JP2004011885A - Structure and method of shutting water in pipe opening of renewal pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the structure and a method of shutting water in a pipe opening of a renewal pipe which can obtain a sufficient compression ratio in a water expansion rubber easy to be deformed to simply and easily secure the certain water shut-off property near a pipe opening of a renewal pipe. <P>SOLUTION: As the structure for shutting water off in a pipe opening of the renewal pipe 1, which regenerates inside of an existing pipe 3, in relation to the existing pipe 3, a water shut-off material 4 formed from the water expansion rubber compressed to seal over the whole range in the circumferential direction at a nearly even thickness when enlarging diameter of the renewal pipe and to be deformed in the pipe axial direction is interposed between the pipe openings of both ends of the existing pipe and pipe openings in both ends of the renewal pipe. Preventing members 5 and 5 formed of an O-ring made of the soft vinyl chloride and for preventing deformation of the water expansion rubber in the pipe axial direction is provided in both ends of the pipe axial direction of this water shut-off material. <P>COPYRIGHT: (C)2004,JPO

Description

【００３２】
この表１に示すように、止水材４として水膨張ゴムを適用し、拘束部材を使用しない場合には、水膨張ゴムが経時的に既設管３両端の管口と更生管１両端の管口との間から経時的にはみ出すものの、水圧の圧力値が０．０１ＭＰａまで上昇することが確認できた。この場合、実際の既設管３と更生管１との間に加わる水圧の圧力値は０．０１ＭＰａにも満たないので、十分とはいえないものの止水性がある程度は確保されたものといえるので、評価は△となる。
【００３３】
また、止水材４として変性シリコンまたは無架橋ブチルゴムを適用し、拘束部材を使用しない場合には、水圧の圧力値が上昇する前に、既設管３両端の管口と更生管１両端の管口との間から水が漏れ出し、止水性が全く確保できないので、評価は共に×となる。
【００３４】
そして、止水材４として水膨張ゴムを適用し、硬質塩化ビニル製のＯリングよりなる拘束部材５を用いた場合には、水圧の圧力値が０．０３ＭＰａまで上昇すると、既設管３両端の管口と更生管１両端の管口との間から水が漏れ出すことが確認できたので、十分な止水性が確保できるものとみなし、評価は○となる。
【００３５】
更に、止水材４として水膨張ゴムを適用し、軟質塩化ビニル製のＯリングまたはＺ型パッキンよりなる拘束部材５を用いた場合には、水圧の圧力値が０．１ＭＰａまで上昇しても、既設管３両端の管口と更生管１両端の管口との間から水が漏れ出さないことが確認できたので、非常に高い止水性が確保できるものとみなし、評価は◎となる。
【００３６】
−実施形態の効果−
したがって、本実施形態では、既設管３の管口と更生管１の管口との間に介設された止水材４は、更生管１の拡径時に既設管３との間で略均一の厚さで周方向全域に亘ってシールするように止水材４の管軸方向両端の阻止部材５，５同士の間において管軸方向へ進行し易い変形（反応の進行）が拘束された状態で圧縮されて周方向でのほぼ均一の圧縮率が確保され、止水材４による十分な止水性能が発揮される上、軟質塩化ビニル製のＯリングよりなる阻止部材５自身の弾性変形による止水効果も発揮され、既設管３の管口と更生管１の管口との間での止水性をさらに効果的に向上させることができる。
【００３７】
しかも、止水材４およびその両端の阻止部材５，５は既設管３両端の管口と更生管１両端の管口との間に介設されているので、更生管の拡径後にエポキシ樹脂やモルタルなどを管口付近に充填させるもののように、施工後の工程が増したり、施工時間が増大したりすることがない。つまり、本実施形態では、更生管１の拡径前の既設管３両端の管口内周面にシール状の止水材４を略均一の厚さで周方向全域に亘って貼り付けるとともに、Ｏリングよりなる拘束部材５をそれぞれ貼り付けておくことで、更生管１を拡径すれば、既設管３両端の管口と更生管１両端の管口との間に略均一の厚さで周方向全域に亘ってシールする止水材４が簡単に介設されることになり、既設管３両端の管口と更生管１両端の管口との間に止水材４および拘束部材５を介設する際の施工時間を短縮しつつ簡単かつ容易に施工することができる。
【００３８】
また、止水材４として水膨張ゴムが用いられているので、老朽化した既設管３の管口付近において発生している崩落やひび割れに対して水膨張ゴムが変形して容易に追従し、既設管３の管口と更生管１の管口との間での止水性をより向上させることができる。
【００３９】
−その他の実施形態−
なお、本発明は、上記実施形態に限定されるものではなく、その他種々の変形例を包含している。例えば、上記実施形態では、水膨張ゴムをシート状に成形した止水材４を更生管１拡径前の既設管３の管口内周面に略均一の厚さで周方向全域に亘って貼り付けるとともに、その管軸方向両端にＯリングよりなる拘束部材５をそれぞれ貼り付けたが、水膨張ゴムをシート状に成形した止水材が更生管拡径前の更生管の管口外周面に略均一の厚さで周方向全域に亘って貼り付けるとともに、その管軸方向両端にＯリングよりなる拘束部材がそれぞれ貼り付けられていてもよい。この場合、止水材の表面側（既設管側）の面をペットフィルムにより覆っておいてもよい。
【００４０】
また、上記実施形態では、止水材４の管軸方向両端に軟質塩化ビニル製のＯリングよりなる阻止部材５，５を貼り付けたが、止水材の管軸方向両端に軟性の接着剤、軟質塩化ビニル製のＺ型パッキンまたは硬質塩化ビニル製のＯリングよりなる阻止部材（阻止手段）が適宜組み合わされて貼り付けられていてもよい。さらにまた、既設管の内周面および更生管の外周面のうちの少なくとも一方の阻止部材として、止水材の変形（水膨張ゴムの反応の進行による管軸方向への流出）を滞留により阻止する凹部（阻止手段）が適用されていてもよく、この場合には、既設管内への更生管の引き込み作業などを行う際に阻止部材が邪魔となることがなく、更生管の引き込み作業が円滑に行える上、阻止部材としてＯリングやＺ型パッキンなどを別途用意する必要がなくなって材料の低廉化を図ることも可能となる。
【００４１】
そして、上記実施形態では、水膨張ゴムよりなる止水材４を用いたが、更生管拡径時の圧縮などによって管軸方向に変形するモルタルなどの圧縮変形部材が適用されていてもよい。
【００４２】
【発明の効果】
以上のように、本発明では、既設管の管口と更生管の管口との間に介設した圧縮変形部材を、更生管の拡径時に既設管との間で略均一の厚さで周方向全域に亘ってシールするようにその管軸方向両端の阻止手段同士の間で管軸方向へ変形し易い変形を拘束した状態で圧縮することで、周方向でのほぼ均一の圧縮率を確保でき、既設管の管口と更生管の管口との間での止水性を十分に確保することができる。しかも、圧縮変形部材および阻止手段を設けるに当たって、施工後の工程が増したり、施工時間が増大したりすることがなく、施工時間を短縮しつつ簡単かつ容易に施工することができる。
【００４３】
また、更生管の拡径前の既設管の管口内周面または更生管の管口外周面にシール状の圧縮変形部材を略均一の厚さで周方向全域に亘って貼り付けるとともに、その管軸方向両端に阻止手段を設けておくことで、更生管を拡径すれば、既設管の管口と更生管の管口との間に略均一の厚さで周方向全域に亘ってシールする圧縮変形部材を阻止手段と共に簡単に介設でき、既設管の管口と更生管の管口との間での止水性を十分に確保できるのはもちろんのこと、施工時間を短縮しつつ簡単かつ容易に施工することもできる。
【００４４】
そして、圧縮変形部材として水膨張ゴムを適用することで、老朽化した既設管の管口付近において発生している崩落やひび割れに対し水膨張ゴムの変形により容易に追従し、既設管の管口と更生管の管口との間での止水性をより向上させることができる。
【００４５】
また、阻止手段としてリング状の弾性部材を適用することで、圧縮変形部材による止水性能に加えて、その管軸方向両端での弾性部材自身の弾性変形による止水効果も発揮でき、既設管の管口と更生管の管口との間での止水性をさらに効果的に向上させることができる。
【００４６】
これに対し、阻止手段として管軸方向へ変形する圧縮変形部材を滞留させる凹部を適用することで、既設管内への更生管の引き込み作業を円滑に行うことができるとともに、弾性部材などの阻止手段を不要にして材料の低廉化を図ることもできる。
【図面の簡単な説明】
【図１】本発明の実施形態に係る更生作業前の更生管を示す斜視図である。
【図２】更生管の製造工程を説明するための図である。
【図３】更生管を既設管の内部に引き込む更生管敷設工程を説明する図である。
【図４】（ａ）は更生管を拡径する前の状態での更生管の上流側マンホール側管口付近の断面図である。（ｂ）は更生管を拡径した状態での更生管の上流側マンホール側管口付近の断面図である。
【図５】（ａ）は埋設管内に更生管を引き込んだ状態を示す断面図である。
（ｂ）は更生管を加熱して形状回復させた状態を示す断面図である。
（ｃ）は更生管を加圧膨張させて埋設本管の内面に密着させた状態を示す断面図である。
【図６】更生管を既設管内にライニングするライニング工程を説明する図である。
【図７】水圧を加えて止水材の止水性を評価する実験を行う場合の既設管および更生管の概略断面図である。
【符号の説明】
１　　　　　　更生管
３　　　　　　既設管
４　　　　　　　　　　　　止水材（圧縮変形部材、弾性部材）
５　　　　　　阻止部材（阻止手段）[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a water stop structure and a water stop method for a rehabilitation pipe in which a rehabilitation pipe for rehabilitating the inside of an existing pipe is made to stop water from the existing pipe.
[0002]
[Prior art]
Generally, a material such as FRP, vinyl chloride, or polyethylene is applied as a rehabilitation pipe for rehabilitating an existing pipe. When rehabilitating existing pipes that have collapsed or cracked using such rehabilitation pipes, sufficient waterproofness is secured in the area covered by the newly installed rehabilitation pipe, that is, in the pipeline. Despite this, the problem of water stoppage near the mouth that comes in contact with manholes has been regarded as a problem.
[0003]
Therefore, before expanding the rehabilitation pipe by applying air pressure or the like to the existing pipe, that is, before bringing the rehabilitation pipe into close contact with the existing rehabilitation pipe, a compressive deformation member such as water-expandable rubber is filled in the vicinity of the pipe opening of the rehabilitation pipe. By expanding the diameter of the existing pipe, the gap between the opening of the existing pipe and the opening of the rehabilitation pipe is tightly sealed by a compression deformation member (water-swelling rubber).
[0004]
As another measure, after the rehabilitation pipe is expanded and adhered to the existing pipe, the area around the pipe port of the rehabilitation pipe is filled with a compressive deformation member such as epoxy resin or mortar, so that the rehabilitation pipe can be used. Some attempts have been made to ensure the water stoppage at the mouth of the pipe.
[0005]
[Problems to be solved by the invention]
By the way, as in the former case, in the case where the pipe mouth is stopped by a compressively deformable member such as a water-expandable rubber, the rehabilitating pipe is expanded in diameter to the existing pipe and brought into close contact with the existing pipe so as to react in the axial direction of the pipe. Deformation progresses, and the compression rate of the compression deformable member cannot be sufficiently obtained between the mouth of the rehabilitation pipe and the mouth of the existing pipe, and the water stoppage at the mouth of the rehabilitation pipe is insufficient. It becomes.
[0006]
On the other hand, in the case of filling the vicinity of the pipe opening with a compression deformable member such as epoxy resin or mortar after expanding the rehabilitating pipe as in the latter case, the number of steps after the construction increases, and the construction time naturally increases. Become.
[0007]
The present invention has been made in view of such a point, and an object of the present invention is to achieve a sufficient compression ratio even in a compressively deformable member in which deformation is apt to progress, thereby ensuring a reliable stop near the mouth of the rehabilitation pipe. It is an object of the present invention to provide a pipe mouth water stopping structure and a pipe mouth water stopping method of a rehabilitating pipe that can shorten the construction time while easily and easily securing water.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, as a rehabilitation pipe mouth water-stop structure in which a rehabilitation pipe port for rehabilitating an existing pipe is made to stop water from the existing pipe, the rehabilitation pipe port and the rehabilitation pipe are rehabilitated. A compression deformable member that is compressed so as to seal over the entire area in the circumferential direction with a substantially uniform thickness when the rehabilitating pipe is expanded and that deforms in the pipe axial direction is provided between the pipe opening and the pipe. At both ends in the tube axis direction of the compression deformation member, blocking means for preventing deformation of the compression deformation member in the tube axis direction are provided.
[0009]
According to this specific matter, the compressively deformed member interposed between the mouth of the existing pipe and the mouth of the rehabilitation pipe has a substantially uniform thickness between the existing pipe and the entire area in the circumferential direction when the rehabilitation pipe is expanded. Between the blocking means at both ends in the tube axis direction of the compression deformable member so as to seal over a state where the deformation which easily proceeds in the tube axis direction is restrained, and a substantially uniform compression ratio in the circumferential direction is obtained. Thus, the water stoppage between the mouth of the existing pipe and the mouth of the rehabilitation pipe is sufficiently ensured.
[0010]
In addition, since the compressive deformation member and the blocking means at both ends thereof are interposed between the pipe port of the existing pipe and the pipe port of the rehabilitation pipe, after the rehabilitation pipe is expanded, epoxy resin, mortar, or the like is placed near the pipe port. Unlike the case of filling, the number of steps after the construction does not increase and the construction time does not increase, and the construction can be performed easily and easily while shortening the construction time.
[0011]
In addition, the following configuration is cited as a method of stopping water from a rehabilitation pipe at a port of the rehabilitation pipe for rehabilitating the inside of the existing pipe.
[0012]
In other words, a seal-shaped compression-deformable member having a substantially uniform thickness is attached to the inner peripheral surface of the existing pipe opening or the outer peripheral surface of the opening of the rehabilitating pipe before the diameter expansion of the rehabilitating pipe over the entire area in the circumferential direction. Preventing means for preventing deformation of the compression deformable member in the tube axis direction are attached to both ends of the deformable member in the tube axis direction, and thereafter, the diameter of the rehabilitating tube is increased, so that the compression deformable member is moved in both ends in the tube axis direction. To seal between the mouth of the existing pipe and the mouth of the rehabilitation pipe.
[0013]
According to this specific matter, a seal-shaped compression-deformable member having a substantially uniform thickness is attached to the inner peripheral surface of the existing pipe opening or the outer peripheral surface of the opening of the rehabilitating pipe before the expansion of the rehabilitating pipe over the entire circumferential direction. By attaching blocking means to both ends of the compression deformable member in the pipe axis direction, if the diameter of the rehabilitation pipe is increased, a substantially uniform thickness is provided between the mouth of the existing pipe and the mouth of the rehabilitation pipe. The compression deforming member that seals over the entire circumferential direction is easily interposed in a state of being restrained by the blocking means, and the water stoppage between the mouth of the existing pipe and the mouth of the rehabilitation pipe is sufficient. As a matter of course, it is possible to easily and easily construct while shortening the construction time.
[0014]
In particular, when water-expandable rubber is used as the compressive deformation member, the water-expandable rubber deforms and easily follows collapses and cracks occurring near the mouth of the aging existing pipe. In addition, it is possible to further improve the water stoppage between the mouth of the existing pipe and the mouth of the rehabilitation pipe.
[0015]
In addition, when a ring-shaped elastic member that is compressed and deformed with the existing pipe when expanding the rehabilitating pipe is applied as the blocking means, in addition to the water stopping performance of the compressively deformable member, the pipe may be used. The water stopping effect due to the elastic deformation of the elastic member itself at both ends in the axial direction is also exerted, and the water stopping between the mouth of the existing pipe and the mouth of the rehabilitation pipe can be more effectively improved.
[0016]
On the other hand, in the case where a concave portion provided on at least one of the inner peripheral surface of the existing pipe and the outer peripheral surface of the rehabilitation pipe and retaining a compressively deformable member deforming in the pipe axis direction is applied as the blocking means. In addition, when the rehabilitating pipe is pulled into the existing pipe, the blocking means does not become a hindrance, and the rehabilitating pipe can be smoothly pulled in. In addition, there is no need to separately prepare an elastic member or the like as the blocking means, and the cost of the material can be reduced.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
[0018]
FIG. 1 shows a rehabilitation pipe used in a pipe mouth water stopping structure according to the present invention. The rehabilitation pipe 1 is made of a thermoplastic resin material such as vinyl chloride and has a recess 11 extending along a longitudinal direction on an outer surface thereof. Thus, it is formed into a fold-like shape in which the cross-sectional outer area is reduced. Further, the rehabilitation pipe 1 has a performance of recovering a shape into a cylindrical body by being heated to a predetermined shape recovery temperature (for example, 80 ° C.). In this case, the shape recovery temperature is a temperature at which the shape recovers to a cylindrical shape only by heating without applying an external force such as pressure.
[0019]
The method of manufacturing the rehabilitation pipe 1 is as follows. As shown in FIG. 2, first, a cylindrical body 10 of a thermoplastic resin material is extruded by an extruder 21, and the cylindrical body 10 is cooled by passing through a cooling water tank 22. The outer surface is crushed in an atmosphere at the recovery temperature to form a concave portion 11 extending along the longitudinal direction on the outer surface as shown in FIG. Thereafter, the cylindrical body 10 is pulled by the pulling device 24 so as to reduce the cross-sectional outer area, and the cylindrical body 10 is wound up on the drum 26 via the traverse portion 25.
[0020]
Until the rehabilitated pipe 1 manufactured in this way is carried into the rehabilitation site of the existing pipe, restraining means is used so that the pipe itself does not "restore its natural shape" under the influence of the outside air temperature. It is preferable to restrain using or store at low temperature.
[0021]
−Rehabilitation−
Next, the rehabilitation work of the existing pipe will be described.
[0022]
Here, as shown in FIG. 3, the existing pipe 3 embedded between the upstream manhole Q1 (the manhole located on the left side in FIG. 3) and the downstream manhole Q2 (the manhole located on the right side in FIG. 3). Will be described.
[0023]
The rehabilitation pipe 1 wound on the drum 26 is carried in on the ground near the upstream manhole Q1. On the other hand, a winch 51 is provided on the ground near the downstream manhole Q2. A guide portion 52 for guiding a wire 54 for pulling the rehabilitation pipe 1 is provided below the downstream manhole Q2. Prior to inserting the rehabilitating pipe 1 into the existing pipe 3, the inside of the existing pipe 3 is washed and protrusions are removed in advance.
[0024]
First, as shown in FIG. 4A, as a water-stopping material installation step, a water-stopping material 4 formed by molding a water-expandable rubber into a sheet is placed on the inner peripheral surface of the existing pipe 3 before the expansion of the rehabilitating pipe 1. Soft vinyl chloride which is adhered over the entire area in the circumferential direction with a substantially uniform thickness, and which is compressed and deformed with the existing pipe 3 when the diameter of the rehabilitation pipe 1 is increased at both ends in the pipe axis direction of the water blocking material 4. Members 5 and 5 (elastic members) serving as restraining means made of O-rings made of aluminum. The surface on the front side (rehabilitation pipe 1 side) of the water blocking material 4 is covered with a pet film (not shown). At this time, the width of the water blocking material 4 (the axial dimension of the existing pipe 3) is set to about 50 mm.
[0025]
Next, as a rehabilitation pipe laying step, as shown in FIG. 3, the tip of the wire 54 led out from the winch 51 is guided from the lower end of the downstream manhole Q2 to the lower end of the upstream manhole Q1 via the existing pipe 3. . Then, the drum 26 is rotated, and the tip of the rehabilitation pipe 1 is led out to the lower end of the upstream manhole Q1, that is, the upstream end of the existing pipe 3. Then, in the upstream manhole Q <b> 1, a tip 53 is attached to the tip of the rehabilitation pipe 1, and the tip of the wire 54 extending from the winch 51 is locked to the tip 53. Thereafter, with the tip of the rehabilitation pipe 1 sent out from the drum 26 inserted into the existing pipe 3, the rehabilitation pipe 1 is pulled by winding the wire 54 with the winch 51, and the rehabilitation pipe 1 is connected to the existing pipe 3. I draw inside. By this operation, the rehabilitation pipe 1 is guided from the upstream manhole Q1 side to the downstream manhole Q2 side, and is laid over the entire length of the existing pipe 3 connecting the upstream manhole Q1 and the downstream manhole Q2. FIG. 5A shows an arrangement state of the rehabilitation pipe 1 in the existing pipe 3 at this time. At this time, since the front surface of the water-stopping material 4 is covered with the pet film, the water-stopping material 4 is rehabilitated by the operation of the winch 51 pulling the rehabilitation pipe 1 into the existing pipe 3 via the wire 54. The rehabilitation pipe 1 can be smoothly pulled in without being dragged by the pipe 1 and the wire 54. Thereafter, the pet film covering the front surface side of the water blocking material 4 is peeled off.
[0026]
After that, it proceeds to the lining step. In this lining step, as shown in FIG. 6, a steam generator / pressurizer 55 is provided on the ground near the upstream manhole Q1, and a water / steam separator 56 is provided on the ground near the downstream manhole Q2. . An elbow 57 is connected to the rear end of the rehabilitation pipe 1, a hose 55 a extending from the steam generating / pressurizing unit 55 is connected to the elbow 57, and a hose extending from the water / steam separator 56 is connected to the tip 53 at the tip of the rehabilitation pipe 1. 56a. Further, a temperature sensor (not shown) is attached to the elbow 57 and the tip tool 53. In this state, steam is continuously supplied into the rehabilitation pipe 1 from the steam generator / pressurizer 55, and the rehabilitation pipe 1 is heated from the inside to the shape recovery temperature while flowing the steam to the water / steam separator 56. Then, the shape is restored to the substantially original cylindrical body. FIG. 5B shows a state of the rehabilitation pipe 1 in the existing pipe 3 at this time.
[0027]
After the rehabilitation pipe 1 is restored to the cylindrical shape in this way, the tip tool 53 is closed, and compressed air is sent from the steam generator / pressurizer 55 into the rehabilitation pipe 1 as shown in FIG. Next, the rehabilitating pipe 1 is pressurized and expanded from the inside thereof and is brought into close contact with the inner surface of the existing pipe 3 (the state of the rehabilitating pipe 1 in the existing pipe 3 at this time is shown in FIG. 5C). In this state, the system is cooled and fixed, and the lining work on the inner surface of the existing pipe 3 is completed.
[0028]
At this time, the water-stopping material 4 adhered over the entire area in the circumferential direction with a substantially uniform thickness on the inner peripheral surface of the existing port 3 of the existing pipe 3 before the rehabilitation pipe 1 is expanded. The flow due to the reaction is restrained by the restraining members 5 and 5 at both ends, and as shown in FIG. The pipes at both ends of the rehabilitating pipe 1 are pressed against the pipe ports at both ends of the existing pipe 3 so as to be able to secure water tightness between the restricting members 5 and 5 over the entire circumferential direction between the pipe ports at both ends. A sealing step for sealing is performed. In this case, each restraining member 5 is elastically deformed into a substantially elliptical shape by the pressurized expansion of the rehabilitation pipe 1.
[0029]
−Evaluation test of waterproof material−
Here, as shown in FIG. 7, when the inside of the existing pipe 3 made of a fume pipe is rehabilitated by the rehabilitation pipe 1 made of vinyl chloride, the gap between the ports at both ends of the existing pipe 3 and the ports at both ends of the rehabilitation pipe 1 are formed. The water stoppage of the waterstop 4 is evaluated by applying a water pressure between the existing pipe 3 and the rehabilitation pipe 1 in the case where several types of waterstops 4 are interposed.
[0030]
In this case, as shown in Table 1 below, a water-swelling rubber, a modified silicone or a non-crosslinked butyl rubber is applied as the water-stopping material 4, while an O-ring made of hard vinyl chloride or soft vinyl chloride is used as the restraining member 5. A Z-type packing made of soft vinyl chloride is applied, and the water stopping performance is evaluated by a combination of these. Here, the final pressure value of the water pressure is increased to 0.1 MPa by the pressure gauge 44, but for those not increasing to 0.1 MPa, the pressure value at the time of water leakage is measured.
[0031]
[Table 1]

[0032]
As shown in Table 1, when the water-swelling rubber is applied as the water-stopping material 4 and the restraining member is not used, the water-swelling rubber is gradually removed from the pipe ports at both ends of the existing pipe 3 and the pipes at both ends of the rehabilitation pipe 1. Although it protruded from the mouth with time, it was confirmed that the water pressure increased to 0.01 MPa. In this case, since the actual pressure value of the water pressure applied between the existing pipe 3 and the rehabilitation pipe 1 is less than 0.01 MPa, it is not sufficient, but it can be said that the water stoppage is secured to some extent. Evaluation is △.
[0033]
If modified silicon or non-crosslinked butyl rubber is used as the water-stopping material 4 and no restraint member is used, before the pressure value of the water pressure rises, the pipe ports at both ends of the existing pipe 3 and the pipes at both ends of the rehabilitation pipe 1 are required. Since water leaked from between the mouth and water stoppage could not be ensured at all, the evaluation was x.
[0034]
When a water-swelling rubber is used as the water-stopping material 4 and a restraining member 5 made of an O-ring made of hard vinyl chloride is used, when the pressure value of the water pressure rises to 0.03 MPa, both ends of the existing pipe 3 are closed. Since it was confirmed that water leaked from between the pipe mouth and the pipe mouths at both ends of the rehabilitation pipe 1, it is considered that sufficient water stoppage can be ensured, and the evaluation is ○.
[0035]
Further, when a water-swelling rubber is applied as the water-stopping material 4 and a restraining member 5 made of an O-ring or a Z-shaped packing made of soft vinyl chloride is used, even if the pressure value of the water pressure rises to 0.1 MPa. Since it was confirmed that water did not leak from between the pipe ports at both ends of the existing pipe 3 and the pipe ports at both ends of the rehabilitation pipe 1, it was considered that a very high water stopping property could be secured, and the evaluation was ◎.
[0036]
-Effects of Embodiment-
Therefore, in the present embodiment, the water stopping material 4 interposed between the mouth of the existing pipe 3 and the mouth of the rehabilitation pipe 1 is substantially uniform between the rehabilitation pipe 1 and the existing pipe 3 when the diameter of the rehabilitation pipe 1 is expanded. Deformation (progress of reaction), which easily progresses in the tube axis direction, is restricted between the blocking members 5 and 5 at both ends in the tube axis direction of the water blocking material 4 so as to seal over the entire area in the circumferential direction at the thickness. Compressed in the state, a substantially uniform compression rate in the circumferential direction is secured, sufficient water stopping performance by the water stopping material 4 is exhibited, and the elastic deformation of the blocking member 5 itself made of an O-ring made of soft vinyl chloride. The water stopping effect of the existing pipe 3 and the pipe opening of the rehabilitation pipe 1 can be further effectively improved.
[0037]
Moreover, since the water-stopping material 4 and the blocking members 5 and 5 at both ends thereof are interposed between the ports at both ends of the existing pipe 3 and the ports at both ends of the rehabilitation pipe 1, the epoxy resin is expanded after the rehabilitation pipe is expanded. There is no increase in the number of steps after the construction or the construction time as in the case of filling the vicinity of the mouth with mortar or the like. That is, in the present embodiment, the seal-shaped water-stopping material 4 is adhered to the inner peripheral surface of the existing pipe 3 at both ends of the rehabilitating pipe 1 before the diameter expansion of the rehabilitating pipe 1 in a substantially uniform thickness over the entire circumferential direction. If the diameter of the rehabilitation pipe 1 is increased by pasting the restraining members 5 each formed of a ring, the circumference of the rehabilitation pipe 1 is substantially uniform in thickness between the ports at both ends of the existing pipe 3 and the ports at both ends of the rehabilitation pipe 1. The water-stopping material 4 that seals over the entire area in the direction is easily interposed, and the water-stopping material 4 and the restraining member 5 are disposed between the ports at both ends of the existing pipe 3 and the ports at both ends of the rehabilitation pipe 1. Construction can be performed easily and easily while shortening the construction time when interposing.
[0038]
Further, since the water-swelling rubber is used as the water-stopping material 4, the water-swelling rubber deforms and easily follows collapses and cracks generated near the mouth of the deteriorated existing pipe 3, It is possible to further improve the water stopping property between the mouth of the existing pipe 3 and the mouth of the rehabilitation pipe 1.
[0039]
-Other embodiments-
Note that the present invention is not limited to the above-described embodiment, but includes various other modifications. For example, in the above-described embodiment, the water-stopping material 4 formed of a sheet of water-expandable rubber is attached to the inner peripheral surface of the existing port 3 of the existing pipe 3 before the expansion of the rehabilitation pipe 1 over the entire area in the circumferential direction with a substantially uniform thickness. At the same time, the restraining members 5 composed of O-rings were attached to both ends in the axial direction of the pipe, respectively. It may be adhered over the entire area in the circumferential direction with a substantially uniform thickness, and restraining members made of O-rings may be adhered to both ends in the tube axis direction. In this case, the surface on the front side (the existing pipe side) of the water blocking material may be covered with a pet film.
[0040]
In the above embodiment, the blocking members 5 and 5 made of an O-ring made of soft vinyl chloride are attached to both ends of the water-stopping material 4 in the pipe axis direction. A blocking member (blocking means) made of a Z-shaped packing made of soft vinyl chloride or an O-ring made of hard vinyl chloride may be appropriately combined and attached. Furthermore, as a blocking member for at least one of the inner peripheral surface of the existing pipe and the outer peripheral surface of the rehabilitating pipe, deformation of the water-stopping material (outflow in the pipe axis direction due to the progress of the reaction of the water-swelling rubber) is prevented by retention. A recess (blocking means) may be applied. In this case, the blocking member does not hinder the work of drawing the rehabilitation pipe into the existing pipe, and the work of pulling the rehabilitation pipe smoothly. In addition, it is not necessary to separately prepare an O-ring, a Z-type packing, or the like as a blocking member, and the cost of the material can be reduced.
[0041]
In the above embodiment, the water-stopping material 4 made of water-swelling rubber is used. However, a compression-deformable member such as mortar that deforms in the pipe axis direction due to compression or the like when the rehabilitating pipe is expanded may be applied.
[0042]
【The invention's effect】
As described above, in the present invention, the compression-deformation member interposed between the mouth of the existing pipe and the mouth of the rehabilitation pipe has a substantially uniform thickness with the existing pipe when the rehabilitation pipe is expanded. A substantially uniform compression ratio in the circumferential direction can be achieved by compressing in a state where deformation that is easily deformed in the tube axis direction is restricted between the blocking means at both ends in the tube axis direction so as to seal over the entire region in the circumferential direction. It is possible to secure sufficient water stoppage between the mouth of the existing pipe and the mouth of the rehabilitation pipe. In addition, in providing the compression deformation member and the blocking means, the number of steps after the construction is not increased and the construction time is not increased, and the construction can be performed easily and easily while shortening the construction time.
[0043]
In addition, a seal-like compression-deformable member having a substantially uniform thickness is stuck on the inner peripheral surface of the existing pipe opening or the outer peripheral surface of the opening of the rehabilitating pipe before the diameter expansion of the rehabilitating pipe over the entire circumferential direction. By providing the blocking means at both ends in the axial direction, if the diameter of the rehabilitating pipe is increased, the pipe is sealed over the entire area in the circumferential direction with a substantially uniform thickness between the port of the existing pipe and the port of the rehabilitating pipe. It is possible to easily interpose the compression deformation member together with the blocking means, and it is possible to ensure sufficient water stoppage between the existing pipe mouth and the rehabilitation pipe mouth, as well as to simplify and reduce the construction time. It can be easily constructed.
[0044]
And, by applying the water expansion rubber as the compressive deformation member, the collapse and cracks occurring near the pipe mouth of the deteriorated existing pipe can easily follow by the deformation of the water expansion rubber by the deformation of the water expansion rubber, and the pipe mouth of the existing pipe. And the water stop between the rehabilitation pipe and the mouth of the rehabilitation pipe can be further improved.
[0045]
In addition, by applying a ring-shaped elastic member as a blocking means, in addition to the water stopping performance of the compression deformable member, a water stopping effect due to the elastic deformation of the elastic member itself at both ends in the pipe axis direction can be exhibited. The water stoppage between the port of the rehabilitation pipe and the port of the rehabilitation pipe can be further effectively improved.
[0046]
On the other hand, by applying a concave portion for retaining the compressively deformable member deforming in the pipe axis direction as the blocking means, the work of drawing the rehabilitating pipe into the existing pipe can be performed smoothly, and the blocking means such as an elastic member can be performed. Can be eliminated, and the cost of the material can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a rehabilitation pipe before a rehabilitation operation according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining a manufacturing process of a rehabilitation pipe.
FIG. 3 is a diagram illustrating a rehabilitation pipe laying step of drawing a rehabilitation pipe into an existing pipe.
FIG. 4A is a cross-sectional view of the vicinity of an upstream manhole-side mouth of the rehabilitation pipe before the rehabilitation pipe is expanded in diameter. (B) is a sectional view near the upstream manhole-side mouth of the rehabilitation pipe in a state where the rehabilitation pipe is expanded in diameter.
FIG. 5A is a cross-sectional view showing a state in which a rehabilitation pipe is drawn into a buried pipe.
(B) is a sectional view showing a state in which the rehabilitation pipe is heated to recover its shape.
(C) is a cross-sectional view showing a state in which the rehabilitation pipe is pressurized and expanded and is brought into close contact with the inner surface of the buried main pipe.
FIG. 6 is a diagram illustrating a lining step of lining a rehabilitating pipe in an existing pipe.
FIG. 7 is a schematic cross-sectional view of an existing pipe and a rehabilitating pipe in a case where an experiment for evaluating the water stopping performance of a water stopping material by applying a water pressure is performed.
[Explanation of symbols]
1 Rehabilitation pipe 3 Existing pipe 4 Water stoppage material (compression deformation member, elastic member)
5 Blocking member (blocking means)

Claims (8)

A watertight structure for a rehabilitation pipe which has a rehabilitation pipe that rehabilitates an existing pipe, so that the rehabilitation pipe has a water stop relative to the existing pipe.
Between the opening of the existing pipe and the opening of the rehabilitating pipe, a compression is performed so as to seal over the entire area in the circumferential direction with a substantially uniform thickness when the rehabilitation pipe is expanded, and to be deformed in the axial direction of the pipe. With the deformation member interposed,
A water blocking structure for a rehabilitating pipe, wherein blocking means for preventing deformation of the compression deforming member in the pipe axis direction is provided at both ends of the compression deformation member in the pipe axis direction. The water blocking structure for a rehabilitation pipe according to claim 1,
A water blocking structure for a rehabilitation pipe, wherein a water-swelling rubber is applied as the compression deformation member. In the mouth water stopping structure of the rehabilitation pipe according to claim 1 or 2,
A ring-shaped water stopping structure for a rehabilitating pipe, wherein a ring-shaped elastic member that is compressed and deformed with an existing pipe when the rehabilitating pipe is expanded is applied as the blocking means. In the mouth water stopping structure of the rehabilitation pipe according to claim 1 or 2,
As the blocking means, a recess provided on at least one of the inner circumferential surface of the existing pipe and the outer circumferential face of the rehabilitating pipe and for retaining a compressively deformable member that deforms in the pipe axis direction is applied. Water stop structure at pipe mouth. A method for stopping water of a rehabilitation pipe at a mouth of the rehabilitation pipe for rehabilitating an existing pipe, with respect to the existing pipe,
A seal-like compression-deformable member having a substantially uniform thickness is adhered to the inner peripheral surface of the existing pipe opening or the outer peripheral surface of the opening of the rehabilitating pipe before the diameter expansion of the rehabilitating pipe over the entire circumferential direction. Prevention means for preventing deformation of the compressively deformable member in the tube axis direction are attached to both ends of the member in the tube axis direction,
After that, by expanding the rehabilitating pipe, the compression deformable member is compressed between the blocking means at both ends in the axial direction of the rehabilitating pipe, thereby sealing between the opening of the existing pipe and the opening of the rehabilitating pipe. The method of stopping water at the mouth of a rehabilitation pipe. In the method for stopping water from a mouth of a rehabilitation pipe according to claim 5,
A method for stopping water at a mouth of a rehabilitation pipe, wherein a water-expandable rubber is applied as the compression deformation member. In the method for stopping water from a mouth of a rehabilitation pipe according to claim 5 or 6,
A method of stopping water at the mouth of a rehabilitating pipe, wherein a ring-shaped elastic member that is compressed and deformed with an existing pipe when the rehabilitating pipe is expanded is applied as the blocking means. In the method for stopping water from a mouth of a rehabilitation pipe according to claim 5 or 6,
As the blocking means, a concave portion is provided which is provided on at least one of the inner peripheral surface of the existing pipe and the outer peripheral surface of the rehabilitating pipe and which retains a compressively deformable member which is deformed in the pipe axis direction. How to stop the mouth of the rehabilitation pipe.

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