Repair structure for bridge

Abstract

To provide a repair structure in a bridge capable of preventing a filling material inserted into a bearing portion from coming out with a simple configuration.SOLUTION: A repair structure in a bridge is provided with a filling material 50 sandwiched between a lower shoe part 22 provided on a pier side of a bearing portion 2 and an upper shoe part 21 provided on a bridge girder side. The filling material 50 is formed such that a dimension in a vertical direction at the other end side is relatively larger than a dimension in a vertical direction at one end side in an extending direction of a bridge girder 3, and has a plurality of acute angle protrusions 51 on a lower surface side.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a repair structure for a bridge, and more particularly to a repair structure for a bridge in which a bridge girder is supported on piers via a support portion.

Background Art

[0002] A bridge generally includes a substructure such as piers, a superstructure such as a bridge girder, and a support portion that supports the bridge girder disposed on the pier. When a vehicle such as a train passes over the bridge girder, the vertical load is transmitted to the support portion. However, if a repeated load acts on the support portion, it may lead to damage to the support portion. A vertical gap may occur due to damage to the support portion. If a gap occurs in the support portion, the contact area between the bridge girder and the support portion decreases, increasing the possibility of fatigue cracks occurring in the support portion. However, since it takes a great deal of effort to substantially repair the support portion with a gap, various proposals have been made to fill the gap.

[0003] For example, Patent Document 1 discloses an intermediate member that can fill a gap formed between an upper support member and a lower support member in a support structure of a support portion provided in a bridge or the like. The support structure includes an upper sole as an upper support member provided on the main girder, a lower sole as a lower support member provided on the girder seat, and an intermediate member provided in contact with the sole surface between the upper sole and the lower sole. Further, since at least one of the front surface or the back surface of the intermediate member is coated with a fluororesin, the lubricity between the upper support member and the lower support member is maintained, and the support function can be maintained.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in the method of Patent Document 1 described above, a displacement prevention fitting is provided at the end of the intermediate member inserted into the gap between the upper board and the lower board to prevent displacement. The displacement prevention fitting is composed of a bolt and a nut and is attached to a hole provided at the end of the intermediate member. Therefore, there has been a problem that the total number of parts is large as a whole fitting, and a large amount of man-hours (labor) are generated during assembly.

[0006] Therefore, an object of the present invention is to provide a repair structure for a bridge that can prevent a packing material inserted into a support portion from coming out with a simple configuration.

Means for Solving the Problems

[0007] In response to the above problems, the repair structure for a bridge according to the present invention is a repair structure for a bridge in which a bridge girder is supported on a bridge pier via a support portion, and includes a packing material sandwiched between a lower board portion provided on the bridge pier side of the support portion and an upper board portion provided on the bridge girder side. The packing material is formed such that the vertical dimension on the other end side is relatively larger than the vertical dimension on one end side in the extending direction of the bridge girder, and has a plurality of acute-angle protrusions on the lower surface side.

[0008] In addition, it is preferable that a concave portion is formed between the plurality of acute-angle protrusions, and the concave portion has a vertical portion extending in the vertical direction and an inclined portion formed continuously with the vertical portion and extending obliquely downward. Further, it is preferable that a plurality of the concave portions are formed from the one end side to the other end side.

[0009] Here, it is preferable that the concave portions are continuous with the same cross section in a direction orthogonal to the extending direction of the bridge girder. Also, it is preferable that the packing material is formed of the same metal material as the lower board portion.

Effects of the Invention

[0010] In the repair structure of the bridge of the present invention configured as described above, the plugging material inserted into the gap formed in the upper and lower sole plate portions is formed such that the vertical dimension on the other end side is relatively larger than the vertical dimension on one end side in the insertion direction, and since it has a plurality of acute-angle protrusions on the lower surface side, it is possible to prevent the plugging material inserted into the support portion from coming out with a simple configuration.

[0011] Further, since the recess formed between the plurality of acute-angle protrusions has a vertical portion extending in the vertical direction and an inclined portion formed continuously with the vertical portion and extending obliquely downward, the plugging material can be easily inserted into the gap, and it is possible to prevent the plugging material once inserted into the gap from coming out.

[0012] Moreover, since a plurality of recesses are formed in the plugging material from one end side to the other end side, the acute-angle protrusions formed at the location where the vertical dimensions coincide in the direction in which the thickness of the plugging material changes contact the sole plate.

[0013] In addition, although the recesses are continuously formed with the same cross-section in the direction orthogonal to the extending direction of the bridge girder, the plugging material comes into contact with the sole plate substantially uniformly in the width direction, so that it is possible to prevent local stress concentration on the plugging material.

[0014] Furthermore, if the plugging material is formed of the same metal material as the lower sole plate portion, it is possible to prevent corrosion from occurring in the support portion.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a schematic configuration of a bridge 1 to which a repair structure according to an embodiment of the present invention is applied. FIG. 2 is a diagram showing a support portion in a state where a gap has occurred. FIG. 3(a) is a schematic diagram showing a bridge in a state where a gap has occurred in the support portion, and FIG. 3(b) is a schematic diagram showing a state where one rivet girder has shifted downward. In the following description, the bridge axis direction is defined as the X direction, the horizontal direction perpendicular to the bridge axis is defined as the Y direction, and the vertical direction is defined as the Z direction.

[0017] As shown in FIG. 1, the bridge 1 includes bridge piers 11, a plurality of rivet girders (bridge girders) 3 that are spanned between the bridge piers 11 and extend in the bridge axis direction, and a support portion 2 that is disposed on the bridge piers 11 and supports each rivet girder 3. The rivet girder 3 is a type of steel girder, and a floor slab 12 constructed of prestressed concrete, reinforced concrete, or the like is laid on the plurality of rivet girders 3 spanned in parallel. Note that the floor slab 12 may be made of steel.

[0018] The end of the rivet girder 3 is placed on the supporting part 2 installed on the upper end surface 111 of the pier 11. This supporting part 2 is mainly composed of, for example, a flat plate-shaped seat part 23 placed on the upper end surface 111 of the pier 11, a washer part (lower washer part) 22 installed on the seat part 23, and a sole plate (upper washer part) 21 interposed between the washer part 22 and the rivet girder 3.

[0019] Here, the seat part 23 is formed of rubber or the like, and the washer part 22 and the sole plate 21 are formed of steel materials. And as shown in FIG. 2, the end of the rivet girder 3 is placed on the upper surface 211 of the flat plate-shaped sole plate 21.

[0020] The rivet girder 3 is mainly composed of an upper flange 33 and a lower flange 31 arranged parallel to each other vertically, and a web 32 that serves as a web connecting between the upper flange 33 and the lower flange 31. More specifically, the portions where the lower surfaces 311, 311 of the approximately L-shaped angle steels 310, 310 in cross-sectional view attached to both sides of the web 32 are formed become the lower flanges 31, 31 of the rivet girder 3. Since the configuration of the upper flange 33 is the same as that of the lower flange 31, detailed description is omitted.

[0021] And on the end of the rivet girder 3 placed on the sole plate 21, supplementary stiffeners 34, 34 are arranged on both sides of the web 32. On the supplementary stiffeners 34, a vertical plane substantially orthogonal to the side surface of the web 32 is formed to connect between the lower flange 31 and the upper flange 33.

[0022] In the bridge 1 having such a configuration, for example, in the case of a railway bridge, repeated loads are applied due to the running of trains. Also, even in the case of a road bridge, repeated loads are applied due to the running of automobiles. The force acting on the floor slab 12 due to the running of trains or automobiles is transmitted to a plurality of rivet girders 3 arranged in parallel under the floor slab 12. And the force acting on the rivet girder 3 is transmitted from the lower flange 31 to the sole plate 21.

[0023] As a result, on the sole plate 21, the vertical movement of the lower flange 31 is repeated due to the repeated action of force and unloading. FIG. 2 is a view showing the support portion 2 in a state where a gap has occurred among the support portions 2 that support a plurality of rivet rows 3.

[0024] As shown in FIG. 2, between the upper surface 222 of the washer portion 22 that has been used for a long time and the lower surface 212 of the sole plate 21, one end of the washer portion 22 may move downward due to the repeated load, and a gap S may be generated between the washer portion 22 and the sole plate 21.

[0025] Although a gap S may also occur between the sole plate 21 and the lower flange 31, hereinafter, the case where a gap occurs between the sole plate 21 and the washer portion 22 will be described. Also, it is assumed that the gap S occurs only in one of the plurality of provided support portions 2.

[0026] Here, as shown in FIG. 3(a), when the train load W acts in a state where the gap S occurs only in the support portion 2 on one side (the left side in the figure) of the pair of support portions 2 provided on the pier 11, as shown in FIG. 3(b), only the lower flange 31 on the side of the support portion 2 where the gap S is formed shifts downward, and a step G is generated on the track surface.

[0027] When the train load W from above repeatedly acts in a state where the step G is generated on the track surface, a crack R (see FIG. 2) will occur at the stress concentration location. Therefore, countermeasures such as repair and reinforcement are required to suppress the progress of the crack R. Therefore, a liner plate (packing material) 50 is inserted into the gap S to avoid stress concentration.

[0028] FIG. 4 is a schematic view of the bridge 1 with the liner plate 50 inserted as viewed from a direction orthogonal to the bridge axis, FIG. 5(a) is a perspective view of the liner plate 50, FIG. 5(b) is a side view of the liner plate 50, and FIG. 6 is a partially enlarged view of the liner plate 50.

[0029] The liner plate 50 shown in Fig. 4 is disposed in the gap S formed between the sole plate 21 and the heel portion 22 in a state where one end side thereof is located on the pier side and the other end side is located on the girder end side. That is, the liner plate 50 has a shape with a changing thickness, and is sandwiched between the heel portion 22 provided on the pier 11 side and the sole plate 21 provided on the rivet girder 3 side in a state where the direction of thickness change (tilt direction) coincides with the bridge axis direction (X direction). Here, the heel portion 22 has a shape convex upward, and in Fig. 4, the convex shape is exaggerated somewhat for illustration.

[0030] As shown in Fig. 5(a), the liner plate 50 has a rectangular shape in top view, and has an extent in the tilt direction, which is the direction from the front end portion 50a, which is one end, toward the rear end portion 50b, which is the other end, and in the width direction, which is orthogonal to the tilt direction. The upper surface of the liner plate 50 is formed substantially flat. Note that the shape of the liner plate 50 in top view is not limited to a rectangular shape, and it may have a circular shape, a triangular shape, or other polygonal shapes.

[0031] The liner plate 50 is formed such that the vertical dimension on the other end side is relatively larger than the vertical dimension on one end side in the extending direction of the rivet girder 3. Specifically, as shown in Fig. 5(b), the liner plate 50 is formed in a tapered shape in which the thickness gradually decreases as it progresses from the front end portion 50a side to the rear end portion 50b side. The degree of taper of the liner plate 50 is not particularly limited, but since the liner plate 50 is formed in a tapered shape in side view, the same liner plate 50 can be used to cope even when the interval of the gap S changes.

[0032] Furthermore, as shown in Fig. 5(b), a plurality of recesses 52 are formed on the lower side of the liner plate 50 along the inclined direction in which the thickness changes. Specifically, the liner plate 50 has a plurality of acute-angle protrusions 51 along the inclined direction on its lower surface side, and recesses 52 are formed between the acute-angle protrusions 51, forming a sawtooth shape in side view. Each acute-angle protrusion 51 is formed in a triangular shape that protrudes downward in side view. The recess 52 may be formed by a method such as notch or perforation. The liner plate 50 is formed such that its thickness gradually decreases as it progresses from the front end 50a to the rear end 50b while repeating the unevenness.

[0033] Since a plurality of acute-angle protrusions 51 are provided from one end side to the other end side of the liner plate 50, a plurality of recesses 52 are formed from one end side to the other end side of the liner plate 50. The number of recesses 52 formed in the liner plate 50 is not particularly limited. Each acute-angle protrusion 51 is formed in the same shape and dimension, but the shape and dimension may be different for each acute-angle protrusion 51.

[0034] In addition, since the liner plate 50 can withstand the load transmitted from above, it is preferably made of a metal material. Also, in order not to cause corrosion due to contact between different metals, the liner plate 50 is preferably formed of the same metal material as the washer portion 22. Specifically, it is desirable that both the liner plate 50 and the washer portion 22 are made of the same metal material such as steel. However, even if the liner plate 50 is not made of the same metal material as the washer portion 22, it may be made of a metal that is more electrochemically noble than the washer portion 22, such as Al or Zn.

[0035] Details of the recess 52 are shown in Fig. 6. Each recess 52 is configured to have a vertical portion 53 extending in the vertical direction and an inclined portion 54 formed continuously with the vertical portion and extending obliquely downward. The vertical portion 53 and the inclined portion 54 are arranged adjacent to each other.

[0036] The vertical portion 53 is formed as a vertical plane extending in the vertical direction. A plurality of vertical portions 53 are provided on the lower side of the liner plate 50 and are formed to protrude downward by a length T. Note that the length T of the vertical portion 53 in the vertical direction is not particularly limited. For example, it may be the same length from the front end portion 50a side to the rear end portion 50b side, or may gradually increase or gradually decrease as it progresses from the front end portion 50a side to the rear end portion 50b side.

[0037] The inclined portion 54 is formed as an inclined surface that inclines downward from the upper part of the vertical portion 53. The inclined portions 54 are formed between the vertical portions 53, and each inclined portion 54 is provided with a uniform length for each width P in the horizontal direction. The inclined portion 54 inclines downward as it progresses from the front end portion 50a to the rear end portion 50b.

[0038] The angle θ formed between the vertical portion 53 and the inclined portion 54 is not particularly limited, but considering that the inclined portion has a function of restricting the movement of the liner plate 50 with respect to the overlapping portion 22 as described later, it is desirable to be within the range of 70 degrees to 85 degrees.

[0039] FIG. 7(a) is a schematic diagram showing a process of inserting the liner plate 50 into a gap S formed between the sole plate 21 and the overlapping portion 22. As shown in FIG. 7(a), the liner plate 50 is inserted into the gap S from one side (girder end side) in the insertion direction toward the other side (span side) in the insertion direction along the bridge axis direction (X direction) (see the white arrow in FIG. 7(a)). The liner plate 50 is inserted so as to move parallel while the concave portion 52 is positioned on the lower side.

[0040] The inclined portion 54 moves in a state of being in contact with the overlapping portion 22. The liner plate 50 is formed in a tapered shape in a side view, and as the liner plate 50 moves in the insertion direction, the vertical interval of the gap S approaches. When the thickness of the liner plate 50 matches the interval of the gap S, a train load W from above as shown in FIG. 7(b) (see the white arrow in FIG. 7(b)) acts, and the protruding end 53a of the vertical portion 53 contacts the overlapping portion 22.

[0041] The liner plate 50 stabilizes in a state where the tip 53a of the adjacent vertical portion 53 bites into the washer portion 22. Thereby, the movement of the liner plate 50 to either the end side in the digit end direction or the span side is restricted.

[0042] Each recess 52 is continuous with the same cross-section in a direction orthogonal to the extending direction of the rivet digit 3. That is, the vertical portion 53 and the inclined portion 54 constituting the recess 52 have the same cross-sectional shape along the width direction (Y direction) of the liner plate 50.

[0043] Note that the insertion position of the liner plate 50 in the gap S is not particularly limited. FIG. 8(a) is a diagram showing an example of a state where the liner plate 50 is inserted into the gap S. As shown in FIG. 8(a), when the thickness of the liner plate 50 is large and the interval of the gap S is small, the liner plate 50 is inserted into one end side in the direction orthogonal to the bridge axis direction (Y direction) of the gap S.

[0044] FIG. 8(b) is a diagram showing another example of a state where the liner plate 50 is inserted into the gap S. As shown in FIG. 8(b), when the thickness of the liner plate 50 is small and the interval of the gap S is large, the liner plate 50 is inserted into the central portion in the direction orthogonal to the bridge axis direction (Y direction) of the gap S. Thus, the insertion position of the liner plate 50 can be varied according to the thickness of the liner plate 50 and the interval of the gap S.

[0045] As described above, in the repair structure of the bridge according to the present embodiment, the liner plate (plugging material) 50 inserted into the gap S formed in the upper and lower washer portions 22 is formed such that the vertical dimension on the other end side is relatively larger than the vertical dimension on one end side in the insertion direction, and has a plurality of acute protrusions on the lower surface side. Therefore, the liner plate 50 can be easily inserted into the gap S, and it is possible to prevent the liner plate 50 once inserted into the gap S from coming out.

[0046] By inserting the liner plate 50 into the gap S, even when a gap occurs in the supporting portion, it is possible to avoid cracks from occurring at the stress concentration points, thereby ensuring the safety of train operation.

[0047] Further, a recess 52 is formed between a plurality of acute-angle protrusions 51. The recess 52 has a vertical portion 53 extending in the vertical direction and an inclined portion 54 formed continuously with the vertical portion 53 and extending obliquely downward. Therefore, when the liner plate 50 is inserted into the gap S, the tip 53a of the vertical portion 53 bites into the sole plate portion 22 and the liner plate 50 is fixed to the sole plate portion 22, thereby restricting the upstream movement of the liner plate 50.

[0048] Also, a plurality of recesses 52 are formed from one end side to the other end side of the liner plate 50, and the liner plate 50 has a sawtooth shape in side view. Therefore, the acute-angle protrusion 51 formed at a location where the vertical dimension is the same in the inclination direction in which the thickness of the liner plate 50 changes comes into contact with the sole plate portion 22, and the movement of the liner plate 50 can be restricted.

[0049] Also, the recesses 52 are formed continuously with the same cross-section along the width direction. Therefore, the liner plate 50 comes into contact with the sole plate portion 22 substantially uniformly in the width direction, and it is possible to prevent stress from concentrating locally on the liner plate 50.

[0050] Note that the liner plate 50 is preferably formed of the same metal material as the lower sole plate portion 22. When the liner plate 50 and the lower sole plate portion 22 are formed of different metal materials, an unintended function as an electrode may occur, and corrosion may occur. Therefore, by forming the liner plate 50 and the lower sole plate portion 22 of the same metal material, it is possible to prevent corrosion from occurring in the supporting portion 2.

[0051] As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are included in the present invention.

Explanation of Symbols

[0052] 1: Bridge 2: Support part 3: Rivet girder (bridge girder) 11: Bridge pier 21: Sole plate (upper sole part) 22: Sole part (lower sole part) 50: Liner plate 51: Acute angle protrusion 52: Concave part 53: Vertical part 54: Inclined part S: Gap

Claims

1. A repair structure for a bridge that supports a bridge girder via a support portion on a bridge pier, comprising a packing material sandwiched between a lower packing portion provided on the bridge pier side of the support portion and an upper packing portion provided on the bridge girder side, wherein the packing material is formed such that the vertical dimension on the other end side is relatively larger than the vertical dimension on one end side in the extending direction of the bridge girder, and has a plurality of acute protrusions on the lower surface side. A repair structure for a bridge characterized by this.

2. A recess is formed between the plurality of acute protrusions, wherein the recess has a vertical portion extending in the vertical direction and an inclined portion formed continuously with the vertical portion and extending obliquely downward. A repair structure for a bridge according to Claim 1, characterized by this.

3. A plurality of the recesses are formed from the one end side to the other end side. A repair structure for a bridge according to Claim 2, characterized by this.

4. The recesses are continuous with the same cross-section in a direction orthogonal to the extending direction of the bridge girder. A repair structure for a bridge according to Claim 2 or 3, characterized by this.

5. The packing material is formed of the same metal material as the lower packing portion. A repair structure for a bridge according to Claim 1 or 2, characterized by this.

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