JP7836716B2 - Joint structure - Google Patents
Joint structureInfo
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- JP7836716B2 JP7836716B2 JP2022093046A JP2022093046A JP7836716B2 JP 7836716 B2 JP7836716 B2 JP 7836716B2 JP 2022093046 A JP2022093046 A JP 2022093046A JP 2022093046 A JP2022093046 A JP 2022093046A JP 7836716 B2 JP7836716 B2 JP 7836716B2
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Description
本発明は、コンクリート部材同士の接合構造に関する。 This invention relates to a joining structure for concrete members.
建設工事では、工期短縮化を目的として、プレキャスト部材を使用する場合がある。プレキャスト部材は、現場打ちコンクリートにより形成された他のコンクリート部材や、他のプレキャスト部材と、モルタル等を介して接合するのが一般的である。
例えば、図７に示すように、プレキャスト製のフーチング部材１２０と、コンクリート杭との接合構造１００として、フーチング部材１２０の底面に凹部１２１を形成しておき、この凹部１２１に杭頭部（凸部１３１）を挿入した状態で、フーチング部材１２０の凹部１２１と杭頭部と１３１の隙間にモルタルなどの充填材１４０を充填する場合がある（例えば、特許文献１参照）。
このような接合構造１００では、凹部１２１への充填材１４０の充填状況を目視で確認することができないため、凹部１２１の中央付近に形成された注入孔１２２から充填材１４０の注入を行い、凹部１２１の縁部（角部）近傍に形成された複数の空気孔１２３から充填材１４０の排出を確認することで、充填が完了したものとするのが一般的であった。
なお、凹部１２１の中央付近に形成された注入孔１２２から注入された充填材１４０は、図８（ａ）に示すように、凸部１３１の上面において同心円状に広がり、図８（ｂ）に示すように凸部１３１の縁に到達して凸部１３１の縁から流下する。凸部１３１の縁から流下した充填材１４０は、図８（ｃ）に示すように、凹部１２１の内壁面と凸部１３１の側面との間を流れる。一方、充填材１４０は、必ずしも凸部１３１上面全体に広がってから流下するとは限らない。凸部１３１の縁から充填材１４０が流下する際は、同じルートを辿ることが推測される。そのため、特に凸部１３１の上面が平面視矩形の場合等においては、凹部１２１の縁部に形成された空気孔１２３から充填材１４０の排出が確認された場合であっても、空気孔１２３の中央寄りの部分において未充填箇所が生じるおそれがあり、凸部１３１と凹部１２１との隙間への充填材１４０の充填完了を簡易に判断する方法がない。
In construction projects, precast members are sometimes used to shorten the construction period. Precast members are typically joined to other concrete members formed by cast-in-place concrete, or to other precast members, via mortar or similar materials.
For example, as shown in Figure 7, in a joint structure 100 between a precast footing member 120 and a concrete pile, a recess 121 is formed on the bottom surface of the footing member 120, and with the pile head (protrusion 131) inserted into this recess 121, a filler material 140 such as mortar is filled into the gap between the recess 121 of the footing member 120 and the pile head 131 (see, for example, Patent Document 1).
In such a joint structure 100, it is not possible to visually confirm the status of filling the recess 121 with the filler material 140. Therefore, it was common practice to inject the filler material 140 through an injection hole 122 formed near the center of the recess 121 and to confirm the discharge of the filler material 140 through a plurality of air holes 123 formed near the edge (corner) of the recess 121, thereby indicating that filling was complete.
The filler material 140 injected through the injection hole 122 formed near the center of the recess 121 spreads concentrically on the upper surface of the protrusion 131, as shown in Figure 8(a), reaches the edge of the protrusion 131, and flows down from the edge of the protrusion 131, as shown in Figure 8(b). The filler material 140 that flows down from the edge of the protrusion 131 flows between the inner wall surface of the recess 121 and the side surface of the protrusion 131, as shown in Figure 8(c). On the other hand, the filler material 140 does not necessarily spread across the entire upper surface of the protrusion 131 before flowing down. When the filler material 140 flows down from the edge of the protrusion 131, it is presumed to follow the same route. Therefore, especially when the upper surface of the protrusion 131 is rectangular in plan view, even if the discharge of the filler material 140 from the air hole 123 formed on the edge of the recess 121 is confirmed, there is a risk that unfilled areas may remain near the center of the air hole 123, and there is no easy way to determine when the filler material 140 has been filled into the gap between the protrusion 131 and the recess 121.
このような観点から、本発明は、上側のコンクリート部材の下面に形成された凹部に、下側のコンクリート部材の上端に形成された凸部を挿入した状態で、凹部に充填材を充填することによりコンクリート部材同士を接合する接合部において、より確実に充填材を充填することを可能とした接合構造を提案することを課題とする。 From this perspective, the present invention aims to propose a joint structure that enables more reliable filling of a filler material in a joint between concrete members, where a protrusion formed on the upper end of a lower concrete member is inserted into a recess formed on the lower surface of an upper concrete member, and a filler material is then filled into the recess.
前記課題を解決するために、本発明は、上側に配設された上側コンクリート部材と下側に配設された下側コンクリート部材とを接合する接合構造であって、前記上側コンクリート部材の下面に形成された凹部と、前記上側コンクリート部材の側面または上面から前記凹部の中央部に至る注入孔と、前記上側コンクリート部材の側面または上面から前記凹部に至る複数の空気孔と、前記下側コンクリート部材の上部に形成された前記凹部に挿入される凸部と、前記注入孔から前記凹部と前記凸部との隙間に充填される充填材とを備えている。前記凸部は、平面視で五つ以上の角部を有する。
なお、前記凹部が前記凸部と同数の角部を有する平面視多角形状の場合には、前記空気孔が前記凹部の各角部近傍において開口しているのが望ましい。また、前記凹部が平面視円形状の場合には、前記空気孔が凸部上面の平面的な中心と凸部の各角部とを放射状に結ぶ線の延長線上で凹部内壁の円周との交点近傍に開口しているのが望ましい。
To solve the aforementioned problems, the present invention provides a joining structure for joining an upper concrete member disposed on the upper side and a lower concrete member disposed on the lower side, comprising: a recess formed on the lower surface of the upper concrete member; an injection hole extending from the side or top surface of the upper concrete member to the center of the recess; a plurality of air holes extending from the side or top surface of the upper concrete member to the recess; a protrusion formed on the upper part of the lower concrete member and inserted into the recess; and a filler material that fills the gap between the recess and the protrusion from the injection hole. The protrusion has five or more corners in a plan view.
Furthermore, if the recess has the same number of corners as the convex portion and is polygonal in plan view, it is desirable that the air holes open near each corner of the recess. Also, if the recess has a circular shape in plan view, it is desirable that the air holes open near the intersection of the extension of the line connecting the planar center of the upper surface of the convex portion and each corner of the convex portion with the circumference of the inner wall of the recess.
かかる接合構造を構築する際は、凹部の中央付近から注入した充填材が、凸部の上面において同心円状に広がり、凸部の各辺から流下して、凹部の内壁面に至った後、凹部の内壁面と凸部の側面との間を流れる。凸部の平面形状を五つ以上の辺を有する多角形状とすると、四角形の場合よりも多くの辺から充填材が流下し、多方向に分かれて凹部の内壁面と凸部の側面との隙間に流れ込むようになるため、未充填箇所が形成され難い。
なお、前記凹部が、前記凸部と同数の角部を有する多角形状であれば、充填材の量を最小限に抑えることができるため、合理的である。
When constructing such a joint structure, the filler injected from near the center of the recess spreads concentrically on the upper surface of the convex portion, flows down from each side of the convex portion, reaches the inner wall surface of the recess, and then flows between the inner wall surface of the recess and the side surface of the convex portion. If the planar shape of the convex portion is a polygon with five or more sides, the filler flows down from more sides than in the case of a quadrilateral, and divides in multiple directions to flow into the gap between the inner wall surface of the recess and the side surface of the convex portion, making it difficult for unfilled areas to form.
Furthermore, if the recess has a polygonal shape with the same number of corners as the protrusion, the amount of filler can be minimized, which is therefore rational.
本発明の接合構造によれば、上側のコンクリート部材の下面に形成された凹部に、下側のコンクリート部材の上端に形成された凸部を挿入した状態で、凹部に充填材を充填することによりコンクリート部材同士を接合する接合部において、より確実に充填材を充填することが可能となる。 According to the joint structure of the present invention, in a joint where concrete members are joined by inserting a protrusion formed on the upper end of a lower concrete member into a recess formed on the lower surface of an upper concrete member, and then filling the recess with a filler material, it becomes possible to more reliably fill the filler material.
＜第一実施形態＞
第一実施形態では、杭基礎構造において、杭（下側コンクリート部材）３の杭頭部３１とプレキャスト製のフーチング（上側コンクリート部材）２とを接合する場合について説明する。図１にフーチング２と杭３との接合構造１を示す。本実施形態では、杭３の杭頭部３１およびキャップ部材３２が、フーチング２の凹部２１に挿入される凸部を構成する場合について説明する。
図１（ａ）および（ｂ）に示すように、フーチング２の下面には、平面視正八角形状の凹部２１が形成されている。また、フーチング２には、注入孔２２および複数の空気孔２３が形成されている。注入孔２２は、フーチング２の側面から凹部２１の中央部に至るように形成されている。また、複数の空気孔２３は、フーチング２の側面から凹部２１に至るように形成されている。各空気孔２３は、それぞれ凹部２１の角部近傍において開口している。
<First Embodiment>
In the first embodiment, a case in which the pile head 31 of the pile (lower concrete member) 3 and the precast footing (upper concrete member) 2 are joined in a pile foundation structure will be described. Figure 1 shows the joining structure 1 between the footing 2 and the pile 3. In this embodiment, a case will be described in which the pile head 31 and the cap member 32 of the pile 3 constitute a protrusion that is inserted into the recess 21 of the footing 2.
As shown in Figures 1(a) and (b), a recess 21 with a regular octagonal shape in plan view is formed on the lower surface of the footing 2. The footing 2 also has an injection hole 22 and a plurality of air holes 23. The injection hole 22 is formed to extend from the side of the footing 2 to the center of the recess 21. The plurality of air holes 23 are also formed to extend from the side of the footing 2 to the recess 21. Each air hole 23 opens near the corner of the recess 21.
杭３の上端（凸部）は、凹部２１に挿入可能で、かつ、平面視正八角形状を呈している。杭頭部３１は、フーチング２が載置される床付け面５から突出している。本実施形態の杭頭部３１は、杭頭処理として、凹部２１に挿入可能な平面視正八角形状のキャップ部材３２が形成されている。
接合構造１は、凹部２１に杭頭部３１（キャップ部材３２）を挿入した状態で、凹部２１と杭頭部３１（キャップ部材３２）との隙間に注入孔２２から注入した充填材４を充填してなる。充填材４には、流動性を有し、かつ、硬化後に所定の強度を発現する隙間を塞ぐのに適した材料を使用すればよく、例えば無収縮モルタルを使用すればよい。
The upper end (protrusion) of the pile 3 is insertable into the recess 21 and has a regular octagonal shape in plan view. The pile head 31 protrudes from the floor surface 5 on which the footing 2 is placed. In this embodiment, the pile head 31 has a cap member 32 that is insertable into the recess 21 and has a regular octagonal shape in plan view.
The joint structure 1 is formed by inserting the pile head 31 (cap member 32) into the recess 21 and filling the gap between the recess 21 and the pile head 31 (cap member 32) with a filler material 4 injected through the injection hole 22. The filler material 4 can be any material that is fluid and suitable for sealing gaps and exhibits a predetermined strength after hardening; for example, non-shrink mortar can be used.
以下、本実施形態の接合構造１を利用した杭基礎構造の構築方法について説明する。
本実施形態の杭基礎構造の構築方法は、杭構築工程と、杭頭処理工程と、基礎配設工程と、接合工程とを有している。図２に杭基礎構造の構築方法の作業状況を示す。
杭構築工程は、図２（ａ）に示すように、杭３を構築する工程である。本実施形態では、円柱状のプレキャスト部材を地盤Ｇに圧入することにより杭３を構築するが、杭３の種類や施工方法は限定されるものではない。杭３の圧入は、図示しない回転圧入装置を用いて行う。
杭３の施工が完了したら、杭頭部３１の周囲の地盤面ＧＬを掘り下げて、杭頭部３１を露出させるとともに、地盤面ＧＬ（床付け面）の不陸を整正する。なお、杭３の施工を杭頭部３１が露出した位置で止める場合は、地盤面ＧＬを掘り下げる必要はない。
The following describes a method for constructing a pile foundation structure using the joint structure 1 of this embodiment.
The method for constructing a pile foundation structure according to this embodiment includes a pile construction step, a pile head treatment step, a foundation placement step, and a joining step. Figure 2 shows the work process for constructing a pile foundation structure.
The pile construction process is the process of constructing the pile 3, as shown in Figure 2(a). In this embodiment, the pile 3 is constructed by pressing a cylindrical precast member into the ground G, but the type of pile 3 and the construction method are not limited. The pile 3 is pressed in using a rotary press-in device (not shown).
Once the construction of pile 3 is complete, the ground surface GL around the pile head 31 is excavated to expose the pile head 31, and any unevenness in the ground surface GL (base surface) is leveled. However, if the construction of pile 3 is stopped at the point where the pile head 31 is exposed, it is not necessary to excavate the ground surface GL.
杭頭処理工程は、図２（ｂ）に示すように、杭３の杭頭部３１にキャップ部材３２を形成する工程である。キャップ部材３２は、杭頭部３１がキャップ部材３２の下面に密着するように覆い被せた状態で形成する。キャップ部材３２は、凹部２１に挿入可能な大きさの平面視正八角形状のブロック状部材であって、底面に杭頭部３１を挿入可能な円錐台状窪みが形成されている。キャップ部材３２を形成したら、キャップ部材３２の下端部の周囲に地盤材料（砕石や土砂等）５１を敷き均し、キャップ部材３２の下端縁と地盤面ＧＬとの隙間を閉塞するとともに、キャップ部材３２を仮固定する。キャップ部材３２を仮固定したら、必要に応じて均しコンクリート５２を打設する。 The pile head treatment process, as shown in Figure 2(b), involves forming a cap member 32 on the pile head 31 of the pile 3. The cap member 32 is formed so that it covers the pile head 31, ensuring close contact with the lower surface of the cap member 32. The cap member 32 is a block-shaped member with a regular octagonal shape in plan view, sized to fit into the recess 21, and has a frustoconical recess on its bottom surface into which the pile head 31 can be inserted. After forming the cap member 32, ground material (crushed stone, soil, etc.) 51 is spread around the lower end of the cap member 32 to close the gap between the lower edge of the cap member 32 and the ground surface GL, and to temporarily fix the cap member 32. After temporarily fixing the cap member 32, leveling concrete 52 is poured as needed.
基礎配設工程は、図２（ｃ）に示すように、プレキャストコンクリート部材からなるフーチング２を配設する工程である。フーチング２は、凹部２１でキャップ部材３２（杭頭部３１）を覆うように、杭頭部３１の上方から配設する。 The foundation installation process involves installing the footing 2, which is made of precast concrete members, as shown in Figure 2(c). The footing 2 is installed from above the pile head 31, with the recess 21 covering the cap member 32 (pile head 31).
接合工程は、杭頭部３１とフーチング２とを接合する工程である。杭頭部３１とフーチング２との接合は、図２（ｃ）に示すように、注入孔２２から充填材４を注入し、凹部２１とキャップ部材３２（杭頭部３１）との隙間に充填材４を充填することにより行う。充填材４の注入に伴い、凹部２１とキャップ部材３２との隙間の空気が、空気孔２３から排気される。凹部２１とキャップ部材３２との隙間が充填材４により充填されると空気孔２３から充填材４が排出される。すべての空気孔２３から充填材４の排出が確認されたら、凹部２１に充填材４が充填されたとして、充填材４の注入を終了する。
図３に充填材４の注入状況を示す。注入孔２２から注入された充填材４は、図３（ａ）に示すように、杭３（キャップ部材３２）の上面において同心円状に広がった後、図３（ｂ）に示すように、キャップ部材３２の縁（辺）に到達する。充填材４は、キャップ部材３２の縁に到達すると、キャプ部材３２の縁（各辺）からキャップ部材３２の側面と凹部２１の内壁面との隙間（溝Ｔ）に流下する。そして、当該隙間（溝Ｔ）に流下した充填材４は、図３（ｃ）に示すように、凹部２１の内壁面とキャップ部材３２の側面との隙間（溝Ｔ）を流れる。凹部２１の内壁面とキャップ部材３２の側面との隙間（溝Ｔ）に充填材４が充填されると、隙間（溝Ｔ）からあふれた充填材４がキャップ部材３２（杭頭部３１）の上面周縁の内側で、かつ、キャップ部材３２（杭頭部３１）の周縁に内接する円の外側の領域に流れ込み、凹部２１の内部が充填材４により充填される（図１参照）。
The joining process involves joining the pile head 31 to the footing 2. As shown in Figure 2(c), the joining of the pile head 31 to the footing 2 is performed by injecting the filler material 4 through the injection hole 22 and filling the gap between the recess 21 and the cap member 32 (pile head 31) with the filler material 4. As the filler material 4 is injected, the air in the gap between the recess 21 and the cap member 32 is exhausted through the air hole 23. Once the gap between the recess 21 and the cap member 32 is filled with the filler material 4, the filler material 4 is discharged from the air hole 23. Once it is confirmed that the filler material 4 has been discharged from all the air holes 23, it is considered that the recess 21 has been filled with the filler material 4, and the injection of the filler material 4 is terminated.
Figure 3 shows the injection process of the filler material 4. As shown in Figure 3(a), the filler material 4 injected from the injection hole 22 spreads concentrically on the upper surface of the pile 3 (cap member 32), and then reaches the edge (side) of the cap member 32, as shown in Figure 3(b). When the filler material 4 reaches the edge of the cap member 32, it flows down from the edge (each side) of the cap member 32 into the gap (groove T) between the side surface of the cap member 32 and the inner wall surface of the recess 21. The filler material 4 that has flowed down into the gap (groove T) then flows through the gap (groove T) between the inner wall surface of the recess 21 and the side surface of the cap member 32, as shown in Figure 3(c). When the filler material 4 is filled into the gap (groove T) between the inner wall surface of the recess 21 and the side surface of the cap member 32, the filler material 4 that overflows from the gap (groove T) flows into the area inside the upper peripheral edge of the cap member 32 (pile head 31) and the area outside the circle inscribed in the peripheral edge of the cap member 32 (pile head 31), and the inside of the recess 21 is filled with the filler material 4 (see Figure 1).
本実施形態の接合構造１によれば、杭頭部３１（下側コンクリート部材の上部）の平面形状が八角形状であるため、充填材４が多方向に分かれて凹部２１の内壁面と杭頭部３１の側面との隙間に流れ込むようになる。その結果、下側コンクリート部材の上部の平面形状を四角形状とした場合に比べて、未充填箇所が形成され難い。
また、凹部２１は、杭頭部３１（キャップ部材３２）と同数の角部を有しているため、充填材４の量を最小限に抑えることができ、合理的である。
According to the joint structure 1 of this embodiment, since the planar shape of the pile head 31 (the upper part of the lower concrete member) is octagonal, the filler material 4 is divided in multiple directions and flows into the gap between the inner wall surface of the recess 21 and the side surface of the pile head 31. As a result, it is less likely for unfilled areas to form compared to the case where the planar shape of the upper part of the lower concrete member is square.
Furthermore, since the recess 21 has the same number of corners as the pile head 31 (cap member 32), the amount of filling material 4 can be minimized, which is rational.
＜第二実施形態＞
第二実施形態では、第一実施形態と同様に、杭基礎構造において、杭（下側コンクリート部材）３の杭頭部３１とプレキャスト製のフーチング（上側コンクリート部材）２とを接合する場合について説明する。図４に第二実施形態の接合構造１を示す。
図４（ａ）および（ｂ）に示すように、フーチング２の下面には、平面視円形の凹部２１が形成されている。また、フーチング２には、注入孔２２および複数の空気孔２３が形成されている。注入孔２２は、フーチング２の側面から凹部２１の中央部に至るように形成されている。また、複数の空気孔２３は、フーチング２の側面から凹部２１に至るように形成されている。
<Second Embodiment>
In the second embodiment, similar to the first embodiment, we will describe the case in which the pile head 31 of the pile (lower concrete member) 3 and the precast footing (upper concrete member) 2 are joined in a pile foundation structure. Figure 4 shows the joining structure 1 of the second embodiment.
As shown in Figures 4(a) and (b), a circular recess 21 is formed on the lower surface of the footing 2 in plan view. The footing 2 also has an injection hole 22 and a plurality of air holes 23. The injection hole 22 is formed to extend from the side of the footing 2 to the center of the recess 21. The plurality of air holes 23 are also formed to extend from the side of the footing 2 to the recess 21.
杭３の杭頭部３１（凸部）は、凹部２１に挿入可能で、かつ、平面視正八角形状を呈している。杭頭部３１は、フーチング２が載置される床付け面５から突出している。本実施形態の杭頭部３１は、杭頭処理として、凹部２１に挿入可能な平面視正八角形状のキャップ部材３２が設けられている。
接合構造１は、凹部２１に杭頭部３１（キャップ部材３２）を挿入した状態で、凹部２１と杭頭部３１との隙間に注入孔２２から注入した充填材４を充填してなる。充填材４には、流動性を有し、かつ、硬化後に所定の強度を発現する隙間を塞ぐのに適した材料を使用すればよく、例えば無収縮モルタルを使用すればよい。
The pile head 31 (protruding portion) of the pile 3 is insertable into the recess 21 and has a regular octagonal shape in plan view. The pile head 31 protrudes from the floor surface 5 on which the footing 2 is placed. In this embodiment, the pile head 31 is provided with a cap member 32 that has a regular octagonal shape in plan view and is insertable into the recess 21 as a pile head treatment.
The joint structure 1 is formed by inserting the pile head 31 (cap member 32) into the recess 21 and filling the gap between the recess 21 and the pile head 31 with a filler material 4 injected through the injection hole 22. The filler material 4 can be any material that is fluid and suitable for sealing gaps and exhibits a predetermined strength after hardening; for example, non-shrink mortar can be used.
図５に空気孔２３の形成箇所を示す。図５に示すように、空気孔２３は、凹部２１の縁部に沿う領域（凹部２１の縁部（内壁）と杭頭部３１の縁部（外周）との間の領域）に形成されている。空気孔２３は、杭頭部３１（キャップ部材３２）の上面の平面的な中心Ｏとキャップ部材３２の角部とを放射状に結ぶ線Ｌの延長線上で、かつ、凹部２１の内壁の円周と線Ｌとの交点近傍において開口している。 Figure 5 shows the location where the air holes 23 are formed. As shown in Figure 5, the air holes 23 are formed in the region along the edge of the recess 21 (the region between the edge (inner wall) of the recess 21 and the edge (outer circumference) of the pile head 31). The air holes 23 open on the extension of the line L that radially connects the planar center O of the upper surface of the pile head 31 (cap member 32) and the corner of the cap member 32, and near the intersection of the circumference of the inner wall of the recess 21 and line L.
以下、本実施形態の接合構造１を利用した杭基礎構造の構築方法について説明する。
本実施形態の杭基礎構造の構築方法は、杭構築工程と、杭頭処理工程と、基礎配設工程と、接合工程とを有している。
なお、杭構築工程、杭頭処理工程および基礎配設工程の詳細は、第一実施形態で示した内容と同様なため、詳細な説明は省略する（図２参照）。
The following describes a method for constructing a pile foundation structure using the joint structure 1 of this embodiment.
The method for constructing a pile foundation structure according to this embodiment includes a pile construction step, a pile head treatment step, a foundation placement step, and a joining step.
The details of the pile construction process, pile head treatment process, and foundation installation process are the same as those shown in the first embodiment, so a detailed explanation is omitted (see Figure 2).
接合工程は、杭頭部３１とフーチング２とを接合する工程である。杭頭部３１とフーチング２との接合は、注入孔２２から充填材４を注入し、凹部２１とキャップ部材３２（杭頭部３１）との隙間に充填材４を充填することにより行う（図２（ｃ）参照）。充填材４の注入に伴い、凹部２１とキャップ部材３２との隙間の空気が、空気孔２３から排気される。凹部２１とキャップ部材３２との隙間が充填材４により充填されると空気孔２３から充填材４が排出される。すべての空気孔２３から充填材４の排出が確認されたら、凹部２１に充填材４が充填されたとして、充填材４の注入を終了する。
図６に充填材４の注入状況を示す。注入孔２２から注入された充填材４は、図６（ａ）に示すように、杭３（キャップ部材３２）の上面において同心円状に広がった後、図６（ｂ）に示すように、キャップ部材３２の縁（辺）に到達する。充填材４は、キャップ部材３２の縁に到達すると、キャップ部材３２の縁（各辺）からキャップ部材３２の側面と凹部２１の内壁面との隙間（溝Ｔ）に流下する。そして、当該隙間（溝Ｔ）に流下した充填材４は、図６（ｃ）に示すように、凹部２１の内壁面とキャップ部材３２の側面との隙間（溝Ｔ）を流れる。凹部２１の内壁面とキャップ部材３２の側面との隙間（溝Ｔ）に充填材４が充填されると、隙間（溝Ｔ）からあふれた充填材４がキャップ部材３２（杭頭部３１）の上面周縁の内側で、かつ、キャップ部材３２（杭頭部３１）の周縁に内接する円の外側の領域に流れ込み、凹部２１の内部が充填材４により充填される（図１参照）。
The joining process involves joining the pile head 31 to the footing 2. The joining of the pile head 31 to the footing 2 is performed by injecting the filler material 4 through the injection hole 22 and filling the gap between the recess 21 and the cap member 32 (pile head 31) with the filler material 4 (see Figure 2(c)). As the filler material 4 is injected, the air in the gap between the recess 21 and the cap member 32 is exhausted through the air hole 23. Once the gap between the recess 21 and the cap member 32 is filled with the filler material 4, the filler material 4 is discharged from the air hole 23. Once it is confirmed that the filler material 4 has been discharged from all the air holes 23, it is assumed that the recess 21 has been filled with the filler material 4, and the injection of the filler material 4 is terminated.
Figure 6 shows the injection process of the filler material 4. As shown in Figure 6(a), the filler material 4 injected from the injection hole 22 spreads concentrically on the upper surface of the pile 3 (cap member 32), and then reaches the edge (side) of the cap member 32, as shown in Figure 6(b). When the filler material 4 reaches the edge of the cap member 32, it flows down from the edge (each side) of the cap member 32 into the gap (groove T) between the side surface of the cap member 32 and the inner wall surface of the recess 21. The filler material 4 that has flowed down into the gap (groove T) then flows through the gap (groove T) between the inner wall surface of the recess 21 and the side surface of the cap member 32, as shown in Figure 6(c). When the filler material 4 is filled into the gap (groove T) between the inner wall surface of the recess 21 and the side surface of the cap member 32, the filler material 4 that overflows from the gap (groove T) flows into the area inside the upper peripheral edge of the cap member 32 (pile head 31) and the area outside the circle inscribed in the peripheral edge of the cap member 32 (pile head 31), and the inside of the recess 21 is filled with the filler material 4 (see Figure 1).
本実施形態の接合構造１によれば、杭頭部３１の平面形状が八角形状であるため、充填材４が多方向に分かれて凹部２１の内壁面と杭頭部３１の側面との隙間に流れ込むようになる。その結果、下側コンクリート部材の上部の平面形状を四角形状とした場合に比べて未充填箇所が形成され難い。 According to the joint structure 1 of this embodiment, since the planar shape of the pile head 31 is octagonal, the filler material 4 divides in multiple directions and flows into the gap between the inner wall surface of the recess 21 and the side surface of the pile head 31. As a result, it is less likely for unfilled areas to form compared to the case where the planar shape of the upper part of the lower concrete member is square.
本発明は、前述の実施形態に限られず、前記の各構成要素については、本発明の趣旨を逸脱しない範囲で、適宜変更が可能である。
例えば、前記実施形態では、フーチング２と杭３とを接合する場合について説明したが、本発明の接合構造１の施工対象物は杭基礎構造に限定されるものではなく、他のコンクリート部材同士の接合構造にも適用可能である。例えば、プレキャスト部材を利用した柱の施工における、プレキャスト製の柱部材同士の接合に使用してもよい。
また、前記実施形態では、注入孔２２および空気孔２３をフーチング２の側面から凹部２１に至るように形成したが、注入孔２２および空気孔２３は、フーチング２の上面から凹部２１に至るように形成されていてもよい。
上部コンクリートの凹部２１に挿入される下部コンクリート部材の凸部は、キャップ部材に限定されるものではなく、下部コンクリート部材の上面に形成された突起であってもよい。
キャップ部材３２は、必要に応じて設ければよい。また、キャップ部材３２の下面には、必ずしも円錐台状の窪みが形成されている必要はなく、例えば、柱状の窪みであってもよい。
杭頭部３１（キャップ部材３２）の平面形状は、五つ以上の角部を有する多角形状であれば限定されるものではなく、八角形状に限定されるものではない。
The present invention is not limited to the embodiments described above, and each of the above-described components can be modified as appropriate without departing from the spirit of the present invention.
For example, although the above embodiment described the case of joining a footing 2 and a pile 3, the object to which the joint structure 1 of the present invention can be constructed is not limited to pile foundation structures, but can also be applied to joint structures between other concrete members. For example, it may be used to join precast column members in the construction of columns using precast members.
Furthermore, in the above embodiment, the injection holes 22 and air holes 23 were formed so as to extend from the side surface of the footing 2 to the recess 21, but the injection holes 22 and air holes 23 may also be formed so as to extend from the top surface of the footing 2 to the recess 21.
The protrusion of the lower concrete member that is inserted into the recess 21 of the upper concrete is not limited to a cap member, but may also be a projection formed on the upper surface of the lower concrete member.
The cap member 32 may be provided as needed. Furthermore, the lower surface of the cap member 32 does not necessarily need to have a frustoconical recess; for example, a columnar recess may be formed.
The planar shape of the pile head 31 (cap member 32) is not limited to an octagonal shape, as long as it is a polygonal shape having five or more corners.
１ 接合構造
２ フーチング（上部コンクリート部材）
２１ 凹部
２２ 注入孔
２３ 空気孔
３ 杭（下部コンクリート部材）
３１ 杭頭部（凸部）
３２ キャップ部材（凸部）
３３ 領域
４ 充填材
５ 床付け面
Ｃ 円
Ｇ 地盤
ＧＬ 地盤面
Ｌ 直線
Ｔ 溝（隙間）
1. Joint structure 2. Footing (upper concrete member)
21 Recess 22 Injection hole 23 Air hole 3 Pile (lower concrete member)
31. Pile head (protruding part)
32 Cap member (protruding part)
33 Area 4 Filling material 5 Floor surface C Circle G Ground GL Ground surface L Straight line T Groove (gap)
Claims (2)
前記上側コンクリート部材の下面に形成された凹部と、
前記上側コンクリート部材の側面または上面から前記凹部の中央部に至る注入孔と、
前記上側コンクリート部材の側面または上面から前記凹部に至る複数の空気孔と、
前記下側コンクリート部材の上部に形成された前記凹部に挿入される凸部と、
前記注入孔から前記凹部と前記凸部との隙間に充填される充填材と、を備え、
前記凸部が、平面視で五つ以上の角部を有する多角形状であり、
前記凹部が、前記凸部と同数の角部を有する多角形状であり、
前記空気孔が、前記凹部の各角部近傍において開口していることを特徴とする、接合構造。 A joining structure that connects an upper concrete member located on the upper side and a lower concrete member located on the lower side,
A recess formed on the lower surface of the upper concrete member,
An injection hole extending from the side or top surface of the upper concrete member to the center of the recess,
Multiple air holes extending from the side or top surface of the upper concrete member to the recess,
A protrusion is inserted into the recess formed on the upper part of the lower concrete member,
The system comprises a filler material that is filled into the gap between the recess and the protrusion through the injection hole,
The aforementioned protrusion is a polygonal shape having five or more corners in a plan view,
The recess has a polygonal shape with the same number of corners as the convex portion,
A joining structure characterized in that the air holes are open near each corner of the recess .
前記上側コンクリート部材の下面に形成された凹部と、
前記上側コンクリート部材の側面または上面から前記凹部の中央部に至る注入孔と、
前記上側コンクリート部材の側面または上面から前記凹部に至る複数の空気孔と、
前記下側コンクリート部材の上部に形成された前記凹部に挿入される凸部と、
前記注入孔から前記凹部と前記凸部との隙間に充填される充填材と、を備え、
前記凸部が、平面視で五つ以上の角部を有する多角形状であり、
前記凹部が平面視円形状であり、
前記空気孔が、前記凸部の上面の平面的な中心と前記凸部の各角部とを放射状に結ぶ線の延長線上で凹部内壁の円周との交点近傍に開口していることを特徴とする、接合構造。 A joining structure that connects an upper concrete member located on the upper side and a lower concrete member located on the lower side,
A recess formed on the lower surface of the upper concrete member,
An injection hole extending from the side or top surface of the upper concrete member to the center of the recess,
Multiple air holes extending from the side or top surface of the upper concrete member to the recess,
A protrusion is inserted into the recess formed on the upper part of the lower concrete member,
The system comprises a filler material that is filled into the gap between the recess and the protrusion through the injection hole,
The aforementioned protrusion is a polygonal shape having five or more corners in a plan view,
The recess is circular in shape when viewed from above.
A joining structure characterized in that the air vent opens near the intersection point of the extension of the line connecting the planar center of the upper surface of the protrusion and each corner of the protrusion with the circumference of the inner wall of the recess .
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| JP2000355975A (en) | 1999-06-17 | 2000-12-26 | Ando Corp | Precast composite column joining method |
| JP2005256546A (en) | 2004-03-15 | 2005-09-22 | Fujita Corp | Building basic structure and construction method |
| JP2016186154A (en) | 2015-03-27 | 2016-10-27 | 大成建設株式会社 | Pile foundation structure construction method, pile foundation structure and foundation members |
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| JP2019007192A (en) | 2017-06-22 | 2019-01-17 | 大和ハウス工業株式会社 | Joint structure of foundation pile and steel foundation beam and joint method of the same |
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| JPH0480424A (en) * | 1990-07-23 | 1992-03-13 | Asahi Chem Ind Co Ltd | Foundation construction of building |
| GB9117337D0 (en) * | 1991-08-10 | 1991-09-25 | Roxbury Ltd | Improvements in or relating to supports for building structures |
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| JP2000355975A (en) | 1999-06-17 | 2000-12-26 | Ando Corp | Precast composite column joining method |
| JP2005256546A (en) | 2004-03-15 | 2005-09-22 | Fujita Corp | Building basic structure and construction method |
| JP2016186154A (en) | 2015-03-27 | 2016-10-27 | 大成建設株式会社 | Pile foundation structure construction method, pile foundation structure and foundation members |
| JP2017057642A (en) | 2015-09-17 | 2017-03-23 | 株式会社竹中工務店 | Footing foundation structure |
| JP2019007192A (en) | 2017-06-22 | 2019-01-17 | 大和ハウス工業株式会社 | Joint structure of foundation pile and steel foundation beam and joint method of the same |
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