Floating docks are typically anchored using 4-roller internal pile guides or single-roller external hoop pile guides – as shown on this sheet. Floatation units, typically ranging in size from 2’x4′ to 5’x5′, are attached to the stringer system with bolts through 2”x8” timber bolting plates. In order to set proper pile heights, embedment depth into supporting soil, and overall pile lengths, the designer must be familiar with local soil conditions, water levels, and tidal actions in the area where the floating dock system is being installed. Consideration of abnormal water levels associated with storm surge is also critical.
William Ralls
Often docks use pilings to hold them in place. However, a permit may be required for the pilings. Instead of pilings, the end of the dock can be anchored in place with two anchors that cross underneath the dock. In this way the anchor lines are out of the way of boats pulling up to the dock. If there is some tidal movement, attaching the anchor with mostly chain instead of rope can minimize drifting.