KR20030088285A - Repairing Reinforcing Element of Underground Pipes and Trenchless Repairing Reinforcing Method Using the Same - Google Patents

Abstract

PURPOSE: A device for repairing/reinforcing an underground pipe and trenchless repairing/reinforcing method using the same is provided to increase the reinforcement strength of the underground pipe, and to improve work efficiency by simply sealing both ends of tubes. CONSTITUTION: A device(100) for repairing/reinforcing the inner wall of an underground pipe is composed of a soft inner tube(110), a soft outer tube(120), a fiber preform(130) inserted between the tubes, covers(140) inserted into the inner tube and having holes(141,142) through which resin is injected into a gap between the tubes, and clamps(170). A groove(149) is formed along the outer circumference of the cover. The clamps couple the tubes with the groove, and seal both ends of the tubes.

Description

Repair Reinforcing Element of Underground Pipes and Trenchless Repairing Reinforcing Method Using the Same}

The present invention relates to a repair reinforcement mechanism, and more particularly, to a repair reinforcement mechanism for repairing and reinforcing the inner wall of an underground buried pipe in a non-excavation manner. The present invention also relates to a method of repairing and reinforcing underground buried pipes (water-sewage pipes, gas pipes, communication pipes, power supply pipes, etc.) using a thermosetting resin in a non-excavation manner.

About 40-50% of existing underground buried pipes were designed / manufactured without considering the relationship between buried depth (depth of buried pipes) and floor loads (loads applied by soil and vehicles at the top of buried pipes). In addition, due to lack of maintenance, long-term use, and rapid aging of buried pipe materials due to acidification of soil, buried pipes are aged before the design life, resulting in deterioration of strength, cracks, breakage and corrosion.

In the case of sewage pipes, various wastewater flows into the ground as a damaged part, contaminating soil and groundwater and causing ground subsidence. In addition, rainwater flowing into sewage pipes causes many problems, such as increasing the cost of sewage treatment. In addition, in the case of domestic sewage pipes damaged by aging and various causes, it is very difficult to repair and reinforce them because they are buried underground.

Even in the case of the water supply line and the industrial water supply line for supplying drinking water, there are many problems such as inflow of wastewater or groundwater due to aging and damage due to long use, and thus, it is necessary to replace or repair the pipeline. In the case of underground gas pipes, there is a risk of gas leaking to the damaged part, which can directly lead to a great loss of life and property. In the case of communication tubes, groundwater, etc., penetrates into the damaged part, causing expensive communication cables to be damaged, causing communication loss, etc., resulting in loss of social overhead capital.

However, until now, when such a problem occurs, the entire burial road where the bad buried pipe is buried is extensively controlled for a long time, and heavy machinery and manpower are used to excavate the road to replace the old pipe. However, this method not only causes a lot of problems such as intact road damage, loss of social indirect capital due to prolonged road control, traffic congestion caused by road occupation and traffic accident, but also a considerable amount of construction rubble and noise. It generates harmful environmental elements such as vibration and dust. In addition, resurfacing the excavated road would waste a lot of money and time, and damage other underground facilities buried nearby (water and sewage pipes, gas pipes, telecommunications, and other accessories other than the buried pipe). It is likely to be coated. Therefore, in recent years, the non-excavation method has been developed to compensate for the unreasonable point of the conventional excavation method, the construction period is shortened and the cost is low.

The non-excavation repair methods developed to date have largely included slip lining, cured-in-place lining (CIPL), closed-fit lining, and spiral wound pipes. lining), and the like, and a method of inverting and inserting a non-woven tube impregnated with a resin such as polyester and a manufacturing method using a thermoplastic resin.

However, the reversal insertion method is inconvenient because the freezing car must be used at all times because the tube is cryopreserved in order to prevent the polyester resin impregnated in the nonwoven fabric from being cured before construction. There are many points and the disadvantage of additional construction cost. In addition, the reverse insertion method has a disadvantage in that the non-woven tube is wetted with the waste water or groundwater in the buried pipe during the process, the quality is degraded, and the adhesion with the existing buried pipe is inferior. In addition, the manufacturing method using a thermoplastic resin requires a large heat source supply device to melt the thermoplastic resin, an additional power unit for transporting a resin having a high viscosity, and a method of melting the thermoplastic resin and molding the same in a buried pipe. It has a long time and low reinforcement strength.

Korean Patent Application No. 2000-15776 describes a technique related to "repair and reinforcement of sewage pipes using a resin transfer molding method" filed by the present applicant. In the case of this technology, the woven fiber or nonwoven fabric serving as a reinforcing material is impregnated with groundwater or wastewater remaining in the sewer pipe, which hinders the impregnation of the resin in the woven fiber or nonwoven fabric, and thus the quality thereof is deteriorated. There are disadvantages.

Therefore, the present invention has been made in order to solve the problems of the prior art as described above, and to form a coating film through the tubes located on the inside and outside of the fiber preform and to prevent contamination by groundwater or wastewater buried pipe The purpose of the present invention is to provide a reinforcing reinforcement mechanism for underground buried pipe and a non-excavation reinforcing reinforcement method using the same to improve reinforcement strength of the tube and improve workability by using a cover that can conveniently seal both ends of the tubes.

1 is an exploded perspective view showing the components of the maintenance reinforcement mechanism of the underground buried pipe according to an embodiment of the present invention,

2 is a cross-sectional view of the components of the maintenance reinforcement mechanism shown in FIG.

3 to 5 are schematic views showing various forms of a cover constituting the reinforcement mechanism shown in FIG. 1, respectively.

6 is a cross-sectional view showing another component of the repair reinforcement mechanism of the underground buried pipe according to the present invention;

7 is a schematic diagram showing a process of installing a string in an underground buried pipe,

8 is a schematic diagram showing a process of injecting a reinforcing material which is a part of the reinforcing mechanism according to the present invention in a buried pipe,

Figure 9 is a schematic diagram showing a process of supplying a hot fluid in the inner tube of the reinforcing mechanism according to the present invention,

10 and 11 are schematic views illustrating a method of supporting the lid shown in FIG. 1, respectively.

12 is a schematic diagram showing a process of impregnating a thermosetting resin into a fiber preform of a reinforcing mechanism according to the present invention.

♠ Explanation of symbols on the main parts of the drawing ♠

100: reinforcement mechanism 110: inner tube

120: outer tube 130: fiber preform

140: cover 150: porous vent pipe

160: adhesive 170: clamp

180: thermosetting adhesive

The maintenance reinforcing mechanism of the underground buried pipe of the present invention for achieving the above object, the inner tube and the outer tube of a flexible material, the fiber preform inserted between the tubes and the size that can be inserted into the inner tube Communication holes for supplying a fluid into the inner tube and injecting resin between the tubes are formed, and a cover is formed along the outer circumferential surface, and the tubes are coupled to each other in the groove of the cover. And a sealing device for respectively sealing both ends of the tubes.

In addition, the repair and reinforcement method of the underground buried pipe of the present invention, the first step of placing a reinforcement consisting of a fiber preform inserted between the inner and outer tubes of the flexible material and the inner and outer tubes in the underground buried pipe, and the inner tube And a second step of inserting a cover in which communication holes are formed in communication with each other between the tubes and having a groove formed along an outer circumferential surface of the inner tube, and coupling the tubes to each other in the groove of the cover. A third step of sealing both ends of the field; and supplying fluid into the inner tube through the communication hole to remove wrinkles and torsion of the reinforcing material generated in the first step, and to harden the binder of the fiber preform after melting. A fourth step for the reinforcement to have a tubular shape, and resin is injected between the tubes through the communication hole. And re-supplying the fluid in the inner tube to impregnate the resin in the fiber preform, and to discharge the internal air to the outside to cure and remove the cover.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the repair reinforcement mechanism of the underground buried pipe according to the present invention and a non-excavation repair reinforcement method using the same.

First, the repair reinforcement mechanism of the underground buried pipe according to the present invention will be described in detail.

1 is an exploded perspective view showing the components of the repair reinforcement mechanism of the underground buried pipe according to an embodiment of the present invention, Figure 2 is a cross-sectional view of the components of the repair reinforcement mechanism shown in FIG. As shown in Figures 1 and 2, the reinforcing mechanism 100 of the present invention is a non-permeable inner tube 110 and outer tube 120 of a flexible material such as PVC tube and the tubes (110, 120) Fiber preforms (130) inserted between the and the inner tube communication hole 141 and the outside having a size that can be inserted into the inner tube 110 and communicate with the inner tube 110 and outer tube 120 A cover 140 having tube communication holes 142 formed therein, and a clamp 170 that couples the cover 140 and the tubes 110 and 120 to each other to seal both ends of the tubes 110 and 120, respectively. It is composed.

The inner tube 110, the outer tube 120 and the fiber preform 130 as described above is combined to form a reinforcing material. This reinforcement is produced in large quantities and wound on rolls, which are cut into lengths necessary for the reinforcement of underground buried pipes and used.

The inner tube communication hole 141 of the cover 140 includes a fluid injection tube 141a for injecting fluid into the inner tube 110 and an installation tube for installing a pressure gauge for measuring the pressure in the inner tube 110 ( 141b) are respectively installed as needed. The outer tube communication hole 142 is provided with a resin injection tube 142a for injecting resin into the reinforcing material and an air discharge tube 142b for discharging air in the reinforcing material due to the injected resin.

The cover 140 configured as described above may be integrated into the buried pipe 200 when the diameter of the buried pipe 200 to be repaired is smaller than the diameter of the manhole, but may be carried into the buried pipe 200 when the buried pipe is large. Can be assembled inside. In this case, when the cover 140 is integrally formed, a predetermined width and depth along the outer circumferential surface may be provided so that the clamp 170 or the sealing device may be placed in close contact with the outer circumferential surface of the cover 140 to seal. It is preferable to form the groove 149 having a. In the case where the cover 140 is integrally formed, a transparent acrylic disc may be coupled to one surface of the steel ring having a groove formed on the outer circumferential surface thereof.

In addition, when the cover 140 is formed in a divided form, it is preferable to form the groove 149 on the outer circumferential surface in the same manner as the integral form. Such a split type cover can be used in three types as shown in Figs. 3 to 5 are schematic views showing various forms of a cover constituting the reinforcement mechanism shown in FIG.

First, as shown in FIG. 3, the cover 140 is divided into two parts, and the cover 140 is fastened by fitting a groove 143 having a dove tail shape to one side. At this time, the O-ring (144; O-ring) is inserted into the mating surface to prevent the air from counting. If the cover 140 is considerably larger than the size of the manhole, it is divided into three or four parts.

Second, as shown in FIG. 4, one side of the cover 140 divided into two parts processes the male screw 145 and the other side processes the female screw to screw the two parts together to form a cover. At this time, the coupling surface is coated with rubber 146 to prevent the air from counting, and put a ball snap (147: Ball Snap) to be fastened accurately. Even in this case, if the cover 140 is considerably larger than the size of the manhole, it is divided into three or four parts.

Third, it is preferable to make and engage the coupling portion 148 as shown in FIG. 5 on the coupling surface of the part divided into two or four parts. At this time, the O-ring 144 is used on the engaging surface to prevent the air from counting.

6 is a cross-sectional view showing another component of the repair reinforcement mechanism of the underground buried pipe according to the present invention.

As shown in Figure 6, the reinforcement mechanism 100 of the present invention is connected to the outer tube through hole 142 of the cover 140 is a porous vent pipe 150 is inserted into the air discharge pipe 142b for discharging air It is configured to include. The porous vent pipe 150 is located between the outer tube 120 and the fiber preform 130 along the longitudinal direction of the reinforcement. That is, the porous vent pipe 150 is inserted to more surely remove bubbles in the fiber preform 130, and is a thin tube made of a flexible material having a diameter smaller than that of the air discharge pipe 142b. Forming, the bubbles move through these holes, thereby removing the bubbles.

As shown in Figure 2 and 6, the outer tube 120 of the reinforcing mechanism 100 of the present invention not only prevents the fiber preform 130 is scratched and damaged by the inner wall of the buried pipe, It acts as a protective film to prevent the fiber preform from getting wet such as remaining groundwater or wastewater, which does not adversely affect the resin impregnation. In addition, the outer tube 120 of the reinforcing mechanism 100 of the present invention is preferably coated with an adhesive 160 that acts as a lubricant by increasing the bonding force with the inner wall of the buried pipe and reducing the friction when inserted into the buried pipe. Do.

Next, a method of repairing and reinforcing the underground buried pipe according to the present invention will be described in detail.

The apparatus used in the present invention includes a compressor or pump 210 equipped with a heater for injecting hot fluid (air or liquid) into the inner tube 110, a resin supply device 220 for supplying resin, and a resin. A vacuum pump 310 that helps smooth impregnation and improves the bubble removal efficiency inside the fiber preform, and a resin storage container 320 which prevents the discharge resin mixed with bubbles from directly entering the vacuum pump 310 and separates the resin from the bubbles. Consists of The method of repairing and reinforcing the inner wall of the underground buried pipe using the apparatus of the present invention configured as described above is performed through the following four processes.

<1st process>

Figure 7 is a schematic diagram showing a process of installing a string in the underground buried pipe, Figure 8 is a schematic diagram showing a process of injecting a reinforcing material which is part of the reinforcing mechanism in the buried pipe.

First, using the robot 230 that can move along the underground buried pipe 200 to clean the interior of the underground buried pipe 200 that needs repair reinforcement, and removes obstacles and protrusions. Thereafter, the rope 240 is hung on the robot 230 and the robot 230 is pushed into the manhole 250 on one side to move along the underground buried pipe 200, as shown in FIG. The string 240 is positioned in the underground buried pipe 200 between the manhole and the manhole by collecting the robot 230 through the manhole 260.

Then, as shown in Figure 8, one side of the string 240 is connected to the reinforcement (composed of the inner tube 110, outer tube 120 and fiber preform 130) that is part of the reinforcement mechanism 100. Then, the reinforcement is placed in the underground buried pipe 200 by pulling the winding machine 270 from the opposite side.

<Second process>

When the reinforcing material is located in the underground buried pipe 200 through the first process, each end of the reinforcing material is sealed by using the cover 140 shown in FIGS. Keep it confidential.

That is, the cover 140 is inserted into the inner tube 110 of the reinforcement as shown in FIG. At this time, the thermosetting adhesive 180 is applied to maintain the airtightness between the groove 149 formed on the outer circumferential surface of the cover 140 and the corresponding inner tube 110 and outer tube 120, respectively. In addition, a rubber sealant may be used between the groove 149 of the cover 140 and the inner tube 110 instead of the thermosetting adhesive 180.

After the thermosetting adhesive or rubber sealant is applied as described above, the cover 140 and the reinforcement are firmly tightened by using a clamp 170 or a fixing device capable of a similar function. Therefore, the airtight due to the adhesive or the rubber sealant is maintained between the cover 140 and the inner tube 110 and the inner and outer tubes 110 and 120. At this time, the groove 149 of the cover 140 allows the clamp 170 or the fixing device to be strongly engaged to help maintain the airtightness.

In this state, the pressure gauge 280 is installed in the pressure gauge mounting tube 141b in the lid 140 which seals both ends of the reinforcing material.

Then, as shown in FIG. 9, after connecting the compressor or the pump 210 equipped with the heater to the fluid injection pipe 141a of the cover 140 located on the other side where the pressure gauge 280 is not installed, the hot Inflate by injecting fluid (air or liquid). 9 is a schematic diagram showing a process of supplying hot fluid into the inner tube of the reinforcement mechanism according to the present invention. Thus, wrinkles and torsion of the reinforcement are removed by the injection of hot fluid, and the binder in the fiber preform 130 is melted and cured while cooling to maintain the external appearance of the tube. The outer tube 120 of the reinforcement mechanism 100 is underground. It is in close contact with the inner wall of the buried pipe (200). That is, the outer tube 120 that surrounds the fiber preform 130 is expanded by the injected heat and is in close contact with the inner wall of the underground buried pipe 200, and the outer tube is formed by the adhesive 160 applied to the outer tube 120. 120 is fixed to the inner wall of the underground buried pipe (200). Thereafter, the hydraulic pressure applied to the inner tube 110 is removed. This makes it possible to easily inject thermosetting resin into the fiber preform later.

When injecting the fluid as described above, the inner tube 110 takes a high pressure of about 1.0MPa, it must be designed to withstand the pressure. That is, before injecting the fluid into the inner tube 110, as shown in Figure 10 using the wedge 190 to support the cover 140, or as shown in Figure 11 between the cover 140 and the inner tube 110 After passing the iron core 191 across the cover by fastening the nut 192 at both ends can be configured to withstand the pressure 140. However, if the inner and outer tubes 110, 120 are strong enough to withstand the pressure applied, it is not necessary to use a separate support device. 10 and 11 are schematic views illustrating a method of supporting the lid shown in FIG. 1, respectively.

<Third process>

12 is a schematic diagram showing a process of impregnating a thermosetting resin into a fiber preform of a reinforcing mechanism according to the present invention. As shown in FIG. 12, one side of the supply pipe 290 is connected to the resin injection pipe 142a formed on the cover 140. The other side of the supply pipe 290 is connected to the resin supply device 220 to supply the thermosetting resin 300. At this time, since the resin to be used is composed of monomers and has a low viscosity, it is easy to transfer the resin so that a large amount of power is not consumed in the resin injection. As such, the present invention is characterized in that smooth resin flow is possible by injecting the resin without pressure, thereby shortening the injection time of the resin and improving productivity.

<4th process>

After injecting the amount of resin calculated in the third step, the resin injection is stopped and the resin supply pipe 290 is separated from the cover 140. Then, after connecting the compressor or the pump 210 is equipped with a heater to the fluid inlet tube (141a) of the cover 140 as described above and inflated again by injecting a hot fluid (air or liquid). Then, the resin injected while the outer tube 120 is in close contact with the inner wall of the buried pipe 200 is impregnated in the fiber preform 130 to be filled between the inner tube 110 and the outer tube 120 and present therebetween. The air is discharged to the outside through the air discharge pipe (142b).

At this time, by connecting the vacuum pump 310 to the air discharge pipe (142b) to apply a vacuum to help the smooth impregnation of the resin, increase the bubble removal efficiency inside the fiber preform can increase the fiber volume fraction of the buried pipe reinforced by repair. . In this case, when the vacuum pump 310 is used, the resin storage container 320 is connected between the air discharge pipe 142b and the vacuum pump 310 so that the discharge resin mixed with bubbles flows directly into the vacuum pump 310. To separate the resin and air bubbles. When the curing is completed after the resin is injected through this process, by removing the cover 140, the inner wall of the underground buried pipe 200 is repaired and reinforced.

The outer tube 120 of the reinforcement mechanism 100 repaired and strengthened through the above process serves as a protective film to prevent the fiber preform 130 from wetting the waste water and the groundwater remaining in the buried pipe so as not to adversely affect the resin impregnation. , The inner tube 110 serves as a coating film.

In the present invention, in repairing and reinforcing the underground buried pipe 200, when the porous pipe 150 is installed between the fiber preform 130 and the outer tube 120, the inner tube (through the porous pipe 150) Bubbles between the 110 and the outer tube 120 can be removed more reliably. At this time, when the buried pipe to be repaired is a gravity pipe, since the strength of the reinforcement pipe is not largely necessary, the porous pipe 150 may be left. However, when the buried pipe is a pressure pipe, because the strength of the reinforcing pipe is important, it is removed after the resin injection process because it acts as a defect when the porous pipe 150 is subjected to a load. At this time, since the part of the porous vent pipe 150 protrudes out of the air discharge pipe 142b, the part of the porous vent pipe 150 may be pulled out.

As described in detail above, the repair reinforcement mechanism of the underground buried pipe according to the present invention improves the reinforcement strength of the buried pipe by forming a coating film through tubes positioned inside and outside the fiber preform, and preventing contamination by groundwater or wastewater. It is effective to let.

In addition, the repair and reinforcement method of the underground buried pipe of the present invention can be conveniently sealed and separated from both ends of the tube through the cover has the effect of improving workability.

Although the technical details of the repair reinforcement mechanism of the underground buried pipe of the present invention and the non-excavation repair reinforcement method using the same have been described together with the accompanying drawings, this is illustrative of the best embodiments of the present invention, which is intended to limit the present invention. It is not.

In addition, it is obvious that any person skilled in the art can make various modifications and imitations within the scope of the appended claims without departing from the scope of the technical idea of the present invention.

Claims (16)

In the mechanism for repairing and reinforcing the inner wall of the underground buried pipe in a non-excavation method, An inner tube and an outer tube of a flexible material; A fiber preform inserted between the tubes; A cover having a size that can be inserted into the inner tube, and a communication hole for supplying a fluid into the inner tube and injecting resin between the tubes, each having a groove formed along an outer circumferential surface thereof; And a sealing device for coupling the tubes to each other in the groove of the cover to seal both ends of the tubes, respectively. The maintenance reinforcement mechanism of the underground buried pipe according to claim 1, wherein a thermosetting adhesive is applied to the grooves of the cover and the tubes corresponding to the grooves. The repair reinforcement of the underground buried pipe according to claim 1, wherein a rubber sealant is positioned between the groove of the cover and the inner tube, and a thermosetting adhesive is applied between the tubes at positions corresponding to the groove. Instrument. According to claim 1, Between the fiber preform and the outer tube is disposed in the longitudinal direction is provided with a flexible pipe formed of a flexible material formed with a plurality of holes at equal intervals along the longitudinal direction to discharge the air existing therein to the outside Repair reinforcement mechanism of underground buried pipe characterized in that it becomes. The repair reinforcement mechanism of an underground buried pipe according to claim 1, wherein an adhesive is applied to a surface of the outer tube. The repair reinforcement mechanism of the underground buried pipe according to claim 1, further comprising a wedge for supporting the cover from the outside. The repair reinforcement mechanism of an underground buried pipe according to claim 1, further comprising an iron core penetrating the cover and the inner tube, and a nut for fastening both ends of the iron core to an outer surface of the cover. The maintenance reinforcement mechanism of an underground buried pipe according to any one of claims 1 to 7, wherein the cover is composed of two or more divided types. The basement according to any one of claims 1 to 7, wherein the cover is formed by combining transparent acrylic discs each having the communication holes formed on one side of a steel ring having a groove formed along an outer circumferential surface thereof. Reinforcement mechanism of buried pipe. A first step of placing a reinforcement composed of a fiber preform inserted between the inner and outer tubes of the flexible material and the inner and outer tubes in the underground buried pipe, A second step of inserting a cover formed with communication holes communicating with each other between the inner tube and the tubes and having a groove formed along an outer circumferential surface of the inner tube, Coupling the tubes to each other in the groove of the cover to seal both ends of the tubes, respectively; Supplying a fluid into the inner tube through the communication hole to remove wrinkles and torsion of the reinforcing material generated in the first step, and to allow the binder of the fiber preform to melt and harden so that the reinforcing material has a tubular shape. 4 steps, After the resin is injected between the tubes through the communication hole and the fluid is re-supplied in the inner tube to impregnate the resin in the fiber preform, the internal air is discharged to the outside to cure and remove the cover Non-excavation repair reinforcement method using the repair reinforcement mechanism of the underground buried pipe, characterized in that it comprises five steps. The non-excavation repair reinforcement using the repair reinforcement mechanism of the underground buried pipe according to claim 10, wherein before the step 3, a thermosetting adhesive is applied to the grooves of the cover and the tubes at positions corresponding to the grooves. Way. The basement according to claim 10, wherein before the step 3, a rubber sealant is placed between the groove of the cover and the inner tube, and a thermosetting adhesive is applied between the tubes at positions corresponding to the groove. Non-excavation repair reinforcement method using the repair reinforcement mechanism of buried pipe. The method of claim 10, wherein before the four steps, the exterior of the cover by using a wedge to support the non-excavation repair reinforcement method using a repair reinforcement mechanism of the underground buried pipe. The reinforcement mechanism of the underground buried pipe according to claim 10, wherein before the step 4, an iron core penetrating the cover and the inner tube is installed, and both ends of the iron core are fastened with nuts at the outer surface of the cover, respectively. Non-excavation repair reinforcement method using 15. The basement according to any one of claims 10 to 14, wherein when the fluid is resupplied in the inner tube in step 5, a vacuum pump is connected to a communication hole communicating with the tubes to apply a vacuum. Non-excavation repair reinforcement method using the repair reinforcement mechanism of buried pipe. 16. The non-excavation repair reinforcement method according to claim 15, wherein a vacuum is applied while the resin storage container is connected between the communication hole and the vacuum pump.