of spring elements
Fig. 1, 2 Recesses in the form-work above column heads Fig. 3 Placing of lower adhesive pads Fig. 4 Placing of prestressed spring units Fig. 5 Placing of shims Fig. 6 Covering of the spring units with a steel plate Fig. 7 Spring units after removal of formwork Fig. 8 Leveling of spring units with hydraulic jacks Fig. 9 Spring unit in final position LMZ, Tianwan, China Alstom, Flamanville, France SIEMENS, Niederaussem, Germany BHEL, Bellary, India ABB, Hefei, China Siemens, Olkiluoto 3, Finland
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