Device for connecting bridge members and bridge

Abstract

To provide a device for connecting bridge members that can be applied to bridge members whose outer surfaces are made of stainless steel while suppressing galvanic corrosion.SOLUTION: A device for connecting two bridge members includes a high-strength bolt 26, a connecting member 12 having a first connecting portion and a second connecting portion, the first connecting portion connecting one of the two bridge members and the second connecting portion connecting the other of the two bridge members, thereby connecting the two bridge members, and a mounting plate 22 made of clad steel 24 having a clad material 24B made of stainless steel and a base material 24A made of carbon steel, to which at least one of the first connecting portion and the second connecting portion of the connecting member 12 is attached. The mounting plate 22 is configured to be fixed to at least one of the two bridge members by the high-strength bolt 26 with the outer surface of the stainless steel in contact with the outer surface of the bridge member.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a bridge member-to-bridge member connecting device and a bridge, and more particularly to a bridge member-to-bridge member connecting device that connects two bridge members and limits the relative positional relationship between the two bridge members to within a predetermined range, and a bridge to which the bridge member-to-bridge member connecting device is applied. [Background technology]

[0002] At the Tedorigawa Bridge on the Hokuriku Expressway, work is underway to replace the PC continuous box girder bridge, which was damaged by salt damage, with an eight-span continuous steel open-section box girder bridge (with a precast PC deck at the top) (see Non-Patent Document 1). The Tedorigawa Bridge is located approximately 50 m from the coast (see Non-Patent Document 2), in an environment where there is severe salt damage and where abrasion due to blown sand is a concern, and for the first time in Japan, stainless clad steel, with a 1.5 mm thick stainless steel coating on the surface of the steel girders, has been used for the bridge (see Non-Patent Document 1).

[0003] After the replacement, the Tedorigawa Bridge will be an eight-span continuous steel open-section box girder bridge, and the bridge's total length of approximately 550m is planned to be made up of a single box girder welded together, and no bridge fall prevention device will be used to connect adjacent girders. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] "NEXCO Central Japan adopts stainless clad steel for the first time in Japan to replace Tedorigawa Bridge," Road Structure Journal NET, Published: December 1, 2023, [Retrieved January 11, 2024]<https: / / www.kozobutsu-hozen-journal.net / walks / 39565 / > ,<https: / / www.kozobutsu-hozen-journal.net / walks / 39565 / ?spage=2> [Non-patent document 2] "A major project to build a '100-year bridge' is underway on the Hokuriku Expressway! A close look at the massive construction of the Tedori River Bridge, involving over 10,000 people," FNN Prime Online, August 16, 2023, [Retrieved January 11, 2024].<https: / / www.fnn.jp / articles / - / 570612> Summary of the Invention [Problem to be solved by the invention]

[0005] Bridges using stainless clad steel, with the stainless steel clad steel cladding material located on the outer surface of the girders (hereinafter referred to as clad steel bridges), are expected to be adopted in other coastal areas as well, given their excellent corrosion resistance. As mentioned above, the rebuilt Tedorigawa Bridge, which uses stainless clad steel, is planned to be constructed with a single box girder welded together for the entire length of the bridge, approximately 550 m, and no bridge fall prevention devices connecting adjacent girders will be used. However, it is unclear whether clad steel bridges that will be constructed in other coastal areas in the future will be able to be designed with a single box girder integrated along the entire length of the bridge, as with the rebuilt Tedorigawa Bridge. The inventors believe that in future clad steel bridges using stainless clad steel, it will be necessary to use bridge fall prevention devices connecting adjacent bridge girders or bridge girders to abutments.

[0006] Furthermore, the mounting plates and reinforcing plates of current bridge fall prevention devices are made of carbon steel, and the inventors have considered that if current bridge fall prevention devices are used on clad steel bridges that use stainless clad steel, there is a risk of problems with galvanic corrosion occurring.

[0007] The present invention has been made in consideration of the above points, and aims to provide a bridge member-to-member connecting device that can be applied to bridge members whose outer surfaces use stainless steel while suppressing galvanic corrosion, and a bridge to which the bridge member-to-member connecting device is applied. [Means for solving the problem]

[0008] The present invention is an invention that solves the above-mentioned problems, and provides a connecting device between bridge members and a bridge to which the connecting device between bridge members is applied, as described below.

[0009] That is, a first aspect of the connection device between bridge members according to the present invention is a connection device for connecting two bridge members, comprising: a connecting member having a high-strength bolt, a first connecting portion and a second connecting portion, the first connecting portion connecting one of the two bridge members and the second connecting portion connecting the other of the two bridge members, thereby connecting the two bridge members; and a mounting plate to which at least one of the first connecting portion and the second connecting portion of the connecting member is attached, the mounting plate being made of clad steel with stainless steel cladding and carbon steel as a base material, wherein the mounting plate is configured to be fixed to at least one of the two bridge members by the high-strength bolt, with the outer surface of the stainless steel in contact with the outer surface of the bridge member.

[0010] Here, in this application, a bridge component refers to a component that constitutes part of a bridge, and typically refers to a bridge girder that is part of the superstructure of the bridge, and an abutment or pier that is part of the substructure of the bridge, etc. The same interpretation shall be applied to other descriptions in this application.

[0011] Furthermore, the term "connecting member used to connect the two bridge members" includes not only cases where the connecting member is used to connect the two bridge members by directly contacting them, but also cases where the connecting member is used to indirectly connect the two bridge members via another member.

[0012] Furthermore, the phrase "at least one of the first connecting portion and the second connecting portion of the connecting member is attached to the mounting plate" includes not only the case where at least one of the first connecting portion and the second connecting portion of the connecting member is attached to the mounting plate by directly contacting the mounting plate, but also the case where at least one of the first connecting portion and the second connecting portion of the connecting member is indirectly attached to the mounting plate via another member. This should be interpreted similarly in similar descriptions elsewhere in this application.

[0013] A second aspect of the connecting device between bridge members according to the present invention is the connecting device between bridge members of the first aspect, characterized in that the mounting plate has a first mounting plate and a second mounting plate, the first mounting plate is fixed to one of the two bridge members, and the second mounting plate is fixed to the other of the two bridge members, and the connecting member is configured so that the first connecting portion is attached to the first mounting plate and the second connecting portion is attached to the second mounting plate.

[0014] A third aspect of the bridge member connecting device according to the present invention is a connecting device between bridge members of the first or second aspect, characterized in that the mounting plate has an epoxy resin coating on its edge surface.

[0015] Here, the "edge surface" of the mounting plate refers to the side surface (the end surface of the side portion of the mounting plate) excluding the top and bottom surfaces of the mounting plate. This shall be interpreted similarly in similar descriptions elsewhere in this application.

[0016] A fourth aspect of the bridge member connecting device according to the present invention is a connecting device between bridge members according to any one of the first to third aspects, characterized in that the mounting plate has a coating film containing 60 wt% or more of an anti-rust pigment on the surface opposite to the surface that contacts the outer surface of the bridge member.

[0017] A fifth aspect of the connecting device between bridge members according to the present invention is the connecting device between bridge members of the fourth aspect, characterized in that the anti-corrosive pigment is zinc.

[0018] A sixth aspect of the connection device according to the present invention is a connection device for connecting two bridge members, comprising: a connection member having a high-strength bolt, a first connection portion, and a second connection portion, the connection member being used to connect the two bridge members by connecting the first connection portion to one of the two bridge members and the second connection portion to the other of the two bridge members; a mounting plate to which at least one of the first connection portion and the second connection portion of the connection member is attached; and a reinforcing plate made of clad steel with stainless steel cladding and carbon steel base material, which is arranged between the mounting plate and the bridge member to which the mounting plate is attached, wherein the mounting plate is configured to be fixed to at least one of the two bridge members by the high-strength bolt via the reinforcing plate, the outer surface of which is in contact with the outer surface of at least one of the two bridge members.

[0019] A seventh aspect of the connection device between bridge members according to the present invention is the connection device between bridge members of the sixth aspect, further comprising: first high-strength bolts and second high-strength bolts as the high-strength bolts; a first attachment plate of the attachment plates to which the first connecting portion of the connecting member is attached; a second attachment plate of the attachment plates to which the second connecting portion of the connecting member is attached; a first reinforcing plate made of clad steel with stainless steel cladding and carbon steel base material, which is disposed between the first attachment plate and one of the two bridge members to which the first attachment plate is fixed; and a second reinforcing plate disposed between the second attachment plate and the other of the two bridge members to which the second attachment plate is fixed. and a second reinforcing plate made of clad steel with stainless steel cladding and carbon steel base material, wherein the first mounting plate is configured to be fixed to one of the two bridge members by the first high-strength bolts via the first reinforcing plate arranged so that the stainless steel outer surface of the first reinforcing plate contacts the outer surface of one of the two bridge members, and the second mounting plate is configured to be fixed to the other of the two bridge members by the second high-strength bolts via the second reinforcing plate arranged so that the stainless steel outer surface of the second reinforcing plate contacts the outer surface of the other of the two bridge members.

[0020] An eighth aspect of the bridge member connecting device according to the present invention is a connecting device between bridge members of the sixth or seventh aspect, characterized in that the reinforcing plate has an epoxy resin coating on its edge surface.

[0021] A ninth aspect of the bridge member connecting device according to the present invention is a connecting device between bridge members according to any one of the sixth to eighth aspects, characterized in that the reinforcing plate has a coating film containing 60 wt% or more of an anti-rust pigment on the surface opposite to the surface that contacts the outer surface of the bridge member.

[0022] A tenth aspect of the connecting device between bridge members according to the present invention is the connecting device between bridge members of the ninth aspect, characterized in that the anti-corrosive pigment is zinc.

[0023] An eleventh aspect of the connecting device between bridge members according to the present invention is a connecting device between bridge members of any of the first to tenth aspects, characterized in that the high-strength bolts are treated with a zinc-free anti-rust treatment.

[0024] A first aspect of the bridge according to the present invention is a bridge to which a bridge member-to-bridge member connection device according to any one of the first, third to fifth, or eleventh aspects (excluding those having the configuration of a bridge member-to-bridge member connection device according to any one of the second, sixth, or seventh aspects) is applied, wherein one of the two bridge members is a stainless steel bridge girder configured so that the outer surface is stainless steel, and the other of the two bridge members is a substructure that supports the stainless steel bridge girder from below, and wherein the mounting plate is fixed to the stainless steel bridge girder with the high-strength bolts so that the stainless steel outer surface of the mounting plate is in contact with the outer surface of the stainless steel bridge girder, and the connecting member is attached at the first connecting portion to the mounting plate fixed to the stainless steel bridge girder, and the second connecting portion is connected to the substructure.

[0025] A second aspect of the bridge according to the present invention is a bridge according to the first aspect, characterized in that the stainless steel bridge girder has clad steel with a stainless steel cladding material and a carbon steel base material, and is configured so that the stainless steel cladding material forms the outer surface.

[0026] A third aspect of the bridge according to the present invention is a bridge according to the first or second aspect, characterized in that the outer surface of the cladding material of the mounting plate itself is unpainted, and the portion of the outer surface of the stainless steel bridge girder that comes into contact with the unpainted outer surface is also unpainted.

[0027] A fourth aspect of the bridge according to the present invention is a bridge to which the bridge member connection device of any of the second to fifth or eleventh aspects (limited to those having the configuration of the bridge member connection device according to the second aspect) is applied, in which the two bridge members are two stainless steel bridge girders configured so that their outer surfaces are stainless steel, arranged side by side with their longitudinal directions connected in the bridge axis direction; the first mounting plate is fixed to one of the two stainless steel bridge girders with the high-strength bolts so that the stainless steel outer surface of the first mounting plate contacts the outer surface of one of the two stainless steel bridge girders; the second mounting plate is fixed to the other stainless steel bridge girder with the high-strength bolts so that the stainless steel outer surface of the second mounting plate contacts the outer surface of the other of the two stainless steel bridge girders; and the connecting member is characterized in that the first connecting portion is attached to the first mounting plate fixed to one of the two stainless steel bridge girders, and the second connecting portion is attached to the second mounting plate fixed to the other of the two stainless steel bridge girders.

[0028] A fifth aspect of the bridge according to the present invention is a bridge according to the fourth aspect, characterized in that the two stainless steel bridge girders both have clad steel with stainless steel cladding and carbon steel base material, and are configured so that the stainless steel cladding is the outer surface.

[0029] A sixth aspect of the bridge according to the present invention is a bridge of the fourth or fifth aspect, characterized in that the outer surfaces of the cladding materials of both of the two mounting plates are unpainted, and the portions of the outer surfaces of the corresponding stainless steel bridge girders that come into contact with the unpainted outer surfaces are also unpainted.

[0030] A seventh aspect of the bridge according to the present invention is a bridge to which a bridge member connection device of any of the sixth and eighth to eleventh aspects (excluding those having the configuration of the bridge member connection device according to any of the first, second, and seventh aspects) is applied, wherein one of the two bridge members is a stainless steel bridge girder configured so that the outer surface is stainless steel, and the other of the two bridge members is a substructure that supports the stainless steel bridge girder from below, and wherein the mounting plate is fixed to the stainless steel bridge girder by the high-strength bolts via the reinforcing plate that is arranged so that the stainless steel outer surface of the reinforcing plate contacts the outer surface of the stainless steel bridge girder, and the connecting member is attached to the mounting plate at the first connecting portion and connected to the substructure at the second connecting portion.

[0031] An eighth aspect of the bridge according to the present invention is a bridge according to the seventh aspect, characterized in that the stainless steel bridge girder has clad steel with a stainless steel cladding material and a carbon steel base material, and is configured so that the stainless steel cladding material forms the outer surface.

[0032] A ninth aspect of the bridge according to the present invention is a bridge of the seventh or eighth aspect, characterized in that the outer surface of the cladding material of the reinforcing plate itself is unpainted, and the portion of the outer surface of the stainless steel bridge girder that comes into contact with the unpainted outer surface is also unpainted.

[0033] A tenth aspect of the bridge according to the present invention is a bridge to which a bridge member connection device of any of the seventh to eleventh aspects (limited to those having the configuration of the bridge member connection device according to the seventh aspect) is applied, in which the two bridge members are two stainless steel bridge girders configured so that their outer surfaces are stainless steel, adjacent to each other with their longitudinal direction connected in the bridge axis direction, and the first mounting plate is fixed to one of the two stainless steel bridge girders by the first high-tension bolts via the first reinforcing plate arranged so that the stainless steel outer surface of the first reinforcing plate contacts the outer surface of one of the two stainless steel bridge girders, and the second mounting plate is fixed to the other of the two stainless steel bridge girders by the second high-tension bolts via the second reinforcing plate arranged so that the stainless steel outer surface of the second reinforcing plate contacts the outer surface of the other of the two stainless steel bridge girders, and the first connecting portion of the connecting member is attached to the first mounting plate, and the second connecting portion of the connecting member is attached to the second mounting plate.

[0034] An eleventh aspect of the bridge according to the present invention is a bridge according to the tenth aspect, characterized in that the two stainless steel bridge girders both have clad steel with stainless steel cladding and carbon steel base material, and are configured so that the stainless steel cladding is the outer surface.

[0035] A twelfth aspect of the bridge according to the present invention is a bridge of the tenth or eleventh aspect, characterized in that the outer surfaces of the cladding materials of both of the two reinforcing plates are unpainted, and the portions of the outer surface of the stainless steel bridge girder with which the unpainted outer surfaces of the two reinforcing plates contact are also unpainted. [Effects of the Invention]

[0036] According to the present invention, it is possible to provide a bridge member-to-bridge member connecting device that can be applied to bridge members whose outer surfaces are made of stainless steel while suppressing galvanic corrosion, and a bridge to which the bridge member-to-bridge member connecting device is applied. [Brief explanation of the drawings]

[0037] [Figure 1] 1A and 1B are diagrams schematically illustrating a bridge member-to-bridge connecting device 10 according to a first embodiment of the present invention and a bridge 2 (box girder bridge) according to the first embodiment to which the bridge member-to-bridge connecting device 10 is applied, in which (A) is a diagrammatic view of the bridge 2 as seen from a direction perpendicular to the bridge axis, and (B) is a diagrammatic view of the bridge 2 as seen from the bridge axis direction. [Figure 2] 1 is a plan view of an upper fixing portion 20 of the connecting device 10 between bridge members according to the first embodiment of the present invention (a view of the upper fixing portion 20 of the connecting device 10 between bridge members in FIG. 1 as seen from below). [Figure 3] 1 is a side view of the upper anchoring portion 20 of the bridge member connecting device 10 according to the first embodiment of the present invention (a view of the upper anchoring portion 20 of the bridge member connecting device 10 in FIG. 1 from a direction perpendicular to the bridge axis of the bridge 2). [Figure 4] 1A and 1B are diagrams schematically illustrating a bridge member-to-bridge connecting device 10 according to a first embodiment of the present invention and a bridge 4 (plate girder bridge) according to a modified example of the first embodiment to which the bridge member-to-bridge connecting device 10 is applied, in which (A) is a diagrammatic view of the bridge 4 as seen from a direction perpendicular to the bridge axis, and (B) is a diagrammatic view of the bridge 4 as seen from the bridge axis direction. [Figure 5] 1 is a diagram showing a bridge member-to-bridge connecting device 14 according to a second embodiment of the present invention and a bridge 6 (plate girder bridge) according to the second embodiment to which the bridge member-to-bridge connecting device 14 is applied, as viewed from a direction perpendicular to the bridge axis of the bridge 6. [Figure 6] 10 is a diagram showing a bridge member-to-bridge member connecting device 18 according to a third embodiment of the present invention and a bridge 8 according to the third embodiment to which the bridge member-to-bridge member connecting device 18 is applied, as viewed from a direction perpendicular to the bridge axis of the bridge 8. [Figure 7]1A and 1B are diagrams schematically illustrating a bridge member-to-bridge member connecting device 19 according to a fourth embodiment of the present invention and a bridge 9 (box girder bridge) according to the fourth embodiment to which the bridge member-to-bridge connecting device 19 is applied, in which (A) is a diagrammatic view of the bridge 9 as seen from a direction perpendicular to the bridge axis, and (B) is a diagrammatic view of the bridge 9 as seen from the bridge axis direction. [Figure 8] 7 is a plan view of an upper fixing portion 50 of a connecting device 19 between bridge members according to a fourth embodiment of the present invention (a view of the upper fixing portion 50 of the connecting device 19 between bridge members in FIG. 7 as seen from below). [Figure 9] 7 is a side view of the upper anchoring portion 50 of the bridge member-to-bridge member connecting device 19 according to the fourth embodiment of the present invention (a view of the upper anchoring portion 50 of the bridge member-to-bridge member connecting device 19 in FIG. 7 from a direction perpendicular to the bridge axis of the bridge 9). [Figure 10] This is a diagram showing the corrosion condition at the inside corner C3 when the mounting plate 100 of a conventional bridge fall prevention device is attached to the bottom flange 72 of the box girder 70, as seen from the direction perpendicular to the bridge axis (high-strength bolts, connecting members, etc. are omitted). DETAILED DESCRIPTION OF THE INVENTION

[0038] Hereinafter, a connecting device between bridge members according to an embodiment of the present invention will be described in detail with reference to the drawings, with the bridge fall prevention device used on a bridge in mind in the description, although the application of the present invention is not limited to bridge fall prevention devices used on bridges.

[0039] (1) A bridge member connecting device and a bridge according to a first embodiment of the present invention FIG. 1 is a diagram schematically illustrating a bridge member-to-bridge connecting device 10 according to a first embodiment of the present invention and a bridge 2 (box girder bridge) according to the first embodiment to which the bridge member-to-bridge connecting device 10 is applied, in which FIG. 1(A) is a diagrammatic view of the bridge 2 as viewed from a direction perpendicular to the bridge axis, and FIG. 1(B) is a diagrammatic view of the bridge 2 as viewed from the bridge axis direction. FIG. 2 is a plan view of the upper anchoring portion 20 of the bridge member-to-bridge connecting device 10 according to the first embodiment of the present invention (a diagram of the upper anchoring portion 20 of the bridge member-to-bridge connecting device 10 in FIG. 1 as viewed from below), and FIG. 3 is a side view of the upper anchoring portion 20 of the bridge member-to-bridge connecting device 10 according to the first embodiment of the present invention (a diagram of the upper anchoring portion 20 of the bridge member-to-bridge connecting device 10 in FIG. 1 as viewed from a direction perpendicular to the bridge axis of the bridge 2). In Fig. 1(B), in order to simplify the drawing and make it easier to understand, only the upper anchoring portion 20 of the bridge member connecting device 10 is shown, and other portions are omitted, as well as the bearing 77. Also in Fig. 1, reference numeral 78 denotes a deck slab provided above the box girder 70.

[0040] The box girder 70, which is the superstructure of the bridge 2 according to the first embodiment to which the bridge member-to-member connection device 10 according to the first embodiment is applied, is a stainless steel bridge girder configured to have clad steel 74, with a base material 74A made of carbon steel and a cladding material 74B made of stainless steel, with the stainless steel cladding material 74B located on the outer surface of the box girder 70. The stainless steel cladding material 74B is located on the outer surface of the box girder 70 facing the outside, and the carbon steel base material 74A faces the inside of the box girder 70. Furthermore, a zinc-rich coating film 30 is applied to the surface of the carbon steel base material 74A (the inner surface of the box girder 70). Therefore, the box girder 70 exhibits excellent corrosion resistance even in a salt-damaged environment affected by the ocean.

[0041] The bridge member-to-bridge connecting device 10 according to the first embodiment of the present invention comprises an upper anchoring portion 20, a connecting cable 12, and a lower anchoring portion 60, and the bridge 2 according to the first embodiment of the present invention is a bridge (box girder bridge) to which the bridge member-to-bridge connecting device 10 is applied. The upper anchoring portion 20 is an anchoring portion attached to the superstructure of the bridge 2, and is attached to the underside of the lower flange 72 of a box girder 70, which is the superstructure of the bridge 2. The lower anchoring portion 60 is an anchoring portion attached to the substructure of the bridge 2, and is attached near the upper side of an abutment 76, which is the substructure of the bridge 2.

[0042] As shown in FIG. 1, bridge 2 is a box girder bridge having a box girder 70 as one main girder, with three upper anchoring portions 20 attached to the underside of the lower flange 72 of box girder 70 at predetermined intervals in the direction perpendicular to the bridge axis. Three lower anchoring portions 60 corresponding to the three upper anchoring portions 20 are attached near the upper part of the side of abutment 76, and the corresponding upper anchoring portions 20 and lower anchoring portions 60 are each connected by connecting cables 12. Therefore, bridge 2 according to this first embodiment is provided with three bridge member-to-bridge member connecting devices 10 according to this first embodiment. In addition, a deck slab 78 is provided above box girder 70.

[0043] The upper anchorage 20 and the lower anchorage 60 are firmly connected by a connecting cable 12, and the bridge member connecting device 10 limits the distance between the upper anchorage 20 and the lower anchorage 60 so that it does not exceed a predetermined value. By having this function, the bridge member connecting device 10 prevents the box girder 70 from falling off the support 77 on the top of the abutment 76 in the event of a major earthquake, causing the bridge to collapse, and the bridge member connecting device 10 functions as a bridge collapse prevention device.

[0044] The upper fixing portion 20 is composed of a mounting plate 22, high-strength bolts 26, etc. The upper fixing portion 20 is a fixing portion that is attached to the superstructure of the bridge 2, and as described above, is attached to the underside of the lower flange 72 of the box girder 70, which is the superstructure of the bridge 2. The lower flange 72 of the box girder 70 is made of clad steel 74, with the base material 74A being carbon steel and the cladding material 74B being stainless steel, and the cladding material 74B, which is stainless steel, is arranged on the outer surface (i.e., the underside of the lower flange 72) of the lower flange 72 of the box girder 70 to which the upper fixing portion 20 is attached.

[0045] The lower anchoring part 60 is an anchoring part that is attached to the substructure of the bridge 2, and as mentioned above, is attached near the upper side of the abutment 76, which is the substructure of the bridge 2. The lower anchoring part 60 can be fixed to the abutment 76 using a conventional, well-known method, for example, it can be fixed to the concrete abutment 76 using an anchor. The lower anchoring part 60 and the connecting cable 12 can also be connected to each other using a conventional, well-known method.

[0046] The mounting plate 22 is made of clad steel 24, with a base material 24A made of carbon steel and a cladding material 24B made of stainless steel, and is attached to the outer surface of the object to be attached (here, the underside of the bottom flange 72 of the box girder 70) by closely contacting the outer surface with the stainless steel cladding material 24B as the attachment surface. The outer surface of the cladding material 24B of the mounting plate 22 is stainless steel, which has excellent corrosion resistance, so the attachment surface of the mounting plate 22 (outer surface of the cladding material 24B) is unpainted. Furthermore, the outer surface of the box girder 70 where the mounting plate 22 is attached is also made of stainless steel and is unpainted.

[0047] In the bridge member-to-bridge member connecting device 10 according to the first embodiment and the bridge 2 according to the first embodiment to which it is applied, the outer surface of the cladding material 24B (stainless steel) of the mounting plate 22 is attached in close face-to-face contact with the outer surface of the lower flange 72 of the box girder 70 (the outer surface of the cladding material 74B (stainless steel) of the clad steel 74), but because both contacting metals are stainless steel, galvanic corrosion does not occur.

[0048] The standard thickness of the mounting plate 22 (clad steel 24) is 22 mm or more and 50 mm or less. The corrosion resistance of the mounting plate 22 improves as the thickness of the clad material 24B (stainless steel) of the clad steel 24 that makes up the mounting plate 22 becomes thicker, but the cost increases as the thickness of the clad material 24B (stainless steel) becomes thicker, so the standard thickness of the clad material 24B (stainless steel) of the mounting plate 22 is 0.5 mm or more and 8 mm or less, preferably 0.75 mm or more and 6 mm or less, and more preferably 1 mm or more and 5 mm or less.

[0049] The mounting plate 22 is attached to the object to be attached (in this first embodiment, the lower flange 72 of the box girder 70) by bringing the outer surface of the cladding material 24B (stainless steel) of the mounting plate 22 into close contact with the outer surface of the object to be attached (in this first embodiment, the lower surface of the lower flange 72 of the box girder 70) and friction-joining it using the tightening force of the high-strength bolts 26.

[0050] The edge (side) of the mounting plate 22 is painted with an epoxy resin paint and protected from corrosion by an epoxy resin coating 28, as shown in Figure 3. It is possible to use a corrosion-protective coating other than the epoxy resin coating 28 on the edge (side) of the mounting plate 22, but as a general rule, zinc-containing coatings (such as zinc-rich coatings) are not used to protect the edge (side) of the mounting plate 22 from corrosion. This is because stainless steel is significantly more noble than carbon steel, and if zinc comes into contact with stainless steel, it may be lost in a short period of time due to galvanic corrosion. Furthermore, if welding or heat bending is performed around the stainless steel while zinc is in contact with the stainless steel, the heat may cause zinc embrittlement cracking in the stainless steel.

[0051] Since the mounting plate 22 uses clad steel 24 with stainless steel cladding 24B, even if the epoxy resin coating 28 peels off at the inside corner C1 (see Figure 3) between the outer surface (lower surface) of the bottom flange 72 of the box girder 70 and the edge of the mounting plate 22, the carbon steel base material 24A of the mounting plate 22 (clad steel 24) will not be exposed as long as the peeling does not exceed the thickness of the stainless steel cladding 24B, and corrosion of the base material 24A is prevented. On the other hand, the mounting plate 100 of a conventional bridge fall prevention device is made of carbon steel 102, and as shown in Figure 10, the distance between the carbon steel 102 of the conventional mounting plate 100 and the cladding material 74B (stainless steel) of the bottom flange 72 of the box girder 70 is only the thickness of the corrosion-resistant coating 104, and the carbon steel 102 of the mounting plate 100 and the cladding material 74B (stainless steel) of the bottom flange 72 of the box girder 70 are close to each other. For this reason, when a conventional bridge fall prevention device is attached to the outer surface (underside) of the bottom flange 72 of the box girder 70, if the anticorrosive coating 104 peels off at the inside corner C3 (see Figure 10) between the outer surface (underside) of the bottom flange 72 of the box girder 70 and the edge surface of the conventional mounting plate, there is a risk that galvanic corrosion will occur and the corrosion will progress. In Figure 10, the corroded area 106 that is expected to occur as corrosion progresses at the inside corner C3 is shown by a two-dot chain line.

[0052] Furthermore, when a conventional mounting plate 100 is used, the anticorrosive coating 104 is interposed between the carbon steel 102 of the mounting plate 100 and the cladding material 74B (stainless steel) of the bottom flange 72 of the box girder 70, and therefore, when a high-strength bolt friction joint is performed, there is a risk that the tightening force of the high-strength bolt will decrease due to creep of the interposed anticorrosive coating 104. On the other hand, in the mounting plate 22 of the bridge member coupling device 10 according to the first embodiment, as described above, the mounting surface of the mounting plate 22 (the outer surface of the cladding material 24B) is unpainted, and also the outer surface of the box girder 70 at the location where the mounting plate 22 is attached in the bridge 2 according to the first embodiment to which the bridge member coupling device 10 is applied is unpainted, so no anticorrosive coating is present between the mounting surface of the mounting plate 22 (the outer surface of the cladding material 24B) and the outer surface of the cladding material 74B (stainless steel) of the bottom flange 72 of the box girder 70. Therefore, in the bridge 2 to which the bridge member-to-bridge member connecting device 10 according to the first embodiment is applied, there is no risk of the tightening force of the high-strength bolt 26 being reduced due to creep of the anticorrosive coating film present between the mounting plate 22 and the box girder 70.

[0053] However, since a zinc-rich coating film 30 is present on the outer surface (the outer surface opposite the cladding material 24B) of the carbon steel base material 24A of the mounting plate 22 as shown in Figure 3, the zinc-rich coating film 30 is present between the heads 26A of the high-strength bolts 26 and the outer surface of the base material 24A of the mounting plate 22, and the zinc-rich coating film 30 is also present between the nuts 26B of the high-strength bolts 26 and the upper surface of the bottom flange 72 of the box girder 70. The compressive force of the high-strength bolts 26 acts on these zinc-rich coating films 30, which may cause creep. However, since the zinc-rich coating film 30 has excellent creep resistance, there is little risk that the tightening force of the high-strength bolts 26 will be reduced due to creep of the zinc-rich coating film 30. The higher the zinc content in the zinc-rich coating 30, the better the creep resistance and corrosion prevention performance. Therefore, from the viewpoint of creep resistance and corrosion prevention performance, the zinc content in the zinc-rich coating 30 is preferably 60 wt% or more, and more preferably 70 wt% or more. Even in corrosion-resistant coatings other than zinc-rich coatings, the higher the content of the rust-preventive pigment contained, the better the creep resistance and corrosion prevention performance. Therefore, even when a corrosion-resistant coating other than the zinc-rich coating 30 is applied to the outer surface of the carbon steel base material 24A of the mounting plate 22 (the outer surface opposite the cladding material 24B), from the viewpoint of creep resistance and corrosion prevention performance, the content of the rust-preventive pigment in the corrosion-resistant coating is preferably 60 wt% or more, and more preferably 70 wt% or more. Examples of rust-preventive pigments other than zinc include aluminum and zinc phosphate.

[0054] High-strength bolts 26 can be those conventionally used for friction joining, but it is preferable to use bolts that have been treated with rust prevention in order to prevent stress corrosion cracking due to hydrogen embrittlement. However, since the objects to be fastened with high-strength bolts 26 include cladding material 24B and cladding material 74B, which are stainless steel, if zinc is used in the rust prevention treatment of high-strength bolts 26, there is a risk that the zinc will be lost in a short period of time due to galvanic corrosion and that the stainless steel will suffer zinc embrittlement cracking. Therefore, in principle, zinc-containing bolts are not used in the rust prevention treatment of high-strength bolts 26.

[0055] To further improve the corrosion resistance of rust-proofed high-strength bolts, the rust-proofed high-strength bolts can be further painted with epoxy resin paint, polyurethane resin paint, fluororesin paint, or the like. It is preferable to further apply these paints to rust-proofed high-strength bolts. It is also possible to use high-strength bolts that have not been rust-proofed as the high-strength bolts 26. In this case, however, the inner surfaces of the high-strength bolt through-holes in the clad steel 24 of the mounting plate 22 and the inner surfaces of the high-strength bolt through-holes in the clad steel 74 of the bottom flange 72 of the box girder 70 must be painted in advance to prevent galvanic corrosion, and the high-strength bolts must be painted with epoxy resin paint, polyurethane resin paint, fluororesin paint, or the like after installation.

[0056] The connecting cable 12 is a cable that firmly connects the upper anchorage part 20 and the lower anchorage part 60. As the connecting cable 12, a known cable that is currently used in bridge fall prevention devices can be used, such as a PC steel strand.

[0057] The connecting cable 12 can be connected to the upper anchorage 20 using a known connecting method used in conventional bridge fall prevention devices. The bridge member-to-member connecting device 10 according to the first embodiment is configured so that force can be transmitted between the connecting cable 12 and the mounting plate 22 of the upper anchorage 20 via the components (vertical plate 32, support plate 34, etc.) shown in FIG. 3. If the box girder 70 moves in the bridge axis direction of the bridge 2 during a major earthquake, causing the upper anchorage 20 to move away from the lower anchorage 60, the connecting cable 12 will be pulled via the vertical plate 32, support plate 34, etc., and tension will be generated in the connecting cable 12 whose other end is connected to the lower anchorage 60. The bridge member-to-member connecting device 10 according to the first embodiment limits the distance between the upper anchorage 20 and the lower anchorage 60 to a predetermined distance or less, thereby achieving bridge fall prevention.

[0058] The method of connecting the connecting cable 12 to the upper anchorage 20 (the method of transmitting force between the connecting cable 12 and the mounting plate 22 of the upper anchorage 20) will now be described in more detail. In the bridge member-to-member connection device 10 according to the first embodiment, the vertical plate 32 is fixed perpendicularly to the outer surface of the base material 24A of the mounting plate 22. A partition plate 46, attached to the outer surface of the base material 24A of the mounting plate 22, is further attached to the surface of the vertical plate 32 near the center of the connecting cable 12, allowing it to resist the tension of the connecting cable 12 applied to the vertical plate 32 (the tension of the connecting cable 12 that occurs when the upper anchorage 20 moves in a direction away from the lower anchorage 60). A flat 36 attached to one end of the connecting cable 12 has a threaded outer surface with a nut 38 attached, and the tension of the connecting cable 12 is transmitted to the support plate 34 via the nut 38. Coil springs 42 and rubber buffers 40 are disposed between the support plate 34 and the vertical plate 32, and the tension of the connecting cable 12 transmitted to the support plate 34 is smoothly transmitted to the vertical plate 32 via the coil springs 42 and rubber buffers 40. The vertical plate 32, which is supported by the partition plate 46 from the side closer to the center of the connecting cable 12, transmits the tension of the connecting cable 12 together with the partition plate 46 to the mounting plate 22. The mounting plate 22 is firmly fixed to the box girder 70 with high-strength bolts 26, and the other end of the connecting cable 12 is connected to the lower anchorage 60. Therefore, if the box girder 70 moves in the bridge axis direction of the bridge 2 during a major earthquake and the upper anchorage 20 moves away from the lower anchorage 60, tension is generated in the connecting cable 12, and the bridge member-to-bridge connecting device 10 according to the first embodiment limits the distance between the upper anchorage 20 and the lower anchorage 60 to a predetermined distance or less, thereby preventing the bridge from collapsing.

[0059] 2 and 3, a protective cover 44 is a cover that protects the members 34, 36, 38, 40, and 42 in the end region of the connecting cable 12, and a guide block 48 is a member that guides the extending direction of the connecting cable 12 in an appropriate direction.

[0060] In addition, unless the surface condition is specifically specified in the above explanation, it is standard practice to paint the surface of each component of the upper fixing section 20 with zinc-rich paint or epoxy resin paint before transporting it to the site.

[0061] Furthermore, after the on-site installation of the upper fixing part 20 is completed, the outer surfaces of each component of the upper fixing part 20 can be further painted with epoxy resin paint, polyurethane resin paint, fluororesin paint, etc. To further improve corrosion resistance, at least one of epoxy resin paint, polyurethane resin paint, fluororesin paint, acrylic silicone resin paint, and ultra-thick film epoxy resin paint can be further painted on top of the epoxy resin paint or polyurethane resin paint.

[0062] The above describes the bridge member-to-bridge connecting device 10 according to the first embodiment and the bridge 2 (box girder bridge) according to the first embodiment to which the bridge member-to-bridge connecting device 10 is applied. However, the bridge to which the bridge member-to-bridge connecting device 10 according to the first embodiment can be applied is not limited to box girder bridges. For example, as shown in FIG. 4, the bridge member-to-bridge connecting device 10 according to the first embodiment can also be applied to a plate girder bridge. FIG. 4 is a schematic diagram showing the bridge member-to-bridge connecting device 10 according to the first embodiment of the present invention and a bridge 4 (plate girder bridge) according to a modified example of the first embodiment to which the bridge member-to-bridge connecting device 10 is applied. FIG. 4(A) is a schematic diagram of the bridge 4 as viewed from a direction perpendicular to the bridge axis, and FIG. 4(B) is a schematic diagram of the bridge 4 as viewed from the bridge axis direction. Note that in FIG. 4(B), in order to simplify the drawing and make it easier to understand, only the upper anchoring portion 20 of the bridge member-to-bridge connecting device 10 is shown, and other parts are omitted, as well as the bearing 86.

[0063] As shown in FIG. 4 , the bridge 4 according to the modification of the first embodiment is a plate girder bridge having three plate girders 80. An upper anchoring portion 20 is attached to the underside of the lower flange 82 of each plate girder 80. The plate girders 80 are stainless steel bridge girders made of clad steel with a carbon steel base material and a stainless steel clad material, with the stainless steel clad material located on the outer surface of the plate girders 80. Three lower anchoring portions 60 corresponding to the three upper anchoring portions 20 are attached near the upper side of the abutment 84, and the corresponding upper anchoring portions 20 and lower anchoring portions 60 are each connected by a connecting cable 12. Therefore, the bridge 4 according to the modification of the first embodiment is provided with three bridge member-to-bridge member connecting devices 10. In addition, a deck 88 is provided above the three plate girders 80.

[0064] (2) A bridge member connecting device and a bridge according to a second embodiment of the present invention 5 is a diagram schematically illustrating a connecting device 14 between bridge members according to a second embodiment of the present invention and a bridge 6 (plate girder bridge) according to the second embodiment to which the connecting device 14 is applied, as viewed from a direction perpendicular to the bridge axis of the bridge 6. In the bridge 6 according to the second embodiment, the plate girder 80, the lower flange 82, the abutment 84, the bearing 86, and the deck 88 are the same as those in the bridge 4 according to the modified example of the first embodiment.

[0065] In the bridge member connection device 10 according to the first embodiment, a connection cable 12 (e.g., PC steel strand) is used as the connecting member connecting the upper anchorage 20 and the lower anchorage 60. However, in the present invention, the connecting member connecting the upper anchorage (anchoring to the upper structural member) and the lower anchorage (anchoring to the lower structural member) is not limited to a cable member. In the bridge member connection device 14 according to the second embodiment, a connection chain 16 is used as the connecting member connecting the upper anchorage 21 and the lower anchorage 62. Apart from this and related points, the bridge member connection device 14 according to the second embodiment is the same as the bridge member connection device 10 according to the first embodiment. Therefore, except for the content described below, the explanation of the bridge member connection device 10 according to the first embodiment will generally be used to explain the bridge member connection device 14 according to the second embodiment.

[0066] The connecting chain 16 is a chain that firmly connects the upper anchoring portion 21 and the lower anchoring portion 62. As the connecting chain 16, a known chain that is currently used in bridge fall prevention devices can be used.

[0067] The connecting chains 16 can be connected to the upper anchoring portion 21 and the lower anchoring portion 62 by known connecting methods used in conventional bridge fall prevention devices.

[0068] The mounting plate and high-strength bolts of the upper anchoring portion 21 can be the same as the mounting plate 22 and high-strength bolts 26 of the upper anchoring portion 20 of the bridge member-to-bridge member connecting device 10 according to the first embodiment.

[0069] The lower anchoring portion 62 can be fixed to the abutment 84 by a conventional known method, for example, by using an anchor to fix it to the concrete abutment 84.

[0070] (3) A third embodiment of the present invention relates to a connecting device between bridge members and a bridge 6 is a diagram schematically illustrating a connecting device 18 between bridge members according to a third embodiment of the present invention and a bridge 8 according to the third embodiment to which the connecting device 18 is applied, as viewed from a direction perpendicular to the bridge axis of the bridge 8. In FIG. 6, reference numeral 94 denotes a support provided between the top end of a pier 92 and a bridge girder 90.

[0071] The bridge member connection device 10 according to the first embodiment is a connection device that connects a box girder 70, which is the superstructure of the bridge 2, to an abutment 76, which is the substructure of the bridge 2, and the bridge member connection device 14 according to the second embodiment is a connection device that connects a plate girder 80, which is the superstructure of the bridge 6, to an abutment 84, which is the substructure of the bridge 4. However, the bridge member connection device 18 according to the third embodiment is a connection device that connects two adjacent bridge girders 90, as shown in FIG. 6, so that their ends are located above piers 92 and their longitudinal directions are aligned in the bridge axis direction of the bridge 8, and is a connection device that connects superstructure members together. The bridge girder 90 is a stainless steel bridge girder that includes clad steel with a carbon steel base material and stainless steel clad material, and is configured so that the stainless steel clad material is located on the outer surface of the bridge girder 90.

[0072] The two anchoring points used to connect the two bridge girders 90 are both similar to the upper anchoring points 20 of the bridge member-to-bridge member connecting device 10 of the first embodiment, and the connecting member used to connect the two bridge girders 90 is similar to the connecting cable 12 of the bridge member-to-bridge member connecting device 10 of the first embodiment, so the explanation of the bridge member-to-bridge member connecting device 10 of the first embodiment will be used in place of the explanation of the bridge member-to-bridge member connecting device 18 of the third embodiment.

[0073] (4) A fourth embodiment of the present invention relates to a connecting device between bridge members and a bridge 7A and 7B are diagrams schematically showing a bridge member-to-bridge connecting device 19 according to a fourth embodiment of the present invention and a bridge 9 (box girder bridge) according to the fourth embodiment to which the bridge member-to-bridge connecting device 19 is applied, in which FIG. 7A is a diagram of the bridge 9 as viewed from a direction perpendicular to the bridge axis, and FIG. 7B is a diagram of the bridge 9 as viewed from the bridge axis direction. FIG. 8 is a plan view of the upper anchoring portion 50 of the bridge member-to-bridge connecting device 19 according to the fourth embodiment of the present invention (a diagram of the upper anchoring portion 50 of the bridge member-to-bridge connecting device 19 as viewed from below in FIG. 7), and FIG. 9 is a side view of the upper anchoring portion 50 of the bridge member-to-bridge connecting device 19 according to the fourth embodiment of the present invention (a diagram of the upper anchoring portion 50 of the bridge member-to-bridge connecting device 19 as viewed from a direction perpendicular to the bridge axis of the bridge 9 in FIG. 7). In Figure 7(B), in order to simplify the drawing and make it easier to understand, only the upper fixing portion 50 of the bridge member-to-member connecting device 19 is shown, and other parts are omitted, and the support 77 is also omitted.

[0074] In the bridge member-to-member connecting device 10 according to the first embodiment, the mounting plate 22 of the upper fixing portion 20 is made of clad steel 24, with the base material 24A being carbon steel and the cladding material 24B being stainless steel, and the outer surface of the stainless steel cladding material 24B is used as the mounting surface, and is attached by closely contacting the surface to the underside of the lower flange 72 of the box girder 70, which is the object to be attached.However, in the upper fixing portion 50 of the bridge member-to-member connecting device 19 according to the fourth embodiment, a reinforcing plate 52 is interposed between the mounting plate 56 and the underside of the lower flange 72 of the box girder 70. Apart from this and related points, the bridge member connection device 19 according to the fourth embodiment and the bridge 9 according to the fourth embodiment to which the bridge member connection device 19 is applied are similar to the bridge member connection device 10 and the bridge 2 according to the first embodiment. Therefore, except for the content described below, the explanation of the bridge member connection device 10 and the bridge 2 according to the first embodiment will, in principle, replace the explanation of the bridge member connection device 19 and the bridge 9 according to the fourth embodiment. Corresponding members are given the same reference numerals and their explanations will, in principle, be omitted. Note that the box girder 70, which is the superstructure of the bridge 9 according to the fourth embodiment to which the bridge member connection device 19 according to the fourth embodiment is applied, is the same as the box girder 70 of the bridge 2 according to the first embodiment. It is a stainless steel bridge girder configured to have clad steel 74 with a base material 74A of carbon steel and a clad material 74B of stainless steel, with the stainless steel clad material 74B located on the outer surface of the box girder 70.

[0075] A connecting device 19 between bridge members according to the fourth embodiment of the present invention comprises an upper anchoring portion 50, a connecting cable 12, and a lower anchoring portion 60. The upper anchoring portion 50 is an anchoring portion attached to the superstructure of the bridge 9, and is attached to the underside of a lower flange 72 of a box girder 70, which is the superstructure of the bridge 9. The lower anchoring portion 60 is an anchoring portion attached to the substructure of the bridge 9, and is attached near the upper side of an abutment 76, which is the substructure of the bridge 9.

[0076] The upper anchorage 50 and the lower anchorage 60 are firmly connected by a connecting cable 12, and the bridge member connecting device 19 limits the distance between the upper anchorage 50 and the lower anchorage 60 so that it does not exceed a predetermined value. By having this function, the bridge member connecting device 19 prevents the box girder 70 from falling off the support 77 on the top of the abutment 76 in the event of a major earthquake, causing the bridge to collapse, and the bridge member connecting device 19 functions as a bridge collapse prevention device.

[0077] The upper fixing portion 50 is composed of a reinforcing plate 52, a mounting plate 56, and high-strength bolts 57, 58, etc. The upper fixing portion 50 is a fixing portion that is attached to the superstructure of the bridge 9, and as described above, is attached to the underside of the lower flange 72 of the box girder 70, which is the superstructure of the bridge 9. The lower flange 72 of the box girder 70 is made of clad steel 74, with the base material 74A being carbon steel and the cladding material 74B being stainless steel, and the cladding material 74B, which is stainless steel, is arranged on the outer surface of the lower flange 72 of the box girder 70 to which the upper fixing portion 50 is attached (i.e., the underside of the lower flange 72).

[0078] The lower anchoring part 60 is an anchoring part that is attached to the substructure of the bridge 9, and as described above, is attached near the upper side of the abutment 76, which is the substructure of the bridge 9. The lower anchoring part 60 can be fixed to the abutment 76 using a conventional known method, for example, it can be fixed to the concrete abutment 76 using an anchor. The lower anchoring part 60 can also be connected to the connecting cable 12 using a conventional known method.

[0079] The reinforcing plate 52 is a component that is installed to ensure that the stainless steel surface of the clad steel bridge body comes into contact with the stainless steel surface of the bridge member connection device 19 (the stainless steel surface of the reinforcing plate 52, which is stainless clad steel) in order to avoid contact between dissimilar metals when the bridge member connection device 19 is applied to a clad steel bridge, and by using the reinforcing plate 52, it becomes possible to use current bridge fall prevention devices, which use carbon steel for the mounting plate, on clad steel bridges while avoiding contact between dissimilar metals. The reinforcing plate 52 also serves as a reinforcing component.

[0080] The reinforcing plate 52 is made of clad steel 54, with a base material 54A made of carbon steel and a cladding material 54B made of stainless steel, and is attached to the outer surface of the object to be attached by closely contacting the outer surface of the object to which it is attached, with the outer surface of the stainless steel cladding material 54B serving as the attachment surface. The outer surface of the cladding material 54B of the reinforcing plate 52 is stainless steel, which has excellent corrosion resistance, so the attachment surface of the reinforcing plate 52 (the outer surface of the cladding material 54B) is left unpainted. In addition, the outer surface of the box girder 70 where the reinforcing plate 52 is attached is also made of stainless steel and left unpainted.

[0081] In the bridge member-to-bridge connecting device 19 according to the fourth embodiment and the bridge 9 according to the fourth embodiment to which it is applied, the outer surface of the cladding material 54B (stainless steel) of the reinforcing plate 52 is attached in close face-to-face contact with the outer surface of the lower flange 72 of the box girder 70 (the outer surface of the cladding material 74B (stainless steel) of the clad steel 74), but since both contacting metals are stainless steel, galvanic corrosion does not occur.

[0082] The standard thickness of the reinforcing plate 52 (clad steel 54) is 9 mm or more and 32 mm or less. The corrosion resistance of the reinforcing plate 52 improves as the thickness of the cladding material 54B (stainless steel) of the clad steel 54 constituting the reinforcing plate 52 increases, but the cost increases as the thickness of the cladding material 54B (stainless steel) increases. Therefore, the standard thickness of the cladding material 54B (stainless steel) of the reinforcing plate 52 is 0.5 mm or more and 4 mm or less, preferably 0.75 mm or more and 3 mm or less, and more preferably 1 mm or more and 2.5 mm or less.

[0083] The reinforcing plate 52 is attached to the object to be attached (in this fourth embodiment, the lower flange 72 of the box girder 70) by bringing the outer surface of the cladding material 54B (stainless steel) of the reinforcing plate 52 into close contact with the outer surface of the object to be attached (in this fourth embodiment, the lower surface of the lower flange 72 of the box girder 70) and friction-joining it using the tightening force of the high-strength bolts 57 and 58.

[0084] The edge (side) of the reinforcing plate 52 is painted with an epoxy resin paint and protected by an epoxy resin coating 29, as shown in Figure 9. While it is possible to use a corrosion-protective coating other than the epoxy resin coating 29 on the edge (side) of the reinforcing plate 52, as a general rule, zinc-containing coatings (such as zinc-rich coatings) are not used for corrosion protection on the edge (side) of the reinforcing plate 52. This is because stainless steel is significantly more noble than carbon steel, and if zinc comes into contact with stainless steel, it may be lost in a short period of time due to galvanic corrosion. Furthermore, if welding or heat bending is performed around the stainless steel while zinc is in contact with the stainless steel, the heat may cause zinc embrittlement cracking in the stainless steel.

[0085] The reinforcing plate 52 is made of clad steel 54 with stainless steel cladding material 54B. Therefore, even if the epoxy resin coating 29 peels off at the corner C2 (see Figure 9) between the outer surface (lower surface) of the lower flange 72 of the box girder 70 and the edge surface of the reinforcing plate 52, the carbon steel base material 54A of the reinforcing plate 52 (clad steel 54) will not be exposed as long as the peeling does not exceed the thickness of the stainless steel cladding material 54B, and corrosion of the base material 54A is prevented.

[0086] The mounting plate 56 is made of carbon steel, and has a zinc-rich coating 30 applied to its entire surface, as shown in Figure 9. Other than this, the mounting plate 56 is similar to the mounting plate 22 of the bridge member-to-member connecting device 10 according to the first embodiment, and the connecting cable 12 and the various members for transmitting force are attached to the outer surface of the mounting plate 56 (the surface opposite the reinforcing plate 52), in the same way as the mounting plate 22.

[0087] As described above, in the reinforcing plate 52 of the bridge member connecting device 19 according to the fourth embodiment, the mounting surface of the reinforcing plate 52 (the outer surface of the cladding material 54B) is unpainted, and the outer surface of the box girder 70 where the reinforcing plate 52 is mounted in the bridge 9 according to the fourth embodiment to which the bridge member connecting device 19 is applied is also unpainted. Therefore, no anticorrosion coating film exists between the mounting surface of the reinforcing plate 52 (the outer surface of the cladding material 54B) and the outer surface of the cladding material 74B (stainless steel) of the bottom flange 72 of the box girder 70. Therefore, in the bridge 9 to which the bridge member connecting device 19 according to the fourth embodiment is applied, there is no risk of the tightening force of the high-strength bolts 57, 58 decreasing due to creep of the anticorrosion coating film present between the reinforcing plate 52 and the box girder 70.

[0088] However, the mounting plate 56 is made of carbon steel and has a zinc-rich coating film 30 on its entire surface as shown in Fig. 9, and the zinc-rich coating film 30 is also present on the outer surface of the carbon steel base material 54A of the reinforcing plate 52 (the outer surface opposite the cladding material 54B) as shown in Fig. 9, and the zinc-rich coating film 30 is also present between the reinforcing plate 52 and the mounting plate 56, so there is a possibility that creep may occur due to the action of compressive force from the high-strength bolts 58. In addition, there is zinc-rich coating film 30 between the head 57A of the high-strength bolt 57 and the outer surface of the base material 54A of the reinforcing plate 52, and there is zinc-rich coating film 30 between the nut 57B of the high-strength bolt 57 and the upper surface of the bottom flange 72 of the box girder 70, and these zinc-rich coating films 30 are subjected to compressive force from the high-strength bolts 57, so there is a possibility that creep may occur. Furthermore, the zinc-rich coating film 30 is present between the head 58A of the high-strength bolt 58 and the outer surface of the mounting plate 56, and between the nut 58B of the high-strength bolt 58 and the upper surface of the lower flange 72 of the box girder 70. The compressive force of the high-strength bolt 58 acts on these zinc-rich coating films 30, which may cause creep. However, because the zinc-rich coating film 30 has excellent creep resistance, there is little risk that the tightening force of the high-strength bolts 57, 58 will be reduced due to creep of the zinc-rich coating film 30. The higher the zinc content in the zinc-rich coating film 30, the better the creep resistance and corrosion resistance. Therefore, from the viewpoint of creep resistance and corrosion resistance, the zinc content in the zinc-rich coating film 30 is preferably 60 wt% or more, and more preferably 70 wt% or more. Even in corrosion-resistant coatings other than zinc-rich coatings, the creep resistance and corrosion prevention performance improve as the content of the rust-preventive pigment increases, so even when a corrosion-resistant coating other than zinc-rich coating 30 is provided, the content of the rust-preventive pigment in the corrosion-resistant coating is preferably 60 wt% or more, and more preferably 70 wt% or more, from the viewpoint of creep resistance and corrosion prevention performance. Examples of rust-preventive pigments other than zinc include aluminum and zinc phosphate.

[0089] High-strength bolts 57, 58 can be high-strength bolts conventionally used for friction joining, but it is preferable to use bolts that have been treated with rust prevention in order to prevent stress corrosion cracking due to hydrogen embrittlement. However, since the objects to be fastened with high-strength bolts 57, 58 include cladding material 54B and cladding material 74B, which are stainless steel, if zinc-containing rust prevention treatment is used for high-strength bolts 57, 58, there is a risk that the zinc will be lost in a short period of time due to galvanic corrosion and that the stainless steel will suffer zinc embrittlement cracking. Therefore, in principle, zinc-containing rust prevention treatment is not used for high-strength bolts 57, 58.

[0090] To further improve the corrosion resistance of rust-proofed high-strength bolts, the rust-proofed high-strength bolts can be further painted with epoxy resin paint, polyurethane resin paint, or the like. It is preferable to further apply these paints to rust-proofed high-strength bolts. It is also possible to use high-strength bolts 57 and 58 that have not been rust-proofed. In this case, however, the inner surfaces of the high-strength bolt through-holes in the clad steel 54 of the reinforcing plate 52 and the inner surfaces of the high-strength bolt through-holes in the clad steel 74 of the bottom flange 72 of the box girder 70 must be painted in advance to prevent galvanic corrosion, and the high-strength bolts must be painted with epoxy resin paint, polyurethane resin paint, fluororesin paint, or the like after installation.

[0091] (5) Supplementary information In the embodiments described above, the first, third and fourth embodiments use a connecting cable 12 as the connecting member connecting the two anchor points, and the second embodiment uses a connecting chain 16. All of the connecting members have an elongated shape overall and are configured to be able to bend flexibly to a certain extent. However, in the present invention, the connecting members that can be used to connect the two anchor points are not limited to those with an elongated shape overall, and materials that are relatively rigid, such as PC steel rods, can also be used as connecting members if they are suitable for the application situation. [Explanation of symbols]

[0092] 2, 4, 6, 8, 9...Bridges 10, 14, 18, 19...Connecting devices between bridge members 12...Connecting cable 16...Connected chain 20, 21, 50...Upper fixing part 22, 56...Mounting plate 24, 54, 74...Clad steel 24A, 54A, 74A…Base material 24B, 54B, 74B...clad materials 26, 57, 58...High strength bolts 26A, 57A, 58A...Head 26B, 57B, 58B...Nut 28, 29...Epoxy resin coating 30...Zinc-rich coating 32...Vertical plate 34...Support plate 36…Apartment 38...Nut 40...Cushion rubber 42...Coil spring 44...Protective cover 46...Divider plate 48...Guide block 52...Reinforcing plate 60, 62...Lower fixing part 70...Box girder 72, 82...Bottom flange 76, 84...Abutments 77, 86, 94…Support 78, 88…Floor slab 80…Plate girder 90...Bridge girder 92...Bridge pier 100...Mounting plate 102...Carbon steel 104...Anti-corrosion coating 106...Corroded area C1, C2, C3...Inside corners

Claims

1. A bridge member connecting device that connects two bridge members, High strength bolts, a connecting member having a first connecting portion and a second connecting portion, the first connecting portion being connected to one of the two bridge members and the second connecting portion being connected to the other of the two bridge members, thereby connecting the two bridge members to each other; an attachment plate made of clad steel having a stainless steel clad material and a carbon steel base material, to which at least one of the first connection portion and the second connection portion of the connection member is attached; and The mounting plate is configured to be fixed to at least one of the two bridge members by the high-strength bolts in a manner such that the outer surface of the stainless steel is in contact with the outer surface of the bridge member.

2. the mounting plate includes a first mounting plate and a second mounting plate; the first mounting plate is fixed to one of the two bridge members, and the second mounting plate is fixed to the other of the two bridge members; The bridge member connecting device according to claim 1, wherein the connecting member is configured such that the first connecting portion is attached to the first mounting plate and the second connecting portion is attached to the second mounting plate.

3. 3. The bridge member connecting device according to claim 1, wherein the edge of the mounting plate is coated with an epoxy resin.

4. 3. The connecting device between bridge members according to claim 1, wherein the mounting plate has a coating film containing 60 wt % or more of an anti-rust pigment on the surface opposite to the surface that contacts the outer surface of the bridge member.

5. 5. The connecting device between bridge members according to claim 4, wherein the anti-rust pigment is zinc.

6. A bridge member connecting device that connects two bridge members, High strength bolts, a connecting member having a first connecting portion and a second connecting portion, the first connecting portion being connected to one of the two bridge members and the second connecting portion being connected to the other of the two bridge members, thereby connecting the two bridge members to each other; a mounting plate to which at least one of the first connecting portion and the second connecting portion of the connecting member is attached; a reinforcing plate arranged between the mounting plate and the bridge member to which the mounting plate is attached, the reinforcing plate being made of clad steel with a stainless steel clad material and a carbon steel base material; and the mounting plate is fixed to at least one of the two bridge members by the high-strength bolts via the reinforcing plate, which is arranged so that the outer surface of the stainless steel is in contact with the outer surface of at least one of the two bridge members.

7. a first high-strength bolt and a second high-strength bolt as the high-strength bolts; a first mounting plate of the mounting plates to which the first connecting portion of the connecting member is attached; a second mounting plate of the mounting plates to which the second connecting portion of the connecting member is attached; a first reinforcing plate disposed between the first mounting plate and one of the two bridge members to which the first mounting plate is fixed, the first reinforcing plate being made of clad steel with a stainless steel clad material and a carbon steel base material; a second reinforcing plate disposed between the second mounting plate and the other of the two bridge members to which the second mounting plate is fixed, the second reinforcing plate being made of clad steel with a stainless steel clad material and a carbon steel base material; and the first mounting plate is configured to be fixed to one of the two bridge members by the first high-strength bolts via the first reinforcing plate, the first reinforcing plate being arranged so that the stainless steel outer surface of the first reinforcing plate is in contact with the outer surface of one of the two bridge members; 7. The connecting device between bridge members according to claim 6, wherein the second mounting plate is configured to be fixed to the other of the two bridge members by the second high-strength bolts via the second reinforcing plate, which is arranged so that the stainless steel outer surface of the second reinforcing plate contacts the outer surface of the other of the two bridge members.

8. 8. The bridge member connecting device according to claim 6, wherein the reinforcing plate has an edge surface coated with an epoxy resin.

9. The connecting device between bridge members according to claim 6 or 7, characterized in that the reinforcing plate has a coating film containing 60 wt % or more of an anti-rust pigment on the surface opposite to the surface that contacts the outer surface of the bridge member.

10. The connecting device between bridge members according to claim 9, wherein the anti-rust pigment is zinc.

11. 8. The connecting device between bridge members according to claim 1, 2, 6 or 7, wherein the high-strength bolts are subjected to a rust-proofing treatment that does not contain zinc.

12. A bridge to which the bridge member connecting device according to claim 1 is applied, wherein one of the two bridge members is a stainless steel bridge girder configured so that the stainless steel forms an outer surface, and the other of the two bridge members is a substructure that supports the stainless steel bridge girder from below, The mounting plate is fixed to the stainless steel bridge girder by the high-strength bolts in a manner that the stainless steel outer surface of the mounting plate is in contact with the outer surface of the stainless steel bridge girder, A bridge characterized in that the connecting member has the first connecting portion attached to the mounting plate fixed to the stainless steel bridge girder, and the second connecting portion connected to the substructure.

13. The bridge described in claim 12, characterized in that the stainless steel bridge girder has clad steel with a stainless steel clad material and a carbon steel base material, and is configured so that the stainless steel clad material forms the outer surface.

14. The bridge described in claim 12 or 13, characterized in that the outer surface of the cladding material of the mounting plate itself is unpainted, and the portion of the outer surface of the stainless steel bridge girder that comes into contact with the unpainted outer surface is also unpainted.

15. A bridge to which the bridge member connecting device according to claim 2 is applied, wherein the two bridge members are two stainless steel bridge girders configured so that stainless steel forms an outer surface, and the two bridge members are adjacent to each other so that their longitudinal directions are connected in the bridge axis direction, The first mounting plate is fixed to one of the two stainless steel bridge girders by the high-strength bolts in a manner that the stainless steel outer surface of the first mounting plate is in contact with the outer surface of one of the two stainless steel bridge girders, The second mounting plate is fixed to the other stainless steel bridge girder with the high-strength bolts in a manner that the stainless steel outer surface of the second mounting plate is in contact with the outer surface of the other of the two stainless steel bridge girders, A bridge characterized in that the connecting member has the first connecting portion attached to the first mounting plate fixed to one of the two stainless steel bridge girders, and the second connecting portion attached to the second mounting plate fixed to the other of the two stainless steel bridge girders.

16. The bridge described in claim 15, characterized in that both of the two stainless steel bridge girders have clad steel with stainless steel as the clad material and carbon steel as the base material, and are configured so that the stainless steel clad material forms the outer surface.

17. The bridge described in claim 15 or 16, characterized in that the outer surfaces of the cladding materials of both of the two mounting plates are unpainted, and the portions of the outer surfaces of the corresponding stainless steel bridge girders that come into contact with the unpainted outer surfaces are also unpainted.

18. 7. A bridge to which the bridge member connecting device according to claim 6 is applied, wherein one of the two bridge members has a stainless steel bridge girder configured so that the stainless steel forms an outer surface, and the other of the two bridge members has a substructure that supports the stainless steel bridge girder from below, The mounting plate is fixed to the stainless steel bridge girder by the high-strength bolts via the reinforcing plate, which is arranged so that the stainless steel outer surface of the reinforcing plate is in contact with the outer surface of the stainless steel bridge girder, A bridge, characterized in that the connecting member has the first connecting portion attached to the mounting plate and the second connecting portion connected to the substructure.

19. The bridge described in claim 18, characterized in that the stainless steel bridge girder has clad steel with a stainless steel clad material and a carbon steel base material, and is configured so that the stainless steel clad material forms the outer surface.

20. The bridge described in claim 18 or 19, characterized in that the outer surface of the cladding material of the reinforcing plate itself is unpainted, and the portion of the outer surface of the stainless steel bridge girder that comes into contact with the unpainted outer surface is also unpainted.

21. A bridge to which the bridge member connecting device according to claim 7 is applied, wherein the two bridge members are two stainless steel bridge girders configured so that stainless steel forms an outer surface, and the two bridge members are adjacent to each other so that their longitudinal directions are connected in the bridge axis direction, the first mounting plate is fixed to one of the two stainless steel bridge girders by the first high-strength bolts via the first reinforcing plate, which is arranged so that the stainless steel outer surface of the first reinforcing plate contacts the outer surface of one of the two stainless steel bridge girders; the second mounting plate is fixed to the other of the two stainless steel bridge girders by the second high-strength bolts via the second reinforcing plate, which is arranged so that the stainless steel outer surface of the second reinforcing plate is in contact with the outer surface of the other of the two stainless steel bridge girders; A bridge, characterized in that the first connecting portion of the connecting member is attached to the first mounting plate, and the second connecting portion of the connecting member is attached to the second mounting plate.

22. The bridge described in claim 21, characterized in that both of the two stainless steel bridge girders have clad steel with stainless steel as the clad material and carbon steel as the base material, and are configured so that the stainless steel clad material forms the outer surface.

23. A bridge as described in claim 21 or 22, characterized in that the outer surfaces of the cladding materials of both of the two reinforcing plates are unpainted, and the portions of the outer surface of the stainless steel bridge girder with which the unpainted outer surfaces of the two reinforcing plates respectively contact are also unpainted.

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