KR102599932B1 - Non-woven structure of non-excavated liner for repairing drainpipes and non-excavated liner and construction method using thereof - Google Patents

Abstract

The present invention relates to a nonwoven fabric for manufacturing a liner for trenchless sewer pipe repair, which is manufactured using needle-punched nonwoven fabric or thermal bonding nonwoven fabric to uniformly impregnate a thermosetting resin, and a nonwoven fabric for repairing trenchless sewer pipes that has excellent surface smoothness after curing of the thermosetting resin. This relates to a construction method for a liner for trenchless sewer pipe repair that can be towed into the interior of the sewer pipe to be repaired in its original form without being deformed or torn during construction.

Description

Non-woven fabric for manufacturing non-excavated sewer pipe repair liners, non-excavated sewer pipe repair liners manufactured therefrom, and construction method thereof { Non-woven structure of non-excavated liner for repairing drainpipes and non-excavated liner and construction method using its }

The present invention relates to a nonwoven fabric for manufacturing a liner for trenchless sewer pipe repair, which is manufactured using needle-punched nonwoven fabric or thermal bonding nonwoven fabric to uniformly impregnate a thermosetting resin, and a nonwoven fabric for repairing trenchless sewer pipes that has excellent surface smoothness after curing of the thermosetting resin. This relates to a construction method for a liner for trenchless sewer pipe repair that can be towed into the interior of the sewer pipe to be repaired in its original form without being deformed or torn during construction.

As demand for maintenance of old sewer pipes increases due to the recent safe supply of tap water and sinkholes, interest in construction methods that can easily and quickly maintain and repair old sewer pipes is increasing. For the maintenance and repair of urban infrastructure such as sewer pipes, non-excavating methods are mainly used to minimize traffic obstacles and increase efficiency.

The demand for non-dig construction methods for old sewer pipes is expected to gradually increase because construction can be carried out quickly with a small budget in narrow alleys or congested cities. In particular, the non-excavation method using a sewer pipe repair liner has the advantage of shortening the repair construction period because ground excavation work can be omitted, and preventing traffic disruptions and safety accidents during excavation.

The non-excavating method of repairing old sewer pipes using a sewer pipe repair liner is usually a first-stage process of dredging and cleaning the inside of the sewer pipe, and a second process of cutting the protruding part of the connection pipe and conducting a detailed investigation of the pipe using CCTV cameras, etc. Step process, 3-step process of impregnating the sewer pipe repair liner with thermosetting resin and then moving it to the site using a refrigerated truck; 4-step process of inserting the sewer pipe repair liner into the sewer pipe through water pressure, air pressure, or traction process; sewer pipe repair A 5-step process of injecting hot water or steam into the liner to heat-cure the thermosetting resin impregnated within the liner, a 6-step process of cutting both sides of the sewer pipe and organizing the inlet, a 7-step process of opening and finishing the connection pipe, and the final process. It consists of an 8-step process that includes a final inspection of the sewer pipe.

Looking at the prior art regarding such a trenchless sewer pipe repair liner, Republic of Korea Patent Publication No. 10-1466976 includes a velour-type needle-punched nonwoven fabric layer with piles formed, an acrylic resin reinforcement layer formed on the lower part of the nonwoven fabric layer, and the above. A velor needle-punched non-woven fabric structure for manufacturing a sewer pipe repair liner consisting of a polyethylene layer formed by extrusion coating on the lower part of an acrylic resin reinforcement layer is disclosed, and Korean Patent Publication No. 10-2324377 discloses an upper web, a lower web, and the upper web. An anisotropic liner for sewer pipe repair, including a non-woven composite provided between the and the lower web and a waterproof layer provided on one side of the non-woven composite and formed by melting and coating a waterproofing resin composed of polyethylene, polypropylene, or thermoplastic polyurethane. is disclosed.

Conventional trenchless sewer pipe repair liners form a coating layer by extruding and coating thermosetting resin through a T-die, etc. to prevent the flow of thermosetting resin impregnated in the resin reinforcement layer made of non-woven fabric. It becomes difficult to uniformly impregnate the lower part of the resin reinforcement layer with thermosetting resin.

Accordingly, when the thermosetting resin impregnated in the resin reinforcement layer is cured, the surface of the resin reinforcement layer is hardened unevenly, and a difference in strength of the sewer pipe repair liner occurs.

The present invention provides a non-woven fabric for manufacturing a sewer pipe repair liner that can facilitate the production of a trenchless sewer pipe repair liner with excellent physical properties, and a non-woven fabric for manufacturing a sewer pipe repair liner that can be used to uniformly impregnate the non-woven fabric layer with a thermosetting resin. A non-woven fabric for manufacturing a non-dig sewer pipe repair liner, which has the effect of simplifying the manufacturing process of a sewer pipe repair liner and increasing productivity by omitting the attachment process of a sealing tape attached to the sewing part of the non-woven fabric layer, and a non-woven fabric therefrom The purpose is to provide a liner for repairing trenchless sewer pipes and its construction method. However, the technical problem to be achieved by the present invention is not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

The nonwoven fabric for manufacturing a liner for trenchless sewer pipe repair according to the present invention to solve the above problem may be made of a nonwoven fabric made of at least one of polypropylene fibers and polyethylene terephthalate fibers, and the nonwoven fabric is a needle-punched nonwoven fabric or a long fiber nonwoven fabric. It is desirable to be

In addition, the nonwoven fabric for manufacturing a trenchless sewer pipe repair liner according to the present invention is for manufacturing a tubular sewer pipe repair liner, and includes a first film layer; A non-woven fabric layer provided on top of the first film layer; A sewing unit for sewing the non-woven fabric layer to form a tube shape; and a second film layer provided on top of the non-woven fabric layer, wherein the non-woven fabric layer may be provided alone or in a plurality of layers depending on the construction thickness of the trenchless sewer pipe repair liner. The first film layer and the second film layer are preferably any one of a high-density polyethylene film, a low-density polyethylene film, and a polypropylene film.

And, the construction method of the liner for trenchless sewer pipe repair according to the present invention includes: i) a first step of dredging and cleaning the inside of the sewer pipe to be repaired; ii) a second step of impregnating the liner for trenchless sewer pipe repair with a thermosetting resin and then transporting it to the site using a refrigerated vehicle; iii) a third step of inserting the first polyethylene long fiber non-woven fabric sheet into the inner lower part of the sewer pipe to be repaired; iv) Repair in the third step together with a non-dig sewer pipe repair liner impregnated with a thermosetting resin through a traction process and a second polyethylene long fiber nonwoven fabric sheet provided at the lower part of the thermosetting resin-impregnated non-dig sewer pipe repair liner. A fourth step of pulling to the top of the first polyethylene long fiber non-woven fabric sheet inserted into the inner lower part of the target's sewer pipe; v) a fifth step of removing the first polyethylene long fiber nonwoven fabric sheet and the second polyethylene long fiber nonwoven fabric sheet; vi) a sixth step of injecting hot water or steam into the interior of the trenchless sewer pipe repair liner impregnated with the thermosetting resin to expand the trenchless sewer pipe repair liner while curing the impregnated thermosetting resin; vii) a seventh step of cutting the non-dig sewer pipe repair liner protruding on both sides of the sewer pipe to be repaired; ⅷ) Step 8 of opening and finishing the sewer pipe subject to repair; and ix) a ninth step of finally inspecting the sewer pipe subject to repair.

According to the nonwoven fabric for manufacturing a trenchless sewer pipe repair liner according to the present invention and the trenchless sewer pipe repair liner manufactured therefrom, the nonwoven fabric layer provided on one side of the trenchless sewer pipe repair liner can be uniformly impregnated with a thermosetting resin. This has the effect of enabling the construction of a trenchless sewer pipe repair liner with a smooth surface after curing and excellent strength. In addition, when manufacturing the trenchless sewer pipe repair liner, the attachment process of a sealing tape attached to the sewing portion of the nonwoven fabric layer is unnecessary, which has the effect of simplifying the manufacturing process of the trenchless sewer pipe repair liner and increasing productivity. . In particular, the trenchless sewer pipe repair liner according to the present invention can be smoothly pulled into the sewer pipe to be repaired after being impregnated with a thermosetting resin, without deforming the trenchless sewer pipe repair liner impregnated with the thermosetting resin. It has the advantage of being able to be towed into the sewer pipe to be repaired in its original form.

Figure 1 is a schematic diagram of a liner for sewer pipe repair according to the prior art;
Figure 2 is a photograph of the surface of a sewer pipe repair liner according to the prior art (a) and a photograph of the inner side of a sewer pipe constructed according to the prior art (b);
Figure 3 is a schematic diagram of a liner for trenchless sewer pipe repair according to the present invention;
Figure 4 is a process diagram for constructing a trenchless sewer pipe repair liner according to the present invention.

In this application, terms such as “comprise,” “have,” or “equipped with” are intended to designate the presence of features, numbers, steps, components, parts, or combinations thereof described in the specification, and are not intended to indicate the presence of one or more other features, numbers, steps, components, parts, or combinations thereof. It should be understood that this does not exclude in advance the possibility of the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.

Additionally, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless clearly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

Below, preferred embodiments of the present invention will be described in more detail with reference to the attached drawings. In order to facilitate overall understanding when describing the present invention, the same reference numerals are used for the same components in the drawings, and duplicate descriptions for the same components are omitted.

Hereinafter, the nonwoven fabric for manufacturing a trenchless sewer pipe repair liner according to the present invention and the trenchless sewer pipe repair liner 100 manufactured therefrom will be described in detail with reference to the accompanying drawings. Figure 1 attached to the present invention is a schematic diagram of a sewer pipe repair liner according to the prior art, and Figure 2 is a photograph of the surface of the liner for repairing sewer pipes according to the prior art (a) and a photograph of the inner side of the constructed sewer pipe (b). , Figure 3 is a schematic diagram of a liner for trenchless sewer pipe repair according to the present invention, and Figure 4 is a process diagram for constructing a trenchless sewer pipe repair liner according to the present invention.

The nonwoven fabric for manufacturing a trenchless sewer pipe repair liner according to the present invention is preferably made of at least one of polypropylene (PP) fibers and polyethylene terephthalate (PET) fibers.

The non-woven fabric is a textile product made by entangling various fibers according to their mutual characteristics to form a sheet (cloth)-shaped web and combining them by mechanical and physical methods without going through processes such as twisting, weaving, and knitting. It has a variety of uses, high productivity, and unique functions can be added by applying post-processing technology, so it has a variety of uses and can increase added value.

The PP is one of the thermoplastic synthetic resins and has light and flexible characteristics, and PET is a synthetic resin with high transparency and excellent thermal insulation properties. The PP fiber and PET fiber can be manufactured by melt spinning the PP and PET.

The PP fibers and PET fibers manufactured as above can be made into needle-punched nonwoven fabric or long-fiber nonwoven fabric to manufacture the liner for trenchless sewer pipe repair according to the present invention.

The above nonwoven fabric can be manufactured through a web forming process and a web bonding process, and can be classified into a wet method or a dry method depending on the web forming method, and also needle punching and thermal bonding depending on the web bonding. It can be divided into thermal bonding, meltblown, spunlace, stitch bonding, etc.

In other words, needle-punched non-woven fabric refers to a non-woven fabric manufactured by punching fibers using a special needle. Nonwoven fabric is formed by punching a web of several layers of fiber sheets using the special needle, and the thickness of the nonwoven fabric produced can be varied depending on the number of punches or the density of the special needle.

In addition, long fiber nonwoven fabric refers to a nonwoven fabric manufactured using long fibers rather than single fibers with a certain length.

Since the needle-punched nonwoven fabric can be used by laminating multiple layers, it has the characteristic of being easy to adjust the construction thickness of the trenchless sewer pipe repair liner 100 installed in the sewer pipe to be repaired. In addition, the long-fiber nonwoven fabric has a smooth surface, enabling the formation of a uniform surface when the first film layer 10, which will be described later, is removed after curing of the thermosetting resin. Therefore, it is preferable to use needle-punched non-woven fabric or long-fiber non-woven fabric as the non-woven fabric for manufacturing the liner for trenchless sewer pipe repair according to the present invention.

The nonwoven fabric for manufacturing the liner for trenchless sewer pipe repair according to the present invention can be manufactured as described above, and the liner 100 for trenchless sewer pipe repair according to the present invention is the nonwoven fabric for manufacturing the liner for trenchless sewer pipe repair manufactured as described above. It can be manufactured using

That is, the liner 100 for trenchless sewer pipe repair according to the present invention is manufactured in a tubular shape and, as shown in FIG. 3, includes a first film layer 10; A non-woven fabric layer (20) provided on the first film layer (10) and made of non-woven fabric for manufacturing the sewer pipe repair liner; A sewing unit 50 for sewing the non-woven fabric layer 20 to form a tube shape; and a second film layer 30 provided on the non-woven fabric layer 20.

Looking at this in detail, the first film layer 10 may be provided in a tube shape as shown in FIG. 3.

That is, as shown in Figure 1, the sewer pipe repair liner according to the prior art is attached to the resin reinforcement layer 3 made of non-woven fabric by applying heat and pressure while extruding a thermoplastic resin, that is, polyethylene, with a T-die on the inside. A polyethylene layer (4) is provided.

At this time, the resin reinforcement layer 3 is formed by stacking a plurality of nonwoven fabric layers according to the construction thickness of the sewer pipe repair liner. That is, when the construction thickness of the sewer pipe repair liner is thin, a single non-woven fabric layer can be provided, and when the construction thickness of the sewer pipe repair liner is thick, a plurality of non-woven fabric layers (3-1, 3-2 and 3-3) are stacked to manufacture and construct a sewer pipe repair liner.

However, as the resin reinforcement layer 3 is compressed by the heat and pressure applied during the formation of the polyethylene layer 4 as described above, the density of the nonwoven fabric constituting the resin reinforcement layer 3 increases.

As the density of the non-woven fabric constituting the resin reinforcement layer 3 increases as described above, when the resin reinforcement layer 3 is composed of a plurality of non-woven fabric layers, the polyethylene layer 4 is formed at the bottom of the resin reinforcement layer 3-1. A difference in density occurs between the nonwoven fabric layers constituting the resin reinforcement layers (3-2, 3-3) that do not include the polyethylene layer (4). Accordingly, the non-woven fabric layer constituting the resin reinforcement layer (3-2, 3-3) without the polyethylene layer (4) has a low density, so the amount of impregnated thermosetting resin increases. On the other hand, the resin reinforcement layer (3-1) formed below the polyethylene layer (4) is impregnated by increasing the density of the non-woven fabric layer forming the resin reinforcement layer (3) due to the heat and pressure applied during the formation of the polyethylene layer (4). The amount of thermosetting resin is reduced. Therefore, when the resin reinforcement layer 3 is composed of a plurality of nonwoven fabric layers, the thermosetting resin impregnated into the resin reinforcement layer 3 is unevenly impregnated.

In the case where the thermosetting resin is unevenly impregnated into the resin reinforcement layer 3 as described above, when the sewer pipe repair liner is put into the sewer pipe for construction, the strength of the sewer pipe repair liner in which the thermosetting resin has been cured may harden unevenly. there is.

The polyethylene layer (4) provided as above is essential to prevent the flow of the thermosetting resin impregnated into the resin reinforcement layer (3), but when forming the polyethylene layer (4), the polyethylene layer (4) is applied to the resin reinforcement layer (3). The thermosetting resin may be unevenly impregnated along the thickness of the resin reinforcement layer 3 due to heat and pressure.

In particular, when the construction thickness of the liner installed in the sewer pipe to be repaired is thick, the construction is performed to match the construction thickness by laminating a plurality of non-woven fabric layers constituting the resin reinforcement layer 3. In this way, a plurality of non-woven layers are laminated. When constructing a liner manufactured by lamination, a resin reinforcement layer (3-1) having the polyethylene layer (4) at the bottom and a resin reinforcement layer (3-2, 3-) not having the polyethylene layer (4) are laminated. 3) A difference in density occurs between the two. Accordingly, the thermosetting resin impregnated into the resin reinforcement layer 3 is not uniformly impregnated.

If the thermosetting resin is not uniformly impregnated as described above, the strength of the sewer pipe repair liner may be hardened unevenly after curing of the thermosetting resin.

Therefore, the present invention does not have a polyethylene layer 4 formed through extrusion of polyethylene, which can make the density of the non-woven fabric layer 20 non-uniform as described above, but instead has the non-woven fabric layer 20 as shown in FIG. 3. It is characterized by having a first film layer 10 on the inside.

That is, in order to prevent the flow of the thermosetting resin impregnated into the non-woven fabric layer 20 without forming the polyethylene layer 4 formed through the extrusion process as described above, a first film layer ( By providing 10), the process of applying heat and pressure required when forming the polyethylene layer 4 becomes unnecessary.

As described above, the process of applying heat and pressure to the non-woven fabric layer 20 becomes unnecessary, so that the density of the non-woven fabric layer 20 is maintained uniformly throughout even when the non-woven fabric layer 20 is provided in plurality, so that the thermosetting resin Impregnation can be achieved uniformly.

In addition, the thermosetting resin usually used for repairing sewer pipes is mainly unsaturated PET resin. The unsaturated PET resin itself has a high viscosity, so it may be difficult to impregnate the nonwoven fabric layer 20, so it is manufactured by adding styrene monomer to lower the viscosity of the unsaturated PET resin.

However, the unsaturated PET resin manufactured by adding styrene monomer as described above uses steam when curing. When steam is used to cure the unsaturated PET resin as described above, the curing reaction of the unsaturated PET resin is performed at 200 to 220°C, but the volatilization temperature of the styrene monomer contained in the unsaturated PET resin is 145°C.

Therefore, when the unsaturated PET resin prepared by adding styrene monomer is cured using steam as described above, volatilization of the styrene monomer occurs.

Accordingly, when the vapor pressure of the styrene monomer becomes greater than the construction pressure applied to the inside of the liner during construction, the styrene monomer contained in the unsaturated PET resin is volatilized and discharged to the outside of the unsaturated PET resin.

In this case, if the curing speed of the unsaturated PET resin is very fast or the content of styrene monomer in the unsaturated PET resin is high, the styrene monomer volatilized during curing of the unsaturated PET resin may cause damage to the sewer pipe repair liner 100. The phenomenon of forming bubble marks on the inner surface as shown in Figure 2 may often occur. The surface of the sewer pipe repair liner may become uneven due to the bubble marks generated by the volatilization of the styrene monomer as described above.

As the surface of the sewer pipe repair liner is hardened unevenly as described above, the overall surface of the sewer pipe repair liner installed inside the sewer pipe to be repaired may be hardened unevenly, as shown in Figures 2 (a) and (b). there is.

However, the trenchless sewer pipe repair liner 100 according to the present invention is provided with a first film layer 10 that is removed after construction without forming a polyethylene layer 4 on the inside, so that it hardens unevenly on the surface as shown in FIG. 2. The phenomenon disappears.

That is, since the first film layer 10 according to the present invention is not physically or chemically adhered to the nonwoven fabric layer, when the thermosetting resin impregnated in the nonwoven fabric layer 20 is cured, the nonwoven fabric layer 20 and the first film layer 10 are not physically or chemically bonded to the nonwoven fabric layer 20. 1 Since there is no bubble generation due to styrene monomer at the boundary of the film layer 10, the inner surface of the repaired sewer pipe can be formed in a uniform state. Additionally, if the first film layer 10 is removed after the thermosetting resin has hardened, the inner surface of the repaired sewer pipe can be repaired in a smooth state without generating bubbles due to styrene monomer.

After the first film layer 10 is provided as described above, the non-woven fabric layer 20 is provided on top of the first film layer 10.

According to the present invention, the non-woven fabric layer 20 may be composed of a needle-punched non-woven fabric or a long-fiber non-woven fabric made of one or more of PP fibers and PET fibers.

The nonwoven fabric layer 20 provided as described above is later impregnated with a thermosetting resin to fill the voids formed inside the nonwoven fabric layer 20. Afterwards, the thermosetting resin is cured to form a nonwoven fabric layer 20 containing the thermosetting resin.

According to the present invention, the non-woven fabric layer 20 may preferably be made of a non-woven fabric having a basis weight of 200 to 900 g/m2 to facilitate impregnation of the thermosetting resin. If the basis weight of the non-woven fabric layer 20 is less than 200 g/m2, the density of the fibers constituting the non-woven fabric is low, so binding of the fibers through the needle punching process is incomplete, and thus the production of the non-woven fabric may be uneven. Additionally, if the basis weight of the nonwoven fabric layer 20 exceeds 900 g/m2, manufacturing the nonwoven fabric may be difficult. Therefore, the nonwoven fabric layer 20 according to the present invention can be made of a nonwoven fabric having a basis weight of 200 to 900 g/m2, which can be appropriately selected and manufactured depending on the thickness of the nonwoven fabric layer 20.

In addition, according to the present invention, the non-woven fabric layer 20 can be used alone or formed of multiple layers depending on the construction thickness of the sewer pipe repair liner 100 to be constructed in the sewer pipe to be repaired. That is, when the construction thickness of the sewer pipe repair liner 100 to be constructed in the sewer pipe to be repaired is small, it is preferable to form the non-woven fabric layer 20 as a single layer and construct it, and the sewer pipe repair liner 100 In the case where the construction thickness is large, by providing a plurality of the non-woven fabric layers 20, the construction can be appropriately performed according to the construction thickness of the sewer pipe repair liner 100 to be constructed in the sewer pipe to be repaired.

The non-woven fabric layer 20 provided as described above is made by cutting a sheet-shaped non-woven fabric to have a certain width, placing both ends of the cut non-woven fabric face to face, and using thread to separate the two ends of the non-woven fabric facing each other at intervals of 4 to 7 mm. The sewing portions are connected and sewn to form the sewing portion 50. By forming the sewing portion 50 as described above, the sheet-shaped nonwoven fabric layer 20 can be manufactured into a tube shape.

According to the present invention, the sewing portion 50 can be formed appropriately according to the diameter of the sewer pipe repair liner 100. That is, when the diameter of the sewer pipe repair liner 100 is large, the sewing portion 50 can be formed at a plurality of positions, and when the diameter of the sewer pipe repair liner 100 is small, it can be sewn at a single position. Unit 50 may be formed.

According to the prior art, as shown in FIG. 1, after forming the sewing portion 5 and manufacturing the resin reinforcement layer 3 in a tube shape, a sealing tape 6 with a width of 50 to 100 mm is applied to the sewing portion ( 5) It is heat-compressed at the top. By thermally compressing the sealing tape 6 as described above, it is possible to prevent pressure or thermosetting resin from leaking through the sewing portion 50.

That is, the sewing portion 5 is sealed by heat-compressing the sealing tape 6 on the upper part of the sewing portion 5. By sealing the sewing portion 5, the sewer pipe repair liner 100 can be inserted into the sewer pipe to be repaired by applying air or water pressure. Additionally, it is possible to prevent thermosetting resin from leaking through the sewing portion 5.

As shown in FIG. 3, the tubular sewer pipe repair liner 100 according to the present invention has a first film layer 10 provided on the inside of the non-woven fabric layer 20 on which the sewing portion 50 is formed, using water pressure or air pressure. When the sewer pipe repair liner 100 is inserted into the sewer pipe, it is sealed and the sewer pipe repair liner 100 is brought into close contact with the inside of the sewer pipe to be repaired. In addition, as shown in FIG. 3, the second film layer 30 provided on the top of the nonwoven fabric layer 20 on which the sewing portion 50 is formed seals the sewing portion 50 and also prevents contamination of the thermosetting resin and It plays a role in preventing leakage.

That is, the first film layer 10 according to the present invention expands the sewer pipe repair liner 100 to adhere closely to the inside of the sewer pipe to be repaired, and the second film layer 30 seals the sewing portion 50. It can be provided to seal and prevent contamination and leakage of the impregnated thermosetting resin.

According to the present invention, the first film layer 10 and the second film layer 30 can be made of polyolefin-based films, especially high-density polyethylene (HDPE) films and low-density polyethylene (Low-density polyethylene) films. It may be desirable to use either LDPE) film or polypropylene (PP) film.

The tubular sewer pipe repair liner 100 according to the present invention as described above can be constructed in the following manner.

In other words, the construction method of repairing an old sewer pipe 200 using the trenchless sewer pipe repair liner 100 according to the present invention includes: i) the first step of dredging and cleaning the inside of the sewer pipe 200 to be repaired; ; ii) a second step of impregnating the trenchless sewer pipe repair liner 100 with a thermosetting resin and then moving it to the site using a refrigerator; iii) a third step of inserting the first polyethylene long fiber nonwoven fabric sheet 110 into the inner lower part of the sewer pipe 200 to be repaired; iv) A non-dig sewer pipe repair liner (100) impregnated with a thermosetting resin through a traction process and a second polyethylene long fiber nonwoven sheet (120) provided on the lower part of the non-dig sewer pipe repair liner (100) impregnated with the thermosetting resin. ) together to the upper part of the first polyethylene long fiber nonwoven fabric sheet 110 inserted into the inner lower part of the sewer pipe 200 to be repaired in the third step; v) a fifth step of removing the first polyethylene long fiber nonwoven fabric sheet 110 and the second polyethylene long fiber nonwoven fabric sheet 120; vi) A sixth step of curing the impregnated thermosetting resin while injecting hot water or steam into the interior of the liner 100 for trenchless sewer pipe repair impregnated with the thermosetting resin to expand the liner 100 for trenchless sewer pipe repair. ; vii) a seventh step of cutting the non-dig sewer pipe repair liner (100) protruding on both sides of the sewer pipe (200) to be repaired; ⅷ) Step 8 of opening and finishing the sewer pipe 200 to be repaired; and ix) a ninth step of finally inspecting the sewer pipe 200 to be repaired.

In other words, the construction method of repairing an old sewer pipe 200 using the trenchless sewer pipe repair liner 100 according to the present invention is the first step, which involves dredging and cleaning the inside of the sewer pipe 200 to be repaired. The steps are performed. The first step is a step of removing contaminants present inside the sewer pipe 200 to be repaired, and can be performed by spraying water using a dredger or the like.

After performing the first step, the second step is to impregnate the trenchless sewer pipe repair liner 100 with a thermosetting resin and then move it to the site using a refrigerator. It is preferable that the trenchless sewer pipe repair liner 100 impregnated with the thermosetting resin as described above is transported to the site using a refrigerator or the like to prevent hardening of the impregnated thermosetting resin.

As shown in FIG. 4, the third step in the construction method of the trenchless sewer pipe repair liner 100 according to the present invention is to install a first polyethylene long fiber nonwoven sheet 110 on the inner lower part of the sewer pipe 200 to be repaired. ) is performed.

The first polyethylene long fiber nonwoven sheet 110 is inserted at the construction site using a winch or a CCTV robot that observes the inside of the sewer pipe to be repaired.

As described above, when the first polyethylene long fiber nonwoven sheet 110 is inserted into the inner lower part of the sewer pipe 200 to be repaired, a thermosetting resin-impregnated non-excavating material is inserted through a traction process in the fourth step described later. It comes into contact with the second polyethylene long fiber nonwoven fabric sheet 120 provided at the lower part of the sewer pipe repair liner 100. Since the PET long fiber nonwoven fabric sheet exhibits a low coefficient of friction, the second polyethylene long fiber nonwoven fabric sheet 120 in contact with the first polyethylene long fiber nonwoven fabric sheet 110 can be easily moved to the inside of the sewer pipe 200 to be repaired. can be towed.

That is, when the sewer pipe 200 is repaired without digging according to the prior art, if there is a protrusion on the inside of the sewer pipe 200, the liner 100 may be torn when towed. Additionally, if the weight of the liner 100 is heavy, the liner 100 may be deformed due to external force applied during traction.

After performing the third step, as a fourth step, as shown in FIG. 4, a trenchless sewer pipe repair liner 100 impregnated with a thermosetting resin through a pulling process and a trenchless sewer pipe impregnated with the thermosetting resin are formed. The first polyethylene long fiber nonwoven fabric sheet 110 inserted into the inner lower part of the sewer pipe 200 to be repaired in the third step together with the second polyethylene long fiber nonwoven sheet 120 provided at the lower part of the repair liner 100. ) is carried out to the upper part of the.

When inserting the sewer pipe repair liner 100 according to the prior art into the sewer pipe 200 to be repaired, it is reversed using water pressure or pneumatic pressure, or is inserted into the sewer pipe 200 to be repaired through a traction process. do. The trenchless sewer pipe repair liner 100 according to the present invention is not inserted reversely using water pressure or pneumatic pressure, but is inserted into the sewer pipe 200 to be repaired through a traction process.

A non-dig sewer pipe repair liner (100) impregnated with a thermosetting resin on the inner lower part of the sewer pipe (200) to be repaired, and a second polyethylene provided on the lower part of the non-dig sewer pipe repair liner (100) impregnated with the thermosetting resin. When the long-fiber nonwoven fabric sheet 120 is towed, the thermosetting resin-impregnated non-dig sewer pipe repair liner 100 and the thermosetting resin-impregnated non-dig sewer pipe repair liner 100 are provided below. As shown in FIG. 4, the polyethylene long fiber nonwoven fabric sheet 120 is inserted and seated on top of the first polyethylene long fiber nonwoven fabric sheet 110 inserted in the third step.

As described above, a trenchless sewer pipe repair liner 100 impregnated with a thermosetting resin is provided on the upper part of the first polyethylene long fiber nonwoven fabric sheet 110 and a bottom of the trenchless sewer pipe repair liner 100 impregnated with the thermosetting resin. When the second polyethylene long fiber nonwoven fabric sheet 120 is seated, the first polyethylene long fiber nonwoven fabric sheet 110 and the second polyethylene long fiber nonwoven fabric sheet 120 come into contact with each other, and the PET long fiber nonwoven fabric sheet is Since it exhibits a low coefficient of friction, the second polyethylene long fiber nonwoven fabric sheet 120 in contact with the first polyethylene long fiber nonwoven fabric sheet 110 can be easily pulled to the inside of the sewer pipe 200 to be repaired. That is, the no-dig sewer pipe repair liner 100 impregnated with a thermosetting resin is installed in the sewer pipe 200 using the first polyethylene long fiber nonwoven fabric sheet 110 and the second polyethylene long fiber nonwoven fabric sheet 120 having a low coefficient of friction. ), it is possible to prevent tearing and deformation of the non-dig sewer pipe repair liner 100 as in the prior art.

After performing the fourth step, the fifth step is to remove the first polyethylene long fiber nonwoven fabric sheet 110 and the second polyethylene long fiber nonwoven fabric sheet 120. The first polyethylene long fiber nonwoven fabric sheet 110 and the second polyethylene long fiber nonwoven fabric sheet 120 allow the thermosetting resin-impregnated trenchless sewer pipe repair liner 100 to be easily inserted into the sewer pipe 200 to be repaired. Since it is for towing, the non-dig sewer pipe repair liner 100 impregnated with thermosetting resin through the fourth step as described above is towed to the inside of the sewer pipe 200 to be repaired, and then the first polyethylene long fiber nonwoven fabric sheet ( 110) and the second polyethylene long fiber nonwoven sheet 120 are preferably removed.

In addition, the sixth step according to the present invention is to inject hot water or steam into the interior of the thermosetting resin-impregnated trenchless sewer pipe repair liner 100, which is pulled into the interior of the sewer pipe 200 to be repaired, thereby forming the trenchless sewer pipe. A step of curing the impregnated thermosetting resin is performed while expanding the repair liner 100. That is, the trenchless sewer pipe repair liner 100 impregnated with the thermosetting resin is expanded by the hot water or steam injected in the sixth step and comes into close contact with the inside of the sewer pipe 200 to be repaired. At this time, the curing reaction of the thermosetting resin impregnated in the trenchless sewer pipe repair liner 100 proceeds by the hot water or steam injected as described above.

After performing the sixth step, in the seventh step, the trenchless sewer pipe repair liner 100 protruding on both sides of the sewer pipe 200 to be repaired is cut. The cutting process as described above can be performed by inserting a cutting robot into the sewer pipe 200 to be repaired to cut the trenchless sewer pipe repair liner 100 protruding on both sides of the sewer pipe 200 to be repaired.

The eighth step according to the present invention is a step of opening and finishing the sewer pipe 200 to be repaired, and after the eighth step, the ninth step is a final inspection of the sewer pipe 200 to be repaired. It can be included. In the ninth step, the construction status can be finally inspected by inserting CCTV into the sewer pipe 200 to be repaired.

When the ninth step is completed as described above, construction of the trenchless sewer pipe repair liner 100 according to the present invention can be completed.

According to the nonwoven fabric for manufacturing a trenchless sewer pipe repair liner according to the present invention and the trenchless sewer pipe repair liner 100 manufactured therefrom, a thermosetting resin is added to the nonwoven fabric layer 20 provided on one side of the sewer pipe repair liner 100. The impregnation can be made uniform, which has the effect of enabling the construction of a sewer pipe repair liner 100 with a smooth surface and excellent strength. In addition, when manufacturing the sewer pipe repair liner 100, the attachment process of a sealing tape attached to the sewing portion 50 of the non-woven fabric layer 20 is unnecessary, thereby simplifying the manufacturing process of the sewer pipe repair liner 100 and increasing productivity. It has the effect of increasing .

In addition, according to the construction method of the trenchless sewer pipe repair liner according to the present invention, the trenchless sewer pipe repair liner 100 impregnated with the thermosetting resin as described above can be smoothly pulled into the sewer pipe to be repaired. That is, the first polyethylene long fiber nonwoven fabric sheet 110 and the second polyethylene long fiber nonwoven fabric sheet 120 provided at the lower part of the thermosetting resin-impregnated non-dig sewer pipe repair liner 100 have a small coefficient of friction, so when they contact, It is possible to smoothly pull the trenchless sewer pipe repair liner 100 impregnated with thermosetting resin into the interior of the sewer pipe 200 to be repaired with a small amount of force.

In addition, by using the first polyethylene long fiber nonwoven fabric sheet 110 and the second polyethylene long fiber nonwoven fabric sheet 120 as described above, the non-dig sewer pipe repair liner 100 impregnated with the thermosetting resin can be pulled with a small force. This becomes possible, and as a result, the non-dig sewer pipe repair liner 100 impregnated with the thermosetting resin has the advantage of being able to be pulled into the sewer pipe 200 to be repaired in its original form without being locally deformed or torn. .

The present invention has been described with reference to the experimental examples shown in the drawings, but these are merely exemplary, and those skilled in the art will understand that various modifications and other equivalent experimental examples are possible therefrom. Additionally, a person skilled in the art to which the present invention pertains will understand that the present invention can be easily modified into another specific form without changing its technical idea or essential features. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive, and the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

10: first film layer
20: non-woven layer
30: second film layer
50: Sewing department
100: Liner for sewer pipe repair
110: 1st polyethylene long fiber nonwoven fabric sheet
120: 2nd polyethylene long fiber non-woven fabric sheet
200: sewer pipe

Claims (6)

delete delete A tubular sewer pipe repair liner with no coating layer on a non-woven fabric layer that can be impregnated with a thermosetting resin,
first film layer;
A non-woven fabric layer provided on the first film layer and composed of a non-woven fabric for manufacturing sewer pipe repair liners made of at least one of polypropylene fibers and polyethylene terephthalate fibers;
A sewing unit for sewing the non-woven fabric layer to form a tube shape; and
A second film layer provided on top of the non-woven fabric layer,
The nonwoven fabric for manufacturing the sewer pipe repair liner is a needle-punched nonwoven fabric or long-fiber nonwoven fabric, and is a tubular sewer pipe repair liner without a coating layer on the nonwoven fabric layer that can be impregnated with a thermosetting resin, characterized in that the basis weight is 200 to 900 g/m ² . .
In claim 3,
A tubular sewer pipe repair liner without a coating layer on a non-woven fabric layer capable of impregnating a thermosetting resin, wherein the non-woven fabric layer is provided alone or in multiple layers depending on the construction thickness of the tubular sewer pipe repair liner. .
In claim 3,
A tubular sewer pipe repair liner without a coating layer on a non-woven fabric layer impregnable with a thermosetting resin, characterized in that the first film layer and the second film layer are polyolefin-based films.
As a construction method for a trenchless sewer pipe repair liner.
i) The first step of dredging and cleaning the inside of the sewer pipe to be repaired;
ii) a second step of impregnating the liner for trenchless sewer pipe repair with a thermosetting resin and then transporting it to the site using a refrigerated vehicle;
iii) a third step of inserting the first polyethylene long fiber nonwoven fabric sheet into the inner lower part of the sewer pipe to be repaired;
iv) Repair in the third step together with a non-dig sewer pipe repair liner impregnated with a thermosetting resin through a traction process and a second polyethylene long fiber nonwoven fabric sheet provided at the lower part of the thermosetting resin-impregnated non-dig sewer pipe repair liner. A fourth step of pulling to the top of the first polyethylene long fiber nonwoven fabric sheet inserted into the inner lower part of the target's sewer pipe;
v) a fifth step of removing the first polyethylene long fiber nonwoven fabric sheet and the second polyethylene long fiber nonwoven fabric sheet;
vi) a sixth step of injecting hot water or steam into the interior of the trenchless sewer pipe repair liner impregnated with the thermosetting resin to expand the trenchless sewer pipe repair liner while curing the impregnated thermosetting resin;
vii) a seventh step of cutting the non-dig sewer pipe repair liner protruding on both sides of the sewer pipe to be repaired;
ⅷ) Step 8 of opening and finishing the sewer pipe subject to repair; and
ⅸ) Construction method of a liner for non-dig sewer pipe repair, including the 9th step of final inspection of the sewer pipe to be repaired.