Category: Structure & materials
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
Anchor bolts are steel bolts cast into concrete using a template that fixes their positions, or post-installed with chemical anchors, to fix steel columns, equipment and canopies to foundations through the base plate.
Why it matters on a project
Any error in position or level stops the steel frame from being erected and needs costly fixes. Use an accurate template and inspect before the pour.
Measurement and pricing
By number per diameter and length, or within structural steel weight in tonnes, with grout under the base plate by number or cubic metre.
Common mistake
Pouring footings without a template holding the bolts, so they move during the pour and end up off grid.
Frequently asked questions
What are chemical anchors?
Bolts set in drilled holes after the pour and bonded with epoxy, used for additions or to fix mistakes.
Why grout under the base plate?
To fill the gap between plate and concrete with non-shrink grout so load transfers evenly.
Related terms
- Steel structureA structural frame of steel sections connected by welding or bolts, protected from corrosion by coating.
- Steel connectionsHow steel members are joined by bolts or welding.
- Footings (foundations)Structural elements that transfer the building loads to the soil.
- Inspection request (IR)A formal request from the contractor to the consultant to inspect work before the next stage.
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