JP5329908B2 - Seismic reinforcement structure of existing building and its construction method - Google Patents

Description

  The present invention relates to a seismic reinforcement structure for an existing building and a construction method thereof, and more particularly, seismic reinforcement of an existing building in which a reinforcing member is integrally installed and fixed in a frame surrounded by columns and beams of the existing building. It relates to the structure and its construction method.

  As shown in FIGS. 11 and 12, the conventional reinforced concrete structure (RC structure) or steel-framed reinforced concrete structure (SRC structure) is constructed with pillars 11 and 12 and beams 13 and 14 as shown in FIGS. It is known that a reinforcing member 4 such as a steel brace with a frame or a reinforcing wall made of reinforced concrete is installed and fixed in the frame 1 or the side surface 1s of the frame 1 to increase the rigidity and proof strength of the building. This construction method is roughly divided into a post-construction anchor method, a bonding method, and a steel pipe cotter method, depending on the difference in the joining method between the existing building (frame) and the reinforcing member.

  The post-installed anchor method is to provide a large number of studs on the outer peripheral surface of the reinforcing member, place anchor reinforcing bars on pillars and beams, etc., reinforce the portions with spiral reinforcing bars, and then mortar between the frame and the reinforcing member. It is widely used as a technique for integrating an existing building (frame) and a reinforcing member by a method of filling a filler. This type of construction method is described in Patent Document 1 and the like.

  The bonding method is a method in which a frame (its surface) and a reinforcing member (its outer peripheral surface) are bonded with an adhesive such as an epoxy resin, and this bonding method is also used in other methods. This type of construction method is described in Patent Document 2 and the like.

  In the steel pipe cotter method, a large number of studs are provided on the outer peripheral surface of the reinforcing member, the steel pipe cotter is fixed to the frame (the hole provided in the frame) with an adhesive, and a filler such as mortar between the frame and the reinforcing member The method of filling is used. This type of construction method is described in Patent Document 3 and the like.

JP 2007-332555 A Japanese Patent Laid-Open No. 11-71906 JP 2003-49547 A

  However, with the conventional post-installation anchor method, holes are drilled in pillars and beams with a hammer drill, etc., so there is a problem that large vibration and noise occur during construction, and it cannot be adopted for reinforcement work while using buildings. is there. In addition, the conventional bonding method is superior to the construction anchor method in that vibration and noise problems do not occur, but there is a problem that the reinforcing effect is reduced compared to the post-construction anchor method. Furthermore, in the conventional steel pipe cotter method, holes are drilled in the housing with a machine such as a core drill, so the core drill is a large-scale machine that has poor mobility and is difficult to say that workability is good. Water is necessary because the water scatters, and there is a problem that the treatment must be complicated.

  The present invention solves such a conventional problem. In the seismic reinforcement structure of this type of existing building and its construction method, it is possible to suppress the occurrence of vibration and noise as much as possible, the post-construction anchor method, etc. Has the same reinforcing effect as the conventional method, does not use large tools and machines, installs in a dry manner without the need for water, and applies regardless of RC or SRC buildings For purposes.

To achieve the above object, seismic reinforcement structure of an existing building according to the present invention, reinforcement member is Installation on the side surface of the rack premises or Frame surrounded by the columns and beams of the existing buildings, the said reinforcing member in seismic reinforcement structure of an existing building solidifying material is fixed integrally filled between the Frame, in between said reinforcing member Frames, a plurality of shear keys are Installation fixed to Plane of the Frames Each of the shear keys is a linear plate material and is a combination of a plurality of plate materials, and has a horizontal cross-sectional shape of approximately X shape, approximately V shape, approximately T shape, approximately H shape, approximately U shape, approximately B shape, or approximately I shape. And has a substantially X-shaped, V-shaped, T-shaped, H-shaped, U-shaped, B-shaped, or I-shaped flat surface so that each shear key can be inserted into the frame by a concrete cutter. Multiple cuts formed in the shape and not deep enough to reach the column or beam Placed inserted into the kerf, it is fixed by the solidified material, and summarized in that.

In this case, it is preferable that the framed Steel Brace or reinforced concrete reinforcing wall is employed reinforcement member.

To achieve the above object, Seismic Retrofit for existing buildings of the present invention, a reinforcement member and Installation on the side surface of the rack premises or Frame surrounded by the columns and beams of the existing buildings, the said reinforcing member In the seismic retrofitting method for an existing building , which is fixed integrally by filling with a solidifying material between the frame, a plurality of shear keys are used for joining the reinforcing member and the frame, and a plurality of linear plate materials are used for each shear key. Which has a horizontal cross-sectional shape of substantially X shape, approximately V shape, approximately T shape, approximately H shape, approximately U shape, approximately B shape, or approximately I shape, Between the frame, a plurality of kerfs for installing each shear key on the frame surface of the frame are linear, approximately X-shaped, approximately V-shaped, approximately T-shaped A flat of approximately H shape, approximately U shape, approximately B shape, or approximately I shape Shape and form cut to a depth not reaching the pillar muscle or beam muscles, the installed plug to a respective shear keys each kerf and fixed by solid reduction material is summarized in that.

The seismic reinforcement structure and method of the present invention have the following special effects by the above-described configuration and method.
(1) A plurality of grooves are cut into the frame surface of the frame, plate-like shear keys are inserted into these grooves, and a solidification material is filled between the frame and the reinforcing member together with the grooves, and the frame and the reinforcing member Therefore, the frame and the reinforcing member can be reliably and easily integrated.
(2) In this case, a plurality of grooves can be cut into the frame of the frame with a small tool such as a concrete cutter, and plate shears are inserted into these grooves and fixed with a solidifying material. When installing and fixing reinforcement members in the construction surface, unlike the conventional post-installed anchor method, a large number of reinforcing bars are driven into the construction surface of the frame to generate vibration and noise as much as possible. This seismic reinforcement work can be carried out while using the building.
(3) Moreover, the gap between the frame and the reinforcing member is filled with a solidifying material together with each kerf, and the frame and the reinforcing member are integrated by the friction force after curing of the solidifying material. The sheer key fixed to the kerf by hardening of the solidifying material highly enhances the integrity of the frame and the reinforcing member, so that at least the same reinforcing effect as that of the conventional construction method such as the conventional post-construction anchor method can be obtained.
(4) Also, by adopting such a structure and construction method, the work of cutting a plurality of kerfs into the construction surface of the frame, the work of inserting a plate-like shear key into these kerfs, the frame and the reinforcing member together with each kerf In any case of filling the solidifying material between the two, a large-scale tool and machine are not required, and the construction can be performed dry without the need for water.
(5) Furthermore, the depth of the kerf into which the shear key is inserted may be within 40 mm, and can be applied regardless of the RC or SRC building.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings. 1 to 5 show a first embodiment. As shown in FIG. 1, the seismic reinforcement structure of the existing building includes a frame 1 surrounded by columns 11 and 12 and beams 13 and 14 of the existing building, and a reinforcement that is integrally installed and fixed in the frame 1. And the member 4.

  As shown in FIG. 1, the frame 1 is composed of columns 11 and 12 and beams 13 and 14 of an existing building made of reinforced concrete, and is laid horizontally above and below the columns 11 and 12 standing at a predetermined interval. It has a rigid frame structure in which the beams 13 and 14 are rigidly joined. The frame 10 of the frame 1, that is, the left side of the right column 11 and the right side of the left column 12, the lower surface of the upper beam 13, and the upper surface of the lower beam 14 have two rows in the width direction and a predetermined length in the length direction. Linear kerfs 2 are cut and formed at a plurality of positions at intervals. These kerfs 2 are formed in a linear shape into which a plate material can be inserted using a tool such as a concrete cutter, and a plate-like shear key 3 is inserted and installed. The shear key 3 used here is composed of a combination of linear, in particular, linear plate materials. In this case, as shown in FIG. 2, an angle material having a substantially V-shaped horizontal cross section is adopted, and FIG. As shown in the figure, the kerf 2 has a substantially X-shaped, V-shaped or T-shaped planar shape so that the shear key 3 can be inserted, and the column bars of the columns 11 and 12 and the beam bars of the beams 13 and 14. Cut to a depth not reached. Then, a shear key 3, that is, an angle member 3 is inserted and installed in these kerfs 2.

  As shown in FIG. 1, the reinforcing member 4 is a member that increases the rigidity and proof stress of the building. In this case, a steel frame brace with a frame is adopted as the reinforcing member 4. The steel brace 4 is composed of a frame 41 and a diagonal member 42, and has a stud bolt 5 and a spiral reinforcement (spiral reinforcing reinforcement) 6 on the outer periphery thereof. The frame 41 is formed in a substantially rectangular frame shape so that it can be joined to the structural surface 10 of the frame 1. In this case, an H-shaped steel is adopted as the frame material, and one groove of the H-shaped steel is assembled in a substantially B shape when viewed from the front with the other groove facing the outer circumferential direction. A diagonal member 42 is joined in a V shape within the frame 41. In this case, the diagonal member is made of H-shaped steel, and is assembled in a V shape between the upper corners of the frame 41 and the lower center. In this way, in order to improve the bondability of the frame 41 and the frame 1 to the outer periphery of the framed steel brace 4, a plurality of stud bolts 5 are perpendicular to the outer peripheral surface of the frame 41 as shown in FIGS. 4 and 5. In this case, it is welded in a row at a predetermined interval in the center in the width direction at the bottom of the groove of the H-shaped steel. Furthermore, in order to prevent splitting occurring at the joint between the steel brace 4 and the frame 1, the spiral bars 6 are arranged in parallel with each part of the frame 41, and in this case, the bars are passed through the grooves of the H-shaped steel. Is done.

  In this way, the framed steel brace 4 is installed in the frame 1, and an epoxy resin adhesive and grout material are provided in each groove 2 of the frame 10 and the gap between the frame 1 and the frame 41 of the framed steel brace 4. Then, the solidified material such as concrete is filled, and the frame 1 and the framed steel brace 4 are joined. The frame 1 and the framed steel brace 4 are integrated by the frictional force after the solidifying material is hardened, and the frame 1 and the frame are fixed by the shear key 3 fixed to the kerf 2 of the structural surface 10 by the hardening of the solidifying material. The unity of the steel brace 4 with the frame is highly enhanced, and the joint strength between the steel brace 4 with the frame and the solidified material is enhanced by the stud bolt 5 and the spiral reinforcement 6 embedded in the outer periphery of the framed steel brace 4. In the event of an earthquake, the stress transmission between the frame 1 and the framed steel brace 4 is sufficient, and the shearing force is sufficiently transmitted between the frame 1 and the framed steel brace 4. Thereby, the structure which enlarges the rigidity and proof stress of a building can be obtained.

  Subsequently, a method for constructing the reinforcing structure will be described with reference to FIG. 1 and FIGS. 6 and 7. First, as shown in FIG. 6, the shear key 3 is installed on the structural surface 10 of the frame 1, that is, the left side surface of the right column 11 and the right side surface of the left column 12, and the lower surface of the upper beam 13 and the upper surface of the lower beam 14. A cut groove 2 is formed by cutting. In this case, the kerfs 2 are cut linearly (in a straight line) so that the plate material can be inserted into a plurality of locations on the construction surface 10 in two rows in the width direction and at predetermined intervals in the length direction using a tool such as a concrete cutter C. In this construction method, a linear (straight) plate material composed of a combination of a plurality of plate materials is used for the shear key 3, and in this case, an angle material having a horizontal cross-sectional shape formed in a substantially V shape is employed. Therefore, the shear key 3 can be inserted into the kerf 2, and each kerf 2 is linear (straight), has a substantially X-shaped, substantially V-shaped or substantially T-shaped planar shape, and the pillars of the pillars 11, 12. Cut to a depth that does not reach the beam S1 and the beam S2 of each beam 13,14. Then, as shown in FIG. 7, a shear key angle member 3 is inserted and installed in these kerfs 2.

  Next, referring to FIG. 1, a framed steel brace is adopted as the reinforcing member 4, and the framed steel brace is assembled and installed in the frame 10 of the frame 1. The framed steel brace 4 is assembled by a frame 41, diagonal members 42, stud bolts 5, and spiral bars 6. The entire frame 41 is formed into a substantially rectangular frame shape so that the frame 41 can be joined to the structural surface 10 of the frame 1. In this case, an H-shaped steel is used for the frame member, and one groove of the H-shaped steel is assembled in a substantially B shape when viewed from the front with the other groove facing the inner circumferential direction. And the diagonal member 42 is joined in this frame 41 in V shape. In this case, H-shaped steel is used for the diagonal member and is assembled in a V shape between the upper corners of the frame 41 and the lower center. In this way, a plurality of stud bolts 5 and spiral bars 6 are attached to the outer periphery of the framed steel brace 4. The plurality of stud bolts 5 are fixed to the outer peripheral surface of the frame 41 perpendicularly, and in this case, the stud bolts 5 are welded in a row at a predetermined interval to the center in the width direction at the bottom of the groove of the H-shaped steel. The spiral reinforcement 6 is arranged in parallel with each part of the frame 41, and in this case, the reinforcement is passed through the groove of the H-shaped steel.

  Then, although not shown, the space between the frame 41 of the steel brace 4 and the frame 1 is sealed with a mold, and the gap 2 between the frame 10 of the frame 1 and the gap between the frame 1 and the frame 41 is formed. A solidified material such as an epoxy resin adhesive, a grout material, or concrete is filled to join the frame 1 and the framed steel brace 4 together.

  As described above, in this seismic reinforcement structure and construction method, a plurality of kerfs 2 are cut into the construction surface 10 of the frame 1, and plate-like shear keys 3 are inserted into these kerfs 2, together with the kerfs 2, the frame 1. Since the solidified material is filled between the frame 1 and the framed steel brace 4 and the frame 1 and the framed steel brace 4 are joined together, the frame 1 and the framed steel brace 4 can be reliably and easily integrated. it can. In this case, a plurality of kerfs 2 can be easily cut into the framing surface 10 of the frame 1 using a small tool such as a concrete cutter C, and a plate-like shear key 3 is inserted into these kerfs 2 and solidified. Because it is fixed with the material, when constructing and fixing the framed steel brace 4 in the structural surface 10 of the frame 1, a number of tanker rebars are driven into the frame surface as in the conventional post-installed anchor method. Unlike this, vibration and noise can be greatly reduced, and this seismic reinforcement work can be carried out while using the building. Moreover, a solidifying material such as an epoxy resin adhesive, a grout material, or a concrete is filled in each gap 2 of the structural surface 10 and a gap between the frame 1 and the frame 41 of the framed steel brace 4. The frame 1 and the framed steel brace 4 are integrated with each other by the frictional force after hardening, and the frame 1 and the framed steel brace are fixed together by shear keys 3 fixed to the kerfs 2 of the frame 10 by hardening of the solidified material. Since the unity of 4 is highly enhanced, it is possible to obtain at least a reinforcing effect equivalent to that of a conventional method such as a conventional post-construction anchor method. Further, by adopting such a reinforcing structure and construction method, large-scale tools and machines are not used in each work, and it is possible to perform a dry construction without requiring water. Furthermore, the depth required for the kerf 2 may be within 40 mm, and this reinforcing structure and construction method can be applied regardless of RC or SRC buildings.

  8 and 9 show a second embodiment of the present invention. In the second embodiment, only the shape and structure of the shear key and the shape of the kerf are different from the first embodiment, and the other points are common to the first embodiment. In this seismic reinforcement structure and construction method, a sheer key that is a linear (straight) plate material and a combination of a plurality of plate materials is employed. In this case, as shown in FIG. A substantially II-shaped groove steel 32 formed by combining substantially I-shapes, and a stud bolt 33 fixed on the intermediate surface of the groove steel 32 are formed. Further, the kerf is formed in a linear (straight) shape so that a plate material can be inserted by using a tool such as a concrete cutter. In this case, as shown in FIG. It is linear (straight) so that it can be inserted, and is cut into a substantially II-shaped planar shape consisting of a combination of approximately I-shaped shapes, and to a depth that does not reach the column reinforcement of each column and the beam reinforcement of each beam. Then, both side surfaces of the grooved steel 32 are inserted into these kerfs 21, and the stud bolts 33 are installed on the structural surface 10 of the frame 1 through the grooved steel 32. Even if it does in this way, there can exist the same effect as 1st Embodiment.

  FIG. 10 shows a third embodiment. In the seismic reinforcement structure shown in FIG. 10, the right half is according to this embodiment, and the left half is according to a conventional post-construction anchor method. In the third embodiment, a reinforced concrete (RC) reinforcing wall is employed as the reinforcing member. In this reinforcing structure and construction method, the kerf 2 is linear (straight) in a plane shape of approximately X shape, approximately V shape, or approximately T shape on the structural surface 10 of the frame 1 as in the first embodiment. In addition, a shear key 3 made of a linear (straight) plate material is formed in the kerf 2 at a depth not reaching the beam of each column 11, 12 and the beam of each beam 13, 14, The angle member 3 is inserted and installed, and a spiral line 6 is arranged in that part. And after arranging the reinforcing bar 43 of the reinforcement wall 4 using these shear keys 3, the concrete 44 is laid. In this manner, the reinforcing wall 4 is integrally installed and fixed in the frame 1. Even if it does in this way, there can exist the same effect as 1st Embodiment.

  In each of the above embodiments, the shear key is formed in a substantially V-shaped or substantially I-shaped horizontal cross-sectional shape, and the cut groove is formed in a substantially X-shaped, substantially V-shaped, or substantially T-shaped so that the shear key can be inserted. However, the shape of the shear key is not limited to this, and may be any combination of linear (straight) plate materials, for example, approximately X shape, approximately T shape, approximately H shape, approximately U shape, It can be appropriately changed to various horizontal cross-sectional shapes such as a generally round shape, and the kerf is linear (straight) and can be inserted according to the shape of the shear key, for example, approximately X-shaped, approximately T-shaped, approximately H-shaped It can be appropriately changed to various planar shapes such as a shape, a substantially U shape, and a substantially B shape.

  Further, in each of the above embodiments, the earthquake-proof reinforcement structure of an existing building and its construction method in which the reinforcing member is integrally installed and fixed in the frame surrounded by the columns and beams of the existing building have been described. The present invention can be similarly applied to a case where a reinforcing member is integrally installed and fixed to a side surface of a frame surrounded by columns and beams of an existing building (see FIG. 12). A linear (straight) kerf that can be inserted into a plate material is formed on the frame surface of the frame that is in contact with each other, and a plate-like shear key is inserted into the kerf, and the kerf, frame, and reinforcing member are installed. What is necessary is just to fill with a solidification material between and to join a frame and a reinforcement member. In this case, the shear key is formed in a horizontal cross-sectional shape such as approximately X-shaped, approximately V-shaped, approximately T-shaped, approximately H-shaped, approximately U-shaped, approximately B-shaped or approximately I-shaped, and the groove is inserted into the shear key. Possibly cut into a flat shape such as approximately X, approximately V, approximately T, approximately H, approximately U, approximately B or approximately I, and to an appropriate depth that does not reach the column or beam. Just put it in. Even if it does in this way, the effect similar to said each embodiment can be acquired.

Front sectional view showing the seismic reinforcement structure of the existing building in the first embodiment of the present invention Horizontal sectional view showing the shear key used in the reinforcement structure Plan view showing kerfs formed on the construction surface of the frame used in the reinforcement structure Sectional view showing the main part of the reinforcing structure (vertical sectional view perpendicular to the direction in which the beam is bridged) Sectional view showing the main part of the reinforcing structure (vertical sectional view parallel to the direction in which the beam is bridged) (A) Of the seismic reinforcement method for an existing building according to the first embodiment of the present invention, in particular, a plan view showing a state in which a cut groove is cut and formed in the frame of the frame (b) a sectional view thereof (A) The top view which shows the state which inserts and installs a shear key in the cut groove of the structural surface of a frame among the seismic reinforcement methods of the existing building in the 1st Embodiment of this invention (b) The sectional drawing Partial front sectional view showing the seismic reinforcement structure and method of an existing building in the second embodiment of the present invention Perspective view showing shear key used in the reinforcing structure and construction method Front sectional drawing which shows the seismic reinforcement structure and construction method of the existing building in the 3rd Embodiment of this invention (A) Shows the basic concept of a conventional seismic reinforcement structure and its construction method for a conventional building in which a reinforcing member such as a steel brace with a frame is integrally installed and fixed in a frame surrounded by columns and beams of the existing building. A-A line sectional view in figures (b) and (a) (A) The figure which shows the basic concept of the seismic reinforcement structure of the existing building which integrally installs and fixes reinforcement members, such as a framed steel brace, on the side of the frame surrounded by the pillar and beam of the existing building, and its construction method (B) BB sectional view in (a)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 10 Construction surface 11, 12 Column S1 Column reinforcement 13, 14 Beam S2 Beam reinforcement 2 Cut groove 21 Cut groove 3 Shea key 31 Shea key 32 Channel steel 33 Stud bolt 4 Reinforcement member (framed steel brace, reinforced concrete reinforcement wall )
41 Frame 42 Diagonal 43 Reinforcing bar 44 Concrete 5 Stud bolt 6 Spiral bar C Concrete cutter

Claims (3)

Existing Buildings reinforcement member to the side of the rack premises or Frame surrounded by the columns and beams of existing buildings are Installation solidified material between said reinforcing member Frames are fixed integrally filled In the seismic reinforcement structure of
In between it said reinforcing member Frames, a plurality of shear keys are Installation fixed to Plane of the Frames,
Each of the shear keys is a linear plate material and is a combination of a plurality of plate materials, and has a horizontal cross-sectional shape of approximately X shape, approximately V shape, approximately T shape, approximately H shape, approximately U shape, approximately B shape, or approximately I shape. In addition, the plane shape of the linear shape is substantially X-shaped, substantially V-shaped, substantially T-shaped, substantially H-shaped, substantially U-shaped, substantially B-shaped, or substantially I-shaped so that each shear key can be inserted into the surface of the frame by a concrete cutter. And inserted into a plurality of kerfs formed at a depth not reaching the column or beam, and fixed by a solidifying material .
A seismic reinforcement structure for existing buildings. The seismic reinforcement structure for an existing building according to claim 1, wherein a steel brace with a frame or a reinforcing wall made of reinforced concrete is adopted as the reinforcing member . Seismic reinforcement of an existing building in which a reinforcing member is installed in the frame surrounded by columns and beams of the existing building or on the side of the frame, and a solidifying material is filled between the reinforcing member and the frame and fixed integrally. In the construction method,
A plurality of shear keys are used for joining the reinforcing member and the frame,
Each of the shear keys is a linear plate material, which is a combination of a plurality of plate materials, and has a horizontal cross-sectional shape of approximately X shape, approximately V shape, approximately T shape, approximately H shape, approximately U shape, approximately B shape, or approximately I shape. Adopt the thing,
Between the reinforcing member and the frame, a plurality of kerfs for installing the shear keys on the frame surface of the frame are linear and substantially X-shaped or substantially V-shaped so that the shear keys can be inserted by a concrete cutter. Alternatively, a substantially T-shaped or substantially H-shaped or substantially U-shaped or substantially B-shaped or substantially I-shaped planar shape is formed by cutting to a depth that does not reach the column or beam.
Insert each shear key into each kerf and fix it with a solidifying material.
A seismic reinforcement method for existing buildings .

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