Plans to pump money into rebuilding the nation’s roads, bridges and other infrastructure could give companies that make machinery and materials a solid foundation for growth. Caterpillar, with its heavy machinery, and construction materials company Vulcan Materials could see years of additional business as roads and bridges are rebuilt and buildings are modernized. The benefits would be even broader, impacting Sherwin-Williams, United Rentals and others. Washington is still debating the size and scope of any spending package, but economists and analysts expect an eventual deal that will help support a wide swath of industries tied to a national infrastructure overhaul.