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Q. Explain Forty-five degree spread rule for driven piles ?
For driven piles the length of piles driven into the ground is generally based on dynamic driving formula such as Hiley's formula. In certain ground (for example chalk) the length of piles driven by adopting pile-driving formulas can be far more than adequate since the soil strength may increase with time. In contrast, in silty soils phenomenon of false set can appear and the piles give a false impression of attaining sufficient bearing resistance from the ground. Henceforth the pile's capacity must be verified and checked later by loading test.
In case driven piles are founded on different depths below ground, 45-degree spread rule is generally applied to check their load carrying capacities. The base bearing loads of higher driven piles are presumed to spread at 45 degrees from their bases and checking is made if loads from higher piles would influence or get transmitted to deeper ones.
In construction of a two-span bridge (span length = L) by using span-by-span construction, why is the length of about 1.25L bridge segment is constructed in first phase of construc
A pre- engineering base line was run down a very steep hill.rather than measure horizontaily down hill with steel tape: surveyor measured the vertical angle with the theodolite and
Define Influence lines Provides information at a single point on a beam Can be used for: - Reactions - Internal shear forces - Internal moment Indicate
purpose
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Design a footing of a bridge pier
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One pump lifts storm water from a storage tunnel wet well a constant vertical distance of 150 ft. The equivalent length Le of the 14 in diameter piping is 1,000 ft. Pressure drop d
what is flush joint and confined joint in rcc spun pipes?
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