Apparatus for in situ lining of an upwardly open shaft with mono

Plastic article or earthenware shaping or treating: apparatus – Utilizing subterranean feature as shaping means

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61 41R, 166287, 425 64, E21D 500

Patent

active

040676757

ABSTRACT:
A slipform for lining upright shafts with monolithic concrete by pumping concrete downwardly under pressure to a slipform apparatus to simultaneously move the slipform apparatus upwardly within the shaft while concrete is being formed continuously into a monolithic lining within the shaft. The apparatus includes outer and inner slipform members. The outer member includes a sealing mechanism by which the area above the outer slipform is hydraulically sealed from the area below. The inner slipform fits within a conical recess of the outer slipform and includes a lower cylindrical portion for forming the open inside diameter of the lining. Concrete, in a plastic, wet condition, is pumped under pressure between the two slipform members to be molded against the shaft wall into an upwardly open monolithic concrete lining. Since the concrete is pumped between the two forms under pressure, a reaction force is created that operates upwardly against the slipform members. The concrete will thus act to push the forms upwardly within the shaft as it is pumped through the forms. The rate of ascent of the forms is timed in accordance with the setting time of the concrete. Thus, the upwardly moving forms leave a finished, hardened monolithic lining.

REFERENCES:
patent: 233826 (1880-10-01), Wilson
patent: 1006248 (1911-10-01), Martin
patent: 2748442 (1956-06-01), Butcher
patent: 3049783 (1962-08-01), Hanson
patent: 3049787 (1962-08-01), Hannan, Jr. et al.
patent: 3126959 (1964-03-01), Ortloff
patent: 3377669 (1968-04-01), Burgess
patent: 3958637 (1976-05-01), Cobbs

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