JP2018096037A - Method of forming irregularity on ground improvement body - Google Patents

Method of forming irregularity on ground improvement body Download PDF

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JP2018096037A
JP2018096037A JP2016238468A JP2016238468A JP2018096037A JP 2018096037 A JP2018096037 A JP 2018096037A JP 2016238468 A JP2016238468 A JP 2016238468A JP 2016238468 A JP2016238468 A JP 2016238468A JP 2018096037 A JP2018096037 A JP 2018096037A
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ground improvement
improvement body
ground
forming
recess
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JP6866140B2 (en
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裕久 中野
Hirohisa Nakano
裕久 中野
壽 中村
Hisashi Nakamura
壽 中村
剛 本多
Takeshi Honda
剛 本多
建次 梅村
Kenji Umemura
建次 梅村
高義 石田
Takayoshi Ishida
高義 石田
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Takenaka Komuten Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a method for forming irregularity on a ground improvement body which forms proper irregularity on the ground improvement body as well as improving workability.SOLUTION: A method for forming irregularity on a ground improvement body 2 to form the irregularity for horizontal force transmission on a top level 2a of the ground improvement body 2 comprises: rotatably and drivably attaching a cutter 8 with a rotating blade 7 to a heavy machine 9; and forming the irregularity by cutting the top level 2a of the ground improvement body 2 with the cutter 8.SELECTED DRAWING: Figure 3

Description

本発明は、地盤改良体の天端に凹凸部を成型する地盤改良体に対する凹凸部の成型方法に関する。   The present invention relates to a method for forming an uneven portion for a ground improvement body that forms an uneven portion at the top end of the ground improvement body.

例えば、軟弱地盤等では、地震時等に地盤が液状化する可能性があることから、液状化を防止するために、地盤改良した地盤改良体を造成し、その地盤改良体の上に構造物を構築している（例えば、特許文献１、２参照。）。   For example, in soft ground, the ground may be liquefied during an earthquake, etc., so in order to prevent liquefaction, a ground improvement body with improved ground is created, and a structure is placed on the ground improvement body. (See, for example, Patent Documents 1 and 2).

特許文献１、２に記載のものでは、地盤改良体の天端に凹部を施工することで凹凸部を成型し、その地盤改良体の上に構造物のコンクリート基礎を構築して、地盤改良体の凸部をコンクリート基礎に呑み込ませている。これにより、地震時や強風時等に構造物に水平力が生じても、凹凸部によってその水平力を地盤改良体に伝達することができ、構造物に生じる水平力に対して、地盤改良体と構造物との間での摩擦抵抗力を高めている。   In the ones described in Patent Documents 1 and 2, a concave and convex portion is formed by constructing a concave portion at the top end of the ground improvement body, and a concrete foundation of a structure is constructed on the ground improvement body. The convex part of is rubbed into the concrete foundation. As a result, even if a horizontal force is generated in the structure during an earthquake or strong wind, the horizontal force can be transmitted to the ground improvement body by the uneven portion, and the ground improvement body can be transmitted against the horizontal force generated in the structure. And the frictional resistance between the structure and the structure is increased.

特開２０１２−１０７４４６号公報JP 2012-107446 A 特開２０１５−４２８２０号公報JP2015-42820A

凹凸部は、構造物に生じる水平力を地盤改良体に伝達することから、凹部を施工する際にその凹部の形状を適切な形状に施工することが望まれている。また、凹部の数が多数となる場合もあり、簡易に且つ短時間で凹部を施工することが望まれている。   Since the concavo-convex part transmits a horizontal force generated in the structure to the ground improvement body, it is desired that the concave part is constructed in an appropriate shape when the concave part is constructed. Moreover, there may be a large number of recesses, and it is desired to construct the recesses easily and in a short time.

しかしながら、特許文献１に記載のものでは、コアカッターを用いて地盤改良体の天端を切削して凹部を施工するので、凹部の形状を適切な形状に施工し難く、その施工に時間がかかることから、施工性の向上が望まれている。   However, in the thing of patent document 1, since the top edge of a ground improvement body is cut using a core cutter and a recessed part is constructed, it is difficult to construct the shape of the recessed part into an appropriate shape, and the construction takes time. Therefore, improvement of workability is desired.

また、特許文献２に記載のものでは、どのような作業機を用いて地盤改良体の天端を切削して凹部を施工するかが記載されておらず、凹凸部をどのようにして成型するかが具体的に記載されていない。   Moreover, in the thing of patent document 2, it does not describe what working machine is used to cut the top end of the ground improvement body to construct the concave portion, and how to form the concave and convex portion. Is not specifically described.

この実情に鑑み、本発明の主たる課題は、施工性の向上を図りながら、地盤改良体に対して適切な凹凸部を成型できる地盤改良体に対する凹凸部の成型方法を提供する点にある。   In view of this situation, a main problem of the present invention is to provide a method for forming a concavo-convex portion for a ground improvement body capable of forming an appropriate concavo-convex portion for the ground improvement body while improving workability.

本発明の第１特徴構成は、地盤改良体の天端に水平力伝達用の凹凸部を成型する地盤改良体に対する凹凸部の成型方法であって、
回転刃を有する切削機を回転駆動自在に重機に取り付け、その切削機にて地盤改良体の天端を切削して前記凹凸部を成型する点にある。 The first characteristic configuration of the present invention is a method for forming an uneven portion with respect to a ground improvement body for forming an uneven portion for horizontal force transmission at the top end of the ground improvement body,
A cutting machine having a rotary blade is attached to a heavy machine so as to be freely rotatable, and the top end of the ground improvement body is cut by the cutting machine to form the uneven portion.

本構成によれば、重機に取り付けた切削機の回転刃を回転駆動させることで、地盤改良体の天端を適切に切削することができるので、凹部の形状を適切な形状に施工し易くなるとともに、その凹部の施工を短時間で行うことができる。これにより、施工性の向上を図りながら、地盤改良体に対して適切な凹凸部を成型することができる。   According to this configuration, the top edge of the ground improvement body can be appropriately cut by rotationally driving the rotary blade of the cutting machine attached to the heavy machinery, so that the concave portion can be easily formed into an appropriate shape. At the same time, the recess can be constructed in a short time. Thereby, a suitable uneven | corrugated | grooved part can be shape | molded with respect to a ground improvement body, aiming at the improvement of workability.

本発明の第２特徴構成は、前記凹凸部における凹部の断面形状を半円形状とする点にある。   A second characteristic configuration of the present invention is that the cross-sectional shape of the concave portion in the concave and convex portion is a semicircular shape.

本構成によれば、凹部の断面形状が半円形状であるので、構造物に生じる水平力を凹凸部によって地盤改良体に伝達する際に、応力集中が発生し難く、凹凸部の断面形状が欠損し難くなる。これにより、地震時や強風時等に構造物に水平力が生じても、欠損し難い凹凸部によって、その水平力を適切に地盤改良体に伝達することができ、構造物に生じる水平力に対して、地盤改良体と構造物との間での摩擦抵抗力の向上を適切に図ることができる。   According to this configuration, since the cross-sectional shape of the concave portion is a semicircular shape, it is difficult for stress concentration to occur when the horizontal force generated in the structure is transmitted to the ground improvement body by the concave and convex portion, and the cross-sectional shape of the concave and convex portion is It becomes difficult to lose. As a result, even if a horizontal force is generated in the structure during an earthquake or a strong wind, the horizontal force can be appropriately transmitted to the ground improvement body by the uneven portion that is difficult to be lost, and the horizontal force generated in the structure is reduced. On the other hand, it is possible to appropriately improve the frictional resistance between the ground improvement body and the structure.

本発明の第３特徴構成は、前記凹凸部の成型時期は、前記地盤改良体の養生前、及び、前記地盤改良体の養生後に設定可能とする点にある。   The 3rd characteristic structure of this invention exists in the point which can set the shaping | molding time of the said uneven | corrugated | grooved part before the curing of the said ground improvement body, and after the curing of the said ground improvement body.

本構成によれば、地盤改良体を造成した後、地盤改良体の養生前に限らず、地盤改良体の養生後にも、凹凸部を成型することができる。例えば、地盤改良体を造成した後、直ぐに凹凸部を成型できる場合には、地盤改良体の養生前に凹凸部を成型することができながら、施工状況等に応じて、凹凸部を成型する時期を地盤改良体の養生前から養生後に変更設定することもできる。これにより、施工状況等に応じて、凹部の施工順序を柔軟に変更することができるので、施工性の向上を図り、工期の短縮化を図ることができる。   According to this structure, after forming a ground improvement body, an uneven | corrugated | grooved part can be shape | molded not only before curing of a ground improvement body but after curing of a ground improvement body. For example, if the uneven part can be molded immediately after the ground improvement body is created, the uneven part can be formed before curing the ground improvement body, but the uneven part can be molded according to the construction situation, etc. Can be changed and set after curing the ground improvement body. Thereby, according to a construction condition etc., since the construction order of a recessed part can be changed flexibly, improvement of construction property can be aimed at and a construction period can be shortened.

地盤改良体の平面図Top view of ground improvement body 地盤改良体及び構造物の基礎を示す断面図Sectional view showing foundation of ground improvement body and structure 凹部の施工状況を示す図The figure which shows the construction situation of a crevice 凹凸部を成型した地盤改良体を示す斜視図The perspective view which shows the ground improvement object which formed the uneven part

本発明に係る地盤改良体に対する凹凸部の成型方法の実施形態を図面に基づいて説明する。
例えば、軟弱地盤等の地盤１（図１参照）上に構造物を構築する際には、図２に示すように、地盤改良した地盤改良体２を構築し、その地盤改良体２の上に構造物の基礎３を構築している。 An embodiment of a method for forming an uneven portion for a ground improvement body according to the present invention will be described with reference to the drawings.
For example, when constructing a structure on the ground 1 such as soft ground (see FIG. 1), as shown in FIG. 2, a ground improved body 2 with improved ground is constructed, and the ground improved body 2 is placed on the ground improved body 2. The foundation 3 of the structure is constructed.

地盤改良体２は、図１及び図４に示すように、オーガ（図示省略）等により地盤１を掘削しながら、掘削土と地盤改良材（例えば、セメントミルク等）とを混合、攪拌して、柱状体（例えば、円形状の柱状体）として造成されている。そして、地盤改良体２は、隣接する地盤改良体２の外周部同士を重複させる状態で複数の地盤改良体２にて一連の壁状体となるように造成されている。また、図示は省略するが、地盤改良体２は、平面視で地盤１を格子状に囲むように造成されている。   As shown in FIGS. 1 and 4, the ground improvement body 2 mixes and agitates excavated soil and a ground improvement material (for example, cement milk) while excavating the ground 1 with an auger (not shown) or the like. The columnar body (for example, a circular columnar body) is formed. And the ground improvement body 2 is constructed | assembled so that it may become a series of wall-like bodies in the some ground improvement body 2 in the state which makes the outer peripheral part of the adjacent ground improvement body 2 overlap. Moreover, although illustration is abbreviate | omitted, the ground improvement body 2 is formed so that the ground 1 may be enclosed in a grid | lattice form by planar view.

地盤改良体２の天端２ａには、図２に示すように、地盤改良体２が連続する長さ方向において、凹部５と凸部６とが交互に配設された凹凸部４が成型されている。凹凸部４は、地盤改良体２の天端２ａに凹部５を施工することで成型されている。凹凸部４における凹部５は、構造物の基礎３（コンクリート基礎）に呑み込まれている。このように、凹凸部４を成型することで、地震時や強風時等に構造物に水平力が生じても、その水平力を地盤改良体２の凹凸部４に伝達して、構造物に生じる水平力に対して、地盤改良体２と構造物の基礎３との間の摩擦抵抗力を高めるようにしている。   As shown in FIG. 2, the top and bottom ends 2a of the ground improvement body 2 are formed with uneven portions 4 in which concave portions 5 and convex portions 6 are alternately arranged in the length direction in which the ground improvement body 2 continues. ing. The concavo-convex portion 4 is formed by constructing a concave portion 5 in the top end 2a of the ground improvement body 2. The recess 5 in the concavo-convex portion 4 is swallowed into the foundation 3 (concrete foundation) of the structure. In this way, by molding the concavo-convex portion 4, even if a horizontal force is generated in the structure during an earthquake or a strong wind, the horizontal force is transmitted to the concavo-convex portion 4 of the ground improvement body 2 to the structure. The frictional resistance between the ground improvement body 2 and the foundation 3 of the structure is increased with respect to the generated horizontal force.

凹凸部４における凹部５は、図２に示すように、その断面形状（地盤改良体２が連続する長さ方向で縦断したときの断面形状）が半円形状とされている。ちなみに、凹部５の断面形状は、必ずしも、円形の半分又は略半分となる半円形状とするものに限らず、例えば、円弧の長さを円形の半分よりも設定長さ分だけ長く又は短くすることも可能であり、円形における円弧の長さについては適宜変更することが可能である。凹部５は、地盤改良体２が連続する長さ方向に所定間隔を隔てて複数備えられている。凹部５は、地盤改良体２が連続する長さ方向に対して直交する横幅方向に沿って、地盤改良体２の全長に亘る状態で備えられている。凹部５の深さや地盤改良体２が連続する長さ方向における幅については適宜変更が可能である。   As shown in FIG. 2, the recess 5 in the concavo-convex portion 4 has a semicircular cross-sectional shape (a cross-sectional shape when the ground improvement body 2 is vertically cut in the continuous length direction). Incidentally, the cross-sectional shape of the concave portion 5 is not necessarily limited to a semicircular shape that is half or substantially half of a circle. For example, the length of an arc is longer or shorter than a half of a circle by a set length. It is also possible, and the length of the circular arc can be changed as appropriate. A plurality of recesses 5 are provided at predetermined intervals in the length direction in which the ground improvement body 2 continues. The recessed part 5 is provided in the state covering the full length of the ground improvement body 2 along the horizontal width direction orthogonal to the length direction where the ground improvement body 2 continues. The depth of the recess 5 and the width in the length direction in which the ground improvement body 2 continues can be appropriately changed.

このように、凹部５の断面形状を半円形状としているので、凹部５の深さを大きくしても、例えば、凹部５の上縁部の両側部に応力集中することがない。よって、凹部５単体の大きさを大きくすることができ、全体における凹部５の必要個数の低減を図ることができる。しかも、凹部５の断面形状を半円形状とすることで、構造物に生じる水平力を凹凸部４によって地盤改良体２に伝達する際に、応力集中が発生し難く、凹凸部４の断面形状が欠損し難くなる。これにより、地震時や強風時等に構造物に水平力が生じても、凹凸部４によって、その水平力を適切に地盤改良体２に伝達することができ、構造物に生じる水平力に対して、地盤改良体２と構造物の基礎３との間での摩擦抵抗力の向上を適切に図ることができる。   Thus, since the cross-sectional shape of the recess 5 is a semicircular shape, even if the depth of the recess 5 is increased, for example, stress is not concentrated on both sides of the upper edge of the recess 5. Therefore, the size of the single recess 5 can be increased, and the required number of the recesses 5 can be reduced as a whole. In addition, by making the cross-sectional shape of the concave portion 5 a semicircular shape, it is difficult for stress concentration to occur when the horizontal force generated in the structure is transmitted to the ground improvement body 2 by the concave-convex portion 4. Is difficult to lose. As a result, even if a horizontal force is generated in the structure during an earthquake or a strong wind, the uneven force 4 can appropriately transmit the horizontal force to the ground improvement body 2, and against the horizontal force generated in the structure. Thus, it is possible to appropriately improve the frictional resistance between the ground improvement body 2 and the foundation 3 of the structure.

上述のような地盤改良体２、及び、凹凸部４を構築する場合には、まず、オーガ等により地盤改良体２を造成し、その地盤改良体２の天端のレベルを調整する天端出しを行った上で、地盤改良体２の天端２ａに凹部５を施工して凹凸部４を成型している。   When constructing the ground improvement body 2 and the concavo-convex portion 4 as described above, first, the ground improvement body 2 is created by an auger or the like, and the top edge of the top edge of the ground improvement body 2 is adjusted. Then, the concave portion 5 is formed on the top end 2a of the ground improvement body 2, and the concave and convex portion 4 is molded.

天端出しでは、バックホー等の重機９（図３参照）を用いて空堀部の掘削や地盤改良体２の天端２ａを掘削することで、地盤改良体２の天端２ａのレベルを調整している。また、凹部５についても、バックホー等の重機９（図３参照）を用いて地盤改良体２の天端２ａを掘削することで、凹部５を施工している。   At the top end, the level of the top end 2a of the ground improvement body 2 is adjusted by excavating the sky moat and the top end 2a of the ground improvement body 2 using a heavy machine 9 such as a backhoe (see FIG. 3). ing. Moreover, also about the recessed part 5, the recessed part 5 is constructed by excavating the top end 2a of the ground improvement body 2 using heavy machinery 9 (refer FIG. 3), such as a backhoe.

ここで、凹部５を施工するに当たり、凹部５の形状を適切な形状とすること、及び、施工時間の短縮化が望まれている。そこで、凹部５を施工する工法として、バックホー等の重機９にどのような作業機を取り付けて施工する工法がよいのかを検証するために、下記の表に示すように、凹部５の試験施工を行った。   Here, when constructing the recess 5, it is desired to make the shape of the recess 5 an appropriate shape and to shorten the construction time. Therefore, as shown in the following table, the test construction of the recess 5 is performed in order to verify what kind of work machine is attached to the heavy equipment 9 such as a backhoe as a construction method for constructing the recess 5. went.

Figure 2018096037
Figure 2018096037

この試験施工では、バックホー等の重機９に作業機を取り付けて、その作業機にて地盤改良体２の天端２ａを掘削して凹部５を施工する重機９を用いた工法と、斫工の人為作業により地盤改良体２の天端２ａを掘削して凹部５を施工する人為作業による工法とを実施した。そして、重機９を用いた工法では、重機９に取り付ける作業機を、バケット、回転刃７を有する切削機８（図３参照）、削岩機（打撃式）の夫々に切り替えて実施した。   In this test construction, a work machine is attached to a heavy machine 9 such as a backhoe, and the construction method using the heavy machine 9 for excavating the top end 2a of the ground improvement body 2 and constructing the recess 5 with the work machine, The artificial work method of excavating the top end 2a of the ground improvement body 2 by human work and constructing the recess 5 was carried out. And in the construction method using the heavy machinery 9, the working machine attached to the heavy machinery 9 was switched to the cutting machine 8 (refer FIG. 3) which has a bucket and the rotary blade 7, and the rock drill (striking type), respectively, and implemented.

凹部５については、３箇所施工するものとして、ＡパターンとＢパターンとの夫々において、凹部５の施工を行った。Ａパターンは、地盤改良体２を造成してその地盤改良体２の養生後（例えば、２８日養生後）に、天端出し、凹部５の施工を順次行うパターンである。Ｂパターンは、地盤改良体２を造成してその地盤改良体２の養生前に、天端出し、凹部５の施工を順次行うパターンである。   About the recessed part 5, as what is constructed in three places, the recessed part 5 was constructed in each of the A pattern and the B pattern. The A pattern is a pattern in which, after the ground improvement body 2 is created and the ground improvement body 2 is cured (for example, after 28 days of curing), the top end is formed and the recess 5 is applied in sequence. The B pattern is a pattern in which the ground improvement body 2 is created and the top edge is formed and the recess 5 is constructed before the ground improvement body 2 is cured.

天端出しについては、重機９にバケットを取り付けて作業を行った後、重機９に取り付ける作業機をバケットから切削機８（図３参照）に切り替えて、レベル調整を行う工法を実施した。その結果、問題なく、天端出しを行えることが確認できた。   For the top end, after carrying out the work with the bucket attached to the heavy machine 9, the work machine attached to the heavy machine 9 was switched from the bucket to the cutting machine 8 (see FIG. 3), and a method of adjusting the level was carried out. As a result, it was confirmed that the top edge could be removed without problems.

上記の表に示されているように、凹部５の施工については、重機９にバケットを取り付けて凹部５の施工を実施した場合に、Ａパターンでは凹部５を施工することができず、Ｂパターンでは、所要時間が１０分であり、凹部５の形状の評価は「△」であった。重機９に切削機８を取り付けて凹部５の施工を実施した場合には、Ａパターン及びＢパターンの何れにおいても、所要時間が３分であり、凹部５の形状の評価は「◎」であった。重機９に削岩機を取り付けて凹部５の施工を実施した場合には、Ａパターン及びＢパターンの何れにおいても、所要時間が１３分であり、凹部５の形状の評価は「◎」であった。   As shown in the above table, for the construction of the concave portion 5, when the concave portion 5 is constructed by attaching a bucket to the heavy machine 9, the concave portion 5 cannot be constructed in the A pattern, and the B pattern Then, the required time was 10 minutes, and the evaluation of the shape of the recess 5 was “Δ”. When the cutting machine 8 was attached to the heavy machine 9 and the recess 5 was applied, the required time was 3 minutes for both the A pattern and the B pattern, and the evaluation of the shape of the recess 5 was “◎”. It was. When the rock drill was attached to the heavy machine 9 and the recess 5 was constructed, the required time was 13 minutes for both the A pattern and the B pattern, and the evaluation of the shape of the recess 5 was “「 ”. It was.

また、重機９に削岩機を取り付けて作業を行った後、斫工が人為作業を行うことで凹部５を施工した場合には、Ａパターン及びＢパターンの何れにおいても、所要時間が１０分であり、凹部５の形状の評価は「○」であった。また、斫工が人為作業を行うことで凹部５を施工した場合には、Ａパターン及びＢパターンの何れにおいても、所要時間が１３分であり、凹部５の端部に割れが生じていることから、凹部５の形状の評価は「△」であった。   In addition, after the work is performed with the rock drill attached to the heavy machine 9, when the concave part 5 is constructed by performing a manual work by a forge, the required time is 10 minutes in both the A pattern and the B pattern. The evaluation of the shape of the recess 5 was “◯”. In addition, when the concave part 5 is constructed by an artificial work performed by a craftworker, the required time is 13 minutes in both the A pattern and the B pattern, and the end of the concave part 5 is cracked. Thus, the evaluation of the shape of the recess 5 was “Δ”.

上述の試験施工の結果を踏まえて、この実施形態では、天端出しについて、重機９にバケットを取り付けて作業を行った後、重機９に取り付ける作業機をバケットから切削機８に切り替えて、レベル調整を行う工法を採用している。また、凹部５の施工については、図３に示すように、回転刃７を有する切削機８を回転駆動自在に重機９に取り付け、その切削機８にて地盤改良体２の天端２ａを切削して凹部５を施工する工法を採用している。そして、この工法にて地盤改良体２の天端２ａに凹部５を施工することで、地盤改良体２に対して凹凸部４を成型している。   Based on the results of the above test construction, in this embodiment, for the top end, after the bucket is attached to the heavy machine 9, the work machine attached to the heavy machine 9 is switched from the bucket to the cutting machine 8, and the level is changed. The method of adjustment is adopted. As for the construction of the recess 5, as shown in FIG. 3, a cutting machine 8 having a rotary blade 7 is attached to a heavy machine 9 so as to be freely rotatable, and the top end 2a of the ground improvement body 2 is cut by the cutting machine 8. And the construction method which constructs the recessed part 5 is employ | adopted. And the uneven part 4 is shape | molded with respect to the ground improvement body 2 by constructing the recessed part 5 in the top end 2a of the ground improvement body 2 with this construction method.

これにより、凹部５を施工する場合に、回転刃７を回転駆動することで、地盤改良体２の天端２ａを円弧状に掘削できることから、断面形状が半円形状の凹部５を簡易に且つ適切な形状に施工することができる。例えば、バックホーに取り付けた切削機８にて地盤改良体２の天端２ａを切削するに当たり、地盤改良体２が連続する長さ方向では大きく切削機８を移動させることなく、地盤改良体２が連続する長さ方向に直交する横幅方向に沿って切削機８を移動させるだけで、断面形状が半円形状の凹部５を施工することができる。しかも、このような凹部５の施工に要する時間の短縮化を図ることができ、施工性の向上を効果的に図ることができる。   Thereby, when constructing the recess 5, the top edge 2 a of the ground improvement body 2 can be excavated in an arc shape by rotationally driving the rotary blade 7. Therefore, the recess 5 having a semicircular cross section can be easily and It can be constructed in an appropriate shape. For example, when cutting the top end 2a of the ground improvement body 2 with the cutting machine 8 attached to the backhoe, the ground improvement body 2 is not moved greatly in the length direction in which the ground improvement body 2 continues without moving the cutting machine 8 greatly. The concave part 5 having a semicircular cross-sectional shape can be constructed only by moving the cutting machine 8 along the lateral width direction orthogonal to the continuous length direction. In addition, it is possible to shorten the time required for the construction of the concave portion 5 and to effectively improve the workability.

そして、凹部５を施工する時期については、地盤改良体２を造成した後の地盤改良体２の養生前（パターンＢ）に、凹部５を簡易に且つ短時間（例えば、３つの凹部５の所要時間が３分）で施工することができるだけでなく、地盤改良体２を造成した後の地盤改良体２の養生後（パターンＡ）に、凹部５を簡易に且つ短時間（例えば、３つの凹部５の所要時間が３分）で施工することができる。例えば、地盤改良体２を造成した後、直ぐに凹部５を施工できる場合には、地盤改良体２の養生前に凹部５を短時間で施工することができる。そして、施工状況等に応じて、地盤改良体２を造成した後、直ぐに凹部５を施工できない場合には、地盤改良体２の養生後に凹部５を短時間で施工することができる。   And about the time of constructing the recessed part 5, before the curing of the ground improvement body 2 after forming the ground improvement body 2 (pattern B), the recessed part 5 is simply and for a short time (for example, required for the three recessed parts 5). In addition to being able to be constructed in 3 minutes), after the ground improvement body 2 is cured (pattern A) after the ground improvement body 2 has been created (pattern A), the concave portion 5 can be easily and in a short time (for example, three concave portions). 5 required time is 3 minutes). For example, when the concave portion 5 can be constructed immediately after the ground improvement body 2 is created, the concave portion 5 can be constructed in a short time before the ground improvement body 2 is cured. And according to the construction situation etc., after forming the ground improvement body 2, when the recessed part 5 cannot be constructed immediately, the recessed part 5 can be constructed in a short time after the ground improvement body 2 is cured.

２ 地盤改良体
２ａ 地盤改良体の天端
４ 凹凸部
５ 凹部
７ 回転刃
８ 切削機
９ 重機 2 Ground improvement body 2a Top edge 4 of ground improvement body Concave and convex part 5 Concave part 7 Rotary blade 8 Cutting machine 9 Heavy machine

Claims (3)

地盤改良体の天端に水平力伝達用の凹凸部を成型する地盤改良体に対する凹凸部の成型方法であって、
回転刃を有する切削機を回転駆動自在に重機に取り付け、その切削機にて地盤改良体の天端を切削して前記凹凸部を成型する地盤改良体に対する凹凸部の成型方法。 A method for forming an uneven portion for a ground improvement body, in which an uneven portion for transmitting a horizontal force is formed at the top of the ground improvement body,
A method for forming a concavo-convex portion with respect to a ground improvement body, wherein a cutting machine having a rotary blade is attached to a heavy machine so as to be rotationally driven and the top end of the ground improvement body is cut with the cutting machine to form the concavo-convex portion. 前記凹凸部における凹部の断面形状を半円形状とする請求項１に記載の地盤改良体に対する凹凸部の成型方法。   The method for forming an uneven portion for a ground improvement body according to claim 1, wherein a cross-sectional shape of the recessed portion in the uneven portion is a semicircular shape. 前記凹凸部の成型時期は、前記地盤改良体の養生前、及び、前記地盤改良体の養生後に設定可能とする請求項１又は２に記載の地盤改良体に対する凹凸部の成型方法。   The molding method of the uneven portion for the ground improvement body according to claim 1 or 2, wherein the molding time of the uneven portion can be set before curing the ground improvement body and after curing the ground improvement body.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6210323A (en) * 1985-07-04 1987-01-19 Ohbayashigumi Ltd Connecting work of continuous underground wall panel and excavator therefor
JPH09195269A (en) * 1996-01-19 1997-07-29 Ohbayashi Corp Wall surface chipping machine
JPH10292410A (en) * 1997-04-11 1998-11-04 Sada Kensetsu Kk Execution method for small-diameter shaft, connecting method for small-diameter shaft and buried pipe, and connecting method for buried pipe utilizing small-diameter shaft
US20120119562A1 (en) * 2010-11-12 2012-05-17 Latham Winchester E Mine safety system
JP2012107446A (en) * 2010-11-18 2012-06-07 Takenaka Komuten Co Ltd Soil improvement body and horizontal strength calculation method for soil improvement body

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6210323A (en) * 1985-07-04 1987-01-19 Ohbayashigumi Ltd Connecting work of continuous underground wall panel and excavator therefor
JPH09195269A (en) * 1996-01-19 1997-07-29 Ohbayashi Corp Wall surface chipping machine
JPH10292410A (en) * 1997-04-11 1998-11-04 Sada Kensetsu Kk Execution method for small-diameter shaft, connecting method for small-diameter shaft and buried pipe, and connecting method for buried pipe utilizing small-diameter shaft
US20120119562A1 (en) * 2010-11-12 2012-05-17 Latham Winchester E Mine safety system
JP2012107446A (en) * 2010-11-18 2012-06-07 Takenaka Komuten Co Ltd Soil improvement body and horizontal strength calculation method for soil improvement body

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