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QuestionWhy Poly tetra fluoro ethylene (PTFE) is usually used in sliding bearings? AnswerThe choice of sliding surface of bearings is of very important importance since sliding surfaces generate frictional forces that are exerted on bearings and substructure of bridge. For example, PTFE and lubricated bronze are usually choices of sliding surfaces for bearings. PTFE is fluro carbon polymer which possesses high-quality chemical resistance and be able to function in wide range of temperature. On whole significant characteristic of this material is its low coefficient of friction. PTFE has slightest possible coefficients of static and dynamic friction of any solid with absence of stick-slip movement by David J. Lee. The coefficient of friction is established to decrease with add to in compressive stress. However, PTFE contain some demerits like high thermal development and low compressive strength. In designing complementary contact plate with PTFE sliding surface, stainless steel plates are in general selected where plates have to be larger than PTFE surface to let movement without exposing PTFE. Moreover, it is recommended that stainless steel surface be located on top of PTFE surface to avoid contamination of dirt and rubbish. Lubricants are now and then introduced to decrease friction between PTFE surface and upper stainless steel plate. Hence, PTFE might be designed with dimples to keep away from lubricant from squeezing out under repeated conversion movements.
All soils subjected to stress undergo strain. This will be taking place within the soil skeleton. This strain is caused by rolling, slipping, sliding and crushing at the particle c
We can measure concrete by Cubic feet, Cubic yards, Cubic Meter
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Question Why are transitional jacks designed in pipe jacking projects? Answer While development of pipe jacking stops, building up of confrontation is extremely
A contractor established a policy to purchase equipment over leasing only if the return is a minimum of 15%. Given the following conditions, the contractor's decision based on the
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Compaction to freshly placed concrete piles In general practice, reliance is placed on the self-compaction of particularly designed concrete mixes to achieve adequate compact
Explain the Confined Aquifer and Piezometric Surface Confined Aquifer Groundwater is confined by impervious geologic stratums on all sides. The water may be under pressure.
HSC approved codes of pratice
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