JPH11315538A - Method and device for adjusting percussion force of hydraulic drop hammer - Google Patents
Method and device for adjusting percussion force of hydraulic drop hammerInfo
- Publication number
- JPH11315538A JPH11315538A JP12343698A JP12343698A JPH11315538A JP H11315538 A JPH11315538 A JP H11315538A JP 12343698 A JP12343698 A JP 12343698A JP 12343698 A JP12343698 A JP 12343698A JP H11315538 A JPH11315538 A JP H11315538A
- Authority
- JP
- Japan
- Prior art keywords
- ram
- falling speed
- casing
- falling
- hydraulic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、油圧シリンダでラ
ムを上昇させ、油圧の解放又はラムの落下方向に油圧力
を加えることにより、ラムを落下させて、ラムの打撃力
により杭を打ち込む油圧ドロップハンマの打撃力調整装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic system in which a ram is lifted by a hydraulic cylinder and hydraulic pressure is released or hydraulic pressure is applied in a falling direction of the ram to drop the ram and drive a pile by a striking force of the ram. The present invention relates to a hitting force adjusting device for a drop hammer.
【０００２】[0002]
【従来の技術】油圧ドロップハンマの打撃力は、ラムの
落下高さを調整することにより、杭種、杭径に合わせ適
正な打撃力に調整する。この調整手段として、作業者が
手動でラムの上昇時間をタイマーで制御する方法や、実
公平３−５２２５９号公報に示されるように、ケーシン
グ内にラムの上昇位置を計測する複数個のセンサを上下
方向に配設し、複数個のセンサのいずれかを選択する開
閉器を運転室に設け、油圧シリンダの上部室と下部室へ
圧油の供給を切換える切換弁の開閉をセンサと連動さ
せ、地盤の状態によって杭の一打撃当りの貫入量等を運
転者が考慮して、ラムの上昇位置を適宜に指令できる打
撃力調整装置が用いられている。2. Description of the Related Art The impact force of a hydraulic drop hammer is adjusted to an appropriate impact force according to a pile type and a pile diameter by adjusting a drop height of a ram. As this adjusting means, a method in which an operator manually controls the rising time of the ram with a timer, or as shown in Japanese Utility Model Publication No. 3-52259, a plurality of sensors for measuring the rising position of the ram in the casing are provided. Arranged vertically, a switch for selecting one of a plurality of sensors is provided in the cab, and the opening and closing of a switching valve that switches the supply of pressure oil to the upper chamber and the lower chamber of the hydraulic cylinder is linked with the sensor, A striking force adjusting device capable of appropriately instructing the ascending position of the ram is used in consideration of the driver's consideration of the amount of penetration per stroke and the like depending on the state of the ground.
【０００３】[0003]
【発明が解決しようとする課題】しかし、手動によるタ
イマー制御は、作動状況に関係なく決めた時間でラムの
上昇ストロークが設定されるので自動補正ができない。
また、上述の打撃力調整装置は、複数個のセンサやこれ
らを選択する開閉器の数が多く、複雑な構造で取付けの
手間や時間がかかり、コスト的に不利である。However, in the manual timer control, the automatic correction cannot be performed because the rising stroke of the ram is set at the determined time regardless of the operating condition.
In addition, the above-described impact force adjusting device has a large number of sensors and switches for selecting these sensors, and has a complicated structure, requires much labor and time for mounting, and is disadvantageous in cost.
【０００４】そこで本発明は、簡単な構造でラムの打撃
力の自動補正ができる油圧ドロップハンマの打撃力調整
方法及び装置を提供することを目的としている。Accordingly, an object of the present invention is to provide a method and an apparatus for adjusting the impact force of a hydraulic drop hammer that can automatically correct the impact force of a ram with a simple structure.
【０００５】[0005]
【課題を解決するための手段】上記した目的を達成する
ため、本発明は、請求項１の打撃力調整方法では、ケー
シング内に配設したラムを、油圧シリンダで上昇、落下
させ、前記ケーシング内に設けたセンサによりラムの移
動を計測して、ラムの上昇ストロークを制御することに
よりラムの打撃力を調整する油圧ドロップハンマの打撃
力調整方法において、前記ケーシング内に１個設けたセ
ンサにより、前記ラムに形成した一定長さの切り欠き部
の落下時間を計測し、該落下時間から前記ラムの落下速
度を算出し、該落下速度と設定落下速度とを比較演算し
て、前記ラムの落下速度を設定落下速度とするために、
前記ラムの上昇ストロークを制御することを特徴とし、
請求項２の打撃力調整装置では、ケーシング内に配設し
たラムを、油圧シリンダで上昇、落下させ、前記ケーシ
ング内に設けたセンサによりラムの移動を計測して、ラ
ムの上昇ストロークを制御することによりラムの打撃力
を調整する油圧ドロップハンマの打撃力調整装置におい
て、前記ケーシング内に前記センサを１個設け、前記ラ
ムに、前記センサが計測する一定長さの切り欠き部を形
成し、前記センサが計測する切り欠き部の落下時間から
前記ラムの落下速度を算出し、該落下速度と設定落下速
度とを比較演算して、前記ラムの落下速度を設定落下速
度とするために、前記ラムの上昇ストロークを制御する
制御部を設けたことを特徴としている。According to a first aspect of the present invention, there is provided a method for adjusting a striking force, wherein a ram disposed in a casing is raised and dropped by a hydraulic cylinder. In the method of adjusting the impact force of the hydraulic drop hammer, which measures the movement of the ram with a sensor provided therein and controls the ascent stroke of the ram by controlling the ascending stroke of the ram, the sensor provided in the casing is provided with one sensor. Measuring the falling time of the notch having a fixed length formed in the ram, calculating the falling speed of the ram from the falling time, comparing the falling speed with a set falling speed, and calculating the falling speed of the ram. To set the falling speed to the set falling speed,
Controlling the rising stroke of the ram,
According to the striking force adjusting device of the second aspect, the ram disposed in the casing is raised and dropped by a hydraulic cylinder, and the movement of the ram is measured by a sensor provided in the casing to control the ram upward stroke. In the hitting force adjusting device for a hydraulic drop hammer that adjusts the hitting force of the ram, one sensor is provided in the casing, and the ram is formed with a cutout having a fixed length measured by the sensor. The drop speed of the ram is calculated from the drop time of the cutout portion measured by the sensor, the drop speed is compared with a set drop speed, and the drop speed of the ram is set to the set drop speed. A control unit for controlling a rising stroke of the ram is provided.
【０００６】[0006]
【発明の実施の形態】以下、本発明を、図面に示す実施
形態例に基づいて、さらに詳細に説明する。油圧ドロッ
プハンマ１は、密閉状の円筒形ケーシング２内に、油圧
シリンダ３と、該油圧シリンダ３で吊下したラム４とを
配設し、油圧装置５から油圧シリンダ３への圧油を切換
弁６を介して給排することによりラム４を上昇、落下さ
せ、ラム４の打撃力によって杭（図示せず）を地中に打
ち込む。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings. The hydraulic drop hammer 1 has a hydraulic cylinder 3 and a ram 4 suspended by the hydraulic cylinder 3 disposed in a closed cylindrical casing 2, and switches hydraulic oil from a hydraulic device 5 to the hydraulic cylinder 3. The ram 4 is raised and dropped by supplying and discharging through the valve 6, and a stake (not shown) is driven into the ground by the striking force of the ram 4.
【０００７】前記ケーシング２は、その内壁に、ケーシ
ング軸線方向の凸条７を周方向に４ケ所等間隔に形成
し、前記ラム４は、ケーシング２の内径よりもやや小径
に形成され、その外周に、前記各凸条７に係合する凹溝
８を軸線方向に４ケ所等間隔に形成しており、これによ
り、前記ラム４は、凸条７と凹溝８との係合によりガイ
ドされて、杭との角度や地盤の影響に関係なくケーシン
グ２内をスムースに上下動する。The casing 2 has, on its inner wall, ridges 7 extending in the axial direction of the casing at four equally spaced locations in the circumferential direction. The ram 4 is formed to have a slightly smaller diameter than the inner diameter of the casing 2. In addition, concave grooves 8 engaging with each of the ridges 7 are formed at four equally spaced positions in the axial direction, whereby the ram 4 is guided by the engagement between the ridges 7 and the concave grooves 8. Therefore, the inside of the casing 2 moves up and down smoothly regardless of the angle with the pile and the influence of the ground.
【０００８】この油圧ドロップハンマ１には、ラム４の
打撃力を調整する打撃力調整装置９が設けられている。
該打撃力調整装置９は、制御部１０と、該制御部１０と
配線１１で接続された１個の近接スイッチ１２とを有
し、制御部１０と前記切換弁６とは配線１３で接続され
ている。[0008] The hydraulic drop hammer 1 is provided with a striking force adjusting device 9 for adjusting the striking force of the ram 4.
The striking force adjusting device 9 has a control unit 10 and one proximity switch 12 connected to the control unit 10 by a wiring 11. The control unit 10 and the switching valve 6 are connected by a wiring 13. ing.
【０００９】前記近接スイッチ１２は、前記ケーシング
２の内壁に設けられ、前記ラム４の上部外周に取付けら
れたプレート１４に形成された一定長さの切り欠き部１
４ａを計測するセンサとして作動する。尚、近接スイッ
チ１２の設置位置は、ラム４が落下する際の最下点に近
い位置のラム４上方が望ましい。The proximity switch 12 is provided on an inner wall of the casing 2 and has a cutout 1 of a predetermined length formed on a plate 14 attached to an upper outer periphery of the ram 4.
It operates as a sensor for measuring 4a. It is desirable that the proximity switch 12 be installed above the ram 4 at a position close to the lowest point when the ram 4 falls.
【００１０】制御部１０は、前記近接スイッチ１２が計
測する切り欠き部１４ａの下端から上端までの落下時間
から前記ラム４の落下速度を算出し、該落下速度と設定
落下速度とを比較演算して、前記ラム４の落下速度を設
定落下速度とするために、前記ラム４の上昇ストローク
を制御する。The control unit 10 calculates the falling speed of the ram 4 from the falling time from the lower end to the upper end of the notch 14a measured by the proximity switch 12, and compares the falling speed with the set falling speed. Then, the rising stroke of the ram 4 is controlled so that the falling speed of the ram 4 becomes the set falling speed.
【００１１】したがって、図２に示されるように、制御
部１０に、設定落下速度に対応するラム４の目標上昇ス
トロークを入力すると、制御部１０は、目標上昇ストロ
ークに到達するまでのラム４の上昇時間Ｔを算出する。
そして、打撃スイッチをＯＮにすると、制御部１０は、
切換弁６を上昇時間Ｔ分上昇に切換えて油圧シリンダ３
の下部室３ａに圧油を供給し、ラム４を上昇させ、上昇
時間Ｔ経過後下部室３ａの圧油を排出してラム４を落下
させる。Therefore, as shown in FIG. 2, when the target ascent stroke of the ram 4 corresponding to the set drop speed is input to the control unit 10, the control unit 10 controls the ram 4 to reach the target ascent stroke. The rise time T is calculated.
When the hit switch is turned on, the control unit 10
Switching the switching valve 6 to the rising time T, the hydraulic cylinder 3
The pressurized oil is supplied to the lower chamber 3a, the ram 4 is raised, and after the elapse of the rising time T, the pressurized oil in the lower chamber 3a is discharged and the ram 4 is dropped.
【００１２】近接スイッチ１２は、ラム４の切り欠き部
１４ａの下端から上端までの落下時間を計測し、制御部
１０は、計測された落下時間からラム４の落下速度と、
ラム４の重量から打撃エネルギーとを算出し、ラム４の
落下速度と設定落下速度とを比較演算する。制御部１０
は、計測値から算出したラム４の落下速度が設定落下速
度より早ければ、ラム４の上昇時間Ｔをｔ０分短くし、
ラム４の落下速度が設定落下速度より遅ければ、ラム４
の上昇時間Ｔをｔ０分長くする。これにより、ラム４の
上昇ストロークが制御される。The proximity switch 12 measures the falling time from the lower end to the upper end of the notch 14a of the ram 4, and the control unit 10 determines the falling speed of the ram 4 from the measured falling time,
The impact energy is calculated from the weight of the ram 4, and the falling speed of the ram 4 is compared with the set falling speed. Control unit 10
If the falling speed of the ram 4 calculated from the measured value is faster than the set falling speed, the rising time T of the ram 4 is shortened by t0 minutes,
If the falling speed of the ram 4 is lower than the set falling speed,
Is increased by t0 minutes. Thereby, the rising stroke of the ram 4 is controlled.
【００１３】したがって、１個の近接スイッチ１２をケ
ーシング２の内壁に設けるだけの簡単な構造で、ラム４
の打撃力を自動補正して、適正な打撃力によって杭を地
中に打ち込むことができる。Accordingly, the ram 4 has a simple structure in which only one proximity switch 12 is provided on the inner wall of the casing 2.
Automatically corrects the striking force, and the pile can be driven into the ground with an appropriate striking force.
【００１４】尚、前記ラム４の切り欠き部１４ａは、図
５の第２実施形態例に示されるように、ラム４の外周上
部に直接形成してもよい。The notch 14a of the ram 4 may be formed directly on the upper part of the outer periphery of the ram 4, as shown in the second embodiment of FIG.
【００１５】[0015]
【発明の効果】以上説明したように、本発明の油圧ドロ
ップハンマの打撃力調整方法及び装置は、ケーシング内
に１個設けたセンサにより、ラムに形成した一定長さの
切り欠き部の落下時間を計測し、落下時間からラムの落
下速度を算出し、落下速度と設定落下速度とを比較演算
して、ラムの落下速度を設定落下速度とするために、ラ
ムの上昇ストロークを制御するので、簡単な構造で、ラ
ムの打撃力を自動補正して、適正な打撃力によって杭を
地中に打ち込むことができる。As described above, according to the method and the apparatus for adjusting the impact force of the hydraulic drop hammer of the present invention, the falling time of the notch of a fixed length formed on the ram is determined by the sensor provided in the casing. Is calculated from the falling time, the ram's falling speed is calculated from the falling time, the falling speed is compared with the set falling speed, and the ram's rising stroke is controlled to make the ram's falling speed the set falling speed. With a simple structure, the striking force of the ram is automatically corrected, and the pile can be driven into the ground with an appropriate striking force.
【図１】 本発明の第１実施形態例を示す油圧ドロップ
ハンマ打撃力調整装置の概略図である。FIG. 1 is a schematic diagram of a hydraulic drop hammer striking force adjusting device showing a first embodiment of the present invention.
【図２】 同じく制御部の作動を示すフローチャート図
である。FIG. 2 is a flowchart showing the operation of the control unit.
【図３】 近接スイッチと切り欠き部の関係を示す側面
図である。FIG. 3 is a side view showing a relationship between a proximity switch and a notch.
【図４】 近接スイッチと切り欠き部の関係を示す平面
図である。FIG. 4 is a plan view showing a relationship between a proximity switch and a notch.
【図５】 第２実施形態例の近接スイッチと切り欠き部
の関係を示す側面図である。FIG. 5 is a side view showing a relationship between a proximity switch and a cutout portion according to the second embodiment.
１…油圧ドロップハンマ、２…ケーシング、３…油圧シ
リンダ、４…ラム、６…切換弁、９…打撃力調整装置、
１０…制御部、１２…近接スイッチ、１４ａ…切り欠き
部DESCRIPTION OF SYMBOLS 1 ... Hydraulic drop hammer, 2 ... Casing, 3 ... Hydraulic cylinder, 4 ... Ram, 6 ... Switching valve, 9 ... Impact force adjustment device,
10: control unit, 12: proximity switch, 14a: notch
Claims (2)
リンダで上昇、落下させ、前記ケーシング内に設けたセ
ンサによりラムの移動を計測して、ラムの上昇ストロー
クを制御することによりラムの打撃力を調整する油圧ド
ロップハンマの打撃力調整方法において、前記ケーシン
グ内に１個設けたセンサにより、前記ラムに形成した一
定長さの切り欠き部の落下時間を計測し、該落下時間か
ら前記ラムの落下速度を算出し、該落下速度と設定落下
速度とを比較演算して、前記ラムの落下速度を設定落下
速度とするために、前記ラムの上昇ストロークを制御す
ることを特徴とする油圧ドロップハンマの打撃力調整方
法。1. A ram provided in a casing is raised and dropped by a hydraulic cylinder, and the movement of the ram is measured by a sensor provided in the casing to control a rising stroke of the ram. In the method for adjusting the impact force of a hydraulic drop hammer for adjusting a force, a sensor provided in the casing measures a falling time of a notch having a fixed length formed in the ram, and calculates the ram from the falling time. Calculating the falling speed of the ram and comparing the falling speed with the set falling speed to control the rising stroke of the ram so that the falling speed of the ram becomes the set falling speed. How to adjust the hammer impact force.
リンダで上昇、落下させ、前記ケーシング内に設けたセ
ンサによりラムの移動を計測して、ラムの上昇ストロー
クを制御することによりラムの打撃力を調整する油圧ド
ロップハンマの打撃力調整装置において、前記ケーシン
グ内に前記センサを１個設け、前記ラムに、前記センサ
が計測する一定長さの切り欠き部を形成し、前記センサ
が計測する切り欠き部の落下時間から前記ラムの落下速
度を算出し、該落下速度と設定落下速度とを比較演算し
て、前記ラムの落下速度を設定落下速度とするために、
前記ラムの上昇ストロークを制御する制御部を設けたこ
とを特徴とする油圧ドロップハンマの打撃力調整装置。2. A ram provided in a casing is lifted and dropped by a hydraulic cylinder, and a movement of the ram is measured by a sensor provided in the casing to control a rising stroke of the ram. In the hitting force adjusting device for a hydraulic drop hammer for adjusting a force, one sensor is provided in the casing, and a cutout portion having a fixed length measured by the sensor is formed in the ram, and the sensor measures. The falling speed of the ram is calculated from the falling time of the notch, the falling speed is compared with the set falling speed, and the falling speed of the ram is set to the set falling speed.
A hitting force adjusting device for a hydraulic drop hammer, further comprising a control unit for controlling a rising stroke of the ram.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12343698A JPH11315538A (en) | 1998-05-06 | 1998-05-06 | Method and device for adjusting percussion force of hydraulic drop hammer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12343698A JPH11315538A (en) | 1998-05-06 | 1998-05-06 | Method and device for adjusting percussion force of hydraulic drop hammer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11315538A true JPH11315538A (en) | 1999-11-16 |
Family
ID=14860543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12343698A Pending JPH11315538A (en) | 1998-05-06 | 1998-05-06 | Method and device for adjusting percussion force of hydraulic drop hammer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11315538A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102032787B1 (en) * | 2019-01-25 | 2019-10-17 | 주식회사 에이스지오 | Penetration test device for geotechnical site investigation |
| KR20200049291A (en) * | 2018-10-31 | 2020-05-08 | 경북대학교 산학협력단 | Penetrometer for measuring in-situ dynamic stiffness |
| KR102321080B1 (en) * | 2020-04-28 | 2021-11-04 | 경북대학교 산학협력단 | In situ ground property detection system |
-
1998
- 1998-05-06 JP JP12343698A patent/JPH11315538A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200049291A (en) * | 2018-10-31 | 2020-05-08 | 경북대학교 산학협력단 | Penetrometer for measuring in-situ dynamic stiffness |
| KR102032787B1 (en) * | 2019-01-25 | 2019-10-17 | 주식회사 에이스지오 | Penetration test device for geotechnical site investigation |
| KR102321080B1 (en) * | 2020-04-28 | 2021-11-04 | 경북대학교 산학협력단 | In situ ground property detection system |
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