Concrete Pipe & Box Culvert Installation - Shaw Precast Solutions

tion, and connected by means of a chain or cableto the grab hook on the pipe to be installed. Bypulling the lever back, the tongue or spigot of thepipe being jointed is pulled into the bell or grooveof the last installed pipe section. To maintain closecontrol over the alignment of the pipe, a laying slingcan be used to lift the pipe section slightly off thebedding foundation.When jointing larger diameter pipe, when granularbedding is used, mechanical pipe pullers arerequired. Several types of pipe pullers or comealongdevices have been developed but the basicforce principles are the same.Large diameter pipe can be jointed by placing adead man blocking inside the installed pipe, severalsections back from the last installed section,which is connected by means of a chain or cableto a strong back placed across the end of the pipesection being installed. The pipe is pulled home bylever action similar to the external assembly.Mechanical details of the specific apparatusused for pipe pullers or come-along devices mayvary, but the basic lever action principle is used toAmerican Concrete Pipe Association • www.concrete-pipe.org 45