Building Construction
In a colar beam roof

There are two horizontal ties, one at the feet and other at the middle of the rafters
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

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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 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
All listed here

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