KR20040080388A - Anchoring system of fiber composite plate to strengthen RC structures - Google Patents

Abstract

PURPOSE: A fiber board anchoring system for the concrete structure reinforcement is provided to maximize the frictional force of an anchorage plate to prevent a fiber board from sliding from an anchorage plate. CONSTITUTION: The fiber board anchoring system for the concrete structure reinforcement comprises: an upper anchorage plate(110) provided with a pressure unit(111) and spiral scratches(450) and bolt holes(411) formed on both vertical edges to couple with a lower anchorage plate(210); and a lower anchorage plate(210) provided with spiral scratches(450) formed on a contact surface with the fiber board, bolt holes(411) formed on both outer sides of the scratch(450) to couple with the upper anchorage plate(110) by a bolt, and a bolt hole(412) formed on the outer edge of the bolt hole(411) to fix vertically to a concrete structure by an anchor bolt.

Description

Fiber plate fixing system for reinforcing concrete structures {Anchoring system of fiber composite plate to strengthen RC structures}

As a method of reinforcing concrete structures lacking load capacity, a popular technique is reinforcement by prestressed fiberboard, which is a method of attaching and installing a fiber board made of plate-shaped carbon fiber or glass fiber to a concrete structure. When the fiber board serving as the reinforcing material is 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 the cracks generated in the concrete can be suppressed or prevented from expanding. However, the key to the success of this advanced process is to provide a means for effectively anchoring the tensioned fiberboard to the concrete structure.

Currently, fixing is mainly performed at both ends of a fiber board by using a fixing plate, and a flat steel is used as the fixing plate. That is, as illustrated in FIG. 12A, the fixing lower plate 920 disposed under the fiber plate 500 is fixed to the concrete structure 700 with the anchor bolt 402, and the fixing plate is placed thereon. The fiber board is gripped by tightening the 910 with the bolts 401 and nuts 403. Since the fixing system is applied while the fiber plate 500 is in a tense state, the fixing plate 910 and the fixing plate 920 are tightened very strongly so that the fiber plate 500 does not slip.

As described above, when the fixing top plate and the fixing bottom plate are firmly tightened, warpage occurs mainly in the top plate 910 as illustrated in FIG. 12B, and as a result, when the fixing top plate 910 presses the fiber plate 500, an arrow " The phenomenon that the portion indicated by B "is partially less acupressure than the portion indicated by the arrow" A "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 occurred, which acted as a factor of lowering the overall strength.

It is an object of the present invention to provide a fixing system which solves the problem of uneven contact between a fixing plate and a fiber board due to the bending of the fixing plate, which is a problem of the fixing system described above. In addition, to provide a surface roughness molding method that can maximize the friction between the fixing plate and the fiber plate without damaging the fiber plate.

In the fixing system of the present invention, even when the fixing upper plate and the lower plate holding the fiber board are tightened with bolts, the fixing plate is brought into contact with the fiber board as uniformly as possible, thereby preventing the fiber board from slipping and sliding the surface of the fixing plate surface in contact with the fiber board. By providing the structure which does not generate | occur | produce, it is providing the fixing system which can exhibit the tensile capability of a fiber board to the maximum.

1 is a diagram schematically illustrating a state in which a fiber board is reinforced and installed in a concrete structure using the fixing system of the present invention.

2 is a view showing a fixing top plate and a fixing bottom plate constituting an embodiment of the fixing system of the present invention.

Figure 3 is a view showing the bottom and the cross-section of the fixing system of Figure 2 installed in a concrete structure.

4 is a view showing a fixing top plate and a push tab constituting another embodiment of the fixing system of the present invention.

Figure 5 is a view showing the bottom and the cross-section of the fixing system of Figure 4 installed in a concrete structure.

6 is a view showing a fixing top plate and a fixing bottom plate constituting another embodiment of the fixing system of the present invention.

7 is a view showing the bottom and the cross-section of the fixing system of Figure 6 installed in the concrete structure.

8 is a view showing a fixing top plate constituting another embodiment of the fixing system of the present invention.

Figure 9 is a view showing the bottom and the cross-section of the fixing system of Figure 8 installed in a concrete structure.

10 shows another embodiment of the fixing system of the present invention.

Fig. 11 is a view showing scratches processed on the surface of the fixing plate constituting the fixing system of the present invention.

12 is a cross-sectional view showing a bending state of the fixing plate as an embodiment of a conventional fixing system.

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

110 FIXED TOPS A 111

Chiropractor-curved

120 Top plate B 122

Chiropractor-Uneven Stair Type

130 Top plate C 132

Upper projection

134 Bottom projection 140

Settlement Top D

210 Fixed Bottom Plate A 220

Settlement Bottom Plate C

221 Groove-Top Plate Insert 310

Push tab

311 Groove-for Push Tab Insertion 401

Bolt-for fixing lower plate

401b Bolt-for tightening the push tab 402

Anchor bolt

403 Nut 411

Bolt Inserting Hole -For Upper and Lower Plate Connection

412 Bolt-Inlet-For Anchor Bolts 413

Bolt Insert-For Pushing Tapped

450 Scratch 500

Fiberboard

600 Settling System 700

Concrete structure

910 Fixing Top-Conventional 920

Fusing Bottom Plate-Conventional

In order to solve the problems of the fixing system as described above, the present invention provides a fixing system of various modified forms.

1 is a diagram schematically illustrating a state in which a concrete structure is reinforced by a reinforcing method using a prestressed fiber board, which is installed in the concrete structure 700 in a tensioned state by applying the fixing system of the present invention. Both ends of the fiber board 500, which is a reinforcing material, are installed in a state in which a fixing system 600 composed of a fixing upper plate and a lower plate is integrated with the concrete structure.

2 is a view showing an embodiment of a fixing system of the present invention. 2A shows the fixing top plate A 110, and FIG. 2B shows the fixing bottom plate A 210. The upper surface of the fixing upper plate A (110) is a flat surface, the lower surface of the acupressure part 111 for acupressure the fiber plate 500 has a feature that is processed to have a certain curvature. In order to solve the deflection problem of the fixing plate, which is the problem described above in the related art, the fixing system has previously processed the amount of deflection to the fixing plate in reverse. In addition, a bolt insertion hole 411 for assembling with the fixing lower plate A 210 is penetrated at both edges along the longitudinal direction. In order to improve the bearing pressure with respect to the fiber board 500, the said scratch part 111 is continuously overlapped by the spiral scratch 450. As shown in FIG.

2B illustrates a fixing lower plate A 210 forming a pair with the fixing upper plate A 110. Scratch 450 is processed in the center of the upper surface on which the fiber board 500 is placed, and is made of flat steel. The scratches 450 are overlapped at a predetermined interval in succession of spiral scratches. In this way, by continuously overlapping the spiral scratch 450 on the contact surface with the fiber board 500, the gripping force of the fiber board 500 by the fixing lower plate A 210 can be improved. Bolt-out holes 411 for assembling with the fixing top plate A 110 are penetrated outwardly of both longitudinal edges of the scratch 450. An anchor bolt bolt insertion hole 412 for fixing the anchor plate A 210 to the concrete structure 700 by the anchor bolt 402 is formed at the outer edge of the bolt insertion hole 411.

3 is a view showing the bottom and the cross-section of the fixing system of Figure 2 installed in a concrete structure. 3A is a bottom view and FIGS. 3B and 3C are cross-sectional views A-A in FIG. 3A. 3B is a state where the fixing upper plate A 110 and the fixing lower plate A 210 are installed, and FIG. 3C shows a state in which the fixing is completed.

After excavating the portion to install the fixing lower plate A (210) in the concrete structure 700, the anchoring bolt 402 and the nut 403 to fix the lower plate A (210) to fix the first. At this time, the bolt 401 is fixed in the assembled state in the bolt insertion hole 411 of the fixing lower plate A (210). The fiber plate 500 is placed on the upper surface scratch 450 of the fixing lower plate A 210, the fixing upper plate A 110 is inserted into the bolt 401, and the nut 403 is completely tightened. When tightened as described above, the fixing upper plate A (110) is bent while the curved pressure-sensitive portion 111 of the fixing upper plate A (110) becomes a flat contact with the fiber plate 500 as a whole. As shown in FIG. 3C, the fixing top plate A 110 is in close contact with the fiber plate 500 as described above.

4 is a view showing a fixing top plate and a push tab constituting another embodiment of the fixing system of the present invention. The fixing upper plate B 120 of FIG. 4 and the pressing tab 310 and the fixing lower plate A 210 of FIG. 2B form a pair. This embodiment is characterized by using the bending of the fixing top plate as the pressure using the push tab 310.

4A illustrates a fixing top plate B 120 made of steel having a U-shape, and a groove 311 into which the push tab 310 of FIG. 4B is inserted is processed, and the acupressure, which is a portion at which the push tab 310 is pressed. The portion 122 is processed into a stepped concavo-convex type that protrudes most at the center and protrudes toward the edge. In addition, the bolt insertion hole 411 is penetrated along the longitudinal edge, and is coupled to the fixing lower plate A 210 by the bolt 401 through the bolt insertion hole 411. 4B illustrates a press tab 310 made of steel, which serves to directly press the fiber plate 500. The scratch 450 is processed in the contact surface with the fiber board 500. The scratches 450 are overlapped at a predetermined interval in succession of spiral scratches. In this manner, by continuously overlapping the spiral scratch 450 on the contact surface with the fiber plate 500, the gripping force of the fiber plate 500 by the push tab 310 can be improved.

FIG. 5 is a view showing a bottom and a cross section of the fixing system of FIG. 4 installed in a concrete structure. FIG. FIG. 5A is a bottom view and FIG. 5B shows a cross section A-A in FIG. 5A. 5B shows the configuration of the fixing upper plate B 120, the push tab 310, and the fixing lower plate A 210.

After excavating the portion to install the fixing lower plate A (210) in the concrete structure 700, the anchoring bolt 402 and the nut 403 to fix the lower plate A (210) to fix the first. At this time, the bolt 401 is fixed in the assembled state in the bolt insertion hole 411 of the fixing lower plate A (210).

Place the fibrous plate 500 at the upper surface scratch 450 of the fixing lower plate A 210, insert the fixing upper plate B 120 into the bolt 401, and insert the push tab 310 into the groove 311 and the nut. Tighten 403 completely. When tightened as described above, while the fixing top plate B 120 is bent, the protruding portion edge of the stepped uneven pressure portion 122 of the fixing top plate B 120 presses the pressing tab, and the pressing tab 310 is the fiber board 500. It comes in close contact with the whole.

6 is a view showing a fixing upper plate and a fixing lower plate constituting still another embodiment of the fixing system of the present invention. The fixing upper plate C 130 of FIG. 6 and the fixing lower plate C 220 of FIG. 6 form a pair of push tabs 310 shown in FIG. 4B. This embodiment is characterized in that the pressing tab 310 is pressed by the bolt 401b fastened to the bolt insertion hole 413 of the fixing upper plate C 130 of the U-shaped steel.

6A illustrates a fixing top plate C 130, in which a groove 311 into which the push tab 310 of FIG. 4B is inserted is machined, and a bolt 401b pressing the push tab 310 in the center is inserted and fastened. The bolt insertion hole 413 to be penetrated is processed. The screw thread corresponding to the screw thread of the bolt 401b is machined in the bolt insertion hole 413. The bolt insertion hole 411 is penetrated along the longitudinal edge of the fixing upper plate C 130, and is coupled by the fixing lower plate C 220 and the bolt 401 through the bolt insertion hole 411. In the center of the upper surface of the fixing upper plate C 130, the dome-shaped upper protrusion 132 protrudes out of the portion except for the surface where the bolt insertion hole 411 is processed, so that the fixing lower plate C 220 may be fastened by bolting. In order to minimize warping, In addition, a lower protrusion 134 is formed below the fixing upper plate C 130, and the lower protrusion 134 is inserted into a groove 221 processed in the fixing lower plate C 220.

FIG. 6B illustrates a fixing lower plate C 220 forming a pair with the fixing upper plate C 130 of FIG. 6A. Scratch 450 is processed in the center of the upper surface on which the fiber board 500 is placed, and is made of flat steel. The scratches 450 are overlapped at a predetermined interval in succession of spiral scratches. Thus, by continuously overlapping the spiral scratch 450 on the contact surface with the fiber plate 500, the gripping force of the fiber plate 500 by the fixing lower plate C 220 can be improved.

Grooves 221 into which the lower protrusions 134 of the fixing upper plate C 130 are inserted are formed at both sides of the longitudinal edges of the scratch 450 and fixed to the outer side of the groove 221. The bolt insertion hole 411 for assembling the through is machined. At the outer edge of the bolt insertion hole 411, the anchor bolt bolt insertion hole 412 for fixing the fixing plate C 220 to the concrete structure 700 by the anchor bolt 402 is penetrated.

FIG. 7 is a view illustrating a bottom and a cross section of a state in which the fixing system of FIG. 6 is installed in a concrete structure. FIG. FIG. 7A is a bottom view and FIG. 7B shows a cross section A-A in FIG. 7A. 7B illustrates a configuration state of the fixing upper plate C 130, the push tab 310, and the fixing lower plate C 220.

After fixing the portion to install the fixing lower plate C (220) to the concrete structure 700, the anchoring plate 220 and the fixing plate with the anchor bolt 402 and the nut (403) to fix the first. At this time, the bolt 401 is fixed in the assembled state to the bolt insertion hole 411 of the fixing lower plate C (220).

Place the fibrous plate 500 on the upper surface scratch 450 of the fixing lower plate C 220, insert the fixing upper plate C 130 into the bolt 401, and insert the push tab 310 into the groove 311 and the nut. Tighten 403 completely. When the pressing tab 310 is pressed again by fastening the bolt 401b to the bolt insertion hole 413 of the fixing upper plate C 130, the pressing tab 310 comes into close contact with the fiber plate 500 as a whole.

8 is a view showing a fixing top plate constituting another embodiment of the fixing system of the present invention, Figure 9 is a view showing the bottom and the cross-section of the fixing system of Figure 8 installed in a concrete structure. As shown in FIG. 9, the fixing top plate D 140 of FIG. 8, the push tab 310 illustrated in FIG. 4B, and the fixing lower plate 210 illustrated in FIG. 2B form a pair. This embodiment is characterized in that the pressing tab 310 is pressed by the bolt 401b fastened to the bolt insertion hole 413 of the U-shaped fixing upper plate D 140.

8 illustrates a fixing top plate D 140, in which a groove 311 into which the push tab 310 of FIG. 4B is inserted is machined, and a bolt 401b for pressing the push tab 310 in the center is inserted and fastened. The bolt insertion hole 413 to be penetrated is processed. The screw thread corresponding to the screw thread of the bolt 401b is machined in the bolt insertion hole 413. A bolt insertion hole 411 is penetrated along the longitudinal edge of the fixing upper plate D 140, and is coupled by the fixing lower plate A 210 and the bolt 401 through the bolt insertion hole 411. The upper surface of the fixing upper plate D 140 is flat, and the upper surface of the push tab insertion groove 311 is also flat.

FIG. 9 is a view illustrating a bottom and a cross section of a state in which the fixing system of FIG. 8 is installed in a concrete structure. FIG. FIG. 9A is a bottom view and FIG. 9B shows a cross section A-A in FIG. 9A. FIG. 9B illustrates the configuration of the fixing upper plate D 140 of FIG. 8, the push tab 310 illustrated in FIG. 4B, and the fixing lower plate A 210 illustrated in FIG. 2B.

After excavating the portion to install the fixing lower plate A (210) in the concrete structure 700, the anchoring bolt 402 and the nut 403 to fix the lower plate A (210) to fix the first. At this time, the bolt 401 is fixed in the assembled state in the bolt insertion hole 411 of the fixing lower plate A (210).

Place the fibrous plate 500 on the upper surface scratch 450 of the fixing lower plate A 210, insert the fixing upper plate D 140 into the bolt 401, and insert the push tab 310 into the groove 311. Tighten nut 403 completely. The pressing tab 310 presses the bolt 401b through the bolt insertion hole 413 of the fixing upper plate D 140 again, and the pressing tab 310 comes into close contact with the fiber plate 500 as a whole.

FIG. 10 is a view illustrating a fixing system including a fixing upper plate A 110 of FIG. 2A, a push tab 310 of FIG. 4B, and a fixing lower plate A 210 of FIG. 2B. When the fixing top plate A (110) and the pressing tab 310 is used in this way, there is an effect that the fibrous plate more evenly acupressure.

FIG. 10A is a bottom view of a state in which a fixing system having the above configuration is installed in a concrete structure, and FIGS. 10B and 10C show a cross section A-A in FIG. 10A. FIG. 10B illustrates a state in which the fixing upper plate A 110 and the fixing lower plate A 210 are assembled using the bolts 401 and the nuts 403, and FIG. 10C shows the bolts 401 and the nuts 403. By tightening the curved surface portion of the acupressure portion 111 of the fixing upper plate A (110) is in close contact with the pressing tab 310, through which the pressing tab 310 is shown a structure in close contact with the fiber plate 500.

After excavating the portion to install the fixing lower plate A (210) in the concrete structure 700, the anchoring bolt 402 and the nut 403 to fix the lower plate A (210) to fix the first. At this time, the bolt 401 is fixed in the assembled state in the bolt insertion hole 411 of the fixing lower plate A (210).

The fiber plate 500 is placed on the upper surface scratch 450 of the fixing lower plate A 210, the pressing tab 310 is placed thereon, and then the fixing upper plate A 110 is inserted into the bolt 401, and the nut ( When the 403 is completely tightened, the curved portion, which is the acupressure part 111 of the fixing upper plate A 110, is in close contact with the press tab 310 as shown in FIG. 10C, and the press tab 310 is in close contact with the fiber plate 500.

FIG. 11 is a view showing a helical scratch 450 processed on the surface of the fixing plate 110 or the fixing lower plates 210 and 220 and the pressing tab 310 that is the fixing plate of the present invention. It shows the shape of the surface roughness of the spiral shape that can maximize the frictional force between the fixing plate and the fiber board without damaging the).

When the spiral scratch 450 is lathed, the cutting body moves horizontally at a low speed, and the cutting body moves horizontally at a high speed, unlike the conventional surface processing method of smoothly machining the surface by rotating the cutting rod at a high speed. It is obtained by cutting the surface while rotating the cutting rod at a low speed, and the spiral scratch is continuously stacked.

In this manner, by continuously overlapping the helical scratch on the surface of the fixing plate in contact with the fiber plate, the overlapping portions of the helical scratch can form diamond teeth, and the teeth can be distributed helically, so that the holding force of the fiber plate by the fixing plate can be achieved. Can greatly improve. FIG. 12A is a plan view showing a helical scratch 450 with continuous overlap processing, and FIG. 12B shows a cross section A-A of FIG. 12A.

As described above, in the case of a fixing system in which the fiber board is tensioned and fixed, a plate-shaped fixing plate is mainly used to fix the fiber board to fix the fiber board. When the gripped fiber board is slipped to relax, the desired reinforcement is performed. Hard to expect effects. Therefore, a surface forming method capable of maximizing the frictional force of the fixing plate is required first so that the fiber plate does not slip from the fixing plate. In addition, the upper and lower fixing plate should be tightened as much as possible to grip the fiber board, and this causes a problem that the warp occurs mainly in the upper fixing plate to significantly reduce the fiber board holding capacity.

In the present invention, to provide a fixing system that utilizes the bending of the fixing plate in the direction of improving the fiber board gripping capacity, or to improve the gripping capacity of the fiber board by using a fixing plate and a separate push tab of the shape to minimize the unevenness of the pressure stress As a result, it is possible to provide a fixing system utilized in the reinforcing method by the prestressed fiber board which tensions and reinforces the fiber board. In addition, the present invention has developed a surface roughness forming method that can maximize the friction between the fixing plate and the fiber board at low cost without damaging the fiber board.

Claims (6)

Constructing a prestressing reinforcement method for tensioning fiberboard and fixing it in concrete structures; The upper surface is flat, and the lower surface, which is the acupressure part 111 which presses the fiber board 500, is processed into a curved surface (a circular arc shape), and the spiral scratches 450 are successively overlapped, and on both edges in the longitudinal direction. A fixing upper plate 110 made of steel, through which a bolt insertion hole 411 used for coupling with the fixing lower plate 210 is processed; A spiral scratch 450 is continuously stacked on the contact surface with the fiber board, and a bolt insertion hole 411 for joining the fixing top plate 110 and the bolt 401 is penetrated through both sides of the scratch 450. And a fixing top plate composed of a flat plate-shaped steel plate 210 through which a bolt insertion hole 412 for fixing to a concrete structure by an anchor bolt in a longitudinal direction at an outer edge portion of the bolt insertion hole 411 is formed. A fixing system in which the fiber board is fixed between the 110 and the fixing lower plate 210. Constructing a prestressing reinforcement method for tensioning fiberboard and fixing it in concrete structures; The upper surface of the U-shaped steel is flat and the pressing tab 310 is inserted into the groove 311, the center of pressing the pressing tab 310 on the upper surface of the groove 311 is a stepped irregularities that are high and lowered to the edge A fixing upper plate 120 through which a bolt insertion hole 411 used for coupling with the fixing lower plate 210 along the longitudinal edge of the mold acupressure part 122 is machined; A push tab 310 made of a plate-shaped steel material in which a spiral scratch 450 is continuously stacked on a contact surface with a fiber plate inserted into the fixing top plate 120 groove 311; A spiral scratch 450 is continuously stacked on the contact surface with the fiber board, and the bolt insertion hole 411 for joining the fixing top plate 120 and the bolt 401 is penetrated through both sides of the scratch 450. And a press tab comprising a fixing lower plate 210 made of a plate-shaped steel, through which a bolt insertion hole 412 for fixing to a concrete structure by an anchor bolt in a longitudinal direction at the outer edge portion of the bolt insertion hole 411 is formed. A fixing system in which a fiber board is fixed between the 310 and the fixing lower plate 210. Constructing a prestressing reinforcement method for tensioning fiberboard and fixing it in concrete structures; The groove 311 into which the push tab 310 is inserted is processed, and the central portion of the upper surface protrudes in the portion except for the surface where the bolt insertion hole 411 is processed, with the upper projection 132 having a dome shape. The edge portion is lowered stepwise from the dome-shaped portion, and the pressing tab 310 in the longitudinal direction at the center of the upper protrusion portion of the dome shape, through which the bolt insertion hole 411 used for coupling with the fixing lower plate 220 is penetrated. The bolt insertion hole 413 through which the bolt 401b for pressing the bolt is fastened is penetrated, and the bolt insertion hole 413 is machined with a thread corresponding to the thread of the bolt 401b. A fixing upper plate 130 formed below the lower protrusion 134 inserted into the fixing lower plate 220 groove 221; A push tab 310 made of a plate-shaped steel material in which a spiral scratch 450 is continuously stacked on a contact surface with a fiber plate inserted into the fixing top plate 130 groove 311; A spiral scratch 450 is continuously stacked on the contact surface with the fiber board, and the groove 221 into which the lower protrusion 134 of the fixing upper plate 130 is inserted in both sides of the scratch 450 is longitudinally processed. In addition, a bolt insertion hole 411 for engaging with the fixing top plate 130 by a bolt 401 outside the groove 221 is penetrated, and the anchor bolt in the longitudinal direction at the outer edge portion of the bolt insertion hole 411. Fixing in which the fiber board is fixed between the push tab 310 and the fixing lower plate 220, which is composed of a fixing lower plate 220 made of a plate-shaped steel, through which a bolt insertion hole 412 for fixing to the concrete structure is penetrated. system. Constructing a prestressing reinforcement method for tensioning fiberboard and fixing it in concrete structures; A groove 311 into which the push tab 310 is inserted is processed, and a bolt insertion hole 413 into which a bolt 401b for pressing the push tab 310 is inserted into the center is machined, and the bolt insertion hole 413 is processed. A thread corresponding to the thread of the bolt 401b is machined, and an upper surface of which the bolt inserting hole 411 used for engagement with the fixing lower plate 210 is machined along the longitudinal edge thereof is flat. A fixing top plate 140 made of steel of a shape; A push tab 310 made of a plate-shaped steel material in which a spiral scratch 450 is continuously stacked on a contact surface with a fiber plate inserted into the fixing top plate 140 groove 311; A spiral scratch 450 is continuously stacked on the contact surface with the fiber board, and a bolt insertion hole 411 for coupling by the fixing top plate 140 and the bolt 401 is penetrated on both sides of the scratch 450. And a press tab comprising a fixing lower plate 210 made of a plate-shaped steel, through which a bolt insertion hole 412 for fixing to a concrete structure by an anchor bolt in a longitudinal direction at the outer edge portion of the bolt insertion hole 411 is formed. A fixing system in which a fiber board is fixed between the 310 and the fixing lower plate 210. Constructing a prestressing reinforcement method for tensioning fiberboard and fixing it in concrete structures; The upper surface is flat, and the lower surface, which is the acupressure part 111 which presses the fiber board 500, is processed into a curved surface (a circular arc shape), and the spiral scratches 450 are successively overlapped, and on both edges in the longitudinal direction. A fixing upper plate 110 made of steel, through which a bolt insertion hole 411 used for coupling with the fixing lower plate 210 is processed; A push tab 310 made of a plate-shaped steel material in which a spiral scratch 450 is continuously stacked on a contact surface with a fiber plate, which is placed under the curved surface of the fixing upper plate 110; A spiral scratch 450 is continuously stacked on the contact surface with the fiber board, and a bolt insertion hole 411 for joining the fixing top plate 110 and the bolt 401 is penetrated through both sides of the scratch 450. And a press tab comprising a fixing lower plate 210 made of a plate-shaped steel, through which a bolt insertion hole 412 for fixing to a concrete structure by an anchor bolt in a longitudinal direction at the outer edge portion of the bolt insertion hole 411 is formed. A fixing system in which a fiber board is fixed between the 310 and the fixing lower plate 210. A continuous overlapped helical scratch 450 formed on the surface of the fixing plate in contact with the fiber board; A method of shaping the scratch by horizontally moving the cutting chain fixing plate at high speed while rotating the cutting rod at a low speed in a lathe.