JPH0510032Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention is used for a seismic isolation structure that absorbs seismic force when an earthquake occurs and prevents damage to the main body of the building as quickly as possible. More specifically, the present invention relates to a foundation structure equipped with a seismic isolation structure of the structure.

<Conventional technology> A seismic isolation device that deals with shaking of seismic isolation structures, especially lateral shaking, consists of a foundation part (lower foundation part) laid on the ground surface and a building body constructed on the foundation part. A system in which a laminated rubber material is interposed between the side base part (upper base part) is generally well known. In this method, if an earthquake occurs that may cause damage to the building, the rubber material will shift between its layers and absorb the seismic force, leaving the upper building unaffected. I'm trying to make sure it doesn't affect me.

By the way, as mentioned above, the seismic absorption displacement material, which is a laminated rubber material that absorbs seismic force and displaces, does not automatically return to its original state after the seismic force disappears, but remains in a displaced state (residual (transformation).
Therefore, after the earthquake has subsided, it is necessary to release this residual deformation and return the building body to its original position. On the other hand, when building such a seismic isolation structure, it is necessary to support the seismic isolation device so that it does not deform (move) during construction.

FIGS. 6A and 6B show a conventional method for restoring a building to its original position after an earthquake, in other words, restoring a seismic isolation device. First of all, as shown in Figure A,
A retaining wall 3 is installed on the outer periphery of the structure where the lower foundation 1 and the upper foundation 2 are located, and a jacking device 4 is interposed between the retaining wall and the upper foundation 2, and the jacking device 4 is installed when necessary. The device 4 is used to press the upper foundation, that is, the building body side, thereby restoring the earthquake absorbing displacement material R. As another method, as shown in FIG. There is a method of pulling the absorbing displacement material R back to its original state.

<Problems to be solved by the invention> The methods described above have no particular problems in terms of restoring the absorbing displacement material R, that is, returning the main body of the building to its original position, and to that extent, there are no problems in terms of work efficiency. Although it is effective, it has many practical problems in terms of structure, durability, etc.

In other words, in the former retaining wall jacking device method, in order to move the building body side, which is an extremely heavy object, it is necessary to construct a retaining wall that can withstand the reaction force of the pushing force, which is not directly related to the building configuration. Construction of the retaining wall will impose a considerable economic burden.
Additionally, effective placement of retaining walls sometimes interfered with the plan of the building itself.

On the other hand, in the latter method of using anchors, since the tensile force is directly applied to the anchor 5, it is necessary to give sufficient consideration in designing the strength, but depending on the dimensions of the footing, the anchorage length of the anchor bar may vary. In some cases, sufficient strength cannot be obtained, and there may be situations where the material cannot be used due to its yield strength. Furthermore, even if the anchoring length of the anchor bar is selected sufficiently, there is an inherent anxiety that if changes occur due to corrosion etc. over time, it may become unusable after all. The design had problems in terms of economy and labor, making it impractical.

The present invention was developed in view of the problems of the conventional technology as described above, and the basic structure is extremely simple in structure, has excellent durability, and can be easily and effectively operated. The purpose is to provide the following.

<Means for solving the problem> In order to achieve the above purpose, the present invention is designed to install a lower foundation laid on the ground surface and the foundation of a building built on top of it at appropriate intervals. In a seismic isolation structure in which seismic force absorbing displacement material is interposed between footings arranged facing each other, an insertion hole for an anchor bar to lock a required working member is formed between the side surfaces of the footings. .

<Function> When working to correct the misalignment between the building and the lower foundation after an earthquake and return the building to its original position,
The anchor bars of the required upper foundation footing and the footing adjacent to the footing of the lower foundation opposite to the footing, that is, diagonally opposite footings, are installed and fixed in the insertion holes, and the anchor bars are installed and fixed between the anchor bars. Tension jigs with turnbuckles, chain blocks, etc.
Generally, the wire members are locked and pulled together in the return direction. Furthermore, during construction of a building, a supporting material, such as a steel bar, is locked and fixed to an erected anchor bar between the diagonally opposing footings to prevent the seismic force absorbing displacement material from being inadvertently deformed during construction work.

<Example> A preferred example of the present invention will be described below based on the drawings.

FIG. 1 shows an embodiment of the present invention, and in the figure, 10 is a lower foundation part laid on the ground surface, and this foundation part requires upwardly convex footings 11 at appropriate intervals. A few have been formed. 12
is a building-side foundation (hereinafter referred to as "upper foundation") that will be the bottom of the main body of a structure such as a building, which is constructed on the lower foundation 10 via an earthquake force absorbing displacement material, which will be described later. In the portion 12, downwardly convex footings 13 are formed at intervals corresponding to the lower base footings 11. Therefore, the structure main body and the lower foundation are installed at positions where their respective footings face each other. R is an earthquake force absorbing displacement material made of laminated rubber or the like and interposed between the footings 11 and 13. 14 and 15
is a through hole formed in the footings 11 and 13 of the lower and upper base portions 10 and 12 between the side surfaces of the footings, and is used as an insertion hole for an anchor bar to be described later. However, the insertion holes 14 and 15 for the lever anchor bar are not provided at only one location between the opposing side surfaces, but are formed at several locations in one footing as required from orthogonal directions. Moreover, the insertion mounting hole 14,
As shown in FIGS. 2A and 2B as other examples, the holes 15 are not only horizontal as shown in FIG. You can. The insertion holes 14 and 15 are formed when the footing is formed.
It is formed by placing vinyl chloride pipes, steel pipes, etc. in accordance with the desired hole shape at the required locations, and pouring concrete.

In the present invention, as long as the hole shape is ensured, the tube material may be so-called buried after the hole is formed, or it may be pulled out using a release agent or the like like a straight tube and reused.

With the above-mentioned configuration, firstly, the work of restoring the building to its original position after an earthquake will be explained with reference to Figure 3. As shown in the figure, tensile members between the footings are prepared in advance as work members (tools) and attached. become. That is, the above-mentioned insertion mounting holes 14, 15
An anchor bar 16 made of a steel rod (for example, a bar shape with screws formed at both ends) having a length suitable for insertion is inserted into the mounting holes 14 and 15 and fixed. Next, in order to pull together the footing 11 of the lower foundation part 10 and the footing 13 of the upper foundation part 12 located diagonally opposite each other, an appropriate tension is applied between the anchor bars 16, 16 using a turnbuckle, a jacking device, a chain block, etc. A tension member consisting of a wire 18 equipped with an adjustment member 17 is locked and spanned, and the adjustment member 17 pulls the anchor bars 16, 16 via the wire 18, thereby fixing the footing 13.
By pulling in the required amount, the building body will return to its original position before the earthquake.

In this operation, the tensile force is applied to the respective footings 11, 13 via the anchor bars 16, 16.
It is necessary to prevent this local stress from occurring in the footings 11 and 13.
In other words, it is only necessary to distribute the load to the footing, and for that purpose, the anchor bar 16 and the footing 1
For example, an engaging jig having a shape as shown in FIG. 4A may be used for the engaging portions 1 and 13. The figure shows a jig used for the part where tensile force is directly applied to the side of the footing, but it does not have to have a special shape, and a flat plate can be used as a general shape for load distribution. Furthermore, although FIG. 4B shows the shape of a jig for connecting the wire 18 as a tension member and the anchor bar 16, the jig member only needs to have a connecting function. The connecting side may be formed into a U-shape or an eyebolt-like shape to provide a hook structure, and any suitable shape can be used.

Next, the anchor bar insertion holes 14 and 15 are
can be used to secure supporting materials during building construction.

Figure 5 shows an example of use during the above construction, in which the anchor bars 16 are inserted into the anchor bar insertion holes 14 and 15 of the required footings 11 and 13, similar to the above-mentioned installation of the tension member. After that, a supporting material 19 made of a steel bar (for example, a section steel) is spanned between diagonally opposing footings, and its end is secured to the anchor bar 16. During this work, the upper foundation part 12 is fixed to the lower foundation part 10 so that it will not shift during the construction work, so there is no directionality in erection like the above-mentioned tension member. For example, as shown in the figure, the upper foundation part 12
The footing 13 is fixed to the footing 13 from both opposing sides by supporting members 19, so to speak, in the form of support rods. In this case, the jig for engaging the supporting material 19 and the anchor bar 16 can have a jig shape as shown in FIG. 4B, for example, and does not require any special structure.

In addition, when the anchor bar insertion hole has a shape as shown in Fig. 2 A and B, in the case of Fig. 2 A, the connection form with the tension member or supporting material is linear, so for example, the anchor bar and the above member are connected in a straight line. It can be used as an integral part, and in the case of Figure B, especially when using a tension member, the tensile load is not generated only on the anchor bar engagement jig part as in the previous example, but on the footing and the anchor. The pull-out resistance of the bar can be used to reduce the load on the jig. In either case, commonly used members can be used for the anchor bar, tension member, and support jig.

<Effects of the invention> As explained in detail above, according to the invention, by simply forming an anchor bar insertion mounting hole in the footing, anchor bars, tension members, supporting materials, etc., can be easily installed when necessary. Since there is no need to provide working members in the footing, a very simple and economical basic structure can be achieved. This also prevents deformation and corrosion of the working members due to causes other than earthquakes, such as fire and water damage, and thus provides an extremely excellent practical effect of being maintenance-free.

Furthermore, since the above-mentioned working members only need to be able to draw or support each other using the above-mentioned mounting holes, they do not need to have a special configuration or structure, and may be used for molded steel, tension devices, etc. used in various other construction works. can be used, and does not require any effort in terms of component preparation.

Furthermore, according to the present invention, especially in tension work, the tension force can be transmitted as a compressive force from the footing surface mainly through the jig of the anchor bar engagement part, so it is possible to It also has the effect of obtaining a higher tensile strength than a structure in which transmission is achieved by pulling out a buried anchor bolt, and can provide unprecedented practical effects in terms of economy, workability, and durability.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the structure of the foundation according to an embodiment of the present invention, FIGS. 2A and B are explanatory diagrams showing the main parts of another embodiment of the present invention, and FIG. 3 is a building 4A is an explanatory diagram showing an example of an anchor bar locking tool, B is an explanatory diagram showing an example of a work member locking jig, and FIG. 5 is a diagram showing an example of a fixing of a foundation part during building construction. The work explanatory drawings and FIGS. 6A and 6B are schematic configuration diagrams showing conventional foundation parts, respectively. 10...Lower foundation part, 11, 13...Footing, 12...Upper foundation part, R...Earthquake force absorption displacement material, 14, 15...Insertion mounting hole, 16...Anchor bar.

Claims (1)

[Scope of Claim for Utility Model Registration] A lower foundation laid on the ground surface and a foundation of a building built on top of it are installed side by side at appropriate intervals,
In a seismic isolation structure in which seismic force absorbing displacement material is interposed between footings arranged in a convex shape facing each other, an insertion hole for an anchor bar to lock a required working member is formed between the side surfaces of the footings. The basic structure of the seismic isolation structure.