The prominence of bollards has dramatically increased in the past decade due to heightened worries about security. They are a basic, practical, and cost-effective means of erecting anti-ram perimeter defense without creating a visual sense of a fortified bunker. Bollards are widely used for traffic direction and control, as well as in purely decorative applications. However, safety bollards for sale can serve many functions beyond security. They can be used for purely aesthetic purposes, functioning as landscaping elements. Bollards can create visible boundaries of any property, or split areas within sites. They can control traffic and are often set up 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 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 perhaps seating. Decorative bollards are created in a selection of patterns to harmonize with a wide range of architectural styles. The prevalence of the most common kind 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 actually a short vertical post. Early bollards were for mooring large ships at dock, plus 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 word bollard also describes a number of structures applied to streets, around buildings, and then in landscaping. According to legend, the initial street bollards were actually cannons – sometimes reported to be captured enemy weapons – planted in the ground as boundary posts and town markers. Once the flow of former cannons was utilized up, similarly shaped iron castings were made to match the same functions. Bollards have since become many varieties that are widely employed on roads, particularly in urban areas, along with outside supermarkets, restaurants, hotels, shops, government buildings and stadiums.
The most frequent form 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 offered in a variety of metallic, painted, and durable 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 therefore are designed and so the bollard can be simply 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 as opposed to structural anchoring to stay in place. They are created to be moved rarely, and after that only with heavy machinery like a fork-lift.
Bollards generally fall into three types of applications:
Decorative Bollards – decorative bollards for architectural and/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 get 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 produced to harmonize with both traditional and contemporary architectural styles. The latter lean toward visual simplicity – often straight-sided posts with several reveals nearby the top. Styles created to match various historic periods usually have more elaborate shapes and surface details. Included in this are flutes, bands, scrolls along with other ornamentation.The post-top is really 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 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 from iron or aluminum casting. Aluminum bollards are desirable for applications where weight is an issue, such as a removable bollard. Aluminum units are generally a little more expensive than iron. For applications when a decorative bollard may be subjected 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 usually manufactured by sand-casting – a regular 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 attractive to the attention. If high-finish consistency is desired, seek a manufacturer that will machine 100% from the surface after casting to generate units with a uniform surface for max appearance.
Finish is a crucial consideration in a decorative bollard, from functional along with 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 some painted finishes. Factory-applied powder coating – that is available on iron, aluminum, and steel – is definitely an especially durable kind of painted finish. The applying process builds 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 conclusion gives it additional toughness and abuse resistance.
In applications where greater physical abuse is predictable, plastic bollards manufactured from aluminum can be a better option than iron. If the finish coat is damaged, aluminum oxidizes to some color which is generally more acceptable than the red rust produced by iron. Aluminum and stainless-steel are also offered in a number of bare metal finishes. Functionality could be added to the otherwise decorative bollard. As an example, common choice is the chain eye – linking several bollards with chain, making a simple traffic direction system. A sizable metal loop or arm on the side in the post allows parking and locking of bicycles, an extremely popular choice as increasing numbers of people seek alternative green transportation. Bollards might also contain lighting units or security devices, including motion sensors or cameras.
Traffic and Safety Bollards
The most common bollard applications are traffic direction and control, together with security and safety. The very first function is achieved by the visual presence from the bollards, and to some degree by impact resistance, although, within these applications visual deterrence is definitely the primary function. Safety and security applications rely on higher degrees of impact resistance. The major distinction between the 2 is safety designs are concerned with stopping accidental breach of the defined space, whereas security is 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 them, for 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 facing zcvjbu parking lot entrance to your store, as well as at the mouths of streets converted to outdoor malls or ‘walk streets’. In designing bollard installations for a site, care has to be taken to avoid locating them where they will be a navigational hazard to authorized vehicles or cyclists.
Some applications for traffic guidance depend on the cooperation of drivers and pedestrians and never require impact resistance. A collection of bollards linked with a chain presents a visual cue never to cross the boundary, even though it may be easy enough for any pedestrian to travel over or underneath the chain if they choose. Bollards designed to direct traffic are occasionally created to fold, deflect, or break away on impact.
Adding greater collision resistance allows a bollard to enforce traffic restrictions as opposed to merely suggesting them. Plain pipe bollards are usually placed at the corners of buildings, or flanking lamp-posts, public phones, fire hydrants, gas pipes and other installations that need to be protected from accidental contact. A bollard in the side of a roadway prevents cars from over-running sidewalks and harming pedestrians. Bell-shaped bollards can actually redirect a car back to the roadway when its wheels hit the bollard’s sloped sides.
These are employed where U-turns and tight-radius turns are frequent. This sort of usage is extremely common at corners where vehicle drivers often misestimate turns, and pedestrians are specifically close to the roadbed waiting to cross. In a few 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 strength of a low post at stopping cars.