How to Install a Bolt-Down Steel Bollard — Step-by-Step Guide for South African Properties

You've chosen your bollards, they've arrived on site, and now they need to go in. Bolt-down installation is the most common method for fitting steel bollards in South Africa — it works on any existing concrete surface, doesn't require digging, and a two-person team can fit 10 to 15 bollards in a single day.

This guide walks through the entire process step by step, from the tools you'll need to the torque settings that keep everything secure. Whether you're a contractor fitting out a car park or a property owner installing a few bollards on your driveway, the method is the same.

Before You Start: Check Your Concrete

Bolt-down bollards rely entirely on the concrete beneath them for strength. Before you drill a single hole, check two things:

Concrete thickness — the slab must be at least 150mm (6 inches) deep. Anything thinner won't hold the anchor bolts under impact. If you're unsure, a small core sample or a check with a ground-penetrating scanner will confirm.

Surface condition — the concrete should be sound, with no cracks within 300mm of where the bollard will sit. Cracked or spalling concrete can't hold an anchor reliably. If the surface is asphalt rather than concrete, you'll need to cut through the asphalt and cast a concrete pad first — asphalt alone doesn't provide enough holding strength for anchor bolts.

Also check for buried services. Use a cable and pipe locator to scan the area before drilling — hitting a water pipe or electrical conduit is expensive and dangerous.

Tools and Equipment You'll Need

Having everything on hand before you start saves time and repeat trips. Here's the full toolkit:

• Rotary hammer drill (SDS-Plus or SDS-Max)
• Masonry drill bits (12mm and 16mm, depending on anchor size)
• Torque wrench (range covering 60–140 Nm)
• Spirit level (600mm minimum)
• Tape measure and chalk or marker
• Wire brush and compressed air (for cleaning drilled holes)
• Spanners or socket set
• Safety gear: ear protection, safety glasses, dust mask, gloves

For larger installations, a generator may be needed if mains power isn't available on site.

Expansion Anchors vs Chemical Anchors: Which to Use

Both anchor types work for bollard installation, but they suit different situations.

Expansion anchors (wedge anchors) are the faster option. You drill the hole, drop the anchor in, and tighten the nut — the wedge at the bottom expands against the sides of the hole and locks it in place. They work well in sound, un-cracked concrete of at least 150mm depth. Typical torque: 60 to 80 Nm for an M12 wedge anchor.

Chemical anchors (resin anchors) use a two-part epoxy resin injected into the drilled hole. You insert a threaded stud into the resin and allow it to cure before fitting the bollard. Chemical anchors provide a stronger bond, distribute load more evenly, and work better in older or slightly compromised concrete. They also perform well close to slab edges where expansion anchors might crack the concrete. The trade-off is curing time — typically 20 to 30 minutes at normal temperatures, and up to 60 minutes in cold weather (below 10°C).

Which should you choose? For new, thick, sound concrete — expansion anchors are quicker and perfectly adequate. For older concrete, thinner slabs, or positions near edges and corners — chemical anchors are the safer choice.

Step-by-Step Installation

1. Mark the position. Position the bollard on the concrete exactly where you want it. Use a tape measure to check spacing from adjacent bollards or structures. Once positioned, use chalk or a marker to trace around the base plate and mark the centre of each bolt hole.
2. Drill the anchor holes. Move the bollard aside. Using your rotary hammer drill with the correct masonry bit (typically 12mm or 16mm), drill each hole to the depth specified for your anchor type. Keep the drill perpendicular to the surface — angled holes weaken the anchor's pull-out strength.
3. Clean every hole thoroughly. This step is critical. Use a wire brush to scrub the inside walls of each hole, then blow out all dust with compressed air. Repeat twice. Drill dust left in the hole prevents both expansion anchors and chemical resin from bonding properly to the concrete.
4. Install the anchors. For expansion anchors: drop the anchor into the hole and tap it flush with a hammer, then tighten the nut to expand the wedge. For chemical anchors: inject resin from the bottom of the hole upward, filling it about two-thirds full. Insert the threaded stud with a slight twisting motion and allow the resin to cure fully before proceeding — do not rush this step.
5. Place the bollard. Lower the bollard over the anchor studs, aligning the base plate holes with each bolt. If the surface isn't perfectly level, use stainless steel shims under the base plate to eliminate any rocking.
6. Check vertical alignment. Place a spirit level against two adjacent sides of the bollard and adjust until it reads plumb in both directions. A visibly leaning bollard looks unprofessional and can affect its performance under impact.
7. Secure and torque the fixings. Fit a washer and lock nut onto each stud. Hand-tighten first, then use a torque wrench to tighten in a cross pattern (1–3–2–4 for a four-bolt pattern). This distributes clamping force evenly. Typical torque: 80 to 100 Nm for M12 bolts, 120 to 140 Nm for M16 bolts.
8. Final check. Apply hand pressure to the bollard from several directions. There should be zero movement. Come back after 24 hours and re-check the torque on every nut — concrete settlement and temperature changes can cause slight loosening on new installations.

Common Installation Mistakes to Avoid

These are the errors that cause bollards to fail prematurely or look wrong on site:

Skipping the hole cleaning — the single most common cause of anchor failure. A dusty hole can reduce anchor holding strength by 50% or more.

Drilling into rebar — striking reinforcing steel weakens both the slab and the anchor. Use a rebar detector before you drill, and relocate the hole if needed.

Over-tightening — cranking the nuts past the specified torque can shear the bolt or crack the concrete around the anchor. Always use a torque wrench, not a breaker bar.

Installing on asphalt — asphalt is too soft and flexible to hold anchor bolts under any serious load. If your surface is asphalt, you need a concrete pad underneath.

Not checking plumb — a bollard that leans 5° off vertical is obvious to anyone who walks past. Two quick checks with a spirit level take 30 seconds and make the difference between professional and sloppy.

Rushing the resin cure — loading a chemical anchor before the resin has fully cured can pull the stud out of the hole. Follow the resin manufacturer's cure time exactly, and add extra time in cold weather.

Need Bollards for Your Next Project?

Browse Archeva's full range of bolt-down steel bollards, available in square and round profiles, fixed and fold-down models. All manufactured in South Africa from quality mild steel with hot-dip galvanised finish options.

Not sure which size or type suits your site? Contact us for advice, installation guidance, or a bulk quote.