Anti-vibration structure

Abstract

To provide a vibration control structure which enables a floor part to be switched between a floating floor at which high vibration control effect is achieved and a fixed floor which is not displaced vertically.SOLUTION: The vibration control structure includes: a structure 2; a floor part 3 provided on the structure 2; a support spring 4 which connects the structure 2 with the floor part 3 and supports the floor part 3 in a manner that the floor part 3 can be displaced in a vertical direction relative to the structure 2; and a lock mechanism 5 which can restrain vertical displacement of the floor part 3 relative to the structure 2. The lock mechanism 5 has a jack 51 which is arranged parallel to the support spring 4. The jack 51 has: a cylinder part 53 fixed to the structure 2; and a piston part 54 which may be displaced in a vertical direction relative to the cylinder part 53. The lock mechanism 5 restrains vertical direction displacement of the floor part 3 relative to the structure 2 when the piston part 54 is in an elevated position and contacts with the floor part 3, and enables the vertical displacement of the floor part 3 relative to the structure 2 when the piston part 54 is in a descended position and separates from the floor part 3.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a vibration isolation structure. [Background technology]

[0002] In facilities such as live music halls and dance studios, vertical vibrations (so-called vertical vibrations) can occur due to the bending and stretching movements of a large number of patrons. To address this, a vibration-proof structure is known in which the floor of the relevant area is made a floating floor that is insulated from the structural body (see, for example, Patent Document 1). In this type of vibration isolation structure, the structural body is partially recessed, and a floating floor supported by springs is provided in the recessed portion. The floating floor is configured so that it can be displaced vertically relative to the structural body due to the displacement of the springs.

[0003] The reaction force reduction ratio is the ratio of the reaction force to the excitation force. The higher the excitation frequency relative to the floating floor's natural frequency f1, the smaller the reaction force reduction ratio (the greater the vibration isolation effect), so it would be possible to increase the weight of the floating floor or reduce its spring stiffness, but increasing the weight would increase costs, and reducing the spring stiffness would result in a so-called soft spring. For this reason, floating floors with vibration isolation structures that are currently in practical use have a huge RC floor slab about 1m thick, with the floor's own weight (m x g, g is the gravitational acceleration) set at 10 times the excitation force or more, and the natural frequency set at around 1Hz. This keeps the vertical displacement during normal use to around 2cm or less. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-178555 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when a facility with the above-mentioned vibration-proof structure is used for purposes other than live performances and dancing (for example, exhibitions, sporting events, etc.), there is a need for a fixed floor where vertical displacement of the floor is not desirable. Thus, there is a need for a mechanism that allows the floor to be freely switched between a floating floor with high vibration-proofing effects and a fixed floor that does not displace vertically, depending on the purpose of the facility. One idea is to manually lock the support springs that support the floating floor (by making the support springs rigid) to make it a fixed floor, but the task of manually locking all the support springs inside the pit under the floating floor is time-consuming and unrealistic.

[0006] An object of the present invention is to provide a vibration-isolating structure in which the floor section can be easily switched between a floating floor, which has a high vibration-isolating effect, and a fixed floor, which does not displace vertically. [Means for solving the problem]

[0007] In order to achieve the above object, the vibration-proof structure of the present invention comprises a structure, a floor portion provided on the structure, a support spring that connects the structure and the floor portion and supports the floor portion so that it can be displaced in a vertical direction relative to the structure, and a locking mechanism that can restrict vertical displacement of the floor portion relative to the structure, the locking mechanism having a jack arranged in parallel with the support spring, the jack having a cylinder portion fixed to the structure and a piston portion that can be displaced in an up and down direction relative to the cylinder portion, the locking mechanism restricts vertical displacement of the floor portion relative to the structure when the piston portion is in a raised position and contacts the floor portion, and allows vertical displacement of the floor portion relative to the structure when the piston portion is in a lowered position and separates from the floor portion, the floor portion becomes a fixed floor when the piston portion contacts the floor portion, and the floor portion becomes a floating floor when the piston portion separates from the floor portion, and is configured to be switchable between the fixed floor and the floating floor. When vertical vibration is expected to occur on the floor, the floor is used as a floating floor, and when vertical vibration is not expected on the floor, the floor is used as a fixed floor. It is characterized by:

[0008] In the present invention, the locking mechanism restricts the vertical displacement of the floor part relative to the structure when the piston part is in the raised position and in contact with the floor part, and allows the vertical displacement of the floor part relative to the structure when the piston part is in the lowered position and separated from the floor part. As a result, when the locking mechanism restricts the vertical displacement of the floor part relative to the structure, the floor part becomes a fixed floor, and when the locking mechanism allows the floor part to be displaced vertically relative to the structure, the floor part becomes a floating floor. In this way, in the vibration-proof structure according to the present invention, the same floor can be used as both a floating floor and a fixed floor. Also, the floor can be easily switched between a floating floor and a fixed floor by raising and lowering the piston part.

[0009] In the vibration-proof structure according to the present invention, the jack may be a remote-controlled electric jack. With this configuration, it is not necessary to switch between the floating floor and the fixed floor in the space between the structure and the floor (the space below the floor), but it can be done from above the floor or from a position away from the floor. Therefore, even if the space between the structure and the floor is dark and narrow, there is no need to perform the work in such a space.

[0010] In addition, in the vibration-proof structure of the present invention, the locking mechanism may have a sensor capable of detecting contact between the piston portion and the floor portion, and when the sensor detects contact between the piston portion and the floor portion, the locking mechanism may stop the rise of the piston portion. With this configuration, the floor part that has been vertically displaced by the load can be made a fixed floor regardless of its height, and the load acting on the piston part of the jack is only the increased load after fixing, and the load before fixing is borne by the support spring. This makes it possible to prevent the piston part from being lower than the normal position and separated from the floor part when the floor part is made a fixed floor, and also to prevent the piston part from bearing the load of the floor part more than expected.

[0011] In addition, in the vibration-proof structure of the present invention, the jack is a screw jack that has a worm screw that rotates a worm wheel and a screw shaft to which the rotation of the worm screw is transmitted via the worm wheel, and the screw shaft serves as the piston portion, and the screw shaft may be a trapezoidal screw. In this way, by using a trapezoidal screw on the screw shaft of the screw jack, a self-locking function is activated, and the motor only needs to be driven when moving the jack up and down.At other times, the motor does not need to be driven and the floor can be maintained in position without being displaced by the load acting on it.

[0012] In addition, in the vibration-proof structure of the present invention, the jack is a screw jack that has a worm screw that rotates a worm wheel and a screw shaft to which the rotation of the worm screw is transmitted via the worm wheel, and the screw shaft serves as the piston portion, and the screw shaft may be a ball screw. With this configuration, friction between the screw shaft and the worm wheel can be reduced, and the screw shaft (piston portion) can be raised and lowered efficiently and accurately.

[0013] In the vibration-proof structure according to the present invention, the jack may be a hydraulic jack. With this configuration, the piston can be raised and lowered efficiently. In this case, a self-locking function can be imparted by providing a check valve in the hydraulic hose of the hydraulic jack. Effect of the Invention

[0014] According to the present invention, the floor section can be easily switched between a floating floor, which has a high vibration-isolating effect, and a fixed floor, which does not displace vertically. [Brief description of the drawings]

[0015] [Figure 1] 1 is a vertical sectional view showing an anti-vibration structure according to a first embodiment of the present invention. [Diagram 2] FIG. 13 is a diagram showing a locking mechanism when the floor portion is a floating floor. [Diagram 3] 13 is a diagram showing a locking mechanism when the floor portion is a fixed floor. FIG. [Figure 4] FIG. [Diagram 5] FIG. 2 is a plan view of the worm screw and the worm wheel. [Figure 6] FIG. 11 is a perspective view showing a jack of a vibration-proof structure according to a second embodiment. [Figure 7] FIG. 13 is a schematic diagram showing a jack of a vibration-proof structure according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] (First embodiment) Hereinafter, a vibration-isolating structure according to an embodiment of the present invention will be described with reference to FIGS. As shown in Figure 1, the vibration-proof structure 1 of this embodiment has a structure 2, a floor 3 installed above the structure 2, a support spring 4 provided between the structure 2 and the floor 3, and a locking mechanism 5 provided between the structure 2 and the floor 3. The support spring 4 has a spring axis direction that is vertical, and connects the structure 2 and the floor 3. The support spring 4 supports the floor 3 so that it can be displaced (vibrated) in the vertical direction relative to the structure 2. The lock mechanism 5 is configured to be able to restrict vertical displacement of the floor 3 relative to the structure 2.

[0017] The vibration-proof structure 1 according to this embodiment is assumed to be adopted in buildings such as large halls, for example, with people and objects standing on the floor section 3. When this building is used for live music performances, dances, and the like, it is used as a floating floor in which vertical vibrations (so-called vertical vibrations) occur in the floor section 3 when the floor section 3 is vibrated by a large number of people bending and stretching on top of the floor section 3 to the music. When this building is used for exhibitions, sporting events, and the like, the floor section 3 is used as a fixed floor that does not vibrate vertically.

[0018] The structure 2 is constructed of reinforced concrete, for example, on a foundation. In this embodiment, the structure 2 is formed with a recess 21 that opens upward. The structure 2 has a bottom plate portion 22 located below the recess 21, and a side wall portion 23 located to the side of the recess 21 and extending upward from the peripheral portion of the bottom plate portion 22. The upper surface of the bottom plate portion 22 is formed horizontally. A plurality of support springs 4 and lock mechanisms 5 are provided on the top of the bottom plate portion 22.

[0019] The floor portion 3 is formed in a flat plate shape and is disposed in the recess 21 of the structure 2 with the plate surface oriented horizontally. The floor portion 3 is disposed above and overlapping the bottom plate portion 22 with a gap therebetween. A support spring 4 and a locking mechanism 5 are provided between the bottom plate portion 22 and the floor portion 3. The support springs 4 are arranged in parallel at intervals in the horizontal direction. The support springs 4 connect the bottom plate portion 22 and the floor portion 3.

[0020] The lock mechanism 5 is provided in parallel with the support spring 4 . The locking mechanism 5 has a jack 51, a sensor 52 attached to the jack 51, and a control unit (not shown) that controls the operation of the jack 51. A plurality of jacks 51 are provided and are disposed near each of the plurality of support springs 4. The control unit is configured to be able to simultaneously control the plurality of jacks 51. The sensor 52 is provided for each of the plurality of jacks 51.

[0021] The jack 51 is a remotely operable electric jack. The jack 51 has a cylinder portion 53 fixed to the bottom plate portion 22 of the structure 2 and a piston portion 54 that is displaceable (movable up and down) in the vertical direction relative to the cylinder portion 53. In this embodiment, a rising portion 24 made of RC is provided on the bottom plate portion 22, and a hole portion 25 that opens upward is provided in this rising portion 24. The lower side of the cylinder portion 53 is inserted into the hole portion 25 with the axial direction oriented vertically.

[0022] As shown in FIG. 2, a plate 56 is attached to the upper end surface of the piston portion 54, and a rubber sheet 57 for uneven surfaces is attached thereon. The plate 56 is a flat plate, for example a steel plate, and is attached to the upper end surface of the piston portion 54 with the plate surface oriented horizontally. The plate 56 is formed so that its shape in a plan view is larger than the shape of the piston portion 54 in a plan view, and its peripheral portion protrudes outward beyond the peripheral portion of the piston portion 54. The rubber sheet 57 is formed in a sheet shape having a thickness of, for example, about 10 mm, and is attached to the upper surface of the plate 56 with the plate surface oriented in a horizontal plane. The rubber sheet 57 is attached to the central portion of the plate 56 excluding the peripheral portion.

[0023] The piston portion 54 is inserted into the cylinder portion 53 so as to be displaceable in the vertical direction with its axial direction oriented vertically. When the piston portion 54 is in an elevated position on the upper side of its range of displacement, as shown in Fig. 2, its upper end portion (rubber sheet 57) comes into contact with the underside of the floor portion 3, and when the piston portion 54 is in a lowered position lower than the elevated position, as shown in Fig. 3, its upper end portion (rubber sheet 57) comes away from the underside of the floor portion 3.

[0024] The locking mechanism 5 is configured so that when the piston portion 54 is in the raised position and comes into contact with the floor portion 3, it restrains the floor portion 3 from moving vertically relative to the structure 2 (see Figure 2), and when the piston portion 54 is in the lowered position and moves away from the floor portion 3, it allows the floor portion 3 to be displaced vertically relative to the structure 2 (see Figure 3). When the locking mechanism 5 restricts the vertical displacement of the floor section 3 relative to the structure 2, the floor section 3 becomes a fixed floor (see Figure 2), and when the locking mechanism 5 allows the vertical displacement of the floor section 3 relative to the structure 2, the floor section 3 becomes a floating floor (see Figure 3). In this embodiment, when the floor portion 3 becomes a fixed floor, the piston portion 54 bears the load of the floor portion 3 and the people and objects placed on the floor portion 3 that are subsequently applied.

[0025] 4, the jack 51 is a screw jack 55. The screw jack 55 (jack 51) has a worm wheel 551, a worm screw 552 that rotates the worm wheel 551, a screw shaft 553 to which the rotation of the worm screw 552 is transmitted via the worm wheel 551, and a housing 554 that accommodates and supports these. The housing 554 corresponds to the cylinder portion 53 of the jack 51, and the screw shaft 553 corresponds to the piston portion 54 of the jack 51. The housing 554 is fixed to the rising portion 24 of the bottom plate portion 22.

[0026] 4, the worm screw 552 is a rod-shaped screw having threads 552a formed on its outer circumferential surface. The worm screw 552 is disposed so as to extend in the horizontal direction. In other words, the axis of the worm screw 552 is a horizontal axis extending in the horizontal direction. The worm screw 552 is connected to the motor 6 and rotates about its axis when driven by the motor 6. The motor 6 can be remotely operated. The worm screw 552 is rotatable about its axis relative to the housing 554, but displacement in the axial direction is restricted.

[0027] The worm wheel 551 is formed in a cylindrical shape having a hole 551a in the center. The worm wheel 551 has threads 551b, 551c formed on the outer peripheral surface and the inner peripheral surface, respectively. The worm wheel 551 is disposed such that its axis extends in the vertical direction. In other words, the axis of the worm wheel 551 is a vertical axis. A thread 551b on the outer circumferential surface of the worm wheel 551 is engaged with a thread 552a of the worm screw 552. The worm wheel 551 is rotatable about its axis relative to the housing 554, but displacement in the axial direction is restricted.

[0028] The screw shaft 553 is a rod-shaped screw having a screw 553a formed on the outer circumferential surface. The screw 553a of the screw shaft 553 is a trapezoidal screw. The screw shaft 553 is disposed so as to extend in the vertical direction. That is, the axis of the screw shaft 553 is a vertical axis extending in the vertical direction. The screw shaft 553 is inserted into a hole 551a of the worm wheel 551 and is disposed coaxially with the worm wheel 551. A screw 553a on the outer circumferential surface of the screw shaft 553 is screwed into a screw 551c on the inner circumferential surface of the worm wheel 551. The screw shaft 553 is movable in the axial direction relative to the housing 554, but is restricted from rotating about the axis.

[0029] In such a screw jack 55, when the motor 6 is driven, the worm screw 552 rotates about a horizontal axis, and the worm wheel 551 meshing with the worm screw 552 rotates about a vertical axis, as shown in Fig. 5. At this time, since the number of rotations (rotational speed) of the worm wheel 551 is extremely small compared to the number of rotations (rotational speed) of the worm screw 552, a torque several tens of times that of the worm screw 552 is generated in the worm wheel 551. 4, when the worm wheel 551 rotates about the vertical axis, the screw shaft 553, whose rotation about the vertical axis is restricted, moves in the vertical direction. That is, since the screw shaft 553 is the piston portion 54, when the motor 6 is driven, the piston portion 54 moves up and down.

[0030] As shown in FIGS. 2 and 3, the sensor 52 is configured to be able to detect when the upper end portion (rubber sheet 57) of the piston portion 54 comes into contact with the floor portion 3. Sensor 52 is attached to the side of plate 56 provided at the upper end of piston portion 54. Sensor 52 is a known microswitch, and has lever 521 that is pressed by an external force. When lever 521 is pressed into a pressed position, sensor 52 switches ON, and when lever 521 is not pressed into an initial position, sensor 52 switches OFF. The sensor 52 rises together with the piston portion 54. Therefore, as shown in Fig. 2, when the piston portion 54 is in the raised position, the lever 521 of the sensor 52 comes into contact with the stainless steel plate 31 attached to the underside of the floor portion 3, assumes a pressing position, and the switch is turned ON. Also, as shown in Fig. 3, when the piston portion 54 is in a lowered position that is lower than the raised position, the lever 521 of the sensor 52 takes the initial position away from the stainless steel plate 31, and the switch is turned OFF.

[0031] As described above, in this embodiment, the lever 521 of the sensor 52 (microswitch) does not directly contact the underside of the floor 3, but contacts the stainless steel plate 31 attached to the underside of the floor 3. In this embodiment, the position of the sensor 52 is adjusted so that after the piston portion 54 rises and the rubber sheet 57 at the upper end of the piston portion 54 contacts the underside of the floor 3, the lever 521 of the sensor 52 contacts the stainless steel plate 31 and assumes a pressing position. The sensor 52 detects that the piston portion 54 has come into contact with the floor portion 3 when the switch is turned ON, and detects that the piston portion 54 has left the floor portion 3 when the switch is turned OFF.

[0032] The control unit is configured to be able to receive a detection signal from the sensor 52. When the control unit receives a signal that detects that the piston portion 54 has come into contact with the floor portion 3 while controlling the elevation of the piston portion 54, the control unit controls the piston portion 54 to stop ascending. It is desirable to control the lifting of the piston portion 54 before placing objects such as exhibits on the floor portion 3. In addition, it is desirable to set the load acting on the jack 51 from the floor portion 3 to 1 / 10 of the floor portion 3's own weight or less.

[0033] Next, the operation and effect of the vibration-proof structure 1 according to the present embodiment will be described. In the vibration-proof structure 1 according to the present embodiment described above, when the piston portion 54 is in the raised position, the locking mechanism 5 comes into contact with the floor portion 3 to restrict vertical displacement of the floor portion 3 relative to the structure 2, and when the piston portion 54 is in the lowered position, it separates from the floor portion 3 to allow vertical displacement of the floor portion 3 relative to the structure 2. When the locking mechanism 5 restricts vertical displacement of the floor portion 3 relative to the structure 2, the floor portion 3 becomes a fixed floor, and when the locking mechanism 5 allows vertical displacement of the floor portion 3 relative to the structure 2, the floor portion 3 becomes a floating floor. In this way, in the vibration-proof structure 1 according to this embodiment, the same floor portion 3 can be used as both a floating floor and a fixed floor. Also, by raising and lowering the piston portion 54, the floor portion 3 can be easily switched between a floating floor and a fixed floor.

[0034] Furthermore, the task of switching the floor section 3 between a floating floor and a fixed floor can be easily performed, and since it can be performed before an event is held in a building that employs the vibration-proof structure 1, there is no need to operate the jack 51 at high speed. Therefore, even if the capacity of the motor 6 is small, switching between a floating floor and a fixed floor is possible, and the switching task can be performed at low cost. Furthermore, the vibration-proof structure 1 of this embodiment can be constructed by simply adding the locking mechanism 5 to an existing floor portion, and therefore can be easily adopted to the floor portion of an existing structure.

[0035] In the vibration-proof structure 1 according to this embodiment, the jack 51 is a remotely operable electric jack. With this configuration, it is not necessary to switch the floor section 3 between a floating floor and a fixed floor in the space between the structure 2 and the floor section 3, but it can be done from above the floor section 3 or from a position away from the floor section 3. Therefore, even if the space between the structure 2 and the floor section 3 is dark and narrow, there is no need to perform the work in such a space.

[0036] Furthermore, in the vibration-proof structure 1 according to this embodiment, the locking mechanism 5 has a sensor 52 capable of detecting contact between the piston portion 54 and the floor portion 3, and is configured to stop the rise of the piston portion 54 when the sensor 52 detects contact between the piston portion 54 and the floor portion 3. With this configuration, the position of the piston portion 54 when the floor portion 3 is made into a fixed bed can be appropriately controlled regardless of the weight loaded on the floor portion 3. This makes it possible to prevent the piston portion 54 from being separated from the floor portion 3 when the floor portion 3 is made into a fixed bed, and also makes it possible to prevent the piston portion 54 from bearing the load of the floor portion 3 more than expected.

[0037] In the vibration-proof structure 1 according to this embodiment, the jack 51 is a screw jack 55 having a worm screw 552 that rotates the worm wheel 551 and a screw shaft 553 to which the rotation of the worm screw 552 is transmitted via the worm wheel 551, the screw shaft 553 serving as the piston portion 54. The screw 553a on the outer circumferential surface of the screw shaft 553 is a trapezoidal screw. In this way, by using a trapezoidal screw for the screw 553a of the screw shaft 553 of the screw jack 55, a self-locking function is achieved, and the motor 6 needs to be driven only when the jack 51 is raised or lowered. At other times, the motor 6 does not need to be driven, and the floor 3 can be maintained in position without being displaced by the load acting on it.

[0038] In addition, the trapezoidal screw used in the screw 553a of the screw shaft 553 (piston portion 54) has a low screw efficiency, so the self-locking function (self-retaining function) works anywhere within the stroke. This means that there is no risk of reverse operation (the screw rotating in the reverse direction due to the load) even if a load acts on the jack 51, because the friction of the screw is large. Therefore, even if the load acting on the jack 51 changes, the jack 51 does not displace, and there is an advantage that the load can be supported without moving vertically regardless of the height of the floor portion 3.

[0039] Second embodiment Next, other embodiments will be described based on the attached drawings. The same or similar components and parts as those in the first embodiment described above will be designated by the same reference numerals, and their description will be omitted. Only configurations that differ from the embodiment will be described. 6, in the vibration-proof structure according to the second embodiment, a screw jack 55B is used as a jack 51B of a locking mechanism 5B, and a screw shaft 553B is a ball screw. A ball 555 is provided between a screw 553Ba on the outer circumferential surface of the screw shaft 553B and a screw 551Bc on the inner circumferential surface of a worm wheel 551B. In the second embodiment, the thread 553Ba on the outer circumferential surface of the screw shaft 553B is not a trapezoidal thread. The position where the lock mechanism 5B is provided and the action of the lock mechanism 5B are similar to those of the lock mechanism 5 in the first embodiment. The cylinder portion is indicated by 53B in the drawing.

[0040] The vibration-proof structure according to the second embodiment provides the same effects as the first embodiment described above, and because the screw shaft 553B of the jack 51B is a ball screw, friction between the screw shaft 553B and the worm wheel 551B can be reduced, and the screw shaft 553B (piston portion 54B) can be raised and lowered efficiently and accurately. Furthermore, since the ball screw has high screw efficiency, loss is reduced and the load on the motor 6 can be reduced.

[0041] In addition, since the ball screw has high screw efficiency, the load acting on the screw shaft 553B may cause the worm screw 552B to rotate, causing the screw shaft 553B to move (sink downward), which may cause the self-locking mechanism to fail to function. For this reason, it is preferable to add a separate brake mechanism to prevent the worm screw 552B from rotating.

[0042] Third embodiment In the vibration-proof structure according to the third embodiment, as shown in FIG. 7, a hydraulic jack 7 is used as a jack 51C of a locking mechanism 5C, instead of a screw jack. The hydraulic jack 7 (jack 51C) is configured to operate a hydraulic pump 71 to raise the piston portion 54C, and to have a self-locking mechanism by providing a check valve 73 in a hose 72 connecting the hydraulic pump 71 and the hydraulic jack 7, and to lower the piston portion 54C by operating an electromagnetic valve 74 (relief valve) provided in the hose 72.

[0043] When the piston portion 54C of the jack 51C is raised, the motor 76 of the hydraulic pump 71 is driven to send oil from a tank 77 to the hydraulic jack 7 via a check valve 73. When a limit switch provided on the hydraulic jack 7 is turned ON (when the jack 51C comes into contact with the floor 3), the hydraulic pump 71 is stopped. Even when the hydraulic pump 71 is stopped, the check valve 73 prevents oil from flowing back, so the jack 51 continues to hold its load without moving. When the piston portion 54 of the jack 51 is lowered, the solenoid valve 74 (relief valve) is opened to return the oil to the tank 77 . The position where the lock mechanism 5C is provided and the action of the lock mechanism 5C are similar to those of the lock mechanism 5 in the first embodiment. The cylinder portion is indicated by 53C in the drawing.

[0044] The vibration-proof structure according to the third embodiment has the same effects as the above-mentioned embodiments, and can efficiently raise and lower the piston portion 54C. In the vibration-proof structure 1 according to the third embodiment, a check valve 73 is provided in the hose 72, thereby providing a self-locking mechanism.

[0045] Although the embodiment of the vibration isolation structure according to the present invention has been described above, the present invention is not limited to the above embodiment and can be modified as appropriate without departing from the spirit of the present invention. For example, in the above embodiment, the floor portion is installed in the recess 21 of the structure 2 and has a side wall portion 23 of the structure 2 on the side, but it may be placed on top of the structure 2 and not have a side wall portion 23 on the side. In addition, in the above embodiment, the jack 51 is a remotely operable electric jack, but the jack 51 may be a manual jack. In addition, in the above embodiment, the jack 51 is disposed near each of the multiple support springs 4, but it is not necessarily required to dispose each of the multiple support springs 4 near each of the multiple support springs 4. In addition, the number of the jacks 51 and the support springs 5 ​​may be set appropriately. [Explanation of symbols]

[0046] 1. Anti-vibration structure 2 structure 3 Floor 5,5B,5C Locking mechanism 51, 51B, 51C Jack 52 Sensors 53 Cylinder section 54, 54B, 54C Piston section 55,55B Screw jack 551,551B Worm wheel 553,553B Screw shaft 555 Ball

Claims

1. A structure, A floor portion provided on the structure; and a support spring that connects the structure and the floor and supports the floor so as to be displaceable in a vertical direction relative to the structure; a locking mechanism capable of restricting vertical displacement of the floor portion relative to the structure, The locking mechanism includes a jack arranged in parallel with the support spring, The jack is A cylinder portion fixed to the structure; a piston portion that is vertically displaceable relative to the cylinder portion, the locking mechanism restricts vertical displacement of the floor portion relative to the structure when the piston portion is in the raised position and in contact with the floor portion, and allows vertical displacement of the floor portion relative to the structure when the piston portion is in the lowered position and separates from the floor portion, When the piston portion comes into contact with the floor portion, the floor portion becomes a fixed floor, When the piston portion separates from the floor portion, the floor portion becomes a floating floor, The fixed bed or the floating bed is switchable. When vertical vibration is expected in the floor, the floor is used as a floating floor. A vibration-proof structure characterized in that the floor portion is used as a fixed floor when vertical vibration is not expected.

2. 2. The vibration-proof structure according to claim 1, wherein the jack is a remote-controlled electric jack.

3. The vibration-proof structure described in claim 1 or 2, characterized in that the locking mechanism has a sensor capable of detecting contact between the piston portion and the floor portion, and when the sensor detects contact between the piston portion and the floor portion, stops the rise of the piston portion.

4. The jack is a screw jack having a worm screw that rotates a worm wheel and a screw shaft to which the rotation of the worm screw is transmitted via the worm wheel, the screw shaft serving as the piston portion, 4. The vibration-proof structure according to claim 1, wherein the screw shaft is a trapezoidal screw.

5. The jack is a screw jack having a worm screw that rotates a worm wheel and a screw shaft to which the rotation of the worm screw is transmitted via the worm wheel, the screw shaft serving as the piston portion, 4. The vibration-proof structure according to claim 1, wherein the screw shaft is a ball screw.

6. 4. The vibration-proof structure according to claim 1, wherein the jack is a hydraulic jack.

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