JP5484758B2 - Pipe cutting device - Google Patents

Pipe cutting device Download PDF

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JP5484758B2
JP5484758B2 JP2009061875A JP2009061875A JP5484758B2 JP 5484758 B2 JP5484758 B2 JP 5484758B2 JP 2009061875 A JP2009061875 A JP 2009061875A JP 2009061875 A JP2009061875 A JP 2009061875A JP 5484758 B2 JP5484758 B2 JP 5484758B2
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cutting
fluid pipe
existing fluid
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pipe
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JP2010214490A (en
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直樹 金田
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Cosmo Koki Co Ltd
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本発明は、分割構造を有するとともに開閉可能な開口部を備え既設流体管を水密に囲繞する筐体内で、既設流体管の所定箇所を切断する管切断装置に関する。   The present invention relates to a tube cutting device for cutting a predetermined portion of an existing fluid pipe in a casing having a split structure and having an opening that can be opened and closed, and watertightly surrounding an existing fluid pipe.

従来の管切断手段は、主に、既設流体管に取付けられる本体部と、切削バイトの取付部と連結してその既設流体管の径方向に進退可能にする歩進ネジ部を有し、かつ本体部に固定に取付けられる切断ユニットと、切断ユニットの回転経路近傍において本体部に固定に取付けられるキッカー部と、から構成され、切断ユニットを既設流体管の周方向に回転し、キッカー部が歩進ネジ部と噛合する受動回転部と当接係合し、受動回転部とともに歩進ネジ部が回転して切削バイトが既設流体管の径方向に進み、既設流体管が切断される。   The conventional pipe cutting means mainly has a main body part attached to the existing fluid pipe, a stepping screw part which is connected to the attachment part of the cutting bite and can advance and retreat in the radial direction of the existing fluid pipe, and The cutting unit is fixedly attached to the main body, and the kicker is fixedly attached to the main body near the rotation path of the cutting unit. The cutting unit is rotated in the circumferential direction of the existing fluid pipe, and the kicker The advancing screw portion is brought into contact with and engaged with the advancing screw portion, the stepping screw portion rotates together with the passive rotating portion, the cutting tool advances in the radial direction of the existing fluid pipe, and the existing fluid pipe is cut.

この種の管切断装置には、歩進ネジ部と既設流体管の外面側との間に位置する防護部材が設けられており、この防護部材により、既設流体管から排出される切り粉が歩進ネジ部に進入することを防止している（例えば、特許文献１参照）。   This type of pipe cutting device is provided with a protective member positioned between the stepping screw portion and the outer surface side of the existing fluid pipe, and this protective member causes the chips discharged from the existing fluid pipe to walk. It is prevented from entering the advance screw part (see, for example, Patent Document 1).

特開２００７−３８３１６号公報（第９頁、第６図）JP 2007-38316 A (page 9, FIG. 6)

しかしながら、特許文献１の管切断装置にあっては、防護部材により、切り粉の歩進ネジ部への進入を防止しているものの、切削バイトが径方向に進むため、切削バイトの取付部が防護部材と干渉し、切削バイトの歩進不良が起こる虞がある。   However, in the tube cutting device of Patent Document 1, although the cutting member is prevented from entering the stepping screw portion by the protective member, the cutting bit advances in the radial direction. There is a possibility that the cutting tool may be stepped poorly due to interference with the protective member.

本発明は、このような問題点に着目してなされたもので、切削バイトの歩進不良が起こることなく切り粉の歩進ネジ部への進入を防止できる管切断装置を提供することを目的とする。   The present invention has been made paying attention to such problems, and an object of the present invention is to provide a tube cutting device capable of preventing chips from entering the stepping screw portion without causing a stepping failure of the cutting tool. And

前記課題を解決するために、本発明の管切断装置は、
分割構造を有するとともに開閉可能な開口部を備え既設流体管を水密に囲繞する筐体内で、既設流体管の所定箇所を切断する管切断装置であって、
前記既設流体管に固定に取付けられる本体部と、前記既設流体管の周方向に回転自在に該本体部に取付けられる切断ユニットと、該切断ユニットの回転経路近傍において前記本体部に固定に取付けられるキッカー部と、を備え、
前記切断ユニットは、前記既設流体管の周壁を前記周方向に沿って切削可能な切削バイトと、前記キッカー部と当接係合して軸回りに回転することで、前記切削バイトを前記既設流体管の径方向に進退させる歩進ネジ部と、を少なくとも有し、
前記切削バイトは、前記歩進ネジ部の外周部に連結する取付部と、前記既設流体管側に延び、該取付部よりも外方に位置し、前記既設流体管を切削する切削部と、を備え、
前記切断ユニットに、前記歩進ネジ部と前記既設流体管の外周面との間に配置され、前記既設流体管から排出される切り粉の前記歩進ネジ部への進入を防ぐ防護部材が設けられており、
前記防護部材は、少なくとも前記切削バイトの切削部近傍まで延設され、前記切断ユニットに固定された本体部と前記径方向に歩進する前記切削バイトの取付部と当接することで屈曲される当接部とを有し、前記切削バイトが内径方向に歩進することで前記当接部が前記取付部に形成されたテーパ面に面接触することを特徴としている。
この特徴によれば、防護部材が径方向に進退する取付部と当接することで屈曲されるため、防護部材が少なくとも切削部近傍まで延設して、取付部に形成されたテーパ面と面接触するので、切削部と防護部材との間に切り粉の進入を防ぐことができ、切り粉の歩進ネジ部への進入による歩進ネジ部の作動不良を防止することができる。また、防護部材の当接部が切削バイトの取付部と当接すると屈曲するので、その屈曲により、取付部が防護部材と当接することによる切削バイトの歩進不良が起こることなく、切削バイトの径方向の歩進量を増加させることができる。 In order to solve the above-mentioned problem, the tube cutting device of the present invention comprises:
A pipe cutting device that has a split structure and has an opening that can be opened and closed, and that cuts a predetermined portion of the existing fluid pipe in a casing that watertightly surrounds the existing fluid pipe,
A main body fixedly attached to the existing fluid pipe, a cutting unit attached to the main body so as to be rotatable in a circumferential direction of the existing fluid pipe, and fixedly attached to the main body near the rotation path of the cutting unit A kicker section, and
The cutting unit comprises a cutting tool capable of cutting a peripheral wall of the existing fluid pipe along the circumferential direction, and abutting engagement with the kicker portion, and rotating about the axis to thereby remove the cutting tool. A stepping screw part that advances and retracts in the radial direction of the tube, and
The cutting tool includes an attachment portion connected to an outer peripheral portion of the stepping screw portion, a cutting portion that extends to the existing fluid pipe side, is located outside the attachment portion, and cuts the existing fluid pipe; With
The cutting unit is provided with a protective member that is disposed between the stepping screw portion and the outer peripheral surface of the existing fluid pipe and prevents cutting chips discharged from the existing fluid pipe from entering the stepping screw portion. And
The protective member is extended to cut the vicinity of at least the cutting tool, those are bent by contact with the mounting portion of the cutting tool for stepping in the radial direction and fixed body portion to the cutting unit and a contact portion, wherein the cutting bit is characterized that you surface contact with the tapered surface formed on the abutment portion said mounting portion by being stepped radially inward.
According to this feature, since the protective member is bent by contacting the mounting portion that advances and retracts in the radial direction, the protective member extends at least to the vicinity of the cutting portion, and is in surface contact with the tapered surface formed on the mounting portion. Therefore, it is possible to prevent the chips from entering between the cutting portion and the protective member, and it is possible to prevent malfunction of the step screw portion due to the chips entering the step screw portion. Further, since the contact portion of the protection member is bent when it comes into contact with the mounting portion of the cutting tool, the bending of the cutting tool does not occur due to the bending of the attachment portion and the protection member. The amount of stepping in the radial direction can be increased.

本発明の管切断装置は、
前記防護部材は、前記径方向に歩進する切削部と当接するようになっていることを特徴としている。
この特徴によれば、防護部材が径方向に歩進する切削部と当接することで、切り粉が切削部と防護部材との間に進入することを確実に防止し、切り粉の歩進ネジ部への進入による歩進ネジ部の作動不良を効果的に防止することができる。 The tube cutting device of the present invention comprises:
The protective member is configured to come into contact with a cutting portion that advances in the radial direction.
According to this feature, the protective member abuts against the cutting portion that advances in the radial direction, so that the chips can be reliably prevented from entering between the cutting portion and the protective member. It is possible to effectively prevent malfunction of the stepping screw part due to the approach to the part.

本発明の管切断装置は、
前記切断ユニットは、前記歩進ネジ部を外周方向に沿って覆う筒状の開口を備えた被覆壁を更に有し、
前記防護部材は、前記開口を覆うように、前記被覆壁に取付けられていることを特徴としている。
この特徴によれば、防護部材により切り粉が被覆壁の開口から歩進ネジ部に進入することなく、被覆壁により飛散した切り粉が歩進ネジ部の周りに付着することを防止することができる。 The tube cutting device of the present invention comprises:
The cutting unit further includes a covering wall provided with a cylindrical opening that covers the stepped screw portion along the outer peripheral direction,
The protective member is attached to the covering wall so as to cover the opening.
According to this feature, it is possible to prevent the chips scattered by the covering wall from adhering around the stepping screw portion without entering the stepping screw portion from the opening of the covering wall by the protective member. it can.

既設流体管に移動割継輪が取付けられた状態を示す正面図である。It is a front view which shows the state by which the movement split ring was attached to the existing fluid pipe | tube. 下部ケースが既設流体管を囲繞して取付けられた状態を示す正面図である。It is a front view which shows the state in which the lower case was attached surrounding the existing fluid pipe | tube. 移動部材が取付座に取付けられた状態を示す一部断面図である。It is a partial cross section figure which shows the state in which the moving member was attached to the attachment seat. 上部ケースが既設流体管を囲繞して取付けられている状態を示す正面図である。It is a front view which shows the state in which the upper case is attached surrounding the existing fluid pipe | tube. 管切断装置が切除部に配置された状態を示す一部断面図である。It is a partial cross section figure which shows the state by which the tube cutting device has been arrange | positioned at the cutting part. 管切断装置を示す一部断面図である。It is a partial sectional view showing a tube cutting device. 管切断装置を示す一部側断面図である。It is a partial side sectional view showing a tube cutting device. （ａ）は、切除ユニットを示す正面図であり、（ｂ）は、同じく側面図であり、（ｃ）は、防護部材の部品図である。(A) is a front view which shows a cutting | disconnection unit, (b) is a side view similarly, (c) is component drawing of a protection member. （ａ）は、図６の切断ユニット及びキッカー部を示す断面図であり、（ｂ）は、（ａ）の上断面図である。(A) is sectional drawing which shows the cutting unit and kicker part of FIG. 6, (b) is an upper sectional view of (a). （ａ）は、図９（ａ）の状態から切削バイトが既設流体管の内径方向に移動している状態を示す断面図であり、（ｂ）は、（ａ）の状態から更に切削バイトが既設流体管の内径方向に移動した状態を示す断面図である。(A) is sectional drawing which shows the state which the cutting tool has moved to the internal diameter direction of the existing fluid pipe | tube from the state of Fig.9 (a), (b) is a cutting tool further from the state of (a). It is sectional drawing which shows the state which moved to the internal diameter direction of the existing fluid pipe | tube. 管切断装置が作業筒内に収容された状態を示す一部側断面図である。It is a partial sectional side view which shows the state in which the pipe cutting device was accommodated in the working cylinder. 伸縮継手部から駆動長軸が取外された状態を示す一部側断面図である。It is a partial sectional side view which shows the state from which the drive long axis was removed from the expansion joint part. 挿入ロッドが制水弁に取付けられた状態を示す一部断面図である。It is a partial cross section figure which shows the state in which the insertion rod was attached to the water control valve. 油圧移動手段により移動割継輪が制水弁に向けて移動している状態を示す一部断面図である。It is a partial cross section figure which shows the state which the movement split wheel is moving toward the water control valve by the hydraulic movement means. 挿入ロッドが引上げられている状態を示す一部断面図である。It is a partial cross section figure which shows the state by which the insertion rod is pulled up. 架設部材及びチェーンブロックにより制水弁が吊持された状態を示す正面図である。It is a front view which shows the state by which the water control valve was suspended by the construction member and the chain block. （ａ）は、制水弁回動手段が移動割継輪に設けられた状態を示す正面図であり、（ｂ）は、（ａ）の状態から９０°回動した制水弁の側面図である。(A) is a front view which shows the state by which the water control valve rotation means was provided in the movement split wheel, (b) is a side view of the water control valve rotated 90 degrees from the state of (a). It is. （ａ）は、制水弁に遮断装置が設けられた状態を示す正面図であり、（ｂ）は、同じく側面図である。(A) is a front view which shows the state by which the cutoff device was provided in the water control valve, (b) is a side view similarly.

本発明に係る管切断装置を実施するための形態を実施例に基づいて以下に説明する。   EMBODIMENT OF THE INVENTION The form for implementing the pipe | tube cutting device which concerns on this invention is demonstrated below based on an Example.

本発明の実施例を図１〜図１８に基づいて説明する。以下、図６の紙面手前側を管切断装置の正面側とし、図６の紙面左右側を管切断装置の左右側として説明する。   An embodiment of the present invention will be described with reference to FIGS. In the following description, the front side in FIG. 6 is the front side of the tube cutting device, and the left and right sides in FIG. 6 are the left and right sides of the tube cutting device.

一般に、地中に埋設され内部を上水が流れる既設流体管において、水の流れを制御するために既設流体管の所定箇所を切断して該所定箇所に緊急用の制水体が不断水状態で配置される。このような制水体は、例えば地震等の緊急時に、自動で制水体の遮断状態に制御される遮断装置を備えている。本実施例は、不断水状態で配置した制水体に遮断装置を取付けるまでの一連の工程について説明する。   Generally, in an existing fluid pipe that is buried in the ground and in which clean water flows inside, a predetermined portion of the existing fluid pipe is cut to control the flow of water, and an emergency water control body is in an undisturbed state in the predetermined portion. Be placed. Such a water control body includes a shut-off device that is automatically controlled in a shut-off state of the water control body in an emergency such as an earthquake. In this embodiment, a series of steps until a shutoff device is attached to a water control body arranged in an unrestricted water state will be described.

図１の符号Ｐは、土壌に埋設され内部を流れる流体が上水である既設流体管であって、先ず、既設流体管Ｐの清掃後、既設流体管Ｐを、Ｈ鋼及びコンクリートによる固定部材１０１，１０１にて補強及び固定する。   1 is an existing fluid pipe in which the fluid embedded in the soil and flowing through the inside is clean water. First, after cleaning the existing fluid pipe P, the existing fluid pipe P is fixed to H steel and concrete. Reinforce and fix at 101,101.

次いで、既設流体管Ｐを切断して管片を除去する箇所である切除部Ｋの上流側及び下流側における既設流体管Ｐの外周に、制水体としての制水弁４２の端部４２ｃ，４２ｄ及び既設流体管Ｐの切断部Ｚ，Ｚ（図１３参照）に水密に架設される２つ割リング構造の移動割継輪Ｒ，Ｒを周方向に沿って夫々取付ける。この移動割継輪Ｒ，Ｒは、内周面にパッキンが配設されており、後述のように制水弁４２が切除部Ｋに設置された後、制水弁４２と既設流体管Ｐとに水密に架設されるようになっている（図１３参照）。   Next, end portions 42c and 42d of the water control valve 42 as a water control body are provided on the outer periphery of the existing fluid pipe P on the upstream side and the downstream side of the excision part K where the existing fluid pipe P is cut and the pipe pieces are removed. In addition, the movable split rings R, R having a split ring structure that is watertightly installed on the cut portions Z, Z (see FIG. 13) of the existing fluid pipe P are respectively attached along the circumferential direction. The movable split wheels R, R are provided with packing on the inner peripheral surface, and after the water control valve 42 is installed in the excision part K as described later, the water control valve 42 and the existing fluid pipe P It is constructed in a watertight manner (see FIG. 13).

尚、後述する油圧移動手段にて移動割継輪Ｒ，Ｒを既設流体管Ｐの管軸方向に潤滑に移動させるために、パッキン及び既設流体管Ｐの外周面に予め滑剤を塗布しておく。   Note that a lubricant is applied in advance to the outer peripheral surface of the packing and the existing fluid pipe P in order to lubricate and move the moving split wheels R, R in the direction of the pipe axis of the existing fluid pipe P by hydraulic movement means described later. .

そして、移動割継輪Ｒ，Ｒを既設流体管Ｐの外面に周方向に沿って夫々取付けた後、移動割継輪Ｒ，Ｒの水圧テストを行う。水圧テストは、移動割継輪Ｒ，Ｒの間に、図示しない水圧テスト用の二分割構造の夫々の押輪を、移動割継輪Ｒ，Ｒに取付けて移動割継輪Ｒ，Ｒの内部を密封状態にするとともに、移動割継輪Ｒ，Ｒの中央位置（図示沈みプラグＲａの取付位置）に図示しない水圧計を取付け、移動割継輪Ｒ，Ｒに所定の水圧をかけ、漏水の有無を確認する。   Then, after attaching the moving split wheels R, R to the outer surface of the existing fluid pipe P along the circumferential direction, a water pressure test of the moving split wheels R, R is performed. In the water pressure test, a two-split structure for water pressure test (not shown) is attached between the moving split wheels R and R to the moving split wheels R and R so that the inside of the moving split wheels R and R is installed. A water pressure gauge (not shown) is attached to the central position of the moving split wheels R, R (the mounting position of the sinking plug Ra shown), and a predetermined water pressure is applied to the moving split wheels R, R to check for leakage. Confirm.

この水圧テストで漏水の無いことを確認した後、水圧計を取外し、該水圧計を取外した位置に沈みプラグＲａを取付けた後に、移動割継輪Ｒ，Ｒの一端部に形成されたフランジＲｂ，Ｒｂに前記油圧移動手段を構成する後述の移動部材６４（図３参照）を取付けるための取付座Ｒｃをボルト等にて取付ける。   After confirming that there is no water leakage in this water pressure test, after removing the water pressure gauge and attaching the sink plug Ra to the position where the water pressure gauge was removed, the flange Rb formed at one end of the moving splice wheels R, R , Rb, a mounting seat Rc for mounting a moving member 64 (see FIG. 3), which will be described later, constituting the hydraulic moving means is mounted with a bolt or the like.

次いで、筐体２を用いて既設流体管Ｐを水密に囲繞する筐体囲繞工程を行う（図５参照）。ここで、筐体２の構造について説明すると、図５に示されるように、筐体２は、分割構造であって、主に、２分割構造の上部ケース２ｄ及び下部ケース２ｅと、内部に弁体２ｂを備えた開閉弁２ａと、から構成されている。   Next, a housing surrounding process is performed in which the existing fluid pipe P is surrounded in a watertight manner using the housing 2 (see FIG. 5). Here, the structure of the housing 2 will be described. As shown in FIG. 5, the housing 2 has a split structure, and mainly includes an upper case 2d and a lower case 2e having a split structure, and a valve inside. And an on-off valve 2a provided with a body 2b.

図５に示されるように、上部ケース２ｄは、下部ケース２ｅとにより既設流体管Ｐをその外周面に沿って囲繞するものであり、図２に示されるように、下部ケース２ｅには、ジャッキ７５により支持され、下部ケース２ｅの図示前後方向に突出する支持部材Ｗが形成されている。   As shown in FIG. 5, the upper case 2d surrounds the existing fluid pipe P along the outer peripheral surface by the lower case 2e. As shown in FIG. A support member W that is supported by 75 and protrudes in the front-rear direction of the lower case 2e is formed.

また、図１４に示されるように、上部ケース２ｄ及び下部ケース２ｅの側方開口部には、夫々既設流体管Ｐの外面付近の片側で４箇所（両側で８箇所）において、油圧移動手段を構成する延長ロッド６６の外径と略同径の内径を有するロッドガイドＬが、筐体２の内方に向かって管軸方向に延設されている。   Further, as shown in FIG. 14, hydraulic movement means are provided in the side openings of the upper case 2 d and the lower case 2 e at four locations on one side (eight locations on both sides) near the outer surface of the existing fluid pipe P, respectively. A rod guide L having an inner diameter that is substantially the same as the outer diameter of the extension rod 66 that is formed extends in the tube axis direction toward the inside of the housing 2.

図５に示されるように、開閉弁２ａは、内部に弁体２ｂを備え、上部ケース２ｄの上部に取外可能に設けられており、この開閉弁２ａが、本発明の開閉可能な開口部を構成している。開閉弁２ａの上部には、筐体２と開状態の開閉弁２ａを介し水密に連通する作業筒１１及び蓋部１２が取外し可能に設けられる。   As shown in FIG. 5, the on-off valve 2 a includes a valve body 2 b inside, and is detachably provided on the upper part of the upper case 2 d. The on-off valve 2 a is an opening that can be opened and closed according to the present invention. Is configured. A work cylinder 11 and a lid 12 that are in watertight communication with the housing 2 via the open / close valve 2a are provided on the open / close valve 2a so as to be removable.

蓋部１２には、作業筒１１内の空気を抜く空気抜きコック１２０，１２０と、一端側が作業筒１１の外方まで延びる駆動長軸１０６を挿通する挿通孔１２ａと、駆動長軸１０６を挿通孔１２ａに挿通された状態で筐体２及び作業筒１１内の密封状態を維持する密封材１１２と、が設けられている。尚、密封材１１２は、挿通孔１２ａに嵌合した状態で蓋部１２の上部に取付けられ、駆動長軸１０６が密封材１１２に水密に挿通されている。   In the lid portion 12, air vent cocks 120, 120 that vent the air in the work cylinder 11, an insertion hole 12 a through which one end side extends to the outside of the work cylinder 11, and an insertion hole through which the drive long axis 106 is inserted. A sealing material 112 is provided that maintains a sealed state in the housing 2 and the work cylinder 11 in a state of being inserted through the 12a. In addition, the sealing material 112 is attached to the upper part of the cover part 12 in the state fitted to the insertion hole 12a, and the drive long shaft 106 is inserted into the sealing material 112 in a watertight manner.

作業筒１１には、制水弁４２（図１３参照）及び管切断装置１を仮置きするための後述の仮受台５５，５５（図１１参照）と、作業筒１１内に残留する上水を排水する排水用コック１１０，１１０と、が設けられている。   In the work cylinder 11, the water control valve 42 (see FIG. 13) and temporary receiving stands 55 and 55 (see FIG. 11) for temporarily placing the pipe cutting device 1, and the water remaining in the work cylinder 11 are disposed. The drain cocks 110 and 110 for draining the water are provided.

更に、図１０に示されるように、作業筒１１内側面には、管切断装置１及び制水弁４２（図１１参照）を後述の仮受台５５，５５の配置部５６に案内する案内部１３，１３が、仮受台５５，５５が設けられている箇所を除いて上部及び下部に架けて図示左右にそれぞれ設けられている。   Further, as shown in FIG. 10, on the inner surface of the work cylinder 11, a guide portion that guides the pipe cutting device 1 and the water control valve 42 (see FIG. 11) to an arrangement portion 56 of temporary supports 55 and 55 described later. 13 and 13 are provided on the left and right sides of the drawing, extending over the upper and lower portions, except for the places where the temporary mounts 55 and 55 are provided.

仮受台５５は、上部に取付部材２９を載置して配置するための平坦面５６ｄが形成され、図示左右方向に進退移動可能な配置部５６と、配置部５６を収容する取付部５７と、取付部５７に嵌挿され、配置部５６の進退移動を操作するための操作部５８と、から構成されている。   The provisional table 55 has a flat surface 56d for placing and mounting the mounting member 29 on the top, a mounting portion 57 that can move forward and backward in the horizontal direction in the figure, and a mounting portion 57 that houses the mounting portion 56. The operation portion 58 is inserted into the attachment portion 57 and operates to move the arrangement portion 56 forward and backward.

次に、筐体囲繞工程について説明すると、図２に示されるように、先ず、既設流体管Ｐを水密に囲繞する筐体２の下部ケース２ｅ内に、筐体２内で既設流体管Ｐの切除部Ｋを切断する管切断装置１におけるガイド部４の下ガイド４ｂ（図６参照）を支持した状態で、懸吊手段１０２にて下部ケース２ｅ及び下ガイド４ｂを既設流体管Ｐの図示下側における外周面を囲繞するように配置し、複数のジャッキ７５で下部ケース２ｅの支持部材Ｗを支持する。   Next, the casing surrounding process will be described. As shown in FIG. 2, first, in the lower case 2 e of the casing 2 that surrounds the existing fluid pipe P in a watertight manner, the existing fluid pipe P is formed in the casing 2. In the state where the lower guide 4b (see FIG. 6) of the guide part 4 in the pipe cutting device 1 for cutting the excision part K is supported, the lower case 2e and the lower guide 4b are shown below the existing fluid pipe P by the suspension means 102. It arrange | positions so that the outer peripheral surface in the side may be surrounded, and the supporting member W of the lower case 2e is supported with the some jack 75. FIG.

具体的には、ジャッキ７５の先端凸部７５ａが、支持部材Ｗに形成された挿通孔に挿通して下部ケース２ｅを支持するとともに、下部ケース２ｅの上下位置が既設流体管Ｐの管軸に対し略平行となるように夫々のジャッキ７５を調整し、下部ケース２ｅが位置決めされるようになっている。   Specifically, the tip convex portion 75a of the jack 75 is inserted into an insertion hole formed in the support member W to support the lower case 2e, and the vertical position of the lower case 2e is set to the tube axis of the existing fluid pipe P. Each jack 75 is adjusted so as to be substantially parallel to the lower case 2e so that the lower case 2e is positioned.

これら下部ケース２ｅ及び下ガイド４ｂが配置された後に、既設流体管Ｐの外部に漏水を防止するパッキン６９，６９と、パッキン６９の水密性を維持する押輪Ｑ，Ｑと、ゴム輪６８，６８と、を切除部Ｋの上流側及び下流側における既設流体管Ｐの外周面に夫々配置する。   After the lower case 2e and the lower guide 4b are disposed, packings 69 and 69 for preventing water leakage outside the existing fluid pipe P, push rings Q and Q for maintaining the water tightness of the packing 69, and rubber rings 68 and 68 Are arranged on the outer peripheral surface of the existing fluid pipe P on the upstream side and the downstream side of the cut portion K, respectively.

次いで、図３に示されるように、前述した油圧移動手段を構成する移動部材６４を図示下側の移動割継輪Ｒにおける取付座Ｒｃに取付ける。具体的には、移動部材６４は、主に延長ロッド６６と油圧ジャッキ６５から成り、延長ロッド６６を前述した下部ケース２ｅのロッドガイドＬ内を嵌挿させて取付座Ｒｃに取付けるとともに、ロッドガイドＬの端面に固定的に油圧ジャッキ６５のシリンダ６５ｂを取付ける。   Next, as shown in FIG. 3, the moving member 64 that constitutes the hydraulic moving means described above is attached to the attachment seat Rc in the lower moving connecting wheel R in the drawing. Specifically, the moving member 64 mainly includes an extension rod 66 and a hydraulic jack 65, and the extension rod 66 is fitted into the rod guide L of the lower case 2e described above to be attached to the mounting seat Rc. The cylinder 65b of the hydraulic jack 65 is fixedly attached to the end face of L.

ここで、シリンダ６５ｂ内にはロッド６５ａが収容されており、このロッド６５ａが延長ロッド６６の先端に接続され、シリンダ６５ｂ内に作動油が供給されることにより、ロッド６５ａが切除部Ｋに向かって移動するとともに、該ロッド６５ａに接続された延長ロッド６６がロッド６５ａに追随して移動し、延長ロッド６６に取付けられた取付座Ｒｃに接続された移動割継輪Ｒが切除部Ｋ側に向かって移動可能になっている。尚、油圧移動手段は、移動部材６４の他、後述の油圧ユニット６３及び油圧ホースＨから構成されている（図１４参照）。   Here, a rod 65a is accommodated in the cylinder 65b. This rod 65a is connected to the tip of the extension rod 66, and hydraulic oil is supplied into the cylinder 65b, so that the rod 65a faces the cut portion K. The extension rod 66 connected to the rod 65a moves following the rod 65a, and the moving split ring R connected to the mounting seat Rc attached to the extension rod 66 is moved to the cut portion K side. It can move toward. The hydraulic movement means includes a hydraulic unit 63 and a hydraulic hose H, which will be described later, in addition to the moving member 64 (see FIG. 14).

移動割継輪Ｒの図示下側における取付座Ｒｃに延長ロッド６６及び油圧ジャッキ６５を接続した後に、図４に示されるように、管切断装置１を筐体２内で切除部Ｋに配置する。   After connecting the extension rod 66 and the hydraulic jack 65 to the mounting seat Rc on the lower side of the moving split ring R in the drawing, the pipe cutting device 1 is disposed in the cutout K in the housing 2 as shown in FIG. .

ここで、管切断装置１の構造について説明すると、図６及び図７に示されるように、管切断装置１は、主に既設流体管Ｐに固定に取付けられる本体部としてのガイド部４と、既設流体管Ｐの円周方向に回転自在に取付けられる切断ユニット３と、切断ユニット３の回転経路近傍においてガイド部４に固定に取付けられるキッカー部３０と、後述の駆動モータ６が発生した回転駆動力が後述の伸縮継手部１０７を介して伝達されることで切断ユニット３を回転駆動させる駆動伝達部５と、から成る。また、既設流体管Ｐの外側に水密的に密封された筐体２内において、ガイド部４を構成する２分割構造の上ガイド４ａ及び下ガイド４ｂが、既設流体管Ｐの外周面に固定保持される（図５参照）。   Here, the structure of the tube cutting device 1 will be described. As shown in FIGS. 6 and 7, the tube cutting device 1 mainly includes a guide portion 4 as a main body portion fixedly attached to an existing fluid pipe P, A cutting unit 3 that is rotatably mounted in the circumferential direction of the existing fluid pipe P, a kicker unit 30 that is fixedly attached to the guide unit 4 in the vicinity of the rotation path of the cutting unit 3, and a rotational drive generated by a drive motor 6 described later. It comprises a drive transmission unit 5 that rotationally drives the cutting unit 3 by transmitting force through an expansion joint unit 107 described later. Further, the upper guide 4a and the lower guide 4b constituting the guide portion 4 are fixedly held on the outer peripheral surface of the existing fluid pipe P in the casing 2 that is watertightly sealed outside the existing fluid pipe P. (See FIG. 5).

尚、上ガイド４ａ及び下ガイド４ｂの周方向に沿って設けられた複数のボルト２８が、内径方向に螺挿され既設流体管Ｐの外周面に当接することにより、上ガイド４ａ及び下ガイド４ｂが既設流体管Ｐに対し位置決めして固定されるようになっている。また、上ガイド４ａ及び下ガイド４ｂには、前述した作業筒１１の仮受台５５に支持される取付部材２９が着脱可能に設けられている。   A plurality of bolts 28 provided along the circumferential direction of the upper guide 4a and the lower guide 4b are screwed in the inner diameter direction and come into contact with the outer peripheral surface of the existing fluid pipe P, whereby the upper guide 4a and the lower guide 4b. Is positioned and fixed with respect to the existing fluid pipe P. Further, the upper guide 4a and the lower guide 4b are detachably provided with an attachment member 29 supported by the temporary support base 55 of the work cylinder 11 described above.

ガイド部４の上部には、後述の伸縮継手部１０７に固定に連結される駆動軸７’と、駆動軸７’の先端部に設けられた歯車７ａ’と噛合する歯車７ａを有する駆動軸７と、回転駆動力を発生する駆動モータ６により駆動長軸１０６、伸縮継手部１０７、及び駆動軸７’を介して回転駆動力が付与される駆動軸７の両端に設けられた一対の駆動スプロケット８と、から成る前述の駆動伝達部５が連結されており、駆動モータ６は筐体２外部に突出して駆動伝達部５に取外し可能に配設されるようになっている（図５参照）。   A drive shaft 7 having a drive shaft 7 ′ fixedly connected to an expansion joint portion 107, which will be described later, and a gear 7 a meshing with a gear 7 a ′ provided at the tip of the drive shaft 7 ′ are provided on the upper portion of the guide portion 4. And a pair of drive sprockets provided at both ends of the drive shaft 7 to which the rotational drive force is applied via the drive long shaft 106, the expansion joint 107, and the drive shaft 7 'by the drive motor 6 that generates the rotational drive force. 8 is connected to the above-described drive transmission unit 5, and the drive motor 6 protrudes outside the housing 2 and is detachably disposed on the drive transmission unit 5 (see FIG. 5). .

ガイド部４の両端部には、上下２分割構造の上部スプロケット９ａ及び下部スプロケット９ｂから成り、既設流体管Ｐの円周方向に回転自在な一対の従動スプロケット９が配設されている。   A pair of driven sprockets 9 which are composed of an upper sprocket 9a and a lower sprocket 9b having a vertically divided structure and are rotatable in the circumferential direction of the existing fluid pipe P are disposed at both ends of the guide portion 4.

ガイド部４の両端部には、図９（ａ）に示されるように、既設流体管Ｐの外周回りに、固定リング３３が突設されている。従動スプロケット９の背面には、固定リング３３に嵌合可能な凹部が形成されており、従動スプロケット９は、既設流体管Ｐの管軸回りに摺動可能に固定リング３３に嵌合されている。   As shown in FIG. 9A, fixing rings 33 protrude from the both ends of the guide portion 4 around the outer periphery of the existing fluid pipe P. A recess that can be fitted to the fixed ring 33 is formed on the back surface of the driven sprocket 9, and the driven sprocket 9 is fitted to the fixed ring 33 so as to be slidable around the pipe axis of the existing fluid pipe P. .

固定リング３３に嵌合された従動スプロケット９の背面には、背面リング３２が複数の背面止めボルト４０により従動スプロケット９と一体化されており、従動スプロケット９が、固定リング３３から脱落しないように保持されつつ、既設流体管Ｐの管軸回りに回転可能となっている。   The back ring 32 is integrated with the driven sprocket 9 by a plurality of back locking bolts 40 on the back of the driven sprocket 9 fitted to the fixed ring 33 so that the driven sprocket 9 does not fall off the fixed ring 33. While being held, it can rotate around the pipe axis of the existing fluid pipe P.

一対の従動スプロケット９は、図７に示されるように、上部の一対の駆動スプロケット８と巻回された無端チェーン１０を介してそれぞれ接続されている。前述した駆動モータ６を作動することで、該駆動モータ６が取付けられる駆動長軸１０６と、駆動長軸１０６が着脱可能に連結される伸縮継手部１０７と、駆動軸７’，７と、を介して駆動スプロケット８が駆動され、この駆動により回転力が従動スプロケット９に付与され、従動スプロケット９が既設流体管Ｐの外周を周回する。   As shown in FIG. 7, the pair of driven sprockets 9 are connected to the upper pair of drive sprockets 8 via an endless chain 10 that is wound. By operating the drive motor 6 described above, a drive long shaft 106 to which the drive motor 6 is attached, an expansion joint portion 107 to which the drive long shaft 106 is detachably connected, and drive shafts 7 'and 7 are provided. The driving sprocket 8 is driven through this, and a rotational force is applied to the driven sprocket 9 by this driving, and the driven sprocket 9 goes around the outer periphery of the existing fluid pipe P.

また、一対の従動スプロケット９の外面には、切断ユニット３が等間隔に４箇所ずつ固着配設され、従動スプロケット９の回転とともに既設流体管Ｐの外周を回転可能となり、切断ユニット３に設けられた切削バイト１９により既設流体管Ｐを外周回りに切断できるようになっている。つまり、切断ユニット３は、従動スプロケット９を介してガイド部４に取付けられるようになっている。   Further, the cutting units 3 are fixedly arranged at four locations at equal intervals on the outer surfaces of the pair of driven sprockets 9, and the outer periphery of the existing fluid pipe P can be rotated along with the rotation of the driven sprockets 9. The existing fluid pipe P can be cut around the outer periphery by the cutting tool 19. That is, the cutting unit 3 is attached to the guide portion 4 via the driven sprocket 9.

切断ユニット３について詳しく説明すると、図６〜図９に示されるように、切断ユニット３は、主に、前述した切削バイト１９と、切削バイト１９を固定に支持する支持部材１８を備え、軸回りに回転することで切削バイト１９及び支持部材１８を既設流体管Ｐの径方向に進退させる歩進ネジ部２０と、歩進ネジ部２０を外周方向に沿って覆う筒状の開口Ｕを備えた被覆壁としてのベース部材１４及びプレート部材１４ａと、ベース部材１４に固定連設され歩進ネジ部２０を回動可能に嵌挿する軸支部材１５と、歩進ネジ部２０と既設流体管Ｐの外周面との間に配置され、既設流体管Ｐから排出される切り粉の歩進ネジ部２０への進入を防ぐ防護部材１６と、を有している。   The cutting unit 3 will be described in detail. As shown in FIGS. 6 to 9, the cutting unit 3 mainly includes the cutting bit 19 described above and a support member 18 that supports the cutting bit 19 in a fixed manner. Are provided with a stepping screw portion 20 that causes the cutting tool 19 and the support member 18 to advance and retreat in the radial direction of the existing fluid pipe P, and a cylindrical opening U that covers the stepping screw portion 20 along the outer peripheral direction. The base member 14 and the plate member 14a as the covering wall, the shaft support member 15 fixedly connected to the base member 14 and rotatably inserted into the step screw portion 20, the step screw portion 20 and the existing fluid pipe P And a protective member 16 that prevents the chips discharged from the existing fluid pipe P from entering the stepping screw portion 20.

図８（ａ）及び図９（ａ）に示されるように、切削バイト１９は、支持部材１８の外周部に連結する取付部１９ｂと、既設流体管Ｐ側に延び、取付部１９ｂよりも外方に位置し、既設流体管Ｐを切削する切削部１９ａと、を備えている。またプレート部材１４ａは、長穴１４ｂに挿通したネジ１４ｃによりベース部材１４に取り付けられることで、ベース部材１４の図示しない開放部を被覆している。そしてプレート部材１４ａをベース部材１４に対し長穴１４ｂに沿って移動させることで、前記開放部を開放し、切削バイト１９を支持部材１８に脱着できるようになっている。   As shown in FIGS. 8A and 9A, the cutting tool 19 includes a mounting portion 19b connected to the outer peripheral portion of the support member 18 and an existing fluid pipe P side. And a cutting portion 19a for cutting the existing fluid pipe P. The plate member 14a is attached to the base member 14 with a screw 14c inserted through the elongated hole 14b, thereby covering an open portion (not shown) of the base member 14. Then, by moving the plate member 14 a along the elongated hole 14 b with respect to the base member 14, the opening portion is opened, and the cutting tool 19 can be attached to and detached from the support member 18.

図９（ａ）、（ｂ）に示されるように、歩進ネジ部２０は、支持部材１８に螺合するネジ部１７ａを有する軸部材１７と、該軸部材１７の図９（ａ）上部に設けられる回転羽根２１と、から成り、この回転羽根２１は、後述のキッカー部３０のキッカー片３１と当接係合可能な当接部２１ａと、軸支部材１５に設けられた負荷部材２３を嵌合可能な凹部を有する嵌合部２１ｂと、を有している。図８（ａ）及び図９（ｂ）に示されるように、負荷部材２３は、その内部にバネ体を有しており、バネ体の弾性力により嵌合部２１ｂへ押圧付勢される。   As shown in FIGS. 9A and 9B, the stepping screw portion 20 includes a shaft member 17 having a screw portion 17a screwed to the support member 18, and an upper portion of the shaft member 17 in FIG. 9A. The rotary blade 21 includes a contact portion 21a that can contact and engage with a kicker piece 31 of a kicker portion 30 described later, and a load member 23 provided on the shaft support member 15. And a fitting portion 21b having a recess capable of fitting. As shown in FIGS. 8A and 9B, the load member 23 has a spring body therein and is pressed and urged to the fitting portion 21b by the elastic force of the spring body.

図８（ａ）〜（ｃ）及び図９（ａ）に示されるように、防護部材１６は、ゴム等の弾性材から成る屈曲可能な屈曲部材であって、ベース部材１４の開口Ｕを覆い、かつ取付部１９ｂに形成されたテーパ面１９ｃと当接する前の状態において、切削部１９ａと当接するように、ベース部材１４に取付けられている。   As shown in FIGS. 8A to 8C and FIG. 9A, the protective member 16 is a bendable bending member made of an elastic material such as rubber, and covers the opening U of the base member 14. And, it is attached to the base member 14 so as to come into contact with the cutting portion 19a in a state before coming into contact with the tapered surface 19c formed in the attachment portion 19b.

また、防護部材１６は、ベース部材１４に固定される本体部１６ａと、内径方向に移動する取付部１９ｂと当接する当接部１６ｂと、を有している。この当接部１６ｂは、防護部材１６の一側辺から内方に向かう２箇所の切り込みＤ，Ｄにより形成され、本体部１６ａに対して屈曲可能になっている。尚、防護部材１６の切り込みＤ，Ｄは、一側辺から内方に浅く形成されているため、取付部１９ｂが当接部１６ｂと当接していない場合には、当接部１６ｂと本体部１６ａとが略同一平面上に位置している。   Further, the protection member 16 has a main body portion 16a fixed to the base member 14, and an abutting portion 16b that abuts on an attachment portion 19b that moves in the inner diameter direction. The contact portion 16b is formed by two cuts D and D directed inward from one side of the protection member 16, and can be bent with respect to the main body portion 16a. Since the notches D and D of the protective member 16 are shallowly formed inward from one side, when the attachment portion 19b is not in contact with the contact portion 16b, the contact portion 16b and the main body portion are formed. 16a is located on substantially the same plane.

図６、図７、及び図９（ａ）、（ｂ）に示されるように、キッカー部３０は、回転経路に沿って上ガイド４ａの図６左右に夫々配設され、上ガイド４ａに複数のネジ１３０により固定に取付けられる固定部２７と、後述のキッカー片３１の歩進ネジ部２０に対する当接量を調整する調整部２６と、キッカー片３１を、既設流体管Ｐの円周方向に回転する歩進ネジ部２０と当接係合する後述の当接位置と、歩進ネジ部２０との当接係合を避ける後述の退避位置と、の間を移動自在にする操作部２５と、を有している。   As shown in FIGS. 6, 7, and 9 (a) and 9 (b), the kicker portions 30 are arranged on the left and right of the upper guide 4 a along the rotation path, respectively, and a plurality of upper guides 4 a are provided. The fixing portion 27 fixedly attached by the screw 130, the adjusting portion 26 for adjusting the contact amount of the kicker piece 31 described later with respect to the stepping screw portion 20, and the kicker piece 31 are arranged in the circumferential direction of the existing fluid pipe P. An operation unit 25 that is movable between a later-described abutment position that abuts and engages with the rotating stepping screw part 20 and a later-described retraction position that avoids abutment engagement with the stepping screw part 20; ,have.

調整部２６は、主に、当接位置に配置され、歩進ネジ部２０を軸回りに回転させるキッカー片３１と、固定部２７に対して相対移動可能な移動部材１２１と、移動部材１２１に固定に取付けられ、キッカー片３１を一部収容する収容部材１２５と、キッカー片３１を押圧するカム部材１２３と、カム部材１２３と連結するネジ部材１２７と、移動部材１２１に固定に取付けられ、ネジ部材１２７を回動可能に支持するネジ支持部材１２８と、を備えている。カム部材１２３は、短径部１２３ａと長径部１２３ｂとを有する偏心した形状となっている。   The adjustment unit 26 is mainly disposed at the contact position, and the kicker piece 31 that rotates the stepping screw unit 20 around the axis, the moving member 121 that can move relative to the fixing unit 27, and the moving member 121 The fixing member is fixedly attached to the housing member 125 that partially accommodates the kicker piece 31, the cam member 123 that presses the kicker piece 31, the screw member 127 that is connected to the cam member 123, and the moving member 121. And a screw support member 128 that rotatably supports the member 127. The cam member 123 has an eccentric shape having a short diameter portion 123a and a long diameter portion 123b.

図９（ｂ）に示されるように、移動部材１２１には、長丸状の挿通孔１２１ａが複数形成されており、この挿通孔１２１ａと、該挿通孔１２１ａに対応する固定部２７に形成された図示しないネジ孔と、に一体的にボルト１２２を挿通することで、ボルト１２２が長丸状の挿通孔１２１ａに遊嵌した状態で、移動部材１２１が固定部２７に固定される。よって、この移動部材１２１の構成により、調整部２６が固定部２７に対して移動可能に支持される。   As shown in FIG. 9B, the moving member 121 is formed with a plurality of elongated circular insertion holes 121a, which are formed in the insertion hole 121a and the fixing portion 27 corresponding to the insertion hole 121a. By inserting the bolt 122 integrally into a screw hole (not shown), the moving member 121 is fixed to the fixing portion 27 in a state where the bolt 122 is loosely fitted into the elongated circular insertion hole 121a. Therefore, with the configuration of the moving member 121, the adjustment unit 26 is supported so as to be movable with respect to the fixed unit 27.

尚、移動部材１２１は、固定部２７の図示上下に形成され、紙面手前側に延びるガイド部２７ａ，２７ａ内に嵌合されており、移動部材１２１が、このガイド部２７ａ，２７ａにより案内されることで、キッカー片３１の位置を図示上下方向に位置ずれすることなく図示左右方向に調整できるようになっている。   The moving member 121 is formed on the upper and lower sides of the fixed portion 27 and is fitted in guide portions 27a and 27a extending to the front side of the drawing. The moving member 121 is guided by the guide portions 27a and 27a. Thus, the position of the kicker piece 31 can be adjusted in the horizontal direction in the figure without being displaced in the vertical direction in the figure.

収容部材１２５には、キッカー片３１を一部収容する収容孔１２５ａが形成されており、この収容孔１２５ａ内における図示右方側には、収容部材１２５に対して固定されてリング部材１２４が配置される。   The housing member 125 is formed with a housing hole 125a for housing a part of the kicker piece 31, and a ring member 124 is fixed to the housing member 125 on the right side in the drawing in the housing hole 125a. Is done.

また、このリング部材１２４と、キッカー片３１に固定に取付けられたリング状の止輪１２６と、の間には、キッカー片３１に挿通されて弾性部材２４が配置される。   Further, between the ring member 124 and a ring-shaped retaining ring 126 fixedly attached to the kicker piece 31, the elastic member 24 is inserted through the kicker piece 31.

カム部材１２３は、当初、その短径部１２３ａが、キッカー片３１の図示左端部と当接し、かつ前述のネジ部材１２７と、該ネジ部材１２７に連結された連結片１２９と、を介して操作部２５に接続されており、操作部２５を回動することで、カム部材１２３が回動し、カム部材１２３の長径部１２３ｂがキッカー片３１と当接するため、図示実線のキッカー片３１が図示右方に向かって移動する（図９（ｂ）一点鎖線参照）。   The cam member 123 is initially operated through the screw member 127 and the connecting piece 129 connected to the screw member 127, with the short diameter portion 123a abutting the illustrated left end portion of the kicker piece 31. Since the cam member 123 is rotated by rotating the operation unit 25 and the long diameter portion 123b of the cam member 123 is in contact with the kicker piece 31, the solid line kicker piece 31 is illustrated. It moves toward the right (see the dashed line in FIG. 9B).

図９（ｂ）において、実線で示すように、カム部材１２３の短径部１２３ａと当接するキッカー片３１の位置が、歩進ネジ部２０の回転羽根２１との当接係合を避ける退避位置となっており、一点鎖線で示すように、カム部材１２３の長径部１２３ｂと当接するキッカー片３１の位置が、歩進ネジ部２０の回転羽根２１と当接係合する当接位置となっている。   In FIG. 9B, as shown by the solid line, the position of the kicker piece 31 that contacts the short diameter portion 123a of the cam member 123 is the retracted position that avoids contact engagement with the rotary blade 21 of the stepping screw portion 20. As shown by the alternate long and short dash line, the position of the kicker piece 31 in contact with the long diameter portion 123b of the cam member 123 becomes the contact position in contact with and engaging with the rotary blade 21 of the stepping screw portion 20. Yes.

また、前述したように、リング部材１２４と、リング部材１２４と止輪１２６との間に弾性部材２４が配置されているため、キッカー片３１が退避位置から当接位置に移動するように操作部２５を回動することで、キッカー片３１の止輪１２６がリング部材１２４に対して近づき、弾性部材２４が止輪１２６及びリング部材１２４により挟持される。   Further, as described above, since the elastic member 24 is disposed between the ring member 124 and the ring member 124 and the retaining ring 126, the operation unit is configured to move the kicker piece 31 from the retracted position to the contact position. By rotating 25, the retaining ring 126 of the kicker piece 31 approaches the ring member 124, and the elastic member 24 is held between the retaining ring 126 and the ring member 124.

一方、キッカー片３１の当接位置から操作部２５を回動することで、キッカー片３１がカム部材１２３との当接状態を維持するように、弾性部材２４の弾性復帰力が止輪１２６に作用し、この弾性復帰力により、キッカー片３１が当接位置から退避位置に戻る。   On the other hand, by rotating the operation unit 25 from the contact position of the kicker piece 31, the elastic return force of the elastic member 24 is applied to the retaining ring 126 so that the kicker piece 31 maintains the contact state with the cam member 123. The kicker piece 31 returns from the contact position to the retracted position by this elastic return force.

このように、既設流体管Ｐの円周方向に回転する切断ユニット３の回転経路近傍には、キッカー部３０が上ガイド４ａの外側面に固定配設されており、キッカー部３０にはキッカー片３１が歩進ネジ部２０を回動可能に突設されている。よって、既設流体管Ｐの円周方向に回転動作する切断ユニット３がキッカー部３０の近傍を通過する際に、歩進ネジ部２０の回転羽根２１の当接部２１ａが、キッカー片３１と当接係合し、切断ユニット３がキッカー部３０の近傍を通過し終えて、係合が解除されるまで回転羽根２１が所定量回転することになる（図６及び図７参照）。   Thus, in the vicinity of the rotation path of the cutting unit 3 that rotates in the circumferential direction of the existing fluid pipe P, the kicker portion 30 is fixedly disposed on the outer surface of the upper guide 4a, and the kicker portion 30 includes a kicker piece. 31 protrudes so that the stepping screw part 20 can be rotated. Therefore, when the cutting unit 3 that rotates in the circumferential direction of the existing fluid pipe P passes through the vicinity of the kicker portion 30, the contact portion 21 a of the rotary blade 21 of the stepping screw portion 20 contacts the kicker piece 31. The rotating blade 21 rotates by a predetermined amount until the engagement is released and the cutting unit 3 finishes passing through the vicinity of the kicker portion 30 and the engagement is released (see FIGS. 6 and 7).

したがって、切断ユニット３が既設流体管Ｐの円周方向に回転してキッカー部３０を通過するたびに、歩進ネジ部２０の回転羽根２１の当接部２１ａがキッカー片３１と当接係合して所定量回転し、歩進ネジ部２０の軸部材１７のネジ部１７ａに螺合した支持部材１８に固定に支持された切削バイト１９が単位あたり量ずつ内径方向に移動動作することにより、切削バイト１９の先端刃が既設流体管Ｐの外周壁を一定量ずつ切削しながら外周を回転し、既設流体管Ｐを切断するようになっている（図６及び図７参照）。   Therefore, each time the cutting unit 3 rotates in the circumferential direction of the existing fluid pipe P and passes through the kicker portion 30, the contact portion 21 a of the rotary blade 21 of the stepping screw portion 20 contacts the kicker piece 31. Then, the cutting tool 19 fixedly supported by the support member 18 screwed into the screw portion 17a of the shaft member 17 of the stepping screw portion 20 moves in the inner diameter direction by an amount per unit by rotating a predetermined amount. The tip edge of the cutting tool 19 rotates the outer periphery while cutting the outer peripheral wall of the existing fluid pipe P by a certain amount to cut the existing fluid pipe P (see FIGS. 6 and 7).

また、図８（ｂ）及び図９（ａ）に示されるように、回転羽根２１の当接部２１ａがキッカー片３１との当接係合により所定量回転すると、嵌合部２１ｂも同様に所定量回転し、負荷部材２３は、嵌合部２１ｂが所定量回転した後に対面する嵌合部２１ｂの凹部に嵌合される。つまり、嵌合部２１ｂは、所定量回転した後にバネ体で押圧付勢された負荷部材２３により保持されるため、切削バイト１９は、同様に単位あたり量既設流体管Ｐの内径方向に移動した地点で保持される。   Further, as shown in FIGS. 8B and 9A, when the contact portion 21a of the rotary blade 21 is rotated by a predetermined amount due to the contact engagement with the kicker piece 31, the fitting portion 21b is also the same. The load member 23 is rotated by a predetermined amount, and the load member 23 is fitted into the concave portion of the fitting portion 21b that faces after the fitting portion 21b rotates by a predetermined amount. That is, since the fitting portion 21b is held by the load member 23 that is pressed and urged by the spring body after rotating by a predetermined amount, the cutting tool 19 is similarly moved in the inner diameter direction of the existing fluid pipe P per unit. Held at a point.

したがって、既設流体管Ｐの切断時において、切削バイト１９が既設流体管Ｐの外壁との摺接により後戻り方向に係る力を、負荷部材２３と嵌合部２１ｂの凹部との嵌合により受け止めることができるため、回転羽根２１が逆回転することなく、切削バイト１９の切削位置を保持することが可能となる。   Therefore, when cutting the existing fluid pipe P, the cutting tool 19 receives the force in the backward direction by sliding contact with the outer wall of the existing fluid pipe P by fitting the load member 23 and the recess of the fitting portion 21b. Therefore, the cutting position of the cutting tool 19 can be held without the rotating blade 21 rotating in the reverse direction.

また当然であるが、嵌合部２１ｂに形成される凹部と、当接部２１ａとは、同一の所定角度間隔で設けられているため、既設流体管Ｐの切断時において、当接部２１ａがキッカー片３１により所定量回転した地点で、負荷部材２３は、その対面した前記凹部に嵌合されるため、前記所定量回転により付与された単位あたり量移動した地点において、確実に切削バイト１９が保持される。   As a matter of course, since the concave portion formed in the fitting portion 21b and the contact portion 21a are provided at the same predetermined angular interval, the contact portion 21a is not cut when the existing fluid pipe P is cut. Since the load member 23 is fitted into the facing concave portion at a point rotated by a predetermined amount by the kicker piece 31, the cutting tool 19 is surely moved at a point moved by an amount per unit given by the predetermined amount rotation. Retained.

図６及び図７に示されるように、取付部材２９は、図７左右側にそれぞれ配設され、主に、上ガイド４ａと下ガイド４ｂとに架けて取付けられる背面部２９ｄと、背面部２９ｄの正面側に延びる延設部２９ｅと、内側面に溝部２９ｃが形成される凹状部２９ａと、凹状部２９ａの図６左右側に配置され、背面部２９ｄの下部及び延設部２９ｅの下部に取付けられて配置部５６（図９参照）に支持される底面部２９ｂと、を有しており、溝部２９ｃが、作業筒１１の案内部１３を嵌合し、管切断装置１が該案内部１３により案内される（図９参照）。   As shown in FIGS. 6 and 7, the attachment members 29 are arranged on the left and right sides of FIG. 7, respectively, and mainly a back surface portion 29d attached to the upper guide 4a and the lower guide 4b, and a back surface portion 29d. Are disposed on the left and right sides of FIG. 6 of the concave portion 29a, and are provided below the back portion 29d and the lower portion of the extended portion 29e. A bottom surface portion 29b that is attached and supported by the arrangement portion 56 (see FIG. 9). The groove portion 29c fits the guide portion 13 of the work cylinder 11, and the tube cutting device 1 is connected to the guide portion. 13 (see FIG. 9).

次に、管切断装置１の配置工程について説明すると、先ず、切断ユニット３が固着配設された上部スプロケット９ａを、ガイド部４の上ガイド４ａに取付けるとともに、切断ユニット３が固着配設された下部スプロケット９ｂを、ガイド部４の下ガイド４ｂに取付ける。そして、固定部２７を、上ガイド４ａに対しネジ１３０により固定に取付ける（図６及び図７参照）。   Next, the arrangement process of the tube cutting device 1 will be described. First, the upper sprocket 9a to which the cutting unit 3 is fixedly disposed is attached to the upper guide 4a of the guide portion 4, and the cutting unit 3 is firmly disposed. The lower sprocket 9 b is attached to the lower guide 4 b of the guide portion 4. And the fixing | fixed part 27 is fixed to the upper guide 4a with the screw | thread 130 (refer FIG.6 and FIG.7).

次いで、図４に示されるように、駆動伝達部５と、ガイド部４の上ガイド４ａと、を下ガイド４ｂに取付け、かつ上ガイド４ａ及び下ガイド４ｂに設けられたボルト２８（図６参照）を螺入してガイド部４を既設流体管Ｐに固定する。そして、調整部２６を、キッカー片３１を当接位置に調整した位置で固定部２７に対して固定する調整工程を行う（図９（ａ）、（ｂ）参照）。   Next, as shown in FIG. 4, the drive transmission portion 5 and the upper guide 4a of the guide portion 4 are attached to the lower guide 4b, and the bolts 28 (see FIG. 6) provided on the upper guide 4a and the lower guide 4b. ) To fix the guide portion 4 to the existing fluid pipe P. And the adjustment process which fixes the adjustment part 26 with respect to the fixing | fixed part 27 in the position which adjusted the kicker piece 31 to the contact position is performed (refer Fig.9 (a), (b)).

調整工程について具体的に説明すると、操作部２５を操作することで、カム部材１２３の長径部１２３ｂをキッカー片３１と当接させ、このキッカー片３１と歩進ネジ部２０の当接部２１ａとの相対位置を視認する。キッカー片３１と歩進ネジ部２０の当接部２１ａとが当接しない場合や、キッカー片３１と歩進ネジ部２０の当接部２１ａとが所定の当接状態で当接しない場合には、ボルト１２２を移動部材１２１に遊結した状態で調整部２６を固定部２７に対して移動し、キッカー片３１の位置を適宜変えて、歩進ネジ部２０の当接部２１ａに対する当接量を調整し、キッカー片３１が歩進ネジ部２０の当接部２１ａと所定に当接する当接状態に調整した位置でボルト１２２を堅結し、移動部材１２１を固定部２７に対して固定する（図９（ａ）、（ｂ）参照）。   The adjustment process will be specifically described. By operating the operation portion 25, the long diameter portion 123b of the cam member 123 is brought into contact with the kicker piece 31, and the kicker piece 31 and the contact portion 21a of the stepping screw portion 20 are brought into contact with each other. The relative position of is visually recognized. When the kicker piece 31 and the contact part 21a of the stepping screw part 20 do not contact each other, or when the kicker piece 31 and the contact part 21a of the stepping screw part 20 do not contact in a predetermined contact state In the state where the bolt 122 is loosely connected to the moving member 121, the adjustment portion 26 is moved with respect to the fixed portion 27, the position of the kicker piece 31 is changed as appropriate, and the contact amount of the step screw portion 20 with respect to the contact portion 21 a , And the bolt 122 is firmly fastened at the position where the kicker piece 31 is adjusted to a contact state where the kicker piece 31 contacts the contact part 21a of the stepping screw part 20 in a predetermined manner, and the moving member 121 is fixed to the fixed part 27. (See FIGS. 9A and 9B).

調整工程の終了後、操作部２５を操作することで、キッカー片３１を退避位置に移動させておく。次いで、無端チェーン１０を、従動スプロケット９と駆動スプロケット８とに巻回し、駆動軸７’に図示しないモータ台を接続して、このモータ台に駆動モータ６（図５参照）を取付ける。そして、該駆動モータ６を作動させて無負荷状態で切断ユニット３を既設流体管Ｐの円周方向に試回転させ、無端チェーン１０の張り等に異常がないかを確認する（図６参照）。   After the adjustment process, the operation unit 25 is operated to move the kicker piece 31 to the retracted position. Next, the endless chain 10 is wound around the driven sprocket 9 and the drive sprocket 8, a motor base (not shown) is connected to the drive shaft 7 ', and the drive motor 6 (see FIG. 5) is attached to the motor base. Then, the drive motor 6 is operated to make a trial rotation of the cutting unit 3 in the circumferential direction of the existing fluid pipe P in an unloaded state to check whether there is any abnormality in the tension of the endless chain 10 (see FIG. 6). .

切断ユニット３の試回転後、前記モータ台及び前記駆動モータ６を取外す。そして、既設流体管Ｐの図示上側を囲繞するように筐体２の上部ケース２ｄを下部ケース２ｅの上部に取付け、両ケース２ｄ，２ｅを既設流体管Ｐに固定する。そして、前述したパッキン６９，６９と、押輪Ｑ，Ｑと、ゴム輪６８，６８を上部ケース２ｄ及び下部ケース２ｅの側方開口部に夫々取付け、側方開口部を密封する（図４参照）。図５に示されるように、前述と同様に、図示上側の移動割継輪Ｒの取付座Ｒｃに移動部材６４を取付ける。   After the trial rotation of the cutting unit 3, the motor base and the drive motor 6 are removed. Then, the upper case 2d of the housing 2 is attached to the upper part of the lower case 2e so as to surround the upper side of the existing fluid pipe P in the figure, and both cases 2d and 2e are fixed to the existing fluid pipe P. The packings 69 and 69, the push wheels Q and Q, and the rubber wheels 68 and 68 are attached to the side openings of the upper case 2d and the lower case 2e, respectively, and the side openings are sealed (see FIG. 4). . As shown in FIG. 5, the moving member 64 is attached to the mounting seat Rc of the moving split wheel R on the upper side in the same manner as described above.

次いで、開閉弁２ａを上部ケース２ｄの上部に取付ける。そして、筐体２内、すなわち上部ケース２ｄ、下部ケース２ｅ、及び開閉弁２ａ内に水を張り所定の水圧をかけ、筐体２内の水圧テストを行う。水圧テストの後、筐体２内の水を排水し、開閉弁２ａの上部に作業筒１１を取付け、更に作業筒１１の上部に蓋部１２を取付ける。   Next, the on-off valve 2a is attached to the upper part of the upper case 2d. Then, water is applied to the inside of the housing 2, that is, the upper case 2d, the lower case 2e, and the on-off valve 2a, and a predetermined water pressure is applied, and a water pressure test inside the housing 2 is performed. After the water pressure test, the water in the housing 2 is drained, the work cylinder 11 is attached to the upper part of the on-off valve 2 a, and the lid 12 is attached to the upper part of the work cylinder 11.

そして、伸縮継手部１０７を、切除部Ｋに配置された管切断装置１の駆動軸７’と、挿通孔１２ａに挿通された駆動長軸１０６の他端側と、の間において接続する。   Then, the expansion joint 107 is connected between the drive shaft 7 ′ of the tube cutting device 1 disposed in the cutting portion K and the other end side of the drive long shaft 106 inserted through the insertion hole 12 a.

具体的には、先ず、管切断装置１の駆動軸７’に伸縮継手部１０７を取付け、モータ台１０８が嵌挿された駆動長軸１０６を、密封材１１２及び挿通孔１２ａに挿通する。この状態において、駆動長軸１０６の一端側が作業筒１１の外方に延びて露出している。そして、ボルト９９及びナット９８（図１１参照）により、伸縮継手部１０７と駆動長軸１０６とを接続する。   Specifically, first, the expansion joint 107 is attached to the drive shaft 7 ′ of the tube cutting device 1, and the drive long shaft 106 into which the motor base 108 is inserted is inserted into the sealing material 112 and the insertion hole 12 a. In this state, one end side of the drive long shaft 106 extends outward from the work cylinder 11 and is exposed. And the expansion joint part 107 and the drive long shaft 106 are connected by the volt | bolt 99 and the nut 98 (refer FIG. 11).

次いで、懸吊手段１０２により懸吊された駆動モータ６をモータ台１０８に連結する。この連結において、駆動モータ６の軸部６ｂを駆動長軸１０６の嵌合部１０６ｂに嵌挿することで、軸部６ｂの図示上方に形成された載置部６ａの下面と、モータ台１０８の図示上面と、が当接し、駆動モータ６が安定化して駆動長軸１０６に取付けられる。   Next, the drive motor 6 suspended by the suspension means 102 is connected to the motor base 108. In this connection, the shaft portion 6b of the drive motor 6 is inserted into the fitting portion 106b of the drive long shaft 106, whereby the lower surface of the mounting portion 6a formed above the shaft portion 6b and the motor base 108 are connected. The upper surface in the drawing is in contact with the drive motor 6, and the drive motor 6 is stabilized and attached to the drive long shaft 106.

次いで、管切断工程について説明すると、図５の状態から前述のように駆動長軸１０６に駆動モータ６を取付け、駆動モータ６を作動させて駆動長軸１０６を介し回転駆動力を伸縮継手部１０７に伝達する。この伝達により、切断ユニット３が回転し、切断ユニット３が既設流体管Ｐの円周方向に回転してキッカー部３０を通過するたびに、歩進ネジ部２０がキッカー片３１と当接係合して所定量、すなわち所定角度回転し、図９（ａ）の状態から、切削バイト１９の切削部１９ａが防護部材１６の当接部１６ｂと当接して、支持部材１８及び切削バイト１９が単位あたり量ずつ内径方向に歩進する。これら支持部材１８及び切削バイト１９の歩進により、切削バイト１９の先端刃が既設流体管Ｐの外周壁と当接し、既設流体管Ｐが一定量ずつ切削される。   Next, the tube cutting process will be described. From the state of FIG. 5, the drive motor 6 is attached to the drive long shaft 106 as described above, and the drive motor 6 is operated so that the rotational drive force is supplied to the expansion joint portion 107 via the drive long shaft 106. To communicate. By this transmission, the cutting unit 3 rotates, and the cutting screw unit 20 contacts the kicker piece 31 each time the cutting unit 3 rotates in the circumferential direction of the existing fluid pipe P and passes through the kicker unit 30. 9a, the cutting part 19a of the cutting tool 19 comes into contact with the contact part 16b of the protection member 16, and the support member 18 and the cutting tool 19 are unit. Step by step in the inner diameter direction. As the support member 18 and the cutting tool 19 are stepped, the leading edge of the cutting tool 19 comes into contact with the outer peripheral wall of the existing fluid pipe P, and the existing fluid pipe P is cut by a certain amount.

この切削により、既設流体管Ｐから切り粉が排出されることになるが、防護部材１６は、ベース部材１４の開口Ｕを覆うように、ベース部材１４に取付けられているため、防護部材１６により切り粉がベース部材１４の開口Ｕから歩進ネジ部２０に進入することがない。また、既設流体管Ｐから排出された切り粉が飛散しても、歩進ネジ部２０を外周方向に沿って覆われたベース部材１４により、該切り粉が歩進ネジ部２０の周りに付着することを防止することができる。   By this cutting, swarf is discharged from the existing fluid pipe P. However, since the protection member 16 is attached to the base member 14 so as to cover the opening U of the base member 14, the protection member 16 The swarf does not enter the stepping screw portion 20 from the opening U of the base member 14. Further, even when the chips discharged from the existing fluid pipe P are scattered, the chips adhere around the stepping screw part 20 by the base member 14 covering the stepping screw part 20 along the outer peripheral direction. Can be prevented.

また、防護部材１６の当接部１６ｂが内径方向に歩進する切削部１９ａと当接することで、切り粉が切削部１９ａと防護部材１６との間から進入することを確実に防止し、切り粉の歩進ネジ部２０への進入による、歩進ネジ部２０と該歩進ネジ部２０に螺合した支持部材１８との作動不良を効果的に防止することができる。更に防護部材１６により、切り粉のベース部材１４内部への進入、特にベース部材１４と、支持部材１８若しくは切削バイト１９との隙間部への進入を防止できる。   Further, the contact portion 16b of the protection member 16 contacts the cutting portion 19a that advances in the inner diameter direction, thereby reliably preventing chips from entering between the cutting portion 19a and the protection member 16. It is possible to effectively prevent malfunction of the stepping screw portion 20 and the support member 18 screwed into the stepping screw portion 20 due to the powder entering the stepping screw portion 20. Furthermore, the protective member 16 can prevent chips from entering the base member 14, particularly the gap between the base member 14 and the support member 18 or the cutting tool 19.

更に、切削バイト１９が内径方向に歩進することで、図１０（ａ）に示されるように、取付部１９ｂのテーパ面１９ｃが防護部材１６の当接部１６ｂと一部当接し、この当接により、当接部１６ｂが本体部１６ａに対して屈曲した状態で切削バイト１９が既設流体管Ｐを切削する。続けて切削バイト１９が内径方向に歩進し、図１０（ｂ）に示されるように、当接部１６ｂがテーパ面１９ｃに略全面に亘って当接して屈曲した状態で、既設流体管Ｐを更に切削する。やがて、切除部Ｋにおいて、２箇所の切断面で既設流体管Ｐが切断され、すなわち切断面間の図示しない管片が既設流体管Ｐから分断されることになる。   Further, as the cutting tool 19 advances in the inner diameter direction, as shown in FIG. 10A, the tapered surface 19c of the mounting portion 19b partially contacts the contact portion 16b of the protective member 16, and this contact is achieved. Due to the contact, the cutting tool 19 cuts the existing fluid pipe P in a state where the contact portion 16b is bent with respect to the main body portion 16a. Subsequently, the cutting tool 19 advances in the inner diameter direction, and as shown in FIG. 10 (b), the existing fluid pipe P is in a state where the contact portion 16b is in contact with the taper surface 19c and bent over substantially the entire surface. Is further cut. Eventually, in the excision part K, the existing fluid pipe P is cut at two cut surfaces, that is, a pipe piece (not shown) between the cut surfaces is cut off from the existing fluid pipe P.

このように、管切断工程において、防護部材１６の当接部１６ｂのみが本体部１６ａに対して屈曲するため、切り粉の歩進ネジ部２０への進入防止を維持しながら、切削バイト１９の内径方向の所定の歩進量を確保できる。また、取付部１９ｂにテーパ面１９ｃが形成されていることで、テーパ面１９ｃが防護部材１６の当接部１６ｂに対して面接触、すなわち略全面に亘って当接するため、テーパ面１９ｃと当接部１６ｂとの間から切り粉が進入することを確実に防止することができる。   In this way, in the tube cutting step, only the contact portion 16b of the protection member 16 is bent with respect to the main body portion 16a, so that the cutting bit 19 is maintained while preventing the chips from entering the stepping screw portion 20. A predetermined amount of stepping in the inner diameter direction can be ensured. In addition, since the taper surface 19c is formed on the mounting portion 19b, the taper surface 19c comes into surface contact with the contact portion 16b of the protection member 16, that is, substantially contacts the entire surface. It is possible to reliably prevent chips from entering between the contact portion 16b.

既設流体管Ｐの切断が終了した後に、管切断装置１を管片とともに引上げる。先ずモータ台１０８に連結された駆動モータ６を外した後に、管切断装置１と下部ケース２ｅとの固定を解除し、ガイド部４（図６参照）に取付けられた取付部材２９が仮受台５５の配置部５６よりも高い位置になるまで管切断装置１を引上げる（図１１参照）。   After the cutting of the existing fluid pipe P is completed, the pipe cutting device 1 is pulled up together with the pipe piece. First, after the drive motor 6 connected to the motor base 108 is removed, the fixing of the tube cutting device 1 and the lower case 2e is released, and the attachment member 29 attached to the guide portion 4 (see FIG. 6) is a temporary support base. The tube cutting device 1 is pulled up to a position higher than the arrangement portion 56 of 55 (see FIG. 11).

具体的には、図１１に示されるように、既設流体管Ｐの切断が終了した後に管切断装置１を引上げる際において、配置部５６は、取付部５７に収容されている位置、すなわち管切断装置１との移動による干渉を回避する回避位置に配置されており、既設流体管Ｐの切断が終了した後に懸吊手段１０２により駆動長軸１０６を介して管切断装置１を懸吊することで、取付部材２９，２９の溝部２９ｃ，２９ｃに案内部１３，１３が嵌合され、すなわち管切断装置１が案内部１３，１３により案内され、取付部材２９が仮受台５５，５５の配置部５６，５６よりも若干高い位置になるまで管切断装置１を引上げる。   Specifically, as shown in FIG. 11, when the pipe cutting device 1 is pulled up after the cutting of the existing fluid pipe P is finished, the arrangement part 56 is located at the position accommodated in the attachment part 57, that is, the pipe The tube cutting device 1 is arranged at an avoidance position for avoiding interference due to movement with the cutting device 1, and the tube cutting device 1 is suspended by the suspension means 102 via the drive long shaft 106 after the cutting of the existing fluid pipe P is completed. Thus, the guide portions 13 and 13 are fitted in the groove portions 29c and 29c of the attachment members 29 and 29, that is, the tube cutting device 1 is guided by the guide portions 13 and 13, and the attachment member 29 is disposed in the temporary receiving bases 55 and 55. The tube cutting device 1 is pulled up to a position slightly higher than the portions 56 and 56.

次いで、図１２に示されるように、仮受台５５，５５の操作部５８，５８を操作することで配置部５６，５６を、作業筒１１の内方に向かって、管切断装置１を配置する配置位置に移動させる。   Next, as shown in FIG. 12, the pipe cutting device 1 is placed toward the inside of the work cylinder 11 by placing the placement parts 56, 56 by operating the operation parts 58, 58 of the temporary holders 55, 55. Move to the placement position.

そして、引上げた管切断装置１を、案内部１３，１３により案内して下降させ、この配置部５６，５６の平坦面５６ｄ，５６ｄに取付部材２９，２９の底面部２９ｂ，２９ｂを載置することにより、管切断装置１を配置部５６，５６に配置する。つまり、取付部材２９，２９の底面部２９ｂ，２９ｂが、配置部５６，５６の平坦面５６ｄ，５６ｄに係合することにより、管切断装置１が仮受台５５，５５に仮置される。そして、開閉弁２ａを閉状態にする。   Then, the pulled pipe cutting device 1 is guided and lowered by the guide portions 13 and 13, and the bottom surface portions 29b and 29b of the mounting members 29 and 29 are placed on the flat surfaces 56d and 56d of the placement portions 56 and 56, respectively. As a result, the pipe cutting device 1 is placed in the placement portions 56 and 56. That is, the tube cutting device 1 is temporarily placed on the temporary holders 55 and 55 by engaging the bottom surfaces 29 b and 29 b of the attachment members 29 and 29 with the flat surfaces 56 d and 56 d of the placement portions 56 and 56. Then, the on-off valve 2a is closed.

尚、管切断装置１を引上げるまでは開閉弁２ａを開状態にしているため、上水により作業筒１１内が浸水されており、この閉状態にした後に、作業筒１１に残留する上水を前記排水用コックから排水する。   Since the on-off valve 2a is open until the pipe cutting device 1 is pulled up, the inside of the work cylinder 11 is submerged by the water, and the water remaining in the work cylinder 11 after the closed state is established. Is drained from the drain cock.

前記排水用コックからの排水後、ボルト９９及びナット９８の締結を解除し、駆動長軸１０６を、管切断装置１が配置部５６，５６に配置された状態で、作業筒１１内に収容された管切断装置１と、駆動長軸１０６の他端側と、の間において接続されている伸縮継手部１０７から取外し、駆動長軸１０６と管切断装置１とを、個別に作業筒１１から回収する。   After draining from the drain cock, the fastening of the bolt 99 and the nut 98 is released, and the drive long shaft 106 is accommodated in the work cylinder 11 in a state where the pipe cutting device 1 is disposed in the placement portions 56 and 56. The pipe cutting device 1 and the expansion joint 107 connected between the other end of the drive long shaft 106 are removed, and the drive long shaft 106 and the tube cutting device 1 are individually recovered from the work cylinder 11. To do.

次いで、蓋部１２を作業筒１１から取外し、管切断装置１を引上げることで管切断装置１とともに管片を外方に取出す。そして、作業筒１１を取外し、開閉弁２ａの上部に図示しない吸引具が嵌挿されたスイーパ蓋を取付けて、開閉弁２ａを開状態とし、切断部Ｚ，Ｚ（図１１参照）付近に既設流体管Ｐの切断の際に発生した切粉を吸引具から吸引して外部に排出する。切粉の排出後、吸引具を引上げるとともに、開閉弁２ａを閉状態として前記スイーパ蓋を開閉弁２ａから取外し、開閉弁２ａの上部に作業筒１１を取付ける。   Next, the lid 12 is removed from the work cylinder 11, and the tube cutting device 1 is pulled up to take out the tube piece together with the tube cutting device 1. Then, the work cylinder 11 is removed, and a sweeper lid in which a suction tool (not shown) is inserted is attached to the upper part of the on-off valve 2a, the on-off valve 2a is opened, and is already installed near the cutting portions Z and Z (see FIG. 11). Chips generated when the fluid pipe P is cut are sucked from the suction tool and discharged to the outside. After discharging the chips, the suction tool is pulled up, the open / close valve 2a is closed, the sweeper lid is removed from the open / close valve 2a, and the work cylinder 11 is attached to the upper part of the open / close valve 2a.

この作業筒１１の取付け後、制水弁４２を切除部Ｋに配置する制水体設置工程を行う。ここで、制水弁４２の構造について説明すると、図１３に示されるように、制水弁４２は、内部に弁体４３を備えた弁筐体４２ａ、及び該弁体４３に接続され弁筐体４２ａの外方に突出した弁軸部４３ｂを有しており、開閉弁２ａを介して筐体２内に挿入され、切除部Ｋに配置される。   After the work cylinder 11 is attached, a water control body installation process is performed in which the water control valve 42 is disposed in the excision K. Here, the structure of the water control valve 42 will be described. As shown in FIG. 13, the water control valve 42 includes a valve housing 42 a having a valve body 43 therein, and a valve housing connected to the valve body 43. It has a valve shaft portion 43b that protrudes outward from the body 42a, is inserted into the housing 2 via the on-off valve 2a, and is disposed in the excision portion K.

具体的には、制水弁４２は、緊急時に弁体４３の回動で管路を遮断可能であって、制水弁４２の両端部４３ｃ，４３ｄには、移動割継輪Ｒ，Ｒと接続するための接続フランジ部４１，４１が形成されている。   Specifically, the water control valve 42 can shut off the pipe line by turning the valve body 43 in an emergency, and both end portions 43c and 43d of the water control valve 42 are connected to the moving split wheels R and R. Connection flange portions 41 and 41 for connection are formed.

更に、制水弁４２の図示中央部には、着脱可能に支持部材Ｔ，Ｔが取付けられており、この支持部材Ｔ，Ｔに、支持ユニット１０３，１０３が取付けられた前述の取付部材２９，２９が着脱可能に設けられている。尚、支持ユニット１０３は、内側面に溝部が形成される凹状部を有しており、該溝部が取付部材２９の溝部と連通し、これら溝部が作業筒１１の前記案内部を嵌合し、制水弁４２が該案内部により案内されるようになっている。   Furthermore, support members T, T are detachably attached to the illustrated central portion of the water control valve 42, and the above-described attachment members 29, 103, to which the support units 103, 103 are attached, are attached to the support members T, T. 29 is detachably provided. The support unit 103 has a concave portion in which a groove portion is formed on the inner side surface, the groove portion communicates with the groove portion of the attachment member 29, and these groove portions fit the guide portion of the work cylinder 11, The water control valve 42 is guided by the guide portion.

次に、図１３において、先ず、前記仮受台の前記操作部を操作することで配置部を、配置位置に移動させる。   Next, in FIG. 13, first, the placement unit is moved to the placement position by operating the operation unit of the provisional cradle.

そして、制水弁４２を、前記案内部により案内して下降させ、前記配置部の平坦面に支持ユニット１０３，１０３の底面部を載置することにより、制水弁４２を前記配置部に配置することで、制水弁４２が前記仮受台に仮置される。   Then, the water control valve 42 is guided and lowered by the guide portion, and the bottom surface portion of the support units 103 and 103 is placed on the flat surface of the placement portion, whereby the water control valve 42 is placed on the placement portion. As a result, the water control valve 42 is temporarily placed on the temporary support base.

次いで、図１３に示されるように、弁軸部４３ｂの図示上部に、連結具４２ｂを設け、この連結具４２ｂにボルト・ナットＶにて作業筒１１外方まで延びた挿入ロッド１０９を取外し可能に連結する。   Next, as shown in FIG. 13, a connecting tool 42b is provided at the upper part of the valve shaft 43b, and the insertion rod 109 extending to the outside of the working cylinder 11 can be removed from the connecting tool 42b with bolts and nuts V. Connect to

そして、懸吊手段１０２にて制水弁４２を懸吊した状態で、前記仮受台の操作部を操作することで内方に移動した前記配置部を回避位置に移動する（図１２参照）。そして、図１４に示されるように、開閉弁２ａを開状態にし、制水弁４２を下降して既設流体管Ｐの管軸と略同軸の位置に配置する。   And in the state which suspended the water control valve 42 with the suspension means 102, the said arrangement | positioning part which moved to the inside by operating the operation part of the said temporary support stand is moved to an avoidance position (refer FIG. 12). . Then, as shown in FIG. 14, the on-off valve 2 a is opened, and the water control valve 42 is lowered and disposed at a position substantially coaxial with the pipe axis of the existing fluid pipe P.

制水弁４２を下降した後に、制水弁４２の端部４２ｃ，４２ｄ及び既設流体管Ｐの切断部Ｚ，Ｚに移動割継輪Ｒ，Ｒを架設する継輪架設工程を行う。作動油を供給する油圧ユニット６３と油圧ジャッキ６５のシリンダ６５ｂ間に油圧ホースＨを連結し、油圧ユニット６３を操作して、作動油をシリンダ６５ｂ内に供給することで、移動割継輪Ｒ，Ｒを、移動割継輪Ｒ，ＲのフランジＲｂ，Ｒｂが制水弁４２の接続フランジ部４１，４１と当接するまで切除部Ｋに向かって（図示白抜矢印参照）移動させる。これにより、図１５に示されるように、移動割継輪Ｒ，Ｒが制水弁４２の端部４２ｃ，４２ｄ及び既設流体管Ｐの切断部Ｚ，Ｚに架設される。   After lowering the water control valve 42, a joint erection process is performed in which the moving split wheels R, R are installed at the ends 42 c, 42 d of the water control valve 42 and the cutting parts Z, Z of the existing fluid pipe P. A hydraulic hose H is connected between the hydraulic unit 63 for supplying hydraulic oil and the cylinder 65b of the hydraulic jack 65, and the hydraulic unit 63 is operated to supply hydraulic oil into the cylinder 65b. R is moved toward the cut portion K (see the white arrow in the figure) until the flanges Rb, Rb of the moving split wheels R, R come into contact with the connection flange portions 41, 41 of the water control valve 42. As a result, as shown in FIG. 15, the moving split wheels R, R are installed on the end portions 42 c, 42 d of the water control valve 42 and the cut portions Z, Z of the existing fluid pipe P.

継輪架設工程が終了した後に、筐体２内、すなわち上部ケース２ｄ、下部ケース２ｅ、及び開閉弁２ａ内の水を排水する。そして、ボルト・ナットＶを取外すことで挿入ロッド１０９を、連結具４２ｂとの連結を解除して筐体２の外部に懸吊手段１０２にて引抜き、蓋部１２、作業筒１１、及び開閉弁２ａを取外す。そして、移動割継輪Ｒ，ＲのフランジＲｂ，Ｒｂと制水弁４２の接続フランジ部４１，４１とを夫々図示しないボルトにより締結し、上部ケース２ｄ、上部ケース２ｄ側に設けられた取付座Ｒｃ、上部ケース２ｄに設けられた油圧移動手段を構成する部材等の各種部材を取外す。   After the connection erection process is completed, the water in the housing 2, that is, the upper case 2d, the lower case 2e, and the on-off valve 2a is drained. Then, by removing the bolts and nuts V, the insertion rod 109 is released from the connection tool 42b and pulled out of the housing 2 by the suspension means 102, and the lid portion 12, the work cylinder 11, and the on-off valve Remove 2a. Then, the flanges Rb, Rb of the movable split wheels R, R and the connection flange portions 41, 41 of the water control valve 42 are fastened by bolts (not shown), respectively, and the mounting seats provided on the upper case 2d and the upper case 2d side. Rc, various members such as members constituting the hydraulic movement means provided in the upper case 2d are removed.

各種部材を取外した後に、下部ケース２ｅを取外すために、図１６に示されるように、固定部材１０１，１０１の上端に設けられた夫々の支持台１０４，１０４に架設部材１０５を架設するとともに、架設部材１０５にチェーンブロック６０を設ける。このチェーンブロック６０のチェーン６０ａを支持部材Ｔの係合箇所に係合することで、切除部Ｋに配置された制水弁４２をチェーンブロック６０により吊持し、下部ケース２ｅを取外すことができるようになっている。   After removing the various members, in order to remove the lower case 2e, as shown in FIG. 16, the erection member 105 is constructed on the respective support bases 104, 104 provided at the upper ends of the fixing members 101, 101, and A chain block 60 is provided on the erection member 105. By engaging the chain 60a of the chain block 60 with the engaging portion of the support member T, the water control valve 42 disposed in the cut portion K can be suspended by the chain block 60 and the lower case 2e can be removed. It is like that.

下部ケース２ｅを取外した後に、支持部材Ｔを制水弁４２から取外し、制水弁４２を回動させる制水体回動工程を行うために、図１７（ａ）に示されるように、制水弁４２を既設流体管Ｐの周方向に回動可能に支持する回動支持部７６を接続フランジ部４１と当接するようにその下方に載置する。   After removing the lower case 2e, in order to remove the support member T from the water control valve 42 and perform the water control body rotating step of rotating the water control valve 42, as shown in FIG. A rotation support portion 76 that supports the valve 42 so as to be rotatable in the circumferential direction of the existing fluid pipe P is placed below the connection flange portion 41 so as to come into contact therewith.

ここで、回動支持部７６の構造について説明すると、回動支持部７６は、前述したジャッキ７５と、既設流体管Ｐの周方向に回動可能に支持するローラ１１１ｂ，１１１ｂを有する支持ユニット１１１と、から成っている。   Here, the structure of the rotation support portion 76 will be described. The rotation support portion 76 includes the jack 75 described above and the rollers 111b and 111b that are rotatably supported in the circumferential direction of the existing fluid pipe P. And consists of:

そして、回動支持部７６を配置した後に、制水弁回動手段７１を設置し、移動割継輪Ｒを介して既設流体管Ｐに接続された制水弁４２を、弁軸部４３ｂが水平方向を向く設置位置に向けて既設流体管Ｐの周方向に回動させる制水弁回動手段７１を用いて制水体回動工程を行う（図１７（ｂ）参照）。   Then, after the rotation support portion 76 is disposed, the water control valve rotation means 71 is installed, and the valve shaft portion 43b is connected to the existing fluid pipe P via the moving splice wheel R. The water control body rotating step is performed using the water control valve rotating means 71 that rotates in the circumferential direction of the existing fluid pipe P toward the horizontal installation position (see FIG. 17B).

ここで、制水弁回動手段７１の構造について説明すると、図１７（ａ）、（ｂ）に示されるように、制水弁回動手段７１は、既設流体管Ｐに対し固定に取付けられる本体部７２及び架設片７９に架設される付属ユニット７４及び該付属ユニット７４に取付けられる略対称の２分割構造の分割部材７３，７３と、ボルト６１及びナット６２により移動割継輪Ｒに着脱可能に架設され、制水弁４２とともに周方向に回動する架設片７９と、から成る。   Here, the structure of the water control valve rotating means 71 will be described. As shown in FIGS. 17A and 17B, the water control valve rotating means 71 is fixedly attached to the existing fluid pipe P. Attachment unit 74 installed on main body 72 and installation piece 79, split members 73, 73 having a substantially symmetrical two-part structure attached to attachment unit 74, bolt 61 and nut 62 can be attached to and detached from moving split ring R. And a construction piece 79 that rotates together with the water control valve 42 in the circumferential direction.

付属ユニット７４，７４は、架設片７９と係合する図示しない進退部と、該進退部に螺合し、前記進退部を進退する駆動する駆動部７８と、を有しており、駆動部７８を回動操作して、前記進退部を駆動部７８の軸方向に移動することで、前記進退部に係合された架設片７９が、移動割継輪Ｒとともに所定角度（本実施例では３０°）周方向に回動する操作が可能になっている。   The attached units 74, 74 have an advancing / retreating portion (not shown) that engages with the installation piece 79, and a driving portion 78 that is screwed to the advancing / retreating portion to drive the advancing / retreating portion. Is rotated to move the advancing / retracting portion in the axial direction of the drive portion 78, so that the installation piece 79 engaged with the advancing / retreating portion is moved together with the moving split wheel R at a predetermined angle (30 in this embodiment). °) Operation to rotate in the circumferential direction is possible.

そして、この操作を繰り返すことで、図１７（ｂ）に示されるように、制水弁４２が図１７（ａ）の状態から９０°回動し、制水弁４２が、弁軸部４３ｂが水平方向を向く設置位置に設置される。   Then, by repeating this operation, as shown in FIG. 17 (b), the water control valve 42 is rotated 90 ° from the state of FIG. 17 (a), and the water control valve 42 is connected to the valve shaft portion 43b. Installed in the horizontal position.

図１７（ｂ）において、制水体回動工程を行うことにより、制水弁４２は、図示左右水平方向の弁体４３の弁軸部４３ｂ回りに回動し管路を開閉可能な弁体４３が略水平方向を向いた開状態で配置され、通常は既設流体管Ｐ内を流体が流通可能となる。   In FIG. 17 (b), by performing the water control body rotating step, the water control valve 42 rotates about the valve shaft portion 43b of the valve body 43 in the horizontal direction shown in the figure and can open and close the pipe line 43. Are arranged in an open state facing substantially the horizontal direction, and fluid can normally flow through the existing fluid pipe P.

制水体回動工程が終了した後に、制水弁回動手段７１を構成する部材及び回動支持部７６を取外し、図１８（ａ）、（ｂ）に示されるように、移動割継輪Ｒ，ＲのフランジＲｂ，Ｒｂと、制水弁４２の接続フランジ部４１，４１と、の結合状態を確認するとともに、移動割継輪Ｒ，Ｒの内周に図示しないシール材を嵌挿するとともに、フランジＲｄ，Ｒｄと、押輪のフランジを結合し、更に固定リングＳ，Ｓを取付ける。そして、制水弁４２を支持する支持台５２を制水弁４２の下方に複数設ける。   After the water control body rotation process is completed, the members constituting the water control valve rotation means 71 and the rotation support portion 76 are removed, and as shown in FIGS. , R flanges Rb, Rb and the connection flange portions 41, 41 of the water control valve 42 are connected, and a sealing material (not shown) is inserted into the inner periphery of the moving splice wheels R, R. The flanges Rd and Rd and the flange of the press ring are coupled, and the fixing rings S and S are further attached. A plurality of support bases 52 that support the water control valve 42 are provided below the water control valve 42.

次いで、遮断装置を構成する各種部材を制水弁４２に取付ける。図１８（ｂ）に示されるように、弁体４３の図示左側において、前述した弁軸部に回動力が伝達可能に遮断装置３４を組み付ける。同様に、弁体４３の図示右側において、前記弁軸部に回動力が伝達可能に遮断手動手段３５に組み付ける。   Next, various members constituting the shut-off device are attached to the water control valve 42. As shown in FIG. 18B, on the left side of the valve body 43 in the figure, the shut-off device 34 is assembled to the above-described valve shaft portion so that the rotational force can be transmitted. Similarly, on the right side of the valve body 43 in the figure, it is assembled to the shut-off manual means 35 so that the rotational force can be transmitted to the valve shaft portion.

図１８（ａ）、（ｂ）に示されるように、遮断装置３４は、後述する荷重体３８、緩衝部３９、ソレノイド４９等の各部材が、基板３６に組み付けられて構成されている。   As shown in FIGS. 18A and 18B, the blocking device 34 is configured by assembling members such as a load body 38, a buffer portion 39, and a solenoid 49, which will be described later, to the substrate 36.

次に、弁体４３の回動動作について説明すると、例えば地震等の非常時など既設流体管Ｐの特定状態において、信号線５０の他端側に設けられた図示しない地震の感知装置からの電気信号が、ソレノイド４９に送られることで、ソレノイドバー４９ａが上方のソレノイド４９本体に向かって移動する。この移動に伴い、保持レバー４８がその一端部周りに上方に回動し、他端部が係止片４７から外れて、荷重体３８が、前記軸部周りに下方に移動しようとする拘束が解かれ、重力落下するので、この荷重体３８の重力落下とともに、回動アーム４４及び前記軸部を介して前記弁軸部を略９０度回動し、すなわち弁体４３が閉塞状態となる。   Next, the rotation operation of the valve body 43 will be described. Electricity from an earthquake sensing device (not shown) provided on the other end side of the signal line 50 in a specific state of the existing fluid pipe P such as an emergency such as an earthquake. By sending a signal to the solenoid 49, the solenoid bar 49a moves toward the upper solenoid 49 body. Along with this movement, the holding lever 48 is rotated upward around one end thereof, the other end is disengaged from the locking piece 47, and the load body 38 is restrained to move downward around the shaft portion. When the load body 38 is dropped by gravity, the valve body is rotated by approximately 90 degrees through the rotating arm 44 and the shaft portion, that is, the valve body 43 is closed.

このように、遮断装置３４の荷重体３８を前記弁軸部の上方に設け、既設流体管Ｐの特定状態において重力落下することで、水平方向の前記弁軸部に直接に駆動力を付与することにより、特段のエネルギを用いずに前記弁軸部の上方に設けられた荷重体３８の位置エネルギを利用して、安価且つ効率よく駆動力を前記弁軸部に付与することができる。   In this way, the load body 38 of the shut-off device 34 is provided above the valve shaft portion, and gravity is dropped in a specific state of the existing fluid pipe P, so that a driving force is directly applied to the valve shaft portion in the horizontal direction. Accordingly, the driving force can be applied to the valve shaft portion at low cost and efficiently by using the potential energy of the load body 38 provided above the valve shaft portion without using special energy.

以上に説明したように、実施例の管切断装置１において、防護部材１６が径方向に進退する取付部１９ｂと当接することで屈曲されるため、防護部材１６が少なくとも切削部１９ａ近傍まで延設して、切削部１９ａと防護部材１６との間に切り粉の進入を防ぐことができ、切り粉の歩進ネジ部２０への進入による歩進ネジ部２０の作動不良を防止することができる。また、防護部材１６の屈曲により、取付部１９ｂが防護部材１６と当接することによる切削バイト１９の歩進不良が起こることなく、切削バイト１９の径方向の歩進量を増加させることができる。   As described above, in the pipe cutting device 1 according to the embodiment, the protection member 16 is bent by coming into contact with the mounting portion 19b that advances and retracts in the radial direction, so that the protection member 16 extends at least to the vicinity of the cutting portion 19a. Thus, it is possible to prevent chips from entering between the cutting portion 19a and the protective member 16, and it is possible to prevent malfunction of the stepping screw portion 20 due to the chips entering the stepping screw portion 20. . Further, the bending amount of the cutting tool 19 can be increased without causing a step failure of the cutting tool 19 due to the attachment portion 19 b coming into contact with the protection member 16 due to the bending of the protection member 16.

以上、本発明の実施例を図面により説明してきたが、具体的な構成はこれら実施例に限られるものではなく、本発明の要旨を逸脱しない範囲における変更や追加があっても本発明に含まれる。   Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

例えば、前記実施例及び変形例では、既設流体管Ｐの内部を流れる流体が上水であるが、流体は必ずしも上水に限らず、例えば工業用水であってもよいし、また気体や気液混合状態の流体が流れる流体管にも適用可能である。   For example, in the above-described embodiments and modifications, the fluid flowing inside the existing fluid pipe P is clean water, but the fluid is not necessarily limited to clean water, and may be industrial water, or may be gas or gas-liquid. The present invention can also be applied to a fluid pipe through which a mixed fluid flows.

また、本実施例では、制水弁４２を、弁体４３の回転で管路を開閉する回転弁として説明しているが、制水体の用途や構成についてはこれに限らず、例えば、弁体の上下動で管路を開閉する仕切弁や、分岐弁・分岐管等の制水体であってもよいし、あるいは流量計や発電機等の設置体であってもよい。   In the present embodiment, the water control valve 42 is described as a rotary valve that opens and closes a pipe line by the rotation of the valve body 43. However, the use and configuration of the water control body are not limited to this, and for example, a valve body It may be a gate valve that opens and closes a pipe line by vertical movement, a water control body such as a branch valve or a branch pipe, or an installation body such as a flow meter or a generator.

また、本実施例では、防護部材１６に切り込みが形成された当接部１６ｂが本体部１６ａに対して屈曲するようになっているが、これに限らず、例えば、特段の加工が行われていない平板状の防護部材が、全体に亘って屈曲してもよい。   In this embodiment, the contact portion 16b in which the protection member 16 is cut is bent with respect to the main body portion 16a. However, the present invention is not limited to this, and for example, special processing is performed. No flat protective member may be bent over the whole.

また、本実施例では、防護部材１６は、弾性材からなる屈曲部材であるが、これに限らず、例えば、防護部材は、当接部と本体部とがヒンジで接続されており、当接部を内方に向かって付勢する付勢部材が当接部と本体部とに架設されたものであってもよい。   In this embodiment, the protection member 16 is a bending member made of an elastic material. However, the present invention is not limited to this, and for example, the protection member has a contact portion and a body portion connected by a hinge, An urging member that urges the portion inwardly may be constructed between the contact portion and the main body portion.

また、本実施例では、防護部材１６は、内径方向に歩進する切削部１９ａと当接するようになっているが、これに限らず、例えば、防護部材は、切削バイトの切削部近傍、すなわち少なくとも取付部１９ｂと当接する位置まで延設されているものであってもよい。   In the present embodiment, the protection member 16 comes into contact with the cutting portion 19a that advances in the inner diameter direction. However, the protection member 16 is not limited to this, and for example, the protection member is in the vicinity of the cutting portion of the cutting tool, that is, It may be extended to at least a position where it comes into contact with the mounting portion 19b.

また、本実施例では、防護部材１６が、ベース部材１４に取付けられ、防護部材１６及びベース部材１４により、切り粉から歩進ネジ部２０を防護しているが、これに限らず、例えば、防護部材は、歩進ネジ部と既設流体管の外周面との間に位置するように、従動スプロケットに取付けられ、防護部材のみにより、歩進ネジ部が切り粉から防護されてもよい。   Further, in this embodiment, the protection member 16 is attached to the base member 14, and the stepping screw portion 20 is protected from the chips by the protection member 16 and the base member 14. However, the present invention is not limited to this. The protection member may be attached to the driven sprocket so as to be positioned between the stepping screw portion and the outer peripheral surface of the existing fluid pipe, and the stepping screw portion may be protected from the chips by the protection member alone.

１ 管切断装置
２ 筐体
２ａ 開閉弁（開口部）
４ ガイド部（本体部）
１４ ベース部材（被覆壁）
１４ａ プレート部材（被覆壁）
１６ 防護部材
１６ａ 本体部
１６ｂ 当接部
２０ 歩進ネジ部
１９ 切削バイト
１９ａ 切削部
１９ｂ 取付部
３０ キッカー部
Ｕ 開口
Ｚ 切断部
Ｐ 既設流体管 DESCRIPTION OF SYMBOLS 1 Pipe cutting device 2 Case 2a On-off valve (opening part)
4 Guide part (main part)
14 Base member (coating wall)
14a Plate member (coating wall)
16 Protective member 16a Main body portion 16b Abutting portion 20 Stepping screw portion 19 Cutting tool 19a Cutting portion 19b Mounting portion 30 Kicker portion U Opening Z Cutting portion P Existing fluid pipe

Claims (3)

分割構造を有するとともに開閉可能な開口部を備え既設流体管を水密に囲繞する筐体内で、既設流体管の所定箇所を切断する管切断装置であって、
前記既設流体管に固定に取付けられる本体部と、前記既設流体管の周方向に回転自在に該本体部に取付けられる切断ユニットと、該切断ユニットの回転経路近傍において前記本体部に固定に取付けられるキッカー部と、を備え、
前記切断ユニットは、前記既設流体管の周壁を前記周方向に沿って切削可能な切削バイトと、前記キッカー部と当接係合して軸回りに回転することで、前記切削バイトを前記既設流体管の径方向に進退させる歩進ネジ部と、を少なくとも有し、
前記切削バイトは、前記歩進ネジ部の外周部に連結する取付部と、前記既設流体管側に延び、該取付部よりも外方に位置し、前記既設流体管を切削する切削部と、を備え、
前記切断ユニットに、前記歩進ネジ部と前記既設流体管の外周面との間に配置され、前記既設流体管から排出される切り粉の前記歩進ネジ部への進入を防ぐ防護部材が設けられており、
前記防護部材は、少なくとも前記切削バイトの切削部近傍まで延設され、前記切断ユニットに固定された本体部と前記径方向に歩進する前記切削バイトの取付部と当接することで屈曲される当接部とを有し、前記切削バイトが内径方向に歩進することで前記当接部が前記取付部に形成されたテーパ面に面接触することを特徴とする管切断装置。 A pipe cutting device that has a split structure and has an opening that can be opened and closed, and that cuts a predetermined portion of the existing fluid pipe in a casing that watertightly surrounds the existing fluid pipe,
A main body fixedly attached to the existing fluid pipe, a cutting unit attached to the main body so as to be rotatable in a circumferential direction of the existing fluid pipe, and fixedly attached to the main body near the rotation path of the cutting unit A kicker section, and
The cutting unit comprises a cutting tool capable of cutting a peripheral wall of the existing fluid pipe along the circumferential direction, and abutting engagement with the kicker portion, and rotating about the axis to thereby remove the cutting tool. A stepping screw part that advances and retracts in the radial direction of the tube, and
The cutting tool includes an attachment portion connected to an outer peripheral portion of the stepping screw portion, a cutting portion that extends to the existing fluid pipe side, is located outside the attachment portion, and cuts the existing fluid pipe; With
The cutting unit is provided with a protective member that is disposed between the stepping screw portion and the outer peripheral surface of the existing fluid pipe and prevents cutting chips discharged from the existing fluid pipe from entering the stepping screw portion. And
The protective member is extended to cut the vicinity of at least the cutting tool, those are bent by contact with the mounting portion of the cutting tool for stepping in the radial direction and fixed body portion to the cutting unit and a contact portion, wherein the cutting tool is a tube cutting apparatus, characterized that you surface contact with the tapered surface on which the abutting portion is formed on the mounting portion by being stepped radially inward. 前記防護部材は、前記径方向に歩進する切削部と当接するようになっていることを特徴とする請求項１に記載の管切断装置。   2. The tube cutting device according to claim 1, wherein the protective member comes into contact with a cutting portion that advances in the radial direction. 前記切断ユニットは、前記歩進ネジ部を外周方向に沿って覆う筒状の開口を備えた被覆壁を更に有し、
前記防護部材は、前記開口を覆うように、前記被覆壁に取付けられていることを特徴とする請求項１または２に記載の管切断装置。 The cutting unit further includes a covering wall provided with a cylindrical opening that covers the stepped screw portion along the outer peripheral direction,
The pipe cutting device according to claim 1 or 2 , wherein the protection member is attached to the covering wall so as to cover the opening.
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