The prominence of bollards has dramatically increased during the past decade as a result of heightened concerns about security. They are a simple, practical, and cost-effective way of erecting anti-ram perimeter defense without developing a visual sense of a fortified bunker. Bollards are commonly used for traffic direction and control, and in purely decorative applications. However, bollards can serve many functions beyond security. They can be used purely aesthetic purposes, functioning as landscaping elements. Bollards can create visible boundaries of a property, or separate areas within sites. They can control traffic and they are often arranged to permit pedestrian access while preventing entry of vehicles.
Removable and retractable bollards can allow different amounts of access restriction for a number of circumstances. They frequently tell us where we are able to and cannot drive, park, bike, or walk, protect us from crime, shield vehicles and property from accidents, and add aesthetic features to our building exteriors and surrounding areas. Bollards can incorporate other functions like lighting, surveillance cameras, bicycle parking or even seating. Decorative bollards are created in a variety of patterns to harmonize with an array of architectural styles. The prevalence of the very common type of security bollard, the concrete-filled steel pipe, has encouraged the manufacturing of decorative bollards made to fit as covers over standard steel pipe sizes, adding pleasing form for the required function.
Exactly What Is A Bollard?
A bollard is really a short vertical post. Early bollards were for mooring large ships at dock, and they are generally still in use today. An average marine bollard is manufactured in cast iron or steel and shaped somewhat like a mushroom; the enlarged top was created to prevent mooring ropes from slipping off.
Today, the phrase bollard also describes many different structures applied to streets, around buildings, and then in landscaping. According to legend, the first street bollards were actually cannons – sometimes reported to be captured enemy weapons – planted in the earth as boundary posts and town markers. If the availability of former cannons was used up, similarly shaped iron castings were made to match the same functions. Bollards have since become many varieties which can be widely employed on roads, especially in urban areas, as well as outside supermarkets, restaurants, hotels, shops, government buildings and stadiums.
The most common kind of bollard is fixed. The most basic is surely an unaesthetic steel post, about 914 to 1219 mm (36 to 48 in.) above-grade. Specially manufactured bollards include not only simple posts, but in addition a multitude of decorative designs. Some feature square or rectangular cross-sections, but many are cylindrical, sometimes with a domed, angled, or flat cap. They are available in a variety of metallic, painted, and sturdy powder coat finishes.
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Removable bollards are employed where the requirement to limit access or direct traffic changes occasionally. Both retractable and fold-down styles are employed where selective entry is often needed, and therefore are designed therefore the bollard can easily be collapsed to ground level and quickly re-erected. Both retractable units could be manually operated or automated with hydraulic movements. Movable bollards are large, heavy objects – frequently stone or concrete – that depend on their weight as opposed to structural anchoring to remain in place. They are designed to be moved rarely, then simply with heavy machinery for instance a fork-lift.
Bollards generally fall under three varieties of applications:
Decorative Bollards – decorative bollards for architectural and landscaping highlights;
Traffic and Safety Bollards – bollards that offer asset and pedestrian safety, as well as traffic direction; and
Security Bollards and Post Covers – decorative, impact-resistant bollard enhancements
Some bollards are intended purely to become an ornament. As standalone architectural or landscaping features, they could border, divide, or define a place. They can be accents, sentries, or supporting players to larger, more dramatic architectural gesture.
Decorative bollards are manufactured to harmonize with both traditional and contemporary architectural styles. The latter lean toward visual simplicity – often straight-sided posts with one or more reveals near the top. Styles created to match various historic periods normally have more elaborate shapes and surface details. These include flutes, bands, scrolls as well as other ornamentation.The post-top is really a distinctive feature; traditional bollard design often includes elaborate decorative finials, whereas contemporary versions frequently include a simple rounded or slanted top to deter passersby from leaving trash or making use of them for impromptu seating. On the other hand, they are sometimes made flat and broad specifically to encourage seating. Common decorative bollard materials include iron, aluminum, stainless-steel, and concrete.
Ornamental designs with elaborate detail are often manufactured from iron or aluminum casting. Aluminum bollards are desirable for applications where weight is an issue, like a removable bollard. Aluminum units are usually a little more expensive than iron. For applications in which a decorative bollard could be subjected to destructive impact, ductile iron is a safer choice than more brittle metals, as force will deform the metal instead of shatter and transforming it into possible hazardous flying projectiles.
Iron and aluminum bollards are usually manufactured by sand-casting – a regular foundry technique that is certainly economical and well-fitted to objects this size. However, sand-cast objects frequently bear surface irregularities that often leave the finished product less popular with the attention. If high-finish consistency is desired, seek a manufacturer that can machine 100% of the surface after casting to generate units with a uniform surface for maximum appearance.
Finish is a vital consideration in a decorative bollard, from functional along with aesthetic standpoints. Bollards are, by their nature, vulnerable to being scratched or nicked by pedestrians and vehicles. Those located near roadways are subjected to a reasonably aggressive environment; petrochemical residues and splashes of diluted road de-icing salts may compromise wygcgg painted finishes. Factory-applied powder coating – that is available on iron, aluminum, and steel – is definitely an especially durable type of painted finish. The application process builds a coating with very consistent coverage. During coating, any bare metal is likely to attract the powder, eliminating pinholes in coverage. The baking method that completes the finish gives it additional toughness and abuse resistance.
In applications where greater physical abuse is predictable, decorative bollards manufactured from aluminum can be a better option than iron. If the finish coat is damaged, aluminum oxidizes to some color which is generally more acceptable compared to red rust produced by iron. Aluminum and stainless are also offered in a number of bare metal finishes. Functionality could be included in the otherwise decorative bollard. As an example, common choice is the chain eye – linking two or more bollards with chain, creating a simple traffic direction system. A large metal loop or arm on the side in the post allows parking and locking of bicycles, a progressively popular choice as increasing numbers of people seek alternative green transportation. Bollards might also contain lighting units or security devices, like motion sensors or cameras.