Thus the bottom part of the guy is vertical and does not obstruct headroom, so a sidewalk can pass between the pole and the guy.Īn alternative to guy-wires sometimes used on dead-end poles is a push-brace pole, a second pole set at an angle in the ground which butts diagonally against the side of the vertical pole.Īntenna mast guy-wires Closeup of anchor end of three guy-wires used to support the KVLY-TV mast in North Dakota, the tallest guyed mast in the world.
In this type the guy line extends diagonally from the top of the pole to a horizontal spar brace extending out from the middle of the pole, and from this it continues vertically to the ground. In urban areas where the ground area around the pole is restricted, a variation called a sidewalk guy is often used. Yellow guy guard on a sidewalk guy, used due to the limited space between the pole and railing to the right The lower end where the cable enters the ground is often encased in a length of yellow plastic reflector to make it more visible, so that people or vehicles do not run into it. To protect the public against faults that might allow the cable to become electrified, utility guy cables usually either have a ceramic strain insulator ("Johnny ball"), or a fiberglass guy strain insulator inserted near the top, to ensure that any dangerous voltages do not reach the lower end of the wire accessible to the public. Guys are particularly needed on dead-end ( anchor) poles, where a long straight section of wire line ends, or angles off in another direction. Utility poles are buried in the ground and have sufficient strength to stand on their own guys are needed on some poles only to support unbalanced lateral loads due to the utility wires attached to them, or to resist ground movement. On a modern sloop-rigged sailboat with a symmetric spinnaker, the spinnaker pole is the spar most commonly controlled by one or more guys.
#A guy wire free
A fore-guy is a term for a line ( rope) attached to and intended to control the free end of a spar. Temporary guys are also used on a sailboat. Multiple guys are usually installed with spreaders to help keep the mast straight ("in column"). Lateral guys attach to "chain plates" port and starboard attached to the hull. Guys are rigged to the bow and stern, usually as a single guy. The guys supporting a sailboat mast are called "standing rigging" and in modern boats are stainless steel wire rope.
Structures with predictable lateral loads, such as electrical utility poles, may require only a single guy-wire to offset the lateral pull of the electrical wires, at a spot where the wires change direction.Ĭonductive guy cables for radio antenna masts may disturb the radiation pattern of the antenna, so their electrical characteristics must be included in the design.įurther information: Guy (sailing) Guy (red arrow), controlling the spinnaker pole. For example, antenna masts are often held up by three guy-wires at 120° angles. As the tower leans a bit due to the wind force, the increased guy tension is resolved into a compression force in the tower or mast and a lateral force that resists the wind load. They are installed radially, usually at equal angles about the structure, in trios and quads. The tension in the diagonal guy-wire, combined with the compression and buckling strength of the structure, allows the structure to withstand lateral loads such as wind or the weight of cantilevered structures. One end of the guy is attached to the structure, and the other is anchored to the ground at some distance from the mast or tower base. Structures that support antennas are frequently of a lattice construction and are called " towers". A thin vertical mast supported by guy wires is called a guyed mast. They are used commonly for ship masts, radio masts, wind turbines, utility poles, and tents. JSTOR ( September 2014) ( Learn how and when to remove this template message)Ī yacht's mast is supported by shrouds and stays - nautical equivalents of guy wires.Ī guy-wire, guy-line, guy-rope, down guy, or stay, also called simply a guy, is a tensioned cable designed to add stability to a free-standing structure.Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources.
This article needs additional citations for verification.
0 kommentar(er)
