KR101553205B1 - Repair and Reinforcing methods of Concrete Structures Seismic Upgrading - Google Patents

Abstract

The present invention relates to a repairing and reinforcing method for improving the seismic performance of a concrete structure capable of being applied for not only a normal concrete structure but also a concrete structure of a water processing facility. The present invention repairs and reinforces a concrete structure through a surface cleaning step of cleaning the surface of the concrete structure composed of a circular or a rectangular concrete column, a concrete wall, and a beam and a secondary concrete column reinforcing step of reinforcing the concrete column by horizontally winding a reinforced fabric sheet impregnated into an epoxy resin in case of the circular concrete column among the concrete structure, reinforcing the concrete column by horizontally winding a reinforced fabric sheet impregnated into in an epoxy resin after fixing and joining a reinforcing material to prevent the shear failure of the reinforced fabric sheet in case of the rectangular column. Accordingly, the present invention is capable of improving the seismic performance of the concrete structure by stably repairing and reinforcing, improving a seismic reinforcement capacity by preventing a shear force of the reinforced fabric sheet with simple configuration when reinforcing a compressive force of the concrete column, and capable of being used for the water processing facility in case of using a solvent-free ceramic coating agent.

Description

Technical Field [0001] The present invention relates to a method of repairing and reinforcing concrete structures,

The present invention relates to a method for improving seismic performance of a concrete structure and a repair and reinforcement method for improving seismic performance of a concrete structure applicable to a concrete structure of a water treatment facility as well as a general concrete structure.

In general, civil engineering and architectural structures with various shapes are suddenly collapsed due to lack of earthquake resistance, and damage to life and property is repeated all over the world.

The disintegration of civil engineering and architectural structures is caused by the fact that the members constituting the structure are destroyed by excessive load or insufficient strength, which causes the stability of the building structure to be impaired and the shape of the building to be significantly deformed and the internal space to be reduced.

In the case of a building, it is common for the floor to be folded over or broken as a pan cake. In bridges, bridge piers are destroyed and collapsed in many cases. Accordingly, it is possible to suppress the sudden collapse of the structure, and to prevent the collapse of the structure or property after the column is broken, while preventing the overall stability of the structure from being impaired while reinforcing the column or pier in the civil engineering or building structure, It is possible to reduce the possibility of damage.

In the conventional case, the following method has been employed in order to avoid the collapse of civil engineering and building structures and secure its safety.

First, in consideration of the sum of the self weight of the column and the sudden external force, the section, etc., is determined so as not to be destroyed at a preset required load.

Second, when the sudden external force expected after installation increases, or when the strength decreases due to aging of the column, the cross-sectional area of the column is increased or the strength of the material is increased. Further, a high-strength member such as an iron plate or carbon fiber is provided on the peripheral surface of the column to increase the yield strength and the energy absorption performance (toughness) of the column to failure.

Third, a seismic isolation device is installed to reduce the force.

Fourth, if the building structure is damaged by the earthquake, the emergency injunction is executed and the prohibition of entrance is decided according to the degree of damage. In addition, when the design standard is revised and the assumed earthquake load increases, the earthquake-proof diagnosis is carried out for the existing building structure, and the earthquake resistance and reinforcement are encouraged for those determined to be dangerous.

However, all the conventional methods are based on a relationship with an assumed level (design value) of sudden external force such as an earthquake set in advance, and when a force exceeding this assumed level acts on a column or a beam Since the columns or beams are destroyed, there is no guarantee that the stability of civil engineering and architectural structures can be ensured.

In addition, the costs, time, and materials required for the construction have reached a considerable proportion, even if they are not equal to the new construction cost, so that the cost burden can not be tolerated in many cases. In addition, there are many cases where skilled workers such as welders, steelworkers, and finishing crafts, which are difficult to obtain, are required. Therefore, even if the existing civil engineering and building structures are known to be highly dangerous due to damage due to earthquakes, reinforcement can not be implemented due to economic or physical constraints in many cases. In addition, when the emergency risk after the earthquake is judged, the researcher who goes in and out of the building is caught by the collapse of the building due to the excavation, or the building is judged safe because of slight damage. Of the population.

On the other hand, Korean Patent Laid-Open No. 10-2012-0114101 (October 16, 2012) has been proposed as a prior art related to this.

This patent discloses a structure in which a flexible reinforced panel is attached to the surface of a concrete structure in a vertical direction and then a fiber belt is provided on the surface of the reinforced reinforced panel. As a result, the pillars, beams, It is configured to suppress sudden collapse.

However, since the above-mentioned patent is constructed in such a manner that a soft reinforced panel is attached to the surface of a concrete structure, it is difficult to form sufficient rigidity.

Especially, when the column has a rectangular cross section, the fiber belt which abuts the corner portion has a maximum shearing force when a compression force is generated on the column, and consequently a concentrated load is generated.

If the surface treatment of the corner portion of the column is performed, it is possible to prevent the sheathing of the fiber belt as shown in FIG. 1, but if the edges of the rectangular cross-section are subjected to surface treatment, Not only the whole process time is delayed, but also the working environment due to scattered dust is hindered. In particular, when the structural strength of the column is influenced, there arises a problem that the designed strength is not reached.

In order to solve the above problems, it is an object of the present invention to provide a repair and reinforcement method for improving the seismic performance of a concrete structure capable of improving the seismic reinforcing ability of a concrete structure by simple and stable repair and reinforcement.

Another object of the present invention is to improve the seismic strengthening ability by preventing the shear force of the reinforcing fiber sheet by a simple structure when reinforcing the compressive force of the concrete column.

Another object of the present invention is to apply a non-solvent type ceramic coating agent to a concrete structure so that it can be used in a water treatment facility.

According to the present invention, it is possible to improve the seismic strengthening ability of a concrete column by solving the problem even if the reinforcing bar is insufficient by inserting the carbon fiber composite near the surface into the insertion groove in the concrete column.

In addition, the compressive force of the concrete column can be improved through the reinforced fiber sheet to improve the load-bearing capacity.

In particular, when the concrete column has a square cross-section, a reinforcement material is attached to the corner portion to prevent shear failure of the reinforced fiber sheet, thereby preventing premature failure of the reinforced fiber sheet when a compressive force is generated.

In addition, it is a useful invention that can be applied to a concrete structure such as a water treatment facility by forming an eco-friendly ceramic coating on a concrete structure.

FIG. 1 is a photograph showing a state in which a fiber sheet is shear-destroyed at the corner portion of a square cross-section concrete column. FIG.
2 is a sectional view showing a state after construction according to the present invention.

Hereinafter, the configuration of the present invention will be described in more detail with reference to the accompanying drawings.

The concrete structure 10 in the present invention includes bridge bridges, bridges, pillars, beams, walls, and red bricks constituting buildings and structures of water treatment facilities.

First, the surface preparation step is carried out in the same manner as in FIG. 1 except that a concrete column 11 having a circular or rectangular cross section constituting the concrete structure 10, a concrete wall 12 formed between the concrete columns 11, 13, and when the flatness of the surface is poor, the surface of the concrete structure 10 is maintained in a sound condition by performing the flattening work in parallel.

3 (a), when the concrete pillar 11 has a circular cross-sectional shape when the surface preparation step of the concrete structure 10 is completed, The reinforcing fiber sheet 30 impregnated with the epoxy resin is wound around the reinforcing fiber sheet 30 to reinforce the reinforcing fiber sheet 30. (Concrete column first reinforcing step)

In the case where the concrete column 11 has a rectangular cross section, the reinforcing fiber sheet 30 is wound on the surface of the concrete column 11 in the same manner as the concrete column 11 having a circular cross section, The front edge of the reinforcing fiber sheet 30 is concentrated as shown in FIG. 1, and in particular, the shearing phenomenon of the reinforcing fiber sheet 30 is affected by a load acting on the concrete column 11 When the compressive force is generated, there is a possibility that the reinforcing fiber sheet 30 is prematurely broken due to more concentration at the edge (E) portion.

In the present invention, in order to reinforce a concrete column 11 having a rectangular cross-sectional shape, a reinforcing material 40 for forming a curvature at a sharp edge E as shown in FIG. 3 (b) The reinforcing fiber sheet 30 is wound in the horizontal direction on the surface of the concrete column 11 to be reinforced. At this time, the reinforcing material 40 is made of a soft synthetic resin material.

If the reinforcing material 40 is made of a material having a high hardness, the reinforcing material 40 is not bent properly when it is attached to the concrete column 11, so that the adhesion with the concrete column 11 is lowered, thereby reducing the reinforcing ability.

At this time, an epoxy resin is applied in a solid form between the inside of the reinforcing member 40 and the surface of the concrete column 11 so that the bending of the reinforcing member 40 is minimized by the edge E of the concrete column 11 It is good to form a round.

As described above, the reinforcing material 40 covers the sharp edge E of the concrete column 11 having a rectangular cross section to perform the same function as the surface treatment to prevent shear failure of the reinforcing fiber sheet 30 It is necessary to adhere and adhere to the surface of the concrete column 11 using an epoxy resin so as to prevent lifting phenomenon when the concrete column 11 is adhered to the corner E of the concrete column 11.

If the stiffener 40 is not completely tightly coupled, the reinforcing fiber sheet 30 may not be attached to the concrete column 11, resulting in a problem that the reinforcing ability is deteriorated.

Therefore, the reinforcing material 40 is made of a material that is easily adhered to the concrete column 11 by an epoxy resin, and is made to have a wire-type shape so as to be more closely adhered to the concrete column 11, More preferably, it is not a complete circle but a shape having a certain radius of curvature divided by approximately a circle. In this case, the radius of curvature is preferably within the range of 50 to 100 mm.

If the radius of curvature of the stiffener 40 is less than the threshold value, the radius of curvature formed at the edge E of the concrete column 11 is small, so that the effect of generating the shear of the reinforcing fiber sheet 30 is small, When the reinforcing material 40 is adhered to the concrete column 11 to attach the reinforcing material 40 to the reinforcing fiber sheet 30, the reinforcing material 40 is bent and the contact area between the concrete column 11 and the reinforcing fiber sheet 30 is reduced. A problem occurs in that the temperature is lowered.

Here, the above-mentioned reinforcing fiber sheet 30 can be formed of any one selected from a glass fiber sheet, a carbon fiber sheet, a fiber sheet in which carbon fiber and glass fiber yarn are mixed, a polyparaphenylen benzobisoxazole fiber sheet, and a barat fiber sheet.

As described above, the present invention forms the stiffener 40 so that the reinforcing fiber sheet 30 does not contact the edge E of the concrete structure 10. Therefore, when a compressive force is generated in the concrete column 11, It is possible to prevent the reinforcing fiber sheet 30 from being sheared by the reinforcing fiber sheet 11, thereby enhancing the seismic reinforcing ability by maintenance and reinforcement.

Particularly when reinforcing the concrete structure 10, more specifically, since the reinforcing material 40 is adhered to the sharp edge E when reinforcing the concrete column 11 having a rectangular cross section, the process for machining the edge E is reduced Accordingly, not only the construction period due to the shortening of the total number of processes can be shortened, but also the dust is not scattered during the surface treatment, so that the working environment can be improved.

Meanwhile, in the present invention, the first reinforcing step of the concrete column can be further performed before the second reinforcing step of the concrete column.

The reinforcing step of the concrete column firstly forms an insertion groove h in the concrete column 11 on which surface preparation is completed and a carbon fiber composite 20 impregnated with the epoxy resin and hardened and an epoxy resin So that the reinforced concrete column 11 can be reinforced.

The insertion grooves h are equally spaced on the surface of the concrete column 11 and have a width of 1.4 to 2.8 mm and a depth of 10 to 20 mm.

The first reinforcing step of the concrete column can improve the seismic reinforcing ability of the new concrete concrete column 11, and in particular, when applied to a site where the amount of reinforcing steel of the existing concrete column 11 is not satisfied with the reference value, The fiber composite 20 plays the same role as the reinforcing steel bar so that the seismic performance can be further improved.

Meanwhile, in the present invention, it is possible to further include a step of reinforcing the concrete wall 12 formed between the concrete columns 11. (Concrete Wall Reinforcement Step)

The concrete wall reinforcing step may be performed after the surface preparation step or the first concrete reinforcing step, or after the first concrete reinforcing step, or simultaneously with or after the concrete reinforcing step, Or the like, at any time when the surface cleaning is completed.

The reinforcing step of the concrete wall can be completed by applying a conventional primer to the surface of the concrete wall surface 12, and then bonding a fiber sheet (not shown) on the primer.

Here, the fibrous sheet may be of a lattice network type in which a plurality of fibers are crossed with the weft yarns in the warp direction.

Meanwhile, in the present invention, the concrete beams 13 formed between the concrete columns 11 may be further provided with a beam strengthening member (not shown).

The reinforcing member may be a sheet or plate made of glass fiber, carbon fiber, Vassalt fiber or PBO fiber. In order to prevent deflection of the concrete beam 13, A plurality of anchoring operations may be further performed within the formed section.

In the present invention, a non-solvent type ceramic coating agent may be applied on the reinforcing members formed on the concrete structure 10 including the concrete column 11, the concrete wall 12, and the concrete beam 13.

The non-solvent type ceramic coating agent is an environmentally friendly coating agent prepared by mixing a ceramic powder with a coating agent prepared by mixing a curing agent with a base containing a non-solvent type epoxy coating.

Since the non-solvent type ceramic coating agent is excellent in waterproof performance and is resistant to corrosion, the method of the present invention is also applicable to a concrete structure 10 installed in a water treatment facility such as a water purification plant.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

10: Concrete structure
11: Concrete column h: Insertion groove E: Corner 12: Concrete wall
13: Concrete beam
20: carbon fiber composite
30: reinforced fiber sheet
40: Stiffener

Claims (8)

A surface cleaning step of arranging a surface of a concrete structure including a concrete column and a concrete wall surface of a circular cross section or a square cross section, and a beam;
After the surface preparation step, an insertion groove having a width of 1.4-2.8 mm and a depth of 10-20 mm is formed on the peripheral surface of the concrete column of the concrete structure at equal intervals, and then a carbon fiber composite is adhered to the insertion groove A first reinforcing step of a concrete column inserted and fixed together;
In the case of a concrete column having a circular cross section, the reinforcing fiber sheet impregnated with the epoxy resin is wound in a horizontal direction to reinforce the reinforcing fiber sheet. When the concrete column has a rectangular cross section, the reinforcing fiber sheet impregnated with the epoxy resin is wound in a horizontal direction Wherein the reinforcing fiber sheet in the second reinforcing step of the concrete is made of any one selected from a glass fiber sheet, a carbon fiber sheet, a fiber sheet in which carbon fiber and glass fiber yarn are mixed, a PBO fiber sheet and a Vassalt fiber sheet, The reinforcing fiber sheet having a radius of curvature of 50 to 100 mm and a radius of curvature equal to a circle is divided into four parts by a soft synthetic resin material in the form of a wire so that the reinforcing fiber sheet is not broken by the respective corner portions formed, Reinforced concrete fiber reinforced concrete (CFRP) sheet;
After the surface preparation step or at the same time as or after the second reinforcing step of the concrete column, the primer is applied to the concrete wall of the concrete structure, and then reinforced with a lattice-netted fiber sheet formed by crossing a plurality of fibers in a warp direction Concrete wall reinforcement phase;
After the concrete reinforcing step and the concrete wall reinforcing step, the surface of the concrete column and the concrete wall is coated with a non-solvent type ceramic material prepared by mixing a ceramic material with a coating agent prepared by mixing a base material containing a non- And applying a non-solvent type ceramic coating agent for applying a coating agent to the concrete structure.
delete delete delete delete delete [7] The method of claim 1, wherein the reinforcing member is formed of a sheet or plate made of glass fiber, carbon fiber, varnish fiber or PBO fiber impregnated after the surface preparation step to reinforce the concrete beam. In order to prevent deflection of the beam 13, a plurality of anchoring operations are performed in a section where the beam reinforcing member is formed, and a ceramic powder is coated on the surface of the concrete beam by mixing a base material containing a non- And a non-solvent type ceramic coating agent for applying a non-solvent type ceramic coating agent prepared by mixing a non-solvent type ceramic coating agent prepared by mixing the non-solvent type ceramic coating agent.

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