Repair method for old horizontal pipe

Abstract

The present invention relates to a repair method for aging horizontal pipes that prevents the risk of safety accidents associated with replacement by repairing the interior of the aging horizontal pipe made of cast iron material by coating it without replacing it, while simultaneously reducing repair costs relative to the cost of replacement and maximizing the service life of the horizontal pipe. To this end, the present invention comprises: a repair work preparation step (A) in which a process of cutting off sewage or wastewater, primary cutting, cleaning, and inspection of the downstream main horizontal pipe, secondary cutting of the upstream connecting part of the main pipe or each branch pipe, and heating by wrapping a rubber heater around the outer surface of the main horizontal pipe; a primer primary coating treatment step (B) in which a sealing cap is attached to each cut part, primer is sprayed and applied to the inside of the main horizontal pipe using an applicator through the sealing cap, a rubber tube is inserted after removing the sealing cap, steam pressure is applied inside using a steam injector to evenly distribute and cure the primer, and the primer distribution and curing state are inspected through a secondary photograph after removing the rubber tube; and an epoxy resin secondary coating treatment step (C) in which epoxy resin is applied to the surface of the primer by attaching a secondary sealing cap, steam pressure is applied using a steam injector after removing the sealing cap to induce even distribution of the epoxy resin, and the epoxy resin application and curing state are inspected through a tertiary photograph after removing the rubber tube. It is characterized by being repaired through a finishing process step (D) of removing the rubber heater and finally connecting and assembling each cut part with a connector.

Description

Technology Field

[0001] The present invention relates to a repair method for aging horizontal pipes that prevents the risk of safety accidents associated with replacement by repairing the interior of the aging horizontal pipe made of cast iron material without replacing it, while simultaneously reducing repair costs relatively compared to the cost of replacement and maximizing the service life of the horizontal pipe. Background Technology

[0002] In the interiors of various buildings, sewer pipes and wastewater pipes for discharging domestic sewage or wastewater are installed in a vertical structure, and at their lower ends, horizontal pipes are installed so as to be exposed within the basement ceiling to collect sewage or wastewater and discharge it into a final sump. Furthermore, cast iron pipes are primarily used for these horizontal pipes. Consequently, due to the characteristics of the material, it is common for conventional cast iron horizontal pipes to corrode or deteriorate after approximately 10 years or more, requiring replacement work.

[0003] However, the aforementioned horizontal pipes are made of cast iron, making them heavy, and their installation height is 4 to 5 meters or more, which presents a problem in that replacing them is not an easy task. In other words, the replacement of these horizontal pipes is currently carried out mainly by manual labor by workers. During this replacement process, workers are constantly exposed to the risk of safety accidents due to poor working conditions, such as the weight of the pipes and their installation height. The fact that such safety accidents inevitably occur occasionally is a major problem with the replacement work and is a task that must be urgently improved. Furthermore, there is the issue of high costs associated with the replacement of horizontal pipes. In particular, this excessive cost leads to the neglect or postponement of replacement work, which in turn results in various safety issues caused by the aging of the horizontal pipes.

[0004] Considering these points, in the past, the lifespan of the horizontal pipe was extended by managing the pipe through a method of periodically cleaning the inside of the pipe to minimize the aging of the horizontal pipe. Taking this into account, Patent Document 1 provides a ‘horizontal pipe cleaning facility and method’ for cleaning sludge and other substances remaining inside the horizontal pipe. Prior art literature

[0005] 1. KR101029716 B1 (Notice dated April 18, 2011) The problem to be solved

[0006] Accordingly, the present invention was made to solve the aforementioned problems of the conventional methods. The objective of the present invention is to provide a repair method for aging horizontal pipes that prevents the risk of safety accidents associated with replacement by repairing the interior of the aging horizontal pipe made of cast iron material by coating it without replacing it, while simultaneously reducing repair costs relatively compared to the cost of replacement and maximizing the service life of the horizontal pipe. means of solving the problem

[0007] According to the repair method for aging main horizontal pipes of the present invention for achieving the above-mentioned purpose, the method comprises: (a) a step of blocking the inflow of sewage or wastewater into the main horizontal pipe or a branch pipe branched from the main horizontal pipe (S110); (b) a step of first cutting the downstream section of the main horizontal pipe where repair work is required within a range where repair work is possible, while the inflow of sewage or wastewater is blocked through step (a) (S120); (c) a step of thoroughly cleaning the inside of the main horizontal pipe using high pressure through the first cut section downstream of the main horizontal pipe that was cut and opened through step (b) (S130); and (d) a step of first inspecting the inside of the main horizontal pipe through endoscopic imaging (CCTV) to verify the internal cleaning status of the main horizontal pipe after high-pressure cleaning is completed through step (c) (S140). (e) After completing step (d), a step of secondarily cutting the upstream portion of the main horizontal pipe requiring repair work or the connection portion of each branch pipe branched from the main horizontal pipe (S150); (f) After completing step (e), a step of wrapping a rubber heater around the outer surface of the main horizontal pipe requiring repair work and then heating it to an appropriate temperature (S160); (g) After completing step (f), a step of first sealing caps on the open upstream and downstream cut portions of the main horizontal pipe or the open connection cut portions of each branch pipe and joining them (S170); (h) After completing step (g), a step of attaching an applicator to the sealing caps covering each cut portion of the main horizontal pipe or branch pipe and firstly spraying and applying a primer evenly into the interior (S180); (i) After completing step (h), a step of removing the sealing caps blocking the cut portions of the main horizontal pipe or each branch pipe (S190); (j) After the completion of step (i) above, a release agent is applied to the outer surface through the downstream cut portion of the horizontal pipe, and a rubber tube in the shape of a rubber balloon with one end blocked is inserted first (S200);(k) After step (j) above, a step of providing appropriate steam pressure using a steam injector through the open part of the rubber tube and simultaneously pressurizing and heating the rubber tube so that the primer is evenly distributed and cured with a uniform thickness (S210); (l) After completing step (k) above, a step of removing the steam pressure on the rubber tube and simultaneously separating and removing the rubber tube from the inside of the horizontal main pipe in the first step (S220); (m) After step (l) above, a step of inspecting by taking a second endoscopic photograph (CCTV) to check the state of the primer applied and cured inside the horizontal main pipe (S230); (n) After step (m) above, a step of attaching a sealing cap again to the cut part of the horizontal main pipe or each branch pipe in the second step for the next operation (S240); (o) A step of applying epoxy resin a second time by attaching an applicator to each sealing cap placed through step (n) on the primer surface, where the primer application and curing are completed through step (m) above (S250); (p) A step of removing the sealing cap blocking the cut portion of the main horizontal pipe or each branch pipe a second time after the completion of step (o) above (S260); (q) A step of reapplying a release agent to the outer surface through the downstream cut portion of the main horizontal pipe and inserting a rubber tube in the shape of a rubber balloon with one end closed a second time after the completion of step (p) above (S270); (r) A step of providing appropriate steam pressure using a steam injector through the open portion of the rubber tube and simultaneously pressurizing and heating the rubber tube so that the epoxy resin applied to the primer surface is evenly distributed and cured with a uniform thickness after step (q) above (S280); (s) After the completion of step (r) above, a step of removing steam pressure on the rubber tube and simultaneously separating and removing the rubber tube from the inside of the horizontal main pipe in a second step (S290); (t) After the completion of step (s) above, a step of inspecting by taking a third endoscopic image (CCTV) to check the coating state of the epoxy resin applied and cured on the inner primer surface of the horizontal main pipe (S300);(u) A step (S310) of removing the rubber heater wrapped around the outer surface of the main horizontal pipe after the completion of step (t) above; (v) A step (S320) of finally connecting and fixing the downstream and upstream cut sections of the main horizontal pipe and the cut sections of each branch pipe using a connector after step (u) above; characterized by being repaired through this process.;

[0008] According to the present invention, in step (f), the rubber heater is heated within a range of about 150 to 200°C.

[0009] According to the present invention, the steam pressure provided inside the rubber tube in step (k) or step (r) is characterized by being maintained within a range of 70 to 90°C for about 30 to 60 minutes. Effects of the invention

[0010] According to the present invention, by repairing the aging horizontal pipe made of cast iron by coating the interior without replacing it, the risk of safety accidents associated with replacement is prevented, and the repair cost can be reduced relatively compared to the cost of replacement, while the service life of the horizontal pipe can be extended to the maximum.

[0011] Furthermore, the effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims. Brief explanation of the drawing

[0012] Figure 1 (a) and (b) are excerpt drawings illustrating that the diameters of the horizontal pipes may differ. Figure 2 is a step-by-step process diagram according to the repair method according to the present invention. Figure 3 is a detailed process diagram according to the repair preparation step of the present invention. Figure 4 is a detailed process diagram according to the primer first coating treatment step of the present invention. Figure 5 is a detailed process diagram according to the epoxy resin secondary coating treatment step of the present invention. Figure 6 is a detailed process diagram according to the finishing treatment step of the present invention. FIG. 7 is a cross-sectional view of the outer surface of the horizontal main tube of the present invention with a rubber heater wrapped around it. FIG. 8 is a cross-sectional view illustrating an example of a state in which a rubber tube is inserted and expanded inside the primer after application according to the present invention. FIG. 9 is a cross-sectional view illustrating an example of a state in which a rubber tube is inserted and expanded inside the epoxy resin after coating according to the present invention. FIG. 10 is an excerpted cross-sectional view of a horizontal pipe with the coating repair treatment completed according to the present invention. Specific details for implementing the invention

[0013] The objects, specific advantages, and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings. It should be noted that in assigning reference numerals to the components of each drawing in this specification, identical components are assigned the same number whenever possible, even if they are shown in different drawings. Furthermore, in describing the present invention, if it is determined that a detailed description of related prior art could unnecessarily obscure the essence of the invention, such detailed description may be omitted.

[0014] Hereinafter, preferred embodiments according to the present invention will be described in more detail with reference to the accompanying drawings.

[0015] According to the present invention, an aging main horizontal pipe can be repaired safely and conveniently without the risk of safety accidents by the following methods. As is well known, a main horizontal pipe is installed horizontally so as to be suspended from the basement ceiling of a building to discharge various types of domestic sewage or wastewater. Furthermore, the main horizontal pipe (10) may have the same diameter as exemplified in FIG. 1 (a), or may be installed in various ways as needed to have different diameters as exemplified in FIG. 1 (b). In addition, branch pipes (12) may be branched and connected to the main horizontal pipe (10). Moreover, conventional main horizontal pipes are mainly manufactured and installed using cast iron, and the purpose of the present invention is to provide a repair method that allows the service life of an aging main horizontal pipe made of cast iron to be extended to the maximum extent without replacement.

[0016] The repair method for aging horizontal pipes according to the present invention can be broadly divided into a repair work preparation step (A); a primer first coating treatment step (B); an epoxy resin second coating treatment step (C); and a finishing step (D), as exemplified in FIG. 2, and each of these steps can be described more specifically as described below.

[0017] That is, the repair work preparation step (A) can proceed with processes (a) to (g) as exemplified in FIG. 3, the primer first coating treatment step (B) can proceed with processes (h) to (m) as exemplified in FIG. 4, the epoxy resin second coating treatment step (C) can proceed with processes (n) to (t) as exemplified in FIG. 5, and the finishing treatment step (D) can proceed with processes (u) to (v) as exemplified in FIG. 6.

[0018] The work process for each step is described in detail below, and through this description, the maintenance process for each step can be sufficiently explained and understood sequentially.

[0019] (a) Step of blocking the inflow of sewage or wastewater (S110)

[0020] The above step (a) is a step of blocking the inflow of sewage or wastewater into the main horizontal pipe (10) or the branch pipe (12) branched from the main horizontal pipe, and generally, a method of shutting off the water supply during the time maintenance work is being carried out may be used. The water shut-off may take about 2 to 3 hours, although it may vary depending on the work environment or the extent.

[0021] (b) Step of primary cutting of the downstream section of the horizontal pipe (S120)

[0022] (b) is a step of first cutting the downstream section of the horizontal pipe (10) where repair work is required, within a range where repair work is possible, while the inflow of sewage or wastewater into the horizontal pipe is blocked in step (a) above.

[0023] (c) Internal high-pressure cleaning step of the horizontal pipe (S130)

[0024] Step (c) is a step of cleaning the inside of the main horizontal pipe (10) at high pressure using a high-pressure washer, utilizing the downstream primary cut portion of the main horizontal pipe (10) that was cut and opened in Step (b). This is a measure to remove various debris remaining inside the main horizontal pipe so that subsequent coating repair work can be easily performed. During the high-pressure cleaning operation, a vacuum vehicle for sucking up and removing various debris, including a spray nozzle connected to a spray hose that can be withdrawn from a spray vehicle, may be appropriately utilized.

[0025] (d) First imaging inspection step of internal cleaning status of the horizontal pipe (S140)

[0026] Step (d) is a step of inspecting the internal cleaning status of the horizontal pipe (10) through an endoscope (CCTV) in order to check the internal cleaning status after high-pressure cleaning in Step (c). Through this inspection, it is possible to accurately check the internal cleaning status of the horizontal pipe, and appropriate additional necessary measures, such as cleaning again, can be taken based on the results.

[0027] (e) Secondary cutting step (S150) of each branch pipe upstream of the main horizontal pipe or connected to the main horizontal pipe

[0028] Step (e) is a step of secondarily cutting the upstream part of the main horizontal pipe (10) where repair work is required, or the connection part of each branch pipe (12) branched from the main horizontal pipe, or the necessary appropriate work area, after the inspection of Step (d) is completed. At this time, even if the downstream part of the main horizontal pipe is cut in Step (b) and the upstream part is cut in this step, it does not fall and remains suspended from the underground ceiling through a separate band device. Alternatively, if necessary, work can be performed while it is safely supported using a separate lifting support device.

[0029] (f) Step of wrapping a rubber heater around the outer surface of the horizontal pipe and heating it to an appropriate temperature (S160)

[0030] Step (f) is a step of wrapping a rubber heater (13) around the outer surface of the horizontal pipe (10) requiring repair work after the completion of Step (e), as illustrated in FIG. 6, and then heating it to an appropriate temperature. Through this process, the horizontal pipe can be heated to an appropriate temperature. At this time, the rubber heater can be heated within a range of about 150 to 200°C, and the heat can be applied to the horizontal pipe. Through this step, the horizontal pipe made of cast iron can be preheated to an appropriate temperature.

[0031] (g) First sealing cap joining step (S170)

[0032] Step (g) is a step of first sealing caps (not shown in the drawing) on ​​the open upper and lower cut sections of the main horizontal pipe (10) or the open connecting cut sections of each branch pipe after the completion of Step (f), and by sealing caps, the cut open sections of the main horizontal pipe that require repair work can be closed.

[0033] (h) Primer first spray application step (S180)

[0034] Step (h) is a step of applying primer (10a) evenly in the first step by attaching an applicator to a sealing cap placed on each cut portion of the main horizontal pipe (10) or branch pipe (12) after the completion of Step (g). Through the above process, the inner surface of the main horizontal pipe (10) or the inner surface of each branch pipe (12) can be quickly and evenly coated with primer (10a). Here, although the sealing cap is not shown in the drawing, it may have various combination forms and is not limited to a specific shape as long as it is capable of achieving the function of sealing and covering each cut portion of the main pipe (10) or branch pipe (12). The applicator coupled to the sealing cap to evenly spray primer (10a) inside the main pipe (10) or branch pipe (12) may also have various spray combination structures and is not limited to a specific combination structure, as long as it is a structure capable of spraying and applying primer to the inside of the main pipe (10) or branch pipe (12) where each cut portion is covered by the sealing cap.

[0035] (i) First removal step of the sealing cap (S190)

[0036] (i) Step is a step of removing the sealing cap that blocks the cut portion of the main pipe or each branch pipe after the completion of Step (h), and each cut portion is opened again through the separation and removal of the sealing cap.

[0037] (j) First insertion step of rubber tube (S200)

[0038] Step (j) is a step in which, after completing Step (i), a release agent is applied to the outer surface through the downstream cut section of the horizontal pipe, and a rubber tube (14) in the shape of a rubber balloon with one end closed is inserted first as illustrated in FIG. 7. The rubber tube (14) is flexible and has the property of easily stretching under external force. Although the rubber tube is described as rubber, it is not limited to this, and it is of course possible to use various other materials to achieve the same purpose. In addition, it is desirable to position the closed part toward the upper cut section of the horizontal pipe and the open part toward the downstream cut section so that subsequent steps can be performed easily.

[0039] (k) Uniform distribution and curing step of primer using a rubber tube (S210)

[0040] Step (k) is a step in which, after Step (j), appropriate steam pressure is applied to the inside of the rubber tube through the open part of the rubber tube using a steam injector, and at the same time, the rubber tube (14) is forcibly heated and expanded outward as illustrated in FIG. 7, so that the primer (10a) is evenly distributed and cured with a uniform thickness. Through this step, the primer (10a) applied to the inner surface of the horizontal tube (10) can be forcibly distributed with a uniform thickness by the expansion pressure of the rubber tube (14) which is heated and pressurized by the steam pressure of the steam injector. The steam pressure applied to the rubber tube (14) may vary depending on the working environment or conditions, but it is preferable to perform it for about 30 to 60 minutes within a range of about 70 to 90°C. Accordingly, the primer (10a) sprayed on the inner surface of the horizontal pipe (10) is forcibly maintained in a state of even distribution within the aforementioned time range, and at the same time, heat from the rubber heater (13) is cut off during that time, allowing it to be rapidly cured by the heat of the horizontal pipe. At this time, as the primer (10a) is forcibly distributed uniformly by the expansion pressure of the rubber tube (14), it can be rapidly distributed even if the diameter of the horizontal pipe (10) is the same or different, as exemplified in (a) and (b) of FIG. 1. In particular, as the rubber tube (14) expands even into the interior of the branch pipe (12), there is an advantage that the uniform distribution and curing of the primer (10a) can be achieved stably, quickly, and easily. The primer used in this step can be various types, including epoxy primer, as long as it is a primer suitable for the repair application of the present invention.

[0041] (l) First separation and removal step of rubber tube (S220)

[0042] Step (l) is a step of removing steam pressure on the rubber tube (14) after completing Step (k) above, and simultaneously separating and removing the rubber tube from the inside of the horizontal tube (10) in the first step. At this time, since the rubber tube has a release agent applied to its outer surface, it can be easily separated and removed from the primer (10a).

[0043] (m) Secondary imaging inspection step of primer application status inside the horizontal tube (S230)

[0044] Step (m) is a step of inspecting and verifying in detail by taking a second endoscopic video (CCTV) to check the condition of the primer (10a) applied and cured inside the horizontal pipe (10) after Step (l). Through this inspection, it is possible to accurately check the condition of the primer applied and cured inside the horizontal pipe, and appropriate additional necessary measures, such as re-application work, can be taken based on the results.

[0045] (n) Secondary joining step of sealing cap (S240)

[0046] Step (n) is a step of joining the cut portions of the main pipe or each branch pipe by placing a sealing cap on them a second time for the next operation after Step (m).

[0047] (o) Secondary spray application step of epoxy resin (S250)

[0048] Step (o) is a step of applying epoxy resin (10b) as a second spray by attaching an applicator to each sealing cap placed through step (n) on the surface of the primer (10a) where the primer application and curing are completed through step (m). In this step, the epoxy resin can be applied quickly and evenly by using each sealing cap. The shape of the sealing cap for applying the epoxy resin (10b) as a second spray in this step, or the attachment structure of the applicator attached to the sealing cap, can be the same as the shape of the sealing cap or the attachment structure of the applicator applied to apply the primer in step (h).

[0049] (p) Secondary removal step of sealing cap (S260)

[0050] Step (p) is a step of secondarily removing the sealing cap blocking the cut portion of the main pipe or each branch pipe after the completion of Step (o), and each cut portion is opened again through the separation and removal of the sealing cap.

[0051] (q) Secondary insertion step of rubber tube (S270)

[0052] Step (q) is a step in which, after the completion of Step (p), a release agent is applied again to the outer surface through the downstream cut portion of the horizontal pipe (10), and a rubber tube (14) in the shape of a rubber balloon with one end blocked is inserted secondarily as illustrated in FIG. 9.

[0053] (r) Uniform distribution and curing step of epoxy resin using a rubber tube (S280)

[0054] Step (r) is a step in which, after Step (q), appropriate steam pressure is applied to the inside of the rubber tube (14) through an open part using a steam injector, and at the same time, the rubber tube (14) is forcibly heated and expanded outward as illustrated in FIG. 9, so that the epoxy resin (10b) applied to the surface of the primer (10a) is evenly distributed and cured with a uniform thickness. Through this step, the epoxy resin (10b) applied to the surface of the primer (10a) can be forcibly distributed with a uniform thickness by the expansion pressure of the rubber tube, which is forcibly heated and pressurized by the steam pressure. The steam pressure applied to the rubber tube may vary depending on the working environment or conditions, but it is preferable to maintain it for about 30 to 60 minutes within a range of about 70 to 90°C. Accordingly, the epoxy resin applied to the primer surface of the main pipe is forcibly maintained in a state of even distribution within the aforementioned time range, and at the same time, heat from the rubber heater is cut off during that time, allowing it to be rapidly cured by the heat of the main pipe heated. At this time, as the epoxy resin (10b) is forcibly distributed uniformly by the expansion pressure of the rubber tube (14), it can be rapidly distributed on the surface of the primer (10a) even if the diameter of the main pipe (10) is the same or different, as exemplified in (a) and (b) of FIG. 1. In particular, as the rubber tube (14) expands evenly into the interior of the branch pipe (12), there is an advantage that the uniform distribution and curing of the epoxy resin (10b) can be achieved stably, quickly, and easily.

[0055] (s) Secondary separation and removal step of rubber tube (S290)

[0056] Step (s) is a step of removing steam pressure on the rubber tube (14) after completing Step (r) above, and simultaneously separating and removing the rubber tube from the inside of the horizontal tube (10). At this time, since the rubber tube has a release agent applied to its outer surface, it can be easily separated and removed from the epoxy resin.

[0057] (t) Third imaging inspection stage of epoxy resin coating condition inside the horizontal pipe (S300)

[0058] Step (t) is a step of inspecting the coating state of the epoxy resin (10b) applied and cured on the inner primer surface of the horizontal pipe (10) after Step (s) by taking a third endoscopic camera (CCTV). Through this inspection, it is possible to accurately check the coating and cured state of the epoxy resin applied on the inner primer surface of the horizontal pipe, and appropriate additional necessary measures, such as re-coating work, can be taken based on the results.

[0059] (u) Rubber heater removal step (S310)

[0060] Step (u) is a step of removing the rubber heater (13) that was wrapped around the outer surface of the horizontal pipe (10) after the completion of Step (t). Of course, for work convenience, the rubber heater may be removed after the completion of Step (s), or it may be removed at an appropriate stage after Step (t).

[0061] (v) Final connection step of each cut section of the main horizontal pipe or branch pipe after the completion of the second coating process (S320)

[0062] Step (v) is a step in which, after the above step (u), the primer (10a) and epoxy resin (10b) are sequentially coated in two stages on the inner surface of the main horizontal pipe (10) or branch pipe (12) as illustrated in FIG. 10, and then the downstream and upstream cut sections of the main horizontal pipe (10) and the cut sections of each branch pipe (12) are finally connected and fixed using a connector (not shown in the drawing).

[0064] Accordingly, the present invention provides a repair method that involves each of the steps described above, through which the inner surface of an aged horizontal pipe (10) is sequentially coated with a primer (10a) and an epoxy resin (10b) as illustrated in FIG. 10. Through this, the aged horizontal pipe is repaired into a new pipe with the coating treatment completed, allowing it to be used without replacement. This significantly extends the service life of the horizontal pipe and provides several substantial advantages in the repair process, such as reducing or eliminating the risk of safety accidents that may occur during replacement work.

[0065] Meanwhile, regarding the maintenance work of the present invention, the order of the work steps is not necessarily carried out in the described order, and it goes without saying that the order may be changed as necessary.

[0066] Although the present invention has been described with reference to the accompanying drawings, the invention is not limited thereto, and it is obvious that many modifications and changes may be made within the scope of the following claims. Explanation of the symbols

[0067] 10: Main pipe 10a: Primer 10b: Epoxy resin 12: Branch pipe 13: Rubber heater 14: Rubber tube A: Preparation stage for repair work B: First primer coating stage C: Secondary epoxy resin coating step D: Finishing step

Claims

Claim 1 (a) A step of blocking the inflow of sewage or wastewater into the main horizontal pipe or the branch pipe branched from the main horizontal pipe (S110); (b) A step of first cutting the downstream section of the main horizontal pipe where repair work is required within a range where repair work is possible, while the inflow of sewage or wastewater is blocked through step (a) (S120); (c) A step of cleaning the inside of the main horizontal pipe thoroughly with high pressure using the first cut section downstream of the main horizontal pipe that was cut and opened through step (b) (S130); (d) A step of first inspecting the inside of the main horizontal pipe using endoscopic imaging (CCTV) to check the internal cleaning status of the main horizontal pipe after high-pressure cleaning is completed through step (c) (S140); (e) A step of secondarily cutting the upstream section of the main horizontal pipe where repair work is required or the connection part of each branch pipe branched from the main horizontal pipe after the completion of step (d) (S150); (f) Step (e) After completion, a step of wrapping a rubber heater around the outer surface of the main horizontal pipe requiring repair work and heating it to an appropriate temperature (S160); (g) After completion of step (f), a step of first sealing caps to be placed on the open upper and lower cut sections of the main horizontal pipe or the open connecting cut sections of each branch pipe to form a connection (S170); (h) After completion of step (g), a step of attaching an applicator to the sealing caps placed on each cut section of the main horizontal pipe or branch pipe to first evenly spray and apply a primer (S180); (i) After completion of step (h), a step of removing the sealing caps blocking the cut sections of the main horizontal pipe or each branch pipe (S190); (j) After completion of step (i), a step of first inserting a rubber tube in the shape of a rubber balloon with one end closed, into the outer surface through the lower cut section of the main horizontal pipe where a release agent is applied (S200); (k) After step (j), A step (S210) of providing appropriate steam pressure using a steam injector through the open part of the rubber tube and simultaneously pressurizing and heating the rubber tube so that the primer is evenly distributed and cured with a uniform thickness;(l) After completing step (k) above, a step of removing steam pressure on the rubber tube and simultaneously separating and removing the rubber tube from the inside of the main horizontal pipe in the first step (S220); (m) After step (l) above, a step of inspecting by taking a second endoscopic video (CCTV) to check the state of the primer applied and cured inside the main horizontal pipe (S230); (n) After step (m) above, a step of re-sealing and joining the cut portion of the main horizontal pipe or each branch pipe in the second step for the next operation (S240); (o) A step of attaching an applicator to each sealing cap placed in step (n) on the primer surface where the primer application and curing are completed through step (m) above and spraying epoxy resin in the second step (S250); (p) After completing step (o) above, a step of removing the sealing cap blocking the cut portion of the main horizontal pipe or each branch pipe in the second step (S260); (q) After completing step (p) above, (S270) a step of reapplying a release agent to the outer surface through the downstream cut portion of the horizontal main pipe and inserting a rubber tube in the shape of a rubber balloon with one end closed as a second step; (r) after step (q), a step of providing appropriate steam pressure using a steam injector through the open part of the rubber tube and simultaneously pressurizing and heating the rubber tube so that the epoxy resin applied to the primer surface is evenly distributed and cured with a uniform thickness (S280); (s) after the completion of step (r), a step of removing the steam pressure on the rubber tube and simultaneously separating and removing the rubber tube from the inside of the horizontal main pipe as a second step (S290); (t) after step (s), a step of inspecting by taking a third endoscopic video (CCTV) to check the coating state of the epoxy resin applied and cured on the inner primer surface of the horizontal main pipe (S300); (u) after the completion of step (t), removing the rubber heater wrapped around the outer surface of the horizontal main pipe. Step (S310); (v) After Step (u), finally connecting and fixing the downstream and upstream cut sections of the main horizontal pipe and the cut sections of each branch pipe using a connector (S320);Repair method for aging horizontal pipes characterized by being repaired through [the process]. Claim 2 A repair method for aging horizontal pipes according to claim 1, characterized in that in step (f) above, the rubber heater is heated within a range of about 150 to 200℃. Claim 3 A repair method for aging horizontal pipes according to claim 1, characterized in that the steam pressure provided inside the rubber tube in step (k) or step (r) is maintained within the range of 70 to 90°C for about 30 to 60 minutes.

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