KR100381815B1 - Repairing method of retired drain pipes by moving extrusion molding - Google Patents

Abstract

An object of the present invention is to provide a method for repairing and reinforcing sewage pipes using a mobile extrusion molding method that can conveniently repair and reinforce the inner wall of sewage pipes by molding a thermosetting resin having excellent adhesiveness by a mobile extrusion molding method.

According to the present invention for achieving the above object, in the method for repairing and reinforcing the inner wall of the sewage pipe, the two types of thermosetting resin having a low viscosity supplied from the outside of the sewage pipe is directly mixed in a mobile extruder installed inside the sewage pipe. And extrude and heat in a heating apparatus to form a resin tube for repair and reinforcement by tightly curing the inner wall of the sewage pipe, wherein the thermosetting resin is formed of monomers, and in order to improve the strength of the resin tube, fibers are combined with the thermosetting resin. Together with extrusion molding, alumina powder is added to the thermosetting resin in order to improve wear resistance of the resin tube, and a release layer is formed at a portion in contact with each other so that the heating device and the resin tube can be easily separated.

Description

Repairing method of retired drain pipes by moving extrusion molding

The present invention relates to a method for repairing and reinforcing sewage pipes, and more particularly, to a method for repairing and reinforcing sewage pipes by molding a thermosetting resin in a mobile extrusion method as a non-excavation regeneration method.

Most of the sewage pipes constructed in Korea are designed for the depth of burial (depth of the sewer pipe buried), and the load of the sewer pipe (load applied by soil and vehicles at the top of the sewer pipe). As a result, sewage pipes are aged before the design life, and the strength is lowered, and cracks, breakages, and corrosion are generated. As a result, various wastewater flows into the ground, contaminating soil and groundwater and causing ground subsidence. In addition, groundwater or rainwater is introduced into the sewer pipe, causing a lot of problems, such as increasing the cost of sewage treatment.

However, until now, when such problems occur, the entire road where the bad sewer pipes are 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, since this method requires a lot of cost and time, such as damage to intact roads, loss of social overhead costs due to long-term road control, and road repaving costs, it is recently compensated for the irrationality of conventional excavation methods. Shorter and less expensive non-excavation methods are being developed.

The non-excavation repair methods developed so far are largely slip-lining, cured-in-place lining (CIPL), closed-fit lining and spiral wound. pipes lining), and a typical method is to reverse insert a non-woven tube impregnated with a resin such as polyester and a tube making method using a thermoplastic resin.

However, the reverse insertion method always uses a freezer because the tube is frozen to prevent the resin from being cured before construction with the polyester resin impregnated in the nonwoven fabric, and construction must be carried out immediately after impregnating the resin in the tube. Because of this, there are many disadvantages and additional construction costs. In addition, the manufacturing method using a thermoplastic resin has a disadvantage that a large heat source supply device is required to melt the thermoplastic resin, and an additional power unit for transporting a resin having a high viscosity is required. In addition, since the sewage pipe reinforcement method using this pipe manufacturing method uses a thermoplastic resin lacking adhesiveness, an adhesive is injected between the two pipes to closely adhere the resin pipe to the sewer pipe, or the extruded resin pipe is expanded to the existing sewer pipe. There is a disadvantage in that a process of adhering is required.

Republic of Korea Patent No. 217696 describes a technology related to the 'aging pipe repair liner and its coating method'.

The technical contents will be briefly described with reference to FIG. 1 as follows. The invention of the prior art is wrinkled on the inner surface of the liner 1 due to the difference in thermal expansion coefficient between the glass fiber layer 2 and the inner foil 3 due to the high temperature and high pressure steam when the liner 1 is coated on the aged sewer pipe. In addition to preventing the occurrence of the protective layer to prevent damage due to high heat and pressure. That is, the pressure-resistant outer foil (4) and the inner foil (3) is formed on the outside and the inside, and the glass fiber layer (2) impregnated with resin, which is unsaturated resin, between the outer foil (4) and the inner foil (3). Is used, and a liner 1 having an inner foil breakage protection layer 5 detachable from the inner surface of the inner foil 3 is used.

In addition, the method of coating the thus formed liner 1 on the old sewer pipe includes the steps of inserting the liner 1 into the old sewer pipe, expanding the liner 1 to adhere to the inner wall of the old sewer pipe, and expanding the liner. Supplying steam to (1) to cure the unsaturated resin, supplying compressed air to cool the liner (1), and damage to the inner foil (3) and the inner foil inserted inside the liner (1) It consists of the process of removing the protective layer 5.

However, the conventional patent has a disadvantage that the work process is complicated because the cured liner has to be cooled by using a separate cooling device.

Accordingly, the present invention has been made in order to solve the problems of the prior art as described above, by molding a thermosetting resin having excellent adhesiveness by a mobile extrusion molding method that can be easily repaired and reinforcement of the inner wall of the sewer pipe mobile extrusion molding The purpose is to provide a method for repairing and reinforcing sewage pipes using the method.

1 is a schematic view showing the components of the old tube repair liner according to the prior art,

Figure 2 is a schematic diagram for explaining the repair and reinforcement method of the sewage pipe using a mobile extrusion method according to an embodiment of the present invention,

3 is a schematic diagram showing the repair and reinforcement process of the sewage pipe according to the present invention,

4 is a view showing in detail the repair and reinforcement method of the sewage pipe according to the present invention,

5 and 6 are perspective views showing a part of the components of the extruder used in the mobile extrusion method of the present invention,

7 is a cross-sectional view showing a coupling relationship of the extruder shown in FIG.

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

10: resin supply device 11: A stage resin

12: B stage resin 20: extruder

21: inner member 22: outer member

23 Spider 24: Plate

25: screw 26: motor

27: passage 28: heating member

29: resin tube 30: injector

31: release layer 32: cover

33: woven fiber

According to the present invention for achieving the above object, the step of forming a passage through which the resin can be supplied and the movable extruder can move through the self-moving or forced movement method in the sewer pipe, and the mobile extruder while reversing Directly mixing two kinds of thermosetting resins supplied from the outside of the sewer pipe in the sewer pipe and continuously extruding the inner wall of the sewer pipe through a passage of the mobile extruder; and continuously extruding the inner wall of the sewer pipe. Repairing and reinforcing the sewage pipe using a mobile extrusion molding method comprising continuously forming a resin pipe for repair and reinforcement by heating the mixed resin to be heated while the heating apparatus reverses and intimately hardens the inner wall of the sewer pipe. A method is provided.

In addition, according to the present invention, the thermosetting resin is preferably formed of a monomer.

In addition, according to the present invention, in order to improve the strength of the resin tube, it is preferable to extrude the fiber together with the thermosetting resin.

Moreover, according to this invention, it is preferable to add an alumina powder to the said thermosetting resin in order to improve the wear resistance of the said resin tube.

In addition, according to the present invention, in order to make the shape of the front end portion of the resin tube uniform, extruded mixed resin in a state in which one end of the sewer pipe is sealed with a cover, and when the resin is filled in the cover of the extruder It is preferable that the resin pipe be continuously formed by moving.

In addition, according to the present invention, it is preferable that a release layer is formed at a portion in contact with each other so that the heating device and the resin tube can be easily separated.

In the following, with reference to the accompanying drawings, preferred embodiments of a method for repairing and reinforcing sewage pipes using a mobile extrusion method according to the present invention will be described in detail.

In the drawings, Figure 2 is a schematic diagram for explaining the repair and reinforcement method of the sewage pipe using a mobile extrusion molding method according to an embodiment of the present invention, Figure 3 is a schematic diagram showing the repair and reinforcement process of the sewage pipe according to the present invention. to be. And, Figure 4 is a view showing in detail the repair and reinforcement method of the sewage pipe according to the present invention, Figures 5 and 6 is a perspective view showing a part of the components of the extruder used in the mobile extrusion method of the present invention. 7 is a cross-sectional view showing a coupling relationship of the extruder shown in FIG.

The apparatus used in the present invention is an extruder 20 for extruding thermosetting resin to the inner wall of the sewage pipe while moving inside the sewage pipe and a resin supply device 10 for supplying the thermosetting resin to the extruder 20 from the ground. Consists of.

The thermosetting resins used in the present invention are A stage resins 11 (hereinafter referred to as 'A resins') and B stage resins (12; hereafter referred to as 'B resins'), and these resins 11 and 12 are resin supply apparatuses. Supplied at 10. The A resin 11 and the B resin 12 are each composed of a monomer having a viscosity of about 1 Pa · sec, so that the resin is smoothly transferred and does not require large power. Therefore, these resins 11 and 12 are suitable for use in mobile extruders for repairing and reinforcing sewage pipes.

In addition, the extruder 20 used in the present invention is configured to mix the A resin 11 and the B resin 12 supplied from the resin supply device 10 and to extrude and harden the inner wall of the sewage pipe. When the diameter of such an extruder 20 is smaller than the manhole of the sewer pipe, it may be assembled and used integrally inserted into the sewer pipe. However, when the diameter of the extruder 20 is large, the inner surface member 21 and the outer surface member 22 are illustrated in FIGS. ) Using a spider 23 and the outer surface members 22 are assembled in the sewage pipe, respectively, using a cover plate 24. When the inner surface member 21 and the outer surface member 22 are coupled in this way, a radial passage 27 through which the mixed resins 11 and 12 are supplied is formed.

At this time, one side of the passage 27, the screw 25 for mixing the A resin 11 and the B resin 12 supplied through the resin supply device 10, and provides power to such a screw 25 Each motor 26 is provided. That is, the A resin 11 and the B resin 12 are mixed by the screw 25 and supplied to the passage 27.

At one end of the extruder 20, that is, at the end of the inner surface member 21, a heating member 28 for curing while guiding the mixed resin is provided. The heating member 28 has a cylindrical shape and a heater is built therein. When the mixed resin is supplied between the outer surface of the heating member 28 and the inner wall of the sewer pipe, the heating member 28 is heated by the heater and the mixed resin is sewage pipe. It adheres to the inner wall and hardens. Thereby, the resin pipe 29 for repair and reinforcement is formed on the inner wall of the sewage pipe. At this time, the curing speed of the resin is adjusted according to the heating temperature of the heater, and the heating member 28 also serves as a mold until the extruded resin tube 29 is completely cured to maintain its shape.

At this time, in order to easily separate the outer surface of the heating member 28 and the inner surface of the resin tube 29 is provided with a device 30 for injecting a release agent to form a release layer 31, Teflon or the like. It is desirable to form the coating layer with a material having a low friction.

Hereinafter, the repair and reinforcement method of the sewage pipe according to the present invention using the apparatus of the present invention configured as described above will be described in detail.

As shown in FIG. 2, one end of the sewer pipe to be repaired and reinforced is sealed using a cover 32. The sealing with the lid 32 is so that when the extrusion starts at the end of the sewer pipe, the first part of the resin pipe 29 to be extruded can be formed uniformly. That is, when the resin mixed in the extruder 20 is extruded, the lid 32 is fixed to the extruder 20 until the pressure inside the lid 32 reaches a predetermined level, and then the lid 32 When the resin is filled up to increase the pressure, the cover 32 is separated from the extruder 20 as shown in FIG. 3, and the extruder 20 moves backward to extrude the resin pipe 29 to the inner wall of the sewer pipe. Done.

At this time, the extruder 20 moves while extruded the resin pipe 29, using a self-moving method in which the extruder 20 moves backward or from the ground with the resin supply device 10 to the extruder 20. You can add a forced movement method that pulls wires from the ground by connecting them with wires.

And when the resin pipe 29 extruded to the inner wall of the sewage pipe requires high strength, in order to insert the woven fiber 33 woven with fibers or fibers into the resin pipe 29, as shown in FIG. The woven fiber 33 is extruded together with the mixed resin. When the resin tube 29 requires wear resistance, a filler such as alumina powder or the like is added to the A resin 11 or the B resin 12 for extrusion molding.

As described in detail above, the repair and reinforcement method of the sewage pipe using the mobile extrusion method of the present invention can be formed using a thermosetting resin having excellent adhesiveness and forming a repair and reinforcement layer on the inner wall of the sewage pipe without a separate adhesion process. It can significantly shorten.

In addition, the repair and reinforcement method of the sewage pipe of the present invention is not only convenient because it does not need a refrigeration vehicle to prevent the curing of the resin, and does not have to consider the curing time of the resin as in the reverse insertion method, it is possible to reduce the construction cost.

In addition, the use of a resin harmless to the human body in the repair and reinforcement method of the sewage pipe of the present invention can be applied to repair and reinforcement of water pipes.

The technical details of the repair and reinforcement method of the sewage pipe using the mobile extrusion molding method of the present invention have been described above with the accompanying drawings, but the exemplary embodiments of the present invention have been described by way of example and are not intended to limit the present invention.

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

Claims (6)

In the method of repairing and reinforcing the inner wall of the sewage pipe, Disposing a movable extruder in the sewer pipe through which a passage through which a resin can be supplied is formed and which can be moved through a self moving or a forced moving method, Mixing the two types of thermosetting resins supplied from the outside of the sewage pipe while the mobile extruder is backward, directly in the sewage pipe, and continuously extruding the inner wall of the sewage pipe through a passage of the mobile extruder; And moving the mixed resin continuously extruded along the inner wall of the sewage pipe while the heating apparatus reverses and hardens the adhesive resin to the inner wall of the sewage pipe to continuously form a resin pipe for repair and reinforcement. Repair and reinforcement of sewage pipe using molding method. The method of claim 1, wherein the thermosetting resin is formed of monomers. The method for repairing and reinforcing sewage pipes according to claim 1, wherein the fiber is extruded together with the thermosetting resin in order to improve the strength of the resin pipe. The method of claim 1, wherein alumina powder is added to the thermosetting resin in order to improve wear resistance of the resin pipe. The method according to any one of claims 1 to 4, wherein the mixed resin is extruded in a state where one end of the sewage pipe is sealed with a lid so as to make the shape of the tip portion of the resin pipe uniform. When the resin is filled in the extruder is moved to repair and reinforce the sewage pipe using a mobile extrusion molding method characterized in that the continuous molding of the resin pipe. The mobile extrusion method according to any one of claims 1 to 4, wherein a release layer is formed by spraying a releasing agent on a portion in contact with each other so that the heating device and the resin tube can be easily separated. How to repair and reinforce sewage pipes.