Chicago : Engineering and Contracting Pub. Co. · leaf 195
If shafts are to be sunkin a new territory a pipe-way should undoubt-edly be placed as the shaft is sunk. With the determination of the size of thecompartments the dimensions of the timbersare decided. Rock pressures are practicallyindeterminate. Sandstone actually requires notimbering if the rib… … Pipe Way Wall Plate Punch Block dapped into Wall PlatesCenter Buntons dovetailed into Wall PlatesEnd Bunton halved into Wall Plate Fig. 4—Typical Timber Set. Timber shafts are usually rectangular in shape,and to best handle the many operations neces-sary in mining a shaft mine must have at leasttwo…
Buildings
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
