JP5667020B2 - Formwork structure - Google Patents

Formwork structure Download PDF

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JP5667020B2
JP5667020B2 JP2011205214A JP2011205214A JP5667020B2 JP 5667020 B2 JP5667020 B2 JP 5667020B2 JP 2011205214 A JP2011205214 A JP 2011205214A JP 2011205214 A JP2011205214 A JP 2011205214A JP 5667020 B2 JP5667020 B2 JP 5667020B2
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formwork
column
pillar
mold
flange
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JP2013067024A (en
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克浩 大竹
克浩 大竹
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Taisei Corp
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Description

本発明はアンテナを支持する塔状構造物を構成する柱構成部材の製造技術に関する。   The present invention relates to a technique for manufacturing a column constituting member constituting a tower-like structure that supports an antenna.

アンテナを支持する塔状構造物のうち、特にパラボラアンテナ等を支持する塔状構造物は、その振れが少ないことが必要とされる。このため、塔状構造物には高い剛性が要求される。剛性を確保するため、従来では鉄骨トラス構造等の鉄骨造が採用されることが多い（特許文献１）。しかし、鉄骨造とするとコストが高く、工期も長くなりやすい。   Among tower-like structures that support antennas, tower-like structures that support parabolic antennas and the like are particularly required to have less vibration. For this reason, high rigidity is required for the tower-like structure. Conventionally, a steel structure such as a steel truss structure is often used to ensure rigidity (Patent Document 1). However, the steel structure is expensive and the construction period tends to be long.

特開平９−２９１９６８号公報Japanese Patent Laid-Open No. 9-291968

コストと工期の点で、高強度コンクリートを遠心締固めによって製造したコンクリート（ＰＨＣ）製又はコピタ型プレテンション式高強度プレストレスト鉄筋コンクリート（ＰＲＣ）製の柱部材を上下に連結して塔状構造物を構築する方法が考えられる。この方法であれば、鉄骨造の場合に比べてコストを削減でき、また、工期の短縮化も図り得る。   In terms of cost and construction period, a columnar structure is made by connecting up and down pillars made of concrete (PHC) made by centrifugal compaction of high-strength concrete or copier type pretension type high-strength prestressed reinforced concrete (PRC). A method of building is conceivable. If this method is used, the cost can be reduced as compared with the case of a steel structure, and the construction period can be shortened.

柱部材間の連結には、建て入れ調整が可能となる点で、柱部材の端部にフランジ継手タイプの連結部材を設けてボルト締結することが好ましい。ここで、フランジ継手タイプの連結部材を既製の柱部材に装着して固定する方式とすると、その組み付け作業が必要となって製造効率の点で好ましくない。   In connection between the column members, it is preferable that a flange joint type connection member is provided at an end portion of the column member and bolted in order to enable adjustment of erection. Here, if the flange joint type connecting member is mounted on and fixed to a ready-made column member, the assembly work is required, which is not preferable in terms of manufacturing efficiency.

本発明の目的は、柱部材と連結部材とを一体的に製造可能とする型枠構造を提供することにある。   An object of the present invention is to provide a formwork structure that enables a column member and a connecting member to be integrally manufactured.

本発明によれば、アンテナを支持する柱状の塔状構造物を構成する柱構成部材を製造するための型枠構造であって、前記柱構成部材が、ＰＨＣ又はＰＲＣ製の柱部材と、前記柱部材の一方の端部に設けられ、隣接する別の前記柱構成部材を連結するための連結部材と、を備え、前記連結部材が、前記柱部材の端部を囲む環状部と、前記環状部に接続され、他の前記柱構成部材と連結されるフランジ部と、を備え、前記型枠構造は、前記柱部材を構成する鉄筋籠を囲む第１型枠と、前記第１型枠と、前記フランジ部の外側に配置され、プレテンション力を負担する緊張端側の支持部材と、の間に介在し、前記連結部材がプレテンション力の作用方向に変位可能に、前記フランジ部及び緊張端側のエンドプレートを囲む第２型枠と、を備え、前記第２型枠は前記第１型枠に分離可能に固定されることを特徴とする型枠構造が提供される。 According to the present invention, there is provided a formwork structure for manufacturing a column constituting member that constitutes a columnar tower-like structure that supports an antenna, wherein the column constituting member is a column member made of PHC or PRC; A connecting member that is provided at one end of the pillar member and connects another adjacent pillar component member, the annular member surrounding the end of the pillar member, and the annular member And a flange portion connected to the other pillar component member, and the mold structure includes a first mold frame surrounding a reinforcing bar cage constituting the pillar member, and the first mold frame. , Disposed on the outside of the flange portion, and interposed between the support member on the tension end side that bears the pretension force, and the connecting member is displaceable in the acting direction of the pretension force. comprising a second type frame surrounding the end plate of the end side, the said Type 2 frame formwork structure, characterized in that it is detachably secured to the first-type frame is provided.

また、本発明によれば、アンテナを支持する柱状の塔状構造物を構成する柱構成部材を製造するための型枠構造であって、前記柱構成部材が、ＰＨＣ又はＰＲＣ製の柱部材と、前記柱部材の一方の端部に設けられ、隣接する別の前記柱構成部材を連結するための連結部材と、を備え、前記連結部材が、前記柱部材の端部を囲む環状部と、前記環状部に接続され、他の前記柱構成部材と連結されるフランジ部と、前記環状部の周囲に複数設けられ、前記環状部と前記フランジ部とに接続された補強リブ部と、を備え、前記型枠構造は、前記柱部材を構成する鉄筋籠を囲む第１型枠と、前記第１型枠と、前記フランジ部の外側に配置され、プレテンション力を負担する固定端側のエンドプレートと、の間に介在し、前記フランジ部及び前記補強リブ部を囲む第２型枠と、を備えたことを特徴とする型枠構造が提供される。   Further, according to the present invention, there is provided a formwork structure for manufacturing a column constituting member that constitutes a columnar tower-like structure that supports an antenna, wherein the column constituting member is a column member made of PHC or PRC. A connecting member that is provided at one end of the pillar member and connects another adjacent pillar component member, and the connecting member surrounds the end of the pillar member, A flange portion connected to the annular portion and connected to the other pillar component member, and a plurality of reinforcing rib portions provided around the annular portion and connected to the annular portion and the flange portion. The mold structure includes a first mold frame that surrounds the reinforcing rods constituting the pillar member, the first mold frame, and an end on the fixed end side that is disposed outside the flange portion and bears a pretension force. Between the flange portion and the reinforcing rib. A second type frame surrounding the part, mold structure comprising the is provided.

本発明によれば、柱部材と連結部材とを一体的に製造可能とする型枠構造を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the formwork structure which can manufacture a pillar member and a connection member integrally can be provided.

（Ａ）は塔状構造物の概略図、（Ｂ）は該塔状構造物の分解図。(A) is the schematic of a tower-like structure, (B) is an exploded view of this tower-like structure. （Ａ）は図１（Ａ)の線Ｉ−Ｉに沿う断面図、（Ｂ）は連結部材の斜視図。(A) is sectional drawing which follows the line II of FIG. 1 (A), (B) is a perspective view of a connection member. （Ａ)は本発明の一実施形態に係る型枠構造の断面図、（Ｂ）は型枠の斜視図。(A) is sectional drawing of the formwork structure which concerns on one Embodiment of this invention, (B) is a perspective view of a formwork. 本発明の別実施形態に係る型枠構造の断面図。Sectional drawing of the formwork structure which concerns on another embodiment of this invention.

はじめに、本発明の実施形態に係る型枠構造により製造される柱構成部材を用いた塔状構造物について説明する。図１（Ａ）は塔状構造物Ａの概略図、図１（Ｂ）は塔状構造物Ａの柱体１の分解図である。塔状構造物Ａは複数の柱構成部材１０、２０、３０を上下に連結した柱体１を備える。本例では３つの柱構成部材１０、２０、３０を連結して柱体１を構成しているが４以上の柱構成部材を連結して構成してもよく、また、２つの柱構成部材を連結して構成してもよい。   First, the tower-like structure using the column component manufactured by the formwork structure according to the embodiment of the present invention will be described. 1A is a schematic view of the tower-like structure A, and FIG. 1B is an exploded view of the column 1 of the tower-like structure A. FIG. The tower-like structure A includes a pillar body 1 in which a plurality of pillar constituent members 10, 20, and 30 are connected vertically. In this example, three pillar constituent members 10, 20, and 30 are connected to constitute the pillar body 1. However, four or more pillar constituent members may be connected to each other. You may comprise and comprise.

柱構成部材１０、２０、３０は、柱構成部材１０が最下部に位置し、柱構成部材３０が最上部に位置し、柱構成部材２０が中間部に位置している。柱構成部材３０にはアンテナ取付具３５が固定されており、パラボラアンテナ等のアンテナ（不図示）がアンテナ取付具３５を介して支持される。柱構成部材１０はその下部が鉄筋コンクリート造の基礎２に埋め込まれており、基礎２は柱体１全体を支持する。   The column component members 10, 20, and 30 are such that the column component member 10 is positioned at the bottom, the column component member 30 is positioned at the top, and the column component member 20 is positioned at the middle. An antenna fixture 35 is fixed to the column component 30, and an antenna (not shown) such as a parabolic antenna is supported via the antenna fixture 35. The lower part of the column component 10 is embedded in a reinforced concrete foundation 2, and the foundation 2 supports the entire column body 1.

本例の場合、柱体１の地上高としては、３０ｍ程度を想定しており、基礎２による柱体１の支持モデルは固定モデルである場合を想定している。しかし、支持モデルをピン形式とし、コンクリート基礎２は柱体１の鉛直荷重のみを支持する一方、柱体１と基礎２との間にケーブルを張設して柱体１の傾倒を防止する構成でもよい。   In this example, the ground height of the column 1 is assumed to be about 30 m, and the support model of the column 1 based on the foundation 2 is assumed to be a fixed model. However, the support model is in the form of a pin, and the concrete foundation 2 supports only the vertical load of the column 1 while a cable is stretched between the column 1 and the foundation 2 to prevent the column 1 from being tilted. But you can.

柱構成部材１０、２０、３０は、それぞれ、ＰＲＣ製で円筒の柱部材１１、２１、３１を基本的な構成要素としている。ＰＲＣは剛性が高いため、それにより柱体１をより細くしながら、振れを少なくすることができる。これは、材料削減に役立つと共に塔状構造物Ａの周辺の景観を損なうことを低減できる。また、柱部材１１、２１、３１を円筒とすることができ、中実の場合よりも軽量化を図れる。なお、本例では柱部材１１、２１、３１をＰＲＣ製としたがＰＨＣ製としてもよい。また、例えば、最上部に位置する柱構成部材を鉄骨造としてもよい。   The pillar constituent members 10, 20, and 30 are made of PRC and have cylindrical pillar members 11, 21, and 31 as basic constituent elements, respectively. Since the PRC has high rigidity, it is possible to reduce vibration while making the column 1 thinner. This is useful for material reduction and can reduce damage to the surrounding landscape of the tower-like structure A. Moreover, the pillar members 11, 21, and 31 can be made into a cylinder, and weight reduction can be attained compared with the case of a solid. In this example, the pillar members 11, 21, and 31 are made of PRC, but may be made of PHC. In addition, for example, the pillar constituent member located at the top may be a steel structure.

本例の場合、柱体１はその下側から上側へ向かって段階的に縮径している。具体的には、縮径部位１ａ、１ｂにおいて２段階で縮径している。本例では２段階で縮径した構成としたが３段階以上としてもよい。縮径部位は、それぞれ、柱部材２１、３１の途中の部位となっている。   In the case of this example, the diameter of the column 1 is gradually reduced from the lower side toward the upper side. Specifically, the diameter is reduced in two stages at the reduced diameter portions 1a and 1b. In this example, the diameter is reduced in two stages, but three or more stages may be used. The reduced diameter portion is a portion in the middle of the column members 21 and 31, respectively.

柱部材１１は、全体としてその径（外径）が軸方向に同径となっており、柱部材２１の下部２２と外径が同径である。柱部材１１の下端部には端板１６が設けられており、また、柱部材１１の下部は金属製（例えば鋼製）の環状部１７により囲まれている。環状部１７は円筒形状をなしており、柱部材１１の下部のコンクリート１２を拘束してその強度を向上する。なお、柱部材１１、２１、３１の周面にはフィーダ線等の付属物を設置するためのインサート（不図示）を複数個所において埋め込まれている。   The column member 11 as a whole has the same diameter (outer diameter) in the axial direction, and the outer diameter of the lower portion 22 of the column member 21 is the same. An end plate 16 is provided at the lower end of the column member 11, and the lower portion of the column member 11 is surrounded by an annular portion 17 made of metal (for example, steel). The annular portion 17 has a cylindrical shape and restrains the concrete 12 below the column member 11 to improve its strength. In addition, inserts (not shown) for installing accessories such as feeder wires are embedded in the peripheral surfaces of the pillar members 11, 21, and 31 at a plurality of locations.

柱部材２１は、下部２２と、上部２３と、これらの間の径変化部２４と、を備える。下部２２、上部２３は、それぞれ、その径（外径）が軸方向に同径であるが、上部２３は下部２２よりも小径となっている。径変化部２４は、下部２２と上部２３との径の差を埋める部分をなしており、この径変化部２４は縮径部位１ａを構成している。径変化部２４は、本例の場合、応力集中を避ける点で、急激に径が変化する段差状とせず、徐々に径が変化したテーパ状としている。   The column member 21 includes a lower part 22, an upper part 23, and a diameter changing part 24 between them. The lower portion 22 and the upper portion 23 have the same diameter (outer diameter) in the axial direction, but the upper portion 23 has a smaller diameter than the lower portion 22. The diameter changing portion 24 forms a portion that fills the difference in diameter between the lower portion 22 and the upper portion 23, and this diameter changing portion 24 constitutes a reduced diameter portion 1a. In the case of this example, the diameter changing portion 24 is not a stepped shape in which the diameter is suddenly changed but a tapered shape in which the diameter is gradually changed in order to avoid stress concentration.

柱部材３１は、柱部材２１と同様の構造を有している。すなわち、柱部材３１は、下部３２と、上部３３と、これらの間の径変化部３４と、を備える。下部３２、上部３３は、それぞれ、その径（外径）が軸方向に同径であるが、上部３３は下部３２よりも小径となっている。下部３２は柱部材２１の上部２３と外径が同径である。径変化部３４は、下部３２と上部３３との径の差を埋める部分をなしており、この径変化部３４は縮径部位１ｂを構成している。径変化部３４は、本例の場合、応力集中を回避するため、急激に径が変化する段差状とせず、徐々に径が変化したテーパ状としている。   The column member 31 has the same structure as the column member 21. That is, the column member 31 includes a lower part 32, an upper part 33, and a diameter changing part 34 between them. The lower portion 32 and the upper portion 33 have the same diameter (outer diameter) in the axial direction, but the upper portion 33 has a smaller diameter than the lower portion 32. The lower part 32 has the same outer diameter as the upper part 23 of the column member 21. The diameter changing portion 34 forms a portion that fills the difference in diameter between the lower portion 32 and the upper portion 33, and this diameter changing portion 34 constitutes a reduced diameter portion 1b. In this example, in order to avoid stress concentration, the diameter changing portion 34 does not have a step shape in which the diameter suddenly changes, but has a tapered shape in which the diameter gradually changes.

柱部材１１と柱部材２１とは、フランジ継手タイプの連結部材４０、４０を介して連結されている。図２（Ａ)は図１（Ａ）の線Ｉ−Ｉに沿う断面図、図２（Ｂ)は連結部材４０の斜視図である。   The column member 11 and the column member 21 are connected to each other via flange joint type connecting members 40 and 40. 2A is a cross-sectional view taken along line II in FIG. 1A, and FIG. 2B is a perspective view of the connecting member 40. FIG.

図２（Ｂ）を参照して連結部材４０は、金属製（例えば鋼製）の部材であって、円筒状の環状部４１と、環状部４１の端面に接続された端板４２と、を備える。端板４２の一部は、環状部４１の径方向外方に突出したフランジ部４２’を構成している。フランジ部４２’にはボルト穴４４が複数設けられている。   Referring to FIG. 2B, the connecting member 40 is a metal (for example, steel) member, and includes a cylindrical annular portion 41 and an end plate 42 connected to the end surface of the annular portion 41. Prepare. A part of the end plate 42 forms a flange portion 42 ′ protruding outward in the radial direction of the annular portion 41. A plurality of bolt holes 44 are provided in the flange portion 42 '.

本例の場合、連結部材４０は、更に、補強リブ４３を備える。補強リブ４３は環状部４１の周囲に複数設けられ、環状部４１とフランジ部４２’とに接続されている。補強リブ４３を設けたことで連結部材４０の強度と剛性の向上を図ることができる。   In the case of this example, the connecting member 40 further includes a reinforcing rib 43. A plurality of reinforcing ribs 43 are provided around the annular portion 41, and are connected to the annular portion 41 and the flange portion 42 '. By providing the reinforcing rib 43, the strength and rigidity of the connecting member 40 can be improved.

図２（Ａ）を参照して、連結部材４０は柱部材２１の下端部と、柱部材１１の上端部とにそれぞれ設けられている。   Referring to FIG. 2A, the connecting members 40 are provided at the lower end portion of the column member 21 and the upper end portion of the column member 11, respectively.

柱部材２１は、内部空間２１ａを有して円筒状のコンクリート部２５と、コンクリート部２５内に埋設されている主筋２７、帯筋２８、ＰＣ鋼線２６と、を備える。ＰＣ鋼線２６の下端は柱部材２１側の連結部材４０の端板４２に連結されている。なお、ＰＣ鋼線２６の上端は柱部材２１の上部に設けられる連結部材５０に連結されている。   The column member 21 includes an internal space 21 a and a cylindrical concrete portion 25, and a main reinforcement 27, a band reinforcement 28, and a PC steel wire 26 embedded in the concrete portion 25. The lower end of the PC steel wire 26 is connected to the end plate 42 of the connecting member 40 on the column member 21 side. The upper end of the PC steel wire 26 is connected to a connecting member 50 provided on the top of the column member 21.

柱部材１１は、内部空間１１ａを有して円筒状のコンクリート部１２と、コンクリート部１２内に埋設されている主筋１４、帯筋１５、ＰＣ鋼線１３と、を備える。ＰＣ鋼線１３の上端は柱部材１１側の連結部材４０の端板４２に連結されている。なお、ＰＣ鋼線１３の下端は柱部材２１の下部の端板１６に連結されている。   The column member 11 includes an internal space 11 a and a cylindrical concrete portion 12, and a main reinforcing bar 14, a band 15, and a PC steel wire 13 embedded in the concrete portion 12. The upper end of the PC steel wire 13 is connected to the end plate 42 of the connecting member 40 on the column member 11 side. The lower end of the PC steel wire 13 is connected to the end plate 16 at the lower part of the column member 21.

各連結部材４０の環状部４１、４１は、それぞれ、柱部材２１の下端部、柱部材１１の上端部を囲んで、各コンクリート部２５、１２を拘束している。これにより、柱部材２１と柱部材１１との連結部位においてコンクリート部２５、１２の強度が高まり、連結強度を高めることができる。   The annular portions 41, 41 of each connecting member 40 surround the lower end portion of the column member 21 and the upper end portion of the column member 11, respectively, and restrain the concrete portions 25, 12. Thereby, the intensity | strength of the concrete parts 25 and 12 increases in the connection part of the column member 21 and the column member 11, and it can raise connection strength.

柱部材２１の主筋２７、帯筋２８及びＰＣ鋼線２６は、相対的に小径の上部２３の外径を基準として配筋されている。このため、柱部材２１の下部２２においては、かぶり厚が厚くなっている。よって、環状部４１の厚みを厚くして更なる強度向上を図る場合に、環状部４１と主筋２７、帯筋２８及びＰＣ鋼線２６が干渉することを回避し易くなっている。なお、環状部４１と端板４２を厚くすることにより、補強リブ４３による補強をせずに強度と剛性を向上させることもできる。   The main reinforcement 27, the band reinforcement 28, and the PC steel wire 26 of the column member 21 are arranged on the basis of the outer diameter of the relatively small diameter upper portion 23. For this reason, in the lower part 22 of the column member 21, the cover thickness is thick. Therefore, when the thickness of the annular portion 41 is increased to further improve the strength, it is easy to avoid the interference between the annular portion 41, the main reinforcement 27, the band reinforcement 28, and the PC steel wire 26. Note that by increasing the thickness of the annular portion 41 and the end plate 42, the strength and rigidity can be improved without reinforcement by the reinforcing rib 43.

連結部材４０、４０を介した、互いに隣接した柱部材２１、１１間の連結は、互いの端板４２のボルト穴４４に不図示のボルトを挿入して不図示のナットで締結することで行う。端板４２、４２間に鉄板を挟むことで、建て入れ調整を行うことができる。   The connection between the column members 21 and 11 adjacent to each other via the connection members 40 and 40 is performed by inserting a bolt (not shown) into the bolt hole 44 of each end plate 42 and fastening with a nut (not shown). . The erection adjustment can be performed by sandwiching the iron plate between the end plates 42 and 42.

連結部材５０の構成は、後述する図３（Ａ）に示すように連結部材４０と同様であり、ただ径が異なるだけである。柱部材２１と柱部材３１の連結構造は柱部材２１と柱部材１１との連結構造と同様であり、柱部材２１の上端部、柱部材３１の下端部にそれぞれ連結部材５０、５０を設けて連結する。柱部材３１内の内部構造も柱部材２１と同様である。   The structure of the connecting member 50 is the same as that of the connecting member 40 as shown in FIG. 3A described later, only the diameter is different. The connection structure between the column member 21 and the column member 31 is the same as the connection structure between the column member 21 and the column member 11. The connection members 50 and 50 are provided at the upper end portion of the column member 21 and the lower end portion of the column member 31, respectively. Link. The internal structure in the column member 31 is the same as that of the column member 21.

以上の構成からなる塔状構造物Ａでは、その柱体１が下側から上側へ向かって全体的には縮径しているので、地震や風力による振れを低減できる。また、柱部材２１、３１はその下部２２、３２が相対的に大径であることから、連結部分の剛性を確保することができる。   In the tower-like structure A having the above-described configuration, the columnar body 1 is reduced in diameter from the lower side toward the upper side, so that shake due to an earthquake or wind force can be reduced. Further, since the lower portions 22 and 32 of the column members 21 and 31 have a relatively large diameter, the rigidity of the connecting portion can be ensured.

柱部材間の連結はフランジ部を有する連結部材４０、５０を介して行ったことから、建て入れ調整が可能であり、また、上部より相対的に太径の環状部４１の存在により連結部分の剛性を更に向上できる。径変化部２４（縮径部位１ａ）は環状部４１よりも上方に位置していることから、柱部材２１の太い部分（下部２２）が環状部４１で補強され、相乗的に剛性を向上できる。柱体１は全体として円筒体であり、中実の場合よりも軽量化が図れることから、特に、上部の重量を負担する下部において、必要な剛性を低下させることができる。   Since the connection between the column members is performed through the connection members 40 and 50 having the flange portion, it is possible to adjust the erection, and due to the presence of the annular portion 41 having a relatively larger diameter than the upper portion, The rigidity can be further improved. Since the diameter changing portion 24 (the reduced diameter portion 1a) is located above the annular portion 41, the thick portion (lower portion 22) of the column member 21 is reinforced by the annular portion 41, and the rigidity can be improved synergistically. . Since the column 1 is a cylindrical body as a whole and can be reduced in weight as compared with a solid case, the required rigidity can be reduced particularly in the lower portion bearing the weight of the upper portion.

次に、柱部材２１に連結部材４０、５０を一体的に設ける例について説明する。図３（Ａ）は本発明の一実施形態に係る型枠構造の断面図を示しており、この型枠構造は柱部材２１に連結部材４０、５０を一体的に設けて柱構成部材２０を製造するためのものである。   Next, an example in which the connecting members 40 and 50 are integrally provided on the column member 21 will be described. FIG. 3A shows a cross-sectional view of a formwork structure according to an embodiment of the present invention. In this formwork structure, connecting members 40 and 50 are integrally provided on a column member 21 to form the column component member 20. It is for manufacturing.

この型枠構造は、型枠６０と、型枠６０に対して固定端側に位置する型枠７０と、緊張端側に位置する型枠８０と、を主要な構成としている。型枠６０は、半割りの部材を組み付けることで構成される、全体として円筒状の部材であって、柱部材２１を構成する鉄筋籠（主筋２７、帯筋２８）を、その長手方向両端部を除いて囲む。図３（Ａ)はコンクリート部２５を構成するコンクリートの投入前の状態を示し、破線Ｌ１はコンクリート部２５の内周の位置を示しており、型枠６０の内周面は、コンクリート部２５の外周面を形成することになる。   This formwork structure mainly includes a formwork 60, a formwork 70 located on the fixed end side with respect to the formwork 60, and a formwork 80 located on the tension end side. The formwork 60 is a generally cylindrical member configured by assembling half members, and the reinforcing bar rods (main bars 27, band bars 28) constituting the column member 21 are arranged at both longitudinal ends thereof. Enclose except. 3A shows a state before the concrete constituting the concrete portion 25 is put in, the broken line L1 shows the position of the inner periphery of the concrete portion 25, and the inner peripheral surface of the formwork 60 is the same as that of the concrete portion 25. FIG. An outer peripheral surface is formed.

型枠６０は、柱部材２１の下部２２に対応した大径部６１と、上部２３に対応した小径部６２と、径変化部２４に対応した径変化部６３と、を有している。大径部６１と小径部６２の各端部には、それぞれフランジ部６１ａ、６２ａが形成されている。また、型枠６０の外周面には、その長手方向の複数個所に設けられ、遠心力成形時にローラＲが当接して型枠６０を回転させるための円環状のタイヤ部６４が設けられている。   The mold 60 includes a large diameter portion 61 corresponding to the lower portion 22 of the column member 21, a small diameter portion 62 corresponding to the upper portion 23, and a diameter changing portion 63 corresponding to the diameter changing portion 24. Flange portions 61 a and 62 a are formed at the end portions of the large diameter portion 61 and the small diameter portion 62, respectively. Further, an annular tire portion 64 is provided on the outer peripheral surface of the mold 60 at a plurality of positions in the longitudinal direction thereof, and the roller R abuts and rotates the mold 60 at the time of centrifugal force molding. .

図３（Ａ）に加えて図３（Ｂ)を参照して型枠７０について説明する。図３（Ｂ)は型枠７０の斜視図である。型枠７０は半割りの部材７０ａ、７０ｂを組み付けることで構成される、全体として円筒状の部材であり、連結部材４０のフランジ部４２’、補強リブ４３及び環状部４１の一部を囲んでいる。   The formwork 70 will be described with reference to FIG. 3B in addition to FIG. FIG. 3B is a perspective view of the mold 70. The mold 70 is a generally cylindrical member configured by assembling the half members 70 a and 70 b, and surrounds a part of the flange portion 42 ′, the reinforcing rib 43, and the annular portion 41 of the connecting member 40. Yes.

型枠７０は、円筒部７１と円筒部７１の両端部に設けられたフランジ部７２、７３とを備える。フランジ部７２は円筒部７１の半径方向外方にのみ突出し、フランジ部７３は円筒部７１の半径方向外方及び内方の双方に突出している。   The mold 70 includes a cylindrical portion 71 and flange portions 72 and 73 provided at both ends of the cylindrical portion 71. The flange portion 72 protrudes only outward in the radial direction of the cylindrical portion 71, and the flange portion 73 protrudes both radially outward and inward of the cylindrical portion 71.

フランジ部７３の内方突出部分には、ボルト穴７３ａが設けられている。型枠６０のフランジ部６１ａには不図示のボルト穴が設けられており、フランジ部７３の内方突出部分とフランジ部６１ａを当接して、このボルト穴とボルト穴７３ａにボルトを挿入してナットで締結することで両者を固定することができる。   A bolt hole 73 a is provided in the inwardly protruding portion of the flange portion 73. The flange portion 61a of the mold 60 is provided with a bolt hole (not shown). The inwardly protruding portion of the flange portion 73 and the flange portion 61a are brought into contact with each other, and a bolt is inserted into the bolt hole and the bolt hole 73a. Both can be fixed by fastening with a nut.

このように本実施形態では、型枠６０に対して型枠７０を分離可能としているが、溶接等により固着してもよい。但し、分離可能とすることで型枠７０を交換することで、異なる連結部材４０にも対応可能となる。   As described above, in the present embodiment, the mold 70 can be separated from the mold 60, but may be fixed by welding or the like. However, it becomes possible to deal with different connecting members 40 by exchanging the mold 70 by making it separable.

フランジ部７３の内方突出部分の内径と、型枠６０の大径部６１の内径とは同径となっており、フランジ部７３の内方突出部分の内周面は連結部材４０の環状部４１の外周面に当接している。   The inner diameter of the inward projecting portion of the flange portion 73 and the inner diameter of the large diameter portion 61 of the mold 60 are the same diameter, and the inner peripheral surface of the inward projecting portion of the flange portion 73 is the annular portion of the connecting member 40. 41 is in contact with the outer peripheral surface of 41.

型枠７０の外周部と内周部とには、それぞれ、補強リブ７１ａ、７４が複数設けられている。補強リブ７１ａはフランジ部７２、７３及び円筒部７１の外周面に接続されており、円筒部７１の周方向に離間して複数設けられている。補強リブ７４はフランジ部７３及び円筒部７１の内周面に接続されており、円筒部７１の周方向に離間して複数設けられている。補強リブ７４は、連結部材４０の補強リブ４３と干渉しない位置に設けられている。これらの補強リブ７１ａ、７４を設けたことで型枠７０の剛性を向上できるが、これらを設けない構成も採用可能である。   A plurality of reinforcing ribs 71a and 74 are provided on the outer peripheral portion and the inner peripheral portion of the mold 70, respectively. The reinforcing ribs 71 a are connected to the outer peripheral surfaces of the flange portions 72 and 73 and the cylindrical portion 71, and a plurality of reinforcing ribs 71 a are provided apart from each other in the circumferential direction of the cylindrical portion 71. The reinforcing ribs 74 are connected to the inner peripheral surfaces of the flange portion 73 and the cylindrical portion 71, and a plurality of reinforcing ribs 74 are provided apart from each other in the circumferential direction of the cylindrical portion 71. The reinforcing rib 74 is provided at a position that does not interfere with the reinforcing rib 43 of the connecting member 40. Although the rigidity of the formwork 70 can be improved by providing these reinforcing ribs 71a and 74, a configuration without these can also be adopted.

連結部材４０のフランジ部４２’（端板４２）の外側には、プレストレス力を負担する固定端側のエンドプレート１００が設けられている。エンドプレート１００は円板上をなした金属製（例えば鋼製）の部材であって、不図示のボルト及びナットにより端板４２に締結されて固定されており、プレストレス力の作用時に端板４２を補強する。   On the outer side of the flange portion 42 ′ (end plate 42) of the connecting member 40, a fixed end side end plate 100 that bears a prestressing force is provided. The end plate 100 is a metal (for example, steel) member formed on a circular plate, and is fastened and fixed to the end plate 42 by bolts and nuts (not shown). 42 is reinforced.

型枠７０のフランジ部７２はエンドプレート１００の周縁部に当接する一方、上記のとおり、フランジ部７３の内方突出部分は型枠６０のフランジ部６１ａに当接する。このため、型枠７０は型枠６０とエンドプレート１００との間に介在してエンドプレート１００や型枠６０と共にプレストレス力を負担する。   The flange portion 72 of the mold frame 70 contacts the peripheral edge portion of the end plate 100, while the inwardly protruding portion of the flange portion 73 contacts the flange portion 61a of the mold frame 60 as described above. Therefore, the mold 70 is interposed between the mold 60 and the end plate 100 and bears a prestressing force together with the end plate 100 and the mold 60.

次に、図３（Ａ)を参照して型枠８０について説明する。型枠８０は、型枠７０と同様の構成であり、半割りの部材を組み付けることで構成される、全体として円筒状の部材であり、連結部材５０の一部及びエンドプレート１０１を囲んでいる。   Next, the formwork 80 will be described with reference to FIG. The mold 80 has the same configuration as that of the mold 70, and is a generally cylindrical member configured by assembling half members, and surrounds a part of the connecting member 50 and the end plate 101. .

連結部材５０は、上記連結部材４０と同様の構成の、金属製（例えば鋼製）の部材であって、円筒状の環状部５１と、環状部５１の端面に接続された端板５２と、を備え、端板５２の一部は、環状部５１の径方向外方に突出したフランジ部５２’を構成している。フランジ部５２’にはボルト穴４４が複数設けられている。フランジ部５２’にボルト穴（不図示）が設けられる点、及び、補強リブ５３が設けられる点も連結部材４０と同様であり、補強リブ５３は環状部５１の周囲に複数設けられ、環状部５１とフランジ部５２’とに接続されている。型枠８０は連結部材５０のフランジ部５２’、補強リブ５３及び環状部５１の一部を囲んでいる。   The connecting member 50 is a metal (for example, steel) member having the same configuration as the connecting member 40, and includes a cylindrical annular portion 51, an end plate 52 connected to the end surface of the annular portion 51, and A part of the end plate 52 constitutes a flange portion 52 ′ protruding outward in the radial direction of the annular portion 51. A plurality of bolt holes 44 are provided in the flange portion 52 '. The point that a bolt hole (not shown) is provided in the flange portion 52 ′ and the point that the reinforcing rib 53 is provided are the same as those of the connecting member 40, and a plurality of reinforcing ribs 53 are provided around the annular portion 51. 51 and the flange portion 52 ′. The mold 80 surrounds a part of the flange portion 52 ′, the reinforcing rib 53, and the annular portion 51 of the connecting member 50.

連結部材５０のフランジ部５２’（端板５２）の外側には、プレテンション力が作用する緊張端側のエンドプレート１０１が設けられている。エンドプレート１０１は円板上をなした金属製（例えば鋼製）の部材であって、不図示のボルト及びナットにより端板５２に締結されて固定されており、プレテンション力の作用時に端板５２を補強する。   On the outer side of the flange portion 52 ′ (end plate 52) of the connecting member 50, a tension end side end plate 101 on which a pretension force acts is provided. The end plate 101 is a metal (for example, steel) member formed on a circular plate, and is fastened and fixed to the end plate 52 by bolts and nuts (not shown). When the pretension force is applied, the end plate 101 is fixed. 52 is reinforced.

型枠８０は、円筒部８１と円筒部８１の両端部に設けられたフランジ部８２、８３とを備え、型枠７０と同様の構成であるが、円筒部８１の全長が円筒部７１よりも長めとなっている。フランジ部８２は円筒部７１の半径方向外方にのみ突出し、フランジ部８３は円筒部８１の半径方向外方及び内方の双方に突出している。   The mold 80 includes a cylindrical portion 81 and flange portions 82 and 83 provided at both ends of the cylindrical portion 81, and has the same configuration as the mold 70, but the overall length of the cylindrical portion 81 is larger than that of the cylindrical portion 71. It is long. The flange portion 82 protrudes only outward in the radial direction of the cylindrical portion 71, and the flange portion 83 protrudes both radially outward and inward of the cylindrical portion 81.

フランジ部８３の内方突出部分には、ボルト穴（不図示。ボルト穴７３ａと同様。）が設けられている。型枠７０のフランジ部６２ａには不図示のボルト穴が設けられており、フランジ部８３の内方突出部分とフランジ部６２ａを当接して、これらのボルト穴にボルトを挿入してナットで締結することで両者を固定することができる。   A bolt hole (not shown; similar to the bolt hole 73a) is provided in the inwardly protruding portion of the flange portion 83. The flange portion 62a of the mold 70 is provided with a bolt hole (not shown). The inwardly protruding portion of the flange portion 83 and the flange portion 62a are brought into contact with each other, and bolts are inserted into these bolt holes and fastened with nuts. By doing so, both can be fixed.

このように本実施形態では、型枠６０に対して型枠８０も分離可能としているが、溶接等により固着してもよい。但し、分離可能とすることで型枠８０を交換することで、異なる連結部材５０にも対応可能となる。   As described above, in the present embodiment, the mold 80 is separable from the mold 60, but may be fixed by welding or the like. However, it becomes possible to deal with different connecting members 50 by exchanging the formwork 80 by making it separable.

フランジ部８３の内方突出部分の内径と、型枠６０の小径部６２の内径とは同径となっており、フランジ部８３の内方突出部分の内周面は連結部材５０の環状部５１の外周面に当接している。また、円筒部８１の内径と、連結部材５０のフランジ部５２’の外径及びエンドプレート１０１の外径とは同径となっており、フランジ部５２’の外周面及びエンドプレート１０１の外周面は円筒部８１の内周面に当接している。このため、エンドプレート１０１に対して矢印ｄ１方向にプレテンション力が作用した場合に、エンドプレート１０１及び連結部材５０は、矢印ｄ１方向に変位可能となっている。エンドプレート１０１及び連結部材５０はＰＣ鋼線２６の伸び量だけ変位し、円筒部８１の全長はこの変位が許容されるように、余裕を持って設定される。   The inner diameter of the inward projecting portion of the flange portion 83 is the same as the inner diameter of the small diameter portion 62 of the mold frame 60, and the inner peripheral surface of the inward projecting portion of the flange portion 83 is the annular portion 51 of the connecting member 50. It is in contact with the outer peripheral surface of. Further, the inner diameter of the cylindrical portion 81 is the same as the outer diameter of the flange portion 52 ′ of the connecting member 50 and the outer diameter of the end plate 101. The outer peripheral surface of the flange portion 52 ′ and the outer peripheral surface of the end plate 101 are the same. Is in contact with the inner peripheral surface of the cylindrical portion 81. Therefore, when a pretension force is applied to the end plate 101 in the direction of the arrow d1, the end plate 101 and the connecting member 50 can be displaced in the direction of the arrow d1. The end plate 101 and the connecting member 50 are displaced by the elongation amount of the PC steel wire 26, and the entire length of the cylindrical portion 81 is set with a margin so that this displacement is allowed.

型枠８０の内周部には、補強リブ８４が複数設けられている。補強リブ８４はフランジ部８３及び円筒部８１の内周面に接続されており、円筒部８１の周方向に離間して複数設けられている。補強リブ８４は、連結部材５０の補強リブ５３と干渉しない位置に設けられている。また、型枠７０の補強リブ７１ａと同様の補強リブ（不図示）が型枠８０にも設けられる。これらの補強リブを設けたことで型枠８０の剛性を向上できるが、これらを設けない構成も採用可能である。   A plurality of reinforcing ribs 84 are provided on the inner periphery of the formwork 80. The reinforcing ribs 84 are connected to the inner peripheral surfaces of the flange portion 83 and the cylindrical portion 81, and a plurality of reinforcing ribs 84 are provided apart from each other in the circumferential direction of the cylindrical portion 81. The reinforcing rib 84 is provided at a position where it does not interfere with the reinforcing rib 53 of the connecting member 50. Further, reinforcing ribs (not shown) similar to the reinforcing ribs 71 a of the mold 70 are also provided on the mold 80. By providing these reinforcing ribs, the rigidity of the mold 80 can be improved, but a configuration without these can also be employed.

型枠８０のフランジ部８３は、上記のとおり、その内方突出部分が型枠６０のフランジ部６２ａに当接する一方、フランジ部８２は支持部材９０の一方端部のフランジ部９１に当接し、型枠８０は型枠６０と支持部材９０との間に介在する。本実施形態の場合、支持部材９０は在来の型枠を利用したものであって、半割の部材を組み付けることで構成される、全体として円筒状の部材であり、緊張端側においてプレテンション力を負担する。支持部材９０は、連結部材５０のフランジ部５２’（端板５２）の外側に配置されており、その他方端部は固定される。型枠８０の外周面にもタイヤ部９２が設けられている。   As described above, the flange portion 83 of the mold 80 is in contact with the flange portion 62a of the mold member 60, while the flange portion 82 is in contact with the flange portion 91 at one end of the support member 90. The mold 80 is interposed between the mold 60 and the support member 90. In the case of the present embodiment, the support member 90 uses a conventional formwork, and is a generally cylindrical member configured by assembling halved members, and is pretensioned on the tension end side. Bear power. The support member 90 is disposed outside the flange portion 52 ′ (end plate 52) of the connecting member 50, and the other end portion is fixed. A tire portion 92 is also provided on the outer peripheral surface of the formwork 80.

支持部材９０の内部には、棒状の引張部材１０２が挿通しており、引張部材１０２の端部はエンドプレート１０１に連結されている。引張部材１０２は不図示の引張装置に連結されて矢印ｄ１方向に引っ張られ、これによりエンドプレート１０１及び連結部材５０が矢印方向に引っ張られる。その際、支持部材９０、型枠６０、７０、８０、エンドプレート１００及び連結部材４０は不動である一方、エンドプレート１０１及び連結部材５０は型枠８０内でｄ１方向に変位してＰＣ鋼線２６が緊張する。こうしてプレテンション力が付与される。 A rod-shaped tension member 102 is inserted into the support member 90, and an end portion of the tension member 102 is connected to the end plate 101. The pulling member 102 is connected to a pulling device (not shown) and pulled in the direction of the arrow d1, thereby pulling the end plate 101 and the connecting member 50 in the direction of the arrow. At that time, the support member 90, the molds 60, 70, and 80, the end plate 100, and the connecting member 40 are immovable, while the end plate 101 and the connecting member 50 are displaced in the d1 direction within the mold 80 to be PC steel wire. 26 is nervous. Thus, a pretension force is applied.

その後、引張部材１０２を適宜方法にて支持部材９０に固定し、ＰＣ鋼線２６の緊張状態を維持した状態として引張装置から分離し、コンクリートの投入、ローラＲ上での遠心力成形を行い、柱構成部材２０を製造することができる。   Thereafter, the tension member 102 is fixed to the support member 90 by an appropriate method, separated from the tension device in a state where the tension state of the PC steel wire 26 is maintained, the concrete is charged, and centrifugal force molding on the roller R is performed. The pillar component member 20 can be manufactured.

本実施形態では、このようにして柱部材２１と連結部材４０、５０とを一体的に製造することができる。特に、緊張端側において型枠８０を設け、その内部をエンドプレート１０１及び連結部材５０が変位可能としたことから、緊張端側に連結部材（５０）を柱部材（２１）に一体的に設けることが可能となった。このため、柱部材（２１）の両端部に連結部材（４０、５０）を有する柱構成部材（２０）を製造することが容易化する。   In the present embodiment, the column member 21 and the connecting members 40 and 50 can be integrally manufactured in this manner. In particular, the formwork 80 is provided on the tension end side, and the end plate 101 and the connection member 50 are displaceable inside, so the connection member (50) is integrally provided on the column member (21) on the tension end side. It became possible. For this reason, it becomes easy to manufacture the column component member (20) having the connecting members (40, 50) at both ends of the column member (21).

また、型枠７０、８０が連結部材４０、５０の補強リブ４３、５３を囲むように構成したことから、連結部材（４０、５０）に補強リブ（４３、５３）を設けた構成においても、これらと型枠が干渉することを回避して、プレテンション力を負担させることができる。   In addition, since the molds 70 and 80 are configured to surround the reinforcing ribs 43 and 53 of the connecting members 40 and 50, the connecting members (40 and 50) are provided with the reinforcing ribs (43 and 53). By avoiding interference between these and the formwork, the pretension force can be borne.

なお、本実施形態では、柱部材２１がその途中で外径が変化した構成の場合を例に挙げたが、軸方向全体に渡って同径の柱部材と連結部材とを一体的に製造する場合等、型枠形状の変更により、各種形状の柱部材と連結部材とを一体的に製造する場合にも、上記の型枠構造が適用可能である。   In addition, in this embodiment, although the case where the pillar member 21 was the structure where the outer diameter changed in the middle was mentioned as an example, the pillar member and connection member of the same diameter are integrally manufactured over the whole axial direction. The above-mentioned formwork structure can also be applied to the case where columnar members and connecting members having various shapes are integrally manufactured by changing the formwork shape.

また、型枠８０の端部の外径ないし構成は、支持部材９０に応じて適宜変更可能である。図４は別実施形態の型枠構造を示しており、図３（Ａ)の例とは型枠８０、支持部材９０の構成が若干異なっている。   In addition, the outer diameter or configuration of the end portion of the mold 80 can be appropriately changed according to the support member 90. FIG. 4 shows a mold structure of another embodiment, and the configurations of the mold 80 and the support member 90 are slightly different from the example of FIG.

図４の実施形態では、型枠８０に代えて型枠８０’が、支持部材９０に代えて支持部材９０’がそれぞれ採用されている。支持部材９０’は、型枠６０の小径部６２と同径の在来型枠を利用した構成となっている。型枠８０’は、型枠８０のフランジ部８２を、フランジ部８３と同様の構成のフランジ部８２’としており、また、補強リブ８４’をフランジ部８２’と円筒部８１とに接続している。円筒部８１は図３（Ａ)の実施形態の円筒部８１よりも若干長くなっている。   In the embodiment of FIG. 4, a mold 80 ′ is used instead of the mold 80, and a support member 90 ′ is used instead of the support member 90. The support member 90 ′ is configured to use a conventional mold having the same diameter as the small diameter portion 62 of the mold 60. In the mold 80 ′, the flange portion 82 of the mold 80 is a flange portion 82 ′ having the same configuration as the flange portion 83, and the reinforcing rib 84 ′ is connected to the flange portion 82 ′ and the cylindrical portion 81. Yes. The cylindrical portion 81 is slightly longer than the cylindrical portion 81 in the embodiment of FIG.

図４の実施形態の利点は、型枠８０’の両側の型枠６０、支持部材９０’について同径の型枠を利用可能とする点にある。例えば、柱部材２１が軸方向全体に渡って同径の柱部材である場合、型枠６０及び支持部材９０’に相当する部分を在来の型枠をそのまま利用することができる。   The advantage of the embodiment of FIG. 4 is that molds of the same diameter can be used for the molds 60 and support members 90 'on both sides of the mold 80'. For example, when the column member 21 is a column member having the same diameter in the entire axial direction, the conventional mold can be used as it is for the portions corresponding to the mold 60 and the support member 90 '.

Ａ 塔状構造物
１ 柱体
１０、２０、３０ 柱構成部材
１１、２１、３１ 柱部材
６０、７０、８０ 型枠
１００、１０１ エンドプレート A Tower-like structure 1 Column body 10, 20, 30 Column component member 11, 21, 31 Column member 60, 70, 80 Formwork 100, 101 End plate

Claims (4)

アンテナを支持する柱状の塔状構造物を構成する柱構成部材を製造するための型枠構造であって、
前記柱構成部材が、
ＰＨＣ又はＰＲＣ製の柱部材と、
前記柱部材の一方の端部に設けられ、隣接する別の前記柱構成部材を連結するための連結部材と、を備え、
前記連結部材が、
前記柱部材の端部を囲む環状部と、
前記環状部に接続され、他の前記柱構成部材と連結されるフランジ部と、を備え、
前記型枠構造は、
前記柱部材を構成する鉄筋籠を囲む第１型枠と、
前記第１型枠と、前記フランジ部の外側に配置され、プレテンション力を負担する緊張端側の支持部材と、の間に介在し、前記連結部材がプレテンション力の作用方向に変位可能に、前記フランジ部及び緊張端側のエンドプレートを囲む第２型枠と、を備え、
前記第２型枠は前記第１型枠に分離可能に固定されることを特徴とする型枠構造。 It is a formwork structure for manufacturing a column constituting member that constitutes a columnar tower structure that supports an antenna,
The pillar component member is
A pillar member made of PHC or PRC;
A connecting member provided at one end of the pillar member for connecting another adjacent pillar component member; and
The connecting member is
An annular portion surrounding the end of the column member;
A flange portion connected to the annular portion and coupled to the other pillar component member,
The formwork structure is
A first mold frame that surrounds the reinforcing rods constituting the column member;
It is arranged between the first formwork and the supporting member on the tension end side that bears the pretension force and is arranged outside the flange portion, so that the connecting member can be displaced in the acting direction of the pretension force. A second mold frame surrounding the flange portion and the end plate on the tension end side ,
The formwork structure, wherein the second formwork is separably fixed to the first formwork. アンテナを支持する柱状の塔状構造物を構成する柱構成部材を製造するための型枠構造であって、
前記柱構成部材が、
ＰＨＣ又はＰＲＣ製の柱部材と、
前記柱部材の一方の端部に設けられ、隣接する別の前記柱構成部材を連結するための連結部材と、を備え、
前記連結部材が、
前記柱部材の端部を囲む環状部と、
前記環状部に接続され、他の前記柱構成部材と連結されるフランジ部と、
前記環状部の周囲に複数設けられ、前記環状部と前記フランジ部とに接続された補強リブ部と、を備え、
前記型枠構造は、
前記柱部材を構成する鉄筋籠を囲む第１型枠と、
前記第１型枠と、前記フランジ部の外側に配置され、プレテンション力を負担する固定端側のエンドプレートと、の間に介在し、前記フランジ部及び前記補強リブ部を囲む第２型枠と、
を備えたことを特徴とする型枠構造。 It is a formwork structure for manufacturing a column constituting member that constitutes a columnar tower structure that supports an antenna,
The pillar component member is
A pillar member made of PHC or PRC;
A connecting member provided at one end of the pillar member for connecting another adjacent pillar component member; and
The connecting member is
An annular portion surrounding the end of the column member;
A flange portion connected to the annular portion and connected to the other pillar components;
A plurality of reinforcing ribs provided around the annular part and connected to the annular part and the flange part,
The formwork structure is
A first mold frame that surrounds the reinforcing rods constituting the column member;
A second mold that is interposed between the first mold and the end plate on the fixed end side that is disposed outside the flange and bears a pretension force, and surrounds the flange and the reinforcing rib. When,
Formwork structure characterized by comprising 前記連結部材が、前記環状部の周囲に複数設けられ、前記環状部と前記フランジ部とに接続された補強リブ部を備え、
前記第２型枠は前記補強リブ部を囲むことを特徴とする請求項１に記載の型枠構造。 A plurality of the connecting members are provided around the annular portion, and include a reinforcing rib portion connected to the annular portion and the flange portion,
The formwork structure according to claim 1, wherein the second formwork surrounds the reinforcing rib portion. 前記第２型枠の内周部において、前記補強リブ部と干渉しない位置に型枠用補強リブ部を設けたことを特徴とする請求項２又は３に記載の型枠構造。   The formwork structure according to claim 2 or 3, wherein a formwork reinforcement rib portion is provided at a position not interfering with the reinforcement rib portion in an inner peripheral portion of the second formwork.
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