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File:Image from page 383 of "Engineering and Contracting" (1909) (14598499050).jpg

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Identifier: engineeringcontr33chicuoft Title: Engineering and Contracting Year: 1909 (1900s) Authors: Subjects: Publisher: Chicago


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Text Appearing Before Image: Fig. 6. leakage between the dam and rock and all hol-lows and channels thoroughly filled with grout-ed work. The top surface of the filling of dam will beprotected by riprap of stone suitably laid andextending back a distance of about 6 ft. fromback line of coping. All mortar to be composed of hydraulic cementof some approved manufacture and good cleansharp sand mixed in the proportion of two ofsand to one of cement. The mortar to be pre-pared only as fast as wanted and none havingonce set to be mixed and used in any part of thework. This is a first-class dam on a first-classfoundation. The fifth dam was on the Pachaug Riverwhere the drainage area is 61 square miles. ■m-

Text Appearing After Image: Cnf Cmf^ Lei/^e Fig. 7. The spillway is 111 ft. long by 7 ft. high. Thecross section of the spillway is shown in Fig.8. The foundation is excellent blue gravel.The specifications were as follows: The whole ground to be occupied by rollway,abutments, and apron is to be excavated to thedepth of bottom of mudsill under old apron,which is to be known as the grade line. The priming or sheet piling under dam andabutments is to be set 4 ft. from upper faceof dam in the middle of a trench excavated 3 ft.wide at a level 3 ft. below grade line or as much lower as may be necessary to get to goodmaterial. Except that if boulders too large to be readilyremoved without blasting are met, the pilingmay be scribed to them, and the Joints wellcemented. Piling to be sound chestnut plank 3 ins. thick,free from unsound knots and wormholes and ac-curately jointed, or of 3-in. spruce plank tonguedor carefully hand spliced and grocned. and freefr6m loose knots. The piling is to be pointed and cornered anddri


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Source Image from page 383 of "Engineering and Contracting" (1909)
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