US4076778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Climbing formwork
Assignee: Individual
•
Filing: 1976-04-20
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Granted: 1978-02-28
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Expires: 1996-04-20
Abstract
Abstract Climbing formwork for use in the erection of reinforced concrete structures in which the raising of the formwork from storey to storey is carried out by the use of movable vertically extending members the height of which when fully extended is in excess of the height of two storeys of a building to be erected, the members being maintained in their correct vertical positions by supporting tubes set into the concrete of the structure. The members carry between them beams or the like for supporting the outer forms and preferably some or all of the inner forms used for pouring the structure and are raised to a height equivalent to that of one storey of the structure after the completion of the pouring of the concrete of a storey. The vertically extending members are preferably in the form of double acting hydraulic cylinders having a piston extendable under hydraulic pressure, the extension of the piston being utilized for raising the forms. Alternatively the vertically extending members may be of constant length and raised by means of climbing jacks.
Inventors
- 👤 Alan Charles Whitting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:35
CPC Classifications
E; E04; E04G; E04G11/00; E04G11/06; E04G11/20; E04G11/28
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
294 words
A method of erecting a concrete structure utilizing climbing formwork, said method comprising the steps of: constructing footings for said structure; erecting inner and outer forms on said footings; supporting vertically extending open tubular support means on said footings between said inner and outer forms; casting a first storey of said structure between said inner and outer forms and around said open tubular support means; inserting, into said open tubular support means, respective double-acting hydraulic jacks, each including a cylinder supported on said footings, a piston movable in the cylinder and an upwardly extending piston rod secured to the piston, with each jack having an extended height exceeding the height of two storeys of said structure; attaching the outer forms to means carried on the upper ends of said piston rods, after the concrete of said first storey has sufficiently set, extending said jacks to take the weight of said forms; stripping said forms from said first storey of said structure; further extending said jacks to elevate said outer forms into positions for pouring the next storey of said structure; supporting said outer forms on the set concrete of the previously cast story of said structure; elevating said inner forms into position for pouring the next storey of said structure; supporting said piston rods on said outer forms while operating said jacks to elevate said cylinders a height corresponding to one storey of said structure; supporting said cylinders in the elevated position; positioning further vertically extending open tubular support means on said first-mentioned tubular support means coaxially of the latter; pouring concrete between said inner and outer forms and around said further open tubular support means, for the next storey of said structure; and repeating the foregoing steps for each storey of the structure.
Claim 2
Independent Claim
294 words
A method of erecting a concrete structure utilizing climbing formwork, said method comprising the steps of: constructing footings for said structure; erecting inner and outer forms on said footings; supporting vertically extending open tubular support means on said footings between said inner and outer forms; casting a first storey of said structure between said inner and outer forms and around said open tubular support means; inserting, into said open tubular support means, respective double-acting hydraulic jacks, each including a cylinder supported on said footings, a piston movable in the cylinder and an upwardly extending piston rod secured to the piston, with each jack having an extended height exceeding the height of two storeys of said structure; attaching the outer forms to means carried on the upper ends of said piston rods, after the concrete of said first storey has sufficiently set, extending said jacks to take the weight of said forms; stripping said forms from said first storey of said structure; further extending said jacks to elevate said outer forms into positions for pouring the next storey of said structure; supporting said outer forms on the set concrete of the previously cast story of said structure; elevating said inner forms into position for pouring the next storey of said structure; supporting said piston rods on said outer forms while operating said jacks to elevate said cylinders a height corresponding to one storey of said structure; supporting said cylinders in the elevated position; positioning further vertically extending open tubular support means on said first-mentioned tubular support means coaxially of the latter; pouring concrete between said inner and outer forms and around said further open tubular support means, for the next storey of said structure; and repeating the foregoing steps for each storey of the structure.
Claim 3
Dependent Claim
68 words
A method as claimed in claim 1, including the steps of, after pouring concrete for a story of said structure and allowing the same to set, raising all forms; constructing a reinforced concrete floor on the completed and set walls of said structure; thereafter lowering said forms onto the reinforced concrete floor after the latter has been set; and repeating said steps for each storey of said structure.
References Cited (Backward Citations)
US1887835A
Cited
US3275719A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |