JP4903620B2 - Excavation device for pile construction and pile construction method - Google Patents

Excavation device for pile construction and pile construction method Download PDF

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JP4903620B2
JP4903620B2 JP2007100268A JP2007100268A JP4903620B2 JP 4903620 B2 JP4903620 B2 JP 4903620B2 JP 2007100268 A JP2007100268 A JP 2007100268A JP 2007100268 A JP2007100268 A JP 2007100268A JP 4903620 B2 JP4903620 B2 JP 4903620B2
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吉郎 石濱
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Nippon Steel Corp
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Description

本発明は、杭施工用掘削装置および杭の施工方法に関し、詳しくは、杭の施工に際して地盤を掘削する杭施工用掘削装置、この杭施工用掘削装置を用いて掘削した地盤に杭を構築する杭の施工方法に関する。   TECHNICAL FIELD The present invention relates to a pile construction excavation apparatus and a pile construction method, and more particularly, to construct a pile on a ground excavated using the pile construction excavation apparatus for excavating the ground during the construction of the pile. It relates to the construction method of piles.

従来、杭施工用掘削装置としては、先端に掘削刃を有するケーシングを回転させながら地盤に圧入して掘削し、ケーシング内に挿入したハンマグラブ等の掘削排土機を用いて排土するとともに、ケーシングの先端が中間層や支持層、岩盤等の硬質地盤部に達した際にハンマグラブ等を抜き、小径回転掘削ケーシングを上端からケーシング内部に挿入し、内外ケーシングの刃先を整えながら硬質地盤部をコア状に掘削する掘削装置が知られている(例えば、特許文献1参照)。
また、特許文献1の小径回転掘削ケーシングと同様の小径ケーシングチューブと、この小径ケーシングチューブに着脱可能に連結されるとともにケーシング内で拡開してケーシング内周に係合するグリップ機構とを備え、グリップ機構から小径ケーシングチューブを取り外すことで、小径ケーシングチューブ内に取込んだ掘削土の取出しが容易にできる掘削装置も提案されている(例えば、特許文献2参照)。
Conventionally, as a drilling device for pile construction, while rotating a casing having a drilling blade at the tip, it is pressed into the ground and excavated, and excavated using a excavator such as a hammaglab inserted into the casing, and the casing When the tip of the arm reaches the hard ground such as the intermediate layer, support layer, and rock, remove the hammer maglab, etc., insert the small-diameter rotary drilling casing into the casing from the top, and core the hard ground while adjusting the cutting edges of the inner and outer casings. 2. Description of the Related Art A drilling device that drills into a shape is known (for example, see Patent Document 1).
Further, a small-diameter casing tube similar to the small-diameter rotary excavation casing of Patent Document 1, and a grip mechanism that is detachably connected to the small-diameter casing tube and that expands in the casing and engages the inner periphery of the casing, There has also been proposed a drilling device that can easily remove excavated soil taken into the small diameter casing tube by removing the small diameter casing tube from the grip mechanism (see, for example, Patent Document 2).

特開昭61−24723号公報Japanese Patent Laid-Open No. 61-24723 特開2001−214682号公報JP 2001-214682 A

しかしながら、前記特許文献1に記載の従来の掘削装置では、硬質地盤部まではハンマグラブ等を用いて排土しながらケーシングで掘削するものの、硬質地盤部では小径ケーシングを用いて削孔作業に移るため、作業が2段階となり施工手間が大きくなってしまうという問題がある。さらに、硬質地盤部をコア状に掘削するため小径回転掘削ケーシング内に掘削土を取込むたびに、ケーシングから小径回転掘削ケーシングを引抜き、地上においてバイプレータ一等で振動をかけるなどして小径回転掘削ケーシングの掘削土を取り出す必要があるため、連続的に掘削作業を実施することができず作業時間が長期化してしまうという問題もある。
一方、前記特許文献2に記載の従来の掘削装置でも、小径ケーシングチューブ内に掘削土を取込むたびにケーシングから小径ケーシングチューブを引抜き、地上において掘削土を取り除く作業が必要であり、特許文献1の掘削装置と同様に、掘削作業時間が長期化してしまうという問題がある。
However, in the conventional excavation device described in Patent Document 1, although the hard ground portion is excavated with a casing while soiling using a hammaglab or the like, the hard ground portion is moved to a drilling operation using a small-diameter casing. There is a problem that the work becomes two stages and the construction labor is increased. Furthermore, each time the excavated soil is taken into the small-diameter rotary excavation casing to excavate the hard ground into a core shape, the small-diameter rotary excavation casing is pulled out of the casing and vibrated with a vibrator etc. on the ground. Since it is necessary to take out the excavated soil from the casing, there is also a problem that the excavation work cannot be carried out continuously and the work time is prolonged.
On the other hand, even in the conventional excavator described in Patent Document 2, every time the excavated soil is taken into the small diameter casing tube, it is necessary to pull out the small diameter casing tube from the casing and remove the excavated soil on the ground. As with other excavator, there is a problem that the excavation work time is prolonged.

本発明の目的は、掘削土を連続的に排土することで掘削作業を効率的に実施し施工時間を短縮することができる杭施工用掘削装置および杭の施工方法を提供することにある。   The objective of this invention is providing the excavation apparatus for pile construction which can implement excavation work efficiently by excavating excavated soil continuously, and can shorten construction time, and the construction method of a pile.

本発明の請求項1に記載の杭施工用掘削装置は、杭の施工に際して地盤を掘削する杭施工用掘削装置であって、先端に掘削用ビットを有して回転駆動される外側管と、この外側管の内部に設けられかつ先端に掘削用ビットを有して回転駆動される内側管と、前記外側管の内部かつ前記内側管の上方に設けられて掘削土を地上に排出する排出手段とを備えて構成され、前記内側管は、当該内側管の内部の土を粉砕する内部粉砕手段を有して構成されていることを特徴とする。   The excavation apparatus for pile construction according to claim 1 of the present invention is an excavation apparatus for pile construction that excavates the ground during the construction of the pile, and has an outer pipe that is rotationally driven with an excavation bit at the tip, An inner pipe which is provided inside the outer pipe and has a drilling bit at the tip and is driven to rotate, and a discharge means which is provided inside the outer pipe and above the inner pipe and discharges excavated soil to the ground. The inner tube has an internal crushing means for crushing the soil inside the inner tube.

以上の杭施工用掘削装置によれば、外側管および内側管で掘削した掘削土を地上に排出する排出手段を備えたことで、外側管および内側管による掘削を連続的に実施でき、従来の掘削装置のように地上において内側管内の掘削土を取り出す必要がなく、掘削作業を効率的に実施し施工時間を短縮することができる。さらに、内側管の内部の土を粉砕する内部粉砕手段を備えたことで、内側管に取り込まれたコア状の土塊を細かくして排出手段による排土が容易になり、さらに掘削作業を高速化することができる。
また、各々の先端に掘削ビットを備えた外側管および内側管からなる二重管で掘削することで、硬質地盤部であっても比較的低トルクで掘削することができ、掘削装置の大型化や製造コストの増大を防止することができる。
According to the above excavation apparatus for pile construction, by providing the discharge means for discharging the excavated soil excavated by the outer pipe and the inner pipe to the ground, the excavation by the outer pipe and the inner pipe can be continuously performed. Unlike the excavator, there is no need to take out the excavated soil in the inner pipe on the ground, and excavation work can be performed efficiently and the construction time can be shortened. In addition, by providing an internal crushing means for crushing the soil inside the inner pipe, the core-shaped soil mass taken into the inner pipe can be made finer and discharged by the discharging means, and the excavation work can be sped up further. can do.
In addition, by excavating with a double pipe consisting of an outer pipe and an inner pipe each provided with a drill bit at each end, it is possible to drill with relatively low torque even on a hard ground part, and increase the size of the drilling device And an increase in manufacturing cost can be prevented.

この際、本発明の杭施工用掘削装置では、前記内部粉砕手段は、前記内側管の内周面に設けられた少なくとも1つのビットを有して構成されていることが好ましい。
さらに、本発明の杭施工用掘削装置では、前記内側管の内周面のビットは、当該内周面において周方向に複数並べられた少なくとも一段のビット列、または前記内周面において螺旋状に複数並べられた螺旋ビット列のいずれかの列状に構成されていることが好ましい。
このような構成によれば、内側管の内周面に設けたビットによって、内側管に取り込まれたコア状の土塊を粉砕することができるとともに、ビットを周方向に複数並べたり、螺旋状に複数並べたりすることで、粉砕性能を高めて排出手段による排土効率を向上させることができる。
At this time, in the excavation apparatus for pile construction according to the present invention, it is preferable that the internal pulverizing means has at least one bit provided on the inner peripheral surface of the inner pipe.
Furthermore, in the excavation apparatus for pile construction according to the present invention, the inner peripheral surface of the inner pipe includes a plurality of bits arranged in the circumferential direction on the inner peripheral surface, or a plurality of bits arranged in a spiral on the inner peripheral surface. It is preferable to be configured in any one of the arranged spiral bit strings.
According to such a configuration, the core provided in the inner tube can be crushed by the bit provided on the inner peripheral surface of the inner tube, and a plurality of bits can be arranged in the circumferential direction or spirally formed. By arranging a plurality, it is possible to improve the crushing performance and improve the soil removal efficiency by the discharging means.

また、本発明の杭施工用掘削装置では、前記内側管は、当該内側管の上部に連結されて当該内側管を回転支持する連結部と、この連結部に設けられた連結部粉砕手段とを有して構成されていることが好ましい。
このような構成によれば、内側管の上部に連結された連結部(例えば、内側管を回転駆動する駆動部から延びるロッドと内側管との連結支持部等)に連結部粉砕手段を設けることで、内側管の内部を上昇する土塊を排出手段の近傍で確実に粉砕することができ、排土効率を向上させることができる。
Moreover, in the excavation apparatus for pile construction of the present invention, the inner pipe is connected to an upper portion of the inner pipe and rotationally supports the inner pipe, and a connecting portion crushing means provided in the connecting portion. It is preferable to have it.
According to such a configuration, the connecting portion crushing means is provided in the connecting portion connected to the upper portion of the inner tube (for example, the connecting support portion between the rod and the inner tube extending from the drive unit that rotationally drives the inner tube). Thus, the lump rising inside the inner pipe can be reliably pulverized in the vicinity of the discharging means, and the soil discharging efficiency can be improved.

また、本発明の杭施工用掘削装置では、前記内側管は、当該内側管と前記外側管との間の土を粉砕する外部粉砕手段を有して構成され、前記外部粉砕手段は、前記内側管の外周面に設けられた少なくとも1つのビットを有して構成されていることが好ましい。
さらに、本発明の杭施工用掘削装置では、前記内側管の外周面のビットは、当該外周面において周方向に複数並べられた少なくとも一段のビット列、または前記外周面において螺旋状に複数並べられた螺旋ビット列のいずれかの列状に構成されていることが好ましい。
このような構成によれば、内側管の外周面に設けたビットで外部粉砕手段を構成し、この外部粉砕手段で内側管と外側管との間に入った土塊を粉砕することで、さらに掘削能力および排土効率を高めることができ、掘削作業を高速化することができる。
In the excavation apparatus for pile construction according to the present invention, the inner pipe includes an external crushing means for crushing soil between the inner pipe and the outer pipe, and the outer crushing means It is preferable to have at least one bit provided on the outer peripheral surface of the tube.
Furthermore, in the excavation apparatus for pile construction according to the present invention, a plurality of bits on the outer peripheral surface of the inner pipe are arranged in a plurality of rows in at least one bit line arranged in the circumferential direction on the outer peripheral surface, or in a spiral form on the outer peripheral surface. It is preferably configured in the form of any one of the spiral bit strings.
According to such a configuration, the bit provided on the outer peripheral surface of the inner pipe constitutes the external crushing means, and the outer crushing means crushes the earth lump that has entered between the inner pipe and the outer pipe, thereby further excavating. Capacity and soil removal efficiency can be increased, and excavation work can be speeded up.

また、本発明の杭施工用掘削装置では、前記外側管の内周面には、前記内側管との間の土を粉砕する少なくとも1つのビットが設けられ、前記外側管の内周面のビットは、当該内周面において周方向に複数並べられた少なくとも一段のビット列、または前記内周面において螺旋状に複数並べられた螺旋ビット列のいずれかの列状に構成されていることが好ましい。
このような構成によれば、外側管の内周面に設けたビットで内側管と外側管との間に入った土塊を粉砕することで、掘削能力および排土効率をより一層向上させることができる。
Moreover, in the excavation apparatus for pile construction according to the present invention, at least one bit for pulverizing soil between the inner pipe and the inner pipe of the outer pipe is provided on the inner pipe of the outer pipe. Is preferably configured in the form of one of a plurality of bit strings arranged in the circumferential direction on the inner circumferential surface or a spiral bit string arranged in a plurality of spirals on the inner circumferential surface.
According to such a configuration, the excavation capacity and the soil removal efficiency can be further improved by pulverizing the clot that has entered between the inner tube and the outer tube with the bit provided on the inner peripheral surface of the outer tube. it can.

また、本発明の杭施工用掘削装置では、前記外側管および前記内側管を回転駆動する1つの共通駆動部、または前記外側管と前記内側管とをそれぞれ独立して回転駆動する外側管用駆動部および内側管用駆動部、のいずれかを備え、前記外側管と前記内側管とは、前記1つの駆動部または前記複数の駆動部によって、互いに同一方向または逆方向の独立した方向に回転駆動されることが好ましい。
このような構成によれば、外側管および内側管の各々が同一方向または逆方向の独立した方向に回転駆動できるように構成されていることで、掘削能力を高め岩盤等の非常に硬度の高い地盤であっても削孔することができる。この際、外側管および内側管を互いに同一方向に回転させてもよく、外側管および内側管を互いに逆方向に回転させてもよいし、さらには地盤の状態に応じて同一方向と逆方向とを適宜に切り替えながら外側管および内側管を回転させるように、共通駆動部、または外側管用駆動部および内側管用駆動部によって駆動してもよい。
In the excavation apparatus for pile construction according to the present invention, one common drive unit that rotationally drives the outer tube and the inner tube, or an outer tube drive unit that independently rotates the outer tube and the inner tube. And the inner tube drive unit, and the outer tube and the inner tube are rotationally driven in the same direction or independent directions by the one drive unit or the plurality of drive units. It is preferable.
According to such a configuration, each of the outer tube and the inner tube can be driven to rotate independently in the same direction or in the opposite direction, thereby increasing the excavation capacity and extremely high hardness of the rock or the like. It is possible to drill holes even on the ground. At this time, the outer tube and the inner tube may be rotated in the same direction, the outer tube and the inner tube may be rotated in the opposite directions, and the same direction and the opposite direction depending on the state of the ground. The outer tube and the inner tube may be rotated while appropriately switching between them, and may be driven by the common drive unit, or the outer tube drive unit and the inner tube drive unit.

この際、本発明の杭施工用掘削装置では、前記排出手段は、前記内側管と前記共通駆動部または前記内側管用駆動部とを連結するロッドの外周に設けたスクリューの回転で掘削土を上方に搬送するスクリュー装置、前記ロッドの内部を通して掘削土を吸い上げるエアリフト装置、前記外側管の内部に供給した水とともに前記ロッドの内部を通して掘削土を吸い上げる泥水リフト装置のいずれかで構成されていることが好ましい。
このような構成によれば、スクリュー装置やエアリフト装置、泥水リフト装置から地盤の特性や杭の種別、サイズに応じた任意の装置を選択して排土手段を構成することで、掘削の作業効率を高めつつ経済的な掘削装置を構成することができる。
At this time, in the excavation apparatus for pile construction according to the present invention, the discharging means moves the excavating soil upward by rotation of a screw provided on an outer periphery of a rod connecting the inner pipe and the common driving section or the inner pipe driving section. A screw device that transports the excavated soil through the inside of the rod, and a mud lift device that sucks up the excavated soil through the rod together with the water supplied to the inside of the outer pipe. preferable.
According to such a configuration, excavation work efficiency can be achieved by configuring the soil removal means by selecting an arbitrary device according to the characteristics of the ground, the type of pile, and the size from the screw device, the air lift device, and the muddy water lift device. It is possible to construct an economical drilling rig while increasing the height.

一方、本発明の請求項10に記載の杭の施工方法は、前記したいずれかの杭施工用掘削装置を用いて掘削した地盤に杭を構築する杭の施工方法であって、前記杭施工用掘削装置を構成する外側管および内側管で地盤を掘削するとともに、当該内側管の内部の土を内部粉砕手段で粉砕し、粉砕した土を排出手段で地上に排出することを特徴とする。
このような杭の施工方法によれば、前述の杭施工用掘削装置と同様に、外側管および内側管による掘削を連続的に実施でき、掘削作業を効率的に実施し施工時間を短縮することができる。
On the other hand, the pile construction method according to claim 10 of the present invention is a pile construction method for constructing a pile on the ground excavated by using any of the above-mentioned pile construction excavating apparatuses, and for the pile construction The ground is excavated by the outer pipe and the inner pipe constituting the excavator, the soil inside the inner pipe is crushed by the internal crushing means, and the crushed soil is discharged to the ground by the discharging means.
According to such a pile construction method, similarly to the above-described pile construction excavator, the outer pipe and the inner pipe can be continuously excavated, the excavation work can be carried out efficiently, and the construction time can be shortened. Can do.

この際、本発明の杭の施工方法では、前記杭施工用掘削装置は、前記外側管および前記内側管を回転駆動する1つの共通駆動部、または前記外側管と前記内側管とをそれぞれ独立して回転駆動する外側管用駆動部および内側管用駆動部、のいずれかを備え、前記1つの駆動部または前記複数の駆動部によって、前記外側管と前記内側管とを互いに同一方向に回転駆動して地盤を掘削するか、または前記外側管と前記内側管とを互いに逆方向に回転駆動して地盤を掘削することが好ましい。
このような構成によれば、前述と同様に、外側管および内側管の各々が同一方向または逆方向の独立した方向に回転駆動できるように構成されていることで、掘削能力を高め岩盤等の非常に硬度の高い地盤であっても削孔することができる。
At this time, in the pile construction method of the present invention, the excavation apparatus for pile construction is configured such that one common drive unit that rotationally drives the outer tube and the inner tube, or the outer tube and the inner tube are independent of each other. And driving the outer tube and the inner tube in the same direction by the one driving unit or the plurality of driving units. It is preferable to excavate the ground or excavate the ground by rotating the outer pipe and the inner pipe in opposite directions.
According to such a configuration, as described above, each of the outer tube and the inner tube can be driven to rotate independently in the same direction or in the opposite direction, thereby increasing the excavation ability and Holes can be drilled even on very hard ground.

また、本発明の杭の施工方法では、前記外側管が前記杭を構成する鋼管杭で構成され、当該外側管を地盤の支持層に貫入させた後に前記共通駆動部または前記外側管用駆動部との連結を解除することが好ましい。
このような構成によれば、構造物を支持する本設の鋼管杭を外側管として利用することで、掘削完了と同時に鋼管杭の打設が完了することとなり、杭施工の短工期化および低コスト化を促進させることができる。すなわち、杭施工用掘削装置による掘削完了後に外側管を抜き取り、抜き取ってから本設用の杭(鋼管杭やPC杭、あるいは場所打ち杭等)を打設すると、掘削完了から本設杭の構築までに相当の作業手間および時間を要することとなるが、外側管をそのまま本設杭として利用すれば、作業手間および時間を節約して施工コストを減少させることができる。
Further, in the pile construction method of the present invention, the outer pipe is constituted by a steel pipe pile that constitutes the pile, and after the outer pipe is penetrated into the support layer of the ground, the common drive section or the outer pipe drive section and It is preferable to release the connection.
According to such a configuration, by using the steel pipe pile that supports the structure as an outer pipe, the steel pipe pile driving is completed at the same time as the excavation is completed. Costing can be promoted. That is, after the excavation by the pile construction excavator is completed, the outer pipe is extracted, and after the main pile (such as a steel pipe pile, PC pile, or cast-in-place pile) is placed, However, if the outer pipe is used as a main pile as it is, the labor and time can be saved and the construction cost can be reduced.

また、本発明の杭の施工方法では、前記内側管による掘削を前記支持層よりも上方で停止し、前記支持層上面から前記外側管の外径寸法以上の深さを当該外側管で掘削して支持層に貫入させることが好ましい。
さらに、本発明の杭の施工方法では、前記外側管の前記支持層への貫入寸法が当該外側管の外径寸法の2倍から5倍の範囲に設定されていることが好ましい。
このような構成によれば、支持層よりも上方で内側管の掘削を停止させ、支持層へは外側管のみで掘削して外側管を貫入させることで、支持層およびその近傍の地盤を必要以上に荒らすことなく、外側管の先端を所定深さまで支持層に貫入させることができ、鋼管杭としての先端支持力を確実に得ることができる。
Further, in the pile construction method of the present invention, the excavation by the inner pipe is stopped above the support layer, and the outer pipe is excavated from the upper surface of the support layer to a depth not less than the outer diameter dimension of the outer pipe. It is preferable to penetrate the support layer.
Furthermore, in the pile construction method of the present invention, it is preferable that the penetration dimension of the outer pipe into the support layer is set in a range of 2 to 5 times the outer diameter dimension of the outer pipe.
According to such a configuration, the excavation of the inner pipe is stopped above the support layer, and only the outer pipe is excavated into the support layer to penetrate the outer pipe, thereby requiring the support layer and the ground in the vicinity thereof. The tip of the outer pipe can be penetrated into the support layer to a predetermined depth without being roughened as described above, and the tip support force as a steel pipe pile can be reliably obtained.

また、本発明の杭の施工方法では、前記外側管の掘削完了以前に前記排出手段による掘削土の排出を停止し、前記外側管の先端内部に当該外側管の外径寸法の3倍以上の深さの土を残留させることが好ましい。
このような構成によれば、外側管の先端内部に外側管の外径寸法の3倍以上の深さの土を残留させることで、この残留させた土で鋼管杭としての外側管の先端を閉塞させることができ、閉塞による根固め効果によって先端支持力の向上を図ることができる。
Further, in the pile construction method of the present invention, the excavation of the excavated soil by the discharging means is stopped before the completion of the excavation of the outer pipe, and the outer diameter of the outer pipe is more than three times the outer diameter of the outer pipe. It is preferable to leave a soil of depth.
According to such a configuration, the tip of the outer pipe as a steel pipe pile is made to remain in the tip of the outer pipe by leaving the soil having a depth of three times or more the outer diameter of the outer pipe. The tip supporting force can be improved due to the root hardening effect caused by the blocking.

また、本発明の杭の施工方法では、前記杭施工用掘削装置を用いて掘削した後に掘削孔から前記外側管および内側管を抜き、前記掘削孔にコンクリートを打設して場所打ち杭を造成するか、または前記掘削孔に既成コンクリート杭あるいは鋼管杭を埋設して埋め込み杭を構築するしてもよい。
このような構成によれば、杭施工用掘削装置を用いて場所打ち杭造成のための掘削孔または埋め込み杭を埋設するための掘削孔を短時間かつ低コストで掘削することができる。この場合には、掘削完了後に外側管も掘削孔から抜き取るため、外側管を何度も使用することができる。
Further, in the pile construction method of the present invention, after the excavation using the pile construction excavator, the outer pipe and the inner pipe are extracted from the excavation hole, and concrete is placed in the excavation hole to form a cast-in-place pile. Alternatively, an embedded pile may be constructed by burying an existing concrete pile or a steel pipe pile in the excavation hole.
According to such a structure, the excavation hole for cast-in-place pile construction or the excavation hole for embedding an embedded pile can be excavated for a short time and at low cost using the excavation apparatus for pile construction. In this case, since the outer tube is also extracted from the excavation hole after completion of excavation, the outer tube can be used many times.

以上のような本発明の杭施工用掘削装置および杭の施工方法によれば、掘削土を連続的に排土することで掘削作業を効率的に実施し施工時間を短縮することができるとともに、二重管により硬質地盤部であっても比較的低トルクで削孔することができ、掘削装置の大型化や製造コストの増大を防止することができる。   According to the excavation apparatus for pile construction and the pile construction method of the present invention as described above, the excavation work can be efficiently carried out by continuously excavating the excavated soil, and the construction time can be shortened. With the double pipe, even a hard ground portion can be drilled with a relatively low torque, and an increase in the size of the excavator and an increase in manufacturing cost can be prevented.

以下、本発明の実施形態を図面に基づいて説明する。
図1は、本発明の実施形態に係る杭施工用掘削装置を示す断面図である。図2は、杭施工用掘削装置における要部を示す斜視図である。図3は、杭施工用掘削装置における内側管を示す断面図である。図4は、杭施工用掘削装置を用いた杭の施工方法を示す断面図である。
図1、図2において、杭施工用掘削装置は、杭打ち機Mに上下スライド自在に支持された共通駆動部としての二軸式ドーナツオーガー1と、この二軸式ドーナツオーガー1の外側の回転部支持部に支持された外側管としての外側鋼管2と、二軸式ドーナツオーガー1の内側の回転部支持部に支持されて外側鋼管2の内部に挿入されるロッド3と、このロッド3の先端部に固定された内側管としての内側鋼管4とを備えて構成されている。
ここで、本実施形態では、外側鋼管2と内側鋼管4とを独立して回転駆動する、つまり回転・停止や回転方向(同一方向か逆方向)を外側鋼管2と内側鋼管4とで任意に駆動制御可能な二軸式ドーナツオーガー1を共通駆動部として用いる。この共通駆動部の構成としては、例えば、モーター等の駆動源に連結された外側駆動軸と、この外側駆動軸にギア等を介して接続された内側駆動軸とを有し、外側駆動軸の回転駆動力で外側鋼管2を回転駆動するとともに、ギア等を介して内側駆動軸を回転させて内側鋼管4を回転駆動するものが採用できる。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing an excavation apparatus for pile construction according to an embodiment of the present invention. FIG. 2 is a perspective view showing a main part in the excavation apparatus for pile construction. FIG. 3 is a cross-sectional view showing an inner pipe in a pile construction excavator. FIG. 4 is a cross-sectional view illustrating a pile construction method using the pile construction excavation apparatus.
1 and 2, the excavation apparatus for pile construction includes a biaxial donut auger 1 as a common drive unit supported by a pile driving machine M so as to be slidable up and down, and rotation outside the biaxial donut auger 1. An outer steel pipe 2 as an outer pipe supported by the part support part, a rod 3 supported by a rotating part support part inside the biaxial donut auger 1 and inserted into the outer steel pipe 2, An inner steel pipe 4 as an inner pipe fixed to the tip end portion is provided.
Here, in the present embodiment, the outer steel pipe 2 and the inner steel pipe 4 are rotationally driven independently. That is, the outer steel pipe 2 and the inner steel pipe 4 are arbitrarily rotated / stopped and rotated (in the same direction or in the reverse direction). A biaxial donut auger 1 that can be driven and controlled is used as a common drive unit. As the configuration of this common drive unit, for example, it has an outer drive shaft connected to a drive source such as a motor, and an inner drive shaft connected to the outer drive shaft via a gear or the like. The outer steel pipe 2 can be rotationally driven by a rotational driving force, and the inner steel pipe 4 can be rotationally driven by rotating the inner drive shaft via a gear or the like.

なお、外側鋼管2および内側鋼管4を回転駆動する駆動手段としては、外側鋼管2および内側鋼管4をそれぞれ独立して回転駆動する外側管用駆動部および内側管用駆動部を有したものを用いてもよい。このような駆動手段としては、例えば、外側管用駆動部には全周旋回機等を用いて外側鋼管2を一方向に回転させ、内側管用駆動部には3点式杭打ち機等を用いて内側鋼管4を一方向あるいは逆方向に必要に応じて回転させるものや、外側鋼管2および内側鋼管4をそれぞれ独立に把持し、同一あるいは逆の方向に自由に回転させることが可能である2つの駆動部(外側管用駆動部および内側管用駆動部)を有した二軸式ドーナツオーガー等が採用できる。さらに外側管用駆動部および内側管用駆動部に加えて第三の駆動部を有した駆動手段を用いてもよく、この駆動手段としては、例えば、外側鋼管2を一方向に回転させる全周旋回機等を外側管用駆動部とし、内側鋼管4およびロッド3をそれぞれ独立に把持し、同一あるいは逆の方向に自由に回転させることが可能である2つの駆動部を有した二軸式ドーナツオーガー等を、内側管用駆動部および第三の駆動部として用いる構成であってもよい。そして、以上のような各構成を用いることで、外側鋼管2と内側鋼管4とを相対的に上下動させることが可能である。
また、駆動手段としては、外側鋼管2および内側鋼管4の互いの回転を独立の(同一・逆を自由な)方向で回転制御可能なものが好ましいが、独立の方向で回転制御せずに同一方向か逆方向かのいずれか所定の方向のみに回転駆動するタイプのものでもよい。ただし、土塊や岩石を粉砕するには、せん断力を与えることが有効な手段であり、外側鋼管2と内側鋼管4を同一方向および逆方向に必要に応じて回転させることで、効率よく土塊や岩石にせん断力を付与することが可能となる。
The driving means for rotationally driving the outer steel pipe 2 and the inner steel pipe 4 may be those having an outer pipe driving section and an inner pipe driving section for independently driving the outer steel pipe 2 and the inner steel pipe 4 to rotate. Good. As such a driving means, for example, the outer steel pipe 2 is rotated in one direction by using an all-around turning machine or the like for the outer pipe driving section, and a three-point pile driving machine or the like is used for the inner pipe driving section. The inner steel pipe 4 can be rotated in one direction or the opposite direction as required, and the outer steel pipe 2 and the inner steel pipe 4 can be gripped independently and freely rotated in the same or opposite direction. A biaxial donut auger or the like having a driving unit (an outer tube driving unit and an inner tube driving unit) can be employed. Further, in addition to the outer tube drive unit and the inner tube drive unit, a drive unit having a third drive unit may be used. As this drive unit, for example, an all-around swirler that rotates the outer steel pipe 2 in one direction. And the like, and a two-axis donut auger or the like having two drive parts that can independently rotate the inner steel pipe 4 and the rod 3 and rotate freely in the same or opposite directions. The inner tube drive unit and the third drive unit may be used. And it is possible to move the outer side steel pipe 2 and the inner side steel pipe 4 up and down relatively by using each structure as mentioned above.
Further, as the driving means, it is preferable that the rotation of the outer steel pipe 2 and the inner steel pipe 4 can be controlled in independent directions (the same and the reverse can be freely performed), but the same without rotation control in the independent directions. It may be of a type that is rotationally driven only in a predetermined direction of either the direction or the reverse direction. However, in order to pulverize a clot or rock, it is effective means to apply a shearing force. By rotating the outer steel pipe 2 and the inner steel pipe 4 in the same direction and in the opposite direction as needed, the clot or It is possible to apply a shearing force to the rock.

外側鋼管2および内側鋼管4のそれぞれの先端には、掘削用ビット2A,4Aが設けられており、これらの外側鋼管2および内側鋼管4の回転方向が互い逆向きとなるように二軸式ドーナツオーガー1で回転駆動かつ圧入されることで、外側鋼管2および内側鋼管4が地盤Gに貫入して掘削するようになっている。そして、ロッド3の先端は、連結支持部3Aを介して内側鋼管4の上端部内面に連結されるとともに、ロッド3の軸方向に沿った外周には、螺旋状のスクリュー3Bが設けられている。このスクリュー3Bは、ロッド3の回転に伴い掘削した土を下方から上方に搬送するスクリュー装置であり、このようなスクリュー3Bを有したロッド3によって本実施形態における排土手段が構成されている。さらに、二軸式ドーナツオーガー1には、スクリュー3Bで搬送された土を外部に排出するホッパー1Aが設けられている。   Excavation bits 2A and 4A are provided at the respective tips of the outer steel pipe 2 and the inner steel pipe 4, and the two-axis donuts are arranged so that the rotation directions of the outer steel pipe 2 and the inner steel pipe 4 are opposite to each other. The outer steel pipe 2 and the inner steel pipe 4 penetrate into the ground G and are excavated by being rotationally driven and press-fitted by the auger 1. And the front-end | tip of the rod 3 is connected with the inner surface of the upper end part of the inner side steel pipe 4 via the connection support part 3A, and the helical screw 3B is provided in the outer periphery along the axial direction of the rod 3. . The screw 3B is a screw device that transports the excavated soil from below to above as the rod 3 rotates, and the rod 3 having such a screw 3B constitutes the soil discharging means in the present embodiment. Further, the biaxial donut auger 1 is provided with a hopper 1A for discharging the soil conveyed by the screw 3B to the outside.

次に、内側鋼管4は、図3に示すように、その内周面に突出して設けられた複数の粉砕ビット4Bが設けられており、これらの粉砕ビット4Bによって本実施形態における内部粉砕手段が構成されている。複数の粉砕ビット4Bは、螺旋状に並べられた螺旋ビット列を形成しており、この螺旋ビット列は、ロッド3のスクリュー3Bと同一の配列方向、つまりロッド3の回転に伴い内側鋼管4内部に取り込んだ土塊を上方に搬送させる方向に並べられている。また、粉砕ビット4B同士の間隔としては、掘削する対象地盤の粒径の3倍程度に設定されていることがが望ましいが、粉砕ビット4Bを多数設けることで取り込んだ土塊の粉砕性が良くなるため、粉砕ビット4B同士の間隔を掘削する対象地盤の粒径の1倍程度まで近づけてもよい。内側鋼管4の先端の掘削用ビット4Aおよび内周面の粉砕ビット4Bは、繰返しの使用に耐えられるように超硬ビット等を使用することが望ましく、内側鋼管4へは溶接、ロウ付け等で取り付けられている。   Next, as shown in FIG. 3, the inner steel pipe 4 is provided with a plurality of crushing bits 4B provided so as to protrude from the inner peripheral surface thereof, and the crushing bits 4B serve as internal crushing means in the present embodiment. It is configured. The plurality of crushing bits 4B form a spiral bit string arranged in a spiral, and this spiral bit string is taken into the inner steel pipe 4 in the same arrangement direction as the screw 3B of the rod 3, that is, as the rod 3 rotates. It is lined up in the direction to transport the mud. The interval between the pulverization bits 4B is preferably set to about three times the particle size of the target ground to be excavated, but by providing a large number of pulverization bits 4B, the crushability of the taken-up mass improves. Therefore, the interval between the pulverization bits 4B may be close to about 1 time the particle size of the target ground to be excavated. The excavation bit 4A at the tip of the inner steel pipe 4 and the pulverization bit 4B on the inner peripheral surface are preferably made of carbide bits so that they can withstand repeated use. The inner steel pipe 4 can be welded, brazed, or the like. It is attached.

このような内側鋼管4は、二軸式ドーナツオーガー1の駆動によりロッド3を介して回転圧入されることで、掘削用ビット4Aで地盤Gをコア状に掘削して内部に土塊を取り込むとともに、取り込んだ土塊を粉砕ビット4Bで細かく粉砕する。そして、粉砕された土が前記スクリュー3Bで上方に搬送されるとともにホッパー1Aから外部に排出されるようになっている。また、ロッド3と内側鋼管4との連結支持部3Aは、ロッド3の先端から四方に延びた十字形の支柱から構成されており、粉砕した土塊の動きを妨げにくくなっている。なお、連結支持部3Aとしては、高さ方向に位置が異なる千鳥状に配置した支柱等で構成されたものでもよく、粉砕した土塊の上昇に対して抵抗がより小さくなる形態が好ましい。   Such an inner steel pipe 4 is rotationally press-fitted through the rod 3 by driving the biaxial donut auger 1 to excavate the ground G into a core shape with the excavating bit 4A and take in the clot inside. The taken-up mass is pulverized finely with the pulverization bit 4B. The crushed soil is conveyed upward by the screw 3B and discharged from the hopper 1A. Moreover, the connection support part 3A of the rod 3 and the inner steel pipe 4 is composed of a cross-shaped column extending in four directions from the tip of the rod 3, and is difficult to prevent the movement of the crushed soil mass. In addition, as the connection support part 3A, it may be configured by struts or the like arranged in a staggered manner with different positions in the height direction, and a form in which the resistance is further reduced with respect to the rising of the crushed soil mass.

次に、本実施形態の杭施工用掘削装置を用いた掘削手順を説明する。
ここで、杭施工用掘削装置で掘削する地盤Gとしては、図1、図4に示すように、地表側から砂質や粘土質を多く含んだ比較的軟弱な第1軟弱層G1と、第1軟弱層G1の下側に位置して砂礫等を多く含んだ比較的硬質な中間層G2と、中間層G2の下側に位置して比較的軟弱な第2軟弱層G3と、第2軟弱層G3の下側に位置して礫や岩盤等で構成され硬質な支持層G4とから構成されているものとする。
Next, an excavation procedure using the excavation apparatus for pile construction according to the present embodiment will be described.
Here, as the ground G excavated by the pile construction excavator, as shown in FIGS. 1 and 4, a relatively soft first soft layer G1 containing a lot of sand and clay from the ground surface side, 1 relatively soft intermediate layer G2 containing a lot of gravel and the like located below the soft layer G1, a relatively soft second soft layer G3 located below the intermediate layer G2, and a second soft layer It is assumed that it is composed of a hard support layer G4 made of gravel, bedrock or the like located below the layer G3.

掘削手順としては先ず、外側鋼管2と、内側鋼管4を接続したロッド3とを二軸式ドーナツオーガー1に接続するために、一旦クレーン等を用いて吊り上げ、外側鋼管2内に内側鋼管4およびロッド3を挿入してから、これらのロッド3および外側鋼管2をそれぞれ二軸式ドーナツオーガー1の内外の回転支持部に装着する。
次に、外側鋼管2および内側鋼管4の先端を掘削位置にセットしてから、二軸式ドーナツオーガー1で外側鋼管2とロッド3とをそれぞれ逆方向に回転させるとともに押し下げ、外側鋼管2および内側鋼管4の先端の掘削用ビット2A,4Aを用いて地盤Gを掘削し、第1軟弱層G1、中間層G2および第2軟弱層G3に外側鋼管2および内側鋼管4を貫入させる。
この貫入の際、内側鋼管4の内部に入り込んだ掘削土の土塊を、内側鋼管4の粉砕ビット4Bで粉砕しつつ上方のスクリュー3Bに送り、この粉砕された土をスクリュー3Bで上方に搬送し、ホッパー1Aから外部に排出する。
As an excavation procedure, first, in order to connect the outer steel pipe 2 and the rod 3 to which the inner steel pipe 4 is connected to the biaxial donut auger 1, the crane is once lifted, and the inner steel pipe 4 and After inserting the rods 3, these rods 3 and the outer steel pipe 2 are respectively mounted on the inner and outer rotation support portions of the biaxial donut auger 1.
Next, after the tips of the outer steel pipe 2 and the inner steel pipe 4 are set at the excavation position, the outer steel pipe 2 and the rod 3 are rotated in the opposite directions and pushed down by the biaxial donut auger 1 respectively, and the outer steel pipe 2 and the inner steel pipe 2 are pushed down. The ground G is excavated using the excavation bits 2A and 4A at the tip of the steel pipe 4, and the outer steel pipe 2 and the inner steel pipe 4 are penetrated into the first soft layer G1, the intermediate layer G2, and the second soft layer G3.
During this penetration, the excavated soil lump that has entered the inside of the inner steel pipe 4 is sent to the upper screw 3B while being crushed by the crushing bit 4B of the inner steel pipe 4, and the crushed earth is conveyed upward by the screw 3B. , Discharged from the hopper 1A to the outside.

次に、二軸式ドーナツオーガー1のトルク値に基づいて、外側鋼管2および内側鋼管4の先端が支持層G4に到達したことを検知すれば、図1に示すように、内側鋼管4の先端が支持層G4の上側に位置した状態で二軸式ドーナツオーガー1によるロッド3の回転および圧入を停止し、これによりスクリュー3Bでの排土も停止する。そして、二軸式ドーナツオーガー1で外側鋼管2の回転および圧入のみを継続し、外側鋼管2先端の掘削用ビット2Aにより支持層G4を掘削し、外側鋼管2の先端を支持層G4に貫入させる。ここで、外側鋼管2先端の支持層G4への貫入深さは、外側鋼管2の外径寸法の2倍から5倍程度の深さ寸法(例えば、4倍程度)であることが好ましい。そして、前述のように内側鋼管4の回転停止によって排土を停止したことで、外側鋼管2の内部にコア状の土塊を残留させる。この残留させる土塊の外側鋼管2先端からの高さ寸法は、外側鋼管2の外径寸法の3倍以上であることが好ましい。なお、外側鋼管2の杭頭部を地盤G表面よりも下側まで貫入させる場合には、その深さに応じた位置で外側鋼管2と二軸式ドーナツオーガー1とを一旦切り離し、外側鋼管2の杭頭部と二軸式ドーナツオーガー1との間にヤットコ等の連結治具(不図示)を連結してから、この連結治具を介して外側鋼管2を回転、圧入し、所定深さまで貫入してもよい。   Next, if it is detected that the tips of the outer steel pipe 2 and the inner steel pipe 4 have reached the support layer G4 based on the torque value of the biaxial donut auger 1, as shown in FIG. Is stopped above the support layer G4, the rotation and press-fitting of the rod 3 by the biaxial donut auger 1 are stopped, and the earth removal by the screw 3B is also stopped. Then, the rotation and press-fitting of the outer steel pipe 2 are continued with the biaxial donut auger 1, and the support layer G4 is excavated by the excavating bit 2A at the distal end of the outer steel pipe 2, and the distal end of the outer steel pipe 2 is penetrated into the support layer G4. . Here, it is preferable that the penetration depth to the support layer G4 at the distal end of the outer steel pipe 2 is a depth dimension (for example, about four times) twice to five times the outer diameter dimension of the outer steel pipe 2. Then, as described above, the earth removal is stopped by stopping the rotation of the inner steel pipe 4, thereby leaving a core-like soil mass inside the outer steel pipe 2. It is preferable that the height dimension from the front end of the outer steel pipe 2 of the soil block to remain is at least three times the outer diameter dimension of the outer steel pipe 2. When the pile head of the outer steel pipe 2 is penetrated below the surface of the ground G, the outer steel pipe 2 and the biaxial donut auger 1 are once separated at a position corresponding to the depth, and the outer steel pipe 2 After connecting a connecting jig (not shown) such as a yatco between the pile head and the biaxial donut auger 1, the outer steel pipe 2 is rotated and press-fitted through this connecting jig to a predetermined depth. It may penetrate.

以上のようにして外側鋼管2の先端を支持層G4に貫入させた後に、外側鋼管2を二軸式ドーナツオーガー1(またはヤットコ等の連結治具)から切り離すとともに、内側鋼管4およびロッド3とともに二軸式ドーナツオーガー1を上昇させて、内側鋼管4およびロッド3を外側鋼管2から抜き出す。なお、外側鋼管2とロッド3とを独立して上下駆動不能な二軸式ドーナツオーガー1を用いる場合には、外側鋼管2の先端を支持層G4に根入れする前に、内側鋼管4およびロッド3を外側鋼管2から抜き出してから、外側鋼管2を支持層G4に貫入させてもよい。そして、外側鋼管2を本設の鋼管杭として利用するために杭頭部分の後処理を実施するとともに、内側鋼管4およびロッド3とともに杭打ち機Mを次の掘削位置へ移動させたり、内側鋼管4およびロッド3を二軸式ドーナツオーガー1から取り外したりして杭の施工作業が完了する。   After the front end of the outer steel pipe 2 is inserted into the support layer G4 as described above, the outer steel pipe 2 is separated from the biaxial donut auger 1 (or a connecting jig such as a Yatsuko), and together with the inner steel pipe 4 and the rod 3 The biaxial donut auger 1 is raised and the inner steel pipe 4 and the rod 3 are extracted from the outer steel pipe 2. In addition, when using the biaxial donut auger 1 which cannot drive the outer steel pipe 2 and the rod 3 independently, before the tip of the outer steel pipe 2 is rooted in the support layer G4, the inner steel pipe 4 and the rod 3 may be extracted from the outer steel pipe 2, and the outer steel pipe 2 may be inserted into the support layer G4. And, in order to use the outer steel pipe 2 as a steel pipe pile of the main construction, the pile head portion is post-treated, and the pile driving machine M is moved to the next excavation position together with the inner steel pipe 4 and the rod 3, or the inner steel pipe 4 and the rod 3 are removed from the biaxial donut auger 1 to complete the pile construction work.

なお、内側鋼管4としては、上述した形態に限らず、以下の図5〜図7に示すような各種形態が適用可能である。
図5に示す内側鋼管4では、複数の粉砕ビット4Bが周方向に並べられた一段のビット列を形成しており、このビット列によって内部粉砕手段が構成されている。これらの粉砕ビット4Bは、内側鋼管4の先端からその直径の1倍程度上方に固定されることが望ましいが、掘削する対象地盤の礫径に応じて変化させてもよい。なお、粉砕ビット4Bのビット列としては、一段のものに限らず、複数段に設けられていてもよい。また、内側鋼管4の内周面に設けられる内部粉砕手段としては、前述のように複数の粉砕ビット4Bが列状に並べられたものに限らず、少なくとも1つの粉砕ビット4Bを有して構成されていればよく、複数の粉砕ビット4Bがランダムに配置されたものでもよい。
In addition, as the inner side steel pipe 4, not only the form mentioned above but various forms as shown in the following FIGS. 5-7 are applicable.
In the inner steel pipe 4 shown in FIG. 5, a plurality of pulverization bits 4B are formed in a single-stage bit string arranged in the circumferential direction, and the internal pulverization means is constituted by this bit string. These crushing bits 4B are preferably fixed about 1 time above the diameter from the tip of the inner steel pipe 4, but may be changed according to the gravel diameter of the target ground to be excavated. Note that the bit string of the pulverization bit 4B is not limited to a one-stage one, and may be provided in a plurality of stages. Further, the internal crushing means provided on the inner peripheral surface of the inner steel pipe 4 is not limited to the one in which the plurality of crushing bits 4B are arranged in a row as described above, and has at least one crushing bit 4B. What is necessary is just to be made, and the thing by which the some grinding | pulverization bit 4B was arrange | positioned at random may be used.

また、図6に示す内側鋼管4では、その内部に位置するロッド3との連結支持部3Aに複数の粉砕ビット4Cが設けられており、これらの粉砕ビット4Cによって連結部粉砕手段が構成されている。粉砕ビット4Cは、連結支持部3Aから下向きに固定されており、内側鋼管4内部に取り込まれて上昇するコア状の土塊をスクリュー3Bの手前で粉砕するように構成されている。
さらに、図7に示す内側鋼管4では、その外周面に螺旋状に並べられた複数の粉砕ビット4Dからなる螺旋ビット列が設けられており、この螺旋ビット列によって外部粉砕手段が構成されている。これらの粉砕ビット4Dは、内側鋼管4と外側鋼管2との間に入り込んだ土を粉砕するように構成されている。なお、外部粉砕手段としては、複数の粉砕ビット4Dが螺旋状に並べられたものに限らず、周方向に並べられた少なくとも一段のビット列で構成されてもよく、また1つの粉砕ビット4Dやランダムに配置された複数の粉砕ビット4Cで構成されていてもよい。
一方、外側鋼管2としても、以下の図8に示すような形態が適用可能である。
図8に示す外側鋼管2では、その先端部近傍における内側鋼管4と対向する内周面に複数の粉砕ビット2Bが設けられており、これらの粉砕ビット2Bによって内側鋼管4と外側鋼管2との間に入り込んだ土を粉砕するように構成されている。
Further, in the inner steel pipe 4 shown in FIG. 6, a plurality of crushing bits 4C are provided on the connecting support portion 3A with the rod 3 located inside thereof, and the crushing bits 4C constitute a connecting portion crushing means. Yes. The pulverization bit 4C is fixed downward from the connection support portion 3A, and is configured to pulverize the core-shaped soil mass that is taken into the inner steel pipe 4 and rises before the screw 3B.
Furthermore, the inner steel pipe 4 shown in FIG. 7 is provided with a spiral bit string composed of a plurality of pulverization bits 4D arranged in a spiral on the outer peripheral surface thereof, and the spiral bit string constitutes external pulverization means. These crushing bits 4D are configured to crush the soil that has entered between the inner steel pipe 4 and the outer steel pipe 2. The external crushing means is not limited to a plurality of crushing bits 4D arranged in a spiral shape, and may be composed of at least one bit string arranged in the circumferential direction, or one crushing bit 4D or random It may be composed of a plurality of crushing bits 4C arranged in
On the other hand, also as the outer steel pipe 2, a form as shown in the following FIG. 8 is applicable.
In the outer steel pipe 2 shown in FIG. 8, a plurality of crushing bits 2B are provided on the inner peripheral surface facing the inner steel pipe 4 in the vicinity of the tip, and the crushing bits 2B allow the inner steel pipe 4 and the outer steel pipe 2 to be connected. It is configured to crush the soil that has entered between.

このような本実施形態によれば、以下のような効果がある。
(1)すなわち、二軸式ドーナツオーガー1で回転、圧入される外側鋼管2および内側鋼管4で地盤Gを掘削し、掘削した掘削土をスクリュー3Bで地上に搬送し、ホッパー1Aから排出することで、外側鋼管2および内側鋼管4の掘削用ビット2A,4Aによる掘削を連続的に実施でき、掘削作業を効率的に実施して施工時間が短縮化できる。
According to this embodiment, there are the following effects.
(1) That is, the ground G is excavated by the outer steel pipe 2 and the inner steel pipe 4 that are rotated and press-fitted by the biaxial donut auger 1, and the excavated excavated soil is transported to the ground by the screw 3B and discharged from the hopper 1A. Thus, excavation of the outer steel pipe 2 and the inner steel pipe 4 by the excavation bits 2A and 4A can be continuously performed, and excavation work can be efficiently performed to shorten the construction time.

(2)さらに、内側鋼管4に内部粉砕手段としての粉砕ビット4Bが設けられ、この粉砕ビット4Bで内側鋼管4内部に取り込んだ土塊を粉砕することで、コア状の土塊を細かくしてスクリュー3Bによる排土が容易になり、さらに掘削作業を高速化することができる。また、内側鋼管4に連結部粉砕手段としての粉砕ビット4Cや外部粉砕手段としての粉砕ビット4Dを設けた場合にも同様に、内側鋼管4に内部や内側鋼管4と外側鋼管2との間に入り込んだ土を粉砕して排土しやすくできる。さらに、外側鋼管2の内周面に粉砕ビット2Bを設けた場合には、内側鋼管4と外側鋼管2との間の土を粉砕しやすくできる。 (2) Further, the inner steel pipe 4 is provided with a crushing bit 4B as an internal crushing means. By crushing the earth lump taken into the inner steel pipe 4 with this crushing bit 4B, the core-like earth lump is made finer and the screw 3B. The excavation work can be made faster and the excavation work can be speeded up. Similarly, when the inner steel pipe 4 is provided with the pulverization bit 4C as the connecting portion pulverization means and the pulverization bit 4D as the outer pulverization means, the inner steel pipe 4 is provided between the inner and inner steel pipes 4 and the outer steel pipe 2. It can be easily crushed by removing the soil. Furthermore, when the crushing bit 2B is provided on the inner peripheral surface of the outer steel pipe 2, the soil between the inner steel pipe 4 and the outer steel pipe 2 can be easily crushed.

(3)また、各々の先端に掘削用ビット2A,4Aを備えた外側鋼管2および内側鋼管4からなる二重管で地盤G掘削することで、硬質地盤部であっても比較的低トルクで掘削することができ、掘削装置の大型化や製造コストの増大を防止することができる。さらに、外側鋼管2および内側鋼管4を互いに逆の回転方向に回転させて掘削することで、岩盤等の非常に硬質な地盤であっても高速に掘削することができる。 (3) Further, by excavating the ground G with a double pipe comprising the outer steel pipe 2 and the inner steel pipe 4 provided with the excavating bits 2A and 4A at the respective ends, relatively low torque can be obtained even in a hard ground portion. It is possible to excavate, and an increase in the size of the excavator and an increase in manufacturing cost can be prevented. Furthermore, by excavating by rotating the outer steel pipe 2 and the inner steel pipe 4 in mutually opposite rotation directions, even a very hard ground such as a rock can be excavated at high speed.

(4)また、支持層G4に到達したら内側鋼管4の回転圧入を停止し、外側鋼管2のみを支持層G4に所定深さだけ貫入させることで、外側鋼管2を本設用の鋼管杭として利用する際の根入れ深さを確保し、支持力を確実に得ることができる。この際、外側鋼管2の先端内部に所定高さのコア状の土塊を残留させることで、鋼管杭の先端を閉塞させることができ、閉塞による根固め効果によって先端支持力の向上を図ることができる。 (4) When the support layer G4 is reached, the rotary press-fitting of the inner steel pipe 4 is stopped, and only the outer steel pipe 2 is penetrated into the support layer G4 by a predetermined depth, thereby making the outer steel pipe 2 a steel pipe pile for permanent installation. It is possible to secure the depth of penetration when using it and to obtain the supporting force with certainty. At this time, the tip of the steel pipe pile can be closed by leaving a core-shaped soil block of a predetermined height in the inside of the tip of the outer steel pipe 2, and the tip support force can be improved by the rooting effect by the blockage. it can.

(5)さらに、外側鋼管2を本設用の鋼管杭として利用することで、掘削完了と同時に鋼管杭の打設が完了することとなり、杭施工の短工期化および低コスト化を促進させることができる。 (5) Furthermore, by using the outer steel pipe 2 as a steel pipe pile for main construction, the placement of the steel pipe pile will be completed at the same time as the completion of excavation, and the shortening of construction time and cost reduction of the pile construction will be promoted. Can do.

なお、本発明は、前記実施形態に限定されるものではなく、本発明の目的を達成できる他の構成等を含み、以下に示すような変形等も本発明に含まれる。
例えば、前記実施形態においては、外側鋼管2のみ支持層G4に所定深さだけ貫入させて本設用の鋼管杭として利用したが、このような用途に限らず本発明の杭施工用掘削装置を、場所打ちコンクリート杭の造成用に利用してもよく、また既成コンクリート杭あるいは鋼管杭等の埋め込み杭の構築用に利用してもよい。また、前記実施形態では、排土手段をロッド3に設けたスクリュー3Bで構成したが、これに限らず、以下の図9に示すような排土手段を用いてもよい。
In addition, this invention is not limited to the said embodiment, Including other structures etc. which can achieve the objective of this invention, the deformation | transformation etc. which are shown below are also contained in this invention.
For example, in the above-described embodiment, only the outer steel pipe 2 is penetrated into the support layer G4 by a predetermined depth and used as a steel pipe pile for permanent installation. However, the present invention is not limited to this application, and the excavation apparatus for pile construction according to the present invention is used. It may be used for the construction of cast-in-place concrete piles, or for the construction of embedded piles such as precast concrete piles or steel pipe piles. Moreover, in the said embodiment, although the earth discharging means was comprised with the screw 3B provided in the rod 3, it is not restricted to this, You may use the earth discharging means as shown in the following FIG.

図9には、本発明の変形例に係る杭施工用掘削装置が示されている。
この変形例では、前記実施形態と比較して排土手段の構成が相違している。具体的には、図9の杭施工用掘削装置は、ロッド3の内部を通して外側鋼管2および内側鋼管4内部の掘削土を吸い上げるエアリフト装置で排土手段が構成されている。このエアリフト装置は、二軸式ドーナツオーガー1に設けたエアポンプ(図示略)と、このエアポンプに連結された中空筒状のロッド3と、ロッド3で吸い上げた掘削土を外部に排出する排出部1Bとを有して構成されている。ここで、排土手段としては、エアリフト装置に限らず、外側鋼管2の内部に供給した水とともにロッド3の内部を通して掘削土を吸い上げる泥水リフト装置であってもよい。
FIG. 9 shows a pile construction excavation apparatus according to a modification of the present invention.
In this modification, the structure of the soil discharging means is different from that in the above embodiment. Specifically, the excavation apparatus for pile construction shown in FIG. 9 includes an air lift device that sucks excavated soil inside the outer steel pipe 2 and the inner steel pipe 4 through the inside of the rod 3 and constitutes a soil discharging means. This air lift device includes an air pump (not shown) provided in a biaxial donut auger 1, a hollow cylindrical rod 3 connected to the air pump, and a discharge unit 1B that discharges excavated soil sucked up by the rod 3 to the outside. And is configured. Here, the soil discharging means is not limited to the air lift device, but may be a muddy water lift device that sucks excavated soil through the inside of the rod 3 together with the water supplied to the inside of the outer steel pipe 2.

また、図9の杭施工用掘削装置では、前記実施形態のように支持層G4に外側鋼管2のみを貫入させるのではなく、外側鋼管2および内側鋼管4の両方を支持層G4に貫入させて掘削孔を形成する点が前記実施形態と相違している。すなわち、図9における杭の施工方法は、支持層G4を所定深さまで掘削して掘削孔を形成した後に、外側鋼管2および内側鋼管4の両方を掘削孔から抜き出し、この掘削孔にコンクリートを打設して場所打ち杭を造成するか、または掘削孔に既成コンクリート杭あるいは鋼管杭を埋設して埋め込み杭を構築するものである。このように本発明の杭施工用掘削装置を用いれば、場所打ち杭造成のための掘削孔または埋め込み杭を埋設するための掘削孔を短時間かつ低コストで掘削することができる。この場合には、掘削完了後に外側鋼管2も掘削孔から抜き取るため、外側鋼管2を何度も使用することができる。   Moreover, in the excavation apparatus for pile construction of FIG. 9, not only the outer steel pipe 2 penetrates into the support layer G4 as in the above embodiment, but both the outer steel pipe 2 and the inner steel pipe 4 penetrate into the support layer G4. The point which forms a drilling hole is different from the said embodiment. That is, in the pile construction method in FIG. 9, after excavating the support layer G4 to a predetermined depth to form an excavation hole, both the outer steel pipe 2 and the inner steel pipe 4 are extracted from the excavation hole, and concrete is poured into the excavation hole. The cast-in-place piles are constructed to install them, or the built-in piles are constructed by embedding existing concrete piles or steel pipe piles in the excavation holes. Thus, if the excavation apparatus for pile construction of this invention is used, the excavation hole for embedding a cast-in-place pile or the excavation hole for embedding an embedded pile can be excavated in a short time and at low cost. In this case, since the outer steel pipe 2 is also extracted from the excavation hole after completion of excavation, the outer steel pipe 2 can be used many times.

また、前記実施形態では、内部粉砕手段としての粉砕ビット4B、連結部粉砕手段としての粉砕ビット4C、および外部粉砕手段としての粉砕ビット4Dをそれぞれ別々に内側鋼管4に設けた例を説明したが、これらの内部粉砕手段、連結部粉砕手段および外部粉砕手段を適宜に選択して併用してもよい。さらに、図8に示したような外側鋼管2の内周面に設けた粉砕ビット2Bと、内側鋼管4の内部粉砕手段、連結部粉砕手段および外部粉砕手段とについても適宜に併用可能である。   In the above-described embodiment, the example in which the pulverization bit 4B as the internal pulverization unit, the pulverization bit 4C as the coupling unit pulverization unit, and the pulverization bit 4D as the external pulverization unit are provided separately on the inner steel pipe 4 is described. These internal pulverizing means, connecting part pulverizing means and external pulverizing means may be appropriately selected and used in combination. Furthermore, the pulverization bit 2B provided on the inner peripheral surface of the outer steel pipe 2 as shown in FIG. 8 and the internal pulverization means, the connecting part pulverization means, and the external pulverization means of the inner steel pipe 4 can be used together as appropriate.

また、図10は先端に掘削ビットを備えた鋼管杭を、支持層のような堅固な地盤に回転させながら施工する実験を行った際の、施工負荷を示す施工トルクおよび圧入力を示しており、貫入量が鋼管の外径の3倍程度で急上昇する。さらに図11に示すように鋼管先端部の管内に取り込んだ土による閉塞度を調べるために、貫入量毎に管内土を押し抜く試験を行った。これは先端に掘削ビットを設けた模型鋼管杭5を、実際に支持層として利用される地盤の硬度と同程度の硬度を持った模型地盤に模型鋼管杭5の外径の数倍回転圧入させ、その後模型鋼管杭5を模型地盤から引抜き、模型鋼管杭5の先端部内側に取り込んだ模型地盤の部分である管内土6を受け台7に押し当て、受け台7に向かって模型鋼管杭5に載荷重Fを加えて管内土6を押し抜く試験である。模型鋼管杭5の先端部内側に取り込んだ模型地盤の部分を閉塞土と呼ぶこととする。結果は、図12に示すとおり、図10に示す施工トルクと類似の傾向を示し、押抜き抵抗値は、貫入量が鋼管の外径の3倍程度で急激に上昇する。この実験結果より、特に管内に進入する土塊の粘性が高い場合など、土塊と内側鋼管4が共回りを起こし易く粉砕ビット4Bでの土塊の粉砕が困難な場合には、本発明に用いる内側鋼管4の長さは、内側鋼管4の外径の3倍以内にすることで内側鋼管4の閉塞を防止することが可能であり、施工負荷の上昇を抑えることが可能である。
また、図10、12に示す実験結果は2重管ではなく単管での実験の結果であるが、管内の閉塞に関しては、管の内側に侵入してくる土塊と管の内面との関係のみで発生するため、2重管であっても単管であっても試験結果に影響は見られない。
In addition, Fig. 10 shows the construction torque and pressure input showing the construction load when conducting an experiment in which a steel pipe pile with a drill bit at the tip is rotated on a solid ground such as a support layer. , The amount of penetration rapidly rises about 3 times the outer diameter of the steel pipe. Furthermore, as shown in FIG. 11, in order to investigate the degree of blockage by the soil taken into the pipe at the tip of the steel pipe, a test was conducted to push out the pipe soil for each penetration amount. This is because the model steel pipe pile 5 provided with a drilling bit at the tip is press-fitted several times the outer diameter of the model steel pipe pile 5 into the model ground having the same hardness as the ground actually used as the support layer. Then, the model steel pipe pile 5 is pulled out from the model ground, and the pipe soil 5 that is the part of the model ground taken inside the tip end portion of the model steel pipe pile 5 is pressed against the cradle 7, and the model steel pipe pile 5 is directed toward the cradle 7. This is a test in which a loading load F is applied to the pipe soil 6 to push it out. The part of the model ground taken inside the tip end of the model steel pipe pile 5 will be called closed soil. As shown in FIG. 12, the result shows a tendency similar to the construction torque shown in FIG. 10, and the punching resistance value increases rapidly when the penetration amount is about three times the outer diameter of the steel pipe. From this experimental result, the inner steel pipe used in the present invention is particularly suitable when the earth lump and the inner steel pipe 4 are liable to co-rotate and it is difficult to crush the earth lump with the crushing bit 4B. By making the length of 4 within 3 times the outer diameter of the inner steel pipe 4, it is possible to prevent the inner steel pipe 4 from being blocked, and to suppress an increase in the construction load.
The experimental results shown in FIGS. 10 and 12 are the results of an experiment using a single tube instead of a double tube. Regarding the blockage in the tube, only the relationship between the soil mass entering the inside of the tube and the inner surface of the tube is shown. Therefore, there is no effect on the test results regardless of whether the tube is a double tube or a single tube.

その他、本発明を実施するための最良の構成、方法などは、以上の記載で開示されているが、本発明は、これに限定されるものではない。すなわち、本発明は、主に特定の実施形態に関して特に図示され、かつ説明されているが、本発明の技術的思想および目的の範囲から逸脱することなく、以上述べた実施形態に対し、形状、材質、数量、その他の詳細な構成において、当業者が様々な変形を加えることができるものである。
従って、上記に開示した形状、材質などを限定した記載は、本発明の理解を容易にするために例示的に記載したものであり、本発明を限定するものではないから、それらの形状、材質などの限定の一部もしくは全部の限定を外した部材の名称での記載は、本発明に含まれるものである。
In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described with particular reference to certain specific embodiments, but without departing from the spirit and scope of the invention, Various modifications can be made by those skilled in the art in terms of material, quantity, and other detailed configurations.
Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

本発明の実施形態に係る杭施工用掘削装置を示す断面図である。It is sectional drawing which shows the excavation apparatus for pile construction which concerns on embodiment of this invention. 前記杭施工用掘削装置における要部を示す斜視図である。It is a perspective view which shows the principal part in the said excavation apparatus for pile construction. 前記杭施工用掘削装置における内側管を示す断面図である。It is sectional drawing which shows the inner side pipe in the said excavation apparatus for pile construction. 前記杭施工用掘削装置を用いた杭の施工方法を示す断面図である。It is sectional drawing which shows the construction method of the pile using the said excavation apparatus for pile construction. 前記内側管の変形例を示す断面図である。It is sectional drawing which shows the modification of the said inner side pipe | tube. 前記内側管の変形例を示す断面図である。It is sectional drawing which shows the modification of the said inner side pipe | tube. 前記内側管の変形例を示す斜視図である。It is a perspective view which shows the modification of the said inner side pipe | tube. 前記杭施工用掘削装置の変形例を示す断面図である。It is sectional drawing which shows the modification of the said excavation apparatus for pile construction. 本発明の変形例に係る杭の施工方法を示す断面図である。It is sectional drawing which shows the construction method of the pile which concerns on the modification of this invention. 施工負荷を示すトルクおよび圧入力に対する鋼管杭の貫入量の杭径に対する倍率の関係を示したグラフである。It is the graph which showed the relationship of the magnification with respect to the pile diameter of the penetration amount of the steel pipe pile with respect to the torque and pressure input which show construction load. 模型試験の状況を説明した図である。It is a figure explaining the condition of a model test. 模型試験結果の押抜き抵抗と模型鋼管杭の貫入量の杭径に対する倍率の関係を示したグラフである。It is the graph which showed the relationship between the punching resistance of a model test result, and the magnification with respect to the pile diameter of the penetration amount of a model steel pipe pile.

符号の説明Explanation of symbols

1…共通駆動部としての二軸式ドーナツオーガー、2…外側管としての外側鋼管、2A…掘削用ビット、2B…粉砕ビット、3…ロッド、3A…連結支持部、3B…スクリュー、4…内側管としての内側鋼管、4A…掘削用ビット、4B…内部粉砕手段としての粉砕ビット、4C…連結部粉砕手段としての粉砕ビット、4D…外部粉砕手段としての粉砕ビット、5…模型鋼管杭、6…管内土、7…受け台、G…地盤、G4…支持層。   DESCRIPTION OF SYMBOLS 1 ... Biaxial donut auger as a common drive part, 2 ... Outer steel pipe as an outer pipe, 2A ... Excavation bit, 2B ... Grinding bit, 3 ... Rod, 3A ... Connection support part, 3B ... Screw, 4 ... Inside Inner steel pipe as pipe, 4A ... excavation bit, 4B ... crushing bit as internal crushing means, 4C ... crushing bit as connecting part crushing means, 4D ... crushing bit as external crushing means, 5 ... model steel pipe pile, 6 ... inner soil, 7 ... cradle, G ... ground, G4 ... support layer.

Claims (16)

杭の施工に際して地盤を掘削する杭施工用掘削装置であって、
先端に掘削用ビットを有して回転駆動される外側管と、この外側管の内部に設けられかつ先端に掘削用ビットを有して回転駆動される内側管と、前記外側管の内部かつ前記内側管の上方に設けられて掘削土を地上に排出する排出手段とを備えて構成され、
前記内側管は、当該内側管の内部の土を粉砕する内部粉砕手段を有して構成されていることを特徴とする杭施工用掘削装置。
A pile construction excavator for excavating the ground when constructing a pile,
An outer tube having a drilling bit at the tip and being driven to rotate; an inner tube provided inside the outer tube and having a drilling bit at the tip and being driven to rotate; and the inside of the outer tube and the And a discharge means provided above the inner pipe and discharging the excavated soil to the ground,
The excavation apparatus for pile construction characterized in that the inner pipe has an internal crushing means for crushing the soil inside the inner pipe.
請求項1に記載の杭施工用掘削装置において、
前記内部粉砕手段は、前記内側管の内周面に設けられた少なくとも1つのビットを有して構成されていることを特徴とする杭施工用掘削装置。
In the pile construction excavation device according to claim 1,
The pile digging apparatus according to claim 1, wherein the internal crushing means includes at least one bit provided on an inner peripheral surface of the inner pipe.
請求項2に記載の杭施工用掘削装置において、
前記内側管の内周面のビットは、当該内周面において周方向に複数並べられた少なくとも一段のビット列、または前記内周面において螺旋状に複数並べられた螺旋ビット列のいずれかの列状に構成されていることを特徴とする杭施工用掘削装置。
In the excavation apparatus for pile construction according to claim 2,
Bits on the inner peripheral surface of the inner tube are in the form of either at least one bit row arranged in the circumferential direction on the inner peripheral surface or a spiral bit sequence arranged in a plurality of spirals on the inner peripheral surface. Excavator for pile construction characterized by being configured.
請求項1から請求項3のいずれかに記載の杭施工用掘削装置において、
前記内側管は、当該内側管の上部に連結されて当該内側管を回転支持する連結部と、この連結部に設けられた連結部粉砕手段とを有して構成されていることを特徴とする杭施工用掘削装置。
In the pile construction excavation device according to any one of claims 1 to 3,
The inner tube is configured to include a connecting portion that is connected to an upper portion of the inner tube and rotationally supports the inner tube, and a connecting portion crushing means provided in the connecting portion. Drilling equipment for pile construction.
請求項1から請求項4のいずれかに記載の杭施工用掘削装置において、
前記内側管は、当該内側管と前記外側管との間の土を粉砕する外部粉砕手段を有して構成され、
前記外部粉砕手段は、前記内側管の外周面に設けられた少なくとも1つのビットを有して構成されていることを特徴とする杭施工用掘削装置。
In the excavation apparatus for pile construction according to any one of claims 1 to 4,
The inner pipe is configured to have external crushing means for crushing the soil between the inner pipe and the outer pipe,
The pile digging apparatus characterized in that the external crushing means has at least one bit provided on the outer peripheral surface of the inner pipe.
請求項5に記載の杭施工用掘削装置において、
前記内側管の外周面のビットは、当該外周面において周方向に複数並べられた少なくとも一段のビット列、または前記外周面において螺旋状に複数並べられた螺旋ビット列のいずれかの列状に構成されていることを特徴とする杭施工用掘削装置。
In the excavation apparatus for pile construction according to claim 5,
The bits on the outer peripheral surface of the inner tube are configured in a row form of at least one bit row arranged in the circumferential direction on the outer peripheral surface or a spiral bit row arranged in a plurality of spirals on the outer peripheral surface. Excavator for pile construction, characterized by
請求項1から請求項6のいずれかに記載の杭施工用掘削装置において、
前記外側管の内周面には、前記内側管との間の土を粉砕する少なくとも1つのビットが設けられ、
前記外側管の内周面のビットは、当該内周面において周方向に複数並べられた少なくとも一段のビット列、または前記内周面において螺旋状に複数並べられた螺旋ビット列のいずれかの列状に構成されていることを特徴とする杭施工用掘削装置。
In the pile construction excavation apparatus according to any one of claims 1 to 6,
At least one bit for pulverizing soil between the inner pipe and the inner peripheral surface of the outer pipe is provided,
The bit on the inner peripheral surface of the outer tube is in the form of either a plurality of bit rows arranged in the circumferential direction on the inner peripheral surface, or a spiral bit sequence arranged in a plurality of spirals on the inner peripheral surface. Excavator for pile construction characterized by being configured.
請求項1から請求項7のいずれかに記載の杭施工用掘削装置において、
前記外側管および前記内側管を回転駆動する1つの共通駆動部、または前記外側管と前記内側管とをそれぞれ独立して回転駆動する外側管用駆動部および内側管用駆動部、のいずれかを備え、
前記外側管と前記内側管とは、前記1つの駆動部または前記複数の駆動部によって、互いに同一方向または逆方向の独立した方向に回転駆動されることを特徴とする杭施工用掘削装置。
In the excavation apparatus for pile construction according to any one of claims 1 to 7,
One of the common drive unit that rotationally drives the outer tube and the inner tube, or the outer tube drive unit and the inner tube drive unit that independently rotate and drive the outer tube and the inner tube,
The excavation apparatus for pile construction, wherein the outer tube and the inner tube are rotationally driven in the same direction or independent directions by the one driving unit or the plurality of driving units.
請求項8に記載の杭施工用掘削装置において、
前記排出手段は、前記内側管と前記共通駆動部または前記内側管用駆動部とを連結するロッドの外周に設けたスクリューの回転で掘削土を上方に搬送するスクリュー装置、前記ロッドの内部を通して掘削土を吸い上げるエアリフト装置、前記外側管の内部に供給した水とともに前記ロッドの内部を通して掘削土を吸い上げる泥水リフト装置のいずれかで構成されていることを特徴とする杭施工用掘削装置。
The excavation apparatus for pile construction according to claim 8,
The discharging means includes a screw device that conveys excavated soil upward by rotation of a screw provided on an outer periphery of a rod that connects the inner tube and the common drive unit or the inner tube drive unit, and excavated soil through the inside of the rod. A pile construction drilling device comprising: an air lift device for sucking up excavation soil and a mud lift device for sucking up excavated soil through the inside of the rod together with water supplied to the inside of the outer pipe.
請求項1から請求項9のいずれかに記載の杭施工用掘削装置を用いて掘削した地盤に杭を構築する杭の施工方法であって、
前記杭施工用掘削装置を構成する外側管および内側管で地盤を掘削するとともに、当該内側管の内部の土を内部粉砕手段で粉砕し、粉砕した土を排出手段で地上に排出することを特徴とする杭の施工方法。
A pile construction method for constructing a pile on the ground excavated using the excavation apparatus for pile construction according to any one of claims 1 to 9,
The ground is excavated by the outer pipe and the inner pipe constituting the excavation apparatus for pile construction, the soil inside the inner pipe is crushed by the internal crushing means, and the crushed soil is discharged to the ground by the discharging means. Pile construction method.
請求項10に記載の杭の施工方法において、
前記杭施工用掘削装置は、前記外側管および前記内側管を回転駆動する1つの共通駆動部、または前記外側管と前記内側管とをそれぞれ独立して回転駆動する外側管用駆動部および内側管用駆動部、のいずれかを備え、
前記1つの駆動部または前記複数の駆動部によって、前記外側管と前記内側管とを互いに同一方向に回転駆動して地盤を掘削するか、または前記外側管と前記内側管とを互いに逆方向に回転駆動して地盤を掘削することを特徴とする杭の施工方法。
In the construction method of the pile of Claim 10,
The pile construction excavator includes a common drive unit that rotationally drives the outer tube and the inner tube, or an outer tube drive unit and an inner tube drive that independently rotate and drive the outer tube and the inner tube, respectively. Department,
The outer tube and the inner tube are driven to rotate in the same direction by the one driving unit or the plurality of driving units to excavate the ground, or the outer tube and the inner tube are reversed to each other. A pile construction method characterized by excavating the ground by rotating.
請求項11に記載の杭の施工方法において、
前記外側管が前記杭を構成する鋼管杭で構成され、当該外側管を地盤の支持層に貫入させた後に前記共通駆動部または前記外側管用駆動部との連結を解除することを特徴とする杭の施工方法。
In the construction method of the pile of Claim 11,
Pile characterized in that the outer pipe is composed of a steel pipe pile constituting the pile, and the connection with the common drive part or the outer pipe drive part is released after the outer pipe penetrates into the support layer of the ground. Construction method.
請求項12に記載の杭の施工方法において、
前記内側管による掘削を前記支持層よりも上方で停止し、前記支持層上面から前記外側管の外径寸法以上の深さを当該外側管で掘削して支持層に貫入させることを特徴とする杭の施工方法。
In the construction method of the pile of Claim 12,
The excavation by the inner pipe is stopped above the support layer, and a depth equal to or larger than the outer diameter of the outer pipe is excavated from the upper surface of the support layer by the outer pipe and penetrated into the support layer. Pile construction method.
請求項12または請求項13に記載の杭の施工方法において、
前記外側管の前記支持層への貫入寸法が当該外側管の外径寸法の2倍から5倍の範囲に設定されていることを特徴とする杭の施工方法。
In the construction method of the pile according to claim 12 or claim 13,
The method for constructing a pile, wherein a penetration dimension of the outer pipe into the support layer is set in a range of 2 to 5 times an outer diameter dimension of the outer pipe.
請求項12から請求項14のいずれかに記載の杭の施工方法において、
前記外側管の掘削完了以前に前記排出手段による掘削土の排出を停止し、前記外側管の先端内部に当該外側管の外径寸法の3倍以上の深さの土を残留させることを特徴とする杭の施工方法。
In the construction method of the pile in any one of Claims 12-14,
Before the completion of excavation of the outer pipe, discharging of the excavated soil by the discharging means is stopped, and soil having a depth of three times or more of the outer diameter of the outer pipe is left inside the tip of the outer pipe. Pile construction method.
請求項10または請求項11に記載の杭の施工方法において、
前記杭施工用掘削装置を用いて掘削した後に掘削孔から前記外側管および内側管を抜き、前記掘削孔にコンクリートを打設して場所打ち杭を造成するか、または前記掘削孔に既成コンクリート杭あるいは鋼管杭を埋設して埋め込み杭を構築することを特徴とする杭の施工方法。
In the construction method of the pile according to claim 10 or claim 11,
After excavating using the excavator for pile construction, the outer pipe and the inner pipe are pulled out from the excavation hole, and a cast-in-place pile is formed by placing concrete in the excavation hole, or an existing concrete pile in the excavation hole Or the construction method of a pile characterized by embedding a steel pipe pile and constructing an embedded pile.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107780408A (en) * 2017-09-19 2018-03-09 温州天泽建设有限公司 Concrete tubular pile device and its construction method

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2295645B1 (en) * 2009-08-28 2012-05-16 BAUER Maschinen GmbH Drilling apparatus and method of making piles in a soil
JP6148499B2 (en) * 2013-03-01 2017-06-14 五洋建設株式会社 Steel pipe sheet pile press-fitting device
JP6073175B2 (en) * 2013-04-15 2017-02-01 新日鉄住金エンジニアリング株式会社 How to install drain pipe
JP6644380B2 (en) * 2015-12-16 2020-02-12 六郎 海野 Foundation pile
WO2020184282A1 (en) * 2019-03-08 2020-09-17 日本製鉄株式会社 Steel pipe pile and method for installing steel pipe pile
WO2020184283A1 (en) * 2019-03-08 2020-09-17 日本製鉄株式会社 Steel pipe pile and method for installing steel pipe pile
CN116733367B (en) * 2023-08-15 2023-12-12 中启胶建集团有限公司 Excavation pile driving equipment for land measurement and positioning

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5364902A (en) * 1976-11-24 1978-06-09 Sanwa Kizai Co Ltd Auger type excavator
JPS5748019A (en) * 1980-09-01 1982-03-19 Takechi Koumushiyo:Kk Pile including steel pipe pile
JPS58123998A (en) * 1982-01-18 1983-07-23 株式会社松沢基工 Method of construction of excavation of large-bore pit
JP2839074B2 (en) * 1994-05-13 1998-12-16 鹿島建設株式会社 Underground obstacle cutting device
JPH08303172A (en) * 1995-04-28 1996-11-19 Mitsubishi Heavy Ind Ltd Hollow excavator for boring machine
JP3466359B2 (en) * 1996-02-05 2003-11-10 日立建機株式会社 Core recovery method and core recovery device for all casing method
JPH10131657A (en) * 1996-10-25 1998-05-19 Mitsubishi Constr Co Ltd Deep ground improving device for underground obstacle, rock-bed, boulder and the like
JP3084360B2 (en) * 1997-05-16 2000-09-04 丸五基礎工業株式会社 Underground obstacle removal method and device
JP3052195B2 (en) * 1997-06-02 2000-06-12 東洋ロックソイル株式会社 Drilling method and equipment for large diameter pits
JP3422742B2 (en) * 2000-02-02 2003-06-30 日本車輌製造株式会社 Drilling rig

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107780408A (en) * 2017-09-19 2018-03-09 温州天泽建设有限公司 Concrete tubular pile device and its construction method
CN107780408B (en) * 2017-09-19 2019-08-20 温州天泽建设有限公司 Concrete tubular pile device and its construction method

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