JP2008045327A - Construction method for head-enlarged pile - Google Patents

Construction method for head-enlarged pile Download PDF

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JP2008045327A
JP2008045327A JP2006221587A JP2006221587A JP2008045327A JP 2008045327 A JP2008045327 A JP 2008045327A JP 2006221587 A JP2006221587 A JP 2006221587A JP 2006221587 A JP2006221587 A JP 2006221587A JP 2008045327 A JP2008045327 A JP 2008045327A
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pile
construction
hole
head
casing
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JP4928192B2 (en
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Hiroaki Shimizu
裕明 清水
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Japan Pile Corp
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Japan Pile Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for a head-enlarged pile, which enables efficient and safe construction while preventing the mixing of excavated soil, causing a decrease in the end bearing capacity of the pile, by utilizing a preboring method. <P>SOLUTION: A casing 2, the spiral blade 2a of which is provided on its outer periphery, and a drill rod 3, which passes through the casing 2, are inserted into ground while being rotated, so that a hole 4 for pile construction can be bored. An upper portion of the hole 4 is cut by pulling out the casing 2 while rotating it, so that a diameter-enlarged portion 4a can be formed in the upper portion of the hole 4. Next, a prefabricated pile is erected in the hole 4 by using the casing 2 as a guide, so that a main body portion 1b of the head-enlarged pile 1 can be formed. Subsequently, the casing 2 is removed, and a head-enlarged portion 1a of the head-enlarged pile 1 is formed in the diameter-enlarged portion 4a after that. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、プレボーリング工法による既製杭からなる拡頭杭の施工方法に関するものである。   The present invention relates to a method for constructing a head-expansion pile made of a ready-made pile by a pre-boring method.

杭頭部に作用する過大なせん断力と曲げモーメントに備えて杭頭部に杭の本体部分より径の大きい拡頭部を有する拡頭杭が知られている。この種の拡頭杭は主にRC杭やPC杭、SC杭などの既製杭、鋼管杭などから形成され、またプレボーリング工法によって施工されることが多い。   In order to prepare for an excessive shearing force and bending moment acting on the pile head, a head-expanded pile having an enlarged head with a larger diameter than the main body of the pile is known. This type of expanded pile is mainly formed from pre-made piles such as RC piles, PC piles and SC piles, steel pipe piles, etc., and is often constructed by a pre-boring method.

プレボーリング工法は、あらかじめアースオーガー等を用いて地中に杭施工用孔をあけ、この杭施工用孔内に既製杭を立て込んで杭を施工する方法で、騒音の心配がないため広く採用されている。   The pre-boring method is a method that uses a ground auger or the like to open a hole for pile construction in the ground in advance, and lays a ready-made pile in this hole for pile construction to construct a pile. ing.

従来、既製杭からなる拡頭杭をプレボーリング工法で施工する場合、アースオーガー等を用いて杭を施工するための杭施工用孔を削孔する前か後に、当該杭施工用孔の上部に杭施工用孔より大きい内径の拡径部を形成し、次にこの杭施工用孔に既製杭を立て込んで杭の本体部分を形成し、続いて拡径部に拡頭部を形成する。   Conventionally, when a pre-boring method is used to construct a head-expanded pile made of ready-made piles, the pile is placed on the top of the pile construction hole before or after drilling the pile construction hole for constructing the pile using an earth auger or the like. An enlarged diameter portion having an inner diameter larger than that of the construction hole is formed, and then a pre-made pile is put into the pile construction hole to form a main body portion of the pile, and subsequently, an enlarged head portion is formed in the enlarged diameter portion.

またその際、杭の支持力は一般に、杭の先端支持力と杭の周面摩擦力の合計によって評価され、ほとんどが杭の先端支持力に依存する杭として施工されるため、施工時の杭の先端処理が重要になる。   In this case, the pile support force is generally evaluated by the sum of the pile tip support force and the peripheral surface friction force of the pile, and most of the piles are constructed as piles that depend on the pile tip support force. The tip processing is important.

特開昭62−253817号公報JP 62-253817 A 特開2006−132100号公報JP 2006-132100 A 特開2006−118215号公報JP 2006-118215 A

しかし、杭施工用孔を削孔する前に当該杭施工用孔の上部に大きな孔を掘って拡径部を形成する方法は、拡径部がその後の作業を行う上で障害となることがあり、安全性に問題があった。   However, the method of forming a large-diameter portion by drilling a large hole in the upper part of the pile-construction hole before drilling the pile-construction hole can be an obstacle to the subsequent work. There was a safety problem.

一方、杭施工用孔を削孔した後に当該杭施工用孔の上部に孔壁を切削して拡径部を形成する方法は、掘削土が杭施工用孔に落ち、これが杭の支持力を低下させる恐れがある。   On the other hand, after drilling a hole for pile construction, the method of cutting the hole wall at the top of the hole for pile construction to form an enlarged diameter part is that the excavated soil falls into the hole for pile construction, and this increases the bearing capacity of the pile. There is a risk of lowering.

また、杭施工用孔と同様に拡径部もアースオーガーで削孔しようとすると、径の大きい掘削ロッドを使用する必要があるため、段取りによっては別に孔を削孔することになるため、非効率な施工を強いられる恐れがあった。   Also, as with the hole for pile construction, if you try to drill the enlarged diameter part with an earth auger, it is necessary to use a drilling rod with a large diameter. There was a risk of being forced to work efficiently.

さらに、いずれの方法も、杭施工用孔の上部に拡径部を有することにより、杭施工用孔に既製杭を立て込む際にふらついて杭の立て込み精度が落ちる等の課題があった。   Furthermore, each method has a problem that, by having an enlarged diameter portion at the upper part of the hole for pile construction, when the ready-made pile is stood in the hole for pile construction, the pile setting accuracy is lowered.

本発明は、以上の課題を解決するためになされたもので、プレボーリング工法を利用し、杭の支持力の低下を招く掘削土の混入を防ぎながら効率的かつ安全に施工できる拡頭杭の施工方法を提供することを目的とするものである。   The present invention was made in order to solve the above-mentioned problems. The construction of a head-expanded pile that can be constructed efficiently and safely while using a pre-boring method and preventing mixing of excavated soil leading to a decrease in the bearing capacity of the pile. It is intended to provide a method.

請求項1記載の発明は、プレボーリング工法による拡頭杭の施工方法であって、外周上部に掘削手段を有するケーシングと当該ケーシングを貫通する掘削ロッドを回転させながら地中に挿入して杭施工用孔を削孔する工程と、前記ケーシングの掘削手段により前記杭施工用孔の上部を切削することにより前記杭施工用孔の上部に拡径部を形成する工程と、前記ケーシングをガイドにして前記杭施工用孔に既製杭を立て込んで前記拡頭杭の本体部分を形成する工程と、前記ケーシングを撤去する工程と、前記拡径部に前記拡頭杭の拡頭部分を形成する工程とを有することを特徴とするものである。   The invention according to claim 1 is a method for constructing a head-expanded pile by a pre-boring method, wherein the casing having excavation means on the outer peripheral upper part and the excavating rod penetrating the casing are inserted into the ground while being rotated. A step of drilling a hole, a step of forming an enlarged portion in the upper portion of the hole for pile construction by cutting an upper portion of the hole for pile construction by means of excavating means of the casing, and the casing as a guide Having a step of forming a main body part of the head-expanded pile by standing a ready-made pile in a hole for pile construction, a step of removing the casing, and a step of forming a head-expanded portion of the head-expanded pile in the diameter-expanded portion. It is a feature.

本発明は、既成杭からなる拡頭杭をプレボーリング工法によって施工する際、特に孔壁を保護するケーシングの外周の上部に掘削手段を設け、杭施工用孔を削孔した後、当該ケーシングを掘削方向に回転させなから引き抜くことにより杭施工用孔の上部に拡径部を容易に形成できるようにしたものである。   The present invention provides a drilling means at the upper part of the outer periphery of the casing that protects the hole wall, and excavates the casing after drilling the hole for pile construction when constructing the expanded pile made of precast pile by the pre-boring method. The diameter-expanded portion can be easily formed in the upper part of the hole for pile construction by pulling out without rotating in the direction.

また、拡径部の施工中および杭施工用孔に既製杭を立て込む際、杭施工用孔の上部をケーシングによって保護し、掘削土が杭施工用孔に落ちないようにすることで、掘削土の落下が原因とされる杭の支持力の低下を防止するようにしたものである。   In addition, when constructing ready-made piles during construction of expanded diameter parts and pile construction holes, the upper part of the pile construction holes is protected by a casing so that excavated soil does not fall into the pile construction holes. It is intended to prevent a decrease in the bearing capacity of the pile caused by the fall of soil.

さらに、杭施工用孔の上端部にケーシングを鉛直に立て付け、当該ケーシングを杭施工用孔に既製杭を立て込む際のガイド部材として利用することにより既製杭の鉛直性を保持して施工性と施工精度を高めるようにしたものである。   Furthermore, the verticality of the ready-made pile is maintained by standing the casing vertically on the upper end of the hole for pile construction and using the casing as a guide member when standing the ready-made pile in the hole for pile construction. And the construction accuracy is improved.

なお、杭施工用孔の削孔には、掘削時の孔壁を保護するため泥水工法を併用することが望ましい。また、拡頭部は場所打ちコンクリートまたは既製杭のいずれでも形成することができる。さらに、杭本体部分の先端に拡径部を設けて杭の先端支持力を高めることもできる。   In addition, it is desirable to use a muddy water method in combination with the drilling holes for pile construction in order to protect the hole wall during excavation. Further, the head extension can be formed by either cast-in-place concrete or ready-made piles. Furthermore, an enlarged diameter part can be provided in the front-end | tip of a pile main-body part, and the front-end | tip supporting force of a pile can also be improved.

請求項2記載の拡頭杭の施工方法は、請求項1記載の拡頭杭の施工方法において、掘削手段はらせん翼であることを特徴とするものである。杭施工用孔の上部を切削して拡径部を形成するための掘削手段は、特に限定されるものではないが、特にらせん翼は杭施工用の孔壁を効率的に切削して拡径することができる。   The method for constructing the expanded pile according to claim 2 is the method for constructing the expanded pile according to claim 1, wherein the excavating means is a spiral blade. The excavation means for cutting the upper part of the hole for pile construction to form the enlarged diameter part is not particularly limited. In particular, the spiral blade efficiently cuts the hole wall for pile construction and expands the diameter. can do.

請求項3記載の拡頭杭の施工方法は、請求項1または2記載の拡頭杭の施工方法において、拡頭部分は既製杭によって形成することを特徴とするものである。拡頭部分は場所打ちコンクリートまたは既製杭のいずれでも形成することができるが、特に既製杭による施工は現場施工の省力化が図れる。   The construction method of the head-expansion pile according to claim 3 is the construction method of the head-expansion pile according to claim 1 or 2, wherein the head extension portion is formed by a ready-made pile. The head-expanded part can be formed by either cast-in-place concrete or ready-made piles, but construction with ready-made piles can save labor in field construction.

本発明は、杭施工用孔の上部を切削して拡径部を形成する際および杭施工用孔に既製杭を立て込む際、杭施工用孔の上端部にケーシングを設置して掘削土が杭施工用孔に落ちないようにすることで、掘削孔に掘削土が落ちこれがもとで杭の先端支持力が低下するようなことはない。   When cutting the upper part of a hole for pile construction to form an enlarged diameter part and when putting a ready-made pile into the hole for pile construction, the present invention installs a casing on the upper end part of the hole for pile construction, By making it not fall into the hole for pile construction, the excavated soil falls into the borehole, and this does not cause the tip support force of the pile to decrease.

また、杭施工用孔に既製杭を立て込む際、杭施工用孔の上端部にケーシングを設置し、このケーシングを杭施工用孔に既製杭を鉛直に立て込むためのガイド部材として利用することにより、既製杭のふらつき等を防止して既製杭の鉛直性が保てるため、既製杭を杭施工用孔に効率的にかつ精度良く立て込むことができる。   In addition, when a ready-made pile is stood in the pile construction hole, a casing is installed at the upper end of the pile construction hole, and this casing is used as a guide member for vertically placing the ready-made pile in the pile construction hole. Therefore, since the verticality of the ready-made piles can be maintained by preventing the ready-made piles from wobbling, the ready-made piles can be put into the hole for pile construction efficiently and accurately.

図1は拡頭杭の一例を示し、拡頭杭の本体部分1bと当該本体部分1bより大きい径の拡頭部分1aの全長がRC杭やPC杭、SC杭などの既製杭、鋼管杭などから一体に形成されている。   FIG. 1 shows an example of a head-expanded pile, and the total length of the main-body portion 1b of the head-expanded pile and the head-expanded portion 1a having a diameter larger than that of the main-body portion 1b is integrated with a ready-made pile such as RC pile, PC pile, SC pile, and steel pipe pile. Is formed.

杭の本体部分1bは、一定長さに形成された既製杭を必要数継ぎ足し、互いに接合することにより一体に形成され、当該本体部分1bの上端部に拡頭部分1aが一体に形成されている。   The main body portion 1b of the pile is integrally formed by adding a necessary number of ready-made piles formed to have a certain length and joined to each other, and the enlarged head portion 1a is integrally formed at the upper end portion of the main body portion 1b.

図2(a)〜(g)は、プレボーリング工法による拡頭杭の施工方法を示し、以下施工手順について説明する。   Fig.2 (a)-(g) shows the construction method of the expansion pile by the pre-boring method, and demonstrates a construction procedure below.

最初に、ケーシング2と当該ケーシング2を貫通する掘削ロッド3を回転させながら地中に鉛直に押し込んで杭施工用孔4を削孔する。ここで用いられるケーシング2は鋼管から形成され、外周に鋼管の上端部から中間部にわたって連続するらせん翼2aを備えている。掘削ロッド3は杭施工用孔4の深さに応じてロッドを順次継ぎ足して延長できるように構成されている。また、杭施工用孔4の削孔には泥水工法を併用して孔壁を保護する。   First, while rotating the casing 2 and the excavating rod 3 penetrating the casing 2, the pile construction hole 4 is drilled by being pushed vertically into the ground. The casing 2 used here is formed of a steel pipe, and has a spiral blade 2a that is continuous from the upper end to the middle of the steel pipe on the outer periphery. The excavation rod 3 is configured such that the rods can be successively extended and extended in accordance with the depth of the pile construction hole 4. In addition, a muddy water method is also used for drilling the pile construction hole 4 to protect the hole wall.

こうして、所定の深さまで杭施工用孔4を削孔したら、地中にケーシング2を残し、掘削ロッド3を回転させながら引き上げて撤去する。また、杭施工用孔4内に杭周固定液(図省略)を注入する。なお、杭周固定液は杭施工用孔4内に形成された拡頭杭1の本体部分1bを一体的に固定するための固化液である。   In this way, if the pile construction hole 4 is drilled to a predetermined depth, the casing 2 is left in the ground, and the excavating rod 3 is pulled up and removed while rotating. Moreover, a pile circumference fixing liquid (not shown) is injected into the pile construction hole 4. In addition, a pile periphery fixing liquid is a solidification liquid for fixing the main-body part 1b of the head-expansion pile 1 formed in the hole 4 for pile construction integrally.

次に、ケーシング2を回転させながら引き抜いて、杭施工用孔4の上部に杭施工用孔4の径より大きい径の拡径部4aを形成する。   Next, the casing 2 is pulled out while rotating, and an enlarged diameter portion 4 a having a diameter larger than the diameter of the pile construction hole 4 is formed in the upper part of the pile construction hole 4.

この場合、ケーシング2を推進方向に回転させながら引き抜くことにより、杭施工用孔4の上部の孔壁がケーシング2のらせん翼2aによって切削され、掘削土がらせん翼2aによって地上に排出されることで、杭施工用孔4の上部に拡径部4aが形成される。   In this case, by pulling out the casing 2 while rotating in the propulsion direction, the hole wall at the top of the hole 4 for pile construction is cut by the spiral blade 2a of the casing 2, and the excavated soil is discharged to the ground by the spiral blade 2a. Thus, the enlarged diameter portion 4a is formed in the upper part of the hole 4 for pile construction.

ケーシング2は、らせん翼2aを有するケーシング2の中間部より上の部分のみを地中から引き抜き、中間部より下の部分を杭施工用孔4の上端部に挿入した状態で地上に鉛直に立て付ける。こうすることで、掘削土が杭施工用孔4内に落ち込むのを防止することができる。   The casing 2 stands vertically on the ground in a state in which only a portion above the middle portion of the casing 2 having the spiral blade 2a is pulled out from the ground and a portion below the middle portion is inserted into the upper end portion of the hole 4 for pile construction. wear. By carrying out like this, it can prevent that excavated soil falls in the hole 4 for pile construction.

次に、杭施工用孔4内に杭の本体部分1bとなる既製杭を立て込む。この場合、既製杭はケーシング2に通して杭施工用孔4内に立て込むことにより既製杭の鉛直性を保持する。また、杭の本体部分1bの長さに応じて一定長さに形成された既製杭を順次継ぎ足し、互いに接続しながら杭施工用孔4内に立て込んで本体部分1bの全長を形成する。そして、本体部分1bの施工が完了したらケーシング2を撤去する。   Next, the ready-made pile used as the main-body part 1b of a pile is stood up in the hole 4 for pile construction. In this case, the ready-made pile passes through the casing 2 and stands in the pile construction hole 4 to maintain the verticality of the ready-made pile. Moreover, the ready-made pile formed in fixed length according to the length of the main-body part 1b of a pile is added one by one, and it stands in in the hole 4 for pile construction, connecting with each other, and forms the full length of the main-body part 1b. And if construction of the main-body part 1b is completed, the casing 2 will be removed.

次に、拡径部4a内に拡頭部分1aとなる既製杭を立て込み、本体部分1bと一体的に接合することにより拡頭杭1の全長を形成する。   Next, the ready-made pile used as the head-expansion part 1a is stood up in the diameter expansion part 4a, and the full length of the head-expansion pile 1 is formed by joining integrally with the main-body part 1b.

本発明は、プレボーリング工法を利用し、杭の先端支持力の低下を招く掘削土の混入を防ぎながら効率的かつ安全に拡頭杭を施工することができる。   The present invention makes it possible to construct a head-expanded pile efficiently and safely using a pre-boring method and preventing mixing of excavated soil that causes a decrease in the tip support force of the pile.

拡頭杭の一例を示す正面図である。It is a front view which shows an example of an expansion head pile. (a)〜(g)はプレボーリング工法による拡頭杭の施工手順を示す工程図である。(A)-(g) is process drawing which shows the construction procedure of the expansion pile by the pre-boring method. (a)は本工法で用いられるケーシングの正面図、(b)はケーシングの使用状態を示す縦断面図である。(A) is a front view of the casing used by this construction method, (b) is a longitudinal cross-sectional view which shows the use condition of a casing.

符号の説明Explanation of symbols

1 拡頭杭
1a 拡頭杭の拡頭部分
1b 拡頭杭の本体部分
2 ケーシング
2a らせん翼(掘削手段)
3 掘削ロッド
4 杭施工用孔
4a 拡径部
DESCRIPTION OF SYMBOLS 1 Head-expanded pile 1a Head-expanded part 1b of head-expanded pile Main part of head-expanded pile 2 Casing 2a Spiral wing (excavation means)
3 Drilling rod 4 Pile construction hole 4a Expanded part

Claims (3)

プレボーリング工法による拡頭杭の施工方法であって、外周上部に掘削手段を有するケーシングと当該ケーシングを貫通する掘削ロッドを回転させながら地中に挿入して杭施工用孔を削孔する工程と、前記ケーシングの掘削手段により前記杭施工用孔の上部を切削することにより前記杭施工用孔の上部に拡径部を形成する工程と、前記ケーシングをガイドにして前記杭施工用孔に既製杭を立て込んで前記拡頭杭の本体部分を形成する工程と、前記ケーシングを撤去する工程と、前記拡径部に前記拡頭杭の拡頭部分を形成する工程とを有することを特徴とする拡頭杭の施工方法。   It is a construction method of a head-expanded pile by a pre-boring method, and a step of drilling a hole for pile construction by inserting it into the ground while rotating a casing having a drilling means on the outer periphery and a drilling rod passing through the casing, Cutting the upper part of the hole for pile construction by means of excavating means of the casing, and forming an enlarged diameter part on the upper part of the hole for pile construction; A method for constructing a head-expansion pile, comprising: a step of forming a main body portion of the head-expansion pile by standing; a step of removing the casing; and a step of forming a head-expansion portion of the head-expansion pile in the diameter-expanded portion. . 掘削手段はらせん翼であることを特徴とする請求項1記載の拡頭杭の施工方法。   2. The method for constructing a head pile according to claim 1, wherein the excavating means is a spiral wing. 拡頭部分は既製杭で形成することを特徴とする請求項1または2記載の拡頭杭の施工方法。
The method for constructing a head-expansion pile according to claim 1 or 2, wherein the head-expansion portion is formed by a ready-made pile.
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JP2015187344A (en) * 2014-03-26 2015-10-29 三谷セキサン株式会社 Buried structure of prefabricated pile and burying method of prefabricated pile
JP2018003433A (en) * 2016-07-01 2018-01-11 西松建設株式会社 Construction method of double pipe pile and double pipe pile
KR101841250B1 (en) * 2017-02-02 2018-03-22 이엑스티 주식회사 Construction method of non-displacement pile by gelled soil

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CN106087999B (en) * 2016-03-19 2019-05-24 王继忠 It is a kind of to stir the constructing device and its construction method for spraying expanding reinforcing pile

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JP2015187344A (en) * 2014-03-26 2015-10-29 三谷セキサン株式会社 Buried structure of prefabricated pile and burying method of prefabricated pile
JP2018003433A (en) * 2016-07-01 2018-01-11 西松建設株式会社 Construction method of double pipe pile and double pipe pile
KR101841250B1 (en) * 2017-02-02 2018-03-22 이엑스티 주식회사 Construction method of non-displacement pile by gelled soil

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