Pinetown Bushong's Mill Covered Bridge
The Pinetown Bushong's Mill Covered Bridge is a covered bridge that spans the Conestoga River in Lancaster County, Pennsylvania, United States. A county-owned and maintained bridge, its official designation is the Big Conestoga #6 Bridge. The bridge is also known as Pinetown Covered Bridge, Nolte's Point Mill Bridge and Bushong's Mill Bridge. The bridge has a single span, wooden, double Burr arch trusses design with the addition of steel hanger rods. The deck is made from oak planks. It is painted red, the traditional color of Lancaster County covered bridges, on both the inside and outside. Both approaches to the bridge are painted in red with white trim. The bridge's WGCB Number is 38-36-05. Added in 1980, it is listed on the National Register of Historic Places as structure number 80003527. It is located at (40.10533, -76.24817). Lititz Run joins the Conestoga River at this site. History The bridge was built in 1867 by Elias McMellen at a cost of $4,500. In 1972 ...
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Burr Arch Truss
The Burr Arch Truss—or, simply, Burr Truss or Burr Arch—is a combination of an arch and a ''multiple kingpost'' truss design. It was invented in 1804 by Theodore Burr, patented on April 3, 1817, and used in bridges, usually covered bridges. Design The design principle behind the Burr arch truss is that the arch should be capable of bearing the entire load on the bridge while the truss keeps the bridge rigid. Even though the kingpost truss alone is capable of bearing a load, this was done because it is impossible to evenly balance a dynamic load crossing the bridge between the two parts. The opposite view is also held, based on computer models, that the truss performs the majority of the load bearing and the arch provides the stability. Either way, the combination of the arch and the truss provides a more stable bridge capable of supporting greater weight than either the arch or truss alone. Gallery The U.S. state of Indiana has a large collection of Burr Truss bridge ...
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