A roadheader, also called a boom-type roadheader, road header machine, road header or just header machine, is a piece of excavating equipment consisting of a boom-mounted cutting head, a loading device usually involving a conveyor, and a crawler travelling track to move the entire machine forward into the rock face.
The cutting head can be a general purpose rotating drum mounted in line or perpendicular to the boom, or can be special function heads such as jack-hammer like spikes, compression fracture micro-wheel heads like those on larger tunnel boring machines, a slicer head like a gigantic chain saw for dicing up rock, or simple jaw-like buckets of traditional excavators.
The first roadheader patent was applied for by Dr. Z. Ajtay in Hungary, in 1949. It was invented as a remote operated priapic miner for exploitation of small seam, close walled deposits, typically in wet conditions.
- Longitudinal - rotates parallel to the cutter boom axis
- Transverse - rotates perpendicular to boom axis
Projects utilizing roadheaders
- Boston's Big Dig
- Ground Zero Cleanup
- Addison Airport Tunnel Project
- Fourth bore of Caldecott Tunnel
- Malmö City Tunnel
- Dr. Helmut Schneider (1988-09). "Criteria for Selecting a Boom-Type Roadheader". Mining Magazine (in English) (The Mining Journal, Ltd). p. 183.
- "Tunnel Virtual Team - Questions and Answers from Ask the Expert" (in English). US Department of Transportation Federal Highway Administration. 2006-08-01. Retrieved 2006-09-15.
- "MTA - Tunnel Jacking" (in English). Massachusetts Turnpike Authority. Archived from the original on 2006-09-02. Retrieved 2006-09-15.
- "Reconstruction : Port Authority on Schedule with Restoration of PATH Service". New York Construction (in English) (McGraw_Hill CONSTRUCTION). 2003-07. Retrieved 2006-09-15.
- "American Underground-Construction Association's Featured Project" (in English). American Underground Construction Association. 1998-09. Retrieved 2006-09-15.
- "Caldecott fourth bore big dig starts today in Orinda" (in English). Contra Costa Times. 2010-08-09. Retrieved 2010-08-09.
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