Construction method of structure

Abstract

To provide a construction method of a structure capable of suppressing collision between a core part and an outer frame structure during construction.SOLUTION: A construction method of a structure comprises constructing a core part 12 on an upper side of a lower frame structure 11, installing a lower base isolation layer 13 outside the core part 12, constructing an outer frame structure 14 on an upper side of the lower base isolation layer 13, and connecting an upper part of the core part 12 and an upper part of the outer frame structure 14 with a connecting member 20 made of a steel material when a height of the outer frame structure 14 reaches approximately 60 m, wherein the connecting member 20 is H-shaped steel.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for constructing a structure. [Background technology]

[0002] A seismic isolation structure is a system that reduces earthquake motion input by lengthening the natural period, while concentrating deformation in the seismic isolation layer to efficiently absorb earthquake energy. In recent years, seismic isolation structures with this type of structure have been adopted for a wide range of uses, including not only government buildings, hospitals, and headquarters facilities, but also tenant office buildings, apartment complexes, school buildings, and more.

[0003] On the other hand, lessons learned from the Great East Japan Earthquake and the Kumamoto Earthquake require us to anticipate even larger earthquake motions with a greater predominance of long-period components than before. For disaster prevention base facilities and super-high-rise buildings in urban areas, proposals for seismic isolation and control technologies that achieve even better structural performance are required.

[0004] In light of these trends, a seismic isolation structure has been proposed in Patent Document 1 below in order to achieve both consideration for larger earthquake motions and higher seismic isolation performance. This seismic isolation structure has multiple seismic isolation layers, including a base seismic isolation layer and an intermediate seismic isolation layer. Furthermore, the core, which is integrated with the upper frame on the intermediate seismic isolation layer, is structured to penetrate all the way to the foundation. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2018-9442 Summary of the Invention [Problem to be solved by the invention]

[0006] The location of the intermediate isolation layer is often determined by the building's purpose and structural type. When the intermediate isolation layer is installed on a higher floor, a lower isolation layer may be installed on a middle or lower floor, resulting in a building with an outer frame (base frame) between the intermediate and lower isolation layers exceeding 100 meters in height. There are also buildings where the core and outer frame are not connected by seismic control devices. In this case, until the intermediate isolation layer is installed, the very slender (high tower ratio) core and the seismically isolated outer frame are constructed independently. If a level 2 earthquake occurs during construction more than 60 meters from the lower isolation layer, the independent core and outer frame will behave differently, and there is a risk of them colliding.

[0007] Therefore, the present invention has been made in consideration of the above circumstances, and provides a method for constructing a structure that can suppress collision between a core portion and an outer frame portion during construction. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention employs the following means. In other words, the method of constructing a structure according to the present invention involves constructing a core section, installing a seismic isolation layer on the outside of the core section, constructing an outer frame section above the seismic isolation layer, and when the height of the outer frame section reaches approximately 60 m, connecting the top of the core section and the top of the outer frame section with connecting members made of steel material.

[0009] In this construction method for a structure configured as described above, when the height of the outer frame reaches approximately 60m, the core and outer frame are connected with steel connecting members. This reduces the response acceleration and inter-story deformation angle during an earthquake, and also prevents collisions between the core and outer frame during construction.

[0010] In the method for constructing a structure according to the present invention, the connecting material may be an H-beam.

[0011] In the construction method for a structure configured in this way, the connecting members are H-shaped steel beams, which allows the connecting members to have a simple structure and can be used when constructing upper floors such as the upper frame section. [Effects of the Invention]

[0012] According to the method for constructing a structure of the present invention, it is possible to prevent collision between the core portion and the outer frame portion during construction. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a front view showing a construction method for a structure according to an embodiment of the present invention. [Figure 2] FIG. 10 is a diagram showing the load-deformation relationship of a connecting material. [Figure 3] FIG. 10 is a diagram showing the analysis results of a construction method for a structure according to one embodiment of the present invention, illustrating the relationship between displacement and floors. [Figure 4] FIG. 10 is a diagram showing the analysis results of a construction method for a structure according to one embodiment of the present invention, illustrating the relationship between acceleration and floors. [Figure 5] FIG. 10 is a diagram showing the analysis results of a construction method for a structure according to one embodiment of the present invention, illustrating the relationship between the inter-story deformation angle and the floor. [Figure 6] FIG. 10 is a diagram showing the analysis results of a construction method for a structure according to one embodiment of the present invention, illustrating the inter-building displacement of the top. DETAILED DESCRIPTION OF THE INVENTION

[0014] A method for constructing a structure according to one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a method for constructing a structure according to one embodiment of the present invention. As shown in Figure 1, the structure 1 constructed using the structure construction method of this embodiment comprises a lower frame section 11, a core section 12, a lower seismic isolation layer 13, an outer frame section 14, an intermediate seismic isolation layer 16, and an upper frame section 17.

[0015] The lower frame 11 is constructed with a known earthquake-resistant structure. The lower frame 11 is installed, for example, between columns, and bracing materials and earthquake-resistant walls are installed. The lower frame 11 is installed on the ground, or the lower part is buried in the ground.

[0016] The core portion 12 is constructed above the lower frame portion 11. The core portion 12 is a central core located at the center of the lower frame portion 11 in a plan view. The core portion 12 may be an eccentric core located at a position shifted from the center of the lower frame portion 11 in a plan view, or may be an end core located at both ends of the lower frame portion 11 in a plan view. The placement position of the core portion 12 on the lower frame portion 11 in a plan view can be set as appropriate.

[0017] The core portion 12 has a shaft on which components such as elevator equipment, water supply and drainage equipment, air conditioning equipment, and electrical equipment are arranged. The core portion 12 does not necessarily have to have a shaft.

[0018] A seismic isolation layer (not shown) may be installed above the lower frame section 11, and the core section 12 may be constructed above the seismic isolation layer.

[0019] Above the lower frame section 11, a lower seismic isolation layer 13 is installed outside the core section 12. The lower seismic isolation layer 13 is arranged at a distance from the core section 12 in a plan view. For example, the lower seismic isolation layer 13 is arranged outside the core section 12 in a square shape in a plan view.

[0020] Seismic isolation devices and damping devices are installed in the lower seismic isolation layer 13. For example, the seismic isolation devices can be any one or more of laminated rubber, sliding bearings, and linear sliders. The damping devices can be any one or more of oil dampers, lead dampers (including LRBs embedded in laminated rubber), steel dampers, and friction dampers.

[0021] The outer frame section 14 is installed above the lower seismic isolation layer 13. The lower seismic isolation layer 13 and the outer frame section 14 are installed independently from the core section 12 in plan view.

[0022] The intermediate seismic isolation layer 16 is installed above the outer frame section 14. The intermediate seismic isolation layer 16 is equipped with a seismic isolation device and a damping device.

[0023] The upper frame section 17 is constructed above the intermediate seismic isolation layer 16. On the floor on which the upper frame section 17 is installed, the upper frame section 17 and the core section 12 are integrated. On the floor on which the upper frame section 17 is installed, the upper frame section 17 and the core section 12 are structurally connected.

[0024] Next, the construction method of the structure will be described. A lower frame section 11 is constructed. A core section 12 is constructed above the lower frame section 11, a lower seismic isolation layer 13 is installed outside the lower frame section 11, and an outer frame section 14 is constructed above that.

[0025] The upper floors of the core section 12 and the outer frame section 14 are constructed, and when the height H1 of the outer frame section 14 reaches approximately 60 m, the outer frame section 14 is connected to the core section 12 at approximately 60 m with connecting members 20. At this stage, the intermediate seismic isolation layer 16 and the upper frame section 17 have not yet been constructed. It is preferable that the position of the core section 12 to be connected with connecting members 20 is on the same floor (same height) as the outer frame section 14.

[0026] The connecting member 20 is made of steel. The cross-sectional shape of the connecting member 20 is set so that it undergoes elastic deformation in a level 1 earthquake motion and becomes plastic in a level 2 earthquake motion. For example, H-shaped steel (400-200-8-13) can be used as the connecting member 20. Figure 2 shows the load-deformation relationship of the connecting member 20.

[0027] The core section 12 and outer frame section 14 are constructed on the floors above the connecting material 20. The intermediate seismic isolation layer 16 is installed and the upper frame section 17 is constructed above it. Once the core section 12 and the upper frame section 17 are structurally connected on the floors above the intermediate seismic isolation layer 16, the connecting material 20 is removed.

[0028] Figures 3 to 5 show the analysis results of a construction method for a structure according to one embodiment of the present invention, with Figure 3 showing the relationship between displacement and floor, Figure 4 showing the relationship between acceleration and floor, and Figure 5 showing the relationship between story deformation angle and floor. The "core" in the figures corresponds to the core section 12, and the periphery corresponds to the "external frame section 14." The construction method for the structure according to this embodiment corresponds to "plastic" in the figures. The "elastic" in the figures refers to a configuration in which the connecting member 20 is replaced with an elastic member, shown as a comparative example. An elastic member corresponds to a member with a cross section large enough that it will not become plastic even in a level 2 earthquake motion. The input earthquake motion is the Kobe phase of the level 2 earthquake. The connecting member 20 and the elastic member of the comparative example are installed on the 26th floor (60 m from the lower seismic isolation layer 13).

[0029] As shown in the displacement distribution in FIG. 3, by connecting the core portion 12 and the outer frame portion 14 with the connecting material 20, there is no adverse effect on the displacement and no significant change.

[0030] As shown in the acceleration distribution in Figure 4, in the comparative example, a large acceleration occurs around the 15th floor, but by making the structure plastic as in this embodiment, the acceleration is reduced to 250 cm / s 2 The acceleration is within this range.

[0031] As shown in the distribution of story drift angles in Figure 5, in the comparative example, the story drift angle significantly exceeds 1 / 150 on the 25th floor and below (directly below the floor where the elastic members are installed), impairing the soundness of the structure. On the other hand, by making the building plastic as in this embodiment, it is possible to keep the story drift angle at 1 / 150 or less.

[0032] Figure 6 shows the analysis results of a construction method for a structure according to one embodiment of the present invention, illustrating the inter-building displacement at the top. The "core" corresponds to the core section 12, and the house corresponds to the "outer frame section 14." The input earthquake motion is the Kobe phase of the Level 2 earthquake. The connecting member 20 and the elastic member of the comparative example are installed on the 26th floor (60 m from the lower seismic isolation layer 13).

[0033] As shown in Figure 6, in this embodiment, the maximum inter-building displacement between the core section 12 and the outer frame section 14 directly below the intermediate seismic isolation layer 16 (at the 44th floor) is 380 mm, eliminating the risk of collision.

[0034] In the construction method for a structure configured in this manner, when the height H1 of the outer frame portion 14 reaches approximately 60 m, the core portion 12 and the outer frame portion 14 are connected by connecting members 20 made of steel material. This makes it possible to suppress the response acceleration and inter-story deformation angle during an earthquake, and to prevent collisions between the core portion 12 and the outer frame portion 14 during construction.

[0035] Furthermore, the connecting members 20 are H-shaped steel beams. Therefore, the connecting members 20 can have a simple configuration, and can be used when constructing the upper frame portions 17 and the like on the upper floors.

[0036] The shapes and combinations of the components shown in the above-described embodiment are merely examples, and various modifications can be made based on design requirements, etc., within the scope of the present invention.

[0037] For example, in the embodiment described above, the structure 1 has a lower frame section 11, but the present invention is not limited to this. The structure 1 may not have a lower frame section 11, and the core section 12 may be installed directly on the installation surface such as a foundation, and the lower seismic isolation layer 13 may be installed directly on the installation surface such as a foundation, with the outer frame section 14 installed above that. Even in this case, when the height H1 of the outer frame section 14 above the lower seismic isolation layer 13 reaches approximately 60 m, the outer frame section 14 is connected to the core section 12 at a position approximately 60 m away by the connecting member 20.

[0038] The Sustainable Development Goals (SDGs) are 17 international goals adopted at the United Nations Summit in September 2015. The structure construction method according to this embodiment can contribute to achieving one of the 17 SDGs, for example, goal 9, "Build resilient infrastructure, promote inclusive and sustainable industrialization, and foster innovation." [Explanation of symbols]

[0039] 1. Structure 12 コアBE 13. Seismic isolation layer 14. Outer structural section 20 Connecting materials

Claims

1. Build the core, A seismic isolation layer is installed outside the core portion, An outer frame section is constructed above the seismic isolation layer, A construction method for a structure in which, when the height of the outer frame section reaches approximately 60 m, the upper part of the core section and the upper part of the outer frame section are connected with connecting members made of steel material.

2. 2. The method for constructing a structure according to claim 1, wherein the connecting members are H-section steels.

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