Patent US5447593A successfully refreshed from Google Patents.
US5447593A
Expired / Lapsed
US
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Method for reinforcing concrete structures
Assignee: Obayashi Corp
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Filing: 1994-04-18
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Granted: 1995-09-05
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Expires: 2014-04-18
Abstract
Abstract A method for reinforcing a concrete structure is disclosed in which the steps of (a) applying to a long fiber prepreg an adhesive, (b) attaching on the surface of the concrete structure the long fiber prepreg with the adhesive interposed between the surface of the concrete structure and the long fiber prepreg, and (c) curing the thermosetting resin at an ambient temperature are performed. The long fiber prepreg has as a matrix a thermosetting resin with a curing temperature of 70° C. or above. The adhesive has a curing temperature of from 10° to 40° C., and accelerates the curing of the thermosetting resin impregnated in the long fiber prepreg.
Inventors
- 👤 Tuneo Tanaka
- 👤 Kensuke Yagi
- 👤 Tokitaro Hoshijima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:04
CPC Classifications
E; E04; E04C; E04C5/00; E04C5/07; E04C3/00; E04C3/02; E04C3/29; E04G; E04G23/00; E04G23/02; E04G23/0218; E04G23/0225; E04G2023/0251; Y; Y10; Y10S; Y10S52/00; Y10S52/07
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
102 words
A method for reinforcing a concrete structure, comprising applying to a long fiber prepreg an adhesive having a curing temperature of from 10° to 40° C., said long fiber prepreg having as a matrix a thermosetting resin with a curing temperature of 70° C. or above, attaching on the surface of said concrete structure the long fiber prepreg with the adhesive interposed between said surface of said concrete structure and said long fiber prepreg, and curing the thermosetting resin at an ambient temperature with the adhesive, wherein said adhesive accelerates the curing of said thermosetting resin impregnated in said long fiber prepreg.
Claim 2
Independent Claim
102 words
A method for reinforcing a concrete structure, comprising applying to a long fiber prepreg an adhesive having a curing temperature of from 10° to 40° C., said long fiber prepreg having as a matrix a thermosetting resin with a curing temperature of 70° C. or above, attaching on the surface of said concrete structure the long fiber prepreg with the adhesive interposed between said surface of said concrete structure and said long fiber prepreg, and curing the thermosetting resin at an ambient temperature with the adhesive, wherein said adhesive accelerates the curing of said thermosetting resin impregnated in said long fiber prepreg.
Claim 3
Dependent Claim
24 words
A method according to claim 1, wherein said long fiber is selected from the group consisting of glass fiber, carbon fiber, and ARAMIDE fiber.
Claim 4
Dependent Claim
16 words
A method according to claim 1, wherein the base for said adhesive is an epoxy resin.
Claim 5
Dependent Claim
17 words
A method according to claim 3, wherein said epoxy resin is a bisphenol A type epoxy resin.
Claim 6
Dependent Claim
17 words
A method according to claim 3 or 4, wherein said adhesive further comprises an amine curing agent.
Claim 7
Dependent Claim
29 words
A method according to claim 1, wherein said adhesive is dissolved in a solvent to have its viscosity of 6,000 cp or below at a temperature of 23° C.
Claim 8
Dependent Claim
18 words
A method according to claim 1, wherein said prepreg has a thickness from about 0.1 to 2 mm.
Claim 9
Dependent Claim
28 words
A method according to claim 1, wherein said adhesive is applied to said prepreg within one hour prior to attaching said prepreg to said surface to be reinforced.
Claim 10
Dependent Claim
36 words
A method according to claim 1, wherein said adhesive is applied to said prepreg in an amount in a range of from 10 g to 200 g, with respect to 1 m 2 of said prepreg.
Claim 11
Dependent Claim
19 words
A method according to claim 9, wherein said amount of said adhesive is from 20 g to 100 g.
Claim 12
Dependent Claim
36 words
A method according to claim 8, wherein said adhesive is applied to said prepreg in an amount in a range of from 10 g to 200 g, with respect to 1 m 2 of said prepreg.
Claim 13
Dependent Claim
19 words
A method according to claim 11, wherein said amount of said adhesive is from 20 g to 100 g.
Claim 14
Dependent Claim
21 words
A method according to claim 1, wherein said curing is conducted at a temperature of from 10° C. to 40° C.
Claim 15
Dependent Claim
21 words
A method according to claim 8, wherein said curing is conducted at a temperature of from 10° C. to 40° C.
Claim 16
Dependent Claim
26 words
A method according to claim 1, wherein said structural element of concrete is selected from the group consisting of a pier, chimney, column, beam and slab.
Claim 17
Dependent Claim
16 words
A method according to claim 15, wherein said structural element of concrete is a concrete chimney.
Claim 18
Dependent Claim
16 words
A method according to claim 15, wherein said structural element of concrete is a concrete column.
References Cited (Backward Citations)
US2850890A
Cited
US3111569A
Cited
FR1451643A
Cited
US3765972A
Cited
DE2909179A1
Cited
US4451317A
Cited
EP0206591A2
Cited
FR2594871A1
Cited
US5308430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-09-04 | 1999-03-06 | 1999-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-04 | 2003-03-06 | 2003-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-04 | 2007-03-06 | 2007-09-05 | $7700.00 | Window Closed / Lapsed |