JP3728652B2 - How to build a base-isolated building - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a base-isolated building.
[0002]
[Prior art]
As is well known, a base isolation layer is formed by interposing a base isolation device between the foundation of the building or the lower layer and the upper layer, and the upper layer and the ground are insulated by this base isolation layer, Various seismic isolation buildings that reduce the vibration response of buildings have been realized.
Such base-isolated buildings have an excellent effect that can greatly reduce the vibration response of the building, so the range of application is gradually expanding. For this reason, an example in which a seismic isolation device is arranged in the basement of a building can be seen.
[0003]
By the way, as described above, the base-isolated building has a structure in which the upper layer is supported on the foundation or the lower layer via the seismic isolation layer. After that, a method has been adopted in which a seismic isolation device is arranged on the foundation or lower layer and the upper layer is constructed on this seismic isolation device.
[0004]
However, in the above-described method, it is necessary to construct the foundation or lower layer part in advance of the upper layer part and sequentially perform the construction. Therefore, especially when the seismic isolation device is located on the basement floor, the construction of the underground frame must be divided into a part below the base isolation device and a part above the base isolation device. In addition, the construction period is longer than that of ordinary buildings, and the construction cost is increased.
[0005]
Therefore, even when the seismic isolation layer is in the basement, it has been proposed to construct a seismic isolation building by applying a backlash method that is effective in reducing costs such as mountain retaining and shortening the construction period.
In this case, as a concrete construction method, for example, the following is considered. In other words, the ground part of the building frame is constructed with direct support from the foundation pile by the structural pillars, and at the same time, the underground part is constructed by the reverse striking method, and in the seismic isolation layer, the upper part is temporarily constructed from the lower part side. While receiving, the structural pillar located in the seismic isolation layer is removed, and then the seismic isolation device is formed between the upper layer and the lower layer, and the temporary receiving jig To remove.
[0006]
When such a construction method is adopted, the construction period can be greatly shortened because the underground part and the seismic isolation layer can be constructed while the ground part is constructed. In addition, since it is possible to reduce support work such as a cutting beam that has been provided in the past when performing root cutting, it is possible to reduce costs.
[0007]
[Problems to be solved by the invention]
However, in the above construction method, since the upper layer portion is constructed in advance, when the upper layer portion is provisionally received from the lower layer portion side, the load on the upper layer portion becomes very large. It was necessary to make a large-scale jig to be used for provisional reception when installing the device later. Such a large provisional receiving jig not only causes an increase in cost, but also has a problem in installation in a narrow space between the upper layer portion and the lower layer portion.
In addition, since the load on the upper layer is very large, there is a problem with the treatment of the seismic force generated during temporary reception.
[0008]
The present invention has been made in view of such circumstances, and in particular, when a seismic isolation layer is constructed in the basement of a building adopting the reverse driving method, seismic isolation is advantageous in terms of cost and seismic force response. An object is to provide a building construction method.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following means.
The construction method of the seismic isolation building according to claim 1 is a construction method of a seismic isolation building having a lower layer portion and an upper layer portion located above and below with the seismic isolation layer interposed therebetween,
A foundation structure for supporting the base isolation building is provided in the ground at the installation target position of the base isolation building,
The pillar constituting the lower layer part is provided continuously with the foundation structure, and the pillar is formed such that at least the upper end reaches the upper layer part,
Build the lower layer and upper layer in a state supported by the pillars,
At least one of the lower layer portion and the upper layer portion is provided with a seating pillar protruding toward the other in a state where it is located within the installation target position of the seismic isolation layer,
Between the seating column and the other of the lower layer part and the upper layer part, by filling a resin material, the upper layer part is supported from the lower layer part side through the resin material,
A part of the column located in the seismic isolation layer is removed, and a seismic isolation device is interposed therein, and then the resin material is removed.
[0010]
In order to have such a configuration, in this method of building a base-isolated building, using a seating pillar for transferring the load of the upper layer to the lower layer when the laminated rubber of the base isolation device deteriorates, The upper layer portion can be temporarily received when the seismic isolation device is installed, and unlike the conventional case, a temporary receiving jig is not required.
[0011]
The construction method of the base isolation building according to claim 2 is the construction method of the base isolation building according to claim 1,
When filling the resin material, a heating wire is arranged inside the resin material.
[0012]
In this method of building a base-isolated building, when the resin material is removed, the resin material can be made to be thermoplastic by causing the heating wire to be energized, thereby deteriorating the resin material.
[0013]
The construction method of the base isolation building according to claim 3 is the construction method of the base isolation building according to claim 1 or 2,
As the resin material, an ultra-early strong epoxy resin is used.
[0014]
Since it is set as such a structure, in this construction method of a base-isolated building, a resin material can be made to exhibit high compression strength in a short time.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a schematic configuration of a seismic isolation building 1 constructed by applying the construction method in the present embodiment. The seismic isolation building 1 has a structure in which an upper layer portion 4 and a lower layer portion 5 are positioned above and below a seismic isolation layer 3 having a seismic isolation device 2. Both the seismic isolation layer 3 and the lower layer part 5 are configured to be located in the ground G.
Further, as the pillars constituting the upper layer part 4 and the lower layer part 5, a structural pillar (column) 6 in which a lower end 6a is integrated with a foundation pile (foundation structure) 7 is used.
[0016]
FIG. 2 is an enlarged view of the seismic isolation layer 3 in the base isolation building 1 shown in FIG. As shown in the figure, the seismic isolation device 2 has a configuration in which a high-damping laminated rubber 9 is interposed between upper and lower base plates 8 and 8 fixed to an upper layer portion 4 and a lower layer portion 5 respectively. Further, seating columns 10, 10,... Are provided around the seismic isolation device 2. A plurality of sets of these seating columns 10 are provided, one set of which protrudes vertically from the lower surface 11a of the slab 11 of the upper layer portion 4 and the upper surface 5a of the lower layer portion 5 and whose tips 10a are arranged to face each other. . Such a seating column 10 prevents excessive deformation (sinking) from occurring in the upper layer portion 4 when the high-damping laminated rubber 9 is deteriorated in a fire or the like, and is deteriorated by the seating column 10. The axial force of the seismic isolation device 2 can be changed.
[0017]
Next, the construction method of this seismic isolation building 1 is demonstrated.
First, a mountain retaining wall (not shown) is provided so as to surround the installation target position of the seismic isolation building 1 in the ground G, and the foundation pile 7 is installed in the ground G inside the mountain retaining wall. Further, the frame pillar 6 is formed continuously with the upper portion of the foundation pile 7. In this case, the true pillar 6 is formed so that the upper end reaches the installation target position of the upper layer part 4.
[0018]
Subsequently, the slab 11 of the upper layer part 4 is formed at substantially the same position as the surface of the ground G. At this time, the slab 11 is formed in an integrated state with the structural pillar 6. As a result, the slab 11 and the upper layer part 4 are supported from the foundation pile 7 side via the structural pillar 6.
[0019]
Next, the ground G below the slab 11 is rooted. In this case, the slab 11 is used as a support for the earth pressure for holding the mountain retaining wall. Further, after excavating the space below the slab 11 to a certain depth, the upper surface 5a of the lower layer portion 5 is formed, and further, the lower layer portion 5 is formed in the ground G while excavating the lower portion. In this case, the upper surface 5 a of the lower layer part 5 is formed in a state of being integrated with the construction pillar 6. At the same time, as shown in FIG. 3, the seating column 10 is formed between the upper surface 5 a of the lower layer portion 5 and the lower surface 11 a of the slab 11 so as to be positioned around the construction column 6.
[0020]
Further, the seismic isolation device 2 is interposed between the upper surface 5 a of the formed lower layer portion 5 and the slab 11. For this purpose, first, as shown in FIG. 4, the lower surface 11a of the slab 11 and the upper surface 5a of the lower layer part 5 around the seating column 10 are added in the direction in which the seating columns 10 and 10 are separated from each other by the jack device 13. Liner plates 14 and 14 are respectively provided on the front end surfaces 10a and 10a of the seating columns 10 and 10 facing each other, and a resin material 15 made of an ultra-fast-strength epoxy resin is filled between the liner plates 14 and 14. .
[0021]
In this case, as shown in FIG. 5, a nichrome wire (heating wire) 16 is fixed to the liner plate 14, so that when the resin material 15 is cured, the nichrome wire 16 is placed inside the resin material 15. To be placed.
[0022]
When the resin material 15 is cured, as shown in FIG. 6, the jack device 13 is once removed, and a portion of the construction pillar 6 positioned between the upper surface 5 a of the lower layer portion 5 and the lower surface 11 a of the slab 11 ( That is, the part located in the seismic isolation layer 3 is cut and removed.
[0023]
Then, as shown in FIG. 7, a concrete base 18 is constructed at a location corresponding to a portion where the structural pillar 6 is installed in the upper surface 5 a of the lower layer portion 5. The base plate 8 is fixed.
[0024]
Further, as shown in FIG. 8, a reinforcing bar cage 19 is installed at a location corresponding to a portion of the lower surface 11 a of the slab 11 where the frame pillar 6 is installed, and the upper base plate is placed on the lower surface of the reinforcing bar cage 19. 8 is suspended and arranged. Then, the high damping laminated rubber 9 is installed between the upper and lower base plates 8, 8, and the high damping laminated rubber 9 is fixed to the upper and lower base plates 8, 8, and concrete is placed in the rebar cage 19, The installation of the seismic isolation device 2 is completed as shown in FIG.
[0025]
Then, as shown in FIG. 10, the jack device 13 is again arranged around the seating column 10, and the lower surface 11 a of the slab 11 and the lower surface 5 a of the lower layer part 5 are pressed away from each other. The line 16 is energized. Thereby, the heat generated from the nichrome wire 16 causes thermoplasticity in the resin material 15, and the resin material 15 is deteriorated. And the structure as shown in FIG. 2 is obtained by removing the resin material 15 which caused degradation in this way.
[0026]
Furthermore, the construction of the base layer 5 and the top layer part 4 is continued and completed, and the seismic isolation building 1 as shown in FIG. 1 is constructed by removing the retaining wall.
[0027]
In the construction method for the base-isolated building 1 described above, the resin material 15 is filled between the seating columns 10 and 10 provided in a protruding state from the upper layer portion 4 and the lower layer portion 5, and these seating columns 10 and 10 and The upper layer portion 4 is supported from the lower layer portion 5 side through the resin material 15, and further, the portion located in the seismic isolation layer 3 of the structural pillar 6 is removed, and the seismic isolation device 2 is interposed there. Since the structure is such that the resin material 15 is removed afterwards, unlike the conventional case, when temporarily receiving the upper layer portion 4 from the lower layer portion 5, there is a large-scale over the installation period of the seismic isolation device 2. A temporary receiving jig or the like is not required, which is advantageous in terms of workability and cost. Further, when temporarily receiving the upper layer portion 4 from the lower layer portion 5, the lower layer portion 5 and the upper layer portion 4 are fixed via the seating column 10 and the resin material 15. When an earthquake occurs, temporary seismic force treatment can be performed by the seating pillars 10 and the resin material 15, and safety is high.
[0028]
Moreover, in the construction method of the seismic isolation building 1 described above, since the nichrome wire 16 is disposed inside the resin material 15 when the resin material 15 is filled, the resin material 15 is removed when the resin material 15 is removed. Thermoplasticity can be generated and deteriorated in the material 15, thereby shortening and facilitating the removal work of the resin material 15.
[0029]
Furthermore, in the construction method of the seismic isolation building 1 described above, since the ultra-high-strength epoxy resin is used as the resin material 15, the resin material 15 can be cured at an early stage to exhibit a desired strength (for example, resin 3 hours after the injection of the material 15, about 30 N / mm ² ), it is possible to ensure the construction efficiency.
[0030]
In the above embodiment, other configurations may be adopted without departing from the spirit of the present invention.
For example, in the above-described embodiment, the seating column 10 is configured to protrude from both the upper layer portion 4 and the lower layer portion 5, but is not limited to this, and from one of the upper layer portion 4 or the lower layer portion 5 to the other. You may make it employ | adopt the structure from which the seating pillar 10 protrudes.
[0031]
Moreover, in the said embodiment, although the example in which the seismic isolation layer 3 was constructed | assembled in the 1st basement was demonstrated, it is the same also when not only this but the seismic isolation 3 is installed in the 2nd basement or more deeply. The construction method can be adopted.
[0032]
Moreover, in the said embodiment, although the example in the case of constructing the base-isolated building 1 by the reverse construction method was shown, in addition to this, when constructing the base-isolated building 1 by the forward construction method, You may make it employ | adopt the construction method like a form.
[0033]
【The invention's effect】
As explained above, in the construction method of the seismic isolation building according to claim 1, between the seating column provided in a protruding state from at least one of the upper layer portion and the lower layer portion toward the other and the other. Fill with resin material, support the upper layer part from the lower layer part side through the seating pillar and resin material, and then remove the part located in the seismic isolation layer of the column and seismic isolation there Because it is configured to interpose the device and then remove the resin material, unlike the conventional case, when temporarily receiving the upper layer portion from the lower layer portion, a large-scale temporary receiving jig or the like is not required. It is advantageous in terms of workability and cost. In addition, when temporarily receiving the upper layer from the lower layer, the lower layer and the upper layer are fixed via the seating pillar and the resin material, so that an earthquake occurs during the seismic isolation device installation work In addition, temporary seismic force treatment can be performed with these seating columns and resin material, and safety is high.
[0034]
In the construction method of the seismic isolation building according to claim 2, since the heating wire is arranged inside the resin material when the resin material is filled, the resin material is made thermoplastic when the resin material is removed. It can be generated and deteriorated, thereby shortening and facilitating the removal work of the resin material.
[0035]
In the construction method of the base-isolated building according to claim 3, since the ultra-high-strength epoxy resin is used as the resin material, the resin material can be cured at an early stage to exhibit a desired strength, and the construction efficiency is ensured. be able to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a base-isolated building to which a construction method of the present invention is applied.
FIG. 2 is an enlarged vertical sectional view of a base isolation layer of the base isolation building shown in FIG.
FIG. 3 is an enlarged vertical sectional view of a base isolation layer in a base isolation building showing one step of the construction method of the present invention.
4 is an enlarged vertical sectional view of the seismic isolation layer in the base isolation building showing the next step of FIG. 3. FIG.
FIG. 5 is a plan view of a liner plate used in the step shown in FIG.
6 is an enlarged vertical sectional view of the base isolation layer in the base isolation building showing the next step of FIG. 4;
7 is an enlarged vertical sectional view of the seismic isolation layer in the base isolation building showing the next step of FIG. 6. FIG.
FIG. 8 is an enlarged vertical sectional view of the seismic isolation layer in the base isolation building showing the next step of FIG. 7;
FIG. 9 is an enlarged vertical sectional view of the seismic isolation layer in the base isolation building showing the next step of FIG. 8;
10 is an enlarged vertical sectional view of the seismic isolation layer in the base isolation building showing the next step of FIG. 9. FIG.
[Explanation of symbols]
1 Seismic isolation building 2 Seismic isolation device 3 Seismic isolation layer 4 Upper layer 5 Lower layer 6 Construction pillar (pillar)
6a Lower end 7 Foundation pile (foundation structure)
8 Base plate 9 High damping laminated rubber 10 Seating column 15 Resin material 16 Nichrome wire (heat wire)
G ground

Claims (3)

A method for constructing a base-isolated building having a lower layer and an upper layer located above and below the base isolation layer,
In the ground at the position where the seismic isolation building is to be installed, a foundation structure for supporting the seismic isolation building is provided,
The pillar constituting the lower layer part is provided continuously with the foundation structure, and the pillar is formed so that at least the upper end thereof reaches the upper layer part,
Build the lower layer and upper layer in a state supported by the pillars,
At least one of the lower layer part and the upper layer part is provided with a seating pillar protruding toward the other in a state where it is located within the installation target position of the seismic isolation layer,
Between the seating column and the other of the lower layer part and the upper layer part, by filling a resin material, the upper layer part is supported from the lower layer part side via the resin material,
A method for constructing a seismic isolation building, comprising: removing a portion of the pillar located in the seismic isolation layer, interposing a seismic isolation device therein, and then removing the resin material. . A method for constructing a base-isolated building according to claim 1,
When filling the resin material, a heating wire is arranged inside the resin material, and the method for constructing a base-isolated building is characterized in that A construction method for a base-isolated building according to claim 1 or 2,
A method for constructing a base-isolated building, characterized in that an ultra-fast strength epoxy resin is used as the resin material.

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