Building Construction
The term string is used for

A vertical member between two treads
A sloping member which supports the steps in a stair
Outer projecting edge of a tread
The underside of a stair

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Building Construction
Auger boring

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

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Building Construction
During percussion drilling

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

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Building Construction
Raft foundations are used for:

All listed here
Counter acting the hydrostatic effect
Providing increased area of foundation over poor bearing capacity of soil
Spanning over small soft or loose pockets

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