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A high velocity tool propels or discharges a stud, pin, or fastener in excess of 300 ft/s (91 m/s). [ 1 ] High-velocity tools made or sold in the United States must comply under certain circumstances; [ 2 ] with many being used in the shipbuilding and steel industries.
Helical anchors consist of an extendable steel shaft with helical bearing plates. Piles or piers refer to strong base elements that withstand or transfer vertical/horizontal loads. Anchors are piles utilised only in tension applications like restraining wall tiebacks or vertical ground anchors made to resist overturning forces.
Anchors are sometimes fitted with a trip line [13] attached to the crown, by which they can be unhooked from underwater hazards. The term aweigh describes an anchor when it is hanging on the rope and not resting on the bottom. This is linked to the term to weigh anchor, meaning to lift the anchor from the sea bed, allowing the ship or boat to move.
Sheet metal screws make excellent fasteners for attaching metal hardware to wood because the fully threaded shank provides good retention in wood. Twinfast screw A Twinfast screw is a type of screw with two threads (i.e. a twin-start screw ), so that it can be driven twice as fast as a normal (i.e. single-start) screw with the same pitch. [ 4 ]
The anchor selection, together with additional reinforcement, and rigging arrangements is influenced by: - The dead weight of the element - The number of anchors in the element and the configuration of the anchor - Capacity of the anchor at the specific concrete compressive strengths at time of lift - The dynamic loads applied during lifting ...
Rail anchors, also called anticreepers, are spring steel clips that attach to the underside of the rail baseplate and bear against the sides of the sleepers to prevent longitudinal movement of the rail, either from changes in temperature or through vibration. Anchors may be attached and removed either by hand with hammers, or by an anchor machine.