Extending device for bridge and face plate

Abstract

To provide an extending device for a bridge in which a seal member can be provided in a joint gap without being affected by slabs and a load on the seal member can be reduced.SOLUTION: A joint plate 32 includes a fixed plate portion 32B, a joint plate portion 32A that is formed integrally with the fixed plate portion 32B, extends from the fixed plate portion 32B toward an opposing surface OS1 of another joint plate 31, and has an opposing surface OS2 facing the opposing surface OS1 of the other joint plate 31 across a gap G2, and a lengthwise plate portion 32C that is formed integrally with the lower surface of the joint plate portion 32A and extends downward from the lower surface. The joint plate portion 32A is formed as such that the thickness dimension from the upper surface to the position where the lengthwise plate portion 32C is provided is smaller than the thickness dimension of the fixed plate portion 32B. A seal member 3B is provided in a space G3 formed below the joint plate portion 32A between the lengthwise plate portion 32C and the other joint plate 31.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an expansion and contraction device for bridges and a face plate.

Background Art

[0002] In an expansion and contraction device for a bridge provided in the clearance between a pair of opposing bridge girders or between an opposing bridge girder and a bridge abutment, a gap is formed on the surface so that it can expand and contract following the expansion and contraction of the bridge girder due to temperature changes. As a conventional expansion and contraction device for a bridge, a configuration in which a seal member such as a gutter is provided in the gap is known (see, for example, Patent Document 1 and Patent Document 2). The seal member is formed along a wave-shaped gap formed on the surface, and is provided so as to close the gap in the wave-shaped extending gap.

[0003] Further, as another expansion and contraction device for a bridge, a configuration including a face plate arranged on the surface and a seal member arranged below the face plate is known (see, for example, Patent Document 3, Patent Document 4, and Non-Patent Document 1). The face plate has a pair of joint plates whose opposing surfaces are formed in an uneven shape. The pair of joint plates are arranged opposite to each other with a gap between their opposing surfaces. The seal member is composed of a water stop material and a gutter, and is linearly arranged below the gap so as to be arranged over the entire gap that changes in a wave shape of the face plate.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Non-Patent Documents

[0005] [Non-Patent Document 1] Construction and Construction Guidelines for Appendages of the Metropolitan Expressway Co., Ltd., Part 2 [Expansion Joint Part] [Summary of the Invention] [Problems to be Solved by the Invention]

[0006] In the configurations shown in Patent Document 1 and Patent Document 2, when the gap on the surface becomes narrow due to the expansion of the bridge girder or the like, the dimension of the seal member installed in the gap in the bridge girder direction also becomes smaller accordingly. For this reason, a large compressive load is applied to the seal member. In addition, since the seal member is formed in a wave shape along the gap, there is a risk that the diagonal part of the seal member will be deformed in the twisting direction when the bridge girder expands or the like, and an even larger compressive load will be applied to the seal member. For this reason, in the configuration in which the seal member is provided in the gap, there are concerns about the durability of the seal member, and it is desirable to reduce the load on the seal member.

[0007] On the other hand, in the configurations shown in Patent Document 3, Patent Document 4, and Non-Patent Document 1, a seal member composed of a waterstop material and a gutter that is larger than the width of the gap between the face plates is provided below the gap between the face plates. Thereby, in the configurations shown in Patent Document 3, Patent Document 4, and Non-Patent Document 1, the compressive load on the waterstop material and the seal member can be reduced when the bridge girder expands or the like, and the waterstop effect can be maintained accordingly. However, when a floor slab (for example, a steel floor slab) is provided below the paving block where the bridge expansion device is installed, if the width of the clearance where the bridge expansion device is provided is small, the floor slab may protrude greatly toward the clearance side. For this reason, when the thickness dimension of the paving portion on the floor slab is small, the floor slab protruding toward the clearance side becomes an obstacle, and there is a problem that it is difficult to provide a seal member in the clearance below the face plate.

[0008] An object of the present invention is to provide a bridge expansion device and a face plate that can provide a seal member in a clearance without being affected by a floor slab and can also reduce the load on the seal member as compared with the prior art.

Means for Solving the Problem

[0009] The expansion and contraction device for bridges of the present invention is an expansion and contraction device for bridges provided in the clearance between a pair of opposing bridge girders or between an opposing bridge girder and a bridge abutment, and includes a face plate having a pair of joint plates whose opposing surfaces are arranged to face each other with a gap therebetween, and a seal member provided below the gap of the face plate. Among the pair of joint plates, at least one of the joint plates includes a fixing plate portion fixed to the floor slab of the bridge girder, a joint plate portion integrally formed with the fixing plate portion, extending from the fixing plate portion toward the opposing surface of the other joint plate, and having an opposing surface facing the opposing surface of the other joint plate with the gap therebetween, and a vertical plate portion integrally formed on the lower surface of the joint plate portion and extending downward from the lower surface. The thickness dimension of the joint plate portion from the opposing surface to the position where the vertical plate portion is provided is formed to be smaller than the thickness dimension of the fixing plate portion, and the seal member is provided in the space between the vertical plate portion and the other joint plate formed below the joint plate portion.

[0010] The face plate of the present invention is a face plate of an expansion and contraction device for bridges provided in the clearance between a pair of opposing bridge girders or between an opposing bridge girder and a bridge abutment, and has a pair of joint plates whose opposing surfaces are arranged to face each other with a gap therebetween. Among the pair of joint plates, at least one of the joint plates includes a fixing plate portion fixed to the floor slab of the bridge girder, a joint plate portion integrally formed with the fixing plate portion, extending from the fixing plate portion toward the opposing surface of the other joint plate, and having an opposing surface facing the opposing surface of the other joint plate with the gap therebetween, and a vertical plate portion integrally formed on the lower surface of the joint plate portion and extending downward from the lower surface. The thickness dimension of the joint plate portion from the opposing surface to the position where the vertical plate portion is provided is formed to be smaller than the thickness dimension of the fixing plate, and a seal member arranged below the gap is provided in the space between the vertical plate portion and the other joint plate.

Advantages of the Invention

[0011] According to the present invention, by making the thickness dimension of the joint plate portion integrally formed with the fixed plate portion smaller than the thickness dimension of the fixed plate portion, a space for installing the seal member can be secured below the joint plate portion accordingly. Therefore, it becomes easier to install the seal member below the joint plate portion, and the seal member can be provided in the clearance without being affected by the floor plate more than before. Further, since the seal member can be installed in a space larger than the clearance secured below the joint plate portion without providing the seal member in the clearance between the pair of joint plates, the load on the seal member can also be reduced.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0013] Hereinafter, the first embodiment of the present invention will be described. In the following description, the same parts as those already described will be denoted by the same reference numerals and the description thereof will be omitted.

[0014] (1) First Embodiment FIG. 1 is a partial cross-sectional perspective view showing the construction structure of the expansion device 3 for bridges according to the first embodiment. FIG. 2 is a vertical (Z-axis) direction cross-sectional view showing the construction structure of the expansion device for bridges when viewed in the Y-axis direction from the lower left of FIG. 1 along the D1-D1 line of FIG. 1. In this specification, the expansion direction of the bridge girder 1 (for example, the bridge axis direction which is the traveling direction of vehicles) is defined as the X-axis, the longitudinal direction (clearance direction) of the expansion device 3 for bridges extending along the clearance G1 of the bridge girder 1 is defined as the Y-axis, and the height direction of the bridge girder 1 is defined as the Z-axis for explanation. The same applies to FIGS. 3 and subsequent figures. In the first embodiment, as an example, a configuration in which the expansion device 3 for bridges is provided in the clearance G1 between the bridge girder 1 and the abutment 2 will be described. Here, first, the configuration of the bridge girder 1 and the abutment 2 arranged opposite to the bridge girder 1 will be described below.

[0015] <Configuration of Bridge Girder> The bridge girder 1 includes a steel floor slab 11 and a paving section 12. The steel floor slab 11 is composed of a steel deck plate and supports the wheel loads of vehicles passing on the road surface (upper surface) of the bridge girder 1. The paving section 12 is composed of asphalt concrete or the like placed on the steel floor slab 11. The thickness dimension T along the Z-axis of the paving section 12 is set to, for example, 60 mm to 80 mm. At the end in the expansion and contraction direction (end in the X-axis direction) of the steel floor slab 11, there is an area where the paving section 12 is not provided. The steel floor slab 11 protrudes from the paving section 12 towards the clearance G1 side at the end, and the end is exposed in the clearance G1. A plurality of stud bolts 111 are erected on the upper surface of the steel floor slab 11 protruding from the paving section 12 towards the clearance G1 side. Each stud bolt 111 is joined to the upper surface of the steel floor slab 11 by welding. As shown in FIG. 2, in the steel floor slab 11 according to the present embodiment, a plurality of stud bolts 111 are arranged in a row at predetermined intervals along the clearance direction (Y-axis direction), and a plurality of rows of stud bolts 111 arranged in a row are provided in parallel. The plurality of rows of stud bolts 111 arranged in parallel are arranged alternately so as not to be arranged in the X-axis direction with respect to each other. In FIG. 2, among the stud bolts 111 and nuts 112 arranged alternately in the X-axis direction along the Y-axis direction in FIG. 1, the stud bolts 111 and nuts 112 on the D1-D1 line are shown. In FIG. 2, for easy visual recognition, on the D1-D1 line in FIG. 1, the stud bolts 111 and nuts 112 viewed from the Y-axis direction are shown as solid lines without showing the cross-sectional configuration. The same applies to FIGS. 6, 7, 8, and 9, which are vertical sectional views from the second embodiment onwards.

[0016] <Configuration of abutment> The abutment 2 includes a concrete part 21. The concrete part 21 is arranged at a distance (hereinafter also referred to as the floor slab clearance distance) W1 from the steel floor slab 11 of the bridge girder 1. In the concrete part 21, a cut-out part 21A recessed along the clearance G1 is provided at the end on the clearance G1 side. An anchor part 23A is provided on the bottom surface of the cut-out part 21A. The anchor part 23A includes a plurality of embedded anchors 23 embedded in the bottom surface and a continuous bar 24 provided on the embedded anchor 23. The embedded anchor 23 according to the present embodiment is a reinforcing bar bent in a U shape (FIG. 2) and is embedded in the bottom surface of the cut-out part 21A at a predetermined interval along the Y-axis direction. Each embedded anchor 23 has a curved part embedded in the bottom surface so that both ends are exposed from the bottom surface of the cut-out part 21A. The continuous bar 24 is a bar-shaped reinforcing bar and is welded to the ends of the embedded anchors 23 arranged along the Y-axis direction. A cast-in-place concrete 25 and a paving part 22 are provided on the upper surface of the concrete part 21 where the cut-out part 21A is not formed.

[0017] <Configuration of the bridge expansion device> Next, the configuration of the bridge expansion device 3 provided in the clearance G1 between the opposing bridge girders 1 and abutments 2 will be described. The bridge expansion device 3 includes a face plate 3A and a seal member 3B. The face plate 3A is a finger joint, and the height position of the upper surface of the face plate 3A exposed to the outside is installed so as to match the height position of the upper surfaces of the pavements 12 and 22 exposed to the outside. The face plate 3A includes a pair of joint plates 31 and 32 whose opposing surfaces OS1 and OS2 are arranged to face each other with a gap G2 therebetween. Here, for convenience of explanation, the joint plate 31 arranged on the abutment 2 side will be referred to as the abutment side joint plate 31, and the joint plate 32 arranged on the bridge girder 1 side will be referred to as the bridge girder side joint plate 32 and will be described below.

[0018] The abutment side joint plate 31 includes a joint plate portion 31A, a vertical plate portion 31B extending downward from the lower surface of the joint plate portion 31A, and a plurality of anchor plates 31C provided on the side surface of the vertical plate portion 31B. The joint plate portion 31A, the vertical plate portion 31B, and the anchor plate 31C are made of, for example, steel members and are integrally formed of the same material. The joint plate portion 31A extends in the clearance direction (Y-axis direction) and protrudes from the abutment 2 toward the clearance G1. At the tip of the joint plate portion 31A, a corrugated opposing surface OS1 with alternating concavities and convexities formed along the clearance direction is provided. The vertical plate portion 31B extends downward from the lower surface of the joint plate portion 31A. The vertical plate portion 31B extends along the longitudinal direction of the joint plate portion 31A.

[0019] The joint plate portion 31A and the vertical plate portion 31B of the abutment side joint plate 31 are integrally formed by casting, for example. The plurality of anchor plates 31C are respectively provided on the side surface of the vertical plate portion 31B at predetermined intervals along the longitudinal direction of the vertical plate portion 31B. Each anchor plate 31C has the same configuration and is made of a steel plate-like body. The base end of the anchor plate 31C is fixed to the side surface of the vertical plate portion 31B by welding or the like, and the tip extends into the knockout portion 21A of the concrete portion 21 so as to move away from the side surface of the vertical plate portion 31B. Further, at the tip of the anchor plate 31C, a hook with an end folded back from the lower side toward the side surface of the vertical plate portion 31B is provided.

[0020] For the anchor plate 31C, the hook at the tip is engaged with the outer through-bar 24 extending in the Y-axis direction arranged in the knockout portion 21A of the concrete portion 21. Also, for the anchor plate 31C, the curved portion at the base end is engaged with the clearance-side through-bar 24 extending in the Y-axis direction arranged in the knockout portion 21A of the concrete portion 21. The anchor plate 31C is embedded inside the cast-in-place concrete 25 placed in the knockout portion 21A. The surface of the joint plate portion 31A is arranged (for example, arranged flush) in accordance with the surface of the paving portion 22 provided on the cast-in-place concrete 25.

[0021] Next, the structure of the bridge girder side joint plate 32 will be described. The bridge girder side joint plate 32 is fixed to the end of the bridge girder 1 disposed opposite to the abutment 2. The bridge girder side joint plate 32 includes a joint plate portion 32A, a fixing plate portion 32B, and a vertical plate portion 32C. The joint plate portion 32A, the fixing plate portion 32B, and the vertical plate portion 32C are made of, for example, steel members and are integrally formed of the same material. As shown in FIG. 1, the joint plate portion 32A extends in the width direction (Y-axis direction) of the bridge. Further, the joint plate portion 32A protrudes from the paving portion 12 toward the clearance G1 side and is cantilever-supported with respect to the fixing plate portion 32B. The joint plate portion 32A has a configuration in which a plurality of concavities and convexities are formed on the opposing surface OS2 along the width direction of the bridge and has a corrugated opposing surface OS2. The fixing plate portion 32B extends in the width direction (Y-axis direction) of the bridge. On the upper surface of the fixing plate portion 32B, a plurality of through holes 321 are formed that penetrate to the lower surface of the fixing plate portion 32B and have countersinks for bolt storage formed on the upper surface.

[0022] Here, a plurality of filler plates 13 are provided on the upper surface of the steel floor plate 11 that protrudes from the paving portion 12 toward the clearance G1 side. Each stud bolt 111 provided on the steel floor plate 11 is inserted through each filler plate 13. The tip of the stud bolt 111 protrudes from the upper surface of the uppermost filler plate 13. Each stud bolt 111 protruding from the filler plate 13 disposed on the steel floor plate 11 is inserted into the corresponding countersunk through hole 321 in the fixing plate portion 32B. By providing the fixing plate portion 32B on the steel floor plate 11 with a plurality of filler plates 13 interposed therebetween, the heights of the upper surface of the fixing plate portion 32B and the upper surface of the paving portion 12 are made the same. Thereby, the boundary between the upper surface of the fixing plate portion 32B and the upper surface of the paving portion 12 is formed in a continuous planar shape without a large step.

[0023] The fixed plate portion 32B has nuts 112 screwed onto stud bolts 111 disposed in respective through holes 321, and is fixed to the end of the steel floor plate 11. Thereby, the fixed plate portion 32B can cantilever support the joint plate portion 32A integrally formed at the end of the fixed plate portion 32B. The fixed plate portion 32B is arranged such that the joint plate portion 32A extends from the end of the fixed plate portion 32B toward the opposing surface OS1 of the other abutment side joint plate 31. Further, the fixed plate portion 32B arranges the opposing surface OS2 of the joint plate portion 32A with a gap G2 interposed from the opposing surface OS1 of the other abutment side joint plate 31.

[0024] Here, FIG. 3 is a perspective view (plan perspective view) showing the structure of the girder side joint plate 32. Also, 1001 on the upper side of FIG. 4 is a top view (plan view) showing the structure of the girder side joint plate 32, 1002 on the left side of FIG. 4 is a left side view showing the structure of the girder side joint plate 32, 1003 on the right side of FIG. 4 is a right side view showing the structure of the girder side joint plate 32, and 1004 on the lower side of FIG. 4 is a front view showing the structure of the girder side joint plate 32. Further, 1011 on the upper side of FIG. 5 is a bottom view (bottom plan view) showing the structure of the girder side joint plate 32, and 1012 on the lower side of FIG. 5 is a rear view showing the structure of the girder side joint plate 32.

[0025] As shown in FIGS. 3, 4, and 5, the joint plate portion 32A is integrally formed at the end of the fixed plate portion 32B and protrudes from the end so as to move away from the end of the fixed plate portion 32B. Also, the boundary between the upper surface of the joint plate portion 32A and the upper surface of the fixed plate portion 32B is formed in a continuous planar shape without a step. The thickness dimension T2 of the joint plate portion 32A in the Z-axis direction (height direction) is set smaller than the thickness dimension T1 of the fixed plate portion 32B in the Z-axis direction. Thereby, the joint plate portion 32A is formed thin so as to have a thickness dimension difference T3 in the Z-axis direction with respect to the fixed plate portion 32B. The thickness dimension T2 of the joint plate portion 32A is determined from the protruding dimension into the clearance G1 of the fixed plate portion 32B and the wheel load of the vehicle acting on the joint plate portion 32A and the like. Note that it is preferable that the joint plate portion 31A of the abutment side joint plate 31 also has the same thickness dimension T2 as the thickness dimension T2 of the joint plate portion 32A of the girder side joint plate 32.

[0026] The vertical plate portion 32C extends in the width direction (Y-axis direction) of the bridge and extends downward from the lower surface of the proximal end of the joint plate portion 32A. That is, the joint plate portion 32A is formed such that the thickness dimension T2 from the opposing surface OS1 to the position where the vertical plate portion 32C is provided is smaller than the thickness dimension T1 of the fixed plate portion 32B. The lower end of the vertical plate portion 32C is located below the lower surface of the fixed plate portion 32B. The dimension (extension dimension) T4 by which the vertical plate portion 32C extends downward from the lower surface of the fixed plate portion 32B is desirably set to a dimension that can improve the bending rigidity of the joint plate portion 32A that is cantilever-supported by the fixed plate portion 32B. Thus, by providing the vertical plate portion 32C at the proximal end of the joint plate portion 32A, the proximal end portion of the joint plate portion 32A is reinforced by the vertical plate portion 32C, and the bending rigidity of the joint plate portion 32A can be improved. Therefore, it is also possible to increase the protruding dimension of the joint plate portion 32A from the fixed plate portion 32B toward the clearance G1 side, or to make the thickness dimension T2 of the joint plate portion 32A thinner than the thickness dimension T1 of the fixed plate portion 32B in the Z-axis direction.

[0027] The bridge girder side joint plate 32 can be integrally formed by the following manufacturing method. First, a strip-shaped steel plate having a thickness of the thickness dimension of the vertical plate portion 32C (the thickness dimension T1 of the fixed plate portion 32B + the extension dimension T4 of the vertical plate portion 32C) is cut in the height direction to form a thin joint plate portion 32A, a fixed plate portion 32B thicker than the joint plate portion 32A, and a vertical plate portion 32C. Then, a plurality of uneven processes are performed on the tip of the joint plate portion 32A to form a corrugated opposing surface OS1 at the tip of the joint plate portion 32A. Also, a plurality of through holes 321 having countersinks are drilled in the fixed plate portion 32B so as to penetrate in the thickness direction. Note that the manufacturing method of the bridge girder side joint plate 32 is not limited to the above manufacturing method, and as long as the joint plate portion 32A, the fixed plate portion 32B, and the vertical plate portion 32C can be integrally formed, they may be manufactured by various other manufacturing methods. For example, a strip-shaped steel plate having a thickness dimension T1 of the fixed plate portion 32B may be cut in a rectangular shape in the height direction to form a thin joint plate portion 32A, and a vertical plate portion 32C made of a strip-shaped steel plate may be separately fixed and integrated to the lower surface of the proximal end of the joint plate portion 32A by welding or the like.

[0028] Next, the seal member 3B will be described. The seal member 3B according to the present embodiment is an elastic waterstop material formed of silicone rubber or the like and having a rectangular cross-section. As shown in FIGS. 1 and 2, the seal member 3B is provided in a space G3 between the vertical plate portion 31B of the abutment-side joint plate 31 and the vertical plate portion 32C of the girder-side joint plate 32. The seal member 3B is disposed below the gap G2 so as to extend along the width direction (Y-axis direction) of the abutment-side joint plate 31 and the girder-side joint plate 32. Further, the seal member 3B is provided so as to fill the space G3 between the vertical plate portion 31B of the abutment-side joint plate 31 and the vertical plate portion 32C of the girder-side joint plate 32. Thereby, the seal member 3B seals the space G3 between the vertical plate portion 31B and the vertical plate portion 32C, and stops rainwater from the upper gap G2. Note that the seal member 3B is provided non-adhesively on the lower surfaces of the joint plate portion 31A of the abutment-side joint plate 31 and the joint plate portion 32A of the girder-side joint plate 32. The non-adhesive treatment can be performed by previously applying a release agent such as a fluorine-based release agent to the lower surfaces of the joint plate portions 31A and 32A when the seal member 3B is attached.

[0029] Here, in the space G3 between the vertical plate portion 31B of the abutment-side joint plate 31 and the vertical plate portion 32C of the girder-side joint plate 32, the thickness dimension T2 of the joint plate portion 32A is formed to be thinner than the thickness dimension T1 of the fixed plate portion 32B by a thickness difference T3. Therefore, a larger space G3 can be secured below the joint plate portion 31A and the joint plate portion 32A accordingly. In this way, the space G3 between the vertical plate portion 31B and the vertical plate portion 32C formed below the joint plate portion 31A and the joint plate portion 32A is larger by the thickness difference T3 compared to a conventional structure in which the thickness dimension T1 of the fixed plate portion 32B and the thickness dimension T2 of the joint plate portion 32A are the same thickness dimension. Thus, the thickness dimension of the seal member 3B can be increased accordingly. Further, since the lower surface of the joint plate portion 32A of the seal member 3B is separated from the upper surface of the steel floor plate 11 by the thickness difference T3 in the height direction, even if the thickness dimension of the seal member 3B is increased accordingly, the seal member 3B can be installed in the space G3 without interfering with the steel floor plate 11.

[0030] <Construction Method of Expansion Joint Device for Bridge> Next, the construction method of the expansion joint device 3 for the bridge will be briefly described. First, the anchor plate 31C of the abutment side joint plate 31 is engaged with the through-bar 24 exposed on the bottom surface of the box-out portion 21A of the concrete part 21. Then, as shown in Fig. 2, the in-situ concrete 25 is placed in the box-out portion 21A, and a plurality of anchor plates 31C are embedded inside the in-situ concrete 25. After the in-situ concrete 25 is cured, the abutment side joint plate 31 is fixed to the abutment 2. Finally, the paving part 22 is laid.

[0031] On the bridge girder 1 side, the filler plate 13 is installed on the upper surface of the steel floor slab 11 such that a plurality of stud bolts 111 erected on the steel floor slab 11 are inserted into the holes of the filler plate 13. At this time, when the fixing plate portion 32B of the bridge girder side joint plate 32 is installed on the upper surfaces of the stacked plurality of filler plates 13, the number of stacked filler plates 13 and the like are adjusted so that the upper surface of the fixing plate portion 32B coincides with the upper surface of the paving part 12. Then, the fixing plate portion 32B is installed on the upper surface of the filler plate 13 such that each stud bolt 111 exposed from the upper surface of the filler plate 13 is inserted into the corresponding through-hole 321 of the fixing plate portion 32B of the bridge girder side joint plate 32. Then, nuts 112 are screwed onto the stud bolts 111 in the respective through-holes 321 of the fixing plate portion 32B, and the bridge girder side joint plate 32 is fixed to the upper end surface of the end of the steel floor slab 11 of the bridge girder 1 with the filler plate 13 interposed therebetween.

[0032] Next, after applying a fluorine-based release agent or the like to the lower surface of the joint plate portion 31A of the abutment side joint plate 31 and the lower surface of the joint plate portion 32A of the bridge girder side joint plate 32, the end portions (end portions facing in the X-axis direction) of the seal member 3B are fixed to the side surfaces of the vertical plate portion 31B of the abutment side joint plate 31 and the side surfaces of the vertical plate portion 32C of the bridge girder side joint plate 32 with an adhesive or the like. In this way, the seal member 3B is installed in the space G3 between the vertical plate portion 31B of the abutment side joint plate 31 and the vertical plate portion 32C of the bridge girder side joint plate 32.

[0033] <Function and Effect> According to the above configuration, in the expansion joint device 3 for bridges, the bridge girder side joint plate 32 is provided with a fixing plate portion 32B and a joint plate portion 32A integrally formed with the fixing plate portion 32B and having a thickness dimension T2 smaller than the thickness dimension T1 of the fixing plate portion 32B. Further, in the expansion joint device 3 for bridges, the bridge girder side joint plate 32 is set such that the distance in the height direction from the upper surface of the steel floor slab 11 to the lower surface of the joint plate portion 32A is larger than the distance in the height direction from the upper surface of the steel floor slab 11 to the lower surface of the fixing plate portion 32C. Further, in the expansion joint device 3 for bridges, a seal member 3B is provided in a space G3 formed below the joint plate portion 32A of the bridge girder side joint plate 32 between the vertical plate portion 32C and the other abutment side joint plate 31.

[0034] In the expansion joint device 3 for bridges, by reducing the thickness dimension T2 of the joint plate portion 32A, the joint plate portion 32A can be separated in the height direction from the upper surface of the steel floor slab 11, and a space G3 for installing the seal member 3B can be secured below the joint plate portion 32A. Therefore, in the expansion joint device 3 for bridges, it becomes easier to install the seal member 3B below the joint plate portion 32A, and the seal member 3B can be provided in the clearance G1 without being affected by the steel floor slab 11 more than before. Further, since the bridge girder side joint plate 32 can form the fixing plate portion 32B thicker than the joint plate portion 32A even if the joint plate portion 32A is formed thin, the strength at the fixing plate portion 32B can be improved.

[0035] In addition, the expansion and contraction device 3 for bridges installs the seal member 3B in a space G3 that is larger than the gap G2 and is secured below the joint plate portion 32A, without providing the seal member 3B in the gap G2 between the pair of joint plates 31 and 32. As a result, the expansion and contraction device 3 for bridges can also reduce the load on the seal member 3B that occurs when the surface gap G2 expands and contracts due to the expansion of the bridge girder 1 or the like. Furthermore, the bridge girder side joint plate 32 can improve the bending rigidity of the joint plate portion 32A that is cantilever-supported by integrally forming the joint plate portion 32A, the fixing plate portion 32B, and the vertical plate portion 32C. In addition to this, the bridge girder side joint plate 32 has a vertical plate portion 32C that extends downward integrally formed on the lower surface of the joint plate portion 32A. For this reason, in the bridge girder side joint plate 32, the base end portion of the joint plate portion 32A provided with the vertical plate portion 32C becomes thicker due to the vertical plate portion 32C, and the base end portion of the joint plate portion 32A can be reinforced by the vertical plate portion 32C, and accordingly, the bending rigidity of the joint plate portion 32A that is cantilever-supported can be improved. Therefore, in the bridge girder side joint plate 32, it is also possible to increase the protruding dimension of the joint plate portion 32A from the fixing plate portion 32B toward the clearance G1 side, or to make the thickness dimension T2 of the joint plate portion 32A thinner than the thickness dimension T1 of the fixing plate portion 32B in the Z-axis direction.

[0036] And the seal member 3B is provided non-adherently on the lower surface of one joint plate portion 32A and the lower surface of the other joint plate portion 31A, respectively. The seal member 3B according to the present embodiment is adhered to the side surfaces of the vertical plate portions 31B and 32C and is held between the side surfaces of the vertical plate portions 31B and 32C. When the expansion and contraction device 3 for bridges is adhesively bonded on three sides (the lower surfaces of the joint plate portions 31A and 32A and the three sides of the opposing side surfaces of the vertical plate portions 31B and 32C), there is a possibility that a torsional force acts on the seal member 3B and the load on the seal member 3B increases. In contrast, the expansion and contraction device 3 for bridges suppresses the action of the torsional force on the seal member 3B by making the seal member 3B non-adherent to the lower surface of one joint plate portion 32A and the lower surface of the other joint plate portion 31A, respectively, and can reduce the load acting on the seal member 3B.

[0037] (2) Second Embodiment Next, a second embodiment of the present invention will be described. In the first embodiment, the case where the bridge expansion device 3 is provided in the clearance G1 between the bridge girder 1 and the abutment 2 where the floor slab clearance distance W1 in the clearance G1 between the bridge girder 1 and the abutment 2 is large and the steel floor slab 11 does not interfere with the installation of the seal member 3B was described. In contrast, in the second embodiment, as shown in FIG. 6, the case where the bridge expansion device 3 is provided in the clearance G1 between the bridge girder 1 and the abutment 2 where the floor slab clearance distance W2 in the clearance G1 between the bridge girder 1 and the abutment 2 is small and the steel floor slab 11 may interfere with the installation of the seal member 3B will be described.

[0038] Since the thickness dimension T2 of the joint plate portion 32A of the bridge girder side joint plate 32 is smaller than the thickness dimension T1 of the fixed plate portion 32B, the lower surface of the joint plate portion 32A can be separated from the upper surface of the steel floor slab 11 in the height direction by that amount. As a result, the bridge girder side joint plate 32 allows the seal member 3B to be disposed above the steel floor slab 11 protruding into the clearance G1, and the seal member 3B can be installed below the joint plate portion 32A without interfering with the steel floor slab 11. Therefore, for example, even at a site where the floor slab clearance distance W2 from the end of the steel floor slab 11 to the end of the concrete portion 21 is narrow, the seal member 3B having a width in the X-axis direction larger than the floor slab clearance distance W2 can be installed in the space G3 above the steel floor slab 11 protruding into the clearance G1. As described above, the bridge expansion device 3 can also be provided in the clearance G1 with a narrower floor slab clearance distance W2.

[0039] (3) Third Embodiment Next, a third embodiment of the present invention will be described. In the first embodiment, the case where the bridge expansion device 3 is provided in the clearance G1 between the bridge girder 1 and the abutment 2 was described. Here, as shown in FIG. 7, the case where the bridge expansion device 4 is provided in the clearance G4 between the bridge girders 1 will be described below. In FIG. 7, instead of the abutment 2 shown in FIG. 1, a bridge girder 1 is provided, and the bridge expansion device 4 is provided in the clearance G4 between the bridge girders 1. Therefore, the bridge expansion device 4 has a configuration in which a pair of bridge girder side joint plates 32, 32 constituting the face plate 4A are provided. In this case, the pair of bridge girder side joint plates 32, 32 have the same configuration, and similar to the first embodiment described above, the joint plate portion 32A, the fixing plate portion 32B, and the vertical plate portion 32C are integrally formed respectively.

[0040] The bridge expansion device 4 can be fixed to the steel floor plate 11 of the bridge girder 1 with the filler plate 13 interposed between the fixing plate portions 32B of the pair of bridge girder side joint plates 32, 32 by the same fixing method as in the first embodiment described above, and can exhibit the same actions and effects as in the first embodiment described above.

[0041] (4) Fourth Embodiment A fourth embodiment of the present invention will be described. In the first embodiment described above, the vertical plate portion 32C extending downward from the lower surface of the joint plate portion 32A was described for the bridge girder side joint plate 32 provided at a right angle to the lower surface of the joint plate portion 32A, but the present invention is not limited to this. For example, as shown in FIG. 8, the vertical plate portion 52C extending downward from the lower surface of the joint plate portion 52A may be a bridge girder side joint plate 52 integrally formed with an R surface provided with respect to the lower surface of the joint plate portion 52A. The bridge girder side joint plate 52 has a configuration in which the joint plate portion 52A, the fixing plate portion 52B, and the vertical plate portion 52C are integrally formed, and the lower end of the vertical plate portion 52C extends below the lower surface of the fixing plate portion 52B. Also, the bridge girder side joint plate 52 is formed such that the thickness dimension T2 of the joint plate portion 32A is smaller than the thickness dimension T1 of the fixing plate portion 32B, similar to the first embodiment described above. Therefore, the bridge girder side joint plate 52 can also exhibit the same actions and effects as in the first embodiment described above.

[0042] Note that the bridge girder side joint plate 52 according to the fourth embodiment, in which the joint plate portion 52A and the vertical plate portion 52C are integrally formed with an R surface, can be manufactured, for example, by casting molten steel to integrally form the joint plate portion 52A, the fixing plate portion 52B, and the vertical plate portion 52C simultaneously.

[0043] Specifically, a plurality of concavities and convexities of the joint plate portion 52A are formed in a mold in advance, and after arranging a plurality of cores corresponding to the shape of the through holes 521 in the mold, molten steel is poured into the mold, whereby the bridge girder side joint plate 52 in which the joint plate portion 52A, the fixing plate portion 52B, and the vertical plate portion 52C are integrally formed can be manufactured. In this case, since a plurality of concavities and convexities of the joint plate portion 52A and a plurality of through holes 521 of the fixing plate portion 52B can be formed simultaneously during casting, the processing labor of the bridge girder side joint plate 52 can be reduced. During casting, in order to form an R surface at the boundary portion between the joint plate portion 52A and the vertical plate portion 52C, an R surface with a gentle slope is provided at the corresponding portion of the mold, so that the circulation of the molten steel can be improved.

[0044] (5) Fifth Embodiment Next, the fifth embodiment of the present invention will be described. In the above-described first embodiment, the bridge expansion device 3 provided with the seal member 3B made of an elastic waterstop material such as silicone rubber has been described, but the present invention is not limited thereto. As the seal member, for example, as shown in FIG. 9, a dry waterstop material in which a plurality of urethane foams are laminated may be provided as the seal member 6B. In the bridge expansion device 6 according to the fifth embodiment, the seal member 6B composed of a strip-shaped dry waterstop material having a rectangular cross-section is provided along the width direction (Y-axis direction) of the bridge girder 1.

[0045] As shown in FIG. 10, the seal member 6B includes an uneven adjustment portion 61, a support portion 62, a telescopic portion 63, a waterstop portion 64, and a dustproof portion 65. The uneven adjustment portion 61 is composed of a soft foam and is fixed to the side surfaces of the vertical plate portions 31B and 32C of the pair of face plates 3A facing each other in the X-axis direction, and absorbs the unevenness of the vertical plate portions 31B and 32C. The support portion 62 is composed of a waterstop single-cell foam and is provided inside the uneven adjustment portion 61 facing each other, and supports the vertical load (Z-axis direction) acting on the seal member 6B.

[0046] The telescopic part 63 is provided between a pair of opposing support parts 62. In the telescopic part 63, the first form 631 and the second form 632 are alternately arranged in the X-axis direction. Both the first form 631 and the second form 632 are composed of urethane foam. For example, the first form 631 is a soft urethane foam with a hardness (25%) of 60 N as defined in JIS K6400, and the second form 632 is composed of a hard urethane foam with a hardness (25%) of 125 N or more. The telescopic part 63 expands and contracts according to the expansion and contraction in the X-axis direction due to the thermal behavior of the bridge girder 1.

[0047] The water stop part 64 is provided so as to cover the upper surfaces of the uneven adjustment part 61, the support part 62, and the telescopic part 63. The water stop part 64 is composed of a water-impermeable material such as chloroprene rubber, and stops rainwater pouring onto the road surface of the bridge girder 1. The dust-proof part 65 is composed of polyethylene foam, is provided on the upper surface of the water stop part 64, and prevents dust on the road surface of the bridge girder 1 from entering. As the seal member 6B of the present embodiment, for example, Barrierflex manufactured by Nitto Co., Ltd. can be adopted.

[0048] Similar to the first embodiment, since the thickness dimension T2 of the joint plate part 32A of the face plate 3A is formed smaller than the thickness dimension T1 of the fixed plate part 32B, a larger space G3 can be secured below the vertical plate parts 31B and 32C accordingly. Therefore, as described above, even for the seal member 6B having a complex structure in which a plurality of members are combined, the seal member 6B can be installed in the space G3 below the vertical plate parts 31B and 32C without interfering with the steel floor plate 11.

[0049] (6) Other embodiments Note that the present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention. Other embodiments and variations made by those skilled in the art are also included in the present invention. In the above-described first embodiment, the case where the stud bolts 111 are fixed to the end portion of the steel floor slab 11 of the bridge girder 1 by welding or the like has been described. However, the present invention is not limited thereto. For example, a through hole is formed in the steel floor slab 11, a high-tensile bolt is inserted into the through hole, and the high-tensile bolt is provided as a stud bolt by screwing it with a nut or the like fixed to the lower surface of the steel floor slab 11. The fixing plate portion 32B of the bridge girder side joint plate 32 may be fixed to the stud bolt in the same manner as described above.

[0050] Also, in the above-described fourth and fifth embodiments, the case where the face plates 3A and 5A are provided in the clearance G1 between the bridge girder 1 and the abutment 2 has been described. However, the present invention is not limited thereto. For example, as shown in FIG. 5, the face plates 3A and 5A may be provided in the clearance G4 between the bridge girders 1. Further, as the bridge expansion devices 3, 4, 5, 6 provided in the clearance between a pair of opposing bridge girders or between an opposing bridge girder and the abutment, it is not necessary that both of the pair of joint plates have the configurations of the joint plates 32 and 52. At least one of the pair of joint plates may have the same configuration as the above-described joint plates 32 and 52.

[0051] In addition, as the seal member provided in the space between the upper surface of the floor board and the lower surface of the joint board portion, seal members 3B and 6B are applied, but the present invention is not limited thereto. For example, a seal member composed of a water stop material (such as an elastic water stop material or a dry water stop material) and a gutter may be applied. Also, although the case where the fixing plate portions 32B and 52B are provided on the steel floor board 11 of the bridge girder 1 has been described, the fixing plate portions 32B and 52B may be provided on various floor boards provided on the bridge abutment 2. Further, although the case where the fixing plate portions 32B and 52B are fixed with a plurality of filler plates 13 interposed on the upper surface of the steel floor board 11 protruding toward the clearance G1 side has been described, the present invention is not limited thereto. Depending on the situation at the construction site, one filler plate 13 may be interposed on the upper surface of the steel floor board 11 protruding toward the clearance G1 side to fix the fixing plate portions 32B and 52B, or the fixing plate portions 32B and 52B may be directly fixed on the upper surface of the steel floor board 11 protruding toward the clearance G1 side.

Explanation of Signs

[0052] 1 Bridge girder 2 Bridge abutment 3, 4, 5, 6 Expansion device for bridge 11 Steel floor board (floor board) 3A, 4A, 5A Face plate 3B, 6B Seal member 31, 32, 52 Joint plate 32A, 52A Joint board portion 32B, 52B Fixing plate portion 32C, 52C Vertical plate portion G1, G4 Clearance

Claims

1. A bridge expansion device provided in the clearance between a pair of opposing bridge girders or between an opposing bridge girder and a bridge abutment, comprising: a face plate having a pair of joint plates with opposing surfaces arranged to face each other with a gap therebetween; a seal member provided below the gap of the face plate; and among the pair of joint plates, at least one of the joint plates has a fixing plate portion fixed to the floor slab of the bridge girder; a joint plate portion integrally formed with the fixing plate portion, extending from the fixing plate portion toward the opposing surface of the other joint plate, and having an opposing surface that faces the opposing surface of the other joint plate with the gap therebetween; a vertical plate portion integrally formed on the lower surface of the joint plate portion and extending downward from the lower surface; and the joint plate portion is formed such that the thickness dimension from the opposing surface to the position where the vertical plate portion is provided is smaller than the thickness dimension of the fixing plate portion; the seal member is provided in the space between the vertical plate portion and the other joint plate formed below the joint plate portion; a bridge expansion device.

2. The seal member is an elastic waterstop material that fills the space between the vertical plate portion and the other joint plate with the waterstop material; The bridge expansion device according to Claim 1.

3. The seal member is provided non-adherently to the lower surface of the one joint plate portion and the lower surface of the other joint plate; The bridge expansion device according to Claim 2.

4. The fixing plate portion is fixed to the upper surface of the floor slab protruding toward the clearance side from the paving portion provided on the bridge girder or the bridge abutment with one or more filler plates interposed therebetween, the upper surfaces of the fixing plate portion and the joint plate portion in the height direction are adjusted to the height position of the upper surface of the paving portion of the bridge girder or the bridge abutment by the filler plates, the seal member is provided in the space between the upper surface of the floor slab and the lower surface of the joint plate portion; The bridge expansion device according to Claim 1.

5. The lower end of the vertical plate portion is disposed at the height position between the lower surface of the fixing plate portion and the floor slab, the fixing plate portion and the vertical plate portion support the joint plate portion in a cantilever manner; The bridge expansion device according to Claim 1.

6. The height direction distance from the upper surface of the floor slab to the lower surface of the joint plate portion is set to be greater than the height direction distance from the upper surface of the floor slab to the lower surface of the fixing plate portion; The bridge expansion device according to Claim 1.

7. A face plate of a bridge expansion device provided in the clearance between a pair of opposing bridge girders or between an opposing bridge girder and an abutment, having a pair of joint plates whose opposing faces are arranged to face each other with a gap therebetween, wherein at least one of the pair of joint plates, has a fixing plate portion fixed to the floor slab of the bridge girder, a joint plate portion integrally formed with the fixing plate portion, extending from the fixing plate portion toward the opposing face of the other joint plate, and having an opposing face facing the opposing face of the other joint plate with the gap therebetween, a vertical plate portion integrally formed on the lower surface of the joint plate portion and extending downward from the lower surface, and is provided with, the joint plate portion, is formed such that the thickness dimension from the opposing face to the position where the vertical plate portion is provided is smaller than the thickness dimension of the fixing plate portion, a seal member disposed below the gap is provided in the space between the vertical plate portion and the other joint plate, a face plate.

Images