Patent US4529567A successfully refreshed from Google Patents.
US4529567A
Expired / Lapsed
US
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Process and device for manufacturing concrete structural elements
Assignee: Bouygues SA
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Filing: 1984-06-15
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Granted: 1985-07-16
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Expires: 2004-06-15
Abstract
Abstract The invention relates to an apparatus and method for manufacturing concrete structural elements. In order to manufacture the elements, setting of the concrete takes place in a casing (1), while the concrete is compressed with an axial pressure of at least 50 MPa and the casing is surrounded with a hoop (2,3) so as to create transverse planes of pressure.
Inventors
- 👤 Pierre Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:36
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/40; B28B7/46; B28B3/00; B28B3/02; B28B3/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
57 words
A process for manufacturing a concrete structural element, comprising: placing concrete in a casing, axially compressing the concrete in said casing (1) while the concrete is setting at an axial pressure of at least 50 MPa, surrounding the casing during the compressing and setting with a hoop (2, 3) so as to create transverse planes of pressure.
Claim 2
Dependent Claim
57 words
A process for manufacturing a concrete structural element, comprising: placing concrete in a casing, axially compressing the concrete in said casing (1) while the concrete is setting at an axial pressure of at least 50 MPa, surrounding the casing during the compressing and setting with a hoop (2, 3) so as to create transverse planes of pressure.
Claim 3
Dependent Claim
18 words
Process according to claim 1, characterized in that a pressure in the range of 50-150 MPa is used.
Claim 4
Dependent Claim
27 words
Process according to claim 2, characterized in that, during compression, the water is drained from the concrete via at least one tube (5) introduced inside the concrete.
Claim 5
Dependent Claim
27 words
Process according to claim 1, characterized in that, during compression, the water is drained from the concrete via at least one tube (5) introduced inside the concrete.
Claim 6
Independent Claim
45 words
A device for molding a concrete structural element, comprising: a tubular casing (1) which extends along an axis, means (2,3) producing a hoop around the tubular casing and means (8-12) for compressing the concrete along the axis of the casing during setting of the concrete.
Claim 7
Independent Claim
45 words
A device for molding a concrete structural element, comprising: a tubular casing (1) which extends along an axis, means (2,3) producing a hoop around the tubular casing and means (8-12) for compressing the concrete along the axis of the casing during setting of the concrete.
Claim 8
Dependent Claim
33 words
Device according to claim 5, characterized in that the hoop comprises at least two helical windings (2,3) around the casing, these two windings having winding directions opposite to each other and fixed ends.
Claim 9
Dependent Claim
37 words
Device according to claim 6, characterized in that the two ends of the windings (2,3) which are situated at the same end of the tubular casing are fixed to a ring (6) which surrounds the casing (1).
Claim 10
Dependent Claim
28 words
Device according to claim 6, characterized in that one of the windings (2) is in contact with the casing (1) and is surrounded by the other winding (3).
Claim 11
Dependent Claim
24 words
Device according to claim 5, characterized in that said tubular casing (1) is designed to spread the stresses and resist shearing by the hoop.
Claim 12
Dependent Claim
25 words
Device according to claim 9, characterized in that the said tubular casing (1) is a thin-walled steel tube which, is provided with drainage holes (4).
Claim 13
Dependent Claim
29 words
Device according to claim 5, which also comprises at least one tube (5) arranged longitudinally in the concrete so as to drain the water from the concrete during compression.
Claim 14
Dependent Claim
57 words
Device according to claim 5, characterized in that the means (8-12) for compressing the concrete comprise pressure plates (8,9) located at the two longitudinal ends of the casing and at least one cable (10,11) passes through the concrete mass longitudinally and exerts on at least one of the plates a pulling effect directed towards the other plate.
Claim 15
Dependent Claim
20 words
Device according to claim 12, characterized in that the said at least one cable (10,11) passes through a tube (5).
Claim 16
Dependent Claim
20 words
Device according to claim 13, characterized in that said at least one cable (10,11) passes through a drainage tube (5).
References Cited (Backward Citations)
US2210553A
Cited
US2579801A
Cited
US2550858A
Cited
US3034192A
Cited
US3234619A
Cited
US3384942A
Cited
US3738786A
Cited
US3583047A
Cited
US3822106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |