US3864776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prestressed post tension suspension bridge cable anchorage
Assignee: Parsons Brinckerhoff Quade and Douglas Inc
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Filing: 1973-11-15
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Granted: 1975-02-11
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Expires: 1993-11-15
Abstract
Abstract By prestressing a suspension bridge cable anchorage at a bearing plate and tensioning the cable strands at different points on the bearing plate, savings in the mass of concrete or scope of anchor rod in rock is obtained, saving labor and material. The anchorage is adapted to different cable strand configurations and facilitates suspension bridge construction and cable anchorage.
Inventors
- 👤 Alfred Hedefine
- 👤 Louis G Silano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:10
CPC Classifications
E; E01; E01D; E01D19/00; E01D19/14; E01D11/00; E01D11/02
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
161 words
In a suspension bridge a cable anchorage construction comprising an anchorage mass, a cable, said cable including at least one cable strand, a bearing plate apposed to said cable, at least one rod opening in said bearing plate, at least one rod, said at least one rod gripped at least at one of its ends remote from said bearing plate, the other end of said at least one rod extending through at least one bearing plate opening, means to fasten said at least one extending rod held bearing upon said bearing plate, means bearing upon said bearing plate to hold said at least one said cable strand, tightening means including said bearing plate and said at least one rod to stress said cable anchor mass, means clear of said at least one rod held bearing upon said bearing plate to retain at least one cable strand, and means to tension said at least one cable strand against said anchorage mass''s stress.
Claim 2
Dependent Claim
161 words
In a suspension bridge a cable anchorage construction comprising an anchorage mass, a cable, said cable including at least one cable strand, a bearing plate apposed to said cable, at least one rod opening in said bearing plate, at least one rod, said at least one rod gripped at least at one of its ends remote from said bearing plate, the other end of said at least one rod extending through at least one bearing plate opening, means to fasten said at least one extending rod held bearing upon said bearing plate, means bearing upon said bearing plate to hold said at least one said cable strand, tightening means including said bearing plate and said at least one rod to stress said cable anchor mass, means clear of said at least one rod held bearing upon said bearing plate to retain at least one cable strand, and means to tension said at least one cable strand against said anchorage mass''s stress.
Claim 3
Dependent Claim
11 words
The invention of claim 1 wherein said anchorage mass is bedrock.
Claim 4
Dependent Claim
17 words
The invention of claim 2 wherein said at least one rod is held fastened in said bedrock.
Claim 5
Dependent Claim
21 words
The invention of claim 3 wherein said bedrock is stressed by tightening said at least one rod against said bearing plate.
Claim 6
Dependent Claim
30 words
The invention of claim 4 wherein said means to hold said cable strand includes means to orient said holding means to the splay of said at least one cable strand.
Claim 7
Dependent Claim
17 words
The invention of claim 5 wherein said means to hold said cable strand includes a protective cover.
Claim 8
Dependent Claim
12 words
The invention of claim 1 wherein said anchorage mass is substantially concrete.
Claim 9
Dependent Claim
35 words
The invention of claim 7 including a frame, a front bearing plate, a rear bearing plate, at least one anchor cylinder and at least one held rod bearing upon said front and rear bearing plate.
Claim 10
Dependent Claim
27 words
The invention of claim 8 wherein said front and rear bearing plates include at least one sleeve, said at least one anchor cylinder held by said sleeve.
Claim 11
Dependent Claim
16 words
The invention of claim 9 wherein said sleeve and at least one anchor cylinder are threaded.
Claim 12
Dependent Claim
48 words
The invention of claim 10 wherein said rear bearing plate includes at least one opening for at least one rod, said front bearing plate includes at least one opening for at least one rod and at least another opening for means to hold at least one cable strand.
Claim 13
Dependent Claim
29 words
The invention of claim 11 wherein said concrete mass is stressed by tightening said at least one rod against said concrete mass between said front and rear bearing plates.
Claim 14
Dependent Claim
31 words
The invention of claim 12 wherein said at least one cable strand is spun on a shoe, said shoe held to said front bearing plate by at least one stud bolt.
Claim 15
Dependent Claim
24 words
The invention of claim 13 wherein said at least one stud bolt is held to said front bearing plate by a rounded bottom nut.
Claim 16
Dependent Claim
13 words
The invention of claim 14 wherein said nut rests in a rounded washer.
Claim 17
Dependent Claim
29 words
The invention of claim 15 wherein said opening in said bearing plate for said cable strand holding means is flared outward to the face of said front bearing plate.
Claim 18
Dependent Claim
17 words
The invention of claim 12 wherein said at least one cable is prefabricated and includes a socket.
Claim 19
Dependent Claim
16 words
The invention of claim 17 wherein said socket is held by at least one stud bolt.
Claim 20
Dependent Claim
24 words
The invention of claim 18 wherein said at least one stud bolt is held to said front bearing plate by a rounded bottom nut.
Claim 21
Dependent Claim
13 words
The invention of claim 19 wherein said nut rests in a rounded washer.
Claim 22
Dependent Claim
29 words
The invention of claim 20 wherein said opening in said bearing plate for said cable strand holding means is flared outward to the face of said front bearing plate.
Claim 23
Dependent Claim
11 words
The invention of claim 17 wherein said socket is T shaped.
Claim 24
Dependent Claim
27 words
The invention of claim 17 including a shoe having at least one U-shaped channel wider than said strand and having a socket wider than said U-shaped channel.
Claim 25
Dependent Claim
21 words
The invention of claim 8 wherein said bearing plate includes at least one beam adapted to interact with said bearing plate.
Claim 26
Dependent Claim
90 words
The invention of claim 24 wherein said beam includes a front flange and a rear flange And support means, at least one U channel in its front and rear flanges adapted to receive at least one rod at said front flange, means to hold said at least one rod on said front flange, at least one intermediate flange having a U channel apposed to a U channel in said front flange, and at least one cable strand narrower than said U channel with a socket wider than said U channel.
Claim 27
Dependent Claim
20 words
The invention of claim 25 wherein said means to hold said at least one rod includes at least one fill.
Claim 28
Dependent Claim
11 words
The invention of claim 26 further including at least one shim.
Claim 29
Dependent Claim
15 words
The invention of claim 27 wherein said at least one shim includes a U channel.
Claim 30
Dependent Claim
14 words
The invention of claim 28 wherein said at least one cable strand is prefabricated.
Claim 31
Dependent Claim
24 words
The invention of claim 29 wherein said cable strand includes at least one socket having a rounded portion facing the length of said strand.
Claim 32
Dependent Claim
17 words
The invention of claim 29 wherein said at least one socket is mounted in a rounded washer.
Claim 33
Dependent Claim
25 words
The invention of claim 31 wherein said rounded washer is split into more than one piece and adapted to be held together by a keeper.
Claim 34
Dependent Claim
14 words
The invention of claim 23 wherein said socket mounting includes at least one fill.
Claim 35
Dependent Claim
11 words
The invention of claim 33 further including at least one shim.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |