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Re: Gantry Crane Rail Blockout

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Paul and Daryl et al,
I haven't said anything because every job is special and my solution may not be appropriate. Given what Daryl said below, I designed a flat plate bolted to a concrete slab on grade to minimize tripping and allow cross trafffic by fork lifts. The customer also wanted a dirt free rail. I used a 1/2" or 5/8" plate(memory fails me here) bolted with expansion bolts with countersunk heads. As I designed the gantry, I chose a large diameter and width, special plastic (nylon?) wheel. Havent had any feed-back after approx 15 years. Sorry abt the vagueness, but I designed it, but it was drawn by my customer.

Daryl Richardson wrote:
You haven't indicated why you need a block-out. I'm speculating that you want to avoid a tripping hazard or provide some type of cross rail access for a vehicle or a dolly or some other wheeled transporter. If you can use the solid bar rail you can probably use a channel cast into the floor toes up (either a C or an MC shape) according to the depth you require. I'm sorry; I don't have a detail for a larger cast crane block-out. Hope this is helpful. Regards, H. Daryl Richardson

    ----- Original Message -----
    *From:* Paul Blomberg <mailto:paul.blomberg(--nospam--at)>
    *To:* seaint <mailto:seaint(--nospam--at)>
    *Sent:* Wednesday, April 18, 2007 4:56 PM
    *Subject:* Gantry Crane Rail Blockout

    I've got a client that wants to incorporate a 'future' 20 ton
    gantry crane into their manufacturing facility.  I was envisioning
    a block out in the slab on ground that is removed and the rail set
    in the block out, leveled, plumbed and polyurethane fill cast
    around the rail to set it in place.  This detail is used locally
    as part of the light rail commuter transit system.
Others in my office are voting for an embedded plate in the bottom
    of the block out with the rail ultimately welded to the embed
    plate.  My concern with this approach is alignment and elevation
    tolerance.  I know from experience that embedded plates don't get
    the same close tolerances that a rail support needs.  Also, with
    the future installation of the rail and crane, the General
    Contractor may not meet the strict tolerances for the rail and the
    owner might suffer later during rail installation.
As another alternative I was thinking that I could use rail clamps
    and concrete anchors and shim to the proper elevation.  I'm
looking for your input and alternatives. Additionally, does anyone ever provide drainage in the annulus
    next to the rail.  This gantry crane travels from outside the
    building into the building.
Your thoughts are appreciated. Paul.

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