JP2019073942A - Seismic reinforcing structure for existing building - Google Patents

Abstract

To provide a seismic reinforcing structure of an existing building capable of suppressing the destruction of a connecting portion to the existing building.SOLUTION: An seismic reinforcing structure 16 reinforces an existing building 11 having a first existing column 12s, a second existing column 12t adjacent to the first existing column 12s, and an existing beam 13 extending from the first existing column 12s to the second existing column 12t. The seismic reinforcing structure 16 has a reinforcing wall 20 joined to the first existing column 12s, having a first connecting portion 27 connected to the intersection of the first existing column 12s and the existing beam 13, a second connecting portion 37 connected to the intersection of the second existing column 12t and the existing beam 13, and a reinforcing beam 30 extending along the existing beam 13 from the first connecting portion 27. The reinforcing beam 30 has a hinge structure 38 and is connected to the second connecting portion 37.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a seismic reinforcement structure of an existing building.

  There is a seismic reinforcement structure of the existing building which fixes a steel plate to a pillar and beam of an existing building with a shaft, covers the steel plate and the shaft with concrete, and forms a frame (for example, patent documents 1).

Japanese Patent Application Laid-Open No. 10-152997

  When a frame is connected to an existing building via a shaft, the connecting part may be destroyed at the time of an earthquake, so that the seismic performance may not be sufficiently exhibited. An object of this invention is to provide the aseismatic reinforcing structure of the existing building which can suppress the failure | damage of the connection part with respect to an existing building.

  The seismic reinforcement structure of the existing building which solves the above-mentioned subject includes a first existing column, a second existing column juxtaposed to the first existing column, and an existing beam extending from the first existing column to the second existing column And a first connecting portion connected to an intersection between the first existing column and the existing beam, and the joint is connected to the first existing column. The reinforcement wall, the second connecting portion connected to the intersection of the second existing column and the existing beam, and the reinforcing beam extending from the first connecting portion along the existing beam; The reinforcing beam has a hinge structure and is connected to the second connection part.

  ADVANTAGE OF THE INVENTION According to this invention, destruction of the connection part with respect to the existing building of a seismic strengthening structure can be suppressed.

The front view which shows typically the existing building in which the aseismatic reinforcement structure was arrange | positioned. The whole block diagram which shows one Embodiment of a seismic strengthening structure. 3-3 arrow sectional drawing in FIG. 4-4 arrow sectional drawing in FIG. 5-5 arrow sectional drawing in FIG. The whole block diagram which shows the 1st example of a change of a seismic strengthening structure. The block diagram which shows the 2nd example of a change of a seismic resistant reinforcement structure. 8-8 arrow sectional drawing in FIG. The block diagram which shows the 3rd example of a change of a seismic resistant reinforcement structure. The block diagram which shows the 4th example of a change of a seismic strengthening structure.

Hereinafter, the aseismatic reinforcing structure disposed in a reinforced concrete apartment house, which is an example of an existing building, will be described with reference to the drawings.
As shown in FIG. 1, the existing building 11 includes a plurality of existing columns 12, a plurality of existing beams 13, and an outer wall 14 in contact with the existing columns 12 and the existing beams 13. The existing beam 13 at the lowermost portion is a foundation beam 13 b.

  The outer wall 14 has a plurality of openings 15, for example windows. The outer wall 14 which is the outer wall 14 adjacent to the existing column 12 and has no opening 15 between the floor beam which is the two existing beams 13 arranged vertically and vertically and the ceiling beam is called a sleeve wall 14s. The outer wall 14 between the opening 15 and the existing beam 13 (floor beam) located below the opening 15 is called a waist wall 14w, and the opening 15 and the existing beam 13 (ceiling beam) located above the aperture 15 The outer wall 14 between them is referred to as a hanging wall 14t.

  When one of the existing columns 12 is a first existing column 12s, the existing column 12 adjacent to the first existing column 12s is a second existing column 12t. The existing beam 13 extends from the first existing column 12s to the second existing column 12t. In the present embodiment, the first existing column 12s contacts the sleeve wall 14s. The sleeve wall 14s and the first existing column 12s are collectively referred to as a sleeved column 17. That is, the first existing column 12s constitutes a sleeved column 17 together with the sleeve wall 14s.

  In the existing building 11, a structure 16 (shown by hatching in FIG. 1) which is a seismic reinforcement structure is disposed. The several structures 16 shown in FIG. 1 do not show the combination of the structure 16 which reinforces the existing building 11 of one building, but show the example of a change of the shape of the structure 16 in multiple numbers.

  The structure 16 includes a reinforcing wall 20 joined to at least the first existing column 12s, and a reinforcing beam 30 disposed along the existing beam 13. In the case where the first existing column 12 s constitutes the sleeved column 17, the reinforcing wall 20 is preferably joined to the sleeved column 17. The reinforcing beam 30 is preferably provided so as to cover the waist wall 14 w and the hanging wall 14 t in addition to the existing beam 13.

  As shown in FIG. 2, the reinforcing wall 20 has a first connecting portion 27 connected to the intersection of the first existing column 12 s and the existing beam 13. The first connecting portion 27 includes a plurality of first shaft members 21 driven into the intersection of the first existing column 12s and the existing beam 13, and a first steel member 22 fixed to the plurality of first shaft members 21. Have. The first shaft member 21 is preferably disposed on the first existing column 12s in the intersection of the first existing column 12s and the existing beam 13. Further, from the inside of the intersection, the first shaft member 21 is extended on the first existing column 12s or the existing beam 13 You may extend the laying range on the extension of the The first steel material 22 may be a steel plate or a shaped steel such as an H-shaped steel.

  The reinforcing wall 20 is a reinforced concrete structure having a plurality of reinforcing bars 23 and a concrete body 24 covering the first steel material 22 and the reinforcing bars 23, and by including the first steel material 22, it becomes a reinforcing steel reinforced concrete structure. The reinforcing bars 23 may be arranged along the sleeved column 17 so as to be aligned vertically and horizontally or diagonally. The reinforcing wall 20 is joined by a concrete body 24 to a post 17 with a sleeve.

  The structure 16 includes a second connecting portion 37 connected to an intersection of the second existing column 12t and the existing beam 13, and a hinge structure 38 disposed between the first connecting portion 27 and the second connecting portion 37. And. The hinge structure 38 is preferably close to the second connection portion 37. The reinforcing beam 30 of the present embodiment has a hinge structure 38 and extends from the first connection portion 27 along the existing beam 13, and the tip thereof is connected to the second connection portion 37 via the hinge structure 38.

  The second connection portion 37 includes a plurality of second shaft members 31 driven into the intersection of the second existing column 12t and the existing beam 13, and a second steel member 32 fixed to the plurality of second shaft members 31. Have. The second shaft member 31 is preferably disposed on the second existing column 12t in the intersection of the second existing column 12t and the existing beam 13. Further, from the inside of the intersection, the second axial member 31 is extended on the second existing column 12t or the existing beam 13 You may extend the laying range on the extension of the The second steel material 32 may be a steel plate or a shaped steel such as an H-shaped steel.

  The reinforcing beam 30 is a reinforced concrete structure having a plurality of reinforcing bars 33 and a concrete body 34 covering the reinforcing bars 33. The second connection portion 37 is a steel reinforced concrete structure having a plurality of reinforcing bars 33 and a concrete body 34 covering the reinforcing bars 33 and the second steel material 32.

  The reinforcing beam 30 and the second connection portion 37 may be an integrally formed steel frame reinforced concrete structure. In this case, the steel frame reinforced concrete structure integrally formed is provided with a slit 34s extending along the boundary between the reinforcing beam 30 and the second connecting portion 37, and intersects the boundary between the reinforcing beam 30 and the second connecting portion 37. A reinforcement 36 may be arranged. The reinforcing member 36 has its proximal end held by the reinforcing beam 30 and its distal end held by the second connection portion 37.

  The slit 34 s and the reinforcing member 36 constitute a hinge structure 38. The hinge structure 38 is a structure that transmits a shear stress between the reinforcing beam 30 and the second connection portion 37 and reduces a bending stress transmission performance between the reinforcing beam 30 and the second connection portion 37.

  It is preferable to provide a first connecting portion 27 at the upper end and the lower end of the reinforcing wall 20. The lower end of the reinforcing wall 20 is preferably connected to the base beam 13b. In this case, preferably, the reinforcing beam 30 extends at least along the base beam 13 b from the lower end of the reinforcing wall 20.

  As shown in FIG. 3, the reinforcing wall 20 may have a shaft 21 s driven into the sleeve wall 14 s. The shaft 21s may be shorter than the first shaft 21 so as not to penetrate the sleeve wall 14s. The reinforcing beam 30 may project outward beyond the reinforcing wall 20. Alternatively, the reinforcing wall 20 may project outward beyond the reinforcing beam 30.

  As shown in FIG.2 and FIG.4, it is preferable to insulate the existing beam 13 and the reinforcement beam 30 so that shear stress may not be transmitted between both. For example, when the insulating sheet 35 is laid between the existing beam 13 and the concrete body 34 constituting the reinforcing beam 30, the existing beam 13 and the reinforcing beam 30 are insulated. The sheet 35 is, for example, a polyethylene film. The range in which the sheet 35 is laid, including FIG. 2, is illustrated by hatching.

  As shown in FIG. 5, it is preferable that a plurality of reinforcing members 36 constituting the hinge structure 38 be embedded in the portion of the concrete body 34 without the slits 34s. The reinforcing material 36 is, for example, a dowel muscle. Preferably, the slits 34s are provided equally above and below the concrete body 34 holding the reinforcing member 36.

According to the embodiment described above, the following effects are exhibited.
(1) The reinforcing beam 30 extending from the first connection portion 27 has the hinge structure 38 and is connected to the second connection portion 37. Therefore, when the seismic force acts on the existing building 11, the second connection portion 37 The bending stress generated in the reinforcing beam 30 is reduced in the vicinity of As a result, the shear force acting on the second connection portion 37 is reduced, and the breakage of the second connection portion 37 can be suppressed.

(2) Since stress is not transmitted to the reinforcing beam 30 from the insulated existing beam 13 and the shear stress acting on the second connection portion 37 becomes clear, the design of the second connection portion 37 becomes easy.
(3) The transmission performance of bending stress between the reinforcing beam 30 and the second connection portion 37 can be reduced by the slit 34s. In addition, shear stress can be transmitted between the reinforcing beam 30 and the second connection portion 37 by the reinforcing member 36.

  (4) By fixing the shaft members 21 and 31 to the steel materials 22 and 32, respectively, it is possible to prevent the extraction failure of the shaft members 21 and 31 caused by the shear displacement deformation of the connection portions 27 and 37. As a result, even if shear displacement occurs in the connection portions 27 and 37, it is possible to prevent the shear transfer performance from being sharply reduced.

(5) The load resistance of the reinforcing wall 20 can be increased by extending the laying range of the reinforcing wall 20 to the sleeve wall 14s.
The above embodiment may be modified as shown below. The configurations included in the above-described embodiment can be arbitrarily combined with the configurations included in the following modifications. The configurations included in the following modifications can be arbitrarily combined.

  -As a 1st modification shown in FIG. 6, the reinforcement wall 20 may be provided with the 1st steel material 22 of the magnitude | size which covers the whole of the sleeved column 17. As shown in FIG. In this case, the plurality of first connecting portions 27 share one first steel member 22. For example, in the case where the lateral width of the sleeve wall 14s is short and the area of the reinforcing wall 20 is small, it is preferable to increase the laying area of the first steel member 22 to enhance the resistance of the reinforcing wall 20.

  The first steel material 22 may be extended to the tip of the existing beam 13 as in the second modification shown in FIG. 7. For example, in the case where a discharge window serving as the opening 15 is installed and the beam height is reduced, it is preferable to dispose the first steel material 22 on the entire existing beam 13 to increase the strength of the existing beam 13. In this case, the end portions of the two first steel members 22 may be connected by a fixing tool 39 such as a bolt.

  As in the second modification shown in FIG. 7, the reinforcing member 36 may be a steel plate. In this case, the reinforcing material 36 may be formed integrally with the second steel material 32. According to this configuration, the trouble of installing the reinforcing member 36 can be saved. In this case, the shock absorbing material 70 may be disposed at the tip of the reinforcing material 36 extended from the second steel material 32. As a material of the shock absorbing material 70, for example, a foamed plastic can be used. When the shock absorbing material 70 is disposed, the collision between the reinforcing material 36 and the first steel material 22 can be prevented when the slit 34 s portion is bent due to the seismic force.

  -As shown in FIG.7 and FIG.8, when the reinforcing material 36 is a steel plate, the slit 34s is provided in the aspect which divides the concrete body 34 completely, and the 2nd connection part 37 connected with the 2nd existing pillar 12t. And the reinforcing beam 30 may be connected only by the reinforcing member 36.

A pin structure may be adopted as one type of hinge structure 38.
For example, as shown in the third modification of FIG. 9, a single shaft member is employed as the reinforcing member 36, and a spherical or cylindrical pin 71 is attached to the tip of the shaft member, and the pin 71 can be rotated. The second connecting portion 37 may be provided with a bearing 72 for pivotally supporting it.

  -As shown in the 3rd modification of Drawing 9, the 1st existing pillar 12s does not need to constitute pillar 17 with a sleeve wall. In this case, the reinforcing wall 20 is disposed along the first existing column 12s. When the first existing column 12s does not constitute the sleeved column 17, the reinforcing wall 20 may be provided so as to cover a part or all of the opening 15.

  -As shown in the 3rd modification of Drawing 9, the 2nd existing pillar 12t may constitute pillar 17 with a sleeve wall. In this case, the second connecting portion 37 may be extended to the entire width of the sleeved column 17 and the slit 34s may be disposed at a position away from the second existing column 12t.

  As shown in the fourth modification of FIG. 10, the hinge structure 38 may be provided in the middle of the reinforcing beam 30. When the hinge structure 38 is separated from the second connection portion 37, the shear stress acting on the second connection portion 37 becomes large, so more second shaft members 31 are required. On the other hand, since the rigidity of the structure 16 is high, the seismic reinforcement performance is exhibited with a slight deformation due to an earthquake. Also, the hinge structure 38 may be a pin structure having a pin 71. In this case, for example, the pin 71 can be supported by a support member composed of a single clevis 73 and a double clevis 74.

  As shown in FIG. 1, the structure 16 may extend from the lower floor to the upper floor so as to straddle a plurality of floors. In this case, the reinforcing beam 30 may be extended along the existing beam 13 from the first connecting portion 27 located at the upper end of the reinforcing wall 20 or only from the first connecting portion 27 located at the lower end of the reinforcing wall 20 The existing beam 13 may be extended. The reinforcing beam 30 may be extended from the first connecting portion 27 of the reinforcing wall 20 toward the second existing pillars 12t on both sides, or may be extended only to one second existing pillar 12t. May be

  The reinforcing beam 30 may be provided to cover the waist wall 14 w and the hanging wall 14 t. When the reinforcing wall 20 is extended to the waist wall 14w or the hanging wall 14t, in both the first existing column 12s and the reinforcing wall 20, bending yield is likely to occur at a height of the waist wall 14w or a cross section near the hanging wall 14t. Therefore, relative displacement of the deformation behavior of the first existing column 12s and the reinforcing wall 20 with respect to the seismic force is reduced, and it is possible to suppress the failure of the joint portion between the first existing column 12s and the reinforcing wall 20.

Below, the technical idea grasped from the above-mentioned embodiment and its operation effect are described.
[Thought 1]
A seismic reinforcement structure for reinforcing an existing building having a first existing column, a second existing column arranged next to the first existing column, and an existing beam extending from the first existing column to the second existing column There,
A reinforcing wall joined to the first existing column, having a first connecting portion connected to an intersection of the first existing column and the existing beam;
A second connecting portion connected to an intersection of the second existing column and the existing beam;
A reinforcing beam extending from the first connection portion along the existing beam;
Equipped with
The said reinforcement beam has a hinge structure and is connected with a said 2nd connection part. The earthquake-resistant reinforcement structure of the existing building characterized by the above-mentioned.

  According to this configuration, since the reinforcing beam extending from the first connection portion has the hinge structure and is connected to the second connection portion, when the seismic force acts on the existing building, the reinforcement beam is connected to the vicinity of the second connection portion. The bending stress generated in the reinforcing beam is reduced. As a result, the shear force acting on the second connection portion is reduced, and the breakage of the second connection portion can be suppressed.

[Thought 2]
The said reinforcement beam is insulated with the said existing beam. The aseismic reinforcing structure of the existing building as described in [the thought 1].

According to this configuration, the stress is not transmitted from the insulated existing beam to the reinforcing beam, and the shear stress acting on the second connection portion becomes clear, so the design of the second connection portion becomes easy.
[Thought 3]
A steel reinforced concrete structure having a slit extending along the boundary between the reinforcing beam and the second connection portion, and integrally forming the reinforcing beam and the second connection portion;
A reinforcing member in which a base end is held by the reinforcing beam and a tip end is held by the second connection portion, and the bridging portion is bridged;
Equipped with
The said slit and the said reinforcement material comprise the said hinge structure. The aseismic reinforcing structure of the existing building as described in [the thought 1] or [the thought 2].

  According to this configuration, the transfer performance of bending stress between the reinforcing beam and the second connection portion can be reduced by the slit. Also, shear stress can be transmitted between the reinforcing beam and the second connection portion by the reinforcing material.

[Thought 4]
The first connection portion includes a plurality of first shaft members driven into intersections of the first existing column and the existing beam;
And a first steel member fixed to the plurality of first shaft members,
The second connection portion includes a plurality of second shaft members driven into an intersection of the second existing column and the existing beam, and a second steel member fixed to the plurality of second shaft members. The anti-seismic reinforcing structure of the existing building according to any one of [Thought 1] to [Thought 3].

  According to this configuration, by fixing the first shaft member and the second shaft member to the first steel member and the second steel member, respectively, the first shaft member associated with shear displacement deformation of the first connection portion and the second connection portion And it can prevent the pulling out failure of the 2nd shaft material. As a result, even if shear displacement occurs in the first connection portion and the second connection portion, it is possible to avoid that the shear transfer performance is rapidly reduced.

[Thought 5]
The existing building has a sleeve wall constituting a pillar with a sleeve wall together with the first existing pillar,
The said reinforcing wall is joined to the said pillar with a sleeve wall. The earthquake resistant reinforcing structure of the existing building as described in any one of [Thought 1] to [Thought 4].

  According to this configuration, since the laying range of the reinforcing wall extends to the sleeve wall, the strength of the reinforcing wall can be enhanced.

  11 ... existing building, 12 ... existing column, 12s ... first existing column, 12t ... second existing column, 13 ... existing beam, 13b ... foundation beam, 14 ... outer wall, 14s ... sleeve wall, 14w ... waist wall, 15 ... Openings, 16: Earthquake resistant reinforcement structure, 17: Column with sleeve, 20: Reinforcement wall, 21: First shaft, 21s: Shaft, 22: First steel, 23: Rebar, 24: Concrete body, 27 ... 1st connection part, 30 ... Reinforcement beam, 31 ... 2nd shaft material, 32 ... 2nd steel material, 33 ... Reinforcement, 34 ... Concrete body, 34s ... Slit, 35 ... Sheet, 36 ... Reinforcement, 37 ... 2nd Coupling portion, 38: hinge structure, 39: fixture, 70: shock absorber.

Claims (5)

A seismic reinforcement structure for reinforcing an existing building having a first existing column, a second existing column arranged next to the first existing column, and an existing beam extending from the first existing column to the second existing column There,
A reinforcing wall joined to the first existing column, having a first connecting portion connected to an intersection of the first existing column and the existing beam;
A second connecting portion connected to an intersection of the second existing column and the existing beam;
A reinforcing beam extending from the first connection portion along the existing beam;
Equipped with
The said reinforcement beam has a hinge structure and is connected with a said 2nd connection part. The earthquake-resistant reinforcement structure of the existing building characterized by the above-mentioned. The said reinforcement beam is insulated with the said existing beam. The earthquake resistant reinforcement structure of the existing building of Claim 1 characterized by the above-mentioned. A steel reinforced concrete structure having a slit extending along the boundary between the reinforcing beam and the second connection portion, and integrally forming the reinforcing beam and the second connection portion;
A reinforcing member in which a base end is held by the reinforcing beam and a tip end is held by the second connection portion, and the bridging portion is bridged;
Equipped with
The said slit and the said reinforcement material comprise the said hinge structure. The earthquake-resistant reinforcing structure of the existing building of Claim 1 or Claim 2 characterized by the above-mentioned. The first connection portion includes a plurality of first shaft members driven into intersections of the first existing column and the existing beam;
And a first steel member fixed to the plurality of first shaft members,
The second connection portion includes a plurality of second shaft members driven into an intersection of the second existing column and the existing beam, and a second steel member fixed to the plurality of second shaft members. The anti-seismic reinforcing structure of the existing building as described in any one of Claim 1 to 3 characterized by these. The existing building has a sleeve wall constituting a pillar with a sleeve wall together with the first existing pillar,
The said reinforcing wall is joined to the said pillar with a sleeve wall. The earthquake resistant reinforcing structure of the existing building as described in any one of the Claims 1-4 characterized by the above-mentioned.