Building Construction
Raft foundations are used for:

Spanning over small soft or loose pockets
Providing increased area of foundation over poor bearing capacity of soil
Counter acting the hydrostatic effect
All listed here

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

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