A stress structure device for connecting a middle part of a large cantilever double-width super-wide bridge into a whole

Abstract

The utility model discloses a stress structure device of big cantilever double width ultra wide bridge middle connection becomes whole, it is arranged between two bridges, and every bridge includes box girder and the bridge deck of box girder top, and the inside of every box girder has web, and the bottom of bridge deck has a plurality of stiffening half beam, and every stiffening half beam extends horizontally, and the stiffening half beam on two bridge decks is opposite each other and is connected through post-cast strip and forms a plurality of stiffening main girder, and every stiffening main girder extends horizontally, and a plurality of stiffening main girders are arranged along the length direction of bridge, and through the setting of a plurality of steel truss, and cooperate every steel truss with two webs and corresponding stiffening main girder fixed connection, and every steel truss can participate in bridge deck collaborative stress, and reduce the stress of bridge deck in the middle, can increase the length of bridge deck connection in the middle, and, through the setting of maintenance access, facilitate subsequent structure detection and maintenance, bring the convenience for use, can be widely used.

Description

Technical Field

[0001] This utility model relates to bridge technology, and in particular to a load-bearing structural device for connecting a large cantilever double-span ultra-wide bridge into a whole. Background Technology

[0002] Currently, long-span, ultra-wide highway bridges are typically designed as separated double-span bridges, utilizing the central median strip, with a 0.5–1.0m gap between the two spans. For urban bridges, due to land use constraints on both sides or aesthetic requirements, they often need to be designed as single-span bridges. Common design schemes include:

[0003] (1) An expansion joint is set between the two bridges, and only the asphalt on the bridge deck is continuous. This scheme allows the bridge deck pavement to crack at the expansion joint.

[0004] (2) Using the 50cm space in the middle of the crash barrier, an expansion joint is set in the middle to divide the crash barrier into two parts to separate the two bridges. This scheme cannot ensure the crash barrier's crash protection capability.

[0005] (3) The two bridges are connected as a whole by reserving a middle post-cast strip in the bridge deck so that the two bridges share the load. This scheme is usually used in small and medium span bridges. There are cases of its use in widening large span bridges, but it is rarely used in newly built bridges. Especially for large span cantilever box girders, during the process of the two bridges sharing the load, there is increased tension at the lower edge of the middle bridge deck of the box girder, which poses a risk of cracking. In addition, there is no maintenance passage in the middle of the bridge, making subsequent inspection and maintenance difficult.

[0006] (4) An expansion joint is set between the two main beams of the bridge. A UHPC bridge deck pavement is set in the middle of this location. This scheme is usually used in the construction or widening of small and medium span bridges. It is rarely used in large span bridges. Summary of the Invention

[0007] In view of this, the present invention addresses the deficiencies of the existing technology and its main objective is to provide a load-bearing structural device for connecting a large cantilever double-span ultra-wide bridge into a whole in the middle, which can effectively solve the problem that existing large-span bridges are prone to cracking of the bridge deck and are difficult to inspect and maintain in the future.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A load-bearing structural device for connecting two cantilevered, ultra-wide bridges in the middle is provided. This device is positioned between two bridge spans, each span comprising a box girder and a bridge deck at the top of the box girder. Each box girder has a web on its inner side, with two webs facing each other. The two bridge decks are connected by a post-cast strip. The bottom of each bridge deck has multiple stiffening half-beams, each extending laterally. These stiffening half-beams are spaced apart along the length of the bridge. The stiffening half-beams on the two bridge decks face each other and are connected by a post-cast strip to form multiple stiffening main beams, each extending laterally and spaced apart along the length of the bridge. The load-bearing structural device includes multiple steel trusses, each extending laterally and spaced apart along the length of the bridge. Each steel truss is fixedly connected to two webs and the corresponding stiffening main beam.

[0010] Preferably, a first reinforcing bar and a first steel plate are pre-embedded on the web, and the first steel plate is fixedly connected to the first reinforcing bar. A second reinforcing bar and a second steel plate are pre-embedded on the stiffening main beam, and the second steel plate is fixedly connected to the second reinforcing bar. The steel truss is welded and fixed to the first steel plate and the second steel plate.

[0011] Preferably, the steel truss includes a lower chord and multiple web members. The lower chord extends laterally, and its two ends are respectively welded to the corresponding first steel plate. The multiple web members are arranged in two parallel and intersecting rows. The lower end of each web member is welded and fixed to the lower chord, and the upper end of each web member is welded and fixed to the corresponding second steel plate.

[0012] Preferably, the lower chord is composed of H-beams, double-layered I-beams, or square steel tubes.

[0013] Preferably, the web member is an I-beam, a rectangular steel pipe, or a round pipe.

[0014] Preferably, the load-bearing structure device further includes two maintenance channels, which are respectively located on the lower edge of the two webs, and both maintenance channels are fixedly connected to the lower chord.

[0015] Preferably, the maintenance passage includes a longitudinal beam, a transverse beam, a steel plate, and a railing. The longitudinal beam is fixed to the lower chord, the transverse beam is horizontally arranged and welded to the longitudinal beam, the steel plate is horizontally stacked and fixed on the longitudinal and transverse beams, and the railing is vertically fixed to the outer edge of the steel plate.

[0016] Preferably, the distance between two adjacent stiffening main beams is 3-5m.

[0017] Preferably, the width of the post-cast strip is 1m.

[0018] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution:

[0019] By setting up multiple steel trusses and coordinating the fixed connection between each steel truss and the two webs and the corresponding stiffening main beam, each steel truss can participate in the joint stress of the bridge deck, reducing the stress on the bridge deck in the middle, increasing the length of the bridge deck connection in the middle, and by setting up inspection channels, it is convenient for subsequent structural inspection and maintenance, bringing convenience to use and making it widely applicable. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the steel truss support position in a preferred embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of the maintenance passage location in a preferred embodiment of this utility model;

[0022] Figure 3 This is a side view of a preferred embodiment of the present invention.

[0023] Explanation of reference numerals in the attached diagram:

[0024] 10. Bridges 11. Box girders

[0025] 111. Web plate; 12. Bridge deck plate

[0026] 121. Stiffened half beam; 13. Post-cast strip

[0027] 100. Stiffened main beam; 101. First reinforcing bar.

[0028] 102. First steel plate; 103. Second reinforcing bar

[0029] 104. Second steel plate; 105. Third reinforcing bar

[0030] 106. Third steel plate; 20. Steel truss

[0031] 21. Lower chord 22. Web member

[0032] 30. Maintenance access passage; 31. Longitudinal beam of maintenance access passage.

[0033] 32. Inspection passage crossbeam; 33. Inspection passage steel plate

[0034] 34. Railing Detailed Implementation

[0035] Please refer to Figures 1 to 3 As shown, it illustrates the specific structure of a preferred embodiment of the present invention, which is located between two bridges 10 and includes multiple steel trusses 20 and two maintenance access channels 30.

[0036] The two bridges 10 are arranged side by side in the transverse direction. Each bridge 10 includes a box girder 11 and a bridge deck 12 on top of the box girder 11. Each box girder 11 has a web 111 on its inner side. The two webs 111 face each other. The two bridge decks 12 are connected by a post-cast strip 13. The bottom of the bridge deck 12 has a plurality of stiffening half beams 121. Each stiffening half beam 121 extends laterally. The plurality of stiffening half beams 121 are arranged at intervals along the length of the bridge 10. The stiffening half beams 121 on the two bridge decks 12 face each other and are connected by the post-cast strip 13 to form a plurality of stiffening main beams 100. Each stiffening main beam 100 extends laterally. The plurality of stiffening main beams 100 are arranged at intervals along the length of the bridge 10. In this embodiment, a first reinforcing bar 101 and a first steel plate 102 are pre-embedded on the web 111, and the first steel plate 102 is fixedly connected to the first reinforcing bar 101. A second reinforcing bar 103 and a second steel plate 104 are pre-embedded on the stiffening main beam 100, and the second steel plate 104 is fixedly connected to the second reinforcing bar 103. A third reinforcing bar 105 and a third steel plate 106 are pre-embedded at the chamfer of the stiffening main beam 100. The width of the post-cast strip 13 is 1m. The distance between two adjacent stiffening main beams 100 is 3-5m.

[0037] Each steel truss 20 extends laterally, and multiple steel trusses 20 are arranged at intervals along the length of the bridge 10. Each steel truss 20 is fixedly connected to two web plates 111 and the corresponding stiffening main beam 100. In this embodiment, the steel truss 20 is welded and fixed to the first steel plate 102 and the second steel plate 104. Specifically, the steel truss 20 includes a lower chord 21 and multiple web members 22. The lower chord 21 extends laterally, and its two ends are welded to the corresponding first steel plate 102. The multiple web members 22 are arranged in two parallel and intersecting rows. The lower end of each web member 22 is welded and fixed to the lower chord 21, and the upper end of each web member 22 is welded and fixed to the corresponding second steel plate 104 and third steel plate 106 to form a whole, which can effectively reduce the mid-span stress at the root of the bridge deck 12. Furthermore, the lower chord 21 is composed of H-beams, double-layered I-beams, or square steel tubes. The web member 22 can be an I-beam, a rectangular steel pipe, or a round pipe.

[0038] The two maintenance access channels 30 are respectively located on the lower edges of the two webs 111, solving the problem that the sides of the webs 111 and the lower edge of the bridge deck 12 of the two bridge spans 10 cannot be inspected. Both maintenance access channels 30 are fixedly connected to the lower chord 21, which can be done by welding or by bolting. Specifically, the maintenance access channel 30 includes a longitudinal beam 31, a transverse beam 32, a steel plate 33, and a railing 34. The longitudinal beam 31 is fixed to the lower chord 21, which can be done by welding or by bolting. The transverse beam 32 is horizontally arranged and welded to the longitudinal beam 31. The steel plate 33 is horizontally stacked and fixed on the longitudinal beam 31 and the transverse beam 32. The railing 34 is vertically fixed to the outer edge of the steel plate 33.

[0039] During construction, the first steel bar 101, the first steel plate 102, the second steel bar 103, the second steel plate 104, the third steel bar 105, and the third steel plate 106 are pre-embedded at the corresponding positions on the bridge 10. Then, the two ends of the lower chord 21 are welded to the corresponding first steel plate 102, and the inspection passage 30 is connected to the lower chord 21 to form a whole, serving as a working platform for welding the web members 22 in the next stage. After the entire bridge is closed, the post-cast strip 13 between the two bridges 10 is constructed. After the post-cast strip 13 reaches its strength, each web member 22 is welded to the corresponding second steel plate 104 and the lower chord 21 to form a whole.

[0040] The key design features of this invention are: by setting up multiple steel trusses, and by fixing each steel truss to the two webs and the corresponding stiffening main beam, each steel truss can participate in the joint stress distribution of the bridge deck, reducing the stress on the bridge deck in the middle, increasing the length of the bridge deck connection in the middle, and by setting up an inspection channel, facilitating subsequent structural inspection and maintenance, bringing convenience to use, and making it widely applicable.

[0041] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A load-bearing structural device for connecting two spans of a large cantilevered, ultra-wide bridge into a whole, wherein the device is disposed between two spans of the bridge, each span of the bridge including a box girder and a bridge deck on top of the box girder, each box girder having a web on its inner side, the two webs facing each other, and the two bridge decks being connected by a post-cast strip, characterized in that: The bridge deck has multiple stiffening half-beams at its bottom, each extending laterally. These stiffening half-beams are spaced apart along the length of the bridge. The stiffening half-beams on two bridge decks are opposite each other and connected by post-cast strips to form multiple stiffening main beams. Each stiffening main beam extends laterally, and these stiffening main beams are spaced apart along the length of the bridge. The load-bearing structural device includes multiple steel trusses, each extending laterally. These steel trusses are spaced apart along the length of the bridge, and each steel truss is fixedly connected to two webs and the corresponding stiffening main beam.

2. The load-bearing structural device for connecting a large cantilevered double-span ultra-wide bridge into a whole as described in claim 1, characterized in that: The web is pre-embedded with a first reinforcing bar and a first steel plate, and the first steel plate is fixedly connected to the first reinforcing bar. The stiffening main beam is pre-embedded with a second reinforcing bar and a second steel plate, and the second steel plate is fixedly connected to the second reinforcing bar. The steel truss is welded and fixed to the first steel plate and the second steel plate.

3. The device for connecting the middle part of a large cantilever double-width and super-wide bridge into an integral stress structure according to claim 2, characterized in that: The steel truss includes a lower chord and multiple web members. The lower chord extends laterally, and its two ends are welded to the corresponding first steel plate. The multiple web members are arranged in two parallel and intersecting rows. The lower end of each web member is welded and fixed to the lower chord, and the upper end of each web member is welded and fixed to the corresponding second steel plate.

4. The device for connecting the middle part of a large cantilever double-width and super-wide bridge into an integral stress structure according to claim 3, characterized in that: The lower chord is composed of H-beams, double-layered I-beams, or square steel tubes.

5. The device of claim 3, wherein the device is characterized by: The web members are I-beams, rectangular steel pipes, or round pipes.

6. The device for connecting the middle part of a large cantilever double-width and super-wide bridge into an integral stress structure according to claim 3, characterized in that: The load-bearing structural device also includes two maintenance channels, which are respectively located on the lower edge of the two webs, and both maintenance channels are fixedly connected to the lower chord.

7. The load-bearing structure device for connecting a large cantilevered double-span ultra-wide bridge into a whole as described in claim 6, characterized in that: The maintenance passage includes a longitudinal beam, a transverse beam, a steel plate, and a railing. The longitudinal beam is fixed to the lower chord. The transverse beam is horizontally arranged and welded to the longitudinal beam. The steel plate is horizontally stacked and fixed on the longitudinal and transverse beams. The railing is vertically fixed to the outer edge of the steel plate.

8. The load-bearing structure device for connecting a large cantilever double-span ultra-wide bridge into a whole as described in claim 1, characterized in that: The distance between two adjacent stiffening main girders is 3-5m.

9. The load-bearing structural device for connecting a large cantilevered double-span ultra-wide bridge into a whole as described in claim 1, characterized in that: The width of the post-cast strip is 1m.

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