Patent US3891731A successfully refreshed from Google Patents.
US3891731A
Expired / Lapsed
US
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Method of pre-stressing form tie systems
Assignee: Individual
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Filing: 1969-10-20
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Granted: 1975-06-24
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Expires: 1989-10-20
Abstract
Abstract A form anchor embedded in concrete is pre-stressed exclusively with respect to a connecting shebolt and the surrounding concrete to a substantial portion of the working load prior to the securing of the form to the shebolt.
Inventors
- 👤 Chester I Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:53
CPC Classifications
E; E04; E04G; E04G11/00; E04G11/06; E04G11/20; E04G11/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
148 words
A method of securing a form structure to an existing mass of concrete, said method including attaching in threaded engagement an anchor rod to a dummy bolt mounted in a form panel and projecting inwardly therefrom, pouring concrete around said anchor rod and the inner extremity of said dummy bolt device, removing said dummy bolt, attaching a stress bolt to said anchor in threaded engagement, and securing a form panel for the succeeding pour by securing the same to said stress bolt, wherein the improvement comprises: generating predetermined pre-stress in said anchor rod at least to the extent of the working load to be applied thereto by tightening the threaded engagement of said stress bolt therewith prior to the securing of said form panel to said stress bolt, said stress bolt remaining in axially substantially fixed position with respect to said concrete mass during said generation of pre-stress.
Claim 2
Independent Claim
148 words
A method of securing a form structure to an existing mass of concrete, said method including attaching in threaded engagement an anchor rod to a dummy bolt mounted in a form panel and projecting inwardly therefrom, pouring concrete around said anchor rod and the inner extremity of said dummy bolt device, removing said dummy bolt, attaching a stress bolt to said anchor in threaded engagement, and securing a form panel for the succeeding pour by securing the same to said stress bolt, wherein the improvement comprises: generating predetermined pre-stress in said anchor rod at least to the extent of the working load to be applied thereto by tightening the threaded engagement of said stress bolt therewith prior to the securing of said form panel to said stress bolt, said stress bolt remaining in axially substantially fixed position with respect to said concrete mass during said generation of pre-stress.
Claim 3
Dependent Claim
27 words
A method as defined in claim 1, wherein said stress bolt is placed in greater axial threaded interengagement with said anchor rod than is said dummy bolt.
Claim 4
Dependent Claim
19 words
A method as defined in claim 1, wherein said dummy bolt and stress bolt have similar inner end configuration.
Claim 5
Dependent Claim
25 words
A method as defined in claim 1, wherein form structure is rested on said stress bolt exclusively adjacent the face of the said concrete mass.
References Cited (Backward Citations)
US2967343A
Cited
US3355529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |