One needs only to stay a pointy eye to ascertain bollards around us a day . In parking lots, driveways, and drive-thru lanes, bollards are wont to protect buildings, teller machines, utilities like gas meters, electrical equipment and fire hydrants, handicap parking signs, gate entry keypads, and to limit access to undesired areas. In factories and warehouses, bollards are important for shielding pedestrians also as guarding storage racks and capital equipment from fork truck collisions.
Other industries which find an important use of bollards include automated car wash facilities, self-storage facilities, gas stations and convenience stores, propane dispensing, and parking garages, among others.
Bollards Installation are utilized in a myriad of applications, for one among several purposes:
Equipment Protection
Utility Protection
Building Protection
Access Restriction
Pedestrian Safety
Foundation mounted bollards are typically installed in one among two ways. The first, least expensive way, is with a plate mounted bollard. These bollards are steel pipes welded to a flat plate which will be anchored to a tough surface using concrete anchors. This method of installation is quick and cheap , requiring the installer to drill four to eight holes within the concrete and bolt down the bollard with expansion or screw anchors.
The downside to the present installation method, when used with a rigid bollard, is that the anchors are generally not strong enough to face up to anything quite a minor collision. The plate anchors often are pulled up and possibly the plate bends, leaving a post which leans and is not any longer ready to properly serve its purpose. Plate mounted bollards often require constant maintenance and replacement.
The second method for installing bollards involves employing a longer steel pipe and burying some of it deep within the ground. This method gives the bollard much more strength than surface mounted, however it are often very expensive to put in if the surface is concrete and already poured. Installation during this case requires coring a hole within the surface using an upscale diamond bladed coring saw. These machines and their blades are expensive and need water cooling, creating a multitude during installation. Once the concrete is cored and therefore the bollard is in situ , the opening must be backfilled with concrete to secure the bollard. For added strength, these bollards are often crammed with concrete, as well. Though the bollard pipe itself is comparatively inexpensive, this installation method is expensive and time consuming.
Although very strong, there are significant disadvantages to core installations. most significantly , there's no give to the present system upon impact. Though desired in high security applications, any vehicle impacting such a bollard are going to be significantly damaged and its passengers in danger of injury. Loads carried by fork trucks also can be thrown given the jarring impact likely to occur. Further, the bollard or its foundation are often damaged by such an impression , again leaving a tilted and fewer effective barrier requiring costly maintenance to correct. Often the steel bollard itself is beyond repair and must get replaced with a completely new bollard.
Another disadvantage of this sort of installation is that it's a permanent installation with little flexibility for movement. In factory applications, equipment is usually moved and rearranged. Bollards wont to protect equipment or storage racks which are core-installed aren't easily moved. The concrete surrounding the bollard must be broken out and therefore the large remaining hole filled, leaving a factory floor filled with unsightly patches. If the bollard itself is reusable after removal, the whole expensive installation process is started over at the new location.
Some designs are created to aim to unravel these problems through the utilization of plastic or spring loaded bollards, however these designs suffer from a scarcity of strength. If the plastic is of insufficient stiffness, the whole function of access denial is lost. On the opposite hand, very stiff plastic designs have had difficulty with future durability. Minor collisions tend to wear away at such devices, and in outdoor applications UV degradation becomes a priority .
Designed and patented in Europe by Belgian inventor Gerard Wolters may be a unique system which solves many of the issues related to traditional foundation mounted bollards. Simply put, the system uses a compressed rubber base to act as an energy absorbing mass. This elastomer allows the bollard to tilt slightly when impacted, within the range of 20 degrees from vertical, then return upright while still stopping the colliding vehicle.
The design consists of 4 major pieces:
# Elastomer
# Base
# Adapter
# Post
This system is attached to concrete using concrete anchor screws. These anchors affix the bottom component over the adapter, which pre-compresses the elastomer against the bottom . the bottom and adapter pieces are made from a special ductile forged iron , which makes the pieces less brittle than typical forged iron , and also features a very low (-40 degrees) brittleness temperature. The steel pipe which is the bollard post may be a typical steel pipe inserted into the adapter. Standard pipe is employed to offer the top user the pliability to weld fencing using standard components if necessary. Concrete fill isn't required inside the bollard pipe, though is permitted. In fact, sign posts are often inserted into the post and concrete filled in situ .
Upon collision, the pipe and adapter are allowed to tilt within the bottom , forcing the adapter to further compress the elastomer within the direction of the impact. The elastomer absorbs much of the energy of the impact and elongates the deceleration time of the vehicle. The elastomer is of sufficient strength to then rebound, usually pushing the vehicle faraway from the bollard and returning to an upright position. the lean of the pipe is restricted to approximately 20 degrees at which point the bollard will become rigid.
Bollards are designed during a sort of sizes, each of which is acceptable for various expected collision speeds and much . Further, modular connectors which may be wont to create fencing and guards out of multiple base units are created to eliminate welding. By using multiple base units, the last word strength of the rebounding bollard unit are often increased.
These new bollards utilize the much simpler method of surface installation, greatly reducing installation costs, while maintaining the pliability to maneuver bollards as conditions warrant. this is often accomplished without the traditional disadvantage of lack of strength, because the elastomer within the bollard system greatly reduces the utmost impact forces applied to the bottom anchors. this is often because deceleration of an impression ing vehicle is far less severe than during an impact with a rigid bollard. Energy is transferred to the elastomer rather than on to a rigid post, reducing the tough impact of a comparatively immovable object. Read More..
