JP2004190463A - Method and device for replacing existing water supply lead pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an invention which relates to a non-cut-and-cover method and its device to remove an unnecessary lead pipe even with a low tensile strength without leaving any piece under the ground and to replace with a new pipe. <P>SOLUTION: A lead pipe correcting member 7 is passed through from one end 1b toward the other end 1c of an existing underground lead pipe 1 cut from a water supply piping 2 so as to correct a deformation of the existing underground lead pipe 1 into a complete circle. A tow cable 8 with intermediate supporting member 15, 16 fixed is connected to a tip of the lead pipe correcting member 7, and the lead pipe correcting member 7 is pulled out from the existing lead pipe 1 while simultaneously the tow cable 8 is passed through the existing pipe, a tip end of the drawn tow cable 8 is engaged with the end 1b of the existing lead pipe 1 and is connected also to a new pipe 10 by means of a connecting member. Then, by drawing the tow cable 8 toward the other end 1c of the existing lead pipe 1, the existing pipe 1 is pulled out and also the new pipe 1 is pulled into the same place where the existing lead pipe was laid, so that the new pipe 10 is connected to the water supply piping. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

鉛管内壁に突き刺さる形で牽引力を既設鉛管に伝達する爪形中間支持部材と、図７（ｂ）に示すように本体を牽引索に固着し既設鉛管内に挿通した後、それと反対

られ、鉛管内壁に遠心方向荷重が作用して摩擦部材と鉛管内壁の圧着度が高まると共に摩擦抵抗力が増大し牽引力を既設鉛管に伝達する摩擦形中間支持部材からなる既設鉛管の引き抜き装置。
【００１１】
従って、この発明によれば地中に埋設された鉛管は中間支持部材を固着した牽引索により地中に遺留物を残地させることなく全て引き抜かれて、環境基準上の問題は解決される。また管内に挿通した牽引索は、その管路に沿って容易にに曲折するので曲折した管路であっても引き抜くことができる。
【００１２】
【発明の実施の形態】
次に、本発明の実施の形態を実施例にもとずき図面を参照して説明する。
図１は本発明の実施概要図である。図２〜図５は敷設替え方法の工程を示すものであり図６〜図８は中間支持部材の形状を示すものである。
【００１３】
図２において、１は地中に埋設された鉛管を示す。この鉛管１は例えば配水本管２の分水栓３と各末端供給先の止水栓４との間に配管された給水管で図示例の場合、中間部に屈曲部（１ａ）が設けられている。
【００１４】
そしてこの鉛管１は敷設替えにあたり分水栓３と止水栓４とで完全に切り放されている。なお図中５は分水栓との切り放し部に掘削した作業立坑で、６は止水栓との切り放し部に設けたピットを示す。
【００１５】
最初に図２のように切り放した既設鉛管の歪みや変形を矯正するため矯正部材７を既設鉛管内に回転させながら挿入し鉛管を真円に近くなるよう矯正する。矯正部材７の先端にはネジ山がある弾丸状の鉛管拡張部材がついている。
【００１６】
矯正部材７が貫通したら図３のように該矯正部材７の先端から鉛管拡張部材７ａを取り外し中間支持部材１５、１６を固着した牽引索８を連結し矯正部材７を既設鉛管１から引き抜くと共に牽引索８を該既設鉛管内に挿通させる。
【００１７】
つぎに図４に示すように挿通された牽引索８は既設鉛管１の一端１ｂに取付具１７を以て係合させ、更に連結部材９を以て新規管１０とも連結する。
【００１８】
その後、図５に示すように牽引索８をサポート１１付きのクレーンフックなどで捲上げ牽引することにより既設鉛管１を地中から立坑５の方向に引き抜くと共に新規管１０を既設鉛管１が埋設されていた箇所と同箇所に引き込み敷設する。
【００１９】
そして引き込まれた新設管１０の管内洗浄を行った後、両端をそれぞれ分水栓３と止水栓４に接続し新設管１０の敷設を終了する。
【００２０】
ここで使用する牽引索は曲折する細い管路内でも挿通可能なように、細くても屈曲性と硬度を有する材質とされ、十分な引っ張り強度も有する鋼製ワイヤーや高抗張力を有する合成樹脂繊維製ロープなどが使用される。
【００２１】
また中間支持部材には図６のように爪形部材が鉛管内壁に突き刺さる形で牽引力を鉛管に伝達する爪形中間支持部材と、図７（ｂ）のように摩擦部材が鉛管内壁を遠心方向に押し広げて摩擦力を増大させ牽引力を鉛管に伝達する摩擦形中間支持部材とがある。
【００２２】
爪形中間支持部材は、図６のように牽引索８にナット１５ｄの締めつけにより固着された本体１５ａと、板バネ１５ｃにより本体１５ａに取り付けられた爪形

設鉛管に伝達することにより引き抜く装置である。
【００２３】
摩擦中間支持部材は図７のように牽引索８にナット１６ｃの締めつけにより固着した本体１６ａと、板バネ１６ｄなどの突張り材を取り付けた摩擦部材１６ｂによって構成されており摩擦部材１６ｂは本体１６ａに添ってスライド可

さるように抵抗する為、摩擦部材１６ｂは本体１６ａによって遠心方向に押し広げられ、鉛管内壁にも遠心方向荷重が作用して摩擦部材１６ｂと鉛管内壁の圧着度が高まると共に摩擦抵抗力が増大し牽引力を既設鉛管に伝達することにより引き抜く装置である。
【００２４】
以上説明したように鉛管１のような細い管であっても鉛管１内に挿通した中間支持部材１５、１６を固着した牽引索８を牽引することで管を引き抜くことができ、またポリエチレン管など曲折性の大きな新規管を連結することで既設埋設管と新規管を同時に敷設替えする事ができる。
【００２５】
【発明の効果】
本発明は、以上説明したように小口径埋設管の敷設替えであっても、地表を開削する事なく管路の両端に立坑を掘削するだけで実施でき交通障害や騒音公害を減らし、また労力や時間、経費も削減すると共に鉛管を地中から完全に引き抜くことにより環境基準上の問題も解決されるという効果がある。
【図面の簡単な説明】
【図１】本発明の概要を示す縦断面図である。
【図２】本発明の初期工程である既設埋設鉛管の矯正を示す縦断面図である。
【図３】既設鉛管の一端から他端へ向けて牽引索を挿通する工程を示す縦断面図である
【図４】既設鉛管の内部に牽引索を挿通し新規管との連結を示す縦断面図である。
【図５】牽引索を捲き上げる工程を示す縦断面図である。
【図６】爪形中間支持部材の実施例を示すもので（ａ）はその要部を示す縦断面図であり（ｂ）は（ａ）のＡ−Ａ線断面図である。
【図７】摩擦形中間支持部材の実施例を示すもので、（ａ）は挿通実施例を示す縦断面図であり、（ｂ）は牽引実施例を示す縦断面図である。
【図８】摩擦形中間支持部材の詳細を示すもので、（ａ）はその本体の縦断面図であり、（ｂ）は（ａ）のＡ−Ａ線断面図で、（ｃ）は（ａ）のＢ−Ｂ線断面図である。また（ｄ）は摩擦部材を示す平面図であり、（ｅ）は（ｄ）のＣ−Ｃ線断面図で、（ｆ）は（ｄ）のＤ−Ｄ線断面図である。
【符号の説明】
１ 地中の埋設鉛管
２ 配水本管
３ 分水栓
４ 止水栓
５ 作業立坑
６ ピット
７ 既設鉛管矯正部材
８ 牽引索
９ 連結部材
１０ 新規管
１１ クレーンなどの滑車付きサポート
１２ 牽引索引部材
１３ 捲上げフック
１４ 鉛管分離カッター
１５ 爪形中間支持部材
１６ 摩擦形中間支持部材
１７ 取付具[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for replacing the existing water supply lead pipe.
[0002]
[Prior art]
Conventionally, lead pipes have been generally used as water supply pipes. However, in recent years, detoxification of lead components has become a problem in environmental standards, and the necessity of replacement is increasing.
[0003]
For such replacement, an open-cutting method of excavating the entire existing buried pipe has been generally used, but a non-cutting method has also been proposed as a prior art.
[0004]
As a conventional non-cutting method, there is a method in which a core wire and a heating medium are inserted into an unnecessary buried plumbing pipe to melt the pipe body so as to be integrated with the core wire and pulled out (for example, see Patent Document 1). Also, insert the towing line into the existing plumbing tube, pull the towing line out from the other end by engaging the tip of the towing line with one end of the existing plumbing tube and pulling the towing line from the other end, and at the same time insert a new tube by propulsion method etc. (See, for example, Patent Document 2).
[0005]
[Patent Document 1]
JP-A-08-128566 (pages 1-3, FIG. 2)
[Patent Document 2]
JP-A-2002-097894 (pages 1-3, FIG. 5)
[0006]
[Problems to be solved by the invention]
However, the excavation method has various problems, such as being a source of traffic obstacles and noise pollution, and causing much labor, time, and expenses.
[0007]
The method of using a heating medium even in the non-cutting method has the problem of damaging weakly heated objects such as cables and vinyl chloride pipes buried next to each other. With the method of pulling out from the other end, there is a problem in that the engaged portion causes buckling in a lead tube having a small compressive strength, and it becomes impossible to pull.
[0008]
In view of the above problems, the present invention has been made to replace a plumbing pipe, such as a polyethylene pipe, with a highly bendable new pipe without excavating the ground surface and leaving a lead pipe, which may be a problem in environmental standards, underground. It is a thing.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the replacement of the present invention, first, through a plumbing straightening member from one end to the other end of the existing buried plumbing cut off from the water supply pipe, to correct the deformation of the existing plumbing to a perfect circle, A tow line to which an intermediate support member is fixed is connected to the end of the lead tube straightening member, the lead tube straightening member is pulled out of the existing lead tube, and the tow line is inserted into the existing lead tube at the same time. The lead tube was pulled out by pulling the tow line to the other end of the existing lead tube, and the new lead tube was laid on the existing lead tube. A method in which the existing pipe is connected to the new pipe and the water supply pipe, and the existing pipe is replaced.
[0010]
As shown in FIG. 6, the intermediate support member described above has

A claw-shaped intermediate support member that transmits the traction force to the existing lead pipe by piercing the inner wall of the lead pipe, and, as shown in FIG. 7 (b), the main body is fixed to the tow line and inserted into the existing lead pipe, and then opposite thereto.

And a centrifugal load acting on the inner wall of the lead pipe to increase the degree of compression between the friction member and the inner wall of the lead pipe, increase the frictional resistance, and transmit the traction force to the existing lead pipe.
[0011]
Therefore, according to the present invention, all the lead pipes buried in the ground are pulled out by the towing line to which the intermediate support member is fixed without leaving any remains in the ground, and the problem on environmental standards is solved. Further, the towing line inserted into the pipe can be easily bent along the pipe line, so that even the bent pipe line can be pulled out.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described based on examples with reference to the drawings.
FIG. 1 is a schematic diagram of the embodiment of the present invention. 2 to 5 show the steps of the laying method, and FIGS. 6 to 8 show the shapes of the intermediate support members.
[0013]
In FIG. 2, reference numeral 1 denotes a lead pipe buried underground. The lead pipe 1 is, for example, a water supply pipe provided between the water tap 3 of the water distribution main pipe 2 and the water stopcock 4 at each end supply destination. In the illustrated example, a bent portion (1a) is provided at an intermediate portion. ing.
[0014]
The plumbing pipe 1 is completely cut off by the water faucet 3 and the water stopcock 4 when the pipe is replaced. In the figure, reference numeral 5 denotes a working shaft excavated at a portion separated from the water faucet, and reference numeral 6 denotes a pit provided at a portion separated from the water stopcock.
[0015]
First, the straightening member 7 is inserted into the existing lead pipe while rotating to correct the distortion or deformation of the cut-out existing lead pipe as shown in FIG. The tip of the correction member 7 is provided with a bullet-shaped lead pipe expansion member having a thread.
[0016]
When the straightening member 7 has penetrated, the lead pipe expanding member 7a is removed from the tip of the straightening member 7 as shown in FIG. 3, and the towing line 8 to which the intermediate support members 15 and 16 are fixed is connected to pull out the straightening member 7 from the existing lead pipe 1 and tow. The cable 8 is inserted through the existing lead pipe.
[0017]
Next, as shown in FIG. 4, the towing line 8 inserted is engaged with one end 1 b of the existing lead pipe 1 with a fitting 17, and further connected with a new pipe 10 with a connecting member 9.
[0018]
Thereafter, as shown in FIG. 5, the existing lead pipe 1 is pulled out from underground in the direction of the shaft 5 by pulling up the towing line 8 with a crane hook having a support 11 or the like, and a new pipe 10 is buried in the existing lead pipe 1. It is laid in the same place as the place where it was.
[0019]
Then, after the drawn-in new pipe 10 is washed in the pipe, both ends are connected to the water faucet 3 and the water stopcock 4, respectively, and the laying of the new pipe 10 is completed.
[0020]
The towline used here is made of a material that has flexibility and hardness even if it is thin, so that it can be inserted even into a narrow bent conduit, and a steel wire that has sufficient tensile strength or a synthetic resin fiber that has high tensile strength Rope and the like are used.
[0021]
Also, as shown in FIG. 6, a claw-shaped intermediate support member for transmitting a traction force to the plumb tube in such a manner that the claw member penetrates the inner wall of the plumb tube as shown in FIG. And a friction-type intermediate support member that increases the frictional force by transmitting the traction force to the plumbing tube.
[0022]
The claw-shaped intermediate support member includes a main body 15a fixed to the towing line 8 by tightening a nut 15d as shown in FIG. 6 and a claw-shaped intermediate support member attached to the main body 15a by a leaf spring 15c.

It is a device that pulls out by transmitting to a plumbing pipe.
[0023]
As shown in FIG. 7, the friction intermediate support member is composed of a main body 16a fixed to the towing line 8 by tightening a nut 16c and a friction member 16b to which a tension member such as a leaf spring 16d is attached. Can slide along

The friction member 16b is pushed and spread in the centrifugal direction by the main body 16a, so that the centrifugal load acts on the inner wall of the plumbing tube, so that the degree of crimping between the friction member 16b and the inner wall of the plumbing tube increases, and the frictional resistance increases. This is a device that pulls out by transmitting the traction force to an existing plumbing pipe.
[0024]
As described above, even a thin tube such as the lead tube 1 can be pulled out by towing the towing line 8 to which the intermediate support members 15 and 16 fixed to the lead tube 1 are inserted, and a polyethylene tube or the like. By connecting a new pipe with high flexibility, the existing buried pipe and the new pipe can be laid at the same time.
[0025]
【The invention's effect】
As described above, the present invention can replace a small-diameter buried pipe by simply excavating shafts at both ends of the pipe without excavating the ground surface. In addition, it is possible to reduce the time and cost, and to completely remove the lead pipe from the ground, thereby solving the problem of environmental standards.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an outline of the present invention.
FIG. 2 is a longitudinal sectional view showing a straightening of an existing buried plumbing which is an initial step of the present invention.
FIG. 3 is a longitudinal sectional view showing a process of inserting a tow line from one end of the existing lead tube to the other end. FIG. 4 is a longitudinal sectional view showing a connection between the existing lead tube and a new tube by inserting the tow line into the existing lead tube. FIG.
FIG. 5 is a longitudinal sectional view showing a step of hoisting a tow line.
6A and 6B show an embodiment of a claw-shaped intermediate support member, where FIG. 6A is a longitudinal sectional view showing a main part thereof, and FIG. 6B is a sectional view taken along line AA of FIG.
7A and 7B show an embodiment of a friction type intermediate support member, in which FIG. 7A is a longitudinal sectional view showing an insertion embodiment, and FIG. 7B is a longitudinal sectional view showing a towing embodiment.
8A and 8B show details of a friction type intermediate support member, in which FIG. 8A is a longitudinal sectional view of the main body, FIG. 8B is a sectional view taken along line AA of FIG. 8A, and FIG. It is BB sectional drawing of a). (D) is a plan view showing the friction member, (e) is a cross-sectional view taken along line CC of (d), and (f) is a cross-sectional view taken along line DD of (d).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Underground lead pipe 2 Water distribution main pipe 3 Distribution tap 4 Stopcock 5 Working shaft 6 Pit 7 Existing plumbing straightening member 8 Towing line 9 Connecting member 10 New pipe 11 Support with pulley such as crane 12 Towing index member 13 Winding Raising hook 14 Lead tube separation cutter 15 Claw-shaped intermediate support member 16 Friction-type intermediate support member 17 Fixture

Claims (2)

A lead tube straightening member is penetrated from one end to the other end of the existing buried plumbing tube cut off from the water supply pipe to correct the deformation of the existing plumbing tube to a perfect circle, and a towing cable having an intermediate support member fixed to the tip of the plumbing tube correcting member. At the same time, the lead pipe straightening member is pulled out from the existing lead pipe, and at the same time, the towing cable is inserted into the existing lead pipe, and the tip of the drawn towing cable is engaged with one end of the existing lead pipe. The existing lead pipe is pulled out by pulling the tow line to the other end side of the existing lead pipe while being connected to a pipe, and a new pipe is drawn in and laid at the same place where the existing lead pipe was laid, and the new pipe and the water supply pipe are laid. A method of connecting existing roads and replacing existing buried pipes. The intermediate support member according to claim 1 is a main body as shown in FIG.

A claw-shaped intermediate support member for transmitting a traction force to the existing lead pipe in a form in which the claw-shaped member pierces the inner wall of the lead pipe by towing, and a main body fixed to the tow line as shown in FIG.

The member is pushed out in the centrifugal direction by the main body, and a centrifugal load acts on the inner wall of the plumbing pipe, increasing the degree of compression between the friction member and the inner wall of the plumbing pipe, increasing the frictional resistance, and transmitting the traction force to the existing plumbing pipe. An existing lead pipe drawing device consisting of:

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