JP2006312859A - Aseismatic reinforcing structure and aseismatic reinforcing method for existing building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aseismatic reinforcing structure and an aseismatic reinforcing method for an existing building allowing construction only from the outside of the building and having excellent seismic resistance without using reinforcements and interposed reinforcing bodies (bracing members). <P>SOLUTION: In the aseismatic reinforcing structure of the existing building, a column body 12 or a beam body 14 located at the external wall surface of the existing building is provided with anchor bolts 18. Reinforcing shape steel 20 is fixed to the anchor bolts 18 and disposed at the column body 12 or beam body 14. Fiber reinforced concrete 28 is placed to surround the anchor bolts 18 and the reinforcing shape steel 20, and a steel frame concrete composite structural member comprising the reinforcing shape steel 20 and fiber reinforced concrete 28 is integrally provided at the external wall surface of the existing building. When the building strong against an earthquake is demanded, the reinforced part is provided with a bracing type or stud type seismic control member. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seismic reinforcing structure and a seismic reinforcing method for an existing building, and more particularly to an seismic reinforcing structure and a seismic reinforcing method for an existing building using a steel-concrete composite structural member.

  Conventionally, as a seismic reinforcement method for existing buildings, there is a steel frame that reinforces by installing reinforcement bodies on the opposing inner surfaces of the left and right columns of the existing building and the opposing inner surfaces of the upper and lower beams. The brace method was used.

  However, since sashes such as window glass and doorways are usually attached between the left and right column bodies and the upper and lower beam bodies, it is necessary to remove them once and reattach them at the time of reinforcement work. In this case, since the work is also performed from the inside of the building, it is inconvenient for the user of the building.

  Therefore, for example, Patent Document 1 proposes a seismic reinforcement method for an existing building that can be constructed by work from outside the building.

  As shown in FIG. 4, the reinforcement body in the seismic reinforcement structure disclosed in Patent Document 1 is provided with an anchor bolt 46 placed on a column body 42, and a steel plate 52 using a nut 48 and a seat plate 50 on the anchor bolt 46. And hoop bars 54 are arranged around the steel plate 52, and these are surrounded by a mold frame and concrete 56 is placed in the mold frame (a reinforced steel concrete member).

  Further, the seismic reinforcement structure makes the reinforcing body 40 stronger, and therefore, as shown in FIG. 5, the steel plates 52 attached to the column bodies 42 and the beam bodies 44 are intervening reinforcing bodies (stiffeners). Mainly connected and reinforced at 58.

  And in this patent document 1, since the said reinforcement body 40 is installed in the outer side of the column body and beam body which are located in the outer wall surface of an existing building, it becomes what can perform the earthquake-proof reinforcement of an existing building only by external work. Yes.

  However, in the seismic reinforcement structure shown in Patent Document 1, in order to give the reinforcement a high proof stress and toughness against stresses such as compression and tension caused by an earthquake, a steel sheet (steel frame) has a hoop (rebar). Therefore, the construction of the seismic reinforcement becomes complicated, and the entire process takes time and cost.

  Furthermore, since the steel frame uses a plate-shaped steel plate, it cannot be expected to improve the horizontal strength of the reinforced building. Therefore, there has been a need to reinforce by connecting columns and columns, beams and beams, or columns and beams with intervening reinforcing bodies (struts).

Japanese Patent No. 3051071

  The problem to be solved by the present invention is to provide a seismic reinforcement structure and a seismic reinforcement method for an existing building that can be constructed only from the outside of the building and does not use reinforcing bars and intervening reinforcements (strengthening materials) and has excellent earthquake resistance. There is to do.

  In order to solve the above problems, the seismic reinforcement structure for an existing building according to the present invention is, as described in claim 1, with anchor bolts placed on a column or beam positioned on the outer wall surface of the existing building, A steel-concrete composite structural member made of reinforcing steel and fiber reinforced concrete is provided with reinforcing steel fixed to the anchor bolt, fiber reinforced concrete is placed so as to surround the anchor bolt and reinforcing steel. The gist is that it is integrated with the outer wall surface of the existing building.

  In this case, in the seismic retrofit structure of the existing building, as described in claim 2, the steel-concrete composite structural member is provided on the outer wall surface of the column body via the anchor bolt, and the outside of the beam body is provided. The wall surface is preferably provided with the steel-concrete composite structural member, the conventional reinforced concrete member, or the steel member with or without the anchor bolt.

  Further, when a building that is more resistant to earthquakes is required, in the seismic reinforcement structure of the existing building, as described in claim 3, the reinforcing body of the column body made of the steel-concrete composite structural member and It is also possible to freely provide a striation-type seismic damping member in a frame surrounded by the steel-concrete composite structural member or the conventional reinforced concrete member or the reinforcing body of the beam body made of the steel member. .

  Similarly, in the seismic reinforcement structure of the existing building, as described in claim 4, between the reinforcement members of the beam body composed of the steel-concrete composite structural member or the conventional reinforced concrete member or the steel member, It is also possible to freely provide a vibration control member of the mold.

  On the other hand, the seismic reinforcement method for an existing building according to the present invention includes a step of placing an anchor bolt on a column or a beam located on the outer wall surface of the existing building, and reinforcing the anchor bolt as described in claim 5. Fixing the structural steel and disposing the structural steel on the outer wall surface side of the existing building, assembling a mold so as to surround the anchor bolt and the reinforcing structural steel, and a fiber in the mold It consists of a step of placing reinforced concrete, and the gist is to provide a reinforcing steel-fiber reinforced concrete member (steel concrete composite structural member) so as to be integrated with the outer wall surface of the existing building.

  According to the seismic reinforcement structure of an existing building according to claim 1, the fiber reinforced concrete is obtained by adding fibers to the concrete. If a steel-concrete composite structure is used, a reinforced steel concrete can be provided without a reinforcing bar. Because it has the same strength and deformation capacity as the structure, it can be seismically reinforced without using reinforcing bars, simplifying construction and reducing costs.

  In addition, because the steel frame is a shape steel with a strong resistance to bending, there is no need for intervening reinforcements (stiffeners) that were necessary in conventional seismic reinforcement structures, and reinforcement of columns and beams. It will be possible to reinforce existing buildings.

  Furthermore, since the steel-concrete composite structural member is firmly integrated with the column or beam of the outer wall surface of the existing building via anchor bolts, these reinforcing members act integrally with the existing building, The earthquake resistance of reinforced buildings will be improved.

  In the seismic reinforcement structure of the existing building, the column body is reinforced with the steel-concrete composite structural member via the anchor bolt, and the beam body includes the anchor bolt. Because it can be reinforced with the above-mentioned steel-concrete composite structural members or conventional reinforced concrete members or steel members without using the anchor bolts, it is not necessary to use conventional reinforced steel-concrete structural members, simplifying the construction And cost reduction. When the steel-concrete composite structural member is not used for the beam body, the construction can be further simplified and the cost can be further reduced.

  In addition, when a building that is more resistant to earthquakes is required, as described in claim 3, in the seismic reinforcement structure of the existing building, a frame surrounded by a reinforcing body applied to a column and a beam is used. It is also possible to freely install a striation-type damping member, which not only increases the resistance to vibration caused by earthquakes in the building, but also absorbs vibration energy from earthquakes and reduces vibration energy. It can reduce itself and prevent collapse.

  Similarly, as described in claim 4, in the seismic reinforcement structure of the existing building, it is also possible to freely provide a stud-type vibration control member between the reinforcements applied to the beam body, In addition to increasing the resistance to vibration, the vibration energy is reduced by absorbing the vibration energy caused by the earthquake, so that the building itself can be reduced to prevent collapse.

  On the other hand, according to the seismic reinforcement method for an existing building according to claim 5, since the steel-concrete composite structural member is placed on the column or beam located on the outer wall surface of the existing building, only from the outside of the building. Construction becomes possible, and the construction can be carried out while using the building, so that the user is not inconvenienced.

  Thus, it can be used for seismic reinforcement of multi-story multi-span buildings such as general buildings and apartment houses.

  An embodiment of the present invention will be described in detail with reference to FIGS.

  FIG. 1 shows an example of a seismic reinforcement structure for an existing building according to this embodiment, and is a cross-sectional view of a column 12 or a beam 14 and a steel-concrete composite structural member 10 of the existing building. As shown in the figure, a mounting hole 16 is formed in the existing column body 12 or the beam body 14, and an anchor bolt 18 is driven into the mounting hole 16 and fixed using an adhesive or the like. The shape steel 20 is passed through the anchor bolt 18 through the insertion hole 22 of the shape steel 20, and the shape steel 20 is fixed to the anchor bolt 18 with a nut 24 and a seat plate 26 interposed therebetween. Further, a fiber reinforced concrete 28 is placed so as to surround the anchor bolt 18 and the shaped steel 20.

  The steel-concrete composite structural member 10 includes at least a section steel 20 and fiber reinforced concrete 28.

  Examples of the shape steel 20 include H-shape steel, I-shape steel, groove-shape steel (cross-section saddle shape), and angle steel (cross-section L-shape) classified according to the cross-sectional shape thereof. More preferably, they are H-shaped steel, I-shaped steel, groove-shaped steel (cross-section saddle shape) and the like. This is because they have a high yield strength against stresses such as tension, bending, and compression.

  On the other hand, a plate-shaped steel plate is not preferable because it has high tensile strength but low bending strength.

  In the present embodiment, since the shape steel is used as a steel frame material, the reinforcement body has improved bending strength in the direction parallel to the outer wall surface and horizontal strength. Therefore, the horizontal strength is improved in the conventional seismic reinforcement method. It is no longer necessary to use intervening reinforcing bodies (stiffeners) that were necessary to increase the height, and the existing building can be reinforced only by reinforcing the pillars and beams.

  The fiber added to the fiber reinforced concrete 28 is preferably vinylon fiber, stainless fiber or the like.

  By adding fibers such as vinylon fiber and stainless fiber to the concrete to form a steel-concrete composite structure, the steel has a proof strength and deformation capacity comparable to those of a reinforced steel-concrete structure. As a result, seismic reinforcement is possible with steel-framed concrete that does not use reinforcing bars, which simplifies construction and reduces costs.

  FIG. 2 is a diagram illustrating an example of a state in which anchor bolts 18 and H-section steel 20 are arranged on the column 12 and the beam 14 on the outer wall side of the existing building. As shown in the figure, H-section steel 20 is arranged in the column body 12 in the vertical direction and in the beam body 14 in the horizontal direction, and is fixed to anchor bolts 18 that are placed at appropriate intervals. .

  In this embodiment, since the H-shaped steel having high strength against stress such as tension, bending, and compression is used for the steel frame material instead of the plate-shaped steel plate used in the conventional seismic reinforcement method, the column There is no need for an interstitial reinforcement (strengthening material) for reinforcing the space between the H-shaped steels 20 respectively disposed on the beam 12 and the beam 14.

  One H-section steel 20 a and another adjacent H-section steel 20 b are joined by a joining member 30. As a result, the existing building is reinforced as a reinforcing column or a reinforcing beam having a higher yield strength and toughness.

  FIG. 3 shows an example of seismic reinforcement in a multi-storey building such as a building or an apartment house. The seismic reinforcement structure shown in the figure illustrates the case where it is applied to an existing column body and an existing beam body exposed on a corridor side such as a veranda in an apartment house.

  A through hole 34 is formed in the vertical direction of the corridor 32 on the outer wall side of the existing column body 12 and the existing beam body 14, and the anchor bolt 18 and the H-shaped steel 20 are installed in the existing column through the through hole 34 in the vertical direction. Located on the body 12. On the other hand, the anchor bolt 18 and the H-shaped steel 20 are also arranged in the existing beam body 14 in parallel with the hallway 32. A concrete formwork is arranged so as to surround these H-shaped steels 20, fiber-reinforced concrete 28 is placed, and the steel-frame concrete composite structural member 10 is connected to the existing column 12 and the existing beam 14.

  In addition, although the H-section steel 20 is arrange | positioned in this steel-frame concrete composite structural member 10, it joins with the other H-section steel which moves up and down with the one H-section steel, and is united. Therefore, the existing column 12 can be reinforced even when the number of layers extends.

  The seismic reinforcement structure shown in FIG. 2 and the like, which is the content of the present invention, provides the strength of the seismic reinforcement body to the frame body surrounded by the column body and the beam body reinforcement body as in the conventional earthquake resistance reinforcement structure shown in FIG. Since no interstitial reinforcing body (stiffener) is provided for the supplement, various vibration control members such as a staggered type and a stud type can be attached inside the frame.

  In view of this, a description will be given below of a seismic reinforcement structure including a seismic reinforcement member attached to the seismic reinforcement structure.

  FIG. 4 is a diagram showing a structure of a reinforcing member such as a steel-concrete composite structural member integrally provided on a column and a beam located on the outer wall surface of an existing building. ) Is an example of a seismic reinforcement structure. FIG. 4 (a) shows one frame-type vibration damping member provided on the frame, and FIG. 4 (b) shows two line-type vibration control members. In FIG. 4B, the column side is reinforced by the concrete composite structural member 10 and the beam side is reinforced by the steel member 11, but it is not particularly limited.

  For example, the damping member (35a, 35b) is formed by connecting a joint such as a clevis joint 39 provided at an end of the damping member (35a, 35b) to a casette 38 attached to the frame with a pin, a bolt, or the like. Can be fixed and installed in buildings.

  This vibration control member (35a, 35b) absorbs vibration energy applied to the building due to an earthquake or the like to a part of a rigid support (37a, 37b) made of cylindrical or bar steel, concrete, etc. It has dampers (36a, 36b) for reducing the size. As the dampers (36a, 36b), for example, an oil damper or a viscoelastic damper that exhibits damping performance against vibration applied to a building using a speed-dependent viscous resistance, energy consumption accompanying deformation history of the member is used. There are hysteretic dampers that exhibit damping performance when used.

  The oil damper absorbs seismic energy by, for example, a resistance force generated when oil passes through a valve provided in the cylinder due to a pressure difference caused by pushing and pulling the oil filled in the cylinder.

  Viscoelastic dampers include, for example, those having a basic structure in which a viscoelastic body such as a polymer material is sandwiched between steel materials. When the steel materials are displaced from each other by vibration, the viscoelastic body is It can be deformed to absorb vibration energy.

  The hysteretic damper absorbs vibration energy by utilizing plastic deformation of a low yield point steel material or the like. Examples of the distorted type include those using a low yield point steel material as a core material inside a buckling stiffener for preventing buckling.

  FIG. 5 is an example of an earthquake-resistant reinforcement structure in which a stud-type damping member 35c is provided between reinforcement bodies such as steel-concrete composite structural members that are integrally provided on a beam body located on the outer wall surface of an existing building. . In the figure, the pillar side is reinforced by the concrete composite structural member 10 and the beam side is reinforced by the steel member 11, but it is not particularly limited.

  The damping member 35c also has a damper 36c for absorbing vibration energy applied to the building due to an earthquake or the like and reducing the displacement of the building, as in the case shown in FIG. Examples of the damper 36c of the stud type vibration control member 35c include a viscoelastic damper and a hysteretic damper.

  Similar to the muscular type, a viscoelastic material such as a polymer material is used for the viscoelastic damper, and a hysteretic damper includes a material using a low yield point steel material for a part of the stud.

  As shown in FIGS. 4 and 5, not only increases the resistance to vibration caused by earthquakes in the building, but also absorbs vibration energy caused by earthquakes and reduces vibration energy, thereby reducing the vibration of the building itself and collapsing. Can be prevented. And since an earthquake-resistant structure and a vibration control structure are combined, it can be set as a building strong against an earthquake.

  Next, the seismic reinforcement method for an existing building according to this embodiment will be described. This seismic reinforcement method includes the following steps (1) to (4).

  Step (1) is a step of placing an anchor bolt on a column or beam positioned on the outer wall surface of an existing building.

  In this case, the anchor bolts may be placed on both the column body and the beam body, or only the column body or the beam body. Then, it is placed at a fixed pitch on the pillars and beams of the existing building. The anchor bolts may be driven in a line along the axial direction of the column or beam, or may be driven in two or three lines. Preferably, they are placed in a plurality of rows. This is because the steel-concrete composite structural member is more firmly fixed to the column or beam. The anchor bolt is fixed by an adhesive or the like when it is placed on a column or beam.

  Step (2) is a step of fixing the reinforcing structural steel to the anchor bolt and arranging the reinforcing structural steel on the outer wall surface side of the existing building.

  For example, the shape steel can be arranged at a position of about 10 cm from the existing column body and attached to the anchor bolt.

  In this case, the fixing of the H-shaped steel with the anchor bolt may be performed on both the column body and the beam body, or may be performed only on the column body or only the beam body by placing the anchor bolt.

  For example, when fixing the H-shaped steel with anchor bolts only to the column body, the column body is reinforced with a steel-concrete composite structural member, while the beam body is a steel-concrete composite structural member or existing member without an anchor bolt. It can be reinforced with conventional reinforced concrete members and steel members.

  Step (3) is a step of assembling a mold so as to surround the anchor bolt and the reinforcing structural steel.

  Step (4) is a step of placing fiber reinforced concrete in the mold. Concrete is placed so as to wrap the anchor bolt and the reinforcing steel.

  As described above, in the seismic reinforcement method for an existing building according to the present invention, since the above-described steel-concrete composite structural member is used, both the rigidity and the proof stress of the column body and the beam body with respect to stress such as bending, compression, and tension due to the earthquake Since it has a sufficient value, an intervening reinforcement body (stiffener), which was necessary in the conventional construction method, becomes unnecessary, and the existing building can be reinforced only by reinforcing the columnar body and the beam body.

  At least through the steps (1) to (4), the seismic reinforcement method for an existing building of the present invention is carried out. And since the said steel-frame concrete composite structural member becomes what was provided in the outer wall surface of the said existing building, and acts integrally with the existing building, the earthquake resistance of the existing building will improve. In addition, the construction can be performed only from the outside of the building, and the construction can be performed while using the building. As a result, the user of the building does not feel inconvenience.

  In addition, it is also possible to incorporate the process of attaching the said damping member. In this case, since the seismic structure and the vibration control structure are combined, the building can be made more resistant to earthquakes.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, although only the H-shaped steel is shown in the above embodiment, the cross-sectional shape of the used steel may be I-shaped or L-shaped. Moreover, even if it is H-section steel, the position which lets an anchor bolt pass may be the web part, or a flange part.

  The seismic strengthening structure and seismic strengthening method for existing buildings according to the present invention can be used for seismic reinforcement of various building structures such as steel reinforced concrete architecture, reinforced concrete architecture, steel construction, and civil engineering structures as necessary. .

It is principal part sectional drawing of the existing pillar body or existing beam body and steel-frame concrete composite structural member which concerns on one Embodiment of this invention. It is the figure which showed the state which has arrange | positioned the anchor bolt and H-section steel to the pillar and beam body by the side of the outer wall of an existing building. It is sectional drawing of the reinforcement structure in multi-storey buildings, such as a building and an apartment house. It is an example of the earthquake-proof reinforcement structure which provided the strut type | mold damping member in the frame which consists of the reinforcement body provided in the column and beam body of the outer wall side of the existing building. It is an example of the earthquake-proof reinforcement structure which provided the stud-type vibration control member between the reinforcement bodies provided in the beam body of the outer wall side of the existing building. It is sectional drawing of the reinforcement structure of the existing building using the conventional reinforced steel concrete method. It is the figure which showed the structure before concrete placement in the reinforced steel concrete method using the conventional intervening reinforcement body (strengthening material).

Explanation of symbols

10 Steel-concrete composite structural member 12 Column 14 Beam 18 Anchor bolt 20 Shape steel (steel)
28 Fiber reinforced concrete 35a, 35b, 35c Damping members 36a, 36b, 36c Damper

Claims (5)

  A seismic reinforcement structure for an existing building, in which an anchor bolt is placed on a column or a beam located on the outer wall surface of the existing building, and a reinforcing structural steel is fixed to the anchor bolt. Fiber reinforced concrete is cast so as to surround the structural steel, and a steel-concrete composite structural member made of reinforcing structural steel and fiber reinforced concrete is provided integrally with the outer wall surface of the existing building. Seismic reinforcement structure for existing buildings.   The steel-concrete composite structural member is provided on the outer wall surface of the column body via the anchor bolt, and the steel-concrete composite material is provided on the outer wall surface of the beam body via the anchor bolt or without the anchor bolt. 2. The seismic reinforcement structure for an existing building according to claim 1, wherein a structural member, a conventional reinforced concrete member or a steel frame member is provided.   The frame body surrounded by the reinforcing body of the column body made of the steel-concrete composite structural member and the steel-concrete composite structural member or the conventional reinforced concrete member or the reinforcing body of the beam body made of the steel member, The seismic reinforcement structure for an existing building according to claim 1, wherein an irregular vibration control member is provided.   3. A stud-type vibration control member is provided between reinforcing members of the beam body composed of the steel-concrete composite structural member, the conventional reinforced concrete member, or the steel member. Seismic reinforcement structure for existing buildings as described. A seismic reinforcement method for an existing building, the step of placing an anchor bolt on a column or beam located on the outer wall surface of the existing building, and fixing the shape steel for reinforcement to the anchor bolt. It consists of a step of arranging on the outer wall surface side of an existing building, a step of assembling a mold so as to surround the anchor bolt and the reinforcing steel, and a step of placing fiber reinforced concrete in the mold. A seismic reinforcement method for an existing building, wherein a structural steel-fiber reinforced concrete member (steel concrete composite structural member) is provided so as to be integrated with an outer wall surface of the existing building.

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