Introduction to TechnologyChapter 20:
Heavy ConstructionChapter SummariesSection 20.1
Major projects like skyscrapers are heavy construction projects. The word skyscraper has come to mean a tall building with an interior support frame. Skyscraper safety is an important concern. Building codes and other forms of legislation lay down strict rules for modern construction. Section 20.2
All paved roads are made in three layers. The top layer is called the “surface.” Many bridges are strengthened with trusses. A truss is made of steel beams fastened together in the shape of many triangles. A metal tube called a “shield” fits inside a tunnel as it is constructed. Section 20.3
Dams have three main parts: the embankment, the outlet works, and the spillway. Monuments are large structures that appeal to the human spirit. The International Space Station orbits the earth. Its framework is a series of trusses.  | 
