Bollards
How to Install a Removable Bollard (Sleeve Method)
Cojo
May 7, 2026
6 min read
A removable bollard installs by setting a permanent below-grade sleeve in concrete, then dropping the lift-out bollard post into the sleeve and locking it in place. The sleeve becomes the permanent infrastructure; the bollard itself can be removed in seconds for service-lane access, fire-truck entry, or special-event vehicle passage. Cojo set six removable bollards on a Bend resort delivery service-lane in February 2026 -- the property needed daily morning service-vehicle access plus 24/7 perimeter protection, and the lift-out design solved both. This guide walks the sleeve-method install step by step.
For the broader category, see our What Are Bollards hub. For comparison with fixed bollards, see Fixed vs Removable Bollards. For top product picks, see Best Removable Bollards.
The sleeve method splits the install into two parts:
When the bollard is removed, the sleeve socket is covered with a hinged cap or threaded plug that sits flush with the pavement. Vehicles can pass over the sealed socket without obstruction.
A removable bollard install requires:
Most reputable manufacturers ship the sleeve, bollard, lock, and cap as a matched system. Mixing components from different manufacturers is rarely worth the savings -- the sleeve and bollard fits depend on each other.
Removable bollards typically appear in groups of two to six along a service lane or fire access. Layout principles:
For fire-lane spacing requirements, NFPA 1 Fire Code adopted by most Oregon jurisdictions requires fire-access lanes to remain unobstructed but allows controllable barriers like removable bollards.
The sleeve install excavation is typically smaller than a fixed-bollard footing because the sleeve is shorter than a full embedded bollard.
For a typical 4 or 6 inch sleeve:
The U.S. Federal Highway Administration drainage guidance applies because the sleeve interior must drain. Without bottom drainage, the sleeve fills with water and corrodes.
The sleeve top must finish flush with the surrounding pavement -- both for vehicle pass-over and for proper bollard height. Mark the planned pavement grade with chalk on the side of the excavation. Verify the sleeve top will sit at that mark when set.
The sleeve install is a one-shot pour. Mistakes cannot be corrected once concrete cures.
Place 4 to 6 inches of compacted 3/4-inch crushed rock at the bottom of the excavation. The gravel allows water that enters the sleeve to drain through the bottom.
Set the sleeve centered in the excavation with the top at the marked pavement grade. Verify plumb on two perpendicular faces. Most sleeves include integral fins or anchors that lock into the surrounding concrete.
The sleeve must not move during the pour. Wedge with shims or temporary lumber at the top edge. Some installers tape the sleeve top to prevent concrete from entering during the pour.
Pour 4,000-psi concrete around the sleeve in 6 to 8 inch lifts. Tamp each lift to eliminate voids. Top off with concrete sloped to shed water away from the sleeve.
The American Concrete Institute ACI 318 covers structural concrete around embedded steel.
Cure timing for the sleeve install:
The bollard post can drop into the sleeve at any point after concrete sets, but vehicle traffic over the sleeve cap should wait the full 72 hours minimum.
Three lock styles dominate removable bollards:
For fire-lane use, the lock must be accessible to fire department personnel via Knox-Box key system or matched master key. Verify with the local fire marshal during permit review.
Long-term sleeve performance depends on routine maintenance:
For Bend-area work where Cojo handles a lot of resort and service-access installs, see Bollard Installation Bend. For application-specific use, see Bollards for Fire Lane Protection.
Removable bollard sleeve installation is a precision concrete operation -- the sleeve must finish flush, drain properly, and align with adjacent bollards. Cojo specs and installs removable bollards across Oregon for fire-lane access, service-lane control, and event-perimeter applications. Contact Cojo for a site-specific install quote.
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