The prominence of bollards has dramatically increased in the past decade due to heightened worries about security. They are a simple, practical, and cost-effective way of erecting anti-ram perimeter defense without developing a visual sense of a fortified bunker. Bollards are commonly used for traffic direction and control, as well as in purely decorative applications. However, steel bollards for sale can serve many features beyond security. They can be used purely aesthetic purposes, functioning as landscaping elements. Bollards can make visible boundaries of any property, or split areas within sites. They can control traffic and are often organized to permit pedestrian access while preventing entry of vehicles.
Removable and retractable bollards can allow different degrees of access restriction for a number of circumstances. They frequently inform us where we could 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 like 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 security bollard, 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 towards the required function.
What Exactly 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 normal marine bollard is produced in cast iron or steel and shaped somewhat like a mushroom; the enlarged top is designed to prevent mooring ropes from slipping off.
Today, the phrase bollard also describes a variety of structures utilized on streets, around buildings, and then in landscaping. In accordance with legend, the 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 utilized up, similarly shaped iron castings were designed to fulfill the same functions. Bollards have since evolved into many varieties which can be widely employed on roads, particularly in urban areas, in addition to outside supermarkets, restaurants, hotels, shops, government buildings and stadiums.
The most common kind of bollard is fixed. The most basic 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 additionally a multitude of decorative designs. Some feature square or rectangular cross-sections, but many are cylindrical, sometimes having a domed, angled, or flat cap. They are available 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 often 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 how much they weigh instead of structural anchoring in which to stay place. They are made to be moved rarely, then just with heavy machinery for instance a fork-lift.
Bollards generally fall into three types of applications:
Decorative Bollards – decorative bollards for architectural or landscaping highlights;
Traffic and Safety Bollards – bollards that offer 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 be an ornament. As standalone architectural or landscaping features, they could 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 latter lean toward visual simplicity – often straight-sided posts with several reveals close to the top. Styles made to match various historic periods normally have more elaborate shapes and surface details. Included in this are flutes, bands, scrolls along with other ornamentation.The post-top is actually a distinctive feature; traditional bollard design often includes elaborate decorative finials, whereas contemporary versions frequently feature a simple rounded or slanted top to discourage 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, and concrete.
Ornamental designs with elaborate detail are often made of iron or aluminum casting. Aluminum bollards are desirable for applications where weight is a concern, such as a removable bollard. Aluminum units tend to be slightly more expensive than iron. For applications where 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 as opposed to shatter and transforming it into possible hazardous flying projectiles.
Iron and aluminum bollards are often manufactured by sand-casting – a conventional foundry technique that is economical and well-suitable for objects this size. However, sand-cast objects frequently bear surface irregularities that tend to leave the finished product less popular with the attention. If high-finish consistency is desired, seek a manufacturer that will machine 100% of the surface after casting to generate units having a uniform surface for optimum 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 in contact with a fairly aggressive environment; petrochemical residues and splashes of diluted road de-icing salts may compromise some painted finishes. Factory-applied powder coating – that is seen on iron, aluminum, and steel – is definitely an especially durable type 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 method that completes the conclusion gives it additional toughness and abuse resistance.
In applications where greater physical abuse is predictable, plastic bollard covers made from aluminum may be a better choice than iron. If the finish coat is damaged, aluminum oxidizes to your color that is certainly generally more acceptable than the red rust created by iron. Aluminum and stainless steel are also offered in a quantity of bare metal finishes. Functionality can be added to the otherwise decorative bollard. For instance, 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 increasingly popular choice as more people seek alternative green transportation. Bollards could also contain lighting units or security devices, like motion sensors or cameras.
Traffic and Safety Bollards
The most common bollard applications are traffic direction and control, along with safety and security. The initial function is achieved through the visual presence from the bollards, and to some degree by impact resistance, although, during these applications visual deterrence is the primary function. Security and safety applications depend upon higher levels of impact resistance. The key distinction between the 2 is safety designs are worried with stopping accidental breach of any defined space, whereas security is all about stopping intentional ramming.
Closely spaced lines of bollards can form a traffic filter, separating motor vehicles from pedestrians and bicycles. Placing the posts with 1 m (3 ft) of clearance between the two, as an example, allows easy passage for humans and human-powered vehicles – like wheelchairs or shopping carts – but prevents the passage of cars. Such installations tend to be seen before zcvjbu parking area entrance to your store, as well as at the mouths of streets transformed into outdoor malls or ‘walk streets’. In designing bollard installations for a site, care has to be taken to avoid locating them where they will likely be a navigational hazard to authorized vehicles or cyclists.
Some applications for traffic guidance depend on the cooperation of drivers and pedestrians and do not require impact resistance. A collection of bollards linked by way of a chain presents a visual cue never to cross the boundary, although it may be easy enough for any pedestrian to visit over or under the chain if they choose. Bollards created to direct traffic are sometimes created to fold, deflect, or break away on impact.
Adding greater collision resistance allows a bollard to enforce traffic restrictions instead of merely suggesting them. Plain pipe bollards are often placed in the corners of buildings, or flanking lamp-posts, public phones, fire hydrants, gas pipes along with other installations that should be protected against accidental contact. A bollard in the fringe of a roadway prevents cars from over-running sidewalks and harming pedestrians. Bell-shaped bollards can certainly redirect a car back on the roadway when its wheels hit the bollard’s sloped sides.
These are employed where U-turns and tight-radius turns are frequent. This type of usage is particularly common at corners where vehicle drivers often misestimate turns, and pedestrians are specifically near to the roadbed waiting to cross. In some cities, automatically retractable impact-resistant bollards are installed to manage the flow of traffic into an intersection. Internet videos of ‘bollard runners’ graphically demonstrate the potency of even a low post at stopping cars.