JP2011099278A - Method and implement for repairing anchor bolt for slope stabilization - Google Patents

Method and implement for repairing anchor bolt for slope stabilization Download PDF

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Publication number
JP2011099278A
JP2011099278A JP2009255655A JP2009255655A JP2011099278A JP 2011099278 A JP2011099278 A JP 2011099278A JP 2009255655 A JP2009255655 A JP 2009255655A JP 2009255655 A JP2009255655 A JP 2009255655A JP 2011099278 A JP2011099278 A JP 2011099278A
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anchor
sleeve
anchor bolt
corroded
repair
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JP5431877B2 (en
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Kiyoshi Suzuki
清 鈴木
Akira Fukuda
晃 福田
Takatsugu Hamada
卓嗣 濱田
Ryohei Kaneko
良平 金子
Yudai Iehisa
侑大 家久
Hidetoshi Maruyama
英俊 丸山
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Daikure KK
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Daikure KK
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  • Piles And Underground Anchors (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for repairing a corroded anchor bolt inserted in and fixed to a slope for a soil nailing method for stabilizgin a cut slop or a ground anchor construction method. <P>SOLUTION: This method includes: a step of removing slope works and digging down the surface soil of the slope so as to expose a corroded portion of the anchor bolt 4; a step of cutting off for removing the corroded portion; a step of fastening and coupling both the anchor bolts 4a and 4b together with a bolt and a nut by applying a repairing implement 11 to the anchor bolt 4a, from which the corroded portion is cut off and removed, and the newly-added anchor bolt 4b, through the use of a repairing implement 9 in which sleeves split into two pieces are coupled together in such a manner as to be openable/closable via a hinge; and a step of constructing the slope after repairing the anchor bolt. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、法面安定化のため施工された地山補強土工法やグラウンドアンカー工法において使用された鉄筋やアンカー(以下、これらを総称して単にアンカー等ということがある)に腐食を生じたとき、該アンカー等を補修する補修方法と、該方法において用いられる補修具に関する。   The present invention caused corrosion in reinforcing bars and anchors (hereinafter, sometimes simply referred to as “anchors”) used in natural ground reinforced earth construction methods and ground anchor methods constructed for slope stabilization. The present invention relates to a repair method for repairing the anchor and the like, and a repair tool used in the method.

地山補強土工法やグラウンドアンカー工法は、山間部での道路工事や宅地造成工事等において、法面の崩壊を防止する目的で多用され、このうち、地山補強土工法は主として切土の法面や自然斜面において、地山に鉄筋を定着させて地山の強度を増加させ、法面の勾配を急にして法面の面積を少なくすることを目的として採用されている。   The natural ground reinforced earth method and ground anchor method are frequently used to prevent the collapse of slopes in road construction and residential land development in mountainous areas. Among them, the natural ground reinforced earth method is mainly a cutting method. It is used for the purpose of reducing the area of the slope by steeping the slope of the slope and increasing the strength of the slope by fixing the reinforcing bars on the ground and the natural slope.

一方、グラウンドアンカー工法は、地山に定着したアンカーの法面からの突出部分に受圧板を差込み、ついでその上からナットを捩じ込んで締着し、地盤の地耐力に相応する軸力(引張力)をアンカーに与える構造を有するもので、その一例が下記特許文献1に開示されている。   On the other hand, in the ground anchor method, a pressure receiving plate is inserted into the protruding part of the anchor fixed on the ground, and then a nut is screwed in and tightened, and an axial force corresponding to the ground strength of the ground ( One example of such a structure is disclosed in Patent Document 1 below.

特開平6−88341号JP-A-6-88341

前述する工法で使用されたアンカー等は、長期の使用により雨水が染み込んで腐食することがあり、点検の結果、腐食の多くは法面の表土近くで局部的に発生していることが判明した。   Anchors, etc. used in the above-mentioned construction method may corrode due to rainwater permeating through long-term use, and as a result of inspection, it was found that most of the corrosion occurred locally near the slope topsoil. .

本発明は、腐食が法面の表土近くで局部的に発生したアンカー等に対する補修を行うための補修方法と、該方法で用いられる補修具を提供することを目的とする。   An object of this invention is to provide the repair method for repairing the anchor etc. which corrosion generate | occur | produced locally near the topsoil of a slope, and the repair tool used by this method.

請求項1に係わる発明は、法面安定化のために実施された地山補強土工法やグラウンドアンカー工法において使用されたアンカー等に腐食を生じたとき、該アンカー等の腐食部分を補修する補修方法であって、法面工を撤去し、法面の表土を掘り下げてアンカー等の腐食部分を露出する工程と、アンカー等の腐食部分に補修具を当てがって固着し、腐食部分を強化するか、或いは前記腐食部分を切取ったのち、地番に定着されるアンカー等の端部に補修具を継ぎ足して連結することを特徴とする。   The invention according to claim 1 is a repair for repairing a corroded portion of an anchor or the like used in a ground-reinforced earth method or a ground anchor method carried out for stabilizing the slope. It is a method, removing the slope work, digging up the surface soil of the slope to expose the corroded part of the anchor, etc., and fixing the corroded part such as the anchor with a repair tool to strengthen the corroded part Alternatively, after the corroded portion is cut off, a repair tool is added to the end of an anchor or the like fixed to the lot number and connected.

請求項2に係わる発明は、請求項1に係わる発明で使用される補修具であって、周方向に適当間隔で分割された複数のスリーブからなり、アンカー等の腐食部分或いは該腐食部分を切除したアンカー等の端部の周りに当てがって組付けられるスリーブと、アンカー等に当てがわれたスリーブをアンカー等に強固に締着する締着手段とよりなることを特徴とし、
請求項3に係わる発明は、請求項2に係わる発明の補修具において、前記分割されたスリーブは、スリーブ同士を軸方向に連結できるようにするための連結手段を有することを特徴とする。
The invention according to claim 2 is a repair tool used in the invention according to claim 1, comprising a plurality of sleeves divided at appropriate intervals in the circumferential direction, and the corroded portion of the anchor or the like is excised. Characterized in that it comprises a sleeve that is assembled around the end of an anchor or the like, and a fastening means that firmly fastens the sleeve applied to the anchor or the like to the anchor or the like,
According to a third aspect of the present invention, in the repair tool according to the second aspect of the invention, the divided sleeves have connecting means for connecting the sleeves in the axial direction.

請求項4に係わる発明は、請求項2又は3に係わる発明の補修具において、アンカー等に当てがって組付けられるスリーブ内にモルタルが充填されることを特徴とし、
請求項5に係わる発明は、請求項2ないし4に係わる発明において、アンカー等がネジ節鉄筋であるか、異形鉄筋であり、分割されたスリーブがそれぞれアンカー等の前記ネジ節鉄筋に螺着される分割ナットを有するか、或いは異形鉄筋の節に係止する突起を有することを特徴とする。
The invention according to claim 4 is characterized in that, in the repair tool of the invention according to claim 2 or 3, mortar is filled in a sleeve that is assembled against an anchor or the like.
The invention according to claim 5 is the invention according to claims 2 to 4, wherein the anchor or the like is a screw rebar or a deformed rebar, and the divided sleeves are respectively screwed to the screw joint rebar such as the anchor. It is characterized by having a split nut or a projection that is locked to a deformed bar node.

請求項6に係わる発明は、請求項1に係わる発明で使用される補修具であって、一端部が腐食部分を切除したアンカー等の端部に差込み可能で、端に向かってテーパになっていると共に、周方向に適当間隔で割り溝が入れられて縮径可能であり、かつ前記一端部を除く箇所にネジ部が形成されたコレットと、該コレットに他端から嵌挿されるスリーブと、前記コレットのネジ部に捩じ込まれ、スリーブを前記一端部に向けて押込むナットとよりなることを特徴とし、
請求項7に係わる発明は、請求項6に係わる発明のコレットが一端部をアンカー等の端部に差込み可能で、周方向に割り溝が入れられた構成である代わりに周方向に適当間隔で分割された複数のスリーブからなって、アンカー等の端部に組付けられることを特徴とする。
The invention according to claim 6 is a repair tool used in the invention according to claim 1, wherein one end portion can be inserted into an end portion of an anchor or the like having a corroded portion removed, and is tapered toward the end. And a collet in which split grooves are inserted at appropriate intervals in the circumferential direction so that the diameter can be reduced, and a screw part is formed at a place excluding the one end, and a sleeve fitted into the collet from the other end, It is screwed into the threaded portion of the collet, and comprises a nut that pushes the sleeve toward the one end,
In the invention according to claim 7, the collet of the invention according to claim 6 is configured such that one end portion can be inserted into an end portion of an anchor or the like and split grooves are inserted in the circumferential direction at an appropriate interval in the circumferential direction. It consists of a plurality of divided sleeves and is assembled to the end of an anchor or the like.

請求項8に係わる発明は、請求項6又は7に係わる発明の補修具がコレット内にモルタルを充填したことを特徴とする。   The invention according to claim 8 is characterized in that the repair tool of the invention according to claim 6 or 7 is filled with mortar in a collet.

請求項1に係わる発明によると、腐食が法面で局部的に発生したアンカー等の補修をアンカー等を地盤に定着したまま取除くことなく補修することができ、アンカー等を取除いて新たにアンカー等を定着するのに比べ、工期を短縮し、費用を低減させることができる。   According to the first aspect of the invention, it is possible to repair an anchor or the like where corrosion has occurred locally on the slope without removing the anchor while it is fixed on the ground. Compared to fixing anchors and the like, the construction period can be shortened and the cost can be reduced.

請求項2に係わる発明によると、分割されたスリーブをアンカー等に当てがって締着手段で締着することにより腐食したアンカー等の補修を行うことができ、請求項3に係わる発明によると、補修具を必要の長さに連結して使用することができる。   According to the invention according to claim 2, it is possible to repair the corroded anchor or the like by applying the divided sleeve to the anchor or the like and fastening with the fastening means. The repair tool can be used by connecting it to the required length.

請求項4及び8に係わる発明によると、充填されたモルタルによりアンカー等と補修具の連結強度が増し、モルタルで被覆されるアンカー等の腐食を防ぐことができる。   According to the invention concerning Claim 4 and 8, the connection intensity | strength of an anchor etc. and a repair tool increases with the filled mortar, and corrosion of the anchor etc. which are coat | covered with mortar can be prevented.

請求項5に係わる発明によると、補修具がアンカー等から抜け止めされる。
請求項6及び7に係わる発明によると、ナットの捩じ込みによりコレットが楔作用でアンカー等を強固に固着することができる。
According to the invention concerning claim 5, the repair tool is prevented from coming off from the anchor or the like.
According to the invention related to claims 6 and 7, the collet can firmly fix the anchor or the like by the wedge action by screwing the nut.

グラウンドアンカー工法による構造を示す断面図。Sectional drawing which shows the structure by a ground anchor construction method. 法面工を除去し、アンカーボルトの腐食部分を露出させた状態を示す図。The figure which shows the state which removed the slope work and exposed the corrosion part of the anchor bolt. 補修具によって補修したアンカーボルトの要部を示す図。The figure which shows the principal part of the anchor bolt repaired with the repair tool. 補修具の斜視図。The perspective view of a repair tool. アンカーボルトを補修した補修具の断面図。Sectional drawing of the repair tool which repaired the anchor bolt. 補修具の別の例の部分断面側面図。The partial cross section side view of another example of a repair tool. アンカーボルトを補修した補修具の更に別の例の断面図。Sectional drawing of another example of the repair tool which repaired the anchor bolt. アンカーボルトを補修した接続タイプの補修具の断面図。Sectional drawing of the connection type repair tool which repaired the anchor bolt. 接続タイプの補修具の別の例の断面図。Sectional drawing of another example of a connection type repair tool. 図8に示す補修具を用いてアンカーボルトを補修し、法面工を施工した断面図。Sectional drawing which repaired an anchor bolt using the repair tool shown in FIG. 8, and constructed slope work. 補修具の他の例を示す断面図。Sectional drawing which shows the other example of a repair tool. 図11のA−A線断面図。FIG. 12 is a sectional view taken along line AA in FIG. 11. 図11に示す補修具を用いてアンカーボルトを補修し、法面工を施工した断面図。Sectional drawing which repaired an anchor bolt using the repair tool shown in FIG. 11, and constructed slope work.

以下、本発明の実施形態について図面により説明する。
図1は、グラウンドアンカー工法による施工構造を示すもので、法面1に掘削した削孔2内に挿入され、先端部をグラウト材3により固着して土中に締着したアンカーとしての異形鉄筋からなるアンカーボルト4と、該アンカーボルト4の法面1からの突出部分に設けられる法面工5から構成され、法面工5はアンカーボルト4の法面1からの突出部分に差し込まれる受圧板6と、受圧板6上に当てられる押え板7を介し、アンカーボルト4に捩じ込んで締着されるナット8とよりなっており、アンカーボルト4としては、異形鉄筋以外にネジ節鉄筋や節のない鉄筋を用いることができる。また受圧板6には、例えばプレキャストコンクリート板、FRP又は鋼製の格子状構造物が用いられるが、アンカーボルト4の軸力(引張力)を支持できる受圧構造物であれば、その種類を問わない。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a construction structure by a ground anchor method, and a deformed reinforcing bar as an anchor inserted into a drilling hole 2 excavated on a slope 1 and fixed at a tip end with a grout material 3 and fastened in soil. The anchor bolt 4 and the slope 5 provided on the projecting portion of the anchor bolt 4 from the slope 1, and the slope 5 is inserted into the projecting portion of the anchor bolt 4 from the slope 1. It consists of a plate 6 and a nut 8 that is screwed and fastened to the anchor bolt 4 via a presser plate 7 applied to the pressure receiving plate 6. Reinforcing bars with no joints can be used. Further, as the pressure receiving plate 6, for example, a precast concrete plate, FRP or a steel lattice structure is used, but any type of pressure receiving structure can be used as long as it can support the axial force (tensile force) of the anchor bolt 4. Absent.

次に前述のアンカーボルト4が法面1の表土近くで腐食した場合の当該アンカーボルト4の補修方法について説明する。   Next, a method for repairing the anchor bolt 4 when the anchor bolt 4 is corroded near the topsoil of the slope 1 will be described.

先ず、ナット8及び押え板7を取外し、受圧板6を取除くか、或いは受圧板6を取り壊して法面工5を撤去する。ついでアンカーボルト4の周りの法面1を掘り下げてアンカーボルト4の腐食部分aを露出させたのち(図2)、腐食部分を切り取る。次に継ぎ足される新しいアンカーボルト4bを所要長さに切断し、腐食部分を取除いたアンカーボルト4aの切断端に補修具9によって連結し、継ぎ足す(図3)。アンカーボルト補修後、前述の法面土を施工する。   First, the nut 8 and the presser plate 7 are removed and the pressure receiving plate 6 is removed, or the pressure receiving plate 6 is demolished and the slope work 5 is removed. Next, the slope 1 around the anchor bolt 4 is dug to expose the corroded portion a of the anchor bolt 4 (FIG. 2), and then the corroded portion is cut off. Next, the new anchor bolt 4b to be added is cut to a required length, and connected to the cut end of the anchor bolt 4a from which the corroded portion has been removed by the repair tool 9, and added (FIG. 3). After repairing the anchor bolts, the above-mentioned slope soil is applied.

図4は、補修具の一例を示すもので、該補修具11は、二つ割りにしたスリーブ12の一側端をヒンジ13により連結して開閉可能となし、他側のフランジ部分14を締着手段を構成するボルト15とナット16により締着できるようにしたもので、スリーブ12の内周側には異形鉄筋よりなるアンカーボルト4の節に抜け止めのため係止する突起17が周方向に形成されている。   FIG. 4 shows an example of a repair tool. The repair tool 11 can be opened and closed by connecting one end of a sleeve 12 divided by a hinge 13 and fastening the flange portion 14 on the other side. Are formed by a bolt 15 and a nut 16 that form a ring, and a protrusion 17 is formed in the circumferential direction on the inner peripheral side of the sleeve 12 to prevent the anchor bolt 4 made of a deformed reinforcing bar from coming off. Has been.

図5は、図4に示す補修具11を用いて腐食部分を切り取ったアンカーボルト4aに新たなアンカーボルト4bを継ぎ足して連結した構造を示すもので、図4に示すボルト15とナット16の締結により補修具11がアンカーボルト4を抱きこんで強固に締着するようになっており、突起17がアンカーボルト4a、4bの節4cに係止してアンカーボルト4a、4bの抜け止めを行うようになっている。   FIG. 5 shows a structure in which a new anchor bolt 4b is connected to an anchor bolt 4a from which a corroded portion has been cut using the repair tool 11 shown in FIG. 4, and the bolt 15 and the nut 16 shown in FIG. As a result, the repair tool 11 holds the anchor bolt 4 firmly and fastens, and the projection 17 is locked to the node 4c of the anchor bolt 4a, 4b to prevent the anchor bolt 4a, 4b from coming off. It has become.

図4に示す補修具11は、二つ割りにしたスリーブ12の一側端をヒンジ13により連結し、スリーブ12の他側をボルト15とナット16により締結しているが、ヒンジ13に代え、両側を締着手段であるボルト15とナット16により締結してもよいし、図6に示すように、二つ割りにしたスリーブ18の一側のフランジ部分19を、L形のフック20を差込孔21に差込むことにより連結し、他端のフランジ部分22をボルト23、ナット24により締結するようにしてもよく、また二つ割り或いは三つ割以上に分割したスリーブを締着手段としての抱き締め金具により外側より抱き込んで締着するようにしてもよい。締着手段としては以上のほか、クランプその他既知のもの、或いはこれらの組み合わせを用いることができる。要は複数に分割したスリーブをアンカーボルトに取付けて締着できるものであればよく、その種類は問わない。いずれの場合でも分割されたスリーブを組み合わせて例えば上述するように、フランジ同士をボルトやナットにより締結したり、抱き締め金具により外側より抱き込んで締着し、或いは他の方法で締着するときには、シールのため、例えばフランジ間にゴム又は樹脂性のシール材を介在させたり、アンカーボルトをゴム又は樹脂製のチューブに通してアンカーボルトの全周を被覆し、その外側からスリーブで締着するのが望ましい。   In the repairing tool 11 shown in FIG. 4, one end of the divided sleeve 12 is connected by a hinge 13, and the other side of the sleeve 12 is fastened by a bolt 15 and a nut 16. The bolts 15 and nuts 16 as fastening means may be fastened. As shown in FIG. 6, the flange portion 19 on one side of the sleeve 18 divided into two parts, and the L-shaped hook 20 into the insertion hole 21. The flange portion 22 at the other end may be fastened by a bolt 23 and a nut 24, and the sleeve divided into two or more than three may be fastened from the outside by a clamp as a fastening means. You may make it embrace and fasten. As the fastening means, in addition to the above, a clamp or other known ones, or a combination thereof can be used. In short, any type of sleeve may be used as long as it can be fastened by attaching a plurality of divided sleeves to an anchor bolt. In any case, combining the divided sleeves, for example, as described above, when the flanges are fastened with bolts or nuts, are clamped by being clamped from the outside with a clamp, or are fastened by other methods, For sealing, for example, a rubber or resin sealant is interposed between the flanges, or the anchor bolt is passed through a rubber or resin tube to cover the entire circumference of the anchor bolt and tightened with a sleeve from the outside. Is desirable.

図7に示す補修具26は、複数に分割したスリーブ27で腐食部分を切り取ったアンカーボルト4aと継ぎ足される新たなアンカーボルト4bを前述の方法により締結した構造を示すもので、スリーブ27内には該スリーブに開けられた図示しないモルタル注入口より注入されたモルタル28が充填されている。図中、29はシールのためスリーブ両端に装填されるゴム又は樹脂製のシール材である。   The repair tool 26 shown in FIG. 7 shows a structure in which a new anchor bolt 4b to be joined with an anchor bolt 4a cut off from a corroded portion by a sleeve 27 divided into a plurality of parts is fastened by the above-described method. A mortar 28 injected from a mortar inlet (not shown) opened in the sleeve is filled. In the figure, reference numeral 29 denotes a rubber or resin sealing material loaded at both ends of the sleeve for sealing.

本実施形態の補修具26において、スリーブ27は前述のスリーブ12と異なり、両端にモルタル止めのための環状の突起31を有し、充填したモルタルが漏出されないようにすると共に、アンカーボルト4a、4bの節4cに係止できるようにしているが、図5に示す補修具11のようにアンカーボルト4a、4bの節4cに係止して抜け止めを行う突起17は備えていない。   In the repair tool 26 of the present embodiment, unlike the sleeve 12 described above, the sleeve 27 has annular protrusions 31 for fixing mortar at both ends to prevent the filled mortar from leaking out and the anchor bolts 4a, 4b. However, the repair tool 11 shown in FIG. 5 does not include the protrusion 17 that is locked to the node 4c of the anchor bolts 4a and 4b to prevent the node 4c from coming off.

本実施形態の補修具26によると、モルタル28の充填によりアンカーボルト4a、4bの連結強度が増大し、またアンカーボルト4a、4bの腐食を防止することができる。   According to the repair tool 26 of the present embodiment, the connection strength of the anchor bolts 4a and 4b is increased by filling the mortar 28, and corrosion of the anchor bolts 4a and 4b can be prevented.

上記各実施形態では、アンカーボルト4aは腐食部分が切り取られ、これに新たなアンカーボルト4bが継ぎ足されて補修具11、26により締着して連結されるようになっているが、腐食部分を切り取らないで、補修具11、26を腐食部分を含むアンカーボルト4の周りに当てがい、前述するように締着して補修するようにしてもよい。   In each of the above embodiments, the anchor bolt 4a is cut off from the corroded portion, and a new anchor bolt 4b is added to the anchor bolt 4b and fastened by the repairing tools 11 and 26. Without repairing, the repairing tools 11 and 26 may be applied around the anchor bolt 4 including the corroded portion and fastened and repaired as described above.

補修具11、26の長さが不足する場合、例えば前述する例でいえば、腐食部分の長さが長く、一つの補修具11、26では対応できない場合、複数の補修具が連結手段によって連結され、継ぎ足すことができるようにされる。   When the lengths of the repair tools 11 and 26 are insufficient, for example, in the above-described example, when the length of the corroded portion is long and cannot be handled by one repair tool 11 or 26, a plurality of repair tools are connected by the connecting means. And can be added.

図8は、そのための補修具35の一例を示すもので、この補修具35は複数に分割したスリーブ36の円弧断面をなす各スリーブの一端にそれぞれ凸部37を備えた円弧断面の突片38を突出形成すると共に、他端に凸部37が嵌合係止し、該凸部37と共に連結手段を構成する凹部39を形成している。そして内周側にはアンカーボルト4を支持し、節4cに係止可能なリブ40を形成している。   FIG. 8 shows an example of a repairing tool 35 for this purpose. This repairing tool 35 is a projecting piece 38 having an arc cross section provided with a convex portion 37 at one end of each sleeve forming the arc cross section of the sleeve 36 divided into a plurality of parts. , And a convex portion 37 is fitted and locked to the other end to form a concave portion 39 that constitutes a connecting means together with the convex portion 37. On the inner peripheral side, the anchor bolt 4 is supported, and a rib 40 that can be locked to the node 4c is formed.

連結手段として図示する例では、スリーブ端に形成される凸部37と、該凸部37に嵌合係止する凹部39を示しているが、図9に示す別の例の連結手段では、スリーブ36の一端の外周側にL形断面のフック41が、他端に該フック41に係止する鉤部42が形成されている。連結手段は要するに、補修具を継ぎ足してアンカーボルトの軸力に耐え得るようなものであればよく、その種類を問わない。   In the example illustrated as the connecting means, the convex portion 37 formed at the end of the sleeve and the concave portion 39 fitted and locked to the convex portion 37 are shown. However, in another example of the connecting means shown in FIG. A hook 41 having an L-shaped cross section is formed on the outer peripheral side of one end of 36, and a collar portion 42 that is engaged with the hook 41 is formed on the other end. In short, any connecting means may be used as long as it can withstand the axial force of the anchor bolt by adding a repair tool.

図10は、図8に示す補修具35を用いてアンカーボルトを補修した例を示すもので、先ず所要長さのアンカーボルト4bの周りにスリーブ36を前述の方法によって組付け、締着する。次に腐食部分を切り取って除去したアンカーボルト4a端に前述のスリーブ付きアンカーボルト4bを繋ぎ、継ぎ足される補修具35のスリーブ36に形成される突片38の凸部37に凹部39を嵌合させて組付け、締着して上下の補修具35を連結する。その後、スリーブ付きのアンカーボルト4bに受圧板6を差込み、押え板7を介してナット8を捩じ込み締結して法面土を施工する。   FIG. 10 shows an example in which the anchor bolt is repaired using the repairing tool 35 shown in FIG. 8. First, the sleeve 36 is assembled around the anchor bolt 4b of a required length by the above-described method and fastened. Next, the anchor bolt 4b with the sleeve is connected to the end of the anchor bolt 4a from which the corroded portion has been cut off and removed, and the concave portion 39 is fitted to the convex portion 37 of the protruding piece 38 formed on the sleeve 36 of the repairing tool 35 to be added. Assemble and fasten the upper and lower repair tools 35 together. Thereafter, the pressure receiving plate 6 is inserted into the anchor bolt 4b with the sleeve, and the nut 8 is screwed and fastened through the presser plate 7 to construct the slope soil.

上記実施形態では、アンカーボルト4bに補修具35を締着したのち、アンカーボルト4aに継ぎ足して連結しているが、補修具35を予めアンカーボルト4aに締着しないで、後からアンカーボルト4aにアンカーボルト4bを継ぎ足した状態で上下の補修具35を締着するようにしてもよい。   In the above embodiment, the repair tool 35 is fastened to the anchor bolt 4b and then connected to the anchor bolt 4a. The upper and lower repair tools 35 may be fastened with the anchor bolt 4b added.

図11及び図12に示す補修具45は、一端部が中空で、アンカーボルト4a端が挿入可能であると共に、一端に向かって徐々に肉厚となるテーパ状をなし、割り溝47を十文字に形成すると共に、一端部を除く箇所をネジ部48としたコレット49と、該コレット49にネジ部側から挿入され、テーパ部の一端部に当たるスリーブ51と、前記コレット49のネジ部48に捩じ込まれるナット52とよりなっている。図示するコレット49は、一端部が中空となっているが、全体を中空としてもよい。   The repair tool 45 shown in FIGS. 11 and 12 is hollow at one end, can be inserted at the end of the anchor bolt 4a, has a taper shape that gradually increases in thickness toward the one end, and the split groove 47 has a cross shape. A collet 49 having a threaded portion 48 excluding one end portion, a sleeve 51 inserted into the collet 49 from the threaded portion side and hitting one end portion of the tapered portion, and a screwed portion 48 of the collet 49 are twisted. It consists of a nut 52 to be inserted. The illustrated collet 49 is hollow at one end, but may be entirely hollow.

本実施形態の補修具45によるアンカーボルトの補修は、腐食部分を切り取って切除したアンカーボルト4a端にコレット49の一端部に差し込んだのち、スリーブ51をコレット49にネジ部側の上端より挿入する。ついでナット52をネジ部48に捩じ込み、スリーブ51を押し動かしてコレット49のテーパ状をなす下端部に押込む。これによりコレット49の下端部が楔作用によりアンカーボルト端に圧着し、更なるナット52の捩じ込みにより、強固に圧着して固定される。図13は、本実施形態の補修具45を用いてアンカーボルトを補修したのち法面工を施工した例を示すものである。   The anchor bolt is repaired by the repair tool 45 of the present embodiment, after the corroded portion is cut and excised and inserted into one end of the collet 49, and then the sleeve 51 is inserted into the collet 49 from the upper end on the screw portion side. . Next, the nut 52 is screwed into the threaded portion 48 and the sleeve 51 is pushed and moved into the tapered lower end portion of the collet 49. As a result, the lower end portion of the collet 49 is crimped to the anchor bolt end by a wedge action, and is further firmly crimped and fixed by further screwing of the nut 52. FIG. 13 shows an example in which a slope work is performed after repairing an anchor bolt using the repair tool 45 of the present embodiment.

本実施形態の補修具45は、コレット49の一端部が一端に向かって徐々に肉厚に形成されているが、徐々に肉厚に形成する代わりに肉厚を一定にして、一端に内向きの係合部を形成してもよい。またスリーブ51は一端部の肉厚が一端に向かって徐々に肉厚となるように形成してもよい。   In the repair tool 45 of the present embodiment, one end portion of the collet 49 is gradually formed thicker toward one end, but instead of being gradually formed thicker, the wall thickness is constant and inward toward one end. The engaging portion may be formed. The sleeve 51 may be formed so that the thickness of one end portion gradually becomes thicker toward one end.

前記各実施形態は、グラウンドアンカー工法により施工されたアンカーボルトの補修に用いる補修具を示しているが、これら補修具は補強土工法により施工された鉄筋やアンカーの補修に用いることもでき、また、山間部の小規模吊橋に用いられるアンカー、その他アンカーを使用する全ての構造物のアンカーに適用することができる。   Although each said embodiment has shown the repair tool used for the repair of the anchor bolt constructed | assembled by the ground anchor method, these repair tools can also be used for the repair of the reinforcing bar and anchor constructed by the reinforced earth method. The present invention can be applied to anchors used for small-scale suspension bridges in mountainous areas and other structures using anchors.

1・・法面
2・・削孔
3・・グラウト材
4、4a、4b・・アンカーボルト
4c・・アンカーボルトの節
5・・法面工
6・・受圧板
7・・押え板
8、16、24、52・・ナット
9、11、26、35、45・・補修具
12、18、27、36、51・・スリーブ
13・・ヒンジ
14、19、22・・フランジ部分
15、23・・ボルト
17、31・・突起
20・・L形のフック
21・・差込孔
28・・モルタル
29・・シール材
37・・凸部
38・・突片
39・・凹部
40・・リブ
41・・フック
42・・鉤部
47・・割り溝
48・・ネジ部
49・・コレット
50・・座金
1. ・ Slope 2 ・ ・ Drilling hole 3 ・ Groat material 4, 4a, 4b ・ ・ Anchor bolt 4c ・ ・ Screw anchor 5 ・ ・ Slope 6 ・ ・ Pressure plate 7 ・ ・ Presser plates 8 and 16 , 24, 52 ·· Nut 9, 11, 26, 35, 45 · · Repair tool 12, 18, 27, 36, 51 · · Sleeve 13 · · Hinge 14, 19, 22 · · Flange portion 15, 23 · · Bolts 17, 31, projection 20, L-shaped hook 21, insertion hole 28, mortar 29, sealing material 37, projection 38, projection 39, recess 40, rib 41, Hook 42 .. collar part 47 .. split groove 48 .. screw part 49 .. collet 50.

Claims (8)

法面安定化のために実施された地山補強土工法やグラウンドアンカー工法において使用されたアンカー等に腐食を生じたとき、該アンカー等の腐食部分を補修する補修方法であって、法面工を撤去し、法面の表土を掘り下げてアンカー等の腐食部分を露出する工程と、アンカー等の腐食部分に補修具を当てがって固着し、腐食部分を強化するか、或いは前記腐食部分を切取ったのち、地番に定着されるアンカー等の端部に補修具を継ぎ足して連結することを特徴とするアンカーボルトの補修方法。   A repair method for repairing a corroded portion of an anchor or the like used in a ground reinforced earth method or ground anchor method carried out for stabilizing the slope. And digging up the slope topsoil to expose the corroded part of the anchor, etc. and fixing the corroded part such as the anchor with a repair tool to strengthen the corroded part or A method for repairing an anchor bolt, comprising: cutting and connecting a repair tool to an end of an anchor or the like fixed to a lot number. 周方向に適当間隔で分割された複数のスリーブからなり、アンカー等の腐食部分或いは該腐食部分を切除したアンカー等の端部の周りに当てがって組付けられるスリーブと、アンカー等に当てがわれたスリーブをアンカー等に強固に締着する締着手段とよりなることを特徴とする請求項1記載の補修方法で用いられる補修具。   It consists of a plurality of sleeves divided at appropriate intervals in the circumferential direction. The sleeve is attached to the corroded portion of the anchor or the like around the end of the anchor or the like with the corroded portion removed, and the anchor 2. The repair tool used in the repair method according to claim 1, further comprising fastening means for firmly fastening the sleeve to an anchor or the like. 前記分割されたスリーブは、スリーブ同士を軸方向に連結できるようにするための連結手段を有することを特徴とする請求項2記載の補修具。   The repair tool according to claim 2, wherein the divided sleeve has a connecting means for connecting the sleeves in the axial direction. アンカー等に当てがって組付けられるスリーブ内にモルタルが充填されることを特徴とする請求項2又は3記載の補修具。   The repair tool according to claim 2 or 3, wherein a mortar is filled in a sleeve that is assembled by being applied to an anchor or the like. アンカー等がネジ節鉄筋であるか、異形鉄筋であり、分割されたスリーブがそれぞれアンカー等の前記ネジ節鉄筋に螺着される分割ナットを有するか、或いは異形鉄筋の節に係止する突起を有することを特徴とする請求項2ないし4記載の補修具。   The anchor is a threaded reinforcing bar or a deformed reinforcing bar, and the divided sleeves each have a split nut screwed to the threaded reinforcing bar such as the anchor, or a protrusion that is locked to the deformed reinforcing bar. The repair tool according to claim 2, wherein the repair tool is provided. 一端部が腐食部分を切除したアンカー等の端部に差込み可能で、端に向かってテーパになっていると共に、周方向に適当間隔で割り溝が入れられて縮径可能であり、かつ前記一端部を除く箇所にネジ部が形成されたコレットと、該コレットに他端から嵌挿されるスリーブと、前記コレットのネジ部に捩じ込まれ、スリーブを前記一端部に向けて押込むナットとよりなることを特徴とする請求項1記載の補修方法で用いられる補助具。   One end portion can be inserted into an end portion of an anchor or the like from which a corroded portion has been cut off, is tapered toward the end, and can be reduced in diameter by being provided with slits at appropriate intervals in the circumferential direction. A collet in which a screw part is formed at a portion excluding the part, a sleeve fitted into the collet from the other end, and a nut that is screwed into the screw part of the collet and pushes the sleeve toward the one end part The assisting tool used in the repair method according to claim 1. 前記コレットが一端部をアンカー等の端部に差込み可能で、周方向に割り溝が入れられた構成である代わりに周方向に適当間隔で分割された複数のスリーブからなって、アンカー等の端部に組付けられることを特徴とする請求項6記載の補助具。   The collet has a structure in which one end portion can be inserted into an end portion of an anchor or the like, and a groove is formed in the circumferential direction. Instead, the collet includes a plurality of sleeves divided at appropriate intervals in the circumferential direction. The auxiliary tool according to claim 6, wherein the auxiliary tool is assembled to the part. コレット内にモルタルを充填したことを特徴とする請求項6又は7記載の補助具。   The auxiliary tool according to claim 6 or 7, wherein mortar is filled in the collet.
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JP2014055420A (en) * 2012-09-11 2014-03-27 Asahi Kasei Geotech Co Ltd Repair method of corroded anchor bolt fixation base
JP2015145607A (en) * 2014-01-31 2015-08-13 孝幸 阿部 Recovery method of ground anchor fastening device
CN105022925A (en) * 2015-07-28 2015-11-04 青岛理工大学 Optimization design method for reinforcing side slope by using prestressed anchor rod and composite soil nails
CN106759321A (en) * 2016-12-30 2017-05-31 山东大学 A kind of anchor pole and its construction technology for improving retaining wall bearing capacity
JP6209305B1 (en) * 2017-02-22 2017-10-04 株式会社アスコ大東 How to re-tension steel bar anchors
JP2018112015A (en) * 2017-01-13 2018-07-19 ライト工業株式会社 Bar attachment jig
KR20200034444A (en) * 2018-09-21 2020-03-31 정삼식 Restrain constructing method using reinforcement construction for ground anchor

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JP2004183293A (en) * 2002-12-02 2004-07-02 Nasu Denki Tekko Co Ltd Repair method for foundation for structure, and device for use in the same

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JP2004183293A (en) * 2002-12-02 2004-07-02 Nasu Denki Tekko Co Ltd Repair method for foundation for structure, and device for use in the same

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014055420A (en) * 2012-09-11 2014-03-27 Asahi Kasei Geotech Co Ltd Repair method of corroded anchor bolt fixation base
JP2015145607A (en) * 2014-01-31 2015-08-13 孝幸 阿部 Recovery method of ground anchor fastening device
CN105022925A (en) * 2015-07-28 2015-11-04 青岛理工大学 Optimization design method for reinforcing side slope by using prestressed anchor rod and composite soil nails
CN106759321A (en) * 2016-12-30 2017-05-31 山东大学 A kind of anchor pole and its construction technology for improving retaining wall bearing capacity
CN106759321B (en) * 2016-12-30 2020-01-24 山东大学 Anchor rod for improving bearing capacity of retaining wall and construction process thereof
JP2018112015A (en) * 2017-01-13 2018-07-19 ライト工業株式会社 Bar attachment jig
JP6209305B1 (en) * 2017-02-22 2017-10-04 株式会社アスコ大東 How to re-tension steel bar anchors
JP2018135709A (en) * 2017-02-22 2018-08-30 株式会社アスコ大東 Method for re-tensioning steel bar anchor
KR20200034444A (en) * 2018-09-21 2020-03-31 정삼식 Restrain constructing method using reinforcement construction for ground anchor
KR102167163B1 (en) * 2018-09-21 2020-10-16 정삼식 Restrain constructing method using reinforcement construction for ground anchor

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