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Bollards are used to protect buildings and people in public spaces from car ramming attacks [21] and accidental collisions. Related protections against deliberate attacks are wedge barriers and archer barriers. [22] The bollards are effective protection against deliberate attacks if properly deployed and maintained.
Bollard pull is a conventional measure of the pulling (or towing) power of a watercraft.It is defined as the force (usually in tonnes-force or kilonewtons (kN)) exerted by a vessel under full power, on a shore-mounted bollard through a tow-line, commonly measured in a practical test (but sometimes simulated) under test conditions that include calm water, no tide, level trim, and sufficient ...
A bollard is a single vertical post useful to receive a spliced loop at the end of a mooring line. [1] A cleat has horizontal horns. [4] References
A dockworker places a mooring line on a bollard. A mooring is any permanent structure to which a seaborne vessel (such as a boat, ship, or amphibious aircraft) may be secured. Examples include quays, wharfs, jetties, piers, anchor buoys, and mooring buoys. A ship is secured to a mooring to forestall free movement of the ship on the water.
A tugboat is typically rated by its engine's power output and its overall bollard pull. The largest commercial harbour tugboats in the 2000s–2010s, used for towing container ships or similar, had around 60 to 65 short tons-force (530–580 kN) of bollard pull, which is described as 15 short tons-force (130 kN) above "normal" tugboats. [5] [6]
HMS Thetis aground Warping or kedging is a method of moving a sailing vessel, typically against the wind or current, after running aground, or out from a dead calm, by hauling on a line attached to a kedge anchor, a sea anchor, or a fixed object, such as a bollard or tree.