JP5244539B2 - Cylinder advancing / retracting type expansion head by excavation work rod forward / reverse rotation - Google Patents
Cylinder advancing / retracting type expansion head by excavation work rod forward / reverse rotation Download PDFInfo
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本願発明は、掘削スクリューロッド、掘削撹拌ロッド等の掘削作業ロッドの下端部に接続される拡大ヘッドであって、１系統の圧力流体流路から流体圧シリンダへの圧力流体供給を、上記掘削作業ロッドの正逆回転により切換えて、流体圧シリンダを進出、後退駆動させ、それにより拡大翼を拡開、閉縮させるタイプの拡大ヘッドに関する。 The present invention is an enlarged head connected to a lower end portion of a drilling work rod such as a drilling screw rod, a drilling agitation rod, etc., and supplying the pressure fluid from one system pressure fluid flow path to the fluid pressure cylinder The present invention relates to an expansion head of a type that is switched by forward and reverse rotation of a rod to advance and retract a fluid pressure cylinder, thereby expanding and closing an expansion blade.
従来、このタイプの拡大ヘッドとして、ヘッドロッド内に流体圧シリンダを内蔵すると共に、上記掘削作業ロッドに、上記シリンダに圧力流体を供給すべき１系統の流体供給路を縦通し、上記ヘッドロッドの外周面に、上記流体圧シリンダの進退駆動により拡開、閉縮される拡大翼を設けた構成において、さらに、上記ヘッドロッド内に、上記１系統流体流路から上記流体圧シリンダのピストン側スペース又はロッド側スペースへ圧力流体供給を切換えるべき切換弁を内装すると共に、該切換弁の切換作動ピンをヘッドロッド外周面から外部に突出させ、一方、上記ヘッドロッド外周面に、ヘッドロッド逆回転時に上記切換作動ピンを従動させるべき駆動カムを有するリングを小角度自由回転できる関係で被嵌すると共に、該リングに、逆回転時に該リングを土圧により静止状態におくべき土圧板を突設し、かくして上記掘削作業ロッド、それに付随するヘッドロッドを逆回転させた時、上記土圧板により相対的に静止状態におかれたリングが、その駆動カムにより上記切換作動ピンを従動させて上記切換弁を切換える構造の拡大ヘッドが提案された。 Conventionally, as an expansion head of this type, a fluid pressure cylinder is built in the head rod, and a single fluid supply path for supplying pressure fluid to the cylinder is vertically passed through the excavation work rod. In the configuration in which the outer peripheral surface is provided with an enlarged blade that is expanded and closed by advancing and retracting the fluid pressure cylinder, a space on the piston side of the fluid pressure cylinder from the one-system fluid flow path is further provided in the head rod. Alternatively, a switching valve for switching the supply of pressure fluid to the rod side space is built in, and the switching operation pin of the switching valve is projected from the outer surface of the head rod to the outside. A ring having a drive cam to be driven by the switching operation pin is fitted so that it can freely rotate by a small angle, and the ring is reversely rotated. Sometimes the earth pressure plate that should keep the ring stationary due to earth pressure protrudes, and thus when the excavation work rod and the head rod associated therewith are reversely rotated, the earth pressure plate is kept relatively stationary. There has been proposed an enlarged head having a structure in which a ring drives the switching operation pin by its drive cam to switch the switching valve.
しかし、上記の従来例では、切換弁の切換作動が、ヘッドロッドの逆回転時に周辺土砂の土圧を土圧板に受けて土圧板及びリングを相対的に静止状態におくことに依存するものであるが、ヘッドロッドの逆回転時に周辺土砂の性状が軽すぎたり、礫等をかみ込んだりした場合、土圧板及びリングを相対的に十分な静止状態におくことができず、その結果、駆動カムにより切換作動ピンを切換弁切換位置まで作動させることができない場合が生じていた。 However, in the above-mentioned conventional example, the switching operation of the switching valve depends on the earth pressure of the surrounding earth and sand being received by the earth pressure plate when the head rod rotates in the reverse direction, and the earth pressure plate and the ring are relatively stationary. However, if the properties of the surrounding earth and sand are too light or bite gravel during reverse rotation of the head rod, the earth pressure plate and ring cannot be kept relatively stationary, resulting in driving. In some cases, the switching operation pin cannot be operated to the switching valve switching position by the cam.
本願発明は、流体圧シリンダへの圧力流体供給を切換えるための切換弁の切換動作を、周辺土砂の状況に影響されずに確実に行うことができるように改良することを課題とする。 This invention makes it a subject to improve so that the switching operation of the switching valve for switching the pressure fluid supply to a fluid pressure cylinder can be performed reliably, without being influenced by the condition of surrounding earth and sand.
上記課題解決の手段として、本願発明は、
掘削作業ロッドの下端部に、ヘッドロッドの上端部を接続し、上記ヘッドロッド内に流体圧シリンダを内蔵すると共に、上記掘削作業ロッドに上記シリンダに圧力流体を供給すべき１系統の流体流路を縦通し、上記ヘッドロッドの外周面に、上記流体圧シリンダの進退駆動により拡縮される拡大翼を設けた構成において、
上記掘削作業ロッドの下端部に形成された駆動側継手に、上記ヘッドロッドの上端部に形成された従動側継手を、小角度範囲だけ互に自由回転できる関係で、駆動側の正逆回転を従動側へ伝達可能に嵌合して接続し、
上記従動側継手内に、上記１系統の流体流路からの圧力流体供給を上記流体圧シリンダの進、退駆動に切換える切換弁を内装し、
上記駆動側継手に上記切換弁の切換駆動手段を設け、該駆動手段は、駆動側継手の正回転時に上記切換弁に対し無作動であるが、上記ヘッドロッドを掘削孔底部に圧接した状態での上記駆動側継手の逆回転時に、その自由逆回転の過程において上記切換弁を従動させて切換を行う関係にある、
掘削作業ロッド正逆回転によるシリンダ進退切換式拡大ヘッドを提案する。
As means for solving the above problems, the present invention
The upper end portion of the head rod is connected to the lower end portion of the excavation work rod, a fluid pressure cylinder is built in the head rod, and a fluid flow path for supplying pressure fluid to the excavation work rod to the cylinder In a configuration in which an enlarged wing is provided on the outer peripheral surface of the head rod to be expanded and contracted by the forward and backward drive of the fluid pressure cylinder.
The drive side joint formed on the lower end portion of the excavation work rod and the driven side joint formed on the upper end portion of the head rod can be rotated in the forward and reverse directions on the drive side so that they can freely rotate each other within a small angle range. Fitted to connect to the driven side and connected,
A switching valve for switching the pressure fluid supply from the fluid flow path of the one system to advance and retract drive of the fluid pressure cylinder is provided in the driven joint.
The drive side joint is provided with a switching drive means for the switching valve, and the drive means is inoperative with respect to the switch valve when the drive side joint rotates forward, but in a state where the head rod is pressed against the bottom of the excavation hole. At the time of reverse rotation of the drive side joint, the switching valve is driven in the process of the free reverse rotation to perform switching.
A cylinder advancing / retracting type expansion head with forward / reverse rotation of excavation work rod is proposed.
本願発明によれば、掘削作業ロッド下端部の駆動側継手内にヘッドロッド上端部の従動側継手を回転伝達可能に嵌合接続したから、掘削孔内の周辺土砂の性状や礫等のかみ込みの影響を全く受けることがなくなり、しかも掘削作業ロッドの逆回転時に、ヘッドロッド下端（通常掘削刃）を掘削孔の内底面に圧接することにより従動側継手を確実に静止状態におくことができ、それにより駆動側継手の切換駆動手段により従動側継手内の切換弁を確実に従動させて切換弁の切換を所期どおりに作動させることができるのである。 According to the present invention, since the driven side joint at the upper end of the head rod is fitted and connected to the drive side joint at the lower end of the excavation work rod so as to be able to transmit rotation, the properties of the surrounding earth and the gravel etc. in the excavation hole are included. In addition, when the excavation rod is rotated in the reverse direction, the lower end of the head rod (usually the excavation blade) is pressed against the inner bottom surface of the excavation hole, so that the driven joint can be reliably kept stationary. As a result, the switching valve in the driven joint can be reliably driven by the switching driving means of the driving joint so that the switching of the switching valve can be operated as expected.
以下図面を参照して本発明の実施例について詳述する。
図１において、掘削スクリューロッド（１）のロッド（２）下端部に、拡大ヘッド（３）の中空ヘッドロッド（４）を流路切換兼用継手（５）を介して同一軸線上に接続し、該ヘッドロッド（４）外周面に一対の拡大翼（６）、（６）を設けると共に、ヘッドロッド（４）内部に、上記拡大翼（６）、（６）を拡縮すべき、本例では水圧シリンダ（７）を同心的に固心し、又掘削スクリューロッド（１）内に、１系統の圧力水供給管（１５）を縦通してある。
Embodiments of the present invention will be described in detail below with reference to the drawings.
In FIG. 1, the hollow head rod (4) of the expansion head (3) is connected to the lower end of the rod (2) of the drilling screw rod (1) on the same axis via the flow path switching joint (5). In the present example, a pair of expansion blades (6) and (6) are provided on the outer peripheral surface of the head rod (4), and the expansion blades (6) and (6) should be expanded and contracted inside the head rod (4). A hydraulic cylinder (7) is concentrically fixed, and a pressure water supply pipe (15) is vertically passed through the drilling screw rod (1).
上記拡大翼（６）、（６）は、ヘッドロッド（４）外周面に突設されたブラケット（８）、（８）に、基端部をピン（９）、（９）により上下に揺動自在に支持すると共に、上記水圧シリンダ（７）のピストン（１０）から下方へ突出されたピストンロッド（１１）の突出端に端板（１２）を固定し、該端板（１２）の両端にリンク（１３）、（１３）の一端を回転自在に連結し、他端を上記拡大翼（６）、（６）の中間部にピン（１４）、（１４）により連結してある。 The expansion wings (6) and (6) are pivoted up and down by brackets (8) and (8) projecting on the outer peripheral surface of the head rod (4) by pins (9) and (9). The end plate (12) is fixed to the projecting end of the piston rod (11) projecting downward from the piston (10) of the hydraulic cylinder (7) while being supported movably, and both ends of the end plate (12). One end of the links (13) and (13) is rotatably connected to the other end, and the other end is connected to the intermediate portion of the enlarged wings (6) and (6) by pins (14) and (14).
上記水圧シリンダ（７）を進退駆動させるべく圧力水を切換え供給する水圧回路は図３（イ）に示す通りである。水圧ユニット（１６）には、水圧ポンプ（１７）、圧力水吐出ライン（Ａ）の異常高圧回避用リリーフ弁（１８）、送水弁（１９）、及び拡大翼（６）の拡開度を決定する圧力水の流量計（２０）を設けてある。 A hydraulic circuit for switching and supplying pressure water to drive the hydraulic cylinder (7) forward and backward is as shown in FIG. In the water pressure unit (16), the opening of the water pressure pump (17), the relief valve (18) for avoiding abnormally high pressure in the pressure water discharge line (A), the water supply valve (19), and the expansion opening of the expansion blade (6) are determined. A flow meter (20) for pressure water is provided.
流路切換弁（２１）から水圧シリンダ（７）への圧力水流路（Ｂ）、（Ｃ）間に双方の流路圧にて作動するパイロットチェッキ弁（２２）、（２３）を接続してある。上記切換弁（２１）の一側には、常時はバネにより先端従動部を弾性的に突出し、バネに抗して従動部を押すと後退して上記切換弁（２１）の流路切換を行う弾性進退型切換作動ピン（２４）を突出してある。（２５）はピストン（１０）の昇降によりシリンダ（７）から押出される水を切換弁（２１）、Ｄ流路を経て地中に放出するチェッキ弁である。 Pilot check valves (22) and (23) operating at both flow path pressures are connected between the pressure water flow paths (B) and (C) from the flow path switching valve (21) to the hydraulic cylinder (7). is there. At one side of the switching valve (21), the tip driven portion is normally elastically projected by a spring, and when the driven portion is pushed against the spring, the switching valve (21) is moved backward to switch the flow path. An elastic advance / retreat type switching operation pin (24) is projected. (25) is a check valve that discharges water pushed out from the cylinder (7) by raising and lowering the piston (10) into the ground via the switching valve (21) and the D channel.
上記のような水圧回路における切換弁（２１）、パイロットチェッキ弁（２２）、（２３）、チェッキ弁（２５）を上記流路切換兼用継手（５）内に内装してある。上記継手（５）は、図１に示すように掘削スクリューのロッド(２)下端部に接続された円筒状の駆動側継手（２６）と、上記ヘッドロッド（４）上端部に形成された円筒状従動側継手（２７）とからなり、まず両者（２６）、（２７）の回転伝達機構について説明する。 The switching valve (21), the pilot check valves (22), (23), and the check valve (25) in the water pressure circuit as described above are incorporated in the flow path switching joint (5). As shown in FIG. 1, the joint (5) includes a cylindrical drive side joint (26) connected to the lower end of the rod (2) of the drilling screw and a cylinder formed at the upper end of the head rod (4). The rotation transmission mechanism of the two (26) and (27) will be described first.
図２（イ）、（ロ）に示すように、駆動側継手（２６）の内周面に、本例では４５度の角度範囲にわたる幅のキー溝（２８）を形成し、従動側継手（２７）の外周面に、上記キー溝（２８）より幅のせまいキー（２９）を、上記キー溝（２８）内に係合した状態で、固定し、それにより両継手（２６）、（２７）を約２５度の範囲（ｄ１）で互に自由に回転できる関係で、駆動側から従動側へ正逆回転伝達可能に嵌合してある。 As shown in FIGS. 2 (a) and 2 (b), on the inner peripheral surface of the drive side joint (26), in this example, a key groove (28) having a width over an angle range of 45 degrees is formed, and the driven side joint ( 27) A narrow key (29) having a width wider than that of the key groove (28) is fixed to the outer peripheral surface of the key groove (28) while being engaged with the outer surface of the key groove (28), whereby both joints (26), (27 ) In a range (d 1 ) of about 25 degrees so that they can freely rotate with each other so that forward and reverse rotation can be transmitted from the drive side to the driven side.
上記切換弁（２１）の切換駆動手段は次のようである。図２（ハ）、（ニ）に示すように、駆動側継手（２６）の内周面に、本例では３０度の角度範囲に開く横断面台形の凹陥カム（３０）を形成し、一方従動側継手（２７）内に内装された切換弁（２１）の弾性進退型切換作動ピン（２４）を、従動側継手（２７）をほぼ切線方向へ摺動自在に貫通して、そのピン先端従動部を凹陥カム（３０）内に弾性的に突出させている。 The switching drive means of the switching valve (21) is as follows. As shown in FIGS. 2 (a) and (d), a trapezoidal concave cam (30) having a trapezoidal cross section that opens in an angle range of 30 degrees in this example is formed on the inner peripheral surface of the drive side joint (26). An elastic advance / retreat type switching operation pin (24) of the switching valve (21) provided in the driven side joint (27) passes through the driven side joint (27) so as to be slidable substantially in the direction of the cut line, and the tip of the pin The driven portion is elastically projected into the recessed cam (30).
この場合、上記切換ピン（２４）のカム（３０）内への突出従動部と、上記キー（２９）とは、軸方向からみて同一位置で上下に位置している。又上記切換ピン（２４）の従動部が上記カム（３０）内で移動できる範囲（ｄ２）は、上記キー（２９）の自由回転範囲（ｄ１）（約２５度）より狭い約１２度に設計してある。 In this case, the projecting driven portion of the switching pin (24) into the cam (30) and the key (29) are positioned vertically at the same position as viewed from the axial direction. The range (d 2 ) in which the driven portion of the switching pin (24) can move within the cam (30) is about 12 degrees narrower than the free rotation range (d 1 ) (about 25 degrees) of the key (29). Designed.
従って、上記キー（２９）が、図２（イ）のようにキー溝（２８）の逆回転がわ側端に位置した状態で、駆動側継手（２６）を（ｄ１）だけ逆回転させて同図（ロ）のように上記キー（２９）をキー溝（２８）の正回転がわ側端に移動させたときは、上記切換ピン（２４）は、同図（ニ）に示すように上記カム（３０）に押されて後退しつつ、さらにカム（３０）から離脱して駆動側継手（２６）の円筒内周面にピン（２４）従動部を接する位置まで十分に後退することとなる。 Accordingly, the drive joint (26) is rotated reversely by (d 1 ) while the key (29) is positioned at the opposite end of the keyway (28) as shown in FIG. 2 (a). When the key (29) is moved to the opposite end of the keyway (28) as shown in FIG. 7 (b), the switching pin (24) is moved as shown in FIG. To the position where the pin (24) driven portion comes into contact with the cylindrical inner peripheral surface of the drive side joint (26) while being pushed back by the cam (30) and further retracted. It becomes.
上例の作用を操作とともに次に説明する。拡大翼（６）、（６）を閉縮した状態で、掘削スクリューロッド（１）を正回転させ、その下端の掘削ヘッド（３１）により地盤に縦孔掘削を開始する。 The operation of the above example will be described next together with the operation. With the expansion wings (6) and (6) closed, the excavation screw rod (1) is rotated forward, and the excavation head (31) at the lower end thereof starts excavation of a vertical hole in the ground.
所定深さまで掘削し、そこで拡大掘削を行う場合は、図３（イ）において、水圧ユニット（１６）の送水弁（１９）を開き、水圧ポンプ（１７）を始動して圧力水を流路（Ａ）を経て切換弁（２１）から流路（Ｂ）を経て水圧シリンダ（７）のロッド側スペースに送ってピストン（１０）を上昇させ、それにより拡大翼（６）、（６）を拡開させる。それと同時に、シリンダ（７）のピストン側スペースに残っている圧力水を流路（Ｃ）、切換弁（２１）、流路（Ｄ）を経てチェッキ弁（２５）から地中に放出する。 When excavating to a predetermined depth and performing an expanded excavation there, in FIG. 3 (a), the water supply valve (19) of the hydraulic unit (16) is opened, the hydraulic pump (17) is started and the pressure water is flowed ( A) is sent from the switching valve (21) to the rod side space of the hydraulic cylinder (7) through the flow path (B) to raise the piston (10), thereby expanding the expansion blades (6) and (6). Let it open. At the same time, the pressure water remaining in the piston side space of the cylinder (7) is discharged into the ground from the check valve (25) through the flow path (C), the switching valve (21) and the flow path (D).
拡大翼（６）、（６）は、上記流量計（２０）で設定された圧力水量が送水されたとき、同図（ハ）に示す位置まで拡開し、そこで送水弁（１９）が閉じられる。 The enlarged blades (6) and (6) are expanded to the position shown in (c) when the amount of pressure water set by the flow meter (20) is supplied, and the water supply valve (19) is closed there. It is done.
拡大翼（６）、（６）が拡開した状態で、掘削スクリューロッド（１）の正回転により拡大掘削を行い、拡大掘削孔へのセメントミルクの注入、撹拌により拡大球根の造成を行う。 In a state where the expansion blades (6) and (6) are expanded, the excavation screw rod (1) is rotated in the forward direction to perform the expansion excavation, and cement milk is injected into the expansion excavation hole and the expansion bulb is formed by stirring.
拡大翼（６）、（６）を閉縮して掘削スクリューロッド（１）を引き抜く場合は、まずヘッドロッド（４）下端の掘削ヘッド（３１）を掘削孔内底面に圧接してヘッドロッド（４）を静止状態に保持し、その状態で掘削スクリューロッド（１）を逆回転させると、駆動側継手（２６）が図２（イ）の状態から自由回転範囲（ｄ１）を逆回転して同図（ロ）の状態に至り、その間に駆動カム（３０）が同図（ハ）の位置から切換作動ピン（２４）を後退させつつ同図（ニ）の位置に移動して切換作動ピン（２４）を所定の切換位置に後退させ、それにより切換弁（２１）を図３（ハ）の状態に切換える。 When the expansion blades (6), (6) are closed and the drilling screw rod (1) is pulled out, the head rod (4) is first pressed against the bottom surface of the drilling hole to contact the head rod (4). 4) When holding the stationary state and rotating the excavating screw rod (1) in the reverse state, the drive side joint (26) reversely rotates the free rotation range (d 1 ) from the state shown in FIG. In the meantime, the state shown in (b) is reached, and during that time, the drive cam (30) moves from the position shown in (c) to the position shown in FIG. The pin (24) is retracted to a predetermined switching position, thereby switching the switching valve (21) to the state shown in FIG.
そこで、送水弁（１９）を開いて圧力水を、Ａ流路、切換弁（２１）、Ｃ流路を経てシリンダ（７）のピストン側スペースに送ってピストン（１０）を降下させ、拡大翼（６）、（６）を閉縮する。シリンダ（７）のロッド側スペースに残されていた圧力水は流路（Ｂ）、切換弁（２１）、流路（Ｄ）を経てチェッキ弁（２５）から地中に放出される。拡大翼（６）、（６）が所定位置に閉縮したら掘削スクリューロッド（１）を地上に引き上げる。 Therefore, the water supply valve (19) is opened and the pressure water is sent to the piston side space of the cylinder (7) through the A channel, the switching valve (21), and the C channel, and the piston (10) is lowered to expand the wing. (6) and (6) are closed. The pressure water remaining in the rod side space of the cylinder (7) is discharged into the ground from the check valve (25) through the flow path (B), the switching valve (21), and the flow path (D). When the expansion wings (6) and (6) are closed to a predetermined position, the excavation screw rod (1) is pulled up to the ground.
図４（イ）、（ロ）は他の実施例を示し、（イ）図の例は、凹陥カム（３０ａ）を横断面コ字状とし、切換作動ピン（２４ａ）の先端従動部を本体に対し回転自在に軸支すると共に、バネにより上記凹陥カム（３０ａ）内に起立状態で突出するように保持し、駆動側継手（２６ａ）の逆回転時に、凹陥カム（３０ａ）の側壁にて切換ピン（２４ａ）先端従動部を回転させ、それにより切換弁の切換作動を行うようにし、他の構造は図１〜３と実質的に同一である。 4 (a) and 4 (b) show other embodiments. In the example of FIG. 4 (a), the recessed cam (30a) has a U-shaped cross section, and the tip follower of the switching operation pin (24a) is the main body. And is supported by a spring so as to protrude into the recessed cam (30a) in a standing state, and at the side wall of the recessed cam (30a) when the drive side joint (26a) rotates backward. The tip follower of the switching pin (24a) is rotated so that the switching operation of the switching valve is performed, and the other structure is substantially the same as FIGS.
（ロ）図の例は、凹陥カム（３０ｂ）を横断面コ字状とし、切換作動ピン（２４ｂ）の先端従動部をバネにより本体から横方向に弾性的に突出させ、駆動側継手（２６ｂ）の逆回転時にコ字状カム（３０ｂ）の側壁にてピン先端従動部をバネに抗して押して後退させ、それにより切換弁の切換作動を行うようにし、他の構造は図１〜３と実質的に同一の例である。但し、本例の場合切換ピン（２４ｂ）の先端従動部のカム（３０ｂ）内での移動可能範囲（ｄ２）は、上記自由回転範囲（ｄ１）と等しくしてある。 (B) In the example of the figure, the recessed cam (30b) has a U-shaped cross section, and the tip driven portion of the switching operation pin (24b) is elastically projected laterally from the main body by a spring, and the drive side joint (26b ), The pin tip follower is pushed against the spring against the spring at the side wall of the U-shaped cam (30b) so that the switching operation of the switching valve is performed. Is substantially the same example. However, in this example, the movable range (d 2 ) within the cam (30b) of the tip follower of the switching pin (24b) is made equal to the free rotation range (d 1 ).
１ 掘削スクリューロッド
４ ヘッドロッド
６ 拡大翼
７ 水圧シリンダ
２１ 流路切換弁
２４、２４ａ、２４ｂ 切換作動ピン
２６、２６ａ、２６ｂ 駆動側継手
２７、２７ａ、２７ｂ 従動側継手
３０、３０ａ、３０ｂ 凹陥カム
DESCRIPTION OF SYMBOLS 1 Drilling screw rod 4 Head rod 6 Expansion blade 7
Claims (1)
上記掘削作業ロッドの下端部に形成された駆動側継手に、上記ヘッドロッドの上端部に形成された従動側継手を、小角度範囲だけ互に自由回転できる関係で、駆動側の正逆回転を従動側へ伝達可能に嵌合して接続し、
上記従動側継手内に、上記１系統の流体流路からの圧力流体供給を上記流体圧シリンダの進、退駆動に切換える切換弁を内装し、
上記駆動側継手に上記切換弁の切換駆動手段を設け、該駆動手段は、駆動側継手の正回転時に上記切換弁に対し無作動であるが、上記ヘッドロッドを掘削孔底部に圧接した状態での上記駆動側継手の逆回転時に、その自由逆回転の過程において上記切換弁を従動させて切換を行う関係にある、
掘削作業ロッド正逆回転によるシリンダ進退切換式拡大ヘッド。 The upper end portion of the head rod is connected to the lower end portion of the excavation work rod, a fluid pressure cylinder is built in the head rod, and a fluid flow path for supplying pressure fluid to the excavation work rod to the cylinder In a configuration in which an enlarged wing is provided on the outer peripheral surface of the head rod to be expanded and contracted by the forward and backward drive of the fluid pressure cylinder.
The drive side joint formed on the lower end portion of the excavation work rod and the driven side joint formed on the upper end portion of the head rod can be rotated in the forward and reverse directions on the drive side so that they can freely rotate each other within a small angle range. Fitted to connect to the driven side and connected,
A switching valve for switching the pressure fluid supply from the fluid flow path of the one system to advance and retract drive of the fluid pressure cylinder is provided in the driven joint.
The drive side joint is provided with a switching drive means for the switching valve, and the drive means is inoperative with respect to the switch valve when the drive side joint rotates forward, but in a state where the head rod is pressed against the bottom of the excavation hole. At the time of reverse rotation of the drive side joint, the switching valve is driven in the process of the free reverse rotation to perform switching.
Cylinder advancing / retracting type expansion head by excavation work rod forward / reverse rotation.
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| JP2008273915A JP5244539B2 (en) | 2008-10-24 | 2008-10-24 | Cylinder advancing / retracting type expansion head by excavation work rod forward / reverse rotation |
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| JP2008273915A JP5244539B2 (en) | 2008-10-24 | 2008-10-24 | Cylinder advancing / retracting type expansion head by excavation work rod forward / reverse rotation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105332658A (en) * | 2015-11-10 | 2016-02-17 | 中信重工机械股份有限公司 | Telescopic bit device for submarine pile hole drill |
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| CN102561326A (en) * | 2012-03-19 | 2012-07-11 | 董兰田 | Three-branch single-cylinder hydraulic bidirectional expansion-extrusion device |
| CN109853524B (en) * | 2019-01-14 | 2021-05-04 | 江苏东合南岩土科技股份有限公司 | Construction method of expanded head stiff cement soil composite special-shaped pile |
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| JP2006009540A (en) * | 2004-06-23 | 2006-01-12 | Sanwa Kizai Co Ltd | Hydraulic pressure sensor type extending head |
| JP4122502B2 (en) * | 2006-03-13 | 2008-07-23 | 住友商事株式会社 | Enlarged wing closure holding device for fluid pressure cylinder type expansion head |
| JP5093767B2 (en) * | 2007-02-19 | 2012-12-12 | 三和機材株式会社 | Enlarged head with fluid pressure and single flow path switching by forward / reverse rotation |
| JP2008202375A (en) * | 2007-02-19 | 2008-09-04 | Sanwa Kizai Co Ltd | Enlarging head of fluid pressure one flow passage switching type by striker system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105332658A (en) * | 2015-11-10 | 2016-02-17 | 中信重工机械股份有限公司 | Telescopic bit device for submarine pile hole drill |
| CN105332658B (en) * | 2015-11-10 | 2017-11-10 | 中信重工机械股份有限公司 | A kind of expansion bit device for seabed Post hole driller |
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