This set of Construction and Building Materials Multiple Choice Questions & Answers (MCQs) focuses on “Different Types of Pile”.
Explanation: Raymond standard concrete pile consists of thin corrugated shell closed at bottom. The shell is driven into the ground with a collapsible Steel mandrel core in it. When the desired depth is reached, the mandrel is collapsed and withdrawn.
Explanation: Raymond step taper concrete pile consists of Steel sections of suitable length. The bottom of first shell to be driven is closed by a flat steel plate. The diameter of pile increases in steps at the rate of 25 mm for each successive shell section.
Explanation: In Mac Arthur pile, a heavy steel casing with a core is driven into the ground as shown in given figure. When the desired depth is reached, the core is withdrawn and a corrugated steel shell is placed in the casing.
Explanation: Base driven pile consists of a helically welded shell of steel plate. A concrete plug is provided at the bottom of the shell and driving its done by allowing pile Hammer to fall on the concrete plug.
Explanation: In Swage pile, a precast concrete plug of slight conical shape provided at the bottom of a steel shell. These piles are used for hard soil or at places where it is desired to have watertight shell before concrete is placed in the Shell.
Explanation: In Button bottom pile, a concrete button is used at the bottom to provide an enlarged hole in the soil when the file is being driven.
Explanation: In Simplex pile, a Steel Tube fitted with cast iron shoe is driven into the ground up to required depth as shown in above figure. The reinforcement, if necessary, is put up.
Explanation: In Simplex Alligator jaw pile, the cast iron shoe is provided by alligator jaw point. When concrete is poured, the jaw opens and allows concrete to flow. In this type of pile, the shoe does not remain in the ground.
Explanation: In Pedestal pile, a concrete pedestal can be seen at the bottom of the pile which is driven into the ground. The pressure is applied on the concrete through the core and at the same time, the case is withdrawn and hence the concrete is sprayed into the voids.
Explanation: In Pressure pile, the compressed air is then admitted through the air Pipe and which is applied to raise the tube. Thus, the tube is lifted slightly and at the same time, the concrete is forced into the surrounding ground by compressed air.
Explanation: Load bearing piles penetrate through the soft soil and their bottom rest on a hard bed. Thus, they are end bearing piles and act as a column or piers. The soft ground through which the piles pass also give some lateral support and thus increases the load carrying capacity of the bearing piles.
Explanation: When loose soil extends to a great depth, the piles are driven up to such a depth that the frictional resistance developed at the sides of the piles equals the load coming on the piles.
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