oceanobob
Senior Member
This project is started and here are some pics. The basic idea is a 6x6 HSS is installed in a 24" diameter drilled hole that is about six and a half feet deep. A rebar cage at 18" OD with 8 #5s gr 60 and stirrups encircles the HSS. HSS is to be chaired on an 8" dobie. After the HSS is concreted, the interior of the HSS is to be grouted. Then field welding caps to hold the steel rafters (W12s) which in turn support the Z purlins and 12"oc ribbed steel sheathing metal.
I have often read write ups and pics of folks with wood posts for builidngs shops etc - this is how this process worked out with steel columns.
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The holes in the paving (some concrete, some asphalt) were saw cut & breakered out w the mini ex and a plywood disc at 24" was made as a gage to help assure the hand dug pilot holes would be on center and thereby guiding the drill as accurately as possible.
A one ton bag held just the Class II road base found below the paving; the cleanup bucket on the reachlift hauled away a yard or so of sandy with fines soil from the pilot hole.
The dobies to support the HSS were spec'd as 8". These were made with CMU half blocks and grouted with a mix of CSA cement - not portland - which has essentially no shrinkage. Caps with a twisted wire were inserted to allow subsequent placement into the drilled hole.
The auger was on a compact track loader and the cleanup bucket for the reachlift was inserted under the raised auger to catch the spoils. Around ten yards total for these eight columns.
I have often read write ups and pics of folks with wood posts for builidngs shops etc - this is how this process worked out with steel columns.
~~~
The holes in the paving (some concrete, some asphalt) were saw cut & breakered out w the mini ex and a plywood disc at 24" was made as a gage to help assure the hand dug pilot holes would be on center and thereby guiding the drill as accurately as possible.
A one ton bag held just the Class II road base found below the paving; the cleanup bucket on the reachlift hauled away a yard or so of sandy with fines soil from the pilot hole.
The dobies to support the HSS were spec'd as 8". These were made with CMU half blocks and grouted with a mix of CSA cement - not portland - which has essentially no shrinkage. Caps with a twisted wire were inserted to allow subsequent placement into the drilled hole.
The auger was on a compact track loader and the cleanup bucket for the reachlift was inserted under the raised auger to catch the spoils. Around ten yards total for these eight columns.