To speed muck handling of construction of $30-million East Boston vehicular tunnel, backhoe rig was built right into tunnel shield to load muck onto conveyor; rig is modified Pippin backhoe, originally designed to be attached to back of tractor.
Backhoe in shield helps dig East Boston tunnel
Construction Methods Equipment
Construction Methods and Equipment ; 42 , n 5
1960
5 pages
Article (Journal)
English
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