JP2009235686A - Seismic strengthening structure of concrete structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seismic strengthening structure of a concrete structure, which can reduce the amount of infilled mortar and suppress the generation of noises and vibrations and the production of dust during construction. <P>SOLUTION: A shank 20a of a first bolt 20 is inserted into an insertion hole 18 formed in the inner peripheral surface 13a of the opening 13 of the concrete structure 10; a head 20b thereof is protruded into a gap S between the inner peripheral surface 13a and a steel frame 15 and fixed with an adhesive; and a plurality of cotters 23 are protruded into the gap S and fixed to an outer peripheral surface of the steel frame 15 by welding. Thus, since the size of the gap S between the inner peripheral surface 13a of the opening 13 and the steel frame 15 can become smaller than before, costs can be curbed by reducing the amount of the infilled expensive shrinkage compensating mortar. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a seismic reinforcement structure for a concrete structure.

As an earthquake-proof reinforcement method for existing buildings, those described in Patent Document 1 and FIGS. 14 to 16 are known.
This technique performs seismic reinforcement of an existing concrete structure such as a building, and a reinforcing frame 3 composed of a steel frame 1 and a steel brace 2 is installed in an opening 6 surrounded by columns 4 and beams 5. It is a construction method.
First, after removing the finishing mortar of the opening 6 surrounded by the pillars 4 and the beams 5 and roughening the concrete surface, the post-construction anchors 7 are installed at appropriate intervals on the inner peripheral surface of the opening 6. The studs 8 are installed on the steel frame 1 of the reinforcing frame 3 at appropriate intervals by welding.
Next, the reinforcing frame 3 is installed in the opening 6 so that the stud 8 is positioned between the post-installed anchors 7 and 7, and the gap S between the inner peripheral surface of the opening 6 and the steel frame 1 is set. The spiral muscle 9 is arranged in
Next, the opening 6, that is, the existing building, and the reinforcing frame 3 are integrated by filling the gap S with the non-shrink mortar M.
JP 2008-14065 A

However, in the above-described conventional technology, the length of the post-construction anchor projecting from the inner peripheral surface of the opening of the concrete structure and the length of the stud projecting from the steel frame of the reinforcing frame are long. The gap between the surface and the steel frame is increased, and therefore, the amount of expensive non-shrinkable mortar filled becomes enormous and costs increase.
Also, when removing the finishing mortar from the opening to roughen the concrete surface, or drilling a hole for post-installation anchor insertion on the inner peripheral surface of the opening, noise, vibration, dust, etc. are severe. The building is almost unusable during construction.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a seismic reinforcement structure for a concrete structure that can reduce the amount of mortar filling and suppress noise, vibration, and dust during construction. Yes.

In order to solve the above-mentioned problem, the invention according to claim 1 is a seismic reinforcement structure for a concrete structure,
A reinforcing frame having a steel frame and braces provided in the steel frame in an opening surrounded by columns and beams of the concrete structure has a predetermined gap between the opening and the inner peripheral surface of the opening. Arranged with
A plurality of insertion holes are formed in the inner peripheral surface of the opening by cutting at predetermined intervals along the circumferential direction of the opening,
In the insertion hole, the first bolt inserts the shaft portion and the head protrudes from the inner peripheral surface into the gap and is fixed by an adhesive,
On the outer peripheral surface of the steel frame, a plurality of cotters are arranged at predetermined intervals along the circumferential direction of the steel frame and protruded into the gap and fixed by welding,
The heads of the first bolts and the cotters are alternately arranged along the circumferential direction of the opening,
The gap is filled with mortar.

The invention according to claim 2 is a seismic reinforcement structure for a concrete structure,
A reinforcing frame having a steel frame and braces provided in the steel frame in an opening surrounded by columns and beams of the concrete structure has a predetermined gap between the opening and the inner peripheral surface of the opening. Arranged with
A plurality of insertion holes are formed in the inner peripheral surface of the opening by cutting at predetermined intervals along the circumferential direction of the opening,
In the insertion hole, the first bolt inserts the shaft portion and the head protrudes from the inner peripheral surface into the gap and is fixed by an adhesive,
In the steel frame, a plurality of second bolts are arranged at predetermined intervals along the circumferential direction of the steel frame,
The second bolt is fixed to the flange by inserting a shaft portion of the second bolt into the flange of the steel frame and tightening a nut screwed into the shaft portion.
The head of the second bolt or the nut protrudes from the flange into the gap;
The heads of the first bolts and the heads of the second bolts or the nuts are alternately arranged along the circumferential direction of the opening,
The gap is filled with mortar.

The invention according to claim 3 is the seismic reinforcement structure for a concrete structure according to claim 1 or 2,
The insertion hole is formed by drilling the inner peripheral surface of the opening with a core drill.

  The invention according to claim 4 is characterized in that in the seismic reinforcement structure for a concrete structure according to any one of claims 1 to 3, a reinforcing bar is disposed in the gap.

Here, as the reinforcing bar, in the case of the invention according to claim 1, a ring-shaped reinforcing bar may be arranged so as to surround the heads of the adjacent cotters and the first bolt located between them, Linear rebars are arranged in parallel across the heads of the cotter and the first bolt, and the U-shaped rebars are connected to the ends of the linear rebars so that the ends of the linear rebars are connected to each other. It may be arranged on top of each other.
Moreover, in the case of invention of Claim 2, you may arrange | position a ring-shaped reinforcing bar so that the head or nut of an adjacent 2nd bolt, and the head of the 1st bolt located between these may be enclosed. Then, linear rebars are arranged in parallel across the heads or nuts of the adjacent second bolts and the heads of the first bolts located between them, and the ends of these linear rebars are arranged between them. A U-shaped reinforcing bar may be placed on the end of the linear reinforcing bar so as to be connected.

According to the first aspect of the present invention, the first bolt inserts the shaft portion into the insertion hole formed in the inner peripheral surface of the opening, and the head protrudes from the inner peripheral surface into the gap. Since the plurality of cotters are fixed to the outer peripheral surface of the steel frame by welding while protruding into the gap, the head of the first bolt protrudes from the inner peripheral surface of the opening. The length can be shortened compared to the protruding length of the conventional post-installed anchor, and the protruding length of the cotter from the outer peripheral surface of the steel frame can be shortened compared to the protruding length of the conventional stud.
Therefore, since the gap between the inner peripheral surface of the opening and the steel frame can be made smaller than before, the filling amount of expensive non-shrink mortar can be reduced and the cost can be suppressed.

  The first bolt head and the cotter are alternately arranged along the circumferential direction of the opening, and the gap is filled with mortar. Since the shearing force is transmitted one-on-one with the support pressure of the cotter, the shearing force can be reliably transmitted even if there is a finished mortar of the opening. Therefore, it is possible to prevent noise, vibration, dust and the like resulting from the removal of the conventional finishing mortar.

According to the second aspect of the present invention, the first bolt inserts the shaft portion into the insertion hole formed in the inner peripheral surface of the opening, and the head protrudes from the inner peripheral surface into the gap. It is fixed by an adhesive, and the second bolt is fixed to the flange by inserting a shaft portion of the second bolt into the flange and tightening a nut screwed into the shaft portion to the flange of the steel frame, Since the head of the second bolt or the nut protrudes from the flange into the gap, the protrusion length of the head of the first bolt from the inner peripheral surface of the opening is the protrusion length of the conventional post-installed anchor. The projecting length of the head of the second bolt or the nut from the flange of the steel frame can be shortened compared to the projecting length of the conventional stud.
Therefore, since the gap between the inner peripheral surface of the opening and the steel frame can be made smaller than before, the filling amount of expensive non-shrink mortar can be reduced and the cost can be suppressed.

  Further, the heads of the first bolts and the heads or nuts of the second bolts are alternately arranged along the circumferential direction of the opening, and the gap is filled with mortar. Since the shear force is transmitted in a one-to-one relationship with the support pressure of the head of the first bolt and the head of the second bolt, the shear force can be reliably transmitted even if there is a finishing mortar for the opening. Therefore, it is possible to prevent noise, vibration, dust and the like caused by removing the conventional finishing mortar.

  According to invention of Claim 3, since the said insertion hole is formed by drilling the internal peripheral surface of the said opening part with a core drill, it is for the post-installation anchor insertion in the internal peripheral surface of the conventional opening part. Noise, vibration, dust and the like can be suppressed as compared with the case of drilling a hole.

  According to invention of Claim 4, since the reinforcing bar is arrange | positioned in the said clearance gap, splitting reinforcement of the mortar with which the clearance gap was filled with this reinforcing bar, or the support pressure of the head of a 1st volt | bolt and a cotter, The supporting pressure between the head of the first bolt and the head of the second bolt can be increased, so that the shearing force can be reliably transmitted.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
1-4 is a figure which shows 1st Embodiment of the earthquake-proof reinforcement structure of the concrete structure based on this invention.
As shown in these drawings, the opening 13 surrounded by the pillar 11 and the beam 12 of the concrete structure 10 has a predetermined gap S between the reinforcing frame 14 and the inner peripheral surface 13 a of the opening 13. It is arranged with.

  The reinforcing frame 14 includes a steel frame 15 and braces 16 and 17 provided in the steel frame 15. The steel frame 15 is formed by assembling H-shaped steel into a rectangular frame shape, and its flange 15 a is arranged in the opening 13 in parallel with the inner peripheral surface 13 a of the opening 13. A predetermined gap S is provided between the flange 15a and the inner peripheral surface 13a.

A plurality of insertion holes 18 are formed at predetermined intervals along the circumferential direction of the opening 13 in the inner peripheral surface 13 a of the opening 13. These insertion holes 18 are formed by drilling the inner peripheral surface 13a with a small-diameter core drill.
Here, the core drill is provided with a cylindrical core body and a drilling blade provided at the lower edge of the core body, so that noise, vibration, dust, etc. are generated in drilling as compared with a normal drill. There are few things. Further, since the core drill has a small diameter, the insertion hole 18 can be drilled by an anhydrous method.
A first bolt 20 is inserted into the insertion hole 18 and the shaft portion 20a is inserted therein, and the head portion 20b protrudes from the inner peripheral surface 13a into the gap S and is fixed by an adhesive 22. The depth of the insertion hole 18 is deeper than the length of the shaft portion 20 a of the first bolt 20, and the inner diameter of the insertion hole 18 is slightly larger than the diameter of the shaft portion 20 a of the first bolt 20. The first bolt 20 is fixed to the insertion hole 18 by the adhesive 22 being interposed between the inner wall surface of the insertion hole 18 and the shaft portion 20 a of the first bolt 20.
The amount of protrusion of the first bolt 20 from the inner peripheral surface 13a of the head 20b is slightly smaller than half the width of the gap S. A washer 21 is interposed between the head 20b and the inner peripheral surface 13a.

A plurality of cotters 23 are arranged at predetermined intervals along the circumferential direction of the steel frame 15 on the outer peripheral surface of the steel frame 15, that is, the surface of the flange 15 a, and protruded into the gap S and fixed by welding. Yes. The cotter 23 is a rectangular block made of steel, and is fixed to the surface of the flange 15a by whole circumference fillet welding.
The amount of protrusion of the cotter 23 from the surface of the flange 15a is slightly smaller than half the width of the gap S.
Thus, the amount of protrusion of the cotter 23 from the surface of the flange 15a is slightly smaller than half the width of the gap S, and the amount of protrusion of the first bolt 20 from the inner peripheral surface 13a of the head 20b is the gap S. Since it is slightly smaller than half of the width, there is a predetermined gap in the width direction of the gap S between the cotter 23 and the head 20b.
The amount of protrusion of the cotter 23 from the surface of the flange 15a is made larger than half the width of the gap S, and the amount of protrusion of the first bolt 20 from the inner peripheral surface 13a of the head 20b is made half of the width of the gap S. You may enlarge it.

The heads 20 b and the cotters 23 of the plurality of first bolts 20 are alternately arranged in the circumferential direction of the opening 13.
In the gap S, the adjacent cotters 23, 23 and the head portion 20b of the first bolt located between them are surrounded by a reinforcing bar as seen from a plane parallel to the inner peripheral surface 13a of the opening 13. 25 is arranged. Further, the reinforcing bars 25 are arranged in the gap between the head 20 b of the first bolt 20 and the cotter 23.
The reinforcing bars 25 are formed in a rectangular ring shape, and at the sides of the cotter 23, the ends of the adjacent reinforcing bars 25, 25 overlap in the width direction of the gap S (the vertical direction in FIG. 2). That is, a plurality of reinforcing bars 25 are arranged along the circumferential direction of the opening 13, and end portions thereof overlap each other.
The amount of protrusion of the cotter 23 from the surface of the flange 15a is made larger than half the width of the gap S, and the amount of protrusion of the first bolt 20 from the inner peripheral surface 13a of the head 20b is made half of the width of the gap S. When it is enlarged, the rebar 25 surrounds the adjacent cotters 23 and 23 and the head portion 20b of the first bolt located between them as seen from a plane parallel to the inner peripheral surface 13a of the opening 13. At the same time, the head 20b of the first bolt 20 and the cotter 23 are arranged in the gap S so as to overlap each other.

The gap S is filled with non-shrink mortar 26. As a result, the opening 13, that is, the existing concrete structure 10 and the reinforcing frame 14 are integrated.
When the non-shrink mortar 26 is filled, a weir plate (not shown) is arranged between both sides of the gap S, that is, between both edges of the flange 15a of the steel frame 15 and the inner peripheral surface 13a of the opening 13. After closing both sides of S, the gap S is filled with the non-shrink mortar 26, and after this has hardened, the weir plate may be removed.

Next, the construction method of the seismic reinforcement structure of a concrete structure is demonstrated.
First, a plurality of insertion holes 18 are formed at predetermined intervals along the circumferential direction of the opening 13 on the inner peripheral surface 13 a of the opening 13 surrounded by the pillar 11 and the beam 12. In this case, the insertion hole 18 is formed by drilling the inner peripheral surface 13a with a small diameter core drill.
Next, after filling each insertion hole 18 with an adhesive, a washer 21 is extrapolated to the shaft portion 20 a of the first bolt 20, and the head portion 20 b is inserted into the inner portion of the shaft portion 20 a via the washer 21. It inserts in the insertion hole 18 until it contacts the peripheral surface 13a. As a result, a plurality of heads 20 b protrude inward on the inner peripheral surface 13 a of the opening 13 and are arranged at predetermined intervals along the circumferential direction of the opening 13.

  On the other hand, a plurality of cotters 23 are provided along the circumferential direction of the steel frame 15 on the surface of the flange 15a of the steel frame 15 of the reinforcing frame 14 provided with the steel frame 15 and braces 16 and 17 provided in the steel frame 15. Arranged at predetermined intervals and fixed by welding. In addition, the space | interval of the adjacent cotters 23 and 23 is set equal to the space | interval of the adjacent head parts 20b and 20b arrange | positioned at the internal peripheral surface 13a of the opening part 13. As shown in FIG.

Next, the reinforcing frame 14 having the cotter 23 welded and fixed to the outer peripheral surface of the steel frame 15 (the surface of the flange 15a) is disposed in the opening 13 with a predetermined gap S between the inner peripheral surface 13a. . At this time, the reinforcing frame 14 is disposed in the opening 13 such that the heads 20 b and the cotters 23 of the first bolts 20 are alternately disposed along the circumferential direction of the opening 13.
Next, the adjacent cotters 23, 23 and the head portion 20 b of the first bolt located between them are surrounded by the gap S as seen from a plane parallel to the inner peripheral surface 13 a of the opening 13, and the reinforcing bars 25 are surrounded. Place. In addition, a plurality of reinforcing bars 25 are arranged along the circumferential direction of the opening 13, and the end portions overlap each other.

  Next, after installing a dam plate (not shown) on both sides of the gap S, the gap S is filled with a non-shrink mortar 26. After the mortar is cured, the dam plate is removed and the construction is finished.

According to the form of 1st Embodiment, while inserting the axial part 20a into the insertion hole 18 formed in the internal peripheral surface 13a of the opening part 13, the head part 20b is connected to the internal peripheral surface 13a. Since the plurality of cotters 23 are protruded into the gap S and fixed by welding on the outer peripheral surface of the steel frame 15, the inner periphery of the opening 13 is protruded from the gap S to the gap S. The projecting length of the head 20b of the first bolt 20 from the surface 13a can be made shorter than the projecting length of the conventional post-installed anchor, and the projecting length of the cotter 23 from the outer peripheral surface of the steel frame 15 can be It can be shortened compared to the protruding length of the stud.
Therefore, since the gap S between the inner peripheral surface 13a of the opening 13 and the steel frame 15 can be reduced as compared with the conventional case, the filling amount of the expensive no-shrink mortar 26 can be reduced, and the cost can be suppressed. .

The heads 20b and the cotters 23 of the first bolts 20 are alternately arranged along the circumferential direction of the opening 13, and are located in the gap S between the adjacent cotters 23 and 23 and between them. A ring-shaped reinforcing bar 25 is disposed so as to surround the head 20b of the first bolt 20, and a non-shrink mortar 26 is filled therein. Therefore, the non-shrinkable mortar 26 can be split and reinforced to prevent damage to the mortar. Then, the head 20a and the cotter 23 of the first bolt 20 function as shear resistance elements via the non-shrink mortar 26, and transmit the shearing force one-on-one with their supporting pressure. Even if there is a finishing mortar, shear force can be transmitted reliably. Therefore, it is possible to prevent noise, vibration, dust and the like caused by removing the conventional finishing mortar.
Further, since the insertion hole 18 for inserting the shaft portion 20a of the first bolt 20 is formed by drilling the inner peripheral surface 13a of the opening portion 13 with a core drill, a post-installed anchor is provided on the inner peripheral surface of the conventional opening portion. Noise, vibration, dust and the like can be suppressed as compared with the case of drilling the insertion hole.

(Second Embodiment)
5-7 is a figure which shows 2nd Embodiment of the earthquake-proof reinforcement structure based on this invention.
The seismic reinforcement structure shown in these drawings differs from the seismic reinforcement structure of the first embodiment in that the second bolt 30 is fixed to the steel frame 15 instead of the cotter 23. This point will be described in detail, and the same reference numerals are given to the same configurations as those of the seismic reinforcement structure of the first embodiment, and the description thereof will be simplified or omitted.

A plurality of second bolts 30 are arranged in the steel frame 15 at a predetermined interval along the circumferential direction of the steel frame 15.
The second bolt 30 is fixed to the flange 15a by inserting the shaft portion 30a into a hole formed in the flange 15a of the steel frame 15 and tightening the nuts 31, 31 screwed into the shaft portion 30a. ing.
The second bolt 30 is inserted into a hole formed in the flange 15a from the back side of the flange 15a, and the nuts 31, 31 are screwed as so-called double nuts to the shaft portion 30a protruding to the front side of the flange 15a. Has been tightened. As a result, the nuts 31 protrude from the flange 15a into the gap S.
One nut 31 is spot-welded to the flange 15 a, and the other nut 31 is spot-welded to the one nut 31. As a result, the nuts 31 are not loosened.
In addition, washers 32, 32 are extrapolated on the shaft portion 30a of the second bolt 30, and one washer 32 is interposed between the head 30b of the second bolt 30 and the lower surface of the flange 15a. The other washer 32 is interposed between the upper surface of the flange 15 a and the nut 31.

  Two second bolts 30 are arranged at a predetermined interval in the width direction of the flange 15a (vertical direction in FIG. 6) and at a position sandwiching the web 15b. That is, two rows of holes are formed in the flange 15a. The shaft portions 30a of the second bolts 30 are inserted into these holes, and the nuts 31 and 31 screwed into the shaft portions 30a are tightened to the flange 15a. The second bolt 30 is fixed.

The heads 20 b of the first bolts 20 and the nuts 31 screwed into the second bolts 30 are alternately arranged along the circumferential direction of the opening 13.
In the gap S, the reinforcing bars 25 are arranged so as to surround the nut 31 and the head 20b of the first bolt 20 located between them as viewed from a plane parallel to the inner peripheral surface 13a of the opening 13. Has been.
In the reinforcing bar 25, the ends of the adjacent reinforcing bars 25, 25 are overlapped in the width direction of the gap S (vertical direction in FIG. 5) on the side of the nut 31. That is, a plurality of reinforcing bars 25 are arranged along the circumferential direction of the opening 13, and end portions thereof overlap each other.
In addition, a part of the head 20 b of the first bolt 20 enters inside the one reinforcing bar 25, and a part of the nut 31 enters inside the other reinforcing bar 25.
The gap S is filled with non-shrink mortar 26. As a result, the opening 13, that is, the existing concrete structure 10 and the reinforcing frame 14 are integrated.

When constructing the seismic reinforcement structure of the concrete structure of the second embodiment, it is performed in the same manner as the seismic reinforcement structure of the first embodiment.
That is, a plurality of insertion holes 18 are formed at predetermined intervals along the circumferential direction of the opening 13 on the inner peripheral surface 13 a of the opening 13, and the shaft portion 20 a of the first bolt 20 is inserted into each insertion hole 18. By fixing with an adhesive, a plurality of heads 20b are projected inwardly on the inner peripheral surface 13a of the opening 13 and arranged at a predetermined interval along the circumferential direction of the opening 13.

  On the other hand, the shaft portion 30a of the second bolt 30 is inserted into the flange 15a through the flange 15a of the steel frame 15 of the reinforcing frame 14 provided with the steel frame 15 and braces 16 and 17 provided in the steel frame 15. At the same time, the second bolt 30 is fixed by tightening the nuts 31, 31 screwed into the shaft portion 30a. As a result, the nuts 31, 31 protrude from the flange 15 a into the gap S and are arranged at predetermined intervals along the circumferential direction of the steel frame 15.

Next, the reinforcing frame 14 in which the second bolt 30 is fixed to the flange 15a of the steel frame 15 is disposed in the opening 13 with a predetermined gap S between the inner peripheral surface 13a. At this time, the reinforcing frame 14 is disposed in the opening 13 such that the heads 20 b and the nuts 31 of the first bolts 20 are alternately disposed along the circumferential direction of the opening 13.
Next, the reinforcing bars 25 are so surrounded as to surround the adjacent nuts 31, 31 and the head portion 20 b of the first bolt located between them in the gap S, as viewed from a plane parallel to the inner peripheral surface 13 a of the opening 13. Place. In addition, a plurality of reinforcing bars 25 are arranged along the circumferential direction of the opening 13, and the end portions overlap each other.
Next, after installing a dam plate (not shown) on both sides of the gap S, the gap S is filled with a non-shrink mortar 26. After the mortar is cured, the dam plate is removed and the construction is finished.

According to the second embodiment, the first bolt 20 inserts the shaft portion 20a into the insertion hole 18 formed in the inner peripheral surface 13a of the opening portion 13 and the head portion 20b from the inner peripheral surface 13a. A second bolt 30 is inserted into the flange 15a of the steel frame 15 and the shaft 30a is inserted into the flange 15a and screwed into the shaft 30a. 31 is fastened to the flange 15a by tightening, and the nut 31 protrudes from the flange 15a into the gap S. Therefore, the protruding length of the head 20b of the first bolt 20 from the inner peripheral surface 13a of the opening 13 The length of the nut 31 from the flange 15a of the steel frame 15 can be made shorter than the length of protrusion of a conventional post-installed anchor. Compared to it can be shortened.
Therefore, since the gap between the inner peripheral surface 13a of the opening 13 and the steel frame 15 can be reduced as compared with the conventional case, the filling amount of the expensive no-shrink mortar 26 can be reduced, and the cost can be suppressed.

  Further, the heads 20b of the first bolts 20 and the nuts 31 screwed into the second bolts 30 are alternately arranged along the circumferential direction of the opening 13, and the nuts 31 adjacent to the gap S are adjacent to each other. , 31 and a head 20b of the first bolt 20 located between them, a ring-shaped reinforcing bar 25 is arranged, and a non-shrink mortar 26 is filled. Therefore, the non-shrink mortar 26 can be split and reinforced to prevent damage to the mortar. Then, the head 20a and the nut 31 of the first bolt 20 function as shear resistance elements via the non-shrink mortar 26, and transmit the shearing force one-on-one with their supporting pressures. Shear force can be transmitted reliably even with the finished mortar. Therefore, it is possible to prevent noise, vibration, dust and the like resulting from the removal of the conventional finishing mortar.

  In the present embodiment, the nut 31 screwed into the second bolt 30 is protruded from the flange 15a into the gap S. Instead, the head 30b of the second bolt 30 is spaced from the flange 15a. You may make it project to S. In this case, it is preferable that the height of the head 30b is set to be substantially equal to the nuts (double nuts) 31 and 31.

(Third embodiment)
8-10 is a figure which shows 3rd Embodiment of the earthquake-proof reinforcement structure based on this invention.
The seismic reinforcement structure shown in these figures differs from the seismic reinforcement structure of the first embodiment in the configuration of the reinforcing bars arranged in the gap S. Therefore, the configuration of the reinforcing bars will be described in detail below. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

First, similarly to the first embodiment, the heads 20 b and the cotters 23 of the plurality of first bolts 20 are alternately arranged in the circumferential direction of the opening 13.
In the gap S, linear rebars 35, 35 are arranged in parallel with the cotters 23 and the heads 20b of the first bolts 29 arranged alternately in the circumferential direction of the opening 13 in the width direction of the flange 15a. Has been placed. These reinforcing bars 35 and 35 extend to the vicinity of the ends of the columns 11 and beams 12 constituting the opening 13, and the ends of the reinforcing bars 35 and 35 are U-shaped so that these ends are connected to each other. The reinforcing bars 36 are arranged so as to overlap the ends of the reinforcing bars 35 and 35.
The gap S is filled with non-shrink mortar 26. As a result, the opening 13, that is, the existing concrete structure 10 and the reinforcing frame 14 are integrated.

  According to the present embodiment, the same effect as in the first embodiment can be obtained. Further, as compared with the ring-shaped reinforcing bar 25 of the first embodiment, there is an advantage that the reinforcing bars 35 and 36 are easily arranged, that is, the construction is simplified.

(Fourth embodiment)
FIGS. 11-13 is a figure which shows 4th Embodiment of the earthquake-proof reinforcement structure based on this invention.
Since the seismic reinforcement structure shown in these drawings is different from the seismic reinforcement structure of the second embodiment in the configuration of the reinforcing bars arranged in the gap S, the configuration of the reinforcing bars will be described in detail below. The same components as those of the seismic reinforcement structure of the second embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

First, similarly to the second embodiment, the heads 20b of the first bolts 20 and the nuts 31 screwed into the second bolts 30 are alternately arranged along the circumferential direction of the opening 13. ing.
In the gap S, nuts 31, 31 screwed into the heads 20 b of the first bolts 20 and the second bolts 30 arranged alternately in the circumferential direction of the opening 13 are sandwiched in the width direction of the flange 15 a. The linear reinforcing bars 35 are arranged in parallel with each other. These reinforcing bars 35 and 35 extend to the vicinity of the ends of the columns 11 and beams 12 constituting the opening 13, and the ends of the reinforcing bars 35 and 35 are U-shaped so that these ends are connected to each other. The reinforcing bars 36 are arranged so as to overlap the ends of the reinforcing bars 35 and 35.
The gap S is filled with non-shrink mortar 26. As a result, the opening 13, that is, the existing concrete structure 10 and the reinforcing frame 14 are integrated.

  According to the present embodiment, the same effects as those of the second embodiment can be obtained. Further, as compared with the ring-shaped reinforcing bar 25 of the second embodiment, there is an advantage that the reinforcing bars 35 and 36 are easily arranged, that is, the construction is simplified.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a first embodiment of a seismic reinforcement structure according to the present invention, with a part of the seismic reinforcement structure broken. It is an expansion front sectional view which shows the principal part of a seismic reinforcement structure. FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a sectional view taken along line BB in FIG. The 2nd Embodiment of the earthquake-proof reinforcement structure which concerns on this invention is shown, and it is an expansion front sectional view which shows the principal part of an earthquake-proof reinforcement structure. FIG. 6 is a cross-sectional view taken along line CC in FIG. FIG. 6 is a sectional view taken along line DD in FIG. The 3rd Embodiment of the earthquake-proof reinforcement structure which concerns on this invention is shown, and it is an expansion front sectional view which shows the principal part of an earthquake-proof reinforcement structure. FIG. 9 is a sectional view taken along line A′-A ′ in FIG. 8. FIG. 9 is a sectional view taken along line B′-B ′ in FIG. 8. The 4th Embodiment of the earthquake-proof reinforcement structure which concerns on this invention is shown, and it is an expansion front sectional view which shows the principal part of an earthquake-proof reinforcement structure. FIG. 12 is a sectional view taken along line C′-C ′ in FIG. 11. FIG. 12 is a sectional view taken along line D′-D ′ in FIG. 11. An example of the conventional seismic reinforcement structure is shown, and is a front view in which a part of the seismic reinforcement structure is broken. It is an expansion front sectional view which shows the principal part of a seismic reinforcement structure. It is the EE sectional view taken on the line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Concrete structure 11 Column 12 Beam 13 Opening 13a Inner peripheral surface 14 Reinforcement frame 15 Steel frame 15a Flange 16, 17 Brace 18 Insertion hole 20 1st bolt 20a Shaft 20b Head 22 Adhesive 23 Cotter 25 Ring-shaped Reinforcement 26 Non-shrink mortar (mortar)
30 Second bolt 30a Shaft 30b Head 31 Nut 35, 36 Rebar

Claims (4)

A reinforcing frame having a steel frame and braces provided in the steel frame in an opening surrounded by columns and beams of the concrete structure has a predetermined gap between the opening and the inner peripheral surface of the opening. Arranged with
A plurality of insertion holes are formed in the inner peripheral surface of the opening by cutting at predetermined intervals along the circumferential direction of the opening,
In the insertion hole, the first bolt inserts the shaft portion and the head protrudes from the inner peripheral surface into the gap and is fixed by an adhesive,
On the outer peripheral surface of the steel frame, a plurality of cotters are arranged at predetermined intervals along the circumferential direction of the steel frame and protruded into the gap and fixed by welding,
The heads of the first bolts and the cotters are alternately arranged along the circumferential direction of the opening,
An anti-seismic reinforcement structure for a concrete structure, wherein the gap is filled with mortar. A reinforcing frame having a steel frame and braces provided in the steel frame in an opening surrounded by columns and beams of the concrete structure has a predetermined gap between the opening and the inner peripheral surface of the opening. Arranged with
A plurality of insertion holes are formed in the inner peripheral surface of the opening by cutting at predetermined intervals along the circumferential direction of the opening,
In the insertion hole, the first bolt inserts the shaft portion and the head protrudes from the inner peripheral surface into the gap and is fixed by an adhesive,
In the steel frame, a plurality of second bolts are arranged at predetermined intervals along the circumferential direction of the steel frame,
The second bolt is fixed to the flange by inserting a shaft portion of the second bolt into the flange of the steel frame and tightening a nut screwed into the shaft portion.
The head of the second bolt or the nut protrudes from the flange into the gap;
The heads of the first bolts and the heads of the second bolts or the nuts are alternately arranged along the circumferential direction of the opening,
An anti-seismic reinforcement structure for a concrete structure, wherein the gap is filled with mortar.   The seismic reinforcement structure for a concrete structure according to claim 1 or 2, wherein the insertion hole is formed by drilling an inner peripheral surface of the opening with a core drill.   The seismic reinforcement structure for a concrete structure according to any one of claims 1 to 3, wherein a reinforcing bar is disposed in the gap.

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