JP2005240504A - Manufacturing method for knotted concrete pile (high frictional force concrete pile) - Google Patents

Manufacturing method for knotted concrete pile (high frictional force concrete pile) Download PDF

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JP2005240504A
JP2005240504A JP2004054795A JP2004054795A JP2005240504A JP 2005240504 A JP2005240504 A JP 2005240504A JP 2004054795 A JP2004054795 A JP 2004054795A JP 2004054795 A JP2004054795 A JP 2004054795A JP 2005240504 A JP2005240504 A JP 2005240504A
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end plate
concrete
diameter
pile
enlarged
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JP4260044B2 (en
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Yusuke Honma
裕介 本間
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Geotop Corp
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<P>PROBLEM TO BE SOLVED: To efficiently and inexpensively manufacture a knotted concrete pile (high frictional force concrete pile) having a large-diameter end plate integrated thereon and capable of being joined with another end plate by using a bolt or the like. <P>SOLUTION: The high frictional force concrete pile having an extended-diameter end plate 2a having a diameter larger than that of a shaft part is manufactured by using an openable/closable circular cylindrical form 21 provided with a plurality of knot-forming sections 23 with a specified interval between them in the axial direction of the form. The extended-diameter end plate 2a on the one end is secured on one end of a bottom form of the circular cylindrical form 23, the end plate 2a on the other end is set in one of the knot-forming sections 23 and an end section of a main reinforcing bar 11a constituting a cage is fixed between the two end plates 2a. Then, concrete is filled, a top form of the circular cylindrical form 23 is put on, the end plate 2a set in the knot-forming section 23 is tensioned through a tension plate 12 and a tension rod 13, and the pile is centrifugally cast with introducing a tension in the main reinforcement bar 11a. After being cured, the pile is removed from the form. Thus, a prestress is introduced in the high frictional force concrete pile having the extended-diameter end plate 2a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本願発明は、基礎杭等として利用されるコンクリート節杭、特に軸部外径より外径の大きい端板を備えたコンクリート節杭の製造方法に関するものである。   TECHNICAL FIELD The present invention relates to a method for manufacturing a concrete joint pile used as a foundation pile or the like, particularly a concrete joint pile provided with an end plate having an outer diameter larger than an outer diameter of a shaft portion.

既製杭としてのプレストレスト高強度コンクリート杭（ＰＨＣ杭）の製造においては、生産効率等の利点から遠心成形方法と蒸気養生等と組み合わせた製造方法が広く利用されている。   In manufacturing prestressed high-strength concrete piles (PHC piles) as ready-made piles, a manufacturing method in combination with a centrifugal forming method and steam curing is widely used because of advantages such as production efficiency.

その場合、型枠にセットした端板（端部金具）に鉄筋籠の主筋を定着させてコンクリート充填し、一方の端板を固定した状態で他方の端板に取り付けた緊張板を介して主筋に緊張力を与え、その状態で円筒型枠を軸回りに回転させることで遠心成形するのが一般的である。この端板は、従来、鉄筋の定着の目的の他、製造されたＰＣ杭どうしを溶接等で継ぎ足す場合等にも利用されている。   In that case, the main bar of the reinforcing bar rod is fixed to the end plate (end fitting) set in the mold and filled with concrete, and the main bar is connected via the tension plate attached to the other end plate with one end plate fixed. In general, it is centrifugally formed by applying a tension force and rotating a cylindrical frame around the axis in this state. Conventionally, this end plate is used not only for the purpose of fixing reinforcing bars, but also when connecting manufactured PC piles by welding or the like.

ところで、ＰＣ杭としては、軸部と該軸部より径が大きい節部とを有する摩擦支持力の大きいコンクリート節杭が利用されることも多いが、従来からの一般的な節杭は、両端部に節部が設けられていない形状であるため、杭先端部での大きな先端支持力が得難い、節杭どうしまたは節杭と他の既製杭どうしを上下に継ぎ足す場合、上述のように端板どうしを溶接して連結するが、連結部分の外径が節部径よりも小さく連結部分の曲げ耐力が小さい、といった問題があった。   By the way, as a PC pile, a concrete joint pile having a large frictional support force having a shaft portion and a node portion having a diameter larger than that of the shaft portion is often used. As the shape is such that no joint is provided in the part, it is difficult to obtain a large tip support force at the tip of the pile. Although the plates are connected by welding, there is a problem that the outer diameter of the connecting portion is smaller than the diameter of the node and the bending strength of the connecting portion is small.

これらの問題に対し、本願の出願人による特許文献１には、両端部を拡径し、連結部分が節部となる杭構成体が記載されている。   With respect to these problems, Patent Document 1 by the applicant of the present application describes a pile structure in which both end portions are enlarged in diameter and a connection portion is a node portion.

また、既製杭どうしの連結構造に関しては、特許文献２に、杭端部に筒部材を係合させ、端板としての筒部材の端部に溶接した杭本体部の径より大きい径の円形プレートどうしをボルト接合することで、上下のコンクリート杭どうしを無溶接で連結する構造が記載されている。   Moreover, regarding the connection structure of ready-made piles, Patent Document 2 discloses a circular plate having a diameter larger than the diameter of a pile main body portion in which a cylindrical member is engaged with a pile end portion and welded to an end portion of the cylindrical member as an end plate. A structure is described in which the upper and lower concrete piles are joined together without welding by bolting them together.

この他、特許文献３には、既製コンクリート杭の端部に設けられる端板を杭本体部の径より大径とし、その外周部に形成したボルト挿通孔を利用して上下のコンクリート杭どうしを、ボルト接合により無溶接で接合できるようにした構造が記載されている。   In addition, in Patent Document 3, the end plate provided at the end portion of the ready-made concrete pile is made larger than the diameter of the pile main body portion, and the upper and lower concrete piles are separated by using bolt insertion holes formed in the outer peripheral portion. A structure that can be joined without welding by bolt joining is described.

一方、本願の出願人による特許文献４には、端板を節杭製造用型枠の節部成形部分にセットし、端板の傾きや位置ずれのない状態で、端部（両端または少なくとも一方の端部）に節部を有する、先端支持力や連結部の耐力に優れたコンクリート節杭を製造する方法およびそのための製造用型枠が記載されている。
特公昭６２−０６１７３１号公報 特開平０８−０４１８７１号公報 特開２００１−０１１８５１号公報 特許第２５４７０８８号公報 On the other hand, in Patent Document 4 by the applicant of the present application, an end plate is set on a node forming portion of a form for manufacturing a pile, and the end portion (both ends or at least one of them is not tilted or displaced). The method of manufacturing the concrete joint pile which has a node part in the edge part of this, and was excellent in the tip support force and the yield strength of a connection part, and the manufacturing formwork for it are described.
Japanese Examined Patent Publication No. 62-061731 Japanese Patent Laid-Open No. 08-041871 JP 2001-011851 A Japanese Patent No. 2547088

上述した特許文献２や特許文献３記載の発明は、上下の杭を連結する場合において、杭本体部より大径のプレートどうしをボルト接合できるようにすることで、連結のためのコストの低減や接合強度の向上を図ったものである。   In the invention described in Patent Document 2 and Patent Document 3 described above, when upper and lower piles are connected, a plate having a diameter larger than that of the pile main body can be bolted to reduce the cost for connection. This is intended to improve the bonding strength.

また、コンクリート節杭を考えると、端板の径を節杭の節部の外径と一致またはほぼ一致する外径とすれば、杭どうしの連結が安価で容易となるだけでなく、端板に節部の機能を期待することができる。さらに、先端部の端板を拡径することで、先端支持力の増大が期待できる。   Considering concrete joint piles, if the diameter of the end plate is the same as or substantially the same as the outer diameter of the joint of the joint pile, not only the connection between the piles is cheap and easy, but also the end plate. You can expect the function of knots. Furthermore, an increase in tip support force can be expected by increasing the diameter of the end plate at the tip.

しかし、特許文献２記載の発明では、端板に後から大径のプレートを溶接する必要があり、その分の製作手間がかかることや、溶接部の信頼性に問題がある。   However, in the invention described in Patent Document 2, it is necessary to weld a large-diameter plate to the end plate later, and there is a problem in that much time is required for manufacturing and the reliability of the welded portion.

また、特許文献３記載の発明は、端板自体が大径となっているため、部品の節約になるが、製作上、既製コンクリート杭本体と端板との一体化の問題があり、特に遠心成形によって杭を製造する場合には、大径の端板を取り付けるために特殊な型枠が必要となり、製造コストが増すといった問題がある。   In addition, the invention described in Patent Document 3 saves parts because the end plate itself has a large diameter, but there is a problem of integration of the ready-made concrete pile main body and the end plate in production, especially centrifugal. When manufacturing a pile by molding, a special formwork is required to attach a large-diameter end plate, and there is a problem that the manufacturing cost increases.

本願発明は、従来技術における上述のような課題の解決を図ったものであり、端板どうしのボルト接合等が可能な大径の端板が一体化されたコンクリート節杭を効率よく安価に製造することができるコンクリート節杭の製造方法を提供することを目的としている。   The present invention is intended to solve the above-described problems in the prior art, and efficiently and inexpensively manufactures concrete joint piles integrated with large-diameter end plates that can be bolted between end plates. It aims at providing the manufacturing method of the concrete joint pile which can be done.

本願の請求項１に係る発明は、軸部と該軸部より径が大きい節部とを有し、軸方向両端に設けられる端板間をつなぐ鉄筋により軸方向のプレストレスを導入してなり、かつ少なくとも一端は前記端板として軸部に対し該軸部より径の大きい拡径端板を設けてなるコンクリート節杭の製造方法であって、型枠軸方向に所定の間隔をおいて複数の節部成形部分を有する開閉可能な円筒型枠を用い、該円筒型枠の一端側にセットした端板と、前記節部成形部分の一つにセットした前記拡径端板との間に、主筋の端部をこれらの端板に定着させて配筋を行い、然る後、該円筒型枠内にコンクリートを充填するとともに、前記主筋に緊張力を与えて遠心成形することを特徴とするものである。   The invention according to claim 1 of the present application has a shaft portion and a node portion having a larger diameter than the shaft portion, and introduces axial prestress by a reinforcing bar connecting between end plates provided at both ends in the axial direction. And, at least one end is a method for manufacturing a concrete pile having a diameter-increased end plate having a diameter larger than that of the shaft portion as the end plate, and a plurality of them are provided at predetermined intervals in the mold axis direction. A cylindrical frame having an openable and closable portion, and an end plate set on one end side of the cylindrical frame and the enlarged end plate set on one of the joint molded portions. The end portions of the main bars are fixed to these end plates, and then the reinforcing bars are arranged, and then the concrete is filled in the cylindrical frame, and the main bars are tensioned and centrifugally molded. To do.

円筒型枠自体の基本的な構成については、背景技術の項で述べた特許文献４に記載されているような両端部に節部を形成するための遠心成形用の円筒型枠、あるいは両端部が節部ではなく軸部である従来の一般的なコンクリート節杭の製造に用いられる円筒型枠と同様の構成のものを用いることができる。   As for the basic configuration of the cylindrical frame itself, a centrifugal mold for forming a node at both ends as described in Patent Document 4 described in the background art section, or both ends The thing of the structure similar to the cylindrical form frame used for manufacture of the conventional general concrete joint pile which is a shaft part instead of a node part can be used.

端板は、通常、円筒状の側板とともにキャップ状の端部金具を構成し、端板の部分に主筋の端部を定着させるための係合孔等が形成されている。その状態で端板に接続した緊張装置により主筋に緊張力を与え、型枠内に充填されたコンクリートの養生、硬化後、脱型することで、プレテンション方式で杭体にプレストレスが導入される。   The end plate usually constitutes a cap-shaped end fitting together with the cylindrical side plate, and an engagement hole or the like for fixing the end of the main bar is formed in the end plate. Prestress is introduced into the pile body by the pretension method by applying tension to the main bars by the tensioning device connected to the end plate in that state, and curing and curing the concrete filled in the formwork and then removing the mold. The

本願発明は、少なくとも一端については、特許文献４のようにコンクリート節杭の端部に節部を形成するのではなく、軸部に対して軸部より径の大きい拡径端板を設けたコンクリート節杭の製造に用いられる。   In the present invention, at least one end is not concrete formed at the end of the concrete joint pile as in Patent Document 4, but is a concrete provided with an enlarged end plate having a larger diameter than the shaft portion with respect to the shaft portion. Used in the manufacture of joint piles.

拡径端板は、例えば特許文献３記載の発明における端板と同様に、溶接によらないボルト接合用の接合プレート等として利用することができる。さらに、拡径端板の外径をコンクリート節杭の節部の外径とほぼ同一の外径とすれば、節部の代用として支持力増大効果を期待することもできる。   The enlarged diameter end plate can be used as, for example, a joining plate for bolt joining not based on welding, like the end plate in the invention described in Patent Document 3. Furthermore, if the outer diameter of the enlarged end plate is set to be substantially the same as the outer diameter of the node portion of the concrete joint pile, the effect of increasing the supporting force can be expected as a substitute for the node portion.

その他、接合プレートとしてではなく、拡径端板をコンクリート節杭の先端位置に用いれば、特許文献１のようにコンクリート節杭の先端部に節部がある場合と同様に先端支持力の増大が図れる。   In addition, if the expanded end plate is used as the tip position of the concrete joint pile instead of as a joining plate, the tip supporting force increases as in the case of the joint joint pile having a joint portion as in Patent Document 1. I can plan.

また、拡径端板を杭頭位置に用い、杭頭アンカー筋を取り付けるための接合プレートとして利用することもできる。   Moreover, it can also be utilized as a joining plate for attaching a pile head anchor muscle using an enlarged diameter end plate in a pile head position.

本願の請求項２に係る発明は、軸部と該軸部より径が大きい節部とを有し、軸方向両端に設けられる端板間をつなぐ鉄筋により軸方向のプレストレスを導入してなり、かつ少なくとも一端は前記端板として軸部に対し該軸部より径が大きい拡径端板を設けてなるコンクリート節杭を複数本同時に製造するコンクリート節杭の製造方法であって、型枠軸方向に所定の間隔をおいて複数の節部成形部分を有する開閉可能な円筒型枠を用い、該円筒型枠の一端側にセットした端板と、前記節部成形部分の一つにセットした前記拡径端板との間に、主筋の端部をこれらの端板に定着させて配筋を行うとともに、前記拡径端板と接合したもう一つの拡径端板と、他の端板との間にも、主筋の端部をこれらの端板に定着させて配筋を行い、然る後、該円筒型枠内にコンクリートを充填するとともに、前記主筋に緊張力を与えて遠心成形することを特徴とするものである。   The invention according to claim 2 of the present application has a shaft portion and a node portion having a diameter larger than that of the shaft portion, and introduces axial prestress by reinforcing bars connecting between end plates provided at both ends in the axial direction. And, at least one end is a method for producing a concrete joint pile for simultaneously producing a plurality of concrete joint piles having a diameter-increased end plate having a diameter larger than that of the shaft portion as the end plate. Using an openable / closable cylindrical frame having a plurality of node molding parts at predetermined intervals in the direction, an end plate set on one end side of the cylindrical frame and one of the node molding parts Between the diameter-expanded end plates, the end portions of the main bars are fixed to these end plates to perform bar arrangement, another diameter-expanded end plate joined to the diameter-expanded end plate, and another end plate In between, the ends of the main bars are fixed to these end plates, and the bars are arranged. To fill the concrete in the frame, it is characterized in that centrifugal molding giving tension to the main reinforcement.

本願発明では、拡径端板の外径がその拡径端板の取り付けられている軸部の外径より大きいため、一つの円筒型枠において同時に製造される複数（２本の場合が主）のコンクリート節杭のうち、隣り合う状態で製造されるコンクリート節杭の拡径端板を、１つの節部成形部分内にセットし、軸部径より外側でボルト接合、点溶接、挟着その他の接合方法により接合することができる。   In the present invention, since the outer diameter of the enlarged end plate is larger than the outer diameter of the shaft portion to which the enlarged end plate is attached, a plurality of (two main cases) manufactured simultaneously in one cylindrical frame. Of concrete concrete piles, the diameter expansion end plate of a concrete joint pile manufactured in an adjacent state is set in one joint molded part, and bolted, spot welded, sandwiched, etc. outside the shaft diameter It can join by the joining method.

その状態で、円筒型枠の一端でその端部側の端板を固定し、他端でその端部側の端板に緊張装置を接続し、コンクリートの充填後、緊張力を与えれば、複数のコンクリート節杭全長にわたって主筋を緊張することができる。   In that state, the end plate on the end side is fixed at one end of the cylindrical formwork, and a tension device is connected to the end plate on the end side at the other end. The main bars can be tensioned over the entire length of the concrete joint pile.

その後、請求項１と同様に、遠心成形、養生を行い、拡径端板どうしのボルト接合を解くことで複数本のコンクリート節杭を同時に製造することができる。   Thereafter, as in the first aspect, centrifugal concrete and curing are performed, and a plurality of concrete joint piles can be manufactured at the same time by releasing the bolt joint between the enlarged diameter end plates.

コンクリート節杭製造後の拡径端板の利用については、上述した請求項１の場合と同様である。   About the utilization of the diameter-expanded end plate after concrete joint pile manufacture, it is the same as that of the case of Claim 1 mentioned above.

請求項３は、請求項２に係るコンクリート節杭の製造方法において、前記節部成形部分の一つにセットした前記拡径端板と前記拡径端板と接合したもう一つの拡径端板の軸部の径より外側には複数の貫通孔が設けられており、これらの拡径端板どうしを前記貫通孔を利用してボルト接合する場合を限定したものである。   A third aspect of the present invention relates to the method for manufacturing a concrete pile according to claim 2, wherein the enlarged diameter end plate set in one of the node molded portions and another enlarged diameter end plate joined to the enlarged diameter end plate. A plurality of through holes are provided on the outer side of the diameter of the shaft portion, and the case where these enlarged diameter end plates are bolted together using the through holes is limited.

この場合、節部成形部分にセットされる拡径端板どうしの接合作業が極めて容易となり、成形後はボルトを外すことで同時に成形された複数本のコンクリート節杭どうしを容易に分離することができる。   In this case, it is very easy to join the expanded end plates set in the joint molding part, and after molding, it is possible to easily separate multiple concrete joint piles that are molded at the same time by removing the bolts. it can.

請求項４に係る発明は、軸部と該軸部より径が大きい節部とを有し、軸方向両端に設けられる端板間をつなぐ鉄筋により軸方向のプレストレスを導入してなり、かつ少なくとも一端は前記端板として軸部に対し該軸部より径の大きい拡径端板を設けてなるコンクリート節杭の製造方法であって、型枠軸方向に所定の間隔をおいて複数の節部成形部分を有する開閉可能な円筒型枠を用い、該円筒型枠の一端に形成されている軸部成形部分の端部外側に前記拡径端板を係止し、該円筒型枠内にセットした他の端板との間に、主筋の端部をこれらの端板に定着させて配筋を行い、然る後、該円筒型枠内にコンクリートを充填するとともに、前記主筋に緊張力を与えて遠心成形することを特徴とするものである。   The invention according to claim 4 has a shaft portion and a node portion having a larger diameter than the shaft portion, and introduces axial prestress by reinforcing bars connecting between end plates provided at both ends in the axial direction, and At least one end is a method for manufacturing a concrete pile having a diameter-increased end plate having a diameter larger than that of the shaft portion as the end plate, and a plurality of nodes are provided at predetermined intervals in the mold axis direction. Using an openable / closable cylindrical frame having a molded part, the enlarged end plate is locked to the outside of the end of the shaft molded part formed at one end of the cylindrical frame, Between the other end plates set, the ends of the main bars are fixed to these end plates, and then the reinforcing bars are placed. After that, the cylindrical frame is filled with concrete, and the main bars are tensioned. And is subjected to centrifugal molding.

この請求項４は、拡径端板の外径が軸部径より大きいことを利用して円筒型枠の端部に係止し、型枠の軸部成形部分と固定板との間に挟み込むようにして、固定側の端板（この場合は拡径端板）の型枠へ固定を容易にしたものである。   The fourth aspect of the present invention uses the fact that the outer diameter of the enlarged end plate is larger than the diameter of the shaft portion, so that it is locked to the end portion of the cylindrical mold frame and is sandwiched between the shaft molded portion of the mold frame and the fixed plate. In this manner, the fixing side end plate (in this case, the enlarged end plate) is easily fixed to the formwork.

なお、主筋の緊張状態では、固定側の拡径端板が円筒型枠の軸部成形部分の端面に密着するため、通常、充填したコンクリートの漏出等の問題はないが、緊張力を与える前の状態においてコンクリートの漏出等の恐れがある場合には、この部分にゴム製のパッキング材を介在させる等して対処することができる。   In addition, in the tension state of the main reinforcement, there is no problem such as leakage of the filled concrete because the fixed-side enlarged end plate is in close contact with the end surface of the shaft portion molding portion of the cylindrical frame, but before tension is applied If there is a risk of leakage of concrete in this state, it can be dealt with by interposing a rubber packing material in this portion.

請求項５は、請求項１〜４に係るＰＣ杭の製造方法において、前記拡径端板の外径が前記節部の外径とほぼ同一である場合を限定したものである。   A fifth aspect of the present invention is the PC pile manufacturing method according to any one of the first to fourth aspects, wherein a case where an outer diameter of the enlarged end plate is substantially the same as an outer diameter of the node portion is limited.

拡径端板の外径を節部の外径とほぼ同一とすることによる一番の利点は、拡径端板部分を節杭の節部の代用として利用できる点であり、杭の支持力の増大が図れる。   The biggest advantage of making the outer diameter of the expanded end plate almost the same as the outer diameter of the node is that the expanded end plate can be used as a substitute for the node of the node pile, and the bearing capacity of the pile Increase.

請求項６は、請求項１、２、４または５に係るコンクリート節杭の製造方法において、前記拡径端板の軸部の径より外側には複数の貫通孔が設けられている場合である。   Claim 6 is the case where a plurality of through holes are provided outside the diameter of the shaft portion of the enlarged end plate in the method for manufacturing a concrete pile according to claim 1, 2, 4 or 5. .

コンクリート節杭どうしあるいはコンクリート節杭と他の既製杭を接続する場合に、この貫通孔を利用して杭どうしをボルト接合することができる。その他、貫通孔を杭頭アンカー筋等の取り付けに利用することもできる。   When connecting concrete joint piles or concrete joint piles with other ready-made piles, the piles can be bolted together using this through hole. In addition, the through hole can be used for attaching a pile head anchor bar or the like.

請求項７は、請求項１〜６に係るコンクリート節杭の製造方法において、前記拡径端板がコンクリート節杭どうしまたはコンクリート節杭と他の既製杭をボルト接合するための接合プレートを兼ねている場合を限定したものである。   Claim 7 is a method for manufacturing concrete joint piles according to claims 1 to 6, wherein the expanded end plate also serves as a joint plate for bolting concrete joint piles between concrete joint piles or other ready-made piles. This is a limited case.

拡径端板が接合プレートを兼ねることで、製造されたコンクリート節杭自体は、特許文献３に記載されたものと同様の構成のものとなり、上下のコンクリート杭どうしを、ボルト接合により無溶接で接合できる。   Since the expanded end plate also serves as the joining plate, the manufactured concrete joint pile itself has the same configuration as that described in Patent Document 3, and the upper and lower concrete piles are welded together by bolt joining. Can be joined.

本願発明の場合、そのような構成のコンクリート節杭を、節杭製造用の円筒型枠を用いた遠心成形により、効率よく安価に製造することができる。   In the case of this invention, the concrete joint pile of such a structure can be manufactured efficiently and inexpensively by the centrifugal molding using the cylindrical form frame for joint pile manufacture.

請求項８は、請求項１〜６に係るコンクリート節杭の製造方法において、前記拡径端板が杭頭アンカー筋を取り付けるための接合プレートを兼ねている場合を限定したものである。   Claim 8 limits the case where the said enlarged diameter end plate serves also as the joining plate for attaching a pile head anchor reinforcement in the manufacturing method of the concrete joint pile concerning Claims 1-6.

拡径端板が単一のコンクリート節杭の杭頭部にくるように、あるいは拡径端板がコンクリート節杭どうしまたはコンクリート節杭と他の既製杭とを上下に連結した場合の杭頭部にくるようにすることで、その拡径端板の外周部に杭頭アンカー筋をボルト接合等により取り付けることができ、安定した杭頭接合部を効率よく安価に構築することができる。   Pile head when the enlarged end plate comes to the pile head of a single concrete joint pile, or when the enlarged end plate connects concrete joint piles or concrete joint piles and other ready-made piles up and down As a result, the pile head anchor bars can be attached to the outer peripheral portion of the enlarged end plate by bolt joining or the like, and a stable pile head joint can be constructed efficiently and inexpensively.

本願発明のコンクリート節杭の製造方法によれば、節杭製造用の円筒型枠を用いた遠心成形により、拡径端板を有するコンクリート節杭を効率よく製造することができる。また、従来の節杭製造用の円筒型枠を利用することもできるため、製造コストを抑えることができる。   According to the method for producing a concrete pile according to the present invention, a concrete pile having an enlarged end plate can be efficiently produced by centrifugal molding using a cylindrical frame for producing the pile. Moreover, since the conventional cylindrical form frame for knot pile manufacturing can also be utilized, manufacturing cost can be held down.

請求項２の場合、拡径端板を有するコンクリート節杭を複数本同時に製造することができ、また請求項３のように節部成形部分を利用した拡径端板どうしをボルト接合した場合には、プレストレスの導入および同時に成形された複数本のコンクリート節杭の分離が非常に容易となる。   In the case of claim 2, when a plurality of concrete joint piles having an enlarged end plate can be manufactured at the same time, and when the enlarged end plates using the node forming portion are bolted together as in claim 3 This makes it very easy to introduce prestress and to separate multiple concrete joint piles formed at the same time.

請求項４の場合、拡径端板を型枠の軸部成形部分と固定板との間に挟み込むようにして固定するため、固定側の端板の型枠へ固定が非常に簡単である。また、この場合、節部径より大径の端板を採用することもできる。   In the case of the fourth aspect, since the enlarged diameter end plate is fixed so as to be sandwiched between the shaft portion molding portion of the mold and the fixed plate, the fixing to the fixed end plate is very simple. In this case, an end plate having a diameter larger than the diameter of the node can be employed.

請求項５の場合、拡径端板の外径が節部の外径とほぼ同一であるため、拡径端板部分を節杭の節部の代用として利用でき、杭の支持力の増大が図れる。この場合、軸部径の外側でボルト接合するため、連結作業が容易である。   In the case of claim 5, since the outer diameter of the enlarged end plate is substantially the same as the outer diameter of the node portion, the enlarged end plate portion can be used as a substitute for the node portion of the node pile, and the support capacity of the pile is increased. I can plan. In this case, since the bolt connection is performed outside the shaft portion diameter, the connecting operation is easy.

請求項６の場合、貫通孔を杭どうしのボルト接合や杭頭アンカー筋の取り付けなどに利用することができる。   In the case of Claim 6, a through-hole can be utilized for the bolt joint of piles, the attachment of a pile head anchor reinforcement, etc.

請求項７は、拡径端板を節部としての機能を有する他、拡径端板を杭どうしを接合するための接合プレートとしても用いる場合であり、特許文献３記載の発明と同様、無溶接での既製杭どうしの接合が可能となる。   The seventh aspect is a case where the enlarged diameter end plate has a function as a node portion, and the enlarged diameter end plate is also used as a joining plate for joining the piles. Bonding of ready-made piles by welding is possible.

請求項８は、杭頭部に位置する拡径端板に杭頭アンカー筋を取り付ける場合であり、現場における杭頭施工を簡略化し、信頼性の高い杭頭接合部を実現することができる。   Claim 8 is a case where a pile head anchor reinforcement is attached to the enlarged diameter end plate located at the pile head, simplifies the pile head construction in the field, and realizes a highly reliable pile head joint.

以下、添付図面をもとに最良の形態としての実施形態について説明する。   Hereinafter, an embodiment as the best mode will be described with reference to the accompanying drawings.

図１は、本願発明の製造方法によって製造されるコンクリート節杭１の一形態を横倒しの状態で図示したものである。図示した例では、軸部１ａと所定間隔をおいて３つの節部１ｂが交互に形成され、両端に軸部１ａより径の大きい拡径端板２ａが取り付けられている。   FIG. 1 illustrates one form of a concrete pile 1 manufactured by the manufacturing method of the present invention in a state of being laid down. In the illustrated example, three node portions 1b are alternately formed with a predetermined interval from the shaft portion 1a, and a large-diameter end plate 2a having a diameter larger than that of the shaft portion 1a is attached to both ends.

杭体のコンクリート内には、主筋３ａとせん断補強筋としてのフープ筋３ｂが鉄筋籠の形で埋設されており、主筋３ａの端部が拡径端板２ａに定着された状態で緊張力が与えられており、プレテンション方式によるプレストレスが杭体のコンクリートに導入されている。   In the concrete of the pile body, the main bar 3a and the hoop bar 3b as a shear reinforcement bar are embedded in the form of a reinforcing bar, and the tension of the main bar 3a is fixed in the enlarged end plate 2a. The prestressing prestress is applied to the pile concrete.

本願発明におけるコンクリート節杭１の節部１ｂの数は１または２以上であり、特に限定されない。また、端板２は、図１のように両端とも拡径端板２ａの場合に限らず、一端のみが拡径端板２ａで、他端は軸部１ａの外径と同じ外径を有する通常の端板の場合もある。   The number of the node parts 1b of the concrete joint pile 1 in the present invention is 1 or 2 or more, and is not particularly limited. Further, the end plate 2 is not limited to the case of the enlarged end plate 2a at both ends as shown in FIG. 1, but only one end is the enlarged end plate 2a, and the other end has the same outer diameter as the outer diameter of the shaft portion 1a. It may be a normal end plate.

図２は、本願発明（請求項１に対応）における円筒型枠２１の下型枠２１ａの概要と緊張側の拡径端板２ａの具体的な一実施形態を示したものである。   FIG. 2 shows an outline of the lower mold 21a of the cylindrical mold 21 in the present invention (corresponding to claim 1) and a specific embodiment of the tension-side enlarged end plate 2a.

この円筒型枠２１は、上下半円状に２分割された閉合可能な型枠であり、製品の寸法によっては、従来の節杭の遠心成形用の円筒型枠をそのまま転用することもできる。図２はその下型枠２１ａ側を示したものである。   The cylindrical mold 21 is a mold that can be closed and divided into two upper and lower semicircular shapes, and depending on the dimensions of the product, a conventional cylindrical mold for centrifugal forming of joint piles can be used as it is. FIG. 2 shows the lower mold 21a side.

円筒型枠２１の内側には軸部成形部分２２と節部成形部分２３が交互に形成されており、両端が固定板１１ａ，１１ｂによって閉塞されている。また、円筒型枠２１の外周には所要間隔毎に遠心タイヤ２６が設けられている。   Inside the cylindrical frame 21, shaft portion forming portions 22 and node portion forming portions 23 are alternately formed, and both ends are closed by the fixing plates 11a and 11b. Further, a centrifugal tire 26 is provided on the outer periphery of the cylindrical frame 21 at every required interval.

この例で、図中、左端の拡径端板２ａは軸部成形部分２２の端部と固定板１１ａに挟まれた状態で固定されており、右側の拡径端板２ａは節部成形部分２３内にセットされている。必要に応じ、この部分に漏出を防止するためのゴム製のパッキング材２７等を挟み込む場合もある。   In this example, the left end enlarged diameter end plate 2a is fixed in a state sandwiched between the end of the shaft portion forming portion 22 and the fixed plate 11a, and the right end enlarged diameter end plate 2a is a node portion forming portion. 23 is set. If necessary, rubber packing material 27 or the like for preventing leakage may be sandwiched in this portion.

両側の拡径端板２ａ間には、鉄筋籠を構成する主筋３ａの端部が定着されており、図中右側の拡径端板２ａはボルト１５により緊張板１２に結合され、この状態で、下型枠２２内に所定量のコンクリートを充填する。   Between the enlarged end plates 2a on both sides, the end portion of the main reinforcing bar 3a constituting the reinforcing bar is fixed, and the enlarged end plate 2a on the right side in the figure is connected to the tension plate 12 by the bolt 15 in this state. The lower mold 22 is filled with a predetermined amount of concrete.

緊張板１２の背面側には緊張ロッド１３がねじ締結されており、上型枠を被せて閉じた後、緊張ロッド１３を介して主筋３ａを緊張した状態で、緊張ロッド１３をナット１４で右側の固定板１１ｂに係止し、従来と同様、遠心成形装置のローラ（図示せず）に載せて遠心成形する。遠心成形後は、蒸気養生等を併用することで、製品の脱型を早めることができる。   A tension rod 13 is screwed to the back side of the tension plate 12, and after closing the upper mold frame and closing the tension bar 13, the tension rod 13 is tightened to the right side with a nut 14 while the main muscle 3 a is tensioned. Is fixed to the fixing plate 11b, and is placed on a roller (not shown) of a centrifugal molding apparatus and centrifugally molded, as in the prior art. After centrifugal molding, product demolding can be accelerated by using steam curing or the like together.

図２(b) は、図２(a) のＡ部を拡大して示したものであり、図２(c) ，図２(d) は、さらにこのＡ部に配置された緊張側の拡径端板２ａの一形態を示したものである。この例で、拡径端板２ａはドーナツ状の端板本体部分と筒状の側板部５とから全体としてキャップ状の形態を有し、側板部５には後から充填されるコンクリートとの一体性を高めるために凹凸５ａが形成されている。   2 (b) is an enlarged view of part A of FIG. 2 (a). FIGS. 2 (c) and 2 (d) are further enlarged on the tension side arranged in this A part. One form of the diameter end plate 2a is shown. In this example, the enlarged diameter end plate 2a has a cap-like form as a whole from the donut-shaped end plate main body portion and the cylindrical side plate portion 5, and the side plate portion 5 is integrated with concrete to be filled later. The unevenness 5a is formed in order to improve the property.

拡径端板の本体部分には図２(c) に示すように複数のひょうたん状の孔６が形成され、さらに外周部に複数の貫通孔７が形成されている。なお、ひょうたん状の孔６は、ヘッディング加工の施された主筋の端部（ヘッド部）を係止して定着させ、さらに緊張力を導入する際に緊張板と端板をボルト接合するために、従来からＰＣ杭の製造において多用されているものである。   As shown in FIG. 2 (c), a plurality of gourd-shaped holes 6 are formed in the main body portion of the enlarged diameter end plate, and a plurality of through holes 7 are formed in the outer peripheral portion. The gourd-shaped hole 6 is used for locking and fixing the end portion (head portion) of the main muscle subjected to heading processing, and for joining the tension plate and the end plate with bolts when introducing tension. Conventionally, it is frequently used in the manufacture of PC piles.

このひょうたん状の孔６は、主筋３ａのヘッド部より径の大きい挿通孔６ａと、ヘッド部を係止するための係止孔６ｂとを連通させたものであり、挿通孔６ａに通した主筋３ａを係止孔６ａ側へスライドさせて主筋３ａのヘッド部を定着させる。   The gourd-shaped hole 6 is formed by connecting an insertion hole 6a having a diameter larger than the head portion of the main muscle 3a and a locking hole 6b for locking the head portion, and the main muscle passed through the insertion hole 6a. 3a is slid toward the locking hole 6a to fix the head portion of the main muscle 3a.

係止孔６ｂについてはテーパーをつけたり、段部を形成することで、主筋３ａのヘッド部が拡径端板２ａの表面から突出しないようにすることができる。また、挿通孔６ａは雌ねじを切っておくことで、拡径端板２ａと緊張板１２を結合するためのボルト１５を止め付けることができる。   The locking hole 6b can be tapered or formed with a step portion so that the head portion of the main bar 3a does not protrude from the surface of the enlarged diameter end plate 2a. Moreover, the insertion hole 6a can stop the volt | bolt 15 for couple | bonding the enlarged diameter end plate 2a and the tension | tensile_strength board 12 by cutting off the internal thread.

拡径端板２ａの外周部の貫通孔７は、用途に応じてコンクリート節杭どうしまたはコンクリート節杭と他の既製杭とをボルト接合するためのボルト孔として利用したり、あるいは杭頭部における杭頭アンカー筋の取付け等に利用することができる。   The through-hole 7 in the outer peripheral portion of the expanded end plate 2a is used as a bolt hole for bolting concrete joint piles or between concrete joint piles and other ready-made piles depending on the use, or in the pile head It can be used for mounting pile head anchors.

図３は、拡径端板２ａを有するコンクリート節杭を複数本（通常は２本）同時に製造する場合（請求項２に対応）において、下型枠２１ａに拡径端板２ａや主筋３ａおよびフープ筋３ｂからなる鉄筋籠をセットした状態を示したものである。   FIG. 3 shows a case where a plurality of (normally two) concrete joint piles having an enlarged end plate 2a are manufactured at the same time (corresponding to claim 2), the enlarged end plate 2a and the main reinforcement 3a The state which set the reinforcing bar rod which consists of hoop bars 3b is shown.

この図３の例では、円筒型枠２１の節部成形部分２３のうち中間の一つについて、前述した図２(c) ，(d) に示したものと同様の拡径端板２ａを２枚セットし、貫通孔７に通したボルト１６により２枚の拡径端板２ａどうしを結合することで、成形される２本のコンクリート節杭の鉄筋籠（主筋３ａ）どうしを２枚の拡径端板２ａを介して連続させる。   In the example of FIG. 3, an enlarged end plate 2a similar to that shown in FIGS. 2 (c) and 2 (d) is provided for one of the intermediate portions 23 of the cylindrical part 21 of the cylindrical frame 21. The two expanded end plates 2a are connected to each other by bolts 16 passed through the through-holes 7 so that the two reinforcing rods (main bars 3a) of the concrete joint piles to be formed are expanded. It continues via the diameter end plate 2a.

その状態で、図２の実施形態の場合と同様に、緊張ロッド１３を介して２つの鉄筋籠全長に渡って主筋３ａに緊張力を導入した後、コンクリートを充填し、養生を行う。   In this state, as in the case of the embodiment of FIG. 2, after introducing tension to the main bar 3a over the entire length of the two reinforcing bar rods via the tension rod 13, concrete is filled and curing is performed.

図３の例では、円筒型枠２１に節部成形部分２３が長手方向に間隔をおいて５箇所設けられており、そのうちの、中央の節部成形部分２３に２枚の拡径端板２ａをセットし、図中、右端の節部成形部分２３に、図２と同様の形態で１枚の拡径端板２ａをセットしている。   In the example of FIG. 3, the cylindrical frame 21 is provided with five node forming portions 23 at intervals in the longitudinal direction, and two of the enlarged diameter end plates 2a are provided in the central node forming portion 23. In the figure, one enlarged diameter end plate 2a is set in the same manner as in FIG.

このような拡径端板２ａの配置は、同時に製造される２本または２本以上のコンクリート節杭の節部の数、形態等によって、任意に変更可能である。   Such an arrangement of the diameter-expanded end plates 2a can be arbitrarily changed depending on the number, form, etc. of the two or more concrete joint piles manufactured at the same time.

また、図３は、同時に成形される２本のコンクリート節杭のそれぞれ両端に拡径端板２ａが設けられる場合であるが、製造の際にお互いにボルト１６で接合される拡径端板２ａ以外の端板については、拡径端板ではなく通常の寸法の端板（軸部径に併せたもの）でもよい。   Moreover, FIG. 3 is a case where the diameter expansion end plate 2a is provided in both ends of two concrete joint piles shape | molded simultaneously, but the diameter expansion end plate 2a mutually joined by the volt | bolt 16 in the case of manufacture. The end plate other than the above may be an end plate of normal size (combined with the diameter of the shaft portion) instead of the enlarged diameter end plate.

図４は、一端のみ拡径端板２ａを有するコンクリート節杭を円筒型枠２１を用いて製造する場合の他の方法（請求項４に対応）を示したものである。   FIG. 4 shows another method (corresponding to claim 4) in the case of manufacturing a concrete joint pile having an enlarged end plate 2a only at one end using the cylindrical frame 21.

この例では、円筒型枠２１の節部成形部分２３を利用せず、図中、左端の拡径端板２ａの外周部を軸部成形部分２２の端部に係止し、右側の端板は軸部径に合わせた端板２であるため、従来のコンクリート節杭の製造の場合と同様に端部の軸部成形部分２２内でボルト１５により緊張板１２と結合している。ただし、コンクリート節杭の長さや節部のスパンとの関係では、端板２を節部成形部分２３内にセットする場合もある。   In this example, the node forming portion 23 of the cylindrical frame 21 is not used, and in the drawing, the outer peripheral portion of the left end enlarged diameter end plate 2a is locked to the end portion of the shaft forming portion 22, and the right end plate is secured. Since it is the end plate 2 matched with the diameter of the shaft portion, it is connected to the tension plate 12 by the bolt 15 in the shaft portion forming portion 22 at the end portion as in the case of manufacturing a conventional concrete joint pile. However, the end plate 2 may be set in the node forming portion 23 in relation to the length of the concrete node pile and the span of the node.

緊張ロッド１３による緊張および遠心成形については、図２、図３の場合と同様である。なお、図４の例では左端の拡径端板２ａについて、固定板１１ａと結合するためのボルトは使用しておらず、主筋３ａのヘッド部４が拡径端板２ａに定着された状態で、前述のように拡径端板２ａの外周部分が軸部成形部分２２の端部に係止されている。図２、図３の実施形態についても、ボルト１５を使用せず、図４の場合と同様に、拡径端板２ａの外周部分を軸部成形部分２２の端部に係止するだけでもよい。   About the tension | tensile_strength by the tension | tensile_strength rod 13, and centrifugal molding, it is the same as that of the case of FIG. 2, FIG. In the example of FIG. 4, the bolt for joining the fixed plate 11 a is not used for the left-end enlarged diameter end plate 2 a, and the head portion 4 of the main bar 3 a is fixed to the enlarged diameter end plate 2 a. As described above, the outer peripheral portion of the enlarged diameter end plate 2 a is locked to the end portion of the shaft forming portion 22. In the embodiment of FIGS. 2 and 3 as well, the bolt 15 is not used and the outer peripheral portion of the enlarged diameter end plate 2a may be merely locked to the end portion of the shaft portion molding portion 22 as in the case of FIG. .

図５は、本願発明の製造方法によって製造されるコンクリート節杭１どうしを拡径端板２ａを利用して、上下方向に複数本連結した場合の一例を示したものである。   FIG. 5 shows an example in which a plurality of concrete joint piles 1 manufactured by the manufacturing method of the present invention are connected in the vertical direction using the enlarged diameter end plate 2a.

主筋３ａのヘッド部４が定着されている拡径端板２ａの外周部に貫通孔７が形成されているため、特許文献３記載の発明と同様に、拡径端板２ａどうしをボルト１６により直接ボルト接合することができる。   Since the through-hole 7 is formed in the outer peripheral portion of the enlarged diameter end plate 2a to which the head portion 4 of the main bar 3a is fixed, the enlarged diameter end plates 2a are connected to each other by bolts 16 as in the invention described in Patent Document 3. Can be bolted directly.

すなわち、コンクリート節杭１の軸部径より大径の拡径端板２ａどうしのボルト接合により、軸部径の外側で杭どうしの連結を行うことができるため、作業が容易であり、かつ十分な接合強度を得やすいという利点がある。   That is, since the piles can be connected to each other outside the shaft diameter by bolting the enlarged end plates 2a having a diameter larger than the shaft diameter of the concrete joint pile 1, the work is easy and sufficient. There is an advantage that easy joining strength can be easily obtained.

また、拡径端板２ａの外径を節部１ｂの外径とほぼ同一とすることで、図５(a) における端板２ａを節部１ｂの代用として利用することができ、さらに複数のコンクリート節杭１を接続してなる基礎杭先端の拡径端板２ａは、先端支持力の増大に貢献する。   Further, by making the outer diameter of the enlarged diameter end plate 2a substantially the same as the outer diameter of the node portion 1b, the end plate 2a in FIG. 5 (a) can be used as a substitute for the node portion 1b. The diameter-expanded end plate 2a at the tip of the foundation pile formed by connecting the concrete joint pile 1 contributes to an increase in the tip support force.

なお、コンクリート節杭１どうしの連結の場合に限らず、コンクリート節杭１と他の既製杭との連結にも利用することができる。   In addition, it can utilize also for the connection of the concrete joint pile 1 and another ready-made pile not only in the case of the connection of the concrete joint pile 1.

図６は、本願発明の製造方法によって製造されるコンクリート節杭１の適用例として、拡径端板２ａを杭頭アンカー筋３１の定着に利用した場合を示したもので、下端にねじを有する杭頭アンカー筋３１（異形ねじ鉄筋などを用いることもできる）をナット３２の締め付けにより固定している。   FIG. 6 shows a case where the enlarged end plate 2a is used for fixing the pile head anchor bars 31 as an application example of the concrete joint pile 1 manufactured by the manufacturing method of the present invention, and has a screw at the lower end. A pile head anchor bar 31 (a deformed threaded reinforcing bar or the like can also be used) is fixed by tightening a nut 32.

この場合、軸部径より大径の拡径端板２ａに対して接合するため、接合作業が容易である他、アンカー筋３１が軸部径より外側に配置されることで、力学的にも有利となる。   In this case, since it joins with respect to the diameter-expanded end plate 2a having a diameter larger than the shaft portion diameter, the joining work is easy, and the anchor bars 31 are arranged outside the shaft portion diameter, so It will be advantageous.

さらに、図６(c) のようにバネ３３を介して固定し、杭頭鉄筋３１を上下方向に変位可能とすれば、低固定度の杭頭接合部が形成され、杭頭部に過大なせん断力が作用しないようにすることができる。   Furthermore, if it fixes through the spring 33 as shown in FIG.6 (c), and the pile head reinforcement 31 can be displaced to an up-down direction, a pile head junction part of a low fixed degree will be formed, and an excessively large pile head will be formed. The shearing force can be prevented from acting.

図７は、本願発明の製造方法によって製造されるコンクリート節杭１の他の適用例として、コンクリート節杭１の上部に場所打ち杭４１（コンクリート打設前の状態を図示）を一体化する場合を示したものである。   FIG. 7 shows a case where a cast-in-place pile 41 (shown before concrete placement) is integrated with the upper portion of the concrete joint pile 1 as another application example of the concrete joint pile 1 manufactured by the manufacturing method of the present invention. Is shown.

このように、コンクリート節杭１を下杭としてその上部に上杭としての場所打ち杭４１を連結する場合、軸部径より大径の拡径端板２ａの外周部に場所打ち杭４１の主筋４２ａ（異形棒鋼を用いることもできる）を接合し、場所打ち杭４１と一体化した基礎杭を形成させることもできる。   Thus, when the cast-in-place pile 41 as the upper pile is connected to the upper part of the concrete joint pile 1 as the lower pile, the main reinforcement of the cast-in-place pile 41 on the outer peripheral portion of the enlarged end plate 2a having a diameter larger than the shaft diameter. 42a (a deformed steel bar can also be used) is joined, and the foundation pile integrated with the cast-in-place pile 41 can also be formed.

図８は、節部径６５０ｍｍ、軸部径５００ｍｍで、拡径端板の外径が６２０ｍｍ、端板板厚が１９ｍｍの場合である。この場合、拡径端板は、節部内において最大８６ｍｍ移動可能である。プレテンション方式でプレストレスを導入する場合の緊張時の主筋の延びを杭長の５％と仮定する。   FIG. 8 shows a case where the node diameter is 650 mm, the shaft diameter is 500 mm, the outer diameter of the enlarged end plate is 620 mm, and the end plate thickness is 19 mm. In this case, the diameter-expanded end plate can move up to 86 mm within the node. It is assumed that the extension of the main bar during tension when prestress is introduced by the pretension method is 5% of the pile length.

製造する杭の長さが１５ｍであるとすると、１個の節部成形部分内で拡径端板が移動する距離は７５ｍｍとなるが、最大８６ｍｍの移動が可能であるため、十分に対応可能である。   If the length of the pile to be manufactured is 15 m, the distance that the enlarged end plate moves within one nodal molded part will be 75 mm, but it can move up to 86 mm, so it can be handled sufficiently. It is.

図９は、主筋緊張時の節部成形部分２３内での拡径端板２ａの移動可能範囲と拡径端板２ａの側板部５の長さとの関係を示した図である。この図は、節部外径が６５０ｍｍ、軸部外径が５００ｍｍで、拡径端板の外径が６２０ｍｍ、端板板厚が１９ｍｍの場合であるが、コンクリートの充填の際、拡径端板２ａ部分からコンクリートが節部成形部分２３内に漏れ出ないためには、側板部５の長さ（スカート長）が１６５ｍｍ程度以上であることが望ましく、２００ｍｍあれば十分である。   FIG. 9 is a view showing the relationship between the movable range of the enlarged diameter end plate 2a in the node forming portion 23 and the length of the side plate portion 5 of the enlarged diameter end plate 2a during main muscle tension. This figure shows a case where the outer diameter of the node is 650 mm, the outer diameter of the shaft is 500 mm, the outer diameter of the expanded end plate is 620 mm, and the thickness of the end plate is 19 mm. In order to prevent the concrete from leaking from the plate 2a portion into the node forming portion 23, the length (skirt length) of the side plate portion 5 is desirably about 165 mm or more, and 200 mm is sufficient.

本願発明の製造方法によって製造されるコンクリート節杭の一形態を示す横倒しの状態での正面図（一部切欠き断面図）である。It is a front view (partially cutaway sectional view) in the state of lying down showing one form of the concrete joint pile manufactured by the manufacturing method of the present invention. (a) は本願発明の一実施形態（請求項１）における型枠の下型枠部分の平面図、(b) はＡ部の拡大図、(c) は緊張側の拡径端板の一形態を示す正面図、(d) はその側面図である。(a) is a plan view of the lower mold part of the mold according to an embodiment of the present invention (Claim 1), (b) is an enlarged view of part A, and (c) is an enlarged end plate on the tension side. The front view which shows a form, (d) is the side view. (a) は本願発明の他の実施形態（請求項２）における型枠の下型枠部分の平面図、(b) はＢ部の拡大図である。(a) is a top view of the lower mold part of the formwork in other embodiment (Claim 2) of this invention, (b) is an enlarged view of the B section. 本願発明の他の実施形態（請求項４）における一端のみ拡径端板を有するコンクリート節杭の他の製造方法の一例を示す型枠の下型枠部分の平面図（部分的に上型枠部分も表示）である。The top view (partly upper formwork) which shows an example of the other manufacturing method of the concrete joint pile which has an enlarged end plate only at one end in other embodiment of this invention (Claim 4) Part is also displayed). (a) は本願発明の製造方法によって製造されるコンクリート節杭どうしを上下方向に複数本連結した場合の一例を示す正面図、(b) は拡径端板どうしの連結部分の拡大断面図である。(a) is a front view showing an example of a case where a plurality of concrete joint piles manufactured by the manufacturing method of the present invention are connected in the vertical direction, and (b) is an enlarged cross-sectional view of a connecting portion between expanded diameter end plates. is there. 本願発明の製造方法によって製造されるコンクリート節杭の適用例として、拡径端板を杭頭アンカー筋の定着に利用した場合を示したものであり、(a) は杭頭部の形態の一例を示す正面図、(b) はその平面図、(c) は杭頭部の他の形態を示す正面図である。As an application example of a concrete joint pile manufactured by the manufacturing method of the present invention, it shows a case where an enlarged end plate is used for anchoring a pile head anchor bar, and (a) is an example of a form of a pile head (B) is the top view, (c) is a front view which shows the other form of a pile head. 本願発明の製造方法によって製造されるコンクリート節杭の適用例として、コンクリート節杭の上部に場所打杭を一体化する場合を示したものであり、(a) は全体の概要を示す鉛直断面図、(b) はコンクリート節杭と場所打杭の接続部の構造を示す鉛直断面図である。As an application example of a concrete pile pile manufactured by the production method of the present invention, a case where a cast-in-place pile is integrated with the upper part of a concrete pile pile is shown, (a) is a vertical sectional view showing an overview of the whole , (B) is a vertical cross-sectional view showing the structure of the joint between the concrete joint pile and cast-in-place pile. 本願発明の製造方法における主筋緊張時の節部成形部分内での拡径端板の移動可能範囲と、製造可能な杭長との関係を説明するための図である。It is a figure for demonstrating the relationship between the movable range of the diameter-expansion end plate in the node formation part at the time of main muscle tension in the manufacturing method of this invention, and the pile length which can be manufactured. 主筋緊張時の節部成形部分内での拡径端板の移動可能範囲と拡径端板の側板部の長さ（スカート長）との関係を説明するための図である。It is a figure for demonstrating the relationship between the movable range of the enlarged diameter end plate in the node formation part at the time of main muscle tension, and the length (skirt length) of the side plate part of an enlarged diameter end plate.

符号の説明Explanation of symbols

１…コンクリート節杭、１ａ…軸部、１ｂ…節部、２…端板、２ａ…拡径端板、３ａ…主筋、３ｂ…フープ筋、４…ヘッド部、５…側板部、５ａ…凹凸、６…ひょうたん状の孔、６ａ…挿通孔、６ｂ…係止孔、７…貫通孔、
１１ａ，１１ｂ…固定板、１２…緊張板、１３…緊張ロッド、１４…ナット、１５…ボルト、１６…ボルト、１７…ナット、
２１…円筒型枠、２１ａ…下型枠、２１ｂ…上型枠、２２…軸部成形部分、２３…節部成形部分、２４…固定板、２５…固定板、２６…遠心タイヤ、２７…パッキング材、
３１…杭頭アンカー筋、３２…ナット、３３…バネ、
４１…場所打ち杭、４２…鉄筋籠、４２ａ…主筋、４２ｂ…フープ筋
DESCRIPTION OF SYMBOLS 1 ... Concrete joint pile, 1a ... Shaft part, 1b ... Node part, 2 ... End plate, 2a ... Expanded end plate, 3a ... Main reinforcement, 3b ... Hoop reinforcement, 4 ... Head part, 5 ... Side plate part, 5a ... Unevenness 6 ... Gourd-shaped hole, 6a ... Insertion hole, 6b ... Locking hole, 7 ... Through-hole,
11a, 11b ... fixed plate, 12 ... tension plate, 13 ... tension rod, 14 ... nut, 15 ... bolt, 16 ... bolt, 17 ... nut,
DESCRIPTION OF SYMBOLS 21 ... Cylindrical formwork, 21a ... Lower formwork, 21b ... Upper formwork, 22 ... Shaft part formation part, 23 ... Node part formation part, 24 ... Fixed plate, 25 ... Fixed plate, 26 ... Centrifugal tire, 27 ... Packing Material,
31 ... Pile head anchor muscle, 32 ... Nut, 33 ... Spring,
41 ... Cast-in-place pile, 42 ... Reinforcing bar, 42a ... Main reinforcement, 42b ... Hoop reinforcement

Claims (8)

軸部と該軸部より径が大きい節部とを有し、軸方向両端に設けられる端板間をつなぐ鉄筋により軸方向のプレストレスを導入してなり、かつ少なくとも一端は前記端板として軸部に対し該軸部より径の大きい拡径端板を設けてなるコンクリート節杭の製造方法であって、型枠軸方向に所定の間隔をおいて複数の節部成形部分を有する開閉可能な円筒型枠を用い、該円筒型枠の一端側にセットした端板と、前記節部成形部分の一つにセットした前記拡径端板との間に、主筋の端部をこれらの端板に定着させて配筋を行い、然る後、該円筒型枠内にコンクリートを充填するとともに、前記主筋に緊張力を与えて遠心成形することを特徴とするコンクリート節杭の製造方法。   It has a shaft portion and a node portion having a diameter larger than that of the shaft portion, and axial prestress is introduced by a reinforcing bar connecting between end plates provided at both ends in the axial direction, and at least one end serves as the end plate. A method of manufacturing a concrete joint pile having an enlarged end plate having a diameter larger than that of the shaft portion with respect to the portion, which can be opened and closed with a plurality of joint forming portions at predetermined intervals in the mold axis direction Using the cylindrical form, between the end plate set on one end side of the cylindrical form and the enlarged end plate set on one of the node forming parts, the end of the main bar is the end plate. A method for producing a concrete pile, characterized in that the bar is fixed and placed, and then the concrete is filled into the cylindrical frame, and the main bar is tensioned and centrifugally formed. 軸部と該軸部より径が大きい節部とを有し、軸方向両端に設けられる端板間をつなぐ鉄筋により軸方向のプレストレスを導入してなり、かつ少なくとも一端は前記端板として軸部に対し該軸部より径が大きい拡径端板を設けてなるコンクリート節杭を複数本同時に製造するコンクリート節杭の製造方法であって、型枠軸方向に所定の間隔をおいて複数の節部成形部分を有する開閉可能な円筒型枠を用い、該円筒型枠の一端側にセットした端板と、前記節部成形部分の一つにセットした前記拡径端板との間に、主筋の端部をこれらの端板に定着させて配筋を行うとともに、前記拡径端板と接合したもう一つの拡径端板と、他の端板との間にも、主筋の端部をこれらの端板に定着させて配筋を行い、然る後、該円筒型枠内にコンクリートを充填するとともに、前記主筋に緊張力を与えて遠心成形することを特徴とするコンクリート節杭の製造方法。   It has a shaft portion and a node portion having a diameter larger than that of the shaft portion, and axial prestress is introduced by a reinforcing bar connecting between end plates provided at both ends in the axial direction, and at least one end serves as the end plate. A method for manufacturing a concrete joint pile that simultaneously produces a plurality of concrete joint piles having an enlarged end plate having a diameter larger than that of the shaft portion with respect to the portion, wherein the plurality of concrete joint piles are spaced apart at predetermined intervals in the mold axis direction. Using an openable and closable cylindrical frame having a node molded part, between the end plate set on one end side of the cylindrical frame and the enlarged end plate set on one of the node molded parts, The end of the main bar is placed between the other enlarged end plate and the other enlarged end plate while fixing the end of the main bar to these end plates and arranging the bars. Are fixed to these end plates, and after that, the concrete is filled into the cylindrical frame. Together, the manufacturing method of the concrete section piles, characterized in that the centrifugal molding giving tension to the main reinforcement. 前記節部成形部分の一つにセットした前記拡径端板と前記拡径端板と接合したもう一つの拡径端板の軸部の径より外側には複数の貫通孔が設けられており、これらの拡径端板どうしを前記貫通孔を利用してボルト接合する請求項２記載のコンクリート節杭の製造方法。   A plurality of through holes are provided outside the diameter of the shaft portion of the enlarged diameter end plate set to one of the node forming portions and another enlarged diameter end plate joined to the enlarged diameter end plate. The method for producing a concrete pile according to claim 2, wherein the enlarged end plates are bolted together using the through holes. 軸部と該軸部より径が大きい節部とを有し、軸方向両端に設けられる端板間をつなぐ鉄筋により軸方向のプレストレスを導入してなり、かつ少なくとも一端は前記端板として軸部に対し該軸部より径の大きい拡径端板を設けてなるコンクリート節杭の製造方法であって、型枠軸方向に所定の間隔をおいて複数の節部成形部分を有する開閉可能な円筒型枠を用い、該円筒型枠の一端に形成されている軸部成形部分の端部外側に前記拡径端板を係止し、該円筒型枠内にセットした他の端板との間に、主筋の端部をこれらの端板に定着させて配筋を行い、然る後、該円筒型枠内にコンクリートを充填するとともに、前記主筋に緊張力を与えて遠心成形することを特徴とするコンクリート節杭の製造方法。   It has a shaft portion and a node portion having a diameter larger than that of the shaft portion, and axial prestress is introduced by a reinforcing bar connecting between end plates provided at both ends in the axial direction, and at least one end serves as the end plate. A method of manufacturing a concrete joint pile having an enlarged end plate having a diameter larger than that of the shaft portion with respect to the portion, which can be opened and closed with a plurality of joint forming portions at predetermined intervals in the mold axis direction Using the cylindrical form frame, the diameter-enlarged end plate is locked to the outside of the end portion of the shaft part formed at one end of the cylindrical form frame, and the other end plate set in the cylindrical form frame. In between, the ends of the main bars are fixed on these end plates, and then the bars are arranged. Thereafter, the cylindrical frame is filled with concrete, and the main bars are subjected to centrifugal force forming tension. A method for producing a concrete piling as a feature. 前記拡径端板の外径が前記節部の外径とほぼ同一である請求項１〜４のいずれか１項記載のコンクリート節杭の製造方法。   The method for manufacturing a concrete pile according to any one of claims 1 to 4, wherein an outer diameter of the enlarged end plate is substantially the same as an outer diameter of the node. 前記拡径端板の軸部の径より外側には複数の貫通孔が設けられている請求項１、２、４または５記載のコンクリート節杭の製造方法。   The method for producing a concrete pile according to claim 1, wherein a plurality of through holes are provided outside the diameter of the shaft portion of the enlarged diameter end plate. 前記拡径端板がコンクリート節杭どうしまたはコンクリート節杭と他の既製杭をボルト接合するための接合プレートを兼ねている請求項１〜６のいずれか１項記載のコンクリート節杭の製造方法。   The method for producing a concrete pile according to any one of claims 1 to 6, wherein the expanded end plate also serves as a joint plate for bolting concrete joint piles or concrete joint piles and other ready-made piles. 前記拡径端板が杭頭アンカー筋を取り付けるための接合プレートを兼ねている請求項１〜６のいずれか１項記載のコンクリート節杭の製造方法。
The method for manufacturing a concrete pile according to any one of claims 1 to 6, wherein the enlarged end plate also serves as a joining plate for attaching a pile head anchor bar.
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