KR100903794B1 - Non-digging type repairing method for pipelines - Google Patents

Abstract

A non-digging pipeline repairing method is provided to obtain additional reinforcement effect in a cracked portion of a pipeline by injecting polyurea through a first injecting step and a second injecting step. According to a non-digging pipeline repairing method, a polyurea pipe is inserted into a pipeline(S120). A prior injection pipe and a post injection pipe are inserted into a space between the polyurea pipe and the pipeline(S140). The polyurea is firstly injected through the prior injection pipe(S150). The polyurea is secondly injected through the post injection pipe. The filled polyurea is solidified(S160).

Description

NON-DIGGING TYPE REPAIRING METHOD FOR PIPELINES}

The present invention relates to a non-drilling conduit repair method. More specifically, the present invention relates to a non-excavated pipeline repair method using polyurea that can repair underground pipelines that are environmentally friendly and low cost in a short time.

Conventionally, hot water is introduced into the reinforcing tube after inserting it while reversing the reinforcing tube impregnated with thermosetting resin in the tube (nonwoven fabric) coated on one side into the old pipeline without digging the underground pipe and industrial pipe. Non-excavation pipeline repairing methods and apparatuses have been most commonly used to supply solidified curable resins so that the surface impregnated with the thermosetting resin is integrated with the inner surface of the aging pipeline.

Korean Patent Laid-Open No. 2003-0042159 discloses a step of attaching a second sheet formed by impregnating a resin into a polyester felt paper in a form surrounding the unmanned machine and applying an adhesive material to the unvulcanized rubber sheet on the second sheet. It discloses a method for reinforcing a conduit by mounting the first sheet in a wrapping form and attaching the first and second sheets which are stacked and integrated to cracks and breakage portions inside the pipe. In the process of making the first sheet, the adhesive material (aka primer) is uniformly applied to the unvulcanized rubber sheet by using a roller. In addition, when the second sheet is manufactured, the second sheet is manufactured by evenly impregnating the adhesive resin on the polyester felt using a brush. The processes for manufacturing the first sheet and the second sheet are all performed by hand, which not only lowers the productivity but also increases the manufacturing cost. In addition, the adhesive resin tends to be reluctant because organic solvents harmful to the human body and crosslinking agents that cause odors are used, and the physical impact on the environment is large.

Korean Patent No. 10-0433060 discloses a non-drilling conduit repairing apparatus and method as follows. Load the reversing device in the vehicle, the reversing device can rotate left and right by the gear receiving the rotational force of the motor, the reversing device is installed inside the drum to wrap the wire tied to the front end of the reinforcing tube and reinforcement The tube is wound up, and the tip of the reinforcing tube is inserted into the outlet of the inverter, and then fixed with a band. When water or wind is introduced into the inlet of the device, the reinforcing tube is turned upside down by water or wind, Will be fitted. In this case, the reinforcing tube is continuously discharged while the tip is inverted and tied to the discharge port, so that the reinforcing tube is inserted into the inner pipe line. In this state, hot water is introduced into the front end of the reinforcing tube by using the tube or When the warm air flows inward, the thermosetting resin impregnated in the reinforcement tube is cured and is integrated with the inner side of the pipeline.In this way, after the reinforcement tube is hardened and fixed integrally with the inner surface of the pipeline, it is reinforced according to the length of the pipeline. Cut out the tube and you're done. In this case, the reinforcement tube is installed from the outlet of the inverter to the inlet of the conduit, and the reinforcement tube cannot be reused when the thermosetting resin is cured. Waste expensive reinforcement tubes. And when the reinforcement tube is inverted, it is bent at the inlet of the pipeline, but if it is bent with only the reinforcement tube, the inside of the reinforcement tube is expanded so that it is not easily bent. There was a problem. In addition, the expansion side of the reinforcement tube is no longer pushed to the exit side of the pipe line should be fixed in the thermosetting work, but the pipe is subjected to the force to continue to protrude due to the internal expansion pressure of the reinforcement tube wire reinforcement tube Even if it holds the reinforcement tube was difficult to fix in a stable state. In addition, the existing reversing device is installed with the reinforcing tube wound and unwinding toward the rear of the vehicle, so that the usable reinforcing tube should use a size that does not exceed the width of the vehicle. The use of a wider vehicle should not be used, so the construction cost is high, and even after the construction of the reinforcement tube is completed, the role of the support to withstand the water pressure of the concrete had a slight problem.

It is possible to repair in a short time and low cost to compensate for the cost increase due to wasted reinforcing tubes in the conventional repair method using reinforcement tubes and work environment problems caused by the use of harmful organic solvents and crosslinking agents. There is a need for a method of repairing an eco-friendly non-excavated pipeline that can be easily adjusted.

Accordingly, an object of the present invention is to provide a repair method of an environmentally friendly unexcavated pipeline.

According to an embodiment of the present invention, a method for repairing an unexcavated pipe line according to an embodiment includes inserting a polyurea pipe into a pipe and inserting a polyurea injection pipe into a space between the pipe and the polyurea pipe. Polyurea is injected through the polyurea injection tube and the injected polyurea is cured.

As an example, the polyurea tube is formed by connecting a plurality of unit tube blocks, wherein the unit tube block includes a reinforcing grid and a polyurea layer applied to the reinforcing grid, and a part of the reinforcing grid is It has a shape protruding out of the polyurea layer.

As an example, the unit tube block is connected by attaching a polyurea film to the inner surface of two unit tube blocks connected to each other, and applying and curing an ultrafast curing polyurea to the outer surface.

According to an embodiment of the present invention, a non-excavated conduit repair method includes inserting a polyurea tube into a conduit, and inserting a pre-injection tube and a subsequent injection tube into a space between the conduit and the polyurea tube. . Polyurea is first injected through the pre-infusion tube and secondaryly injected through the subsequent infusion tube to fill and cure the filled polyurea.

As an example, the injection pressure of the polyurea injected in the primary injection and the secondary injection of the polyurea is equal to the air pressure filled in the polyurea tube.

As an example, the subsequent injection pipe has a discharge port and a blocking part to prevent foreign substances from flowing into the discharge hole, and the blocking part is opened by the injection pressure of the polyurea injected into the subsequent injection pipe.

As an example, the polyurea is injected through the subsequent infusion tube at the point when the first injected polyurea is touch cured.

As an example, the conduit is a concrete conduit.

According to the non-excavated pipeline repairing method using the polyurea of the present invention described above, by using the environmentally friendly and excellent properties of polyurea, it is applicable to the repair of water and sewage pipelines as well as industrial piping, and excellent economical efficiency by reducing the repair time Have

By forming the thickness of the polyurea pipe in consideration of the diameter and length of the pipe, and using it for repairing the pipe, it is possible to secure the standard thickness of the pipe and easily apply the amount of polyurea according to the distance between the polyurea pipe and the pipe. Can be adjusted.

In addition, by injecting polyurea through the first injection step and the second injection step, an additional reinforcement effect is obtained in the crack of the pipe line, and a subsequent injection pipe that is not removed in the second injection step has an additional support reinforcement effect.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the non-excavated water and sewage pipeline repair method according to embodiments of the present invention. However, the present invention is not limited to the following embodiments, and a person of ordinary skill in the art may implement the present invention in various other forms without departing from the technical spirit of the present invention.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. The singular forms “a,” “an” and “the” include plural expressions unless the context clearly indicates otherwise. It is to be understood that the combination is intended to be present, but not to exclude in advance the possibility of the presence or addition of one or more other features or numbers, steps, operations, components, parts or combinations thereof. Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Referring to the non-excavation pipeline repair method according to the embodiments of the present invention in detail.

Example 1

1 is a flow chart of a non-drilling pipeline repair process according to an embodiment of the present invention.

Referring to Figure 1, to prepare a polyurea tube (step S110).

Polyurea applied to the non-excavated pipeline repair method of the present invention is more wear resistant than general epoxy having about 600 mg / 1,000 cycles and general urethane having about 2000 mg / 1,000 cycles with abrasion resistance of about 60 to 100 mg / 1,000 cycles or less (ASTM D4060). ). Here, wear resistance is defined as the basis for predicting the tendency of the wear and shrinkage of the resin when it comes into contact with the friction agent, and is defined as the amount to be reduced while rubbing the abrasive while rotating the disc-shaped specimen in the rotating mechanism. After pressing the wear wheel on the specimen, the wear was made while rotating 1000 times, and the weight of the weighted specimen was measured in mg to indicate wear resistance. In addition, it has an elasticity and hardness at about 200 to 600% elongation and is excellent in impact resistance. Here, elongation = length change / original length x 100 is defined. Polyurea tube formed of polyurea having high elongation has high elasticity, and therefore, no damage occurs even when about 90 degrees of bending when inserted into the pipeline through a manhole on the ground. In addition, polyurea can be applied evenly under a non-catalytic reaction, and unlike epoxy resins and urethane resins, polyurea does not have a great influence on ambient moisture during construction. In addition, since the workability is under 50 ° C and minus 30 ° C, the ambient temperature is not significantly affected. And since it is low in fire and explosion risk when it is installed as solvent-free, the VOC content is zero or low, so it satisfies VOC regulations required for internal work of pipelines and meets drinking water regulations. Next, it is suitable not only for industrial piping but also for water and sewage pipeline internal repair work.

2 and 3 are perspective views of the structure of the unit tube block according to the embodiments of the present invention, Figure 4 is a cross-sectional view for explaining a method of connecting the unit tube block according to embodiments of the present invention.

Polyurea tube is formed by connecting the unit tube block as shown in FIG. The unit tube block is formed in the form of a tube by applying a polyurea on the outside of the reinforcing grid 10 (see Fig. 2), and a part of the reinforcing grid is formed so as to have a state protruding to the outside because it is not applied ( 3). This is to facilitate the connection of the polyurea tube when the unit tube block is connected to form the polyurea tube. For example, the unit tube block may be formed by coating a solvent-free polyurea of a urea spray type on the reinforcing grid 10 with a rim spray, and then coating the outside of the reinforcing grid 10 with polyurea and forming a tubular shape. . The unit tube block will include a polyurea layer applied to the reinforcing grid.

The thickness of the polyurea layer applied to the outside of the reinforcing grid 10 should have a thickness that will not cause damage even when the case is inserted into the pipe. If the thickness of the polyurea layer applied to the outside of the reinforcing grid 10 is too thin, the polyurea tube formed by the above method is easily broken at the time of insertion when inserted into the pipeline (step S120), too If thick, it is difficult to bend about 90 degrees. Therefore, the thickness of the polyurea layer applied to the outside of the reinforcing grid 10 is determined in consideration of this. For example, the thickness of the polyurea layer applied to the outside of the reinforcing grid 10 is about 0.5 to 1.0. has mm.

The diameter of the unit pipe block is determined in consideration of the diameter of the pipe line and the amount of polyurea to be applied. The amount of polyurea applied can be easily adjusted according to the gap 54 (see FIG. 8) between the conduit and the polyurea tube.

The length of the unit pipe block is determined in consideration of workability during field transfer and connection of the unit pipe block. If the length of the unit pipe block is too short, the workability is remarkably reduced due to the large number of joints. If the length of the unit pipe block is too long, field transfer becomes difficult, so this should be considered. For example, the length of the unit tube block may be about 5 to 10 m.

The unit tube block formed by the above method adheres the polyurea film 21 to the inner surface of two unit tube blocks 22 connected to each other as shown in FIG. 4, and to the outer surface of the unit tube blocks connected to each other. Super fast curing polyurea is applied to cure and connect. For example, the passive polyurea 20 is applied to both ends of the polyurea film 21 as an adhesive means, and then bonded to the inner surface of the unit pipe block 22 connected to each other, and then the unit pipe blocks connected to each other. A superfast curing polyurea is applied to the outer surface of (22) and surface trimmed to connect the polyurea tubes. A plurality of unit pipe blocks are connected according to the length of the pipe to be repaired to form a polyurea pipe.

The ultra-fast curing polyurea is a polyurea developed for application to a system using a polyurea discharge-only equipment capable of maintaining a high discharge pressure and a high discharge temperature, for example, has a relatively short pot life. The pot life is between 1 second and 1 minute. The passive polyurea is a polyurea developed to be applied at room temperature without using the polyurea ejection-only equipment, and has a relatively longer pot life than the ultra-fast curing polyurea, for example, about several minutes to about 1 hour. Take housework time. Here, the pot life is defined as the time for maintaining the fluidity suitable for use without gelation, curing, or the like when mixed to use a multi-part or more paint.

Referring to Figure 1, the polyurea tube formed by the method is inserted into the pipeline (step S120). After the insertion into the pipeline, the polyurea tube is fixed to the pipeline by a fixing device (step S130).

5 is a cross-sectional view illustrating a method for fixing a polyurea tube according to embodiments of the present invention. The polyurea tube is fixed by a fixing device 33 such as a fixture as shown in FIG. 5, and the pneumatic injection device 30 is fixed to the polyurea tube 31 when the polyurea tube 31 is fixed to the conduit 32. It can be fixed to connect with the inside of the urea tube. The pneumatic injection device 30 serves to prevent the polyurea tube from being crushed by the pressure difference due to the polyurea injection pressure during polyurea injection through the polyurea injection tube (step S150).

6 is a cross-sectional view for explaining the injection of polyurea through the polyurea injection tube according to the first embodiment of the present invention.

Referring to FIG. 1, after the polyurea tube is inserted into the conduit and fixed, the polyurea injection tube is inserted into the space between the conduit and the polyurea tube as shown in FIG. 6 (step S140). The polyurea injection tube includes a polyurea injection tube inlet and a polyurea injection tube outlet. Referring to FIG. 6, the pipes of the polyurea injection pipe inlet 40 and the polyurea injection pipe outlet 41 are respectively installed at opposite ends of the space between the pipe line 42 and the outside of the polyurea pipe 43. .

Referring to FIG. 1, the polyurea injection tube is inserted into a space between the conduit and the polyurea tube, and then polyurea is injected into the space through the polyurea injection tube (step S150). In this case, as shown in FIG. 6, the polyurea is connected to the conduit 42 and the polyurea tube 43 through the polyurea injection tube inlet 40 in a state in which both sides of the conduit to be repaired are sealed by the sealing device 44. Is injected into the space between. Maintaining an air pressure at the same pressure as the polyurea injection pressure through the pneumatic injection device to prevent the polyurea injection from being crushed by the polyurea injection pressure when the polyurea injection through the polyurea injection tube inlet 40 . For example, when the polyurea injection pressure is about 8 kgf / cm 2, the air pressure is also set to about 8 kgf / cm 2. The injected polyurea pushes out impurities such as water present in the pipeline through the polyurea injection tube outlet 41. When the injected polyurea emerges through the polyurea injection tube outlet 41, the injection of the polyurea is completed, and the polyurea injection tube inlet 40 and the polyurea injection tube outlet 41 are removed and sealed. Thereafter, the pre-injected polyurea is cured.

When the polyurea injected through the polyurea injection tube starts to harden, the fixing device is removed and the end is cleaned (step S170).

Example 2

7 is a flow chart of the unexcavated water and sewage pipeline repair process according to another embodiment of the present invention.

2 and 3 are perspective views of the structure of the unit tube block according to the embodiments of the present invention, Figure 4 is a cross-sectional view for explaining a method of connecting the unit tube block according to embodiments of the present invention.

Referring to FIG. 7, a polyurea tube is prepared (step S210). Polyurea tube is formed by connecting the unit tube block as shown in FIG. 2 and 3 are perspective views of the structure of the unit tube block according to the embodiments of the present invention, Figure 4 is a cross-sectional view for explaining a method of connecting the unit tube block according to embodiments of the present invention. The unit tube block is formed in the form of a tube by applying a polyurea on the outside of the reinforcing grid 10 (see Fig. 2), and a part of the reinforcing grid is formed so as to have a state protruding to the outside because it is not applied ( 3). This is to facilitate the connection of the polyurea tube when the unit tube block is connected to form the polyurea tube. For example, the unit tube block may be formed by coating a solvent-free polyurea of the reinforcing grid 10 with a rim spray, and then coating the outside of the reinforcing grid 10 with polyurea and forming a tubular shape. . The unit tube block will include a polyurea layer applied to the reinforcing grid.

The thickness of the polyurea layer applied to the outside of the reinforcing grid 10 should have a thickness that will not cause damage even when the case is inserted into the pipe. For example, the thickness of the polyurea layer applied to the outside of the reinforcing grid 10 has a thickness of 0.5 to 1.0mm.

The diameter of the unit tube block is determined in consideration of the diameter of the conduit and the amount of polyurea to be applied in the first injection through the following pre-injection pipe and the second injection through the subsequent injection pipe (steps S250 and S260). . The amount of polyurea applied can be easily adjusted according to the gap 54 (see FIG. 8) between the conduit and the polyurea tube.

The unit tube block is bonded to the polyurea film 21 on the inner surface of the two unit tube blocks 22 connected to each other as shown in Figure 4, the ultra-fast curing polyurea on the outer surface of the unit tube blocks connected to each other Apply by curing and connect. For example, the passive polyurea 20 is applied to both ends of the polyurea film 21 as an adhesive means, and then bonded to the inner surface of the unit pipe block 22 connected to each other, and then the unit pipe blocks connected to each other. A superfast curing polyurea is applied to the outer surface of (22) and surface trimmed to connect the polyurea tubes. A plurality of unit pipe blocks are connected according to the length of the pipe to be repaired to form a polyurea pipe. The ultrafast curing polyurea and the passive polyurea are substantially the same as those described in Example 1.

Referring to Figure 7, the polyurea tube formed by the method is inserted into the pipeline (step S220). After the polyurea tube is inserted into the pipeline, the polyurea tube is fixed to the pipeline by a fixing device (step S230).

5 is a cross-sectional view illustrating a method for fixing a polyurea tube according to embodiments of the present invention. The polyurea tube is fixed by a fixing device 33 such as a fixture as shown in FIG. 5, and the pneumatic injection device 30 is fixed to the polyurea tube 31 when the polyurea tube 31 is fixed to the conduit 32. It can be fixed to connect with the inside of the urea tube. The pneumatic injection device 30 serves to prevent the polyurea tube from being crushed due to the pressure difference due to the polyurea injection pressure during polyurea injection through the pre-injection pipe and the subsequent injection pipe (steps S250 and 260). do.

8 is a cross-sectional view showing a state in which the pre-injection tube and the subsequent injection tube according to the second embodiment of the present invention is inserted into the space between the conduit and the polyurea tube, Figure 9 is a pre-injection according to the second embodiment of the present invention Sectional drawing for demonstrating injection of polyurea through a tube.

Referring to FIG. 7, after inserting and fixing the polyurea tube into the conduit, as shown in FIG. 8, the pre-injection tubes 51 and 52 and the subsequent injection tube 53 are connected to the conduit 55 and the polyurea. It inserts into the space between the tubes 56 (step S240). The preinjection tubes 60, 61 (see FIG. 9) comprise a preinjection tube inlet 60 and a preinjection tube outlet 61. 9, the pipes of the pre-inlet tube inlet 60 and the pre-inlet tube outlet 61 are respectively installed at opposite ends of the space between the conduit 62 and the outside of the polyurea tube 63. The subsequent injection tube 53 is inserted into the space between the conduit 55 and the outside of the polyurea tube 56 (see FIG. 8).

10 is a perspective view of a subsequent injection tube structure according to Embodiment 2 of the present invention, and FIG. 11 is a perspective view and a cross-sectional view of a subsequent injection tube structure according to Embodiment 2 of the present invention.

Subsequent infusion tubes of the present invention have a structure as shown in FIG. Referring to FIG. 10, the subsequent injection tube has a discharge port 60, one end has an open structure, and the other end has a closed structure. The number and spacing of the holes at each point of the subsequent injection tube are determined in consideration of the injection pressure and the application amount of the polyurea to be applied. For example, the discharge port 60 has four holes for each point, as shown in FIG. 11, and the spacing between the points may be 1 to 3 m.

The subsequent injection pipe is inserted into a space between the pipe line and the outside of the polyurea pipe in a state in which the discharge port 60 is blocked from the outside by a blocking part. For example, the blocking unit may be a tape. The blocking part serves to prevent the polyurea from being introduced into the subsequent injection pipe through the discharge hole 60 at the first injection of the polyurea through the pre injection pipe (step S250). In addition, when the polyurea is injected above the critical pressure through the subsequent injection tube, the blocking part is sequentially discharged from the discharge port of the end portion blocked by the polyurea injection pressure to serve to sequentially eject the polyurea do.

9 is a cross-sectional view for explaining the injection of polyurea through the pre-infusion tube according to a second embodiment of the present invention.

Referring to FIG. 7, the pre-infusion tube and the subsequent injection tube are inserted into a space between the conduit and the polyurea tube, and then the polyurea is firstly introduced into the space through the pre-infusion tube. Inject (step S250). In this case, as shown in FIG. 9, the polyurea is connected between the conduit 62 and the polyurea tube 63 through the pre-injection tube inlet 60 while both sides of the conduit to be repaired are sealed by the sealing device 64. First injection into the space of The polyurea injection pressure is maintained at the same pressure as the polyurea injection pressure through the pneumatic injection device to prevent the polyurea injection from being crushed by the polyurea injection pressure during the pre-injection pipe inlet 60. The injected polyurea pushes out impurities such as water existing in the pipeline through the pre-injection tube outlet 61. When the injected polyurea comes out through the pre-inlet tube outlet 61, the injection of the polyurea is completed, and the pre-inlet tube inlet 60 and the pre-inlet tube outlet 61 are removed and sealed. Thereafter, the pre-injected polyurea is cured.

Referring to FIG. 7, a polyurea is secondly injected through a subsequent injection tube at a time point when the polyurea first injected through a pre-injection tube is hardened, and then a poly portion of the crack is present in the primary injection space and the pipe. The urea is sufficiently filled (step S260). The subsequent injection tube maintains the polyurea injection pressure until the injected polyurea cures, unlike the pre-infusion tube which does not maintain the polyurea injection pressure after polyurea injection. Thus, if the pre-injected polyurea starts filling through the subsequent infusion tube before it is cured, the polyurea injected by the sustained polyurea injection pressure can flow out through the crack of the conduit. For this reason, the starting point of the subsequent injection through the subsequent injection tube should be the point at which the polyurea pre-injected through the pre-infusion tube is cured. During polyurea injection through the subsequent injection tube, the pneumatic injection device maintains the air pressure at the same pressure as the polyurea injection pressure. The reason for maintaining the air pressure at the same pressure as the polyurea injection pressure is as described above when the primary injection of the polyurea through the pre-inlet pipe inlet (step S250). The blocking portion of the subsequent injection tube is discharged from the discharge port when the polyurea injection pressure injected into the subsequent injection tube becomes higher than a threshold pressure and the subsequent injection tube is opened. The polyurea discharged through the discharge port of the subsequent injection tube fills the cracks present in the primary injection space and the pipeline existing in the pipeline.

When the second injection of the polyurea through the subsequent injection tube at the time when the polyurea injected after the first injection of the polyurea through the pre-injection tube is cured, the polyurea secondaryly injected with the polyurea Since the filling pressure of the urea is more tightly filled in the cracks present in the conduit, it may have an additional reinforcing effect of reinforcing the insolvent part present in the conduit.

When the pipe is concrete, cracks are generated as time passes after the pipe is installed, and thus a greater reinforcing effect can be obtained through primary injection of polyurea (step S250) and secondary injection (step S260).

Referring to FIG. 1, when polyurea is secondly injected through the polyurea injection tube to sufficiently fill the cracks existing in the first injected space and the conduit, and the filled polyurea starts to harden. The fixing device is removed to clean up the end of the manhole (step S270). The filled polyurea is cured. At this time, the polyurea injection pressure is maintained until the injected polyurea curing as described above. The subsequent injection tube is not removed unlike the pre injection tube. Therefore, the subsequent injection tube serves as a support reinforcement in addition to the polyurea injection purpose.

According to the non-excavated pipeline repair method using the polyurea of the present invention described above, it is possible to repair the pipeline more economically and environmentally than the conventional non-excavated pipeline repair method. The polyurea resin applied to the pipeline can also be easily adjusted by adjusting the diameter of the polyurea tube designed in consideration of the diameter of each pipeline. Secondary injection process through the subsequent injection pipes provides additional reinforcement effect of the cracks in the pipeline and subsequent injection pipes that are not removed after the secondary injection have reinforcement effect as a support, so they have high reinforcement effect and long life. It can be widely applied not only to water and sewage pipes, but also to metal pipes and water pipes, and industrial pipes such as oil or gas transportation lines.

As described above with reference to the preferred embodiment of the present invention, those skilled in the art without departing from the spirit and scope of the present invention described in the claims below various modifications and It will be appreciated that it can be changed.

1 is a process chart for a non-excavated pipeline repair method according to an embodiment of the present invention.

2 is a perspective view of a structure of a unit tube block according to embodiments of the present invention.

3 is a perspective view of a structure of a unit tube block according to embodiments of the present invention.

4 is a cross-sectional view illustrating a method of connecting a unit pipe block according to embodiments of the present invention.

5 is a cross-sectional view illustrating a method for fixing a polyurea tube according to embodiments of the present invention.

6 is a cross-sectional view for explaining the injection of polyurea through the polyurea injection tube according to the first embodiment of the present invention.

7 is a process chart of the non-excavated water and sewage pipeline repair method according to another embodiment of the present invention.

8 is a cross-sectional view showing a state in which a pre-injection tube and a subsequent injection tube according to Embodiment 2 of the present invention are inserted into a space between a pipe line and a polyurea tube.

9 is a cross-sectional view for explaining the injection of polyurea through the pre-infusion tube according to a second embodiment of the present invention.

10 is a perspective view of the polyurea injection tube structure according to the second embodiment of the present invention.

11 is a perspective view and a cross-sectional view of the polyurea injection tube structure according to the second embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: reinforcing grid 20: passive polyurea

21: polyurea film 22: unit tube block

30: pneumatic injection device 31: polyurea tube

32: pipeline 33: fixing device

34: manhole 35: pneumatic injection hole

40: polyurea injection tube inlet 41: polyurea injection tube outlet

42: pipeline 43: polyurea tube

44: sealing device 50: fixing device

51: pre-injection tube inlet 52: pre-injection tube outlet

53: subsequent inlet tube 54: gap between polyurea tube and conduit

55: pipeline 56: polyurea tube

60: pre-inlet tube inlet 61: pre-inlet tube outlet

62: pipeline 63: polyurea tube

70: discharge port

Claims (8)

delete delete delete Inserting the polyurea tube into the conduit; Inserting a pre-injection tube and a subsequent infusion tube into the space between the conduit and the polyurea tube; Primary polyurea through the pre-infusion tube Injecting; Second injection of polyurea through the subsequent injection tube to fill; And And curing the filled polyurea, wherein the subsequent injection tube has a discharge port and a blocking portion to prevent foreign substances from entering the discharge hole, and the blocking portion has an injection pressure of the polyurea injected into the subsequent injection tube. Unexcavated pipeline repair method opened by The method of claim 4, wherein the injection pressure of the polyurea injected in the first injection and the second injection of the polyurea is the same as the air pressure filled in the polyurea tube. delete 5. The method of claim 4, wherein the polyurea is injected through the subsequent injection tube at the time when the first injected polyurea is touch hardened. 5. The method of claim 4, wherein the conduit is a concrete conduit.

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