Yes, you can absolutely bolt a street bench directly into concrete, and in many cases, this is the preferred method for permanent installations. However, there are a few critical considerations to ensure the bench stays stable and secure over time.
First, you don't necessarily need a separate "special base" if the concrete surface is solid, level, and thick enough (typically at least 4 inches thick for most benches). The key is to use the right hardware: stainless steel or galvanized expansion anchors (also called wedge anchors) or sleeve anchors that are designed for concrete drilling. Regular screws or weak plugs won't cut it.
Before drilling, check if the bench has pre-drilled mounting holes or metal base plates. Most commercial-grade street benches come with base plates that are ready to bolt down. If yours doesn't, you may need to attach a base plate first—that plate acts as the "special base" to spread the load and prevent the bench from wobbling.
Another factor is corrosion. Since the bench will live outdoors, choose anchors made of stainless steel or hot-dipped galvanized steel to resist rust. Also, seal the drilled holes with a small amount of silicone or anchor adhesive to keep moisture from seeping into the concrete, which can cause cracking or loosening over time.
Finally, always follow the manufacturer’s instructions if available. Some benches are designed to be anchored directly, while others may recommend a surface-mount plate or a concrete-embedded sleeve. If your bench is heavy (steel or concrete), I would also suggest using larger anchors (e.g., 1/2-inch diameter) and adding a washer and lock nut for extra security.
To sum it up: yes, direct bolting into concrete works perfectly, but you need proper expansion anchors, a solid base plate if the bench lacks one, and corrosion-resistant materials. If the concrete is too thin or questionable, pour a thicker pad or use a portable base.