The design of the Chicago and Northwestern Railway train shed (1909) (14574244040)

Identifier: designofchicagon00hill (find matches)

Title: The design of the Chicago and Northwestern Railway train shed

Year: 1909 (1900s)

Authors: Hillman, Frank William

Subjects: Chicago and North Western Railway Company Engine houses (Railroads) Railroads Theses

Publisher:

Contributing Library: University of Illinois Urbana-Champaign

Digitizing Sponsor: University of Illinois Urbana-Champaign

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cold for the mento work. The justification for this being that freezing does notmaterially injure concrete, its effect being only to retard theset of the cement and cause a slight peeling of the face. Howevej^as the materials came frozen up in large lumps, the fires wereadopted. An objection raised to heating the materials is thatthe water is dried out before crystallization takes place, but withlots of water it is probable that the materials are chilled againbefore they leave the mixer. Then too, it does not take muchwater to cause cement to set, and the heat of the materials cannotevaporate all of the water. Hov/ever, concrete that was to havea finished face was not placed in weather colder than 25° P. and allconcreting stopped at 15° . Another precaution taken in cold weather is that the con-crete is covered v/ith tarpaulins and the forms left on four tofive days, whereas in warm weather they are taken off thirty sixhours after concrete is placed. Manure is used quite extensively

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It would have to set on top of the coliamn and knee braces perpendi-cular to the beam would have to be employed in order to obtain a - 35 - for covering concrete in such cases, out being dirty and unhemdyto remove is objectionable. STEEL: As the steel will not be delivered to the work being consider-ed before June, only the design can be discussed. Fig. 15 ahowsthe typical design of the floor and shed, and fig. 16 shows in de-tail some of the irregularities of the floor. Por convenienceof discussion this topic will be divided into two divisions: thefloor design and the shed design. The reasons for having the track on a steel structure havealready been mentioned so it will not be necessary to give themagain. Referring to fig. 16 it will be noticed that in generalthe transverse portion of the floor consists of overhanging trackcarrying box girders and suspended platform beams, with the columnsin the center of the tracks. This arrangement is the most economi-cal because long simple spans

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1909

University of Illinois Urbana-Champaign

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