Plastic Bollard Covers – Learn More..

There are three basic kinds of bollard mountings: fixed, removable, and operable (retractable or fold-down). Fixed bollards may be mounted into existing concrete, or installed in new foundations. Manufactured bollards are frequently made with their own mounting systems. Standalone mountings can be as non-invasive as drilling into existing concrete and anchoring with epoxy or concrete inserts. Such surface-mounted bollards can be used for purely aesthetic installations and substantial visual deterrence and direction, but provide only minimal impact resistance.

Bollards designed to protect against impact are generally embedded in concrete several feet deep, if site conditions permit. Engineering of the mounting is dependent upon design threat, soil conditions along with other site-specific factors. Strip footings that mount several bollards have better resistance, spreading the impact load over a wider area. For sites where deep excavation is not desirable or possible (e.g. an urban location with a basement or subway beneath the pavement), bollards made out of shallow-depth installation systems are accessible for both individual posts and groups of bollards. Generally, the shallower the mounting, the broader it must be to face up to impact loading.

A removable bollard typically includes a permanently installed mount or sleeve below grade, as the sleeve’s top is flush with all the pavement. The mating bollard may be manually lifted out of the mount to allow access. This system is meant for locations in which the change of access is occasionally needed. It can include a locking mechanism, either exposed or concealed, to avoid unauthorized removal. Both plain and decorative bollards are accessible for this kind of application. Most removable bollards are not intended for high-impact resistance and therefore are usually not found in anti-ram applications.

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Retractable bollards telescope down below pavement level, and could be either manual or automatically operated. Manual systems sometimes have lift-assistance mechanisms to ease and speed deployment. Automatic systems could be electric or hydraulic and often include a dedicated backup power installation and so the bollard remains functional during emergencies. Retractable systems tend to be unornamented.

Bollards are as ubiquitous because they are overlooked. They speak to the requirement for defining space, one of many basic tasks in the built environment. Decorative bollards and bollard covers provide a versatile solution for bringing pleasing form to a variety of functions. The plethora of available options is vast in terms of both visual style and gratification properties. For security applications, a design professional with security expertise ought to be within the planning team.

According to Weidlinger Associates principal, Peter DiMaggio – a specialist in security design – careful assessment of the surrounding website is required. “Street and site architecture will determine the highest possible approach speed,” he stated. “If there are no approaches to the building using a long term-up, an attack vehicle cannot build up high-speed, and the resistance from the anti-ram barriers could be adjusted accordingly.”

Anti-ram resistance is often measured using a standard designed by the Department of State, known as the K-rating. K-4, K-8 and K-12 each reference the cabability to stop a truck of any specific weight and speed and prevent penetration of the payload more than 1 m (3 ft) past the anti-ram barrier. Resistance depends not only on the size and strength from the bollard itself, but additionally on the way it is anchored and the substrate it’s anchored into.

Videos of bollard crash tests are featured on several manufacturer’s Internet sites. The truck impacts 2 or 3 bollards at high-speed, and also the front from the vehicle often crumples, wrapping completely across the centermost post. Portion of the cab may fly off the truck, the front side or rear end could rise several feet inside the air, and front or rear axles might detach. The bollards along with their footings are often lifted several feet upward. In every successful tests, the payload on the back from the truck will not pauxnp a lot more than 1 meter past the collection of bollards, thus satisfying the standard.

The most basic security bollard is a bit of 203-mm (8-in.), 254-mm (10-in.), or 305-mm (12 in.) carbon steel structural pipe. Some impact resistance is achieved despite having a 102-mm (4-in.) pipe, depending on the engineering of its foundation. It is usually loaded with concrete to increase stiffness, although unfilled pipe with plate stiffeners inside may actually produce better resistance in the same diameter pipe. Without any kind of internal stiffening, the pipe’s wall-thickness needs to be significantly greater. For fixed-type security bollards, simple pipe bollards might be functionally sufficient, if properly mounted. Undecorated pipe-type bollards can also be specially manufactured.

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