US3858374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triaxially prestressed polygonal concrete members
Assignee: International Environmental Dynamics Inc
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Filing: 1973-10-09
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Granted: 1975-01-07
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Expires: 1993-10-09
Abstract
Abstract A triaxially prestressed concrete member having a polygonal cross-section is disclosed. The member includes an elongate hollow casing which has a polygonal, usually square or rectangular cross-section. Elongate arcuate liners are located within the casing and are co-extensive therewith. The opposite side lateral edges of each liner are in abutment with adjacent interior corners of the casing. These liners divide the hollow interior of the casing into at least three side sections defined by the concave surfaces of the respective arcuate liners and the interior surfaces of the casing, and a central section defined by the convex surfaces of the liners. Non-expansive concrete material fills the side portions of the casing, and expansive concrete material fills the central portion. The radial expansion of the expansive concrete is restrained by the arcuate liners which are in contact with the interior corners of the casing to radially or biaxially prestress the concrete. Longitudinal expansion of the expansive concrete material is prohibited by adherence of the concrete to the convex surfaces of the arcuate liners to prestress the concrete in a third triaxial direction.
Inventors
- 👤 Emanuel Ben-Zvi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:53
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/30; E04C3/34; E04C3/02; E04C3/20; E04C3/26
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
111 words
A form for the construction of a triaxially prestressed concrete member comprising at least three side-defining elongate members, Each side-defining member including an elongated planar portion and an elongated arcuate portion each having opposite side lateral edges in abutment with corresponding side lateral edges of the other, each side-defining elongate member being adjacent to two other of the said elongate members and joined thereto along adjacent lateral edges of the planar portions thereof so that the convex surfaces of the arcuate portions of the side-defining elongate members define an elongate chamber adapted to receive expansive concrete therein, said expansive concrete being confined by the side-defining members to prestress said expansive concrete.
Claim 2
Dependent Claim
111 words
A form for the construction of a triaxially prestressed concrete member comprising at least three side-defining elongate members, Each side-defining member including an elongated planar portion and an elongated arcuate portion each having opposite side lateral edges in abutment with corresponding side lateral edges of the other, each side-defining elongate member being adjacent to two other of the said elongate members and joined thereto along adjacent lateral edges of the planar portions thereof so that the convex surfaces of the arcuate portions of the side-defining elongate members define an elongate chamber adapted to receive expansive concrete therein, said expansive concrete being confined by the side-defining members to prestress said expansive concrete.
Claim 3
Dependent Claim
25 words
A form as recited in claim 1 and additionally comprising non-expansive concrete intermediate the planar portion and the arcuate portion of each side-defining elongate member.
Claim 4
Dependent Claim
185 words
A triaxially prestressed concrete member comprising: an elongate hollow casing having a substantially polygonal section defining three or more interior walls meeting at interior corners, said casing having a preselected length; at least three elongate interior liners being of preselected length substantially co-extensive with the length of said elongate casing, each said interior layer having an arcuate section normal to its elongate length between opposite side lateral edges, each said liner being placed overlying one of the interior walls of the casing respectively, the opposite side lateral edges of each said liner in abutment with the interior corners contiguous with the associated wall to divide the hollow interior of said casing into at least three side sections defined by the concave interior surfaces of the liners and the interior walls of the casing, said elongate interior liners when located within said casing further defining a central section defined by the convex surfaces of the arch-shaped members; non-expansive concrete material filling the side sections of the hollow interior of the casing; and expansive concrete material filling the central section of the hollow interior of the casing.
Claim 5
Dependent Claim
185 words
A triaxially prestressed concrete member comprising: an elongate hollow casing having a substantially polygonal section defining three or more interior walls meeting at interior corners, said casing having a preselected length; at least three elongate interior liners being of preselected length substantially co-extensive with the length of said elongate casing, each said interior layer having an arcuate section normal to its elongate length between opposite side lateral edges, each said liner being placed overlying one of the interior walls of the casing respectively, the opposite side lateral edges of each said liner in abutment with the interior corners contiguous with the associated wall to divide the hollow interior of said casing into at least three side sections defined by the concave interior surfaces of the liners and the interior walls of the casing, said elongate interior liners when located within said casing further defining a central section defined by the convex surfaces of the arch-shaped members; non-expansive concrete material filling the side sections of the hollow interior of the casing; and expansive concrete material filling the central section of the hollow interior of the casing.
Claim 6
Dependent Claim
20 words
A member as recited in claim 3 wherein the elongate hollow casing and the arcuate liners are constructed of steel.
Claim 7
Dependent Claim
25 words
A member as recited in claim 3 wherein the elongate hollow casing is constructed of steel, and the arcuate liners are constructed of pre-cast concrete.
Claim 8
Dependent Claim
28 words
A member as recited in claim 3 wherein the polygon section comprises a square section defining four interior walls, and wherein the liners comprise four elongate interior liners.
Claim 9
Dependent Claim
133 words
Apparatus for the construction of a sheathed, triaxially prestressed concrete member comprising: an elongate hollow casing having a polygonal-shaped cross-section defining three or more interior walls meeting at interior corners; means for defining an elongated central chamber within the elongate hollow casing, said central chamber being adapted to receive expansive concrete therein and inhibit axial expansion of said concrete to axially prestress said concrete, said chamber defining means including means connecting the central chamber to the elongate hollow casing at the interior corners of said casing, said connecting means adapted to substantially maintain a constant distance between the central chamber and each of the interior corners of the hollow casing so that the radial expansion of expansive concrete in the central chamber is restrained by the hollow casing to radially prestress said concrete.
Claim 10
Dependent Claim
133 words
Apparatus for the construction of a sheathed, triaxially prestressed concrete member comprising: an elongate hollow casing having a polygonal-shaped cross-section defining three or more interior walls meeting at interior corners; means for defining an elongated central chamber within the elongate hollow casing, said central chamber being adapted to receive expansive concrete therein and inhibit axial expansion of said concrete to axially prestress said concrete, said chamber defining means including means connecting the central chamber to the elongate hollow casing at the interior corners of said casing, said connecting means adapted to substantially maintain a constant distance between the central chamber and each of the interior corners of the hollow casing so that the radial expansion of expansive concrete in the central chamber is restrained by the hollow casing to radially prestress said concrete.
Claim 11
Dependent Claim
17 words
Apparatus as recited in claim 7 wherein the cross-section of the elongate hollow casing is substantially square.
Claim 12
Dependent Claim
17 words
Apparatus as recited in claim 7 wherein the cross-section of the elongate hollow casing is substantially rectangular.
Claim 13
Dependent Claim
73 words
Apparatus as recited in claim 7 wherein the means for defining a central chamber comprises the convex surfaces of a plurality of elongate liners having an arcuate cross-section and a length co-extensive with the length of the hollow casing, one said arcuate liner corresponding to each of the interior walls of said caSing respectively, each said arcuate liner having opposite lateral edges in abutment with adjacent interior corners of the elongate hollow casing.
Claim 14
Dependent Claim
83 words
Apparatus as recited in claim 7 wherein the means for defining a central chamber comprises the exterior surfaces of a plurality of liners co-extensive with the hollow casing, one said liner corresponding to each of the interior walls of the casing respectively, each said liner having opposite lateral edges in abutment with adjacent interior corners of the elongate hollow casing so the expansion of the expansive concrete is restrained by the hollow casing at the interior corners thereof to radially prestress said concrete.
Claim 15
Dependent Claim
108 words
Apparatus as recited in claim 7 wherein the means for defining a central chamber comprises an elongate thin-walled tube co-extensive with the casing, and a plurality of elongate blocks co-extensive with the hollow casing, one of the said blocks associated with each of the interior corners of the casing respectively, each said block having a curved surface adapted to contact the outer surface of the elongate tube and a second opposite surface adapted to be in abutment with the associated interior corner of the casing so that each said block substantially maintains a constant distance between the central chamber and the associated interior corner of the hollow casing.
Claim 16
Dependent Claim
13 words
Apparatus as recited in claim 12 wherein the blocks are constructed of steel.
Claim 17
Dependent Claim
14 words
Apparatus as recited in claim 12 wherein the blocks are constructed of pre-cast concrete.
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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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |