JP3207157B2 - Reinforcement method of independent columns by resin-cured carbon fiber board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing method using a resin-cured carbon fiber plate for improving the seismic performance of existing reinforced concrete columns such as pillars in a building and piloti, and more particularly, to a method for quickly and easily reinforcing the reinforcing method. The present invention relates to a method for reinforcing a reinforced concrete independent column using a resin-cured carbon fiber plate manufactured in advance and a method for manufacturing a resin-cured carbon fiber plate used for the reinforcing method.

[0002]

2. Description of the Related Art In recent years, as a method of seismic reinforcement of existing reinforced concrete independent columns following the Great Hanshin Earthquake, a steel plate winding method of winding a steel plate around a pillar of a structure such as a highway has been widely performed. Since a heavy steel plate is used, it is necessary to build a large scaffold, and since a welding operation is always required, a large working space and a large number of workers are required, and the working period is long.

On the other hand, a seismic retrofitting method in which a carbon fiber sheet is adhered to and hardened by an epoxy resin around a pillar in a building or an independent pillar made of reinforced concrete such as piloti is widely used. However, in this method, it is necessary to use a method in which the required number of sheets are sequentially attached after the epoxy resin is cured, so that the method often relies on manual work on site, and the work process is complicated and the resin is impregnated. In many cases, the on-site workers and residents are inconvenienced for a long period of time, such as the generation of gas generated at the site.

[0004]

In the above-mentioned conventional seismic retrofitting method for enhancing the seismic effect of existing reinforced concrete independent columns such as buildings, elevated railways, and highways, the steel plate winding method uses heavy steel plates. It has to be lifted with a crane or the like, so that it is necessary to construct a large scaffold, and since welding work is always required, a large work space and a large number of workers are required, and the work period is long.

[0005] In a seismic retrofitting method in which a carbon fiber sheet is attached with epoxy resin and hardened in a building or around a reinforced concrete pillar of Piloti, the required number of sheets are sequentially attached after the epoxy resin is hardened. Because the method is used, many of the methods rely on manual work on site, which inevitably requires a long construction period, complicates the work process, and causes problems in the work environment on site such as generation of gas generated when resin is impregnated. However, it was difficult to accurately check whether the required strength was sufficient for manual work on site, and there was a problem in the management of reinforcement strength.

The present invention has been made in view of the above-mentioned circumstances, and a reinforcement method for improving the seismic performance of existing reinforced concrete independent columns such as pillars in a building and piloti can be easily performed. It is possible to reduce the number of workers, reduce the number of workers, improve the working environment at the work site, is sanitary, and has a uniform reinforcing strength, and a method of reinforcing reinforced concrete independent columns and the resin used for that method It is an object of the present invention to provide a method for producing a cured carbon fiber board.

[0007]

According to the present invention, in order to achieve the above object, a hard plastic receiving plate and a spacer are arranged on the pillar surface in the height direction of the existing pillar, and the cross section of the pillar is formed. A pair of resin-cured carbon fiber plates formed in advance in abutting manner at the positions of a pair of receiving plates from both sides of the column, and attached to the receiving plate with an interval between the column surface and the The joint surface between the receiving plate and the resin-cured carbon fiber plate is sealed, and the extra length formed at the end of the resin-cured carbon fiber plate is overlaid and adhered to the opposite resin-cured carbon fiber plate with epoxy resin. This is a method of reinforcing an independent column using a resin-cured carbon fiber plate, which comprises injecting and curing a grout material into a gap between the surface and the resin-cured carbon fiber plate.

[0008] Further, a set of resin-cured carbon fiber plates pre-formed in accordance with the cross-sectional shape of the pillar, wherein a receiving plate made of hard plastic and a spacer are fixed to the pillar surface by anchors in the height direction of the existing pillar. Is fixed at a position of the receiving plate from both sides of the column at the position of the receiving plate, and at a distance from the column surface by a mechanical anchor inserted through a screw hole in the receiving plate. Sealing the joint surface of the board, further laminating the extra length formed at the end of the resin-cured carbon fiber board to the opposite resin-cured carbon fiber board with epoxy resin, and the upper and lower connection surfaces of the resin-cured carbon fiber board A resin-cured carbon fiber plate, characterized in that a reinforcing carbon fiber sheet is adhered to the resin, and after the resin is cured, a grout material is injected and cured from an injection hole into a gap between the column surface and the resin-cured carbon fiber plate. It is the reinforcement method of independent columns by.

Further, a grout injection protrusion and a screw hole protrusion are attached at predetermined positions to an inner mold having a U-shaped cross section which is slightly larger than the existing pillar in accordance with the cross-sectional shape of the existing pillar. A required number of carbon fiber sheets were laminated and pasted on the outer surface of the carbon fiber sheet with an epoxy resin leaving an extra length formed at the end of the carbon fiber sheet, and after the resin was cured, the carbon fiber sheet was removed from the inner mold to form a U-shaped cross section. A grout injection protrusion and a screw hole protrusion are attached to an inner mold having an L-shaped cross section, which is slightly larger in accordance with the cross-sectional shape of the existing column, at predetermined positions, and an outer surface of the inner mold is formed. A required number of carbon fiber sheets are overlapped and adhered to each other with epoxy resin leaving an extra length formed at the end of the carbon fiber sheet, and after resin curing, the carbon fiber sheet is removed from the inner mold and formed into an L-shaped cross section. And the existing pillar cross-section Attach the grout injection protrusions and the screw hole protrusions at predetermined positions on the inner mold frame, which is slightly larger in cross section according to the shape of the cross section, and attach the required number of carbon fiber sheets to the outer surface of the inner mold frame with epoxy resin. The carbon fiber sheet is laminated and pasted, leaving an extra length formed at one end of the carbon fiber sheet, and after curing of the resin, one corner having the extra length is cut off vertically and removed from the inner mold to form a rectangular cross section. A method for producing a resin-cured carbon fiber board characterized by the following.

[0010]

Next, an embodiment of the present invention will be described. First, a method for manufacturing a resin-cured carbon fiber plate used in the column reinforcing method according to the present invention will be described. A grout material injection hole projection and a screw hole projection are attached to predetermined positions in the vertical direction on the inner mold of the inner mold, and a carbon fiber sheet having fibers oriented sideways on the outer surface of the inner mold is coated with an epoxy resin. A required number of sheets are laminated and pasted, leaving an extra length formed at one or both ends of the fiber sheet. After the resin is cured, the resin sheet is removed from the inner mold and removed from the resin cured carbon having a U-shaped or L-shaped cross section. Manufacture fiberboard. Also, a required number of carbon fiber sheets are laminated and pasted on the outer surface of the square-shaped inner mold frame with an epoxy resin, leaving an extra length formed at one end of the carbon fiber sheet. The corners are cut vertically and removed from the inner mold to produce a resin-cured carbon fiber board having a rectangular cross section. When the carbon fiber sheet is overlapped and applied, the carbon fibers are pressed apart so that the carbon fibers arranged in the lateral direction of the carbon fiber sheet are not cut by the injection hole projections and the screw hole projections attached to the inner mold. Then, the carbon fiber sheet is stuck after the projection is inserted.

[0011] Next, using the resin-cured carbon fiber plate having the U-shaped or L-shaped cross section manufactured in this manner, to enhance the seismic performance of existing reinforced concrete independent columns in a building or in a piloti, the seismic reinforcement is used. To explain the construction method,
First, a rigid plastic receiving plate and a spacer are fixed to the pillar surface in the height direction of the pillar by an anchor, but in the case of a resin-cured carbon fiber plate having a U-shaped cross section, the center portion of the pillar and an L-shaped In the case of a resin-cured carbon fiber plate, a receiving plate is attached to each of the corners of the column, and then a pair of the U-shaped or L-shaped resin-cured carbon fiber plates are placed from both sides of the column. After fixing with a mechanical anchor inserted into the receiving plate from the screw hole of the fiberboard with a gap between the column surface and the receiving plate, the joint surfaces of the receiving plate and both resin-cured carbon fiber plates are sealed. Then, the excess length portion formed at the end of the resin-cured carbon fiber plate is laminated and attached to the opposite resin-cured carbon fiber plate with epoxy resin.

Further, in the case of the resin-cured carbon fiber plate having a rectangular shape, since one corner having an extra length is cut off vertically, the cut is pushed open to cover the column, and Similarly, after fixing to the receiving plate with a mechanical anchor inserted from the screw hole of the fiber plate with a space between the column surface and the post, the joint surface between the receiving plate and both resin-cured carbon fiber plates is sealed, and The extra length formed at one cut end of the resin-cured carbon fiber plate is pasted on the opposite resin-cured carbon fiber plate with epoxy resin.
On the other hand, a reinforcing carbon fiber sheet is attached to the upper and lower connection surfaces of the resin-cured carbon fiber plate provided in several steps on the outer periphery of the column, and after the resin is cured, the column cap and the column base are sealed, and the fiber plate is further injected by injection pressure. After the holding form for preventing the entanglement is attached to the outer periphery of the fiberboard, the grout material is injected and hardened from the injection hole into the gap between the column surface and the resin-cured carbon fiberboard, and the mounting operation is completed. Finally, after the grout material is hardened, the presser frame is removed, and if necessary, the fiberboard is surface-painted to complete the seismic retrofitting method.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for reinforcing a reinforced concrete independent column according to the present invention and a method for manufacturing a resin-cured carbon fiber board used in the reinforcing method will be described with reference to the drawings. FIG. 1 is a perspective view of a resin-cured carbon fiber plate according to the present embodiment. FIG. 1A shows a case where extra-long portions are formed at both ends.
FIG. 2 is a plan view of a state in which a required number of carbon fiber sheets are overlapped with an epoxy resin on the outer surface of the inner mold frame having a U-shaped cross section, with an extra length left when an extra length portion is formed at one end. .

The resin-cured carbon fiber plate 1 shown in FIG. 1 is formed by laminating a required number of carbon fiber sheets 3 on the outer surface of an inner mold frame 2 having a U-shaped cross section with an epoxy resin as shown in FIG. At the end of the carbon fiber sheet thus formed and laminated, an extra length portion 4 of only carbon fiber not coated with epoxy resin is formed. The grout material injection hole 5 and the screw hole 6 formed in the resin-cured carbon fiber plate 1 are formed by the grout material injection hole protrusion and the screw hole protrusion (not shown) provided on the outer surface of the inner mold frame 2. Formed at the time of lamination.

FIGS. 3 and 4 are a side view and a sectional view, respectively, in which a receiving plate 8 made of hard plastic and a spacer 9 are fixed to the surface of the column 7 by an anchor 10 in the height direction of the column 7 to be subjected to seismic reinforcement. FIG. 5 shows a state in which one of the U-shaped cross-section resin-cured carbon fiber boards 1 is attached to the column 7 to be reinforced, and FIG. 6 shows a procedure for attaching the pair of resin-cured carbon fiber boards 1.

In FIG. 6, (a) is a plan view showing a state in which a receiving plate 8 is fixed to a pillar 7 to be reinforced by an anchor 10, and (b) is a pair of resin-cured carbon fiber plates 1 having a U-shaped cross section. , 1A are brought into contact with each other at the position of the receiving plate 8 from both sides of the pillar 7, and the receiving plate 8 is provided with screw holes 4 of the fiberboard 1.
A mechanical anchor 11 inserted from above is fixed while maintaining a gap S between the column surface and the column surface, and the joining surfaces of the receiving plate 8 and the resin-cured carbon fiber plates 1 and 1A are sealed 12 respectively. A state in which the excess length portion 4 formed at the end of the carbon fiber plate 1 is overlapped on the opposed resin-cured carbon fiber plate 1A, and (d) shows the overlapped excess length portion 4 on the mating resin cured carbon fiber plate 1A. The state in which they are overlaid with epoxy resin is shown. FIG. 7 shows a reinforcing carbon fiber sheet 14 provided on the upper and lower connection surfaces 13 of the resin-cured carbon fiber plates 1 and 1 when the outer periphery of the column 7 is provided in a plurality of stages vertically.
Indicates a pasted state.

FIGS. 8 to 10 show another embodiment. FIG. 8 is a perspective view of an L-shaped resin-cured carbon fiber plate 15 and FIG. 9 is a plan view showing an attached state thereof. FIG. 10 shows the mounting procedure. The resin-cured carbon fiber plate 15 shown in FIG. 8 is formed by laminating a required number of carbon fiber sheets with epoxy resin on the outer surface of an inner mold having an L-shaped cross section in the same manner as in FIG. At the end of the carbon fiber sheet, a surplus portion 16 of only carbon fiber not coated with epoxy resin is formed. Like the resin-cured carbon fiber plate 1 having a U-shaped cross section, the grout material injection hole 17 and the screw are formed. A hole 18 is provided.

FIG. 9 shows a state in which the L-shaped resin cured carbon fiber board 15 is attached to the column 7 to be reinforced. The procedure for actually attaching the L-shaped resin cured carbon fiber board 15 to the pillar 7 is shown. Is shown in FIG. In FIG.
(A) shows a pair of the L-shaped cross-section resin-cured carbon fiber plates 15 and 15A on a curved receiving plate 19 fixed to the corner 7A of the column 7 by the anchor 10 from both sides of the column 7. At the position of 19, the butt state is set, and the receiving plate 19
Are fixed with a mechanical anchor inserted from the screw hole 18 of each of the carbon fiber plates 15 and 15A while maintaining an interval S between the carbon fiber plates 15 and 15A and the extra length portion 16A of the carbon fiber plate 15A.
(B) is a state in which the carbon fiber is attached to the curved receiving plate 19, and (b) shows the extra-length portion 16 formed at the end of the resin-cured carbon fiber plate 15.
(C) shows a state where the carbon fibers of the overlapped excess length portion 16 are overlaid on the other resin cured carbon fiber plate 15A with an epoxy resin.

According to the above embodiment, the laminating operation of the carbon fiber sheet can be performed quickly and accurately, the mass production in the factory can be performed, the operation can be performed hygienically, and the product strength can be kept uniform. be able to. In addition, since the specific gravity of the resin-cured carbon fiber plate is about の of that of the steel plate, it is lightweight, bulky, and easily transported to the reinforcing site. In addition, the work time at the reinforcement site can be greatly reduced, the amount of gas generated is extremely small, the work environment at the site can be significantly improved, and sanitary, and the reinforcing strength of the column is much higher than steel wire. Because it is used, it is several times larger than the reinforcement wrapped in steel plate, so it prevents the crack expansion of the concrete caused by the vibration of the reinforced concrete independent columns and the shear failure of the reinforced concrete independent columns. Can be.

[0020]

According to the present invention described above, a resin-cured carbon fiber plate having a U-shaped or L-shaped cross section is formed in advance by filling an inner mold having a U-shaped or L-shaped cross section with an injection hole for grout material. Attach the projection and the projection for the screw hole at a predetermined position, and paste a required number of carbon fiber sheets on the outer surface of the inner mold frame with an epoxy resin, leaving an extra length formed at the end of the carbon fiber sheet, and apply the resin. Since it is removed from the inner mold after hardening and manufactured, the carbon fiber sheet to be bonded can be positioned using the projection for the injection hole and the projection for the screw hole. , And the product strength can be kept uniform.
In the case of a resin-cured carbon fiber board with a rectangular cross section, one corner with an extra length is cut off vertically, so it can be easily installed to push open the cut and cover the column, Production is possible and the product strength is high, and these resin-cured carbon fiber boards are lightweight, bulky and easy to transport to the reinforcement site.

Further, the reinforcing method of the independent columns made of reinforced concrete according to the present invention using these resin-cured carbon fiber boards is simple in the work of mounting the fiber boards on site, and simply requires the extra length of the resin-cured carbon fiber boards. The entire construction period can be significantly shortened because the parts are simply superimposed with epoxy resin on the opposing fiberboard, and the amount of gas generated when the resin is impregnated on it is extremely small, so the work environment on site can be significantly improved. It is hygienic. In addition, the reinforcement strength of the columns is several times greater than that of steel-plated reinforcement because carbon fiber, which has much higher tensile strength than steel wire, is used, so concrete crack expansion caused by vibration of independent reinforced concrete columns due to earthquakes and the like. To prevent the collapse of the independent columns made of reinforced concrete by shearing.

[Brief description of the drawings]

FIG. 1 is a perspective view of a resin-cured carbon fiber plate of the present embodiment, where (a) shows a case where extra-long portions are formed at both end portions, and (b)
Is a case where the extra length is formed at one end.

FIG. 2 is a plan view showing a state in which the carbon fiber plate of the present embodiment is overlaid and adhered to the outer surface of an inner mold having a U-shaped cross section, leaving an extra length.

FIG. 3 is a side view of a state in which a receiving plate and a spacer are fixed in a height direction of a pillar according to the present embodiment.

FIG. 4 is a sectional view of FIG. 3;

FIG. 5 is a cross-sectional view showing a state in which one of the U-shaped resin cured carbon fiber plates is attached to a pillar to be reinforced.

6A and 6B are explanatory views showing a procedure for attaching a pair of resin-cured carbon fiber plates to a column, wherein FIG. 6A is a state in which a receiving plate is fixed to the column by an anchor, and FIG. 6B is a pair of the U-shaped cross sections. The resin-cured carbon fiber plate is fixed in abutting condition at the position of the receiving plate, and the joint surfaces are sealed, respectively. (C) shows the resin-cured carbon fiber facing the extra length formed at the end of the resin-cured carbon fiber plate. (D) is a plan view showing a state where the excess length portion is overlaid on the other resin-cured carbon fiber plate with an epoxy resin.

FIG. 7 is a side view showing a case where the present embodiment is provided in a plurality of stages vertically on the outer periphery of a pillar.

FIG. 8 is a perspective view of another embodiment.

FIG. 9 is a cross-sectional view showing a state in which a resin-cured carbon fiber board having an L-shaped cross section is mounted on a diagonal line of a pillar.

FIG. 10 is an explanatory view showing a procedure for attaching a pair of L-shaped carbon fiber plates to a corner of a column, and (a) shows a pair of the L-shaped carbon fiber plates at a position of a curved receiving plate fixed to the corner of the column. The resin-cured carbon fiber plate having an L-shaped cross section is brought into abutting state, and the extra length of the carbon fiber plate is attached to the curved receiving plate, and (b) is the extra length of the resin-cured carbon fiber plate. (C) is a plan view showing a state in which the portion is overlapped on the opposed resin-cured carbon fiber plate, and (c) is a state in which the overlapped extra-length carbon fiber is overlaid and attached to the other resin-cured carbon fiber plate using an epoxy resin. .

[Explanation of symbols]

 Reference Signs List 1,15 Resin-cured carbon fiber plate 2 Inner frame 3 Carbon fiber sheet 4,16 Extra length 5,17 Injection hole 6,18 Screw hole 7 Column to be reinforced 7A Column corner 8,19 Receiving plate 9 Spacer 10, DESCRIPTION OF SYMBOLS 11 Anchor 12 Seal 13 Upper and lower connection surface 14 Carbon fiber sheet for reinforcement S interval

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Osamu Isobata 1-3-2 Kogane Kiyoshigaoka, Matsudo City, Chiba Prefecture (72) Inventor Hiroshi Taira, 2-4-8 Miyoshi, Koto-ku, Tokyo Miyoshi Building ( 72) Inventor Hiroyoshi Yoshino 225 Terao, Kawagoe-shi, Saitama (56) References JP-A-10-25856 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04G 23/02

Claims (6)

(57) [Claims] A hard plastic receiving plate and a spacer are arranged on the surface of a column in the height direction of an existing column, and a pair of resin-cured carbon fiber plates formed in advance in accordance with the cross-sectional shape of the column are provided. After being mounted at a position of a pair of receiving plates from both sides of the column at the position of a pair of receiving plates, and with a space provided between the receiving plate and the column surface, the joint surface between the receiving plate and the resin-cured carbon fiber plate is sealed, In addition, the excess length formed at the end of the resin-cured carbon fiber plate is overlaid on the opposite resin-cured carbon fiber plate with epoxy resin, and after the resin is cured, grout is applied to the gap between the pillar surface and the resin-cured carbon fiber plate. A method of reinforcing independent columns using a resin-cured carbon fiber plate, characterized by injection hardening. 2. A set of resin-cured carbon fiber plates pre-formed according to the cross-sectional shape of a pillar, wherein a receiving plate made of hard plastic and a spacer are fixed to the pillar surface by anchors in the height direction of the existing pillar. Is fixed at a position of the receiving plate from both sides of the column at the position of the receiving plate, and at a distance from the column surface by a mechanical anchor inserted through a screw hole in the receiving plate. Sealing the joint surface of the board, further laminating the extra length formed at the end of the resin-cured carbon fiber board to the opposite resin-cured carbon fiber board with epoxy resin, and the upper and lower connection surfaces of the resin-cured carbon fiber board A resin-cured carbon fiber sheet characterized in that a reinforcing carbon fiber sheet is attached to the resin cured resin, and grout material is injected and cured from the injection hole into the gap between the pillar surface and the resin-cured carbon fiber sheet after the resin is cured. Reinforcement method for independent columns. 3. A grout injection protrusion and a screw hole protrusion are mounted at predetermined positions on an inner mold having a U-shaped cross section which is slightly larger in accordance with the cross-sectional shape of the existing pillar. A required number of carbon fiber sheets were laminated and pasted on the outer surface of the carbon fiber sheet with an epoxy resin leaving an extra length formed at the end of the carbon fiber sheet, and after the resin was cured, the carbon fiber sheet was removed from the inner mold to form a U-shaped cross section. A method for producing a resin-cured carbon fiber board, characterized by: 4. A projection for an injection hole and a projection for a screw hole of a grout material are attached at predetermined positions to an inner mold having an L-shaped cross section, which is slightly larger in accordance with the cross-sectional shape of the existing column. A required number of carbon fiber sheets were laminated and pasted on the outer surface of the carbon fiber sheet with an epoxy resin, leaving an extra length formed at the end of the carbon fiber sheet. After curing of the resin, the carbon fiber sheet was removed from the inner mold and formed into an L-shaped cross section. A method for producing a resin-cured carbon fiber board, characterized by: 5. A grout injection hole projection and a screw hole projection are mounted at predetermined positions on an inner mold frame having a substantially rectangular cross section, which is slightly larger in accordance with the cross-sectional shape of the existing pillar, and A required number of carbon fiber sheets are overlaid and adhered to the outer surface of the carbon fiber sheet with an epoxy resin, leaving an extra length formed at one end of the carbon fiber sheet. A method for producing a resin-cured carbon fiber plate, wherein the resin-cured carbon fiber plate is formed in a rectangular cross section by removing the same from a substrate. 6. When laminating a carbon fiber sheet on the outer surface of the inner mold frame with an epoxy resin, be careful not to cut the carbon fibers arranged in the lateral direction of the carbon fiber sheet by the projection for the injection hole or the projection for the screw hole. The method for producing a resin-cured carbon fiber board according to any one of claims 3 to 5, wherein the carbon fiber sheet is pasted after the carbon fibers are pressed and inserted through the protrusions.