JP3474481B2 - Existing pipe cutting method and continuous water valve insertion method - Google Patents
Existing pipe cutting method and continuous water valve insertion methodInfo
- Publication number
- JP3474481B2 JP3474481B2 JP05990899A JP5990899A JP3474481B2 JP 3474481 B2 JP3474481 B2 JP 3474481B2 JP 05990899 A JP05990899 A JP 05990899A JP 5990899 A JP5990899 A JP 5990899A JP 3474481 B2 JP3474481 B2 JP 3474481B2
- Authority
- JP
- Japan
- Prior art keywords
- existing pipe
- cutting
- cases
- closed
- case
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Drilling And Boring (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は既設管切断工法およ
びバルブ挿入工法に関するものである。TECHNICAL FIELD The present invention relates to an existing pipe cutting method and a valve insertion method.
【０００２】[0002]
【従来の技術】従来より、不断水におけるバルブ挿入工
法の一つとして、図１６に示す既設管１に切断機５００
を固定し、該切断機５００および既設管１を第１密閉ケ
ース５０１で囲繞し、左右のバイト５０２で既設管１を
切断した後、作業用仕切弁５０３を開閉して、前記既設
管１の切片１０の代わりにストッパやバルブを挿入する
工法が知られている（たとえば、特開平４−１９４４９
１号公報）。2. Description of the Related Art Conventionally, as one of valve insertion construction methods for uninterrupted water, a cutting machine 500 for an existing pipe 1 shown in FIG. 16 is used.
Is fixed, the cutting machine 500 and the existing pipe 1 are surrounded by the first closed case 501, the existing pipe 1 is cut by the left and right bites 502, and the work sluice valve 503 is opened / closed to remove the existing pipe 1. A method of inserting a stopper or a valve instead of the section 10 is known (for example, Japanese Patent Laid-Open No. 4-19449).
No. 1).
【０００３】[0003]
【発明が解決しようとする課題】しかし、前記従来の工
法では、切断機５００を既設管１に固定するので、既設
管１と第１密閉ケース５０１との間に切断機５００を設
置するスペースが必要となるから、第１密閉ケース５０
１が大型化するのは避けられない。また、切り取る切片
１０（既設管１）に切断機５００を固定するので、切断
機５００を固定するための治具等が必要となって、その
ため、装置が複雑になる。また、切断機５００や治具が
複雑であることから、第１密閉ケース５０１が更に大型
化して、そのため、埋設管の周囲を大きく掘削する必要
が生じ、したがって、掘削面積等が大きくなる。However, since the cutting machine 500 is fixed to the existing pipe 1 in the conventional construction method described above, there is no space for installing the cutting machine 500 between the existing pipe 1 and the first closed case 501. First sealed case 50, as required
It is unavoidable that 1 becomes large. Further, since the cutting machine 500 is fixed to the cut-out section 10 (existing pipe 1), a jig or the like for fixing the cutting machine 500 is required, which makes the apparatus complicated. Further, since the cutting machine 500 and the jig are complicated, the first closed case 501 is further increased in size, which necessitates large excavation around the buried pipe, resulting in a large excavation area and the like.
【０００４】本発明は、前記従来の問題に鑑みてなされ
たもので、その目的は、密閉ケースを小型化することが
できる既設管切断工法、切断機を切片（既設管）に固定
する必要のない不断水バルブ挿入工法を提供することで
ある。The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to install an existing pipe cutting method capable of miniaturizing a closed case and to fix a cutting machine to a section (existing pipe). to provide a free without suspension of water supply valve insert construction method.
【０００５】[0005]
【課題を解決するための手段】前記目的を達成するため
に、本発明は、既設管における管軸方向に離間した箇所
を気密状態で囲繞する一対の密閉ケースと、前記密閉ケ
ース内においてカッタ軸のまわりに回転する切削工具
と、前記切削工具をカッタ軸のまわりに回転させる原動
機とを備えた切断装置を用いる。本発明の既設管切断工
法は、既設管における管軸方向に離間した２箇所を左右
一対の密閉ケースによって気密状態で囲繞すると共に、
各密閉ケース内において既設管を切削する切削工具を有
する切断機を各密閉ケースに取り付け、各密閉ケースを
既設管のまわりに回転させることにより、各切削工具を
各密閉ケースと共に既設管の外周に沿って回転させて既
設管を各切削工具によって略円環状に切削する。In order to achieve the above-mentioned object, the present invention provides a pair of hermetically sealed cases which surround airtightly spaced portions of an existing pipe in the axial direction of the tube, and a cutter shaft in the hermetically sealed case. A cutting device having a cutting tool that rotates around a cutter and a prime mover that rotates the cutting tool around a cutter axis is used. The existing pipe cutting method of the present invention encloses two places in the existing pipe, which are separated from each other in the pipe axial direction, in an airtight state by a pair of left and right sealed cases,
Attach a cutting machine with a cutting tool for cutting the existing pipe in each closed case to each closed case, and rotate each closed case around the existing pipe so that each cutting tool is attached to the outer circumference of the existing pipe together with each closed case. The existing pipe is cut in a substantially annular shape by rotating along with each cutting tool.
【０００６】本切断工法によれば、密閉ケースを回転さ
せることで切削工具を既設管の外周に沿って回転させる
から、切削工具を既設管の外周に沿って回転させる機構
を密閉ケース内に設ける必要がない。したがって、密閉
ケースが小型になる。なお、本発明の「密閉ケース」と
は、完全に密閉するという意味ではなく、既設管内を流
れる流体（水など）の圧力に耐える耐圧性と、ある程度
の止水性を持つものをいう。また、「気密状態で囲繞す
る」とは、切削や、切断後のバルブ挿入などの作業に支
障を来さない程度に密閉するという意味であり、たとえ
ば、前記密閉ケースに排水口を設け、該排水口を切削中
に開いておいて、該排水口から水と共に切粉を排出して
もよい。According to this cutting method, since the cutting tool is rotated along the outer circumference of the existing pipe by rotating the closed case, a mechanism for rotating the cutting tool along the outer circumference of the existing pipe is provided in the closed case. No need. Therefore, the sealed case becomes small. The "sealed case" of the present invention does not mean that it is completely sealed, but means that it has a pressure resistance to withstand the pressure of a fluid (water or the like) flowing in an existing pipe and a certain level of water shutoff. Further, "enclosed in an airtight state" means cutting and sealing to an extent that does not hinder work such as valve insertion after cutting. For example, the sealed case is provided with a drain port, The drain may be opened during cutting and the chips may be discharged together with water from the drain.
【０００７】[0007]
【発明の実施の形態】以下、本発明の実施形態を図面に
したがって説明する。図１〜図１３は第１実施形態を示
しており、以下、切断装置、既設管切断工法および不断
水バルブ挿入工法を工程順に説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 13 show the first embodiment, and the cutting device, the existing pipe cutting method and the uninterrupted water valve inserting method will be described below in the order of steps.
【０００８】切断装置
図１に示すように、密閉ケース２は半割れの第１および
第２分割ケース２１，２２と、カッタ取付ケース２３と
を備えてなる。図２に示すように、左右一対の密閉ケー
ス２，２は既設管１に取り付けられて、既設管１におけ
る管軸方向Ｓに離間した２箇所を、該密閉ケース２，２
によって気密状態で囲繞している。前記各ケース２１〜
２３の間や、両分割ケース２１，２２と既設管１との間
は、図３に示すようなゴムリング２４などでシールされ
ている。前記第２分割ケース２２は、管径方向の外方に
突出する分岐状の案内部２２ａを有しており、該案内部
２２ａに前記カッタ取付ケース２３が管径方向に摺動自
在に取り付けられている。第２分割ケース２２における
前記案内部２２ａには、円盤状カッタ（切削工具）３０
が入り込むスリット状の開口２２ｂが形成されている。 Cutting Device As shown in FIG. 1, the hermetically sealed case 2 comprises first and second half-split split cases 21 and 22, and a cutter mounting case 23. As shown in FIG. 2, the pair of left and right sealed cases 2 and 2 are attached to the existing pipe 1, and the two sealed spaces 2 and 2 in the existing pipe 1 are separated from each other in the pipe axis direction S.
Surrounded in an airtight condition by. Each case 21 to
23 and between the two divided cases 21 and 22 and the existing pipe 1 are sealed with a rubber ring 24 or the like as shown in FIG. The second split case 22 has a branched guide portion 22a protruding outward in the pipe radial direction, and the cutter attachment case 23 is attached to the guide portion 22a slidably in the pipe radial direction. ing. A disk-shaped cutter (cutting tool) 30 is provided on the guide portion 22a of the second divided case 22.
A slit-shaped opening 22b is formed to allow the entry.
【０００９】前記一対の密閉ケース２のカッタ取付ケー
ス２３には、切断機３が取り付けられ、前記一対の密閉
ケース２および切断機３で本発明の切断装置が構成され
ている。すなわち、前記カッタ取付ケース２３の外側に
は、工具回転用の第１モータ（原動機の一例）３１が固
定されている一方で、前記カッタ取付ケース２３内に
は、円盤状カッタ３０が収容されている。該円盤状カッ
タ３０は、カッタ取付ケース２３に固定したベアリング
ケース３２に回転自在に支持されたカッタ軸３３に固定
されている。前記第１モータ３１は、第１モータ３１の
出力軸に固定した駆動ギヤ３４およびカッタ軸３３に固
定した従動ギヤ３５を介して、円盤状カッタ３０を回転
させる。なお、円盤状カッタ３０としては、周知のダイ
ヤモンドカッタやメタルソーを用いることができる。ま
た、ベアリングケース３２とカッタ軸３３との間は、図
示しないメカニカルシールによってシールされている。A cutter 3 is attached to the cutter mounting case 23 of the pair of hermetically sealed cases 2, and the pair of hermetically sealed cases 2 and 3 constitutes a cutting device of the present invention. That is, the first motor (an example of a prime mover) 31 for rotating a tool is fixed to the outside of the cutter mounting case 23, while the disk-shaped cutter 30 is accommodated in the cutter mounting case 23. There is. The disc-shaped cutter 30 is fixed to a cutter shaft 33 rotatably supported by a bearing case 32 fixed to the cutter mounting case 23. The first motor 31 rotates the disk-shaped cutter 30 via a drive gear 34 fixed to the output shaft of the first motor 31 and a driven gear 35 fixed to the cutter shaft 33. A known diamond cutter or metal saw can be used as the disc-shaped cutter 30. The bearing case 32 and the cutter shaft 33 are sealed by a mechanical seal (not shown).
【００１０】前記案内部２２ａには、切込送り用フレー
ム３６が固定されている。該切込送り用フレーム３６に
は切込送り用雄ネジ３７が螺合しており、該切込送り用
雄ネジ３７を回転させ切込方向Ｃ（既設管の中心方向）
にねじ込むことにより、カッタ取付ケース２３が切込方
向Ｃに進む。したがって、円盤状カッタ３０を回転させ
ながら、カッタ取付ケース２３を切込方向Ｃに送って円
盤状カッタ３０をスリット状の開口２２ｂに進入させて
いくことで、図４に示すように、円盤状カッタ３０が既
設管１を切削することができる。A cut feed frame 36 is fixed to the guide portion 22a. A cutting feed male screw 37 is screwed into the cutting feed frame 36, and the cutting feed male screw 37 is rotated to perform a cutting direction C (a central direction of an existing pipe).
The cutter mounting case 23 advances in the cutting direction C by screwing in. Therefore, while rotating the disc-shaped cutter 30, the cutter mounting case 23 is sent in the cutting direction C to allow the disc-shaped cutter 30 to enter the slit-shaped opening 22b. The cutter 30 can cut the existing pipe 1.
【００１１】図２に示すように、前記一対の密閉ケース
２，２の間には、ケース回転装置４が配設されている。
該ケース回転装置４は、周方向に２分割された円環状の
スペーサ４０を有している。該スペーサ４０は、一対の
密閉ケース２，２間の相対位置を決めるためのもので、
多数の止ネジ４６で既設管１に固定されていると共に、
該スペーサ４０の両側にはライナ４１が設けてある。前
記２分割されたスペーサ４０の一方には、ギヤボックス
４３が固定されており、該ギヤボックス４３にはケース
回転用の第２モータ４２が固定されている。該第２モー
タはベベルギヤ４７などを介してケース回転用の駆動ギ
ヤ４４を回転させる。該駆動ギヤ４４は、第１および第
２分割ケース２１，２２の外周に固定したケース回転用
の従動ギヤ４５を回転させる。したがって、図４の切込
状態で円盤状カッタ３０を回転させながら、密閉ケース
２を既設管１のまわりに１回転させることにより、既設
管１を２箇所において切断することができる。As shown in FIG. 2, a case rotating device 4 is arranged between the pair of closed cases 2 and 2.
The case rotating device 4 has an annular spacer 40 which is divided into two in the circumferential direction. The spacer 40 is for determining the relative position between the pair of closed cases 2 and 2.
It is fixed to the existing pipe 1 with a large number of set screws 46,
Liners 41 are provided on both sides of the spacer 40. A gear box 43 is fixed to one of the two divided spacers 40, and a second motor 42 for rotating the case is fixed to the gear box 43. The second motor rotates the drive gear 44 for rotating the case via the bevel gear 47 and the like. The drive gear 44 rotates a case rotating driven gear 45 fixed to the outer circumferences of the first and second divided cases 21 and 22. Therefore, the existing pipe 1 can be cut at two locations by rotating the closed case 2 once around the existing pipe 1 while rotating the disc-shaped cutter 30 in the cut state of FIG.
【００１２】図２に示すように、前記一対の密閉ケース
２，２の外側方には、それぞれ、円環状のズレ防止具
５，５が既設管１に固定されている。該ズレ防止具５
は、既設管１の周方向に２分割されており、該ズレ防止
具５には多数の鋼球５０と止ネジ５１が周方向に交互に
設けられている。前記ズレ防止具５は止ネジ５１によっ
て既設管１に固定されていると共に、多数の鋼球５０に
より密閉ケース２を中央側に押すことで、該鋼球５０と
前記ケース回転装置４のライナ４１との間で密閉ケース
２を挟み付けて、密閉ケース２が既設管１の管軸方向に
ズレたり、ブレたりするのを防止する。したがって、密
閉ケース２は、既設管１のまわりを回転する際に、スム
ースに回転する。なお、前記鋼球５０は、図３の管軸方
向Ｓに位置調整可能にズレ防止具５に固定されている。As shown in FIG. 2, annular deviation preventing tools 5 and 5 are fixed to the existing pipe 1 on the outer sides of the pair of closed cases 2 and 2, respectively. The deviation prevention tool 5
Is divided into two in the circumferential direction of the existing pipe 1, and a large number of steel balls 50 and set screws 51 are alternately provided in the circumferential direction in the deviation preventive tool 5. The deviation preventive tool 5 is fixed to the existing pipe 1 by a set screw 51, and the steel ball 50 and the liner 41 of the case rotation device 4 are pushed by pushing the hermetically sealed case 2 toward the center by a large number of steel balls 50. The closed case 2 is sandwiched between and to prevent the closed case 2 from being displaced or shaken in the axial direction of the existing pipe 1. Therefore, the closed case 2 rotates smoothly when rotating around the existing pipe 1. The steel ball 50 is fixed to the deviation preventive tool 5 so that the position thereof can be adjusted in the tube axis direction S of FIG.
【００１３】図３の前記第２分割ケース２２のスリット
状の開口２２ｂには、棒状弁２５が設けてある。図５
（ａ）に示すように、該棒状弁２５は棒状の長い棒状弁
体２６および棒状弁箱２７を備えている。図５（ｂ），
（ｃ）に示すように、前記棒状弁体２６は金属芯２６ａ
に、半月状のシールパッキン２６ｂが一体に成形されて
なり、前記棒状弁箱２７に対して回転可能に取り付けら
れている。該棒状弁体２６は切断時には図５（ｂ）のよ
うに、円盤状カッタ３０の切込を許容し、一方、切断後
に図５（ｃ）のように回転させてスリット状の開口２２
ｂを止水する。A rod-shaped valve 25 is provided in the slit-shaped opening 22b of the second split case 22 shown in FIG. Figure 5
As shown in (a), the rod-shaped valve 25 includes a rod-shaped long rod-shaped valve body 26 and a rod-shaped valve box 27. FIG. 5 (b),
As shown in (c), the rod-shaped valve element 26 has a metal core 26a.
In addition, a half-moon shaped seal packing 26b is integrally formed and is rotatably attached to the rod-shaped valve box 27. At the time of cutting, the rod-shaped valve element 26 allows the disc-shaped cutter 30 to be cut as shown in FIG. 5B, while after cutting, it is rotated as shown in FIG. 5C to make the slit-shaped opening 22.
Stop b.
【００１４】切断工程
つぎに、切断の手順について説明する。まず、図２の既
設管１内に流体（水）が流れている状態で、該既設管１
にケース回転装置４およびスペーサ４０を取り付けると
共に、ケース回転装置４の両側に、密閉ケース２および
ズレ防止具５を取り付けて、既設管１における管軸方向
Ｓに離間した２箇所を一対の密閉ケース２，２によって
気密状態で囲繞する。なお、切断機３は、密閉ケース２
のカッタ取付ケース２３に予め取り付けておく。また、
図５（ａ）の回転止めボルト２６ｃにより、棒状弁２５
を図５（ｂ）のように開弁した状態で固定しておく。つ
いで、図３の第１モータ３１を回転させて円盤状カッタ
３０を高速回転させつつ、切込送り用雄ネジ３７を切込
方向Ｃにネジ込んで、図１の二点鎖線で示すように、円
盤状カッタ３０の外周部が既設管１の内周に外接するよ
うな位置まで円盤状カッタ３０を送ることにより、切込
が完了する。 Cutting Process Next, a cutting procedure will be described. First, with the fluid (water) flowing in the existing pipe 1 in FIG.
The case rotating device 4 and the spacer 40 are attached to the case rotating device 4, and the sealing case 2 and the deviation preventive tool 5 are attached to both sides of the case rotating device 4 so as to form a pair of hermetically sealed cases at two locations separated in the pipe axis direction S of the existing pipe 1. It is surrounded by 2 and 2 in an airtight state. The cutting machine 3 is a closed case 2.
It is attached to the cutter attachment case 23 in advance. Also,
By using the rotation stop bolt 26c shown in FIG.
Is fixed with the valve opened as shown in FIG. 5 (b). Then, while rotating the first motor 31 of FIG. 3 to rotate the disk-shaped cutter 30 at a high speed, the cutting feed male screw 37 is screwed in the cutting direction C, as shown by the chain double-dashed line in FIG. The cutting is completed by sending the disc-shaped cutter 30 to a position where the outer peripheral portion of the disc-shaped cutter 30 circumscribes the inner periphery of the existing pipe 1.
【００１５】この切込後、図４のケース回転用の第２モ
ータ４２を駆動させると、ベベルギヤ４７、一対の駆動
ギヤ４４および従動ギヤ４５を介して、一対の密閉ケー
ス２が既設管１のまわりを回転する。これにより、円盤
状カッタ３０は密閉ケース２と共に既設管１の外周に沿
って回転しながらカッタ軸３３のまわりを回転して、既
設管１を略円環状に切削する。この切削後、切込送り用
雄ネジ３７を逆回転させて円盤状カッタ３０をカッタ取
付ケース２３と共にスライド移動させ、図３の非切込位
置まで退避させる。この退避後、図５の棒状弁体２６を
９０°回転させて、スリット状の開口２２ｂから流体
（水）が流れ出るのを防止する。この止水後、次の切片
除去工程に入る。After the cutting, when the second motor 42 for case rotation shown in FIG. 4 is driven, the pair of hermetically sealed cases 2 is connected to the existing pipe 1 via the bevel gear 47, the pair of drive gears 44 and the driven gear 45. Rotate around. As a result, the disk-shaped cutter 30 rotates around the cutter shaft 33 while rotating along with the closed case 2 along the outer circumference of the existing pipe 1, and cuts the existing pipe 1 into a substantially annular shape. After this cutting, the cutting feed male screw 37 is reversely rotated to slide the disk-shaped cutter 30 together with the cutter mounting case 23 and retract it to the non-cutting position in FIG. After this withdrawal, the rod-shaped valve body 26 of FIG. 5 is rotated by 90 ° to prevent the fluid (water) from flowing out from the slit-shaped opening 22b. After this water stoppage, the next section removing step is started.
【００１６】切片除去工程
前記切断後、図２の既設管１から切断機３をカッタ取付
ケース２３と共に取り外す。また、ズレ防止具５、ケー
ス回転装置４、スペーサ４０などを既設管１から取り外
す。こうして、図６に示すように、密閉ケース２の第１
分割ケース２１、第２分割ケース２２および棒状弁２５
のみが残された状態になる。この後、両密閉ケース２，
２の間に切片１０を持ち上げるための持上げバンド１１
を切片１０に固定すると共に、既設管１における密閉ケ
ース２，２の両側方に、割短管６を取り付ける。該割短
管６は、既設管１の周方向に２つに分割されており、ゴ
ムパッキンを挿入するパッキン挿入部６０と、シートパ
ッキン（図示せず）を圧縮する板状フランジ部６１とを
両端に有する。また、該割短管６は溝６２に仮止水用の
Ｏリング６３を備えている。[0016] After Sections removing step said cutting, removing the cutter 3 with the cutter mounting case 23 from the existing pipe 1 of Figure 2. Further, the deviation preventive tool 5, the case rotating device 4, the spacer 40 and the like are removed from the existing pipe 1. Thus, as shown in FIG.
Split case 21, second split case 22 and rod-shaped valve 25
Only the state is left. After this, both sealed cases 2,
Lifting band 11 for lifting the section 10 between 2
Is fixed to the section 10, and the split short pipes 6 are attached to both sides of the closed cases 2 and 2 in the existing pipe 1. The split short pipe 6 is divided into two in the circumferential direction of the existing pipe 1, and includes a packing insertion portion 60 for inserting a rubber packing and a plate-like flange portion 61 for compressing a sheet packing (not shown). Have on both ends. Further, the split short pipe 6 is provided with an O-ring 63 for temporarily stopping water in the groove 62.
【００１７】つぎに、図７に示すように、前記両密閉ケ
ース２，２および割短管６を既設管１ごと作業用タンク
７により気密状態で囲繞すると共に、昇降シャフト７６
を持上げバンド１１に連結する。該作業用タンク７は、
上下（周方向）に分割された作業用下部タンク７１，７
２、作業用仕切弁７３および作業用上部タンク７４から
なる。一方、割短管６および密閉ケース２をスライド移
動させる押棒７５を、前記作業用タンク７による囲繞前
に作業用下部タンク７１，７２にねじ込むと共に、図８
のブラケット７５ａを介して該押棒７５の先端部を割短
管６に接続する。該押棒７５は、たとえば長い雄ネジか
らなり、該押棒７５を右回転させることにより割短管６
を中央側に移動でき、一方、押棒７５を左回転させるこ
とにより側方に引き戻すことができるようになってい
る。今、図８の状態において、押棒７５を右回転させる
ことにより、割短管６が押されて中央へスライド移動
し、該割短管６が密閉ケース２を押すことで、割短管６
が中央に向って移動する。密閉ケース２が被切削溝部１
２を乗り超えて、切片１０上に乗り移った後、前記押棒
７５を逆回転させると、図９のように割短管６のみが側
方（左側）に戻る。その後、昇降シャフト７６を引き上
げて、切片１０を密閉ケース２と共に、作業用下部タン
ク７１，７２から図１０の作業用上部タンク７４に取り
出し、作業用仕切弁７３を閉弁する。この閉弁後、作業
用上部タンク７４と共に切片１０および密閉ケース２を
取り出す。なお、前記図７、図９〜１１、図１３におい
ては、仮止水用のＯリング６３の図示を省略している。Next, as shown in FIG. 7, both of the hermetically sealed cases 2 and 2 and the split short pipe 6 are enclosed together with the existing pipe 1 by a working tank 7 in an airtight state, and an elevating shaft 76 is provided.
Lift and connect to the band 11. The working tank 7 is
Lower work tanks 71, 7 divided vertically (circumferential direction)
2. It consists of a work sluice valve 73 and a work upper tank 74. On the other hand, a push rod 75 for slidingly moving the split short pipe 6 and the closed case 2 is screwed into the lower working tanks 71 and 72 before being surrounded by the working tank 7,
The tip portion of the push rod 75 is connected to the split short pipe 6 via the bracket 75a. The push rod 75 is made of, for example, a long male screw, and by rotating the push rod 75 clockwise, the split short pipe 6
Can be moved to the center side, while it can be pulled back to the side by rotating the push rod 75 counterclockwise. Now, in the state of FIG. 8, by rotating the push rod 75 to the right, the split short pipe 6 is pushed and slid to the center, and the split short pipe 6 pushes the closed case 2, whereby the split short pipe 6 is pushed.
Moves toward the center. The closed case 2 is the groove to be cut 1
When the push rod 75 is rotated in the reverse direction after passing over 2 and moving on the section 10, only the split short pipe 6 returns to the side (left side) as shown in FIG. After that, the elevating shaft 76 is pulled up, the section 10 together with the closed case 2 is taken out from the lower work tanks 71 and 72 to the upper work tank 74 of FIG. 10, and the work sluice valve 73 is closed. After this valve is closed, the section 10 and the closed case 2 are taken out together with the work upper tank 74. Note that the O-ring 63 for temporary water stoppage is omitted in FIGS. 7, 9 to 11 and FIG. 13.
【００１８】バルブ挿入工程
前記切片１０の取出後、図１１のように、たとえばバタ
フライ弁８のような挿入用のバルブを作業用上部タンク
７４内に収容する。このバタフライ弁８は、両端に円環
板状の板状フランジ部８０，８０を有しており、各フラ
ンジ部８０，８０には、各々、たとえば円環板状のシー
トパッキン８１が接着してある。また、該バタフライ弁
８の挿入時には、減速機８２（図１２）を取り外してお
く。その後、作業用仕切弁７３を開弁し、更に、バタフ
ライ弁８を下方に降ろし、図１２の押棒７５を右回転さ
せて、割短管６をバタフライ弁８に向ってスライド移動
させると、やがて、図１３のように、割短管６の板状フ
ランジ部６１がシートパッキン８１に接触し、押棒７５
の軸力によりシートパッキン８１が２枚の板状フランジ
部６１，８０の間で圧縮され、割短管６とバタフライ弁
８との間の仮止水が図られる。一方、割短管６と既設管
１との間は、図１４の予め割短管６に装着されたＯリン
グ６３により仮止水されている。この仮止水後、図１３
の作業用タンク７内の水を排水し、更に、一対の板状フ
ランジ部６１，８０を図１４の締結ボルト８３で締結
し、割短管６とバタフライ弁８との間の本止水を行う。
この後、図１３の作業用タンク７を解体し、図１４の既
設管１および割短管６に割押輪６５を装着して本止水用
のゴムリング６４を割短管６のパッキン挿入部６０に押
し込む一方、バタフライ弁８に減速機８２を取り付け
る。 Valve Inserting Step After taking out the section 10, as shown in FIG. 11, an inserting valve such as the butterfly valve 8 is housed in the upper working tank 74. This butterfly valve 8 has annular plate-shaped plate-like flange portions 80, 80 at both ends. For example, an annular plate-like sheet packing 81 is adhered to each flange portion 80, 80. is there. Further, when the butterfly valve 8 is inserted, the speed reducer 82 (Fig. 12) is removed. After that, the work sluice valve 73 is opened, the butterfly valve 8 is further lowered, the push rod 75 in FIG. 12 is rotated clockwise, and the split short pipe 6 is slid toward the butterfly valve 8. As shown in FIG. 13, the plate-shaped flange portion 61 of the split short tube 6 comes into contact with the sheet packing 81, and the push rod 75
The seat packing 81 is compressed between the two plate-like flange portions 61 and 80 by the axial force of, and temporary water stop between the split short pipe 6 and the butterfly valve 8 is achieved. On the other hand, the space between the split short pipe 6 and the existing pipe 1 is temporarily stopped by an O-ring 63 mounted in advance on the split short pipe 6 in FIG. After this temporary stoppage of water, FIG.
The water in the working tank 7 is drained, and the pair of plate-shaped flange portions 61 and 80 are fastened with the fastening bolts 83 shown in FIG. 14 to prevent the main water stop between the split short pipe 6 and the butterfly valve 8. To do.
After that, the work tank 7 of FIG. 13 is disassembled, the split push ring 65 is attached to the existing pipe 1 and the split short pipe 6 of FIG. 14, and the rubber ring 64 for the main water stop is attached to the packing insertion portion of the split short pipe 6. While being pushed into 60, the speed reducer 82 is attached to the butterfly valve 8.
【００１９】このように、本切断工法では、図２の切断
時に密閉ケース２を回転させることで円盤状カッタ３０
を既設管１の外周に沿って回転させるから、円盤状カッ
タ３０を既設管１のまわりに回転させる機構、つまり、
ケース回転装置４を密閉ケース２内に設ける必要がな
く、したがって、密閉ケース２の小型化を図り得る。ま
た、本バルブ挿入工法では、図７の作業用タンク７を必
要とし、該作業用タンク７が密閉ケース２に比べると著
しく大きいのであるが、切断機３を除去した密閉ケース
２を作業用タンク７によって収容するから、作業用タン
ク７が従来よりも小さくなる。As described above, in this cutting method, the disk-shaped cutter 30 is rotated by rotating the closed case 2 at the time of cutting in FIG.
Is rotated along the outer circumference of the existing pipe 1, a mechanism for rotating the disk-shaped cutter 30 around the existing pipe 1, that is,
Since it is not necessary to provide the case rotating device 4 in the closed case 2, the closed case 2 can be downsized. In addition, this valve insertion method requires the work tank 7 of FIG. 7, and the work tank 7 is significantly larger than the closed case 2, but the closed case 2 from which the cutting machine 3 is removed is used as the work tank. Since it is accommodated by 7, the working tank 7 becomes smaller than before.
【００２０】ところで、前記実施形態では、切削工具と
して円盤状カッタ３０を用いたが、本発明では円盤状カ
ッタ３０に代えて図１５（ａ）のようにエンドミル３０
Ａを用いてもよい。また、棒状弁体２６を回転させる代
わりに、図１５（ｂ）の板状弁体２６Ａを挿入してもよ
い。また、前記実施形態では、図２のケース回転用の第
２モータ４２を有するケース回転装置４を用いて、密閉
ケース２および切断機３を既設管１のまわりに回転させ
たが、本発明において、前記密閉ケース２を回転させる
方法としては、ウィンチや重機（土木建設機械）を用い
てもよいし、あるいは、人力で回転させてもよい。ま
た、本不断水バルブ挿入工法では、バタフライ弁に代え
て仕切弁を挿入するようにしてもよい。By the way, in the above-mentioned embodiment, the disc-shaped cutter 30 is used as the cutting tool, but in the present invention, instead of the disc-shaped cutter 30, the end mill 30 as shown in FIG.
A may be used. Further, instead of rotating the rod-shaped valve body 26, the plate-shaped valve body 26A of FIG. 15 (b) may be inserted. Further, in the above-described embodiment, the closed case 2 and the cutting machine 3 are rotated around the existing pipe 1 by using the case rotation device 4 having the second motor 42 for case rotation shown in FIG. As a method for rotating the closed case 2, a winch or a heavy machine (civil engineering machine) may be used, or it may be rotated manually. Further, in the present uninterrupted water valve insertion method, a sluice valve may be inserted instead of the butterfly valve.
【００２１】[0021]
【発明の効果】以上説明したように、本発明によれば、
密閉ケースを既設管のまわりに回転させて、既設管を切
断するから、既設管に切断機を固定する必要がないの
で、既設管の外周面に密閉ケースの内周面を接近させる
ことができる。したがって、密閉ケースの小型化を図り
得ると共に、密閉ケースが小さくなるので、掘削面積を
小さくすることができる。As described above, according to the present invention,
Since the closed case is rotated around the existing pipe to cut the existing pipe, it is not necessary to fix the cutting machine to the existing pipe, so that the inner peripheral surface of the closed case can be brought close to the outer peripheral surface of the existing pipe. . Therefore, it is possible to reduce the size of the closed case and reduce the size of the closed case, so that the excavation area can be reduced.
【図１】本発明の既設管切断工法の一実施形態を示す密
閉ケースの横断面図である。FIG. 1 is a cross-sectional view of a closed case showing an embodiment of an existing pipe cutting method of the present invention.
【図２】密閉ケースおよび切断機等の全体を示す縦断面
図である。FIG. 2 is a vertical cross-sectional view showing the entire sealed case, cutting machine, and the like.
【図３】主として切断機を示す切込前の縦断面図であ
る。FIG. 3 is a vertical sectional view mainly showing a cutting machine before cutting.
【図４】同切込後の縦断面図である。FIG. 4 is a vertical cross-sectional view after the cut.
【図５】棒状弁の拡大断面図である。FIG. 5 is an enlarged cross-sectional view of a rod valve.
【図６】切断後の全体を示す断面図である。FIG. 6 is a cross-sectional view showing the whole structure after cutting.
【図７】作業用タンクを組み立てた状態を示す縦断面図
である。FIG. 7 is a vertical cross-sectional view showing a state in which a work tank is assembled.
【図８】押棒等の構造を示す断面図である。FIG. 8 is a cross-sectional view showing a structure of a push rod or the like.
【図９】押棒を用いて密閉ケースを切片上に移動した状
態を示す全体の断面図である。FIG. 9 is an overall cross-sectional view showing a state in which the closed case is moved onto the section using a push rod.
【図１０】切片を除去した状態を示す断面図である。FIG. 10 is a cross-sectional view showing a state in which a section is removed.
【図１１】バルブを上部タンクに収容した状態を示す断
面図である。FIG. 11 is a cross-sectional view showing a state where the valve is housed in the upper tank.
【図１２】仮止水の工程を示す部分断面図である。FIG. 12 is a partial cross-sectional view showing a process of temporary water stoppage.
【図１３】同全体を示す断面図である。FIG. 13 is a cross-sectional view showing the entire structure.
【図１４】完成状態を示す断面図であるFIG. 14 is a sectional view showing a completed state.
【図１５】変形例を示す要部の断面図である。FIG. 15 is a cross-sectional view of a main part showing a modified example.
【図１６】従来の切断工法を示す断面図である。FIG. 16 is a cross-sectional view showing a conventional cutting method.
１：既設管 １０：切片 ２：密閉ケース ３：切断機 ３０：円盤状カッタ ３１：（工具回転用の）第１モータ ３３：カッタ軸 ７：作業用タンク 1: Existing pipe 10: intercept 2: Sealed case 3: Cutting machine 30: Disc-shaped cutter 31: First motor (for tool rotation) 33: Cutter axis 7: Working tank
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山下 保 高槻市唐崎北３丁目27番２号 株式会社 スイケンテクノロジー内 (56)参考文献 特開 平３−14996（ＪＰ，Ａ) 特開 平９−79430（ＪＰ，Ａ) 特開 平７−158753（ＪＰ，Ａ) 実開 平７−33528（ＪＰ，Ｕ) 米国特許2571916（ＵＳ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) F16L 55/00,1/02 F16L 44/04 B23D 21/00 - 21/06 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasushi Yamashita 3-27-2 Karazakikita, Takatsuki-shi, Suiken Technology Co., Ltd. (56) Reference JP-A-3-14996 (JP, A) JP-A-9- 79430 (JP, A) JP-A 7-158753 (JP, A) Actually developed 7-33528 (JP, U) US Patent 2571916 (US, A) (58) Fields investigated (Int.Cl. 7 , DB) (Name) F16L 55 / 00,1 / 02 F16L 44/04 B23D 21/00-21/06
Claims (5)
既設管における管軸方向に離間した２箇所を左右一対の
密閉ケースによって気密状態で囲繞すると共に、前記各
密閉ケースに支持された回転軸のまわりに回転して前記
既設管を前記密閉ケース内において切削する切削工具を
有する切断機を前記各密閉ケースに取り付け、前記各密
閉ケースを既設管のまわりに回転させることにより、前
記各切削工具を前記各密閉ケースと共に既設管の外周に
沿って回転させながら、前記切削工具を前記回転軸のま
わりに回転させて、前記既設管を前記各切削工具によっ
て略円環状に切削し、該切削後、既設管ごと前記両密閉
ケースを作業用タンクによって気密状態で囲繞し、前記
両密閉ケースをスライド移動させた後、前記切片を取り
出す既設管切断工法。1. In a state where a fluid is flowing in the existing pipe, a pair of left and right sealed cases surrounds the existing pipe in two places spaced apart in the axial direction of the existing pipe in an airtight state and is supported by each of the sealed cases. By attaching a cutting machine having a cutting tool that rotates around the rotation axis to cut the existing pipe in the closed case to each closed case, and rotate each closed case around the existing pipe, each of the above While rotating the cutting tool along the outer circumference of the existing pipe together with each of the closed cases, the cutting tool is rotated around the rotation axis, the existing pipe is cut into a substantially annular shape by each of the cutting tools, After cutting, an existing pipe cutting method in which the both sealed cases are surrounded in an airtight state by a working tank together with the existing pipes, the both sealed cases are slid, and then the slices are taken out. .
削工具を前記各密閉ケース内において回転させながら、
前記各密閉ケースを既設管のまわりに回転させること
で、前記切削工具を既設管の周方向に送って既設管を切
断する既設管切断工法。2. The method according to claim 1, wherein the cutting tool is rotated in each of the hermetically sealed cases while the cutting tool is being sent to the inner circumference of the existing pipe,
An existing pipe cutting method for cutting the existing pipe by sending the cutting tool in the circumferential direction of the existing pipe by rotating each of the closed cases around the existing pipe.
相対位置を決めるスペーサが配設されている既設管切断
工法。3. The existing pipe cutting method according to claim 1, wherein a spacer that determines a relative position of the pair of closed cases is provided between the pair of closed cases.
用いる既設管切断工法。 4. The end mill or disk-shaped cutter as the cutting tool according to claim 1.
Existing pipe cutting method used.
片に代えてバルブを挿入する不断水バルブ挿入工法。5. An uninterrupted water valve insertion method in which a valve is inserted in place of the piece after taking out the piece of claim 1 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05990899A JP3474481B2 (en) | 1998-03-13 | 1999-03-08 | Existing pipe cutting method and continuous water valve insertion method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8248898 | 1998-03-13 | ||
| JP10-82488 | 1998-03-13 | ||
| JP05990899A JP3474481B2 (en) | 1998-03-13 | 1999-03-08 | Existing pipe cutting method and continuous water valve insertion method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11325377A JPH11325377A (en) | 1999-11-26 |
| JP3474481B2 true JP3474481B2 (en) | 2003-12-08 |
Family
ID=26400980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05990899A Expired - Lifetime JP3474481B2 (en) | 1998-03-13 | 1999-03-08 | Existing pipe cutting method and continuous water valve insertion method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3474481B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7190174B2 (en) * | 2019-05-09 | 2022-12-15 | 株式会社水道技術開発機構 | Fluid pipe full-cut cutting method and full-cut cutting device |
-
1999
- 1999-03-08 JP JP05990899A patent/JP3474481B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11325377A (en) | 1999-11-26 |
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