JP2009167653A - Prestressing bar tensioner - Google Patents

Prestressing bar tensioner Download PDF

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JP2009167653A
JP2009167653A JP2008005540A JP2008005540A JP2009167653A JP 2009167653 A JP2009167653 A JP 2009167653A JP 2008005540 A JP2008005540 A JP 2008005540A JP 2008005540 A JP2008005540 A JP 2008005540A JP 2009167653 A JP2009167653 A JP 2009167653A
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support
intermediate member
steel bar
concrete structure
parallel link
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Isamu Take
偉 岳
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Daiwa House Industry Co Ltd
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Daiwa House Industry Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a prestressing bar tension unit which is simple in structure, light in weight, and facilitates handling thereof even by a single operator. <P>SOLUTION: The prestressing bar tensioner is pressed to an end face of a concrete structure 30 from which a prestressing bar 31 is protruded; a second support body 3 which is detachably attached to a protrusion of the prestressing bar 31; a parallel link mechanism 4 which is connected to the support bodies to change an interval between both the support bodies; and an operating mechanism 5 for changing a link angle. The parallel link mechanism 4 has first and second intermediate members 6, 7 which are located between both the support bodies 2, 3, and link members 8 to 11 which are rotatably connected to the support bodies 2, 3 and the intermediate members 6, 7. The operating member 5 has an intermediate connection member 12 connecting between both the intermediate members 6, 7 of the parallel link mechanism 4 together, and a screw coupling portion 13 for changing a connection portion between the intermediate connection member and each of the intermediate members 6, 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、コンクリート構造物の端面から突出するＰＣ鋼棒に対して所定の張力を与えるＰＣ鋼棒の緊張装置に関する。   The present invention relates to a tensioning device for a PC steel bar that applies a predetermined tension to a PC steel bar protruding from an end face of a concrete structure.

コンクリート構造物の端面から突出するＰＣ鋼棒に所定の張力を付与するのに、従来は油圧ジャッキを用いるのが一般的である（例えば特許文献１）。
特開２００２−２１３０８３号公報 特開平８−３１９７２０号公報 Conventionally, a hydraulic jack is generally used to apply a predetermined tension to the PC steel bar protruding from the end face of the concrete structure (for example, Patent Document 1).
JP 2002-213083 A JP-A-8-319720

しかし、油圧ジャッキを用いてＰＣ鋼棒に張力を与えるのでは、取り扱う装置が重く、操作も複雑になり、一人の作業者では簡単に操作できないという問題がある。   However, if tension is applied to the PC steel bar using a hydraulic jack, there is a problem that the apparatus to be handled is heavy and the operation becomes complicated, and it cannot be easily operated by one worker.

この発明の目的は、構成が簡単かつ軽量で、一人の作業者により容易に操作できるＰＣ鋼棒の緊張装置を提供することである。   An object of the present invention is to provide a tensioning device for a PC steel rod that is simple and lightweight and can be easily operated by one operator.

この発明のＰＣ鋼棒の緊張装置は、コンクリート構造物の端面から突出するＰＣ鋼棒に対して張力を与えるＰＣ鋼棒の緊張装置であって、前記ＰＣ鋼棒が突出する前記コンクリート構造物の端面に押し当てられる第１の支持体と、前記ＰＣ鋼棒の突出部に着脱可能に取付けられる第２の支持体と、前記第１の支持体および第２の支持体に連結されてこれら第１の支持体と第２の支持体との間隔を変更する平行リンク機構と、この平行リンク機構のリンク角度を変更する操作機構とを備え、前記平行リンク機構は、前記第１の支持体と第２の支持体の間に位置する第１および第２の中間部材と、前記第１の支持体と第１の中間部材の間、第１の支持体と第２の中間部材の間、前記第２の支持体と第１の中間部材の間、および第２の支持体と第２の中間部材との間にそれぞれ回動自在に連結された第１ないし第４のリンク部材とを有し、前記操作部材は、前記平行リンク機構の前記第１の中間部材と第２の中間部材とを連結した中間連結部材と、互いに螺合した雄ねじ部および雌ねじ部を有しこれら雄ねじ部と雌ねじ部の相対回転により前記中間連結部材の第１または第２の中間部材との連結部位を変えるねじ結合部とを有する。
この構成によると、操作機構のねじ結合部の雄ねじ部と雌ねじ部を相対回転させることで、平行リンク機構のリンク角度を小さくして行くと、第１の支持体と第２の支持体との間隔が広がり、ＰＣ鋼棒が引っ張られて伸び所定の張力が与えられる。このように、平行リンク機構と、回転を直線動作に変換するねじ結合部を有する操作機構とを備えるため、油圧ジャッキ等のような油圧源等が不要であり、構成が簡単でかつ軽量で、一人の作業者により容易に操作することができる。 A tensioning device for a PC steel bar according to the present invention is a tensioning device for a PC steel bar that applies tension to the PC steel bar projecting from an end surface of the concrete structure, and the tensioning device for the concrete structure from which the PC steel rod projects. A first support pressed against the end face, a second support detachably attached to the protruding portion of the PC steel rod, and the first support and the second support connected to the first support and the second support. A parallel link mechanism that changes a distance between the first support body and the second support body, and an operation mechanism that changes a link angle of the parallel link mechanism, and the parallel link mechanism includes the first support body and the first support body. The first and second intermediate members located between the second support, the first support and the first intermediate member, the first support and the second intermediate member, Between the second support and the first intermediate member and between the second support and the second First to fourth link members rotatably connected to the intermediate member, and the operating member includes the first intermediate member and the second intermediate member of the parallel link mechanism. An intermediate connecting member connected to each other, and a male screw part and a female screw part screwed to each other, and a screw that changes a connecting part of the intermediate connecting member with the first or second intermediate member by relative rotation of the male screw part and the female screw part And a coupling portion.
According to this configuration, when the link angle of the parallel link mechanism is reduced by relatively rotating the male screw portion and the female screw portion of the screw coupling portion of the operation mechanism, the first support body and the second support body The interval is widened, the PC steel bar is pulled and stretched to give a predetermined tension. As described above, since the parallel link mechanism and the operation mechanism having the screw coupling portion for converting the rotation into the linear motion are provided, a hydraulic power source such as a hydraulic jack is unnecessary, the configuration is simple and lightweight, It can be easily operated by one worker.

この発明において、前記操作機構の前記中間連結部材は、一端が前記第２の中間部材に固定され、他端が前記第１の中間部材に形成された挿通孔に挿通されて、前記ねじ結合部の前記雄ねじ部とされ、前記雌ねじ部は、前記中間連結部材の前記雄ねじ部における前記第１の中間部材から第２の中間部材と反対側に突出した部分に螺合したナットであっても良い。   In the present invention, one end of the intermediate connecting member of the operation mechanism is fixed to the second intermediate member, and the other end is inserted through an insertion hole formed in the first intermediate member, and the screw coupling portion The male screw portion may be a nut that is screwed into a portion of the male screw portion of the intermediate connecting member that protrudes from the first intermediate member to the opposite side of the second intermediate member. .

この発明において、前記ＰＣ鋼棒の前記コンクリート構造物の端面からの突出部が雄ねじ部とされ、この雄ねじ部に、前記コンクリート構造物の端面を押し付けるナットが設けられ、前記第１の支持体は、前記ＰＣ鋼棒が挿通される挿通孔を有し前記平行リンク機構が連結されるリンク連結体部と、このリンク連結体部から延びて前記ナットに非接触で跨がり先端が前記コンクリート構造物の端面に当接する脚部とを有するものとしても良い。
この構成の場合、ナットの端面が前記脚部の基端面に当接するまで、緊張装置における操作機構を操作することで、ＰＣ鋼棒へ所定の張力付与を完了させることができるので、操作時のトルク管理が容易となる。 In the present invention, the protruding portion of the PC steel bar from the end surface of the concrete structure is a male screw portion, and the male screw portion is provided with a nut for pressing the end surface of the concrete structure, and the first support is A link connecting body portion having an insertion hole through which the PC steel rod is inserted and to which the parallel link mechanism is connected; and extending from the link connecting body portion without contacting the nut and straddling the tip of the concrete structure It is good also as what has a leg part contact | abutted to this end surface.
In the case of this configuration, by applying the operating mechanism in the tensioning device until the end surface of the nut comes into contact with the base end surface of the leg portion, it is possible to complete the application of a predetermined tension to the PC steel rod. Torque management becomes easy.

この発明のＰＣ鋼棒の緊張装置は、コンクリート構造物の端面から突出するＰＣ鋼棒に対して張力を与えるＰＣ鋼棒の緊張装置であって、前記ＰＣ鋼棒が突出する前記コンクリート構造物の端面に押し当てられる第１の支持体と、前記ＰＣ鋼棒の突出部に着脱可能に取付けられる第２の支持体と、前記第１の支持体および第２の支持体に連結されてこれら第１の支持体と第２の支持体との間隔を変更する平行リンク機構と、この平行リンク機構のリンク角度を変更する操作機構とを備え、前記平行リンク機構は、前記第１の支持体と第２の支持体の間に位置する第１および第２の中間部材と、前記第１の支持体と第１の中間部材の間、第１の支持体と第２の中間部材の間、前記第２の支持体と第１の中間部材の間、および第２の支持体と第２の中間部材との間にそれぞれ回動自在に連結された第１ないし第４のリンク部材とを有し、前記操作部材は、前記平行リンク機構の前記第１の中間部材と第２の中間部材とを連結した中間連結部材と、互いに螺合した雄ねじ部および雌ねじ部を有しこれら雄ねじ部と雌ねじ部の相対回転により前記中間連結部材の第１または第２の中間部材との連結部位を変えるねじ結合部とを有するものとしたため、構成が簡単で、かつ軽量で、一人の作業者により容易に操作できる。   A tensioning device for a PC steel bar according to the present invention is a tensioning device for a PC steel bar that applies tension to the PC steel bar projecting from an end surface of the concrete structure, and the tensioning device for the concrete structure from which the PC steel rod projects. A first support pressed against the end face, a second support detachably attached to the protruding portion of the PC steel rod, and the first support and the second support connected to the first support and the second support. A parallel link mechanism that changes a distance between the first support body and the second support body, and an operation mechanism that changes a link angle of the parallel link mechanism, and the parallel link mechanism includes the first support body and the first support body. The first and second intermediate members located between the second support, the first support and the first intermediate member, the first support and the second intermediate member, Between the second support and the first intermediate member and between the second support and the second First to fourth link members rotatably connected to the intermediate member, and the operating member includes the first intermediate member and the second intermediate member of the parallel link mechanism. An intermediate connecting member connected to each other, and a male screw part and a female screw part screwed to each other, and a screw that changes a connecting part of the intermediate connecting member with the first or second intermediate member by relative rotation of the male screw part and the female screw part Since it has a coupling portion, the structure is simple and lightweight, and it can be easily operated by one operator.

この発明の一実施形態を図１ないし図３と共に説明する。この実施形態のＰＣ鋼棒の緊張装置１は、コンクリート構造物３０の端面から突出するＰＣ鋼棒３１に対して所定の張力を与えるものである。コンクリート構造物３０には、コンクリート打設時にパイプ状の鞘部材３２と、その中に挿入された前記ＰＣ鋼棒３１とが一体に埋設され、このＰＣ鋼棒３１の一端部がコンクリート構造物３０の端面から突出する。ＰＣ鋼棒３１の他端には図示しないアンカー部材が一体に設けられ、コンクリート構造物３０中に埋設されている。   An embodiment of the present invention will be described with reference to FIGS. The tension device 1 for a PC steel bar according to this embodiment applies a predetermined tension to the PC steel bar 31 protruding from the end face of the concrete structure 30. In the concrete structure 30, a pipe-shaped sheath member 32 and the PC steel rod 31 inserted therein are embedded integrally when the concrete is placed, and one end of the PC steel rod 31 is embedded in the concrete structure 30. It protrudes from the end face of. An anchor member (not shown) is integrally provided at the other end of the PC steel bar 31 and is embedded in the concrete structure 30.

前記緊張装置１は、ＰＣ鋼棒３１が突出する前記コンクリート構造物３０の端面に押し当てられる第１の支持体２と、ＰＣ鋼棒３１のコンクリート構造物３０からの突出部３１ａに着脱可能に取付けられる第２の支持体３と、平行リンク機構４と、この平行リンク機構４のリンク角度を変更する操作機構５とを備える。平行リンク機構４は、第１の支持体２および第２の支持体３に連結されて、これら第１の支持体２と第２の支持体３との間隔を変更する機構である。   The tension device 1 is attachable to and detachable from the first support 2 pressed against the end surface of the concrete structure 30 from which the PC steel bar 31 protrudes, and the protrusion 31a of the PC steel bar 31 from the concrete structure 30. A second support 3 to be attached, a parallel link mechanism 4, and an operation mechanism 5 for changing the link angle of the parallel link mechanism 4 are provided. The parallel link mechanism 4 is a mechanism that is connected to the first support 2 and the second support 3 and changes the distance between the first support 2 and the second support 3.

前記平行リンク機構４は、第１の支持体２と第２の支持体３の間に位置する第１および第２の中間部材６，７と、第１の支持体２と第１の中間部材６の間、第１の支持体２と第２の中間部材７の間、第２の支持体３と第１の中間部材６の間、および第２の支持体３と第２の中間部材７との間にそれぞれ回動自在に連結された第１ないし第４のリンク部材８〜１１とを有する。   The parallel link mechanism 4 includes first and second intermediate members 6 and 7 positioned between the first support body 2 and the second support body 3, and the first support body 2 and the first intermediate member. 6, between the first support 2 and the second intermediate member 7, between the second support 3 and the first intermediate member 6, and between the second support 3 and the second intermediate member 7. The first to fourth link members 8 to 11 are rotatably connected to each other.

前記操作部材５は、平行リンク機構４の第１の中間部材６と第２の中間部材７とを連結した中間連結部材１２、およびこの中間連結部材１２の第１の中間部材６との連結部位を変えるねじ結合部１３を有する。中間連結部材１２は、一端が第２の中間部材７に固定され、他端が第１の中間部材６に形成された挿通孔６ａに挿通される雄ねじ部１２ａとされている。この雄ねじ部１２ａにおける第１の中間部材６から第２の中間部材７と反対側に突出した部分に、雌ねじ部となるナット１４が螺合される。このナット１４と、中間連結部材１２の雄ねじ部１２ａとにより、前記操作部材５が構成されている。ナット１４には、その回転操作のための回転レバー１５が設けられている。なお、この操作部材５は、中間連結部材１２の一端が第２の中間部材７に固定される部分で構成しても良い。中間連結部材１２の中間部は、ＰＣ鋼棒３１の突出部３１ａが十分な余裕空間を持って貫通するリング状部１２ｂとされ、これにより中間連結部材１２がＰＣ鋼棒３２の突出部３１ａと干渉しないようにされている。なお、リング状部１２ｂは、ＰＣ鋼棒３１の軸方向に向く円環状であるが、図では見易いように斜めに図示してある。   The operation member 5 includes an intermediate connecting member 12 that connects the first intermediate member 6 and the second intermediate member 7 of the parallel link mechanism 4, and a connecting portion of the intermediate connecting member 12 to the first intermediate member 6. A screw coupling portion 13 for changing the angle. One end of the intermediate connecting member 12 is fixed to the second intermediate member 7, and the other end is a male screw portion 12 a that is inserted into an insertion hole 6 a formed in the first intermediate member 6. A nut 14 serving as a female screw portion is screwed into a portion of the male screw portion 12a that protrudes from the first intermediate member 6 to the opposite side of the second intermediate member 7. The operation member 5 is configured by the nut 14 and the male screw portion 12 a of the intermediate connecting member 12. The nut 14 is provided with a rotation lever 15 for rotating the nut 14. The operation member 5 may be configured by a portion in which one end of the intermediate connecting member 12 is fixed to the second intermediate member 7. The intermediate portion of the intermediate connecting member 12 is a ring-shaped portion 12b through which the protruding portion 31a of the PC steel rod 31 penetrates with a sufficient margin space, whereby the intermediate connecting member 12 and the protruding portion 31a of the PC steel rod 32 It is made not to interfere. In addition, although the ring-shaped part 12b is an annular | circular shape which faces the axial direction of the PC steel bar 31, in the figure, it has illustrated diagonally so that it may be easy to see.

ＰＣ鋼棒３１のコンクリート構造物３０の端面からの突出部３１ａは雄ねじ部とされ、この雄ねじ部に、コンクリート構造物３０の端面を押し付けるナット１６が螺合される。第１の支持体２は、ＰＣ鋼棒３１の突出部３１ａが挿通される挿通孔１７ａを有し前記平行リンク機構４が連結されるリンク連結体部１７と、このリンク連結体部１７から延びて前記ナット１６に非接触で跨がり先端が前記コンクリート構造物３０の端面に当接する断面コ字状の脚部１８とを有する。   The protruding portion 31a of the PC steel bar 31 from the end surface of the concrete structure 30 is a male screw portion, and the nut 16 that presses the end surface of the concrete structure 30 is screwed into the male screw portion. The first support body 2 has an insertion hole 17a through which the protruding portion 31a of the PC steel rod 31 is inserted, and extends from the link connection body portion 17 to which the parallel link mechanism 4 is connected. And a leg portion 18 having a U-shaped cross-section that is in contact with the nut 16 and is in contact with the end surface of the concrete structure 30.

第２の支持体３は、ＰＣ鋼棒３１の突出部３１ａが挿通される挿通孔３ａを有し、雄ねじ部とされたＰＣ鋼棒３１の突出部３１ａの前記第２の支持体３よりも先端側に螺合されるナット１９に当接することで、ＰＣ鋼棒３１の突出部３１ａに着脱可能に取付けられる。   The second support 3 has an insertion hole 3a through which the protrusion 31a of the PC steel rod 31 is inserted, and is more than the second support 3 of the protrusion 31a of the PC steel rod 31 that is a male screw portion. By coming into contact with the nut 19 screwed to the distal end side, it is detachably attached to the protruding portion 31 a of the PC steel bar 31.

図１（Ａ）は前記緊張装置１によりＰＣ鋼棒３１に所定の張力を与える前の状態を、図１（Ｂ）は張力を与えた後の状態をそれぞれ示す。なお、図１（Ｂ）では、ＰＣ鋼棒３１に張力を与えることにより、コンクリート構造物３０の端面から離れた位置に移動したナット１６を、コンクリート構造物３０の端面を押し付ける位置まで回転させて移動させている。
図１（Ａ）の状態から、操作機構５の雌ねじ部であるナット１４を、中間連結部材１２の雄ねじ部１２ａに対して相対回転させることで、平行リンク機構４のリンク角度を図１（Ｂ）のように小さくして行くと、第１の支持体２と第２の支持体３との間隔が広がり、これによりＰＣ鋼棒３１が引っ張られて伸び（伸び量をＬで示す）所定の張力が与えられる。このとき、ナット１６は、ＰＣ鋼棒３１の延びに従って、同図に鎖線で示すようにコンクリート構造物３０の端面から離れる。所定の張力が付与されると、前記ナット１６を、コンクリート構造物３０の端面に押し付けることにより、張力付与作業が完了する。 FIG. 1A shows a state before a predetermined tension is applied to the PC steel bar 31 by the tensioning device 1, and FIG. 1B shows a state after the tension is applied. In FIG. 1B, by applying tension to the PC steel bar 31, the nut 16 moved to a position away from the end face of the concrete structure 30 is rotated to a position where the end face of the concrete structure 30 is pressed. It is moved.
From the state of FIG. 1 (A), the link angle of the parallel link mechanism 4 is changed to that shown in FIG. 1 (B) by rotating the nut 14 which is the female threaded portion of the operating mechanism 5 relative to the male threaded portion 12a of the intermediate connecting member 12. ), The distance between the first support 2 and the second support 3 increases, whereby the PC steel rod 31 is pulled and stretched (the amount of elongation is indicated by L). Tension is applied. At this time, the nut 16 moves away from the end surface of the concrete structure 30 as shown by a chain line in FIG. When a predetermined tension is applied, the tension application operation is completed by pressing the nut 16 against the end surface of the concrete structure 30.

付与張力につき説明する。前記操作機構５のナット１４を回転レバー１５で回転操作することで、第１の中間部材６と第２の中間部材７の間の間隔が短くなる。この間隔の短縮量から、ＰＣ鋼棒３１の伸び量Ｌを以下のように算出することができ、その伸び量ＬからＰＣ鋼棒３１に与えられる張力Ｆを求めることができる。これにより、ＰＣ鋼棒３１に与える張力をコントロールすることができる。
図２に示すように、前記平行リンク機構４における第１の中間部材６と第２の中間部材７の間の間隔の１／２をｈ、リンク部材８〜１１の長さをｆ、第１の支持体２と第２の支持体３の間のＰＣ鋼棒３１の長さの１／２をｄとし、前記操作により前記値ｈがΔｈだけ短くなったとした場合、ＰＣ鋼棒３１の伸び量Ｌは、
Ｌ＝√（ｆ2 −（ｈ−Δｈ）2 ）−ｄ ……（１）
となる。ＰＣ鋼棒３１の全長をＬ’とすれば、
Ｌ／Ｌ’＝ε ……（２）
σ＝ε・Ｅ ……（３）
となる。ただし、ＥはＰＣ鋼棒３１のヤング係数（既知）である。これにより、ＰＣ鋼棒３１の張力Ｆを、
Ｆ＝σ・Ａ ……（４）
として求めることができる。ただし、ＡはＰＣ鋼棒３１の断面積（既知）である。 The applied tension will be described. By rotating the nut 14 of the operation mechanism 5 with the rotary lever 15, the interval between the first intermediate member 6 and the second intermediate member 7 is shortened. From the shortening amount of the interval, the elongation amount L of the PC steel rod 31 can be calculated as follows, and the tension F applied to the PC steel rod 31 can be obtained from the elongation amount L. Thereby, the tension applied to the PC steel bar 31 can be controlled.
As shown in FIG. 2, h is the half of the distance between the first intermediate member 6 and the second intermediate member 7 in the parallel link mechanism 4, the length of the link members 8 to 11 is f, When the half of the length of the PC steel rod 31 between the support 2 and the second support 3 is d and the value h is reduced by Δh by the above operation, the elongation of the PC steel rod 31 The quantity L is
L = √ (f 2 − (h−Δh) 2 ) −d (1)
It becomes. If the total length of the PC steel bar 31 is L ′,
L / L ′ = ε (2)
σ = ε · E (3)
It becomes. However, E is the Young's modulus (known) of the PC steel bar 31. Thereby, the tension F of the PC steel bar 31 is
F = σ · A (4)
Can be obtained as However, A is a cross-sectional area (known) of the PC steel bar 31.

また、このように算出されるＰＣ鋼棒３１の張力Ｆに基づいて、前記操作機構５による操作でのトルク管理を以下のように行うことができる。なお、以下の説明は、コンクリート構造物３０が例えばプレストレス基礎の場合を示す。
ＰＣ鋼棒３１に張力が与えられる前の状態での前記緊張装置１における第１の支持体２の部分での各寸法が図３（Ａ）の値であるとする。ＰＣ鋼棒３１に与える所要の張力がＦ１であると、その張力Ｆ１を受けるときの伸び量ｂ１は上記した演算（１）〜（４）から逆算して求めることができる。そこで、図３（Ｂ）のように、ＰＣ鋼棒３１が伸び量ｂ１だけ伸びた時に、ナット１６が第１の支持体２における脚部１８の基端面に当接するような、脚部１８の長さａ１の第１の支持体２を選択して使用する。この場合に、ナット１６の長さをｃとすると、このときの第１の支持体２の脚部１８の長さａ１は、
ａ１＝ｃ＋ｂ１ ……（５）
となる。すなわち、第１の支持体２として、長さ（ｃ＋ｂ１）の脚部１８を有するものを使用して、ナット１６の端面が前記脚部１８の基端面に当接するまで、緊張装置１における操作機構５の回転レバー１５を回すと、ＰＣ鋼棒３１へ所要の張力Ｆ１の付与が完了する。 Further, based on the tension F of the PC steel bar 31 calculated in this way, torque management in the operation by the operation mechanism 5 can be performed as follows. In addition, the following description shows the case where the concrete structure 30 is a prestress foundation, for example.
Assume that each dimension in the portion of the first support 2 in the tensioning device 1 in the state before the tension is applied to the PC steel bar 31 is the value shown in FIG. If the required tension applied to the PC steel bar 31 is F1, the elongation amount b1 when receiving the tension F1 can be obtained by reverse calculation from the above-described calculations (1) to (4). Therefore, as shown in FIG. 3 (B), when the PC steel bar 31 is extended by the extension amount b1, the leg portion 18 is such that the nut 16 comes into contact with the base end surface of the leg portion 18 in the first support 2. The first support 2 having a length a1 is selected and used. In this case, if the length of the nut 16 is c, the length a1 of the leg portion 18 of the first support 2 at this time is:
a1 = c + b1 (5)
It becomes. That is, the operation mechanism in the tension device 1 is used until the end surface of the nut 16 abuts on the base end surface of the leg portion 18 using the first support body 2 having the leg portion 18 of length (c + b1). When the rotary lever 15 is turned, the application of the required tension F1 to the PC steel rod 31 is completed.

このように、このＰＣ鋼棒の緊張装置１は、ＰＣ鋼棒３１が突出するコンクリート構造物３０の端面に押し当てられる第１の支持体２と、ＰＣ鋼棒３１の突出部に着脱可能に取付けられる第２の支持体３と、これらの各支持体２，３に連結されて両支持体２，３の間隔を変更する平行リンク機構４と、この平行リンク機構４のリンク角度を変更する操作機構５とで構成されているので、構成が簡単かつ軽量で、一人の作業者により容易に操作できる。   As described above, the tension device 1 for the PC steel bar can be attached to and detached from the first support 2 pressed against the end surface of the concrete structure 30 from which the PC steel bar 31 protrudes, and the protruding portion of the PC steel bar 31. A second support 3 to be attached, a parallel link mechanism 4 connected to each of the supports 2 and 3 to change the distance between the supports 2 and 3, and a link angle of the parallel link mechanism 4 is changed. Since it is comprised with the operation mechanism 5, a structure is simple and lightweight, and it can operate easily by one operator.

（Ａ）はこの発明の一実施形態にかかるＰＣ鋼棒の緊張装置を使用してＰＣ鋼棒に張力を与える前の状態の説明図、（Ｂ）は張力を与えた後の状態の説明図である。(A) is explanatory drawing of the state before giving tension to PC steel bar using the tension device of PC steel bar concerning one embodiment of this invention, (B) is explanatory drawing of the state after giving tension. It is. 同緊張装置における平行リンク機構のリンク角度変化から張力を求める演算の説明図である。It is explanatory drawing of the calculation which calculates | requires tension | tensile_strength from the link angle change of the parallel link mechanism in the tension device. 同緊張装置の第１の支持体における脚部の長さとＰＣ鋼棒に与えられる張力の関係を示す説明図である。It is explanatory drawing which shows the relationship between the length of the leg part in the 1st support body of the tensioning apparatus, and the tension | tensile_strength given to a PC steel rod.

符号の説明Explanation of symbols

１…ＰＣ鋼棒の緊張装置
２…第１の支持体
３…第２の支持体
４…平行リンク機構
５…操作機構
６…第１の中間部材
６ａ…挿通孔
７…第２の中間部材
８〜１１…リンク部材
１２…中間連結部材
１２ａ…雄ねじ部
１３…ねじ結合部
１４…ナット（雌ねじ部）
１６…ナット
１７…リンク連結体部
１７ａ…挿通孔
１８…脚部
３０…コンクリート構造物
３１…ＰＣ鋼棒
３１ａ…突出部（雄ねじ部） DESCRIPTION OF SYMBOLS 1 ... Tensioning device 2 of PC steel rod 2 ... 1st support body 3 ... 2nd support body 4 ... Parallel link mechanism 5 ... Operation mechanism 6 ... 1st intermediate member 6a ... Insertion hole 7 ... 2nd intermediate member 8 -11 ... Link member 12 ... Intermediate connecting member 12a ... Male screw part 13 ... Screw coupling part 14 ... Nut (female screw part)
16 ... Nut 17 ... Link connecting body 17a ... Insertion hole 18 ... Leg 30 ... Concrete structure 31 ... PC steel bar 31a ... Protrusion (male thread)

Claims (3)

コンクリート構造物の端面から突出するＰＣ鋼棒に対して所定の張力を与えるＰＣ鋼棒の緊張装置であって、
前記ＰＣ鋼棒が突出する前記コンクリート構造物の端面に押し当てられる第１の支持体と、前記ＰＣ鋼棒の突出部に着脱可能に取付けられる第２の支持体と、前記第１の支持体および第２の支持体に連結されてこれら第１の支持体と第２の支持体との間隔を変更する平行リンク機構と、
この平行リンク機構のリンク角度を変更する操作機構とを備え、
前記平行リンク機構は、前記第１の支持体と第２の支持体の間に位置する第１および第２の中間部材と、前記第１の支持体と第１の中間部材の間、第１の支持体と第２の中間部材の間、前記第２の支持体と第１の中間部材の間、および第２の支持体と第２の中間部材との間にそれぞれ回動自在に連結された第１ないし第４のリンク部材とを有し、
前記操作部材は、前記平行リンク機構の前記第１の中間部材と第２の中間部材とを連結した中間連結部材と、互いに螺合した雄ねじ部および雌ねじ部を有しこれら雄ねじ部と雌ねじ部の相対回転により前記中間連結部材の第１または第２の中間部材との連結部位を変えるねじ結合部とを有する、ＰＣ鋼棒の緊張装置。 A tensioning device for a PC steel bar that applies a predetermined tension to a PC steel bar protruding from an end surface of a concrete structure,
A first support that is pressed against an end surface of the concrete structure from which the PC steel bar protrudes; a second support that is detachably attached to a protrusion of the PC steel bar; and the first support. And a parallel link mechanism coupled to the second support to change the distance between the first support and the second support;
An operation mechanism for changing the link angle of the parallel link mechanism,
The parallel link mechanism includes first and second intermediate members positioned between the first support body and the second support body, and between the first support body and the first intermediate member, Between the second support member and the second intermediate member, between the second support member and the first intermediate member, and between the second support member and the second intermediate member. First to fourth link members,
The operating member includes an intermediate connecting member that connects the first intermediate member and the second intermediate member of the parallel link mechanism, and a male screw portion and a female screw portion that are screwed together. A tensioner for a PC steel rod, comprising: a screw coupling portion that changes a connection portion of the intermediate connection member with the first or second intermediate member by relative rotation. 請求項１において、前記操作機構の前記中間連結部材は、一端が前記第２の中間部材に固定され、他端が前記第１の中間部材に形成された挿通孔に挿通されて、前記ねじ結合部の前記雄ねじ部とされ、前記雌ねじ部は、前記中間連結部材の前記雄ねじ部における前記第１の中間部材から第２の中間部材と反対側に突出した部分に螺合したナットであるＰＣ鋼棒の緊張装置。   2. The screw coupling according to claim 1, wherein one end of the intermediate coupling member of the operation mechanism is fixed to the second intermediate member, and the other end is inserted into an insertion hole formed in the first intermediate member. PC steel which is a nut screwed into a portion protruding from the first intermediate member to the opposite side of the second intermediate member in the male screw portion of the intermediate connecting member Stick tensioning device. 請求項１または請求項２において、前記ＰＣ鋼棒の前記コンクリート構造物の端面からの突出部が雄ねじ部とされ、この雄ねじ部に、前記コンクリート構造物の端面を押し付けるナットが設けられ、前記第１の支持体は、前記ＰＣ鋼棒が挿通される挿通孔を有し前記平行リンク機構が連結されるリンク連結体部と、このリンク連結体部から延びて前記ナットに非接触で跨がり先端が前記コンクリート構造物の端面に当接する脚部とを有するＰＣ鋼棒の緊張装置。   In Claim 1 or Claim 2, the protrusion part from the end surface of the concrete structure of the PC steel bar is made into a male screw part, and the nut which presses the end surface of the concrete structure is provided in this male screw part, The support body 1 has an insertion hole through which the PC steel rod is inserted, and a link connecting body portion to which the parallel link mechanism is connected, and extends from the link connecting body portion and straddles the nut in a non-contact manner. A tensioning device for a PC steel bar having a leg portion that abuts against an end face of the concrete structure.
JP2008005540A 2008-01-15 2008-01-15 Prestressing bar tensioner Pending JP2009167653A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103103924A (en) * 2013-01-22 2013-05-15 北京工业大学 Angle self-adaptation beam bridge vertical prestressing force tensioning counter-force seat
CN105625639A (en) * 2016-01-08 2016-06-01 苏交科集团股份有限公司 Curling type tensioning and anchoring system for carbon fiber cloth
CN112282409A (en) * 2020-09-07 2021-01-29 中国建筑第八工程局有限公司 Top-supporting type carbon fiber prestress tensioning structure and tensioning method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103103924A (en) * 2013-01-22 2013-05-15 北京工业大学 Angle self-adaptation beam bridge vertical prestressing force tensioning counter-force seat
CN103103924B (en) * 2013-01-22 2015-01-21 北京工业大学 Angle self-adaptation beam bridge vertical prestressing force tensioning counter-force seat
CN105625639A (en) * 2016-01-08 2016-06-01 苏交科集团股份有限公司 Curling type tensioning and anchoring system for carbon fiber cloth
CN105625639B (en) * 2016-01-08 2017-12-29 苏交科集团股份有限公司 The tensioning of carbon cloth rolling and anchor system
CN112282409A (en) * 2020-09-07 2021-01-29 中国建筑第八工程局有限公司 Top-supporting type carbon fiber prestress tensioning structure and tensioning method
CN112282409B (en) * 2020-09-07 2022-07-12 中国建筑第八工程局有限公司 Top-supporting type carbon fiber prestress tensioning structure and tensioning method

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