JP2012008102A - Refueling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refueling machine capable of improving aseismatic performance.SOLUTION: A refueling machine 1 according to the present invention comprises: a bridge rail 10 installed on a floor 3 around a reactor pool 2 which stores fuel rods for a nuclear reactor; a bridge 20 having a bridge wheel 21 which travels on the bridge rail 10, and a bridge leg part 22 which rotation-freely holds the bridge wheel 21; a trolley 32 which travels on the bridge 20 in a direction orthogonal to the bridge rail 10; and a gripper 33 which is provided on the trolley 32 and performs inserting or withdrawing operation of the fuel rods. A slide part 40 which is arranged on both sides of an axis extending along the longitudinal direction of the bridge rail 10 on which the bridge wheel 21 travels and has a lower surface 40a which is freely slidable on the bridge rail 10 is provided on a lower surface 22b of the bridge leg part 22. The lower surface 40a of the slide part 40 is inclined so as to descend toward the direction separating from the axis.

Description

  The present invention relates to a refueling machine for inserting or withdrawing fuel rods in a nuclear reactor facility.

  2. Description of the Related Art Conventionally, a fuel changer has a structure for preventing the fuel changer from falling down and the wheels of the fuel changer from falling off when an earthquake occurs. For example, the refueling machine has a structure that prevents the refueling machine from overturning and the wheels from falling off by bringing a part having a claw shape into contact with the rail when an earthquake occurs. (For example, refer to Patent Document 1 and Patent Document 2).

  There is also known a fuel exchanger having a guide plate provided along a bridge rail of the fuel exchanger and a buffer member provided on a bridge leg (see, for example, Patent Document 3). In such a refueling machine, when an earthquake occurs, the bridge leg is supported by the guide plate via the buffer member, and the shock when the bridge leg abuts against the guide plate is buffered. At the same time, the refueling machine is prevented from overturning and the wheels from being derailed.

JP-A-62-71894 Japanese Patent No. 3456900 JP 2009-8670 A

  By the way, in recent years, the guidelines for reviewing seismic design for nuclear power generation facilities have been revised. In addition, there is an increasing demand for further improvement of earthquake resistance in nuclear reactor facilities based on recent earthquake damages such as the Hyogoken-Nanbu Earthquake and the Chuetsu-oki Earthquake. Furthermore, not only newly installed fuel exchangers in the future, but also existing fuel exchangers that have already been installed, not only the revised seismic design examination guidelines, but also earthquake motion levels that greatly exceed conventional design seismic motion. Seismic performance is required.

  The present invention has been made in consideration of such points, and an object of the present invention is to provide a fuel exchanger capable of improving seismic performance.

  The present invention provides, as a first solution, a bridge rail installed on a floor around a reactor pool in which a fuel rod for a nuclear reactor is housed in a fuel exchanger that inserts or pulls out a fuel rod for a nuclear reactor. A bridge wheel that travels on the bridge rail, a bridge leg that rotatably holds the bridge wheel, and a trolley that travels on the bridge in a direction perpendicular to the bridge rail. A grip provided on the trolley for inserting or withdrawing fuel rods, and provided on the lower surface of the bridge leg and disposed on both sides of the longitudinal axis of the bridge rail passing through the bridge wheel. And a slide portion having a lower surface slidable on the bridge rail, wherein the lower surface of the slide portion is separated from the axis. To provide a refueling machine, characterized in that is inclined so as to descend toward the.

  In the first solving means described above, the lower surface of the slide portion may be arranged at a position higher than the lower end of the bridge wheel on the bridge wheel side.

  Further, in the first solving means described above, a rail roller attached to the bridge leg via a trigger member and rollable on a side surface of the bridge rail is further provided, and the trigger member is provided for the bridge. When a force of a predetermined value or more is applied in a substantially horizontal direction orthogonal to the longitudinal direction of the rail, the bridge leg may be removed.

  Further, in the first solving means described above, a floor side fixing portion provided on a side of the bridge leg portion and having an abutment surface that can abut on a side surface of the bridge leg portion may be further provided. .

  Further, in the first solving means described above, a guide member provided on a side of the bridge leg and extending along a longitudinal direction of the bridge rail, and interposed between the bridge leg and the guide member A force absorbing mechanism capable of absorbing force in a direction perpendicular to the longitudinal direction of the bridge rail, the force absorbing mechanism comprising: a leg side end attached to the bridge leg; and A guide side end that is slidable on the guide member, a force that is coupled between the leg side end and the guide side end, and that can absorb a force in a direction perpendicular to the longitudinal direction of the bridge rail. You may make it have an absorption part.

  Further, in the first solving means described above, the guide member has a horizontal guide surface formed substantially horizontally and a vertical guide surface formed substantially vertical, and the guide side end of the force absorbing mechanism. The portion may be slidable on the horizontal guide surface and the vertical guide surface of the guide member.

  Further, in the first solving means described above, the guide side end portion of the force absorbing mechanism may include a guide roller that can roll on the guide member.

  Further, in the first solving means described above, the guide member has a horizontal guide surface formed substantially horizontally, and a vertical guide surface connected to the horizontal guide surface and formed substantially vertically, The guide side end of the force absorbing mechanism may be rollable to the horizontal guide surface and the vertical guide surface of the guide member.

  Further, in the first solving means described above, the guide member has a vertical guide surface formed substantially vertically, and the rotation surface of the guide roller of the force absorbing mechanism is substantially horizontal. It may be arranged so that it can roll on the vertical guide surface of the guide member.

  In the first solving means described above, the guide side end portion of the force absorbing mechanism may be separated from the vertical guide surface of the guide member.

  In the first solving means described above, the guide member has a vertical plate extending substantially vertically, and the guide side end portions of the force absorbing mechanism are slidable on both surfaces of the vertical plate. You may make it have a sliding surface.

  In the first solving means described above, the force absorbing portion may include a coil spring, laminated rubber, disc spring, leaf spring, resin spring, magnetic spring, resin block, or metal block. .

  In the first solving means described above, the force absorbing portion may include a damper.

  The present invention provides, as a second solution, a bridge rail installed on a floor around a reactor pool in which a fuel rod for a nuclear reactor is housed in a fuel exchanger that inserts or pulls out a fuel rod for a nuclear reactor. A bridge wheel that travels on the bridge rail, a bridge leg that rotatably holds the bridge wheel, and a trolley that travels on the bridge in a direction perpendicular to the bridge rail. A grip provided on the trolley for inserting or withdrawing fuel rods, a guide member provided on a side of the bridge leg and extending along a longitudinal direction of the bridge rail, and the bridge leg And a force absorbing mechanism interposed between the guide member and capable of absorbing a force in a direction perpendicular to the longitudinal direction of the bridge rail, The collecting mechanism is connected between the leg side end attached to the bridge leg, the guide side end slidable on the guide member, and the leg side end and the guide side end. And a force-absorbing portion capable of absorbing a force in a direction perpendicular to the longitudinal direction of the bridge rail.

  In the second solving means described above, the bridge wheel may have a width wider than the width of the bridge rail.

  In the second solution described above, the guide member has a vertical plate extending substantially vertically, and the guide side end portion of the force absorbing mechanism is slidable on both surfaces of the vertical plate. You may make it have a sliding surface.

  Further, in the second solving means described above, the force absorbing portion may include a coil spring, a laminated rubber, a disc spring, a leaf spring, a resin spring, a magnetic spring, a resin block, or a metal block. .

  In the second solving means described above, the force absorbing portion may have a damper.

  According to the present invention, the seismic performance of the fuel exchanger can be improved.

FIG. 1A is a top view showing an overall configuration of a fuel changer according to a first embodiment of the present invention. FIG.1 (b) is a front view of Fig.1 (a). FIG. 2 is a cross-sectional view showing a configuration around a bridge leg portion of the fuel exchanger according to the first embodiment of the present invention. FIG. 3 is a side view showing the fuel changer according to the first embodiment of the present invention. FIG. 4 is a front view showing the fuel changer according to the first embodiment of the present invention. FIG. 5 is a diagram illustrating a state in which a displacement in a substantially horizontal direction occurs in FIG. 2. FIG. 6 is a cross-sectional view showing a configuration around a bridge leg portion of a fuel exchanger according to a second embodiment of the present invention. FIG. 7 is a side view showing a fuel changer according to a second embodiment of the present invention. FIG. 8 is a front view showing a fuel changer according to a second embodiment of the present invention. FIG. 9 is a cross-sectional view showing a configuration around a bridge leg portion of a fuel exchanger according to a third embodiment of the present invention. FIG. 10 is a cross-sectional view showing a configuration around a bridge leg portion of a fuel exchanger according to a fourth embodiment of the present invention. FIG. 11 is a cross-sectional view showing a configuration around a bridge leg portion of a fuel exchanger according to a fifth embodiment of the present invention. FIG. 12 is a cross-sectional view showing a configuration around a bridge leg portion of a fuel exchanger according to a sixth embodiment of the present invention. FIG. 13: is sectional drawing which shows the structure of the bridge leg part periphery of the fuel exchanger in the 7th Embodiment of this invention. FIG. 14 is a cross-sectional view showing a configuration around a bridge leg portion of a fuel exchanger according to an eighth embodiment of the present invention. FIG. 15 is a side view showing a fuel changer according to an eighth embodiment of the present invention.

  Hereinafter, a fuel changer according to an embodiment of the present invention will be described with reference to the drawings. Here, the refueling machine is for inserting or withdrawing fuel for the nuclear reactor.

First Embodiment First, a fuel exchanger according to a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1A, 1B, and 2, the refueling machine 1 includes a bridge rail 10 installed on a floor 3 around a nuclear reactor pool 2 in which nuclear fuel is stored. And a bridge 20 capable of traveling on the bridge rail 10. Among these, the bridge 20 includes a bridge wheel 21 that travels on the bridge rail 10 and a pair of bridge legs 22 that rotatably hold the bridge wheel 21. As shown in FIG. 3, the bridge leg portion 22 extends in the longitudinal direction of the bridge rail 10 (the traveling direction of the bridge 20), and two bridge wheels 21 are held by each bridge leg portion 22. Moreover, the bridge leg part 22 has a rectangular cross section, as shown in FIG.

  As shown in FIG. 1, a trolley rail 30 that extends in a direction orthogonal to the bridge rail 10 is provided on the upper surface of the bridge 20, and the trolley wheels that run on the trolley rail 30 are on the trolley rail 30. A trolley 32 having 31 (see FIG. 3) is provided. In addition, the trolley 32 is provided with a gripper 33 for performing insertion or withdrawal operation of a fuel rod (not shown).

  Such a fuel exchanger 1 is installed so as to straddle the upper part of the reactor pool 2 in order to insert or pull out an arbitrary fuel rod stored in the reactor pool 2.

  As shown in FIG. 2, a T-section steel 11 is embedded in the floor 3 on which the refueling machine 1 is installed. Not fixed). The bridge rail 10 is fixed to the T-shaped steel 11 with a clip bolt 14 via a rail clip 13. In this way, the bridge rail 10 is firmly fixed to the floor 3.

  On the lower surface 22 b of the bridge leg 22, the lower surface 40 a is slidable on the bridge rail 10 on both sides of an axis along the longitudinal direction of the bridge rail 10 passing through the bridge wheel 21 (an axis passing through the two bridge wheels 21). There is provided a slide plate (slide part) 40 having. In the present embodiment, as shown in FIG. 3, the slide plate 40 is located on both sides of the bridge wheel 21 (that is, the position corresponding to the bridge wheel 21 in the longitudinal direction of the bridge rail 10). However, the present invention is not limited to this, and the slide plate 40 may be arranged at a position shifted in the longitudinal direction of the bridge rail 10 with respect to the bridge wheel 21.

  The lower surface 40a of the slide plate 40 is inclined so as to descend in a direction away from the above-described axis. Further, the lower surface 40a of the slide plate 40 is disposed at a position higher than the lower end of the bridge wheel 21 on the bridge wheel 21 side (proximal side) and at the opposite side (distal side) of the bridge wheel 21. ) In the position lower than the lower end of the bridge wheel 21.

  As shown in FIG. 3, rail rollers 50 that can roll on the side surface 10a of the bridge rail 10 are attached to both ends of the bridge leg portion 22 (the front end portion and the rear end portion in the traveling direction of the bridge 20). Yes. When the rail roller 50 rolls on the side surface 10a of the bridge rail 10, the bridge wheel 21 is restrained from moving in a direction perpendicular to the longitudinal direction of the bridge rail 10, and the bridge wheel 21 is moved to the bridge rail. 10 is guided and travels. In addition, each rail roller 50 is held at both ends of the bridge leg portion 22 via a support 51. The support 51 is attached to both ends of the bridge leg 22 via the trigger pin 52. The trigger pin 52 is configured to hold the rail roller 50 and the support 51 at both ends of the bridge leg 22 during normal operation. The trigger pin 52 is predetermined in a substantially horizontal direction orthogonal to the longitudinal direction of the bridge rail 10. When a force greater than the value (for example, seismic force) is applied, the bridge leg 22 is removed.

  As shown in FIGS. 2 and 4, on the side (outside) of the bridge leg portion 22, a floor-side fixing portion 60 having a contact surface 60 a that can freely contact the side surface 22 a of the bridge leg portion 22 is provided. Yes. The floor-side fixing part 60 extends along the longitudinal direction of the bridge rail 10 and is fixed to the floor 3 using anchor bolts 61.

  Next, the operation of the present embodiment having such a configuration will be described.

  First, normal operation of the fuel changer 1 will be described.

  During normal operation, as shown in FIGS. 1 (a) and 1 (b), on the bridge rail 10, the bridge wheel 21 is driven to rotate to travel the bridge 20, and after the bridge 20 reaches a desired position, The bridge 20 is stopped. During this time, the trigger pin 52 is not detached from the bridge leg 22, and the rail roller 50 is held by the bridge leg 22. Further, since the lower surface 40 a of the slide plate 40 is disposed at a position higher than the lower end of the bridge wheel 21 on the bridge wheel 21 side, the slide plate 40 does not contact the bridge rail 10. Thus, the bridge wheel 21 is guided by the rail roller 50, and the bridge 20 can smoothly travel on the bridge rail 10.

  Further, the trolley wheel 31 is driven to rotate on the trolley rail 30 to run the trolley 32. After the trolley 32 reaches a desired position, the trolley 32 is stopped.

  In this way, the gripping tool 33 provided on the trolley 32 can be disposed above the desired fuel rod among the fuel rods stored in the reactor pool 2. Thereafter, the fuel rod can be inserted or pulled out using the gripper 33.

  Next, a case where an earthquake occurs in such a fuel exchanger 1 and a substantially horizontal seismic force perpendicular to the longitudinal direction of the bridge rail 10 is loaded on the fuel exchanger 1 will be described.

  In this case, first, when the seismic force in this direction is equal to or greater than a predetermined value, the trigger pin 52 holding the rail roller 50 is detached from both ends of the bridge leg 22. As a result, the bridge wheel 21 is released from the restraining force by the rail roller 50.

  When the trigger pin 52 is disengaged, the bridge leg 22 is relatively displaced with respect to the bridge rail 10 in a substantially horizontal direction (here, as an example, leftward in FIGS. 2, 4, and 5). In this case, one (left side in FIG. 4) of the pair of bridge legs 22 moves away from the reactor pool 2 and the other (right side in FIG. 4) bridge leg 22 is Move to the reactor pool 2 side. As a result, the bridge wheel 21 held by the bridge leg 22 slides on the bridge rail 10.

  When the bridge leg portion 22 is relatively displaced by a predetermined distance, as shown in FIG. 5, the bridge wheel 21 held by the one bridge leg portion 22 comes off from the bridge rail 10 and moves on the bridge rail 10. The lower surface 40a of the slide plate 40 provided on the inner side (reactor pool 2 side) of the lower surface 22b of the bridge leg 22 slides and slides. During this time, the lower surface 40a of the slide plate 40 slides on the bridge rail 10 and slides on the other bridge leg 22 in the same manner. In this case, the load of the bridge 20 is supported by the slide plate 40.

  When the seismic force applied is large, the bridge leg portion 22 is further relatively displaced, and the side surface 22a of the bridge leg portion 22 abuts against the abutment surface 60a of the floor-side fixing portion 60. Thereby, it is possible to prevent the bridge wheel 21 from being detached from the lower surface 40a of the slide plate 40.

  By the way, when the seismic force is applied to the refueling machine 1 in the longitudinal direction of the bridge rail 10, the bridge wheel 21 can freely slide on the bridge rail 10 in the longitudinal direction. As a result, the seismic force applied to the fuel exchanger 1 can also be reduced in the longitudinal direction of the bridge rail 10.

  Thus, according to the present embodiment, when an earthquake occurs and an earthquake force is applied in a substantially horizontal direction orthogonal to the longitudinal direction of the bridge rail 10, the bridge leg 22 and the bridge rail 10 are In the meantime, a relative displacement in a substantially horizontal direction occurs, and the bridge wheel 21 slides on the bridge rail 10. Here, when the bridge wheel 21 is detached from the bridge rail 10, the lower surface 40 a of the slide plate 40 provided on the lower surface 22 b of the bridge leg portion 22 slides on the bridge rail 10 and slides sideways. Thereby, the seismic force applied to the bridge 20 and the trolley 32 can be reduced, and the seismic performance can be improved. Further, since the lower surface 40a of the slide plate 40 slides on the bridge rail 10, it is possible to suppress the impact on the bridge 20 and the trolley 32 when the bridge wheel 21 is detached from the bridge rail 10. it can.

  Further, according to the present embodiment, the slide plate 40 is attached to the lower surface 22b of the bridge leg portion 22 and the floor side fixing portion 60 is provided on the side of the bridge leg portion 22 to thereby improve the seismic performance of the fuel exchanger 1. It is improving. Such a slide plate 40 and the floor side fixing | fixed part 60 can be easily installed in the existing fuel exchanger 1 at low cost. For this reason, not only the new fuel exchanger 1 but also the existing fuel exchanger 1 can easily improve the seismic performance at low cost.

  Further, according to the present embodiment, the lower surface 40a of the slide plate 40 provided on the lower surface 22b of the bridge leg portion 22 is inclined so as to descend in the direction away from the bridge wheel 21, so that the bridge leg The relative displacement of the portion 22 in the substantially horizontal direction can be suppressed. Moreover, the slide plate 40 can be made to function as a guide for returning the bridge wheel 21 on the bridge rail 10, and the recovery work after an earthquake can be performed easily.

  Furthermore, according to the present embodiment, when the seismic force applied is large, the side surface of the bridge leg portion 22 is brought into contact with the contact surface 60a of the floor side fixing portion 60 provided on the side of the bridge leg portion 22. 22a contacts. Accordingly, the bridge leg portion 22 can be securely held, and the lower surface 40a of the slide plate 40 can be prevented from being detached from the bridge rail 10.

  In the present embodiment, the example in which the floor side fixing portion 60 is provided outside the bridge leg portion 22 (on the side opposite to the reactor pool 2) has been described. However, the present invention is not limited to this, and the floor side fixing portion 60 may be provided inside the bridge leg portion 22 (on the reactor pool 2 side). Furthermore, the floor side fixing part 60 may be provided outside and inside the bridge leg part 22. In this case, the bridge leg portion 22 can be held more reliably.

  In the present embodiment, a cushioning member (not shown) such as a urethane pad may be interposed between the side surface 22a of the bridge leg portion 22 and the contact surface 60a of the floor side fixing portion 60. In this case, the buffer member may be attached to at least one of the side surface 22 a of the bridge leg portion 22 or the contact surface 60 a of the floor side fixing portion 60.

Second Embodiment Next, a fuel exchanger according to a second embodiment of the present invention will be described with reference to FIGS.

  In the fuel exchanger according to the second embodiment shown in FIGS. 6 to 8, the bridge leg is mainly provided with a force absorbing mechanism capable of absorbing a force in a direction perpendicular to the longitudinal direction of the bridge rail. Otherwise, the other configuration is substantially the same as that of the first embodiment shown in FIGS. 6 to 8, the same parts as those of the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 6, a guide member 70 extending along the longitudinal direction of the bridge rail 10 is provided on the side (outside) of the bridge leg portion 22. The guide member 70 is fixed to the floor 3 using anchor bolts 71. The guide member 70 has a horizontal guide surface 70a formed substantially horizontally and a vertical guide surface 70b connected to the horizontal guide surface 70a and formed substantially vertical.

  Between the bridge leg 22 and the guide member 70, a force absorbing mechanism 80 capable of absorbing a force in a direction orthogonal to the longitudinal direction of the bridge rail 10 is interposed. The force absorbing mechanism 80 is formed in a rectangular shape with a leg-side end 81 swingably attached to the bridge leg 22, and is slidable on the horizontal guide surface 70 a and the vertical guide surface 70 b of the guide member 70. And a guide-side end portion 82. Of these, the leg-side end 81 is attached to the bridge leg using a pin 83.

  A force absorbing portion 84 capable of absorbing a force in a direction orthogonal to the longitudinal direction of the bridge rail 10 is connected between the leg side end portion 81 and the guide side end portion 82. The force absorbing portion 84 includes an oil damper 85 and a coil spring 86. Among these, the oil damper 85 includes a damper main body 85a connected to the leg-side end 81, and a piston rod 85b extending from the damper main body 85a. A guide side end 82 is attached to the tip of the piston rod 85b using a pin 87, and the guide side end 82 is swingable with respect to the piston rod 85b.

  The first spring mounting member 88 is fixed to the damper main body 85a of the oil damper 85, the second spring mounting member 89 is fixed to the piston rod 85b, and the coil spring 86 includes the first spring mounting member 88 and the second spring mounting member. 89. The coil spring 86 is attached to be compressed during normal operation. As a result, the leg side end 81 is swingable to the bridge leg 22 and the guide side end 82 is swingable to the piston rod 85b of the oil damper 85. 82 abuts on the horizontal guide surface 70 a and the vertical guide surface 70 b of the guide member 70.

  As shown in FIG. 7, the force absorbing mechanism 80 is attached to both ends of the bridge leg 22 (the front end and the rear end in the traveling direction of the bridge 20). In FIG. 7, the force absorbing mechanism 80 is shown in a simplified manner. Further, as shown in FIG. 8, in the present embodiment, the guide members 70 are respectively provided on the outer sides of the bridge legs 22, and the force absorbing mechanism 80 is symmetrical so as to correspond to each guide member 70. Is provided.

  As shown in FIG. 7, the slide plate 40 in the present embodiment is disposed between the bridge wheel and the force absorbing mechanism 80.

  When the bridge 20 travels during normal operation in such a fuel exchanger 1, the guide side end portion 82 slides on the horizontal guide surface 70a and the vertical guide surface 70b of the guide member 70 provided on the floor 3. Thus, the bridge 20 can smoothly travel on the bridge rail 10.

  On the other hand, when a substantially horizontal seismic force is applied, when the trigger pin 52 (see FIG. 3) is removed, the bridge leg 22 is substantially horizontal with respect to the bridge rail 10 (for example, FIG. 6 and FIG. 8 in the left direction). In this case, one (left side in FIG. 8) of the pair of bridge legs 22 moves away from the reactor pool 2 and the other (right side in FIG. 8) bridge leg 22 is Move to the reactor pool 2 side.

  When the bridge leg 22 is relatively displaced by a predetermined distance, the bridge wheel 21 is detached from the bridge rail 10, and the lower surface 40 a of the slide plate 40 provided on the lower surface 22 b of the bridge leg 22 is slid on the bridge rail 10. Moves and skids. During this time, the guide side end portion 82 of the force absorbing mechanism 80 provided on the one bridge leg portion 22 is in contact with the horizontal guide surface 70a and the vertical guide surface 70b of the guide member 70, so that the force absorbing mechanism 80 The substantially horizontal seismic force can be absorbed by the damping action by the oil damper 85 and the elastic action by the coil spring 86.

  When a substantially horizontal seismic force is applied in the right direction in FIGS. 6 and 8, the force absorbing mechanism 80 provided on the other (right) bridge leg 22 shown in FIG. It can absorb horizontal seismic force.

  Thus, according to the present embodiment, when an earthquake occurs and an earthquake force is applied in a substantially horizontal direction orthogonal to the longitudinal direction of the bridge rail 10, the bridge leg 22 and the bridge rail 10 are A relative horizontal displacement occurs between the guide side end 82 of the force absorbing mechanism 80 and the horizontal guide surface 70a and the vertical guide surface 70b of the guide member 70 provided on the floor 3, and the force absorbing mechanism. The substantially horizontal seismic force can be absorbed by the damping action of the 80 oil damper 85 and the elastic action of the coil spring 86. Thereby, the seismic force applied to the bridge 20 and the trolley 32 can be reduced, and the seismic performance can be improved.

  Further, according to the present embodiment, the slide plate 40 is attached to the lower surface 22b of the bridge leg portion 22, and the guide member 70 is provided on the side of the bridge leg portion 22. Further, the bridge leg portion 22, the guide member 70, By interposing the force absorbing mechanism 80 between them, the seismic performance of the fuel exchanger 1 is improved. Such a slide plate 40, the guide member 70, and the force absorption mechanism 80 can be easily installed at low cost in the existing fuel exchanger 1. For this reason, not only the new fuel exchanger 1 but also the existing fuel exchanger 1 can easily improve the seismic performance at low cost.

  Further, according to the present embodiment, the relative displacement of the bridge leg portion 22 in the substantially horizontal direction can be suppressed by increasing the damping coefficient of the oil damper 85 of the force absorbing mechanism 80 or the spring constant of the coil spring 86. it can. Further, by setting the spring constant of the coil spring 86 so that the natural frequency determined by the spring constant of the coil spring 86 and the mass of the entire fuel exchanger 1 is lower than the frequency that is the main component of the ground motion, the seismic motion can be reduced to the fuel exchanger 1. Can be prevented from being transmitted to In this case, the relative displacement of the bridge leg portion 22 with respect to the bridge rail 10 is increased, but by optimizing the damping coefficient of the oil damper 85, it is possible to suppress a decrease in seismic force absorption performance (seismic isolation performance). it can. Furthermore, by reducing the spring constant of the coil spring 86, the travel of the bridge 20 during normal operation can be made even smoother.

  Furthermore, according to the present embodiment, the guide side end portion 82 of the force absorbing mechanism 80 is in contact with the horizontal guide surface 70a and the vertical guide surface 70b of the guide member 70 provided on the floor 3, whereby the guide The moment loaded on the member 70 can be reduced. For this reason, the pulling-out force loaded on the anchor bolt 71 fixing the guide member 70 to the floor 3 can be reduced, and the seismic performance can be improved.

  In the present embodiment, the example in which the force absorbing portion 84 includes the oil damper 85 and the coil spring 86 has been described. However, the present invention is not limited to this, and instead of the oil damper 85, a highly viscous fluid damper, a viscoelastic damper, an elastic-plastic damper, a friction damper, a magnetic damper, a high damping rubber, or the like may be used. Instead of the coil spring 86, a volume elastic spring such as a laminated rubber, a disc spring, a leaf spring, a resin spring, a magnetic spring, an air spring, a resin block, or a metal block may be used. Furthermore, you may make it comprise the force absorption part 84 using only one of the damper and the spring mentioned above.

  In the present embodiment, the guide member 70 is provided outside the bridge leg portion 22 (on the side opposite to the reactor pool 2), and the force absorbing mechanism 80 is provided so as to correspond to this. Explained. However, the present invention is not limited to this, and the guide member 70 may be provided inside the bridge leg portion 22 (reactor pool 2 side), and the force absorbing mechanism 80 may be provided correspondingly. good.

Third Embodiment Next, referring to FIG. 9, a fuel changer according to a third embodiment of the present invention will be described.

  The fuel exchanger according to the third embodiment shown in FIG. 9 is mainly different in that the guide side end portion has a guide roller that can freely roll on the guide member. This is substantially the same as the second embodiment shown in FIG. In FIG. 9, the same parts as those of the second embodiment shown in FIGS. 6 to 8 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 9, the guide side end portion 82 of the force absorbing mechanism 80 has a guide roller 90 that can roll on the guide member 70. The outer peripheral surface of the guide roller 90 is formed in an arc shape, and can freely roll on the horizontal guide surface 70a and the vertical guide surface 70b of the guide member 70.

  In such a refueling machine 1, when a substantially horizontal seismic force is applied and the trigger pin 52 (see FIG. 3) is removed, the bridge leg 22 is relatively displaced with respect to the bridge rail 10 in the substantially horizontal direction. To do. In this case, when the bridge leg portion 22 is relatively displaced by a predetermined distance, the bridge wheel 21 is detached from the bridge rail 10, and the lower surface of the slide plate 40 provided on the lower surface 22 b of the bridge leg portion 22 on the bridge rail 10. 40a slides and slides sideways. During this time, the guide roller 90 of the force absorbing mechanism 80 provided on the one bridge leg portion 22 is in contact with the horizontal guide surface 70a and the vertical guide surface 70b of the guide member 70. A substantially horizontal seismic force can be absorbed by the damping action by the damper 85 and the elastic action by the coil spring 86.

  Thus, according to the present embodiment, when an earthquake occurs and an earthquake force is applied in a substantially horizontal direction orthogonal to the longitudinal direction of the bridge rail 10, the bridge leg 22 and the bridge rail 10 are A relative horizontal displacement occurs between the guide rollers 90 of the force absorbing mechanism 80 and the horizontal guide surface 70a and the vertical guide surface 70b of the guide member 70 provided on the floor 3. The substantially horizontal seismic force can be absorbed by the damping action of the oil damper 85 and the elastic action of the coil spring 86. Thereby, the seismic force applied to the bridge 20 and the trolley 32 can be reduced, and the seismic performance can be improved.

  Further, according to the present embodiment, since the guide roller 90 of the force absorbing mechanism 80 is in contact with the horizontal guide surface 70a and the vertical guide surface 70b of the guide member 70 provided on the floor 3, the bridge 20 During traveling, the guide roller 90 rolls on the horizontal guide surface 70 a and the vertical guide surface 70 b of the guide member 70. Thus, the bridge 20 can smoothly travel on the bridge rail 10.

Fourth Embodiment Next, referring to FIG. 10, a fuel changer according to a fourth embodiment of the present invention will be described.

  The fuel exchanger in the fourth embodiment shown in FIG. 10 is mainly different in that the guide-side end portion is separated from the vertical guide surface of the guide member. Other configurations are the same as those in FIGS. This is substantially the same as the second embodiment shown in FIG. In FIG. 10, the same parts as those of the second embodiment shown in FIGS. 6 to 8 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 10, the adjustment is made between the first spring mounting member 88 fixed to the damper main body 85a of the oil damper 85 of the force absorbing mechanism 80 and the second spring mounting member 89 fixed to the piston rod 85b. Bolt 91 is connected. In the present embodiment, the adjustment bolt 91 is inserted into the bolt hole 89a of the second spring mounting member 89 from the side opposite to the first spring mounting member 88 and is inserted into the bolt hole 88a of the first spring mounting member 88. The first spring mounting member 88 is tightened by the nut 92 on the opposite side of the second spring mounting member 89 from the second spring mounting member 89. In this way, the extension of the coil spring 86 is limited to be adjustable. As a result, a gap is formed between the guide side end portion 82 and the vertical guide surface 70 b of the guide member 70. In this way, the guide side end portion 82 of the force absorbing mechanism 80 is separated from the vertical guide surface 70 b of the guide member 70. The method of attaching the adjustment bolt 91 is not limited to the method described above, and a stud (not shown) may be used instead of the adjustment bolt 91.

  In such a refueling machine 1, when a substantially horizontal seismic force is applied and the trigger pin 52 (see FIG. 3) is removed, the bridge leg 22 is relatively displaced with respect to the bridge rail 10 in the substantially horizontal direction. To do. In this case, when the bridge leg portion 22 is relatively displaced by a predetermined distance, the bridge wheel 21 is detached from the bridge rail 10, and the lower surface of the slide plate 40 provided on the lower surface 22 b of the bridge leg portion 22 on the bridge rail 10. 40a slides and slides sideways. Further, the guide side end portion 82 of the force absorbing mechanism 80 slides on the horizontal guide surface 70 a of the guide member 70, and the guide side end portion 82 abuts on the vertical guide surface 70 b of the guide member 70. As a result, the substantially horizontal seismic force can be absorbed by the damping action by the oil damper 85 of the force absorbing mechanism 80 and the elastic action by the coil spring 86.

  Thus, according to the present embodiment, when an earthquake occurs and an earthquake force is applied in a substantially horizontal direction orthogonal to the longitudinal direction of the bridge rail 10, the bridge leg 22 and the bridge rail 10 are A relatively horizontal displacement occurs between the guide side end 82 of the force absorbing mechanism 80 and the vertical guide surface 70b of the guide member 70, and the damping action of the oil damper 85 of the force absorbing mechanism 80 and the coil spring 86 The seismic force in the substantially horizontal direction can be absorbed by the elastic action. Thereby, the seismic force applied to the bridge 20 and the trolley 32 can be reduced, and the seismic performance can be improved.

  Further, according to the present embodiment, since the guide-side end portion 82 of the force absorbing mechanism 80 is separated from the vertical guide surface 70b of the guide member 70 provided on the floor 3, the seismic force that is applied. Is small, the guide side end portion 82 does not come into contact with the vertical guide surface 70b of the guide member 70, and it is possible to prevent the bridge leg portion 22 from being loaded with seismic force.

  Furthermore, according to the present embodiment, the guide side end portion 82 of the force absorbing mechanism 80 is separated from the vertical guide surface 70 b of the guide member 70 provided on the floor 3. Thus, the bridge 20 can travel on the bridge rail 10 more smoothly.

Fifth Embodiment Next, a fuel exchanger according to a fifth embodiment of the present invention will be described with reference to FIG.

  In the refueling machine according to the fifth embodiment shown in FIG. 11, the guide roller is arranged such that its rotating surface is substantially horizontal, and is freely rollable on the vertical guide surface of the guide member. The main difference is that the other configuration is substantially the same as that of the second embodiment shown in FIGS. In FIG. 11, the same parts as those of the second embodiment shown in FIGS. 6 to 8 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 11, the leg-side end 81 of the force absorbing mechanism 80 is fixed to the bridge leg 22, and the force absorbing mechanism 80 is disposed substantially horizontally.

  Further, the guide side end portion 82 of the force absorbing mechanism 80 has a guide roller 90 that can roll on the guide member 70. The guide roller 90 is disposed so that its rotation surface is substantially horizontal, and can roll on the vertical guide surface 70 b of the guide member 70. The outer peripheral surface of the guide roller 90 is formed in an arc shape.

  As shown in FIG. 11, the adjustment is made between the first spring mounting member 88 fixed to the damper main body 85a of the oil damper 85 of the force absorbing mechanism 80 and the second spring mounting member 89 fixed to the piston rod 85b. Bolt 91 is connected. In the present embodiment, the adjustment bolt 91 is inserted into the bolt hole 89a of the second spring mounting member 89 from the side opposite to the first spring mounting member 88 and is inserted into the bolt hole 88a of the first spring mounting member 88. The first spring mounting member 88 is tightened by a nut 92 on the opposite side of the second spring mounting member 89 from the second spring mounting member 89. In this way, the extension of the coil spring 86 is limited to be adjustable. As a result, a gap is formed between the guide side end portion 82 and the vertical guide surface 70 b of the guide member 70. In this manner, the guide side end portion 82 of the force absorbing mechanism 80 is separated from the vertical guide surface 70 b of the guide member 70. The method of attaching the adjustment bolt 91 is not limited to the method described above, and a stud (not shown) may be used instead of the adjustment bolt 91.

  In such a refueling machine 1, when a substantially horizontal seismic force is applied and the trigger pin 52 (see FIG. 3) is removed, the bridge leg 22 is relatively displaced with respect to the bridge rail 10 in the substantially horizontal direction. To do. In this case, when the bridge leg portion 22 is relatively displaced by a predetermined distance, the bridge wheel 21 is detached from the bridge rail 10, and the lower surface of the slide plate 40 provided on the lower surface 22 b of the bridge leg portion 22 on the bridge rail 10. 40a slides and slides sideways. Further, the guide roller 90 of the force absorbing mechanism 80 abuts on the vertical guide surface 70 b of the guide member 70. As a result, the substantially horizontal seismic force can be absorbed by the damping action by the oil damper 85 of the force absorbing mechanism 80 and the elastic action by the coil spring 86.

  Thus, according to the present embodiment, when an earthquake occurs and an earthquake force is applied in a substantially horizontal direction orthogonal to the longitudinal direction of the bridge rail 10, the bridge leg 22 and the bridge rail 10 are A relative horizontal displacement occurs between the guide rollers 90 of the force absorbing mechanism 80 against the vertical guide surface 70b of the guide member 70, and the damping action of the oil damper 85 of the force absorbing mechanism 80 and the elasticity of the coil spring 86. The action can absorb the seismic force in the substantially horizontal direction. Thereby, the seismic force applied to the bridge 20 and the trolley 32 can be reduced, and the seismic performance can be improved.

  Further, according to the present embodiment, since the guide roller 90 of the force absorbing mechanism 80 is separated from the vertical guide surface 70b of the guide member 70 provided on the floor 3, the applied seismic force is applied. When it is small, the guide roller 90 does not contact the vertical guide surface 70 b of the guide member 70, and it is possible to prevent the bridge leg 22 from being applied with an earthquake force.

  Furthermore, according to the present embodiment, the guide roller 90 of the force absorbing mechanism 80 is separated from the vertical guide surface 70 b of the guide member 70 provided on the floor 3. As a result, the bridge 20 can travel more smoothly on the bridge rail.

Sixth Embodiment Next, a fuel changer according to a sixth embodiment of the present invention will be described with reference to FIG.

  In the refueling machine according to the sixth embodiment shown in FIG. 12, the guide member has a vertical plate extending substantially vertically, and the guide side end portions of the force absorbing mechanism are slidable on both surfaces of the vertical plate. The main difference is that it has a sliding surface, and the other configuration is substantially the same as that of the second embodiment shown in FIGS. In FIG. 12, the same parts as those of the second embodiment shown in FIGS. 6 to 8 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 12, the force absorbing mechanism 80 is disposed substantially horizontally. The guide member 70 has a vertical plate 93 extending substantially vertically.

  The guide side end portion 82 (guide slider) of the force absorbing mechanism 80 in the present embodiment has a pair of sliding surfaces 94 slidable on both surfaces of the vertical plate 93 of the guide member 70.

  In such a refueling machine 1, when a substantially horizontal seismic force is applied and the trigger pin 52 (see FIG. 3) is removed, the bridge leg 22 is relatively displaced with respect to the bridge rail 10 in the substantially horizontal direction. To do. In this case, when the bridge leg portion 22 is relatively displaced by a predetermined distance, the bridge wheel 21 is detached from the bridge rail 10, and the lower surface of the slide plate 40 provided on the lower surface 22 b of the bridge leg portion 22 on the bridge rail 10. 40a slides and slides sideways. Further, the sliding surface 94 of the guide side end portion 82 of the force absorbing mechanism 80 abuts on the vertical plate 93 of the guide member 70. As a result, the substantially horizontal seismic force is absorbed by the damping action by the oil damper 85 of the force absorbing mechanism 80 and the elastic action by the coil spring 86.

  Thus, according to the present embodiment, when an earthquake occurs and an earthquake force is applied in a substantially horizontal direction orthogonal to the longitudinal direction of the bridge rail 10, the bridge leg 22 and the bridge rail 10 are A substantially horizontal relative displacement occurs between them, and the sliding surface 94 of the guide side end portion 82 of the force absorbing mechanism 80 comes into contact with the vertical plate 93 of the guide member 70, and the damping action of the oil damper 85 of the force absorbing mechanism 80. In addition, the substantially horizontal seismic force can be absorbed by the elastic action of the coil spring 86. Thereby, the seismic force applied to the bridge 20 and the trolley 32 can be reduced, and the seismic performance can be improved.

  Further, according to the present embodiment, the sliding surface 94 of the guide side end portion 82 of the force absorbing mechanism 80 is slidable on the vertical plate 93 of the guide member 70. Thus, the bridge 20 can smoothly travel on the bridge rail 10.

Seventh Embodiment Next, a fuel changer according to a seventh embodiment of the present invention will be described with reference to FIG.

  In the fuel changer according to the seventh embodiment shown in FIG. 13, the guide member has a vertical plate extending substantially vertically, and the guide side end portions of the force absorbing mechanism are slidable on both surfaces of the vertical plate. The main difference is that it has a sliding surface and the bridge wheel has a width wider than the width of the bridge rail. Other configurations are substantially the same as those of the second embodiment shown in FIGS. It is. In FIG. 13, the same parts as those of the second embodiment shown in FIGS. 6 to 8 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 13, the force absorbing mechanism 80 is disposed substantially horizontally. The guide member 70 has a vertical plate 93 extending substantially vertically.

  The guide side end portion 82 (guide slider) of the force absorbing mechanism 80 in the present embodiment has a pair of sliding surfaces 94 slidable on both surfaces of the vertical plate 93 of the guide member 70.

  As shown in FIG. 13, the bridge wheel 21 has a width wider than the width of the bridge rail 10. In the present embodiment, the slide plate 40 (see FIG. 2 and the like) is not provided on the lower surface 22b of the bridge leg portion 22.

  In such a refueling machine 1, when a substantially horizontal seismic force is applied and the trigger pin 52 (see FIG. 3) is removed, the bridge leg 22 is relatively displaced with respect to the bridge rail 10 in the substantially horizontal direction. To do. In this case, when the bridge leg portion 22 is relatively displaced by a predetermined distance, the bridge wheel 21 slides on the bridge rail 10 and slides sideways. Further, the sliding surface 94 of the guide side end portion 82 of the force absorbing mechanism 80 abuts on the vertical plate 93 of the guide member 70. As a result, the substantially horizontal seismic force can be absorbed by the damping action by the oil damper 85 of the force absorbing mechanism 80 and the elastic action by the coil spring 86.

  Thus, according to the present embodiment, when an earthquake occurs and an earthquake force is applied in a substantially horizontal direction orthogonal to the longitudinal direction of the bridge rail 10, the bridge leg 22 and the bridge rail 10 are A substantially horizontal relative displacement occurs between them, and the sliding surface 94 of the guide side end portion 82 of the force absorbing mechanism 80 comes into contact with the vertical plate 93 of the guide member 70, and the damping action of the oil damper 85 of the force absorbing mechanism 80. In addition, the substantially horizontal seismic force can be absorbed by the elastic action of the coil spring 86. Thereby, the seismic force applied to the bridge 20 and the trolley 32 can be reduced, and the seismic performance can be improved.

  Further, according to the present embodiment, the fuel exchanger 1 is provided by providing the guide member 70 on the side of the bridge leg 22 and interposing the force absorbing mechanism 80 between the bridge leg 22 and the guide member 70. The seismic performance can be improved. Such a guide member 70 and the force absorbing mechanism 80 can be easily installed at low cost in the existing fuel exchanger 1. For this reason, not only the new fuel exchanger 1 but also the existing fuel exchanger 1 can easily improve the seismic performance at low cost.

  Further, according to the present embodiment, the sliding surface 94 of the guide side end portion 82 of the force absorbing mechanism 80 is slidable on the vertical plate 93 of the guide member 70. Thus, the bridge 20 can smoothly travel on the bridge rail 10.

  Furthermore, according to the present embodiment, the bridge wheel 21 has a width wider than the width of the bridge rail 10. As a result, even when a substantially horizontal relative displacement occurs between the bridge leg 22 and the bridge rail 10, it is possible to prevent the bridge wheel 21 from being removed from the bridge rail 10. .

Eighth Embodiment Next, a fuel changer according to an eighth embodiment of the present invention will be described with reference to FIGS.

  In the fuel changer according to the eighth embodiment shown in FIGS. 14 and 15, a force absorbing mechanism capable of absorbing force in a direction perpendicular to the longitudinal direction of the bridge rail is provided on the side surface of the bridge leg. However, the other configurations are substantially the same as those of the first embodiment shown in FIGS. 14 and 15, the same parts as those of the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 14, a guide member 70 extending along the longitudinal direction of the bridge rail 10 is provided on the side (outside) of the bridge leg portion 22. The guide member 70 is fixed to the floor 3 using anchor bolts 71. The guide member 70 has a horizontal guide surface 70a formed substantially horizontally and a vertical guide surface 70b connected to the horizontal guide surface 70a and formed substantially vertical.

  A force absorbing mechanism 100 capable of absorbing a force in a direction perpendicular to the longitudinal direction of the bridge rail 10 between the side surface 22a outside the bridge leg portion 22 (opposite to the reactor pool 2) and the guide member 70. Is intervened. The force absorbing mechanism 100 is disposed substantially horizontally, and is slidable on a mounting base (leg portion side end) 101 attached to the side surface 22 a of the bridge leg portion 22 and a vertical guide surface 70 b of the guide member 70. A slide pad (guide side end) 102 is provided. During normal operation, the slide pad 102 is separated from the vertical guide surface 70 b of the guide member 70, and a gap is formed between the slide pad 102 and the vertical guide surface 70 b of the guide member 70.

  A force absorbing portion 104 capable of absorbing a force in a direction orthogonal to the longitudinal direction of the bridge rail 10 is connected between the mounting base 101 and the slide pad 102. The force absorbing unit 104 includes an oil damper 105 and a coil spring 106. Among these, the oil damper 105 includes a damper main body 105a connected to the mounting base 101, and a piston rod 105b extending from the damper main body 105a. A slide pad 102 is attached to the tip of the piston rod 105b.

  The first spring mounting member 108 is fixed to the damper main body 105a of the oil damper 105, the second spring mounting member 109 is fixed to the piston rod 105b, and the coil spring 86 includes the first spring mounting member 108 and the second spring mounting member. 109. The coil spring 106 is attached so as to be compressed during normal operation.

  As shown in FIG. 14, the bridge wheel 21 has a width wider than the width of the bridge rail 10. In the present embodiment, the slide plate 40 (see FIG. 2) is not provided on the lower surface 22b of the bridge leg 22.

  In the present embodiment, four force absorbing mechanisms 100 are attached to the outer side surface 22 a of the bridge leg 22. 14 and 15 show a state in which the force absorbing mechanism 100 is attached to one bridge leg 22 of the pair of bridge legs 22, but the outer side surface of the other bridge leg 22. Similarly, four force absorbing mechanisms 100 are attached to 22a, and the force absorbing mechanisms 100 are attached symmetrically. Similarly, in FIG. 15, the force absorbing mechanism 100 is shown in a simplified manner.

  In such a refueling machine 1, when a substantially horizontal seismic force is applied and the trigger pin 52 (see FIG. 3) is removed, the bridge leg 22 is relatively displaced with respect to the bridge rail 10 in the substantially horizontal direction. To do. In this case, when the bridge leg portion 22 is relatively displaced, the bridge wheel 21 slides on the bridge rail 10 and slides sideways. Further, when the bridge leg portion 22 is relatively displaced more than the gap between the slide pad 102 and the vertical guide surface 70 b of the guide member 70, the slide pad 102 of the force absorbing mechanism 100 comes into contact with the vertical guide surface 70 b of the guide member 70. . As a result, a substantially horizontal seismic force can be absorbed by the damping action by the oil damper 105 of the force absorbing mechanism 100 and the elastic action by the coil spring 106.

  Thus, according to the present embodiment, when an earthquake occurs and an earthquake force is applied in a substantially horizontal direction orthogonal to the longitudinal direction of the bridge rail 10, the bridge leg 22 and the bridge rail 10 are A substantially horizontal relative displacement occurs between the slide pad 102 of the force absorbing mechanism 100 and the vertical guide surface 70b of the guide member 70, and the damping action of the oil damper 105 and the elastic action of the coil spring 106 of the force absorbing mechanism 100. Can absorb seismic forces in a substantially horizontal direction. Thereby, the seismic force applied to the bridge 20 and the trolley 32 can be reduced, and the seismic performance can be improved.

  Further, according to the present embodiment, since the slide pad 102 of the force absorbing mechanism 100 is separated from the vertical guide surface 70b of the guide member 70 provided on the floor 3, the applied seismic force is small. In this case, the slide pad 102 does not come into contact with the vertical guide surface 70b of the guide member 70, and it is possible to prevent an earthquake force from being applied to the bridge leg portion 22.

  Further, according to the present embodiment, the slide pad 102 of the force absorbing mechanism 100 is separated from the vertical guide surface 70 b of the guide member 70 provided on the floor 3. Thus, the bridge 20 can travel on the bridge rail 10 more smoothly.

  According to the present embodiment, the guide member 70 is provided on the side of the bridge leg 22, and the force absorbing mechanism 100 is interposed between the outer side surface 22 a of the bridge leg 22 and the guide member 70. Thereby, the seismic performance of the fuel exchanger 1 can be improved. Such a guide member 70 and the force absorbing mechanism 100 can be easily installed at low cost in the existing fuel exchanger 1. For this reason, not only the new fuel exchanger 1 but also the existing fuel exchanger 1 can easily improve the seismic performance at low cost.

  In the present embodiment, the example in which the four force absorbing mechanisms 100 are attached to the outer side surface 22a of the bridge leg 22 has been described. However, the present invention is not limited to this, and the structure of the fuel exchanger 1 is not limited thereto. Accordingly, the number of force absorbing mechanisms 100 attached to the outer side surface 22a of the bridge leg portion 22 can be arbitrary.

  In the present embodiment, the example in which the force absorbing portion 104 includes the oil damper 105 and the coil spring 106 has been described. However, the present invention is not limited to this, and instead of the oil damper 105, a highly viscous fluid damper, a viscoelastic damper, an elastic-plastic damper, a friction damper, a magnetic damper, a high damping rubber, or the like may be used. Instead of the coil spring 106, a volume elastic spring such as a laminated rubber, a disc spring, a leaf spring, a resin spring, a magnetic spring, an air spring, a resin block, or a metal block may be used. Furthermore, you may make it comprise the force absorption part 104 using only one of the damper and the spring mentioned above.

  As mentioned above, although embodiment by this invention has been described, naturally, within the scope of the gist of this invention, these embodiment can also be combined suitably partially. For example, the force absorbing mechanism 80 in the fourth embodiment and the force absorbing mechanism 100 in the eighth embodiment can be used in combination. Further, in the present embodiment, various modifications are possible within the scope of the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Refueling machine 2 Reactor pool 3 Floor 10 Bridge rail 10a Side surface 11 T-shape steel 12 Embedded anchor 13 Rail clip 14 Clip bolt 20 Bridge 21 Bridge wheel 22 Bridge leg part 22a Side surface 22b Lower surface 30 Trolley rail 31 Trolley wheel 32 Trolley 33 Grasping tool 40 Slide plate 40a Lower surface 50 Rail roller 51 Support 52 Trigger pin 60 Floor side fixing portion 60a Contact surface 61 Anchor bolt 70 Guide member 70a Horizontal guide surface 70b Vertical guide surface 71 Anchor bolt 80 Force absorbing mechanism 81 Leg Side end portion 82 Guide side end portion 83 Pin 84 Force absorbing portion 85 Oil damper 85a Damper body 85b Piston rod 86 Coil spring 87 Pin 88 First spring mounting member 88a Bolt hole 89 Second spring mounting member 89a Bolt hole 90 Id roller 91 Adjustment bolt 92 Nut 93 Vertical plate 94 Sliding surface 100 Force absorbing mechanism 101 Mounting base 102 Slide pad 104 Force absorbing portion 105 Oil damper 105a Damper body 105b Piston rod 106 Coil spring 108 First spring mounting member 109 Second spring Mounting member

Claims (18)

In a refueling machine that inserts or pulls out fuel rods for nuclear reactors,
A rail for the bridge installed on the floor around the reactor pool containing the fuel rods for the reactor,
A bridge wheel that travels on the bridge rail, and a bridge leg that rotatably holds the bridge wheel;
A trolley that runs on the bridge in a direction orthogonal to the bridge rail;
A grip provided on the trolley for inserting or pulling out fuel rods;
A slide portion provided on a lower surface of the bridge leg portion, disposed on both sides of an axis along the longitudinal direction of the bridge rail passing through the bridge wheel, and having a lower surface slidable on the bridge rail. ,
The fuel exchanger according to claim 1, wherein the lower surface of the slide portion is inclined so as to descend in a direction away from the axis.   2. The fuel changer according to claim 1, wherein the lower surface of the slide portion is disposed at a position higher than a lower end of the bridge wheel on the bridge wheel side. A rail roller attached to the bridge leg via a trigger member and further rollable on a side surface of the bridge rail;
The said trigger member is removed from the said leg for bridge | bridging, when the force more than predetermined value is loaded in the substantially horizontal direction orthogonal to the longitudinal direction of the said rail for bridge | bridging. The refueling machine as described.   The floor side fixing | fixed part which was provided in the side of the said bridge | bridging leg part and has the contact surface which can contact | abut to the side surface of the said bridge | bridging leg part is further provided. Refueling machine. A guide member provided on a side of the bridge leg and extending along a longitudinal direction of the bridge rail;
A force absorbing mechanism interposed between the bridge leg and the guide member and capable of absorbing a force in a direction perpendicular to the longitudinal direction of the bridge rail;
The force absorbing mechanism includes a leg side end attached to the bridge leg, a guide side end slidable on the guide member, and between the leg side end and the guide side end. 4. The fuel changer according to claim 1, further comprising: a force absorbing portion coupled to the bridge rail and capable of absorbing a force in a direction perpendicular to a longitudinal direction of the bridge rail. The guide member has a horizontal guide surface formed substantially horizontally and a vertical guide surface formed substantially vertically,
6. The fuel changer according to claim 5, wherein the guide side end portion of the force absorbing mechanism is slidable on the horizontal guide surface and the vertical guide surface of the guide member.   6. The refueling machine according to claim 5, wherein the guide side end portion of the force absorbing mechanism has a guide roller that can roll on the guide member. The guide member has a horizontal guide surface formed substantially horizontally, and a vertical guide surface connected to the horizontal guide surface and formed substantially vertical,
The fuel changer according to claim 7, wherein the guide side end portion of the force absorbing mechanism is freely rollable to the horizontal guide surface and the vertical guide surface of the guide member. The guide member has a vertical guide surface formed substantially vertically,
8. The guide roller of the force absorbing mechanism is disposed so that a rotation surface thereof is substantially horizontal, and is rollable on the vertical guide surface of the guide member. The refueling machine as described.   The refueling machine according to claim 6, 8, or 9, wherein the guide side end portion of the force absorbing mechanism is separated from the vertical guide surface of the guide member. The guide member has a vertical plate extending substantially vertically,
6. The fuel changer according to claim 5, wherein the guide side end portion of the force absorbing mechanism has a pair of sliding surfaces slidable on both surfaces of the vertical plate.   The said force absorption part has a coil spring, laminated rubber, a disc spring, a leaf | plate spring, a resin spring, a magnetic spring, a resin block, or a metal block, The Claim 5 thru | or 11 characterized by the above-mentioned. Refueling machine.   The fuel exchanger according to any one of claims 5 to 12, wherein the force absorbing portion includes a damper. In a refueling machine that inserts or pulls out fuel rods for nuclear reactors,
A rail for the bridge installed on the floor around the reactor pool containing the fuel rods for the reactor,
A bridge wheel that travels on the bridge rail, and a bridge leg that rotatably holds the bridge wheel;
A trolley that runs on the bridge in a direction orthogonal to the bridge rail;
A grip provided on the trolley for inserting or pulling out fuel rods;
A guide member provided on a side of the bridge leg and extending along a longitudinal direction of the bridge rail;
A force absorbing mechanism interposed between the bridge leg and the guide member and capable of absorbing force in a direction orthogonal to the longitudinal direction of the bridge rail;
The force absorbing mechanism includes a leg side end attached to the bridge leg, a guide side end slidable on the guide member, and between the leg side end and the guide side end. And a force absorbing portion that is capable of absorbing a force in a direction perpendicular to the longitudinal direction of the bridge rail.   The refueling machine according to claim 14, wherein the bridge wheel has a width wider than a width of the bridge rail. The guide member has a vertical plate extending substantially vertically,
The refueling machine according to claim 14 or 15, wherein the guide side end portion of the force absorbing mechanism has a pair of sliding surfaces slidable on both surfaces of the vertical plate.   The said force absorption part has a coil spring, laminated rubber, a disc spring, a leaf | plate spring, a resin spring, a magnetic spring, a resin block, or a metal block, The Claim 14 thru | or 16 characterized by the above-mentioned. Refueling machine.   The fuel exchanger according to claim 14, wherein the force absorbing portion includes a damper.

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