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Insulating Pipes from Vibration and Deformation
Pipes (gas, water and others) carried by bridges, sheathed tunnels or other metal structures commonly rest on stands or are suspended by means of stirrups. In neither case is there adequate insulation from the carrying structure, consequently the pipes are subjected to the influence of vibration, and, still more serious, to be disjointed owing to deformation of the carrying members. To mitigate both these accidents it is suggested that stirrups should he suspended by means of springs, and that in special cases a spiral spring should be interposed between the crown of the pipe and the structural member immediately above it. When pipes are carried in cradles, springs can be inserted in the rests to act as buffers or cushions. (Deutsche Bauzeitung, No. 58.)
THE progress made in reinforced concrete construction during the past twenty years has been so great that a knowledge of the principles of reinforced concrete design is now almost essential to every young structural engineer who has his career before him; the past ten years has seen a very valuable and extensive addition to the literature of the subject, but many students still have considerable difficulty in following the treatment usually given.
Ewart S. Andrews
PRESENT-DAY conditions imperatively ,demand efficiency,reached by economical means, in
everything concerning building. Prices, as the rcsult of high wages and the scarcity of skilled labour, still rule above the normal. This necessity for care is felt as keenly in the matter of painting as in other branches. Painting is essentially a protective process, only secondarily a beautifying or decorative one. Paint, therefore, must be applied thoroughly, to secure complete covering and good adherence.