Author: Helsby, C
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THE subject of this paper may be considered somewhat out of the ordinary for discussion by the members of the Institution of Structural Engineers. As, however it has an important bearing on the preparation of the foundations which support the structures designed and built by the members of this Institution, it will be seen that it is a matter of primary importance. Without the use of compressed air it is sometimes impossible to reach a sound foundation by ordinary excavation methods, or even by piling. The foundations of bridges crossing wide rivers and estuaries in deep water are generally built in caissons sunk under compressed air. Subaqueous tunnels in water-bearing strata are driven by shields with the aid of compressed air to balance the water pressure, and many harbour works are built by divers or by diving bells. Sir Henry Japp
I HOPE you realise that I do not intend to read a paper; I merely wish to take advantage of this opportunity to show you some slides, and to add a few comments. Almost all of the slides refer to settlement of foundations, and the comments (led essentially with the effect of the settlement on the factor of safety of the buildings. Professor Dr. Ing. K. Von Terzaghi