JP2004011164A - Wind shaking preventive device for building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wind shaking preventive device capable of surely preventing the shaking of a building by wind with a simple structure, and never impairing the base isolating performance to minor earthquake in the application to a base isolation structure. <P>SOLUTION: A locking hole 3 is fixed to one of the upper surface side of a foundation A and the lower surface of a building B, and a hydraulic cylinder 11 for protruding a piston rod 14 outwardly is fixed to the other, so that the hydraulic pressure in a hydraulic cylinder chamber 12 can be automatically released, in conformation to the wind pressure received by one side surface of the building through a pressure guide pipe 21, by fitting the piston rod 14 into the locking hole 3, when the internal pressure is increased by a fixed limit or more, to reduce the internal pressure. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
Field of application of the invention
The present invention relates to a wind sway prevention device for a building, and more particularly to a wind sway prevention device for a seismic isolation structure.
[0002]
[Prior art]
Buildings with a large wind receiving area, such as high-rise buildings and plate-like buildings, have the inconvenience of swaying and receiving discomfort to residents when exposed to strong winds, especially when supported by seismic isolation devices with low horizontal rigidity. May have a large swing width, and large residual deformation may remain.
[0003]
The following are known as wind sway prevention devices for such seismic isolation structures.
{Circle around (1)} An engagement disengaged when an engagement protrusion on the base side engaged with the lower surface of the structure to prevent wind sway is damaged by a seismic force exceeding a certain value and is damaged (Japanese Patent Laid-Open No. 8-284115)
(2) By forming a sliding surface for sliding contact at the time of seismic motion around the part of the lower surface of the sliding type seismic isolation structure that constantly contacts the upper surface of the bearing device, it is possible to maintain the seismic isolation performance against earthquake Resisting wind sway (JP-A-2000-74138)
{Circle over (3)} Seismic motion is detected by using a seismic ball or an electric detecting means, and a lock for preventing wind sway between a foundation and a building on the foundation is released in the event of an earthquake (Japanese Patent Laid-Open No. 2000-038858, Japanese Patent Laid-Open No. -288242)
{Circle around (4)} Locking a foundation and a building on the foundation in strong winds using electric wind sensing means (Japanese Patent Laid-Open No. 2001-12108)
[0004]
[Problems to be solved by the invention]
Among the above prior arts, in the devices of the above (1) and (2) which oppose seismic force within a certain limit by mechanical engagement force or frictional force, the building is securely fastened to the foundation within the limit. And can hardly perform the seismic isolation function for small and medium earthquakes.
[0005]
Further, the above-mentioned devices (3) and (4) using a seismic ball or an electric detecting means have a possibility of malfunction due to their complicated structure, and require a long maintenance.
[0006]
The present invention provides a wind sway prevention device that can reliably prevent wind sway of a building with a simple configuration and that does not impair seismic isolation performance against a small or medium-sized earthquake when used in a seismic isolation structure. The purpose is to:
[0007]
[Means for Solving the Problems]
The first means is a hydraulic cylinder 11 having a locking hole 3 on one of the upper surface side of the foundation A and the lower surface side of the building B constructed on the foundation, and a hydraulic cylinder 11 projecting a piston rod 14 outward on the other. Are fixed to each other, and the hydraulic pressure in the hydraulic cylinder chamber 12 is made to correspond to the wind pressure received on one side of the building via the pressure guiding tube 21. When the internal pressure increases by a certain limit or more, the piston rod 14 is provided so as to be fitted into the above-mentioned locking hole 3 and to be able to be automatically taken out by reducing the internal pressure.
[0008]
The second means includes the first means, and the throttle valve 21 is provided in the pressure guiding tube 21.
[0009]
The third means has the first means or the second means, and the hydraulic cylinder 11 is a reciprocating cylinder which projects the piston rods 14 and 14 outward from both surfaces of the piston 13, respectively. The respective liquid pressures in the hydraulic cylinder chambers 12 on both sides are made to correspond to the respective wind pressures at two measurement points on the leeward and leeward sides of the building via the pressure guiding tubes 21 and 21, respectively. Holes 3, 3 as a pair
When the pressure difference between the two measurement points is equal to or greater than a certain limit, one of the two piston rods 14 is formed so as to be able to fit into the one locking hole 3.
[0010]
The fourth means has the first means, the second means, or the third means, and is provided at a plurality of locations on the lower surface of the building B which are symmetric with respect to the center of gravity G of the building. The locking holes 3 and the hydraulic cylinders 11 are provided, respectively, and the pressure guiding pipes 21 are piped into the hydraulic cylinder chambers 12 so as to introduce wind pressure received by the building B from the same direction.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 3 show a first embodiment of the present invention. In the figure, A is a foundation, and a building B is supported on the foundation via a seismic isolation device C.
[0012]
A building wind sway prevention device 1 is provided between the upper surface of the foundation A and the lower surface of the building B. In the example shown in the drawing, the device is provided with a receiving member 2 fixed on the upper surface of the foundation A and a building. The hydraulic cylinders 11 and 11 are fixed to the lower surface of B.
[0013]
The receiving member 2 is formed by forming a pair of left and right locking holes 3, 3 on the upper surface of a block having sufficient strength to withstand wind pressure. The receiving members may be omitted, and the locking holes 3 and 3 may be formed directly on the upper surface of the foundation A.
[0014]
Each of the hydraulic cylinders 11 is a single-acting type in which a piston rod 14 is suspended from a piston 13 which rises and descends in a cylinder cylinder having a crest and an opening at a lower surface. They are arranged to fit into the locking holes 3, 3. The piston 13 is biased upwardly by a spring 15 illustrated example, also the hydraulic cylinder chamber is defined in said piston upper 12, to the building right and left side walls B ₂ drilled into the receiving hole 22 The air pressure to be blown in is formed so as to be introduced through the pressure guiding tube 21. The pressure guiding tube is filled with a liquid (for example, water) having an appropriate specific gravity except for the upper end side.
[0015]
It is to be noted that the receiving member 2 may be fixed to the lower surface side of the building B, and the hydraulic cylinders 11 and 11 may be fixed to the upper surface side of the foundation A, unlike the above-described example.
[0016]
The apparatus of the present embodiment has a pair of locking holes 3, a hydraulic cylinder 11, and a pressure guiding tube 21 on each of the left and right sides as shown in FIGS. 1 and 3. It may be omitted.
[0017]
In the above configuration, for example, when the wind blows as shown by an arrow in FIG. 2, the wind pressure received by the building B on the windward (left side in the illustrated example) outer surface corresponds to the one-sided liquid corresponding to the positive pressure by the windward impulse line 21 a. The pressure is transmitted into the pressure cylinder chamber 12a, and when the pressure reaches a certain level or more, the piston rod 14a is lowered and fitted into the locking hole 3, thereby preventing the building B from rolling. According to the drawing, the other piston rod 14b rises in conjunction with the lowering of the one piston rod 14a, but this is caused by the negative pressure generated on the leeward side of the building via the leeward side impulse line 21b. This is because it is transmitted to the cylinder chamber 12b.
[0018]
When the wind stops, the positive pressure is released, and the piston 13 and the piston rod 14 return to the original positions shown in FIG. 1 by the spring force.
[0019]
FIG. 4 is a first example of the present embodiment, and shows a suitable installation example of the wind sway prevention device as a bottom view of a building B. For example, when the apparatus of the present invention shown in FIG. 3 is provided at one position of the center of gravity G of the building, depending on the direction of the wind hitting the building, the building may be twisted on a horizontal plane as drawn by imaginary lines in FIG. Exercise. In order to prevent this torsional movement, in this modification, a pair of wind sway prevention devices 1x are provided at front and rear or left and right symmetrical positions with respect to the center of gravity G of the building (four corners and center position of the bottom in the illustrated example). , 1y. However, the wind sway prevention device near the center of gravity G is drawn at a position slightly deviated from the center of gravity for the convenience of drawing. The wind sway prevention device 1x is provided with a pressure guiding tube 21 so as to operate corresponding to the wind pressure X in the left and right direction, and the wind sway prevention device 1y is provided with a pressure guiding tube 21 so as to operate corresponding to the wind pressure in the front and rear direction Y. The piping of the equipment near the four corners of the bottom of the building is partially omitted.
[0020]
FIG. 5 shows a second modified example of the present embodiment, in which four hydraulic cylinders 11 which operate in response to wind pressures applied to the front, rear, left and right surfaces of the building B and corresponding locking holes 3. Are arranged close to each other to constitute one wind sway prevention device.
[0021]
FIG. 6 shows a third modification of the present embodiment, in which a well-known throttle valve 24 for reducing the cross-sectional area (flow path area) and controlling the flow rate is provided in the middle of each pressure guiding tube 21.
[0022]
Hereinafter, a second embodiment and a third embodiment of the present invention will be described. At this time, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0023]
FIG. 7 shows a second embodiment of the present invention.
[0024]
In this embodiment, the receiving member 2 is formed in a U-shape in vertical section having a fitting groove 5 having an open side surface, and locking holes 3 and 3 are respectively formed in outer portions of upper and lower side surfaces of the fitting groove. I have.
[0025]
In addition, a support member 18 having an L-shaped vertical section is provided so as to protrude from the lower surface of the building B, and a horizontal portion of the support member is loosely fitted into the fitting groove 5 and a front end surface of the horizontal portion. Is fixed to a return-type vertical hydraulic cylinder 11. In this backward-acting vertical hydraulic cylinder, piston rods 14, 14 are projected from above and below a piston 13 provided in an intermediate portion of the cylinder, and locking holes 3, 3 are provided on extensions of the piston rods.
[0026]
Hydraulic cylinder chamber 12d provided on both upper and lower sides of the piston 13, 12c is pressure holes 22 and 22 respectively provided in the building right and left side walls _{B 2} via a pair of impulse lines 21b, 21a through the interior of the said support member 18 Is communicated with. Further, the liquid level in the pressure guiding tube 21a (in the illustrated example, the left pressure guiding tube) communicating with the hydraulic cylinder chamber 12c below the piston is set to be ΔH higher than the liquid level in the other pressure guiding tube 21b. 13 and the piston rods 14 and 14 are preferably provided to support the weight.
[0027]
8 to 10 show a third embodiment of the present invention. In this embodiment, the vertical hydraulic cylinder 11 of the second embodiment is made horizontal, and piston rods 14, 14 projecting from the horizontal hydraulic cylinder to the left and right are fitted into the locking holes 3, 3 when the building receives wind. The receiving members 2 and 2 are arranged so that they can be combined with each other, and at the same time, when the piston rod 14 enters the locking hole 3 during an earthquake as described later, the seismic isolation is performed in a direction orthogonal to the rod axis. The configuration is such that the inconvenience that the device C does not work is avoided.
[0028]
For convenience of explanation, first, of the structure of the apparatus according to the present embodiment, a part mainly related to wind sway prevention of a building will be described. In the illustrated example, the horizontal hydraulic cylinder 11 includes a pair of upper and lower protection plates 16. , 16 and is fixed to the lower surface of the building B via the upper protection plate 16. Further, from a pair of left and right cylinder chambers 12, 12 partitioned by the piston 13, pressure guiding tubes 21, 21 respectively extend in opposite directions, as shown in FIG. 9, and the front and rear walls B ₃ , B _{4 of the} building It is open to.
[0029]
Outside the left and right ends of the hydraulic cylinder 11, receiving members 2, 2 having locking holes 3, 3 on the inner surface in the left-right direction are arranged. The receiving member is provided at least immovably in the front-rear direction with respect to the foundation A (in the illustrated example, via a guide rail to be described later). At this time, the piston 13 moves rightward or leftward, and one of the left and right piston rods 14, 14 is fitted into one of the locking holes 3, 3 as shown by the imaginary line in FIG. Prevent wind sway.
[0030]
However, assuming that the piston 13 is slidable left and right, in an actual earthquake that includes irregularly forward and backward and left and right vibration components, the left and right components of the vibration cause the piston rod 14 to enter the locking hole 3, and these piston rods In addition, the locking hole may be temporarily locked in the front-rear direction, and the seismic isolation device may not function for the front-rear component of the vibration.
[0031]
In order to avoid such inconvenience, the device of the present embodiment further has the following configuration.
[0032]
That is, a pair of left and right horizontal substrates 32, 32 are fixed on the base A, and a long guide rail 33 is fixed on both substrates in the left-right direction, and the receiving member is provided between both front and rear surfaces of the guide rail. 2 are slidable in the left-right direction and straddled so that it cannot be pulled out upward. In the example shown in the drawing, elongate plate-like restraining members 35, 35 are erected from the horizontal bases 32, 32 in the lateral direction outside of the base portion, and the inner surface of the restraining plate and the outer surface of the receiving member 2 are interposed via a spring 36. Connected.
[0033]
The left and right ends of the protection plates 16 and 16 serve as buffering portions and spacers 17 for the receiving member 2 and have a projection length substantially the same as that of the piston rod 14 outwardly from the left and right end surfaces of the liquid cylinder 11. It is made to protrude.
[0034]
According to the above configuration, at the time of the earthquake shown in FIG. 10, the spacer 17 abuts against one of the receiving members 2 and 2 to retreat the receiving member outward and laterally against the left and right components of the seismic motion. 14 is prevented from entering the locking holes 3, 3, so that the seismic isolation device C can be reliably operated.
[0035]
In the illustrated example, the guide device 31 that guides the receiving member 2 by the guide rail 33 and the horizontal substrate 32 is configured. However, the guide device 31 is not necessarily required to have the configuration, and is perpendicular to the direction in which the receiving member is guided. Any guide device may be used as long as it can support with sufficient strength against a strong wind pressure. In addition, the spacers 17, 17 need not necessarily be part of the protection plate 16, and one of the spacers can be omitted.
[0036]
【The invention's effect】
The present invention has the above configuration, and according to the first aspect of the present invention, the following effects can be obtained. The piston rod 14 of the hydraulic cylinder 11 provided on one of the foundation A and the building B can be fitted into the locking hole 3 of the receiving member 2 provided on the other, and into the liquid cylinder 11. Since the wind pressure received by the building B is introduced through the pressure guiding tube 21, the wind sway in the direction perpendicular to the piston rod 14 can be reliably prevented with a simple configuration.
The piston rod 14 is formed so as to return to the original position when the wind pressure becomes equal to or lower than a predetermined value and the fitting into the locking hole 3 is released. In this state, the seismic isolation device C can be freely moved. Since it can be swung, the seismic isolation performance of the seismic isolation device for small and medium-sized earthquakes is not impaired.
○ Since no electric circuit is used, there is little malfunction and maintenance is easy.
[0037]
According to the invention of claim 2, since the throttle valve 24 is provided in the middle of the pressure guiding tube 21, the wind pressure introduced into the hydraulic cylinder 11 from the side of the building is averaged over time, and it is possible to cope with small changes in wind force. Therefore, it is possible to prevent the piston rod from slightly moving and causing a failure or the like.
[0038]
According to the third aspect of the present invention, the following effects are obtained. The positive and negative pressures at the leeward and leeward observation points are respectively introduced into the hydraulic cylinder chambers 12 and 12 on both sides of the piston by using the hydraulic cylinder 11 as a backward-acting cylinder. Since the change is introduced, the piston 13 slides due to the resultant force that matches the absolute value of the change amount. The device can be reliably operated accordingly.
O The fluctuation component of the wind pressure acting on the building is removed, and the wind sway prevention device can be operated when the building receives a strong wind of a predetermined pressure or more by using only the average component.
[0039]
According to the invention of claim 4, the locking holes 3 and the hydraulic cylinders 11 are provided at a plurality of locations on the lower surface of the building B, which are symmetrical with respect to the center of gravity G of the building, front and rear, and the hydraulic cylinders. Since the pressure guiding tube 21 is provided so as to introduce the wind pressure received by the building B from the same direction, the building can be prevented from twisting with respect to the foundation.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an apparatus according to a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the apparatus in FIG. 1 in a use state.
FIG. 3 is a view of the apparatus in FIG. 1 as viewed from the direction of line III-III.
FIG. 4 is a view of a first modification of the first embodiment as viewed from the direction of line III-III shown in FIG. 1;
FIG. 5 is a view of a second modification of the first embodiment as viewed from the same direction as in FIG. 3;
FIG. 6 is a semi-longitudinal sectional view of a third modification of the first embodiment, viewed from the same direction as FIG.
FIG. 7 is a longitudinal sectional view of a device according to a second embodiment of the present invention.
FIG. 8 is a longitudinal sectional view of a device according to a third embodiment of the present invention.
9 is a view of the device of FIG. 8 as viewed from the direction of line IX-IX.
FIG. 10 is an explanatory diagram of an operation of the device of FIG. 9 during an earthquake.
[Explanation of symbols]
A: foundation B: building B ₁ ... bottom wall B ₂ ... left and right side walls B ₃ , B ₄ ... front and rear walls C ... seismic isolation device 1 ... wind sway prevention device 2 ... receiving member 3 ... locking hole 5 ... fitting Groove 11 ... Hydraulic cylinder 12 ... Hydraulic cylinder chamber 13 ... Piston 14 ... Piston rod 15 ... Spring 16 ... Protection plate 17 ... Spacer 18 ... Support member 21 ... Pressure guide tube 22 ... Pressure receiving hole 24 ... Throttle valve 31 ... Guide device 32 ... Horizontal board 33 ... Guide rail 35 ... Stopper 36 ... Spring

Claims (4)

The locking hole 3 is fixed to one of the upper surface side of the foundation A and the lower surface side of the building B constructed on the foundation, and the hydraulic cylinder 11 that projects the piston rod 14 outward is fixed to the other. The hydraulic pressure in the hydraulic cylinder chamber 12 is made to correspond to the wind pressure received on one side of the building via the pressure guiding pipe 21. When the internal pressure increases by a certain limit or more, the piston rod 14 is connected to the locking hole. 3. A wind sway prevention device for a building, wherein the device is fitted into the device 3 and can be automatically removed by reducing the internal pressure. The building wind sway prevention device according to claim 1, wherein a throttle valve (24) is provided on the pressure guiding tube (21). The hydraulic cylinder 11 is a backward-acting cylinder in which the piston rods 14 and 14 protrude outward from both surfaces of the piston 13, respectively. The hydraulic pressure in the hydraulic cylinder chambers 12 and 12 on both sides of the piston is adjusted to the windward side of the building. Each wind pressure at the two measurement points on the leeward side is made to correspond to each wind pressure through the pressure guiding tubes 21 and 21, respectively.
3. The method according to claim 1, wherein one of the two piston rods is formed so as to be able to fit into one of the locking holes when the pressure difference between the two measurement points is equal to or greater than a certain limit. Building wind sway prevention device. The locking holes 3 and the hydraulic cylinders 11 are provided at a plurality of locations on the lower surface of the building B which are symmetrical with respect to the center of gravity G of the building in the front-rear or left-right directions, respectively. The building wind sway prevention device according to claim 1, 2 or 3, wherein the pressure guiding tube 21 is provided so as to introduce wind pressure received by B from the same direction.

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