KR102143971B1 - Eco-friendly mortar for pipeline repair and reinforcement and pipeline repair and reinforcement complex, pipeline repair and repair method using the same - Google Patents

Abstract

The present invention relates to eco-friendly mortar for repairing and reinforcing a pipeline, which excludes Portland cement to increase binding force with a reinforcement material and strength while maximizing generation of hexavalent chrome (Cr^6+), which is a harmful material, and a pipeline repairing/reinforcement method using the same. According to the present invention, the eco-friendly mortar for repairing and reinforcing a pipeline comprises: 49-55 wt% of blast furnace slag cement, 0.05-0.2 wt% of twisted PE fiber, 0.2-1.5 wt% of polymer, 0.02-0.1 wt% of a thickener, 0.05-0.2 wt% of a defoamer, and 40-50 wt% of fine aggregate. To increase coupling properties and tensile strength, the twisted PE fiber is added in a shape in which twisted PE short fiber having a length of 3-6 cm and having both end parts bent in a ring shape are uniformly dispersed.

Description

ECO-FRIENDLY MORTAR FOR PIPELINE REPAIR AND REINFORCEMENT AND PIPELINE REPAIR AND REINFORCEMENT COMPLEX, PIPELINE REPAIR AND REPAIR METHOD USING THE SAME}

The present invention relates to @, and in particular, an eco-friendly mortar for repairing and reinforcing pipelines that minimizes the generation of hexavalent chromium (Cr ⁶⁺ ), a harmful substance, by excluding Portland cement, and improves the bonding strength and strength with the reinforcing material, and It relates to a pipe repair and reinforcement method using this.

Cement is a bonding material used as a building material, and mankind has been using it for thousands of years. The cement used in pyramids is a mixture of lime and gypsum, and in Roman times, lime and volcanic ash are mixed. These cements were used until around the 18th century as pre-hardened cements, and hydraulic cements came out around 1756~1759, after which a mixture of limestone and clay was baked to make cement. It was named Portland Cement because its shape and color were similar to the natural stone of Portland Island.

Portland cement is commonly referred to as cement today. Portland cement is powdered by sufficiently mixing raw materials containing lime, silica, alumina, and iron oxide as the main components in an appropriate ratio, melting a part of it, and adding an appropriate amount of gypsum to a fired clinker. Portland cement is mainly clinker obtained by mixing calcareous raw materials and clay raw materials in an appropriate ratio (silicate raw materials and iron oxide raw materials are sometimes added to control the composition), pulverized and calcined until some of them melt (about 1,450℃). It is made by finely pulverizing by adding a little gypsum as a setting control agent.

When Portland cement is kneaded with water, it loses its fluidity and hardens after some time. This process is called setting, and the process of gaining strength after that is called hardening. Among the constituent compounds of cement, trilime silicate is quick to hydrate and has good strength, contributing to early strength. Dilime silicate slows the rate of hydration and increases its strength over the long term. Trilime aluminate has a faster hydration rate than other constituent compounds, so it reacts rapidly with water and hardens. At this time, if there is gypsum, the setting time is controlled by reaction with gypsum. The constituent compounds of cement generate heat of hydration during hydration. In the heat of hydration, aluminate trilime is the largest, followed by silicate trilime. Therefore, a large amount of silicate trilime is required for crude steel cement that requires early strength, and the amount of aluminate trilime or tricalcium silicate is limited for cement used in large structures such as dams.

Blast furnace slag cement, silica cement, fly ash cement, alumina cement, and the like are used as mixed cements that express new properties by mixing other components with the Portland cement.

Among them, blast furnace slag cement is a cement using blast furnace slag (blast furnace water) produced by blast furnaces of steel mills, has chemical resistance, and has excellent long-term strength rather than short-term, so it is mainly used for civil works such as wastewater, ports, and rivers. . Blast furnace slag cement is manufactured by mixing and pulverizing Portland cement (or clinker), gypsum, and blast furnace slag, and the blast furnace slag cement prepared in this way has a disadvantage of slow hardening and weak initial strength compared to ordinary cement.

Accordingly, a blast furnace slag cement that contains a large amount of blast furnace slag and has quick hardening and excellent initial strength has been disclosed through Patent Registration No. 10-0702471 (2007.03.27). However, this patented technology has a problem in that a large amount of hexavalent chromium (Cr ⁶⁺ ), which is a harmful substance, is detected because Portland cement is contained in a high specific gravity. In the case of hexavalent chromium, it is an artificial substance that is not natural, but it is an artificial substance that has been prescribed as a carcinogen for a long time in Japan and Denmark, and is a substance that has been raised as a cause of atopy in Korea.

Furthermore, it was necessary to improve structural strength including tensile strength.

Korean Registered Patent Publication No. 10-0702471 (2007.03.27)

Accordingly, the present invention has been proposed to solve the problems of the prior art, and the object of the present invention is to minimize the generation of hexavalent chromium (Cr ⁶⁺ ), a harmful substance, by excluding Portland cement, and It is to provide an eco-friendly mortar for repairing and reinforcing pipes to improve strength, and a pipe repair and reinforcement method using the same.

In order to achieve the above object, the eco-friendly mortar for pipe repair and reinforcement according to the technical idea of the present invention is an eco-friendly mortar for pipe repair and reinforcement for use in the pipe repair and reinforcement method for repairing and reinforcing old or damaged pipes. , Blast furnace slag cement 49-55% weight, PE blended 0.05-0.2% weight, polymer 0.2-1.5% weight, thickener 0.02-0.1% weight, foaming agent 0.05-0.2% weight, and fine aggregate 40-50% weight, wherein In order to increase bondability and tensile strength, the PE braid is characterized by its technical construction that both ends are provided in a 3 to 6 cm long short fiber PE braided yarn that is bent in a ring shape and added in a uniformly dispersed form.

Here, the short-fiber PE plying yarn, in which both ends are bent in a ring shape, is manufactured by applying a tensile force to the PE plying string, and in that state, cutting the PE plying string into several short strands.

In addition, the short fiber PE plying yarn may be characterized in that it is provided by mixing two types of a first short fiber PE plying yarn of 3 to 4 cm in length and a second short fiber PE plying yarn of 5 to 6 cm in length.

In addition, it may be characterized in that an epoxy layer formed by coating an epoxy on the surface of the short fiber PE plywood, and a plurality of inorganic particle protrusions are formed on the epoxy layer to improve surface adhesion and flame retardancy.

In addition, the inorganic particles may be characterized in that the aluminosilicate particles having a particle diameter of 10 ~ 100μm.

In addition, the blast furnace slag cement contains blast furnace slag as the largest component by weight, and ethrinzite (3CaO·Al2O ₃ ·3CaSO ₄ ·32H ₂ O) is produced through a hydration reaction. , Further comprising anhydrous gypsum, and the production of ethrinzite through the hydration reaction of the auin, lime, and anhydrite is 3CaO·4Al ₂ O ₃ ·SO ₃ + 6CaO + 8CaSO ₄ + 32H ₂ O --> It can be characterized according to 3CaO·Al ₂ O ₃ ·3CaSO ₄ ·32H ₂ O.

In addition, blast furnace slag 50-70% by weight, gypsum 5-15% by weight, Auin 6-20% by weight, water reducing agent or superplasticizer 0.3-2.5% by weight, and the balance of Portland cement, the auin is CaO Contains limestone as a component, bauxite as an Al2O3 component, or inorganic material with an Al2O3 component, and includes gypsum as an SO3 component, Cm (lime saturation ratio = C-0.7(F+T+S')/1.87 S+0.55A) is 0.60 or more, and A/S' (aluminum water sulfuric acid ratio) is in the range of 2.0 to 4.5. It may be characterized in that it is prepared by firing at a temperature of 1,350°C. (Here, C: CaO% weight, F: Fe2O3% weight, T: TiO2% weight, S': SO3% weight, S: SiO2% weight, A: Al2O3% weight)

On the other hand, the conduit repair/reinforcement composite according to the present invention is applied to a conduit repair/reinforcement method for repairing and reinforcing old or damaged conduit, and includes a primer layer formed by applying a primer to a cleaned and surface-treated inner wall of a conduit; A mortar layer formed by applying the eco-friendly mortar of any one of claims 1 to 7 to the primer layer; Expanded metal is buried inside the mortar layer while surrounding the inner wall of the pipe to support the mortar layer; A set anchor fixed to the inner wall of the pipe at regular intervals to first support the expanded metal and embedded in the mortar layer; A spider member fixed to the bolt head of the set anchor and embedded in the mortar layer in a state in which the expanded metal is secondarily supported so as not to be excessively lifted or moved from the inner wall of the pipe; It includes a finishing material layer applied to the mortar layer,

In addition, the spider member is composed of an anchor cap that is forcibly fitted by a blow corresponding to the bolt head of the set anchor, and a plurality of support rods extending radially elongated around the anchor cap, and before applying the mortar, the set anchor is In a state in which the anchor cap is fixed to the bolt head, the expanded metal can be supported by the support rod so as not to be excessively lifted or moved from the inner wall of the pipe.

In addition, the end of the support rod of the spider member may be formed in a shape bent toward the inner wall of the pipe, so that the thickness of the mortar layer is uniformly formed based on the length of the bent end of the support rod.

In addition, it may be characterized in that a plurality of protrusions are formed in a form in which an annular ring is inserted at a distance from the support rod of the spider member to increase the bonding strength with the mortar.

On the other hand, the pipe repair and reinforcement method according to the present invention comprises the steps of cleaning and surface treatment of the inner wall of the pipe; Forming a primer layer by applying a primer to the inner wall of the pipe; Constructing expanded metal in a shape surrounding the inner wall of the pipe; Perforating the inner wall of the pipe to form perforated holes at regular intervals, and then hitting the set anchor to install; Installing the spider member; Forming a mortar layer by applying the eco-friendly mortar of any one of claims 1 to 7 to the inner wall of the pipe; Curing the mortar applied to the inner wall of the pipe; And forming a finishing material layer by applying a finishing material so that deterioration or corrosion does not occur on the mortar cured on the inner wall of the pipe, wherein the spider member is an anchor cap that is forcibly fitted by a blow corresponding to the bolt head of the set anchor. And, consisting of a plurality of support rods extending radially with respect to the anchor cap, in the step of installing the spider member, the anchor cap of the spider member is fixed by hitting the bolt head of the set anchor, and then the support rod of the spider member is used. Thus, it may be characterized in that the expanded metal is supported so as not to be excessively lifted or moved from the inner wall of the pipe.

The eco-friendly mortar for pipe repair and reinforcement according to the present invention and pipe repair and reinforcement composite and pipe repair and reinforcement method using the same minimize the generation of hexavalent chromium (Cr ⁶⁺ ), a harmful substance, by excluding Portland cement, and short fiber This is a unique method of cutting into multiple strands while the tensile force is applied to the PE plying string, and by dispersing the short-fiber PE plying yarns made in a ring shape at both ends, it contributes to the integrated internal structure of the entire repair and reinforcement composite, resulting in high tensile strength. Can be expected to improve

In addition, the present invention minimizes the use of a set anchor for supporting the reinforcement by using a spider member, thereby preventing excessive damage to the inner wall of the pipe, reducing the work process, and improving workability, and the strength and adhesion of the mortar You can strengthen it more.

1 is a cross-sectional view for explaining the configuration of an eco-friendly mortar for pipe repair and reinforcement used in a pipe repair and reinforcement method according to an embodiment of the present invention
2 and 3A to 3D are a series of reference diagrams for explaining the manufacturing process of short fiber PE plying in an eco-friendly mortar for pipe repair and reinforcement used in the pipe repair and reinforcement method according to an embodiment of the present invention.
4 is a cross-sectional view of a repaired/reinforced pipe for explaining a repair/reinforcement composite constructed by a pipe repair/reinforcement method according to an embodiment of the present invention;
FIG. 5 is a reference diagram showing a reinforcing structure centered on a spider member among the repair/reinforcement composite viewed in the direction "A" of FIG. 1
6 is a perspective view of a spider member used in a pipe repair and reinforcement method according to an embodiment of the present invention.
7 is a cross-sectional view showing a state in which a spider member used in a pipe repair and reinforcement method according to an embodiment of the present invention is fitted and fixed to the bolt head of a set anchor.
8 is a flow chart for explaining the pipe repair and reinforcement method according to an embodiment of the present invention
9A to 9E are a series of reference diagrams for explaining detailed steps of a pipe repair/reinforcement method according to an embodiment of the present invention.

With reference to the accompanying drawings, an eco-friendly mortar for pipe repair and reinforcement according to embodiments of the present invention, a pipe repair and reinforcement composite using the same, and a pipe repair and reinforcement method will be described in detail. Since the present invention can apply various changes and have various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific form of disclosure, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention. In describing each drawing, similar reference numerals have been used for similar elements. In the accompanying drawings, dimensions of structures are shown to be enlarged than actual for clarity of the present invention, or reduced than actual to understand a schematic configuration.

In addition, terms such as first and second may be used to describe various elements, but the elements should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component. On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

<Example>

1 is a cross-sectional view for explaining the configuration of an eco-friendly mortar for pipe repair and reinforcement used in the pipe repair and reinforcement method according to an embodiment of the present invention, and FIGS. 2 and 3A to 3D are according to an embodiment of the present invention. This is a series of reference diagrams to explain the manufacturing process of short fiber PE plying in an eco-friendly mortar for pipe repair and reinforcement used in pipe repair and reinforcement method.

On the other hand, the mortar for pipe repair and reinforcement according to the embodiment of the present invention, the mortar used in the pipe repair and reinforcement method to be described later, is to increase the bonding and tensile strength with the spider member 110 and the expanded metal 130 As a developed eco-friendly mortar for repairing and reinforcing pipes, it is made in a technical feature that short fiber PE plying yarns (151,152) having a length of 3 to 6 cm with both ends bent in a ring shape are added in a uniformly dispersed form.

The mortar for pipe repair and reinforcement according to an embodiment of the present invention is blast furnace slag cement 49-55% by weight, PE laminated 0.05-0.2% by weight, polymer 0.2-1.5% by weight, thickener 0.02-0.1% by weight, foaming agent 0.05-0.2 Includes 40-50% by weight and fine aggregate, and the PE ply is provided with short fiber PE ply (151,152) of 3 to 6 cm in length with both ends bent in a ring shape in order to increase bondability and tensile strength as shown in FIG. And added in a uniformly dispersed form.

Here, the single-fiber PE ply yarns (151, 152) with both ends bent in a ring shape apply a tensile force to the high elastic PE ply yarns (15) used as fishing lines in the market, and in that state, the PE ply yarns (15) are multiplied. It is produced by a unique process that cuts it shortly.

To this end, as shown in Fig. 2, several rows of PE plying strings 15 are simultaneously stretched by the holder W1, and in that state, several blades W4a are formed at intervals of 3 to 6 cm as shown in Figs. 3c and 3d. It is cut with an excitation bite (W4). At this time, while applying a tensile force before cutting the PE braided string 15, while moving the spray nozzle (W2) as shown in Fig. 9a, spraying and applying epoxy, and before the applied epoxy is cured, 10 to 100 μm as shown in Fig. 9b A process of forming a protrusion 153b by inorganic particles on the surface of the PE braided string 15 by spraying aluminosilicate having a particle diameter of the size with a spray (W3) is additionally performed in the middle.

Accordingly, as shown in FIG. 1, an epoxy layer 153a formed by applying an epoxy, which is a material that improves bonding properties with other components, in particular, other components of the mortar, on the surfaces of the short-fiber PE ply yarns 151 and 152, and the epoxy layer Single fiber PE plying yarns 151 and 152 of a unique shape in which a plurality of inorganic particle protrusions 153b are formed in 153a to improve surface adhesion and flame retardancy are completed. When such a unique single-fiber PE plying yarn (151,152) is included in the mortar, a number of single-fiber PE plying yarns (151,152) are entangled with each other by both ends bent in a ring shape, and furthermore, the single fiber PE plying yarns (151,152) are As the spider member 110 and the expanded metal 130 are also stretched, it contributes to having an integrated internal structure of the repair/reinforcement composite 100 as a whole. In this way, by the structural characteristics centering on the single-fiber PE plywood (151, 152), as well as the mortar itself, the overall bondability and tensile strength of the repair/reinforcement composite 100 are improved.

Here, in the case of the single-fiber PE plying yarns 151 and 152, it is preferable not to provide a single length, but to provide two types of short and long relative lengths. While the length of the short fiber PE ply (151, 152) does not exceed the range of 3 to 6 cm, one type is the first short fiber PE ply yarn 151 having a length of 3 to 4 cm, and the other type has a length of 5 to 6 cm. It is provided with a second short fiber PE ply yarn 152. As a result, the single-fiber PE plying yarns 151 and 152 can be uniformly diffused in the same space and added at a higher density. In order to provide the short-fiber PE ply yarns (151, 152) as the first short-fiber PE ply yarn 151 and the second short-fiber PE ply yarn 152 having different lengths, the bite cuts the PE braided line to form several short-fiber PEs. When preparing the ply yarns 151 and 152, simply use two types of bites with different blade intervals.

In the case of blast furnace slag cement in the mortar for pipe repair and reinforcement according to the embodiment of the present invention, it contains blast furnace slag as the maximum component by weight, and ethrinzite (3CaO · Al ₂ O ₃ · 3CaSO ₄₎ through hydration reaction. · Contains auin, lime and anhydrous gypsum as essential ingredients to produce 32H ₂ O).

Looking specifically at the components of the blast furnace slag cement, 38 to 70% by weight of blast furnace slag, 5 to 15% by weight of gypsum, 6 to 20% by weight of auin, 0.3 to 2.5% by weight of water reducing agent or superplasticizer, and the balance Portland cement Including, but the Portland cement is included in less than 13% by weight so as to be less than 8% by weight of the total mortar composition, so that it is possible to achieve practical cementation of the Portland cement.

Looking at the specific components of the mortar for repairing and reinforcing pipes according to an embodiment of the present invention, and characteristics and roles thereof, are as follows.

division SiO ₂ Al ₂ O ₃ Fe ₂ O ₃ CaO MgO SO ₃ Ig. Loss Insol Cr ⁶⁺ Blast furnace slag cement 27.92 12.67 1.45 46.50 4.77 5.52 - - trace Ordinary cement 21.65 5.41 3.24 63.37 2.28 2.04 0.60 0.21 16ppm Blast furnace slag 34.82 14.41 0.44 41.99 6.62 0.20 - - Not detected

In the case of blast furnace slag cement that is the basis of the mortar for pipe repair and reinforcement according to the embodiment of the present invention, water blast furnace slag, Auin (calcium sulfoaluminate), anhydrite, lime (or quicklime), fluidizing agent, and ordinary cement are used. It consists of including. Here, the content of blast furnace slag, auin, anhydrite, and lime fluidizing agent is 70% or more of the total amount of the mixture, and the content of ordinary cement is 30% or less of the total weight of the mixture. Accordingly, as shown in Table 1 above, the hexavalent chromium content in the blast furnace slag cement is almost not detected at about 20% compared to ordinary cement. In the case of such blast furnace slag cement, Portland cement that generates hexavalent chromium is partially included, but since it can be adjusted to less than 8% by weight of the total mortar composition, it is practically possible to be cementless of Portland cement and the detection amount of hexavalent chromium is almost It can be seen that there is no

On the other hand, blast furnace slag, which is latent hydraulic, undergoes hydration by adding anhydrous gypsum (CaSO ₄ ), slaked lime (Ca(OH) ₂ ) or quicklime (CaO), which are stimulants. In the embodiment of the present invention, auin (calcium sulfoaluminate (3CaO·4Al ₂ O ₃ ·SO ₃ ) is added to promote hardening and greatly enhance the initial strength. Phosphorus-lime-anhydride gypsum mixture not only promotes the development of strength of blast furnace slag, but also generates ethrinzite hydrate (3CaO·Al ₂ O ₃ ·3CaSO ₄ ·32H ₂ O) at the beginning of hydration to compensate for shrinkage due to drying and crack This plays a role in expressing the main performance of eco-friendly cementless polymer mortar, and its chemical reaction formula is as follows.

3CaO·4Al ₂ O ₃ ·SO ₃ + 6CaO + 8CaSO ₄ + 32H ₂ O --> 3CaO·Al ₂ O ₃ ·3CaSO ₄ ·32H ₂ O

In the mortar for pipe repair and reinforcement according to the embodiment of the present invention, Auin (3CaO·4Al ₂ O ₃ ·SO ₃ ) contains limestone as a CaO component, and bauxite or alumina component as an Al ₂ O ₃ component. It is obtained by sintering at a temperature of 1,350°C a raw material containing inorganic materials and a mixture of gypsum as an SO ₃ component in a blending ratio in the following range.

Cm (lime saturation ratio = C-0.7(F+T+S')/1.87S+0.55A) is 0.60 or more,

A/S' (aluminum tree sulfuric acid ratio) = 2.0~4.5

(Here, C: CaO wt%, F: Fe ₂ O ₃ wt%, T: TiO ₂ wt%, S': SO ₃ wt%, S: SiO ₂ wt%, A: Al ₂ O ₃ wt%)

In the case of repairing and reinforcing the inner wall of the pipe using such a mortar, not only does the detection of hexavalent chromium hardly appear, but also the overall structural performance is improved.

Tables 2 and 3 below are summarized by confirming the experimental examples of the mortar according to the embodiments of the present invention and the results expressed accordingly.

division Experimental Example 1 Experimental Example 2 Experimental Example 3 Experimental Example 4 Conventional product Ordinary cement weight% - - - - 41.27 Alumina cement " - - - - 5 Anhydrite " - - - - 3 Blast furnace slag cement " 39.27 44.27 49.27 54.27 - Short fiber PE ply " 0.1 0.1 0.1 0.1 0.1 Polymer " 0.5 0.5 0.5 0.5 0.5 Thickener " 0.03 0.03 0.03 0.03 0.03 Foaming agent " 0.1 0.1 0.1 0.1 0.1 Fine aggregate " 60 55 50 45 50 system " 100.00 100.00 100.00 100.00 100.00

division Experimental Example 1 Experimental Example 2 Experimental Example 3 Experimental Example 4 Conventional product Flexural strength N/㎟ 13.4 14.1 14.6 15.3 10.3 Compressive strength " 58.1 61.4 64.1 66.8 45.0 Bond strength " 2.0 2.2 2.2 2.3 1.7 Alkali resistance (compression strength) " 53.7 56.0 58.9 61.2 42.7 Chloride ion penetration resistance coulomb 501 476 423 380 654 Neutralization resistance mm 1.6 1.5 1.5 1.3 1.7 Length change rate % -0.02 -0.02 -0.03 -0.03 -0.07

As can be seen from the table above, the mortar prepared through Experimental Examples 1 to 4 has excellent performance in flexural strength, compressive strength, adhesion strength, alkali resistance, chloride ion penetration resistance, neutralization resistance, and length change rate compared to conventional products. It was found that, in the range where the composition ratio of the blast furnace slag does not exceed 60% by weight, the higher the composition ratio of the blast furnace slag, the higher the performance. As described above, the Auin-lime-anhydrite mixture not only promotes the development of the strength of blast furnace slag, but also smoothly produces ethrinzite hydrate (3CaO·Al ₂ O ₃ ·3CaSO ₄ ·32H ₂ O) at the beginning of hydration and is dried. It is believed that this is because it compensates for the shrinkage caused by and prevents cracking.

On the other hand, Table 4 and Figure 5 below is a summary of the results obtained when the same amount of short fibers in the form of normal straight hair is added instead of adding the short fiber PE ply yarns 151 and 152 that are bent in a ring shape at both ends of the present invention.

division Experimental Example 5 Experimental Example 6 Experimental Example 7 Experimental Example 8 Ordinary cement weight% - - - - Alumina cement " - - - - Anhydrite " - - - - Blast furnace slag cement " 39.27 44.27 49.27 54.27 fiber " 0.1 0.1 0.1 0.1 Polymer " 0.5 0.5 0.5 0.5 Thickener " 0.03 0.03 0.03 0.03 Foaming agent " 0.1 0.1 0.1 0.1 Fine aggregate " 60 55 50 45 system " 100.00 100.00 100.00 100.00

division Experimental Example 5 Experimental Example 6 Experimental Example 7 Experimental Example 8 Flexural strength N/㎟ 12.4 13.1 13.6 14.3 Compressive strength " 56.3 59.7 62.2 65.1 Bond strength " 1.8 2.0 2.0 2.2 Alkali resistance (compression strength) " 53.7 56.0 58.9 61.2 Chloride ion penetration resistance coulomb 501 476 423 380 Neutralization resistance mm 1.6 1.5 1.5 1.3 Length change rate % -0.02 -0.02 -0.03 -0.03

As can be seen in Tables 4 and 5 above, compared to Experimental Examples 5 to 8 in which short fibers in the form of general straight hair were added, the previous experiment in which short fibers PE ply yarns (151, 152) having both ends of the present invention bent in a ring shape were added. In Examples 1 to 4, it was confirmed that there was a significant performance improvement in flexural strength, compressive strength, and adhesion strength.

Subsequently, a description will be given of a conduit repair/reinforcement composite according to an embodiment of the present invention comprising the mortar for conduit repair/reinforcement according to the embodiment of the present invention described above.

4 is a cross-sectional view of a repaired/reinforced pipe for explaining a repair/reinforcement composite constructed by the pipe repair/reinforcement method according to an embodiment of the present invention, and FIG. 5 is a repair viewed in the direction "A" of FIG. It is a reference diagram showing a reinforcing structure centered on a spider member among the reinforcing composites, and FIG. 6 is a perspective view of a spider member used in the pipe repair/reinforcement method according to an embodiment of the present invention, and FIG. 7 is a diagram illustrating an embodiment of the present invention. It is a cross-sectional view showing a state in which the spider member used in the pipeline repair and reinforcement method is fitted to the bolt head of the set anchor and fixed.

The conduit repair and reinforcement composite using a mortar for conduit repair and reinforcement according to an embodiment of the present invention is formed in a shape similar to a spider and is named as the spider member 110 by actively using the set anchor 120 The mortar's strength and adhesion can be enhanced while minimizing the use of ). Accordingly, the present invention reduces damage to the inner wall of the pipe due to excessive use of the set anchor 120 and improves workability by reducing the work process, as well as to enable maintenance and reinforcement having higher durability and strength. I did it.

Looking at the configuration of the conduit repair/reinforcement composite 100, as shown in the enlarged portion of FIG. 4, a reinforcing material in which the spider member 110, the set anchor 120, and the expanded metal 130 are combined, and a primer layer It consists of a hierarchical structure in which 140 and a mortar layer 150 and a finishing material layer 160 are stacked.

Here, the expanded metal 130 serves to support the mortar layer 150 as a main reinforcing material embedded in the mortar layer 150. The expanded metal 130 is made by pressing or cutting a metal sheet to expand it into a mesh shape, and the mesh is usually formed in a diamond shape. The expanded metal 130 has an advantage of being relatively advantageous in reinforcing the strength of the mortar layer 150 because it has structurally high rigidity compared to a wire mesh made by weaving wires.

The set anchor 120 is a combination of a socket 120a and a bolt 120b, and is fixed to the inner wall of a pipe at regular intervals to provide primary support for the expanded metal 130, and the spider member 110 ) Is fixed to the head of the bolt 120b of the set anchor 120 and serves to secondary support so that the expanded metal 130 is not excessively lifted or moved from the inner wall of the pipe. The spider member 110 is an anchor cap 111 that is forcibly fitted by a blow corresponding to the head of the bolt 120b of the set anchor 120 as shown in detail in FIGS. 6 and 7, and the anchor cap 111 It consists of a plurality of support rods 112 extending radially elongated centered on. In the drawing, the anchor cap 111 is formed in a rectangular block shape, and the support rod 112 is shown to have a shape extending in all directions from each side of the anchor cap 111 to each side. As such, although the shape of FIG. 6 may be said to be the most preferable shape of the spider member 110, it is not limited to a shape in which four support rods 112 extend in all directions around one of the anchor caps 111. The support rod 112 may be provided with two left and right or vertically per one anchor cap 111, or more than four, if necessary.

Here, the anchor cap 111 has a fitting groove 111a that is forcibly fitted to correspond to the head of the bolt 120b of the set anchor 120, as shown in FIG. 7, and has a gradually wide cross-sectional area as it goes toward the upper surface. It is desirable to secure a wide acupressure area while having stability. The support rod 112 of the spider member 110 has a bent portion 112a bent toward the inner wall of the pipe at its end, and is based on the length of the bent end portion 112a of the support rod 112, that is, the length of the bent portion 112a. By applying the mortar, it is possible to induce the mortar layer 150 to have a uniform thickness. Accordingly, when forming the mortar layer 150 by applying mortar, high-quality construction having a uniform thickness throughout the inner wall of the pipe becomes possible.

In addition, when the spider member 110 is installed, an additional operation of welding the support rod 112 and the expanded metal 130 to be integrated as necessary may be performed. When the support rod 112 and the expanded metal 130 are welded in this way, the spider member 110 and the expanded metal 130 are integrated, so that the spider member 110 supports the expanded metal 130 very firmly. You can do it.

Further, a plurality of annular protrusions 112b are formed on the support bar 112 of the spider member 110 with a space therebetween to increase the bonding strength with the mortar. As such, the annular protrusion 112b may be integrally formed when the support bar 112 is formed, but may be formed by inserting a ring to the support bar 112 at a work site. To this end, a ring for forming the annular protrusion 112b is made of rubber or urethane material having elasticity. In terms of the convenience of work, it may be better that the annular protrusion 112b is integrally molded with the support bar 112, but before installing the spider member 110, the protrusion is a method of inserting the annular ring into the support bar 112. The method of selectively forming 112b) is more preferable in terms of being able to perform construction suitable for the situation.

According to the configuration of the spider member 110 as described above, the expanded metal 130 can be stably supported so as not to be excessively lifted or moved from the inner wall of the pipe before the mortar is applied, and in the state embedded by the mortar, the spider member 110 ) The repair/reinforcement composite 100 including the primer layer 140, the mortar layer 150, and the finishing material layer 160 while forming a reinforcement material integrated with the expanded metal 130 and having a very large area per one It greatly contributes to having strength. One of the biggest advantages obtained from the use of the spider member 110 having a large support area for the expanded metal 130 is the number of set anchors 120 that were installed to support the expanded metal 130 Can be drastically reduced. Therefore, since the number of drilling the inner wall of the pipe line for installation of the set anchor 120 can be greatly reduced, the damage inflicted on the inner wall of the pipe can be minimized, compared to the case of installing the set anchor 120 individually, the spider member 110 When using, the work process and time can be significantly reduced.

Subsequently, a method of repairing and reinforcing pipes using mortar for repairing and reinforcing pipes according to an embodiment of the present invention will be described in detail below. However, Figure 8 is a flow chart for explaining the pipe repair and reinforcement method according to an embodiment of the present invention, Figures 9a to 9e are a series for explaining the detailed process of the pipe repair and reinforcement method according to an embodiment of the present invention It is a reference diagram.

Pipeline repair and reinforcement method using mortar for pipe repair and reinforcement according to an embodiment of the present invention is a preparatory operation step (S11), a surface treatment step (S12), a primer application step (S13), and a set anchor as shown in FIG. Installation step (S14), expanded metal installation step (S15), spider member installation step (S16), mortar application (S17), mortar curing (S18), finishing material application step (S19), post-treatment step (S20). Including.

The pipe repair and reinforcement method can repair and reinforce damaged pipes with high quality through the above processes.In particular, by using the spider member 110 to minimize the use of the set anchor 120 for supporting reinforcement, it is already damaged or cracked. , Corrosion, leakage, etc., to minimize additional damage to the inner wall of the pipe, and improve workability by reducing the work process for installing the set anchor 120, while improving the strength and adhesion of the mortar applied to the inner wall of the pipe. It was made to be able to strengthen.

Hereinafter, a method of repairing and reinforcing a pipeline according to an embodiment of the present invention will be described in detail, focusing on each of the above steps.

First, in the preparatory work step (S11), the internal condition of the damaged pipe is investigated. To this end, a CCTV-equipped investigation device is inserted into the pipeline, or the operator in charge of the investigation directly enters the pipeline and inspects it with the naked eye to record and report. And, based on the surveyed matters, the soil and sludge accumulated in the pipe are removed. To this end, the dredger inserts a dredging hose with a high-pressure suction power into the pipe to inhale the soil and sludge, and the washing vehicle sprays high-pressure water into the pipe to remove the soil and sludge remaining after dredging as cleanly as possible. In addition, if necessary, water turns are also performed for the work section.

In the surface treatment step (S12), portions having a non-uniform surface, including portions protruding from the inner wall of the pipe, are polished and removed using a shaving or chipping machine. At this time, for parts with severe damage, partial repair is carried out by filling them with a repair material separately from applying mortar later.

In the primer application step (S13), prior to applying the mortar, the primer is first applied to the inner wall of the pipe as shown in FIG. 9A in order to improve the adhesion of the mortar. In the case of the mortar used in the embodiment of the present invention, the adhesion to the inner wall of the conduit made of concrete is excellent, but a primer is applied to secure more sufficient adhesion. The design of the primer is related to the chemical properties of the resin binder used in the mortar. For example, acrylic binders are used with methyl methacrylic acid binders, and styrene or urethane binders are used with polyester polymer concrete. In addition, epoxy or modified epoxy resin is commonly used as a general polymer concrete overlay binder.

In the step of installing the set anchor 120 (S14), the inner wall of the pipe is drilled to form a hole at a predetermined interval, and then the set anchor 120 is hit as shown in FIG. 9A to be installed. At this time, the number of installations of the set anchors 120 is installed in a minimum number only to the extent that it can temporarily support the expanded metal 130 to be installed later.

In the step of installing the expanded metal 130 (S15), before applying the mortar, the expanded metal 130 cut to an appropriate size as shown in FIG. 9B is inserted into the pipe, and then the minimum number is installed. It is fixed to the set anchor 120. Then, expand the expanded metal to the extent that it adheres to the inner wall of the pipe using an expander. In this way, if the expanded metal 130 is installed before applying the mortar, the strength can be reinforced to a higher level than the case where only mortar is applied. In the case of the expanded metal 130, it is more advantageous in terms of strength reinforcement than a wire mesh in which wires are woven.

In the step of installing the spider member 110 (S16), the spider member 110 is installed as shown in FIG. 9C. As described above, the spider member 110 has an anchor cap 111 that is forcibly fitted by a blow corresponding to the head of the bolt 120b of the set anchor 120 and radially around the anchor cap 111 It is made up of a number of support rods (112) extended in length. With respect to the spider member 110 having such a configuration, first, the anchor cap 111 is fixed by hitting the head of the bolt 120b of the set anchor 120, and then expanded using the support rod 112 of the spider member 110. Ded metal 130 is supported so as not to be excessively lifted or moved from the inner wall of the pipe. At this time, the end of the support bar 112 is bent toward the inner wall of the pipe (may be bent in advance or may be bent at the time of installation on site), and the thickness of the mortar applied based on the bent end length of the bent support bar 112 It is desirable to be able to evenly match. In addition, the support rod 112 of the spider member 110 and the expanded metal 130 may be partially welded to be integrated. If the annular ring forming the protrusion 112b in the support bar 112 is not integrally molded with the support bar 112 and is made of rubber or urethane material that is selectively fitted at the work site, leave a space between the support bar 112 The fitting operation is pre-processed before hitting the spider member 110 to the anchor set and fixing it. Accordingly, when the installation of the spider member 110 is completed, the expanded metal 130 can be stably supported so that the expanded metal 130 is not excessively lifted or moved from the inner wall of the pipe by the support bar 112 covering a large area. When it is buried by this, it greatly contributes to having high strength as a whole of the repair/reinforcement composite 100.

In the mortar application step (S17), the mortar layer 150 is formed by applying mortar to the inner wall of the pipe as shown in FIG. 9D. In the case of the mortar applied in this way, the expanded metal 130 and the spider member 110 are combined with each other because the eco-friendly material is used, and the both ends contain short-fiber PE ply yarns (see Fig. 7 151,152) bent in a ring shape. The reinforcement/reinforcement composite 100 has an integral internal structure due to a large increase in performance, thereby contributing to an increase in strength including tensile strength. The configuration of such a mortar will be described in more detail later.

In the mortar curing step (S18), the mortar applied to the inner wall of the pipe is cured.

In the finishing material application step (S19), a finishing material that functions to prevent deterioration or corrosion as shown in FIG. 9E is applied to the cured mortar surface to form a finishing material layer 160.

In the post-processing step (S20), the equipment used for the previously performed operations is withdrawn out of the pipeline, and operations such as cleaning are performed. This completes the conduit repair and reinforcement method according to the embodiment of the present invention.

Although the preferred embodiment of the present invention has been described above, the present invention can use various changes, modifications, and equivalents. It is clear that the present invention can be applied equally by appropriately modifying the above embodiments. Therefore, the above description does not limit the scope of the present invention determined by the limits of the following claims.

110: spider member 120: set anchor
130: expanded metal 140: primer layer
150: mortar layer 160: finishing material layer

Claims (10)

It is an eco-friendly mortar for pipe repair and reinforcement for use in pipe repair and reinforcement methods to repair and reinforce old or damaged pipe lines.
Blast furnace slag cement 49-55% weight, PE ply 0.05-0.2% weight, polymer 0.2-1.5% weight, thickener 0.02-0.1% weight, foaming agent 0.05-0.2% weight and 40-50% weight of fine aggregate, but the PE ply Is added in a uniformly dispersed form, provided with short fiber PE plying yarns of 3 to 6 cm in length with both ends bent in a ring shape in order to increase bonding and tensile strength,
The short-fiber PE plying yarn, in which both ends are bent in a ring shape, is produced by applying a tensile force to the PE plying string and cutting the PE plying string into several short strands in that state.An eco-friendly mortar for pipe repair and reinforcement. delete The method of claim 1,
The short fiber PE plying yarn is an eco-friendly mortar for repairing and reinforcing a pipe, characterized in that the first short fiber PE plying yarn of 3 to 4 cm in length and the second short fiber PE plying yarn of 5 to 6 cm in length are mixed and provided. delete The method of claim 1,
The blast furnace slag cement contains blast furnace slag as the largest component by weight, and can produce ethrinzite (3CaO · Al2O ₃ · 3CaSO ₄ · 32H ₂ O) through a hydration reaction. Further comprising gypsum, the production of ethrinzite through the hydration reaction of the auin, lime, anhydrite,
3CaO·4Al ₂ O ₃ ·SO ₃ + 6CaO + 8CaSO ₄ + 32H ₂ O --> 3CaO·Al ₂ O ₃ ·3CaSO ₄ ·32H ₂ O Eco-friendly mortar for repair and reinforcement of pipelines characterized by conforming to. The method of claim 5,
Blast furnace slag 50 to 70% by weight, gypsum 5 to 15% by weight, auin 6 to 20% by weight, water reducing agent or superplasticizer 0.3 to 2.5% by weight, and the balance of Portland cement, the auin as a CaO component It contains limestone, contains bauxite as an Al2O3 component, or inorganic material with an Al2O3 component, and contains gypsum as an SO3 component, Cm (lime saturation ratio = C-0.7(F+T+S')/1.87S+) 0.55A) is 0.60 or more and A/S' (aluminum water sulfuric acid ratio) is in the range of 2.0 to 4.5, manufactured by firing at a temperature of 1,350°C. Eco-friendly mortar.
(Here, C: CaO% weight, F: Fe2O3% weight, T: TiO2% weight, S': SO3% weight, S: SiO2% weight, A: Al2O3% weight) It is a pipeline repair and reinforcement complex applied to the pipeline repair and reinforcement method to repair and reinforce old or damaged pipelines.
A primer layer formed by applying a primer to the cleaned and surface-treated inner wall of the pipe;
A mortar layer formed by applying the eco-friendly mortar of any one of claims 1, 3, 5 and 6 to the primer layer;
Expanded metal is buried inside the mortar layer while surrounding the inner wall of the pipe to support the mortar layer;
A set anchor fixed to the inner wall of the pipe at regular intervals to first support the expanded metal and embedded in the mortar layer;
A spider member fixed to the bolt head of the set anchor and embedded in the mortar layer in a state in which the expanded metal is secondarily supported so as not to be excessively lifted or moved from the inner wall of the pipe;
It includes a finishing material layer applied to the mortar layer,
The spider member is composed of an anchor cap that is forcibly fitted by a hit corresponding to the bolt head of the set anchor, and a plurality of support rods extending radially long around the anchor cap, and the bolt head of the set anchor before applying the mortar A pipeline repair/reinforcement composite, characterized in that the expanded metal can be supported by the support bar so that the expanded metal does not excessively lift or move from the inner wall of the pipe while the anchor cap is fixed to the pipe. The method of claim 7,
The end of the support rod of the spider member is formed in a form bent toward the inner wall of the pipe, and the thickness of the mortar layer is uniformly formed based on the length of the bent end of the support rod. The method of claim 8,
A pipe repair/reinforcement composite, characterized in that a plurality of protrusions are formed in the form of a ring-shaped ring inserted at a distance from the support bar of the spider member to increase the bonding strength with the mortar. As a pipeline repair and reinforcement method to repair and reinforce old or damaged pipelines,
Cleaning and surface treatment of the inner wall of the pipe;
Forming a primer layer by applying a primer to the inner wall of the pipe;
Constructing expanded metal in a shape surrounding the inner wall of the pipe;
Perforating the inner wall of the pipe to form perforated holes at regular intervals, and then hitting the set anchor to install;
Installing a spider member;
Forming a mortar layer by applying the eco-friendly mortar of any one of claims 1, 3, 5 and 6 to the inner wall of the pipe;
Curing the mortar applied to the inner wall of the pipe; And
Forming a finishing material layer by applying a finishing material so that deterioration or corrosion does not occur on the mortar cured in the inner wall of the pipe; includes,
The spider member is composed of an anchor cap that is forcibly fitted by a blow corresponding to the bolt head of the set anchor, and a plurality of support rods extending radially around the anchor cap, and in the step of installing the spider member, the spider A pipe repair and reinforcement method, characterized in that after hitting the anchor cap of the member to the bolt head of the set anchor and fixing it, the expanded metal is supported so that the expanded metal does not excessively lift or move from the inner wall of the pipe using a support rod of the spider member.

Images