Bollards are sturdy posts installed in public and private spaces to control vehicular traffic, increase safety and protect property. While bollards may seem simple on the surface, their construction process requires careful design to ensure strength, durability and functionality. The design and construction of bollards can vary depending on their type and intended use, such as fixed, removable or automatic bollards.
This article will detail the typical structural components of a bollard and the installation process.
1. Materials used in bollard construction
The materials used for bollards determine their strength, durability, and use. Commonly used materials include:
Steel: The most widely used material, especially for safety and traffic bollards. Often filled with concrete for added strength.
Concrete: It used for permanent installations and heavy-duty applications such as crash barriers.
Stainless steel: The material of choice for architectural or decorative bollards due to its corrosion resistance and smooth appearance.
Plastic or polyurethane: It used for flexible or temporary bollards, such as parking lots or event spaces.
Cast Iron or Aluminum: It typically used for decorative or historic applications in urban environments.
2. Core Structural Components
A standard bollard typically consists of the following components:
Bollard body (column): The upright visible part, which may be cylindrical, square or of decorative design.
Mounting base or anchorage: It used to secure the bollard to the ground. Fixed bollards are usually embedded in a concrete foundation.
Sleeve (optional): A cover over a bollard post for aesthetic or protective purposes. It is easy to replace and does not require complete reconstruction.
Reinforcement (optional): For high security bollards, internal steel reinforcement or a concrete core can be added to increase impact resistance.
3. Installation and foundations
The strength of a bollard usually depends on the way it is installed. Their construction varies according to type:
Fixed bollards (recessed)
Dig a deep pit (usually 300-600 mm wide and 600-1200 mm deep, depending on impact resistance requirements).
Place the bollard into the pit.
The base is filled with concrete and the bollard is anchored to the ground.
In some cases, steel reinforcement is added for structural strength.
Surface-mounted bollards
They are anchored directly to existing concrete or pavement using anchor bolts.
Easier to install, but less impact resistant.
Ideal for areas where heavy-duty protection is not required.
Removable or automatic Bollards
Installed using an in-ground sleeve or mechanical enclosure embedded in concrete.
Bollards can be locked or folded into the ground.
More complex installations are required to accommodate locking or hydraulic mechanisms.
4. Finishes and Coatings
To protect bollards from the effects of weather, corrosion, and impact, bollards are typically treated with the following:
Galvanized: prevents steel from rusting.
Powder coating or paint: enhances color, visibility and aesthetics.
Reflective strips or tape: Enhances nighttime visibility.
Polymer or plastic sleeves: Prevents surface damage and is easy to maintain.
5. Compliance and Safety Standards
Bollards, especially in safety-sensitive or public areas, must usually meet certain safety standards:
Crash bollards (e.g. ASTM F2656, PAS 68): Tested to stop a specific weight of vehicle at a specific speed.
ADA compliant: to ensure that the bollards do not impede access for people with disabilities.
Overall, there are simple and complex structures for bollards. It needs to be designed and used according to different usage situations.