JP2010208289A - Tubular lining material for repairing existing pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tubular lining material for inhibiting concentrated internal bubble generation when restoring work is carried out, wherein the restoring work restores original cylindrical shape from a flat shape in a transport process to the job site after factory production. <P>SOLUTION: A body of tubular lining material 10 includes at least internal and external two layers (10-1, 10-2) and bubble movement is made more difficult in the internal layer 10-1 than in the outer layer 10-2. Thereby, a situation that microscopic bubbles gather inside a coating film can be avoided when uncured tubular lining material is introduced into the existing pipe and deformed from the flat shape compressed in the transport process to the cylindrical shape by pressurized air, etc. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an improvement in a tubular lining material for repairing an existing pipe, which is configured by impregnating a cylindrical base material with an uncured resin and is cured in an existing pipe.

  In general, for pipes buried in the ground such as sewer pipes, it is inevitable that various deformations will occur over the years since installation, such as cracks, steps due to misalignment, diameter changes, etc. For this reason, there are problems that the flow force of the sewage pipe decreases and the amount of treated sewage increases due to the ingress of groundwater into the pipe.

  Such existing sewage pipe regeneration repair technology includes the method of excavating the ground by working from the ground, digging out an old pipe from the ground, and inserting a new pipe, or non-cutting from the inside of the pipe. A work method for repairing the surface, and a method of inserting a new pipe into the existing pipe without cutting are employed.

  As a repair method for inserting a new pipe by non-open cutting, for example, an uncured tubular lining material is introduced into an existing pipe to be repaired, the uncured tubular lining material is expanded to the inner surface of the existing pipe, and the expansion is performed. An existing pipe rehabilitation method for repairing an existing pipe by curing the tubular lining material in a diameter state is known.

  The tubular lining material used for such existing pipe rehabilitation is a film-like sealing member (inner film, outer film) for preventing the sticking of the inner and outer surfaces of the cylindrical fibrous base material by impregnating the resin with the resin at the factory. Film) and manufactured in an uncured state. The resin used is photocurable, thermosetting, or a combination of both properties, if desired. After being introduced into the existing pipe uncured, it is expanded in diameter as described above. Is cured by light irradiation or heat treatment.

  The tubular lining material as described above is used by being transported in an uncured state from the factory to the site. At the time of transportation, the tubular lining material is in an uncured state. Therefore, as shown in FIG. The material 100 has a flat and flat shape, and is overlapped or wound in this state. (The reference numeral 102 in the figure is the above-mentioned inner film, and 104 is another film that fits.) Then, it is introduced into the existing pipe to be repaired from one end side at the site. As the introduction method, pull-in introduction that is pulled by pulling from the other side with a wire or the like, or reverse introduction that is introduced while reversing the front and back is adopted. Further, after the tubular lining material is introduced in an uncured state, the diameter of the tubular lining material is expanded by blowing compressed air into the tubular lining material as shown in FIG. That is, the tubular lining material returns to the original cylindrical shape.

  The introduction of the tubular lining material as described above into the existing pipe, the diameter expansion after the introduction, and the hardening operation are disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 8-265245). For example, FIG. 1 of the document shows the drawing operation of the uncured tubular lining material, FIG. 2 of the document shows the reversal introduction operation of the uncured tubular lining material, and FIG. Has been.

JP-A-8-265245

  As described above, when the uncured tubular lining material manufactured at the factory is deformed into a flat shape, it is folded with a large curvature at both ends as shown in the partial explanatory view of FIG. In the bent part, a slightly thin part is generated. And it introduce | transduces in an existing pipe | tube in this state, and the diameter expansion by blowing in of compressed air etc. is performed. This shape return state is shown in the partial explanatory view of FIG. 7. As shown in the figure, the bent side end portion returns to the cylindrical shape and the original thickness by the addition of air pressure from the inside.

  However, at this time, a negative pressure region is generated inside the inner film 102 in the process of returning to the original shape. Due to the occurrence of this negative pressure state, bubbles are concentrated and generated inside the inner film 102. That is, due to the occurrence of the negative pressure state, the fine bubbles X that existed in the tubular lining material 100 emerge. It moves along the inner surface of the inner film 102 and concentrates as large bubbles in the bent portion of the inner film 102 as shown.

  As described above, the tubular lining material 100 is formed by impregnating a fibrous base material with a resin. In the impregnation operation, it is difficult to completely eliminate residual bubbles, but fine bubbles In the dispersed state, there is no particular hindrance to the quality of the tubular lining material, but as described above, the situation where it is concentrated at a predetermined location inside the inner film 102 may affect the quality and should be avoided. Is required.

  The present invention has been made in view of the above circumstances, and its purpose is to perform a return operation from a flat shape to an original cylindrical shape in the process of being transported to the site after being manufactured in a factory. Another object of the present invention is to provide a tubular lining material capable of preventing the concentration of bubbles inside.

In order to achieve the above object, a tubular lining material for repairing an existing pipe according to claim 1 is:
An existing pipe that is formed by covering the inner and outer surfaces of a main body portion formed by impregnating a cylindrical base material with an uncured resin with a film-like covering material, and is inserted into the existing pipe and cured for rehabilitation of the existing pipe In the tubular lining material for repair,
The main body has at least two inner and outer layers, and is more difficult to move bubbles inside the inner layer than the outer layer.

  According to this configuration, when the uncured tubular lining material formed into a tubular shape is introduced into an existing pipe from a flatly crushed state during transportation, for example, when the shape is changed to a circular shape by pressurized air. In addition, it is possible to avoid a situation in which bubbles are collected on the inner coating film side. In other words, the configuration of the tubular lining material is not homogeneous, and the inner layer is provided with a layer that is more difficult to move bubbles inside than the outer layer, and the movement of bubbles in the vicinity of the inner coating film is provided. Can be suppressed. Thereby, it is possible to avoid the concentration of bubbles on the inner coating film side and the concentration of bubbles along the inner coating film.

A tubular lining material for repairing an existing pipe according to claim 2 is:
The viscosity of the uncured resin impregnated in the inner layer is made higher than the viscosity of the uncured resin impregnated in the outer layer, thereby increasing the difficulty of movement of the bubbles,
A tubular lining material for repairing an existing pipe according to claim 3 is:
The uncured resin to be impregnated is characterized in that at least the inner layer is a photo-curable resin and the viscosity is increased by adding magnesium oxide to increase the difficulty of movement of the bubbles.

  The structure of each said claim raises the difficulty of the movement of the bubble inside by raising the viscosity of resin which makes a base material impregnate. This is because as the viscosity of the uncured resin increases, that is, the movement of an object existing in the resin in the resin increases and resistance to the movement increases. Therefore, it is possible to easily increase the difficulty in moving bubbles by increasing the viscosity of the inner layer.

A tubular lining material for repairing an existing pipe according to claim 4 is:
The cylindrical base material is formed of a fiber material, and the density of the base material of the inner layer is made higher than the density of the base material of the outer layer, thereby increasing the difficulty in moving the bubbles. Features. The base material is preferably composed of a fibrous material such as felt, but in that case, even if the same resin is impregnated by changing the density of the fibers in the inner layer and the outer layer, the internal bubbles The difficulty of moving can be changed. For example, by using fibers of the same thickness and increasing the number of fibers per unit volume, it is possible to increase the density, thereby increasing the difficulty of moving bubbles in the inner layer. In addition, even if the fiber occupancy per unit volume is the same, use of a smaller fiber diameter can increase the difficulty in moving bubbles.

A tubular lining material for repairing an existing pipe according to claim 5 is:
The main body has a three-layer structure, and is more difficult to move bubbles inside the inner layer and the outer layer than the intermediate layer. According to this configuration, when the uncured tubular lining material is changed into a circular shape in the existing pipe as described above, it is possible to avoid a situation where bubbles are collected on the outer coating film side. The concentration of bubbles on the outer coating film side is not as noticeable as that on the inner coating film side, but the situation of being bent and deformed flat during transportation is the same for the outer coating film. Therefore, the concentration of bubbles can be suppressed on both the inner and outer side surfaces of the bent portion.

  As described above, according to the tubular lining material for repairing an existing pipe according to the present invention, an uncured tubular lining material having a cylindrical basic shape is added from the flat shape at the time of transportation into the existing pipe. When returning to a circular shape by compressed air or the like, it is possible to effectively avoid a situation in which bubbles are collected on the inner surface of the coating film with a simple configuration. That is, the inner and outer structures of the tubular lining material are not made to be the same, and the movement of the bubbles inside is suppressed by increasing the difficulty of moving the bubbles on the coating film side. Thereby, the homogeneity of the hardened tubular lining material improves, and the reliability of the quality as a rehabilitation pipe | tube is improved.

The structure of the tubular lining material which concerns on embodiment is shown, and the shape state at the time of conveyance is shown. It is explanatory drawing which shows the state of the sewer main as an example to which the tubular lining material which concerns on embodiment of FIG. 1 is applied. It is a partial explanatory view showing a state when the tubular lining material according to the embodiment of FIG. 1 returns to a circular shape in the sewer main. It is a structure explanatory drawing which shows the structure of other embodiment. It is composition explanatory drawing which shows the structure of other embodiment. It is composition explanatory drawing of the conventional common tubular lining material, (A) And (B) is a partial explanatory drawing which shows the state at the time of carrying out the shape state at the time of conveyance, respectively, and returning to circular shape in the existing pipe | tube. It is explanatory drawing which shows the bubble concentration state at the time of the return to the cylindrical shape of a tubular lining material.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a configuration of a tubular lining material 10 according to an embodiment. The surface coating is performed on the inner film 14 and the outer film 16 in the same manner as the conventional configuration shown in the figure. Moreover, the figure shows the flat state in the process of conveying to the existing pipe of the repair object which is a construction site after manufacture.

  As illustrated, the tubular lining material 10 has two layers (10-1 and 10-2) inside and outside, and the inner layer 10-1 is more difficult to move bubbles inside than the outer layer 10-2. The material constituting the layer is selected so as to increase the property. In the present embodiment, the substrate 12 is formed of felt (nonwoven fabric), but is formed of glass fiber, glass fiber and felt, or a combination of both, and impregnated with resin. The inner base material 12-1 and the outer base material 12-2 have the same configuration in terms of the state of the fibers and the like. That is, the degree of congestion is not changed. However, in the present embodiment, the inner and outer layers 10-1 and 10-2 are configured as different layers by impregnating different resins with each other.

  Further, at least the inner layer 10-1 is impregnated with a photocurable resin, and the impregnated resin is, for example, a resin that can be cured by light irradiation by mixing a photoinitiator into a resin such as a vinylester resin or an unsaturated polyester resin. It is done. In order to increase the viscosity of the inner layer 10-1, about 0.15 to 3.0% by weight of MgO (magnesium oxide) is added. Moreover, the thickness of the inner layer 10-1 is set to 2 mm to 3 mm.

  The impregnating resin for the outer layer 10-2 is not particularly limited to the photo-curing resin, and it is also possible to use a thermosetting resin or a resin mixed with both heat and light curing catalysts. No material has been added to enhance it. The thickness is set to 2 mm to 30 mm, and at least the viscosity is set to be lower than that of the inner layer 10-1.

  FIG. 2 shows an outline of actually applying the tubular lining material 10 shown in FIG. 1 to a sewage pipe to be repaired, and this example shows an example of a sewer main 200 as an existing pipe to be repaired. ing. As shown in the drawing, a sewer main 200 is disposed between manholes 300 and 400 installed at a predetermined interval.

  The tubular lining material 10 is, for example, wound and stored in a supply unit 11 installed on the ground on the manhole 300 side, and is supplied into the manhole 300 while being gradually rewound. A guide reel or the like installed in the middle is not shown. Although not shown in the figure, the inner layer 10-1 of the tubular lining material 10 is impregnated with a photocurable resin, and MgO (magnesium oxide) is used to increase the viscosity of the inner layer 10-1. Is appropriately added within the above-mentioned range. Although not shown in the figure, in the present embodiment, the outer layer 10-2 is impregnated with a thermosetting resin, and no MgO (magnesium oxide) is added to increase the viscosity. . That is, the viscosity is set to be lower than that of the inner layer 10-1. The outer layer 10-2 can also be impregnated with a photocurable resin, in which case the amount of MgO (magnesium oxide) added to increase the viscosity is smaller in the outer layer 10-2. Is set.

  Moreover, as shown in FIG. 1, the tubular lining material 10 is wound and is sequentially pulled out from the storage case 11 in a flat state, and is pulled to the manhole 400 side by a wire 500 in an uncured state, thereby being sewered. It is drawn into the main pipe 200 and introduced. Then, after the step of introducing the tubular lining material 10, the diameter of the tubular lining material 10 is increased by a known method, for example, by blowing pressurized air into the interior, and the outer peripheral surface of the tubular lining material 10 is sewer main 200. It adheres to the inner peripheral surface 200a.

  FIG. 3 is a partial explanatory view of the tubular lining material 10 that has been introduced into the sewer main 200 and expanded in a substantially circular shape. As shown in the figure, even when the uncured tubular lining material 10 is changed from a flattened state to a substantially circular cross-section, it is possible to avoid a situation where bubbles are collected inside the inner film 14. . That is, the viscosity of the inner layer 10-1 is higher than that of the outer layer 12-2, that is, the conventional layer, and the difficulty of moving bubbles inside is increased. Therefore, when the portions of the tubular lining material 10 that are bent at a large curvature at both ends in the flat state return to expand in a circular shape, the bubbles that are slightly present as fine bubbles in the substrate 12 are on the inner film 14 side. It is possible to suppress the movement of bubbles that start to move and gather along the inner film.

  Such an action is based on the fact that the stronger the viscosity of the uncured resin, the more difficult it is to move the object existing in the resin, that is, the resistance to the movement of the object increases. It is because it is suppressed.

  FIG. 4 shows another embodiment. As shown in the figure, the tubular lining material 20 is also configured in two layers (20-1 and 20-2) on the inner and outer sides, and the inner and outer surfaces are similarly covered with the inner film 24 and the outer film 26. . What is characteristic in the present embodiment is that each layer is formed as a configuration for making the inner layer 20-1 more difficult to move bubbles inside than the outer layer 20-2. Therefore, the density of the fibers 28 is changed between the inner base material 22-1 and the outer base material 22-2. For example, the fibers have the same thickness, and the number of fibers per unit volume is set so that the fibers 28-2 of the outer layer 20-2 are larger than the inner base material 22-1. In addition, the same thing is used about resin to impregnate.

  According to this embodiment, similar to the configuration of the embodiment of FIG. 1 described above, the state in which the tubular lining material 20 collects bubbles inside the inner film 24 when returning to a substantially circular shape is avoided. can do. That is, since the inner base material 22-1 has a higher fiber density than the outer layer base material 22-2, the freedom of movement of bubbles by the fibers is reduced, and the difficulty of movement of bubbles inside is increased. Yes.

  FIG. 5 shows still another embodiment. As shown in the drawing, the tubular lining material 30 is composed of three layers (30-1, 30-2, 30-3) of inner, middle, and outer. That is, the difficulty of movement of bubbles inside the inner layer 30-1 and the outer layer 30-3 is made higher than that of the intermediate layer 30-2. Various methods such as adjustment of the viscosity of the impregnating resin and the fiber density of the substrate can be employed as a method for increasing the difficulty of moving the bubbles inside. According to this embodiment, when the uncured tubular lining material 30 is changed into a circular shape in the existing pipe as described above, it is also possible to avoid a situation where bubbles are collected on the outer film 36 side. It becomes. The concentration of bubbles on the outer film 36 side is larger than that on the inner film 34 side because the curvature when the shape is flat is not as high as that on the inner film 34 side. Since the situation in which the flat film is deformed flat is the same on the outer film 36 side, the concentration of bubbles at the time of shape recovery can be avoided over the entire tubular lining material 30 by this embodiment. .

  The present invention is not limited to the configuration shown in the above embodiment, and various modifications are possible within the scope of the gist of the invention. For example, in order to adjust the difficulty of movement of bubbles in the tubular lining material so that the inner layer is higher, in the embodiment of FIG. Further, in the embodiment of FIG. 4, the impregnation resin is common and the density of the fiber layer of the base material is adjusted. However, both the density of the fiber of the base material of the inner layer and the impregnation resin are both adjusted. It is also possible to adopt a configuration in which the difficulty of moving bubbles is higher than that. That is, it is possible to increase the density of the fibers and add a material for increasing the viscosity.

10, 20, 30 Tubular lining material 10-1, 20-1 Inner layer 10-2, 20-2 Outer layer 12, 22, 32 Base material 14, 24, 34 Inner film 16, 26, 36 Outer film 30-1 Inner layer 30-2 Middle layer 30-3 Outer layer

Claims (5)

An existing pipe that is formed by covering the inner and outer surfaces of a main body portion formed by impregnating a cylindrical base material with an uncured resin with a film-like covering material, and is inserted into the existing pipe and cured for rehabilitation of the existing pipe In the tubular lining material for repair,
The tubular body lining material for repairing an existing pipe, wherein the main body portion has at least two layers, an inner layer and an outer layer, and is more difficult to move bubbles inside the inner layer than the outer layer.   2. The difficulty in movement of the bubbles is increased by making the viscosity of the uncured resin impregnated in the inner layer higher than the viscosity of the uncured resin impregnated in the outer layer. The tubular lining material for existing pipe repair described. The cylindrical substrate is formed of a fiber material,
The density of the base material of the inner layer is made higher than the density of the base material of the outer layer, thereby increasing the difficulty of movement of the bubbles. Tubular lining material for repairing existing pipes. The uncured resin to be impregnated is
The existing pipe repair according to any one of claims 1 to 3, wherein at least the inner layer is made of a photo-curing resin, and magnesium oxide is added to increase the viscosity to increase the difficulty of movement of the bubbles. Tubular lining material.   The said main-body part is made into 3 layer structure, and the difficulty of the movement of the bubble inside an inner side layer and an outer side layer was made higher than an intermediate | middle layer, The any one of Claim 1 to 4 characterized by the above-mentioned. Tubular lining material for repairing existing pipes.

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