How to cut concrete?

Konrad___far_northNovember 13, 2011

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

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brickeyee

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.

    Bookmark   November 13, 2011 at 2:52PM
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Konrad___far_north

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

    Bookmark   November 13, 2011 at 9:11PM
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sierraeast

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

    Bookmark   November 14, 2011 at 10:01AM
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kudzu9

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

    Bookmark   November 14, 2011 at 9:15PM
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Konrad___far_north

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

    Bookmark   November 15, 2011 at 12:00AM
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Konrad___far_north

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

    Bookmark   November 20, 2011 at 11:07PM
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brickeyee

"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.

    Bookmark   November 21, 2011 at 3:53PM
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