. The Street railway journal . he rail flange and of an average width of 15 ins. The beamwill be laid in a trench which shall be partially excavated be-low the sub-grade and partially left in the concrete paving foun-dation. The concrete for the beam shall be prepared as follows:One measure of Alsens or any other equally good Portland ce-ment, and two and one-half measures of clean, sharp sand, freefrom loam or clay, will be thoroughly mixed dry and then madeinto mortar with the least possible amount of water. Five meas-ures of crushed or broken bowlders, crushed or broken granite,or crushed o
. The Street railway journal . he rail flange and of an average width of 15 ins. The beamwill be laid in a trench which shall be partially excavated be-low the sub-grade and partially left in the concrete paving foun-dation. The concrete for the beam shall be prepared as follows:One measure of Alsens or any other equally good Portland ce-ment, and two and one-half measures of clean, sharp sand, freefrom loam or clay, will be thoroughly mixed dry and then madeinto mortar with the least possible amount of water. Five meas-ures of crushed or broken bowlders, crushed or broken granite,or crushed or broken hard limestone, thoroughly cleaned fromdust and dirt, drenched with water ,but containing no loose waterin the heap, will then be incorporated immediately with the mor-tar. The broken stone shall not be less than y2 in. in its smallest,nor more than 2 ins. in its greatest dimension. Each batch ofconcrete will be thoroughly mixed, the mixing to be continued onthe board until each piece of stone is completed coated with. VIEW SHOWING BEAM FORMS IN POSITION mortar, and will at once be placed in the trench, thoroughlytamped under the rail and rammed until free mortar appears uponthe surface. This work shall be so done that when the concreteis set the rail shall be firmly supported thereby at every point inthe rail length and the track surface be not disturbed as to lineor grade. The surface of this beam concrete shall be broughtflush with the top of the concrete paving foundation. The wholeoperation of mixing and laying each batch of concrete will beperformed as expeditiously as possible by the use of a sufficientnumber of skilled men. CONCRETE CURVES, ETC. All switches, curves, etc., known as special work, will be laidupon 6 in. x 8 in. x 6 ft. 6 in. sawed oak ties. Underneath the ties willbe laid a solid bed of concrete 6 ins. deep, extending 6 ins. longerat each end (12 ins. longer in all) than the length of track, sup-ported by said oak ties, and 3 ins. wider on each s
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
