JP3817349B2 - Rust preventive cage for anchor bolt and rust preventive method using the same - Google Patents
Rust preventive cage for anchor bolt and rust preventive method using the same Download PDFInfo
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- JP3817349B2 JP3817349B2 JP28125497A JP28125497A JP3817349B2 JP 3817349 B2 JP3817349 B2 JP 3817349B2 JP 28125497 A JP28125497 A JP 28125497A JP 28125497 A JP28125497 A JP 28125497A JP 3817349 B2 JP3817349 B2 JP 3817349B2
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- anchor bolt
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Description
【０００１】
【発明の属する技術分野】
本発明は、アンカーボルトの腐食により構造物の寿命が短縮することを防ぐために用いるアンカーボルト用防錆剤保持器およびそれを用いる防錆方法に関するものである。
【０００２】
【従来の技術】
アンカーボルトは構造物の基礎部分を固定するために用いる重要な部品であり、恒久的にその機能を保持することが望ましいにもかかわらず、従来のものは一般にその部材が露出しており、腐食して変質を起こす問題があった。
そこでアンカーボルトの防錆方法として、近年用いられている方法は、ボルトの露出部に防錆テープを厳重に巻き付け、その上にコート剤を塗布するという労力と資材を要するものである。
【０００３】
また、特開昭５７−７４４１１号公報には、図１に示すように、アンカーボルト１の露出頭部に半流動性の防錆剤２を塗布すると共に、定型材によるキャップ材３を覆着する方法が開示されている。上記キャップ材３としては、合成樹脂材などによって成形されたもの、あるいは可曲性の定型材である防食テープを巻着して形成したものなどが用いられる。しかし、アンカーボルトは呼び径が同一であっても、露出部の長さ（以下「露出長さ」という）が同じではないので、このような定型のキャップ材を用いる場合には、種々の大きさのものを準備しておくことが必要であるため、煩雑でありコスト的にも不利である。そこで、呼び径が同じであれば露出長さが異なるアンカーボルトであっても、個々のアンカーボルトに対応した防錆処理を現場作業において簡便に施工することができる方法が望まれている。
なお、前記特開昭５７−７４４１１号公報に記載された方法では、防錆剤をアンカーボルトの露出部に塗布するのみであり防錆効果が持続せず、施工後にキャップ材を取り外して防錆状況を確認し、必要に応じ反復して防錆剤を塗布しなければならない。しかしながら、施工後に構造物の施工に使用されているアンカーボルトのすべてを定期的に点検し、防錆効果を持続させるために防錆剤を繰り返して塗布することは、実際の作業上極めて労力を要し現実には不可能である。さらに防錆剤はグリース状のものであり、過剰に塗布された防錆剤は周囲温度の上昇によって漏れ出すことがあるが、このような防錆剤の漏洩は安全面においてもきわめて好ましくない。
【０００４】
【発明が解決しようとする課題】
本発明は、上記のような事情に鑑み、比較的安価な部材を使用し、種々の露出長さのアンカーボルトに対応した防錆処理を現場作業において簡便に施工することができ、かつ優れた防錆効果が持続する防錆方法を提供することを目的とするものである。
【０００５】
【問題を解決するための手段】
本発明者らは、上記の目的に沿って鋭意検討を行った結果、アンカーボルトの露出部を覆う防錆剤保持器を上部材と下部材からなる分離型とすることにより、容易に目的を達成し得ることを見出して本発明を完成した。
すなわち、本発明の第１は、アンカーボルトのねじ部上端に螺着可能な袋ナット部の周囲に鍔部を設けてなる上部材、および防錆剤を保持する筒部材とその下端に付与する耐油性パッキンとからなる下部材から構成されることを特徴とするアンカーボルト用防錆剤保持器に関するものである。
また、本発明の第２は、アンカーボルトのねじ部上端に螺着可能な袋ナット部の周囲に鍔部を設けてなる上部材および筒部材と耐油性パッキンとからなる下部材を用い、構造物の基底板上にアンカーボルトと同心円状に、耐油性パッキンを介して筒部材を載置し、アンカーボルトの露出部と筒部材との間隙に防錆剤を充填してアンカーボルトの露出部を防錆剤に埋設し、次いで上部材の袋ナット部をアンカーボルトのねじ部上端に螺着し上部材を下降させて、鍔部の下面により下部材を押圧することを特徴とするアンカーボルトの防錆方法に関するものである。
【０００６】
【発明の実施の形態】
以下、本発明を図面により詳細に説明する。
図２は、本発明の防錆剤保持器を用いてアンカーボルトの防錆方法を実施した状態を示す縦断面図である。アンカーボルト１は基礎６に固定され、構造物の基底板７を貫通して、座金４を介しナット５により基底板７を締め付けている。
本発明の防錆剤保持器は、アンカーボルト１のねじ部上端に螺着した袋ナット部８ａの周囲に鍔部８ｂを設けてなる上部材８、および基底板７の上にアンカーボルト１と同心円状に載置した円筒形の筒部材９とその下端に付与した耐油性パッキン１０とからなる下部材から構成されている。筒部材９に防錆剤２を充填した後、下部材は上部材８により押圧される。この押圧は、アンカーボルト１のねじ部上端に螺着した袋ナット部８ａを下降させることにより達成される。なお、図２には筒部材９が円筒形である例を示したが、防錆剤を保持することができ、上部材８の鍔部８ｂで覆うことが可能であれば、筒部材の断面形状は歪んだ円形や楕円であっても差し支えない。
【０００７】
上部材８としては、アンカーボルト１のねじ部上端に螺着可能な内ねじを設けた袋ナット部８ａの周囲に鍔部８ｂを設けたものをあらかじめ作製しておく。袋ナット部８ａの外形は、通常、締付け工具によって十分締め付けることができるように六角筒形である。袋ナット部８ａの内側はアンカーボルト１の上端を挿入し得るように円筒形であり、内面にアンカーボルト１の外ねじに螺着可能な内ねじが設けられている。鍔部８ｂの形状は通常円板形とし、その直径は下部材の筒部材９の外径よりも大きいことが必要である。これは、座金４がアンカーボルト１の中心からずれていたり、筒部材９が完全な円筒形でない場合等にも、上部材８が筒部材９の上端を完全に被覆することができるようにするためである。
また、鍔部８ｂの外周は、雨水が筒部材９の内部に入らないように、図示のように下側に輪縁８ｃを設けた形状にすることが望ましい。
下部材に用いる筒部材９は、使用する上部材８の鍔部８ｂの内径より小さい外径を有する筒形素材を現場において適宜に切断して、そのまま用いることができる。特殊な加工等は必要でなく、施工がきわめて容易である。
【０００８】
上部材８および筒部材９の材質としては、耐候性および耐油性を有するものであればいずれも用いることができ、上部材８と筒部材９の材質は異なっていてもよい。例えばポリアミド、ポリアセタール、ポリ塩化ビニル、ＡＢＳ樹脂およびポリオレフィンなどが挙げられる。強度や寸法安定性に優れ、かつ安価で汎用性を有するなどの点から、ポリエチレン、ポリプロピレンなどのポリオレフィン系樹脂が好ましい。これらの合成樹脂に無機フィラーを配合したものやガラス繊維を配合したＦＲＰも有用である。
【０００９】
本発明において用いる防錆剤は、特にに限定されるものではなく、一般的に使用されている半流動性のものであればいずれも用いることができる。通常、半流動性の防錆剤を暖めて流動性を高めてから、本発明の防錆剤保持器の下部材に充填する。半流動性の防錆剤としては、油脂系その他のグリース状のものが適宜に採用され、１例としてペトロラタム系のグリース状防錆剤が挙げられる。
【００１０】
上記の防錆剤保持器を用いて施工する本発明の防錆方法は以下の通りである。まず、現場において、アンカーボルト１の露出長さを考慮し、筒形素材を適宜に切断して筒部材９を作製する。構造物の基底板７の上にアンカーボルト１と同心円状に、耐油性パッキン１０を介して筒部材９を載置し、適当な位置に静止させた状態でアンカーボルト１の露出部と筒部材９との間隙に防錆剤２を充填する。筒部材９の内部を観察しながら充填することにより、防錆剤２を容易に所定の位置まで充填することができる。次に上部８の袋ナット部８ａをアンカーボルト１のねじ部上端に螺着して下降させ、鍔部８ｂの下面により下部材を押圧して耐油性パッキン１０を締め付け、防錆剤２の漏洩を防止する。
【００１１】
【実施例】
以下、実施例により本発明を具体的に説明するが、本発明はこれにより限定されるものではない。
図２に示すように、基礎に固定したＭ２４アンカーボルト（呼び径２４ｍｍ）により、ダブルナットを用いて基底板を締め付けた。筒部材としては、外径６０ｍｍ、肉厚１.５ｍｍのポリエチレン製の円筒形素材を、アンカーボルトの露出長さよりも１５ｍｍ短い長さに相当する９０ｍｍに切断して用いた。上部材としては、六角筒形の袋ナット部の最大外径３６ｍｍおよび円板形鍔部の外径７０ｍｍのポリエチレン製のものを用いた。
上記筒部材の下端に耐油性パッキンを付与して、基底板上にアンカーボルトと同心円状に載置し、アンカーボルトの露出部と筒部材との間隙に、加温して流動性を高めた防錆剤を円筒形部材の上端から５ｍｍの位置まで充填した。次いで、アンカーボルトのねじ部上端に袋ナット部を螺着して上部材を下降させ、鍔部の下面により下部材を押圧して耐油性パッキンを締め付け、防錆剤の漏洩を防止した。
上記のようにして得られた防錆剤保持器の下部から防錆剤の漏洩は見られなかった。３ヶ月後、上部材を取り外し、筒部材の内部および下部からの漏洩の有無を再度確認したが、防錆剤は充填時の状態で保持されており、漏洩はなかった。
【００１２】
【発明の効果】
本発明の防錆剤保持器を用いたアンカーボルトの防錆方法は以下の効果を示す。
（１）本発明の防錆剤保持器は、アンカーボルトの露出長さが異なる場合にも、現場における寸法合わせにより作製することができる。
（２）上部材は袋ナット部の螺着により固定されているため、上部材を容易に取り外して防錆剤の保持状態およびアンカーボルトの点検を行うことができる。
（３）本発明の防錆剤保持器における筒部材は、耐油性パッキンを介して基底板に押圧されているために、防錆剤が漏洩することがないので、一旦充填した防錆剤の効果は永続する。
（４）防錆テープやコート剤、あるいは特定形状の保護部材を種々用意する必要はなく、容易かつ安価にアンカーボルトの防錆処理を行うことができる。
【図面の簡単な説明】
【図１】従来のアンカーボルトの防錆方法を示す縦断面図である。
【図２】本発明の防錆剤保持器を用いたアンカーボルトの防錆方法を示す縦断面図である。
【符号の説明】
１ アンカーボルト
２ 防錆剤
３ キャップ材
４ 座金
５ ナット
６ 基礎
７ 基底板
８ 上部材
８ａ 袋ナット部
８ｂ 鍔部
８ｃ 輪縁
９ 筒部材
１０ 耐油性パッキン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anchor bolt rust inhibitor retainer used for preventing the life of a structure from being shortened due to corrosion of anchor bolts, and a rust prevention method using the same.
[0002]
[Prior art]
Anchor bolts are an important part used to fix the foundation of a structure. Despite the desirability of retaining its function permanently, conventional bolts are generally exposed and corroded. And there was a problem that caused alteration.
Therefore, as a rust prevention method for anchor bolts, a method used in recent years requires labor and materials for wrapping an anticorrosion tape tightly around an exposed portion of the bolt and applying a coating agent thereon.
[0003]
JP-A-57-74411 discloses that a semi-fluid rust inhibitor 2 is applied to an exposed head of an anchor bolt 1 and a cap material 3 is coated with a fixed material as shown in FIG. A method is disclosed. As the cap material 3, one formed by a synthetic resin material or the like, or one formed by winding an anticorrosion tape that is a bendable fixed material is used. However, even though the anchor bolts have the same nominal diameter, the length of the exposed portion (hereinafter referred to as “exposed length”) is not the same. Since it is necessary to prepare such a thing, it is complicated and disadvantageous in terms of cost. Therefore, there is a demand for a method capable of simply applying a rust prevention treatment corresponding to each anchor bolt in the field work even if the anchor bolts have different exposed lengths if the nominal diameter is the same.
In the method described in JP-A-57-74411, the rust preventive agent is merely applied to the exposed portion of the anchor bolt, and the rust preventive effect is not maintained. Check the situation and repeat the rust inhibitor as necessary. However, regularly checking all anchor bolts used in the construction of structures after construction and applying rust inhibitor repeatedly to maintain the rust prevention effect is extremely labor intensive in actual work. In short, it is impossible in reality. Further, the rust preventive agent is in the form of a grease, and the excessively applied rust preventive agent may leak out due to an increase in the ambient temperature. However, such leakage of the rust preventive agent is extremely undesirable in terms of safety.
[0004]
[Problems to be solved by the invention]
In view of the circumstances as described above, the present invention uses a relatively inexpensive member, and can easily perform rust prevention treatment corresponding to anchor bolts of various exposed lengths in field work, and is excellent. An object of the present invention is to provide a rust-preventing method that maintains the rust-preventing effect.
[0005]
[Means for solving problems]
As a result of diligent investigations along the above-mentioned purpose, the present inventors can easily achieve the object by making the rust preventive retainer covering the exposed portion of the anchor bolt a separate type consisting of an upper member and a lower member. The present invention has been completed by finding what can be achieved.
That is, the first of the present invention is applied to the upper member formed with a flange around the cap nut portion that can be screwed to the upper end of the screw portion of the anchor bolt, the cylindrical member that holds the rust preventive agent, and the lower end thereof. The present invention relates to a rust preventive cage for anchor bolts, characterized in that it is composed of a lower member made of oil-resistant packing.
The second of the present invention uses an upper member provided with a flange around a cap nut portion that can be screwed to the upper end of the screw portion of the anchor bolt, and a lower member comprising a cylindrical member and an oil-resistant packing. The cylindrical member is placed on the base plate of the object concentrically with the anchor bolt via an oil-resistant packing, and the exposed portion of the anchor bolt is filled with a rust preventive agent in the gap between the exposed portion of the anchor bolt and the cylindrical member. Embedded in a rust preventive agent, and then the upper nut of the upper member is screwed to the upper end of the threaded portion of the anchor bolt, the upper member is lowered, and the lower member is pressed by the lower surface of the collar portion. It relates to the rust prevention method.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 2 is a longitudinal sectional view showing a state in which the rust prevention method for the anchor bolt is carried out using the rust inhibitor retainer of the present invention. The anchor bolt 1 is fixed to the base 6, passes through the base plate 7 of the structure, and fastens the base plate 7 with a nut 5 via a washer 4.
The rust inhibitor retainer of the present invention includes an upper member 8 provided with a flange portion 8b around a cap nut portion 8a screwed to the upper end of the screw portion of the anchor bolt 1, and the anchor bolt 1 on the base plate 7. It is comprised from the lower member which consists of the cylindrical cylinder member 9 mounted concentrically, and the oil-resistant packing 10 provided to the lower end. After filling the cylindrical member 9 with the rust inhibitor 2, the lower member is pressed by the upper member 8. This pressing is achieved by lowering the cap nut portion 8a screwed to the upper end of the screw portion of the anchor bolt 1. FIG. 2 shows an example in which the cylindrical member 9 is cylindrical. However, if the rust preventive agent can be held and can be covered with the flange portion 8b of the upper member 8, the cross section of the cylindrical member is shown. The shape may be a distorted circle or ellipse.
[0007]
As the upper member 8, a member provided with a collar portion 8 b around a cap nut portion 8 a provided with an internal screw that can be screwed to the upper end of the screw portion of the anchor bolt 1 is prepared in advance. The outer shape of the cap nut portion 8a is usually a hexagonal cylinder so that it can be sufficiently tightened by a tightening tool. The inner side of the cap nut portion 8a is cylindrical so that the upper end of the anchor bolt 1 can be inserted, and an inner screw that can be screwed to the outer screw of the anchor bolt 1 is provided on the inner surface. The shape of the flange portion 8b is usually a disc shape, and the diameter thereof needs to be larger than the outer diameter of the cylindrical member 9 as the lower member. This enables the upper member 8 to completely cover the upper end of the cylindrical member 9 even when the washer 4 is displaced from the center of the anchor bolt 1 or when the cylindrical member 9 is not completely cylindrical. Because.
Further, it is desirable that the outer periphery of the flange portion 8b has a shape in which a ring edge 8c is provided on the lower side as illustrated so that rainwater does not enter the inside of the cylindrical member 9.
The cylindrical member 9 used for the lower member can be used as it is by appropriately cutting a cylindrical material having an outer diameter smaller than the inner diameter of the flange portion 8b of the upper member 8 to be used. No special processing is required and construction is very easy.
[0008]
Any material can be used as the material of the upper member 8 and the cylindrical member 9 as long as they have weather resistance and oil resistance, and the material of the upper member 8 and the cylindrical member 9 may be different. Examples thereof include polyamide, polyacetal, polyvinyl chloride, ABS resin, and polyolefin. Polyolefin resins such as polyethylene and polypropylene are preferred from the viewpoints of excellent strength and dimensional stability, low cost and versatility. FRPs in which inorganic fillers are blended with these synthetic resins or glass fibers are also useful.
[0009]
The anticorrosive agent used in the present invention is not particularly limited, and any semi-fluidic agent generally used can be used. Usually, after the semi-fluid rust inhibitor is warmed to improve fluidity, the lower member of the rust inhibitor holder of the present invention is filled. As the semi-fluid rust preventive agent, an oil-based or other grease-like one is appropriately adopted, and an example is a petrolatum-based grease-like rust preventive agent.
[0010]
The rust prevention method of the present invention to be constructed using the above rust inhibitor retainer is as follows. First, in consideration of the exposed length of the anchor bolt 1 at the site, the tubular member 9 is produced by appropriately cutting the tubular material. A cylindrical member 9 is placed on the base plate 7 of the structure concentrically with the anchor bolt 1 via an oil-resistant packing 10 and is kept stationary at an appropriate position. 9 is filled with the rust preventive agent 2. By filling while observing the inside of the cylindrical member 9, the rust preventive agent 2 can be easily filled to a predetermined position. Next, the cap nut portion 8a of the upper portion 8 is screwed onto the upper end of the threaded portion of the anchor bolt 1 and lowered, and the lower member is pressed by the lower surface of the flange portion 8b to tighten the oil-resistant packing 10 and leak the rust inhibitor 2 To prevent.
[0011]
【Example】
EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto.
As shown in FIG. 2, the base plate was tightened using a double nut with an M24 anchor bolt (nominal diameter: 24 mm) fixed to the foundation. As the cylindrical member, a polyethylene cylindrical material having an outer diameter of 60 mm and a wall thickness of 1.5 mm was cut into 90 mm corresponding to a length 15 mm shorter than the exposed length of the anchor bolt. As the upper member, a polyethylene member having a maximum outer diameter of 36 mm of a hexagonal cylindrical cap nut part and an outer diameter of 70 mm of a disk-shaped collar part was used.
Oil-resistant packing was applied to the lower end of the cylindrical member, and it was placed concentrically with the anchor bolt on the base plate, and the fluidity was improved by heating the gap between the exposed portion of the anchor bolt and the cylindrical member. A rust inhibitor was filled up to a position of 5 mm from the upper end of the cylindrical member. Next, the cap nut was screwed onto the upper end of the threaded portion of the anchor bolt to lower the upper member, and the lower member was pressed by the lower surface of the flange to tighten the oil-resistant packing, thereby preventing leakage of the rust preventive agent.
Leakage of the rust preventive agent was not observed from the lower part of the rust preventive cage obtained as described above. Three months later, the upper member was removed, and the presence or absence of leakage from the inside and the lower portion of the cylindrical member was checked again. However, the rust inhibitor was retained in the state of filling, and there was no leakage.
[0012]
【The invention's effect】
The anchor bolt rust prevention method using the rust inhibitor retainer of the present invention exhibits the following effects.
(1) The rust inhibitor retainer of the present invention can be produced by on-site dimension matching even when the exposed lengths of the anchor bolts are different.
(2) Since the upper member is fixed by screwing the cap nut portion, the upper member can be easily removed to check the holding state of the rust inhibitor and the anchor bolt.
(3) Since the cylinder member in the rust preventive retainer of the present invention is pressed against the base plate via the oil-resistant packing, the rust preventive agent does not leak, so The effect lasts.
(4) There is no need to prepare various rust preventive tapes, coating agents, or protective members having specific shapes, and the anchor bolts can be rust-proofed easily and inexpensively.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a conventional anchor bolt rust prevention method.
FIG. 2 is a longitudinal sectional view showing a rust prevention method for an anchor bolt using the rust inhibitor retainer of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Anchor bolt 2 Rust preventive agent 3 Cap material 4 Washer 5 Nut 6 Base 7 Base plate 8 Upper member 8a Cap nut part 8b Gutter part 8c Ring edge 9 Cylindrical member 10 Oil-resistant packing
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28125497A JP3817349B2 (en) | 1997-09-29 | 1997-09-29 | Rust preventive cage for anchor bolt and rust preventive method using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28125497A JP3817349B2 (en) | 1997-09-29 | 1997-09-29 | Rust preventive cage for anchor bolt and rust preventive method using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11100842A JPH11100842A (en) | 1999-04-13 |
| JP3817349B2 true JP3817349B2 (en) | 2006-09-06 |
Family
ID=17636517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28125497A Expired - Fee Related JP3817349B2 (en) | 1997-09-29 | 1997-09-29 | Rust preventive cage for anchor bolt and rust preventive method using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3817349B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005213335A (en) * | 2004-01-28 | 2005-08-11 | Nisshoku Corp | Method for charging grease and anchor-tightening member used in the method |
| JP5601973B2 (en) * | 2010-10-29 | 2014-10-08 | 大和製衡株式会社 | Gate fastening structure |
| CN105714819B (en) * | 2016-03-31 | 2017-09-12 | 中国水利水电科学研究院 | A kind of outer anchor head multi-protective device of prestress anchorage cable and its fixing means |
| JP2018138742A (en) * | 2017-02-24 | 2018-09-06 | スリーエム イノベイティブ プロパティズ カンパニー | Coating structure, coating method and coating member |
| CN106968246A (en) * | 2017-03-16 | 2017-07-21 | 长安大学 | A kind of composite anchorage for FRP muscle |
| CN109882492B (en) * | 2018-12-12 | 2023-12-01 | 金华八达集团有限公司科技信息分公司 | Rust-proof protective sleeve for foundation bolt of power transmission tower |
-
1997
- 1997-09-29 JP JP28125497A patent/JP3817349B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11100842A (en) | 1999-04-13 |
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