JP4706240B2 - Seismic device for gantry in building - Google Patents

Description

  The present invention relates to an earthquake-proof device for a pedestal that is installed in a building and used for mounting a rotating body.

  In a turbine building of a nuclear power plant, a turbine mount on which power generation equipment having a rotating body such as a generator or a steam turbine is mounted. The turbine mount is provided in the turbine building with a gap in the horizontal direction from the casing of the turbine building. Due to the gap, the vibration of the power generation equipment is not easily transmitted from the turbine mount to the turbine building. Furthermore, due to the gap, even if the turbine building and the turbine mount vibrate due to an earthquake, a mutual interference accident between the turbine building and the turbine mount can be avoided by the gap interval.

  As described above, the turbine mount installed in the turbine building generally has an independent structure separated from the turbine building in the horizontal direction in which power generation equipment is installed at the top.

  Also, in the case of a turbine base constructed integrally with the turbine building, a table board is supported on the turbine base from below via a vibration isolator (vibration isolator), and power generation equipment is mounted on the table board. Yes (see, for example, Patent Document 1).

  In addition, as a seismic support structure, a damper that extinguishes the vibration energy of the earthquake by the friction of the disc spring, or a damper that moves the piston with the vibration energy of the earthquake in the lead enclosed in the cylinder, There is one that is connected between the turbine building and the casing of the turbine building (see, for example, Patent Document 2).

JP 2001-73713 A JP 2003-214116 A

  In the case of supporting the table plate using a vibration isolator, the vertical excitation force can be buffered, but there is a concern that the table plate and the like may collide with adjacent structures due to large horizontal displacement. is there.

  In the case of a seismic support structure in which a damper is connected between the turbine mount and the turbine building, the damper is firmly connected to the turbine mount and the turbine building. It is easy to transmit the vibration of the turbine from the turbine base to the turbine building side, and it is difficult to obtain the benefit of blocking the vibration with a gap, and the vibration is always transmitted to the damper. Therefore, it is necessary to frequently perform maintenance and inspection of the damper .

  Accordingly, an object of the present invention is to avoid the influence of the rotating body on the gantry and the building when receiving an earthquake while preventing the vibration of the rotating body from being transmitted from the gantry of the rotating body to the building.

The basic structural requirements of the present invention include a turbine mount that is installed in the building via a horizontal gap with respect to a turbine building of a nuclear power plant, and on which power generation equipment is mounted, and between the mount and the building In addition, the airbag is folded in a recess formed in a side wall of the building facing the horizontal gap, and the airbag is fixed to the building. , Provided separately from the pedestal, and provided with means for projecting toward the pedestal so that the air bag fills the horizontal gap and contacts the pedestal when the building is vibrated. Features.

  According to the present invention, the structure is not always connected to the building and the frame is maintained in an independent state, so that the vibration of the frame is not transmitted to the building, and the shock absorber dissipates the vibration energy in the event of an earthquake. As a mechanism, the projecting between the building and the pedestal is projected through the gap between the building and the pedestal, and the seismic energy to be transmitted between the building and the pedestal is dissipated by the mechanism.

  The first embodiment of the present invention is as follows. That is, the turbine mount 2 is constructed inside the turbine building 1 of the nuclear power plant. The turbine mount 2 and the turbine building 1 have a gap 3 in the horizontal direction between them as shown in FIGS. 1 and 2, and are independent from each other. A power generation facility 12 of a nuclear power plant is mounted on the turbine mount 2. The power generation facility 12 includes rotating structures such as a generator 2a and steam turbines 12b, 12c, and 12d.

  As shown in FIG. 2, the four horizontal sides of the turbine mount 2 have gaps 3 with respect to the casing of the turbine building, but the gaps 3 at the six long sides and the two short sides are The mechanism that dissipates vibration energy is used as a space that expands and protrudes. FIG. 2 shows a state after the mechanism for dissipating vibration energy expands and protrudes into the gap toward the turbine mount 2.

  A shock absorber is adopted as a mechanism for dissipating vibration energy, and the shock absorber is stored in the storage area 4 shown in black in FIG. 1. It protrudes so as to contact 2. The shock absorber adopted as a mechanism for dissipating the vibration energy has the following configuration. That is, the airbag 5 is adopted as a bag that receives compressed gas and inflates. The airbag 5 is folded. A recess is formed as a storage region 4 in the side wall of the turbine building 1 facing the gap 3, and an airbag 5 folded in the recess is stored. Therefore, in a state where the airbag 5 is stored in the storage area 4, the airbag 5 does not protrude into the gap 3. Therefore, the gap 3 is secured as designed. A part of the airbag 5 is fixed to the turbine building 1 so as not to easily fall off.

  The following devices are connected to the air bag 5 as means for causing the air bag 5 to protrude toward the turbine mount 2 through the gap 3. That is, the inside of the cylinder 6 filled with the compressed gas is connected to the inside of the airbag 5 through the pipe 7, and an opening / closing valve 8 is provided in the middle of the pipe 7 so as to be between the cylinder 6 and the airbag 5. The flow path by the pipe 7 can be opened and closed. The on-off valve 8 is always closed, but is opened when an earthquake occurs. For this purpose, a control device 10 that controls opening and closing of the valve is connected to the valve drive device 9 of the on-off valve 8. The control device 10 is connected to receive a signal output from the earthquake sensing device 11. The control circuit of the control device 10 receives a signal transmitted from the earthquake sensing device 11 when the earthquake sensing device 11 senses an earthquake, and gives a command for driving the valve drive device 9 to open the on-off valve 8. Is assembled.

  The seismic sensing device 11, cylinder 6, pipe 7, on-off valve 8, control device 10, and seismic sensing device 11 are installed in the turbine building 1. It may be installed in the place. However, it is preferably installed in the turbine building 1 so that the collision of flying objects on the turbine building can be detected.

According to the quake-proof device of the gantry having such a configuration, the seismic sensing device 11 does not transmit a signal in a state where it is not subjected to an earthquake, so the on-off valve 8 is kept closed, and the compressed gas in the cylinder 6 is The air bag 5 is not pumped into the air bag 5, and the air bag 5 does not project to the turbine mount 2 side through the gap 3. Therefore, transmission of vibration transmitted from the power generation facility 12 to the turbine mount 2 to the turbine building 1 side and the airbag 5 is blocked by the gap 3. Therefore, the vibration is not transmitted to the turbine building 1 side, and there is no concern that various devices installed on the turbine building 1 side are damaged by the vibration. Naturally, the airbag 5 or the connection port between the airbag 5 and the pipe 7 is not damaged, and the necessity for maintenance and inspection is not frequently required.

  Next, when the nuclear power plant receives an earthquake from the outside that is comparable to the earthquake, such as a vibration caused by a collision of a flying object against the outdoor wall of the turbine building, the earthquake sensing device 11 Senses the vibration of the building and sends a signal. The transmitted signal from the earthquake sensing device 11 is transmitted and inputted to the control device 10, and the control device 10 receives the signal and gives a command to open the on-off valve 8 to the valve drive device 9. Upon receipt of the command, the valve driving device 9 opens the on-off valve 8 and opens the pipe 5 between the airbag 5 and the cylinder 6.

  When this happens, the compressed gas in the cylinder 6 is injected into the airbag 5, and the folded airbag 5 expands and protrudes from the storage area 4 into the gap 3 and expands. In this way, the control device 10 is responsible for the control function when the airbag 5 is projected into the gap 3. The inflated airbag 5 is interposed between the casing of the turbine building 1 and the turbine mount 2 without any gap. Even if the turbine base 2 and the turbine building 1 vibrate relatively in this state, the energy of the vibration is received by the airbag 5 to be buffered and dissipated, and the shock between the turbine base 2 and the turbine building 1 is impacted. Preventive interference accidents and the safety of the power generation equipment 12 mounted on the turbine mount 2 are ensured. In this way, damage caused by the earthquake on the turbine mount 2, the turbine building 1, and the power generation equipment 12 mounted on the turbine mount 2 is avoided.

  The second embodiment of the present invention is as follows. In the second embodiment, the configuration of the first embodiment is partially changed. The changes will be described below, and description of the same contents as in the first embodiment will be omitted. The modification of the second embodiment from the first embodiment is that, as shown in FIG. 3, the intermediate height portion of the turbine mount 2 is connected to the turbine building 1 side, and the upper part of the turbine mount 2 is a horizontal table plate 20. It is said. The table plate 20 is supported on the turbine mount 2 via a vibration isolation device 21 such as an antivibration rubber having a function of insulating vibration transmission and a viscous damper that absorbs vibration energy.

  A power generation facility 12 is mounted on the table plate 20. Further, the installation height of the airbag 5 is adjusted so that it can face the turbine mount 2 and the edge surface of the table plate 20 in the horizontal direction. Therefore, when an earthquake occurs, the vibration energy of the earthquake is dissipated by the vibration isolator 21, and the damage caused by the earthquake of the table board 20 and the power generation equipment 12 mounted on the table board 20 is alleviated. Further, the roll of the table plate 20 due to the earthquake is also buffered by the airbag 5 expanded and deployed in the gap 3 to reduce damage caused by the earthquake. Other configurations and operations are the same as those of the first embodiment.

  The third embodiment of the present invention is an embodiment in which an oil damper 30 is used as a shock absorber instead of the airbag 5. As shown in FIG. 4, the turbine mount 2 and the casing of the turbine building 1 are independent from each other through a horizontal gap 3. A steel plate receiving plate 31 is fixed to a side surface near the upper portion of the turbine mount 2. A recess 32 for accommodating the oil damper 30 is formed in the casing of the turbine building 1 facing the receiving plate 31. In the recess 32, an oil damper 30 is installed with the damping direction in the horizontal direction. The configuration of the oil damper 30 is as follows.

  That is, the bottom of the cylinder 33 filled with highly viscous oil is fixed to the vertical surface of the recess 32 via the base plate 34. The base plate 34 is fixed to the vertical surface of the recess 32 in advance. A piston 36 in which an orifice 35 is formed is provided in the cylinder 33, and a piston rod 37 connected to the piston 36 projects out of the cylinder 33. A pressing plate 38 made of a steel plate is fixed to the protruding end of the piston rod 37. A compressed coil spring 39 is provided around the piston rod 37 between the pressing plate 38 and the cylinder 33.

A steel support frame 40 is fixed to the base plate 34 in parallel with the cylinder 33 around the oil damper 30. A rod-like trigger claw 42 is provided at the end of the support frame 40 near the pressing plate 38 by a rotating shaft 41 so that the support frame 40 can rotate in the state shown in FIGS. An electromagnetic actuator 43 is fixed to the support frame 40. The electromagnetic actuator 43 has a configuration capable of protruding and retracting the movable rod 44 by electromagnetic force. In order to generate an electromagnetic force for operating the movable rod 44, the electromagnetic actuator 43 is connected to a power supply circuit 47 that supplies power from the power source 45 by opening / closing the open / close switch 46 or stops power supply. . The opening / closing switch 46 is controlled to open / close by a control device 48. The opening / closing switch 46 is normally closed, and the control device 48 has a condition circuit in which the opening / closing switch 46 is opened on condition that a signal transmitted from the earthquake sensing device 11 is received.

  While the electromagnetic actuator 43 is being supplied with power, the movable rod 44 protrudes and hits the trigger claw 42, and the trigger claw 42 maintains a state where it hits the pressing plate 38 from the side opposite to the coil spring 39 as shown in FIG. To do. On the contrary, when the power supply to the electromagnetic actuator 43 is cut off, the movable rod 44 is drawn and the trigger claw 42 is allowed to rotate from the state of FIG. 6 to the state of FIG.

The control device 48, the power feeding circuit 47, and the open / close switch 46 are also installed on the turbine building 1 side. The oil damper 30 that is controlled to project into the gap 3 by the control device 48, the electromagnetic actuator 43, and the trigger claw 42 is disposed at the position of the airbag 5 in the first embodiment shown in FIG. Are arranged in the recesses 32 of the turbine building 1 so as to be in the same position. Other configurations are the same as those of the first embodiment. The recess 32 is used as a storage area in which the oil damper 30 and the trigger claw 42 are stored so that they do not protrude into the gap.

  In this embodiment, normally, as shown in FIG. 6, the open / close switch 46 is closed and the power supply 45 supplies power to the electromagnetic actuator 43, so that the trigger claw 42 is caught on the pressing plate 38 and the coil spring 39 is The compressed state is maintained as shown in FIG. In this state, the gap 3 between the oil damper 30 and the receiving plate 31 is ensured as designed, so that mechanical vibrations generated by the power generation equipment 12 on the turbine mount 2 are subjected to mechanical vibration generated by the turbine building 1, the oil damper 30, and the accompanying vibrations. To the control device 48 or the like.

When an earthquake occurs and the earthquake sensing device 11 senses the earthquake, a signal is transmitted from the earthquake sensing device 11 to the control device 48. Upon receiving the transmitted signal, the control device 48 opens the open / close switch 46, so that the power supply from the power supply 45 to the electromagnetic actuator 43 is cut off, and the movable rod 44 of the electromagnetic actuator 43 is retracted away from the trigger claw 42. . Along with this, the pressing plate 38 repels the trigger pawl 42 with the help of the coil spring 39. Therefore, the trigger claw 42 rotates from the state shown in FIG. 6 to the state shown in FIG. When such trigger pawl 42 rotates, the pressing plate 38 of the oil damper 30 protrudes toward the receiving plate 31 into the gap 3 by the coil spring 39. Finally, as shown in FIG. Is received and the protrusion of the oil damper 30 stops.

  Thereafter, when relative vibration is generated between the turbine mount 2 and the turbine building 1, the piston 36 reciprocates in the horizontal direction in the cylinder 33 by the force of the earthquake or the coil spring 39 due to the relative displacement therebetween. When the piston 36 moves in the cylinder 33, the oil in the cylinder 33 passes through the orifice 35 while receiving a flow resistance. At that time, the seismic energy is absorbed and dissipated. When the turbine base 2 and the turbine building 1 are relatively displaced in the direction in which the gap 3 widens, the piston rod 37 is protruded from the cylinder 33 by the force of the coil spring 39 so as to follow the displacement as much as possible.

  In this manner, the energy of the earthquake is absorbed by the oil damper 30 while following the displacement of the gap 3 between the turbine mount 2 and the turbine building 1, and the turbine mount 2, the power generation equipment 12 installed on the mount, and the turbine Improve earthquake resistance with Building 1 to reduce damage from earthquakes.

  Thus, in any of the embodiments, an independent structure is maintained so that the vibration of the power generation equipment 12 is not transmitted from the turbine base 2 to the turbine building 1 during normal operation in the turbine base 2 where the power generation equipment 12 that is a rotating body is installed. However, it is possible to provide an earthquake resistant device that can reduce the load received by the turbine mount 2 during an earthquake.

  The quake-proof device according to the present invention can be employed as a means for buffering or dissipating vibration energy from the outside that tries to travel between the turbine building and the turbine gantry of a nuclear power plant, for example.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole schematic diagram of the quake-proofing apparatus of the mount frame by 1st Example of this invention. It is a top view of the mount frame which showed arrangement | positioning of the airbag in FIG. It is a whole schematic diagram of the quake-proof device of a gantry by the 2nd example of the present invention. It is a longitudinal cross-sectional view of the oil damper vicinity of the quake-resistant apparatus of the mount frame by 3rd Example of this invention. It is the longitudinal cross-sectional view which showed the protrusion state of the oil damper of FIG. It is an enlarged view of the trigger claw vicinity of FIG. FIG. 6 is an enlarged view of the vicinity of the trigger claw in FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Turbine building, 2 ... Turbine mount, 3 ... Gap, 4 ... Storage area, 5 ... Air bag, 6 ... Cylinder, 7 ... Piping, 8 ... On-off valve, 9 ... Valve drive device, 10 ... Control device, 11 ... Seismic sensing device, 12 ... power generation equipment, 20 ... table plate, 21 ... vibration isolator, 30 ... oil damper, 31 ... receiving plate, 32 ... depression, 33 ... cylinder, 34 ... base plate, 35 ... orifice, 36 ... piston, 37 ... Piston rod, 38 ... Pressing plate, 39 ... Coil spring, 40 ... Support frame, 41 ... Rotating shaft, 42 ... Trigger claw, 43 ... Electromagnetic actuator, 44 ... Moving rod, 45 ... Power source, 46 ... Open / close switch, 47 ... Power feeding circuit, 48... Control device.

Claims (4)

A turbine mount that is installed in the building via a horizontal gap with respect to the turbine building of the nuclear power plant and mounts power generation equipment ;
In the earthquake-proof device of the gantry provided with an airbag between the gantry and the building,
The airbag is folded into a recess formed in a side wall of the building facing the horizontal gap,
The airbag is fixed to the building and provided separately from the gantry ,
The building is such that the air bag when subjected to vibration in contact with the frame to fill the horizontal clearance, seismic device frame, characterized in that it comprises means for projecting toward the pedestal. According to claim 1, seismic device frame, characterized in that the seismic sensor unit is equipped with means to project the air bag on the basis of a signal transmitted upon sensing seismic. According to claim 2, wherein the airbag is pre SL provided on the building side, and the hollow member which bulges into the other rack stand in the gap to accept the pressure, the pressure to the interior of the hollow member And means for supplying
A quake-proof device for a gantry comprising a control means for controlling the air bag to protrude so that supply of the pressure to the hollow member is started when the signal is transmitted. . In Claim 3, The said mount is provided with the table board supported with the vibration isolator at the height which opposes the said hollow member in a horizontal direction, The said power generation equipment is supported by the said table board, It is characterized by the above-mentioned. Seismic device for gantry.

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