JP2002173912A - Steel floorslab reinforcing structure in steel road bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel floorslab reinforcing structure in a steel road bridge capable of easily and inexpensively reinforcing a steel floorslab. SOLUTION: In this steel road bridge 1, floor framing 20 composed of main girders 21 and horizontal beams 22 is integrally constructed on an under surface of the steel floorslab 10, and main girders 11 of the floor framing 20 are supported by a pier 2 by bearings 3. The reinforcing structure is installed by fastening and fixing a reinforcing horizontal beam 41 between the steel main girders 11, a support metal fitting 42 is arranged in a position corresponding to vertical ribs 12 of the reinforcing horizontal beam 41, and the vertical ribs 12 are supported by support metal fitting 42.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for reinforcing a steel slab in a steel road bridge having a steel slab supported by a steel main girder.

[0002]

2. Description of the Related Art As a bridge structure such as a viaduct, there is a steel road bridge formed by supporting a steel slab formed by combining steel plates with a main girder made of steel plates extending in the bridge axis direction.

[0003] As one example of such a steel road bridge using a steel slab, a cross section of a steel slab having a steel slab and a steel main girder integrally formed as shown in FIG. A plurality of vertical ribs 62, horizontal ribs 63, and main girders 64 are combined on the lower surface of the deck plate 61 and welded and integrated.

[0004]

In recent years, however, it has been recently necessary to repair steel bridges using steel decks as described above due to aging and to prepare for natural disasters such as increased traffic and earthquakes. There is a demand for reinforcement. Furthermore, since the steel slab girder is lighter than the RC slab formed by concrete reinforced by reinforcing steel, the horizontal rib spacing is set to be large, and as a result, a large stress is generated in the vertical rib, There is a need to address the fatigue that occurs at the weld site.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a reinforcing structure of a steel deck in a steel road bridge capable of reinforcing the steel deck easily and at low cost. .

[0006]

In order to achieve the above object, a reinforcing structure of a steel slab in a steel road bridge according to the present invention comprises a steel slab having a longitudinal rib member on a lower surface of a steel plate, and a steel slab orthogonal to a bridge axis. In a steel road bridge supported by a plurality of steel girders extending in the bridge axis direction provided at a predetermined interval in a direction in which the reinforcing ribs do not interfere with the vertical rib members between the steel girders, The steel main girder is fastened and fixed and installed, and a supporting member is provided at a position corresponding to the vertical rib member of the reinforcing horizontal girder member, and the vertical rib member is supported by the supporting member. It is characterized by having.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of a steel road bridge to which a structural example of a steel deck slab according to the present invention is applied, showing cross sections of different portions on the left and right with a center line interposed therebetween. The cross section of the portion showing the existing cross beam 22 and the left half are the cross sections of the portion showing the reinforcing structure 40. FIG. 2 is an enlarged transverse sectional view of the reinforcement structure 40 corresponding to the left side, and FIG. 3 is a longitudinal sectional view thereof.

In the illustrated steel road bridge 1, a floor set 20 composed of a main girder 21 as a steel main girder and a horizontal girder 22 is integrally formed on the lower surface of a steel deck slab 10, and the main girder 11 of the floor set 20 is provided. It is supported on a pier 2 via a bearing 3. A pavement 30 of a predetermined thickness is constructed on the upper side of the steel deck 10 by asphalt or the like.

The steel floor slab 10 is configured such that a vertical rib 12 as a vertical rib member is arranged on a lower surface of a steel plate deck plate 11 having a predetermined thickness so as to extend in the bridge axis direction.

The vertical rib 12 is formed of a steel plate having a predetermined thickness into a substantially U-shape having a cross section open to the outside, and is welded and fixed to the lower surface of the deck plate 11 at an end edge thereof. It forms a closed section extending in the bridge axis direction.

The floor set 20 includes a main girder 21 extending in the bridge axis direction.
Are disposed at predetermined intervals in a direction perpendicular to the bridge axis, and between and outside the main beams 21, cross beams 2 perpendicular to the bridge axis are provided.
2 are arranged at predetermined intervals in the bridge axis direction, and are integrally connected to the lower surface of the steel slab 10 by welding.

The main girder 21 is a steel girder having an I-shaped cross section provided with a flange having a predetermined width at a lower end edge of an abdominal plate 21W having a predetermined height,
The upper edge of the abdominal plate 21W is fixed to the deck plate 11 of the floor slab 10 by welding.

The horizontal girder 22 is a steel girder having an I-shaped cross section similar to the main girder 21, and its abdominal plate 22 W abuts against the abdominal plate 21 W of the main girder 21 in an orthogonal state and is connected and fixed by welding. The upper edge of the abdominal plate 22 </ b> W is
And welded to the deck plate 11 and the vertical ribs 12 by welding.

In the steel road bridge 1 having the above structure, a plurality of reinforcing structures 40 are provided between the cross beams 22 arranged at predetermined intervals in the bridge axis direction.
Are arranged at predetermined intervals.

In the reinforcing structure 40, a reinforcing cross girder 41 as a reinforcing cross girder member is installed between the main girder 21 of the floor set 20 and extended to the outside, and the reinforcing cross girder 41 is supported by a plurality of support members as support members. A metal fitting 42 is provided to support the steel slab 10.

The reinforcing cross beam 41 has a so-called I-shaped cross section in which a flange 41U, 41L having a predetermined width is formed on an upper edge and a lower edge, respectively, of a plate shape having a predetermined width. A flange 41S is formed, and the fastening flange 41S is fastened to the abdominal plate 21W of the main girder 21 by high tension bolts and nuts, and the upper edge (upper surface of the upper flange 41U) is connected to the vertical rib of the steel floor slab 10. 12 is provided in a state separated by a predetermined distance from the lower surface of the light emitting element 12.

As shown in FIG. 4 (A) which is an enlarged view of a portion A in FIG. 2 and FIG. 4 (B) which is a sectional view taken along the line BB of FIG. A support portion 42A, which is formed by vertically dividing a substantially similar shape that is slightly larger than the vertical rib 12 having a predetermined interval from the outer surface into two portions at the center, is formed by the support rib 42.
It is formed to be fixed to the plate-like mounting portion 42C via B. Then, the mounting portion 42C is fastened and fixed to the upper surface of the upper flange 41U of the reinforcing horizontal girder 41 by bolts and nuts, and the support portions 42B are provided on both sides of each vertical rib 12 so as to correspond to the vertical ribs 12, respectively. The gap between the upper surface of the support portion 42A and the vertical rib 12 is filled with epoxy mortar 43.

The installation of the support fittings 42 on the reinforcing cross beams 41 and the filling of the epoxy mortar 43 are shown in FIG.
(A) As shown on the left side in the middle, a vertical rib 1
2 can be performed by inserting from the side of No. 2 and fastening the mounting portion 42C to the reinforcing cross beam 41.

In the reinforcing structure 40 as described above, the cross beams 22
The reinforcing cross beam 41 erected between the main beams 11 at a portion where the vertical ribs 12 are not disposed supports the vertical ribs 12 (that is, the steel floor slab 10) via the epoxy mortar 43 and the support fitting 42. As a result, the weight of the steel slab 10 at the portion between the cross girders 22 is transmitted to the main girder 11 via the reinforcing structure 40, and the steel slab 10 is supported on average by the girder set 20, It is possible to reinforce and reduce the stress acting on the vertical ribs 12 to reduce the fatigue generated at the welded portion.

FIG. 5 shows another configuration example of the reinforcing structure.
(A) shows a horizontal sectional view, and (B) shows a vertical sectional view. This configuration is different from the above configuration example in the support structure of the steel slab 10 (vertical ribs 12) by the reinforcing cross beams 41 '.

The reinforcing cross beam 41 'has a C-shaped cross section in which a flange projects in one direction. The reinforcing cross beam 41' and the steel slab 10 (vertical rib 12) are connected by a connecting angle 44 as a connecting member. Is what is being done. That is, the lower part of the connection angle 44 having an L-shaped cross section is fastened to the belly plate of the reinforcing cross beam 41 ′ on the side where the flange does not protrude, and the upper end of the connection angle 44 is fastened to the side surface of the vertical rib 12. Is what it is.

FIG. 6 shows a structural example of a reinforcing structure for a steel slab 10 'in which an I-shaped vertical rib 12' is fixed to the lower surface of the deck plate 11, and FIG.
(B) is a longitudinal sectional view.

In this configuration, as in the configuration example shown in FIG. 5, a reinforcing cross beam 41 'having a C-shaped cross section and a vertical rib 12' are connected by a connecting angle 44 having an L-shaped cross section.

[0025]

As described above, according to the reinforcing structure of the steel slab in the steel road bridge according to the present invention, the reinforcing horizontal girder member is provided on the lower side which does not interfere with the vertical rib member between the steel main girder. Along with being fixedly fixed to the girder and being erected, a support member is provided at a position corresponding to the vertical rib member of the reinforcing horizontal girder member, and the support member is configured to support the vertical rib member. The weight of the slab is transmitted to the steel girder via the support member and the reinforcing girder member, so that the steel slab can be reinforced so as to be supported on average by the steel girder and the stress acting on the longitudinal ribs is reduced. It is possible to reduce the fatigue generated at the welding site. In addition, since the reinforcing cross beam member may have a simple shape, the installation workability is good, and the support member can be easily installed on the reinforcing cross beam member.

That is, the steel slab can be reinforced easily and at low cost.

[Brief description of the drawings]

FIG. 1 is a transverse sectional view of a steel road bridge to which a structural example of a steel deck slab reinforcement structure according to the present invention is applied.

FIG. 2 is an enlarged cross-sectional view of a reinforcing structure portion.

FIG. 3 is a longitudinal sectional view of FIG.

4A is an enlarged view of a portion A in FIG. 2, and FIG.
It is B sectional drawing.

5A and 5B show another configuration example of the reinforcing structure, in which FIG. 5A is a cross-sectional view and FIG.

6A and 6B show still another configuration example of the reinforcing structure, in which FIG. 6A is a cross-sectional view and FIG.

FIG. 7 is a sectional view of a steel deck slab girder as a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel road bridge 10 Steel deck 11 Deck plate (Steel board) 12, 12 'Vertical rib (Vertical rib member) 21 Main girder (Main steel girder) 40 Reinforcement structure 41, 41' Reinforced horizontal girder (Reinforced horizontal girder member ) 42 support bracket (support member) 44 connecting angle (support member)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mamoru Sugizaki 5-30-13 Toyo, Koto-ku, Tokyo F-term in Ismic Co., Ltd. 2D059 AA16 GG40

Claims (1)

[Claims] 1. A steel slab having a longitudinal rib member on the lower surface of a steel plate substrate supported by a plurality of steel girders extending in the bridge axis direction and arranged at predetermined intervals in a direction orthogonal to the bridge axis. In a steel road bridge, a reinforcing horizontal girder member is fastened and fixed to the steel main girder between the steel main girders so as not to interfere with the vertical rib members, and the vertical rib member of the reinforcing horizontal girder member is provided. A support structure is provided at a position corresponding to the above, and the vertical rib member is supported by the support member.