JP2012002012A - Landslide prevention pile, landslide prevention method and construction method for landslide prevention pile - Google Patents

Landslide prevention pile, landslide prevention method and construction method for landslide prevention pile Download PDF

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JP2012002012A
JP2012002012A JP2010139643A JP2010139643A JP2012002012A JP 2012002012 A JP2012002012 A JP 2012002012A JP 2010139643 A JP2010139643 A JP 2010139643A JP 2010139643 A JP2010139643 A JP 2010139643A JP 2012002012 A JP2012002012 A JP 2012002012A
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pile
ground
landslide prevention
main body
steel pipe
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JP5595137B2 (en
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Eiichiro Saeki
英一郎 佐伯
Nobuaki Sakurai
信彰 櫻井
Masamichi Sawaishi
正道 澤石
Akira Owada
章 大和田
Makoto Nagata
誠 永田
Masatoshi Wada
昌敏 和田
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Nippon Steel Engineering Co Ltd
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Nippon Steel Engineering Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a new and a reformed landslide prevention pile, a landslide prevention method and a construction method for the landslide prevention pile capable of speedily and simply improving a shear resistance of the ground to stabilize the ground.SOLUTION: The present invention comprises: a pile main body 101 made by a steel pipe; a spiral blade 110 provided spirally at a tip of the pile main body or on a peripheral surface of the pile main body; and a bearing section 120 which is provided on the peripheral surface of the pile main body and is placed on a surface of a ground or embedded in the ground to generate a compressive force in the ground between the bearing section and the spiral blade. The pile main body has a plurality of through-holes that allows underground water to flow into an inside of the pile main body. The pile main body may allow the underground water to be discharged from the inside thereof to outside the ground.

Description

本発明は、地すべり防止杭、地すべり防止方法及び地すべり防止杭の施工方法に関する。   The present invention relates to a landslide prevention pile, a landslide prevention method, and a construction method of a landslide prevention pile.

盛土斜面又は切土斜面の地盤及び土留めされた地盤等に関して、これらの地盤を安定化させる技術がある。例えば、図11に示すように、地盤10は、地中にすべり面12を有し、すべり面12より法面側が移動層となり、すべり面12より地中の深い側が不動層となっている。複数の杭50がすべり面12よりも深く打設されることによって、地盤の剪断抵抗が補強され、地盤が安定化する。図11は、従来の地すべり防止杭50を示す側面図であり、地中の状態を示している。   There is a technique for stabilizing the ground on the embankment slope or the cut slope, and the earth retained on the earth. For example, as shown in FIG. 11, the ground 10 has a sliding surface 12 in the ground, the slope side of the sliding surface 12 is a moving layer, and the deeper side of the ground than the sliding surface 12 is a non-moving layer. By placing a plurality of piles 50 deeper than the sliding surface 12, the shear resistance of the ground is reinforced and the ground is stabilized. FIG. 11 is a side view showing a conventional landslide prevention pile 50 and shows a state in the ground.

また、図12に示すように、複数のアースアンカー60が硬化したグラウト62によってすべり面12より深い位置で固定され、法面で支圧板64によって緊張されて固定される。アースアンカー60に引張り力を導入することによって、地盤内に圧縮力が与えられて、地盤の剪断抵抗を増加させる。その結果、地盤が安定化する。図12は、従来のアースアンカー60を示す側面図である。   Further, as shown in FIG. 12, a plurality of earth anchors 60 are fixed at a position deeper than the sliding surface 12 by the hardened grout 62, and are tensioned and fixed by the bearing plate 64 on the slope. By introducing a tensile force to the earth anchor 60, a compressive force is applied in the ground, and the shear resistance of the ground is increased. As a result, the ground is stabilized. FIG. 12 is a side view showing a conventional earth anchor 60.

更に、特許文献1では、羽根付き回転杭を利用した斜面の安定化技術が開示されている。   Furthermore, in patent document 1, the stabilization technique of the slope using a rotary pile with a blade | wing is disclosed.

特開2007−115719号公報JP 2007-115719 A

ところで、図11に示した例では、杭50を打設するため、杭50の外周より大きく掘削して掘削穴18を設ける必要がある。また、図12に示した例や特許文献1では、液状のグラウト62を地中に加圧注入し、グラウト62を硬化させる必要がある。そのため、いずれの方法でも、コストが高く工期がかかるという問題がある。特に、グラウト62を地中に注入する場合、地盤や地下水を汚染する可能性がある。   By the way, in the example shown in FIG. 11, in order to drive the pile 50, it is necessary to excavate larger than the outer periphery of the pile 50 to provide the excavation hole 18. Moreover, in the example shown in FIG. 12 and patent document 1, it is necessary to inject | pour liquid grout 62 under pressure and harden the grout 62. Therefore, either method has a problem that the cost is high and the construction period is long. In particular, when the grout 62 is injected into the ground, the ground and groundwater may be contaminated.

そこで、本発明は、上記問題に鑑みてなされたものであり、本発明の目的とするところは、地盤の剪断抵抗を迅速かつ簡潔に向上させ、地盤を安定化させることが可能な、新規かつ改良された地すべり防止杭、地すべり防止方法及び地すべり防止杭の施工方法を提供することにある。   Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to improve the shear resistance of the ground quickly and concisely and to stabilize the ground. It is providing the improved landslide prevention pile, the landslide prevention method, and the construction method of a landslide prevention pile.

上記課題を解決するために、本発明のある観点によれば、鋼管からなる杭本体と、杭本体の先端又は周面に螺旋状に設けられた螺旋状羽根と、杭本体の周面に設けられ、地盤面に接触して又は地中に配置されて螺旋状羽根との間の地盤に圧縮力を生じさせる支圧部とを備える地すべり防止杭が提供される。   In order to solve the above-mentioned problems, according to a certain aspect of the present invention, a pile main body made of a steel pipe, a spiral blade provided in a spiral shape at the tip or peripheral surface of the pile main body, and a peripheral surface of the pile main body are provided. There is provided a landslide prevention pile including a pressure bearing portion that is disposed in contact with the ground surface or in the ground and generates a compressive force on the ground between the spiral blades.

上記杭本体は、周面に複数の貫通孔が設けられ、貫通孔は、地盤からの水を杭本体内部に通過させ、杭本体は、杭本体内部から地盤外部に水を排出してもよい。   The pile body may be provided with a plurality of through holes on the peripheral surface, the through holes may allow water from the ground to pass through the inside of the pile body, and the pile body may discharge water from the inside of the pile body to the outside of the ground. .

上記杭本体の先端が開口され、杭本体は、杭本体の先端を閉鎖するように杭本体内部に板部材が設けられるか又は杭本体内部に砂が詰められ、杭本体は、板部材より地盤面側で地盤からの水を杭本体内部から地盤外部に水を排出してもよい。   The pile main body is opened at the front end, and the pile main body is provided with a plate member inside the pile main body so as to close the front end of the pile main body, or the pile main body is filled with sand. Water from the ground may be discharged from the inside of the pile body to the outside of the ground on the surface side.

上記杭本体の地盤面側に位置する杭頭に設備機器が固定されてもよい。   The equipment may be fixed to a pile head located on the ground surface side of the pile body.

上記課題を解決するために、本発明の別の観点によれば、上記地すべり防止杭を用いて、杭本体の軸方向の抵抗力と軸直角方向の抵抗力によって、地盤のすべりに対する抵抗力を向上させる、地すべり防止方法が提供される。   In order to solve the above-mentioned problem, according to another aspect of the present invention, by using the landslide prevention pile, the resistance force against the slip of the ground is obtained by the resistance force in the axial direction of the pile body and the resistance force in the direction perpendicular to the axis. An improved landslide prevention method is provided.

上記課題を解決するために、本発明の別の観点によれば、上記杭本体が地盤内に回転貫入されたときに杭本体が発揮する引き抜き耐力と、杭本体の貫入と同時に配置される又は杭本体の貫入の後から設置される支圧部を介して、地盤に圧縮力を生じさせる、地すべり防止方法が提供される。   In order to solve the above-mentioned problem, according to another aspect of the present invention, the pile body is disposed simultaneously with the penetration of the pile body and the pulling-out strength exhibited by the pile body when the pile body is rotated and penetrated into the ground, or There is provided a landslide prevention method for generating a compressive force on the ground through a bearing part installed after the penetration of the pile body.

上記課題を解決するために、本発明の別の観点によれば、上記杭本体が地盤内に回転圧入されたときに螺旋状羽根の貫入によって生じる地盤反力により、地盤に圧縮力を生じさせる、地すべり防止方法が提供される。   In order to solve the above-mentioned problem, according to another aspect of the present invention, when the pile main body is rotationally press-fitted into the ground, a ground reaction force generated by the penetration of the spiral blades generates a compressive force on the ground. A landslide prevention method is provided.

上記課題を解決するために、本発明の別の観点によれば、砂が内部に充填された鋼管からなる管本体と、管本体の周面に螺旋状に設けられた第一の螺旋状羽根とを有する管を地盤内に回転貫入するステップと、周面に複数の貫通孔が設けられ、中空の鋼管又は砂が充填された鋼管からなる杭本体と、杭本体の周面に螺旋状に設けられた第二の螺旋状羽根とを有する地すべり防止杭を管内部に回転貫入するステップと、砂を地盤に残して管を地盤から回転しながら撤去するステップと、杭本体の上部に設けられる支圧部を地盤面に接触又は地中に配置させるステップと、第二の螺旋状羽根と支圧部との間の地盤に圧縮力を生じさせるステップとを含む、地すべり防止杭の施工方法が提供される。   In order to solve the above problems, according to another aspect of the present invention, a pipe body made of a steel pipe filled with sand, and a first spiral blade spirally provided on the peripheral surface of the pipe body A pile main body comprising a hollow steel pipe or a steel pipe filled with sand, and a spiral shape on the peripheral surface of the pile main body. A step of rotating and penetrating a landslide prevention pile having a second spiral blade provided inside the pipe, a step of removing the pipe while rotating the ground from the ground while leaving sand on the ground, and an upper portion of the pile body are provided. A method for constructing a landslide prevention pile, comprising the step of contacting or placing the bearing part in contact with the ground surface and the step of generating a compressive force on the ground between the second spiral blade and the bearing part. Provided.

上記課題を解決するために、本発明の別の観点によれば、周面に貫通した複数の貫通孔が設けられ、砂が内部に充填された鋼管からなら杭本体と、杭本体の周面に螺旋状に設けられた螺旋状羽根とを有する地すべり防止杭を地盤内に回転貫入するステップと、回転貫入と同時に又は回転貫入の後で、鋼管の内部に充填された砂に圧縮力を掛け、砂を鋼管の貫通孔から鋼管の外部へ排出するステップと、杭本体の上部に設けられる支圧部を地盤面に接触又は地中に配置させるステップと、螺旋状羽根と支圧部との間の地盤に圧縮力を生じさせるステップとを含む、地すべり防止杭の施工方法が提供される。   In order to solve the above-mentioned problem, according to another aspect of the present invention, a pile main body provided with a plurality of through holes penetrating the peripheral surface and filled with sand, and the peripheral surface of the pile main body A step of rotating a landslide prevention pile having a spiral blade provided in a spiral shape into the ground, and applying a compressive force to the sand filled in the steel pipe simultaneously with the rotation penetration or after the rotation penetration. A step of discharging sand from the through hole of the steel pipe to the outside of the steel pipe, a step of contacting or placing the bearing section provided on the top of the pile body in the ground surface, and the spiral blade and the bearing section. A method for constructing a landslide prevention pile including a step of generating a compressive force on the ground in between is provided.

以上説明したように本発明によれば、地盤の剪断抵抗を迅速かつ簡潔に向上させ、地盤を安定化させることができる。   As described above, according to the present invention, the shear resistance of the ground can be improved quickly and simply, and the ground can be stabilized.

本発明の第1の実施形態に係る地すべり防止杭を示す側面図である。It is a side view which shows the landslide prevention pile which concerns on the 1st Embodiment of this invention. 同実施形態に係る地すべり防止杭を示す側面図である。It is a side view which shows the landslide prevention pile which concerns on the same embodiment. 同実施形態に係る地すべり防止杭の施工方法を示すフローチャートである。It is a flowchart which shows the construction method of the landslide prevention pile which concerns on the embodiment. 同実施形態に係る施工中の地すべり防止杭を示す側面図である。It is a side view showing the landslide prevention pile under construction concerning the embodiment. 同実施形態に係る施工中の地すべり防止杭を示す側面図である。It is a side view showing the landslide prevention pile under construction concerning the embodiment. 本発明の第2の実施形態に係る地すべり防止杭の施工方法を示すフローチャートである。It is a flowchart which shows the construction method of the landslide prevention pile which concerns on the 2nd Embodiment of this invention. 同実施形態に係る砂が充填されたさや管を示す側面図である。It is a side view which shows the sheath pipe | tube filled with the sand which concerns on the same embodiment. 同実施形態に係る長軸方向に沿って切断した砂が充填されたさや管及び側面から見た地すべり防止杭を示す説明図である。It is explanatory drawing which shows the landslide prevention pile seen from the sheath pipe | tube filled with the sand cut | disconnected along the longitudinal direction which concerns on the embodiment, and the side surface. 同実施形態に係るさや管及び地すべり防止杭を示す側面図である。It is a side view which shows the sheath pipe and landslide prevention pile which concern on the embodiment. 本発明の第3の実施形態に係るソーラーパネル及び地すべり防止杭を示す側面図である。It is a side view which shows the solar panel and landslide prevention pile which concern on the 3rd Embodiment of this invention. 従来の地すべり防止杭を示す側面図である。It is a side view which shows the conventional landslide prevention pile. 従来のアースアンカーを示す側面図である。It is a side view which shows the conventional earth anchor.

以下に添付図面を参照しながら、本発明の好適な実施の形態について詳細に説明する。なお、本明細書及び図面において、実質的に同一の機能構成を有する構成要素については、同一の符号を付することにより重複説明を省略する。   Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

(第1の実施形態)
まず、本発明の第1の実施形態に係る地すべり防止杭100について説明する。
本実施形態に係る地すべり防止杭100は、盛土斜面又は切土斜面の地盤10及び土留めされた地盤10等を安定化させるため、地盤10内に打設される。まず、図1を参照して、本発明の第1の実施形態に係る地すべり防止杭100の構成について説明する。図1は、本実施形態に係る地すべり防止杭100を示す側面図である。
(First embodiment)
First, the landslide prevention pile 100 according to the first embodiment of the present invention will be described.
The landslide prevention pile 100 according to the present embodiment is placed in the ground 10 in order to stabilize the ground 10 of the embankment slope or the cut slope, the ground 10 that has been earthed, and the like. First, with reference to FIG. 1, the structure of the landslide prevention pile 100 which concerns on the 1st Embodiment of this invention is demonstrated. FIG. 1 is a side view showing a landslide prevention pile 100 according to the present embodiment.

地すべり防止杭100は、杭本体101と、螺旋状羽根110と、支圧板120からなる。   The landslide prevention pile 100 includes a pile body 101, a spiral blade 110, and a bearing plate 120.

杭本体101は、螺旋状羽根110が設けられた先端鋼管102と、互いに連結される複数の鋼管104からなる。地すべり防止杭100は、地盤10を開削することなく地表から回転貫入することによって打設できる。   The pile body 101 includes a tip steel pipe 102 provided with a spiral blade 110 and a plurality of steel pipes 104 connected to each other. The landslide prevention pile 100 can be placed by rotating and penetrating from the ground surface without excavating the ground 10.

先端鋼管102は、所定長さ、所定管径を有する中空の鋼管部と、鋼管部の先端に設けられた螺旋状羽根110とからなる。螺旋状羽根110は、鋼管部の周面に1周又は1周以上にわたって螺旋状に取り付けられる。螺旋状羽根110は例えばドーナツ円板状の鋼板、又はドーナツ円板状の一部からなる鋼板で形成され、螺旋状羽根110の鋼板は、鋼管部から外側に所定の幅で張り出している。鋼管部と螺旋状羽根110とは、例えば溶接によって接続される。なお、鋼管部と螺旋状羽根110との接続は、嵌合やねじ結合によって接続する場合もある。   The tip steel pipe 102 includes a hollow steel pipe portion having a predetermined length and a predetermined pipe diameter, and a spiral blade 110 provided at the tip of the steel pipe portion. The spiral blade 110 is helically attached to the circumferential surface of the steel pipe part over one or more rounds. The spiral blade 110 is formed of, for example, a donut disk-shaped steel plate or a steel plate made of a part of a donut disk shape, and the steel plate of the spiral blade 110 projects outward from the steel pipe portion with a predetermined width. The steel pipe part and the spiral blade 110 are connected by welding, for example. In addition, the connection between the steel pipe portion and the spiral blade 110 may be connected by fitting or screw connection.

更に、先端鋼管102の先端には、封止板(図示せず。)が設けられる。封止板は、鋼板で形成され、鋼管部と溶接によって接続される。   Further, a sealing plate (not shown) is provided at the tip of the tip steel tube 102. The sealing plate is formed of a steel plate and is connected to the steel pipe portion by welding.

先端鋼管102が地盤10に貫入され、螺旋状羽根110が回転することによって、打設方向前方の土が螺旋状羽根110の後方に移動する。このとき、その土の受動土圧が螺旋状羽根110や杭本体101の推進力になり、杭本体101を地中に貫入させることができる。先端鋼管102の先端に設けられた螺旋状羽根110が杭本体101を牽引するシステムであるため、直進性が高いという特徴を有する。   The tip steel tube 102 penetrates the ground 10 and the spiral blade 110 rotates, so that the soil in front of the placing direction moves to the rear of the spiral blade 110. At this time, the passive earth pressure of the soil becomes the driving force of the spiral blade 110 and the pile main body 101, and the pile main body 101 can penetrate into the ground. Since the spiral blade 110 provided at the tip of the tip steel pipe 102 is a system that pulls the pile main body 101, it has a feature of high straightness.

また、杭本体101の回転貫入よって、地盤10は先端鋼管102、鋼管104の外周に圧密されるので、排出土が発生しない。なお、上記では、封止板が、先端鋼管102の先端に設けられる例を示したが、先端鋼管102の先端は、封止板が設けられず、開口されていてもよい。   Moreover, since the ground 10 is consolidated by the outer periphery of the front-end | tip steel pipe 102 and the steel pipe 104 by rotation penetration of the pile main body 101, discharge soil does not generate | occur | produce. In the above description, the sealing plate is provided at the tip of the tip steel tube 102. However, the tip of the tip steel tube 102 may be opened without being provided with the sealing plate.

鋼管104は、所定長さ、所定管径を有する鋼管である。鋼管104は、先端鋼管102と接続される場合、螺旋状羽根110が設けられる側と反対側である先端鋼管102の後端側と接続される。また、鋼管104は、別の鋼管104とも接続される。鋼管104が順次接続されることによって、直線状の接続延長した杭本体101が形成される。なお、先端鋼管102と鋼管104との接続や、鋼管104相互の接続は、例えば溶接等によって行われる。   The steel pipe 104 is a steel pipe having a predetermined length and a predetermined pipe diameter. When the steel pipe 104 is connected to the tip steel pipe 102, the steel pipe 104 is connected to the rear end side of the tip steel pipe 102 which is the side opposite to the side where the spiral blade 110 is provided. The steel pipe 104 is also connected to another steel pipe 104. The steel pipes 104 are sequentially connected to form a pile body 101 having a linear connection extension. The connection between the tip steel pipe 102 and the steel pipe 104 and the mutual connection between the steel pipes 104 are performed by, for example, welding.

支圧板120は、支圧部の一例であり、例えば板状部材であって、杭本体101の主に上部に設けられる。なお、本発明の支圧部は、板状の支圧板120に限定されず、ブロック状の部材でもよい。支圧板120は、杭本体101が地盤10内に回転貫入され設置位置まで到達したとき、板面が地盤面に接触して又は地中に配置される。支圧板120は、螺旋状羽根110との間の地盤10に圧縮力を生じさせる。地盤10に圧縮力が導入されることによって、地盤10の剪断抵抗を向上させることができる。   The bearing plate 120 is an example of a bearing unit, and is a plate-like member, for example, and is provided mainly on the upper portion of the pile body 101. In addition, the bearing part of this invention is not limited to the plate-shaped bearing plate 120, A block-shaped member may be sufficient. When the pile main body 101 rotates and penetrates into the ground 10 and reaches the installation position, the bearing plate 120 is disposed in contact with the ground surface or in the ground. The bearing plate 120 generates a compressive force on the ground 10 between the spiral blades 110. By introducing a compressive force into the ground 10, the shear resistance of the ground 10 can be improved.

地すべり防止杭100は、図2に示すように、地盤10内へ垂直方向に打設されてもよいし、地盤10の法面に対して鉛直方向等の地盤10内へ斜め方向に打設されてもよい。図2は、本実施形態に係る地すべり防止杭100を示す側面図である。また、図2には示していないが、地すべり防止杭100は、地盤10内へ水平方向に打設されてもよい。   As shown in FIG. 2, the landslide prevention pile 100 may be driven vertically into the ground 10, or may be driven obliquely into the ground 10 such as a vertical direction with respect to the slope of the ground 10. May be. FIG. 2 is a side view showing the landslide prevention pile 100 according to the present embodiment. Although not shown in FIG. 2, the landslide prevention pile 100 may be placed in the ground 10 in the horizontal direction.

また、螺旋状羽根110は、図1に示すように、鋼板が先端鋼管102の鋼管部の周囲に約1周のみ螺旋状に設けられる場合に限定されない。例えば、図2の左側の地すべり防止杭100で示したように、鋼板が先端鋼管102の鋼管部の周囲に複数回螺旋状に設けられてもよい。   Further, as shown in FIG. 1, the spiral blade 110 is not limited to the case where the steel plate is spirally provided only about one turn around the steel pipe portion of the tip steel pipe 102. For example, as shown by the landslide prevention pile 100 on the left side of FIG. 2, the steel plate may be provided in a spiral shape around the steel pipe portion of the tip steel pipe 102 a plurality of times.

次に、本実施形態に係る地すべり防止杭100の施工方法について説明する。図3は、本実施形態に係る地すべり防止杭100の施工方法を示すフローチャートである。図4及び図5は、本実施形態に係る施工中の地すべり防止杭100を示す側面図である。   Next, the construction method of the landslide prevention pile 100 which concerns on this embodiment is demonstrated. FIG. 3 is a flowchart showing a construction method of the landslide prevention pile 100 according to the present embodiment. FIG.4 and FIG.5 is a side view which shows the landslide prevention pile 100 under construction which concerns on this embodiment.

まず、杭本体101が回転装置20等によって斜面などの地盤10に回転貫入される(ステップS11)。まず、図4に示すように、螺旋状羽根110が設けられた先端鋼管102が地盤10に貫入される。そして、先端鋼管102が所定の深さに到達したら、先端鋼管102に鋼管104が溶接などによって連結される。次に、図5に示すように、先端鋼管102と鋼管104が一体になった杭本体101が地盤10に貫入される。順次、鋼管104を連結していくことで、杭本体101を地盤10内のすべり面12より深く打設する。   First, the pile main body 101 is rotated and inserted into the ground 10 such as a slope by the rotating device 20 or the like (step S11). First, as shown in FIG. 4, the tip steel pipe 102 provided with the spiral blade 110 is penetrated into the ground 10. When the tip steel pipe 102 reaches a predetermined depth, the steel pipe 104 is connected to the tip steel pipe 102 by welding or the like. Next, as shown in FIG. 5, the pile body 101 in which the tip steel pipe 102 and the steel pipe 104 are integrated is penetrated into the ground 10. The pile main body 101 is driven deeper than the sliding surface 12 in the ground 10 by sequentially connecting the steel pipes 104.

ここで、回転装置20は、先端鋼管102又は鋼管104を把持し、先端鋼管102、鋼管104を、管軸を中心として回転させる。回転装置20は、図3に示すように、地盤面に設置される。回転装置20は、先端鋼管102及び鋼管104を回転させることによって、先端鋼管102及び鋼管104を地盤10内に貫入させる。   Here, the rotating device 20 grips the tip steel pipe 102 or the steel pipe 104 and rotates the tip steel pipe 102 and the steel pipe 104 around the pipe axis. As shown in FIG. 3, the rotating device 20 is installed on the ground surface. The rotating device 20 causes the tip steel pipe 102 and the steel pipe 104 to penetrate into the ground 10 by rotating the tip steel pipe 102 and the steel pipe 104.

なお、本実施形態では、杭本体101が先端鋼管102と複数の鋼管104からなる場合について説明したが、本発明はこの例に限定されない。例えば、杭本体101は、複数の鋼管を接続して構成されるのではなく、1本の鋼管から構成されてもよい。このときは、溶接などの連結作業をすることなく、地盤10内に杭本体101を貫入できる。   In addition, although this embodiment demonstrated the case where the pile main body 101 consists of the front-end | tip steel pipe 102 and the some steel pipe 104, this invention is not limited to this example. For example, the pile main body 101 may not be configured by connecting a plurality of steel pipes, but may be configured by a single steel pipe. At this time, the pile main body 101 can be penetrated into the ground 10 without performing a connecting operation such as welding.

杭本体101が設置深さに到達した場合(ステップS12)、螺旋状羽根110と支圧板120との間の地盤10に圧縮力が導入される(ステップS13)。   When the pile main body 101 reaches the installation depth (step S12), a compressive force is introduced into the ground 10 between the spiral blade 110 and the bearing plate 120 (step S13).

地盤10内への圧縮力の導入は、次の2通りがある。
一つの方法は、杭本体101を設置深さまで打設し終えた後、ジャッキ装置を杭本体101付近に設置する。そして、ジャッキ装置が杭本体101を反力にとって、支圧板120を地盤面に押圧する。このとき、ジャッキ装置の値によって、螺旋状羽根110と支圧板120との間の地盤10に導入する圧縮力を管理できる。その後、支圧板120を杭本体101に溶接などによって固定して、地盤10内への圧縮力の導入を完了する。
There are two ways of introducing the compressive force into the ground 10 as follows.
One method installs the jack apparatus near the pile body 101 after the pile body 101 has been driven to the installation depth. Then, the jack device presses the bearing plate 120 against the ground surface using the pile body 101 as a reaction force. At this time, the compressive force introduced into the ground 10 between the spiral blade 110 and the bearing plate 120 can be managed by the value of the jack device. Thereafter, the bearing plate 120 is fixed to the pile body 101 by welding or the like, and the introduction of the compressive force into the ground 10 is completed.

別の方法は、杭本体101の回転貫入の最終段階で、支圧板120を杭本体101に溶接などによって固定する。そして、螺旋状羽根110の推進力を利用して、回転装置20が地すべり防止杭100全体を地盤10内に回転貫入する。その結果、支圧板120によって、螺旋状羽根110と支圧板120との間の地盤10に圧縮力を導入できる。このとき、回転装置20の回転トルクの大きさで地盤10に導入する圧縮力を管理できる。所定の圧縮力導入が確認された後、地盤10内への圧縮力の導入を完了する。   In another method, the bearing plate 120 is fixed to the pile body 101 by welding or the like at the final stage of the rotary penetration of the pile body 101. Then, using the propulsive force of the spiral blade 110, the rotating device 20 rotates and penetrates the entire landslide prevention pile 100 into the ground 10. As a result, compressive force can be introduced into the ground 10 between the spiral blade 110 and the support plate 120 by the support plate 120. At this time, the compressive force introduced into the ground 10 can be managed by the magnitude of the rotational torque of the rotating device 20. After the introduction of the predetermined compressive force is confirmed, the introduction of the compressive force into the ground 10 is completed.

以上、本実施形態によれば、地すべり防止杭100を回転貫入することによって、地盤10が杭本体101周囲に圧密され、杭本体101周辺の地盤10の密度が上がる。これによって、地すべり防止杭100の水平地盤反力が大きくなり、杭本体101自身の負担剪断耐力を増大させる。その結果、地すべり防止杭100を打設することによって、盛土斜面又は切土斜面の地盤10及び土留めされた地盤10等を安定化させることができる。   As mentioned above, according to this embodiment, by rotating and penetrating the landslide prevention pile 100, the ground 10 is consolidated around the pile main body 101, and the density of the ground 10 around the pile main body 101 increases. As a result, the horizontal ground reaction force of the landslide prevention pile 100 is increased, and the load shear resistance of the pile body 101 itself is increased. As a result, by placing the landslide prevention pile 100, it is possible to stabilize the ground 10 of the embankment slope or the cut slope, the ground 10 that has been earthed, and the like.

図11に示すような従来例では、杭50の周囲に掘削穴18を設けて、杭50の打設後に掘削穴18を埋め戻している。そのため、地盤10の荷重バランスが悪くなったり、地下水の影響で地盤10の剪断抵抗が弱くなったりしやすいという問題がある。一方、本実施形態は、地盤10が杭本体101周囲に圧密され、杭本体101周辺の地盤10の密度が上がるため、従来例のような問題が生じにくい。また、本実施形態は掘削穴18がなく、土の埋め戻しが不要であるため、工期を短縮できる。   In the conventional example as shown in FIG. 11, the excavation hole 18 is provided around the pile 50, and the excavation hole 18 is backfilled after the pile 50 is placed. Therefore, there is a problem that the load balance of the ground 10 is deteriorated or the shear resistance of the ground 10 is easily weakened due to the influence of groundwater. On the other hand, in this embodiment, since the ground 10 is consolidated around the pile body 101 and the density of the ground 10 around the pile body 101 is increased, the problem as in the conventional example hardly occurs. Moreover, since this embodiment does not have the excavation hole 18 and does not need to backfill the soil, the construction period can be shortened.

また、地すべり防止杭100は、螺旋状羽根110による軸方向の抵抗力と、杭本体101の鋼管による軸直角方向の抵抗力を有する。更に、螺旋状羽根110による大きな推進力及び杭本体101の引き抜き抵抗を有するため、螺旋状羽根110と支圧板120によって地盤10に圧縮力を導入できる。その結果、地盤の拘束圧が増大し、地盤10の剪断抵抗(すべり抵抗)を増大させる。その結果、地すべり防止杭100を打設することによって、盛土斜面又は切土斜面の地盤10及び土留めされた地盤10等を安定化させることができる。   The landslide prevention pile 100 has an axial resistance force by the spiral blade 110 and an axial perpendicular resistance force by the steel pipe of the pile body 101. Furthermore, since it has a large driving force by the spiral blade 110 and a pull-out resistance of the pile body 101, a compressive force can be introduced into the ground 10 by the spiral blade 110 and the bearing plate 120. As a result, the restraining pressure of the ground increases and the shear resistance (slip resistance) of the ground 10 increases. As a result, by placing the landslide prevention pile 100, it is possible to stabilize the ground 10 of the embankment slope or the cut slope, the ground 10 that has been earthed, and the like.

更に、本実施形態は、図12に示すような従来例と異なり乾式工法であり、グラウト62を使用しない。そのため、土壌や地下水の汚染が発生する可能性が少なく、グラウト62の硬化にかかる時間が不要であるため工期を短縮できる。   Furthermore, this embodiment is a dry construction method unlike the conventional example as shown in FIG. 12, and the grout 62 is not used. Therefore, there is little possibility of soil and groundwater contamination, and the time required for hardening the grout 62 is unnecessary, so the construction period can be shortened.

(第2の実施形態)
次に、本発明の第2の実施形態に係る地すべり防止杭100について説明する。
本実施形態に係る地すべり防止杭100は、図8及び図9に示すように、第1の実施形態で説明した地すべり防止杭100の構成に加えて、周面に貫通した複数の貫通孔130が設けられた孔空き回転杭である。図8は、本実施形態に係る長軸方向に沿って切断した砂32が充填されたさや管200及び側面から見た地すべり防止杭100を示す説明図である。図9は、本実施形態に係るさや管200及び地すべり防止杭100を示す側面図である。
(Second Embodiment)
Next, the landslide prevention pile 100 according to the second embodiment of the present invention will be described.
As shown in FIGS. 8 and 9, the landslide prevention pile 100 according to the present embodiment includes a plurality of through holes 130 penetrating the circumferential surface in addition to the configuration of the landslide prevention pile 100 described in the first embodiment. It is a perforated rotary pile provided. FIG. 8 is an explanatory diagram showing the sheath pipe 200 filled with sand 32 cut along the long axis direction according to the present embodiment and the landslide prevention pile 100 viewed from the side. FIG. 9 is a side view showing the sheath tube 200 and the landslide prevention pile 100 according to the present embodiment.

本実施形態の地すべり防止杭100が地盤10内に埋設されることによって、地盤10内の水を排水でき、移動層(崩壊部)の自重を減少させて、地盤10の剪断耐力を向上させる。   By embedding the landslide prevention pile 100 of this embodiment in the ground 10, the water in the ground 10 can be drained, the dead weight of a moving layer (collapse part) is reduced, and the shear strength of the ground 10 is improved.

地すべり防止杭100の杭本体101は、中空の鋼管又は砂が充填された鋼管である。貫通孔130は、杭本体101の内部と外部が貫通するように杭本体101の周面に形成された開口部である。貫通孔130は、杭本体101の周面に複数設けられる。   The pile body 101 of the landslide prevention pile 100 is a hollow steel pipe or a steel pipe filled with sand. The through hole 130 is an opening formed on the peripheral surface of the pile body 101 so that the inside and the outside of the pile body 101 penetrate. A plurality of through holes 130 are provided on the peripheral surface of the pile body 101.

杭本体101の内部には、杭本体101の先端の開口を閉鎖する板部材140が設置されるか又は砂(図示せず。)が充填される。板部材140又は内部に充填された砂は、地すべり防止杭100が地盤10内に回転貫入される際に、杭本体101内部に土が充填されることを防止できる。その結果、板部材140の設置位置や砂の充填位置を調整することで、貫通孔130が設けられた部分まで杭本体101の内部に土が充填されることがなくなる。   A plate member 140 that closes the opening at the tip of the pile body 101 is installed inside the pile body 101 or is filled with sand (not shown). The sand filled in the plate member 140 or the inside can prevent the pile main body 101 from being filled with soil when the landslide prevention pile 100 is rotated and penetrated into the ground 10. As a result, by adjusting the installation position of the plate member 140 and the sand filling position, the pile main body 101 is not filled with soil up to the portion where the through hole 130 is provided.

なお、本発明では、板部材140を杭本体101の先端に設置してもよい。但し、杭本体101の先端ではなく、貫通孔130に影響を及ぼさない杭本体101の内部に板部材140を設置することで、回転貫入によって、杭本体101内部にある程度土を入り込ませることができる。その結果、板部材140が杭本体101の先端に設置される場合に比べて、杭本体101の貫入性が良くなる。   In the present invention, the plate member 140 may be installed at the tip of the pile body 101. However, by installing the plate member 140 inside the pile main body 101 that does not affect the through-hole 130 instead of the tip of the pile main body 101, soil can enter the pile main body 101 to some extent by rotation penetration. . As a result, the penetration of the pile body 101 is improved as compared with the case where the plate member 140 is installed at the tip of the pile body 101.

地すべり防止杭100は、地盤10内に水平方向に設置される。又は、地すべり防止杭100の地盤10内よりも地盤面側が低くなるように斜め方向に設置される。これにより、杭本体101内部の水を重力で外部に排出できる。なお、地すべり防止杭100の地盤10内よりも地盤面側が高くなるように斜め方向に設置されてもよい。この場合、杭本体101内部の水を排水するため、ポンプを設置し、吸引してもよい。   The landslide prevention pile 100 is installed in the ground 10 in the horizontal direction. Or it installs in the diagonal direction so that the ground surface side may become lower than the ground 10 side of the landslide prevention pile 100. Thereby, the water inside the pile main body 101 can be discharged outside by gravity. In addition, you may install in the diagonal direction so that a ground surface side may become higher than the inside of the ground 10 of the landslide prevention pile 100. FIG. In this case, in order to drain the water inside the pile body 101, a pump may be installed and sucked.

次に、本実施形態に係る地すべり防止杭100の施工方法について説明する。図6は、本実施形態に係る地すべり防止杭100の施工方法を示すフローチャートである。図7は、本実施形態に係る砂32が充填されたさや管200を示す側面図である。   Next, the construction method of the landslide prevention pile 100 which concerns on this embodiment is demonstrated. FIG. 6 is a flowchart showing a construction method of the landslide prevention pile 100 according to the present embodiment. FIG. 7 is a side view showing the sheath 200 filled with the sand 32 according to the present embodiment.

まず、図7に示すように、内部に砂32が充填されたさや管200が地盤10内に回転貫入される(ステップS21)。さや管200の周面には螺旋状羽根210が設けられ、回転装置がさや管200を地盤10内に回転貫入できる。さや管200の先端部には、さや管200の回転貫入時に地盤10がさや管200内部に入り込まないように、薄鉄板(図示せず。)などによって閉鎖することもある。   First, as shown in FIG. 7, the sheath 200 filled with sand 32 is rotationally inserted into the ground 10 (step S <b> 21). A spiral blade 210 is provided on the peripheral surface of the sheath 200, and the rotating device can rotate the sheath 200 into the ground 10. The tip of the sheath tube 200 may be closed with a thin iron plate (not shown) or the like so that the ground 10 does not enter the sheath tube 200 when the sheath tube 200 rotates and penetrates.

次に、図8に示すように、砂32が充填されたさや管200内部に、地すべり防止杭100(孔空き回転杭)が回転貫入される(ステップS22)。地すべり防止杭100の螺旋状羽根110の外径は、さや管200の内径よりも小さい。地すべり防止杭100は、さや管200の先端部に設けられた薄鉄板を貫通して、設置深さまで回転貫入される。   Next, as shown in FIG. 8, the landslide prevention pile 100 (perforated rotary pile) is rotationally inserted into the sheath 200 filled with sand 32 (step S22). The outer diameter of the spiral blade 110 of the landslide prevention pile 100 is smaller than the inner diameter of the sheath tube 200. The landslide prevention pile 100 penetrates through a thin iron plate provided at the tip of the sheath tube 200 and is rotated and penetrated to the installation depth.

地すべり防止杭100が設置深さまで設置された後、図9に示すように、回転装置がさや管200を逆回転することによって、さや管200を地盤10内から撤去する(ステップS23)。このとき、さや管200内部に充填されていた砂32は地盤10内に残留するようにする。この結果、図9に示すように、地盤10内に打設された地すべり防止杭100の周囲に、砂32が配置された状態になる。   After the landslide prevention pile 100 is installed to the installation depth, as shown in FIG. 9, the rotating device reversely rotates the sheath tube 200, thereby removing the sheath tube 200 from the ground 10 (step S23). At this time, the sand 32 filled in the sheath 200 is allowed to remain in the ground 10. As a result, as shown in FIG. 9, the sand 32 is disposed around the landslide prevention pile 100 driven in the ground 10.

地すべり防止杭100が、粘土質の土が含まれる地盤10に直接貫入される場合に比べて、砂32に貫入されることによって、貫通孔130は目詰まりすることがない。従って、貫通孔130は、地すべり防止杭100が打設されたのち、地盤10内の水を地すべり防止杭100内部に効率良く導くことができる。   The through-hole 130 is not clogged by being penetrated into the sand 32 as compared with the case where the landslide prevention pile 100 is directly penetrated into the ground 10 containing clayey soil. Therefore, the through hole 130 can efficiently guide the water in the ground 10 into the landslide prevention pile 100 after the landslide prevention pile 100 is placed.

そして、第1の実施形態と同様に地盤面に接触するように支圧板120が設置され、螺旋状羽根110と支圧板120の間に圧縮力が導入される。   Then, as in the first embodiment, the pressure plate 120 is installed so as to be in contact with the ground surface, and a compressive force is introduced between the spiral blade 110 and the pressure plate 120.

盛土斜面又は切土斜面の地盤10及び土留めされた地盤10等は、雨による含水率の増大による崩壊部の自重の増加や、図9に示すような地下水位16A,16Bの上昇による地盤10の有効応力の減少による剪断耐力の低下によって、崩壊が発生する。従って、地盤10内の地下水を排水することによって、地盤10の安定化を図ることができる。   The ground 10 of the embankment slope or the cut slope and the soil-ground ground 10 are increased by the weight of the collapsed portion due to an increase in moisture content due to rain, or by the rise of the groundwater levels 16A and 16B as shown in FIG. Collapse occurs due to a decrease in shear strength due to a decrease in effective stress. Therefore, the ground 10 can be stabilized by draining the ground water in the ground 10.

以上、本実施形態によれば、第1の実施形態と同様に、地すべり防止杭100は、螺旋状羽根110による大きな推進力及び杭本体101の引き抜き抵抗を有するため、螺旋状羽根110と支圧板120によって地盤10に圧縮力を導入できる。その結果、内部摩擦角φが増大し、地盤10の剪断抵抗(すべり抵抗)を増大させる。その結果、地すべり防止杭100を打設することによって、盛土斜面又は切土斜面の地盤10及び土留めされた地盤10等を安定化させることができる。   As described above, according to this embodiment, similarly to the first embodiment, the landslide prevention pile 100 has a large driving force by the spiral blade 110 and a pull-out resistance of the pile body 101, and thus the spiral blade 110 and the bearing plate. The compressive force can be introduced to the ground 10 by 120. As a result, the internal friction angle φ increases and the shear resistance (slip resistance) of the ground 10 increases. As a result, by placing the landslide prevention pile 100, it is possible to stabilize the ground 10 of the embankment slope or the cut slope, the ground 10 that has been earthed, and the like.

更に、本実施形態は、地盤10内の水を排水することによって、崩壊部の自重を減らし、地盤10の剪断耐力を向上させる。   Furthermore, this embodiment reduces the dead weight of a collapse part by draining the water in the ground 10, and improves the shear strength of the ground 10.

また、従来、新設の盛土では孔空き排水管(ドレーン管)を盛土の形成と共に容易に設置することができたが、切土や既設の盛土では孔空き排水管を設置しにくいという問題があった。そのため、水圧に耐えられるような擁壁が斜面に形成されていた。一方、本実施形態によれば、砂32が充填されたさや管200を用いることで、貫通孔130が設けられた地すべり防止杭100を目詰まりさせることなく地盤10内に容易に埋設できるうえ、水圧に耐えなければならない擁壁の形成が不要になる。   Conventionally, it has been easy to install a perforated drainage pipe (drain pipe) together with the formation of the embankment in a new embankment, but there is a problem that it is difficult to install a perforated drainage pipe in a cut or existing embankment. It was. Therefore, a retaining wall that can withstand water pressure was formed on the slope. On the other hand, according to this embodiment, by using the sheath 200 filled with the sand 32, the landslide prevention pile 100 provided with the through hole 130 can be easily embedded in the ground 10 without clogging. It is not necessary to form a retaining wall that must withstand water pressure.

なお、図7〜9では、擁壁14が斜面に形成されている。この擁壁14は、地すべり防止杭100を打設した後も、設置したままとしてもよいが、地すべり防止杭100が打設された後、地盤10の安定性が確認される場合は、擁壁14を撤去してもよい。擁壁14の設置及び撤去については、貫通孔130がない第1の実施形態に係る地すべり防止杭100の打設の場合も同様である。   In addition, in FIGS. 7-9, the retaining wall 14 is formed in the slope. The retaining wall 14 may be left installed after the landslide prevention pile 100 has been placed. However, when the stability of the ground 10 is confirmed after the landslide prevention pile 100 has been placed, 14 may be removed. The installation and removal of the retaining wall 14 is the same in the case of placing the landslide prevention pile 100 according to the first embodiment without the through hole 130.

また、上述した第2の実施形態では、目詰まりを防止するため、地すべり防止杭100が施工される前に、内部に砂21が充填されたさや管200が埋設される。そして、さや管200内に地すべり防止杭100が設置された後、さや管200が地盤10内から撤去される。一方、さや管200の設置を省略する方法によって、第2の実施形態に係る地すべり防止杭100を設置することもできる。   Moreover, in 2nd Embodiment mentioned above, in order to prevent clogging, before the landslide prevention pile 100 is constructed, the sheath 200 with which the sand 21 was filled is embed | buried. And after the landslide prevention pile 100 is installed in the sheath 200, the sheath 200 is removed from the ground 10. On the other hand, the landslide prevention pile 100 which concerns on 2nd Embodiment can also be installed by the method which abbreviate | omits installation of the sheath pipe | tube 200. FIG.

まず、周面に貫通孔130を有し、内部に砂が充填された地すべり防止杭100を地盤10内に回転貫入する。そして、回転貫入と同時に又は回転貫入の後で、地すべり防止杭100の内部に充填された砂に圧縮力を掛け、砂を貫通孔130から地すべり防止杭100の外部へ排出する。この施工方法によれば、地すべり防止杭100内部から砂が排出されることによって、地すべり防止杭100の周囲に砂を配置でき、貫通孔130の目詰まりも防止できる。   First, the landslide prevention pile 100 which has the through-hole 130 in the surrounding surface and was filled with sand is rotationally penetrated into the ground 10. Then, simultaneously with the rotation penetration or after the rotation penetration, a compressive force is applied to the sand filled in the landslide prevention pile 100, and the sand is discharged from the through hole 130 to the outside of the landslide prevention pile 100. According to this construction method, by discharging sand from the landslide prevention pile 100, the sand can be disposed around the landslide prevention pile 100, and clogging of the through hole 130 can be prevented.

地すべり防止杭100の内部に充填された砂に圧縮力を掛け、貫通孔130から砂を外部に排出するには、地盤面側の杭頭にコンプレッサーを取り付けて空気圧を作用させる方法がある。又は、地すべり防止杭100の内部に、地すべり防止杭100の内径より小さい杭を押しこむ方法がある。   In order to apply a compressive force to the sand filled in the landslide prevention pile 100 and discharge the sand to the outside from the through hole 130, there is a method in which a compressor is attached to the pile head on the ground surface side to apply air pressure. Alternatively, there is a method of pushing a pile smaller than the inner diameter of the landslide prevention pile 100 into the landslide prevention pile 100.

(第3の実施形態)
次に、図10を参照して、本発明の第3の実施形態に係る地すべり防止杭100について説明する。図10は、本実施形態に係るソーラーパネル40及び地すべり防止杭100を示す側面図である。
(Third embodiment)
Next, with reference to FIG. 10, the landslide prevention pile 100 which concerns on the 3rd Embodiment of this invention is demonstrated. FIG. 10 is a side view showing the solar panel 40 and the landslide prevention pile 100 according to the present embodiment.

第1の実施形態で説明したように、地すべり防止杭100を地盤10に打設した後、本実施形態では、杭本体101の地盤面側に位置する杭頭にソーラーパネル40等の設備機器が固定される。即ち、地すべり防止杭100は、杭本体101の引き抜き耐力を利用して、斜面に設置する設備の基礎にすることもできる。   As described in the first embodiment, after placing the landslide prevention pile 100 on the ground 10, in this embodiment, equipment such as the solar panel 40 is placed on the pile head located on the ground surface side of the pile body 101. Fixed. That is, the landslide prevention pile 100 can be used as a foundation of equipment installed on the slope using the pulling strength of the pile body 101.

また、ソーラーパネル40等の板状の設備機器は、風を受けた際にあおられるが、本実施形態は、地すべり防止杭100に螺旋状羽根110が設けられているため、引き抜きに強い。そして、斜面は、第1の実施形態と同様に安定化されているため、従来の基礎に比べて安定して設備機器を設置できる。   Moreover, although plate-shaped equipment, such as the solar panel 40, is covered when receiving wind, the present embodiment is resistant to pulling out because the landslide prevention pile 100 is provided with the spiral blades 110. And since the slope is stabilized similarly to 1st Embodiment, compared with the conventional foundation, it can install an installation apparatus stably.

なお、ソーラーパネル40を設置する場合、図10に示すように、複数の地すべり防止杭100の杭頭を使用してもよい。このとき、地すべり防止杭100の螺旋状羽根110は、引き抜き強度等を考慮して、図10に示すように、地すべり防止杭100毎に螺旋状羽根110の巻回数や形状が異なるものを打設してもよいし、図10と異なり、すべて同一の地すべり防止杭100を打設してもよい。   In addition, when installing the solar panel 40, you may use the pile head of the several landslide prevention pile 100, as shown in FIG. At this time, the spiral blade 110 of the landslide prevention pile 100 is placed with a different number of turns and shape of the spiral blade 110 for each landslide prevention pile 100 as shown in FIG. Alternatively, unlike FIG. 10, the same landslide prevention pile 100 may be placed.

以上、添付図面を参照しながら本発明の好適な実施形態について詳細に説明したが、本発明はかかる例に限定されない。本発明の属する技術の分野における通常の知識を有する者であれば、特許請求の範囲に記載された技術的思想の範疇内において、各種の変更例または修正例に想到し得ることは明らかであり、これらについても、当然に本発明の技術的範囲に属するものと了解される。   The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

10 地盤
12 すべり面
14 擁壁
16A,16B 地下水位
18 掘削穴
20 回転装置
32 砂
40 ソーラーパネル
50 杭
60 アースアンカー
62 グラウト
64 支圧板
100 地すべり防止杭
101 杭本体
102 先端鋼管
104 鋼管
110,210 螺旋状羽根
120 支圧板
130 貫通孔
140 板部材
200 さや管
DESCRIPTION OF SYMBOLS 10 Ground 12 Sliding surface 14 Retaining wall 16A, 16B Groundwater level 18 Drilling hole 20 Rotating device 32 Sand 40 Solar panel 50 Pile 60 Earth anchor 62 Grout 64 Bearing plate 100 Landslide prevention pile 101 Pile body 102 Tip steel pipe 104 Steel pipe 110,210 Spiral Blade 120 pressure bearing plate 130 through hole 140 plate member 200 sheath tube

Claims (9)

鋼管からなる杭本体と、
前記杭本体の先端又は周面に螺旋状に設けられた螺旋状羽根と、
前記杭本体の周面に設けられ、地盤面に接触して又は地中に配置されて前記螺旋状羽根との間の地盤に圧縮力を生じさせる支圧部と
を備える、地すべり防止杭。
A pile body made of steel pipe,
A spiral blade provided spirally on the tip or peripheral surface of the pile body;
A landslide prevention pile comprising: a supporting portion provided on a peripheral surface of the pile main body and arranged in contact with the ground surface or in the ground to generate a compressive force between the spiral blades and the ground.
前記杭本体は、周面に複数の貫通孔が設けられ、
前記貫通孔は、地盤からの水を前記杭本体内部に通過させ、
前記杭本体は、前記杭本体内部から地盤外部に前記水を排出する、請求項1に記載の地すべり防止杭。
The pile body is provided with a plurality of through holes on the peripheral surface,
The through hole allows water from the ground to pass inside the pile body,
The landslide prevention pile according to claim 1, wherein the pile body discharges the water from the inside of the pile body to the outside of the ground.
前記杭本体の先端が開口され、
前記杭本体は、前記杭本体の先端を閉鎖するように前記杭本体内部に板部材が設けられるか又は杭本体内部に砂が詰められ、
前記杭本体は、前記板部材より地盤面側で地盤からの水を前記杭本体内部から地盤外部に前記水を排出する、請求項2に記載の地すべり防止杭。
The tip of the pile body is opened,
The pile body is provided with a plate member inside the pile body so as to close the tip of the pile body or sand is filled inside the pile body,
The landslide prevention pile according to claim 2, wherein the pile body discharges water from the ground from the inside of the pile body to the outside of the ground on the ground surface side from the plate member.
前記杭本体の地盤面側に位置する杭頭に設備機器が固定される、請求項1〜3のいずれか1項に記載の地すべり防止杭。   The landslide prevention pile according to any one of claims 1 to 3, wherein facility equipment is fixed to a pile head located on a ground surface side of the pile body. 請求項1〜4のいずれか1項に記載の地すべり防止杭を用いて、前記杭本体の軸方向の抵抗力と軸直角方向の抵抗力によって、地盤のすべりに対する抵抗力を向上させる、地すべり防止方法。   The landslide prevention pile which uses the landslide prevention pile of any one of Claims 1-4, and improves the resistance with respect to the slip of a ground by the resistance force of the axial direction of the said pile main body, and the resistance force of an axis perpendicular direction. Method. 請求項1〜4のいずれか1項に記載の地すべり防止杭を用いて、前記杭本体が地盤内に回転貫入されたときに前記杭本体が発揮する引き抜き耐力と、前記杭本体の貫入と同時に配置される又は前記杭本体の貫入の後から設置される前記支圧部を介して、地盤に前記圧縮力を生じさせる、地すべり防止方法。   With the use of the landslide prevention pile according to any one of claims 1 to 4, when the pile main body is rotated and penetrated into the ground, the pulling-out strength exerted by the pile main body and the penetration of the pile main body simultaneously A landslide prevention method in which the compressive force is generated in the ground via the bearing portion that is arranged or installed after the penetration of the pile body. 請求項1〜4のいずれか1項に記載の地すべり防止杭を用いて、前記杭本体が地盤内に回転圧入されたときに前記螺旋状羽根の貫入によって生じる地盤反力により、地盤に前記圧縮力を生じさせる、地すべり防止方法。   The landslide prevention pile according to any one of claims 1 to 4, wherein when the pile main body is rotationally pressed into the ground, the ground reaction force generated by the penetration of the spiral blades causes the compression to the ground. Landslide prevention method that generates power. 砂が内部に充填された鋼管からなる管本体と、前記管本体の周面に螺旋状に設けられた第一の螺旋状羽根とを有する管を地盤内に回転貫入するステップと、
周面に複数の貫通孔が設けられ、中空の鋼管又は砂が充填された鋼管からなる杭本体と、前記杭本体の周面に螺旋状に設けられた第二の螺旋状羽根とを有する地すべり防止杭を前記管内部に回転貫入するステップと、
前記砂を地盤に残して前記管を地盤から回転しながら撤去するステップと、
前記杭本体の上部に設けられる支圧部を地盤面に接触又は地中に配置させるステップと、
前記第二の螺旋状羽根と前記支圧部との間の地盤に圧縮力を生じさせるステップと
を含む、地すべり防止杭の施工方法。
A step of rotating and penetrating a pipe having a pipe main body made of a steel pipe filled with sand and a first spiral blade spirally provided on a peripheral surface of the pipe main body into the ground;
A landslide having a pile main body made of a steel pipe filled with a plurality of through-holes on the peripheral surface and filled with a hollow steel pipe or sand, and a second spiral blade spirally provided on the peripheral surface of the pile main body Rotationally penetrating a prevention pile inside the tube;
Leaving the sand on the ground and removing the pipe while rotating from the ground;
A step of placing a bearing portion provided on an upper portion of the pile body in contact with the ground surface or in the ground;
The construction method of a landslide prevention pile including the step which produces a compressive force in the ground between said 2nd spiral blade | wing and the said bearing part.
周面に貫通した複数の貫通孔が設けられ、砂が内部に充填された鋼管からなら杭本体と、前記杭本体の周面に螺旋状に設けられた螺旋状羽根とを有する地すべり防止杭を地盤内に回転貫入するステップと、
回転貫入と同時に又は回転貫入の後で、前記鋼管の内部に充填された前記砂に圧縮力を掛け、前記砂を前記鋼管の前記貫通孔から前記鋼管の外部へ排出するステップと、
前記杭本体の上部に設けられる支圧部を地盤面に接触又は地中に配置させるステップと、
前記螺旋状羽根と前記支圧部との間の地盤に圧縮力を生じさせるステップと
を含む、地すべり防止杭の施工方法。
A landslide prevention pile having a pile body provided with a plurality of through holes penetrating the circumferential surface and filled with sand and a spiral blade provided spirally on the circumferential surface of the pile body. A step of rotating and penetrating into the ground,
Simultaneously with or after rotational penetration, applying a compressive force to the sand filled in the steel pipe, and discharging the sand from the through hole of the steel pipe to the outside of the steel pipe;
A step of placing a bearing portion provided on an upper portion of the pile body in contact with the ground surface or in the ground;
The construction method of a landslide prevention pile including the step which produces a compressive force in the ground between the said helical blade | wing and the said bearing part.
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