Identifier: architectenginee2210sanf (find matches)
Title: The Architect & engineer of California and the Pacific Coast
Year: 1905 (1900s)
Authors:
Subjects: Architecture Architecture Architecture Building
Publisher: San Francisco, Calif. : Architect and Engineer Co
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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er completing the excavation was to build the floorbase and backing walls ready for waterproofing. After careful consideration, it was determined to make the backingwalls 12 inches thick, and to limit their height to 4 feet in the first stage.(See Figure 2.) The height determined upon was sufficient to keep waterout of the waterproofed trench, except occasional flooding after heavy rains,and it was a convenient bench from which to work in placing rod rein-forcement against interior forms, and upon which to construct exteriorforms of the subway. It was considered, owing to lapse of time which mustensue in constructing the monolithic tube within the waterproof enclosure,that standing work would probably often be lost if carried higher than4 feet, by sags due to weight of fabric and augmented by temperatureexposure. Likewise the danger of damaging the fabric while building the The Architect and Engineer 83 ,;,-:i»»WJ*YWMiiilVV»rrJ-S DLJODDr i; snnnnnnaB fepi agnnnnnc: cnnnnnh SptODDDO
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reinforced tube inside of it was anticipated. Fears in respecl to thesematters were fully justified, as illustrated, by the case of an 8-foot subway,which was so situated that the complete waterproof sheet had to be placedup to the roof connection, and the subway built within. Much valuablewaterproofing work was destroyed in this trench, due to the causes abovecited. Another point bearing upon the practical application of the felt in thefirst stage of the subway waterproofing, above referred to. and in similarsituations, is the importance of so making angles and corners that they willbe durable during construction and tight after. Angles at junction of fiatand standing work are natural weak spots in pitch and felt waterproofing. In the subways referred to. the first scheme tried required that thesheets be carried full across the floor and up both backing walls in onecontinuous strip, but two very serious objections to this procedure -became evident. In the first place it was impractic

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