KR20030039870A - Method for reinforcing con'c body using preflex panel and its structure - Google Patents

Abstract

PURPOSE: The process of reinforcing concrete structures by preflex panel is provided to evenly distribute bending moment caused by dead load of concrete structures through the recovering force of a preflex panel, therefore to effectively prevent the deflection of concrete structures. CONSTITUTION: The process of reinforcing concrete structures is composed of: manufacturing preflex panels(10) having certain amount of camber, according to condition of a structure; placing the convex part of a preflex panel to the lower face of the concrete structure(22); pushing up each end of the preflex panel to make the panel spread out to get a repulsive force against the dead load causing the deflection of concrete structures; joining the preflex panel with the concrete structure with a connecting device such as bolts and anchors.

Description

Method for reinforcing con'c body using preflex panel and its structure}

The present invention relates to a concrete structure reinforcement method using the preflex panel and its reinforcement structure. More specifically, the prestressed tension member is included in the lower part of the panel so that the prestress of the tension member contacts the lower surface of the concrete structure to reinforce the preflex panel which is convex in the center, and presses both ends of the preflex panel. The present invention relates to a construction method and a reinforcing structure for coupling with the concrete structure after being pushed up.

Since the load capacity of a concrete structure is determined by how much more active load or working load can be applied, it can be said that a structure capable of exerting a large load such as live load has a large load capacity. In other words, a structure having a large dead weight has a large bending moment due to the dead load, so that the working load or the live load is inevitably reduced.

As a reinforcing method of concrete structures used to date, there are various reinforcing methods such as steel plate bonding injection method, epoxy panel bonding method, cross section increasing method, member expansion method, and prestressing method.

Among them, the steel plate bonding injection method has excellent structural reinforcement effect because the reinforcing bars and reinforcement plates used in the existing bridges have similar material properties in elastic modulus, etc. In the case of repetitive action, the existing structure and the attached surface are relaxed, which is ineffective. In addition, the steel plate adhesive injection method has a problem that the reinforcing effect is very small when a lot of cracks and deflections occur in the existing structures such as bridges.

In addition, the epoxy panel bonding method currently used is a method similar to the steel sheet bonding method to place the epoxy panel on the surface of the structure, and then attach the panel to the surface of the structure with epoxy resin. Is determined. Therefore, when the concrete surface of the existing structure is corroded due to weathering, etc., the adhesion strength is not sufficient. Therefore, in the case of extreme load, peeling occurs in the existing concrete surface, resulting in adhesion failure, which is very brittle. This is very dangerous because it is contrary to the purpose of minimizing human and economic damage by inducing duct failure.

In addition, the cross-section increase method and the member enlargement method increase the dead weight of the existing structure, so when the increased load is large, the additional cost of the lower structure such as the column or the pier is increased as the load increase.

Therefore, the present inventors improve the load-bearing capacity of concrete structures such as bridges, prevent or prevent sagging from returning to its original state, and prevent the bending moment due to dead loads between the existing structure and the panel of the present invention, and at the same time, very resistant to corrosive environments. The concrete structure reinforcement method using strong preflex panel and its reinforcement structure were developed.

It is an object of the present invention to provide a concrete structure reinforcement method and its reinforcement structure in which the concrete structure and the preflex panel can share the bending moment due to dead load in a concrete structure in need of reinforcement.

It is an object of the present invention to provide a concrete structure reinforcing method and its reinforcing structure which can be combined with a concrete structure in which deflection occurs, thereby preventing, preventing or restoring further deflection.

An object of the present invention is to provide a concrete structure reinforcement method and its reinforcement structure resistant to the external corrosive environment.

Figure 1 (a) shows a perspective view of a preflex panel used in the method of the present invention.

Figure 1 (b) shows a front view of the preflex panel used in the method of the present invention.

Figure 1 (c) shows a side view of a preflex panel used in the method of the present invention.

Figure 2 (a) is a device for raising the center portion of the preflex panel in contact with the lower surface of the slab structure of the bridge and by pressing both ends using the pulling device.

Figure 2 (b) is a state in which the center portion of the preflex panel is in contact with the lower surface of the slab structure of the bridge and by pressing the both ends by using the lifting device to raise and then coupled the slab structure and the preflex panel by a coupling means Indicates.

Figure 3 (a) shows the reinforcement using the preflex panel 10 in the continuous beam.

Fig. 3 (b) shows the bending moment due to dead weight, which is the bending moment before reinforcement with the panel 10 in the continuous beam.

Fig. 3C is a bending moment diagram of the preflex panel 10 by bending.

Fig. 3 (d) is an overall bending moment diagram when the preflex panel 10 is coupled to the lower portion of the continuous beam.

4 shows a state in which a two-way slab bridge is reinforced with a preflex panel 32.

<Short description of the symbols in the drawings>

10: preflex panel 11: tension member

21: asphalt pavement 22: slabs of concrete structures

23: jack 24: anchor

25: epoxy resin

31: 2-way slab

32: preflex panel having tension members arranged in two directions

The present invention will be described below with reference to the drawings.

Fig. 1 shows a perspective view (Fig. 1 (a)), a front view (Fig. 1 (b)) and a side view (Fig. 1 (c)) of a preflex panel used in the method of the present invention.

The preflex panel 10 may be prepared by pouring epoxy resin mortar formed by mixing epoxy resin, silica sand, calcium carbonate, or the like with a prestressed tension member 11 or by pouring a material such as concrete. After the epoxy resin mortar or concrete is cured, the end portion of the tension member bonded to the fixed plate or the support plate is cut to allow the prestress applied to the tension member to act on the panel. In this case, due to the prestress applied to the tension member, a panel 10 is formed in which the panel is arcuately convex.

Figure 2 shows an embodiment of coupling the preflex panel 10 to the lower surface of the slab structure of the bridge as an embodiment of the present invention.

Hereinafter, each step of the method of the present invention and the structure of the method will be described in detail.

Manufacturing a preflex panel (10) to have an appropriate camber according to the state of the structure to be reinforced; Bringing the center convex portion of the preflex panel 10 into close contact with the bottom surface of the structure to be reinforced 22; Pushing both ends of the panel into the lifting device 23 to unfold the preflex panel; And coupling the preflex panel and the structure using a coupling means. An anchor hole or a bolt hole for coupling to the preflex panel and the reinforcement target structure may be formed.

When the preflex panel and the reinforcement target structure are combined by using a coupling means such as an anchor as shown in FIG. 2 (b), the deflection of the structure may be prevented or prevented from being restored or prevented due to the restoring force to recover the original state. In addition, the absolute value of the bending moment due to dead load can be reduced.

In addition, the epoxy 25 can be injected between the concrete structure to be reinforced and the preflex panel to achieve complete integration. That is, the injection hole and the exhaust port are constantly arranged in the preflex panel, and the epoxy is injected through the injection hole, and the injection state can be confirmed through the exhaust port.

As described above, the structure of the present invention is a concrete structure to be reinforced; A preflex panel pushed up by pressing both ends after contacting a lower portion of the concrete structure to be reinforced; And coupling means for coupling the reinforcement target concrete structure and the preflex panel. Characterized in that it comprises a. In addition, the above structure may be filled with an epoxy resin or the like between the reinforced concrete structure and the preflex panel. As the coupling means, a bolt or an anchor can be considered.

Like the above-described method and structure, continuous impact by combining the concrete structure to be reinforced with the preflex panel 10 using an impression device (jack, etc.) and filling (25) between the structure and the panel using epoxy or the like. Or it is to be integrated with the structure stably even under the vibration load.

Figure 3 (a) shows the reinforcement using a preflex panel in the continuous beam. Fig. 3 (b) shows the bending moment due to dead weight, which is the bending moment before reinforcement with the panel in the continuous beam. Fig. 3 (c) is a bending moment diagram of the preflex panel shown by bending. Fig. 3 (d) is an overall bending moment diagram when the preflex panel is coupled to the lower portion of the continuous beam.

As shown in Fig. 3, it is effective to install the preflex panel for reinforcement between the portions where the bending moment is zero, that is, the portions where the moment is negative. This is because deflection may occur when a negative moment is applied, since the deflection may be effectively reinforced by reinforcing the deflection with the arc of the preflex panel. In the above case, when the reinforced concrete structure is a continuous slab, it is more effective for the reinforcement to make the direction of the main tension member of the reinforcement target structure parallel to the direction of the tension member of the preflex panel. This is because it is more effective to make the direction of the main tension member of the concrete structure to be reinforced and the direction of the tension member of the preflex panel parallel to each other because a tensile force is applied to the lower portion of the slab cross section when a negative bending moment is applied.

As shown in Fig. 3 (d), by using the method and structure of the present invention, the absolute value of the bending moment due to dead load can be reduced, and thus the load capacity against live load or working load can be increased.

4 shows a state in which a two-way slab bridge is reinforced with a preflex panel 32.

In the case of a two-way simple slab, the tension members in the panel 32 may be disposed to be perpendicular to each other in two directions.

In the case of a two-way continuous slab, the tension members in the panel 32 may be disposed to be perpendicular to each other in two directions. In this case, it is more effective to reinforce the section 32 in which the bending moment is negative with the panel 32.

According to the present invention, by reinforcing a concrete structure requiring reinforcement using a preflex panel, the absolute value of the bending moment due to dead load can be reduced to increase the load capacity of the concrete structure with respect to the working load or the live load. The present invention can be prevented by restoring the deflection of a structure in which deflection has occurred by reinforcing using a preflex panel or preventing further deflection. In addition, by reinforcing the section having a negative bending moment with the preflex panel, it can effectively cope with deflection and effectively reinforce the concrete structure.

The present invention combines the reinforced concrete structure and the preflex panel by using an impression device and by filling the structure and the panel using an epoxy or the like to be integrated with the structure stably even under continuous impact or vibration load.

Claims (9)

Manufacturing a preflex panel bent and formed to have a camber set according to a region to be reinforced of a concrete structure; Contacting a center portion of the preflex panel with a lower portion of the concrete structure; Pushing up both ends of the preflex so that the preflex panel is unfolded; And Coupling the structure and the preflex panel; Concrete structure reinforcement method comprising a. The bending moment of the structure to be reinforced is negative when the direction of the main tension member of the structure to be reinforced and the direction of the tension member of the preflex panel are parallel to each other when the concrete structure to be reinforced is a continuous slab. Concrete structure reinforcement method characterized in that for reinforcing the phosphorus section with the preflex panel. 3. The method of claim 1, wherein the reinforcement target concrete structure and the preflex panel are coupled using a bolt or an anchor. The method of claim 1, wherein the concrete structure reinforcement method is characterized in that the filling between the reinforced concrete structure and the preflex panel using an epoxy resin. Concrete structures to be reinforced; A preflex panel pushed up by pressing both ends after contacting a lower portion of the concrete structure to be reinforced; And Coupling means for coupling the reinforcement target concrete structure and the preflex panel; Concrete structure reinforcement structure comprising a. The concrete structure according to claim 5, wherein the concrete structure includes a preflex panel in which the direction of the main tension member of the structure to be reinforced and the direction of the tension member included therein are parallel to each other when the concrete structure to be reinforced is a continuous slab. Reinforcement structure. The reinforcement of the concrete structure according to claim 5 or 6, further comprising a preflex panel reinforcing a section in which the bending moment of the reinforcement concrete structure is negative when the concrete structure to be reinforced is a continuous slab. rescue. The reinforcing structure of concrete structure according to claim 5 or 6, wherein the coupling means is a bolt or an anchor. The reinforced concrete structure of claim 5 to 6, further comprising an epoxy resin filling between the reinforced concrete structure and the preflex panel.