The prominence of bollards has dramatically increased in the past decade due to heightened concerns about security. They are a simple, practical, and cost-effective means of erecting anti-ram perimeter defense without creating a visual feeling of a fortified bunker. Bollards are popular for traffic direction and control, and in purely decorative applications. However, bollards can serve many functions beyond security. They can be used purely artistic 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 levels of access restriction for many different 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 the building exteriors and surrounding areas. Bollards can incorporate other functions including lighting, security cameras, bicycle parking as well as seating. Decorative bollards are produced in a number of patterns to harmonize with a wide range of architectural styles. The prevalence of the most common type of security bollard, the concrete-filled steel pipe, has encouraged the manufacturing of decorative bollards designed to fit as covers over standard steel pipe sizes, adding pleasing form for the required function.
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 used today. An average marine bollard is produced 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 term bollard also describes a variety of structures used on streets, around buildings, and in landscaping. In accordance with legend, the initial street bollards were actually cannons – sometimes said to be captured enemy weapons – planted in the earth as boundary posts and town markers. If the flow of former cannons was applied up, similarly shaped iron castings were made to match the same functions. Bollards have since become many varieties which are widely employed on roads, especially in urban areas, in addition to outside supermarkets, restaurants, hotels, shops, government buildings and stadiums.
The most common kind of bollard is fixed. The easiest is surely an unaesthetic steel post, about 914 to 1219 mm (36 to 48 in.) above-grade. Specially manufactured bollards include not just simple posts, but also numerous decorative designs. Some feature square or rectangular cross-sections, but a majority of are cylindrical, sometimes using a domed, angled, or flat cap. They are offered in a number of metallic, painted, and sturdy powder coat finishes.
Removable bollards are employed where the necessity to limit access or direct traffic changes occasionally. Both retractable and fold-down styles are employed where selective entry is frequently needed, and they are designed therefore the bollard can easily be collapsed to ground level and quickly re-erected. Both retractable units might be manually operated or automated with hydraulic movements. Movable bollards are large, heavy objects – frequently stone or concrete – that depend on their weight rather than structural anchoring to remain in place. They are created to be moved rarely, then just with heavy machinery for instance a fork-lift.
Bollards generally fall under three types of applications:
Decorative Bollards – decorative bollards for architectural and/or landscaping highlights;
Traffic and Safety Bollards – bollards which provide 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 can border, divide, or define a place. They can be accents, sentries, or supporting players to larger, more dramatic architectural gesture.
Decorative bollards are produced to harmonize with both traditional and contemporary architectural styles. The second lean toward visual simplicity – often straight-sided posts with a number of reveals near the top. Styles created to match various historic periods usually have more elaborate shapes and surface details. Such as 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 feature a simple rounded or slanted top to deter passersby from leaving trash or making use of them for impromptu seating. On the contrary, these 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 frequently made of iron or aluminum casting. Aluminum bollards are desirable for applications where weight is a concern, like a removable bollard. Aluminum units are generally slightly more expensive than iron. For applications in which a decorative bollard might be susceptible to destructive impact, ductile iron is really a safer choice than more brittle metals, as force will deform the metal rather than 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 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 will machine 100% in the surface after casting to create units with a uniform surface for max looks.
Finish is a crucial consideration in a decorative bollard, from functional along with aesthetic standpoints. Bollards are, by their nature, prone to being scratched or nicked by pedestrians and vehicles. Those located near roadways are in contact with a relatively aggressive environment; petrochemical residues and splashes of diluted road de-icing salts may compromise wygcgg painted finishes. Factory-applied powder coating – which is available on iron, aluminum, and steel – is definitely an especially durable form of painted finish. The application form process builds a coating with very consistent coverage. During coating, any bare metal tends 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 made from aluminum might be a better option than iron. When the finish coat is damaged, aluminum oxidizes to some color which is generally more acceptable compared to red rust created by iron. Aluminum and stainless can also be found in a quantity of bare metal finishes. Functionality can be put into the otherwise decorative bollard. As an example, common option is the chain eye – linking two or more bollards with chain, developing a simple traffic direction system. A sizable metal loop or arm on the side of the post allows parking and locking of bicycles, an increasingly popular choice as increasing numbers of people seek alternative green transportation. Bollards could also contain lighting units or security devices, such as motion sensors or cameras.