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Q. Explain types of bearings?
The bearing transfers the forces coming from the superstructure to the substructure. It also allows for necessary movements in the superstructure which are caused by temperature variations. The following types of bearings are generally used.
a) Sliding bearing - permitting rotation and translation
b) Rocker and roller bearings - permitting rotation and translation respectively.
c) Elastomeric bearings - Made of natural or synthetic rubber of shore hardness of approximately 50 to 70. They are very stiff in resisting volume change but are very flexible when subjected to shear. They are generally reinforced with steel plates in alternate layers to reduce bulging. When used with a steel or concrete girder these permit moderate longitudinal movements and small rotations at the ends. These are provided for bridges having RCC or Pre stressed girders and can take deflection a well as movement
d) P.T.F.E. Bearings - The PTFE can be unfilled or filled with glass fibre or other reinforcing material. These are used either to provide rotation by sliding over cylindrical or spherical surfaces or to provide horizontal sliding movement over flat surface or a combination of both. Where there are large displacements accompanied with relatively small loadings, as in case of centrifugal loads, wind loads or seismic loads, PTFE sliding bearings are utilised.
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Q. Lifting of girders? Lifting of girders : For greasing the bearings girders are required to be lifted. But the gap between the bottom flange of plate girders and the bed bloc
• The bar carries equal weights at equal distances from the weight lifter's hands • The reactions (R) at the hands must be equal and opposite to the weights • The pair of for
Explain Designation of bearings. Calculate included angle from bearings
how do i Setting up The total station theodolite?
Why do we need to control air pollution? a. It causes harmful effects on human health, Materials and property, Plants and Animals, Visibility, Global climate and others b.
Q. Illustrate Weld Failures in Track? These are failures occurring to defects in welding the joint. These defects are either because of improper composition of thermit metal or
These are low resistivity conduct
Ask question #Minexaple of wholeiwhole baring 100 words accepted#
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