Extending existing steel beam.

27 Sep 2020
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United Kingdom
I have to remove a brick pillar extend an existing steel beam by 150mm to the inner leaf of a cavity wall. (Current beam 178x60mm PFC) I've been advised by an engineer to to stitch a new 700mm long 125x65x15mm PFC to the inside of the existing using x4 M12 8.8 high tensile steel bolts or if I want for peace of mind use x 4 M12 10.9 high tensile steel bolts and use a 450x150x100mm padstone. Would this be ok? The other side is resting on a brick pillar.
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Structural work requires building regs and they would want a copy of the structural engineers notes on the beam for their file.
Grade 8.8 is the usual standard and would be fine.
More importantly, has the SE given you the bolt spacing?
Yeah, minimum 50mm from edge of existing. Then 140mm triangulated/ pyramid spacing. Using M12 60mm 10.9 high tensile. I always over engineer...
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