Category:727 Structural Plate Pipe and Structural Plate Pipe-Arch Culverts
727.1 Construction Inspection for Sec 727
Very large pipes, both round and arched, are often fabricated of heavy gauge steel plates for assembly in the field. All the comments on bedding and backfill for other types of pipe culverts apply to this type of structure.
The assembly of this type of pipe is not difficult but requires considerable care. It is most important that procedures for alignment of bolt holes not distort the metal or elongate holes. Bolts must be positioned properly. The tightening sequence must pull the plates tightly together over the entire contact area.
Final measurements are required and should be recorded in the inspectors diary to the nearest foot for each structure. Measurements are to be taken along the center or the vertical dimension of the structure. These entries should be dated and signed by the inspector making them.
An inspection of all new installed pipe should be made. It should be tested for the criteria set forth in the Inspection heading in the spec. book for the applicable pipe. The inspector should make sure the pipe is from an approved source and is properly marked. The inspector should not accept any pipe that does not have a MoDOT pipe identification number listed on the bill of lading. Please note, each type, size, class, etc. of pipe on the bill of lading should have a unique MoDOT identification number. Concrete and metal pipe are inspected at the plant by District Construction and Materials. Plastic pipe is sampled at the project. District Construction and Materials should be contacted when the material arrives on site. Care should be made so that sampling does not leave the contractor short of certain sizes and length of pipe. Tape measures or other devices can be used for a preliminary measurements for diameter deflection. If the results are in question the mandrel test will serve as the definitive test for deflection. Always make sure that when testing the right measurement unit is used. Pipe can be produced in either English or Metric units. Make sure the measurements are taken in the same units as the pipe was produced. The Qualified List for each type of pipe will indicate the manufacturer's identification mark and the units (English or metric) that was used to fabricate the pipe.
727.2 Materials and Laboratory Inspection for Sec 727