Building Construction
The depth of an arch is the distance between

Ground level and springing line
Crown and ground level
Intrados and extrados
Crown and springing line

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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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Building Construction
Auger boring

All of these
Is the most primitive method for making a hole in the ground
Is most economical up-to a depth of 5 meters
Is generally employed in cohesive and other self soils above water table

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