JPH0583684B2 - - Google Patents
Info
- Publication number
- JPH0583684B2 JPH0583684B2 JP61241916A JP24191686A JPH0583684B2 JP H0583684 B2 JPH0583684 B2 JP H0583684B2 JP 61241916 A JP61241916 A JP 61241916A JP 24191686 A JP24191686 A JP 24191686A JP H0583684 B2 JPH0583684 B2 JP H0583684B2
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- pile
- soil cement
- pipe pile
- tip
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 78
- 239000010959 steel Substances 0.000 claims description 78
- 239000004568 cement Substances 0.000 claims description 59
- 239000002689 soil Substances 0.000 claims description 53
- 230000002093 peripheral effect Effects 0.000 claims description 14
- 239000002131 composite material Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000005452 bending Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 208000010392 Bone Fractures Diseases 0.000 description 3
- 206010017076 Fracture Diseases 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Piles And Underground Anchors (AREA)
Description
【発明の詳細な説明】
[産業上の利用分野]
本発明は、鋼管杭を用いた、ソイルセメント工
法によるソイルセメント合成杭に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a soil-cement composite pile using a soil-cement method using steel pipe piles.
[従来の技術]
ソイルセメント工法においては、一般に走行車
上に取付けたオーガー又は撹拌ロツドを電動力等
で地盤に、じ込んで穿孔しながら、オーガー又は
撹拌ロツドの先端中央からセメント系硬化剤から
なるセメントミルク等の注入材を出し、撹拌翼等
で強制撹拌を行ないながらソイルセメント柱を形
成する。また、ソイルセメント工法による支持杭
は、このソイルセメント柱のセメント硬化前に鋼
管杭を建込むようにしたものである。[Prior art] In the soil cement method, an auger or stirring rod mounted on a running vehicle is generally driven into the ground using electric power, etc., and while drilling, a cement-based hardener is poured from the center of the tip of the auger or stirring rod. An injection material such as cement milk is poured out, and a soil cement column is formed while being forcibly stirred with a stirring blade or the like. In addition, the support pile using the soil cement construction method is one in which the steel pipe pile is erected before the cement of the soil cement column hardens.
[発明が解決しようとする問題点]
上記のような支持杭は、杭先端閉塞、水平抵抗
及び摩擦抵抗の点で、次のような問題があつた。[Problems to be Solved by the Invention] The above-mentioned support piles have the following problems in terms of pile tip blockage, horizontal resistance, and frictional resistance.
(1) 杭先端閉塞に関する問題点
鋼管杭先端部の内周面とソイルセメントとの付
着力は主として粘着力であるため、その付着力と
変位との関係は第5図に示すように脆性的であ
り、ソイルセメントの剛性が鋼管の剛性に対して
非常に小さい場合、進行性破壊を生ずるおそれが
ある。このため、鋼管杭が大径(例えば径が1000
mm以上)になつて必要付着力が大きくなると、そ
の閉塞効果に対する信頼性が低下する。(1) Problems related to pile tip blockage Since the adhesive force between the inner peripheral surface of the steel pipe pile tip and soil cement is mainly adhesive force, the relationship between the adhesive force and displacement is brittle as shown in Figure 5. If the stiffness of the soil cement is very small compared to the stiffness of the steel pipe, progressive fracture may occur. For this reason, steel pipe piles with large diameters (for example, diameters of 1000
mm or more) and the required adhesion force increases, the reliability of the occlusion effect decreases.
また、仮りに鋼管杭内周面とソイルセメントと
の付着が靱性的であつたとしても、支持杭先端の
完全な閉塞効果を得るためには、管内極限抵抗力
Fが先端地盤の極限支持力Rpを上まわる必要が
ある。 Furthermore, even if the adhesion between the inner circumferential surface of the steel pipe pile and the soil cement is strong, in order to obtain a complete blockage effect at the tip of the support pile, the ultimate resistance force F in the pipe must be equal to the ultimate bearing capacity of the ground at the tip. It is necessary to exceed Rp.
即ち、F≧Rp
Rp=A×qd ……[1]
F=f×U×L ……[2]
但し
A:杭先端面積A=π/4D2
qd:杭先端で支持する単位面積あたりの極限支
持力度
f:鋼管内周面とソイルセメントとの単位面積
あたりの付着力
U:杭周長U=πD
L:必要根入長
D:杭径
ここで先端地盤が砂礫で、N値が50以上の場合
の試算を行うと、qd≧600ton/m2、ソイルセメン
ト強度quが100Kg/cm2以上が保証されていたとし
ても、fはたかだか2Kg/cm2程度であり、従つて
閉塞効果を保つための必要根入れ長Lは、上記
[1]、[2]式より
L≧7.5D
と長大なものとなる。 That is, F≧Rp Rp=A×q d …[1] F=f×U×L …[2] However, A: Pile tip area A=π/4D 2 q d : Unit area supported by the pile tip Ultimate bearing capacity per unit area f: Adhesion force per unit area between the inner peripheral surface of the steel pipe and soil cement U: Pile circumference U = πD L: Required penetration length D: Pile diameter Here, the tip ground is gravel, and the N value A trial calculation in the case where is 50 or more shows that even if q d ≧ 600 ton/m 2 and soil cement strength q u is guaranteed to be 100 Kg/cm 2 or more, f is at most about 2 Kg/cm 2 , and the conventional Accordingly, the required penetration length L to maintain the blocking effect is long, L≧7.5D, from formulas [1] and [2] above.
(2) 水平抵抗に関する問題点
鋼管杭とソイルセメントとの一体性に不安があ
るため、鋼管杭自身のもつせん断抵抗力及び曲げ
耐力のみしか期待できなかつた。(2) Problems related to horizontal resistance Due to concerns about the integrity of the steel pipe pile and soil cement, only the shear resistance and bending strength of the steel pipe pile itself could be expected.
(3) 摩擦抵抗に関する問題点
鋼管杭の摩擦抵抗は、設計にあたつては第7図
に示すように直径Dsのソイルセメント柱1の外
周ではなく、直径Dpの鋼管杭3の外周を用い、
かつ周面摩擦力は鋼管杭3と軟弱層5間の値を用
いて求めていた。即ち、従来のセメント工法によ
る支持杭は、通常の地盤では鋼管杭3の抗体耐力
及びソイルセメントの強度が十分活用されていな
かつた。(3) Problems related to frictional resistance In designing the frictional resistance of steel pipe piles, the outer periphery of the steel pipe pile 3 with a diameter of Dp is used instead of the outer periphery of the soil cement column 1 with a diameter of Ds, as shown in Figure 7. ,
In addition, the circumferential surface friction force was determined using the value between the steel pipe pile 3 and the soft layer 5. That is, in the conventional cement construction method, the bearing capacity of the steel pipe pile 3 and the strength of the soil cement are not fully utilized in normal ground.
以上のように、従来のソイルセメント工法によ
る支持杭は、ソイルセメント工法を単なる杭の設
置工法の1つとして位置づけており、ソイルセメ
ントのもつ強度等の利点の有効利用には、関心が
払われていなかつた。 As mentioned above, the support piles made using the conventional soil cement method are positioned as simply one of the pile installation methods, and there is little interest in effectively utilizing the advantages of soil cement, such as its strength. I wasn't there.
本発明は、ソイルセメント工法によつて支持杭
を造成するに際して、ソイルセメントと鋼管杭と
の一体性を高めることにより、前記問題点を解決
することを目的としたものである。 The present invention aims to solve the above problems by improving the integrity of soil cement and steel pipe piles when constructing support piles using the soil cement construction method.
[問題点を解決するための手段]
本発明のソイルセメント合成杭は、地盤にソイ
ルセメント柱を形成し、該ソイルセメント柱に鋼
管杭を建込んでなる杭において、少なくとも2.5
mmの高さの突条を、前記鋼管杭の外周面のほぼ全
長にわたつて管軸と交差する方向に複数設けると
ともに、前記鋼管杭の直径をDpとした場合に該
鋼管杭の先端から少なくとも0.5Dpの範囲の鋼管
杭内周面、又は該鋼管杭の先端から少なくとも
0.5Dpの範囲の鋼管杭内周面および該鋼管杭の頭
部内周面にも管軸と交差する方向に複数設けるよ
うにしたものである。[Means for Solving the Problems] The soil cement composite pile of the present invention has a soil cement column formed in the ground and a steel pipe pile built into the soil cement column.
A plurality of protrusions with a height of mm are provided in a direction intersecting the pipe axis over almost the entire length of the outer peripheral surface of the steel pipe pile, and when the diameter of the steel pipe pile is Dp, from the tip of the steel pipe pile at least The inner peripheral surface of the steel pipe pile within a range of 0.5Dp, or at least from the tip of the steel pipe pile
A plurality of pipes are provided on the inner circumferential surface of the steel pipe pile in the range of 0.5Dp and on the inner circumferential surface of the head of the steel pipe pile in a direction intersecting the pipe axis.
[作用]
第1の発明により、鋼管杭の周面摩擦力が増大
すると共に杭先端部内周面における鋼管杭とソイ
ルセメントとの付着力を高め、杭先端部の閉塞効
果を向上させる。[Function] According to the first invention, the peripheral surface friction force of the steel pipe pile increases, and the adhesion between the steel pipe pile and the soil cement on the inner circumferential surface of the pile tip is increased, thereby improving the blocking effect of the pile tip.
また第2の発明では、第1の発明の作用に加
え、杭頭部内周面における鋼管杭とソイルセメン
トとの付着力を十分大きくし、水平力に対する抵
抗力を強める。 Moreover, in the second invention, in addition to the effect of the first invention, the adhesion force between the steel pipe pile and the soil cement on the inner circumferential surface of the pile head is sufficiently increased to strengthen the resistance against horizontal force.
[実施例]
第1図aは本発明実施例の模式図で、bは一部
を断面で示したそのB部拡大図、cは同じくC部
の拡大図である。図において、1は地盤に形成さ
れたソイルセメント柱、3はこのソイルセメント
柱1内に建込まれた鋼管杭で、その外周面にはb
図にその一部を示すようにほぼ全長に亘つて突条
4が設けられており、さらに先端部(実施例では
先端から1.0Dpの範囲)にはc図に示すように内
周面にも突条4aが設けられている。なお、6は
支持層である。[Example] Fig. 1a is a schematic diagram of an embodiment of the present invention, b is an enlarged view of part B, partially shown in cross section, and c is an enlarged view of part C. In the figure, 1 is a soil cement column formed in the ground, 3 is a steel pipe pile built inside this soil cement column 1, and the outer peripheral surface has b
As shown in part in the figure, a protrusion 4 is provided over almost the entire length, and also on the inner peripheral surface at the tip (in the example, within a range of 1.0 Dp from the tip) as shown in figure c. A protrusion 4a is provided. Note that 6 is a support layer.
第6図は表面に突条のない平鋼板と突条のある
鋼板に対するソイルセメントの付着性状を模式的
に示した線図である。図から明らかなように、突
条のある鋼板に対するソイルセメントの付着力は
大きいばかりでなく、変位に対する靱性がきわめ
て良好であることがわかる。これに対して平鋼板
とソイルセメントとの付着力は小さく、その上脆
性的である。 FIG. 6 is a diagram schematically showing the adhesion properties of soil cement to a flat steel plate without ridges on the surface and a steel plate with ridges. As is clear from the figure, the adhesion of soil cement to the steel plate with ridges is not only strong, but also has extremely good toughness against displacement. On the other hand, the adhesion force between the flat steel plate and soil cement is small and, moreover, it is brittle.
このような特性から、内外周面が平坦な鋼管杭
においては、進行的に破壊が進行するため杭先端
部近傍の付着性状のみしか閉塞効果に寄与せず、
したがつて閉塞効果に対しての信頼性が低い。一
方、本発明に係る支持杭は、第1図に示すように
鋼管杭外周面のほぼ全長に亘つて突条4を設ける
と共に、先端部には内周面にも突条4aを設けた
ので、ソイルセメントの付着力及び靱性が大幅に
向上するため進行性破壊が生ぜす、したがつて完
全な閉塞効果を得ることができる。 Due to these characteristics, in steel pipe piles with flat inner and outer circumferential surfaces, fracture progresses progressively, so only the adhesion near the pile tip contributes to the blockage effect.
Therefore, reliability regarding the occlusion effect is low. On the other hand, in the support pile according to the present invention, as shown in FIG. 1, a protrusion 4 is provided over almost the entire length of the outer circumference of the steel pipe pile, and a protrusion 4a is also provided on the inner circumference at the tip. , the adhesion and toughness of soil cement are greatly improved, resulting in progressive fracture, so a complete occluding effect can be obtained.
いま、ソイルセメント強度qu=100Kg/cm2が保
証できるとすれば、本発明に係る鋼管杭3と中詰
めソイルセメント2との付着力は、突条4aを設
けたことにより、付着強度f=30Kg/cm2が期待さ
れ、前記[1]、[2]式から、
L≧0.5Dp
となり、鋼管杭3の先端部の完全な閉塞を保つの
に僅か0.5Dp程度の根入長で、すなわち鋼管杭先
端部内周面には0.5Dp以上の範囲に突条を設けれ
ば十分であることがわかる。 Now, if soil cement strength q u =100Kg/cm 2 can be guaranteed, the adhesive force between the steel pipe pile 3 and the filling soil cement 2 according to the present invention will be increased by the adhesive strength f due to the provision of the ridges 4a. = 30Kg/cm 2 is expected, and from equations [1] and [2] above, L≧0.5Dp, and the penetration length of only about 0.5Dp is required to maintain complete blockage of the tip of the steel pipe pile 3. In other words, it can be seen that it is sufficient to provide a protrusion on the inner circumferential surface of the tip of the steel pipe pile in a range of 0.5Dp or more.
第2図aは鋼管杭の外周面のほぼ全長と頭部内
周面に突条を設けた例の模式図、bはそのA部の
拡大図、cはB部の拡大図である。本実施例にお
いては、鋼管杭3の外周面のほぼ全長に亘つて突
条4を設けると共に、杭頭部(実施例では頂部か
ら4.0Dpの範囲)内周面に突条4aを設けたもの
である。 FIG. 2a is a schematic diagram of an example in which protrusions are provided on almost the entire length of the outer circumferential surface of a steel pipe pile and on the inner circumferential surface of the head, FIG. 2b is an enlarged view of section A, and FIG. 2c is an enlarged view of section B. In this example, a protrusion 4 is provided over almost the entire length of the outer peripheral surface of the steel pipe pile 3, and a protrusion 4a is provided on the inner peripheral surface of the pile head (in the example, within a range of 4.0 Dp from the top). It is.
上記のような本実施例においては、鋼管杭3の
杭頭部内周面と中詰めソイルセメント2との付着
力は十分に大きく、このためソイルセメント2と
鋼管杭3が水平力を受けたとき、一体として抵抗
することができる。したがつて、中詰めソイルセ
メントの曲げ剛性、曲げ強度、せん断剛性、せん
断強度を向上させることができるので、従来のソ
イルセメント工法による支持杭に比べて、大きな
水平抵抗を得ることができる。 第3図aは本発
明のさらに別の実施例を示す模式図で、b,c,
dはそれぞれのA部,B部,C部の拡大図であ
る。本実施例においては、鋼管杭3の外周面のほ
ぼ全長に亘つて突条4を設けると共に、杭頭部及
び先端部の内周面にそれぞれ突条4aを設けたも
のである。 In this embodiment as described above, the adhesion force between the inner circumferential surface of the pile head of the steel pipe pile 3 and the filling soil cement 2 is sufficiently large, so that the soil cement 2 and the steel pipe pile 3 are subjected to horizontal force. When, we can resist as one. Therefore, the bending rigidity, bending strength, shear rigidity, and shear strength of the filled soil cement can be improved, so it is possible to obtain greater horizontal resistance than support piles made using the conventional soil cement construction method. FIG. 3a is a schematic diagram showing still another embodiment of the present invention;
d is an enlarged view of each section A, B, and C. In this embodiment, a protrusion 4 is provided over almost the entire length of the outer circumferential surface of the steel pipe pile 3, and protrusions 4a are provided on the inner circumferential surfaces of the head and tip of the pile, respectively.
本実施例においては、ソイルセメント1と鋼管
杭3間の付着強度S2が、軟弱層とソイルセメント
1間の周面摩擦強度S1に対してS1×Ds/Dpより
大となるようにソイルセメント1の配合及び強度
を選ぶことにより、軟弱層とソイルセメント間が
すべつて周面摩擦力がその強度S1に達するまで、
ソイルセメント1と鋼管杭3間はすべらないこと
になる。即ち、鋼管杭3の周面摩擦耐力を求める
とき、設計にあたつて、支持杭の強度は従来前記
のように鋼管杭3の外周πDpを用いていたが、本
発明においてはソイルセメント柱1の外周πDsを
用いることができるので、摩擦耐力を従来より大
きくとることができる(第7図参照)。 In this example, the adhesion strength S 2 between the soil cement 1 and the steel pipe pile 3 is set to be larger than S 1 ×D s /Dp with respect to the peripheral surface friction strength S 1 between the soft layer and the soil cement 1. By selecting the composition and strength of soil cement 1 in
There will be no slippage between the soil cement 1 and the steel pipe pile 3. That is, when determining the circumferential friction resistance of the steel pipe pile 3, the strength of the support pile was conventionally used as the outer circumference πDp of the steel pipe pile 3 as described above, but in the present invention, the outer circumference πDp of the steel pipe pile 3 was used as the strength of the support pile. Since the outer circumference πDs can be used, the friction resistance can be made larger than before (see Fig. 7).
本発明に係る鋼管杭は、例えば熱圧延によつて
両面に突条4,4aを設けた鋼板をスパイラル状
に巻き、継目を溶接して両面突条付き円筒を形成
し、また一方の面に突条4を設けた鋼板を突条4
を外側にしてスパイラル状に巻き継目を溶接して
円筒を形成し、この円筒の上部若しくは下部又は
上下に両面突条付き円筒を溶接したものである。
実施例では第4図に示すように突条4の高さhを
2.5mm以上、間隔lを40mm以下とした(なお第4
図には片面突条付き鋼板を示してある)。 The steel pipe pile according to the present invention is made by spirally winding a steel plate with ridges 4, 4a on both sides by hot rolling, welding the seams to form a cylinder with ridges on both sides, and forming a cylinder with ridges on one side. The steel plate provided with the protrusion 4 is the protrusion 4.
A cylinder is formed by welding a spirally wound seam on the outside, and a cylinder with protrusions on both sides is welded to the upper or lower part or upper and lower parts of this cylinder.
In the example, the height h of the protrusion 4 is set as shown in FIG.
2.5 mm or more, and the interval l was 40 mm or less (the fourth
(The figure shows a steel plate with ridges on one side.)
ここで、突条の高さhを2.5mm以上としたのは、
この突条高さにおいてソイルセメントの強度が一
定の値(例えばqu=100Kg/cm2)が保証されると
き、鋼管杭3と中詰めソイルセメント2との十分
な付着強度(f=30Kg/cm2)が期待できるからで
ある。しかし、圧延上4mmを越える高さの突条を
形成することは困難なことから、実際には最大で
も4mm程度にするのが望ましい。 Here, the height h of the protrusion is set to 2.5 mm or more because
When the strength of the soil cement is guaranteed to be a certain value (for example, q u = 100 Kg/cm 2 ) at this ridge height, there is sufficient adhesion strength between the steel pipe pile 3 and the filling soil cement 2 (f = 30 Kg/cm 2 ). cm 2 ) can be expected. However, since it is difficult to form a protrusion with a height exceeding 4 mm during rolling, it is actually desirable to have a height of about 4 mm at most.
また、突条の間隔で40mm以下としたのは、熱圧
延で突条を設けた場合、2.5mm以上4mm程度まで
の高さの突条で突条間隔が40mm以下であれば、実
験上十分な付着強度が得られたからである。 In addition, the reason for setting the spacing between the protrusions to be 40 mm or less is that when the protrusions are provided by hot rolling, if the protrusions have a height of 2.5 mm to 4 mm and the spacing between the protrusions is 40 mm or less, it is sufficient in experiments. This is because a good adhesion strength was obtained.
なお、上記の鋼管の製造方法、突条の形成方法
及び突条4の形状、高さ、間隔はその一例を示す
ものであつて、他の製造方法及び形成方法によつ
てもよく、突条4の形状、高さ、間隔等もこれに
限定するものではない。 It should be noted that the above-mentioned method for manufacturing the steel pipe, method for forming the protrusions, and shape, height, and spacing of the protrusions 4 are merely examples, and other manufacturing methods and forming methods may be used. The shape, height, interval, etc. of 4 are not limited to these.
[発明の効果]
第1の発明によれば、鋼管杭とソイルセメント
柱の付着力が高まり、鋼管杭に作用した荷重は、
鋼管杭の外面突条を介してソイルセメント柱に伝
達され周辺地盤へ伝達される。同時に、鋼管杭先
端部の内面突条により閉塞効果が向上するので、
荷重の支持力をソイルセメント柱径で設定でき
る。従つて、鋼管杭の耐力とソイルセメント柱の
強度を十分に生かし、かつ鋼管杭の根入れも鋼管
杭の直径の半分程度で済ませられる合成杭を得る
ことができる。[Effect of the invention] According to the first invention, the adhesion between the steel pipe pile and the soil cement column is increased, and the load acting on the steel pipe pile is
It is transmitted to the soil cement column via the external ridges of the steel pipe pile, and then to the surrounding ground. At the same time, the inner protrusion at the tip of the steel pipe pile improves the blocking effect.
Load bearing capacity can be set by soil cement column diameter. Therefore, it is possible to obtain a composite pile that makes full use of the bearing capacity of the steel pipe pile and the strength of the soil cement column, and also allows the steel pipe pile to be embedded in approximately half the diameter of the steel pipe pile.
第2の発明によれば、第1の発明の効果に加
え、杭頭部の内面突条により、水平力に対する曲
げ剛性、曲げ強度、せん断剛性、せん断強度が向
上し、水平力に対する抵抗力の大きな合成杭を得
ることができる。 According to the second invention, in addition to the effects of the first invention, the internal protrusions of the pile head improve the bending rigidity, bending strength, shear rigidity, and shear strength against horizontal forces, and the resistance force against horizontal forces is improved. Large synthetic piles can be obtained.
第1図aは本発明実施例の構成を示す模式図、
b,cはそれぞれa図のB部,C部の拡大断面
図、第2図aは鋼管杭の外周面のほぼ全長と頭部
内周面に突条を設けた例の模式図、b,cはそれ
ぞれa図のA部、B部の拡大断面図、第3図aは
本発明のさらに別の実施例の模式図、b,c,d
はそれぞれa図のA部,B部,C部の拡大断面
図、第4図aは片面突条付き鋼管杭の展開図、b
はその下面図、第5図は鋼管杭先端部内周面とソ
イルセメントとの付着力と変位との関係を示す線
図、第6図は平鋼板、突条付鋼板とソイルセメン
トとの付着力と変位との関係を示す線図、第7図
はソイルセメント工法による支持杭の概要を示す
模式図である。
1……ソイルセメント柱、3……鋼管杭、4,
4a……突条。
FIG. 1a is a schematic diagram showing the configuration of an embodiment of the present invention,
b and c are enlarged sectional views of parts B and C in Figure a, respectively; Figure 2 a is a schematic diagram of an example in which protrusions are provided on almost the entire length of the outer circumferential surface of a steel pipe pile and on the inner circumferential surface of the head; b, c is an enlarged sectional view of part A and part B of Fig. 3a, Fig. 3a is a schematic diagram of still another embodiment of the present invention, b, c, d
Figure 4 is an enlarged cross-sectional view of parts A, B, and C in Figure a, Figure 4 a is a developed view of a steel pipe pile with a ridge on one side, and b
is a bottom view, Figure 5 is a diagram showing the relationship between the adhesion force and displacement between the inner peripheral surface of the tip of the steel pipe pile and soil cement, and Figure 6 is the adhesion force between the flat steel plate, the steel plate with ridges, and soil cement. Fig. 7 is a schematic diagram showing the outline of a support pile using the soil cement construction method. 1...Soil cement column, 3...Steel pipe pile, 4,
4a... Projection.
Claims (1)
セメント柱に鋼管を建込んでなる杭において、少
なくとも2.5mmの高さの突条を、前記鋼管杭の外
周面のほぼ全長にわたつて管軸と交差する方向に
複数設けるとともに、前記鋼管杭の直径をDpと
した場合に該鋼管杭の先端から少なくとも0.5Dp
の範囲の鋼管杭内周面にも管軸と交差する方向に
複数設けたことを特徴とするソイルセメント合成
杭。 2 地盤にソイルセメント柱を形成し、該ソイル
セメント柱に鋼管を建込んでなる杭において、少
なくとも2.5mmの高さの突条を、前記鋼管杭の外
周面のほぼ全長にわたつて管軸と交差する方向に
複数設けるとともに、前記鋼管杭の直径をDpと
した場合に該鋼管杭の先端から少なくとも0.5Dp
の範囲の鋼管杭内周面および該鋼管杭の頭部内周
面にも管軸と交差する方向に複数設けたことを特
徴とするソイルセメント合成杭。[Scope of Claims] 1. In a pile formed by forming a soil cement column on the ground and installing a steel pipe into the soil cement column, a protrusion with a height of at least 2.5 mm is provided along approximately the entire length of the outer peripheral surface of the steel pipe pile. A plurality of steel pipe piles are provided in the direction intersecting the pipe axis, and when the diameter of the steel pipe pile is Dp, at least 0.5Dp from the tip of the steel pipe pile.
A soil cement composite pile characterized in that a plurality of steel pipe piles are provided on the inner circumferential surface of the steel pipe pile in a direction intersecting the pipe axis. 2. In a pile formed by forming a soil cement column in the ground and erecting a steel pipe into the soil cement column, a protrusion with a height of at least 2.5 mm is connected to the pipe axis over almost the entire length of the outer circumferential surface of the steel pipe pile. A plurality of them are provided in the intersecting direction, and when the diameter of the steel pipe pile is Dp, at least 0.5Dp from the tip of the steel pipe pile.
A soil cement composite pile characterized in that a plurality of steel pipe piles are provided on the inner peripheral surface of the steel pipe pile in the range and on the inner peripheral surface of the head of the steel pipe pile in a direction intersecting the pipe axis.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24191686A JPS6397711A (en) | 1986-10-14 | 1986-10-14 | Soil cement composite pile |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24191686A JPS6397711A (en) | 1986-10-14 | 1986-10-14 | Soil cement composite pile |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6397711A JPS6397711A (en) | 1988-04-28 |
JPH0583684B2 true JPH0583684B2 (en) | 1993-11-29 |
Family
ID=17081457
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24191686A Granted JPS6397711A (en) | 1986-10-14 | 1986-10-14 | Soil cement composite pile |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6397711A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009114845A (en) * | 2007-10-16 | 2009-05-28 | Jfe Steel Corp | Friction pile |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101071122B1 (en) * | 2002-09-30 | 2011-10-07 | 미타니 세키산 가부시키가이샤 | Internal excavation method through pile and foundation pile structure |
WO2012118186A1 (en) * | 2011-03-02 | 2012-09-07 | 新日本製鐵株式会社 | Connecting structure for connecting steel pipe pile and steel outer pipe |
CN102587360A (en) * | 2012-03-22 | 2012-07-18 | 沙焕焕 | Large-diameter strong composite pile |
DE102012020871A1 (en) * | 2012-10-24 | 2014-04-24 | Repower Systems Se | Composite structure for a pile foundation for anchoring a tower, foundation and jacket for a wind turbine, and wind turbine |
JP6610183B2 (en) * | 2015-11-10 | 2019-11-27 | ジャパンパイル株式会社 | Ready-made pile |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5376505A (en) * | 1976-12-17 | 1978-07-07 | Kawasaki Steel Co | Method of treating placed tip of steel pipe for pile |
JPS55119822A (en) * | 1979-03-09 | 1980-09-13 | Tenotsukusu:Kk | Method for reinforcing bearing capacity of concrete pile and reinforcing member thereof |
JPS5817849A (en) * | 1981-07-25 | 1983-02-02 | バブコツク日立株式会社 | Ball mill |
-
1986
- 1986-10-14 JP JP24191686A patent/JPS6397711A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5376505A (en) * | 1976-12-17 | 1978-07-07 | Kawasaki Steel Co | Method of treating placed tip of steel pipe for pile |
JPS55119822A (en) * | 1979-03-09 | 1980-09-13 | Tenotsukusu:Kk | Method for reinforcing bearing capacity of concrete pile and reinforcing member thereof |
JPS5817849A (en) * | 1981-07-25 | 1983-02-02 | バブコツク日立株式会社 | Ball mill |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009114845A (en) * | 2007-10-16 | 2009-05-28 | Jfe Steel Corp | Friction pile |
Also Published As
Publication number | Publication date |
---|---|
JPS6397711A (en) | 1988-04-28 |
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