The present disclosure relates to a camber adjustment device of a prefabricated truss bridge and a prefabricated truss bridge having the same, and more particularly, to a camber adjustment device of a prefabricated truss bridge capable of adjusting a camber to a desired level to compensate for deflection due to a load, and a prefabricated truss bridge having the same.

Generally, a truss structure is a frame structure in which joint points are connected by pins so that members do not bend, and an arch type, a suspension type, and a beam type are generally used. Such a truss structure is widely used as a building/civil engineering member that is lightweight and receives a large load.

Such a truss structure is typically used as a truss bridge. A prefabricated truss bridge, which is a type of such a truss bridge, is used as a truss bridge by continuously connecting truss panels, which are one unit, according to a length. More specifically, the truss panel is composed of an upper chord member and a lower chord member, and a plurality of vertical members and diagonal members for connecting the upper chord member and the lower chord member, and one end and the other end of the vertical member and the diagonal member are fixedly connected to the upper chord member and the lower chord member by welding, respectively. In addition, connection fittings are provided at both ends of the upper chord member and the lower chord member to connect the adjacent upper chord member and lower chord member through pins.

However, the existing prefabricated truss bridge is assembled in a straight line as the lengths of the upper chord member and the lower chord member are provided to be the same, but there is a problem that deflection occurs due to self-weight and superimposed load. When such deflection occurs, the driver's field of view is directed toward the floor when entering the bridge, which causes anxiety, and the drivability of the vehicle also deteriorates. Accordingly, conventionally, a camber (camber) that causes an initial shape to soar upward was introduced to compensate for this during the manufacture of the prefabricated truss bridge, but in the existing prefabricated truss bridge, the camber is not considered at all and is being constructed.

An aspect of the present disclosure is to provide a camber adjustment device of a prefabricated truss bridge capable of introducing a camber to a prefabricated truss bridge as well as adjusting the camber according to a position to be installed and a length of the bridge, and a prefabricated truss bridge having the same.

According to an aspect of the present disclosure, there is provided a camber adjustment device of a prefabricated truss bridge formed by assembling truss panels composed of an upper chord member, a lower chord member, a vertical member, and a diagonal member in one direction, the camber adjustment device comprising: a connection member provided at both ends of the upper chord member and the lower chord member, respectively, to connect the upper chord member and the lower chord member with an adjacent upper chord member and lower chord member, wherein the connection member is provided to be length-adjustable from both ends of the upper chord member and the lower chord member, respectively, by a length adjusting means.

According to another aspect of the present disclosure, there is provided a prefabricated truss bridge comprising: a truss panel composed of an upper chord member, a lower chord member, a vertical member, and a diagonal member; a connection member provided at both ends of the upper chord member and the lower chord member, respectively, and provided to connect the upper chord member and the lower chord member with an adjacent upper chord member and lower chord member; and a fastening member for connecting and fixing the connection member and a connection member of an adjacent truss panel, wherein the connection member is provided to be length-adjustable from both ends of the upper chord member and the lower chord member, respectively, by a length adjusting means, and each truss panel is assembled such that a total length of the upper chord member including a length of the connection member is formed longer than a total length of the lower chord member including the length of the connection member so that a camber is formed.

The length adjusting means may include: a plurality of bolt holes formed at regular intervals along a length direction of the upper chord member and the lower chord member; the connection member provided with a plurality of through holes corresponding to the plurality of bolt holes and provided such that a part thereof is inserted inward from both ends of the upper chord member and the lower chord member; and a fixing bolt for adjusting an insertion length of the connection member to limit a movement of the connection member through the bolt hole and the through hole.

The connection member may include: a fastening part in which a fastening hole into which the fastening member is assembled is formed so as to be connected and fixed to a connection member provided in an adjacent upper chord member and lower chord member; and an insertion part extending from the fastening part and having the plurality of through holes formed therein.

In an embodiment of the present disclosure, the length adjusting means may include: a hydraulic cylinder inserted and fixed to both ends of the upper chord member and the lower chord member; and the connection member provided to be advanceable and retractable according to an operation of the hydraulic cylinder.

The connection member may include: a fastening part in which a fastening hole into which the fastening member is assembled is formed so as to be connected and fixed to a connection member provided in an adjacent upper chord member and lower chord member; and an insertion part extending from the fastening part and inserted and installed in the hydraulic cylinder to be slidable.

In another embodiment of the present disclosure, the length adjusting means may include: a coupling part inserted and fixed to both ends of the upper chord member and the lower chord member and having a coupling hole in which a female thread is formed therein; and the connection member screw-coupled to the female thread of the coupling hole and provided to be advanceable and retractable according to a rotation direction.

The connection member may include: a fastening part in which a fastening hole into which the fastening member is assembled is formed so as to be connected and fixed to a connection member provided in an adjacent upper chord member and lower chord member; and an insertion part extending from the fastening part and having a male thread screw-coupled to the female thread formed on an outer circumferential surface thereof.

In another embodiment of the present disclosure, the length adjusting means may include: an intermediate connection part inserted into both ends of the upper chord member and the lower chord member and having inner wedge-shaped concavo-convex portions formed on both inner side surfaces along a length direction; the connection member having outer wedge-shaped concavo-convex portions corresponding to the inner wedge-shaped concavo-convex portions and fixed at a predetermined position of the intermediate connection part; and a fixing bolt penetrating the upper chord member and the lower chord member and the intermediate connection part to limit a movement of the intermediate connection part.

The connection member may include: a fastening part in which a fastening hole into which the fastening member is assembled is formed so as to be connected and fixed to a connection member provided in an adjacent upper chord member and lower chord member; and an insertion part extending from the fastening part and having the outer wedge-shaped concavo-convex portion mating with the inner wedge-shaped concavo-convex portion formed on a surface facing the inner wedge-shaped concavo-convex portion.

The camber adjustment device of a prefabricated truss bridge and the prefabricated truss bridge having the same according to an embodiment of the present disclosure provide a connection member connecting the upper chord member and the lower chord member with an adjacent upper chord member and lower chord member, respectively, to be length-adjustable, thereby forming the length of the upper chord member to be longer than the length of the lower chord member, so that a camber in which the truss bridge is processed to soar upward can be formed. Accordingly, deflection due to self-weight and superimposed load can be compensated for, and anxiety of a driver due to deflection of an existing bridge can be resolved and drivability can be improved.

In addition, there is an effect that the camber required according to the length of the bridge can be adjusted by easily adjusting the length through the connection member.

• FIG. 1 is a view showing a truss panel provided with a camber adjustment device according to an embodiment of the present disclosure.
• FIG. 2 is a view showing a state of connecting truss panels provided with a camber adjustment device according to an embodiment of the present disclosure.
• FIG. 3 is a view showing a prefabricated truss bridge to which a camber is imparted by a camber adjustment device according to an embodiment of the present disclosure.
• FIG. 4 is a view showing a plan cross-sectional view and a front cross-sectional view for explaining a length adjusting means of a camber adjustment device according to an embodiment of the present disclosure.
• FIG. 5 is a view showing a plan cross-sectional view and a front cross-sectional view showing a state in which a length of a connection member is adjusted through the length adjusting means of FIG. 4.
• FIG. 6 is a view showing a plan cross-sectional view and a front cross-sectional view for explaining another embodiment of a length adjusting means provided in a camber adjustment device according to an embodiment of the present disclosure.
• FIG. 7 is a view showing a plan cross-sectional view and a front cross-sectional view showing a state in which a length of a connection member is adjusted through the length adjusting means of FIG. 6.
• FIG. 8 is a view showing a plan cross-sectional view and a front cross-sectional view for explaining another embodiment of a length adjusting means provided in a camber adjustment device according to an embodiment of the present disclosure.
• FIG. 9 is a view showing a plan cross-sectional view and a front cross-sectional view showing a state in which a length of a connection member is adjusted through the length adjusting means of FIG. 8.
• FIG. 10 is a view showing a plan cross-sectional view and a front cross-sectional view for explaining another embodiment of a length adjusting means provided in a camber adjustment device according to an embodiment of the present disclosure.
• FIG. 11 is a view showing a plan cross-sectional view and a front cross-sectional view showing a state in which a length of a connection member is adjusted through the length adjusting means of FIG. 10.
• FIG. 12 is a partially cutaway perspective view showing the length adjusting means provided in the camber adjustment device of FIG. 10.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The following embodiments are presented to sufficiently convey the spirit of the present disclosure to those skilled in the art to which the present disclosure pertains. The present disclosure is not limited to the embodiments presented herein and may be embodied in other forms. The drawings may omit the illustration of parts irrelevant to the description in order to clarify the present disclosure, and may exaggerate the sizes of components to facilitate understanding.

FIG. 1 is a view showing a truss panel provided with a camber adjustment device according to an embodiment of the present disclosure, FIG. 2 is a view showing a state of connecting truss panels provided with a camber adjustment device according to an embodiment of the present disclosure, and FIG. 3 is a view showing a prefabricated truss bridge to which a camber is imparted by a camber adjustment device according to an embodiment of the present disclosure.

Referring to FIGS. 1 to 3, the camber adjustment device of the prefabricated truss bridge 1 according to an aspect of the present disclosure may include a connection member 100 capable of adjusting a length by a length adjusting means. The connection member 100 is length-adjusted and performs a role of connecting an upper chord member 11 and a lower chord member 12 with an adjacent upper chord member 11 and lower chord member 12. Specifically, the connection member 100 may be provided at both ends of the upper chord member 11 and the lower chord member 12 of the truss panel 10, which is one unit, respectively. Accordingly, the assembled truss bridge 1 can be manufactured as it is continuously assembled with the adjacent truss panel 10 through the connection member 100.

Meanwhile, the truss panel 10 may be composed of the upper chord member 11, the lower chord member 12, a diagonal member 13, and a vertical member 14. The upper chord member 11 and the lower chord member 12 may have a predetermined length and may be provided to have the same length as each other. In addition, the upper chord member 11 and the lower chord member 12 may be provided to have a pipe shape in which hollow parts 11a and 12a are formed therein along a length direction. At this time, the hollow parts 11a and 12a may be formed only in a portion where the connection member 100 is inserted through the length adjusting means to be described later. The upper chord member 11 and the lower chord member 12 may be provided such that a cross-section has various shapes such as a circle, a square, and a polygon.

The upper chord member 11 and the lower chord member 12 are spaced apart from each other by a predetermined interval, and a plurality of diagonal members 13 and vertical members 14 for supporting a load may be fixedly connected between the upper chord member 11 and the lower chord member 12. That is, both ends of the diagonal member 13 and the vertical member 14 may be connected to and fixed to the upper chord member 11 and the lower chord member 12. The truss panel 10 including the upper chord member 11 and the lower chord member 12 connected by the vertical member 14 and the diagonal member 13 is configured as one unit, and the prefabricated truss bridge can be manufactured by connecting the truss panels 10 of each unit.

The connection members 100 may be provided at both ends of the upper chord member 11 and both ends of the lower chord member 12 of the truss panel 10, respectively, and each connection member 100 is provided so that a length thereof can be adjusted by the length adjusting means. For example, the length adjustment of the connection member 100 through the length adjusting means may be performed through a bolt fastening structure of a bolt hole, a sliding structure according to hydraulic operation, a screw coupling structure, or a wedge-type connection part.

A length adjusting means according to an embodiment of the present disclosure will be described with reference to FIGS. 4 and 5.

FIG. 4 is a view showing a plan cross-sectional view and a front cross-sectional view for explaining a length adjusting means of a camber adjustment device according to an embodiment of the present disclosure, and FIG. 5 is a view showing a plan cross-sectional view and a front cross-sectional view showing a state in which a length of a connection member is adjusted through the length adjusting means of FIG. 4.

Referring to FIGS. 4 and 5, the length adjusting means of the camber adjustment device according to the present embodiment may include a bolt hole 110 formed in the upper chord member 11 and the lower chord member 12, a through hole 102a formed in the connection member 100, and a fixing bolt 120 inserted and fixed into the bolt hole 110 and the through hole 102a.

The bolt holes 110 may be formed at regular intervals along the length direction of the upper chord member 11 and the lower chord member 12. For example, a plurality of bolt holes 110 are formed in a direction toward the center with respect to both ends of the upper chord member 11 and the lower chord member 12. Here, the bolt hole 110 may be formed to penetrate from the front to the rear direction of the upper chord member 11 and the lower chord member 12, but is not limited thereto, and may be formed in a vertical direction.

The connection member 100 may be provided such that a part thereof is inserted from both ends of the upper chord member 11 and the lower chord member 12. That is, the connection member 100 may be inserted through the hollow parts 11a and 12a of the upper chord member 11 and the lower chord member 12. The connection member 100 may include a fastening part 101 connected to an adjacent connection member 100, and an insertion part 102 inserted into the hollow parts 11a and 12a.

The fastening part 101 located at one end of the upper chord member 11 and the lower chord member 12 is connected to the fastening part 101 of the connection member 100 located at the other end of the adjacent upper chord member 11 and lower chord member 12. A fastening hole 101a into which a fastening member 103 is assembled is formed in the center of the fastening part 101. Accordingly, when adjacent fastening parts 101 overlap each other, the fastening holes 101a are provided to be located at the same position. In this state, as the fastening member 103 is inserted into the fastening hole 101a, the adjacent fastening parts 101 can be connected and fixed to each other. At this time, the fastening member 103 may be composed of a pin or a bolt and a nut inserted into and fixed to the fastening hole 101a.

The insertion part 102 is formed extending from the fastening part 101 and may be provided to be inserted into the hollow parts 11a and 12a of the upper chord member 11 and the lower chord member 12. A plurality of through holes 102a may be formed in the insertion part 102 to have an interval corresponding to the plurality of bolt holes 110.

The fixing bolt 120 is provided to limit the movement of the connection member 100 through the bolt hole 110 and the through hole 102a. That is, the fixing bolt 120 may be fastened to the bolt hole 110 and the through hole 102a in a state in which the insertion length of the connection member 100 is adjusted so that the bolt hole 110 and the through hole 102a coincide. Accordingly, the connection member 100 can be fixed by adjusting the length in the length direction of the upper chord member 11 and the lower chord member 12, and can be connected to the adjacent connection member 100. At this time, at least one fixing bolt 120 may be provided to be fastened to the bolt hole 110 and the through hole 102a.

Meanwhile, the fastening part 101 provided on one side of the upper chord member 11 and the lower chord member 12 is provided as a pair of fastening pieces spaced apart from each other, and the fastening part 101 provided on the other side is provided as a single fastening piece and is illustrated as being inserted between the pair of fastening pieces, but is not limited thereto, and the shape thereof may be variously modified. For example, in the case where the adjacent upper chord members 11 and lower chord members 12 are not twisted and the adjacent fastening parts 101 are fastened by the fastening member 103, the formation position of the fastening part 101 may be changed or may have any shape.

A length adjusting means according to another embodiment of the present disclosure will be described with reference to FIGS. 6 and 7.

FIG. 6 is a view showing a plan cross-sectional view and a front cross-sectional view for explaining another embodiment of a length adjusting means provided in a camber adjustment device according to an embodiment of the present disclosure, and FIG. 7 is a view showing a plan cross-sectional view and a front cross-sectional view showing a state in which a length of a connection member is adjusted through the length adjusting means of FIG. 6.

Referring to FIGS. 6 and 7, the length adjusting means of the camber adjustment device according to the present embodiment may include a hydraulic cylinder 210 inserted into and fixed to both ends of the upper chord member 11 and the lower chord member 12, and the connection member 100 provided to be advanceable and retractable according to an operation of the hydraulic cylinder 210.

The hydraulic cylinder 210 is provided in a form in which one side is open, and may be inserted into and fixed to both ends of the upper chord member 11 and the lower chord member 12, respectively. That is, the open portion may be installed to be exposed at both ends of the upper chord member 11 and the lower chord member 12. At this time, the hydraulic cylinder 210 may be fixed to the upper chord member 11 and the lower chord member 12 by welding or bolts. The hydraulic cylinder 210 may be provided as a typical hydraulic cylinder operated by receiving hydraulic pressure. Accordingly, the connection member 100 inserted through the open portion of the hydraulic cylinder 210 may be provided to be advanceable and retractable according to the operation of the hydraulic cylinder 210.

The connection member 100 may be provided such that a part thereof is inserted inward from the open one side of the hydraulic cylinder 210. The connection member 100 may include a fastening part 101 connected to an adjacent connection member 100, and an insertion part 102 inserted into the hydraulic cylinder 210.

Here, the fastening part 101 is provided with the same structure as the fastening part 101 of the previous embodiment. That is, it may be connected and fixed to the adjacent fastening part 101 through the fastening member 103. Accordingly, a detailed description of the fastening part 101 in the present embodiment will be omitted.

The insertion part 102 is inserted into the hydraulic cylinder 210 and may be provided to advance and retract according to the operation of the hydraulic cylinder 210. That is, when the adjacent fastening parts 101 are connected and fixed to each other through the fastening member 103 in a state in which the hydraulic cylinder 210 operates and the insertion part 102 is advanced to the adjacent connection member 100, the fastening parts 101 are maintained in a connected and fixed state.

A length adjusting means according to another embodiment of the present disclosure will be described with reference to FIGS. 8 and 9.

FIG. 8 is a view showing a plan cross-sectional view and a front cross-sectional view for explaining another embodiment of a length adjusting means provided in a camber adjustment device according to an embodiment of the present disclosure, and FIG. 9 is a view showing a plan cross-sectional view and a front cross-sectional view showing a state in which a length of a connection member is adjusted through the length adjusting means of FIG. 8.

Referring to FIGS. 8 and 9, the length adjusting means of the camber adjustment device according to the present embodiment may include a coupling part 310 inserted and fixed to both ends of the upper chord member 11 and the lower chord member 12, and the connection member 100 screw-coupled to the coupling part 310.

The coupling part 310 may be inserted and fixed to both ends of the upper chord member 11 and the lower chord member 12, respectively. At this time, the coupling part 310 may be fixed to the upper chord member 11 and the lower chord member 12 by welding or bolts. The coupling part 310 is provided with a coupling hole 311 in which a female thread 312 is formed therein. At this time, the female threads 312 of the coupling holes 311 provided on one side and the other side of the upper chord member 11 and the lower chord member 12 may be formed in opposite directions to each other.

The connection member 100 is screw-coupled to the female thread 312 of the coupling hole 311 and may be provided to be advanceable and retractable according to a rotation direction. The connection member 100 may include a fastening part 101 connected to an adjacent connection member 100, and an insertion part 102 inserted into the coupling hole 311.

Here, the fastening part 101 is provided with the same structure as the fastening part 101 of the previous embodiment. That is, it may be connected and fixed to the adjacent fastening part 101 through the fastening member 103. Accordingly, a detailed description of the fastening part 101 in the present embodiment will be omitted.

The insertion part 102 is formed extending from the fastening part 101, and a male thread 102b may be formed on an outer circumferential surface thereof. Accordingly, the insertion part 102 is screw-coupled to the female thread 312 and inserted into the coupling part 310. That is, the connection member 100 advances and retracts from the coupling part 310 according to the rotation direction of the connection member 100.

On the other hand, as the female threads 312 formed in the coupling holes 311 of the coupling parts 310 facing each other are formed in opposite directions, the connection members 100 screw-coupled to the respective coupling holes 311 perform the same movement when rotated in directions opposite to each other. For example, when the connection member 100 located on one side of the upper chord member 11 and the lower chord member 12 is rotated in a clockwise direction, it moves in an outward direction, and when the connection member 100 located on the other side of the upper chord member 11 and the lower chord member 12 is rotated in a counterclockwise direction, it moves in an outward direction. Accordingly, it may be provided to adjust the length by rotating the connected connection member 100 after connecting and fixing the mutually adjacent connection members 100.

A length adjusting means according to another embodiment of the present disclosure will be described with reference to FIGS. 10 to 12.

FIG. 10 is a view showing a plan cross-sectional view and a front cross-sectional view for explaining another embodiment of a length adjusting means provided in a camber adjustment device according to an embodiment of the present disclosure, FIG. 11 is a view showing a plan cross-sectional view and a front cross-sectional view showing a state in which a length of a connection member is adjusted through the length adjusting means of FIG. 10, and FIG. 12 is a partially cutaway perspective view showing the length adjusting means provided in the camber adjustment device of FIG. 10.

Referring to FIGS. 10 to 12, the length adjusting means of the camber adjustment device according to the present embodiment may include an intermediate connection part 410 inserted into both ends of the upper chord member 11 and the lower chord member 12, the connection member 100 inserted and fixed to the intermediate connection part 410, and a fixing bolt 420 for limiting a movement of the intermediate connection part 410.

The intermediate connection part 410 may be inserted into both ends of the upper chord member 11 and the lower chord member 12, respectively. In the intermediate connection part 410, inner wedge-shaped concavo-convex portions 412 may be formed on both inner side surfaces along a length direction. That is, the inner wedge-shaped concavo-convex portions 412 may be formed to face each other.

The connection member 100 is provided with outer wedge-shaped concavo-convex portions 102c corresponding to the inner wedge-shaped concavo-convex portions 412 so that it can be selectively fixed at a predetermined position of the intermediate connection part 410. The connection member 100 may include a fastening part 101 connected to an adjacent connection member 100, and an insertion part 102 inserted into the intermediate connection part 410.

Here, the fastening part 101 is provided with the same structure as the fastening part 101 of the previous embodiment. That is, it may be connected and fixed to the adjacent fastening part 101 through the fastening member 103. Accordingly, a detailed description of the fastening part 101 in the present embodiment will be omitted.

The insertion part 102 extends from the fastening part 101, and an outer wedge-shaped concavo-convex portion 102c may be formed on an outer surface thereof. That is, on the outer surface of the insertion part 102, the outer wedge-shaped concavo-convex portion 102c mating with the inner wedge-shaped concavo-convex portion 412 may be formed to face the inner wedge-shaped concavo-convex portion 412. Accordingly, it may be configured such that the movement is fixed through the intermediate connection part 410 in a state in which the length is adjusted by advancing and retracting the connection member 100 in the direction of the adjacent connection member 100, and after the length is adjusted, the intermediate connection part 410 is fixed by the fixing bolt 420.

The fixing bolt 420 may be provided to penetrate the upper chord member 11 and the lower chord member 12 and the intermediate connection part 410 to limit the movement of the intermediate connection part 410. Although not shown, bolt holes for inserting and fixing the fixing bolt 420 may be formed in the intermediate connection part 410 and the upper chord member 11 and the lower chord member 12. In addition, the bolt holes (not shown) may be formed at regular intervals along the length direction of the intermediate connection part 410, and accordingly, bolt holes may be formed in the upper chord member 11 and the lower chord member 12 at intervals corresponding to the bolt holes.

Through the length adjusting means according to various embodiments as described above, the length of the connection member 100 can be adjusted. That is, by adjusting the lengths of the connection members 100 provided at both ends of the upper chord member 11 and the lower chord member 12, respectively, to connect and fix the adjacent truss panels 10, the prefabricated truss bridge 1 to which the camber is imparted can be manufactured. In order to impart such a camber, the length of the connection member 100 must be adjusted so that the total length of the upper chord member 11 including the length of the connection member 100 (refer to 'L1' in FIG. 1) is formed longer (L1 > L2) than the total length of the lower chord member 12 including the length of the connection member 100 (refer to 'L2' in FIG. 1). When assembling adjacent truss panels 10 through the connection member 100 length-adjusted as described above, the prefabricated truss bridge 1 to which the camber is imparted as shown in FIG. 3 can be manufactured.

Meanwhile, as the length of the connection member 100 is adjusted, the length of the connection member 100 can be selectively adjusted according to the entire length of the bridge, so that the imparted camber can be easily adjusted.

As described above, although the present disclosure has been described by limited embodiments and drawings, the present disclosure is not limited thereto, and it is a matter of course that various modifications and variations can be made by those skilled in the art to which the present disclosure pertains within the technical spirit of the present disclosure and the equivalent scope of the claims described below.