Scope
An engineering assessment and repair design to resolve anchor failure on a wall-mounted jib crane caused by horizontal tensile forces. The goal is to restore structural integrity and ensure safe crane operation under design loads.
Design
A structural assessment was conducted to determine tension forces exerted on the anchorage system.
Conservative design assumptions were applied:
- Only 2 out of 4 anchors considered effective
- Factor of Safety (FOS) = 2 applied to load calculations
This resulted in a required design capacity of approximately 10,400 lbf tensile resistance per anchor.
To ensure reliability and constructability, the following design modifications were specified:
- Installation of new anchors below the existing location
- Lowering of the tie rod bracket
- Avoidance of complications associated with removing existing failed anchors
Installation
The design utilizes a certified adhesive anchoring system: Hilti HIT-HY 200 adhesive system
These materials provide approximately 15,000 lbf pullout capacity per anchor
Factor of Safety ≥ 4, accounting for uneven load distribution
