Just one of the huge obstacles with an installation is having a job that deals with concrete. Putting onto concrete will involve core-drilling the holes into your concrete base and setting the posts with a super fast set grout. Considering this involves drilling into concrete, it can be more unsafe than simply attaching to a timber deck. A choice here is to have your fence line marked out, the position of where each post or spigot (mini-post) also marked clearly and then to get the services of a concrete cutter. This would remove the need to hire or buy an expensive concrete core-drill and most concrete cutting/drilling companies will normally give you a cost per hole that you want cut.
Core-drilling Tips for Concrete
Protection is always very important! So if you do make a decision to drill the holes yourself please keep the following pointers in mind:
- Always ensure your core-drill is safe to use mechanically and has no ruptures or splits in the electrical cord.
- If using the hand-held range make certain that the cable will not be twisted around any part of your body or nearby constructions.
- If using the portable machine version with a pedestal, ensure the area around the drill body is clear of any clutter and or other building products.
- * Important * Always guarantee that the core drill bit is vertical and that it can run down the full depth of the hole without going to one edge. This is crucial because if the drill piece does go slightly off the vertical axis it will snag on the edge of the hole and hurl the drill. This can cause major injuries to the operator.
- Well before drilling ensure there is adequate supply of water to the drill and the water is turned on, not only at the tap but on the core drill tool too.
- When drilling, keep the down resistance up to the drill. If there is inadequate pressure applied, the drill bit will not cut downward, if there is way too much force applied then the core-drill bit may cut a bit quicker but the bit will lose its edge promptly and not last.
- After the core has been drilled and you have a round opening into the concrete, the core can be removed sometimes with a mild tap with a metal hammer on a slight angle. If it doesn’t come loose with this then try to edge a small cold chisel into the gap and delicately tap it so to not ruin the concrete or tiles, or whatever your surface is.
- Some concrete will have steel reinforcement embeded in the concrete and this may be grabbing as you attempt to remove the core. It is best to gradually increase the force of your tapping with the cold chisel up until it comes loose. This will ensure that there is no collateral damage to the encircling floor.
- After the core has come loose from the bottom then you can simply lift it out. If you can’t get a sufficient grip then would recommend using a pair of metal kitchen tongs to grab the edges of the core. If it still doesn’t want to come out then it is probably that it is still fastened by some reinforcing steel. Complete the drilling procedure in the same hole.