CHAPTER 7 CONSTRUCTION PROCEDURES - …
309INTRODUCTIONThis CHAPTER presents information of fundamental importance regarding installationand CONSTRUCTION PROCEDURES including base preparation, unloading and assembly,and placement and compaction of the backfill. The emphasis is on corrugated steelpipe in embankment installations such as highway culverts. For pipe in trenchinstallation such as storm sewers, reference should be made to the CSPI publication, Modern Sewer Design for a thorough presentation. For additional information,reference may also be made to ASTM recommended practices under ASTMdesignations A 796 / A 796 M, A 798 / A 798 M, and A 807 / A 807 well situated, properly bedded, accurately assembled, and carefully backfilledgalvanized steel drainage structure will function properly and efficiently over itsdesign life. Although smaller structures may demand less care in installation thanlarger ones, reasonable precautions in handling, base preparation, assembly andbackfilling are required for all steel structures, because of their strength, light weight and resistanceto fracture, can be installed quickly, easily and with the least expensive flexible steel shell is designed to distribute external loads to the backfill aroundit.
The portion of the foundation in contact with the bottom of the structure is referred to as the bedding. Depending upon the size and type of structure, the
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