sink holes around a sea wall

Discussion in 'Lawn Mowing' started by Stonewall, Jun 9, 2001.

  1. Stonewall

    Stonewall LawnSite Senior Member
    Messages: 280

    I have a client that has a lot on a lake with a concrete sea wall on the lake. There are some sizeable sink holes at the sea wall, one is 4 x 4 and not sure how deep it is. It's filled with water right now. What's the best way to fill these in? How do you estimate a job like this?

  2. WE Chapps

    WE Chapps Sponsor
    Messages: 91

    Sink holes like that are generally formed by the sand getting sucked out from under the seawall or thru some type of break there. We have used a cloth similar to what you would use in mulch beds to prevent weeds from growing that is specifically designed for seawalls. You have to get the water out the best you can and lay the cloth against the seawall and then begin backfilling with sand. You can use rocks to hold the cloth in place while you are adding the dirt back. Be sure the the cloth is covering everthing good or the same thing will happen again.
    On bidding it, you can figure out your yardage easily enough by measuring the size of the holes but the labor part is hard to tell.
    Your customer will be real happy to get this fixed as not only does it look bad it is a danger too.

    Have a good day!
  3. Richard Martin

    Richard Martin LawnSite Fanatic
    Messages: 14,699

    If the hole is small enough (2X2) we fill 'em with concrete to within 12" of the top and then top it off with top soil.
  4. Freetime

    Freetime LawnSite Member
    Messages: 112

    Try cement in bags, buy one or two pallets (40/80 bags) put in holes bag and all, then fill the rest of the way with soil, seed or sod and make your customer happy. You may want to drain the hole (if possible) to find out how large the leak is and take one or two bags and put on the leak then line the bottom of the hole with bags plus one more level then dirt.

    The paper will hold the cement in long enough for the water to set it up.

    Just an idea hope it helped?
  5. Stonewall

    Stonewall LawnSite Senior Member
    Messages: 280


    Do you have a name for the sea wall cloth?

  6. paul

    paul Lawnsite Addict
    Messages: 1,625

    Unless you find why it's sinking it will keep sinking. You have to dig down to the base of the wall and find out if it's undermined or failing. If undermined you might be able to install some rock at the bottom , then fabric. Fill the rest with dirt. This might work but the real problem is in front of the wall, the current is pulling at the toe of the wall. this will cause total loss if not corrected.

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