JP5275936B2 - Drilling device and cutting device support - Google Patents

Drilling device and cutting device support Download PDF

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JP5275936B2
JP5275936B2 JP2009167324A JP2009167324A JP5275936B2 JP 5275936 B2 JP5275936 B2 JP 5275936B2 JP 2009167324 A JP2009167324 A JP 2009167324A JP 2009167324 A JP2009167324 A JP 2009167324A JP 5275936 B2 JP5275936 B2 JP 5275936B2
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cutting device
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JP2011021382A (en
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和之 原
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株式会社富士邑
大日建機株式会社
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Description

本発明は、例えば下水道に連通する人孔（マンホール）において、その内壁に配設される昇降用の足掛金具を撤去する際に使用される穿孔装置及び切削装置支持体に関する。 The present invention relates to a drilling device and a cutting device support that are used when, for example, a lifting hole bracket disposed on an inner wall of a manhole communicating with a sewer is removed.

人孔は、作業者が下水道等を点検するときなどの出入口として利用されるが、その内壁には、作業者が人孔内を昇降するために、鉄製のコの字形の足掛金具（ステップ等）が配設されている。この足掛金具は、経年変化により劣化するので、設置から数十年経過した場合には、表面に腐食防止用の樹脂がコーティングされた新しい鉄製の足掛金物に取り換える必要があった。
従来、この足掛金物を取替える場合、作業者自身が直接人孔に入り、足掛金具近くの内壁を電動ハンマー等を使用して破壊することで、人孔の内壁から足掛金具を取り外すことが行われていた。 The manhole is used as an entrance when an operator inspects the sewer, etc., and the inner wall has an iron U-shaped foot bracket (step) for the operator to move up and down the manhole. Etc.) are arranged. Since this foot bracket is deteriorated due to aging, it has been necessary to replace it with a new iron foot bracket whose surface is coated with a resin for preventing corrosion when decades have passed since installation.
Conventionally, when replacing this foot bracket, the worker himself enters the manhole directly, and the inner wall near the foot bracket is destroyed using an electric hammer or the like to remove the foot bracket from the inner wall of the manhole. Was done.

しかしながら、電動ハンマー等を使用した作業員の手作業により足掛金具を交換する場合、足掛金具の撤去のために必要以上に穴を大きく開けたり、また、そのための騒音も大きくなるとともに、煩雑であり作業時間もかかるという問題点が存在した。
そこで、特許文献１に記載されるように、作業者が人孔に入らないで、その内壁に配設された足掛金物を自動的に取り換えることができる足掛金物自動取替え装置が提案されているが、装置が複雑且つ高価であるという課題がある。
また、人孔に装着される足掛金具４は、図３に示すように、中央から左右にずれた位置に固定される場合が多く、足掛金具４の装着方向に沿って孔を設けることが必ずしも容易でなかった。 However, when exchanging foot brackets manually by an operator using an electric hammer or the like, a hole is made larger than necessary to remove the foot bracket, and noise for that is also increased, which is complicated. However, there is a problem that it takes time to work.
Therefore, as described in Patent Document 1, there is proposed an automatic foot bracket replacement device that can automatically replace a foot bracket disposed on an inner wall of an operator without entering a manhole. However, there is a problem that the apparatus is complicated and expensive.
Further, as shown in FIG. 3, the foot bracket 4 attached to the human hole is often fixed at a position shifted from the center to the left and right, and the hole is provided along the mounting direction of the foot bracket 4. However, it was not always easy.

特開平８−３５２３３号公報JP-A-8-35233

本発明は上記事情に鑑みて提案されたものであり、簡易な構造で人孔の壁部に穴を穿孔可能とする穿孔装置、及び、穿孔装置における切削装置を支持する切削装置支持体を提供することを目的とする。 The present invention has been proposed in view of the above circumstances, and provides a drilling device capable of drilling a hole in a human hole wall with a simple structure , and a cutting device support for supporting the cutting device in the drilling device. The purpose is to do.

上記目的を達成するため本発明は、人孔の内壁間に架設して内壁を穿孔する穿孔装置であって、次の構成を含むことを特徴としている。
前記人孔の一方の内壁に対して係止可能な係止部を一端側に配した筒状部。
前記筒状部内を移動することで筒状部外に延出可能とし所望位置で前記筒状部に対して固定される伸長部。
前記伸長部の先端側に装着し他方の内壁に先端部が当接するよう長さが調整可能な支点部。
前記筒状部に対して平行に位置するよう固定された棒状部。
前記棒状部に対してその長手方向に移動可能に装着された円柱状切削刃を有する切削装置。
また、前記係止部は、平面部と、該平面部に対して任意の長さに突出可能な４本の水平固定ボルトを備えることで、前記筒状部が内壁の円弧状面に対して前記人孔の直径からずれた位置で係止可能としている。 In order to achieve the above object, the present invention is a perforating apparatus that is constructed between inner walls of a human hole and perforates the inner wall, and includes the following configuration.
The cylindrical part which has arranged the latching | locking part which can be latched with respect to one inner wall of the said human hole on the one end side.
An elongating portion that can extend outside the tubular portion by moving in the tubular portion and is fixed to the tubular portion at a desired position.
A fulcrum portion that is attached to the distal end side of the extension portion and whose length can be adjusted so that the distal end portion comes into contact with the other inner wall.
A rod-like portion fixed so as to be parallel to the cylindrical portion.
A cutting device having a cylindrical cutting blade mounted on the rod-like portion so as to be movable in the longitudinal direction.
Moreover, the said latching | locking part is equipped with a horizontal part and four horizontal fixing bolts which can project to arbitrary length with respect to this flat part, The said cylindrical part is with respect to the circular arc-shaped surface of an inner wall. It can be locked at a position deviated from the diameter of the human hole.

請求項２は、人孔の内壁間に架設される切削装置支持体であって、次の構成を含むことを特徴としている。
前記人孔の一方の内壁に対して係止可能な係止部を一端側に配した筒状部。
前記筒状部内を移動することで筒状部外に延出可能とし所望位置で前記筒状部に対して固定される伸長部。
前記伸長部の先端側に装着し他方の内壁に先端部が当接するよう長さが調整可能な支点部。
前記筒状部に対して平行に位置するよう固定され、円柱状切削刃を有する切削装置を装着可能とする棒状部。
前記係止部は、平面部と、該平面部に対して任意の長さに突出可能な４本の水平固定ボルトを備えることで、前記筒状部が内壁の円弧状面に対して前記人孔の直径からずれた位置で係止可能としている。 A second aspect of the present invention is a cutting device support that is installed between the inner walls of the human hole, and includes the following configuration.
The cylindrical part which has arranged the latching | locking part which can be latched with respect to one inner wall of the said human hole on the one end side.
An elongating portion that can extend outside the tubular portion by moving in the tubular portion and is fixed to the tubular portion at a desired position.
A fulcrum portion that is attached to the distal end side of the extension portion and whose length can be adjusted so that the distal end portion comes into contact with the other inner wall.
A rod-shaped portion that is fixed so as to be positioned in parallel to the tubular portion and that can be mounted with a cutting device having a cylindrical cutting blade.
The locking portion includes a flat portion and four horizontal fixing bolts that can protrude to an arbitrary length with respect to the flat portion, so that the cylindrical portion is in contact with the arcuate surface of the inner wall. It can be locked at a position deviated from the diameter of the hole.

請求項３は、請求項２の切削装置支持体において、前記係止部は、先細となる支点部を備えることで、内壁の円弧状面に対して係止可能としたことを特徴としている。 According to a third aspect of the present invention, in the cutting device support of the second aspect, the locking portion includes a fulcrum portion that is tapered, so that the locking portion can be locked to the arcuate surface of the inner wall.

本発明の穿孔装置によれば、人孔の内壁間に架設した支持体に切削装置を装着して、内壁に埋没した足掛金具の根元周囲に穴を穿孔することで、内壁の破壊を最小限にして足掛金具の根元を撤去することができる。そのため、内壁破壊によって生じる騒音の発生も抑制することができる。   According to the drilling device of the present invention, the cutting device is mounted on a support member built between the inner walls of the human hole, and the hole is drilled around the base of the footrest buried in the inner wall, thereby minimizing the destruction of the inner wall. The base of the foot bracket can be removed as much as possible. Therefore, it is possible to suppress the generation of noise caused by inner wall destruction.

本発明の実施形態の一例としての穿孔装置を示す正面説明図である。It is front explanatory drawing which shows the perforation apparatus as an example of embodiment of this invention. 穿孔装置から切削装置を取り外した穿孔装置支持体の裏面説明図である。It is back surface explanatory drawing of the punching device support body which removed the cutting device from the punching device. 足掛金具が配設された人孔の縦断面説明図である。It is a longitudinal cross-sectional explanatory drawing of the human hole by which the footrest metal fitting was arrange | positioned. 他の構成の係止部を有する穿孔装置支持体の一部分を示す正面説明図である。It is front explanatory drawing which shows a part of punching device support body which has the latching | locking part of another structure. （ａ）〜（ｃ）は、人孔内足掛金具の撤去・設置方法の工程を説明するための人孔の横断面説明図である。(A)-(c) is a cross-sectional explanatory drawing of a human hole for demonstrating the process of the removal and installation method of a footrest metal fitting in a human hole.

本発明の穿孔装置の実施の形態の一例について、図１〜図３を参照しながら説明する。
本発明の穿孔装置１は、図３に示すような下水道に連通する人孔（マンホール）３において、その内壁に配設される昇降用の足掛金具４を撤去する際に、人孔３の内壁間に架設して内壁を穿孔するように使用されるものである。図３では、人孔３の内壁に配設された足掛金具４において、右側の足掛金具４と左側の足掛金具４との間に間隔を空けて配置しているが、右側と左側を近づけ、上方から見た場合に両者が重なるような配置であってもよい。
穿孔装置１は、切削装置支持体１０に切削装置３０（ドリル装置）を装着して構成されている。切削装置３０は、専用のもの作製して装着してもよいし、また、ドリル装置として市販されている切削装置を使用してもよい。 An example of an embodiment of the punching device of the present invention will be described with reference to FIGS.
When the punching device 1 according to the present invention removes the lifting and lowering foot bracket 4 disposed on the inner wall of a manhole 3 communicating with the sewer as shown in FIG. It is used so as to be pierced between inner walls. In FIG. 3, the foot bracket 4 disposed on the inner wall of the human hole 3 is disposed with a space between the right foot bracket 4 and the left foot bracket 4. May be arranged so that they overlap each other when viewed from above.
The drilling device 1 is configured by mounting a cutting device 30 (drill device) on a cutting device support 10. The cutting device 30 may be manufactured and mounted as a dedicated one, or a cutting device commercially available as a drill device may be used.

切削装置支持体１０は、方形筒状で形成された長尺状の筒状部１１と、筒状部１１内を移動して筒状部外に延出可能とし所望位置で固定される伸長部１２とを備えて構成されている。伸長部１２には、側面間を貫通する位置に長尺方向に沿って複数の穴１３が設けられている。そして、この穴１３の内の一つを筒状部１１の対向する面に設けられた穴１４に合わせてピン１５を貫通させ、反対側に突出したピン１５の先端側にストッパー１６を装着させることで、筒状部１１に対して伸長部１２を所望位置で固定するようになっている。 The cutting device support 10 includes a long cylindrical portion 11 formed in a rectangular cylindrical shape, and an elongated portion that can move inside the cylindrical portion 11 and extend outside the cylindrical portion and is fixed at a desired position. 12. The elongated portion 12 is provided with a plurality of holes 13 along the longitudinal direction at positions penetrating between the side surfaces. Then, one of the holes 13 is aligned with the hole 14 provided on the opposing surface of the cylindrical portion 11 so that the pin 15 passes therethrough, and the stopper 16 is mounted on the tip side of the pin 15 protruding to the opposite side. Thus, the elongated portion 12 is fixed to the cylindrical portion 11 at a desired position.

伸長部１２が延出するのと反対側の筒状部１１端部には、人孔の内壁の円弧状面に対して係止可能な係止部１７が装着されている。係止部１７は、方形状に構成され、その周囲位置の四か所にそれぞれネジ山を有する水平固定ボルト１８が螺着して貫通可能な貫通孔を構成するベース部１９が溶接されている。ベース部１９の貫通孔にはネジ溝が設けられ、４本の水平固定ボルト１８の先端側の突出長さを調整して螺着することで、人孔３の内壁の円弧面に対して係止部１７が任意の位置で係止できるようにし、切削装置支持体１０が水平面内に維持できるように構成されている。
また、人孔の内壁が平面である場合には、係止部１７の前面から各水平固定ボルト１８が突出しないように調整して、係止部１７の前面が内壁面に当接するようにすればよい。 A locking portion 17 that can be locked to the arc-shaped surface of the inner wall of the human hole is attached to the end of the cylindrical portion 11 opposite to the extension portion 12 extending. The locking portion 17 is formed in a square shape, and a base portion 19 that constitutes a through-hole through which a horizontal fixing bolt 18 having a screw thread is screwed at each of four peripheral positions is welded. . A threaded groove is provided in the through hole of the base portion 19, and the projecting length on the tip side of the four horizontal fixing bolts 18 is adjusted and screwed to engage with the arc surface of the inner wall of the human hole 3. The stopper 17 can be locked at an arbitrary position, and the cutting device support 10 can be maintained in a horizontal plane.
Further, when the inner wall of the human hole is a flat surface, the horizontal fixing bolts 18 are adjusted so as not to protrude from the front surface of the locking portion 17 so that the front surface of the locking portion 17 contacts the inner wall surface. That's fine.

伸長部１２の先端側には方形支持体２１が固定され、この方形支持体２１に設けた孔２２に支点部２３が螺着されて長さが調整可能になっている。支点部２３には先細の先端部２４が形成され、人孔の内壁に対して点接触で当接するよう構成されている。   A rectangular support 21 is fixed to the distal end side of the elongated portion 12, and a fulcrum 23 is screwed into a hole 22 provided in the rectangular support 21, so that the length can be adjusted. The fulcrum part 23 is formed with a tapered tip part 24 and is configured to contact the inner wall of the human hole by point contact.

筒状部１１の側面側には、筒状部１１に対して平行に位置するよう平板上のプレート２５を介して棒状部２６が固定されている。棒状部２６には、円柱状切削刃３１を有する切削装置３０が、棒状部２６の長手方向に移動可能なように装着されている。切削装置３０は、アーム３２の回転動作により棒状部２６への押圧が調整されて棒状部２６の任意の位置で固定できるようになっている。
円柱状切削刃３１は、外部の発電機等からの電源供給を受け、切削装置３０の内部に搭載されたモータ（図示せず）により回転駆動するとともに、給水管３２を介して円柱状切削刃３１の上端に水が供給され、円柱状切削刃３１の内面側を伝わった水の供給を受けながら先端部分が回転することで、人孔の壁面を切削して円柱状孔が形成できるように構成されている。 On the side surface side of the cylindrical portion 11, a rod-shaped portion 26 is fixed via a plate 25 on a flat plate so as to be positioned in parallel with the cylindrical portion 11. A cutting device 30 having a cylindrical cutting blade 31 is attached to the rod-shaped portion 26 so as to be movable in the longitudinal direction of the rod-shaped portion 26. The cutting device 30 can be fixed at an arbitrary position of the rod-shaped portion 26 by adjusting the pressing to the rod-shaped portion 26 by the rotation operation of the arm 32.
The cylindrical cutting blade 31 is supplied with power from an external generator or the like, is rotationally driven by a motor (not shown) mounted in the cutting device 30, and is provided with a cylindrical cutting blade via a water supply pipe 32. Water is supplied to the upper end of 31 and the tip part rotates while receiving the supply of water transmitted through the inner surface side of the cylindrical cutting blade 31 so that the cylindrical hole can be formed by cutting the wall surface of the human hole. It is configured.

上記例では、複数の水平固定ボルト１８を備えた係止部としたが、内壁に係止可能な構造であればよい。例えば、図４に示すように、筒状部１１に対して平行に位置するよう連結部２７を介して棒状部２６を固定し、筒状部１１の端部に先端突起を有する支持部２８を固定することで係止部１７としてもよい。図４中、図１と同じ構成を取る部分については同一符号を付している。
この場合、図１の例の切削装置支持体１０の係止部１７のように各水平固定ボルト１８の長さ調整を行う必要がないが、人孔の内壁間の水平面位置に切削装置支持体１０を位置させるように配置する必要がある。 In the above example, the locking portion including the plurality of horizontal fixing bolts 18 is used, but any structure that can be locked to the inner wall may be used. For example, as shown in FIG. 4, a rod-like portion 26 is fixed via a connecting portion 27 so as to be parallel to the tubular portion 11, and a support portion 28 having a tip protrusion at the end of the tubular portion 11 is provided. It is good also as the latching | locking part 17 by fixing. In FIG. 4, parts having the same configuration as in FIG.
In this case, it is not necessary to adjust the length of each horizontal fixing bolt 18 as in the locking portion 17 of the cutting device support 10 in the example of FIG. 1, but the cutting device support is positioned at a horizontal plane position between the inner walls of the human hole. It is necessary to arrange so that 10 is located.

次に、上述した穿孔装置を利用して人孔の内壁に配設された足掛金具を撤去し、新しい足掛金具を設置する方法について、図５を参照しながら説明する。
先ず、切断工程として、人孔３の内壁から突出する足掛金具４のコ字状部（図５（ａ））について、市販の切断工具（図示せず）を使用して根元４ａを残して切断する（図５（ｄ））。
次に、撤去工程として、人孔３の内壁間に円柱状切削刃３１を有する切削装置３０が装着された切削装置支持体１０を架設する（図５（ｃ））。切削装置支持体１０を架設するに際しては、筒状部１１に対する伸長部１２の長さを調整するとともに、４本の水平固定ボルト１８の先端側の突出長さを調整して人孔３の内壁の円弧状面に対して係止部１７を係止し、支点部２３の突出長を調整することで、根元４ａに平行に円柱状切削刃３１が切削可能な位置に切削装置支持体１０を人孔３の内壁間に根元４ａ（足掛金具４）の装着方向に沿って固定する。 Next, a method for removing a foot bracket provided on the inner wall of the human hole using the above-described punching device and installing a new foot bracket will be described with reference to FIG.
First, as a cutting process, a commercially available cutting tool (not shown) is used to leave the root 4a for the U-shaped portion (FIG. 5A) of the foot bracket 4 protruding from the inner wall of the human hole 3. Cut (FIG. 5D).
Next, as a removing step, the cutting device support 10 on which the cutting device 30 having the cylindrical cutting blade 31 is mounted between the inner walls of the human hole 3 is installed (FIG. 5C). When installing the cutting device support 10, the length of the elongated portion 12 with respect to the tubular portion 11 is adjusted, and the protruding length of the four horizontal fixing bolts 18 on the front end side is adjusted to adjust the inner wall of the human hole 3. The cutting device support 10 is placed at a position where the cylindrical cutting blade 31 can be cut in parallel to the root 4a by locking the locking portion 17 with respect to the arcuate surface and adjusting the protruding length of the fulcrum portion 23. It fixes along the mounting direction of the base 4a (foot bracket 4) between the inner walls of the human hole 3.

この状態で切削装置３０の駆動を行い、円柱状切削刃３１の回転により足掛金具の根元４ａの周囲を切削することで根元４ａを円柱状の周囲壁とともに撤去する（撤去工程）。
そして、全ての根元４ａを撤去した後、根元４ａを撤去することで穿孔された孔に新しい足掛金具を配置し、孔の隙間部分にコンクリートを充填して新しい足掛金具の設置を行う（設置工程）。 The cutting device 30 is driven in this state, and the base 4a is removed together with the cylindrical peripheral wall by cutting the periphery of the base 4a of the foot bracket by rotating the cylindrical cutting blade 31 (removal step).
Then, after removing all the bases 4a, a new foot bracket is placed in the hole that has been drilled by removing the base 4a, and the gap between the holes is filled with concrete to install a new foot bracket ( Installation process).

上述した構造の穿孔装置によれば、４本の水平固定ボルト１８の先端側の突出長さを調整して人孔３の内壁の円弧状面に対して係止部１７を係止する一方、筒状部１１に対する伸長部１２の長さを調整、及び、支点部２３の突出長の調整を行うことで、種々内径の人孔３の内壁間に円柱状切削刃３１を有する切削装置３０を足掛金具４の装着方向に沿って容易に架設することができる。そして、この状態で切削装置３０を駆動すれば、円柱状切削刃３１の回転により足掛金具４の根元４ａの周囲を切削して円柱状孔を形成することができる。 According to the punching device having the above-described structure, the protruding portion on the tip side of the four horizontal fixing bolts 18 is adjusted to lock the locking portion 17 against the arcuate surface of the inner wall of the human hole 3, By adjusting the length of the elongated portion 12 relative to the cylindrical portion 11 and adjusting the protruding length of the fulcrum portion 23, the cutting device 30 having the cylindrical cutting blade 31 between the inner walls of the human hole 3 having various inner diameters is provided. It can be easily installed along the mounting direction of the foot bracket 4. If the cutting device 30 is driven in this state, the periphery of the base 4a of the foot bracket 4 can be cut by the rotation of the cylindrical cutting blade 31 to form a cylindrical hole.

１…穿孔装置、 ３…人孔、 ４…足掛け金具、 １０…切削装置支持体、 １１…筒状部、 １２…伸長部、 １７…係止部、 １８…水平固定ボルト、 ２３…支点部、 ２４…先端部、 ２６…棒状部、 ３０…切削装置、 ３１…円柱状切削刃。 DESCRIPTION OF SYMBOLS 1 ... Punching device, 3 ... Human hole, 4 ... Footrest metal fitting, 10 ... Cutting device support body, 11 ... Cylindrical part, 12 ... Elongation part, 17 ... Locking part, 18 ... Horizontal fixing bolt, 23 ... Supporting point part, 24 ... tip portion, 26 ... rod-like portion, 30 ... cutting device, 31 ... cylindrical cutting blade.

Claims (3)

人孔の内壁間に架設して内壁を穿孔する穿孔装置であって、
前記人孔の一方の内壁に対して係止可能な係止部を一端側に配した筒状部と、
前記筒状部内を移動することで筒状部外に延出可能とし所望位置で前記筒状部に対して固定される伸長部と、
前記伸長部の先端側に装着し他方の内壁に先端部が当接するよう長さが調整可能な支点部と、
前記筒状部に対して平行に位置するよう固定された棒状部と、を備えるとともに、
前記係止部は、平面部と、該平面部に対して任意の長さに突出可能な４本の水平固定ボルトを備えることで、前記筒状部が内壁の円弧状面に対して前記人孔の直径からずれた位置で係止可能とする一方、
前記棒状部に対してその長手方向に移動可能に装着された円柱状切削刃を有する切削装置と、
を具備することを特徴とする穿孔装置。 A piercing device for piercing the inner wall between the inner walls of the human hole,
A cylindrical portion arranged on one end side with a locking portion that can be locked to one inner wall of the human hole,
An extension part that can be extended outside the cylindrical part by moving in the cylindrical part and fixed to the cylindrical part at a desired position;
A fulcrum part which is attached to the distal end side of the extension part and whose length can be adjusted so that the distal end part comes into contact with the other inner wall;
A rod-shaped portion fixed so as to be positioned parallel to the tubular portion , and
The locking portion includes a flat portion and four horizontal fixing bolts that can protrude to an arbitrary length with respect to the flat portion, so that the cylindrical portion is in contact with the arcuate surface of the inner wall. While it can be locked at a position deviated from the diameter of the hole,
A cutting device having a cylindrical cutting blade mounted so as to be movable in the longitudinal direction with respect to the rod-shaped portion;
A perforating apparatus comprising: 人孔の内壁間に架設される支持体であって、
前記人孔の一方の内壁に対して係止可能な係止部を一端側に配した筒状部と、
前記筒状部内を移動することで筒状部外に延出可能とし所望位置で前記筒状部に対して固定される伸長部と、
前記伸長部の先端側に装着し他方の内壁に先端部が当接するよう長さが調整可能な支点部と、
前記筒状部に対して平行に位置するよう固定され、円柱状切削刃を有する切削装置を装着可能とする棒状部と、を備えるとともに、
前記係止部は、平面部と、該平面部に対して任意の長さに突出可能な４本の水平固定ボルトを備えることで、前記筒状部が内壁の円弧状面に対して前記人孔の直径からずれた位置で係止可能としたことを特徴とする切削装置支持体。 A support constructed between the inner walls of the human hole,
A cylindrical portion arranged on one end side with a locking portion that can be locked to one inner wall of the human hole,
An extension part that can be extended outside the cylindrical part by moving in the cylindrical part and fixed to the cylindrical part at a desired position;
A fulcrum part which is attached to the distal end side of the extension part and whose length can be adjusted so that the distal end part comes into contact with the other inner wall;
A rod-shaped portion that is fixed so as to be positioned parallel to the tubular portion and that can be mounted with a cutting device having a cylindrical cutting blade ; and
The locking portion includes a flat portion and four horizontal fixing bolts that can protrude to an arbitrary length with respect to the flat portion, so that the cylindrical portion is in contact with the arcuate surface of the inner wall. A cutting device support that can be locked at a position deviated from the diameter of the hole . 前記係止部は、先細となる支点部を備えることで、内壁の円弧状面に対して係止可能とした請求項２に記載の切削装置支持体。 The cutting device support according to claim 2, wherein the locking portion includes a tapered fulcrum portion so that the locking portion can be locked with respect to the arcuate surface of the inner wall.
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JPS60120813U (en) * 1984-01-24 1985-08-15 三山工業株式会社 drilling machine
JP2559534B2 (en) * 1990-12-17 1996-12-04 日本ヒューム管株式会社 Method for repairing footwork in human hole and punching device used in the method
JP4126660B2 (en) * 2004-06-22 2008-07-30 日本ステップ工業株式会社 Step mounting method and fixture to concrete manhole
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