Concrete Pipe & Box Culvert Installation - Shaw Precast Solutions

develop the necessary controlled pulling force.The use of excavating equipment to push pipesections should be done with extreme caution. Theforce applied by such equipment can damage thepipe. Direct contact between installation machineryand the pipe is prohibited. Use appropriate cushionmaterial between the pipe and the machine to preventspalling.SERVICE CONNECTIONSWhen a pipe connects to a rigid structure suchas a building, manhole or junction chamber, thebedding and foundation for the connecting pipesection should be highly compacted to minimizedifferential settlement. Differential settlement canresult in the pipe being sheared or cracked at theconnection. Special connectors are available whichprovide flexibility between the connecting pipe andthe structure.CURVED ALIGNMENTChanges in direction of sewer lines are usuallyaccomplished at manhole structures, while gradeand alignment changes in concrete pipe sewerscan be incorporated into the line through the useof deflected straight pipe, radius pipe or specials.Since manufacturing and installation feasibility aredependent on the particular method used to negotiatea curve, it is important to establish the methodprior to trench excavation. For deflected straightpipe the joint of each pipe section is opened up onone side while the other side remains in the homeposition. The difference between the home andopened joint space is generally designated as thepull. The maximum permissible pull must be limitedto that opening which will provide satisfactory jointperformance. This varies for different joint configu-46American Concrete Pipe Association • www.concrete-pipe.org