Sleeved Holding Down Bolts

One of the greatest problems faced by a steel erector on site is inaccuracy in the locations of the anchor bolts. Precision surveying equipment and techniques are required to accurately set out solidly cast-in anchor bolts in accordance with NZS 3404.1. The required setting out tolerances of these fixed holding down bolts is very tight. To provide increased tolerance and some allowance for site adjustment, sleeved anchor bolts can be used. See Figure 1. These allow some adjustment of bolt positioning after concreting. This article describes the requirements for holding down bolts sleeves.

ERC1004.pdf

Kevin Cowie