JP2001032524A - Building construction method - Google Patents

Abstract

(57) [Problem] To efficiently construct a building in which a top structure is provided at the top of a core shaft and a building body is provided below the top structure. SOLUTION: A top structure 4 is grounded, and a core shaft 1 is formed.
Are sequentially raised, the top structure is temporarily supported on the core shaft, and the reaction force is applied thereto. Then, the top structure is sequentially moved up. After the top structure is installed on the top of the core shaft, the building body 5 is placed below the top structure. It will be laid one after another and set up. When applied to a building in which the top structure is swingably supported on a core shaft via a swing support device such as a ball seat 3, the building is temporarily mounted on the top of the core shaft while the building is temporarily supported on the top of the core shaft. After lifting the main body and suspending and supporting all floors of the building main body, the top structure is supported so as to be capable of swinging in all directions on a swing support device provided on the top of the core shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method for a building, and more particularly to a construction method suitable for a special type of building such as an earthquake-resistant building.

[0002]

2. Description of the Related Art As is well known, a structure for improving the seismic resistance of a building includes a bearing structure for enhancing rigidity by increasing rigidity and a seismic isolation device for increasing the natural period of the building by using a seismic isolation device. There is a seismic isolation structure that reduces the vibration, a type of damping device installed at a key point in the building to control the vibration and absorb the energy, and various types have been proposed and put into practical use. Various construction methods have been tried according to the form.

[0003]

However, the seismic structures proposed so far have advantages and disadvantages such as difficulty in designing, restrictions on the size and form of the building, and high costs. In fact, effective structures and construction methods are being sought.

[0004]

According to the first aspect of the present invention, there is provided a high-rigidity core shaft provided at the center of a building, a top structure provided at the top of the core shaft, and a structure provided below the top structure. A construction method intended for a building having a multi-story building body portion provided, wherein the top structure is laid and the core shaft is sequentially raised while the top structure is being formed. After temporarily supporting the core shaft and taking up a reaction force from the core shaft and sequentially moving up, the core shaft is built up to the top, and the top structure is installed on the top of the core shaft. Below the body, the building main body is sequentially laid from the top, suspended from the top structure, and installed around the core shaft.

According to a second aspect of the present invention, there is provided a high-rigidity core shaft provided at the center of a building, and a main structure supported swingably around the core shaft with the top of the core shaft as a fulcrum, The main structure is intended for a building in which a multi-story building body is suspended and supported around the core shaft from a high-rigidity top structure supported on the top of the core shaft via a swing support device. The top structure is grounded, and while the core shaft is sequentially raised, the top structure is temporarily supported on the core shaft and a reaction force is generated by the core shaft. Then, with the core shaft constructed up to the top and the top structure temporarily provisionally supported on the top of the core shaft, the building main body is removed below the top structure. The ground structure was sequentially erected from the top, lifted from the top structure, suspended and supported by the top structure, suspended and supported on all levels of the building body, and then provided with the top structure on the top of the core shaft. The swing support device is configured to be swingably supported.

[0006]

1 and 2 show the outline of a building to be constructed by the construction method of the present invention. FIG. 1 is a vertical sectional view and FIG. 2 is a plan view of a reference floor. This building is shown in Figure 1.
As shown in FIG. 1, a high-rigidity core shaft 1 is provided at the center of a building, and a main structure 2 is supported around the top of the core shaft 1 so as to be swingable in all directions. The main structure 2 includes a high-rigidity top structure 4 supported on the top of the core shaft 1 via a ball seat (oscillation support device) 3, and a multi-story building suspended and supported by the top structure 4. It comprises a main body 5.

The core shaft 1 is a reinforced concrete structure having high axial rigidity and high bending rigidity capable of supporting the entire vertical load (own weight) of the entire building and the entire horizontal load during an earthquake. As shown in FIG. 2, the horizontal cross-sectional shape is substantially square, and the inside is used as a common space such as an elevator and a staircase, that is, as a center core of the whole building. A ball 3 made of cast steel is provided at the center position of the top of the core shaft 1, and the main structure 2 is supported by the ball 3 so as to be swingable in all directions.

The top structure 4 constituting the main structure 2
Is of high rigidity capable of suspending and supporting the entire weight of the building body 5, and in this embodiment, is constituted by a large-scale truss (so-called hat truss) made of steel. The top structure 4 has a square shape in a plan view and is large enough to protrude toward the outer peripheral side of the core shaft 1. The center of the top structure 4 is swung in all directions at a single point by the core shaft 1 via the above-mentioned ball seat 3. Supported where possible. A support 6 protruding upward is provided at the center of the top structure 4, and a tension member 7 for suspending and supporting the peripheral portion of the top structure 4 is provided from the support 6, whereby the top structure 4 is provided. The structure can be simplified while the rigidity of the building 4 is secured, and the building body 5 can be stably supported.

The building body 5 has the same form as that of an ordinary multi-story building including columns 8, beams 9, and slabs 10, but it is suspended from the top structure 4 and floats above the ground surface. It is installed around the core shaft 1 in a state.
Clearances 11 and 12 are secured between the inner periphery of the building body 5 and the core shaft 1 and between the lower end of the building body 5 and the ground.
Are swingable in all directions integrally with the top structure 4. The passages 13 are provided in each layer between the building body 5 and the core shaft 1, and the passages 13 are provided via expansion joints so as not to restrict the swing of the building body 5.

[0010] In the building having the above structure, the main structure 2 is a ball seat 3 at the top of the core shaft 1 as shown in FIG.
While being supported by the pendulum, it responds as a pendulum that can swing in all directions like a yajirobe. Therefore, by setting the natural period of the main structure 2 as a pendulum to be sufficiently longer than the assumed earthquake motion period, resonance of the main structure 2 with respect to an earthquake input can be almost completely prevented. According to the simulation, the natural period of the main structure 2 is about 13 seconds or more in a building of about 20 stories having the above structure, which is much longer than that of a long-period type ground motion.

As described above, according to the building having the above structure,
It is possible to realize a long or very long period of the building body 5 which is a living space, and therefore, the building body 5 hardly vibrates even in the event of an earthquake. Even for a building installed on the ground, it is possible to ensure sufficient safety against earthquakes and livability.

According to the building having the above structure, the main body 5 of the building is suspended from the top structure 4 and installed in a state of being suspended above the ground surface. Instead, it may be a simple hanging material. Therefore, the structure of the building main body 5 may be any structure as long as the slab 10 of each layer is suspended and supported by the pillars 8 as suspending members, as shown as another model in FIG. 4, and the pillars 8 secure a desired tensile strength. It is not impossible to use a steel material having the smallest possible cross section, or to employ a parallel strand cable as the column 8. Further, for the same reason, the required number of pillars 8 can be reduced, so that the internal space of the building body 5 can be made pillarless, and the building body 5
There is also an advantage that the site is widely opened because it is floating above the surface of the ground and effective utilization can be achieved. However, it is preferable that the building main body 5 swings as an integrated pendulum as a whole. Therefore, for example, as shown in FIG. 4, a stiffening means 14 such as a brace is provided on each layer to restrict the interlayer displacement of each layer. Is preferred.

Further, since the core shaft 1 always receives the total weight of the entire building as a vertical load, the tensile stress generated in the core shaft 1 can be almost neglected even in consideration of stress fluctuation during an earthquake. And therefore the core shaft 1
And the foundation is structurally simple and clear, its design is easy, and ordinary reinforced concrete structures are sufficient. However, since the natural period of the core shaft 1 itself is naturally short, it is assumed that the core shaft 1 resonates during a short-period earthquake. If there is a concern that the vibration of the core shaft 1 is transmitted to the main structure 2 via the ball seat 3, a seismic isolation device or a vibration damping device is interposed in the support portion to make the core. Vibration transmission from the shaft 1 to the main structure 2 can be controlled.

In a building having the above structure, it is assumed that the main structure 2 is swung by the wind load. Therefore, when there is a concern that the livability may be impaired by the swing due to the wind load. In order to prevent this, for example, as shown in FIG. 4, between the building main body 5 and the core shaft 1 or the ground, the swing of the main structure is normally restrained, and the swing is released in the event of an earthquake. Fuse mechanism 1 that allows movement
5 is preferably provided. As the fuse mechanism 15, a mechanism that mechanically operates by receiving seismic force or a mechanism that forcibly operates by detecting an earthquake with a sensor can be suitably used. It is effective to install the fuse mechanism 15 at the lowermost part of the building main body 5 in order to restrain the swing in the normal state.

Also, various dampers 16 are provided between the building body 5 and the core shaft 1 or the ground to operate when the main structure 2 swings during an earthquake and absorb the vibration energy. In addition, it is possible to suppress the swing of the main structure 2 and quickly attenuate it. The damper 16 may be incorporated into the fuse mechanism 15 as shown in FIG. 4, or the fuse mechanism 15 itself may have a function as the damper 16. Further, by providing a large number of such dampers 16 between the core shaft 1 and the building main body 5, the vibration of the core shaft 1 during the above-described earthquake can be suppressed and attenuated by these dampers 16. .

The structure of a building to be constructed by the construction method of the present invention has been described above. Next, an embodiment of the construction method will be described with reference to FIGS.

First, as shown in FIG. 5, the top structure 4 is laid in the ground, and is supported in a state where it is floated on the ground surface by the columns 20, and the lowermost layer portion of the core shaft 1 is constructed below it. The top structure 4 is supported by the climbing mast 21 from the core shaft 1.

As shown in FIGS. 6 and 7, while the core shaft 1 is sequentially raised, the climbing mast 2
The climbing mast 21
As a result, a reaction force is taken from the core shaft 1 and the top structure 4 is sequentially pushed up.

As shown in FIG. 8, while the core shaft 1 is constructed to the top and the top structure 4 is temporarily supported thereon, the ball seat 3 is constructed on the top of the core shaft 1 as shown in FIG. I do.

Then, as shown in FIGS. 10 and 11, the building main body 5 is sequentially laid from the top portion around the core shaft 1, that is, below the top structure 4, for example, three layers at a time. It is lifted and suspended from the top structure 4. At this time, the pillar 8 itself of the building body 5 can be used as a hanging material.

As shown in FIG. 12, the entire structure of the building main body 5 is suspended from the top structure 4, and the stiffening means 14, such as braces, the fuse mechanism 15, the damper 16 and the like are installed. 4 is swingably supported with respect to the ball base 3, and the climbing mast 21 is finally removed.

According to the above construction procedure, the core shaft 1
In addition to being able to efficiently construct a very special structure in which the top structure 4 is supported by the ball seat 3 without hindrance, in particular, the top structure 4 is gradually erected and grounded. , And the building body 5 is also laid on the ground, so that most of the main work can be carried out on the ground,
Therefore, work at high places can be reduced and material transportation to high places can be reduced, so that the workability is extremely excellent. Also,
Since the top structure 4 is pre-constructed and most of the subsequent work is performed below the top structure 4, the top structure 4 functions as a roof during the construction, thereby realizing all-weather construction.

Although the embodiment of the present invention has been described above, the construction method of the present invention is a very special building in which the top structure 4 is swingably supported in all directions by the ball seat 3 as described above. However, the present invention is not limited to this, and can be similarly applied to a building in which the top structure 4 is provided on the top of the core shaft 1 and the building body 5 is provided below the top structure 4.

Further, the construction method of the present invention provides the above-described ball seat 3
Instead, the present invention can be similarly applied to the construction of a building employing an aggregate of a plurality of seismic isolation devices 30 as shown in FIG. As shown in FIG. 13 (a), this building is installed in an inclined state so as to face a virtual center O, and a plurality of seismic isolation devices that support the main structure 2 so as to swing around the center O are provided. An assembly of the devices 30 is adopted as a swing support device, and each seismic isolation device 30 is configured to operate along a tangential direction of a virtual curved surface S having a virtual radius R.
As the seismic isolation device 30, not only the laminated rubber as shown in the illustrated example but also a bearing support or a sliding support can be adopted. As the above-mentioned virtual curved surface S, it is conceivable to set a spherical surface or a cylindrical surface according to the form of the building or the like. In the case of a spherical surface, swing in all directions is possible, and in the case of a cylindrical surface, the cylindrical surface Can be swung in the circumferential direction. In this case, it is only necessary that the seismic isolation devices 30 have a common center O and can rotate around the center O. In this case, a single virtual curved surface S is set as shown in FIG. However, as schematically shown in (b) or (c),
If a virtual curved surface S (S1, S2) having a desired rotation radius R (R1, R2) is set for each seismic isolation device 30 or for each group by dividing the seismic isolation device 30 into an arbitrary group. good.

[0025]

According to the first aspect of the present invention, when constructing a building in which a top structure is provided at the top of a core shaft and a building body is provided below the top structure, the top structure is grounded, While gradually starting up, take the reaction force from the core shaft and gradually move up the top structure, and below the top structure, hang the building body part from the top one by one and hang it up. Since it is installed below, most of the main work can be carried out on the ground, so that work in high places can be reduced and material transport to high places can be reduced, so that the workability is extremely excellent. In addition, since the top structure is pre-constructed and most of the subsequent work is performed below the top structure, the top structure functions as a roof during the construction, thereby realizing all-weather construction.

According to a second aspect of the present invention, a construction is provided in which a top structure is swingably provided on the top of a core shaft via a swing support device, and a building body is suspended from the top structure and supported. While the top structure is grounded and the core shaft is sequentially raised, the top structure is temporarily supported on the core shaft, and the core shaft is gradually raised by taking a reaction force from the core shaft. In the state where the top structure is temporarily supported on the top of the core shaft, the building body is sequentially erected from the top under the top structure, and then lifted from the top structure and lifted from the top structure. After suspending and supporting all levels of the building main body, the top structure is swingably supported by the swing support device provided on the top of the core shaft, so that the same effects as above are achieved. In addition to Rukoto, the building of very special structure of the major structures to the core shaft is supported by a swing supporting device can be without any trouble efficiently construction.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing an outline of a building to be constructed according to the present invention.

FIG. 2 is a plan view of a reference floor.

FIG. 3 is a diagram modeling the same building.

FIG. 4 is a diagram showing the same building as another model.

FIG. 5 is a view showing an embodiment of the construction method of the present invention, and is a view showing a state in which a top structure is grounded.

FIG. 6 is a view showing a state in which the core shaft is raised and the top structure is pushed up.

FIG. 7 is a view showing a state in which the core shaft is raised and the top structure is pushed up similarly.

FIG. 8 is a view showing a state where the core shaft is raised up to the top and the top structure is temporarily supported.

FIG. 9 is a diagram showing a state where a ball seat is provided on the top of the core shaft.

FIG. 10 is a diagram showing a state where the building main body is grounded.

FIG. 11 is a diagram showing a state where the building body is lifted.

FIG. 12 is a diagram showing a state where all floors of the building body are lifted.

FIG. 13 is a diagram showing an outline of another building to be constructed according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core shaft 3 Ball seat (oscillation support apparatus) 4 Top structure 5 Building main body 30 Seismic isolation device (oscillation support apparatus)

Claims (2)

[Claims] 1. A high-rigidity core shaft provided at the center of a building, a top structure provided at the top of the core shaft, and a multi-story building body provided below the top structure. A construction method intended for a building having the core structure, wherein the top structure is grounded, and while the core shaft is sequentially raised, the top structure is temporarily supported on the core shaft and the core is After taking up a reaction force from the shaft and sequentially moving up, the core shaft is built up to the top and the top structure is installed on the top of the core shaft, and then the building body is placed under the top structure at the top. From the top structure to be installed around the core shaft. 2. A high-rigidity core shaft provided at the center of a building, and a main structure swingably supported around the core shaft with the top of the core shaft as a fulcrum, wherein the main structure is A construction method for a building in which a multi-story building body is suspended and supported around the core shaft from a high-rigidity top structure supported on the top of the core shaft via a swing support device. While the top structure is grounded and the core shaft is sequentially raised, the top structure is temporarily supported on the core shaft, and a reaction force is applied from the core shaft to sequentially approach the top structure. In a state where the core shaft is constructed to the top and the top structure is temporarily supported on the top of the core shaft, the building main body is sequentially grounded from the top below the top structure. Then, after being suspended from the top structure and suspended from the top structure, and suspended and supported on all levels of the building body, the swinging device provided on the top of the core shaft is provided with the top structure. A building construction method characterized in that the building is swingably supported.