JP2009057817A - Building method for composite friction pile - Google Patents

Building method for composite friction pile Download PDF

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JP2009057817A
JP2009057817A JP2008200799A JP2008200799A JP2009057817A JP 2009057817 A JP2009057817 A JP 2009057817A JP 2008200799 A JP2008200799 A JP 2008200799A JP 2008200799 A JP2008200799 A JP 2008200799A JP 2009057817 A JP2009057817 A JP 2009057817A
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pile
ready
friction pile
composite friction
diameter
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JP5136270B2 (en
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Hiroshi Wakiya
泰士 脇屋
Shunsuke Usami
俊輔 宇佐美
Kenji Kono
謙治 河野
Hisakazu Tachika
久和 田近
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JFE Steel Corp
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To build a composite friction pile of a large diameter without using a heavy machinery. <P>SOLUTION: In a method for building a composite friction pile, wherein the ground is excavated in a columnar shape and cement milk and the excavated soil are mixed for making a columnar body into which an existing pile as a core material is erected before the soil cement is hardened, the existing pile 2 has a larger diameter than the columnar body has. Furthermore, a plurality of the columnar bodies are connected to each other in such a way as to cover the whole circumference of the cross section of the existing pile, so as to build a composite friction pile 1a-1f. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、建屋等の構造物を支持する基礎部分に使用されるソイルセメントの柱状改良体と既製杭の芯材とからなる合成摩擦杭に関する。   The present invention relates to a composite friction pile including a columnar improved body of soil cement used for a foundation portion that supports a structure such as a building and a core material of a ready-made pile.

構造物を支持する基礎部分には、一般に杭基礎が用いられるが、良質の支持層がかなり深いところにあり、支持杭を根入れさせるのは不経済である場合に、周面摩擦によって荷重を支持する摩擦杭が使用される。
特許文献１には、杭径よりも若干大きめの孔を掘削し、掘削土砂とセメントミルクを攪拌混合し、造成されたソイルセメントの柱状体が硬化する前にその中に鋼管やコンクリート杭等の既製杭を建て込む合成摩擦杭の造成方法が記載されている。 A pile foundation is generally used for the foundation part that supports the structure, but when a good-quality support layer is located at a deep depth and it is uneconomical to incorporate the support pile, the load is applied by peripheral friction. Supporting friction piles are used.
In Patent Document 1, a hole slightly larger than the diameter of the pile is excavated, the excavated earth and cement milk are stirred and mixed, and before the formed soil cement columnar body is cured, a steel pipe, a concrete pile, etc. A method for creating a synthetic friction pile that builds ready-made piles is described.

図２において、１は地盤Ｇを柱状に掘削した掘削孔、３はその掘削孔内に造成されたソイルセメント柱状体、２はソイルセメント柱状体３の中に建て込まれた鋼管、Ｄはソイルセメント柱状体３の径、Ｌは長さ、ｆは周面摩擦力である。
しかしこのような合成摩擦杭は、一般に１個の掘削孔に１本の既製杭を建て込むことを前提としているから、柱状体内に貫入させようとする杭が大径であると掘削孔も大径となり、施工には大型機械が必要となる。
特開昭６２−２６８４２２号公報 In FIG. 2, 1 is a drilling hole obtained by excavating the ground G into a column shape, 3 is a soil cement columnar body formed in the drilling hole, 2 is a steel pipe built in the soil cement columnar body 3, D is a soil The diameter of the cement pillar 3, L is the length, and f is the circumferential frictional force.
However, such synthetic friction piles are generally based on the premise that one ready-made pile is built in one excavation hole. Therefore, if the pile to be penetrated into the columnar body has a large diameter, the excavation hole is large. A large machine is required for construction.
Japanese Patent Laid-Open No. 62-268422

本発明は、大型機械を使用することなく、大径の合成摩擦杭を造成することを目的とする。   An object of the present invention is to create a synthetic friction pile having a large diameter without using a large machine.

本発明は、地盤を柱状に掘削し、セメントミルクと掘削土砂とを攪拌してソイルセメントの柱状体を造成し、前記ソイルセメントが硬化しないうちにその中へ芯材として既製杭を建て込んでなる合成摩擦杭の造成方法において、前記既製杭が前記柱状体に対して大径のものであり、前記柱状体をこの既製杭の全周断面をカバーするように互いに接続させて複数個造成することを特徴とする合成摩擦杭の造成方法である。   The present invention excavates the ground into a columnar shape, stirs cement milk and excavated earth and sand to form a soil cement columnar body, and builds a ready-made pile as a core material into the soil cement before it hardens In the synthetic friction pile forming method, the ready-made piles have a large diameter with respect to the columnar body, and a plurality of the columnar bodies are connected to each other so as to cover the entire circumferential cross section of the ready-made pile. It is the construction method of the synthetic friction pile characterized by this.

本発明によれば、小型機械のみで大径杭による合成摩擦杭を造成することができるという、すぐれた効果を奏する。   According to the present invention, it is possible to produce a composite friction pile using a large-diameter pile with only a small machine.

本発明においては、貫入させようとする大径杭の全周断面をカバーするように、水平投影面の必要部分のみを掘削するので、一回の掘削面積は小さく、小型機械のみで施工が可能である。なお、掘削にあたっては掘削位置が動かないよう、固定翼を有する掘削ヘッドを使用することが望ましい。大径の既製杭を建て込む際には大径の把持具が必要ではあるが、特に大径に対応する力は必要ではないから、小型機械でそのまま施工できる。   In the present invention, only a necessary part of the horizontal projection surface is excavated so as to cover the entire circumferential cross section of the large-diameter pile to be penetrated, so that the excavation area is small and construction can be performed only with a small machine. It is. In excavation, it is desirable to use an excavation head having fixed wings so that the excavation position does not move. When building a large-diameter ready-made pile, a large-diameter gripping tool is required, but since a force corresponding to the large diameter is not particularly required, it can be applied as it is with a small machine.

図１は本発明における施工状況を示す平面図で、１ａ〜１ｆは掘削孔、２は既製杭である。個々の掘削孔の径をたとえば１ｍとして、（ａ）の例では３個の掘削孔１ａ〜１ｃにより約１ｍ径の既製杭２を建て込むことができる。（ｂ）では４個の掘削孔１ａ〜１ｄで1200ｍｍ径の杭が、また（ｃ）の例では6個の掘削孔１ａ〜１ｆによって２ｍ近い大径の既製杭を建て込むことができる。なお、（ｂ）、（ｃ）の例に見られるように、既製杭が実際には貫入しない中央部分などは、掘削しないで残してもかまわない。   FIG. 1 is a plan view showing a construction situation in the present invention, wherein 1a to 1f are excavation holes and 2 is a ready-made pile. Assuming that the diameter of each excavation hole is 1 m, for example, in the example of (a), the ready-made pile 2 having a diameter of about 1 m can be built by the three excavation holes 1a to 1c. In (b), a pile with a diameter of 1200 mm can be built with four excavation holes 1a to 1d, and in the example of (c), a large-diameter ready-made pile with a diameter of nearly 2 m can be built with six excavation holes 1a to 1f. In addition, as seen in the examples of (b) and (c), the central portion where the ready-made pile does not actually penetrate may be left without being excavated.

なお、芯材の既製杭としては、鋼管杭、あるいは高強度プレストレストコンクリート杭（ＰＨＣ杭）、外殻鋼管付きコンクリート杭（ＳＣ杭）、節杭等の既製コンクリート杭などを用いることができるが、高い水平耐力と経済性とを両立させるという観点から、鋼管杭を用いることがもっとも望ましい。   In addition, as the ready-made piles of the core material, steel pipe piles, high-strength prestressed concrete piles (PHC piles), concrete piles with outer shell steel pipes (SC piles), ready-made concrete piles such as joint piles, etc. can be used. It is most desirable to use steel pipe piles from the viewpoint of achieving both high horizontal strength and economy.

本発明における施工状況を示す平面図である。It is a top view which shows the construction condition in this invention. 従来の技術における合成摩擦杭の説明図である。It is explanatory drawing of the synthetic | combination friction pile in a prior art.

符号の説明Explanation of symbols

１、１ａ〜１ｆ 掘削孔
２ 既製杭（芯材、大径杭）
３ ソイルセメント柱状体
Ｇ 地盤
1, 1a-1f Excavation hole 2 Ready-made pile (core material, large-diameter pile)
3 Soil cement columnar G Ground

Claims (2)

地盤を柱状に掘削し、セメントミルクと掘削土砂とを攪拌してソイルセメントの柱状体を造成し、前記ソイルセメントが硬化しないうちにその中へ芯材として既製杭を建て込んでなる合成摩擦杭の造成方法において、前記既製杭が前記柱状体に対して大径のものであり、前記柱状体をこの既製杭の全周断面をカバーするように互いに接続させて複数個造成することを特徴とする合成摩擦杭の造成方法。   Synthetic friction pile that excavates the ground into a column, stirs cement milk and excavated earth and sand to form a column of soil cement, and builds a ready-made pile as a core material before the soil cement is hardened In the construction method, the ready-made piles have a large diameter with respect to the columnar body, and a plurality of the columnar bodies are connected to each other so as to cover the entire circumferential section of the ready-made pile. To create a synthetic friction pile. 前記既製杭が鋼管である請求項１に記載の合成摩擦杭の造成方法。   The method for producing a synthetic friction pile according to claim 1, wherein the ready-made pile is a steel pipe.
JP2008200799A 2007-08-03 2008-08-04 Synthetic friction pile construction method Active JP5136270B2 (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011038379A (en) * 2009-08-18 2011-02-24 Takenaka Komuten Co Ltd Method of installing cast-in-place pile
CN105019440A (en) * 2015-06-30 2015-11-04 周兆弟 Control tower pile used for manufacturing high-strength cemented soil mixing pile
WO2017000529A1 (en) * 2015-06-30 2017-01-05 周兆弟 Multi-drill soil-cement mixed pile with inserted prefabricated section bars
CN107761718A (en) * 2017-09-20 2018-03-06 中铁二院工程集团有限责任公司 Super-section tilting pile foundation self-supporting excavation construction method
CN108316292A (en) * 2018-02-08 2018-07-24 中交第二航务工程局有限公司 A kind of cement mixing pile pile group construction method
CN109898507A (en) * 2019-03-22 2019-06-18 浙江大学 It stirs grooving plug-in type and combines prefabricated profiled-cross-section composite base structure and construction method
CN109898506A (en) * 2019-03-22 2019-06-18 浙江大学 Stir grooving plug-in type Prefabricated composite box foundation structure and construction method
CN109944240A (en) * 2019-03-22 2019-06-28 浙江大学 Prefabricated tubbiness foundation structure and its construction method and device are implanted into after large-diameter annual stirring grooving

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5948528A (en) * 1982-09-13 1984-03-19 Kowa Shoko Kk Construction of underground space
JPS62268422A (en) * 1986-05-14 1987-11-21 Nippon Kokan Kk <Nkk> Friction pile
JPH07166537A (en) * 1993-12-14 1995-06-27 Seiko Kogyo Kk Precast concrete structure buried in ground and underground wall body buried with precast concrete structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5948528A (en) * 1982-09-13 1984-03-19 Kowa Shoko Kk Construction of underground space
JPS62268422A (en) * 1986-05-14 1987-11-21 Nippon Kokan Kk <Nkk> Friction pile
JPH07166537A (en) * 1993-12-14 1995-06-27 Seiko Kogyo Kk Precast concrete structure buried in ground and underground wall body buried with precast concrete structure

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011038379A (en) * 2009-08-18 2011-02-24 Takenaka Komuten Co Ltd Method of installing cast-in-place pile
CN105019440A (en) * 2015-06-30 2015-11-04 周兆弟 Control tower pile used for manufacturing high-strength cemented soil mixing pile
WO2017000529A1 (en) * 2015-06-30 2017-01-05 周兆弟 Multi-drill soil-cement mixed pile with inserted prefabricated section bars
CN107761718A (en) * 2017-09-20 2018-03-06 中铁二院工程集团有限责任公司 Super-section tilting pile foundation self-supporting excavation construction method
CN108316292A (en) * 2018-02-08 2018-07-24 中交第二航务工程局有限公司 A kind of cement mixing pile pile group construction method
CN108316292B (en) * 2018-02-08 2020-02-07 中交第二航务工程局有限公司 Construction method for cement mixing pile group
CN109898507A (en) * 2019-03-22 2019-06-18 浙江大学 It stirs grooving plug-in type and combines prefabricated profiled-cross-section composite base structure and construction method
CN109898506A (en) * 2019-03-22 2019-06-18 浙江大学 Stir grooving plug-in type Prefabricated composite box foundation structure and construction method
CN109944240A (en) * 2019-03-22 2019-06-28 浙江大学 Prefabricated tubbiness foundation structure and its construction method and device are implanted into after large-diameter annual stirring grooving
CN109898507B (en) * 2019-03-22 2024-06-11 浙江大学 Stirring grooving insertion type combined prefabricated special-shaped section composite foundation structure and construction method

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