JP2007255108A - Construction method for steel pipe pile - Google Patents

Construction method for steel pipe pile Download PDF

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Publication number
JP2007255108A
JP2007255108A JP2006082480A JP2006082480A JP2007255108A JP 2007255108 A JP2007255108 A JP 2007255108A JP 2006082480 A JP2006082480 A JP 2006082480A JP 2006082480 A JP2006082480 A JP 2006082480A JP 2007255108 A JP2007255108 A JP 2007255108A
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pile
ground
steel pipe
solidified material
pile body
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Hiroshi Kazama
広志 風間
Yasuhiro Shamoto
康広 社本
Hideyuki Mano
英之 真野
Miharu Asaka
美治 浅香
Takeyoshi Fukutake
毅芳 福武
Akira Ishikawa
明 石川
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Shimizu Construction Co Ltd
Shimizu Corp
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Shimizu Construction Co Ltd
Shimizu Corp
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Priority to JP2006082480A priority Critical patent/JP2007255108A/en
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  • Piles And Underground Anchors (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To obtain the effect of preventing liquefaction of peripheral ground, concurrently with an increase in the pulling strength of a steel pipe pile. <P>SOLUTION: An outflow port 13 of a solidification material 17 is preformed on the peripheral surface of a pile body 12 which is composed of a steel pipe. After the pile body is installed in the ground, the solidification material is pressurized and injected into the peripheral ground from the inside of the pile body through the outflow port, so as to form a diameter-enlarged section 20. Concurrently with that, soil is improved while the peripheral ground is compacted by injecting the solidification material in a pressurized state. A spiral blade 11, which is provided at least at the leading end of the pile body, is rotatively pressed into the ground. A packer 14 is mounted inside the outflow port, so that a space 18 for pressing in the solidification material is partitioned. A check valve is preprovided in the outflow port. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は杭の施工方法に係わり、特に、引き抜き強度に優れるばかりでなく周囲地盤に対する液状化防止効果も得られる鋼管杭の施工方法に関する。   The present invention relates to a method for constructing a pile, and more particularly to a method for constructing a steel pipe pile that not only has excellent pullout strength but also has an effect of preventing liquefaction on the surrounding ground.

図７（ａ）に示すように巨大地震時には建物１に大きな水平力Ｐ１が作用して建物１が浮き上がったり転倒することが想定される場合、（ｂ）に示すように建物１を支持地盤に対してアンカーしてその引き抜き抵抗力Ｐ２によって浮き上がりや転倒を防止する必要がある。
建物１を地盤に対してアンカーするためには適宜のアンカー手段（いわゆるグランドアンカー）を設置することが一般的に考えられるが、格別のアンカー手段を設置することに代えて杭に引き抜き抵抗力を持たせることも考えられている。
その場合、単なる支持杭では充分な引き抜き耐力を確保できないことが通常であることから、充分な引き抜き耐力を有する杭としてたとえば特許文献１に示されているような螺旋翼付きの鋼管杭を採用することが考えられている。
特開平８−２９１５１８号公報 As shown in FIG. 7A, when it is assumed that a large horizontal force P1 acts on the building 1 during a huge earthquake and the building 1 is lifted or falls, the building 1 is used as a supporting ground as shown in FIG. On the other hand, it is necessary to anchor and prevent lifting or falling by the pulling resistance force P2.
In order to anchor the building 1 to the ground, it is generally considered to install an appropriate anchor means (so-called ground anchor). However, instead of installing a special anchor means, pulling resistance is applied to the pile. It is also considered to have it.
In that case, since it is normal that a sufficient pulling strength cannot be secured with a mere support pile, a steel pipe pile with a spiral wing as shown in Patent Document 1 is employed as a pile having a sufficient pulling strength. It is considered.
JP-A-8-291518

ところで、図８に示すように建物１の支持地盤に液状化し易い液状化層２があるような場合には、巨大地震時に想定される地盤の液状化によって（ｂ）に示すように杭３の損傷が懸念され、その場合には建物を支持する杭の支持力が大幅に低下して建物の傾斜や崩壊など大きな地震被害は免れないことになる。
また、杭３の引き抜き耐力を増強するために特許文献１に示されるような螺旋翼付きの鋼管杭を採用した場合には、その鋼管杭を地盤に回転圧入する際に周囲地盤が螺旋翼によって切り込まれて乱されることに起因して原地盤の液状化に対する強度を寧ろ低下させてしまう懸念もあり、したがって、杭３の引き抜き耐力を増強させる目的で特許文献１に示されるような螺旋翼付き鋼管杭を単に採用することは合理的ではなく、好ましくないとも考えられている。 By the way, as shown in FIG. 8, when the support ground of the building 1 has a liquefied layer 2 that is liable to liquefy, the pile 3 can be There is concern about damage, and in that case, the bearing capacity of the piles that support the building is greatly reduced, and large earthquake damage such as inclination and collapse of the building is inevitable.
Moreover, when the steel pipe pile with a spiral wing as shown in Patent Document 1 is adopted to enhance the pulling-out strength of the pile 3, the surrounding ground is formed by the spiral wing when the steel pipe pile is rotationally press-fitted into the ground. There is also a concern that the strength against liquefaction of the original ground will be lowered due to being disturbed by being cut, and therefore a spiral as shown in Patent Document 1 for the purpose of enhancing the pull-out strength of the pile 3 Simply adopting a winged steel pipe pile is not reasonable and is considered undesirable.

上記事情に鑑み、本発明は充分な引き抜き耐力を持たせることができ、同時に周囲地盤に対する液状化防止効果も得られ、したがって杭の損傷を防止して建物の浮き上がりや転倒や崩壊を確実に防止することのできる合理的にして有効な鋼管杭の施工方法を提供することを目的とする。   In view of the above circumstances, the present invention can provide sufficient pulling strength, and at the same time, can also prevent liquefaction to the surrounding ground, thus preventing pile damage and reliably preventing the building from rising, falling or collapsing. It is an object of the present invention to provide a rational and effective steel pipe pile construction method that can be performed.

本発明は引き抜き強度に優れかつ周囲地盤に対する液状化防止効果が得られる鋼管杭の施工方法であって、鋼管からなる杭本体の周面に予め固化材の流出口を形成しておき、該杭本体を地盤中に設置した後、該杭本体の内部から前記流出口を通して周囲地盤に固化材を加圧注入して拡径部を形成するとともに、該固化材の加圧注入により周囲地盤を締め固めかつ地盤改良を行うことを特徴とする。   The present invention is a method for constructing a steel pipe pile that is excellent in pull-out strength and has an effect of preventing liquefaction with respect to the surrounding ground, wherein a solidified material outlet is previously formed on the peripheral surface of a pile body made of steel pipe, and the pile After the main body is installed in the ground, the solidified material is pressure-injected into the surrounding ground from the inside of the pile main body through the outlet to form an enlarged diameter portion, and the surrounding ground is tightened by the pressure-injecting of the solidified material. It is characterized by hardening and ground improvement.

本発明における杭本体としては、少なくとも先端に螺旋翼を設けたものを採用し、該杭本体を地盤中に設置する際には、該杭本体を回転させつつ地盤中に圧入することが考えられる。   As a pile main body in the present invention, a pile body provided with a spiral wing at least at the tip is adopted, and when the pile main body is installed in the ground, it is considered that the pile main body is pressed into the ground while rotating. .

本発明においては、流出口から固化材を周囲地盤に加圧注入するに際しては、流出口の内側に固化材の圧入空間を区画形成するためのパッカーを杭本体内に装着すると良い。   In the present invention, when the solidified material is pressure-injected into the surrounding ground from the outlet, a packer for defining a press-fitting space for the solidified material inside the outlet may be mounted in the pile body.

さらに、杭本体に形成した流出口には、該流出口から加圧注入した固化材が杭本体内に逆流することを防止するための逆止弁を予め設けておくことが好ましい。   Furthermore, it is preferable that a check valve for preventing the solidified material pressurized and injected from the outlet from flowing back into the pile body is provided in advance at the outlet formed in the pile body.

本発明によれば、杭本体の設置後にその内部から周囲地盤に加圧注入した固化材は最終的に固化して杭本体と一体の固化材塊となり、その固化材塊が拡径部となって杭の引き抜き耐力を充分に増強することができる。
しかも、固化材を周囲地盤に加圧注入することに伴ってその固化材の体積相当分の土砂が自ずと外方に押圧されていき、したがって周囲地盤は乱されることなく静的に締め固められていってそれによる締め固め効果が得られ、かつ固化材が固化することによる地盤改良効果が得られ、それらにより周囲地盤の密度および強度を自ずと高めることができて充分な液状化防止効果が得られる。 According to the present invention, after the pile main body is installed, the solidified material pressure-injected into the surrounding ground from the inside finally solidifies into a solidified material lump integral with the pile main body, and the solidified material lump becomes a diameter-enlarged portion. Thus, the pulling strength of the pile can be sufficiently increased.
In addition, as the solidified material is injected under pressure into the surrounding ground, the soil equivalent to the volume of the solidified material is naturally pressed outward, so the surrounding ground is statically compacted without being disturbed. Therefore, a compaction effect can be obtained, and a ground improvement effect can be obtained by solidifying the solidified material, and thereby the density and strength of the surrounding ground can be naturally increased, and a sufficient anti-liquefaction effect can be obtained. It is done.

また、杭本体に螺旋翼を設けておいてそれを地盤中に回転圧入すれば、杭本体の設置作業を容易に行うことができるし、螺旋翼による引き抜き耐力の増強効果や、螺旋翼を介して杭本体と拡径部とを強固に一体化させる効果が得られる。勿論、杭本体の回転圧入の際に原地盤が乱されたとしても、固化材を加圧注入することによる締め固め効果と固化材が固化することによる地盤改良効果により原地盤の乱れは自ずと補償されるから、地盤の液状化強度が損なわれることはない。   In addition, if the pile body is provided with a spiral wing and rotationally press-fitted into the ground, the pile body can be installed easily, and the effect of enhancing the pull-out strength by the spiral wing, Thus, the effect of firmly integrating the pile body and the enlarged diameter portion can be obtained. Of course, even if the original ground is disturbed during the rotary press-fitting of the pile body, the disturbance of the original ground is naturally compensated by the compaction effect by injecting the solidified material under pressure and the ground improvement effect by solidifying the solidified material. Therefore, the liquefaction strength of the ground is not impaired.

また、杭本体内にパッカーを装着して固化材の圧入空間を区画形成することにより、杭本体内の所望位置に固化材の圧入空間を確実かつ容易に形成することができる。   In addition, by installing a packer in the pile body and partitioning the press-fitting space for the solidified material, the press-fitted space for the solidified material can be reliably and easily formed at a desired position in the pile main body.

さらに、固化材の流出口に逆止弁を取り付けておけば、周囲地盤に加圧注入した固化材が杭本体内に逆流してしまうことを防止できるので注入圧を自ずと維持することができるし、パッカーを用いる場合にはそれを早期に撤去することも可能となる。   Furthermore, if a check valve is attached to the outlet of the solidification material, the solidification material injected under pressure into the surrounding ground can be prevented from flowing back into the pile body, so the injection pressure can be maintained naturally. If a packer is used, it can be removed early.

図１〜図６を参照して本発明の実施形態を説明する。
本実施形態は、たとえば図８に示したような液状化層２を有する地盤に対して、特許文献１に示されているような螺旋翼付きの鋼管杭を施工する際に適用するものであるが、上述したようにそのような螺旋翼付き鋼管杭を単に従来工法で施工することでは螺旋翼により周囲地盤が乱されて液状化強度が低下してしまうことも想定されることから、本実施形態ではそれを補償するために、螺旋翼付きの鋼管杭を回転圧入した後にその内側から周囲地盤に対して固化材１７（図３参照）を静的に加圧注入することによって螺旋翼と一体の拡径部２０（図４参照）を形成し、同時に周囲地盤に対する締め固めと地盤改良を行うことを主眼とするものである。 An embodiment of the present invention will be described with reference to FIGS.
This embodiment is applied when, for example, a steel pipe pile with a spiral wing as shown in Patent Document 1 is applied to the ground having the liquefied layer 2 as shown in FIG. However, as described above, simply constructing such a steel pipe pile with spiral wings by the conventional method is expected to disturb the surrounding ground by the spiral wings and reduce the liquefaction strength. In order to compensate for this, a steel pipe pile with a spiral blade is rotationally press-fitted and then solidified material 17 (see FIG. 3) is statically injected from the inside to the surrounding ground to integrate with the spiral blade. The main purpose is to form a large-diameter enlarged portion 20 (see FIG. 4) and simultaneously compact and improve the surrounding ground.

すなわち、本実施形態では、図１に示すように下端部に螺旋翼１１が形成されている鋼管を杭本体１２として採用するが、その下端部には予め固化材の流出口１３を形成しておく。流出口１３の径は４０〜５０ｍｍ程度で良く、杭本体１２の下端部の所望範囲に全周にわたって均等に形成しておく。   That is, in this embodiment, as shown in FIG. 1, a steel pipe in which a spiral blade 11 is formed at the lower end portion is adopted as the pile body 12. deep. The diameter of the outflow port 13 may be about 40 to 50 mm, and is formed uniformly over the entire circumference in a desired range of the lower end portion of the pile body 12.

上記の杭本体１２を地盤中に回転圧入して設置した後、図２（一部を破断して内部を示している）に示すようにその内部にパッカー１４を装着する。パッカー１４は、膨張収縮可能な柔軟な袋体１５を主体とするもので、その袋体１５を小さく折り畳んだ状態で拡径部２０を形成するべき予定位置の上部に位置させて配置した後、加圧管１６を通して袋体１５に水等の流体を加圧注入することで袋体１５を展開膨張させて杭本体１２の内面に押圧保持せしめることにより、杭本体１２の下端とこのパッカー１４との間に固化材１７を加圧注入するための圧入空間１８を区画形成するものである。また、袋体１５は環状とされていてその中心部には圧入空間１８に対して固化材１７を加圧注入するための注入管１９が挿通している。
このような構成のパッカー１４と注入管１９とを杭本体１２内に装着するためには、それらの全体を予め一体に組み付けておいてその全体を一括して杭本体１２内に挿入すれば良い。 After the pile main body 12 is rotationally press-fitted into the ground and installed, a packer 14 is attached to the inside as shown in FIG. 2 (partially broken to show the inside). The packer 14 is mainly composed of a flexible bag body 15 that can be inflated and shrunk. After the bag body 15 is folded in a small state, the packer 14 is placed on the upper portion of the planned position where the enlarged diameter portion 20 should be formed. By pressurizing and injecting fluid such as water into the bag body 15 through the pressurizing pipe 16, the bag body 15 is expanded and inflated and pressed and held on the inner surface of the pile body 12, whereby the lower end of the pile body 12 and the packer 14 are A press-fitting space 18 for pressurizing and injecting the solidifying material 17 therebetween is defined. The bag body 15 has an annular shape, and an injection tube 19 for pressurizing and injecting the solidified material 17 into the press-fit space 18 is inserted through the center of the bag body 15.
In order to mount the packer 14 and the injection pipe 19 having such a configuration in the pile main body 12, the whole may be assembled in advance and the whole may be inserted into the pile main body 12 in a lump. .

しかる後に、図３に示すように、地上部に設置した適宜の加圧注入手段（図示せず）から、注入管１９を通して圧入空間１８に固化材１７を適宜の注入圧によって供給し、それによって圧入空間１８から各流出口１３を通して固化材１７を周囲地盤に対して徐々に加圧注入していき、図４に示すように各流出口１３から加圧注入された固化材１７どうしが連続して杭本体１２の周囲全体を取り囲み、かつ螺旋翼１１全体を内包するまで、所望量の固化材１７を連続的に加圧注入する。
本実施形態で採用する固化材１７としては、周囲地盤への加圧注入時には充分な流動性と適度の粘性を有するとともに最終的には地盤中において自ずと固化して充分な強度を発現する周知のグラウト材を用いれば良く、たとえばセメントモルタルや地盤改良材としての各種の可塑状ゲル剤（たとえば特開２００３−１０５７４５号公報に開示されている可塑性グラウト等）が好適に採用可能である。 After that, as shown in FIG. 3, the solidification material 17 is supplied to the press-fitting space 18 through the injection pipe 19 from the appropriate pressure injection means (not shown) installed on the ground part with an appropriate injection pressure. The solidified material 17 is gradually injected into the surrounding ground through the outlets 13 from the press-fitting space 18, and the solidified materials 17 injected by pressure from the outlets 13 are continuously connected as shown in FIG. Then, a desired amount of the solidified material 17 is continuously injected under pressure until the entire periphery of the pile body 12 is surrounded and the entire spiral blade 11 is included.
The solidifying material 17 employed in the present embodiment is a well-known material that has sufficient fluidity and moderate viscosity when pressurized to the surrounding ground, and eventually solidifies itself in the ground to exhibit sufficient strength. A grout material may be used. For example, various plastic gel agents (for example, a plastic grout disclosed in Japanese Patent Application Laid-Open No. 2003-105745) as cement mortar and ground improvement material can be suitably used.

本実施形態の施工方法によれば、杭本体１２の内部から周囲地盤に加圧注入された固化材１７は最終的には固化して一体の固化材塊となり、その固化材塊は杭本体１２の下端部に自ずと一体化して拡径部２０となり、そのような拡径部２０が螺旋翼１１を介して杭本体１２の下端部に一体に形成されることから、螺旋翼１１のみによる場合に比べて引き抜き耐力が格段に増強されたものとなる。   According to the construction method of the present embodiment, the solidified material 17 pressure-injected into the surrounding ground from the inside of the pile main body 12 is finally solidified into an integrated solidified material lump, and the solidified material lump is the pile main body 12. In the case where only the spiral wing 11 is used, the enlarged diameter portion 20 is integrally formed with the lower end portion of the pile body, and the enlarged diameter portion 20 is formed integrally with the lower end portion of the pile body 12 via the spiral wing 11. Compared to this, the pulling strength is greatly increased.

しかも、固化材１７を周囲地盤に加圧注入することに伴い、その固化材１７の体積相当分の土砂が自ずと外方に押圧されていき、そのような固化材１７の加圧注入により周囲地盤に対する締め固め効果が得られ、かつ固化材１７が固化することによる地盤改良効果が得られ、それらの効果により地盤の密度および強度を自ずと高めることができる。
つまり、本工法における固化材１７の加圧注入工程は杭に対する拡径部２０の形成工程であると同時に、周囲地盤に対する締め固め工程および地盤改良工程でもあり、それにより杭の引き抜き耐力を充分に増強できるばかりでなく、周囲地盤の液状化に対する強度を相乗的に高めることができ、その結果、巨大地震時における液状化の発生やそれによる杭の損傷、その結果としての建物の浮き上がりや転倒や崩壊を確実に防止することができる。 In addition, as the solidified material 17 is pressure-injected into the surrounding ground, the earth and sand corresponding to the volume of the solidified material 17 is naturally pressed outward, and by the pressure injection of the solidified material 17 the surrounding ground. In addition, a ground improvement effect can be obtained by solidifying the solidifying material 17, and the density and strength of the ground can be naturally increased by these effects.
In other words, the pressurizing and injecting step of the solidifying material 17 in the present construction method is a forming step of the enlarged diameter portion 20 for the pile, and at the same time a compacting step and a ground improvement step for the surrounding ground, thereby sufficiently increasing the pulling strength of the pile. Not only can it be strengthened, but it can also synergistically increase the strength of the surrounding ground against liquefaction, resulting in the occurrence of liquefaction during large earthquakes and the resulting damage to piles, resulting in building lifts and falls. Collapse can be reliably prevented.

勿論、本実施形態の施工方法は、固化材１７を徐々に加圧注入することによって地盤をいわば静的に締め固めるものであるので原地盤を乱すことはないし、杭本体１２の回転圧入に際して生じた原地盤の乱れを固化材１７の加圧注入による締め固め効果と固化材の固化による地盤改良効果により補償して地盤の密度および強度を回復させることができ、構造的な安全性や信頼性を充分に高めることができる。   Of course, the construction method of the present embodiment does not disturb the original ground because the ground is statically compacted by gradually injecting the solidified material 17 under pressure, and occurs when the pile main body 12 is rotationally pressed. It is possible to recover the density and strength of the ground by compensating for the disturbance of the original ground by the compaction effect by the pressure injection of the solidification material 17 and the ground improvement effect by the solidification of the solidification material, structural safety and reliability Can be sufficiently increased.

そして、本実施形態の施工方法では、通常の螺旋翼付き鋼管杭を杭本体１２として採用して、それに流出口１３を形成すること以外は、汎用のパッカー１４と単なるグラウトポンプ等の通常の加圧注入手段をそのまま採用可能であって、特に複雑な機構や面倒な手間を必要とせず、したがって従来一般の鋼管杭の施工に際して本工法を実施してもさしたるコスト増にはならない。勿論、従来一般の鋼管杭の施工方法と、従来一般の固化材注入による地盤改良工法とをそれぞれ独立に実施する場合に比較すれば、大幅にコストを削減することができる。   In the construction method of the present embodiment, a general steel pack pile with a spiral wing is adopted as the pile body 12 and an outflow port 13 is formed on the pile body 12. The pressure injection means can be used as it is, and does not require a particularly complicated mechanism or troublesome labor. Therefore, this construction method does not increase the cost when the conventional steel pipe pile is constructed. Of course, the cost can be greatly reduced if compared with the case where the conventional general steel pipe pile construction method and the conventional general ground improvement method by solidifying material injection are carried out independently.

以上で本発明の一実施形態を説明したが、上記実施形態はあくまで好適な一例であって本発明は上記実施形態に限定されるものでは勿論なく、たとえば以下に列挙するような適宜の変更や応用が可能である。   Although one embodiment of the present invention has been described above, the above embodiment is merely a preferred example, and the present invention is not limited to the above embodiment. For example, appropriate changes such as those listed below are possible. Application is possible.

上記実施形態のように拡径部２０は杭本体１２の下端部に設けることが好ましく、通常はそれで充分であるが、拡径部２０を下端部に設けることに代えて、あるいそれに加えて、杭本体１２の中間部の所望位置にも同様の拡径部２０を形成することも考えられる。
図５は中間部にも拡径部２０を形成する場合の例を示すもので、この場合には杭本体１２の中間部の所望位置に流出口１３を形成しておき、その内側の上下にそれぞれパッカー１４を装着してそれらの間にも圧入空間１８を形成し、その圧入空間１８から周囲地盤に固化材１７を加圧注入すれば良い。その場合には、図６に示すように中間部に設ける拡径部２０の形成位置にも螺旋翼１１を設けておくことも考えられる。
また、必要であれば、杭本体１２の全長にわたって連続的に拡径部２０を形成することも考えられる。その場合は、杭本体１２の全長にわたって流出口１３を形成しておき、杭本体１２の内部全体を圧入空間１８とすれば良く、必要であれば杭本体１２の全長にわたって一連の螺旋翼１１を設けておくことも考えられる。 It is preferable to provide the enlarged diameter portion 20 at the lower end portion of the pile main body 12 as in the above embodiment, which is usually sufficient, but instead of providing the enlarged diameter portion 20 at the lower end portion, in addition to that, It is also conceivable to form the same enlarged diameter portion 20 at a desired position in the intermediate portion of the pile body 12.
FIG. 5 shows an example in which the enlarged diameter portion 20 is formed also in the intermediate portion. In this case, the outflow port 13 is formed at a desired position of the intermediate portion of the pile body 12 and Each of the packers 14 is mounted, a press-fit space 18 is formed between them, and the solidified material 17 may be pressurized and injected from the press-fit space 18 to the surrounding ground. In that case, as shown in FIG. 6, it is also conceivable to provide the spiral blade 11 at the formation position of the enlarged diameter portion 20 provided in the intermediate portion.
Further, if necessary, it is conceivable to form the enlarged diameter portion 20 continuously over the entire length of the pile body 12. In that case, the outlet 13 may be formed over the entire length of the pile body 12, and the entire interior of the pile body 12 may be used as a press-fit space 18, and if necessary, a series of spiral blades 11 may be formed over the entire length of the pile body 12. It is also possible to provide it.

上記実施形態において圧入空間１８を形成するために用いたパッカー１４は、拡径部２０が形成された後には撤去すれば良いが、その必要がなければそのまま残置して埋め殺してしまうことでも良い。いずれにしてもパッカーの形式や種類は任意であって、膨張収縮可能な構成の格別のパッカーを用いることに代えてたとえばモルタル等を要所に充填して圧入空間を形成したり、杭本体１２の内部にパッカーとして機能するような部材や機構を予め組み込んでおくことも考えられる。   The packer 14 used to form the press-fit space 18 in the above embodiment may be removed after the enlarged diameter portion 20 is formed, but if it is not necessary, it may be left as it is and buried. . In any case, the type and type of the packer are arbitrary, and instead of using a special packer having a configuration capable of expanding and contracting, for example, mortar or the like is filled in a key point to form a press-fit space, or the pile body 12 It is also conceivable to incorporate in advance a member or mechanism that functions as a packer.

上記各実施形態では杭本体１２の周面に形成した単なる開口（孔）を流出口１３としたが、そこに適宜の逆止弁を設けることも考えられる。
すなわち、上記実施形態では周囲地盤に加圧注入した固化材１７の固化がある程度進行するまでは注入圧を維持する必要があり、したがってそれまではパッカー１４を撤去することはできないが、流出口１３に逆流を防止するための逆止弁を設けておけば自ずと注入圧が維持されるからパッカー１４の撤去を早期に行うことが可能となる。その逆止弁としては、流出口１３の外側に弁体を外方に向かって開くように取り付け、その弁体が固化材１７の加圧注入時には自ずと外方に自由に開かれ、逆流が生じる事態となった際には流出口１３が弁体により自ずと塞がれる構成のものが考えられるが、あるいは地上部から開閉操作するシャッタの如き構成の逆止弁を設けておくことも考えられる。 In each of the above embodiments, a simple opening (hole) formed in the peripheral surface of the pile body 12 is used as the outflow port 13, but it is also conceivable to provide an appropriate check valve there.
That is, in the above embodiment, it is necessary to maintain the injection pressure until solidification of the solidified material 17 injected under pressure to the surrounding ground has progressed to some extent. Therefore, the packer 14 cannot be removed until then, but the outlet 13 If a check valve for preventing backflow is provided in the tank, the injection pressure is naturally maintained, so that the packer 14 can be removed at an early stage. As the check valve, the valve body is attached to the outside of the outflow port 13 so as to open outward, and the valve body is automatically opened to the outside freely when the solidifying material 17 is injected under pressure, and a backflow occurs. In the event of a situation, a configuration in which the outlet 13 is naturally closed by a valve body is conceivable, or a check valve having a configuration such as a shutter that opens and closes from the ground part may be provided.

本発明は上記実施形態のように螺旋翼付きの鋼管杭の施工方法として有効であるが、それに限るものでもなく、単なる鋼管杭を施工する際にも同様に適用可能であり、その場合には杭本体１２として螺旋翼１１のない単なるストレートな鋼管を用いれば良いことはいうまでもない。   The present invention is effective as a method for constructing a steel pipe pile with spiral wings as in the above embodiment, but is not limited thereto, and can be similarly applied when constructing a simple steel pipe pile. Needless to say, a simple steel pipe without the spiral blade 11 may be used as the pile body 12.

本発明の実施形態である施工方法を示す図であって、杭本体を地盤中に設置した状態を示す図である。It is a figure which shows the construction method which is embodiment of this invention, Comprising: It is a figure which shows the state which installed the pile main body in the ground. 同、パッカーを装着して圧入空間を形成した状態を示す図である。It is a figure which shows the state which mounted | wore with the packer and formed the press-fit space. 同、圧入空間から周囲地盤に固化材を加圧注入しつつある状態を示す図である。It is a figure which shows the state which is carrying out the pressure injection of the solidification material from the press-fit space to the surrounding ground. 同、拡径部を形成した状態を示す図である。It is a figure which shows the state which formed the enlarged diameter part similarly. 同、変形例を示す図である。It is a figure which shows a modification similarly. 同、さらなる変形例を示す図である。It is a figure which shows the further modification same as the above. 地震時における建物の浮き上がり挙動を示す図である。It is a figure which shows the floating behavior of the building at the time of an earthquake. 支持地盤の液状化による杭の損傷の状況を示す図である。It is a figure which shows the condition of the damage of the pile by liquefaction of a support ground.

符号の説明Explanation of symbols

１１ 螺旋翼
１２ 杭本体
１３ 流出口
１４ パッカー
１５ 袋体
１６ 加圧管
１７ 固化材
１８ 圧入空間
１９ 注入管
２０ 拡径部 DESCRIPTION OF SYMBOLS 11 Spiral wing 12 Pile main body 13 Outlet 14 Packer 15 Bag body 16 Pressurization pipe 17 Solidification material 18 Press-fit space 19 Injection pipe 20 Expanded part

Claims (4)

引き抜き強度に優れかつ周囲地盤に対する液状化防止効果が得られる鋼管杭の施工方法であって、
鋼管からなる杭本体の周面に予め固化材の流出口を形成しておき、
該杭本体を地盤中に設置した後、
該杭本体の内部から前記流出口を通して周囲地盤に固化材を加圧注入して拡径部を形成するとともに、該固化材の加圧注入により周囲地盤を締め固めかつ地盤改良を行うことを特徴とする鋼管杭の施工方法。 It is a construction method of a steel pipe pile that is excellent in pull-out strength and has the effect of preventing liquefaction on the surrounding ground,
The outlet of the solidified material is formed in advance on the peripheral surface of the pile body made of steel pipe,
After installing the pile body in the ground,
The solidified material is pressurized and injected from the inside of the pile main body to the surrounding ground through the outlet to form an enlarged diameter portion, and the surrounding ground is compacted and the ground is improved by pressure injection of the solidifying material. The steel pipe pile construction method. 請求項１記載の鋼管杭の施工方法であって、
杭本体の少なくとも先端には螺旋翼を設けておき、該杭本体を地盤中に設置する際には、該杭本体を回転させつつ地盤中に圧入することを特徴とする鋼管杭の施工方法。 It is a construction method of the steel pipe pile according to claim 1,
A method for constructing a steel pipe pile, wherein a spiral wing is provided at least at a tip of a pile body, and when the pile body is installed in the ground, the pile body is pressed into the ground while rotating. 請求項１または２記載の鋼管杭の施工方法であって、
流出口から固化材を周囲地盤に加圧注入するに際しては、流出口の内側に固化材の圧入空間を区画形成するためのパッカーを杭本体内に装着することを特徴とする鋼管杭の施工方法。 It is the construction method of the steel pipe pile according to claim 1 or 2,
A method for constructing a steel pipe pile, characterized in that, when the solidified material is injected into the surrounding ground from the outlet, the packer is mounted inside the pile body to form a press-in space for the solidified material inside the outlet. . 請求項１〜３のいずれかに記載の鋼管杭の施工方法であって、
杭本体に形成した流出口には、該流出口から加圧注入した固化材が杭本体内に逆流することを防止するための逆止弁を予め設けておくことを特徴とする鋼管杭の施工方法。 It is the construction method of the steel pipe pile in any one of Claims 1-3,
Construction of a steel pipe pile characterized in that a check valve is provided in advance at the outlet formed in the pile main body to prevent the solidified material pressurized and injected from the outlet from flowing back into the pile main body. Method.
JP2006082480A 2006-03-24 2006-03-24 Construction method for steel pipe pile Pending JP2007255108A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2042272A2 (en) 2007-09-28 2009-04-01 Nidec Sankyo Corporation Industrial robot with cam-actuated gripper
JP2011026911A (en) * 2009-07-29 2011-02-10 Kfc Ltd Construction method of rotary penetrating pile
JP2011026910A (en) * 2009-07-29 2011-02-10 Kfc Ltd Rotary penetrating pile
KR101072215B1 (en) * 2008-08-29 2011-10-10 윤인병 pile constructing method for reinforcing ends and the pile constructed by this
JP5728747B1 (en) * 2014-07-09 2015-06-03 国立大学法人 東京大学 Liquefaction countermeasures for existing buried pipes
JP2015110892A (en) * 2013-11-07 2015-06-18 ライト工業株式会社 Reinforcement material and method for establishing the same
JP2015187379A (en) * 2014-03-11 2015-10-29 新日鐵住金株式会社 Steel pipe pile and construction method for the same
JP6014288B1 (en) * 2015-04-07 2016-10-25 隆夫 中野 Rotating method of steel pipe pile with tip wing
CN108005061A (en) * 2018-01-31 2018-05-08 广西盛虎金属制品有限公司 Spinning expands the construction method of head steel-pipe pile
CN110468838A (en) * 2019-08-31 2019-11-19 云南永宏工程机械租赁有限公司 A kind of pile top for club-footed pile carrier pile driving construction
CN112663606A (en) * 2020-12-23 2021-04-16 江苏东合南岩土科技股份有限公司 Construction method of concrete expanded head prestress anti-pulling anchor rod
CN114457833A (en) * 2022-02-21 2022-05-10 三峡大学 Pile foundation structure capable of being strengthened on coral sand and method

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5393610A (en) * 1977-01-26 1978-08-16 Teruo Koi Method of making bulb part for base pile* and said base pipe
JPS55101946U (en) * 1978-12-30 1980-07-16
JPS61246421A (en) * 1985-04-24 1986-11-01 Toshio Matsuda Foundation construction work
JPS63114719A (en) * 1986-10-31 1988-05-19 Nkk Corp Foundation pile
JPH11140869A (en) * 1997-11-10 1999-05-25 Nkk Corp Screwed-in type steel pipe pile with wing
JP2000352046A (en) * 1999-06-11 2000-12-19 Raito Kogyo Co Ltd Pile creating construction method
JP2003293366A (en) * 2002-04-04 2003-10-15 Nippon Steel Corp Foundation structure of windbreak wall
JP2004211543A (en) * 2004-03-24 2004-07-29 Kyokado Eng Co Ltd Method of improving soft ground

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5393610A (en) * 1977-01-26 1978-08-16 Teruo Koi Method of making bulb part for base pile* and said base pipe
JPS55101946U (en) * 1978-12-30 1980-07-16
JPS61246421A (en) * 1985-04-24 1986-11-01 Toshio Matsuda Foundation construction work
JPS63114719A (en) * 1986-10-31 1988-05-19 Nkk Corp Foundation pile
JPH11140869A (en) * 1997-11-10 1999-05-25 Nkk Corp Screwed-in type steel pipe pile with wing
JP2000352046A (en) * 1999-06-11 2000-12-19 Raito Kogyo Co Ltd Pile creating construction method
JP2003293366A (en) * 2002-04-04 2003-10-15 Nippon Steel Corp Foundation structure of windbreak wall
JP2004211543A (en) * 2004-03-24 2004-07-29 Kyokado Eng Co Ltd Method of improving soft ground

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2042272A2 (en) 2007-09-28 2009-04-01 Nidec Sankyo Corporation Industrial robot with cam-actuated gripper
KR101072215B1 (en) * 2008-08-29 2011-10-10 윤인병 pile constructing method for reinforcing ends and the pile constructed by this
JP2011026911A (en) * 2009-07-29 2011-02-10 Kfc Ltd Construction method of rotary penetrating pile
JP2011026910A (en) * 2009-07-29 2011-02-10 Kfc Ltd Rotary penetrating pile
JP2015110892A (en) * 2013-11-07 2015-06-18 ライト工業株式会社 Reinforcement material and method for establishing the same
JP2015187379A (en) * 2014-03-11 2015-10-29 新日鐵住金株式会社 Steel pipe pile and construction method for the same
JP5728747B1 (en) * 2014-07-09 2015-06-03 国立大学法人 東京大学 Liquefaction countermeasures for existing buried pipes
JP6014288B1 (en) * 2015-04-07 2016-10-25 隆夫 中野 Rotating method of steel pipe pile with tip wing
CN108005061A (en) * 2018-01-31 2018-05-08 广西盛虎金属制品有限公司 Spinning expands the construction method of head steel-pipe pile
CN110468838A (en) * 2019-08-31 2019-11-19 云南永宏工程机械租赁有限公司 A kind of pile top for club-footed pile carrier pile driving construction
CN112663606A (en) * 2020-12-23 2021-04-16 江苏东合南岩土科技股份有限公司 Construction method of concrete expanded head prestress anti-pulling anchor rod
CN114457833A (en) * 2022-02-21 2022-05-10 三峡大学 Pile foundation structure capable of being strengthened on coral sand and method
CN114457833B (en) * 2022-02-21 2024-03-12 三峡大学 Pile foundation structure capable of being reinforced on coral sand and method

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