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English Professional Engineers' Examination

English Professional Engineers' Examination

English Professional Engineers' Examination

(OP)
Here is the examination paper of Chartered Structural Examination

http://www.istructe.org.uk/exams/db/310.asp

I have a question about Q3 which is a bridge question…….
Since the water level is quite high, any foundation works down below the water table should not be accepted. My solution is to close one carriageway and install three rows of bored piles in the central reserve and the side slope. Next, precast beams are put on those piles and it can be re-opened to traffic. Later the adjacent carriageway will receive the same engineering works.

Finally, after all precast beams have been in place, the soil underneath these beams will be removed to vacate the necessary space for the construction of the new roads.

Does any experienced bridge engineer have any comment?

In addition, the horizontal load and water table are pretty high, I would like to use secant bored piles or “diaphragm wall”. Is it feasible? My concern is the precision of the pile construction, i.e., the heads of the piles should be at the exact locations so that the precast beams can perfectly (may be a bit harsh) sit on the pile caps.

Regards,

Steve

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