JP2016050390A - Seismic reinforcement method and seismic reinforcement structure for concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seismic reinforcement method and a seismic reinforcement structure for a concrete structure of a simple structure that require chipping of a lesser portion of a concrete surface, do not damage inner reinforcing bars, and capable of tightly fixing a concrete mold reinforcement part with the concrete structure.SOLUTION: A seismic reinforcement method for a concrete structure comprises the following steps for: forming a plurality of recesses by chipping a surface of a concrete structure 1 within a concrete thickness; fixing a connecting plate 4 to the plurality of recesses, the connecting plate having a thickness that equals a chipping depth and having a female screw hole formed; installing a reinforcing member 5 around the concrete structure 1, leaving an interval; connecting the reinforcing member 5 with the connecting plate 4, by screwing a fixing screw 6 from the reinforcing member 5 into the female screw hole of the connecting plate 4; and unifying the reinforcing member 5 with the concrete structure 1 by filling a solidification material in a gap between the concrete structure 1 and the reinforcing member 5 and solidifying the solidification material.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seismic reinforcement method for concrete structures such as buildings and bridges and a seismic reinforcement structure for concrete structures.

  For seismic reinforcement of concrete structures such as buildings and bridges, a reinforcing part is placed with a certain gap around the periphery of the concrete structure, and a solidified material such as concrete mortar is filled in the gap between the reinforcing part and the concrete structure Then, a seismic reinforcement method for a concrete structure in which the concrete structure and the reinforcing member are integrated is proposed.

  In Patent Document 1, as a seismic reinforcement method for a concrete structure, a surface deteriorated portion of the concrete structure is suspended within the range of the cover concrete, and reinforcing members are arranged at regular intervals around the surface so that the reinforcing member and the surface are connected. A concrete structure seismic reinforcement method is disclosed in which high strength concrete is filled in a gap between the concrete structures and solidified to integrate the reinforcing member and the concrete structure.

  Further, in Patent Document 2, a seismic reinforcement part is wound around a reinforced concrete structure, a plurality of anchors are fixed from the seismic reinforcement part to the inside of the internal reinforcing bar, and the reinforced concrete structure and the seismic reinforcement part are firmly integrated. An earthquake-proof reinforcement method for concrete structures is disclosed.

  Also, the surface of the concrete structure is suspended until the internal rebar is exposed, the tip of the anchoring part extending from the reinforcing member is positioned inside the internal rebar, and a solidifying material such as concrete mortar is placed in the gap between the concrete structure and the reinforcing member. A seismic reinforcement method for a concrete structure in which the concrete structure and the reinforcing member are integrated by being filled and solidified has been proposed.

JP 2013-119513 A JP 2002-332750 A

  However, in the seismic reinforcement method for a concrete structure in which a solid structure such as concrete mortar is filled in the gap between the reinforcing member and the concrete structure and solidified to integrate the concrete structure and the reinforcing member, the reinforcing member and the concrete structure There is a problem that the integration of objects is only solidification of concrete and the fixing force is not sufficient.

  In the seismic reinforcement method for concrete structures in which a plurality of anchors are anchored from the reinforcing member inside the internal reinforcing bar and the reinforced concrete structure and the seismic reinforcing part are firmly integrated, the anchor is driven inside the internal reinforcing bar of the concrete structure. There is a risk of damaging the internal rebar.

  Also, the surface of the concrete structure is suspended until the internal rebar is exposed, the tip of the anchoring portion extending from the reinforcing member is positioned inside the internal rebar, and a hardening material such as concrete mortar is placed in the gap between the concrete structure and the reinforcing member. In the seismic reinforcement method for a concrete structure in which the concrete structure and the reinforcing member are integrated by filling and solidifying, there is a problem that a lot of time is required for the concrete surface lifting work.

  The present invention solves the problems of the prior art. The structure is simple, the concrete surface is hardly hung, and the reinforcing member and the concrete structure can be firmly fixed without damaging the internal reinforcing bars. It aims at providing a concrete structure seismic reinforcement method and a concrete structure seismic reinforcement structure.

  In order to solve the above problems, the concrete structure seismic reinforcement method of the present invention includes a step of forming the plurality of recesses by suspending the surface of the concrete structure at a depth in the covering concrete, and the plurality of recesses having a thickness. A step of fixing a connecting plate having a female screw hole formed at a hanging depth; a step of arranging a reinforcing member at a predetermined interval around the concrete structure; and a fixing screw from the reinforcing member to the female screw hole of the connecting plate And a step of connecting the reinforcing member and the connecting plate, and a step of filling the gap between the concrete structure and the reinforcing member with a solidifying material to solidify the solidifying material and integrating the reinforcing member and the concrete structure; It is characterized by providing.

  Moreover, the concrete structure seismic reinforcement method of the present invention is characterized in that a spacing member in which a hole for inserting a fixing bolt is formed between the connecting plate and the reinforcing member is disposed.

  Further, the seismic retrofitting method for a concrete structure according to the present invention includes a step of suspending the surface of the concrete structure at a depth in the covering concrete, forming a plurality of recesses, and a plurality of recesses having the same thickness as the suspending depth. Fixing the connecting plate formed with holes, forming a butyl rubber film on the surface of the concrete structure, placing a reinforcing material around the concrete structure on which the butyl rubber film is formed, and fixing from the reinforcing member And screwing a bolt into the female screw hole of the connecting plate to compress the butyl rubber film and connecting the reinforcing member and the connecting plate.

  In addition, the concrete structure seismic strengthening method of the present invention is characterized in that the shape and thickness of the connecting plate are formed so as to be flush with the surface of the concrete structure.

  Further, the seismic reinforcement structure for a concrete structure according to the present invention includes a connection plate in which female screw holes fixed to a plurality of recesses formed within the depth of the cover concrete are formed on the surface of the concrete structure, and the concrete structure. A reinforcing member having a fixed bolt insertion hole formed at a position corresponding to the female screw hole formed in the connection plate, and a fixing bolt insertion hole formed in the reinforcing member. The fixing bolt is inserted and screwed into the female screw hole of the connection plate, and a solidifying material filled in the gap between the concrete structure and the reinforcing member and solidified.

  The concrete structure seismic reinforcement structure according to the present invention includes a connection plate in which a plurality of female screw holes fixed to a plurality of recesses formed in the range of the depth of the cover concrete are formed on the surface of the concrete structure, A butyl rubber film formed on the surface of the concrete structure, a reinforcing member disposed around the concrete structure on which the butyl rubber film is formed, and the butyl rubber film inserted through a fixing bolt insertion hole formed in the reinforcing member. And a fixing bolt that is screwed into the female screw hole of the connecting plate while being compressed.

  A step of suspending the surface of the concrete structure at a depth in the cover concrete to form a plurality of recesses; a step of fixing a connecting plate having a female screw hole with a thickness of the dents to the plurality of recesses; and the concrete. Arranging a reinforcing member at a predetermined interval around the structure, screwing a fixing screw from the reinforcing member into a female screw hole of the connecting plate, and connecting the reinforcing member and the connecting plate; and the concrete structure And filling the space between the reinforcing member and the reinforcing member, solidifying the solidifying material, and integrating the reinforcing member and the concrete structure, thereby reducing the lifting work without damaging the internal rebar. The reinforcing member and the concrete structure are mechanically connected by the connecting plate and the fixing bolt, and further solidified by solidifying the solidifying material. It becomes possible. Furthermore, the replacement work of the reinforcing member can be easily performed.

  By arranging an interval holding member in which a hole for inserting a fixing bolt is formed between the connecting plate and the reinforcing member, it is possible to keep a constant gap between the reinforcing member and the concrete structure.

  Suspending the surface of the concrete structure at a depth in the cover concrete, forming a plurality of recesses, fixing a connecting plate having the same thickness as the suspension depth and forming a female screw hole in the plurality of recesses, and concrete A step of forming a butyl rubber film on the surface of the structure, a step of arranging a reinforcing material around the concrete structure on which the butyl rubber film is formed, and screwing a fixing bolt from the reinforcing member into the female screw hole of the connecting plate. The step of connecting the reinforcing member and the connecting plate while compressing the butyl rubber film can reduce the lifting work without damaging the internal rebar, and the reinforcing member and the concrete structure can attach the butyl rubber film. It is possible to connect mechanically and firmly by screwing the connecting plate and the fixing bolt while compressing. In addition, the reinforcing member can be disposed in close contact despite the presence of unevenness on the surface of the concrete structure.

  By setting the surface shape and thickness of the connection plate so as to be flush with the surface of the concrete structure, the screwing length by the fixing bolt between the reinforcing member and the connection plate can be made constant.

  A connecting plate having a plurality of female screw holes fixed to a plurality of recesses formed within the depth of the cover concrete on the surface of the concrete structure, and a fixed interval around the concrete structure. A reinforcing member in which a fixing bolt insertion hole is formed at a position corresponding to the female screw hole formed in the connecting plate, and a fixing bolt inserting hole formed in the reinforcing member and inserted into the female screw hole of the connecting plate. And a solidifying agent that fills and solidifies the gap between the concrete structure and the reinforcing member, thereby mechanically connecting the reinforcing member and the concrete structure with the connecting plate and the fixing bolt. Further, the solidification of the solidifying material can be firmly integrated. Furthermore, the replacement work of the reinforcing member can be easily performed.

  A connection plate formed with a plurality of female screw holes fixed to a plurality of recesses formed within the depth of the cover concrete on the surface of the concrete structure, and a butyl rubber film formed on the surface of the concrete structure; A reinforcing member disposed around a concrete structure on which a butyl rubber film is formed, and a fixing bolt insertion hole formed in the reinforcing member, and is inserted into a female screw hole of the connecting plate while compressing the butyl rubber film. It is possible to firmly connect the reinforcing member and the concrete structure by the connecting plate and the fixing bolt. In addition, the reinforcing member can be disposed in close contact despite the presence of unevenness on the surface of the concrete structure. Furthermore, the replacement work of the reinforcing member can be easily performed.

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  Embodiments of the present invention will be described with reference to the drawings. Fig.1 (a) (b) shows embodiment which carries out earthquake-proof reinforcement with respect to the reinforced concrete columnar body of a cross section rectangle.

  A reinforced concrete cross-section rectangular columnar body 1 of a structure such as a building column or a bridge pier has a main reinforcing bar 2 and a secondary reinforcing bar 3 arranged therein. In the reinforced concrete structure, the cover concrete portion outside the internal rebar deteriorates due to aging.

  In the first step for the seismic reinforcement of the rectangular columnar body 1 having the deteriorated surface, the concrete having the deteriorated surface is suspended in the range of the cover concrete 1a to form a recess for fixing the connecting plate 4. The depth of the recess is the same as the thickness of the connecting plate 4.

  A 2nd process fixes the connection plate 4 to a recessed part. As the fixing means, fixing by an adhesive or mechanical fixing means such as a fixing pin is used. A female screw hole is formed in the connecting plate 4. A plurality of female screw holes may be formed. The connecting plate 4 is formed of a material having a large strength such as steel or reinforced resin. The surface shape of the connection plate 4 is flat and the thickness is the same as the depth of the recess so that the surface of the connection plate 4 fixed to the recess of the rectangular columnar body 1 is flush with the surface of the rectangular columnar body 1. Form. When an adhesive is used as the fixing means, it is desirable that the back surface of the connecting plate 4 be a surface to improve the adhesive strength of the adhesive.

  A 3rd process arrange | positions the reinforcement member 5 in the outer periphery of the cross-sectional rectangular columnar body 1 with which the connection plate 4 was fixed to the recessed part. The reinforcing member 5 of this embodiment is configured by connecting a pair of U-shaped members 5a and 5a so as to face each other and further connecting a plurality of members in the vertical direction. The U-shaped member 5a is formed of a material having a large strength such as steel or reinforced resin. A fixing bolt insertion hole is formed in the U-shaped member 5 a in a position corresponding to the female screw hole formed in the connecting plate 4.

  In the fourth step, the reinforcing member 5 disposed on the outer periphery of the rectangular columnar body 1 and the connecting plate 4 are fixed via the fixing bolt 6. By disposing the interval holding member 7 in which the fixing bolt insertion hole is formed between the connecting plate 4 and the reinforcing member 5, the interval between the reinforcing member 5 and the connecting plate 4 can be kept constant. The front and back surfaces of the spacing member 7 have a planar shape that makes surface contact with the reinforcing member 5 and the connecting plate 4. Since the thickness of the connecting plate 4 is within the range of the cover concrete, when the screwing length cannot be secured sufficiently, the fixing bolt 6 is increased by increasing the outer diameter of the fixing bolt 6 and the inner diameter of the female screw hole formed in the connecting plate 4. 6 and the connecting plate 4 are preferably secured.

  In the fifth step, the gap between the reinforcing member 5 fixed to the connection plate 4 and the rectangular columnar body 1 is filled with a solidifying material such as high-strength concrete mortar and solidified. The reinforcing member 5 and the rectangular columnar body 1 are firmly integrated by solidifying the solidifying material.

  According to the concrete structure seismic reinforcement method of this embodiment, the suspending work can be reduced without damaging the internal reinforcing bars, and the reinforcing member 5 and the rectangular columnar body 1 are connected by the connecting plate 4 and the fixing bolt 6. It is possible to mechanically connect and further solidify by solidifying the solidified material.

  2 (a) and 2 (b) show an embodiment in which earthquake-proof reinforcement is performed on a circular columnar body 8 made of reinforced concrete.

  In a circular columnar body 8 of a reinforced concrete structure such as a building column or a bridge pier, a main reinforcing bar 9 and a secondary reinforcing bar 10 are arranged inside. In the reinforced concrete structure, the cover concrete portion outside the internal rebar deteriorates due to aging.

In the first step for seismic reinforcement of the circular columnar body 8 whose surface is deteriorated, the concrete whose surface is deteriorated is suspended within the range of the cover concrete 8a, and a recess for fixing the connecting plate 11 is formed. The depth of the recess is the same as the thickness of the connecting plate 11.
A 2nd process fixes the connection plate 11 to a recessed part. As the fixing means, fixing by an adhesive or mechanical fixing means such as a fixing pin is used. A female screw hole is formed in the connecting plate 11. A plurality of female screw holes may be formed. The connection plate 11 is formed of a material having high strength such as steel or reinforced resin. The front and back surfaces of the connecting plate 11 are arcuate surfaces and the thickness is the depth of the recess so that the surface of the connecting plate 11 fixed to the recess of the circular columnar body 8 and the surface of the circular columnar body 8 are flush with each other. Form the same. In the case of fixing with an adhesive, it is desirable that the back surface of the connecting plate 11 be a surface to improve the adhesive strength with the adhesive.

  A 3rd process arrange | positions the formwork and reinforcement part 12 in the outer periphery of the cross-section circular columnar body 8 by which the connection plate 11 was fixed to the recessed part. The reinforcing member 12 of this embodiment is configured by connecting a pair of semicircular members 12a and 12a so as to face each other and further connecting a plurality of members in the vertical direction. The cross-sectional semicircular member 12a is formed of a material having high strength such as steel or reinforced resin. A fixing bolt insertion hole is formed at a position corresponding to the female screw hole formed in the connecting plate 4 in the semicircular member 12a.

  In the fourth step, the reinforcing member 12 disposed on the outer periphery of the circular columnar body 8 and the connecting plate 11 are fixed via the fixing bolts 13. By disposing the interval holding member 14 in which the fixing bolt insertion hole is formed between the connecting plate 11 and the reinforcing member 5, the interval between the reinforcing member 12 and the connecting plate 11 can be held constant. The front and back surfaces of the spacing member 14 have an arc shape that is in surface contact with the mold / holding portion 5 and the connecting plate 4. Since the thickness of the connecting plate 11 is within the range of the cover concrete, when the screwing length cannot be sufficiently secured, the fixing bolt 6 is increased by increasing the outer diameter of the fixing bolt 13 and the inner diameter of the female screw hole formed in the connecting plate 11. It is preferable to ensure that the connection plate 4 is fixed.

  In the fifth step, the gap between the reinforcing member 12 fixed to the connecting plate 11 and the circular columnar body 8 is filled with a solidifying material such as high-strength concrete mortar and solidified. The reinforcing member 12 and the rectangular columnar body 8 are firmly integrated by solidifying the solidifying material.

  According to the concrete structure seismic reinforcement method of this embodiment, the suspending operation can be reduced without damaging the internal rebar, and the reinforcing member 12 and the circular columnar body 8 are connected by the connecting plate 11 and the fixing bolt 13. It is possible to mechanically connect and further solidify by solidifying the solidified material.

  FIG. 3 shows an embodiment in which seismic reinforcement is applied to the concrete main girder 15 made of reinforced concrete.

  A concrete main girder 15 made of reinforced concrete of a bridge has a main reinforcement 16 and a secondary reinforcement 17 arranged inside. In the reinforced concrete structure, the cover concrete portion outside the internal rebar deteriorates due to aging.

  In the first step for the seismic reinforcement of the concrete main girder 15 whose surface is deteriorated, the concrete whose surface is deteriorated is suspended in the range of the cover concrete 15a, and a recess for fixing the connecting plate 18 is formed. The depth of the recess is the same as the thickness of the connecting plate 18.

  Hereinafter, as in the embodiment shown in FIGS. 1 and 2, the step of fixing the connecting plate 18 to the recess, the step of arranging the reinforcing member 19 around the concrete main beam 15, and the interval between the reinforcing member 19 and the connecting plate 18. The step of fixing with the fixing bolt 20 through the holding member 21, filling the space between the reinforcing member 19 and the concrete main girder 15 with a solidifying material, solidifying the solidifying material, and fixing the concrete main girder 15 and the reinforcing member 19 together. To do.

  Since the operation and effect are the same as those of the embodiment shown in FIGS.

  FIG. 4 shows an embodiment in which the U-shaped side groove 22 made of reinforced concrete is seismically reinforced.

  The U-shaped side groove 22 made of reinforced concrete has a main bar 23 and a secondary bar 24 arranged therein. In the reinforced concrete structure, the cover concrete portion outside the internal rebar deteriorates due to aging.

  In the first step for seismic reinforcement of the U-shaped side groove 22 whose surface has deteriorated, the concrete whose surface has deteriorated is suspended within the range of the covering concrete 22a, and a recess for fixing the connecting plate 25 is formed. The depth of the recess is the same as the thickness of the connecting plate 25.

  Hereinafter, similarly to the embodiment shown in FIGS. 1 and 2, the step of fixing the connecting plate 25 to the recess, the step of arranging the reinforcing member 26 along the inner wall of the U-shaped side groove 22, the reinforcing member 26 and the connecting plate 25. Is fixed by fixing bolts 27 via a spacing member 28, the space between the U-shaped side groove 22 and the reinforcing member 26 is filled with a solidifying material, the solidified material is solidified, and the U-shaped side groove 22 and the reinforcing member 26 are integrated. Secure to.

  Since the operation and effect are the same as those of the embodiment shown in FIGS. 1, 2, and 3, description thereof will be omitted.

  5 (a) and 5 (b) show another embodiment in which seismic reinforcement is applied to a reinforced concrete columnar body having a rectangular cross section.

  A reinforced concrete cross-section rectangular columnar body 1 of a structure such as a building column or a bridge pier has a main reinforcing bar 2 and a secondary reinforcing bar 3 arranged therein. In the reinforced concrete structure, the cover concrete portion outside the internal rebar deteriorates due to aging.

  In the first step for the seismic reinforcement of the rectangular columnar body 1 having the deteriorated surface, the concrete having the deteriorated surface is suspended in the range of the cover concrete 1a to form a recess for fixing the connecting plate 4. The depth of the recess is the same as the thickness of the connecting plate 4.

  A 2nd process fixes the connection plate 4 to a recessed part. As the fixing means, fixing by an adhesive or mechanical fixing means such as a fixing pin is used. A female screw hole is formed in the connecting plate 4. A plurality of female screw holes may be formed. The connecting plate 4 is formed of a material having a large strength such as steel or reinforced resin. The surface shape of the connection plate 4 is flat and the thickness is the same as the depth of the recess so that the surface of the connection plate 4 fixed to the recess of the rectangular columnar body 1 is flush with the surface of the rectangular columnar body 1. Form. When an adhesive is used as the fixing means, it is desirable that the back surface of the connecting plate 4 be a surface to improve the adhesive strength of the adhesive.

  In the third step, a butyl rubber film 30 is formed on the surface of the rectangular columnar body 1 having the connection plate 4 fixed thereto. The butyl rubber film 30 is formed by means such as coating. The thickness of the butyl rubber film 30 is such that unevenness on the surface of the rectangular columnar body 1 is eliminated.

  In the fourth step, the reinforcing member 5 is disposed on the outer periphery of the rectangular columnar body 1 having the butyl rubber film 30 formed thereon. The reinforcing member 5 of this embodiment is configured by connecting a pair of U-shaped members 5a and 5a so as to face each other and further connecting a plurality of members in the vertical direction. The U-shaped member 5a is formed of a material having a large strength such as steel or reinforced resin. A fixing bolt insertion hole is formed in the U-shaped member 5 a in a position corresponding to the female screw hole formed in the connecting plate 4.

  In the fifth step, the reinforcing member 5 arranged on the outer periphery of the rectangular columnar body 1 and the connecting plate 4 are fixed via the fixing bolt 6 while compressing the butyl rubber film 30. Since the butyl rubber film 30 is compressed and fixed by the fixing bolt 6, the reinforcing member 5 can be tightly fixed to the rectangular columnar body 1 in spite of the presence of unevenness on the surface of the rectangular columnar body 1.

  According to the seismic reinforcement method for concrete structures of this embodiment, the suspending operation can be reduced without damaging the internal reinforcing bars, and the reinforcing member 5 and the rectangular columnar body 1 are brought into close contact with each other and fixed to the connecting plate 4. It can be fixed by the bolt 6.

  6 (a) and 6 (b) show an embodiment in which seismic reinforcement is applied to a circular columnar body 8 made of reinforced concrete.

  In a circular columnar body 8 of a reinforced concrete structure such as a building column or a bridge pier, a main reinforcing bar 9 and a secondary reinforcing bar 10 are arranged inside. In the reinforced concrete structure, the cover concrete portion outside the internal rebar deteriorates due to aging.

In the first step for seismic reinforcement of the circular columnar body 8 whose surface is deteriorated, the concrete whose surface is deteriorated is suspended within the range of the cover concrete 8a, and a recess for fixing the connecting plate 11 is formed. The depth of the recess is the same as the thickness of the connecting plate 11.
A 2nd process fixes the connection plate 11 to a recessed part. As the fixing means, fixing by an adhesive or mechanical fixing means such as a fixing pin is used. A female screw hole is formed in the connecting plate 11. A plurality of female screw holes may be formed. The connection plate 11 is formed of a material having high strength such as steel or reinforced resin. The front and back surfaces of the connecting plate 11 are arcuate surfaces and the thickness is the depth of the recess so that the surface of the connecting plate 11 fixed to the recess of the circular columnar body 8 and the surface of the circular columnar body 8 are flush with each other. Form the same. In the case of fixing with an adhesive, it is desirable that the back surface of the connecting plate 11 be a surface to improve the adhesive strength with the adhesive.

  In the third step, the butyl rubber film 30 is formed on the surface of the circular columnar body 8 with the connecting plate 11 fixed thereto. The butyl rubber film 30 is formed by means such as coating. The thickness of the butyl rubber film 30 is set such that unevenness on the surface of the circular columnar body 8 is eliminated.

  In the fourth step, the reinforcing member 12 is disposed on the outer periphery of the circular columnar body 8 with the butyl rubber film 30 formed thereon. The reinforcing member 12 of this embodiment is configured by connecting a pair of semicircular members 12a and 12a so as to face each other and further connecting a plurality of members in the vertical direction. The cross-sectional semicircular member 12a is formed of a material having high strength such as steel or reinforced resin. A fixing bolt insertion hole is formed at a position corresponding to the female screw hole formed in the connecting plate 4 in the semicircular member 12a.

  In the fifth step, the reinforcing member 12 arranged on the outer periphery of the circular columnar body 8 and the connecting plate 11 are fixed via the fixing bolt 13 while compressing the butyl rubber film 30. Since the butyl rubber film 30 is compressed and fixed by the fixing bolt 13, the reinforcing member 12 can be tightly fixed to the cross-sectional circular columnar body 8 regardless of the presence of unevenness on the surface of the circular columnar body 8.

  According to the seismic reinforcement method for concrete structure of this embodiment, the suspending operation can be reduced without damaging the internal reinforcing bars, and the reinforcing member 12 and the circular columnar body 8 in cross section are brought into close contact and fixed to the connecting plate 11. The bolt 6 can be fixed by screwing.

  FIG. 7 shows an embodiment in which seismic reinforcement is applied to a concrete main girder 15 made of reinforced concrete.

  A concrete main girder 15 made of reinforced concrete of a bridge has a main reinforcement 16 and a secondary reinforcement 17 arranged inside. In the reinforced concrete structure, the cover concrete portion outside the internal rebar deteriorates due to aging.

  In the first step for the seismic reinforcement of the concrete main girder 15 whose surface is deteriorated, the concrete whose surface is deteriorated is suspended in the range of the cover concrete 15a, and a recess for fixing the connecting plate 18 is formed. The depth of the recess is the same as the thickness of the connecting plate 18.

  Hereinafter, similarly to the embodiment shown in FIGS. 5 and 6, the step of fixing the connecting plate 18 to the recess, the step of forming the butyl rubber film 30 on the surface of the concrete main girder 15, and the reinforcing members 19 around the concrete main girder 15. The reinforcing member 19 and the connecting plate 18 are fixed via the fixing bolt 13 while compressing the butyl rubber film 30. A fixing process is provided by the fixing bolt 13 while compressing the butyl rubber film 30.

  Since the operation and effect are the same as those of the embodiment shown in FIGS.

  FIG. 8 shows an embodiment in which the U-shaped side groove 22 made of reinforced concrete is seismically reinforced.

  The U-shaped side groove 22 made of reinforced concrete has a main bar 23 and a secondary bar 24 arranged therein. In the reinforced concrete structure, the cover concrete portion outside the internal rebar deteriorates due to aging.

  In the first step for seismic reinforcement of the U-shaped side groove 22 whose surface has deteriorated, the concrete whose surface has deteriorated is suspended within the range of the covering concrete 22a, and a recess for fixing the connecting plate 25 is formed. The depth of the recess is the same as the thickness of the connecting plate 25.

  Hereinafter, similarly to the embodiment shown in FIGS. 5, 6, and 7, the step of fixing the connecting plate 25 to the recess, the step of forming the butyl rubber film 30 on the surface of the U-shaped side groove 22, A step of arranging the reinforcing member 26 and a fixing step of fixing the reinforcing member 26 and the connecting plate 25 via the fixing bolt 27 while compressing the butyl rubber film 30 are provided.

  Since the operation and effect are the same as those of the embodiment shown in FIGS. 5, 6, and 7, description thereof will be omitted.

  The concrete structure seismic reinforcement method of the present invention can also be applied to concrete walls, concrete beams, concrete floors and the like.

  As described above, according to the concrete structure seismic reinforcement method and the concrete structure seismic reinforcement structure of the present invention, the suspending work can be reduced without damaging the internal rebar, and the reinforcing member and the concrete structure can be reduced. It is possible to mechanically connect with the connecting plate and the fixing bolt, and further to firmly integrate by solidifying the solidified material. In addition, the reinforcing member and the concrete structure can be tightly fixed regardless of the presence of unevenness on the surface of the concrete structure. Furthermore, the replacement work of the reinforcing member can be easily performed.

  1: rectangular cross section in cross section, 1a: cover concrete, 2: main reinforcement, 3: secondary reinforcement, 4: connection plate, 5: formwork / reinforcement part, 5a: U-shaped cross section, 6: fixing bolt, 7: spacing Member, 8: Circular columnar section, 8a: Cover concrete, 9: Main reinforcement, 10: Secondary reinforcement, 11: Connecting plate, 12: Formwork and reinforcement, 12a: Semicircular section member, 13: Fixing bolt, 14: Spacing member, 15: Main concrete girder, 15a: Cover concrete, 16: Main bar, 17: Secondary bar, 18: Connecting plate, 19: Reinforcing member, 20: Fixing bolt, 21: Spacing member, 22: U-shaped side groove 22a: Cover concrete, 23: Main reinforcement, 24: Secondary reinforcement, 25: Connection plate, 26: Reinforcing member, 27: Fixing bolt, 28: Spacing member, 30: Butyl rubber film

Claims (6)

Suspending the surface of the concrete structure at the depth in the cover concrete to form a plurality of recesses;
Fixing the connection plate having the same thickness as the suspended depth and forming a female screw hole in the plurality of recesses;
Arranging reinforcing members at regular intervals around the concrete structure;
Screwing a fixing bolt from the reinforcing member into the female screw hole of the connecting plate, and connecting the reinforcing member and the connecting plate;
Filling the space between the concrete structure and the reinforcing member with a solidifying material, solidifying the solidifying material, and integrating the reinforcing member and the concrete structure;
A seismic reinforcement method for concrete structures characterized by comprising:   The concrete structure seismic reinforcement method according to claim 1, wherein a spacing member having a hole through which a fixing bolt is inserted is disposed between the connection plate and the reinforcing member. Suspending the surface of the concrete structure at the depth in the cover concrete to form a plurality of recesses;
Fixing the connection plate having the same thickness as the suspended depth and forming a female screw hole in the plurality of recesses;
Forming a butyl rubber film on the surface of the concrete structure;
Arranging a reinforcing material around the concrete structure on which the butyl rubber film is formed;
Connecting the reinforcing member and the connecting plate while screwing a fixing bolt from the reinforcing member into the female screw hole of the connecting plate and compressing the butyl rubber film;
A seismic reinforcement method for concrete structures characterized by comprising:   The concrete structure seismic reinforcement method according to any one of claims 1 to 3, wherein a shape and thickness of the connection plate are formed so as to be flush with a surface of the concrete structure.   A connection plate formed with female screw holes fixed to a plurality of recesses formed within the depth of the cover concrete on the surface of the concrete structure, and arranged around the concrete structure at regular intervals, A reinforcing member in which a fixing bolt insertion hole is formed at a position corresponding to the female screw hole formed in the connecting plate, and a fixing bolt inserting hole formed in the reinforcing member, and the screw is inserted into the female screw hole of the connecting plate. A concrete structure seismic reinforcement structure comprising: a fixing bolt; and a solidifying material that fills and solidifies a gap between the concrete structure and the reinforcing member.   A connecting plate having female screw holes fixed to a plurality of recesses formed within the depth of the cover concrete on the surface of the concrete structure, a butyl rubber film formed on the surface of the concrete structure, and a butyl rubber film A reinforcing member disposed around the concrete structure formed with the fixing member, and a fixing member inserted through a fixing bolt insertion hole formed in the reinforcing member and screwed into the female screw hole of the connecting plate while compressing the butyl rubber film. A concrete seismic reinforcement structure characterized by comprising bolts.

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