KR102590452B1 - Method for repairing and reinforcing structures using preprocessing equipment and hybrid compositions thereof - Google Patents

Abstract

The present invention, a dust collection unit; A dust collection head connected to the dust collection unit and a suction pipe, with a mounting hole formed in the center, an opening at the bottom, and a shape whose diameter increases downward; It relates to a preprocessing device comprising a grinder, which is mounted on the mounting hole and includes a rotating shaft rotated interlocked by a driving means and a disk at the bottom of the rotating shaft.

Description

Structure repair and reinforcement method using pretreatment device and hybrid composition {METHOD FOR REPAIRING AND REINFORCING STRUCTURES USING PREPROCESSING EQUIPMENT AND HYBRID COMPOSITIONS THEREOF}

The present invention relates to a technology that is applied to the repair and reinforcement of structures using a pretreatment device and a hybrid composition to facilitate the process, control the occurrence of environmental problems, and improve durability.

With the growth of the national economy and the expansion of social overhead capital, measures are needed to improve the durability and secure economic feasibility of important structures in coastal industrial complexes and coastal port areas.

In the case of existing painting methods for repainting steel (steel bridge) structures, surface treatment requires the removal of all visible foreign substances up to 95% of the surface area, which can cause traffic congestion in urban areas and environmental problems in coastal and mountainous areas. .

Meanwhile, despite its high durability, concrete structures suffer from structural problems due to deterioration over time.

These deterioration phenomena appear in various ways, but cracks occur due to drying shrinkage and temperature shrinkage inherent in the physical properties of the concrete itself. Neutralization of the concrete is promoted in the cracks of these structures, and at the same time, deterioration phenomena occur in the concrete part in a complex manner. There is a problem where the surface of the structure shows peeling and peeling.

Accordingly, repair/reinforcement is inevitable in these concrete structures due to structural problems such as deterioration over time and changes in external load, and various mortars are proposed as such repair/reinforcement mortars.

Accordingly, in Korea Patent Registration No. 635464, 10 to 39.5% by weight of cement; 30-35% by weight fine aggregate; 10-15% fly ash by weight; Lightweight beads made of 5-10% by weight ceramic material, specific gravity of 0.8-1, and particle diameter of 60-150μm; 3 to 5% by weight of CSA expansion material; 2 to 5% by weight of silica fume; 0.2 to 0.5% by weight of fluidizing agent; 10 to 19.5% water by weight; and PVA reinforcing fibers each having a length of 8 to 12 mm and 1 to 3% of the total volume. A mortar reinforced with fibers including:

However, the above technology can also cause traffic congestion in urban areas and environmental problems due to dust in coastal and mountainous areas when treating the surface of structures for repair and reinforcement.

1. Republic of Korea Patent Registration No. 10-0910983 2. Republic of Korea Patent Registration No. 10-635464

The present invention is intended to solve the above problems, and is intended to provide a device and method that can facilitate surface treatment in repairing and reinforcing structures, control environmental problems such as dust, and improve the durability of structures. am.

The pretreatment device of the present invention (hereinafter referred to as “apparatus of the present invention”) to solve the above problems includes a dust collection unit; A dust collection head connected to the dust collection unit and a suction pipe, with a mounting hole formed in the center, an opening at the bottom, and a shape whose diameter increases downward; It is characterized in that it includes; a grinder including a rotating shaft that is mounted on the mounting hole and rotated interlocked by a driving means and a disk at the lower end of the rotating shaft.

As an example, the dust collection head is characterized in that an rim ring is formed at the bottom, and a plurality of wheels are formed at the bottom of the rim ring.

As an example, a leakage prevention ring with a plurality of fiber threads protruding downward is installed inside the border ring.

As an example, the dust collection head is characterized in that a plurality of striking ends protrude from the inner periphery of the side wall, and soundproofing pads are installed between the striking ends.

As an example, the upper part of the striking end divides the dust collection head into upper and lower parts, and a mesh network through which the rotation axis passes is further formed in the central part.

Meanwhile, the structure repair and reinforcement method using the pretreatment device and hybrid composition of the present invention (hereinafter referred to as the “method of the present invention”) includes the step of organizing the surface to be coated on the structure using the pretreatment device (S10); A step (S20) of painting the cleaned surface with a hybrid composition containing a resin, a hardener, a pigment, a metal nanoparticle oxide, a ceramic powder, a dispersant, a thickener, a filler, and a stabilizer. .

As an example, the step of organizing the surface to be coated of a structure (S10) includes the step of treating the surface of the surface of the structure using the pretreatment device (S11); It is characterized in that it includes a step (S12) of restoring the cross section of the surface to be coated in the structure.

As an example, step S12 is characterized by restoring the cross section of the surface to be painted in the structure using a polymer mortar composition containing cement, polybutylene terephthalate resin, calcium sulfur aluminate, antifoaming agent, and silicone water repellent.

The present invention uses a pretreatment device to control scattering during construction, suppress noise, minimize the amount of waste due to surface treatment, facilitate the process, and shorten the construction period to reduce traffic congestion and environmental damage. It has the advantage of minimizing problems.

In addition, the present invention can improve durability by improving resistance to waterproofing, corrosion, etc. by painting in the form of a dense square grid structure on the surface to be coated in the repair and reinforcement of concrete structures or steel structures. There is an advantage.

1 is a schematic diagram showing the device of the present invention;
Figure 2 is a side cross-sectional view showing one embodiment of the device of the present invention;
Figure 3 is a perspective view of the leakage prevention ring shown in Figure 2;
4 and 5 are side cross-sectional and rear views showing another embodiment of the present invention;
Figure 6 is a block diagram showing the method of the present invention.

Hereinafter, the present invention will be described in more detail through examples. Embodiments according to the present invention may be modified into various other forms, so the scope of the present invention is not limited to the embodiments described below.

As shown in Figure 1, the device (1) of the present invention includes a dust collection unit (2); A dust collection head (4) connected to the dust collection unit (2) and the suction pipe (3), with a mounting hole (41) formed in the center, an opening at the bottom, and a shape whose diameter increases downward; It is characterized in that it includes a grinder (5) which is mounted on the mounting hole (41) and includes a rotating shaft (51) rotationally interlocked by a driving means and a disk (52) at the lower end of the rotating shaft (51).

The dust collection unit 2 is configured to suction and purify dust caused by grinding the surface of the structure by the grinder 5. Various known technologies exist for suction and purification of the dust collection unit 2, so detailed description thereof is omitted.

The dust collection head (4) is connected to the dust collection unit (2) and the suction pipe (3), and is characterized by a mounting hole (41) formed in the center, an opening on the lower surface, and a shape where the diameter increases downward.

As shown in the drawing, the dust collection head 4 is configured to surround the disk 52 to control the outflow of by-products such as dust generated by grinding to the outside, and to prevent the outflow of noise from the grinding process to the outside. It's about controlling it.

A mounting hole 41 is formed at the top of the dust collection head 4, so that the grinder 5 is mounted through the mounting hole 41. Various known structures may be applied to mounting the grinder 5 to the mounting hole 41, and detailed description thereof will be omitted.

Meanwhile, in the present invention, an embodiment of the dust collection head 4 is presented in FIG. 2.

The dust collection head 4 of this embodiment is characterized in that an rim ring 43 is formed at the bottom of the side wall 42, and a plurality of wheels 431 are formed at the bottom of the rim ring 43. Constructed in this way, it facilitates flow even on the surface of a structure with reduced smoothness.

In addition, in this embodiment, as shown in FIGS. 2 and 3, a leakage prevention ring 44 with a plurality of fiber yarns 442 protruding downward is installed inside the border ring 43.

As shown in the drawing, the leakage prevention ring 44 includes an attachment ring 441 attached to the inside of the border ring 43 and a plurality of fiber yarns 442 protruding downward from the bottom of the attachment ring 441. It consists of

The fiber yarn 442 is intended to prevent dust, etc. from leaking between the rim ring 43 and the wheel 431 by ensuring that at least the lower end is in contact with the surface of the structure during the grinding operation.

In addition, the fiber yarn 442 allows foreign substances deposited on the surface of the structure to be swept away during the moving operation, thereby facilitating the suction of dust, etc. through the suction pipe 3.

Conventionally, when the dust collection head moves during grinding work, the lower part of the dust collection head comes into contact with the structure and flows, so the ground dust reattaches to the structure by compression of the dust collection head, necessitating a separate removal operation. In this embodiment, the fiber yarn (442 ) flows in contact with the surface of the structure to control reattachment.

The material of the fiber yarn 442 is not limited, and for example, polyethylene may be used.

In addition, in the present invention, a dust collection head 4 of another embodiment is presented. The dust collection head 4 of this embodiment has a plurality of striking ends 45 protruding from the inner periphery of the side wall 42, and between the striking ends 45. It is characterized by being equipped with a soundproofing pad (46).

As shown in the drawing, the striking end 45 protrudes in plural numbers from the inner periphery of the side wall 42 and breaks the grinding by-products with relatively large particle diameters blown in the direction of the side wall 42 by centrifugal force during the grinding operation, thereby breaking the suction pipe ( 3) This is to control clogging when inhaling dust, etc. to increase the removal efficiency of grinding by-products.

In addition, as shown in the drawing, a soundproofing pad 46 is attached to the side wall 42 between the striking ends 45, so that the striking ends 45 directly prevent grinding by-products with a large particle size from being blown to the soundproofing pad 46. The purpose is to improve the durability of the soundproofing pad 46 by controlling the impact to some extent.

In addition, the configuration of the soundproof pad 46 prevents noise generated during grinding from leaking to the outside.

Since the soundproofing pad 46 may be made of various known materials, detailed description thereof will be omitted.

In addition, in this embodiment, the upper part of the striking end 45 divides the dust collection head 4 into upper and lower parts, and a mesh network 47 through which the rotation axis 51 penetrates is further formed in the central part. .

In this way, the mesh network 47 is configured to control the by-product (S2) with a large particle size from flowing into the upper space, and to ensure that only the by-product (S1) with a small particle size flows into the upper space and is sucked through the suction pipe (3). will be.

When a by-product (S2) with a large particle size is sucked into the suction pipe (3), it acts as a factor that blocks the suction pipe (3) or causes a load on the dust collection unit (2). By-products with a small particle size are released through the mesh net (47). Only (S1) is allowed to be inhaled through the suction pipe (3).

The by-product (S2) with a large particle size descends again and is pulverized into a by-product (S1) with a small particle size through grinding.

The grinder 5 is mounted on the mounting hole 41 and includes a rotating shaft 51 that is rotated by a driving means and a disk 52 at the lower end of the rotating shaft 51.

The surface of the structure is ground by the rotation of the disk 52, and by-products such as dust are discharged to the outside during the grinding process through the above-mentioned operating mechanism.

Since various known technologies exist for this grinder 5, a detailed description of its structure and operating mechanism will be omitted.

Meanwhile, as shown in FIG. 6, the method of the present invention includes the step of organizing the surface to be coated on the structure using the preprocessing device (1) (S10); A step (S20) of painting the cleaned surface with a hybrid composition containing a resin, a hardener, a pigment, a metal nanoparticle oxide, a ceramic powder, a dispersant, a thickener, a filler, and a stabilizer. .

Here, the term “structure” refers to a concept that includes various steel structures or various concrete structures, and the method of the present invention is applied to the repair and reinforcement of these various steel structures or various concrete structures to improve the durability of the structure. will be.

First, the method of the present invention has a step (S10) of organizing the surface to be coated on the structure using the preprocessing device (1).

In this step (S10), in the case of a steel structure, the old old film is treated using the pretreatment device (1).

In addition, the present invention provides an example in which a process for applying the auxiliary painting composition to be described below is provided before the painting process in step S20.

The auxiliary coating composition has excellent permeability to rust, making it easy to penetrate into rust, and has excellent adhesion due to its excellent bonding power with metal. After completely removing only the loose scale and rust on the surface of the steel structure and simply treating the old paint film, the auxiliary coating composition is applied before rust occurs while the temperature of the metal surface is 3°C or higher above the dew point.

In this way, painting is possible with just a simple treatment of the old film, making it economical in terms of cost and time.

For this purpose, the auxiliary coating composition is characterized by being composed of a base material containing epoxy resin, the aliphatic compound butyl cellosolve, mica, talc, zinc metal, and aluminum powder, and a hardener containing polyamide.

The subject matter is 3 to 7 parts by weight of the aliphatic compound butyl cellosolve, 5 to 10 parts by weight of mica, 30 to 40 parts by weight of talc, 25 to 35 parts by weight of zinc metal, and 25 to 35 parts by weight of aluminum powder for 100 parts by weight of the epoxy resin. It is appropriate to mix by weight.

The aliphatic compound butyl cellosolve is used as a solvent, and limiting the mixing amount to 3 to 7 parts by weight is effective for dissolving epoxy resins and dispersing other compositions.

The zinc metal is used as a pigment, and since it has a greater ionization tendency than iron, it emits electrons more quickly and prevents iron from being oxidized. In addition, the mica and talc serve as pigments to improve the hardness of the undercoating layer.

As described above, it is reasonable to mix zinc metal, mica, talc, and aluminum powder used as pigments in a limited composition ratio as mentioned above. Below the limited range, the rust prevention and hardness enhancement effects are minimal, and the limited range is limited. If it is exceeded, dispersion is not carried out properly and the adhesion strength is lowered, so it is limited to this level.

In the above auxiliary coating composition, the mixing ratio of the base material and the hardener is preferably 6:1 to 6.5:1 by volume. When the mixing weight ratio satisfies the above range, it forms a strong bond with the steel structure and exhibits excellent rust prevention function.

In other words, in the auxiliary coating composition, the strong adhesion of the epoxy resin, the excellent rust prevention function by zinc metal, and the curing reaction of mica and talc work synergistically to provide excellent adhesion to steel structures and excellent rust prevention function.

Meanwhile, the step of organizing the surface to be coated using the pre-treatment device 1 of the structure (S10) includes the step of treating the surface of the surface of the structure using the pre-treatment device 1 (S11); It is characterized in that it includes a step (S12) of restoring the cross section of the surface to be coated in the structure.

Here, the structure will be a concrete structure and will mainly be applied for repair and reinforcement of existing concrete structures.

In the step (S11) of treating the surface of the structure to be coated, the surface of the concrete structure is treated to remove impurities from the surface to be coated using the pretreatment device (1).

Next, there is a step (S12) of restoring the cross-section of the surface to be painted, which can be mainly applied to concrete structures, and restores the cross-section to the surface to be painted and adjusts the background.

In the present invention, in step S12, the cross section of the surface to be painted on the structure is restored using a polymer mortar composition containing cement, polybutylene terephthalate resin, calcium sulfuraluminate, antifoaming agent, silicone water repellent, and rust preventive. An example is provided.

Preferably, the polymer mortar composition contains 5 to 20 parts by weight of polybutylene terephthalate resin, 3 to 8 parts by weight of calcium sulfuraluminate, 1 to 3 parts by weight of sodium tartrate, and 0.5 to 2 parts by weight of antifoaming agent, based on 100 parts by weight of cement. , it is reasonable to mix 0.5 to 2 parts by weight of silicone water repellent.

In the present invention, fast-hardening cement may be included in the cement, and while developing fast-hardening properties, fly ash or blast furnace slag may be used as a mixture to partially replace cement.

The fast-setting cement preferably uses one of calcium sulfoaluminate-based (CSA-based), alumina cement, and calcium aluminate-based (C12A7-based) or a mixture thereof in order to exhibit ultra-fast hardening.

The polybutylene terephthalate (hereinafter referred to as “PBT”) has excellent mechanical properties and is widely used as automobile parts, electrical parts, mechanical parts, and industrial resins.

The calcium sulfuraluminate is an expanding agent and is used to control cracks such as temperature cracks that may occur during the curing process.

The sodium tartrate forms a stable water-soluble chelate with divalent and trivalent metal ions and forms a chelating rust-prevention film, thereby preventing corrosion of the rebar in the paste or elution of rust.

In addition, the workability of sodium tartrate is improved by the electrostatic repulsion of cations (Na ⁺ ), which solves the problem that workability may be reduced by the addition of PBT by adding sodium tartrate. In addition, as mentioned above, the rust prevention function is also implemented.

As mentioned above, after going through step S10 for the structure, there is a step (S20) of painting the cleaned surface with the hybrid composition.

By doing this, in steel structures, a painting layer is formed by the hybrid composition, and in concrete structures, a cross-sectional restoration layer is formed by the polymer mortar composition, and a painting layer by the hybrid composition is formed on top of the cross-sectional restoration layer.

In particular, the hybrid composition is characterized by containing a resin, a curing agent, a pigment, a metal nanoparticle oxide, a ceramic powder, a dispersant, a thickener, a filler, and a stabilizer.

The coating composition preferably contains 10 to 20 parts by weight of hardener, 6 to 40 parts by weight of pigment, 6 to 40 parts by weight of metal nanoparticle oxide, 3 to 10 parts by weight of ceramic powder, and 2 to 5 parts by weight of dispersant, based on 100 parts by weight of resin. , it is appropriate to include 2 to 5 parts by weight of a thickener, 5 to 10 parts by weight of a filler, and 2 to 5 parts by weight of a stabilizer.

The hybrid composition has a pigment with an average particle size of 1 to 40㎛ and metal nanoparticles of 40 to 250㎚, which have the effect of filling the pores of large particles due to differences in particle size and density, forming a dense square lattice of the resin, pigment and metal nanoparticles. By forming a passive film in the form of a structure (cube structure, hereinafter referred to as “nanocube”), functions such as wear resistance, salt resistance, corrosion resistance, and adhesion are improved, thereby protecting the surface to be coated and blocking the penetration of harmful factors, thereby extending the life of the structure. This is to enable it to be increased.

The type of the resin is not limited, and as an example, an epoxy resin may be either a reaction product of epichlorohydrin and bisphenol A or an epoxy resin composed of a reaction product of epichlorohydrin and bisphenol F.

The pigment has an average particle diameter of 1 to 40㎛, and it is reasonable for the metal nanoparticle oxide to have a particle diameter of 40 to 250㎚, which means that the pigment has the same basic arrangement for each particle, but has a different orientation and particle to particle. The more grain boundaries per unit area there are, the stronger the mechanical properties tend to be, which serves as a frame for the flake structure.

This is to form a tight square structure of the coating film by filling the frame of this flake structure with fine metal nanoparticle oxides.

It is reasonable to limit the pigment to have an average particle diameter of 1 to 40㎛. The reason for this limitation is that if the particle size is smaller than this, the function as a sufficient frame is minimal, and if it exceeds this, the specific gravity may become too large and dispersibility may decrease, resulting in non-uniform physical properties.

In the case of the above pigment, the type is not limited, and examples include lead, cadmium, mercury, arsenic, antimony and their compounds and hexavalent chromium compounds, and one or more of titanium dioxide, talc, silicon dioxide, and aluminum powder. Mixtures may be applied.

In addition, it is reasonable to limit the metal nanoparticle oxide to have an average particle diameter of 40 to 250 nm.

Here, if the metal nanoparticle oxide is less than 40 nm, the average particle size distribution is too low and the price is high, making it uneconomical, and if it exceeds 250 nm, the average particle size distribution is large, creating voids between flakes formed in the pigment. It is limited as such because if it is not filled properly, the airtight structure will be impaired.

In the case of the metal nanoparticle oxide, the type is not limited, and examples include titanium dioxide, silicon dioxide, manganese, magnesium, aluminum, zinc oxide, indium tin oxide, magnesium silicate, magnesium oxide, antimontine oxide, kaolin, and dioxide. One or a mixture of two or more of silica, alumina trioxide, molybdenum trioxide, niobium pentoxide, vanadium pentoxide, and tungsten bronze may be applied.

The type of the curing agent is not limited, and as an example, a polyamide room temperature curing type curing agent may be used.

Additionally, it is preferable to use a surfactant (Unsaturated Polymide Acid Ester Salts) as a dispersant.

Additionally, it is preferable to use organic clay as a thickener.

Meanwhile, the filler may include carbon graphite and butyl rubber.

The carbon graphite is used to reinforce strength and improve impact resistance to external shock. By adding carbon graphite, which is a conductor, the generation of static electricity is controlled to prevent foreign substances from being deposited on the surface due to static electricity. In other words, the accumulation of foreign substances can cause problems such as corrosion on the surface, so this must be controlled.

In addition, butyl rubber is added in addition to the carbon graphite. The butyl rubber is a rubber obtained by ionic polymerization of isobutylene and a small amount of isoprene in a liquid state at a low temperature, and is composed of 1.5 to 4.5% of isobutylene with a purity of 99% or more. It is made by adding an isoprene mixture and pure methyl chloride, adding anhydrous aluminum chloride as a catalyst, and then placing it in a polymerization reactor and polymerizing it at a low temperature of about -100℃. Depending on the degree of unsaturation, pattern viscosity, and presence or absence of contamination, halogenated butyl rubber and polyisobutyl are produced. It is divided into several types, including ren.

This butyl rubber absorbs shock well and has flexibility even at temperatures as low as -50°C because the elastic material does not crystallize well even at low temperatures.

The reason for adding the butyl rubber is not only to strengthen the impact resistance, but also to prevent the impact of such expansion and contraction even when the paste continues to expand and contract in the process of repeated freezing and thawing in the winter due to the material characteristic of not losing elasticity even at low temperatures. By alleviating this, cold resistance can be improved.

In other words, if the paste is repeatedly frozen and thawed at low temperatures, cracks may occur in the paste due to repeated stretching. However, since butyl rubber can maintain elasticity even at low temperatures, it can compensate for this stretching, preventing cracks in the paste due to freezing and thawing. It becomes possible to control abnormalities.

The ceramic powder is intended to exhibit antibacterial function in the coating layer formed by the composition. In other words, in cases where structures are particularly vulnerable to corrosion, such as sewer pipes, corrosion caused by bacteria, etc. is controlled by adding ceramic powder that exhibits this antibacterial function.

The ceramic is characterized in that it is a mixture of one or more of orthite, hydroxyapatite, alumina, silica, ileite, and magnesia.

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is of course not limited to the above embodiments, and those skilled in the art in the field to which the present invention pertains can easily understand the above-described contents. Of course, various modifications and variations may be possible.

1: device
2: Dust collection unit
3: suction pipe
4: Dust collection head
5: Grinder

Claims (8)

dust collection unit;
A dust collection head connected to the dust collection unit and a suction pipe, with a mounting hole formed in the center, an opening at the bottom, and a shape whose diameter increases downward; and
It is mounted on the mounting hole and includes a grinder including a rotating shaft that is rotationally interlocked by a driving means and a disk at the bottom of the rotating shaft,
The dust collection head is,
A border ring is formed at the bottom of the side wall, and a plurality of wheels are formed at the bottom of the border ring, and is composed of an attachment ring attached to the inside of the border ring and a plurality of fibers protruding downward from the bottom of the attachment ring. An anti-leakage ring is provided, and a plurality of striking ends are protruding along the inner periphery of the side wall to hit large-diameter grinding by-products flying in the direction of the side wall. A soundproofing pad is attached to the side wall between the striking ends and the striking ends, A pretreatment device characterized in that a mesh network is formed on the upper part of the striking end to divide the dust collection head into upper and lower parts and through which the rotating shaft passes in the central part to prevent by-products with large particle sizes from flowing into the upper space.
delete delete delete delete A step of organizing the surface to be coated on the structure using the preprocessing device of claim 1 (S10);
Painting the cleaned surface with a hybrid composition containing resin, hardener, pigment, metal nanoparticle oxide, ceramic powder, dispersant, thickener, filler, and stabilizer (S20);
A structural repair and reinforcement method using a pretreatment device and a hybrid composition comprising a.
According to clause 6,
In the step of organizing the surface to be coated on the structure (S10),
Processing the surface of the structure to be coated using the pretreatment device of claim 1 (S11);
A step of recovering the cross section of the surface to be coated in the structure (S12);
A structural repair and reinforcement method using a pretreatment device and a hybrid composition comprising a.
According to clause 7,
In step S12,
Structure repair using a pretreatment device and hybrid composition, characterized in that the cross-section of the surface to be coated in the structure is restored by a polymer mortar composition containing cement, polybutylene terephthalate resin, calcium sulfuraluminate, antifoaming agent, and silicone water repellent. ·Reinforcement method.