US3843288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tendon anchorage with threaded support element
Assignee: CONENCO INT Ltd
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Filing: 1971-03-01
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Granted: 1974-10-22
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Expires: 1991-03-01
Abstract
Abstract A tendon anchorage for use in forming prestressing concrete members which preferably includes a tubular mounting means mounted to extend through a tapered edge supporting bore beyond the wedge supporting surfaces in the anchorage in order to secure the anchorage in fixed spaced relation to a concrete form to seal the small diameter end of the bore against ingress of concrete during casting of the anchorage into the concrete member is disclosed. The mounting tube further preferably is formed to secure the anchorage from the side thereof remote to the concrete form and to urge the anchorage against a spacing means placed between the anchorage and the concrete form. Bearing plates having tapered bores may similarly be secured by the mounting means through a tendon receiving opening from the remote side thereof.
Inventors
- 👤 G Howlett
- 👤 J Howlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:16
CPC Classifications
E; E04; E04C; E04C5/00; E04C5/08; E04C5/12; E04C5/122; B; B28; B28B; B28B23/00; B28B23/02; B28B23/04; B28B23/043
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
318 words
An anchorage assembly for casting an anchorage means into a concrete member for receipt of a tendon for formation of a prestressed concrete member, comprising: a. a concrete form having an opening therein to receive assembly mounting means therethrough; b. assembly mounting means removably mounted in said opening in said form and extending from an exterior side thereof through said opening and interiorly of said form a distance sufficient to allow mounting of spacing means and anchorage means thereon; c. spacing means mounted on said mounting means and positioned in abutting relation to said form, said spacing means being of a predetermined thickness to position an anchorage means in spaced relation to said form; d. anchorage means having a wall defining an axially convergently tapered bore dimensioned at the smallest point thereof to receive said assembly mounting means and a tendon to be tensioned and formed to receive convergently actuating tendon gripping means, said anchorage means including bearing plate means formed with a bearing surface to allow transfer of axial tensioning forces to said concrete member, said anchorage means being releasably mounted on said mounting means with said mounting means extending through said tapered bore and said anchorage means being positioned thereon in abutting relation to said spacing means, said spacing means further preventing the ingress of concrete into said tapered bore in said anchorage means as mounted in abutting relation therewith and being removable from said concrete member to afford access to saId tapered bore for insertion of tendon gripping means therein; e. securement means releasably mounted on said mounting means on the exterior side of and bearing upon said form and releasably mounted adjacent the inner end of said mounting means, said securement means and mounting means urging said assembly of said anchorage means and spacing means against said form and securing said assembly in close abutting relation thereto during the casting of said concrete member.
Claim 2
Dependent Claim
318 words
An anchorage assembly for casting an anchorage means into a concrete member for receipt of a tendon for formation of a prestressed concrete member, comprising: a. a concrete form having an opening therein to receive assembly mounting means therethrough; b. assembly mounting means removably mounted in said opening in said form and extending from an exterior side thereof through said opening and interiorly of said form a distance sufficient to allow mounting of spacing means and anchorage means thereon; c. spacing means mounted on said mounting means and positioned in abutting relation to said form, said spacing means being of a predetermined thickness to position an anchorage means in spaced relation to said form; d. anchorage means having a wall defining an axially convergently tapered bore dimensioned at the smallest point thereof to receive said assembly mounting means and a tendon to be tensioned and formed to receive convergently actuating tendon gripping means, said anchorage means including bearing plate means formed with a bearing surface to allow transfer of axial tensioning forces to said concrete member, said anchorage means being releasably mounted on said mounting means with said mounting means extending through said tapered bore and said anchorage means being positioned thereon in abutting relation to said spacing means, said spacing means further preventing the ingress of concrete into said tapered bore in said anchorage means as mounted in abutting relation therewith and being removable from said concrete member to afford access to saId tapered bore for insertion of tendon gripping means therein; e. securement means releasably mounted on said mounting means on the exterior side of and bearing upon said form and releasably mounted adjacent the inner end of said mounting means, said securement means and mounting means urging said assembly of said anchorage means and spacing means against said form and securing said assembly in close abutting relation thereto during the casting of said concrete member.
Claim 3
Dependent Claim
304 words
In a tendon anchorage assembly to be cast-in-place in a concrete member, said assembly including: a form board having an opening therein to receive assembly mounting means therethrough; spacing means formed to space anchorage means from said form board and to prevent ingress of concrete into anchorage means from the side adjacent said spacing means and further formed to be removable after casting said concrete members and formed with a channel to allow passage of assembly mounting means therethrough, said spacing means being positioned in abutting relation with said form board and with said channel in alignment with said opening; and anchorage means having a wall defining an axially convergently tapered bore to provide wedge supporting surfaces and dimensioned at the smallest point of said bore to receive assembly mounting means and a tendon to be tensioned, said anchorage means including bearing plate means formed with a bearing surface to allow transfer of axial tensioning forces to said concrete member and said anchorage means being positioned in abutting relation to said spacing means with said bore being in alignment with said channel; the improvement comprising: assembly mounting means removably mounted in said opening in said form board and being formed to and extending from an exterior side of said form board through said opening, through said channel in said spacing means, and into said tapered bore in said anchorage means and beyond said wedge supporting surfaces, said mounting means further including securement means formed to bear upon and releasably secure said mounting means to said form board on the exterior side of said form board and releasably secure said mounting means to said anchorage means adjacent the inner end of said mounting means, said securement means further being formed to allow said assembly to be urged into close abutting relation against said form board.
Claim 4
Dependent Claim
304 words
In a tendon anchorage assembly to be cast-in-place in a concrete member, said assembly including: a form board having an opening therein to receive assembly mounting means therethrough; spacing means formed to space anchorage means from said form board and to prevent ingress of concrete into anchorage means from the side adjacent said spacing means and further formed to be removable after casting said concrete members and formed with a channel to allow passage of assembly mounting means therethrough, said spacing means being positioned in abutting relation with said form board and with said channel in alignment with said opening; and anchorage means having a wall defining an axially convergently tapered bore to provide wedge supporting surfaces and dimensioned at the smallest point of said bore to receive assembly mounting means and a tendon to be tensioned, said anchorage means including bearing plate means formed with a bearing surface to allow transfer of axial tensioning forces to said concrete member and said anchorage means being positioned in abutting relation to said spacing means with said bore being in alignment with said channel; the improvement comprising: assembly mounting means removably mounted in said opening in said form board and being formed to and extending from an exterior side of said form board through said opening, through said channel in said spacing means, and into said tapered bore in said anchorage means and beyond said wedge supporting surfaces, said mounting means further including securement means formed to bear upon and releasably secure said mounting means to said form board on the exterior side of said form board and releasably secure said mounting means to said anchorage means adjacent the inner end of said mounting means, said securement means further being formed to allow said assembly to be urged into close abutting relation against said form board.
Claim 5
Dependent Claim
68 words
In an anchorage assembly as defined in claim 2, the further improvement wherein, said tapered bore converges in a direction away from said form board, said mounting means extends through said tapered bore to the remote side of said anchorage means, and said securement means is formed to prevent ingress of concrete into the front end of said tapered bore between said mounting means and said tapered bore.
Claim 6
Dependent Claim
96 words
In an anchorage assembly as defined in claim 2, the further improvement wherein, said mounting means is provided by an elongated generally cylindrical member, and said securement means is provided by continuously threaded portions over a substantial length of the inner and outer ends of said cylindrical member, said threaded portions being formed to engage and be secured by mating threaded elements provided at said form and said anchorage means to allow continuous axial adjustment of the distance at which said bearing plate is secured to said form board at both ends of said cylindrical member.
Claim 7
Dependent Claim
63 words
In an anchorage assembly as defined in claim 4, the further improvement wherein, said mounting means is formed with threads on the external diameter of the inner end thereof, and said fastening means is comprised of internally facing threads formed in said anchorage means at the small diameter end of said bore and formed to mate with said threads on said mounting means.
Claim 8
Dependent Claim
80 words
In an anchorage assembly as defined in claim 2, the further improvement wherein, said mounting means extends beyond said anchorage means to a position to provide a recess in said concrete member after castiNg of said concrete member and removal of said mounting means, said mounting means being dimensioned to extend so that said recess is of a depth to allow advancement of said gripping means upon loading of said tendon to a position for maximum gripping of said tendon.
Claim 9
Dependent Claim
101 words
In an anchorage assembly as defined in claim 2, the further improvement wherein, said bearing plate means is provided by a separate bearing plate, said bearing plate being formed with an opening therein for passage of said tendon therethrough and being mounted on the side of said anchorage means facing away from said form with said opening in alignment with said tapered bore, said mounting means extending through said opening in said bearing plate and formed for securement of said bearing plate and anchorage means in abutment and in fixed spaced relation to said form during casting of said concrete member.
Claim 10
Dependent Claim
132 words
A post-tensioning assembly for concrete slabs and beams, including an elongated tube having one end portion threaded and the other end portion formed and adapted to receive a protective sheath thereover, said tube having an intermediate portion thereof threaded, an anchorage plate positioned over said tube and having at least one bore threaded on said intermediate portion, an elastomeric hole defining block positioned over said tube adjacent said anchorage plate and between said anchorage plate and said threaded end portion, means on said threaded end portion for rotating said tube within said anchorage, and bearing means between said last named means and said block, said bearing means being threaded on said threaded end portion, whereby the position of said bearing means relative to said block may be adjusted axially of said tube.
Claim 11
Dependent Claim
132 words
A post-tensioning assembly for concrete slabs and beams, including an elongated tube having one end portion threaded and the other end portion formed and adapted to receive a protective sheath thereover, said tube having an intermediate portion thereof threaded, an anchorage plate positioned over said tube and having at least one bore threaded on said intermediate portion, an elastomeric hole defining block positioned over said tube adjacent said anchorage plate and between said anchorage plate and said threaded end portion, means on said threaded end portion for rotating said tube within said anchorage, and bearing means between said last named means and said block, said bearing means being threaded on said threaded end portion, whereby the position of said bearing means relative to said block may be adjusted axially of said tube.
Claim 12
Dependent Claim
20 words
The structure of claim 8 characterized by and including frictional gripping means on the other end portion of said tube.
Claim 13
Dependent Claim
55 words
The structure of claim 9 wherein said anchorage plate has plural bores therein extending parallel to one another and a tube is received within each bore, each tube being identical and having a hole defining block of the type defined thereon adjacent said anchorage, each tube having said rotating means and said bearing means thereon.
Claim 14
Dependent Claim
135 words
A post-tensioning assembly for concrete slabs and beams, including an anchorage plate having a pair of hubs positioned alongside one another and extending from one side of said plate, said hubs having generally parallel bores therein and extending through said plate, an elongated tube extending through each bore and extending on opposite sides of said plate, each tube being threaded in its associated bore, elastomeric hole defining means positioned over each tube adjacent said hubs, the projecting ends of said tubes on the other side of said plates being formed and adapted to receive plastic protective sheaths thereover, the other projecting ends of said tubes having means for rotating the tubes thereon, and bearing means between said hole defining means and each said rotating means and being adjustably positionable along the length of said tubes.
Claim 15
Dependent Claim
135 words
A post-tensioning assembly for concrete slabs and beams, including an anchorage plate having a pair of hubs positioned alongside one another and extending from one side of said plate, said hubs having generally parallel bores therein and extending through said plate, an elongated tube extending through each bore and extending on opposite sides of said plate, each tube being threaded in its associated bore, elastomeric hole defining means positioned over each tube adjacent said hubs, the projecting ends of said tubes on the other side of said plates being formed and adapted to receive plastic protective sheaths thereover, the other projecting ends of said tubes having means for rotating the tubes thereon, and bearing means between said hole defining means and each said rotating means and being adjustably positionable along the length of said tubes.
Claim 16
Dependent Claim
46 words
The structure of claim 11 wherein each tube has exterior threads between said rotating means and said hole defining means and bearing means are rotatably positioned on said threads to adjustably accommodate varying thicknesses of form boards between said hole defining means and said bearing means.
Claim 17
Dependent Claim
156 words
A post-tensioning assembly for concrete slabs and beams, including an elongated cable and means for holding one end portion of the cable within a concrete mass, an anchorage assembly positioned on the cable and near the other end of said cable, said anchorage being defined by an elongated tube received over the other end portion of said cable, an anchorage plate received over said tube, said plate being in threaded engagement with an intermediate portion of said tube, said tube having opposite ends extending from opposite sides of said plate with one end within said concrete mass and the other end projecting outwardly from said mass, said othEr end of said tube having means for rotating said tube thereon and bearing means adjustably positioned along the length of the tube between said rotating means and said plate, said one end of said tube having an end portion of a protective sheath surrounding said cable received thereover.
Claim 18
Dependent Claim
156 words
A post-tensioning assembly for concrete slabs and beams, including an elongated cable and means for holding one end portion of the cable within a concrete mass, an anchorage assembly positioned on the cable and near the other end of said cable, said anchorage being defined by an elongated tube received over the other end portion of said cable, an anchorage plate received over said tube, said plate being in threaded engagement with an intermediate portion of said tube, said tube having opposite ends extending from opposite sides of said plate with one end within said concrete mass and the other end projecting outwardly from said mass, said othEr end of said tube having means for rotating said tube thereon and bearing means adjustably positioned along the length of the tube between said rotating means and said plate, said one end of said tube having an end portion of a protective sheath surrounding said cable received thereover.
Claim 19
Dependent Claim
20 words
The structure of claim 13 wherein said first named means is defined by a second anchorage of the type described.
Claim 20
Dependent Claim
31 words
The structure of claim 13 wherein two cables with anchorage assemblies of the type described are positioned side by side, said anchorage plate having plural bores therein for receiving said tubes.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |