EP0129976A2
Expired / Lapsed
EP
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Improvements in tendons for post-tensioned pre-stressed concrete structures
Assignee: PSC FREYSSINET Ltd
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Filing: 1984-05-18
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Granted: —
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Expires: 2004-05-18
Abstract
Abstract A tendon for post-tensioned prestressed concrete structures in which between the strand and sheath there is provided, in quiescent condition, a latent hardenable material and an activator therefor so that when the strand is tensioned the activator is activated to commence the hardening process of the hardenable material and produce a bonded tendon.
Inventors
- 👤 Alan James Harris
- 👤 Gordon Ernest Ronald Wright
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 04:56
CPC Classifications
E; E04; E04C; E04C5/00; E04C5/08; E04C5/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
73 words
A tendon for use in a post-tensioned pre-stressed concrete structure, comprising a high tensile steel strand (as herein defined) encased in a protective metal sheath, there being provided in quiescent condition between the strand and sheath a material having a latent hardening property and an activator therefor, the arrangement being such that by the strand being moved in relation to the sheath the activator is activated to induce hardening of the hardenable material.
Claim 2
Dependent Claim
73 words
A tendon for use in a post-tensioned pre-stressed concrete structure, comprising a high tensile steel strand (as herein defined) encased in a protective metal sheath, there being provided in quiescent condition between the strand and sheath a material having a latent hardening property and an activator therefor, the arrangement being such that by the strand being moved in relation to the sheath the activator is activated to induce hardening of the hardenable material.
Claim 3
Dependent Claim
24 words
A tendon as claimed in Claim 1, in which by movement of the strand the hardenable material is released into contact with the activator.
Claim 4
Dependent Claim
31 words
A tendon as claimed in either Claim 1 or Claim 2, in which the hardenable material is, in its quiescent condition, encapsulated in a myriad of small capsules around the strand.
Claim 5
Dependent Claim
33 words
A tendon as claimed in Claim 3, in which the encapsulated hardenable material is suspended in a carrier which may be a solvent, mixed with a liquid activator and applied around the strand.
Claim 6
Dependent Claim
31 words
A tendon as claimed in Claim 4, in which the hardenable material is an epoxy resin, the solvent is toluene or a halogenated hydrocarbon and the activator is an aliphatic amine.
Claim 7
Dependent Claim
19 words
A tendon as claimed in Claim 5, in which the epoxy resin is a Bisphenol 'A' emulsion in water.
Claim 8
Dependent Claim
16 words
A tendon as claimed in Claim 6, in which the encapsulation material is an epoxy resin.
Claim 9
Dependent Claim
30 words
A tendon as claimed in Claim 1, in which the activator is, in its quiescent condition, held in micro-capsules carried by a sheet of material wrapped helically around the strand.
Claim 10
Dependent Claim
47 words
A tendon as claimed in any one of the preceding claims, in which the sheath is helically formed with interlocking or lapped edges which extend inwardly to near the strand, the edges promoting activation of the activator on movement of the strand in relation to the sheath.
Claim 11
Dependent Claim
19 words
A tendon for use in post-tensioned pre-stressed concrete structures substantially as herein described with reference to the accompanying drawing.
Claim 12
Dependent Claim
19 words
A tendon for use in post-tensioned pre-stressed concrete structures substantially as herein described with reference to the accompanying drawing.
Claim 13
Dependent Claim
19 words
A post-tensioned pre-stressed concrete structure having at least one tendon as claimed in any one of the preceding claims.
References Cited (Backward Citations)
No citation records indexed.
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