【0001】
【発明の属する技術分野】
本発明は既設給水用鉛管の敷設替え方法に関する。
【0002】
【従来の技術】
従来給水管として鉛管が一般的に使用されてきたが、近年鉛成分の有害化が環境基準上問題になっており敷設替えの必要性が高まっている。
【0003】
このような敷設替えに対しては一般的に既設埋設管上を全て掘削する開削工法がとられてきたが、非開削工法も先行技術として提案されている。
【0004】
従来の非開削工法には、不要となった埋設鉛管内に芯線材と加熱媒体を挿通し管体を溶融させる事により芯線材と一体化して引き抜く方法がある(例えば、特許文献1参照)。また既設鉛管内に牽引索を挿通し引き出した牽引索の先端を既設鉛管の一端に係合させ牽引索を他端から牽引することにより既設鉛管を引き抜き、同時に新規管を推進工法などにより挿入する方法などがある(例えば、特許文献2参照)。
【0005】
【特許文献1】
特開平08−128566号公報(第1−3頁、図2)
【特許文献2】
特開2002−097894号公報(第1−3頁、図5)
【0006】
【発明が解決する課題】
しかしながら開削工法は交通の障害や騒音公害の元となり、また多くの労力、時間、経費の費やす原因になるなど種々の問題がある。
【0007】
非開削工法でも加熱媒体を使用する方法は、隣接して埋設されているケーブルや塩化ビニル管など弱熱性の物体に損傷を与える問題があり、また牽引索と既設鉛管の一端だけ係合させて他端から引き抜く方法では、圧縮強度の小さい鉛管では係合させた部分が座屈を引き起こして牽引不能に陥る問題がある。
【0008】
本発明は、上記問題に鑑み地表を開削することなく、また環境基準上の問題となりえる鉛管を地中に残置させることなくポリエチレン管など曲折性の大きい新規管に敷設替えすることを課題としてなされたものである。
【0009】
【課題を解決するための手段】
上記目的を達成するために本発明の敷設替えは、まず給水管路から切り放した既設埋設鉛管の一端から他端へ向けて鉛管矯正部材を貫通させ前記既設鉛管の変形を真円に矯正し、鉛管矯正部材の先端に中間支持部材を固着した牽引索を連結し鉛管矯正部材を既設鉛管から引き抜くと同時に牽引索を該既設鉛管内に挿通し、引き出した牽引索の先端を既設鉛管の一端に係合させ、連結部材を以てポリエチレン管など曲折性の大きい新規管とも連結し前記牽引索を既設鉛管の他端側へ牽引することにより該既設鉛管を引き抜くと共に新規管を既設鉛管の敷設されていた箇所と同箇所に引き込み敷設、該新規管と前記給水管路を接続して既設埋設管を敷設替えする方法。
【0010】
上記に記載の中間支持部材とは、図6に示すように本体を牽引索に固着し既設
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
![Figure 2004190463](https://patentimages.storage.***apis.com/10/9b/7a/d1af9365f6869f/2004190463-9.png)
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.
![Figure 2004190463](https://patentimages.storage.***apis.com/10/9b/7a/d1af9365f6869f/2004190463-9.png)
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