JPH01301230A - Unbond processing method for pc steel rod - Google Patents
Unbond processing method for pc steel rodInfo
- Publication number
- JPH01301230A JPH01301230A JP30840687A JP30840687A JPH01301230A JP H01301230 A JPH01301230 A JP H01301230A JP 30840687 A JP30840687 A JP 30840687A JP 30840687 A JP30840687 A JP 30840687A JP H01301230 A JPH01301230 A JP H01301230A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- steel rod
- unbond
- length
- shrinkable tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 9
- 239000010959 steel Substances 0.000 title claims abstract description 9
- 238000003672 processing method Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract 3
- 239000000463 material Substances 0.000 claims abstract 2
- 239000012467 final product Substances 0.000 abstract 1
- 238000013022 venting Methods 0.000 abstract 1
- 238000003466 welding Methods 0.000 abstract 1
- 239000011513 prestressed concrete Substances 0.000 description 1
Landscapes
- Reinforcement Elements For Buildings (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
PURPOSE:To achieve the perfect unbond up to the screw part of the contact part with concrete and to provide no heat-shrinkable tube at the unbond unnecessary part of the screw part, by a method wherein the heat-shrinkable tube is external fitted to a PC steel rod to be temporarily welded at the position of the screw part of the end part thereof and the whole is subsequently shrink under heating. CONSTITUTION:The length l1' of a heat-shrinkable tube 2 through which a PC steel rod 1 is inserted is, for example, 1,900mm and made longer by 30mm than the length l1 of a final product. This heat-shrinkable tube 2 is positioned so that the length l4 from the left end part of the PC steel rod 1 is 85mm and the length l5 from the right end part thereof is 15mm. Next, the heat-shrinkable tubes A, B positioned above screw parts 12 are temporarily welded. At this time, either one of them is not perfectly welded and a gap for venting air is partially provided to perform temporary welding. Thereafter, when the whole is inserted in a band heater to be shrunk under heating, the shrinkage in the longitudinal direction receives the resistance by the unevenness of the screw parts to be prevented from development but the tube on a base material parallel part 1 is shrunk in the diameter direction to be closely bonded thereto and an unbond PC steel rod is obtained.
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は下水道、地下道等に用いられるプレストレスト
コンクリート措造物に使用されるＰＣ鋼棒のアンボンド
加工方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for unbonding PC steel bars used in prestressed concrete structures used in sewers, underground passages, etc.
（発明の背景）(Background of the invention)
Claims (1)
ンド加工方法において、ＰＣ鋼棒上に熱収縮チューブを
挿通した後、端部のネジ部の位置で熱収縮チューブを仮
溶着し、しかる後全体を加熱収縮せしめることを特徴と
するＰＣ鋼棒のアンボンド加工方法。(1) In the method of unbonding a PC steel bar using a heat-shrinkable tube as a covering material, the heat-shrinkable tube is inserted onto the PC steel bar, and then the heat-shrinkable tube is temporarily welded at the threaded portion of the end. A method for unbonding a PC steel bar, which is characterized by heating and shrinking the entire back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30840687A JPH01301230A (en) | 1987-12-05 | 1987-12-05 | Unbond processing method for pc steel rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30840687A JPH01301230A (en) | 1987-12-05 | 1987-12-05 | Unbond processing method for pc steel rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01301230A true JPH01301230A (en) | 1989-12-05 |
Family
ID=17980678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30840687A Pending JPH01301230A (en) | 1987-12-05 | 1987-12-05 | Unbond processing method for pc steel rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01301230A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020111989A (en) * | 2019-01-15 | 2020-07-27 | 鹿島建設株式会社 | Joining structure of concrete reinforcement member, anchorage zone structure of concrete reinforcement member and joining method for concrete reinforcement member |
| CN112709136A (en) * | 2020-11-24 | 2021-04-27 | 中铁二局集团有限公司 | Grouting device for prestress tensioning and grouting method thereof |
-
1987
- 1987-12-05 JP JP30840687A patent/JPH01301230A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020111989A (en) * | 2019-01-15 | 2020-07-27 | 鹿島建設株式会社 | Joining structure of concrete reinforcement member, anchorage zone structure of concrete reinforcement member and joining method for concrete reinforcement member |
| CN112709136A (en) * | 2020-11-24 | 2021-04-27 | 中铁二局集团有限公司 | Grouting device for prestress tensioning and grouting method thereof |
| CN112709136B (en) * | 2020-11-24 | 2022-08-12 | 中铁二局集团有限公司 | Grouting device for prestress tensioning and grouting method thereof |
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