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The prominence of bollards has dramatically increased in the past decade because of heightened fears about security. These are an easy, practical, and cost-effective means 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 decorative applications. However, steel bollards price can serve many features beyond security. They can be used purely aesthetic purposes, functioning as landscaping elements. Bollards can create visible boundaries of a property, or split 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 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 own building exteriors and surrounding areas. Bollards can incorporate other functions like lighting, surveillance cameras, bicycle parking or perhaps 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 bollard, 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 for 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, and they are generally still being used today. A normal marine bollard is created 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 term bollard also describes many different structures applied to streets, around buildings, and then in landscaping. Based on legend, the initial street bollards were actually cannons – sometimes said to be captured enemy weapons – planted in the earth as boundary posts and town markers. If 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 that are widely employed on roads, especially in urban areas, in addition to outside supermarkets, restaurants, hotels, shops, government buildings and stadiums.

The most common type of bollard is fixed. The easiest 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 also a multitude of decorative designs. Some feature square or rectangular cross-sections, but most are cylindrical, sometimes using a domed, angled, or flat cap. They come in a variety of metallic, painted, and sturdy powder coat finishes.

Removable bollards are utilized where the need 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 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 their weight rather than structural anchoring to stay in place. They are made to be moved rarely, then simply with heavy machinery such as a fork-lift.

Bollards generally belong to three varieties of applications:

Decorative Bollards – decorative bollards for architectural or 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

Decorative Bollards

Some bollards are intended purely to get an ornament. As standalone architectural or landscaping features, they are able to border, divide, or define an area. They may also be accents, sentries, or supporting players to larger, more dramatic architectural gesture.

Decorative bollards are manufactured to harmonize with both traditional and contemporary architectural styles. The latter lean toward visual simplicity – often straight-sided posts with a number of reveals near the top. Styles designed to match various historic periods normally have more elaborate shapes and surface details. Such as 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 come with a simple rounded or slanted top to deter 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 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 problem, for instance a removable bollard. Aluminum units are generally slightly more expensive than iron. For applications where a decorative bollard might 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 regular foundry technique that is certainly economical and well-fitted to objects this size. However, sand-cast objects frequently bear surface irregularities that tend to leave the finished product less appealing to the eye. 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 maximum looks.

Finish is a vital consideration in a decorative bollard, from functional as well as 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 fairly 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 an especially durable type of painted finish. The application form process builds up 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, plastic bollards made of aluminum might be a better choice than iron. If the finish coat is damaged, aluminum oxidizes to some color that is certainly generally more acceptable than the red rust created by iron. Aluminum and stainless steel are also available in a quantity of bare metal finishes. Functionality may be put into the otherwise decorative bollard. For example, common option is the chain eye – linking several bollards with chain, developing 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 increasing numbers of people seek alternative green transportation. Bollards may also contain lighting units or security devices, such as motion sensors or cameras.

Traffic and Safety Bollards

The most frequent bollard applications are traffic direction and control, together with security and safety. The initial function is achieved from the visual presence of the bollards, and at some level by impact resistance, although, within these applications visual deterrence is the primary function. Safety and security applications depend on higher degrees of impact resistance. The key difference between the 2 is safety designs are concerned with stopping accidental breach of a 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 – such as wheelchairs or shopping carts – but prevents the passage of cars. Such installations are frequently seen in front of zcvjbu parking lot entrance to some store, as well as at the mouths of streets converted to outdoor malls or ‘walk streets’. In designing bollard installations for any site, care must be taken to avoid locating them where they are going to become 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 type of bollards linked by way of a chain presents a visual cue not to cross the boundary, though it might be easy enough for a pedestrian to go over or beneath the chain if they choose. Bollards made to direct traffic are occasionally made 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 in the corners of buildings, or flanking lamp-posts, public phones, fire hydrants, gas pipes as well as other installations that should be protected against accidental contact. A bollard on the edge 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.

They are employed where U-turns and tight-radius turns are frequent. This sort of usage is particularly 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 potency of even a low post at stopping cars.

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