JP3906113B2 - Isolation device for building structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration isolator that is mounted between the foundation and the foundation of the building structure in the intermediate portion of the projecting and entering corners and the straight portion of the building structure such as a steel frame and a wooden house, and more particularly In order to reduce the vibration acting on the building during an earthquake, the building is isolated from the ground and installed as a cushion in the middle, and the strong horizontal acceleration acting on the building is suspended by the suspension shaft in the middle of the four corner columns The present invention relates to a vibration isolator for a building structure that can be significantly damped by the vibration damping function of a pendulum plate and can be absorbed by elastic members such as upper and lower disc springs of a suspension shaft against vertical vibration. Is.
[0002]
[Prior art]
At the Central Disaster Prevention Conference on April 23, 2002, 96 municipalities increased from Kanagawa Prefecture to Aichi Mie Prefecture in the east in Kanagawa Prefecture in preparation for the 8th grade of Magneto 8 Kanto Earthquake. In addition, an earthquake-proof diagnosis result was announced that the Japanese wooden house seismic reinforcement company cooperative had a risk of collapse of almost half of wooden houses in response to earthquakes with seismic intensity of 6 or less.
[0003]
With the revision of the Building Standards Act, earthquake resistance standards have been strengthened since 1981, but 63% of the houses built after that are at risk of collapse, and 60% of houses built before 80 are at risk of collapse. The result was announced.
[0004]
In the 1970s, rubber-isolated buildings with laminated rubber were constructed in France, South Africa, and New Zealand. In Japan, buildings that are safe against earthquakes are solidly fixed on a solid foundation. It was said to be a building, but in such a building, internal furniture, fixtures, etc. would fall, and the equipment would stop functioning.
[0005]
He experienced major earthquakes in the United States and Japan, and then started development. However, in order to build a base-isolated building in Japan, it must be examined by the Japan Building Center's Performance Evaluation Review Committee, and a review document and design document for the base-isolated building must be prepared and approved by the Minister of Construction. Don't be.
For this reason, it takes nearly six months and is required to maintain and manage the vibration isolation function sufficiently. In this way, the evaluation of the Japan Architecture Center is expensive, and the construction work is also expensive. The reality is that it takes a lot of money to apply to houses, and even if it is understood that the isolation structure is good, it is difficult to get out of hand.
[0006]
The usual seismic reinforcement is mostly due to the addition of walls and struts, reinforcement of pillars, etc., but these have problems such as the appearance of the corners changing and the usability of the room becoming very bad.
[0007]
Therefore, as a vibration isolator currently in practical use, as a device that uses laminated rubber for vibration isolation bearings, it is a heavy building such as a reinforced concrete building, such as a condominium, hospital, office building, public building, etc. Although there is a laminated rubber bearing system suitable for the above, there is no vibration isolation effect with respect to vertical vibration in this system.
[0008]
In addition, a lubrication roller and laminated rubber are placed on a flat plate, which is sandwiched between a concrete foundation and a building beam, so that the roller moves over the flat plate, and a sliding bearing that absorbs vertical vibrations with the laminated rubber. A rolling bearing system in which a large ball is placed on a shallow bowl-shaped base, a small bearing rolls on it, and an air spring is adjusted with a shock absorber, and a viscous foundation is placed in the concrete foundation. There is known a damper support system that uses a warp of the part that is fixed on the steel bar and that protrudes from the foundation. However, either of these systems requires frequent inspection and There were problems such as the need to replace the vibration member due to differential loss, elastic fatigue, and deterioration.
[0009]
[Problems to be solved by the invention]
The present invention has been made in view of such problems of the conventional technology, and its object is to use a strong horizontal acceleration speed during an earthquake without using laminated rubber or ball bearings as in the prior art. An object of the present invention is to provide a vibration isolator for a building structure that can greatly reduce vertical vibrations, minimize damage and body sensitivity of the building itself and equipment in the building, and provide a sense of security.
[0010]
[Means for Solving the Problems]
For this purpose, the invention according to claim 1 is mounted between the foundation 3 and the foundation 41 of the building structure at the intermediate and intermediate corners of the projecting and entering corners and straight portions of the building structures such as steel frames and wooden houses. A vibration isolator,
A substrate 1 fixed on the foundation 3;
Four struts 4 erected at the four corners on the substrate 1, and
The center portion has a large-diameter opening hole 8 and the four side center portions each have a substantially C-shaped countersink 9, and are fixed horizontally to the upper end portions of the four columns 4 and the fixing plate 6;
At the four corners, there are a substantially C-shaped countersink 9 and a substantially C-shaped countersink 29 symmetrical to the fixing plate 6, and four substantially C-shaped countersinks of these four approximately C-shaped countersinks 29 and the fixing plate 6. A pendulum plate 27 that is swingably suspended below the fixed plate 6 by four suspension shafts 17 respectively inserted through the countersinks 9;
Each of the fixed plate 6 and the substantially plate-shaped countersunk hole 9 of the fixed plate 6 and the substantially circular plate-shaped countersink 29 of the pendulum plate 27 communicate with the spherical base 12 and the substantially flat plate-shaped countersink 13. A fixed base 11 that is fixedly inserted through the suspension shaft 17 into the upper surface of each of the approximately C-shaped countersink holes 9 and the lower surface of each of the approximately C-shaped countersink holes 29 of the pendulum plate 27;
The substantially plate-shaped countersink 9 and the pendulum plate 27 of the fixing plate 6 and the pendulum plate 27 are integrally formed with a spherical pedestal portion 16 communicating with the plate-shaped countersink 29 and a substantially C-shaped countersink 15. The slide base 14 is provided so as to be slidable through the suspension shafts 17 inserted into the lower surface of each of the approximately C-shaped countersink holes 9 and the upper surface of each of the approximately C-shaped countersink holes 29 of the pendulum plate 27. When,
The pendulum plate 27 is brought into spherical contact with the spherical pedestal portions 12 of the fixed pedestals 11 on the upper surface of the fixed plate 6 and the spherical pedestal portions 12 of the fixed pedestals 11 on the lower surface of the pendulum plate 27, respectively. Upper and lower spherical plain bearings 18 inserted into the upper and lower ends of the suspension shafts 17 so as to face each other,
The spherical base portions 16 of the sliding bases 14 on the lower surface of the fixed plate 6 and the spherical base portions 16 of the sliding bases 14 on the upper surface of the pendulum plate 27 are in spherical contact with the pendulum plates. 27, the upper and lower spherical plain bearings are mounted on the respective suspension shafts 17 so as to face the respective spherical plain bearings 18 and in a vertically symmetrical relationship with the respective elastic members 25 such as disc springs. 22,
A center column 30 erected at the center of the pendulum plate 27 with its upper end protruding slightly above the opening 8 of the fixed plate 6;
A base support plate 37 provided on the upper end of the center column 30 via a coaxially connected adjustment bolt 32 so as to be adjustable in height;
The substrate 1 is fixed on the foundation 3 with anchor bolts or the like, and a base 41 of the building structure is placed and fixed on the base receiving plate 37 via an H-shaped steel 40, and set.
In the event of an earthquake, strong horizontal acceleration acting on the building structure is isolated by the vibration damping function of the pendulum plate 27 of the pendulum structure suspended by the four pendulum plate suspension shafts 17, resulting in vertical vibrations. On the other hand, a building structure vibration isolator characterized in that the elastic member 25 absorbs the structure.
[0011]
The invention according to claim 2 is characterized in that the four struts 4 are integrally provided with the reinforcing rib 5 and the center strut 30 is integrally provided with the reinforcing rib 31, respectively.
[0012]
[0013]
[0014]
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described together with its operation with reference to the drawings.
FIG. 1 is a front view showing a part of an example of a vibration isolator for a building structure according to the present invention, and FIG. 2 is a front view showing an operation state with a part omitted and shown. In the figure, the apparatus includes a substrate, a fixed plate , four pendulum plate suspension shafts, a pendulum plate, a base receiving plate, and the like.
[0016]
The substrate 1 is a rectangular plate-shaped body made of a steel plate, and the substrate 1 is placed and fixed on a foundation 3 such as a corner of a building structure with a plurality of anchor bolts 2 when the whole is set. It is.
[0017]
At the four corners of the substrate 1, four steel bar columns 4 are erected, and the four columns 4 are reinforced by reinforcing ribs 5 of a plurality of triangular plates welded to the four columns 4. The fixing plate 6 is fixed by a nut 7 in a horizontal state.
[0018]
The fixing plate 6 is a rectangular plate-shaped body made of a steel plate, and has a large-diameter opening hole 8 at the central portion, and has a substantially C-shaped countersink at the central portion of the four sides as shown in FIG. 9 is drilled with the hole angle preferably 36 degrees.
[0019]
As shown in FIGS. 1 and 8, pedestal fitting frame fittings 10 are welded to the upper surfaces of the substantially C-shaped countersink holes 9 in the fixing plate 6, respectively. with a fixed base 11 having a spherical seat 12 and upward toward the inner edge 26b thereof shaped countersink 13 which is shown is fitted and fixed respectively on the lower surface of each upward toward the inner edge 26b thereof shaped countersink 9 in the fixed plate 6, shown in Figure 10 as such, the sliding base 14 are respectively slidably with upward toward the inner edge 26b thereof shaped countersink 16 continuous with the reverse c-shaped countersink 15 and the upward toward the inner edge 26b thereof shaped countersink 15 substantially integrally.
[0020]
The upward toward the inner edge 26b thereof shaped countersink 9 of the fixed plate 6, the pendulum plate suspending shaft 17 respectively is inserted through the upward toward the inner edge 26b thereof shaped countersink 13 and upward toward the inner edge 26b thereof shaped countersink 15 and 16 of the sliding base 14 of the fixing base 11, fixed base A spherical sliding bearing 18 and a washer 19 that are in spherical contact with the spherical pedestal portion 12 are screwed onto the shaft portion protruding from 11 and are double-fastened by U-nuts 20 and 21 with locking prevention.
[0021]
A spherical plain bearing 22 that is in spherical contact with the slide base 14 is attached to and attached to the shaft portion on the lower surface side of the fixed plate 6 in each pendulum plate suspension shaft 17, and the flange portion 23 and the spherical surface of the spherical plain bearing 22 are attached. An elastic member 25 such as a disc spring is held between the slide bearing 22 and a disc spring guide 24 inserted into the suspension shaft 17 and attached to the suspension shaft 17. The disc spring guide 24, the elastic member 25, the spherical plain bearing 22, The slide base 14 is attached in series by a nut 26 fastened to the suspension shaft 17, and the elastic force of the elastic member 25 can be arbitrarily adjusted via the disc spring guide 24 by the tightening force of the nut 26.
[0022]
The contact surfaces of the fixed pedestal 11 and the spherical plain bearing 18 and the sliding pedestal 14 and the spherical plain bearing 22 are subjected to high-frequency quenching and are in close contact with each other, so that dust or dust may enter or rust. Absent.
[0023]
A pendulum plate 27 is horizontally attached to the lower ends of the four pendulum plate suspension shafts 17 that are suspended from the fixed plate 6.
[0024]
The pendulum plate 27 is made of a steel plate. As shown in FIGS. 5 and 6, the pendulum plate 27 has an arc-shaped cut portion 28 with a predetermined radius at the center of the four sides, and the fixed plate 6 at the four corners. And a substantially inverted C-shaped countersink 29 which is symmetrical with the substantially C-shaped countersink 9 in FIG.
[0025]
The site of each upward toward the inner edge 26b thereof shaped countersink 29 in the bottom surface of the pendulum plate 27, fixed to the same pedestal fitting frame fitting 10 and the pedestal fitting frame fitting 10 described above with the fixing base 11 and the slide base 14 pedestal 11 and the sliding base 14 Are provided in a symmetrical relationship with the case of the fixed plate 6.
[0026]
Therefore, these constituent members are given the same numerals as the base fitting frame metal fitting 10, the fixed base 11, and the sliding base 14, and the description of the configuration thereof is omitted.
[0027]
Further, on the upper surface of the lower part and the pendulum plate 27 of each pendulum plate suspending shaft 17 across the pendulum plate 27 across the fixed plate 6 described above an upper end of the pendulum plate suspending shaft 17 lower surface of the fixed plate 6 The spherical plain bearing 18 provided on the side, the washer 19, U-nuts 20 and 21 with loosening prevention, the spherical plain bearing 22, and the flange part 23 of the spherical plain bearing 22 and the disc spring guide 24 are elastically supported. The same spherical plain bearing as the elastic member 25, washer, U-nut with locking prevention, spherical plain bearing, elastic member such as a disc spring provided between the flange of the spherical plain bearing and the disc spring guide, and nut Are provided in a symmetrical relationship with the case of the upper fixing plate 6.
[0028]
Therefore, the spherical sliding bearing 18, washer 19, U nuts 20 and 21 with locking, spherical sliding bearing 22, collar portion 23, disc spring guide 24, elastic member 25 such as a disc spring, nut 26, etc. Only the same numerals are given, and the description of the configuration is omitted.
[0029]
A central portion of the pendulum plate 27 is reinforced by a plurality of triangular rib reinforcing ribs 31 to which a single center column 30 is welded, and an upper end thereof is slightly above the opening hole 8 of the fixed plate 6. A base plate for the building structure is provided on the upper end thereof via an adjustment bolt 32.
[0030]
As shown in FIG. 13, the adjustment bolt 32 is used to hang a wrench formed by cutting both surfaces of a portion sandwiching the upper screw portion 33, the lower screw portion 34, and the upper and lower screw portions 33, 34 into a flat surface. The adjustment bolt 32 has a lower screw portion 34 that is coaxially screwed into the upper end bolt hole of the center column 30 via a nut 36 and an upper screw portion 33 of the adjustment bolt 32. A base plate 37 of the building structure is attached to the.
[0031]
The base receiving plate 37 has an octagonal shape in which four corners of a square steel plate are cut off, and has a recessed portion 38 and a bolt hole at the center, and the base receiving plate 37 has an adjustment bolt through the bolt hole. It is attached to the upper threaded portion 33 of 32, and is fixed by fastening the nut 39 in the recessed portion 38 after the height has been adjusted.
[0032]
An H-section steel 40 is placed and fixed on the base support plate 37, and a foundation 41 of a building structure is placed and fixed on the H-section steel 40.
[0033]
Further, at the four corners the upper surface of the fixed plate 6, the head portion (pedestal fitting frame fitting 10 of the fixed plate 6 hanging pendulum plate coming out on shaft 17, the fixing base 11, a spherical plain bearing 18 includes a nut 20, 21 ) Is provided.
[0034]
Next, the operation of this apparatus will be described.
As shown in FIG. 1, this apparatus is placed on a foundation 3 provided at regular intervals in the intermediate and intermediate corners of a building structure such as a steel frame or a wooden house. Then, it is fixed by driving a plurality of anchor bolts 2 to the base plate 1 and the foundation 3, and an H-section steel 40 is placed and fixed on the base support plate 37. A base 41 of the building structure is mounted on the H-section steel 40. Is fixed.
[0035]
When the device is set, in order to prevent the pendulum plate 27 from easily rolling due to strong winds, the elastic members 25 such as a pair of disc springs provided above and below the pendulum plate suspension shafts 17 The force is appropriately adjusted and set by tightening the nut 26.
[0036]
In a normal time without an earthquake, as shown in FIG. 1, the four pendulum plate suspension shafts 17 and the center column 30 are in an upright state, and the center column 30 is a central part of the opening hole 8 of the fixed plate 6. Is located.
[0037]
In the event of an earthquake, first, when swinging in the right direction in FIG. 1, as shown in FIG. 2, the spherical sliding bearings 18 and 22 are fixed to the upper and lower portions of each pendulum plate suspension shaft 17. while spherical contact with the sliding seat 14, and moves within the upward toward the inner edge 26b thereof shaped countersink 9 and 29 while sliding the slide base 14 in the vertical opposite directions, the shaft 17 hanging each pendulum plate obliquely parallel state In conjunction with this, the pendulum plate 27 moves from the imaginary line position to the solid line position, the center column 30 moves in the opening hole 8 of the fixed plate 6, and the H-shaped steel 40 is placed on the base receiving plate 37. The mounting base 41 moves horizontally from the imaginary line position to the solid line position (right direction).
[0038]
When the swing changes from the right direction to the left direction, the pendulum plate 27 and the base 41 move horizontally in the left direction by the reverse movement of the right direction.
[0039]
In this way, the strong horizontal acceleration (swaying in the left-right direction) acting on the building is greatly attenuated by the vibration damping function of the pendulum plate 27 suspended by the four pendulum plate suspension shafts 17 and the vertical vibrations. Is absorbed by an elastic member 25 such as a disc spring provided at the upper and lower portions of each pendulum plate suspension shaft 17.
[0040]
By the way, when the amplitude is within 72 degrees (30 mm on the left and right), there is no sense of comfort, but the size and length of the components such as the pendulum plate suspension shaft 17 are calculated according to the size and structure of the building and the floor load. Depending on the size of the device, the amplitude can be changed.
[0041]
【The invention's effect】
Thus, according to the present invention, since the foundation of the building structure is placed and fixed on the foundation support plate of the center column on the pendulum plate having the pendulum structure, the vibration applied to the building structure is always constant. It is kept and does not synchronize with the shaking of the earthquake. Therefore, the earthquake load of the building structure can be greatly reduced, and the safety of the building structure during an earthquake is improved.
[0042]
As described above, the safety of the building structure at the time of the earthquake is improved, and as a derivative effect, the fall of the contents such as furniture and furniture is prevented, and secondary damage is prevented. In addition, as a result of increasing the earthquake resistance and safety of the building, damage to the exterior and waterproofing is prevented, which helps to prevent fear and injury during an earthquake and gives people a sense of security.
[0043]
In addition to protecting human life, it is possible to preserve property and secure building functions, and it is possible to eliminate psychological anxiety and discomfort by reducing the sensation of earthquakes and to improve safety and living feeling.
[0044]
Further, since the seismic force acting on the building is reduced, the building members are reduced, and the number of seismic elements is reduced, thereby making it possible to create a large space.
[0045]
Further, the present invention can be widely implemented not only as a vibration-isolated building but also as a vibration-isolating floor for an existing building and as a device for isolating only necessary parts such as a display case of a museum.
[Brief description of the drawings]
FIG. 1 is a front view showing a cross section of a part of an example of a vibration isolator for a building structure according to the present invention.
FIG. 2 is a front view of an operation state in which a part is omitted and shown in cross section.
FIG. 3 is a plan view of an upper fixing plate.
4 is an enlarged cross-sectional view taken along line 4-4 of FIG.
FIG. 5 is a plan view of a pendulum plate.
6 is an enlarged cross-sectional view taken along line 6-6 of FIG.
7 is a partially enlarged cross-sectional view showing a mounting structure between an upper fixing plate and a pendulum plate suspension shaft in FIG. 1. FIG.
FIG. 8 is a partially omitted enlarged cross-sectional view showing a mounting structure of the upper fixing base with respect to the upper fixing plate.
FIG. 9 is an enlarged sectional view of the upper fixed base.
FIG. 10 is an enlarged sectional view of a lower slide base.
FIG. 11 is an enlarged cross-sectional view of a spherical plain bearing.
12 is a partially enlarged cross-sectional view showing a mounting structure between the pendulum plate and the pendulum plate suspension shaft in FIG. 1; FIG.
FIG. 13 is an enlarged front view of an adjustment bolt.
[Explanation of symbols]
1 board 3 foundation 4 support
5 Reinforcement rib 6 Fixing plate 8 Opening hole 9 Substantially C-shaped countersink 11 Fixing base
12 spherical pedestal part 13 substantially C-shaped countersink 14 sliding pedestal
15, 16 substantially C-shaped countersink 17 pendulum plate suspension shaft 18 spherical plain bearing 22 spherical plain bearing 25 elastic member 27 pendulum plate
29 C-shaped countersink 30 Center support
31 Reinforcing rib 32 Adjustment bolt 37 Base plate 40 H-section steel 41 Base

Claims (2)

A vibration isolator that is mounted between the foundation (3) and the foundation (41) of the building structure in the intermediate part of the corner of the building structure such as a steel frame and a wooden house, and the corner of the corner.
A substrate (1) secured on said foundation (3);
Four struts (4) erected at the four corners on the substrate (1);
The central part has a large-diameter opening hole (8), and the central part of each of the four sides has a substantially C-shaped countersink hole (9), which is horizontally fixed and fixed to the upper ends of the four columns (4). A plate (6);
At the four corners, there are a substantially C-shaped countersink (9) of the fixing plate (6) and a symmetric substantially C-shaped countersink (29), and the four substantially C-shaped countersinks (29) and the fixing are provided. A pendulum plate (27) suspended swingably below the fixed plate (6) by four suspension shafts (17) respectively inserted through four substantially C-shaped countersink holes (9) of the plate (6). )When,
A spherical base portion (12) communicating with each substantially C-shaped countersink (9) of the fixing plate (6) and each substantially C-shaped countersink (29) of the pendulum plate (27) and a substantially C-shaped countersink (13 ) And the upper surface of each of the approximately C-shaped countersink holes (9) in the fixing plate (6) and the lower surface of each of the approximately C-shaped countersink holes (29) in the pendulum plate (27), respectively. A fixed base (11) fixedly inserted through the suspension shaft (17);
A spherical base portion (16) communicating with each substantially C-shaped countersink (9) of the fixing plate (6) and each substantially C-shaped countersink (29) of the pendulum plate (27) and a substantially C-shaped countersink (15 ) And the lower surface of each of the substantially C-shaped countersink holes (9) in the fixed plate (6) and the upper surface of each of the approximately C-shaped countersink holes (29) in the pendulum plate (27), respectively. A sliding base (14) provided so as to be slidable through the suspension shafts (17);
The spherical pedestals (12) of the fixed pedestals (11) on the upper surface of the fixed plate (6) and the spherical pedestals (12) of the fixed pedestals (11) on the lower surface of the pendulum plate (27). And upper and lower spherical plain bearings (18) respectively inserted into the upper and lower ends of the suspension shafts (17) so as to swing the pendulum plate (27) in spherical contact with each other,
Each spherical pedestal portion (16) of each sliding pedestal (14) on the lower surface of the fixed plate (6) and each spherical pedestal portion (14) on each sliding pedestal (14) on the upper surface of the pendulum plate (27). 16) in contact with each spherical surface to swing the pendulum plate (27), each suspension shaft (17) is opposed to each spherical sliding bearing (18), and each disk spring, etc. Upper and lower spherical plain bearings (22) inserted in a vertically symmetrical relationship with the elastic member (25);
A center column (30) erected at a central portion on the pendulum plate (27) with an upper end projecting slightly above the opening hole (8) of the fixed plate (6);
A base support plate (37) provided on the upper end of the center column (30) so as to be adjustable in height via an adjustment bolt (32) connected coaxially;
The substrate (1) is fixed on the foundation (3) with anchor bolts or the like, and the foundation (41) of the building structure is mounted on the foundation receiving plate (37) via an H-shaped steel (40). Set in place,
When an earthquake occurs, strong horizontal acceleration acting on the building structure is isolated by the vibration damping function of the pendulum plate (27) of the pendulum structure suspended by the four pendulum plate suspension shafts (17) , A vibration isolator for a building structure, characterized in that the elastic member (25) absorbs up and down vibrations. The four struts (4) are provided integrally with reinforcing ribs (5), and the center strut (30) is provided integrally with reinforcing ribs (31), respectively. Isolation device.

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