FACULTY OF PRACTICAL SCIENCE. Civil Engineering-Third Year. Timber and Concrete Platforms, and Cassions and 1. Define the Coffer dam. 2. Define a Caisson. 3. Define an open crib coffer dam. 4. Define puddle and how to make it. 5. Define wales, guide piles, sheet piling, caps, stays. 6. Draw a cross section of Coffer dam for the follow Fine sand to coarse gravel 389.78 to...384.70 No current. 7. Draw a timber and concrete grillage for the masonry of this foundation and give your reasons for using or not using a grillage under a mass of masonry. 8. State your theory as to action of a large weight of surrounding superincumbent material outside a coffer dam in giving stability to the foundation against settle ment. 9. State your views as to the cause and the effects of unequal settlement in the foundation bed of a structure. 10. Draw a pneumatic caisson either of wood or of iron for the following data:— H.W.M..... Water bed.... ...678.90 ..674.98 ..634.30 Fine sand to fine gravel 634.30 to......601.97 Fine gravel to coarse gravel 601.97 to..596.76 Coarse gravel to Rock 596.76 to.........592.05 Current one mile per hour. 11. State the conditions under which an open crib coffer dam is preferable to a pneumatic caisson. 12. Draw a section of an open crib coffer dam for a distance of 110 feet from H.W.M. to masonry bed with elevations as follows: FACULTY OF PRACTICAL SCIENCE. Civil Engineering-Third Year. Nature of Foundation Materials and Piling of 1. What are the characteristics of clay as a foundation material? 2. What is the nature of the boulder drift as a foundation material? 3. What is the nature of sand as a foundation material? 4. Under what circumstances would it be necessary to use bearing piles for a foundation in each one of the foregoing materials? What is the usual theory of the supporting power of a piled area under a mass of ma sonry. 5. Trautwine's formula for the supporting power of a single pile is as follows: Extreme load in tons= X0.23. Cube root of of ham (Cube root of) X (wt in abs.) (fall or ram ham-) in ft. mer in Last sinking in inches plus one Calculate the bearing power of a pile when the ram weighs 1400 lbs., and the last fall of hammer is 14 feet and the last sinking in inches of the pile is 2 inches. 6. Define factor of safety. 7. Calculate question 5 for a factor of safety of six. 8. Define sheet piling. |