STRUCTURE FOR JOINING COLUMN AND BEAM FRAME AND SHEAR WALL

Abstract

In between a shear wall of a reinforced concrete structure disposed in a column and beam frame of a reinforced concrete structure and the frame, transmission capability of a shear force between is enhanced from a stage which a relative deformation occurs among between the frame and the shear wall. Plate is disposed between an inner peripheral surface of a frame and an outer peripheral surface of a shear wall, integrated with any one of the frame and the shear wall, and continuous in a longitudinal direction and in a height direction of the shear wall and penetrate the plate in a thickness direction. The anchors are dispersedly in the longitudinal direction and in the height direction of the shear wall.

Claims

1. A structure for joining a column and beam frame and a shear wall in which a shear wall and a frame are joined using a plurality of anchors, the shear wall being disposed in a structure plane of the frame of a column and a beam of a reinforced concrete structure, the shear wall being a reinforced concrete structure, the plurality of anchors being disposed in a longitudinal direction and a height direction along an outer peripheral surface of the shear wall, wherein one or a plurality of plates is disposed between an inner peripheral surface of the frame and the outer peripheral surface of the shear wall, integrated with any one of the frame and the shear wall, and continuous in each of the longitudinal direction and the height direction of the shear wall, the anchors are dispersedly disposed over a whole length in the longitudinal direction and a whole height in the height direction of the shear wall, and fixed to the frame and the shear wall in a state where the anchors penetrate the plate in a thickness direction and are locked to the plate in an in-plane direction, and the anchors each include a lock portion locked to the plate, and the anchor has a cross-sectional area perpendicular to an axis of the anchor at the lock portion larger than cross-sectional areas perpendicular to the axis at other portions of the anchor.

2. The structure for joining a column and beam frame and a shear wall according to claim 1, wherein the lock portion of the anchor is locked to any one of the frame and the shear wall together with the plate.

3. The structure for joining a column and beam frame and a shear wall according to claim 2, wherein a borehole is formed in any one of the frame and the shear wall from the plate side, a fitting portion that is inserted into the borehole and locked in the in-plane direction of the plate is formed to be continuous with the lock portion, and a fitting hole is formed to the plate side of the borehole, and the fitting hole is contactable with an outer peripheral surface of the fitting portion, and an inner peripheral surface of the fitting hole has a plane area perpendicular to an axial direction larger than a plane area perpendicular to the axial direction of an inner peripheral surface of the borehole.

4. The structure for joining a column and beam frame and a shear wall according to claim 3, wherein the plane area perpendicular to the axial direction of the inner peripheral surface of the fitting portion when the fitting portion is inserted into the fitting hole is equal to or larger than the plane area perpendicular to the axial direction of the inner peripheral surface of the borehole.

5. The structure for joining a column and beam frame and a shear wall according to claim 1, wherein the plate disposed in the longitudinal direction of the shear wall is discontinuous with the plate disposed in the height direction of the shear wall at a corner of the frame.

6. The structure for joining a column and beam frame and a shear wall according to claim 2, wherein the plate disposed in the longitudinal direction of the shear wall is discontinuous with the plate disposed in the height direction of the shear wall at a corner of the frame.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0053] FIG. 1A is an elevational view illustrating a state where a frame of a column and a beam is joined with a shear wall using plates and anchors;

[0054] FIG. 1B is a partially enlarged view of FIG. 1A;

[0055] FIG. 2A is a cross-sectional view taken along a line x-x of FIG. 1A;

[0056] FIG. 2B is a plan view of a part of the plate disposed on an upper surface of the beam in a lower floor side in FIG. 1A;

[0057] FIG. 3A is a partially enlarged view of FIG. 2A illustrating the anchor and the plate between the shear wall and the beam in the lower floor side of FIG. 1A in detail;

[0058] FIG. 3B is a cross-sectional view taken along a line y-y of FIG. 3A;

[0059] FIG. 3C is an enlarged view of FIG. 3A illustrating a relation between plane areas when a fitting hole having a plane area larger than a plane area of a borehole is continuously formed in a side close to the plate of the borehole;

[0060] FIG. 3D is an enlarged view of FIG. 3A illustrating a relation between the plane areas when the plane area of the fitting portion is equal to or more than the plane area of the borehole;

[0061] FIG. 4 is a cross-sectional view of FIG. 3A in a perpendicular direction; and

[0062] FIG. 5 is an elevational view illustrating a manufacturing example of the anchor when a lock portion is integrally formed with an anchor main body.

DETAILED DESCRIPTION

[0063] FIGS. 1A and 1B illustrate a specific example of a joining structure in which a shear wall 4 of a reinforced concrete structure is joined to a frame 1 using a plurality of anchors 5, the shear wall 4 is disposed in a structure plane of the frame 1 including a column 2 and a beam 3 of a reinforced concrete structure, and the plurality of anchors 5 is arranged in a longitudinal direction (horizontal direction) and a height direction (vertical direction) along an outer peripheral surface of the shear wall 4. The frame 1 may be an existing structure, or may be newly built together with the shear wall 4. The shear wall 4 is also an existing structure in some cases.

[0064] One or a plurality of plates (steel plates) 6 is disposed between an inner peripheral surface of the frame 1 and an outer peripheral surface of the shear wall 4. The plates (steel plates) 6 are integrated with any one of the frame 1 and the shear wall 4, and continuous in each of the longitudinal direction and the height direction of the shear wall 4. The plate 6 is disposed to be continuous including corners along a peripheral area of the shear wall 4 in some cases. However, to avoid a forcible deformation of the plate 6 positioned at the corner of the frame 1 when the frame 1 deforms in an in-plane direction of a structure plane and the like, it is appropriate that the plate 6 disposed in the longitudinal direction of the shear wall 4 is discontinuous with the plate 6 disposed in the height direction of the shear wall 4 at the corner of the frame 1 as illustrated in FIG. 1B (claim 4).

[0065] When the plates 6, 6 are discontinuous at the corner of the frame 1, a distance between the end portions of the plates 6, 6 in the two directions has any magnitude. In FIGS. 1A and 1B, an end portion in an axial direction of the plate 6 in the horizontal direction is apart from a surface in the shear wall 4 side of the column 2, and an end portion in an axial direction of the plate 6 in the vertical direction is apart from a surface in the shear wall 4 side of the beam 3. However, any one of the end portions is brought into contact with the inner peripheral surface of the frame 1 in some cases.

[0066] When the plurality of plates 6 is continuously disposed in the axial direction along the peripheral area of the shear wall 4, end surfaces in the axial direction of the mutually adjacent plates 6, 6 are mutually butted to be engaged in the axial direction. However, the plates 6, 6 are mutually engaged in a width direction to ensure a stability against deviation (relative movement) in the width direction in some cases.

[0067] The plate 6 includes anchoring devices 7, such as studs, disposed to protrude on any of both surfaces in a thickness direction, that is, any of a surface in the frame 1 side and a surface in the shear wall 4 side, and the anchoring devices 7 are buried in concrete of the frame 1 or the shear wall 4, thereby integrating the plate 6 with the frame 1 or the shear wall 4. The anchoring devices 7 are disposed to protrude at portions excluding the positions at which the anchors 5 penetrating the plates 6 are disposed. The anchoring device 7 may have any shape and any configuration.

[0068] FIG. 2B illustrates a planar surface of the plate 6 at a portion close to the column 2 of the beam 3 in a lower floor of FIG. 1A. Here, while the anchors 5 and the anchoring devices 7 are arranged at constant intervals in the axial direction of the plate 6, the anchors 5 and the anchoring devices 7 may be arranged in any state, and the anchors 5 and the anchoring devices 7 are both arranged in the width direction of the plate 6 in one case, or are arranged in a staggered pattern in another case.

[0069] The anchors 5 penetrate the plates 6 in the thickness directions, dispersedly disposed over the whole length in the longitudinal direction and the whole height in the height direction of the shear wall 4 in the state of being locked to the plates 6 in the in-plane direction, and fixed to the frame 1 and the shear wall 4. As illustrated in FIG. 3A to FIG. 5, the anchor 5 includes a lock portion 51 locked to the plate 6, and the lock portion 51 has a cross-sectional area perpendicular to an axis of the anchor 5 larger than cross-sectional areas perpendicular to the axis at the other portions of the anchor 5.

[0070] The lock portion 51 of the anchor 5 is inserted through an insertion hole 6a provided to the plate 6, and directly locked to an inner peripheral surface of the insertion hole 6a, or indirectly locked to the inner peripheral surface of the insertion hole 6a via a weld metal 61 welded around the lock portion 51 to integrate the lock portion 51 with the insertion hole 6a as illustrated in FIGS. 3A to 3D. The lock portion 51 is locked to the inner peripheral surface of the insertion hole 6a in the axial direction or in the axial direction and the width direction of the plate 6.

[0071] FIG. 1A and the following drawings illustrate an example in which tubular boreholes 1a are drilled in the concrete of the frame 1 from the inner peripheral surface (shear wall 4) side of the frame 1, and the plates 6 are disposed along the inner peripheral surface of the frame 1 when the frame 1 is an existing structure. The center of the insertion hole 6a of the plate 6 is matched with the center of the borehole 1a. The lock portion 51 is inserted into the insertion hole 6a of the plate 6, and the peripheral area of the lock portion 51 is welded, thereby filling a void between the inner peripheral surface of the insertion hole 6a and the lock portion 51.

[0072] In this case, a backing metal 62 is disposed around the insertion hole 6a on the frame 1 side (back surface side) of the plate 6, and a void provided to the back surface of the plate 6 for disposing the backing metal 62 is filled with a filler 8, such as mortar and an adhesive agent, for the stability of the plate 6 at normal times. A depressed portion to which the backing metal 62 is inserted is provided to the back surface of the plate 6 in some cases. FIG. 1A and the following drawings illustrate an example in which the shear wall 4 is newly built, and a section buried in the shear wall 4 of the anchor 5 is simply arranged in a space ensured in the shear wall 4 to be built. This space is ensured so as not to be interfered by main reinforcements 41, shear reinforcements, anchor reinforcements 42, and the like in two directions in the shear wall 4.

[0073] When the frame 1 is deformed, a shear force is transmitted to the plate 6 from the section buried in the frame 1 of the anchor 5 and the lock portion 51 locked to the plate 6. Here, especially when the lock portion 51 is welded to be integrated with the plate 6, the void between the lock portion 51 and the inner peripheral surface of the insertion hole 6a is completely filled. Therefore, plasticization hardly occurs due to reaction forces from the plate 6, which are alternately received by the lock portion 51 in positive and negative directions, when the shear force is transmitted to the shear wall 4 from the section buried in the shear wall 4 of the anchor 5 and the plate 6.

[0074] Hereinafter, a main body of the anchor 5 is referred to as a shaft portion 50 for convenience. When the anchor 5 has a configuration as illustrated in FIG. 5, a section excluding anchor members 53 described below is the shaft portion 50. In the configuration illustrated in FIGS. 3A to 3D and FIG. 4, actually, a section that projects to the frame 1 side and the shear wall 4 side from the insertion hole 6a of the plate 6 and is buried and fixed in the frame 1 and the shear wall 4 is the shaft portion 50.

[0075] As illustrated in FIG. 3A, ribs in any shape are formed by tapping a male screw, knotting, or the like in the section buried in the frame 1 and the section buried in the shear wall 4 of the shaft portion 50 to ensure a bonding strength with the filler 8 filled in the borehole 1a and a bonding strength with the concrete. When male screws are formed at the section buried in the frame 1 and the section buried in the shear wall 4 of the shaft portion 50, the lock portion 51 is tightened to the plate 6 with a nut 54 from the shear wall 4 side as the newly built side, thereby enhancing the integrity of the anchor 5 and the plate 6.

[0076] While the lock portion 51 is integrally formed as a part of the shaft portion 50 in the intermediate portion in the axial direction of the main body of the anchor 5 as illustrated in FIG. 5, the lock portion 51 is formed by coupling a tubular component as a separate body from the shaft portion 50 as illustrated in FIGS. 3A to 3D in some cases. In the case of the separate body, the lock portion 51 includes a fitting portion 52 that is formed to be continuous with the lock portion 51, inserted through the plate 6 to be fitted into any one of the frame 1 and the shear wall 4, and locked to any of the frame 1 and the shear wall 4. While FIG. 1A and the following drawings illustrate an example in which the fitting portion 52 is inserted into the tubular borehole 1a or space formed in the concrete of the frame 1, the fitting portion 52 is inserted into the concrete of the shear wall 4 in some cases. The borehole 1a is formed in the existing building frame, and the space is ensured in the newly built building frame.

[0077] The borehole 1a or the space is formed so as to have a depth corresponding to the section buried in the frame 1 or the shear wall 4 of the anchor 5 (shaft portion 50). A plane area in a direction perpendicular to the axial direction of the inner peripheral surface including an inner diameter of the borehole 1a or the like only needs to have a size enough to ensure a sufficient bonding strength with the shaft portion 50 when the filler 8, such as mortar, and the concrete are filled in the peripheral area of the shaft portion 50 excluding the lock portion 51. While the “plane area in the direction perpendicular to the axial direction of the inner peripheral surface” is obtained from the inner diameter when the borehole 1a and the like have circular cross-sectional surfaces, the borehole 1a and the like have cross-sectional shapes other than the circular shape in some cases.

[0078] In FIGS. 3A to 3D, when the frame 1 is an existing structure, and the fitting portion 52 is formed to be continuous with the lock portion 51, the borehole 1a into which the shaft portion 50 is inserted is provided to the frame 1 (column 2 and beam 3) from the plate 6 side, and a fitting hole 1b that the outer peripheral surface of the fitting portion 52 can contact is provided to the plate 6 side of the borehole 1a.

[0079] In this case, to ensure a certain stability against pulling out of the shaft portion 50 from the filler 8 in the section of the fitting portion 52, in FIG. 3C, the inner peripheral surface perpendicular to the axial direction including the inner diameter or the like of the fitting hole 1b has a plane area A2 larger than a plane area A1 of the inner peripheral surface perpendicular to the axial direction including the inner diameter or the like of the borehole 1a. Since the plane area A2 of the fitting hole 1b is larger than the plane area A1 of the borehole 1a (A2>A1), a situation where the peripheral area of the shaft portion 50 is surrounded by the filler 8 by approximately the same amount per unit length over the whole length of the section buried in the concrete (filler 8) of the shaft portion 50 regardless of the insertion of the fitting portion 52 into the fitting hole 1b can be obtained, thereby ensuring the stability against the pulling out of the shaft portion 50 of a certain degree or more.

[0080] FIG. 3D especially illustrates an example in which the inner peripheral surface perpendicular to the axial direction including the inner diameter or the like of the fitting portion 52 has a plane area A3 equal to or larger than the plane area A1 of the inner peripheral surface perpendicular to the axial direction including the inner diameter or the like of the borehole 1a. In this case, since the plane area A3 perpendicular to the axial direction of the inner peripheral surface of the fitting portion 52 is equal to or larger than the plane area A1 perpendicular to the axial direction of the inner peripheral surface of the borehole 1a (A3>A1), a situation where the peripheral area of the shaft portion 50 is surrounded by the filler 8 by the same amount or more per unit length over the whole length of the section buried in the concrete of the shaft portion 50 compared with the case of A3<A1 can be obtained, thus more improving the stability against the pulling out.

[0081] Additionally, in the case of FIG. 3D, with the plane area A3 of the inner peripheral surface of the fitting portion 52 equal to or larger than the plane area A1 of the inner peripheral surface of the borehole 1a (A3>A1), a projected area of the fitting portion 52 in a shear force acting direction is enlarged compared with the case of A3<A1, thus enhancing the shear force transmission effect by the enlarged amount. In this case, since the fitting portion 52 has a thickness, the plane area A2 perpendicular to the axial direction of the inner peripheral surface of the fitting hole 1b is larger than the plane area A1 perpendicular to the axial direction of the inner peripheral surface of the borehole 1a (A2>A1).

[0082] When the fitting hole 1b having the plane area A2 larger than the plane area A1 of the inner peripheral surface of the borehole 1a is not provided, and the plane area A1 of the borehole 1a is axially constant, the filler 8 filled in the peripheral area of the section close to the fitting portion 52 in the section buried in the frame 1 (concrete) of the shaft portion 50 is reduced in volume by the volume of the fitting portion 52 when the fitting portion 52 is fitted in the borehole 1a. Therefore, the bonding strength with the filler 8 is possibly reduced in the section. When the bonding strength with the filler 8 in the section buried in the frame 1 is not constant (uniform), a part with the low bonding strength is peeled off from the filler 8, and a situation of resisting the tensile force by the bonding strength of only the other parts possibly occurs.

[0083] In contrast, by providing the fitting hole 1b having the plane area A2 in the side close to the plate 6 of the borehole 1a such that the plane area A3 perpendicular to the axial direction of the inner peripheral surface of the fitting portion 52 is equal to or larger than the plane area A1 perpendicular to the axial direction of the inner peripheral surface of the borehole 1a, the peripheral area of the shaft portion 50 can be surrounded by the filler 8 by the same amount over the whole length of the section buried in the frame 1 of the shaft portion 50 regardless of the insertion of the fitting portion 52 into the fitting hole 1b. Therefore, the constant bonding strength is ensured over the whole length of the section buried in the frame 1, and an advantage of resisting the tensile force by the bonding strength over the whole length of the buried section is provided.

[0084] Since the tensile force in the axial direction acts over the whole length of the anchor 5 when the frame 1 is deformed (relatively deformed to the shear wall 4), to ensure the safety against pulling out due to the tensile force, anchor members 53, 53 fixed in the concrete are integrally disposed or coupled by screwing or the like at both end portions in the axial direction of the shaft portion 50.

[0085] FIG. 5 illustrates a manufacturing example of the anchor 5 with a simple configuration in which the lock portion 51 is integrally formed at the intermediate portion in the axial direction of the shaft portion 50, and an example of burying the anchor 5 in the frame 1 and the shear wall 4. In this example, since the lock portion 51 is inserted through the insertion hole 6a of the plate 6, and inserted into the frame 1 and the shear wall 4, it can be said that the lock portion 51 doubles as the fitting portion 52 in the example illustrated in FIGS. 3A to 3D.

DESCRIPTION OF REFERENCE SIGNS

[0086] 1 Frame [0087] 1a Borehole [0088] 1b Fitting hole [0089] 2 Column [0090] 3 Beam [0091] 4 Shear wall [0092] 41 Main reinforcement [0093] 42 Anchor reinforcement [0094] 5 Anchor [0095] 50 Shaft portion [0096] 51 Lock portion [0097] 52 Fitting portion [0098] 53 Anchor member [0099] 54 Nut [0100] 6 Plate [0101] 6a Insertion hole [0102] 61 Weld metal [0103] 62 Backing metal [0104] 7 Anchoring device (stud) [0105] 8 Filler