KR102247034B1 - Textile sheet and reinforcement panel for concrete structure and method of repair and reinforcement method of structure using the same - Google Patents

Abstract

The present invention relates to a fiber sheet and a reinforcing panel for a concrete structure and a structure repair and reinforcing method using the same, and more specifically to a fiber sheet manufactured by impregnating a fiber sheet with an impregnating agent (a reinforcing agent) such as an epoxy resin, and a method for repairing and reinforcing a structure by using a reinforcing panel manufactured using the fiber sheet in structurally repairing and reinforcing concrete structures such as beams, slabs, and columns. Therefore, the shrinkage of a thermosetting resin and a room temperature curable resin provided as a fiber sheet can be controlled so that reliable construction can be performed during repair and reinforcement construction, in forming a reinforcing panel by forming repairing and reinforcing fiber sheets by impregnating reinforced fiber sheets formed of glass fibers, carbon fibers, aramid fibers, and ceramic fibers, and by stacking the repairing and reinforcing fiber sheets. In addition, as the physical properties of the reinforcing fiber sheets formed of glass fibers are excellent, a repairing effect including extension of the repair and reinforcement life can be increased, in the repair and reinforcing construction of a concrete structure using the reinforcing panel manufactured from the reinforcing fiber sheets.

Description

Textile sheet and reinforcement panel for concrete structure and method of repair and reinforcement method of structure using the same}

The present invention relates to a fiber sheet and a reinforcing panel for a concrete structure, and a repair and reinforcement method of a structure using the same, and more particularly, in the structural repair and reinforcement of concrete structures such as beams, slabs, columns, etc. It relates to a method of repairing and reinforcing a structure by using a fiber sheet manufactured by impregnating the impregnating agent (reinforcing agent) of and a reinforcing panel manufactured using the fiber sheet.

In general, fiber sheets or reinforcing panels required for repair and reinforcement in the fields of construction, civil engineering, shipbuilding, aviation, etc.are collectively referred to as fiber sheets that improve mechanical strength by mixing fiber materials in synthetic resin, and reinforcing panels manufactured using the fiber sheets. In addition, the fiber sheet is generally made of a composite material of glass fiber, carbon fiber, and aramid fiber, and is used in the form of a sheet itself or a laminated panel.

Among these reinforcing fiber sheets, a sheet or panel made of glass fiber is economical, has strong impact and has a very high tensile strength, and a sheet or panel made of carbon fiber has high tensile strength and tensile elasticity, and is made of aramid fiber. In the case of fabrication, the tensile strength and tensile elasticity are lower than that of glass fiber and carbon fiber, but the impact strength is high, the wear resistance is strong, the resistance to breaking is high, and the vibration damping effect is greater than that of carbon fiber.

Fiber sheets for manufacturing the above-described panels are molded using a one-way prepreg or pultruded using carbon filaments. In the case of manufacturing by conventional one-way prepreg or pultrusion molding, it has a strong force in the fiber length direction, but has a relatively weak force because it is only bonded by resin bonding in a perpendicular direction. Therefore, a reinforcing material having excellent tensile strength not only in the fiber length direction but also in the perpendicular direction is manufactured by woven fibers into a fabric form and impregnated with synthetic resin.

Conventionally, in the process of attaching a fiber sheet or panel to a concrete structure, an impregnant is applied to the fiber sheet and then attached to the concrete structure, and then the fiber sheet is pressed with a roller to discharge air inside the fiber sheet to improve adhesion. You will improve your support. However, there is a cumbersome problem in that the worker must adhere to the concrete structure after applying the impregnating agent to the fiber sheet one by one in the field, and there is a problem that the work process is delayed due to this.

Recently, in order to solve this problem, as in Korean Patent Application No. 10-2010-0059003, the fiber sheet was previously impregnated into a tank filled with an impregnating agent, and the internal air of the fiber sheet was removed by pressure and then attached to the concrete structure. Technology has been developed and used. However, in the recent fiber sheet impregnation technology, the impregnant is circulated through the storage chamber and the circulation line and supplied to the tank. In this process, the impregnant made of epoxy and the curing agent hardens and gradually accumulates on the inner wall of the storage chamber and the circulation line. There is a problem that maintenance needs to be performed, and there is a problem that the replacement cycle of the storage chamber and circulation line is accelerated due to corrosion due to hardening, resulting in an increase in production cost.

The above-described invention refers to the background art of the technical field to which the present invention belongs, and does not mean the prior art.

The present invention was conceived to solve the above-described conventional problems, and an object of the present invention is to impregnate a fiber sheet to form a reinforcing panel, which is a repair and reinforcement material, a thermosetting resin and a room temperature curable resin provided as an impregnating agent for a fiber sheet. To provide a method of manufacturing a low-shrink impregnated fiber sheet to perform stable repair and reinforcement work by controlling the shrinkage in, and applying it to repair and reinforcement of a concrete structure using a reinforcing panel manufactured using the fiber sheet. For.

In order to achieve the above object, the present invention

A first step of arranging the background surface;

A second step of drilling an anchor hole for installing a fiber anchor;

A third step of applying an adhesive resin on the upper surface of the base surface; And

A fourth step of attaching a reinforcing panel using a low shrinkage type fiber sheet to a base surface coated with the adhesive resin using a fiber anchor; As a concrete structure repair and reinforcement method comprising a,

The reinforcing panel using the low shrinkage fiber sheet

As a reinforcing panel formed by laminating a low-shrink type fiber sheet formed by impregnating a fiber sheet with an impregnating resin composition formed by mixing 100 parts by weight of an impregnating resin, 50 to 300 parts by weight of a shrinkage reducing agent, and 8 to 12 parts of a hardener,

The impregnating resin is characterized in that it is a thermosetting resin or room temperature curable resin,

The shrinkage reducing agent is a granular polystyrene resin dissolved in a styrene monomer as a catalyst, and dissolved by mixing 30 to 40 parts by weight of a polystyrene resin and 60 to 70 parts by weight of a styrene monomer, and 1 to 10 parts by weight of aluminum hydroxide powder and magnesium silicate powder. It provides a repair and reinforcement method for concrete structures, characterized in that it further comprises 0.1 to 5 parts by weight.

In an embodiment of the present invention, the impregnating resin composition further comprises a functional filler made of a mixture of silica powder and expandable graphite.

In addition, in one embodiment of the present invention, the room temperature curable resin is characterized in that it is made of an epoxy resin, a first liquid containing a urethane resin, and a second liquid containing an acrylic resin.

In addition, in an embodiment of the present invention, in the fourth step, the reinforcing panel is attached to the target base surface and compressed evenly, and the reinforcing panel is fastened to the top of the reinforcing panel through an adhesive resin. It is characterized in that it is fastened to the base surface.

In addition, in one embodiment of the present invention, after the fourth step, the construction completion work is performed, but when the reinforcing panel is installed in an area where the outside of the reinforcing panel requires acid resistance, an acid-resistant paint is applied, and acid resistance is not required. A fifth step of applying a paint suitable for performance and arranging the surroundings by applying a surface protection coating agent in the case of an area; It characterized in that it further comprises.

According to the present invention, in forming a fiber sheet for repair and reinforcement by impregnating a reinforcing fiber sheet such as glass fiber, carbon fiber, aramid fiber, and ceramic fiber, and laminating it to form a reinforcing panel, a thermosetting resin provided as a fiber sheet and In the room temperature curable resin, the shrinkage can be adjusted so that stable construction can be performed during repair and reinforcement construction.

In addition, according to the present invention, since the physical properties of the reinforcing fiber sheet such as glass fiber are excellent, it is possible to extend the repair and reinforcement life in the repair and reinforcement construction of a concrete structure using a reinforcing panel manufactured therefrom. There is an advantage that can be increased.

Hereinafter, a preferred embodiment of the concrete structure repair and reinforcement technology according to the present invention will be described. Terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of users or operators. Therefore, definitions of these terms should be made based on the contents throughout the present specification.

In addition, the following examples are not intended to limit the scope of the present invention, but are presented merely as examples, and there may be various embodiments implemented through the spirit of the present technology.

The repair and reinforcement method of a concrete structure according to the present invention proceeds in the following order. In other words

A first step of arranging the background surface;

A second step of drilling an anchor hole for installing a fiber anchor;

A third step of applying an adhesive resin on the upper surface of the base surface; And

A fourth step of attaching a reinforcing panel using a low shrinkage type fiber sheet to a base surface coated with the adhesive resin using a fiber anchor; Consists of including.

Hereinafter, each of the above steps will be described in detail.

First, arrange the background surface. In other words, it is desirable that the base surface should be sufficiently cured and dried, and measures should be taken so that there are no foreign substances or other obstacles to attachment to the surface. If surface chipping is necessary, remove the damaged part and remove foreign substances on the surface.

Thereafter, an anchor hole for installing the fiber anchor is drilled.

Specifically, it is preferable to use an electric drill to perforate the anchor hole while maintaining it vertically, and to completely remove internal dust and foreign matters caused by the perforation. Thereafter, an adhesive resin is applied.

It is preferable to sufficiently mix and mix the main material and the curing agent in a prescribed formulation, and evenly apply the resin to the base surface to be adhered to the impregnated fiber sheet with a thickness of 2 to 5 mm so that the smoothness is maintained.

Thereafter, the reinforcing panel formed using the fiber sheet is attached to the base surface coated with the adhesive resin.

That is, the reinforcing panel is attached to the base surface to be repaired and reinforced, and compressed evenly, removing air bubbles, and then curing. On the other hand, if the attachment length is insufficient by using a fiber anchor if necessary, it can be secured and used to increase adhesion.Some of the fiber anchors are inserted and filled with epoxy filling, and the remaining parts are radially spread out and covered with a fiber sheet to finish. have.

A reinforcing panel formed using the fiber sheet will be described later.

Thereafter, curing and coating of a sealing agent are performed on the fiber-finished area.

At this time, after curing, an acid-resistant paint or a protective coating may be applied to the surface of the glass fiber sheet.

After that, the construction completion work is performed. That is, when a reinforcing panel is installed in an area requiring acid resistance, it is preferable to apply an acid-resistant paint, and when an area where acid resistance is not required, apply a surface protection coating agent, etc.

Hereinafter, a reinforcing panel formed using the fiber sheet according to the present invention will be described.

As the fiber sheet, reinforcing fibers such as glass fiber, carbon fiber, aramid fiber, ceramic fiber, and basalt fiber may be used, and other synthetic fiber sheets such as nylon and polyester may be used. It is preferably glass fiber.

The fiber sheet according to the present invention is characterized in that it is formed by impregnating the fiber sheet with an impregnated resin composition formed by mixing 100 parts by weight of an impregnating resin, 50 to 300 parts by weight of a shrinkage reducing agent, and 8 to 12 parts of a curing agent.

The impregnating resin is characterized in that it is a thermosetting resin or room temperature curable resin.

The shrinkage reducing agent is a granular polystyrene resin dissolved in a styrene monomer as a catalyst, and dissolved by mixing 30 to 40 parts by weight of a polystyrene resin and 60 to 70 parts by weight of a styrene monomer, and 1 to 10 parts by weight of aluminum hydroxide powder and magnesium silicate powder. It is characterized in that it further comprises 0.1 to 5 parts by weight.

In the present invention, the curing shrinkage of the "thermosetting resin" such as an unsaturated polyester resin and an acrylic and urethane-based "room temperature curable resin" reaches a certain state quickly with an increase in the amount of the curing accelerator and catalyst, and the value is 3.5/1000 To 5.5/1000.

In order to compensate for this, it is important to reduce the amount of resin added as much as possible.However, due to the nature of products that need to be impregnated with resin, reducing the amount of resin may lead to quality deterioration, and there is a concern about uncuring, which is not an appropriate solution. .

Accordingly, in order to reduce fundamental shrinkage and manufacture a high-quality fiber sheet, the present invention is characterized by using a "shrinkage reducing agent" for the impregnated resin.

The "shrinkage reducing agent" used in the present invention fills the part where shrinkage occurs when the impregnated resin is crosslinked, thereby preserving the shrinked part of the resin, so that uniform performance can always be expected.

That is, by mixing a shrinkage reducing agent into the impregnated resin, it is possible to reduce the shrinkage rate of the fiber sheet and provide a stable impregnated fiber sheet.

However, if the shrinkage reducing agent is used more than necessary, it is desirable to appropriately determine the amount of the impregnated fiber sheet, since it may cause a decrease in physical properties.

The shrinkage reducing agent to be used in the present invention is used in which granular "polystyrene" is dissolved in "styrene monomer", which is an impregnating resin catalyst, and additionally, aluminum hydroxide powder and magnesium silicate powder are used.

In the shrinkage reducing agent intended to be used in the contents of this patent (low shrinkage impregnated fiber sheet), the weight ratio of polystyrene (preferably, weight average molecular weight of 10,000 to 200,000) and styrene monomer is 30 to 40 parts by weight of polystyrene resin and 60 to 70 parts by weight of styrene monomer. It is preferable to mix and dissolve in parts by weight.

In the present invention, when 100 parts by weight of an impregnating resin, 50 to 300 parts by weight of a shrinkage reducing agent, and 8 to 12 parts of a curing agent are mixed and used, the curing shrinkage ratio (less than 3.5/1000) and workability are required compared to when the shrinkage reducing agent is not used. It can be seen that all of the time is satisfied, and it can be used stably in the field.

In the present invention, the aluminum hydroxide powder contained in the shrinkage reducing agent absorbs heat during the reaction and thus serves as an auxiliary function in reducing shrinkage. The aluminum hydroxide is preferably contained in the range of about 1 to 10 parts by weight in the shrinkage reducing agent. If the amount of aluminum hydroxide is less than 1 part by weight, heat absorption performance is insufficient, so that it is difficult to exhibit the function as a shrinkage reducing agent, and if it exceeds 10 parts by weight, it is possible to hinder the function of the resin, and thus it is preferable to be included within the above range.

In addition, in the present invention, the magnesium silicate powder contained in the shrinkage reducing agent serves to reduce a problem in which the amount of air increases during drying and shrinkage, resulting in a decrease in strength. The magnesium silicate is preferably contained in the range of about 0.1 to 5 parts by weight in the shrinkage reducing agent. If the magnesium silicate is less than 0.1 part by weight, the strength reduction reduction effect is insufficient, and if it exceeds 5 parts by weight, it is possible to hinder the functioning of the resin, and thus it is preferable to be included within the above range.

In the present invention, it is preferable to use an amine-based curing agent as the curing agent, but is not limited thereto.

In the present invention, the impregnated resin may be varied depending on the range of repair and hardening method.

In addition, in the present invention, the impregnating resin composition may further include a functional filler.

As the functional filler, a mixture of silica powder and expandable graphite may be used.

As the silica powder, one or a mixture of two or more selected from colloidal silica, fumed silica, and micronized silica may be used.

The functional filler serves to further increase the binding effect, thereby increasing the repair effect. In the present invention, the mixing ratio of the silica powder and the expandable graphite is preferably mixed in a weight ratio of 100:50 to 200.

In addition, when using the functional filler, it is possible to use the powder directly, but by treating the surface and coating it with an organosilane, it is possible to increase the durability due to the increase of the binding effect.

That is, the silica powder alone or a mixture of expandable graphite powder can be treated by dispersing a colloidal solution in a solvent in an organic silane and stirring for about 1 to 10 hours. Specifically, about 0.1 to 50 parts by weight of an organic silane is added to the solution based on 100 parts by weight of a silica powder alone or a mixture solution of expandable graphite powder to form an organic group on the surface of the powder particles in the solution and pass through the reactor to dehydration and condensation reactions. Through the organic group to form a surface-treated powder. In this case, the solution is that silica powder or expandable graphite powder is dispersed in a colloidal state in a solvent such as water or alcohol, and it is preferable to contact the organic silane in a colloidal solution state.

Specific examples of the organosilane include dimethyldimethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, and tetraethoxysilane. At this time, treating the powder surface with organic silane is formed by stirring at room temperature for about 1 to 10 hours to form an inorganic substance having an organic group and passing it through a reactor. In this case, the reactor is a heating device, and the temperature is raised to 100 to 300° C. to dehydrate and condensate the inorganic material having a solvent and an organic group formed thereon for 1 to 10 hours to prepare powdery inorganic particles having a surface treatment.

The silica powder and the expandable graphite powder prepared as described above have excellent binding effects because silane is formed on the surface thereof, and thus durability may be further improved.

In the present invention, the functional filler is preferably included in the range of 1 to 10 parts by weight based on 100 parts by weight of the impregnating resin composition.

In the present invention, the fiber sheet may be manufactured using a general resin impregnation device. The fiber sheet manufactured by the above method may form a reinforcing panel by laminating a plurality of layers and bonding them by a heating and pressing method. In this case, the stacking of the plurality of fiber sheets is preferably in a form in which the direction is stacked in a cross shape, and it is possible to use other stacked in a diagonal direction.

In addition, the thickness of the reinforcing panel can be used after manufacturing by adjusting the required thickness according to the site conditions.

On the other hand, in performing the above construction completion work, if a reinforcing panel is installed in an area where acid resistance is required, an acid-resistant paint is applied, and in the case where an acid resistance is not required, a surface protection coating is applied. I can.

In the present invention, the acid-resistant paint is a chemical substance for imparting protection, beautification, and other special functions to the reinforcing panel itself or the upper surface coated with a protective coating agent on the reinforcing panel as described above, epichlorohydrin and bisphenol-A. By using an epoxy-based polymer compound obtained by condensation reaction, it has excellent chemical resistance, excellent chemical resistance, alkali resistance, and water resistance, and especially secures strong resistance to acids, requiring underground structures, wastewater treatment plants, chemical plants, and acid resistance and chemical resistance. You can make it suitable where you do it.

In another embodiment of the present invention, the acid-resistant paint is 23 to 25 parts by weight of an epoxy-based polymer compound, 5 to 7 parts by weight of a TPU resin, 1 to 2 parts by weight of a flame retardant, and 1 to 2 parts by weight of a crosslinking agent based on 100 parts by weight of the flame-retardant silicone adhesive. It may be formed by including a subject made of part and a curing agent.

In the present invention, the curing agent is preferably formed by mixing an alicyclic amine-based curing agent, an aliphatic amine-based curing agent, an aromatic amine-based curing agent, an acid anhydride-based curing agent, and an imidazole-based curing agent.

The subject consisting of flame retardant silicone adhesive, epoxy resin, TPU resin, flame retardant, and crosslinking agent can have both flame retardance and acid resistance.

Here, when the amount is less than 23 parts by weight of the epoxy-based polymer compound as a raw material, the acid resistance characteristics are significantly reduced, and when it exceeds 25 parts by weight, it is difficult to make the acid-resistant paint liquid.

In addition, the epoxy-based polymer compound as a raw material has excellent mechanical strength and abrasion resistance, and has excellent properties in terms of insulation, bending resistance, and colorability.

In addition, TPU resin as a raw material is a thermoplastic polyurethane (TPU), a rubbery elastic body having a urethane group (-NHCOO-), which has excellent mechanical strength and abrasion resistance, and has excellent properties in terms of insulation, bending resistance, and coloring properties. Has. TPU is a non-PVC-based thermoplastic resin, which is harmless to the human body because there is no risk of generating harmful compounds, and it is environmentally friendly because it does not emit air or soil pollutants when incinerated.

Here, when the amount is less than 5 parts by weight of the TPU resin with respect to 100 parts by weight of the flame-retardant silicone adhesive, mechanical strength and abrasion resistance are significantly reduced, and when it is more than 7 parts by weight, the flexibility as a surface member is significantly lowered.

The flame retardant is a mixture of antimony molybdate, molybdenum oxide, magnesium hydroxide and aluminum hydroxide powder. In particular, aluminum hydroxide (Al(OH) ₃ ) is converted into activated alumina when it reaches 500℃ or higher due to heat applied to the reinforcing panel and has adsorption performance, so it adsorbs harmful substances such as dioxin and hydrogen chloride gas (HCl) generated during combustion. During thermal decomposition, it has an endothermic reaction, so that it has a cooling effect, and is non-flammable, so that it has excellent water and acid resistance, and it is expected to improve the flame retardant effect by using a combination of flame retardants. If the flame retardant is less than 1 part by weight based on 100 parts by weight of the flame-retardant silicone adhesive solution, it is difficult to expect flame-retardant performance, and if it exceeds 2 parts by weight, the content of the epoxy resin and TPU resin is relatively low, resulting in a problem that the acid resistance is deteriorated.

When the crosslinking agent is less than 1 part by weight based on 100 parts by weight of the flame-retardant silicone adhesive, it cannot function as a crosslinking agent, and when it is larger than 2 parts by weight, excessive crosslinking reaction occurs.

In addition, the curing agent may be an amine-based curing agent, and it is preferable to include 11 to 16 parts by weight based on 100 parts by weight of the base material, and when the curing agent is less than 11 parts by weight, the base material can be cured enough to be used as an acid-resistant paint in the present invention. If it exceeds 16 parts by weight, there is a problem that the curing reaction occurs excessively and the viscosity of the acid-resistant paint is deteriorated.

In the above, a fiber sheet and a reinforcing panel for a concrete structure according to an embodiment of the present invention, and a repair and reinforcement method for a structure using the same have been described in detail.

One embodiment of the present invention described above is merely exemplary, and those of ordinary skill in the art to which the present invention belongs will appreciate that various modifications and other equivalent embodiments are possible. . Therefore, it will be appreciated that the present invention is not limited to the form mentioned in the detailed description above. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims. In addition, the present invention is to be understood as including the spirit of the present invention as defined by the appended claims and all modifications, equivalents and substitutes within the scope thereof.

Claims (5)

A first step of arranging the background surface;
A second step of drilling an anchor hole for installing a fiber anchor;
A third step of applying an adhesive resin on the upper surface of the base surface; And
A fourth step of attaching a reinforcing panel using a low shrinkage type fiber sheet to a base surface coated with the adhesive resin using a fiber anchor; As a concrete structure repair and reinforcement method comprising a,
The reinforcing panel using the low shrinkage fiber sheet
As a reinforcing panel formed by laminating a low-shrink type fiber sheet formed by impregnating a fiber sheet with an impregnating resin composition formed by mixing 100 parts by weight of an impregnating resin, 50 to 300 parts by weight of a shrinkage reducing agent, and 8 to 12 parts of a hardener,
The impregnating resin is characterized in that it is a thermosetting resin or room temperature curable resin,
The shrinkage reducing agent is a granular polystyrene resin dissolved in a styrene monomer as a catalyst, and dissolved by mixing 30 to 40 parts by weight of a polystyrene resin and 60 to 70 parts by weight of a styrene monomer, and 1 to 10 parts by weight of aluminum hydroxide powder and magnesium silicate powder. It is characterized in that it further comprises 0.1 to 5 parts by weight,
It characterized in that it further comprises a functional filler made of a mixture of silica powder and expandable graphite to the impregnating resin composition,
The room temperature curable resin is characterized in that consisting of a first liquid containing an epoxy resin, a urethane resin and a second liquid containing an acrylic resin,
In the fourth step, the reinforcing panel is fastened to the base surface through an adhesive resin by attaching the reinforcing panel to the target base surface and compressing it evenly, and fastening the fiber anchor to the upper part of the reinforcing panel.
Perform the construction completion work after the fourth step, but if the reinforcement panel is installed in an area where acid resistance is required outside of the reinforcement panel, an acid-resistant paint is applied, and in the case where the acid resistance is not required, a surface protective coating is applied. A fifth step of applying a suitable paint and cleaning the surrounding area; It characterized in that it further comprises,
The acid-resistant paint is used on the reinforcing panel itself using the low-shrink-type fiber sheet or the upper surface coated with a protective coating agent firstly on the reinforcing panel using the low-shrink-type fiber sheet, and epoxy based on 100 parts by weight of the flame-retardant silicone adhesive solution. It is characterized in that it is formed including a main material and a curing agent consisting of 23 to 25 parts by weight of a polymer compound, 5 to 7 parts by weight of a thermoplastic polyurethane (TPU), 1 to 2 parts by weight of a flame retardant, and 1 to 2 parts by weight of a crosslinking agent,
The flame retardant is an antimony molybdate, molybdenum oxide, magnesium hydroxide, and a mixture of aluminum hydroxide powder in one or two or more mixtures selected from the method of repairing and reinforcing concrete structures. delete delete delete delete