Concrete Pipe & Box Culvert Installation - Shaw Precast Solutions

INSTALLATIONBOX ALIGNMENTIt is critical that the first box sections be installedcorrectly as they will determine the line and gradeof the following boxes. If these are not correct, futureconnections may be affected.BOX PLACEMENTPlacement of boxes should start at the outlet endof the line of box sections. The bell end should pointupstream and the spigot or tongue should pointdownstream. Unless otherwise approved by theowner, loads from construction equipment transferredto a box section before, during, or after fillplacement, either directly or through the fill, shouldnot be greater than the loads assumed in the design(ASCE 26-97). Using excavating machineryfor the purpose of pushing boxes into place shouldbe avoided, since this could cause cracking, requiringon-site repairing. Also, dropping or dragging thesection over gravel or rock is not advised.A proper foundation for construction equipmentshould be available in order to ensure that no damageis caused to the leveling course and the sidewallsof the excavation area.JOINTINGJointing is important in reducing the migration ofsoil fines and water between box sections and theirsurroundings. Depending on the use of the box culvert,various materials and methods may be usedfor sealing the joints.Box culverts specified for a soil-tight joint can besealed between the joint with a bituminous masticsealant. Either liquid butyl (bulk mastic) or nonshrinkgrout can be added to the outside top slabAmerican Concrete Pipe Association • www.concrete-pipe.org 73