JP7063877B2

JP7063877B2 - Concrete skeleton molding method and counterbore

Info

Publication number: JP7063877B2
Application number: JP2019231127A
Authority: JP
Inventors: 亨山川; 康則谷中; 聡史柴
Original assignee: Ｓｍｃプレコンクリート株式会社
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2022-05-09
Anticipated expiration: 2039-12-23
Also published as: JP2021098980A

Description

本発明は、コンクリートにインサートを埋め込みつつその埋め込み位置でインサートに通じる座堀穴をコンクリート表面に形成するコンクリート躯体の成形方法、および、コンクリートに埋め込まれたインサートの埋め込み位置でインサートに通じる座堀穴をコンクリートの表面に形成するための座堀具に関する。 The present invention is a method for forming a concrete skeleton in which an insert is embedded in concrete and a counterbore hole leading to the insert is formed on the concrete surface at the embedding position, and a counterbore hole leading to the insert at the embedding position of the insert embedded in concrete. Regarding a counterbore for forming on the surface of concrete.

従来から、コンクリートにインサートを埋め込み、このインサートにボルト等の取り付け金具を締結して、この取り付け金具を介して様々な部材や設備等をコンクリート躯体に付設させることがなされている（例えば、特許文献１参照）。また、このようなコンクリート中へのインサートの埋め込みにおいては、その埋め込み位置でインサートに通じる座堀穴がコンクリート表面に形成されている場合、インサートに取り付け金具を締結した後、座堀穴にモルタル等の充填材を埋め込み充填してコンクリート躯体の表面を平滑に仕上げるようにしている。 Conventionally, an insert has been embedded in concrete, a mounting bracket such as a bolt is fastened to the insert, and various members and equipment are attached to the concrete skeleton via the mounting bracket (for example, Patent Documents). 1). Further, in such embedding of an insert in concrete, if a counterbore hole leading to the insert is formed on the concrete surface at the embedding position, after fastening the mounting bracket to the insert, mortar or the like is formed in the counterbore hole. The filling material is embedded and filled to make the surface of the concrete skeleton smooth.

国際公開第２０１５／００８３６６号International Publication No. 2015/008366

しかしながら、座堀穴に埋め込まれる充填材は、経年劣化や施工不良等に起因して座堀穴から脱落するような事態が生じ得る。そのような事態は、特にコンクリート躯体が高層建物の側壁等を形成している場合には問題となり、早急な回避策が求められる。 However, the filler embedded in the counterbore may fall off from the counterbore due to deterioration over time, poor construction, or the like. Such a situation becomes a problem especially when the concrete skeleton forms a side wall of a high-rise building, and an immediate workaround is required.

本発明は前記事情に鑑みてなされたもので、埋め込みインサートに通じるコンクリート表面の座堀穴からの充填材の脱落を防止できるコンクリート躯体成形方法および座堀具を提供することを目的とする。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a concrete skeleton forming method and a counterbore tool capable of preventing the filler from falling off from the counterbore hole on the concrete surface leading to the embedded insert.

前記目的を達成するために、本発明は、コンクリートにインサートを埋め込みつつその埋め込み位置で前記インサートに通じる座堀穴をコンクリート表面に形成するコンクリート躯体の成形方法であって、
弾性材料により形成される第１の座堀形成具と鋼製の第２の座堀形成具とを組み合わせて成る座堀具を前記インサートと共に締結具を用いて型枠に締結固定する締結固定ステップと、
前記座堀具と前記インサートとが前記締結具により前記型枠に締結固定された状態で、前記型枠にコンクリートを流し込むコンクリート打設ステップと、
前記コンクリートの硬化後に、前記締結具による締結状態を解除することにより、前記座堀具を伴って前記インサートが埋め込まれて成るコンクリート成形体を前記型枠から取り外す脱型ステップと、
前記コンクリート成形体から取り外し治具を用いて前記座堀具を取り外す座堀具取り外しステップと、
を含み、
前記第１の座堀形成具は、筒状を成すとともに、前記型枠に当接される第１の端面と、その反端側の第２の端面と、前記第１の端面と前記第２の端面とを接続する外周側面とを有し、前記外周側面は、前記第２の端面から前記第１の端面へ向けて先細るテーパ形状を成し、
前記第２の座堀形成具は、前記第１の座堀形成具の内孔に嵌合する嵌合部を有して、前記外周側面により規定される前記第１の座堀形成具の外径の内側に収まるように前記第１の座堀形成具に組み付けられ、
前記締結固定ステップでは、前記第１の座堀形成具の前記第１の端面が前記型枠に当接された状態で前記座堀具が前記インサートと組み付けられて前記締結具により前記型枠に締結固定され、
前記座堀具取り外しステップでは、前記第２の座堀形成具に取り付けた前記取り外し治具による前記座堀具の取り外し時に、前記第１の座堀形成具が弾性的に圧縮変形されつつ前記座堀具が前記コンクリート成形体から取り外されることにより、コンクリートに埋め込まれたままの前記インサートに通じる座堀穴が前記コンクリート成形体の表面へ向けて先細るように開口して形成される、
ことを特徴とする。 In order to achieve the above object, the present invention is a method for forming a concrete skeleton in which an insert is embedded in concrete and a counterbore hole leading to the insert is formed on the concrete surface at the embedded position.
Fastening and fixing step of fastening and fixing a counterbore formed by combining a first counterbore forming tool formed of an elastic material and a second counterbore forming tool made of steel to a formwork using a fastener together with the insert. When,
A concrete placing step of pouring concrete into the formwork in a state where the counterbore and the insert are fastened and fixed to the formwork by the fastener.
After the concrete is hardened, the demolding step of removing the concrete molded body in which the insert is embedded with the counterbore from the formwork by releasing the fastening state by the fastener.
A step of removing the counterbore from the concrete molded body using a removal jig, and a step of removing the counterbore.
Including
The first counterbore forming tool has a cylindrical shape, and has a first end surface that is in contact with the formwork, a second end surface on the opposite end side thereof, the first end surface, and the second end surface. The outer peripheral side surface has an outer peripheral side surface that connects to the end face of the above, and the outer peripheral side surface forms a tapered shape that tapers from the second end face toward the first end face.
The second counterbore forming tool has a fitting portion that fits into the inner hole of the first counterbore forming tool, and is outside the first counterbore forming tool defined by the outer peripheral side surface. It is attached to the first counterbore forming tool so that it fits inside the diameter.
In the fastening fixing step, the counterbore is assembled with the insert in a state where the first end surface of the first counterbore forming tool is in contact with the formwork, and the fastener is used to the formwork. Fastened and fixed,
In the counterbore removal step, when the counterbore is removed by the removal jig attached to the second counterbore, the first counterbore is elastically compressed and deformed while the seat is elastically deformed. When the moat is removed from the concrete molded body, a counterbore hole leading to the insert as it is embedded in the concrete is formed by opening tapered toward the surface of the concrete molded body.
It is characterized by that.

また、本発明は、コンクリートに埋め込まれたインサートの埋め込み位置で前記インサートに通じる座堀穴を前記コンクリートの表面に形成するための座堀具であって、
弾性材料により形成される第１の座堀形成具と鋼製の第２の座堀形成具とが組み合わされて成り、
前記第１の座堀形成具は、筒状を成すとともに、前記コンクリートが流し込まれる型枠に当接されるようになっている第１の端面と、その反端側の第２の端面と、前記第１の端面と前記第２の端面とを接続する外周側面とを有し、前記外周側面は、前記第２の端面から前記第１の端面へ向けて先細るテーパ形状を成し、
前記第２の座堀形成具は、前記第１の座堀形成具の内孔に嵌合する嵌合部を有して、前記外周側面により規定される前記第１の座堀形成具の外径の内側に収まるように前記第１の座堀形成具に組み付けられる、
ことを特徴とする。 Further, the present invention is a counterbore for forming a counterbore hole leading to the insert on the surface of the concrete at the embedding position of the insert embedded in the concrete.
It consists of a combination of a first counterbore forming tool formed of an elastic material and a second counterbore forming tool made of steel.
The first counterbore forming tool has a tubular shape and a first end surface that is brought into contact with the formwork into which the concrete is poured, and a second end surface on the opposite end side thereof. It has an outer peripheral side surface that connects the first end face and the second end face, and the outer peripheral side surface forms a tapered shape that tapers from the second end face toward the first end face.
The second counterbore forming tool has a fitting portion that fits into the inner hole of the first counterbore forming tool, and is outside the first counterbore forming tool defined by the outer peripheral side surface. Assembled to the first counterbore forming tool so as to fit inside the diameter.
It is characterized by that.

本発明のコンクリート躯体成形方法および座堀具によれば、それによりコンクリート躯体の表面に形成される座堀穴が、第１の座堀形成具の先細るテーパ形状の外周側面に起因して、コンクリート躯体（コンクリート成形体）の表面へ向けて先細るように開口して形成されるようになる。したがって、この先細りによって充填材脱落抑止勾配効果が得られ、座堀穴に埋め込まれる充填材が経年劣化や施工不良等に起因して座堀穴から脱落するような事態を防止できる。この場合、そのような先細りの座堀穴を形成する座堀具は、弾性材料により形成される第１の座堀形成具と鋼製の第２の座堀形成具とを組み合わせて成ることにより特徴的な利点を伴う。すなわち、第１の座堀形成具は、弾性材料により形成されるため、その外周側面がコンクリート表面へ向けて（第２の端面から第１の端面へ向けて）先細るテーパ形状に形成されていても、弾性変形によってコンクリートから取り外すことが可能であり、一方、このような弾性の第１の座堀形成具内に嵌合するように設けられる鋼製の第２の座堀形成具は、その嵌合部から座堀穴全体にわたって延在し得ることとなるため、弾性変形に起因して座堀穴の深さ寸法精度を確保することが難しい第１の座堀形成具とは異なり、その剛性によって座堀穴の深さを正確に規定することができる。 According to the concrete skeleton forming method and the counterbore of the present invention, the counterbore hole formed on the surface of the concrete skeleton is caused by the tapered outer peripheral side surface of the first counterbore forming tool. It is formed by opening so as to taper toward the surface of the concrete skeleton (concrete molded body). Therefore, this tapering provides a gradient effect for preventing the filler from falling off, and it is possible to prevent the filler embedded in the counterbore from falling out of the counterbore due to deterioration over time or poor construction. In this case, the counterbore forming such a tapered counterbore is formed by combining a first counterbore forming tool formed of an elastic material and a second counterbore forming tool made of steel. With characteristic advantages. That is, since the first counterbore forming tool is formed of an elastic material, its outer peripheral side surface is formed in a tapered shape that tapers toward the concrete surface (from the second end face to the first end face). However, it can be removed from the concrete by elastic deformation, while the steel second counterbore forming tool provided to fit into such an elastic first counterbore forming tool. Unlike the first counterbore forming tool, which is difficult to secure the depth dimensional accuracy of the counterbore due to elastic deformation because it can extend from the fitting portion to the entire counterbore. Its rigidity allows the depth of the counterbore to be accurately defined.

すなわち、本発明の座堀具は、弾性を有する第１の座堀形成具と鋼製の第２の座堀形成具とから成る複合的な構造により、互いの欠点（第１の座堀形成具だけでは、その弾性に起因して座堀穴の深さ寸法精度を確保することが難しく、一方、第２の座堀形成具だけでは、コンクリート表面へ向けて先細る形状にすると、その剛性に起因して座堀具をコンクリートから取り外すことができないという点）を補完しつつ、互いの利点（第１の座堀形成具は、コンクリート表面へ向けて先細るように形成してもその弾性変形によってコンクリートから取り外すことができ、一方、第２の座堀形成具はその剛性によって座堀穴の深さ寸法精度を確保できるという点）を引き出すため、コンクリートにその表面に向けて先細る座堀穴を座堀具によって容易に形成でき、座堀穴からの充填材の脱落の効果的な防止を図ることができる。 That is, the counterbore of the present invention has a mutual defect (first counterbore formation) due to the complex structure consisting of the first counterbore forming tool having elasticity and the second counterbore forming tool made of steel. It is difficult to secure the depth dimensional accuracy of the counterbore hole due to its elasticity with the tool alone, while the rigidity of the second counterbore forming tool alone is tapered toward the concrete surface. Complementing the fact that the counterbore cannot be removed from the concrete due to the above, the mutual advantage (the first counterbore former is elastic even if it is formed so as to taper toward the concrete surface). It can be removed from the concrete by deformation, while the second counterbore former can ensure the depth dimensional accuracy of the counterbore hole due to its rigidity), so that the seat is tapered toward the surface of the concrete. The pit can be easily formed by the counterbore, and the filler can be effectively prevented from falling off from the counterbore.

また、上記構成において、第２の座堀形成具は、第１の座堀形成具の第２の端面の側で内孔から突出する非嵌合部を更に有し、非嵌合部は、第１の座堀形成具の第２の端面から離れるにつれて先細る外周側面を有する柱状体として形成され、座堀具取り外しステップでは、第２の座堀形成具に取り付けた取り外し治具による座堀具の取り外し時に、第１の座堀形成具が弾性的に圧縮変形されつつ第２の座堀形成具の非嵌合部の先細る外周側面の案内によって座堀具がコンクリート成形体から取り外されることが好ましい。このように、第１の座堀形成具の第２の端面の側で突出する鋼製の第２の座堀形成具の非嵌合部の外周側面をコンクリート表面へ向けて広がる（第１の座堀形成具の第２の端面から離れるにつれて先細る）ように形成することにより、その外周側面の案内によって座堀具をコンクリート成形体から容易に取り外すことができる。 Further, in the above configuration, the second counterbore forming tool further has a non-fitting portion protruding from the inner hole on the side of the second end surface of the first counterbore forming tool, and the non-fitting portion is a non-fitting portion. It is formed as a columnar body having an outer peripheral side surface that tapers as it moves away from the second end face of the first counterbore forming tool, and in the sitting moat removing step, the sitting moat is performed by a removal jig attached to the second sitting moat forming tool. At the time of removal of the tool, the counterbore is removed from the concrete molded body by the guidance of the tapered outer peripheral side surface of the non-fitting portion of the second counterbore while being elastically compressed and deformed. Is preferable. In this way, the outer peripheral side surface of the non-fitting portion of the steel second counterbore forming tool protruding on the side of the second end surface of the first counterbore forming tool spreads toward the concrete surface (first). By forming the counterbore forming tool so as to taper away from the second end surface), the counterbore forming tool can be easily removed from the concrete molded body by the guidance of the outer peripheral side surface thereof.

また、上記構成において、第１の座堀形成具は、第１の端面の側の厚さ寸法が第２の端面の側の厚さ寸法よりも大きいことが好ましい。これによれば、座堀具取り外しステップにおいて取り外し治具を用いてコンクリート成形体から座堀具を取り外す際に、鋼製の第２の座堀形成具に取り付けられた取り外し治具による取り外し力を第１の座堀形成具の薄い第２の端面側から厚い第１の端面側へ向けて分散させて逃がすことが可能となり、コンクリート成形体からの座堀具の取り外しが容易となる。 Further, in the above configuration, it is preferable that the thickness dimension of the first counterbore forming tool on the side of the first end face is larger than the thickness dimension on the side of the second end face. According to this, when the counterbore is removed from the concrete molded body by using the removal jig in the counterbore removal step, the removal force by the removal jig attached to the second steel counterbore forming tool is applied. It is possible to disperse and release the first counterbore forming tool from the thin second end face side toward the thick first end face side, and it becomes easy to remove the counterbore from the concrete molded body.

また、上記構成において、締結固定ステップでは、インサートおよび第２の座堀形成具に締結される締結具によって第１の座堀形成具を軸方向に圧縮変形させることが好ましい。これによれば、第１の座堀形成具の圧縮変形によって、第１の座堀形成具と第２の座堀形成具とが圧接するとともに、型枠と第１の座堀形成具とが圧接するようになるため、セメントと水との混合物であるノロ（セメントペースト）が第１の座堀形成具と第２の座堀形成具との間の隙間および型枠と第１の座堀形成具との間の隙間を通って流れることを防止でき、したがって、それに伴って生じるノロの薄膜（バリ）の形成を回避して、コンクリート躯体の良好な仕上がり状態を確保できる。 Further, in the above configuration, in the fastening fixing step, it is preferable to compress and deform the first counterbore forming tool in the axial direction by the fastener fastened to the insert and the second counterbore forming tool. According to this, due to the compressive deformation of the first counterbore forming tool, the first sitting moat forming tool and the second sitting moat forming tool are in pressure contact with each other, and the formwork and the first sitting moat forming tool are brought into contact with each other. Noro (cement paste), which is a mixture of cement and water, is pressed into contact with each other, so that the gap between the first counterbore forming tool and the second counterbore forming tool and the formwork and the first counterbore are formed. It is possible to prevent the concrete from flowing through the gap between the formwork and the formwork, and therefore, it is possible to avoid the formation of the thin film (burr) of Noro that accompanies it, and to ensure a good finished state of the concrete skeleton.

また、締結固定ステップにおいて締結具により第１の座堀形成具を軸方向に圧縮変形させる場合には、脱型ステップにおいて、圧縮変形された第１の座堀形成具の弾性復元力を利用してコンクリート成形体を型枠から脱型させることが好ましい。このようにすれば、コンクリート成形体から型枠を外す瞬間に、圧縮された第１の座堀形成具が弾性的に復元し、その反発力によりコンクリート成形体と型枠との離脱をスムーズに行なうことができる。 Further, when the first counterbore forming tool is compression-deformed in the axial direction by the fastener in the fastening fixing step, the elastic restoring force of the compression-deformed first counterbore forming tool is used in the demolding step. It is preferable to remove the concrete molded body from the formwork. By doing so, the compressed first counterbore forming tool is elastically restored at the moment when the formwork is removed from the concrete molded body, and the repulsive force of the elastically restores the concrete molded body and the formwork smoothly. Can be done.

また、上記構成において、第２の端面から第１の端面へ向けて先細るテーパ形状の第１の座堀形成具の外周側面は、第１の端面の側の端縁部が、第１の端面へ向かって径方向外側に広がる傾斜面として形成されることが好ましい。これによれば、蟻足状の勾配（「く」の字に屈曲する形状）を外周面にもたらすことができ、それにより、コンクリート成形体から座堀具を取り外す際の抵抗を効果的に逃がして、座堀具取り外しに伴う座堀穴の形状崩れを防止でき、コンクリート躯体の良好な仕上がり状態を確保できる。 Further, in the above configuration, the outer peripheral side surface of the first counterbore forming tool having a tapered shape tapering from the second end face to the first end face has a first edge portion on the side of the first end face. It is preferably formed as an inclined surface extending radially outward toward the end surface. According to this, an dovetail-like gradient (a shape that bends in a "dogleg" shape) can be provided on the outer peripheral surface, thereby effectively relieving resistance when removing the counterbore from the concrete molded body. Therefore, it is possible to prevent the shape of the counterbore hole from being deformed due to the removal of the counterbore, and it is possible to secure a good finished state of the concrete skeleton.

また、上記構成では、第１の座堀形成具と第２の座堀形成具とが着脱可能に固定されていることが好ましい。これによれば、第１の座堀形成具と第２の座堀形成具との嵌合状態を固定でき、取り外し治具を用いて第１の座堀形成具と第２の座堀形成具とを確実に一体化させて同時に取り外すことができる。 Further, in the above configuration, it is preferable that the first counterbore forming tool and the second counterbore forming tool are detachably fixed. According to this, the fitted state of the first counterbore forming tool and the second counterbore forming tool can be fixed, and the first sitting moat forming tool and the second sitting moat forming tool can be fixed by using the removal jig. And can be securely integrated and removed at the same time.

また、上記構成において、第１の座堀形成具および第２の座堀形成具は、取り外し治具を用いて第１の座堀形成具と第２の座堀形成具とが一体的にコンクリート成形体から取り外されるように互いに係止されていてもよい。この場合も、先とほぼ同様に、第１の座堀形成具と第２の座堀形成具との嵌合状態を安定させることができ、取り外し治具を用いて第１の座堀形成具と第２の座堀形成具とを一体化させて同時に取り外すことが可能となる。 Further, in the above configuration, in the first counterbore forming tool and the second counterbore forming tool, the first sitting moat forming tool and the second sitting moat forming tool are integrally made of concrete by using a removal jig. They may be locked together so that they can be removed from the molded body. In this case as well, the fitting state of the first counterbore forming tool and the second counterbore forming tool can be stabilized in almost the same manner as before, and the first counterbore forming tool can be used by using the removal jig. And the second counterbore forming tool can be integrated and removed at the same time.

なお、コンクリート成形体からの座堀具の取り外しに関しては、第１の座堀形成具および第２の座堀形成具を同時に引き抜くことができるようにする専用の取り外し治具を用いるとよい。そのような専用の取り外し治具は、座堀穴で露出する第２の座堀形成具に設けたネジ穴に螺合されてもよい。 Regarding the removal of the counterbore from the concrete molded body, it is preferable to use a dedicated removal jig that allows the first counterbore forming tool and the second counterbore forming tool to be pulled out at the same time. Such a dedicated removal jig may be screwed into a screw hole provided in the second counterbore forming tool exposed in the counterbore hole.

また、上記構成において、第１の座堀形成具の内孔を形成する内周面は第２の端面から第１の端面へ向けて先細るテーパ形状を成し、第１の座堀形成具の内孔に嵌合する第２の座堀形成具の嵌合部の外周側面は、第１の座堀形成具の内周面の先細り形状に対応する先細り形状を成すことが好ましい。これによれば、第１の座堀形成具と第２の座堀形成具とがテーパ嵌合する結果となるため、第１の座堀形成具と第２の座堀形成具との嵌合密着性が向上するとともに、テーパ嵌合面が第１および第２の座堀形成具同士の芯合わせのガイドとしての機能を果たすようになる。 Further, in the above configuration, the inner peripheral surface forming the inner hole of the first counterbore forming tool has a tapered shape that tapers from the second end face to the first end face, and the first counterbore forming tool. It is preferable that the outer peripheral side surface of the fitting portion of the second counterbore forming tool to be fitted into the inner hole of the first counterbore forming tool has a tapered shape corresponding to the tapered shape of the inner peripheral surface of the first counterbore forming tool. According to this, the first counterbore forming tool and the second counterbore forming tool are tapered and fitted, so that the first sitting moat forming tool and the second sitting moat forming tool are fitted together. The adhesion is improved, and the tapered fitting surface functions as a guide for aligning the first and second counterbore forming tools with each other.

本発明のコンクリート躯体成形方法および座堀具によれば、それによりコンクリート躯体の表面に形成される座堀穴が、コンクリート躯体（コンクリート成形体）の表面へ向けて先細るように開口して形成されるようになる。したがって、この先細りによって充填材脱落抑止勾配効果が得られ、座堀穴に埋め込まれる充填材が経年劣化や施工不良等に起因して座堀穴から脱落するような事態を防止できる。 According to the concrete skeleton forming method and the counterbore of the present invention, the counterbore hole formed on the surface of the concrete skeleton is formed by opening so as to taper toward the surface of the concrete skeleton (concrete molded body). Will be done. Therefore, this tapering provides a gradient effect for preventing the filler from falling off, and it is possible to prevent the filler embedded in the counterbore from falling out of the counterbore due to deterioration over time or poor construction.

本発明の第１の実施の形態に係る座堀具と共にインサートを型枠に組み付けた状態を示す断面図である。It is sectional drawing which shows the state which attached the insert to the formwork together with the counterbore which concerns on 1st Embodiment of this invention. 型枠から取り外されたコンクリート成形体の断面図である。It is sectional drawing of the concrete molded body removed from a formwork. 図１の組み付け態様によって形成される座堀穴を表面に有するコンクリート躯体の部分断面図である。FIG. 3 is a partial cross-sectional view of a concrete skeleton having a counterbore hole formed by the assembly mode of FIG. 1 on the surface. 本発明の一実施の形態に係るコンクリート躯体の成形方法の一例を示すフローチャートである。It is a flowchart which shows an example of the molding method of the concrete skeleton which concerns on one Embodiment of this invention. 本発明の第２の実施の形態に係る座堀具と共にインサートを型枠に組み付けた状態を示す断面図である。It is sectional drawing which shows the state which attached the insert to the formwork together with the counterbore which concerns on 2nd Embodiment of this invention. 本発明の第３の実施の形態に係る座堀具と共にインサートを型枠に組み付けた状態を示す断面図である。It is sectional drawing which shows the state which attached the insert to the formwork together with the counterbore which concerns on 3rd Embodiment of this invention. 本発明の第４の実施の形態に係る座堀具と共にインサートを型枠に組み付けた状態を示す断面図である。It is sectional drawing which shows the state which attached the insert to the formwork together with the counterbore which concerns on 4th Embodiment of this invention. 本発明の第５の実施の形態に係る座堀具と共にインサートを型枠に組み付けた状態を示す断面図である。It is sectional drawing which shows the state which attached the insert to the formwork together with the counterbore which concerns on 5th Embodiment of this invention.

以下、図面を参照して本発明の実施の形態について説明する。
図１は、本発明の第１の実施の形態に係る座堀具１０と共にインサート８０を型枠９０に組み付けた状態を断面図で示している。この場合、座堀具１０およびインサート８０は、例えば座堀具１０およびインサート８０の内孔に形成される雌ネジに螺合される雄ネジを有する図示しない締結具を用いて型枠９０に締結固定される。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a state in which the insert 80 is assembled to the mold 90 together with the counterbore 10 according to the first embodiment of the present invention. In this case, the counterbore 10 and the insert 80 are fastened to the mold 90 using, for example, a fastener (not shown) having a male screw screwed into a female screw formed in the inner hole of the counterbore 10 and the insert 80. It is fixed.

本実施の形態に係る座堀具１０は、図３に示されるように、コンクリートＣに埋め込まれたインサート８０の埋め込み位置でインサート８０に通じる座堀穴５０をコンクリートＣ（コンクリート躯体６０）の表面６０ａに形成するためのものであり、図１に示されるように、弾性材料により形成される第１の座堀形成具２０と、鋼製の第２の座堀形成具３０とが組み合わされて成る。 As shown in FIG. 3, the counterbore 10 according to the present embodiment has a counterbore hole 50 leading to the insert 80 at the embedding position of the insert 80 embedded in the concrete C on the surface of the concrete C (concrete skeleton 60). It is for forming in 60a, and as shown in FIG. 1, a first counterbore forming tool 20 formed of an elastic material and a second counterbore forming tool 30 made of steel are combined. Become.

弾性材料により形成される第１の座堀形成具２０は、筒状を成しており、型枠９０（型枠９０に流し込まれるコンクリートと接触する型枠９０の内面９０ａ）に当接される第１の端面２０ａと、その反端側の第２の端面２０ｂと、第１の端面２０ａと第２の端面２０ｂとを接続する外周側面２０ｃとを有する。この場合、外周側面２０ｃは、第２の端面２０ｂから第１の端面２０ａへ向けて先細るテーパ形状を成しており、座堀具１０の中心軸線Ｏに沿う断面において直線状に延びる。 The first counterbore forming tool 20 formed of the elastic material has a cylindrical shape and is in contact with the formwork 90 (the inner surface 90a of the formwork 90 in contact with the concrete poured into the formwork 90). It has a first end surface 20a, a second end surface 20b on the opposite end side thereof, and an outer peripheral side surface 20c connecting the first end surface 20a and the second end surface 20b. In this case, the outer peripheral side surface 20c has a tapered shape that tapers from the second end surface 20b toward the first end surface 20a, and extends linearly in a cross section along the central axis O of the counterbore 10.

第２の座堀形成具３０は、第１の座堀形成具２０の内孔２０ｄに嵌合する嵌合部３０Ａを有しており、第１の座堀形成具２０の外周側面２０ｃにより規定される第１の座堀形成具２０の外径（最大外径または外周側面２０ｃ）の内側に収まるように第１の座堀形成具２０に組み付けられる。また、本実施の形態において、第２の座堀形成具３０は、第１の座堀形成具２０の第２の端面２０ｂの側で内孔２０ｄから突出する非嵌合部３０Ｂも有し、この非嵌合部３０Ｂは、第１の座堀形成具２０の第２の端面２０ｂから離れるにつれて先細る外周側面３０Ｂｂを有する柱状体として形成される。この場合、非嵌合部３０Ｂは、嵌合部３０Ａと一体形成されており、第１の座堀形成具２０の第２の端面２０ｂと当接する第２の座堀形成具３０の段部３０ａを形成するように径方向外側に張り出すべく延在する第１の端面３０Ｂｃと、その反対側の第２の端面３０Ｂｄとを有し、これらの端面３０Ｂｃ，３０Ｂｄ同士が、第１の端面３０Ｂｃから第２の端面３０Ｂｄへ向けて先細るテーパ形状の外周側面３０Ｂｂによって接続される。しかしながら、第２の座堀形成具３０は、このような非嵌合部３０Ｂを有していなくてもよい。 The second counterbore forming tool 30 has a fitting portion 30A that fits into the inner hole 20d of the first counterbore forming tool 20, and is defined by the outer peripheral side surface 20c of the first counterbore forming tool 20. It is assembled to the first counterbore forming tool 20 so as to fit inside the outer diameter (maximum outer diameter or outer peripheral side surface 20c) of the first counterbore forming tool 20. Further, in the present embodiment, the second counterbore forming tool 30 also has a non-fitting portion 30B protruding from the inner hole 20d on the side of the second end surface 20b of the first counterbore forming tool 20. The non-fitting portion 30B is formed as a columnar body having an outer peripheral side surface 30Bb that tapers toward the second end surface 20b of the first counterbore forming tool 20. In this case, the non-fitting portion 30B is integrally formed with the fitting portion 30A, and the step portion 30a of the second counterbore forming tool 30 that abuts on the second end surface 20b of the first counterbore forming tool 20. It has a first end face 30Bc extending radially outward so as to form a surface, and a second end face 30Bd on the opposite side thereof, and these end faces 30Bc and 30Bd are connected to each other with the first end face 30Bc. It is connected by an outer peripheral side surface 30Bb having a tapered shape that tapers from the second end surface 30Bd. However, the second counterbore forming tool 30 does not have to have such a non-fitting portion 30B.

嵌合部３０Ａを介して第１の座堀形成具２０に着脱自在に組み付けられ（固定され）るこのような第２の座堀形成具３０は、その高い剛性により、座堀穴５０の深さＤ（図３参照）を規定するようになっている。 Such a second counterbore forming tool 30 that is detachably assembled (fixed) to the first counterbore forming tool 20 via the fitting portion 30A has a depth of the counterbore hole 50 due to its high rigidity. D (see FIG. 3) is specified.

また、本実施の形態において、第１の座堀形成具２０の内孔２０ｄを形成する内周面は第２の端面２０ｂから第１の端面２０ａへ向けて先細るテーパ形状を成しており、また、それに伴って、第１の座堀形成具２０の内孔２０ｄに嵌合する第２の座堀形成具３０の嵌合部３０Ａの外周側面３０Ａｂも、第１の座堀形成具２０の内周面の先細り形状に対応する先細り形状（座堀具１０の中心軸線Ｏに沿う断面において直線状に延びる）を成している。そのため、本実施の形態において、第１の座堀形成具２０は、第１の端面２０ａの側の厚さ寸法Ｔ１が第２の端面２０ｂの側の厚さ寸法Ｔ２よりも大きくなっている。 Further, in the present embodiment, the inner peripheral surface forming the inner hole 20d of the first counterbore forming tool 20 has a tapered shape that tapers from the second end surface 20b toward the first end surface 20a. Along with this, the outer peripheral side surface 30Ab of the fitting portion 30A of the second counterbore forming tool 30 that fits into the inner hole 20d of the first counterbore forming tool 20 is also the first counterbore forming tool 20. It has a tapered shape (extending linearly in a cross section along the central axis O of the counterbore 10) corresponding to the tapered shape of the inner peripheral surface of the counterbore. Therefore, in the present embodiment, in the first counterbore forming tool 20, the thickness dimension T1 on the side of the first end face 20a is larger than the thickness dimension T2 on the side of the second end face 20b.

続いて、上記構成の座堀具１０を用いて、コンクリートＣにインサート８０を埋め込みつつその埋め込み位置でインサート８０に通じる座堀穴５０をコンクリート表面に形成するコンクリート躯体６０（図３参照）の成形方法の一例について説明する。 Subsequently, using the counterbore 10 having the above configuration, the concrete skeleton 60 (see FIG. 3) is formed by embedding the insert 80 in the concrete C and forming a counterbore hole 50 leading to the insert 80 at the embedding position on the concrete surface. An example of the method will be described.

まず、初めに、弾性材料により形成される第１の座堀形成具２０と鋼製の第２の座堀形成具３０とを組み合わせて成る座堀具１０をインサート８０と共に図示しない締結具を用いて型枠９０に締結固定する（図４の締結固定ステップＳ１）。この場合、第１の座堀形成具２０の内孔２０ｄに第２の座堀形成具３０の嵌合部３０Ａが嵌合されるとともに、第１の座堀形成具２０の第１の端面２０ａが型枠９０の内面９０ａに当接された状態で、前記締結具が、型枠９０の締結具挿通孔９０ｂを通じて、第２の座堀形成具３０の嵌合部３０Ａの段付き穴３０Ａａ，３０Ａｂ（本実施の形態では、例えば穴３０Ａａがネジ穴）、非嵌合部３０Ｂのネジ穴３０Ｂａ、および、インサート８０のネジ穴８０ａに螺合されて、前記締結具の頭部が型枠９０の外面９０ｃに当て付けられるように前記締結具が締め付けられることにより、座堀具１０がインサート８０と組み付けられて型枠９０に締結固定される。 First, a counterbore 10 formed by combining a first counterbore forming tool 20 formed of an elastic material and a second counterbore forming tool 30 made of steel is used together with an insert 80 by using a fastener (not shown). Fasten and fix to the mold 90 (fastening and fixing step S1 in FIG. 4). In this case, the fitting portion 30A of the second counterbore forming tool 30 is fitted into the inner hole 20d of the first counterbore forming tool 20, and the first end surface 20a of the first counterbore forming tool 20 is fitted. With the fastener abutting on the inner surface 90a of the formwork 90, the fastener is passed through the fastener insertion hole 90b of the formwork 90, and the stepped hole 30Aa of the fitting portion 30A of the second counterbore forming tool 30. 30Ab (for example, in the present embodiment, the hole 30Aa is a screw hole), the screw hole 30Ba of the non-fitting portion 30B, and the screw hole 80a of the insert 80 are screwed into the formwork 90. By tightening the fastener so as to be attached to the outer surface 90c of the above, the counterbore 10 is assembled with the insert 80 and fastened and fixed to the form 90.

なお、この締結固定ステップＳ１では、前記締結具による締め付けによって弾性材料から成る第１の座堀形成具２０が軸方向（中心軸線Ｏの方向）に圧縮変形される（図１の左側の半断面には、そのような圧縮変形時の第１の座堀形成具２０の圧縮量Ｘが示される）。 In the fastening and fixing step S1, the first counterbore forming tool 20 made of an elastic material is compressed and deformed in the axial direction (direction of the central axis O) by tightening with the fastener (half cross section on the left side of FIG. 1). Shows the compression amount X of the first counterbore forming tool 20 at the time of such compression deformation).

このようにして座堀具１０がインサート８０と組み付けられて型枠９０に締結固定されたら、今度は、型枠９０に（型枠９０の内面９０ａ側で）コンクリートＣを流し込む（図４のコンクリート打設ステップＳ２）。そして、コンクリートＣの硬化後に、前記締結具による締結状態を解除することにより、座堀具１０を伴ってインサート８０が埋め込まれて成るコンクリート成形体４０（図２参照）を型枠９０から取り外す（図４の脱型ステップＳ３）。この脱型ステップＳ３では、圧縮変形された第１の座堀形成具２０の弾性復元力を利用してコンクリート成形体４０が型枠９０から脱型される。 After the counterbore 10 is assembled with the insert 80 and fastened and fixed to the formwork 90 in this way, concrete C is poured into the formwork 90 (on the inner surface 90a side of the formwork 90) (concrete in FIG. 4). Casting step S2). Then, after the concrete C is hardened, the concrete molded body 40 (see FIG. 2) in which the insert 80 is embedded together with the counterbore 10 is removed from the formwork 90 by releasing the fastening state by the fastener (see FIG. 2). Demolding step S3) in FIG. In this demolding step S3, the concrete molded body 40 is demolded from the formwork 90 by utilizing the elastic restoring force of the first counterbore forming tool 20 that has been compressed and deformed.

コンクリート成形体４０を型枠９０から外したら、続いて、コンクリート成形体４０から図示しない取り外し治具を用いて座堀具１０を取り外す（図４の座堀具取り外しステップＳ４）。この場合、前記取り外し治具は、例えば、第２の座堀形成具３０の嵌合部３０Ａの段付き穴３０Ａａ，３０Ａｂおよび非嵌合部３０Ｂのネジ穴３０Ｂａに螺合され、コンクリート成形体４０から座堀具１０を引き抜く。また、このような取り外し治具による座堀具１０の取り外し時においては、第１の座堀形成具２０が弾性的に圧縮変形されつつ座堀具１０がコンクリート成形体４０から取り外される。特に、第２の座堀形成具３０が非嵌合部３０Ｂを有する本実施の形態では、前記取り外し治具による座堀具１０の取り外し時、第１の座堀形成具２０が弾性的に圧縮変形されつつ非嵌合部３０Ｂの先細る外周側面３０Ｂｂの案内によって座堀具１０がコンクリート成形体４０から取り外され、それにより、図３に示されるように、コンクリートＣに埋め込まれたままのインサート８０に通じる座堀穴５０がコンクリート成形体４０の表面へ向けて先細るように開口して形成されるコンクリート躯体６０が完成する。 After removing the concrete molded body 40 from the formwork 90, the counterbore 10 is subsequently removed from the concrete molded body 40 using a removal jig (not shown) (seat moat removal step S4 in FIG. 4). In this case, the removal jig is screwed into, for example, the stepped holes 30Aa and 30Ab of the fitting portion 30A of the second counterbore forming tool 30 and the screw holes 30Ba of the non-fitting portion 30B, and the concrete molded body 40. Pull out the seating tool 10 from. Further, when the counterbore 10 is removed by such a removal jig, the counterbore 10 is removed from the concrete molded body 40 while the first counterbore forming tool 20 is elastically compressed and deformed. In particular, in the present embodiment in which the second counterbore forming tool 30 has the non-fitting portion 30B, the first counterbore forming tool 20 is elastically compressed when the counterbore 10 is removed by the removal jig. The counterbore 10 is removed from the concrete molded body 40 by the guidance of the tapered outer peripheral side surface 30Bb of the non-fitting portion 30B while being deformed, whereby the insert remains embedded in the concrete C as shown in FIG. A concrete skeleton 60 formed by opening a counterbore hole 50 leading to 80 so as to taper toward the surface of the concrete molded body 40 is completed.

この場合、座堀穴５０は、コンクリート躯体６０の表面６０ａへ向けて先細るように第１の座堀形成具２０の外周側面２０ｃによって形成されるテーパ面５０ａと、第２の座堀形成具３０の段部３０ａによって形成される段部５０ｂと、コンクリート躯体６０の表面６０ａへ向けて広がるように第２の座堀形成具３０の非嵌合部３０Ｂの外周側面３０Ｂｂによって形成される逆テーパ面５０ｃとを有し、また、座堀穴５０の開口の直径寸法（すなわち、第１の座堀形成具２０の第１の端面２０ａの外径寸法）は、第２の座堀形成具３０が非嵌合部３０Ｂの外周側面３０Ｂｂの最大外径（すなわち、非嵌合部３０Ｂの第１の端面３０Ｂｃの外径寸法）よりも大きくなっている。このようなコンクリート躯体６０には、これに埋め込まれたインサート８０のネジ穴８０ａに締結されるボルト等の図示しない取り付け金具を介して様々な部材や設備等を付設させることができる In this case, the counterbore hole 50 has a tapered surface 50a formed by the outer peripheral side surface 20c of the first counterbore forming tool 20 so as to taper toward the surface 60a of the concrete frame 60, and a second counterbore forming tool. Reverse taper formed by the stepped portion 50b formed by the stepped portion 30a of 30 and the outer peripheral side surface 30Bb of the non-fitting portion 30B of the second counterbore forming tool 30 so as to spread toward the surface 60a of the concrete skeleton 60. It has a surface 50c, and the diameter dimension of the opening of the counterbore hole 50 (that is, the outer diameter dimension of the first end surface 20a of the first counterbore forming tool 20) is the second counterbore forming tool 30. Is larger than the maximum outer diameter of the outer peripheral side surface 30Bb of the non-fitting portion 30B (that is, the outer diameter dimension of the first end surface 30Bc of the non-fitting portion 30B). Various members, equipment, and the like can be attached to such a concrete skeleton 60 via mounting brackets (not shown) such as bolts fastened to the screw holes 80a of the insert 80 embedded therein.

以上説明したように、本実施の形態によれば、座堀具１０によりコンクリート躯体６０（コンクリート成形体４０）の表面に形成される座堀穴５０が、第１の座堀形成具２０の先細るテーパ形状の外周側面２０ｃに起因して、コンクリート躯体６０（コンクリート成形体４０）の表面へ向けて先細るように開口して形成されるようになる。したがって、この先細りによって充填材脱落抑止勾配効果が得られ、そのため、インサート８０に前記取り付け金具を締結した後にコンクリート躯体６０の表面６０ａを平滑に仕上げるべく座堀穴５０に埋め込まれるモルタル等の充填材が経年劣化や施工不良等に起因して座堀穴５０から脱落するような事態を防止できる。この場合、そのような先細りの座堀穴５０を形成する座堀具１０は、弾性材料により形成される第１の座堀形成具２０と鋼製の第２の座堀形成具３０とを組み合わせて成ることにより特徴的な利点を伴う。すなわち、第１の座堀形成具２０は、弾性材料により形成されるため、その外周側面２０ｃがコンクリート表面へ向けて（第２の端面２０ｂから第１の端面２０ａへ向けて）先細るテーパ形状に形成されていても、弾性変形によってコンクリートＣから取り外すことが可能であり、一方、このような弾性の第１の座堀形成具２０内に嵌合するように設けられる鋼製の第２の座堀形成具３０は、その嵌合部３０Ａから非嵌合部３０Ｂに至るまで座堀穴５０全体にわたって延在することとなるため、弾性変形に起因して座堀穴５０の深さ寸法精度を確保することが難しい第１の座堀形成具２０とは異なり、その剛性によって座堀穴５０の深さＤを正確に規定することができる。 As described above, according to the present embodiment, the counterbore hole 50 formed on the surface of the concrete skeleton 60 (concrete molded body 40) by the counterbore 10 is tapered of the first counterbore forming tool 20. Due to the tapered outer peripheral side surface 20c, the concrete skeleton 60 (concrete molded body 40) is formed by opening so as to taper toward the surface. Therefore, this tapering provides a gradient effect for preventing the filler from falling off, and therefore, after fastening the mounting bracket to the insert 80, the filler such as mortar to be embedded in the counterbore hole 50 in order to finish the surface 60a of the concrete skeleton 60 smoothly. However, it is possible to prevent the situation where the concrete is dropped from the counterbore hole 50 due to deterioration over time or poor construction. In this case, the counterbore 10 forming such a tapered counterbore hole 50 is a combination of the first counterbore forming tool 20 formed of an elastic material and the second counterbore forming tool 30 made of steel. It has a characteristic advantage. That is, since the first counterbore forming tool 20 is formed of an elastic material, its outer peripheral side surface 20c has a tapered shape that tapers toward the concrete surface (from the second end surface 20b toward the first end surface 20a). Even if it is formed in, it can be removed from the concrete C by elastic deformation, while a second steel made of steel provided so as to be fitted in the first elastic first counterbore forming tool 20. Since the counterbore forming tool 30 extends over the entire counterbore hole 50 from the fitting portion 30A to the non-fitting portion 30B, the depth dimensional accuracy of the counterbore hole 50 is due to elastic deformation. Unlike the first counterbore forming tool 20, which is difficult to secure, the depth D of the counterbore hole 50 can be accurately defined by its rigidity.

すなわち、本実施の形態の座堀具１０は、弾性を有する第１の座堀形成具２０と鋼製の第２の座堀形成具３０とから成る複合的な構造により、互いの欠点（第１の座堀形成具２０だけでは、その弾性に起因して座堀穴５０の深さ寸法精度を確保することが難しく、一方、第２の座堀形成具３０だけでは、コンクリート表面へ向けて先細る形状にすると、その剛性に起因して座堀具１０をコンクリートＣから取り外すことができないという点）を補完しつつ、互いの利点（第１の座堀形成具２０は、コンクリート表面へ向けて先細るように形成してもその弾性変形によってコンクリートＣから取り外すことができ、一方、第２の座堀形成具３０はその剛性によって座堀穴５０の深さ寸法精度を確保できるという点）を引き出すため、コンクリートＣにその表面に向けて先細る座堀穴５０を座堀具１０によって容易に形成でき、座堀穴５０からの充填材の脱落の効果的な防止を図ることができる。 That is, the counterbore 10 of the present embodiment has a mutual defect (first) due to the complex structure including the first counterbore forming tool 20 having elasticity and the second counterbore forming tool 30 made of steel. It is difficult to secure the depth dimensional accuracy of the counterbore hole 50 due to its elasticity with only the counterbore forming tool 20 of 1, while the second counterbore forming tool 30 alone is directed toward the concrete surface. When the shape is tapered, the counterbore 10 cannot be removed from the concrete C due to its rigidity, while complementing each other's advantages (the first counterbore 20 is directed toward the concrete surface). Even if it is formed so as to be tapered, it can be removed from the concrete C due to its elastic deformation, while the second counterbore forming tool 30 can secure the depth dimensional accuracy of the counterbore hole 50 due to its rigidity). In order to draw out the concrete C, a counterbore hole 50 that tapers toward the surface thereof can be easily formed by the counterbore tool 10, and the filler can be effectively prevented from falling off from the counterbore hole 50.

また、本実施の形態において、第１の座堀形成具２０は、第１の端面２０ａの側の厚さ寸法Ｔ１が第２の端面２０ｂの側の厚さ寸法Ｔ２よりも大きいため、座堀具取り外しステップＳ４において取り外し治具を用いてコンクリート成形体４０から座堀具１０を取り外す際に、鋼製の第２の座堀形成具３０に取り付けられた取り外し治具による取り外し力を第１の座堀形成具２０の薄い第２の端面２０ｂ側から厚い第１の端面２０ａ側へ向けて分散させて逃がすことが可能となり、コンクリート成形体４０からの座堀具１０の取り外しが容易となる。 Further, in the present embodiment, in the first counterbore forming tool 20, the thickness dimension T1 on the side of the first end face 20a is larger than the thickness dimension T2 on the side of the second end face 20b, so that the counterbore is formed. When the counterbore 10 is removed from the concrete molded body 40 by using the removal jig in the tool removal step S4, the removal force by the removal jig attached to the steel second counterbore forming tool 30 is used as the first. It is possible to disperse and escape from the thin second end surface 20b side of the counterbore forming tool 20 toward the thick first end surface 20a side, and it becomes easy to remove the counterbore 10 from the concrete molded body 40.

また、本実施の形態において、締結固定ステップＳ１では、インサート８０および第２の座堀形成具３０に締結される締結具によって第１の座堀形成具２０を軸方向に圧縮変形させるようにしているため、この圧縮変形によって、第１の座堀形成具２０と第２の座堀形成具３０とが圧接するとともに、型枠９０と第１の座堀形成具２０とが圧接するようになり、したがって、セメントと水との混合物であるノロ（セメントペースト）が第１の座堀形成具２０と第２の座堀形成具３０との間の隙間および型枠９０と第１の座堀形成具２０との間の隙間を通って流れることを防止でき、それに伴って生じるノロの薄膜（バリ）の形成を回避して、コンクリート躯体６０の良好な仕上がり状態を確保できる。 Further, in the present embodiment, in the fastening fixing step S1, the first counterbore forming tool 20 is compressed and deformed in the axial direction by the fasteners fastened to the insert 80 and the second counterbore forming tool 30. Therefore, due to this compression deformation, the first counterbore forming tool 20 and the second counterbore forming tool 30 are in pressure contact with each other, and the formwork 90 and the first counterbore forming tool 20 are in pressure contact with each other. Therefore, the glue (cement paste), which is a mixture of cement and water, forms a gap between the first counterbore forming tool 20 and the second counterbore forming tool 30 and the formwork 90 and the first counterbore forming tool 30. It is possible to prevent the concrete skeleton 60 from flowing through the gap between the tool 20 and the concrete skeleton 60 by avoiding the formation of a thin film (burr) of the glue that accompanies the flow.

また、本実施の形態では、脱型ステップＳ３において、圧縮変形された第１の座堀形成具２０の弾性復元力を利用してコンクリート成形体４０を型枠９０から脱型させるようにしているため、コンクリート成形体４０から型枠９０を外す瞬間に、圧縮された第１の座堀形成具２０が弾性的に復元し、その反発力によりコンクリート成形体４０と型枠９０との離脱をスムーズに行なうことができる。 Further, in the present embodiment, in the demolding step S3, the concrete molded body 40 is demolded from the formwork 90 by utilizing the elastic restoring force of the compression-deformed first counterbore forming tool 20. Therefore, at the moment when the formwork 90 is removed from the concrete molded body 40, the compressed first counterbore forming tool 20 is elastically restored, and the repulsive force of the elastically restores the concrete molded body 40 and the formwork 90 smoothly. Can be done.

また、本実施の形態において、第１の座堀形成具２０の内孔２０ｄを形成する内周面は第２の端面２０ｂから第１の端面２０ａへ向けて先細るテーパ形状を成し、また、第１の座堀形成具２０の内孔２０ｄに嵌合する第２の座堀形成具３０の嵌合部３０Ａの外周側面３０Ａｂは、第１の座堀形成具２０の内周面（内孔２０ｄ）の先細り形状に対応する先細り形状を成しているため、第１の座堀形成具２０と第２の座堀形成具３０とがテーパ嵌合する結果となり、したがって、第１の座堀形成具２０と第２の座堀形成具３０との嵌合密着性が向上するとともに、テーパ嵌合面が第１および第２の座堀形成具２０，３０同士の芯合わせのガイドとしての機能を果たすようになる。 Further, in the present embodiment, the inner peripheral surface forming the inner hole 20d of the first counterbore forming tool 20 has a tapered shape that tapers from the second end surface 20b toward the first end surface 20a. The outer peripheral side surface 30Ab of the fitting portion 30A of the second counterbore forming tool 30 that fits into the inner hole 20d of the first counterbore forming tool 20 is the inner peripheral surface (inside) of the first counterbore forming tool 20. Since the tapered shape corresponding to the tapered shape of the hole 20d) is formed, the first counterbore forming tool 20 and the second counterbore forming tool 30 are tapered and fitted, and therefore, the first seat is tapered. The fitting adhesion between the moat forming tool 20 and the second counterbore forming tool 30 is improved, and the tapered fitting surface serves as a guide for aligning the first and second counterbore forming tools 20, 30 with each other. It will perform its function.

図５は、本発明の第２の実施の形態に係る座堀具１０Ａと共にインサート８０を型枠９０に組み付けた状態を示す断面図である。図示のように、本実施の形態において、第２の端面２０ｂから第１の端面２０ａへ向けて先細るテーパ形状の第１の座堀形成具２０の外周側面２０ｃは、第１の端面２０ａの側の端縁部が、第１の端面２０ａへ向かって径方向外側に広がる傾斜面２０ｅとして形成されている。言い換えると、本実施の形態の第１の座堀形成具２０の外周面は、第２の端面２０ｂから第１の端面２０ａへ向けて先細るテーパ形状の部位２０ｃと、第１の端面２０ａへ向かって径方向外側に広がる部位２０ｅとを有する。これによれば、蟻足状の勾配（「く」の字に屈曲する形状）を第１の座堀形成具２０の外周面にもたらすことができ、それにより、コンクリート成形体４０から座堀具１０Ａを取り外す際の抵抗を効果的に逃がして、座堀具取り外しに伴う座堀穴５０の形状崩れを防止でき、コンクリート躯体６０の良好な仕上がり状態を確保できる。 FIG. 5 is a cross-sectional view showing a state in which the insert 80 is assembled to the mold 90 together with the counterbore 10A according to the second embodiment of the present invention. As shown in the figure, in the present embodiment, the outer peripheral side surface 20c of the first counterbore forming tool 20 having a tapered shape that tapers from the second end surface 20b toward the first end surface 20a is the first end surface 20a. The side edge portion is formed as an inclined surface 20e extending radially outward toward the first end surface 20a. In other words, the outer peripheral surface of the first counterbore forming tool 20 of the present embodiment has a tapered portion 20c that tapers from the second end surface 20b toward the first end surface 20a and the first end surface 20a. It has a portion 20e that extends radially outward. According to this, an dovetail-shaped gradient (a shape that bends in a dogleg shape) can be provided on the outer peripheral surface of the first counterbore forming tool 20, thereby causing the seating tool from the concrete molded body 40. It is possible to effectively release the resistance when removing the 10A, prevent the shape of the counterbore hole 50 from being deformed due to the removal of the counterbore, and secure a good finished state of the concrete skeleton 60.

また、本実施の形態では、第１の座堀形成具２０と第２の座堀形成具３０とが、内孔２０ｄと嵌合部３０Ａとの嵌合以外でも、着脱可能に固定されている。すなわち、本実施の形態において、第１の座堀形成具２０および第２の座堀形成具３０は、前記取り外し治具を用いて第１の座堀形成具２０と第２の座堀形成具３０とが一体的にコンクリート成形体４０から取り外されるように互いに係止されている。具体的には、第２の座堀形成具３０の嵌合部３０Ａの外周面３０Ａｂには、非嵌合部３０Ｂとの境界部付近に、環状の係止溝３０Ａｃが設けられ、この係止溝３０Ａｃには、第１の座堀形成具２０の内孔２０ｄを形成する内周面に径方向内側に突出するように設けられる凸部２０ｆが係脱自在に係止されている。これによれば、第１の座堀形成具２０と第２の座堀形成具３０との嵌合状態を固定かつ安定させることができ、取り外し治具を用いて第１の座堀形成具２０と第２の座堀形成具３０とを確実に一体化させてコンクリート成形体４０から同時に取り外すことが可能となる。なお、それ以外の構成は、前述した第１の実施の形態と同様である。 Further, in the present embodiment, the first counterbore forming tool 20 and the second counterbore forming tool 30 are detachably fixed except for the fitting between the inner hole 20d and the fitting portion 30A. .. That is, in the present embodiment, the first counterbore forming tool 20 and the second counterbore forming tool 30 are the first counterbore forming tool 20 and the second counterbore forming tool 30 by using the removal jig. 30 and 30 are integrally locked to each other so as to be integrally removed from the concrete molded body 40. Specifically, an annular locking groove 30Ac is provided on the outer peripheral surface 30Ab of the fitting portion 30A of the second counterbore forming tool 30 near the boundary portion with the non-fitting portion 30B, and the locking groove 30Ac is provided. In the groove 30Ac, a convex portion 20f provided so as to project radially inward on the inner peripheral surface forming the inner hole 20d of the first counterbore forming tool 20 is detachably locked. According to this, the fitted state of the first counterbore forming tool 20 and the second counterbore forming tool 30 can be fixed and stabilized, and the first sitting moat forming tool 20 can be fixed and stabilized by using the removal jig. And the second counterbore forming tool 30 can be reliably integrated and removed from the concrete molded body 40 at the same time. The other configurations are the same as those of the first embodiment described above.

図６は、本発明の第３の実施の形態に係る座堀具１０Ｂと共にインサート８０を型枠９０に組み付けた状態を示す断面図である。本実施の形態は、第２の実施の形態の変形例であり、第１の座堀形成具２０と第２の座堀形成具３０との係止形態が第２の実施の形態のそれと逆になっている。すなわち、本実施の形態では、第１の座堀形成具２０の内孔２０ｄを形成する内周面に環状の係止溝２０ｈが設けられ、この係止溝２０ｈには、第２の座堀形成具３０の嵌合部３０Ａの外周面に径方向外側に突出するように設けられる凸部３０Ａｅが係脱自在に係止されている。あるいは、係止溝２０ｈを設けることなく、凸部３０Ａｅが第１の座堀形成具２０の内周面にそれを弾性的に窪むように変形させるべく食い込んで係止してもよい。 FIG. 6 is a cross-sectional view showing a state in which the insert 80 is assembled to the mold 90 together with the counterbore 10B according to the third embodiment of the present invention. This embodiment is a modification of the second embodiment, and the locking mode of the first counterbore forming tool 20 and the second counterbore forming tool 30 is opposite to that of the second embodiment. It has become. That is, in the present embodiment, an annular locking groove 20h is provided on the inner peripheral surface forming the inner hole 20d of the first counterbore forming tool 20, and the locking groove 20h is provided with the second counterbore. A convex portion 30Ae provided on the outer peripheral surface of the fitting portion 30A of the forming tool 30 so as to project outward in the radial direction is detachably locked. Alternatively, the convex portion 30Ae may bite into the inner peripheral surface of the first counterbore forming tool 20 so as to be elastically recessed and locked without providing the locking groove 20h.

また、本実施の形態では、このような係止形態を構成する第１の座堀形成具２０の内孔（内周面）２０ｄと第２の座堀形成具３０の嵌合部３０Ａとが、前述の第１および第２の実施の形態のようにテーパ面同士で嵌合せず、中心軸線Ｏに沿って直線状に延びる面同士で嵌合している。そして、この場合、第２の座堀形成具３０の嵌合部３０Ａの外周面には、凸部３０Ａｅに隣接して、座堀具取り外しステップＳ４における座堀具１０Ｂの取り外しの際の第１の座堀形成具２０の弾性変形（圧縮変形）を逃がすためのクリアランスを形成する環状の溝３０Ａｄが設けられている。なお、それ以外の構成は第２の実施の形態と同様である。 Further, in the present embodiment, the inner hole (inner peripheral surface) 20d of the first counterbore forming tool 20 constituting such a locking form and the fitting portion 30A of the second counterbore forming tool 30 are formed. , The tapered surfaces are not fitted to each other as in the first and second embodiments described above, but the surfaces extending linearly along the central axis O are fitted to each other. Then, in this case, the outer peripheral surface of the fitting portion 30A of the second counterbore forming tool 30 is adjacent to the convex portion 30Ae, and the first seating tool 10B is removed in the seating tool removing step S4. An annular groove 30Ad is provided to form a clearance for allowing the elastic deformation (compressive deformation) of the counterbore forming tool 20 to escape. The other configurations are the same as those of the second embodiment.

図７は、本発明の第４の実施の形態に係る座堀具１０Ｃと共にインサート８０を型枠９０に組み付けた状態を示す断面図である。本実施の形態は、第２の実施の形態の変形例であり、先細るテーパ形状の第１の座堀形成具２０の外周側面２０ｃが径方向外側に円弧状に膨出する膨出部６９の一部によって形成されている。すなわち、この膨出部６９は、第１の端面２０ａへ向かって径方向外側に広がる前述した部位２０ｅに隣接して第１の座堀形成具２０の外周面の一部を形成しており、第２の端面２０ｂから第１の端面２０ａの側へ向けて径方向外側に広がる部位６９ａと、この部位６９ａと膨出部６９の頂点で接続して第１の端面２０ａの側へ向けて径方向内側に先細る部位（先細るテーパ形状の第１の座堀形成具２０の外周側面２０ｃを形成する部位）６９ａとを有する。また、本実施の形態では、第２の実施の形態と異なり、第２の座堀形成具３０の嵌合部３０Ａに設けられた環状の係止溝３０Ａｃに係脱自在に係止する凸部２０ｆが第１の座堀形成具２０の内孔２０ｄを形成する内周面に設けられておらず、環状の係止溝３０Ａｃは、専ら、座堀具取り外しステップＳ４における座堀具１０Ｃの取り外しの際の第１の座堀形成具２０の弾性変形（圧縮変形）を逃がすためのクリアランスとして機能するようになっている。このような構成では、座堀具取り外しステップＳ４において第１の座堀形成具２０の弾性変形部が環状の溝３０Ａｃに係止されると、それ以降、第１の座堀形成具２０および第２の座堀形成具３０は、一体的状態が安定化されつつ前記取り外し治具によりコンクリート成形体４０から同時に取り外しできるようになる。 FIG. 7 is a cross-sectional view showing a state in which the insert 80 is assembled to the mold 90 together with the counterbore 10C according to the fourth embodiment of the present invention. This embodiment is a modification of the second embodiment, and is a bulging portion 69 in which the outer peripheral side surface 20c of the tapered first counterbore forming tool 20 bulges outward in a radial direction in an arc shape. It is formed by a part of. That is, the bulging portion 69 forms a part of the outer peripheral surface of the first counterbore forming tool 20 adjacent to the above-mentioned portion 20e extending radially outward toward the first end surface 20a. A portion 69a that extends radially outward from the second end surface 20b toward the side of the first end surface 20a, and is connected to this portion 69a at the apex of the bulging portion 69 and has a diameter toward the side of the first end surface 20a. It has a portion 69a that tapers inward in the direction (a portion that forms the outer peripheral side surface 20c of the first counterbore forming tool 20 having a tapered shape). Further, in the present embodiment, unlike the second embodiment, the convex portion that is detachably engaged with the annular locking groove 30Ac provided in the fitting portion 30A of the second counterbore forming tool 30. 20f is not provided on the inner peripheral surface forming the inner hole 20d of the first counterbore forming tool 20, and the annular locking groove 30Ac is exclusively for removing the counterbore 10C in the counterbore removing step S4. It functions as a clearance for releasing the elastic deformation (compressive deformation) of the first counterbore forming tool 20 at the time of. In such a configuration, when the elastically deformed portion of the first counterbore forming tool 20 is locked in the annular groove 30Ac in the counterbore forming tool removal step S4, the first counterbore forming tool 20 and the first counterbore forming tool 20 are thereafter. The counterbore forming tool 30 of No. 2 can be simultaneously removed from the concrete molded body 40 by the removing jig while the integrated state is stabilized.

図８は、本発明の第５の実施の形態に係る座堀具１０Ｄと共にインサート８０を型枠９０に組み付けた状態を示す断面図である。本実施の形態は、第１の実施の形態の変形例であり、第２の端面２０ｂから第１の端面２０ａへ向けて先細るテーパ形状の第１の座堀形成具２０の外周側面が円弧状の断面形状を有する外周側面２０ｃ’として形成されている。このような円弧状の外周側面２０ｃ’は、座堀具取り外しステップＳ４における座堀具１０Ｄの取り外しの際の第１の座堀形成具２０の弾性変形時（圧縮変形時）に、図８の左側の半断面に示されるように、第２の座堀形成具３０の嵌合部３０Ａの先細りテーパ状の外周側面３０Ａｂによる変形誘導作用との協働によって第１の座堀形成具２０を断面が矩形状の圧縮状態へと変形させ、コンクリート成形体４０からの座堀具１０のスムーズな離脱を促すようになる。 FIG. 8 is a cross-sectional view showing a state in which the insert 80 is assembled to the mold 90 together with the counterbore 10D according to the fifth embodiment of the present invention. This embodiment is a modification of the first embodiment, and the outer peripheral side surface of the first counterbore forming tool 20 having a tapered shape tapering from the second end surface 20b to the first end surface 20a is circular. It is formed as an outer peripheral side surface 20c'having an arc-shaped cross-sectional shape. Such an arcuate outer peripheral side surface 20c'is shown in FIG. 8 when the first counterbore forming tool 20 is elastically deformed (compressively deformed) when the counterbore 10D is removed in the counterbore removal step S4. As shown in the left half-section, the first counterbore forming tool 20 is cross-sectioned in cooperation with the deformation inducing action of the tapered outer peripheral side surface 30Ab of the fitting portion 30A of the second counterbore forming tool 30. Deforms into a rectangular compressed state, and promotes smooth detachment of the counterbore 10 from the concrete molded body 40.

１０座堀具
２０第１の座堀形成具
２０ａ第１の端面
２０ｂ第２の端面
２０ｃ外周側面
２０ｄ内孔
３０第２の座堀形成具
３０Ａ嵌合部
３０Ｂ非嵌合部
３０Ｂｂ外周側面
４０コンクリート成形体
５０座堀穴
６０コンクリート躯体
８０インサート
９０型枠 10 Seating tool 20 First seating tool 20a First end face 20b Second end face 20c Outer side surface 20d Inner hole 30 Second seating tool 30A Fitting part 30B Non-fitting part 30Bb Outer side side 40 Concrete Molded body 50 Counterbore hole 60 Concrete skeleton 80 Insert 90 Formwork

Claims

It is a method of forming a concrete skeleton in which an insert is embedded in concrete and a counterbore hole leading to the insert is formed on the concrete surface at the embedded position.
Fastening and fixing step of fastening and fixing a counterbore formed by combining a first counterbore forming tool formed of an elastic material and a second counterbore forming tool made of steel to a formwork using a fastener together with the insert. When,
A concrete placing step of pouring concrete into the formwork in a state where the counterbore and the insert are fastened and fixed to the formwork by the fastener.
After the concrete is hardened, the demolding step of removing the concrete molded body in which the insert is embedded with the counterbore from the formwork by releasing the fastening state by the fastener.
A step of removing the counterbore from the concrete molded body using a removal jig, and a step of removing the counterbore.
Including
The first counterbore forming tool has a cylindrical shape, and has a first end surface that is in contact with the formwork, a second end surface on the opposite end side thereof, the first end surface, and the second end surface. The outer peripheral side surface has an outer peripheral side surface that connects to the end face of the above, and the outer peripheral side surface forms a tapered shape that tapers from the second end face toward the first end face.
The second counterbore forming tool has a fitting portion that fits into the inner hole of the first counterbore forming tool, and is outside the first counterbore forming tool defined by the outer peripheral side surface. It is attached to the first counterbore forming tool so that it fits inside the diameter.
In the fastening fixing step, the counterbore is assembled with the insert in a state where the first end surface of the first counterbore forming tool is in contact with the formwork, and the fastener is used to the formwork. Fastened and fixed,
In the counterbore removal step, when the counterbore is removed by the removal jig attached to the second counterbore, the first counterbore is elastically compressed and deformed while the seat is elastically deformed. When the moat is removed from the concrete molded body, a counterbore hole leading to the insert as it is embedded in the concrete is formed by opening tapered toward the surface of the concrete molded body.
A molding method characterized by that.

The second counterbore forming tool further has a non-fitting portion protruding from the inner hole on the side of the second end surface of the first counterbore forming tool, and the non-fitting portion is the above-mentioned non-fitting portion. It is formed as a columnar body having an outer peripheral side surface that tapers toward the second end surface of the first counterbore forming tool.
In the counterbore removing step, when the counterbore is removed by the removal jig attached to the second counterbore, the first counterbore is elastically compressed and deformed, and the first is. The counterbore is removed from the concrete molded body by the guidance of the outer peripheral side surface of the non-fitting portion of the counterbore forming tool of 2.
The molding method according to claim 1, wherein the molding method is characterized by the above.

The molding method according to claim 1 or 2, wherein the second counterbore forming tool defines the depth of the counterbore hole.

One of claims 1 to 3, wherein the first counterbore forming tool has a thickness dimension on the side of the first end face larger than a thickness dimension on the side of the second end face. The molding method described in the section.

Claims 1 to 4 are characterized in that in the fastening fixing step, the first counterbore forming tool is compressed and deformed in the axial direction by the fastener used to be fastened to the insert and the second counterbore forming tool. The molding method according to any one of the above.

The fifth aspect of the present invention, wherein in the demolding step, the concrete molded body is demolded from the formwork by utilizing the elastic restoring force of the first counterbore forming tool that has been compression-deformed. Molding method.

The outer peripheral side surface of the first counterbore forming tool having a tapered shape that tapers from the second end face toward the first end face has an end edge portion on the side of the first end face of the first end face. The molding method according to any one of claims 1 to 6, wherein the molding method is formed as an inclined surface extending radially outward toward the end surface.

The molding method according to any one of claims 1 to 7, wherein the first counterbore forming tool and the second counterbore forming tool are detachably fixed.

In the first counterbore forming tool and the second counterbore forming tool, the first sitting moat forming tool and the second sitting moat forming tool are integrally formed of the concrete by using the removal jig. The molding method according to any one of claims 1 to 7, wherein the molding methods are locked to each other so as to be removed from the molded body.

The inner peripheral surface of the first counterbore forming tool that forms the inner hole has a tapered shape that tapers from the second end face toward the first end face, and the first counterbore forming tool has a tapered shape. The outer peripheral side surface of the fitting portion of the second counterbore forming tool to be fitted into the inner hole has a tapered shape corresponding to the tapered shape of the inner peripheral surface of the first counterbore forming tool. The molding method according to any one of claims 1 to 9, wherein the molding method is characterized.

A counterbore for forming a counterbore hole leading to the insert on the surface of the concrete at the embedding position of the insert embedded in the concrete.
It consists of a combination of a first counterbore forming tool formed of an elastic material and a second counterbore forming tool made of steel.
The first counterbore forming tool has a tubular shape and a first end surface that is brought into contact with the formwork into which the concrete is poured, and a second end surface on the opposite end side thereof. It has an outer peripheral side surface that connects the first end face and the second end face, and the outer peripheral side surface forms a tapered shape that tapers from the second end face toward the first end face.
The second counterbore forming tool has a fitting portion that fits into the inner hole of the first counterbore forming tool, and is outside the first counterbore forming tool defined by the outer peripheral side surface. Assembled to the first counterbore forming tool so as to fit inside the diameter.
A sitting moat that is characterized by that.

The second counterbore forming tool further has a non-fitting portion protruding from the inner hole on the side of the second end surface of the first counterbore forming tool, and the non-fitting portion further comprises a non-fitting portion. The counterbore according to claim 11, wherein the counterbore is formed as a columnar body having an outer peripheral side surface that tapers toward the second end surface of the first counterbore.

The counterbore according to claim 11 or 12, wherein the second counterbore forming tool defines the depth of the counterbore.

One of claims 11 to 13, wherein the first counterbore forming tool has a thickness dimension on the side of the first end face larger than a thickness dimension on the side of the second end face. The sitting moat described in the section.

The outer peripheral side surface of the first counterbore forming tool having a tapered shape that tapers from the second end face toward the first end face has an end edge portion on the side of the first end face of the first end face. The counterbore according to any one of claims 11 to 14, wherein the counterbore is formed as an inclined surface extending radially outward toward an end surface.

The sitting moat according to any one of claims 11 to 15, wherein the first sitting moat forming tool and the second sitting moat forming tool are detachably fixed.

The counterbore according to any one of claims 11 to 16, wherein the first counterbore forming tool and the second counterbore forming tool are locked to each other in the assembled and fitted state. Ingredients.

The inner peripheral surface of the first counterbore forming tool that forms the inner hole has a tapered shape that tapers from the second end face toward the first end face, and the first counterbore forming tool has a tapered shape. The outer peripheral side surface of the fitting portion of the second counterbore forming tool to be fitted into the inner hole has a tapered shape corresponding to the tapered shape of the inner peripheral surface of the first counterbore forming tool. The counterbore according to any one of claims 11 to 17, which is characteristic.