JP4021558B2 - Elastic bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an elastic bearing device that elastically supports a bridge girder on a pier in a bridge such as a road bridge and a railway bridge.
[0002]
[Prior art]
In bridges and the like, an elastic bearing device capable of absorbing expansion and contraction in the bridge axis direction (traffic direction) of the bridge girder due to temperature change is used as a bearing device that supports the bridge girder on the pier. In general, this elastic bearing device has a rubber elastic body interposed between a lower rod fixed to a bridge pier and an upper rod fixed to a bridge girder, and the bridge girder is expanded and contracted by the elastic displacement of the rubber elastic body in the horizontal direction. It is configured to absorb.
[0003]
When constructing a bridge using the elastic bearing device, a rubber elastic body due to a change in the length of the bridge girder, such as creepage and drying shrinkage of a concrete bridge such as RC or PC, or expansion and contraction caused by a temperature change in a steel bridge, etc. In consideration of the shear deformation of the (rubber bearing body), a temporary fixing method is applied in which the elastic elastic body is subjected to a shear deformation in the reverse direction before shipment and is carried to the site while being held in that state and assembled. Yes. This temporary fixing method restricts (relatively fixes) the relative position of the upper collar and the lower collar in a state where the rubber elastic body is sandwiched therebetween, thereby preliminarily adjusting the rubber elastic body in a predetermined lateral direction ( This is performed using a temporary fixing jig that gives a shear displacement.
[0004]
[Problems to be solved by the invention]
However, in the conventional temporary fixing method, since the temporary fixing member is screwed with a bolt or the like and a fixing jig is used to connect the upper collar and the lower collar with a turn buckle, the number of parts is reduced. In many cases, the removal work becomes large because a jack is used when removing the jig, and it takes time and effort to cut the jig tap on the lower arm, etc., and the bolts etc. jump out in the horizontal direction. There are problems to be solved, such as difficult management and requiring a large space for temporary fixing.
[0005]
The present invention has been made in view of such a technical problem, and an object of the present invention is to provide a rubber elastic body as a support body by a simple operation with only a small number of parts and adjusting the screwing amount of a bolt. The amount of displacement in the direction of the bridge axis can be adjusted. Temporary fixing can be removed with a simple operation of just loosening the bolt, and it can be maintained in the adjusted state as it is. An object of the present invention is to provide an elastic bearing device such as a bridge that does not require processing and can share a jig.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention can absorb the expansion and contraction of the bridge girder by interposing a rubber elastic body between the lower gutter fixed to the bridge pier and the upper gutter fixed to the bridge girder. In the elastic bearing device, each of the upper and lower rods is provided with a slide surface formed with end surfaces facing each other at a predetermined interval in the bridge axis direction and at least one of which is inclined in the vertical direction. the and movable vertically along the slide surface by interposing a vertical slope member having a through hole formed in, is arranged in the bolt and the bolt insertion direction opposite to be inserted into the through hole of the slope member concluded between the slide surface of the slope member by the female screw member, adjusting the bridge axis direction of the relative position of the upper shoe and the lower shoe by screwing degree of the bolt with respect to the female screw member More, and adjusting the amount of elastic displacement of bridge axis direction of the rubber elastic body.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view illustrating a bridge using an elastic bearing device according to the present invention, and FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. 1 and 2, a bridge girder 2 is supported by bridge piers 1 installed at predetermined intervals in the bridge axis direction (passing direction, length direction). Each bridge girder 2 is supported (supported) on the bridge pier 1 via elastic support devices 3 at both ends in the bridge axial direction. Moreover, the bridge girder 2 is supported by the both ends (hence, two places) of each pier 1 in the width direction, as shown in FIG. The bridge shown in FIGS. 1 and 2 can be widely used for bridges such as automobiles and railways, elevated roads, and pedestrian bridges. FIGS. 1 and 2 show the case where the left and right portions of each bridge girder 2 in the axial direction of the bridge are supported by one (four in total) elastic bearing device 3. It goes without saying that the number and arrangement can be implemented in various other modes. Each elastic bearing device 3 can absorb the expansion and contraction of the bridge girder 2 in the direction of the bridge axis by interposing a rubber elastic body 6 between the lower rod 4 fixed to the pier 1 and the upper rod 5 fixed to the bridge girder 2. It is configured as follows.
[0008]
3 is a perspective view showing an embodiment of the elastic bearing device 3 to which the present invention is applied, FIG. 4 is a plan view of the elastic bearing device 3 of FIG. 3, and FIG. 5 is a line 5-5 in FIG. 6 is a partial cross-sectional side view of the elastic bearing device 3 as viewed from above, FIG. 6 is a cross-sectional view in the direction of the bridge axis along line 6-6 in FIG. 4, and FIG. 7 is a line 7-7 in FIG. It is sectional drawing of a direction at right angles to the bridge axis along. 3 to 7, the elastic support device 3 is implanted on the lower surface of both sides of the lower girder 4 and the bridge girder 2 fixed on the pier 1 by a stud bolt (not shown) and a nut (not shown). (Not shown) and a support body comprising an upper collar 5 fixed by a nut (not shown) and the like and a rubber elastic body 6 positioned and mounted in an engaged state between the upper and lower collars 4 and 5 are provided. . The rubber elastic body 6 of the present embodiment has a rectangular parallelepiped shape whose side faces are arranged in parallel to the bridge axis, and as shown in FIGS. 6 and 7, rectangular protrusions formed on the lower surface and the upper surface thereof. 7 and 8 are positioned and mounted by fitting (engaging) square recesses (holes) 9 and 10 formed on the upper surface of the lower collar 4 and the lower surface of the upper collar 5.
[0009]
3 to 5, the elastic displacement amount of the rubber elastic body 6 in the bridge axis direction is adjusted on both sides of the rubber elastic body 6 in each elastic support device 3 (on both sides in the bridge width direction when assembled to the bridge). Temporary fixing jigs 11 and 11 that can be (regulated) and held in the adjusted state (regulated state) are provided. These temporary fixing jigs 11, 11 are mounted using spaces formed by square notches 12, 12 formed on both sides of the upper gutter 5 fixed to the bridge girder 2. That is, side blocks 13 and 13 projecting into the notches 12 and 12 are integrally provided on both sides of the upper surface of the lower pier 4 fixed to the pier 1 (integrated molding or fixed by bolts or welding, etc.). 13 and 13 and the both sides of the upper collar 5 are mounted. Note that the temporary fixing jigs 11 on both sides have a structure that is substantially symmetrical with respect to the center line of the elastic bearing device 3, and the following description on the temporary fixing jig 11 is provided unless otherwise specified. The temporary fixing jigs 11 and 11 are common.
[0010]
The detailed structure of each temporary fixing jig 11 is as follows. 3 to 5, a bridge axis direction (rear end face) is formed by the front end face (front end face) of the protrusion 14 formed on the upper front surface of the side block 13 and the front end face (rear end face) of the protrusion 15 formed on the upper collar 5. Sliding surfaces 16 and 17 that face each other at a predetermined interval in the front-rear direction) are formed. In this embodiment, both the front and rear slide surfaces 16 and 17 are formed of end surfaces that are inclined in the vertical direction so that the upper portion is narrowed. A slope member (wedge member) 18 having an inclined surface at substantially the same angle as the slide surfaces 16 and 17 between the protrusions 14 and 15 and movable in the vertical direction along the slide surfaces 16 and 17. Is intervened. The slope member 18 is formed with a vertical through-hole for inserting the bolt 19. In the illustrated embodiment, the bolt 19 is inserted upward from below. The inclination angle of the slide surfaces 16 and 17 formed by the end surfaces inclined in the vertical direction is normally selected to be about 45 degrees, and the inclination surface of the inclined member 18 is also selected to be substantially the same as this. It is preferable to do.
[0011]
On the opposite side of the protrusions 14 and 15 in the insertion direction of the bolt 19 (in the illustrated embodiment, on the upper side of the protrusions 14 and 15), a female screw that can be screw-engaged with the bolt 19 is formed. A member 20 is arranged. In the illustrated embodiment, the female screw member 20 is formed by welding a welding nut 21 to a plate-like member having an opening. Accordingly, the bolt 19 inserted from the lower side into the through hole of the slope member 18 is screw-engaged with the female screw member 20, and the bolt 19 is screwed in so that the slope member 18 of the slide surfaces 14, 15 is engaged. Can be fastened between. The distance between the slide surfaces 16 and 17 can be adjusted according to the degree of screwing of the bolt 19 into the female screw member 20. That is, the elastic displacement amount of the rubber elastic body 6 in the bridge axis direction can be adjusted by adjusting the relative position of the lower rod 4 and the upper rod 5 in the bridge axis direction according to the screwing degree of the bolt 19. .
[0012]
In the illustrated embodiment, when the bolt 19 is loosened (when the pressing force between the slope member 18 and the slide surfaces 16 and 17 is eliminated), the amount of shear deformation of the rubber elastic body 6 decreases, and the bridge girder 2 is reduced. Follows contraction and extension of As the bolt 19 is screwed in, and the degree of screwing is increased to increase the pressing force with the slide surfaces 16 and 17 , the rightward displacement in FIG. The elastic displacement amount (shear displacement amount) of the elastic body 6 in the bridge axis direction increases. The elastic displacement amount can be increased until the upper surface of the slope member 18 contacts the lower surface of the female screw member 20. 5 and 6, the solid line indicates a state in which the amount of displacement of the rubber elastic body 6 in the bridge axis direction is zero (the bolt 19 is loosened), and the two-dot chain line indicates that the rubber elastic body 6 is elastic in the bridge axis direction. The displaced state (the state in which the bolt 19 is screwed) is shown. If necessary, a lock nut for fixing the bolt 19 at a predetermined screwing position may be used. However, normally, the lock nut is unnecessary because a large tension acts on the screwed bolt 19.
[0013]
FIG. 8 is a side cross-sectional view showing a state of the temporary fixing jig 11 when the bolt 19 is loosened or screwed halfway, and FIG. 9 is a plan view seen from a line 9-9 in FIG. FIG. 10 is a side sectional view showing a state of the temporary fixing jig 11 when the bolt 19 is completely screwed to maximize the amount of displacement of the rubber elastic body 6, and FIG. 11 is a plan view seen from FIG. In this embodiment, a guide groove 22 is formed on the upper surface of the projecting portion 14 on the lower collar 4 side (side block 13 side), and the female screw member 20 has a protrusion 23 formed at one end thereof as a guide groove. 22 is slidably fitted to 22 (rotation is prevented and hardly moves in the direction crossing the bridge axis), and is mounted so that it can freely move (slide) in the bridge axis direction. Yes. If necessary, the guide groove 22 is formed from the tip of the projecting portion 14 to a short distance before the bolt 19 is screwed, and before the inclined member 18 contacts the female screw member 20, the female screw member is formed. The maximum projecting amount of the bolt 19, and hence the maximum displacement amount of the rubber elastic body 6, may be regulated by the 20 projecting portions coming into contact (abutting) with the end face of the guide groove 22.
[0014]
According to the embodiment described above, the elastic elastic body 6 is interposed between the lower rod 4 fixed to the bridge pier 1 and the upper rod 5 fixed to the bridge beam 2 to absorb the expansion and contraction of the bridge beam 2. In the elastic bearing device 3 configured to be capable of sliding, a slide surface 17 formed of end surfaces that face each other at a predetermined interval in the bridge shaft direction and at least one of which is inclined in the vertical direction, to each of the upper rod 5 and the lower rod 4. 16, a slope member 18 that is movable between the slide surfaces in the vertical direction and formed with a through hole in the vertical direction is interposed between the slide surfaces, and a bolt 19 inserted through the through hole. And the female screw member 20 disposed on the opposite side of the bolt insertion direction, the slope member 18 can be fastened between the slide surfaces 16 and 17, and the bolt 19 is screwed into the female screw member 20. Since the elastic displacement amount of the rubber elastic body 6 in the direction of the bridge axis is adjusted by fitting, the rubber elasticity as a support body can be obtained by a simple operation with only a small number of parts and adjusting the screwing amount of the bolt 19. The amount of displacement of the body 6 in the direction of the bridge axis can be adjusted. Temporary fixing can be removed by a simple operation of simply loosening the bolt 19, and can also be maintained in the adjusted state. In addition, there is an effect that the jig 11 can be shared without requiring extra processing.
[0015]
FIG. 12 is a side sectional view showing a state in which the bolt 19 is loosened or screwed halfway in another embodiment of the temporary fixing jig 11 used in the elastic bearing device to which the present invention is applied, and FIG. FIG. 14 is a plan view seen from line 13-13 in FIG. 12, and FIG. 14 shows a state when the bolt 19 is completely screwed in the temporary fixing jig 11 of FIG. FIG. 15 is a side sectional view, and FIG. 15 is a plan view as seen from line 15-15 in FIG.
[0016]
In the embodiment shown in FIGS. 12 to 15, the slope member 18 is inclined only on one side (in the example shown, it is on the protruding portion 15 side of the upper collar 5, but may be on the protruding portion 14 side of the lower collar 4). A member having a vertical surface is used on the opposite side, and therefore, the front end surface (sliding surface) 16 of the protrusion 14 on the side block 13 side is also a vertical surface, and the female screw member 20 As the member, a member integrally fixed to the protrusion 14 on the vertical slide surface 16 side of the protrusions 14 and 15 by welding or the like is used. The present embodiment is different from the above-described embodiment shown in FIGS. 3 to 11 in these points, and the other parts have substantially the same configuration as the above-described embodiment, and detailed description thereof will be omitted. . Also in this embodiment, the inclination angle of the slide surface 17 formed by the end surface inclined in the vertical direction is normally selected to be about 45 degrees, and the corresponding inclined surface of the inclined member 18 is substantially the same. It is preferable to select the same inclination angle.
[0017]
According to the embodiment of FIGS. 12 to 15, in addition to obtaining the same function and effect as the embodiment of FIGS. 3 to 11, one side of the slope member 18 (whichever side) may be a vertical plane, Since the female screw member 20 is fixed (integrated) to the projecting portion 14 having the vertical slide surface 16 corresponding to the vertical surface, a mechanism for preventing the rotation of the female screw member 20 (the guide in the above-described embodiment). The grooves 22 and the protrusions 23) are not necessary, and the effect that the number of processing steps can be reduced accordingly.
[0018]
In addition, as the rubber elastic body 6 in the above-mentioned embodiments, in addition to a rubber body only from rubber, a laminated rubber body in which a rubber layer and a reinforcing plate are alternately laminated and integrated, and reinforcing materials such as various fibers are integrated. As long as it is a rubber elastic body that can constitute a support body that can be elastically displaced in the horizontal direction, such as a reinforced rubber body, an arbitrary structure can be used. Moreover, the shape can also be made into various shapes, such as a square shape, a polygonal shape, and a circular shape. Furthermore, the structure of the connecting portion between the rubber elastic body 6 and the lower collar 4 and the upper collar 5 is not limited to fitting, and an arbitrary coupling structure such as adhesion, vulcanization adhesion, or bolt fastening is adopted depending on circumstances. be able to.
[0019]
In the embodiment described above, the temporary fixing jigs 11 are provided on both sides of the elastic bearing device 3. However, the temporary fixing jigs 11 may be provided on only one side of the elastic bearing device 3. 16, FIG. 17 and FIG. 18 are diagrams showing an embodiment of the elastic bearing device 3 provided with the temporary fixing jig 11 only on one side, FIG. 16 is a perspective view corresponding to FIG. 3, and FIG. 4 is a plan view corresponding to FIG. 4, and FIG. 18 is a cross-sectional view in a direction perpendicular to the bridge axis along line 18-18 in FIG. The position of the temporary fixing jig 11 when it is provided only on one side may be either outside or inside in a direction perpendicular to the bridge axis direction of the elastic bearing device 3. The same applies to the temporary fixing jig using the slope member having the vertical surface described with reference to FIGS. 12 to 15, and may be provided only on the outer side, the outer side, or the inner side of the elastic bearing device 3. Good. 16 to 18, portions corresponding to the respective portions in FIGS. 1 to 15 are denoted by the same reference numerals, and detailed description thereof is omitted. The same effect as in the case of FIGS. 1 to 15 can also be obtained by the elastic bearing device having the temporary fixing jig 11 arranged on one side as shown in FIGS.
[0020]
【The invention's effect】
As is apparent from the above description, according to the present invention, it is possible to absorb the expansion and contraction of the bridge girder by interposing a rubber elastic body between the lower gutter fixed to the bridge pier and the upper gutter fixed to the bridge girder. In the above-described elastic bearing device, each of the upper rod and the lower rod is provided with a slide surface that is opposed to each other at a predetermined interval in the bridge axis direction and at least one of which is inclined in the vertical direction. A slope member that is movable in the vertical direction along the slide surface and formed with a through hole in the vertical direction is interposed between the surfaces , and the bolt inserted through the through hole of the slope member and the bolt insertion direction opposite side the slope member concluded between the slide surface by a female screw member disposed, the bridge axis direction of the relative position of the upper shoe and the lower shoe by screwing degree of the bolt with respect to the female screw member By integer, and adjusting the amount of elastic displacement of bridge axis direction of the rubber elastic body.
[Brief description of the drawings]
FIG. 1 is a schematic side view illustrating a bridge using an elastic bearing device according to the present invention.
FIG. 2 is a sectional view taken along line 2-2 in FIG.
FIG. 3 is a perspective view showing an embodiment of an elastic bearing device to which the present invention is applied.
4 is a plan view of the elastic bearing device of FIG. 3. FIG.
5 is a partial cross-sectional side view of the elastic bearing device taken along line 5-5 in FIG.
6 is a cross-sectional view in a bridge axis direction along line 6-6 in FIG. 4;
7 is a cross-sectional view in a direction perpendicular to the bridge axis taken along line 7-7 in FIG. 4;
8 is a side cross-sectional view showing a state in which the bolt is loosened or screwed halfway in the temporary fixing jig in FIG. 3. FIG.
FIG. 9 is a plan view taken from line 9-9 in FIG.
10 is a side cross-sectional view showing a state in which the displacement amount of the rubber elastic body is maximized by completely screwing the bolt in the temporary fixing jig in FIG. 3;
11 is a plan view seen from line 11-11 in FIG.
FIG. 12 is a side cross-sectional view showing a state where a bolt is loosened or screwed halfway in another embodiment of a temporary fixing jig used in an elastic bearing device to which the present invention is applied.
13 is a plan view seen from line 13-13 in FIG. 12. FIG.
14 is a side cross-sectional view showing a state where the bolt is completely screwed in the temporary fixing jig of FIG. 12 to maximize the amount of displacement of the rubber elastic body. FIG.
15 is a plan view seen from line 15-15 in FIG.
FIG. 16 is a perspective view showing an embodiment of the elastic bearing device to which the present invention is applied and having a temporary fixing jig only on one side.
17 is a plan view of the elastic bearing device of FIG. 16;
18 is a cross-sectional view in a direction perpendicular to the bridge axis along line 18-18 in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bridge pier 2 Bridge girder 3 Elastic support apparatus 4 Lower rod 5 Upper rod 6 Rubber elastic body 11 Temporary fixing jig 13 Side block 14 Protrusion 15 Protrusion 16 Slide surface 17 Slide surface 18 Slope member (Wedge member)
19 Bolt 20 Female thread member 21 Nut 22 Guide groove 23 Projection

Claims (2)

In an elastic bearing device in which a rubber elastic body is interposed between a lower bridge fixed to a bridge pier and an upper bridge fixed to a bridge girder so that the expansion and contraction of the bridge girder can be absorbed,
Provided with each of the upper heel and the lower heel is a slide surface formed by end faces facing each other at a predetermined interval in the bridge axis direction and at least one inclined in the vertical direction,
Between these slide surfaces, interposing a slope member that is movable in the vertical direction along the slide surface and in which a vertical through hole is formed ,
The slope member concluded between the slide surface by a female screw member disposed on the bolt and the bolt insertion direction opposite to be inserted into the through hole of the slope member,
The elastic displacement amount of the rubber elastic body in the bridge axis direction is adjusted by adjusting the relative position in the bridge axis direction of the lower rod and the upper rod according to the screwing degree of the bolt with respect to the female screw member. Elastic bearing device.     2. The elastic bearing device according to claim 1, wherein an inclination angle of a slide surface formed by the end surface inclined in the vertical direction is about 45 degrees.

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