JP2013113036A - Multiple anticorrosion cable and ground anchor tendon using the same - Google Patents

Multiple anticorrosion cable and ground anchor tendon using the same Download PDF

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JP2013113036A
JP2013113036A JP2011261660A JP2011261660A JP2013113036A JP 2013113036 A JP2013113036 A JP 2013113036A JP 2011261660 A JP2011261660 A JP 2011261660A JP 2011261660 A JP2011261660 A JP 2011261660A JP 2013113036 A JP2013113036 A JP 2013113036A
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cable
sheath
tension members
anchor
anticorrosion
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JP5804375B2 (en
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Masashi Oikawa
雅司 及川
Toshiaki Kido
俊朗 木戸
Yasuhiro Hoshino
康弘 星野
Motoyasu Nishino
元庸 西野
Akira Yamamoto
山本　　彰
Soichi Fujiwara
宗一 藤原
Seiichi Ishii
精一 石井
Junichi Yamazaki
淳一 山崎
Koichi Suga
浩一 菅
Kenji Okazaki
賢治 岡崎
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Obayashi Corp
Sumitomo SEI Steel Wire Corp
Nittoc Constructions Co Ltd
Sumitomo Mitsui Construction Co Ltd
Sanshin Corp
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Obayashi Corp
Sumitomo SEI Steel Wire Corp
Nittoc Constructions Co Ltd
Sumitomo Mitsui Construction Co Ltd
Sanshin Corp
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Abstract

PROBLEM TO BE SOLVED: To increase the reliability of the cutoff of a cable to be used for the reinforcement application of a concrete structure, and to prevent the intrusion of a corrosion factor to the inside by performing highly reliable cutoff even when a longitudinal anchor tendon is constituted.SOLUTION: A plurality of tendons 2 each of which has been anticorrosion proofed are twisted and bundled into one, and a shaping material 3 for averaging the outer diameters of a cable is arranged across the full length of the cable between the adjacent tendons 2 in the outermost periphery, and a cutoff 4 filling a gap between the tendons and the surrounding gap of the shaping material 3 is arranged across a length range which is 300 mm or more in at least one end of the cable, and a sheath 6 made of synthetic resin, lubricant 7, and a second sheath 8 are arranged in the outer periphery of the flux of the tendons. The gap between the tendons and the surrounding gap of the shaping material may be packed with a packing material 5 across the full length of the cable instead of the cutoff 4.

Description

この発明は、地盤や橋梁などのコンクリート構造物の補強に利用する多重防食ケーブルと、それを用いて耐久性の向上や小型化を図ったグラウンドアンカーテンドンに関する。   The present invention relates to a multiple anticorrosion cable used to reinforce a concrete structure such as a ground or a bridge, and a ground uncurtain dong that uses the same to improve durability and downsize.

首記のグラウンドアンカーテンドン（以下では単にテンドンと言う）は、ダム、防波堤、防潮堤などの補強、嵩上げ用などとして使用される。このテンドンは、複数本の緊張材を束ねて構成される。そのテンドンや橋梁用ＰＣ緊張材などとして使用可能な複合材ケーブルが、例えば、下記特許文献１に開示されている。   The first ground uncurtain dong (hereinafter simply referred to as tendon) is used to reinforce and raise dams, breakwaters, and seawalls. This tendon is configured by bundling a plurality of tendons. A composite material cable that can be used as a tendon or a bridge PC tension member is disclosed in, for example, Patent Document 1 below.

特許文献１に開示された複合材ケーブルは、複数本の緊張材を束ねてそれを合成樹脂製のシース（スリーブ）で覆い、シースの両端に止水具を取り付けてシース内全体に充填材を注入している。充填材は、膨張性セメントなどの膨張性のあるものを用いており、その充填材の膨張圧による摩擦でケーブルが定着される。   In the composite material cable disclosed in Patent Document 1, a plurality of tendons are bundled and covered with a synthetic resin sheath (sleeve), and a water stop is attached to both ends of the sheath to fill the entire sheath. Injecting. As the filler, an expandable material such as expandable cement is used, and the cable is fixed by friction caused by the expansion pressure of the filler.

特許第４２８８１２２号公報Japanese Patent No. 4288122

前掲の特許文献１が開示している複合材ケーブルは、緊張材を束ねたマルチケーブルをシースに挿入し、緊張材を緊張後にシース内に充填材を注入する仕様であり、従って、緊張前には、シースとシース内の緊張材間は空隙があるので、例えば、グラウンドアンカーとしての用途において全長が数十ｍ（３０ｍ程度）のテンドンに適用する場合には特に問題はないが、全長が相当長く、しかも、ダムの補強などを目的として鉛直方向に配設されるテンドンの場合、次のような問題が生じる。   The composite material cable disclosed in the above-mentioned Patent Document 1 is a specification in which a multi-cable bundle of tendon materials is inserted into a sheath, and after filling the tendon material, the filler is injected into the sheath. Since there is a gap between the sheath and the tendon in the sheath, there is no particular problem when applied to a tendon with a total length of several tens of meters (about 30 m) in use as a ground anchor. In the case of a tendon that is long and is arranged vertically for the purpose of reinforcing a dam, the following problems arise.

即ち、全長が３０ｍを超えるようなテンドンは、削孔した孔内の水やアンカー体形成のためのテンドン挿入後に注入するグラウトの圧力が高くなる（例えば、全長１００ｍでのグラウトの圧力は２ＭＰａを超える）ことから、止水性に不安が残る。万一、止水性が保たれず、シース内にグラウトが流入すると緊張ができなくなる。その懸念があるのに、グラウトの注入は目視確認ができないためリスクが高い。また、グラウト圧によってシースが変形することも懸念される。   That is, the tendon having a total length exceeding 30 m increases the pressure of the grout injected after insertion of the water in the drilled hole or the tendon for forming the anchor body (for example, the pressure of the grout at the total length of 100 m is 2 MPa. Therefore, anxiety remains about water-stopping. In the unlikely event that the water stoppage is not maintained, if the grout flows into the sheath, tension cannot be obtained. Despite that concern, grout injection is risky because visual confirmation is not possible. There is also a concern that the sheath is deformed by the grout pressure.

止水の信頼性が低いと、ケーブル端より緊張材間の隙間を通って腐食因子（主に水）が内部に浸入し、緊張用ケーブルやそれを用いたテンドンの耐久性が低下する。また、シースが変形すると、シースが破れたり、ケーブルの緊張に支障が出たりする。   When the reliability of water stoppage is low, the corrosion factor (mainly water) penetrates into the inside through the gap between the tension members from the end of the cable, and the durability of the tension cable and the tendon using the same decreases. Further, when the sheath is deformed, the sheath is broken or the cable tension is disturbed.

そこで、この発明は、コンクリート構造物の補強用途などに利用されるケーブルの止水の信頼性を高めること、特に、長尺のアンカーテンドンを構成したときにも信頼性の高い止水が行われて腐食因子の内部への浸入が防止されるようにすることを課題としている。   Accordingly, the present invention increases the reliability of water stoppage for cables used for reinforcement of concrete structures and the like, and in particular, highly reliable water stoppage is performed even when long uncurtain dongs are configured. Therefore, it is an object to prevent the intrusion of corrosion factors into the interior.

上記の課題を解決するため、この発明においては、コンクリート構造物補強用のケーブルを以下の通りの多重防食ケーブルに構成した。即ち、各々が防食加工された複数本の緊張材を撚り合わせてひとつに束ね、最外周の隣り合う緊張材間にケーブルの外径を均す整形材をケーブルの全長に亘って配置した。また、ケーブルの少なくとも片端において各緊張材間の隙間と前記整形材の周囲の隙間を埋める止水材を３００ｍｍ以上の長さ範囲に亘って配置し、この緊張材の束の外周に合成樹脂の第１シースを設けた。   In order to solve the above problems, in the present invention, the cable for reinforcing a concrete structure is configured as a multiple anticorrosion cable as follows. That is, a plurality of tension members each anticorrosion-processed are twisted and bundled together, and a shaping material that equalizes the outer diameter of the cable is disposed over the entire length of the cable between adjacent tension members on the outermost periphery. Further, at least one end of the cable, a water stop material that fills the gap between the tension members and the gap around the shaping material is arranged over a length range of 300 mm or more, and the synthetic resin is placed on the outer periphery of the bundle of the tension materials. A first sheath was provided.

なお、前記整形材は、ＰＰ（ポリプロピレン）などの条材などが適し、また、整形に発泡ウレタンや粘土などの材料を用いることも可能である。止水材は、ウレタン系樹脂などの水膨張性樹脂がよく、また、シリコーン樹脂などを用いることも可能である。   In addition, as the shaping material, a strip material such as PP (polypropylene) is suitable, and a material such as urethane foam or clay can be used for shaping. The water-stopping material is preferably a water-expandable resin such as a urethane resin, and a silicone resin or the like can also be used.

この多重防食性ケーブルは、各緊張材間の隙間と前記整形材の周囲の隙間を埋めるグリースやワックスなどの充填材を追設し、その充填材を前記水膨張性止水材の設置領域を除く領域に配置しても構わない。   This multi-corrosion-proof cable is additionally provided with a filler such as grease or wax that fills the gaps between the tension members and the gap around the shaping material, and the filler is used as an area for installing the water-expandable waterproofing material. You may arrange | position in the area | region except.

また、その充填材を採用するものは、ケーブルの少なくとも片端に水膨張性止水材を配置することに代えてその充填材をケーブルの全長に亘って配置し、各緊張材間の隙間と前記整形材の周囲の隙間を充填材のみで埋める構造にしてもよい。   In addition, in the case of using the filler, the filler is disposed over the entire length of the cable instead of disposing the water-expandable water stop material at least at one end of the cable, You may make it the structure which fills the clearance gap around a shaping material only with a filler.

長尺ケーブルの場合、シース施工後にシースの内側に充填材を圧入する方法では、グリースやワックスなどの充填材を止水の信頼性を十分に確保できるだけの長さ範囲に封入することができない。そこで、この発明においては、予め充填材を塗布した緊張材を撚り合せ、さらに、予め充填材を塗布した整形材を配置し、その後にシースを施すようにした。これにより、圧入による封入が不可能な長さ領域に充填材を充填することができる。   In the case of a long cable, the method of press-fitting a filler into the inside of the sheath after construction of the sheath cannot enclose a filler such as grease or wax in a length range that can sufficiently ensure the reliability of water stoppage. Therefore, in the present invention, the tension material previously applied with the filler is twisted, and the shaping material previously applied with the filler is disposed, and then the sheath is applied. As a result, the filler can be filled in a length region that cannot be sealed by press fitting.

この多重防食ケーブルは、シースを、前記緊張材の束の中の最外周の緊張材に接触させて緊張材の束と一体化させると好ましい。この構造によれば、緊張材の束とシースが緊張時に一体になって挙動し、内部の止水材や充填材が安定して保持されてその止水材や充填材による腐食因子浸入阻止機能の低下が起こり難い。   In this multi-corrosion-proof cable, it is preferable that the sheath is brought into contact with the outermost peripheral tension member in the tension member bundle to be integrated with the tension member bundle. According to this structure, the bundle of the tension material and the sheath behave together when tensioned, and the internal water-stopping material and filler are stably held, and the water-stopping material and filler prevent the invasion of corrosion factors. Is unlikely to occur.

上記多重ケーブルで用いるシースを第１シースとすると、その第１シースの外周に潤滑剤を塗布し、その潤滑剤を含めて全体の外周を包囲する合成樹脂の第２シースを最外周に設けるのも好ましい。これは、第２シースが固化したグラウトに拘束されても第１シースは固定されず、そのために、緊張材の緊張時の伸びが邪魔されず、補強対象のコンクリート構造物に安定して圧縮荷重を加えることができる。   When the sheath used in the multiplex cable is a first sheath, a lubricant is applied to the outer periphery of the first sheath, and a second sheath of synthetic resin surrounding the entire outer periphery including the lubricant is provided on the outermost periphery. Is also preferable. This is because even if the second sheath is constrained by the solidified grout, the first sheath is not fixed. Therefore, the tension material is not obstructed from being stretched, and the concrete structure to be reinforced is stably compressed. Can be added.

この発明は、アンカー設置孔の底部側領域に一体固定されるアンカー体長部と、そのアンカー体長部に連続して地表面側がアンカー頭部の定着部に固定される自由長部とを有し、そのアンカー体長部と自由長部を複数本の緊張材をひとつに束ねた一連の緊張材で構成し、そのアンカー体長部と自由長部との境界にテンドンの外周部を覆う保護体を設置したグラウンドアンカーテンドンも併せて提供する。   This invention has an anchor body length part integrally fixed to the bottom side region of the anchor installation hole, and a free length part in which the ground surface side is fixed to the anchor part of the anchor head continuously to the anchor body length part, The anchor body length part and the free length part consisted of a series of tendon materials bundled with multiple tendon materials, and a protective body covering the outer periphery of tendon was installed at the boundary between the anchor body length part and the free length part A ground uncurtain dong is also provided.

そのテンドンは、前記自由長部のアンカー頭部の定着部に固定される部分を除いた領域（所要箇所）にこの発明の多重防食ケーブルの構造を、水膨張性止水材を有するものについてはその前記水膨張性止水材が自由長部の下側に置かれる配置にして適用しており、そこに特徴を有する。   The tendon has the structure of the multi-corrosion-proof cable of the present invention in a region (required portion) excluding the portion fixed to the anchoring portion of the anchor head of the free length portion, and the one having a water-expandable water stop material. The water-swellable water-stopping material is applied so as to be placed under the free length portion, and has a characteristic.

なお、複数本の緊張材を束ねて外周にシースを施したケーブルをさらに複数本束ねて構成するテンドンは、外接円内における緊張材の配置にロスが生じてテンドンの外径が大きくなる上に、ケーブル相互間に摩擦が生じてテンドンを構成する全ケーブルの均一な緊張が難しくなる。   In addition, the tendon that consists of a plurality of cables that are bundled with a plurality of tendons and sheathed on the outer periphery, the loss of the placement of the tendons in the circumscribed circle increases the tendon outer diameter. In addition, friction is generated between the cables, and uniform tensioning of all the cables constituting the tendon becomes difficult.

これに対し、この発明のテンドンは、複数本の緊張材を撚り合わせてひとつに束ね、その外周をシースで覆う構造にしたので、外接円内における緊張材の配置効率を高めてテンドンの外径を小さくすることができる。また、束ねた緊張材は一体で挙動するために、各緊張材の緊張力の均一化も図れる。   On the other hand, the tendon of the present invention has a structure in which a plurality of tendons are twisted together and bundled together and the outer periphery thereof is covered with a sheath, so that the arrangement efficiency of the tendons within the circumscribed circle is increased and the tendon outer diameter is increased. Can be reduced. In addition, since the bundled tension members behave integrally, the tension force of each tension material can be made uniform.

この発明の多重防食ケーブルは、各々が防食加工された複数本の緊張材を組み合わせている。また、最外周の隣り合う緊張材間にケーブルの外径を均す整形材をケーブルの全長に亘って配置し、各緊張材間の隙間と前記整形材の周囲の隙間をケーブルの少なくとも片端に設ける止水材や、ケーブルの全長に亘って設ける充填材で埋めており、そのために、ケーブルの内部に加わる圧力が高くなる用途でも安定した止水がなされる。   The multiple anticorrosion cable of the present invention combines a plurality of tendon materials each of which is anticorrosive processed. In addition, a shaping material that equalizes the outer diameter of the cable between adjacent tension members on the outermost circumference is arranged over the entire length of the cable, and a gap between the tension materials and a gap around the shaping material are at least at one end of the cable. It is filled with a water-stopping material to be provided or a filler provided over the entire length of the cable, so that stable water-stopping is achieved even in applications where the pressure applied to the inside of the cable is high.

ケーブル端の内部の隙間を水膨張性止水材で埋めたものは、その止水材がケーブル内に浸入しようとする水分を吸収して膨張し、隙間の封止性能を増強させる。また、充填材のみで隙間を埋めるものは、シース施工後に圧入充填する方法では不可能な長さ（例えば３０ｍ以上）範囲に充填材を充填しており、そのために、この発明の多重防食ケーブルとそのケーブル構造を自由長部に採用したこの発明のテンドンは、ケーブルの内部に対する腐食因子の浸入が防止されて腐食防止の信頼性が高まる。   When the gap inside the cable end is filled with a water-expandable water-stopping material, the water-stopping material absorbs moisture that is about to enter the cable and expands, thereby enhancing the sealing performance of the gap. In addition, the one that fills the gap with only the filler is filled with a filler in a length (for example, 30 m or more) that is impossible with the method of press-fitting after the sheath construction. The tendon of the present invention adopting the cable structure for the free length portion prevents the corrosion factor from entering the inside of the cable and increases the reliability of corrosion prevention.

また、最外周の隣り合う緊張材間の隙間にスペーサとして機能する整形材を配置しているので、グラウト圧などによるシースの変形も抑制されてシース変形に伴う不具合が回避される。   Moreover, since the shaping material which functions as a spacer is arrange | positioned in the clearance gap between the adjacent tension materials of outermost periphery, the deformation | transformation of the sheath by a grout pressure etc. is suppressed and the malfunction accompanying a sheath deformation | transformation is avoided.

この発明の多重防食ケーブルの基本形態を示す断面図Sectional drawing which shows the basic form of the multiplex anticorrosion cable of this invention 外周に２重にシースを施した多重防食ケーブルの断面図Cross section of multiple anticorrosion cable with double sheath on outer periphery 防食加工された緊張材の断面図Cross section of anticorrosive tension material この発明のグラウンドアンカーテンドンの一例を示す断面図Sectional drawing which shows an example of the ground uncurtain don of this invention

以下、添付図面の図１〜図４に基づいて、この発明の多重防食ケーブルとグラウンドアンカーテンドンの実施の形態を説明する。   Hereinafter, based on FIGS. 1 to 4 of the accompanying drawings, embodiments of the multiple anticorrosion cable and the ground uncurtain don of the present invention will be described.

この発明の多重防食ケーブルの一例を図１、図２に示す。図１の多重防食ケーブル１は、各々が防食加工された複数本の緊張材２を撚り合わせてひとつに束ねている。また、緊張材束の外周の窪んだ箇所にケーブルの外径を均す整形材３をケーブルの全長に亘って配置している。   An example of the multiple anticorrosion cable of the present invention is shown in FIGS. The multiple anticorrosion cable 1 in FIG. 1 is formed by twisting and bundling a plurality of tension members 2 each of which is anticorrosion processed. Moreover, the shaping material 3 which equalizes the outer diameter of a cable is arrange | positioned over the full length of a cable in the recessed part of the outer periphery of a tension material bundle.

そしてさらに、ケーブルの少なくとも片端において各緊張材２，２間の隙間と整形材３の周囲の隙間を埋める止水材４を、３００ｍｍ以上の長さ範囲に亘って配置し、整形材３と外周の止水材４を含めて全体の外周を合成樹脂のシース６で覆って多重防食ケーブルを完成させている。   Further, a waterproofing material 4 that fills the gap between the tension members 2 and 2 and the gap around the shaping material 3 at least at one end of the cable is arranged over a length range of 300 mm or more, and the shaping material 3 and the outer periphery The entire outer periphery including the water blocking material 4 is covered with a synthetic resin sheath 6 to complete a multiple anticorrosion cable.

緊張材２は、図３に示すように、ＰＣ鋼より線２ａをエポキシ樹脂やポリエチレンなどの合成樹脂２ｂで被覆して発錆を防止したものを用いている。この防食加工された緊張材２を、真円に極力近似した断面を持つように撚り合わせて一つに束ね、最外周の隣り合う緊張材２，２間にケーブルの外径（緊張材の束の外径）を均す整形材３を縦添えして緊張材２，２間の窪みをその整形材３で埋めている。なお、ＰＣ鋼より線２ａは合成樹脂で被覆したものに限定されず、亜鉛めっきしたものや防食加工のないものも適用可能である。   As shown in FIG. 3, the tension material 2 is made of a PC steel wire 2a covered with a synthetic resin 2b such as epoxy resin or polyethylene to prevent rusting. This anticorrosive tension material 2 is twisted so as to have a cross section approximated to a perfect circle as much as possible, and bundled together, and the outer diameter of the cable (bundled tension material) between adjacent tension materials 2 and 2 on the outermost periphery. A shaping material 3 that equalizes the outer diameter of the tension material 2 is vertically provided, and the depression between the tension materials 2 and 2 is filled with the shaping material 3. Note that the PC steel stranded wire 2a is not limited to the one coated with a synthetic resin, and a galvanized one and one having no anticorrosion processing are applicable.

整形材３は、ここではＰＰのロープを用いたが、ＰＰ以外の樹脂や天然繊維で形成された繊維ロープなどの条材や発泡ウレタンなどの発泡樹脂を使用してもよい。   As the shaping material 3, a PP rope is used here, but a strip material such as a fiber rope formed of a resin other than PP or a natural fiber, or a foamed resin such as urethane foam may be used.

止水材４は、水膨張性のあるウレタン系樹脂を使用し、それを、理想的には全長であるが、経済的な効率を考えてケーブルの少なくとも片端の３００ｍｍ〜１０００ｍｍの長さ範囲に亘る領域に設けている。   The water-stopping material 4 uses a water-expandable urethane-based resin, which is ideally the entire length, but considering the economic efficiency, it is in a length range of 300 mm to 1000 mm at least at one end of the cable. It is provided in the extended area.

この止水材４は、緊張材２を撚り合せるときに各緊張材２間の隙間に配置し、さらに、整形材を配置するときにその整形材の周囲に配置し、その後にシース６を押出成形によって被覆している。   The water stop material 4 is disposed in the gap between the tension members 2 when twisting the tension members 2, and further disposed around the shaping material when the shaping material is disposed, and then the sheath 6 is extruded. Covered by molding.

止水材４を設置した領域以外の領域における各緊張材間の隙間と整形材３の周囲の隙間も、充填材５を追設してその充填材５で埋めることができる。この構造は、より高い止水の信頼性が求められる場合に有効である。   A gap between the tension members and a gap around the shaping material 3 in a region other than the region where the water stop material 4 is installed can also be filled with the filler 5 by additionally installing the filler 5. This structure is effective when higher water stoppage reliability is required.

充填材５は、適度に粘性のあるグリースやワックスなどでよい。この充填材は、シース施工後の圧入充填では設置範囲が制限されるので、予め充填材を塗布した緊張材を撚り合せ、さらに、撚り合わせた緊張材２の束の外周に予め充填材５を塗布した整形材３を配置し、その後に第１シース６を施す。   The filler 5 may be grease or wax having moderate viscosity. Since the installation range of this filler is limited in press-fitting after sheath construction, the tension material previously coated with the filler is twisted, and the filler 5 is preliminarily placed on the outer periphery of the twisted tension material 2 bundle. The applied shaping material 3 is arranged, and then the first sheath 6 is applied.

この方法で充填材５を設けるケーブルは、充填材５をケーブルの全長に亘って配置し、止水材を用いずに各緊張材間の隙間と整形材３の周囲の隙間を充填材５のみで埋める構造にしてもよい。   In the cable in which the filler 5 is provided by this method, the filler 5 is arranged over the entire length of the cable, and the gap between the tension members and the gap around the shaping material 3 are formed only by the filler 5 without using the water stop material. The structure may be filled with.

図２の多重防食ケーブル１は、図１の多重防食ケーブル１のシース６を第１シースと考えてその第１シースの外周にグリースなどの潤滑剤７を塗布し、その潤滑剤７を含めて全体の最外周にさらに合成樹脂の第２シース８を設けている。   In the multiple anticorrosion cable 1 of FIG. 2, the sheath 6 of the multiple anticorrosion cable 1 of FIG. 1 is considered as a first sheath, and a lubricant 7 such as grease is applied to the outer periphery of the first sheath, and the lubricant 7 is included. A synthetic resin second sheath 8 is further provided on the entire outermost periphery.

多重防食ケーブルをアンカーテンドンなどとして使用する場合、最外周のシースが硬化したグラウトによって拘束される。シースが２重に施されていれば、第２シース８が拘束されても第１シース６は第２シースに対して摺動可能であるので、安定した緊張が保証され、緊張材の再緊張も支障なく行える。   When using a multiple anticorrosion cable as an uncurtain dong or the like, the outermost sheath is restrained by a hardened grout. If the sheath is applied twice, even if the second sheath 8 is restrained, the first sheath 6 can slide relative to the second sheath, so that stable tension is ensured and the tension material is re-tensioned. Can be done without any problem.

第２シース８は、第１シース６を破れ難くするのにも役立つが、多重防食ケーブルの用途によっては、不要な場合がある。   Although the 2nd sheath 8 is useful also to make the 1st sheath 6 hard to tear, it may be unnecessary depending on the use of a multiple anticorrosion cable.

図１、図２の多重防食ケーブル１は、防食加工された複数本の緊張材を、整形材を含ませることで真円に近似した断面を持つように撚り合わせてひとつの束にしており、外径が小さく抑えられる。   The multiple anticorrosion cable 1 in FIG. 1 and FIG. 2 is made by twisting together a plurality of anticorrosive tension materials so as to have a cross section approximate to a perfect circle by including a shaping material, The outer diameter can be kept small.

図４は、図２の多重防食ケーブルの構造を一部に適用して構成したグラウンドアンカーテンドンの具体例である。このグラウンドアンカーテンドン１０は、アンカー設置孔２０の底部側領域に一体固定されるアンカー体長部１１と、そのアンカー体長部に連続して地表面側がアンカー頭部の定着部１３に固定される自由長部１２を有する。   FIG. 4 is a specific example of a ground uncurtain dong constructed by partially applying the structure of the multiple anticorrosion cable of FIG. This ground uncurtain dong 10 has an anchor body length portion 11 that is integrally fixed to the bottom side region of the anchor installation hole 20, and a free length in which the ground surface side is continuously fixed to the anchor portion fixing portion 13 of the anchor body length portion. Part 12.

アンカー体長部１１と自由長部１２は、各々が防食加工された複数本の緊張材２を、必要箇所（自由長部１２の地表側を除く部分）で撚り合わせてひとつに束ねた一連の緊張材を用いて構成している。   The anchor body length part 11 and the free length part 12 are a series of tensions in which a plurality of tension members 2 each of which is anticorrosion-processed are twisted and bundled together at necessary places (excluding the ground surface side of the free length part 12). It consists of materials.

アンカー体長部１１は、緊張材の束をコルゲートシース１１ａで覆い、そのコルゲートシース１１ａの外周の長手方向途中にアンカー体長部１１をアンカー設置孔２０の中心に保持するセンタリング部材１１ｂを設置し、さらに、緊張材の束とコルゲートシース１１ａとの間にスペーサ１１ｃを適宜間隔で配置し、スペーサ１１ｃで確保された空間にセメントグラウトなどの充填材を注入し、緊張材とコルゲートシース１１ａを一体化させる。
コルゲートシース１１ａ内にセメントグラウトを注入する方法としては、アンカー設置孔２０にグラウンドアンカーテンドンを挿入する前に注入する方法、アンカー設置孔２０にグラウンドアンカーテンドンを挿入後に注入する方法がある。グラウンドアンカーテンドンを挿入後の場合では、グラウトホースによりコルゲートシース１１ａに直接注入する方法と、コルゲートシース１１ａの下端を開口としておきアンカー設置孔２０へのグラウト１５を注入する際に併せて注入する方法もある。 The anchor body length portion 11 covers a bundle of tendons with a corrugated sheath 11a, and a centering member 11b that holds the anchor body length portion 11 at the center of the anchor installation hole 20 is installed in the middle of the outer periphery of the corrugated sheath 11a. The spacers 11c are arranged at appropriate intervals between the bundle of the tension material and the corrugated sheath 11a, and a filler such as cement grout is injected into the space secured by the spacer 11c, thereby integrating the tension material and the corrugated sheath 11a. .
As a method of injecting cement grout into the corrugated sheath 11a, there are a method of injecting the ground uncurtain dong into the anchor installation hole 20, and a method of injecting the ground uncurtain dong into the anchor installation hole 20 after the insertion. In the case of inserting the ground uncurtain dong, a method of injecting directly into the corrugated sheath 11a with a grout hose and a method of injecting the grout 15 into the anchor installation hole 20 with the lower end of the corrugated sheath 11a as an opening. There is also.

また、自由長部１２は、定着部１３に固定される地表面側以外の領域（緊張材が束ねられた領域）に図２の多重防食ケーブルの構造を、水膨張性止水材４の設置部が自由長部１２の下側に配置される状態にして適用し、その多重防食ケーブルの上端と下端の外周に第２シース８の口を閉じる潤滑剤封入用Ｏリング１２ａを装着している。   In addition, the free length portion 12 has the structure of the multiple anticorrosion cable of FIG. 2 installed in the region other than the ground surface side (region where the tension material is bundled) fixed to the fixing portion 13 and the water-expandable water stop material 4 is installed. This is applied in such a state that the portion is disposed below the free length portion 12, and a lubricant encapsulating O-ring 12a for closing the mouth of the second sheath 8 is mounted on the outer periphery of the upper end and the lower end of the multiple anticorrosion cable. .

そして、さらに、そのケーブルの長手途中の外周にセンタリング部材１２ｂを設置し、自由長部１２の地表面側に、水密封止のための止水用Ｏリング１２ｃ、トランペットシース１２ｄ、及び熱収縮チューブ１２ｅを設けている。   Further, a centering member 12b is installed on the outer periphery in the middle of the length of the cable, and on the ground surface side of the free length portion 12, a water-stop O-ring 12c for watertight sealing, a trumpet sheath 12d, and a heat shrinkable tube 12e is provided.

さらに、アンカー体長部１１の地表側の端部と自由長部１２のアンカー設置孔の穴底側端部の境界部に、コルゲートシース１１ａと自由長部の第２シース８を連結する異種接続管１４ａと熱収縮チューブ１４ｂを組み合わせた保護体１４を設けている。   Further, the heterogeneous connecting pipe that connects the corrugated sheath 11a and the second sheath 8 of the free length portion to the boundary between the end of the anchor body length portion 11 on the ground surface side and the bottom end portion of the anchor installation hole of the free length portion 12 The protector 14 which combined 14a and the heat contraction tube 14b is provided.

このほか、定着部１３は、アンカープレート１３ａ上に止水プレート１３ｂを介してアンカーディスク１３ｃを配置し、そのアンカーディスク１３ｃにウエッジ１３ｄを使用して各緊張材を定着させ、アンカーディスク１３ｃの外周にキャップ１３ｅを被せている。   In addition, the fixing unit 13 arranges the anchor disk 13c on the anchor plate 13a via the water stop plate 13b, and fixes each tension material to the anchor disk 13c using the wedge 13d. Is covered with a cap 13e.

このように構成したテンドンは、アンカー設置孔２０内に配置し、そのアンカー設置孔２０の入口に漏れ止めプレート（図示せず）と架設台（これも図示せず）を設置し、架設台でアンカーディスク１３ｃをグラウト注入に支障をきたさない位置に仮保持してアンカー設置孔２０にグラウト１５を注入する。そして、その後にアンカープレート１３ａ、止水プレート１３ｂ、アンカーディスク１３ｃを配置し、グラウト１５の固化後に各緊張材２を緊張して定着部１３で定着させ、定着部にキャップ１３ｅを被せて補強用のアンカーを構成する。   The tendon constructed as described above is placed in the anchor installation hole 20, and a leak-proof plate (not shown) and a construction base (also not shown) are installed at the entrance of the anchor installation hole 20, The anchor disk 13c is temporarily held at a position that does not interfere with the grout injection, and the grout 15 is injected into the anchor installation hole 20. After that, an anchor plate 13a, a water stop plate 13b, and an anchor disk 13c are arranged. After the grout 15 is solidified, the tension members 2 are tensioned and fixed at the fixing portion 13, and the fixing portion is covered with a cap 13e for reinforcement. Configure the anchor.

自由長部１２の下端側は口を閉じているが、グラウト圧が高くなる用途では腐食因子の浸入防止に関する信頼性をより高めることが要求される。この発明のテンドンは、自由長部の下端側のケーブル内隙間が止水材４によって封止され、或いは、自由長部１２のアンカーヘッドに固定される地表側を除く部分の全域（従来の防食ケーブルでは不可能な長さ範囲が）が充填材によって封止されているので、印加圧力が高くなっても安定した止水がなされ、これにより、腐食防止の信頼性が高まる。   The lower end side of the free length portion 12 has a closed mouth. However, in applications where the grout pressure is increased, it is required to further improve the reliability with respect to prevention of corrosion factor intrusion. In the tendon of the present invention, the gap in the cable on the lower end side of the free length portion is sealed by the water blocking material 4, or the entire area excluding the ground surface side fixed to the anchor head of the free length portion 12 (conventional anticorrosion) Since a length range that is impossible with a cable) is sealed with a filler, stable water stoppage is achieved even when the applied pressure is increased, thereby increasing the reliability of corrosion prevention.

また、テンドンが単一のケーブルで構成されているので、複数本の個々にシースを施した緊張材をさらに複数本束ねて構成されるテンドンで問題になる緊張材とケーブルの摩擦が起こらず、各緊張材の均一緊張も可能になる。   In addition, since tendon is made up of a single cable, there is no friction between the tendon and the cable, which is a problem with tendons that are made up of a plurality of tendons that are individually sheathed. Uniform tension of each tendon is also possible.

さらに、今仮に、エポキシストランド１９Ｓ１５．２（１９本のより線をＳ撚りした外径１５．２ｍｍのストランド）を採用したとすると、シース６の外径はφ９５ｍｍ、第２シース８の外径はφ１０５ｍｍであり、それを収納するためのアンカー設置孔の穿孔径が小さくて済む。例えば、このケースでのアンカー設置孔２０の外径は、φ２２５ｍｍあればよく、アンカー設置孔の穿孔コストも低減可能となる。   Furthermore, suppose now that the epoxy strand 19S15.2 (a strand having an outer diameter of 15.2 mm obtained by S twisting 19 strands) is adopted, the outer diameter of the sheath 6 is φ95 mm, and the outer diameter of the second sheath 8 is The diameter is φ105 mm, and the diameter of the anchor installation hole for storing it is small. For example, the outer diameter of the anchor installation hole 20 in this case may be φ225 mm, and the drilling cost of the anchor installation hole can be reduced.

なお、この発明の多重防食ケーブルは、ダムアンカーや防潮堤の補強、嵩上げに利用されるグラウンドアンカーテンドン用として好適に利用できるが、用途はそれに限定されない。一般的なグランドアンカー用の緊張材、コンクリート構造物の補強材、橋桁などの吊下材などとしても使用することができる。   In addition, although the multi-corrosion-proof cable of this invention can be utilized suitably for the ground uncurtain dong used for reinforcement and raising of a dam anchor or a seawall, a use is not limited to it. It can also be used as a general tension material for ground anchors, a reinforcing material for concrete structures, and a suspension material for bridge girders.

１ 多重防食ケーブル
２ 緊張材
２ａ ＰＣ鋼より線
２ｂ 合成樹脂
３ 整形材
４ 水膨張性止水材
５ 充填材
６ シース
７ 潤滑剤
８ 第２シース
１０ グラウンドアンカーテンドン
１１ アンカー体長部
１１ａ コルゲートシース
１１ｂ センタリング部材
１１ｃ スペーサ
１２ 自由長部
１２ａ 潤滑剤封入用Ｏリング
１２ｂ センタリング部材
１２ｃ 止水用Ｏリング
１２ｄ トランペットシース
１２ｅ 熱収縮チューブ
１３ 定着部
１３ａ アンカープレート
１３ｂ 止水プレート
１３ｃ アンカーディスク
１３ｄ ウエッジ
１３ｅ キャップ
１４ 保護体
１４ａ 異種接続管
１４ｂ 熱収縮チューブ
１５ グラウト
２０ アンカー設置孔 DESCRIPTION OF SYMBOLS 1 Multi-corrosion-proof cable 2 Tension | tensile_strength material 2a PC steel strand 2b Synthetic resin 3 Shaping material 4 Water-expandable waterproofing material 5 Filler 6 Sheath 7 Lubricant 8 Second sheath 10 Ground uncurtain don 11 Anchor body length part 11a Corrugated sheath 11b Centering Member 11c Spacer 12 Free length portion 12a Lubricant-sealed O-ring 12b Centering member 12c Water-stopping O-ring 12d Trumpet sheath 12e Heat shrinkable tube 13 Fixing portion 13a Anchor plate 13b Water-stop plate 13c Anchor disk 13d Wedge 13e Cap 14 Protective body 14a Heterogeneous connecting pipe 14b Heat shrinkable tube 15 Grout 20 Anchor installation hole

Claims (7)

各々が防食加工された複数本の緊張材（２）を撚り合わせてひとつに束ね、最外周の隣り合う緊張材（２，２）間にケーブルの外径を均す整形材（３）をケーブルの全長に亘って配置し、さらに、ケーブルの少なくとも片端において各緊張材（２）間の隙間と前記整形材（３）の周囲の隙間を埋める止水材（４）を３００ｍｍ以上の長さ範囲に亘って配置し、この緊張材の束の外周に合成樹脂のシース（６）を設けたコンクリート構造物補強用多重防食ケーブル。   A plurality of tension members (2) each coated with anticorrosion are twisted and bundled together, and a shaping material (3) that equalizes the outer diameter of the cable between adjacent tension members (2, 2) on the outermost periphery is cabled Further, the water stop material (4) that fills the gap between the tension members (2) and the gap around the shaping material (3) at least at one end of the cable has a length range of 300 mm or more. A multi-corrosion-proof cable for reinforcing concrete structures in which a sheath (6) of synthetic resin is provided on the outer periphery of the bundle of tendons. 前記止水材（４）として、水膨張性樹脂を用いた請求項１に記載のコンクリート構造物補強用多重防食ケーブル。   The multiple anticorrosion cable for reinforcing a concrete structure according to claim 1, wherein a water-expandable resin is used as the water blocking material (4). 各緊張材（２）間の隙間と前記整形材（３）の周囲の隙間を埋める充填材（５）を追設し、その充填材（５）を前記止水材（４）の設置領域を除く領域に配置した請求項１又は２に記載のコンクリート構造物補強用多重防食ケーブル。   A filler (5) that fills the gaps between the tension members (2) and the gap around the shaping material (3) is additionally provided, and the filler (5) is provided as an installation area for the waterstop material (4). The multiple anticorrosion cable for reinforcing a concrete structure according to claim 1 or 2, which is disposed in an excluded region. 各々が防食加工された複数本の緊張材（２）を撚り合わせてひとつに束ね、最外周の緊張材（２）間にケーブルの外径を均す整形材（３）をケーブルの全長に亘って配置し、さらに、各緊張材（２）間の隙間と前記整形材（３）の周囲の隙間を埋める充填材（５）をケーブルの全長に亘って配置し、この緊張材の束の外周に合成樹脂のシース（６）を設けたコンクリート構造物補強用多重防食ケーブル。   A plurality of tension members (2) each coated with anticorrosion are twisted and bundled together, and a shaping material (3) that equalizes the outer diameter of the cable between the outermost tension members (2) is stretched over the entire length of the cable. Furthermore, a filler (5) that fills the gaps between the tension members (2) and the gaps around the shaping material (3) is arranged over the entire length of the cable, and the outer circumference of the bundle of tension members A multi-corrosion-proof cable for reinforcing concrete structures with a synthetic resin sheath (6). 前記シース（６）を、前記緊張材（２）の束と一体化させた請求項１〜４のいずれかに記載のコンクリート構造物補強用多重防食ケーブル。   The multiple anticorrosion cable for reinforcing concrete structures according to any one of claims 1 to 4, wherein the sheath (6) is integrated with the bundle of the tendon (2). 前記シース（６）の外周に潤滑剤（７）を塗布し、その潤滑剤を含めて全体の外周を包囲する合成樹脂の第２シース（８）を最外周に設けた請求項１〜５のいずれかに記載のコンクリート構造物補強用多重防食ケーブル。   The lubricant (7) is applied to the outer periphery of the sheath (6), and a synthetic resin second sheath (8) surrounding the entire outer periphery including the lubricant is provided on the outermost periphery. A multiple anticorrosion cable for reinforcing a concrete structure according to any one of the above. アンカー設置孔（２０）の底部側領域に一体固定されるアンカー体長部（１１）と、そのアンカー体長部に連続し、地表面側がアンカー頭部の定着部（１３）に固定される自由長部（１２）を有し、そのアンカー体長部（１１）と自由長部（１２）を、各々が防食加工された複数本の緊張材（２）をひとつに束ねた一連の緊張材で構成し、そのアンカー体長部（１１）と自由長部（１２）との境界にテンドンの外周を覆う保護体（１４）を設置したグラウンドアンカーテンドンであって、
前記自由長部（１２）の前記アンカー頭部の定着部（１３）に固定される部分を除いた領域に請求項１〜６のいずれかに記載の多重防食ケーブル（１）の構造を、前記止水材（４）を有するものについてはその前記止水材（４）が自由長部（１２）の下側に置かれる配置にして適用したグラウンドアンカーテンドン。 An anchor body length part (11) integrally fixed to the bottom side region of the anchor installation hole (20), and a free length part that is continuous to the anchor body length part and whose ground surface side is fixed to the anchoring part (13) of the anchor head (12), and the anchor body length part (11) and the free length part (12) are constituted by a series of tension members each of which is bundled with a plurality of tension members (2) each subjected to anticorrosion processing, A ground uncurtain dong in which a protective body (14) covering the outer periphery of tendon is installed at the boundary between the anchor body length part (11) and the free length part (12),
The structure of the multiple anticorrosion cable (1) according to any one of claims 1 to 6, in a region excluding a portion fixed to the anchor portion (13) of the anchor head of the free length portion (12), About the thing which has a water stop material (4), the said ground water stop material (4) is the ground uncurtain don applied by the arrangement | positioning placed under a free length part (12).
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