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
In a colar beam roof

There is a horizontal tie at almost the middle of rafters only
There is a horizontal tie at the feet of rafters only
There is no horizontal tie beam
There are two horizontal ties, one at the feet and other at the middle of the rafters

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