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243:, usually at equal angles about the structure, in trios and quads. 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. For example, antenna masts are often held up by three guy-wires at 120° angles. 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.
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543:. The anchor must be adequate to resist the maximum tensile load of the guy wires; both the dead load of the tension of the wire and the maximum possible live load due to wind. Since the guy wire exerts its force at an angle, the anchor has both vertical and lateral (horizontal) forces on it. The anchor relies on the lateral shear strength of the soil to resist the forces from all of the guys attached to it. Several types of anchor are used:
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center. Modern forms are the plate anchor, in which the guy is attached to a rod with an eyelet extending from the center of a steel plate buried diagonally, perpendicular to the angle of the guy. In the concrete anchor, a diagonal rod with an eyelet extending in the guy direction is cemented into a hole filled with steel reinforced concrete. A sufficiently massive concrete block on the surface of the ground can also be used as a dead man.
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417:"Johnny ball" insulators (also called "egg insulators") are usually used. Non-conductive guys of Kevlar fiber (Phillystran) or extruded fiberglass rod are frequently used to not disturb the radiation pattern of the antennas. The strength and low stretch properties of Kevlar fiber approaches that of steel. However, Kevlar is very susceptible to ultraviolet degradation, so it is enclosed in a UV resistant plastic sheath.
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331:("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. 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.
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This type consists of a rod with wide screw blades on the end and an eyelet on the other for the guy wire. It is screwed deep into the ground, at the same angle as the guy, by a truck-mounted drill machine. These are commonly used as guy anchors for utility poles since they are quick to install with
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These are used in both soil and rock. A hole is drilled at the angle of the guy. A steel anchor rod with an eye is inserted, and the hole around it is filled with a liquid grout consisting of concrete and an expansion agent or a structural epoxy. When the grout hardens or expands, the anchor is
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In this type, a hole is excavated and an object with a large surface area is placed in it with the guy wire attached, and the hole is backfilled with earth or concrete. In the historical form of dead man anchor, a log is buried horizontally in a trench with the guy attached perpendicularly to its
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of the mast or for feeding the mast with the radiation power. In these cases, the guys are fixed without an insulator on the mast, but there is at least one insulator in the guy if necessary. If guys are used for feeding the mast with high frequency power it is often possible to use a grounded mast.
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AM radio broadcast towers are often fitted with insulators at the mast base and the RF energy is fed at that point. Some are also insulated at the center for feeding the RF energy at that point. Wire rope guys are frequently used and segmented with insulators at several points. Extensive lightning
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is often used. 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. Thus, the bottom part of the guy is vertical and does not obstruct headroom, so a sidewalk
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caused by this static electricity can be several times larger than that generated by the transmitter. In order to avoid dangerous and unpredictable discharges, the insulators must be designed to withstand this high voltage, which on tall masts results in over-dimensioned backstage insulators. At
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The guys supporting a sailboat mast are called "standing rigging" and in modern boats are stainless steel wire rope. Guys are rigged to the bow and stern, usually as a single guy. Lateral guys attach to "chain plates" port and starboard attached to the hull. Multiple guys are usually installed
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Conductive guy cables for radio antenna masts may disturb the radiation pattern of the antenna, so their electrical characteristics must be included in the design. Usually this conductive guy cables that otherwise would consume up some of the radiation power and radiate it in some other direction
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of the antenna. This also applies to guy wires of neighboring masts or metal structures situated nearby. To prevent this, each guy wire is divided by strain insulators into multiple sections, each segment non-resonant at the transmitted wavelength. Cylindrical or egg-shaped
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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. Guys are particularly needed on
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strikes. The insulators and arrestors must be maintained carefully, because an insulator failure can result in a mast collapse. Egg insulators have the porcelain in compression and if it fails, the end loops of the guy wires are still intertwined.
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A rod with a pivoted blade on the end is driven into the earth. When the guy wire is attached and tensioned, its force pulls the blade open, "setting" it into the soil. These are often used by the military for rapid mast installations.
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than intended. To avoid this, the guy wire gets broken up into a couple of isolated sections that can not act as antennas on their own due to length differences and not being resonant at the transmission frequency.
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in North Dakota, the tallest guyed mast in the world. Each guy is one member of a set of three that is located radially around the tower
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408:. Conductive metal guy-wires whose lengths are near to quarter wavelength multiples of the transmitted frequency can distort the
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may be connected to unwieldy payloads, allowing ground crew to control rotation and swaying while maintaining a safe distance.
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605:. There are also many structures which consist of a freestanding bottom and a guyed top. These are either
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Sidewalk guy with yellow guard, used due to the limited space between the pole and railing to the right
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The power to the guys is fed via wires running from a tuning unit to the feed point on the guys.
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with spreaders to help keep the mast straight ("in column"). Temporary guys are also used on a
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In ground-anchored guys, the structure which attaches the guy-wire to the ground is called an
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in the form of an arc gap is required for the purpose of over-voltage protection in case of
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American
Society of Civil Engineers, Subcommittee on Guyed Transmission Structures (1997).
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On antennas for long-wave and VLF, the guys may serve an electrical function, either for
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In urban areas where the ground area around the pole is restricted, a variation called a
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Guys can be used to raise an extension ladder in a technique called a church raise.
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Electromagnetic fields from the antennas complicate the design of guys that support
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designed to add stability to a freestanding structure. They are used commonly for
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The individual sections of conductive guys can develop large charges of
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Tensioned cable designed to add stability to a freestanding structure
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An alternative to guy-wires sometimes used on dead-end poles is a
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to the ground at some distance from the mast or tower base. The
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Concrete dead man anchor for radio tower guy lines in
Britain
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Closeup of anchor end of three guy-wires used to support the
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strength of the structure, allows the structure to withstand
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Seabees using tag lines to steady a load during a crane lift
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is the spar most commonly controlled by one or more guys.
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30:"Guidewire" redirects here. For the software company, see
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are frequently of a lattice construction and are called "
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Historically, guyed structures have been some of the
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of type used on utility pole and antenna mast guys.
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707:Design of Guyed Electrical Transmission Structures
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569:a truck mounted hydraulic powered auger drive.
454:protection is required for insulated towers.
223:in the diagonal guy-wire, combined with the
710:. USA: ASCE Publications. pp. 21–25.
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127:Learn how and when to remove this message
603:tallest man-made structures in the world
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151:- nautical equivalents of guy wires.
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658:Bracing (aeronautics)#Bracing_wires
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283:. A fore-guy is a term for a line (
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61:improve this article
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509:. You can help by
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32:Guidewire Software
597:Dubai Creek Tower
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59:Please help
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743:Guyed masts
225:compression
189:radio masts
732:Categories
717:0784402841
664:References
638:Turnbuckle
595:See also:
484:tag lines,
205:guyed mast
185:ship masts
87:newspapers
76:"Guy-wire"
435:lightning
415:porcelain
301:spinnaker
272:spinnaker
18:Guidewire
684:Archived
653:Gin pole
617:See also
587:secure.
321:dead-end
297:sailboat
295:-rigged
281:sailboat
241:radially
229:buckling
217:anchored
209:antennas
169:down guy
165:guy-rope
161:guy-line
157:guy-wire
648:Ferrule
643:Shackle
633:Tie rod
533:Anchors
426:voltage
256:Sailing
221:tension
145:shrouds
101:scholar
738:Cables
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540:anchor
325:anchor
303:, the
213:towers
199:, and
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480:crane
293:sloop
274:pole.
201:tents
181:cable
171:, or
149:stays
108:JSTOR
94:books
712:ISBN
289:spar
285:rope
251:Uses
227:and
173:stay
147:and
80:news
609:or
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177:guy
63:by
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