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  1. #1
    Join Date
    Oct 2008
    Location
    Troy MI
    Posts
    400

    Flush Mount I-beam

    I am in the process of building an addition to the back of my garage to enlarge my shop area. The ceiling will require a 16 feet long W12"x16 lb/ft I-beam that will support the joists. The joists will support an attic, which will be used for storage. I chose to mount the I-beam flush with the joists to avoid infringing on the ceiling space in the shop. On the North side the I-beam will be supported by a wooden post. On the South side the I-beam will be supported by a 3" diameter schedule 40 Lally column, which will be located about 2 feet from the south wall of the addition to allow space for furnace ductwork between the Lally column and the south wall. The Lally column will rest on the 6" thick steel reinforced concrete slab. The column load will pass to a 2'x2'x2' pier, which is located under the slab.

    1. The crosshatched area in the first picture shows the floor plan for the new addition.

    2. The second picture is an isometric view which shows the new addition on the left side.

    3. The third picture shows using a magnetic base drill press to drill 9/16" holes in the I-beam for the 1/2" bolts that will fasten the 2x12's to the sides of the I-beam.
    Attached Images Attached Images

    Miller Thunderbolt
    Smith Oxyacetylene Torch
    Miller Dynasty 200DX
    Lincoln SP-250 MIG Welder
    Clausing/Coldchester 15" Lathe
    16" DuAll Saw
    15" Drill Press
    7" x 9" Swivel Head Horizontal Band Saw
    20 Ton Arbor Press
    Bridgeport
    Miller Spectrum 375 Plasma Torch

  2. #2
    Join Date
    Oct 2008
    Location
    Troy MI
    Posts
    400
    I welded a tab to the south end of the I-beam to attach it to the south wall to stabilize it during ******** of the I-beam, I used 0.035" wire with short circuit MIG because the plates were only 3/16". I used Lincoln 71M Outershield fluxcore to weld a 1/2" plate to the north end of the I-beam (330 in/min WFS @ 23 volts). In addition to stabilizing the I-beam, this plate also spreads the load out on the upper 2x6 wooden plate to reduce the compression stress on the wooden upper plate to acceptable levels. I also used 71M wire to weld a tap plate to the bottom of the I-beam to be used to attach the upper end of the Lally column.

    4a, 4b, & 4c Pictures of South tab

    5. North tab

    6. Tap plate welded to bottom of I-beam
    Attached Images Attached Images

    Miller Thunderbolt
    Smith Oxyacetylene Torch
    Miller Dynasty 200DX
    Lincoln SP-250 MIG Welder
    Clausing/Coldchester 15" Lathe
    16" DuAll Saw
    15" Drill Press
    7" x 9" Swivel Head Horizontal Band Saw
    20 Ton Arbor Press
    Bridgeport
    Miller Spectrum 375 Plasma Torch

  3. #3
    Join Date
    Oct 2008
    Location
    Troy MI
    Posts
    400
    I also used 71M wire to weld a plate to the top of the Lally column. Next I used a manual fork lift to erect the I-beam. The North end of the I--beam rested on the North wall. I temporarily supported the South end of the I-beam with an adjustable Lally column to level it.

    7. Plate welded to top of Lally column

    8a & 8b. Using manual fork lift to lift I-beam into position.

    9. Adjustable Lally column
    Attached Images Attached Images

    Miller Thunderbolt
    Smith Oxyacetylene Torch
    Miller Dynasty 200DX
    Lincoln SP-250 MIG Welder
    Clausing/Coldchester 15" Lathe
    16" DuAll Saw
    15" Drill Press
    7" x 9" Swivel Head Horizontal Band Saw
    20 Ton Arbor Press
    Bridgeport
    Miller Spectrum 375 Plasma Torch

  4. #4
    Join Date
    Oct 2008
    Location
    Troy MI
    Posts
    400
    I screwed the plate, which was welded to the top of the of the Lally column to the tap plate,which was welded to the bottom of the I-beam and let it hang free. Next I attached a 1/2" plate to the concrete directly below the I-beam using Tapcon fasteners. Finally I TIG welded the new plate to the bottom of the Lally column. I had to TIG weld it because my 71M outer shield had absorbed moisture due to the high humidity so I was starting to get worm tracks in the weld. The last step is to use hanger brackets to attach the joists to the 2x12, which are bolted to the I-beam.

    10. Plate welded to bottom of Lally column

    11. Lally column mounted

    12. Hanger brackets installed

    13. Status of addition
    Attached Images Attached Images

    Miller Thunderbolt
    Smith Oxyacetylene Torch
    Miller Dynasty 200DX
    Lincoln SP-250 MIG Welder
    Clausing/Coldchester 15" Lathe
    16" DuAll Saw
    15" Drill Press
    7" x 9" Swivel Head Horizontal Band Saw
    20 Ton Arbor Press
    Bridgeport
    Miller Spectrum 375 Plasma Torch

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