I'm looking to create a 1x1 square hole in the concrete near my house, right at the top of my driveway, to run an electrical conduit underneath my meter. Since I'm converting my electrical service from overhead to underground, this hole will be crucial for burying the lines from the electrical pole to my home. The utility company will handle most of the work, but the hole is my responsibility.
I currently have an old AEG hammer drill with a hex head bit and a 4.5" angle grinder with a diamond wheel. I'm considering whether to purchase a demolition jackhammer from Vevor or an SDS rotary hammer from Harbor Freight for around $100. My plan is to drill four 1/2-inch pilot holes in the corners, score the area with the diamond wheel, and then break away the middle with a sledgehammer. What do you think of this approach? Is there a better way to go about it, or can I manage with the tools I already have?
3 Answers
I'd actually question if you really need a square hole. If the design allows it, consider boring a larger circular hole instead and then inserting a square conduit within it. This way, it might be easier to cut. As for thickness, any chance you’ve measured it yet? Knowing that could help in selecting the right tools, too.
Instead of just scoring the corners, I suggest drilling multiple holes around the perimeter. The idea is to create rows of holes for better precision. You could rent an SDS rotary hammer with a 2” concrete bit from Home Depot—it’ll make for an easier job. And don't forget to use protective gear like safety glasses and a respirator due to all the dust you'll kick up.
Also, consider using a diamond coring bit to help refine the hole shape after drilling your initial cuts. It can really help with achieving a clean finish!
That makes sense! What do you recommend for breakage once I’ve drilled? Sledgehammer, or is there a better option?
Renting a concrete saw like the Husqvarna Cut-n-Break is a great idea. It'll help you cut a cleaner hole without all the hassle of breaking it apart. Just make sure you're comfortable handling it, as they can be heavy-duty! Plus, it’ll save you some muscle work trying to break the concrete up afterward.
Yeah, I’ve heard that’s a solid tool to use. Just make sure you have someone around to help, or it might get tricky!
That’s a good point! I’m not entirely sure on the thickness yet, but I’ll check when I start. Thanks!