Building Construction
Engineering news formula for obtaining safe bearing capacity of pile for drop hammer, is,

Q = Wh/6 (S + 2.5)
Q = (W × 6)/h (S + 2.5)
Q = (W × 2.5)/6 (S + h)
Q = Wh/2.5 (S + 6)

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

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

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