The use of 3 to 4 diameters approximately equates to the minimum size of the anchor head to resist a minimum of 70% of pretensioning force in high-strength anchor bolts (ASTM A-193 B7), which are commonly used for heavy machinery.
Typical diameters of large grout pockets are at least 3 to 4 times the anchor bolt diameter + 2⅜ inches. An example of the use of this pocket is with heavy machinery foundations ( Figure 1). Large grout pockets: The pocket size is much larger than the anchor, and pockets are typically pre-formed prior to the concrete placement, or they may be cored after the concrete placement.Large grout pocket construction (Ref: Figure 8.4 from EFRC report, 2017).įrom a size perspective, there are generally two different grout pockets:
