JP5351403B2 - A tension release device for a tension material and a tension release method for the tension material using the tension release device. - Google Patents

A tension release device for a tension material and a tension release method for the tension material using the tension release device. Download PDF

Info

Publication number
JP5351403B2
JP5351403B2 JP2007261901A JP2007261901A JP5351403B2 JP 5351403 B2 JP5351403 B2 JP 5351403B2 JP 2007261901 A JP2007261901 A JP 2007261901A JP 2007261901 A JP2007261901 A JP 2007261901A JP 5351403 B2 JP5351403 B2 JP 5351403B2
Authority
JP
Japan
Prior art keywords
tension
wedge
release
tendon
receiver
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2007261901A
Other languages
Japanese (ja)
Other versions
JP2009091764A (en
Inventor
英克 板谷
征哉 嶋根
亮介 黒輪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyokuto Kogen Concrete Shinko Co Ltd
Original Assignee
Kyokuto Kogen Concrete Shinko Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyokuto Kogen Concrete Shinko Co Ltd filed Critical Kyokuto Kogen Concrete Shinko Co Ltd
Priority to JP2007261901A priority Critical patent/JP5351403B2/en
Publication of JP2009091764A publication Critical patent/JP2009091764A/en
Application granted granted Critical
Publication of JP5351403B2 publication Critical patent/JP5351403B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Bridges Or Land Bridges (AREA)
  • Reinforcement Elements For Buildings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for releasing a tensioning force of a tendon, which enables a wedge connection between a wedge and a wedge retainer to be surely released without reference to the constitution of the tendon, and a construction method for releasing the tensioning force of the tendon. <P>SOLUTION: This device comprises: the wedge retainer 8 for bearing reaction of a tensioning force introduction device 1 for introducing the tensioning force into the tendon 3; the wedge 9 into which the tendon 3 is inserted, and which is engaged with the wedge retainer 8 in the state of integration with the tendon 3; and a reaction bearing member 6A which bears the tensioning force from the wedge 9 and inhibits the wedge 9 from moving in the direction of getting closer to the wedge retainer 8, when the tendon 3 is pulled by the tensioning force introduction device 1 and moved in the direction of isolation from the wedge retainer 8. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

本発明は、コンクリートや鉄筋コンクリート等の構造体の内外に配置された緊張材に導入された緊張力を解放させる目的で使用される緊張材の緊張力解放装置及びにその緊張力解放装置を用いた緊張材の緊張力解放工法に関する。   The present invention uses a tension release device for a tension member used for the purpose of releasing a tension force introduced to a tension member arranged inside or outside a structure such as concrete or reinforced concrete, and the tension release device. It relates to the tension release method for tendons.

例えば、橋桁を一定区間単位で構築しながら架設する工法(張り出し架設工法)において、橋桁が1体の橋脚に支持される際の床板等の変位や変形を防止するために、橋桁の内外に設置された緊張材に一時的にプレストレス(緊張力)を導入して緊張材を構造体に定着させることがあるが、橋桁の完成時にはこのプレストレスは無用になるため、解放されなければならない。   For example, in a construction method (overhang construction method) in which a bridge girder is constructed while building a certain section unit, it is installed inside and outside the bridge girder to prevent displacement and deformation of the floorboard etc. when the bridge girder is supported by a single pier. There is a case where prestress (tensile force) is temporarily introduced into the tensioned material to fix the tensioning material to the structure, but this prestress becomes useless when the bridge girder is completed, and must be released.

橋桁の完成時に緊張材の緊張力を解放するために、例えば、支圧板部とチェック部を構成するスリーブ(くさび受具)との間に介在されたシム部材を有し、支圧板部にはスリーブに対向する凸部(例えば筒状部材)が設けられている緊張力解放装置が提案されている(例えば特許文献1参照)。   In order to release the tension of the tension member when the bridge girder is completed, for example, the bearing plate has a shim member interposed between the bearing plate and the sleeve (wedge holder) constituting the check unit. There has been proposed a tension release device provided with a convex portion (for example, a cylindrical member) facing the sleeve (see, for example, Patent Document 1).

この緊張力解放装置を利用してPC鋼線の緊張力を解放するには、PC鋼線に緊張力を付与することでスリーブに係合してPC鋼線を掴持しているウェッジ(くさび)をスリーブと一体化した状態で浮上させている際に、シム部材を除去し、緊張力を緩めて一体化したくさびとくさび受具(チェック部)を構造物側へ移動させることで支圧板部の凸部にウェッジのみを当接させて、ウェッジとスリーブの係合を解除する。   In order to release the tension of the PC steel wire by using this tension release device, a wedge (wedge) that engages the sleeve and holds the PC steel wire by applying tension to the PC steel wire. ) Is lifted in a state of being integrated with the sleeve, the shim member is removed, the tension force is loosened, and the integrated wedge and wedge receiver (check part) are moved to the structure side to move the bearing plate Only the wedge is brought into contact with the convex portion of the portion, and the engagement between the wedge and the sleeve is released.

特開2005−60935号公報(段落0027〜0028、図1、図6〜図7)Japanese Patent Laying-Open No. 2005-60935 (paragraphs 0027 to 0028, FIGS. 1 and 6 to 7)

特許文献1ではPC鋼線は1本で構成されているが、PC鋼線は複数本で構成されることもあり、PC鋼線の本数は近年増加傾向にある。また、一般的にスリーブは厚く構成されており、体積や重さに関してチャック部の中で大きな割合を占めている。したがって、PC鋼線が多くなるとスリーブが大きくなるので、チャック部の重さも増大する。   In Patent Document 1, one PC steel wire is configured, but a plurality of PC steel wires may be configured, and the number of PC steel wires has been increasing in recent years. In general, the sleeve is configured to be thick and occupies a large proportion of the chuck portion with respect to volume and weight. Therefore, as the PC steel wire increases, the sleeve becomes larger, and the weight of the chuck portion also increases.

PC鋼線は地表面に対して様々な角度で設置されるが、PC鋼線が地表面に直交して設置される場合を除いて、PC鋼線はチャック部に懸垂される形となってチャック部から鉛直下向きに力を受ける。したがって、ウェッジの底面を凸部に当接させるために緊張力の緩められたPC鋼線はチャック部によって撓み、PC鋼線の軸線方向が変化する。この結果、構造体に定着している支圧板部に設けられている凸部の方向と、PC鋼線の軸線方向とが一致しなくなるので、緊張材を緩めても凸部がウェッジの底面に適切に当接しない場合がある。   PC steel wire is installed at various angles with respect to the ground surface. Except for the case where PC steel wire is installed perpendicular to the ground surface, PC steel wire is suspended from the chuck part. Receives force from the chuck part vertically downward. Therefore, the PC steel wire whose tension is loosened to bring the bottom surface of the wedge into contact with the convex portion is bent by the chuck portion, and the axial direction of the PC steel wire changes. As a result, the direction of the convex portion provided on the bearing plate fixed to the structure and the axial direction of the PC steel wire do not coincide with each other, so that even if the tension material is loosened, the convex portion remains on the bottom surface of the wedge. It may not contact properly.

また、PC鋼線の緊張力を緩める前に、例えば最初にウェッジがスリーブに設置される際に、ウェッジとスリーブが強固に楔結合していると、ウェッジが凸部に当接してもウェッジとスリーブとの楔結合が解除されない場合がある。このように、特許文献1に記載の発明では、ウェッジとスリーブとの楔結合が確実に解除されない。   In addition, before loosening the tension of the PC steel wire, for example, when the wedge is first installed on the sleeve, if the wedge and the sleeve are firmly wedge-coupled, the wedge The wedge connection with the sleeve may not be released. Thus, in the invention described in Patent Document 1, the wedge connection between the wedge and the sleeve is not reliably released.

本発明の目的は斯かる課題に鑑みてなされたもので、緊張材の構成によらず確実にくさびとくさび受具との楔結合を解除することができる緊張材の緊張力解放装置及び緊張材の緊張力解放工法を提供することである。   An object of the present invention has been made in view of such a problem, and a tension material releasing device and a tension material for a tension material that can reliably release the wedge connection between the wedge and the wedge receiver regardless of the configuration of the tension material. Is to provide a tension release method.

請求項1に係る緊張材の緊張力解放装置は、緊張材に緊張力を導入する緊張力導入装置の反力を負担するくさび受具と、前記緊張材が挿通し、前記緊張材と一体化した状態で前記くさび受具に係合するくさびと、前記緊張材が前記緊張力導入装置に引っ張られて前記くさび受具から離れる向きへ移動したときに、前記くさびからの緊張力を負担し、前記くさびの前記くさび受具に近づく向きへの移動を阻止する反力負担部材とを有し、前記反力負担部材は、前記くさび受具と構造体との間で前記緊張材の軸線方向に摺動自在に配置されたリリースチューブ押さえ部材と、前記緊張材上で前記くさびと前記リリースチューブ押さえ部材との間に前記緊張材の軸線方向に摺動自在に配置され、前記くさび受具に構造体側の端面から挿入された状態で前記リリースチューブ押さえ部材に係止されたリリースチューブとから構成されることを特徴とする。
緊張材が緊張力導入装置に引っ張られる前から緊張材に緊張力が導入されていると、緊張材は既に延びているが、緊張材が緊張力導入装置に引っ張られると、緊張材は更に延びる。また、くさび受具は緊張力導入装置に付与される反力を負担し、その反力は構造体が付与するするので、緊張力導入装置によって緊張力が緊張材に導入されている際には、くさび受具は構造体に対して固定している。
したがって、緊張材が緊張力導入装置によって引っ張られると、緊張材が緊張力導入装置の方へ延びると共に、くさびがくさび受具から遠ざかる向きへ移動して、すなわち、くさび受具から離れて、くさびとくさび受具との係合が確実に解除される。
緊張材が緊張力導入装置に引っ張られることによって、くさびとくさび受具との係合が解かれるので、係合を解かれたくさびが反力負担部材によってくさび受具に近づく向きへの移動が阻止されると、くさびとくさび受具との係合の解除は維持される。
くさびのくさび受具に近づく向きへの移動が阻止された状態が維持されたまま、緊張材の延びが戻されると、緊張材の緊張力は解放される。ここで、反力負担部材はくさびのくさび受具に近づく向きへ移動を阻止するためにくさびに付与される反力を負担するが、反力の向きは緊張材の軸線方向に対してくさびがくさび受具から遠ざかる向き(構造体からくさび受具へ進む向き)である。
前記緊張材を定着させる定着具に被せた状態で前記構造体と前記緊張力導入装置との間設置され、前記緊張力導入装置を支持することもある(請求項2)。すなわち、緊張力解放装置が緊張力解放用チェアとして適用される場合がある。この場合、緊張力解放装置は1つの緊張力導入装置に対して1つ使用される。
また、本発明はこのように緊張力解放用チェアとして適用される他、定着具として適用される場合もある。定着具は一般的には構造体に多数設置され、複数の定着具に対して1つの緊張力導入装置が利用される。したがって、緊張力解放装置が緊張力解放用チェアとして適用される場合、定着具として適用される場合に比して使用される緊張力解放装置の個数が少なく、経済性が高い。
さらに、緊張力解放装置が定着具として適用された場合、緊張力解放装置は養生されなければその使用期間中ずっと外部に露呈されるので、錆びによる劣化によって機能が低下し、又は使用できなくなる蓋然性が高くなる。仮に、キャップ等によって緊張力導入装置を養生すれば、コストが高くなる。
これに対して、緊張力解放装置が緊張力解放用チェアとして適用された場合、緊張力解放装置は緊張力導入装置と共に緊張力解放作業時にのみ使用されるので、通常の管理を行っていれば錆びることはない。
前記反力負担部材は前記くさび受具に対して前記緊張材の軸線方向に配置されていることもある(請求項3)。くさびは緊張材が挿通しているので緊張材の軸線方向に配置され、反力負担部材と同一線上に位置する。したがって、くさびは反力負担部材から緊張材の軸線方向に対してくさび受具から遠ざかる向きに力を受けてくさび受具に近づく向きへの移動が阻止される。この結果、緊張材が複数本の線材で構成され、線材が例えば格子状に配置されても、内側に配置されている線材も確実にくさび受具との係合が解除される。
前記反力負担部材を支持する支持部材を有することもある(請求項4)。この場合、反力負担部材を支持するために、所定の道具(例えば小型ジャッキ等)を使用する必要がないので、施工費用が削減される。
前記反力負担部材が前記くさび受具に対して前記緊張材の軸線方向に摺動可能に配置され、緊張力が導入されている前記緊張材が挿通している前記くさびを前記くさび受具に近づく向きへ移動させ、前記くさびを前記くさび受具に係合させるように誘導する係合誘導部材を有する(請求項5)。
反力負担部材がくさび受具に対して緊張材の軸線方向に摺動可能であるので、上記くさびの移動の阻止を解除することができる。その移動の阻止が解除された状態から、係合誘導部材を用いて再度くさびとくさび受具を係合させることによって、緊張材を仮定着させることができるので、緊張材導入装置を盛り替えることが可能となる。
くさびのくさび受具との係合が解除される前から緊張材に緊張力が導入されて緊張材が延びている場合、緊張材が緊張力導入装置に引っ張られ、くさびのくさび受具との係合が解除されると、緊張材は更に延びる。このくさびとくさび受具との係合が解除された状態が保持されたまま、緊張力導入装置のジャッキストロークが縮減されると緊張材の延びが戻る。
上記係合を解除させるためには緊張力導入装置のジャッキストロークを伸長させなければならないが、その量はジャッキストロークの縮減能力に対して十分小さいので、ジャッキストロークを縮減させると、緊張材の延びは当初の緊張材の延びより小さくなる。そこで、係合誘導部材によってくさびをくさび受具に近づく方向に移動させて係合させると、くさび受具は固定されているので、くさびの緊張材に対する設置箇所が変更される。したがって、緊張力導入装置の使用可能なジャッキストロークの縮減量より当初の緊張材の延び量の方が大きくても、くさびの緊張材に対する設置箇所を段階的に端部側(緊張力導入装置側)に移動させて、緊張力導入装置の盛り替作業を繰り返すことで、緊張材の緊張力を完全に解放することができる。
請求項6に係る緊張材の緊張力解放方法は、前記緊張材を前記緊張力導入装置によって引っ張り、前記くさびと前記くさび受具の係合を解除する係合解除工程と、請求項5に記載の緊張力解放装置の反力負担部材を用いて前記係合の解放状態を維持する係合解除維持工程とを有することを特徴とする。この場合、請求項1乃至4と同一の作用・効果を奏することができる。
前記係合維持工程の後に、前記緊張材の緊張力解放装置の前記係合誘導部材を用いて前記くさびを前記くさび受具に近づく向きへ移動させて前記くさびと前記くさび受具とを係合させ、前記緊張材を定着させる盛替工程を有することもある(請求項7)。したがって、緊張材の緊張力解放装置の係合誘導部材によって緊張力導入装置の盛り替作業を行うことが可能となり、緊張材の延び量が緊張力導入装置のジャッキストロークより大きい場合であっても緊張材の緊張力を段階的に解放していくことができる。
A tension force release device for a tension material according to claim 1 is integrated with the tension material through a wedge receiver that bears a reaction force of a tension force introduction device that introduces tension force to the tension material, and the tension material. A wedge that engages with the wedge receiver in a state where the tension member is pulled by the tension force introducing device and moves away from the wedge receiver, and bears the tension force from the wedge; A reaction force bearing member that prevents movement of the wedge in a direction approaching the wedge receiver, and the reaction force bearing member is disposed between the wedge receiver and the structure in the axial direction of the tension material. A release tube pressing member that is slidably disposed on the tension member, and is slidably disposed in the axial direction of the tension member between the wedge and the release tube pressing member on the tension member, and is structured in the wedge receiver. Inserted from the end face on the body side Characterized in that it is composed and the release tube retainer locked release tube member.
If the tension is introduced to the tension material before the tension material is pulled by the tension introduction device, the tension material is already extended, but if the tension material is pulled by the tension introduction device, the tension material further extends. . In addition, the wedge receiver bears the reaction force applied to the tension introduction device, and the reaction force is applied by the structure, so when the tension force is introduced into the tension material by the tension introduction device. The wedge receiver is fixed to the structure.
Therefore, when the tension material is pulled by the tension introducing device, the tension material extends toward the tension introducing device and the wedge moves away from the wedge receiver, that is, away from the wedge receiver, the wedge. The engagement with the wedge receiver is reliably released.
Since the tension material is pulled by the tension force introducing device, the engagement between the wedge and the wedge receiver is released, so that the released wedge is moved by the reaction force bearing member toward the wedge receiver. When blocked, the disengagement between the wedge and the wedge holder is maintained.
When the extension of the tendon is returned while the state where the movement of the wedge toward the wedge receiver is prevented is maintained, the tension of the tendon is released. Here, the reaction force bearing member bears the reaction force applied to the wedge in order to prevent the wedge from moving toward the wedge receiver, but the direction of the reaction force is the wedge with respect to the axial direction of the tension material. The direction is away from the wedge receiver (the direction from the structure to the wedge receiver).
It may be installed between the structure and the tension introduction device in a state where it is covered with a fixing tool for fixing the tension material to support the tension introduction device (Claim 2). That is, the tension release device may be applied as a tension release chair. In this case, one tension release device is used for one tension introduction device.
In addition to being applied as a tension release chair as described above, the present invention may be applied as a fixing tool. In general, a large number of fixing tools are installed in the structure, and one tension introducing device is used for a plurality of fixing tools. Therefore, when the tension release device is applied as a tension release chair, the number of the tension release devices used is smaller than that when the tension release device is applied as a fixing tool, which is economical.
Furthermore, when the tension release device is applied as a fixing tool, the tension release device is exposed to the outside during its use period unless it is cured. Becomes higher. If the tension introducing device is cured with a cap or the like, the cost increases.
On the other hand, when the tension release device is applied as a tension release chair, the tension release device is used only during the tension release work together with the tension introduction device. It will not rust.
The reaction force bearing member may be disposed in the axial direction of the tendon with respect to the wedge receiver (Claim 3). Since the tendon is inserted through the wedge, the wedge is arranged in the axial direction of the tendon and is located on the same line as the reaction force bearing member. Accordingly, the wedge is prevented from moving in a direction approaching the wedge receiver by receiving a force in a direction away from the wedge receiver in the axial direction of the tension material from the reaction force bearing member. As a result, the tension member is composed of a plurality of wire rods, and even if the wire rods are arranged in a lattice shape, for example, the wire rods arranged on the inner side are reliably disengaged from the wedge receiver.
There may be provided a support member for supporting the reaction force bearing member. In this case, since it is not necessary to use a predetermined tool (for example, a small jack) in order to support the reaction force bearing member, the construction cost is reduced.
The reaction force bearing member is arranged to be slidable in the axial direction of the tendon with respect to the wedge receiver, and the wedge through which the tension material into which the tension force is introduced is inserted into the wedge receiver. It has an engagement guide member which moves in the approaching direction and guides the wedge to engage with the wedge receiver (Claim 5).
Since the reaction force bearing member is slidable in the axial direction of the tension material with respect to the wedge receiver, the prevention of the movement of the wedge can be released. From the state where the blocking of the movement is released, the tension material can be presumed by engaging the wedge and the wedge receiver again by using the engagement guide member, so the tension material introducing device is replaced. Is possible.
If the tension is introduced to the tension material before the wedge is released from the wedge receiver and the tension material is extended, the tension material is pulled by the tension introduction device, and the wedge When the engagement is released, the tendon further extends. When the jack stroke of the tension introducing device is reduced while the state where the engagement between the wedge and the wedge receiver is released is maintained, the extension of the tension member returns.
In order to release the above-mentioned engagement, the jack stroke of the tension introducing device must be extended, but the amount is sufficiently small with respect to the jack stroke reduction capability. Is smaller than the initial stretch of tension material. Therefore, when the wedge is moved by the engagement inducing member in the direction approaching the wedge holder and engaged, the wedge receiver is fixed, so that the installation location of the wedge with respect to the tension member is changed. Therefore, even if the extension amount of the initial tension material is larger than the reduction amount of the jack stroke that the tension force introduction device can be used, the installation position of the wedge with respect to the tension material is gradually changed to the end side (the tension force introduction device side). ) And repeating the reordering work of the tension force introducing device, the tension force of the tension material can be completely released.
Tension release methods tendon according to claim 6, wherein the tension of the tension member by the tensioning force introduction device, a disengagement step of releasing the engagement of said wedge receiving fixture and the wedge, according to claim 5 And a disengagement maintaining step of maintaining the disengaged state using the reaction force bearing member of the tension releasing device. In this case, the same actions and effects as those of claims 1 to 4 can be achieved.
After said engaging step of maintaining engagement with said wedge receiving fixture and the wedge is moved in the direction approaching the wedge into the wedge receiving fixture using said engagement induction member tension release device of the tendon And a refilling step for fixing the tendon material (claim 7). Therefore, it becomes possible to perform the reworking work of the tension introduction device by the engagement guide member of the tension release device of the tension material, even if the extension amount of the tension material is larger than the jack stroke of the tension introduction device. The tension of the tension material can be released gradually.

本発明は上記の通り、固定されたくさび受具と、緊張材と一体となった状態でくさび受具と係合するくさびと、緊張力導入装置に引っ張られてくさび受具から離れたくさびのくさび受具に近づく向きへの移動を阻止するためにくさびに反力を付与する反力負担部材とを有するので、緊張材の構成によらず確実にくさびとくさび受具との楔結合を解除することができる。   As described above, the present invention includes a fixed wedge receiver, a wedge that engages with the wedge receiver in an integrated state with the tension member, and a wedge that is pulled away from the wedge receiver by being pulled by the tension introduction device. Because it has a reaction force bearing member that applies a reaction force to the wedge in order to prevent movement in the direction approaching the wedge holder, the wedge connection between the wedge and the wedge holder is reliably released regardless of the configuration of the tension material can do.

以下、図面に基づいて本発明の実施の形態を詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(実施の形態1)
図1に示すように、本発明の構成例の1つである緊張力解放装置1は公知の定着具に組み込まれた構造を成し、定着具としての機能も有するので、緊張力解放装置1によって緊張材3が構造体2に定着して緊張している。緊張力解放装置1は例えば構造体2である鉄筋コンクリートの橋桁に設置され、緊張材3は押し出し工法によって構造体2を架設するために一時的に補強することを目的に仮緊張状態におかれている。ここでは、緊張力解放装置1は緊張状態を解除することを前提として設置されている。
(Embodiment 1)
As shown in FIG. 1, a tension force releasing device 1 which is one of the configuration examples of the present invention has a structure incorporated in a known fixing tool and also has a function as a fixing tool. As a result, the tendon 3 is fixed on the structure 2 and is in tension. For example, the tension release device 1 is installed on a reinforced concrete bridge girder, which is a structure 2, and the tension member 3 is placed in a temporary tension state for the purpose of temporarily reinforcing the structure 2 by an extrusion method. Yes. Here, the tension releasing device 1 is installed on the assumption that the tension state is released.

構造体2は主として鉄筋コンクリート造であるが、鉄骨造や鉄骨鉄筋コンクリート造の場合もある。また、本実施の形態では緊張材3は複数本(19本)の線材3aで構成されているが、緊張力解放装置1は1本で構成される緊張材3に対して使用されることも可能である。緊張材3には鉄筋やPC鋼線の他、ステンレス鋼、アラミドや炭素の繊維を用いた繊維強化材料が使用される。緊張材3は構造体2の内部に配置される場合と外部に配置される場合がある。   The structure 2 is mainly reinforced concrete, but may be steel or steel reinforced concrete. In the present embodiment, the tension member 3 is composed of a plurality (19) of the wire members 3a. However, the tension release device 1 may be used for the tension member 3 composed of one wire. Is possible. For the tendon 3, a fiber reinforced material using stainless steel, aramid, or carbon fibers is used in addition to reinforcing bars and PC steel wires. The tendon 3 may be arranged inside the structure 2 or outside.

また、緊張力解放装置1は構造体2を架設する場合の他に、緊張材に緊張力を一次、二次等段階的に行う場合、斜張橋用斜材を交換する場合、外ケーブルを交換する場合、トラブルが発生した場合等、様々な工種において緊張材の緊張力を解放する場合に使用される。   In addition to the case where the structure 2 is erected, the tension release device 1 can be used to apply tension to the tension material in a primary, secondary, etc. stage, when replacing the cable-stayed bridge diagonal material, When exchanging, when trouble occurs, it is used when releasing the tension of the tension material in various types of work.

図1に示すように、緊張力解放装置1は、緊張材3を構造体2に定着させ、緊張力を負担する定着部4と、定着部4に当接して定着部4が負担する緊張力を構造体2に伝達する支圧部5と、定着部4を構成する定着ブロック(くさび受具)8とウェッジ(くさび)9との係合が解除された状態を維持する係合解除維持部材6と、緊張力が解放された後に再度ウェッジ9を定着ブロック8に係合させて緊張材3を再定着させる再定着補助部7とからなる。   As shown in FIG. 1, the tension release device 1 fixes the tension material 3 to the structure 2, the fixing unit 4 that bears the tension, and the tension that the fixing unit 4 bears in contact with the fixing unit 4. The pressure bearing part 5 that transmits the pressure to the structure 2, and the disengagement maintaining member that maintains the disengaged state between the fixing block (wedge receiver) 8 and the wedge 9 that constitute the fixing part 4 6 and a re-fixing auxiliary section 7 for re-fixing the tension material 3 by re-engaging the wedge 9 with the fixing block 8 after the tension is released.

定着部4は定着ブロック8とウェッジ9からなり、引張力を受けている緊張材3が挿通している定着ブロック8に、緊張材3を挟み込んでいるウェッジ9が差し込まれて係合している。定着ブロック8は、例えばボルト(図示せず)によって支圧部5に固定され、支圧部5を介して構造体2に支持されている。   The fixing unit 4 includes a fixing block 8 and a wedge 9, and the wedge 9 sandwiching the tension material 3 is inserted and engaged with the fixing block 8 through which the tension material 3 receiving tensile force is inserted. . The fixing block 8 is fixed to the supporting pressure part 5 by, for example, a bolt (not shown) and supported by the structure 2 via the supporting pressure part 5.

図2(a)、(b)に示すように、定着ブロック8は例えば鋼製で円盤状又は円柱状を呈し、定着ブロック8には緊張材3を構成する線材3aの配列に対応した挿通孔8aが形成されている。挿通孔8aは緊張材3が挿通しているウェッジ9を差し込ませてウェッジ9と定着ブロック8とを係合させ、緊張材3を定着させることができる。   As shown in FIGS. 2A and 2B, the fixing block 8 is made of, for example, steel and has a disk shape or a columnar shape, and the fixing block 8 has an insertion hole corresponding to the arrangement of the wire members 3 a constituting the tension member 3. 8a is formed. The insertion hole 8a can fix the tension material 3 by inserting the wedge 9 through which the tension material 3 is inserted and engaging the wedge 9 with the fixing block 8.

また、例えば挿通孔8aが形成されている範囲の周囲には支圧部5に固定するためのボルト(図示せず)が挿入する挿入孔8bと、後述する伝達部材18を固定させるためのボルト(図示せず)が螺合する伝達部材螺合穴8cと、後述する係合誘導部材16を摺動させるための摺動手段17が螺合する摺動手段螺合穴8dとが形成されている。   Further, for example, an insertion hole 8b into which a bolt (not shown) for fixing to the pressure bearing portion 5 is inserted around a range where the insertion hole 8a is formed, and a bolt for fixing a transmission member 18 to be described later A transmission member screwing hole 8c into which (not shown) is screwed and a sliding means screwing hole 8d into which a sliding means 17 for sliding an engagement guiding member 16 described later is screwed are formed. Yes.

図1に示すように、支圧部5は第1支圧部構成部材10と第2支圧部構成部材11からなり、第1支圧部構成部材10と第2支圧部構成部材11とが直列に接続した状態で例えばボルト(図示せず)で固定されて構成され、円柱状を呈し、緊張材3が挿通している。   As shown in FIG. 1, the bearing part 5 includes a first bearing part constituting member 10 and a second bearing part constituting member 11, and the first bearing part constituting member 10, the second bearing part constituting member 11, and the like. Are connected in series and fixed with, for example, bolts (not shown), have a cylindrical shape, and the tension material 3 is inserted therethrough.

また、支圧部5は緊張材3の軸線方向と両構成部材10、11が直列に接続する方向とが一致するように構造体2に配置されている。第2支圧部構成部材11は構造体2に一体化したガイド12に固定され、第1支圧部構成部材10は、係合解除維持部材6に支圧部5の軸線方向に摺動自在に嵌入された状態で、定着ブロック8に固定されている。   Moreover, the bearing part 5 is arrange | positioned at the structure 2 so that the axial direction of the tension material 3 and the direction where both the structural members 10 and 11 connect in series may correspond. The second bearing member 11 is fixed to a guide 12 integrated with the structure 2, and the first bearing member 10 is slidable in the axial direction of the bearing 5 with respect to the disengagement maintaining member 6. Is fixed to the fixing block 8.

図3(a)〜(c)に示すように、第1支圧部構成部材10は例えば鋼製で円盤状を呈し、その中央部には緊張材3を挿通させると共に、係合解除維持部材6を摺動させるための貫通孔10aが形成され、その外縁部には貫通孔10aから連続して、すなわち第1支圧部構成部材10の内周から外周に架けて係合解除維持部材6を摺動させるための摺動溝10bが一端面に形成されている。   As shown in FIGS. 3A to 3C, the first bearing member 10 is made of, for example, steel and has a disk shape. The tension member 3 is inserted through the central portion of the first bearing member 10 and the disengagement maintaining member. A through-hole 10a for sliding 6 is formed, and the disengagement maintaining member 6 is continuously formed from the through-hole 10a on the outer edge, that is, spanning from the inner periphery to the outer periphery of the first bearing member 10. A sliding groove 10b is formed on one end surface for sliding the.

第1支圧部構成部材10は、摺動溝10bが形成された面が第2支圧部構成部材11と対面するように配置される。摺動溝10bは溝状に形成される以外に貫通して形成されてもよい。すなわち、第1支圧部構成部材10がその周方向に分割して構成されていてもよい。   The first bearing member 10 is arranged so that the surface on which the sliding groove 10 b is formed faces the second bearing member 11. The sliding groove 10b may be formed to penetrate in addition to being formed in a groove shape. That is, the 1st bearing part structural member 10 may be divided | segmented and comprised in the circumferential direction.

また、第1支圧部構成部材10には、例えばガイド12に固定するためのボルト(図示せず)が挿入する挿入孔10cが周方向に複数個(図において6つ)貫通して、摺動溝10bが形成されている面に第2支圧部構成部材11に固定されるためのボルト(図示せず)が螺合する第2支圧部構成部材螺合穴10dが周方向に複数個(図において4つ)、摺動溝10bが形成されている面と反対の面に定着ブロック8に固定されるためのボルト(図示せず)が螺合する定着ブロック螺合穴10eが周方向に複数個(図において2つ)形成されている。   In addition, a plurality of insertion holes 10c (for example, six in the drawing) through which bolts (not shown) for fixing to the guide 12 are inserted pass through the first bearing member 10 in the circumferential direction, for example. There are a plurality of second supporting member constituting member screwing holes 10d in the circumferential direction in which bolts (not shown) to be fixed to the second supporting member constituting member 11 are screwed onto the surface on which the moving groove 10b is formed. A fixing block screw hole 10e into which a bolt (not shown) for fixing to the fixing block 8 is screwed to the surface (four in the figure) opposite to the surface on which the sliding groove 10b is formed. A plurality (two in the figure) are formed in the direction.

第2支圧部構成部材螺合穴10dと定着ブロック螺合穴10eが第1支圧部構成部材10の軸方向に連続して形成されていてもよく、その場合、第2支圧部構成部材11に固定されるためのボルトと定着ブロック8に固定されるためのボルトが同一であることが望ましい。   The second support member constituting member screwing hole 10d and the fixing block screwing hole 10e may be formed continuously in the axial direction of the first support member forming member 10, and in that case, the second support member forming structure It is desirable that the bolt for fixing to the member 11 and the bolt for fixing to the fixing block 8 are the same.

図4(a)〜(c)に示すように、第2支圧部構成部材11は例えば円形を呈する鋼板である。第2支圧部構成部材11の中央部には緊張材3の各線材3aを線材3a毎に挿通させる挿通孔11aが形成されている。挿通孔11aは緊張材3が複数本で構成される場合には線材3aの配列に合わせて配設される。   As shown in FIGS. 4A to 4C, the second bearing member 11 is, for example, a circular steel plate. An insertion hole 11a for inserting each wire 3a of the tension material 3 into each wire 3a is formed in the central portion of the second bearing member 11. The insertion hole 11a is arrange | positioned according to the arrangement | sequence of the wire 3a, when the tension | tensile_strength material 3 is comprised with multiple pieces.

また、第2支圧部構成部材11には、例えばガイド12に固定するためのボルト(図示せず)が挿入するガイド挿入孔11bが周方向に複数個(図において4つ)、第1支圧部構成部材10と固定するためのボルト(図示せず)が挿入する第1支圧部構成部材挿入孔11cが周方向に複数個(図において6つ)形成されている。第1支圧部構成部材と第2支圧部構成部材が固定された際に、挿入孔10cとガイド挿入孔11bが連通する。   In addition, the second supporting pressure member constituting member 11 includes a plurality of guide insertion holes 11b (four in the drawing) in the circumferential direction, for example, into which bolts (not shown) for fixing to the guide 12 are inserted. A plurality (six in the figure) of first support pressure member constituting member insertion holes 11c into which bolts (not shown) for fixing to the pressure member constituting member 10 are inserted are formed. The insertion hole 10c and the guide insertion hole 11b communicate with each other when the first and second bearing member constituting members are fixed.

図1に示すように、係合解除維持部材6は例えば、緊張材3の軸線方向に摺動自在でウェッジ9に当接してウェッジ9が定着ブロック8に近づく向きに移動しないようにウェッジ9を係止し、ウェッジ9に付与される反力を負担する反力負担部材6Aと、その反力を支持する支持部材6Bからなる。   As shown in FIG. 1, the disengagement maintaining member 6 is, for example, slidable in the axial direction of the tension member 3 and abuts against the wedge 9 so that the wedge 9 does not move in a direction approaching the fixing block 8. It consists of a reaction force bearing member 6A that locks and bears a reaction force applied to the wedge 9, and a support member 6B that supports the reaction force.

反力負担部材6Aは複数個の硬質ゴム製のリリースチューブ13と、1個の鋼製のリリースチューブ押さえ部材14とからなる。リリースチューブ13とリリースチューブ押さえ部材14は独立して形成され、それぞれ緊張材3が挿通している。本実施の形態のように緊張材3が複数本の線材3aで構成されている場合、1本の線材3aに対して1つのリリースチューブ13が配設されている。   The reaction force bearing member 6 </ b> A includes a plurality of hard rubber release tubes 13 and a single steel release tube pressing member 14. The release tube 13 and the release tube pressing member 14 are formed independently, and the tension material 3 is inserted through each of them. When the tendon 3 is composed of a plurality of wires 3a as in the present embodiment, one release tube 13 is provided for one wire 3a.

また、反力負担部材6Aはリリースチューブ13とリリースチューブ押さえ部材14が別個に設けられて構成されている必要はなく、例えばリリースチューブ13が鋼製で、リリースリリースチューブ押さえ部材14に固定されて一体化された構成でもよい。   Further, the reaction force bearing member 6A does not need to be configured with the release tube 13 and the release tube pressing member 14 provided separately. For example, the release tube 13 is made of steel and is fixed to the release release tube pressing member 14. An integrated configuration may be used.

リリースチューブ押さえ部材14は定着ブロック8と構造体2との間で支圧部5の内部を緊張材3の軸線方向に摺動自在に配置され、第1支圧部構成部材10の摺動溝10bから外部に突出している。リリースチューブ13は線材3a上でウェッジ9とリリースチューブ押さえ部材14との間に線材3aの軸線方向に摺動自在に配置され、定着ブロック8の構造体2側の端面から挿通孔8aに挿入した状態でリリースチューブ押さえ部材14に係止している。   The release tube pressing member 14 is slidably disposed in the axial direction of the tension member 3 between the fixing block 8 and the structure 2 in the axial direction of the tension member 3. Projecting outward from 10b. The release tube 13 is slidably disposed in the axial direction of the wire 3a between the wedge 9 and the release tube pressing member 14 on the wire 3a, and is inserted into the insertion hole 8a from the end surface of the fixing block 8 on the structure 2 side. The release tube holding member 14 is locked in the state.

図5(a)、(b)に示すように、リリースチューブ押さえ部材14には支圧部5に嵌入した状態で摺動溝10bから支圧部5の外部に突出する突出部14aが形成されている。突出部14aはリリースチューブ押さえ部材14の周方向に等間隔をおいて複数個(図において4個)形成されている。突出部14aの支圧部5の側面から突出する部分には、側面に雄螺子部15aが形成された支持部材6Bに螺合する雌螺子部14bが貫通して形成されている。   As shown in FIGS. 5A and 5B, the release tube pressing member 14 is formed with a protruding portion 14 a that protrudes from the sliding groove 10 b to the outside of the supporting pressure portion 5 while being fitted in the supporting pressure portion 5. ing. A plurality of protrusions 14 a (four in the figure) are formed at equal intervals in the circumferential direction of the release tube pressing member 14. A portion of the protruding portion 14a that protrudes from the side surface of the pressure bearing portion 5 is formed with a female screw portion 14b that is threadedly engaged with a support member 6B having a male screw portion 15a formed on the side surface.

図6(a)、(b)に示すように、リリースチューブ13は緊張材3の線材3aを挿通させ得る筒状を呈する。リリースチューブ13は、一端部に形成され、定着ブロック8に係止する係止部13aと、定着ブロック8の挿通孔8aに挿入可能な挿入部13bとからなる。挿入部13bの長さは、図1に示すように、リリースチューブ13が最も構造体2に接近し、且つウェッジ9が定着ブロック8に係合した状態で挿通孔8aに挿入可能な長さである。   As shown in FIGS. 6A and 6B, the release tube 13 has a cylindrical shape through which the wire 3a of the tendon 3 can be inserted. The release tube 13 is formed at one end, and includes a locking portion 13 a that locks the fixing block 8 and an insertion portion 13 b that can be inserted into the insertion hole 8 a of the fixing block 8. As shown in FIG. 1, the length of the insertion portion 13b is such that the release tube 13 can be inserted into the insertion hole 8a with the release tube 13 closest to the structure 2 and the wedge 9 engaged with the fixing block 8. is there.

また、挿入部13bの長さは、図9又は図10に示すように、リリースチューブ13が最も構造体2から隔離された状態で、つまり係止部13aが定着ブロック8に係止する状態で、ウェッジ9の定着ブロック8への係合が解除された状態を維持させることが可能な長さである。   Further, as shown in FIG. 9 or FIG. 10, the length of the insertion portion 13b is such that the release tube 13 is most isolated from the structure 2, that is, the locking portion 13a is locked to the fixing block 8. The length is such that the state in which the wedge 9 is disengaged from the fixing block 8 can be maintained.

図1に示すように、リリースチューブ押さえ部材14の雌螺子部14bにはリリースチューブ13を緊張材3の軸線方向に摺動させるための支持部材6Bが設置されている。支持部材6Bには雌螺子部14bに螺合する雄螺子部15aが形成されており、雄螺子部15aの長さはリリースチューブ押さえ部材14の摺動可能な距離と、構造体2とリリースチューブ押さえ部材14との最も接近した距離との総和以上である。したがって、支持部材15が構造体2に当接した状態でリリースチューブ押さえ部材14に対して進む向きに回転するとリリースチューブ押さえ部材14が構造体2から遠ざかる向きに摺動し、係止部13aが定着ブロック8に係止する。   As shown in FIG. 1, a support member 6 </ b> B for sliding the release tube 13 in the axial direction of the tension member 3 is installed on the female screw portion 14 b of the release tube pressing member 14. The support member 6B is formed with a male screw portion 15a that is screwed into the female screw portion 14b. The length of the male screw portion 15a is the distance that the release tube pressing member 14 can slide, the structure 2 and the release tube. It is equal to or greater than the sum of the closest distance to the pressing member 14. Therefore, when the support member 15 is rotated in a direction to advance with respect to the release tube pressing member 14 in a state where the support member 15 is in contact with the structure 2, the release tube pressing member 14 slides in a direction away from the structure 2, and the locking portion 13a is moved. Lock to the fixing block 8.

図1に示すように、再定着補助部7は、緊張力が導入されている緊張材3が挿通しているウェッジ9を定着ブロック8に近づく向きへ移動させ、ウェッジ9を定着ブロック8と係合させるように誘導する係合誘導部材16と係合誘導部材16を定着ブロック8の軸方向に摺動させる摺動手段17とからなる。   As shown in FIG. 1, the re-fixing auxiliary unit 7 moves the wedge 9 through which the tension material 3 into which the tension is introduced is inserted in a direction approaching the fixing block 8, and engages the wedge 9 with the fixing block 8. The engagement guide member 16 is guided so as to be combined, and the sliding means 17 is configured to slide the engagement guide member 16 in the axial direction of the fixing block 8.

緊張材3が挿通する係合誘導部材16はウェッジ9を挟んで定着ブロック8と対向するように定着部4の軸方向に摺動自在に配置され、定着ブロック8に螺合している摺動手段17に挿通された状態で係止し、伝達部材18が係合誘導部材16の回りで定着ブロック8に固定し、高さ調整部材19が伝達部材18に直列に接続して構成されている。   The engagement guide member 16 through which the tension material 3 is inserted is slidably disposed in the axial direction of the fixing unit 4 so as to face the fixing block 8 with the wedge 9 interposed therebetween, and is slidably engaged with the fixing block 8. The transmission member 18 is fixed to the fixing block 8 around the engagement guide member 16, and the height adjustment member 19 is connected in series to the transmission member 18. .

係合誘導部材16とウェッジ8との間には、後述するように緊張材3が緊張されて更に伸長した際にウェッジ9が緊張力導入装置20側へ移動して定着が解除されるに足るだけの空間が形成されている。   Between the engagement guide member 16 and the wedge 8, as will be described later, when the tension member 3 is tensioned and further expanded, the wedge 9 is moved to the tension force introducing device 20 side and the fixing is released. Only a space is formed.

図7(a)、(b)に示すように、係合誘導部材16は例えば鋼製で略円盤状を呈し、その中央部には緊張材3を構成する線材3aを線材3a毎に挿通させる挿通孔16aが形成されている。また、係合誘導部材16の挿通孔16aが形成されている部分より外側には、係合誘導部材16を定着ブロック8に対して摺動させるための摺動手段17を挿入させる挿入孔16bが形成されている。   As shown in FIGS. 7A and 7B, the engagement guiding member 16 is made of, for example, steel and has a substantially disk shape, and a wire rod 3a constituting the tension member 3 is inserted into the central portion of each wire rod 3a. An insertion hole 16a is formed. Further, an insertion hole 16b for inserting a sliding means 17 for sliding the engagement guiding member 16 with respect to the fixing block 8 is provided outside the portion where the insertion hole 16a of the engagement guiding member 16 is formed. Is formed.

摺動手段17は例えばボルトからなり、上述したように例えば定着ブロック8の摺動手段螺合穴8dに螺合する。したがって、摺動手段17が摺動手段螺合穴8dに螺合しながら摺動手段17が進む向きに回転されると摺動手段17は摺動手段螺合穴8dの奥に進むので、摺動手段17と共に係合誘導部材16も同一の向きに摺動する。すなわち、係合誘導部材16が定着ブロック8に接近するように摺動する。   The sliding means 17 is made of, for example, a bolt, and is screwed into the sliding means screwing hole 8d of the fixing block 8 as described above. Accordingly, when the sliding means 17 is rotated in the direction in which the sliding means 17 advances while being screwed into the sliding means screwing hole 8d, the sliding means 17 advances to the back of the sliding means screwing hole 8d. The engagement guiding member 16 slides in the same direction together with the moving means 17. That is, the engagement guiding member 16 slides so as to approach the fixing block 8.

摺動手段17の長さは、摺動手段17が摺動手段螺合穴8dに螺合した状態で、上述したようにウェッジ9と定着ブロック8との係合が解除されることが可能であり、且つ係合誘導部材16を摺動させてウェッジ9を定着ブロック8の挿通孔8aに押し込んで緊張材3を定着させることが可能な長さである。   The length of the sliding means 17 is such that the engagement between the wedge 9 and the fixing block 8 can be released as described above in a state where the sliding means 17 is screwed into the sliding means screwing hole 8d. In addition, the engagement guide member 16 is slid and the wedge 9 is pushed into the insertion hole 8 a of the fixing block 8 to fix the tension material 3.

伝達部材18は周方向に複数個(例えば2個)の伝達部材構成材18aに分割され、伝達部材構成材18aは周方向に均等に間隔をおくように配置されている。ここで、図1に示すように周方向に隣接する伝達部材構成材18aと高さ調整部材19とで、摺動手段17を回転するための、又はウェッジ9の状況を確認するための確認窓18bが形成されている。   The transmission member 18 is divided into a plurality of (for example, two) transmission member constituent members 18a in the circumferential direction, and the transmission member constituent members 18a are arranged so as to be evenly spaced in the circumferential direction. Here, as shown in FIG. 1, a confirmation window for rotating the sliding means 17 or confirming the state of the wedge 9 with the transmission member constituting member 18 a and the height adjusting member 19 adjacent in the circumferential direction. 18b is formed.

後述するように、高さ調整部材19の伝達部材18に当接する面と反対側の面には緊張力導入装置20が当接して、緊張材3に緊張力が導入される。伝達部材18と高さ調整部材19によって定着部4に緊張力が負担され、高さ調整部材19はその肉厚によって緊張力導入装置20と緊張力解放装置1との設置状態を調整するためのものである。   As will be described later, the tension force introducing device 20 abuts on the surface of the height adjusting member 19 opposite to the surface abutting on the transmission member 18, and the tension force is introduced into the tension member 3. Tension force is borne by the fixing unit 4 by the transmission member 18 and the height adjustment member 19, and the height adjustment member 19 is for adjusting the installation state of the tension force introduction device 20 and the tension force release device 1 according to the thickness thereof. Is.

次に、緊張力解放装置1を用いた緊張材3の緊張力解放方法について説明する。ここで、緊張材3は上述したように、構造体2に固定されている定着ブロック8に係合しているウェッジ9に狭持されて構造体2に定着している。また、リリースチューブ押さえ部材14は第2支圧部構成部材11に当接し、リリースチューブ13はリリースチューブ押さえ部材14とウェッジ9の間に介在してリリースチューブ13とウェッジ9に当接している。   Next, the tension release method of the tension material 3 using the tension release apparatus 1 will be described. Here, as described above, the tension member 3 is fixed to the structure 2 by being held by the wedge 9 engaged with the fixing block 8 fixed to the structure 2. Further, the release tube pressing member 14 is in contact with the second bearing member 11, and the release tube 13 is interposed between the release tube pressing member 14 and the wedge 9 and is in contact with the release tube 13 and the wedge 9.

最初に、ジャッキ等の緊張力導入装置20を高さ調整部材19に当接した状態で緊張力解放装置1及び緊張材3に設置して緊張材3を引っ張り、図8に示すように緊張材3を伸長させると共に、ウェッジ9を緊張材3の軸線方向に対して構造体2から遠ざかる向きに移動させて、ウェッジ9と定着ブロック8との係合、すなわち緊張材3の定着を解除する(係合解除工程)。   First, the tension introducing device 20 such as a jack is placed on the tension releasing device 1 and the tension member 3 in contact with the height adjusting member 19, and the tension member 3 is pulled. As shown in FIG. 3 is extended, and the wedge 9 is moved away from the structure 2 with respect to the axial direction of the tension material 3 to release the engagement between the wedge 9 and the fixing block 8, that is, the fixation of the tension material 3 ( Disengagement step).

次いで、図9に示すように支持部材6Bを支持部材6Bが構造体2に接近する向きに回して支持部材6Bを構造体2に当接させ、さらに支持部材6Bを同一方向に回し続けてリリースチューブ押さえ部材14を構造体2から緊張材3の軸線方向に対して遠ざかる方向に移動させる(係合解除維持工程)。支持部材6Bを構造体2に当接させる作業はリリースチューブ押さえ部材14の移動後に限るものではなく、緊張力導入装置20の設置前に予め行っていても構わない。   Next, as shown in FIG. 9, the support member 6B is rotated in the direction in which the support member 6B approaches the structure 2 to bring the support member 6B into contact with the structure 2, and the support member 6B is continuously rotated in the same direction and released. The tube pressing member 14 is moved away from the structure 2 in the direction away from the axial direction of the tendon 3 (disengagement maintaining step). The operation of bringing the support member 6B into contact with the structure 2 is not limited to the movement of the release tube pressing member 14, and may be performed in advance before the tension force introducing device 20 is installed.

この時、リリースチューブ13はリリースチューブ押さえ部材14に当接しているので、リリースチューブ押さえ部材14と共に緊張材3の軸線方向に対して構造体2から遠ざかる向きに移動し、定着ブロック8の挿通孔8aの中を緊張材3の線材3aに沿って摺動する。リリースチューブ13の緊張力導入装置20側の先端は、ウェッジ9が移動する前のウェッジ9の構造体2側の先端より緊張力導入装置20側に位置している。   At this time, since the release tube 13 is in contact with the release tube pressing member 14, it moves together with the release tube pressing member 14 in a direction away from the structure 2 with respect to the axial direction of the tension member 3, and the insertion hole of the fixing block 8 It slides in the inside of 8a along the wire 3a of the tension material 3. FIG. The distal end of the release tube 13 on the tension force introducing device 20 side is positioned closer to the tension force introducing device 20 than the distal end on the structure 2 side of the wedge 9 before the wedge 9 moves.

また、ウェッジ9は緊張材3の線材3aが挿通しているので緊張材3の軸線方向に位置すると同時に、反力負担部材6Aと同一線上に位置する。したがって、ウェッジ9は反力負担部材6Aから緊張材3の軸線方向に係止され、定着ブロック8に近づく向きへの移動が阻止される。この結果、緊張材3が複数本の線材3aで構成され、線材3aが格子状に配置されても、内側に配置されている線材3aが確実に定着ブロック8との係合解除される。   In addition, since the wire 9a of the tendon 3 is inserted, the wedge 9 is located in the axial direction of the tendon 3 and at the same line as the reaction force bearing member 6A. Therefore, the wedge 9 is locked from the reaction force bearing member 6 </ b> A in the axial direction of the tension member 3, and is prevented from moving in a direction approaching the fixing block 8. As a result, even if the tension member 3 is composed of a plurality of wire rods 3 a and the wire rods 3 a are arranged in a lattice shape, the wire rods 3 a arranged on the inner side are reliably released from the fixing block 8.

次いで、図10に示すように緊張力導入装置20の引張力を減少させながら緊張力導入装置20のジャッキストロークを減縮して、緊張材3の延びを戻す(緊張力解放工程)。この途中、緊張材3を狭持しているウェッジ9が構造体2側へ移動し、緊張力導入装置20側に移動したリリースチューブ13に当接する。リリースチューブ13の係止部13aがリリースチューブ押さえ部材14に係止し、リリースチューブ押さえ部材14は構造体2に当接している支持部材6Bと螺合しているので、ウェッジ9がリリースチューブ13に係止する。   Next, as shown in FIG. 10, the jack stroke of the tension force introducing device 20 is reduced while reducing the tensile force of the tension force introducing device 20, and the extension of the tension material 3 is returned (tensile force releasing step). In the middle of this, the wedge 9 holding the tension material 3 moves to the structure 2 side and contacts the release tube 13 moved to the tension force introducing device 20 side. Since the locking portion 13 a of the release tube 13 is locked to the release tube pressing member 14, and the release tube pressing member 14 is screwed with the support member 6 B that is in contact with the structure 2, the wedge 9 is connected to the release tube 13. Lock to.

したがって、ウェッジ9がリリースチューブ13に係止した後は、緊張力導入装置20のジャッキストロークを更に減縮して緊張材3の延びを更に戻しても、ウェッジ9が定着ブロック8の挿通孔8aに差し込まれて緊張材3が再度ウェッジ9に狭持されて再定着することはなく、緊張材3の緊張力が解放される。緊張力解放工程前の緊張材3の延び量に比して、緊張材3に設置後のジャッキストロークの縮減能力の方が大きければ、緊張材3の緊張力は完全に解放される。   Therefore, after the wedge 9 is locked to the release tube 13, the wedge 9 can be inserted into the insertion hole 8 a of the fixing block 8 even if the jack stroke of the tension introducing device 20 is further reduced and the extension of the tension member 3 is further returned. The tension material 3 is not inserted into the wedge 9 again and fixed again, and the tension force of the tension material 3 is released. If the ability to reduce the jack stroke after installation on the tensioning material 3 is larger than the extension amount of the tensioning material 3 before the tension release process, the tensioning force of the tensioning material 3 is completely released.

ここで、緊張材3の延び量に対して緊張材3に設置後のジャッキストロークの縮減能力の方が小さければ、盛り替え作業が必要になる。つまり、緊張力導入装置20の限界まで緊張材3の延びを戻しても、緊張材3に緊張力が残存している場合、図11に示すように支持部材6Bを支持部材6Bが構造体2から遠ざかる向きに回してリリースチューブ押さえ部材14を構造体2に接近する向きに移動させる(係合解除維持解除工程)。   Here, if the reduction capability of the jack stroke after installation in the tensioning material 3 is smaller than the extension amount of the tensioning material 3, a replacement work is required. That is, even if the extension of the tension material 3 is returned to the limit of the tension force introducing device 20, if the tension force remains in the tension material 3, the support member 6B is replaced by the structure 2 as shown in FIG. The release tube presser member 14 is moved in a direction approaching the structure 2 by turning in a direction away from (disengagement maintenance release step).

次いで、図12に示すように摺動手段17を摺動手段17が定着ブロック8に対して接近する向きに回して、係合誘導部材16をウェッジ9の緊張力導入装置20側から定着ブロック8に接近する向きに移動させ、ウェッジ9を定着ブロック8の挿通孔8aに誘導して定着ブロック8に係合させ、緊張材3をウェッジ9で狭持させて再定着させる(再係合工程)。この時、リリースチューブ13はウェッジ9を介して係合誘導部材16に押されて構造体2側へ移動する。   Next, as shown in FIG. 12, the sliding means 17 is rotated in the direction in which the sliding means 17 approaches the fixing block 8, and the engagement guiding member 16 is moved from the tension force introducing device 20 side of the wedge 9 to the fixing block 8. The wedge 9 is guided to the insertion hole 8a of the fixing block 8 and engaged with the fixing block 8, and the tension material 3 is held by the wedge 9 to be re-fixed (re-engagement step). . At this time, the release tube 13 is pushed by the engagement guide member 16 through the wedge 9 and moves to the structure 2 side.

ここで、例えばハンマー等で緊張材3を叩いて緊張材3が確実に定着していることが確認窓18bから確認できたら、摺動手段17を摺動手段17が定着ブロック8に対して遠ざかる向きに回して、係合誘導部材16を定着ブロック8に対して遠ざける向きに移動して、緊張材3に緊張力導入装置20を設置する。緊張材3が確実に緊張していることを確認する手段はハンマー等で叩く方法の他に、例えば係合誘導部材16が定着ブロック8から遠ざかった際に確認窓18bからウェッジ9を目視する方法等があり、また、これらに限られない。   Here, for example, when it is confirmed from the confirmation window 18 b that the tension material 3 is firmly fixed by hitting the tension material 3 with a hammer or the like, the sliding means 17 is moved away from the fixing block 8. By turning in the direction, the engagement guiding member 16 is moved away from the fixing block 8, and the tension introducing device 20 is installed on the tension member 3. The means for confirming that the tension material 3 is surely tensed is not only a method of hitting with a hammer or the like, but also a method of visually observing the wedge 9 from the confirmation window 18b when the engagement guiding member 16 moves away from the fixing block 8, for example. Etc., and is not limited to these.

緊張材3の緊張力が一度解放されると、緊張材3の緊張力が完全に解放されるまで、再係合工程、係合解除工程、係合解除維持工程及び緊張力解放工程を繰り返す。緊張材3の緊張力が完全に解放されると、緊張力導入装置20、緊張力解放装置1及び緊張材3を撤去する。緊張力解放装置1は転用・再利用することができるので、経済性が高い。   Once the tension force of the tension member 3 is released, the re-engagement step, the disengagement step, the disengagement maintaining step, and the tension force release step are repeated until the tension force of the tension member 3 is completely released. When the tension force of the tension material 3 is completely released, the tension force introducing device 20, the tension force releasing device 1, and the tension material 3 are removed. Since the tension releasing device 1 can be diverted and reused, it is highly economical.

(実施の形態2)
次に、他の実施の形態である緊張力解放装置21について説明する。だだし、実施の形態1と共通する部分については、同一の名称・符号を用い、説明を省略する。
(Embodiment 2)
Next, the tension release apparatus 21 which is other embodiment is demonstrated. However, the same names and symbols are used for portions common to the first embodiment, and description thereof is omitted.

図13に示すように、本発明の構成例の1つである緊張力解放装置21は、緊張力導入装置20の反力となる公知の緊張力解放用チェアに組み込まれた構造を成し、定着具22に被せ、緊張力導入装置を支持する状態で緊張力導入装置20と定着具22の間に配置されている。当初、つまり緊張力解放装置21及び緊張力導入装置20が設置される前、緊張材3は定着具22によって構造体2に定着している。   As shown in FIG. 13, the tension release device 21 which is one of the configuration examples of the present invention has a structure incorporated in a known tension release chair which is a reaction force of the tension introduction device 20. It is placed between the tension force introducing device 20 and the fixing tool 22 so as to cover the fixing tool 22 and support the tension force introducing device. At first, that is, before the tension release device 21 and the tension introduction device 20 are installed, the tension material 3 is fixed to the structure 2 by the fixing tool 22.

具体的には、緊張材3の線材3aが挿通している雄型コーン22aが構造体2と一体化しているガイド22bに固定された支圧板22cに固定されている雌型コーン22dに差し込まれて、緊張材3が構造体2に定着している。   Specifically, the male cone 22a through which the wire 3a of the tension member 3 is inserted is inserted into the female cone 22d fixed to the bearing plate 22c fixed to the guide 22b integrated with the structure 2. Thus, the tendon 3 is fixed to the structure 2.

図13に示すように、緊張力解放装置21は、緊張材3を構造体2に定着させ、緊張力を負担する定着部24と、定着部24に当接し、定着部24が負担する緊張力を構造体2と一体となった定着具22に伝達する支圧部25と、定着部24を構成する定着ブロック(くさび受具)28とウェッジ(くさび)29との係合が解除した状態を維持する係合解除維持部材26とからなる。   As shown in FIG. 13, the tension release device 21 fixes the tension material 3 to the structure 2, a fixing unit 24 that bears the tension, and a tension that abuts the fixing unit 24 and bears the fixing unit 24. Is a state in which the engagement between the pressure-supporting portion 25 that transmits to the fixing device 22 integrated with the structure 2, the fixing block (wedge receiver) 28 that constitutes the fixing portion 24, and the wedge 29 is released. It consists of a disengagement maintaining member 26 that maintains.

定着部24は定着ブロック28とウェッジ29からなり、引張力を受けている緊張材3が挿通している定着ブロック28に、緊張材3を挟み込んでいるウェッジ29が差し込まれて係合している。定着ブロック28は、例えばボルト(図示せず)によって支圧部25に固定され、支圧部25を介して構造体2に埋設されている定着具22に支持されている。   The fixing unit 24 includes a fixing block 28 and a wedge 29. A wedge 29 sandwiching the tension material 3 is inserted into and engaged with the fixing block 28 through which the tension material 3 receiving a tensile force is inserted. . The fixing block 28 is fixed to the supporting pressure part 25 by, for example, a bolt (not shown), and supported by the fixing tool 22 embedded in the structure 2 via the supporting pressure part 25.

図14(a)、(b)に示すように、定着ブロック28は例えば鋼製で円盤状又は円柱状を呈し、その構造は上記定着ブロック8の伝達部材螺合穴8cと摺動手段螺合穴8dが形成されていない点を除き、上記定着ブロック28と同一の構造である。   As shown in FIGS. 14 (a) and 14 (b), the fixing block 28 is made of, for example, steel and has a disk shape or a columnar shape, and its structure is screwed with the transmission member screw hole 8c of the fixing block 8 and the sliding means. The structure is the same as that of the fixing block 28 except that the hole 8d is not formed.

図13に示すように、支圧部25は第1支圧部構成部材30と第2支圧部構成部材31からなり、第1支圧部構成部材30が第2支圧部構成部材31に直列に嵌合した状態で固定されて構成され、略円筒状を呈し、緊張材3が挿通している。また、支圧部25は緊張材3の軸線方向と両構成部材30、31が直列に接続する方向とが一致するように構造体2に配置されている。   As shown in FIG. 13, the bearing part 25 includes a first bearing part constituting member 30 and a second bearing part constituting member 31, and the first bearing part constituting member 30 becomes a second bearing part constituting member 31. It is configured to be fixed in a state of being fitted in series, has a substantially cylindrical shape, and the tension material 3 is inserted therethrough. Moreover, the bearing part 25 is arrange | positioned at the structure 2 so that the axial direction of the tension material 3 and the direction where both the structural members 30 and 31 connect in series may correspond.

第2支圧部構成部材31は構造体2に一体化した定着具22に例えばボルトからなる固定手段35で固定され、第1支圧部構成部材30は係合解除維持部26のリリースチューブ押さえ部材33に支圧部25の軸線方向に摺動自在に嵌入された状態で定着ブロック28に固定されている。   The second support member 31 is fixed to the fixing device 22 integrated with the structure 2 by fixing means 35 such as a bolt, and the first support member 30 is a release tube presser of the disengagement maintaining unit 26. The member 33 is fixed to the fixing block 28 in a state of being slidably fitted in the axial direction of the pressure bearing portion 25.

図15(a)〜(c)に示すように、第1支圧部構成部材30は例えば鋼製で略円筒状を呈し、その中央部には緊張材3を挿通させると共に、反力負担部材26Aを摺動させるための貫通孔30aが形成され、その外縁部には貫通孔30aから連続して、すなわち第1支圧部構成部材30の内周から外周に架けて反力負担部材26Aを摺動させるための摺動溝30bが一端面から形成されている。   As shown in FIGS. 15A to 15C, the first bearing member 30 is made of, for example, steel and has a substantially cylindrical shape. The tension member 3 is inserted through the center of the first bearing member 30 and the reaction force bearing member. A through hole 30a for sliding 26A is formed, and a reaction force bearing member 26A is formed on the outer edge thereof continuously from the through hole 30a, that is, from the inner periphery to the outer periphery of the first bearing member 30. A sliding groove 30b for sliding is formed from one end face.

また、第1支圧部構成部材30の摺動溝30bが形成されている面には、定着ブロック28が嵌合する嵌合溝30cが形成されている。嵌合溝30cには定着ブロック28を固定させるるためのボルト(図示せず)が螺合する螺合穴30dが例えば第1支圧部構成部材30の周方向に複数個(図において4つ)形成されている。   In addition, a fitting groove 30c into which the fixing block 28 is fitted is formed on the surface of the first bearing member 30 where the sliding groove 30b is formed. In the fitting groove 30c, a plurality of screw holes 30d (for example, four in the figure) are provided in the circumferential direction of the first bearing member 30, for example, in which bolts (not shown) for fixing the fixing block 28 are screwed. ) Is formed.

図16(a)〜(c)に示すように、第2支圧部構成部材31は例えば鋼製で略円筒状を呈している。第2支圧部鋼製部材31の側壁には主に定着具22を観察するための観察窓31cが形成されている。また、第2支圧部構成部材31には、例えば定着具22に固定するためのボルトが螺合する螺合孔31aが形成されている。さらに、後述する支持部材26Bを回動自在に装着させるための装着孔31bが形成されている。   As shown in FIGS. 16A to 16C, the second bearing member 31 is made of, for example, steel and has a substantially cylindrical shape. An observation window 31 c for mainly observing the fixing tool 22 is formed on the side wall of the second bearing member steel member 31. Further, the second support pressure member constituting member 31 is formed with a screwing hole 31 a into which a bolt for fixing to the fixing tool 22 is screwed, for example. Furthermore, a mounting hole 31b for rotatably mounting a support member 26B described later is formed.

図13に示すように、係合解除維持部26は例えば、緊張材3の軸線方向に摺動自在でウェッジ29に当接してウェッジ29が定着ブロック28に近づく向きに移動しないようにウェッジ29を係止し、ウェッジ29に付与される反力を負担する反力負担部材26Aと、その反力を支持する支持部材26Bからなる。   As shown in FIG. 13, for example, the disengagement maintaining unit 26 is slidable in the axial direction of the tendon 3 and abuts against the wedge 29 so that the wedge 29 does not move toward the fixing block 28. It consists of a reaction force bearing member 26A that locks and bears a reaction force applied to the wedge 29, and a support member 26B that supports the reaction force.

反力負担部材26Aは複数個の硬質ゴム製のリリースチューブ33と、1個の鋼製のリリースチューブ押さえ部材34とからなる。リリースチューブ33とリリースチューブ押さえ部材34は独立して形成され、それぞれ緊張材3が挿通している。本実施の形態のように緊張材3が複数本の線材3aで構成されている場合、1本の線材3aに対して1つのリリースチューブ33が配設されている。   The reaction force bearing member 26 </ b> A includes a plurality of hard rubber release tubes 33 and a single steel release tube pressing member 34. The release tube 33 and the release tube pressing member 34 are formed independently, and the tendon 3 is inserted through each of them. When the tendon 3 is composed of a plurality of wires 3a as in the present embodiment, one release tube 33 is provided for one wire 3a.

また、反力負担部材26Aはリリースチューブ33とリリースチューブ押さえ部材34が別個に設けられて構成されている必要はなく、リリースチューブ33が鋼製で、リリースリリースチューブ押さえ部材34に固定されて一体化された構成でもよい。   Further, the reaction force bearing member 26A does not have to be configured by separately providing the release tube 33 and the release tube pressing member 34, and the release tube 33 is made of steel and is fixed to the release release tube pressing member 34 so as to be integrated. It may be a structured.

リリースチューブ押さえ部材34は定着ブロック28と構造体2との間で支圧部25の内部を緊張材3の軸線方向に摺動自在に配置され、第1支圧部構成部材30の摺動溝30bから外部に突出している。リリースチューブ33は線材3a上のウェッジ29の構造体2側でリリースチューブ押さえ部材34に嵌合した状態で係止し、リリースチューブ押さえ部材34と一体化している。また、リリースチューブ33は最も構造体2側に配置された状態においても、定着ブロック28に挿入している。   The release tube pressing member 34 is disposed between the fixing block 28 and the structure 2 so as to be slidable in the axial direction of the tension member 3 between the pressure supporting portion 25 and the sliding groove of the first pressure supporting portion constituting member 30. Projecting outward from 30b. The release tube 33 is engaged with the release tube pressing member 34 at the structure 2 side of the wedge 29 on the wire 3 a and is integrated with the release tube pressing member 34. Further, the release tube 33 is inserted into the fixing block 28 even in the state where it is disposed closest to the structure 2 side.

また、支持部材26Bはリリースチューブ押さえ部材34の支圧部25から突出している突出部34aの構造体2側で第2支圧部構成部材31に設置されている。   Further, the support member 26 </ b> B is installed on the second pressure-supporting portion constituting member 31 on the structure 2 side of the protruding portion 34 a that protrudes from the pressure-supporting portion 25 of the release tube pressing member 34.

図17(a)、(b)に示すように、リリースチューブ押さえ部材34には支圧部25に嵌入した状態で摺動溝30bから支圧部25の外部に突出する突出部34aが形成されている。突出部34aはリリースチューブ押さえ部材34の周方向に等間隔をおいて複数個(図において2個)形成されている。   As shown in FIGS. 17A and 17B, the release tube pressing member 34 is formed with a protruding portion 34 a that protrudes from the sliding groove 30 b to the outside of the supporting pressure portion 25 in a state of being fitted into the supporting pressure portion 25. ing. A plurality of protrusions 34 a (two in the figure) are formed at equal intervals in the circumferential direction of the release tube pressing member 34.

図18(a)、(b)に示すように、支持部材26Bは例えばボルト37aとナット(図示せず)からなる1組の締結部材で構成される軸部37と、リリースチューブ押さえ部材34に当接して移動させることが可能な作用部38と、作用部38に連結して支持部材26Bを操作するための操作部39とからなる。   As shown in FIGS. 18A and 18B, the support member 26B includes, for example, a shaft portion 37 formed of a set of fastening members including a bolt 37a and a nut (not shown), and a release tube pressing member 34. It comprises an action portion 38 that can be moved in contact with it, and an operation portion 39 that is connected to the action portion 38 and operates the support member 26B.

軸部37のボルト37aが作用部38の外側から作用部38と第2支圧部構成部材31に挿通した状態で作用部38に当接し、ナットが第2支圧部構成部材31の内側から締め付けられることによって、支持部材26Bは第2支圧部構成部材31に装着されている。作用部38は軸部37を中心に回動自在であり、側面に例えば平坦部38aと平坦部38aから連設される例えば半円状の曲面部38bとが形成されている。   The bolt 37a of the shaft portion 37 abuts against the action portion 38 in a state where the bolt 37a is inserted from the outside of the action portion 38 into the action portion 38 and the second support pressure member constituting member 31, and the nut comes from the inside of the second support pressure portion constituting member 31. By being tightened, the support member 26 </ b> B is attached to the second bearing member 31. The action portion 38 is rotatable about the shaft portion 37, and a flat portion 38a and a semicircular curved surface portion 38b, for example, are provided on the side surface.

支持部材26Bは、図13に示すように突出部34aと平坦部38aとが対向するように配置され、支持部材26Bが回動した際に曲面部38bが突出部34aに当接しながらリリースチューブ押さえ部材34が構造体2から遠ざかる向きに摺動するように構成されている。支持部材26Bは突出部34aに一対に設けられていることが望ましい。   As shown in FIG. 13, the support member 26B is disposed so that the protruding portion 34a and the flat portion 38a face each other. When the support member 26B is rotated, the curved surface portion 38b is in contact with the protruding portion 34a and the release tube presser is pressed. The member 34 is configured to slide in a direction away from the structure 2. It is desirable that the support member 26B is provided in a pair on the protruding portion 34a.

さらに、支持部材26Bは第2支圧部構成部材31の周方向に2つ等間隔で設置され、各々の軸部37が緊張材3の回りで緊張材3を回避するように連結されていることが望ましい。この場合、何れか1つの支持部材26Bが操作されれば両方の支持部材26Bが作動するので、作業が省力化が図れる。   Further, two support members 26 </ b> B are installed at equal intervals in the circumferential direction of the second support pressure member constituting member 31, and each shaft portion 37 is connected so as to avoid the tension material 3 around the tension material 3. It is desirable. In this case, if any one of the support members 26B is operated, both the support members 26B are operated, so that labor can be saved.

図19(a)、(b)に示すように、リリースチューブ33は緊張材3の線材3aを挿通させ得る筒状を呈し、定着ブロック28又はリリースチューブ押さえ部材34に係止する係止部33aと、定着ブロック28の挿通孔28aに挿入可能な定着ブロック挿入部33bと、リリースチューブ押さえ部材34の挿通孔34cに挿入可能なリリースチューブ押さえ部材挿入部33cとからなる。   As shown in FIGS. 19A and 19B, the release tube 33 has a cylindrical shape through which the wire 3 a of the tension member 3 can be inserted, and is engaged with the fixing block 28 or the release tube pressing member 34. A fixing block insertion portion 33b that can be inserted into the insertion hole 28a of the fixing block 28, and a release tube pressing member insertion portion 33c that can be inserted into the insertion hole 34c of the release tube pressing member 34.

定着ブロック挿入部33bの長さは、図13に示すように、リリースチューブ33が最も構造体2に接近し、且つウェッジ29が定着ブロック28に係合した状態で挿通孔28aに挿入可能な長さである。また、図20又は図21に示すように、リリースチューブ33が最も構造体2から隔離された状態で、つまり係止部33aが定着ブロック28に係止する状態で、ウェッジ29の定着ブロック28への係合が解除された状態を維持させることが可能な長さである。   As shown in FIG. 13, the fixing block insertion portion 33b is long enough to be inserted into the insertion hole 28a with the release tube 33 closest to the structure 2 and the wedge 29 engaged with the fixing block 28. That's it. Further, as shown in FIG. 20 or FIG. 21, the wedge 29 is fixed to the fixing block 28 in a state where the release tube 33 is most isolated from the structure 2, that is, in a state where the locking portion 33 a is locked to the fixing block 28. It is the length which can maintain the state from which the engagement was released.

次に、緊張力が導入され、構造体2に定着している緊張材3の緊張力解放方法について説明する。ここで、緊張材3は当初、上述したように、構造体2に固定されている定着具22に差し込まれている雄型コーン22aに狭持されて構造体2に定着している。   Next, the tension | tensile_strength release method of the tension | tensile_strength material 3 in which tension | tensile_strength was introduce | transduced and fixed to the structure 2 is demonstrated. Here, the tendon 3 is initially fixed to the structure 2 by being held by the male cone 22a inserted into the fixing tool 22 fixed to the structure 2 as described above.

最初に、緊張力解放装置21を定着具22及び緊張材3に設置し、緊張力導入装置20を緊張力解放装置21及び緊張材3に設置する。緊張力導入装置20のジャッキストロークは最大ストロークから所定長縮減された状態にするのが望ましい。この時、リリースチューブ押さえ部材34が摺動溝30bの底面に当接してリリースチューブ33及びリリースチューブ押さえ部材34が最も構造体2に接近している。また、ウェッジ29は緊張材3が挿通し、定着ブロック28に拘束されない程度に定着ブロック28の挿通孔28aに挿入している。   First, the tension release device 21 is installed on the fixing tool 22 and the tension material 3, and the tension introduction device 20 is installed on the tension release device 21 and the tension material 3. The jack stroke of the tension introducing device 20 is preferably reduced by a predetermined length from the maximum stroke. At this time, the release tube pressing member 34 comes into contact with the bottom surface of the sliding groove 30 b, and the release tube 33 and the release tube pressing member 34 are closest to the structure 2. The wedge 29 is inserted into the insertion hole 28a of the fixing block 28 to such an extent that the tendon 3 is inserted and is not restrained by the fixing block 28.

続いて、緊張力導入装置20のジャッキストロークは最大ストロークから所定長縮減されているので、図20に示すように、緊張力導入装置20によって緊張材3を引っ張って、雄型コーン22aを撤去する(係合解除工程)。ここで、緊張材3を伸長させると共に、雄型コーン22aを緊張材3の軸線方向に対して構造体2から遠ざかる向きに移動させて、雄型コーン22aと雌型コーン22dとの係合を解除する。緊張材3が伸長した分、ウェッジ29も緊張力導入装置20側に移動する。   Subsequently, since the jack stroke of the tension force introducing device 20 is reduced by a predetermined length from the maximum stroke, the tension material introducing device 20 pulls the tension material 3 to remove the male cone 22a as shown in FIG. (Disengagement step). Here, the tension material 3 is extended, and the male cone 22a is moved away from the structure 2 with respect to the axial direction of the tension material 3, thereby engaging the male cone 22a and the female cone 22d. To release. As the tension material 3 is extended, the wedge 29 is also moved to the tension force introducing device 20 side.

次いで、図21に示すように支持部材26Bの操作部39を回動して、リリースチューブ押さえ部材34を緊張材3の軸線方向に対して構造体2から遠ざける向きに移動させ、リリースチューブ33の係止部33aを定着ブロック28に係止させると同時に、リリースチューブ33を定着ブロック28の挿通孔28aに一層挿入させる(係合解除維持工程)。ここで、リリースチューブ33とウェッジ29が当接していることが望ましい。確実に定着ブロック28とウェッジ29の係合の解除が維持されるからである。   Next, as shown in FIG. 21, the operation portion 39 of the support member 26 </ b> B is rotated, and the release tube pressing member 34 is moved away from the structure 2 with respect to the axial direction of the tension member 3. At the same time that the locking portion 33a is locked to the fixing block 28, the release tube 33 is further inserted into the insertion hole 28a of the fixing block 28 (disengagement maintaining step). Here, it is desirable that the release tube 33 and the wedge 29 are in contact with each other. This is because the disengagement between the fixing block 28 and the wedge 29 is reliably maintained.

続いて、緊張力導入装置20の引張力を減少させながら緊張力導入装置20のジャッキストロークを減縮して、緊張材3の延びを戻し、緊張材3の緊張力を解放する(緊張力解放工程)。この時、リリースチューブ33の係止部33aはリリースチューブ押さえ部材34に係止し、リリースチューブ押さえ部材34が支持部材26Bに係止しているので、ウェッジ29はリリースチューブ33に係止する。   Subsequently, while reducing the tensile force of the tension force introducing device 20, the jack stroke of the tension force introducing device 20 is reduced, the extension of the tension material 3 is returned, and the tension force of the tension material 3 is released (tensile force releasing step). ). At this time, the locking portion 33a of the release tube 33 is locked to the release tube pressing member 34, and the release tube pressing member 34 is locked to the support member 26B, so that the wedge 29 is locked to the release tube 33.

したがって、ウェッジ29がリリースチューブ33に係止した後は、緊張力導入装置20のジャッキストロークを減縮して緊張材3の延びを戻しても、ウェッジ29が定着ブロック28の挿通孔28aに差し込まれて緊張材3がウェッジ29に狭持されて再定着することはなく、緊張材3の緊張力が解放される。緊張力解放工程前の緊張材3の延び量に比して、緊張材3に設置後のジャッキストロークの減縮能力の方が大きければ、緊張材3の緊張力は完全に解放される。   Therefore, after the wedge 29 is locked to the release tube 33, the wedge 29 is inserted into the insertion hole 28 a of the fixing block 28 even if the jack stroke of the tension introducing device 20 is reduced and the extension of the tension member 3 is returned. Thus, the tension material 3 is not held by the wedge 29 and re-fixed, and the tension force of the tension material 3 is released. If the ability to reduce the jack stroke after installation on the tensioning material 3 is larger than the extension amount of the tensioning material 3 before the tension releasing process, the tensioning force of the tensioning material 3 is completely released.

ここで、緊張材3の延び量に対して緊張力導入装置20のジャッキストロークの縮減能力の方が小さければ、盛り替え作業が必要となる。つまり、緊張力導入装置20の限界まで緊張材3の延びを戻しても、緊張材3に緊張力が残存している場合、図22に示すように、支持部材26Bの平坦部38aが突出部34aに対面するように支持部材26Bの操作部39を回動して、リリースチューブ押さえ部材34及びリリースチューブ33を構造体2に接近する向きに移動させる(係合解除維持解除工程)。この場合は、ジャッキストロークの縮減能力の限界より所定量長い状態でジャッキストロークの減縮を停止させる。   Here, if the reduction capability of the jack stroke of the tension force introducing device 20 is smaller than the extension amount of the tension material 3, a reordering operation is required. That is, even if the extension of the tension material 3 is returned to the limit of the tension force introducing device 20, when the tension force remains in the tension material 3, as shown in FIG. 22, the flat portion 38a of the support member 26B is a protruding portion. The operation portion 39 of the support member 26B is rotated so as to face 34a, and the release tube pressing member 34 and the release tube 33 are moved in a direction approaching the structure 2 (engagement release maintenance release step). In this case, the reduction of the jack stroke is stopped in a state longer than the limit of the jack stroke reduction capability by a predetermined amount.

また、この時、リリースチューブ33はリリースチューブ押さえ部材34の挿通孔34aに嵌合してリリースチューブ押さえ部材34と一体となっているので、リリースチューブ押さえ部材34を移動させればリリースチューブ33も確実に移動し、作業の省力化が図られる。   At this time, since the release tube 33 is fitted in the insertion hole 34a of the release tube pressing member 34 and integrated with the release tube pressing member 34, the release tube 33 is also moved by moving the release tube pressing member 34. It moves reliably and labor saving is achieved.

次いで、図23に示すようにジャッキストロークは縮減能力の限界より所定量長い状態にあるので、さらに緊張力導入装置20の引張力を減少させながら緊張材3のジャッキストロークを縮減させる(再係合工程)。この時、緊張材3の延びが戻されてウェッジ29は定着ブロック28の挿通孔28aに差し込まれ、定着ブロック28に係合するので、緊張材3はウェッジ29に狭持させて構造体2に再定着する。   Next, as shown in FIG. 23, since the jack stroke is in a state longer than the limit of the reduction capability, the jack stroke of the tension member 3 is further reduced (re-engagement) while the tensile force of the tension introduction device 20 is further reduced. Process). At this time, the extension of the tension material 3 is returned, and the wedge 29 is inserted into the insertion hole 28a of the fixing block 28 and engages with the fixing block 28. Therefore, the tension material 3 is held between the wedge 29 and the structure 2 Re-establish.

ここで、例えばハンマー等で緊張材3を叩いて緊張材3が確実に定着していることが確認できたら、緊張材3に緊張力導入装置20を設置する。緊張材3が確実に緊張していることを確認する手段はハンマー等で叩く方法に限られない。   Here, for example, when it is confirmed that the tension material 3 is firmly fixed by hitting the tension material 3 with a hammer or the like, the tension force introducing device 20 is installed on the tension material 3. Means for confirming that the tension material 3 is surely in tension is not limited to a method of hitting with a hammer or the like.

緊張材3の緊張力が一度解放されると、緊張材3の緊張力が完全に解放されるまで、再定着工程、定着解除工程、定着解除保持工程及び緊張力解放工程を繰り返す。緊張材3の緊張力が完全に解放されると、緊張力導入装置20、緊張力解放装置21及び緊張材3を撤去する。緊張力解放装置21は転用・再利用することができるので、経済性が高い。   Once the tension of the tension member 3 is released, the re-fixing step, the fixing release step, the fixing release holding step, and the tension release step are repeated until the tension of the tension member 3 is completely released. When the tension force of the tension material 3 is completely released, the tension force introducing device 20, the tension force releasing device 21, and the tension material 3 are removed. Since the tension releasing device 21 can be diverted and reused, it is highly economical.

また、本実施の形態のように緊張力解放用チェアに緊張力解放装置21が組み込まれる構造の場合、1つの緊張力導入装置20に対して1つの緊張力解放装置21が使用されるので、1つの定着具に対して1つ使用される実施の形態1の場合に比して、経済性が高い。   Further, in the case of the structure in which the tension release device 21 is incorporated in the tension release chair as in the present embodiment, one tension release device 21 is used for one tension introduction device 20. Compared to the case of the first embodiment in which one fixing device is used, the economic efficiency is high.

さらに、実施の形態1、2のように、押し出し工法によって構造体2を架設するために一時的に補強することを目的に緊張材3が仮緊張状態におかれる場合、仮緊張状態が解かれるまで一般的に1ヶ月程度要する。したがって、実施の形態1の場合、緊張力解放装置1は養生されなければその間中外部に露呈されるので、錆びて使用時に不具合が生じる蓋然性が高くなる。また、錆びて再利用できなくなる場合もある。キャップ等によって養生すれば、コストが高くなる。   Further, as in the first and second embodiments, when the tension member 3 is placed in a temporary tension state for the purpose of temporarily reinforcing the structure 2 for erection by the extrusion method, the temporary tension state is released. In general, it takes about one month. Therefore, in the case of the first embodiment, the tension releasing device 1 is exposed to the outside unless it is cured, so that there is a high probability that it will rust and cause problems during use. Moreover, it may rust and cannot be reused. If it is cured with a cap or the like, the cost increases.

しかし、本実施の形態のように緊張力解放装置が緊張力解放用チェアに組み込まれる構造である場合、緊張力解放作業時にのみ使用されるので、最低限の管理を行っていれば錆びることはない。したがって、作業に支障を来すこともなく、且つ確実に再利用することができる。   However, if the tension release device is built into the tension release chair as in this embodiment, it is used only during the tension release work, so it will rust if minimal management is performed. Absent. Therefore, the work can be reliably reused without causing any trouble.

(その他の実施の形態)
なお、本発明は、上記各実施の形態に限定されるものではない。上記実施の形態は、例示であり、本発明の特許請求の範囲に記載された技術的思想と実質的に同一な構成を有し、同様な作用効果を奏するものは、いかなるものであっても本発明の技術的範囲に包含される。
(Other embodiments)
The present invention is not limited to the above embodiments. The above-described embodiment is merely an example, and any structure having substantially the same configuration as the technical idea described in the claims of the present invention and having the same function and effect can be used. It is included in the technical scope of the present invention.

構造体に設置された緊張力解放装置を表す断面図である。It is sectional drawing showing the tension | tensile_strength release apparatus installed in the structure. (a)は図1の定着ブロックの平面図、(b)は図3(a)のA−A断面図である。FIG. 4A is a plan view of the fixing block of FIG. 1, and FIG. 4B is a cross-sectional view taken along line AA of FIG. (a)は図1の第1支圧部構成部材の平面図、(b)は図4(c)のB−B断面図、(c)は図1の第1支圧部構成部材の背面図である。(A) is a top view of the 1st bearing part constituent member of Drawing 1, (b) is a BB sectional view of Drawing 4 (c), and (c) is the back of the 1st bearing part constituent member of Drawing 1 FIG. (a)は図1の第2支圧部構成部材の平面図、(b)は図5(c)のC−C断面図、(c)は図1の第2支圧部構成部材の背面図である。(A) is a top view of the 2nd bearing part structural member of FIG. 1, (b) is CC sectional drawing of FIG.5 (c), (c) is the back of the 2nd bearing part structural member of FIG. FIG. (a)は図1のリリースチューブ押さえ部材の平面図、(b)は図6(a)のD−D断面図である。(A) is a top view of the release tube pressing member of FIG. 1, (b) is DD sectional drawing of Fig.6 (a). (a)は図1のリリースチューブの平面図、(b)は図7(a)のE−E断面図である。(A) is a top view of the release tube of FIG. 1, (b) is EE sectional drawing of Fig.7 (a). (a)は図1の係合誘導部材の平面図、(b)は図8(a)のF−F断面図である。(A) is a top view of the engagement induction | guidance | derivation member of FIG. 1, (b) is FF sectional drawing of Fig.8 (a). 係合解除工程を表す断面図である。It is sectional drawing showing an engagement cancellation | release process. 係合解除維持工程を表す断面図である。It is sectional drawing showing a disengagement maintenance process. 緊張力解放工程を表す断面図である。It is sectional drawing showing a tension force release process. 係合解除維持解除工程を表す断面図である。It is sectional drawing showing an engagement cancellation | release maintenance cancellation | release process. 再係合工程を表す断面図である。It is sectional drawing showing a re-engagement process. その他の実施の形態の構造体に設置された緊張力解放装置を表す断面図である。It is sectional drawing showing the tension release apparatus installed in the structure of other embodiment. (a)は図13の定着ブロックの平面図、(b)は図14(a)のG−G断面図である。FIG. 14A is a plan view of the fixing block of FIG. 13, and FIG. 14B is a sectional view taken along line GG of FIG. (a)は図13の第1支圧部構成部材の平面図、(b)は図15(c)のH−H断面図、(c)は図13の第1支圧部構成部材の背面図である。(A) is a top view of the 1st bearing part constituent member of Drawing 13, (b) is a HH sectional view of Drawing 15 (c), and (c) is the back of the 1st bearing part constituent member of Drawing 13 FIG. (a)は図13の第2支圧部構成部材の平面図、(b)は図16(a)のI−I断面図、(c)は図16(a)のJ−J断面図である。(A) is a plan view of the second bearing part component member of FIG. 13, (b) is a cross-sectional view taken along line II of FIG. 16 (a), and (c) is a cross-sectional view taken along line JJ of FIG. 16 (a). is there. (a)は図13のリリースチューブ押さえ部材の平面図、(b)は図17(a)のK−K断面図である。(A) is a top view of the release tube pressing member of FIG. 13, (b) is KK sectional drawing of Fig.17 (a). (a)は図13の係合解除維持部と支圧部と定着ブロックが組み立てられた様子を表す斜視図、(b)は図18(a)の側面図である。(A) is a perspective view showing a state where the disengagement maintaining part, the pressure bearing part, and the fixing block of FIG. 13 are assembled, and (b) is a side view of FIG. 18 (a). (a)は図13のリリースチューブの平面図、(b)は図19(a)のL−L断面図である。(A) is a top view of the release tube of FIG. 13, (b) is LL sectional drawing of Fig.19 (a). 係合解除工程を表す断面図である。It is sectional drawing showing an engagement cancellation | release process. 係合解除維持工程及び緊張力解放工程を表す断面図である。It is sectional drawing showing a disengagement maintenance process and a tension release process. 係合解除維持解除工程を表す断面図である。It is sectional drawing showing an engagement cancellation | release maintenance cancellation | release process. 再係合工程を表す断面図である。It is sectional drawing showing a re-engagement process.

符号の説明Explanation of symbols

1………緊張力解放装置
2………構造体
3………緊張材
3a……線材
4………定着部
5………支圧部
6………係合解除維持部
6A……反力負担部材
6B……支持部材
7………再定着補助部
8………定着ブロック(くさび受具)
8a……挿通孔
8b……挿入孔
8c……伝達部材螺合穴
8d……摺動手段螺合穴
9………ウェッジ(くさび)
10……第1支圧部構成部材
10a…貫通孔
10b…摺動溝
10c…挿入孔
10d…第2支圧部構成部材螺合穴
10e…定着ブロック螺合穴
11……第2支圧部構成部材
11a…挿通孔
11b…ガイド挿入孔
11c…第1支圧部構成部材挿入孔
12……ガイド
13……リリースチューブ
13a…係止部
13b…挿入部
14……リリースチューブ押さえ部材
14a…突出部
14b…雌螺子部
14c…挿通孔
15……雄ねじ
15a…雄螺子部
16……係合誘導部材
16a…挿通孔
16b…挿入孔
17……摺動手段
18……伝達部材
18a…伝達部材構成材
18b…確認窓
19……高さ調整部材
20……緊張力導入装置
21……緊張力解放装置
22……定着具
22a…雄型コーン
22b…ガイド
22c…支圧板
22d…雌型コーン
24……定着部
25……支圧部
26……係合解除維持部
26A…反力負担部材
26B…支持部材
27……再定着部
28……定着ブロック(くさび受具)
28a…挿通孔
28b…挿入孔
29……ウェッジ(くさび)
30……第1支圧部構成部材
30a…貫通孔
30b…摺動溝
30c…嵌合溝
30e…螺合穴
31……第2支圧部構成部材
31a…螺合孔
31b…装着孔
31c…確認窓
32……ガイド
33……リリースチューブ
33a…係止部
33b…定着ブロック挿入部
33c…リリースチューブ押さえ部材挿入部
34……リリースチューブ押さえ部材
34a…突出部
34c…挿通孔
35……固定手段
37……軸部
37a…ボルト
38……作用部
38a…平坦部
38b…曲面部
39……操作部
DESCRIPTION OF SYMBOLS 1 ......... Tension release device 2 ......... Structure 3 ......... Tension material 3a ... Wire material 4 ......... Fixing part 5 ......... Pressure bearing part 6 ......... Disengagement maintenance part 6A ... Reverse Force bearing member 6B …… Supporting member 7 ……… Refixing auxiliary portion 8 ……… Fixing block (wedge holder)
8a: Insertion hole 8b ... Insertion hole 8c ... Transmission member screwing hole 8d ... Sliding means screwing hole 9 ... Wedge (wedge)
DESCRIPTION OF SYMBOLS 10 ... 1st bearing part structural member 10a ... Through-hole 10b ... Sliding groove 10c ... Insertion hole 10d ... 2nd bearing part structural member screwing hole 10e ... Fixing block screwing hole 11 ... 2nd bearing part Component member 11a ... Insertion hole 11b ... Guide insertion hole 11c ... First pressure-bearing portion component member insertion hole 12 ... Guide 13 ... Release tube 13a ... Locking portion 13b ... Insertion portion 14 ... Release tube pressing member 14a ... Projection Part 14b ... female screw part 14c ... insertion hole 15 ... male screw 15a ... male screw part 16 ... engagement guide member 16a ... insertion hole 16b ... insertion hole 17 ... sliding means 18 ... transmission member 18a ... transmission member configuration Material 18b ... Confirmation window 19 ... Height adjusting member 20 ... Tension introduction device 21 ... Tension release device 22 ... Fixing tool 22a ... Male cone 22b ... Guide 22c ... Supporting plate 22d ... Female cone 24 ... ... Fixing unit 2 ...... Bearing unit 26 ...... disengagement maintaining portion 26A ... reaction force bearing member 26B ... support member 27 ...... recolonization portion 28 ...... fixing blocks (wedge receiving fixture)
28a ... insertion hole 28b ... insertion hole 29 ... wedge (wedge)
30... First supporting part component 30 a... Through hole 30 b. Sliding groove 30 c. Fitting groove 30 e. Screwing hole 31 .. Second supporting part component 31 a. Confirmation window 32... Guide 33... Release tube 33 a... Locking portion 33 b .. fixing block insertion portion 33 c... Release tube pressing member insertion portion 34... Release tube pressing member 34 a. 37... Shaft portion 37 a... Bolt 38 .. Action portion 38 a... Flat portion 38 b.

Claims (7)

緊張材に緊張力を導入する緊張力導入装置の反力を負担するくさび受具と、
前記緊張材が挿通し、前記緊張材と一体化した状態で前記くさび受具に係合するくさびと、
前記緊張材が前記緊張力導入装置に引っ張られて前記くさび受具から離れる向きへ移動したときに、前記くさびからの緊張力を負担し、前記くさびの前記くさび受具に近づく向きへの移動を阻止する反力負担部材とを有し、
前記反力負担部材は、前記くさび受具と構造体との間で前記緊張材の軸線方向に摺動自在に配置されたリリースチューブ押さえ部材と、前記緊張材上で前記くさびと前記リリースチューブ押さえ部材との間に前記緊張材の軸線方向に摺動自在に配置され、前記くさび受具に構造体側の端面から挿入された状態で前記リリースチューブ押さえ部材に係止されたリリースチューブとから構成されることを特徴とする緊張材の緊張力解放装置。
A wedge receiver that bears the reaction force of the tension introduction device that introduces tension to the tension material;
A wedge that is inserted through the tendon and is engaged with the wedge receiver in an integrated state with the tendon;
When the tension material is pulled by the tension force introducing device and moves in a direction away from the wedge receiver, the tension force from the wedge is borne and the wedge moves in a direction closer to the wedge receiver. A reaction force bearing member for blocking,
The reaction force bearing member includes a release tube pressing member that is slidable in an axial direction of the tendon between the wedge receiver and the structure, and the wedge and the release tube press on the tendon. And a release tube that is slidably disposed in the axial direction of the tendon between the members and is engaged with the release tube pressing member while being inserted into the wedge receiver from the end surface on the structure side. A tension release device for a tension material.
前記緊張材を定着させる定着具に被せた状態で構造体に設置され、前記緊張力導入装置を支持することを特徴とする請求項1に記載の緊張材の緊張力解放装置。   The tension material releasing device of the tension material according to claim 1, wherein the tension material is installed on the structure in a state of being covered with a fixing tool for fixing the tension material, and supports the tension force introducing device. 前記反力負担部材は前記くさび受具に対して前記緊張材の軸線方向に配置されていることを特徴とする請求項1又は2に記載の緊張材の緊張力解放装置。   3. The tension-strength releasing device for a tension member according to claim 1, wherein the reaction force bearing member is disposed in an axial direction of the tension member with respect to the wedge receiver. 前記反力負担部材を支持する支持部材を有することを特徴とする請求項1乃至3の何れかに記載の緊張材の緊張力解放装置。   The tension member releasing device according to claim 1, further comprising a support member that supports the reaction force bearing member. 前記反力負担部材が前記くさび受具に対して前記緊張材の軸線方向に摺動可能に配置され、
緊張力が導入されている前記緊張材が挿通している前記くさびを前記くさび受具に近づく向きへ移動させ、前記くさびを前記くさび受具に係合させるように誘導する係合誘導部材を有することを特徴とする請求項1乃至4の何れかに記載の緊張材の緊張力解放装置。
The reaction force bearing member is slidably disposed in the axial direction of the tendon with respect to the wedge receiver;
There is provided an engagement inducing member for guiding the wedge to be engaged with the wedge receiver by moving the wedge inserted through the tension material into which the tension force is introduced toward the wedge receiver. The tension | tensile_strength release apparatus of the tension | tensile_strength material in any one of Claim 1 thru | or 4 characterized by the above-mentioned.
前記緊張力導入装置によって前記緊張材を引っ張り、前記くさびと前記くさび受具の係合を解除する係合解除工程と、
請求項5に記載の緊張力解放装置の反力負担部材を用いて前記係合の解除状態を維持させる係合解除維持工程とを有することを特徴とする緊張材の緊張力解放工法。
An engagement releasing step of pulling the tension material by the tension introduction device and releasing the engagement between the wedge and the wedge receiver;
A tension release method for a tension member, comprising: a disengagement maintaining step of maintaining the disengaged state using the reaction force bearing member of the tension force release device according to claim 5 .
前記係合解除工程の後に、前記緊張材の緊張力解放装置の前記係合誘導部材を用いて前記くさびを前記くさび受具に近づく向きへ移動させて前記くさびと前記くさび受具とを係合させ、前記緊張材を定着させる盛替工程を有することを特徴とする請求項6に記載の緊張材の緊張力解放工法。 After the disengagement step, engaging the said wedge receiving fixture and the wedge is moved in the direction approaching the wedge into the wedge receiving fixture using said engagement induction member tension release device of the tendon The tension release method of the tension material according to claim 6, further comprising: a refilling step for fixing the tension material.
JP2007261901A 2007-10-05 2007-10-05 A tension release device for a tension material and a tension release method for the tension material using the tension release device. Active JP5351403B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007261901A JP5351403B2 (en) 2007-10-05 2007-10-05 A tension release device for a tension material and a tension release method for the tension material using the tension release device.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007261901A JP5351403B2 (en) 2007-10-05 2007-10-05 A tension release device for a tension material and a tension release method for the tension material using the tension release device.

Publications (2)

Publication Number Publication Date
JP2009091764A JP2009091764A (en) 2009-04-30
JP5351403B2 true JP5351403B2 (en) 2013-11-27

Family

ID=40664017

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007261901A Active JP5351403B2 (en) 2007-10-05 2007-10-05 A tension release device for a tension material and a tension release method for the tension material using the tension release device.

Country Status (1)

Country Link
JP (1) JP5351403B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101171505B1 (en) * 2010-04-29 2012-08-07 이창남 Assembly Method of Multi Hole Wire Cone Fixture Combined with Different Steel Materials
KR101139393B1 (en) 2011-02-16 2012-04-27 한국건설기술연구원 Anchorage apparatus for frp cable and construction method using the same
JP6812277B2 (en) * 2017-03-13 2021-01-13 日本基礎技術株式会社 Holder and anchor construction method for uncurtain don

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5950826B2 (en) * 1980-03-29 1984-12-11 黒沢建設株式会社 PC steel wire tension fixing method
JPS5988570A (en) * 1982-11-10 1984-05-22 黒沢建設株式会社 Releasing of tension of pc steel material
JPH0482255U (en) * 1990-11-29 1992-07-17

Also Published As

Publication number Publication date
JP2009091764A (en) 2009-04-30

Similar Documents

Publication Publication Date Title
JP2011524952A (en) Fixing, attaching, and tensioning elongated reinforcing members
JP6200115B1 (en) Drilling guide device and guide hole drilling method
JP5351403B2 (en) A tension release device for a tension material and a tension release method for the tension material using the tension release device.
JP6872767B2 (en) Support structure, support method and construction method of suspended scaffolding
JP4029105B2 (en) Connector, PC member manufacturing apparatus and manufacturing method
WO2016158382A1 (en) Method for replacing base isolation device, and base isolation structure
CN110541580A (en) prestressed carbon fiber plate anchorage device system
JP4953775B2 (en) Prestress introduction device and anchor structure thereof
KR100637279B1 (en) A cylinder type jack
KR101844765B1 (en) The hollow steel bar which self-prestressed using by counteraction press system and prestressing method using that
KR101660888B1 (en) Girder with pressing embed ahchorage apparatus and the girder construction method therewith
CN103850434A (en) Template capable of finishing construction of shear wall tension screw at one side
CN111119029A (en) Low-retraction anchoring device for wedge-shaped prestressed tendons and using method
KR102420849B1 (en) Safety rope fixing mechanism for coupling a clamp
KR101759199B1 (en) A form bringing out stripping and deck plate using the form
KR102146821B1 (en) Rebar coupler
KR101561043B1 (en) Composite pressing ahchoraging apparatus and structure reinforcing method using the same
JP6436716B2 (en) Method of connecting coupler to external cable for introducing prestress in bridge girder and tension introducing frame used in the method
KR102105232B1 (en) Temporary bent connecting steel pipe pile cap pressing against the pile
KR101742788B1 (en) Repairing and reinforcing structure of concrete apparatus, and the method for installing the repairing and reinforcing structure
JP5947140B2 (en) Prestressed concrete construction method and prestressed concrete structure
JP2007262808A (en) Prestress force introducing device, its anchoring structure, prestressed joint structure and anchoring method of prestress force introducing device
KR20100107100A (en) Prestressed girder stand, installing method thereof, girder manufacturing method using the same
CN210918330U (en) Prestressed carbon fiber plate anchorage device system
JP6359371B2 (en) Production method

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20100916

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120828

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20121029

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20121120

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20130116

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20130730

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20130823

R150 Certificate of patent or registration of utility model

Ref document number: 5351403

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

S531 Written request for registration of change of domicile

Free format text: JAPANESE INTERMEDIATE CODE: R313531

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250