JP2015187344A - Buried structure of prefabricated pile and burying method of prefabricated pile - Google Patents

Buried structure of prefabricated pile and burying method of prefabricated pile Download PDF

Info

Publication number
JP2015187344A
JP2015187344A JP2014064845A JP2014064845A JP2015187344A JP 2015187344 A JP2015187344 A JP 2015187344A JP 2014064845 A JP2014064845 A JP 2014064845A JP 2014064845 A JP2014064845 A JP 2014064845A JP 2015187344 A JP2015187344 A JP 2015187344A
Authority
JP
Japan
Prior art keywords
pile
ready
diameter
pile hole
hole
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.)
Granted
Application number
JP2014064845A
Other languages
Japanese (ja)
Other versions
JP6400315B2 (en
Inventor
木谷　好伸
Yoshinobu Kitani
好伸 木谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitani Sekisan Co Ltd
Original Assignee
Mitani Sekisan Co Ltd
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=54429692&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=JP2015187344(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Mitani Sekisan Co Ltd filed Critical Mitani Sekisan Co Ltd
Priority to JP2014064845A priority Critical patent/JP6400315B2/en
Publication of JP2015187344A publication Critical patent/JP2015187344A/en
Application granted granted Critical
Publication of JP6400315B2 publication Critical patent/JP6400315B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Piles And Underground Anchors (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)

Abstract

PROBLEM TO BE SOLVED: To omit the work for holding a prefabricated pile on the ground until a cement milk is solidified and transmit a load from the prefabricated pile to the ground in a stepped part, and thereby reinforce a supporting force.SOLUTION: A prefabricated pile 1 has an upper large diameter part 2 of an outer diameter D01 and a small diameter part of a diameter D02(D02<D01) in the lower part, and a boundary is made a stepped part 4 (a). A pile hole 20 excavates a pile hole small diameter part 21 by a predetermined diameter D1(D02<D1<D01) and forms an upper large diameter part 24 of a diameter D2(D01<D2) through a stepped part 23 on the upper part (b). The prefabricated pile 1 is inserted before or after injecting a cement milk in the pile hole 20 or concurrently. The prefabricated pile 1 maintains a state in which a lower surface (stepped part 4) of the upper large diameter part 2 is locked on the upper surface of the stepped part 23 of the pile hole 20, and the prefabricated pile 1 is buried in the pile hole 20. When the cement milk is solidified, a foundation pile structure 30 is constituted (c).

Description

本発明は、杭穴内に既製杭を埋設する既製杭の埋設構造及び既製杭の埋設方法に関する。   The present invention relates to a buried structure of a ready-made pile in which a ready-made pile is buried in a pile hole and a method of burying the ready-made pile.

地上の構造物を受ける基礎杭で、杭穴内に既製杭を埋設して構成する場合、先端支持力は主に既製杭の下端の面積により発揮されていた。また、表面積の大きさにより、摩擦支持力が発揮されるので、既製杭の途中に大径部や突起を設ける場合もあった。また、上端部では地震などにより水平荷重を受けるので、これに抗するために上端部の断面積を大きくするために大径にする工夫もなされていた（特許文献１〜３）。当然、杭穴は既製杭の最大外径に合わせて掘削していた。
また、事後に既製杭が杭穴内で沈下しないように、既製杭と杭穴内の間にはセメントミルクなどを注入して固化させていた。 In the foundation pile that receives the structure on the ground, when the ready-made pile is buried in the pile hole, the tip support force is mainly exerted by the area of the lower end of the ready-made pile. Moreover, since the frictional support force is exhibited depending on the size of the surface area, a large-diameter portion or a protrusion may be provided in the middle of the ready-made pile. In addition, since the upper end portion receives a horizontal load due to an earthquake or the like, in order to resist this, a device has been devised to increase the diameter in order to increase the cross-sectional area of the upper end portion (Patent Documents 1 to 3). Naturally, the pile hole was excavated according to the maximum outer diameter of the ready-made pile.
Moreover, cement milk etc. were inject | poured and solidified between the ready-made pile and the pile hole so that a ready-made pile might not sink in a pile hole after the fact.

特開２００６−１３２１００号公報JP 2006-132100 A 特開２００８−４５３２７号公報JP 2008-45327 A 特開２００６−１１８２１５号公報JP 2006-118215 A

杭穴を掘削して既製杭を納めるプレボーリング工法では、既製杭の外側の表面積で摩擦支持力を発揮させるために、既製杭の外面が直接に杭穴壁の土に接することなく、土より固化強度が高いと考えられてるセメントミルクなどを介して、既製杭は埋設されていた。
また、杭穴の底には、既製杭が杭穴底の土の上に直接に埋設されずに、根固め部という富配合のセメントミルクを充填して、この根固め部の中に既製杭の下端部を埋設して、より大きな先端支持力を発揮させる工夫が成されている。 In the pre-boring method in which the pile is drilled and the ready-made pile is placed, the outer surface of the ready-made pile does not directly touch the soil of the pile-hole wall, Ready-made piles were buried via cement milk, which is considered to have high solidification strength.
In addition, the bottom of the pile hole is not filled with the ready-made pile directly on the soil at the bottom of the pile hole, but is filled with cement milk of a rich blend called a root consolidation part. The device has been devised to embed the lower end portion of the base plate so as to exert a greater tip support force.

したがって、この場合には、セメントミルクなどが固化するまでは、何らかの手段で地上で既製杭を吊った状態で、支える必要があった。通常は、既製杭の埋設が完了した後に、１〜５時間ほど要し、それまで、杭打ち機で既製杭を保持する必要があった。
また。既製杭の埋設作業時に既製杭を支えていた杭打ち機は、作業効率上、敷地内の他の既製杭の埋設作業に移動させる必要があったので、杭打ち機を開放するためには、通常は、既製杭の突起部や何らかの突起治具を設けて、ワイヤーなどで既製杭に引っかけ、そのワイヤーを地上で仮固定して、既製杭を保持していた。そして、セメントミルクなどが固化して、既製杭が沈下しない状態になったならば、ワイヤーを取り外していた。よって、このワイヤーなどの着脱作業が煩雑となっていた。
また、地上からは地中（杭穴内）のセメントミルクなどの固化状態を完全には把握できないため、後期の都合上、次工程に進むために少しでも早く次工程に進むべく、既製杭の仮固定を外した場合、あるいは充分な固化時間を経ても何らかの不慮の原因による場合、セメントミルクなどの固化に不足が生じることもあった。この場合には既製杭が仮固定位置から沈下するおそれがあった。 Therefore, in this case, it was necessary to support the ready-made piles suspended on the ground by some means until the cement milk or the like is solidified. Usually, it took about 1 to 5 hours after the completion of the laying of the ready-made pile, and until then, it was necessary to hold the ready-made pile with a pile driving machine.
Also. The pile driver that supported the ready-made pile at the time of burying the ready-made pile had to be moved to other pre-made pile burial work in the site for work efficiency, so in order to open the pile driver, Usually, the protrusion part of a ready-made pile and some protrusion jig | tool were provided, it hooked on the ready-made pile with a wire etc., the wire was temporarily fixed on the ground, and the ready-made pile was hold | maintained. And when cement milk solidified and the ready-made pile was not settled, the wire was removed. Therefore, the attaching / detaching work of the wire or the like has been complicated.
In addition, since it is not possible to completely understand the solidification state of cement milk etc. in the ground (in the pile hole) from the ground, for the convenience of the latter period, the temporary pile of the ready-made piles should be advanced as soon as possible to proceed to the next process. When the fixing is removed or due to some unforeseen cause even after a sufficient solidification time, the cement milk or the like may be insufficiently solidified. In this case, the ready-made piles may sink from the temporarily fixed position.

本発明は、既製杭の大径部の下面を杭穴の段差部に係止して埋設したので、前記問題点を解決した。   In the present invention, since the lower surface of the large-diameter portion of the ready-made pile is embedded in the stepped portion of the pile hole, the above-mentioned problems have been solved.

即ちこの発明は、外径Ｄ０１の上部大径部を有し、該大径部の下方を径Ｄ０２（Ｄ０２＜Ｄ０１）の小径部としてなる既製杭を、杭穴内に埋設して、以下のように構成することを特徴とする既製杭の埋設構造である。
(1) 前記杭穴は、杭穴小径部が所定径Ｄ１（Ｄ１＜Ｄ０）で形成され、前記杭穴小径部の所定高さから上方に径Ｄ２（Ｄ１＜Ｄ２）の杭穴大径部を形成し、前記杭穴小径部の上端に段差部を形成する。
(2) 前記既製杭の大径部下面外周部を前記杭穴の段差部上面に係止した状態で、前記杭穴内に前記既製杭を埋設する。 That is, in the present invention, a pre-made pile having an upper large diameter portion having an outer diameter D01 and a lower diameter portion having a diameter D02 (D02 <D01) below the large diameter portion is embedded in a pile hole as follows. It is a buried structure of a ready-made pile characterized by comprising.
(1) The pile hole has a pile hole small diameter portion having a predetermined diameter D1 (D1 <D0), and a pile hole large diameter portion having a diameter D2 (D1 <D2) upward from a predetermined height of the pile hole small diameter portion. And a step portion is formed at the upper end of the small diameter portion of the pile hole.
(2) The ready-made pile is embedded in the pile hole in a state in which the outer peripheral portion of the lower surface of the large-diameter portion of the ready-made pile is locked to the upper surface of the stepped portion of the pile hole.

また、前記において、杭穴の段差部を、地盤強度が大きな深さ位置に設定することを特徴とする既製杭の埋設構造である。   Moreover, in the above, it is the ready-made pile embedding structure characterized by setting the level | step-difference part of a pile hole to the depth position where ground strength is large.

また、他の発明は、杭穴内に、既製杭を以下のように埋設してして基礎杭構造を構築することを特徴とした既製杭の埋設方法である。
(1) 前記既製杭を、外径Ｄ０１の上部大径部を有し、該上部大径部の下方を径Ｄ０２（Ｄ０２＜Ｄ０１）の小径部として構成する。
(2) 所定径Ｄ１（Ｄ０２＜Ｄ１＜Ｄ０１）で杭穴小径部を必要深さまで掘削する。
(3) 前記杭穴小径部を所定深さまで掘削した後に、あるいは、前記杭穴小径部の下端部の掘削と同時に、前記杭穴小径部の所定深さから上方に、径Ｄ２（Ｄ０１＜Ｄ２）の上部大径部を掘削し、前記杭穴小径部の上端に段差部を形成する。
(4) 前記杭穴内にセメントミルクなどの固化材料を注入すると前後して、あるいは同時に、前記既製杭を挿入する。
(5) 前記既製杭の大径部下面が前記杭穴の段差部上面に係止した状態を維持して、前記杭穴内に前記既製杭を埋設する。
(6) 前記固化材料が固化したならば、基礎杭構造を構成する。 Another invention is a method for embedding a ready-made pile characterized in that a foundation pile structure is constructed by embedding a ready-made pile in a pile hole as follows.
(1) The ready-made pile has an upper large diameter portion having an outer diameter D01, and a lower portion of the upper large diameter portion is configured as a small diameter portion having a diameter D02 (D02 <D01).
(2) Excavate the small diameter part of the pile hole to the required depth with a predetermined diameter D1 (D02 <D1 <D01).
(3) After excavating the small diameter portion of the pile hole to a predetermined depth or simultaneously with excavation of the lower end portion of the small diameter portion of the pile hole, the diameter D2 (D01 <D2) upward from the predetermined depth of the small diameter portion of the pile hole ) Is excavated, and a step portion is formed at the upper end of the small-diameter portion of the pile hole.
(4) Insert the ready-made pile before, after or simultaneously with injection of a solidified material such as cement milk into the pile hole.
(5) The ready-made pile is embedded in the pile hole while maintaining a state where the lower surface of the large-diameter portion of the ready-made pile is locked to the upper surface of the stepped portion of the pile hole.
(6) If the solidified material is solidified, a foundation pile structure is constructed.

この発明は、既製杭の上部大径部の下面、すなわち下に向けた段差部を、杭穴の上方に向けた段差部に係止するので、地上で、既製杭を保持しなくても杭穴内で既製杭は安定して保持される効果がある。したがって、特別な治具を用意して途上で既製杭を保持する必要がなく、かつ杭打ち機の効率的な運用ができる効果がある。
また、既製杭の段差部と杭穴の段差部が直接に接するので、根固め部での先端支持力に加えて、段差部で既製杭から地盤へ荷重を伝達できる。したがって、段差部では摩擦支持力以上の大きな支持力を発揮できる効果がある。 In this invention, the lower surface of the upper large-diameter portion of the ready-made pile, that is, the stepped portion directed downward is locked to the stepped portion directed upward of the pile hole, so that the pile can be obtained without holding the ready-made pile on the ground. There is an effect that the ready-made pile is stably held in the hole. Therefore, it is not necessary to prepare a special jig and hold the ready-made pile on the way, and the pile driving machine can be efficiently operated.
Moreover, since the step part of a ready-made pile and the step part of a pile hole contact | connect directly, in addition to the front-end | tip support force in a root-hardening part, a load can be transmitted from a ready-made pile to a ground in a step part. Therefore, there is an effect that the step portion can exhibit a large support force that is greater than the friction support force.

この発明の実施例で、（ａ）は既製杭、（ｂ）は杭穴、（ｃ）は既製杭を杭穴に納めた状態を表す。In the embodiment of the present invention, (a) represents a ready-made pile, (b) represents a pile hole, and (c) represents a state in which the ready-made pile is placed in the pile hole. この発明の他の実施例で、（ａ）は他の既製杭、（ｂ）は杭穴、（ｃ）は既製杭を杭穴に納めた状態を表す。In another embodiment of the present invention, (a) shows another ready-made pile, (b) shows a pile hole, and (c) shows a state where the ready-made pile is placed in the pile hole.

図面に基づきこの発明の実施形態を説明する。   Embodiments of the present invention will be described with reference to the drawings.

１．既製杭１の構成 1. Configuration of ready-made pile 1

この発明の実施に使用する既製杭１は、上部が、径Ｄ０１の上部大径部２で、上部大径部２の下方に径Ｄ０の小径部３が、段差部４を介して連続している（図１（ａ））。段差部４は径Ｄ０１からＤ０２へ徐々に径が変化する部分で、正面視で、θ１＝４５度程度になっている。なお、θ１は、
θ１＝０〜６０°
程度の角度で調整できる。
また、小径部３の下端に、径変化部（段差部と同様構造）７を介して、径Ｄ０３の下部小径部６を連設してある。下部小径部６には、上下に等間隔に径Ｄ０４のリング状の節部８、８を形成する。ここで、
Ｄ０３＜Ｄ０２＜Ｄ０３
Ｄ０３＜Ｄ０４
Ｄ０２≒Ｄ０４
Ｄ０４＜Ｄ０１
で形成されている。
また、段差部４は、後に述べる杭穴２０の段差部２３に対応した位置に形成される。 As for the ready-made pile 1 used for implementation of this invention, an upper part is the upper large diameter part 2 of diameter D01, and the small diameter part 3 of diameter D0 continues below the upper large diameter part 2 via the step part 4. (FIG. 1 (a)). The stepped portion 4 is a portion where the diameter gradually changes from the diameter D01 to D02, and θ1 = 45 degrees in front view. Note that θ1 is
θ1 = 0 to 60 °
It can be adjusted at a certain angle.
A lower small diameter portion 6 having a diameter D03 is connected to the lower end of the small diameter portion 3 via a diameter changing portion (similar structure to the stepped portion) 7. In the lower small diameter portion 6, ring-shaped node portions 8 and 8 having a diameter D <b> 04 are formed at equal intervals in the vertical direction. here,
D03 <D02 <D03
D03 <D04
D02 ≒ D04
D04 <D01
It is formed with.
Moreover, the step part 4 is formed in the position corresponding to the step part 23 of the pile hole 20 mentioned later.

２．既製杭１の埋設 2. Burial of ready-made pile 1

（１） 地面（地上）１８から通常の掘削ロッドを使用して（図示していない）、径Ｄ１の杭穴小径部２１（杭穴軸部）を掘削して、根固め部用に径Ｄ３（Ｄ１＜Ｄ３）に拡径して、拡大根固め部２３を形成する。
続いて、径Ｄ１の杭穴小径部２１（軸部）の上部２１ａの杭穴壁を削って、径Ｄ２の上部大径部２４を形成する（図１（ｂ）鎖線図示２１ａ）。ここで、Ｄ１＜Ｄ２、となっている。
径Ｄ２の上部大径部２４は、Ｄ１からＤ２へ徐々に径が変化する正面視θ２の段差部２３を形成し、段差部２３から上方は、地上１８まで径Ｄ２で形成されて、段差部２３は上方に向けてある。
ここで、
Ｄ０２＜Ｄ１、Ｄ１＜Ｄ０１＜Ｄ２
θ２＝０〜６０°
で形成されている。
また、段差部２３を形成する地盤は、いわゆる中間支持層などの地盤強度がある程度大きな深さ位置に形成することが望ましい。中間支持層（地盤強度が大きな地盤）とは、例えば、
砂質でＮ値１５以上
粘土質Ｎ値５以上
の地盤である。
以上のようにして、杭穴２０を形成する（図１（ｂ））。
なお、ここで、Ｄ２の上部大径部２４はＤ１の杭穴小径部２１を掘削後に、杭穴２０の上部の杭穴壁を削って形成したが、地面（地上）１８から径Ｄ２の上部大径部２４を掘削し、段差部２３で徐々に小径として、続いて、同じ掘削ロッドで、Ｄ１の杭穴小径部２１を掘削することもできる。 (1) Using a normal excavation rod (not shown) from the ground (ground) 18 to excavate the small-diameter portion 21 (pile-hole shaft portion) of the diameter D1, and use the diameter D3 for the root consolidation portion The diameter is expanded to (D1 <D3) to form an enlarged root portion 23.
Then, the pile hole wall of the upper part 21a of the pile hole small diameter part 21 (shaft part) of the diameter D1 is shaved, and the upper large diameter part 24 of the diameter D2 is formed (FIG. 1 (b) chain line illustration 21a). Here, D1 <D2.
The upper large-diameter portion 24 having a diameter D2 forms a step portion 23 having a front view θ2 whose diameter gradually changes from D1 to D2, and the upper portion from the step portion 23 is formed with a diameter D2 to the ground 18 to form a step portion. 23 is directed upward.
here,
D02 <D1, D1 <D01 <D2
θ2 = 0 to 60 °
It is formed with.
Further, it is desirable that the ground forming the stepped portion 23 is formed at a depth position where the ground strength such as a so-called intermediate support layer is large to some extent. The intermediate support layer (ground with high ground strength) is, for example,
It is sandy and has an N value of 15 or more.
As described above, the pile hole 20 is formed (FIG. 1B).
Here, the upper large diameter portion 24 of D2 was formed by excavating the pile hole small diameter portion 21 of D1 and then cutting the pile hole wall above the pile hole 20, but the upper portion of the diameter D2 from the ground (ground) 18 was formed. It is also possible to excavate the large-diameter portion 24, gradually reduce the diameter of the step portion 23, and then excavate the small-diameter portion 21 of the D1 pile hole with the same excavation rod.

（２） 所定形状の杭穴２０を形成しながら、または杭穴２０を形成したした後に、杭穴２０内に杭穴充填物（根固め部液、杭周固定液など。ソイルセメント、セメントミルクなど）を充填する。 (2) While forming the pile hole 20 of a predetermined shape, or after forming the pile hole 20, the pile hole filling (root consolidation liquid, pile periphery fixing liquid, etc., soil cement, cement milk) in the pile hole 20 Etc.).

（３） 既製杭１を杭打ち機で把持して、杭穴２０の上端から、既製杭１の下端を従来の任意の方法で、徐々に下降する。 (3) The ready-made pile 1 is grasped with a pile driving machine, and the lower end of the ready-made pile 1 is gradually lowered from the upper end of the pile hole 20 by any conventional method.

（４） 続いて、既製杭１の段差部（すなわち、上部大径部２の下面外周縁）４の外周面を、杭穴２０の段差部２３に乗せて係止する。この状態で、既製杭１は、杭穴２０内の予め定められた位置にあり、この状態を保持できるので、杭穴充填物が固化するまで（通常１〜５時間程度）、放置する。
この状態で、既製杭１は所定の位置を保つので、杭穴２０の段差部２３に係止した後に、杭打ち機から既製杭１を取り外し、その杭打ち機を移動して、他の杭穴へ既製杭を埋設する作業に使用でき、現場内で杭打ち機の効率的な運用ができる。 (4) Subsequently, the outer peripheral surface of the stepped portion 4 of the ready-made pile 1 (that is, the lower outer peripheral edge of the upper large-diameter portion 2) 4 is placed on the stepped portion 23 of the pile hole 20 and locked. In this state, the ready-made pile 1 is in a predetermined position in the pile hole 20 and can hold this state, so it is left until the pile hole filling is solidified (usually about 1 to 5 hours).
In this state, since the ready-made pile 1 maintains a predetermined position, after it is locked to the step portion 23 of the pile hole 20, the ready-made pile 1 is removed from the pile driving machine, and the pile driving machine is moved to another pile. It can be used for burying ready-made piles in the holes, and the pile driver can be used efficiently in the field.

（５） 杭穴充填物が固化したならば、杭穴２０内に既製杭１が埋設された基礎杭構造３０を形成する（図１（ｃ））。 (5) When the pile hole filling is solidified, the foundation pile structure 30 in which the ready-made pile 1 is embedded in the pile hole 20 is formed (FIG. 1C).

３．他の実施形態 3. Other embodiments

（１） 前記実施形態において、１本の既製杭１を埋設する例について説明したが、多数の既製杭１、１を接合して埋設こともできる（図示していない）。この場合には、安定して既製杭を保持するためには、最上に位置する既製杭１に段差部４を形成することが望ましい（図示していない）。しかし、多数の既製杭１、１を接合する場合で、地盤強度などとの関係で、中間に位置する既製杭１に段差部４を形成することもできる。また、最下方に位置する既製杭１に段差部４を形成することもできる。 (1) Although the example which embeds one ready-made pile 1 was demonstrated in the said embodiment, many ready-made piles 1 and 1 can also be joined and embedded (not shown). In this case, in order to stably hold the ready-made pile, it is desirable to form the stepped portion 4 on the ready-made pile 1 positioned at the top (not shown). However, when a large number of ready-made piles 1 and 1 are joined, the stepped portion 4 can be formed in the ready-made pile 1 located in the middle in relation to the ground strength and the like. Moreover, the level | step-difference part 4 can also be formed in the ready-made pile 1 located in the lowest part.

（２） 前記実施形態において、杭穴２０の段差部２３に、硬性材料（鋼などの金属や硬質樹脂、硬質木材など）からなるリング１６を配置することもできる（図１（ｂ）鎖線図示１６）。リング１６の内径は既製杭１の小径部３が挿入できるように、杭穴２０の杭穴小径部の内径Ｄ１に合わせて形成して、これを配置することもできる。また、リング１６に放射方向の切り込みを設ければ（図示していない）、予め既製杭１の小径部３を通して、段差部４に配置して、既製杭１と共に埋設することもできる。
この場合、リング１６に既製杭１の段差部４が載置されるので、既製杭１の沈下をより確実に防止できる。とりわけ、リング１６の外径をＤ２より大きく形成するなどすれば、段差部２３周辺の地盤が比較的弱い場合に有効である。 (2) In the said embodiment, the ring 16 which consists of hard materials (metal, hard resin, hard wood, etc., such as steel) can also be arrange | positioned to the level | step-difference part 23 of the pile hole 20 (FIG.1 (b) chain line illustration. 16). The inner diameter of the ring 16 can be formed according to the inner diameter D1 of the small-diameter portion of the pile hole 20 so that the small-diameter portion 3 of the ready-made pile 1 can be inserted, and this can also be arranged. Further, if a radial cut is provided in the ring 16 (not shown), the ring 16 can be placed in advance in the stepped portion 4 through the small diameter portion 3 of the ready-made pile 1 and embedded with the ready-made pile 1.
In this case, since the stepped portion 4 of the ready-made pile 1 is placed on the ring 16, the ready-made pile 1 can be more reliably prevented from sinking. In particular, if the outer diameter of the ring 16 is formed larger than D2, it is effective when the ground around the step portion 23 is relatively weak.

（３） また、前記実施形態において、杭穴２０を先ず掘削して、その後に既製杭１、１を埋設したが、いわゆる中掘工法で、杭穴２０を掘削しつつ既製杭１、１を埋設することもできる（図示していない）。 (3) Moreover, in the said embodiment, the pile hole 20 was excavated first, and the ready-made piles 1 and 1 were embed | buried after that, but the ready-made piles 1 and 1 were excavated by the so-called digging method while excavating the pile hole 20. It can also be buried (not shown).

（４） また、前記実施形態において、既製杭１の杭穴小径部２１の下端に径変化部７を介して、下小径部６を形成したが、下小径部６を省略して、下端まで径Ｄ０２の構造とすることもできる（図示していない）。また、節８、８を省略することもできる（図示していない）。 (4) Moreover, in the said embodiment, although the lower small diameter part 6 was formed in the lower end of the pile hole small diameter part 21 of the ready-made pile 1 via the diameter change part 7, the lower small diameter part 6 was abbreviate | omitted and it reached to a lower end. A structure having a diameter D02 may be used (not shown). Also, nodes 8 and 8 can be omitted (not shown).

（５） また、前記実施形態において、径変化部７を形成したが、径変化部７を覆うように、節８ａ（＝節８と同一の外形）を形成して、節８ａの上端が径Ｄ０２、下端が径Ｄ０３、に形成した既製杭１とすることもできる（図２（ａ））。この場合も同様に、杭穴２０の段差部２３に既製杭１の段差部４を係止して、杭穴２０内に既製杭１を埋設して（図２（ｂ））、基礎杭構造３０を形成することもできる（図２（ｃ））。 (5) Further, in the embodiment, the diameter changing portion 7 is formed. However, a node 8a (= the same outer shape as the node 8) is formed so as to cover the diameter changing portion 7, and the upper end of the node 8a has a diameter. It can also be set as the ready-made pile 1 which D02 and the lower end formed in the diameter D03 (FIG. 2 (a)). In this case as well, the stepped portion 4 of the ready-made pile 1 is locked to the stepped portion 23 of the pile hole 20, and the ready-made pile 1 is embedded in the pile hole 20 (FIG. 2 (b)), and the foundation pile structure 30 can also be formed (FIG. 2C).

（６） また、前記実施形態において、既製杭１の段差部４に、図２の節部８ａ同様の節部で覆い、節の上端を径Ｄ０１、節の下端をＤ０２とすることもできる（図示していない）。この場合には、段差部４の下面の面積をより大きくできるので、安定して、杭穴２０の段差部２３に保持できる。 (6) Moreover, in the said embodiment, it can also cover the level | step-difference part 4 of the ready-made pile 1 with the node part similar to the node part 8a of FIG. 2, and let the upper end of a node be the diameter D01 and let the lower end of a node be D02. Not shown). In this case, since the area of the lower surface of the stepped portion 4 can be increased, the stepped portion 23 of the pile hole 20 can be stably held.

１ 既製杭
２ 上部大径部
３ 小径部
４ 段差部
６ 下小径部
７ 経変化部（段差）
８、８ａ 節部
１６ リング
１８ 地面（地上）
２０ 杭穴
２１ 杭穴小径部
２２ 拡大根固め部
２３ 段差部
２４ 上部大径部
２６ 中間支持層
３０ 基礎杭構造 DESCRIPTION OF SYMBOLS 1 Ready-made pile 2 Upper large diameter part 3 Small diameter part 4 Step part 6 Lower small diameter part 7 Transformation part (step)
8, 8a Node 16 Ring 18 Ground (ground)
20 Pile hole 21 Pile hole small-diameter portion 22 Expanded consolidation portion 23 Stepped portion 24 Upper large-diameter portion 26 Intermediate support layer 30 Foundation pile structure

Claims (3)

外径Ｄ０１の上部大径部を有し、該大径部の下方を径Ｄ０２（Ｄ０２＜Ｄ０１）の小径部としてなる既製杭を、杭穴内に埋設して、以下のように構成することを特徴とする既製杭の埋設構造。
(1) 前記杭穴は、杭穴小径部が所定径Ｄ１（Ｄ１＜Ｄ０）で形成され、前記杭穴小径部の所定高さから上方に径Ｄ２（Ｄ１＜Ｄ２）の杭穴大径部を形成し、前記杭穴小径部の上端に段差部を形成する。
(2) 前記既製杭の大径部下面外周部を前記杭穴の段差部上面に係止した状態で、前記杭穴内に前記既製杭を埋設する。 A prefabricated pile having an upper large diameter portion having an outer diameter D01 and a lower diameter portion having a diameter D02 (D02 <D01) below the large diameter portion is embedded in a pile hole and configured as follows. The characteristic buried structure of ready-made piles.
(1) The pile hole has a pile hole small diameter portion having a predetermined diameter D1 (D1 <D0), and a pile hole large diameter portion having a diameter D2 (D1 <D2) upward from a predetermined height of the pile hole small diameter portion. And a step portion is formed at the upper end of the small diameter portion of the pile hole.
(2) The ready-made pile is embedded in the pile hole in a state in which the outer peripheral portion of the lower surface of the large-diameter portion of the ready-made pile is locked to the upper surface of the stepped portion of the pile hole. 杭穴の段差部を、地盤強度が大きな深さ位置に設定することを特徴とする請求項１記載の既製杭の埋設構造。 The buried structure of a ready-made pile according to claim 1, wherein the step portion of the pile hole is set at a depth position where the ground strength is large. 杭穴内に、既製杭を以下のように埋設してして基礎杭構造を構築することを特徴とした既製杭の埋設方法。
(1) 前記既製杭を、外径Ｄ０１の上部大径部を有し、該上部大径部の下方を径Ｄ０２（Ｄ０２＜Ｄ０１）の小径部として構成する。
(2) 所定径Ｄ１（Ｄ０２＜Ｄ１＜Ｄ０１）で杭穴小径部を必要深さまで掘削する。
(3) 前記杭穴小径部を所定深さまで掘削した後に、あるいは、前記杭穴小径部の下端部の掘削と同時に、前記杭穴小径部の所定深さから上方に、径Ｄ２（Ｄ０１＜Ｄ２）の上部大径部を掘削し、前記杭穴小径部の上端に段差部を形成する。
(4) 前記杭穴内にセメントミルクなどの固化材料を注入すると前後して、あるいは同時に、前記既製杭を挿入する。
(5) 前記既製杭の大径部下面が前記杭穴の段差部上面に係止した状態を維持して、前記杭穴内に前記既製杭を埋設する。
(6) 前記固化材料が固化したならば、基礎杭構造を構成する。 A method for burying a ready-made pile characterized in that a foundation pile structure is constructed by burying a ready-made pile in a pile hole as follows.
(1) The ready-made pile has an upper large diameter portion having an outer diameter D01, and a lower portion of the upper large diameter portion is configured as a small diameter portion having a diameter D02 (D02 <D01).
(2) Excavate the small diameter part of the pile hole to the required depth with a predetermined diameter D1 (D02 <D1 <D01).
(3) After excavating the small diameter portion of the pile hole to a predetermined depth or simultaneously with excavation of the lower end portion of the small diameter portion of the pile hole, the diameter D2 (D01 <D2) upward from the predetermined depth of the small diameter portion of the pile hole ) Is excavated, and a step portion is formed at the upper end of the small-diameter portion of the pile hole.
(4) Insert the ready-made pile before, after or simultaneously with injection of a solidified material such as cement milk into the pile hole.
(5) The ready-made pile is embedded in the pile hole while maintaining a state where the lower surface of the large-diameter portion of the ready-made pile is locked to the upper surface of the stepped portion of the pile hole.
(6) If the solidified material is solidified, a foundation pile structure is constructed.
JP2014064845A 2014-03-26 2014-03-26 Pre-built pile burying structure, pre-made pile laying method Active JP6400315B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2014064845A JP6400315B2 (en) 2014-03-26 2014-03-26 Pre-built pile burying structure, pre-made pile laying method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2014064845A JP6400315B2 (en) 2014-03-26 2014-03-26 Pre-built pile burying structure, pre-made pile laying method

Publications (2)

Publication Number Publication Date
JP2015187344A true JP2015187344A (en) 2015-10-29
JP6400315B2 JP6400315B2 (en) 2018-10-03

Family

ID=54429692

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2014064845A Active JP6400315B2 (en) 2014-03-26 2014-03-26 Pre-built pile burying structure, pre-made pile laying method

Country Status (1)

Country Link
JP (1) JP6400315B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017096038A (en) * 2015-11-27 2017-06-01 ジャパンパイル株式会社 Method for constructing pile foundation and pile foundation
CN110130337A (en) * 2019-04-18 2019-08-16 太原理工大学 A kind of pile sinking process reducing penetrating resistance

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB419139A (en) * 1933-04-03 1934-11-05 Ver Stahlwerke Ag Improvements in piles and sheet piling walls
JPS62253817A (en) * 1986-04-28 1987-11-05 Nippon Concrete Ind Co Ltd Burying work of custom-made concrete pile with expanded head
JPH03275806A (en) * 1990-03-26 1991-12-06 Furansu Baninpe Uiramu Method of making knotting pile
JPH05331848A (en) * 1992-05-28 1993-12-14 Maeda Corp Construction method of pile strengthened in its horizontal resistance
JPH09195270A (en) * 1996-01-18 1997-07-29 Mitani Sekisan Co Ltd Method of constructing foundation pile, and foundation pile
JPH11181759A (en) * 1997-12-19 1999-07-06 Oak:Kk Steel pipe pile
JP2001336149A (en) * 2000-05-26 2001-12-07 Safety Service System:Kk Taper pile for civil engineering and building work foundation construction, foundation construction equipment therefor, and embedding method therefor
JP2007315027A (en) * 2006-05-25 2007-12-06 Mitani Sekisan Co Ltd Construction method for foundation pile, structure of foundation pile, and designing method for foundation pile
JP2008045327A (en) * 2006-08-15 2008-02-28 Japan Pile Corp Construction method for head-enlarged pile
JP2008248493A (en) * 2007-03-29 2008-10-16 Mitani Sekisan Co Ltd Pile holder installed on existing pile and method for connecting and burying existing pile

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB419139A (en) * 1933-04-03 1934-11-05 Ver Stahlwerke Ag Improvements in piles and sheet piling walls
JPS62253817A (en) * 1986-04-28 1987-11-05 Nippon Concrete Ind Co Ltd Burying work of custom-made concrete pile with expanded head
JPH03275806A (en) * 1990-03-26 1991-12-06 Furansu Baninpe Uiramu Method of making knotting pile
JPH05331848A (en) * 1992-05-28 1993-12-14 Maeda Corp Construction method of pile strengthened in its horizontal resistance
JPH09195270A (en) * 1996-01-18 1997-07-29 Mitani Sekisan Co Ltd Method of constructing foundation pile, and foundation pile
JPH11181759A (en) * 1997-12-19 1999-07-06 Oak:Kk Steel pipe pile
JP2001336149A (en) * 2000-05-26 2001-12-07 Safety Service System:Kk Taper pile for civil engineering and building work foundation construction, foundation construction equipment therefor, and embedding method therefor
JP2007315027A (en) * 2006-05-25 2007-12-06 Mitani Sekisan Co Ltd Construction method for foundation pile, structure of foundation pile, and designing method for foundation pile
JP2008045327A (en) * 2006-08-15 2008-02-28 Japan Pile Corp Construction method for head-enlarged pile
JP2008248493A (en) * 2007-03-29 2008-10-16 Mitani Sekisan Co Ltd Pile holder installed on existing pile and method for connecting and burying existing pile

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017096038A (en) * 2015-11-27 2017-06-01 ジャパンパイル株式会社 Method for constructing pile foundation and pile foundation
CN110130337A (en) * 2019-04-18 2019-08-16 太原理工大学 A kind of pile sinking process reducing penetrating resistance
CN110130337B (en) * 2019-04-18 2020-12-18 太原理工大学 Pile sinking method capable of reducing pile sinking resistance

Also Published As

Publication number Publication date
JP6400315B2 (en) 2018-10-03

Similar Documents

Publication Publication Date Title
JP5199166B2 (en) Foundation pile structure by site construction and construction method of foundation pile
JP5762511B2 (en) Ground improvement wall construction method
JP2006226064A (en) Pile construction method and pile structure
JP2015218516A (en) Construction method of foundation pile whose pile head is reinforced, foundation pile structure whose pile head is reinforced
JP6400315B2 (en) Pre-built pile burying structure, pre-made pile laying method
JP5391390B1 (en) Foundation steel pipes, rotary tools used for foundation steel pipes, and methods for their construction
JP5280257B2 (en) Foundation pile structure and construction method of foundation pile
KR20150025409A (en) the tunnel structure using the small diameter steel pipe and the construction method thereof
JP2017128877A (en) Construction method of precast pile
JP2009030372A (en) Construction method for double pipe type pile head structure
JP2013040447A (en) Combined footing pile and structuring method for combined footing pile
JP5850629B2 (en) How to embed pipes in pile holes
JP5665980B2 (en) Pile construction method using buried jig and buried jig for pile construction
JP2007247339A (en) Newly constructed foundation structure
JP6758629B2 (en) Existing pile gripping device
JP6757003B2 (en) Construction method of double pipe pile and double pipe pile
KR20190027402A (en) Low part cast in place pile construction method
JP5187968B2 (en) Ready-made pile burial equipment and burial method
JP4911242B2 (en) Reinforcement structure of existing gravity quay
JP6735138B2 (en) Construction method of retaining wall structure and retaining wall structure
JP6462298B2 (en) Foundation pile structure
JP2015063878A (en) Method of constructing steel pipe pile and steel pipe pile
JP2019094742A (en) Pile removal method
JP5071320B2 (en) How to pull out a pile
JP2018109308A (en) Foundation structure, method for constructing foundation structure, and consolidation support member

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20170221

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20171208

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20171219

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20180216

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20180731

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20180905

R150 Certificate of patent or registration of utility model

Ref document number: 6400315

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250