JP5038686B2 - Seismic reinforcement structure for existing buildings - Google Patents

Description

  The present invention relates to a seismic reinforcing structure for an existing building in which a reinforcing frame is incorporated in a column beam frame of an existing building.

In recent years, for various existing buildings such as buildings that have been designed in accordance with the old Building Standards Law and buildings that are concerned about aging, there are various reinforcing means that improve the earthquake resistance by reinforcing the frame. It has been implemented.
As an example of such reinforcing means, an existing reinforced concrete structure is obtained by bringing a steel plate into contact with the surface of a member constituting an existing reinforced concrete structure and integrating the steel plate and the member with a post-installed anchor. A technique that can improve the seismic resistance of a housing in an object is known (see, for example, Patent Document 1).
Japanese Patent Application Laid-Open No. 09-221918

By the way, in the reinforcing structure as in the above-mentioned Patent Document 1, for example, the post-construction anchor that is mechanically fixed to the hole wall by opening the extension portion in the hole drilled in the pillar, the beam or the like includes the steel plate and the member. It is used as a technology to integrate.
However, when installing construction anchors on pillars, beams, etc. after this, not only drilling with a drill etc., but also post-construction anchors must be driven with a hammer to open the extension, so during reinforcement work, There was a problem that large noise and vibration were generated.

However, if post-installation anchors are not used to reduce noise and vibration, the steel plate and the existing reinforced concrete structure column beam cannot be firmly connected. there were.
Therefore, it is desirable to develop a technology that enables reliable seismic reinforcement without using construction anchors after connecting steel plates (hereinafter referred to as reinforcement frames) and existing reinforced concrete structures (hereinafter referred to as existing buildings). It was.

  The problem of the present invention is that, unlike the prior art, it is possible to reliably perform seismic reinforcement of existing buildings without using post-installed anchors, and to further reduce noise and vibration during seismic reinforcement work. The purpose is to provide a seismic reinforcement structure for existing buildings.

The invention according to claim 1 is an earthquake-proof reinforcement structure for an existing building in which a reinforcement frame 2 is incorporated in a column beam frame 1 of an existing building, for example, as shown in FIGS. 1 and 2.
A connecting means for connecting the column beam frame 1 and the reinforcing frame 2 is provided between the column beam frame 1 and the reinforcing frame 2, and these connecting units are engaged in directions approaching each other. A plurality of wedge members 3, 4 having inclined surfaces 3a, 4a that overlap each other,
The wedge members 3 and 4 are slid relative to each other along the inclined direction of the inclined surfaces 3a and 4a while being closely engaged so that the inclined surfaces 3a and 4a overlap with each other. While being pressed against the beam frame 1, the other wedge member 4 is pressed against the reinforcing frame 2 ,
The one wedge member 3 has a friction material 3c attached to the pressure contact surface 3b to the column beam frame 1, and the other wedge member 4 has a friction to the pressure contact surface 4b to the reinforcing frame 2. A friction material 7 is attached to the side surface of the column beam frame 1 facing the pressure contact surface 3b of the one wedge member 3, and a pressure contact surface 4b of the other wedge member 4 is attached. Friction material 8 is attached to the side of reinforcing frame 2 facing
A grout material is injected and filled in a gap between the inner peripheral surface of the column beam frame 1 and the outer peripheral surface of the reinforcing frame 2 .

According to the first aspect of the present invention, the wedge members are slid with respect to each other along the inclined direction of the inclined surfaces while being closely engaged so that the inclined surfaces overlap each other. Is moved so as to be relatively separated along the inclination direction of the inclined surface, so that one wedge member is pressed against the column beam frame and the other wedge member is pressed against the reinforcing frame. Become. Accordingly, the plurality of wedge members can be firmly wedged between the column beam frame and the reinforcement frame, and the column beam frame and the reinforcement frame can be firmly connected and integrated by the wedge members. it can.
As a result, unlike the conventional case, the post-beam frame and the reinforcement frame can be integrated without using post-installed anchors, so that the existing buildings can be reliably seismically strengthened, and the seismic reinforcement work It is possible to further reduce noise and vibration during the operation.

In addition, when the inclination angles of the inclined surfaces of the plurality of wedge members are loose, the distance that the wedge members separate from each other is shorter than the distance that the wedge members slide along the inclined surface. On the other hand, when the inclination angle of the inclined surfaces of the plurality of wedge members is steep, the distance that the wedge members are separated from each other is longer than the distance that the wedge members slide along the inclined surface. Therefore, when changing the pressure-contact strength of the plurality of wedge members to the column beam frame and the reinforcement frame, or depending on the distance between the column beam frame and the reinforcement frame, an inclined surface set to an optimum inclination angle is provided. By using a plurality of wedge members, an optimum shearing force can be applied to the column beam frame and the reinforcement frame when the column beam frame and the reinforcement frame are firmly pressed and connected by the plurality of wedge members. .
In addition, since the friction material is attached to the one wedge member on the pressure contact surface to the column beam frame, the friction material generates a friction force between the one wedge member and the column beam frame. be able to. Further, since the friction material is attached to the pressure contact surface to the reinforcing frame, the friction material is generated between the other friction material and the reinforcing frame by the other wedge member. it can. Thus, a strong connection state between the column beam frame and the reinforcing frame by the plurality of wedge members can be maintained.

  As shown in FIGS. 2 (a) and 2 (b), for example, the invention according to claim 2 is the seismic reinforcement structure for an existing building according to claim 1, wherein the plurality of wedge members 3 and 4 are wedges. A bolt shaft 5 provided penetrating through the shaft center of the members 3 and 4 is slidably inserted in a state having play, and the wedge members 3 and 4 are provided at both ends of the bolt shaft 5. Tightening nuts 6 and 6 that are tightened in a direction approaching each other are screwed together.

According to the second aspect of the present invention, since the plurality of wedge members are slidably inserted in a state having play with respect to the bolt shaft portion, the wedge members are inclined with respect to the inclined surface. When they are slid along each other, they can be moved away from each other along the inclined direction of the inclined surface by the amount of play with respect to the bolt shaft portion.
When the plurality of wedge members are tightened by the tightening nuts, the one wedge member moves toward the column beam frame by the amount of play with respect to the bolt shaft portion, so that the one wedge member and the bolt shaft are moved. A supporting pressure acts on the contact portion with the portion, and a shearing force proportional to the supporting pressure can be transmitted to the pressing surface of the one wedge member to the column beam frame. On the other hand, when the other wedge member moves toward the reinforcement frame by the amount of play with respect to the bolt shaft portion, a support pressure acts on the contact portion between the other wedge member and the bolt shaft portion, and A proportional shear force can be transmitted to the pressure contact surface of the other wedge member to the reinforcement frame.
As a result, the plurality of wedge members can be wedged more firmly between the column beam frame and the reinforcement frame, and the column beam frame and the reinforcement frame are more firmly connected and integrated by the wedge members. can do.

  Further, since the supporting pressure of the plurality of wedge members can be adjusted by adjusting the tightening torque by the tightening nut, the shearing force transmitted to the pressure contact surface of the one wedge member to the column beam frame can be adjusted. While being able to adjust, the shearing force transmitted to the press-contact surface to the reinforcement frame of said other wedge member can be adjusted. As a result, an optimum shearing force when the column beam frame and the reinforcement frame are firmly connected by the plurality of wedge members can be applied to the column beam frame and the reinforcement frame.

  According to the present invention, unlike the conventional case, it is possible to integrate the column beam frame and the reinforcing frame without using post-construction anchors, so that the seismic reinforcement of the existing building can be reliably performed, It becomes possible to further reduce noise and vibration during earthquake-proof reinforcement work.

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 and 2, the seismic reinforcement structure for an existing building in the present embodiment is a structure in which a reinforcement frame 2 is incorporated in a column beam frame 1 of the existing building. A connecting means for connecting the column beam frame 1 and the reinforcing frame 2 is provided between the reinforcing frame 2 and the connecting means is formed by engaging the inclined surfaces 3a, 3a, A plurality of wedge members 3, 4 having 4 a are provided, and these wedge members 3, 4 are brought into close engagement with each other so that the inclined surfaces 3 a, 4 a overlap with each other along the inclined direction of the inclined surfaces 3 a, 4 a. By sliding each other, one wedge member 3 is pressed against the column beam frame 1 and the other wedge member 4 is pressed against the reinforcing frame 2.

  Here, the existing building of the present embodiment is a building made of, for example, a reinforced concrete structure or a steel-framed reinforced concrete structure, and a plurality of columns 1a, 1a standing at intervals and between the adjacent columns. A column beam frame 1 is provided which is formed in a rectangular shape by a plurality of beams 1b and 1b which are installed at intervals in the vertical direction.

  As shown in FIG. 1, a reinforcing frame 2 formed in a rectangular frame shape is incorporated in the column beam frame 1, and this reinforcing frame 2 is formed by assembling constituent materials such as steel frames into a rectangular frame shape. Is formed.

  As described above, the reinforcing frame 2 of the present embodiment is formed in a rectangular frame shape, but is not limited to this, and can be appropriately changed without departing from the gist of the present invention. It is.

That is, as shown in FIG. 3, instead of the reinforcing frame 2, for example, a steel earthquake resistant wall 20 may be provided in the column beam frame 1, and further, as shown in FIG. As an alternative to the frame 2, for example, a brace 21 formed in a substantially inverted Y shape may be provided in the column beam frame 1. As this brace 21, for example, a main body portion 22 located in the upper part in the column beam frame 1, joint fittings 23 and 23 located at both lower ends in the column beam frame 1, the main body part 22 and the joint fitting 23, The brace members 24 and 24 interposed between the main body portion 22 and the brace materials 24 and 24, and the joint fittings 23 and 23 and the brace members 24 and 24 via the pin joint portion 25. Use a bonded one.
According to such a brace 21, one wedge member 3 provided on the upper portion of the main body portion 22 is pressed against the column beam frame 1, and the other wedge member 4 is pressed against the main body portion 22. By connecting the beam frame 1 and the main body 22, the brace materials 24 and 24 that are pin-joined to the main body 22 can be urged toward the lower ends of the column beam frame 1. , 24 can be pressure-bonded to the column beam frame 1.

  Further, when the reinforcing frame 2 is provided, as shown in FIG. 1, not only a plurality of wedge members 3 and 4 are provided on both sides of the reinforcing frame 2, but the reinforcing frame 2 is attached to one of the column beam frames 1. You may make it approach to the pillar 1a side. Thus, by bringing the reinforcing frame 2 toward one of the pillars 1a of the column beam frame 1, it is not necessary to provide the wedge members 3 and 4 on the approached side, so the number of wedge members 3 and 4 to be used is reduced. It is possible to reduce.

  As described above, it is needless to say that what is provided in place of the reinforcing frame 2 of the present embodiment is not limited to the seismic walls 20 and braces 21, and the reinforcing frame 2 of the present embodiment is not limited to the column beam structure. The aspect provided in 1 can be changed as appropriate without departing from the spirit of the present embodiment and is arbitrary.

  The plurality of wedge members 3, 4 which are connecting means provided between the column beam frame 1 and the reinforcing frame 2 are formed in the same wedge shape as shown in FIG. 2 (a). And provided at a plurality of locations between the column beam frame 1 and the reinforcing frame 2.

The plurality of wedge members 3 and 4 include inclined surfaces 3a and 4a that overlap when the wedge members 3 and 4 are engaged with each other.
The inclined surfaces 3a and 4a of the wedge members 3 and 4 take into account the distance between the column beam frame 1 and the reinforcement frame 2, and the plurality of wedge members 3 and 4 provide reinforcement to the column beam frame 1 and the reinforcement. It is set to an optimum inclination angle when the frames 2 are joined by pressure contact.

Further, one wedge member 3 is provided with a pressure contact surface 3 b to the column beam frame 1, and the other wedge member 4 is provided with a pressure contact surface 4 b to the reinforcing frame 2.
The pressure contact surface 3b of the one wedge member 3 is attached with a friction material 3c that generates a frictional force between the one wedge member 3 and the column beam frame 1, and the pressure contact surface of the other wedge member 4 is pressed. A friction material 4 c that generates a friction force between the other wedge member 4 and the reinforcing frame 2 is attached to the surface 4 b.
As a result, a frictional force can be generated between the one wedge member 3 and the column beam frame 1, and a frictional force can be generated between the other wedge member 4 and the reinforcing frame 2. It is possible to maintain a strong connection between the column beam frame 1 and the reinforcing frame 2 by the plurality of wedge members 3 and 4.

  In order to further increase the frictional force by the friction materials 3c and 4c, the friction material 7 is also attached to the side surface of the column beam frame 1 facing the pressure contact surface 3b of the one wedge member 3, and the other The friction material 8 is also attached to the side surface of the reinforcing frame 2 facing the pressure contact surface 4b of the wedge member 4.

Further, through holes 3d and 4d through which bolt shafts 5 to be described later are inserted are formed in the shaft centers of the wedge members 3 and 4, and the through holes 3d and 4d have a diameter larger than that of the bolt shafts 5. It has become.
The bolt shaft portion 5 is inserted into the insertion holes 3d and 4d, and the plurality of wedge members 3 and 4 are slidably inserted into the bolt shaft portion 5 with play. Further, tightening nuts 6 and 6 for screwing the wedge members 3 and 4 closer to each other are screwed to both ends of the bolt shaft portion 5.

  The fastening nuts 6 and 6 are formed to have a larger diameter than the insertion holes 3d and 4d so that the plurality of wedge members 3 and 4 can be easily and reliably fastened by the fastening nuts 6 and 6. Has been. A washer member (not shown) may be provided between the tightening nuts 6 and 6 and the wedge members 3 and 4.

In addition, although the installation direction of the wedge members 3 and 4 of this Embodiment is a state installed in parallel with the length direction of the pillar 1a and the beam 1b, as shown in FIG. 1, it is restricted to this. For example, as shown in FIGS. 5A and 5B, it may be installed in a direction orthogonal to the length direction of the pillar 1a and the beam 1b.
Thus, by setting the installation direction of the wedge members 3 and 4 to a direction orthogonal to the length direction of the column 1a and the beam 1b, as shown in FIG. 5B, the tightening nuts 6 and 6 are connected to the column 1a. And since it comes out outside the side surface of the beam 1b, the tightening operation | work of these clamping nuts 6 and 6 can be performed more easily.

  In order to connect the column beam frame 1 and the reinforcing frame 2 using the plurality of wedge members 3 and 4 as described above, first, the plurality of wedge members 3 and 4 are connected to the column beam frame 1. It is installed at a predetermined position between the reinforcing frame 2. Here, the predetermined position refers to an optimal position at which the column beam frame 1 and the reinforcing frame 2 can be firmly connected, and is not particularly limited. In the present embodiment, as shown in FIG. 1, the plurality of wedge members 3 and 4 are installed between the column beam frame 1 and the vicinity of the corners of the reinforcing frame 2.

Then, as shown in FIGS. 2A and 2B, the plurality of wedge members 3 and 4 installed at the predetermined positions are engaged in directions approaching each other, so that the column beam frame 1 And the reinforcing frame 2 are firmly connected.
When engaging the plurality of wedge members 3 and 4 in the direction approaching each other, as shown in FIG. 2A, the tightening nuts 6 and 6 screwed to both ends of the bolt shaft portion 5 are provided. This is done by tightening. The tightening torque by the tightening nuts 6 and 6 is adjusted to be an optimum value when the column beam frame 1 and the reinforcing frame 2 are pressed and connected by the plurality of wedge members 3 and 4. .

  Then, by tightening the plurality of wedge members 3 and 4 with the tightening nuts 6 and 6 in this way, the plurality of wedge members 3 and 4 are attached to the bolt shaft portion 5 as shown in FIG. And is moved so as to be relatively separated along the inclination direction of the inclined surfaces 3a, 4a by the amount of play with respect to the bolt shaft portion 5.

At this time, one wedge member 3 of the plurality of wedge members 3 and 4 moves toward the column beam frame 1 by the amount of play with respect to the bolt shaft portion 5, so that the one wedge member 3 and the bolt shaft portion are moved. A supporting pressure is applied to the contact portion with 5, and a shearing force proportional to the supporting pressure can be transmitted to the pressure contact surface 3 b of the one wedge member 3 to the column beam frame 1. Further, when the other wedge member 4 moves toward the reinforcing frame 2 by the amount of play with respect to the bolt shaft portion 5, a supporting pressure acts on the contact portion between the other wedge member 4 and the bolt shaft portion 5, and A shearing force proportional to the supporting pressure can be transmitted to the pressure contact surface 4b of the other wedge member 4 to the reinforcing frame 2.
That is, the plurality of wedge members 3, 4 can reliably exert a wedge-fastening effect between the column beam frame 1 and the reinforcement frame 2, and the column beam frame 1 and the reinforcement frame 2 are provided by the wedge members 3, 4. Can be firmly connected and integrated.

  In addition, a grout material (not shown) is injected and filled in the gap between the inner peripheral surface of the column beam frame 1 and the outer peripheral surface of the reinforcing frame 2. The engagement state of the members 3 and 4 is prevented from being released, and the column beam frame 1 and the reinforcing frame 2 are further integrated to improve the earthquake resistance.

According to the present embodiment, the plurality of wedge members 3 and 4 are slid relative to each other along the inclination direction of the inclined surfaces 3a and 4a while being closely engaged so that the inclined surfaces 3a and 4a overlap each other. Thus, since these wedge members 3 and 4 move so as to be relatively separated along the inclined direction of the inclined surfaces 3a and 4a, one wedge member 3 is pressed against the column beam frame 1, The other wedge member 4 is pressed against the reinforcing frame 2. Accordingly, the plurality of wedge members 3 and 4 can be firmly wedged between the column beam frame 1 and the reinforcement frame 2, and the column beam frame 1 and the reinforcement frame 2 can be connected by the wedge members 3 and 4. It can be firmly connected and integrated.
As a result, unlike the conventional case, the column beam frame 1 and the reinforcing frame 2 can be integrated without using post-installed anchors. Noise and vibration during reinforcement work can be further reduced.

It is a front view which shows an example of the earthquake-proof reinforcement structure of the existing building of this invention. The connection means is shown, (a) is a state before engaging a plurality of wedge members, (b) is a state after engaging a plurality of wedge members. It is a front view which shows the other example of the earthquake-proof reinforcement structure of the existing building of this invention. It is a front view which shows the other example of the earthquake-proof reinforcement structure of the existing building of this invention. The other example of the installation direction of a wedge member is shown, (a) is a front view, (b) is a sectional side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Column beam frame 2 Reinforcement frame 3 One wedge member 4 The other wedge member 5 Bolt shaft part 6 Clamping nut

Claims (2)

In the seismic retrofit structure of an existing building in which a reinforcing frame is incorporated in the column beam frame of the existing building,
A connecting means for connecting the column beam frame and the reinforcing frame is provided between the column beam frame and the reinforcing frame, and the connecting means is an inclined surface that overlaps when engaged in a direction approaching each other. A plurality of wedge members provided with
The wedge members are brought into close engagement with each other so that the inclined surfaces overlap with each other and are slid with each other along the inclined direction of the inclined surfaces, whereby one wedge member is pressed against the column beam frame and the other The wedge member is pressed against the reinforcing frame ,
The one wedge member has a friction material attached to the pressure contact surface to the column beam frame, and the other wedge member has a friction material attached to the pressure contact surface to the reinforcing frame, Further, a friction material is attached to the side surface of the column beam frame facing the pressure contact surface of the one wedge member, and a friction material is attached to the side surface of the reinforcing frame facing the pressure contact surface of the other wedge member. And
A seismic reinforcement structure for an existing building, wherein a grout material is injected and filled in a gap between an inner peripheral surface of the column beam frame and an outer peripheral surface of a reinforcing frame .   The plurality of wedge members are slidably inserted in a state having play with respect to bolt shaft portions provided so as to penetrate through the shaft centers of the wedge members, and the wedge shafts are provided at both ends of the wedge shaft portions. The seismic reinforcement structure for an existing building according to claim 1, wherein a fastening nut for fastening the members in a direction approaching each other is screwed together.

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