JP2016160607A - Structure and method for aseismic reinforcement of existing building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure and a method for aseismic reinforcement of an existing building that enhances aseismic performance without closing an opening.SOLUTION: An aseismic reinforcement structure for an existing building 11 includes a steel member 25 disposed along a plurality of beams 13 of the existing building 11, a reinforcing bar 26M disposed along a wing wall 14s of the existing building 11, the reinforcing bar being connected to the steel member 25, and a concrete body 27 containing the steel member 25 and the reinforcing bar 26 and disposed along the beam 13 and the wing wall 14s. A length of a first reinforcing part 22 is longer than a length of a second reinforcing part 23, the first reinforcing part comprising the steel member 25 and the concrete body 27 disposed along the beam 13, and the second reinforcing part comprising the reinforcing bar 26M and the concrete body 27 disposed along the wing wall 14s, in a thickness direction of a wall part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a seismic reinforcement structure for existing buildings and a seismic reinforcement method for existing buildings.

  Conventionally, as a seismic reinforcement method for existing buildings, by inserting a plurality of anchor bolts into pillars and beams of an existing building, fixing a long steel plate to the anchor bolts, and then placing concrete around the steel plate There is one that joins a rectangular frame-shaped steel sheet-containing concrete body to an existing building (for example, Patent Document 1).

JP-A-10-152997

  By the way, if a concrete body containing a steel sheet having a rectangular frame shape is joined to an existing building and a diagonal intervening reinforcing body (brace) is arranged on the diagonal of the rectangle, there is a problem that an opening such as a window is blocked.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the invention is to provide a seismic reinforcement structure for an existing building and a seismic reinforcement method for an existing building, which can improve seismic performance without blocking the opening.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
The seismic reinforcement structure for an existing building that solves the above-mentioned problem is a seismic reinforcement structure for an existing building that includes a plurality of beams and a wall portion in contact with the beams, and is connected to the steel materials arranged along the beams and the steel materials. A rebar disposed along the wall portion in a state of being formed, and a concrete body provided along the beam and the wall portion including the steel material and the rebar inside, the thickness of the wall portion In the vertical direction, the length of the first reinforcing portion constituted by the steel material and the concrete body arranged along the beam is constituted by the reinforcing bar and the concrete body arranged along the wall portion. It is more than the length of the 2nd reinforcement part.

  According to this structure, since the 1st reinforcement part contains the steel material excellent in intensity | strength and a deformation | transformation performance inside a concrete body, the earthquake resistance performance of the existing building can be improved significantly. In addition, since the 1st reinforcement part is arrange | positioned along a beam, even if the length in the thickness direction becomes long (thickness) by including steel materials, it is hard to become obstructive. Moreover, since the 2nd reinforcement part arrange | positioned along a wall part is the length (thickness) in a thickness direction below a 1st reinforcement part compared with a 1st reinforcement part, it continues from the opening part of an existing building. Protrusion into the living space can be suppressed. Then, by connecting the reinforcing bar included in the second reinforcing part and the steel material included in the first reinforcing part, the force generated in the axial direction of the reinforcing bar is efficiently transmitted between the steel material and the reinforcing bar, and the beam and the wall Breakage of the beam and the wall portion due to relative displacement of the portion can be suppressed. By arranging such a reinforcing structure along the beam and the wall, the seismic performance of the existing building can be enhanced without blocking the opening.

  The seismic reinforcement structure for an existing building includes a shaft member having a distal end portion inserted into the beam, and the steel member includes a shaft provided with a shaft member insertion hole through which a base end portion of the shaft member can be inserted, and the web. It is preferable that it is H-section steel which has a pair of flange extended from both ends.

  According to this configuration, the shaft material is inserted into the shaft material insertion hole provided in the web of the H-shaped steel, and the shaft material and the steel material are joined to each other, thereby generating the force generated in the direction intersecting the axial direction of the shaft material. Can be efficiently transmitted between the shaft and the shaft member. Moreover, the compression stress of a concrete body can be efficiently received with a flange by making steel materials into H-section steel.

  In the seismic reinforcement structure of the existing building, the steel material has a reinforcing bar insertion hole through which a reinforcing bar can be inserted, and the reinforcing bar connected to the steel material is a first reinforcing bar. It is preferable to include a second reinforcing bar that is inserted without being fixed.

  According to this configuration, since the first reinforcing bar is connected to the steel material, it is possible to resist the bending stress acting on the steel material by the tensile stress of the first reinforcing bar. On the other hand, the second rebar is not connected to the steel material, but only needs to be inserted through the rebar insertion hole, so that the labor of connecting the second rebar to the steel material can be saved.

In the seismic reinforcement structure for an existing building, it is preferable that the first reinforcement portion is longer in the horizontal direction than the second reinforcement portion.
According to this configuration, by extending the length of the first reinforcing portion provided above and below the second reinforcing portion, the beam of the existing building can be reinforced, and the resistance to rolls during an earthquake or the like can be improved.

  The seismic reinforcement method for an existing building that solves the above-mentioned problem is a seismic reinforcement method for an existing building that includes a plurality of beams and a wall portion that is in contact with the beams, and a steel material arrangement step of arranging a steel material along the beams, Reinforcing bars arranged along the wall, a connecting step connecting the steel and the reinforcing bar, and placing the steel and the reinforcing bar at positions along the beam and the wall so as to include the steel and the reinforcing bar. A concrete placing step, and a first reinforcing portion constituted by the steel material and the concrete arranged along the beam is constituted by the reinforcing bar and the concrete arranged along the wall portion. The length of the wall portion in the thickness direction is longer than that of the second reinforcing portion.

  According to this structure, the same effect as the said earthquake-proof reinforcement structure can be acquired.

  ADVANTAGE OF THE INVENTION According to this invention, the earthquake resistance performance of the existing building can be improved, without blocking an opening part.

The front view which shows typically one Embodiment of the earthquake-proof reinforcement structure of the existing building. Sectional drawing which shows the earthquake-proof reinforcement structure of the existing building. The front view which shows the structure of a reinforcement part typically. The perspective view which shows the installation position of a reinforcement part. Explanatory drawing which shows the balance of the stress in a 1st reinforcement part when a 2nd reinforcement part bears the shear stress. Explanatory drawing which shows the balance of the stress in a 1st reinforcement part when a 2nd reinforcement part bears bending stress. Sectional drawing which shows the 1st modification of a reinforcement part. The front view which shows the 2nd example of a change of a reinforcement part.

Hereinafter, as an example of an existing building, an embodiment of a seismic reinforcement structure for a reinforced concrete apartment house and a seismic reinforcement method for an existing building will be described with reference to the drawings.
As shown in FIG. 1, the existing building 11 includes a plurality of columns 12 arranged in the horizontal direction H, a plurality of beams 13 arranged in the vertical direction Z, a wall portion 14 in contact with the columns 12 and 13, and a wall portion 14. And a veranda 15 that forms a living space by being circumscribed and projecting. Of the beams 13, the beam at the bottom in the vertical direction Z is referred to as a foundation beam 13 </ b> B. The existing building 11 of the present embodiment is a five-story building including six (plural) beams 13 extending in the horizontal direction H along the vertical direction Z.

  The wall portion 14 is provided with a sweep window 16 serving as an entrance to the veranda 15 and a window 17 whose lower end position is higher than the floor surface. The sweep window 16 and the window 17 are an example of an opening provided in the wall portion 14 of the existing building 11, and the wall portion 14 of the existing building 11 has a door opening to which an opening / closing door is attached in addition to these windows. May be provided as an opening. The outer wall vertically above the sweep window 16 and the window 17 is the hanging wall 14b, the outer wall vertically below the window 17 is the waist wall 14w, and the two beams 13 (floor beam and ceiling beam) arranged in the vertical direction Z. The outer wall having no opening extending in the direction is called a sleeve wall 14s.

  The existing building 11 is provided with a reinforcing portion 21 (indicated by a two-dot chain line in FIG. 1) as an earthquake-proof reinforcing structure so as not to reach the opening of the existing building 11. The reinforcing portion 21 includes a first reinforcing portion 22 (a portion indicated by dark shading in FIG. 1) having a reinforced steel concrete structure disposed along the beam 13 and a second reinforced concrete structure disposed along the sleeve wall 14s. And a reinforcing portion 23 (a portion indicated by thin shading in FIG. 1). The 1st reinforcement part 22 and the 2nd reinforcement part 23 are joined to the existing building 11 so that it may protrude outward from the beam 13 and the sleeve wall 14s in the state integrated as the reinforcement part 21, respectively.

  The reinforcing portion 21 includes two first reinforcing portions 22 that are paired side by side in the vertical direction Z, and a second reinforcing portion 23 that is positioned between the first reinforcing portions 22 that are paired with each other. It is preferable to do. For example, if it is a reinforcement structure which reinforces the 1st floor part of the existing building 11, the 1st reinforcement part 22 provided along the floor beam (foundation beam 13B) of the 1st floor part, and the ceiling beam (2nd floor part) The first reinforcing portion 22 provided along the portion of the floor beam and the second reinforcing portion 23 provided along the sleeve wall 14s of the first floor portion constitute one unit. In addition to this, when the second floor portion is also reinforced, the second reinforcing portion 23 provided along the sleeve wall 14s of the second floor portion and the ceiling beam of the second floor portion (floor beam of the third floor portion) The 1st reinforcement part 22 provided along is added.

  As in the reinforcing portions 21 </ b> A to 21 </ b> D illustrated in FIG. 1, the reinforcing portion 21 includes the number of first reinforcing portions 22 arranged in the vertical direction Z, the number of second reinforcing portions 23 arranged in the horizontal direction H, or the first reinforcing portions. The extending length in the horizontal direction H of 22 and the second reinforcing portion 23 can be arbitrarily changed. The reinforcing portions 21 </ b> A to 21 </ b> D do not indicate a combination for reinforcing the existing building 11 but are expressed on the existing building 11 in order to show a modification example of the reinforcing portion 21. .

  In FIG. 1, the leftmost reinforcing portion 21 </ b> A includes three first reinforcing portions 22 arranged in the vertical direction Z, and two second reinforcements arranged between the first reinforcing portions 22 and arranged in the vertical direction Z. Unit 23. In the horizontal direction H, the lengths of the three first reinforcing portions 22 and the two second reinforcing portions 23 are equal.

  In FIG. 1, the reinforcing part 21 </ b> B located on the right side of the reinforcing part 21 </ b> A has a length in the horizontal direction H of the first reinforcing part 22 located on the lowermost side as compared with the reinforcing part 21 </ b> A. It is longer than the reinforcing part 22 and the two second reinforcing parts 23.

  In FIG. 1, the reinforcement part 21 </ b> D located on the rightmost side includes four first reinforcement parts 22 arranged in the vertical direction Z and three second reinforcement parts arranged between the first reinforcement parts 22 and arranged in the vertical direction Z. Unit 23. In the horizontal direction H, the length of the four first reinforcing portions 22 is longer than that of the three second reinforcing portions 23.

  In FIG. 1, the reinforcing part 21 </ b> C located on the left side of the reinforcing part 21 </ b> D includes four first reinforcing parts 22 arranged in the vertical direction Z, and a second arranged in the vertical direction Z between these first reinforcing parts 22. And a reinforcing portion 23. In the horizontal direction H, the four first reinforcing portions 22 extend in the horizontal direction H so as to straddle the plurality of sleeve walls 14s, the sweep window 16 and the window 17, and the second reinforcing portion 23 is the first reinforcing portion. The upper and lower ends are connected to 22 at a position where the sleeve wall 14s is located with a gap.

  As shown in FIG. 2, the reinforcing portion 21 includes a plurality of shaft members 24 whose tip portions are inserted into the beam 13, steel members 25 disposed along the beam 13, and reinforcing bars disposed along the sleeve wall 14 s. 26, and a concrete body 27 that includes the steel material 25 and the reinforcing bars 26 and is integrated with the existing building 11. That is, the first reinforcing portion 22 includes the steel material 25 and the concrete body 27 and is disposed along the beam 13, and the second reinforcing portion 23 includes the reinforcing bar 26 and the concrete body 27 along the sleeve wall 14 s. Has been placed. In addition, it is preferable to arrange a shear reinforcement bar 28 (a rib bar) around the steel material 25 to enhance the integrity of the steel material 25 and the concrete body 27.

  The steel material 25 is preferably an H-shaped steel having a web 25w and a pair of flanges 25f extending from both ends of the web 25w. In this case, in the steel material 25, the web 25w is provided with a plurality of shaft material insertion holes 35 through which the base end portion of the shaft material 24 can be inserted, and the flange 25f can have a plurality of rebars 26 extending in the vertical direction Z inserted therethrough. Reinforcing bar insertion hole 36 is provided. In FIG. 2, in order to illustrate the shaft member insertion hole 35 and the reinforcing bar insertion hole 36 at different positions in the direction orthogonal to the paper surface, the enlarged cross-sectional view surrounded by a two-dot difference line is not enlarged. Sections cut at different positions in the direction orthogonal to the portion and the paper surface are shown.

  The reinforcing bar 26 inserted through the reinforcing bar insertion hole 36 is disposed between the web 25w of the steel material 25 and the sleeve wall 14s in the thickness direction of the wall part 14 (left and right direction in FIG. 2), and is a concrete body of the second reinforcing part 23. 27 is arranged around the reinforcing bar 26. Since the first reinforcing portion 22 includes a steel material 25 having a cross-sectional area larger than that of the reinforcing bar 26 such as an H-shaped steel, the length of the first reinforcing portion 22 is the second reinforcing portion in the thickness direction of the wall portion 14. It is longer than the length of 23. For example, in the thickness direction, when the length (thickness) of the first reinforcing portion 22 is about 265 mm, the length (thickness) of the second reinforcing portion 23 is about 135 mm.

  The shaft member 24 is preferably an anchor bolt having a male screw portion corresponding to the female screw portion formed on the nut 31 at the base end portion. In this case, the steel 25 can be connected to the beam 13 via the shaft 24 by sandwiching the web 25w of the steel 25 inserted through the base end portion of the shaft 24 with the nut 31 attached to the shaft 24. .

  As shown in FIG. 3, it is preferable to attach a pair of nuts 31 so that the web 25w of the steel material 25 is sandwiched between the shaft materials 24 in the vicinity of both ends in the longitudinal direction of the steel material 25 among the plurality of shaft materials 24. However, in the other shaft member 24, the nut 31 may be attached only to the base end side or may not be attached so as to be retained. Also in this case, if concrete is cast so as to include the steel material 25, the steel material 25 can be connected to the shaft material 24 via the concrete body 27 that enters between the shaft material insertion hole 35 and the shaft material 24. In FIG. 3, the shear reinforcement bars 28 are not shown in order to clearly show the configuration of the reinforcing bars 26.

  The reinforcing bar 26 extends in a direction intersecting the horizontal direction H (for example, the vertical direction Z) and is inserted into the reinforcing bar insertion hole 36 of the steel material 25 and the first reinforcing bar 26M and the second reinforcing bar 26L in the horizontal direction H. A third reinforcing bar 26H that is extended.

  The first reinforcing bars 26M are, for example, threaded reinforcing bars joined by a mechanical joint 32, are arranged at both end portions in the horizontal direction H in the second reinforcing portion 23, and are connected to the steel material 25 by nuts 33 or the like. The second rebar 26L is a rebar having a smaller diameter than the first rebar 26M joined by, for example, a lap joint or the like, and is disposed between the first rebars 26M disposed at both end portions in the horizontal direction H. The The second rebar 26L does not necessarily have to be connected to the steel material 25, and may be inserted into the rebar insertion hole 36 of the steel material 25 without being fixed. Note that the number of the first reinforcing bars 26M and the second reinforcing bars 26L can be arbitrarily changed.

Next, the seismic reinforcement method for the existing building 11 will be described.
As shown in FIG. 2, the reinforcing portion 21 of the present embodiment is provided so as to penetrate the floor portion of the veranda 15 up and down. Therefore, when installing the reinforcing portion 21, first, the floor portion in contact with the sleeve wall 14 s of the veranda 15. Is removed to provide an installation opening 15h.

And the front-end | tip part of the shaft material 24 is inserted in the beam 13, and the shaft material 24 is installed so that the base end part of the shaft material 24 may protrude from the beam 13 (shaft material installation process).
Subsequently, the steel material 25 is suspended by a crane or the like, and the base end portions of the shaft material 24 are respectively inserted into the plurality of shaft material insertion holes 35 provided in the steel material 25 (insertion process).

  Further, by fixing the steel material 25 with a nut 31 or the like in a part or all of the shaft material 24, the steel material 25 is arranged along the beam 13 so that the flange 25f is horizontal. At this time, the steel material 25 is arranged at a position about 5 cm away from the beam 13 (steel material arranging step). And if necessary, a shear reinforcement bar 28 (band) is arranged around the steel material 25.

  Next, the reinforcing bars 26 are arranged along the sleeve walls 14s (rebar arranging step). First, the first rebar 26M is inserted into the rebar insertion holes 36 of the steel members 25 arranged in the vertical direction Z and fixed to all the steel members 25 with nuts 33 or the like, thereby connecting the steel members 25 and the rebars 26M ( Connecting step). Then, the 3rd reinforcing bar 26H extended in the horizontal direction H is arranged in the aspect joined to the 1st reinforcing bar 26M. Further, the second reinforcing bars 26L are inserted into the reinforcing bar insertion holes 36 of all the steel members 25 arranged in the vertical direction Z, and are fixed to the third reinforcing bars 26H extending in the horizontal direction H.

  When the reinforcing bars 26 are arranged, a formwork for placing concrete is attached to the outer surface side of the wall 14 so as to surround the steel material 25 and the reinforcing bars 26, and the concrete is poured into the formwork. Then, ordinary concrete is placed at a position in contact with the existing building 11 so as to include the steel material 25 and the reinforcing bars 26 (concrete placing step).

  Then, after the placed concrete is hardened to become the concrete body 27, the mold is removed. Thereby, the first reinforcing portion 22 is formed along the beam 13 and the second reinforcing portion 23 is formed along the sleeve wall 14s. Then, as needed, surface treatment of the concrete body 27, such as spraying of an exterior material, is performed and the reinforcement part 21 is completed.

Next, the effect | action of the seismic reinforcement structure of the existing building 11 in this embodiment and the seismic reinforcement method of the existing building is demonstrated.
As indicated by a two-dot chain line in FIG. 4, the reinforcing portion 21 is joined to the outer wall portion of the existing building 11 without closing the opening such as the sweep window 16. Furthermore, since the second reinforcing portion 23 provided along the wall portion 14 has a shorter outward projecting length than the first reinforcing portion 22, there is little feeling of pressure, and the living space that continues from the sweep window 16 in the existing building 11. The veranda 15 is not easily narrowed. That is, the 1st reinforcement part 22 containing the steel material 25 which is H-shaped steel protrudes outward rather than the 2nd reinforcement part 23 used as an increased striking wall, but the 1st reinforcement part 22 has low utilization as a living space. Since it is placed at a position (a position that extends horizontally from the floor or ceiling), it does not get in the way even if it protrudes.

  Further, since the reinforcing portion 21 does not protrude in a planar manner with respect to the structure provided in the existing building 11 such as the beam 13 or the sleeve wall 14s, even if it is attached to the outer wall of the existing building 11, the effect on the beauty is small. And since the reinforcement part 21 can be constructed from the outer side of the existing building 11, the operation | work inside a building is not required.

  It should be noted that when the additional wall is provided on the wall portion 14, when the non-shrink mortar is sprayed or troweled, it takes time for the work or the cost becomes high. In that respect, the reinforcing portion 21 of the present embodiment forms the concrete body 27 by placing ordinary concrete, so that the labor of the work is small and the cost is advantageous.

  In this embodiment, since the second reinforcing portion 23 is attached to the existing building 11 via the first reinforcing portion 22, the second reinforcing portion 23 is subjected to shear stress during an earthquake as shown in FIGS. Further, the deformation and destruction of the beam 13 and the wall portion 14 are suppressed by bearing the bending stress. 5 and 6, the configuration of the reinforcing portion 21 is simplified and expressed in order to clearly show the relationship between the forces acting on the structural elements.

  FIG. 5 shows a balance of stresses in the first reinforcing part 22 when the second reinforcing part 23 bears a shear stress. When the second reinforcing portion 23 bears the shear stress Fs, a compressive stress Fc is generated in the diagonal direction in the concrete body 27, and a tensile stress Ft is generated in the reinforcing bar 26L. In the first reinforcing portion 22, the compressive stress Fc of the concrete body 27 and the tensile stress Ft of the reinforcing bar 26 </ b> L are balanced with the shear stress Fs of the shaft member 24 through the steel material 25.

  FIG. 6 shows a balance of stress in the first reinforcing portion 22 when the second reinforcing portion 23 bears a bending stress. When the second reinforcing portion 23 bears a bending stress, a compressive stress Fc is generated in the vertical direction in the concrete body 27, and a tensile stress Ft is generated in the reinforcing bar 26M. In the first reinforcing portion 22, the vertical compressive stress Fc of the concrete body 27 and the tensile stress Ft of the reinforcing bar 26 </ b> M are balanced with the shear stress Fs of the shaft member 24 through the steel material 25.

  Thus, the steel material 25 is for transmitting the compressive stress Fc of the concrete body 27, the tensile stress Ft of the reinforcing bars 26L and 26M, and the shear stress Fs of the shaft member 24. In addition, the shaft member 24 is inserted into the shaft member insertion hole 35 provided in the web 25w of the H-shaped steel as the steel member 25 to join the shaft member 24 and the steel member 25, thereby crossing the axial direction of the shaft member 24. The force generated in the direction can be efficiently transmitted between the steel material 25 and the shaft material 24. Further, the reinforcing bars 26L, 26M are inserted into the reinforcing bar insertion holes 36 provided in the flange 25f of the H-shaped steel as the steel material 25, and the reinforcing bars 26L, 26M are joined to the steel material 25, thereby the axial direction of the reinforcing bars 26L, 26M. The generated force can be efficiently transmitted between the steel material 25 and the reinforcing bars 26L and 26M. And the compression stress Fc of the concrete body 27 can be efficiently received by the flange 25f by making the steel material 25 into H-shaped steel.

  The reinforcing portion 21 does not include a steel material extending in the vertical direction Z, and the second reinforcing portion 23 is thinner than the first reinforcing portion 22, but the second reinforcing portion 23 has a large installation area with respect to the wall portion 14. Can demonstrate high earthquake resistance.

  For example, when the reinforcing portion 21 is provided in the first floor portion, the strength of the second reinforcing portion 23 is increased by reinforcing the beam 13 that becomes the ceiling beam on the first floor (the floor beam on the second floor) with the first reinforcing portion 22. You can make use of it.

  In addition, if the length of the 1st reinforcement part 22 is made longer than the 2nd reinforcement part 23 in the horizontal direction H like reinforcement part 21B, 21C, 21D shown in FIG. Since the effect of reinforcing the strength is enhanced and the resistance to rolls during an earthquake or the like can be improved, it is possible to ensure the earthquake resistance of the reinforcing portion 21 as a whole.

  Further, when the reinforcing portion 21 is installed, the shaft member 24 (post-installed anchor) is not installed on the sleeve wall 14s, so that the generation of noise and vibration generated when the hole into which the shaft member 24 is inserted is reduced. .

According to the embodiment detailed above, the following effects are exhibited.
(1) Since the 1st reinforcement part 22 contains the steel material 25 excellent in intensity | strength and a deformation | transformation performance inside the concrete body 27, the earthquake resistance performance of the existing building 11 can be improved greatly. In addition, since the 1st reinforcement part 22 is arrange | positioned along the beam 13, even if the length in the thickness direction becomes long (thick) by including the steel material 25, it is hard to get in the way. In addition, the second reinforcing portion 23 arranged along the wall portion 14 has a length (thickness) in the thickness direction equal to or less than that of the first reinforcing portion 22 as compared with the first reinforcing portion 22. Protrusion to the living space that continues from the opening of the can be suppressed. Then, by connecting the reinforcing bar 26M included in the second reinforcing part 23 and the steel material 25 included in the first reinforcing part 22, the force generated in the axial direction of the reinforcing bar 26M is efficiently generated between the steel material 25 and the reinforcing bar 26M. It can transmit and the destruction of the beam 13 and the wall part 14 by the relative displacement of the beam 13 and the wall part 14 can be suppressed. By disposing such a reinforcing structural body along the beam 13 and the wall portion 14, the seismic performance of the existing building 11 can be enhanced without blocking the opening.

  (2) Crossing the axial direction of the shaft member 24 by inserting the shaft member 24 into the shaft member insertion hole 35 provided in the web 25w of the H-shaped steel as the steel member 25 and joining the shaft member 24 and the steel member 25. The force generated in the direction to be transmitted can be efficiently transmitted between the steel material 25 and the shaft material 24. Moreover, the compression stress of the concrete body 27 can be efficiently received by the flange 25f by making the steel material 25 into H-shaped steel.

  (3) The reinforcing bars 26L and 26M are inserted into the reinforcing bar insertion holes 36 provided in the flange 25f of the H-shaped steel as the steel material 25, and the reinforcing bars 26L and 26M are joined to the steel material 25, whereby the reinforcing bars 26L and 26M are axially disposed. Can be efficiently transmitted between the steel material 25 and the reinforcing bars 26L, 26M.

  (4) Since the first reinforcing bar 26M is connected to the steel material 25, it can resist the bending stress acting on the steel material 25 with the tensile stress of the first reinforcing bar 26M. On the other hand, the second rebar 26L is not connected to the intermediate steel material 25, but only needs to be inserted through the rebar insertion hole 36, so that the trouble of connecting the second rebar 26L to the steel material 25 can be saved.

  (5) By extending the length of the first reinforcing portion 22 provided above and below the second reinforcing portion 23, the beam 13 of the existing building 11 is reinforced, and the resistance to rolls during an earthquake or the like can be improved. .

(Example of change)
In addition, the said embodiment can also be changed and actualized as follows. Moreover, the said embodiment and the following modified example can be embodied combining arbitrarily.

  -The steel material 25 built in the reinforcement part 21 is not restricted to H-section steel, For example, it can change arbitrarily, such as a steel plate, I-shape steel, L-shape steel, a groove-shaped steel, and a mountain-shaped steel. However, the use of H-shaped steel having a pair of parallel flanges 25f as the steel material 25 is more preferable because the compressive stress of the concrete body 27 can be efficiently received from the vertical direction.

The second reinforcing portion 23 can be provided not only on the sleeve wall 14s but also on the hanging wall 14b and the waist wall 14w above and below the window (opening).
As shown in the first modification shown in FIG. 7, for example, there is no veranda 15 that forms a living space by circumscribing the wall portion 14 to which the reinforcing portion 21 is attached, and there is no balcony, corridor, etc. Is allowed, the length (thickness) of the first reinforcing portion 22 and the second reinforcing portion 23 may be equal in the thickness direction of the wall portion 14. In this case, the reinforcing effect by the reinforcing portion 21 can be further enhanced by arranging the reinforcing bars 26 on both sides of the web 25 w of the steel material 25.

  As in the second modification shown in FIG. 8, in the reinforcing portion 21, in addition to the reinforcing bars 26M, 26L, and 26H, or in place of the reinforcing bars 26M, 26L, and 26H, intersect with both the horizontal direction H and the vertical direction Z. The oblique reinforcing bars 26S may be arranged, or the oblique reinforcing bars 26S may be arranged so as to cross each other to form an X shape.

  The shaft member 24 is not necessarily inserted through the steel member 25 by providing the shaft member insertion hole 35. For example, if concrete is placed so as to include a base end portion projecting from the existing building 11 of the shaft member 24 with the tip portion inserted into the beam 13 and the steel material 25, the shaft member 24 is passed through the solidified concrete body 27. And the steel material 25 can transmit a force. According to this configuration, even if the position of the shaft member 24 is shifted when the shaft member 24 is inserted into the beam 13, it is possible to avoid the operational difficulty of inserting the shaft member 24 into the shaft member insertion hole 35. . However, if the shaft member 24 is inserted into the shaft member insertion hole 35, the force acting in the direction intersecting the axial direction of the shaft member 24 is more reliably transmitted between the shaft member 24 and the steel member 25. This is preferable.

  H ... Horizontal direction, Z ... Vertical direction, 11 ... Existing building, 13 ... Beam, 14s ... Sleeve wall which is a wall part, 22 ... First reinforcement part, 23 ... Second reinforcement part, 24 ... Shaft material, 25 ... Steel material 25f ... flange, 25w ... web, 26, 26H, 26L, 26M, 26S ... rebar, 26L ... second rebar, 26M ... first rebar, 27 ... concrete body, 35 ... shaft material insertion hole, 36 ... rebar Insertion hole.

Claims (5)

An earthquake-proof reinforcement structure for an existing building comprising a plurality of beams and a wall portion in contact with the beams,
Steel material arranged along the beam;
Reinforcing bars arranged along the wall in a state of being connected to the steel material;
A concrete body provided along the beam and the wall portion including the steel material and the reinforcing bar inside;
With
In the thickness direction of the wall part, the length of the first reinforcing part constituted by the steel material and the concrete body arranged along the beam is the reinforcing bar and the concrete arranged along the wall part. A seismic reinforcement structure for an existing building, characterized in that it is longer than the length of the second reinforcement part constituted by the body. A shaft member having a tip inserted into the beam,
2. The steel material according to claim 1, wherein the steel material is an H-shaped steel having a web provided with a shaft material insertion hole through which a base end portion of the shaft material can be inserted and a pair of flanges extending from both ends of the web. Seismic reinforcement structure for existing buildings as described. The steel material has a reinforcing bar insertion hole through which a reinforcing bar can be inserted,
2. The second reinforcing bar inserted without being fixed to the reinforcing bar insertion hole of the steel material when the reinforcing bar connected to the steel material is a first reinforcing bar. Item 3. An earthquake-proof reinforcement structure for an existing building according to item 2. The seismic reinforcement structure for an existing building according to any one of claims 1 to 3, wherein the first reinforcement portion is longer in the horizontal direction than the second reinforcement portion. A method for seismic reinforcement of an existing building comprising a plurality of beams and a wall portion in contact with the beams,
A steel material arranging step of arranging a steel material along the beam;
A reinforcing bar arrangement step of arranging reinforcing bars along the wall,
A connecting step of connecting the steel material and the reinforcing bar;
A concrete placing step of placing concrete so as to include the steel material and the reinforcing bar at a position along the beam and the wall; and
With
In the thickness direction of the wall portion, the length of the first reinforcing portion constituted by the steel material and the concrete arranged along the beam is determined by the reinforcing bar and the concrete arranged along the wall portion. A seismic reinforcement method for an existing building, characterized in that the length is equal to or longer than the length of the second reinforcing part to be configured.