ICC Commercial Building Inspector Practice Test

What is the outside diameter limit for grouted in place deep foundation micropiles?

1. 10 inches or less

2. 12 inches or less

3. 14 inches or less

4. 16 inches or less

The correct answer is: 12 inches or less

The outside diameter limit for grouted in place deep foundation micropiles is established to ensure that the micropiles can achieve their design objective while maintaining structural integrity and performance. A limit of 12 inches or less is specified as this size allows for effective load transfer capabilities, minimizing the risk of structural failure due to excessive loading or ground movement. This diameter also aligns with common engineering practices that aim to balance the need for sufficient load-bearing capacity and the practicalities of installation equipment and techniques. Larger diameters could introduce complications related to the placement of concrete, grouting processes, and potential issues with surrounding soil displacement. Understanding these parameters helps structural engineers and inspectors ensure that micropiles are designed and installed according to recognized standards, which is critical for the stability and safety of the structures reliant on these foundation systems.