Spacing between reference axis and pedestal 1 mm/ M or + /- 5mm
( Reference axis is the line which is centre line some times calls as Boiler axis. It is transferred from
the Bench Mark having marked latitude , longitude and elevation. This point is transferred column
number 13 and 17 . )
Spacing between two foundations ( adjacent) 1 mm / M or + /- 5 mm
Spacing between first row and last row foundation 1 mm / M or +/- 15 mm
Diagonals between foundations 1 mm / M or +/- 10 mm
( this is most important measurement )
Pitch difference between two foundation bolts + / - 3 mm
Diagonal difference between foundation bolts + / - 5 mm
(All foundations are having template made OF steel plates with holes pitched as per drawings .
Bolts are placed there and bottom channel has been locked . The bolts cannot be moved during
casting of foundations . This checks has to be carried out before casting of columns.)
The above picture shows that Boiler column erection has started . Formation of Box between Main
column and Auxiliary Column is under progress. Some of the manufacturer columns are joined by
HSFG Bolts . In this picture main column is bolted but auxiliary columns are welded and also bolted.
The above picture shows boiler erection ( structural) is under progress. Loose columns are tied with
Guy rope . End of the Guy rope is either terminated to max puller or a hand winch . Both the cases
the equipment is securely anchored.
Most of the foreign manufacturer supplies material tier wise so that this type of erection is not
done . This type of erection is having safety issues and can be termed as unsafe . But due to
non sequential material such erection was carried out.
250 MT crawler crane assembly is going on.
LINK 1 - PLEASE CLICK HERE
No comments:
Post a Comment