JPS63103118A - Mandrel penetrator for board drain construction work - Google Patents
Mandrel penetrator for board drain construction workInfo
- Publication number
- JPS63103118A JPS63103118A JP24552986A JP24552986A JPS63103118A JP S63103118 A JPS63103118 A JP S63103118A JP 24552986 A JP24552986 A JP 24552986A JP 24552986 A JP24552986 A JP 24552986A JP S63103118 A JPS63103118 A JP S63103118A
- Authority
- JP
- Japan
- Prior art keywords
- mandrel
- press
- stand
- fitting
- chuck
- 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.)
- Granted
Links
- 238000010276 construction Methods 0.000 title claims description 21
- 230000000149 penetrating effect Effects 0.000 abstract 2
- 230000035515 penetration Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003673 groundwater Substances 0.000 description 2
- 241000282537 Mandrillus sphinx Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、水分を含む湿地や干拓地等の軟弱地盤を改良
するため、水分吸上げ用ボードドレンを地中に埋設する
ボードドレン施工機において、ボードドレンを収容する
マンドレルを地中に圧入する装置に関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention is a board drain construction machine that buries a moisture absorption board drain underground in order to improve soft ground such as wetlands and reclaimed land that contain moisture. The present invention relates to a device for press-fitting a mandrel containing a board drain into the ground.
（従来の技術）
軟弱地盤を改良するため、地盤にボードドレン（従来は
紙を材料とし、ペーパードレンと称されていたが、近年
はプラスチックス製を主流とし、プラスチックドレンと
称されることもある。）と称される毛細管現象による水
分吸上げ部材を、マンドレルと称されるパイプに抜は止
めして収容した状態でボードドレンの上端が地上に露出
するように施工機によって埋設し、これを長期間放置し
ておくことにより、前記ボードドレンを介して吸上げら
れる地下水を地上において蒸発させ、これによって地盤
改良を行なうことが行なわれている。(Conventional technology) In order to improve soft ground, board drains (used to be made of paper and called paper drains, but in recent years plastic drains have become mainstream and are sometimes called plastic drains) A material that absorbs moisture by capillary action (known as a "mandrel") is housed in a pipe called a mandrel, and is buried with a construction machine so that the upper end of the board drain is exposed above the ground. By leaving the groundwater for a long period of time, the groundwater sucked up through the board drain evaporates above the ground, thereby improving the ground.
こ１のようなボードドレンを用いる軟弱地盤改良用施工
機において、前記マンドレルを圧入する従米の装置には
、バイブロハンマの振動力をマンドレルの頂部から加え
るものと、ウィンチにより巻取られるワイヤロープをマ
ンドレルの上部を把持する装置に接続して圧入するもの
とがある。In the construction machine for improving soft ground using a board drain like this 1, the conventional device for press-fitting the mandrel includes one that applies the vibrating force of a vibrohammer from the top of the mandrel, and one that applies the vibrating force of a vibrohammer from the top of the mandrel, and a device that applies the vibrating force of a vibratory hammer to the top of the mandrel. Some devices are connected to a device that grips the top of the device and are press-fitted.
しかし、これらの圧入装置は、マンドレルの頂部あるい
は上部から押込み力を加えるものであるため、マンドレ
ルが長くなると、曲りや座屈変形、破損をまねくという
問題点がある。However, since these press-fitting devices apply a pushing force from the top or upper part of the mandrel, there is a problem that if the mandrel becomes long, it may bend, buckle, or break.
また、従来の圧入装置は、一台の施工機により１本ずつ
圧入しているため、広大な埋立地等にボードドレンを埋
設する場合には、長時間を要するという問題点がある。Further, in the conventional press-fitting device, one construction machine press-fits one board at a time, so there is a problem that it takes a long time to bury the board drain in a vast landfill or the like.
（発明が解決しようとする問題点）
本発明は、上記の問題点に鑑みてなされたもので、マン
・ドレルを座屈あるいは変形させることなく圧入でき、
かつボードドレンを能率良く埋設でき、さらに施工条件
に応じて適正な施工が可能となるマンドレル圧入装置を
提供することを目的とする。(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned problems, and allows the mandrel to be press-fitted without buckling or deforming.
Another object of the present invention is to provide a mandrel press-fitting device that can efficiently bury a board drain and can perform appropriate construction depending on the construction conditions.
（問題点を解決するための手段）
この目的を達成するため、本発明は、マンドレル圧入用
油圧シリンダの一端をリーダ下部に連結し、該油圧シリ
ンダの他端を、リーダに取付けたガイドレールに沿って
昇降させるマンドレル圧入スタンドの中央部に連結し、
該圧入スタンドに、左右のマンドレル挟持用チャックバ
ンドとこれを開閉させる油圧シリンダからなる複数組の
チャック装置を、相互の間隔を調整可能に設けたことを
特徴とするものであり、地面に近い低い位置にてマンド
レルをチャック装置で挟持し、圧入するので、座屈、変
形がなく、また、一度に複数本のマンドレルが圧入でき
るので、能率的である。さらに、チャック装置の相互の
間隔を調整しうるように取付けたので、チャック装置の
間隔が調整でき、深度、地盤状態等に適合した施工ピッ
チで施工することが可能となる。(Means for solving the problem) In order to achieve this object, the present invention connects one end of a hydraulic cylinder for mandrel press-fitting to the lower part of a leader, and connects the other end of the hydraulic cylinder to a guide rail attached to the leader. Connected to the center of the mandrel press-fit stand that moves up and down along the
The press-fitting stand is equipped with multiple sets of chuck devices consisting of chuck bands for holding the left and right mandrels and hydraulic cylinders for opening and closing the chuck bands, the mutual spacing of which can be adjusted. Since the mandrels are held in place by a chuck device and press-fitted, there is no buckling or deformation, and it is efficient because a plurality of mandrels can be press-fitted at once. Furthermore, since the chuck devices are installed so that the mutual spacing between them can be adjusted, the spacing between the chuck devices can be adjusted, making it possible to carry out construction at a construction pitch that suits the depth, ground condition, etc.
（実施例） 以下本発明の一実施例を図面により説明する。(Example) An embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明によるマンドレル圧入装置を備えたボー
ドドレン施工機の一例を示す側面図である。第１図にお
いて％ １は施工機本体であり、下部走行体ｌａ上に旋
回装ｆｉｌｂを介して上部旋回体ＩＣを設置し、上部旋
回体ｌｃ上には、原動機、巻上装置および各種制御装置
が組込まれている。２はリーダであり、該リーダ２は上
部旋回体ＩＣの前部にブラケットとビンを介して回動自
在に立設され、その上部と上部旋回体１ｃの後部との間
に介在させた左右のバックステー３によりほぼ鉛直に支
持される０本実施例のリーダ２は、第２図に示すように
、フランジ結合により長尺に構成される２木の筒体２ａ
と、両者間を結合する横材２Ｃとからなる。なお、本体
ｌは、油圧ショベル等を用い、ブームの先端にリーダ２
を取付ける構造も採用できる。FIG. 1 is a side view showing an example of a board drain construction machine equipped with a mandrel press-fitting device according to the present invention. In Fig. 1, % 1 is the main body of the construction machine, in which the upper rotating body IC is installed on the lower traveling body la via the rotating structure filb, and the prime mover, hoisting device, and various control devices are installed on the upper rotating body lc. is incorporated. Reference numeral 2 denotes a leader, and the leader 2 is rotatably installed at the front part of the upper revolving body IC via a bracket and a bottle. As shown in FIG. 2, the leader 2 of this embodiment, which is supported almost vertically by a backstay 3, has a two-wooden cylindrical body 2a formed into a long length by flange connection.
and a cross member 2C that connects the two. In addition, the main body l is installed using a hydraulic excavator or the like, and the leader 2 is attached to the tip of the boom.
It is also possible to adopt a structure that attaches.
２０は前記リーダ２に沿って設けられたガイドレール、
５はガイドレール２０に沿って摺動するガイドギブ２１
を介して上下動自在に装着された施工具巻上装置であり
、該施工具巻上装置５は。20 is a guide rail provided along the leader 2;
5 is a guide gib 21 that slides along the guide rail 20
The tool hoisting device 5 is a tool hoisting device mounted so as to be vertically movable via the .
前記上部旋回体ｌｃ上に設置されたウィンチ２２に巻か
れ、かつトップシーブ４に掛けられたワイヤロープ３０
により支持されており、該施工具巻上装置５には、ボー
ドドレンを巻いたリール装置６を搭載し、マンドレル７
を垂下状に固設するか、あるいはボルト等により着脱自
在に取付ける０本発明は、マンドレル７を複数本（第２
図に示すように、本実施例においては２本）設けること
が可能に構成されているので、施工具巻上装置５も複数
本のマンドレル７が設けられるように、マンドレル７を
設ける部分を複数個有し、かつ同数のリール装置６を有
する。マンドレル７は中空鋼管であり、ボードドレンを
内部に収容し、ボードドレンの下端を折り曲げてマンド
レル７に係止させる等の手段により抜は止めする。A wire rope 30 is wound around the winch 22 installed on the upper revolving body lc and hung on the top sheave 4.
The tool hoisting device 5 is equipped with a reel device 6 on which a board drain is wound, and a mandrel 7 is mounted on the tool hoisting device 5.
The present invention has a plurality of mandrels 7 (a second
As shown in the figure, in this embodiment, two mandrels 7) can be provided, so that the tool hoisting device 5 also has a plurality of portions where mandrels 7 are provided so that a plurality of mandrels 7 can be provided. The reel devices 6 are individually owned and have the same number of reel devices 6. The mandrel 7 is a hollow steel pipe, and houses the board drain therein, and is prevented from being pulled out by means such as bending the lower end of the board drain and locking it to the mandrel 7.
次にマンドレル圧入装置２３について説明する。第１図
に示すように、該圧入装置２３は、リーダ２の下部に設
けられるもので、第２図および第３図に示すように、断
面形状がコ字形をなす圧入スタンド８を有し、該圧入ス
タンド８の裏面の左右に前記ガイドレール２０に沿って
摺動するガイドギブ９を取付け、圧入スタンド８の上部
に設けたブラケット２４とリーダ２に固設したブラケッ
ト２５との間に、マンドレル圧入用の油圧シリンダ１８
を、その両端をビン１９ａ、１９ｂによって連結するこ
とにより取付けである。Next, the mandrel press-fitting device 23 will be explained. As shown in FIG. 1, the press-fitting device 23 is provided at the lower part of the leader 2, and as shown in FIGS. 2 and 3, it has a press-fitting stand 8 having a U-shaped cross section. A guide gib 9 that slides along the guide rail 20 is attached to the left and right sides of the back surface of the press-fit stand 8, and a mandrel press-fit is installed between the bracket 24 provided on the upper part of the press-fit stand 8 and the bracket 25 fixed to the leader 2. Hydraulic cylinder 18 for
It is installed by connecting both ends of the two with pins 19a and 19b.
圧入スタンド８には、下記の機構により、２つのチャッ
ク装置１０Ａ、ＩＯＢが間隔調整自在に取付けである。Two chuck devices 10A and IOB are attached to the press-fitting stand 8 by the following mechanism so that the interval can be adjusted freely.
圧入スタンド８内には１間隔を置いて対をなす２組の縦
板２６．２７を固設し、各縦板２６．２７間に架設した
２木の反力取りビン１５．１５およびねじロッド１６を
、チャック装置１０Ａ、ＩＯＥの取付は用ブラケット１
２に設けた穴２８．２８．２９に摺動自在に貫挿すると
共に、取付は用ブラケット１２を挟むように、前記ねじ
ロッド１６にねじ１７ａ、１７ｂを螺合し、ねじ１７ａ
、１７ｂのいずれかを緩めて取付は用ブラケット１２を
水平に移動してねじ１７ａ、１７ｂを締ることにより、
取付は用ブラケッ）１２が任意位−に位置決めされるよ
うになっている。Inside the press-fit stand 8, two sets of vertical plates 26, 27 are fixedly set at one interval, and two wooden reaction force absorbing bins 15, 15 and threaded rods are installed between each vertical plate 26, 27. 16, chuck device 10A, and bracket 1 for mounting the IOE.
The screws 17a and 17b are inserted into the threaded rod 16 so as to be slidably inserted into the holes 28, 28, and 29 provided in the screw rod 16, and the screws 17a and 17b are screwed into the threaded rod 16 so as to sandwich the bracket 12 between the screws 17a and 17b.
, 17b, move the bracket 12 horizontally, and tighten the screws 17a, 17b.
The mounting bracket 12 can be positioned at any desired position.
取付は用ブラケッ）１２には、マンドレル７を挟持する
チャックバンド３３ａ、３３ｂが、同軸ビン１１を中心
として、バンド先端間にビン１３ａ、１３ｂにより取付
けられた油圧シリンダ１４により開閉されるように取付
けである。The chuck bands 33a and 33b that sandwich the mandrel 7 are mounted on the bracket 12 so that the chuck bands 33a and 33b that sandwich the mandrel 7 are opened and closed by a hydraulic cylinder 14 that is attached between the ends of the bands by the bins 13a and 13b, centering on the coaxial bin 11. It is.
また、圧入スタンド８の両端には、前記チャック装置１
０Ａ、ＩＯＨのような位置調整可能なチャック装置（図
示せず）を有する予備の圧入スタンド８Ａがポルト３４
およびナツト３５により着脱自在に結合される結合部３
６を有する。Further, the chuck device 1 is provided at both ends of the press-fit stand 8.
A spare press-fit stand 8A with a position-adjustable chuck device (not shown) such as 0A, IOH is attached to the port 34.
and a coupling part 3 which is detachably coupled with a nut 35.
It has 6.
この圧入装置２３を用いてマンドレル７の圧入を行なう
場合には、チャック装置１０Ａ、ＩＯＨの油圧シリンダ
１４を収縮させてマンドレル７をチャックバンド３３ａ
、３３ｂにより挟持し、油圧シリンダ１８を伸長させる
。ここで２チャック装２ｆｆｉｌＯＡ、１０Ｂは、取付
は用ブラケット１２が２木の反力取りビン１５を介して
圧入スタンド８に取付けられているので、マンドレル７
に、本体１の重みを反力とした、圧入スタンド８および
チャック装置１１０Ａ、ＬＯＢを介する圧入力が加わる
。続いて油圧シリンダ１４を伸長させてマンドレル７を
チャックバンド３３ａ、３３ｂから離し、油圧シリンダ
１８を収縮させて圧入スタンド８を引上げ、再び油圧シ
リンダ１４を収縮させてチャックバンド３３ａ、３３ｂ
によりマンドレル７を挟持し、油圧シリンダ１８を伸長
させてマンドレル７を圧入するという動作を繰返すこと
により、マンドレル７中体を地中に圧入する。その後、
マンドレル７をチャック装置１０Ａ、ＩＯＢから解放し
、ウィンチ２２により施工具巻取装置５をマンドレル７
と共に引上げると、マンドレル７中のボードドレンのみ
が地中に残り、マンドレル７を地上で切断することによ
り、モの個所におけるボードドレンの施工が完了し、別
の場所で同様な作業を繰返す。When press-fitting the mandrel 7 using this press-fitting device 23, the chuck device 10A and the hydraulic cylinder 14 of the IOH are contracted to move the mandrel 7 to the chuck band 33a.
, 33b to extend the hydraulic cylinder 18. Here, the two chuck devices 2ffilOA and 10B are mounted on the press-fit stand 8 through the two wooden reaction force absorbing bins 15, so the mandrel 7
A pressing force is applied via the press-fitting stand 8, the chuck device 110A, and the LOB, using the weight of the main body 1 as a reaction force. Next, the hydraulic cylinder 14 is extended to release the mandrel 7 from the chuck bands 33a, 33b, the hydraulic cylinder 18 is contracted to pull up the press-fit stand 8, and the hydraulic cylinder 14 is contracted again to release the chuck bands 33a, 33b.
By repeating the operation of holding the mandrel 7 between the two, extending the hydraulic cylinder 18, and press-fitting the mandrel 7, the middle body of the mandrel 7 is press-fitted into the ground. after that,
The mandrel 7 is released from the chuck device 10A and the IOB, and the tool winding device 5 is released from the mandrel 7 by the winch 22.
When pulled up together, only the board drain in the mandrel 7 remains underground, and by cutting the mandrel 7 on the ground, the construction of the board drain at the location is completed, and the same work is repeated at another location.
本発明の装置は１例えば実施例に示したようなねじ１７
ａ、１７ｂの締緩とブラケッ）１２の移動により、チャ
ック装置１０Ａ、ＩＯＥの位置調整すなわち相互の間隔
調整を可能としているから、マンドレル７．７間の間隔
を、深度や地盤状態に合わせて調整して施工することが
できる。The device according to the invention includes a screw 17, for example as shown in the embodiment.
It is possible to adjust the position of the chuck device 10A and IOE, that is, adjust the mutual spacing, by tightening and loosening screws a and 17b and moving bracket 12. Therefore, the spacing between mandrels 7 and 7 can be adjusted according to the depth and ground condition. It can be constructed by
また、本実施例においては、前記圧入スタンド８の両端
に予備の圧入スタンド８Ａを連結可能な結合部３６を設
けたので、マンドレル７の本数をさらに増加させること
も可能である。予備の圧入スタンド８Ａを結合する場合
には、施工具巻上装ｒ１１５にもマンドリル７と同数の
リール装置６を設置する。また、１つの圧入スタンド８
に取付けるチャック装置１０Ａ、ＩＯＢの数は１種々に
変更可能である。Furthermore, in this embodiment, since the connecting portions 36 to which the spare press-fit stand 8A can be connected are provided at both ends of the press-fit stand 8, it is also possible to further increase the number of mandrels 7. When connecting the spare press-fitting stand 8A, the same number of reel devices 6 as the mandrills 7 are installed on the tool hoist r115 as well. Also, one press-fit stand 8
The number of chuck devices 10A and IOBs to be attached to can be changed in various ways.
（発明の効果）
以上述べたように１本発明のマンドレル圧入装置は、リ
ーダの下部に設けた油圧シリンダにより、マンドレルを
挟持するチャック装置を有する圧入スタンドを昇降させ
るように構成したので、地面に近い低い位置にてマンド
レルをチャック装置により挟持し、圧入するから、マン
ドレルの座屈、変形を防止することができる。(Effects of the Invention) As described above, the mandrel press-fitting device of the present invention is configured such that a press-fitting stand having a chuck device for clamping the mandrel is raised and lowered by a hydraulic cylinder provided at the lower part of the leader. Since the mandrel is clamped by the chuck device at a low position and press-fitted, buckling and deformation of the mandrel can be prevented.
また、圧入スタンドに複数組のチャック装置を設【Ｔた
ので、一度に複数本のマンドレルが圧入でき、能率良く
作業を行なうことが可能となる。Furthermore, since a plurality of sets of chuck devices are installed on the press-fitting stand, a plurality of mandrels can be press-fitted at the same time, making it possible to perform the work efficiently.
また、チャック装置の相互の間隔を３Ｊ整しうるように
構成したので、１台の施工機で施工ピッチの変更に対応
できる。また、１つの圧入スタンドに複数のチャック装
置を間隔調整自在に取付けたので、深度、地盤状態、施
工ピッチ等の施工条件に合わせて、単管４２管同時、３
賛同時、４管間時施工に対応できるので、施工機の稼動
率と施工能率の向上が達成できる。また、圧入装置は全
油圧式のため、無騒音、無＠動施工が可能となる。Furthermore, since the chuck devices are configured so that the distance between them can be adjusted by 3J, a single construction machine can handle changes in the construction pitch. In addition, multiple chuck devices are installed on one press-fit stand so that the intervals can be adjusted freely, so 42 single pipes or 3
Since it is possible to perform construction at the same time as four pipes, it is possible to improve the operating rate of construction equipment and construction efficiency. Additionally, since the press-in device is fully hydraulic, noiseless and motion-free construction is possible.
第１図は本発明による圧入装置の一例を装備した施工機
の一例を示す側面図、第２図は第１図のＥ部の水平断面
図、第３図は第２図のＦ−Ｆ断面図、第４図は第３図の
Ｈ−Ｈ断面図である。
特許出願人 東急建設株式会社外１名
代理人 弁理士 秋木正実外１名
第３図Fig. 1 is a side view showing an example of a construction machine equipped with an example of a press-fitting device according to the present invention, Fig. 2 is a horizontal sectional view of section E in Fig. 1, and Fig. 3 is a sectional view taken along line FF in Fig. 2. FIG. 4 is a sectional view taken along the line HH in FIG. 3. Patent applicant: Tokyu Construction Co., Ltd. and one other agent Patent attorney: Masami Akiki and one other person Figure 3
Claims (1)
に連結し、該油圧シリンダの他端を、リーダに取付けた
ガイドレールに沿って昇降させるマンドレル圧入スタン
ドの中央部に連結し、該圧入スタンドに、左右のマンド
レル挟持用チャックバンドとこれを開閉させる油圧シリ
ンダからなる複数組のチャック装置を、各組のチャック
装置の相互の間隔を調整しうるように取付けたことを特
徴とするボードドレン施工機用マンドレル圧入装置。 ２、前記圧入スタンドの両端に予備の圧入スタンドを連
結可能な結合部を設けたことを特徴とする特許請求の範
囲第１項記載のボードドレン施工機用マンドレル圧入装
置。[Claims] 1. One end of a hydraulic cylinder for mandrel press-fitting is connected to the lower part of the leader, and the other end of the hydraulic cylinder is connected to the center part of a mandrel press-fitting stand that is raised and lowered along a guide rail attached to the leader. , a plurality of sets of chuck devices each consisting of left and right mandrel clamping chuck bands and hydraulic cylinders for opening and closing the chuck bands are attached to the press-fitting stand so that the distance between the chuck devices of each set can be adjusted. Mandrel press-fit device for board drain construction machine. 2. The mandrel press-fitting device for a board drain construction machine according to claim 1, characterized in that the press-fitting stand is provided at both ends with connecting portions to which a spare press-fitting stand can be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24552986A JPS63103118A (en) | 1986-10-17 | 1986-10-17 | Mandrel penetrator for board drain construction work |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24552986A JPS63103118A (en) | 1986-10-17 | 1986-10-17 | Mandrel penetrator for board drain construction work |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63103118A true JPS63103118A (en) | 1988-05-07 |
| JPH0536569B2 JPH0536569B2 (en) | 1993-05-31 |
Family
ID=17135043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24552986A Granted JPS63103118A (en) | 1986-10-17 | 1986-10-17 | Mandrel penetrator for board drain construction work |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63103118A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101897788B1 (en) * | 2018-01-23 | 2018-09-12 | (주)미래지반연구소 | Apparatus for moving a see leader and PBD execution method for operating he same |
| WO2018203587A1 (en) * | 2017-05-02 | 2018-11-08 | (주)미래지반연구소 | Moving apparatus for leader |
-
1986
- 1986-10-17 JP JP24552986A patent/JPS63103118A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018203587A1 (en) * | 2017-05-02 | 2018-11-08 | (주)미래지반연구소 | Moving apparatus for leader |
| KR101897788B1 (en) * | 2018-01-23 | 2018-09-12 | (주)미래지반연구소 | Apparatus for moving a see leader and PBD execution method for operating he same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0536569B2 (en) | 1993-05-31 |
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