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  1. #1
    Scott M. Petty's Avatar
    Scott M. Petty Guest

    Default Help with telescope pier on a patio......



    I'm planning to mount a telescope pier (Astro Pier) on a to be poured
    concrete slab. The slab would be on a slope (although the slab obviously
    would be level) and would vary between 1 and 5 feet in depth, being at least
    4 feet deep under the telescope pier. The overall size of slab would be
    approximately 8 x 13 feet.

    Would NOT isolating the telescope pier from the rest of the slab be a
    problem? If my children or dogs walk on the slab am I going to get all
    sorts of vibration in the mount or is the mass of the slab such that
    vibration shouldn't be a problem?

    Thanks in advance!!!

    Scott

    scott@rivendellfarm.us



  2. #2
    Chris L Peterson's Avatar
    Chris L Peterson Guest

    Default Help with telescope pier on a patio......

    On Sun, 2 Nov 2003 18:35:45 -0500, "Scott M. Petty" <scott@rivendellfarm.us>
    wrote:


    I'd suggest putting the pier into its own footing and pouring the slab around
    that, with a sand gap for isolation. You'd be surprised how much vibration gets
    transmitted by solid concrete. It probably wouldn't be an issue for visual work,
    but if you image, or ever plan on imaging, the vibration will likely be enough
    to cause you no end of headaches.

    _________________________________________________

    Chris L Peterson
    Cloudbait Observatory
    http://www.cloudbait.com

  3. #3
    Mitch Alsup's Avatar
    Mitch Alsup Guest

    Default Help with telescope pier on a patio......

    "Scott M. Petty" <scott@rivendellfarm.us> wrote in message news:<G6GdnVpIaO5PCTiiRVn-tw@giganews.com>...

    The best way to mount a pier is to isolate the pier from the rest of the pad.
    I would suggest that the central pier section be cast separately, and then
    fill in at least a foot between the walking slab and the pier with large
    loosely fitting rocks so that the resulting waling slab is completely
    isolated from the pier itself. As agregate is less expensive than concrete
    thsi may also save money.

    Good luck

  4. #4
    Joe S.'s Avatar
    Joe S. Guest

    Default Help with telescope pier on a patio......

    Is your concrete slab really going to vary from one foot to five feet THICK?
    I must have read your post wrong. 8 x 13 x (1 to 5 feet) is around 10 cubic
    yards of concrete -- that's a lot of concrete. What sort of forms are you
    using?

    Just curious.
    --

    ----
    Joe S.

    "Scott M. Petty" <scott@rivendellfarm.us> wrote in message
    news:G6GdnVpIaO5PCTiiRVn-tw@giganews.com...
    least



  5. #5
    RichardN22's Avatar
    RichardN22 Guest

    Default Help with telescope pier on a patio......

    >Is your concrete slab really going to vary from one foot to five feet THICK?

    He said it was on a hillside....


    Richard Navarrete
    RichardN22@aol.com
    Astrophotography Web Page - http://members.aol.com/richardn22

  6. #6
    WJShaheen's Avatar
    WJShaheen Guest

    Default Help with telescope pier on a patio......

    I think the rationale behind his question about the forms used is that that
    amount of concrete will tend to move down the hill.

    (Spoken from experience by one who has had a form pop loose.)

    Bill in Cave Creek.




  7. #7
    Barry Gloger's Avatar
    Barry Gloger Guest

    Default Help with telescope pier on a patio......

    "Scott M. Petty" <scott@rivendellfarm.us> wrote in message news:<G6GdnVpIaO5PCTiiRVn-tw@giganews.com>...
    I think you're implying that the slope of the hill is 1/2; that is a
    verticle drop of 4' over 8' of ground; quite steep. Such a slope is
    plastic and will tend to flow, especially when wet and supporting the
    weight of a concrete slab.

    Since you want to level the ground, hire a landscaping/patio
    contractor and build a proper retaining wall and fill the hole with
    rock and dirt as he suggests. Then pour a proper slab ( depending on
    your temperature zone and subsoil - you'll probably only need 6" -
    streets are built with 9" concrete and highways with 12") over
    aggregate & sand, isolated from the pier as others have described.
    Expect to pay $100 per cubic yard for the concrete,

  8. #8
    Scott M. Petty's Avatar
    Scott M. Petty Guest

    Default Help with telescope pier on a patio......

    Thanks so much for the responses..

    I'm going to pour the pier first, surround it with a sand buffer, and then
    let a concrete contractor do the rest. As many of you stated, the
    contractor said that a solid slab was NOT the way to go. Instead he'll pour
    a retaining wall, backfill with dirt (and drains), and pour a slab over the
    dirt.

    Thanks again, I sure do love the newsgroups...

    Scott

    "Barry Gloger" <bgloger@nyc.rr.com> wrote in message
    news:f652fe7d.0311040604.2f2c3b8e@posting.google.c om...
    news:<G6GdnVpIaO5PCTiiRVn-tw@giganews.com>...
    obviously
    least



 

 

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