JP2018065356A - Method for existing pipe renovation and existing pipe renovation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a renovation method and a renovation structure of an existing pipe capable of maintaining pipe strength after renovation and having excellent cutoff property.SOLUTION: The invention relates to a method of renovation of an existing pipe 100, wherein the existing pipe renovation method includes: a renovation pipe installation step where a renovation pipe 20 is installed in an inside of the existing pipe 100; and a cutoff reinforcement layer formation step where an age-hardening resin composition is sprayed to a peripheral surface 20a of the renovation pipe 20 and a cutoff reinforcement layer 58 is formed on the inside of the renovation pipe 20 by hardening of the sprayed resin composition.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an existing pipe rehabilitation method and an existing pipe rehabilitation structure.

  Existing pipes such as sewage pipes deteriorate with long-term use, and their useful life is generally about 50 years. Therefore, the number of sewer pipes that have exceeded the useful life is increasing year by year. In particular, sewage pipes that have deteriorated are deformed or cracked, which not only lowers the function of sewage flow, but also creates cavities in the ground due to the flow of groundwater and earth around the sewage pipe into the sewage pipe. It is also the cause of the ground collapse. In addition, sewage pipes buried in the ground may be easily affected by ground fluctuations such as earthquakes, and at present, some kind of repair is required at a predetermined time.

  As an existing pipe rehabilitation method, a method of coating an inner surface of an existing pipe with a lining material is known. As such a method, for example, a method described in Patent Document 1 is known. In this method, a fiber material such as glass fiber is impregnated with a curable resin composition that is cured by light or heat. After the tubular lining material is introduced into the existing pipe in an uncured state, the lining material is pressed against the inner surface of the existing pipe by introducing compressed air into the sealed space formed by closing both ends of the lining material The lining material is cured by light or heat. Thereby, the existing pipe is rehabilitated by forming the resin-made rehabilitation pipe inside the existing pipe.

JP 2001-260223 A

  The lining material used in the repair method as described above may have minute bubbles remaining inside during its manufacturing (impregnation) process, and this causes a very small pinhole in the rehabilitation pipe formed. There is. If pinholes are generated, the water stoppage may not be secured, and groundwater or earth and sand may flow into the pipeline from outside the existing pipe.

  In addition, the larger the diameter of the existing pipe to be rehabilitated, the greater the thickness of the lining material needs to be in order to ensure appropriate strength of the rehabilitated pipe. However, when the thickness of the lining material is increased, the weight increases accordingly, which may hinder the work of introducing the lining material into the existing pipe. Moreover, when using the lining material which impregnated the photocurable resin composition, when the thickness becomes large, light may not fully penetrate into the interior during light irradiation, and curing may be insufficient.

  Accordingly, an object of the present invention is to provide an existing pipe rehabilitation method and a rehabilitation structure that can sufficiently ensure the strength of the pipe after rehabilitation and have excellent water blocking properties.

In order to solve the above object, the existing pipe rehabilitation method according to claim 1 is:
A rehabilitation pipe installation step of installing a rehabilitation pipe inside the existing pipe;
Forming a waterstop reinforcement layer on the inner peripheral surface of the rehabilitation pipe by spraying a resin composition that cures with time, and forming a waterstop reinforcement layer on the inner side of the rehabilitation pipe by curing the injected resin composition Process,
It is characterized by including.

  According to this structure, since the water stop reinforcement layer is further provided inside the rehabilitation pipe, when a pinhole is generated in the rehabilitation pipe, it can be closed by the water stop reinforcement layer, which is excellent. Water-stopping property can be ensured. Moreover, the strength as a pipe | tube of a rehabilitation pipe | tube can be improved by forming the water stop reinforcement layer which the resin composition hardened | cured inside the renovation pipe | tube. Thereby, for example, even when the diameter of the existing pipe to be rehabilitated is large, the thickness of the lining material for forming the rehabilitated pipe can be suppressed, and the lining material can be easily introduced and cured. And speeding up.

The existing pipe rehabilitation method according to claim 2 is the existing pipe rehabilitation method according to claim 1, wherein the waterproofing reinforcing layer forming step includes:
It is carried out using an injection device having a nozzle for injecting the resin composition and a moving means capable of moving in the rehabilitation pipe,
The said injection apparatus performs the injection of the said resin composition, moving the inside of the said rehabilitation pipe | tube.

  According to this structure, by moving an injection apparatus within a rehabilitation pipe | tube, a resin composition can be injected in the inside of a rehabilitation pipe | tube, uniform injection is attained, and an injection operation | work becomes also easy.

  The existing pipe rehabilitation method according to claim 3 is the existing pipe rehabilitation method according to claim 2, wherein the injection device includes a rotation mechanism that rotates the nozzle in a circumferential direction of the rehabilitation pipe. The method is performed while rotating the nozzle. By rotating the nozzle and spraying the resin composition on the entire inner peripheral surface of the rehabilitation pipe, it is possible to ensure a more uniform thickness of the waterstop reinforcing layer.

  The existing pipe rehabilitation method according to claim 4 is the existing pipe rehabilitation method according to claim 2 or 3, wherein the injection device includes an angle adjustment mechanism capable of adjusting an injection angle of the nozzle. It is performed while adjusting the injection direction.

  By adjusting the spray angle, it is possible to adjust the time until the resin composition sprayed from the nozzle reaches the inner peripheral surface of the rehabilitation pipe. Since the resin composition to be used is a type that cures over time, the resin composition can be cured appropriately by adjusting the time from injection until it reaches the rehabilitation pipe, and sufficient strength can be maintained. A water reinforcing layer can be formed.

  The existing pipe rehabilitation method according to claim 5 is the existing pipe rehabilitation method according to any one of claims 1 to 4, wherein the injection is performed in the rehabilitation pipe when injection is performed by the injection device. A gas flow in a direction opposite to the moving direction of the apparatus is formed.

  According to this configuration, it is possible to adjust the time until the components contained in the resin composition injected from the nozzle react with each other and cure, by forming a gas flow. Accordingly, it is possible to prevent the resin composition from being cured earlier than intended, and the resin composition can be appropriately cured.

  The existing pipe rehabilitation method according to claim 6 is the existing pipe rehabilitation method according to any one of claims 1 to 5, wherein the resin composition is a polyurea forming resin composition or a polyurethane forming resin composition. It is characterized by being. Polyureta and polyurethane not only have excellent strength and water-stopping properties, but also have excellent wear resistance, acid resistance, and alkali resistance. Therefore, it is possible to provide a rehabilitation method particularly useful for a pipe through which a large amount of solids flows and a pipe through which chemical wastewater flows.

  The existing pipe rehabilitation method according to claim 7 is the existing pipe rehabilitation method according to any one of claims 1 to 6, after the rehabilitation pipe installation step and before the waterstop reinforcement layer formation step. A step of forming irregularities on the inner peripheral surface of the rehabilitation pipe.

  According to this configuration, by forming irregularities on the inner peripheral surface of the rehabilitated pipe, the surface area of the inner peripheral surface is increased, thereby improving the adhesion between the inner peripheral surface of the rehabilitated pipe and the resin composition to be injected. It becomes possible to make it.

  The existing pipe rehabilitation method according to claim 8 is the existing pipe rehabilitation method according to claim 7, wherein the unevenness forming step is movable in the rehabilitation pipe and forms unevenness on an inner peripheral surface of the rehabilitation pipe. The unevenness forming apparatus equipped with a brush capable of rotating in the circumferential direction is formed, and the unevenness is formed in the circumferential direction along the inner peripheral surface of the rehabilitation pipe while the unevenness forming apparatus is moving. It is characterized by being carried out while being rotatable. According to this configuration, it is possible to efficiently form the unevenness with the brush that is rotatable in the circumferential direction.

  Furthermore, the above-mentioned object is a rehabilitation pipe formed on the inner side of an existing pipe, and a waterstop reinforcing layer formed on the inner peripheral surface of the rehabilitation pipe and made of a cured product of a resin composition that is cured with time, This is achieved by an existing pipe rehabilitation structure having The water-stop reinforcing layer is preferably made of polyurea or polyurethane, thereby providing an existing pipe rehabilitation structure that is excellent in terms of water-stopping and reinforcing properties.

  According to the present invention, it is possible to sufficiently ensure the tube strength after rehabilitation by forming a water-stop reinforcing layer made of a cured resin composition that is cured with time on the inner peripheral surface of the rehabilitated tube. Thus, it is possible to provide a rehabilitation method and a rehabilitation structure for an existing pipe having excellent water stoppage.

It is explanatory drawing which shows the resin-made rehabilitation pipe | tube installation process. It is explanatory drawing which shows an uneven | corrugated formation process. FIG. 3 is a detailed view of a main part of FIG. 2. It is explanatory drawing which shows a water stop reinforcement layer formation process. FIG. 5 is a detailed view of a main part of FIG. 4.

  Hereinafter, the present invention will be described in detail with reference to the drawings. In the following embodiments, a sewage pipe will be described as an example of an existing pipe, but the present invention can be applied not only to a sewage pipe but also to any existing pipe. FIG. 1 is an explanatory view of a rehabilitation tube forming process. The rehabilitation process itself may be performed in the same manner as before.

  That is, after introducing the tubular lining material 10 into the sewage pipe (sewer main pipe) 100 arranged between the manholes 102-1 and 102-2, both ends thereof are closed by the closing members 62-1 and 62-2. Block. Compressed air is introduced from the working device 66 through the hose 68 into the closed space 70 thus formed, the tubular lining material 10 is expanded in diameter, and the outer peripheral surface thereof is brought into contact with the inner peripheral surface of the sewer pipe 100.

  Then, the curable resin composition contained in the lining material 10 is cured by irradiating the lining material 10 with light from the inside of the lining material 10 by the lamp coupling body 60, and the lining material 10 is disposed inside the sewer pipe 100. A hardened rehabilitation tube is formed. The lamp coupling body 60 can be moved by pulling the inside of the lining material 10 with a cable 64.

  In the drawing, reference numeral 90 denotes a blocking member that blocks the flow of sewage. Reference numerals 66 and 72 denote work devices. Air is supplied from the work device 66 to the closed space 70 via the hose 68 and is discharged from the hose 74, so that air flows in the sealed space 70. , Flammable substances are being discharged.

  The lining material 10 may be a conventionally used material. For example, a fiber base material (for example, a nonwoven fabric such as a glass fiber mat or felt) impregnated with a curable resin composition, and if necessary, What has the inner film and outer film which are provided in order to protect the inner surface and outer surface of the tubular thing is used.

  In the example shown in FIG. 1, a lining material impregnated with a photocurable resin composition that is cured by light is shown. However, the curable resin composition may be a thermosetting resin composition that is cured by heat. Any curable resin composition can be used in which a polymerizable resin such as vinyl ester resin or unsaturated polyester resin is dissolved in a solvent such as styrene. In the case of a photocurable resin composition, an azo compound or the like In the case of a thermosetting resin composition, an organic peroxide that reacts with heat is blended. When the thermosetting resin composition is used, the curing operation is not performed by light irradiation but by heating the lining material.

  The inner film and the outer film may be those conventionally used for producing a tubular lining material. For example, a polyethylene film, a polypropylene film, a polyethylene terephthalate film, or the like can be used. When the curable resin composition is a photocurable resin composition, an inner film having transparency to the irradiated light is used. After the lining material is cured, the inner film is peeled off.

  Next, the uneven | corrugated formation process performed as needed after the rehabilitation pipe | tube formation process is demonstrated. FIG. 2 is an explanatory view of the concavo-convex forming step, and FIG. 3 is a detailed view of the main part of FIG. In the concavo-convex forming step, first, a device for forming fine concavo-convex on the inner peripheral surface of the rehabilitation pipe is arranged. That is, an unevenness forming apparatus 30 for forming unevenness is disposed in the rehabilitation pipe 20. In the present embodiment, the unevenness forming apparatus 30 also has a primer injection function. The injection of the primer is performed on the inner peripheral surface 20a of the rehabilitation pipe 20 as necessary in order to improve the adhesion between the rehabilitation pipe 20 and a water blocking functional layer described later. A supply device 40 for supplying the primer to the unevenness forming device 30 is arranged on the ground.

  In the vicinity of the supply device 40, containers 42A and 42B containing components of a resin composition for forming a water-stopping functional layer to be described later, a container 42C containing a primer, and for supplying compressed air A compressor 42D is placed. In the concavo-convex forming step, the primer and the compressed air are sent from the container 42C and the compressor 42D to the concavo-convex forming apparatus 30 via the hose / cable assembly 44 by the supply device 40.

  As shown in FIG. 3, the unevenness forming apparatus 30 is provided with a brush 36 for forming unevenness on the inner peripheral surface 20 a of the rehabilitation pipe 20. A shaft portion 38 is attached to the main body portion 31 of the unevenness forming apparatus 30, and the brush 36 is attached to the shaft portion 38. The shaft portion 38 is configured to be rotatable by the rotation mechanism 37 in the circumferential direction of the rehabilitated tube 20 with respect to the axis C (that is, in the direction of the arrow 300). Accordingly, the brush 36 is configured to be rotatable in the circumferential direction along the inner peripheral surface 20a of the rehabilitated pipe 20, and the inner peripheral surface 20a of the rehabilitated pipe 20 is damaged by the rotation of the brush 36. As a result, fine irregularities are formed.

  As a material constituting the brush 36, for example, a metal such as iron or stainless steel can be used. The inner peripheral surface 20a of the rehabilitated pipe 20 is often flat. By forming irregularities on the inner peripheral surface 20a of the rehabilitated pipe 20 before the water-stopped reinforcing layer forming process described later, the water-stopped reinforcing layer and the regenerated pipe are formed. Adhesiveness with 20 becomes good.

  In addition, the unevenness forming device 30 is provided with a nozzle 32, and a primer is sprayed to the inner peripheral surface 20 a of the rehabilitation pipe 20 through the nozzle 32. The nozzle 32 can also be rotated in the circumferential direction of the rehabilitation pipe 20 (that is, in the direction of the arrow 300) with respect to the axis C by the rotation mechanism 37 described above. The primer is applied to the entire inner peripheral surface 20a of the rehabilitation pipe 20 by jetting the primer from the jet port 32a of the nozzle 32 while rotating in this way.

  The injection device 30 is provided with wheels 34 and is configured to be able to move in the rehabilitation pipe 20 by self-propelling or towing. The rehabilitation pipe is formed while forming irregularities by the brush 36 and injecting the primer. 20 moves from one end 20a side to the other end 20b side (that is, in the direction of arrow 200). As described above, the unevenness forming step is completed.

  Next, the water stop reinforcing layer forming step will be described. FIG. 4 is an explanatory view of the water-stop reinforcing layer forming step, and FIG. 5 is a detailed view of the main part of FIG. In the water stop reinforcement layer forming step, first, an injection device 50 for injecting a resin composition that forms the water stop reinforcement layer is disposed in the rehabilitation pipe 20. Components of the resin composition and compressed air are sent to the injection device 50 through the hose and cable assembly 44 from the containers 42A and 42B and the compressor 42D arranged on the ground.

  The injection device 50 is provided with a nozzle 52, and the resin composition is injected onto the inner peripheral surface 20 a of the rehabilitation pipe 20 through the nozzle 52. Further, the injection device 50 is provided with wheels 54, and is configured to be able to move in the rehabilitation pipe 20 by self-propelling or towing.

  In the present embodiment, first, the injection device 50 is disposed so as to be positioned near the one end 20a in the rehabilitation pipe 20a. Then, while injecting the resin composition from the injection device 50 onto the inner peripheral surface 20a of the rehabilitation pipe 20, the injection device 50 moves toward the other end 20b of the rehabilitation pipe 20 (in the direction of the arrow 200). The sprayed resin composition hardens over time and forms a water stop reinforcing layer 58.

  The nozzle 52 is attached to the main body 51 of the injection device 50 via a rotation mechanism 57, and the nozzle 52 can be rotated in the circumferential direction (that is, in the direction of the arrow 300) with respect to the axis C by the rotation mechanism 57. It is configured. Thereby, the resin composition can be sprayed to the entire inner peripheral surface 20a of the rehabilitation pipe 20. This rotation may be rotation that alternately performs forward rotation and reverse rotation, or may be rotation that continues forward rotation.

  The resin composition to be sprayed is a resin composition that cures with time. For example, it is preferable to use a polyurea-forming resin composition or a polyurethane-forming resin composition. In the case of the polyurea forming resin composition, for example, the polyamine component is stored in the container 42-1 and the polyisocyanate component is stored in the container 42-2, and is separately supplied to the injection device 30 via the supply device 40. Thereafter, the polyamine component and the polyisocyanate component begin to be mixed immediately before injection. Polyurea and polyurethane are excellent in acid resistance, alkali resistance, chemical resistance, and abrasion resistance. Polyurea is particularly preferable from the viewpoints of these advantages and the problems and effects of the present invention.

  In the injection device 50, the injection angle of the resin composition injected from the nozzle 52 is configured to be adjustable. That is, the angle α of the tube portion 52b having the nozzle 52's outlet 52a with respect to the axis C of the rehabilitated tube 20 can be adjusted. The angle α is preferably more than 0 ° and not more than 90 °, particularly preferably 30 to 60 °. The nozzle 52 is provided with an angle adjusting mechanism (not shown) of the pipe portion 52b, and thereby the injection angle α can be adjusted. In addition, an injection direction is an angle of the center of the resin composition discharged | emitted from the jet nozzle 52a.

  By making the injection angle adjustable, the resin composition is cured before the injected composition reaches the inner peripheral surface 20a of the rehabilitation pipe 20 and sufficiently mixed with the components in the resin composition. An object can be prevented from reaching the inner peripheral surface 20a of the rehabilitation pipe 20.

  That is, when the pipe diameters of the existing pipe 100 and the renovated pipe 20 are large and the distance from the injection port 52a of the nozzle 52 to the inner peripheral surface 20a of the renovated pipe 20 is long, the resin composition injected from the nozzle 52 is When there is a possibility of hardening before reaching the inner peripheral surface 20a of the rehabilitated pipe 20, the distance from the injection port 52a of the nozzle 52 to the inner peripheral surface 20a of the rehabilitated pipe 20 is set by increasing the injection angle α. It can be shortened and can reach the inner peripheral surface of the rehabilitation pipe 20 before the resin composition is cured.

  Also, two types of components (hereinafter referred to as A liquid and B liquid) supplied from the container 42A and the container 42B are supplied separately without being mixed up to the nozzle 52 of the injection device 50, and immediately before being injected. Both begin to mix and are sufficiently mixed with each other while being jetted. Therefore, the pipe diameters of the existing pipe 100 and the rehabilitation pipe 20 are small, and the distance from the injection port 52a of the nozzle 52 to the inner peripheral surface 20a of the rehabilitation pipe 20 is short, and the resin composition injected from the nozzle 52 is When there is a possibility that the liquid A and the liquid B are not sufficiently mixed before reaching the inner peripheral surface 20a of the rehabilitation pipe 20, the rehabilitation is performed from the injection port 52a of the nozzle 52 by setting the injection angle α small. The distance to the inner peripheral surface 20a of the pipe 20 is increased, and before the injected A liquid and B liquid reach the inner peripheral surface 20a of the rehabilitated pipe 20, both can be mixed sufficiently.

  In the waterstop reinforcement layer forming step, a gas flow may be formed in the rehabilitation pipe 20 from the other end 20b side of the rehabilitation pipe 20 toward the one end side 20a (in the direction of the arrow 400). Thereby, the time until the injected resin composition reaches the inner peripheral surface of the rehabilitation pipe 50 is increased in response to the flow of gas, so that the time until it reaches the rehabilitation pipe 50 is increased. The length of the resin composition can be increased, and the degree of curing of the resin composition can be optimized. In order to form this gas flow, a hose for sending the gas is arranged so that the discharge port is positioned in the vicinity of the other end 50b of the rehabilitation pipe 20, and then sent by sending compressed air from a compressor or the like. Can do.

  When the waterstop reinforcing layer forming step is completed as described above, the existing pipe rehabilitation method of the present invention is finished, and the existing pipe rehabilitation structure of the present invention is formed. In addition, this invention is applicable to the existing pipe | tube which has an internal diameter of about 150-1000 mm, for example. The thickness of the rehabilitation pipe is, for example, 3 to 15 mm, and the thickness of the waterstop reinforcing layer is, for example, 3 to 10 mm. The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Lining material 20 Rehabilitation pipe | tube 30 Concavity and convexity formation apparatus 32 Nozzle 34 Wheel 36 Brush 40 Supply apparatus 42A, 42B Resin component storage container 42C Primer storage container 42D Compressor 44 Hose and cable assembly 50 Injection apparatus 52 Nozzle 54 Wheel 58 Water stop reinforcement layer 60 Lamp assembly

Claims (10)

Rehabilitation of existing pipes
A rehabilitation pipe installation step of installing a rehabilitation pipe inside the existing pipe;
Forming a waterstop reinforcement layer on the inner peripheral surface of the rehabilitation pipe by spraying a resin composition that cures with time, and forming a waterstop reinforcement layer on the inner side of the rehabilitation pipe by curing the injected resin composition Process,
The existing pipe rehabilitation method characterized by including. The waterstop reinforcing layer forming step includes:
It is carried out using an injection device having a nozzle for injecting the resin composition and a moving means capable of moving in the rehabilitation pipe,
2. The existing pipe rehabilitation method according to claim 1, wherein the injection device performs injection of the resin composition while moving in the rehabilitation pipe. The injection device has a rotation mechanism for rotating the nozzle in the circumferential direction of the rehabilitation pipe,
The existing pipe rehabilitation method according to claim 2, wherein the injection is performed while rotating the nozzle. The injection device has an angle adjustment mechanism capable of adjusting an injection angle of the nozzle,
The existing pipe rehabilitation method according to claim 2 or 3, wherein the injection is performed while adjusting an injection direction.   5. The gas flow according to claim 1, wherein a gas flow in a direction opposite to a moving direction of the injection device is formed in the rehabilitation pipe when injection is performed by the injection device. The existing pipe rehabilitation method described.   The existing pipe rehabilitation method according to any one of claims 1 to 5, wherein the resin composition is a polyurea forming resin composition or a polyurethane forming resin composition. After the rehabilitation pipe installation process, before the water stop reinforcement layer forming process,
An unevenness forming step for forming unevenness on the inner peripheral surface of the rehabilitation pipe,
The existing pipe rehabilitation method according to any one of claims 1 to 6, characterized by comprising: The concavo-convex forming step is performed by an concavo-convex forming apparatus equipped with a brush that is movable in the rehabilitation pipe and capable of forming a concavo-convex on the inner peripheral surface of the rehabilitation pipe so as to be rotatable in the circumferential direction.
8. The existing pipe rehabilitation according to claim 7, wherein the unevenness is formed while rotating the brush along the inner peripheral surface of the rehabilitation pipe during the movement of the unevenness forming apparatus. Method. Rehabilitation pipe formed inside the existing pipe,
An existing pipe rehabilitation structure comprising: a waterstop reinforcing layer formed on the inner peripheral surface of the rehabilitation pipe and made of a cured product of a resin composition that is cured with time.   The existing pipe rehabilitation structure according to claim 9, wherein the water stop reinforcing layer is made of polyurea or polyurethane.

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