Support structure

Abstract

To provide a support structure which can stably support an upper structure while suppressing damage caused by relative displacement generated in a lower structure and the upper structure by a shake, or the like.SOLUTION: A support structure 10 includes a unit 20 arranged above a foundation part B1 and below an upper structure. The unit 20 includes an upper member 21, a lower member 22, and a tensile member 30. The upper member 21 includes an upper joint part 21a rigidly joined to the upper structure, and a first connection part 21b extending to the side part from the upper joint part 21a. The lower member 22 includes a lower joint part 22a rigidly joined to the foundation part B1, and a second connection part 22b which extends to the side part from the lower joint part 22a and is arranged above the first connection part 21b. The tensile member 30 has an assembly which is connected to the first connection part 21b and the second connection part 22b and is made of a plurality of rod-like members 35.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a support structure that is disposed between a lower structure and an upper structure and supports the upper structure.

Background Art

[0002] Conventionally, structures such as buildings have been supported directly on a foundation portion disposed below via compression members such as a direct foundation or a pile foundation. In this case, if a large relative displacement occurs between the structure and the foundation portion due to an earthquake or the like, the structure and the foundation portion may be severely damaged. Therefore, a seismic isolation device may be used (see, for example, Patent Document 1). The seismic isolation device described in this document is formed such that an upper support and a lower support are swingable via a suspension portion with upper and lower locking portions as fulcrums, and the upper and lower locking portions each have a spherical seat formed such that a contact portion with a horizontal portion or a lower frame is spherical.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when using a spherical seat for swingable support, the surfaces of the concave portion of the spherical seat and the convex portion that contacts it come into contact with each other for a long time. In this case, since there is a concern that the concave portion and the convex portion may adhere to each other, maintenance such as constantly applying a lubricant such as grease to the contact surface is required.

Means for Solving the Problems

[0005] The support structure for solving the above problems is a support structure that is disposed between a lower structure and an upper structure and supports the upper structure, and includes an upper member having an upper joint rigidly joined to the upper structure and a first connecting portion extending laterally from the upper joint, a lower member having a lower joint rigidly joined to the lower structure and a second connecting portion extending laterally from the lower joint and disposed above the first connecting portion, and a tension member connected to the first connecting portion and the second connecting portion and having an assembly composed of a plurality of rod-shaped members. The rod-shaped member is arranged at an interval from an adjacent rod-shaped member, and has a sliding portion having a bundle of abutting members provided in a predetermined region between the first connecting portion and the second connecting portion, which is fixed and arranged between the adjacent rod-shaped members. In the sliding portion, due to the displacement generated between the lower structure and the upper structure, friction is generated between the abutting rod-shaped members, thereby generating a damping force for damping the sway of the upper structure.

Advantages of the Invention

[0006] According to the present invention, it is possible to increase the allowable amount of deformation caused by relative displacement generated in the upper structure with respect to the lower structure due to shaking or the like, and stably support the upper structure while suppressing damage.

Brief Description of the Drawings

[0007]

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Mode for Carrying Out the Invention

[0008] Hereinafter, an embodiment in which the support structure is embodied will be described with reference to FIGS. 1 to 5. The support structure of this embodiment is used for a support structure that supports an upper structure. This support structure is disposed between the upper structure and the lower structure and is fixed to the upper structure and the lower structure. Examples of the upper structure include buildings such as buildings and footings. Examples of the lower structure include foundation beams, foundation slabs, and footings, but here it will be described as a foundation part.

[0009] FIG. 1 is a view seen from a horizontal diagonal direction with respect to the front of the support structure 10, and FIG. 2 is a perspective view of the support structure 10. Further, FIG. 3 is a top view of the support structure 10 seen from the upper structure S1 side (from above), excluding the upper structure S1. FIG. 4 is a side view of the main part of the support structure 10, and FIG. 5 is a side view of the main part of the support structure 10 in a state where relative displacement has occurred in the upper structure S1.

[0010] As shown in FIG. 1, the support structure 10 includes a plurality of units 20. In this case, for example, the plurality of units 20 are arranged in a planar lattice or diagonally aligned manner. The unit 20 is disposed between the upper structure S1 and the foundation part B1. The unit 20 includes an upper member 21 rigidly joined to the upper structure S1, a lower member 22 rigidly joined to the foundation part B1, and a tension member 30. The tension member 30 is rotatably connected to the upper member 21 and the lower member 22.

[0011] The upper member 21 includes two upper joint portions 21a and a first connecting portion 21b. The two upper joint portions 21a are arranged in the same vertical plane (at rest) such that they approach each other at the lower end side and separate from each other at the upper end side. Each upper joint portion 21a is constituted by, for example, a cylindrical member. The upper surface of each upper joint portion 21a is rigidly joined to the lower surface of the upper structure S1, and the lower surface of each upper joint portion 21a is rigidly joined to the upper surface of the first connecting portion 21b. The first connecting portion 21b has a rectangular parallelepiped shape with a substantially square plane. Further, on the upper surface of the first connecting portion 21b, the upper joint portion 21a is fixed so that the first connecting portion 21b extends laterally from the upper joint portion 21a.

[0012] The lower member 22 includes two lower joint portions 22a and a second connecting portion 22b. The two lower joint portions 22a are arranged in the same vertical plane (at rest) such that they approach each other at the upper end side and separate from each other at the lower end side. Each lower joint portion 22a is constituted by, for example, a cylindrical member. The lower surface and the upper surface of each lower joint portion 22a are respectively rigidly joined to the upper surface of the base portion B1 and the lower surface of the second connecting portion 22b. In the present embodiment, for example, the interval between the lower joint portions 22a at the location rigidly joined to the base portion B1 is the same as the interval between the upper joint portions 21a rigidly joined to the upper structure S1. Also, the upper joint portion 21a and the lower joint portions 22a adjacent thereto are arranged so as to have the same interval. The second connecting portion 22b has the same shape as the first connecting portion 21b and is arranged above the first connecting portion 21b. On the lower surface of the second connecting portion 22b, the lower joint portion 22a is fixed so that the second connecting portion 22b extends laterally from the lower joint portion 22a.

[0013] (Tensile member 30) Next, the configuration of the tensile member 30 will be described in detail with reference to FIGS. 3 and 4. The tension member 30 of this embodiment includes two fixing members 31, a retaining member 32, a plurality of rod-shaped members 35, and an adjustment nut 36. The plurality of rod-shaped members 35 are connected to the upper member 21 and the lower member 22 by pin joints. Specifically, the fixing member 31 is fitted into the through holes provided in the first connecting portion 21b and the second connecting portion 22b. A plurality of rod-shaped members 35 penetrate each fixing member 31. In this embodiment, a total of 25 rod-shaped members 35 arranged in a 5×5 array in the horizontal direction are arranged. These 25 rod-shaped members 35 are arranged in the arrangement region A1. This arrangement region A1 is a region where the rod-shaped members 35 are arranged with a gap therebetween around the central axis of a member having a cross-sectional area (total cross-sectional area of the 25 rod-shaped members 35) for supporting the upper structure S1 when a single member is arranged. The plurality of rod-shaped members 35 of this embodiment support the upper structure S1 as an aggregate densely arranged with equal intervals in this arrangement region A1.

[0014] On the outer periphery of the fixing member 31, the retaining member 32 is fitted outside the opposing surfaces of the first connecting portion 21b and the second connecting portion 22b. The retaining member 32 has a rectangular frame shape sized to surround the edges of the through holes of the first connecting portion 21b and the second connecting portion 22b. Further, in the fixing member 31, adjustment nuts 36 are fixed at positions corresponding to each of the rod-shaped members 35 passing therethrough.

[0015] Thread grooves are formed on the outer peripheries of both ends of the rod-shaped member 35. And at each end of the rod-shaped member 35, a corresponding adjustment nut 36 is screwed thereon one by one. By loosening or tightening each adjustment nut 36, the suspension length of the rod-shaped member 35 is adjusted. Here, the suspension length of the rod-shaped member 35 is the length from the upper surface of the first connecting portion 21b to the lower surface of the second connecting portion 22b.

[0016] (Method of assembling the support structure) When assembling the support structure 10 described above, for example, first, the upper member 21 is assembled by fixing the upper joint portion 21a to the first connecting portion 21b. Then, the assembled plurality of upper members 21 are fixed to the upper structure S1.

[0017] Next, the second connecting portion 22b is disposed above the first connecting portion 21b of the upper member 21. Then, the lower member 22 is assembled by fixing the lower joint portion 22a to the second connecting portion 22b.

[0018] On the other hand, both ends of a plurality of rod-shaped members 35 are passed through the fixing member 31, and are fixed to the first connecting portion 21b and the second connecting portion 22b by using the retaining member 32. Next, the lower joint portion 22a of the lower member 22 is fixed to the base portion B1. Then, by lifting the upper structure S1, the length of each rod-shaped member 35 is adjusted using the adjusting nut 36 according to the distance between the first connecting portion 21b and the second connecting portion 22b. Note that the assembling method of the support structure 10 is not limited to the method described above.

[0019] (Operation of the support structure) Next, with reference to FIG. 5, the operation of the support structure 10 described above will be described. As shown in FIG. 5, when a force acts on the upper structure S1, the upper member 21 of the unit 20 moves according to the movement of the upper structure S1. In FIG. 5, the upper structure S1 is shown in a state of having moved by a distance D1 with respect to the base portion B1. Then, according to the movement of the upper member 21, the rod-shaped member 35 joined to the upper member 21 is displaced and swings with respect to the second connecting portion 22b of the lower member 22.

[0020] (Bending rigidity and allowable displacement when composed of one member or n members) Next, the bending rigidity and allowable displacement when the tension member 30 is composed of one member or n members will be described. The allowable displacement is the displacement when the allowable stress σ a is reached. Here, the cross-sectional area of one member is made the same as the total cross-sectional area composed of n members. And, W is the assumed load in the support structure 10, E is the Young's modulus, and l is the suspension length.

[0021] [Table 1] As shown in Table 1, the displacement (allowable displacement) when the allowable stress σ a is reached becomes √n times larger when composed of n members than when composed of one member.

[0022] Furthermore, the trial calculation results of the tension member 30 using specific numerical values will be described using Table 2. Here, whether the tension member 30 is composed of one member or 25 rod-shaped members 35, the following values are the same. The support weight W is 1000 kN, and the target natural period T is 5 seconds. Furthermore, the suspension length L is 6210 mm, the Young's modulus E is 200 kN / mm 2 , the yield stress σ y is 1080 N / mm 2 , the allowable stress σ a is 720 N / mm 2 , the safety factor γ is 1.5, and the required cross-sectional area A is 1389 mm 2 . And the different values between the case where the tension member 30 is composed of one member and the case where it is composed of 25 rod-shaped members 35 are shown in Table 2.

[0023]

Table 2

[0024] (Action) The unit 20 that constitutes the support structure 10 includes an upper member 21, a lower member 22, and a tension member 30. The upper member 21 is rigidly joined to the upper structure S1, and the lower member 22 is rigidly joined to the foundation B1. The tension member 30 connects the first connecting portion 21b of the upper member 21 and the second connecting portion 22b of the lower member 22, and is composed of an aggregate (bundle) of a plurality of rod-shaped members 35. Therefore, the allowable displacement amount can be increased.

[0025] According to this embodiment, the following effects can be obtained. (1) In the support structure 10 of this embodiment, the tension member 30 that connects the first connecting portion 21b of the upper member 21 and the second connecting portion 22b of the lower member 22 is composed of an aggregate of a plurality of rod-shaped members 35. Thereby, since the allowable displacement amount can be increased, even when the displacement of the upper structure S1 relative to the foundation B1 is large, damage to the support structure 10 can be suppressed. Also, since the upper structure S1 is supported by the total cross-sectional area obtained by summing the cross-sectional areas of the rod-shaped members 35 by the number, the diameter of the rod-shaped members 35 to be used can be changed by changing the number. Therefore, even if the cross-sectional area required to support the upper structure S1 is large, the support structure 10 can be configured using rod-shaped members 35 with a general diameter.

[0026] (2) Each rod-shaped member 35 of this embodiment is attached so that its length can be adjusted by an adjustment nut 36. Thereby, the length of the rod-shaped member 35 can be adjusted according to the arrangement of the upper member 21 and the lower member 22. And by changing the length of the rod-shaped member 35, a support structure corresponding to the natural period of the upper structure S1 or the foundation B1 can be realized, so that the seismic isolation effect can be efficiently realized.

[0027] This embodiment can be implemented with the following modifications. This embodiment and the following modification examples can be implemented in combination with each other within a range that is not technically contradictory. · The tension member 30 of the above-described embodiment is configured using 25 rod-shaped members 35. Here, when the tension member of the support structure swings, a sliding portion that slides between adjacent rod-shaped members may be provided. In this case, as the rod-shaped members slide, a damping force due to frictional force acts.

[0028] For example, as shown in FIG. 6, a sliding portion 37 is provided in the region between the fixing members 31 of the tension member 30. This sliding portion 37 is constituted by a bundle of contact members 38 fixed to the rod-shaped members 35.

[0029] As shown in FIG. 6(a), before relative displacement occurs, the contact members 38 are arranged in contact with each other without a gap. Then, as shown in FIG. 6(b), when relative displacement occurs, the displacement of the contacting contact members 38 is suppressed by friction.

[0030] Also, as shown in FIG. 7, a damping member 40 may be provided on a plurality of rod-shaped members 45. This damping member 40 includes a case 41 through which a plurality of rod-shaped members 45 pass. As shown in FIG. 8, a viscous material 42 such as grease or oil is enclosed in the case 41 as an enclosure member. Further, seal members 43 are provided above and below the case 41 so that the viscous material 42 does not leak out when the rod-shaped members 45 slide. And the damping member 40 is fixed to the central rod-shaped member 45 by a fixing portion 44. Furthermore, a plurality of vanes 46 as resistance members are provided on each rod-shaped member 45 inside the case 41.

[0031] Then, as shown in FIG. 9, when relative displacement occurs in the upper structure S1, among the rod-shaped members 45 other than the central rod-shaped member 45 fixed by the fixing portion 44, the rod-shaped members 45 shift inside the case 41. In this case, the displacement of the vanes 46 of the rod-shaped members 45 is suppressed by the viscous resistance of the viscous material 42 inside the case 41.

[0032] · The unit 20 of the above embodiment includes one upper member 21, one lower member 22, and one tension member 30 each. The configuration of the unit 20 is not limited to this, and it may be applied to a structure provided with one upper member and one lower member to which a plurality of tension members are connected.

[0033] FIG. 10 is a plan view of the support structure 60, and FIG. 11 is a side view seen from the cross-sectional direction of the line "11"-"11" in FIG. 10. As shown in FIG. 10, the upper structure S2 is a plate member, and a substantially circular hole S2h is formed in the center. Further, the base portion B2 is a cylindrical member disposed on the central axis A2 of the hole S2h. And a support structure 60 is disposed between the upper structure S2 and the base portion B2.

[0034] As shown in FIG. 11, the support structure 60 includes one upper member 61, one lower member 62, and a plurality of tension members 64. The upper member 61 includes an upper joint portion 61a and a first connection portion 61b. The upper joint portion 61a protrudes downward so as to surround the outer peripheral edge of the hole S2h of the upper structure S2. The first connection portion 61b extends in the radial inner direction (side direction) of the hole S2h from the upper joint portion 61a. Further, a hole 61bh is formed at the center of the first connection portion 61b.

[0035] The lower member 62 has a stepped cylindrical shape and has a small-diameter lower joint portion 62a integrated with the base portion B2 and a second connection portion 62b extending in the radial outer direction (side direction) from the lower joint portion 62a.

[0036] As shown in FIG. 10, the three tension members 64 are arranged at intervals of, for example, 120 degrees. Each of the three tension members 64 is composed of a plurality of rod-shaped members 65 arranged in a fan-shaped planar manner. And each rod-shaped member 65 is pin-jointed to the upper surface of the first connection portion 61b of the upper member 61 and the lower surface of the second connection portion 62b of the lower member 62.

[0037] · In the above-described embodiment, the upper member 21 includes two upper joint portions 21a rigidly joined to the upper structure S1, and the lower member 22 includes two lower joint portions 22a rigidly joined to the base portion B1. The number of the upper joint portions and the lower joint portions is not limited to two. For example, a support structure having one upper joint portion and one lower joint portion respectively may be used.

[0038] Also, as shown in FIG. 12, a support structure including a unit 70 having three upper joint portions 71a and three lower joint portions 72a may be used. Further, as shown in FIG. 13, a support structure including a unit 80 having four upper joint portions 81a and four lower joint portions 82a may be used. In these cases, the upper joint portions 71a, 81a of the upper members 71, 81 and the lower joint portions 72a, 82a of the lower members 72, 82 are arranged at the same intervals, and the upper joint portions 71a, 81a and the lower joint portions 72a, 82a are arranged alternately. The upper joint portions 71a, 81a are rigidly joined to the upper surfaces of the first connecting portions 71b, 81b, and the lower joint portions 72a, 82a are rigidly joined to the lower surfaces of the second connecting portions 72b, 82b. The units 70, 80 each include a tension member including a plurality of rod-shaped members 75, 85. The plurality of rod-shaped members 75, 85 are pin-joined to the upper surfaces of the centers of the first connecting portions 71b, 81b (positions surrounded by the upper joint portions 71a, 81a) and the lower surfaces of the centers of the second connecting portions 72b, 82b (positions surrounded by the lower joint portions 72a, 82a).

[0039] Furthermore, the number of the upper joint portions of the upper member and the number of the lower joint portions of the lower member do not necessarily have to be the same. In this case, the plurality of upper joint portions of the upper member and the lower joint portions of the lower member are arranged so as not to interfere with each other. Specifically, the plurality of upper joint portions of the upper member are arranged at equal intervals, and the lower joint portions of the lower member are arranged at equal intervals, and the number of one of the upper joint portions and the lower joint portions may be a multiple of the number of the other. For example, a unit including an upper member having two upper joint portions and a lower member having four lower joint portions may be used.

[0040] · In the above-described embodiment, the rod-shaped member 35 is used as a plurality of constituent members included in the tension member 30. The shape of the rod-shaped members of the aggregate constituting the tension member 30 is not limited, and for example, it may be linear and flexible. However, it is necessary that the member can support the upper structure S1 as an aggregate without buckling when relative displacement occurs. Further, the number and arrangement of the rod-shaped members are not limited to the number and arrangement described above, and any number and arrangement may be used as long as the total cross-sectional area of the plurality of constituent members constituting the tension member is equal to or greater than the cross-sectional area required to support the upper structure. Furthermore, the fixing member 31 for fixing the plurality of rod-shaped members 35 is formed in a rectangular parallelepiped shape, and the retaining member 32 is formed in a square frame shape. The shape of the fixing member may be any shape that fits the shape of the holes formed in the first connecting portion and the second connecting portion. For example, cylindrical holes may be formed in the first connecting portion and the second connecting portion, and the fixing member may be configured in a cylindrical shape so as to fit thereinto. Further, the retaining member 32 may be any shape that fits the fixing member and prevents the fixing member from coming out of the holes in the first connecting portion and the second connecting portion.

Explanation of Reference Numerals

[0041] A1... Arrangement region, A2... Central axis, B1, B2... Base portions, D1... Distance, S1, S2... Upper structures, S2h, 61bh... Holes, 10, 60... Support structures, 20, 70, 80... Units, 21, 61, 71, 81... Upper members, 21a, 61a, 71a, 81a... Upper joint portions, 21b, 61b, 71b, 81b... First connecting portions, 21h, 22h... Through holes, 22, 62, 72, 82... Lower members, 22a, 62a, 72a, 82a... Lower joint portions, 22b, 62b, 72b, 82b... Second connecting portions, 30, 64... Tension members, 31... Fixing members, 32... Retaining members, 35, 45, 65, 75, 85... Rod-shaped members, 36... Adjusting nuts, 37... Sliding portions, 38... Contact members, 40... Damping members, 41... Case as an encapsulating member, 42... Viscous material, 43... Sealing member, 44... Fixing portion, 46... Blades as resistance members.

Claims

【Claim 1】 A support structure disposed between a lower structure and an upper structure for supporting the upper structure, comprising an upper member having an upper joint rigidly joined to the upper structure and a first connecting portion extending laterally from the upper joint, a lower member having a lower joint rigidly joined to the lower structure and a second connecting portion extending laterally from the lower joint and disposed above the first connecting portion, and a tension member having an assembly composed of a plurality of rod-like members connected to the first connecting portion and the second connecting portion, wherein the rod-like members are arranged at intervals from adjacent rod-like members, further comprising a sliding portion having a bundle of abutting members disposed between the adjacent rod-like members, fixed to the rod-like members, and provided in a predetermined region between the first connecting portion and the second connecting portion, and in the sliding portion, a displacement occurring between the lower structure and the upper structure causes friction to occur between the abutting rod-like members, thereby generating a damping force for damping the sway of the upper structure.

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