JP2014055420A - Repair method of corroded anchor bolt fixation base - Google Patents
Repair method of corroded anchor bolt fixation base Download PDFInfo
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- JP2014055420A JP2014055420A JP2012199797A JP2012199797A JP2014055420A JP 2014055420 A JP2014055420 A JP 2014055420A JP 2012199797 A JP2012199797 A JP 2012199797A JP 2012199797 A JP2012199797 A JP 2012199797A JP 2014055420 A JP2014055420 A JP 2014055420A
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- 238000010276 construction Methods 0.000 description 43
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- 238000005260 corrosion Methods 0.000 description 17
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
- E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
- E01F9/658—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by means for fixing
- E01F9/673—Upright bodies, e.g. marker posts or bollards; Supports for road signs characterised by means for fixing for holding sign posts or the like
- E01F9/685—Subsoil means, e.g. foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Foundations (AREA)
Abstract
Description
本発明は、腐食したアンカーボルト定着基礎の補修工法に関する。 The present invention relates to a method for repairing a corroded anchor bolt fixing foundation.
過去の震災では、標識・照明柱等の転倒が確認されている。かかる転倒した標識・照明柱等の構造物は、一般に、そのベースプレートが、基礎コンクリートに埋設された既設アンカーボルトにナットにより固定された耐震構造設計されたものである。過去の震災事例を検討した結果、標識、照明柱等の構造物は、上載荷重が小さく最小結合構造であるため、震度に対し自由面が多く、応力拡散がたわみで受けられる構造であるため、剛結構造の定着部(アンカー固定)が設計どおりであれば、基礎部のコンクリート構造物が健全である限り、将来予想される地震に対して耐えられることが判明した。 In the past earthquake disasters, signs and lighting pillars have been confirmed to fall. Such a structure such as an overturned sign / illuminating column is generally designed to have an earthquake resistant structure in which a base plate is fixed to an existing anchor bolt embedded in a foundation concrete with a nut. As a result of reviewing past earthquake disaster cases, structures such as signs and lighting columns have a small mounting load and a minimum coupling structure, so there are many free surfaces with respect to seismic intensity, and stress diffusion can be received by deflection. It has been found that if the anchoring part (anchor fixing) of the rigid structure is as designed, it can withstand future earthquakes as long as the foundation concrete structure is healthy.
そこで、既設アンカーボルトが健全であるかが問題となる。アンカーボルトは一般に鋼製であるため、設置環境下、長年の使用に伴い腐食や割れが発生する。一般に、かかる健全性の確認は、目視・打音確認や、例えば、DAB−1アンカーボルト腐食量測定装置(中日本ハイウェイ・エンジニアリング東京株式会社)を用いた腐食調査により行われている。 Therefore, it is a problem whether the existing anchor bolt is healthy. Since anchor bolts are generally made of steel, corrosion and cracking occur with long-term use in the installation environment. In general, the soundness is confirmed by visual inspection, hammering sound confirmation, or a corrosion investigation using, for example, a DAB-1 anchor bolt corrosion amount measuring device (Nakanippon Highway Engineering Tokyo Co., Ltd.).
かかる腐食や割れは、図1に示すように、構造物のベースプレートと基礎コンクリートの境界面での断面欠損、ベースプレート内部での断面欠損、ベースプレートの基礎コンクリートの境界面での割れ等である。
既存アンカーボルトが健全でないことが確認された場合には、該アンカーボルト定着基礎を補修する必要がある。
Such corrosion and cracking are, as shown in FIG. 1, a cross-sectional defect at the interface between the base plate and the foundation concrete of the structure, a cross-sectional defect inside the base plate, a crack at the interface between the base plate and the foundation concrete, and the like.
When it is confirmed that the existing anchor bolt is not healthy, it is necessary to repair the anchor bolt fixing foundation.
かかる補修工法としては、既存工法であるカプラー接続工法が知られている。以下、図2〜9を参照して、既存工法を説明する。
図2と図3に示すように、既設アンカーボルトに腐食胞性箇所がある場合には、既設アンカーボルトを図3に示す箇所で切断する。図4に示す基礎コンクリートの所定箇所を、簡易的なコンクリート破砕機、例えば、電動ピックで、取壊す(はつりする)。図5に示すように、所定の位置で既設アンカーボルトを切断し、図6に示すように、腐食が進行している場合には必要に応じて、ねじ切りクリップにより、ねじ切りを切り直した後、図7に示すように、両端内部にメスネジを切った接続カプラーを取り付ける。その後、図8に示すように、はつり部分に無収縮モルタルを間詰めとして充填し、その後、元の構造物のベースプレートを、図9に示すように、接続カプラーに、固定ボルトを取り付けることにより、固定する。
As such a repair method, a coupler connection method which is an existing method is known. Hereinafter, the existing construction method will be described with reference to FIGS.
As shown in FIGS. 2 and 3, when the existing anchor bolt has a corrosive site, the existing anchor bolt is cut at the location shown in FIG. 3. A predetermined portion of the basic concrete shown in FIG. 4 is demolished (suspended) with a simple concrete crusher, for example, an electric pick. As shown in FIG. 5, the existing anchor bolt is cut at a predetermined position, and as shown in FIG. 6, when corrosion is in progress, if necessary, after threading is cut again with a threading clip, As shown in FIG. 7, connecting couplers with female threads cut inside the ends are attached. Then, as shown in FIG. 8, the suspension part is filled with non-shrink mortar as a filling, and then the base plate of the original structure is attached to the connection coupler as shown in FIG. Fix it.
かかるカプラー接続工法は、簡易的な機械で施工でき、簡単な施工で、特殊な工種もなく、人編成を多くすることにより、施工数量を多くすることが可能であり、多少の既設アンカーが不良でも臨機応変に対応することができる等の、施工性での利点がある。また、施工範囲が小さく、防護メガネやマスクを装着していれば作業安全性に優れ、耐候性に優れた材料のみを使用しているため耐久性にも優れ、さらに経済性にも優れている。このように、かかる工法は、既存工法で施工実績があり構造上多少の弱体化はあるものの、施工性、経済性に優れているため、大規模地震等を想定しなければ、問題のない工法であるといえる。
しかしながら、かかる既存工法は、既設アンカーボルトへの機械的接続により引抜き応力を得るものであり、間詰めによる付着力は期待できない。また、将来予想される大規模地震等を想定したとき、既設アンカーボルトの腐食が基礎コンクリートの内部深くまで生じていた場合や、ねじ切り直しをした場合に、接続カプラーによる接続により設計引抜き応力と同程度の応力を、全ての補修箇所に保証することは困難である。
This coupler connection method can be constructed with a simple machine, simple construction, no special type of work, and by increasing the number of personnel, the construction quantity can be increased, and some existing anchors are defective. However, there are advantages in terms of workability, such as being able to respond flexibly. In addition, if the construction range is small and protective glasses or a mask are attached, work safety is excellent, and because only materials with excellent weather resistance are used, durability is excellent and economic efficiency is also excellent. . In this way, this construction method has a construction track record with the existing construction method and has some weakening in the structure, but it is excellent in workability and economy, so if there is no large-scale earthquake, etc., there is no problem You can say that.
However, such an existing method obtains a pulling stress by mechanical connection to an existing anchor bolt, and cannot be expected to have an adhesive force due to the filling. In addition, assuming a large-scale earthquake expected in the future, if the corrosion of the existing anchor bolt occurs deep inside the foundation concrete or if it is re-threaded, it will be the same as the design pull-out stress by connecting with the connecting coupler. It is difficult to guarantee a degree of stress at all repair points.
他の補修工法として、以下の特許文献1に開示される再生アンカーボルト工法が知られている。以下、図10〜16を参照して、かかる再生アンカーボルト工法を説明する。
既設アンカーボルトに腐食胞性箇所がある場合に、既設アンカーボルトを切断することは、前記した既存工法と同様である(図2と図3参照)。
図10に示すように、コアボーリングで所定の深さにのみ最小限のはつりを行う。例えば、既設のアンカーボルト径がD24である場合、取壊し深さは45mmであり、D22の場合、40mmであり、D20の場合、35mmであり、そしてD16の場合、30mmである。図11に示すように、特殊ねじ切り装置(引用文献1の図15の符号70、図18の符号80参照)によりねじ切りを行う。但し、特許文献1には、ねじ切りを行わず、縮径により既設アンカーボルト2に特殊再生アンカーボルト(引用文献1の図6の符合11連結金具参照)を固定する態様も記載されている(引用文献1の図1、図5、図8参照)。かかる固定にも、特殊な圧入装置が使用される(引用文献1の図9の符合30参照)。図12に示すように、ねじ込み(螺合締結)又は縮径による食い込み結合(圧入れ)により、既設アンカーボルトに特殊再生アンカーボルトを接続し、はつり箇所にシール材を注入する。その後、必要により、図14に示すように、特殊パッキンを、特殊再生アンカーボルトに被せ、さらに図15に示すように、ライナープレートを設置する。尚、かかる特殊シールパッキンやライナープレートに代えて、樹脂やモルタルを用いる場合がある(引用文献1の段落0038、図1参照)。その後、図16に示すように、特殊再生アンカーボルトに、構造物のベースプレートを普通ナットにより固定する。
As another repair method, a reconstructed anchor bolt method disclosed in Patent Document 1 below is known. Hereinafter, such a reconstructed anchor bolt method will be described with reference to FIGS.
When the existing anchor bolt has a caustic site, cutting the existing anchor bolt is the same as the existing method described above (see FIGS. 2 and 3).
As shown in FIG. 10, minimum boring is performed only to a predetermined depth by core boring. For example, when the existing anchor bolt diameter is D24, the tearing depth is 45 mm, for D22 it is 40 mm, for D20 it is 35 mm, and for D16 it is 30 mm. As shown in FIG. 11, threading is performed by a special threading device (see reference 70 in FIG. 15 and reference 80 in FIG. 18). However, Patent Document 1 also describes a mode in which a special regenerative anchor bolt (see reference numeral 11 connecting metal fitting in FIG. 6 of Cited Document 1) is fixed to the existing anchor bolt 2 by reducing the diameter without performing thread cutting (quoted). (Refer to FIG. 1, FIG. 5, FIG. 8 in Document 1). A special press-fitting device is also used for such fixing (see
特許文献1に記載された工法は、施工範囲も小さく、防護メガネやマスクを装着していれば作業安全性に優れ、耐候性に優れた材料のみを使用しているため耐久性にも優れ、精密なパーツである特殊再生アンカーボルトを使用することにより完成度は高いものの、施工に複雑で特殊な装置、工種が必要であり、施工性が悪く、経済性が悪い。さらに、特許文献1に記載された工法は、既設アンカーボルトへの機械的接続により引抜き応力を得るものであり、間詰めによる付着力は期待できない。また、かかる機械的接続による引抜き強度は、縮径による食い込み結合(圧入れ)による場合には、保証の限りでない。さらに、将来予想される大規模地震等を想定したとき、既設アンカーボルトの腐食が基礎コンクリートの内部深くまで生じていた場合や、ねじ切り直しをした場合に、特殊再生アンカーボルトによる接続により設計引抜き応力と同程度の応力を、全ての補修箇所に保証することは困難である。さらに、使用する特殊シールパッキンの材質にも拠るが、経年腐食により水が浸透し、既存アンカーボルトの腐食を促進する虞がある。さらに、特殊再生アンカーボルトは特殊なボルトであるため、非常に高価であり、交換は可能であるものの維持管理費が高くなる。 The construction method described in Patent Document 1 has a small construction range, is excellent in work safety if wearing protective glasses and a mask, and is excellent in durability because it uses only materials excellent in weather resistance. Although the completeness is high by using the special reproduction anchor bolt which is a precise part, the construction requires complicated and special equipment and work types, and the workability is poor and the economic efficiency is bad. Furthermore, the construction method described in Patent Document 1 obtains a pulling stress by mechanical connection to an existing anchor bolt, and cannot be expected to have an adhesive force due to filling. Further, the pull-out strength by such mechanical connection is not limited to the guarantee in the case of the bite connection (press-fit) due to the reduced diameter. Furthermore, when a large-scale earthquake expected in the future is assumed, if the corrosion of the existing anchor bolt has occurred deep inside the foundation concrete or if it is re-threaded, the design pull-out stress will be increased by connecting with a special regenerated anchor bolt. It is difficult to guarantee the same level of stress at all repair points. Furthermore, although depending on the material of the special seal packing to be used, there is a possibility that water permeates due to aging corrosion and promotes corrosion of existing anchor bolts. Furthermore, since the special regeneration anchor bolt is a special bolt, it is very expensive and can be replaced, but the maintenance cost becomes high.
このように、いくつかの補修工法は知られているものの、将来予想される大規模地震等を想定したとき、既設アンカーボルトの腐食が基礎コンクリートの内部深くまで生じていた場合であっても設計引抜き応力と同程度の応力を全ての補修箇所に保証することのできるさらなる補修工法を提供する必要性が未だある。 In this way, although some repair methods are known, even when large-scale earthquakes are anticipated in the future, even if the corrosion of existing anchor bolts occurs deep inside the foundation concrete, it is designed. There is still a need to provide further repair methods that can assure all repair locations with stresses comparable to pull-out stresses.
以上の従来技術の問題に鑑み、本発明が解決しようとする課題は、将来予想される大規模地震等を想定したとき、既設アンカーボルトの腐食が基礎コンクリートの内部深くまで生じていた場合であっても設計引抜き応力と同程度の応力を全ての補修箇所に保証することができ、施工性、作業安全性、経済性にも優れるさらなる補修工法を提供することである。 In view of the above problems of the prior art, the problem to be solved by the present invention is a case where the corrosion of the existing anchor bolt has occurred deep inside the foundation concrete, assuming a large-scale earthquake expected in the future. However, it is possible to guarantee a stress equivalent to the design pull-out stress at all repair points, and to provide a further repair method that is excellent in workability, work safety, and economy.
本願発明者らは、前記課題を解決すべく、鋭意検討し実験を重ねた結果、以下の補修工法により、前記課題を解決しうることを見出し、本発明を完成するに至った。
すなわち、本発明は以下の通りのものである。
[1]基礎コンクリートに埋設された既設アンカーボルトの表面露出オネジ部に構造物のベースプレートがナットにより固定されている該構造物の基礎の補修工法であって、以下の工程:
(1)前記既設アンカーボルトの周囲のコンクリートを該表面から所定の深さまで除去して、前記既設アンカーボルトの周囲に円筒状の穴を形成する工程;
(2)前記円筒状の穴の底面から所定の位置で、前記アンカーボルトの上部を切断・除去する工程;
(3)メネジ部を一端側に有する所定長の中空円筒状連結具を、該メネジ部を上方にして、露出した既設アンカーボルトに覆い被せるように、前記円筒状の穴に挿入する工程;
(4)前記円筒状の穴内に樹脂を充填し、硬化させることにより、前記連結具を前記基礎コンクリートに定着させる工程;及び
(5)前記基礎コンクリートに定着した前記連結具のメネジ部に、前記構造物のベースプレートをボルトにより締結固定する工程;
を含む、構造物基礎の補修工法。
As a result of intensive studies and experiments, the inventors of the present application have found that the above problems can be solved by the following repair method, and have completed the present invention.
That is, the present invention is as follows.
[1] A method for repairing the foundation of a structure in which a base plate of the structure is fixed to a surface exposed male thread portion of an existing anchor bolt embedded in the foundation concrete with a nut, and includes the following steps:
(1) removing the concrete around the existing anchor bolt to a predetermined depth from the surface to form a cylindrical hole around the existing anchor bolt;
(2) A step of cutting and removing the upper part of the anchor bolt at a predetermined position from the bottom surface of the cylindrical hole;
(3) A step of inserting a hollow cylindrical connector having a predetermined length having a female thread portion on one end side into the cylindrical hole so that the female thread portion is upward and the exposed existing anchor bolt is covered.
(4) filling the cylindrical hole with a resin and curing the resin to fix the connector to the foundation concrete; and (5) the female screw portion of the connector fixed to the foundation concrete, Fastening the base plate of the structure with bolts;
Structural foundation repair methods including
[2]前記工程(1)に先立ち、前記既設アンカーボルトの表面露出オネジ部を切断・除去する工程をさらに含む、前記[1]に記載の補修工法。 [2] The repair method according to [1], further including a step of cutting and removing a surface exposed male thread portion of the existing anchor bolt prior to the step (1).
[3]前記工程(3)と(4)に代えて、以下の工程:
(3’)前記円筒状の穴内に樹脂を充填する工程;及び
(4’)メネジ部を一端側に有する所定長の中空円筒状連結具を、該メネジ部を上方にして、既設アンカーボルトに覆い被せるように、前記樹脂が充填された円筒状の穴に、挿入し、該樹脂を硬化させて、前記連結具を前記基礎コンクリートに定着させる工程;
を含む、前記[1]又は[2]に記載の補修工法。
[3] Instead of the steps (3) and (4), the following steps:
(3 ′) filling resin into the cylindrical hole; and (4 ′) a hollow cylindrical coupler having a predetermined length having a female thread portion at one end side, and the existing anchor bolt with the female thread portion facing upward. Inserting into the cylindrical hole filled with the resin so as to cover it, curing the resin, and fixing the connector to the foundation concrete;
The repair method according to the above [1] or [2].
[4]前記円筒状の穴の深さが150mm〜400mmである、前記[1]〜[3]のいずれかに記載の補修工法。 [4] The repair method according to any one of [1] to [3], wherein a depth of the cylindrical hole is 150 mm to 400 mm.
[5]前記連結具の外側面と前記円筒状の穴の内側面との隙間が、5mm〜30mmである、前記[1]〜[4]のいずれかに記載の補修工法。 [5] The repair method according to any one of [1] to [4], wherein a gap between an outer surface of the connector and an inner surface of the cylindrical hole is 5 mm to 30 mm.
[6]前記樹脂がエポキシ樹脂である、前記[1]〜[5]のいずれかに記載の補修工法。 [6] The repair method according to any one of [1] to [5], wherein the resin is an epoxy resin.
[7]前記工程(1)において、前記既設アンカーボルトの周囲に所定長の円筒状の穴を形成する前又は後に、該円筒上の穴の直径よりも大きな径の穴を前記基礎コンクリート表面から所定深さまで形成することをさらに含む、前記[1]〜[6]のいずれかに記載の補修工法。 [7] In the step (1), before or after forming a cylindrical hole having a predetermined length around the existing anchor bolt, a hole having a diameter larger than the diameter of the hole on the cylinder is formed from the surface of the foundation concrete. The repair method according to any one of [1] to [6], further including forming to a predetermined depth.
[8]前記基礎コンクリート表面から所定深さまで形成された、前記該円筒状の穴の直径よりも大きな径の穴内に、モルタルを該表面まで充填して、前記硬化樹脂を保護する工程を前記工程(5)の前にさらに含む、前記[7]に記載の補修工法。 [8] A step of protecting the cured resin by filling a mortar into the hole having a diameter larger than the diameter of the cylindrical hole formed from the surface of the basic concrete to a predetermined depth. The repair method according to [7], further included before (5).
本発明の構造物基礎の補修工法は、簡易的な機械で施工でき、簡単な施工で、特殊な工種が必要であるものの人編成を多くすることにより、施工数量を多くすることが可能である。また、施工範囲も小さく、防護メガネやマスクを装着していれば作業安全性に優れ、耐候性に優れた材料のみを使用しているため耐久性にも優れ、さらに経済性にも優れている。本発明の構造物基礎の補修工法は、既設アンカーボルトの腐食状態等に拘らず、施工が可能であり、将来想定される大規模地震にも耐えられるよう、補修箇所の全てにおいて、連結具の定着長さに比例した均質な引抜き応力を保証することができる。 The repair method of the structure foundation of the present invention can be constructed with a simple machine, and it is possible to increase the number of constructions by increasing the number of personnel that are simple construction and require special work types. . In addition, the construction range is small, and if safety glasses and masks are attached, work safety is excellent, and because only materials with excellent weather resistance are used, durability is excellent and economic efficiency is also excellent. . The structure foundation repair method of the present invention can be applied regardless of the corrosion state of the existing anchor bolts, etc., so that it can withstand large-scale earthquakes assumed in the future. A uniform pulling stress proportional to the fixing length can be guaranteed.
以下、本発明を詳細に説明する。
本発明は、基礎コンクリートに埋設された既設アンカーボルトの表面露出オネジ部に構造物のベースプレートがナットにより固定されている該構造物の基礎の補修工法であって、以下の工程:
(1)前記既設アンカーボルトの周囲のコンクリートを該表面から所定の深さまで除去して、前記既設アンカーボルトの周囲に円筒状の穴を形成する工程;
(2)前記円筒状の穴の底面から所定の位置で、前記アンカーボルトの上部を切断・除去する工程;
(3)メネジ部を一端側に有する所定長の中空円筒状連結具を、該メネジ部を上方にして、露出した既設アンカーボルトに覆い被せるように、前記円筒状の穴に挿入する工程;
(4)前記円筒状の穴内に樹脂を充填し、硬化させることにより、前記連結具を前記基礎コンクリートに定着させる工程;及び
(5)前記基礎コンクリートに定着した前記連結具のメネジ部に、前記構造物のベースプレートをボルトにより締結固定する工程;
を含む、構造物基礎の補修工法である。
Hereinafter, the present invention will be described in detail.
The present invention is a method for repairing a foundation of a structure in which a base plate of the structure is fixed to a surface exposed male screw portion of an existing anchor bolt embedded in the foundation concrete with a nut, and includes the following steps:
(1) removing the concrete around the existing anchor bolt to a predetermined depth from the surface to form a cylindrical hole around the existing anchor bolt;
(2) A step of cutting and removing the upper part of the anchor bolt at a predetermined position from the bottom surface of the cylindrical hole;
(3) A step of inserting a hollow cylindrical connector having a predetermined length having a female thread portion on one end side into the cylindrical hole so that the female thread portion is upward and the exposed existing anchor bolt is covered.
(4) filling the cylindrical hole with a resin and curing the resin to fix the connector to the foundation concrete; and (5) the female screw portion of the connector fixed to the foundation concrete, Fastening the base plate of the structure with bolts;
This is a repair method for structural foundations.
以下、図17〜23を参照して、本発明の構造物基礎の補修工法を説明する。
既設アンカーボルトに腐食胞性箇所がある場合に、既設アンカーボルトを切断することは、前記した既存工法と同様である(図2と図3参照)。
図17に示すように、コアボーリングで所定の深さ(せん孔又は削孔長さ)に円筒状の穴を形成する。かかるせん孔又は削孔長さは、以下に説明する連結具をエポキシ樹脂等の樹脂で基礎に定着させる定着長さに相当する。円筒状の穴の深さは、好ましくは、150mm〜400mmである。例えば、既設のアンカーボルト径がD24である場合、せん孔長さは300mmであり、D22の場合、270mmであり、D20の場合、250mmであり、そしてD16の場合、200mmであることができる。次いで、図18に示すように、必要により、形成された円筒状の穴の直径よりも大きな径の穴を基礎コンクリート表面から所定深さまで形成する。これは、前記円筒状の穴の形成の前に、実施してもよい。かかる円筒状の穴の直径よりも大きな径の穴の形成は、以下の作業の場所を確保する必要がある場合に行うことができる。
Hereinafter, with reference to FIGS. 17-23, the repair method of the structure foundation of this invention is demonstrated.
When the existing anchor bolt has a caustic site, cutting the existing anchor bolt is the same as the existing method described above (see FIGS. 2 and 3).
As shown in FIG. 17, a cylindrical hole is formed at a predetermined depth (perforation or drilling length) by core boring. Such perforation or drilling length corresponds to a fixing length for fixing a connector described below to a base with a resin such as an epoxy resin. The depth of the cylindrical hole is preferably 150 mm to 400 mm. For example, if the existing anchor bolt diameter is D24, the perforation length can be 300 mm, D22 can be 270 mm, D20 can be 250 mm, and D16 can be 200 mm. Next, as shown in FIG. 18, if necessary, a hole having a diameter larger than the diameter of the formed cylindrical hole is formed from the foundation concrete surface to a predetermined depth. This may be performed before the formation of the cylindrical hole. Formation of a hole having a diameter larger than the diameter of the cylindrical hole can be performed when a place for the following work needs to be secured.
次いで、図19に示すように、円筒状の穴の底面から所定の位置で、前記アンカーボルトの上部を切断・除去する。切断・除去する長さは、連結具のメネジ部に構造物のベースプレートを締結固定するための、メネジ部とボルトの嵌合長さに相当するものとなる。例えば、アンカーボルト径がD24の場合、嵌合長さは、40mmであり、D22の場合、35mmであり、D20の場合、30mmであり、そしてD16の場合、25mmであることができる(図24参照)。
次いで、図20に示すように、メネジ部を一端側に有する所定長の中空円筒状連結具を、該メネジ部を上方にして、露出した既設アンカーボルトに覆い被せるように、円筒状の穴に挿入する。そして図21に示すように、円筒状の穴内に樹脂を充填し、硬化させることにより、前記連結具を前記基礎コンクリートに定着させる。尚、円筒状の穴内に樹脂を充填した後に、メネジ部を一端側に有する所定長の中空円筒状連結具を、該メネジ部を上方にして、既設アンカーボルトに覆い被せるように、前記樹脂が充填された円筒状の穴に、挿入し、該樹脂を硬化させて、前記連結具を前記基礎コンクリートに定着させてもよい。連結具の外側面と円筒状の穴の内側面との隙間は、好ましくは5mm〜30mmである。かかる隙間に、例えば、エポキシ樹脂を充填し、前記した連結具の所定定着長さにわたり、硬化させることにより、連結具を基礎に、将来予想される地震に対して耐えられる強度で、強固に定着させることができる。
Next, as shown in FIG. 19, the upper part of the anchor bolt is cut and removed at a predetermined position from the bottom surface of the cylindrical hole. The length to be cut and removed corresponds to the fitting length of the female screw portion and the bolt for fastening and fixing the base plate of the structure to the female screw portion of the connector. For example, when the anchor bolt diameter is D24, the fitting length can be 40 mm, for D22, 35 mm, for D20, 30 mm, and for D16, 25 mm (FIG. 24). reference).
Next, as shown in FIG. 20, a hollow cylindrical connector having a predetermined length having a female threaded portion at one end is formed in a cylindrical hole so that the female threaded portion is covered upward and the existing anchor bolt is exposed. insert. And as shown in FIG. 21, the said connector is fixed to the said foundation concrete by filling resin in a cylindrical hole and making it harden | cure. In addition, after the resin is filled in the cylindrical hole, the resin is placed so that the hollow cylindrical coupler having a predetermined length on the one end side is covered with the existing anchor bolt with the female screw portion facing upward. The connecting tool may be fixed to the foundation concrete by inserting into a filled cylindrical hole and curing the resin. The clearance between the outer surface of the connector and the inner surface of the cylindrical hole is preferably 5 mm to 30 mm. For example, the gap is filled with, for example, epoxy resin and cured over the predetermined fixing length of the above-described connecting device, so that the fixing device is firmly fixed with a strength capable of withstanding an expected earthquake based on the connecting device. Can be made.
次いで、図22に示すように、基礎コンクリート表面から所定深さまで形成された、円筒状の穴の直径よりも大きな径の穴内に、モルタルを該表面まで充填して、硬化樹脂を保護する。モルタルは無収縮性であることが好ましい。樹脂としてエポキシ樹脂を用いた場合、エポキシ樹脂は有機物であり、紫外線による劣化する虞があるが、かかる無収縮モルタルの充填により、かかる紫外線劣化を防ぎ、水食に対する影響を抑制することができる。
最後に、図23に示すように、基礎コンクリートに定着させた連結具のメネジ部に、構造物のベースプレートをボルトにより締結固定することにより、本発明の補修工法は完結する。但し、図23には、構造物のベースプレートは図示していない。
構造物のベースプレートをボルトで固定することにより、ボルトに腐食があった場合、該ボルトだけの交換で足りるので、維持管理は、ナット連結よりも有利である。
Next, as shown in FIG. 22, mortar is filled up to the surface into a hole having a diameter larger than the diameter of the cylindrical hole formed from the surface of the basic concrete to a predetermined depth to protect the cured resin. The mortar is preferably non-shrinkable. When an epoxy resin is used as the resin, the epoxy resin is an organic substance and may be deteriorated by ultraviolet rays. However, the filling of the non-shrink mortar can prevent the ultraviolet ray deterioration and suppress the influence on water erosion.
Finally, as shown in FIG. 23, the repair method of the present invention is completed by fastening and fixing the base plate of the structure to the female thread portion of the connector fixed to the foundation concrete with bolts. However, the base plate of the structure is not shown in FIG.
By fixing the base plate of the structure with bolts, if the bolts are corroded, only the bolts need to be replaced, so maintenance is more advantageous than nut connection.
図24に、本発明の工法に使用する、D24である既存アンカーボルト用の連結具と、これと嵌合するボルトの具体例を示す。連結具の外側面に溝を設けることにより、基礎の円筒状穴の内側面との隙間に充填され、硬化されるエポキシ樹脂による定着力を高めることができる。連結具、ボルトの材質は問わないが、耐腐食性のあるステンレス鋼等であることが好ましい。 FIG. 24 shows a specific example of a connector for an existing anchor bolt, which is D24, and a bolt to be fitted to this, which are used in the method of the present invention. By providing the groove on the outer surface of the connector, it is possible to increase the fixing force of the epoxy resin that is filled and cured in the gap with the inner surface of the basic cylindrical hole. The material of the connector and the bolt is not limited, but is preferably stainless steel having corrosion resistance.
本発明の補修工法は、簡易的な機械で施工でき、特殊な工種が必要であるものの人編成を多くすることにより、施工数量を多くすることが可能である。また、施工範囲も小さく、防護メガネやマスクを装着していれば作業安全性に優れ、耐候性に優れた材料のみを使用しているため耐久性にも優れ、さらに経済性にも優れている。さらに、本発明の補修工法は、既設アンカーボルトに頼らないため、既設アンカーボルトの腐食状態等に拘らず、施工が可能である。設計思想は、後施工アンカーであり、将来想定される大規模地震にも耐えられる。最も重要なことは、本発明の補修工法においては、補修箇所の全てにおいて、連結具の定着長さに比例した均質な引抜き応力が保証されることである。これは、前記した既存工法や特許文献1に記載された特殊再生アンカーボルトを使用する工法では、なし得ない。この点で、本発明の補修工法は、従来技術の補修工法に比較して優れている。 The repair method according to the present invention can be constructed with a simple machine, and although a special work type is required, the number of construction can be increased by increasing the number of personnel. In addition, the construction range is small, and if safety glasses and masks are attached, work safety is excellent, and because only materials with excellent weather resistance are used, durability is excellent and economic efficiency is also excellent. . Furthermore, since the repair method of the present invention does not depend on the existing anchor bolts, it can be constructed regardless of the corrosion state of the existing anchor bolts. The design philosophy is post-installation anchors, which can withstand large-scale earthquakes expected in the future. Most importantly, in the repairing method of the present invention, a uniform pulling stress proportional to the fixing length of the connecting tool is guaranteed at all repair points. This cannot be achieved by the existing method described above or the method using the special recycled anchor bolt described in Patent Document 1. In this respect, the repair method of the present invention is superior to the repair method of the prior art.
本発明の構造物基礎の補修工法は、既設アンカーボルトの腐食状態等に拘らず、施工が可能であり、補修箇所の全てにおいて、連結具の定着長さに比例した均質な引抜き応力が保証されるため、補修された構造物は、将来想定される大規模地震にも耐えられる。よって、本発明の構造物基礎の補修工法は、標識・照明柱等の構造物、例えば、高速道路の鋼製高柵、防護柵の固定用アンカー等の補修に好適に利用可能である。 The structure foundation repair method of the present invention can be applied regardless of the corrosion state of the existing anchor bolts, etc., and a uniform pull-out stress proportional to the fixing length of the connector is guaranteed at all repair points. Therefore, the repaired structure can withstand a large-scale earthquake assumed in the future. Therefore, the structure foundation repair method of the present invention can be suitably used for repairing structures such as signs and lighting columns, for example, steel high fences on highways, anchors for securing guard fences, and the like.
Claims (8)
(1)前記既設アンカーボルトの周囲のコンクリートを該表面から所定の深さまで除去して、前記既設アンカーボルトの周囲に円筒状の穴を形成する工程;
(2)前記円筒状の穴の底面から所定の位置で、前記アンカーボルトの上部を切断・除去する工程;
(3)メネジ部を一端側に有する所定長の中空円筒状連結具を、該メネジ部を上方にして、露出した既設アンカーボルトに覆い被せるように、前記円筒状の穴に挿入する工程;
(4)前記円筒状の穴内に樹脂を充填し、硬化させることにより、前記連結具を前記基礎コンクリートに定着させる工程;及び
(5)前記基礎コンクリートに定着した前記連結具のメネジ部に、前記構造物のベースプレートをボルトにより締結固定する工程;
を含む、構造物基礎の補修工法。 A structure base repair method in which a base plate of a structure is fixed to a surface exposed male thread portion of an existing anchor bolt embedded in the foundation concrete with a nut, and includes the following steps:
(1) removing the concrete around the existing anchor bolt to a predetermined depth from the surface to form a cylindrical hole around the existing anchor bolt;
(2) A step of cutting and removing the upper part of the anchor bolt at a predetermined position from the bottom surface of the cylindrical hole;
(3) A step of inserting a hollow cylindrical connector having a predetermined length having a female thread portion on one end side into the cylindrical hole so that the female thread portion is upward and the exposed existing anchor bolt is covered.
(4) filling the cylindrical hole with a resin and curing the resin to fix the connector to the foundation concrete; and (5) the female screw portion of the connector fixed to the foundation concrete, Fastening the base plate of the structure with bolts;
Structural foundation repair methods including
(3’)前記円筒状の穴内に樹脂を充填する工程;及び
(4’)メネジ部を一端側に有する所定長の中空円筒状連結具を、該メネジ部を上方にして、既設アンカーボルトに覆い被せるように、前記樹脂が充填された円筒状の穴に、挿入し、該樹脂を硬化させて、前記連結具を前記基礎コンクリートに定着させる工程;
を含む、請求項1又は2に記載の補修工法。 Instead of the steps (3) and (4), the following steps:
(3 ′) filling resin into the cylindrical hole; and (4 ′) a hollow cylindrical coupler having a predetermined length having a female thread portion at one end side, and the existing anchor bolt with the female thread portion facing upward. Inserting into the cylindrical hole filled with the resin so as to cover it, curing the resin, and fixing the connector to the foundation concrete;
The repair method according to claim 1 or 2, comprising
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CN109024469A (en) * | 2018-06-09 | 2018-12-18 | 中交航局第工程有限公司 | A kind of concrete segment and its hanging the application in bottom technique |
CN109024469B (en) * | 2018-06-09 | 2021-03-19 | 中交一航局第一工程有限公司 | Concrete component and application thereof in bottom hanging process |
WO2022247960A1 (en) * | 2021-09-16 | 2022-12-01 | 中广核工程有限公司 | Threaded member manufacturing method and thread machining device |
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