JPH09203010A - Bearing device for bridge girder and execution method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent the possibility of the fall of a bridge girder even when an earthquake occurs in case the bridge girder is constructed and to provide technology capable of fixing a bearing device at an early time. SOLUTION: This bearing device is provided between a bridge girder 1 and a lower structure 2, and a rubber bearing 3 for permitting a bridge axial relative displacement of the bridge girder against the lower structure is contained. Then, the bearing device is equipped with base plate 4 fixed on the lower structure, a plate-like lower shoe stone 5 mounted on the base plate, a plate-like upper shoe stone 6 fixed to the lower surface of the bridge girder, a rubber bearing 3 having a rubber layer 7 provided between the upper shoe stone and lower shoe stone, joint device constraining relative sliding movement between the upper surface of the rubber bearing and upper shoe stone and the lower surface of the rubber bearing and lower shoe stone, and a plurality of temporary fixing members 10 arranged to the circumferential edge of the lower shoe stone for limiting the sliding movement of the lower shoe stone against the base plate 4, and the temporary fixing members provide elastic members 11 to parts brought into contact with the lower shoe stone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing provided between a bridge girder and a lower structure supporting the bridge girder and including a rubber bearing for allowing relative displacement of the bridge girder in the bridge axial direction with respect to the lower structure. It relates to the equipment and its construction technology.

[0002]

2. Description of the Related Art For example, when constructing a steel or concrete bridge girder, a supporting device is arranged between the bridge girder and a substructure supporting the bridge girder. The support device includes a rubber support, and the rubber support has a function of integrally connecting the bridge girder and the lower structure in a form that allows the bridge girder itself to expand and contract due to temperature change. In addition, as another function, it also exerts an action of absorbing the vibration generated by an earthquake or the like by the rubber bearing and relieving the partial concentration of stress.

In the construction of such a bridge girder with a bearing device, a so-called pre-slide system is often adopted in which the rubber layer in the rubber bearing is slid and installed while preventing shear deformation. The advantages of using this method are that the rubber bearing can be protected when the bearing device is installed, and that the bridge girder can be constructed even in an environment where the expansion / contraction state of the bridge girder is not near the standard temperature. Here, the standard temperature means a temperature at which the expansion / contraction amount of the bridge girder based on the expected temperature change is near its average.

[0004]

By the way, when constructing such a bridge girder with a supporting device, it is necessary to take measures to prevent the bridge girder from falling due to an earthquake or the like occurring during the construction. However, in the conventional pre-slide construction, the shear deformation of the rubber layer was prevented during the construction, and the entire rubber bearing was constrained by the anti-shear metal fittings, so an earthquake occurred during construction. In this case, the vibration absorbing function of the rubber bearing does not work, and as a result, the bridge girder may drop.

On the other hand, in consideration of the possibility that an earthquake will occur during construction, it is desirable to fix the bearing device early. However, in order to fix this bearing device early,
The required amount of pre-slide based on the standard temperature of the bridge girder must be adjusted in advance.

The present invention has been made in consideration of the above points, and provides a technique capable of effectively preventing the possibility of the bridge girder falling even if an earthquake occurs during the construction of the bridge girder. With the goal. Another object of the present invention is to provide a technique capable of quickly fixing the bearing device.

[0007]

SUMMARY OF THE INVENTION The gist of the present invention is a rubber provided between a bridge girder and a lower structure supporting the bridge girder to allow relative displacement of the bridge girder in the bridge axial direction with respect to the lower structure. A support device including a support, wherein a base plate fixed on the lower structure, a plate-shaped lower shoe placed on the base plate, a plate-shaped upper shoe fixed on the lower surface of the bridge girder, and the upper shoe and A rubber bearing arranged between the lower shoes, coupling means for restraining relative sliding movement between the upper surface of the rubber bearing and the upper shoe, and between the lower surface of the rubber bearing and the lower shoe, A plurality of temporary fixing members arranged on the periphery of the lower shoe to limit the sliding movement of the lower shoe with respect to the base plate, and these temporary fixing members have an elastic material in a portion in contact with the lower shoe. , In bridge girder support device That. The gist of the invention of claim 2 is
2. The plate-shaped lower shoe has a planar rectangular shape and has notches at four corners thereof, and the temporary fixing members are fixed to the base plate in a form respectively arranged in the notches. It exists in the support device of the bridge girder. The gist of the invention according to claim 3 is to provide a bridge girder support device according to claim 1, wherein a shear prevention mechanism that allows relative displacement in the bridge axial direction within a predetermined range is provided between the upper shoe and the lower shoe. Exist in. The gist of the invention according to claim 4 is that the shearing prevention mechanism includes a recessed portion provided in the upper shoe and a shearing prevention member that is fixed to the lower shoe and part of which is fitted in the recessed portion. It exists in the support device of the bridge girder of 3. The gist of the invention according to claim 5 is that the connecting means comprises recesses respectively provided on the surfaces of the rubber bearing, the upper shoe and the lower shoe, which face each other, and a shear key which is fitted between the recesses. And a bridge girder support device according to claim 1. The gist of claim 6 is as follows.
When arranging a bearing device including a rubber bearing for allowing relative displacement of the bridge girder in the bridge axial direction with respect to the lower structure between the bridge girder and the lower structure supporting the bridge girder, the following A, B, and It exists in the construction method characterized by performing each process of C. A. A base plate is fixed on the lower structure, a lower shoe is placed on the base plate, a rubber bearing including a rubber layer is placed on the lower shoe, and an upper shoe is placed on the rubber bearing. The first step of positioning the upper surface and the upper shoe and the lower surface of the rubber bearing and the lower shoe by the coupling means. B A shearing prevention mechanism that attaches a shearing prevention member that fits into a recess provided in the upper shoe to the lower shoe and allows relative displacement in the bridge axial direction between the upper shoe and the lower shoe within a predetermined range. The second step of configuring. C A third step of elastically fixing the sliding movement of the lower shoe by attaching a plurality of temporary fixing members to the base plate, which are in contact with the peripheral edge of the lower shoe via an elastic material. The gist of the invention according to claim 7 is that, after fixing the support device to the bridge girder, the lower bar is relatively displaced in the bridge axial direction by using power with respect to the base plate, so that a rubber layer of the rubber support and The construction method according to claim 6, wherein the support device is fixed while the elastic material of the temporary fixing member is deformed. The gist of the invention according to claim 8 resides in the construction method according to claim 7, wherein the relative displacement amount between the bridge girder and the base plate is the expansion / contraction amount of the bridge girder based on the standard temperature. Claim 9
The gist of the described invention is to fix the supporting device by loading a fixing spacer in a gap between the shear preventing member and the recess to restrain relative displacement in the bridge axis direction between the upper shoe and the lower shoe. The present invention resides in the construction method according to claim 7 or 8. The gist of the invention according to claim 10 is that, as the power, a jack arranged between the bridge girder and the base plate is used, and a concave groove for fitting with an edge portion of the base plate is provided on one end side of the jack. Claim 7
It depends on the construction method. The power in the present invention means
Includes those suitable for practicing the invention, such as hydraulic jacks. In that case, as the jack, one that can be arranged between the bridge girder and the base plate is used, and the one end of the jack is provided with a concave groove to be fitted to the edge portion of the base plate to stabilize the jack. Therefore, it is preferable to consider the position.

[0008] As described above, since the step of fixing the supporting device by displacing the lower rod relative to the base plate in the bridge axial direction by using the power is adopted, the necessary pre-slide based on the standard temperature of the bridge girder is adopted. The amount can be adjusted in advance irrespective of the temperature at the time of construction, so that the bearing device can be fixed quickly. Here, the support device can be fixed by loading a fixing spacer in the gap between the shear prevention member and the recess and restraining the relative displacement of the upper and lower shoes in the bridge axis direction. . Then, it becomes possible to omit the welding work for fixing the bearing device.

[0009]

1 is an exploded perspective view showing a bearing device according to the present invention, FIG. 2 is a partial sectional side view showing an installed state, FIG. 3 is a plan view of a lower shoe, and FIG. 6A and 6B are a plan view and a side view of the temporary fixing member, FIG. 5 is a perspective view showing a construction procedure, and FIG. 6 is a flow chart showing a construction procedure.

As can be understood from these figures, the supporting device S is composed of a substructure 2 such as a pier for supporting the bridge girder 1.
The base plate 4 is fixed on the base plate 4
Place the lower shoe 5 on top, and the plate-shaped upper shoe 6 on the lower surface of the bridge girder 1.
Is fixed, and a rubber bearing 3 having a rubber layer 7 is arranged between the upper shoe 6 and the lower shoe 5. The base plate 4 has a plurality of anchor bolts 1 for the lower structure 2.
It is fixed by 6. The base plate 4 has a rectangular shape in a plane and is formed larger than the lower shoe 5.

The lower shoe 6 is also rectangular in a plane, but has notches 12 at its four corners. The lower shoe 5 is elastically fixed to the base plate 4 by four temporary fixing members 10. That is, each temporary fixing member 10 fits into the notch 12 while being fixed to the four corners of the base plate 4 by the bolts 17. The temporary fixing member 10 itself is made of a flat trapezoidal metal plate, and elastic members 11 are integrally provided on the two sides corresponding to the L-shaped inner surface of the notch 12 (the peripheral edge of the lower shoe 5), and the elasticity of the elastic member 11 is increased. The material 11 is in contact with the peripheral edge of the lower shoe 5. This allows the lower shoe 5 to be elastically fixed and restrained so that the lower shoe 5 can be slightly slid with respect to the base plate 4.

The rubber bearing 3 has a structure in which metal plates are integrally provided above and below the rubber layer 7. Therefore, the portion of the rubber layer 7 can be sheared and deformed. The upper surface of the rubber bearing 3 and the upper shoe 6
And between the lower surface of the rubber bearing 3 and the lower shoe 5,
Coupling means is provided to restrain relative sliding movement. This coupling means is composed of recesses 8 and 8 respectively provided on the surfaces of the rubber bearing 3 and the upper shoe 6 and the lower shoe 5 which face each other, and a shear key 9 which is fitted between the facing recesses. It is configured. In the illustrated example, the means for connecting the upper surface of the rubber bearing 3 to the upper shoe 6 is composed of one shear key 9 and two recesses 8 and 8 facing each other, and the lower surface of the rubber bearing 3 is joined to the lower shoe 5. The means is composed of a pair of shear keys 9 arranged at intervals in a direction orthogonal to the bridge axis direction, and two pairs of facing recesses 8.

The upper shoe 6 has a substantially rectangular plate shape and is fixed to the lower surface plate 1a of the bridge girder 1 using a plurality of bolts 20. A shear prevention mechanism is provided between the upper shoe 6 and the lower shoe 5 to allow relative displacement in the bridge axial direction within a predetermined range. This shearing prevention mechanism includes a recess 13 provided on each of the two sides of the upper shoe 6 extending in the bridge axis direction, a shearing prevention member 14 fixed to the lower shoe 5, a part of which is fitted in the depression 13, and a pressing plate. 18 and. The pressure plate 18 is
It is fixed to the upper surface of the shear prevention member 14 by the bolt 19. The pressing plate 18 is formed in a rectangular shape wider than the shearing prevention member 14, and a part of the lower surface thereof is set so as to be located on the surface of the recess 13 (the surface of the upper shoe 6). As a result, the upper shoe 6 and the lower shoe 5 can move relative to each other only in the bridge axis direction, and are designed so as not to be separated vertically. A pair of left and right shear prevention mechanisms are provided on both sides in the bridge axis direction. In FIG. 5, reference numeral 21 is a center hole jack, and one end of the center hole jack 21 is provided with a recessed groove 21a having a size such that the edges of the base plate 4 and the temporary fixing member 10 can be fitted simultaneously. As a result, one end of the jack 21 is designed to be supported in a stable state with respect to the base plate 4 and at the same time to be able to transmit force to the temporary fixing member 10.

In the installation of the support device S, as shown in the flow chart of FIG. 6, first, the lower structure 1
The base plate 4 integrated with the anchor bolt 16 is fixed and set thereon. Next, the lower shoe 5 is placed on the base plate 4, the rubber bearing 3 including the rubber layer 7 is placed on the lower shoe 5, the upper shoe 6 is placed on the rubber bearing 3, and the rubber bearings 3 are The upper surface and the upper shoe 6, and the lower surface of the rubber bearing 3 and the lower shoe 5 are positioned by a coupling means having a shear key 9, and the upper shoe 6 is fixed to the bridge girder 1 with a bolt 20 to set the bearing device S. . At this time, lower shoe 5
On the other hand, a shearing prevention member 14 that fits into the recess 13 of the upper shoe 6 is attached, and a pressing plate 18 is attached to the upper surface of the shearing prevention member 14 with a bolt 19, and the fixed spacer 1
A shear preventing mechanism for preventing relative displacement in the bridge axis direction between the upper shoe 6 and the lower shoe 5 by setting 5 is configured in advance.

Next, the bolt 1 is attached to the base plate 4.
By attaching the temporary fixing member 10 with 7, the lower gear 5
Is elastically fixed so that the sliding movement is slightly possible, whereby the support device S is temporarily fixed. In this state, the rubber layer 7 of the rubber bearing 3 cannot be sheared and deformed by the fixed spacer 15, while the lower shoe 5 is elastically fixed in a slightly slidable state by the elastic member 11 of the temporary fixing member 10. It Therefore, the elastic material 11 can effectively absorb the seismic force during construction.

Next, the amount of pre-slide is calculated and it is determined whether or not the adjustment to the standard temperature is performed. If this is not necessary, the support device S is permanently fixed. Here, when it is necessary to adjust, as shown in FIG. 5, for example, a center hole jack 21 is used, and the recessed groove 21a portion of the jack 21 is fitted into the base plate 4 and the edge of the temporary fixing member 10, respectively. Position the bridge girders 1
The (lower rod 5) is relatively displaced in the bridge axis direction with respect to the base plate 4, and the rubber layer 7 and the temporary fixing member 10 of the rubber bearing 3 are moved.
The support device S is fixed in a state in which the elastic member 11 is deformed. At this time, if welding is possible, the lower shoe 5 and the base plate 4 are welded and fixed. At that time, the fixed spacer 1
5 is removed. On the other hand, if welding is not possible, the main fixing member manufactured based on the pre-slide amount and the adjustment amount up to the standard temperature is used for fixing.

[0017]

As described above, according to the present invention, the function of the rubber bearing is made to work even at the time of construction, and the lower shoe is elastically fixed to the base plate by using the temporary fixing member with the elastic material. Since it is fixed, even if an earthquake occurs during the construction of the bridge girder, the risk of the bridge girder falling can be effectively prevented. In addition, by adopting a method in which the bridge girder is relatively displaced in the bridge axial direction using power with respect to the base plate to fix the supporting device, the required pre-slide amount based on the standard temperature of the bridge girder can be set to the temperature during construction. Can be adjusted in advance regardless of the above, which allows the bearing device to be fixed quickly.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a bearing device according to the present invention.

FIG. 2 is a partial cross-sectional side view showing an installed state.

FIG. 3 is a plan view of a lower shoe.

FIG. 4 is a plan view and a side view of a temporary fixing member.

FIG. 5 is a perspective view showing a construction procedure.

FIG. 6 is a flowchart showing a construction procedure.

[Explanation of symbols]

 S support device 1 bridge girder 1a lower surface plate 2 lower structure 3 rubber support 4 base plate 5 lower shoe 6 upper shoe 7 rubber layer 8 recess 9 shear key 10 temporary fixing member 11 elastic material 12 notch 13 recess 14 shear prevention member 15 for fixing Spacer 16 Anchor bolt 17 Bolt 18 Holding plate 19 Bolt 20 Bolt 21 Center hole jack

Claims (10)

[Claims] 1. A bearing device provided between a bridge girder and a lower structure supporting the bridge girder, comprising a rubber bearing for allowing relative displacement of the bridge girder in the bridge axial direction with respect to the lower structure. A base plate fixed on the lower structure,
A plate-shaped lower shoe placed on the base plate, a plate-shaped upper shoe fixed to the lower surface of the bridge girder, a rubber bearing arranged between the upper shoe and the lower shoe, and an upper surface of the rubber bearing and the upper shoe. And a coupling means for restraining relative sliding movement between the lower surface of the rubber bearing and the lower shoe.
A plurality of temporary fixing members arranged on the periphery of the lower shoe to limit the sliding movement of the lower shoe with respect to the base plate, and these temporary fixing members have an elastic material in a portion in contact with the lower shoe. There is a bridge girder support device. 2. The plate-shaped lower shoe has a flat rectangular shape and has notches at four corners thereof, and each of the temporary fixing members includes:
The bridge girder support apparatus according to claim 1, wherein the bridge girder support device is configured to be fixed to the base plate in a form of being arranged in each of the notches. 3. The bridge girder support device according to claim 1, further comprising a shearing prevention mechanism provided between the upper and lower shoes for permitting relative displacement in the bridge axial direction within a predetermined range. 4. The bridge girder support according to claim 3, wherein the shearing prevention mechanism includes a recessed portion provided in the upper shoe and a shearing prevention member fixed to the lower shoe and part of which is fitted in the recessed portion. apparatus. 5. The connecting means comprises recesses respectively provided on the surfaces of the rubber bearing, the upper shoe and the lower shoe, which face each other, and a shear key which is fitted between the recesses. Paragraph 1 support device for bridge girder. 6. When disposing a bearing device including a rubber bearing for allowing relative displacement of the bridge girder in the bridge axial direction with respect to the lower structure between the bridge girder and the lower structure supporting the bridge girder, A construction method characterized by performing each step of A, B, and C. A. A base plate is fixed on the lower structure, a lower shoe is placed on the base plate, a rubber bearing including a rubber layer is placed on the lower shoe, and an upper shoe is placed on the rubber bearing. The first step of positioning the upper surface and the upper shoe and the lower surface of the rubber bearing and the lower shoe by the coupling means. B A shearing prevention mechanism that attaches a shearing prevention member that fits into a recess provided in the upper shoe to the lower shoe and allows relative displacement in the bridge axial direction between the upper shoe and the lower shoe within a predetermined range. The second step of configuring. C A third step of elastically fixing the sliding movement of the lower shoe by attaching a plurality of temporary fixing members to the base plate, which are in contact with the peripheral edge of the lower shoe via an elastic material. 7. After fixing the support device to the bridge girder,
The bearing device is fixed in a state where the rubber layer of the rubber bearing and the elastic material of the temporary fixing member are deformed by relatively displacing the lower bar in the bridge axis direction with power with respect to the base plate. Item 6 construction method. 8. The relative displacement between the bridge girder and the base plate is the expansion / contraction amount of the bridge girder based on standard temperature.
Construction method. 9. The fixing of the supporting device is carried out by loading a fixing spacer in a gap between the shear preventing member and the concave portion, and restraining relative displacement of the upper and lower shoes in the bridge axial direction. The construction method according to claim 7 or 8, which is performed. 10. A jack arranged between the bridge girder and the base plate is used as the power, and a concave groove for fitting with an edge portion of the base plate is provided on one end side of the jack. Construction method.