JP2009299281A - Horizontal bearing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a horizontal bearing apparatus further simplifying a mounting structure to an upper structure without enlarging the apparatus. <P>SOLUTION: The horizontal bearing apparatus includes a laminated rubber body 2 shear-deformed in a horizontal direction to support the horizontal load of the upper structure 1 without supporting the vertical load of the upper structure 1. The laminated rubber body 2 is formed by laminating intermediate steel plates 23 and rubber layers 24 alternately between an upper steel plate 21 and a lower steel plate 22 and integrally forming them. The upper face of the upper steel plate 21 is protrusively provided with a key plate 12 with its upper part longer in horizontal length than its lower part and with a step part formed between the upper part and the lower part. An upper shoe 13 fixed to the lower face of the upper structure 1 and formed with an engaging part engaged with the step part of the key plate 12 is constituted to be engaged with the step part of the key plate 12 in a state of having an expansion gap between the upper steel plate 21 and the key plate 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a horizontal support device for supporting a load in a horizontal direction, among so-called function-separated type support devices that support structures such as bridges, overpasses, building structures, and machines.

  Conventionally, a support device has been arranged between an upper structure such as a bridge and a lower structure such as a pier, and the force acting from the upper structure is transmitted to the lower structure, so that the load due to the loading of the upper structure is deflected. Absorbing twist deformation.

  The load transmission function includes a vertical force support function and a horizontal force support function. Many conventional bridge support devices have integrated functions that integrate both functions. The function-integrated bearings have the advantage that the fulcrum structure is simple in order to consolidate the functions, but the bearing part becomes larger due to the balance of each function, and the bearing part is locally damaged or partially malfunctions. When this occurs, there is a concern that not only one function but also the other function greatly affects the other function.

  For these reasons, recently, the vertical bearing device that supports the vertical load of the upper structure and the elastic body is sheared and deformed in the horizontal direction without supporting the vertical load of the upper structure. A function-separated type support device including a horizontal support device that supports a horizontal load has been proposed (see, for example, Patent Document 1).

  FIG. 11 is a front view showing a conventional horizontal bearing device as described in Patent Document 1. As shown in FIG. As shown in the figure, the horizontal bearing device 100 includes an elastic body 132 fixed to the upper surface of the lower structure 130 and a side block 133 fixed to the lower surface of the upper structure.

  The elastic body 132 has a square flange plate 131 (upper steel plate) that forms a gap C1 between the elastic body 132 and the upper structure. The elastic body 132 is formed by alternately laminating steel plates and rubber layers between the flange plate 131 and a lower steel plate (not shown) and simultaneously molding them by vulcanization adhesion.

  On the other hand, the side block 133 can be engaged with the circumferential surface along the bridge axis direction and the bridge axis perpendicular direction of the flange plate 131, and a gap C2 is formed on the lower surface of the flange plate 131 by the engagement piece 134 provided at the lower part. Is engaged through.

  In such a horizontal support device 100, even if the elastic body 132 is shear-deformed to support a horizontal load and the upper structure rotates, the rotation is allowed by the gaps C1 and C2. For the upward lifting force, the engaging piece 134 engages with the flange plate 131, thereby transmitting the upward lifting force between the upper and lower structures via the elastic body 132, thereby preventing the upper structure from falling. .

  However, the elastic body 132 has a large flange plate 131 that protrudes from the main body of the elastic body, and a side block 133 is attached to the lower surface of the upper collar 135 so as to hold the flange plate 131. Therefore, the horizontal bearing device 100 has a problem that the mounting area of the superstructure is increased and the size of the device is increased.

In response to such a problem, the present applicant has previously developed a horizontal bearing device as described in Patent Document 2 as a horizontal bearing device that is compact in size. In this horizontal bearing device, an inverted L-shaped block protrudes upward from an upper steel plate of a laminated rubber body, and an upper collar is engaged with the inverted L-shaped block. Thereby, what protrudes outside from the laminated rubber body which has an upper steel plate is eliminated, and the apparatus itself is made compact.
However, this horizontal bearing device has a problem that at least a pair of inverted L-shaped blocks must be provided so as to increase the number of parts and the mounting method with the upper collar becomes complicated.

Japanese Patent No. 3634288 JP 2008-25180 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a horizontal bearing device in which the structure for mounting to an upper structure is simplified without increasing the size of the device.

As a result of intensive studies to solve the above problems, the present inventor has found a solution means having the following configuration, and has completed the present invention.
(1) A horizontal bearing device including a laminated rubber body that supports a horizontal load of the upper structure by being deformed in a horizontal direction without supporting a vertical load of the upper structure. Is formed by alternately laminating intermediate steel plates and rubber layers between the upper steel plate and the lower steel plate, and the upper surface of the upper steel plate has a larger horizontal length than the lower portion on the upper surface, In addition, a key plate having a step portion is formed between the upper portion and the lower portion, and an engagement portion is formed that is fixed to the lower surface of the upper structure and engages the step portion of the key plate. A horizontal bearing device, wherein the upper collar is engaged with a step portion of the key plate with a gap between the upper steel plate and the key plate.
(2) The upper collar has a through-hole through which the upper part of the key plate penetrates at the center, and has a frame shape having an engaging part that engages with a step part of the key plate on the inner peripheral surface of the through-hole. The horizontal bearing device according to (1) above.
(3) The horizontal bearing device according to (2), wherein there is a gap between the lower surface of the upper structure exposed from the through hole of the upper collar and the upper upper surface of the key plate.
(4) The (1) to (3), wherein an elastic layer is filled in the gap on the outer peripheral side from the upper collar so as to close the gap between the upper steel plate and the upper structure formed by the key plate. ) Horizontal bearing device according to any of the above.

  The horizontal bearing device of the present invention projects a key plate on the upper surface of the upper steel plate, the upper plate having a horizontal length longer than the lower portion and having a step formed between the upper portion and the lower portion. The key plate is engaged with the stepped portion with a gap between the upper steel plate and the key plate. Thereby, since a plane size can be made small, the effect that an apparatus can be made compact is acquired. Moreover, since the number of parts can be reduced, the cost can be reduced and the mounting structure to the upper structure can be simplified, so that the workability can be improved.

  Hereinafter, an embodiment of a horizontal bearing device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially broken front view showing the horizontal bearing device of the present embodiment. FIG. 2 is a partial enlarged cross-sectional view showing the vicinity of the key plate and the upper eyelid of the horizontal bearing device shown in FIG. FIG. 3 is a plan view showing a key plate and an upper collar of the horizontal bearing device shown in FIG. 4 is a schematic explanatory view showing a horizontal force transmission action in the horizontal support device shown in FIG. 1, FIG. 5 is a schematic explanatory view showing the upper lift transmission action, and FIG. 6 is a rotational displacement following action thereof. It is a schematic explanatory drawing which shows.

  As shown in FIG. 1, the horizontal support device of the present embodiment is installed in a non-load state with respect to the vertical load of the upper structure 1 and has a quadrangular columnar laminated rubber body 2. In this laminated rubber body 2, a plurality of thin intermediate steel plates 23 and rubber layers 24 are alternately laminated between a thick upper steel plate 21 and a lower steel plate 22, and these are integrally formed by vulcanization molding. It is a thing.

  A lower collar 4 is fixed to the lower steel plate 22 of the laminated rubber body 2 by bolts 3. Concave portions are formed in the central portion of the upper surface of the lower collar 4 and the central portion of the lower surface of the lower steel plate 22, and the shear key 16 is accommodated in the gap formed by facing the concave portions. As the shear key 16, a column-shaped (for example, a cylinder, a prism, etc.) frame is usually used. Further, the lower rod 4 is fixed to the base plate 5 by bolts 6. The base plate 5 has anchor bolts 8 embedded in the pier 7.

  On the other hand, a key plate 12 projects from the center of the upper surface of the upper steel plate 21 of the laminated rubber body 2. The key plate 12 is fixed to the upper steel plate 21 with fixing bolts 17. The key plate 12 is a columnar body (for example, a prism) having a cross-section in cross section, and as shown in FIG. 2, the upper portion 12a is longer in the horizontal direction than the lower portion 12b, and the upper portion 12a and the lower portion 12b A step portion 12c is formed therebetween.

  The upper collar 13 that engages with the step portion 12 c of the key plate 12 is disposed on the lower surface of the sole plate 10 so as to surround the key plate 12. The upper flange 13 is fixed to the lower surface of the upper structure 1 by screwing the bolts 11 inserted through the bolt insertion holes of the gird 9 of the upper structure 1 and the sole plate 10 into the upper flange 13. ing.

  As shown in FIG. 3, the upper rod 13 has a through hole 13a through which the upper portion 12a of the key plate 12 passes, and the inner surface of the through hole 13a is engaged with the step portion 12c of the key plate 12. It has a frame shape having mating engaging portions 13b. As shown in FIG. 2, the engaging portion 13b is located below the inner peripheral surface of the through hole 13a and is formed so as to protrude toward the central axis of the through hole 13a.

In the present embodiment, the upper rod 13 is engaged with the step portion 12 c of the key plate 12 with the following gaps g 1 to g 3 between the upper steel plate 21 and the key plate 12.
Between the lower surface of the upper collar 13 and the upper surface of the upper steel plate 21: Free space g1
Between the outer peripheral surface of the key plate 12 and the inner peripheral surface of the through hole 13a of the upper collar 13: a gap g2
Between the lower surface of the stepped portion 12c of the key plate 12 and the upper surface of the engaging portion 13b of the upper collar 13 engaged therewith: a gap g3

  In the present embodiment, a gap g4 is further provided between the lower surface of the sole plate 10 (the lower surface of the upper structure 1) exposed from the through hole 13a of the upper collar 13 and the upper surface of the upper portion 12a of the key plate 12. These gaps g1, g2, g3, and g4 are suitably about 3 to 20 mm.

  In the horizontal bearing device configured as described above, when the girder 9 receives a horizontal load in the direction of the bridge axis (the direction indicated by the arrow X in FIG. 1) or the direction perpendicular to the bridge axis due to expansion / contraction due to temperature change, earthquake, or the like, FIG. A horizontal force indicated by an arrow is transmitted in the order of the upper collar 13, the key plate 12, the fixing bolt 17 and the laminated rubber body 2, and the laminated rubber body 2 can be sheared and responded to a horizontal load.

  Further, when a vertical upward load (uplift force) indicated by an arrow in FIG. 5 is applied to the upper structure 1 due to an earthquake or the like, the uplift force is transmitted from the upper rod 13 through the key plate 12 and the fixing bolt 17. This is transmitted to the laminated rubber body 2, thereby preventing the upper structure 1 from falling.

  Further, when the rotation shown by the arrow in FIG. 6 occurs in the upper structure 1 due to the live load, the gaps g1 to g4 exist around the key plate 12, so that the vertical load of the upper structure 1 is applied to the laminated rubber body 2. The rotation of the upper structure 1 can be allowed without giving.

  As mentioned above, although preferred embodiment concerning this invention was shown, it cannot be overemphasized that this invention is applicable to what was changed and improved in the range which is not limited to embodiment mentioned above and does not deviate from the summary of this invention. . For example, as shown in FIG. 7, a recess is formed in the center of the lower surface of the key plate 31 and the center of the upper surface of the upper steel plate 32, and the shear key 33 is accommodated in a gap formed by facing these recesses. You may make it do.

  Usually, the design of the fixing bolt 35 for fixing the key plate 31 to the upper steel plate 32 is determined by the horizontal force and / or the lifting force. According to the present embodiment, the design of the fixing bolt 35 can be determined only by the tensile force, that is, the uplift force by causing the shear key 33 to resist the horizontal force. That is, when the design of the fixing bolt 35 is determined by shearing force, that is, horizontal force, the size of the fixing bolt 35 can be reduced and the number thereof can be reduced. Other configurations are the same as those of the horizontal bearing device according to the above-described embodiment.

  Further, as shown in FIG. 8, the key plate 41 and the shear key 42 may be integrally formed. Thereby, the number of parts can be reduced. In this embodiment, a recess is provided at a position corresponding to the shear key 42 on the upper surface of the upper steel plate 43, and the shear key 42 is accommodated in the recess. Other configurations are the same as those of the horizontal bearing device according to the above-described embodiment.

  As shown in FIG. 9, a concave portion may be provided on the upper surface of the upper steel plate 51, and the lower end portion of the key plate 52 may be accommodated in the concave portion. Thereby, since the lower end part of the key plate 52 accommodated in the said recessed part has the function similar to a shear key, the process of a shear key can be eliminated. Other configurations are the same as those of the horizontal bearing device according to the above-described embodiment.

  As shown in FIG. 10, the elastic layer 64 may be filled into a gap formed between the upper steel plate 62 and the sole plate 63 (upper structure) over the entire circumference on the outer peripheral side from the upper collar 61. That is, by providing the key plate 65 on the upper surface of the upper steel plate 62, a gap is formed between the upper steel plate 62 and the sole plate 63. There is a possibility that dust or the like enters the gaps g1 to g4 through this gap and becomes clogged. If the gaps g1 to g4 are clogged with dust or the like, the functions of the gaps g1 to g4 are impaired, and there is a risk of serious damage to the bridge due to an earthquake or the like.

  That is, by filling the gap with the elastic layer 64, dust or the like can be prevented from entering the gaps g1 to g4, and the function as the horizontal support device can be stabilized. In addition, since the elastic layer 64 can prevent water and the like from entering the apparatus, the anticorrosion property can be improved. As the elastic layer 64, for example, chloroprene rubber or a foam thereof is suitable.

  The elastic layer 64 is filled in the gap on the outer peripheral side of the upper collar 61 over the entire circumference, but may be filled intermittently in the gap depending on the configuration of the horizontal support device. Other configurations are the same as those of the horizontal bearing device according to the above-described embodiment.

  The horizontal bearing device of the present invention can be applied to various structures such as buildings and machinery other than for bridges.

It is a partially broken front view which shows the horizontal bearing apparatus concerning one Embodiment of this invention. It is a partial expanded sectional view which shows the key plate and upper arm vicinity of the horizontal support apparatus shown in FIG. It is a top view which shows the key plate and upper collar of the horizontal support apparatus shown in FIG. It is a schematic explanatory drawing which shows the horizontal force transmission effect | action in the horizontal bearing apparatus shown in FIG. It is a schematic explanatory drawing which shows the uplifting force transmission effect | action in the horizontal bearing apparatus shown in FIG. It is a schematic explanatory drawing which shows the rotational displacement follow-up action in the horizontal bearing apparatus shown in FIG. It is a partially broken front view which shows the horizontal support apparatus concerning other embodiment of this invention. It is a partially broken front view which shows the horizontal support apparatus concerning further another embodiment of this invention. It is a partially broken front view which shows the horizontal support apparatus concerning further another embodiment of this invention. It is a partially broken front view which shows the horizontal support apparatus concerning further another embodiment of this invention. It is a front view which shows the conventional horizontal bearing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Superstructure 2 Laminated rubber body 3,6,11 Bolt 4 Lower collar 5 Base plate 7 Pier 8 Anchor bolt 9 Digit 10 Sole plate 12 Key plate 12a Upper part 12b Lower part 12c Step part 13 Upper collar 13a Through-hole 13b Engagement part 16 Shear key 17 Fixing bolt 21 Upper steel plate 22 Lower steel plate 23 Intermediate steel plate 24 Rubber layer

Claims (4)

Without supporting the vertical load of the upper structure, it is a horizontal bearing device comprising a laminated rubber body that shears in the horizontal direction and supports the horizontal load of the upper structure,
The laminated rubber body is formed by integrally laminating intermediate steel plates and rubber layers alternately between an upper steel plate and a lower steel plate,
On the upper surface of the upper steel plate, a key plate in which the upper portion is longer in the horizontal direction than the lower portion and a step portion is formed between the upper portion and the lower portion is projected,
In the state where an upper collar fixed to the lower surface of the upper structure and having an engaging portion that engages with a step portion of the key plate has a gap between the upper steel plate and the key plate, A horizontal bearing device which is engaged with a step portion of a plate.   The upper collar has a frame shape having a through hole through which an upper portion of the key plate passes in a central portion, and an engaging portion that engages with a step portion of the key plate on an inner peripheral surface of the through hole. Item 1. The horizontal bearing device according to item 1.   The horizontal bearing device according to claim 2, wherein there is a gap between the lower surface of the upper structure exposed from the through hole of the upper collar and the upper upper surface of the key plate.   4. The elastic layer is filled in the gap on the outer peripheral side of the upper collar so as to close the gap between the upper steel plate and the upper structure formed by the key plate. 5. Horizontal bearing device.

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