52
MODERN GASWORKS PRACTICE
Foundations Building Roofing
1—i 1—J
IC -’1 Ül ü< cn
F* *
6-5(W. per oubic foot.
With. the concrete structure much depends, of course, on the comparative cost of bricks and ballast on the site. If the latter can be dug from the subsoil the concrete building is inapproacliable on grounds of economy. In one instance, prior to the European War, a building of this type was recently erected for rather less than l%d. per cubic foot. The total capacity amounted to 750,000 cubic feet,
the founda-tions were 6 to 8 feet deep, and the con-crete forming the sides was sliuttered up to a heigkt of 24 feet, the remaining 10 feet t o the eaves b e i n g composed of moulded concrete blocks. In this case ballast was obt a i n a b 1 e from the site, and the major
Fig. 10.—A Vebtical Retort Hoüse in Hy-Rib and Concrete Pilling.
part of the foundations were composed of 3 parts of coke breeze, 3 parts of clinker, 3 parts of washed ballast, and 1 part of cement. The filling material and concrete blocks were made up of 7 to 8 to 1 concrete, 3 parts of this being ballast. In struc-tures of this type care should be taten to ensure that clinker or breeze in the concrete
does not come into actual contact with the steelwork.
So far as retort house construction is concerned at the present time, a usual rough. rule for arriving at an approximate cost for a brick-panelled or brick and concrete house per mouthpiece to be installed is the following
For stage house
For subway house .
£70 to £125 per mouthpiece. . £60 „ £115 „
These prices in.clu.de merely the house and coal store, and no machinery, retort-bench work or flooring. They allow, however, for foundations. The lower margin