Cantilevered frame

Abstract

To provide a technology enabling the realization of a space within a building where no beam profile of a buckstay is visible, by omitting the buckstay provided on the opposite side to an extension side of a joint location of a cantilever beam in a peripheral beam, in a cantilevered frame extending to the outside of the building from a location positioned at an intermediate point of the peripheral beam in plan view of a main frame of the building.SOLUTION: A cantilevered frame comprises: upper and lower cantilever beams 21C and 21A extending to the outside of the building from the respective intermediate points of peripheral beams 13 on upper and lower sides of a main frame 1; and a cantilever wall 22 integrally formed with the upper and lower cantilever beams 21C and 21A between the upper and lower cantilever beams 21C and 21A. The upper cantilever beam 21C is anchored to a floor slab S constructed on the building interior side of the upper peripheral beam 13 in the main frame 1 via connecting reinforcement 5.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a spring-loaded frame that springs outward from a location located in the middle of a perimeter beam in a plan view of the main frame of a building. [Background technology]

[0002] Patent document 1 discloses a protruding frame (a vertical structural surface of a part of a cantilever frame 20A) that protrudes outward from a point located in the middle of the outer perimeter beam (6) in a plan view of the main frame (10A) of a building.

[0003] This cantilever frame is provided with upper and lower cantilever beams (26C, 23B) that cantilever outward from the middle of the upper and lower outer perimeter beams of the main frame. With this structure, large bending stresses are applied from the upper and lower protruding beams to the joints between the outer periphery beam (6) and the protruding beams, causing torsional deformation of the outer periphery beam. Therefore, in this cantilever frame, in order to cope with the large bending stress from the cantilever beam, a bracing beam is provided on the opposite side of the cantilevered side of the joint of the cantilever beam in the outer perimeter beam. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-044509 Summary of the Invention [Problem to be solved by the invention]

[0005] However, if a bracing beam is provided on the opposite side of the protruding side of the joint of the protruding beam in the outer perimeter beam, the beam shape of the bracing beam will appear in the internal space of the main frame.

[0006] In view of this situation, the main objective of the present invention is to provide a technology that can realize a space inside a building in which the beam shape of a bracing beam is not visible by omitting the bracing beam that is provided on the opposite side of the protruding side of the joint of the protruding beam on the outer perimeter beam in a protruding frame that protrudes outward from a point located in the middle of the outer perimeter beam when viewed in plan in the main frame of the building. [Means for solving the problem]

[0007] The first characteristic configuration of the present invention is a spring-loaded frame that springs outward from a location located in the middle of the outer perimeter beam in a plan view of the main frame of the building, Upper and lower spring beams springing outward from the middle portions of the upper and lower outer perimeter beams of the main frame; a spring wall formed integrally with the upper and lower spring beams between the upper and lower spring beams; The upper protruding beam is fixed to a floor slab constructed on the inside of the building of the upper outer perimeter beam of the main frame via connecting bars.

[0008] According to this configuration, the upper and lower protruding beams and protruding walls that protrude outward from the middle of the upper and lower perimeter beams of the main frame are integrated with each other to form a beam-wall integrated structure with a large height and high bending rigidity, with a height corresponding to at least the height of the main frame. This beam-wall integrated structure is supported by the main frame with its upper end supported in tension by the positions of the upper perimeter beams of the main frame and its lower end supported by the positions of the lower perimeter beams of the main frame, thereby preventing large bending stresses that would cause torsional deformation from acting individually on the upper and lower perimeter beams.

[0009] At the upper end of the integrated beam-wall structure, which is supported in tension, the upper protruding beam is fixed via connecting bars to the floor slab constructed on the inside of the upper perimeter beam of the main frame, so the floor slab can be used as a tensile support via connecting bars, thereby properly supporting the upper end of the integrated beam-wall structure.Furthermore, at the lower end of the integrated beam-wall structure, which is supported in support, the floor slab can be used as a support without connecting bars because it is on the compression side, and the lower end of the integrated beam-wall structure can be properly supported in support at the location of the lower perimeter beam of the main frame by using the floor slab as a support.

[0010] By properly supporting the integrated beam-wall structure with the main frame in this way, it is possible to omit the bracing beams that are installed on the opposite side of the protruding side of the joint of the protruding beams in the outer beams, thereby creating a space inside the building where the beam shape of the bracing beams is not visible. It also becomes possible to omit the foundation that bears the vertical load on the outer periphery of the building where the beam-wall integrated structure is located, which in turn makes it possible to reduce the amount of excavation required and the number of structural members required.

[0011] The second characteristic feature of the present invention is that the lower protruding beam is fixed via connecting reinforcement to a floor slab constructed on the inside side of the building of the lower outer peripheral beam of the main frame.

[0012] With this configuration, the lower protruding beams are also fixed to the floor slab, which is constructed on the inside of the building of the lower outer perimeter beam of the main frame, via connecting bars. Therefore, even if the lower end of the integrated beam-wall structure is temporarily placed under tension due to a large earthquake force, the floor slab can be used as a tension support via the connecting bars, thereby properly supporting the lower end of the integrated beam-wall structure. This further improves the safety of the protruding frame.

[0013] A third characteristic feature of the present invention is that the protruding walls are provided in a continuous layer across a plurality of layers in the vertical direction.

[0014] According to this configuration, the protruding walls are arranged in succession across multiple floors in the vertical direction, so that the height dimension of the integrated beam and wall structure can be made large enough to correspond to multiple floors of the main frame, thereby making it possible to construct an integrated beam and wall structure with even higher bending rigidity.

[0015] The fourth characteristic feature of the present invention is that only the upper end reinforcement of the main reinforcement of the rebar of the reinforced concrete cantilever beam is extended toward the inside of the building as the connecting reinforcement and fixed to the floor slab.

[0016] Generally, the thickness of a floor slab is smaller than the depth of the beam, and the floor slab is located at a height corresponding to the upper end of the beam. Therefore, with this configuration, only the upper end reinforcement of the main reinforcement of the cantilever beam extends toward the inside of the building as a connecting reinforcement, and the connecting reinforcement can be rationally fixed to the floor slab located at a height corresponding to the upper end of the cantilever beam. [Brief explanation of the drawings]

[0017] [Figure 1] (A) Cross-section of the main part of the building, (B) Diagram showing the joint between the cantilever frame and the main frame [Figure 2] (A) Beam plan of the main floor of the building, (B) Foundation plan of the main part of the building DETAILED DESCRIPTION OF THE INVENTION

[0018] An embodiment of a building having a cantilever frame of the present invention will be described with reference to the drawings. 2(A) and (B), this building B is constructed, for example, of reinforced concrete and is equipped with a main frame 1 supported on an independent footing foundation K (an example of a foundation), and a cantilever frame 2 that cantilevers outward from the building from a location located in the middle (longitudinal middle) of the outer perimeter beam 13 in a plan view of the main frame 1. The cantilever frame 2 of the present invention is a frame that constitutes a vertical structural plane located on the outer lateral surface b1 of a protruding building portion b that cantilevers outward from a part of the outer periphery of building B in a plan view.

[0019] The main frame 1 is provided with perimeter columns 11 arranged at intervals along the perimeter of building B, and interior columns 12 arranged at intervals along the interior of building B. Furthermore, the main frame 1 is provided with perimeter beams (perimeter main girders) 13 arranged in an orientation along the perimeter of building B and connected to the perimeter columns 11, interior beams (interior main girders) 14 arranged inside building B and connected to the perimeter columns 11 or the interior columns 12, and minor beams 15 connected to the perimeter beams 13 or the interior beams 14.

[0020] As shown in FIG. 1(A), the cantilever frame 2 is provided with cantilever beams 21 that protrude outward from the middle of each of the outer periphery beams 13 of each story 31 to 33 of the main frame 1. In this embodiment, the protruding beams 21 include a third protruding beam 21C that protrudes outward from the middle of the outer periphery beam 13 of the third story 33, the uppermost in Figure 1(A), a second protruding beam 21B that protrudes outward from the middle of the outer periphery beam 13 of the second story 32, the second from the top, and a first protruding beam 21A (protruding foundation beam) that protrudes outward from the middle of the outer periphery beam 13 (foundation beam) of the first story 31, the lowest.

[0021] In addition, an upper spring-loaded wall 22B is provided between the third spring beam 21C and the second spring beam 21B, and is integral with both the spring beams 21C and 21B, and a lower spring-loaded wall 22A is provided between the second spring beam 21B and the first spring beam 21A, and is integral with both the spring beams 21B and 21A. The upper spring-loaded wall 22B and the lower spring-loaded wall 22A form a continuous spring-loaded wall 22 spanning multiple layers in the vertical direction. The continuous protruding walls 22A, 22B and the first to third protruding beams 21A to 21C constitute an integral beam-wall structure 4 that is tall and has high bending rigidity.

[0022] As shown in Figure 1(A), the integrated beam-wall structure 4 is supported by the main frame 1 in such a manner that its upper end is supported in tension at the location of the outer perimeter beam 13 on the third story 33 above the main frame 1, and its lower end is supported by the location of the outer perimeter beam 13 on the first story 31 below the main frame 1. In this embodiment, the protruding beams 21 of each story 31 to 33 of the integrated beam-wall structure 4 penetrate the outer perimeter beam 13 of the main frame 1 and are fixed via a plurality of connecting bars 5 to a reinforced concrete floor slab S constructed on the inside of the building from the outer perimeter beam 13.

[0023] Therefore, using the protruding wall 22 of the multi-story building as a reference, at least the third protruding beam 21C of the upper third story 33 and the first protruding beam 21A of the lower first story 31 are both fixed to the floor slab S constructed on the inside side of the building of the outer perimeter beams 13 of the upper third story 33 and the lower first story 31 via connecting reinforcement 5.

[0024] Therefore, at the upper end side of the beam-wall integrated structure 4, which is supported in tension, the floor slab S is used as a tension support via the connecting reinforcement 5, so that the upper end side of the beam-wall integrated structure 4 can be properly supported in tension. Furthermore, since the lower end of the beam-wall integrated structure 4 that is supported is on the compression side, the floor slab S can be used as a supporting support to properly support and support the lower end of the beam-wall integrated structure 4 even without the connecting reinforcement 5. However, even if the lower end of the beam-wall integrated structure 4 becomes on the tension side for a short period of time due to a large earthquake force, for example, the floor slab S can be used as a tensile support via the connecting reinforcement 5 to properly support and tensile the lower end of the beam-wall integrated structure 4.

[0025] By properly supporting the beam-wall integrated structure 4 with the main frame 1 in this way, it is possible to omit the bracing beam installed on the opposite side of the protruding side of the joint of the protruding beam 21 in the outer beam 13 of the main frame 1, and the beam shape of the bracing beam can be prevented from appearing inside the building B. Furthermore, as shown in Figure 2(B), the independent footing foundation K that bears vertical loads on the outer periphery of the building of the integrated beam-wall structure 4 can be omitted, which reduces the amount of excavation required and the number of structural members required.

[0026] As shown in FIG. 1(A), in this embodiment, in each of the floors 31 to 33, the floor slab S is configured to have a thickness dimension smaller than the beam depth of the spring beam 21, and is positioned at a height corresponding to the upper end side of the spring beam 21. 1(B), each of the cantilever beams 21 is made of reinforced concrete with main reinforcements (not shown) consisting of upper end reinforcement 21a and lower end reinforcement (not shown), and stirrup reinforcement (not shown) surrounding the upper end reinforcement 21a and lower end reinforcement. Of the main reinforcements of each cantilever beam 21, only the upper end reinforcement 21a extends toward the inside of the building as connecting reinforcement 5 and is fixed to the floor slab S. Therefore, the connecting bars 5 can be rationally fixed to the floor slab S that is placed at a height corresponding to the upper end side of the cantilever beam 21. The upper end bars 21a can be extended by making the upper end bars 21a themselves longer, or by connecting extension rebars to the upper end bars 21a with lap joints, mechanical joints, or the like.

[0027] [Another embodiment] Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied independently, but can also be applied in combination with the configurations of other embodiments.

[0028] (1) In the above-described embodiment, as shown in FIG. 1(A), the beam-wall integrated structure 4 is constituted by the continuous-story protruding walls 22A and 22B and the first to third protruding beams 21A to 21C. In contrast to this, an example has been shown in which the cantilever beams 21 of the cantilever frame 2 in each story 31 to 33 are fixed to the floor slab S constructed on the inside side of the building of the outer peripheral beams 13 of the main frame 1 via connecting bars 5, but it is also possible for only the third cantilever beam 21C of the upper third story 33, or only the third cantilever beam 21C of the upper third story 33 and the first cantilever beam 21C of the lower first story 31, or only the third cantilever beam 21C of the upper third story 33 and the second cantilever beam 21B of the second story 32 on the upper and lower central sides to be fixed to the floor slab S via connecting bars 5.

[0029] (2) In the above-described embodiment, as shown in FIG. 1(A), an example was shown in which the beam-wall integrated structure 4 is composed of three protruding beams 21 (21A to 21C) for two stories and two protruding walls 22 (22A, 22B) for the adjacent stories, but the beam-wall integrated structure 4 may also be composed of two protruding beams 21 and one protruding wall 22 for one story. For example, in Figure 1(A), the beam-wall integrated structure 4 may be composed of only two second and third spring beams 21C, 21B and one upper spring wall 22B, or the beam-wall integrated structure 4 may be composed of two first and second spring beams 21B, 21A and one lower spring wall 22A. In this case, using one protruding wall 22 as a reference, only one upper protruding beam 21, or two upper and lower protruding beams 21, can be fixed to the floor slab S constructed on the inside side of the building of the outer perimeter beam 13 of the main frame 1 via connecting reinforcement 5.

[0030] Furthermore, the beam-wall integrated structure 4 may be configured by four or more protruding beams 21 for three or more stories and three or more protruding walls 22 for each story. In this case, using three or more cantilever walls 22 as a reference, only the uppermost cantilever beam 21 or only the upper multiple cantilever beams 21 can be fixed via connecting bars 5 to the floor slab S constructed on the inside of the building of the perimeter beam 13 of the main frame 1. In addition to these, the lowermost cantilever beam 21 or multiple cantilever beams 21 on the lower side can also be fixed via connecting bars 5 to the floor slab S constructed on the inside of the building of the perimeter beam 13 of the main frame 1. In this way, an appropriate number of cantilever beams 21 can be fixed to the floor slab S via connecting bars 5 at appropriate locations in the vertical direction.

[0031] (3) In the above-described embodiment, the cantilever beam 21 is fixed to the floor slab S constructed on the inside of the building of the outer perimeter beam 13 of the main frame 1 via connecting bars 5, and an example is shown in which the upper end bars 21a of the cantilever beam 21 are extended to the inside of the building as connecting bars 5 and fixed to the floor slab S. However, for example, instead of using the main bars of the cantilever beam 21, connecting bars 5 separate from the main bars may be extended between the cantilever beam 21 and the floor slab S.

[0032] (4) In the above-described embodiment, building B is not limited to the reinforced concrete structure shown in the above-described embodiment, but various structures such as steel-reinforced concrete structure, steel pipe concrete structure, and a composite structure of these with steel structure can be adopted. [Explanation of symbols]

[0033] 1 Main body frame 2. Cantilever structure 5 Junction muscle 13 Perimeter beam 21 Cantilever beam 21A Cantilever beam 21B Cantilever beam 21C Cantilever beam 21a Top bar 22 Projection Wall 22A Projection Wall 22B Projection wall Building B S floor slab

Claims

1. A spring-loaded frame that springs outward from a point located in the middle of the outer perimeter beam in a plan view of the main frame of the building, Upper and lower spring beams springing outward from the middle portions of the upper and lower outer perimeter beams of the main frame; a spring wall formed integrally with the upper and lower spring beams between the upper and lower spring beams; A cantilever frame in which the upper cantilever beam is fixed via connecting bars to a floor slab constructed on the inside of the building of the upper outer perimeter beam of the main frame.

2. 2. A cantilever frame according to claim 1, wherein the lower cantilever beam is fixed to a floor slab constructed on the building interior side of the lower outer perimeter beam of the main frame via connecting bars.

3. 3. The cantilever frame according to claim 1, wherein the cantilever walls are provided in succession across a plurality of stories in the vertical direction.

4. 3. A cantilever frame according to claim 1 or 2, wherein only the upper end reinforcement of the main reinforcement of the cantilever beam of reinforced concrete construction is extended toward the inside of the building as the connecting reinforcement and fixed to the floor slab.

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