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
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

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Building Construction
Which one of the following activities is not correct as applicable to brick corbels

The maximum projection of each corbel course should be limited to a quarter brick at a time
The discontinuous corbels are used to carry heavy concentrated loads
Stretcher bond is generally used for the construction of brick corbel
The maximum projection of the corbel should not be more than the thickness of the wall

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