JP6796343B2 - Construction method of pile reinforcement structure and its equipment - Google Patents
Construction method of pile reinforcement structure and its equipment Download PDFInfo
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- JP6796343B2 JP6796343B2 JP2019186453A JP2019186453A JP6796343B2 JP 6796343 B2 JP6796343 B2 JP 6796343B2 JP 2019186453 A JP2019186453 A JP 2019186453A JP 2019186453 A JP2019186453 A JP 2019186453A JP 6796343 B2 JP6796343 B2 JP 6796343B2
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- 238000010276 construction Methods 0.000 title claims description 16
- 230000002787 reinforcement Effects 0.000 title claims description 8
- 238000003756 stirring Methods 0.000 claims description 19
- 230000003014 reinforcing effect Effects 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 239000012779 reinforcing material Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 description 29
- 238000013019 agitation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Piles And Underground Anchors (AREA)
Description
この発明は建物の杭の補強構造の施工に適した施工方法及びその装置に関する。 The present invention relates to a construction method and an apparatus thereof suitable for construction of a reinforcing structure for piles of a building.
耐震性の向上等の見地から地盤に杭を打設することが多い。建物に対して充分な支持力を確保するためには、杭の打設数を多くしたり、杭長を長くしたりすればよいが、何れも杭打設の手間が増え、コストも嵩むこととなる。
簡易な方法でかつコストをかけずに杭の支持力を増強する方法を鋭意検討してきた結果、杭の周囲の地盤を除去し杭を露出させ、得られた空間に骨材等の補強材料を投入して締め固めて補強層を形成してなる杭補強構造が特許文献１に開示されている。この杭補強構造を構築することにより、建物に対する支持力が格段に向上する。
なお、建物のフーチング等の下面は杭及び補強層の両者に当接するものとする。
本発明に関連する技術を開示する文献として特許文献２、３を参照されたい。
Pile is often placed on the ground from the viewpoint of improving earthquake resistance. In order to secure sufficient bearing capacity for the building, it is sufficient to increase the number of piles to be driven and to increase the length of the piles, but both of these require more labor and cost. It becomes.
As a result of diligently studying a simple method and cost-effective method to increase the bearing capacity of the pile, the ground around the pile is removed to expose the pile, and a reinforcing material such as aggregate is added to the obtained space.
The lower surface of the footing of the building, etc. shall be in contact with both the pile and the reinforcing layer.
Please refer to
かかる杭補強構造の使用を広めるには、簡易かつ安価な施工方法の確立が必要である。 In order to spread the use of such pile reinforcement structure, it is necessary to establish a simple and inexpensive construction method.
この発明は、上記な杭補強構造の施工に適した施工方法の提供を目的とする。
即ち、この発明の第１の局面は次のように規定される。
地盤に杭を打設し、該杭の周囲に補強層を形成する杭補強構造の施工方法であって、
打設された前記杭より大径な筒部と該筒部の外周に形成された撹拌翼とを備えたオーガーを準備し、前記筒部を前記杭へ外挿しつつ回転させ、該筒部からセメントミルク等の固化材を前記杭の周囲に注入する、
ことを特徴とする杭補強構造の施工方法。
An object of the present invention is to provide a construction method suitable for construction of the above-mentioned pile reinforcing structure.
That is, the first aspect of the present invention is defined as follows.
It is a construction method of a pile reinforcement structure in which piles are driven into the ground and a reinforcing layer is formed around the piles.
An auger having a cylinder portion having a diameter larger than that of the pile placed and a stirring blade formed on the outer circumference of the cylinder portion is prepared, and the cylinder portion is rotated while being externally inserted into the pile, and the cylinder portion is used from the cylinder portion. Inject a solidifying material such as cement milk around the pile,
A method of constructing a pile reinforcement structure, which is characterized by this.
このように規定される第１の局面の施工方法によれば、打設された杭へ筒部を外挿した状態でオーガーを回転させるので、オーガーの回転に杭が何ら干渉せず、オーガーによる作業効率が向上する。
また、杭の軸とオーガーの軸とが一致するので、オーガーの回転及び固化材の注入により形成される補強層が杭の周囲に均一に形成され、もって補強層による補強効果が安定する。
According to the construction method of the first aspect defined in this way, since the auger is rotated with the cylinder portion externally inserted into the driven pile, the pile does not interfere with the rotation of the auger and the auger is used. Work efficiency is improved.
Further, since the axis of the pile and the axis of the auger coincide with each other, the reinforcing layer formed by the rotation of the auger and the injection of the solidifying material is uniformly formed around the pile, and the reinforcing effect of the reinforcing layer is stabilized.
ここに、杭の形状、材質、深さ等は要求される強度等に応じて任意に選択することができる。この杭は予め地盤に打設されている。オーガーの先端に杭用のアタッチメントを取り付け、このアタッチメントを介してオーガーの先端に杭を取り付けてこれを地盤へ打設することができる。
その後、オーガーと杭との連結を開放し、オーガーの筒部が杭へ外挿されるようにセットする。
Here, the shape, material, depth and the like of the pile can be arbitrarily selected according to the required strength and the like. This pile has been driven into the ground in advance. An attachment for a pile can be attached to the tip of the auger, and a pile can be attached to the tip of the auger through this attachment and placed on the ground.
After that, the connection between the auger and the pile is released, and the auger tube is set so as to be externally inserted into the pile.
オーガーは筒部と撹拌翼とを備える。筒部の下端は解放されており、杭へかぶさるように外挿される。筒部の内径寸法は筒部を回転させたときの両者の干渉を防止しつつ、筒部と杭との空間を固化材が円滑に流れ、外部へ押しだされていくものとする。なお、筒部の強度確保及び流出抵抗を小さくする見地から、筒部下端の内周と杭との間から固化材を外部へ押しだすことが好ましい。
固化材は補強層に要求される強度等に応じて任意に選択できるものである。
The auger includes a cylinder and a stirring blade. The lower end of the cylinder is open and is externally inserted so as to cover the pile. The inner diameter of the cylinder is such that the solidifying material flows smoothly through the space between the cylinder and the pile and is pushed out while preventing interference between the two when the cylinder is rotated. From the viewpoint of ensuring the strength of the cylinder and reducing the outflow resistance, it is preferable to push the solidifying material outward from between the inner circumference of the lower end of the cylinder and the pile.
The solidifying material can be arbitrarily selected according to the strength required for the reinforcing layer and the like.
オーガーを第１の方向へ回転（正転）させて、杭の周囲の地盤を除去し、その後、除去された地盤の領域にオーガーの筒部から固化材を注入し、オーガーを回転させて注入された固化材を撹拌する。
杭の周囲の地盤を除去する際にも、オーガーの筒部を杭に外挿することで、地盤除去作業時に杭の干渉を避けることができるので、この作業が容易になる。また、杭を中心として、その周囲から均等に地盤を除去できる。
除去された地盤の領域へ予め骨材を投入し、その後固化材を注入してオーガーを回転させてもよい。
地盤を除去することなく、オーガーで杭周囲の地盤を撹拌しつつ固化材を注入し、杭の周囲に固化材と原土とからなる補強層を形成することもできる。
The auger is rotated in the first direction (normal rotation) to remove the ground around the pile, and then the solidifying material is injected from the tube of the auger into the area of the removed ground, and the auger is rotated to inject. Stir the solidified material.
When removing the ground around the pile, by extrapolating the auger cylinder to the pile, interference of the pile can be avoided during the ground removal work, which facilitates this work. In addition, the ground can be removed evenly from the center of the pile.
Aggregates may be charged in advance into the area of the ground that has been removed, and then solidified material may be injected to rotate the auger.
Without removing the ground, the solidifying material can be injected while stirring the ground around the pile with an auger to form a reinforcing layer consisting of the solidifying material and the raw soil around the pile.
以下、発明の実施形態の杭補強構造の施工方法を示す。
図１は地盤１に打設された杭２の周囲の地盤をオーガー４により除去する様子を示す。このオーガー４は杭２より大径な筒部５とその外周面に形成されたらせん状の撹拌翼６と有する。ここにおいて、符号７は回転ロッドであり図示しない杭打設機により回転かつ上下動される。符号８はオーガー４により形成された空間であり、図に示す通り、杭２にオーガー４の筒部５を外挿することにより、杭２を中心として空間８が水平方向に均等に形成される。
上記において、回転ロッド７と筒部５とは内部で連通しており、回転ロッド７の上端側から筒部５の内部に流動性のある固化材が注入される。
Hereinafter, a method of constructing the pile reinforcing structure according to the embodiment of the present invention will be shown.
FIG. 1 shows how the
In the above, the
杭２の周囲から地盤を除去した後、回転ロッド７側から固化材１０を注入し、筒部５の下端側から固化材１０を吐出させて空間８を充填する。オーガー４を回転かつ上下させることより、固化材１０の撹拌、均一化を図る。これにより、杭２の周囲に補強層が形成される。筒部５が杭２へ外挿されているので、固化材１０の撹拌が均一化されることはもとより、杭２にガイドされてオーガー４の位置が安定するので空間８の周壁の崩壊が防止される。
上記において、固化材１０撹拌時のオーガー４の回転方向は、地盤除去時の回転方向と逆方向であることが好ましいが、撹拌を促進させるために、オーガー４の回転方向を作業途中に切り替えることもできる。
図３は、形成された空間８の底部へ骨材を投入後、固化材１０の注入、撹拌を実行する例を示す。
After removing the ground from the periphery of the
In the above, the rotation direction of the
FIG. 3 shows an example in which the solidifying material 10 is injected and stirred after the aggregate is put into the bottom of the
図４には、他のタイプのオーガー１４を示す。このオーガー１４では、筒部５の下端から、一対の棒状の撹拌翼１６が突設された構成である。撹拌翼１６の形状、形成位置及び本数は任意に選択できることは勿論である。
かかるオーガー１４は、図５に示すように、骨材１２と固化材１０との撹拌に好適である。
FIG. 4 shows another type of
As shown in FIG. 5, such an
図６の例では、杭２の周囲の地盤を除去することなく、オーガー４の筒部５を杭２へ外挿した状態で、回転かつ上下動させて杭２の周囲の地盤を撹拌しつつ、固化材を注入する。これにより、杭２の周縁の地盤が補強層となる。この作業においても、杭２とオーガー４との干渉が防止されつつ、杭２の周囲に均等に補強層が形成される。
図７には筒部５の下端のみに撹拌翼１４を設けたタイプのオーガー１４を用いた例を示す。
In the example of FIG. 6, the
FIG. 7 shows an example in which an
この発明は、上記発明の実施例の説明に何ら限定されるものではない。特許請求の範囲の記載を逸脱せず、当業者が容易に想到できる範囲で種々の変形態様もこの発明に含まれる。 The present invention is not limited to the description of the examples of the above invention. Various modifications are also included in the present invention as long as those skilled in the art can easily conceive without departing from the description of the scope of claims.
１ 地盤
２ 杭
４、１４ オーガー
５、筒部
６、１６ 撹拌翼
１０ 固化材
１２ 骨材
1
以下の事項を開示する。
（１）
下端側で解放して、地盤に打設された杭に外挿される筒部と該筒部に形成された撹拌翼とを備えたオーガー、及び
該オーガーの上端側へ接続され、前記筒部内へ固化材を注入する回転ロッド、を備える施工装置であって、
前記回転ロッドと前記筒部とは内部で連通しており、前記固化材は前記杭の上方から前記杭へ向けて注入される、施工装置。
（２）
前記撹拌翼は螺旋状の板から成る、（１）記載の施工装置。
（３）
前記撹拌翼は前記筒部の下端から突出する一対の棒状の撹拌翼である、（１）記載の施工装置。
The following matters will be disclosed.
(1)
An auger equipped with a cylinder portion that is released on the lower end side and externally inserted into a pile driven into the ground and a stirring blade formed on the cylinder portion, and is connected to the upper end side of the auger and into the cylinder portion. A construction device equipped with a rotary rod for injecting a solidifying material.
A construction device in which the rotating rod and the tubular portion are internally communicated with each other, and the solidifying material is injected from above the pile toward the pile.
(2)
The construction apparatus according to (1), wherein the stirring blade is composed of a spiral plate.
(3)
The construction apparatus according to (1), wherein the stirring blade is a pair of rod-shaped stirring blades protruding from the lower end of the tubular portion.
Claims (1)
打設された前記杭より大径な筒部と該筒部の外周に形成された撹拌翼とを備えたオーガーを準備し、前記筒部を前記杭へ外挿する第１のステップと、
前記第１のステップの後、前記筒部を前記杭へ外挿しつつ該筒部を正転させることにより打設された前記杭の周囲の地盤を除去する第２のステップと、
前記第２のステップの後、前記地盤が除去された領域に補強材料を充填し、その後、前記杭に対して前記筒部を外挿しつつ、前記オーガーを逆転させる第３のステップと、を有し、
前記オーガーは、前記筒部を前記杭へ外挿したとき前記杭の周面から前記筒部の内周面までの径方向の距離よりも前記筒部の外周面から前記撹拌翼の縁までの径方向の距離の方が大である、を備える杭補強構造の施工方法。 It is a construction method of a pile reinforcement structure in which piles are driven into the ground and a reinforcing layer is formed around the piles.
A first step of preparing an auger having a cylinder portion having a diameter larger than that of the driven pile and a stirring blade formed on the outer periphery of the cylinder portion, and extrapolating the cylinder portion to the pile.
After the first step, a second step of removing the ground around the pile placed by rotating the cylinder part in the normal direction while externally inserting the cylinder part into the pile.
After the second step, the area from which the ground has been removed is filled with a reinforcing material, and then a third step of reversing the auger while extrapolating the cylinder portion to the pile is provided. And
When the auger is externally inserted into the pile, the auger extends from the outer peripheral surface of the cylinder to the edge of the stirring blade rather than the radial distance from the peripheral surface of the pile to the inner peripheral surface of the cylinder. A method of constructing a pile reinforcement structure that comprises a larger radial distance.
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| JPS5664020A (en) * | 1979-10-30 | 1981-06-01 | Asahi Chem Ind Co Ltd | Expanded diameter pile and diameter-expanding work for existing pile |
| JPH07279171A (en) * | 1994-04-11 | 1995-10-24 | Maruyasu Doboku Kk | Soil cement composite pile, and execution method and execution device therefor |
| JP3399666B2 (en) * | 1994-11-08 | 2003-04-21 | 清水建設株式会社 | Ground improvement method and ground improvement equipment used for it |
| JP3668219B2 (en) * | 2001-09-28 | 2005-07-06 | 株式会社ジオトップ | Construction method of ready-made piles |
| KR101156363B1 (en) * | 2010-12-28 | 2012-06-13 | 이광영 | Construction method of spiral steel pipe |
| JP6334761B2 (en) * | 2017-02-27 | 2018-05-30 | 株式会社新生工務 | Pile reinforcement structure construction method and apparatus |
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