Railway Practice a Span Classsearchtermspan Classsearchtermcollection
Railway Practice a Span Classsearchtermspan Classsearchtermcollection
Samuel Charles Brees
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Throughout the whole of the remaining part of the excavation, all Soil, Clay, Sand, Marie, or other materials above the aforesaid limestone rock, shall be taken out at a Slope of 2 feet base to 1 foot in perpendicular height, between the foot of which slopes, and the top of the cutting in the rock a Bench of 9 feet in width shall in all cases be left. The Slopes of the cutting in the limestone Rock to have 3 inches base to 1 foot in per- pendicular height. Whenever the Shale or other soft strat...a lying under the limestone is found to rise above the level of the bottom of the cutting, a portion of such shale or soft strata shall be excavated from under the limestone on each side of the cutting, and replaced by Walls, buttresses, arches, and inverts, as hereinafter described. Whenever the depth or thickness of such Shale or soft strata falls short of 14 feet, the side walls shall be of the dimensions shewn in Drawings, Nos. 3, and 4, and described in the specihcations relative thereto. To prevent any injury to the Slopes by the springs of water issuing from the rock and other strata in this excavation, the strictest attention will be required on the part of the Contractor, and the modes of drainage adapted to the varying thickness of the shale and other strata, are particu- larly described in the Drawings, Nos.
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