JP5986815B2

JP5986815B2 - Soil cement composite pile with core material and construction method thereof

Info

Publication number: JP5986815B2
Application number: JP2012134778A
Authority: JP
Inventors: 英明木村
Original assignee: 地研テクノ株式会社
Priority date: 2012-06-14
Filing date: 2012-06-14
Publication date: 2016-09-06
Anticipated expiration: 2032-06-14
Also published as: JP2013256841A

Description

本発明は、鋼管等の芯材を有するソイルセメント複合杭及びその施工方法に関するものである。 The present invention relates to a soil cement composite pile having a core material such as a steel pipe and a construction method thereof.

従来、ソイルセメント杭において、芯材の外周面に環状突出部を設けてソイルセメント柱との付着を高めるようにしたソイルセメント複合杭が知られている（例えば、特許文献１参照）。 Conventionally, in a soil cement pile, a soil cement composite pile is known in which an annular protrusion is provided on the outer peripheral surface of a core material to enhance adhesion with a soil cement pillar (see, for example, Patent Document 1).

また、ソイルセメント杭において、芯材の内周面に環状突出部を設けてソイルセメント柱との付着を高めるようにしたソイルセメント複合杭が知られている（例えば、特許文献２参照）。 Moreover, in the soil cement pile, the soil cement composite pile which provided the cyclic | annular protrusion part in the inner peripheral surface of the core material and improved adhesion with a soil cement pillar is known (for example, refer patent document 2).

特開２００９−１１４７４１号公報JP 2009-111471 A 特開２００７−１９１９９０号公報JP 2007-191990 A

ソイルセメント複合杭においては、芯材の外周側又は内周側に環状突出部を設けることにより、ソイルセメントと芯材との付着力を高めることができるが、その付着力をより高めることができれば、さらに高い建物の支持ができるようになる。 In soil cement composite piles, by providing an annular protrusion on the outer peripheral side or inner peripheral side of the core material, the adhesive force between the soil cement and the core material can be increased, but if the adhesive force can be further increased It will be possible to support higher buildings.

そこで本発明は、上述した問題点に鑑みて案出されたものであり、その目的とするところは、ソイルセメントと芯材との付着力をより高めた芯材を有するソイルセメント複合杭及びその施工方法を提供することにある。 Therefore, the present invention has been devised in view of the above-mentioned problems, and the object of the present invention is a soil cement composite pile having a core material with a higher adhesion between the soil cement and the core material, and its It is to provide a construction method.

請求項１に記載の芯材を有するソイルセメント複合杭は、ソイルセンメント杭における芯材の外周面に環状突出部を有するソイルセメント杭において、芯材の外径よりも内径が大きく、かつ前記環状突出部の外径よりも外径の大きい環状リングが、前記芯材の外側に遊嵌させた状態で、かつ前記環状突出部に係合させてソイルセメント柱に埋め込み固定されていることを特徴とする。 The soil cement composite pile having the core material according to claim 1 is a soil cement pile having an annular protrusion on the outer peripheral surface of the core material in the soil cement pile, and the inner diameter is larger than the outer diameter of the core material, and An annular ring having an outer diameter larger than the outer diameter of the annular protrusion is loosely fitted to the outside of the core member, and is engaged and fixed to the soil cement pillar by engaging with the annular protrusion. Features.

請求項２に記載の芯材を有するソイルセメント複合杭は、ソイルセンメント杭における芯材の内周面に環状突出部を有するソイルセメント杭において、芯材の内径よりも外径が小さく、かつ前記環状突出部の内径よりも内径の小さい環状リングが、前記芯材の内側に遊嵌させた状態で、かつ前記環状突出部に係合させてソイルセメント柱に埋め込み固定されていることを特徴とする。 The soil cement composite pile having the core material according to claim 2, wherein the soil cement pile having an annular protrusion on the inner peripheral surface of the core material in the soil cement pile has an outer diameter smaller than the inner diameter of the core material, and An annular ring having an inner diameter smaller than the inner diameter of the annular projecting portion is loosely fitted inside the core member, and is engaged with the annular projecting portion and embedded and fixed to a soil cement column. And

請求項３に記載の芯材を有するソイルセメント複合杭は、請求項１に記載の芯材を有するソイルセメント複合杭において、芯材の内径よりも外径が小さく、かつ前記環状突出部の内径よりも内径の小さい環状リングが、前記芯材の内側に遊嵌させた状態で、かつ前記環状突出部に係合させてソイルセメント柱に埋め込み固定されていることを特徴とする。 The soil cement composite pile having the core material according to claim 3 is the soil cement composite pile having the core material according to claim 1, wherein the outer diameter is smaller than the inner diameter of the core material, and the inner diameter of the annular projecting portion An annular ring having a smaller inner diameter is loosely fitted inside the core member, and is engaged and fixed to a soil cement column by engaging with the annular projecting portion.

請求項４に記載の芯材を有するソイルセメント複合杭は、請求項１〜３のうち何れか１項に記載の芯材を有するソイルセメント複合杭において、前記環状リングは、環状突出部の下側に配置されていることを特徴とする。 The soil cement composite pile having the core material according to claim 4 is the soil cement composite pile having the core material according to any one of claims 1 to 3, wherein the annular ring is below the annular protrusion. It is arranged on the side.

請求項５に記載の芯材を有するソイルセメント複合杭は、請求項１〜３のうち何れか１項に記載の芯材を有するソイルセメント複合杭において、前記環状リングは、環状突出部の上側に配置されていることを特徴とする。 The soil cement composite pile having the core material according to claim 5 is the soil cement composite pile having the core material according to any one of claims 1 to 3, wherein the annular ring is located above the annular protrusion. It is characterized by being arranged in.

請求項６に記載の芯材を有するソイルセメント複合杭は、請求項１〜３のうち何れか１項に記載の芯材を有するソイルセメント複合杭において、前記環状リングは、上下の環状突出部の間で拘束されるように配置されていることを特徴とする。 The soil cement composite pile having the core material according to claim 6 is the soil cement composite pile having the core material according to any one of claims 1 to 3, wherein the annular ring includes upper and lower annular protrusions. It is arrange | positioned so that it may be restrained between.

請求項７に記載の芯材を有するソイルセメント複合杭は、請求項１〜６のうち何れか１項に記載の芯材を有するソイルセメント複合杭において、芯材の上端部に水平板体が設けられていることを特徴とする。 The soil cement composite pile having the core material according to claim 7 is the soil cement composite pile having the core material according to any one of claims 1 to 6, wherein a horizontal plate body is provided at an upper end portion of the core material. It is provided.

請求項８に記載の芯材を有するソイルセメント複合杭の施工方法は、ソイルセンメント杭における芯材の外周面に環状突出部を有するソイルセメント杭の施工方法において、芯材の外径よりも内径が大きく、かつ前記環状突出部の外径よりも外径の大きい環状リングを、前記芯材の外側に遊嵌させた状態で、前記芯材を固化前のソイルセメント柱内に押し込むことにより、前記環状リングを前記環状突出部に係合させて、ソイルセメント柱に埋め込み固定することを特徴とする。 The construction method of a soil cement composite pile having a core material according to claim 8 is a construction method of a soil cement pile having an annular protrusion on an outer peripheral surface of a core material in a soil cement pile, than the outer diameter of the core material. By pushing the core material into the soil cement pillar before solidification in a state where an annular ring having a large inner diameter and an outer diameter larger than the outer diameter of the annular protrusion is loosely fitted to the outside of the core material The annular ring is engaged with the annular projecting portion and embedded and fixed to a soil cement pillar.

請求項９に記載の芯材を有するソイルセメント複合杭の施工方法は、ソイルセンメント杭における芯材の内周面に環状突出部を有するソイルセメント杭の施工方法において、芯材の内径よりも外径が小さく、かつ前記環状突出部の内径よりも内径の小さい環状リングを、前記芯材の内側に遊嵌させた状態で、前記芯材を固化前のソイルセメント柱に押し込むことにより、前記環状リングを前記環状突出部に係合させて、ソイルセメント柱に埋め込み固定することを特徴とする。 The construction method of the soil cement composite pile having the core material according to claim 9 is a construction method of the soil cement pile having an annular protrusion on the inner peripheral surface of the core material in the soil sent pile, than the inner diameter of the core material. An annular ring having a small outer diameter and an inner diameter smaller than the inner diameter of the annular projecting portion is loosely fitted inside the core material, and the core material is pushed into a soil cement column before solidification, An annular ring is engaged with the annular protrusion, and is embedded and fixed in a soil cement pillar.

請求項１０に記載の芯材を有するソイルセメント複合杭の施工方法は、請求項８又９に記載の芯材を有するソイルセメント複合杭の施工方法において、環状リングを芯材の長手方向に移動させて、環状リングを環状突出部に係合させることを特徴とする。 The construction method of the soil cement composite pile having the core material according to claim 10 is the construction method of the soil cement composite pile having the core material according to claim 8 or 9, wherein the annular ring is moved in the longitudinal direction of the core material. The annular ring is engaged with the annular protrusion.

請求項１１に記載の芯材を有するソイルセメント複合杭の施工方法は、請求項８〜１０のうち何れか１項記載の芯材を有するソイルセメント複合杭の施工方法において、上端部に水平板体を設けている芯材が用いられていることを特徴とする。 The construction method of a soil cement composite pile having a core material according to claim 11 is the construction method of a soil cement composite pile having a core material according to any one of claims 8 to 10, wherein a horizontal plate is disposed at an upper end portion. A core material provided with a body is used.

本発明によると、芯材に設けられた環状突出部に係合する環状リングを芯材に対して遊嵌状態で設けるだけで、従来の芯材を用いたソイルセメント複合杭の場合より、ソイルセメントと芯材との付着力を格段に高めたソイルセメント複合杭とすることができ、施工も容易である等の効果が得られる。また、上端部に水平板体を設けている芯材が用いられていると、芯材を有するソイルセメント複合杭が完成した後においては、上部からの荷重をより効率良くソイルセメント柱及び芯材に分担させ、さらに支持力を増加させるための、載荷板又は受圧板として機能させることができる。また、ソイルセメント柱の硬化前においては、前記水平板体がソイルセメントに支持されることで、芯材がソイルセメント柱の下方に降下することを防止できるため、芯材の抜け落ち（降下）を防止する抜け落ち（降下）防止板として機能させることもできる。 According to the present invention, it is possible to provide a soil cement composite pile using a conventional core material by simply providing an annular ring that engages with an annular protrusion provided on the core material in a loosely fitted state. It is possible to obtain a soil-cement composite pile in which the adhesive strength between the cement and the core material is significantly increased, and effects such as easy construction can be obtained. In addition, when a core material provided with a horizontal plate at the upper end is used, after the soil cement composite pile having the core material is completed, the load from the upper part is more efficiently applied to the soil cement pillar and the core material. And can function as a loading plate or a pressure receiving plate for further increasing the supporting force. Further, before the soil cement pillar is hardened, the horizontal plate body is supported by the soil cement, so that the core material can be prevented from falling below the soil cement pillar, so that the core material is not dropped (lowered). It can also function as a fall-off (descent) prevention plate to prevent.

（ａ）は本発明の第１実施形態の芯材を有するソイルセメント複合杭を示す一部縦断正面図、（ｂ）は（ａ）のａ−ａ線断面図、（ｃ）は（ａ）の一部を拡大して示す縦断正面図、（ｄ）は芯材にガイドを設けた形態を示す一部縦断正面図である。(A) is a partially longitudinal front view showing a soil cement composite pile having a core material according to the first embodiment of the present invention, (b) is a sectional view taken along the line aa of (a), and (c) is (a). FIG. 3D is a partially longitudinal front view showing a form in which a guide is provided on the core material. （ａ）は本発明の第２実施形態の芯材を有するソイルセメント複合杭を示す一部縦断正面図、（ｂ）は（ａ）のｂ−ｂ線断面図、（ｃ）は（ａ）の一部を拡大して示す縦断正面図、（ｄ）は芯材にガイドを設けた形態を示す一部縦断正面図である。(A) is a partially longitudinal front view showing a soil cement composite pile having a core material according to the second embodiment of the present invention, (b) is a cross-sectional view taken along line bb of (a), and (c) is (a). FIG. 3D is a partially longitudinal front view showing a form in which a guide is provided on the core material. （ａ）は本発明の第３実施形態の芯材を有するソイルセメント複合杭を示す一部縦断正面図、（ｂ）は（ａ）のｃ−ｃ線断面図、（ｃ）は（ａ）の一部を拡大して示す縦断正面図である。(A) is a partially longitudinal front view showing a soil cement composite pile having a core material according to the third embodiment of the present invention, (b) is a sectional view taken along the line cc of (a), and (c) is (a). It is a vertical front view which expands and shows a part of. （ａ）は本発明の第４実施形態の芯材を有するソイルセメント複合杭を示す一部縦断正面図、（ｂ）は（ａ）のｄ−ｄ線断面図、（ｃ）は（ａ）の一部を拡大して示す縦断正面図である。(A) is a partially longitudinal front view showing a soil cement composite pile having a core material according to the fourth embodiment of the present invention, (b) is a sectional view taken along the line dd of (a), and (c) is (a). It is a vertical front view which expands and shows a part of. （ａ）は本発明の第５実施形態の芯材を有するソイルセメント複合杭を示す一部縦断正面図、（ｂ）は（ａ）のｅ−ｅ線断面図、（ｃ）は（ａ）の一部を拡大して示す縦断正面図である。(A) is a partially longitudinal front view showing a soil cement composite pile having a core material according to a fifth embodiment of the present invention, (b) is a sectional view taken along line ee of (a), and (c) is (a). It is a vertical front view which expands and shows a part of. （ａ）（ｂ）は環状突出部の他の形態と、環状リングとの関係を示す縦断正面図である。(A) (b) is a vertical front view which shows the relationship between the other form of an annular protrusion, and an annular ring. （ａ）は本発明の第６実施形態の芯材を有するソイルセメント複合杭を示す一部縦断正面図、（ｂ）は（ａ）のｆ−ｆ線断面図、（ｃ）は（ａ）の一部を拡大して示す縦断正面図である。(A) is a partially longitudinal front view showing a soil cement composite pile having a core material of a sixth embodiment of the present invention, (b) is a sectional view taken along line ff of (a), and (c) is (a). It is a vertical front view which expands and shows a part of. （ａ）は本発明の第７実施形態の芯材を有するソイルセメント複合杭を示す一部縦断正面図、（ｂ）は（ａ）のｇ−ｇ線断面図、（ｃ）は（ａ）の一部を拡大して示す縦断正面図である。(A) is a partially longitudinal front view showing a soil cement composite pile having a core material according to the seventh embodiment of the present invention, (b) is a sectional view taken along the line gg of (a), and (c) is (a). It is a vertical front view which expands and shows a part of. （ａ）は本発明の第８実施形態の芯材を有するソイルセメント複合杭を示す一部縦断正面図、（ｂ）は（ａ）のｈ−ｈ線断面図、（ｃ）は（ａ）の一部を拡大して示す縦断正面図である。(A) is a partially longitudinal front view showing a soil cement composite pile having a core material according to the eighth embodiment of the present invention, (b) is a cross-sectional view taken along the line hh of (a), and (c) is (a). It is a vertical front view which expands and shows a part of.

次に、本発明を図示の実施形態に基づいて詳細に説明する。 Next, the present invention will be described in detail based on the illustrated embodiment.

図１には、本発明の第１実施形態の芯材を有するソイルセメント複合杭１が示されている。図示の形態では、鋼管からなる芯材２の外周面３に、間隔をおいて一つ又は複数（図示の場合）の環状鉄筋が溶接により固定されて、芯材２の軸方向に間隔をおいて一つ又は複数の環状突出部４が形成されている。 FIG. 1 shows a soil cement composite pile 1 having a core material according to the first embodiment of the present invention. In the illustrated embodiment, one or more (in the illustrated case) annular reinforcing bars are fixed to the outer peripheral surface 3 of the core member 2 made of steel pipe by welding so as to be spaced apart in the axial direction of the core member 2. And one or a plurality of annular protrusions 4 are formed.

そして、各環状突出部４の下側には、芯材２の外径よりも内径が大きく、かつ環状突出部４の外径よりも外径の大きい、鉄筋又は鋼板からなる環状リング５が、芯材２の外側に遊嵌した状態で環状突出部４に係合されている。芯材２と環状リング５との間には、水平方向でギャップＧが形成されている。環状リング５は、芯材２に固定された（又は後記の実施形態のように芯材２に一体に形成された）環状突出部４間に配置する場合には、一部切り欠きリング状とした環状リング素材を芯材２に嵌合して、一部切り欠きの環状リング素材の両端を半径方向に溶接、又は一部切り欠きの環状リング素材の両端を周方向に重ねる場合には重ねた部分を周方向に溶接等により固定することで、環状リング５として配置することができる。芯材２に鉄筋等を固定することで、環状突出部４を形成する場合には、芯材２の長手方向に、環状リング５と環状突出部４とを交互に溶接により固着することで、配設することができる。 And on the lower side of each annular projecting portion 4, an annular ring 5 made of a reinforcing bar or a steel plate having an inner diameter larger than the outer diameter of the core member 2 and an outer diameter larger than the outer diameter of the annular projecting portion 4, The ring-shaped protrusion 4 is engaged with the core member 2 in a loosely fitted state. A gap G is formed in the horizontal direction between the core material 2 and the annular ring 5. When the annular ring 5 is disposed between the annular protrusions 4 fixed to the core member 2 (or formed integrally with the core member 2 as in the embodiment described later), the annular ring 5 has a partially cut ring shape. If the annular ring material is fitted to the core material 2 and both ends of the partially cut annular ring material are welded in the radial direction, or both ends of the partially cut annular ring material are overlapped in the circumferential direction By fixing the part in the circumferential direction by welding or the like, it can be arranged as an annular ring 5. When the annular protrusion 4 is formed by fixing a reinforcing bar or the like to the core material 2, by fixing the annular ring 5 and the annular protrusion 4 alternately by welding in the longitudinal direction of the core material 2, It can be arranged.

芯材２の先端部側に配置されている先端部の環状リング５については、芯材２に固定されていなくてもよい。先端部の環状リング５を、これを支持できる程度の粘性のある又は硬化養生されたソイルセメント柱６の表面に載置した後、先端部に環状突出部４を有する芯材２をソイルセメント柱６上の前記環状リング５内に挿入するように圧入することで、下端側の環状リング５を、下端側の環状突出部４に芯材２の長手方向に移動させて、ソイルセメント柱６内に配設することができる。また、他の環状リング５は、芯材２の挿入前においては、下降して下位の環状突出部４の上に支持されるように移動しているが、芯材２をソイルセメント柱６内に挿入することで、図１（ａ）に２点鎖線及び矢印Ａで示すように環状リング５を芯材２の長手方向の上位のレベルに相対的に上昇移動させて、環状突出部４の下側に係合するように上昇移動させることができる。なお、芯材２をソイルセメント柱６内に圧入する時には、先端部にＬ形フック部を有する棒状金具（図示省略）を用いて、環状突出部４の下側に環状リング５を誘導するようにしてもよい。なお、前記ソイルセメント柱６は、例えば、原位置土とセメントミルクを混合して造成されたソイルセメント柱、又は縦溝１２内に流動状態のソイルセメントを充填されたソイルセメント柱である。 The annular ring 5 at the distal end disposed on the distal end side of the core material 2 may not be fixed to the core material 2. After the annular ring 5 at the tip is placed on the surface of a soil cement column 6 that is viscous or hardened to support the ring 5, the core material 2 having the annular protrusion 4 at the tip is attached to the soil cement column. In the soil cement pillar 6, the annular ring 5 on the lower end side is moved in the longitudinal direction of the core member 2 to the annular projecting portion 4 on the lower end side by being press-fitted so as to be inserted into the annular ring 5 on the upper side 6. Can be arranged. In addition, the other annular ring 5 is moved down so as to be supported on the lower annular protrusion 4 before the core material 2 is inserted. As shown in FIG. 1A by the two-dot chain line and the arrow A, the annular ring 5 is relatively moved upward to the upper level in the longitudinal direction of the core member 2 to It can be moved upward to engage the lower side. When the core material 2 is press-fitted into the soil cement pillar 6, the annular ring 5 is guided to the lower side of the annular protrusion 4 by using a rod-shaped metal fitting (not shown) having an L-shaped hook at the tip. It may be. The soil cement column 6 is, for example, a soil cement column formed by mixing in-situ soil and cement milk, or a soil cement column in which the vertical groove 12 is filled with a fluid state soil cement.

なお、図１（ｄ）に示すように、環状突出部４の下側において、芯材２の外周面３に、環状リング５の内径よりも小さくなるように、三角形等の鋼片からなるガイド部材９を周方向に、間隔をおいて又は連続して設け、ガイド部材９のガイド斜面９ａにより、環状リング５を芯材２とほぼ同心状となるようにガイドするようにしてもよい。このようにすると、芯材２の外側における環状リング５の偏心配置が防止される。 In addition, as shown in FIG.1 (d), the guide which consists of steel pieces, such as a triangle, so that it may become smaller than the internal diameter of the annular ring 5 in the outer peripheral surface 3 of the core material 2 on the lower side of the annular protrusion part 4. FIG. The member 9 may be provided in the circumferential direction at intervals or continuously, and the annular ring 5 may be guided by the guide inclined surface 9 a of the guide member 9 so as to be substantially concentric with the core member 2. If it does in this way, eccentric arrangement of annular ring 5 in the outside of core material 2 will be prevented.

本発明の第１実施形態では、ソイルセメント柱６内に芯材２を配設して、ソイルセメント７を養生硬化させて、環状突出部４の下側に環状リング５を有する芯材２とソイルセメント柱６を一体化した、ソイルセメント複合杭１を築造する。このようなソイルセメント複合杭１では、ソイルセメント複合杭１の上側から作用する荷重を環状突出部４から環状リング５を介してソイルセメント７に伝達させることができ、周囲地盤１１に伝達させることができ、また逆に、ソイルセメント７から環状リング５及び環状突出部４を介して芯材２に荷重を伝達ことができる。 In the first embodiment of the present invention, the core material 2 is disposed in the soil cement pillar 6, the soil cement 7 is cured and cured, and the core material 2 having the annular ring 5 below the annular protrusion 4 is provided. The soil cement composite pile 1 in which the soil cement pillars 6 are integrated is constructed. In such a soil cement composite pile 1, a load acting from the upper side of the soil cement composite pile 1 can be transmitted from the annular protrusion 4 to the soil cement 7 via the annular ring 5 and transmitted to the surrounding ground 11. Conversely, a load can be transmitted from the soil cement 7 to the core member 2 via the annular ring 5 and the annular protrusion 4.

図２には、本発明の第２実施形態の芯材を有するソイルセメント複合杭１が示されている。この形態と第１実施形態と相違している部分は、この形態では、環状突出部４の上側に、鉄筋を環状に形成された環状リング５が配置されている形態とされている点で第１実施形態と相違している。それ以外の部分は、第１実施形態と同様であるので、同様な部分については同様な符号を付している。このような形態では、中間部及び下端部の環状リング５では、ソイルセメント７の粘性が低い場合で、環状リング５がその自重により自然降下を期待できるような場合で、引抜き力が卓越するような場所の複合杭として利用することができる。なお、最上位の環状リング５は、地上側から芯材２に嵌め込んで押し込むことで、環状突出部４に係合させることができる。その他、最上位の環状リング５以外は、環状突出部４に溶接により固定した形態として、最上位の環状リング５を鋼材又は角材等の押し込み部材により地上側から押し込んで、環状突出部４に係合させるようにしてもよい。 FIG. 2 shows a soil cement composite pile 1 having a core material according to the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that, in this embodiment, an annular ring 5 in which a reinforcing bar is formed in an annular shape is arranged above the annular protrusion 4. This is different from the first embodiment. Since other parts are the same as those in the first embodiment, the same reference numerals are given to the same parts. In such a form, in the annular ring 5 at the middle part and the lower end part, when the viscosity of the soil cement 7 is low and the annular ring 5 can be expected to fall naturally due to its own weight, the pulling force seems to be excellent. It can be used as a composite pile in various places. The uppermost annular ring 5 can be engaged with the annular projecting portion 4 by being fitted into the core member 2 and pushed in from the ground side. Other than the uppermost annular ring 5, the uppermost annular ring 5 is pushed from the ground side by a pushing member such as a steel material or a square member so that the annular protruding portion 4 is fixed to the annular protruding portion 4 by welding. You may make it match.

なお、図２（ｄ）に示すように、環状突出部４の上側において、芯材２の外周面３に、環状リング５の内径よりも小さくなるように、三角形等の鋼片からなるガイド部材９を周方向に、間隔をおいて又は連続して設けて、ガイド部材９のガイド斜面９ａにより環状リング５を、芯材２とほぼ同心状となるようにガイドするようにしてもよい。このようにすると、芯材２の内側における環状リング５の偏心配置が防止される。 As shown in FIG. 2D, a guide member made of a steel piece such as a triangle on the outer peripheral surface 3 of the core member 2 on the upper side of the annular protrusion 4 so as to be smaller than the inner diameter of the annular ring 5. 9 may be provided in the circumferential direction at intervals or continuously, and the annular ring 5 may be guided by the guide slope 9 a of the guide member 9 so as to be substantially concentric with the core material 2. If it does in this way, eccentric arrangement of annular ring 5 inside core material 2 will be prevented.

図３には、本発明の第３実施形態の芯材を有するソイルセメント複合杭１が示されている。この形態と第１実施形態と相違している部分は、環状リング５の下側に、さらに環状突出部４を設けて、各上下の環状突出部４の間で各環状リング５の芯材２の長手方向の移動を拘束するようにした形態である。このような形態であると、環状リング５が、上下の環状突出部４に移動が拘束されて、所定の位置に各環状リング５を埋め込み配置することができる。 FIG. 3 shows a soil cement composite pile 1 having a core material according to a third embodiment of the present invention. The difference between this embodiment and the first embodiment is that an annular protrusion 4 is further provided on the lower side of the annular ring 5, and the core material 2 of each annular ring 5 between the upper and lower annular protrusions 4. It is the form which restrained the movement of the longitudinal direction. With such a configuration, the movement of the annular ring 5 is restricted by the upper and lower annular protrusions 4, and each annular ring 5 can be embedded and disposed at a predetermined position.

図４には、本発明の第４実施形態の芯材を有するソイルセメント複合杭１が示されている。この形態では、芯材２の内周面１０に鉄筋が溶接により固定されて、内向きに突出する環状突出部４が形成され、環状突出部４の下側に、芯材２の内径よりも外径が小さく、かつ環状突出部４の内径よりも内径の小さい環状リング５を、芯材２の内側に遊嵌した状態で、かつ環状突出部４に係合させてソイルセメント柱６に埋め込み固定したソイルセメント複合杭１とした形態である。図示の形態のソイルセメント複合杭１では、芯材２の下端部の内側に環状突出部４と環状リング５を配置した形態としているが、中間部及び上端部に、第１〜第３実施形態の環状突出部４と環状リング５を適用して、芯材２の内外に環状突出部４及び環状リング５を有するソイルセメント複合杭１としてもよい。下端部の環状リング５は、例えば、原位置土とセメントミルクを混合して造成中のソイルセメント柱６が、環状リング５を支持できる程度の粘性になった後に、最初にソイルセメント７の表面に載置して、芯材２内に下端部の環状リング５を挿入するようにして、芯材２を造成中のソイルセメント柱６内に圧入することで施工することができる。このような形態では、芯材２に作用する押し込み力が卓越するような場所のソイルセメント複合杭１に適用するようにしてもよい。 FIG. 4 shows a soil cement composite pile 1 having a core material according to a fourth embodiment of the present invention. In this embodiment, the reinforcing bars are fixed to the inner peripheral surface 10 of the core material 2 by welding to form an annular projecting portion 4 projecting inwardly, and below the annular projecting portion 4 than the inner diameter of the core material 2. An annular ring 5 having a small outer diameter and a smaller inner diameter than the inner diameter of the annular protrusion 4 is embedded in the soil cement pillar 6 by being engaged with the annular protrusion 4 while being loosely fitted inside the core member 2. This is a fixed soil cement composite pile 1. In the soil cement composite pile 1 of the form of illustration, although it has set it as the form which has arrange | positioned the cyclic | annular protrusion part 4 and the cyclic | annular ring 5 inside the lower end part of the core material 2, it is 1st-3rd embodiment in an intermediate part and an upper end part. It is good also as the soil-cement composite pile 1 which has the cyclic | annular protrusion part 4 and the cyclic | annular ring 5 of this, and has the cyclic | annular protrusion part 4 and the cyclic | annular ring 5 inside and outside the core material 2. FIG. The annular ring 5 at the lower end is, for example, the surface of the soil cement 7 first after the soil cement column 6 being formed by mixing in-situ soil and cement milk becomes viscous enough to support the annular ring 5. It can be constructed by inserting the core material 2 into the soil cement pillar 6 under construction so that the annular ring 5 at the lower end is inserted into the core material 2. In such a form, you may make it apply to the soil cement composite pile 1 of the place where the pushing force which acts on the core material 2 is outstanding.

図５には、本発明の第５実施形態の芯材を有するソイルセメント複合杭１が示されている。この形態では、芯材２の内側に内向きに突出する環状突出部４が形成され、環状突出部４の上側に、芯材２の内径よりも外径が小さく、かつ環状突出部４の内径よりも内径の小さい環状リング５を、芯材２の内側に遊嵌した状態で、かつ環状突出部４に係合させてソイルセメント柱６に埋め込み固定したソイルセメント複合杭１とした形態である。図示の形態のソイルセメント複合杭１では、芯材２の下端部の内側に環状突出部４と環状リング５を配置した形態としているが、中間部及び上端部に、第１〜第３実施形態の環状突出部４と環状リング５を適用して、芯材２の内外に環状突出部４及び環状リング５を有するソイルセメント複合杭１としてもよい。下端部の環状リング５は、例えば、原位置土とセメントミルクを混合して造成中のソイルセメント柱６が、環状リング５を降下できる程度の粘性時に、芯材２と共に造成直後のソイルセメント柱６内に挿入することで施工することができる。この場合には、芯材２を一次的に地上部の支持材（図示省略）により支持し他状態で養生硬化させる。このような形態では、芯材２に作用する引抜き力が卓越するような場所のソイルセメント複合杭１に適用するようにしてもよい。 FIG. 5 shows a soil cement composite pile 1 having a core material according to a fifth embodiment of the present invention. In this embodiment, an annular protrusion 4 that protrudes inwardly is formed inside the core member 2, and the outer diameter is smaller than the inner diameter of the core member 2 on the upper side of the annular protrusion 4 and the inner diameter of the annular protrusion 4. An annular ring 5 having an inner diameter smaller than that of the core material 2 is loosely fitted inside the core material 2 and is engaged with the annular projecting portion 4 so as to be embedded in the soil cement pillar 6 and fixed in a soil cement composite pile 1. . In the soil cement composite pile 1 of the form of illustration, although it has set it as the form which has arrange | positioned the cyclic | annular protrusion part 4 and the cyclic | annular ring 5 inside the lower end part of the core material 2, it is 1st-3rd embodiment in an intermediate part and an upper end part. It is good also as the soil-cement composite pile 1 which has the cyclic | annular protrusion part 4 and the cyclic | annular ring 5 of this, and has the cyclic | annular protrusion part 4 and the cyclic | annular ring 5 inside and outside the core material 2. FIG. The ring ring 5 at the lower end is, for example, a soil cement column immediately after being formed together with the core material 2 when the soil cement column 6 being mixed by mixing in-situ soil and cement milk is viscous enough to lower the ring 5. It can be constructed by inserting it into 6. In this case, the core material 2 is temporarily supported by a support material (not shown) on the ground and cured and cured in the other state. In such a form, you may make it apply to the soil cement composite pile 1 of the place where the extraction force which acts on the core material 2 is outstanding.

芯材２としては、断面円形鋼管以外にも、断面矩形鋼管等の芯材２を用いてもよく、芯材２の断面形態に合せて、矩形環状の環状突出部４及び矩形環状の環状リング５を用いるようにすればよい。従って、芯材２の断面形態に応じて、環状突出部４及び環状リング５を同心状等に形成するようにすればよい。 As the core material 2, a core material 2 such as a rectangular steel pipe may be used in addition to a circular steel pipe in cross section. A rectangular annular projecting portion 4 and a rectangular annular ring may be used in accordance with the cross-sectional shape of the core material 2. 5 may be used. Therefore, the annular protrusion 4 and the annular ring 5 may be formed concentrically according to the cross-sectional form of the core material 2.

図６は、環状突出部４及び環状リング５を形成する場合に、鉄筋に代えて、リング状の鋼板を用いてもよいことを示したものである。図６（ａ）の場合は、鋼管等の芯材２の外周面３にリング状の鋼板が溶接により固定されて、環状突出部４が形成され、その環状突出部４の下側に環状リング５を係合させている。また、図６（ｂ）の場合には、環状突出部４の上側に環状リング５を係合させている。図６で示しているのは、鉄筋から鋼板に代えた環状突出部４と環状リング５が芯材２の外側に配置させた場合であるが、その他の実施形態としては、鉄筋を鋼板に代えた環状突出部４と環状リング５を図４及び図５のように芯材２の内側に配置させたものであってもよい。なお、環状突出部４を形成する場合に、リング状の鉄筋又は鋼板の周方向に鉄筋端部相互又は鋼板端部相互に、重なり代を設けて、周方向の溶接長を長くして一体化するとよい。 FIG. 6 shows that when the annular protrusion 4 and the annular ring 5 are formed, a ring-shaped steel plate may be used in place of the reinforcing bars. In the case of FIG. 6A, a ring-shaped steel plate is fixed to the outer peripheral surface 3 of the core member 2 such as a steel pipe by welding to form an annular protrusion 4, and an annular ring is formed below the annular protrusion 4. 5 is engaged. In the case of FIG. 6B, the annular ring 5 is engaged with the upper side of the annular protrusion 4. FIG. 6 shows a case where the annular protrusion 4 and the annular ring 5 in place of the reinforcing bar instead of the steel plate are arranged on the outside of the core material 2, but in another embodiment, the reinforcing bar is replaced with a steel plate. The annular protrusion 4 and the annular ring 5 may be arranged inside the core member 2 as shown in FIGS. 4 and 5. When the annular protrusion 4 is formed, an overlap margin is provided in the circumferential direction of the ring-shaped reinforcing bar or steel plate, or between the steel plate ends, and the circumferential welding length is lengthened and integrated. Good.

図７及び図８には、本発明の第６及び第７実施形態の芯材を有するソイルセメント複合杭１が示されている。この形態では、環状突出部４を形成する場合に、芯材２自体の管壁を外側（図示の場合）又は内側（図示を省略）に張り出すように加工して、環状突出部４を形成するようにしてもよい。環状突出部４の断面形態は、図７に示すように、２等辺三角形等の断面山形、図８に示すように断面台形形態の環状突出部４としてもよく、そのような環状突出部４に、環状リング５を係合させるようにしてもよい。また、図示を省略するが、芯材２の内側に張り出す環状突出部４に係合するように環状リングを設ける形態のソイルセメント複合杭１としてもよい。 7 and 8 show a soil cement composite pile 1 having a core material according to sixth and seventh embodiments of the present invention. In this embodiment, when the annular protrusion 4 is formed, the annular protrusion 4 is formed by processing the tube wall of the core material 2 itself so as to project outward (in the case of illustration) or inward (not shown). You may make it do. The cross-sectional form of the annular projecting portion 4 may be a cross-sectional mountain shape such as an isosceles triangle as shown in FIG. 7, or an annular projecting portion 4 having a trapezoidal cross-sectional shape as shown in FIG. The annular ring 5 may be engaged. Moreover, although illustration is abbreviate | omitted, it is good also as the soil-cement composite pile 1 of the form which provides an annular ring so that it may engage with the cyclic | annular protrusion part 4 protruding inside the core material 2. FIG.

図９には、本発明の第８実施形態の芯材を有するソイルセメント複合杭１が示されている。この実施形態は、本発明を実施する場合に、芯材２の上端部に、鋼板等の水平板体１３を設け、水平板体１３をソイルセメント柱６の上面に浮かせるように配置してもよいことを示す代表形態である。図示の形態では、円形鋼板等の水平板体１３の下部に鋼製筒体等の筒体１４が一体に設けられ、筒体１４を芯材２の上端部に嵌合して、筒体１４の下端部等を溶接Ｗ（図示の場合）により芯材２に固定したり、又は図示を省略するが、芯材２と筒体１４とに渡ってボルトを挿通すると共にナットにより固定したりして設けられている。或いは図示を省略するが、筒体１４を備えた水平板体１３における筒体１４を、芯材２の外周面或いは内周面に圧入して固定するようにしてもよい。芯材２の上端部に水平板体１３を設けると、芯材を有するソイルセメント複合杭１が完成した後においては、上部からの荷重をより効率良くソイルセメント柱６及び芯材２に分担させ、さらに支持力を増加させるための、載荷板又は受圧板として機能させることができる。また、水平板体１３を芯材２に固定した場合で、ソイルセメント柱６の硬化前においては、水平板体１３がソイルセメント７に支持されることで、芯材２がソイルセメント柱６の下方に降下することを防止できるため、芯材２の抜け落ち（降下）を防止する抜け落ち（降下）防止板として機能させることもできる。また、筒体１４により、又はより筒体１４を芯材２の下方部に長く嵌合すること（載荷板又は受圧板としての水平板体１３の固定部を延長すること）で、結果的に、芯材２の上部（又は上端部）が、芯材２自体と筒体１４とによる２重構造となり、芯材２に水平力が生じた場合に、筒体１４を芯材２の補強部材として補強することができる等の効果もある。 FIG. 9 shows a soil cement composite pile 1 having a core material according to an eighth embodiment of the present invention. In this embodiment, when the present invention is carried out, a horizontal plate body 13 such as a steel plate is provided at the upper end portion of the core material 2, and the horizontal plate body 13 is arranged so as to float on the upper surface of the soil cement column 6. It is a representative form indicating that it is good. In the form shown in the figure, a cylindrical body 14 such as a steel cylindrical body is integrally provided at a lower portion of a horizontal plate body 13 such as a circular steel plate, and the cylindrical body 14 is fitted to the upper end portion of the core member 2. The lower end of the steel plate is fixed to the core material 2 by welding W (in the case of illustration), or although not shown, a bolt is inserted over the core material 2 and the cylindrical body 14 and fixed with a nut. Is provided. Or although illustration is abbreviate | omitted, you may make it press-fit and fix the cylinder 14 in the horizontal plate 13 provided with the cylinder 14 to the outer peripheral surface or inner peripheral surface of the core material 2. FIG. When the horizontal plate 13 is provided at the upper end portion of the core material 2, after the soil cement composite pile 1 having the core material is completed, the load from the upper part is more efficiently shared with the soil cement pillar 6 and the core material 2. Further, it can function as a loading plate or a pressure receiving plate for further increasing the supporting force. Further, when the horizontal plate 13 is fixed to the core material 2 and before the soil cement column 6 is hardened, the horizontal plate 13 is supported by the soil cement 7, so that the core material 2 is made of the soil cement column 6. Since it can be prevented from descending downward, it can also function as a drop-off (descent) prevention plate for preventing the core material 2 from dropping (falling). In addition, as a result of the cylindrical body 14 or by fitting the cylindrical body 14 to the lower portion of the core material 2 longer (extending the fixing portion of the horizontal plate body 13 as a loading plate or a pressure receiving plate), as a result The upper portion (or the upper end portion) of the core material 2 has a double structure composed of the core material 2 itself and the cylindrical body 14, and when a horizontal force is generated in the core material 2, the cylindrical body 14 is used as a reinforcing member for the core material 2. It can be reinforced as an effect.

図１〜３、７〜９等の実施形態では、環状リング５を間隔をおいて３枚設けているが、３枚に限定されることなく、１又は複数枚設ける形態としてもよく、また、本発明のソイルセメント複合杭１を設計又は施工する場合に、環状リング５を一つ備えることで上部からの荷重を十分に受け持つ場合には、複数の環状リング５を設けなくてもよい。なお、水平板体１３の外径は、ソイルセメント柱６の外径と同等又は小さい外径とされ、筒体１４を省略する場合には、芯材２に溶接により固定されている。 In the embodiment of FIGS. 1-3, 7-9, etc., three annular rings 5 are provided at intervals, but the present invention is not limited to three, and one or a plurality of annular rings 5 may be provided. When designing or constructing the soil cement composite pile 1 of the present invention, if a single annular ring 5 is provided to sufficiently handle the load from above, the plurality of annular rings 5 may not be provided. Note that the outer diameter of the horizontal plate 13 is equal to or smaller than the outer diameter of the soil cement column 6, and is fixed to the core member 2 by welding when the cylindrical body 14 is omitted.

本発明を実施する場合、芯材２の上部をソイルセメント柱６から突出させ、適宜鉄筋或いはフランジ等の接続部を芯材２の上部に設け、コンクリート製等の上部構造物と結合させるようにしてもよく、このようにすると、上部構造物に地震時等に水平力が作用した場合に、ソイルセメント柱６に支持力ばかりでなく、引抜き抵抗を発揮させることができる。 When practicing the present invention, the upper part of the core material 2 is protruded from the soil cement column 6 and a connecting part such as a reinforcing bar or a flange is appropriately provided on the upper part of the core material 2 so as to be coupled with an upper structure made of concrete or the like. In this case, when a horizontal force acts on the upper structure during an earthquake or the like, not only the supporting force but also the pulling resistance can be exerted on the soil cement column 6.

なお、本発明を実施する場合、深度の深いソイルセメント複合杭１とする場合に、複数の芯材２を直列に連結して、長尺の芯材２としてもよい。 In addition, when implementing this invention, when setting it as the soil cement composite pile 1 with a deep depth, it is good also as a long core material 2 by connecting the some core material 2 in series.

１ソイルセメント複合杭
２芯材
３外周面
４環状突出部
５環状リング
６ソイルセメント柱
７ソイルセメント
９ガイド部材
９ａガイド斜面
１０内周面
１１周囲地盤
１２縦溝
１３水平板体
１４筒体
Ａ矢印
Ｇギャップ
Ｗ溶接 DESCRIPTION OF SYMBOLS 1 Soil cement composite pile 2 Core material 3 Outer peripheral surface 4 Annular protrusion 5 Annular ring 6 Soil cement pillar 7 Soil cement 9 Guide member 9a Guide slope 10 Inner peripheral surface 11 Periphery ground 12 Vertical groove 13 Horizontal flat plate 14 Cylinder A Arrow G gap W welding

Claims

In soil cement piles having an annular protrusion on the outer circumferential surface of the core material in the soil Sen instrument piles, larger inner diameter than the outer diameter of the core material, and a large annular ring of outer diameter than the outer diameter of the annular protrusion, A soil cement composite pile having a core material, which is loosely fitted on the outer side of the core material, and is embedded and fixed in a soil cement column by engaging with the annular projecting portion.

In soil cement piles on the inner peripheral surface of the core material in the soil Sen instrument pile having an annular protrusion, smaller outer diameter than the inner diameter of the core material, and a small annular ring inner diameter than the inner diameter of the annular protrusion, the A soil cement composite pile having a core material that is loosely fitted inside the core material, and is embedded and fixed in a soil cement column by engaging with the annular protrusion.

An annular ring having an outer diameter smaller than the inner diameter of the core material and smaller than an inner diameter of the annular protrusion is loosely fitted inside the core material and is engaged with the annular protrusion. The soil cement composite pile having a core material according to claim 1, wherein the pile is fixed by being embedded in a soil cement pillar.

The said ring ring is arrange | positioned under the cyclic | annular protrusion part, The soil cement composite pile which has a core material of any one of Claims 1-3 characterized by the above-mentioned.

The said ring ring is arrange | positioned above the cyclic | annular protrusion part, The soil cement composite pile which has a core material in any one of Claims 1-3 characterized by the above-mentioned.

The soil ring composite pile having a core material according to any one of claims 1 to 3, wherein the annular ring is disposed so as to be constrained between upper and lower annular protrusions.

The soil-plate composite pile which has a core material in any one of Claims 1-6 by which the horizontal board is provided in the upper end part of the core material.

In a method for constructing a soil cement pile having an annular protrusion on an outer peripheral surface of a core material in a soil sente pile, an annular shape having an inner diameter larger than the outer diameter of the core material and an outer diameter larger than the outer diameter of the annular protrusion With the ring loosely fitted to the outside of the core material, the core material is pushed into the soil cement pillar before solidification, thereby engaging the annular ring with the annular protrusion, and forming the soil cement pillar. A method for constructing a soil cement composite pile having a core material characterized by being embedded and fixed.

In a method for constructing a soil cement pile having an annular protrusion on an inner peripheral surface of a core material in a soil sentiment pile, an annular ring having an outer diameter smaller than an inner diameter of the core material and smaller than an inner diameter of the annular protrusion Is inserted into the core material before being solidified, so that the annular ring is engaged with the annular projecting portion and fixed in the soil cement column. A method for constructing a soil cement composite pile having a core material.

The construction method for a soil cement composite pile having a core material according to claim 8 or 9, wherein the annular ring is moved in the longitudinal direction of the core material, and the annular ring is engaged with the annular protrusion.

The construction method of the soil cement composite pile which has a core material in any one of Claims 8-10, wherein the core material which provided the horizontal plate body in the upper end part is used.