KR101223019B1 - A complex pannel and method of construction of concrete structure for usein such pannel - Google Patents

Abstract

PURPOSE: A composite panel and a repair and reinforcement method for a structure using the same are provided to extend the service life of a structure and to reduce maintenance costs. CONSTITUTION: A composite panel(100) comprises a resin mixture layer(102) and a unidirectional fiber sheet or bidirectional fiber sheet(106) for reinforcement. The resin mixture layer is composed of a resin mixture. The resin mixture is produced by mixing 25-30 wt% of liquid epoxy resin, 1-3 wt% of cement, 54-68 wt% of silica, 5-10 wt% of reinforcing fiber chip, and 1-3 wt% of steel fiber chop and putting the mixture into a mold(M). The unidirectional fiber sheet or bidirectional fiber sheet is put into the resin mixture before the resin mixture layer is hardened.

Description

A Complex Pannel And Method of Construction of Concrete Structure For usein such Pannel}

The present invention relates to a composite panel for repairing and reinforcing steel structures exposed to various concrete structures and seas, and repair and reinforcement methods using the same.

In particular, it is produced by laminating and impregnating a resin mixture containing a steel fiber (Chop form) and a fiber paper having excellent tensile strength, and installing it on-site to enhance durability and maintain the structure. The present invention relates to a composite panel and a repair reinforcing method using the same, which can achieve cost savings.

In general, concrete structures are excellent in durability, accounting for more than 90% of the entire facility, but neutralization, cracking, and reinforcing corrosion are progressing according to environmental factors (eg sulfur dioxide, chloride, hydrogen sulfide, sea salt, carbon dioxide, etc.). As a result, concrete structures are being dismantled and maintenance costs are incurred every year.

The reason that concrete structures do not reach their lifespan is the main cause of deterioration of durability. Materials and construction contribute to increasing the durability of the structure due to the development of technology, but it is not only large in industrial development but also in traffic volume, large bridges, power plants, etc. It is emerging as an influencing factor, and the reinforcement of repairs is urgently needed as the cost of reconstruction is large.

Looking at the repair and reinforcement method of the existing concrete structure, there are largely the cross-sectional augmentation method using the mortar on the member, reinforcing fiber attachment method, panel bonding method.

The cross-sectional enlargement method using mortar increases the stress generated by the structure itself by increasing its own weight from the moment of completion of construction, and there is a considerable problem in the adhesion due to problems such as dropping and peeling over time in terms of attachment with existing concrete. Is occurring.

In addition, the reinforcing fiber attachment method is a method of increasing the tensile strength by only attaching to the surface of the structure without considering the cracks, peeling, white flakes and other damage of the cross-section in the concrete structure. For this reason, the design calculations must be performed in parallel with the above factors, which leads to an increase in the budget, and it is difficult to apply the design when the cross-section is not flat or the damage is small. The dew condensation causes serious problems on the attachment surface.

On the other hand, the panel bonding method was initiated in the iron plate adhesive injection method, but due to the corrosion of the iron plate itself rather damaging the structure is not currently used. Recently, the method of repairing and reinforcing the structure by manufacturing panels using epoxy resin instead of iron plate is widely used. However, the existing panels are manufactured by extruding in one direction when manufacturing. The current concrete structure is composed of slabs, girders, and columns. Due to the different dynamic force behaviors, consideration should be given to the fabrication of panels with bidirectionality. In particular, in the case of port structures, since all structures are bidirectional, it is necessary to consider installation of panels in both directions.

On the other hand, to solve the problem in the iron plate panel as described above, as confirmed in the following patent document, a reinforcement panel is used. However, in manufacturing the reinforcing panel, skill is required in mixing (mixing) the reinforcing fibers and the epoxy resin, and there is a high possibility of including bubbles in the panel even in the small process error caused by mixing and external environment. This problem may appear to be a problem that the reinforcement performance may be different for each site when the panel is installed in the field, and the joints are inevitably generated in the panel and the panel depending on the extent of the crack area of the structure during the site construction. In addition, these joints are caused by the resin pressure to be injected or cause problems such as torsion, spreading, dropping, etc., depending on the construction skill. In addition, there is a problem in that the secondary hole of the joint portion does not function properly for the basic deflection and tensile stress of the reinforcement panel.

Therefore, there is an urgent need for a composite panel having improved these problems and a repair reinforcement method using the same.

1. Domestic Patent Registration No. 10-310016, Manufacturing method of fiber reinforced epoxy resin panel.

An object of the present invention, which was developed to solve the above problems, by mixing the steel fiber chop (Chop) in the resin blend to produce a one-way or two-way reinforcing fiber according to the application structure, this site When applied to the construction, it has the characteristics to overcome the impact resistance, toughness and brittleness, and also causes quality deterioration even if there are some differences in the physical properties including bubbles due to the process error during the manufacturing of the composite panel. The present invention provides a composite panel and a reinforcing reinforcement method for concrete structures using the same.

In addition, the joints, which are inevitably generated according to the width of the structure during construction, further increase the unity between panels by reinforcing fiber parts reinforced inside and outside. It is to provide a repair panel reinforcement method of the composite panel and concrete structure using the same to ensure the quality.

The composite panel of the present invention for achieving the above object, in the composite resin panel of claim 1, 25-30% by weight of epoxy resin, 1-3% by weight of cement, 54-68% by weight of silica, reinforcement A resin mixture layer obtained by curing a resin mixture made by mixing 5-10 wt% of fiber hops and 1-3 wt% of steel fiber Chop with each other in a mold; And unidirectional or bidirectional reinforcing fibrous paper made of any one of aramid fibers, carbon fibers, glass fibers, and fiber roving cloths, which are impregnated at a distance from the top and the bottom of the resin mixture so as to be integrated with the resin mixture layer. It is characterized by including.

The repair reinforcement method of the concrete structure using the composite panel of the present invention for achieving the above object, in the method of repairing and reinforcing by injecting epoxy resin into the crack portion of the structure of claim 2, the composite produced by claim 1 Fixing a resin plate to face the cracked surface of the structure, and joining the composite resin plate to form a joint according to the size of the structure; Prior to reinforcing the crack by injecting the epoxy resin between the composite resin panels and the structure, the composite resin may be fixedly positioned inside the joint part in one direction or bidirectional reinforcing fiber paper corresponding to the full length of the joint part. A first fiber reinforcing step of reinforcing the inner side of the joint portion such as the epoxy resin injected between the panels and the structure; Reinforcing joints having grooves formed along the entire length of the joints on the outer side of the joints, and fixing joints of the same material as the composite resin panel to form a horizontal plane inside the grooves to reinforce the outside of the joints. Plate reinforcement step; And one-way or two-way reinforcing fiber paper such as the reinforcing fiber formed corresponding to the entire length of the reinforcing joint plate to cover all of the joint plate and a part of the composite resin panel, and then apply the epoxy resin several times. It is characterized in that it comprises a second fiber reinforcing step to be fixed to the panel by reinforcing the outside of the joint.

The unidirectional reinforcing fiber paper and bidirectional reinforcing fiber paper is any one selected from glass fiber, carbon fiber, and aramid fiber, and the bidirectional reinforcing fiber paper is a fiber roving cloth. It is characterized by the).

The present invention has an effect that can be overcome in impact resistance, toughness and brittleness by using a composite panel made of steel fibers and one or two-way reinforcing fiber paper in the epoxy resin to reinforce the structure. When manufacturing composite panels, even if there are some differences in the physical properties including bubbles due to the process mistake, there is an effect that can prevent the deterioration of quality. By manufacturing the directional panels suitable for the site, the cost loss due to overdesign There is an effect that can be saved.

In addition, the joints, which are inevitably generated according to the width of the structure during construction, further increase the unity between panels by reinforcing fiber parts reinforced inside and outside. To ensure the quality.

1 is a view schematically showing a manufacturing process of a composite panel according to the present invention,
Figure 2a, Figure 2b is a view showing the one-way and two-way reinforcing fibers, respectively used in the manufacture of the composite panel of Figure 1,
3 is a view showing a method for repairing and reinforcing using the composite panel according to the present invention in the cracked portion of the concrete structure,
4 is a cross-sectional view taken along line II of FIG. 3.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the repair panel reinforcement method of the composite panel according to the present invention and the structure using the same.

1 is a view schematically showing the manufacturing process of the composite panel according to the present invention, and Figures 2a, 2b is a view showing one-way and two-way reinforcing fiber paper (纖維 地) used in the production of the composite panel of Figure 1, respectively to be.

As shown in the drawing, the composite panel 100 according to the present invention is a liquid epoxy resin 25-30% by weight, cement 1-3% by weight, silica 54-68% by weight, reinforcing fiber chips (Chop) 5-10 wt% of the steel fiber and 1 to 3 wt% of steel fiber Chop are mixed with each other, followed by pouring the resin mixture layer 102 into a prepared mold M and Before the resin mixture layer 102 is cured, the resin mixture layer 102 is made of a reinforcing unidirectional fibrous paper 104 or a bidirectional fibrous paper 106 which is laminated so as to be impregnated with the resin mixture so as to be integrated as a resin mixture.

The reason for limiting the epoxy resin to 25 to 30% by weight is to maintain the bonding strength of the materials to be added together, and to maintain the cement at 1 to 3% by weight to increase the strength of the composite panel resin, Maintaining the silica at 54 to 68% by weight is to reduce the amount of cement generating harmful components to make an eco-friendly product, but to make up for the lack of cement so as not to reduce the strength, and to reinforce the fiber. Chop) is maintained at 5-10% by weight and steel fiber chop at 1-3% by weight, which increases the bond strength that unites the materials, making it impossible to obtain when using cement or silica. This is to further improve the bending strength and tensile strength.

Referring to the manufacturing process of the resin composite panel 100 according to the present invention configured as described above, while supplying a resin mixture blended and weighed as described above to the inside of the prepared mold (M), before the resin mixture is cured The one-way fiber paper 104 or the bidirectional fiber paper 106 for reinforcement as shown in FIG. 2 cut to size is positioned so as to be stacked at a distance from the top and the bottom to be impregnated with the resin. When the supply of the resin mixture is completed into the mold M such that the reinforcing unidirectional fibrous paper 104 or the bidirectional fiber paper 106 is completely impregnated with the resin mixture, the mold M is subjected to curing for a predetermined time. After demolding from) through a curing operation for about 0.5 to 1 days at room temperature with good ventilation to produce the final resin composite panel 100. The size of the resin composite panel 100 is not specifically determined, and may be manufactured and supplied in any size according to the application condition of the site.

The reinforcing fiber papers 104 and 106 may be composed of one-way fiber paper 104 or two-way fiber paper 106, or both upper and lower, or one-way fiber paper 104 on the upper portion of the mixed form and The lower portion may be configured to be disposed bidirectional fiber paper 106 or vice versa. Such a configuration is to predict and selectively produce according to the reinforcement direction of the site structure in advance, it is possible to reduce the budget according to the existing fructose reinforcement design.

In addition, the fiber used in the one-way or bi-directional fiber paper 104, 106 is any one of aramid fiber, carbon fiber, glass fiber, bi-directional fiber paper 106 is a fiber roving cloth weaving the fiber horizontally, vertically.

As a result of the measurement of the compressive strength, tensile strength, shear strength and bending strength of the composite resin panel 100 according to the present invention, the compressive strength is 800 kg / ㎠ or more, tensile strength is 100 0kg / ㎠ or more, bending flexural strength Was found to be more than 400 kg / ㎠. This strength was found to be superior to the strengths of conventional fiber reinforced epoxy panels. In addition, the weather resistance test during winter season was hardly affected by climatic conditions such as temperature and humidity, and the chemical resistance was also resistant to acids and alkalis such as hydrochloric acid, sulfuric acid, and sodium hydroxide. It can be seen that it can be used more effectively in concrete structures, steel structures, or underwater concrete structures that are attacked by exhaust gas. In addition, if necessary, a flame retardant effect can be expected by adding a flame retardant to prevent fire.

3 is a view showing a repair and reinforcement method using the composite panel according to the present invention in the cracked portion of the concrete structure, Figure 4 is a cross-sectional view taken along the line I-I of FIG.

The resin composite panel 100 of FIG. 1 manufactured as described above is used to maintain a steel pile and a steel pipe method used in concrete structures or ports and at sea (here, the method is referred to as metal). It can be used to repair and reinforce the cracks of other materials (or materials) so that the surface does not come into contact with corrosive materials and prevent erosion. An example of the case of reinforcement will be described with reference to FIGS. 3 and 4.

First, the pre-treatment work to finish the flat surface by injecting the epoxy resin prepared in advance to the crack (C) of the concrete structure to be repaired and reinforced.

<Step of installing composite resin panel forming joints>

When the pretreatment work on the cracked surface (C) of the construction surface to be repaired and reinforced is completed, the steel fiber chop (Chop) is added to the liquid resin mortar, and then mixed and manufactured to contain existing defective bubbles. Compared to the existing resin panel with the improved physical properties of the composite resin panels 100 of the present invention, the shock absorption capacity is increased and fixed so as not to move. The positioning method fixes the composite resin panel 100 having a predetermined width in a state of facing the surface having the crack portion C of the structure. At this time, fixing the composite resin panel 100 as a bolt after the position at a slight distance from the corresponding surface of the crack site (C) to repair and reinforce, this fixing method is a very general technique, so as a separate remedy Description is omitted. The reason why the composite resin panel 100 is fixed at a slight distance from the corresponding surface of the crack site C to be repaired and reinforced is between the composite resin panel 100 and the crack site C to be repaired and reinforced. In order to inject the epoxy resin (E), the epoxy resin (E) is more than the composite resin panel 100 so that the composite resin panel 100 does not fall from the repair and reinforcement surface with the cracked portion of the structure (1). This is to firmly repair and reinforce the crack part (C) of the structure because it is strongly attached. Therefore, the physical properties of the epoxy resin (E) used to attach the composite resin panel 100 must satisfy the tensile strength of 500kgf / ㎠ or more, compressive strength 800kgf / ㎠ or more, bending flexural strength 800kgf / ㎠ or more, adhesion strength 20kgf / ㎠ or more It is.

<1st fiber reinforcement stage>

According to the size of the crete structure (1), two or more composite resin panels 100 are inevitably formed with a joint (4). The joint 4 must be reinforced because it may be a weak part in the composite resin panel 100.

Therefore, before the epoxy resin (E) is injected between the composite resin panel 100 and the structure 1 to attach the composite resin panel 100 to repair and reinforce the crack C, the joint part 4 ), The one-way reinforcing fibrous paper 104 or the bidirectional reinforcing fibrous paper 106 corresponding to the entire length of the joint part 4 is attached in a state in which the joint part 4 is covered inside the joint part 4. Attachment of the unidirectional reinforcing fibrous paper 104 or the bidirectional reinforcing fibrous paper 106 to the joint 4 is fixed by an epoxy resin, which is impregnated with the epoxy resin and then taken out and attached to the joint paper. It is firmly attached by the adhesive force. Only one directional reinforcing fiber paper 104 or bidirectional reinforcing fiber paper 106 may be attached, but if necessary, the fiber paper may be attached in layers to increase strength. After the reinforcement work by the one-way reinforcement fibrous paper 104 or the two-way reinforcement fibrous paper 106 to the joint part 4, the epoxy resin (as described above) between the composite resin panels 100 and the structure (1). The injection work of E) is carried out, and the injected epoxy resin (E) is cured and the first fiber reinforcement work is integrated with the fiber paper previously reinforced on the joint part 4.

<Installation step of the reinforcing joint plate 107 outside the joint part 4>

The groove 108 is formed along the entire length of the joint 4 on the outside of the joint 4. The groove 108 is formed in the same material as the composite resin panel 100 and is made of a thickness of 1 to 2 mm so that the reinforcing joint plate 107 positioned in the groove 108 is a composite resin panel 100. To be as horizontal as possible. The size of the groove 108 can be modified as much as the reinforcement increases. The fixing of the reinforcing joint plate 107 to the groove 108 of the joint portion 4 can be fixed using an epoxy sealing agent.

<Second fiber reinforcing step for reinforcing joint plate 107>

The joint plate 107 for reinforcement of the joint part 4 is formed corresponding to the entire length of the joint plate 107 for reinforcement, and is one-way or two-way reinforcement identical to the reinforcing fibers used in the first fiber reinforcing work. The fiber paper 104 or 106 is positioned and fixed to cover the entirety of the joint plate 107 for reinforcement of the joint portion 4 and a part of the adjacent composite resin panel 100. Since the fixing of the reinforcing fiber paper 104 or 106 impregnates the epoxy resin, and then attaches it to the reinforcing joint plate 107, the second reinforcing portion of the joint portion 4 is reinforced more firmly. Car fiber reinforcement work is completed. In the second fiber reinforcing work for the joint 4, only one directional reinforcing fiber paper 104 or two-way reinforcing fiber paper 106 may be attached, but if necessary, layered fibrous paper for strength. It can also be attached.

On the one-side reinforcement fibrous paper 104 or the bidirectional reinforcement fibrous paper 106 attached to the outside of the joint part 4, an epoxy resin is continuously applied using a roller brush to form a thick resin cured layer from external force. It is possible to form a reinforcing layer which is more resistant to the impact strength. In addition, the fiber reinforcement over the first and second joints of the joint portion can maintain the reinforcement strength semi-permanently by blocking the entry of harmful substances into the joint portion from the external environment in advance. It also eliminates problems such as twisting, flaring and dropping out of joints.

The reinforcing method can be sufficiently confirmed from the above embodiment that the smoothness on the outside can be a separate coating treatment at the finish according to the use, so that the appearance can be beautiful depending on the type of construction.

The present invention can be produced by determining the reinforcement strength in accordance with the site-applied structure to provide the utility of budget savings by overdesign. In addition, reinforcement by the first and second order of the seam provides usefulness to maintain the reinforcement of the seam semi-permanently.

In the above description, the present invention has been described through specific embodiments, but various modifications may be made to those skilled in the art by referring to and combining various features described herein. Therefore, it should be pointed out that the scope of the present invention should not be limited to the described embodiments, but should be interpreted by the appended claims.

1: concrete structure
4: Joint
100: Resin Composite Panel
104: unidirectional reinforcing fiber paper
106: bidirectional reinforcing fiber paper
108: joint groove
107: joint plate for reinforcement
C: crack
E: epoxy resin

Claims (3)

delete In the method of repairing and reinforcing by injecting epoxy resin into the crack portion of the structure,
Epoxy resin 25 ~ 30 wt%, Cement 1-3 wt%, Silica 54 ~ 68 wt%, Reinforcing fiber chop 5 ~ 10 wt% and Steel fiber chop 1 ~ 3 wt Pour a resin mixture made by mixing the mixture with each other in a mold and cured it; And the aramid fibers to be integrated with the resin mixture layer by being positioned at a distance from the top and bottom inside the resin mixture, A composite resin plate made of one or two-way reinforcing fiber paper, either carbon fiber or glass fiber, is produced, and the composite resin plate is fixed in a state facing the cracked surface of the structure, and the composite resin plate is fixed. Combining and forming joints according to the size of the structure;
Prior to reinforcing the crack by injecting the epoxy resin between the composite resin panels and the structure, the composite resin may be fixedly positioned inside the joint part in one direction or bidirectional reinforcing fiber paper corresponding to the full length of the joint part. A first fiber reinforcing step of reinforcing the inner side of the joint portion such as the epoxy resin injected between the panels and the structure;
A joint part having grooves formed along the entire length of the joint part on the outside of the joint part, and a joint part reinforcing panel, such as the composite resin panel, is fixedly arranged to form a horizontal plane inside the groove part to reinforce the outside of the joint part. Panel reinforcing step; And
After the one-way or two-way reinforcing fiber paper, such as the reinforcing fiber paper formed corresponding to the full length of the joint reinforcing panel to cover all of the reinforcing joint plate and a part of the composite resin panel, Repair and reinforcement method of a concrete structure using a composite panel comprising a second fiber reinforcement step of fixing to the panel by applying several times to reinforce the outside of the joint. The method of claim 2, wherein the unidirectional reinforcing fibrous paper and the bidirectional reinforcing fibrous paper is any one selected from glass fiber (Klass Fiber), carbon fiber (Kevlar Fiber), aramid fiber (Aramide Fiber), and the bidirectional reinforcing fibrous paper is fiber roving Repair reinforcement method of concrete structure using composite panel, characterized in that the cloth (Fiber Roving Cloth).

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