WO2004085748A1 - Method of building pillar-like ground improving body using steel pipe pile - Google Patents

Method of building pillar-like ground improving body using steel pipe pile Download PDF

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Publication number
WO2004085748A1
WO2004085748A1 PCT/JP2003/003571 JP0303571W WO2004085748A1 WO 2004085748 A1 WO2004085748 A1 WO 2004085748A1 JP 0303571 W JP0303571 W JP 0303571W WO 2004085748 A1 WO2004085748 A1 WO 2004085748A1
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WO
WIPO (PCT)
Prior art keywords
steel pipe
pile
cement milk
ground
piles
Prior art date
Application number
PCT/JP2003/003571
Other languages
French (fr)
Japanese (ja)
Inventor
Sigeyoshi Hirata
Fujio Itagaki
Original Assignee
Daiwa House Industry Co., Ltd.
Fuji Shoji Kabushi Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daiwa House Industry Co., Ltd., Fuji Shoji Kabushi Kaisha filed Critical Daiwa House Industry Co., Ltd.
Priority to PCT/JP2003/003571 priority Critical patent/WO2004085748A1/en
Priority to AU2003221060A priority patent/AU2003221060A1/en
Publication of WO2004085748A1 publication Critical patent/WO2004085748A1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil

Definitions

  • the present invention relates to a method for constructing a columnar ground improvement body using a steel pipe pile.
  • the columnar ground improvement body has the advantage that the diameter is usually as large as 40 to 60 cm, for example, and therefore, the bearing capacity determined from the ground is large, but the strength of the pile, especially the bending strength, cannot be expected. There are drawbacks.
  • the columnar ground improvement body is constructed by excavating the ground with an excavator equipped with stirring blades and stirring and mixing the excavated earth and sand with cement milk.
  • the depth of the ground is not so deep, about 7 to 8 m, so that the columnar soil improvement cannot be formed deeper into the ground.
  • the supporting layer which is the supporting ground
  • the tip of the columnar ground improvement body that is, the lower end does not reach the supporting layer
  • the determined bearing capacity depends on the frictional force between the outer periphery of the columnar ground improvement body and the ground. If the ground is soft, even if the diameter of the columnar ground improvement body is large, the frictional support force It is possible that sufficient support cannot be obtained by itself.
  • the present invention provides a columnar structure using a steel pipe pile, in which the bearing capacity and the proof strength can be both increased in the above background, and a columnar ground improvement body can be efficiently constructed. It is an object to provide a method for constructing a ground improvement body. Another object of the present invention is that, in addition to the above, a columnar ground improvement body can be formed up to a considerably deep position in the ground, and whether the columnar ground improvement body is supported by the supporting force from the supporting ground. It is an object of the present invention to provide a method for constructing a columnar ground improvement body using steel pipe piles, which can obtain a large support force regardless of whether the ground is supported by the outer circumferential frictional force with the ground. Disclosure of the invention
  • the above-mentioned problem is to use a copper pipe pile with a drilling blade projecting laterally, a stirring part also projecting laterally, and a cement milk supply port at the tip of the pile steel pipe.
  • cement minolek supplied from the cement milk supply port and earth and sand shaved by the drilling blade are mixed by a stirring unit,
  • a columnar structure using a steel pipe pile characterized by solidifying the mixture of cement milk and earth and sand around the pile steel pipe while driving the steel pipe pile into the ground to form a columnar ground improvement body around the pile steel pipe.
  • the problem is solved by a method of constructing a ground improvement body.
  • the bearing capacity can be increased at the columnar ground improvement body portion, and further, the piled steel pipe at the core part is resistant to damage. Can be large.
  • first steel pipe pile provided with an excavating blade part protruding laterally, a stirring part also protruding laterally, and a cement milk supply port at a tip end of the pile steel pipe, and a joint pile Using one or more second steel pipe piles as
  • the bearing capacity can be increased at the columnar ground improvement part, and the copper pipe at the core can also increase the resistance to power. It is possible to efficiently construct a composite structure consisting of a pile and a columnar ground improvement body.
  • the steel pipe piles used are not limited to one of the first steel pipe piles, and one or more second steel pipe piles are used as joint piles.
  • the piles are rotated and pressed into the ground while joining the piles.
  • the mixture of cement milk and earth and sand around the pile steel pipe is solidified while the steel pipe pile is driven into the ground, and a columnar shape is formed around the first and second steel pipe piles.
  • a columnar ground improvement body can be formed to a considerable depth in the ground, and it is the supporting force from the supporting ground or the supporting force due to the outer peripheral frictional force with the ground Regardless, you can get a very large bearing capacity.
  • the pumping power of the cement milk pump to the cement milk supply port is increased in the process of rotating and pressing the first and second steel pipe piles into the ground while splicing them.
  • the first and second steel pipe piles are rotated and pressed deep into the ground while being spliced, and a sufficient amount of cement milk is supplied from the cement milk supply rocker at the tip of the first steel pipe pile.
  • FIG. 1 is a side view of a steel pipe pile
  • FIG. 2 is a cross-sectional side view of a steel pipe pile tip
  • Fig. 4 is an enlarged cross-sectional side view showing the connection between the steel pipe pile and the pile driver
  • Figs. 5 and 6 are cross-sectional side views sequentially showing the pile driving process
  • Fig. 7 is
  • FIG. 8 is a cross-sectional side view showing an enlarged state of the tip end of the pile during pile driving
  • FIG. 8 is a cross-sectional side view of a columnar ground improvement body constructed underground by the method of the first embodiment.
  • FIG. 9 to 18 show the second embodiment.
  • FIG. 9 is a side view of the first steel pipe pile
  • FIG. 10 is a sectional side view of the tip of the first steel pipe pile
  • FIG. The figure is a side view of the steel pipe pile No. 2
  • Fig. 12 is a cross-sectional side view showing the driving state of the steel pipe pile No. 1
  • Fig. 13 is a cross-sectional side view showing an enlarged state of the tip of the pile during driving.
  • Fig. 14 is a cross-sectional side view showing the state of the first steel pipe pile after driving
  • Fig. 15 is a cross-sectional side view showing the state of the connection of the second steel pipe pile to the first copper pipe pile
  • Fig. 6 is a cross-sectional side view showing the driving state after pile joining
  • Fig. 17 is a cross-sectional side view showing the state after driving
  • Fig. 18 is a columnar ground constructed underground by the method of the second embodiment. It is a sectional side view of an improved object. BEST MODE FOR CARRYING OUT THE INVENTION
  • reference numeral 2 denotes a pile steel pipe, and at the tip of the pile steel pipe 2, as shown in an enlarged manner in FIG.
  • a spiral excavating blade 3 having the function of a widened bottom wing extending laterally, and a stirring unit 4 also extending laterally are arranged adjacently with the excavating blade 3 below and the stirring unit 4 upward. It is provided.
  • a cement milk supply port 5 is provided on the peripheral wall at the tip of the pile steel pipe 2. The cement milk supply port 5 is provided with a spring packing.
  • the tip of the pile steel pipe 2 is closed by a lid 6, and a tip excavation blade 7 is provided so as to protrude more distally than the lid 6, and a middle part in the longitudinal direction of the pile steel pipe 2 is shown in FIG. As shown in the figure, spiral wings 8 projecting laterally are provided at intervals to form a multi-wing pile.
  • the columnar ground improvement body is constructed using the steel pipe pile 1 as follows. That is, first, as shown in FIGS. 3 and 4, a steel pipe pile 1 is screwed into a pipe joint 11 projecting downward from a rotary press-fitting motor 10 of a pile driver 9 for rotary press-fitting. Union Connect and set.
  • the pipe joint 11 is connected to a mixer plant 13 through a hose 12.
  • the cement-based solidified material is dissolved in water to produce a milky cement milk, which is then formed in the mixer plant 13.
  • the supplied cement milk is fed into the pile steel pipe 2 through the pipe joint 1 1 by a pump (not shown) under the control of the pile driver 9, and is ejected from the cement milk supply port 5 at the tip of the pile steel pipe 2. It has been made to be.
  • the pipe joint 11 is provided with a check valve 14.
  • the steel pipe pile 1 is pressed into the ground 15 while being driven by the pile driver 9 while rotating.
  • 16 is a support layer.
  • cement milk 17 is ejected from cement milk supply port 5 at the tip of pile steel pipe 2.
  • cement milk 17 is injected into the earth 18 excavated by the laterally protruding excavating blade 3 at the tip of the steel pipe pile 1, and these are stirred by the agitator 4 to mix the earth 18 with the cement milk 17.
  • the mixture 19 is formed on the outer peripheral side of the pile steel pipe 2.
  • the upper spiral blades 8 also contribute to the stirring.
  • the steel pipe pile 1 may be excavated only in the driving direction while rotating, or if the excavation alone does not sufficiently mix the excavated earth 18 and the cement milk 17, the steel pipe pile 1 may be rotated. It is advisable to move in the direction of pulling out appropriately so as to advance.
  • the columnar ground improvement body 20 may be constructed as a friction pile type that does not reach the support layer 16 or may be constructed as a support pile type supported by the support layer 16.
  • the piled steel pipe 2 is inserted into the core of the constructed columnar ground improvement body 20, a large supporting force is obtained by the columnar ground improvement body 20.
  • the yield strength becomes large.
  • the pull-out resistance can be increased, and it can be used for a pencil building.
  • the pile steel pipe 2 is inserted into the core of the columnar ground improvement body 20 obtained by the method of the present invention, when the foundation beam is made of steel, the columnar ground improvement body is used. The advantage that the connection between 20 and the foundation beam can be easily carried out using the steel pipe pile 1 at the core is also exhibited.
  • a tip of a steel pipe pile is separately provided with a side-projecting excavation blade and a side-projecting agitator, similarly.
  • the excavating blade may be provided with a stirring function, and may be provided with an excavating blade with a stirring function combining the two, and the excavating blade and the stirring unit described in the claims are used in that sense.
  • the middle spiral blades 8 may be omitted.
  • the first steel pipe pile 1 is substantially the same as the steel pipe pile of the first embodiment, and has a spiral excavating blade 3, a stirring section 4, and a cement milk supply port 5 at the tip, that is, at the lower end of the pile steel pipe 2. It is equipped with.
  • the base end of the pile steel pipe 2 that is, the upper end is open, the tip is closed by a lid part 6, and a tip drilling blade part 7 is provided.
  • Spiral wings 8 are provided at intervals and are formed in a multi-wing steel pipe pile.
  • the first steel pipe pile 1 is used in forming one columnar ground improvement body.
  • the second steel pipe pile 22 also includes the pile steel pipe 2, and spiral wings 8 projecting laterally are provided at intervals in a longitudinally intermediate portion of the pile steel pipe 2.
  • a multi-wing steel pipe pile is formed.
  • the excavation blade 3 and the stirring part 4 are provided at the tip end, that is, the lower end of the pile steel pipe 2, similarly to the first steel pipe pile 1. Not provided.
  • the tip, ie, the lower end, of the pile steel pipe 2 is open without being closed by the lid, like the base end, ie, the upper end.
  • One or more of the second steel pipe piles 22 are used in forming one columnar ground improvement body.
  • the columnar ground improvement body is constructed using the first and second steel pipe piles 1 and 2 described above, for example, as follows. That is, first, as in the first embodiment, the first steel pipe pile 1 has its upper end protruding downward from the rotary press-fitting motor 10 of the rotary press-fitting pile driver. Set it on the pile driver in a state where it is screwed and connected with the fitting 1 to be put out.
  • the first steel pipe pile 1 is pressed into the ground 15 and driven into the ground 15 while rotating the first steel pipe pile 1 with a pile driving machine.
  • cement milk 17 is ejected from the cement milk supply port 5 at the tip of the pile steel pipe 2 of the first steel pipe pile 1.
  • cement minolec 17 is injected into earth 18 excavated by the laterally protruding excavating blade 3 at the tip of the first steel pipe pile 1, and these are stirred by the stirring section 4, and the earth 18 and cement milk A mixture 19 with 17 is formed on the outer peripheral side of the pile steel pipe 2 of the first steel pipe pile 1.
  • cement milk is discharged from the cement milk supply port at the tip of the first steel pipe pile 1, and a mixture 19 of soil and cement milk is supplied to the first and second steel pipe piles 1, 2. Formed on the outer peripheral side of each pile steel pipe.
  • the tip of the second steel pipe pile 2 is provided with the excavating blade 3 and the stirring section 4 that protrude to the side, so that the excavation and the stirring are performed firmly.
  • the upper end of the first steel pipe pile 1 and the lower end of the second steel pipe pile 22 may be directly connected with a screw type, or may be connected with a screw type via joint parts.
  • the connection may be made by welding or the like without using screws, other connection methods may be used, and there is no particular limitation.
  • the point is that the first and second steel pipe piles 1 and 22 are driven into the ground integrally by the application of rotational pressure input to the second steel pipe pile 22, and the second steel pipe pile 2 It is only necessary that the cement milk supplied from the upper end of 2 is connected so as to be discharged from the cement milk supply port 5 at the tip of the first steel pipe pile 1.
  • the cement milk pouring into the cement milk supply port at the tip of the first steel pipe pile 1 If the pumping power of the pump is insufficient, the pumping power of cement milk by the pump should be increased to ensure that the cement milk supply port at the tip of the first steel pipe pile 1 The supply of cement milk can be continued.
  • first and second steel pipe piles 1 and 2 are spliced and driven deep into the ground, and when the tip of the first copper pipe pile 1 reaches the support layer 16, these first and second steel pipe piles 1 Leave piles 1 and 2 in place without removing them. Then, after a certain period of time, the mixture 19 of excavated earth and sand and cement milk on the outer peripheral side of each of the first and second steel pipe piles 1 and 2 solidifies, as shown in Fig. 18 As described above, the columnar ground improvement body 20 having the pile steel pipes 2 and 2 at the core is constructed underground.
  • the columnar ground improvement body 20 contains the first and second steel pipe piles 1 and 22 spliced to its core, the columnar ground improvement body 20 is large. In addition to providing a good bearing capacity, these pile steel pipes at the core increase the strength.
  • the excavation of the ground 15, the supply of the cement milk 17, and the stirring and mixing of the excavated soil 18 and the cement milk 17 are performed by the excavating blade 3 and the stirring unit 4 provided in the first steel pipe pile 1.
  • the mixture 19 of the cement milk and the earth and sand around the pile steel pipes 2 and 2 is solidified while being driven into the pile, and the columnar ground improvement body 20 is formed around the pile steel pipes 2 and 2, It is possible to efficiently construct such a composite structure of the steel pipe piles 1 and 22 and the columnar ground improvement body 20.
  • the first and second steel pipe piles 1 and 2 are used for splicing.
  • the cement milk supplied from the cement milk supply port 5 of the first steel pipe pile 1 was removed by the drilling blade 3 during the rotary press-fitting process.
  • the mixture 19 of the cement milk and the soil around the pile steel pipes 2 and 2 is left while the steel pipe piles 1 and 2 are driven into the ground.
  • the columnar ground improvement body 20 is formed around the first and second steel pipe piles 1 and 22, the columnar ground improvement body 20 can be formed deep into the ground.
  • deep underground Support 16 can be received by the support layer 16 located at a higher position, and a large supporting force can be obtained.
  • the first and second steel pipe piles 1 and 22 are used to join the piles, so that the pile-column ground improvement body 20 reaches the support layer 16 which is the support ground.
  • the first and second steel pipe piles 1 and 22 are used for splicing to improve the pile columnar ground improvement body 20. May be used to form a pile-column ground improvement body 20 in the form of a friction pile, which does not reach the support layer 16 as the support ground but extends deep into the ground.
  • one column-shaped ground improvement body 20 is formed by using one second steel pipe pile 22 as a joint pile, but one first steel pipe pile 22 is used.
  • the pile 1 and two or more second steel pipe piles 22 may be spliced to form one columnar ground improvement body 20.
  • the first steel pipe pile 1 has an example in which a tip of the first steel pipe pile 1 is separately provided with a laterally extending excavation blade 3 and a laterally extending stirring part 4. It is also possible to provide an excavating blade part with a stirring function that combines the two with the extruding blade part that protrudes laterally.
  • the excavation blade 3 and the stirring section 4 may be omitted in the second steel pipe pile 22, and the intermediate spiral blades 8 may be omitted in the first and second steel pipe piles 1 and 22.
  • a columnar ground improvement body can be formed to a very deep position inside, and large support is provided regardless of whether it is the support force from the supporting ground or the outer peripheral frictional force with the ground. You can gain strength.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Piles And Underground Anchors (AREA)

Abstract

A method of building a pillar-like ground improving body using a steel pipe, which method is capable of increasing both support force and yield strength and yet capable of efficient building. It comprises the steps of using a steel pipe pile (1) having, at the front end of a pile steel pipe (2), a laterally extending excavating blade (3), a laterally extending stirring section (4), and a cement milk supply port (5), driving the steel pipe pile (1) into the ground (15) while rotating it, during which step cement milk supplied from the cement milk supply port (5) and earth and sand excavated by the laterally extending excavating blade (3) are mixed in the stirring section (4), allowing the mixture of cement milk and earth and sand around the pile steel pipe (2) to solidify with the steel pipe pile (1) driven into the ground (15), thus forming a pillar-like ground improving body (20) around the pile steel pipe (2).

Description

鋼管杭を用いた柱状地盤改良体の構築方法 技術分野  Construction method of columnar ground improvement body using steel pipe pile
本発明は、 鋼管杭を用いた柱状地盤改良体の構築方法に関する。 背景技術 明  The present invention relates to a method for constructing a columnar ground improvement body using a steel pipe pile. Background art
小規模建築物に用いられる基礎の補強には、 鋼管杭や柱状地盤改良体などが 用いられている。 書  Steel pipe piles and columnar ground improvements are used to reinforce the foundations used for small buildings. book
しかしながら、鋼管杭は、杭自身の耐力が大きいという利点を有するものの、 使用する杭の直径が通常例えば 1 0〜2 0 c mと小さく、 そのため、 地盤から定 まる支持力が小さいという欠点がある。  However, although steel pipe piles have the advantage that the piles themselves have high strength, the diameter of the piles used is usually small, for example, 10 to 20 cm, and therefore has the disadvantage that the bearing capacity determined from the ground is small.
その一方、 柱状地盤改良体は、 直径が通常例えば 4 0〜6 0 c mと大きく、 そのため、 地盤から定まる支持力が大きいという利点を有するものの、 杭として の耐力、 特に曲げ耐カを期待できないという欠点がある。  On the other hand, the columnar ground improvement body has the advantage that the diameter is usually as large as 40 to 60 cm, for example, and therefore, the bearing capacity determined from the ground is large, but the strength of the pile, especially the bending strength, cannot be expected. There are drawbacks.
また、 柱状地盤改良体は、 撹拌翼を備えた掘削機で地盤を掘削し、 掘削した 土砂とセメントミルクとを撹拌混合することにより構築されるものであり、 掘削 機で掘削できる地盤の深さの限界は一般的に 7〜 8 m程度とあまり深くないため、 柱状地盤改良体を地中のより深い位置まで形成することができない。 そのため、 支持地盤である支持層が上記のような掘削限界深さ位置よりも深い位置に位置す るような場合は、 柱状地盤改良体の先端、 即ち下端部が支持層に届かず、 地盤か ら定まる支持力が、 柱状地盤改良体の外周部と地盤との摩擦力に依存することに なり、 地盤が軟弱であると、 いくら柱状地盤改良体の直径が大きいといえども、 その摩擦支持力だけでは、 充分な支持力を得ることができないということも起こ り得る。  The columnar ground improvement body is constructed by excavating the ground with an excavator equipped with stirring blades and stirring and mixing the excavated earth and sand with cement milk. Generally, the depth of the ground is not so deep, about 7 to 8 m, so that the columnar soil improvement cannot be formed deeper into the ground. Therefore, when the supporting layer, which is the supporting ground, is located at a position deeper than the excavation limit depth as described above, the tip of the columnar ground improvement body, that is, the lower end does not reach the supporting layer, and The determined bearing capacity depends on the frictional force between the outer periphery of the columnar ground improvement body and the ground.If the ground is soft, even if the diameter of the columnar ground improvement body is large, the frictional support force It is possible that sufficient support cannot be obtained by itself.
本発明は、 上記のような背景において、 支持力と耐力とをいずれも大きなも のにすることができ、 それでいて、 柱状地盤改良体を能率良く構築することがで きる、 鋼管杭を用いた柱状地盤改良体の構築方法を提供することを課題とする。 また、 本発明のもう一つの課題は、 それに加えて、 地中のかなり深い位置ま で柱状地盤改良体を形成することができ、 柱状地盤改良体が支持地盤からの支持 力で支持されるか、 地盤との外周摩擦力による支持力で支持されるかを問わず、 大きな支持力を得ることができる、 鋼管杭を用いた柱状地盤改良体の構築方法を 提供することである。 発明の開示 The present invention provides a columnar structure using a steel pipe pile, in which the bearing capacity and the proof strength can be both increased in the above background, and a columnar ground improvement body can be efficiently constructed. It is an object to provide a method for constructing a ground improvement body. Another object of the present invention is that, in addition to the above, a columnar ground improvement body can be formed up to a considerably deep position in the ground, and whether the columnar ground improvement body is supported by the supporting force from the supporting ground. It is an object of the present invention to provide a method for constructing a columnar ground improvement body using steel pipe piles, which can obtain a large support force regardless of whether the ground is supported by the outer circumferential frictional force with the ground. Disclosure of the invention
上記の課題は、 杭鋼管の先端部に、 側方に張り出す掘削刃と、 同じく側方に 張り出す撹拌部と、 セメントミルク供給口が設けられた銅管杭を用い、  The above-mentioned problem is to use a copper pipe pile with a drilling blade projecting laterally, a stirring part also projecting laterally, and a cement milk supply port at the tip of the pile steel pipe.
この鋼管杭を回転させながら地中に打ち込んでいく過程で、 セメントミルク 供給口から供給されるセメントミノレクと、 前記掘削刃で削られた土砂とを撹拌部 によって混合し、  In the process of driving the steel pipe pile into the ground while rotating it, cement minolek supplied from the cement milk supply port and earth and sand shaved by the drilling blade are mixed by a stirring unit,
この鋼管杭を地中に打ち込んだまま、 杭鋼管の周囲のセメントミルクと土砂 との混合物を固化させ、 杭鋼管の周囲に柱状地盤改良体を形成することを特徴と する鋼管杭を用いた柱状地盤改良体の構築方法によつて解決される。  A columnar structure using a steel pipe pile characterized by solidifying the mixture of cement milk and earth and sand around the pile steel pipe while driving the steel pipe pile into the ground to form a columnar ground improvement body around the pile steel pipe The problem is solved by a method of constructing a ground improvement body.
この構築方法によれば、 得られる柱状地盤改良体には、 その芯部に杭鋼管が 入っているので、 柱状地盤改良体部分で支持力を大きくでき、 しかも、 芯部の杭 鋼管で耐カを大きなものにすることができる。  According to this construction method, since the piled steel pipe is inserted into the core of the obtained columnar ground improvement body, the bearing capacity can be increased at the columnar ground improvement body portion, and further, the piled steel pipe at the core part is resistant to damage. Can be large.
更にまた、 第一に、 地中の掘削、 セメントミルクの供給、 掘削した土砂とセ メントミルクの撹拌混合は、 鋼管杭に備えられている掘削刃と撹拌部とセメント ミルク供給口を用い、 鋼管杭を回転させて打ち込みながら行うようにしているこ と、 そして第二に、 この鋼管杭を地中に打ち込んだまま、 杭鋼管の周囲のセメン トミルクと土砂との混合物を固化させ、 杭鋼管の周囲に柱状地盤改良体を形成す るようにしていることの二つの相乗作用によって、 このような鋼管杭と柱状地盤 改良体との複合構造を能率良く構築していくことができる。  Furthermore, first, excavation in the ground, supply of cement milk, stirring and mixing of excavated earth and sand and cement milk are performed using the drilling blade and stirring section provided on the steel pipe pile and the cement milk supply port. Secondly, the pile is rotated and driven, and secondly, while the steel pipe pile is driven into the ground, the mixture of cement milk and earth and sand around the pile steel pipe is solidified, The two synergistic effects of the formation of the columnar soil improvement around it make it possible to efficiently construct such a composite structure of such steel pipe piles and the columnar soil improvement.
また、 上記の課題は、 杭鋼管の先端部に、 側方に張り出す掘削刃部、 同じく 側方に張り出す撹拌部、及び、セメントミルク供給口が設けられた第 1鋼管杭と、 継ぎ杭としての 1本又は複数本の第 2鋼管杭とを用い、  In addition, the above-mentioned problem is that a first steel pipe pile provided with an excavating blade part protruding laterally, a stirring part also protruding laterally, and a cement milk supply port at a tip end of the pile steel pipe, and a joint pile Using one or more second steel pipe piles as
第 1、 第 2の鋼管杭を杭継ぎをしながら地中に回転圧入していく過程で、 前 記第 1鋼管杭のセメントミルク供給口から供給されるセメントミルクと、 掘削刃 部で削られた土砂とを撹拌部で撹拌し、 杭打ち後、 これら鋼管杭を地中に打ち込 んだまま、 杭銅管の周囲のセメントミノレクと土砂との混合物を固化させ、 第 1， 第 2の鋼管杭の周囲に柱状地盤改良体を形成することを特徴とする鋼管杭を用い た柱状地盤改良体の構築方法によつて解決される。 In the process of rotating and pressing the first and second steel pipe piles into the ground while joining them, The cement milk supplied from the cement milk supply port of the first steel pipe pile and the earth and sand shaved by the excavation blade are stirred by the stirrer. A columnar ground improvement using steel pipe piles characterized by solidifying a mixture of cement minolec and earth and sand around pile copper pipes and forming a columnar ground improvement body around the first and second steel pipe piles It is solved by the method of building the body.
この構築方法によれば、 同様に、 柱状地盤改良体部分で支持力を大きくする ことができると共に、芯部の杭銅管で耐カを大きなものにすることができ、また、 同様に、 鋼管杭と柱状地盤改良体との複合構造を能率良く構築していくことがで きる。  According to this construction method, similarly, the bearing capacity can be increased at the columnar ground improvement part, and the copper pipe at the core can also increase the resistance to power. It is possible to efficiently construct a composite structure consisting of a pile and a columnar ground improvement body.
のみならず、 使用する鋼管杭は、 第 1鋼管杭の 1本だけではなく、 その他、 継ぎ杭として 1本又は複数本の第 2鋼管杭を用いており、 これら第 1、 第 2の鋼 管杭を杭継ぎを ·しながら地中に回転圧入していくようにし、 その過程で、 第 1鋼 管杭のセメントミルク供給口から供給されるセメントミルクと、 掘削刃部で削ら れた土砂とを撹拌部で撹拌し、杭打ち後、これら鋼管杭を地中に打ち込んだまま、 杭鋼管の周囲のセメントミルクと土砂との混合物を固化させ、 第 1， 第 2の鋼管 杭の周囲に柱状地盤改良体を形成するものであるから、 地中のかなり深くまで柱 状地盤改良体を形成することができ、 支持地盤からの支持力であるか、 地盤との 外周摩擦力による支持力であるかを問わず、 非常に大きな支持力を得ることがで ぎる。  In addition, the steel pipe piles used are not limited to one of the first steel pipe piles, and one or more second steel pipe piles are used as joint piles. The piles are rotated and pressed into the ground while joining the piles.In the process, the cement milk supplied from the cement milk supply port of the No. 1 steel pipe pile and the sediment shaved by the drilling blade After the pile is driven, the mixture of cement milk and earth and sand around the pile steel pipe is solidified while the steel pipe pile is driven into the ground, and a columnar shape is formed around the first and second steel pipe piles. Since it forms a ground improvement body, a columnar ground improvement body can be formed to a considerable depth in the ground, and it is the supporting force from the supporting ground or the supporting force due to the outer peripheral frictional force with the ground Regardless, you can get a very large bearing capacity.
上記の方法において、 第 1、 第 2の鋼管杭を杭継ぎをしながら地中に回転圧 入していく過程で、 セメントミルク供給口へのセメントミルクのポンプによる圧 送力を上昇させていく場合は、 第 1、 第 2の鋼管杭を杭継ぎをしながら地中深く に回転圧入していく過程で、 第 1鋼管杭の先端部のセメントミルク供給ロカゝら充 分な量のセメントミルクを供給し続けることができ、 構築される柱状地盤改良体 の下端部をも含めて品質良好な柱状地盤改良体を構築することができる。 図面の簡単な説明  In the above method, the pumping power of the cement milk pump to the cement milk supply port is increased in the process of rotating and pressing the first and second steel pipe piles into the ground while splicing them. In the process, the first and second steel pipe piles are rotated and pressed deep into the ground while being spliced, and a sufficient amount of cement milk is supplied from the cement milk supply rocker at the tip of the first steel pipe pile. Thus, it is possible to construct a columnar ground improvement body of good quality including the lower end of the columnar ground improvement body to be constructed. BRIEF DESCRIPTION OF THE FIGURES
第 1図乃至第 8図は第 1実施形態を示すもので、 第 1図は鋼管杭の側面図、 第 2図は鋼管杭先端部の断面側面図、 第 3図は杭打ちに用いる設備の全体を示す 側面図、 第 4図は鋼管杭と杭打ち機との連結部を拡大して示す断面側面図、 第 5 図及び第 6図は杭打ちの過程を順次に示す断面側面図、 第 7図は杭打ち中の杭先 端部の状態を拡大して示す断面側面図、 第 8図は第 1実施形態の方法により地中 に構築された柱状地盤改良体の断面側面図である。 1 to 8 show the first embodiment. FIG. 1 is a side view of a steel pipe pile, FIG. 2 is a cross-sectional side view of a steel pipe pile tip, and FIG. Show the whole Side view, Fig. 4 is an enlarged cross-sectional side view showing the connection between the steel pipe pile and the pile driver, Figs. 5 and 6 are cross-sectional side views sequentially showing the pile driving process, and Fig. 7 is FIG. 8 is a cross-sectional side view showing an enlarged state of the tip end of the pile during pile driving, and FIG. 8 is a cross-sectional side view of a columnar ground improvement body constructed underground by the method of the first embodiment.
第 9図乃至第 1 8図は第 2実施形態を示すもので、 第 9図は第 1鋼管杭の側 面図、 第 1 0図は第 1鋼管杭先端部の断面側面図、 第 1 1図は第 2鋼管杭の側面 図、 第 1 2図は第 1鋼管杭の打込み状態を示す断面側面図、 第 1 3図は杭打ち中 の杭先端部の状態を拡大して示す断面側面図、 第 1 4図は第 1鋼管杭の打込み後 の状態を示す断面側面図、 第 1 5図は第 1銅管杭への第 2鋼管杭の杭継ぎの状態 を示す断面側面図、 第 1 6図は杭継ぎ後の打込み状態を示す断面側面図、 第 1 7 図は打込み後の状態を示す断面側面図、 第 1 8図は第 2実施形態の方法により地 中に構築された柱状地盤改良体の断面側面図である。 発明を実施するための最良の形態  9 to 18 show the second embodiment. FIG. 9 is a side view of the first steel pipe pile, FIG. 10 is a sectional side view of the tip of the first steel pipe pile, and FIG. The figure is a side view of the steel pipe pile No. 2, Fig. 12 is a cross-sectional side view showing the driving state of the steel pipe pile No. 1, and Fig. 13 is a cross-sectional side view showing an enlarged state of the tip of the pile during driving. Fig. 14 is a cross-sectional side view showing the state of the first steel pipe pile after driving, Fig. 15 is a cross-sectional side view showing the state of the connection of the second steel pipe pile to the first copper pipe pile, and Figs. Fig. 6 is a cross-sectional side view showing the driving state after pile joining, Fig. 17 is a cross-sectional side view showing the state after driving, and Fig. 18 is a columnar ground constructed underground by the method of the second embodiment. It is a sectional side view of an improved object. BEST MODE FOR CARRYING OUT THE INVENTION
次に、 本発明の実施形態を図面に基づいて説明する。  Next, an embodiment of the present invention will be described with reference to the drawings.
第 1図及び第 2に示す第 1実施形態の方法に用いる鋼管杭 1において、 2は 杭鋼管であり、 この杭鋼管 2の先端部には、 第 2図に拡大して示すように、 鋼管 外周部において、 側方に張り出す拡底翼機能を持つ螺旋状の掘削刃 3と、 同じく 側方に張り出す撹拌部 4とが、 掘削刃 3を下、 撹拌部 4を上にして隣り合って備 えられている。 更に、 杭鋼管 2の先端の周壁には、 セメントミルク供給口 5が備 えられている。 セメントミルク供給口 5にはスプリングパッキンが備えられてい る。  In the steel pipe pile 1 used in the method of the first embodiment shown in FIGS. 1 and 2, reference numeral 2 denotes a pile steel pipe, and at the tip of the pile steel pipe 2, as shown in an enlarged manner in FIG. At the outer peripheral part, a spiral excavating blade 3 having the function of a widened bottom wing extending laterally, and a stirring unit 4 also extending laterally are arranged adjacently with the excavating blade 3 below and the stirring unit 4 upward. It is provided. Further, a cement milk supply port 5 is provided on the peripheral wall at the tip of the pile steel pipe 2. The cement milk supply port 5 is provided with a spring packing.
なお、 杭鋼管 2の先端は蓋 6で閉じられ、 この蓋 6よりも先端側に突出する ように先端掘削刃 7が備えられ、 また、 杭鋼管 2の長手方向中間部には、 第 2図 に示すように、 側方に張り出す螺旋翼 8…が間隔的に設けられて、 多翼杭に形成 されている。  The tip of the pile steel pipe 2 is closed by a lid 6, and a tip excavation blade 7 is provided so as to protrude more distally than the lid 6, and a middle part in the longitudinal direction of the pile steel pipe 2 is shown in FIG. As shown in the figure, spiral wings 8 projecting laterally are provided at intervals to form a multi-wing pile.
柱状地盤改良体の構築は、 この鋼管杭 1を用いて、 次のようにして行う。 即 ち、 まず、 第 3図及び第 4図に示すように、 鋼管杭 1を、 その上端を回転圧入用 の杭打ち機 9の回転圧入モーター 1 0から下方に突出する管継ぎ手 1 1と螺合連 結してセットする。 The columnar ground improvement body is constructed using the steel pipe pile 1 as follows. That is, first, as shown in FIGS. 3 and 4, a steel pipe pile 1 is screwed into a pipe joint 11 projecting downward from a rotary press-fitting motor 10 of a pile driver 9 for rotary press-fitting. Union Connect and set.
この管継ぎ手 1 1は、 ホース 1 2を通じてミキサープラント 1 3と接続され ており、 ミキサープラント 1 3ではセメント系固化材を水に溶かしてミルク状に したセメントミルクをつくり、 ミキサープラント 1 3でつくられたセメントミル クが、 杭打ち機 9からのコントロールによって、 図示しないポンプで、 管継ぎ手 1 1を通じて杭鋼管 2内に送り込まれ、 杭鋼管 2の先端部のセメントミルク供給 口 5から外に噴出するようになされている。 なお、 管継ぎ手 1 1には逆止弁 1 4 が設けられている。  The pipe joint 11 is connected to a mixer plant 13 through a hose 12. In the mixer plant 13, the cement-based solidified material is dissolved in water to produce a milky cement milk, which is then formed in the mixer plant 13. The supplied cement milk is fed into the pile steel pipe 2 through the pipe joint 1 1 by a pump (not shown) under the control of the pile driver 9, and is ejected from the cement milk supply port 5 at the tip of the pile steel pipe 2. It has been made to be. The pipe joint 11 is provided with a check valve 14.
しかる後、 第 5図及び第 6図に示すように、 杭打ち機 9で鋼管杭 1を回転さ せながら地盤 1 5中に圧入して打ち込んでいく。 1 6は支持層である。 この回転 圧入中、 第 7図に示すように、 杭鋼管 2の先端部のセメントミルク供給口 5から セメントミルク 1 7を噴出させる。 これにより、 鋼管杭 1の先端の側方突出掘削 刃 3で掘削された土砂 1 8にセメントミルク 1 7が注入され、 これらが撹拌部 4 によって撹拌され、 土砂 1 8とセメントミルク 1 7との混合体 1 9が杭鋼管 2の 外周側に形成されていく。 また、 上方の螺旋翼 8…も撹拌に寄与する。 なお、 鋼 管杭 1は、 回転させながら打ち込み方向にのみ掘進させていってもよいし、 掘進 のみでは掘削土砂 1 8とセメントミルク 1 7との混合が不足するような場合には 回転させながら適当に引き抜き方向にも変位させて打ち進んでいくようにするの あよい。  Thereafter, as shown in FIGS. 5 and 6, the steel pipe pile 1 is pressed into the ground 15 while being driven by the pile driver 9 while rotating. 16 is a support layer. During this press-fitting, as shown in FIG. 7, cement milk 17 is ejected from cement milk supply port 5 at the tip of pile steel pipe 2. As a result, cement milk 17 is injected into the earth 18 excavated by the laterally protruding excavating blade 3 at the tip of the steel pipe pile 1, and these are stirred by the agitator 4 to mix the earth 18 with the cement milk 17. The mixture 19 is formed on the outer peripheral side of the pile steel pipe 2. The upper spiral blades 8 also contribute to the stirring. In addition, the steel pipe pile 1 may be excavated only in the driving direction while rotating, or if the excavation alone does not sufficiently mix the excavated earth 18 and the cement milk 17, the steel pipe pile 1 may be rotated. It is advisable to move in the direction of pulling out appropriately so as to advance.
こうして鋼管杭 1を打ち込んだ後、 この銅管杭 1を抜き去ることなくそのま まの打ち込み状態にする。そうすると、一定期間経過後に、杭鋼管 2の外周側の、 掘削土砂 ·セメントミルク混合体 1 9が固化し、 第 8図に示すように、 芯部に杭 鋼管 2を備えた柱状地盤改良体 2 0が地中に構築される。 なお、 柱状地盤改良体 2 0は、 支持層 1 6に至らせない摩擦杭形式として構築してもよいし、 支持層 1 6に支持させた支持杭形式として構築してもよい。  After the steel pipe pile 1 has been driven in this way, the copper pipe pile 1 is left in the same driving state without being pulled out. Then, after a certain period of time, the excavated sediment / cement milk mixture 19 on the outer peripheral side of the pile steel pipe 2 is solidified, and as shown in FIG. 8, the columnar ground improvement body 2 having the pile steel pipe 2 in the core is provided. 0 is built underground. The columnar ground improvement body 20 may be constructed as a friction pile type that does not reach the support layer 16 or may be constructed as a support pile type supported by the support layer 16.
構築されたこの柱状地盤改良体 2 0にはその芯部に杭鋼管 2が入っているの で、 柱状地盤改良体 2 0によって大きな支持力が得られ、 芯部の杭鋼管 2によつ て耐力が大きなものになる。 更に、 引き抜き耐カも大きなものにすることができ て、 ペンシルビルに用レヽることなども可能となる。 また、 本発明方法によって得られる柱状地盤改良体 2 0の芯部には、 このよ うに杭鋼管 2が入っているので、 基礎梁を鉄骨造とするような場合には、 柱状地 盤改良体 2 0と基礎梁との取り合いを芯部の鋼管杭 1を利用して容易に行ってい くことができるという利点も発揮される。 Since the piled steel pipe 2 is inserted into the core of the constructed columnar ground improvement body 20, a large supporting force is obtained by the columnar ground improvement body 20. The yield strength becomes large. In addition, the pull-out resistance can be increased, and it can be used for a pencil building. Further, since the pile steel pipe 2 is inserted into the core of the columnar ground improvement body 20 obtained by the method of the present invention, when the foundation beam is made of steel, the columnar ground improvement body is used. The advantage that the connection between 20 and the foundation beam can be easily carried out using the steel pipe pile 1 at the core is also exhibited.
なお、 上記の第 1実施形態では、 鋼管杭の先端部に側方張出しの掘削刃と同 じく側方張出しの撹拌部とを個別に備えさせた例を示しているが、 側方張出しの 掘削刃に撹拌機能をもたせ、 両者を合わせた撹拌機能付き掘削刃を備えさせるよ うにしてもよく、 請求の範囲に記載の掘削刃と撹拌部とはその意味で使用してい る。 また、 鋼管杭 1において、 中間の螺旋翼 8…は省略されてもよい。  In the first embodiment described above, an example is shown in which a tip of a steel pipe pile is separately provided with a side-projecting excavation blade and a side-projecting agitator, similarly. The excavating blade may be provided with a stirring function, and may be provided with an excavating blade with a stirring function combining the two, and the excavating blade and the stirring unit described in the claims are used in that sense. In the steel pipe pile 1, the middle spiral blades 8 may be omitted.
次に説明する第 2実施形態の方法では、 第 9及び第 1 0図に示すような第 1 鋼管杭 1と、 第 1 1図に示すような継ぎ杭としての第 2鋼管杭 2 2とを用いる。 第 1鋼管杭 1は、第 1実施形態の鋼管杭と略同様のもので、杭鋼管 2の先端部、 即ち下端部に、 螺旋状の掘削刃部 3と撹拌部 4とセメントミルク供給口 5とを備 えている。  In the method of the second embodiment described below, a first steel pipe pile 1 as shown in FIGS. 9 and 10 and a second steel pipe pile 22 as a joint pile as shown in FIG. Used. The first steel pipe pile 1 is substantially the same as the steel pipe pile of the first embodiment, and has a spiral excavating blade 3, a stirring section 4, and a cement milk supply port 5 at the tip, that is, at the lower end of the pile steel pipe 2. It is equipped with.
なお、 杭鋼管 2の基端、 即ち上端は開口しているが、 先端は蓋部 6で閉じら れ、 先端掘削刃部 7が備えられ、 'また、 杭鋼管 2の長手方向中間部には螺旋翼 8 …が間隔的に設けられ、 多翼鋼管杭に形成されている。 この第 1鋼管杭 1は一つ の柱状地盤改良体の形成において、 1本使用される。  Although the base end of the pile steel pipe 2, that is, the upper end is open, the tip is closed by a lid part 6, and a tip drilling blade part 7 is provided. Spiral wings 8 are provided at intervals and are formed in a multi-wing steel pipe pile. The first steel pipe pile 1 is used in forming one columnar ground improvement body.
第 2鋼管杭 2 2は、 第 1 1図示すように、 同じく杭鋼管 2を備え、 杭鋼管 2 の長手方向中間部には、 側方に張り出す螺旋翼 8…が間隔的に設けられて、 多翼 鋼管杭に形成されている。 この第 2鋼管杭 2 2において、その杭鋼管 2の先端部、 即ち下端部には、 第 1鋼管杭 1と同様に掘削刃部 3、 撹拌部 4は備えられている 力 セメントミルク供給口は備えられていない。 また、 杭鋼管 2の先端、 即ち下 端は、 基端、 即ち上端と同様に、 蓋で閉じられることなく開放されている。 この 第 2鋼管杭 2 2は、 一つの柱状地盤改良体の形成において、 1本又は複数本使用 される。  As shown in FIG. 11, the second steel pipe pile 22 also includes the pile steel pipe 2, and spiral wings 8 projecting laterally are provided at intervals in a longitudinally intermediate portion of the pile steel pipe 2. A multi-wing steel pipe pile is formed. In the second steel pipe pile 22, the excavation blade 3 and the stirring part 4 are provided at the tip end, that is, the lower end of the pile steel pipe 2, similarly to the first steel pipe pile 1. Not provided. The tip, ie, the lower end, of the pile steel pipe 2 is open without being closed by the lid, like the base end, ie, the upper end. One or more of the second steel pipe piles 22 are used in forming one columnar ground improvement body.
柱状地盤改良体の構築は、 上記の第 1、 第 2の鋼管杭 1， 2 2を用いて、 例 えば次のようにして行う。 即ち、 まず、 第 1鋼管杭 1を、 第 1実施形態の場合と 同様に、 その上端を回転圧入用の杭打ち機の回転圧入モーター 1 0から下方に突 出する管継ぎ手 1 1と螺合連結した状態に杭打ち機にセットする。 The columnar ground improvement body is constructed using the first and second steel pipe piles 1 and 2 described above, for example, as follows. That is, first, as in the first embodiment, the first steel pipe pile 1 has its upper end protruding downward from the rotary press-fitting motor 10 of the rotary press-fitting pile driver. Set it on the pile driver in a state where it is screwed and connected with the fitting 1 to be put out.
しかる後、 第 1 2図に示すように、 杭打ち機で第 1鋼管杭 1を回転させなが ら地盤 1 5中に圧入して打ち込んでいく。 この回転圧入過程で、 第 1 3図に示す ように、 第 1鋼管杭 1の杭鋼管 2の先端部のセメントミルク供給口 5からセメン トミルク 1 7を噴出させる。 これにより、 第 1鋼管杭 1の先端の側方突出掘削刃 部 3で掘削された土砂 1 8にセメントミノレク 1 7が注入され、 これらが搅拌部 4 によって撹拌され、 土砂 1 8とセメントミルク 1 7との混合物 1 9が第 1鋼管杭 1の杭鋼管 2の外周側に形成されていく。  Thereafter, as shown in FIG. 12, the first steel pipe pile 1 is pressed into the ground 15 and driven into the ground 15 while rotating the first steel pipe pile 1 with a pile driving machine. In this rotary press-fitting process, as shown in FIG. 13, cement milk 17 is ejected from the cement milk supply port 5 at the tip of the pile steel pipe 2 of the first steel pipe pile 1. As a result, cement minolec 17 is injected into earth 18 excavated by the laterally protruding excavating blade 3 at the tip of the first steel pipe pile 1, and these are stirred by the stirring section 4, and the earth 18 and cement milk A mixture 19 with 17 is formed on the outer peripheral side of the pile steel pipe 2 of the first steel pipe pile 1.
こうして、 第 1 4図に示すように第 1鋼管杭 1の打込みを終えた後、 杭打ち 機の管継ぎ手と第 1鋼管杭 1との連結を解除し、 第 1 5図に示すように、 第 2鋼 管杭 2 2の上端に杭打ち機の管継ぎ手 1 1を螺合連結すると共に、 第 1鋼管杭 1 の上端に第 2鋼管杭 2 2の下端を連結して杭継ぎを行い、 そして、 第 1 5図に示 すように、 杭打ち機で第 1、 第 2の鋼管杭 1， 2 2を一体回転させながら地盤 1 5中に圧入して更に打ち進んでいき、 この回転圧入の過程においても、 第 1鋼管 杭 1の先端部のセメントミルク供給口からセメントミルクを嘖出させ、 土砂とセ メントミルクとの混合物 1 9を第 1、 第 2の鋼管杭 1， 2 2の各杭鋼管の外周側 に形成していく。 第 2鋼管杭 2 2の先端部にも、 第 1鋼管杭 1と同様に、 側方に 張り出す掘削刃 3と撹拌部 4とが備えられているので、 掘削と撹拌がしっかりと 行われる。  In this way, after the driving of the first steel pipe pile 1 has been completed as shown in FIG. 14, the connection between the pipe joint of the pile driver and the first steel pipe pile 1 is released, and as shown in FIG. The pipe joint 11 of the pile driver is screwed and connected to the upper end of the second steel pipe pile 2 2, and the lower end of the second steel pipe pile 2 2 is connected to the upper end of the first steel pipe pile 1 to carry out pile joining. Then, as shown in Fig. 15, the first and second steel pipe piles 1 and 2 are pressed into the ground 15 while being integrally rotated by the pile driver, and further driven into the ground. During the process, cement milk is discharged from the cement milk supply port at the tip of the first steel pipe pile 1, and a mixture 19 of soil and cement milk is supplied to the first and second steel pipe piles 1, 2. Formed on the outer peripheral side of each pile steel pipe. Similarly to the first steel pipe pile 1, the tip of the second steel pipe pile 2 is provided with the excavating blade 3 and the stirring section 4 that protrude to the side, so that the excavation and the stirring are performed firmly.
なお、 杭継ぎは、 第 1鋼管杭 1の上端部と第 2鋼管杭 2 2の下端部とをネジ 式で直接連結するようにしてもよいし、 継ぎ手部品を介してネジ式で連結するよ うにしてもよいし、 ネジによらず溶接等で連結するようにしてもよいし、 その他 の連結方式であってもよいし、 特段の制限はない。 要は、 第 2鋼管杭 2 2に対す る回転圧入力の付与によって第 1、 第 2の鋼管杭 1， 2 2が地中に一体的に打ち 込まれていき、 しかも、 第 2鋼管杭 2 2の上端部から供給したセメントミルクが 第 1鋼管杭 1の先端部のセメントミルク供給口 5から吐出される態様で連結され ていればよい。  For the pile joint, the upper end of the first steel pipe pile 1 and the lower end of the second steel pipe pile 22 may be directly connected with a screw type, or may be connected with a screw type via joint parts. The connection may be made by welding or the like without using screws, other connection methods may be used, and there is no particular limitation. The point is that the first and second steel pipe piles 1 and 22 are driven into the ground integrally by the application of rotational pressure input to the second steel pipe pile 22, and the second steel pipe pile 2 It is only necessary that the cement milk supplied from the upper end of 2 is connected so as to be discharged from the cement milk supply port 5 at the tip of the first steel pipe pile 1.
第 1、 第 2の鋼管杭 1， 2 2を杭継ぎをしながら地中深くに回転圧入してい く過程で、 第 1鋼管杭 1の先端のセメントミルク供給口へのセメントミルクのポ ンプによる圧送力が不足していくような場合には、 ポンプによるセメントミルク の圧送力を上昇させていくようにすることによって、 第 1鋼管杭 1の先端部のセ メントミルク供給口から充分な量のセメントミルクを供給し続けることができる。 During the process of rotating and press-fitting the first and second steel pipe piles 1 and 2 deep into the ground while joining them, the cement milk pouring into the cement milk supply port at the tip of the first steel pipe pile 1 If the pumping power of the pump is insufficient, the pumping power of cement milk by the pump should be increased to ensure that the cement milk supply port at the tip of the first steel pipe pile 1 The supply of cement milk can be continued.
こうして第 1、 第 2の鋼管杭 1， 2 2を杭継ぎして地中深くに打ち込み、 第 1銅管杭 1の先端が支持層 1 6に達したなら、 これら第 1 , 第 2の鋼管杭 1， 2 2を抜き去ることなくそのままの打ち込み状態にしておく。 そうすると、 一定期 間経過後に、 第 1、 第 2の鋼管杭 1， 2 2の各杭鋼管の外周側の、 掘削土砂とセ メントミルクとの混合物 1 9が固化し、第 1 8図に示すように、芯部に杭鋼管 2， 2を備えた柱状地盤改良体 2 0が地中に構築される。  In this way, the first and second steel pipe piles 1 and 2 are spliced and driven deep into the ground, and when the tip of the first copper pipe pile 1 reaches the support layer 16, these first and second steel pipe piles 1 Leave piles 1 and 2 in place without removing them. Then, after a certain period of time, the mixture 19 of excavated earth and sand and cement milk on the outer peripheral side of each of the first and second steel pipe piles 1 and 2 solidifies, as shown in Fig. 18 As described above, the columnar ground improvement body 20 having the pile steel pipes 2 and 2 at the core is constructed underground.
構築されたこの柱状地盤改良体 2 0にはその芯部に杭継ぎされた第 1、 第 2 の鋼管杭 1， 2 2の各杭鋼管が入っているので、 柱状地盤改良体 2 0によって大 きな支持力が得られると共に、 芯部のこれら杭鋼管によって耐力が大きなものに なる。  Since the constructed columnar ground improvement body 20 contains the first and second steel pipe piles 1 and 22 spliced to its core, the columnar ground improvement body 20 is large. In addition to providing a good bearing capacity, these pile steel pipes at the core increase the strength.
更にまた、 地盤 1 5の掘削、 セメントミルク 1 7の供給、 掘削した土砂 1 8 とセメントミルク 1 7の撹拌混合は、 第 1鋼管杭 1に備えられている掘削刃部 3 と撹拌部 4とセメントミルク供給口 5を用い、 鋼管杭 1， 2 2を回転させて打ち 込みながら行うようにしていること、 そして、 鋼管杭 1， 2 2の打ち込み後は、 鋼管杭 1， 2 2を地中に打ち込んだまま、 杭鋼管 2， 2の周囲のセメントミルク と土砂との混合物 1 9を固化させ、 杭鋼管 2， 2の周囲に柱状地盤改良体 2 0を 形成するようにしていることによって、 このような鋼管杭 1， 2 2と柱状地盤改 良体 2 0との複合構造を能率良く構築していくことができる。  Furthermore, the excavation of the ground 15, the supply of the cement milk 17, and the stirring and mixing of the excavated soil 18 and the cement milk 17 are performed by the excavating blade 3 and the stirring unit 4 provided in the first steel pipe pile 1. Use the cement milk supply port 5 to rotate and drive the steel pipe piles 1, 2 and 2, and after driving the steel pipe piles 1 and 2, place the steel pipe piles 1 and 2 underground. The mixture 19 of the cement milk and the earth and sand around the pile steel pipes 2 and 2 is solidified while being driven into the pile, and the columnar ground improvement body 20 is formed around the pile steel pipes 2 and 2, It is possible to efficiently construct such a composite structure of the steel pipe piles 1 and 22 and the columnar ground improvement body 20.
しかも、 使用する鋼管杭は、 第 1鋼管杭 1の 1本だけではなく、 継ぎ杭とし て第 2鋼管杭 2 2を用い、 これら第 1、 第 2の鋼管杭 1， 2 2を杭継ぎをしなが ら地中に回転圧入していくようにし、 その回転圧入の過程で、 第 1鋼管杭 1のセ メントミルク供給口 5から供給されるセメントミルクと、 掘削刃部 3で削られた 土砂 1 8とを撹拌部 4で撹拌し、 杭打ち後、 これら鋼管杭 1， 2 2を地中に打ち 込んだまま、 杭鋼管 2， 2の周囲のセメントミルクと土砂との混合物 1 9を固ィ匕 させ、 第 1， 第 2の鋼管杭 1， 2 2の周囲に柱状地盤改良体 2 0を形成するもの であるから、 地中深くまで柱状地盤改良体 2 0を形成することができて、 地中深 い位置に位置する支持'層 1 6による支持を受けることができ、 大きな支持力を得 ることができる。 Moreover, not only one steel pipe pile 1 but also the second steel pipe pile 22 is used as a joint pile, and the first and second steel pipe piles 1 and 2 are used for splicing. The cement milk supplied from the cement milk supply port 5 of the first steel pipe pile 1 was removed by the drilling blade 3 during the rotary press-fitting process. After mixing the soil 18 with the stirrer 4 and driving the pile, the mixture 19 of the cement milk and the soil around the pile steel pipes 2 and 2 is left while the steel pipe piles 1 and 2 are driven into the ground. Since the columnar ground improvement body 20 is formed around the first and second steel pipe piles 1 and 22, the columnar ground improvement body 20 can be formed deep into the ground. And deep underground Support 16 can be received by the support layer 16 located at a higher position, and a large supporting force can be obtained.
なお、 この第 2実施形態では、 第 1、 第 2の鋼管杭 1， 2 2を用いて杭継ぎ をすることで杭柱状地盤改良体 2 0を支持地盤である支持層 1 6に達するように した支持杭形式の杭柱状地盤改良体 2 0を形成する場合について示しているが、 第 1、 第 2の鋼管杭 1 , 2 2を用いて杭継ぎをすることで杭柱状地盤改良体 2 0 を支持地盤である支持層 1 6には達しないが地中深くまで至るようにした摩擦杭 形式の杭柱状地盤改良体 2 0を形成する場合に用いられてもよい。  In the second embodiment, the first and second steel pipe piles 1 and 22 are used to join the piles, so that the pile-column ground improvement body 20 reaches the support layer 16 which is the support ground. In this case, the first and second steel pipe piles 1 and 22 are used for splicing to improve the pile columnar ground improvement body 20. May be used to form a pile-column ground improvement body 20 in the form of a friction pile, which does not reach the support layer 16 as the support ground but extends deep into the ground.
また、 上記の実施形態では、 一つの柱状地盤改良体 2 0の形成に、 継ぎ杭と しての第 2鋼管杭 2 2を 1本用いた場合を示しているが、 1本の第 1鋼管杭 1と 2本以上の第 2鋼管杭 2 2を杭継ぎして一つの柱状地盤改良体 2 0を形成するよ うにしてもよい。 また、 上記の実施形態では、 第 1鋼管杭 1について、 その先端 部に側方張出しの掘削刃部 3と同じく側方張出しの撹拌部 4とを個別に備えさせ た例を示しているが、 側方張出しの掘削刃部に撹拌機能をもたせ、 両者を合わせ た撹拌機能付き掘削刃部を備えさせるようにしてもよい。 また、 第 2鋼管杭 2 2 について掘削刃部 3と撹拌部 4は省略されてもよく、 第 1、 第 2の鋼管杭 1， 2 2について、 中間の螺旋翼 8…は省略されてもよい。 産業上の利用可能性  Further, in the above embodiment, one column-shaped ground improvement body 20 is formed by using one second steel pipe pile 22 as a joint pile, but one first steel pipe pile 22 is used. The pile 1 and two or more second steel pipe piles 22 may be spliced to form one columnar ground improvement body 20. In the above embodiment, the first steel pipe pile 1 has an example in which a tip of the first steel pipe pile 1 is separately provided with a laterally extending excavation blade 3 and a laterally extending stirring part 4. It is also possible to provide an excavating blade part with a stirring function that combines the two with the extruding blade part that protrudes laterally. Also, the excavation blade 3 and the stirring section 4 may be omitted in the second steel pipe pile 22, and the intermediate spiral blades 8 may be omitted in the first and second steel pipe piles 1 and 22. . Industrial applicability
本発明の鋼管杭を用いた柱状地盤改良体の構築方法は、 以上のとおりのもの であるから、 支持力と耐力とをいずれも大きなものにすることができ、 それでい て、 能率良く構築することができる。 また、 中のかなり深い位置まで柱状地盤改 良体を形成することができて、 支持地盤からの支持力であるか、 地盤との外周摩 擦力による支持力であるかを問わず、 大きな支持力を得ることもできる。  Since the method for constructing the columnar ground improvement body using the steel pipe pile of the present invention is as described above, both the bearing capacity and the proof strength can be increased, and the construction can be performed efficiently. be able to. In addition, a columnar ground improvement body can be formed to a very deep position inside, and large support is provided regardless of whether it is the support force from the supporting ground or the outer peripheral frictional force with the ground. You can gain strength.

Claims

請 求 の 範 囲 The scope of the claims
1 . 杭鋼管の先端部に、 側方に張り出す掘削刃と、 同じく側方に張り出 す撹拌部と、 セメントミルク供給口とが設けられた鋼管杭を用い、 1. At the tip of the pile steel pipe, use a steel pipe pile provided with an excavating blade protruding laterally, a stirring part also protruding laterally, and a cement milk supply port.
この鋼管杭を回転させながら地中に打ち込んでいく過程で、 セメン トミルク供給口から供給されるセメントミルクと、 前記掘削刃で削られた土砂と を撹拌部によって混合し、  In the process of driving the steel pipe pile into the ground while rotating, the cement milk supplied from the cement milk supply port and the earth and sand shaved by the drilling blade are mixed by the stirring unit,
この鋼管杭を地中に打ち込んだまま、 杭鋼管の周囲のセメントミル クと土砂との混合物を固化させ、 杭銅管の周囲に柱状地盤改良体を形成すること を特徴とする鋼管杭を用いた柱状地盤改良体の構築方法。  While the steel pipe pile is being driven into the ground, a mixture of cement milk and earth and sand around the pile steel pipe is solidified to form a columnar ground improvement around the copper pipe pipe. Construction method of the improved columnar ground.
2 . 杭鋼管の先端部に、 側方に張り出す掘削刃部、 同じく側方に張り出 す撹拌部、 及び、 セメントミルク供給口が設けられた第 1鋼管杭と、 2. At the tip of the pile steel pipe, a first steel pipe pile provided with a digging blade part protruding laterally, a stirring part also protruding laterally, and a cement milk supply port,
継ぎ杭としての 1本又は複数本の第 2鋼管杭とを用い、 第 1、 第 2の鋼管杭を杭継ぎをしながら地中に回転圧入していく過 程で、前記第 1鋼管杭のセメントミルク供給口から供給されるセメントミルクと、 掘削刃部で削られた土砂とを撹拌部で撹拌し、 杭打ち後、 これら鋼管杭を地中に 打ち込んだまま、 杭鋼管の周囲のセメントミルクと土砂との混合物を固化させ、 第 1， 第 2の鋼管杭の周囲に柱状地盤改良体を形成することを特徴とする鋼管杭 を用いた柱状地盤改良体の構築方法。  Using one or more second steel pipe piles as joint piles, the first and second steel pipe piles are rotationally press-fitted into the ground while joining the piles. The cement milk supplied from the cement milk supply port and the earth and sand shaved by the excavation blade are stirred by the stirrer, and after pile driving, the cement milk around the pile steel pipe is driven while these steel pipe piles are driven into the ground. A method of constructing a columnar ground improvement using steel pipe piles, comprising solidifying a mixture of soil and sand to form a columnar ground improvement around the first and second steel pipe piles.
3 . 第 1、 第 2の鋼管杭を杭継ぎをしながら地中に回転圧入していく過 程で、 セメントミルク供給口へのセメントミルクのポンプによる圧送力を上昇さ せていく請求項 2に記載の鋼管杭を用いた柱状地盤改良体の構築方法。 3. The pumping power of the cement milk pump to the cement milk supply port is increased in the process of rotating and pressing the first and second steel pipe piles into the ground while joining the piles. A method for constructing a columnar ground improvement body using the steel pipe pile according to the above.
PCT/JP2003/003571 2003-03-25 2003-03-25 Method of building pillar-like ground improving body using steel pipe pile WO2004085748A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6471917A (en) * 1987-09-09 1989-03-16 Nippon Kokan Kk Soil cement composite pile and its construction
JPH07189249A (en) * 1993-12-27 1995-07-28 Chiyoda Koei Kk Method of burying construction of inverted conical-shaped multi-blade steel pipe pile
JP2001159130A (en) * 1999-12-01 2001-06-12 Yamashin Kogyo Kk Mechanical-agitation air cement-milk mixing force- feeding method and device
JP2002054132A (en) * 2000-08-10 2002-02-20 Kazutoshi Suzuki Soil improving method and soil improving apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6471917A (en) * 1987-09-09 1989-03-16 Nippon Kokan Kk Soil cement composite pile and its construction
JPH07189249A (en) * 1993-12-27 1995-07-28 Chiyoda Koei Kk Method of burying construction of inverted conical-shaped multi-blade steel pipe pile
JP2001159130A (en) * 1999-12-01 2001-06-12 Yamashin Kogyo Kk Mechanical-agitation air cement-milk mixing force- feeding method and device
JP2002054132A (en) * 2000-08-10 2002-02-20 Kazutoshi Suzuki Soil improving method and soil improving apparatus

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