JP2001173269A - Construction method of seismic isolation building - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a method of constructing a base-isolated building which is advantageous in terms of construction period and cost, particularly when building a building having a base-isolated layer underground by using a reverse construction method. SOLUTION: As a pillar constituting the lower part of a base-isolated building,
The trussed pillar 16 is installed so that the upper end thereof reaches the above-ground part of the upper layer 13, and the trussed pillar 16 supports the upper layer 13 and temporarily receives the upper layer 13 from the lower layer 14 side. A temporary receiving member is provided, and a portion of the truss pillar 16 located in the seismic isolation layer 12 is removed.
In the configuration in which the temporary receiving member is removed after that, when the straight pillar 16 is installed, the diameter of the filled concrete C in the portion located in the seismic isolation layer 12 is determined by the inner diameter of the steel pipe 2. Form smaller than the dimensions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for constructing a base-isolated building.

[0002]

2. Description of the Related Art As is well known, a seismic isolation layer is formed by interposing a seismic isolation device between a foundation of a building and a lower part and an upper part, and the upper part and the ground are formed by the seismic isolation layer. Insulate
Various seismic isolation buildings have been realized to reduce the vibration response of buildings. Such seismic isolation buildings have an excellent effect that can greatly reduce the vibration response of the building, so their application range is gradually expanding, and in recent years, basement floors are being seismically isolated. For this reason, there are cases where seismic isolation devices are installed under the building.

By the way, as described above, a base-isolated building has a structure in which an upper part is supported on a foundation or a lower part via a seismic isolation layer. Has been adopted in advance, and thereafter, a method of arranging a seismic isolation device on a foundation or a lower layer portion and constructing an upper layer portion on the seismic isolation device has been adopted.

However, according to the above-mentioned method, it is necessary to construct a foundation or a lower layer portion in advance of an upper layer portion and to sequentially perform construction. Therefore, especially when the seismic isolation device is located on the basement floor, the construction of the skeleton located underground must be divided into a part below the seismic isolation device and a part above the seismic isolation device. However, the construction period is longer than that of a general building, and the construction cost is also increased.

[0005] Therefore, it has been proposed to construct a base-isolated building by applying a reverse hitting method which is effective for cost reduction and shortening of the construction period even when the base-isolated layer is underground. In this case, as a specific construction method, for example, the following method can be considered. In other words, the above-ground part of the building frame is constructed while being supported directly from the foundation piles by timber columns, and at the same time, the underground part is constructed by the reverse striking method. While receiving
The trussed pillar located in the seismic isolation layer is removed, and then the seismic isolation device is interposed between the upper and lower layers to form the seismic isolation layer and the temporary receiving jig is removed.

When such a construction method is adopted, the underground part and the seismic isolation layer can be constructed while the above-ground part is being constructed, so that the construction period can be greatly reduced. In addition, since it is not necessary to provide a support such as a cutting beam which is conventionally provided when performing root cutting, cost can be reduced.

[0007]

In the above-mentioned construction method, since the timber columns support the ground part of the building frame from the foundation pile side, a very large axial force is applied to the timber columns. Works. For this reason, it is desirable to adopt a concrete-filled steel pipe column 1 as shown in FIG.

[0008] The concrete-filled steel pipe column 1 comprises a steel pipe 2
Is filled with concrete C, the concrete C can bear the axial force, and the periphery of the concrete C can be restrained by the steel pipe 2 to prevent the deformation of the concrete C. The shaft proof strength can be exhibited.

However, when such a concrete-filled steel pipe column 1 is employed, it is very difficult to remove a part of the straight pillar, and there is a concern that it will have a significant effect on the construction period and cost.

The present invention has been made in view of the above circumstances, and particularly when a building having a seismic isolation layer underground is constructed by using a reverse hitting method, the seismic isolation is advantageous in terms of the construction period and cost. It is an object to provide a building construction method.

[0011]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. In other words, the method for constructing a base-isolated building according to claim 1 is a method for constructing a base-isolated building having an upper layer portion and a lower layer portion which are located vertically above and below a seismic isolation layer, wherein the pillars constituting the lower layer portion As a straight pillar formed by concrete filled steel pipe,
At least the upper end is installed so as to reach the above-ground portion of the upper layer portion, and by the straight pillar, the upper layer portion is supported, and a temporary receiving member for temporarily receiving the upper layer portion from the lower layer side is provided, Remove the part located in the seismic isolation layer of the framed pillar, interpose a seismic isolation device there,
Thereafter, the temporary receiving member is removed, and when installing the straight pillar, the diameter of the filled concrete located in the seismic isolation layer is set to the diameter of the steel pipe of the straight pillar. It is characterized in that it is formed smaller than the inner diameter.

[0012] In order to have such a configuration, in the seismic isolation layer, the inner pipe is arranged inside the steel pipe constituting the straight pillar, and the inner pipe is used as a form, and concrete is formed only inside the steel pipe. By filling, a straight pillar can be formed. In this case, when installing the seismic isolation device, the only concrete to be removed in the seismic isolation layer is the inner pipe part, which is removed compared to the case where the steel pipes constituting the trussed pillars are evenly filled with concrete. The cross-sectional area of the concrete to be made can be reduced. Furthermore, the inner pipe can be made thinner than the outer steel pipe, and in this case, cutting can be made easier. Further, since the outer steel pipe and the concrete are not attached to each other, the outer steel pipe can be easily cut.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described.
Description will be given based on the drawings. Hereinafter, the same components as those of the above-described conventional technology are denoted by the same reference numerals, and description thereof will be omitted. FIG. 5 is a diagram showing a schematic configuration of the base-isolated building 10 constructed by applying the construction method in the present embodiment. This seismic isolation building 10 is configured such that an upper layer portion 13 and a lower layer portion 14 are located vertically above and below a seismic isolation layer 12 having a seismic isolation device 11.

As the pillars constituting the upper layer portion 13 and the lower layer portion 14, a straight pillar 16 having a lower end 16a integrated with a foundation pile 15 is used. As the straight pillar 16, a concrete-filled steel pipe column similar to the concrete-filled steel pipe column 1 shown in FIG. 6 is used. Further, the trussed pillar 16 is configured to be vertically divided with the seismic isolation device 11 interposed therebetween.

Next, a method of constructing the base-isolated building 10 will be described with reference to FIG. 6 and FIGS. First, as shown in FIG. 6, the retaining piles 18, 18 are provided so as to surround the installation target position of the base-isolated building 10 in the ground G, and the foundation pile 15 is provided in the ground G inside the retaining wall 18, 18. Is installed. Further, the column 16 is connected to the
To form In this case, the truss pillar 16 is formed so that the upper end thereof reaches the above-ground portion of the upper layer portion 13.

FIG. 1 shows a structure pillar 16 formed in this case.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 2 is a sectional view taken along line II in FIG. As shown in this figure, in the seismic isolation layer 12, the trussed pillar 16 has a double pipe structure in which an inner pipe 17 made of a steel pipe is further disposed inside the steel pipe 2. Is filled with concrete C only. Thereby, the diameter of the portion of the filled concrete C located in the seismic isolation layer 12 is formed to be smaller than the diameter of the steel pipe 2. The inner pipe 17 has a smaller thickness than the steel pipe 2.

Subsequently, a base slab 19 (see FIG. 6) of the upper layer portion 13 is formed at substantially the same position as the surface of the ground G. At this time, the base slab 19 is formed in a state of being integrated with the straight pillar 16. Thereby, the foundation slab 19 and the upper layer part 13 are supported from the foundation pile 15 side via the straight pillar 16.

Then, the ground G below the foundation slab 19 is cut off. In this case, the foundation slab 19 is
It is used as a support against earth pressure to hold 8,18. Furthermore, when the space below the foundation slab 19 is excavated to a certain depth, the upper surface 14a of the lower layer portion 14 is formed, and the lower layer portion 14 is formed in the ground G while excavating below the lower portion. Thus, a structure as shown in FIG. 6 is formed.

On the other hand, the upper surface 14a of the formed lower layer portion 14
A seismic isolation device 11 is interposed between the upper layer 13 and the upper layer 13. For this purpose, as shown in FIG. 3, the upper layer portion 13 is temporarily received from the lower layer portion 14 side by using the temporary receiving member 22, and in this state, the upper portion 13 is positioned within the seismic isolation layer 12 of the truss pillar 16. Cut off the part to be removed. Then, the seismic isolation device 11 is disposed on the removed portion as shown in FIG.
Connect the upper and lower framed pillars 16 divided by
The temporary receiving member 22 is removed. Thereby, the construction of the seismic isolation layer 12 is completed. Further, by removing the retaining walls 18, 18, a structure as shown in FIG. 3 is obtained.

In the above-described method of constructing the base-isolated building 10, the diameter of the filled concrete C in the portion of the trussed pillar 16 located in the base-isolated layer 12 is smaller than the diameter of the steel pipe 2. As compared with the case where the filled concrete C is completely filled in the steel pipe 2, the cross-sectional area of the filled concrete C to be removed can be reduced. Cutting and removal can be facilitated. In addition, inner pipe 1
7 is easy to cut because its thickness is smaller than that of the outer steel pipe 2. Further, since the steel pipe 2 and the filled concrete C do not adhere to each other, the steel pipe 2 can be easily cut. As described above, in the case of constructing the base-isolated building 10 by using the reverse striking method, the removal of the timber columns 16 in the base-isolated layer 12 is facilitated to facilitate the construction work, and the construction period is shortened and the construction is completed. Costs can be reduced.

In the above embodiment, the seismic isolation layer 1
2 can be installed on any of the basement floors of the base-isolated building 10. The inner pipe 17 used in the above embodiment is used to fill concrete to the bottom of the steel pipe 2 when the concrete C is poured from above into the straight pillar 16. What is necessary is just to be what continues up and down inside the inside. Therefore, the inner pipe 17 can have a minimum pipe diameter and a minimum wall thickness for placing the concrete C, thereby facilitating removal. In addition, a gas pipe or the like can be appropriately selected as a material.

[0022]

As described above, according to the method of constructing a base-isolated building according to the present invention, the diameter of the concrete filled in the part of the trussed pillar in the seismic isolation layer is the diameter of the steel pipe of the trussed pillar. Since it is formed to be smaller than the dimensions, the cross-sectional area of the packed concrete to be removed can be reduced. Thereby, the cutting and removing operation can be facilitated. Moreover, since the steel pipe and the filled concrete do not adhere to the part to be removed, the steel pipe is easily cut. As described above, when constructing a seismically isolated building using the reverse hitting method, it is possible to facilitate the construction work, to shorten the construction period, and to reduce the construction cost.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing an embodiment of the present invention, and is an enlarged vertical sectional view of a main part of a timber column used when constructing a seismic isolation building.

FIG. 2 is a sectional view taken along line II in FIG.

FIG. 3 is an elevational sectional view showing a situation in which an upper layer is temporarily received from a lower layer in order to interpose a seismic isolation device between an upper layer and a lower layer of a base-isolated building.

4 is an elevational sectional view showing a situation when a seismic isolation device is interposed between an upper layer portion and a lower layer portion from the state shown in FIG. 3;

FIG. 5 is a vertical sectional view showing a schematic configuration of a base-isolated building to which the method of constructing a base-isolated building according to the present invention is applied.

6 is an elevational sectional view showing a situation when the seismic isolation building shown in FIG. 5 is constructed.

FIG. 7 is a plan sectional view of a general concrete-filled steel pipe column.

[Explanation of symbols]

 2 Steel Pipe C Filled Concrete 10 Seismic Isolation Building 11 Seismic Isolation Device 12 Seismic Isolation Layer 13 Upper Layer 14 Lower Layer 15 Foundation Pile 16 Structural Pillar (Concrete Filled Steel Pipe) 22 Temporary Supporting Member

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hidemi Kobayashi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Hideo Uchimoto 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Katsunori Suzuki 1-18-22 Nishiki, Naka-ku, Nagoya City, Aichi Prefecture Takenaka Corporation Nagoya Branch

Claims (1)

[Claims] 1. A method for constructing a base-isolated building having an upper part and a lower part located vertically above and below a seismic isolation layer, wherein the pillars constituting the lower part are formed of concrete-filled steel pipes. A true pillar is installed such that at least the upper end thereof reaches the above-ground part of the upper part, and the straight pillar supports the upper part, and temporarily receives the upper part from the lower part side. A member is provided, a part of the straight pillar positioned in the seismic isolation layer is removed, a seismic isolation device is interposed there, and then, the temporary receiving member is removed. The seismic isolation is characterized in that, when the straight pillar is installed, the diameter of the portion of the filled concrete located in the seismic isolation layer is smaller than the inner diameter of the steel pipe of the straight pillar. How to build a building.