JP2022187537A - Fixing structure of side block in bridge bearing - Google Patents

Abstract

To provide a fixing structure of a side block of a bridge bearing capable of reducing cost by making the structure compact.SOLUTION: An insertion part 13 of the lower part of the side block is inserted into a hole 12 formed in a lower shoe 54 so that a gap exists between the wall surface of the hole 12 and a wedge 15 is fitted into the gap. Of the wall surface of the hole 12, the first wall surface 12a on the center side of the lower shoe 54 is formed on an inclined surface facing the lower surface of the lower shoe 54, and a second wall surface 12b on the outer peripheral side of the lower shoe 54 is formed on an inclined surface facing the upper surface side of the lower shoe 54, and the front surface of the insertion part 13 of the side block 10 facing the first wall surface 12a is formed on the inclined surface and a gap in which the wedge 15 is fitted between the rear surface facing the second wall 12b.SELECTED DRAWING: Figure 7

Description

The present invention relates to a fixing structure for side blocks in bridge bearings.

BACKGROUND ART As a member that constitutes a bearing of a bridge, there is known a side block that is fixed on a shoe installed on the upper surface of a substructure (see, for example, FIGS. 3 and 4 of Patent Document 1). These side blocks are generally placed on both sides in the direction perpendicular to the bridge axis, sandwiching the bearing body made of laminated rubber or the like that supports the load of the superstructure. It has the function of constraining the displacement of the superstructure and suppressing the upward lift acting on the superstructure.

A conventional side block is formed in an inverted T shape with projections provided on both sides of a prismatic main body, and is fixed to the shoe with bolts attached to the projections. As a result, the side block as a whole becomes large and requires a large amount of processing, which tends to increase the cost. Also, if the bearing to be installed is a fixed bearing, it is necessary to consider the arrangement so that the bolt head does not hit the upper shoe when the side block is attached or detached.

JP 2011-38394 A

The present invention was made based on the above technical background, and achieves the following objects.
SUMMARY OF THE INVENTION An object of the present invention is to provide a structure for fixing side blocks of a bridge bearing, which is compact in structure and reduces costs.

In order to achieve the above object, the present invention employs the following means.
That is, the present invention provides a fixing structure for a side block that is fixed on a shoe installed on the upper surface of a lower structure to restrain displacement of the upper structure,
The insertion part of the lower part of the side block is inserted into the hole formed in the lower shoe so that there is a gap between the insertion part and the wall surface of the hole,
The fixing structure of the side block in the bridge support is characterized in that a wedge is fitted in the gap.

More specifically, the side blocks are provided on both sides of the bearing main body provided on the lower shoe in the direction perpendicular to the bridge axis.
The hole is rectangular in plan view having a pair of wall surfaces parallel to the bridge axis and a pair of wall surfaces parallel to the direction perpendicular to the bridge axis, and the insertion portion of the side block has a rectangular cross section. belongs to.

Of the pair of wall surfaces parallel to the bridge axis direction, the first wall surface on the center side of the lower shoe is formed on an inclined surface facing the lower surface side of the lower shoe, and the second wall surface on the outer peripheral side of the lower shoe is formed on an inclined surface facing the upper surface side of the lower shoe,
The insertion portion of the side block has a front surface facing the first wall surface formed into an inclined surface, and a gap for fitting the wedge is formed between the rear surface facing the second wall surface. be able to.

The wedge may have a flange on the upper end protruding from the hole, and may be fixed to the lower shoe by a bolt attached to the flange. In addition, the side blocks may have stepped portions on both side surfaces parallel to the direction perpendicular to the bridge axis and at boundaries between the insertion portions and upper portions thereof.

According to this invention, the structure of the side block can be made compact, and the cost can be reduced.

FIG. 2 is a diagram showing an example of a bridge bearing on which side blocks are installed, viewed in the direction of the bridge axis; It is a top view of the same bearing. FIG. 4 is a plan view showing a hole of the lower shoe into which the lower insertion portion of the side block is inserted; It is a cross-sectional view of the lower shoe showing the same hole. The side block is shown, (a) is a view seen in the direction of the bridge axis, and (b) is a view seen in the direction perpendicular to the axis. A wedge is shown, (a) is a sectional view seen in the direction of the bridge axis, and (b) is a view seen in the direction perpendicular to the axis. FIG. 4 is a cross-sectional view seen in the bridge axis direction showing a state in which the side block is fixed to the lower shoe; It is the figure which looked at the bridge axis right angle direction which shows the fixed state of the same side block.

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an example of a bridge bearing on which side blocks are installed. FIG. 1 is a view of the bearing viewed in the direction of the bridge axis, and FIG. 2 is a plan view of the bearing. In the figure, X indicates the direction of the bridge axis, and Y indicates the direction perpendicular to the axis.

The bearing 50 includes a lower shoe 54 fixed to the upper surface of the lower structure 51 via a plurality of anchor bolts 53 , an upper shoe 55 fixed to the lower surface of the upper structure 52 , and a bearing arranged on the lower shoe 54 . and a body 56 . The bearing main body 56 is a member serving as a main part of the bearing that supports the load of the upper structure 52 .

The bearing 50 illustrated in the drawing is a high surface pressure bearing, and an elastic load supporting plate using urethane rubber having a high elastic modulus as the bearing main body 56 is shown. When the bearing is a distributed bearing or a seismic isolation bearing, a laminated rubber (rubber shoe) is used as the bearing body.

The bearing 50 illustrated in the drawing is a movable bearing installed in a movable bearing portion of a bridge, and an intermediate plate 57 is provided between an upper shoe 55 and a bearing body 56 . A bearing body 56 is fixed between this intermediate plate 57 and the lower shoe 54 .

A sliding member (not shown) is provided on the upper surface of the intermediate plate 57 and the lower surface of the upper shoe 55 so that sliding occurs between them in the bridge axis direction. Both ends of the intermediate plate 57 in the direction perpendicular to the bridge axis protrude from the lower surface of the upper shoe 55 . Notches 58 are provided at both ends of the intermediate plate 57 .

The side blocks 10, 10 are fixed on the lower shoes 54 on both sides of the support body 56 in the direction Y perpendicular to the bridge axis. The side block 10 engages with the upper shoe 55 during an earthquake to receive its displacement, and transmits the horizontal force acting on the upper structure 52 to the lower structure 51 . In addition, the side block 10 is provided with an overhanging portion 11 directed toward the center of the bearing 50 at the upper end portion. suppress lift.

Furthermore, the side block 10 restrains the notch 58 of the intermediate plate 57 by engaging the notch 58 of the intermediate plate 57 at its middle portion in the height direction, thereby preventing shear deformation of the elastic load support plate 56, which is the bearing main body. The upper shoe 55 is slid against the intermediate plate 57 .

According to the present invention, the side block 10 is fixed by inserting its lower insertion portion into a hole formed in the lower shoe 54 . 3 and 4 show the hole 12 into which the lower insertion portion of the side block 10 is inserted, FIG. 3 being a plan view and FIG. 4 being a sectional view. The hole 12 is rectangular in plan view and has a pair of wall surfaces 12a, 12b parallel to the bridge axis direction X and a pair of wall surfaces 12c, 12c parallel to the bridge axis direction Y. As shown in FIG.

Of the pair of wall surfaces 12a and 12b parallel to the bridge axis direction X, the first wall surface 12a on the center side of the lower shoe 54 is formed as an inclined surface facing the lower surface side of the lower shoe 54. As shown in FIG. Further, the second wall surface 12b on the outer peripheral side of the lower shoe 54 is formed into an inclined surface facing the upper surface side of the lower shoe 54. As shown in FIG.

Here, the angles of inclination of the first and second wall surfaces 12a and 12b, that is, the angles formed by the first and second wall surfaces 12a and 12b with respect to the plane perpendicular to the upper and lower surfaces of the lower shoe 54 are α° and β°, respectively. Then, it is set so as to have a relationship of α°≧β°. The pair of wall surfaces 12 c , 12 c parallel to the direction Y perpendicular to the bridge axis are surfaces perpendicular to the upper and lower surfaces of the lower shoe 54 .

FIG. 5 shows the side block, (a) is a view seen in the direction of the bridge axis, and (b) is a view seen in the direction perpendicular to the axis. The side block 10 has an insertion portion 13 whose lower portion is inserted into the hole 12 of the lower shoe 54, and the entire side block 10 including the insertion portion 13 has a rectangular cross section.

The front surface 13 a of the insertion portion 13 facing the center side of the lower shoe 54 is a surface that faces the first wall surface 12 a of the hole 12 when the insertion portion 13 is inserted into the hole 12 . The front surface 13a is formed as an upward inclined surface, and its inclination angle is set to α° which is equal to the inclination angle of the first wall surface 12a. The rear surface 13b of the insertion portion 13 faces the second wall surface 12b of the hole 12 when the insertion portion 13 is inserted into the hole 12, and a wedge 15 (see FIG. 6) is fitted between the rear surface 13b and the second wall surface 12b. It is a surface that forms a gap for

The side blocks 10 are formed with stepped portions 14, 14 on both side surfaces parallel to the direction perpendicular to the bridge axis and at boundaries between the insertion portion 13 and its upper portion. The stepped portions 14 , 14 are surfaces that engage with the upper surface of the lower shoe 54 when the insertion portion 13 is inserted into the hole 12 .

FIG. 6 shows a wedge, where (a) is a sectional view seen in the direction of the bridge axis, and (b) is a view seen in the direction perpendicular to the axis. The wedge 15 has a front surface 15 a facing the rear surface 13 b of the insertion portion 13 of the side block 10 inserted into the hole 12 and a rear surface 15 b facing the second wall surface 12 b of the hole 12 . The rear surface 15b is formed as a downward inclined surface, and its inclination angle is set to β°, which is the same as the inclination angle of the second wall surface 12b of the hole 12. As shown in FIG.

A flange 16 is provided at the upper end of the wedge 15 and projects toward the rear surface 15b. A bolt 17 fixed to the lower shoe 54 is attached to the flange 16 .

7 and 8 show the state in which the side block 10 is attached and fixed to the lower shoe 54. FIG. 7 is a sectional view seen in the direction of the bridge axis, and FIG. 8 is a view seen in the direction perpendicular to the axis. The insertion portion 13 of the side block 10 is inserted into the hole 12 such that the first wall surface 12a of the hole 12 and the front surface 13a of the insertion portion 13 face each other. Then, the wedge 15 is fitted (driven) into the gap formed between the rear surface 13b of the insertion portion 13 and the second wall surface 12b of the hole 12, and the bolt 17 attached to the flange 16 for retaining the bolt 17 is attached to the lower shoe. 54.

The side block 10 is fixed to the lower shoe 54 as described above, and according to the above embodiment, the following effects are obtained.
(1) The lower insertion portion 13 of the side block 10 is inserted into the hole 12 formed in the lower shoe 54 and is fixed by the wedge 15. Therefore, the conventional projecting portion for bolting is not required. , the structure can be made compact and the cost can be reduced.

(2) The wedge effect causes the inclined front surface 13a of the insertion portion 13 of the side block 10 to be firmly pressed against the inclined first wall surface 12a of the hole 12 of the lower shoe 54. It can resist the upward force that
(3) Stepped portions 14, 14 that engage with the upper surface of the lower shoe 54 are provided on both side surfaces of the side block 10 that are parallel to the direction perpendicular to the bridge axis. can be resisted.

The inclined surfaces formed on the lower shoe and side blocks are preferably processed with an end mill using a machining center or the like. In this case, the corners of the inclined surface of the lower shoe are rounded, and the corners of the inclined surface of the side block are chamfered.

If you want to break the side block with an L1 level seismic force, you should make a thin notch in the stepped part of the side block from the outer peripheral side of the bearing.

The above embodiment is merely an example, and the present invention can take various aspects. For example, in the above embodiments, high surface pressure bearings are shown as bearings to which the present invention is applied, but other types of bearings can be applied as long as the side blocks are fixed to the lower shoe.

10: Side block 12: Hole 12a: First wall surface 12b: Second wall surface 13: Insertion part 13a: Front surface 13b: Rear surface 14: Stepped part 15: Wedge 16: Flange 17: Bolt 50: Bearing 51: Substructure 52: Upper structure 54: Lower shoe 55: Upper shoe 56: Bearing body (elastic load support plate)

Claims (6)

A fixing structure for side blocks that is fixed on a shoe installed on an upper surface of a lower structure and restrains displacement of the upper structure,
The insertion part of the lower part of the side block is inserted into the hole formed in the lower shoe so that there is a gap between the insertion part and the wall surface of the hole,
A fixing structure for a side block in a bridge bearing, wherein a wedge is fitted in the gap. 2. A structure for fixing side blocks in a bridge bearing according to claim 1, wherein said side blocks are provided on both sides of said bearing main body provided on said lower shoe in a direction perpendicular to said bridge axis. The hole is quadrangular in plan view having a pair of wall surfaces parallel to the bridge axis direction and a pair of wall surfaces parallel to the direction perpendicular to the bridge axis, and the insertion portion of the side block is quadrangular in cross section. 3. The fixing structure of the side block in the bridge bearing according to claim 1 or 2, characterized in that: Of the pair of wall surfaces parallel to the bridge axis direction, the first wall surface on the center side of the lower shoe is formed on an inclined surface facing the lower surface side of the lower shoe, and the second wall surface on the outer peripheral side of the lower shoe is formed on an inclined surface facing the upper surface side of the lower shoe,
The insertion portion of the side block has a front surface facing the first wall surface formed into an inclined surface, and a gap in which the wedge is fitted is formed between the rear surface facing the second wall surface. The fixing structure of the side block in the bridge bearing according to claim 3. 5. The fixing of the side block in the bridge bearing according to claim 4, wherein the wedge has a flange on the upper end protruding from the hole, and is fixed to the lower shoe by a bolt attached to the flange. structure. 6. The bridge according to claim 4 or 5, wherein said side blocks are provided with stepped portions on both side surfaces parallel to the direction perpendicular to the bridge axis at boundaries between said insertion portions and upper portions thereof. Fixed structure for side blocks in bearings.

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