JP2009079464A - Bearing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing structure reduced in height and capable of sufficiently following up the upward displacement of an upper structure. <P>SOLUTION: This bearing structure comprises a lower shoe 1 disposed on the lower structure 4, an upper shoe 2 disposed above the lower shoe 1 and supporting the upper structure 5, and an elastic body 3 interposed between the lower shoe 1 and the upper shoe 2. A hollow part 30 is formed in the elastic body 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a support structure interposed between a lower structure and an upper structure.

  Generally, in a bridge such as an elevated road, a support structure is interposed between a pier and a main girder. Conventionally, as such a support structure, there is a laminated rubber bearing having a configuration in which a steel plate and a rubber layer are laminated. In this laminated rubber bearing, the rubber layer bulges sideways and is crushed in the vertical direction by the load of the upper structure such as the main girder, and the thickness of the rubber layer is reduced. Thereby, the laminated rubber bearing is allowed to move upward by the reduced thickness of the rubber layer. Therefore, the main girder bends due to the passage of a large vehicle, the main girder ends lift, and even if the support structure is pulled upward, the rubber layer is not peeled off from the steel sheet, allowing upward displacement tracking. It has become.

  On the other hand, another example of the bearing structure is a sealed rubber bearing plate bearing. The sealed rubber bearing plate support has a structure in which an elastic body (rubber) is provided in a concave portion of a lower arm fixed to the upper end surface of a bridge pier, and an intermediate plate is put on the elastic body to seal the elastic body. . Further, an upper rod fixed to the main girder is placed on the intermediate plate. In this sealed rubber support plate support, since the elastic body (rubber) is sealed and there is no place for the elastic body to bulge, the elastic body does not compress even if a vertical load is applied to the support structure due to the incompressibility of the rubber. Although it is not crushed, displacement can be followed even when the main girder is bent. That is, when the main girder is bent, an upward tensile force acts on one side of the support structure (the end face side of the main girder) and the other side of the support structure (the central part of the main girder) ) Has a downward compressive force. At this time, since the elastic body escapes to the one side portion by the downward compressive force, it is possible to follow the upward displacement in the one side portion.

In recent years, a support structure having a configuration in which an elastic body is interposed between a lower rod and an upper rod has been provided. In this support structure, irregularities are respectively formed on the upper surface of the lower collar and the lower surface of the upper collar, and the lower collar and the upper collar are combined so as to fit the irregularities of the lower collar and the irregularities of the upper collar. Moreover, in this support structure, the through-hole for expanding an elastic body is formed in the cylindrical part of the lower collar. (For example, refer to Patent Document 1).
JP 2007-23582 A

  However, in the conventional laminated rubber bearing described above, if the rubber layer is thickened in order to improve displacement followability, the height of the bearing structure is increased. Therefore, for example, even if an attempt is made to install a laminated rubber bearing instead of the above-described sealed rubber bearing plate bearing, there arises a problem that it does not fit between the pier and the main girder.

  Further, in the above-described conventional sealed rubber bearing plate support, as described above, even if the elastic body is not crushed, it is possible to follow the displacement when the main girder is bent. Since it is large, there is a problem that the elastic body cannot be bonded to the lower eyelid or the intermediate plate. Therefore, in the above-described conventional sealed rubber support plate support, the elastic body is placed on the lower arm in a non-adhered state, and the intermediate plate is placed on the elastic body in a non-adhered state. And the vertical direction is not constrained.

  Further, in the support structure described in Patent Document 1 described above, the through hole is formed in the lower arm, and a part of the elastic body is bulged into the through hole due to the vertical load, so that the elastic body is crushed. Although it is possible to follow the displacement in the upward direction by the amount of displacement, the amount of crushing displacement is small and it cannot cope with a large displacement.

  In the present invention, the above-described conventional problems are considered, the height of the support structure can be kept low, and the elastic body can be bonded to the lower arm and the upper arm, respectively. An object of the present invention is to provide a support structure that can sufficiently follow the upward displacement of the upper structure.

  The support structure according to the present invention is interposed between a lower collar disposed on the lower structure, an upper collar disposed above the lower collar and supporting the upper structure, and the lower collar and the upper collar. A support structure including an elastic body is characterized in that a hollow portion is formed in the elastic body.

  Due to such characteristics, the hollow portion secures a space for the elastic body to escape when a vertical load is applied. Therefore, when a vertical load is applied to the support structure, a part of the elastic body expands in the hollow portion. Is issued. Thereby, the elastic body is crushed and deformed. That is, since the elastic body is deformed without changing its volume when pressurized, the thickness (height) of the elastic body is reduced by the amount bulged into the hollow portion. Therefore, upward displacement is allowed by the reduced thickness of the elastic body.

In the support structure according to the present invention, it is preferable that a cylindrical portion protrudes from the upper surface of the lower rod and / or the lower surface of the upper rod, and the elastic body is accommodated inside the cylindrical portion.
Thereby, since the elastic body is provided in the space (constrained room) surrounded by the upper surface of the lower collar, the lower surface of the upper collar and the inner circumferential surface of the cylindrical portion, the outer circumferential surface of this elastic body is Restrained by the cylinder. Therefore, when a vertical load is applied to the support structure, the elastic body swells in the hollow portion and the elastic body is crushed and deformed to a certain extent, but the elastic body escapes when the hollow portion is blocked by the elastic body. As a result, the elastic body is not crushed any more.

Further, in the support structure according to the present invention, a cylindrical portion protrudes from one of the upper surface of the lower collar and the lower surface of the upper collar, and the upper surface of the lower collar and the lower surface of the upper collar It is preferable that a protruding portion disposed on the outer side or the inner side of the cylindrical portion is provided on either side.
Thereby, when the lower rod and the upper rod are relatively horizontally displaced, the cylindrical portion and the projecting portion are engaged to perform a stopper function. Thereby, the relative horizontal displacement of a lower eyelid and an upper eyelid is controlled.

Further, in the support structure according to the present invention, the projecting portion has an outer diameter smaller than the inner diameter of the cylindrical portion, and has a convex shape in a vertical cross-sectional view fitted into the inner side of the cylindrical portion. It is preferable that the elastic body is interposed between any one of the upper surface and the lower surface of the upper collar and the tip end surface of the protrusion.
Thereby, while fulfill | performing the above-mentioned stopper function, the shape of the lower eyelid or the upper eyelid which has a protrusion part becomes a simple shape.

Moreover, it is preferable that the support structure which concerns on this invention has an elastic body interposed between the said cylinder part and the said protrusion part.
As a result, when the lower rod and the upper rod are relatively horizontally displaced, the elastic body between the tube portion and the protruding portion exerts a buffer function, and an impact when the tube portion and the protruding portion are engaged with each other is exerted. Alleviated. Further, the horizontal displacement tracking function is achieved by the crushing deformation of the elastic body between the cylindrical portion and the protruding portion.

Further, the support structure according to the present invention is configured such that the lower heel and the lower structure and / or the upper heel and the upper structure are relatively disposed in the horizontal direction on the lower surface of the lower heel and / or the upper surface of the upper heel. It is preferable that a sliding material for displacement is provided.
Thereby, when the lower structure and the upper structure are relatively horizontally displaced, the horizontal displacement is allowed by the sliding material. For example, when a slip material is provided between the lower structure and the lower arm, when the lower structure and the upper structure are displaced horizontally, the support structure is relatively horizontal with respect to the lower structure. Displace. In addition, in the case where a slip material is provided between the upper structure and the upper arm, when the lower structure and the upper structure are relatively horizontally displaced, the support structure is relatively horizontal with respect to the upper structure. Displace.

In the support structure according to the present invention, it is preferable that the hollow portion penetrates the elastic body in the vertical direction.
This further increases the space in which the elastic body escapes when a vertical load is applied. As a result, the elastic body is more easily crushed and deformed, the thickness (height) of the elastic body is further reduced, and the upward allowable displacement amount is increased.

In the support structure according to the present invention, the hollow portion may be a non-through bottomed hole.
Thereby, by adjusting the depth of the hollow portion, the volume of the hollow portion is adjusted without changing the diameter (planar shape) and number of the hollow portions, and the crushing displacement amount of the elastic body is adjusted.

In the support structure according to the present invention, it is preferable that a through hole communicating with the hollow portion is formed in the lower collar and / or the upper collar.
Thereby, a mold such as a core for forming the hollow portion can be pulled out from the through hole, and an elastic body having the hollow portion can be easily formed.
That is, as a method of manufacturing the support structure having the above-described structure, the lower collar and the upper collar are arranged to face each other with a space therebetween, and the rod-shaped core is inserted from the through-hole formed in the lower collar and / or the upper collar. The step of disposing the core between the lower arm and the upper arm, the step of pouring the molten rubber material between the lower arm and the upper arm, molding the elastic body, and pulling out the core from the through hole Forming a hollow portion in the elastic body.

In the support structure according to the present invention, the through hole is preferably closed with a plug.
Thereby, after the process of pulling out the core from the through hole, the process of closing the through hole with the plug body is performed, so that the strength of the lower eyelid and the upper eyelid due to the through hole can be suppressed. That is, when the through hole is formed in the lower collar or the upper collar, the strength thereof is lowered, but the strength of the lower collar or the upper collar is reinforced by disposing the plug body in the through hole.

In the support structure according to the present invention, it is preferable that the elastic body is bonded to the upper surface of the lower rod and the lower surface of the upper rod.
Thereby, the displacement of an up-down direction is controlled. That is, when a tensile force in the vertical direction that separates the lower eyelid from the upper eyelid is applied, the elastic body is adhered to the lower eyelid or the upper eyelid, so that the adhesive force resists the tensile force and It becomes difficult to leave the bag.

  According to the support structure of the present invention, when a vertical load is applied to the support structure, a part of the elastic body bulges into the hollow portion, the elastic body is crushed and deformed, and the thickness of the elastic body is reduced. Therefore, it is possible to follow the upward displacement of the upper structure. Further, as described above, the elastic body is crushed and deformed by the vertical load and can be displaced upward, so that the elastic body can be bonded to the lower eyelid and the upper eyelid, respectively. In addition, since the amount of crushing deformation of the elastic body can be adjusted by changing the number and size of the hollow portions, it is possible to sufficiently follow the upward displacement of the upper structure without increasing the thickness of the elastic body. The height of the support structure can be kept low.

  Hereinafter, first to fourth embodiments of a support structure according to the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a plan view of a support structure in the present embodiment, and FIG. 2 is a half sectional view of the support structure in the present embodiment.

  As shown in FIGS. 1 and 2, the support structure in the present embodiment is a fixed support that is interposed between the upper end surface of the bridge pier 4 and the lower surface of the main girder 5. This support structure was interposed between a lower heel 1 fixed to a bridge pier 4 (lower structure), an upper ridge 2 fixed to a main girder 5 (upper structure), and a lower ridge 1 and an upper ridge 2. And an elastic body 3.

  The lower rod 1 is a flat steel member fixed to the upper end surface of the pier 4 by a plurality of (four in FIG. 1) anchor bolts 6. More specifically, the lower rod 1 is rectangular in plan view, and bolt holes 10 through which the anchor bolts 6 are inserted are formed at the four corners. Further, an inner cylinder portion 11 (protruding portion) is provided on the upper surface of the lower rod 1 so as to project. The inner cylinder portion 11 is a cylindrical wall portion and is formed integrally with the lower collar 1. Moreover, the outer diameter of the inner cylinder part 11 is smaller than the inner diameter of the outer cylinder part 20 (cylinder part) mentioned later.

  The upper rod 2 is disposed above the lower rod 1 and supports the main beam 5, and is a flat steel member fixed to the lower surface of the main beam 5 with bolts 7. More specifically, the upper collar 2 has a circular shape in plan view, and an outer cylinder portion 20 is suspended from the lower surface thereof. The outer cylinder portion 20 is a cylindrical wall portion extending along the outer edge of the upper collar 2 over the entire circumference of the upper collar 2, and is formed integrally with the upper collar 2. In other words, the upper collar 2 has a configuration in which a concave portion having a circular shape in plan view is formed on the lower surface thereof. The outer cylinder part 20 and the inner cylinder part 11 are formed substantially coaxially, and the inner cylinder part 11 is disposed inside the outer cylinder part 20. Note that a gap is provided between the inner peripheral surface of the outer cylindrical portion 20 and the outer peripheral surface of the inner cylindrical portion 11.

In addition, a plurality of round hole-shaped through holes 21 are formed in the upper collar 2. These through-holes 21 are evenly disposed at positions inside the above-described inner cylinder portion 11 in plan view, and communicate with hollow portions 30 described later. As shown in FIG. 3, it is preferable that a plug body 23 such as a hexagon socket bottle is fitted in the through hole 21 and the through hole 21 is closed. More specifically, a female threaded through hole 21 is formed in the upper collar 2, and a male threaded plug body 23 is screwed into the through hole 21. The plug body 23 has the same length as the through hole 21 or longer than the through hole 21, and is screwed so that the plug body 23 does not protrude from both ends of the through hole 21.
A sole plate 8 having a bolt hole (not shown) through which the bolt 7 is passed is interposed between the upper rod 2 fixed by the bolt 7 and the main beam 5.

  The elastic body 3 is made of rubber or a thermoplastic elastomer, and various known materials can be used. The elastic body 3 is vulcanized and bonded to the upper surface of the lower collar 1 and the lower surface of the upper collar 2. Further, the elastic body 3 is accommodated inside the outer cylinder portion 20 and is also interposed between the inner cylinder portion 11 and the outer cylinder portion 20 described above. Therefore, the tip of the inner cylinder 11 is embedded in the elastic body 3.

  The elastic body 3 is formed with a plurality of round hole-shaped hollow portions 30 penetrating the elastic body 3 in the vertical direction. The hollow portion 30 is a hole having substantially the same diameter as the through hole 21 described above, and is formed at a position corresponding to the through hole 21. More specifically, one hollow portion 30 is formed at the center of the elastic body 3 and four around it. Note that the position, number, diameter, and the like of the hollow portion 30 can be changed as appropriate.

4A is a cross-sectional view schematically showing a support structure in a state where a vertical load (initial load) is not applied, and FIG. 4B is a schematic view of the support structure in a state where a vertical load is applied. FIG.
As shown in FIG. 4A, when the main girder 5 is not installed on the support structure and no vertical load is applied to the support structure, the upper surface of the lower rod 1 and the lower end surface of the outer cylinder portion 20 A gap larger than the crushing deformation amount d of the elastic body 3 after the main girder 5 is installed is provided between them. At this time, the inside of the hollow portion 30 is hollow.

  On the other hand, as shown in FIG. 4B, when the main girder 5 is installed on the support structure and a vertical load is applied to the support structure, a space for the elastic body 3 to escape is secured by the hollow portion 30. The elastic body 3 is crushed and deformed. That is, when a vertical load is applied to the support structure, a part of the elastic body 3 bulges into the hollow portion 30. Then, the thickness of the elastic body 3 is reduced by the amount swelled into the hollow portion 30, the position of the upper collar 2 sinks, and the lower end surface of the outer cylinder portion 20 approaches or contacts the upper surface of the lower collar 1. . At this time, since the hollow portion 30 formed in the elastic body 3 penetrates the elastic body 3 in the vertical direction, there is a large space for part of the elastic body 3 to escape when a vertical load is applied. The crush deformation amount d of 3 also becomes sufficiently large.

  Further, since the elastic body 3 is provided in a space surrounded by the upper surface of the lower rod 1, the lower surface of the upper rod 2 and the inner peripheral surface of the outer cylindrical portion 20, the outer peripheral surface of the elastic body 3 is outside. It is restrained by the cylinder part 20. Therefore, as described above, when a vertical load is applied to the support structure, the elastic body 3 swells into the hollow portion 30 and the elastic body 3 is crushed to some extent. Since there is no place for the elastic body 3 to escape when the plug is closed, the elastic body 3 will not be crushed any more. Note that the number and diameter of the hollow portions 30 are adjusted so that the main beam 5 is arranged at a predetermined height level.

  Further, when the support structure having the above-described configuration is interposed between the upper end surface of the bridge pier 4 and the lower surface of the main girder 5, the horizontal displacement is relatively between the pier 4 and the main girder 5. When this occurs, the elastic body 3 is crushed and deformed between the inner cylinder portion 11 and the outer cylinder portion 20, and the lower collar 1 and the upper collar 2 are relatively horizontally displaced. And if it displaces to some extent, the inner cylinder part 11 and the outer cylinder part 20 will engage each other, and a stopper function will be exhibited, and the said horizontal displacement will be controlled. At this time, the elastic body 3 between the inner cylinder part 11 and the outer cylinder part 20 reduces the impact when the inner cylinder part 11 and the outer cylinder part 20 are engaged.

  Further, when the main girder 5 is bent and lifted at the end of the main girder 5 and a vertical tensile force acts on the support structure, the upper rod 2 moves upward relative to the lower rod 1. At this time, as described above, since the elastic body 3 is crushed and deformed by the vertical load in advance, the elastic body 3 is allowed to deform upward by the amount of the crushed deformation d. Further, since the elastic body 3 is vulcanized and bonded to the upper surface of the lower collar 1 and the lower surface of the upper collar 2, the adhesive force resists the above-described tensile force.

  According to the support structure having the above-described configuration, the elastic body 3 is allowed to be displaced upward by the amount of deformation c, so that the main girder 5 bends due to the passage of a large vehicle or the like and Even if the lift occurs, it can sufficiently follow the upward displacement of the end portion of the main girder 5. Further, since the upward displacement is allowed as described above, the elastic body 3 can be bonded to the upper surface of the lower rod 1 and the lower surface of the upper rod 2, respectively. And if the elastic body 3 is each adhere | attached on the upper surface of the lower collar 1, and the lower surface of the upper collar 2, the control of the vertical displacement by the adhesive force can also be expected.

  Moreover, according to the support structure having the above-described configuration, the elastic body 3 can be reduced in rigidity by changing the number and size of the hollow portions 30, and the crushing deformation amount d of the elastic body 3 can be adjusted. It is. For this reason, it is possible to sufficiently follow the upward displacement of the end portion of the main girder 5 without increasing the thickness of the elastic body 3, and the height of the support structure can be kept low. Therefore, the bearing structure may have a small cross-sectional rigidity and can be made into a compact-shaped bearing structure. For example, when it is replaced with an existing steel bearing, it should be installed even when the installation space is low. Is possible.

  Further, the outer cylinder portion 20 projects from the lower surface of the upper collar 2, the elastic body 3 is accommodated inside the outer cylinder portion 20, and the hollow portion 30 is elastic when a vertical load is applied to the support structure. When the elastic body 3 is closed by the body 3, there is no place for the elastic body 3 to escape, and the elastic body 3 is no longer crushed. Therefore, the elastic body 3 can be held in a certain crushing deformation state.

  Moreover, since the inner cylinder part 11 protrudes from the upper surface of the lower collar 1 and the outer cylinder part 20 protrudes from the lower surface of the upper collar 2, the lower collar 1 and the upper collar 2 are relatively horizontally displaced. When it does, horizontal displacement is controlled because inner cylinder part 11 and outer cylinder part 20 fulfill | perform a stopper function. Therefore, there is no need to separately provide a member such as a side block that regulates the horizontal displacement. Therefore, the support structure can be reduced in size and installed in a narrow space.

  Further, since the elastic body 3 is also interposed between the inner cylinder portion 11 and the outer cylinder portion 20, the elastic body 3 between the inner cylinder portion 11 and the outer cylinder portion 20 is buffered against horizontal displacement. Demonstrate the function. Thereby, horizontal force can be absorbed and horizontal displacement can be controlled well. Moreover, the elastic body 3 between the inner cylinder part 11 and the outer cylinder part 20 is crushed and deformed, and can follow the horizontal displacement. Thereby, it is possible to cope with expansion and contraction of the main beam 5.

  Moreover, since the hollow part 30 formed in the elastic body 3 penetrates the elastic body 3 in the vertical direction, a space in which a part of the elastic body 3 escapes when a vertical load is applied is further increased. As a result, the elastic body 3 is more easily crushed and deformed, the thickness of the elastic body 3 is further reduced, and the upward allowable displacement is increased. Thereby, the support structure can follow a large vertical displacement.

  Further, since the through hole 21 communicating with the hollow part 30 is formed in the upper collar 2, a core (not shown) for forming the hollow part 30 can be pulled out from the through hole 21, and the hollow The elastic body 3 having the portion 30 is easily formed. More specifically, when manufacturing the above-described support structure, first, the lower rod 1 and the upper rod 2 are arranged to face each other. Further, a core (not shown) for forming the hollow portion 30 is installed at a predetermined position between the lower rod 1 and the upper rod 2. For example, a cylindrical core is inserted from the through hole 21 and installed between the lower rod 1 and the upper rod 2. As the above-described core, for example, a bolt can be used. Next, an elastic body 3 is formed by filling a dissolved rubber material or the like between the lower rod 1 and the upper rod 2. Then, after the elastic body 3 is cured, the above-described core is pulled out from the through hole 21. Thereby, the hollow part 30 is formed in the elastic body 3. Thus, since the elastic body 3 having the hollow portion 30 is easily formed, the support structure can be easily manufactured.

  In addition, by fitting the plug body 23 into the through hole 21 described above, it is possible to suppress the strength reduction of the upper collar 2 due to the through hole 21, and to prevent cracks around the through hole 21.

[Second Embodiment]
In the first embodiment described above, the fixed support structure has been described. However, as shown in FIG. 5, the present invention may be a movable support structure. In the present embodiment, the above-described movable support structure will be described. In addition, about the structure similar to above-mentioned 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 5, the movable support structure has a structure in which a sliding member 22 for horizontally displacing the upper rod 2 and the upper structure such as the main girder 5 is provided on the upper surface of the upper rod 2. Alternatively, a sliding member 22 is provided on the lower surface of the lower arm 1 to relatively displace the lower arm 1 and the lower structure such as the pier 4 in the horizontal direction.

  Here, the above-described movable support structure will be described in detail with reference to FIGS. Note that the extending direction of the main girder 5 (vertical direction in FIG. 6) is a digit row direction, and the direction orthogonal to the digit row direction (lateral direction in FIG. 6) is a digit width direction.

  As shown in FIGS. 6 and 7, in the movable support structure, the intermediate plate 9 is placed on the upper surface of the upper collar 2. The intermediate plate 9 is a rectangular steel plate extending in the direction of the beam and is fixed to the main beam 5 with bolts 7. A sole plate 8 is interposed between the intermediate plate 9 and the main beam 5. A stainless steel plate 90 is fixed to the lower surface of the intermediate plate 9. In addition, a sliding plate 22 (sliding material) that is slidably contacted with the stainless steel plate 90 is provided on the upper surface of the upper collar 2. At this time, the upper collar 2 is not fixed to the main girder 5, and the upper horizontal collar 2 and the main girder 5 can be relatively horizontally moved. As the sliding plate 22, polytetrafluoroethylene, ultrahigh molecular weight polyethylene having a molecular weight of 1 million or more, or the like can be used. Further, step portions 91 extending in the column direction are formed on both sides of the intermediate plate 9 in the column width direction. The step 91 is formed to have a predetermined length and is concave in plan view.

  On the other hand, a pair of side blocks 12 are provided on the upper surface of the lower rod 1 so as to be spaced apart from each other in the beam width direction. The pair of side blocks 12 are respectively disposed on both sides of the intermediate plate 9, and are arranged at the upper end of the side block 12 on the inner side of the stepped portion 91 of the intermediate plate 9 and are engaged with the end of the stepped portion 91. A locking portion 12a to be stopped is projected.

  According to the movable support structure having the above-described configuration, since the slide plate 22 and the stainless steel plate 90 are slid freely, the displacement in the direction of the beam is equivalent to the length of the step portion 91. Only distance is allowed. On the other hand, displacement in the digit width direction is restricted by the side blocks 12 on both sides. Thereby, even when the main girder 5 expands and contracts due to the influence of temperature or the like, the support structure can follow the horizontal displacement in the girder direction.

  The movable support structure described above is configured such that the sliding plate 22 and the stainless steel plate 90 are disposed on the upper bridge 2 and the lower bridge 1 is fixed to the pier 4. In the present invention, the slide plate 22 and the stainless steel plate 90 may be disposed under the lower rod 1 so that the lower rod 1 moves horizontally with respect to the pier 4. More specifically, a base plate fixed by anchor bolts 6 is installed on the upper end surface of the pier 4 and the lower rod 1 is arranged on the base plate. Then, the stainless steel plate 90 is fixed to the upper surface of the base plate, and the sliding plate 22 is fixed to the lower surface of the lower rod 1. At this time, the lower bridge 1 is not fixed to the pier 4 but is configured to be capable of relative horizontal movement between the lower bridge 1 and the pier 4. Thereby, similarly to the movable support structure described above, it is possible to follow the horizontal displacement.

[Third Embodiment]
In the first and second embodiments described above, the cylindrical inner cylinder portion 11 is formed as the protruding portion. However, in the present invention, as shown in FIG. 8, the disk-shaped convex portion 111 is used as the protruding portion. It is also possible to adopt a configuration in which is protruded from the lower arm 1. In the present embodiment, a support structure in which the protrusion 111 is protruded from the lower collar 1 will be described. In addition, about the structure similar to above-mentioned 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 8, the above-described convex portion 111 has a convex shape in a longitudinal sectional view, and the outer diameter thereof is smaller than the inner diameter of the outer cylindrical portion 20 and is fitted inside the outer cylindrical portion 20. . The outer peripheral surface of the convex portion 111 is formed along the inner peripheral surface of the outer cylindrical portion 20, and the outer peripheral surface of the convex portion 111 and the inner peripheral surface of the outer cylindrical portion 20 are spaced apart and elastic. The body 3 is interposed. Further, the front end surface of the convex portion 111 faces the lower surface of the upper collar 2 with a space therebetween, and the elastic body 3 is interposed between the front end surface of the convex portion 111 and the lower surface of the upper collar 2. ing.

In the support structure having the above-described configuration, when a relative horizontal displacement occurs between the bridge pier 4 and the main girder 5, the elastic body 3 is crushed and deformed between the convex portion 111 and the outer cylinder portion 20. 1 and the upper collar 2 are relatively horizontally displaced. And if it displaces to some extent, the convex part 111 and the outer cylinder part 20 will mutually engage, and a stopper function will be exhibited, and the said horizontal displacement will be controlled.
Further, the shape of the lower collar 1 having the convex portion 111 is simplified as compared with the lower collar 1 having the inner cylinder portion 11 in the first embodiment.

  According to the support structure having the above-described configuration, it is possible to restrict horizontal displacement and reduce the manufacturing cost of the lower rod 1 by shaving. In other words, in the case of the lower collar 1 having the above-described convex portion 111, the manufacturing cost can be reduced to the extent that the inner peripheral hole need not be cut in the central portion.

[Fourth Embodiment]
As shown in FIGS. 9 and 10, the present invention may be configured such that the restraining member 31 is included in the elastic body 3. In the present embodiment, a support structure provided with the restraining member 31 will be described. In addition, about the structure similar to the above-mentioned 1st-3rd embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 9 and FIG. 10, the elastic body 3 in the present embodiment has a hollow portion 30 formed only in the central portion thereof, and the elastic body 3 includes the elastic body 3. A restraining member 31 having a longitudinal elastic modulus higher than the longitudinal elastic modulus is included. The restraining member 31 is an annular steel plate that surrounds the hollow portion 30, and is disposed at a substantially central portion in the vertical direction of the elastic body 3 (the thickness direction of the elastic body 3).

  According to the support structure including the restraining member 31 described above, since the restraining member 31 is included in the elastic body 3, the amount of crushing deformation d ′ of the elastic body 3 is reduced. Compared with the case where the crush deformation amount d ′ is set, the degree of freedom in design can be increased.

  In the above-described embodiment, the hollow portion 30 is formed in the hole in the central portion of the annular restraining member 31. However, in the present invention, the hollow portion 30 is closed by the restraining member. For example, it is also possible to use a disk-shaped restraining member having no hole in the central portion. A plurality of restraining members may be disposed on the same plane. For example, the annular steel plates may be arranged in the same plane in a state of being divided into a plurality. In this case, the steel plate is preferably divided into two.

Although the embodiment of the support structure according to the present invention has been described above, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the scope of the present invention.
For example, in the above-described first to third embodiments, the elastic body 3 is formed by filling a melted rubber material or the like between the lower rod 1 and the upper rod 2, and the elastic body 3 is Although vulcanized and bonded to the upper surface of the lower rod 1 and the lower surface of the upper rod 2, the present invention is not limited to this. For example, it is also possible to sandwich a pre-formed elastic body 3 between the lower heel 1 and the upper heel 2 and adhere the elastic body 3 to the upper surface of the lower heel 1 and the lower surface of the upper heel 2 with an adhesive. is there. Furthermore, the elastic body 3 may not be bonded to the upper surface of the lower collar 1 or the lower surface of the upper collar 2. When the elastic body 3 is previously formed, the elastic body 3 may be divided into a plurality of parts, and the elastic body 3 may be formed by combining a plurality of elastic body parts. Thereby, the quantity of the hollow part 30 can be adjusted suitably.

  In the first to third embodiments described above, a space is provided between the outer peripheral surface of the inner cylindrical portion 11 or the convex portion 111 and the inner peripheral surface of the outer cylindrical portion 20. The elastic body 3 is interposed between the outer cylinder portion 20 and the outer cylinder portion 20, or between the convex portion 111 and the outer cylinder portion 20. The inner circumferential surface of the portion 20 is in contact with the elastic body 3 between the inner cylindrical portion 11 and the outer cylindrical portion 20 or between the convex portion 111 and the outer cylindrical portion 20. It is also possible to do. Thereby, the relative horizontal displacement of the lower collar 1 and the upper collar 2 is restricted by the engagement of the inner cylinder part 11 or the convex part 111 and the outer cylinder part 20, and the restraint in the horizontal direction is improved.

  In the first to third embodiments described above, the inner cylinder portion 11 protrudes from the upper surface of the lower rod 1 and the outer cylinder portion 20 protrudes from the lower surface of the upper rod 2. The outer cylinder part (cylinder part) may protrude from the upper surface of the lower collar 1, and the inner cylinder part (protrusion part) may protrude from the lower surface of the upper collar 2.

  In the first and second embodiments described above, the cylindrical inner cylinder portion 11 is formed as the protruding portion, and in the third embodiment, the disk-shaped convex portion 111 is formed as the protruding portion. However, the protruding portion in the present invention is not limited to the above-described inner cylindrical portion 11 and the protruding portion 111, and may be, for example, a divided wall-shaped protruding portion or a protruding portion having other shapes. It may be. Further, in the above-described first to third embodiments, the protruding portions (inner cylinder portion 11, convex portion 111) are disposed inside the cylinder portion (outer cylinder portion 20). A protruding portion may be disposed outside the cylindrical portion.

  In the first to third embodiments described above, the cylindrical outer tube portion 20 is formed as the tube portion, but the present invention is not limited to the cylindrical tube portion. For example, the cylindrical portion may be a square cylindrical portion, or the outer peripheral shape may be a rectangular shape in plan view and the inner peripheral shape may be a circular cylindrical shape in plan view. Also good.

  Furthermore, the present invention can be configured such that the cylindrical portion is provided on either the upper surface of the lower rod 1 or the lower surface of the upper rod 2 and there is no protruding portion. Furthermore, this invention can also be set as the structure by which the cylinder part is not formed in the upper surface of the lower collar 1 or the lower surface of the upper collar 2.

  Further, in the first to third embodiments described above, the through-hole-shaped hollow portion 30 penetrating the elastic body 3 in the vertical direction is formed in the elastic body 3. The shape of the hollow part to be formed can be changed as appropriate. For example, as shown in FIG. 11, a hollow portion 130 having a bottomed hole (non-through hole) shape may be formed in the elastic body 3. In the bottomed hole-shaped hollow portion 130, by adjusting the depth, the volume of the hollow portion 130 is adjusted without changing the diameter (planar shape) and number, and the amount of crushing displacement of the elastic body 3 is reduced. Since it is adjusted, the degree of freedom in design can be improved. Moreover, the slit-shaped hollow part may be formed in the elastic body 3, and the hollow part of another shape may be formed in the elastic body 3 as for this invention.

  Further, in the first to third embodiments described above, the lower eyelid 1 has a rectangular shape in plan view and the upper eyelid 2 has a circular shape in plan view. The shape can be changed as appropriate. For example, it is possible to make the lower eyelid 1 in a circular shape in plan view and the upper eyelid 2 in a rectangular shape in plan view, or make the lower eyelid 1 and the upper eyelid 2 in a circular shape in plan view or a rectangular shape in plan view, respectively. It is also possible, or the lower eyelid 1 and the upper eyelid 2 can have other shapes.

  Moreover, in the first to third embodiments described above, the through hole 21 communicating with the hollow portion 30 is formed in the upper collar 2, but in the present invention, the through hole 21 is formed in the lower collar 1. Or the through-hole 21 may be formed in the lower collar 1 and the upper collar 2, respectively. Furthermore, this invention can also be set as the structure by which the through-hole 21 is not formed in the lower collar 1 or the upper collar 2.

  In the first to third embodiments described above, the support structure interposed between the bridge pier 4 and the main girder 5 has been described, but the present invention is not limited to this, and the support structure. The installation location of can be changed as appropriate. For example, it can be used as a support structure for supporting a building, or can be used as a support structure for supporting a machine.

  In the first to third embodiments described above, the lower gutter 1 is disposed directly on the pier 4, and the main girder 5 is supported on the upper gutter 2 via the sole plate 8. However, in the present invention, the lower rod 1 may be disposed on the pier 4 via an intermediate member such as a plate, and the upper rod 2 may directly support the main beam 5.

  Further, in the above-described embodiment, the internal thread-shaped through-hole 21 is formed in the upper collar 2, and this through-hole 21 is closed by screwing a bolt-shaped plug body 23. According to the present invention, a cooled plug body is fitted inside the through hole formed in the upper collar 2, and the plug body expands due to a temperature rise so as to be in close contact with the inner peripheral surface of the through hole (cooling process). It is also possible to close the through hole by tightening. Thereby, intrusion of moisture from the through hole can be prevented, screwing work can be omitted, and labor of closing the through hole can be reduced. In this case, it is preferable that the through hole is not formed with irregularities such as threads on the inner peripheral surface, and the inner peripheral surface is formed in a smooth round hole shape, and the plug body is also threaded on the outer peripheral surface. It is preferable that unevenness such as a mountain is not formed, and a cylindrical shape corresponding to the shape of the through hole is formed. Thereby, the sealing performance of the through-hole by the plug can be improved, and moisture can be reliably prevented from entering.

  In addition, in the range which does not deviate from the main point of this invention, it is possible to replace suitably the component in above-mentioned embodiment with a well-known component, and you may combine the above-mentioned modification suitably.

It is a top view of the fixed support structure for demonstrating the 1st Embodiment of this invention. FIG. 2 is a half sectional view of a fixed support structure for explaining the first embodiment of the present invention. It is the elements on larger scale of the upper eyelid for demonstrating the 1st Embodiment of this invention. (A) is sectional drawing which represented typically the bearing structure before a vertical load was applied, (b) is sectional drawing which represented typically the bearing structure after a vertical load was applied. It is sectional drawing which represented typically the movable support structure for demonstrating the 2nd Embodiment of this invention. It is a top view of the movable support structure for demonstrating the 2nd Embodiment of this invention. It is a half sectional view of a movable support structure for explaining a second embodiment of the present invention. It is sectional drawing which represented typically the support structure for demonstrating the 3rd Embodiment of this invention. It is sectional drawing which represented typically the support structure for demonstrating the 4th Embodiment of this invention. FIG. 10 is a plan sectional view taken along the line AA in FIG. 9. It is sectional drawing which represented typically the support structure for describing other embodiment of this invention.

Explanation of symbols

1 Lower ridge 2 Upper ridge 3 Elastic body 4 Bridge pier (under structure)
5 Main girder (superstructure)
11, 111 Inner tube (projection)
20 Outer cylinder part (cylinder part)
21 Through hole 22 Sliding plate (sliding material)
23 Plug body 30, 130 Hollow part

Claims (11)

A support structure comprising: a lower collar disposed on the lower structure; an upper collar disposed above the lower collar and supporting the upper structure; and an elastic body interposed between the lower collar and the upper collar. In
A support structure in which a hollow portion is formed in the elastic body. The bearing structure according to claim 1,
A cylindrical portion projects from the upper surface of the lower collar and / or the lower surface of the upper collar,
A support structure in which the elastic body is accommodated inside the cylindrical portion. In the support structure according to claim 1 or 2,
Either one of the upper surface of the lower collar and the lower surface of the upper collar is provided with a cylindrical portion,
A support structure characterized in that a protruding portion disposed on the outer side or the inner side of the cylindrical portion protrudes from either the upper surface of the lower rod or the lower surface of the upper rod. In the bearing structure according to claim 3,
The projecting portion has an outer diameter smaller than the inner diameter of the cylindrical portion, and has a convex shape in a vertical sectional view fitted inside the cylindrical portion,
The support structure, wherein the elastic body is interposed between at least one of the upper surface of the lower rod and the lower surface of the upper rod and the tip end surface of the protruding portion. In the support structure according to claim 3 or 4,
An elastic structure is interposed between the cylindrical portion and the protruding portion. In the support structure as described in any one of Claim 1 to 5,
On the lower surface of the lower collar and / or the upper surface of the upper collar, a slip material is provided for relatively displacing the lower collar and the lower structure and / or the upper collar and the upper structure in the horizontal direction. The bearing structure is characterized by that. In the support structure as described in any one of Claim 1 to 6,
The said hollow part has penetrated the said elastic body to the up-down direction, The support structure characterized by the above-mentioned. In the support structure as described in any one of Claim 1 to 6,
The hollow structure is a non-through bottomed hole. The support structure according to any one of claims 1 to 8,
A supporting structure in which a through hole communicating with the hollow portion is formed in the lower collar and / or the upper collar. The bearing structure according to claim 9,
The support structure is characterized in that the through hole is closed with a plug. In the support structure as described in any one of Claim 1 to 10,
The support structure according to claim 1, wherein the elastic body is bonded to the upper surface of the lower collar and the lower surface of the upper collar.

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