Knowing the difference between the bollards is very important to avoid unnecessary costs. Security bollards are used for various purposes and for many applications. They can be designed in many ways and with various features that to suit site-specific conditions which helps project owners tailor solutions for their existing building or new project site. The following features and types are worth considering:
Fixed Bollards (Passive)
These are permanently positioned and cannot be moved from one place to another, as their name suggests.
Movable Bollards (Active)
Security bollards that specifically designed to be removed to give temporary access to authorized vehicles like in delivery station entrances. According to the size of movable bollards, they can be totally removed by hand from the ground embedded sleeve, automatically retracted underground by a push button or semi-automatically retracted underground by using a hand drill machine.
Surface Base Plate Mounted Bollards
These bollards, sometimes called bolt down bollards, are fixed to a hard surface using a base plate. The minimum crash rating can be achieved in this case.
Underground Base Plate Mounted Bollards
These bollards are bolt down bollards but the base plate is fixed to the underground footing.
Deep Embedded Bollards
The bollard (if permanent type) or the socket of the bollard (if movable) is buried underground in concrete, re-bars can be used to increase the crash rating level.
Shallow Mounted Bollards
To minimize the excavation depth in areas where a deep foundation is not possible or not allowed, a shallow steel foundation (a flat hard surface) can be used.
Bollard Cover Design
Bollards may serve as architectural fixtures. They are used to enhance the elegance of the surroundings. Bollard covers may come as customized design with unusual shapes to attract the visitor’s attention.
Bollard Cover Shapes and Cap Design
Bollard covers could be any shape and style but the common are round and square shapes. Bollard caps also come with endless designs but the common cap mostly used are flat, dome, semi-dome or 45-degree caps.
Bollard Cover Finishing
Stainless Steel (304 or 316), Aluminium, PVC, Coated or painted with a corrosion resistant layer.
Bollard Cover Accessories
To enhance the visibility of the bollard cover, some accessories and features may be added like LED light, reflective tape, an emblem or commercial logo.
Bollard Base Plate Cover Design
It has many other names like the base collar, the bollard skirt or flange cover. It is essential for the collar to have the same finish of the bollard cover to look like a single piece of product.
Bollard Cover Size
The diameter or width of the bollard cover is limited to the central bollard size (round or square), a proper space between the bollard and the cover should be maintained for easy insertion. The size of both the bollard and the cover is limited to the standard sizes of the steel pipes available in the market. The height can be customized without limit unless used as a security bollard, where the height of the main bollard should not be less than the certified crash rating design.
Bollard Crash Rating Level
K4, K8, and K12 are the first and very well-known crash rating system for vehicle security bollards and every new crash rating system created always refers to the K-rating system first identified by the US Department of State (DOS) that is based on the impact speed of a 15,000 lb. vehicle traveling at speeds of 30, 40 and 50 mph respectively.