JP6576196B2 - Hydraulic cylinder expansion head - Google Patents

Hydraulic cylinder expansion head Download PDF

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JP6576196B2
JP6576196B2 JP2015195738A JP2015195738A JP6576196B2 JP 6576196 B2 JP6576196 B2 JP 6576196B2 JP 2015195738 A JP2015195738 A JP 2015195738A JP 2015195738 A JP2015195738 A JP 2015195738A JP 6576196 B2 JP6576196 B2 JP 6576196B2
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expansion
blade
link arm
head
hydraulic cylinder
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JP2017066807A (en
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良典 松井
良典 松井
雄大 高田
雄大 高田
伊佐夫 山本
伊佐夫 山本
三村　哲弘
哲弘 三村
敏男 田中
敏男 田中
和博 鹿島
和博 鹿島
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JFE Steel Corp
Sanwa Kizai Co Ltd
Japan Pile Corp
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JFE Steel Corp
Sanwa Kizai Co Ltd
Japan Pile Corp
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Description

本発明は、既製杭等の杭の地中中間部あるいは下端に球根を造成するための拡大掘削ヘッドに係るものである。   The present invention relates to an enlarged excavation head for creating a bulb in the middle or lower end of a pile such as a ready-made pile.

従来、下端に掘削刃を有するヘッドロッドに拡大翼の基部を回動自在に取付け、拡大翼を油圧シリンダにより格納位置と拡開位置との間回動するように構成し、油圧シリンダの駆動をリンク機構のリンクアームにより伝達して回動させる構成は、公知である（特許文献１）。   Conventionally, the base of the expansion blade is pivotally attached to a head rod having a drilling blade at the lower end, and the expansion blade is configured to be rotated between a retracted position and an expanded position by a hydraulic cylinder to drive the hydraulic cylinder. A configuration that is transmitted and rotated by a link arm of a link mechanism is known (Patent Document 1).

特開２００８−４５３５０号公報JP 2008-45350 A

前記公知例は、拡開状態の拡大翼が格納位置に回動する際に、リンク機構のリンクアームと拡大翼とは取付軸を中心に互いに鋏の刃先のように、閉じる方向に回動し、リンクアームと拡大翼との間に掘削土砂を噛み込み、拡大翼を格納できずに、ヘッドロッドの引き上げ不能状態となるという課題がある。
本願は、拡大翼およびリンク機構の構成を工夫し、掘削土砂を噛み込みを防止すると共に、拡大翼の回転抵抗を低減し、撹拌性能の向上を図ったものである。 In the known example, when the expanded wing in the expanded state is rotated to the retracted position, the link arm and the wing of the link mechanism are rotated in the closing direction around the mounting shaft like the blade edge of a hook. There is a problem that the excavated earth and sand is caught between the link arm and the enlarged wing, and the enlarged wing cannot be stored and the head rod cannot be lifted.
In the present application, the configuration of the expansion blade and the link mechanism is devised to prevent biting of excavated earth and sand, and the rotational resistance of the expansion blade is reduced to improve the stirring performance.

請求項１の発明は、下端に設けた掘削ヘッド２の上方所定位置のヘッドロッド１の外周に、ヘッドロッド１側に閉翼する格納位置から前記掘削ヘッド２の掘削径より大径の拡開位置へ回動する複数の拡大翼５を設け、該拡大翼５は前記ヘッドロッド１内に設けた単独の油圧シリンダ１７による移動体１５のヘッドロッド１軸心方向の伸縮移動をリンク機構１０のリンクアーム１１により伝達して格納位置と拡開位置との間回動するとすると共に、リンクアーム１１の基部は基部側軸１６により油圧シリンダ１７によりヘッドロッド１に対して軸方向に移動する移動体１５に取付け、基部側軸１６は、拡大翼５の格納状態において、拡大翼５をヘッドロッド１に回動自在に取付けた支点軸６と略同一高さ、または、上方に配置構成した油圧シリンダ式拡大ヘッドとしたものである。
請求項２の発明は、前記拡大翼５とリンクアーム１１とは、拡大翼５の拡開状態において、拡大翼５の下縁２２はリンクアーム１１と重なり、リンクアーム１１の上縁２３は拡大翼５と重なる構成とした油圧シリンダ式拡大ヘッドとしたものである。
請求項３の発明は、前記リンク機構１０は、拡大翼５が拡開位置と格納位置との間回動する際に、リンク機構１０のリンクアーム１１が拡大翼５と同方向に回動する構成とした油圧シリンダ式拡大ヘッドとしたものである。
請求項４の発明は、前記拡大翼５の基部は支点軸６によりヘッドロッド１側に回動自在に取付け、前記リンク機構１０のリンクアーム１１の一端は拡大翼５へ先端側軸１２により取付け、リンクアーム１１の他端は油圧シリンダ１７により移動する移動体１５に基部側軸１６により取付け、前記拡大翼５の支点軸６と、前記リンクアーム１１の先端側軸１２および基部側軸１６とは、拡大翼５の閉翼状態で、リンク機構１０の基部側軸１６、拡大翼５の支点軸６、リンク機構１０の先端側軸１２の順に上から配置した油圧シリンダ式拡大ヘッドとしたものである。 According to the first aspect of the present invention, the outer diameter of the head rod 1 at a predetermined position above the excavation head 2 provided at the lower end is expanded larger than the excavation diameter of the excavation head 2 from the retracted position where the blade is closed on the head rod 1 side A plurality of expanding blades 5 that rotate to a position are provided, and the expanding blades 5 extend and retract the movable body 15 in the axial direction of the head rod 1 by a single hydraulic cylinder 17 provided in the head rod 1. A movable body that is transmitted by the link arm 11 and rotates between the retracted position and the expanded position, and the base portion of the link arm 11 is moved in the axial direction relative to the head rod 1 by the hydraulic cylinder 17 by the base side shaft 16. attached to 15, proximal shaft 16, in a storage state of the expansion blades 5, the pivot shaft 6 and substantially the same height mounted rotatably expansion blades 5 in the head rod 1, or, hydraulic Siri disposed constructed over It is obtained by the Da-type enlarged head.
According to the second aspect of the present invention, when the expansion blade 5 and the link arm 11 are in the expanded state, the lower edge 22 of the expansion blade 5 overlaps the link arm 11 and the upper edge 23 of the link arm 11 is expanded. This is a hydraulic cylinder type expansion head configured to overlap with the blade 5 .
According to a third aspect of the present invention, the link mechanism 10 is configured such that the link arm 11 of the link mechanism 10 rotates in the same direction as the expanding blade 5 when the expanding blade 5 rotates between the expanded position and the retracted position. The hydraulic cylinder type expansion head is configured.
According to a fourth aspect of the present invention, the base of the expansion wing 5 is rotatably attached to the head rod 1 side by the fulcrum shaft 6, and one end of the link arm 11 of the link mechanism 10 is attached to the expansion wing 5 by the front end side shaft 12. The other end of the link arm 11 is attached to a moving body 15 that is moved by a hydraulic cylinder 17 by a base side shaft 16, and the fulcrum shaft 6 of the expansion wing 5, the tip side shaft 12 and the base side shaft 16 of the link arm 11 Is a hydraulic cylinder type expansion head arranged in the order of the base side shaft 16 of the link mechanism 10, the fulcrum shaft 6 of the expansion blade 5, and the tip side shaft 12 of the link mechanism 10 in the closed state of the expansion blade 5. It is.

請求項１の発明では、リンクアーム１１の基部側軸１６を拡大翼５をヘッドロッド１に回動自在に取付けた支点軸６より拡大翼５の格納状態において同一高さまたは上方に配置構成しているので、リンクアーム１１と拡大翼５との両者間の隙間をなくせて、噛み込みを防止でき、また、回転投影面積を小さくして回転抵抗を小さくでき、固化液と掘削土砂との撹拌性能を向上させることができる。
請求項２の発明では、拡大翼５の下縁２２はリンクアーム１１と重なり、リンクアーム１１の上縁２３が拡大翼５と重なっているので、一層、リンクアーム１１と拡大翼５との両者間の隙間をなくせて、噛み込みを防止でき、また、一層、回転投影面積を小さくして回転抵抗を小さくでき、固化液と掘削土砂との撹拌性能も向上させることができる。
請求項３の発明では、拡大翼５の回動する際に、リンク機構１０のリンクアーム１１は拡大翼５と同方向に回動するので、拡大翼５とリンクアーム１１との間の掘削土砂の噛み込みを防止できる。
請求項４の発明では、リンクアーム１１の先端側軸１２および基部側軸１６とを、リンク機構１０の基部側軸１６、拡大翼５の支点軸６、リンク機構１０の先端側軸１２の順に上から配置しているので、拡大翼５とリンクアーム１１とを同方向に回動させることができ、拡大翼５とリンクアーム１１との間の掘削土砂の噛み込みを防止でき、また、拡大翼５とリンクアーム１１との両者間に隙間がないように重ねることができ、この点でも、噛み込みを防止でき、また、拡大翼５とリンクアーム１１とが重なるので、掘削時の拡大翼５とリンクアーム１１の回転投影面積を小さくできて回転抵抗を小さくでき、これにより、掘削土砂が塊で動くことを抑制でき、固化液と掘削土砂との撹拌性能を向上させることができる。 In the first aspect of the present invention, the base side shaft 16 of the link arm 11 is arranged at the same height or above the fulcrum shaft 6 in which the enlarged blade 5 is rotatably attached to the head rod 1 in the retracted state of the enlarged blade 5. Therefore, the gap between the link arm 11 and the expanding blade 5 can be eliminated to prevent biting, and the rotational projection area can be reduced to reduce the rotational resistance, so that the solidified liquid and the excavated earth and sand can be agitated. Performance can be improved .
In the invention of claim 2, since the lower edge 22 of the expansion wing 5 overlaps with the link arm 11 and the upper edge 23 of the link arm 11 overlaps with the expansion wing 5, both the link arm 11 and the expansion wing 5 further. The gap between them can be eliminated to prevent biting, and the rotational projection area can be further reduced to reduce the rotational resistance, and the stirring performance of the solidified liquid and the excavated earth and sand can be improved .
In the invention of claim 3, since the link arm 11 of the link mechanism 10 rotates in the same direction as the expansion blade 5 when the expansion blade 5 rotates, excavated earth and sand between the expansion blade 5 and the link arm 11. Can be prevented .
In the invention of claim 4, the tip side shaft 12 and the base side shaft 16 of the link arm 11 are arranged in the order of the base side shaft 16 of the link mechanism 10, the fulcrum shaft 6 of the expanding blade 5, and the tip side shaft 12 of the link mechanism 10. Since it arranges from the top, the expansion wing 5 and the link arm 11 can be rotated in the same direction, and the biting of excavated earth and sand between the expansion wing 5 and the link arm 11 can be prevented. The blades 5 and the link arm 11 can be overlapped so that there is no gap between them. In this respect as well, the biting can be prevented, and the enlarged blade 5 and the link arm 11 overlap each other. 5 and the rotation projection area of the link arm 11 can be reduced, and the rotation resistance can be reduced, whereby the excavated earth and sand can be prevented from moving in a lump, and the stirring performance of the solidified liquid and the excavated earth and sand can be improved.

拡大翼の格納状態の拡大ヘッドの側面図。The side view of the expansion head of the expansion state of the expansion wing. 拡大翼の拡開状態の拡大ヘッドの側面図。The side view of the expansion head of the expansion state of an expansion blade. 拡大翼の拡開状態の拡大ヘッドの縦断側面図。The longitudinal side view of the expansion head of the expansion state of an expansion blade. 拡大翼の拡開状態および格納状態の拡大ヘッドの縦断側面図。The longitudinal side view of the expansion head of the expansion state of an expansion wing | wing and a retracted state. 拡大ヘッドの正面図。The front view of an expansion head.

本発明の一実施形態を図面により説明すると、１は拡大ヘッドのヘッドロッドであり、ヘッドロッド１の下端には掘削ヘッド２を設ける。掘削ヘッド２は地盤に縦坑を形成するものであり、ヘッドロッド１の径より大径に形成している。掘削ヘッド２の形状は本願の要件ではなく、任意形状のものでよい。
掘削ヘッド２より上方の所定位置のヘッドロッド１には、縦長で側面が平坦な一対の取付部３を設け、各取付部３の前後面にはブラケット４を夫々設け、各ブラケット４には一対の拡大翼５を支点軸６によりヘッドロッド１と略平行の格納位置と掘削ヘッド２の掘削径よりも先端が外側に開いた拡開位置との間回動自在に取付ける。 An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a head rod of an enlargement head, and an excavation head 2 is provided at the lower end of the head rod 1. The excavation head 2 forms a vertical shaft in the ground, and has a diameter larger than that of the head rod 1. The shape of the excavation head 2 is not a requirement of the present application, and may be an arbitrary shape.
The head rod 1 at a predetermined position above the excavation head 2 is provided with a pair of vertically long and flat side attachment portions 3, brackets 4 are provided on the front and rear surfaces of each attachment portion 3, and each bracket 4 is provided with a pair. The expansion wing 5 is attached to a fulcrum shaft 6 so as to be rotatable between a retracted position substantially parallel to the head rod 1 and an expanded position where the tip of the excavation head 2 is opened outward from the excavation diameter.

拡大翼５の格納時の、拡大翼５の長さ方向において基部と先端との間の任意位置には、リンク機構１０のリンクアーム１１の先端を先端側軸１２により取付ける。本例では拡大翼５の格納時の上下略中間位置にリンクアーム１１の先端を取付けている。リンクアーム１１の基部はヘッドロッド１に上下移動自在に設けた移動体１５に基部側軸１６により取付ける。
ヘッドロッド１の前記取付部３間には左右方向に貫通して空間を形成する中間開口部７を設け、中間開口部７内に移動体１５を上下動自在に挿入する。 The distal end of the link arm 11 of the link mechanism 10 is attached by the distal end side shaft 12 at an arbitrary position between the base and the distal end in the length direction of the enlarged wing 5 when the enlarged wing 5 is retracted. In this example, the tip end of the link arm 11 is attached to a substantially middle position in the vertical direction when the expansion blade 5 is retracted. A base portion of the link arm 11 is attached to a moving body 15 provided on the head rod 1 so as to be movable up and down by a base side shaft 16.
An intermediate opening 7 that penetrates in the left-right direction to form a space is provided between the mounting portions 3 of the head rod 1, and the moving body 15 is inserted into the intermediate opening 7 so as to be movable up and down.

移動体１５には、ヘッドロッド１内に設けた油圧シリンダ１７のピストンロッド１８の中間部を取付ける。ピストンロッド１８は、その上端にピストン１９を一体状に設け、ピストンロッド１８の中間部は中間開口部７内を上下に貫通し、ピストンロッド１８の下端はピストンロッド１８内の軸心に設けた縦穴１８Ａ内に挿入する。縦穴１８Ａは、ピストン１９の上下ストロークより長く形成する。
なお、移動体１５はピストンロッド１８の伸縮により一体上下すればよく、移動体１５とピストンロッド１８との取付構成は任意である。
前記ピストン１９は油圧シリンダ１７のシリンダチューブ２０内に摺動自在に挿入する。 An intermediate portion of the piston rod 18 of the hydraulic cylinder 17 provided in the head rod 1 is attached to the moving body 15. The piston rod 18 is integrally provided with a piston 19 at the upper end thereof, the intermediate portion of the piston rod 18 penetrates the intermediate opening 7 vertically, and the lower end of the piston rod 18 is provided at the axial center in the piston rod 18. Insert into the vertical hole 18A. The vertical hole 18 </ b> A is formed longer than the vertical stroke of the piston 19.
The moving body 15 may be moved up and down integrally by expansion and contraction of the piston rod 18, and the mounting structure of the moving body 15 and the piston rod 18 is arbitrary.
The piston 19 is slidably inserted into the cylinder tube 20 of the hydraulic cylinder 17.

前記リンク機構１０は、拡大翼５の拡開位置と格納位置との間の回動する際に、リンク機構１０のリンクアーム１１が拡大翼５と同方向に回動するように構成する。
即ち、拡大翼５は格納位置から拡開するときには、支点軸６中心に上方回動し、リンクアーム１１も同様に基部側軸１６中心に上方回動するように、拡大翼５の支点軸６と、リンクアーム１１の先端側軸１２および基部側軸１６を配置する。
そのため、拡大翼５が拡開位置から格納位置に戻るとき、拡大翼５とリンクアーム１１とが互いに交差することが無く、拡大翼５とリンクアーム１１の間に礫等を挟み込むのを防止する。 The link mechanism 10 is configured such that the link arm 11 of the link mechanism 10 rotates in the same direction as the expanding blade 5 when rotating between the expanded position and the retracted position of the expanding blade 5.
That is, when the expansion blade 5 is expanded from the retracted position, the fulcrum shaft 6 of the expansion blade 5 is rotated so that the fulcrum shaft 6 is rotated upward about the fulcrum shaft 6 and the link arm 11 is similarly rotated upwardly about the base side shaft 16. Then, the distal end side shaft 12 and the base portion side shaft 16 of the link arm 11 are arranged.
Therefore, when the expanding blade 5 returns from the expanded position to the retracted position, the expanding blade 5 and the link arm 11 do not cross each other, and it is possible to prevent gravel and the like from being sandwiched between the expanding blade 5 and the link arm 11. .

リンクアーム１１は拡大翼５の左右幅より薄い板部材により形成し、拡大翼５の側面側に先端側軸１２により取付ける。
そのため、拡大翼５とリンクアーム１１は平面視において重ならないが、拡大翼５とリンクアーム１１とは、拡大翼５を回動させる際に、拡大翼５とリンクアーム１１とが側面視において一部が互いに重なるように構成する。
即ち、拡大翼５の拡開状態において、拡大翼５の下縁２２はリンクアーム１１と重なり、リンクアーム１１の上縁２３は拡大翼５と重なるように構成し、拡大翼５とリンクアーム１１とは格納位置でも重なる構成とする。
そのため、拡大翼５とリンクアーム１１の間に隙間が生じるのを防止し、拡大翼５とリンクアーム１１の間に異物が挟まるのを防止する。
なお、本例では、リンクアーム１１を一対とし、各リンクアーム１１を拡大翼５の両側面にそれぞれ先端側軸１２により取付けている。 The link arm 11 is formed by a plate member that is thinner than the left and right widths of the expansion blade 5, and is attached to the side surface side of the expansion blade 5 by the tip side shaft 12.
For this reason, the enlarged wing 5 and the link arm 11 do not overlap in plan view. However, the enlarged wing 5 and the link arm 11 are identical in side view when the enlarged wing 5 is rotated. The parts are configured to overlap each other.
That is, in the expanded state of the expanding blade 5, the lower edge 22 of the expanding blade 5 overlaps with the link arm 11, and the upper edge 23 of the link arm 11 overlaps with the expanding blade 5. Is configured to overlap at the storage position.
Therefore, it is possible to prevent a gap from being generated between the expanding blade 5 and the link arm 11 and prevent foreign matter from being caught between the expanding blade 5 and the link arm 11.
In this example, the link arms 11 are paired, and each link arm 11 is attached to both side surfaces of the enlarged blade 5 by the tip end side shaft 12.

拡大翼５の支点軸６と、リンクアーム１１の先端側軸１２および基部側軸１６の具体的配置は、閉翼状態において、リンク機構１０の一端の拡大翼５への取付位置は拡大翼５の長さ方向の中間位置とし、リンク機構１０の他端の油圧シリンダ１７側となる移動体１５への取付位置は、拡大翼５の支点軸６に対しての拡大翼５のリンクアーム１１の取付位置とは反対の位置とする。
即ち、閉翼状態で、拡大翼５の支点軸６が、リンク機構１０の先端側軸１２と基部側軸１６との上下間に位置するように配置する。 The specific arrangement of the fulcrum shaft 6 of the expansion blade 5 and the tip side shaft 12 and the base side shaft 16 of the link arm 11 is such that, in the closed state, the attachment position of one end of the link mechanism 10 to the expansion blade 5 is The attachment position of the other end of the link mechanism 10 to the moving body 15 on the hydraulic cylinder 17 side is the position of the link arm 11 of the expansion blade 5 with respect to the fulcrum shaft 6 of the expansion blade 5. The position is opposite to the mounting position.
In other words, in a closed state, the fulcrum shaft 6 of the expansion blade 5 is disposed so as to be positioned between the top side shaft 12 and the base side shaft 16 of the link mechanism 10.

換言すると、閉翼状態では、リンク機構１０の基部側軸１６は拡大翼５の支点軸６より上方に位置させ、リンク機構１０の先端側軸１２は拡大翼５の支点軸６より下方に位置させ、上から、リンク機構１０の基部側軸１６、拡大翼５の支点軸６、リンク機構１０の先端側軸１２の順に配置し、基部側軸１６が下動することにより、拡大翼５およびリンクアーム１１は何れも上方回動して拡開する構成とする。
前記ピストン１９およびピストンロッド１８の内側には軸心方向の全長に亘って縦孔２５を有するセメントミルク等の固化液供給管２６を挿通し、ピストン１９およびピストンロッド１８は固化液供給管２６に対して摺動自在となる。固化液供給管２６の下端部は、ピストンロッド１８の下端から下方へ突出させ、突出端部を掘削ヘッド２の吐出口２７に接続する。 In other words, in the closed blade state, the base side shaft 16 of the link mechanism 10 is positioned above the fulcrum shaft 6 of the expansion blade 5, and the tip side shaft 12 of the link mechanism 10 is positioned below the fulcrum shaft 6 of the expansion blade 5. From the top, the base side shaft 16 of the link mechanism 10, the fulcrum shaft 6 of the expansion blade 5, and the tip side shaft 12 of the link mechanism 10 are arranged in this order, and the base side shaft 16 moves downward, Each of the link arms 11 is configured to rotate upward and expand.
Inside the piston 19 and the piston rod 18, a solidified liquid supply pipe 26 such as cement milk having a vertical hole 25 is inserted over the entire length in the axial direction, and the piston 19 and the piston rod 18 are inserted into the solidified liquid supply pipe 26. On the other hand, it becomes slidable. The lower end portion of the solidified liquid supply pipe 26 protrudes downward from the lower end of the piston rod 18, and the protruding end portion is connected to the discharge port 27 of the excavation head 2.

図中、２８は圧力油供給二重管であり、圧力油供給二重管２８の下端部から分岐した一方の圧力油供給路２９をシリンダチューブ２０内の縮側スペース３０に、他方の圧力油供給路３１をシリンダチューブ２０内の伸側スペース３２にそれぞれ接続する。
３３はヘッドロッド１の上部に設けた雄継手、３４は拡大翼５の先端の掘削ビット、３５は掘削ヘッド２の掘削ビットである。 In the figure, 28 is a pressure oil supply double pipe, and one pressure oil supply path 29 branched from the lower end of the pressure oil supply double pipe 28 is connected to the compression side space 30 in the cylinder tube 20 and the other pressure oil is supplied. The supply path 31 is connected to the extending side space 32 in the cylinder tube 20.
33 is a male joint provided on the upper part of the head rod 1, 34 is a drill bit at the tip of the enlarged wing 5, and 35 is a drill bit of the drill head 2.

（実施形態の作用）
本発明は、上記の構成であり、拡大翼５を閉翼した状態で、ヘッドロッド１を回転させて掘削ヘッド２により地盤を掘削して、所定深さの縦坑を掘削する。
次に、油圧シリンダ１７のシリンダチューブ２０の伸側スペース３２に送油してピストン１９を下降させ、ピストン１９の下降によりピストンロッド１８が下降し、ピストンロッド１８は移動体１５を下降させ、移動体１５は基部側軸１６を下降させ、これにより、リンク機構１０のリンクアーム１１は基部側軸１６中心に上方回動し、拡大翼５を拡開させて拡大掘削を行って拡大孔を掘削し、この拡大孔に固化液供給管２６によるセメントミルクを吐出口２７から吐出注入し、掘削土砂とセメントミルクとを撹拌混合して拡大球根を造成する。 (Operation of the embodiment)
The present invention is configured as described above, and with the expansion blade 5 closed, the head rod 1 is rotated and the ground is excavated by the excavation head 2 to excavate a vertical shaft having a predetermined depth.
Next, oil is supplied to the extension side space 32 of the cylinder tube 20 of the hydraulic cylinder 17 to lower the piston 19, and when the piston 19 descends, the piston rod 18 descends, and the piston rod 18 lowers the moving body 15 to move. The body 15 lowers the base side shaft 16, whereby the link arm 11 of the link mechanism 10 pivots upward about the base side shaft 16, widens the expansion blade 5, and performs expansion excavation to excavate the expansion hole. Then, cement milk from the solidified liquid supply pipe 26 is discharged and injected into the enlarged hole from the discharge port 27, and the excavated earth and cement milk are stirred and mixed to form an enlarged bulb.

拡大翼５を拡翼位置と閉翼位置とに回動させるリンク機構１０は、閉翼状態において、リンク機構１０のリンクアーム１１の一端の拡大翼５への取付位置を拡大翼５の長さ方向の中間位置とし、リンク機構１０のリンクアーム１１の他端の油圧シリンダ１７側となる移動体１５への取付位置を、拡大翼５の支点軸６に対しての拡大翼５のリンクアーム１１の取付位置とは反対の位置としているので、拡大翼５が拡開位置から閉翼位置へ回動する際、拡大翼５とヘッドロッド１との間にリンク機構１０のリンクアーム１１が存在せず、拡大翼５とリンクアーム１１との間に掘削土砂の噛み込みを防止する。
そのため、拡大翼５を格納できずに、ヘッドロッド１の引き上げ不能状態となるのを防止する。 The link mechanism 10 that rotates the expansion blade 5 between the blade expansion position and the blade closing position is the length of the expansion blade 5 when the link arm 10 is attached to the expansion blade 5 at one end of the link arm 11 in the closed blade state. The link arm 11 of the expansion blade 5 with respect to the fulcrum shaft 6 of the expansion blade 5 is set to the intermediate position in the direction, and the attachment position of the other end of the link arm 11 of the link mechanism 10 to the moving body 15 on the hydraulic cylinder 17 side. The link arm 11 of the link mechanism 10 does not exist between the enlarged blade 5 and the head rod 1 when the enlarged blade 5 is rotated from the expanded position to the closed blade position. First, the excavated earth and sand is prevented from being caught between the enlarged blade 5 and the link arm 11.
Therefore, it is possible to prevent the expansion blade 5 from being retracted and the head rod 1 from being unable to be pulled up.

また、リンク機構１０は、拡大翼５を拡開位置と格納位置との間を回動させる際に、リンク機構１０のリンクアーム１１が拡大翼５と同方向に回動するように構成しているので、鋏のように刃先が交差することがなく、拡大翼５とリンクアーム１１とが掘削土砂を噛み込むことはない。
即ち、拡大翼５は、拡開位置から閉翼するときには支点軸６中心に下方回動し、リンクアーム１１も同様に基部側軸１６中心に下方回動するので、拡大翼５とリンクアーム１１とは交差することがなく、掘削土砂を噛み込むことはない。 The link mechanism 10 is configured so that the link arm 11 of the link mechanism 10 rotates in the same direction as the expansion blade 5 when the expansion blade 5 is rotated between the expanded position and the retracted position. Therefore, the cutting edges do not intersect like a spear, and the expanding blade 5 and the link arm 11 do not bite the excavated earth and sand.
That is, the expansion blade 5 rotates downward about the fulcrum shaft 6 when closing the blade from the expanded position, and the link arm 11 similarly rotates downward about the base side shaft 16, so the expansion blade 5 and the link arm 11. There will be no crossing and no excavation soil will be caught.

リンク機構１０のリンクアーム１１は拡大翼５の左右幅より薄い板部材により形成し、拡大翼５の側面側に先端側軸１２により取付けているので、拡大翼５とリンクアーム１１は平面視において重ならないが、拡大翼５とリンクアーム１１とは、拡大翼５を回動させる際に、拡大翼５とリンクアーム１１とが側面視において一部が互いに重なる。
そのため、拡大翼５の拡開状態において、拡大翼５の下縁２２はリンクアーム１１と重なり、リンクアーム１１の上縁２３は拡大翼５と重なるように構成しており、拡大翼５とリンクアーム１１とは格納位置でも重なるので、拡大翼５とリンクアーム１１の間に隙間が生じることはなく、拡大翼５とリンクアーム１１の間に異物が挟まるのを防止する。 The link arm 11 of the link mechanism 10 is formed by a plate member thinner than the left and right widths of the enlarged wing 5 and is attached to the side surface side of the enlarged wing 5 by the distal end side shaft 12. Therefore, the enlarged wing 5 and the link arm 11 are viewed in plan view. Although the overlapping blades 5 and the link arm 11 do not overlap, when the expanding blade 5 is rotated, the expanding blade 5 and the link arm 11 partially overlap each other in a side view.
Therefore, in the expanded state of the expansion wing 5, the lower edge 22 of the expansion wing 5 overlaps with the link arm 11, and the upper edge 23 of the link arm 11 overlaps with the expansion wing 5. Since the arm 11 overlaps even in the retracted position, no gap is generated between the enlarged blade 5 and the link arm 11, and foreign matter is prevented from being caught between the enlarged blade 5 and the link arm 11.

なお、理解を容易にするために、拡大翼５の拡開状態において説明したが、拡大翼５の格納状態で拡大翼５の内側縁が下縁２２となってリンクアーム１１の外側縁である上縁２３と重なり、拡大翼５とリンクアーム１１とは重なった状態で、拡開位置と格納位置との間回動する。   In order to facilitate understanding, the expansion blade 5 has been described in the expanded state. However, when the expansion blade 5 is retracted, the inner edge of the expansion blade 5 becomes the lower edge 22 and is the outer edge of the link arm 11. It overlaps with the upper edge 23, and the enlarged wing 5 and the link arm 11 overlap with each other and rotate between the expanded position and the retracted position.

拡大翼５の支点軸６と、リンクアーム１１の先端側軸１２および基部側軸１６は、閉翼状態において、リンク機構１０の一端の拡大翼５への取付位置を拡大翼５の長さ方向の中間位置とし、リンク機構１０の他端の油圧シリンダ１７側となる移動体１５への取付位置を、拡大翼５の支点軸６に対しての拡大翼５のリンクアーム１１の取付位置とは反対の位置としているので、拡大翼５が拡開位置から閉翼位置へ回動する際、拡大翼５とヘッドロッド１との間にリンク機構１０のリンクアーム１１が存在せず、拡大翼５とリンクアーム１１との間に掘削土砂の噛み込みを防止する。   The fulcrum shaft 6 of the expansion blade 5, the distal end side shaft 12 and the base side shaft 16 of the link arm 11 are attached to the expansion blade 5 at one end of the link mechanism 10 in the length direction of the expansion blade 5 in the closed blade state. The attachment position of the other end of the link mechanism 10 to the moving body 15 on the hydraulic cylinder 17 side is the attachment position of the link arm 11 of the expansion blade 5 with respect to the fulcrum shaft 6 of the expansion blade 5. Since the opposite positions are set, when the expanding blade 5 rotates from the expanded position to the closed blade position, the link arm 11 of the link mechanism 10 does not exist between the expanding blade 5 and the head rod 1, and the expanding blade 5 And the link arm 11 prevent the excavated soil from being caught.

なお、拡大翼５は、拡大翼５の支点軸６と、リンクアーム１１の先端側軸１２および基部側軸１６の位置関係を上下反対にして、拡大翼５は支点軸６中心に下方回動によって拡開するように構成してもよい。   The expanding blade 5 has the fulcrum shaft 6 of the expanding blade 5 and the positional relationship between the tip side shaft 12 and the base side shaft 16 of the link arm 11 turned upside down, and the expanding blade 5 rotates downward about the fulcrum shaft 6. You may comprise so that it may expand by.

１…ヘッドロッド 、２…掘削ヘッド 、３…取付部、４…ブラケット、５…拡大翼、６…支点軸、７…中間開口部、１０…リンク機構、１１…リンクアーム、１２…先端側軸、１５…移動体、１６…基部側軸、１７…油圧シリンダ、１８…ピストンロッド、１８Ａ…縦穴、１９…ピストン、２０…シリンダチューブ、２２…下縁、２３…上縁、２５…縦孔、２６…固化液供給管、２７…吐出口、２８…圧力油供給二重管、２９…圧力油供給路、３０…縮側スペース、３１…圧力油供給路、３２…伸側スペース、３３…雄継手、３４…掘削ビット、３５…掘削ビット。   DESCRIPTION OF SYMBOLS 1 ... Head rod, 2 ... Excavation head, 3 ... Mounting part, 4 ... Bracket, 5 ... Expansion blade, 6 ... Supporting shaft, 7 ... Intermediate opening part, 10 ... Link mechanism, 11 ... Link arm, 12 ... Tip side axis , 15 ... moving body, 16 ... base side shaft, 17 ... hydraulic cylinder, 18 ... piston rod, 18A ... vertical hole, 19 ... piston, 20 ... cylinder tube, 22 ... lower edge, 23 ... upper edge, 25 ... vertical hole, 26 ... Solidified liquid supply pipe, 27 ... Discharge port, 28 ... Pressure oil supply double pipe, 29 ... Pressure oil supply path, 30 ... Reduced side space, 31 ... Pressure oil supply path, 32 ... Extended side space, 33 ... Male Joint, 34 ... excavation bit, 35 ... excavation bit.

Claims (4)

下端に設けた掘削ヘッド２の上方所定位置のヘッドロッド１の外周に、ヘッドロッド１側に閉翼する格納位置から前記掘削ヘッド２の掘削径より大径の拡開位置へ回動する複数の拡大翼５を設け、該拡大翼５は前記ヘッドロッド１内に設けた単独の油圧シリンダ１７による移動体１５のヘッドロッド１軸心方向の伸縮移動をリンク機構１０のリンクアーム１１により伝達して格納位置と拡開位置との間回動するとすると共に、リンクアーム１１の基部は基部側軸１６により油圧シリンダ１７によりヘッドロッド１に対して軸方向に移動する移動体１５に取付け、基部側軸１６は、拡大翼５の格納状態において、拡大翼５をヘッドロッド１に回動自在に取付けた支点軸６と略同一高さ、または、上方に配置構成した油圧シリンダ式拡大ヘッド。 A plurality of rotations from the retracted position closing the head rod 1 to the outer periphery of the head rod 1 at a predetermined position above the excavation head 2 provided at the lower end to the widening position larger than the excavation diameter of the excavation head 2. The expansion blade 5 is provided, and the expansion blade 5 transmits the expansion and contraction movement of the moving body 15 in the axial direction of the head rod 1 by the single hydraulic cylinder 17 provided in the head rod 1 by the link arm 11 of the link mechanism 10. The base portion of the link arm 11 is attached to a moving body 15 that moves in the axial direction with respect to the head rod 1 by a hydraulic cylinder 17 by a base side shaft 16 and rotates between a retracted position and an expanded position. Reference numeral 16 denotes a hydraulic cylinder type expansion head which is arranged at the same height as or above the fulcrum shaft 6 in which the expansion blade 5 is rotatably attached to the head rod 1 in the retracted state of the expansion blade 5 . 請求項１において、前記拡大翼５とリンクアーム１１とは、拡大翼５の拡開状態において、拡大翼５の下縁２２はリンクアーム１１と重なり、リンクアーム１１の上縁２３は拡大翼５と重なる構成とした油圧シリンダ式拡大ヘッド。 In claim 1, the expansion wing 5 and the link arm 11 are configured such that, in the expanded state of the expansion wing 5, the lower edge 22 of the expansion wing 5 overlaps the link arm 11, and the upper edge 23 of the link arm 11 is the expansion wing 5. Hydraulic cylinder type expansion head with a configuration that overlaps with . 請求項１または請求項２において、前記リンク機構１０は、拡大翼５が拡開位置と格納位置との間回動する際に、リンク機構１０のリンクアーム１１が拡大翼５と同方向に回動する構成とした油圧シリンダ式拡大ヘッド。 The link mechanism 10 according to claim 1 or 2, wherein the link arm 11 of the link mechanism 10 rotates in the same direction as the expanding blade 5 when the expanding blade 5 rotates between the expanded position and the retracted position. Hydraulic cylinder type expansion head configured to move . 請求項３において、前記拡大翼５の基部は支点軸６によりヘッドロッド１側に回動自在に取付け、前記リンク機構１０のリンクアーム１１の一端は拡大翼５へ先端側軸１２により取付け、リンクアーム１１の他端は油圧シリンダ１７により移動する移動体１５に基部側軸１６により取付け、前記拡大翼５の支点軸６と、前記リンクアーム１１の先端側軸１２および基部側軸１６とは、拡大翼５の閉翼状態で、リンク機構１０の基部側軸１６、拡大翼５の支点軸６、リンク機構１０の先端側軸１２の順に上から配置した油圧シリンダ式拡大ヘッド。 4. The base of the expansion wing 5 is rotatably attached to the head rod 1 side by a fulcrum shaft 6, and one end of the link arm 11 of the link mechanism 10 is attached to the expansion wing 5 by a distal end side shaft 12. The other end of the arm 11 is attached to a moving body 15 that is moved by a hydraulic cylinder 17 by a base side shaft 16, and the fulcrum shaft 6 of the expanding blade 5, the tip side shaft 12 and the base side shaft 16 of the link arm 11 are: A hydraulic cylinder type expansion head arranged from above in the order of the base side shaft 16 of the link mechanism 10, the fulcrum shaft 6 of the expansion blade 5, and the tip side shaft 12 of the link mechanism 10 in the closed state of the expansion blade 5 .
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