JP2009279758A - Method for producing pretension pc member - Google Patents

Method for producing pretension pc member Download PDF

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JP2009279758A
JP2009279758A JP2008130897A JP2008130897A JP2009279758A JP 2009279758 A JP2009279758 A JP 2009279758A JP 2008130897 A JP2008130897 A JP 2008130897A JP 2008130897 A JP2008130897 A JP 2008130897A JP 2009279758 A JP2009279758 A JP 2009279758A
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tension
mold
concrete
steel
steel rod
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JP5164004B2 (en
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Nobuo Kato
伸雄 加藤
Seiichi Arata
成一 荒田
Takenori Hara
健教 原
Takuo Takahashi
拓郎 高橋
Tatsuto Horiuchi
達斗 堀内
Masayoshi Koyama
雅義 小山
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PS Mitsubishi Construction Co Ltd
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<P>PROBLEM TO BE SOLVED: To make prestress introduction into the end of a PC member easy and low-cost even in the case of production by a long line method for producing a large number of PC members simultaneously when a pretension PC member is produced. <P>SOLUTION: In a PC tension material, a PC steel rod 20 cut in a necessary length per mould is used. Nuts 22 for supporting pressure positioned in mould are spirally fitted to both ends of each PC steel rod 20. PC steel rods 20 per mould 12 are coupled to each other through a separable coupling tool 26. After that, after the PC tension material made of the PC steel rods 20 connected to each other is tensed by a jack, concrete is poured. After the solidification of the concrete, the tension is released to detach the coupling tool 26. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、多数のＰＣ部材（プレストレストコンクリート部材）を同一の製作台上に並べて同時に成形するロングライン方式によるプレテンションＰＣ部材の製造方法に関する。   The present invention relates to a method for producing a pretensioned PC member by a long line method in which a large number of PC members (prestressed concrete members) are arranged on the same production table and simultaneously molded.

一般に、プレキャストコンクリート板等のＰＣ部材のロングライン方式による製造方法としては、作業台の上に多数の型枠を縁切り型枠を介して連続配置に設置し、その各型枠に連続させた状態にＰＣ緊張材を挿通し、その両端を製作台の両端に突設したアバット（反力受）に支持せて緊張し、しかる後各型枠内にコンクリートを打設し、そのコンクリートの固化を待って緊張を解除し、各型枠間に跨って繋がっているＰＣ緊張材を縁切り型枠位置で切断することによってＰＣ緊張材長さ方向に並んでいる各型枠内のコンクリートにプレストレスを導入する方法が知られている（例えば特許文献１）。   In general, as a method of manufacturing a PC member such as a precast concrete board by a long line method, a large number of molds are continuously arranged on a workbench through edge-cut molds and are continuously connected to the respective molds. PC tension material is inserted into the two, and both ends are supported by abutments (reaction force receiving) projecting from both ends of the production base, and then the concrete is placed in each formwork to solidify the concrete. Waiting to release the tension, pre-stress the concrete in each formwork lined up in the PC tendon length direction by cutting the PC tendon material straddling between each formwork at the edge cutting formwork position A method of introduction is known (for example, Patent Document 1).

また、上述したようにＰＣ部材を、縁切り型枠を介して連続配置に製造するものの他、製作台上に各ＰＣ部材毎に分かれた個別の型枠を並べて設置し、その型枠に跨って連続させた配置にＰＣ緊張材を挿通し、ＰＣ緊張材の緊張、コンクリートの打設、コンクリート固化後の緊張解除、ＰＣ緊張材の型枠間における切断の手順を経る方法が知られている（例えば特許文献２）。   Further, as described above, PC members are manufactured in a continuous arrangement through a border cutting formwork, and individual formwork divided for each PC member is placed side by side on the production stand and straddling the formwork. A method is known in which a PC tendon is inserted into a continuous arrangement, followed by procedures for tensioning the PC tendon, placing concrete, releasing the tension after solidifying the concrete, and cutting the PC tendon between the molds ( For example, Patent Document 2).

また、プレテンション方式によるＰＣ部材の製造においては、緊張解除後のＰＣ緊張材の戻り力によってプレストレスが導入されるものであるが、ＰＣ緊張材とコンクリートとの付着力に依存してプレストレスを導入させる場合は、ＰＣ部材の端部にはプレストレスが導入されないという問題がある。これを防止するものとして、コンクリート構造体の端部位置においてＰＣ緊張材に支圧具を固定しておき、ＰＣ緊張材の緊張解除後に、この支圧具を通じてＰＣ部材の端部にもプレストレスを導入させる方法が知られている（例えば特許文献３）。
特開平１０−５８４２７号号公報 特開２０００８−６６４１号公報 特開２００４−２３７５９３号公報 In addition, in the manufacture of PC members by the pretension method, prestress is introduced by the return force of the PC tendon after the tension is released, but prestress depends on the adhesion between the PC tendon and the concrete. However, there is a problem that prestress is not introduced into the end portion of the PC member. In order to prevent this, a support member is fixed to the PC tension member at the end position of the concrete structure, and after the tension of the PC tension member is released, the end of the PC member is also prestressed through the support member. There is known a method of introducing (for example, Patent Document 3).
JP-A-10-58427 Japanese Patent Laid-Open No. 20008-6641 JP 2004-237593 A

近時、図８、図９に示す如きＰＣ橋１のウエブ部材２として平板状のＰＣ部材を使用することによって箱桁の軽量化を図ると共にプレキャスト部材を使用することによる工期の短縮化を企図した方法が開発されている。このウエブ部材２は、上下方向に向けたＰＣ緊張材３が１５０ｍｍ〜２００ｍｍ程度のピッチで設置され、且つウエブ部材２の上下の端部におけるプレストレス非導入部分が短いことが好ましい。   Recently, the use of a flat PC member as the web member 2 of the PC bridge 1 as shown in FIGS. 8 and 9 is intended to reduce the weight of the box girder and shorten the construction period by using a precast member. A method has been developed. In this web member 2, it is preferable that the PC tension members 3 oriented in the vertical direction are installed at a pitch of about 150 mm to 200 mm, and the prestress non-introduced portions at the upper and lower ends of the web member 2 are short.

このようなＰＣ部材を、前述した特許文献１及び２に示されているように、多数のＰＣ部材に共通のＰＣ緊張材を使用し、同時に多数のＰＣ部材を製造するロングライン方式による方法では、ＰＣ緊張材とコンクリートとの付着によってプレストレスが導入されるようにしているため、緊張解除後におけるＰＣ緊張材のコンクリート内への戻りが防止できず、短尺のＰＣ部材の場合は、全体の長さに対するプレストレス非導入部分の長さの比率が大きくなり、好ましくないという問題がある。   As shown in Patent Documents 1 and 2 described above, such a PC member uses a common PC tension material for a large number of PC members, and at the same time uses a long line method for manufacturing a large number of PC members. Since the prestress is introduced by the adhesion between the PC tendon and the concrete, the return of the PC tendon into the concrete after releasing the tension cannot be prevented. In the case of a short PC member, There is a problem that the ratio of the length of the non-prestressed portion to the length becomes large, which is not preferable.

また、コンクリートに対するＰＣ緊張材の付着力を大きいものとするためにはＰＣストランドを使用することが好ましく、この場合、緊張解除後の戻りをなくする方法として、ＰＣ緊張材を支圧金物によってコンクリート端部に定着させる方法が考えられるが、ＰＣストランドを定着させるには、テーパー筒を半割り状にした楔によってＰＣ緊張材を挟持させる所謂楔定着によらざるを得ず、コスト高となるという問題がある。   Further, in order to increase the adhesion of the PC tendon to the concrete, it is preferable to use a PC strand. In this case, as a method for eliminating the return after releasing the tension, the PC tendon is made of concrete with a support metal. Although the method of fixing to the end portion can be considered, in order to fix the PC strand, the so-called wedge fixing in which the PC tension material is sandwiched by the wedge with the taper tube halved is inevitably expensive. There's a problem.

一方、特許文献３に示すように、ＰＣ緊張材にＰＣ鋼棒を使用し、支圧金物としてナットを使用することによってＰＣ緊張材の戻りを少なくする方法が考えられるが、これを前述したロングライン方式とする場合には、連続した鋼棒の各型枠の端部に位置する部分にナットを螺嵌しておく必要があり、例えば１００ｍ以上もの長い製作台上で、数ｍ単位のＰＣ部材を製造するような場合のように長スパンの製作台上で、多数のＰＣ部材を共通のプレテンションによって同時に製造するような場合には、予め多数のナットを所定の位置まで緊張材端部から螺嵌させておかなければならず、ＰＣ鋼棒の全長にネジ切を施したものを使用する必要があるなど、材料コスト及び作業工数上から現実的ではないという問題があった。   On the other hand, as shown in Patent Document 3, a method of reducing the return of the PC tendon by using a PC steel rod as the PC tendon and using a nut as the supporting metal can be considered. In the case of the line system, it is necessary to screw a nut into a portion located at the end of each form of a continuous steel bar. For example, on a long production table of 100 m or more, a PC of several meters When a large number of PC members are manufactured simultaneously with a common pretension on a long-span production base as in the case of manufacturing a member, a number of nuts are held in advance to a predetermined position. There is a problem that it is not realistic from the viewpoint of material cost and work man-hours, for example, it is necessary to use a PC steel rod having a full length threaded.

本発明はこのような従来の問題に鑑み、多数のＰＣ部材を共通のプレテンションによって同時に製造するロングライン方式による製造の場合においても、ＰＣ部材の端部にまでプレストレスを導入させることができ、しかもプレストレス導入時のＰＣ緊張材の戻り防止のための定着具の装着を容易かつ低コストで行うことができるプレテンションＰＣ部材の製造方法の提供を目的としてなされたものである。   In view of such a conventional problem, the present invention can introduce prestress to the end of the PC member even in the case of manufacturing by a long line method in which a large number of PC members are manufactured simultaneously by a common pretension. In addition, the present invention has been made for the purpose of providing a method of manufacturing a pretensioned PC member that can easily and inexpensively attach a fixing tool for preventing the return of the PC tendon material when prestress is introduced.

上述の如き従来の問題を解決し、所期の目的を達成するための請求項１に記載の発明の特徴は、製作台の上面に複数のＰＣ部材成形用型枠を並べ、その各型枠に貫通させて連続配置のＰＣ緊張材を挿通し、該ＰＣ緊張材の両端を前記製作台上に設置したアバットに支持させ、ジャッキにより緊張した後、前記各型枠内にコンクリートを打設し、該コンクリートの固化後に前記緊張を解くことにより前記各型枠内のコンクリートにプレストレスを導入させるプレテンションＰＣ部材の製造方法において、
前記ＰＣ緊張材には、各型枠毎に必要な長さに切断したＰＣ鋼棒を使用し、その各ＰＣ鋼棒の両端部に、前記各型枠内に位置させて支圧用のナットを螺嵌させておき、その各型枠毎のＰＣ鋼棒間を、切り離し可能な連結具を介して連結し、然る後互いに連結された前記ＰＣ鋼棒からなるＰＣ緊張材を前記ジャッキにより緊張した後、前記コンクリートの打設を行い、該コンクリートの固化後、緊張を解いた後、前記連結具を取り外すことにある。 In order to solve the conventional problems as described above and achieve the intended purpose, the invention according to claim 1 is characterized in that a plurality of molds for molding a PC member are arranged on the upper surface of a production table, and each of the molds is arranged. The PC tension material of continuous arrangement is inserted through the PC, and both ends of the PC tension material are supported by the abuts installed on the production table. After tensioning with a jack, concrete is placed in each mold. In the method for producing a pre-tension PC member in which pre-stress is introduced into the concrete in each mold by releasing the tension after the concrete is solidified,
As the PC tension material, a PC steel bar cut to a required length for each mold is used, and nuts for supporting pressure are placed at both ends of each PC steel bar in the respective molds. The PC steel bars for each formwork are connected to each other via a detachable connector, and then the PC tension members made of the PC steel bars connected to each other are tensioned by the jack. Then, the concrete is placed, and after the concrete is solidified, the tension is released, and then the connecting tool is removed.

請求項２に記載の発明の特徴は、請求項１の構成に加え、前記型枠には、底板の周囲に立上り型板を立設した箱型形状のものを使用し、該型枠の底板下に転がり部材を設置し、該型枠が前記ＰＣ緊張材の緊張作業時に該ＰＣ緊張材の長さ方向の移動に応じて移動できるようにしていることにある。   According to a second aspect of the present invention, in addition to the structure of the first aspect, the mold is a box having a rising mold around the bottom plate, and the bottom plate of the mold A rolling member is installed below, so that the formwork can be moved according to the movement of the PC tendon in the length direction during the tension work of the PC tendon.

請求項３に記載の発明の特徴は、請求項１の構成に加え、前記連結具は、前記ＰＣ鋼棒の端部に螺嵌できる袋ナットを一端側に有する一対のＰＣ鋼棒嵌合部材と、その両ＰＣ鋼棒嵌合部材間に着脱自在な枢軸によって連結される中間部材をもって構成されるものを使用することにある。   According to a third aspect of the present invention, in addition to the configuration of the first aspect, the connector is a pair of PC steel rod fitting members having a cap nut on one end side that can be screwed onto the end of the PC steel rod. And it is using the thing comprised with the intermediate member connected with the pivot axis which can be attached or detached between the both PC steel rod fitting members.

本発明においては、ＰＣ緊張材には、各型枠毎に必要な長さに切断したＰＣ鋼棒を使用し、その各ＰＣ鋼棒の両端部に、前記各型枠内に位置させて支圧用のナットを螺嵌させておき、その各型枠毎のＰＣ鋼棒間を、切り離し可能な連結具を介して連結し、然る後互いに連結された前記ＰＣ鋼棒からなるＰＣ緊張材を前記ジャッキにより緊張した後、前記コンクリートの打設を行い、該コンクリートの固化後、緊張を解いた後、前記連結具を取り外すようにしているため、ロングライン方式により多数のＰＣ部材を同時に製造する場合においても、プレストレス導入時に支圧用のナツトの存在によってＰＣ鋼棒の戻りがなくなり、ＰＣ部材の端部にまでプレストレスを導入させることができるとともに、型枠毎に対応させたＰＣ鋼棒を連結してこれらを同時に緊張するものであるため、支圧用のナットの取り付け作業が容易となり、また両端部にのみ雄ネジを有するＰＣ鋼棒が使用でき、且つ使用した連結具は、次のＰＣ部材製造に繰り返し使用できるため、コストが低減される。   In the present invention, a PC steel bar cut to a required length for each mold is used as the PC tendon, and the PC steel bar is supported at both ends of each PC steel bar by being positioned in the mold. A nut for pressure is screwed, and the PC steel bars for each formwork are connected to each other via a detachable connector, and then the PC tension members made of the PC steel bars connected to each other are connected. After tensioning with the jack, the concrete is placed, and after the concrete is solidified, the tension is released, and then the connector is removed, so a large number of PC members are manufactured simultaneously by the long line method. Even in the case, the PC steel rod does not return due to the presence of the nut for supporting when prestress is introduced, and the prestress can be introduced to the end of the PC member, and the PC steel rod corresponding to each formwork Concatenate Since these are tensioned at the same time, it is easy to install nuts for bearing, and PC steel bars with male threads only at both ends can be used. The cost can be reduced because it can be used repeatedly.

また、本発明では、前記型枠には、底板の周囲に立上り型板を立設した箱型形状のものを使用し、該型枠の底板下に転がり部材を設置し、該型枠が前記ＰＣ緊張材の緊張作業時に該ＰＣ緊張材の長さ方向の移動に応じて移動できるようにすることによって、緊張作業時におけるＰＣ鋼棒連結部の遊びやＰＣ鋼棒の伸びに起因する連結具及び支圧用のナット位置の変動に対し、型枠全体がこれに追随して移動するため、各型枠毎のＰＣ鋼棒に均一な緊張力を付与することができる。   Further, in the present invention, the mold is a box-shaped one in which a rising mold is erected around the bottom plate, a rolling member is installed below the bottom plate of the mold, and the mold is By allowing the PC tendon to move according to the movement in the length direction of the PC tendon, the connecting tool caused by the play of the PC steel bar connecting portion and the elongation of the PC steel bar during the tension work In addition, since the entire formwork moves following the change in the nut position for supporting pressure, a uniform tension can be applied to the PC steel rod for each formwork.

請求項３に記載の発明の特徴は、請求項１の構成に加え、前記連結具は、前記ＰＣ鋼棒の端部に螺嵌できる袋ナットを一端側に有する一対のＰＣ鋼棒嵌合部材と、その両ＰＣ鋼棒嵌合部材間に着脱自在な枢軸によって連結される中間部材をもって構成されるものを使用することにより、ＰＣ鋼棒連結、切り離しの作業が容易に行われる。   According to a third aspect of the present invention, in addition to the configuration of the first aspect, the connector is a pair of PC steel rod fitting members having a cap nut on one end side that can be screwed onto the end of the PC steel rod. And using the thing comprised with the intermediate member connected by the pivot axis which can be attached or detached between the both PC steel rod fitting members, the operation | work of PC steel rod connection and isolation | separation is performed easily.

次に本発明の実施の形態を、図１〜図７に示した実施例に基づいて説明する。図において符号１０は、プレテンションＰＣ部材をロングライン方式により製造するための製作台であり、１１は製作台１０の両端部に設置したアバット、１２はＰＣ部材形成用の型枠である。     Next, embodiments of the present invention will be described based on the examples shown in FIGS. In the figure, reference numeral 10 denotes a production base for producing a pretensioned PC member by a long line method, 11 denotes an abut placed at both ends of the production base 10, and 12 denotes a mold for forming a PC member.

先ず、図１に示すように、製作台１０のアバット１１，１１間に所定数の型枠１２を並べる。この型枠１２は図２に示すように、方形状をした底板１３の周縁に側板１４，１４及び端板１５，１５からなる立ち上がり型板を取り外し可能に立ち上げた平箱状をしており、端板１５を互いにアバット１１，１１間方向に対向させて多数の型枠１２を並べる。この型枠１２の底板１３下には、鋼棒からなる複数の転がり部材１６をアバット１１，１１間方向に直交する向きにして敷設しておく。   First, as shown in FIG. 1, a predetermined number of molds 12 are arranged between the abutments 11 of the production base 10. As shown in FIG. 2, the mold 12 has a flat box shape in which a rising mold plate including side plates 14 and 14 and end plates 15 and 15 is detachably raised on the periphery of a rectangular bottom plate 13. A large number of molds 12 are arranged with the end plates 15 facing each other in the direction between the abutments 11 and 11. A plurality of rolling members 16 made of steel bars are laid under the bottom plate 13 of the mold 12 in a direction orthogonal to the direction between the abutments 11 and 11.

各型枠１２には、所定のピッチに所望数のＰＣ鋼棒２０を平行に並べて設置する。このＰＣ鋼棒２０は、両端が型枠１２の端板１５，１５より突出し、後述する連結具２５が型枠１２外において嵌合できる長さのものを使用する。また、このＰＣ鋼棒２０には、図６、図７に示すように両端部から型枠１２内に至る長さの雄ネジ２１が刻設されている。この両雄ネジ２１部分に定着金物を構成する支圧用のナット２２，２２を螺嵌させる。このナット２２は、型枠１２の端板１５の内側に位置させる。   Each mold 12 is provided with a desired number of PC steel bars 20 arranged in parallel at a predetermined pitch. The PC steel rod 20 is of such a length that both ends protrude from the end plates 15 and 15 of the mold 12 and a connector 25 described later can be fitted outside the mold 12. Further, as shown in FIGS. 6 and 7, a male screw 21 having a length extending from both ends to the inside of the mold 12 is engraved on the PC steel bar 20. Nuts 22 and 22 for supporting pressure constituting the fixing hardware are screwed into both male screw 21 portions. The nut 22 is positioned inside the end plate 15 of the mold 12.

次いで、各型枠１２，１２間において、互いに対向する端板１５，１５より突出している各ＰＣ鋼棒２０，２０……間を連結する。この連結には図６、図７に示す連結具２５を使用する。この連結具２５は、一対のＰＣ鋼棒嵌合部材２６，２６とそれらを連結する中間部材２７とから構成されている。   Next, between the molds 12 and 12, the PC steel bars 20, 20... Projecting from the end plates 15 and 15 facing each other are connected. For this connection, a connector 25 shown in FIGS. 6 and 7 is used. The connector 25 includes a pair of PC steel rod fitting members 26 and 26 and an intermediate member 27 that connects them.

ＰＣ鋼棒嵌合部材２６は、棒状材２６ａの一端にこれと一体の袋ナット２６ｂを有し、他端に二股状をした一対の枢着片２６ｃ，２６ｃを有しており、両枢着片２６ｃ，２６ｃには連通配置の枢軸嵌合孔が形成されている。中間部材２７は略矩形状をしたリンクからなり、その両端に枢軸嵌合孔が形成されている。この中間部材２７の両端を両ＰＣ鋼棒嵌合部材２６，２６の各枢着片２６ｃ，２６ｃ間に挿入し、枢軸２８をこれらに貫通させて装着することによって両ＰＣ鋼棒嵌合部材２６，２６が連結されるようになっている。   The PC steel rod fitting member 26 has a cap nut 26b integral with one end of a rod-like member 26a, and has a pair of pivoting pieces 26c, 26c which are bifurcated at the other end. The pieces 26c and 26c are formed with pivot fitting holes which are arranged in communication. The intermediate member 27 is formed of a link having a substantially rectangular shape, and pivot fitting holes are formed at both ends thereof. Both PC steel rod fitting members 26 are inserted by inserting both ends of this intermediate member 27 between the pivot attachment pieces 26c, 26c of both PC steel rod fitting members 26, 26, and passing the pivot 28 through them. , 26 are connected.

尚、枢軸２８は、一端に前記枢軸嵌合孔より太径の頭部２８ａが形成され、他端には割りピン貫通孔が形成され、これに割りピン２９を挿通させることによって枢軸嵌合孔から抜け止めさせている。この抜け止めは、割りピンの他、Ｃリング等各種の抜け止め具が使用できる。   The pivot 28 has a head 28a having a diameter larger than that of the pivot fitting hole at one end and a split pin through hole formed at the other end. By inserting a split pin 29 therethrough, the pivot fitting hole is inserted. To prevent it from coming off. In addition to the split pin, various retainers such as a C ring can be used for the retainer.

このようにしてアバット１１，１１間に並べられた型枠１２，１２……毎に設置したＰＣ鋼棒２０，２０……間を連結具２５によって連結した後、両端部の型枠のＰＣ鋼棒の先端をアバット１１，１１に貫通させ、その一方をナットからなる定着具３０により一方のアバット１１に対して定着させ、他方をアバット１１に支持させた緊張用ジャッキ３１に定着させる。この状態で緊張用ジャッキ３１により多数連結したＰＣ鋼棒２０，２０……を緊張する。この時の連結具２５の遊び部分、及びＰＣ鋼棒２０の伸びによって連結具２５の位置が変動するが、この変動は型枠１２が転がり部材１６上をこれに追随して移動することによって吸収され、型枠１２に対するＰＣ鋼棒２０及びナット２２の相対位置関係に変動は生じない。   In this way, the PC steel rods 20, 20... Installed between the molds 12, 12... Arranged between the abuts 11 and 11 are connected by the connector 25, and then the PC steel of the molds at both ends. The tip of the bar is passed through the abuts 11, 11, one of which is fixed to one abut 11 by a fixing tool 30 made of a nut, and the other is fixed to a tension jack 31 supported by the abut 11. In this state, the PC steel bars 20, 20,. At this time, the position of the connector 25 fluctuates due to the play portion of the connector 25 and the elongation of the PC steel rod 20, but this variation is absorbed by the movement of the mold frame 12 following the rolling member 16. Thus, the relative positional relationship between the PC steel bar 20 and the nut 22 with respect to the mold 12 does not vary.

このようにしてＰＣ鋼棒２０を緊張した状態で、各型枠１２内にコンクリート３２を打設し（図３に示す）、その固化後緊張用ジャッキ３１による緊張を解除する。これによって各型枠１２内のコンクリートにプレストレスが導入される。このプレストレスは各型枠１２毎にそのＰＣ鋼棒２０の両端にナット２２が設置されているため、これがプレストレス導入用の支圧金物となり、製造されるＰＣ部材の端部にまでプレストレスが導入される。   In this manner, with the PC steel rod 20 being in tension, concrete 32 is placed in each mold 12 (shown in FIG. 3), and the tension by the tension jack 31 after solidification is released. This introduces prestress into the concrete in each mold 12. Since this prestress is provided with nuts 22 at both ends of the PC steel bar 20 for each mold 12, this becomes a support metal for introducing prestress, and the prestress extends to the end of the PC member to be manufactured. Is introduced.

次いで、各型枠１２間の連結具２５を取り外す（図４に示す）。この取り外しは、先ず割りピン２９を抜き取り、枢軸２８の先端を、適宜の押し出し冶具を介してハンマーにて叩くことにより枢軸２８を除去し、中間部材２７を両ＰＣ鋼棒嵌合部材２６，２６から取り外す。しかる後袋ナット２６ｂをＰＣ鋼棒２０から取り外す。   Next, the connector 25 between the molds 12 is removed (shown in FIG. 4). In this removal, first, the split pin 29 is pulled out, and the pivot 28 is removed by hitting the tip of the pivot 28 with a hammer through an appropriate pushing jig, and the intermediate member 27 is fitted to both PC steel rod fitting members 26, 26. Remove from. Thereafter, the cap nut 26b is removed from the PC steel rod 20.

また、袋ナット２６ｂのＰＣ鋼棒２０からの取り外し前又は後に、ＰＣ鋼棒２０のＰＣ部材Ａから突出している部分を必要に応じて除去し、脱型する（図５に示す）。尚、ＰＣ鋼棒２０の突出部分の除去は脱型後に行ってもよい。   Further, before or after removing the cap nut 26b from the PC steel rod 20, the portion protruding from the PC member A of the PC steel rod 20 is removed as necessary and removed (as shown in FIG. 5). The protruding portion of the PC steel bar 20 may be removed after demolding.

本発明に係るプレテンションＰＣ部材の製造方法に使用する装置の概略構成を示す側面図である。It is a side view which shows schematic structure of the apparatus used for the manufacturing method of the pretension PC member which concerns on this invention. 同上の型枠及びＰＣ鋼棒の配置を示す平面図である。It is a top view which shows arrangement | positioning of a formwork same as the above, and PC steel rod. 同上の型枠内にコンクリートを打設した状態を示す平面図である。It is a top view which shows the state which laid concrete in the same formwork as the above. 同上の連結具によるＰＣ鋼棒間の連結を解いた状態を示す平面図である。It is a top view which shows the state which open | released the connection between PC steel bars by the connection tool same as the above. 同上の脱型後の状態を示す平面図である。It is a top view which shows the state after demolding same as the above. 同上の連結具によるＰＣ鋼棒間連結状態を示す部分拡大断面図である。It is a partial expanded sectional view which shows the connection state between PC steel bars by the connection tool same as the above. 同平面図である。It is the same top view. 本発明方法により製造されるＰＣ部材の一例のウエブを使用した橋体の部分断面図である。It is a fragmentary sectional view of the bridge body using the web of an example of the PC member manufactured by the method of the present invention. 同上のウエブの平面図である。It is a top view of a web same as the above.

符号の説明Explanation of symbols

１０ 製作台
１１ アバット
１２ ＰＣ部材形成用の型枠
１３ 底板
１４ 側板
１５ 端板
１６ 転がり部材
２０ ＰＣ鋼棒
２１ 雄ネジ
２２ ナット
２５ 連結具
２６ ＰＣ鋼棒嵌合部材
２６ａ 棒状材
２６ｂ 袋ナット
２６ｃ 枢着片
２７ 中間部材
２８ 枢軸
２８ａ 頭部
２９ 割りピン
３０ 定着具
３１ 緊張用ジャッキ
Ａ ＰＣ部材 DESCRIPTION OF SYMBOLS 10 Production stand 11 Abut 12 Form for PC member formation 13 Bottom plate 14 Side plate 15 End plate 16 Rolling member 20 PC steel rod 21 Male screw 22 Nut 25 Connector 26 PC steel rod fitting member 26a Rod-shaped member 26b Cap nut 26c Pivot Contact piece 27 Intermediate member 28 Axis 28a Head 29 Split pin 30 Fixing tool 31 Jack for tension A PC member

Claims (3)

製作台の上面に複数のＰＣ部材成形用型枠を並べ、その各型枠に貫通させて連続配置のＰＣ緊張材を挿通し、該ＰＣ緊張材の両端を前記製作台上に設置したアバットに支持させ、ジャッキにより緊張した後、前記各型枠内にコンクリートを打設し、該コンクリートの固化後に前記緊張を解くことにより前記各型枠内のコンクリートにプレストレスを導入させるプレテンションＰＣ部材の製造方法において、
前記ＰＣ緊張材には、各型枠毎に必要な長さに切断したＰＣ鋼棒を使用し、その各ＰＣ鋼棒の両端部に、前記各型枠内に位置させて支圧用のナットを螺嵌させておき、その各型枠毎のＰＣ鋼棒間を、切り離し可能な連結具を介して連結し、然る後互いに連結された前記ＰＣ鋼棒からなるＰＣ緊張材を前記ジャッキにより緊張した後、前記コンクリートの打設を行い、該コンクリートの固化後、緊張を解いた後、前記連結具を取り外すことを特徴としてなるプレテンションＰＣ部材の製造方法。 A plurality of PC member forming molds are arranged on the upper surface of the production table, and PC tension members arranged continuously through the respective mold frames are inserted, and both ends of the PC tension material are attached to the abuts installed on the production table. A pre-tension PC member that is supported and tensioned by a jack, and then a concrete is placed in each mold, and a prestress is introduced into the concrete in each mold by releasing the tension after the concrete is solidified. In the manufacturing method,
As the PC tension material, a PC steel bar cut to a required length for each mold is used, and nuts for supporting pressure are placed at both ends of each PC steel bar in the respective molds. The PC steel bars for each formwork are connected to each other via a detachable connector, and then the PC tension members made of the PC steel bars connected to each other are tensioned by the jack. Then, after the concrete is placed, the concrete is solidified, the tension is released, and then the connecting tool is removed. 前記型枠には、底板の周囲に立上り型板を立設した箱型形状のものを使用し、該型枠の底板下に転がり部材を設置し、該型枠が前記ＰＣ緊張材の緊張作業時に該ＰＣ緊張材の長さ方向の移動に応じて移動できるようにしている請求項１に記載のプレテンションＰＣ部材の製造方法。   As the mold, a box-shaped one in which a rising mold is erected around the bottom plate is used, a rolling member is installed under the bottom plate of the mold, and the mold is used to tension the PC tension material. 2. The method of manufacturing a pretension PC member according to claim 1, wherein the PC tension member is sometimes moved according to the movement in the length direction. 前記連結具は、前記ＰＣ鋼棒の端部に螺嵌できる袋ナットを一端側に有する一対のＰＣ鋼棒嵌合部材と、その両ＰＣ鋼棒嵌合部材間に着脱自在な枢軸によって連結される中間部材をもって構成されるものを使用する請求項１に記載のプレテンションＰＣ部材の製造方法。   The connector is connected by a pair of PC steel rod fitting members having a cap nut on one end side that can be screwed onto the end of the PC steel rod, and a pivot shaft that is detachable between the PC steel rod fitting members. The manufacturing method of the pretension PC member of Claim 1 which uses what is comprised with an intermediate member.
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CN102319838A (en) * 2011-07-01 2012-01-18 柳忠林 Method for cutting prestressed steel bars of cement board
CN102581951A (en) * 2012-03-26 2012-07-18 中铁二十一局集团路桥工程有限公司 Device for mounting prestress perforation rubber bar
JP2014008649A (en) * 2012-06-28 2014-01-20 Taisei Corp Formwork structure
JP2016216981A (en) * 2015-05-19 2016-12-22 株式会社ピーエス三菱 Manufacturing method and construction method for precast concrete member
JP2017002574A (en) * 2015-06-11 2017-01-05 株式会社ピーエス三菱 Precast concrete member manufacturing method and construction method
WO2018133857A1 (en) * 2017-01-23 2018-07-26 山西高行液压股份有限公司 Tension release device for production line with pipelining units for pre-tensioned high-speed railway track slab
CN109016086A (en) * 2018-08-15 2018-12-18 张家港市岳晟源金属制品有限公司 Prestressed solid square pile arranges mould and square pile processing method
CN109093839A (en) * 2018-08-10 2018-12-28 中国华西企业股份有限公司 A kind of presstressed reinforcing steel stretching structure for pre-stress floor
JP2019023381A (en) * 2017-07-21 2019-02-14 大成建設株式会社 Precast concrete member, manufacturing method for the same, and road bridge
CN109343591A (en) * 2018-09-15 2019-02-15 北京市建筑工程研究院有限责任公司 Post-tensioned prestressing tensioning Precise control device and method based on intelligent steel strand
KR20190103595A (en) * 2018-02-28 2019-09-05 김준영 Sliding Stand and Prestressed Concrete Beam Manufacturing Method
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CN102581951A (en) * 2012-03-26 2012-07-18 中铁二十一局集团路桥工程有限公司 Device for mounting prestress perforation rubber bar
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CN109343591A (en) * 2018-09-15 2019-02-15 北京市建筑工程研究院有限责任公司 Post-tensioned prestressing tensioning Precise control device and method based on intelligent steel strand
CN112847775A (en) * 2021-03-01 2021-05-28 中铁二十三局集团第四工程有限公司 Be used for prefabricated reinforcement bed-jig of component

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