. The Street railway journal . SHORING UP DURING EXCAVATION panying views show the method of laying the McRoy con- joints are broken. In laying the pipes the adjoining end:- duit, which has been adopted for approximately one-thirdthe work of the Metropolitan Street Railway Companyand for about half of the new work of the Third AvenueRailway Company. This conduit is made of vitrified clay in 6 ft. lengths, fit closely and the pipe is held in perfect alignment by ironor steel dowel pins. These pins are 4 ins. in length andhave a shoulder at their center to prevent them slippinginto the dowel hol
. The Street railway journal . SHORING UP DURING EXCAVATION panying views show the method of laying the McRoy con- joints are broken. In laying the pipes the adjoining end:- duit, which has been adopted for approximately one-thirdthe work of the Metropolitan Street Railway Companyand for about half of the new work of the Third AvenueRailway Company. This conduit is made of vitrified clay in 6 ft. lengths, fit closely and the pipe is held in perfect alignment by ironor steel dowel pins. These pins are 4 ins. in length andhave a shoulder at their center to prevent them slippinginto the dowel holes further than intended. The pipes are lined up on mandrels, and after each. METHOD OF WRAPPING JOINTS CURVE CONSTRUCTION NEAR UNION SQUARE each section haAdng four ducts. A standard four-duct con-duit is shown in side and end elevation herewith The conduit is laid on a foundation of concrete havinga thickness of at least 3 ins. A wall of concrete of at least length is so lined up and the joints made, each duct istested with the mandrel to secure perfect alignment andcontinuity. These mandrels are made of wood about 12ins. in length, of cylindrical pattern, and 3 ins. in diameter. December, 1898.] STREET RAILWAY JOURNAL. 775 Fixed to the end of each is an eye to which is attached ahandle made of J in. iron and about 7 ft. long. The joints are rendered watertight by covering themwith a wrap made by thoroughly saturating a double thick-ness of burlap 8 ins. wide in hot liquid asphalt and wrap-ping it immediately around the joints. Before applyingthe wrap it is considered advisable to coat the ends of theconduit with asphalt to insure the wrap taking a firmerhold
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
