grouting underneath steelwork and steel baseplates
using cementitious or resin grouts to fill gaps below baseplates and steelwork
Step 0 - Shims used to temporarily level baseplate & steelwork
Step 1 - create a formwork around the baseplate
This can be done using timber with a sand haunching to keep it in place while the non-shrink grout is poured. Leave space around the perimeter, so the grout can be seen emerging from the opposite side and rise to the level required.
step 2 - use a hopper and pour in the grout
Pour the non-shrink grout into a hopper. Do not move the hopper and pour from any other location, because this can lead to air-pockets forming beneath the plate, meaning the loading from the steel will not be transferred evenly to the structure beneath. A hopper is especially useful if the baseplate is large and the non-shrink grout has to flow a long distance. It builds a head of pressure that forces the grout beneath the plate at an even rate.
Alternative Step 2 - pour the grout directly from the mixing vessel
When pouring the non-shrink grout directly from the mixing vessel it is important to pour from one point only. Moving position while pouring can lead to air pockets forming beneath the baseplate. This means that load will not be transferred evenly through to the structure below.
Step 3 - Wait for non-shrink grout to go off then remove formwork
Once the non-shrink grout has gone off enough, remove the formwork.
step 4 - chamfer off corners on exposed edges
Before the grout has gone off completely cut back the exposed corners to create a neat chamfer.