Removable Bollard System and Method of Installation

Abstract

An anti-ram removable bollard (10) assembly and an installation of the same to arrest impacts are provided. The removable bollard assembly comprises a base assembly (20) and at least a reinforcement member (32a,32b) to be fixedly installed on site, and a removable bollard member to be detachably secured to the base assembly as and when required. A coupling mechanism (42,44,48) may be provided in the base assembly to engage the removable bollard member. Also, the base assembly may include an I-beam cross-section arrangement (22,24,26) to provide increased strength to the base assembly. Several base assemblies may be connected by rebars (104) to form a cohesive installation which restrains movement when any bollard member in the installation is struck. With the cohesive arrangement, a high impact rating may be achieved even with shallow base assemblies.

Description

FIELD OF INVENTION[0001]The invention relates to an anti-ram bollard assembly in which the bollard member is removable, and to deployment of multiple removable bollard assemblies to arrest vehicular attacks and prevent penetration of the vehicle. The invention also relates to a method of installing a barrier system comprising a plurality of removable bollard assemblies.BACKGROUND OF THE INVENTION[0002]In recent years for security reasons, many prominent establishments such as government buildings, embassies, convention centres, public transportation hubs and other perceived terrorist targets have been equipped with barrier systems to protect the establishments from vehicle attacks. Especially if the vehicle is heavyweight or moving at high speeds or carrying explosives, the attack can cause extreme destruction.[0003]Various barrier systems have since been employed with the intention of protecting buildings and structures from attacks. Metal or concrete barriers may be erected around...

AI Technical Summary

Benefits of technology

"The invention provides a removable bollard assembly that can be installed in shallow trenches without disrupting utility lines. The depth of the trenches can be very shallow, while the impact rating of the bollard assembly can be improved over conventional bollards of similar form factors. The base assembly of the bollard assembly includes a sleeve and a coupling mechanism to removably engage the bollard member to the base assembly. A plurality of spaced apart base assemblies can be deployed to form a cohesive installation, effectively distributing the impact force or load among various base assemblies in the installation. The bollard member can be removed to permit penetration. The invention enhances the flexibility of the barrier installation and increases the impact rating of a barrier installation without significantly increasing the dimensions of the bollard assemblies."

Problems solved by technology

Especially if the vehicle is heavyweight or moving at high speeds or carrying explosives, the attack can cause extreme destruction.

In order to resist large impacts from speeding heavy vehicles, the barriers have to be massive, resulting in a less aesthetic system.

Because utilities transmission such as electricity lines, water pipes and communications lines are often buried underground, deep excavation to install bollards is costly and time-consuming.

In addition, deep excavation causes disruption to utility services, inconvenience to pedestrian traffic, and often results in a less aesthetic landscape.

Many conventional bollards are permanent fixtures which may not be easily removed from site.

Providing a deep recess, however, may not be possible in structures where an installation surface is above ground and has limited excavation depth, including but not limited to, bridges.

Further, these retractable bollards may not be able to withstand large impact forces.

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