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Fence
A fence is a structure that encloses an area, typically outdoors, and is usually constructed from posts that are connected by boards, wire, rails or net (textile), netting. A fence differs from a wall in not having a solid foundation along its whole length. Alternatives to fencing include a ditch (fortification), ditch (sometimes filled with water, forming a moat). Types By function * Agricultural fencing, to keep livestock in and/or predators out * Blast fence, a safety device that redirects the high energy exhaust from a jet engine * Sound barrier or acoustic fencing, to reduce noise pollution * Crowd control barrier * Privacy fencing, to provide privacy and security * Temporary fencing, to provide safety, security, and to direct movement; wherever temporary access control is required, especially on building and construction sites * Perimeter fencing, to prevent trespassing or theft and/or to keep children and pets from wandering away. * Decorative fencing, to enhan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agricultural Fencing
In agriculture, fences are used to keep animals in or out of an area. They can be made from a wide variety of materials, depending on terrain, location and animals to be confined. Most agricultural fencing averages about high, and in some places, the height and construction of fences designed to hold livestock is mandated by law. A is the strip of land by a fence that is left uncultivated. It may be a hedgerow or a shelterbelt (windbreak) or a refugee for native plants. If not too narrow, it acts as a habitat corridor. History Historically throughout most of the world, domestication, domesticated livestock would roam freely and were fenced out of areas, such as gardens or fields of crops, where they were unwanted. Over time, especially where crop agriculture became dominant and population density of both humans and animals was significant, livestock owners were made to fence their animals in. The earliest fences were made of available materials, usually Rock (geology), stone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Snow Fence
A snow fence, similar to a sand fence, is a barrier that forces windblown, drifting snow to accumulate in a desired place. Snow fences are employed primarily to minimize the amount of snowdrift on roadways and railways. Farmers and ranchers use snow fences to create drifts in basins for a ready spring water supply. Ski resorts also use snow fences to increase snow depth in specified areas, or for avalanche control. Description and physical mechanism Temporary snow fences are usually one of two varieties: perforated orange plastic sheeting attached to stakes at regular intervals (the type usually used for construction site fencing or temporary sports field fencing) or a cedar or other lightweight wood strip and wire fence, also attached to metal stakes. A permanent snow fence usually consists of poles with horizontal planks running across them to cover just over one-half of the total fence area. Taller fences trap more snow. Taking the height of the fence as one unit, it sh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pest-exclusion Fence
280px, Xcluder pest-exclusion fence around the perimeter of Sanctuary Mountain Maungatautari in New Zealand A pest-exclusion fence is a barrier that is built to exclude certain types of animal pests from an enclosure. This may be to protect plants in horticulture, preserve grassland for grazing animals, separate species carrying diseases ( vector species) from livestock, prevent troublesome species entering roadways, or to protect endemic species in nature reserves. These fences are not necessarily traditional wire barriers, but may also include barriers of sound, or smell. Design techniques Animals can be excluded by a fence's height, depth under the ground and mesh size. It is also important to choose a construction material that cannot be climbed; furthermore, sometimes it is necessary to create a subsurface fencing element to prevent burrowing under the fence. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pet Fence
A pet fence or radio fence, is an electronic system designed to keep a pet or other domestic animal within a set of predefined boundaries without the use of a physical barrier. A mild electric shock is delivered by an electronic collar if its warning sound is ignored. The system was first invented and patented by Richard Peck in 1973. History The pet fence was created in 1973 by Richard Peck. Peck was a traveling salesman and through his travels, he saw enough dogs hit by cars that it led to him creating the pet fence system. In 1976, salesman John Purtell bought the rights to the pet fence and rebranded it as "Invisible Fence" which offered a different option for pet owners in terms of pet containment. In 1990, Invisible Fence Co became Invisible Fence Inc. Technology A typical invisible fence transmits a radio signal that takes the geometric shape of the area that is enclosed by the system. The pet wears a lightweight collar that emits a sensory cue, such as a warning sound, wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pool Fence
A swimming pool fence is a type of fence placed around swimming pools, to create a passive barrier to restrict the access of small children to the swimming pool. Swimming pool fences must have a self-closing and self-latching gate/s to be compliant to most countries' laws and codes. Swimming pool fences are designed so that young children cannot climb over them or go through them. They are manufactured to strict standards to be sturdy, durable and non-climbable. Most countries design, manufacture and install swimming pool fences to the International Code Councils (ICC) guidelines. Types Swimming pool fences are manufactured in several different types, using a variety of materials. * Aluminum fencing, Aluminum * Steel * Glass * Vinyl / PVC fencing * Mesh They can be slotted to allow visibility or solid for privacy. Swimming pool barrier regulations Countries, states and municipalities within countries have different laws regarding swimming pool fencing laws, ranging from no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Newt Fencing
Newt fencing is a barrier designed to control the movement of great crested newts, other amphibians or reptiles. It can also be called drift fencing or temporary amphibian fencing (TAF). It consists of a low fence of plastic sheeting, buried a short way into the ground and supported by lightweight posts, usually made of wood or plastic. It is used to keep animals out of working areas, to keep them in safe areas of their habitat, to intercept migration routes, or to control their movement to facilitate their capture for translocation (wildlife conservation), translocation. It can be used in conjunction with pitfall traps placed at the base of the fence. It is most commonly used in association with building projects to minimise disturbance to protected species. Background Legislation The great crested newt (''Triturus cristatus'') is an amphibian native to the United Kingdom, but is also widespread throughout Northern Europe. While it is relatively common in the UK (in fact the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perimeter Fencing
Demarcation of a perimeter, when the protection of assets, personnel or buildings is required, is normally affected by the building of a perimeter fence system. The level of protection offered varies according to the threat level to the perimeter. Different types of perimeter Fence, fencing include: * Chain-link fencing * Metal railings * Palisade fencing * Rolled mesh fencing * Timber fencing * Welded wire mesh fence fencing Vertical bar fencing has been the most popular form of perimeter security fence since the 1980s. Since the 2000s, welded wire mesh and acoustic barriers have also become popular types of perimeter fence around the world. Vertical bar, acoustic barriers and welded mesh are used in commercial projects and landmarks, and transport hubs. In high-security applications, Perimeter intrusion detection systems, sensors may be attached to the fence that generate alarms when they detect someone cutting, climbing, or lifting the fence fabric. Purpose The purpose ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moat
A moat is a deep, broad ditch dug around a castle, fortification, building, or town, historically to provide it with a preliminary line of defence. Moats can be dry or filled with water. In some places, moats evolved into more extensive water defences, including natural or artificial lakes, dams and sluices. In older fortifications, such as hillforts, they are usually referred to simply as ditches, although the function is similar. In later periods, moats or water defences may be largely ornamental. They could also act as a sewer. Historical use Ancient Some of the earliest evidence of moats has been uncovered around ancient Egyptian fortresses. One example is at Buhen, a settlement excavated in Nubia. Other evidence of ancient moats is found in the ruins of Babylon, and in reliefs from ancient Egypt, Assyria, and other cultures in the region. Evidence of early moats around settlements has been discovered in many archaeological sites throughout Southeast Asia, including ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blast Fence
A jet blast deflector (JBD) or blast fence is a safety device that redirects the high energy exhaust from a jet engine to prevent damage and injury. The structure must be strong enough to withstand heat and high speed air streams as well as dust and debris carried by the turbulent air. Without a deflector, jet blast can be dangerous to people, equipment, vehicles and other aircraft.Morrison, Rowena. ''ASRS Directline'', Issue Number 6, August 1993"Ground Jet Blast Hazard."Retrieved on November 13, 2009. Jet blast deflectors range in complexity from stationary concrete, metal or fiberglass fences to heavy panels that are raised and lowered by hydraulic arms and actively cooled. Blast deflectors can be used as protection from helicopter and fixed-wing aircraft propwash. At airports and jet engine service centers, jet blast deflectors can be combined with sound-deadening walls to form a ground run-up enclosure within which a jet aircraft engine can safely and more quietly be teste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Temporary Fencing
Temporary fencing is a free standing, self-supporting fence panel. The panels are held together with couplers that interlock panels together making it portable and flexible for a wide range of applications. Fence panels are supported with counter-weighted feet, have a wide variety of accessories including gates, handrails, feet and bracing depending on the application. Fence panels are commonly constructed of either chain link or weld mesh. Temporary fencing is an alternative to its permanent counterpart when a fence is required on an interim basis when needed for storage, public safety or security, crowd control, or theft deterrence. It is also known as construction hoarding when used at construction sites. Other uses for temporary fencing include venue division at large events and public restriction on industrial construction sites, when guardrails are often used. Temporary fencing is also often seen at special outdoor events, parking lots, and emergency/disaster relief site ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wall
A wall is a structure and a surface that defines an area; carries a load; provides security, shelter, or soundproofing; or serves a decorative purpose. There are various types of walls, including border barriers between countries, brick walls, defensive walls in fortifications, and retaining walls that hold back dirt, stone, water, or noise. Walls can also be found in buildings, where they support roofs, floors, and ceilings, enclose spaces, and provide shelter and security. The construction of walls can be categorized into framed walls and mass-walls. Framed walls transfer the load to the foundation through posts, columns, or studs and typically consist of structural elements, insulation, and finish elements. Mass-walls are made of solid materials such as masonry, concrete, adobe, or rammed earth. Walls may also house utilities like electrical wiring or plumbing and must conform to local building and fire codes. Walls have historically served defensive purp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ditch (fortification)
In military engineering, a ditch is an obstacle designed to slow down or break up an attacking force, while a Trench warfare, trench is intended to provide cover to the defenders. In military fortifications, the side of a ditch furthest from the enemy and closest to the next line of defence is known as the scarp (fortification), scarp while the side of a ditch closest to the enemy is known as the counterscarp. Uses In early fortifications, ditches were often used in combination with rampart (fortification), ramparts to slow down the enemy whilst defensive fire could be brought to bear from the relative protection afforded by the rampart and possibly the palisade. In medieval fortifications, a ditch was often constructed in front of a defensive wall to hinder Mining (military), mining and escalade activities from an attacker. When filled with water, such a defensive ditch is called a moat. However, moats may also be dry. Star forts designed by military engineers like Vauban, co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
