How to resolve the problem of low anchor bolt

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How to resolve the problem of low anchor bolt

28 September 2018
 Categories: , Blog


If you've walked the streets of a burgeoning city, you've probably witnessed steel frameworks tower above the cityscape. The structural members form as a lattice. Note that steel erection principles oversee this process, setting up the structure bit by bit until the entire steel framework of the building is fully executed. Even with detailed planning in the design phase, errors may still occur, and as a steel erector, you may be faced with a situation which requires modification or repair. In this regard, anchor rod problems are very common in steel erection. Luckily, this article provides practical solutions to commonly occurring anchor rod problems faced by steel erectors. Read on.

Anchor rod definition

Also known as anchor bolt or just an anchor, this is a steel rod that is grouted into the concrete foundation. In other words, the steel structure is connected to the concrete foundation through the anchor rod. Anchors may be placed into concrete when it's poured or installed after the concrete foundation is set.

Low anchor rods

Sometimes anchors are installed with the tops shorter compared to the base plate. This may result in two outcomes:

  • The rods are positioned so low that the high point of the rod is underneath the zenith of the based plate, so the anchor rod nut cannot be engaged.
  • The top of the anchor rod extends higher than the base plate, but not tall enough to pull off full thread engagement of the nut.

Possible solutions

The solution to anchor bolts that are placed low is to elongate or extend them. Two methods can be used to make the rods longer.

Welded extensions

If the anchor bolt is designed from a material that can be welded, the steel erector can decide to directly weld an extra length of threaded bolt to the fixed bolt on the base plate. Through a double -V- type groove weld, you can prepare the extra piece of threaded bolt. Instead of directly welding the bolts together, you can join the additional piece of threaded rod by means of lap plates. Flare bevel groove welds are normally used to join the lap plates to the anchor rods.

Coupling nut

Alternatively, you can join an added threaded piece to the fixed rod through a coupling nut. Given that the coupling nut has a larger diameter relative to the rods, the steel erector may have to enlarge the base plate holes.

If you notice rods that are set low, you can adopt any of the above-mentioned solutions to resolve the low anchor rod problem prior to starting steel erection.