JP2016216931A - Seismic reinforcement method and seismic reinforcement structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seismic reinforcement method capable of preventing a construction period necessary for seismic reinforcement from being prolonged.SOLUTION: A seismic reinforcement method comprises: an anchor installation process; a bar arrangement process; a reinforcement member installation process; a stud installation process; and a concrete placing process. In the stud installation process, a plurality of first studs are installed on an upper surface of a reinforcement member arranged between a first metallic bar and a second metallic bar in a manner that protrudes above a lower edge of the first metallic bar in a vertical direction; and a plurality of second studs are installed on a lower surface of the reinforcement member in a manner that protrudes below an upper edge of the second metallic stud. In the concrete placing process, a first connection beam is constructed by placing concrete in a first region compartmentalized by the upper face of the reinforcement member including the first metallic bar after the stud installation process and a second connection beam is constructed by placing the concrete in a second region compartmentalized by the lower surface of the reinforcement member including the second metallic bar.SELECTED DRAWING: Figure 3

Description

  The technology disclosed in this specification relates to a seismic reinforcement method.

  In the seismic retrofitting method, in which an existing building with a structure with pillars protruding to the outside, such as a school building, is reinforced on the outer surface of the existing beam of the existing building (hereinafter referred to as the “outer surface”). A connecting beam connected to the existing beam is formed by placing concrete and placing concrete in the area including the reinforcing bar. After that, a reinforcing member such as a steel brace is installed on the connecting beam, and the connecting beam and the reinforcing member are connected by filling a filler such as a non-shrink mortar between the connecting beam and the reinforcing member (patent) Reference 1).

JP 2011-214261 A

  In the conventional seismic reinforcement method, it is necessary to form the connecting beam before installing the reinforcing member, so that the reinforcing member cannot be installed until the concrete placed for forming the connecting beam is cured. There was a problem. Further, in order to connect the installed reinforcing member and the connecting beam, there is a problem that it is necessary to fill and harden the filler between the connecting beam and the reinforcing member. That is, in the conventional seismic reinforcement method, the time required for hardening of the concrete and the time required for hardening of the filler are respectively required, and there is a problem that the construction period required for the earthquake resistance reinforcement is prolonged.

  The present specification discloses a technique capable of solving at least a part of the problems described above.

  The technology disclosed in this specification can be implemented as the following forms.

(1) The seismic reinforcement method disclosed in this specification is a seismic reinforcement method for performing seismic reinforcement of an existing building, and is a surface on the outside side of a first existing beam facing the outside of the existing building. And an anchor placing step for placing an anchor member on the outer surface of the second existing beam positioned below the first existing beam, and an arrangement on the surface of the first existing beam. A first metal bar constituting the first connecting beam and a second metal bar constituting the second connecting beam arranged on the surface of the second existing beam. And a first existing column located between one end side of the first existing beam in the horizontal direction and the first existing column between the first metal bar and the second metal bar in the vertical direction. A reinforcing member installation step of installing a reinforcing member between the second existing pillar located on the other end side of the existing beam of 1 After the member installation step, a plurality of first studs extending above the lower end of the first metal bars are installed on the upper surface of the reinforcing member, and the upper ends of the second metal bars are installed on the lower surface of the reinforcing member. Stud installation step of installing a plurality of second studs extending further downward, and after the stud installation step, concrete is applied to a first region including the first metal reinforcement and defined by the upper surface of the reinforcing member. By placing the concrete in a second region that forms the first connecting beam, includes the second metal bar, and is defined by the lower surface of the reinforcing member. And a concrete placing step for forming a connecting beam.

  According to this seismic reinforcement method, after the reinforcing member is installed between the first metal bar and the second metal bar, the first stud and the second stud are installed on the reinforcing member. When the reinforcing member is installed, the interference between the first metal bar and the first stud and the interference between the second metal bar and the second stud are prevented. In addition, after the reinforcing member is installed, the first stud extending upward from the lower end of the first metal bar can be installed in the reinforcing member, and the first stud extending downward from the upper end of the second metal bar. Two studs can be installed on the reinforcing member. Therefore, by placing concrete in the first region, the first connecting beam can be formed in a state connected to the reinforcing member, and by placing concrete in the second region. The second connecting beam can be formed in a state of being connected to the reinforcing member. Therefore, according to the present seismic strengthening method, the first connecting beam and the reinforcing member are connected separately from the placing of the concrete for forming the first connecting beam and the second connecting beam. It is not necessary to fill the filler for connecting the connecting beam and the reinforcing member, and the time required for curing the filler is not required. Thereby, it can suppress that the construction period required for seismic reinforcement is prolonged.

  Further, according to the seismic reinforcement method, the first stud functions as an anchor bar for connecting the first connecting beam and the reinforcing member, and the second stud serves as the second connecting beam and the reinforcing member. It functions as an anchor line that connects and. Therefore, an anchor bar for connecting the first connecting beam and the reinforcing member and an anchor bar for connecting the second connecting beam and the reinforcing member are used separately from the first stud and the second stud. There is no need. The first metal bar functions as a spiral bar for preventing splitting of the concrete around the first stud in the concrete placed in the first region, and the second metal bar is the second metal bar. It functions as a spiral line for preventing splitting of the concrete around the second stud among the concrete cast in the area. Therefore, it is not necessary to use spiral bars separately from the first metal bars and the second metal bars. Thereby, the cost required for seismic reinforcement can be reduced.

(2) In the seismic reinforcement method, the reinforcing member has the upper surface, has an upper member connected to the first connection beam, and has the lower surface, and is connected to the second connection beam. A lower member, connected to the first existing column, connected to the one end side member connecting the upper member and the lower member, and connected to the second existing column, and connected to the upper member and the lower member It is good also as a structure which has the frame body containing the other end side member to perform, and the brace spanned between the said upper member and the said lower member in the state inclined with respect to the said up-down direction. According to this seismic reinforcement method, since the reinforcing member is constituted by the frame body and the brace, the first existing beam is compared with the case where the reinforcing member is constituted by the wall body or the like in which no opening is provided. And an opening between the second existing beam can be secured.

(3) In the seismic retrofit method, in the reinforcing member installation step, a part of the upper member is positioned above a lower end of the first metal bar, and a part of the lower member is the second. The reinforcing member may be installed so as to be positioned below the upper end of the metal bar. According to the seismic reinforcement method, a part of the upper member is located above the lower end of the first metal bar, and a part of the lower member is located below the upper end of the second metal bar. Since the reinforcing member is installed, the entire upper member is reinforced below the lower end of the first metal bar, or the entire lower member is positioned above the upper end of the second metal bar. Compared with the case where a member is installed, it can suppress that the opening between a 1st existing beam and a 2nd existing beam becomes narrow by an upper member and a lower member.

(4) In the seismic reinforcement method, the upper member has a plurality of first through holes, the lower member has a plurality of second through holes, and the first stud And the second stud is threaded. In the stud installation step, the first stud is inserted into the first through hole, and a nut is inserted into the thread of the first stud. The first stud is installed on the upper surface by screwing, the second stud is inserted into the second through hole, and a nut is screwed onto the screw thread of the second stud. The second stud may be installed on the lower surface. According to this seismic strengthening method, the first stud is installed on the upper member with a nut and the second stud is installed on the lower member with a nut. One stud and the second stud can be easily installed.

  The technology disclosed in the present specification can be realized in various forms, for example, in the form of a seismic reinforcement structure or the like.

The figure which shows the elevation structure of the existing building 10 The figure which shows the plane structure of the existing building 10 Explanatory drawing which shows the detailed structure of the earthquake-proof reinforcement structure 20 Explanatory drawing showing the anchor placement process Explanatory drawing showing the bar arrangement process Explanatory drawing showing the reinforcement member installation process Explanatory drawing showing the stud installation process

A. Embodiment:
A-1. Configuration of the seismic reinforcement structure 20:
FIG. 1 to FIG. 3 are explanatory views schematically showing the configuration of an existing building 10 that is seismically reinforced by the seismic reinforcement method according to the present embodiment. In the following description, the structure provided by the seismic reinforcement method is referred to as the seismic reinforcement structure 20. FIG. 1 shows a part of the elevation structure of the existing building 10, and FIG. 2 shows a part of the planar structure of the existing building 10 at the second floor level.

  The existing building 10 is a three-story building made of reinforced concrete, and includes a plurality of existing columns 11, a plurality of existing beams 12, and an outer wall 13. As shown in FIG. 2, in the present embodiment, a plurality of existing pillars 11 are arranged side by side in the X direction (horizontal direction) of the existing building 10, and the outer wall 13 is an interior of the plurality of existing pillars 11. It is provided along the side surface (hereinafter referred to as “inner surface”). Therefore, on the side surface in the X direction of the existing building 10, the outer surface of the existing column 11 protrudes to the outside of the existing building 10 rather than the outer surface of the outer wall 13. Therefore, when the reinforcing member 50 is provided on the side surface in the X direction in the existing building 10 and the seismic reinforcement is performed, it is not necessary to expand the cross section of the existing column 11 to the outside (so-called bulging), but It is necessary to extend (scaling) the outside to the outside. Hereinafter, this extended portion is referred to as “connection beam 30”.

  As shown in FIG. 1, in this embodiment, between the first existing pillar 11A and the second existing pillar 11B adjacent to the first existing pillar 11A on the first to third floors of the existing building 10. The reinforcing member 50 is installed in the span. Therefore, in this span, the cross section of the floor beam (existing beam 12) from the first floor to the roof is expanded. That is, the connecting beam 30 is provided on the outer surface of the existing beam 12 from the first floor to the storey.

  Below, it demonstrates paying attention to the reinforcement location of the 2nd floor among the earthquake-proof reinforcement structures 20. FIG. In the reinforcement part on the second floor, the floor beam (existing beam 12) on the third floor is referred to as a first existing beam 12A, and the floor beam (existing beam 12) on the second floor is referred to as a second existing beam 12B. In addition, the connecting beam 30 installed outside the first existing beam 12A is referred to as a first connecting beam 30A, and the connecting beam 30 installed on the outer surface of the second existing beam 12B is referred to as a second connecting beam 30B. .

  FIG. 3 is an explanatory diagram showing a detailed configuration of the seismic reinforcement structure 20. FIG. 3 (A) shows an enlarged view of the structure of the reinforcement part on the second floor of the seismic reinforcement structure 20, and FIG. 3 (B) shows a cross section taken along the line BB in FIG. 3 (A). The cross-sectional view is shown enlarged. The first connecting beam 30A and the second connecting beam 30B are reinforced concrete structures. The first connecting beam 30A is connected to the first existing beam 12A via an anchor bolt 33, and the second connecting beam 30B is connected to the second existing beam 12B via an anchor bolt 33. Yes.

  The reinforcing member 50 is located between the first connecting beam 30A and the second connecting beam 30B in the vertical direction and between the first existing column 11A and the second existing column 11B in the X direction. It is installed in the space 15. The reinforcing member 50 includes a steel frame 51 and a steel brace 56. The steel frame 51 is obtained by assembling a steel material having a cross-sectional shape in which a portion on one side with respect to a web in one flange of H-shaped steel is removed into a frame shape. The upper member 52 constituting the upper side of the steel frame 51 is formed on the first connecting beam 30A by the first stud 40A installed on the upper member 52 and the concrete 37 placed around the first stud 40A. It is connected. The lower member 53 constituting the lower side of the steel frame 51 is formed on the second connecting beam 30B by the second stud 40B installed on the lower member 53 and the concrete 37 placed around the second stud 40B. It is connected. Further, as will be described later, the left side member (one end side member) 54 constituting the left side of the steel frame body 51 is connected to the first existing column 11A, and the right side member (the right side member constituting the left side of the steel frame body 51). The other end member 55) is connected to the second existing pillar 11B.

  The steel brace 56 is formed by arranging an H-shaped steel in an X shape on a diagonal line of the steel frame 51. That is, the steel brace 56 is bridged between the upper member 52 and the lower member 53 in a state inclined with respect to the vertical direction. Although not shown in FIG. 3, the steel brace 56 and the steel frame 51 are connected by welding or bolts. The reinforcing member 50 improves the seismic performance because the steel brace 56 mainly handles the load in the horizontal direction.

A-2. Seismic reinforcement method:
4-7 is explanatory drawing which shows an earthquake-proof reinforcement construction method. 4-7, in order to show the seismic reinforcement method in an easy-to-understand manner, the illustration of the outer wall 13 of the existing building 10 is omitted, and a BB cross section in (A) is shown in (B). In the seismic reinforcement method of the present embodiment, a preparation process, an anchor placing process, a bar arrangement process, a reinforcing member installation process, a stud installation process, and a concrete placing process are performed in this order. Hereinafter, each step will be described.

(Preparation process)
In the seismic reinforcement method of this embodiment, a preparation process is first performed. In the preparation step, first, the exterior material of the outer surface of the first existing beam 12A and the outer surface of the second existing beam 12B is removed. Next, the surface of the portion where the exterior material of the outer surface of the first existing beam 12A and the outer surface of the second existing beam 12B is removed is roughened.

(Anchor placing process)
Next, an anchor placing process is performed. FIG. 4 is an explanatory view showing an anchor placing process. In the anchor placing step, a plurality of anchor bolts 33 are placed on the outer surface of the first existing beam 12A and the outer surface of the second existing beam 12B. Specifically, first, reinforcing bars (not shown) in the first existing beam 12A and the second existing beam 12B are searched, and the anchor bolts 33 are spaced at regular intervals so as to avoid the searched reinforcing bars. Hole 32 is formed. Next, the capsule containing the adhesive 31 is inserted into the hole 32, and then the anchor bolt 33 as an anchor member is inserted. By breaking the capsule by inserting the anchor bolt 33, the adhesive 31 in the capsule is filled between the hole 32 and the anchor bolt 33, and the anchor bolt 33 is installed.

  In the anchor placing step, a plurality of anchor bolts are provided on the side surface 16 of the first existing column 11A on the second existing column 11B side and the side surface 17 of the second existing column 11B on the first existing column 11A side. 63 is laid. The step of placing the anchor bolt 63 on the first existing column 11A and the second existing column 11B is the step of placing the anchor bolt 33 on the first existing beam 12A and the second existing beam 12B. The detailed description is omitted.

(Bar arrangement process)
Next, a bar arrangement process is performed. FIG. 5 is an explanatory diagram showing a bar arrangement process. In the bar arrangement process, the first reinforcing bar 34A constituting the first connecting beam 30A is disposed on the outer surface of the first existing beam 12A, and the second connecting beam 30B is disposed on the outer surface of the second existing beam 12B. The 2nd reinforcement bar 34B which constitutes is arranged. The bar arrangement process will be specifically described using the first reinforcing bar 34A as an example. First, a main reinforcing bar 35 that is a reinforcing bar arranged in parallel to the first existing beam 12A is provided. The main bar 35 is bridged between the hole 16A formed in the side surface 16 of the first existing column 11A and the hole 17A formed in the side surface 17 of the second existing column 11B. Next, a reinforcing bar 36 that is a reinforcing bar wound in a direction orthogonal to the main bar 35 is disposed. The same applies to the second reinforcing bar 34B.

  Further, in the bar arrangement process, the spiral bar 69 is arranged around the anchor bolt 63 driven in the first existing pillar 11A. In addition, spiral bars 69 are arranged around the anchor bolts 63 placed on the second existing pillar 11B.

(Reinforcing member installation process)
Next, a reinforcing member installation step is performed. FIG. 6 is an explanatory view showing a reinforcing member installation step. In the reinforcing member installation step, the reinforcing member 50 is installed in the space 15 between the first reinforcing bar 34A and the second reinforcing bar 34B in the vertical direction. Specifically, an anchor (not shown) for temporarily fixing the reinforcing member 50 in the space 15 is separately installed, and the steel frame 51 of the reinforcing member 50 is suspended from the anchor, whereby the reinforcing member 50 is attached. Install. In the reinforcing member installation step, if the steel brace 56 may be connected to the steel frame 51 after the steel frame 51 is installed in the space 15, the reinforcing member in a state where the steel brace 56 is connected to the steel frame 51. 50 may be installed in the space 15.

  Before the reinforcing member installation step is performed, studs 66 are installed on the left side member 54 and the right side member 55 of the steel frame 51. Therefore, when the reinforcing member 50 is installed in the space 15, the stud 66 installed on the left member 54 is disposed around the anchor bolt 63 placed on the first existing pillar 11 </ b> A, and is attached to the right member 55. The installed stud 66 is arranged around the anchor bolt 63 driven in the second existing pillar 11B.

  On the other hand, the first stud 40A (see FIG. 3B) is not installed on the upper member 52 of the steel frame 51, and the second stud 40B ( 3B) is not installed. Therefore, in this embodiment, when installing the reinforcing member 50, the first stud 40A and the second stud 40B do not interfere with the first reinforcing bar 34A and the second reinforcing bar 34B. Therefore, in this embodiment, the size of the steel frame 51 of the reinforcing member 50 can be increased. Specifically, when the reinforcing member 50 is installed, the upper end of the flange 52B protruding upward from the web 52A of the upper member 52 is positioned above the lower end of the first reinforcing bar 34A, and the lower member 53 The lower end of the flange 53B protruding downward from the web 53A is positioned below the upper end of the second reinforcing bar 34B.

(Stud installation process)
Next, a stud installation process is performed. FIG. 7 is an explanatory view showing a stud installation step. In the stud installation step, a plurality of first studs 40A are installed on the upper member 52 of the reinforcing member 50 installed in the space 15, and a plurality of second studs are installed on the lower member 53 of the reinforcing member 50 installed in the space 15. Install 40B.

  The case where the first stud 40A is installed on the upper member 52 will be specifically described as an example. In the vertical direction, the web 52A of the upper member 52 is positioned so as not to overlap the main bar 35 and the band bar 36 of the reinforcing bar 34A. First through holes 52C are formed at regular intervals. Further, one end of the first stud 40A (the lower end in FIG. 7B) is threaded. In the stud installation step, one end of the first stud 40A is inserted into the through-hole 52C, and the nut 42 that is screwed into the thread of the first stud 40A from above the web 52A of the upper member 52, and the first from below. The first stud 40 </ b> A is installed on the upper member 52 by tightening the nut 43 that is screwed into the thread of the stud 40 </ b> A against the web 52 </ b> A of the upper member 52. The same applies to the case where the stud 40B is screwed to the lower member 53.

  The first stud 40A has an upward protrusion length L3 from the web 52A of the upper member 52 longer than the distance L4 between the upper surface of the web 52A of the upper member 52 and the lower end of the first reinforcing bar 34A in the vertical direction. It installs in the upper member 52 so that it may become. Therefore, the other end of the first stud 40A (the upper end in FIG. 7B) extends upward from the lower end of the first reinforcing bar 34A.

  Further, the second stud 40B has a downward projection length L5 of the lower member 53 from the web 53A from the distance L6 between the lower surface of the web 53A of the lower member 53 and the upper end of the second reinforcing bar 34B in the vertical direction. Is also installed on the lower member 53 so as to be longer. Therefore, the other end of the second stud 40B (the lower end in FIG. 7B) extends below the upper end of the second reinforcing bar 34B.

(Concrete placing process)
Finally, a concrete placing process is performed. In the concrete placing step, a first frame R is placed around the first reinforcing bar 34A and a concrete 37 is placed in the first region R1 including the first reinforcing bar 34A. A connecting beam 30A is formed. Further, by placing a formwork (not shown) around the second reinforcing bar 34B and placing concrete 37 in the second region R2 including the second reinforcing bar 34B, the second connecting beam 30B is Form.

  When forming the first connecting beam 30A, the web 52A and the flange 52B of the upper member 52 of the reinforcing member 50 are used as part of the mold. That is, the web 52A and the flange 52B of the upper member 52 define a part of the first region R1 and abut against the concrete 37 placed in the first region R1. Accordingly, the first region R1 includes the first stud 40A. In the above configuration, the first stud 40A functions as an anchor bar for connecting the first connecting beam 30A and the upper member 52, and the first reinforcing bar 34A is driven in the first region R1. It functions as a spiral line for preventing splitting of the concrete 37 around the first stud 40A. Therefore, the first connecting beam 30A and the upper member 52 are connected by placing the concrete 37 in the first region R1.

  Further, when forming the second connecting beam 30B, the web 53A and the flange 53B of the lower member 53 of the reinforcing member 50 are used as a part of the mold. That is, the web 53A and the flange 53B of the lower member 53 define a part of the lower end of the second region R2 and abut against the concrete 37 placed in the second region R2. Accordingly, the second region R2 includes the second stud 40B. In the above configuration, the second stud 40B functions as an anchor bar for connecting the second connecting beam 30B and the lower member 53, and the second reinforcing bar 34B is driven in the second region R2. It functions as a spiral line for preventing splitting of the concrete 37 around the second stud 40B. Therefore, by placing the concrete 37 in the second region R2, the second connection beam 30B and the lower member 53 are connected. After the concrete 37 is placed in the first region R1 and the second region R2, after a predetermined strength is developed in the concrete 37, an anchor (not shown) for temporarily fixing the reinforcing member 50 is removed. .

  The anchor bolt 63 placed on the first existing pillar 11A, the stud 66 installed on the left side member 54, and the spiral muscle 69 are filled with a filler such as a non-shrink mortar, so that the first 1 existing pillar 11A and the left side member 54 are connected. In addition, by filling the anchor bolt 63 placed on the second existing pillar 11B, the stud 66 installed on the right member 55, and a filler such as a non-shrink mortar around the spiral muscle 69, the second The existing pillar 11B and the right member 55 are connected. Further, a filler such as a non-shrink mortar is filled between the upper member 52 and the first existing beam 12A and between the lower member 53 and the second existing beam 12B. Thereby, the earthquake-proof reinforcement structure 20 shown in FIG. 3 is comprised.

  As described above, in the seismic reinforcement method of the present embodiment, after the reinforcing member 50 is installed in the space 15 between the first reinforcing bar 34A and the second reinforcing bar 34B, the first stud 40A is the reinforcing member. The second stud 40 </ b> B is installed on the lower member 53 of the reinforcing member 50. Therefore, when the reinforcing member 50 is installed in the space 15, the first reinforcing bar 34A and the first stud 40A interfere with each other, and the second reinforcing bar 34B and the second stud 40B interfere with each other. Can be prevented.

  In addition, after the reinforcing member 50 is installed in the space 15, the first stud 40A extending above the lower end of the first reinforcing bar 34A can be installed on the upper member 52, and the upper end of the second reinforcing bar 34B. The second stud 40 </ b> B extending downward can be installed on the upper member 52. Therefore, the first connecting beam 30 </ b> A can be formed in a state of being connected to the upper member 52 by placing the concrete 37 in the first region R <b> 1. Similarly, the concrete 37 is placed in the second region R2, so that the second connection beam 30B can be formed in a state of being connected to the lower member 53. Accordingly, in order to connect the first connecting beam 30A and the upper member 52 separately from the placement of the concrete 37 for forming the first connecting beam 30A and the second connecting beam 30B as in the prior art. Alternatively, it is not necessary to fill the filler for connecting the second connecting beam 30B and the lower member 53, and time required for curing the filler is not necessary. Thereby, it can suppress that the construction period required for seismic reinforcement is prolonged.

  Further, in the seismic reinforcement method of the present embodiment, the first stud 40A functions as an anchor bar connecting the first connecting beam 30A and the upper member 52, and the second stud 40B is the second connecting beam. It functions as an anchor line that connects 30B and the lower member 53. Therefore, apart from the first stud 40A and the second stud 40B, the anchor bars that connect the first connecting beam 30A and the upper member 52, or the second connecting beam 30B and the lower member 53 are connected. Anchor muscle is not necessary. The first rebar 34A functions as a spiral rebar for preventing splitting of the concrete 37 around the first stud 40A out of the concrete 37 placed in the first region R1, and the second rebar 34B. However, it functions as a spiral line for preventing splitting of the concrete 37 around the second stud 40B among the concrete 37 placed in the second region R2. Therefore, it is not necessary to use spiral bars separately from the first reinforcing bars 34A and the second reinforcing bars 34B. Therefore, the cost required for the seismic reinforcement method can be reduced.

  In the seismic reinforcement method of the present embodiment, the reinforcing member 50 is constituted by the steel frame 51 and the steel brace 56. Therefore, compared with the case where the reinforcing member 50 is configured by a wall body or the like in which no opening is provided, it is between the first existing beam 12A and the second existing beam 12B and between the first existing column 11A and the first existing column. An opening between the two existing pillars 11B can be secured.

  Further, in the seismic reinforcement method of the present embodiment, the upper end of the flange 52B of the upper member 52 is located above the lower end of the first reinforcing bar 34A, and the lower end of the flange 53B of the lower member 53 is the second reinforcing bar 34B. It is located below the upper end of. Therefore, the entire upper member 52 including the flange 52B is positioned below the lower end of the first reinforcing bar 34A, or the entire lower member 53 including the flange 53B is positioned above the upper end of the second reinforcing bar 34B. Compared to the case, the upper member 52 or the lower member 53 can prevent the opening between the first existing beam 12A and the second existing beam 12B from becoming narrow.

  Further, in the seismic reinforcement method of the present embodiment, the first stud 40A is installed on the upper member 52 by the nuts 42 and 43, and similarly, the second stud 40B is installed on the lower member 53 by the nuts 42 and 43. Therefore, it is possible to easily install the first stud 40A and the second stud 40B as compared with the case of installing by other methods such as welding.

B. Variations:
The technology disclosed in the present specification is not limited to the above-described embodiment, and can be modified into various forms without departing from the gist thereof. For example, the following modifications are possible.

  In the above embodiment, the first stud 40A is installed on the upper member 52 by the nuts 42 and 43, and the second stud 40B is installed on the lower member 53 by the nuts 42 and 43. However, the present invention is not limited to this. . You may install by other methods, such as welding.

  In the above embodiment, the upper end of the flange 52B of the upper member 52 is positioned above the lower end of the first reinforcing bar 34A, and the lower end of the flange 53B of the lower member 53 is lower than the upper end of the second reinforcing bar 34B. Although it is supposed to be located, it is not limited to this. For example, the entire upper member 52 including the flange 52B may be positioned below the lower end of the first reinforcing bar 34A. Even in this case, the first connecting beam 30A is formed in a state of being connected to the reinforcing member 50 by placing the concrete 37 in the first region R1 defined by the web 52A of the upper member 52. Can do. Even if the entire upper member 52 including the flange 52B is located below the lower end of the first reinforcing bar 34A, the upper end of the first stud 40A extends to the upper side of the lower end of the first reinforcing bar 34A. Then, the first connecting beam 30A can be formed in a state of being firmly connected to the reinforcing member 50. The same applies to the case where the entire lower member 53 including the flange 53B is positioned above the upper end of the second reinforcing bar 34B.

  In the above embodiment, the reinforcing member 50 is configured by the steel frame body 51 and the steel brace 56, but is not limited thereto. You may be comprised by the wall body etc. in which the opening is not provided.

  In the said embodiment, although it is said that the reinforcement member 50 is comprised with the steel material which has the cross-sectional shape from which the one side part was removed with respect to the web in the one flange of H-shaped steel, it is not restricted to this. For example, the reinforcing member 50 may be made of H-shaped steel or the like. However, when the reinforcing member 50 is made of a steel material having the specific cross-sectional shape, it is easier to fill the surface of the reinforcing member 50 with the concrete 37 in the concrete placing process than when the reinforcing member 50 is made of H-shaped steel. . Further, the material constituting the reinforcing member 50 is not limited to the steel material, and may be a metal material other than steel.

  In the above-described embodiment, the first connecting beam 30A is configured by the first reinforcing bar 34A, and the second existing beam 12B is configured by the second connecting beam 30B. Metal bars may be used.

  In the above embodiment, the steel brace 56 is arranged in the X shape, but is not limited thereto. K-type, V-type, Mansard type, and other general shaped steel braces can be used.

  In the above embodiment, an example in which the cross section of the existing column 11 does not need to be extended to the outside side and the cross section of the existing beam 12 needs to be extended to the outside side has been described. The present invention is also applicable when it is necessary to expand the cross section of both the beam and the existing beam 12 to the outside. In this case, as the seismic reinforcement structure 20, the first connection beam 30A, the second connection beam 30B, and the reinforcing member 50 are installed, and the first connection column is installed outside the first existing column 11A. The second connection pillar is installed outside the second existing pillar 11B. And in the said embodiment, it is formed in the state in which the 1st connection pillar 30A was connected in the state connected with the upper member 52, and the 1st connection pillar was connected in the left side member 54. The second connecting column can be formed in a state where it is connected to the right member 55.

10: Existing building 11A: First existing column 11B: Second existing column 12A: First existing beam 12B: Second existing beam 15: Space 20: Seismic reinforcement structure 30A: First connecting beam 30B: Second connecting beam 33: Anchor bolt 34A: First reinforcing bar 34B: Second reinforcing bar 40A: First stud 40B: Second stud 50: Reinforcing member 51: Steel frame 52: Upper member 53: Lower member 54: Left side member 55: Right side member 56: Steel brace R1: First region R2: Second region

Claims (5)

A seismic retrofitting method for seismic reinforcement of existing buildings,
Anchor members are provided on the outer surface of the first existing beam facing the outside of the existing building and on the outer surface of the second existing beam positioned below the first existing beam. An anchor placing process for placing;
A first metal bar constituting a first connecting beam arranged on the surface of the first existing beam, and a second metal constituting a second connecting beam arranged on the surface of the second existing beam. A bar arrangement process for arranging two metal bars;
A first existing column and the first existing beam that are located between the first metal bar and the second metal bar in the vertical direction and are located on one end side of the first existing beam in the horizontal direction. A reinforcing member installation step of installing a reinforcing member between the second existing pillar located on the other end side of
After the reinforcing member installing step, a plurality of first studs extending above the lower end of the first metal bar are installed on the upper surface of the reinforcing member, and the second metal bar is installed on the lower surface of the reinforcing member. A stud installation step of installing a plurality of second studs extending below the upper end of the
After the stud installation step, the first connecting beam is formed by placing concrete in a first region including the first metal bar and defined by the upper surface of the reinforcing member, and the second connecting beam is formed. A concrete placing step of forming the second connecting beam by placing concrete in a second region including the metal reinforcing bars and defined by the lower surface of the reinforcing member;
A seismic reinforcement method. The seismic reinforcement method according to claim 1,
The reinforcing member is
An upper member having the upper surface and connected to the first connecting beam; a lower member having the lower surface and connected to the second connecting beam; and connected to the first existing pillar; A frame including one end side member connecting the upper member and the lower member, and the other end side member connected to the second existing pillar and connecting the upper member and the lower member;
A brace bridged between the upper member and the lower member in a state inclined with respect to the vertical direction;
A seismic reinforcement method. The seismic reinforcement method according to claim 2,
In the reinforcing member installation step, a part of the upper member is located above the lower end of the first metal bar, and a part of the lower member is lower than the upper end of the second metal bar. A seismic reinforcement method in which the reinforcing member is installed so as to be positioned. The earthquake-proof reinforcement method according to claim 2 or claim 3,
A plurality of first through holes are formed in the upper member,
A plurality of second through holes are formed in the lower member,
The first stud and the second stud are threaded;
In the stud installation step, the first stud is installed on the upper surface by inserting the first stud into the first through hole and screwing a nut into the thread of the first stud. A seismic reinforcement method for installing the second stud on the lower surface by inserting the second stud into the second through hole and screwing a nut into the screw thread of the second stud. A seismic reinforcement structure that seismically strengthens existing buildings,
A first connecting beam including a first metal bar and disposed on the outer surface of the first existing beam facing the outside of the existing building;
A second connecting beam including a second metal bar and disposed on the outer surface of the second existing beam positioned below the first existing beam;
The first existing column and the first existing column that are located between the first connecting beam and the second connecting beam in the vertical direction and that are positioned on one end side of the first existing beam in the horizontal direction A reinforcing member located between the second existing pillar located on the other end side of the beam;
With
The reinforcing member has a first stud installed on the upper surface of the reinforcing member, and a second stud installed on the lower surface of the reinforcing member,
The upper end of the reinforcing member is located above the lower end of the first metal bar,
The first stud extends above the lower end of the first metal bar,
The lower end of the reinforcing member is located below the upper end of the second metal bar,
The second stud is an earthquake-resistant reinforcing structure that extends below the upper end of the second metal bar.

Images