File:Building and engineering news (1916) (14778463941).jpg

Identifier: buildingengineer1616cont (find matches)
Title: Building & engineering news
Year: 1914 (1910s)
Authors: Contractors' and Dealers' Association of California
Subjects: Architecture Building Construction industry Engineering
Publisher: San Francisco : L. A. Larson
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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ith chutes and buggies. The biggest portion wasplaced direct from chutes without wheeling. Previousto the installation of pneumatic concrete mixers and con-veyors a portion of the concrete lining of the tunnel sec-tions was similarly placed. The imoiiniatic mixer used consists of a steel cylinderwitlr a Tcnc shaped liottom at the point of which is at- slab forms the pipe is led into a steel receiving hopper atthe section to be poured. This hopper is suspended fromthe arch .segments of the timber lining: from the hopperextend chutes into the forms to be filled. This hopperwas necessary as ■shooting the concrete from the pipedirectly into the forms displaced the reinforcing steel andconduits. For concreting the arch, the conveying pipe is led intothe forms; as the arch has reinforcing steel only In theiiitrados, the concrete can be ■shot in without displacingleinforccment. By this pneumatic method, concrete has iUli.LTlXC .Wl) ICiNClXKIilRIXG NI5\VS W.■linos,!;,y, .luiie 21. 19lt!
Text Appearing After Image:
lini.niNC AND KNCINKKUIXC NRWS W r.lne.-^ilHV. Iviiu- ■2\. inii; lieen inixsd. conveyed and placed in forms situated _2,5U0teet from the pneumatic mixer on an upgrade of 1.15 percent. It is exiieclcd tiiat concrete will be conveyed by thismnhod over •■1.0iK> feet up the ?. per cent srade from theeasterly workings. The concrete of the footings and the walls and slabshas been dnne mostly under a regular procedure. The■heel (the footing of the side walls) was poured in 80IJ lOO-tcot sections and about the third day after, the con-creting of the sidewalls and ceiling slab of that section in:iO to 40-foot lengths was begun. During the interveningtwo days, th? footing forms were stripped, the track forthe jumbo laid and the steel firms were being set. Asthe walls and slabs were being poured, the setting of thesteel forms was finished and excavation and form settingfor a section of footing ahead carried on. The arch was concieteii in much longer sections, thel.our being continuous

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