Patent US3673754A successfully refreshed from Google Patents.
US3673754A
Expired / Lapsed
US
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Lift up process
Assignee: JFE Kizai Forming Co Ltd
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Filing: 1970-07-14
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Granted: 1972-07-04
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Expires: 1990-07-14
Abstract
Abstract A lift-up process for constructing a tall tubular structure comprising providing a plurality of unit structures which, when combined together, form the tubular structure, engaging a first level unit structure with a plurality of guide rods at the same level, each of the guide rods having shoulders formed at an interval corresponding to the stroke of a piston of an incremental oil pressure jack, incrementally raising said unit structure by an oil pressure jack on each guide rod, placing a second level unit structure just below the first level unit structure and welding the first and second level unit structures together, and repeating the above steps to place and weld successive level unit structures.
Inventors
- 👤 Hidekichi Murashige
- 👤 Masao Simakura
- 👤 Kazuo Nakazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:49
CPC Classifications
E; E04; E04H; E04H12/00; E04H12/28; E04G; E04G21/00; E04G21/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
190 words
A method of constructing tubular structures from plural tubular units comprising providing at least one turret having a support at the top thereof, providing plural guides for said units attached to said support by a load compensating piston assembly, providing hydraulic jack assemblies attached to said guides by plural incremental shoulders on said guides and plural upper and lower clamps, said clamps being movable with respect to each other by changing the pressure in the cylinders of said jacks, attaching an upper unit to the jack assemblies while the unit is adjacent the lower point of the structure, raising the attached unit a distance sufficient to allow positioning a next unit below the upper unit by hydraulic pressure in the jack assemblies by activating said assemblies so that said upper clamp is raised to a subsequent shoulder, and then said lower clamp is raised an equal number of shoulders, positioning said next unit below said upper unit, attaching said next unit to said upper unit, and repeating the raising and attaching steps to attach subsequent units until the structure is complete, and removing said turrets, supports, guides and jack assemblies.
Claim 2
Independent Claim
190 words
A method of constructing tubular structures from plural tubular units comprising providing at least one turret having a support at the top thereof, providing plural guides for said units attached to said support by a load compensating piston assembly, providing hydraulic jack assemblies attached to said guides by plural incremental shoulders on said guides and plural upper and lower clamps, said clamps being movable with respect to each other by changing the pressure in the cylinders of said jacks, attaching an upper unit to the jack assemblies while the unit is adjacent the lower point of the structure, raising the attached unit a distance sufficient to allow positioning a next unit below the upper unit by hydraulic pressure in the jack assemblies by activating said assemblies so that said upper clamp is raised to a subsequent shoulder, and then said lower clamp is raised an equal number of shoulders, positioning said next unit below said upper unit, attaching said next unit to said upper unit, and repeating the raising and attaching steps to attach subsequent units until the structure is complete, and removing said turrets, supports, guides and jack assemblies.
Claim 3
Dependent Claim
33 words
The method of claim 1 wherein said load compensating piston assemblies are activated by means of a remote hydraulic pressure source to equalize the load on each of said guides and jack assemblies.
Claim 4
Dependent Claim
33 words
The method of claim 1 wherein the distance between shoulders on said guides is from 75 to 100 percent of the distance equal to the stroke of the piston in said jack assemblies.
Claim 5
Dependent Claim
47 words
The method of claim 1 wherein there are provided plural turrets and support assemblies, each of said support assemblies having plural guide means and plural jack assemblies, and being positioned in a vertical arrangement, the second and subSequent turrent-support-guide-jack assembly being utilized incrementally during structural construction steps.
Claim 6
Dependent Claim
32 words
The method of claim 4 wherein said load compensating pistons are activated by means of a remote hydraulic pressure source to equalize the load on each of said guides and jack assemblies.
Claim 7
Dependent Claim
33 words
The method of claim 4 wherein the distance between adjacent shoulders on said guides is from 75 to 100 percent of the distance constituting the stroke of the piston in said jack assemblies.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |