File:The Architect and engineer of California and the Pacific Coast (1909) (14577036610).jpg

Identifier: architectenginee0910sanf (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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h end. On account of the great height ofthis bridge and the necessary high cost of scafifolding to support thereinforced concrete structure during its construction, the engineers plannedto use this old wooden bridge, temporarily strengthening the same wherenecessary, for a working platform and staging to erect and help carrythe new structure. In order to utilize the old bridge, the engineers madetheir design so that the new structure would straddle the old trusses andthe final plans gave a twenty-foot clear roadway between curbs, withfour foot sidewalks on each side. Although the Arroyo Seco, as its name implies, is a dry stream ninemonths in the year, during the rainy season, there are periods when alarge volume of water, at times six feet deep with considerable velocity, Illustrations by courtesy of the Southwest Contractor and Manufacturer. tMember of the firm of Mayberry & Parker, Architectural Engineers. Pacific Electric P.uiMinKLos Angeles. •* 74 The Architect and Engineer
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Ki^ ■5 ^ The Architect and Engineer 75 has to be taken care of. A reinforced concrete bridge is one that isbuilt for all time, and so it was necessary to carry the foundations of thisbridge deep enough to preclude the possibility of a remote chance oftheir being undermined. In view of the fact that this stream carriesbut little drift, it was feasible to use isolated pier footings under thesetowers. These footings extended from a level of some eight feet abovethe lowest point in the river bed to from ten to sixteen feet below thispoint. They are six feet square at the bottom and three feet square ontop, there being four to each tower or one for each column. On excavating for these footings considerable water was encountered,being the underflow of the stream, and on two of the central towers thecontractors were obliged to pump day and night to keep down the waterlevel. Even then it was not possible to entirely pump the crib dry withthe available plant, and it became necessary to depos

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