Reinforcement method

Abstract

The present invention provides a reinforcement method that suppresses the increase in dead load of the steel deck while also suppressing the occurrence of fatigue cracks in the welded joints between the deck plate and the longitudinal ribs. [Solution] The reinforcement method is for reinforcing a steel deck plate having a deck plate and longitudinal ribs that extend along the bridge axis direction and are welded to the lower surface of the deck plate, forming a closed cross section with the deck plate, and includes the steps of filling the closed cross section of the longitudinal rib with a filler made of resin mortar and bonding a reinforcing material made of fiber-reinforced plastic from the lower surface of the deck plate to the outer surface of the longitudinal rib, wherein the filling of the filler is performed before the bonding of the reinforcing material.

Description

Technical Field

[0001] The present invention relates to a reinforcing method for reinforcing a steel floor slab.

Background Art

[0002] Conventionally, a bridge having a deck plate and a steel floor slab with vertical ribs is known. The deck plate is a floor plate that supports a passing object (e.g., a vehicle, a person, etc.) passing through the bridge. The vertical ribs are ribs that extend along the bridge axis direction and are welded to the lower surface of the deck plate to form a closed cross-section with the deck plate. Note that the bridge axis direction is the extension direction of the bridge.

[0003] In such a steel floor slab, due to the load of the passing object passing on the deck plate, stress concentrates on the welded portion between the deck plate and the vertical rib, and it is an issue to suppress fatigue cracks generated at the welded portion.

[0004] Patent Document 1 discloses a reinforcing structure for a steel floor slab composed of a deck plate and a plurality of vertical ribs, wherein the vertical ribs are fixed to the back surface of the deck plate at a predetermined interval in the direction perpendicular to the bridge axis, and a backing plate along the opposing side outer surfaces of adjacent vertical ribs and the back surface of the deck plate therebetween is joined to the side outer surfaces and the back surface of the deck plate, and a filler is filled in the surrounding space surrounded by the inner surface of the vertical rib and the back surface of the deck plate.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the reinforcing structure described in Patent Document 1, steel plates are used as backing plates, and mortar is used as a filler material. As a result, the dead load of the steel deck increases. When the dead load of the steel deck increases, the load on the support structure that supports the steel deck increases.

[0007] The present invention aims to provide a reinforcement method that can suppress the occurrence of fatigue cracks in the welded joints between the deck plate and the longitudinal ribs while suppressing the increase in dead load of the steel deck. [Means for solving the problem]

[0008] The first embodiment of the reinforcement method is a method for reinforcing a steel deck plate having a deck plate and longitudinal ribs extending along the bridge axis direction and welded to the lower surface of the deck plate, forming a closed cross section with the deck plate, and comprising the steps of filling the closed cross section of the longitudinal rib with a filler made of resin mortar and bonding a reinforcing material made of fiber-reinforced plastic from the lower surface of the deck plate to the outer surface of the longitudinal rib, wherein the filling of the filler is performed before the bonding of the reinforcing material.

[0009] In the reinforcement method of the second embodiment, in the reinforcement method of the first embodiment, the reinforcing material has a plate bonding portion that is bonded to the lower surface of the deck plate, a rib bonding portion that is bonded to the outer surface of the longitudinal rib, and a connecting portion that connects the plate bonding portion and the rib bonding portion, wherein the connecting portion is formed in an arc shape when viewed in the bridge axis direction, and in the step of bonding the reinforcing material, the reinforcing material is bonded with a high-elongation material having a higher elongation than the reinforcing material sandwiched between the deck plate and the longitudinal rib and the reinforcing material, and with an unevenness leveling material interposed in the gap between the deck plate and the longitudinal rib and the high-elongation material, in the gap at the connecting portion.

[0010] In the reinforcement method of the third embodiment, in the step of bonding the reinforcing material in the reinforcement method of the second embodiment, the reinforcing material is bonded with an adhesive while the high-stretch material is sandwiched between the deck plate and the longitudinal ribs and the reinforcing material, the high-stretch material is provided in direct contact with the surfaces of the deck plate and the longitudinal ribs at the plate bonding portion and the rib bonding portion, and the adhesive is interposed between the high-stretch material and the reinforcing material. [Effects of the Invention]

[0011] The present invention employs the above method, which has the excellent effect of suppressing the increase in dead load of the steel deck while suppressing the occurrence of fatigue cracks in the welded joints between the deck plate and the longitudinal ribs. [Brief explanation of the drawing]

[0012] [Figure 1] This is a schematic diagram showing a portion of a bridge reinforced by the reinforcing structure according to this embodiment. [Figure 2] Figure 1 is a perspective view of a portion of the steel deck of the bridge shown, taken from a diagonal downward angle. [Figure 3] This is a partially enlarged view of a portion of the bridge shown in Figure 1. [Figure 4] This is a perspective view of the reinforcing material according to this embodiment, seen from diagonally below. [Figure 5] This is a front view of the reinforcing member according to this embodiment, as seen from one side in the bridge axis direction (specifically, the front side of the paper in Figures 1 and 3). [Figure 6] This figure shows a configuration (comparative example) in which no reinforcing material is provided according to this embodiment. [Modes for carrying out the invention]

[0013] An example of an embodiment of the present invention will be described below with reference to the drawings.

[0014] (Bridge 10) First, the bridge 10 to be reinforced by the reinforcement structure 19 according to the present embodiment will be described. FIG. 1 is a schematic view showing a part of the bridge 10. FIG. 2 is a perspective view of a part of the steel floor slab 12 provided on the bridge 10 as viewed obliquely from below. FIG. 3 is an enlarged view of a part of the bridge 10 shown in FIG. 1, which is partially enlarged.

[0015] In each figure, the X direction indicates the bridge axis direction, the Y direction indicates the direction perpendicular to the bridge axis, and the Z direction indicates the vertical direction. The bridge axis direction is the extension direction of the bridge 10. The direction perpendicular to the bridge axis is a direction perpendicular to the bridge axis direction and the vertical direction. The X direction, the Y direction, and the Z direction are mutually orthogonal directions. In the following description, the bridge axis direction may be referred to as the front-rear direction, and the direction perpendicular to the bridge axis may be referred to as the left-right direction.

[0016] The bridge 10 shown in FIG. 1 is, for example, a bridge used as a viaduct on which a highway is laid. As shown in FIG. 1, the bridge 10 includes a paving material 11 and a steel floor slab 12. The steel floor slab 12 has a deck plate 14, a plurality of main girders 16, lateral ribs 18, and a plurality of U ribs 20. Each of the deck plate 14, the main girders 16, the lateral ribs 18, and the U ribs 20 is made of steel. The U rib 20 is an example of a longitudinal rib.

[0017] The deck plate 14 is a floor plate that supports a passing object (e.g., vehicle 100, person, etc.) passing through the bridge 10. The deck plate 14 is formed in a flat plate shape with the vertical direction as the thickness direction. The upper surface 14A of the deck plate 14 is paved with the paving material 11. As the paving material 11, various materials such as asphalt or concrete can be used. This can be done.

[0018] The main girders 16 extend along the bridge axis direction. The cross-sectional shape of the main girders 16 as viewed in the bridge axis direction is, for example, an I shape as an example. The upper end portion of the main girders 16 is welded to the lower surface 14B of the deck plate 14, for example.

[0019] The transverse rib 18 extends along the direction perpendicular to the bridge axis and is a rib welded to the lower surface 14B of the deck plate 14. In a view in the direction perpendicular to the bridge axis, the cross-sectional shape of the transverse rib 18 is, for example, an inverted T shape (see FIG. 2). One end and the other end of the transverse rib 18 in the direction perpendicular to the bridge axis are welded to the main girder 16, for example, as shown in FIG. 1.

[0020] Specifically, as shown in FIG. 2, the transverse rib 18 has a web 18A formed in a plate shape with the bridge axis direction as the thickness direction, and flanges 18B projecting from the lower end of the web 18A in the front-rear direction (i.e., one side and the other side of the bridge axis direction). The flange 18B is formed in a plate shape with the vertical direction as the thickness direction. The upper end of the web 18A is welded to the lower surface 14B of the deck plate 14, for example.

[0021] Furthermore, recesses 18C in which U-shaped ribs 20 are arranged are formed at the upper ends of the webs 18A. A plurality of these recesses 18C are arranged at predetermined intervals in the direction perpendicular to the bridge axis. Each of the recesses 18C opens upward (i.e., toward the deck plate 14 side).

[0022] The U-shaped rib 20 intersects the transverse rib 18 and extends along the bridge axis direction, and is a rib welded to the lower surface 14B of the deck plate 14. Specifically, the U-shaped rib 20 passes through the recess 18C of the transverse rib 18. In other words, the U-shaped rib 20 extends along the bridge axis direction so as to penetrate the transverse rib 18.

[0023] Furthermore, as shown in FIG. 3, the U-shaped rib 20 is formed in a U-shaped cross-sectional shape that opens upward (i.e., toward the deck plate 14 side) when viewed in the bridge axis direction. Specifically, the U-shaped rib 20 has a bottom wall portion 22 extending in the direction perpendicular to the bridge axis when viewed in the bridge axis direction, and a pair of side wall portions 23, 25 extending upward from each of the left end portion and the right end portion of the bottom wall portion 22 (i.e., one end portion and the other end portion in the direction perpendicular to the bridge axis). The bottom wall portion 22 is formed in a plate shape with the vertical direction as the thickness direction.

[0024] As shown in Figure 3, the side walls 23 and 25 are inclined with respect to the bottom wall 22 such that the distance between them increases towards the upper end (i.e., the deck plate 14 side). Specifically, the side wall 23 is arranged along an inclination direction M1 perpendicular to the bridge axis when viewed in the bridge axis direction. The side wall 25 is arranged along an inclination direction M2 perpendicular to the bridge axis when viewed in the bridge axis direction.

[0025] The side wall portion 23 is formed in a plate shape with a thickness direction of N1 perpendicular to the inclination direction M1. The side wall portion 25 is formed in a plate shape with a thickness direction of N2 perpendicular to the inclination direction M2. The upper ends of the side wall portions 23 and 25 are welded to the lower surface 14B of the deck plate 14. As a result, the U-rib 20 forms a closed cross section with the deck plate 14. The outer circumferential surface of the U-rib 20 (i.e., the lower surface of the bottom wall portion 22 and the outer surfaces of the side wall portions 23 and 25) are welded to the edge portion of the recess 18C in the web 18A of the transverse rib 18.

[0026] A fan-shaped notch, or scallop, is formed at the upper edge of the recess 18C of the transverse rib 18. The scallop 18E creates welds 71 ​​(see Figure 6) between the deck plate 14 and the upper end of the U-rib 20, 72 (see Figure 6) between the deck plate 14 and the transverse rib 18, and 73 (see Figure 6) between the side walls 23, 25 of the U-rib 20 and the transverse rib 18. This avoids the overlapping of the two elements.

[0027] As shown in Figure 3, a scallop 18F, which is a notch, is formed at the lower end of the recess 18C of the transverse rib 18. The scallop 18F is formed along the lower portion of the bottom wall 22 and side wall portions 23 and 25 of the U-rib 20 when viewed in the bridge axis direction.

[0028] (Reinforcement structure 19) As shown in Figure 1, the reinforcing structure 19 comprises a filler material 40 and a pair of reinforcing members 50 and 51. In this reinforcing structure 19, multiple pairs of reinforcing members 50 and 51 are provided, and each pair of reinforcing members 50 and 51 is bonded from the lower surface 14B of the deck plate 14 to the outer surface of the U-rib 20. In addition, in the reinforcing structure 19, the filler material 40 is filled into the closed section formed by the U-rib 20 to which the reinforcing members 50 and 51 are bonded and the deck plate 14. The filler material 40 and the reinforcing members 50 and 51 will be described in detail below. Figure 4 is a perspective view of the reinforcing member 50 seen from diagonally below. Figure 5 is a front view of the reinforcing member 50 seen from one side in the bridge axis direction (specifically, the front side of the paper in Figures 1 and 3).

[0029] (filler 40) The filler material 40 is filled into the closed sections of each of two adjacent U-ribs 20(A) and 20(B) perpendicular to the bridge axis. Specifically, the filler material 40 is filled into the closed sections of the U-ribs 20 located in the first range 61, through which the wheels 102 of a vehicle 100 traveling on the deck plate 14 pass. The filler material 40 is not filled into the closed sections of the U-ribs 20 located in the second range 62, through which the wheels 102 of a vehicle 100 traveling on the deck plate 14 do not pass, or through which the frequency of the wheels 102 passing is lower than in the first range 61.

[0030] In this embodiment, among the U-ribs 20, those U-ribs 20 that overlap at least a portion with the first range 61 in a vertical view can be identified as U-ribs 20 located in the first range 61. Furthermore, among the U-ribs 20, those that completely overlap with the second range 62 in a vertical view can be identified as U-ribs 20 located in the second range 62. The first range 61 and the second range 62 are areas aligned perpendicular to the bridge axis. For example, the lane on which a vehicle 100 travels can be identified as the first range 61, and the shoulder and roadside can be identified as the second range 62. Additionally, for example, within a lane, the position where the wheels pass (i.e., the wheel load position) can be identified as the first range 61, and the remaining area can be identified as the second range 62.

[0031] The filler 40 is made of resin mortar. Resin mortar is a composition containing a binder and aggregate, and the composition contains a resin component.

[0032] In resin mortar, the resin used as a binder is preferably a liquid thermosetting resin that can be cured at room temperature, such as epoxy resin, acrylic resin, vinyl ester resin, unsaturated polyester resin, polyurethane resin, or polyurea resin, with epoxy resin being particularly preferred. Bisphenol A type epoxy resin or bisphenol F type epoxy resin can be suitably used. The epoxy resin curing agent is not particularly limited as long as it reacts and cures with the epoxy resin at room temperature, but polyamine-based curing agents are preferred, with aliphatic polyamines or modified versions thereof being particularly preferred. The curing agent is blended in an amount of 20 to 70 parts by weight, preferably 30 to 60 parts by weight, per 100 parts by weight of epoxy resin.

[0033] Aggregates used in resin mortar can include conventionally used fine aggregates such as silica sand, mountain sand, river sand, sea sand, and artificial lightweight aggregates, as well as oxide ceramics such as alumina and silica, carbide ceramics such as silicon carbide and boron carbide, other fine ceramics, crushed ceramic materials such as mullite, and reinforcing fibers in the form of strips or short fibers. Multiple types of these can also be used in combination. The aggregate particle size should be 5000 μm or less. Fine particles are preferred, and particles with a particle size of 2000 μm or less are more preferred.

[0034] The amount of aggregate relative to the binder is 30 to 300 parts by weight, preferably 40 to 150 parts by weight, per 100 parts by weight of binder. If the amount of aggregate is less than 50 parts by weight, the resin mortar will not be strong enough to provide the necessary reinforcement strength, and if it exceeds 300 parts by weight, the fluidity of the resin mortar will decrease due to the excessive amount of aggregate, leading to insufficient impregnation of the fiber sheet and poor workability. In addition, the resin mortar may contain other additives such as silane coupling agents, viscosity modifiers, and colorants in amounts of 0.1 to 8 parts by weight, with the aim of improving the affinity between the aggregate and the resin.

[0035] The specific gravity of the filler material 40 is set to 1.2 or less. Furthermore, from the viewpoint of not increasing the dead load of the steel deck slab 12, the specific gravity of the filler material 40 is preferably 1.0 or less. Also, from the viewpoint of strength characteristics, the specific gravity of the filler material 40 is preferably 0.5 or more. Note that this specific gravity is based on the specific gravity of water at 4 degrees Celsius at 1 atmosphere.

[0036] As an example, the filling of the filler material 40 is carried out by the following method: A hole is formed in the lower end of at least one of the side walls 23, 25 of the U-rib 20, and a filling tube (or similar) for filling the filler material 40 is inserted into the hole. Furthermore, a hole is formed in the upper end of at least one of the side walls 23, 25 of the U-rib 20, and a confirmation tube (or similar) for confirming the filling of the filler material 40 is inserted into the hole. The filler material 40 is filled from the filling tube, and when the filler material 40 is discharged from the confirmation tube, the filling is considered complete, and the U-rib 20 is filled into its closed cross-section. In addition, the filling of the filler material 40 is carried out, for example, before the pair of reinforcing members 50, 51 are bonded to the deck plate 14 and the U-rib 20.

[0037] (Reinforcement materials 50, 51) The pair of reinforcing members 50 and 51 are positioned in region 29R between two adjacent U-ribs 20(A) and 20(B) perpendicular to the bridge axis, as shown in Figure 1. In this embodiment, region 29R is the region located in the first range 61 through which the wheels 102 of a vehicle 100 traveling on the deck plate 14 pass. That is, the reinforcing members 50 and 51 are positioned in region 29R located in the first range 61 through which the wheels 102 of a vehicle 100 traveling on the deck plate 14 pass.

[0038] In areas 29S where the wheels 102 of a vehicle 100 traveling on the deck plate 14 do not pass, or where the frequency of the wheels 102 passing is lower than in the first area 61, the pair of reinforcing members 50 and 51 are not placed. In Figure 1, one of the multiple areas 29S is labeled with a reference numeral.

[0039] In this embodiment, among the regions between the two U-ribs 20, the region that overlaps with the first range 61 in a vertical view can be identified as the region 29R located in the first range 61. Furthermore, among the regions between the two U-ribs 20, the region that completely overlaps with the second range 62 in a vertical view can be identified as the region 29S located in the second range 62.

[0040] Reinforcement members 50 and 51 are formed similarly, except that they are formed symmetrically, as shown in Figure 3. Therefore, in the following description, reinforcement member 50 will be described, and for reinforcement member 51, the same reference numerals will be used for parts that have the same function as reinforcement member 50, and their descriptions will be omitted as appropriate.

[0041] The reinforcing material 50 is made of fiber-reinforced plastic. The fibers used in the reinforcing material 50 include, for example, organic fibers such as aramid, PBO (poly(p-phenylene benzbisoxazole)), polyamide, polyarylate, and polyester, as well as basalt fibers, carbon fibers, and gas. Metal fibers such as lath fibers and steel fibers can be used, either individually or in combination of multiple types.

[0042] As shown in Figures 2, 3, and 4, the reinforcing member 50 has a plate bonding portion 54 that is bonded to the lower surface 14B of the deck plate 14 and a U-rib bonding portion 52 that is bonded to the U-rib 20.

[0043] The plate bonding portion 54 constitutes the upper end portion of the reinforcing material 50 and is formed in a plate shape with the vertical direction as the thickness direction. The upper surface 54A of the plate bonding portion 54 is bonded to the lower surface 14B of the deck plate 14. In other words, the upper surface 54A of the plate bonding portion 54 functions as the bonding surface to the deck plate 14.

[0044] The U-rib bonding portion 52 constitutes one end portion of the reinforcing member 50 in the direction perpendicular to the bridge axis and is arranged along the inclination direction M2. The U-rib bonding portion 52 is formed in a plate shape with the thickness direction being in the direction perpendicular to the bridge axis (specifically, the orthogonal direction N2). One end face 52A of the U-rib bonding portion 52 in the direction perpendicular to the bridge axis (specifically, the orthogonal direction N2) is bonded to the outer surface of the side wall portion 25 of the U-rib 20(A). That is, one end face 52A of the U-rib bonding portion 52 in the direction perpendicular to the bridge axis functions as the bonding surface to the U-rib 20(A). In the reinforcing member 51, the U-rib bonding portion 52 is arranged along the inclination direction M1 and is bonded to the outer surface of the side wall portion 23 of the U-rib 20(B).

[0045] The reinforcing member 50 further includes a connecting portion 55. As shown in Figure 5, the connecting portion 55 connects one end of the plate bonding portion 54 perpendicular to the bridge axis to the upper end of the U-rib bonding portion 52. The connecting portion 55 is formed in an arc shape (R shape) when viewed in the direction of the bridge axis.

[0046] In the reinforcing material 50, the plate bonding portion 54 and the U-rib bonding portion 52 contain fibers oriented in two directions in a plan view: in the direction of the bridge axis and in the direction perpendicular to the bridge axis. Specifically, in the plate bonding portion 54, the fibers are oriented in two directions: in the direction of the bridge axis and in the direction perpendicular to the bridge axis. In the U-rib bonding portion 52, the fibers are oriented in two directions: in the direction of the bridge axis and in the inclination direction M2 (vertical direction in a view perpendicular to the bridge axis).

[0047] As described above, the reinforcing members 50 and 51 are bonded from the lower surface 14B of the deck plate 14 to the outer surface of the U-rib 20 by bonding the plate bonding portion 54 to the lower surface 14B of the deck plate 14 and bonding the U-rib bonding portion 52 to the U-rib 20. Furthermore, in this embodiment, the plate bonding portion 54 and the U-rib bonding portion 52 are bonded to the steel deck plate 12 with a high-elongation material 90 having a higher elongation than the reinforcing members 50 and 51 sandwiched between each of the plate bonding portion 54 and the U-rib bonding portion 52 and each part of the steel deck plate 12. In addition, a leveling material 92 made of a resin material such as epoxy resin may be applied to the gap between the deck plate 14 and the U-rib 20 and the high-elongation material 90 (the gap at the connecting portion 55 of the reinforcing member 50).

[0048] As the high-elongation material 90, for example, resin materials such as polyurea resin, urethane resin, or epoxy resin can be used. The high-elongation material 90 is applied directly to each part of the steel deck 12 as a putty material and then hardened. As the adhesive for bonding the reinforcing materials 50 and 51 to the steel deck 12, for example, room-temperature curing epoxy resin, epoxy acrylate resin, acrylic resin, MMA resin, vinyl ester resin, unsaturated polyester resin, and photocuring resin can be used. Also, as shown in Figure 3, when bonding the reinforcing materials 50 and 51 to the steel deck 12, for example, a retaining member 98 such as a rivet may be used to hold the reinforcing materials 50 and 51 to the steel deck 12. For example, a magnet may be used as the retaining member 98. If a magnet is used as the retaining member 98, the retaining member 98 may be removed after the adhesive has hardened. Also, the retaining member 98 is not an essential component, and the retaining member may be used to hold the reinforcing materials 50 and 51 to the steel deck 12. A configuration that does not use component 98 is also acceptable.

[0049] In the reinforcing member 50, the width W1 (see Figure 5) of the plate bonding portion 54 (including the portion from the center 55P in the circumferential direction S1 of the connecting portion 55 to the plate bonding portion 54 side) perpendicular to the bridge axis is, for example, 100 mm or more and 200 mm or less.

[0050] The length H1 (see Figure 5) of the inclination direction M2 of the U-rib bonding portion 52 (including the portion from the center 55P in the circumferential direction S1 of the connecting portion 55 to the U-rib bonding portion 52 side) is, for example, 150 mm or more and 1250 mm or less. The length H1 is longer than the width W1.

[0051] The length L1 (see Figure 4) in the bridge axis direction of the U-rib bonding section 52 and the plate bonding section 54 is, for example, 500 mm or more and 1000 mm or less. Length L1 is longer than length H1.

[0052] The thickness T1 (see Figure 5) of the plate bonding portion 54 and the U-rib bonding portion 52 is, for example, 6 mm or more and 12 mm or less.

[0053] The radius 55R of the connecting portion 55 (see Figure 5) is set to, for example, 20 mm or more and 40 mm or less. Also, in the bridge axis direction, the angle θ1 of the U-rib bonding portion 52 with respect to the plate bonding portion 54 (see Figure 5) is set to, for example, 95 degrees or more and 115 degrees or less.

[0054] (Effects of this embodiment) The effects and advantages of this embodiment will now be explained.

[0055] In the reinforcement structure 19 according to this embodiment, a plurality of pairs of reinforcing members 50 and 51 are provided, and each pair of reinforcing members 50 and 51 is bonded from the lower surface 14B of the deck plate 14 to the outer surface of the U-rib 20. In addition, in the reinforcement structure 19, the filler material 40 is filled into the closed cross-section formed by the U-rib 20 to which the reinforcing members 50 and 51 are bonded and the deck plate 14.

[0056] In this configuration, as shown in Figure 6, if reinforcing members 50 and 51 are not provided to the steel deck slab 12, repeated loads from objects (e.g., vehicles 100, people, etc.) passing over the bridge 10 may cause deformation of the deck plate 14 and U-rib 20, and fatigue cracks may occur in the welded joint 71 between the deck plate 14 and the U-rib 20.

[0057] In contrast, in the reinforcing structure 19, as described above, each of the pair of reinforcing members 50 and 51 is bonded from the lower surface 14B of the deck plate 14 to the outer surface of the U-rib 20, and the filler material 40 is filled into the closed cross-section formed by the U-rib 20 to which the reinforcing members 50 and 51 are bonded and the deck plate 14, so that deformation of the deck plate 14 and the U-rib 20 is suppressed. As a result, the stress acting on the welded joint 71 is reduced, and the occurrence of fatigue cracks in the welded joint 71 can be suppressed.

[0058] Furthermore, in the reinforcement structure 19, since the reinforcing materials 50 and 51 are made of fiber-reinforced plastic, the reinforcing materials 50 and 51 can be made lighter compared to when the reinforcing materials 50 and 51 are made of steel plates. For reference, the specific gravity of steel plates is, for example, about 7.85, while when carbon fiber reinforced plastic is used as the fiber-reinforced plastic, the specific gravity is said to be about 1.5 to 1.8. In addition, since the filler material 40 is made of resin mortar, the filler material 40 can be made lighter compared to when the filler material 40 is made of mortar or cement that does not contain resin.

[0059] Conventionally, resin-free mortars and cements used as fillers have a specific gravity exceeding 1.2, whereas in this embodiment, the filler 40 has a specific gravity of 1.2 or less. As a result, the increase in dead load of the steel deck 12 can be suppressed while the occurrence of fatigue cracks in the welded joint 71 can be suppressed.

[0060] Furthermore, in the reinforcing materials 50 and 51, the plate bonding portion 54 and the U-rib bonding portion 52 contain fibers oriented in two directions in a plan view: in the bridge axis direction and in the direction perpendicular to the bridge axis. Therefore, compared to a configuration in which the fibers in the plate bonding portion 54 and the U-rib bonding portion 52 are oriented in only one direction, they can withstand loads acting in two directions, in the bridge axis direction and in the direction perpendicular to the bridge axis, and the stress acting in the welded portion 71 can be reduced. As a result, the occurrence of fatigue cracks in the welded portion 71 can be suppressed.

[0061] Furthermore, in the reinforcing structure 19, the pair of reinforcing members 50 and 51 are positioned in the region 29R between two adjacent U-ribs 20(A) and 20(B) perpendicular to the bridge axis, as shown in Figure 1. In addition, reinforcing member 50 is bonded from the lower surface 14B of the deck plate 14 to the outer surface of the U-rib 20(A), and reinforcing member 51 is bonded from the lower surface 14B of the deck plate 14 to the outer surface of the U-rib 20(B).

[0062] Therefore, compared to a configuration in which only one reinforcing member 50 is placed in region 29R between the two U-ribs 20(A) and 20(B), the stress acting on the welded joint 71 in region 29R can be reduced. As a result, the occurrence of fatigue cracks in the welded joint 71 can be suppressed.

[0063] Furthermore, in the reinforcing structure 19, the filler material 40 is filled into the closed section of the U-rib 20 located in the first range 61 through which the wheels 102 of the vehicle 100 traveling on the deck plate 14 pass. The filler material 40 is not filled into the closed section of the U-rib 20 located in the second range 62 through which the wheels 102 of the vehicle 100 traveling on the deck plate 14 do not pass, or through which the frequency of the wheels 102 passing is lower than in the first range 61.

[0064] Therefore, compared to a configuration in which the filler material 40 is filled into the closed cross-section of all U-ribs 20, this configuration can efficiently support the wheel load of the wheels 102 of the vehicle 100 running on the deck plate 14.

[0065] Furthermore, in the reinforcement structure 19, the pair of reinforcing members 50 and 51 are positioned in the region 29R located in the first range 61 through which the wheels 102 of the vehicle 100 traveling on the deck plate 14 pass, as shown in Figure 1. The pair of reinforcing members 50 and 51 are not positioned in the region 29S located in the second range 62 through which the wheels 102 of the vehicle 100 traveling on the deck plate 14 do not pass, or through which the frequency of the wheels 102 passing is lower than in the first range 61.

[0066] Therefore, compared to a configuration in which a pair of reinforcing members 50 and 51 are placed in the entire region 29R between the two U-ribs 20(A) and 20(B), this configuration can efficiently support the wheel load of the wheels 102 of the vehicle 100 running on the deck plate 14.

[0067] Furthermore, in the reinforcing structure 19, the plate bonding portion 54 and the U-rib bonding portion 52 are bonded to the steel deck 12 with a high-elongation material 90 having a higher elongation than the reinforcing materials 50 and 51 sandwiched between each of the plate bonding portion 54 and the U-rib bonding portion 52 and each part of the steel deck 12.

[0068] Therefore, compared to a configuration in which the entire plate bonding portion 54 and U-rib bonding portion 52 are bonded in direct contact with the steel deck 12, the reinforcing members 50 and 51 follow the deformation of the steel deck 12, and peeling of the reinforcing members 50 and 51 is suppressed.

[0069] (Modified example of reinforcement structure 19) In the reinforcing structure 19, a high-elongation material 90 was sandwiched between each of the plate bonding portion 54 and the U-rib bonding portion 52 and each part of the steel deck plate 12, but it is not limited to this. The high-stretch material 90 may be sandwiched between a portion of the adhesive portion 54 and the U-rib adhesive portion 52 and each part of the steel deck 12, or the high-stretch material 90 may be sandwiched between at least a portion of the plate adhesive portion 54 and the U-rib adhesive portion 52 and each part of the steel deck 12. Furthermore, each of the plate adhesive portion 54 and the U-rib adhesive portion 52 may be directly bonded to each part of the steel deck 12, for example.

[0070] Furthermore, in the reinforcing structure 19, the filler material 40 was not filled into the closed sections of the U-ribs 20 that do not pass over by the wheels 102 of the vehicle 100 running on the deck plate 14, or that are located in the second range 62 where the frequency of passage by the wheels 102 is lower than that of the first range 61, but this is not limited to this. For example, the configuration may include filling the closed sections of all U-ribs 20 with the filler material 40.

[0071] In the reinforcing structure 19, the pair of reinforcing members 50, 51 were not placed in the region 29S where the wheels 102 of the vehicle 100 traveling on the deck plate 14 do not pass, or where the frequency of the wheels 102 passing is lower than in the first region 61, in the second region 62. However, this is not limited to this. For example, the pair of reinforcing members 50, 51 may be placed in all of the regions 29R, 29S between the two U-ribs 20(A), 20(B).

[0072] Furthermore, in the reinforcing structure 19, the pair of reinforcing members 50 and 51 were arranged in the region 29R between the two U-ribs 20(A) and 20(B), as shown in Figure 1, but this is not limited to this configuration. For example, the configuration may consist of only one reinforcing member 50 or one reinforcing member 51 being arranged in the region 29R between the two U-ribs 20(A) and 20(B). In other words, the reinforcing structure of the present invention only requires that at least one reinforcing member be arranged in the region 29R between the two U-ribs 20(A) and 20(B).

[0073] (Modified example of reinforcing material 50) In the reinforcing members 50 and 51, the plate bonding portion 54 and the U-rib bonding portion 52 were formed in a plate shape, but this is not limited to this. For example, the reinforcing members 50 and 51 may be formed in a block shape (for example, a polygonal prism shape), and the reinforcing members 50 and 51 only need to have bonding portions that are bonded to the deck plate 14 and the U-rib 20, respectively.

[0074] Furthermore, in the reinforcing members 50 and 51, the plate bonding portion 54 and the U-rib bonding portion 52 were connected by a connecting portion 55, but this is not limited to that. For example, in the reinforcing members 50 and 51, the plate bonding portion 54 and the U-rib bonding portion 52 may be connected without going through the connecting portion 55 (i.e., the R-shaped portion).

[0075] Furthermore, in the reinforcing materials 50 and 51, the fibers in the plate bonding portion 54 and the U-rib bonding portion 52 were oriented in two orthogonal directions, but this is not limited to this configuration. For example, the fibers in the plate bonding portion 54 and the U-rib bonding portion 52 may be oriented in one direction.

[0076] The present invention is not limited to the embodiments described above, and various modifications, changes, and improvements are possible without departing from the spirit of the invention.

[0077] <Note> The first embodiment of the reinforcing structure is a reinforcing structure for a steel deck plate having a deck plate and longitudinal ribs extending along the bridge axis direction and welded to the lower surface of the deck plate, forming a closed cross section with the deck plate, comprising: a reinforcing material made of fiber-reinforced plastic that is bonded from the lower surface of the deck plate to the outer surface of the longitudinal ribs; and a filler made of resin mortar that is filled into the closed cross section of the longitudinal ribs to which the reinforcing material is bonded.

[0078] Thus, in the reinforcement structure of the first embodiment, the reinforcing material is bonded from the lower surface of the deck plate to the outer surface of the longitudinal rib. Furthermore, the filler material is filled into the closed cross-section of the longitudinal rib to which the reinforcing material is bonded. This suppresses the deformation of the deck plate and longitudinal rib in response to the load of objects passing over the deck plate, and reduces the stress acting on the weld between the deck plate and the longitudinal rib. As a result, the occurrence of fatigue cracks in the weld between the deck plate and the longitudinal rib can be suppressed.

[0079] Furthermore, in the reinforcement structure of the first embodiment, since the reinforcing material is made of fiber-reinforced plastic, the reinforcing material can be made lighter compared to when the reinforcing material is made of steel plate. Also, since the filler material is made of resin mortar, the filler material can be made lighter compared to when the filler material is made of mortar or cement that does not contain resin. As a result, it is possible to suppress the increase in dead load of the steel deck plate while suppressing the occurrence of fatigue cracks in the welded joint between the deck plate and the longitudinal rib.

[0080] In the reinforcing structure of the second embodiment, the filler has a specific gravity of 1.2 or less.

[0081] Conventionally, resin-free mortar and cement, which have been used as fillers, have a specific gravity exceeding 1.2. In contrast, in the second embodiment, since the filler has a specific gravity of 1.2 or less, it is possible to suppress the increase in dead load of the steel deck while suppressing the occurrence of fatigue cracks in the welded joint between the deck plate and the longitudinal rib.

[0082] In the third embodiment of the reinforcing structure, the reinforcing material includes fibers oriented in two directions in a plan view: in the direction of the bridge axis and in the direction perpendicular to the bridge axis.

[0083] Therefore, even when a load is applied to the reinforcing material in the direction of the bridge axis and perpendicular to the bridge axis, it can withstand the load, and the stress acting on the welds between the deck plate and the longitudinal ribs, and between the deck plate and the transverse ribs, can be reduced. As a result, compared to a configuration in which the fibers of the reinforcing material are oriented in only one direction, the occurrence of fatigue cracks in the welds between the deck plate and the longitudinal ribs can be suppressed.

[0084] In the reinforcing structure of the fourth embodiment, the filler is filled into a closed section of at least one of two adjacent longitudinal ribs perpendicular to the bridge axis, a pair of the reinforcing members are arranged in the region between the two longitudinal ribs, one of the pair of reinforcing members is bonded from the lower surface of the deck plate to the outer surface of one of the two longitudinal ribs, and the other of the pair of reinforcing members is bonded from the lower surface of the deck plate to the outer surface of the other of the two longitudinal ribs.

[0085] Therefore, compared to a configuration where only one reinforcing member is placed in the region between two adjacent longitudinal ribs, the stress acting on the weld between the deck plate and the longitudinal ribs in the region between the two longitudinal ribs can be reduced. As a result, the occurrence of fatigue cracks in the welds between the deck plate and the longitudinal ribs, and between the transverse ribs and the deck plate can be suppressed.

[0086] In the fifth embodiment of the reinforcing structure, the filler material is filled into the closed cross-section of the longitudinal ribs located in a first range through which the wheels of a vehicle traveling on the deck plate pass, and the filler material is not filled into the closed cross-section of the longitudinal ribs located in a second range through which the wheels of a vehicle traveling on the deck plate do not pass, or through which the frequency of such wheel passage is lower than in the first range.

[0087] Therefore, compared to a configuration in which filler material is filled into all closed sections of the steel deck, this configuration can efficiently support the wheel load of vehicles traveling on the deck plate.

[0088] In the sixth embodiment of the reinforcing structure, the reinforcing material is arranged in the region between two adjacent longitudinal ribs perpendicular to the bridge axis, which is located in a first range through which the wheels of a vehicle traveling on the deck plate pass. The reinforcing material is not arranged in the region located in a second range through which the wheels of a vehicle traveling on the deck plate do not pass, or through which the frequency of such wheel passage is lower than in the first range.

[0089] Therefore, compared to a configuration in which reinforcing material is placed in the region between all longitudinal ribs in the steel deck, This allows for efficient support of the wheel load of vehicles traveling on the deck plate.

[0090] In the seventh embodiment of the reinforcing structure, the reinforcing material is bonded to at least one of the deck plate and the longitudinal ribs with a high-elongation material having a higher elongation than the reinforcing material sandwiched between them.

[0091] Therefore, compared to a configuration in which the reinforcing material is bonded in direct contact with both the deck plate and the longitudinal ribs, the reinforcing material follows the deformation of the steel deck plate, and peeling of the reinforcing material is suppressed. [Explanation of Symbols]

[0092] 10 Bridges 11 Paving materials 12 Steel deck slab 14 Deck Plates 14A Top 14B Bottom 16 Main digit 18 transverse ribs 18A Web 18B flange 18C recess 18E Scallop 18F Scallop 19 Reinforcement structure 20 U-rib 22 Bottom wall section 23 Side wall section 25 Side wall section 29R area 29S area 40 Filler 50 Reinforcement material 51 Reinforcement material 52 U-rib bonding section 52A One end 54 Plate bonding area 54A Top 55 Connecting part 55P Center 55R radius 61 First Range 62 Second Range 71 Welded section 72 Welded parts 73 Welded section 90 High elongation material 92 Leveling material 98 Retaining member 100 vehicles 102 wheels

Claims

1. Deck plate and A longitudinal rib extends along the bridge axis direction and is welded to the lower surface of the deck plate, forming a closed cross-section with the deck plate, A reinforcement method for reinforcing a steel deck having, The process involves filling the closed cross-section of the longitudinal rib with a filler made of resin mortar, A step of bonding a reinforcing material made of fiber-reinforced plastic from the lower surface of the deck plate to the outer surface of the longitudinal rib, Includes, The filling of the aforementioned filler is carried out before the bonding of the reinforcing material. Methods for reinforcing steel decks.

2. The reinforcing member has a plate bonding portion that is bonded to the lower surface of the deck plate, a rib bonding portion that is bonded to the outer surface of the longitudinal rib, and a connecting portion that connects the plate bonding portion and the rib bonding portion. The aforementioned connecting portion is formed in an arc shape when viewed in the direction of the bridge axis, In the step of bonding the reinforcing material, the reinforcing material is bonded with a high-stretch material having a higher elongation than the reinforcing material sandwiched between the deck plate and the longitudinal ribs and the reinforcing material, and with a leveling material interposed in the gap between the deck plate and the longitudinal ribs and the high-stretch material at the connecting portion. The method for reinforcing a steel deck according to claim 1.

3. In the step of bonding the reinforcing material, the high-stretch material is sandwiched between the deck plate and the longitudinal ribs and the reinforcing material, and the reinforcing material is bonded with adhesive. The high-stretch material is provided in direct contact with the surfaces of the deck plate and the longitudinal ribs at the plate bonding portion and the rib bonding portion. The adhesive is interposed between the high-elongation material and the reinforcing material. The method for reinforcing a steel deck according to claim 2.

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