JP5435832B1 - Seismic reinforcement members for concrete structures and seismic reinforcement methods for concrete structures - Google Patents

Abstract

An object of the present invention is to provide a seismic reinforcing member for a concrete structure and a seismic reinforcing method for a concrete structure that can be easily positioned with a simple structure, can be accurately positioned, and can significantly improve seismic performance. With the goal.
In a seismic reinforcing member 1 for a concrete structure in which a pair is opposed to each other and arranged around a column or beam of a concrete structure 8 with a gap and filled with a hardener, the concrete structure is integrated with the concrete structure. A body portion 2 having a U-shaped or semicircular cut surface, upper and lower flange portions 3 and 4 formed so as to extend horizontally inwardly above and below the body portion, and a vertical portion 5 formed between the upper and lower flange portions. And a plurality of positioning claw members 7 extending vertically upward from the front end of the upper flange portion.
[Selection] Figure 2

Description

  The present invention relates to a concrete structure seismic reinforcement member used for seismic reinforcement of columns and beams of a concrete structure and a concrete structure seismic reinforcement method using the same.

  Reinforced concrete structures have been greatly damaged by past earthquakes. As a cause of the damage, shear failure of concrete structures has been pointed out. It has been found that it is optimal to effectively constrain the concrete structure to prevent shear failure of the concrete structure and to ensure stability and stickiness of the restoring force characteristics.

  Based on this idea, the steel structure is installed around the outer periphery of the pillars and beams of the concrete structure, and the steel structure is installed on the outer periphery of the concrete structure. An anti-seismic reinforcement structure for a concrete structure is proposed in which a mortar is filled between a rolled steel plate and a concrete structure and solidified.

JP 2000-265680 A JP 2006-63608 A

  However, the seismic reinforcement structure that affixes the fiber sheet to the concrete member, when the concrete member is subjected to a large stress, the fiber sheet is peeled off from the concrete surface unless the adhesion performance with the concrete is sufficient, and the strength can be exhibited. Has the problem of not being able to.

  In addition, the seismic reinforcement structure that winds around the concrete structure with a steel plate and fills and solidifies the mortar between the steel plate and the concrete structure is assembled in the factory, and the joint is welded. Therefore, welding work is difficult because of work in a narrow space, and there is a problem that poor welding is likely to occur.

  The present invention provides a seismic reinforcing member for a concrete structure that solves the problems of the prior art, has a simple structure, is easy to assemble, can be positioned accurately, and can significantly improve seismic performance. The purpose is to provide a seismic reinforcement method for concrete structures.

In order to solve the above problems, the concrete structure seismic reinforcing member of the present invention is arranged around a column or beam of a concrete structure by facing a pair and arranging them in a plurality of longitudinal or lateral directions. In a seismic reinforcing member for a concrete structure which is arranged with a gap and is filled with a hardener and integrated with a concrete structure, a horizontal cut surface is a U-shaped or semi-circular main body, and above and below the main body comprising upper and lower flange portions formed to extend horizontally, and a vertical portion formed between the upper and lower flange portions, and a plurality of positioning pawl member extending upper perpendicularly from the front end of the upper flange portion, said When a plurality of openings are formed in the upper and lower flange portions, and the plurality of concrete structure reinforcing members are continuously arranged in the vertical direction or the horizontal direction, the openings of the adjacent upper and lower flange portions are matched. It is characterized by forming .

  The concrete structure seismic reinforcing member of the present invention is characterized in that the concrete structure seismic reinforcing member is made of steel or reinforced resin.

  Moreover, the concrete structure seismic reinforcement method of the present invention arranges the pair of concrete structure seismic reinforcement members according to any one of claims 1 to 3 so as to face each other so as to surround the columns or beams of the concrete structure, When arranging vertically or horizontally continuously, place the concrete structure seismic reinforcement members adjacent to each other by 90 degrees and surround the concrete structure with a concrete structure seismic reinforcement member. The gap between the structure and the concrete structure seismic reinforcing member is filled with a hardener and solidified to integrate the concrete structure and the concrete structure seismic reinforcing member.

  The concrete structure seismic reinforcement method of the present invention is characterized in that reinforcing bars are arranged in the gap between the concrete structure and the concrete structure seismic reinforcement member.

  Moreover, the concrete structure seismic reinforcement method of the present invention is characterized in that a high-tensile fiber sheet is wound around and fixed to the outer periphery of a concrete structure seismic reinforcement member disposed around the concrete structure via an adhesive.

  In addition, the concrete structure seismic reinforcement method according to the present invention is characterized in that a fiber-reinforced mortar is laminated on the high-tensile fiber sheet to finish the surface.

  Moreover, the concrete structure seismic reinforcement method of the present invention is characterized in that the hardener is a high-strength fiber reinforced mortar containing organic fibers and steel fibers.

A pair of them face each other and they are arranged in a row in the vertical or horizontal direction with a gap around the pillar or beam of the concrete structure, filled with a hardener and integrated with the concrete structure. In the concrete structure seismic reinforcing member, a horizontal cut surface between a U-shaped or semicircular main body, an upper and lower flange formed so as to extend horizontally inwardly above and below the main body, and the upper and lower flanges And a plurality of positioning claw members extending vertically upward from the front end of the upper flange portion, and forming a plurality of openings in the upper and lower flange portions, and a plurality of concrete structure reinforcing members When arranging vertically and horizontally continuously, the openings of adjacent upper and lower flanges are formed so that they coincide with each other. It is possible to accurately position the adjacent concrete structure reinforcement members with the positioning claw members that are actually aligned and arranged on the upper flange part, and the upper and lower flange parts and the vertical part are integrated with the concrete structure with a hardener. When the hardener is filled between the concrete structure and the concrete structure reinforcement member, the opening serves as a passage for air to escape to prevent the formation of a cavity when the hardener solidifies. It becomes possible.
By making the seismic reinforcement member of a concrete structure made of steel or reinforced resin, it is possible to manufacture at low cost because it is a material that is easily available and easy to mold.
When a pair of concrete structure seismic reinforcement members are placed so as to face each other around a pillar or beam of a concrete structure, and when they are arranged in series in the vertical or horizontal direction, the direction of the adjacent concrete structure seismic reinforcement members Is placed 90 degrees apart, and the concrete structure is surrounded by a concrete structure seismic reinforcement member. After fixing the concrete structure seismic reinforcement member, between the concrete structure and the concrete structure seismic reinforcement member By filling the gap between the hardener and solidifying the concrete structure and the concrete structure seismic reinforcement member, the horizontal upper and lower flange parts are aligned in a vertical or horizontal direction, and the upper flange is further aligned. It is possible to accurately position the concrete structure reinforcing member adjacent to the positioning claw member arranged in the section. It is possible to efficiently implement the assembly work. Further, when the upper and lower flange portions and the vertical portion are integrated with the concrete structure with a hardener, it functions as a reinforcing rib, and it is possible to provide a seismic construction method with high seismic performance.
Seismic performance is further improved by placing reinforcing bars in the gap between the concrete structure and the seismic reinforcement member.
By wrapping and fixing high-tensile fiber sheets around the periphery of concrete structure seismic reinforcement members placed around the concrete structure with an adhesive, without using means such as welding to fix the concrete structure earthquake resistance reinforcement The seismic performance can be improved and the fixing work can be easily performed.
By laminating a fiber-reinforced mortar on a high-tensile fiber sheet and finishing the surface, it is possible to improve the appearance and improve the seismic performance.
By using high-strength fiber reinforced mortar containing organic fiber and steel fiber as the curing agent, it has fluidity and self-filling properties even in narrow gaps, and the hardened concrete structure and concrete structure seismic reinforcement member are firmly integrated. Can be realized.

(A) (b) It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. (A) (b) It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. (A) (b) It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention.

  An embodiment of the present invention will be described with reference to the drawings. 1A, 1B, and 2 are views showing an embodiment of a concrete structure reinforcing member of the present invention.

  The concrete structure reinforcing member 1 of this embodiment is used for seismic reinforcement of a column or beam of a concrete structure having a rectangular cross section. The concrete structure reinforcing member 1 includes a main body 2 having a U-shaped horizontal cut surface. An upper flange portion 3 and a lower flange portion 4 are formed on the upper and lower sides of the main body portion 2 so as to extend horizontally inward with a constant width. Vertical portions 5 are formed on both side ends of the upper flange portion 3, the lower flange portion 4, and the main body portion 2.

  Openings 6 are formed in the upper flange portion 3 and the lower flange portion 4 at a predetermined interval. The formation position of the opening 6 will be described later. A plurality of positioning claw members 7 are arranged at the front end of the upper flange portion 3 so as to extend vertically from the surface of the upper flange portion 3 upward. The operation of the positioning claw member 7 will be described later.

  FIG. 2 shows a concrete structure 8 and concrete structure reinforcing members 1 and 1 with a pair of concrete structure reinforcing members 1 facing each other around a column or beam of a concrete structure 8 having a rectangular cross section so that the vertical portions 5 are in surface contact with each other. It is a figure which shows the state in which the fixed space | gap was formed between them. The concrete structure reinforcing member 1 is made of a material that has a certain strength such as steel or reinforced resin, is easily available, and is easy to mold.

  3 (a), 3 (b), and 4 are views showing another embodiment of the concrete structure reinforcing member of the present invention.

  The concrete structure reinforcing member 1a of this embodiment is used for seismic reinforcement of a pillar or beam of a concrete structure having a circular cross section. The concrete structure reinforcing member 1a includes a main body 2a having a U-shaped horizontal cut surface. An upper flange portion 3a and a lower flange portion 4a are formed on the upper and lower sides of the main body portion 2a so as to extend horizontally inward with a constant width. Vertical portions 5a are formed at both side ends of the upper flange portion 3a, the lower flange portion 4a, and the main body portion 2a.

  Openings 6a are formed at predetermined intervals in the upper flange portion 3a and the lower flange portion 4a. The formation position of the opening 6a will be described later. A plurality of positioning claw members 7a are arranged at the front end of the upper flange portion 3a so as to extend vertically from the surface of the upper flange portion 3a. The arrangement position and operation of the positioning claw member 7a will be described later.

  FIG. 4 shows a concrete structure 8a and a concrete structure reinforced by arranging a pair of concrete structure reinforcing members 1a around each column or beam of a concrete structure 8a having a circular cross section so that the vertical portions 5 face each other. It is a figure which shows the state in which the fixed space | gap was formed between the members 1a and 1a.

  5 (a) and 5 (b) are diagrams showing an embodiment of seismic reinforcement of the concrete structure 8 using the concrete structure reinforcing member 1 shown in FIGS. 1 (a) and 1 (b). In this embodiment, a concrete column having a rectangular cross section is taken as an example of the concrete structure 1 and the seismic reinforcement member 1 is connected continuously in the vertical direction. In the case of a concrete beam, the concrete structure is supported while being supported by a support member. The seismic reinforcement member 1 is continuously arranged in the lateral direction. When the cross section of the concrete structure is circular, a concrete structure seismic reinforcement member 1a shown in FIGS. 3 (a) and 3 (b) is used.

  First, a deteriorated portion or the like of the surface of the concrete structure 8 to be seismically reinforced is removed by picking work, and the surface of the concrete structure is made rough. The hanging depth shall be within the depth of cover concrete. Thereafter, reinforcing bars 9 are arranged around the concrete structure 8.

  The concrete structure seismic reinforcement member 1 is arranged around the concrete structure 8 in which the reinforcing bars 9 are arranged around so that the vertical portions 5 face each other. In this embodiment, since the concrete structure 8 is a concrete pillar, the concrete structure seismic reinforcement member 1 is continuously provided in the vertical direction. The second-stage concrete structure seismic reinforcing member 1 is laminated on the first-stage concrete structure seismic reinforcing member 1. The second-stage concrete structure seismic reinforcement member 1 is disposed 90 degrees away from the first-stage concrete structure seismic reinforcement member. The reason why the layers are stacked in order by changing the direction by 90 degrees is to prevent a reduction in resistance to bending moment during an earthquake by preventing the joints between the vertical parts from being aligned in a row.

  FIG. 7 shows that a single concrete structure seismic reinforcement member 1 is placed on a pair of concrete structure seismic reinforcement members 1 arranged so as to face each other. It is a figure which shows the state laminated | stacked by changing direction. As shown in FIG. 7, the positioning claw member 7 disposed at the front end of the upper flange portion 3 of the first-stage concrete structure seismic reinforcement member 1 is connected to the lower flange portion 4 of the second-stage concrete structure seismic reinforcement member 1. The stacking position of the seismic reinforcing member 1 of the second stage concrete structure is accurately positioned in contact with the front end.

  When the second-stage concrete structure seismic reinforcement member 1 is laminated on the first-stage concrete structure seismic reinforcement member 1 by changing the orientation by 90 degrees, the formation position of the opening 6 of the upper and lower flange portions 3 and 4 is 1 An opening 6 formed in the upper flange portion 3 of the stage concrete structure seismic reinforcing member and an opening 6 formed in the lower flange portion 4 of the second stage concrete structure seismic reinforcing member 1 are formed to communicate with each other. The After the multi-stage concrete structure seismic reinforcement member 1 is laminated so as to surround the concrete structure 8 and the concrete structure seismic reinforcement member 1 is fixed, the gap between the concrete structure 8 and the concrete structure seismic reinforcement member is fixed. Are filled with a curing agent, cured and integrated. At that time, since the opening 6 communicates, air in the curing agent is released, and generation of cavities in the curing agent after curing is prevented.

FIG. 6 is a view showing an embodiment in which the concrete structure seismic reinforcing member 1 laminated around the concrete structure 8 is fixed. In this embodiment, a high-tensile fiber sheet 10 is wound around and fixed to a concrete structure seismic reinforcement 1 via an adhesive. Since no means such as welding is used for fixing the seismic reinforcing member 1 for the concrete structure, the fixing work is easy, and the strength of the seismic reinforcing member 1 for the concrete structure after fixing is increased. As a result, the seismic performance is improved. After the high-strength fiber sheet 10 has been wound and fixed, a fiber reinforced mortar is laminated thereon to finish the surface. By finishing the surface with fiber reinforced mortar, it is possible to improve the appearance and improve the seismic performance.

  As a hardener filled in the gap between the concrete structure 1 and the concrete structure seismic reinforcement member 1, a hardener excellent in fluidity and self-filling properties and having high strength after curing is desired. One of them is mortar of high-strength fiber reinforced concrete containing steel fiber and organic fiber. The upper and lower flange portions 3 and 4 and the vertical portion 5 of the laminated concrete structure seismic reinforcement member 1 function as reinforcing ribs, and are integrated with the concrete structure 8 by hardening of the curing agent to significantly improve the seismic performance. Is possible.

  As described above, according to the concrete structure seismic reinforcing member of the present invention and the concrete structure seismic reinforcing method using the same, the horizontal upper and lower flange portions are surely aligned when arranged in the vertical direction or the horizontal direction, Since the positioning claw member disposed on the upper flange portion can accurately position the adjacent concrete structure reinforcing member, the assembling work can be performed efficiently. Further, when the upper and lower flange portions and the vertical portion are integrated with the concrete structure with a hardener, it functions as a reinforcing rib, and it is possible to provide a seismic construction method with high seismic performance.

  DESCRIPTION OF SYMBOLS 1, 1a: Concrete structure reinforcement member, 2, 2a: Main-body part, 3, 3a: Upper flange part, 4, 4a: Lower flange part, 5, 5a: Vertical part, 6, 6a: Opening, 7, 7a: Positioning claw member, 8, 8a: Concrete structure, 9: Rebar, 10: High-tensile fiber sheet

Claims (7)

A pair of them face each other and they are arranged in a row in the vertical or horizontal direction with a gap around the pillar or beam of the concrete structure, filled with a hardener and integrated with the concrete structure. In the concrete structure seismic reinforcing member, a horizontal cut surface between a U-shaped or semicircular main body, an upper and lower flange formed so as to extend horizontally inwardly above and below the main body, and the upper and lower flanges A vertical portion to be formed, and a plurality of positioning claw members extending vertically upward from the front end of the upper flange portion,
A plurality of openings are formed in the upper and lower flange portions, and when the plurality of concrete structure reinforcing members are continuously arranged in the vertical direction or the horizontal direction, the openings of adjacent upper and lower flange portions are formed so as to coincide with each other. Seismic reinforcement members for concrete structures.   The concrete structure seismic reinforcing member according to claim 1 or 2, wherein the concrete structure seismic reinforcing member is made of steel or reinforced resin. A pair of concrete structure seismic reinforcement members according to claim 1 or 2 are arranged so as to face each other so as to surround the pillars or beams of the concrete structure, and are arranged adjacent to each other in the vertical direction or the horizontal direction. Place the seismic reinforcement member in a 90-degree direction, surround the concrete structure with a gap between the concrete structure seismic reinforcement member, and fix the connected concrete structure reinforcement member. A concrete structure seismic reinforcement method characterized by integrating a concrete structure and a concrete structure seismic reinforcement member by filling a space between the concrete structure seismic reinforcement members with a hardening agent and solidifying.   The concrete structure seismic reinforcement method according to claim 3, wherein reinforcing bars are arranged in the gap between the concrete structure and the concrete structure seismic reinforcement member.   The concrete structure seismic reinforcement method according to claim 3 or 4, wherein a high-strength fiber sheet is wound around and fixed to an outer periphery of a concrete structure seismic reinforcement member arranged around the concrete structure via an adhesive.   The concrete structure earthquake-proof reinforcement method according to any one of claims 3 to 5, wherein a fiber-reinforced mortar is laminated on the high-tensile fiber sheet to finish the surface.   The concrete structure seismic reinforcement method according to any one of claims 3 to 6, wherein the curing agent is a high-strength fiber reinforced mortar containing organic fibers and steel fibers.

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