The importance of bollards has dramatically increased in the past decade due to heightened concerns about security. They are a simple, practical, and cost-effective way of erecting anti-ram perimeter defense without making 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 for 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 amounts of access restriction for a variety 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 such as lighting, surveillance cameras, bicycle parking or perhaps seating. Decorative bollards are produced in a selection of patterns to harmonize with an array of architectural styles. The prevalence of the very most common kind 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 towards the required function.
Exactly What Is A Bollard?
A bollard is a short vertical post. Early bollards were for mooring large ships at dock, and they are still in use today. A typical marine bollard is created in cast iron or steel and shaped somewhat just like a mushroom; the enlarged top is designed to prevent mooring ropes from slipping off.
Today, the phrase bollard also describes many different structures applied to streets, around buildings, and in landscaping. In accordance with legend, the very first street bollards were actually cannons – sometimes reported to be captured enemy weapons – planted in the ground as boundary posts and town markers. Once the supply of former cannons was used up, similarly shaped iron castings were created to fulfill the same functions. Bollards have since become many varieties which can be widely employed on roads, especially in urban areas, in addition to outside supermarkets, restaurants, hotels, shops, government buildings and stadiums.
The most typical kind of bollard is fixed. The most basic is definitely an unaesthetic steel post, about 914 to 1219 mm (36 to 48 in.) above-grade. Specially manufactured bollards include not only simple posts, but additionally a wide variety of decorative designs. Some feature square or rectangular cross-sections, but most are cylindrical, sometimes having a domed, angled, or flat cap. They come in a variety of metallic, painted, and durable 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 therefore are designed therefore the bollard can be easily 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 rely on their weight as opposed to structural anchoring to remain in place. They are designed to be moved rarely, and then just with heavy machinery like a fork-lift.
Bollards generally fall under three types of applications:
Decorative Bollards – decorative bollards for architectural or landscaping highlights;
Traffic and Safety Bollards – bollards which provide asset and pedestrian safety, in addition to traffic direction; and
Security Bollards and Post Covers – decorative, impact-resistant bollard enhancements
Some bollards are intended purely to be an ornament. As standalone architectural or landscaping features, they are able to border, divide, or define a place. 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 second lean toward visual simplicity – often straight-sided posts with a number of reveals nearby the top. Styles made 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 actually 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 utilizing them for impromptu seating. On the contrary, they may be 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 usually made of iron or aluminum casting. Aluminum bollards are desirable for applications where weight is an issue, for instance a removable bollard. Aluminum units are usually a little more expensive than iron. For applications where a decorative bollard could be subjected to destructive impact, ductile iron is really a safer choice than more brittle metals, as force will deform the metal as opposed to shatter and transforming it into possible hazardous flying projectiles.
Iron and aluminum bollards are frequently manufactured by sand-casting – a regular foundry technique that is certainly economical and well-suited to objects this size. However, sand-cast objects frequently bear surface irregularities that have a tendency to leave the finished product less appealing to the eye. If high-finish consistency is desired, seek a manufacturer that will machine 100% in the surface after casting to produce units using a uniform surface for maximum looks.
Finish is a vital consideration in a decorative bollard, from functional in addition to 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 fairly aggressive environment; petrochemical residues and splashes of diluted road de-icing salts may compromise wygcgg painted finishes. Factory-applied powder coating – that is seen on iron, aluminum, and steel – is surely an especially durable kind 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 procedure that completes the conclusion gives it additional toughness and abuse resistance.
In applications where greater physical abuse is predictable, decorative bollards made of aluminum might be a better option than iron. If the finish coat is damaged, aluminum oxidizes to your color that is generally more acceptable than the red rust made by iron. Aluminum and stainless steel are also available in a variety of bare metal finishes. Functionality could be added to the otherwise decorative bollard. For 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 in 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, such as motion sensors or cameras.