JP6918301B2 - Existing pipe rehabilitation method - Google Patents

Description

The present invention relates to the existing pipe rehabilitation how.

Existing pipes such as sewage pipes have deteriorated due to long-term use, and their useful life is generally about 50 years. Therefore, the number of sewage pipes that have exceeded their useful life is increasing year by year. In particular, aged sewer pipes are deformed and cracked, which not only reduces the flow function of sewage, but also causes cavities in the ground due to the inflow of groundwater and earth and sand around the sewer pipes into the sewer pipes. It is also the cause of the ground collapse. In addition, sewage pipes buried underground are susceptible to ground movements such as earthquakes, and the current situation is that some kind of repair is required at a predetermined time.

As a method of rehabilitating an existing pipe, a method of covering the inner surface of the existing pipe with a lining material is known. As such a method, for example, the method described in Patent Document 1 is known, and in this method, it is produced by impregnating a fiber material such as glass fiber with a curable resin composition that is cured by light or heat. After introducing the tubular lining material 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 a closed space formed by closing both ends of the lining material. The lining material is cured by light or heat. As a result, the existing pipe is rehabilitated by forming a resin rehabilitation pipe inside the existing pipe.

Japanese Unexamined Patent Publication No. 2001-260223

In the lining material used in the above repair method, minute bubbles may remain inside during the manufacturing (impregnation) process, and this causes tiny pinholes to occur in the rehabilitation tube. There is. If a pinhole occurs, it may not be possible to secure water stoppage, and groundwater or earth and sand may flow into the pipeline from the outside of the existing pipe.

Further, as the diameter of the existing pipe to be rehabilitated becomes larger, it is necessary to increase the thickness of the lining material in order to secure an appropriate strength of the rehabilitated pipe. However, if the thickness of the lining material is increased, the weight is also increased accordingly, which may hinder the work of introducing the lining material into the existing pipe. Further, when a lining material impregnated with a photocurable resin composition is used, if the thickness thereof is increased, the light may not sufficiently penetrate into the inside during light irradiation, and the curing may be insufficient.

Therefore, an object of the present invention is to provide a rehabilitation method and a rehabilitation structure of an existing pipe which can sufficiently secure the pipe strength after rehabilitation and has excellent water stopping property.

Existing pipe rehabilitation method for order to solve the above object,
The rehabilitation pipe installation process of installing the rehabilitation pipe inside the existing pipe, and
A resin composition that cures over time is sprayed onto the inner peripheral surface of the rehabilitation pipe, and the sprayed resin composition is cured to form a water-stopping reinforcing layer that forms a water-stopping reinforcing layer inside the rehabilitation pipe. Process and
It is characterized by including.

According to this configuration, by further providing a waterproof reinforcing layer inside the rehabilitation pipe, if a pinhole is generated in the rehabilitated pipe, it can be closed by the waterproof reinforcing layer, which is excellent. Water stoppage can be ensured. Further, the strength of the rehabilitation pipe as a pipe can be improved by forming the waterproof reinforcing layer in which the resin composition is cured inside the rehabilitation pipe. As a result, 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 introduction work and hardening work can be facilitated. It will be faster and faster.

In addition , the water-stop reinforcing layer forming step is performed.
This is performed by using an injection device having a nozzle for injecting the resin composition and a moving means capable of moving in the rehabilitation tube.
The injection device is characterized in that the resin composition is injected while moving in the rehabilitation tube.

According to this configuration, by moving the injection device inside the rehabilitation pipe, the resin composition can be injected all over the inside of the rehabilitation pipe, uniform injection becomes possible, and the injection work becomes easy.

Further , the injection device has a rotation mechanism for rotating the nozzle in the circumferential direction of the rehabilitation pipe, and the injection is performed while rotating the nozzle. By rotating the nozzle and spraying the resin composition over the entire inner peripheral surface of the rehabilitation pipe, a more uniform thickness of the waterproof reinforcing layer can be ensured.

Further , the injection device has an angle adjusting mechanism capable of adjusting the injection angle of the nozzle, and the injection is performed while adjusting the injection direction.

Since the injection angle can be adjusted, the time required for the resin composition injected from the nozzle to reach the inner peripheral surface of the rehabilitation tube can be adjusted. Since the resin composition used is a type that cures over time, the time from injection to reaching the rehabilitation tube can be adjusted, so that the resin composition can be appropriately cured and the strength is sufficiently stopped. It becomes possible to form a water reinforcing layer.

Further , when injection is performed by the injection device, a gas flow is formed in the rehabilitation pipe in a direction opposite to the moving direction of the injection device.

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

Further , the resin composition is characterized by being a polyurea-forming resin composition or a polyurethane-forming resin composition. Polyurethane A and polyurethane, not only excellent in strength and water cut, is excellent in abrasion resistance and acid resistance, alkali resistance. Therefore, it is possible to provide a rehabilitation method particularly useful for a pipe through which a large amount of solid matter flows or a pipe through which chemical wastewater flows.

Further , after the rehabilitation pipe installation step and before the water blocking reinforcement layer forming step, a concavo-convex forming step of forming irregularities on the inner peripheral surface of the rehabilitation pipe is included.

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

Further , the unevenness forming step is performed by an unevenness forming device provided with a brush capable of forming irregularities on the inner peripheral surface of the rehabilitation tube so as to be rotatable in the circumferential direction. The unevenness is formed while the brush is rotated along the inner peripheral surface of the rehabilitation tube in the circumferential direction while the unevenness forming apparatus is moving. According to this configuration, unevenness can be efficiently formed by a brush that can rotate in the circumferential direction.

Further, the above object is to provide a water-stopping reinforcing layer made of a rehabilitated pipe formed inside the existing pipe and a cured product of a resin composition that is formed on the inner peripheral surface of the rehabilitated pipe and is cured over time. Achieved by the existing pipe rehabilitation structure with. The water-stopping reinforcing layer is preferably made of polyurea or polyurethane, which can provide an existing pipe rehabilitation structure excellent in water-stopping and reinforcing properties.

According to the present invention, by forming a waterproof reinforcing layer made of a cured product of a resin composition that cures over time on the inner peripheral surface of the rehabilitated pipe, it is possible to sufficiently secure the pipe strength after rehabilitation. , it is possible to provide a rehabilitation how the existing pipe having excellent water-stopping.

It is explanatory drawing which shows the process of installing a resin rehabilitation pipe. It is explanatory drawing which shows the unevenness forming process. It is a detailed view of the main part of FIG. It is explanatory drawing which shows the water-stopping reinforcement layer forming process. It is a detailed view of the main part of FIG.

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

That is, after introducing the tubular lining material 10 into the sewer pipe (sewer main) 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 formed thereby, the diameter of the tubular lining material 10 is expanded, and the outer peripheral surface thereof is brought into contact with the inner peripheral surface of the sewer pipe 100.

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

In the figure, reference numeral 90 is a damming member that blocks the flow of sewage. Reference numerals 66 and 72 are working devices, and air is supplied from the working device 66 to the closed space 70 via the hose 68 and discharged from the hose 74, so that an air flow is generated in the closed space 70. , Combustible substances are being discharged.

The lining material 10 may be a conventionally used one, for example, a tubular material in which a fiber base material (for example, a non-woven fabric such as a glass fiber mat or felt) is impregnated with a curable resin composition, and if necessary. Those having an inner film and an outer film provided to protect the inner and outer surfaces of the tubular object are used.

In the example shown in FIG. 1, a lining material impregnated with a photocurable resin composition that is cured by light is shown, but the curable resin composition may be a thermosetting resin composition that is cured by heat. For any of the curable resin compositions, a polymerizable resin such as a vinyl ester resin or an unsaturated polyester resin dissolved in a solvent such as styrene can be used, and in the case of a photocurable resin composition, an azo compound or the like can be used. 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 performed by heating the lining material instead of irradiating with light.

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. The inner film is peeled off after the lining material is cured.

Next, the unevenness forming step performed as needed after the rehabilitation tube forming step will be described. FIG. 2 is an explanatory view of the unevenness forming process, and FIG. 3 is a detailed view of a main part of FIG. In the unevenness forming step, first, a device for forming fine unevenness is arranged on the inner peripheral surface of the rehabilitation tube. That is, the unevenness forming device 30 for forming the unevenness is arranged in the rehabilitation pipe 20. In the present embodiment, the unevenness forming apparatus 30 also has a primer injection function. The primer is sprayed onto the inner peripheral surface 20a of the rehabilitation pipe 20 as necessary in order to improve the adhesiveness between the rehabilitation pipe 20 and the water blocking function layer described later. A supply device 40 for supplying a 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 the components of the resin composition for forming the water blocking function layer described later, containers 42C containing the primer, and compressed air for supplying compressed air. The compressor 42D is placed. In the unevenness forming step, the primer and compressed air are sent from the container 42C and the compressor 42D to the unevenness forming device 30 by the supply device 40 via the hose / cable assembly 44.

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

As the 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 rehabilitation pipe 20 is often flat, and the water blocking reinforcement layer and the rehabilitation pipe are formed by forming irregularities on the inner peripheral surface 20a of the rehabilitation pipe 20 before the water blocking reinforcing layer forming step described later. Adhesion with 20 becomes good.

Further, the unevenness forming device 30 is provided with a nozzle 32, and the primer is injected onto the inner peripheral surface 20a of the rehabilitation tube 20 via the nozzle 32. The nozzle 32 can also be rotated in the circumferential direction of the rehabilitation tube 20 (that is, in the direction of the arrow 300) with the axis C as a reference by the rotation mechanism 37. By injecting the primer from the ejection port 32a of the nozzle 32 while rotating in this way, the primer is applied to the entire inner peripheral surface 20a of the rehabilitation tube 20.

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 traction, and the rehabilitation pipe is formed while forming irregularities by the brush 36 and injecting the primer. The inside of 20 is moved 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 process of forming the waterproof reinforcing layer will be described. FIG. 4 is an explanatory view of a water blocking reinforcement layer forming step, and FIG. 5 is a detailed view of a main part of FIG. In the water blocking reinforcement layer forming step, first, an injection device 50 for injecting the resin composition forming the water blocking reinforcing layer is arranged in the rehabilitation pipe 20. The components of the resin composition and compressed air are sent from the containers 42A and 42B and the compressor 42D arranged on the ground to the injection device 50 via the hose / cable assembly 44.

The injection device 50 is provided with a nozzle 52, and the resin composition is injected onto the inner peripheral surface 20a of the rehabilitation pipe 20 via 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 traction.

In the present embodiment, first, the injection device 50 is arranged so as to be located near 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 to form the waterproof reinforcing layer 58.

The nozzle 52 is attached to the main body 51 of the injection device 50 via the rotation mechanism 57, so that 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 in. As a result, the resin composition can be sprayed onto the entire surface of the inner peripheral surface 20a of the rehabilitation pipe 20. This rotation may be a rotation in which forward rotation and reverse rotation are alternately performed, or a rotation in which forward rotation is continuously performed.

The injected resin composition is a resin composition that cures over time. As an example, it is preferable to use a resin composition for forming polyurea or a resin composition for forming polyurethane. 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 4-2, and each is separately supplied to the injection device 30 via the supply device 40. After that, just before the injection, the polyamine component and the polyisocyanate component begin to mix. Polyurea and polyurethane are excellent in acid resistance, alkali resistance, chemical resistance, and abrasion resistance. In particular, polyurea is preferable in terms 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 pipe portion 52b having the nozzle 52 of the nozzle 52 with respect to the axis C of the rehabilitation pipe 20 can be adjusted. The angle α is preferably more than 0 ° and 90 ° or less, and particularly preferably 30 to 60 °. The nozzle 52 is provided with an angle adjusting mechanism (not shown) of the pipe portion 52b, whereby the injection angle α can be adjusted. The injection direction is the angle of the center of the resin composition discharged from the ejection port 52a.

By making the injection angle adjustable, the injected composition is cured before reaching the inner peripheral surface 20a of the rehabilitation tube 20, and the resin composition is made before the components in the resin composition are sufficiently mixed. It is possible to prevent an object 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 rehabilitation pipe 20 are large and the distance from the injection port 52a of the nozzle 52 to the inner peripheral surface 20a of the rehabilitation pipe 20 is long, the resin composition injected from the nozzle 52 is If there is a risk of hardening before reaching the inner peripheral surface 20a of the rehabilitation pipe 20, by setting the injection angle α large, the distance from the injection port 52a of the nozzle 52 to the inner peripheral surface 20a of the rehabilitation pipe 20 can be increased. It can be shortened so that it can reach the inner peripheral surface of the rehabilitation tube 20 before the resin composition is cured.

Further, the two types of components (hereinafter, referred to as liquid A and liquid B) supplied from the container 42A and the container 42B are separately supplied to the nozzle 52 of the injection device 50 without being mixed, and immediately before injection. The two begin to mix at, and are well mixed with each other while being injected. Therefore, when 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, the resin composition sprayed from the nozzle 52 is produced. If there is a risk that the liquid A and the liquid B will not be sufficiently mixed before reaching the inner peripheral surface 20a of the rehabilitation pipe 20, the injection angle α can be set small to rehabilitate the nozzle 52 from the injection port 52a. The distance to the inner peripheral surface 20a of the pipe 20 is increased, and the injected liquids A and B can be sufficiently mixed before reaching the inner peripheral surface 20a of the rehabilitation pipe 20.

In the water blocking 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 arrow 400). As a result, the time required for the injected resin composition to reach the inner peripheral surface of the rehabilitation pipe 50 becomes longer due to the flow of gas, so that the time required for the injected resin composition to reach the rehabilitation pipe 50 is increased. It can be lengthened, 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 located near the other end 50b of the rehabilitation pipe 20, and then compressed air is sent from a compressor or the like. Can be done.

When the water blocking reinforcement layer forming step is completed as described above, the existing pipe rehabilitation method of the present invention is completed, and the existing pipe rehabilitation structure of the present invention is formed. The present invention can be applied to an existing pipe having an inner diameter of, for example, about 150 to 1000 mm. The thickness of the rehabilitation pipe is, for example, 3 to 15 mm, and the thickness of the waterproof 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 exceeding the gist of the present invention.

10 Lining material 20 Rehabilitation pipe 30 Concavo-convex forming device 32 Nozzle 34 Wheel 36 Brush 40 Supply device 42A, 42B Resin component storage container 42C Primer storage container 42D Compressor 44 Hose / cable assembly 50 Injection device 52 Nozzle 54 Wheel 58 Water stop reinforcement layer 60 lamp connector

Claims (7)

It is a method of rehabilitating existing pipes.
The rehabilitation pipe installation process of installing the rehabilitation pipe inside the existing pipe, and
A resin composition that is cured over time is injected onto the inner peripheral surface of the rehabilitation pipe from an injection device that is moved in the rehabilitation pipe, and the sprayed resin composition is cured to stop water inside the rehabilitation pipe. The process of forming a waterproof reinforcing layer to form a reinforcing layer, and
Including
An existing pipe rehabilitation method, characterized in that a gas flow in a direction opposite to the moving direction of the injection device is formed in the rehabilitation pipe when injection is performed by the injection device. The waterproof reinforcing layer forming step is
This is performed by using an injection device having a nozzle for injecting the resin composition and a moving means capable of moving in the rehabilitation tube.
The existing pipe rehabilitation method according to claim 1, wherein the injection device injects 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 tube.
The existing pipe rehabilitation method according to claim 2, wherein the injection is performed while rotating the nozzle. The injection device has an angle adjusting mechanism capable of adjusting the injection angle of the nozzle.
The existing pipe rehabilitation method according to claim 2 or 3, wherein the injection is performed while adjusting the injection direction. The existing pipe rehabilitation method according to any one of claims 1 to 4, wherein the resin composition is a polyurea-forming resin composition or a polyurethane-forming resin composition. After the rehabilitation pipe installation step and before the waterproof reinforcement layer forming step,
Unevenness forming step of forming unevenness on the inner peripheral surface of the rehabilitation tube,
The existing pipe rehabilitation method according to any one of claims 1 to 5, wherein the method comprises. The unevenness forming step is performed by an unevenness forming apparatus provided with a brush that is movable in the rehabilitation tube and capable of forming unevenness on the inner peripheral surface of the rehabilitation tube so as to be rotatable in the circumferential direction.
The existing pipe rehabilitation according to claim 6, wherein the formation of the unevenness is performed while the brush is rotated along the inner peripheral surface of the rehabilitation pipe in the circumferential direction while the unevenness forming apparatus is moving. Method.

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