JPS63217017A - Prevention of corrosion of anchor - Google Patents
Prevention of corrosion of anchorInfo
- Publication number
- JPS63217017A JPS63217017A JP4533187A JP4533187A JPS63217017A JP S63217017 A JPS63217017 A JP S63217017A JP 4533187 A JP4533187 A JP 4533187A JP 4533187 A JP4533187 A JP 4533187A JP S63217017 A JPS63217017 A JP S63217017A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- anchor
- head
- anchor head
- cylinder
- 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.)
- Granted
Links
- 230000007797 corrosion Effects 0.000 title claims abstract description 11
- 238000005260 corrosion Methods 0.000 title claims abstract description 11
- 230000002265 prevention Effects 0.000 title 1
- 230000001681 protective effect Effects 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 abstract description 7
- 239000007924 injection Substances 0.000 abstract description 7
- 238000010276 construction Methods 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- SMARLDCRQUMZJR-UHFFFAOYSA-N 2-hydroxy-2-(2,3,4,5,6-pentachlorophenyl)acetonitrile Chemical compound N#CC(O)C1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl SMARLDCRQUMZJR-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Piles And Underground Anchors (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、ＰＣ構造物やグランドアンカーに使用するア
ンカーケーブルの腐食を防止する方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for preventing corrosion of anchor cables used in PC structures and ground anchors.
〈従来の技術〉
アンカーは大きな力によってケーブルを引っ張っている
。<Conventional technology> An anchor pulls a cable with great force.
したがって長い年月が経過しても、設計時通りの応力に
対応できる必要があり、そのためにはケーブルの腐食を
防止することが大切である。Therefore, even after many years have passed, it is necessary to be able to handle the stress as designed, and to this end, it is important to prevent cable corrosion.
ところが従来のアンカーの実績を検討すると、アンカー
の歴史の古いヨーロッパにおいてはアンカーヘッド付近
での破損が最も多く発生していることが知られている。However, when examining the track record of conventional anchors, it is known that in Europe, where anchors have a long history, most breakages occur near the anchor head.
たとえば国際プレストレストコンクリート連盟による１
９８６年の報告書によれば、アンカーケーブルの腐食に
よる破損例３５件の中でその破損位置がアンカーヘッド
付近であったものが１９件をしめているのである。For example, 1 according to the International Prestressed Concrete Federation.
According to the 1986 report, out of 35 cases of damage to anchor cables due to corrosion, 19 of them were located near the anchor head.
その理由は、第５図に示すような構造のアンヵ−ヘッド
の場合に、ＰＣＩＡＲＰの周囲を覆っているシースＡの
終端とアンカーヘッドＨとの間には防錆オイルＢの充填
が困難であることから空気にさらされた空間部Ｃが発生
してしまう。The reason for this is that in the case of an anchor head with a structure as shown in Fig. 5, it is difficult to fill the space between the end of the sheath A that covers the PCIARP and the anchor head H with anti-rust oil B. As a result, a space C exposed to air is generated.
その状態のまま長い年月を経過するとそのうちＰＣｊｌ
Ｊ線Ｐが空間部Ｃの付近から腐食するのが原因であると
考えられる。If a long time passes in this state, the PCjl
It is thought that the cause is that the J line P corrodes from the vicinity of the space C.
こうした事実から、アンカーヘッド付近の腐食の防止措
置を十分に行えば相当の数の破損を阻止できることがわ
かる。These facts show that if adequate measures are taken to prevent corrosion near the anchor head, a significant number of failures can be prevented.
さらに保護筒りの内径と、アンカーヘッドＨの外径が近
いから、保護筒り内部にオイルを完全に充填しておくと
、ちょうどオイルが充填したピストンのシリンダー側を
押し付けるようなもので、人の力では支圧板まで確実に
セットすることが不可能である。Furthermore, since the inside diameter of the protective cylinder and the outside diameter of the anchor head H are close, if the inside of the protective cylinder is completely filled with oil, it will be like pressing the cylinder side of a piston filled with oil. It is impossible to securely set up to the bearing pressure plate with this force.
そのために多少の空間を残したオイルを保護筒に充填し
て押し付けるような作業をしているために、セットした
後には保護筒の内部にオイルの不足した空間Ｃ２が発生
してしまい、この内部の空気もＰＣ鋼線を腐食させる原
因となっている。For this purpose, the protective cylinder is filled with oil and pressed against it, leaving some space, so after it is set, a space C2 lacking oil is created inside the protective cylinder. The air also causes corrosion of the PC steel wire.
く本発明の目的〉
本発明はこのような点を改善するためになされたもので
、アンカーヘッドの露出した外側はもちろん、その内部
のｐｃｍｎの腐食を防止することができる、アンカーの
腐食防止方法を提供することを目的とする。OBJECTS OF THE INVENTION The present invention has been made to improve these points, and provides a method for preventing corrosion of anchors, which can prevent corrosion of not only the exposed outside of the anchor head but also the PCMN inside the anchor head. The purpose is to provide
また本発明はグランドアンカーや、橋Ｒ、Ｐ Ｃ建築構
造物においてその頭部の防錆のためにも使用できるアン
カーの腐食防止方法を提供することを目的とする。Another object of the present invention is to provide a method for preventing corrosion of ground anchors and anchors that can be used to prevent rust on the heads of bridges and PC building structures.
〈本発明の構成〉 つぎに本発明の実施例について説明する。<Configuration of the present invention> Next, embodiments of the present invention will be described.
〈イ〉全体の構成
支圧板１に反力をとり、アンカーヘッド２を介してＰＣ
ｍ線Ｐに引っ張り力を与える構成は従来と同様である。<A> Overall configuration A reaction force is taken on the bearing plate 1, and the PC is transferred via the anchor head 2.
The configuration for applying a tensile force to the m-line P is the same as the conventional one.
アンカーヘッド２とｐｃｍ線Ｐの終端部分は外部に露出
して雨風にさらされるから、保護筒４を被せて保護して
やる必要がある。Since the anchor head 2 and the terminal end of the PCM wire P are exposed to the outside and exposed to rain and wind, it is necessary to protect them by covering them with a protective tube 4.
く口〉保護筒の構造
保護筒４は一端を開放した円錐台形の筒体であって、そ
の開放端の周囲には鍔板４１を突設しである。Structure of the protective cylinder The protective cylinder 4 is a truncated conical cylinder with one end open, and a flange plate 41 is protruded around the open end.
鍔板４１には、保護筒４を支圧板１に取り付けるための
ネジ穴を開設する。A screw hole for attaching the protection tube 4 to the bearing plate 1 is provided in the flange plate 41.
そして特に本発明に使用する保護筒４は、その一部にオ
イルの注入孔４２を、またその他の位置には排気孔４３
を設ける。In particular, the protection tube 4 used in the present invention has an oil injection hole 42 in a part thereof, and an exhaust hole 43 in the other position.
will be established.
注入孔４２には外部からの注入ホースを結合したときに
簡単に接続できる公知の構造を採用する。The injection hole 42 adopts a known structure that allows easy connection when an external injection hose is connected.
一方排気孔４３にはネジを設けたプラグ４４を解体自在
に取り付ける。On the other hand, a plug 44 provided with a screw is attached to the exhaust hole 43 in such a manner that it can be disassembled freely.
く使用方法〉
つぎに本発明の保護筒４の使用方法を、垂直下向きのア
ンカーに使用した場合について説明する。How to Use> Next, the method of using the protective tube 4 of the present invention will be described in the case where it is used for a vertically downward anchor.
くイ〉オイルの充填（第１図）
上記の保護筒４の開口部を上方にむけた状態にして、そ
の内部に防錆オイル５を充填する。Filling with oil (Fig. 1) With the opening of the protective cylinder 4 facing upward, the inside thereof is filled with anti-rust oil 5.
次に保護筒４の開放側を下にしてアンカーヘッド２の上
から被せるが、このオイル５は一般に粘性の大きいもの
を採用しているから開放側を下にしても水のようにすぐ
に流れ出してしまうことはない。Next, cover the anchor head 2 with the open side of the protection tube 4 facing down, but since this oil 5 is generally of high viscosity, it will flow out like water even if the open side is facing down. It won't happen.
その結果第２図のようにアンカーヘッド２とＰｃｍ線Ｐ
の外周にはオイル５が充填されることになる。As a result, as shown in Figure 2, the anchor head 2 and Pcm line P
The outer periphery of is filled with oil 5.
しかしアンカーヘッド２よりも内部の空間６はオイルが
充填されることがな（、空気にさらされたままである。However, the space 6 inside the anchor head 2 is not filled with oil (and remains exposed to air).
さらに保護筒４の内部にも空気が存在している場合がお
おく、オイル５が完全に保護筒４内に充填されていない
場合もある。Furthermore, there are many cases where air is present inside the protection tube 4, and there are cases where the protection tube 4 is not completely filled with oil 5.
く口〉オイルの加圧注入（第３図）
そこで保護筒４の排気孔４３のプラグ４４をいったん取
り除き、一方性入孔４２からは加圧状態のオイルを保護
筒４内に注入する。Injection of oil under pressure (FIG. 3) The plug 44 of the exhaust hole 43 of the protection cylinder 4 is removed once, and pressurized oil is injected into the protection cylinder 4 through the one-sided inlet hole 42.
すると内部の余分の空気が排気孔４３から外部に排出さ
れるのでそこからオイルが吐き出されてきたらプラグ４
４をねしこんで蓋をする。Then, the excess air inside will be discharged to the outside from the exhaust hole 43, so if oil is discharged from there, close the plug 4.
Pour in Step 4 and cover.
〈ハ〉オイルの追加注入（第４図） この状態でさらにオイルを注入する。<C> Additional injection of oil (Fig. 4) In this state, add more oil.
すると保護筒４内部にはオイル５が充填されているから
、追加のオイル５はアンカーヘッド２のくさび孔２１を
通ってアンカーヘッド２よりも内部に進入してゆく。Then, since the inside of the protective cylinder 4 is filled with oil 5, the additional oil 5 passes through the wedge hole 21 of the anchor head 2 and enters inside the anchor head 2.
その結果アンカーヘッド２よりも内部の空間６がオイル
で充填される。As a result, the space 6 inside the anchor head 2 is filled with oil.
く二〉他の実施例
以上の方法は、まず保護筒４の開口部を上向きにしてオ
イル５を充填してからアンカーヘッド２に被せる方法に
ついて説明したが、保護筒４内部にはオイル５を充填せ
ず、保護筒４をアンカーヘッド２に被覆した後に始めて
オイル５を注入孔４２から注入し、内部に充填する方法
を採用することもできる。2〉Other Examples In the above method, first, the opening of the protection tube 4 is turned upward and oil 5 is filled, and then the anchor head 2 is covered with the oil 5. It is also possible to adopt a method in which the oil 5 is injected from the injection hole 42 only after the anchor head 2 is covered with the protective cylinder 4, and the oil 5 is filled into the interior without being filled.
く本発明の効果〉
本発明は上記したような構造の保護筒を使用するから、
従来の施工方法では充填がほとんど不可能であったアン
カーヘッドよりも奥のアンカ一孔内にオイルを充填する
ことができるようになった。Effects of the present invention> Since the present invention uses a protective tube having the structure described above,
It is now possible to fill the hole in the anchor deeper than the anchor head, which was almost impossible using conventional construction methods.
そのために海外のアンカーの破損事例で一番発生率の多
かったｒアンカーヘッド近くの破損」をほぼ完全に阻止
することが可能となり、きわめて安全な施工ができる。This makes it possible to almost completely prevent "breakage near the anchor head," which is the most common cause of anchor breakage overseas, and allows for extremely safe construction.
さらに保護筒をアンカーヘッドに被せる場合に、保護筒
の中のオイルを適当に入れておいても、その後に必要な
だけの量を充填できるからきわめて一良好な完全充填を
することが可能になった。Furthermore, when putting the protective tube over the anchor head, even if you fill the protective tube with an appropriate amount of oil, you can fill it with the required amount afterwards, making it possible to achieve a very good and complete filling. Ta.
第１図〜第４図 本発明の施工方法の説明図第５図 従
来の構造の説明図Figures 1 to 4 are explanatory diagrams of the construction method of the present invention. Figure 5 are explanatory diagrams of conventional structures.
Claims (1)
する容積を有する、 一端開放の保護筒を使用し、 アンカーヘッドとＰＣ鋼線の外周に保護筒を被覆し、 その後に保護筒の排気孔を開口して保護筒内にオイルを
加圧状態で注入し、 保護筒内の充填が終了したら排気孔を閉塞した状態でさ
らにオイルを注入し、 アンカーヘッドよりも内部の空間にもオイルを充填する
ことを特徴とする、 アンカーの腐食防止方法[Claims] A protection tube with one end open having a volume that covers the anchor head of the anchor and the exposed PC steel wire is used, and the outer periphery of the anchor head and the PC steel wire is covered with the protection tube, and then Open the exhaust hole of the protective tube and inject oil under pressure into the protective tube. Once the protective tube has been filled, close the exhaust hole and inject more oil to fill the space inside the anchor head. A method for preventing corrosion of anchors, which is characterized by filling the anchor with oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4533187A JPH07116708B2 (en) | 1987-03-02 | 1987-03-02 | How to prevent anchor corrosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4533187A JPH07116708B2 (en) | 1987-03-02 | 1987-03-02 | How to prevent anchor corrosion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63217017A true JPS63217017A (en) | 1988-09-09 |
| JPH07116708B2 JPH07116708B2 (en) | 1995-12-13 |
Family
ID=12716328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4533187A Expired - Fee Related JPH07116708B2 (en) | 1987-03-02 | 1987-03-02 | How to prevent anchor corrosion |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07116708B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013241758A (en) * | 2012-05-18 | 2013-12-05 | Ps Mitsubishi Construction Co Ltd | Method for injecting rust-proofing agent aqueous solution into cavity inside pc tendon insertion sheath in existing pc structure |
| JP2013241761A (en) * | 2012-05-18 | 2013-12-05 | Ps Mitsubishi Construction Co Ltd | Method for injecting rust-proofing agent aqueous solution into cavity inside sealed pc tendon insertion sheath in existing pc structure |
| JP2013241759A (en) * | 2012-05-18 | 2013-12-05 | Ps Mitsubishi Construction Co Ltd | Method for injecting rust-proofing agent aqueous solution into pc tendon fixing portion side sheath end portion having air permeability at pc tendon fixing portion in existing pc structure |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3895637B2 (en) * | 2002-05-20 | 2007-03-22 | 岡部株式会社 | Anchor cap |
-
1987
- 1987-03-02 JP JP4533187A patent/JPH07116708B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013241758A (en) * | 2012-05-18 | 2013-12-05 | Ps Mitsubishi Construction Co Ltd | Method for injecting rust-proofing agent aqueous solution into cavity inside pc tendon insertion sheath in existing pc structure |
| JP2013241761A (en) * | 2012-05-18 | 2013-12-05 | Ps Mitsubishi Construction Co Ltd | Method for injecting rust-proofing agent aqueous solution into cavity inside sealed pc tendon insertion sheath in existing pc structure |
| JP2013241759A (en) * | 2012-05-18 | 2013-12-05 | Ps Mitsubishi Construction Co Ltd | Method for injecting rust-proofing agent aqueous solution into pc tendon fixing portion side sheath end portion having air permeability at pc tendon fixing portion in existing pc structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07116708B2 (en) | 1995-12-13 |
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