JP3696608B2 - Rust prevention method for PC steel - Google Patents
Rust prevention method for PC steel Download PDFInfo
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- JP3696608B2 JP3696608B2 JP2003344094A JP2003344094A JP3696608B2 JP 3696608 B2 JP3696608 B2 JP 3696608B2 JP 2003344094 A JP2003344094 A JP 2003344094A JP 2003344094 A JP2003344094 A JP 2003344094A JP 3696608 B2 JP3696608 B2 JP 3696608B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 58
- 239000010959 steel Substances 0.000 title claims description 58
- 238000000034 method Methods 0.000 title claims description 44
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims description 30
- 230000002265 prevention Effects 0.000 title claims description 24
- 239000000463 material Substances 0.000 claims description 42
- 239000004567 concrete Substances 0.000 claims description 38
- 239000011440 grout Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000005871 repellent Substances 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 3
- 239000011443 resin grout Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000004078 waterproofing Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
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- Bridges Or Land Bridges (AREA)
- Building Environments (AREA)
- Reinforcement Elements For Buildings (AREA)
Description
本発明は、特にＰＣ鋼材の防錆方法に関するものである。 The present invention particularly relates to a method for preventing rust of PC steel.
従来より、橋梁等において、プレストレストコンクリート（以下、「ＰＣコンクリート」）が利用されている。特に、長径間においては多用されている。ＰＣコンクリートは、ＰＣ鋼材を緊張することにより、コンクリートに生じる引張応力をうち消すものである。 Conventionally, prestressed concrete (hereinafter, “PC concrete”) has been used in bridges and the like. In particular, it is frequently used between major axes. PC concrete eliminates the tensile stress generated in concrete by tensioning PC steel.
したがって、ＰＣコンクリートにおいて最も大きな問題は、ＰＣ鋼材の錆びによる破断である。当該破断の影響は、鉄筋が破断した場合の影響よりも大きい。ＰＣ鋼材は、シース内に挿通され、強アルカリ性であるグラウトにより覆われているので、本来錆びないはずである。グラウト重点の不完全、コンクリートのひび割れ、水止めの問題、定着部からの水の流入等により、ＰＣ鋼材が破断することは少なくない。 Therefore, the biggest problem in PC concrete is breakage of PC steel due to rust. The effect of the break is greater than the effect when the reinforcing bar breaks. Since the PC steel is inserted into the sheath and covered with a strong alkaline grout, it should not rust. PC steel materials often break due to incomplete grout emphasis, cracks in concrete, water stoppage problems, water inflow from the anchorage, and the like.
斯かる破断防止策として、種々の技術が開発提供されている。 Various techniques have been developed and provided as measures for preventing such breakage.
解決しようとする問題点は、ＰＣ鋼材の発錆による破断を完全に防止できない点である。 The problem to be solved is that PC steel cannot be completely prevented from being broken by rusting.
請求項１記載の発明はＰＣ鋼材の防錆方法であって、前記ＰＣ鋼材が挿通されるシース同士を、熱収縮シートにより接続し、ＰＣ桁内部でのＰＣ鋼材の曲げ上げ角度を２０度以下となるように前記シースを配置し、前記ＰＣ鋼材の定着が、前記ＰＣ桁の鉛直面又は下面となるようにし、前記ＰＣ鋼材を樹脂製の前記シースに挿通し、前記定着には防錆処理された定着具を用い、該定着具には樹脂製のグラウトキャップを装着し、該グラウトキャップを装着した前記定着具に後埋めコンクリートを打ち、該後埋めコンクリートを防水処理及び撥水処理すると共に、前記ＰＣ桁の縁部上面に余盛を設けた上で、前記ＰＣ桁上面の雨水等が桁端部から支承部に流出しないよう、前記後埋めコンクリートと前記余盛を連続して覆い、下端が前記ＰＣ桁の下面端部よりも下方に位置するように水止めコンクリートを打設し、前記ＰＣ桁上から前記ＰＣ鋼材の定着部までの水道を迂回させると共に、前記水止めコンクリートの内部から前記桁内部にまで至る、橋軸方向に延在する止水板を設け、グラウトの先流れを防止しながら、ＰＣ鋼材への水道を可能な限り絶ち、その発錆を防止することを特徴とするＰＣ鋼材の防錆方法に存する。
請求項２記載の発明は、桁上面の打ち継目に防水シートを設け、その後に、前記水止めコンクリートを打設することを特徴とする請求項１に記載の、ＰＣ鋼材の防錆方法に存する。
請求項３記載の発明は、径間中央部、前記ＰＣ桁内部で前記ＰＣ鋼材が上方に位置する部分には、予め防水処理及び撥水処理を行うことを特徴とする請求項１又は２のいずれかに記載の、ＰＣ鋼材の防錆方法に存する。
請求項４記載の発明は、前記シースのグラウトは、ノンブリージングコンクリートであることを特徴とする請求項１乃至３のいずれかに記載の、ＰＣ鋼材の防錆方法に存する。
請求項５記載の発明は、前記シースへのグラウチィングは、前記ＰＣ桁のコンクリートを打設する前に行う、プレグラウチィングであることを特徴とする請求項１乃至４のいずれかに記載の、ＰＣ鋼材の防錆方法に存する。
請求項６記載の発明は、請求項１乃至５のいずれかに記載のＰＣ鋼材の防錆方法により構築されたＰＣ桁に存する。
The invention according to claim 1 is a rust prevention method for PC steel material, wherein the sheaths through which the PC steel material is inserted are connected by a heat shrink sheet, and the bending angle of the PC steel material inside the PC girder is 20 degrees or less. The sheath is arranged so that the PC steel material is fixed on the vertical surface or the lower surface of the PC girder, the PC steel material is inserted into the resin sheath, and the fixing is rust-proofed. using the fuser member, with the fixing device equipped with a grout cap made of resin, the filled out a concrete post grout cap to the fixing device mounted and waterproofing and water-repellent treatment of concrete filled rear In addition, after providing a surplus on the upper surface of the edge of the PC girder, the backfill concrete and the surplus are continuously covered so that rainwater or the like on the upper surface of the PC girder does not flow out from the end of the girder to the support. The lower end is the PC girder Water-stopping concrete is placed so as to be positioned below the lower end, and the water from the PC girder to the fixing portion of the PC steel material is bypassed, and from the inside of the water-blocking concrete to the inside of the girder. The PC steel material is characterized by providing a water stop plate that extends in the direction of the bridge axis, cutting the water supply to the PC steel material as much as possible and preventing its rusting while preventing the forward flow of the grout. It lies in the rust method.
According to a second aspect of the invention, a waterproof sheet to hit the seam digit top provided, then, according to claim 1, characterized in that the pouring the water stop concrete, it consists in anticorrosive method of PC steel .
According to a third aspect of the invention, span the middle portion, the PC girder inside the PC steel material in a portion located above, according to
A fourth aspect of the present invention resides in the rust prevention method for PC steel according to any one of the first to third aspects, wherein the sheath grout is non-breathing concrete.
The invention according to claim 5 is the pre-grouting according to any one of claims 1 to 4 , wherein the grouting to the sheath is pre-grouting performed before placing the concrete of the PC girder. It exists in the rust prevention method of PC steel materials.
Invention of
本発明のＰＣ鋼材の防錆方法は、ＰＣ鋼材への水道を可能な限り絶ち、発錆を防止するという利点がある。 The PC steel material rust prevention method of the present invention has an advantage that water supply to the PC steel material is cut as much as possible to prevent rusting.
以下、本発明の実施例に係るＰＣ鋼材の防錆方法について図面を用いて説明する。 Hereinafter, the rust prevention method of PC steel materials concerning the example of the present invention is explained using a drawing.
まず、図１乃至図３に示すように、ＰＣ鋼材が挿通されるシース１，１同士を、熱収縮シート２により接続する。
First, as shown in FIGS. 1 to 3, the sheaths 1 and 1 through which the PC steel material is inserted are connected by a
次いで、図４に示すように、ＰＣ桁内部でのＰＣ鋼材（図４において図示略）の曲げ上げ角度を２０度以下となるようにシース１を配置する。
また、ＰＣ鋼材の定着が、ＰＣ桁の鉛直面又は下面となるようにシース１を配置する。すなわち、図５に示すような鉛直締めをやめることにより、桁コンクリートＣと後埋めコンクリートＡとの間から雨水等が進入しないようにするため、並びに、図６に示すようにグラウトが入りにくい部分が生じないようにする為である。
次いで、通常の方法により、定着し、ＰＣ鋼材を樹脂製のシース１に挿通し、グラウチィングを行う。定着には防錆処理された定着具を用いる。
次いで、定着後、図７に示すように定着具に樹脂製のグラウトキャップ３を装着する。
次いで、グラウトキャップ３を装着した定着具に、通常の通り後埋めコンクリートＡを打つ（図示略）。
次いで、後埋めコンクリートＡを防水・撥水処理する。防水・撥水処理は、既存技術で行えばよい（図示略）。
以上の工程により、ＰＣ鋼材の発錆をほぼ完全に防止できるＰＣ桁を構築することが出来る。
なお、図７に示すように、ＰＣ桁の上面の雨水等が桁端部から支承部に流出しないように水止めコンクリート４を打つことが好ましい。
また、図８に示すように、ＰＣ桁の上面の打ち継目に防水シートＳを設けることもできる。
また、図９に示すように、後埋めコンクリートＡを覆うように水止めコンクリート４を形成することもできる。
また、図１０に示すように、水止めコンクリート４’の下端が、ＰＣ桁の下面端部よりも下方に位置するように形成することも出来る。
また、図１１に示すように、ＰＣ桁の縁部上面には、余盛５を設けることもできる。４”は水止めコンクリートである。
また、図１２に示すように、水止めコンクリート４’の内部から、桁内部にまで至る、橋軸方向に延在する止水板６を設けることもできる。
また、ひび割れが生じやすい部分には、予め防水・撥水処理を行うことが好ましい。ひび割れが生じやすい部分とは、例えば、径間中央部、ＰＣ桁内部でＰＣ鋼材が上方に位置する部分等である。
また、シース１のグラウトは、ノンブリージングコンクリートであることが好ましい。
また、シース１へのグラウチィングは、ＰＣ桁のコンクリートを打設する前に行う、プレグラウチィングであることが好ましい。プレグラウチィングの方法については、本出願人が既に開発提供している発明である（特開２００１−０３０２２６号）。概説すると、シース１が配設された鉄筋へ仮設された型枠にコンクリートを打設する前に、コンクリートのＰＣ鋼材の緊張に要する強度が発現する時間よりも長い硬化時間を有するＰＣグラウトをシース１内へ注入し、充填されたか否かを確認し、充填されていない場合には再びＰＣグラウトを注入しシース１は、内部に注入された前記ＰＣグラウトを目視可能な透明度を有し、シース１内へグラウトが充填されたか否かをシース１の外側から目視により確認する技術である。
なお、同一構成物には、同一符号を付している。
Next, as shown in FIG. 4, the sheath 1 is arranged so that the bending angle of the PC steel material (not shown in FIG. 4) inside the PC girder is 20 degrees or less.
Further, the sheath 1 is arranged so that the PC steel material is fixed on the vertical surface or the lower surface of the PC girder. That is, by stopping the vertical tightening as shown in FIG. 5, in order to prevent rainwater or the like from entering between the girder concrete C and the backfill concrete A, and a portion where the grout is difficult to enter as shown in FIG. This is to prevent this from occurring.
Next, fixing is performed by a normal method, and the PC steel material is inserted into the resin sheath 1 to perform grouting. For fixing, a rust-proof fixing tool is used.
Next, after fixing, a
Next, post-embedded concrete A is applied to the fixing tool with the
Next, the post-fill concrete A is subjected to a waterproof / water-repellent treatment. The waterproof / water-repellent treatment may be performed by existing technology (not shown).
By the above steps, a PC girder that can almost completely prevent rusting of the PC steel material can be constructed.
In addition, as shown in FIG. 7, it is preferable to hit the water-stopping
Moreover, as shown in FIG. 8, the waterproof sheet S can also be provided in the joint of the upper surface of PC girder.
Moreover, as shown in FIG. 9, the
Moreover, as shown in FIG. 10, it can also form so that the lower end of water-stopping concrete 4 'may be located below the lower surface edge part of a PC girder.
In addition, as shown in FIG. 11, extra bank 5 can be provided on the upper surface of the edge of the PC girder. 4 "is water blocking concrete.
Moreover, as shown in FIG. 12, a
Moreover, it is preferable to perform a waterproof / water-repellent treatment in advance on the portion where the crack is likely to occur. The portion where cracks are likely to occur is, for example, the center portion of the span, the portion where the PC steel material is located above in the PC girder, and the like.
The grout of the sheath 1 is preferably non-breathing concrete.
Moreover, it is preferable that the grouting to the sheath 1 is a pre-grouting performed before placing concrete of PC girder. The pregrouting method is an invention already developed and provided by the present applicant (Japanese Patent Laid-Open No. 2001-030226). In general, before placing concrete on a formwork temporarily installed on a reinforcing bar in which the sheath 1 is disposed, the PC grout having a hardening time longer than the time required to develop the strength required for tension of the concrete PC steel material is sheathed. 1 is injected, and it is confirmed whether or not it is filled. If it is not filled, the PC grout is injected again, and the sheath 1 has transparency so that the PC grout injected therein can be visually observed. In this technique, it is visually confirmed from the outside of the sheath 1 whether or not the grout is filled in the inside.
In addition, the same code | symbol is attached | subjected to the same structure.
本発明は、特に、ＰＣ鋼材の破断を限りなく零にすることができるＰＣ鋼材の防錆方法に利用することができる。 In particular, the present invention can be used in a rust prevention method for PC steel that can eliminate the breakage of PC steel as much as possible.
Ａ 後埋めコンクリート
Ｃ 桁コンクリート
Ｓ 防水シート
１ シース
２ 熱収縮シート
３ グラウトキャップ
４，４’，４” 水止めコンクリート
５ 余盛
６ 止水板
A Back-filled concrete C Girder concrete S Tarpaulin 1
Claims (6)
前記ＰＣ鋼材が挿通されるシース同士を、熱収縮シートにより接続し、
ＰＣ桁内部でのＰＣ鋼材の曲げ上げ角度を２０度以下となるように前記シースを配置し、
前記ＰＣ鋼材の定着が、前記ＰＣ桁の鉛直面又は下面となるようにし、前記ＰＣ鋼材を樹脂製の前記シースに挿通し、
前記定着には防錆処理された定着具を用い、
該定着具には樹脂製のグラウトキャップを装着し、
該グラウトキャップを装着した前記定着具に後埋めコンクリートを打ち、
該後埋めコンクリートを防水処理及び撥水処理すると共に、
前記ＰＣ桁の縁部上面に余盛を設けた上で、前記ＰＣ桁上面の雨水等が桁端部から支承部に流出しないよう、前記後埋めコンクリートと前記余盛を連続して覆い、下端が前記ＰＣ桁の下面端部よりも下方に位置するように水止めコンクリートを打設し、前記ＰＣ桁上から前記ＰＣ鋼材の定着部までの水道を迂回させると共に、前記水止めコンクリートの内部から前記桁内部にまで至る、橋軸方向に延在する止水板を設け、グラウトの先流れを防止しながら、ＰＣ鋼材への水道を可能な限り絶ち、その発錆を防止する
ことを特徴とするＰＣ鋼材の防錆方法。 A method for preventing rust of PC steel,
The sheaths through which the PC steel material is inserted are connected by a heat shrink sheet ,
The sheath is arranged so that the bending angle of the PC steel inside the PC girder is 20 degrees or less,
The fixing of the PC steel material is a vertical surface or a lower surface of the PC girder, and the PC steel material is inserted into the resin sheath,
For fixing, use a rust-proof fixing tool,
The fixing device is equipped with a resin grout cap,
Post-embedded concrete is cast on the fixing device equipped with the grout cap,
The rear filled concrete as well as waterproof and water-repellent treatment,
Covering the backfill concrete and the surplus continuously so that rainwater or the like on the top surface of the PC girder does not flow out from the end of the girder to the support after providing a surplus on the upper surface of the edge of the PC girder, Is placed below the lower end of the PC girder so that the water-stopping concrete is placed, bypassing the water from the PC girder to the fixing portion of the PC steel material, and from the inside of the water-stopping concrete. A water stop plate extending in the direction of the bridge axis extending to the inside of the girder is provided, and water flow to the PC steel material is cut off as much as possible to prevent rusting while preventing forward flow of the grout. A method for rust prevention of PC steel material.
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| JP2003344094A JP3696608B2 (en) | 2003-10-02 | 2003-10-02 | Rust prevention method for PC steel |
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| JP2003344094A JP3696608B2 (en) | 2003-10-02 | 2003-10-02 | Rust prevention method for PC steel |
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| JP6366537B2 (en) * | 2015-04-21 | 2018-08-01 | 株式会社ライテク | Manufacturing methods for sheds and precast beams |
| JP7164943B2 (en) * | 2017-10-16 | 2022-11-02 | 住友電気工業株式会社 | Joint error adjustment mechanism and joint |
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