US3631831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improvements in or relating to concrete structure
Assignee: CERTIFIED CONCRETE Ltd
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Filing: 1968-11-05
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Granted: 1972-01-04
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Expires: 1988-11-05
Abstract
Abstract The manufacture of a channel-shaped ferroconcrete unit in which a ferroconcrete bottom slab and two ferroconcrete side slabs having pretensioned tendons or passageways passing from the bottom slab to the remote edge of each side slab are arranged in channel formation with the tendons being stressed whereby suitable stress loads in the tendons are realized within the bottom slab and side slabs. The pretensioned tendons pass around radiused bends at each junction between the bottom slab and one of the side slabs.
Inventors
- 👤 William Morley Sutherland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:03
CPC Classifications
B; B63; B63B; B63B5/00; B63B5/14; B63B5/16; B63B3/00; B63B3/02; B63B3/04; B63B3/06; B63B3/14; B63B3/16; B63B3/18; B63B3/185
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
115 words
A method of manufacturing a channel-shaped ferroconcrete unit, comprising the steps of forming a ferroconcrete center slab in which pretensioned tendons are positioned, forming two-ferro concrete side slabs through which said pretensioned tendons pass to the remote side of each side slab, arranging the slabs in channel formation and post tensioning the tendons in the side slabs so that suitable stress loads in the tendons are obtained within the center slab and the side slabs, passing said tendons around radiused bends at each junction between the center slab and one of the side slabs, and positioning corner beams between the side slabs and the center slab and positioning the radiused bends in the corner beams.
Claim 2
Independent Claim
115 words
A method of manufacturing a channel-shaped ferroconcrete unit, comprising the steps of forming a ferroconcrete center slab in which pretensioned tendons are positioned, forming two-ferro concrete side slabs through which said pretensioned tendons pass to the remote side of each side slab, arranging the slabs in channel formation and post tensioning the tendons in the side slabs so that suitable stress loads in the tendons are obtained within the center slab and the side slabs, passing said tendons around radiused bends at each junction between the center slab and one of the side slabs, and positioning corner beams between the side slabs and the center slab and positioning the radiused bends in the corner beams.
Claim 3
Independent Claim
89 words
A method of manufacturing a ferroconcrete vessel such as a barge, comprising the steps of placing ready for assembly a series of modular units each including a bottom slab having pretensioned tendons therein, corner beams and side slabs, passing said pretensioned tendons through passageways in the side slabs and corner beams, post tensioning the tendons therein, passing pretensioned tendons longitudinally through passageways so that the modular units are combined to define the vessel bottom sides and ends, and tensioning and anchoring the longitudinal tendons to provide a monolithic vessel.
Claim 4
Independent Claim
89 words
A method of manufacturing a ferroconcrete vessel such as a barge, comprising the steps of placing ready for assembly a series of modular units each including a bottom slab having pretensioned tendons therein, corner beams and side slabs, passing said pretensioned tendons through passageways in the side slabs and corner beams, post tensioning the tendons therein, passing pretensioned tendons longitudinally through passageways so that the modular units are combined to define the vessel bottom sides and ends, and tensioning and anchoring the longitudinal tendons to provide a monolithic vessel.
Claim 5
Dependent Claim
54 words
The method as claimed in claim 2 comprising mounting prestressed ferroconcrete deck slabs on at least some of the units through which post tensioned longitudinal and pretensioned transverse tendons pass, interposing diaphragm slabs between some units, fixing transverse stern and bow beams and anchoring at least some of the longitudinal tendons to such beams.
Claim 6
Dependent Claim
62 words
A ferroconcrete structure comprising at least a center slab, pretensioned tendons positioned in said center slab, two-side slabs cooperable with said center slab and through which said tendons pass, said tendons in said side slabs being post tensioned and said tendons in said side slabs being post tensioned by a suitable settable material applied under pressure to the gaps between the slabs.
Claim 7
Dependent Claim
62 words
A ferroconcrete structure comprising at least a center slab, pretensioned tendons positioned in said center slab, two-side slabs cooperable with said center slab and through which said tendons pass, said tendons in said side slabs being post tensioned and said tendons in said side slabs being post tensioned by a suitable settable material applied under pressure to the gaps between the slabs.
Claim 8
Dependent Claim
24 words
The ferroconcrete structure as claimed in claim 4 in which said suitable settable material is selected from a cement grout and an epoxy resin.
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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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |