JP2003321901A - Composite pc steel material and its fixture - Google Patents
Composite pc steel material and its fixtureInfo
- Publication number
- JP2003321901A JP2003321901A JP2002128198A JP2002128198A JP2003321901A JP 2003321901 A JP2003321901 A JP 2003321901A JP 2002128198 A JP2002128198 A JP 2002128198A JP 2002128198 A JP2002128198 A JP 2002128198A JP 2003321901 A JP2003321901 A JP 2003321901A
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- Prior art keywords
- steel material
- strength
- steel
- low
- composite
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鋼材によって補強
され、構造物の柱、梁、床スラブなどを構成するコンク
リート部材に関するものである。特に、鋼材に緊張力を
導入することによって、この鋼材が定着されるコンクリ
ートに予め圧縮応力を生じさせたプレストレストコンク
リート部材に関するものである。また、このコンクリー
ト部材に用いる複合PC鋼材とその定着具に関するもので
ある。特に、大地震などでも鋼材が破断しにくく、万一
破断しても取り替えが可能なエネルギー吸収能力を有す
る複合PC鋼材と、そのPC鋼材を緊張・定着するのに最適
な定着具に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete member which is reinforced by a steel material and constitutes a pillar, a beam, a floor slab or the like of a structure. In particular, the present invention relates to a prestressed concrete member in which a compressive stress is generated in advance in concrete to which the steel material is fixed by introducing a tension force into the steel material. Further, the present invention relates to a composite PC steel material used for this concrete member and its fixing tool. In particular, it relates to a composite PC steel material that has an energy absorption capacity that can be replaced even if it breaks, even if a large earthquake occurs, and an optimum fixing tool for tensioning and fixing the PC steel material. .
【０００２】[0002]
【従来の技術】大地震などで過大な荷重が作用した場
合、コンクリート構造物の崩壊を抑制するための引張鋼
材として、特開平6-336788号公報に記載の技術がある。
これは、高強度の引張鋼材と、低強度の引張鋼材とを複
合した引張鋼材を開示している。この構成により、高強
度の引張鋼材により高い降伏点強度を実現し、低強度引
張鋼材が変形することで地震などの外部エネルギーの一
部を消費して構造物の崩壊を防止している。2. Description of the Related Art As a tensile steel material for suppressing collapse of a concrete structure when an excessive load is applied due to a large earthquake or the like, there is a technology described in JP-A-6-336788.
This discloses a tensile steel material that is a composite of a high strength tensile steel material and a low strength tensile steel material. With this structure, a high yield strength is realized by the high-strength tensile steel material, and the deformation of the low-strength tensile steel material consumes a part of external energy such as an earthquake to prevent the structure from collapsing.
【０００３】また、同様の目的を達するためのプレスト
レストコンクリート部材として、特開平7-133647号公報
に記載の技術がある。これは、降伏点を超えて引張力が
導入された第１の鋼材と、ほぼ弾性変形を生じる範囲内
の引張応力度が導入された第２の鋼材とを、ほぼ同方向
に埋設したプレストレストコンクリート部材を開示して
いる。Further, as a prestressed concrete member for achieving the same purpose, there is a technique described in JP-A-7-133647. This is a prestressed concrete in which a first steel material in which a tensile force is introduced beyond the yield point and a second steel material in which a tensile stress degree within a range in which substantially elastic deformation is introduced are embedded in substantially the same direction. A member is disclosed.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記の従来技
術には次のような問題があった。
大地震などの場合、引張鋼材が破断する可能性があ
る。柱と梁を有する構造物において、引張鋼材は柱や梁
に付着している。このような構造物に大地震に伴う応力
が作用した場合、柱や梁のつなぎ目（目地部）のような
応力の集中する部位には開きやひび割れなどが生じるこ
とがある。その場合、目地部やひび割れ部等の引張鋼材
に変形が集中し、地震力が大きい場合に引張鋼材が破断
することがある。However, the above-mentioned prior art has the following problems. In the event of a major earthquake, the tensile steel may break. In a structure having columns and beams, the tensile steel material is attached to the columns and beams. When a stress caused by a large earthquake acts on such a structure, openings or cracks may occur in a portion where stress is concentrated, such as a joint (joint portion) of a column or a beam. In that case, the deformation concentrates on the tensile steel material such as joints and cracks, and the tensile steel material may break when the seismic force is large.
【０００５】引張鋼材がダメージを受けた場合、その
取り替えを行うことができない。通常、高強度の引張鋼
材と低強度の引張鋼材が撚り合わされている上、これら
はコンクリートと付着しているため、取り替えなどの補
修を行うことができない。If the tensile steel material is damaged, it cannot be replaced. Usually, a high-strength tensile steel material and a low-strength tensile steel material are twisted together, and since these are attached to concrete, repairs such as replacement cannot be performed.
【０００６】アンボンド工法の利用ができない。特開
平6-336788号公報や特開平7-133647号公報に記載の複合
鋼材の表面にグリースなどの防錆剤塗布後、シースで被
覆したアンボンド鋼材とした場合、低強度鋼材はコンク
リートとの付着がないので構造物の目地部の変形による
低強度鋼材の歪みは大きくならない。従って、複合鋼材
によるエネルギー吸収が十分でない。そのため、引張鋼
材自体がコンクリートに付着する構造とする必要があ
り、シースの配置、シースへのPC鋼材の挿入、PC鋼材緊
張後のグラウト注入などの作業が必要となる。その結
果、アンボンド工法のように、シース配置、グラウト注
入作業を省略することができず、施工コストを低減でき
ない。Unbonded construction method cannot be used. When an unbonded steel material coated with a sheath after applying an anticorrosive agent such as grease to the surface of the composite steel material described in JP-A-6-336788 or JP-A-7-133647, the low-strength steel material adheres to concrete. Since it does not exist, the distortion of the low strength steel material due to the deformation of the joint of the structure does not become large. Therefore, the energy absorption by the composite steel material is not sufficient. Therefore, it is necessary to have a structure in which the tensile steel material itself adheres to the concrete, and work such as arranging the sheath, inserting the PC steel material into the sheath, and injecting grout after tensioning the PC steel material is required. As a result, unlike the unbonded construction method, the sheath arrangement and the grout injection work cannot be omitted, and the construction cost cannot be reduced.
【０００７】従って、本発明の主目的は、地震などの過
大な応力に対してエネルギー吸収を行って、構造物の崩
壊と共に引張鋼材の破断を抑制できるプレストレストコ
ンクリート部材およびそれに用いる複合PC鋼材を提供す
ることにある。Therefore, the main object of the present invention is to provide a prestressed concrete member capable of absorbing energy against an excessive stress such as an earthquake and suppressing the fracture of a tensile steel material together with the collapse of a structure, and a composite PC steel material used therefor. To do.
【０００８】また、本発明の他の目的は、上記複合PC鋼
材の定着に好適な定着具を提供することにある。Another object of the present invention is to provide a fixing tool suitable for fixing the composite PC steel material.
【０００９】[0009]
【課題を解決するための手段】本発明は、アンボンドPC
鋼材に低強度の鋼材を複合することで上記の目的を達成
する。The present invention is an unbonded PC.
The above object is achieved by combining a steel material with a low-strength steel material.
【００１０】すなわち、本発明複合PC鋼材は、PC鋼材の
外周をシースで覆ったアンボンドPC鋼材と、前記PC鋼材
よりも低強度で、前記アンボンドPC鋼材の外周に撚り合
わされた低強度鋼材とを具えることを特徴とする。前記
PC鋼材はPC鋼棒であっても、PC鋼より線であってもよ
い。That is, the composite PC steel material of the present invention comprises an unbonded PC steel material in which the outer circumference of the PC steel material is covered with a sheath, and a low-strength steel material having a lower strength than the PC steel material and twisted around the outer circumference of the unbonded PC steel material. It is characterized by having. The above
The PC steel material may be a PC steel rod or a PC steel strand.
【００１１】アンボンドPC鋼材を用いることで、PC鋼材
とコンクリートとは付着がない。従って、地震などに伴
う構造物の変形は、目地部分やひび割れ発生部分にある
PC鋼材に集中せず、アンボンドPC鋼材全長に分散される
ので、PC鋼材が破断する可能性を減少できる。また、シ
ースの配置、鋼材の挿入、グラウトの注入作業が不要と
なり、コスト低減が可能である。一方で、アンボンドPC
鋼材の周囲に配置された低強度鋼材が塑性変形するの
で、地震などの外部エネルギーの一部を吸収して構造物
の崩壊を防止する。By using the unbonded PC steel material, the PC steel material and the concrete do not adhere to each other. Therefore, the deformation of the structure due to an earthquake is in the joints and cracks.
Since it is not concentrated on PC steel and is dispersed over the entire length of unbonded PC steel, the possibility of PC steel breaking can be reduced. Further, the arrangement of the sheath, the insertion of the steel material, and the grout injection work become unnecessary, and the cost can be reduced. On the other hand, unbonded PC
Since the low-strength steel material arranged around the steel material undergoes plastic deformation, it absorbs a part of external energy such as an earthquake to prevent the structure from collapsing.
【００１２】さらに、アンボンドPC鋼材を用いること
で、万一PC鋼材の降伏点を超える荷重が作用してPC鋼材
が損傷した場合、PC鋼材を引き抜いて差し替えることが
できる。Further, by using the unbonded PC steel material, if the PC steel material is damaged due to a load exceeding the yield point of the PC steel material, the PC steel material can be pulled out and replaced.
【００１３】前記低強度鋼材の径は、前記PC鋼材の径よ
りも小さいことが好ましい。これにより、曲げて束ねる
などの取扱い性が向上するので、運搬や現場での配置な
どの施工性を向上させることができる。The diameter of the low-strength steel material is preferably smaller than the diameter of the PC steel material. As a result, handling such as bending and bundling is improved, so that workability such as transportation and on-site placement can be improved.
【００１４】また、プレストレストコンクリート部材の
製作は、特開平7-133647号公報記載の技術ではプレキャ
スト工法のみが可能であった。しかし、本発明では、PC
鋼材はコンクリートとの付着がないので、コンクリート
打設後でも緊張可能なため、プレキャスト工法の他にハ
ーフプレキャスト工法、場所打ちコンクリート工法での
利用が可能である。The prestressed concrete member can be manufactured only by the precast method according to the technique disclosed in Japanese Patent Laid-Open No. 7-133647. However, in the present invention, the PC
Since steel does not adhere to concrete, it can be tensioned even after concrete is placed, so it can be used not only in the precast method but also in the half precast method and cast-in-place concrete method.
【００１５】前記低強度鋼材の本数は、12本以上とする
ことが好ましい。この構成本数の範囲であれば、外周の
低強度鋼材の素線を人手で折り曲げ可能で、かつ撚りを
解いてアンボンドPC鋼材のシースを除去する作業が容易
に可能な素線直径とできる。また、初期付着力に必要な
鋼材の表面積を確保し、かつ撚ることで軸方向に対し角
度を持つ撚り溝を形成できるので、低強度鋼材とコンク
リートとの必要な付着力が得られる。低強度鋼材素線径
5.7mmの複合PC鋼材における付着応力度は、5.7N／mm2で
あった。複合PC鋼材の周長は「(2／3)×π×素線径×素
線本数」で算出する。The number of the low-strength steel materials is preferably 12 or more. If the number of constituent wires is within this range, it is possible to manually bend the low-strength steel wire on the outer periphery and to easily untwist and remove the sheath of the unbonded PC steel material so that the wire diameter can be made easily. Further, since the surface area of the steel material required for the initial adhesive force is secured and the twist groove having an angle with respect to the axial direction can be formed by twisting, the necessary adhesive force between the low-strength steel material and the concrete can be obtained. Low strength steel strand diameter
The degree of adhesion stress in the 5.7 mm composite PC steel material was 5.7 N / mm 2 . The perimeter of composite PC steel is calculated by "(2/3) x π x strand diameter x number of strands".
【００１６】さらに、後述の定着具にて3枚一組のオス
コーンを用い、このオスコーンとメスコーンとの間で押
さえる低強度鋼材の素線本数が12本以上であれば、素線
同士の間隔の偏りがあっても、1枚のオスコーンとメス
コーンの間に3本以上の素線を挟むので安定して定着で
きる。Further, if a set of three male cones is used in the fixing device described later and the number of strands of the low-strength steel material held between the male cone and the female cone is 12 or more, the spacing between the strands is Even if there is a bias, three or more strands are sandwiched between one male cone and one female cone, so stable fixation is possible.
【００１７】前記の複合PC鋼材では、アンボンドPC鋼材
におけるPC鋼材を緊張・定着し、低強度鋼材の定着を同
時に行う必要がある。オスコーンによりPC鋼材を把持
し、オスコーンの外周に低強度鋼材を配置する。そし
て、低強度鋼材の外側にメスコーンを配置することで、
低強度鋼材の定着も一度に行うことができる。In the composite PC steel material described above, it is necessary to tension and fix the PC steel material in the unbonded PC steel material and simultaneously fix the low strength steel material. The PC steel is gripped by the male cone, and the low-strength steel is placed around the male cone. And by arranging the female cone outside the low strength steel,
It is also possible to fix low-strength steel materials at once.
【００１８】さらに、本発明プレストレストコンクリー
ト部材は、複合PC鋼材が配置されているプレストレスト
コンクリート部材であって、この複合PC鋼材は、降伏歪
みを超えないように引張力を導入したPC鋼材と、前記PC
鋼材よりも低強度の低強度鋼材とを有し、前記PC鋼材と
低強度鋼材とは、PC鋼材の歪みの増減が低強度鋼材に連
動しないように一体化されていることを特徴とする。Further, the prestressed concrete member of the present invention is a prestressed concrete member in which a composite PC steel material is arranged, and the composite PC steel material is a PC steel material in which a tensile force is introduced so as not to exceed the yield strain, PC
A low-strength steel material having a strength lower than that of the steel material, and the PC steel material and the low-strength steel material are integrated so that the increase or decrease in strain of the PC steel material does not interlock with the low-strength steel material.
【００１９】このコンクリート部材によれば、PC鋼材の
歪みの増減が低強度鋼材に連動しないため、地震などに
伴う構造物の変形によるPC鋼材の荷重変化は目地部分に
集中せず、引張力を導入したPC鋼材全長に分散される。
また、地震時などは、コンクリートと付着された低強度
鋼材が塑性変形するので、地震などの外部エネルギーの
一部を吸収して構造物の崩壊を防止する。According to this concrete member, since the increase / decrease in strain of the PC steel material does not interlock with the low-strength steel material, the load change of the PC steel material due to the deformation of the structure due to an earthquake does not concentrate on the joint portion, and the tensile force is Dispersed over the entire length of the introduced PC steel.
Further, during an earthquake or the like, since the low-strength steel material adhered to the concrete plastically deforms, a part of external energy such as an earthquake is absorbed to prevent the structure from collapsing.
【００２０】このようなプレストレストコンクリート部
材は、複合PC鋼材を前述の定着具で定着することが好適
である。すなわち、この定着具は、アンボンドPC鋼材に
おけるPC鋼材を把持するオスコーンと、このオスコーン
の外周との間に前記低強度鋼材を挟み込むメスコーンと
を具えることを特徴とする。この定着具を用いれば、PC
鋼材の緊張・定着と低強度鋼材の定着を同時に行うこと
ができる。In such a prestressed concrete member, it is preferable to fix the composite PC steel material with the above-mentioned fixing tool. That is, this fixing tool is characterized by including a male cone that holds the PC steel material in the unbonded PC steel material, and a female cone that sandwiches the low-strength steel material between the male cone and the outer periphery of the male cone. With this fixing tool, PC
Tension and fixation of steel materials and fixation of low strength steel materials can be performed at the same time.
【００２１】[0021]
【発明の実施の形態】以下、本発明の実施の形態を説明
する。図１は本発明複合PC鋼材の概略断面図である。こ
の複合PC鋼材は、アンボンドPC鋼より線10と、その外周
に撚り合わされる低強度鋼材20とからなる。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. FIG. 1 is a schematic sectional view of the composite PC steel material of the present invention. This composite PC steel material is composed of an unbonded PC stranded wire 10 and a low-strength steel material 20 that is twisted around the outer periphery thereof.
【００２２】アンボンドPC鋼より線10（図では単に円で
示している）は、PC鋼より線の外周をシースで覆ったも
のである。通常、PC鋼より線とシースとの間には、グリ
ースなどの充填剤が注入されている。ここでは、7本の
素線を撚り合わせた12.7mmφのPC鋼より線（降伏応力度
1860N/mm２）の外周をポリエチレンのシースで覆った。
シースの外径は16.2mmである。The unbonded PC stranded wire 10 (simply indicated by a circle in the figure) is obtained by covering the outer circumference of the PC stranded wire with a sheath. Usually, a filler such as grease is injected between the PC stranded wire and the sheath. Here, 12.7 mmφ PC steel twisted wire (yield stress
The outer circumference of 1860 N / mm 2 ) was covered with a polyethylene sheath.
The outer diameter of the sheath is 16.2 mm.
【００２３】このようなアンボンドPC鋼より線10の外周
に低強度鋼材20を撚り合わせる。ここでは、5.7mmφの
普通鉄筋（降伏応力度560N/mm２）を12本撚り合わせ
た。もちろん、PC鋼より線の線径や低強度鋼材の線径・
本数がこれに限定されるわけではない。表１に、本発明
で用いられるPC鋼より線の線径や低強度鋼材（外周素
線）の径や本数の組合せの例を示す。これは現存するPC
鋼より線機を用いて製造可能な例である。A low-strength steel material 20 is twisted around the outer periphery of such an unbonded PC stranded wire 10. Here, 12 5.7 mmφ ordinary reinforcing bars (yield stress degree 560 N / mm 2 ) were twisted together. Of course, the wire diameter of PC steel strands and the wire diameter of low strength steel materials
The number is not limited to this. Table 1 shows examples of combinations of the diameter of the PC stranded wire used in the present invention, the diameter of the low-strength steel material (peripheral strand), and the number thereof. This is an existing PC
It is an example that can be manufactured using a steel stranding machine.
【００２４】[0024]
【表１】 [Table 1]
【００２５】アンボンドPC鋼より線を用いることで、PC
鋼より線とコンクリートとの付着をなくすことができ、
地震時などの過大な荷重が作用した場合でも、PC鋼より
線の全長にわたって均一に荷重を分散させることができ
るので、PC鋼より線が破断する可能性を回避できる。ま
た、PC鋼より線はコンクリートとの付着がないため、ポ
ストテンション工法に用いることができる。また、地震
などでPC鋼より線が降伏点を超えるダメージを受けた場
合、PC鋼より線を差し替えることもできる。そして、PC
鋼より線で高い降伏点を有すると共に、低強度鋼材によ
り、地震の外部エネルギーを消費して構造物の崩壊を防
止する。[0025] By using unbonded PC stranded wire, PC
It is possible to eliminate the adhesion between steel stranded wire and concrete,
Even if an excessive load such as an earthquake is applied, the load can be evenly distributed over the entire length of the PC steel wire, and thus the possibility of the PC steel wire breaking can be avoided. Moreover, since PC steel stranded wire does not adhere to concrete, it can be used for the post-tension construction method. In addition, if the PC strands are damaged beyond the yield point due to an earthquake, etc., the PC strands can be replaced. And pc
It has a high yield point in the steel strand and the low strength steel consumes the external energy of the earthquake to prevent the collapse of the structure.
【００２６】この地震エネルギーを消費するメカニズム
を図2のグラフに基づいて説明する。このグラフは、コ
ンクリート構造物内でのPC鋼より線と低強度鋼材の荷重
‐歪の関係を示している。図中、TpはPC鋼より線の緊張
後の状態を示す点で、このときの低強度鋼材は緊張され
ていないので、0点に位置する。地震時、PC鋼より線はT
pE点まで歪が上昇するが、変形量はPC鋼より線がコンク
リートに付着していないのでPC鋼より線全長に分散さ
れ、大きな歪とならない。一方、低強度鋼材は、Tsy点
を経由してTsE点まで歪量が上昇するが、地震後、TsE′
点に移動するので、0、Tsy、TsE、TsE′で囲まれる面積
に相当するエネルギーが消費されることになる。The mechanism of consuming the seismic energy will be described based on the graph of FIG. This graph shows the load-strain relationship between PC strand and low strength steel in a concrete structure. In the figure, Tp is a point indicating a state after tension of the PC steel wire, and the low-strength steel material at this time is not tensioned, so it is located at the 0 point. In the event of an earthquake, PC steel strands are T
Although the strain increases up to the pE point, the amount of deformation is dispersed over the entire length of the PC steel wire because the PC steel wire does not adhere to the concrete, and the strain does not become large. On the other hand, in low-strength steel, the amount of strain increases to the TsE point via the Tsy point, but after the earthquake, TsE ′
Since it moves to a point, energy corresponding to the area surrounded by 0, Tsy, TsE, and TsE 'is consumed.
【００２７】図３に示すように、梁30と柱40を接合した
試験体において、前記複合PC鋼材100を柱40から梁30に
至るように配置し、梁端に正負の繰り返し荷重を載荷
し、荷重と梁端の変位を測定した。せん断力と変位の関
係を図４のグラフに示す。図における実線が本発明複合
PC鋼材で、破線が通常のPC鋼より線の試験結果を示して
いる。As shown in FIG. 3, in a test body in which a beam 30 and a column 40 are joined, the composite PC steel material 100 is arranged from the column 40 to the beam 30, and positive and negative repetitive loads are applied to the beam ends. The load and displacement of the beam end were measured. The relationship between shear force and displacement is shown in the graph of FIG. The solid line in the figure is the composite of the present invention.
For PC steel, the broken line shows the test results of ordinary PC stranded wire.
【００２８】このグラフから最外縁包絡線を見ると、複
合PC鋼材は明らかに通常のPC鋼より線の包絡線面積より
も広い包絡線面積を有しており、エネルギー消費能力が
大きいことがわかる。When the outermost edge envelope is seen from this graph, it is clear that the composite PC steel material has a larger envelope area than the ordinary PC steel wire and has a large energy consumption capacity. .
【００２９】次に、本発明定着具を説明する。図５は本
発明定着具の定着状態を示す模式断面図である。Next, the fixing device of the present invention will be described. FIG. 5 is a schematic sectional view showing a fixing state of the fixing device of the present invention.
【００３０】ここで定着される複合PC鋼材は前述したア
ンボンドPC鋼より線10と、低強度鋼線20とから構成され
ている。すなわち、アンボンドPC鋼より線10は、PC鋼よ
り線11の外周をシース12で覆ったものである。The composite PC steel material fixed here is composed of the unbonded PC steel stranded wire 10 and the low-strength steel wire 20 described above. That is, the unbonded PC steel stranded wire 10 is obtained by covering the outer circumference of the PC steel stranded wire 11 with the sheath 12.
【００３１】定着具は、PC鋼より線を把持するオスコー
ン50と、オスコーン50が挿入されるメスコーン60とを具
える。オスコーン50は、一端の径が太く、他端の径が細
いテーパー状の円筒で、通常、複数の分割片を組み合わ
せることで、テーパー状の円筒が形成されている。オス
コーン50の内周には、PC鋼より線11との摩擦を高める雌
ねじ51が形成されている。The fixing device comprises a male cone 50 for holding a PC strand and a female cone 60 into which the male cone 50 is inserted. The male cone 50 is a tapered cylinder having a large diameter at one end and a small diameter at the other end. Usually, a tapered cylinder is formed by combining a plurality of divided pieces. A female screw 51 is formed on the inner circumference of the male cone 50 to enhance friction with the PC steel strand 11.
【００３２】一方、メスコーン60は、前記オスコーン50
よりも大きなテーパー孔が形成された円盤状のものであ
る。すなわち、メスコーンの外周に低強度鋼材を配置し
たものがはめ込まれるようなテーパー孔61が形成されて
いる。On the other hand, the female cone 60 is the male cone 50.
It has a disk shape with a larger tapered hole. That is, the tapered hole 61 is formed so that the one in which the low-strength steel material is arranged can be fitted to the outer periphery of the female cone.
【００３３】定着を行う場合、複合PC鋼材100配置後に
打設し硬化したコンクリート又はグラウト75の端面に支
圧プレート70を配置する。その際、シース12の端部は予
め除去しておくが、支圧プレートから突出しなければよ
い。In the case of fixing, the bearing plate 70 is placed on the end surface of the concrete or grout 75 which has been cast and hardened after the composite PC steel material 100 is placed. At this time, the end of the sheath 12 is removed in advance, but it does not have to protrude from the pressure bearing plate.
【００３４】続いて、支圧プレート70から突出した複合
PC鋼材100の外側にメスコーン60を配置する。複合PC鋼
材100のうち低強度鋼材20を外周側に押し広げ、PC鋼よ
り線10と低強度鋼材20との間にオスコーン50を配置す
る。このとき、低強度鋼材20はPC鋼より線10から放射状
に広がるので、オスコーン50よりも外側にある低強度鋼
材を切断するとより作業が容易になる。Subsequently, the composite projecting from the bearing plate 70
A female cone 60 is arranged outside the PC steel material 100. A low-strength steel material 20 of the composite PC steel material 100 is spread outward and a male cone 50 is arranged between the PC steel strand 10 and the low-strength steel material 20. At this time, since the low-strength steel material 20 spreads radially from the PC steel strand 10, the work becomes easier by cutting the low-strength steel material outside the male cone 50.
【００３５】そして、メスコーン60にジャッキアタッチ
メント80を配置し、オスコーン50の端部に延長ラム85を
配置して、ジャッキ90でPC鋼より線10を緊張し、オスコ
ーン50をPC鋼より線11と低強度鋼材20との間に圧入す
る。Then, the jack attachment 80 is arranged on the female cone 60, the extension ram 85 is arranged at the end of the male cone 50, and the PC steel strand 10 is tensioned by the jack 90, and the male cone 50 is connected to the PC steel strand 11. It is press-fitted into the low-strength steel material 20.
【００３６】このような構成の定着具により、PC鋼より
線は緊張定着することができ、同時に外周の低強度鋼材
も定着することができる。With the fixing device having such a structure, the PC steel strand can be tension-fixed, and at the same time, the low-strength steel material on the outer periphery can also be fixed.
【００３７】[0037]
【発明の効果】以上説明したように、本発明複合PC鋼材
によれば、アンボンドのPC鋼材を用いることで、PC鋼材
がコンクリートに付着しない状態にできるので、地震な
どにPC鋼材に発生するひずみをPC鋼材全長に分散でき、
大きなひずみを生じにくくできる。As described above, according to the composite PC steel material of the present invention, by using the unbonded PC steel material, it is possible to prevent the PC steel material from adhering to the concrete. Can be dispersed over the entire length of PC steel,
It is possible to prevent large strain from occurring.
【００３８】また、アンボンドPC鋼材の外周に低強度鋼
材をより合せているので、構造物への地震エネルギーを
低強度鋼材が変形することでエネルギーが吸収され、構
造物の崩壊を防止できる。Further, since the low-strength steel material is twisted around the outer periphery of the unbonded PC steel material, the seismic energy to the structure is absorbed by the deformation of the low-strength steel material, and the collapse of the structure can be prevented.
【００３９】さらに、アンボンドPC鋼材を用いること
で、万一PC鋼材の降伏点を越える荷重が作用してPC鋼材
が損傷した場合でも、PC鋼材を引き抜いて差し替えるこ
とができる。Further, by using the unbonded PC steel material, even if the PC steel material is damaged by a load exceeding the yield point of the PC steel material, the PC steel material can be pulled out and replaced.
【図１】本発明複合PC鋼材の概略断面図である。FIG. 1 is a schematic sectional view of a composite PC steel material of the present invention.
【図２】本発明複合PC鋼材の荷重−歪関係を示すグラフ
である。FIG. 2 is a graph showing a load-strain relationship of the composite PC steel material of the present invention.
【図３】梁と柱からなる試験体および場所打ち工法の実
施例の説明図である。FIG. 3 is an explanatory diagram of an embodiment of a test body including beams and columns and a cast-in-place method.
【図４】せん断力と変位の関係を示すグラフである。FIG. 4 is a graph showing the relationship between shear force and displacement.
【図５】本発明定着具の定着状態を示す説明図である。FIG. 5 is an explanatory view showing a fixing state of the fixing device of the present invention.
10 アンボンドPC鋼より線 11 PC鋼より線 12 シース 20 低強度鋼材 30 梁 40 柱 50 オスコーン 51 雌ねじ 60 メスコーン 61 テーパー孔 70 支圧プレート 75 コンクリート 80 ジャッキアタッチメント 85 延長圧入ラム 90 ジャッキ 100 複合PC鋼材 10 Unbonded PC steel stranded wire 11 PC steel stranded wire 12 sheath 20 Low strength steel 30 beams 40 pillars 50 male corn 51 female screw 60 corn 61 Taper hole 70 bearing plate 75 concrete 80 jack attachment 85 Extension press-fitting ram 90 jack 100 composite PC steel
───────────────────────────────────────────────────── フロントページの続き (72)発明者 荒金 勝 兵庫県伊丹市昆陽北一丁目１番１号 住友 電気工業株式会社伊丹製作所内 (72)発明者 三上 泰治 東京都港区元赤坂一丁目３番12号 住友電 気工業株式会社東京本社内 (72)発明者 仁木 敏彦 兵庫県伊丹市昆陽北一丁目１番１号 住友 電気工業株式会社伊丹製作所内 Ｆターム(参考） 2E164 AA02 AA31 DA01 DA12 DA23 DA24 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Arakane Masaru Sumitomo, 1-1 1-1 Koyokita, Itami City, Hyogo Prefecture Electric Industry Co., Ltd. Itami Works (72) Inventor Taiji Mikami Sumitomo Electric Co., Ltd. 1-3-12 Moto-Akasaka, Minato-ku, Tokyo Ki Industry Co., Ltd. Tokyo head office (72) Inventor Toshihiko Niki Sumitomo, 1-1 1-1 Koyokita, Itami City, Hyogo Prefecture Electric Industry Co., Ltd. Itami Works F-term (reference) 2E164 AA02 AA31 DA01 DA12 DA23 DA24
Claims (5)
ドPC鋼材と、 前記PC鋼材よりも低強度で、前記アンボンドPC鋼材の外
周に撚り合わせた低強度鋼材とを具えることを特徴とす
る複合PC鋼材。1. An unbonded PC steel material in which the outer circumference of a PC steel material is covered with a sheath, and a low-strength steel material having a lower strength than the PC steel material and twisted around the outer circumference of the unbonded PC steel material. Composite PC steel.
ることを特徴とする請求項１に記載の複合PC鋼材。2. The composite PC steel material according to claim 1, wherein the number of the low-strength steel materials is 12 or more.
ドPC鋼材と、前記PC鋼材よりも低強度で、前記アンボン
ドPC鋼材の外周に撚り合わせた低強度鋼材とを具える複
合PC鋼材を定着する定着具であって、 前記PC鋼材を把持するオスコーンと、 前記オスコーンの外周との間に前記低強度鋼材を挟み込
むメスコーンとを具えることを特徴とする複合PC鋼材の
定着具。3. A composite PC steel material comprising an unbonded PC steel material in which the outer circumference of the PC steel material is covered with a sheath, and a low-strength steel material having lower strength than the PC steel material and twisted around the outer circumference of the unbonded PC steel material. A fixing tool for composite PC steel material, comprising: a male cone that holds the PC steel material; and a female cone that sandwiches the low-strength steel material between the outer periphery of the male cone.
ストコンクリート部材であって、 前記複合PC鋼材は、降伏歪みを超えないように引張力を
導入したPC鋼材と、前記PC鋼材よりも低強度の低強度鋼
材とを有し、 前記PC鋼材と低強度鋼材とは、PC鋼材の歪みの増減が低
強度鋼材に連動しないように一体化されていることを特
徴とするプレストレストコンクリート部材。4. A prestressed concrete member in which a composite PC steel material is embedded, wherein the composite PC steel material has a tensile strength introduced so as not to exceed the yield strain, and a strength lower than that of the PC steel material. A prestressed concrete member comprising a low-strength steel material, wherein the PC steel material and the low-strength steel material are integrated so that the increase or decrease in strain of the PC steel material does not interlock with the low-strength steel material.
え、 この定着具は、前記PC鋼材を把持するオスコーンと、前
記オスコーンの外周との間に前記低強度鋼材を挟み込む
メスコーンとを具えることを特徴とする請求項４に記載
のプレストレストコンクリート部材。5. A fixing tool for fixing the composite PC steel material is provided, and the fixing tool includes a male cone for holding the PC steel material and a female cone for sandwiching the low strength steel material between the outer periphery of the male cone. The prestressed concrete member according to claim 4, wherein
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|---|---|---|---|
| JP2002128198A JP3897637B2 (en) | 2002-04-30 | 2002-04-30 | Composite PC steel and its fixing tool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002128198A JP3897637B2 (en) | 2002-04-30 | 2002-04-30 | Composite PC steel and its fixing tool |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111663714A (en) * | 2020-06-23 | 2020-09-15 | 广东海洋大学 | Novel intelligent FRP bendable composite steel |
| CN111663714B (en) * | 2020-06-23 | 2024-05-24 | 广东海洋大学 | Novel intelligent FRP bendable composite steel |
-
2002
- 2002-04-30 JP JP2002128198A patent/JP3897637B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111663714A (en) * | 2020-06-23 | 2020-09-15 | 广东海洋大学 | Novel intelligent FRP bendable composite steel |
| CN111663714B (en) * | 2020-06-23 | 2024-05-24 | 广东海洋大学 | Novel intelligent FRP bendable composite steel |
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| Publication number | Publication date |
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