Building Construction
In grillage foundations a minimum 15 cm cover is provided on

Ends of external beams
Lower beam of lower tier
None to these
Upper flange of top tier

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Building Construction
In the method of tube boring of soil investigation, the following is essential:

A tube of about 2 meters length and 20 cm diameter with a cutting edge
The tube is raised and lowered by 4 thick rope moving over a pulley suspended on a tripod stand
All listed here
A flap valve at the bottom of tube is provided to extract the soil sample

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