Machine Base Plate Grouting
Expert Solutions to Strengthen Structures and Improve SafetyThe primary purpose of grout under machine baseplates is to reduce vibration, maintain alignment, support load, and provide structural integrity with the foundation for as long as the machine is operable. Selecting the right grout material and using the correct placement technique is critical to machine alignment, integrity, and longevity.
Types of Machine Base Plate Grouting
Understanding the type of compressive load, uplift, shear, and vibration between the machine and its foundation will determine the type of grout needed under a machines baseplate based upon performance characteristics. Cementitious non-shrink and epoxy resin grouts are the most commonly used baseplate grouts, followed by high chemical resistant and high-temperature grouts. Large, heavy rotating machinery on skid mounted baseplate may require epoxy grouts with high compressive strength, impact and uplift properties compared to a general purpose cementitious grout with lesser properties. Conditions with chemical contamination or spills around the baseplate foundation will require chemical resistant grout. Grouting machinery such as gas turbines which produce internal heat distributed through the foundation may require high strength and high-temperature grout characteristics.
Machine Base Plate Grouting Procedure
Anchor bolts must be grouted in before filling the gap between the foundation and machine baseplate. Proper surface preparation achieving a minimum ¼” amplitude surface profile by chipping or aggressive abrasive grit blasting and removing any primer or coating from the base plate prior to the installation of baseplate grout ensures a mechanical bond. Proper mixing, temperature or pot life of the grout during installation is essential for all grout placement. The grout is installed with chamfered edges to promote runoff and reduce edge damage.
Some additional considerations for every application:
- Ideally depth of grout is two inches, with grout full bearing to the plate without voids.
- Viscosity, flow rate and initial set time of grout at 77F is crucial for proper placement.
- Use strong, leakproof forms set level to top of baseplate, minimum 1” out from the perimeter.
- Allow multiple air vents so the grout will not trap air under the baseplate.
- Do not fill the grout above the bottom of the base plate
- 42 11 00 Process Boiler Foundation Repair
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