Expansion joints for bridges

Abstract

To provide an expansion device for a bridge capable of reliably guiding leaking water flowing down along the inner surface of a joint web plate to a gutter part of a water cut-off member.SOLUTION: An expansion device for a bridge 1 comprises: a pair of joints 2 comprising a tabular faceplate 2A and a web plate 2B extending vertically downward from the faceplate 2A; and a water cut-off member 4 comprising an elastically deformable gutter part 4A curved in a U-shaped longitudinal section so as to bulge downward and a plate-like fixed part 4B connected to the upper parts of both ends in the width direction of the gutter part 4A, and being installed below the pair of joints 2 by attaching the fixed part 4B to the joints 2 respectively. The expansion device for a bridge is provided with guide means for guiding (leaking) water that flows down along the inner surface 2c of the web plate 2B of the joint 2 toward the center of the water cut-off member 4 in the width direction. The guide means is composed of a slope face 4F that slopes downward from the inner surface 2c of the web plate 2B of the joint 2 toward the center of the water cut-off member 4 in the width direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a bridge expansion device that is installed in the gap between bridge girders adjacent in the bridge axis direction or between a bridge girder and an abutment. [Background technology]

[0002] Bridges such as road bridges have expansion joints installed between adjacent girders in the bridge axis direction or between a girder and abutment. These expansion joints absorb the expansion and contraction of bridge girders due to temperature changes and deformation of bridge girders due to vehicle traffic, but they must be highly waterproof.

[0003] Therefore, for example, Patent Document 1 proposes an expansion device for a road bridge with a built-in water-stopping member as shown in FIGS.

[0004] 9 and 10 are longitudinal cross-sectional views showing conventional examples 1 and 2 of an expansion device for a road bridge with a built-in water-stopping member (hereinafter simply referred to as an "expansion device"). In the expansion device 101 shown in FIG. 9, a pair of joints 102 are provided at opposite ends across a gap S between bridge girders (not shown) that are adjacent in the bridge axis direction, and an elastic sealing material 103 as a primary water-stopping member and a water-stopping member 104 as a secondary water-stopping member are arranged above and below in the gap S on the underside of the face plates 102A of these joints 102.

[0005] Here, the elastic seal material 103 is an elastically deformable block-shaped member made of rubber or the like, and is attached to both joints 102 so as to cover the gap δ between the pair of joints 102 from below.

[0006] The water-stopping member 104, disposed below the elastic sealing material 103, is composed of a flexible gutter portion 104A that is curved in a U-shape in vertical cross section so that its widthwise center (hereinafter, the left-right direction in Figures 9 and 10 will be referred to as the "widthwise direction") bulges downward, and a flat fixing portion 104B that extends vertically downward and is connected to connecting portions 104a that are bent in an inverted U-shape on the widthwise outer side of the upper ends of the gutter portion 104A. The water-stopping member 104 is installed so as to cover the gap S from below by attaching both fixing portions 104B with rivets 106 to the inner surfaces 102C of the web plates 102B that extend vertically downward from the face plate 102A of each joint 102.

[0007] According to the above watertight structure, the elastic sealing material 103 primarily prevents the intrusion of water such as rainwater into the joint gap S from the gap δ between the pair of joints 102, but there is a risk that a gap will form between the elastic sealing material 103 and the web plate 102B of the joint 102 due to deterioration of the elastic sealing material 103. In this way, if a gap forms between the elastic sealing material 103 and the web plate 102B of the joint 102 and water leaks from the gap and flows down along the inner surface 102c of the web plate 102B, the leaking water will be received by the watertight member 104 and directed to the gutter portion 104A of the watertight member 104.

[0008] Here, the water stop structure has a gradient (transverse gradient) in the width direction (direction perpendicular to the plane of the paper in FIG. 9) that is perpendicular to the bridge axis direction of the expansion device 101, and a drainage pipe (not shown) connected to the drainage pipe is provided at the end of the expansion device 101, which is located at a low position. As a result, the gutter portion 104A of the water stop member 104 functions as a gutter that guides water leaking from the elastic sealing material 103 to the drainage pipe, and the leaked water flows through the gutter portion 104A along the gradient (transverse gradient) of the gutter portion 104A and is finally guided to a drainage pipe (not shown) and drained into the drainage pipe or the like.

[0009] 10, an elastic sealing material 203 serving as a primary waterproofing member and a waterproofing member 204 serving as a secondary waterproofing member are arranged above and below the gap S, and the waterproofing member 204 is composed of a gutter portion 204A having a U-shaped longitudinal cross section and flat fixing portions 204B extending horizontally outward from the upper ends of both widthwise ends of the gutter portion 204A. The waterproofing member 204 is arranged to cover the gap between both brackets 202C from below by attaching the fixing portions 204B with rivets 206 to the undersides 202e of brackets 202C that protrude horizontally from the inner surface 202c of the web plate 202B of each joint 202 toward the gap S.

[0010] With the above-mentioned water-stopping structure, as with the water-stopping structure shown in Figure 9, leaking water that penetrates from the gap δ between a pair of joints 202 into the gap between the elastic sealing material 203 and the bottom plate 202B of the joint 202 and flows down along the inner surface 202c of the bottom plate 202B is received by the water-stopping member 204, flows along the gradient (transverse gradient) of the gutter portion 204A of the water-stopping member 204, and is finally guided to a drainage pipe (not shown) provided at a position with a low gradient, such as the end of the water-stopping member 204, and is drained into a drainage pipe, etc. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Patent Application Publication No. 2019-120091 Summary of the Invention [Problem to be solved by the invention]

[0012] However, in the expansion device 101 shown in Figure 9, grooves x are formed between the connecting portions 104a, which have an inverted U-shaped cross section and are formed at the upper ends of the water-stopping member 104 in the width direction, and the web plate 102B of the joint 102. Therefore, water leaking from the gap between the elastic sealing material 103 and the web plate 102B of the joint 102 and flowing down the inner surface 102c of the web plate 102B flows into the grooves x. However, because the connecting portions 104a of the water-stopping member 104 actually function as a weir, the water cannot flow over the connecting portions 104a of the water-stopping member 104 and into the gutter 104A. Instead, the water flows along the gradient (transverse gradient) of the grooves x, preventing it from being guided from the gutter 104A to the drainage pipe. Furthermore, water that does not flow into the gutter 104A but flows into the grooves x may leak out from the ends of the water-stopping member 104, potentially causing rust on components below the ends of the water-stopping member 104.

[0013] Furthermore, in the expansion device 201 shown in Figure 10, water leaking from the gap between the elastic sealing material 203 and the web plate 202B of the joint 202 and flowing down along the inner surface 202c of the web plate 202B flows along the upper surface of the bracket 202C toward the gutter section 204A of the water-stopping member 204 if the expansion device 201 is installed in a location where there is no gradient in the bridge axis direction (longitudinal gradient) as shown in Figure 10(a).

[0014] However, as shown in Figure 10(a), even when the expansion device 201 is installed in a location where there is no gradient (longitudinal gradient) in the bridge axis direction, some of the water leaking out from the gap between the elastic sealing material 203 and the web plate 202B of the joint 202 flows along the gradient (transverse gradient) on the upper surface of the horizontal bracket 202C, and there is a risk that not all of the leaking water will be reliably guided to the gutter section 204A of the water-stopping member 204. Furthermore, as shown in Figure 10(b), when the expansion device 201 is installed in a location where there is a gradient (longitudinal gradient) in the bridge axis direction, the upper surface of the bracket 202C on the lower side (the right side of Figure 10(b)) slopes upward toward the gutter section 204A of the water-stopping member 204, and the leaking water that falls on the upper surface of this bracket 202C will not be able to flow into the gutter section 204A of the water-stopping member 204, resulting in the same problem as above. Furthermore, in the expansion device 201 shown in Figure 10(a), a step is formed at the boundary between the end face of the bracket 202C and the water-stopping member 204, as the side of the water-stopping member 204 protrudes from the end face of the bracket 202C toward the gap S on the center side in the width direction. This step may prevent leaking water from being reliably guided to the gutter portion 204A of the water-stopping member 204.

[0015] The present invention has been made in consideration of the above problems, and its object is to provide an expansion device for bridges that can reliably guide leaking water that flows down along the inner surface of the web of the joint into the gutter portion of the water-stopping member. [Means for solving the problem]

[0016] In order to achieve the above-mentioned object, the present invention provides a bridge expansion device that is installed in the gap between adjacent bridge girders in the bridge axis direction or between a bridge girder and an abutment, and is equipped with a face plate, a pair of joints having web plates extending downward from the face plate, an elastically deformable gutter section that bulges downward, a water-stopping member that is installed below the joints by having flat fixing parts connected to the upper ends of both widthwise ends of the gutter section and by attaching the fixing parts to each of the pair of joints, and guide means that guides water flowing down along the inner surface of the web plates of the joints toward the widthwise center of the water-stopping member.

[0017] Here, the guide means is composed of a slope that slopes downward from the inner surface of the web plate of the joint toward the center of the width of the water-stopping member, and the inclination angle of the slope is set larger than the longitudinal gradient of the bridge. [Effects of the Invention]

[0018] According to the present invention, water flowing down along the inner surface of the web of the joint can be reliably guided along the slope that constitutes the guide means to the gutter portion of the water-stopping member.

[0019] Here, if the inclination angle of the slope is set greater than the longitudinal gradient of the bridge, the slope will not slope upward toward the gutter portion of the water-stopping member, and water flowing down along the inner surface of the web of the joint will be reliably guided along the slope to the gutter portion of the water-stopping member. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a partial perspective view of a bridge on which a bridge expansion device according to a first embodiment of the present invention is installed. [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 3] 1 is a vertical cross-sectional view of a bridge expansion device according to a first embodiment of the present invention. [Figure 4] FIG. 4 is an enlarged detailed view of part D in FIG. 3. [Figure 5] FIG. 6 is a vertical cross-sectional view of a bridge expansion device according to a second embodiment of the present invention. [Figure 6] FIG. 10 is a vertical cross-sectional view of a bridge expansion device according to a modified example of the second embodiment of the present invention. [Figure 7] FIG. 10 is a vertical cross-sectional view of a bridge expansion device according to a third embodiment of the present invention. [Figure 8] FIG. 10 is a vertical cross-sectional view of a bridge expansion device according to a fourth embodiment of the present invention. [Figure 9] FIG. 1 is a longitudinal sectional view of a road bridge expansion device according to Conventional Example 1. [Figure 10] 10(a) and 10(b) are longitudinal cross-sectional views of a road bridge expansion device according to Conventional Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0022] <First Embodiment> FIG. 1 is a partial perspective view of a bridge on which a bridge expansion device according to embodiment 1 of the present invention is installed, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a longitudinal cross-sectional view of the same bridge expansion device, and FIG. 4 is an enlarged detailed view of part D in FIG. 3.

[0023] As shown in Figures 1 and 2, the bridge expansion device 1 according to this embodiment (hereinafter simply referred to as "expansion device") is a type with built-in watertight members that is installed in the gap S between bridge girders 50 adjacent in the bridge axis direction, and is composed of a pair of joints 2 provided at the opposing ends of each bridge girder 50, elastic sealing materials 3 as primary watertight members that are arranged above and below the gap S, and watertight members 4 as secondary watertight members.

[0024] The pair of joints 2 are metal components with an inverted L-shaped cross section extending in the width direction (the direction toward the front of the paper in Figure 2), perpendicular to the bridge axis direction. They consist of a plate-shaped front panel 2A located on the front side and a rectangular, flat web panel 2B extending vertically downward from the front panel 2A. Multiple (nine in the illustrated example) reinforcing anchor members (guide plates) 5 are attached to the back side of each joint 2 at appropriate intervals in the width direction. Furthermore, as shown in Figure 1, multiple rack-tooth-like convex portions 2a and concave portions 2b are alternately formed in the width direction on the opposing portions of the front panels 2A of both joints 2. Each convex portion 2a of one front panel 2A fits into each concave portion 2b of the other front panel 2A with a predetermined gap δ between them. Therefore, the expansion device 1 can absorb dimensional variations in the gap S by providing a predetermined gap δ between the front and rear panels 2A.

[0025] The elastic sealing material 3 is a component made of an elastically deformable material such as rubber and shaped like a rectangular block elongated in the width direction, and is arranged at the upper end of the gap S so as to cover the gap δ between the face plates 2A of both joints 2 from below, with both side surfaces in the width direction (left and right in Figure 2) adhered in close contact with the inner surface (the surface facing the gap S) 2c of the web plate 2B of each joint 2. The elastic sealing material 3 functions to prevent rainwater and the like from penetrating into the gap S through the gap δ between both joints 2, and also functions to absorb fluctuations in the gap δ caused by, for example, expansion and contraction of the bridge girder 50 due to changes in temperature, by its own elastic deformation.

[0026] The water-stopping member 4, which is a secondary water-stopping member, is a member that is long in the width direction and is placed below the elastic sealing material 3 in the gap S, and is composed of an elastically deformable gutter portion 4A that is curved in a U-shape in vertical cross section so that the center in the width direction bulges downward, and a fixing portion 4B that has an angular C-shaped cross section and is connected integrally to connecting portions 4a formed at the upper ends of the gutter portion 4A in the width direction and extends vertically downward. The water-stopping member 4 is obtained by integrating the gutter portion 4A made of a flexible elastic material (in this embodiment, soft polyvinyl chloride resin (soft PVC)) and the fixing portion 4B made of an elastic material that is harder than the gutter portion 4A (in this embodiment, hard polyvinyl chloride resin (hard PVC)) by two-color molding. The elastic material constituting the waterproofing member 4 may be polyvinyl chloride resin (PVC), chloroprene rubber (CR), ethylene propylene rubber (EPT), etc., but it is desirable to use a material with a JIS hardness of less than 70 for the gutter portion 4A and a material with a JIS hardness of 70 or more for the fixing portion 4B.

[0027] In this way, a harder elastic material is used for the fixing portion 4B of the waterstop member 4 than for the gutter portion 4A, and therefore the rigidity of the fixing portion 4B is increased, and the fixing portion 4B is not easily deformed by, for example, the weight of the gutter portion 4A or the water received by the gutter portion 4A, the expansion and contraction of the bridge girder 50 due to changes in temperature, deformation of the bridge girder 50 due to vehicle passage, etc. On the other hand, because the gutter portion 4A of the waterstop member 4 is made of a flexible elastic material, the gutter portion 4A can deform in response to, for example, the expansion and contraction of the bridge girder 50 due to changes in temperature and deformation of the bridge girder 50 due to vehicle passage, and damage to the waterstop member 4 due to the load applied thereto can be prevented.

[0028] In this embodiment, connecting portions 4a are formed by bending the upper ends of both widthwise ends of the gutter portion 4A outward in an arc shape, and the upper ends of the fixing portions 4B are integrally connected to the connecting portions 4a to form the water-stopping member 4. A protrusion 4d (see FIG. 4) protrudes from the inner surface 2c of the web panel 2B toward the gap S at the center of the widthwise direction and has a connecting portion 4a with a slope 4F integrally molded at its tip end. The protrusion 4d (see FIG. 4) protrudes integrally along the longitudinal direction (perpendicular to the plane of FIG. 4). The fixing portion 4B is made of a hard elastic material, and the presence of this protrusion 4d further increases its rigidity and maintains the angle θ (described below) of the slope 4F of the connecting portion 4a. In this embodiment, the protrusion 4d protrudes from the upper end of the fixing portion 4B at an angle θ, and the protrusion 4d also has a slope with an angle θ. In this embodiment, a protrusion 4c that protrudes toward the gap S on the widthwise center side (toward the widthwise center side of the gutter portion 4A) is integrally provided on the lower end (free end) of each fixing portion 4B of the water-stopping member 4 along the longitudinal direction (the direction perpendicular to the paper surface of FIGS. 3 and 4), and this protrusion 4c further increases the rigidity of each fixing portion 4B. In this way, the fixing portion 4B is provided with a protrusion 4d at the upper end and a protrusion 4c at the lower end, and is formed into an angular C-shaped (U-shaped) cross section, thereby increasing its rigidity.

[0029] The water-stopping member 4 configured as described above is positioned below the elastic sealing material 3 so as to cover the gap S from below by attaching each fixing portion 4B to each web plate 2B by driving a rivet 6, which is inserted from the inside into a circular insertion hole 4b (see Figure 4) formed in the fixing portion 4B from the inside, into a circular driving hole 2d (see Figure 4) formed in the web plate 2B of each joint 2, with the fixing portions 4B on both sides in the width direction being in tight contact with the inner surface 2c of the web plate 2B of each joint 2 via a sealing material not shown.

[0030] Furthermore, in this embodiment, rivets 6 are used as fasteners for attaching the fixing portions 4B of the waterstopping members 4 to the web plates 2B of each joint 2, so that the waterstopping members 4 can be fixed to the inner surface 2c of the web plate 2B simply by working from the inner surface 2c side, thereby improving the ease of attaching the waterstopping members 4. Here, for example, push rivets made of resin or drive rivets made of aluminum can be used as the rivets 6. Note that, in addition to the rivets 6, bolts and nuts can also be used as fasteners. In the expansion device 1, for example, driving holes 2d and insertion holes 4b into which fasteners such as rivets 6 are driven are provided at equal intervals in the longitudinal direction of the waterstopping members 4, and rivets 6 are attached to each of the driving holes 2d and insertion holes 4b.

[0031] In the expansion device 1 configured as described above, as shown in Figures 3 and 4, the upper portions of both widthwise ends of the gutter portion 4A of the water-stopping member 4 form connecting portions 4a that are bent outward in the widthwise direction, and the upper ends of the fixing portions 4B that are perpendicular to these connecting portions 4a are integrally connected, and the upper portions of both widthwise ends of the water-stopping member 4 (the connecting portions 4a of the gutter portion 4A and parts of the fixing portions 4B that are continuous therewith) have slopes 4F that form guide means.

[0032] As described below, the inclined surface 4F constitutes a guide means for guiding leaking water flowing down along the inner surface 2c of the web plate 2B of each joint 2 toward the widthwise center of the waterstop member 4 (the widthwise center of the gutter portion 4A). The inclined surface 4F is inclined downward from the inner surface 2c of the web plate 2B of each joint 2 toward the widthwise center of the waterstop member 4 by the angle θ shown in the figure (the angle from the planar direction B (FIG. 4) along the planar axis of the top plate 2A, which is perpendicular to the web plate 2B facing the widthwise direction (left-right direction in FIG. 2) of the joint 2). The inclination angle θ of the inclined surface 4F is set to be larger than the longitudinal gradient of the bridge (the gradient in the bridge axis direction). For example, if the longitudinal gradient of the bridge is large and set to 10% to 12%, the inclination angle θ of the inclined surface 4F is desirably set to 7° or more (θ≧7°). Note that FIGS. 3 and 4 show an example in which the expansion device 1 has almost no longitudinal gradient (0%), and the planar direction B is horizontal.

[0033] As shown in Figures 1 and 2, the expansion device 1 is installed in the gap S between adjacent bridge girders 50 in the bridge axis direction. Specifically, as shown in Figure 2, box-out sections 51a are formed at the opposing ends of a concrete deck 51 across the gap S, and the expansion device 1 is set in these box-out sections 51a, and post-placed concrete 52 is poured into the gap between the joint 2 of the box-out section 51a and the anchor member 5. Then, the expansion device 1 is securely installed in the gap S between the adjacent bridge girders 50, reinforced by the anchor member 5 and reinforcing bars (not shown). Finally, the installation work of the expansion device 1 is completed by laying asphalt 53 to a predetermined thickness on the top surface of the deck slab 51.

[0034] Next, the waterproofing effect of the expansion device 1 according to this embodiment will be described.

[0035] For example, during rainfall, rainwater attempts to seep into the gap S through the gap δ between the pair of joints 2 of the expansion device 1, but this rainwater intrusion is prevented by the elastic sealing material 3, which is the primary water-stopping member.

[0036] As described above, the elastic sealing material 3 prevents rainwater from penetrating into the gap S. However, if a gap occurs between the elastic sealing material 3 and the web plate 2B of the joint 2 due to deterioration in the durability of the elastic sealing material 3, rainwater will leak through this gap and flow down along the inner surface 2c of the web plate 2B of the joint 2 due to its own weight.

[0037] When the leaking water flowing down along the inner surface 2c of the web plate 2B of the joint 2 reaches the water-stopping member 4, which is a secondary water-stopping member, it is reliably guided along the slopes 4F serving as guide means provided at the upper ends of the water-stopping member 4 in the width direction to the gutter portion 4A of the water-stopping member 4, so that the leaking water is reliably drained without leaking out to the outside. In other words, the leaking water that has flowed into the gutter portion 4A of the water-stopping member 4 flows along the slope of the gutter portion 4A and is finally drained from a drainage pipe (not shown) into a drainage pipe or the like.

[0038] Furthermore, in this embodiment, the inclination angle θ of the slope 4F, which is the guide means, is set to a value greater than the longitudinal gradient of the bridge, so the slope 4F does not slope upward toward the gutter portion 4A of the water-stopping member 4. Therefore, leaking water flowing down along the inner surface 2c of the web plate 2B of the joint 2 is reliably guided along the slope 4F to the gutter portion 4A of the water-stopping member 4.

[0039] <Embodiment 2> Next, a second embodiment of the present invention will be described below with reference to FIG.

[0040] FIG. 5 is a longitudinal cross-sectional view of a bridge expansion device according to a second embodiment of the present invention. In this figure, the same elements as those shown in FIGS. 3 and 4 are designated by the same reference numerals, and further explanation of these elements will be omitted below.

[0041] In the expansion device 11 according to this embodiment, a bracket 2C is provided integrally with the pair of joints 2, protruding obliquely from the inner surface 2c of the web plate 2B toward the gap S, and a fixing portion 4B of a water-stopping member 4, which is a secondary water-stopping member, is attached to the underside 2e of each bracket 2C with a rivet 6.

[0042] Here, the upper surface of each bracket 2C forms a slope 2F that is inclined downward at the angle θ shown in the figure from the inner surface 2c of the web plate 2B of each joint 2 toward the widthwise center of the water-stopping member 4 (the widthwise center of the gutter section 4A), and this slope 2F constitutes a guide means for guiding leaking water that flows down along the inner surface 2c of the web plate 2B of the joint 2 toward the widthwise center of the water-stopping member 4 (the widthwise center of the gutter section 4A). Here, the inclination angle θ of the slope (upper surface) 2F of each bracket 2C is set to a value greater than the longitudinal gradient of the bridge for the reasons explained in the first embodiment above.

[0043] In this embodiment, the waterstop member 4 serving as the secondary waterstop member is composed of an elastically deformable gutter portion 4A that is curved in a U-shape in vertical cross section so that the widthwise center bulges downward, and flat fixing portions 4B that extend integrally outward in the widthwise direction from connecting portions 4a formed at the upper ends of both widthwise upper portions of the gutter portion 4A. The waterstop member 4 is disposed below the elastic sealing material 3 so as to cover the gap S from below by attaching each fixing portion 4B to the underside 2e of each bracket 2C by driving rivets 6 that pass through the insertion holes 4b (see FIG. 4) of the fixing portions 4B from below into the driving holes 2d of the bracket 2C of each joint 2, with the fixing portions 4B on both widthwise sides being in close contact with the underside 2e of each bracket 2C via a sealant not shown. In this embodiment, the water-stopping member 4 is also obtained by integrating, by two-color molding, a gutter portion 4A made of soft PVC and a fixing portion 4B made of hard PVC that is harder than the gutter portion 4A. A downwardly projecting protrusion 4d is integrally provided on the end of the fixing portion 4B of the water-stopping member 4 along the longitudinal direction (the direction perpendicular to the plane of the paper in FIG. 5), and a vertically extending connecting portion 4a is integrally molded at the lower end of the protrusion 4d.

[0044] As shown in FIG. 5, the protrusion 4d protrudes downward from the underside 2e of the bracket 2C such that the side surface of the protrusion 4d is aligned with the end face of the bracket 2C, and the side surface of the protrusion 4d does not protrude from the end face of the bracket 2C toward the gap S toward the widthwise center. Because the protrusion 4d does not protrude from the end face of the bracket 2C toward the gap S toward the widthwise center, there is no step at the boundary with the end face of the bracket 2C, and leaking water can be reliably guided to the gutter portion 4A of the water-stopping member 4. In this embodiment, as shown in FIG. 5, the side surface of the protrusion 4d and the end face of the bracket 2C are disposed substantially flush with each other. Here, "substantially flush" does not simply mean that the side surface of the protrusion 4d and the end face of the bracket 2C are physically on the same plane; it also allows for a deviation of approximately ±2 to 3 mm from the end face of the bracket 2C. Furthermore, it is not limited to a state in which the side surface of the protrusion 4d and the end surface of the bracket 2C are approximately flush with each other, and it is sufficient that there is no step protruding toward the gap S on the widthwise center side at the boundary between the protrusion 4d and the end surface of the bracket 2C. For example, the side surface of the protrusion 4d may be located widthwise outer than the end surface of the bracket 2C, and there may be no step protruding toward the gap S.

[0045] Even in the expansion device 11 configured as described above, if a gap occurs between the elastic sealing material 3 and the web plate 2B of the joint 2 due to factors such as deterioration in the durability of the elastic sealing material 3, rainwater will leak through this gap, and this leaked rainwater (leakage) will flow down the inner surface 2c of the web plate 2B due to its own weight, but this leaked water will be guided along the slopes 2F of each bracket 2C that constitutes the guide means to the gutter portion 4A of the water-stopping member 4, so the leaked water will be reliably drained without leaking out. In other words, the leaked water that has flowed into the gutter portion 4A of the water-stopping member 4 will flow along the slope of the gutter portion 4A and will eventually be drained from a drainage pipe (not shown) into a drainage pipe or the like.

[0046] Furthermore, in this embodiment, as in the first embodiment, the inclination angle θ of the slope 2F of the bracket 2C, which is the guide means, is set to be larger than the longitudinal gradient of the bridge, so that the slope 2F does not slope upward toward the gutter portion 4A of the water-stopping member 4, and leaking water flowing down along the inner surface 2c of the web plate 2B of the joint 2 is reliably guided along the slope (upper surface) 2F of the bracket 2C to the gutter portion 4A of the water-stopping member 4.

[0047] The above effects can be achieved as long as the upper surface of each bracket 2C is a slope 2F. For example, as shown in FIG. 6, the lower surface 2e of each bracket 2C may be a flat surface along the planar direction B (see FIG. 4). In this case, the fixing portion 4B of the water-stopping member 4 is attached to the lower surface 2e of the bracket 2C, allowing the fastener, rivet 6, to be driven into the bracket 2C from directly below with good workability. Note that, like the protrusion 4d in FIG. 5 described above, the protrusion 4d shown in FIG. 6 has a side surface that protrudes downward from the lower surface 2e of the bracket 2C so as to follow the end surface of the bracket 2C, and the side surface of the protrusion 4d does not protrude from the end surface of the bracket 2C toward the gap S on the widthwise center side.

[0048] <Third Embodiment> Next, a third embodiment of the present invention will be described below with reference to FIG.

[0049] FIG. 7 is a longitudinal cross-sectional view of a bridge expansion device according to a third embodiment of the present invention. In this figure, the same elements as those shown in FIG. 5 are given the same reference numerals, and further explanation of these elements will be omitted below.

[0050] The basic configuration of the extension device 21 according to this embodiment is the same as that of the extension device 11 according to the second embodiment shown in Figure 5, but differs from the extension device 11 according to the second embodiment shown in Figure 5 in that the connection part 4a formed at the upper end of the gutter part 4A of the waterstop member 4, which is the secondary waterstop member, is curved in the shape of an arcuate curved surface and bent outward in the width direction. In addition, the end of the fixing part 4B extending in the width direction is integrally formed with the connection part 4a of the gutter part 4A.

[0051] In the expansion device 21 according to this embodiment, leakage water that leaks from the elastic sealing material 3 and flows down along the inner surface 2c of the web plate 2B of the joint 2 is guided along the sloped surfaces (upper surfaces) 2F of each bracket 2C that constitutes the guide means to the gutter portion 4A of the water-stopping member 4, so that the leakage water is reliably drained without leaking out to the outside. In other words, the leakage water that flows into the gutter portion 4A of the water-stopping member 4 flows along the slope of the gutter portion 4A and is finally drained from a drainage pipe (not shown) into a drainage pipe or the like.

[0052] Furthermore, in this embodiment, as in the first and second embodiments, the inclination angle θ of the slope 2F of the bracket 2C, which is the guide means, is set to be larger than the longitudinal gradient of the bridge, so that the slope 2F does not slope upward toward the gutter portion 4A of the water-stopping member 4, and therefore, leaking water flowing down along the inner surface 2c of the web plate 2B of the joint 2 is reliably guided along the slope 2F to the gutter portion 4A of the water-stopping member 4.

[0053] In addition to the above effects, in this embodiment, by curving the connection parts 4a formed at the upper ends of both widthwise ends of the water-stopping member 4 into an arc-shaped curve, the water-stopping member 4 can more easily deform (follow) the expansion and contraction in the widthwise direction of the expansion device 21 due to the contraction of the bridge girder, which in turn makes it possible to suppress the occurrence of stress concentration at the connection parts 4a, thereby also achieving the effect of increasing the durability of the water-stopping member 4 as a whole.

[0054] In this embodiment as well, it is sufficient that the upper surface of each bracket 2C is an inclined surface 2F, and for example, the lower surface 2e of each bracket 2C may be a flat surface along the surface direction B (see FIG. 4), as shown in Fig. 6. In this case, the fixing portion 4B of the water-stopping member 4 is attached to the flat lower surface 2e of the bracket 2C, so that the rivet 6, which is a fastener, can be driven into the bracket 2C from directly below with good workability.

[0055] <Fourth Embodiment> Next, a fourth embodiment of the present invention will be described below with reference to FIG.

[0056] FIG. 8 is a longitudinal cross-sectional view of a bridge expansion device according to a fourth embodiment of the present invention. In this figure, the same elements as those shown in FIGS. 3 to 7 are given the same reference numerals, and further explanation of these elements will be omitted below.

[0057] In the expansion device 31 according to this embodiment, the tip of the bracket 2D that protrudes integrally from the inner surface 2c of the web plate 2B of each joint 2 toward the widthwise center of the gap S is bent vertically downward, and the fixing portion 4B of the water-stopping member 4, which has a U-shaped cross section, is attached to the outer surface 2f of the bent vertical portion 2D1 with a rivet 6. Note that although the sloping upper surface of each bracket 2D and the inner surface of the vertical portion 2D1 may be connected by a surface shape such as an angle, in this embodiment, the sloping upper surface of each bracket 2D and the inner surface of the vertical portion 2D1 are smoothly connected by a circular arc curved surface (R curved surface).

[0058] Here, the upper surface of each bracket 2D is a slope 2F that is inclined downward at the angle θ shown in the figure from the inner surface 2c of the web plate 2B of the joint 2 toward the widthwise center of the water-stopping member 4 (the widthwise center of the gutter section 4A), and this slope 2F constitutes a guide means for guiding leaking water that flows down along the inner surface 2c of the web plate 2B of the joint 2 toward the widthwise center of the water-stopping member 4 (the widthwise center of the gutter section 4A). Note that the inclination angle θ of the slope (upper surface) 2F of the bracket 2D is set to a value greater than the longitudinal gradient of the bridge for the reasons mentioned above.

[0059] In this embodiment, the water-stopping member 4 serving as the secondary water-stopping member is made up of an elastically deformable gutter portion 4A that is curved in a U-shape in vertical cross section so that the widthwise center bulges downward, and flat fixing portions 4B that extend upward integrally from the upper ends of both widthwise ends of the gutter portion 4A, with protrusions 4c integrally formed on the upper ends of each fixing portion 4B toward the outside in the widthwise direction to increase the rigidity of the fixing portion 4B. Note that in this embodiment as well, the water-stopping member 4 is obtained by integrating the gutter portion 4A made of soft PVC and the fixing portion 4B made of hard PVC that is harder than the gutter portion 4A by two-color molding.

[0060] In the expansion device 31 configured as above, similarly to the expansion devices 1, 11, and 21 according to the first to third embodiments, leaking water that leaks from the elastic sealing material 3 and flows down along the inner surface 2c of the web plate 2B of the joint 2 is guided along the slopes 2F on the upper surfaces of the brackets 2D that constitute the guide means to the gutter portion 4A of the water-stopping member 4, so that the leaking water is reliably drained without leaking out to the outside. In other words, the leaking water that has flowed into the gutter portion 4A of the water-stopping member 4 flows along the slope of the gutter portion 4A and is finally drained from a drainage pipe (not shown) into a drainage pipe or the like.

[0061] Furthermore, in this embodiment, as in the first to third embodiments, the inclination angle θ of the slope 2F on the upper surface of the bracket 2D, which is the guide means, is set to be larger than the longitudinal gradient of the bridge, so that the slope 2F does not slope upward toward the gutter portion 4A of the water-stopping member 4, and therefore, leaking water flowing down along the inner surface 2c of the web plate 2B of the joint 2 is reliably guided along the slope 2F to the gutter portion 4A of the water-stopping member 4.

[0062] In addition to the above effects, in this embodiment, both fixing portions 4B of the water-stopping member 4 are attached to the outer surface 2f of the vertical portion 2D1 of each bracket 2D with rivets 6, so that the rivets 6 can be driven in with good workability in an approximately horizontal direction from the outside. Furthermore, since the direction in which the weight of the water-stopping member 4 itself or the leaking water flowing into the gutter portion 4A of the water-stopping member 4 acts (vertically downward) is not the direction in which the rivets 6 will come out (approximately horizontally outward), the rivets 6 are prevented from coming out and the water-stopping member 4 is securely attached to the bracket 2D.

[0063] While the above has described an embodiment in which the present invention is applied to an expansion device installed in the gap between adjacent bridge girders in the bridge axis direction, the present invention can also be applied to an expansion device installed in the gap between a bridge girder and an abutment.

[0064] Furthermore, the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims and the technical concept described in the specification and drawings. For example, in the above-described embodiments, the plate-shaped surface panels 2A of the pair of joints 2 may be inclined in the bridge axis direction, and the gutter portion of the water-stopping member may have a V-shaped vertical cross section or a box-shaped cross section with an open upper end. Furthermore, the gutter portion 4A and the fixing portion 4B of the water-stopping member 4 may be integrated by a method other than two-color molding.

[0065] In the above-described embodiment, the surface plate 2A is formed with a plurality of rack-tooth-shaped convex portions 2a and concave portions 2b alternately formed in the width direction, but the present invention is not limited to this. For example, a surface plate with linear gaps rather than alternating convex portions 2a and concave portions 2b in the width direction may be used. Furthermore, in an extension device, surface plates of various shapes may be used, such as a sliding type surface plate in which a surface plate connected to one web plate is placed on top of a surface plate connected to the other web plate with a gap, and surface plates extending from the opposing web plates on one and the other sides are stacked one on top of the other with a gap between them.

[0066] Furthermore, in the above-described embodiment, for example, a case has been described in which the driving holes 2d and the insertion holes 4b into which fasteners such as rivets 6 are driven are arranged at equal intervals along the longitudinal direction of the water-stopping member 4, but the present invention is not limited to this, and the driving holes 2d and the insertion holes 4b may be arranged irregularly along the longitudinal direction of the water-stopping member 4.

[0067] Furthermore, in the above-described embodiment, a rectangular flat web panel 2B extending vertically downward integrally from the surface panel 2A is used as the web panel extending downward from the surface panel, but the present invention is not limited to this, and web panels of various shapes, such as a tapered shape (trapezoidal shape) instead of a rectangular flat shape, may be used.

[0068] Furthermore, in the above-described embodiment, a rectangular block-shaped elastic sealing material 3 that is elongated in the width direction is used as the elastic sealing material. However, the present invention is not limited to this, and elastic sealing materials having various shapes, such as a trapezoidal shape, may also be used. [Explanation of symbols]

[0069] 1,11,21,31 Bridge expansion device 2. Joints 2A joint faceplate 2B joint web 2C, 2D joint bracket 2D1 Vertical part of bracket 2F, 4F slope (guide means) 2a Convex part of joint 2b Recess of joint 2c Inner surface of the web 2d Web plate mounting holes 2e Underside of bracket 2f Outer surface of the vertical part of the bracket 3 Elastic sealing material 4. Water-stopping materials 4A Gutter part of water-stopping material 4B Water-stopping member fixing part 4a Connection of water-stopping material 4b Water-stopping member insertion hole 4c Protrusion of water-stopping material 5 Anchor member 6 Rivets 50 Bridge girders S Yuma δ Gap between joints θ Inclination angle of the slope

Claims

1. A bridge expansion device installed in the gap between adjacent bridge girders in the bridge axis direction or between a bridge girder and an abutment, a pair of joints each including a surface plate and a web extending downward from the surface plate; a water-stopping member including a gutter portion that is elastically deformable and bulges downward, and flat fixing portions connected to upper portions of both ends of the gutter portion in the width direction, the fixing portions being attached to the pair of joints, respectively, thereby being installed below the joints; a guide means for guiding water flowing down along the inner surface of the web of the joint toward the widthwise center of the water-stopping member; Equipped with the guide means is formed of a slope that slopes downward from the inner surface of the web plate of the joint toward the center of the water-stopping member in the width direction, and the slope angle is set to be larger than the longitudinal gradient of the bridge, upper portions of both widthwise ends of the gutter portion of the water-stopping member form connecting portions bent outward in the widthwise direction, the fixing portions perpendicular to the connecting portions are connected, and the fixing portions are attached to the inner surface of the web plate of the joint, and the slopes are formed at the upper portions of both widthwise ends of the water-stopping member, The water-stopping member is formed by integrating the gutter portion made of a flexible elastic material with the fixing portion made of an elastic material harder than the gutter portion, and the upper end of the fixing portion has a protrusion that protrudes from the inner surface of the web plate toward the center in the width direction and along the longitudinal direction, and the connecting portion having the slope is integrally molded at the tip end of the protrusion. Expansion device for bridges.

2. A bridge expansion device installed in the gap between adjacent bridge girders in the bridge axis direction or between a bridge girder and an abutment, a pair of joints each including a surface plate and a web extending downward from the surface plate; a water-stopping member including a gutter portion that is elastically deformable and bulges downward, and flat fixing portions connected to upper portions of both ends of the gutter portion in the width direction, the fixing portions being attached to the pair of joints, respectively, thereby being installed below the joints; a guide means for guiding water flowing down along the inner surface of the web of the joint toward the widthwise center of the water-stopping member; Equipped with the guide means is formed of a slope that slopes downward from the inner surface of the web plate of the joint toward the center of the water-stopping member in the width direction, and the slope angle is set to be larger than the longitudinal gradient of the bridge, The fixing portion of the water-stopping member is attached to a rectangular flat bracket that is long in a direction perpendicular to the bridge axis direction and that is protruded from the inner surface of the web plate of the joint, and the upper surface of the bracket is the inclined surface, The fixing portion of the water-stopping member extends linearly outward in the width direction from a connecting portion formed at an upper end of the gutter portion of the water-stopping member, and is attached to a lower surface of the bracket of the joint. Expansion device for bridges.

3. 3. The bridge expansion and contraction device according to claim 2, wherein the connecting portion formed at the upper end of the gutter portion of the water-stopping member is curved in the shape of a circular arc.

4. The bridge expansion and contraction device according to any one of claims 1 to 3, wherein the water-stopping member is an integral part of the gutter portion made of a flexible elastic material and the fixing portion made of an elastic material harder than the gutter portion.

5. 5. A bridge expansion and contraction device according to claim 4, wherein a projection is integrally formed on the free end of said fixed portion along the longitudinal direction.

6. The bridge expansion device according to any one of claims 1 to 5, wherein the fixing portion is attached to the joint by a rivet.

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