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How to cut concrete?

Posted by konrad___far_north (My Page) on
Sun, Nov 13, 11 at 13:03

I need to cut about 6 feet in length and about 3 to 4 inch thick in vertical position into a septic tank... making a door entrance for the root cellar.

Have no power, I'm thinking by hand with chisel, or hire somebody with diamond saw. If I chisel by hand, then I can make a nice U cut, curve on top for better strength of door, not dealing with sharp corner. Then I need to extend door by about 4 feet, side concrete wall with roof, tie into the tank with rebar. I guess heaving square corners would work too if I tie rebars into it? This would make it easier pouring the roof.
About 4 feet of soil will go on top and sides, the door extension will give me a second door.
Please advise


Follow-Up Postings:

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RE: How to cut concrete?

If you do not want to rent/buy/borrow a generator use a star drill to roughly outline the opening and then start to work with a chisel and drilling hammer.

An impact drill and some carbide bits would make shorter work of a large number of holes, reducing the chisel work needed.


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RE: How to cut concrete?

Thank you so much Brickeyee!
Some good hints here,...think I should invest in a generator, can you recommend any?


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RE: How to cut concrete?

Or you can rent one of these along with the drilling advise given for the corners and the bottom where the saw can't get to.

Here is a link that might be useful: saw


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RE: How to cut concrete?

i have used the chisel and drilling hammer approach when I was younger and it works well, but it can make for a long day. At this point in life, I value my time more, so a gas-powered rental saw would be my tool of choice, particularly if I knew I would encounter rebar. Below is a link to an article on cutting concrete which has some interesting observations.

Here is a link that might be useful: Cutting concrete


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RE: How to cut concrete?

Thank you all!
I will take a visit to the rental and see.


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RE: How to cut concrete?

Will this unit do for the job, running a hammer drill?
I know...have not much to spare, it should run up to a 10 amp motor.

Here is a link that might be useful: 1200W Generator


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RE: How to cut concrete?

"it should run up to a 10 amp motor."

Motors have a large current draw at start-up, but if you get the drill turning before starting cutting it might handle 8 amps.

most of the generator power ratings are like Sear's "maximum developed horsepower."

A pure fantasy.


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