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.
Gary
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@gmail.com>
> *To:* seaint <mailto:seaint@seaint.org>
> *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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