Home > Term: forepoling girder
forepoling girder
One of two or more heavy straight girders set over and in advance of the last permanent support in a tunnel. They provide protection to the worker until there is space to erect another support.
- ส่วนหนึ่งของคำพูด: noun
- อุตสาหกรรม/ขอบเขต: Mining
- Category: General mining; Mineral mining
- Government Agency: USBM
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- ed.young
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(Milwaukee, United States)