Partial repair reinforcement material for water and sewage pipes and a non-excavation partial repair construction method using the same

Abstract

The present invention relates to a partial repair reinforcement material for water and sewage pipes and a non-excavation partial repair construction method using the same. The partial repair reinforcement material for water and sewage pipes comprises a resin composition for partial repair reinforcement for water and sewage pipes and a repair material comprising a polyhedral oligomer silsesquioxane compound. Since the resin composition for partial repair reinforcement for water and sewage pipes comprises a base resin, a curing agent, a curing retardant, a curing accelerator, and a polyhedral oligomer silsesquioxane compound, the partial repair reinforcement material for water and sewage pipes can have even better tensile strength, bending strength, bending modulus, and adhesion strength, and can improve the problems of delamination and reduced interfacial adhesion of conventional partial repair reinforcement materials.

Description

Technology Field

[0001] The present invention relates to a partial repair and reinforcement material for water and sewage pipes applied to a trenchless method for repairing and reinforcing the interior of aging water and sewage pipes without excavation, and a trenchless partial repair construction method using the same. Background Technology

[0002] As damage and cracks in underground pipes, such as sewer pipes, increase due to the aging of urban infrastructure, various trenchless construction methods are being actively utilized for repair and reinforcement. Among conventional trenchless pipe repair methods is the Cured-In-Place Pipe (CIPP) method, which involves lining the entire pipe with reinforcement material. This method restores the structural strength of the pipe by inserting a tube into the existing pipe and then curing a resin-impregnated body containing resin and resin-impregnated repair material inside the pipe to form a new pipe. However, since the entire section must be repaired despite localized damage, there were issues of excessive costs and long construction times.

[0003] When such damage to pipes is localized, spot repair methods are utilized, which are more economical and faster to apply in terms of cost and workability compared to full repairs. In this case, reinforcing materials using unsaturated polyester resin (UP) are mainly applied. However, unsaturated polyester resin has limitations such as relatively low tensile strength, reduced chemical resistance when exposed to the sewage environment for a long period, and insufficient adhesion to existing pipes, which makes it difficult to secure sufficient structural reinforcement effects or long-term durability even after repair.

[0004] In particular, since unsaturated polyester resins used for partial repair require superior tensile strength, chemical resistance, and adhesion strength compared to those used for total repair, the development of technology to enhance these properties is necessary. Consequently, there is a need to implement an improved trenchless partial repair method that can simultaneously ensure long-term stability and structural reinforcement even in areas of localized damage. Prior art literature

[0005] Republic of Korea Registered Patent Publication No. 10-1009289 (Registration Date: Jan. 12, 2011) Japan Registered Patent Publication No. 6460999 (Registration Date: Jan. 11, 2019)

[0006] Development of High-Strength Field-Curing Trenchless Repair Material for Sewer Pipes Using Glass Fiber and Study on Material Properties (Ji Hyun-wook, Dan Daehyun Koo, Yoo Sung-soo, Kang Jung-hee, Journal of Korean Society of Water and Wastewater Vol. 34, No. 2, April 2020) The problem to be solved

[0007] The objective of the present invention is to provide a partial repair reinforcement material for water and sewage pipes and a trenchless repair construction method using the same. More specifically, the invention aims to provide a reinforcement material capable of simultaneously ensuring excellent durability, adhesion to the inside of the pipe, and chemical resistance after hardening, and a trenchless repair construction method using the same. means of solving the problem

[0008] The present invention relates to a repair and reinforcement material for a portion of a water and sewage pipe, characterized by comprising: a resin composition for a repair and reinforcement material for a portion of a water and sewage pipe comprising a polyhedral oligomeric silsesquioxane compound; and a repair material.

[0009] The resin composition for repair and reinforcing parts of water pipes may comprise a base resin, a curing agent, a curing retardant, a curing accelerator, and a polyhedral oligomeric silsesquioxane compound.

[0010] The above base resin may be one or more selected from unsaturated polyester resin, epoxy resin, and vinyl ester resin.

[0011] The above base resin may be an unsaturated polyester resin.

[0012] The above base resin may contain a radical polymerizable monomer.

[0013] The above radical polymerizable monomer may be a styrene monomer.

[0014] The above base resin may have an acid value of 10 to 50 KOH mg / g and a viscosity of 1,000 to 3,000 mPa·s (25±1℃).

[0015] The above curing agent may be one or more selected from methyl ethyl ketone peroxide, dicumyl peroxide, benzoyl peroxide, dibenzoyl peroxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, t-butylperbenzoate, 2,5-dimethyl-2,5-di(t-butylperoxy)hexine-3, alpha,alpha-bis(t-butylperoxy)diisopropylbenzene, di-(2-tert-butylperoxyisopropyl)benzene, di-(2-tert-butylperoxyisopropyl)benzene, and derivatives thereof.

[0016] The above-mentioned curing retardant may be one or more selected from hydroquinone, toluhydroquinone, pt-butylcatechol, and pyrrolecarol.

[0017] The above-mentioned curing accelerator may be one or more selected from cobalt octylate and cobalt naphthenate.

[0018] The resin composition for repair and reinforcement of water and sewage pipes described above may further include an eco-friendly plasticizer.

[0019] The above polyhedral oligomeric silsesquioxane compound may have a silica cage structure with a size of 1 to 5 nm.

[0020] The above polyhedral oligomeric silsesquioxane compound has the molecular formula (RSiO1.5 ) n It may satisfy. (n is a natural number from 6 to 16, and R is each independently hydrogen or a straight-chain, branched, or cyclic hydrocarbon having 1 to 20 carbon atoms.)

[0021] The above polyhedral oligomeric silsesquioxane compound may have a molecular weight of 600 to 900 g / mol.

[0022] The above polyhedral oligomer silsesquioxane compound may be one or more selected from polyhedral oligomer silsesquioxane containing a methyl group and polyhedral oligomer silsesquioxane containing a vinyl group.

[0023] The polyhedral oligomer silsesquioxane compound may be included in an amount of 0.5 to 5 parts by weight per 100 parts by weight of the base resin.

[0024] The above repair material may be one or more selected from glass fibers, aramid fibers, and carbon fibers.

[0025] The present invention also comprises: A) a step of inspecting the interior of a pipeline to be repaired using a CCTV;

[0026] B) A step of cleaning the inside of the pipeline to be repaired;

[0027] C) A step of inserting a repair reinforcement material for the water and sewage pipe section into the pipe to be repaired;

[0028] D) A step of compressing and hardening a repair reinforcement material for the water and sewage pipe section inside the pipeline; and

[0029] E) Construction completion inspection phase;

[0030] The present invention relates to a non-excavation partial repair construction method characterized by including Effects of the invention

[0031] The present invention relates to a partial repair reinforcement material for water and sewage pipes and a non-excavation partial repair construction method using the same, characterized by comprising: a resin composition for partial repair reinforcement material for water and sewage pipes comprising a polyhedral oligomer silsesquioxane compound; and a repair material.

[0032] Specifically, the resin composition for partial repair reinforcement of water and sewage pipes comprises a base resin, a curing agent, a curing retardant, a curing accelerator, and a polyhedral oligomeric silsesquioxane compound, and can be manufactured by impregnating the same into a repair material to produce a partial repair reinforcement of water and sewage pipes. The reinforcement material can provide a reinforcement material capable of repairing localized damage to water and sewage pipes, and can impart long-term chemical resistance and durability to the pipeline by installing a reinforcement material with excellent tensile strength, bending strength, bending modulus, and adhesion strength to the inside of the pipe.

[0033] It provides excellent curing performance inside the pipe and, after curing, has excellent adhesion, which can reduce construction time by more than 30% compared to existing partial repairs and bring about cost savings of about 40~60% compared to full repairs.

[0034] In addition, the above-mentioned partial repair reinforcement material and the trenchless repair construction method have the advantage of being applicable not only to water and sewage systems but also to industrial piping, heating pipes, and plant piping. Specific details for implementing the invention

[0036] The following describes in detail the partial repair reinforcement material for water and sewage pipes and the non-excavation partial repair construction method using the same according to the present invention. The drawings presented below are provided as examples to ensure that the concept of the present invention is sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the drawings presented below and may be embodied in other forms, and the drawings presented below may be exaggerated to clarify the concept of the present invention. Unless otherwise defined, technical and scientific terms used herewith have the meanings commonly understood by those skilled in the art to which this invention pertains, and descriptions of known functions and configurations that could unnecessarily obscure the essence of the present invention are omitted in the following description and attached drawings.

[0037] One aspect of the present invention relates to a repair and reinforcement material for a portion of a water pipe, characterized by comprising: a resin composition for a repair and reinforcement material for a portion of a water pipe comprising a polyhedral oligomeric silsesquioxane compound; and a repair material.

[0038] The water pipe repair reinforcement material according to the present invention is characterized by being able to provide a reinforcement material with excellent tensile strength, bending strength, bending modulus, and adhesion strength by including a base resin, a curing agent, a curing retardant, a curing accelerator, and a polyhedral oligomeric silsesquioxane compound in the resin composition.

[0039] When localized damage occurs in water and sewage pipes, applying a partial repair method may be more economical than repairing the entire section. Since the partial repair method involves reinforcing only the damaged area locally, the reinforcing material must adhere sufficiently to the interface with the existing pipe and remain stable even in a sewage environment for a long period. Therefore, compared to conventional reinforcing materials for full repair, reinforcing materials for partial repair require superior tensile strength, chemical resistance, and adhesion strength to overcome problems such as delamination and reduced interfacial adhesion. The present invention includes a polyhedral oligomeric silsesquioxane compound to resolve the issues of resin delamination and reduced interfacial adhesion inherent in conventional reinforcing materials through the three-dimensional network structure of POSS and additives that form continuous hydrogen bonds. This offers the advantage of securing long-term structural integrity, which was difficult to achieve with existing technologies. Furthermore, the resin composition has a long pot life while having a short curing time, allowing for the simultaneous securing of construction flexibility and productivity. This provides a significant technical advantage in field applicability compared to existing products.

[0040] The components of a resin composition for partial repair and reinforcement of water pipes comprising a polyhedral oligomeric silsesquioxane compound according to an example of the present invention will be described in more detail below.

[0041] The resin composition for repair and reinforcing parts of water pipes described above may include a base resin, a curing agent, a curing retardant, and a polyhedral oligomeric silsesquioxane compound.

[0042] The above base resin may be one or more selected from unsaturated polyester resin, epoxy resin, and vinyl ester resin, and preferably, unsaturated polyester resin may be used.

[0043] The above-mentioned unsaturated polyester resin is a general thermosetting resin and is a resin based on an unsaturated polyester polymer. Basically, it is a resin that has high strength and wear resistance, and allows for viscosity control and curing speed control. In order to control viscosity and curing speed in this way, the above-mentioned unsaturated polyester resin may include a radical polymerizable monomer.

[0044] The above unsaturated polyester resin may be a commercially available product containing a radical polymerizable monomer, or an unsaturated polyester polymer may be synthesized directly and a product containing a radical polymerizable monomer may be used.

[0045] The above unsaturated polyester polymer can be synthesized using known methods. It comprises one or more selected from maleic anhydride, phthalic anhydride, adipic acid, propylene glycol, ethylene glycol, and diethylene glycol polymers, for example, by reacting phthalic anhydride, ethylene glycol, and maleic anhydride to synthesize the unsaturated polyester polymer. More preferably, phthalic anhydride, ethylene glycol, and maleic anhydride are mixed in a molar ratio of 1 to 2: 2 to 6: 1 to 3, respectively, and then reacted at 190 to 220°C for 16 to 22 hours to obtain an unsaturated polyester polymer having a final acid value of 10 to 50 KOH mg / g.

[0046] Accordingly, the above radical polymerizable monomer can be mixed. The above radical polymerizable monomer copolymerizes with the unsaturated bonds in the molecular backbone of the above unsaturated polyester polymer to form an unsaturated polyester resin. Specifically, the above radical polymerizable monomer may be a compound having an unsaturated carbon-carbon double bond (C=C), and more preferably, it may be a styrene monomer. The above styrene monomer can provide workability by controlling the viscosity and curing speed of the above unsaturated polyester polymer, and since it contains unsaturated double bonds, it can participate in radical reactions to improve reactivity and curing performance. Its content may be included in an amount of 30 to 33 wt% of the unsaturated polyester resin, and including it in this range results in excellent adhesion and strength of the unsaturated polyester resin.

[0047] A commercially available unsaturated polyester resin or an unsaturated polyester resin comprising the unsaturated polyester polymer and a radical polymerizable monomer may have an acid value of 10 to 50 KOH mg / g and a viscosity of 1,000 to 3,000 mPa·s (25±1℃), and preferably may have an acid value of 10 to 30 KOH mg / g, a viscosity of 2,000 to 3,000 mPa·s (25℃), and a density of 1.10 to 1.14. Within this range, the workability of the resin is improved, and the impregnation into the repair material is excellent.

[0048] The above curing agent initiates a curing (polymerization) reaction and may be one or more selected from methyl ethyl ketone peroxide, dicumyl peroxide, benzoyl peroxide, dibenzoyl peroxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, t-butylperbenzoate, 2,5-dimethyl-2,5-di(t-butylperoxy)hexine-3, alpha,alpha-bis(t-butylperoxy)diisopropylbenzene, di-(2-tert-butylperoxyisopropyl)benzene, di-(2-tert-butylperoxyisopropyl)benzene, and derivatives thereof; specifically, it is preferable to use a mixture of methyl ethyl ketone peroxide and benzoyl peroxide in a weight ratio of 1:1. When the base resin of the resin composition is an unsaturated polyester resin, the amount of the above-mentioned curing agent added is preferably 0.5 to 5 parts by weight per 100 parts by weight of the unsaturated polyester resin.

[0049] The above-mentioned curing retardant is intended to prevent the natural radical polymerization reaction between the double bonds of the styrene monomer and the unsaturated polyester polymer, thereby slowing down the initial rate of the radical reaction to prevent the resin from curing immediately, and to provide a pot life of a certain amount to the composition and maintain storage stability by preventing unnecessary curing during storage. One or more selected from hydroquinone, toluhydroquinone, pt-butylcatechol, and pyrrolecarol may be used, and most preferably, hydroquinone and toluhydroquinone may be mixed in a weight ratio of 1:1 to 1.2. When the base resin of the resin composition is an unsaturated polyester resin, the amount of the above-mentioned curing retardant added is preferably 0.03 to 0.08 parts by weight per 100 parts by weight of the unsaturated polyester resin.

[0050] The above curing accelerator may be one or more selected from cobalt octylate and cobalt naphthenate, and by adding the curing accelerator, rapid curing properties can be further improved when curing begins. When adding the curing accelerator, cobalt octylate and cobalt naphthenate may be mixed in a 1:1 weight ratio and used, and the amount added is preferably 0.1 to 1.0 parts by weight per 100 parts by weight of unsaturated polyester resin when the base resin of the resin composition is an unsaturated polyester resin.

[0051] The above polyhedral oligomeric silsesquioxane (POSS) compound is a compound represented by the following chemical formula 1, with the molecular formula (RSiO 1.5 ) n It is a silica cage structure with a size of 1 to 5 nm, represented by, where n can be a natural number from 6 to 16. It is an organic-inorganic intermediate or hybrid compound that possesses both the properties of inorganic silica (SiO2) and organic silicon (R2SiO), and such a silica cage molecular structure can enhance the stiffness and flexibility of a polymer resin and provide thermal stability and additional adhesion.

[0052] [Chemical Formula 1]

[0053]

[0054] The above polyhedral oligomeric silsesquioxane compound is not particularly limited in the number of Si atoms within its structure, and the above molecular formula (RSiO 1.5 ) n Depending on the number of n, it may contain 6 to 16 Si atoms.

[0055] In the above chemical formula 1, R may each independently be hydrogen or a straight-chain, branched, or cyclic hydrocarbon having 1 to 20 carbon atoms.

[0056] The polyhedral oligomeric silsesquioxane compound may have a molecular weight of 600 to 900 g / mol. Such a polyhedral oligomeric silsesquioxane compound can be uniformly blended even in small amounts and can provide high thermal stability and excellent chemical resistance. Furthermore, it can improve mechanical properties such as tensile strength and adhesion strength of the composition and, furthermore, the reinforcing material, and due to structural stability, the bending characteristics of the reinforcing material are also improved.

[0057] The polyhedral oligomer silsesquioxane compound may be one or more selected from polyhedral oligomer silsesquioxane containing a methyl group and polyhedral oligomer silsesquioxane containing a vinyl group. The polyhedral oligomer silsesquioxane containing a methyl group may be substituted with at least one of the R groups having a methyl group as the terminal functional group, and the polyhedral oligomer silsesquioxane containing a vinyl group may be substituted with at least one of the R groups having a vinyl group as the terminal functional group.

[0058] More preferably, the polyhedral oligomer silsesquioxane compound may be a polyhedral oligomer silsesquioxane containing vinyl groups, specifically poly(vinylsilsesquioxane). The polyhedral oligomer silsesquioxane containing vinyl groups contains unsaturated double bonds, so when applied to unsaturated polyester resin, it exhibits excellent intermolecular interactions and good miscibility. Furthermore, as curing can be accelerated due to radical reactions of the double bonds, problems such as curing failure or incomplete curing can be minimized, and workability can be improved. In addition, as the curing density increases, the adhesion of the composition to repair materials such as glass fibers can be improved, and consequently, a reinforcing material can be provided with improved mechanical properties such as excellent tensile strength, bending strength, and bending modulus, and with maximized adhesion strength characteristics with the inner wall of the pipe.

[0059] The above polyhedral oligomer silsesquioxane compound may be included in an amount of 0.5 to 5 parts by weight per 100 parts by weight of unsaturated polyester resin when the base resin of the resin composition is an unsaturated polyester resin. If the amount is less than 0.5 parts by weight, it becomes difficult to secure hardness and adhesion, and if the amount is greater than 5 parts by weight, it may be difficult to impart bending characteristics such as insignificant adhesion performance or cracking.

[0060] The resin composition for repair and reinforcement of water and sewage pipes described above is characterized by further including an eco-friendly plasticizer.

[0061] The above-mentioned eco-friendly plasticizer may include at least one of citric acid esters (e.g., acetyl tributyl citrate (ATBC), triethyl citrate (TEC)), epoxidized vegetable oils (e.g., epoxidized soybean oil (ESO), epoxidized linseed oil) and polysebacate-based polymer plasticizers.

[0062] When the above base resin is an epoxy resin, it is preferable to use epoxidized soybean oil (ESO) and acetyl tributyl citrate (ATBC) together. The epoxy groups within the ESO molecule partially bind to the resin's curing reaction system, thereby controlling crosslinking density, relieving internal stress, and improving heat resistance and chemical resistance. Meanwhile, ATBC is a low-volatility, low-toxicity plasticizer that improves the flexibility and workability of the resin and can enhance tensile strength and tear resistance after curing.

[0063] Therefore, when ESO and ATBC are used in combination, viscosity reduction and curing stability are simultaneously ensured, and a synergistic effect is observed in which the impact strength, adhesion, weather resistance, and chemical resistance of the resin after curing are significantly improved.

[0064] When the above base resin is an unsaturated polyester resin, ATBC or TEC can be used alone or in combination with a polysebacate-based polymer plasticizer, and by using ATBC and the polysebacate-based polymer plasticizer in a weight ratio of 1:1, processability and long-term durability can be improved simultaneously.

[0065] The content of the above-mentioned eco-friendly plasticizer is preferably 2 to 12 parts by weight based on 100 parts by weight of the base resin, and the balance of resin viscosity and physical properties is best in the range of 5 to 10 parts by weight.

[0066] This resin composition is impregnated and laminated into the inner wall of the pipe in a trenchless manner to form an integrated liner that adheres to the inner surface upon curing, thereby improving the pressure resistance and watertightness of existing pipes while minimizing the generation of environmentally harmful substances.

[0067] The resin composition for repairing and reinforcing parts of water and sewage pipes may further include additives depending on the purpose, in addition to the aforementioned components. As the additives, one or more selected from eco-friendly curing aids, polymer reinforcing agents, solvent-free viscosity modifiers, UV stabilizers, and flame retardant aids may be added.

[0068] The above-mentioned eco-friendly curing aid may be one or more selected from citric acid and maleic anhydride, and its content may be 0.01 to 0.2 parts by weight per 100 parts by weight of unsaturated polyester resin when the base resin is an unsaturated polyester resin.

[0069] The above polymer reinforcing agent may be one or more selected from nanocellulose, high-performance silane, polyimide microparticles, graphene oxide, and ceramic nanoparticles, and the content thereof may be 0.1 to 3 parts by weight per 100 parts by weight of unsaturated polyester resin when the base resin is unsaturated polyester resin.

[0070] The above solvent-free viscosity modifier may be one or more selected from polyamide wax and urethane oligomer, the above UV stabilizer may be a hindered amine light stabilizer (HALS), and the above flame retardant adjuvant may be diethyl phosphite, and the above additives are not limited thereto as long as they are components and amounts commonly used in the industry.

[0071] As described above, the water pipe repair reinforcement material of the present invention can be manufactured by impregnating a repair material with a resin composition for water pipe repair reinforcement material comprising the polyhedral oligomer silsesquioxane compound.

[0072] The above repair material has appropriate flexibility and strength to be fitted according to the shape of the inner wall of the pipe, and has gaps into which a resin composition can be impregnated; it may be one or more types selected from glass fiber, aramid fiber, and carbon fiber. For use in the partial repair reinforcement material of the water and sewage pipe according to the present invention, glass fiber with a thickness of 0.5 to 1.2 mm and a weight of 900 to 1,000 g / cm² may be used. Furthermore, it is more preferable to use glass fiber having the physical properties of E-Glass type according to KS L 2315 and a density of 6.1 ± 1 count / inch according to KS L 2513.

[0073] Another aspect of the present invention relates to a non-excavation partial repair construction method using a partial repair reinforcement for water and sewage pipes, characterized by comprising: A) a step of inspecting the inside of a pipe to be repaired using CCTV; B) a step of cleaning the inside of a pipe to be repaired; C) a step of inserting a partial repair reinforcement for water and sewage pipes into the pipe to be repaired; D) a step of compressing and curing the partial repair reinforcement for water and sewage pipes into the pipe; and E) a construction completion inspection step.

[0074] Step A) above is a step of inspecting the inside of the pipe to be repaired using CCTV, Step B) is a step of cleaning the inside of the pipe to be repaired, and Step C) above is a step of inserting a partial repair reinforcement material for water and sewage pipes into the pipe to be repaired. First, the partial repair reinforcement material for water and sewage pipes can be manufactured by impregnating a repair material with a resin composition for partial repair reinforcement materials for water and sewage pipes containing a polyhedral oligomer silsesquioxane compound. The reinforcement material is prepared by impregnating the entire front and rear surfaces of the repair material with both ends unfolded with the resin composition. At this time, the amount of the repair material used can be as shown in Table 1 below, depending on the pipe diameter and based on a repair location width of 400 mm.

[0075] Pipe diameter (mm) 150 200 250 300 400 500 600 700 800 900 1,000 1,200 1,500 fiberglass Width (mm) 400 400 400 400 400 400 400 400 400 400 400 400 400 Length (mm) 500 660 820 990 1320 1650 1980 2310 2640 2970 3300 3940 4900 Double count (length) 2 2 2 3 3 3 3 3 4 4 4 4 4 Area (㎡) 0.40 0.53 0.66 1.19 1.58 1.98 2.38 2.77 4.22 4.75 5.28 6.34 7.93 Usage (kg) 0.39 0.51 0.63 1.14 1.52 1.90 2.28 2.66 4.06 4.56 5.07 6.08 7.60

[0077] The amount of the above resin composition used can be as shown in Table 2 below, depending on the pipe diameter based on a repair location width of 400 mm.

[0078] Pipe diameter (mm) 150 200 250 300 400 500 600 700 800 900 1,000 1,200 1,500 Usage (kg) 0.25 0.50 0.75 1.00 2.25 3.50 4.25 5.00 7.00 7.75 8.50 10.00 12.25

[0080] Both ends of the partially repair reinforcement manufactured above are folded inward at a single point of seam, and then wrapped around and secured to the partially repair device. The partially repair device includes an expansion tube capable of expanding by air injection, such as steam heat, and the reinforcement can be wrapped around and positioned on the outer shell of the partially repair device to which the expansion tube is attached. When inserting the partially repair device, which has the partially repair reinforcement fixed to the sewer pipe, into the pipe to be repaired, a semicircular traction device can be installed in front of the partially repair device and then moved to the repair location inside the pipe. At this time, to prevent the reinforcement from becoming loose or slipping due to getting caught on sediment, steps, protrusions, or perforations in the sewer pipe caused by the center of gravity during the process of moving the reinforcement to the repair location, the front part of the repair device is raised to the center inside the pipe by traction force, thereby ensuring that the reinforcement does not get caught on the bottom surface or steps during movement.

[0081] D) is a step of compressing and hardening a repair reinforcement material for the water and sewage pipe section inside the pipe, and is a step of supplying steam heat to the inside of the repair device packer by generating steam heat of 90~120℃ through a heating device and a mist nozzle spraying device using a steam heat supply device, and is a step of performing repair by hardening the reinforcement material by maintaining it in a compressed state on the damaged part for a certain period of time in this way.

[0082] E) The construction completion inspection stage can be completed by, after the curing process is finished in the partial repair device, releasing the air from the partial repair device out of the pipeline to remove the air pressure and separating it from the reinforcing material, then lifting and withdrawing the partial repair device, and finally inspecting whether the repair area has been completed.

[0084] Hereinafter, the partial repair reinforcement material for water and sewage pipes according to the present invention and the trenchless repair construction method using the same will be explained in more detail through examples. However, the following examples are merely references for explaining the present invention in detail, and the present invention is not limited thereto and can be implemented in various forms.

[0085] Furthermore, unless otherwise defined, all technical and scientific terms have the same meaning as generally understood by one of the art to which the present invention pertains. The terms used in the description herein are merely for the purpose of effectively describing specific embodiments and are not intended to limit the present invention.

[0087] <Repair Material Test Results>

[0088] Glass fiber was tested as a repair material according to the items in Table 3 below, and the results are presented.

[0089] (Test Items) unit Standard value Result Related standards Woven Roving Colth Fiber Specifications (Glass Type) - E-GLASS E-GLASS KS L 2315 group - Plain Plain KS L 2508 Yarn specifications slope - ER 1200 ER 1200 KS L 2313 Wisa - ER 1200 ER 1200 KS L 2313 density slope count / inch 6.1±1 6.1 KS L 2513 Wisa count / inch 6.1±1 6.1 KS L 2513 Chopped Strand Mat Loss on ignition % Max 10.0 3.7 KS L 2513 Fab Mat weight g / ㎠ 960±96 960 KS L 2513 width ㎜ 1040±15 1040 KS L 2513

[0091] <Manufacture of Resin Composition for Partial Repair and Reinforcement of Water and Sewer Pipes>

[0092] Example 1:0.02 g of hydroquinone and 0.02 g of toluhydroquinone were mixed and added to 100 g of unsaturated polyester resin (acid value 10~30 KOH mg / g, viscosity 2,000~3,000 mPa·s (25℃) and density 1.10~1.14). Accordingly, 0.5 g of methyl ethyl ketone peroxide, 0.5 g of benzoyl peroxide, 0.25 g of cobalt octylate, 0.25 g of cobalt naphthenate, 2 g of poly(vinylsilsesquioxane) (molecular weight 633.04 g / mol), 3 g of polyimide microparticles, 0.1 g of citric acid, 0.5 g of urethane oligomer, 1 g of bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate, and 5 g of an eco-friendly plasticizer mixed with acetyl tributyl citrate and a polysebacate-based polymer plasticizer in a weight ratio of 1:1 were added and stirred to prepare a resin composition for repair and reinforcement of water and sewage pipes.

[0093] Example 2: A resin composition was prepared using the same process as in Example 1 above, except that poly(methylsilsesquioxane) (Poly(methylsilsesquioxane, molecular weight 700-800 g / mol) was added instead of poly(vinylsilsesquioxane).

[0094] Comparative Example 1: A resin composition was prepared using the same process as in Example 1 above, except that poly(vinylsilsesquioxane) was not added.

[0096] <Characteristic Evaluation Method>

[0097] A partial repair and reinforcement material for water pipes was manufactured by impregnating the above glass fibers with the resin compositions of Example 1, Example 2, and Comparative Example 1, and the characteristics were evaluated using the test items in Table 4 below, and the results are shown.

[0098] Test items unit Test standards Standard value Example 1 Example 2 Comparative Example 1 tensile strength N / ㎟ KS M 3015:2003 96 or more 165 156 114 Bending strength N / ㎟ KS M 3015:2003 30 or more 255 202 95 Bending modulus N / ㎟ KS M 3015:2003 3,000 or more 11.3×10 3 10.1×10 3 5.6×10 3 Chemical resistance (5% sulfuric acid, (23±2)℃, 5h) - Percentage change in mass % KS M ISO 175 :2010 - 0.31 0.4 0.6 Adhesion strength MPa KS F 4936:2018 1.0 or higher 1.7 1.4 1.1

[0100] Referring to Tables 3 and 4 above, compared to Comparative Example 1, which does not contain a polyhedral oligomeric silsesquioxane compound, the reinforcing material of Example 2, which contains poly(methylsilsesquioxane) as the polyhedral oligomeric silsesquioxane compound, has a tensile strength of 156 N / mm², a flexural strength of 202 N / mm², and a flexural modulus of 10.1×10⁻⁶. 3 It exhibited excellent physical properties with a tensile strength of N / mm², a mass change rate of 0.4% after immersion in sulfuric acid test solution, and an adhesion strength of 1.4 MPa. In particular, the reinforcing material of Example 1, comprising poly(vinylsilsesquioxane) as a polyhedral oligomeric silsesquioxane compound, showed a tensile strength of 165 N / mm², a flexural strength of 255 N / mm², and a flexural modulus of 11.3×10⁻⁶ according to KS M 3015:2003. 3 It was found to be excellent with an adhesion strength of 1.7 MPa according to N / mm² and KS F 4936:2018, and showed excellent chemical resistance with a mass change rate of 0.31% after immersion in sulfuric acid test solution.

[0101] From this, it was confirmed that the water and sewage pipe partial repair reinforcement material of the present invention can provide a water and sewage pipe partial repair reinforcement material having excellent tensile strength, bending strength, bending modulus, chemical resistance, and adhesion strength by including, in a resin composition for water and sewage pipe partial repair reinforcement material, 0.5 to 5 parts by weight of a curing agent, 0.03 to 0.08 parts by weight of a curing retardant, 0.1 to 1.0 parts by weight of a curing accelerator, and 0.5 to 5 parts by weight of a polyhedral oligomeric silsesquioxane compound, relative to 100 parts by weight of unsaturated polyester resin.

[0102] Although the present invention has been described above through specific details and limited embodiments, this is provided merely to aid in a more comprehensive understanding of the invention, and the invention is not limited to the above embodiments. Those skilled in the art can make various modifications and variations from this description.

[0103] Accordingly, the scope of the present invention is not limited to the described embodiments, and all things equivalent to or having equivalent variations to the claims set forth below, as well as the claims set forth below, shall be considered to fall within the scope of the concept of the present invention.

Claims

Claim 1 A resin composition for partial repair and reinforcement of water and sewage pipes comprising a polyhedral oligomeric silsesquioxane compound; and a repair material; wherein the resin composition for the repair and reinforcement of water and sewage pipe parts comprises, as a base resin, 30 to 33 wt% of styrene monomer in an unsaturated polyester resin, and, per 100 parts by weight of the unsaturated polyester resin, 0.5 to 5 parts by weight of polyhedral oligomeric silsesquioxane containing vinyl groups, 0.5 to 5 parts by weight of a curing agent, 0.03 to 0.08 parts by weight of a curing retardant, and 0.1 to 1.0 parts by weight of a curing accelerator, wherein the curing agent comprises methyl ethyl ketone peroxide, dicumyl peroxide, benzoyl peroxide, dibenzoyl peroxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, t-butylperbenzoate, 2,5-dimethyl-2,5-di(t-butylperoxy)hexine-3, A partial repair and reinforcement material for water and sewage pipes, characterized by being one or more selected from alpha, alpha-bis(t-butylperoxy)diisopropylbenzene, di-(2-tert-butylperoxyisopropyl)benzene, di-(2-tert-butylperoxyisopropyl)benzene and derivatives thereof, wherein the curing retardant is one or more selected from hydroquinone, toluhydroquinone, pt-butylcatechol, and pyrrolecarol, and the curing accelerator is one or more selected from cobalt octylate and cobalt naphthenate. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 delete Claim 7 A water pipe partial repair reinforcing material according to claim 1, characterized in that the base resin has an acid value of 10 to 50 KOH mg / g and a viscosity of 1,000 to 3,000 mPa.s (25±1℃). Claim 8 delete Claim 9 delete Claim 10 delete Claim 11 In claim 1, the resin composition for the water and sewage pipe repair and reinforcement material is characterized by further including an eco-friendly plasticizer. Claim 12 A water pipe partial repair reinforcement material according to claim 1, wherein the polyhedral oligomer silsesquioxane compound is characterized by having a silica cage structure with a size of 1 to 5 nm. Claim 13 In claim 1, the polyhedral oligomeric silsesquioxane compound is of the molecular formula (RSiO 1.5 ) n A partial repair and reinforcing material for water and sewage pipes characterized by satisfying [the following]. (n is a natural number from 6 to 16, and R is each independently hydrogen or a straight-chain, branched, or cyclic hydrocarbon having 1 to 20 carbon atoms.) Claim 14 A water pipe partial repair reinforcing material according to claim 1, characterized in that the polyhedral oligomeric silsesquioxane compound has a molecular weight of 600 to 900 g / mol. Claim 15 delete Claim 16 delete Claim 17 A water pipe partial repair and reinforcement material according to claim 1, characterized in that the repair material is one or more types selected from glass fiber, aramid fiber, and carbon fiber. Claim 18 A) a step of inspecting the inside of the pipe to be repaired using CCTV; B) a step of cleaning the inside of the pipe to be repaired; C) a step of inserting a water and sewage pipe partial repair reinforcement material according to any one of claims 1, 7, 11 to 14, and 17 into the pipe to be repaired; D) a step of compressing and hardening the water and sewage pipe partial repair reinforcement material into the pipe; and E) a construction completion inspection step; characterized by comprising a non-excavation partial repair construction method.

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