Reinforcement structure on outer perimeter of building

Abstract

To provide an external framework to attach a brace to an existing framework on an outer perimeter of a building where an overhanging beam protrudes from the sides of columns and beams.SOLUTION: A reinforcement structure 15 comprises an existing framework 70, an overhanging beam 50 that supports a slab 42 protruding from a side 32 of an existing column 20 and an existing beam 30 of the existing framework 70, an additionally placed beam 200 that is placed while embracing the overhanging beam 50 on the side 32 of the existing column 20 and the existing beam 30, and an external frame 100 in a rectangular frame shape to which a brace 102 is attached, the external frame being joined to the left and right existing columns 20 of the existing framework 70 and to the upper additionally placed beam 200, and being fixed to an anchor 254 with a head, the anchor being fixed to the lower additionally placed beam 200 and protruding from the slab 42.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a reinforcing structure for the outer periphery of a building.

Background Art

[0002] Patent Document 1 discloses a technique related to an improvement of an outer frame type seismic reinforcement structure in which a new reinforcing outer frame is constructed with precast prestressed concrete members outside an existing building and joined to the existing building with a shear force transmission member. In this prior art, an existing building is seismically reinforced by an outer frame assembled and configured with a plurality of precast concrete reinforcing column units and a plurality of precast concrete reinforcing beam units arranged outside the existing building by PC steel materials. Further, a precast concrete brace is incorporated in a part of the outer frame.

[0003] Patent Document 2 discloses a technique related to a joining structure of a seismic reinforcement frame column in which, when constructing a seismic reinforcement frame for seismic reinforcement of a main structure such as an existing or newly constructed concrete structure or steel frame structure outside the cross-section of the main structure in parallel to the cross-section of the main structure, at least one of the columns constituting the seismic reinforcement frame is joined to a column of the main structure with a distance therefrom. In this prior art, a boundary surface plate is overlapped and joined to the front surface on the seismic reinforcement frame side of the column of the main structure facing the lowermost column member of at least one of the plurality of columns of the seismic reinforcement frame, and the boundary surface plate is directly or indirectly joined to the lowermost column member, concrete is filled between the front surface of the column and the column member, and the joining portion of the boundary surface plate and the column member is embedded in the concrete.

[0004] Patent Document 3 discloses a technique related to a construction method of a seismic reinforcement frame. In this prior art, it includes a step of fixing a support member to the side surface of a floor lower than the installation floor of the seismic reinforcement frame on the outer wall of a floor above the ground floor of a building, and a step of placing the seismic reinforcement frame on the support member and fixing it to a predetermined part of the building.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0006] When a projecting beam that supports a slab such as a balcony or a corridor jumps out from the sides of columns and beams of an existing structure on the outer periphery of a building, an external frame to which a brace is attached cannot be joined to the side of the beam.

[0007] In view of the above facts, an object of the present invention is to provide an external frame for attaching a brace to an existing structure on the outer periphery of a building where a projecting beam jumps out from the sides of columns and beams.

Means for Solving the Problems

[0008] A first aspect is a reinforcing structure for the outer periphery of a building, comprising an existing structure on the outer periphery of the building, a projecting beam that supports a slab jumping out from the sides of existing columns and existing beams of the existing structure, a reinforced beam that is formed by encasing the projecting beam on the sides of the existing columns and the existing beams and is concreted in place, and an external frame that is joined to the left and right existing columns and the upper reinforced beam in the existing structure, is fixed to the lower reinforced beam, and is joined to a reinforced-beam-side anchor that protrudes from the slab and to which a brace is attached and has a rectangular frame shape.

[0009] In the reinforcing structure for the outer periphery of a building according to the first aspect, by joining a rectangular frame-shaped external frame to a reinforced beam that is formed by encasing a projecting beam on the sides of existing columns and existing beams and is concreted in place, and joining the external frame to a reinforced-beam-side anchor that is fixed to the reinforced beam and protrudes from the slab, an external frame for attaching a brace to an existing structure on the outer periphery of a building where a projecting beam jumps out from the side of an existing beam is provided.

[0010] The second aspect is the reinforcing structure of the outer periphery of the building according to the first aspect, which includes a main reinforcement bar of the additional cast beam arranged along the beam direction and fixed to the jumping-out beam at its tip, a shear reinforcement bar of the additional cast beam arranged around the main reinforcement bar of the additional cast beam and fixed to the existing beam at its tip, and an existing beam side anchor embedded in the additional cast beam and fixed to the existing beam at its tip.

[0011] In the reinforcing structure of the outer periphery of the building of the second aspect, the tip of the main reinforcement bar of the additional cast beam arranged in the additional cast beam is fixed to the jumping-out beam, the existing beam side anchor with the tip fixed to the existing beam is embedded in the additional cast beam, and the tip of the shear reinforcement bar of the additional cast beam arranged in the additional cast beam is fixed to the existing beam. Therefore, the degree of fixation between the additional cast beam and the existing beam is increased.

[0012] The third aspect is the reinforcing structure of the outer periphery of the building according to the first or second aspect, in which an additional cast column is cast on the side of the existing column, and the external frame is joined to the additional cast column.

[0013] In the reinforcing structure of the outer periphery of the building of the third aspect, the rigidity of the existing structure is increased by casting an additional cast column on the existing column.

Advantages of the Invention

[0014] According to the present invention, an external frame for attaching a brace can be provided to the existing structure of the outer periphery of a building where the jumping-out beam jumps out from the sides of the column and the beam.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Mode for Carrying Out the Invention

[0016] <First Embodiment> The reinforcement structure of the building outer peripheral portion will be described. In each figure, two orthogonal horizontal directions are defined as the X direction and the Y direction, and are indicated by arrow X and arrow Y respectively. The vertical direction orthogonal to the X direction and the Y direction is defined as the Z direction and is indicated by arrow Z.

[0017] Note that each drawing is only schematically shown. Also, the dimensions, ratios, etc. of each element shown in the drawings may not necessarily match the actual ones. Further, even between multiple drawings, the dimensions, ratios, numbers, etc. of each element may not necessarily match. In addition, in this embodiment, for configurations not directly related to the present invention and well-known configurations, etc., the description may be omitted or simplified. The same applies to the second embodiment described later.

[0018] [Reinforcement structure] The specific structure of the reinforcement structure for the outer periphery of the building in this embodiment will be described. As shown in FIG. 4, the reinforcement structure 15 of this embodiment includes an existing structure 70, a jump-out beam 50, an additional cast beam 200, and an external frame 100.

[0019] (Building and external frame) First, the building and the external frame to which the reinforcement structure of this embodiment is applied will be described. Note that the building and the external frame described here are examples and are not limited thereto.

[0020] As shown in FIG. 1, the existing building 10 of this embodiment is a reinforced concrete structure and is a building with a ramen structure configured to have existing columns 20 and existing beams 30, 31 (see also FIG. 2) joined between the existing columns 20. The building 10 of this embodiment is supported by piles 16. Specifically, each existing column 20 of the building 10 is fixed to a footing 14 constructed on the ground G, and each footing 14 is supported by a plurality of piles 16 constructed on the ground G. Note that the structure of the building 10 is an example and is not limited thereto.

[0021] As shown in FIG. 3, a small beam 33 along the Y direction is spanned between the existing beams 30 installed at intervals in the X direction. Note that in FIG. 3, the slabs 40 and 42 described later are not shown for easy understanding.

[0022] As shown in FIG. 2, a slab 40 is supported by existing beams 30, 31 and secondary beams 33 (see FIG. 3). Further, a projecting beam 50 projects from a side surface 32 of the existing beam 30 at the outer peripheral portion 12 (also see FIG. 1) of the building 10.

[0023] As shown in FIG. 3, the projecting beam 50 of the present embodiment projects from a side surface 22 of the joint portion between the existing beam 30 and the existing column 20 and a side surface 32 of the joint portion between the existing beam 30 and the secondary beam 33. Further, a tip secondary beam 51 is spanned between the tip ends of the projecting beam 50. In FIG. 1, the projecting beam 50, the tip secondary beam 51, etc. are not shown. Further, an outer wall made of reinforced concrete is provided in the existing structure 70, but is omitted in this description.

[0024] As shown in FIG. 2, the existing beams 30, the projecting beam 50 and the tip secondary beam 51 support a slab 42 that projects from the outer peripheral portion 12. A fence 44 is provided at the tip end of the slab 42. In the present embodiment, the slab 42 is used as an outer corridor, but is not limited thereto, and may be used as a balcony, for example. Further, in the present embodiment, the beam composition of the projecting beam 50 is smaller than that of the existing beam 30, but is not limited thereto.

[0025] Although not shown, reinforcing bars are respectively arranged in the existing beams 30, 31, the secondary beams 33, the projecting beam 50, the tip secondary beam 51, the existing column 20, the slabs 40, 42 and the fence 44 shown in FIGS. 2 and 3. Specifically, main beam bars and beam shear reinforcement bars are respectively arranged in the existing beams 30, 31, the secondary beams 33, the projecting beam 50 and the tip secondary beam 51. Main column bars and column shear reinforcement bars are arranged in the existing column 20. Lower end main bars, lower end force distribution bars, upper end main bars, upper end force distribution bars, etc. are arranged in the slabs 40 and 42. Vertical bars and horizontal bars are arranged in the fence 44. Since the arrangement of these reinforcing bars is common, as described above, the illustration is omitted.

[0026] As shown in Fig. 1, an external frame 100 is joined to some of the existing structures 70 on the outer periphery 12 of the building 10, and braces 102 are attached to the external frame 100 for seismic reinforcement. As shown in Fig. 4, the external frame 100 of this embodiment is a steel frame formed by joining H-shaped steels 80 having flange 82, flange 84 and web 86 in a rectangular frame shape. The brace 102 of this embodiment is a steel brace in which the H-shaped steel 80 (see Fig. 5 etc.) is arranged in a V shape, but is not limited thereto, and for example, a damping brace with a damper incorporated therein may be used. Note that the external frame 100 and the brace 102 in each figure are schematically illustrated as appropriate.

[0027] (Additional cast-in-place beam) Next, the additional cast-in-place beam will be described. In the figures, mainly the additional cast-in-place beam 200 above the existing structure 70 is illustrated and described, but the structure of the additional cast-in-place beam 200 below the existing structure 70 is the same. Also, in order to avoid making the figure complicated and to make it easier to understand, the hatching representing the cross section is not shown for the additional cast-in-place beam 200. Note that the structure of the additional cast-in-place beam 200 is an example and is not limited thereto.

[0028] As shown in Figs. 4 to 6, additional cast-in-place beams 200 for providing the external frame 100 are cast-in-place on the side surface 32 of the existing beam 30 of the existing structure 70 where the external frame 100 is provided. The additional cast-in-place beam 200 is cast-in-place while embracing the projecting beam 50. Note that Fig. 6, like Fig. 3, does not illustrate the slabs 40 and 42 in order to make it easier to understand.

[0029] As shown in Fig. 8, the additional cast-in-place beam 200 is reinforced with additional cast-in-place beam main reinforcements 210, 212 (see also Fig. 7) and additional cast-in-place beam shear reinforcement 220. The additional cast-in-place beam main reinforcements 210, 212 are arranged in a rectangular shape and are each arranged along the beam direction. Note that the additional cast-in-place beam main reinforcement 212 is arranged in the lowermost stage. The additional cast-in-place beam shear reinforcement 220 is arranged so as to surround the additional cast-in-place beam main reinforcements 210, 212 and is arranged at intervals in the beam direction.

[0030] As shown in FIG. 7, the bottommost additional beam main reinforcement 212 is arranged on the lower side of the protruding beam 50 in the additional beam 200. The tip portions 210A of the additional beam main reinforcements 210 other than the bottommost one are fixed to the protruding beam 50 by inserting them into holes drilled in the protruding beam 50 and filling them with an adhesive.

[0031] As shown in FIG. 8, the additional beam shear reinforcement 220 is composed of a horizontally U-shaped first reinforcement 224 and a second reinforcement 222 along the vertical direction. The second reinforcement 222 is arranged horizontally on the existing beam 30 side of the additional beam main reinforcements 210 and 212, and the upper and lower ends are bent and hung on the additional beam main reinforcements 210 and 212. The upper and lower tip portions 224A of the horizontally U-shaped first reinforcement 224 are fixed to the existing beam 30 by inserting them into holes drilled in the existing beam 30 and filling them with an adhesive.

[0032] Also, a headed anchor 250, which is an example of an existing beam side anchor, protrudes from the side surface 32 of the existing beam 30. A plurality of headed anchors 250 are provided at intervals in the beam direction. The headed anchor 250 is fixed to the existing beam 30 by inserting the tip portion 250A into a hole drilled in the existing beam 30 and filling it with an adhesive before the additional beam 200 is overcast. The additional beam 200 is overcast so that the headed anchor 250 protruding from the side surface 32 of the existing beam 30 is embedded.

[0033] As shown in FIG. 9, vertical bars 230 and bent bars 240 and 242 are respectively arranged on the outer and inner sides in the X direction of the protruding beam 50 at the end portion 202 of the additional beam 200. Although only the left end portion 202 is shown in FIG. 9, the right end portion 202 has the same structure except for being symmetric left and right (see FIG. 7). Also, in FIG. 9, the illustration of the additional beam main reinforcements 210 and 212 (see FIGS. 7 and 8) and the additional beam shear reinforcement 220 (see FIG. 8) is omitted.

[0034] The vertical bars 230 are arranged along the vertical direction at the end portion 202 of the additional beam 200, and a plurality of them are arranged at intervals in the Y direction. Although not shown, the upper end portions of the vertical bars 230 are fixed to the slab 42 (see FIG. 8) by inserting them into holes drilled in the slab 42 (see FIGS. 8 etc.) and filling them with an adhesive.

[0035] The bent bars 240 and 242 are respectively arranged in a plurality of numbers at intervals in the vertical direction in an L shape in plan view at the end 202 of the additional beam 200. One ends 240A and 242A of the bent bars 240 and 242 are fixed to the jump-out beam 50 by inserting them into the holes drilled in the jump-out beam 50 and filling with an adhesive. The other ends 240B and 242B of the bent bars 240 and 242 are fixed to the existing column 20 by inserting them into the holes drilled in the existing column 20 and filling with an adhesive. The bent bars 240 and 242 are each divided into two parts and connected by an overlapping joint so as to be insertable into the drilled holes.

[0036] (Outline of the joint between the external frame and the existing structure) Next, the outline of the joint between the external frame and the existing structure will be described.

[0037] As shown in FIG. 4, for the external frame 100, the left and right side edges 110 are joined to the side surfaces 22 of the left and right existing columns 20 (see also FIG. 6), the upper side edge 120 is joined to the lower surface 204 of the upper additional beam 200 (see also FIG. 5), and the lower side edge 130 is joined to a headed anchor 254 as an example of an additional beam side anchor protruding from the slab 42, thereby being substantially joined to the lower additional beam 200 (see also FIG. 5).

[0038] (Joint structure between the existing column and the side edge of the external frame) Next, the joint structure between the existing column and the side edge of the external frame will be described.

[0039] As shown in FIG. 10, a headed anchor 252 is fixed to the existing column 20 and protrudes from the side surface 22. The headed anchor 252 is fixed to the existing column 20 by inserting the tip 252A into the hole drilled in the existing column 20 and filling with an adhesive before installing the external frame 100. Further, a headed stud 152 is welded to the web 86 of the side edge 110 formed of the H-shaped steel 80 of the external frame 100. A filling material 112 such as grout is filled between the side edge 110 of the external frame 100, the existing column 20, and the side surface 22, and the headed stud 152 and the headed anchor 252 are embedded in the filling material 112.

[0040] In the filling material 112, a longitudinal main reinforcement 114 that functions as a crack prevention bar and a hoop bar 116 that surrounds the longitudinal main reinforcement 114 are arranged. The longitudinal main reinforcement 114 is arranged along the vertical direction, and the hoop bars 116 are arranged at intervals in the vertical direction.

[0041] (Joint structure between the upper additional cast-in-place beam and the upper side of the external frame)

[0042] Next, the joint structure between the upper additional cast-in-place beam and the upper side of the external frame will be described.

[0043] As shown in FIG. 8, headed studs 150 are welded to the flanges 82 of the upper side portion 120 formed by the H-shaped steel 80 of the external frame 100. By embedding the headed studs 150 of the external frame 100 and casting the additional cast-in-place beam 200, the headed studs 150 are fixed to the additional cast-in-place beam 200.

[0044] (Joint structure between the lower additional cast-in-place beam and the lower side of the external frame) Next, the joint structure between the lower additional cast-in-place beam and the lower side of the external frame will be described.

[0045] As shown in FIG. 11, a headed anchor 254, which is an example of an additional cast-in-place beam side anchor, is fixed to the additional cast-in-place beam 200 and protrudes from the upper surface of the slab 42. The headed anchor 254 is inserted by protruding the tip 254B into a hole drilled in the slab 42 before casting the additional cast-in-place beam 200, and the intermediate portion 254A is fixed to the slab 42 by filling grout after casting.

[0046] The additional cast-in-place beam 200 is cast so that the tip 254B of the headed anchor 254 protruding from the side surface 32 of the existing beam 30 is embedded. Note that after casting the additional cast-in-place beam 200, the intermediate portion 254A and the tip 254B may be inserted into the holes drilled in the slab 42 and the additional cast-in-place beam 200, and an adhesive may be filled so that the intermediate portion 254A is fixed to the slab 42 and the tip 254B is fixed to the additional cast-in-place beam 200.

[0047] A stud 153 with a head is welded to the flange 84 of the lower side portion 130 composed of the H-shaped steel 80 of the external frame 100. A filler material 113 such as grout is filled between the lower side portion 130 of the external frame 100 and the slab 42, and the stud 153 with a head and the anchor 254 with a head are embedded in the filler material 113.

[0048] In the filler material 113, horizontal main bars 115 that function as anti-splitting bars and hoop bars 117 that surround the horizontal main bars 115 are arranged. The horizontal main bars 115 are arranged along the X direction. The hoop bars 117 are arranged at intervals in the Y direction.

[0049] [Function] Next, the function of this embodiment will be described.

[0050] As shown in FIG. 4, the left and right side portions 110 of the rectangular frame-shaped external frame 100 to which the brace 102 is attached are joined to the existing columns 20 of the existing structure 70 (see also FIGS. 6 and 10). The upper side portion 120 of the external frame 100 is joined to the additional beam 200 that is formed by embedding the jump-out beam 50 in the side surface 32 of the existing beam 30 and performing additional casting (see also FIGS. 5 and 8). The lower side portion 130 of the external frame 100 is fixed to the additional beam 200 and joined to the anchor 254 with a head that protrudes from the slab 42 (see also FIGS. 5 and 11). Therefore, it is possible to provide the external frame 100 for attaching the brace 102 to the existing structure 70 at the outer peripheral portion 12 where the jump-out beam 50 jumps out from the side surface 32 of the existing beam 30.

[0051] Here, FIGS. 15(A) and 15(B) show an example of the joint structure of the external frame 100 when there is no jump-out beam 50. When there is no jump-out beam 50 in this way, the external frame 100 can be joined to the side surface 32 of the existing beam 30. However, as shown in FIGS. 15(C) and 15(D), when the jump-out beam 50 jumps out from the side surface 32 of the existing beam 30, the external frame 100 interferes with the jump-out beam 50, and the external frame 100 cannot be joined to the side surface 32 of the existing beam 30.

[0052] In contrast, in the present embodiment, as described above, by embedding the protruding beam 50 on the side surface 32 of the existing beam 30 and performing additional casting of the additional beam 200, an external frame 100 for attaching the brace 102 to the existing structure 70 of the outer peripheral portion 12 can be provided. Then, the seismic resistance of the building 10 is improved by the external frame 100 to which the brace 102 is attached.

[0053] Note that the axial force of the brace 102 acting on the external frame 100 is transmitted to the existing column 20 through the headed stud 152 welded to the side portion 110 and the headed anchor 252 fixed to the existing column 20 (see FIG. 10). It is transmitted to the existing beam 30 through the headed stud 150 welded to the upper side portion 120 and the headed anchor 250 fixed to the existing beam 30 (see FIG. 8). It is transmitted to the existing beam 30 through the headed stud 153 welded to the lower side portion 130, the headed anchor 254 fixed to the additional beam 200, and the headed anchor 250 fixed to the existing beam 30 (see FIG. 11).

[0054] Also, by performing additional casting of the additional beam 200 on the existing beam 30, the rigidity of the existing structure 70 is increased. Reinforcing bars 210 for the additional beam are arranged along the beam direction in the additional beam 200, and the tip portion 210A is inserted into a hole drilled in the protruding beam 50 and fixed to the protruding beam 50 by filling with an adhesive (see FIG. 7). Also, shear reinforcing bars 220 for the additional beam are arranged around the reinforcing bars 210 and 212 for the additional beam, and the tip portion 224A of the first reinforcing bar 224 constituting the shear reinforcing bars 220 for the additional beam is inserted into a hole drilled in the existing beam 30 and fixed to the existing beam 30 by filling with an adhesive (see FIG. 8). Also, headed anchors 250 fixed by inserting into holes drilled in the existing beam 30 and filling with an adhesive are embedded in the additional beam 200 (see FIG. 8).

[0055] Furthermore, vertical bars 230 and bent bars 240 and 242 are arranged at the end portion 202 of the additional beam 200. One end portions 240A and 242A are inserted into holes drilled in the protruding beam 50 and fixed to the protruding beam 50 by filling with an adhesive, and the other end portions 240B and 242B are inserted into holes drilled in the existing column 20 and fixed to the existing column 20 by filling with an adhesive (see FIG. 9).

[0056] Therefore, the additional beam 200 has a greater degree of fixation with the jump-out beam 50 and the existing beam 30, and is firmly integrated with the existing structure 70. As a result, the rigidity of the existing structure 70 increases, and the seismic resistance of the building 10 is improved.

[0057] In this way, the additional beam 200 has two functions: a function of enabling the provision of the external frame 100 to the existing structure 70, and a function of increasing the rigidity of the existing structure 70.

[0058] <Second Embodiment> Next, the reinforcement structure of the outer peripheral portion of the building in the second embodiment will be described. Note that the same members as those in the first embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

[0059] [Structure] The specific structure of the reinforcement structure of this embodiment will be described. As shown in FIG. 12, the reinforcement structure 17 of this embodiment includes an existing structure 70, a jump-out beam 50, an additional beam 200, an additional column 300, and an external frame 100.

[0060] (Building and External Frame) The existing building 10 and the external frame 100 to which the reinforcement structure of this embodiment is applied are the same as those in the first embodiment, and thus the description is omitted. Note that, precisely speaking, the external frame 100 is narrower in the left - right width than that in the first embodiment, but has the same configuration otherwise.

[0061] (Additional Beam) The additional beam is the same as that in the first embodiment, and thus the description is omitted. However, the vertical bars 230 at the end 202 of the additional beam 200 are not provided, and the main bars of the additional column 310 are used instead.

[0062] (Additional Column) Next, the additional cast-in-place column will be described. In the drawings, mainly the additional cast-in-place column 300 on the left side of the existing structure 70 will be illustrated and described. However, the structure of the additional cast-in-place column 300 on the right side is the same except that it is symmetric about the left and right. Also, to avoid making the drawings complicated and to make them easier to understand, hatching (diagonal lines) representing the cross-section is not shown for the additional cast-in-place column 300. Note that the structure of the additional cast-in-place column 30 is an example and is not limited to this.

[0063] As shown in FIGS. 12 and 13, on the side surface 32 of the existing beam 30 of the existing structure 70 provided with the external frame 100, an additional cast-in-place beam 200 for providing the external frame 100 is cast-in-place additionally. The additional cast-in-place beam 200 is cast-in-place additionally while embracing the projecting beam 50 (see also FIG. 5). Also, on the side surface 22 of the existing column 20, an additional cast-in-place column 300 for providing the external frame 100 is cast-in-place additionally. Note that FIG. 13 does not show the slabs 40 and 42 described later for easier understanding, similar to FIGS. 3 and 6.

[0064] As shown in FIG. 14, in the additional cast-in-place column 300, additional cast-in-place column main reinforcement bars 310 and additional cast-in-place column shear reinforcement bars 320 are arranged. The additional cast-in-place column main reinforcement bars 310 are arranged in a rectangular shape and are each arranged along the vertical direction.

[0065] The additional cast-in-place column shear reinforcement bars 320 are composed of a first reinforcement bar 324 in a U shape in plan view and a second reinforcement bar 322 along the X direction. The second reinforcement bar 322 is arranged horizontally on the existing column 20 side of the additional cast-in-place column main reinforcement bars 310, and the end portion in the Y direction is bent and hung on the additional cast-in-place column main reinforcement bars 310. The tip portion 324A of the first reinforcement bar 324 in a U shape in plan view is fixed to the existing column 20 by inserting it into a hole drilled in the existing column 20 and filling it with an adhesive.

[0066] In addition, headed anchors 350 project from the side surface 22 of the existing column 20. A plurality of headed stud anchors are provided at vertical intervals. The headed anchor 350 is fixed to the existing column 20 by inserting the tip 350A into the hole drilled in the existing column 20 and filling it with an adhesive before the additional column 300 is driven in. The additional column 300 is driven in so that the headed anchor 350 protruding from the side surface 22 of the existing column 20 is embedded therein.

[0067] (Outline of the joining of the external frame and the existing structure) Next, the outline of the joining of the external frame and the existing structure will be described.

[0068] As shown in FIG. 12, the external frame 100 is joined to the additional columns driven into the side surfaces 22 of the left and right existing columns 20 at the left and right side portions 110 (see also FIG. 13), the upper side portion 120 is joined to the lower surface 204 of the upper additional beam 200, and the lower side portion 130 is joined to the headed anchor 254 protruding from the slab 42, thereby being substantially joined to the lower additional beam 200.

[0069] (Joining structure between the additional column and the side portion of the external frame) Next, the joining structure between the existing beam and the side portion of the external frame will be described.

[0070] As shown in FIG. 14, headed studs 160 are welded to the flanges 82 of the side portion 110 of the external frame 100 formed of H-shaped steel 80. By driving the additional column 300 so that the headed studs 160 of the side portion 110 of the external frame 100 are embedded, the headed studs 160 are fixed to the additional column 300.

[0071] (Joining structure between the upper additional beam and the upper side portion of the external frame) Since it is the same as the first embodiment, the description is omitted.

[0072] (Joining structure between the lower additional beam and the lower side portion of the external frame) Since it is the same as the first embodiment, the description is omitted.

[0073] [Function] Next, the function of this embodiment will be described.

[0074] Similar to the function of the first embodiment, an external frame 100 can be provided to attach the brace 102 to the existing structure 70 of the outer peripheral portion 12 where the jumping beam 50 jumps out from the side surface 32 of the existing beam 30. Note that the axial force of the brace 102 acting on the external frame 100 is transmitted to the existing column 20 via the headed stud 160 welded to the side portion 110 and the headed anchor 350 fixed to the existing column 20 (see Fig. 14).

[0075] In addition, in this embodiment, since the additional column 300 is cast-in-place on the existing column 20, the rigidity of the existing structure 70 is further increased. The additional column main reinforcement 310 is arranged along the vertical direction in the additional column 300, and the upper end portion and the lower end portion are fixed to the slab 42 by inserting them into the holes drilled in the slab 42 and filling them with an adhesive. In addition, the additional column shear reinforcement 320 is arranged around the additional column main reinforcement 310 in the additional column 300, and the tip portion 324A of the first reinforcement 324 constituting the additional beam shear reinforcement 320 is fixed to the existing column 20 by inserting it into the hole drilled in the existing column 20 and filling it with an adhesive (see Fig. 14). Further, the headed anchor 350 fixed by inserting it into the hole drilled in the existing column 20 and filling it with an adhesive is embedded in the additional column 300 (see Fig. 14).

[0076] Therefore, the degree of fixation of the additional column 300 to the existing column 20 is increased, and it becomes firmly integrated with the existing structure 70, so the rigidity of the existing structure 70 is increased, and the seismic resistance of the building 10 is improved.

[0077] Thus, the additional column 300 has two functions: a function that enables the provision of the external frame 100 to the existing structure 70 and a function that increases the rigidity of the existing structure 70.

[0078] [Others] Note that the present invention is not limited to the above embodiment.

[0079] In the above-described embodiment, the external frame 100 and the brace 102 were made of H-shaped steel, but the present invention is not limited thereto, and they may be made of steel structural members other than H-shaped steel. Further, the brace 102 may be a vibration damping brace.

[0080] Also, the reinforcement arrangement of various reinforcing bars in the above-described embodiment is an example and is not limiting. Similarly, the configurations of various studs and anchors in the above-described embodiment are examples and are not limiting.

[0081] Furthermore, the present invention can be implemented in various modes without departing from the gist thereof. A plurality of embodiments can be implemented in combination as appropriate.

Explanation of Reference Numerals

[0082] 10 Building 12 Outer Periphery (Outer Periphery of Building) 15 Reinforcement Structure 17 Reinforcement Structure 20 Existing Column 22 Side 30 Existing Beam 32 Side 42 Slab 50 Protruding Beam 70 Existing Structure 100 External Frame 102 Brace 200 Additional Beam 210 Main Reinforcement of Additional Beam 220 Shear Reinforcement of Additional Beam 250 Headed Anchor (An Example of Anchor on Existing Beam Side) 254 Headed Anchor (An Example of Anchor on Additional Beam Side) 300 Additional Column

Claims

1. An existing structure on the outer periphery of a building, A projecting beam that supports a projecting slab by jumping out from the sides of existing columns and existing beams of the existing structure, A reinforced beam that is cast-in-place by embracing the projecting beam on the sides of the existing columns and the existing beams, A rectangular frame-shaped external frame that is joined to the left and right existing columns and the upper reinforced beam in the existing structure, fixed to the lower reinforced beam, and joined to a reinforced beam side anchor protruding from the slab, and to which braces are attached, A reinforcing structure for the outer periphery of a building comprising the above.

2. Main reinforcement bars for the reinforced beam that are arranged along the beam direction and whose tip ends are fixed to the projecting beam, Shear reinforcement bars for the reinforced beam that are arranged around the main reinforcement bars for the reinforced beam and whose tip ends are fixed to the existing beam, Existing beam side anchors that are embedded in the reinforced beam and whose tip ends are fixed to the existing beam, The reinforcing structure for the outer periphery of a building according to Claim 1, comprising the above.

3. A reinforced column is cast-in-place on the side of the existing column, The external frame is joined to the reinforced column, The reinforcing structure for the outer periphery of a building according to Claim 1 or Claim 2.

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