JP4405981B2 - Elastic bearing device with displacement adjustment function - Google Patents

Description

  The present invention relates to an elastic bearing device used for elastically supporting a load including a vertical load of a bridge or other superstructure, and in particular, the displacement of the superstructure can be adjusted in the direction of the bridge axis. The present invention relates to an elastic bearing device with a displacement adjustment function that is supported in a semi-fixed manner to reduce the burden of bending force on lower structures such as piers or abutments.

  Conventionally, as an elastic bearing device that elastically supports the vertical load of an upper structure, a locking projection that protrudes toward one of the upper metal plate and the lower metal plate and is locked to the other is provided. In addition, there is known a fixed type elastic bearing device including an annular elastic layer around the locking projection between the upper metal plate and the lower metal plate (for example, Patent Documents 1 and 2). reference)

  The fixed elastic bearing device as described above has a fixed fulcrum in the lower structure, elastically supports the vertical load of the upper structure, and allows minute rotation on the fulcrum side due to the deflection of the upper structure. It is a bearing device with an excellent structure.

In the case of the fixed elastic bearing device as described above, the bridge axis direction or the direction perpendicular to the bridge axis is a fixed state in which the upper metal plate and the lower metal plate are integrated in the lateral direction by projections, If the flexural rigidity of the substructure such as the pier or abutment is moderate, or if the support ground is soft, the bending moment acting on the substructure from the fixed support device during an earthquake etc. It can be transmitted to the supporting ground while being buffered.
JP 2006-089939 A JP 2006-089940 A

However, in the case of the above-mentioned fixed elastic bearing device, when the rigidity of the supporting ground is increased, the bending load of the lower structure due to the horizontal force at the time of the earthquake, particularly the bending load of the lower structure of the lower structure such as the pier is increased. There is a problem, the use is limited to the place where the elasticity of the ground side can be expected, and the use is limited to the place where the elasticity of the pier can be expected.
The present invention provides an elastic bearing device with a displacement adjustment function in which the lateral rigidity of the fixed elastic bearing device is reduced by providing an elastic layer further on the fixed elastic bearing device side so that the bearing device is not fixed type but semi-fixed type. The purpose is to do.

The Te displacement adjusting function elastic bearing device smell of the first aspect of the invention in order to achieve the object, the locking that on one of the upper metal plate and lower metal plate projecting toward the other locked to the other A second elastic layer is fixed to the lower surface of the lower metal plate in a fixed elastic support device having a protrusion and a first elastic layer between the upper metal plate and the lower metal plate, A base plate is fixed to the lower surface of the elastic layer. Between the bolt insertion hole of the lower metal plate and the bolt shaft portion such as an anchor bolt for inserting the lower metal plate to the lower structure through the bolt insertion hole, an earthquake occurs. A displacement adjustment gap in the bridge axis direction is provided for shear deformation of the elastic layer by relative displacement of the upper structure and the lower structure in the bridge axis direction at the time, and the bolt insertion hole inner surface of the base plate and the bolt shaft portion Outside Characterized in that it is arranged close to the.
According to a second invention, in the elastic bearing device with a displacement adjusting function of the first invention, a bolt such as an anchor bolt fixed to the lower structure side is inserted through the lower metal plate and the base plate, and the bolt of the lower metal plate is inserted. The insertion hole is a long hole provided with a displacement adjustment gap that is longer in the bridge axis direction than in the direction perpendicular to the bridge axis, and the bolt insertion hole inner surface of the base plate and the bolt shaft outer surface are arranged close to each other. It is characterized by.

According to the present application, one of the upper metal plate and the lower metal plate is provided with a locking projection that protrudes toward the other and is locked to the other, and between the upper metal plate and the lower metal plate. Since the second elastic layer is fixed to either the lower surface of the lower metal plate or the upper surface of the upper metal plate in the fixed elastic bearing device having the first elastic layer, the bridge of the second elastic layer It can exhibit a buffer bearing action due to axial shear deformation, and can reduce and transmit a horizontal force to the lower structure or the upper structure while slightly displacing the fixed elastic bearing device. Therefore, when the upper structure is supported by installing the semi-fixed bridge prevention device with displacement adjustment according to the present invention on the lower structure such as the pier constructed on the hard ground or the fixed structure, the lower part of the lower structure It is possible to reduce the burden of the bending moment acting on the.
According to the first invention , the base plate is fixed to the lower surface of the second elastic layer, the bolt insertion hole of the lower metal plate, the anchor bolt for inserting the lower metal plate to the lower structure through the bolt insertion hole, etc. A displacement adjustment gap in the bridge axis direction for shear deformation of the elastic layer by a relative displacement in the bridge axis direction of the upper structure and the lower structure during an earthquake is provided between the bolt shaft portion of the base plate and the base plate. Since the bolt insertion hole inner surface and the bolt shaft outer surface are arranged close to each other, in addition to the effect of the first invention, the upper and lower structures are relatively displaced in the bridge axis direction. In addition, the base plate can be integrated with a bolt shaft portion such as an anchor bolt in the lateral direction, and the elastic layer can be reliably sheared and deformed in the bridge shaft direction to be buffered.
According to a second invention, in the elastic bearing device with a displacement adjusting function according to the first invention, a bolt such as an anchor bolt fixed to the lower structure side is inserted through the lower metal plate and the base plate, and the bolt of the lower metal plate is inserted. The insertion hole is a long hole provided with a displacement adjustment gap that is longer in the bridge axis direction than in the direction perpendicular to the bridge axis, and the inner surface of the bolt insertion hole of the base plate and the outer surface of the bolt shaft portion are disposed close to each other. When the upper structure and the lower structure are relatively displaced in the direction of the bridge axis or somewhat in the direction perpendicular to the bridge axis, the base plate is integrated laterally with the bolt shaft such as an anchor bolt to ensure an elastic layer. Can be buffered by shear deformation in the direction of the bridge axis or in a direction perpendicular to the bridge axis.

  Next, the present invention will be described in detail based on the illustrated embodiment.

  1 to 7 show an elastic bearing device 7 with a displacement adjusting function according to an embodiment of the present invention.

  The main parts of the elastic bearing device 7 with displacement adjustment function of the present invention are a fixed elastic bearing device 9 above the lower metal plate 1 made of steel, and a second elasticity fixed to the lower surface of the lower metal plate 1 made of steel. And an elastic bearing device having a displacement adjusting function including the layer 5.

The fixed elastic support device 9 includes a steel lower metal plate 1 with a central projection 25 serving as a locking projection, and is fitted to the central projection 25 and placed on the steel lower metal plate 1. Screwed to the upper end male threaded portion of the central projection 25, and the elastic upper body 4 fitted to the central projection 25 and placed on the elastic bearing 4; The uplift stopper 12, the sole plate 10 fixed to the upper structure 22 (main girder 22), and the bolts 20 for fixing the upper metal plate 3 to the structure are configured.
A male screw portion is provided on the upper portion of the central protrusion 25, and a nut is screwed into the male protrusion portion to lock the upper metal plate 3 to prevent its lifting.

  The fixed elastic bearing device 9 is a fixed elastic bearing device incorporating a resistance device of uplift force and horizontal force, and is provided at the center of one metal plate (the lower metal plate 1 made of steel in the illustrated embodiment). The central metal projection 25 projecting into the center hole of the other metal plate (steel upper metal plate 3) opposed to each other with a space therebetween is provided to project the one metal plate (steel lower metal plate 1). And the other metal plate (steel upper metal plate 3) with an elastic support 4 having the first elastic layer 2 interposed therebetween, and an uplift stopper 12 such as a nut fixed to the central projection 25, The outer peripheral surface 28 of the peripheral portion of the center hole 24 of the other metal plate (steel upper metal plate 3) is pressed.

  The elastic support body 4 is configured by providing a first elastic layer 2 such as rubber between a steel upper annular support member 26 and a steel lower annular support member 27, and is used for a high load support. It is considered as an elastic bearing body.

The lower metal plate 1 and the upper metal plate 3 are fixed in such a manner that the relative movement in the lateral direction is restricted by the central protrusion 25, and the upper structure 22 is vertically moved by the first elastic layer 2. And an upper portion outside the upper end portion of the annular recess 18 of the other metal plate (steel upper metal plate 3) in which the uplift stopper 12 is housed and disposed. The annular convex portion 19 formed integrally with the metal plate 3 is fitted as a shear key into the central through hole or the concave portion 21 of the sole plate 10 fixed to the other structure, and the steel upper metal plate 3 and The movement in the lateral direction relative to the sole plate 10 is constrained to achieve lateral integration.
Therefore, it is a resistable structure that does not allow relative horizontal displacement between the steel upper metal plate 3 and the sole plate 10, and is a structure that can resist the uplift force by the uplift stopper 12. A fixed-type elastic bearing device 9 incorporating a resistance device for uplifting force and horizontal force that can resist both uplifting force and horizontal force is provided.
The second elastic layer 5 is integrally fixed to the lower surface of the fixed elastic support device 9, that is, the lower surface of the steel lower metal plate 1, and the lower surface of the second elastic layer 5 is fixed to the lower surface of the second elastic layer 5. The base plate 6 is integrally fixed.

  The lower metal plate 1 made of steel and the second elastic layer 5 or the base plate 6 made of steel and the second elastic layer 5 are fixed together by baking, adhesive or integral molding.

  The annular projection 19 of the other metal plate (steel upper metal plate 3) and the through-hole or recess 18 of the sole plate 10 fixed to the other structure are fitted to restrain lateral movement. So that they can be integrated.

The long holes 13 of the anchor bolt insertion holes opened at the four corners of the steel lower metal plate 1 are long holes 13 in the bridge axis direction, and the long holes 13 on the upper surface side of the steel lower metal plate 1 are formed. A flat rectangular support protrusion 11 is formed around the hole so as to extend in the direction of the bridge axis. The support protrusion 11 is a slip made of a tetrafluoroethylene plate having an anchor bolt insertion long hole. A support member 14 and a steel slide washer 15 are mounted on the support convex portion 11 while the upper end portion of the anchor member 1 is mounted.
The second elastic layer 5 is also provided with a long hole similar to the long hole 13, and the base plate 6 is provided with a circular hole 24 close to a bolt shaft such as an anchor bolt.

  As described above, the sliding support member 14 and the slide washer 15 which are attached to the anchor member 8 such as the anchor bolt 8 and are sequentially arranged on the steel lower metal plate 1 are screwed into the upper end portion of the anchor member 1. The lower metal plate 1 is prevented from being detached from the lower metal plate 1 and the steel lower metal plate 1 is detachably fixed to the lower structure 23 by the anchor member 1 embedded and fixed in the lower structure 23. Yes. The planar shape of the sliding bearing member 14 and the slide washer 15 is longer than the bearing convex portion 11 in the bridge axis direction, and the both sides of the slide washer 15 are perpendicular to the bridge axis of the bearing convex portion 11. Side plate portions that are engaged with both side surfaces.

  A gap G is provided in the bridge axis direction between the long hole 13 and the anchor member 1 in the lower metal plate 1. The gap G allows the upper structure 22 to expand and contract when the temperature changes, and when a horizontal force acts in the bridge axis direction during the earthquake motion by the second elastic layer 5, the upper structure 22 or the lower structure When a horizontal force is transmitted between the objects 23, the second elastic layer 5 is buffered by shear deformation. The gap G is mainly a displacement adjustment gap in the bridge axis direction for shear deformation of the second elastic layer by a relative displacement of the upper structure 22 and the lower structure 23 in the bridge axis direction during an earthquake. Is functioning as

  Although not shown, a bolt is screwed into a female screw cylinder that is inserted into the long hole 13 formed in the steel lower metal plate 1 from the upper surface side and fixed to the upper end portion of the anchor member 8 by welding. By doing so, the steel lower metal plate 1 may be fixed to the lower structure 23.

On the lower side of the elastic bearing device 7 with the displacement adjustment function as described above, the lower metal plate 1, the second elastic layer 5 and the base plate 6 are separated from the lower structure 23 by removing the nut 16. The upper side of the elastic support device 7 with the adjusting function is also removed by removing the bolt 20 inserted into the lower flange or the bottom plate 29 of the steel girder as the upper structure 22 and screwed into the upper metal plate 3. The elastic bearing device 7 with a displacement adjusting function can be exchanged separately from the 22 soleplates 10.
Such an elastic bearing device 7 with a displacement adjusting function can be used even if it is reversed and placed between the upper structure 22 (main girder) and the lower structure 23, and the second elastic layer 5 As shown in the figure, it may be fixed to the lower surface of the lower metal plate 1 or fixed to the upper surface of the upper metal plate 3.

  The sliding bearing member 14 prevents the steel slide washer 15 and the bearing projection 11 on the lower metal plate 1 from coming into direct contact with each other to prevent the frictional force from increasing. The upper metal plate 3 and the lower metal plate 3 can be displaced relative to each other in a tightly tightened state so that the lower metal plate 1 is fixed to the lower structure 23 via .

  Next, the operation of the elastic bearing device 7 with a displacement adjusting function of the present invention will be described.

In the elastic bearing device 7 with a displacement adjusting function configured as described above, when the upper structure 22 expands and contracts in the direction of the bridge axis due to a temperature change, or during an earthquake, the upper structure 22 and the lower structure 23 Is displaced horizontally in the bridge axis direction, the lower metal plate 1 and the base plate 6 are displaced in the bridge axis direction, and the gap G prevents the anchor bolt 8 and the lower metal plate 1 from interfering with each other. Allowing the shear deformation of the second elastic layer 5 and elastically transmitting the transmission of horizontal force between the upper structure 22 and the lower structure 23 by the shear deformation of the second elastic layer 5 in the bridge axis direction. The bending force acting on the lower structure 23 is reduced.
Therefore, it is possible to eliminate the possibility that an unreasonable horizontal force acts on the lower structure 23 and the elastic bearing device 7 with a displacement adjusting function during an earthquake.

  In the case of seismic motion in which a larger horizontal force acts, in the state shown in FIG. Between the structure 22 and the lower structure 23, the anchor bolt 8, the lower metal plate 1, and the upper metal plate 3 are all in contact with each other with steel, so that the entire structure is integrated to support the upper structure 22. become.

  In the embodiment of the present invention, the lower structure 23 and the upper structure 22 may be either steel or concrete structures. In the case of a steel structure, a bolt is used to form the concrete structure. In that case, the lower metal plate 1 or the upper metal plate 3 may be attached to each structure by the anchor bolts 8.

  When the present invention is implemented, the sole plate 10 and the upper metal plate 3 may be integrated in the lateral direction. For example, the annular protrusion 19 may be omitted, and the annular body may be omitted. The sole plate 10 and the upper metal plate 3 may be fitted.

  When the present invention is carried out, the upper metal plate 3 and the lower metal plate 1 are integrated in the vertical direction. Instead of the nut, a female screw hole is provided in the central protrusion 25, and the central protrusion A bolt inserted into a washer projecting outside 25 is screwed into the female screw hole, and the washer is fixed, or a flanged bolt is fixed to the female screw hole, and the upper surface in the recess of the upper metal plate 3 is fixed. It is good also as a structure which opposes uplift force by pressing down

It is the partially longitudinal front view which showed the state which installed the elastic bearing apparatus with a displacement adjustment function of one Embodiment of this invention, and was seen from the bridge-axis direction. It is a cross-sectional plan view of the elastic bearing device with a displacement adjusting function shown in FIG. It is a partially longitudinal front view which cut | disconnects and shows the bolt penetration hole vicinity of the lower metal plate in the elastic support apparatus with a displacement adjustment function shown in FIG. FIG. 3 is a partially longitudinal side view showing the vicinity of a bolt insertion hole of a lower metal plate in the elastic bearing device with a displacement adjusting function shown in FIG. 2. FIG. 3 is a partially cutaway plan view showing a state in which a nut attached to a bolt such as an anchor bolt in the elastic bearing device with a displacement adjusting function shown in FIG. 2 is removed. FIG. 3 is a partially longitudinal side view showing a state where an elastic layer is subjected to a buffering support due to shear deformation in earthquake motion. It is a side view which shows the state which installed the elastic bearing apparatus with a displacement adjustment function of this invention in lower structures, such as a bridge pier.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lower metal plate 2 1st elastic layer 3 Upper metal plate 4 Elastic support body 5 2nd elastic layer 6 Base plate 7 Elastic support device 8 with a displacement adjustment function Anchor bolt 9 Fixed elastic support device 10 Sole plate 11 Support protrusion 12 Up Lift stop fitting 13 Long hole 14 Sliding support member 15 Slide washer 16 Nut 18 Annular recess 19 Annular projection 20 Bolt 21 Central through hole or recess 22 Upper structure 23 Lower structure 24 Circular hole 25 Central projection 26 Upper annular support Member 27 Lower annular support member 28 Perimeter protrusion 29 Flange or bottom plate

Claims (2)

One of the upper metal plate and the lower metal plate is provided with a locking projection that protrudes toward the other and is locked to the other, and a first elastic layer is provided between the upper metal plate and the lower metal plate. A second elastic layer is fixed to the lower surface of the lower metal plate, a base plate is fixed to the lower surface of the second elastic layer, a bolt insertion hole of the lower metal plate, and the bolt insertion hole The elastic layer is inserted between the bolt shaft portion of an anchor bolt or the like that is inserted in the lower metal plate and attached to the lower structure by relative displacement of the upper structure and the lower structure in the bridge axis direction during an earthquake. provided bridge axis direction of the displacement adjustment gap for causing the shear deformation, displacement of the adjustment function elastic support you, characterized in that it is arranged close to the bolt insertion hole inner surface of the base plate the bolt shaft outer surface apparatus. Bolts such as anchor bolts that are fixed to the lower structure side across the lower metal plate and the base plate are inserted, and the bolt insertion hole of the lower metal plate has a displacement adjustment gap that is longer in the bridge axis direction than in the direction perpendicular to the bridge axis. The elastic bearing device with a displacement adjusting function according to claim 1 , wherein the inner surface of the bolt insertion hole of the base plate and the outer surface of the bolt shaft portion are arranged close to each other.

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