Steel cross-beam capable of compensating for the lateral curvature and skew of PSC girders

Abstract

The present invention relates to a steel transverse beam capable of correcting transverse bending and skew of a PSC girder, wherein a bracket fixedly coupled to the side of the PSC girder is configured to be rotatable with the axis of the steel transverse beam as a rotation axis, thereby simultaneously correcting transverse bending or skew errors of the PSC girder and enabling stable transverse restraint without separate diagonal members by minimizing shear force or eccentric load at the joint of the transverse beam. The steel transverse beam capable of correcting transverse bending and skew of a PSC girder according to the present invention relates to a steel transverse beam installed transversely between a pair of spaced-apart PSC girders, comprising: a bracket coupled to the mutually facing sides of the PSC girders so as to be rotatable with the axis of the steel transverse beam as a rotation axis; and a transverse beam body provided between the facing brackets. The bracket is composed of a plurality of anchor bolts protruding from the side of the PSC girder, and is characterized by being composed of a fixing plate having a plurality of arc-shaped slots formed therein for fastening the anchor bolts, and a first joining plate provided vertically on the front of the fixing plate to which the end of the cross beam body is joined.

Description

Technology Field

[0001] The present invention relates to a steel cross beam capable of correcting transverse bending and skew of a PSC girder, wherein a bracket fixedly coupled to the side of the PSC girder is configured to rotate around the axis of the steel cross beam as a rotation axis, thereby simultaneously correcting transverse bending and skew errors of the PSC girder, and minimizing shear force or eccentric load at the joint of the cross beam to stably restrain the transverse direction without the need for separate diagonal members. Background Technology

[0003] Prestressed Concrete (PSC) girders are girders that introduce compressive force into concrete by tensioning tensioning members, offering excellent crack resistance and durability. Due to their superior economic efficiency and structural performance, these PSC girders are widely applied in various types of bridges, including road and railway bridges.

[0004] However, PSC girders may experience lateral deformation or lateral bending during the fabrication, transportation, installation, and erection processes due to the girder's self-weight, eccentric load, errors in prestress introduction, temperature changes, etc.

[0005] In particular, long-span PSC girders have a relatively small width compared to their cross-sectional height, so they lack sufficient lateral stiffness, and the risk of twisting or lateral buckling is high when the girder is installed alone, making it important to ensure construction stability.

[0006] Accordingly, in the past, temporary transverse beams, temporary beams, wire ropes, and temporary supports were installed during the construction phase to control the lateral movement between girders, or slab concrete was poured early on top of the girders to secure stability through a composite effect.

[0007] In particular, steel crossbeams are widely used because they are easy to manufacture and install.

[0008] Previously, steel crossbeams often used H-shaped steel or steel pipes (Registered Utility Model No. 20-0397213), but they were limited to simply maintaining the spacing between girders, which had limitations in actively correcting or adjusting the transverse bending that had already occurred in the girders. In addition, they could not sufficiently reflect the deformation characteristics of individual girders caused by manufacturing errors or installation errors.

[0009] In addition, Registered Patent No. 10-2083115 forms the transverse beam with steel plates and rotatably connects it to the side of the girder, thereby making it easily applicable to skew bridges and preventing damage to the transverse beam joint caused by relative displacement between adjacent girders.

[0010] However, the aforementioned registered patent can only handle axial relative displacement of the girder and cannot handle torsion, rotation, or gap errors.

[0011] In addition, Registered Patent No. 10-2177986 enables compensation for spacing errors between girders by utilizing a steel pipe transverse beam that can be extended in length.

[0012] However, the aforementioned registered patent has a problem in that if there is a difference in camber between two adjacent girders or if a superelevation occurs, lifting occurs at the joint between the transverse beam and the girder, and when correcting the curvature, the axis of the transverse beam twists, making it difficult to operate the screw jack. In addition, since the ends of the steel pipes must be cut diagonally in advance according to the installation angle of the transverse beam in skew bridges, etc., manufacturing is cumbersome, and it is difficult to respond to errors in on-site construction.

[0013] In addition, registered patents No. 10-1400226, No. 10-2139015, No. 10-2096744, etc. form a cross beam by assembling horizontal members and diagonal members, which are angle-type lightweight steel members. At this time, the length of the cross beam can be adjusted by forming the bolt fastening holes of the lightweight steel members into slots or by providing turnbuckles at the ends of the lightweight steel members.

[0014] However, while the above registered patents can handle errors in the spacing between girders, they have limitations in handling relative displacement caused by torsion along the transverse axis. In addition, structural over-confinement occurs, and there is a risk of local damage as excessive shear force is applied to the anchors and concrete during repeated adjustments. The problem to be solved

[0016] In order to solve the above problems, the present invention aims to provide a steel transverse beam capable of correcting transverse bending and skew of a PSC girder, which can simultaneously correct transverse bending and skew errors of a PSC girder.

[0017] The present invention aims to provide a steel transverse beam capable of correcting transverse bending and skew of a PSC girder, which enables stable transverse restraint without the need for separate diagonal members by minimizing shear force or eccentric load at the joint of the transverse beam. means of solving the problem

[0019] The present invention according to a preferred embodiment relates to a steel transverse beam installed transversely between a pair of spaced-apart PSC girders, comprising: a bracket rotatably coupled to mutually facing sides of the PSC girders with the axis of the steel transverse beam as a rotation axis; and a transverse beam body provided between the facing brackets. The bracket is composed of, wherein a plurality of anchor bolts are provided to protrude from the side of the PSC girder, and the bracket is composed of a fixing plate having a plurality of arc-shaped slots formed therein for fastening the anchor bolts, and a first joining plate provided vertically on the front of the fixing plate to which the end of the cross beam body is joined, and a second joining plate is provided at the end of the cross beam body to be rotatably joined to the first joining plate, wherein a first hinge shaft hole is formed in which a hinge pin is fastened in either the first joining plate or the second joining plate, and a first guide hole is formed in an arc shape with the first hinge shaft hole as the rotation center at a position spaced apart from the first hinge shaft hole to which a guide pin is fastened, and a second hinge shaft hole is formed in the other joining plate to which the hinge pin is coupled at a position corresponding to the first hinge shaft hole to which the hinge pin is coupled, and a second guide hole is formed in a circular shape at a position corresponding to the first guide hole to which the guide pin is fastened, and the The present invention provides a steel cross beam capable of correcting transverse bending and skew of a PSC girder, characterized in that the cross beam body is composed of a pair of steel pipe supports having a second connecting plate joined to the first connecting plate at the outer end, and a rotating sleeve provided between the pair of steel pipe supports and screw-coupled to the steel pipe supports.

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[0022] delete

[0023] delete Effects of the invention

[0025] According to the present invention, a steel crossbeam can be provided, comprising a crossbeam body installed between a bracket fixedly coupled to the side of a PSC girder and a bracket facing it, wherein the bracket is configured to be rotatable with the axis of the steel crossbeam as the axis of rotation.

[0026] Accordingly, firstly, it is possible to compensate for differences in gradient between adjacent PSC girders at the joint of steel transverse beams, differences in rotation angle between adjacent PSC girders in skew bridges, etc. Additionally, since the bracket can be rotatably adjusted and fixed to the side of the PSC girder, it is possible to prevent excessive shear force on the anchor bolts caused by rotational displacement or local damage to the concrete surrounding the anchor bolts.

[0027] Second, if the second connecting plate provided at the end of the cross beam body and the first connecting plate of the bracket are configured to rotate vertically, the height difference between adjacent PSC girders can be compensated.

[0028] Third, when the transverse beam body is composed of a pair of steel pipe supports and a rotating sleeve connecting the inner ends of the pair of steel pipe supports, the length of the transverse beam body can be adjusted to correct the lateral displacement caused by the lateral bending of the PSC girder. Brief explanation of the drawing

[0030] FIG. 1 is a perspective view illustrating the installation state of the steel cross beam of the present invention. FIG. 2 is a cross-sectional view illustrating the installation state of the steel cross beam of the present invention. FIG. 3 is a cross-sectional view illustrating an embodiment in which three PSC girders are installed. FIG. 4 is a perspective view illustrating the connection relationship between an anchor bolt and a bracket. Fig. 5 is a front view illustrating a bracket. FIG. 6 is a perspective view illustrating the state in which a bracket is attached to an anchor bolt. FIG. 7 is a perspective view illustrating a state in which a bracket is fixed to an anchor bolt. FIG. 8 is a perspective view illustrating the connection relationship between the bracket and the second connecting plate. FIG. 9 is a cross-sectional view illustrating the operational relationship of the second joining plate. FIG. 10 is an exploded perspective view illustrating the main body of the cross beam. Specific details for implementing the invention

[0031] The present invention will be described in detail below according to the attached drawings and preferred embodiments.

[0033] FIG. 1 is a perspective view illustrating the installation state of the steel cross beam of the present invention, FIG. 2 is a cross-sectional view illustrating the installation state of the steel cross beam of the present invention, and FIG. 3 is a cross-sectional view illustrating an embodiment in which three PSC girders are installed. FIG. 4 is a perspective view illustrating the connection relationship between an anchor bolt and a bracket, FIG. 5 is a front view illustrating a bracket, FIG. 6 is a perspective view illustrating the state in which a bracket is connected to an anchor bolt, and FIG. 7 is a perspective view illustrating the state in which a bracket is fixed to an anchor bolt.

[0034] As illustrated in FIGS. 1 to 3, the steel cross beam capable of correcting transverse bending and skew of the PSC girder according to the present invention relates to a steel cross beam (2) installed transversely between a pair of spaced-apart PSC girders (1), and is characterized by comprising: a bracket (3) which is rotatably connected to the mutually facing sides of the PSC girders (1) with the axis of the steel cross beam (2) as a rotation axis; and a cross beam body (4) provided between the facing brackets (3).

[0035] The present invention is intended to provide a steel cross beam (2) capable of correcting the transverse bending and skew of a PSC girder, which can simultaneously correct the transverse bending and skew error of the PSC girder (1) and minimize shear force or eccentric load at the joint of the steel cross beam (2), thereby enabling stable transverse restraint without separate diagonal members.

[0036] The present invention relates to a steel cross beam (2) installed transversely between a pair of adjacent PSC girders (1) spaced apart from each other in a multi-column concrete bridge in which PSC girders (1) are installed in multiple rows.

[0037] The above steel cross beam (2) is joined to the side of the PSC girder (1).

[0038] In the case where a reinforcing rib (12) is formed protrudingly on the side of the web (11) of a PSC girder (1) with an I-shaped cross section, the steel cross beam (2) can be joined to the reinforcing rib (12).

[0039] The above steel cross beam (2) is composed of a bracket (3) and a cross beam body (4).

[0040] The above bracket (3) is for joining a steel cross beam (2) to the side of a PSC girder (1) and is fixedly installed on each of the opposing sides of the two PSC girders (1).

[0041] In order to fix the bracket (3) to the PSC girder (1), a plurality of anchor bolts (13) may be installed on the PSC girder (1).

[0042] The above anchor bolt (13) can be embedded in advance during the fabrication of the PSC girder (1).

[0043] In the case of the inner girder, since steel cross beams (2) must be installed on both sides of the PSC girder (1), the anchor bolt (13) can be installed to penetrate the PSC girder (1) and protrude to both sides.

[0044] In the case of the outer girder, since the steel cross beam (2) is installed only on the inner side of the PSC girder (1), the anchor bolt (13) can be installed so as to protrude only on the inner side of the PSC girder (1).

[0045] A fixing plate (14) can be attached to one end of a plurality of anchor bolts (13) so that one end of the anchor bolt (13) can be firmly fixed inside the PSC girder (1) (Figs. 2, 4).

[0046] An anchor plate (15) may be provided on the side of the web of the PSC girder (1) where the bracket (3) is installed, so as to fix the position of a plurality of anchor bolts (13) and support the axial force of the steel cross beam (2) against the lateral load by bearing pressure.

[0047] The above anchor bolt (13) can penetrate the anchor plate (15) and have its end protrude outward.

[0048] The above cross beam body (4) is installed between the two opposing brackets (3).

[0049] With the two brackets (3) fixedly installed on the sides of the PSC girder (1), the cross beam body (4) can be installed between the two brackets (3).

[0050] The above bracket (3) is configured to rotate at a certain angle with the axis of the steel cross beam (2) as the axis of rotation in the transverse direction of the PSC girder (1).

[0051] Accordingly, it is possible to correct for differences in gradient between adjacent PSC girders (1) at the joint of the steel cross beam (2), differences in rotation angle between adjacent PSC girders (1) at skews, etc.

[0052] In addition, since the bracket (3) can be fixed to the side of the PSC girder (1) by rotational adjustment, it is possible to prevent excessive shear force from occurring on the anchor bolt (13) due to rotational displacement or local damage to the concrete surrounding the anchor bolt (13).

[0053] The above steel cross beams (2) can be installed such that a pair are spaced apart from each other vertically.

[0055] As illustrated in FIGS. 1, 4 to 7, a plurality of anchor bolts (13) are provided to protrude from the side of the PSC girder (1), and the bracket (3) may be composed of a fixing plate (31) having a plurality of arc-shaped slots (311) formed therein for fastening the anchor bolts (13), and a first joining plate (32) provided vertically on the front of the fixing plate (31) to which the end of the cross beam body (4) is joined.

[0056] The above bracket (3) may be composed of a fixing plate (31) for joining the bracket (3) to the side of the PSC girder (1) and a first joining plate (32) for joining the end of the cross beam body (4) to the bracket (3).

[0057] The above fixing plate (31) may have a slot (311) formed therein for fastening a plurality of anchor bolts (13) installed on the side of the PSC girder (1).

[0058] The plurality of slots (311) are formed in an arc shape so that the fixed plate (31) can be rotated around the axis of the steel cross beam (2).

[0059] At this time, the multiple slots (311) may have their arc centers located at the same point, and it is preferable that the center be located on the central axis of the steel cross beam (2) so that no twisting occurs in the cross beam body (4) (Fig. 5).

[0060] A first joining plate (32) may be provided on the front surface of the above-mentioned fixed plate (31) so as to protrude in a direction perpendicular to the fixed plate (31).

[0061] The above bracket (3) can adjust the angle of the fixing plate (31) by means of an arc-shaped slot (311). Therefore, even if a rotation angle occurs at the joint and the position of the anchor bolt (13) rotates from the correct position, the rotation angle can be corrected in the arc-shaped slot (311) so that the bracket (3) can be installed without a change in angle.

[0062] A bracket (3) can be installed so that an anchor bolt (13) is inserted into the slot (311) of the fixed plate (31), and after leveling the bracket (3), a nut (N) can be fastened to the anchor bolt (13) to fix the bracket (3) (Figs. 6, 7).

[0064] FIG. 8 is a perspective view illustrating the connection relationship between the bracket and the second connecting plate, and FIG. 9 is a cross-sectional view illustrating the operation relationship of the second connecting plate.

[0065] As illustrated in FIGS. 8, 9, etc., a second joining plate (41) that is rotatably joined to the first joining plate (32) may be provided at the end of the cross beam body (4).

[0066] Due to differences in elevation between girders, gradients of the bridge superstructure along the transverse axis, etc., the levels of adjacent PSC girders (1) may not match each other.

[0067] Therefore, to compensate for the relative height difference between adjacent PSC girders (1), the cross beam body (4) and bracket (3) can be configured to rotate up and down.

[0068] To this end, a pair of first joining plates (32) are provided spaced apart from each other and parallel, and a second joining plate (41) can be inserted between the pair of first joining plates (32) and coupled so as to be rotatable up and down.

[0069] The above cross beam body (4) has both ends rotatably joined to the bracket (3), so that no moment is generated at the ends, and accordingly, mainly axial force acts on the cross beam body (4), resulting in excellent structural stability.

[0070] It is preferable that the above-mentioned cross-section body (4) be formed from a steel pipe with a circular cross section that has no distinction between a strong axis and a weak axis.

[0072] As illustrated in FIGS. 8 and 9, a first hinge shaft hole (H1) is formed in either the first joining plate (32) or the second joining plate (41) to which a hinge pin (P1) is fastened, and a first guide hole (G1) is formed in an arc shape with the first hinge shaft hole (H1) as the center of rotation at a position spaced apart from the first hinge shaft hole (H1) to which a guide pin (P2) is fastened, and in the other joining plate, a second hinge shaft hole (H2) is formed at a position corresponding to the first hinge shaft hole (H1) to which the hinge pin (P1) is coupled, and a second guide hole (G2) is formed in a circular shape at a position corresponding to the first guide hole (G1) to which the guide pin (P2) is fastened.

[0073] The first joining plate (32) and the second joining plate (41) can be joined by a double pin so that vertical rotation is allowed at the joint between the cross beam body (4) and the bracket (3), while limiting excessive rotation.

[0074] Based on the embodiment of FIG. 8, a first hinge shaft hole (H1) in the shape of a circle and a first guide hole (G1) in the shape of an arc may be formed spaced apart in the first joining plate (32) of the bracket (3). Also, a second hinge shaft hole (H2) in the shape of a circle and a second guide hole (G2) in the shape of a circle may be formed in the second joining plate (41) of the cross beam body (4).

[0075] The first hinge shaft hole (H1) and the first guide hole (G1) can be formed at positions corresponding to each other with respect to the second hinge shaft hole (H2) and the second guide hole (G2), respectively.

[0076] A hinge pin (P1) that acts as a hinge serving as the center of rotation can be inserted and fastened into the first hinge shaft hole (H1) and the second hinge shaft hole (H2).

[0077] Accordingly, the second joining plate (41) can be joined so as to be rotatable up and down around the hinge pin (P1).

[0078] And a guide pin (P2) can be inserted into and connected to the first guide hole (G1) and the second guide hole (G2).

[0079] At this time, the first guide hole (G1) is formed in an arc shape centered on the first hinge shaft hole (H1), so that when the second joining plate (41) rotates, the guide pin (P2) is allowed to rotate up and down within the first guide hole (G1).

[0080] When the relative rotation angle of the second joining plate (41) reaches a certain angle, the guide pin (P2) may catch on one end of the first guide hole (G1) to restrict further rotation. To this end, it is preferable that the diameter of the circular second guide hole (G2) be formed to be equal to the width of the arc-shaped first guide hole (G1).

[0081] Although not shown in the drawing, contrary to the embodiment of FIG. 8, a first hinge shaft hole (H1) and a first guide hole (G1) may be formed in the second joining plate (41), and a second hinge shaft hole (H2) and a second guide hole (G2) may be formed in the first joining plate (32).

[0083] FIG. 10 is an exploded perspective view illustrating the main body of the cross beam.

[0084] As illustrated in FIG. 10, the cross beam body (4) may be composed of a pair of steel pipe supports (42) having a second joining plate (41) joined to the first joining plate (32) at the outer end, and a rotating sleeve (43) provided between the pair of steel pipe supports (42) and screw-coupled to the steel pipe supports (42).

[0085] Recently, as PSC girders have become longer, the number of steel strands installed in the girders has increased and the height of the girders has risen, resulting in greater stiffness in the axial direction. Consequently, the lateral stiffness has become relatively weak, increasing the likelihood of lateral bending.

[0086] Therefore, the above-mentioned transverse beam body (4) can be configured to be adjustable in length so as to compensate for lateral displacement caused by lateral bending during the installation of the PSC girder or tensioning of the steel cable.

[0087] To this end, the above-mentioned cross beam body (4) may be composed of a pair of steel pipe supports (42) and a rotating sleeve (43) connecting the inner ends of the pair of steel pipe supports (42).

[0088] A second joining plate (41) for joining to the first joining plate (32) of the bracket (3) may be provided at the outer end of the above steel pipe support (42).

[0089] A rotating sleeve (43) is provided between the pair of steel pipe supports (42), so that the rotating sleeve (43) can be screw-coupled to the steel pipe supports (42).

[0090] As shown in FIG. 10, the steel pipe support (42) may be configured in a pipe shape with an open inner end, and a rotating sleeve (43) may be inserted into the open inner end of the steel pipe support (42) and screw-coupled.

[0091] To this end, screw threads may be formed on the outer surface of the rotating sleeve (43), and female screw threads may be formed on the inner surface of the steel pipe support (42).

[0092] Although not shown in the drawing, the rotation sleeve (43) can be formed in the shape of a tube with an open end. Then, by forming screw threads on the outer surface of the steel pipe support (42) and forming female screw threads on the inner surface of the rotation sleeve (43), the inner end of the steel pipe support (42) can be inserted into the open end of the rotation slab and screw-coupled.

[0093] The length of the cross beam body (4) can be extended or shortened by rotating the above-mentioned rotating sleeve (43) in the forward or reverse direction.

[0094] A handle (431) for rotating the rotating sleeve (43) may be formed protruding from the center of the rotating sleeve (43).

[0095] In order for the length of the horizontal beam body (4) to be extended or shortened when the above-mentioned rotating sleeve (43) is rotated, the screw threads (or female screw threads) formed on the rotating sleeve (43) may be formed such that the screw thread directions of the left and right parts are opposite to each other.

[0096] In this way, the bracket (3) is rotatably connected to the PSC girder (1), the cross beam body (4) is rotatably connected to the bracket (3), and the length of the cross beam body (4) can be adjusted. This configuration allows the steel cross beam (2) itself to simultaneously correct the transverse curvature and skew of the PSC girder (1).

[0097] In addition, stable lateral support is possible without the need for separate materials, and repetitive alignment and correction are possible.

[0098] In addition, since torsional or shear stress is relieved by the rotating bracket (3) at the end of the cross beam body (4), mainly only axial force is transmitted to the cross beam body (4). Accordingly, there is almost no deformation of the cross beam body (4), so the rotating sleeve (43) can be rotated smoothly, and shear failure of the anchor bolt (13) or local damage to the surrounding concrete of the anchor bolt (13) can be prevented. Explanation of the symbols

[0100] 1: PSC girder 11: Webb 12: Reinforcement rib 13: Anchor bolt 14: Settlement plate 15: Anchor Plate 2: Steel transverse beam 3: bracket 31: Fixed plate 311: Slot 32: First joining plate 4: Horizontal beam main body 41: Second joining plate 42: Steel pipe support 43: Rotating sleeve 431: Handle G1: 1st guide hole G2: 2nd Guide Hole H1: First hinge shaft hole H2: Second hinge shaft hole N: Nut P1: Hinge pin P2: Guide pin

Claims

Claim 1 The invention relates to a steel cross beam (2) installed transversely between a pair of spaced-apart PSC girders (1), comprising: a bracket (3) rotatably connected to the mutually facing sides of the PSC girders (1) with the axis of the steel cross beam (2) as a rotation axis; and a cross beam body (4) provided between the facing brackets (3). It is composed of, wherein a plurality of anchor bolts (13) are provided to protrude from the side of the PSC girder (1), and the bracket (3) is composed of a fixing plate (31) having a plurality of arc-shaped slots (311) formed therein for fastening the anchor bolts (13), and a first joining plate (32) provided vertically on the front of the fixing plate (31) to which the end of the cross beam body (4) is joined, and a second joining plate (41) is provided at the end of the cross beam body (4) to be rotatably joined to the first joining plate (32), and a first hinge shaft hole (H1) to which a hinge pin (P1) is fastened is formed in either the first joining plate (32) or the second joining plate (41), and in an arc shape with the first hinge shaft hole (H1) as the center of rotation at a position spaced apart from the first hinge shaft hole (H1). A steel cross beam capable of correcting transverse bending and skew of a PSC girder, characterized in that a first guide hole (G1) is formed to which a guide pin (P2) is fastened, a second hinge shaft hole (H2) is formed in a position corresponding to the first hinge shaft hole (H1) in another joining plate to which the hinge pin (P1) is coupled, and a second guide hole (G2) is formed in a circular shape in a position corresponding to the first guide hole (G1) to which the guide pin (P2) is fastened, and the cross beam body (4) is composed of a pair of steel pipe supports (42) having a second joining plate (41) attached to the first joining plate (32) at an outer end, and a rotating sleeve (43) provided between the pair of steel pipe supports (42) and screw-coupled to the steel pipe supports (42). Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete

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