The popularity of bollards has dramatically increased in the past decade because of heightened concerns about security. They are a basic, practical, and cost-effective method of erecting anti-ram perimeter defense without making 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 as purely aesthetic purposes, performing 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 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 our own 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 variety of patterns to harmonize with a variety of architectural styles. The prevalence of the most common type of security bollards, the concrete-filled steel pipe, has encouraged the manufacturing of decorative bollards created to fit as covers over standard steel pipe sizes, adding pleasing form to the required function.
What Exactly Is A Bollard?
A bollard is a short vertical post. Early bollards were for mooring large ships at dock, plus they are still used today. An average marine bollard is created 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 used on streets, around buildings, as well as in landscaping. According to legend, the initial street bollards were actually cannons – sometimes reported to be captured enemy weapons – planted in the earth as boundary posts and town markers. Once the availability of former cannons was applied up, similarly shaped iron castings were made to fulfill the same functions. Bollards have since become many varieties that are widely employed on roads, especially in urban areas, as well as outside supermarkets, restaurants, hotels, shops, government buildings and stadiums.
The most typical 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 only simple posts, but additionally numerous decorative designs. Some feature square or rectangular cross-sections, but most are cylindrical, sometimes having a domed, angled, or flat cap. They are available in a selection of metallic, painted, and durable powder coat finishes.
Removable bollards are utilized where the requirement 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 so the bollard can be simply 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 count on how much they weigh instead of structural anchoring to remain in place. They are designed to be moved rarely, and then simply with heavy machinery such as a fork-lift.
Bollards generally belong to 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 get an ornament. As standalone architectural or landscaping features, they can border, divide, or define an area. They can 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 near the top. Styles made to match various historic periods normally have more elaborate shapes and surface details. Included in this are 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 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, 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 subject 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 traditional foundry technique which is economical and well-suitable for objects this size. However, sand-cast objects frequently bear surface irregularities that have a tendency to leave the finished product less appealing to the attention. If high-finish consistency is desired, seek a manufacturer that can machine 100% of the surface after casting to produce units with a uniform surface for optimum looks.
Finish is a crucial 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 subjected to a relatively aggressive environment; petrochemical residues and splashes of diluted road de-icing salts may compromise zuhjvq painted finishes. Factory-applied powder coating – that is on iron, aluminum, and steel – is surely an especially durable type of painted finish. The application form process increases 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 made of aluminum may be a better option than iron. If the finish coat is damaged, aluminum oxidizes to your color that is certainly generally more acceptable compared to red rust produced by iron. Aluminum and stainless-steel are also offered in a number of bare metal finishes. Functionality can be included in the otherwise decorative bollard. For instance, common choice is the chain eye – linking 2 or more 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 more people seek alternative green transportation. Bollards could also contain lighting units or security devices, like motion sensors or cameras.