The popularity of bollards has dramatically increased in the past decade due to heightened concerns about security. They are a basic, practical, and cost-effective way of erecting anti-ram perimeter defense without developing a visual sense 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 as purely aesthetic purposes, functioning as landscaping elements. Bollards can create visible boundaries of the property, or separate areas within sites. They can control traffic and therefore are often arranged to allow pedestrian access while keeping entry of vehicles.
Removable and retractable bollards can allow different amounts of access restriction for a number of circumstances. They frequently inform us where we can 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 including lighting, security cameras, bicycle parking or even seating. Decorative bollards are created in a number of patterns to harmonize with a variety of architectural styles. The prevalence of the very common form of removable security bollards, 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, plus they are still in use today. An average marine bollard is created in cast iron or steel and shaped somewhat such as a mushroom; the enlarged top is made to prevent mooring ropes from slipping off.
Today, the term bollard also describes a variety of structures utilized on streets, around buildings, and in landscaping. In accordance with legend, the first street bollards were actually cannons – sometimes reported to be captured enemy weapons – planted in the ground as boundary posts and town markers. When the supply of former cannons was used up, similarly shaped iron castings were made to fulfill the same functions. Bollards have since evolved into 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 type of bollard is fixed. The simplest is 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 most are cylindrical, sometimes using a domed, angled, or flat cap. They are offered in a selection of metallic, painted, and sturdy powder coat finishes.
Removable bollards are utilized where the need 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 and so 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 rely on how much they weigh rather than structural anchoring to stay in place. They are designed to be moved rarely, and after that just with heavy machinery such as a fork-lift.
Bollards generally fall under three varieties of applications:
Decorative Bollards – decorative bollards for architectural or landscaping highlights;
Traffic and Safety Bollards – bollards that 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 space. They can also 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 will often have more elaborate shapes and surface details. Such as flutes, bands, scrolls as well as other ornamentation.The post-top is 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, they are sometimes made flat and broad specifically to encourage seating. Common decorative bollard materials include iron, aluminum, stainless, and concrete.
Ornamental designs with elaborate detail are often made of iron or aluminum casting. Aluminum bollards are desirable for applications where weight is an issue, like a removable bollard. Aluminum units are usually slightly more expensive than iron. For applications when a decorative bollard may 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 often manufactured by sand-casting – a traditional foundry technique which is economical and well-fitted to objects this size. However, sand-cast objects frequently bear surface irregularities that tend to leave the finished product less attractive to the attention. If high-finish consistency is desired, seek a manufacturer which will machine 100% in the surface after casting to generate units with a uniform surface for max appearance.
Finish is a vital consideration in a decorative bollard, from functional as well as aesthetic standpoints. Bollards are, by their nature, susceptible to being scratched or nicked by pedestrians and vehicles. Those located near roadways are exposed to a reasonably aggressive environment; petrochemical residues and splashes of diluted road de-icing salts may compromise zuhjvq painted finishes. Factory-applied powder coating – which can be available on iron, aluminum, and steel – is definitely an especially durable form of painted finish. The applying process builds up a coating with very consistent coverage. During coating, any bare metal has a tendency to attract the powder, eliminating pinholes in coverage. The baking method that completes the conclusion gives it additional toughness and abuse resistance.
In applications where greater physical abuse is predictable, decorative bollards manufactured from aluminum might be a better choice than iron. If the finish coat is damaged, aluminum oxidizes to your color which is generally more acceptable compared to the red rust made by iron. Aluminum and stainless-steel are also available in a variety of bare metal finishes. Functionality may be included in the otherwise decorative bollard. As an example, common option is the chain eye – linking several bollards with chain, creating a simple traffic direction system. A big metal loop or arm on the side of the post allows parking and locking of bicycles, a progressively popular choice as increasing numbers of people seek alternative green transportation. Bollards may also contain lighting units or security devices, like motion sensors or cameras.