JP4395112B2 - PC steel direct burying connection method and connection part structure with restraint force relaxation function - Google Patents

PC steel direct burying connection method and connection part structure with restraint force relaxation function Download PDF

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JP4395112B2
JP4395112B2 JP2005231174A JP2005231174A JP4395112B2 JP 4395112 B2 JP4395112 B2 JP 4395112B2 JP 2005231174 A JP2005231174 A JP 2005231174A JP 2005231174 A JP2005231174 A JP 2005231174A JP 4395112 B2 JP4395112 B2 JP 4395112B2
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connection
steel
concrete
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steel material
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JP2007046313A (en
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毅 荒木
隆之 由利
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Kobelco Wire Co Ltd
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Shinko Wire Co Ltd
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Description

本発明は、隣接する先行工区と後行工区のコンクリート打継部にて直接埋設方式により両工区のPC鋼材相互を緊張下に接続するためのPC鋼材の直接埋設接続方法及び該方法の実施に好適に使用される拘束力緩和機能を備える接続部構造に関するものである。   The present invention relates to a method of directly embedding and connecting PC steel materials for connecting PC steel materials of both work zones under tension by a direct embedding method at the concrete joints of adjacent preceding and succeeding work zones, and implementation of the method. The present invention relates to a connection structure having a restraining force relaxation function that is preferably used.

従来、ポストテンション方式プレストレストコンクリート(PC)構造において、コンクリートにプレストレスを与えるために用いるPC鋼材を接続するコンクリート打継部では、先行工区Aと後行工区Bの各PC鋼材を図5に例示するような汎用の接続装置1(非特許文献1参照) を用いて接続した後、後行工区BのPC鋼材4を緊張する際に接続装置1がコンクリート16によって移動を拘束されないようにするために、図4に示すように「カプラーシース」と通称される空間形成用の殻管14を用いて、コンクリート16中に接続装置1を収める空間を形成することが行われていた。そして、後行工区BのPC鋼材4の緊張終了後、PC鋼材4と、その緊張の際に、接続装置1の場合と同様にコンクリート16に拘束されないようにするためのPC鋼材用シースの間にグラウトを充填するのに併せて、カプラーシース14で形成された空間にもグラウト材15を充填していた。
株式会社シー・シー・エル・ジャパン資料「CCLシングルストランド工法−設計施工基準−」(第15版(1996年10月))第7頁
Conventionally, in a post-tension type prestressed concrete (PC) structure, in a concrete transfer part for connecting PC steel used for prestressing concrete, each PC steel in the preceding work area A and the following work area B is illustrated in FIG. In order to prevent the connecting device 1 from being restrained from being moved by the concrete 16 when the PC steel material 4 in the subsequent work section B is tensioned after connecting using the general-purpose connecting device 1 (see Non-Patent Document 1). In addition, as shown in FIG. 4, a space for housing the connecting device 1 is formed in the concrete 16 by using a space forming shell tube 14 commonly called a “coupler sheath”. And after the tension | tensile_strength of the PC steel material 4 of the following work area B, between the PC steel material 4 and the sheath for PC steel materials for preventing it from being restrained by the concrete 16 like the case of the connection apparatus in the case of the tension | tensile_strength. In addition to filling the grout, the space formed by the coupler sheath 14 is also filled with the grout material 15.
Page 7 of CLC Japan Co., Ltd. “CCL Single Strand Method-Design and Construction Standards” (15th Edition (October 1996))

なお、接続装置1によるPC鋼材4、4の接続は図5を参照して次のように行われていた。すなわち、先行工区Aのコンクリート16に埋設したPC鋼材4の端部をスリーブ17に挿入してウエッジ18を嵌入させることによりPC鋼材4の端部を固定させ、コンクリート16の打継面Sに支圧板8を埋設し、この支圧板8によってスリーブ17を支持させている。この場合、スリーブ17及びウエッジ18で一次側接続部2が形成される。一方、先行工区Aに隣接する後行工区BにおいてはPC鋼材4の端部にコンプレッショングリップ20が取付けられ、このコンプレッショングリップ20がスリーブ21に嵌入されることによりPC鋼材4の端部に端末具が取付けられている。この場合、コンプレッショングリップ20及びスリーブ21で二次側接続部3が形成される。スリーブ17及び21にはそれぞれ雌ねじが形成され、外周にねじを有するプラグ19がスリーブ17及び21に螺合されることにより、両PC鋼材4が同一線上で連結されるようになっている。   In addition, the connection of the PC steel materials 4 and 4 by the connection apparatus 1 was performed as follows with reference to FIG. That is, the end portion of the PC steel material 4 embedded in the concrete 16 in the preceding section A is inserted into the sleeve 17 and the wedge 18 is inserted, thereby fixing the end portion of the PC steel material 4 and supporting the joining surface S of the concrete 16. A pressure plate 8 is embedded, and the sleeve 17 is supported by the support pressure plate 8. In this case, the primary side connection portion 2 is formed by the sleeve 17 and the wedge 18. On the other hand, in the succeeding work section B adjacent to the preceding work section A, a compression grip 20 is attached to the end portion of the PC steel material 4, and when the compression grip 20 is fitted into the sleeve 21, a terminal tool is attached to the end portion of the PC steel material 4. Is installed. In this case, the secondary connection portion 3 is formed by the compression grip 20 and the sleeve 21. Each of the sleeves 17 and 21 is formed with an internal thread, and a plug 19 having a screw on the outer periphery is screwed to the sleeves 17 and 21 so that both PC steel materials 4 are connected on the same line.

ところで、従来は図4に示すように、後行工区Bのコンクリート16を打設する際に、接続装置1全体を覆うカプラーシース14を用いて空間を形成し、後行工区Bでの緊張終了後、その空間と接続装置1との空隙にセメントグラウト等のグラウト材15を注入するようにしている。この方法は、PC鋼材4とPC鋼材用シースの間に緊張終了後にグラウト材を充填する場合でも、また、緊張終了後のグラウト材充填が不要な特徴を持つプレグラウトPC鋼材(時間の経過につれて硬化する特殊な樹脂とポリエチレンシースで被覆されたPC鋼材)を用いる場合でも、殆ど同様の施工方法が用いられるが、図4はプレグラウトPC鋼材を用いる場合を例示している。なお、プレグラウトPC鋼材を用いる場合は、後行工区Bのコンクリート16を打設する前に、カプラーシース14の中にプレグラウトPC鋼材に用いるのと同じ樹脂を充填することも行われている。   By the way, conventionally, as shown in FIG. 4, when placing the concrete 16 in the subsequent work section B, a space is formed by using the coupler sheath 14 that covers the entire connecting device 1, and the tension in the subsequent work section B ends. Thereafter, a grout material 15 such as cement grout is injected into the gap between the space and the connection device 1. In this method, even when the grout material is filled between the PC steel material 4 and the PC steel material sheath after the end of the tension, the pre-grout PC steel material has a feature that does not require the grout material filling after the end of the tension (hardening with time). Even in the case of using a special resin and a PC steel coated with a polyethylene sheath, almost the same construction method is used, but FIG. 4 illustrates the case of using a pre-grout PC steel. In addition, when using pregrout PC steel materials, before placing the concrete 16 of the following work area B, it is also performed to fill the coupler sheath 14 with the same resin as used for the pregrout PC steel materials.

このように、プレグラウトPC鋼材を用いることによって施工の省力化及び施工品質の向上が図れるようになってきているが、それでもPC鋼材の接続具の使用が必要な構造の場合、PC鋼材は現場でのグラウト充填がたとえ不要であっても、接続部分のカプラーシース14で形成されてなる空間は現場でのグラウト充填がやはり必要であり、施工の省力化及び施工品質の向上を推進する上での支障となっていることは依然変わっていないものである。   As described above, the use of pre-grout PC steel has made it possible to save labor and improve construction quality. However, in the case of a structure that still requires the use of PC steel connectors, Even if no grout filling is required, the space formed by the coupler sheath 14 in the connecting portion still needs grout filling in the field, which is necessary for promoting labor saving and improvement of construction quality. The hindrance has not changed.

本発明は、このような問題点の解消を図るために成されたものであり、したがって本発明の目的は、PC鋼材の接続装置に対して空間形成用殻管を不要として現場での充填材注入作業の省略化を可能とし、もって現場作業の迅速化及び省力化並びに作業コストの低減を推進し得るPC鋼材の直接埋設接続方法並びに該方法の実施に好適に使用される拘束力緩和機能を備える接続部構造を提供することにある。   The present invention has been made to solve such problems, and the object of the present invention is to eliminate the need for a space-forming shell tube for the connecting device for PC steel materials, and to provide an on-site filler. A method of directly embedding and connecting PC steel, which enables the omission of the injection work, thereby promoting the speed and labor saving of the field work and the reduction of the work cost, and the restraining force relaxation function suitably used for the implementation of the method. It is in providing the connection part structure provided.

前記の課題を解決するために、この発明では以下の構成を採用したのである。   In order to solve the above problems, the present invention employs the following configuration.

即ち、本発明は、上記の目的を達成するため以下に述べる構成としたものである。即ち、本発明における請求項1の発明は、先行工区Aと後行工区Bのコンクリート打継部にて、一次側接続部2と二次側接続部3とを備える接続装置1を用いて直接埋設方式によりPC鋼材4を接続するPC鋼材の緊張接続方法において、後行工区BのPC鋼材4を緊張する際に接続装置1をコンクリート16の支圧による拘束力に抗し移動可能にするために、二次側接続部3の端末部に関連させて支圧緩和手段5を設ける一方、接続装置1とコンクリート16との直接の固着を回避させるために、接続装置1の外周部に外被層6を被着させることを特徴とするPC鋼材の直接埋設接続方法である。   That is, the present invention has the following configuration in order to achieve the above object. That is, the invention of claim 1 in the present invention directly uses the connecting device 1 provided with the primary side connecting portion 2 and the secondary side connecting portion 3 at the concrete joint portion of the preceding work section A and the succeeding work section B. In the tension connection method of the PC steel material 4 which connects the PC steel material 4 by the burying method, when the PC steel material 4 in the subsequent work section B is tensioned, the connection device 1 can be moved against the restraining force caused by the bearing pressure of the concrete 16. In order to avoid the direct sticking between the connecting device 1 and the concrete 16 while providing the support pressure relaxation means 5 in relation to the terminal portion of the secondary side connecting portion 3, A method of directly embedding and connecting PC steel characterized by depositing a layer 6.

また、本発明における請求項2の発明は、先行工区Aと後行工区Bのコンクリート打継部にて、直接埋設方式によりPC鋼材4を緊張下に接続するための一次側接続部2と二次側接続部3とを備える接続装置1に付設してなる接続部構造であって、コンクリート16に比し軟質の材料からなる圧縮可能な中実盤体7に形成され後行工区BのPC鋼材4に囲ませ二次側接続部3の端末部に取着してなる支圧緩和手段5と、接続装置1の外周部に被着してなる外被層6とを含むことを特徴とする拘束力緩和機能を備える接続部構造である。   In the invention of claim 2 in the present invention, the primary side connection portion 2 and the second side connection portion 2 for connecting the PC steel material 4 under tension by the direct burying method in the concrete joint portion of the preceding work section A and the succeeding work section B. It is a connection part structure attached to the connection apparatus 1 provided with the secondary side connection part 3, Comprising: It forms in the solid board body 7 which can be compressed and consists of a soft material compared with the concrete 16, PC of the following work area B It is characterized by including a support pressure relaxation means 5 formed by being surrounded by a steel material 4 and being attached to a terminal part of the secondary side connection part 3, and a covering layer 6 being attached to the outer peripheral part of the connection device 1. It is a connection part structure provided with the restraint force relaxation function to do.

また、本発明における請求項3の発明は、先行工区Aと後行工区Bのコンクリート打継部にて、直接埋設方式によりPC鋼材4を緊張下に接続するための一次側接続部2と二次側接続部3とを備える接続装置1に付設される接続部構造であって、容積不変の中空盤体に形成され先行工区AのPC鋼材4に囲ませ一次側接続部2の端末部と支圧板8の間に介設される一次側容器9、圧縮による容積可変の中空盤体に形成され後行工区BのPC鋼材4に囲ませ二次側接続部3の端末部に取着される二次側容器10、接続装置1に添わせて一次側・二次側両容器9、10を連絡する配管11、二次側容器10内に充填され時間の経過により硬化する未硬化の充填材12の各部材からなる支圧緩和手段5と、接続装置1の外周部に被着してなる外被層6とを含むことを特徴とする拘束力緩和機能を備える接続部構造である。   In the invention of claim 3 in the present invention, the primary connecting portion 2 and the second connecting portion 2 for connecting the PC steel material 4 under tension by the direct burying method in the concrete joint portion of the preceding work section A and the succeeding work section B. It is a connection part structure attached to the connection apparatus 1 provided with the secondary side connection part 3, Comprising: The terminal part of the primary side connection part 2 enclosed in PC steel materials 4 of the preceding work area A formed in the hollow disk body of volume unchanged The primary side container 9 interposed between the support plates 8 is formed in a hollow disk body of variable volume by compression, and is attached to the terminal part of the secondary side connection part 3 by being surrounded by the PC steel material 4 in the subsequent work section B. Secondary container 10, pipe 11 connecting both primary and secondary containers 9, 10 along with connection device 1, filling in secondary container 10 and uncured filling that cures over time The support pressure relaxation means 5 made of each member of the material 12 and the outer cover layer formed on the outer peripheral portion of the connecting device 1 A connection part structure comprising a binding relaxation function, which comprises and.

また、本発明における請求項4の発明は、上記請求項2又は請求項3に記載の拘束力緩和機能を備える接続部構造に関して、外被層6が合成樹脂軟質テープ等からなる防食テープ13を接続装置1の外周部に螺旋状に巻着することによって形成される構成であることを特徴とする。   According to a fourth aspect of the present invention, there is provided the anticorrosion tape 13 in which the outer cover layer 6 is made of a synthetic resin soft tape or the like with respect to the connection portion structure having the restraining force relaxation function according to the second or third aspect. It is the structure formed by winding around the outer peripheral part of the connection apparatus 1 helically.

また、本発明における請求項5の発明は、上記請求項2又は請求項3に記載の拘束力緩和機能を備える接続部構造に関して、外被層6が熱収縮合成樹脂チューブ等からなる軟質チューブを接続装置1の外周部に被着することによって形成される構成であることを特徴とする。   Further, the invention of claim 5 in the present invention relates to a connecting portion structure having a restraining force relaxation function according to claim 2 or claim 3, wherein the outer cover layer 6 is a soft tube made of a heat shrinkable synthetic resin tube or the like. It is the structure formed by attaching to the outer peripheral part of the connection apparatus 1. It is characterized by the above-mentioned.

このような本発明によれば、先行工区Aと後行工区Bのコンクリート打継部にて、直接埋設方式によりPC鋼材4を緊張下に接続するに際して、接続装置1の二次側接続部3の端末部に関連させて簡単な構造になる支圧緩和手段5を取着させ、かつ、防食テープ13を螺旋状に巻着するなどの簡易な手法によって接続装置1の外周部に外被層6を被着させるだけの簡単な作業を行えば良くて、接続装置1全体を覆わせる空間形成用殻管が省略てき、また、接続装置1の周囲の空間に現場で充填材を注入する作業が不要になる。   According to the present invention as described above, when the PC steel material 4 is connected under tension by the direct burying method at the concrete joints in the preceding work area A and the succeeding work area B, the secondary side connection part 3 of the connection device 1 is used. An outer cover layer is formed on the outer peripheral portion of the connection device 1 by a simple method such as attaching the supporting pressure relaxation means 5 having a simple structure in relation to the terminal portion of the wire and winding the anticorrosion tape 13 in a spiral shape. The space forming shell tube for covering the entire connecting device 1 is omitted, and the work for injecting the filler into the space around the connecting device 1 on the spot is sufficient. Is no longer necessary.

さらに、本発明によれば、後行工区BのPC鋼材4を緊張させる際、支圧緩和手段5がコンクリートの接続装置1への拘束力を緩和する機能を発揮し、同時に、コンクリートの接続装置1に対する付着力を緩衝することから、充填材を不要としながらもPC鋼材4の緊張に伴う接続装置1の移動を円滑に行わせることができる。   Furthermore, according to the present invention, when tensioning the PC steel material 4 in the subsequent work section B, the support pressure relaxation means 5 exhibits the function of relaxing the binding force to the concrete connection device 1, and at the same time, the concrete connection device. Since the adhesive force to 1 is buffered, the connection device 1 can be smoothly moved along with the tension of the PC steel material 4 while eliminating the need for a filler.

本発明は、以下に記載されるような効果を奏する。   The present invention has the following effects.

すなわち本発明によれば、PC鋼材を接続する現場作業に当たって、中実盤体等の簡単な構造になる支圧緩和手段と防食テープ等により簡易な手法で形成される外被層とをPC鋼材用の接続装置に対して付設するだけでよいので、現場でのグラウト充填作業が不可欠であった従来の作業に比して工法が簡単でかつ短時間処理を行え、その結果、省力化及び迅速化が図れる。しかも本発明によれば、従来のカプラーシースを用いた工法と比較して何等遜色がない緊張力伝達性状を奏することが可能であって、PC鋼材施工工事に対する品質向上を推進する上にも頗る有用である。   That is, according to the present invention, in the field work for connecting the PC steel material, the support pressure relaxation means having a simple structure such as a solid board body and the outer cover layer formed by a simple method using the anticorrosion tape or the like are used. As a result, the construction method is simpler and can be processed in a shorter time compared to the conventional work where grout filling work is indispensable. Can be achieved. Moreover, according to the present invention, it is possible to achieve a tension transmission property that is comparable to the conventional construction method using a coupler sheath, and it is also possible to promote quality improvement for PC steel construction work. Useful.

以下、本発明の実施形態を、添付図面を参照しながら具体的に説明する。   Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

図1には、本発明の第1の実施形態に係る接続部構造を備える接続装置が、接続状態を示す側面図で表される。この第1の実施形態において、コンクリート構造物の先行工区Aと後行工区Bとに張設した両PC鋼材4を緊張下で接続するための接続装置1には従来から用いられている一次側接続部2と二次側接続部3とを備える周知の各種接続装置が使用可能であって、先行工区AのPC鋼材4を緊張する作業は、その接続端において一次側接続部2を用いて行われ、次に二次側接続部3を用いて後行工区BのPC鋼材4が接続される。   FIG. 1 is a side view showing a connection state of a connection device including a connection portion structure according to the first embodiment of the present invention. In the first embodiment, the connecting device 1 for connecting the PC steel members 4 stretched in the preceding work section A and the succeeding work section B of the concrete structure under tension is the primary side conventionally used. Various known connection devices including the connection portion 2 and the secondary side connection portion 3 can be used, and the work of tensioning the PC steel material 4 in the preceding section A is performed using the primary side connection portion 2 at the connection end. Next, the PC steel material 4 in the subsequent work section B is connected using the secondary side connection portion 3.

接続装置1における支圧板8とは反対側の端部、すなわち二次側接続部3の端末部には、コンクリートの支圧に基づく移動拘束を緩和するための本発明を特徴付ける要素部材の一つである支圧緩和手段5が取着されている。この第1の実施形態の場合の支圧緩和手段5は、外周形状が二次側接続部3のそれと同形状又は略同形状を成す例えば合成樹脂製になる圧縮可能な中実盤体7が用いられていて、この場合、中実盤体7としては軟質ゴム、スチロール樹脂又はこれに類するコンクリートに比し十分に柔らかい材料により形成して、例えば厚さが5〜40mmの中心部にPC鋼材4が挿通される孔を持つドーナッツ盤状のものが用いられて、これを二次側接続部3の端末部に貼りつけるなどして取着させる。   One of the element members characterizing the present invention for relieving the movement restraint based on the bearing pressure of the concrete at the end of the connecting device 1 opposite to the bearing plate 8, that is, at the end of the secondary side connecting portion 3. The support pressure alleviating means 5 is attached. The support pressure relaxation means 5 in the case of the first embodiment has a compressible solid board 7 made of, for example, a synthetic resin whose outer peripheral shape is the same as or substantially the same as that of the secondary side connection portion 3. In this case, the solid board body 7 is made of a softer material than soft rubber, styrene resin, or similar concrete, and is, for example, a PC steel material in the center having a thickness of 5 to 40 mm. A donut board-like thing with a hole through which 4 is inserted is used, and this is attached to the terminal part of the secondary side connection part 3 or the like.

一方、接続装置1の外周部には、該接続装置1とその周囲のコンクリートとの直接の固着を回避させるための、防食テープ13で実現される外被層6が被着されている。前記外被層6としては、例えば合成樹脂製軟質テープからなる帯状の防食テープ13を半幅程度がラップするように1層又は複数層の螺旋状に巻着させることによって現場にて簡単に外被層6を設けることが可能である。   On the other hand, on the outer peripheral portion of the connecting device 1, an outer covering layer 6 realized by an anticorrosion tape 13 is attached so as to avoid direct adhesion between the connecting device 1 and the surrounding concrete. As the jacket layer 6, for example, a strip-shaped anticorrosion tape 13 made of a synthetic resin soft tape is wound in a single layer or a plurality of layers in a spiral shape so as to wrap around about a half width, so that the jacket can be easily formed on site. A layer 6 can be provided.

このように構成される第1の実施形態においては、二次側接続部3を用いて後行工区BのPC鋼材4を接続するのに相前後して、中実盤体7からなる支圧緩和手段5を二次側接続部3の端末部に取着し、続いて、防食テープ13を螺旋巻着してこれにより拘束力緩和機能を備える接続部構造が形成される。   In 1st Embodiment comprised in this way, it is connected to the PC steel material 4 of the following work area B using the secondary side connection part 3, and the bearing pressure which consists of a solid board body 7 is connected. The relaxation means 5 is attached to the terminal portion of the secondary side connection portion 3, and then the anticorrosion tape 13 is spirally wound to thereby form a connection portion structure having a restraining force relaxation function.

その後、後行工区Bでのコンクリート張設が終わってから、後行工区BのPC鋼材4を緊張させることにより、PC鋼材4の直接埋設接続作業が完了する。その際、後行工区BのPC鋼材4の緊張によって、接続装置1には支圧板8から離れる方向に外力が加わるが、圧縮可能な中実盤体7が備える拘束力緩和機能と防食テープ13からなる外被層6が備える緩衝機能とが相まって、接続装置1をコンクリートに拘束されることなく所要量だけ移動させることができる。   Then, after the concrete laying in the succeeding work section B is finished, the PC steel material 4 in the succeeding work section B is tensioned, whereby the direct embedment connecting work of the PC steel material 4 is completed. At that time, the external force is applied to the connection device 1 in the direction away from the bearing plate 8 due to the tension of the PC steel material 4 in the subsequent work section B, but the restraining force relaxation function and the anticorrosion tape 13 provided in the compressible solid board body 7 are provided. Combined with the buffer function of the covering layer 6 made of the above, the connecting device 1 can be moved by a required amount without being constrained by the concrete.

図2には、本発明の第2の実施形態に係る接続部構造を備える接続装置が、接続状態を示す側面図で表される。また、図3には、図2図示の支圧緩和手段5における要素部材の一次側容器9が(イ)に、同じく二次側容器10が(ロ)にそれぞれ斜視図で示される。この第2の実施形態において、前述する第1の実施形態のものに類似し、対応する部材には同一の参照符号を付して個々の説明をここでは省略する。   FIG. 2 is a side view showing a connection state of a connection device including the connection portion structure according to the second embodiment of the present invention. FIG. 3 is a perspective view of the primary side container 9 of the element member in the support pressure reducing means 5 shown in FIG. 2 and (b) of the secondary side container 10 in the same manner. The second embodiment is similar to that of the first embodiment described above, and corresponding members are denoted by the same reference numerals, and the description thereof is omitted here.

この第2の実施形態に係る接続部構造において特徴とされる構成は、支圧緩和手段5が一次側容器9、二次側容器10、配管11及び少量の充填材12から形成されている点である。一次側容器9は、容積不変の中空盤体に形成され先行工区AのPC鋼材4に囲ませ一次側接続部2の端末部と支圧板8の間に介設される。二次側容器10は、圧縮による容積可変の中空盤体に形成され後行工区BのPC鋼材4に囲ませ二次側接続部3の端末部に取着される。配管11は、接続装置1に添わせて一次側・二次側両容器9、10を連絡するように設けられる。充填材12は、グラウト材に類似した時間の経過により硬化するタイプの未硬化材であって、二次側容器10内に充填される。   The structure characterized in the connection part structure according to the second embodiment is that the supporting pressure relaxation means 5 is formed of a primary side container 9, a secondary side container 10, a pipe 11, and a small amount of filler 12. It is. The primary side container 9 is formed in a hollow plate body having an invariable volume, is surrounded by the PC steel material 4 in the preceding section A, and is interposed between the terminal part of the primary side connection part 2 and the bearing plate 8. The secondary side container 10 is formed in a hollow disk body having a variable volume by compression, is surrounded by the PC steel material 4 in the subsequent work section B, and is attached to the terminal part of the secondary side connection part 3. The pipe 11 is provided so as to connect both the primary side and secondary side containers 9 and 10 along with the connection device 1. The filler 12 is an uncured material of a type that cures over time similar to a grout material, and is filled in the secondary container 10.

一次側・二次側両容器9、10は、例えば外周形状が接続装置1のそれと同形状又は稍大きい略同形状で、中心にPC鋼材4が貫通する孔を有する円形の深皿状体に形成されていて、一次側容器9は鋼製の容積不変の構造で、支圧板8に底部側を当て合わせて被せられる。二次側容器10は鋼製の深皿状体の本体10A と厚さ10〜40mmの樹脂製又は鋼製の円盤状の蓋10B とで形成され、例えば本体10A の中に蓋10B が入り込むように係合されて圧縮による容積可変な構造となっていて、蓋10B が二次側接続部3の端末部に蓋10B が当接するように取着される。配管11は、ポリエチレン製等の可撓性細管からなり、一次側・二次側両容器9、10内の空間部を連絡するようにして接続装置1に添わせて延設される。   Both the primary side and secondary side containers 9 and 10 are formed in a circular deep dish-like body having, for example, an outer shape substantially the same as that of the connection device 1 or substantially the same shape and having a hole through which the PC steel material 4 passes in the center. The primary container 9 is made of steel and has a volume-invariant structure. The primary container 9 is covered with the bearing plate 8 with its bottom side abutted against it. The secondary container 10 is formed of a steel deep plate-like main body 10A and a resin or steel disc-shaped lid 10B having a thickness of 10 to 40 mm. For example, the lid 10B enters the main body 10A. The lid 10B is attached so that the lid 10B comes into contact with the terminal portion of the secondary side connecting portion 3. The pipe 11 is made of a flexible thin tube made of polyethylene or the like, and extends along the connection device 1 so as to communicate the space portions in both the primary side and secondary side containers 9 and 10.

このように設けられてなる本体10A 内にプレグラウトPC鋼材に用いられるのと同様の、未硬化の充填材12が充填される。一方、接続装置1の外周部には、第1の実施形態の場合と同じような防食テープ13からなる外被層6が被着されている。なお、図示を省略しているが、第1及び第2の各実施形態において、防食テープ13に替えて熱収縮合成樹脂チューブ等からなる軟質チューブを接続装置1の外周部に被着することによって外被層6を形成させるようにすることもまた好ましい態様である。   The uncured filler 12 similar to that used for the pre-grout PC steel is filled in the main body 10A thus provided. On the other hand, on the outer peripheral portion of the connection device 1, an outer cover layer 6 made of the anticorrosion tape 13 similar to the case of the first embodiment is attached. In addition, although illustration is abbreviate | omitted, in each of 1st and 2nd embodiment, it replaces with the anticorrosion tape 13, and adheres the soft tube which consists of a heat shrink synthetic resin tube etc. to the outer peripheral part of the connection apparatus 1. It is also a preferable aspect that the covering layer 6 is formed.

このように構成される第2の実施形態においては、二次側接続部3を用いて後行工区BのPC鋼材4を接続するのに相前後して、上述の構成になる支圧緩和手段5を一次側接続部2及び二次側接続部3の端末部に関連させて取着し、続いて、防食テープ13を螺旋巻着してこれにより拘束力緩和機能を備える接続部構造が形成される。   In the second embodiment configured as described above, the support pressure reducing means configured as described above is connected to the PC steel material 4 in the subsequent work section B using the secondary side connection portion 3. 5 is attached in association with the terminal portions of the primary side connection portion 2 and the secondary side connection portion 3, and then the anticorrosion tape 13 is spirally wound to thereby form a connection portion structure having a restraining force relaxation function. Is done.

その後、後行工区Bでのコンクリート張設が終わってから、後行工区BのPC鋼材4を緊張させることにより、PC鋼材4の直接埋設接続作業が完了する。その際、後行工区BのPC鋼材4の緊張によって、接続装置1には支圧板8から離れる方向に外力が加わるが、圧縮による容積可変の二次側容器10は、内部に充填された未硬化の充填材12のうち、移動量に応じた体積分だけが、配管11を通して一次側容器9に移動する。その結果、二次側容器10が発揮する拘束力緩和機能と防食テープ13からなる外被層6が備える緩衝機能とが相まって作用することから、接続装置1をコンクリートに拘束されることなく所要量だけ移動させることができる。   Then, after the concrete laying in the succeeding work section B is finished, the PC steel material 4 in the succeeding work section B is tensioned, whereby the direct embedment connecting work of the PC steel material 4 is completed. At that time, the external force is applied to the connecting device 1 in the direction away from the bearing plate 8 due to the tension of the PC steel material 4 in the subsequent work section B, but the secondary container 10 having a variable volume due to compression is not filled in the connection device 1. Only the volume of the cured filler 12 corresponding to the amount of movement moves to the primary container 9 through the pipe 11. As a result, the restraining force relaxation function exhibited by the secondary side container 10 and the buffer function provided in the jacket layer 6 made of the anticorrosion tape 13 work together, so that the required amount of the connecting device 1 is not constrained by the concrete. Can only be moved.

以下、本発明の実施例について添付図面を参照しながら説明する。
図6には、図4に示した接続部構造を用いた比較例1のPC鋼材緊張力の遷移状況を表す線図が示され、図7には、図5に示した接続部構造を用いた比較例2のPC鋼材緊張力の遷移状況を表す線図が示される。図8には、本発明方法の実施の形態に係るPC鋼材緊張力の遷移状況を表す線図が示され、この線図は、図1に示される本発明の第1の実施形態に係る接続部構造と同構造を有する接続装置を使用して本発明の効果を確認する実験に行なうことにより得られたものである。そして、カプラーシース14を用いて接続装置全体を覆う空間を形成した図4に示す比較例1における2例(A-1、A-2)と、接続装置をコンクリートに直接埋設させて拘束力を緩和する構造を用いない図5に示す比較例2における3例(B-1、B-2、B-3)とを比較装置として挙げることによって本発明実施例(C-1、C-2)との効果の対比を行うこととした。
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 6 shows a diagram showing the transition state of the PC steel material tension of Comparative Example 1 using the connection structure shown in FIG. 4, and FIG. 7 uses the connection structure shown in FIG. The diagram showing the transition situation of the PC steel material tension of Comparative Example 2 was shown. FIG. 8 shows a diagram representing the transition state of the PC steel tension according to the embodiment of the method of the present invention. This diagram shows the connection according to the first embodiment of the present invention shown in FIG. This was obtained by conducting an experiment for confirming the effect of the present invention using a connection device having the same structure as the partial structure. Then, two examples (A-1 and A-2) in Comparative Example 1 shown in FIG. 4 in which a space covering the entire connection device is formed using the coupler sheath 14, and the connection device is directly embedded in the concrete to restrain the binding force. Example 3 of the present invention (C-1, C-2) by giving three examples (B-1, B-2, B-3) in Comparative Example 2 shown in FIG. It was decided to compare the effects with.

比較例1(A-1、A-2)の場合は、接続端の支圧板に作用していた先行工区の定着力は、後行工区の緊張力の増加に伴って直線的に減少する状況が観察された。比較例2(B-1、B-2、B-3)の場合は、接続装置がコンクリートに拘束されて、後行工区の緊張力が増加しても、支圧板に作用していた先行工区の定着力は殆ど変化しないことが確認された。   In the case of Comparative Example 1 (A-1, A-2), the fixing force of the preceding work section that had been acting on the bearing plate at the connection end decreased linearly as the tension of the subsequent work area increased. Was observed. In the case of Comparative Example 2 (B-1, B-2, B-3), even if the connecting device was restrained by concrete and the tension in the subsequent work area increased, the preceding work area that was acting on the bearing plate It was confirmed that the fixing power of the toner hardly changed.

一方、拘束力緩和機能を備えてなる本発明実施例(C-1、C-2)の場合は、僅かに緊張力のロスは生じたものの、全体的な傾向として、カプラーシース14を用いた比較例1(A-1、A-2)の場合と略同様の緊張力伝達の性状が明らかに観察され、このことから本発明の優れた効果が証された。   On the other hand, in the case of the present invention examples (C-1 and C-2) having a restraining force relaxation function, the coupler sheath 14 was used as an overall tendency although a slight loss of tension occurred. The property of tension transmission similar to that in Comparative Example 1 (A-1, A-2) was clearly observed, and this proved the excellent effect of the present invention.

本発明の第1の実施形態に係る接続状態を示す側面図である。It is a side view which shows the connection state which concerns on the 1st Embodiment of this invention. 本発明の第2の実施形態に係る接続状態を示す側面図である。It is a side view which shows the connection state which concerns on the 2nd Embodiment of this invention. 図2に図示する支圧緩和手段の要素部材の斜視図で、(イ)は一次側容器、(ロ)は二次側容器がそれぞれ示される。FIG. 3 is a perspective view of an element member of the support pressure relaxation means illustrated in FIG. 2, where (A) indicates a primary side container and (B) indicates a secondary side container. 従来のPC鋼材の直接埋設接続方法の説明図である。It is explanatory drawing of the conventional direct embedment connection method of PC steel materials. 従来の接続装置の取付け状態の断面を示す説明図である。It is explanatory drawing which shows the cross section of the attachment state of the conventional connection apparatus. 比較例1のPC鋼材緊張力の遷移状況を表す線図である。It is a diagram showing the transition situation of PC steel materials tension of comparative example 1. 比較例2のPC鋼材緊張力の遷移状況を表す線図である。It is a diagram showing the transition situation of PC steel materials tension of comparative example 2. 本発明方法の実施の形態に係るPC鋼材緊張力の遷移状況を表す線図である。It is a diagram showing the transition situation of PC steel materials tension concerning an embodiment of the method of the present invention.

符号の説明Explanation of symbols

1…接続装置 2…一次側接続部 3…二次側接続部
4…PC鋼材 5…支圧緩和手段 6…外被層
7…中実盤体 8…支圧板 9…一次側容器
10…二次側容器 11…配管 12…充填材
13…防食テープ 14…殻管 15…グラウト材
16…コンクリート A…先行工区 B…後行工区
S…打継面
DESCRIPTION OF SYMBOLS 1 ... Connection apparatus 2 ... Primary side connection part 3 ... Secondary side connection part 4 ... PC steel material 5 ... Supporting pressure relaxation means 6 ... Outer coating layer 7 ... Solid board body 8 ... Supporting pressure plate 9 ... Primary side container 10 ... Two Next side container 11 ... Piping 12 ... Filling material 13 ... Anticorrosion tape 14 ... Shell pipe 15 ... Grouting material 16 ... Concrete A ... Preceding work zone B ... Subsequent work zone S ... Success

Claims (5)

先行工区と後行工区のコンクリート打継部にて、一次側接続部と二次側接続部とを備える接続装置を用いて直接埋設方式によりPC鋼材を接続するPC鋼材の緊張接続方法において、後行工区のPC鋼材を緊張する際に前記接続装置をコンクリートの支圧による拘束力に抗し移動可能にするために、二次側接続部の端末部に関連させて支圧緩和手段を設ける一方、前記接続装置とコンクリートとの直接の固着を回避させるために、接続装置の外周部に外被層を被着させることを特徴とするPC鋼材の直接埋設接続方法。   In the tension connection method of PC steel material, which connects the PC steel material by the direct embedding method using the connecting device having the primary side connection portion and the secondary side connection portion at the concrete joint portion of the preceding work zone and the subsequent work zone, In order to allow the connecting device to move against the restraining force caused by the concrete bearing pressure when tensioning the PC steel material in the working zone, a supporting pressure relaxation means is provided in association with the terminal portion of the secondary side connecting portion. In order to avoid the direct fixation between the connecting device and the concrete, a method for directly embedding and connecting PC steel, wherein an outer layer is attached to the outer peripheral portion of the connecting device. 先行工区と後行工区のコンクリート打継部にて、直接埋設方式によりPC鋼材を緊張下に接続するための一次側接続部と二次側接続部とを備える接続装置に付設してなる接続部構造であって、コンクリートに比し軟質の材料からなる圧縮可能な中実盤体に形成され後行工区のPC鋼材に囲ませ二次側接続部の端末部に取着してなる支圧緩和手段と、接続装置の外周部に被着してなる外被層とを含むことを特徴とする拘束力緩和機能を備える接続部構造。   A connecting part that is attached to a connecting device having a primary side connecting part and a secondary side connecting part for connecting PC steel under tension by a direct burying method at a concrete joint part in a preceding work area and a succeeding work area. The structure is made of a compressible solid board made of a soft material compared to concrete, and it is surrounded by PC steel in the subsequent work zone and attached to the terminal part of the secondary connection part. A connecting portion structure having a restraining force alleviating function, characterized in that it includes means and a covering layer formed on the outer peripheral portion of the connecting device. 先行工区と後行工区のコンクリート打継部にて、直接埋設方式によりPC鋼材を緊張下に接続するための一次側接続部と二次側接続部とを備える接続装置に付設される接続部構造であって、容積不変の中空盤体に形成され先行工区のPC鋼材に囲ませ一次側接続部の端末部と支圧板の間に介設される一次側容器、圧縮による容積可変の中空盤体に形成され後行工区のPC鋼材に囲ませ二次側接続部の端末部に取着される二次側容器、前記接続装置に添わせて一次側・二次側両容器を連絡する配管、二次側容器内に充填され時間の経過により硬化する未硬化の充填材の各部材からなる支圧緩和手段と、接続装置の外周部に被着してなる外被層とを含むことを特徴とする拘束力緩和機能を備える接続部構造。   Connection part structure attached to a connecting device having a primary side connection part and a secondary side connection part for connecting PC steel under tension by a direct burying method at the concrete joint part of the preceding and succeeding work areas A primary container placed between a terminal part of a primary side connecting part and a bearing plate, surrounded by a PC steel material of a preceding work area, formed in a volume-invariant hollow disk body, and a variable volume hollow disk body by compression A secondary container that is formed and surrounded by PC steel in the subsequent work zone and attached to the terminal part of the secondary connection part, a pipe that connects the primary and secondary containers together with the connection device, It is characterized in that it includes a support pressure relaxation means composed of each member of an uncured filler that is filled in the secondary container and hardens over time, and an outer cover layer that adheres to the outer peripheral portion of the connecting device. Connecting portion structure having a restraining force relaxation function. 外被層が、合成樹脂軟質テープ等からなる防食テープを接続装置の外周部に螺旋状に巻着することによって形成される請求項2又は請求項3に記載の拘束力緩和機能を備える接続部構造。   The connecting portion having a restraining force relaxation function according to claim 2 or 3, wherein the covering layer is formed by spirally winding an anticorrosion tape made of a synthetic resin soft tape or the like around the outer peripheral portion of the connecting device. Construction. 外被層が、熱収縮合成樹脂チューブ等からなる軟質チューブを接続装置の外周部に被着することによって形成される請求項2又は請求項3に記載の拘束力緩和機能を備える接続部構造。   The connection part structure provided with a restraining force relaxation function according to claim 2 or 3, wherein the covering layer is formed by attaching a soft tube made of a heat-shrinkable synthetic resin tube or the like to the outer peripheral part of the connection device.
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