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Installing Flexible Bollards with Flanged Mountings

Home > Bollards > Bollard and Post Cover Installation > Installing Flexible Bollards with Flanged Mountings

Flexible bollards that feature a flange at their base can be installed on existing concrete surfaces using drop-in concrete anchors. Flexible bollards will bend up to 90° upon impact to reduce damage to vehicles, making them ideal for traffic applications. They can be used for lane demarcation, or creating architectural perimeters that are traffic friendly.

Drop-in anchors should only be installed in fully cured concrete that is at least 4″ thick.(1) All measurements in this installation guide assume a bare, level concrete surface.

It is important to note that with this installation method, the bollard’s function is strictly visual and it will offer little impact resistance.






Flexible Bollard, Surface Mount



1/2″ Drop-In Concrete Insert



1/2″ Washer



1/2″ Head Bolt



Reflective Tape (optional)



Broom/Pressure Washer



Measuring Tape


5/8″ Masonry Drill Bit

1/2″ Insert Setting Tool

5/16″ Hex Key


Hammer Drill or Rotary Hammer


Diagram showing a parts list for flexible flanged mountings

Before installation

Check for hazards
Always check for hazards such as water pipes, gas lines, and underground wiring before drilling.

Clean the surface
Dirt and debris can affect the line of sight and disrupt placement of the bollards.

Use a broom or pressure washer to clean the concrete surface prior to bollard installation.

Study the site plans
Site plans are generally created by the architect of the project.

Refer to site plans to locate and mark the precise center point of each bollard.

Create hole markings
Keep the bollard in its protective packaging. Place the bollard over each center point marking so that the bollard’s middle coincides with the center point.

Use chalk to create drill-markings for each bolt.

For secure installation, ensure there is a minimum radius(2) of solid concrete around each hole for the drop-in insert.

Remove the bollard.

Note: Be sure to make any necessary adjustments to the orientation now. Once drilled and installed, there is no way to rotate the bollard.

Drill the holes

Create pilot holes
Tap pilot divot holes in the center of each mark.

This will prevent the hammer drill or rotary hammer from drifting while boring the holes.

Set the depth control on the Hammer Drill (or Rotary Hammer) to 2″
If depth control is not available, mark 2″ on the masonry bit.

Drill the holes
Drill a hole that has a 5/8″ diameter and 2″ depth.

Drill on high speed, using the hammer function if available.

Check the masonry bit often to ensure it remains free of debris.

Diagram showing the drill digging into the cement with depth control at 2 inches and 5/8 inch diameter

Secure the Bollard

Clear and clean the holes
Clear the holes of all debris and/or standing water using the vacuum.

Diagram showing a vacuum clearing the hole of debris

Tap the drop-in insert into each hole
With the slotted end facing down, drive the drop-in inserts (A) down until the top sits flush with the surface of the concrete.

Set the concrete insert
Insert a setting tool (B) into each hole, then hammer down.

If a proper setting tool is not available, an equivalent flat-end punch can be used.

This will cause the internal expansion plug to set the concrete insert in place.

Diagram showing a setting tool (B) inserted into each hole with the drop-in inserts (A) and then hammered down

Set the bollard over the holes
Keep the bollard in its protective packaging. Carefully set the bollard base over the installation position so that the bollard’s bolt holes are directly on top of the drilled holes and concrete inserts.

When ready to install, remove the protective packaging.

Secure the bollard
Place the washers over the holes on the bollard and set the bolts into place.

Diagram showing washers over the holes on the bollard base

Use a hex key to tighten the bolts until secure. Tighten bolts evenly in a cycle.

Diagram showing a hex key tightening the bolts on the bollard base


Inspect the installation
From a distance, examine the plane of view.

Ensure the bollard is plumb.

Check the bollard for any signs of surface damage
For damage repair or other servicing needs, please contact Reliance Foundry’s sales department.

Care and maintenance

Reliance Foundry manufactures its products to the highest design standards to ensure their durability. Reliance Foundry’s bollards are finished with long-lasting powder coating. In most North American environments, routine inspections and cleaning will ensure that bollards retain their aesthetic appeal. Proper care and maintenance are required to maintain the finish and ensure a full service life.

1. Concrete insert manufacturers such as www.ucanfast.com recommend a greater concrete depth for drop-in inserts.

2. Concrete insert manufacturers such as www.ucanfast.com recommend an anchor spacing of 7-1/2″, and a minimum edge distance of 9″ for 100% performance.

Diagram showing a flexible bollard with flanged mountings installed in existing concrete
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