| 摘要 |
This disclosure relates to an apparatus for erecting structures from flowable and settable material and includes a lifting unit having an open ended shell supported by a carrier pivotally attached to a medial portion of an arm disposed generally radially to the structure which is to be formed, a first pair of relatively telescopically movable inner and outer members connected to an outboard end of the arm in generally tangential relationship to the structure, first means for moving the inner and outer members telescopically relative to each other, and second means for moving the inner and outer members along the arm in a synchronous manner to that of the relative telescopic motion.
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