To
have a perfect and reliant designs and constructions of machine foundation one
has to fulfill certain specific criteria listed as follows:
1. Similar to
ordinary/regular type foundation, the machine foundation have to be safe and
secure against the shear failure resulted from superimposed loads and also
the settlement should remain within the safer limits. The soli pressure
strictly should not cross the permissible pressure for static loading.
2. The possibility
of resonance shall not be tolerated or encountered. The natural frequency of
foundation needs to be either more than or lesser than the operating/working
frequency of the machine.
3. The amplitudes
under service condition have to remain within the allowable limits for the
machine.
4. The
combination/summation of centre of gravity of the machine and the foundation
should remain on the vertical line passing through the center of gravity of
the base plane.
5. The machine
foundation has to be laid lower than the level of the foundation of adjacent
building and have to be separated properly.
6. The vibrations
occurred or produced strictly should not annoy/trouble or distract to the
persons nearby not detrimental to other objects/structures nearby. For this
one can use the Richarts charts, which was developed during 1962 to
determine the design limits of vertical vibrations. It is used as guideline
to determine the numerous limits of frequency and amplitudes.
7. The presence of
ground-water table has to be at minimum of one-fourth of the foundation
width below the base plane.