Building Construction
Rotary drilling

All listed here
Is not suitable for deposits containing very coarse gravel
Is not economical for holes of less than 10 cm
Hinders the ground water observations and permeability test

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

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
All listed here
A flap valve at the bottom of tube is provided to extract the soil sample

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