Patent US3810872A successfully refreshed from Google Patents.
Patent US5144710A successfully refreshed from Google Patents.
US5144710A
Expired / Lapsed
US
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Composite, prestressed structural member and method of forming same
Assignee: Individual
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Filing: 1991-02-28
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Granted: 1992-09-08
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Expires: 2011-02-28
Abstract
Abstract A composite, prestressed structural member, such as a bridge unit and methods of forming such a member. The apparatus includes a plurality of longitudinally extending girders which are transversely spaced and a plurality of adjacent composite units disposed on the girders. Each composite unit has a plurality of beams with a molded deck portion formed thereabove. The beams are positioned transversely with respect to the girders and attached thereto. Additional, longitudinal beams are disposed between the transversely extending beams over the girders. The longitudinal beams are attached to the girders and by connectors to the molded deck. The structure is formed by positioning the girders on a construction support adjacent to a center portion of the girders such that the free ends of the girders cantilever and deflect downwardly. The beams of the composite units are attached to the girders in this construction position. Any gaps between adjacent composite units are filled with a non-shrink, high strength grout. When moved to an operating position wherein opposite ends of the girders are supported, the natural deflection of the unit due to its weight imparts a compressive prestress longitudinally in the molded deck units. Each molded deck unit may be formed such that it is also transversely prestressed.
Inventors
- 👤 Stanley J. Grossman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:35
CPC Classifications
E; E01; E01D; E01D21/00; E01D21/06; E01D2/00; E01D2/02; E01D2101/00; E01D2101/20; E01D2101/24; E01D2101/26; E01D2101/28; E01D2101/285
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
209 words
A method of constructing a prestressed structural member comprising the steps of: positioning a plurality of girders in a construction position on a construction support adjacent to a center portion of the girders, such that opposite free ends of said girders cantilever away from said construction support and are free to deflect downwardly due to the weight thereof, said girders extending in a longitudinal direction; positioning a plurality of composite structural units on upper portions of said girders, each of said composite structural units comprising: a plurality of transverse beams extending in a transverse direction with respect to said girders and engaging said upper portions thereof; and a molded deck portion engaged with said transverse beams, a transversely extending side of the molded deck portion of each composite structural unit generally facing a transversely extending side of the molded deck portion of an adjacent composite structural unit; and attaching said transverse beams to said girders in said construction, position to form a complete structural member; moving said complete structural member from said construction position to an operating position, wherein said complete structural member is supported adjacent to said opposite ends of said girders, at least some of said molded deck portions are placed in compression in said longitudinal direction.
Claim 2
Independent Claim
209 words
A method of constructing a prestressed structural member comprising the steps of: positioning a plurality of girders in a construction position on a construction support adjacent to a center portion of the girders, such that opposite free ends of said girders cantilever away from said construction support and are free to deflect downwardly due to the weight thereof, said girders extending in a longitudinal direction; positioning a plurality of composite structural units on upper portions of said girders, each of said composite structural units comprising: a plurality of transverse beams extending in a transverse direction with respect to said girders and engaging said upper portions thereof; and a molded deck portion engaged with said transverse beams, a transversely extending side of the molded deck portion of each composite structural unit generally facing a transversely extending side of the molded deck portion of an adjacent composite structural unit; and attaching said transverse beams to said girders in said construction, position to form a complete structural member; moving said complete structural member from said construction position to an operating position, wherein said complete structural member is supported adjacent to said opposite ends of said girders, at least some of said molded deck portions are placed in compression in said longitudinal direction.
Claim 3
Dependent Claim
81 words
The method of claim 1 wherein each of said composite structural units further comprises a longitudinal beam extending longitudinally with respect to said girders between adjacent transverse beams of the corresponding composite structural unit, each longitudinal beam engaging said upper portion of the corresponding girder and being engaged by the molded deck portion of the corresponding composite structural unit; and further comprising the step of attaching each longitudinal beam to a corresponding girder while said girders are in said construction position.
Claim 4
Dependent Claim
35 words
The method of claim 1 further comprising the steps of: positioning a longitudinal diaphragm between transverse beams of adjacent composite structural units; and attaching said longitudinal diaphragm to said upper portion of the corresponding girder.
Claim 5
Dependent Claim
15 words
The method of claim 3 further comprising attaching said diaphragm to an adjacent transverse beam.
Claim 6
Dependent Claim
34 words
The method of claim 1 wherein transversely extending sides of adjacent molded deck portions are flush and substantially abut one another when said transverse beams are attached to said girders in said construction position.
Claim 7
Dependent Claim
32 words
The method of claim 1 wherein: transverse gaps are defined between corresponding facing transversely extending sides of adjacent molded deck portions; and said gaps are filled with a high strength grouting material.
Claim 8
Dependent Claim
26 words
The method of claim 6 wherein said grouting material has a compressive stress at least as great as a compressive stress of said molded deck portions.
Claim 9
Dependent Claim
18 words
The method of claim 1 wherein said step of attaching said transverse beams to said girders comprises welding.
Claim 10
Dependent Claim
54 words
The method of claim 1 wherein said construction support is a first operational support for one of said ends of said girders when said complete structural member is in said operating position, said first operational support being spaced from a second operational support used for supporting the opposite of said ends of said girders.
Claim 11
Dependent Claim
21 words
The method of claim 9 wherein said girders extend about one-half of a distance between said first and second operational supports.
Claim 12
Dependent Claim
75 words
The method of claim 9 further comprising the steps of: attaching a girder extension to at least one of said girders adjacent to an end thereof nearest to said second operational support, said girder extension extending to said second operational support and being at least partially supported thereby; and rolling said complete structural member with said girder extension attached thereto toward said second operational support until said complete structural member is in said operating position.
Claim 13
Dependent Claim
16 words
The method of claim 11 further comprising detaching said girder extension after said step of rolling.
Claim 14
Dependent Claim
33 words
The method of claim 1 wherein: each of said composite structural units further comprises a shear connector extending from said transverse beams; and said molded deck portion is molded around said shear connectors.
Claim 15
Dependent Claim
30 words
The method of claim 1 wherein each of said composite structural units is separately formed prior to said step of positioning said plurality of composite structural units on said girders.
Claim 16
Dependent Claim
52 words
The method of claim 14 wherein each of said composite structural units is formed in an inverted position such that at least a portion of said molded deck portion is placed in compression in said transverse direction when the corresponding composite structural unit is positioned on said upper portions of said girders.
Claim 17
Dependent Claim
51 words
The method of claim 1 further comprising the steps of: attaching a lifting frame to said complete structural member, said lifting frame having a longitudinal length of less than about one-fourth a longitudinal length of said girders; and lifting said complete structural member by said lifting frame to said operating position.
Claim 18
Dependent Claim
40 words
The method of claim 16 wherein: said construction support engages said center portions of said girders at a pair of locations longitudinally spaced apart; and said longitudinal length of said lifting frame is at least the distance between said locations.
References Cited (Backward Citations)
US2725612A
Cited
US2730797A
Cited
US3577504A
Cited
US3588971A
Cited
US3608048A
Cited
US3618889A
Cited
SU737545A1
Cited
US4620400A
Cited
US4493177A
Cited
US4700516A
Cited
US4531857A
Cited
US4604841A
Cited
US4646493A
Cited
SU1474201A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-08 | 1996-03-09 | 1996-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-08 | 2000-03-09 | 2000-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-08 | 2004-03-09 | 2004-09-08 | $7700.00 | Window Closed / Lapsed |