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La Farge Mine Tunnel Extension

Sugar Creek, Missouri



LaFarge North America


LaFarge North America


LaFarge North America


November 2007

Due to the concerns of falling rock at one of their limestone facilities, LaFarge North America (LNA) needed to secure the mine entrance from debris as soon as possible.

After consulting with Contech about their unique situation, LNA chose a 28’ CON/SPAN precast arch because of the structures ability to withstand heavy impact loading. Construction was difficult in the very narrow working conditions between the rocks. However, each arch was lifted and set with heavy crane and instillation was complete in four hours.

LNA is the largest diversified supplier of construction materials in the North America. The company produces and sells cement, ready-mixed concrete, gypsum wallboard, aggregates, asphalt, and related products and services. These products are used across North America to build residential developments, office buildings, schools, hospitals, and recreational facilities.

Technical Description:

  • Span: 28 ft
  • Rise: 11 ft
  • Length: 24 ft

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