JP4933229B2 - Seismic reinforcement structure - Google Patents

Description

  The present invention relates to a seismic reinforcement structure provided to improve the seismic strength of existing buildings.

Conventionally, various structures including braces or braces have been proposed for the seismic reinforcement structure in order to improve the seismic strength of existing buildings. For example, the one disclosed in Patent Document 1 is a structure in which a brace having a yielding part is attached to a frame composed of columns and beams, and it is possible to replace only the yielding member that has surrendered in the event of an earthquake and finished its role. It is what. Moreover, what was disclosed by the cited reference 2 is the structure which tensioned the reinforcement pillar and the reinforcement foundation via the tension material. Moreover, what was disclosed by the cited reference 3 installs a PC out frame in the construction surface of the existing building, and increases seismic strength.
Japanese Patent Laid-Open No. 11-61982 Japanese Patent Laid-Open No. 2005-163432 "Prestressed concrete" Vol.48, No.4, July 2006, P62-65, Gihodo Publishing Co., Ltd., Prestressed Concrete Technology Association

However, in the conventional seismic reinforcement structure described above, for example, the one disclosed in Patent Document 1 has a drawback that the width of the brace hinders daylighting and ventilation.
Moreover, in what was disclosed by patent document 2, since it was the structure which tensions a tension material with a reinforcement foundation and a reinforcement pillar, it was necessary to make it a large and strong foundation structure. In addition, when constructing in a three-story building, the length of the reinforcing foundation in the direction of girder was required to be 25 m or more.
Furthermore, in what was disclosed by the nonpatent literature 1, it was necessary to enlarge the thickness dimension of PC out frame. Also, the weight of the foundation had to be increased accordingly.

  This invention has been proposed in view of the above, and is excellent in daylighting and ventilation, and enhances seismic strength by reducing the thickness of columns and beams without increasing the weight and length of the reinforcing foundation. An object is to provide a seismic reinforcement structure that can be used.

In order to achieve the above-mentioned object, the present invention is an earthquake-proof reinforcement structure constructed along the construction surface of an existing building, and includes reinforcing bars made of vertical bars and concrete arranged at positions other than the windows of the existing building, and existing a reinforcing beam made of reinforcing bars and concrete is placed in a position other than the window of the building, formed Rutotomoni reinforcement base portion and extended in the horizontal direction while being vertically of the reinforcing pillars, the reinforcing post A cylindrical fastening bracket having a polygonal cross section is embedded at the intersection with the reinforcing beam, and at least a pair of opposing corners of the frame structure composed of the reinforcing column and the reinforcing beam is interposed via the fastening bracket. It is characterized by stretching a tension material.

Further, in the present invention, the fastening bracket is an unequal side octagonal cylinder having a short side and a long side in cross section, and holding and fixing the end of the tendon with the long side of the octagon. Features.

Further, in the present invention, the tendon, tendon opposite arranged to intersect between the corners of Rutotomoni the intersection of the frame structure, and characterized by being arranged by shifting the position in the depth direction To do.

  Since this invention consists of an above-described structure, there can exist an effect which is demonstrated below.

In the present invention, the seismic reinforcement structure is constructed along the construction surface of the existing building, and the reinforcement pillars made of vertical bars and concrete arranged at positions other than the window part of the existing building and the window part of the existing building a reinforcing beam made of arranged reinforcing bars and concrete position of the reinforcing pillars erected is formed from a reinforcing base portion that extends in the horizontal direction together with Rutotomoni, intersection of the reinforcing beam of the reinforcing pillar A cylindrical fastening member having a polygonal cross section is embedded in the tension member, and a tension member is stretched over the fastening member through at least a pair of opposing corners of the frame structure composed of the reinforcing column and the reinforcing beam. In addition, the earthquake resistance of the existing building is increased, and there is no possibility of causing deterioration in the use environment because of excellent daylighting and ventilation. Moreover, the self-weight of a reinforcement base part can be made small compared with the past. Furthermore, the length of the reinforcing foundation can be made the same as that of a normal reinforcing beam, and the weight can be reduced. Moreover, weight reduction of the reinforcing column and the reinforcing beam can be achieved. Further, in the present invention, a polygonal fastening bracket is disposed at the intersection of the reinforcing column with the reinforcing beam, and the tension member is fastened through the fastening bracket. And it can be securely fastened.

In the present invention, the fastening bracket is an unequal side octagonal cylinder having a short side and a long side in cross section, and the end of the tendon is held and fixed by the long side of the octagon . When fastening the end of the tendon, either side is perpendicular to the tendon and can be securely fastened.

In the present invention, the tendon, tendon facing crossed are arranged Rutotomoni the cross between corners of the frame structure, since the arranged by shifting the position in the depth direction, seismic performance Can be improved. Moreover, the crossing tendons can be made non-contact with each other, and there is no possibility of adversely affecting the tension.

  The tension column is composed of a reinforcement column, a reinforcement beam, and a reinforcement foundation, and tension material is stretched at least a pair of opposing corners of the frame structure composed of the reinforcement column and the reinforcement beam. While suppressing, it can ensure lighting property and ventilation.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an embodiment. FIG. 1 is a front view of a seismic reinforcement structure according to the present invention, and FIG. 2 is an enlarged front view of a main part of the seismic reinforcement structure of the present invention. Here, the seismic reinforcement structure 10 is constructed along the construction surface of the existing building, and the reinforcing pillar 11 arranged at a position other than the window part of the existing building and the position other than the window part of the existing building. The reinforcing beam 12 and the reinforcing base portion 13 are arranged on each other, and tension members 14 are stretched around at least a pair of opposing corners of the frame structure constituted by the reinforcing column 11 and the reinforcing beam 12. The

  Further, as shown in FIG. 2, a polygonal fastening member 15 is disposed at the intersection of the reinforcing column 11 with the reinforcing beam 12, and the tension member 14 is fastened through the fastening member 15. That is, the fastening bracket 15 is disposed between the longitudinal bars 16 a and 16 b constituting the reinforcing column 11 and between the reinforcing bars 17 a and 17 b constituting the reinforcing beam 12. The fastening fitting 15 has, for example, an octagon shape and is configured such that one side of the octagon is orthogonal to the tendon material 14. The fastening bracket 15 fastens the end of the tension member 14 drawn through the sheath 18 with a washer 19 and a nut 20. Further, as shown in FIG. 3, the fastening bracket 15 is arranged by shifting the positions of the insertion holes 21 a and 21 b into which the left and right tension members 14 are drawn in the depth direction so that the positions of the tension members 14 are shifted in the depth direction. Yes.

  FIG. 4 is an explanatory view showing a tension mechanism 22 used in the seismic reinforcement structure of the present invention. In the present embodiment, the tension mechanism 22 includes a reaction force jig 23 having a U-shaped cross section, a jack 24, a bearing plate 25, nuts 26 and 27, a coupler 28, and the like. One end of the tension member 14 inserted from both end plates of the reaction force jig 23 is screwed with a nut 27, and the other end is screwed with a jack 24, a pressure plate 25, and a coupler 28. The tendon 14 is temporarily fixed with a predetermined gap, for example, about 25 mm. In such a state, the jack 24 is extended, the tension material is tensioned to eliminate the gap, and then the coupler 28 is connected. After the tendon member 14 is connected by the coupler 28, the reaction force jig 23 is removed and the cladding tube 29 is covered.

  FIG. 5 is an explanatory view showing another embodiment of the tension mechanism used in the seismic reinforcement structure of the present invention. In the present embodiment, the tension mechanism 30 includes two support plates 32a and 32b that are pivotally supported by a support rod 31 and a jack that is rotatably attached to the support plates about a rotation axis. 33, nuts 34 and 35, a coupler 36, and the like. The tension mechanism 30 configured as described above inserts the tension material 14 into the mounting groove 32c of the bearing plate 32a, temporarily fixes it with the nut 34, and screws the coupler 36 together. Further, the other end of the tension member 14 is inserted into the mounting groove 32d of the bearing plate 32b and temporarily fixed with a nut 35. At this time, the interval between the tendon members 14 is a predetermined gap as described above, for example, about 25 mm. Next, the jack 33 is operated so that the space between the pressure bearing plates 32a and 32b on the side where the tension member 14 is temporarily fixed is made closer. When the tension members 14 approach each other and are tensioned, the coupler 36 is operated to connect the two. After connecting the tension member 14 with the coupler 36, the tension mechanism 30 is removed and the cladding tube 29 is covered from above.

  Next, the construction method of the seismic reinforcement structure comprised as mentioned above is demonstrated. First, as shown in FIG. 6 (a), a reinforcing foundation (underground beam) 13 is constructed in parallel with the existing building. A tension member (anchor) 14 having a clamped tip is embedded in the reinforcing base 13 at a predetermined position. After the reinforcing base portion 13 is cured, the reinforcing pillars 11 are erected at a predetermined interval as shown in FIG. The reinforcing pillar 11 is manufactured in advance as a PCa member at the factory, and the tension material 14 is embedded therein. Next, the reinforcing beam 12 shown in FIG. 6C is attached between the reinforcing columns 11. The reinforcing beam 12 is also manufactured in advance at the factory as a PCa member. In FIG. 6 (d), joints are applied to the joints between the reinforcing columns 11 and the reinforcing beams 12 with non-shrinking mortar and the like, and after the PC steel material is inserted into the reinforcing columns 11 and the reinforcing beams 12, the joint is strained. The column base is grouted. After the frame structure is formed with the reinforcing columns and the reinforcing beams as described above, the tension members 14 disposed obliquely are completed by being tensioned as shown in FIG.

  FIG. 7: is principal part sectional drawing which shows a connection part with the existing building in the earthquake-proof reinforcement structure of this invention. In the seismic reinforcement structure of the present invention, the existing building 37 and the reinforcing beam 12 are connected by the connecting bottle 38. Bottle holes 39 are formed at appropriate intervals between the reinforcing beams 12, and bottle holes 40 are also formed in the existing building 37 facing each other. A grout material such as a non-shrink mortar is interposed at a portion of the reinforcing beam 12 that comes into contact with the existing building 37.

  FIG. 8 is an explanatory diagram showing an example in which the seismic reinforcement structure of the present invention is installed in an existing building. In the seismic reinforcement structure 10 of the present invention, the reinforcing pillar 11, the reinforcing beam 12, and the reinforcing foundation part 13 are arranged at a position other than the window part on the front side of the existing building 37, for example. By disposing in this way, the seismic strength can be improved without impairing the daylighting property and ventilation. In addition, although the above example demonstrated the case where an earthquake-proof reinforcement structure was installed in a part of construction surface of the existing building, you may install in the whole construction surface.

FIG. 1 is a front view of a seismic reinforcement structure according to the present invention. FIG. 2 is an enlarged front view of the main part of the seismic reinforcement structure. FIG. 3 is a cross-sectional view showing a column portion in the seismic reinforcement structure. FIG. 4 is an explanatory view showing a tension mechanism used in the seismic reinforcement structure. FIG. 5 is an explanatory view showing another embodiment of the tension mechanism used in the seismic reinforcement structure. FIG. 6 is an explanatory view showing a construction procedure in the seismic reinforcement structure. FIG. 7: is principal part sectional drawing which shows a connection part with the existing building in the same earthquake-proof reinforcement structure. FIG. 8 is an explanatory diagram showing an example in which the seismic reinforcement structure is installed in an existing building.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Seismic reinforcement structure 11 Reinforcement pillar 12 Reinforcement beam 13 Reinforcement base part 14 Tension material 15 Fastening bracket 16 Long bar 17 Reinforcement 18 Sheath 19 Washer 20 Nut 21a, b Insertion hole 22, 30 Tension mechanism 23 Reaction force jig 24 Jack 25 Support plate 26, 27 Nut 28 Coupler 29 Clad tube 31 Support rod 32 Support plate 33 Jack 36 Coupler 37 Existing building 38 Connected bottle 39 Bottle hole

Claims (3)

It is a seismic reinforcement structure that is built along the construction surface of an existing building, and is placed at a position other than the window of the existing building, and a reinforcing column made of vertical streaks and concrete placed at a position other than the window of the existing building. a reinforcing beam made of the rebar and concrete, the reinforcing pillars erected consists a reinforcing base portion that extends in the horizontal direction together with the Rutotomoni, polygonal cross section at the intersection of the reinforcing beam of the reinforcing pillar And a tension member is stretched over at least a pair of opposing corners of the frame structure composed of the reinforcing column and the reinforcing beam. Seismic reinforcement structure. 2. The fastening bracket is an octagonal cylinder having an unequal side having a short side and a long side in cross section, and the end of the tendon is held and fixed by the long side of the octagon. Seismic reinforcement structure described in 1. The tendon, tendon facing crossed are arranged Rutotomoni the cross between corners of the frame structure according to claim 1 or 2, characterized in that arranged by shifting the position in the depth direction Seismic reinforcement structure described in 1.

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