JP2006132283A - Construction method for replacing existing pipe - Google Patents

Construction method for replacing existing pipe Download PDF

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JP2006132283A
JP2006132283A JP2004325723A JP2004325723A JP2006132283A JP 2006132283 A JP2006132283 A JP 2006132283A JP 2004325723 A JP2004325723 A JP 2004325723A JP 2004325723 A JP2004325723 A JP 2004325723A JP 2006132283 A JP2006132283 A JP 2006132283A
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pipe
existing pipe
crushing
rod
metal
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JP4429875B2 (en
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Yasushi Kitayama
康 北山
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Sekisui Chemical Co Ltd
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Sekisui Chemical Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To easily and rapidly perform the operation of replacing an existing pipe 2 with a renewed pipe 2a, in terms of the compositely constructed existing pipe 2 which is buried in the ground and constructed by connecting a plurality of nonmetallic pipes 3-5 by means of metal joints 6 and 7. <P>SOLUTION: This construction method comprises: a preparation step of recognizing positions where the metal joints 6 and 7 exist in the existing pipe 2; a crushing step of crushing the recognized metal joints 6 and 7 from the insides of them; and a renewal step of arranging the renewed pipe 2a in a trace, where the existing pipe 2 is crushed, from an upstream side in a crushing direction, while crushing the nonmetallic pipes 3-5 in either of the axial directions of the pipe from the insides of the pipes 3-5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、地中に埋設されているとともに複数の非金属製管を金属製継手で接続してなる既設管を更新管に入れ替える工法に関する。   The present invention relates to a method of replacing an existing pipe that is buried in the ground and is formed by connecting a plurality of non-metallic pipes with a metal joint with an update pipe.

例えば既設管が老朽化した場合や、径の異なる管と取り替えたい場合等に、既設管の入れ替えを行う。この既設管の入れ替えは、例えば地面を掘削することにより、既設管を取り出してから、更新管を埋設するようにするが、掘削作業が面倒で手間がかかる。   For example, the existing pipe is replaced when the existing pipe is old or when it is desired to replace the pipe with a different diameter. The replacement of the existing pipe is, for example, by excavating the ground to take out the existing pipe and then burying the update pipe. However, the excavation work is troublesome and takes time and effort.

これに対し、既設管内にロッドを挿入し、このロッドの先端に切断刃を取り付けるとともに、この切断刃に更新管を取り付け、このロッドを引っ張り操作することにより、前記切断刃で前記既設管をその内側から切り裂きながら、更新管を引き込むようにした入れ替え工法が考えられている（特許文献１参照。）。この入れ替え工法では、既設管を金属製管とすることを前提としている。   On the other hand, a rod is inserted into the existing pipe, a cutting blade is attached to the tip of the rod, an update pipe is attached to the cutting blade, and the rod is pulled to operate the existing pipe with the cutting blade. A replacement method in which the renewal pipe is pulled in while being cut from the inside is considered (see Patent Document 1). This replacement method assumes that the existing pipe is made of metal.

ところで、地中に埋設している既設管として、例えば合成樹脂、石綿または陶等の非金属管の複数個を一列に並べて、非金属製管それぞれを金属製継手で接続したような複合構成になったものがある。
特開平１１−１１７６７６号公報 By the way, as existing pipes buried in the ground, for example, a composite configuration in which a plurality of non-metallic pipes such as synthetic resin, asbestos or ceramics are arranged in a row and each non-metallic pipe is connected by a metal joint. There is something that has become.
JP-A-11-117676

上記従来例では、複数の非金属製管を金属製継手で接続してなる複合構成の既設管に関する入れ替えをまったく想定していない。仮に、このような既設管の場合、上記従来例の入れ替え工法では、金属製継手を破砕することができない。ここに改良の余地がある。   In the above conventional example, no replacement is assumed for existing pipes having a composite structure in which a plurality of non-metallic pipes are connected by metal joints. Temporarily, in the case of such an existing pipe, the metal joint cannot be crushed by the replacement method of the conventional example. There is room for improvement here.

本発明は、地中に埋設されているとともに複数の非金属製管を金属製継手で接続してなる複合構成の既設管を、簡単かつ迅速に更新管に入れ替えできるようにすることを目的としている。   An object of the present invention is to make it possible to easily and quickly replace an existing pipe having a composite structure in which a plurality of non-metallic pipes are buried in the ground and connected by metal joints with a renewal pipe. Yes.

本発明は、地中に埋設されているとともに複数の非金属製管を金属製継手で接続してなる既設管を更新管に入れ替える工法であって、既設管における金属製継手の存在位置を認識する準備工程と、前記認識した金属製継手をその内側から破砕する破砕工程と、前記非金属製管をその内側から管軸方向一方へ破砕しながら、その破砕方向上流側から前記既設管の破砕跡に更新管を配置する更新工程とを含むことを特徴としている。   The present invention is a method of replacing an existing pipe formed by connecting a plurality of non-metallic pipes with metal joints, which is buried in the ground, and recognizing the positions of the metal joints in the existing pipes A crushing step of crushing the recognized metal joint from the inside thereof, and crushing the existing pipe from the crushing direction upstream side while crushing the non-metallic pipe from the inside to one side in the tube axis direction. And an update step of arranging an update tube on the mark.

この場合、土壌を堀削して既設管を取り出すことなく、地中に埋設された既設管を更新管に入れ替えることが可能になる。これにより、土壌を堀削して既設管を取り出してから、更新管を設置するような古典的な工法に比べて、入れ替え作業が簡単かつ迅速に行えるようになる。このように、既設管の入れ替えに要する時間と労力が軽減されるので、入れ替えコストの低減が可能になる。   In this case, it is possible to replace the existing pipe buried in the ground with an update pipe without excavating the soil and taking out the existing pipe. Thereby, after excavating the soil and taking out the existing pipe, the replacement work can be performed easily and quickly compared to the classic method of installing the update pipe. In this way, the time and labor required to replace the existing pipe are reduced, so that the replacement cost can be reduced.

好ましくは、前記準備工程は、前記既設管に通ずる二つの立坑を設け、先端に金属探査装置を取り付けたロッドを前記一方立坑側から既設管内に挿入して他方立坑側へ送ることにより前記金属探査装置で金属製継手を検出したうえで、当該検出位置を記録するものとされる。   Preferably, in the preparation step, the metal exploration is performed by providing two shafts communicating with the existing pipe, inserting a rod having a metal exploration device at a tip thereof into the existing pipe from the one shaft side, and sending the rod to the other shaft side. The detection position is recorded after the metal joint is detected by the apparatus.

この場合、探査動作をロッドの送りだけで行えるから、探査作業が簡単かつ迅速に行えるようになる。   In this case, since the exploration operation can be performed only by feeding the rod, the exploration work can be performed easily and quickly.

好ましくは、前記破砕工程は、ロッドの先端に継手破砕装置を取り付け、この継手破砕装置を前記準備工程で記録した金属製継手の存在位置に送って、当該金属製継手を破砕するものとされる。   Preferably, in the crushing step, a joint crushing device is attached to the tip of the rod, and the joint crushing device is sent to the position of the metal joint recorded in the preparation step to crush the metal joint. .

この場合、破砕動作をロッドの送りだけで行えるから、破砕作業が簡単かつ迅速に行えるようになる。   In this case, since the crushing operation can be performed only by feeding the rod, the crushing operation can be performed easily and quickly.

好ましくは、前記破砕工程は、前記他方立坑側に到達した前記ロッドの先端から金属探査装置を取り外して、代わりに継手破砕装置を取り付け、前記ロッドを前記一方立坑側に牽引することにより前記準備工程で記録した金属製継手の存在位置に送って当該金属製継手を破砕するものとされる。   Preferably, in the crushing step, the preparation step is performed by removing a metal exploration device from a tip of the rod that has reached the other shaft side, attaching a joint crushing device instead, and pulling the rod to the one shaft side. It is assumed that the metal joint is crushed by being sent to the position where the metal joint recorded in (1) is present.

この場合、探査動作で送ったロッドを引き戻す過程で破砕動作を行えるから、無駄な動作を省けるようになり、破砕作業を効率よく迅速に行えるようになる。   In this case, since the crushing operation can be performed in the process of pulling back the rod sent by the exploration operation, it is possible to omit a useless operation and to perform the crushing operation efficiently and quickly.

好ましくは、前記更新工程は、前記ロッドの先端を前記一方立坑側から挿入して他方立坑側に突出させて、このロッドの先端にドリルの先端側を取り付けるとともに、このドリルの後端側に更新管を取り付け、このロッドを前記一方立坑側に引き戻すことにより前記ドリルで前記既設管の非金属製管をその内側から拡径破砕しながら、当該既設管の破砕跡に更新管を配置するものとされる。   Preferably, in the updating step, the tip end of the rod is inserted from the one shaft side and protruded to the other shaft side, and the tip end side of the drill is attached to the tip end of the rod, and the tip end side of the drill is updated. A pipe is attached, and the rod is pulled back to the one shaft side, and the non-metallic pipe of the existing pipe is expanded and crushed from the inside by the drill, and the renewal pipe is arranged at the crushing mark of the existing pipe. Is done.

この場合、既設管の破砕と更新管の設置とを同時に行えるから、入れ替え作業を効率よく迅速に行えるようになる。   In this case, since the existing pipe can be crushed and the renewal pipe can be installed at the same time, the replacement work can be performed efficiently and quickly.

本発明によれば、地中に埋設されているとともに複数の非金属製管を金属製継手で接続してなる複合構成の既設管について、更新管に入れ替える作業を、地中を掘削することなく簡単かつ迅速に行うことができる。そのため、既設管の入れ替えに要する時間と労力が軽減されるので、入れ替えコストの低減に貢献できる。   According to the present invention, for an existing pipe having a composite structure in which a plurality of non-metallic pipes are buried in the ground and connected by metal joints, the work of replacing the renewal pipes without excavating the ground. It can be done easily and quickly. Therefore, the time and labor required to replace the existing pipe are reduced, which can contribute to the reduction of the replacement cost.

以下、本発明の実施形態を図１から図１３に示して説明する。図中、１は土壌であり、この土壌１の内部には、既設管２が地表面と略平行に埋設されている。   Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the figure, 1 is soil, and an existing pipe 2 is embedded in the soil 1 substantially in parallel with the ground surface.

この既設管２が老朽化した場合や、径の異なる管と取り替えたい場合等に、既設管２を更新管２ａと入れ替えることを行う。   When this existing pipe 2 is aged or when it is desired to replace it with a pipe having a different diameter, the existing pipe 2 is replaced with the renewal pipe 2a.

既設管２は、例えば三つの非金属製管３，４，５を一列に並べてそれぞれを金属製継手６，７で接続した複合構成になっている。また、更新管２ａは、既設管２と同様、三つの非金属製管３ａ，４ａ，５ａを一列に並べてそれぞれを金属製継手６ａ，７ａで接続した複合構成になっている。   The existing pipe 2 has, for example, a composite configuration in which three non-metallic pipes 3, 4, 5 are arranged in a line and connected by metal joints 6, 7. In addition, the renewal pipe 2a has a composite configuration in which three non-metallic pipes 3a, 4a, 5a are arranged in a line and are connected by metal joints 6a, 7a, similarly to the existing pipe 2.

既設の非金属製管３〜５は、例えばポリエチレンや塩化ビニール等の合成樹脂、石綿または陶等の非金属材料とされる。新しく入れ替える非金属製管３ａ〜５ａは、ポリエチレンや塩化ビニール等の合成樹脂、あるいは鋼等の金属管といった適宜の材料とすることができる。既設の金属製継手６，７および新しく入れ替える金属製継手６ａ，７ａは、一般
的に公知のもので、例えば二つの非金属製管の突合せ端を囲むように配置されて締め付けられるような筒状のものである。 The existing nonmetallic pipes 3 to 5 are made of, for example, a synthetic resin such as polyethylene or vinyl chloride, or a nonmetallic material such as asbestos or porcelain. The non-metallic pipes 3a to 5a to be newly replaced can be made of an appropriate material such as a synthetic resin such as polyethylene or vinyl chloride, or a metal pipe such as steel. The existing metal joints 6 and 7 and the newly replaced metal joints 6a and 7a are generally known, for example, cylindrical shapes that are arranged so as to surround the butt ends of two non-metallic pipes and tightened. belongs to.

次に、既設管２を更新管２ａと入れ替える作業ならびに手順を詳細に説明する。   Next, the work and procedure for replacing the existing pipe 2 with the update pipe 2a will be described in detail.

また、この入れ替え工法では、堀削装置１０、金属探査装置２０、継手破砕装置３０、ドリル４０を用いるので、まず、これらの構成を説明する。   Moreover, since this excavation method uses the excavation apparatus 10, the metal exploration apparatus 20, the joint crushing apparatus 30, and the drill 40, these structures are demonstrated first.

堀削装置１０は、長尺なロッド１１を螺旋回転させながら送り出したり引き戻したりする機能を有しており、一般的に公知のものを利用できる。   The excavation device 10 has a function of feeding and pulling back the long rod 11 while spirally rotating, and generally known devices can be used.

金属探査装置２０は、特定の金属を感知する機能を有しており、一般的に公知の金属探知機等を利用できる。   The metal exploration device 20 has a function of sensing a specific metal, and a generally known metal detector or the like can be used.

継手破砕装置３０は、金属製継手６，７をその内側から破砕するものであり、例えば図６に示すように、中心基体３１の外周において９０度ごとの二カ所に油圧ジャッキ３２，３３を設け、各油圧ジャッキ３２，３３のそれぞれ１８０度対向する二カ所に支持脚３４，３５を設けた構成である。つまり、この継手破砕装置３０は、その支持脚３４，３５を破砕対象となる既設管２の金属製継手６，７の内周に当接させた状態で、油圧ジャッキ３２，３３のピストン先端に取り付けてある先鋭部材３６，３７を径方向外向きに突出させることにより金属製継手６，７の内側から破砕するようになっている。この継手破砕装置３０は、図示していないが、円周等間隔の複数ヶ所のすべてに油圧ジャッキを設けた構成であってもよく、特に限定されるものではない。   The joint crushing device 30 crushes the metal joints 6 and 7 from the inside. For example, as shown in FIG. 6, hydraulic jacks 32 and 33 are provided at two positions every 90 degrees on the outer periphery of the central base 31. In this configuration, the support legs 34 and 35 are provided at two positions opposite to each of the hydraulic jacks 32 and 33 by 180 degrees. In other words, the joint crushing device 30 is attached to the piston tips of the hydraulic jacks 32 and 33 with the support legs 34 and 35 abutting against the inner circumferences of the metal joints 6 and 7 of the existing pipe 2 to be crushed. The attached sharp members 36 and 37 are protruded outward in the radial direction so as to be crushed from the inside of the metal joints 6 and 7. Although this joint crushing apparatus 30 is not shown in the drawing, it may have a configuration in which hydraulic jacks are provided at all of a plurality of circumferentially spaced intervals, and is not particularly limited.

ドリル４０は、既設管２を拡径破砕するものであり、例えば図１０から図１２に示すように、円柱形の胴部４１と、この胴部４１の一端に設けられる円錐部４２と、円錐部４２の先端に設けられるロッド連結部４３とを有している。胴部４１の外径は、既設管２の内径および更新管２ａの外径より大きく設定されており、ロッド連結部４３の外径は、既設管２の内径より小さく設定されている。ロッド連結部４３は、円筒形に形成されているとともに、内周が雌ねじ孔になっており、ロッド１１の先端の雄ねじ部１１ａが螺合結合されるようになっている。胴部４１の他端には、更新管２ａを牽引するための連結部材５０が係止される連結部４４が設けられている。円錐部４２の円周数ヶ所には、ビットと呼ばれる先鋭な突起刃４５が設けられている。円錐部４２の円周数ヶ所と胴部４１の他端側の円周数ヶ所とには、流動性の滑材を吐出する噴射孔４６ａ，４６ｂが設けられている。この滑材は、水、あるいは水に泥やベントナイトと呼ばれる成分を添加したもの等が好適に用いられる。   The drill 40 is for expanding and crushing the existing pipe 2, for example, as shown in FIGS. 10 to 12, a cylindrical body 41, a conical part 42 provided at one end of the body 41, and a cone And a rod connecting portion 43 provided at the tip of the portion 42. The outer diameter of the trunk portion 41 is set larger than the inner diameter of the existing pipe 2 and the outer diameter of the update pipe 2 a, and the outer diameter of the rod connecting portion 43 is set smaller than the inner diameter of the existing pipe 2. The rod connecting portion 43 is formed in a cylindrical shape, and has an inner periphery formed as a female screw hole, and the male screw portion 11a at the tip of the rod 11 is screwed and coupled. At the other end of the body portion 41, a connecting portion 44 is provided on which a connecting member 50 for pulling the update pipe 2a is locked. At several places on the circumference of the conical portion 42, sharp projecting blades 45 called bits are provided. Injecting holes 46a and 46b for discharging a fluid lubricant are provided in several places on the circumference of the conical part 42 and several places on the other end of the body part 41. As this lubricant, water or a material obtained by adding a component called mud or bentonite to water is preferably used.

このドリル４０は、堀削装置１０に接続される滑材タンク６０内の滑材が、ロッド１１の中心に設けられる通路１１ｂを経て導入される。このドリル４０は、その中心部分にロッド１１の中心通路１１ｂに連通連結される導入路４０ａが設けられており、この導入路４０ａはそれぞれ放射方向に延びる流路４０ｂ，４０ｃを介して各噴射孔４６ａ，４６ｂに連通連結されている。   In this drill 40, the lubricant in the lubricant tank 60 connected to the excavation apparatus 10 is introduced through a passage 11 b provided at the center of the rod 11. The drill 40 is provided with an introduction passage 40a connected to the central passage 11b of the rod 11 at the center thereof. The introduction passage 40a is connected to each injection hole through passages 40b and 40c extending in the radial direction. 46a and 46b are connected in communication.

具体的に、この実施形態における入れ替え工法は、既設管２における金属製継手６，７の存在位置を認識する準備工程と、認識した金属製継手６，７をその内側から破砕する破砕工程と、既設管２における非金属製管３〜５をその内側から管軸方向一方へ破砕しながら、その破砕方向上流側から前記既設管２の破砕跡に更新管２ａを配置する更新工程とを含む。   Specifically, the replacement method in this embodiment includes a preparation step for recognizing the existence positions of the metal joints 6 and 7 in the existing pipe 2, a crushing step for crushing the recognized metal joints 6 and 7 from the inside, An updating step of disposing the renewal pipe 2a on the crushing trace of the existing pipe 2 from the upstream side in the crushing direction while crushing the non-metallic pipes 3 to 5 in the existing pipe 2 from the inside to one side in the pipe axis direction.

以下、各工程を詳細に説明する。   Hereinafter, each process will be described in detail.

(準備工程）
図１に示すように、土壌１の適宜場所に堀削装置１０により既設管２に通ずる発進坑８と到達坑９とを設ける。なお、発進坑８は、ロッド１１を挿入する側の立坑という意で用いており、また、到達坑９は、ロッド１１が到達する側の立坑という意で用いている。この実施形態では、発進坑８および到達坑９を比較的小さく形成している関係より、特に到達坑９側には、更新管２ａの導入をスムーズにするために、到達坑９の側壁部分から地表面に至る傾斜溝９ａを掘削している。 (Preparation process)
As shown in FIG. 1, a starting pit 8 and a reaching pit 9 that are connected to the existing pipe 2 by a excavation device 10 are provided at appropriate locations on the soil 1. The start shaft 8 is used as a shaft on the side where the rod 11 is inserted, and the arrival shaft 9 is used as a shaft on the side where the rod 11 reaches. In this embodiment, from the relationship in which the start pit 8 and the arrival pit 9 are formed relatively small, particularly on the arrival pit 9 side, in order to smoothly introduce the renewal pipe 2a, from the side wall portion of the arrival pit 9 An inclined groove 9a reaching the ground surface is excavated.

そして、図２に示すように、ロッド１１を堀削装置１０により螺旋回転させて送り出すことによって土壌１内を堀削しながら発進坑８の内部に挿入させる。この発進坑８に配置されたロッド１１の先端に金属探査装置２０を取り付けて、図３に示すように、この金属探査装置２０を発進坑８側から既設管２内に挿入して到達坑９側へ送ることにより、金属探査装置２０で金属製継手６，７を検出したうえで、当該検出地点の位置情報をオペレータが記録する。この検出地点は、金属探査装置２０の制御系（図示省略）に備える記憶部に自動的に記憶させるようにしてもよい。   Then, as shown in FIG. 2, the rod 11 is spirally rotated by the excavating device 10 and sent out to be inserted into the start pit 8 while excavating the soil 1. A metal exploration device 20 is attached to the tip of the rod 11 arranged in the start pit 8, and the metal exploration device 20 is inserted into the existing pipe 2 from the start pit 8 side as shown in FIG. By sending to the side, the metal exploration device 20 detects the metal joints 6 and 7 and then the position information of the detection point is recorded by the operator. You may make it memorize | store this detection point automatically in the memory | storage part with which the control system (illustration omitted) of the metal exploration apparatus 20 is equipped.

このようにしてから、ロッド１１の先端を発進坑８に引き戻し、その先端から金属探査装置２０を取り外す。   After this, the tip of the rod 11 is pulled back to the start shaft 8, and the metal exploration device 20 is removed from the tip.

（破砕工程）
図４に示すように、発進坑８側に位置するロッド１１の先端に継手破砕装置３０を取り付けてから、図５に示すように、この継手破砕装置３０を前記準備工程で記録した金属製継手６，７の存在位置に送って、継手破砕装置３０で金属製継手６，７を順次破砕する。 (Crushing process)
As shown in FIG. 4, after the joint crushing device 30 is attached to the tip of the rod 11 located on the start pit 8 side, as shown in FIG. 5, this joint crushing device 30 is recorded in the preparation step. The metal joints 6 and 7 are sequentially crushed by the joint crushing device 30.

このようにして、図７に示すように、ロッド１１をその先端に取り付けてある継手破砕装置３０を到達坑９に突出させるまで送り、継手破砕装置３０をロッド１１から取り外す。   In this way, as shown in FIG. 7, the joint crushing device 30 attached to the tip of the rod 11 is fed until it protrudes into the access shaft 9, and the joint crushing device 30 is removed from the rod 11.

（更新工程）
図８に示すように、到達坑９に存在するロッド１１の先端にドリル４０を取り付ける。このとき、ロッド１１の先端の雄ねじ部１１ａをドリル４０のロッド連結部４３の雌ねじ孔内に螺合することによって取り付ける。さらに、このドリル４０の胴部４１の他端側の連結部４４に連結部材５０を介して更新管２ａを取り付ける。 (Update process)
As shown in FIG. 8, a drill 40 is attached to the tip of the rod 11 existing in the access shaft 9. At this time, the male screw portion 11 a at the tip of the rod 11 is attached by being screwed into the female screw hole of the rod connecting portion 43 of the drill 40. Further, the renewal tube 2 a is attached to the connecting portion 44 on the other end side of the body portion 41 of the drill 40 via the connecting member 50.

このようにしてから、図９および図１０に示すように、ロッド１１を発進坑８側に引き戻すことによりドリル４０で既設管２における非金属製管３〜５を順次その内側から拡径破砕しながら、この既設管２の破砕跡に更新管２ａを配置することを行う。   Then, as shown in FIG. 9 and FIG. 10, the rod 11 is pulled back to the start pit 8 side, so that the non-metallic pipes 3 to 5 in the existing pipe 2 are sequentially expanded and crushed from the inside by the drill 40. However, the renewal pipe 2a is arranged on the crushing trace of the existing pipe 2.

このロッド１１の引き戻し時には、ロッド１１が螺旋回転しているので、ドリル４０が回転することになって、この回転するドリル４０の突起刃４５によって非金属製管３〜５が拡径されつつ破砕されることになる。   When the rod 11 is pulled back, since the rod 11 is spirally rotated, the drill 40 is rotated, and the non-metallic pipes 3 to 5 are crushed while the diameter of the nonmetallic pipes 3 to 5 is increased by the protruding blade 45 of the rotating drill 40. Will be.

しかも、ドリル４０を引き戻す過程では、円錐部４２に設けてある複数個の噴射孔４６ａと胴部４１の後端に設けてある複数個の噴射孔４６ｂとから流動性の滑材を略連続的に噴射させるようにしている。この場合、ドリル４０の円錐部４２の噴射孔４６ａから噴射される滑材は、ドリル４０の進行に伴いドリル４０と既設管２との間に流れるので、ドリル４０の進行時の抵抗を軽減するとともに、既設管２の破砕残骸からその外径側の土壌１内にしみ込んで地盤を緩やかにし、結果的に既設管２の破砕残骸をドリル４０の外径側へ押しのけやすくなる。また、ドリル４０の胴部４１の後端の噴射孔４６ｂから噴射される
滑材は、ドリル４０の進行に伴い既設管２の破砕残骸と更新管２ａとの間に流れて既設管２の破砕残骸からその外径側の土壌１内にしみ込んで地盤を緩やかにするので、更新管２ａが既設管２の破砕残骸をドリル４０の外径側へ押しのけやすくなるとともに、更新管２ａの進行時の抵抗が軽減される。 Moreover, in the process of pulling back the drill 40, the fluid lubricant is substantially continuously formed from the plurality of injection holes 46a provided in the conical portion 42 and the plurality of injection holes 46b provided in the rear end of the body portion 41. To be injected. In this case, since the lubricant injected from the injection hole 46a of the conical portion 42 of the drill 40 flows between the drill 40 and the existing pipe 2 as the drill 40 advances, resistance when the drill 40 advances is reduced. At the same time, the ground from the crushed debris of the existing pipe 2 is soaked into the soil 1 on the outer diameter side to loosen the ground, and as a result, the crushed debris of the existing pipe 2 is easily pushed to the outer diameter side of the drill 40. Further, the lubricant sprayed from the injection hole 46b at the rear end of the body portion 41 of the drill 40 flows between the crushing debris of the existing pipe 2 and the renewal pipe 2a as the drill 40 proceeds, and crushes the existing pipe 2. Since the soil penetrates into the soil 1 on the outer diameter side from the debris and loosens the ground, the renewal pipe 2a makes it easier to push the crushed debris of the existing pipe 2 toward the outer diameter side of the drill 40, and the renewal pipe 2a Resistance is reduced.

このようにすれば、図１３に示すように、土壌１内に埋設されていた既設管２を更新管２ａに入れ替えることができる。   If it does in this way, as shown in FIG. 13, the existing pipe | tube 2 embed | buried in the soil 1 can be replaced with the update pipe | tube 2a.

以上説明したように、土壌１に発進坑８および到達坑９を堀削するだけで、後は土壌１内の既設管２を破砕して土壌１内に残存させた状態で、更新管２ａを設置している。   As explained above, the excavation pipe 8a is simply excavated in the soil 1 and the existing pipe 2 in the soil 1 is crushed and left in the soil 1 after that. It is installed.

特に、準備工程ではロッド１１の送り操作を行うだけで金属製継手６，７の存在位置を認識するようにしており、また破砕工程ではロッド１１の送り操作と同時に継手破砕装置３０の遠隔操作を行うことで金属製継手６，７を破砕するようにしており、さらに更新工程ではロッド１１の送り操作を行うだけで非金属製管３〜５の破砕と更新管２ａの設置とを同時に行うようにしている。   In particular, in the preparation step, the presence position of the metal joints 6 and 7 is recognized only by performing the feeding operation of the rod 11, and in the crushing step, the remote operation of the joint crushing device 30 is performed simultaneously with the feeding operation of the rod 11. By doing so, the metal joints 6 and 7 are crushed. Further, in the renewal process, the non-metallic pipes 3 to 5 are crushed and the renewal pipe 2a is installed at the same time only by feeding the rod 11. I have to.

したがって、地中に埋設されているとともに複数の非金属製管３〜５を金属製継手６，７で接続してなる複合構成の既設管２について、それと同様の更新管２ａに入れ替える作業を、簡単かつ迅速に行うことができる。特に、更新工程において、ドリル４０の進行に伴いその進行方向下流側と上流側とから滑材を吐出させるようにしているから、既設管２の破砕と更新管２ａの設置とを円滑かつ迅速に行うことができ、更新作業がスムーズに行えるようになる。   Therefore, for the existing pipe 2 having a composite structure in which a plurality of non-metallic pipes 3 to 5 are connected by metal joints 6 and 7 and buried in the ground, the work of replacing the same update pipe 2a is performed. It can be done easily and quickly. In particular, in the renewal process, as the drill 40 proceeds, the lubricant is discharged from the downstream side and the upstream side in the traveling direction, so that the existing pipe 2 can be crushed and the renewal pipe 2a can be installed smoothly and quickly. It is possible to perform the update work smoothly.

このように、土壌１を掘削して既設管２を取り出してから、更新管２ａを設置するような古典的な工法に比べて、入れ替え作業が簡単かつ迅速に行えるので、入れ替えに要する時間と労力が軽減される等、入れ替えコストを低減するうえで有利となる。   Thus, since excavation of the soil 1 and the existing pipe 2 is taken out, the replacement work can be performed easily and quickly compared to the classic method of installing the renewal pipe 2a. This is advantageous in reducing the replacement cost.

以下、本発明の他の実施形態を説明する。   Hereinafter, other embodiments of the present invention will be described.

（１）上記入れ替え工法において、準備工程から破砕工程への移行を次のようにしてもよい。つまり、図示していないが、準備工程にて発進坑８側に到達したロッド１１を到達坑９に引き戻さずに、この発進坑８に位置しているロッド１１の先端から金属探査装置２０を取り外して、代わりに継手破砕装置３０を取り付ける。こうしてから、ロッド１１を到達坑９側に牽引することにより前記準備工程で認識した金属製継手６，７の存在位置に順次送って当該金属製継手６，７を順次破砕する。このようにした場合、準備工程の探査動作で送ったロッド１１を引き戻す過程で破砕工程を行えるから、ロッド１１の送り戻しに関連する無駄な動作を省けるようになり、入れ替え作業を効率よく迅速に行えるようになる。   (1) In the above replacement method, the transition from the preparation step to the crushing step may be performed as follows. That is, although not shown in the drawing, the metal exploration device 20 is removed from the tip of the rod 11 located in the start pit 8 without pulling the rod 11 that has reached the start pit 8 side in the preparation step back to the arrival pit 9. Instead, the joint crushing device 30 is attached. Then, by pulling the rod 11 to the arrival shaft 9 side, the metal joints 6 and 7 are sequentially sent to the existing positions of the metal joints 6 and 7 recognized in the preparation step, and the metal joints 6 and 7 are sequentially crushed. In this case, since the crushing process can be performed in the process of pulling back the rod 11 sent in the exploration operation in the preparation process, it is possible to omit a useless operation related to the feeding back of the rod 11, and the replacement work can be performed quickly and efficiently. You can do it.

（２）上記入れ替え工法において、破砕工程と更新工程とを同時に行うようにすることができる。つまり、図示していないが、例えば準備工程で金属製継手６，７の存在位置を認識して、金属探査装置２０を取り付けているロッド１１が発進坑８側に到達した状態において、この発進坑８に到達したロッド１１を到達坑９に引き戻さずに、この発進坑８に位置しているロッド１１の先端から金属探査装置２０を取り外して、このロッド１１の先端に、継手破砕装置３０とドリル４０と更新管２ａとをこの順番に取り付ける。こうしてから、ロッド１１を到達坑９側に堀削装置１０で牽引することにより前記準備工程で認識した金属製継手６，７と非金属製管３ａ〜３ｃを順次破砕しながら、その破砕跡に更新管２ａを設置する。このようにした場合、準備工程の探査動作で送ったロッド１１を引き戻す過程で破砕工程と更新工程とを同時に行えるから、ロッド１１の送り戻しに関連する無
駄な動作を省けるようになり、入れ替え作業をさらに効率よく迅速に行えるようになる。 (2) In the above replacement method, the crushing step and the updating step can be performed simultaneously. In other words, although not shown, for example, in the preparation process, in the state where the presence position of the metal joints 6 and 7 is recognized and the rod 11 to which the metal exploration device 20 is attached has reached the start shaft 8 side, this start shaft The metal exploration device 20 is removed from the tip of the rod 11 located at the starting pit 8 without pulling the rod 11 that has reached 8 to the arrival shaft 9, and a joint crushing device 30 and a drill are attached to the tip of the rod 11. 40 and the update pipe 2a are attached in this order. Then, the metal joints 6 and 7 and the non-metallic pipes 3a to 3c recognized in the preparation process are sequentially crushed by pulling the rod 11 to the arrival mine 9 side with the excavating device 10, and the crushing trace is obtained. The update pipe 2a is installed. In this case, since the crushing step and the updating step can be performed at the same time in the process of pulling back the rod 11 sent by the exploration operation in the preparation step, it is possible to omit a useless operation related to the feed back of the rod 11, and the replacement work. Can be performed more efficiently and quickly.

（３）上記実施形態において、ドリル４０の胴部４１の後端と円錐部４２とにそれぞれ噴射孔４６ａ，４６ｂを設けた例を挙げているが、これらの噴射孔４６ａ，４６ｂがないものや、いずれか一方側の噴射孔４６ａ（４６ｂ）のみを備えるものであってもよい。   (3) In the above embodiment, the example in which the injection holes 46a and 46b are provided in the rear end of the body part 41 and the conical part 42 of the drill 40, respectively, is given. , Only one of the injection holes 46a (46b) may be provided.

本発明に係る既設管の入れ替え工法の一実施形態で、準備工程の初期段階を示す説明図である。It is explanatory drawing which shows the initial stage of a preparation process by one Embodiment of the replacement construction method of the existing pipe which concerns on this invention. 図１の続きを示す説明図である。It is explanatory drawing which shows the continuation of FIG. 図２の続きを示す説明図である。FIG. 3 is an explanatory diagram showing a continuation of FIG. 2. 図３に続く破砕工程の初期段階を示す説明図である。It is explanatory drawing which shows the initial stage of the crushing process following FIG. 図４の続きを示す説明図である。It is explanatory drawing which shows the continuation of FIG. 図５の（６）−（６）線断面を拡大して示す矢視図である。FIG. 6 is an arrow view showing an enlarged cross section taken along line (6)-(6) in FIG. 5. 図５の続きを示す説明図である。It is explanatory drawing which shows the continuation of FIG. 図７に続く更新工程の初期段階を示す説明図である。It is explanatory drawing which shows the initial stage of the update process following FIG. 図８の続きを示す説明図である。It is explanatory drawing which shows the continuation of FIG. 図９のドリルで破砕している様子を示す説明図である。It is explanatory drawing which shows a mode that it is crushing with the drill of FIG. 図１０のドリルを先端側から見た斜視図である。It is the perspective view which looked at the drill of FIG. 10 from the front end side. 図１１のドリルを後端側から見た斜視図である。It is the perspective view which looked at the drill of FIG. 11 from the rear end side. 交換完了した状態を示す説明図である。It is explanatory drawing which shows the state which replacement | exchange completed.

符号の説明Explanation of symbols

１ 土壌
２ 既設管
３〜５ 既設管の非金属製管
６，７ 既設管の金属製継手
２ａ 更新管
３ａ〜５ａ 更新管の非金属製管
６ａ，７ａ 更新管の金属製継手
８ 発進坑
９ 到達坑
１０ 堀削装置
１１ ロッド
２０ 金属探査装置
３０ 継手破砕装置
４０ ドリル

1 soil
2 Existing pipe 3-5 Non-metallic pipe of existing pipe 6,7 Metal fitting of existing pipe
2a Renewal pipe 3a to 5a Non-metallic pipe for renewal pipe 6a, 7a Metal fitting for renewal pipe
8 Start pit
9 arrival pit 10 excavation device 11 rod 20 metal exploration device 30 joint crushing device 40 drill

Claims (5)

地中に埋設されているとともに複数の非金属製管を金属製継手で接続してなる既設管を更新管に入れ替える工法であって、
既設管における金属製継手の存在位置を認識する準備工程と、
前記認識した金属製継手をその内側から破砕する破砕工程と、
前記非金属製管をその内側から管軸方向一方へ破砕しながら、その破砕方向上流側から前記既設管の破砕跡に更新管を配置する更新工程とを含むことを特徴とする既設管の入れ替え工法。 It is a construction method that replaces an existing pipe that is buried in the ground and is formed by connecting a plurality of non-metallic pipes with metal joints, with an update pipe,
A preparation process for recognizing the position of a metal joint in an existing pipe;
Crushing step of crushing the recognized metal joint from the inside;
Replacing the existing pipe, including an updating step of arranging an update pipe on the crushing mark of the existing pipe from the upstream side in the crushing direction while crushing the non-metallic pipe from the inside to one side in the pipe axis direction Construction method. 請求項１に記載の既設管の入れ替え工法において、
前記準備工程は、前記既設管に通ずる二つの立坑を設け、先端に金属探査装置を取り付けたロッドを前記一方立坑側から既設管内に挿入して他方立坑側へ送ることにより前記金属探査装置で金属製継手を検出したうえで、当該検出位置を記録するものであることを特徴とする既設管の入れ替え工法。 In the method of replacing an existing pipe according to claim 1,
In the preparation step, two shafts communicating with the existing pipe are provided, and a metal rod with a metal exploration device attached to the tip is inserted into the existing pipe from the one shaft side and sent to the other shaft side to send a metal A method for replacing an existing pipe, wherein the detected position is recorded after detecting the joint made. 請求項１または２に記載の既設管の入れ替え工法において、
前記破砕工程は、ロッドの先端に継手破砕装置を取り付け、この継手破砕装置を前記準備工程で記録した金属製継手の存在位置に送って、当該金属製継手を破砕するものであることを特徴とする既設管の入れ替え工法。 In the construction method for replacing an existing pipe according to claim 1 or 2,
The crushing step is characterized in that a joint crushing device is attached to the tip of the rod, and the joint crushing device is sent to the position where the metal joint recorded in the preparation step is present to crush the metal joint. Replacement method for existing pipes. 請求項２に記載の既設管の入れ替え工法において、
前記破砕工程は、前記他方立坑側に到達した前記ロッドの先端から金属探査装置を取り外して、代わりに継手破砕装置を取り付け、前記ロッドを前記一方立坑側に牽引することにより前記準備工程で記録した金属製継手の存在位置に送って当該金属製継手を破砕するものであることを特徴とする既設管の入れ替え工法。 In the replacement method of the existing pipe according to claim 2,
The crushing step was recorded in the preparatory step by removing the metal exploration device from the tip of the rod that reached the other shaft side, attaching a joint crushing device instead, and pulling the rod to the one shaft side A method for replacing an existing pipe, characterized in that the pipe is sent to the position where the metal joint is present to crush the metal joint. 請求項１または２に記載の既設管の入れ替え工法において、
前記更新工程は、前記ロッドの先端を前記一方立坑側から挿入して他方立坑側に突出させて、このロッドの先端にドリルの先端側を取り付けるとともに、このドリルの後端側に更新管を取り付け、このロッドを前記一方立坑側に引き戻すことにより前記ドリルで前記既設管の非金属製管をその内側から拡径破砕しながら、当該既設管の破砕跡に更新管を配置するものであることを特徴とする既設管の入れ替え工法。

In the construction method for replacing an existing pipe according to claim 1 or 2,
In the updating step, the tip of the rod is inserted from the one shaft side and protrudes to the other shaft side, and the tip end side of the drill is attached to the tip end of the rod, and the update tube is attached to the rear end side of the drill The renewal pipe is arranged at the crushing mark of the existing pipe while the non-metallic pipe of the existing pipe is expanded and crushed from the inside by the drill by pulling the rod back to the one shaft side. A replacement method for existing pipes.

JP2004325723A 2004-11-09 2004-11-09 Replacement method for existing pipes Active JP4429875B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011026769A (en) * 2009-07-21 2011-02-10 Sanwa Kizai Co Ltd Existing buried pipe renovating apparatus and renovating method
JP2012060746A (en) * 2010-09-07 2012-03-22 Tokyo Electric Power Co Inc:The Pipe line breakup device and method of connecting distribution line
JP2014040903A (en) * 2012-07-24 2014-03-06 Sekisui Chem Co Ltd Replacement method of existent pipe

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101186482B1 (en) 2012-06-26 2012-09-27 (합)장흥건설 Trenchless replacing method for underground pipe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011026769A (en) * 2009-07-21 2011-02-10 Sanwa Kizai Co Ltd Existing buried pipe renovating apparatus and renovating method
JP2012060746A (en) * 2010-09-07 2012-03-22 Tokyo Electric Power Co Inc:The Pipe line breakup device and method of connecting distribution line
JP2014040903A (en) * 2012-07-24 2014-03-06 Sekisui Chem Co Ltd Replacement method of existent pipe

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