JP2006233703A - Locking device for base-isolated building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a locking device for a base-isolated building capable of automatic resetting to have a locked state after an earthquake, though the locking device is a mechanical one in which a locked state is kept when no earthquake occurs and the locked state is switched to an unlocked state when the earthquake occurs. <P>SOLUTION: A dowel pin 9 vertically movable and urged downward is mounted on either one of a superstructure 1A or a substructure 1B of a base-isolating layer 2, and an engaging part 6 for fitting the dowel pin in it is mounted on the other in a manner that the dowel pin is freely inserted or removed. A water tank 10 housing a float 11 is provided near the dowel pin. The float and the dowel pin are linked to each other in a manner that the dowel pin is fitted into the engaging part by an upward movement of the float to have a locked state, and that the dowel pin moves out of the engaging part by a downward movement of the float to have an unlocked state. The tank and a low tank 12 are connected and communicated with each other by a water pipe. A water discharging lever 13 of the low tank is operated based on a result of earthquake sensing by an earthquake sensor 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention can be switched between a locked state that restrains horizontal movement in a seismic isolation layer in a base-isolated building and an unlocked state that allows horizontal movement, and is maintained in a locked state during a non-earthquake, and is unlocked during an earthquake. The present invention relates to a lock device for a seismically isolated building.

  In a base-isolated building where a base isolation layer is provided between the ground and the building or on the middle floor of the building so that the seismic force input to the building above the base isolation layer is attenuated, Relative horizontal movement in the seismic isolation layer can reduce the shaking of the building, but due to the presence of the seismic isolation layer, the building above the seismic isolation layer may be shaken more than a normal building in strong winds, reducing the comfortability. is there. In order to prevent this, the conventional method of restraining the horizontal movement in the seismic isolation layer with a damper device such as a lead damper is used up to the shear force level of the seismic isolation layer that occurs in rare cases such as large typhoons. It has been. However, with this method, the seismic isolation effect cannot be exhibited for small earthquakes up to the shear force level.

  As countermeasures against such problems, a seismic isolation device is provided between the ground and the ground structure, and a lock device capable of locking and unlocking the dynamic connection of the ground structure to the ground is provided. An anemometer that measures the wind speed acting on the structure is installed, and when the measured value of the anemometer exceeds the set value, the dynamic coupling is locked to prevent rocking of the ground structure due to the wind. On the other hand, an earthquake sensor is provided on the ground side, and even if the measured value by the anemometer exceeds the set value, the earthquake sensor signal is given priority and the lock is released when an earthquake occurs. Patent Document 1 proposes a seismic isolation building locking device configured as described above.

  According to the above conventional example, the building can be prevented from swinging due to strong winds, and even if an earthquake occurs during strong winds, the seismic sensor detects this and releases the lock. Further, breakage of the lock device is prevented. However, in the case of this conventional example, in addition to the power source for operating the lock device, many electric parts such as an anemometer, an earthquake sensor, and their control circuit are required, and the number of electrical failure occurrence points increases accordingly. Therefore, despite the fact that the seismic isolation device is once a few decades or is a facility for abnormal situations that may not occur, frequent maintenance inspections are required to ensure reliability. become.

  Even if regular maintenance inspections are carried out, it is impossible to deny the possibility of electrical failures occurring in the earthquake sensors and their control circuits in the event of an earthquake that is prone to unexpected situations such as power outages and leakages. Therefore, it can be said that it is desirable to have a mechanical configuration that does not rely on electrical components from the earthquake sensor to the locking device in order to reliably release the locking device in the event of an earthquake where it is not known what will happen.

  Patent Documents 2 and 3 describe a mechanical seismic isolation building lock device that is maintained in a locked state during a non-earthquake and switches to a unlocked state during an earthquake. That is, in Patent Document 2, a cylindrical locking protrusion hanging from the building side and a cylindrical locking protrusion rising from the ground side are fitted with a cylindrical lock member so as to straddle them, The lock member is held at a predetermined height from the ground by a support member made of a magnet or the like, and when a certain level of vertical vibration is applied due to an earthquake, the support by the support member is released by the inertial force acting on the lock member, and the lock member A locking device (trigger mechanism) is disclosed in which the vehicle falls on the ground due to its own weight and is unlocked.

  Patent Document 3 discloses a mechanical trigger mechanism for a seismic isolation device by providing a lever for maintaining a friction fixing mechanism provided between a base and a foundation in a locked state. Patent Document 3 discloses a mechanical lock device that maintains a locked state during a non-earthquake, and that the lever swings and unlocks when a weight falls on the lever at a constant seismic intensity during an earthquake. Yes.

  In these conventional examples, all have a mechanical structure, so there is less worry about failure and the reliability as a locking device is high. However, after an earthquake, an operator enters the seismic isolation layer and manually restores it. It is necessary to reset to the locked state.

JP-A-9-291721 Japanese Patent Laid-Open No. 10-38021 JP 2000-8644 A

  The present invention has been made in consideration of the above points, and its object is a mechanical locking device that is maintained in a locked state during a non-earthquake and switches to an unlocked state during an earthquake. Nevertheless, an object of the present invention is to provide a lock device for a seismic isolation building that can be automatically reset to a locked state after an earthquake.

  In order to solve the above problems, the technical means taken by the present invention are as follows. That is, the invention according to claim 1 can be switched between a locked state that restricts horizontal movement in a seismic isolation layer in a base-isolated building and an unlocked state that allows horizontal movement, and is maintained in a locked state during a non-earthquake. A locking device that switches to an unlocked state in the event of an earthquake. One of the upper structure and the lower structure of the seismic isolation layer is provided with a dowel pin that can be moved up and down and urged downward, and the dowel pin is inserted into and removed from the other structure. A locking part is provided to be freely inserted, a water tank in which a float is accommodated is provided in the vicinity of the dowel pin, and the float and the dowel pin are brought into a locked state in which the dowel pin is fitted into the locking part by raising the float. The dowel pin is linked so that the dowel pin comes out of the locking part and the unlocked state is established, and the water tank and low tank are connected by water pipes. It is characterized by being configured to operate the drain lever for low tank based on the seismic sensor results.

  The invention according to claim 2 is the locking device for the seismic isolation building according to claim 1, wherein an upper plate having a locking portion formed in the upper structure of the seismic isolation layer is provided, and the lower structure has A shear tube is provided opposite to the locking portion, and the dowel pin that can be moved up and down and is biased downward is inserted into the locking portion, and the unlocked state in which the upper end portion is fitted into the locking portion and the unlocked state that comes out of the locking portion. The lower part of the Saya tube is configured in a water tank, and the water tank contains a float that raises and lowers the dowel pin in a locked state and an unlocked state depending on the water level, and the water tank and the low tank are connected by a water pipe. The low tank drain lever is operated based on the earthquake detection result by the earthquake sensor.

  The seismic sensor may be an electric seismic sensor using a piezoelectric element type accelerometer, a capacitance type accelerometer, a semiconductor type accelerometer, or the like. In order to increase it, it is desirable that the seismic sensor also has a mechanical configuration.

Therefore, in the invention described in claim 3, in the seismic isolation building locking device according to claim 1 or 2, the seismic sensor is connected to the upper structure or the lower structure of the seismic isolation layer via a suspension spring. While the swing weight is suspended and supported, the lower structure of the seismic isolation layer supports one end of a horizontally disposed leaf spring, and the other end of the leaf spring is bent upward with respect to the leaf spring. An operation member having a plate portion is provided continuously, the swing weight is connected to the upper end portion of the rising plate portion of the operation member, and the operation member and the drain lever of the low tank are interlocked to each other. The drain lever is operated by the behavior of the operation member accompanying the shaking.

  According to the first and second aspects of the invention, it is possible to automatically reset to a locked state after an earthquake even though it is a mechanical locking device composed of a dowel pin, a float, a low tank, or the like. it can.

  That is, at the time of a non-earthquake, since the water level of the water tank is high and the float is rising, the dowel pin is maintained in the locked state engaged with the engaging portion, and unpleasant shaking of the seismic isolation building due to wind is prevented.

  In the event of an earthquake, the low tank drain lever is operated based on the earthquake detection result by the earthquake sensor to drain the water in the low tank, so that the water level in the water tank communicating with the low tank is lowered and the float is lowered. Since the dowel pin is released from the locking portion due to the lowering of the float and switches to the unlocked state that allows horizontal movement in the seismic isolation layer, the seismic isolation effect is exhibited.

  After the earthquake is finished, the low tank drain lever returns to the neutral position, and water is automatically supplied into the low tank via the ball tap, returning to the original water level, so the water level in the tank connected to the low tank also rises, The float rises, and the dowel pin is restored to the locked state engaged with the engaging portion by the rise of the float.

  In particular, according to the second aspect of the present invention, the lower part of the Saya tube is configured in the water tank, so that another water tank is provided in the vicinity of the Saya pipe, and the float in the water tank and the dowel pin in the Saya pipe are connected to the wire. As compared with the case of linking through a mechanical operating force transmission mechanism such as a link or a link, the lock device can be made simple and compact.

  According to the third aspect of the present invention, at the time of an earthquake, the swing weight supported by the leaf spring and the suspension spring starts to shake greatly in the up and down direction due to the arrival of the P wave. Depending on the behavior, the low tank drain lever is operated to drain the low tank water. Accordingly, the mechanical configuration from the seismic sensor to the locking device does not depend on the electrical components, and electrical failure can be eliminated and reliability can be improved.

  In addition, in order to efficiently swing the swing weight with a weak P wave, it is desirable to set the spring constant so that the swing weight resonates with the shaking of the ground. It is difficult to set the spring constant so that the swing weight cycle matches the primary cycle (natural frequency) of the ground with the leaf spring alone because strength is required to operate the drain lever with the operating member. is there. In this regard, according to the third aspect of the present invention, the swing weight is suspended and supported by the upper structure or the lower structure of the seismic isolation layer via the suspension spring. As a result, the spring constant as a whole can be easily set to a value (a spring constant at which the swing weight resonates with the vibration of the ground) such that the swing weight period matches the primary period (natural frequency) of the ground.

Hereinafter, an embodiment of the present invention will be described based on the drawings illustrating a so-called basic seismic isolation building in which a seismic isolation layer is disposed between the foundation and the lower end of the building. In FIG. 1, 1 is a base isolation building and 2 is a base isolation layer. The seismic isolation layer 2 can be switched between a seismic isolation device 3 made of, for example, laminated rubber, a locked state that restrains horizontal movement in the seismic isolation layer 2, and an unlocked state that allows horizontal movement, and A lock device 4 is installed that is maintained in a locked state during a non-earthquake.

  2 and 3 show details of the earthquake sensor 5 that switches the lock device 4 and the lock device 4 from the locked state to the unlocked state during an earthquake. A specific configuration of the locking device 4 will be described as follows. That is, as shown in FIGS. 2 and 3, the upper structure (building) 1A of the seismic isolation layer 2 is provided with a steel upper plate 7 in which a locking portion 6 formed of a recess is formed, and the lower structure ( The foundation) 1B is provided with a sheath tube 8 facing the locking portion 6. Between the upper plate 7 and the sheath tube 8, the upper and lower end portions are engaged with the engaging portion 6 and the sheath tube 8 (see FIG. 2), and the upper end portion is disengaged from the engaging portion 6 and the lower end. A dowel pin 9 is provided that is movable up and down and unlocked by its own weight over an unlocked state (see FIG. 3) in which the portion is fitted to the sheath tube 8.

  A lower part of the sheath pipe 8 is formed in a water tank 10. The water tank 10 accommodates a float 11 that is narrower than the dowel pin 9 and is connected to the bottom surface of the dowel pin 9. The float 11 moves up and down due to fluctuations in the water level of the water tank 10, and the dowel pin 9 is locked and unlocked. It is comprised so that it may raise / lower. A low tank 12 is connected to the water tank 10 through a water pipe 13. The low tank 12 is the same mechanism as the low tank installed in the flush toilet, and is configured by a ball tap, an overflow pipe, a float valve, a drain lever 14 connected to the float valve by a chain, etc., when automatic water supply is performed. The drain lever 14 is configured to be operated based on the earthquake detection result by the earthquake sensor 5.

  The dowel pin 9 is a high rigidity and high yield strength formed by a square steel pipe or the like, and is divided into upper and lower parts at an axially intermediate portion, and flanges provided at the butt ends of the upper and lower divided parts 9a and 9b. Are connected together by a plurality of relief bolts 15. The sheath pipe 8 is constituted by a square steel pipe into which a dowel pin 9 fits up and down, and is made of a steel annular plate 16 and a base plate 17 welded to both upper and lower ends and a concrete made between them. The base plate 18 is reinforced with the base block 17 and the base plate 17 is fixed to the lower structure 1B with anchor bolts.

  A specific configuration of the earthquake sensor 5 will be described as follows. That is, as shown in FIGS. 2 and 3, the upper structure 1A of the seismic isolation layer 2 is suspended and supported by a swing weight 20 via a suspension spring 19 composed of a coil spring that expands and contracts vertically. The fixing member 21 provided in the lower structure 1 </ b> B of the seismic layer 2 supports one end portion of the leaf spring 22 arranged horizontally, and the other end portion of the leaf spring 22 is bent upward with respect to the leaf spring 22. An operating member 24 having a rising plate portion 23 is connected, the swing weight 20 is connected to the upper end portion of the rising plate portion 23 of the operating member 24, and the operating member 24 and the drain lever 13 of the low tank 12 are connected by a wire 25. It is.

  Then, the drain lever 13 is operated by the behavior of the operation member 24 accompanying the up and down swing of the swing weight 20 due to the P wave at the time of the earthquake. Reference numeral 26 denotes a cushioning material installed at a position below the leaf spring of the lower structure 1B, and serves to prevent damage to the leaf spring 22 due to excessive deformation. Although not shown, the swing weight 20 may be suspended and supported by the lower structure 1 </ b> B via the suspension spring 19.

  According to the above configuration, since the lock device 4 of the base isolation building 1 is maintained in the locked state (see FIG. 2) during a non-earthquake, the horizontal movement in the base isolation layer 2 is restricted and the building is uncomfortable due to wind. Shaking is prevented.

In the event of an earthquake, the swing weight 20 supported by the leaf spring 22 and the suspension spring 19 begins to swing greatly up and down due to the arrival of the P wave. Due to the behavior of the operation member 24 at the end of the leaf spring 22 due to this swing, the low tank 12 Since the drain lever 13 is operated to drain the water in the row tank 12, the water level in the water tank 10 communicating with the row tank 12 is lowered, and the float 11 is lowered. As the float 11 descends, the dowel pin 9 is disengaged from the locking portion 6 and is switched to an unlocked state that allows horizontal movement in the seismic isolation layer 2, thereby exhibiting a seismic isolation effect.

  In order to efficiently swing the swing weight 20 with a weak P wave, it is desirable to set the spring constant so that the swing weight 20 resonates with the swing on the ground side (lower structure 1B). Since the spring 22 needs to be strong enough to support the swing weight 20 and to operate the drain lever 13 by the operation member 24, the swing weight 20 has a primary period (natural frequency) with the leaf spring 22 alone. It is difficult to set the spring constant so as to agree with. In this respect, according to the above-described configuration, the swing weight 20 is suspended and supported by the upper structure 1A or the lower structure 1B of the seismic isolation layer 2 via the suspension spring 19. This makes it easy to set the spring constant as a whole to a value (the spring constant at which the swing weight 20 resonates with the ground vibration) so that the period of the swing weight 20 matches the primary period (natural frequency) of the ground. Can be set.

  After the earthquake is finished, the drain lever 13 of the low tank 12 returns to the neutral position, and water is automatically supplied into the low tank 12 via the ball tap and returned to the original water level. Therefore, the water level in the water tank 10 communicating with the low tank 12 is restored. The float 11 is also raised, and the dowel pin 9 is automatically restored to the locked state in which the dowel pin 9 is engaged with the engaging portion 6 by the rise of the float 11.

  In the unlikely event that an unexpected wind load is applied to the building, or if the switch to the unlocked state is not performed during an earthquake due to some reason, the relief bolt 14 is applied by applying a shear force greater than the setting to the dowel pin 9. Is broken and the dowel pin 9 is vertically divided, so that the entire locking device is not damaged and the seismic isolation effect can be exhibited.

  Forming the lower part of the sheath tube 8 in the water tank 10 to accommodate the float 11 is very preferable in that the locking device 4 can be made simple and compact, but the present invention is shown in FIG. As described above, another water tank 10 is provided in the vicinity of the sheath pipe 8, and the float 11 in the water tank 10 and the dowel pin 9 in the sheath pipe 8 are raised so that the dowel pin 9 rises and the engagement is increased. Transmission of mechanical operating force such as a wire or a link so that the dowel pin 9 is lowered when the float 11 is lowered and the dowel pin 9 is released from the locking portion 6 when the float 11 is lowered. It can also be carried out in cooperation with the mechanism 26.

  In addition, as shown in FIG. 5, a locking portion 6 is provided on the lower structure 1B side of the seismic isolation layer 2, a sheath tube 8 is provided on the upper structure 1A side, and a dowel pin 9 that can freely move up and down is provided between them. The water tank 10 communicated with the low tank 12 is provided in the vicinity of the sheath pipe 8, and the float 11 and the dowel pin 9 accommodated in the water tank 10 are provided. The dowel pin 9 is lowered when the float 11 rises and the dowel pin 9 is pulled up against its own weight by lowering the float 11 via a mechanical operating force transmission mechanism 26 such as a wire or a link. Then, they may be linked so as to be in the unlocked state released from the locking portion 6.

  In the illustrated embodiment, the present invention has been described by taking an example of a so-called basic seismic isolation building in which a seismic isolation layer is disposed between the foundation and the lower end of the building, but the so-called seismic isolation layer is disposed on an intermediate floor. It goes without saying that the present invention can be implemented in various modes within a range that does not depart from the gist of the present invention, such as application of the present invention to a base-isolated base isolation building.

1 is an overall schematic side view showing a seismic isolation building locking device according to the present invention. It is a partially cutaway side view of the principal part in a locked state. It is a partially cutaway side view of the principal part in a lock release state. It is a schematic block diagram of the locking device which shows other embodiment. It is a schematic block diagram of the locking device which shows other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seismic isolation building 1A Superstructure 1B Lower structure 2 Seismic isolation layer 3 Seismic isolation device 4 Locking device 5 Seismic sensor 6 Locking part 8 Saya tube 9 Dowel pin 10 Water tank 11 Float 12 Low tank 13 Drain lever

Claims (3)

  A lock device that can be switched between a locked state that restricts horizontal movement in a seismic isolation layer in a base-isolated building and an unlocked state that allows horizontal movement, that is maintained in a locked state during non-earthquake, and that switches to an unlocked state during an earthquake. In the upper structure and the lower structure of the seismic isolation layer, a dowel pin that can be moved up and down and urged downward is provided, and a locking portion that allows the dowel pin to be removably inserted is provided on the other. A water tank containing a float is provided in the vicinity of the float, and the float and the dowel pin are brought into a locked state in which the dowel pin is fitted into the engaging portion when the float is raised, and the dowel pin is removed from the engaging portion when the float is lowered. The water tank and the low tank are connected to each other by a water pipe, and the rotor is based on the seismic detection result by the seismic sensor. Locking device seismic isolation building, characterized by being configured to operate the flush lever of click.   An upper plate with a locking portion formed in the upper structure of the seismic isolation layer, a sheath tube opposite to the locking portion is provided in the lower structure, and the dowel pin that is movable up and down and biased downward Is provided in a state in which the upper end portion can be switched between a locked state in which the upper end portion is fitted into the engaging portion and an unlocked state in which the upper end portion is removed from the engaging portion, and the lower portion of the sheath pipe is configured in a water tank, and Float that moves up and down in the locked state and unlocked state is accommodated, the water tank and low tank are connected with water pipes, and the drain lever of the low tank is operated based on the earthquake detection result by the earthquake sensor The seismic isolation building locking device according to claim 1.   The seismic sensor suspends and supports the swing weight on the upper structure or lower structure of the seismic isolation layer via the suspension spring, while the lower structure of the seismic isolation layer has a horizontally disposed leaf spring. An operation member having a rising plate portion bent upward with respect to the leaf spring is connected to the other end portion of the leaf spring to support one end portion, and the swing weight is connected to the upper end portion of the rising plate portion of the operation member. The operation member and the drainage lever of the low tank are linked to each other, and the drainage lever is operated according to the behavior of the operation member accompanying the swing weight swing due to the P wave at the time of an earthquake. Item 3. A lock device for a base-isolated building according to item 1 or 2.

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