Structure

Abstract

To provide a structure allowing improvement of workability and reduction of a construction period.SOLUTION: A structure comprises: precast concrete column members 4 placed in two layers; precast concrete beam members 5 place over two spans; two connect part 62 (pin connect part) connecting the column member 4 and the beam member 5 with pins. End parts 4a and 4b of the column member 4 in a length direction are connected to a center part 5c of the beam member 5 in a length direction, end parts 5a and 5b of the beam member in the length direction are connected to a central part 4c of the column member 4 in a length direction; a first connection part 61 between the end parts 4a and 4b of the column member 4 in the length direction and a center 5c of the beam member 5 in the length direction are rigidly connected, and the second part 62 between the end parts 5a and 5b of the beam member 5 in the length direction and the center part 4c of the column member 4 in a length direction are connected with a pin.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a structure.

Background Art

[0002] In high-rise buildings using precast structures, the allocation of the same precast members is planned for each floor. In such high-rise buildings, since construction is carried out for each floor, it is necessary to install sufficient temporary members to support the precast members before injecting grout material between the precast members to be joined to each other. Further, even in the case of full precast members, there may be a portion where in-situ concrete construction is required, and the in-situ concrete construction may become a critical point in the process.

[0003] On the other hand, in recent years, a construction method has also been known in which column members having a precast structure over a plurality of floors and beam members having a precast structure over a plurality of spans are adopted for structures such as high-rise buildings (see, for example, Patent Document 1). In such a construction method, the number of members can be reduced, the weight quantity is reduced, and the workability is good.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the structure disclosed in Patent Document 1, since all the joints between the column members and the beam members are rigid joints, there is a risk of affecting the workability and the construction period.

[0006] An object of the present invention is to provide a structure capable of improving workability and shortening the construction period.

Means for Solving the Problems

[0007] In order to achieve the above object, a structure according to the present invention includes a column member made of precast concrete arranged over two layers, a beam member made of precast concrete arranged over two spans, and a pin joint that pin-joints the column member and the beam member.

[0008] In the present invention, by having a pin joint that pin-joints the column member and the beam member, even if the column member extends over two layers and the beam member extends over two spans, compared to a structure in which the joint between the column member and the beam member is only a rigid joint, a simpler configuration can be achieved, thereby improving constructability and shortening the construction period.

[0009] Further, in the structure according to the present invention, an end portion in the length direction of the column member is joined to a central portion in the length direction of the beam member, an end portion in the length direction of the beam member is joined to a central portion in the length direction of the column member, a first joint between the end portion in the length direction of the column member and the central portion in the length direction of the beam member is rigidly joined, and a second joint between the end portion in the length direction of the beam member and the central portion in the length direction of the column member may be the pin joint.

[0010] By adopting such a configuration, the structure can be a combination of a rigid joint and a pin joint. Then, by rigidly joining the first joint between the end portion in the length direction of the column member and the central portion in the length direction of the beam member, and making the second joint between the end portion in the length direction of the beam member and the central portion in the length direction of the column member a pin joint, a simpler configuration than the first joint can be achieved, thereby improving constructability and shortening the construction period. Further, since the beam member is joined to the central portion in the length direction of the column member and the column member is joined to the central portion in the length direction of the beam member, construction can be carried out in a stable state even during the building construction. Also, in-situ concrete can be eliminated, and the construction period can be shortened.

[0011] Further, in the structure according to the present invention, the second joint may be such that an end portion in the length direction of the beam member is joined to a steel corbel provided at the central portion in the length direction of the column member.

[0012] By adopting such a configuration, the second joint can have a simpler structure, thus further improving the workability and shortening the construction period.

[0013] In addition, in the structure according to the present invention, the structure has a core seismic-resistant element disposed at the central portion in plan view and an outer peripheral frame disposed at the outer peripheral portion in plan view. The core seismic-resistant element is configured to bear seismic forces, and the outer peripheral frame may be configured to have the column members and the beam members.

[0014] By adopting such a configuration, the load borne by the outer peripheral frame can be reduced, and even in a structure where rigid joints and pin joints are mixed, the necessary rigidity and load-bearing capacity can be ensured. In addition, the cross-sectional shapes of the column members and the beam members can be reduced, and even for column members and beam members of two layers or two spans, weight reduction can be achieved. Also, by making the column members and the beam members have approximately the same length and weight, the hoisting plan can be simplified. The core seismic-resistant element refers to an element provided to enhance rigidity and load-bearing capacity, such as an RC core wall or a steel brace.

Advantages of the Invention

[0015] According to the present invention, the workability can be improved and the construction period can be shortened.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0017] Hereinafter, the structure according to the embodiment of the present invention will be described with reference to FIGS. 1-8. The structure 1 according to the present embodiment shown in FIG. 1 is a high-rise building using a precast structure. The planar shape of the structure 1 is rectangular. The direction along the sides of this rectangle is defined as the X direction (the direction of arrow X in the figure) and the Y direction (the direction of arrow Y in the figure). In the present embodiment, each floor of the structure 1 is designed to have the same height (story height).

[0018] The structure 1 has a core wall 2 (core seismic element) arranged at the central portion in plan view when viewed from above and below, and an outer peripheral frame 3 arranged at the outer peripheral portion in plan view. The core wall 2 is set to have higher rigidity than the outer peripheral frame 3 and is provided as a core seismic element. The core wall 2 is configured to bear almost all of the seismic force acting on the entire structure 1. The outer peripheral frame 3 bears the vertical force acting on the outer peripheral frame 3 and is configured to bear almost no seismic force. The core wall 2 is formed in a rectangular frame shape with sides extending in the X direction and the Y direction in plan view. Inside the core wall 2, for example, the core part of the structure 1 is arranged, and outside the core wall 2, for example, living rooms are arranged.

[0019] The outer peripheral frame 3 is formed in a rectangular frame shape with sides extending in the X direction and the Y direction in a plan view. As shown in FIGS. 2 and 3, the outer peripheral frame 3 is constructed by joining a plurality of precast concrete column members 4 and a plurality of precast concrete beam members 5. One column member 4 is formed to have a length of two stories (two floors) and is installed over two floors. The column members 4 are arranged in the same span. One beam member 5 is formed to have a length of two spans and is arranged over two spans.

[0020] The column members 4 adjacent in the X direction or the Y direction are arranged at different heights for one floor (one floor). That is, the column member 4A arranged over the nth floor and the n + 1st floor and the column member 4B arranged over the n + 1st floor and the n + 2nd floor are arranged alternately in the horizontal direction. Note that adjacent to the column member 4A arranged over the nth floor and the n + 1st floor, there is also arranged a column member 4A located below the column member 4B arranged over the n + 1st floor and the n + 2nd floor, that is, a column member 4C arranged over the n - 1st floor and the nth floor. In FIG. 3, the column members 4 arranged above and below the column member 4A arranged over the nth floor and the n + 1st floor are omitted. Thus, the column members 4 arranged in the X direction and the Y direction are arranged at the same height every other one. Adjacent column members 4 are arranged such that the central portion 4c in the height direction of one column member 4 and the height of the upper end portion 4a or the lower end portion 4b of the other column member 4 are at the same height.

[0021] Here, one column member 4A arranged over the nth floor and the n + 1st floor is defined as the first column member 41, the column member 4B arranged over the n + 1st floor and the n + 2nd floor adjacent to one side in the X direction of the first column member 41 is defined as the second column member 42, the column member 4C arranged below the second column member 42 and over the n - 1st floor and the nth floor is defined as the third column member 43, and the column member 4A arranged over the nth floor and the n + 1st floor adjacent to one side in the X direction of the second column member 42 and the third column member 43 is defined as the fourth column member 44.

[0022] The beam member 5 is installed between the central portions 4c in the height direction of the two column members 4 disposed with one column member 4 interposed therebetween. For example, for the beam member 5A installed between the first column member 41 and the fourth column member 44, one end 5a in the X direction is joined to the central portion 41c in the height direction of the first column member 41, and the other end 5b in the X direction is joined to the central portion 44c in the height direction of the fourth column member 44. At the central portion 5c of the beam member 5A in the X direction, the lower end portion 42b of the second column member 42 is joined above, and the upper end portion 43a of the third column member 43 is joined below.

[0023] In this way, the upper end portion 4a and the lower end portion 4b of the column member 4 are joined to the central portion 5c in the length direction of the beam member 5. The upper end portion 4a of the column member 4 is joined from below to the central portion 5c in the length direction of the beam member 5, and the lower end portion 4b of the column member 4 is joined from above to the central portion 5c in the length direction of the beam member 5. The end portions 5a, 5b in the length direction of the beam member 5 are joined to the central portion 4c in the height direction of the column member 4.

[0024] The joint between the upper end portion 4a of the column member 4 and the central portion 5c in the length direction of the beam member 5, and the joint between the lower end portion 4b of the column member 4 and the central portion 5c in the length direction of the beam member 5 are defined as the first joints 61, and the joints between the end portions 5a, 5b in the length direction of the beam member 5 and the central portion 4c in the height direction of the column member 4 are defined as the second joints 62.

[0025] The first joint 61 is joined by a mechanical joint. As shown in FIGS. 4 and 5, for the first joint 61, the reinforcing bars 51 protruding upward from the central portion 5c in the length direction of the beam member 5 are inserted into the holes 45 formed in the lower end portion 4b of the column member 4 joined above the beam member 5, and the reinforcing bars 51 protruding downward from the central portion 5c in the length direction of the beam member 5 are inserted into the holes 45 formed in the upper end portion 4a of the column member 4 joined below the beam member 5, and the holes 45 are filled with grout material. The first joint 61 is a joint by rigid joint. In FIG. 5, the reinforcing bars of the column member 4 and the beam member 5 are omitted.

[0026] The second joint portion 62 is bolted. As shown in FIGS. 4 and 6, the ends 5a, 5b of the beam member 5 are bolted to the steel bracket 7 that protrudes laterally from the central portion 4c in the height direction of the column member 4 at the second joint portion 62. The second joint portion 62 is a joint portion by pin joint. In FIG. 6, the steel bars of the column member 4 and the beam member 5 are omitted.

[0027] The steel bracket 7 has a fixing portion 71 fixed to the column member 4 and a protruding portion 72 protruding horizontally from the fixing portion 71. The fixing portion 71 is formed in a flat plate shape and is arranged along the circumferential surface of the column member 4. In the present embodiment, steel brackets 7 are provided on both sides sandwiching the column member 4. The steel brackets 7, 7 arranged on both sides of the column member 4 are fixed to the column member 4 by PC steel bars 73 passing through the column member 4, with their respective fixing portions 71. The steel brackets 7, 7 are prestressed by the PC steel bars 73 and given local flexural strength.

[0028] In the present embodiment, the protruding portion 72 is a T-shaped steel. The protruding portion 72 is arranged in a direction such that its axial direction is the direction protruding from the fixing portion 71. The protruding portion 72 is arranged in a direction where the flange 721 is above the web 722. A hole portion 723 through which a bolt 74 is inserted is formed in the flange 721. Female threads 52 opening downward are provided at the ends 5a, 5b of the beam member 5. The female threads 52 at the ends 5a, 5b of the beam member 5 are arranged above the hole portion 723 of the flange 721 of the protruding portion 72 of the steel bracket 7, and the beam member 5 is joined to the central portion 4c in the height direction of the column member 4 by the bolt 74 inserted through the hole portion 723 of the flange 721 from below and fastened to the female threads 52.

[0029] Since the outer peripheral frame 3 has the upper end portion 4a and the lower end portion 4b of the column member 4 joined to the central portion 5c of the beam member 5 and the ends 5a, 5b of the beam member 5 joined to the central portion 4c of the column member 4, the first joint portion 61 and the second joint portion 62 are alternately arranged in the vertical direction and the horizontal directions (X direction, Y direction). That is, the first joint portion 61 and the second joint portion 62 are arranged in a staggered pattern.

[0030] In this embodiment, a protruding portion 46 that protrudes toward the inner side of the outer peripheral frame 3 in plan view is provided at the central portion 4c in the length direction of the column member 4. Further, a protruding portion 52 that protrudes toward the inner side of the outer peripheral frame 3 in plan view is provided at the central portion 5c in the length direction of the beam member 5. These protruding portions 46 and 52 are provided to receive the beam member 81 provided inside the outer peripheral frame 3. The beam member 81 provided inside the outer peripheral frame 3 is joined to the protruding portions 46 and 52.

[0031] Next, the operation and effects of the structure 1 according to the above-described embodiment will be described. In the structure 1 according to the above-described embodiment, there is a second joint portion 62 (pin joint portion) that pin-joints the column member 4 and the beam member 5. Thereby, even if the column member 4 has a length over two layers and the beam member 5 has a length over two spans, compared with a structure in which the joint between the column member 4 and the beam member 5 is only a rigid joint, by adopting a simple configuration, it is possible to improve constructability and shorten the construction period.

[0032] Further, in the structure 1 according to the above-described embodiment, the first joint portion 61 between the end portions 4a and 4b of the column member 4 and the central portion 5c in the length direction of the beam member 5 is a rigid joint, and the second joint portion 62 between the end portions 5a and 5b in the length direction of the beam member 5 and the central portion 4c in the length direction of the column member 4 is a pin joint. Since it is possible to adopt a structure in which a rigid joint and a pin joint are combined in this way, by making the second joint portion 62 of the pin joint portion have a simpler configuration than the first joint portion 61 of the rigid joint portion, it is possible to improve constructability and shorten the construction period.

[0033] Further, in the structure 1 according to the above-described embodiment, since the beam member 5 is joined to the central portion 4c in the length direction of the column member 4 and the column member 4 is joined to the central portion 5c in the length direction of the beam member 5, there are column members 4 fixed at every other position also during construction, so that construction can be carried out in a stable state. Further, since a horizontal reinforcing bar mechanical joint is not required, in-situ concrete can be eliminated, and the construction period can be shortened.

[0034] In addition, in the structure 1 according to the above-described embodiment, the second joint portion 62 joins the end portions 5a and 5b in the length direction of the beam member 5 to the steel corbel 7 provided at the central portion 4c in the length direction of the column member 4. By adopting such a configuration, the second joint portion 62 can be made simpler, and thus the workability can be further improved and the construction period can be shortened.

[0035] In addition, in the structure 1 according to the above-described embodiment, the core wall 2 is configured to bear almost all of the seismic force acting on the entire structure 1. The outer peripheral frame 3 bears the vertical force acting on the outer peripheral frame 3 and is configured to bear almost no seismic force. By adopting such a configuration, the load borne by the outer peripheral frame 3 can be reduced, and even if the outer peripheral frame 3 has a structure in which rigid joints and pin joints are mixed, the necessary rigidity and strength can be ensured. In addition, the cross-sectional shapes of the column member 4 and the beam member 5 can be reduced, and even if the column member 4 and the beam member 5 are for two floors or two spans, the weight can be reduced. Also, by making the column member 4 and the beam member 5 have the same length and weight, the weight plan can be simplified.

[0036] In addition, in the present embodiment, the core wall 2 bears the seismic force of the entire structure 1, and the outer peripheral frame 3 is designed to bear almost only the vertical force. The outer peripheral frame 3 is connected to the beam member 81 provided inside the outer peripheral frame 3, but is not directly connected to the floor slab 83. Thereby, the height of the beam member 5 of the outer peripheral frame 3 can be set to an arbitrary height without considering the height of the floor slab 83. For example, as shown in FIG. 7, the height of the beam member 5 from the floor slab 83 can be arbitrarily set so that the beam member 5 of the outer peripheral frame 3 can be used as a eaves 82 for shielding the solar radiation 84 inserted into the interior of the structure.

[0037] As described above, the embodiment of the structure 1 according to the present invention has been described. However, the present invention is not limited to the above-described embodiment and can be appropriately changed without departing from the gist thereof. For example, in the above embodiment, the second joint portion 62 has the end portions 5a and 5b in the length direction of the beam member 5 joined to the steel frame corbel 7 provided at the central portion 4c in the height direction of the column member 4. On the other hand, as shown in FIG. 8, a column-side steel frame 91 is provided so as to project from the central portion 4c in the height direction of the column member 4, and a beam-side steel frame 92 is provided so as to project from the end portion 5a in the length direction of the beam member 5, and the column-side steel frame 91 and the beam-side steel frame 92 are joined through a gusset plate (not shown) so that the end portion 5a in the length direction of the beam member 5 is joined to the central portion 4c in the height direction of the column member 4.

[0038] Further, in the above embodiment, the core wall 2 is arranged as a core seismic element at the central portion in the plan view of the structure 1. The core wall 2 is set to have higher rigidity than the outer peripheral frame 3 and is provided as a core seismic element. On the other hand, a member having high rigidity such as a steel brace may be provided as a core seismic element at the central portion in the plan view of the structure 1.

[0039] Further, in the above embodiment, the core wall 2 is configured to bear almost all of the seismic forces acting on the entire structure 1. And the outer peripheral frame 3 is composed of the column member 4 and the beam member 5 of the present invention. On the other hand, the core wall 2 may not be provided at the central portion in the plan view of the structure 1. Also, the outer peripheral frame 3 may be configured to bear the seismic forces. Also, not only the outer peripheral frame 3 on the outer peripheral portion of the structure 1 but also the inside of the outer peripheral frame 3 may be composed of the column member 4 and the beam member 5 of the present invention, or any region of the structure 1 may be composed of the column member 4 and the beam member 5 of the present invention.

Explanation of Reference Numerals

[0040] 1 Structure 2 Core wall 3 Outer peripheral frame 4 Column member 4a Upper end portion (end portion) 4b Lower end portion (end portion) 4c, 41c, 44c Central portion 5 Beam member 5a End portion 5b end 5c central part 7 steel frame corbel 61 first joint 62 second joint (pin joint)

Claims

1. A precast concrete column member arranged over two layers, and a precast concrete beam member arranged over two spans, a pin joint portion for pin-joining the column member and the beam member, wherein an end portion in the longitudinal direction of the column member is joined to a central portion in the longitudinal direction of the beam member, an end portion in the longitudinal direction of the beam member is joined to a central portion in the longitudinal direction of the column member, a first joint portion between the end portion in the longitudinal direction of the column member and the central portion in the longitudinal direction of the beam member is rigidly joined, a second joint portion between the end portion in the longitudinal direction of the beam member and the central portion in the longitudinal direction of the column member is the pin joint portion, the second joint portion is a structure in which an end portion in the longitudinal direction of the beam member is joined to a corbel provided at a central portion in the longitudinal direction of the column member.

2. A precast concrete column member arranged over two layers, and a precast concrete beam member arranged over two spans, a pin joint portion for pin-joining the column member and the beam member, a core seismic-resistant element arranged at a central portion in plan view, an outer peripheral frame arranged at an outer peripheral portion in plan view, wherein the core seismic-resistant element is configured to bear seismic force, the outer peripheral frame has the column member and the beam member.

3. wherein an end portion in the longitudinal direction of the column member is joined to a central portion in the longitudinal direction of the beam member, an end portion in the longitudinal direction of the beam member is joined to a central portion in the longitudinal direction of the column member, a first joint portion between the end portion in the longitudinal direction of the column member and the central portion in the longitudinal direction of the beam member is rigidly joined, the structure according to Claim 2, wherein a second joint portion between the end portion in the longitudinal direction of the beam member and the central portion in the longitudinal direction of the column member is the pin joint portion.

4. The structure according to Claim 3, wherein the second joint portion is a structure in which an end portion in the longitudinal direction of the beam member is joined to a corbel provided at a central portion in the longitudinal direction of the column member.

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