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MONTHYEARML21288A4302021-10-18018 October 2021
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2021-10-18
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Interview with Gary Goetsch, PSC supervisor over tendon detensioning October 24, 2009 Marci Cooper and Craig Miller
" What was done and sequence? -
o De-tensioned 2 vertical top center - night shift performed per plan o Absolutely no sequence for the plasma cuts o He had asked Mr. Peters (Bechtel) when came on job what sequence to be used -was told no sequence per plan, any sequence was ok to cut o Started plasma cutting with 3 crews - 1 on vertical, 1 on B2-4, 1 on B3-5
" What was observed or noted?
o Was very smooth cut - by that means that are relieving 1.2-1.4 million lbs.
each. The cuts and self-relieving very smooth, because shims still in place/tight behind grease cans so unloaded evenly - if not, they would have slipped out.
o When asked if some tendons did not self-relieve as cutting, he said he didn't recall or know - did not have machine cut effect or wouldn't still have shims tight o When asked what he normally sees, he indicated could be either way, i.e., start cutting and subsequent tendons self-relieve as pick up more load, or some don't and cut. Either way can be smooth
- How many jobs like this has he done and what was similar or different in other experiences?
o This is 11th SGRjob o This is the first and only one where did this way - no sequence to cutting and not de-tensioning some tendons outside the cut area before cutting concrete o Usually, cut within the opening per specified sequence - e.g., cut one, skip two, cut one, skip two, go up and then alternate back down o Then after all done in the opening, detension around the opening, e.g., 5 -10 on either side and above/below, before cut containment o Knew (the CR-3 plan) was a bad idea o S&L did some model that said would take the load o He was told the reason for doing this way at CR-3 was to maintain the use of the polar crane o His concern would be stress loads around concrete
" What was duration of cutting activity?
o Cut from one end of platform, pull tendon out other; then start on next.
Except for verticals, no platform changes. Cut straight across
" Roughly 1 to 2 tendons per shift, roughly 4 days to complete - finished around 10/1 (coiled), last cut on 9/30
- Some reports that others detension in opening before cut - how does that match with your experience?
o Have to cut under tension if plasma cut. Otherwise would relax.. .would have to probably grind, would take days and days to cut. Just from schedule standpoint would not do o Others plasma cut under tension
