KR100677846B1 - Curving Fiberboard - Google Patents

Abstract

The present invention relates to a fiber board used to reinforce a concrete structure. More specifically, the present invention relates to a fiber board mainly used in the prestressing reinforcement method for reinforcing by introducing compressive stress to the concrete to be reinforced.

The most important role in the prestressing method of tensioning fiber boards and fixing them in concrete structures is the performance of the fixing part. As a fixing system, a plate-shaped fixing plate is mainly used above and below a fiber board, and a method of fixing to a concrete structure while holding a fiber board is used.

In the case of the existing plate-shaped fixing plate, when tightening with bolts and nuts to hold the fiber board, bending deformation occurs in the fixing plate, resulting in uneven contact between the fixing plate and the fiber plate and thereby uneven bearing pressure. When the tensile force is applied to the fiber board in the longitudinal direction due to the tension work or the additional load, the stress distribution of the fiber board is also uneven, causing cracking in the longitudinal direction or partial breakage, thereby reducing the overall strength. Therefore, the entire surface of the fixing plate in contact with the fiber board is in contact with the fiber board evenly to induce an equal pressure stress, it is necessary to develop the details that can fully exhibit the material strength of the fiber board.

It is an object of the present invention to provide a fiber board which does not occur such an uneven contact.

Fibreboard, Prestressing, Concrete, FRP                  

Description

Fiber Reinforced Polymer plate with a rounded face}

1 is a perspective view of a curved fiber board made of unidirectional fibers of the present invention.

Figure 2 is a perspective view of a curved fiber plate made of unidirectional fibers further provided with a fabric (fabric) therein another embodiment of the present invention.

Figure 3 is a perspective view of a curved fiber plate made of unidirectional fibers further provided with a veil outside the embodiment of the present invention.

Figure 4 is a perspective view of a curved fiber plate made of unidirectional fibers having a veil on the outside, a fiber fabric (fabric) further on the inside of another embodiment of the present invention.

5 is a process chart for producing a curvature fiberboard of the present invention.

6 is a cross-sectional view of the fixing portion of the concrete structure reinforced with external prestressing using the curvature-type fiber plate of the present invention.

7 is a cross-sectional view of the fixing portion of the concrete structure reinforced with external prestressing using a conventional flat fiber board.

(Explanation of symbols for the main parts of the drawing)

100: curvature fiber plate 110: holder

111: unidirectional fiber 112: fabric (fabric)

113: veil 114: resin

115: resin impregnation tank 116: guide

117 mold 118 drawing machine

119: cutter 120: fixing plate

121: fixing top plate 122: bolt

123: anchor bolt 124: anchor nut

125: flat fiber board

As a method of reinforcing a concrete structure lacking load capacity, a popular method is an external prestressing reinforcement method using a fiber plate, which is a method of attaching and mounting a fiber plate made of carbon fiber or glass fiber to a concrete structure in a plate shape. When the fiber board serving as a reinforcing material is tensioned and attached to the concrete structure by this method, the compressive stress is introduced into the concrete to be reinforced, so that the load capacity is substantially increased, and cracks generated in the concrete can be suppressed or prevented from expanding. However, one of the keys to the success of this advanced process is the effective settlement of tensioned fiberboard in concrete structures.

Currently, a fixing method mainly used is a method of fixing a fixing plate by installing a fixing plate on the upper and lower portions of a fiber board and fastening them with bolts, and a steel plate having a flat plate shape is mainly used as the fixing plate. 7 illustrates a conventional scheme. The fixing lower plate 120 arranged as shown in Figure 7a is fixed to the anchor bolt 123 and the anchor nut 124 to the concrete structure, and the conventional flat fiber board 125 is placed thereon, and then the fixing upper plate ( The fiber board is gripped by fastening 121 to the fixing lower plate 120 by bolts 122. In such a fixing system, the conventional flat fiber board 125 should be fixed in a tensioned state, so that the fixing plate 121 and the fixing lower plate 120 should be closely adhered to each other as much as possible by tightening the bolts 122 so strongly that the fiber board does not slip between upper and lower fixing plates. It is held in the state.

As shown in FIG. 7B, when the bolt 122 is strongly tightened to close the fixing upper plate 121 and the fixing lower plate 120 as close as possible, bending occurs mainly in the upper plate 121. When 121 is pressing the conventional flat fiber board 125, a phenomenon in which the portion indicated by the arrow "A" is partially less than the portion indicated by the arrow "B" occurs. In other words, due to the non-uniform contact between the fixing plate and the fiber plate, non-uniform pressure stress distribution occurs in the transverse direction of the fiber plate, and when the tensile force acts in the longitudinal direction on the fiber plate, the stress distribution of the fiber plate is also uneven, resulting in splitting in the longitudinal direction. Partial fracture occurs, which acts as a factor of lowering the overall strength.

It is an object of the present invention to provide a means for solving the problem of non-uniform contact between a fixing plate and a fiber plate due to the bending of the fixing plate, which occurs in fixing the fiber plate described above.

Fixing a fiber board to a concrete structure using a flat fixing plate, which is a conventional fixing system, has the advantage that the fixing system is very simple and easy to manufacture and install. Therefore, while utilizing a fixing system having such an advantage, the fiber board, which is a reinforcing material, does not occur, which is a problem caused by the fixing plate not being uniformly contacted with the fiber plate, which is pointed out as a problem of the conventional technology, It is to provide a means to maximize the tensile capacity.

In order to solve the problems as described above, the present invention provides a curvature-type scum plate comprising carbon fibers, glass fibers, or aramid fibers bonded by a resin in one direction; In addition to the unidirectional fibrous layer of carbon fibers, glass fibers or aramid fibers bonded by a resin, there is provided a curvature fibrous plate further provided with a fibrous layer of carbon fibers, glass fibers or aramid fibers bonded by a resin.

An embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view of a curved fiber plate 100 made of unidirectional fibers as an embodiment of the present invention.

One side is a curved surface and the other side is a horizontal surface, and is composed of a unidirectional fiber 111 layer made of any one or a combination of two or more carbon fibers, glass fibers, and aramid fibers. One-way fiber 111 constituting the curvature-type fiber plate 100 is about 50 to 80% by volume ratio and the rest is a thermosetting resin 114 that serves as a binder between the fibers.

Figure 2 is a perspective view of a curvature-type fiber plate 100 consisting of a one-way fiber 111 is further provided with a textile fabric 112 therein another embodiment of the present invention.

One side is curved and the other side is horizontal; One-way fiber 111 layer forming a horizontal surface portion of any one or a combination of two or more of carbon fiber, glass fiber, aramid fiber; A fiber fabric (112) layer laminated on the one-way fiber (111) layer on top of any one or two or more of carbon fiber, glass fiber, and aramid fiber; The carbon fiber, glass fiber, aramid fiber is composed of one or two or more combinations of two or more of the one-way fiber (111) layer forming a curved portion.

One-way fiber 111 of the configuration is about 50 to 80% by volume ratio and the rest is a thermosetting resin 114 that serves as a binder between the fibers. The fiber fabric 112 layer provided between the one-way fiber 111 layer is a structure in which the resin 114 is filled between the fibers composed of a lattice because the fiber fabric 112 is impregnated with the thermosetting resin 114 and laminated. . The fiber fabric 112 layer and the unidirectional fiber 111 layer are structured to be integrated by the resin 114.

3 is a perspective view of a curvature-type fiber plate 100 consisting of a one-way fiber 111 is further provided with a veil 113 to the outside of another embodiment of the present invention.

One side is curved and the other side is horizontal; A unidirectional fiber (111) layer made of any one or a combination of two or more of carbon fiber, glass fiber, and aramid fiber; The upper and lower surfaces of the one-way fiber 111 layer is composed of a layer of veil 113 stacked on the horizontal surface. One-way fiber 111 constituting the curvature-type fiber plate 100 is about 50 to 80% by volume ratio and the rest is a thermosetting resin 114 that serves as a binder between the fibers. The one-way fiber 111 layer and the veil 113 layer are integrated with the resin 114.

The bale 113 is optionally used among polyester veil, glass veil, aramid veil, carbon veil, nylon veil, and by further stacking the veil 113 on the outer surface as described above, the weight of the curvature-type fiber plate 100 It has the effect of thickening the resin layer of the outer surface area without significant change, protecting the fibers integrated inside from the ultraviolet rays of sunlight or alkali components of concrete, making the outer surface color beautiful, and minimizing the splitting of the fiber board. Can be harvested.

4 is a perspective view of a curvature-type fibreboard made of unidirectional fibers 111 further provided with a veil 113 on the outside and a textile fabric 112 on the outside, which is another embodiment of the present invention.

One side is curved and the other side is horizontal; One-way fiber 111 layer forming a horizontal surface portion of any one or a combination of two or more of carbon fiber, glass fiber, aramid fiber; A fiber fabric (112) layer laminated on the one-way fiber (111) layer on top of any one or two or more of carbon fiber, glass fiber, and aramid fiber; A one-way fiber (111) layer laminated with any one or two or more combinations of the carbon fiber, glass fiber, and aramid fiber to form a curved portion; It is composed of a layer of veil 113 stacked on the curved surface and the horizontal surface of the upper and lower surfaces of the one-way fiber 111 layer.

One-way fiber 111 constituting the curvature-type fiber plate 100 is about 50 to 80% by volume ratio and the rest is a thermosetting resin 114 that serves as a binder between the fibers. The one-way fiber 111 layer and the veil 113 layer are integrated with the resin 114.

The bale 113 is optionally used among polyester veil, glass veil, aramid veil, carbon veil, nylon veil, and by further stacking the veil 113 on the outer surface as described above, the weight of the curvature-type fiber plate 100 It has the effect of thickening the resin layer of the outer surface area without significant change, protecting the fibers integrated inside from the ultraviolet rays of sunlight or alkali components of concrete, making the outer surface color beautiful, and minimizing the splitting of the fiber board. Can be harvested.

5 is a process chart for producing the curvature fiberboard 100 described above.

The process is a cradle 110 for mounting carbon fibers or glass fibers, unidirectional fibers such as aramid fibers 111 or fiber fabric 112 and the bale 113, the unidirectional fibers, fiber fabrics, bales resin 114 Resin impregnating tank 115 to be impregnated in, a mold 117 for converging the respective resin-impregnated materials to form a curvature fiber plate 100 of one plate shape, a curvature fiber plate molded in the mold 117 ( A drawing machine 118 for drawing 100 and a cutting machine 119 for cutting the drawn curvature fiber board 100 to a required length.

The mold 117 to be molded in the process includes a heating function, it is a structure for heating the resin impregnated material entering the mold 117 by heating to a temperature up to about 180 ℃.

The cradle 110 is used differently according to the type and number of materials to be injected, in the case of the 'curved fiber plate made of unidirectional fibers' illustrated in FIG. 1, the one-way fibers 111 in A of the cradle 110 of FIG. 5. The process is progressed through. In the case of the 'curved fiber plate made of unidirectional fibers with fiber fabrics' illustrated in FIG. 2, the fiber fabric 112 is attached to A, and the unidirectional fibers 111 are mounted to C and D to proceed the process. In the case of the 'curved fibrous plate made of unidirectional fibers with a bale' illustrated in FIG. 3, the unidirectional fibers 111, A and B are mounted on the veils 113, and the process proceeds. In the case of the 'curved fibrous plate of unidirectional fibers provided with a veil and fiber fabric' illustrated in FIG. 4, the fiber fabric 112 in A, the unidirectional fiber 111 in C and D, and the veil 113 in B and E This process is carried out.

6 is a cross-sectional view of the fixing portion of the concrete structure reinforced with external prestressing using the curvature-type fiber plate 100 of the present invention.

The fixing lower plate 120 is fixed to the concrete structure by the anchor bolt 123 and the anchor nut 124 at the position where the concrete is cut out as much as the fixing lower plate 120. After placing the curvature fiber plate 100 of the present invention so that its horizontal surface touches the upper surface of the fixing lower plate 120, the fixing top plate 121 is placed on the curved surface of the upper surface of the curvature fiber plate 100. The fixing top plate 121 is coupled to the fixing lower plate 120 by the bolts 122, and the bolt 122 is maximally tightened to prevent the curvature-type fiber plate 100 from slipping between the fixing upper plate 121 and the fixing lower plate 120. To be gripped. As described above, when the fixing upper plate 121 is coupled to the fixing lower plate 120 by tightening the bolt 122 as much as possible, the fixing upper plate 121 bends to correspond to the curved surface of the curvature-type fiber plate 100 while being as close as possible. In this way, the fixing top plate 121 is installed in close contact with the curvature-type fiber plate 100, so that uniform friction resistance is generated between the entire surface of the fixing plate and the curvature-type fiber plate 100, even if the tension-induced fiber sheet 100 is introduced. Gripping is possible without splitting due to uneven stress of the fiber board.

By curved one surface of the fiber board as described above, by inducing a uniform contact between the fixing plate and the fiber plate fixing means for holding the fiber board to fix on the concrete structure to equalize the lateral stress distribution of the fiber board and maximize the frictional resistance, Even the tensioned fiberboard had the effect of being settled on the concrete structure without premature splitting or slipping of the fiberboard. As a result, it is possible to establish a firm fixation, which is one of the most important factors in the successful application of the external prestressing reinforcement method, which tensions the fiber board to reinforce the concrete structure. .

Claims (4)

One side is curved and the other side is horizontal; A curvature fibrous sheet composed of one-way fibers (111) layers impregnated in a resin made of any one of carbon fibers, glass fibers, aramid fibers, or a combination of two or more thereof. The method of claim 1; A curvature-type fiber plate in which one or more veils 113 of the polyester veil, the glass veil, the aramid veil, the carbon veil, or the nylon veil is further laminated on the curved surface and the horizontal surface of the unidirectional fiber 111 layer. One side is curved and the other side is horizontal; A unidirectional fiber (111) layer impregnated in the resin, which forms a horizontal surface portion by any one or a combination of two or more of carbon fibers, glass fibers, and aramid fibers; A one or two or more combinations of carbon fibers, glass fibers, and aramid fibers stacked on the one-way fiber 111 layer, and a fiber fabric 112 layer impregnated with a resin; The curvature-type fiber plate is composed of a one-way fiber (111) layer impregnated in the resin is laminated to any one or two or more combinations of the carbon fiber, glass fiber, aramid fiber to form a curved portion. The method of claim 3; A curvature-type fiber plate in which one or more layers of a bale 113 of a polyester veil, a glass veil, an aramid veil, a carbon veil, and a nylon veil is further laminated on the curved surface and the horizontal surface of the upper and lower unidirectional fibers 111.

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