This document discusses various construction methods for bridges. It begins with a brief history of bridge development from 1900 to 2000. It then covers basic concepts like span, compression, tension, and load. It discusses shallow foundations using columns, mats, walls, spread footings, and strap footings. It also discusses different types of pile foundations like end bearing piles, friction piles, compaction piles, and tension piles. The types of piles chosen depends on factors like soil type. It describes methods of pile installation like diesel hammer, vibratory methods, and jacking methods. It concludes by covering precast segmental erection techniques using falsework, gantry, crane, lifting frame, and full span erection.