Patent EP0146126A2 successfully refreshed from Google Patents.
EP0146126A2
Expired / Lapsed
EP
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A prestressed concrete member obtained by post tensioning
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1984-12-14
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Granted: —
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Expires: 2004-12-14
Abstract
Abstract Steel materials for use with concrete that is prestressed by posttensioning are disclosed. in accordance with one embodiment of the invention, a steel member is sheathed with a heat-shrinkable synthetic resin tube. in another embodiment, the steel member is sheathed with a foamed synthetic resin tube. Both embodiments are further applicable to the case of a stranded steel member, in which case it is preferred that the spiral grooves of the stranded member be filled with a resin before sheathing with an external tube.
Inventors
- 👤 Kanji C/O Itami Works Of Sumitomo Watanabe
- 👤 Mikio C/O Itami Works Of Sumitomo Mizoe
- 👤 Eiji C/O Itami Works Of Sumitomo Inoo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 21:52
CPC Classifications
D; D07; D07B; D07B1/00; D07B1/16; D07B1/162; E; E04; E04C; E04C5/00; E04C5/08; D07B2501/00; D07B2501/20; D07B2501/2015; D07B2501/2023
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
22 words
A steel material for use with prestressed concrete, comprising: a steel member, and a foamed synthetic resin tube sheathing said steel member.
Claim 2
Dependent Claim
22 words
A steel material for use with prestressed concrete, comprising: a steel member, and a foamed synthetic resin tube sheathing said steel member.
Claim 3
Dependent Claim
18 words
The steel material of claim 1, wherein a wall thickness of said tube is at least 300 microns.
Claim 4
Dependent Claim
14 words
The steel material of claim 1, wherein a wall thickness at least 500 microns.
Claim 5
Dependent Claim
15 words
The steel material of claim 1, wherein said synthetic resin is a foamed polyethylene tube.
Claim 6
Dependent Claim
31 words
The steel material of claim 1, wherein said synthetic resin tube is formed by applying a synthetic resin powder containing a blowing agent to a surface of said steel member preheated.
Claim 7
Dependent Claim
44 words
The steel material of claim 1, wherein said synthetic resin tube is formed by applying a film of synthetic resin containing a blowing agent to a surface of said steel member and then heating said steel member to expand said resin into a foam.
Claim 8
Dependent Claim
50 words
A steel material for use with prestressed concrete, comprising: a steel strand comprising a plurality of twisted steel wires, said steel strand having a plurality of spiral grooves foamed therein; a resin filling said grooves; and a foamed synthetic resin tube sheathing said strand and said resin filling said grooves.
Claim 9
Dependent Claim
50 words
A steel material for use with prestressed concrete, comprising: a steel strand comprising a plurality of twisted steel wires, said steel strand having a plurality of spiral grooves foamed therein; a resin filling said grooves; and a foamed synthetic resin tube sheathing said strand and said resin filling said grooves.
Claim 10
Dependent Claim
24 words
A steel material for use with prestressed concrete, comprising: a steel member, and a synthetic resin tube surrounding outer surfaces of said steel member.
Claim 11
Dependent Claim
24 words
A steel material for use with prestressed concrete, comprising: a steel member, and a synthetic resin tube surrounding outer surfaces of said steel member.
Claim 12
Dependent Claim
17 words
The steel material of claim 1, wherein said synthetic resin tube is made of a heat-shrinkable resin.
Claim 13
Dependent Claim
19 words
The steel material of claim 2, wherein a wall thickness of said resin tube is at least 300 microns.
Claim 14
Dependent Claim
13 words
The steel material of claim 3, wherein said resin material is a polyolefin.
Claim 15
Dependent Claim
13 words
The steel material of claim 3, wherein said resin is a high-density polyethylene.
Claim 16
Dependent Claim
59 words
A steel material for use with prestressed concrete, comprising: a steel strand comprising a plurality of steel wires twisted together, said steel strand having spiral grooves; a resin filling said grooves; and a heat-shrinkable synthetic resin tube covering said strand and said resin and heat-shrunk around said strand to provide intimate contact between said strand and said resin tube.
Claim 17
Dependent Claim
59 words
A steel material for use with prestressed concrete, comprising: a steel strand comprising a plurality of steel wires twisted together, said steel strand having spiral grooves; a resin filling said grooves; and a heat-shrinkable synthetic resin tube covering said strand and said resin and heat-shrunk around said strand to provide intimate contact between said strand and said resin tube.
References Cited (Backward Citations)
No citation records indexed.
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