The prominence of bollards has dramatically increased during the past decade as a result of heightened concerns about security. They are an easy, practical, and cost-effective method of erecting anti-ram perimeter defense without developing a visual sense of a fortified bunker. Bollards are widely used 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, working as landscaping elements. Bollards can make 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 created in a number of patterns to harmonize with a variety of architectural styles. The prevalence of the most common type of buy steel bollards, 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 to the required function.
What Exactly Is A Bollard?
A bollard is really a short vertical post. Early bollards were for mooring large ships at dock, plus they are still used today. A typical marine bollard is produced in cast iron or steel and shaped somewhat such as a mushroom; the enlarged top is designed to prevent mooring ropes from slipping off.
Today, the word bollard also describes a variety of structures utilized on streets, around buildings, and in landscaping. In accordance with legend, the very first street bollards were actually cannons – sometimes said to be captured enemy weapons – planted in the earth as boundary posts and town markers. Once the flow of former cannons was used up, similarly shaped iron castings were created to fulfill the same functions. Bollards have since evolved into many varieties that are widely employed on roads, specifically in urban areas, along with outside supermarkets, restaurants, hotels, shops, government buildings and stadiums.
The most frequent form 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 only simple posts, but also numerous decorative designs. Some feature square or rectangular cross-sections, but many are cylindrical, sometimes using a domed, angled, or flat cap. They are offered in a selection of metallic, painted, and durable powder coat finishes.
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 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 rely on how much they weigh as opposed to 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 belong to three varieties of applications:
Decorative Bollards – decorative bollards for architectural and landscaping highlights;
Traffic and Safety Bollards – bollards which provide asset and pedestrian safety, along with 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 are able to border, divide, or define a place. They may also be accents, sentries, or supporting players to larger, more dramatic architectural gesture.
Decorative bollards are made to harmonize with both traditional and contemporary architectural styles. The second lean toward visual simplicity – often straight-sided posts with several reveals nearby the top. Styles created to match various historic periods will often 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 come with a simple rounded or slanted top to discourage passersby from leaving trash or using them for impromptu seating. On the other hand, 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 usually made from iron or aluminum casting. Aluminum bollards are desirable for applications where weight is a concern, like a removable bollard. Aluminum units tend to be slightly more expensive than iron. For applications where a decorative bollard may be subject to destructive impact, ductile iron is actually 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 frequently manufactured by sand-casting – a conventional 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 popular with the attention. If high-finish consistency is desired, seek a manufacturer that can machine 100% from the surface after casting to generate units having a uniform surface for max appearance.
Finish is an important consideration in a decorative bollard, from functional in addition to aesthetic standpoints. Bollards are, by their nature, prone 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 zuhjvq painted finishes. Factory-applied powder coating – which can be seen on iron, aluminum, and steel – is definitely an especially durable form of painted finish. The applying process builds a coating with very consistent coverage. During coating, any bare metal has a tendency to attract the powder, eliminating pinholes in coverage. The baking process that completes the finish gives it additional toughness and abuse resistance.
In applications where greater physical abuse is predictable, decorative bollards manufactured from aluminum might be a better option than iron. In the event the finish coat is damaged, aluminum oxidizes to some color which is generally more acceptable compared to the red rust created by iron. Aluminum and stainless steel can also be found in a number of bare metal finishes. Functionality can be added to the otherwise decorative bollard. For example, common choice is the chain eye – linking several bollards with chain, making a simple traffic direction system. A large metal loop or arm on the side of the post allows parking and locking of bicycles, an extremely popular choice as more people seek alternative green transportation. Bollards may also contain lighting units or security devices, like motion sensors or cameras.