JP2006194022A - Fluid pressure type expansion head - Google Patents

Fluid pressure type expansion head Download PDF

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Publication number
JP2006194022A
JP2006194022A JP2005008483A JP2005008483A JP2006194022A JP 2006194022 A JP2006194022 A JP 2006194022A JP 2005008483 A JP2005008483 A JP 2005008483A JP 2005008483 A JP2005008483 A JP 2005008483A JP 2006194022 A JP2006194022 A JP 2006194022A
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Prior art keywords
cylinder
expansion
head
pressure
blade
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JP3963019B2 (en
Inventor
Makoto Kono
真 河野
Hiroshi Kobayashi
寛 小林
Mitsugi Otsuki
貢 大槻
Atsushi Shibata
厚志 柴田
Sakae Yukimatsu
栄 行松
Kazuo Yamazaki
一雄 山崎
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SUMISHO TEKKO HANBAI KK
Sumitomo Corp
Kubota Corp
Sanwa Kizai Co Ltd
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SUMISHO TEKKO HANBAI KK
Sumitomo Corp
Kubota Corp
Sanwa Kizai Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid pressure type expansion head free from malfunction, with the minimum possible equipment cost. <P>SOLUTION: A hydraulic expansion head is provided with a hydraulic cylinder having a head rod coaxially equipped within it, a reciprocating component supported in the hydraulic cylinder so that it can be axially movable to and away from the lower end of the head rod, expandable wings supported by the reciprocating component so that they can swing within the longitudinal plane of the head rod, and also linked with the head rod so that they can expand and shrink as the reciprocating component goes and back, a heavy excavation head fixed to the reciprocating component, a pressure water outlet provided at the hydraulic cylinder to discharge the pressure water supplied out of the cylinder after it pushes the reciprocating component to an end point. Thereby, the hydraulic cylinder can only serve to open the expandable wings, and their closure may be achieved by the dead weight of the excavation head after the pressure water supplied is released. Further, the system is provided with an expandable wing closure retainer to releasably hold the closed wings in such state when they are closed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、掘削スクリューロッドにより縦孔を掘削した後該縦孔内に既成杭を圧入する外堀り式杭建込み工法、既成中空杭内に挿通した掘削スクリューロッドにより中空杭内を掘削しつつ該中空杭を圧入する中掘り式中空杭建込み工法等において、上記既成杭の下端部に拡大球根を造成するための拡大掘削を行う流体圧式拡大ヘッドに関する。   The present invention relates to an external excavation type pile erection method in which a prefabricated pile is press-fitted into the vertical hole after excavating a vertical hole with a drilling screw rod, The present invention relates to a fluid pressure type expansion head for performing an expansion excavation for forming an expansion bulb at the lower end portion of the above-mentioned existing pile in a medium digging type hollow pile erection method for press-fitting the hollow pile.

従来、掘削スクリューロッドの下端に設けた拡大ヘッドとして、ヘッドロッドの外周面における直径方向相対する位置にブラケットを突設し、両ブラケットに拡大翼の基部を、上記ヘッドロッドの横断平面上で拡縮揺動できるように軸支し、上記スクリューロッドの正転掘削時には拡大翼は閉縮しているが、逆転時に拡大翼が土圧により拡開するようにしたものが知られている。   Conventionally, as an enlargement head provided at the lower end of the drilling screw rod, brackets are protruded at positions opposite to each other in the diametrical direction on the outer peripheral surface of the head rod, and the bases of the enlargement blades are enlarged and contracted on the transverse plane of the head rod. It is known that the wings are supported so that they can swing, and the expansion wings are closed during the forward excavation of the screw rod, but the expansion wings are expanded by earth pressure during the reverse rotation.

しかし、上記の従来ヘッドは、スクリューロッドの逆転時に、拡大翼が閉縮から一挙に最大径に拡開するため、硬い地盤での拡大掘削においては、掘削スクリューロッドの回転駆動部に過大な負荷が急激に加わり、それが回転駆動部を回転不能にすることがしばしばあった。   However, in the above conventional head, when the screw rod reverses, the expanding blade expands from the closed position to the maximum diameter all at once, so in the expanded excavation on hard ground, an excessive load is applied to the rotary drive part of the drilling screw rod. Often added rapidly, which made the rotary drive unrotatable.

これを改善するため、掘削スクリューロッドの下端部外側に拡大翼を該スクリューロッドの縦断平面上で拡縮揺動自在に支持すると共に、ロッド下端部内に油圧シリンダを内装し、該シリンダの往復駆動により上記拡大翼の拡開及び閉縮を行うものが多数開発された。   In order to improve this, an expanding wing is supported outside the lower end of the drilling screw rod so as to be able to expand and contract on the longitudinal plane of the screw rod, and a hydraulic cylinder is housed inside the lower end of the rod. Many have been developed to expand and close the expansion wing.

しかし、上記の油圧式拡大ヘッドでは、油圧シリンダに圧力油を供給すると同時に油圧シリンダから圧力油を油圧タンクに戻す配管、油圧源、制御機器等を含む正規の油圧装置を必要とするため、設備費が高価につく欠点があり、しかも掘削スクリューロッドの継ぎ足し作業時に、油圧回路内に不純物の混入する危険が避けられず、それが原因となって油圧機器の作動不良が生じることがあった。
実開昭57−101189公報 特開昭57−140491公報
However, the above-mentioned hydraulic expansion head requires a regular hydraulic device including a piping, a hydraulic source, a control device, etc. that supplies pressure oil to the hydraulic cylinder and simultaneously returns the hydraulic oil from the hydraulic cylinder to the hydraulic tank. There is a disadvantage that the cost is high, and there is a risk that impurities are mixed in the hydraulic circuit during the drilling screw rod addition work, which may cause malfunction of the hydraulic equipment.
Japanese Utility Model Publication No. 57-101189 Japanese Patent Laid-Open No. 57-140491

本発明は、設備費を可能な限り廉価におさえると共に、作動不良や故障のない拡大ヘッドを提供することを課題とする。   It is an object of the present invention to provide an enlarged head that keeps the equipment cost as low as possible and is free from malfunctions and failures.

上記課題を達成するため、本発明は、流体圧シリンダにより拡大翼の拡開、閉縮のいずれか一方向の作動を行い、他方向の作動を上記シリンダ以外の外力によって行うという着想に至り、それに基づいて、
ヘッドロッド内に流体圧シリンダを内装し、該シリンダの往復駆動体を、上記ヘッドロッド下端から軸方向へ進退できるように支持し、
上記駆動体に拡大翼を、上記ヘッドロッドの縦断平面上で揺動できるように軸支すると共に、該駆動体の進退により上記拡大翼を拡縮させるべく該拡大翼を上記ヘッドロッドとリンク連結し、
上記流体圧シリンダにおいて、圧力流体供給により上記駆動体を往、復いずれか一方向の所定位置まで駆動したとき、該駆動体を上記シリンダ外部の外力により他方向に駆動できるように上記シリンダ内を減圧する手段を設け、それにより上記拡大翼の拡開、閉縮いずれか一方向の作動を上記シリンダへの圧力流体供給により行い、他方向の作動を上記シリンダ外部の外力により行うようにし、
上記拡大翼の閉縮時に該拡大翼を閉縮状態に係脱自在に保持する拡大翼閉縮保持装置を備えた、
流体圧式拡大ヘッドを提案する。
In order to achieve the above object, the present invention has led to the idea that the fluid pressure cylinder operates in one direction of expansion and contraction of the expansion blade, and the operation in the other direction is performed by an external force other than the cylinder. Based on that
A fluid pressure cylinder is housed in the head rod, and the reciprocating drive body of the cylinder is supported so as to advance and retreat in the axial direction from the lower end of the head rod.
The expansion wing is pivotally supported on the drive body so that it can swing on the longitudinal plane of the head rod, and the expansion wing is linked to the head rod so that the expansion wing can be expanded and contracted by the advancement and retraction of the drive body. ,
In the fluid pressure cylinder, when the driving body is driven to a predetermined position in either one of the forward and backward directions by supplying a pressure fluid, the inside of the cylinder is driven so that the driving body can be driven in the other direction by an external force outside the cylinder. A means for reducing the pressure is provided, whereby the expansion blade is expanded or closed in one direction by the pressure fluid supply to the cylinder, and the other direction is operated by an external force outside the cylinder.
An enlarged blade closing / retaining device for releasably holding the expanding blade in the closed state when the expanding blade is closed;
We propose a fluid pressure expansion head.

本発明の流体圧式拡大ヘッドによれば、拡大翼の拡開は、シリンダへの圧力流体の供給により駆動体を一方向に駆動することにより行い、ついで拡大翼の閉縮は、上記駆動体が一定方向の所定位置に駆動したとき上記シリンダ内の減圧により、シリンダ外部の外力によって行うことができ、それにより流体圧装置は、場合によっては、流体圧ポンプだけで足りる程の簡単なものとなり、設備費の大幅な低減を実現できると共に、そのように簡単な流体圧装置であれば、従来の油圧式拡大ヘッドのように掘削スクリューロッドの継ぎ足し作業時に流体圧回路内に不純物が混入することがあっても、作動不良等の支障を来すことはない。   According to the fluid pressure type expansion head of the present invention, the expansion blade is expanded by driving the driving body in one direction by supplying a pressure fluid to the cylinder, and then the expansion body is closed and contracted by the driving body. When driven to a predetermined position in a certain direction, the pressure in the cylinder can be reduced by an external force outside the cylinder, so that the fluid pressure device is simple enough that only a fluid pressure pump is sufficient in some cases, Equipment costs can be significantly reduced, and with such a simple fluid pressure device, impurities can be mixed in the fluid pressure circuit during drilling screw rod addition work like conventional hydraulic expansion heads. Even if there is, there will be no trouble such as malfunction.

本発明における流体圧シリンダの上記「駆動体」とは、ピストンを固定したタイプのシリンダにおいてはシリンダチューブであり、シリンダチューブを固定したタイプのシリンダにおいてはピストン又はピストンロッドである。
又、上記「外力」には、上記駆動体に掘削ヘッドその他の部材を固定した場合の該掘削ヘッドその他の部材の重量、上記拡大翼が土中にあるときに該拡大翼に及ぶ土圧又は土砂抵抗等がある。
さらに、上記「シリンダ内を減圧する手段」には、シリンダチューブに設けた大気中に開閉自在の放出口であって、上記駆動体が一方向の所定位置まで駆動したとき開口して、シリンダチューブ内の圧力流体を大気中に放出するもの、その他種々のものが使用される。
The above-mentioned “driving body” of the fluid pressure cylinder in the present invention is a cylinder tube in a cylinder with a fixed piston, and a piston or a piston rod in a cylinder with a fixed cylinder tube.
The “external force” includes the weight of the excavation head and other members when the excavation head and other members are fixed to the driving body, the earth pressure applied to the expansion wing when the expansion wing is in the soil, or There is earth and sand resistance.
Further, the “means for depressurizing the inside of the cylinder” includes a discharge port that is openable and closable in the atmosphere provided in the cylinder tube, and is opened when the driving body is driven to a predetermined position in one direction. Those that discharge the pressure fluid in the atmosphere to the atmosphere and other various types are used.

図1、2に示す拡大ヘッド(A)は、ピストン固定型水圧シリンダを使用した例で、中空ヘッドロッド(1)内の中間部に固定されたトップブロック(2)から下のロッド(1)内を、下端を開口した12角筒の案内筒(3)に形成し、該案内筒(3)内に、外周面を上記案内筒(3)と対応する12角面とした両端閉成の水圧シリンダチューブ(4)を軸方向摺動自在かつ回転不能に嵌合すると共に、該チューブ(4)内にピストン(5)を摺動自在に挿入し、このチューブ(4)の下端面に、上記ヘッドロッド(1)の下端部分に摺動自在に被嵌された外筒(6)をボルト(7)、(8)により固定し、該外筒(6)の外周面に、下縁にビット(10)…を有する高重量の掘削ヘッド(9)を突設してある。   The enlarged head (A) shown in FIGS. 1 and 2 is an example in which a piston-fixed hydraulic cylinder is used, and the lower rod (1) from the top block (2) fixed to the intermediate portion in the hollow head rod (1). The inside is formed in a 12-cylinder cylindrical guide tube (3) having an open lower end, and both ends are closed in the guide tube (3) with the outer peripheral surface being a 12-sided surface corresponding to the guide tube (3). The hydraulic cylinder tube (4) is axially slidable and non-rotatably fitted, and a piston (5) is slidably inserted into the tube (4). The outer cylinder (6) slidably fitted to the lower end portion of the head rod (1) is fixed with bolts (7) and (8), and is attached to the outer peripheral surface of the outer cylinder (6) on the lower edge. A heavy weight drilling head (9) with bits (10).

上記ピストン(5)の固定構造は次のようである。上記トップブロック(2)の下面中心部にピストンロッド兼グラウト供給管(11)、下面一側に圧力水供給管(12)の各上端をそれぞれ固定して垂下し、これら管(11)、(12)の下端部分を上記シリンダチューブ(4)上端壁を摺動自在に貫通してチューブ(4)内に突出し、そのうち一方のグラウト供給管(11)の突出端部は上記ピストン(5)の中心部に貫通状態に固定し、他方の圧力水供給管(12)の突出端部は上記ピストン(5)一側部に埋設状態に固定し、このように管(11)、(12)の下端部にピストン(5)を保持している。   The structure for fixing the piston (5) is as follows. A piston rod and grout supply pipe (11) is fixed to the center of the lower surface of the top block (2), and each upper end of the pressure water supply pipe (12) is fixed to the lower surface of the top block (2). 12) slidably penetrates the upper end wall of the cylinder tube (4) and protrudes into the tube (4), and the protruding end portion of one of the grout supply pipes (11) is formed on the piston (5). The protruding end of the other pressure water supply pipe (12) is fixed to the piston (5) on one side, and is thus fixed to the center of the pipe (11), (12). The piston (5) is held at the lower end.

上記グラウト供給管(11)内には、その下端からグラウト供給伸縮管(13)をシール部を介して伸縮自在に挿入し、該伸縮管(13)の下端部を上記シリンダチューブ(4)下端壁及び上記外筒(6)下端壁に貫通してグラウト射出口(14)に接続固定してある   A grout supply telescopic pipe (13) is inserted into the grout supply pipe (11) from the lower end through a seal portion so as to be extendable and contracted, and the lower end of the expansion pipe (13) is connected to the lower end of the cylinder tube (4). The wall and the outer cylinder (6) penetrate through the lower end wall and are connected and fixed to the grout injection port (14).

上記圧力水供給管(12)の下端側壁には、特に図3に示すように、上記シリンダチューブ(4)のロッドがわスペースに開口する圧力水供給口(15)を設けてある。   The pressure water supply pipe (12) is provided with a pressure water supply port (15) in which the rod of the cylinder tube (4) opens into the space as shown in FIG.

上記シリンダ内を減圧する手段として、シリンダチューブ(4)の周壁には、上記チューブ(4)が図2のように最上位に上昇したときにおける上記ピストン(5)の上面よりやや上位に圧力水放出口(16)、(16)を開設すると共に、上記ヘッドロッド(1)及び外筒(6)の両周壁に、上記チューブ(4)とともに外筒(6)も最上位に上昇したときにおける上記放出口(16)、(16)と合致する位置に圧力水放出口(17)、(17)及び(18)、(18)を開設してある。   As means for depressurizing the inside of the cylinder, the peripheral wall of the cylinder tube (4) has pressure water slightly above the upper surface of the piston (5) when the tube (4) is raised to the uppermost position as shown in FIG. When the discharge ports (16) and (16) are opened, the outer cylinder (6) together with the tube (4) rises to the uppermost position on both peripheral walls of the head rod (1) and the outer cylinder (6). Pressure water discharge ports (17), (17), (18), and (18) are opened at positions corresponding to the discharge ports (16) and (16).

従って、今、図1のようにシリンダチューブ(4)が最下位に降下し、圧力水放出口(16)(17)(18)、(16)(17)(18)が合致していない状態で、圧力水が供給管(12)、供給口(15)を通じてチューブ(4)のロッドがわスペースに圧送されると、上記チューブ(4)及び外筒(6)がグラウト供給伸縮管(13)を縮小させつつ上昇し、最上位に上昇したとき図2のように圧力水放出口(16)(17)(18)、(16)(17)(18)が合致し、それによりチューブ(4)のロッドがわスペース内の圧力水が該合致した放出口から外部へ放出され、上記チューブ(4)及び外筒(6)が掘削ヘッド(9)の重量により降下しようとする。その際、供給管(12)からロッドがわスペースへの圧力水圧送を継続すれば、上記チューブ(4)及び外筒(6)は上下微動を繰り返しつつ上昇位置に留まる。しかし、圧力水の圧送を停止し、圧力水供給路を開放すると、上記チューブ(4)及び外筒(6)が掘削ヘッド(9)の重量により降下して図1の状態に戻ることとなる。   Accordingly, as shown in FIG. 1, the cylinder tube (4) is lowered to the lowest position, and the pressure water discharge ports (16), (17), (18), (16), (17), and (18) do not match. When the pressure water is pumped into the space through the supply pipe (12) and the supply port (15), the tube (4) and the outer cylinder (6) are connected to the grout supply expansion pipe (13). ) Is reduced and the pressure water discharge ports (16), (17), (18), (16), (17), and (18) are matched as shown in FIG. The pressure water in the rod space of 4) is discharged to the outside from the matched discharge port, and the tube (4) and the outer cylinder (6) try to descend due to the weight of the excavation head (9). At that time, if the pressure water pumping from the supply pipe (12) to the rod space is continued, the tube (4) and the outer cylinder (6) remain in the ascending position while repeating fine movements. However, when the pumping of the pressure water is stopped and the pressure water supply path is opened, the tube (4) and the outer cylinder (6) are lowered by the weight of the excavation head (9) and returned to the state of FIG. .

拡大翼(19)、(19)の拡開機構は次のようである。上記外筒(6)の外周面の直径方向相対する位置にブラケット(20)、(20)を突設し、該ブラケット(20)、(20)に拡大翼(19)、(19)の基部を、ヘッドロッド(1)縦断平面上で揺動できるように、ピン(21)、(21)により支承し、又、上記ヘッドロッド(1)の外周面における上記ブラケット(20)、(20)上方の対応する位置にブラケット(22)、(22)を突設し、該ブラケット(22)、(22)にリンク(23)、(23)の一端部をピン(24)、(24)により支承すると共に、該リンク(23)、(23)の他端部を、上記拡大翼(19)、(19)の上記ピン(21)、(21)から先端がわへ若干離間した位置に、ピン(25)、(25)により連結してある。   The expansion mechanism of the expansion blades (19) and (19) is as follows. Brackets (20), (20) project from the outer peripheral surface of the outer cylinder (6) in the diametrical direction, and the bases of the enlarged wings (19), (19) are provided on the brackets (20), (20). Is supported by pins (21) and (21) so that it can swing on the longitudinal plane of the head rod (1), and the brackets (20) and (20) on the outer peripheral surface of the head rod (1). Brackets (22) and (22) are projected at corresponding positions above, and links (23) and (23) are attached to the brackets (22) and (22) by pins (24) and (24). While supporting, the other ends of the links (23), (23) are slightly spaced from the pins (21), (21) of the expansion wings (19), (19) to the wings. They are connected by pins (25) and (25).

この場合、上記チューブ(4)及び外筒(6)が最下位に降下したときは、図1に示すように、拡大翼(19)、(19)が上方へ揺動して、ヘッドロッド(1)に添接する閉縮状態をとり、上記チューブ(4)及び外筒(6)が最上位に上昇したとき、図2に示すように水平位置に開いた拡開状態をとる位置関係にあり、又、上記図2の拡開状態において、上記シリンダチューブ(4)への圧力水供給路を開放したときは、上記掘削ヘッド(9)の重量により上記チューブ(4)及び外筒(6)を降下させて拡大翼(19)、(19)を閉縮位置に揺動させる重量関係にある。   In this case, when the tube (4) and the outer cylinder (6) are lowered to the lowest position, as shown in FIG. 1, the enlarged wings (19), (19) are swung upward, and the head rod ( When the tube (4) and the outer cylinder (6) are lifted to the uppermost position when the tube (4) and the outer cylinder (6) are lifted to the uppermost position as shown in FIG. In addition, when the pressure water supply passage to the cylinder tube (4) is opened in the expanded state of FIG. 2, the tube (4) and the outer cylinder (6) due to the weight of the excavation head (9). Is lowered so that the enlarged wings (19) and (19) are swung to the closed position.

次に、上記拡大翼(19)、(19)を閉縮位置に係脱可能に保持する装置について説明する。図4、5において、保持枠(26)は両端を開口した短円筒状の環状体で、その周壁の直径方向相対する部位に、上記拡大翼(19)、(19)の先端部(P)、(P)が出入りすべき案内口(27)、(27)を保持枠(26)下辺から切欠して形成してある。   Next, a description will be given of a device that holds the expansion blades (19) and (19) in a closed / retracted position. 4 and 5, the holding frame (26) is a short cylindrical annular body having both ends opened, and the distal end portion (P) of the expansion wings (19) and (19) is disposed at a diametrically opposed portion of the peripheral wall. , (P) is formed by notching guide openings (27) and (27) from which the holding frame (26) is lowered.

この保持枠の内側に、ほぼ90度間隔のステー(28)…を介して回転支持リング(29)を同心的に固定し、それにより保持枠(26)と支持リング(29)及び隣り合うステー(28)、(28)の間に直径方向に相対する2つの扇形スペースを形成すると共に、各扇形スペースのほぼ半分のスペースを上記案内口(27)と面する待機スペース(30)に、残りの半分を、上記待機スペース(30)と連通する案内口の無い拡大翼先端部保持スペース(31)としてある。   A rotation support ring (29) is concentrically fixed to the inside of the holding frame via stays (28)... At intervals of approximately 90 degrees, whereby the holding frame (26) and the support ring (29) and adjacent stays are fixed. (28) and (28) form two fan-shaped spaces opposite to each other in the diametrical direction, and approximately half of each fan-shaped space remains in the standby space (30) facing the guide port (27). One half of this is used as an enlarged blade tip holding space (31) without a guide port communicating with the standby space (30).

上記案内口(27)、(27)における上記保持スペース(31)と反対がわの回転方向口縁には、拡大翼先端部(P)、(P)を案内するための案内板(32)、(32)を直径方向とほぼ平行に向けて上記待機スペース(30)内から外方へ適宜長突出する状態に固定してある。   A guide plate (32) for guiding the enlarged blade tips (P) and (P) is provided at the rotation direction mouth edge opposite to the holding space (31) in the guide ports (27) and (27). , (32) is fixed so as to protrude from the inside of the standby space (30) to the outside as long as it is substantially parallel to the diameter direction.

さらに、上記ステー(28)…のうち直径方向相対する一対のステー(28)、(28)を保持枠(26)外へ放射状に延出して土圧受圧板(33)、(33)に形成してある。   Further, a pair of stays (28), (28) opposed to each other in the diametrical direction among the stays (28) are radially extended out of the holding frame (26) to form earth pressure receiving plates (33), (33). It is.

一方、上記ヘッドロッド(1)の上端部外周面に、図1に示すように上下一対のフランジに挾まれた回転受け部(34)を形成してあり、この受け部(34)に、上記保持枠(26)の支持リング(29)を回転自在に被嵌してある。この場合、上記保持枠(26)の案内口(27)、(27)は、拡大翼(19)、(19)の拡縮揺動時に該拡大翼先端部(P)、(P)が出入り可能の高さ及び幅に形成されると共に、上記保持枠(26)の下辺は、上記保持スペース(31)、(31)内に入りこんだ閉縮時の拡大翼先端部(P)、(P)を出入り不能に保持できる位置関係にあり、又上記受圧板(33)、(33)は、その受圧面を回転方向に向けている。   On the other hand, a rotation receiving portion (34) sandwiched between a pair of upper and lower flanges is formed on the outer peripheral surface of the upper end portion of the head rod (1), as shown in FIG. A support ring (29) of the holding frame (26) is rotatably fitted. In this case, the guide ports (27), (27) of the holding frame (26) can be moved in and out of the enlarged blade tips (P), (P) when the enlarged blades (19), (19) are expanded and contracted. And the lower edge of the holding frame (26) extends into the holding spaces (31) and (31), and the enlarged blade tips (P) and (P) when closed. The pressure receiving plates (33) and (33) have their pressure receiving surfaces facing the rotation direction.

なお、上記グラウト供給管(11)及び圧力水供給管(12)は、ヘッドロッド(1)上部内に縦通された二重管における外側のグラウト供給路(35)及び内側の圧力水供給路(36)にそれぞれ接続され、さらに本拡大ヘッド(A)を例えば掘削スクリューロッドの下端に接続した場合は、上記供給路(35)、(36)を、該掘削スクリューロッドに縦通されたグラウト供給路及び圧力水供給路にそれぞれ接続し、ついで回転継手を介して外部のグラウトポンプ及び水圧ポンプにそれぞ接続する。   The grout supply pipe (11) and the pressure water supply pipe (12) are an outer grout supply path (35) and an inner pressure water supply path in a double pipe vertically passed through the upper portion of the head rod (1). (36) is connected to each other, and when this enlargement head (A) is connected to, for example, the lower end of the drilling screw rod, the grout vertically connected to the drilling screw rod is connected to the supply passages (35), (36). Each is connected to a supply path and a pressure water supply path, and then connected to an external grout pump and a water pressure pump via a rotary joint.

上例の拡大ヘッド(A)を外掘り式杭建込み工法の球根造成に使用した例について説明する。拡大ヘッド(A)を掘削スクリューロッド(R)の下端に接続する。拡大翼(19)、(19)を閉縮し、拡大翼先端部(P)、(P)を保持枠(26)の保持スペース(31)内に保持している図1の状態において、スクリューロッド(R)、拡大ヘッド(A)を正転(図1矢印)させ、その掘削ヘッド(9)により地盤に縦孔掘削を開始する。掘進中、受圧板(33)、(33)が周囲の土圧を受けて保持枠(26)の回転を抑制するから、上記拡大翼先端部(P)、(P)も正転して図4における保持スペース(31)の奥へ入りこんで閉縮状態を確保される。その場合上記拡大翼先端部(P)、(P)が保持スペース最奥のステー(28)、(28)を押して保持枠(26)を同方向へ随伴させる。   The example which used the expansion head (A) of the upper example for the bulb construction of an external digging type pile construction method is demonstrated. The enlargement head (A) is connected to the lower end of the drilling screw rod (R). In the state of FIG. 1 in which the expansion blades (19) and (19) are closed and the expansion blade tips (P) and (P) are held in the holding space (31) of the holding frame (26), The rod (R) and the enlargement head (A) are normally rotated (arrows in FIG. 1), and the excavation head (9) starts excavation of the vertical hole in the ground. During the excavation, the pressure receiving plates (33) and (33) receive the surrounding earth pressure and suppress the rotation of the holding frame (26), so that the enlarged blade tips (P) and (P) are also rotated forward. 4 enters the back of the holding space (31) and a closed state is secured. In that case, the enlarged blade tips (P) and (P) push the stays (28) and (28) at the innermost part of the holding space to cause the holding frame (26) to follow in the same direction.

支持地盤に至ったら、スクリューロッド(R)、拡大ヘッド(A)を逆転に切換えると、上記保持枠(26)の保持スペース(31)、(31)にある拡大翼先端部(P)、(P)が上記保持枠(26)を静止状態に残して待機スペース(30)、(30)に移動し、ついで案内板(32)、(32)を押して保持枠(26)を逆転方向へ随伴させる。そこで圧力水を供給路(36)、供給管(12)を経てシリンダチューブ(4)のロッドがわスペースに圧送すると、上記チューブ(4)、外筒(6)が上昇して拡大翼(19)、(19)を拡開揺動させ、それにより拡大翼(19)、(19)は、その先端部(P)、(P)を案内口(27)、(27)から保持枠(26)外へ離脱して水平拡開位置まで揺動する。   When the support ground is reached, when the screw rod (R) and the expansion head (A) are switched to reverse rotation, the expansion blade tip (P) in the holding space (31), (31) of the holding frame (26) ( P) leaves the holding frame (26) in a stationary state and moves to the standby spaces (30) and (30), and then pushes the guide plates (32) and (32) to move the holding frame (26) in the reverse direction. Let Therefore, when the pressure water is pumped through the supply path (36) and the supply pipe (12) to the rod space of the cylinder tube (4), the tube (4) and the outer cylinder (6) are lifted to expand the wing (19 ), (19) is swung open so that the enlarged wings (19), (19) have their tips (P), (P) moved from the guide ports (27), (27) to the holding frame (26). ) Pull out and swing to the horizontal expansion position.

水平位置に拡開したとき、放出口(16)(17)(18)、(16)(17)(18)が合致し、チューブ(4)内の圧力水を外部へ放出するが、上記チューブ(4)のロッドがわスペース内への圧力水の圧送を継続し、水圧をかけ続けることにより拡大翼(19)、(19)の拡開状態を保持する。   When expanded to a horizontal position, the discharge ports (16), (17), (18), (16), (17), and (18) match, and the pressure water in the tube (4) is discharged to the outside. The rod of (4) keeps the expanded state of the expanding blades (19) and (19) by continuing to pump the pressure water into the space and applying the water pressure.

その状態で逆転を継続して拡大翼(19)、(19)による拡大掘削を行いつつ、グラウト供給路(35)、供給管(11)、伸縮管(13)を経て射出口(14)から射出し、これを土砂と撹拌混合してソイルセメントを形成する。   In this state, while continuing the reverse rotation and performing the expanded excavation by the expansion blades (19), (19), the injection port (14) passes through the grout supply path (35), the supply pipe (11), and the telescopic pipe (13). It is injected and this is stirred and mixed with earth and sand to form a soil cement.

グラウト射出停止後スクリューロッド(R)の逆転を継続しつつ圧力水供給路を開放すると、掘削ヘッド(9)の重量によりチューブ(4)及び外筒(6)が降下し、拡大翼(19)、(19)を閉縮方向へ揺動させる。この場合保持枠(26)は受圧板(33)、(33)に土圧を受けて静止状態にあるから、閉縮位置に近づいた逆転拡大翼先端部(P)、(P)が案内板(32)、(32)に当接し、該案内板(32)、(32)を伴って逆転しながら案内板に添って案内口(27)、(27)から待機スペース(30)内に入る。   When the pressure water supply path is opened while the reverse rotation of the screw rod (R) is continued after the stop of the grout injection, the tube (4) and the outer cylinder (6) are lowered due to the weight of the excavation head (9), and the expanding blade (19) , (19) is swung in the closing and contracting direction. In this case, since the holding frame (26) is in a stationary state due to earth pressure received by the pressure receiving plates (33) and (33), the reverse expansion blade tip (P) and (P) approaching the closed position are the guide plates. (32), abuts on (32), enters the standby space (30) from the guide ports (27), (27) along the guide plate while reversing with the guide plates (32), (32). .

ついで、スクリューロッド(R)を正転に戻すと、上記拡大翼先端部(P)、(P)が待機スペース(30)、(30)から保持スペース(31)、(31)内に移動し、閉縮位置に係止される。そこでスクリューロッド(R)、拡大ヘッド(A)を地上に引き上げ、その後に既成杭を挿入し、杭下端部を拡大掘削孔のソイルセメント内に圧入する。ソイルセメント硬化後既成杭の下端部に拡大球根が造成される。   Next, when the screw rod (R) is returned to the normal rotation, the enlarged blade tip (P), (P) moves from the standby space (30), (30) into the holding space (31), (31). And locked in the closed position. Therefore, the screw rod (R) and the expansion head (A) are pulled up to the ground, and then the existing pile is inserted, and the lower end of the pile is press-fitted into the soil cement of the expansion excavation hole. After the soil cement is hardened, an enlarged bulb is created at the lower end of the prefabricated pile.

上例の球根造成操作において、拡大翼(19)、(19)を拡開した図2の状態で掘削スクリューロッド(R)を降下させて拡大掘削を行うときは、チューブ(4)のロッドがわスペースに圧力水を供給し続けるが、拡大翼(19)、(19)の拡開状態で掘削スクリューロッド(R)を上昇させて拡大掘削を行うときは、上記ロッドがわスペースへの圧力水供給を停止してもよい。   In the above bulb formation operation, when the excavation screw rod (R) is lowered and the excavation screw rod (R) is lowered in the state of FIG. 2 in which the expansion blades (19) and (19) are expanded, the rod of the tube (4) is Although the pressure water is continuously supplied to the wrinkle space, when the excavation screw rod (R) is lifted and the excavation screw rod (R) is lifted in the expanded state of the expansion wings (19), (19), The water supply may be stopped.

上記シリンダチューブ(4)を減圧する手段の他の実施例を説明する。その1は、上記外筒(6)の放出口(18)を除き、それに代え、外筒(6)の内周面に、拡大拡開時に上記放出口(17)と連通して上方へ延長し、延長上端で外部に開口する母線方向の放出溝を設けたもの、その2は、上記外筒(6)の放出口(18)を除き、それに代え、上記案内筒(3)の外周面に、上記放出口(17)と連通して上方へ延長し、延長上端で外部に開口する母線方向の放出溝を設けたもの、その3は、上記案内筒(3)の部材内に、拡大拡開時に上記放出口(16)と連通して上方へ延長し、上記案内筒(3)の上端部すなわちヘッドロッド(1)の上端部において外部に開口する母線方向の放出溝を設けたものである。   Another embodiment of the means for depressurizing the cylinder tube (4) will be described. The first is that, except for the discharge port (18) of the outer cylinder (6), instead of extending to the inner peripheral surface of the outer cylinder (6) and communicating with the discharge port (17) at the time of expansion and expansion. In addition, the one provided with a discharge groove in the busbar direction that opens to the outside at the upper end of the extension, No. 2, except for the discharge port (18) of the outer cylinder (6), instead of the outer peripheral surface of the guide cylinder (3) Further, there is provided a discharge groove extending in the upper direction in communication with the discharge port (17) and opened to the outside at the upper end of the extension, Part 3 is enlarged in the member of the guide tube (3). An outlet groove in the direction of the busbar that opens to the outside at the upper end portion of the guide cylinder (3), that is, the upper end portion of the head rod (1), communicates with the discharge port (16) at the time of expansion and extends upward. It is.

これらの例、特に第3の例によれば、放出水により球根造成用ソイルセメントの品質に悪影響を及ぼすことがない。   According to these examples, particularly the third example, the discharged water does not adversely affect the quality of the bulb-forming soil cement.

本発明による水圧式拡大ヘッドの縦断正面図である。It is a vertical front view of the hydraulic expansion head according to the present invention. 同上拡大翼拡開状態の縦断正面図である。It is a longitudinal front view of an expansion blade expansion state same as the above. 図1におけるピストン部分の拡大図である。It is an enlarged view of the piston part in FIG. 図1のIV−IV線切断端面図である。FIG. 4 is an end view taken along line IV-IV in FIG. 1. 図4における保持枠の右側面図である。It is a right view of the holding frame in FIG.

符号の説明Explanation of symbols

A 拡大ヘッド
1 ヘッドロッド
4 シリンダチューブ
5 ピストン
9 掘削ヘッド
16、17、18 圧力水放出口
19 拡大翼
P 拡大翼先端部
23 リンク
26 保持枠
27 案内口
30 待機スペース
31 保持スペース
32 案内板
33 土圧受圧板



A Expanding head 1 Head rod 4 Cylinder tube 5 Piston 9 Excavating head 16, 17, 18 Pressure water discharge port 19 Expanding blade P Expanding blade tip 23 Link 26 Holding frame 27 Guide port 30 Standby space 31 Holding space 32 Guide plate 33 Soil Pressure plate



Claims (5)

ヘッドロッド内に流体圧シリンダを内装し、該シリンダの往復駆動体を、上記ヘッドロッド下端から軸方向へ進退できるように支持し、
上記駆動体に拡大翼を、上記ヘッドロッドの縦断平面上で揺動できるように軸支すると共に、該駆動体の進退により上記拡大翼を拡縮させるべく該拡大翼を上記ヘッドロッドとリンク連結し、
上記流体圧シリンダにおいて、圧力流体供給により上記駆動体を往、復いずれか一方向の所定位置まで駆動したとき、該駆動体を上記シリンダ外部の外力により他方向に駆動できるように上記シリンダ内を減圧する手段を設け、それにより上記拡大翼の拡開、閉縮いずれか一方向の作動を上記シリンダへの圧力流体供給により行い、他方向の作動を上記シリンダ外部の外力により行うようにし、
上記拡大翼の閉縮時に該拡大翼を閉縮状態に係脱自在に保持する拡大翼閉縮保持装置を備えた、
流体圧式拡大ヘッド。
A fluid pressure cylinder is housed in the head rod, and the reciprocating drive body of the cylinder is supported so as to advance and retreat in the axial direction from the lower end of the head rod.
The expansion wing is pivotally supported on the drive body so that it can swing on the longitudinal plane of the head rod, and the expansion wing is linked to the head rod so that the expansion wing can be expanded and contracted by the advancement and retraction of the drive body. ,
In the fluid pressure cylinder, when the driving body is driven to a predetermined position in either one of the forward and backward directions by supplying a pressure fluid, the inside of the cylinder is driven so that the driving body can be driven in the other direction by an external force outside the cylinder. A means for reducing the pressure is provided, whereby the expansion blade is expanded or closed in one direction by supplying a pressure fluid to the cylinder, and the other direction is operated by an external force outside the cylinder.
An enlarged blade closing / retaining device for releasably holding the expanding blade in the closed state when the expanding blade is closed;
Fluid pressure expansion head.
ヘッドロッド内に流体圧シリンダを内装し、該シリンダの往復駆動体を、上記ヘッドロッド下端から軸方向へ進退できるように支持し、
上記駆動体に拡大翼を、上記ヘッドロッドの縦断平面上で揺動できるように軸支すると共に、該駆動体の進退により上記拡大翼を拡縮させるべく該拡大翼を上記ヘッドロッドとリンク連結し、
上記流体圧シリンダにおいて、圧力流体供給により上記駆動体を往、復いずれか一方向の所定位置まで駆動したとき、シリンダ外へ開通して該シリンダ内の圧力流体をシリンダ外へ放出する放出口を設け、それにより上記拡大翼の一方向の作動を上記シリンダへの圧力流体の供給により行い、拡大翼の他方向の作動を、上記圧力流体供給の開放後、外力により行うようにし、
上記拡大翼の閉縮時に該拡大翼を閉縮状態に係脱自在に保持する拡大翼閉縮保持装置を備えた、
流体圧式拡大ヘッド。
A fluid pressure cylinder is housed in the head rod, and the reciprocating drive body of the cylinder is supported so as to advance and retreat in the axial direction from the lower end of the head rod.
The expansion wing is pivotally supported on the drive body so that it can swing on the longitudinal plane of the head rod, and the expansion wing is linked to the head rod so that the expansion wing can be expanded and contracted by the advancement and retraction of the drive body. ,
In the fluid pressure cylinder, when the drive body is driven to a predetermined position in either one of the backward and forward directions by supplying the pressure fluid, a discharge port that opens to the outside of the cylinder and discharges the pressure fluid in the cylinder to the outside of the cylinder is provided. Provided so that the one-way operation of the expansion blade is performed by supplying a pressure fluid to the cylinder, and the operation of the expansion blade in the other direction is performed by an external force after the pressure fluid supply is released,
An enlarged blade closing / retaining device for releasably holding the expanding blade in the closed state when the expanding blade is closed;
Fluid pressure expansion head.
上記駆動体に重量のある掘削ヘッドを固定してあり、上記外力が主として上記掘削ヘッドの重量である、請求項1又は2に記載の流体圧式拡大ヘッド。   The hydraulic expansion head according to claim 1 or 2, wherein a heavy excavation head is fixed to the driving body, and the external force is mainly a weight of the excavation head. 上記外力が、上記拡大翼に及ぼす土圧である、請求項1又は2に記載の流体圧式拡大ヘッド。   The hydrostatic expansion head according to claim 1 or 2, wherein the external force is earth pressure exerted on the expansion blade. 上記拡大翼閉縮保持装置は、閉縮時の拡大翼の先端部を囲って保持できる位置関係で、上記ヘッドロッドに該ロッド軸心について回転自在に支持された環状保持枠を有し、
上記保持枠は、その周面に上記拡大翼先端部が拡縮時に出入り可能の案内口を開口すると共に、保持枠内に、上記案内口に面する待機スペース及び上記待機スペースと回転方向に連通し且つ上記案内口に面しない拡大翼先端部保持スペースを有し、
上記案内口の両側の口縁のうち上記保持スペースと反対がわの口縁に、閉縮する拡大翼の先端部を上記待機スペース内に案内するための案内板を該待機スペース内から保持枠外へ突出状態に配設し、
上記保持枠に、該保持枠の回転を土圧により抑制するため、回転方向に受圧面を向けた土圧受圧板を突設した、請求項1、2、3、4のいずれかに記載の流体圧式拡大ヘッド。



The expansion blade closing and holding device has an annular holding frame that is rotatably supported about the rod axis on the head rod in a positional relationship that can surround and hold the tip of the expanding blade when closed.
The holding frame opens a guide port on the peripheral surface thereof where the tip of the enlarged blade can be moved in and out, and communicates in the holding frame with the standby space facing the guide port and the standby space in the rotation direction. And it has an enlarged blade tip holding space that does not face the guide port,
A guide plate for guiding the tip of the expanding wing to be closed into the waiting space is provided outside the holding frame on the opposite edge of the holding space to the opposite edge of the holding space. Arranged in a protruding state,
The fluid according to any one of claims 1, 2, 3, and 4, wherein an earth pressure receiving plate having a pressure receiving surface facing the rotation direction is provided on the holding frame so as to suppress rotation of the holding frame by earth pressure. Pressure expansion head.



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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008308819A (en) * 2007-06-12 2008-12-25 Sumisho Tekko Hanbai Kk Device for confirming enlargement and opening of enlarging blade in enlarging head
JP2010236240A (en) * 2009-03-31 2010-10-21 Sumisho Tekko Hanbai Kk Expansion verification method of expanding/contracting expansion head by earth pressure
JP2014114587A (en) * 2012-12-10 2014-06-26 Daiwa Kiko Kk Hydraulic cylinder type enlarged head
CN107090818A (en) * 2017-05-05 2017-08-25 中国石油大学(华东) Drill bit power-assisted jack-up unit shoe
CN110847825A (en) * 2019-10-31 2020-02-28 山东科技大学 Advancing type full-automatic controllable reducing pressure relief connecting rod drill bit device and using method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008308819A (en) * 2007-06-12 2008-12-25 Sumisho Tekko Hanbai Kk Device for confirming enlargement and opening of enlarging blade in enlarging head
JP2010236240A (en) * 2009-03-31 2010-10-21 Sumisho Tekko Hanbai Kk Expansion verification method of expanding/contracting expansion head by earth pressure
JP2014114587A (en) * 2012-12-10 2014-06-26 Daiwa Kiko Kk Hydraulic cylinder type enlarged head
CN107090818A (en) * 2017-05-05 2017-08-25 中国石油大学(华东) Drill bit power-assisted jack-up unit shoe
CN107090818B (en) * 2017-05-05 2019-06-21 中国石油大学(华东) Drill bit power-assisted jack-up unit shoe
CN110847825A (en) * 2019-10-31 2020-02-28 山东科技大学 Advancing type full-automatic controllable reducing pressure relief connecting rod drill bit device and using method thereof

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