Jack equipment and floor structure

Abstract

To provide a jack device and a floor structure by which load capacity after fixation can be improved as compared with the load capacity during lifting.SOLUTION: A jack device includes: a first wedge member formed with a first inclined surface; a second wedge member formed with a second inclined surface; a lower support part placed to be movable in a direction in which the first wedge member and the second wedge member approach to or separate from each other such that the first inclined surface faces the second inclined surface; right and left screws for connecting the first wedge member and the second wedge member with each other and moving the first wedge member and the second wedge member along an axial direction based on rotation, and an upper support part, which are formed with a third inclined surface contacting with the first inclined surface and a fourth inclined surface contacting with the second inclined surface, and moved in a vertical direction based on the movement of the first wedge member and the second wedge member.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a jack device and a floor structure. [Background technology]

[0002] A construction method is sometimes used in which an architectural structure is raised and lowered using a jacking device and fixed in a predetermined position. When seismically isolating an existing building, a known construction method involves cutting the building and foundation apart, lifting the building with a jacking device at the installation height of the seismic isolation layer, fixing it in place, installing a seismic isolation device between the foundation and the building, and then filling the gap between the foundation and the building with grout. In this construction method, the weight of the building may increase due to an increase in the amount of items stored in the building after the seismic isolation device is installed, or the weight of the building may increase due to an extension to the building, which may increase the load acting on the jacking device after fixing it in place.

[0003] Furthermore, Patent Document 1 describes a floor structure in which the floor is supported by spring members and configured as a floating floor. In floor structures in which the floor of a live music hall or a stage can be raised and lowered, a jack device is used to fix the floor. In such floor structures, if the load on the floor increases due to people, stage equipment, stage props, etc. after the floor is fixed, the load acting on the jack device also increases.

[0004] Generally, the load capacity of a jacking device is considered to be the same whether it is jacked up or fixed in place. Therefore, if the load of the placed object increases after the jacking device is fixed in place, it is necessary to use a jacking device with a load capacity that can accommodate the increased load.

[0005] When the floor section in the above-described floor structure is fixed with a jack device, the floor section is supported by a spring member before fixation, so no load is applied to the jack device. Furthermore, since the floor section is supported by a spring member, the load capacity of the jack device when lifting the floor section is smaller than when no spring member is present, since the lifting load is simply the spring value multiplied by the lifting height. After the floor section is fixed in such a floor structure, the jack device is subjected to the increased load on the floor section. Therefore, when selecting a jack device, it is sufficient to ensure that the load capacity exceeds the load after fixation.

[0006] Large live concert halls with floors supported by spring members are sometimes used for various events other than live performances. For example, a stepped floor may be installed at the rear of the floor when a classical concert is held, or heavy objects may be placed locally on the floor for events such as motor shows. In such cases, there is no possibility of vibration problems because there is no vertical vibration during a live concert, so it is easier to use a floating floor that is fixed horizontally rather than spring-supported. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2019-178555 [Patent Document 2] Japanese Patent Application Publication No. 6-48685 Summary of the Invention [Problem to be solved by the invention]

[0008] In buildings with floating floors, the floors are secured with jacks to prevent sinking before steps or heavy objects are placed on them or before spectators enter. The jacks contact and secure the floating floor, so the jack reaction force is nearly zero when installed, and the increased live load on the floating floor after securing is borne by the jacks. The jacks are selected so that their load capacity exceeds the increased load on the floor after securing.

[0009] Therefore, it is reasonable that the jack device for fixing the floating floor is configured so that the load-bearing capacity after fixing is higher than the lifting capacity. For example, Patent Document 2 describes a jack device for raising and lowering a structure. The jack device described in Patent Document 2 does not have a configuration for fixing the placed object, and does not increase the load-bearing capacity after fixing compared to the load-bearing capacity during lifting.

[0010] An object of the present invention is to provide a jack device and a floor structure that can increase the load capacity after fixing compared to the load capacity during lifting. [Means for solving the problem]

[0011] In order to achieve the above-mentioned object, one aspect of the present invention is a jack device comprising: a first wedge member having a first inclined surface formed thereon; a second wedge member having a second inclined surface formed thereon; a lower support portion that movably supports the first wedge member and the second wedge member in a direction that moves them closer to or apart so that the first inclined surface and the second inclined surface face each other; a left-right screw that connects the first wedge member and the second wedge member and moves the first wedge member and the second wedge member along the axial direction based on rotation; and an upper support portion that is formed with a third inclined surface that contacts the first inclined surface and a fourth inclined surface that contacts the second inclined surface, and that moves up and down based on the movement of the first wedge member and the second wedge member.

[0012] In the present invention, the first wedge member and the second wedge member placed on the lower support portion are connected by left and right screws using the above-mentioned configuration, and the upper support portion is supported by the first wedge member and the second wedge member, thereby reducing the load generated horizontally by the first wedge member and the second wedge member and increasing the vertical load-bearing capacity of the jack device when fixed compared to the load applied by the left and right screws during lifting.

[0013] The present invention may also provide a jack device, wherein the lower support portion is formed with a first groove that allows the first wedge member and the second wedge member to move in the axial direction.

[0014] With the above configuration, the present invention enables the first wedge member and the second wedge member to move along the first groove on the lower support part based on the rotation of the left and right screws, thereby forming a jack that lifts the upper support part.

[0015] The present invention may also provide a jack device, wherein a second groove that allows the first wedge member to move in the axial direction is formed in the first inclined surface or the third inclined surface.

[0016] According to the above configuration, the present invention allows the first wedge member to move along the movement direction relative to the upper support portion.

[0017] The present invention may also provide a jack device, wherein a third groove that allows the second wedge member to move in the axial direction is formed in the second inclined surface or the fourth inclined surface.

[0018] According to the present invention, the above-described configuration allows the twelfth wedge member to move along the movement direction relative to the upper support portion.

[0019] The present invention may also be a jack device including a drive unit that rotates the right-and-left screw.

[0020] With the above configuration, the present invention can provide a jack structure in which the drive unit rotates the left-right screw in a predetermined rotational direction, thereby moving the first wedge member and the second wedge member in a direction toward or away from each other, and the upper support part moves in the vertical direction in accordance with the movement of the first wedge member and the second wedge member.

[0021] The present invention may also be a floor structure including a floor portion supported by the upper support portion and the above-described jack device.

[0022] With the above-described configuration, the present invention can realize a floor structure in which the floor section can be lifted to any desired height in the vertical direction by a jack device and can be fixed in place.

[0023] The present invention may also include one or more elastic members provided between the floor portion and the upper support portion, and a regulating portion that regulates upward movement of the floor portion relative to the upper support portion and compresses the elastic members to create a preload on the elastic members.

[0024] With the above-described configuration, the present invention can always prevent vertical displacement of the floor portion B and fix it in place, while preventing the generation of excessive reaction force during vertical earthquakes and the like. [Effects of the Invention]

[0025] According to the present invention, the load capacity after fixing can be increased compared to the load capacity during lifting. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a front view showing a configuration of a jack device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a right side view showing the configuration of the jack device. [Figure 3] FIG. 2 is a left side view showing the configuration of the jack device. [Figure 4] 10A and 10B are diagrams illustrating the operation of the jack device. [Figure 5] 6A and 6B are diagrams illustrating forces acting on a first wedge member and a second wedge member. [Figure 6] FIG. 10 is a right side view showing the configuration of a lower support part according to a modified example. [Figure 7] FIG. 10 is a front view showing the configuration of a floor structure according to a modified example. [Figure 8] FIG. 10 is a diagram showing the relationship between a load applied to a floor structure according to a modified example and the resulting displacement. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, an embodiment of a jack device and a floor structure according to the present invention will be described with reference to the drawings. In the following description, mutually perpendicular X-axis, Y-axis, and Z-axis are set. The Z-axis is a direction along the up-down direction. The X-axis direction will be referred to as the longitudinal direction, axial direction, etc., as appropriate, and the Y-axis direction will be referred to as the short direction, width direction, etc., as appropriate. In addition, the -X-axis direction will be referred to as one axial side, and the +X-axis direction will be referred to as the other axial side, etc.

[0028] As shown in Figures 1 to 3, the jack device 1 comprises a lower support part 2 provided on the installation object E, a pair of first wedge members 3 and second wedge members 4 provided on the lower support part 2, left and right screws 5 connecting the pair of first wedge members 3 and second wedge members 4, and an upper support part 6 provided on the pair of first wedge members 3 and second wedge members 4.

[0029] The lower support part 2 is formed into a rectangular plate-like body using, for example, steel material. The lower support part 2 is fixed on the installation target E with its longitudinal direction (axial direction) aligned along the X-axis direction. A first groove 2M is formed on the upper surface side of the lower support part 2 along the longitudinal direction. The first groove 2M is formed, for example, by being recessed downward from the upper surface side. A first wedge member 3 and a second wedge member 4 are placed in the first groove 2M. When viewed along the X-axis direction, the first groove 2M is formed in a shape that allows the bottom surfaces of the first wedge member 3 and the second wedge member 4 to engage with each other. The first groove 2M is formed so that the first wedge member 3 and the second wedge member 4 can move along the longitudinal direction, as will be described later.

[0030] The first wedge member 3 is disposed, for example, on one axial side of the lower support part 2. The first wedge member 3 is formed, for example, in the shape of a block using steel. The first wedge member 3 is formed with a width in the width direction (Y-axis direction) that allows it to engage with the first groove 2M. On the upper surface of the first wedge member 3, for example, a first inclined surface 3S is formed that inclines downward toward the other axial side. The inclination angle of the first inclined surface 3S is θ. A first through hole 3H that penetrates along the axial direction is formed inside the first wedge member 3.

[0031] The first through hole 3H has, for example, a right-handed female screw groove formed therein. As will be described later, one axial side of a bi-directional screw 5 is threaded into the first through hole 3H. Instead of providing a female screw groove in the first through hole 3H, a nut fixed to the first wedge member 3 concentrically with the first through hole 3H may be threadedly engaged with one axial side of the bi-directional screw 5 inserted into the first through hole 3H. In this case, the first through hole 3H may be a slit. A second wedge member 4 is arranged opposite the first wedge member 3.

[0032] The second wedge member 4 is disposed, for example, on the other axial side of the lower support part 2. The second wedge member 4 is formed, for example, in the shape of a block using steel. The second wedge member 4 is formed with a width in the width direction (Y-axis direction) that allows it to engage with the first groove 2M. A second inclined surface 4S that is inclined downward toward one axial side, for example, is formed on the upper surface of the second wedge member 4. The inclination angle of the second inclined surface 4S is θ. A second through-hole 4H that penetrates along the axial direction is formed inside the second wedge member 4.

[0033] The second through hole 4H has, for example, a left-handed female screw groove formed therein. As will be described later, the other axial side of the cross-head screw 5 is threaded into the second through hole 4H. Instead of providing the second through hole 4H with a female screw groove, a nut fixed to the second wedge member 4 concentrically with the second through hole 4H may be threadedly engaged with the other axial side of the cross-head screw 5 inserted into the second through hole 4H. In this case, the second through hole 4H may be a slit.

[0034] The screw 5 is formed in a rod shape using, for example, steel. The screw 5 is arranged with its axial direction aligned with the X-axis direction. A pair of tubular members 5C are inserted into the center of the screw 5 and are constrained from moving axially relative to the screw. The tubular members 5C may be formed integrally with the screw 5. A right-handed male thread portion 5A is formed on one axial side of the center of the screw 5. The male thread portion 5A is threaded into a first through-hole 3H provided in the first wedge member 3. A left-handed male thread portion 5B is formed on the other axial side of the center of the screw 5. The pitch of the male thread portion 5B is formed to be equal to the pitch of the male thread portion 5A. The male thread portion 5B is threaded into a second through-hole 4H provided in the second wedge member 4.

[0035] At the other axial end of the male thread portion 5B, for example, a drive unit 7 that rotates the cross-thread screw is provided. The drive unit 7 is fixed, for example, on the lower support portion 2. The drive unit 7 includes, for example, a motor and a reducer. The reducer reduces the rotation speed of the motor's output shaft and increases and outputs the rotational torque. The cross-thread screw 5 is driven to rotate by the drive unit 7, and the first wedge member 3 and the second wedge member 4 move along the axial direction based on the rotation of the cross-thread screw 5.

[0036] By changing the rotation output direction of the drive unit 7, the first wedge member 3 and the second wedge member 4, whose first inclined surface 3S and second inclined surface 4S face each other, move toward or away from each other on the lower support unit 2. A handle (not shown) for manual rotation and a bearing (not shown) for rotatably supporting the screw may be provided at one axial end of the male thread portion 5A. The first wedge member 3 and the second wedge member 4 support the upper support unit 6.

[0037] The upper support portion 6 is formed in a block shape using, for example, steel material. The upper support portion 6 is formed with a third inclined surface 6A that contacts the first inclined surface 3S and a fourth inclined surface 6B that contacts the second inclined surface 4S.

[0038] The third inclined surface 6A is formed from the center of the lower surface of the upper support part 6 to one axial side. The inclination angle of the third inclined surface 6A is θ. The third inclined surface 6A is formed so as to incline upward from the center of the lower surface of the upper support part 6 to one axial side. The third inclined surface 6A is formed to have approximately the same length as the male thread portion 5A of the left-right screw 5.

[0039] The fourth inclined surface 6B is formed from the center of the lower surface of the upper support part 6 toward the other axial direction. The inclination angle of the fourth inclined surface 6B is θ. The fourth inclined surface 6B is formed so as to incline upward from the center of the lower surface of the upper support part 6 toward the other axial direction. The fourth inclined surface 6B is formed to have approximately the same length as the male thread portion 5B of the left-right screw 5.

[0040] With the above configuration, the lower surface of the upper support portion 6 is formed to protrude downward when viewed in the Y-axis direction. A protrusion 6T protruding downward is formed in the center of the lower surface of the upper support portion 6. A slit hole 6H with an inverted U-shaped cross section is formed in the protrusion 6T along the axial direction. The width of the slit hole 6H is slightly larger than the outer diameter of the screw and smaller than the diameter of the tubular member 5C. The slit hole 6H may be an elongated hole extending in the vertical direction. The center of the screw 5 is inserted into the slit hole 6H. A pair of tubular members 5C is disposed on one axial side surface and the other axial side surface of the protrusion 6T, respectively. With the above configuration, the protrusion 6T rotatably supports the screw 5 at its center while its axial movement is restricted by the pair of tubular members 5C. As described below, the protrusion 6T is guided by the slit hole 6H and is movable up and down relative to the center of the screw 5. The protrusion 6T functions so that the first wedge member 3 and the second wedge member 4 are positioned symmetrically with respect to the center of the lower surface side of the upper support part 6 along the axial direction.

[0041] With the above configuration, when the horizontal screw 5 is rotated, the first wedge member 3 and the second wedge member 4 move axially on the first groove 2M of the lower support 2. Based on the movement of the first wedge member 3 and the second wedge member 4, the upper support 6 moves vertically as the protrusion 6T is restricted from axial movement by the pair of tubular members 5C and is guided vertically by the slit hole 6H provided in the protrusion 6T. The upper surface 6F of the upper support 6 is formed as a flat surface extending horizontally (X-axis direction). The floor B of the structure is supported on the upper surface 6F of the upper support 6. The floor B of the structure may be supported on the upper surface 6F of the upper support 6 via a steel material or the like. The floor B can move vertically in conjunction with the upper support 6. This forms a floor structure including the jack device 1 and the floor B. The floor B is supported, for example, by one or more jack devices 1. One or more driving units 7 of one or more jack devices 1 are controlled in cooperation with each other so that the floor B moves up and down horizontally.

[0042] For example, a second groove that allows the first wedge member 3 to move along the axial direction may be formed in the first inclined surface 3S. A guide portion that engages with the second groove may be formed in the third inclined surface 6A. The guide portion is guided by the second groove, prevents the upper support portion 6 from rotating around the Z axis when the first wedge member 3 moves, and allows the upper support portion 6 to move along the axial direction. Alternatively, the second groove may be formed on the third inclined surface 6A side, and the guide portion may be formed on the first inclined surface 3S side. That is, the second groove may be formed on either the first inclined surface 3S or the third inclined surface 6A.

[0043] For example, a third groove may be formed in the second inclined surface 4S, allowing the second wedge member 4 to move in the axial direction. A guide portion that engages with the third groove may be formed in the fourth inclined surface 6B. The guide portion is guided by the third groove, prevents the upper support portion 6 from rotating around the Z axis when the second wedge member 4 moves, and allows the upper support portion 6 to move in the axial direction. Alternatively, the third groove may be formed on the fourth inclined surface 6B side, and the guide portion may be formed on the second inclined surface 4S side. That is, the second groove may be formed on the second inclined surface 4S or the fourth inclined surface 6B.

[0044] As shown in FIG. 4, when the drive unit 7 is driven to rotate the screw 5 in a predetermined direction, the first wedge member 3 and the second wedge member 4 move toward each other along the axial direction (see FIG. 4(A)). The center of the screw 5 is rotatably supported by the protrusion 6T of the upper support unit 6. Therefore, the first wedge member 3 and the second wedge member 4 move by the same distance while maintaining symmetrical positions centered on the protrusion 6T. If the load applied to the upper surface 6F of the upper support unit 6 is not eccentric, the load acts evenly on the first wedge member 3 and the second wedge member 4. When the first wedge member 3 and the second wedge member 4 move toward each other, the protrusion 6T is restricted from moving in the axial direction by the pair of tubular members 5C and is guided upward by the slit hole 6H provided in the protrusion 6T, causing the upper support unit 6 to rise upward (see FIG. 4(B)). When the rotation of the screw 5 is stopped, the upper support part 6 is fixed at the height it was at after it rose. If the screw 5 is rotated in the direction opposite to the predetermined rotation direction after the upper support part 6 has risen, when the first wedge member 3 and the second wedge member 4 are separated, the upper support part 6 descends downward as the axial movement of the protrusion 6T is restricted by the pair of tubular members 5C and the protrusion 6T is guided downward by the slit hole 6H provided in the protrusion 6T.

[0045] 5, the inclination angle of the first inclined surface 3S and the second inclined surface 4S is θ, so when the first wedge member 3 or the second wedge member 4 moves horizontally x along the X-axis direction, the upper support part 6 moves x tan θ in the vertical direction. If the load acting on the first wedge member 3 or the second wedge member 4 via the upper support part 6 is W (the sum of the upper support part 6 and the live load), the force acting on the first wedge member 3 or the second wedge member 4 is expressed as follows, where μ is the coefficient of friction generated between the first wedge member 3 or the second wedge member 4 and the upper support part 6 and the lower support part 2, and F is the force acting on the first wedge member 3 or the second wedge member 4 from the left and right screw 5:

[0046] Vertical force acting on the wedge of the first wedge member 3 or the second wedge member 4: W / 2 Horizontal force generated by the tilt angle θ: (Wtanθ) / 2 Horizontal component of friction force between the first wedge member 3 or the second wedge member 4 and the upper support 6: μW / 2 Friction force between the first wedge member 3 or the second wedge member 4 and the lower support part 2: μW / 2 Horizontal force from the right and left screws 5 screwed into the first wedge member 3 and the second wedge member 4: F

[0047] From the above relationship, the force F1 acting on the left-right screw 5 when the first wedge member 3 and the second wedge member 4 are pulled together to raise the upper support part 6 is expressed by the following formula (1).

[0048]

number

[0049] Furthermore, the force F2 acting on the horizontal screw 5 when the first wedge member 3 and the second wedge member 4 are separated and the upper support part 6 is lowered is expressed by the following formula (2).

[0050]

number

[0051] If 2μ-tanθ<0, without the left and right screws 5, the first wedge member 3 and the second wedge member 4 would slide apart, making it impossible to support the load on the upper support part 6. Since the coefficient of friction between steel materials is μ≧0.2, if tanθ≦2μ≦0.4, the first wedge member 3 and the second wedge member 4 can be held in position regardless of the magnitude of the load W simply by the friction generated between the upper support part 6 and the lower support part 2, even without screws (this corresponds to θ≦21.8°).

[0052] The left-right screw 5 rotates due to a torque T in the rotational direction output from the drive unit 7. The axial force F generated in the male screw portion 5A threaded into the female screw portion of the first through hole 3H and the male screw portion 5B threaded into the female screw portion of the second through hole 4H is expressed by the following formula (3), assuming that the pitch p of the male screw portion 5A and the male screw portion 5B is 1.0 (friction loss is ignored), because the torque T, including the drive unit 7, is threaded into the female screw portions at two locations.

[0053]

number

[0054] Furthermore, the vertical load W1 (jack lifting capacity) that can be lifted when raising the upper support portion 6 is expressed by the following formula (4).

[0055]

number

[0056] Because the vertical load W2 that can be lifted when the jack is lowered is greater than W1, the jack strength is determined based on W1. For example, when μ = 0.2 and tan θ = 0.25, W1 = 3.08 F, and the jack lifting capacity is three times the axial force of the left and right screws 5. If the friction coefficient is reduced to μ = 0.1 and tan θ = 0.2, W1 = 5.0 F, which is five times the axial force of the left and right screws 5. A typical screw jack supports the load with the screw axial force. In comparison, with the jack device 1, it can be seen that when the same screw is used, a lifting capacity (load resistance) several times greater than that of a screw jack can be obtained.

[0057] The force F0 generated in the left and right screws 5 when an object is lifted and fixed by the jack device 1 is expressed by the following formula (5) based on the condition that the upper support part 6 does not descend.

[0058]

number

[0059] Since the coefficient of friction between typical steel materials is μ≧0.2, when the wedge slope tanθ≦0.4, F0=0. Because it is impractical to create such a steep slope using the first inclined surface 3S and the second inclined surface 4S, the first wedge member 3 and the second wedge member 4 do not typically move due to friction alone. If the top and bottom of the first wedge member 3 and the second wedge member 4 are treated with low-friction coating, the coefficient of friction μ=0.1, and the slope of the first inclined surface 3S and the second inclined surface 4S is tanθ=0.25, F0=0.025W. In this case, an axial force is generated in the horizontal screw 5, but this is only 1 / 40 of the load W. Therefore, the movement of the first wedge member 3 and the second wedge member 4 can be easily restricted by a mechanism that constrains the rotation of the horizontal screw 5, such as a brake on the electric motor provided in the drive unit 7.

[0060] Most of the vertical load acting on the jack device 1 is transmitted as a compressive force from the upper support 6 to the lower support 2 via the first wedge member 3 and the second wedge member 4. For example, if the width of the first wedge member 3 and the second wedge member 4 is 200 mm, the axial length is 100 mm, and they are made of SN400 steel, the long-term allowable compressive force is 640 tonf (6.3 MN). The jack device 1 can be a jack mechanism with extremely high strength after fixing, even if its lifting capacity is 20 tonf (200 kN), which is the same as that of a normal screw jack.

[0061] As described above, the jack device 1 can increase the load-bearing capacity after lifting and securing an object, regardless of the lifting capacity. The jack device 1 can adjust the height of the upper support part 6 by rotating the left and right screws 5 with an electric motor provided in the drive part 7, which can be remotely controlled from the outside, and can easily lift and secure an object. In the unlikely event that the drive part 7 breaks down, the jack device 1 also makes it possible to lift and secure the upper support part 6 by manually rotating the left and right screws 5.

[0062] According to the jack device 1, the drive unit 7 is fixed onto the lower support unit 2 and the horizontal screw 5 is connected, so the horizontal screw does not move but only rotates, and the upper support unit 6, which is installed so that its center of gravity is located at the center of the horizontal screw 5, can be raised and lowered in the vertical direction without causing horizontal displacement. According to the jack device 1, the first wedge member 3 and the second wedge member 4, which are threaded onto the horizontal screw 5, are always displaced symmetrically along the axial direction with respect to the center position of the upper support unit 6, and the vertical load acting on the first wedge member 3 and the second wedge member 4 can be evenly distributed.

[0063] The floating floor (floor section B) described above will sink slightly (about 20 mm) due to the load of spectators and other people. There is a structure on the outer periphery of the floating floor, which acts as a fixed floor that will not sink. The floating floor section is equipped with expansion joints to accommodate the step that occurs between it and the fixed floor when spectators enter. The smaller the step that occurs between the floating floor and the fixed floor, the better. It is desirable to align the floating floor level with the fixed floor level when there is no load, and to fix the floating floor so that it does not displace vertically when holding an event that does not cause vertical vibrations that would cause vibration problems.

[0064] The jack device 1 can be applied to such floating floors, and before an event without live load is held, the upper support part 6 is raised and brought into contact with the floating floor, and after the event is over, the live load is removed and the upper support part 6 is lowered away from the floating floor. With the jack device 1, almost no load is applied when the upper support part 6 is raised or lowered, so the motor specifications required for the left and right screws 5 and the drive part 7 can be made small and inexpensive. Furthermore, with the jack device 1, the load can be directly supported via the first wedge member 3 and second wedge member 4, which do not move due to friction when fixed.

[0065] According to the jack device 1, by connecting a reducer using a planetary gear or the like to the motor provided in the drive unit 7, the rotational torque of the motor can be increased and output, and an inexpensive motor can be used. Compared to a normal screw jack that supports a vertical load, the jack device 1 only needs to handle the load converted into a horizontal force via the first wedge member 3 and the second wedge member 4, and can lift and fix an object even if the screw bearing strength or motor capacity is small.

[0066] According to the jack device 1, by providing grooves in the upper support part 6 and the lower support part 2 on which the first wedge member 3 and the second wedge member 4 slide, it is possible to limit the displacement of the first wedge member 3 and the second wedge member 4 to one direction and prevent movement in an orthogonal direction or rotation (twisting) around the normal line (Z axis) of the sliding surface. The jack device 1 can be applied not only to newly constructed building facilities with vibration-isolating floating floors, but also to existing floating floor structures. The jack device 1 can be used to convert a floating floor into a fixed floor, and can also be appropriately changed from a fixed floor to a floating floor.

[0067] [Variation 1] The following describes modified examples of the jack device 1. In the following description, the same components as those in the above embodiment are designated by the same names and reference numerals, and overlapping descriptions will be omitted as appropriate.

[0068] As shown in FIG. 6 , the first groove 2M of the lower support 2 may be formed so that its width increases downward as viewed along the axial direction (X-axis direction). The bottoms of the first wedge member 3 and the second wedge member 4 may be engaged with the first groove 2M and slidable along the axial direction. This configuration prevents the first wedge member 3 and the second wedge member 4 from coming off the lower support 2. That is, the jack device 1 prevents the first wedge member 3 and the second wedge member 4 from coming off the lower support 2 even when a tensile force is applied to the upper support 6, making it applicable even when a tensile load is applied. Furthermore, the bottoms of the first wedge member 3 and the second wedge member 4 that engage with the first groove 2M do not necessarily have to be engaged over the entire axial length, but may be provided only over a portion of the length.

[0069] [Variation 2] As shown in FIG. 7, a floor structure P having an excessive reaction force prevention mechanism may be configured on the upper portion of the jack device 1. The excessive reaction force prevention mechanism includes, for example, one or more elastic members D provided between the floor portion B and the upper support portion 6, and a restricting portion 8 that restricts upward movement of the floor portion B relative to the upper support portion 6. The restricting portion 8 includes, for example, a side wall portion 8A provided on the upper surface 6F of the upper support portion 6, and an upper flange portion 8B provided at the upper end of the side wall portion 8A. The side wall portion 8A is formed, for example, extending around the periphery of the upper surface 6F of the upper support portion 6. The side wall portion 8A is formed in the shape of a wall that rises upward from the upper surface 6F of the upper support portion 6. An upper flange portion 8B is formed at the upper portion of the side wall portion 8A and protrudes horizontally from the inner periphery of the side wall portion 8A.

[0070] The upper flange portion 8B abuts against a lower flange portion B2 provided on a floor support portion B1 formed on the floor portion B. The floor support portion B1 is formed, for example, with a diameter smaller than the inner diameter of the upper flange portion 8B. A lower flange portion B2 protruding in the radial direction is formed on the lower end side of the floor support portion B1. The lower flange portion B2 is formed to extend along the periphery of the lower end side of the floor support portion B1. The lower flange portion B2 abuts against the upper flange portion 8B. One or more elastic members D are provided between the lower surface side of the floor support portion B1 and the upper surface of the upper support portion 6.

[0071] The elastic member D is, for example, a coil spring that elastically deforms in an expandable and contractable manner in the vertical direction. Other elastic members, such as a leaf spring, a rod spring, or a gas spring, may be used as long as they are elastically deformable in an expandable and contractable manner. The elastic member D is disposed in a compressed state between the lower surface of the floor support portion B1 and the upper surface of the upper support portion 6. The elastic member D biases the floor support portion B1 upward relative to the upper support portion 6. The floor support portion B1 is restricted from moving upward relative to the upper support portion 6 by the lower flange portion B2 abutting against the upper flange portion 8B. The floor support portion B1 and the restricting portion 8 compress the elastic member D, generating a preload. As shown in FIG. 8, when a downward load is applied to the floor support portion B1, downward displacement of the floor support portion B1 does not occur until the load value of the preload is reached.

[0072] In the floor structure P provided with the excessive reaction force prevention mechanism according to the second modification, the jack device 1 applies the rated load of the jack device 1 upward to the floor B as a preload. Therefore, when the vertical load applied to the floor B is equal to or less than the preload, the vertical spring stiffness becomes infinity (rigid), and the floor B does not displace downward and remains a fixed floor. When the vertical load applied to the floor B due to a vertical earthquake or an impact force exceeds the preload, the floor B is supported by the vertical spring stiffness k of the elastic member D, which acts as a buffer, and displaces downward, absorbing energy and suppressing an increase in reaction force. In this way, the floor structure P can normally prevent vertical displacement of the floor B and fix it, while preventing the generation of excessive reaction force during a vertical earthquake or the like.

[0073] Although one embodiment of 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, the first inclined surface 3S and the second inclined surface 4S may be provided on the lower surfaces of the first wedge member 3 and the second wedge member 4, and the third inclined surface 6A and the fourth inclined surface 6B may be provided on the lower support part 2. [Explanation of symbols]

[0074] 1 jack device, 2 lower support part, 2M first groove, 3 first wedge member, 3S first inclined surface, 4 second wedge member, 4S second inclined surface, 5 left and right screws, 6 upper support part, 6A third inclined surface, 6B fourth inclined surface, 7 drive part, 8 regulating part, B floor part, D elastic member, P floor structure

Claims

1. a first wedge member having a first inclined surface; a second wedge member having a second inclined surface formed thereon; a lower support portion on which the first wedge member and the second wedge member are mounted so as to be movable in a direction in which the first inclined surface and the second inclined surface face each other; a right-and-left screw that connects the first wedge member and the second wedge member and moves the first wedge member and the second wedge member along an axial direction based on rotation; an upper support portion having a third inclined surface in contact with the first inclined surface and a fourth inclined surface in contact with the second inclined surface, the upper support portion being movable in a vertical direction based on movement of the first wedge member and the second wedge member; A jack device characterized in that, when the inclination angle of the first inclined surface and the second inclined surface is θ and the coefficient of friction generated between the first wedge member or the second wedge member and the upper support portion or the lower support portion is μ, tanθ≦2μ.

2. The lower support portion has a first groove formed therein that allows the first wedge member and the second wedge member to move along the axial direction. The jack apparatus according to claim 1 .

3. a second groove that allows the first wedge member to move in the axial direction is formed in the first inclined surface or the third inclined surface; The jack device according to claim 1 or 2.

4. a third groove that allows the second wedge member to move in the axial direction is formed in the second inclined surface or the fourth inclined surface; The jack device according to any one of claims 1 to 3.

5. A drive unit that rotates the left and right screws is provided. A jack device according to any one of claims 1 to 4.

6. A floor structure comprising: a floor supported by the upper support; and the jack device according to any one of claims 1 to 5.

7. one or more elastic members disposed between the floor portion and the upper support portion; a restricting portion that restricts upward movement of the floor portion relative to the upper support portion and compresses the elastic member to generate a preload on the elastic member, The floor structure according to claim 6.

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