Machine Foundations

Machines with rotating or oscillating masses frequently require a foundation. It transfers static and dynamic loads to the subsoil, increases the stiffness of the machine parts, or serves as a vibration reduction mass. Turbines and fans are typical examples of machines with rotating masses. Reinforced concrete will be used for most projects either in form of a beam, plate or block foundation, however, in some cases also steel frames can be used.

Machines for forming processes usually cause high levels of impact forces. The vibration isolation of large forging presses can be assured with the help of R/C foundation blocks or steel frames placed on Spring VISCODAMPER® combinations. These foundations are often arranged in a foundation pit which additionally can take other equipment, e.g. necessary for the machine operation. Usually the pit will be covered with a steel construction allowing the space to be used.

One of the GERB specialities is the layout and design of heavy machine tool foundations. Here besides the load transmission function a high level of precision is required for the proper operation of the machine. For this purpose subsoil properties and design guidelines have to be considered very detailed. Modern computer-aided analysis methods make it possible to establish accurately the permissible deformations up to the µm-range. Some special design aspects have to be considered when preparing the engineering documentation.

Fig. Typical Computer Plots of Turbine-Generator Decks (Model and Mode Shape)

Fig. Mode Shape of a Steel Frame for a Motor-Driven Fan

Fig. Analysis Model of a Diesel-Generator Set and Mode Shape

Stress Distribution of a R/C Block for a Counterblow-Hammer