. Central station heating. t can be built ofreinforced concrete or brick, and is a very easy tunnel to build withcollapsible forms. The undcrdrainage is located on either requires a somewhat wider trench, but is more efficient in-stalled this way. .y arrangement of piping can be secured that isdesired. The usual floor drainage should be provided and water-proofing of the tunnel is necessary. Angle iron supports are shown here, but bar iron, channel ironor I-beam supports can be used. As a rule, the passageway should be, at least, 2 ft. wide in theclear, and it is better to make it 30
. Central station heating. t can be built ofreinforced concrete or brick, and is a very easy tunnel to build withcollapsible forms. The undcrdrainage is located on either requires a somewhat wider trench, but is more efficient in-stalled this way. .y arrangement of piping can be secured that isdesired. The usual floor drainage should be provided and water-proofing of the tunnel is necessary. Angle iron supports are shown here, but bar iron, channel ironor I-beam supports can be used. As a rule, the passageway should be, at least, 2 ft. wide in theclear, and it is better to make it 30 in. Manhole openings should be made in any tunnel system, if it isnot self-ventilating, and heating tunnels should not be self-ventilat-ing, for it increases the heat toss in the mains. An electric fan,which can be attached to the lighting circuit necessary in everytunnel, will, in conjunction with two manhole openings, give suf-ficient ventilation for the men working in the tunnel on any repairwork. PIPE LINE DESIGN 59. This drawing shows a wooden box conduit, built up of three of hemlock or cypress lumber. The air spaces are filledwith hair felt or building paper. The pipe is covered with a thinasbestos covering to protect the shavings from charring when usedfor steam. The shavings are sometimes treated with oil or creosote. This conduit is very efificient as long as it has not is not durable and will deteriorate rapidly. The rapidity of decayof the wood depends upon the soil in which the conduit is stages or wet and dry conditions have a decidedly badeflfect. The underdrainage here shown is very bad. If the soil is notporous (when no underdrain is necessary) it will hold back allwater that should drain away, and the drain will do no good at is a very common fault that the author has found many timesin taking up this style of conduit to replace it with new correct method of underdrainage is shown in another
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Keywords: ., bookcentury1900, bookdecade1910, bookidcentralstati, bookyear1912
