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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Building Construction
During percussion drilling

The soil to a considerable depth below the bottom of the hole gets disturbed
All listed here
Caving or mixing of strata are caused in soft soils or cohesion-less soils
Ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole

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