How to safety stand on your core drill rig.

This is a updated post from one of our older websites in Charlotte, NC.

(Disclaimer ) These following methods are definely non standard, and possibility dangerous to attempt or implement at any level of experience. When core drilling any slab, sidewalk or floor if possible always use built in safety measures as stated in the manual that accompanied the rig and drill motor when purchsed or rented. Use this advice only if you are an experienced core drill operator, and then only at your own risk.

What if I can not use a traditional way to anchor or vaccum base my core drill rig and base plaste to the concrete?

If you are a core drill operator for very long you are going to find out that every job, though simular in alot of cases, is different in many others. Sometimes in a days work you may be asked not to attach a concrete anchor into the floor or get vaccum on the floor to suck the core drill base to the floor for various raseons. We have found that more often than not our task that day will include areas we have to free style drill the core drill hole. It is always best to have a plan and a well layed out method for doing free style drilling and the picture above best demostrates the way to accomplish this. Never actually stand on your core drill rigs base when drilling. Always prepare to have a finger on the power switch to immediately cut the power off. It does not take but a second for the rig to suddenly spin faster than you can react. In a perfect world the vacuum base attached to the core drill rig would suck the core drill down tight every where you needed to core drill a concrete hole. But it don't and won't in every situation. If the concrete is smooth and revetively flat the vacuum base will suck down to the concrete surface and hold the drill perfectly still and rigid while you drill the hole. But often this is not the case. Some simple and usually easy items to find to fix this problem may be mud. Mud can be used to pack around the bottom of the core drill base where the rubber gasket could be losing vacuum. This trick works good where line breaks are in the concrete.Otherwise you may be in an area trying to core drill where the vacuum base just won't work.If this is the case you can remove the vacuum base altogether and use a 4 to 5 inch concrete wedge anchor, or even a 1/4 inch x 4 inch masonary screw, to hold the core drill rig in place while you core drill. Tools for this task would be a hammer drill, hammer, wedge anchor and socket set or crescent wrench to tighten the anchor down. If you are planning to remove the wedge anchor after you have drilled a grinder may be needed too. This method works great where you can not get vacuum to the concrete.But wait. What if you can't get vacuum and can for some reason use a wedge anchor to fasten the core drill down? Well...Stand on it. Or better yet, NEXT to it. This is probably breaking the #1 rule that is posted on each core drill when sold new and definably in the core drilling manual. But at time it is the only thing that will really work. Of course when even breaking the rules there are some basic's you should pay attention to. Especially if you are core drilling on a balcony or dangerous place.

Some simple rules to follow.

• A ) Always stand to the left of the drill. The Core drill motor spins the core drill bit clockwise. If the core drill bit gets hung up for some reason the core drill rig will always spin to your right side.
• B ) Position the power cord tight to the left under your boot so that if the core drill does spin the power will disconnect itself and stop the drill from turning. For this reason don't use locking electrical plugs ONLY. If you are able use electrical adapters that will let the power cord totally disconnect from the core drill power box or motor if the drill starts to spin away from your very stout left foot on the power cord.
• C ) Do Not apply too much pressure while free styling it and let the base of the rig rise up in front. Easy does it.
• D ) Do not try this with core drill motors that are rated over 15 amps. Well I had to say it anyhow. 15 amp motors are usually for drilling 3 inch and smaller holes in concrete. 20 amp motors for 3 inch and above. So it is harder to stop a 20 amp machine that can bore a 12 inch hole becasue of the additional horsepower needed to turn the weight of the bit.
• E ) Do not ever actually stand on your core drill rig, stand beside it.

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You haven't found another site that just wants to list an array of useless information about core drilling in Charlotte NC to get website visitors. You want a core drilling company that can core drill holes in reinforced concrete walls and floors for any type of hole you need core drilled.

We are the core drilling company that your looking for!

We specialize exclusively in core drilling reinforced concrete walls and floors in Charlotte, NC. We offer core drilling sizes from 1-inch to 14-inches in hole diameter and depths from 6-inches to 36-inches in depth or thickness. We service the areas of central North Carolina. Including the grand Queen City of Charlotte.

Today we got to do some crossover work and show our creative side as we core drilled some 5-inch holes in concrete so that a new flamboyant and stylish swing that has been installed at 631 Jackson St. in Charlotte, NC. Not that we are not already artists in our own right. This particular project made us proud to be able to work with different people who take the time to appreciate the crafter side of life in their work.

This has become one of our most popular photos.

It was pleasure to core drill this project. The passingbyers has plenty of good cheer to spread with the wonderful park addition to their local nature trail near downtown Charlotte, NC.

keeping

the core drill bit sharp and cutting at top efficiency is an enormous responsibility of any core drill operator who has the goal of cutting as many holes in a workday as possible when the opportunity presents itself. One of the things about core drilling holes in concrete for a living is that usually, you are not on any 1 job site for very long. A well-outfitted core drilling truck and crew can accomplish miracles for contractors in getting work done quickly if there are 40 holes to be done or less. So when the chance comes along to act like regular workers, by which I mean to the work at the same place, use the same tools and park in the same spot for more than a week then it is a special time indeed. I like to test our mettle and see at what extremes we can get a job, no matter the size, completed. So when a core drilling job came over the wire with over 500 two-inch holes in a concrete floor to be done. I had to jump on it.

Time spent between holes is cruicial

the average time to core drill a 2-inch hole into a reinforced concrete floor can vary depending on the material that is being core drilled, of course, the depth, mounting, and other considerations while putting holes in a concrete floor. Our average time on this job was 97 seconds between the start of one core drill hole and the next. That of course 2 core drilling machines running at top speed and moving as fast as one can while safely performing the work. But alas we only kept up this pace for a short period as there were other considerations such as limited power and water supply. Can every core drilling company core drill this fast. Most likely if they wanted to, they could. well maybe, or maybe not. But we can. But in truth that is showing off. Something we like to call job site performance.

Every job site is different in construction. One of many things we need to operate the machines is water. Water cools the core drill bit and produces slurry, which is a byproduct of the core drilling process. Sometimes there is water on the site, while more often than not water can not be found for more than 500 yards away from where we need it. This was the case on this job so to solve the problem we bought a 275-gallon water tank (fig-b) from a local water tank dealer ( yes, there is such a thing. thank goodness he lives nearby), that had the unique feature of being able to be forklifted to and fro to where it was needed on the job site to provide water for the core drilling. Adding a three-quarter house power water pump and two 100 foot lengths of water hoses and we had water for both machines to operate.

Extracting anchors byway of core drilling

So why was this work being done? Why core drill over 500 holes into a concrete floor. To extract half-inch by 5-inch long concrete sleeve anchors that had used to hold an older style packaging rack system in place for a shipping company near Kannapolis, NC. The racks were being replaced with a new robotic automatic racking system that would speed up the production of getting products out to the trucks that are delivering products to the stores and our happy homes. After the holes were drilled each day we refilled them with anchoring cement like we use to mud-in handrails on our railing projects. Essentially we were taking out the bolts and filling the hole back in. Speaking of being in the Army. Just one of the many ways core drilling is used to accomplish objectives in this world that you might not have thought of. So is the life of a core drill operator.

Core drilling through concrete walls and floors

It seems to be a windy fall this last half of November into December of this miserable year. Pandemics, scam-a-demics, terror-a-demics, they are all amuck as Christmas rolls upon us this blessed year.

Luckily we are too busy core drilling to take part in any of that as two jobs this early winter has us coring 6-inch holes for dryer vents into some places that dryer vents don't normally go.

In fig-1, and fig-3 is shown the holes after they were cored both from the top and from the side to effectively make a ninety-degree corner that a plumber could fit some 3-inch PVC pipes into so that he could make an exhaust for a dryer vent. Unlike most dryer exhausts these were made to go out of the building through the foundation. As you can see there was quite a bit of water that was used to cool the core drill bit as it cut the concrete. These types of core drilling jobs are not like what you find during a course at your local tech school of construction. These foundation walls were uneven, low to the ground and already filled with water when we arrived. But we had been in tough situations before and with a few wooden wedges, a level, and some clever hammer drilling to anchor the core drill rig to the wall we soon had the holes drilled.

Coring concrete foundations

fig-2 is a picture of a small job on Fairview Rd, Charlotte, NC, right before you cross Park Rd when going past the South Park Mall on Sharon Rd. This is another 6-inch core drill hole for where another plumber needed to make a connection from the new home being built to the city's main sewer lines. As you can see it is full of water like a lot of foundation core drilling is. Again we did not have time to take a picture until after we had finished the job but we got one nonetheless. Fig-4 is a look at our new core drilling Ford f-350, magnum V-8 work truck that we have outfitted especially to take care of the toughest core drilling projects in North Carolina. Over 9000 starting watts, 50 gallons of water, 50 core drill bits, 3 core drill motors, and 3 rigs and core drilling stands, this truck is packed to hunt the bear of concrete walls or floors. Quickly accomplishing any core drilling need a customer may have. Retractable water hoses and electric reels make setup and teardown a breeze with any task that is within 100 ln. ft of this beast. With the ability to pump water as high as 40 ft vertically and 180 ft on grade. But back to our subject most core drilling for dryer vents is a minimum of 4 and a half inches to let a 4-inch piece metal dryer vent pass through a wall with just enough room left to apply water sealant around the outside to set it in place. It was because the plumber needed to have the pipe turn at a sharp 90 that the holes were drilled at 6-inches. This allowed two 3-inch pieces of PVC pipe to be joined with a 90-degree elbow inside the hole where the horizontal and the vertical cores met. A technic used by many commercial trades to make junctions inside walls and floors to make pipe go a different way when obstacles appear.