JP4778392B2 - Centrifugal reinforced concrete pile - Google Patents

Centrifugal reinforced concrete pile Download PDF

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JP4778392B2
JP4778392B2 JP2006289983A JP2006289983A JP4778392B2 JP 4778392 B2 JP4778392 B2 JP 4778392B2 JP 2006289983 A JP2006289983 A JP 2006289983A JP 2006289983 A JP2006289983 A JP 2006289983A JP 4778392 B2 JP4778392 B2 JP 4778392B2
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pile
straight
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pile portion
joint
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伸治 土田
満 小寺
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Nippon Concrete Industries Co Ltd
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Description

本発明は、ストレート杭部に節杭部が一体成形された遠心力鉄筋コンクリート杭に関するものである。   The present invention relates to a centrifugal reinforced concrete pile in which a node pile portion is integrally formed with a straight pile portion.

図４は、外径を同一に形成したストレート杭部11と、このストレート杭部11の同軸上に一体成形された根固め部固着用の節杭部12とを具備したコンクリート杭を示す。節杭部12は、軸部13と、この軸部13より大径に形成された節部14とを備えている（例えば、特許文献１、２、３参照）。   FIG. 4 shows a concrete pile including a straight pile portion 11 having the same outer diameter and a node pile portion 12 for fixing a root-solidifying portion integrally formed on the same axis of the straight pile portion 11. The node pile portion 12 includes a shaft portion 13 and a node portion 14 having a diameter larger than that of the shaft portion 13 (see, for example, Patent Documents 1, 2, and 3).

そして、地中の拡大掘削穴に供給されたセメントミルクと土壌とを混合攪拌したソイルセメントを、図５に示されるように節杭部12の周囲で塊状に固化させて、この節杭部12と一体の根固め部15を形成させることで、高支持力が得られるようにしている。   Then, the soil cement obtained by mixing and stirring the cement milk supplied to the underground expanded excavation hole and the soil is solidified into a lump around the joint pile portion 12 as shown in FIG. A high supporting force is obtained by forming the integral root-solidifying portion 15.

この種のコンクリート杭は、工法上または設計上、図４に（ａ）、（ｂ）、（ｃ）で示されるように３つのタイプに大別される。   This type of concrete pile is roughly classified into three types as shown in FIGS. 4 (a), (b), and (c) in terms of construction method or design.

図４（ａ）に示されたコンクリート杭は、節杭部12の軸部13の外径Ｄ1より節部14の外径Ｄ2が大径に形成され、節杭部12の軸部13の外径Ｄ1とストレート杭部11の外径Ｄ3とが同径に形成された軸径型である（例えば、特許文献１参照）。   In the concrete pile shown in FIG. 4A, the outer diameter D2 of the node portion 14 is larger than the outer diameter D1 of the shaft portion 13 of the node pile portion 12, and the outside of the shaft portion 13 of the node pile portion 12 is increased. This is a shaft diameter type in which the diameter D1 and the outer diameter D3 of the straight pile portion 11 are formed to the same diameter (for example, see Patent Document 1).

図４（ｂ）に示されたコンクリート杭は、節杭部12の軸部13の外径Ｄ1より節部14の外径Ｄ2が大径に形成され、ストレート杭部11の外径Ｄ3は節杭部12の軸部13の外径Ｄ1より大径であるが節部14の外径Ｄ2より小径に形成された中間径型である（例えば、特許文献２参照）。   In the concrete pile shown in FIG. 4 (b), the outer diameter D2 of the node 14 is larger than the outer diameter D1 of the shaft 13 of the node pile 12, and the outer diameter D3 of the straight pile 11 is a node. This is an intermediate-diameter mold that is larger than the outer diameter D1 of the shaft portion 13 of the pile portion 12 but smaller than the outer diameter D2 of the node portion 14 (see, for example, Patent Document 2).

図４（ｃ）に示されたコンクリート杭は、節杭部12の軸部13の外径Ｄ1より節部14の外径Ｄ2が大径に形成され、ストレート杭部11の外径Ｄ3はこの節部14の外径Ｄ2と同径に形成された拡大径型である（例えば、特許文献３参照）。   In the concrete pile shown in FIG. 4 (c), the outer diameter D2 of the node 14 is larger than the outer diameter D1 of the shaft 13 of the node pile 12, and the outer diameter D3 of the straight pile 11 is this node. It is an enlarged diameter type formed to have the same diameter as the outer diameter D2 of the portion 14 (see, for example, Patent Document 3).

これらのコンクリート杭は、従来は遠心力プレストレストコンクリート杭であり、図６に示されるように、一端の端面金物16と他端の端面金物17との間に配設されたＰＣ鋼材18に遠心成形時にプレストレス（引張力）を作用させ、このＰＣ鋼材18に沿ってストレート杭部11と節杭部12の内径をストレートに遠心成形することが一般的である。   These concrete piles are conventionally centrifugally prestressed concrete piles, and as shown in FIG. 6, centrifugally formed into a PC steel material 18 disposed between one end face metal 16 and the other end face metal 17. In some cases, prestress (tensile force) is sometimes applied and the inner diameters of the straight pile portion 11 and the nodal pile portion 12 are centrifugally formed along the PC steel material 18 in a straight line.

このため、図４（ｂ）に示された中間径型および図４（ｃ）に示された拡大径型では、ストレート杭部11の壁厚が厚くなることから、遠心成形時に一度のコントリート注入量ではカバーできず、遠心成形後にコントリート再注入の手間がかかる。また、ストレート杭部11の壁厚が厚いため、重く取扱が困難になるとともに、オートクレーブ養生で、ひび割れが入ることもある。   For this reason, in the intermediate diameter mold shown in FIG. 4 (b) and the enlarged diameter mold shown in FIG. 4 (c), the wall thickness of the straight pile portion 11 is increased. It cannot be covered by the injection amount, and it takes time to reinject the concrete after centrifugal molding. Moreover, since the wall thickness of the straight pile part 11 is thick, it is heavy and difficult to handle, and cracking may occur during autoclave curing.

これに対し、図７に示されるように、ストレート杭部11と節杭部12とを別々に遠心成形して、一方の端面金物16と他方の端面金物17とを突き合わせて溶接継手19により接続したコンクリート杭がある。これは、ストレート杭部11の壁厚が厚くなることを防止できるが、別々に遠心成形したストレート杭部11と節杭部12とを溶接するため、製作に手間がかかりコストアップが生じる。
特開２００１−２４８１５６号公報（第１頁） 特開２００３−９００３６号公報（第１頁） 特開２００４−３３２４号公報（第９頁、図６） On the other hand, as shown in FIG. 7, the straight pile portion 11 and the joint pile portion 12 are separately centrifugally formed, and one end surface hardware 16 and the other end surface hardware 17 are brought into contact with each other by a welded joint 19. There are concrete piles. This can prevent the wall thickness of the straight pile portion 11 from becoming thick, but since the straight pile portion 11 and the nodal pile portion 12 that have been separately centrifugally formed are welded, production takes time and costs increase.
JP 2001-248156 A (first page) JP 2003-90036 A (first page) Japanese Patent Laying-Open No. 2004-3324 (page 9, FIG. 6)

このように、図６に示される遠心力プレストレストコンクリート杭は、遠心成形後のコントリート再注入の手間がかかり、重く、オートクレーブ養生で、ひび割れが入る問題があり、また、図７に示されるコンクリート杭は、ストレート杭部11と節杭部12とを溶接継手19により接続する手間とコストアップが生じる問題がある。   As described above, the centrifugal prestressed concrete pile shown in FIG. 6 is troublesome to reinject the concrete after centrifugal forming, is heavy, has a problem of cracking due to autoclave curing, and the concrete shown in FIG. The pile has a problem that the straight pile portion 11 and the joint pile portion 12 are connected by the welded joint 19 and the cost is increased.

本発明は、このような点に鑑みなされたもので、従来の遠心力プレストレストコンクリート杭の問題点を解決した遠心力鉄筋コンクリート杭を提供することを目的とする。   This invention is made | formed in view of such a point, and it aims at providing the centrifugal reinforced concrete pile which solved the problem of the conventional centrifugal prestressed concrete pile.

請求項１に記載された発明は、外径を同一に形成したストレート杭部と、このストレート杭部の同軸上に一体成形され、軸部およびこの軸部より大径の節部を形成した根固め部固着用の節杭部と、ストレート杭部の内径部と節杭部の内径部との境界部に設けられた異径部成形用のリングプレートとを具備し、前記ストレート杭部の外径は、前記節杭部の軸部の外径より大径に形成され、前記ストレート杭部の内径は、前記節杭部の内径より大径に形成された遠心力鉄筋コンクリート杭である。   The invention described in claim 1 is a straight pile portion having the same outer diameter, and a root integrally formed on the same axis as the straight pile portion to form a shaft portion and a node portion having a larger diameter than the shaft portion. A knot pile portion for fixing the solidified portion, and a ring plate for forming different diameter portions provided at a boundary portion between the inner diameter portion of the straight pile portion and the inner diameter portion of the knot pile portion, and the outside of the straight pile portion The diameter is formed larger than the outer diameter of the shaft portion of the joint pile portion, and the inner diameter of the straight pile portion is a centrifugal reinforced concrete pile formed larger than the inner diameter of the joint pile portion.

請求項２に記載された発明は、請求項１記載の遠心力鉄筋コンクリート杭において、異径部成形用のリングプレートを介して、ストレート杭部の鉄筋篭と節杭部の鉄筋篭とが一体に設けられたものである。   The invention described in claim 2 is the centrifugal reinforced concrete pile according to claim 1, wherein the reinforcing bar rod of the straight pile portion and the reinforcing rod rod of the joint pile portion are integrated with each other through the ring plate for forming the different diameter portion. It is provided.

請求項３に記載された発明は、請求項２記載の遠心力鉄筋コンクリート杭におけるストレート杭部の鉄筋篭および節杭部の鉄筋篭が、異径位置に配筋された別体の異形棒鋼を有するものである。   The invention described in claim 3 has a separate deformed steel bar in which the reinforcing bar rod of the straight pile portion and the reinforcing rod rod of the joint pile portion in the centrifugal reinforced concrete pile according to claim 2 are arranged at different diameter positions. Is.

請求項１に記載された発明によれば、ストレート杭部の内径部と節杭部の内径部との境界部に設けられた異径部成形用のリングプレートによって、前記ストレート杭部の内径を、前記節杭部の内径より大径に形成できる遠心力鉄筋コンクリート杭であるから、ストレート杭部の外径が、節杭部の軸部の外径より大径に形成される場合であっても、ストレート杭部の壁厚が厚くなることを防止でき、遠心成形後のコントリート再注入、重量オーバによる取扱困難、養生でのひび割れ発生を防止できる。   According to the invention described in claim 1, the inner diameter of the straight pile portion is reduced by the ring plate for forming the different diameter portion provided at the boundary portion between the inner diameter portion of the straight pile portion and the inner diameter portion of the node pile portion. Since the centrifugal reinforced concrete pile can be formed larger than the inner diameter of the joint pile portion, even if the outer diameter of the straight pile portion is formed larger than the outer diameter of the shaft portion of the joint pile portion It is possible to prevent the wall thickness of the straight pile portion from becoming thicker, prevent re-injection of the concrete after centrifugal molding, difficulty in handling due to excessive weight, and generation of cracks during curing.

請求項２に記載された発明によれば、異径部成形用のリングプレートを介して一体に設けられたストレート杭部の鉄筋篭と節杭部の鉄筋篭とにより、ストレート杭部と節杭部とを一体に遠心成形できるので、これらを別々に遠心成形して溶接する場合の手間とコストアップを防止できる。   According to the invention described in claim 2, the straight pile portion and the joint pile are formed by the reinforcing bar rod of the straight pile portion and the reinforcing rod rod of the joint pile portion integrally provided through the ring plate for forming the different diameter portion. Since the parts can be integrally formed by centrifugal molding, it is possible to prevent labor and cost increase when these are separately centrifugally molded and welded.

請求項３に記載された発明によれば、ストレート杭部の鉄筋篭および節杭部の鉄筋篭が、異径位置に配筋された別体の異形棒鋼を有するので、異径部成形用のリングプレートに対する各異形棒鋼の取付を容易にできる。   According to the invention described in claim 3, since the reinforcing bar rod of the straight pile portion and the reinforcing rod rod of the joint pile portion have separate deformed bar steel bars arranged at different diameter positions, Each deformed steel bar can be easily attached to the ring plate.

以下、本発明を、図１および図２に示された一実施の形態、図３に示された他の実施の形態を参照しながら詳細に説明する。   Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS. 1 and 2 and another embodiment shown in FIG.

図１は、遠心力鉄筋コンクリート杭21を示し、外径を同一に形成したストレート杭部22の同軸上に、根固め部固着用の節杭部23が一体成形されている。この節杭部23は、軸部24と、この軸部24より大径に形成された節部25とを備えている。   FIG. 1 shows a centrifugally reinforced concrete pile 21, and a joint pile portion 23 for fixing a root fixing portion is integrally formed on the same axis of a straight pile portion 22 having the same outer diameter. The node pile portion 23 includes a shaft portion 24 and a node portion 25 having a diameter larger than that of the shaft portion 24.

前記ストレート杭部22の外径は、前記節杭部23の軸部24の外径より大径に形成され、ストレート杭部22の内径部26と節杭部23の内径部27との境界部には、異径部成形用のリングプレート28が設けられ、図２に示されるように前記ストレート杭部22の内径Ｄ22は、異径部成形用のリングプレート28を介して、前記節杭部23の内径Ｄ23より大径に形成されている。   The outer diameter of the straight pile portion 22 is formed larger than the outer diameter of the shaft portion 24 of the joint pile portion 23, and a boundary portion between the inner diameter portion 26 of the straight pile portion 22 and the inner diameter portion 27 of the joint pile portion 23. 2 is provided with a ring plate 28 for forming a different-diameter portion, and as shown in FIG. 2, the straight pile portion 22 has an inner diameter D22 via the ring plate 28 for forming a different-diameter portion. It is formed larger than the inner diameter D23 of 23.

図１に示されるように、一方の端面金具31と異径部成形用のリングプレート28との間には、ストレート杭部用の鉄筋篭32が設置され、他方の端面金具33と異径部成形用のリングプレート28との間には、節杭部用の鉄筋篭34が設置されている。   As shown in FIG. 1, a rebar bar 32 for a straight pile portion is installed between one end fitting 31 and a ring plate 28 for forming a different diameter portion, and the other end fitting 33 and a different diameter portion. Between the ring plate 28 for forming, a reinforcing bar 34 for a joint pile portion is installed.

ストレート杭部用の鉄筋篭32は、所定ピッチで大径円筒状に配筋された複数の異形棒鋼32aの外周に螺旋筋32bを巻付けるように装着して溶接したものであり、また、節杭部用の鉄筋篭34は、ストレート杭部22の鉄筋篭32に対して、内径側に別体の異形棒鋼34aを所定ピッチで小径円筒状に配筋し、これらの異形棒鋼34aの外周に上記螺旋筋32bと同様に一連の螺旋筋34bを巻付けるように装着して溶接したものである。   Reinforcing bar 32 for the straight pile part is attached and welded so that spiral bar 32b is wound around the outer periphery of a plurality of deformed bars 32a arranged in a large-diameter cylindrical shape at a predetermined pitch. Reinforcing bar rod 34 for the pile part is arranged in a small-diameter cylindrical shape with a different pitch on the inner diameter side with respect to the reinforcing bar rod 32 of the straight pile part 22, and on the outer periphery of these deformed bar bars 34a. Similar to the spiral muscle 32b, a series of spiral muscles 34b is mounted and welded.

ストレート杭部22の鉄筋篭32と節杭部23の鉄筋篭34は、異径位置に配筋された別体の異形棒鋼32a，34aを異径部成形用のリングプレート28により一体化し、さらにこれらの異形棒鋼32a，34aの外周に一連の螺旋筋32b，34bを巻着して溶接することにより、ストレート杭部22の鉄筋篭32と節杭部23の鉄筋篭34とが一体に設けられたものである。   The reinforcing bar 32 of the straight pile 22 and the reinforcing bar 34 of the joint pile 23 are formed by integrating separate deformed steel bars 32a, 34a arranged at different diameter positions with a ring plate 28 for forming different diameter parts. By winding and welding a series of spiral bars 32b, 34b around the outer periphery of these deformed bars 32a, 34a, the reinforcing bar 32 of the straight pile portion 22 and the reinforcing bar 34 of the node pile portion 23 are integrally provided. It is a thing.

異径部成形用のリングプレート28は、遠心成形時に遠心機の回転型枠内に設置されて、ストレート杭部22の内径部26と節杭部23の内径部27との境界部に段差を設けるものであるが、このリングプレート28を遠心機の回転型枠内に位置決めすることで、各鉄筋篭32，34を位置決めする機能も備え、ストレート杭部22および節杭部23の壁厚内に各鉄筋篭32，34が正確に位置決めされる。   The ring plate 28 for forming the different diameter portion is installed in the rotating mold of the centrifuge at the time of centrifugal molding, and a step is formed at the boundary between the inner diameter portion 26 of the straight pile portion 22 and the inner diameter portion 27 of the joint pile portion 23. The ring plate 28 is positioned within the rotating mold of the centrifuge, so that it also has the function of positioning the rebar rods 32 and 34, and within the wall thickness of the straight pile portion 22 and the nodal pile portion 23. Thus, the rebar bars 32 and 34 are positioned accurately.

すなわち、図２に示されるように、異径部成形用のリングプレート28の外径縁と内径縁とに沿って、それぞれ一定ピッチの棒鋼挿入穴35，36が穿設されているので、外径側の各棒鋼挿入穴35にストレート杭部22の各異形棒鋼32aが挿入されて位置決めされ、内径側の各棒鋼挿入穴36に節杭部23の各異形棒鋼34aが挿入されて位置決めされる。   That is, as shown in FIG. 2, the steel plate insertion holes 35 and 36 having a constant pitch are formed along the outer diameter edge and the inner diameter edge of the ring plate 28 for forming the different diameter portion. Each deformed steel bar 32a of the straight pile portion 22 is inserted and positioned in each radial steel bar insertion hole 35, and each deformed steel bar 34a of the joint pile portion 23 is inserted and positioned in each inner steel bar insertion hole 36. .

次に、この図１および図２に示された実施の形態の作用効果を説明する。   Next, the function and effect of the embodiment shown in FIGS. 1 and 2 will be described.

水平方向に回転軸が設置された遠心機の回転型枠（図示せず）内に、一連に接続された一方の端面金具31、ストレート杭部用の鉄筋篭32、異径部成形用のリングプレート28、節杭部用の鉄筋篭34および他方の端面金具33を、これらにプレストレスを与えることなく設置し、遠心機により回転型枠を回転させながら、この回転型枠内にコンクリート注入管（図示せず）によりコンクリートを投入して、遠心力で締め固める。   In a rotating mold (not shown) of a centrifuge with a rotating shaft installed in the horizontal direction, one end face metal fitting 31 connected in series, a rebar rod 32 for a straight pile part, a ring for forming a different diameter part The plate 28, the rebar bar 34 for the joint pile and the other end face metal fitting 33 are installed without prestressing them, and the concrete injection pipe is inserted into the rotary mold while rotating the rotary mold with a centrifuge. Put concrete in (not shown) and compact with centrifugal force.

このとき、ストレート杭部22の外径、節杭部23の外径および両外径間で漸次変化するテーパ部37の形状は、回転型枠により決定されるが、この回転型枠内へのコンクリート投入量を、異径部成形用のリングプレート28よりストレート杭部22側と、節杭部23側とでそれぞれ調整することで、ストレート杭部22の壁厚および節杭部23の壁厚をそれぞれ最適な壁厚に成形し、外径に合せて、ストレート杭部22の内径部26を、節杭部23の内径部27より大径に形成する。   At this time, the outer diameter of the straight pile portion 22, the outer diameter of the joint pile portion 23, and the shape of the tapered portion 37 that gradually changes between both outer diameters are determined by the rotary mold, The wall thickness of the straight pile portion 22 and the wall thickness of the joint pile portion 23 are adjusted by adjusting the concrete input amount on the straight pile portion 22 side and the nodal pile portion 23 side from the ring plate 28 for forming the different diameter portion, respectively. Are formed into an optimum wall thickness, and the inner diameter portion 26 of the straight pile portion 22 is formed to have a larger diameter than the inner diameter portion 27 of the joint pile portion 23 in accordance with the outer diameter.

このように、ストレート杭部22の内径部26と節杭部23の内径部27との境界部に設けられた異径部成形用のリングプレート28によって、前記ストレート杭部22の内径Ｄ22を、前記節杭部23の内径Ｄ23より大径に形成できる遠心力鉄筋コンクリート杭であるから、ストレート杭部22の外径が、節杭部23の軸部24の外径より大径に形成される場合であっても、ストレート杭部22の壁厚が厚くなることを防止でき、遠心成形後のコントリート再注入、重量オーバによる取扱困難、養生でのひび割れ発生を防止できる。   In this way, the inner diameter D22 of the straight pile portion 22 is reduced by the ring plate 28 for forming different diameter portions provided at the boundary portion between the inner diameter portion 26 of the straight pile portion 22 and the inner diameter portion 27 of the node pile portion 23. Since it is a centrifugal reinforced concrete pile that can be formed larger than the inner diameter D23 of the joint pile 23, the outer diameter of the straight pile 22 is formed larger than the outer diameter of the shaft 24 of the joint pile 23 Even so, it is possible to prevent the wall thickness of the straight pile portion 22 from being increased, and prevent re-injection of the concrete after centrifugal molding, difficulty in handling due to excessive weight, and occurrence of cracks during curing.

また、異径部成形用のリングプレート28を介して一体に設けられたストレート杭部22の鉄筋篭32と節杭部23の鉄筋篭34とにより、ストレート杭部22と節杭部23とを一体に遠心成形できるので、これらを図７のように別々に遠心成形して溶接する場合の手間とコストアップを防止できる。   Further, the straight pile portion 22 and the joint pile portion 23 are formed by the reinforcing rod 32 of the straight pile portion 22 and the reinforcing rod 34 of the joint pile portion 23 which are integrally provided through the ring plate 28 for forming different diameter portions. Since they can be integrally formed by centrifugal molding, it is possible to prevent labor and cost increase when these are separately centrifugally molded and welded as shown in FIG.

加えて、異径部成形用のリングプレート28を遠心機の回転型枠内に位置決めすることによって、ストレート杭部22および節杭部23の鉄筋篭32，34をそれぞれの壁厚内に正確に設置できる。   In addition, by positioning the ring plate 28 for forming the different-diameter portion in the rotating mold of the centrifuge, the rebar rods 32 and 34 of the straight pile portion 22 and the joint pile portion 23 are accurately placed within the respective wall thicknesses. Can be installed.

さらに、ストレート杭部22の鉄筋篭32および節杭部23の鉄筋篭34が、異径位置に配筋された別体の異形棒鋼32a，34aを有するので、異径部成形用のリングプレート28に対する各異形棒鋼32a，34aの取付を容易にできる。   Further, since the reinforcing bar 32 of the straight pile part 22 and the reinforcing bar 34 of the joint pile part 23 have separate deformed bar bars 32a and 34a arranged at different diameter positions, the ring plate 28 for forming the different diameter part It is possible to easily attach the deformed steel bars 32a and 34a to.

次に、図３は、本発明の他の実施の形態を示し、前記遠心力鉄筋コンクリート杭21におけるストレート杭部22の異形棒鋼32aと、節杭部23の異形棒鋼34aとを、同一の異形棒鋼により連続的に形成したもので、ストレート杭部22の異形棒鋼32aに対して節杭部23の異形棒鋼34aは折曲部38を介して内径側に折曲形成されている。異形棒鋼32aは、異径部成形用のリングプレート28の外周部に溶接などにより固定されている。この図３に示される実施の形態において、図１および図２に示された実施の形態と同様の部分には同一の符号を付して、その説明を省略する。   Next, FIG. 3 shows another embodiment of the present invention, in which the deformed steel bar 32a of the straight pile portion 22 and the deformed steel bar 34a of the joint pile portion 23 in the centrifugal reinforced concrete pile 21 are replaced with the same deformed steel bar. The deformed steel bar 34a of the joint pile 23 is bent to the inner diameter side via the bent part 38 with respect to the deformed steel bar 32a of the straight pile part 22. The deformed steel bar 32a is fixed to the outer peripheral portion of the ring plate 28 for forming the different diameter portion by welding or the like. In the embodiment shown in FIG. 3, the same parts as those in the embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted.

なお、本発明は、図４（ｂ）に示された中間径型と、図４（ｃ）に示された拡大径型とに利用可能である。   The present invention is applicable to the intermediate diameter mold shown in FIG. 4B and the enlarged diameter mold shown in FIG. 4C.

本発明に係る遠心力鉄筋コンクリート杭の一実施の形態を示す半断面図である。It is a half sectional view showing an embodiment of a centrifugal reinforced concrete pile according to the present invention. 同上コンクリート杭の要部断面図である。It is principal part sectional drawing of a concrete pile same as the above. 同上コンクリート杭の他の実施の形態を示す要部断面図である。It is principal part sectional drawing which shows other embodiment of a concrete pile same as the above. （ａ）は軸径型コンクリート杭、（ｂ）は中間径型コンクリート杭、（ｃ）は拡大径型コンクリート杭を示す説明図である。(A) is a shaft diameter type concrete pile, (b) is an intermediate diameter type concrete pile, (c) is explanatory drawing which shows an expanded diameter type concrete pile. 従来のコンクリート杭における根固め部を示す斜視断面図である。It is a perspective sectional view showing the root hardening part in the conventional concrete pile. 従来の遠心力プレストレストコンクリート杭を示す半断面図である。It is a half sectional view showing a conventional centrifugal prestressed concrete pile. 従来のストレート杭部と節杭部を溶接したコンクリート杭の断面図である。It is sectional drawing of the concrete pile which welded the conventional straight pile part and the node pile part.

符号の説明Explanation of symbols

22 ストレート杭部
23 節杭部
24 軸部
25 節部
26 内径部
27 内径部
28 リングプレート
32，34 鉄筋篭
32a，34a 異形棒鋼 22 Straight pile
23 Joint pile
24 Shaft
25 joints
26 Inner diameter
27 Inner diameter
28 Ring plate
32, 34 Steel bar
32a, 34a deformed steel bar

Claims (3)

外径を同一に形成したストレート杭部と、
このストレート杭部の同軸上に一体成形され、軸部およびこの軸部より大径の節部を形成した根固め部固着用の節杭部と、
ストレート杭部の内径部と節杭部の内径部との境界部に設けられた異径部成形用のリングプレートとを具備し、
前記ストレート杭部の外径は、前記節杭部の軸部の外径より大径に形成され、
前記ストレート杭部の内径は、前記節杭部の内径より大径に形成された
ことを特徴とする遠心力鉄筋コンクリート杭。 Straight piles with the same outer diameter,
The straight pile portion is integrally formed on the same axis, and the shaft portion and the node pile portion for fixing the root-fixed portion forming a node portion having a larger diameter than the shaft portion,
A ring plate for forming a different diameter portion provided at the boundary between the inner diameter portion of the straight pile portion and the inner diameter portion of the joint pile portion,
The outer diameter of the straight pile portion is formed larger than the outer diameter of the shaft portion of the joint pile portion,
Centrifugal reinforced concrete pile, wherein the straight pile portion has an inner diameter larger than an inner diameter of the joint pile portion. 異径部成形用のリングプレートを介して、ストレート杭部の鉄筋篭と節杭部の鉄筋篭とが一体に設けられた
ことを特徴とする請求項１記載の遠心力鉄筋コンクリート杭。 The centrifugal reinforced concrete pile according to claim 1, wherein the reinforcing bar rod of the straight pile portion and the reinforcing rod rod of the joint pile portion are provided integrally through a ring plate for forming the different diameter portion. ストレート杭部の鉄筋篭および節杭部の鉄筋篭は、異径位置に配筋された別体の異形棒鋼を有する
ことを特徴とする請求項２記載の遠心力鉄筋コンクリート杭。 The centrifugal reinforced concrete pile according to claim 2, wherein the reinforcing bar rod of the straight pile portion and the reinforcing rod rod of the joint pile portion have separate deformed bar steel bars arranged at different diameter positions.
JP2006289983A 2006-10-25 2006-10-25 Centrifugal reinforced concrete pile Active JP4778392B2 (en)

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