Easy-to-construct steel crossbeam structure and bridge construction method

Abstract

The present invention relates to a steel crossbeam structure that is easy to construct, a bridge equipped with the same, and a method for constructing a bridge, wherein the structure comprises: an attachment plate (200) provided on a crossbeam installation part (110) of a girder (100); a curved member (300) fixed to the attachment plate (200) provided on the crossbeam installation part (110) of an adjacent girder (100); a connecting bracket (400) fixed to the curved member (300); and a crossbeam (500) fastened by a bolt (700) between the connecting bracket (400) fixed to the adjacent girder (100).

Description

Technology Field

[0001] The present invention relates to the structure of a steel crossbeam installed between a plurality of girders and a bridge construction method using the same.

[0002] This invention is based on the support of the following national research and development project.

[0003] Item name Details Project Unique Number 2025-RISE-14-004 Assignment Number 2025-RISE-14-004 Buddha name Ministry of Education Project Management (Specialized) Agency Name Jeollanam-do RISE Center Research Project Name Jeonnam Regional Innovation Center University Support System (RISE) Research Project Title R. Regional Innovation Challenge Name of the project implementing organization Dongshin University Research period 2025. 08. 01. ~ 2030. 02. 28. Background Technology

[0004] A bridge is a civil engineering structure that connects spaces and provides a passage for the movement of people, vehicles, trains, water resources, cargo, and more.

[0005] A multi-column concrete bridge is constructed by installing girders in multiple rows, placing a deck on top of the girders, and paving; it is common practice to install transverse beams between the girders.

[0006] The installation of transverse beams is intended to bind several independent girders together so that they behave as a single plate, thereby distributing the load applied to some girders to other girders through lateral load distribution, increasing torsional stiffness, preventing overturning and buckling of the girders, and enabling them to firmly resist lateral loads such as earthquakes or wind loads.

[0007] The conventional method of installing transverse beams on PC or PSC girders involved the installation of concrete transverse beams. However, this method had disadvantages, such as increased construction costs and a higher risk of safety accidents due to working at heights, as it required excessive on-site work including rebar assembly, formwork installation, concrete pouring, and formwork removal.

[0008] In addition, although a method of installing steel between girders was used, the complex fastening structure led to increased construction time and costs, and when transverse beams were installed at an angle rather than perpendicular to the girders, there was a problem with reduced durability and strength of the welded joints.

[0009] Therefore, it was necessary to develop a steel crossbeam joint structure and a bridge construction method capable of solving the aforementioned conventional problems. Prior art literature

[0010] Korean Patent Publication No. 10-2501064 The problem to be solved

[0011] To improve upon the problems of the conventional technology described above, the present invention aims to provide a steel crossbeam structure and a bridge construction method that are easy and simple to construct and have excellent durability and strength. means of solving the problem

[0012] The present invention provides a steel crossbeam structure that is easy to construct, comprising: an attachment plate (200) provided on a crossbeam installation part (110) of a girder (100); a curved member (300) fixed to the attachment plate (200) provided on the crossbeam installation part (110) of an adjacent girder (100); a connecting bracket (400) fixed to the curved member (300); and a crossbeam (500) fastened by a bolt (700) between the connecting bracket (400) fixed to the adjacent girder (100).

[0013] The planar shape of the above-mentioned curved member (300) is semicircular, and the curved member (300) fixed to an adjacent girder (100) is characterized by having convex surfaces facing each other.

[0014] The above connecting bracket (400) is provided as a flat plate, and the connecting bracket (400) is fixed to the outside of the convex surface of the curved member (300) by welding, characterized in that welding is possible in a state where the outer tangent line of the curved member (300) and the axis line of the connecting bracket (400) are always perpendicular when viewed in a flat plane.

[0015] The above connecting bracket (400) is provided with a plurality of bolt holes (410), and the web (530) of the cross beam (500) is provided with a bolt hole (531), and the cross beam (500) is connected and fixed by fastening a bolt (700) to the bolt hole (410) of the connecting bracket (400) and the bolt hole (531) of the cross beam (500).

[0016] A pair of attachment plates (200) provided on the cross beam installation section (110) of the girder (100) are provided with the cross beam installation section (110) in between, and the pair of attachment plates (200) are connected by a steel rod (600).

[0017] The present invention provides a bridge construction method for installing a steel crossbeam between a plurality of girders, comprising the steps of: (a) installing a plurality of substructures (1) spaced apart in the bridge axis direction; (b) placing a plurality of girders (100) on top of the substructures (1) spaced apart from each other in the direction perpendicular to the bridge axis; (c) installing the steel crossbeam structure between the plurality of girders (100); and (d) constructing a deck plate on top of the plurality of girders (100).

[0018] The present invention provides a bridge constructed by the above bridge construction method.

[0019] The present invention provides a bridge comprising: a plurality of substructures (1) installed so as to be spaced apart in the longitudinal direction; a plurality of girders (100) installed on the upper portion of the substructures (1) so as to be spaced apart from each other in the longitudinal direction perpendicular to the bridge; a crossbeam structure provided between the plurality of girders (100); and a deck plate provided on the upper portion of the plurality of girders (100). Effects of the invention

[0020] The easy-to-construct river crossbeam structure and bridge construction method of the present invention have the following effects.

[0021] Since welding is possible when the outer tangent line of the semicircular curved member (300) and the axis line of the connecting bracket (400) are always at a right angle, the connecting bracket can be welded firmly.

[0022] Not only when the transverse beam is installed perpendicular to the girder, but also when it is installed diagonally to the girder, the connecting bracket can always be welded perpendicularly to the curved member without acute-angle welding, thereby forming a robust steel transverse beam installation structure without weak points; furthermore, construction is easy even when the transverse beam is installed diagonally.

[0023] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by a person skilled in the art from the description in the claims. Brief explanation of the drawing

[0024] FIGS. 1 and 2 are a front view and a plan view of an embodiment in which the steel crossbeam structure of the present invention is applied (an embodiment in which the crossbeam is installed in a direction perpendicular to the girder). FIG. 3 is a front view and a plan view of another embodiment to which the steel crossbeam structure of the present invention is applied (an embodiment in which the crossbeam is installed in an inclined direction with respect to the girder). FIG. 4 is an exploded front view and plan view of the steel crossbeam structure of the present invention. Figure 5 illustrates that the connecting bracket is always welded to the curved member in a perpendicular direction. FIG. 6 is a perspective view of a girder to which the steel crossbeam structure of the present invention is applied. Specific details for implementing the invention

[0025] Embodiments of the present invention are described in detail below with reference to the attached drawings so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are given similar reference numerals. Throughout the specification, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0026] First, the easy-to-construct steel crossbeam structure of the present invention is described, and then a bridge construction method and a bridge to which the steel crossbeam structure is applied are described.

[0027] The easy-to-construct steel crossbeam structure of the present invention can be installed between a plurality of girders (100) provided on the upper part of a bridge substructure (1).

[0028] The bridge substructure (1) is a structure that supports the bridge superstructure and transmits the load of the superstructure to the ground, and includes abutments, piers, foundations, etc.

[0029] The girder to which the present invention is applied can be a PC (Precast Concrete) girder or a PSC (Prestressed Concrete) girder.

[0030] The girder (100) to which the present invention is applied may be provided with a cross-section of the member that is thicker than other parts (110), and may be provided with a shear key (120) on the upper surface to increase the adhesion strength with the cast-in-place concrete.

[0031] The cross-sectional shape of the girder (100) can be made to have an overall I shape, and the cross-sectional shape of the cross beam installation part (110) can be made to have a rectangular shape.

[0032] The steel crossbeam structure of the present invention may include an attachment plate (200), a curved member (300), a connecting bracket (400), a crossbeam (500), and a steel rod (600).

[0033] The above attachment plate (200) can be provided on the cross beam installation part (110) of the girder (100).

[0034] The above attachment plates (200) may be provided as a pair on a single girder, and a pair may be provided with the above cross beam installation part (110) in between, and a plurality of steel rods (600) may be connected and fixed between the pair of attachment plates (200).

[0035] The above attachment plate (200) and steel rod (600) can be pre-assembled and provided when manufacturing the girder, and the steel rod (600) can be assembled to be fixed to the reinforcing bar inside the girder.

[0036] The above curved member (300) is fixed to the outside of the attachment plate (200). Fixing can be achieved by welding, bolt connection, etc.

[0037] The above curved member (300) may have a semicircular planar shape.

[0038] A curved member (300) fixed to an adjacent girder (100) is provided with semicircular convex surfaces facing each other.

[0039] The above connecting bracket (400) may be provided as a flat plate.

[0040] The above connecting bracket (400) is fixed to the outside of the convex surface of the curved member (300) by welding.

[0041] In the present invention, a curved member (300) is provided between the attachment plate (200) and the connecting bracket (400) so that the connecting bracket (400) can be firmly welded.

[0042] That is, in the present invention, by providing a semicircular convex surface on the curved member (300) when viewed in a planar view, the curved member (300) and the connecting bracket (400) can be welded in a state where they are always at a right angle, and as a result, the weld between the curved member (300) and the connecting bracket (400) can be made solid without any weak points.

[0043] Accordingly, based on the plane, the connecting bracket (400) can be welded perpendicular to the convex outer surface of the curved member (300) not only when the cross beam (500) is installed perpendicular to the girder (Fig. 1), but also when the cross beam (500) is installed diagonally to the girder (Fig. 2).

[0044] The fact that the connecting bracket (400) always maintains a state perpendicular to the convex outer surface of the curved member (300) means that welding is possible when the outer tangent of the curved member (300) and the axis of the connecting bracket (400) are always at a right angle, as shown in FIG. 4.

[0045] On the other hand, when the connecting bracket (400) is directly welded to the attachment plate (200) without the curved member (300), when the cross beam (500) is installed perpendicular to the girder (Fig. 1), the connecting bracket (400) can be welded in a state perpendicular to the attachment plate (200), but when the cross beam (500) is installed diagonally to the girder (Fig. 2), the connecting bracket (400) is welded diagonally to the attachment plate (200), so a weak point occurs and it becomes difficult to perform a solid weld.

[0046] In the present invention, by providing a curved member (300) between the attachment plate (200) and the connecting bracket (400), the connecting bracket (400) can be firmly welded, and as a result, the installation structure of the steel crossbeam can be made robust.

[0047] The above connecting bracket (400) is provided with a plurality of bolt holes (410) for connecting the cross beam (500).

[0048] Before integrating the attachment plate (200) and the steel rod (600) with the girder, it is preferable to pre-weld the curved member (300) and the connecting bracket (400) to the attachment plate (200). However, it is not necessary to weld them in advance, and the curved member (300) and the connecting bracket (400) may be welded after the girder is manufactured.

[0049] The above cross beam (500) can be bolted between two connecting brackets (400) facing each other.

[0050] The above cross beam (500) may be provided as an I-beam or H-beam including an upper flange (510), a lower flange (520), and a web (530), and the web (530) is provided with a bolt hole (531) for fastening a bolt (700).

[0051] The cross beam (500) can be connected and fixed by fastening a bolt (700) to the bolt hole (410) of the connecting bracket (400) and the bolt hole (531) of the cross beam (500).

[0052] The upper flange (510) and lower flange (520) of the cross beam (500) each cover the upper and lower ends of the curved member (300), and both ends of the upper flange (510) and lower flange (520) are welded to the attachment plate (200) so that the cross beam (500) can be firmly installed.

[0053] In some cases, the upper flange (510) and lower flange (520) of the cross beam (500) may be provided so as not to cover the top and bottom of the curved member (300) or to cover only a part of it.

[0054] Below, a bridge construction method using the steel beam structure described above is explained.

[0055] To construct the bridge, a plurality of substructures (1) are first installed so as to be spaced apart in the direction of the bridge axis.

[0056] The girder (100) can be manufactured simultaneously with the installation process of the substructure (1). When manufacturing the girder (100), the attachment plate (200), the curved member (300), the connecting bracket (400), and the steel rod (600) can be manufactured as a single unit in advance.

[0057] When the construction of the substructure (1) is completed, a plurality of girders (100) are placed on the upper part of the substructure so as to be spaced apart from each other in a direction perpendicular to the bridge axis.

[0058] The steel crossbeam structure of the present invention is installed between a plurality of mounted girders (100). When manufacturing the girders (100), if the steel rod (600), attachment plate (200), curved member (300), and connecting bracket (400) are pre-installed, the crossbeam (500) is connected and fixed by fastening it with a bolt (700).

[0059] Once the installation of multiple girders (100) and crossbeams is complete, a bridge deck is constructed on top of the multiple girders (100).

[0060] The bridge deck can be provided as any one of a PC deck, cast-in-place concrete, or half deck.

[0061] The bridge of the present invention can be used as an application facility for utilizing drones.

[0062] One way to utilize drones on bridges is for safety inspections and maintenance. Since bridges are often difficult for humans to access directly, drones can solve this problem.

[0063] Drones can take close-up shots of blind spots that are difficult for humans to see directly, such as the underside of bridge superstructures and the tops of piers, and use high-resolution cameras to detect minute defects, allowing for the precise identification of concrete cracks, exposed rebar, corrosion, and loosened bolts. Additionally, drones equipped with thermal imaging cameras can detect invisible internal bridge damage, leaks, and concrete spalling through temperature differences.

[0064] In addition, a drone can fly over the entire bridge to perform photogrammetry and build a 3D digital model based on the photogrammetry data. Through this 3D model, data can be constructed to accurately determine the current condition of the bridge and measure the location and size of damaged areas in millimeters. Additionally, the 3D model can be updated regularly to manage the history of the bridge.

[0065] The present invention has been described with reference to the embodiments illustrated in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom.

[0066] Therefore, the true scope of technical protection of the present invention should be determined by the technical concept of the appended claims. Explanation of the symbols

[0067] 100. Girder 110. Horizontal beam installation section 120. Shear Key 200. Attachment plate 300. Curved member 400. Connecting bracket 410. Bolt hole 500. Horizontal beam 510. Upper flange 520. Lower flange 530. Web 531. Bolt hole 600. Gangbong 700. Bolt 1. Substructure

Claims

Claim 1 In a steel crossbeam structure connecting multiple girders provided on the upper part of a bridge substructure, the structure comprises: an attachment plate (200) that is fixed to the outer surface of a crossbeam installation part (110) provided on a girder (100), is provided as a flat plate, and is provided in a direction parallel to the longitudinal direction of the girder (100); a curved member (300) that is fixed to the attachment plate (200) provided on the crossbeam installation part (110) of an adjacent girder (100), has a planar shape that is semicircular, and has both ends in a horizontal direction parallel to the longitudinal direction of the girder (100) fixed to the attachment plate (200); and a connecting bracket (400) that is provided as a flat plate, is provided with multiple bolt holes (410), and is fixed to the curved member (300). A cross beam (500) is included, comprising an upper flange (510), a lower flange (520), and a web (530), and is bolted (700) between a connecting bracket (400) fixed to an adjacent girder (100). A curved member (300) fixed to an adjacent girder (100) is provided such that its convex surfaces face each other. The connecting bracket (400) is fixed to the outside of the convex surface of the curved member (300) by welding, and welding is possible in a state where the outer tangent line of the curved member (300) and the axis line of the connecting bracket (400) are always perpendicular when viewed in a planar view. A bolt hole (531) is provided in the web (530) of the cross beam (500), so that the bolt hole (410) of the connecting bracket (400) and the web (530) of the cross beam (500) A steel crossbeam structure that is easy to construct, characterized in that a crossbeam (500) is connected and fixed by fastening a bolt (700) to a bolt hole (531), a pair of attachment plates (200) fixed to a crossbeam installation part (110) of a girder (100) are provided with the crossbeam installation part (110) of the girder (100) in between, the pair of attachment plates (200) are connected by a steel rod (600), the upper flange (510) and the lower flange (520) of the crossbeam (500) each cover the upper and lower ends of the curved member (300), and both ends of the upper flange (510) and the lower flange (520) of the crossbeam (500) are welded to the attachment plate (200). Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 A bridge construction method for installing a cross beam between multiple girders, comprising: (a) a step of installing multiple substructures (1) spaced apart in the direction of the bridge axis; (b) a step of placing multiple girders (100) on top of the substructures (1) spaced apart from each other in the direction perpendicular to the bridge axis; (c) a step of installing the steel cross beam structure of claim 1 between the multiple girders (100); and (d) a step of constructing a deck plate on top of the multiple girders (100). Claim 7 A bridge constructed by the construction method of Paragraph 6. Claim 8 A bridge comprising: a plurality of substructures (1) installed so as to be spaced apart in the direction of the bridge axis; a plurality of girders (100) installed on the upper part of the substructures (1) so as to be spaced apart from each other in the direction perpendicular to the bridge axis; a steel crossbeam structure of claim 1 provided between the plurality of girders (100); and a deck plate provided on the upper part of the plurality of girders (100).

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