Embedment removal method

Details Embedment removal method Embedment removal method

2007-04-03

2007-04-03

Hong, John C. (Department: 3726)

Metal working

Method of mechanical manufacture

Disassembling

C029S426100, C029S402010

Reexamination Certificate

active

10997854

ABSTRACT:
Draft tube embedments of a hydroelectric turbine are removed for replacement and/or upgrading. Several shafts for saw wire access, forming a horizontal polygonal shape are drilled outside the draft ring and a circular slot cut below the bottom ring to meet the shafts. Shafts and slot encompass the embedments. Additional shafts are drilled for hoist slings. Generally radial cuts are made using diamond saw wires attached to saw wire machines from selected saw wire access shafts to the draft tube through the embedments. Back cuts are made between adjacent saw wire access shafts, again by diamond saw wires attached to saw wire machines, cutting the polygon into sections. Hoisting slings are passed down the hoisting sling shafts around the sections. The sections are then cut free by further back cuts and then hoisted from the draft tube. The method is quicker than conventional methods.

REFERENCES:
patent: 2050761 (1936-08-01), Newsom
patent: 3793698 (1974-02-01), Goings
patent: 4735188 (1988-04-01), Kubo
patent: 4832411 (1989-05-01), Johnston et al.
patent: 5148635 (1992-09-01), Porter

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