The popularity of bollards has dramatically increased during the past decade as a result of heightened fears about security. They are a basic, practical, and cost-effective method of erecting anti-ram perimeter defense without developing a visual sense of a fortified bunker. Bollards are popular for traffic direction and control, and in purely attractive applications. On the other hand, where to buy bollards can offer many characteristics beyond security. They can be used for purely aesthetic purposes, functioning as landscaping elements. Bollards can create visible boundaries of any property, or separate areas within sites. They can control traffic and 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 number of circumstances. They frequently tell 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 own building exteriors and surrounding areas. Bollards can incorporate other functions including lighting, security cameras, bicycle parking or even seating. Decorative bollards are made in a number of patterns to harmonize with a wide range of architectural styles. The prevalence of the very most common form 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 Is A Bollard?
A bollard is really 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 created in cast iron or steel and shaped somewhat such as a mushroom; the enlarged top was created to prevent mooring ropes from slipping off.
Today, the phrase bollard also describes many different structures used on streets, around buildings, and then in landscaping. According to 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 availability of former cannons was applied 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 definitely 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 a majority of are cylindrical, sometimes using a domed, angled, or flat cap. They are available in a selection of metallic, painted, and durable powder coat finishes.
Removable bollards are used where the necessity to limit access or direct traffic changes occasionally. Both retractable and fold-down styles are employed where selective entry is frequently needed, and are designed therefore 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 rely on how much they weigh as opposed to structural anchoring to remain in place. They are designed to be moved rarely, then simply with heavy machinery like a fork-lift.
Bollards generally fall into three varieties of applications:
Decorative Bollards – decorative bollards for architectural and landscaping highlights;
Traffic and Safety Bollards – bollards that offer 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 could border, divide, or define a space. 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 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 discourage passersby from leaving trash or using them for impromptu seating. On the other hand, they 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 frequently made of iron or aluminum casting. Aluminum bollards are desirable for applications where weight is a concern, such as a removable bollard. Aluminum units are generally a little more expensive than iron. For applications in which 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 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 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 eye. If high-finish consistency is desired, seek a manufacturer which will machine 100% in the surface after casting to create units using a uniform surface for maximum visual appeal.
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 reasonably aggressive environment; petrochemical residues and splashes of diluted road de-icing salts may compromise some painted finishes. Factory-applied powder coating – which is available on iron, aluminum, and steel – is surely an especially durable type of painted finish. The application form 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 procedure that completes the conclusion gives it additional toughness and abuse resistance.
In applications where greater physical abuse is predictable, plastic bollard made from aluminum can be a better choice than iron. If the finish coat is damaged, aluminum oxidizes to your color that is certainly generally more acceptable compared to the red rust created by iron. Aluminum and stainless can also be found in a variety of bare metal finishes. Functionality can be put into the otherwise decorative bollard. For instance, common choice is the chain eye – linking 2 or more bollards with chain, making a simple traffic direction system. A big 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 might also contain lighting units or security devices, like motion sensors or cameras.
Traffic and Safety Bollards
The most typical bollard applications are traffic direction and control, together with safety and security. The very first function is achieved from the visual presence from the bollards, and to some extent by impact resistance, although, in these applications visual deterrence will be the primary function. Security and safety applications depend on higher levels of impact resistance. The key difference between the 2 is safety designs are worried with stopping accidental breach of any 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, as an example, allows easy passage for humans and human-powered vehicles – including wheelchairs or shopping carts – but prevents the passage of cars. Such installations tend to be seen facing zcvjbu parking area entrance to a store, and at the mouths of streets transformed into outdoor malls or ‘walk streets’. In designing bollard installations for any site, care should be taken to avoid locating them where they will become a navigational hazard to authorized vehicles or cyclists.
Some applications for traffic guidance depend on the cooperation of drivers and pedestrians and you should not require impact resistance. A line of bollards linked by way of a chain presents a visual cue not to cross the boundary, although it could be easy enough for any pedestrian to visit over or beneath the chain when they choose. Bollards created to direct traffic are often 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 frequently placed in the corners of buildings, or flanking lamp-posts, public phones, fire hydrants, gas pipes as well as other installations that need to 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 in fact 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 kind of usage is especially common at corners where vehicle drivers often misestimate turns, and pedestrians are especially close to the roadbed waiting to cross. In certain 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 effectiveness of a low post at stopping cars.