Spin-Lock Mechanical Rock Anchor Systems

Williams Spin-Lock anchors were first used in the 1950's for rock/roof bolting in projects such as NORAD and Australia's Snowy Mountain power facility. Since then many engineers, contractors and owners have seen the advantages of the Spin-Locks on dams, locks, water/waste treatment facilities and many other large scale civil projects. Williams Spin-Lock anchors provide the advantage of immediate anchorage for pre-stressing and require shorter embedments than traditional grout bond anchor systems.

The Spin-Lock has been job-proven, time and time again to meet all bolting requirements in any strata which can be bolted.

To comply with the need for bolts which will satisfactorily anchor a broad range of variable rock formations, Williams has developed a complete family of rock bolts with a simple and efficient system of installation. Williams offers a complete line of rental equipment for installing, testing and grouting of Spin-Lock anchors.

Before proceeding with your next project, consult with a design agency familiar with Williams Rock Bolting. Williams would be pleased to recommend an ideal system for you.

Williams Spin-Lock Anchor		Serrated Anchor by others
	Expansion shell receives full bearing support from solid 300° cone design.		Quartered cone design leaves expansion shell unsupported at adjacent gaps. Shell can collapse in under high stress.

Method A Anchor is pre-stressed to rock and used in thin slab locations. Method B Less expensive method. Used where pre-stressed rock is anchored to large slabs or footings. Method C Exposed nut and plate where slab is pre-stressed to rock. Method D Non-exposed nut and plate where pre-stressed slab is required to have flush anchor.