Double-layer steel truss and arch shell cooperative system bridge and erection method

Abstract

The present invention discloses a double-layer steel truss and arch shell cooperative system bridge and its erection method. The bridge body includes an upper deck, a lower deck, a steel truss and a steel arch shell. The lower end of the steel arch shell is open. The two ends of the opening of the shell are respectively connected to the front and rear side edges of the upper deck at the side span, and the two ends of the opening of the shell are respectively connected to the front and rear side edges of the lower deck at the mid-span. The upper deck and the steel truss are wrapped in the shell at the mid-span. In the present invention, the upper deck is for motor vehicles to pass through, and the lower deck is for slow-moving systems to pass through. Motor vehicles are separated from the slow-moving system, which not only ensures the safety of the slow-moving system, but also reduces the design elevation of the slow-moving system, making it easier for pedestrians and non-motor vehicles to pass through. The steel truss and the steel arch shell form a cooperative system to jointly bear the second phase dead load and the operational loads such as cars, people, and wind. The landscape arch shell structure is combined with the steel truss. While improving the landscape of the bridge, the steel arch shell participates in the overall stress of the bridge, improving the safety and economy of the overall structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge engineering, and in particular relates to a double-layer steel truss and arch shell cooperative system bridge and an erection method. Background Art

[0002] For urban bridges that cross rivers or ground roads, the bridge deck height is generally high due to the need to consider the height of the bridge structure and meet the requirements for clear height for navigation or vehicle passage under the bridge. A longer approach bridge or bridgehead is required to meet the passage requirements of the slow-moving system. This leads to the problem of high climbing height of the slow-moving system and inconvenient passage. Double-deck steel truss bridges can use the lower deck to pass the slow-moving system and directly connect with the connecting road, making it easier for pedestrians and non-motor vehicles to cross the river quickly and conveniently. In recent years, decorative structures have been added to the main structure of the bridge to enhance the landscape effect of urban bridges. However, the decorative structures do not participate in the stress of the bridge structure, but increase the design load of the original bridge and reduce the safety of the structure. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a double-layer steel truss and arch shell cooperative system bridge and an erection method to address the deficiencies in the prior art.

[0004] In order to achieve the above object, the purpose of the present invention is achieved through the following technical solutions:

[0005] In one aspect, a double-layer steel truss girder and arch shell cooperative system bridge is provided, comprising a bridge body, wherein the bridge body comprises:

[0006] The upper bridge deck is arranged with motor vehicle lanes;

[0007] The lower bridge deck is equipped with pedestrian and non-motorized vehicle lanes;

[0008] a steel truss girder arranged between the upper bridge deck and the lower bridge deck; and

[0009] The steel arch shell is located at the top of the bridge body and includes a shell. The lower end of the shell is open. The two ends of the opening of the shell are respectively connected to the front and rear side edges of the upper bridge deck at the side span, and the two ends of the opening of the shell are respectively connected to the front and rear side edges of the lower bridge deck at the mid-span. The upper bridge deck and the steel truss are wrapped in the shell at the mid-span.

[0010] As for the double-layer steel truss and arch shell cooperative system bridge, the steel truss includes a front steel truss and a rear steel truss, and the front steel truss and the rear steel truss are both multi-span continuous structures formed by connecting the ends of "V"-shaped trusses in sequence.

[0011] For example, in the double-layer steel truss and arch shell cooperative system bridge, the upper end of the front steel truss is slightly tilted forward and the upper end of the rear steel truss is slightly tilted backward at the same angle.

[0012] As in the double-layer steel truss and arch shell cooperative system bridge, the "V"-shaped truss includes an upper chord, a lower chord and a diagonal web, and the diagonal web is connected to the upper bridge deck through the upper chord and to the lower bridge deck through the lower chord, or the "V"-shaped truss includes an upper chord, a lower chord and an end web, and the end web is connected to the upper bridge deck through the upper chord and to the lower bridge deck through the lower chord.

[0013] As in the double-layer steel truss and arch shell cooperative system bridge, the upper bridge deck is laterally arranged with a wind-resistant support between the middle span and the shell, and the wind-resistant support is fixed to the upper bridge deck and leaves a gap with the shell.

[0014] As for the bridge with a double-layer steel truss and arch shell cooperative system, the longitudinal cross-section of the shell is eggshell-shaped.

[0015] For example, in the double-layer steel truss and arch shell cooperative system bridge, longitudinal side beams are arranged at the connection position between the shell and the lower bridge deck.

[0016] In another aspect, a method for erecting a double-layer steel truss girder and arch shell coordinated system bridge is provided, which is used to erect a double-layer steel truss girder and arch shell coordinated system bridge as described in any one of the above items, comprising:

[0017] a. Complete the construction of pile foundation, cap and pier;

[0018] b. Set up temporary supports for steel trusses;

[0019] c. Assemble the steel trusses on the temporary steel truss supports and remove the temporary steel truss supports after the steel trusses are joined;

[0020] d. Set up temporary support for the first steel arch shell and assemble the lower steel arch shell;

[0021] e. Set up a second temporary steel arch shell support on the upper bridge deck, assemble the upper steel arch shell on the second temporary steel arch shell support, and after the steel arch shells are connected, remove the first and second temporary steel arch shell supports;

[0022] f. Pour the upper bridge deck concrete deck from the mid-span to the pier support. The construction process ends after the construction of the entire bridge's auxiliary structures is completed.

[0023] The beneficial effects of the technical solution of the present invention are:

[0024] The upper bridge deck is used for motor vehicles, and the lower bridge deck is used for the slow-moving system, separating motor vehicles from the slow-moving system. This not only ensures the safety of the slow-moving system, but also reduces the design elevation of the slow-moving system, making it easier for pedestrians and non-motor vehicles to pass through. The steel trusses and steel arch shells form a collaborative system to jointly bear the second-phase dead load and operational loads such as cars, people, and wind. The landscape arch shell structure is combined with the steel trusses. While improving the landscape of the bridge, the steel arch shell participates in the overall stress of the bridge, improving the overall structural safety and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] To further illustrate the above-mentioned objectives, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the elevation structure of a preferred embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the cross-section structure in a preferred embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the connection structure between the steel arch shell and the lower bridge deck in a preferred embodiment of the present invention;

[0029] Figure 4a 、 Figure 4b 、 Figure 4c 、 Figure 4d 、 Figure 4e Schematic diagrams of steps a, b, c, d, and e of the bridge erection method according to a preferred embodiment of the present invention;

[0030] In the figure: 1. Upper bridge deck; 2. Lower bridge deck; 3. Steel truss; 31. Front steel truss; 32. Rear steel truss; 33. Upper chord; 34. Lower chord; 35. Diagonal web; 36. End web; 4. Steel arch shell; 41. Shell; 42. Longitudinal side beam; 43. Arc chamfer; 44. Lower steel arch shell; 5. Wind-resistant bearing; 6. Temporary support for steel truss; 7. Temporary support for the first steel arch shell; 8. Temporary support for the second steel arch shell. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0032] See Figure 1 、 Figure 2As shown, the double-deck steel truss and arch shell bridge of the present invention includes a bridge body comprising an upper deck 1, a lower deck 2, steel trusses 3, and a steel arch shell 4. The overall structure exhibits the load-bearing characteristics of a multi-span continuous beam. The upper deck 1 can be slightly wider than the lower deck 2. The upper deck 1 houses the motor vehicle lane and can utilize an orthotropic composite deck. The longitudinal stiffening ribs utilize U-shaped stiffeners and plate ribs, and a low-shrinkage hybrid fiber cast-in-place concrete deck is provided. The lower deck 2 houses the pedestrian and non-motor vehicle lanes and utilizes an orthotropic steel deck with a plate-truss combination. The steel truss 3 is arranged between the upper and lower decks 1 and 2. The steel arch shell 4 is located at the top of the bridge body and includes a shell 41. The lower end of the shell 41 is open. The two ends of the opening of the shell 41 are respectively connected to the front and rear edges of the upper bridge deck 1 at the side span, and the two ends of the opening of the shell 41 are respectively connected to the front and rear edges of the lower bridge deck 2 at the mid-span. The upper bridge deck 1 and the steel truss 3 are wrapped in the shell 41 at the mid-span.

[0033] The steel truss 3 comprises a front steel truss 31 and a rear steel truss 32. Both are multi-span continuous structures formed by connecting V-shaped trusses end-to-end. The trusses of the steel truss 3 are of uniform height, with the main truss consisting of two trusses. The truss joints are integral, and the segments are welded.

[0034] The upper end of the front steel truss 31 is slightly tilted forward, and the upper end of the rear steel truss 32 is slightly tilted backward at the same angle, with the angle range being less than 20°. Figure 2 From the cross-sectional view, it can be understood that the upper and lower ends of the front steel truss 31 and the upper and lower ends of the rear steel truss 32 are located at approximately one-third of the upper bridge deck 1 and the lower bridge deck 2, respectively. By slightly tilting, the longitudinal cross-sections of the front and rear steel trusses are made to present a "V" shape, providing optimal support force.

[0035] Furthermore, the "V"-shaped truss (single-piece truss) includes an upper chord 33, a lower chord 34 and a diagonal web 35, all of which are box-type sections, and the diagonal web 35 is connected to the upper bridge deck 1 through the upper chord 33 and to the lower bridge deck 2 through the lower chord 34, or, the "V"-shaped truss includes an upper chord 33, a lower chord 34 and an end web 36, all of which are box-type sections, and the end web 36 is connected to the upper bridge deck 1 through the upper chord 33 and to the lower bridge deck 2 through the lower chord 34.

[0036] See Figure 2 As shown, wind supports 5 are arranged transversely between the mid-span of the upper deck 1 and the shell 41. Wind supports 5 are fixed to the upper deck 1 with a gap between them and the shell 41. Under normal operating conditions, the shell 41 and wind supports 5 do not contact each other. However, under extreme wind loads, the installation of wind supports 5 can effectively limit the transverse displacement of the shell 41.

[0037] Furthermore, the longitudinal cross-section of the shell 41 is egg-shell-shaped, and the streamlined outer surface reduces wind resistance.

[0038] See Figure 3 As shown, a longitudinal side beam 42 is arranged at the connection position between the shell 41 and the lower bridge deck 2. The cantilever of the middle span lower bridge deck 2 is connected to the steel arch shell 4 and is subjected to greater force. The longitudinal side beam 42 adopts a box section.

[0039] The steel arch shell 4 is a complex spatial multi-arch structure, which adopts a steel box structure. The top side plates, web plates and inner side plates are all provided with plate-type stiffening ribs. Furthermore, the exposed arc chamfers 43 of the steel arch shell 4 are covered with steel plates.

[0040] The main steps in bridge construction are as follows:

[0041] a. Figure 4a As shown, the construction of pile foundation, cap and pier is completed;

[0042] b. Figure 4b As shown, a temporary support 6 for steel trusses is set up;

[0043] c. Figure 4c As shown, the steel truss beam 3 is assembled on the steel truss beam temporary support 6, and the steel truss beam temporary support 6 is removed after the steel truss beam 3 is connected;

[0044] d. Figure 4d As shown, a temporary support 7 for the first steel arch shell is set up, and the lower steel arch shell 44 is assembled;

[0045] e. Figure 4e As shown, a second steel arch shell temporary support 8 is set up on the upper bridge deck 1, and the upper steel arch shell is assembled on the second steel arch shell temporary support 8. After the steel arch shell 4 is closed, the first steel arch shell temporary support 7 and the second steel arch shell temporary support 8 are removed;

[0046] f. Pour the upper bridge deck concrete deck from the mid-span to the pier support. The construction process ends after the construction of the entire bridge's auxiliary structures is completed.

[0047] The present invention has an upper bridge deck for motor vehicles and a lower bridge deck for the slow-moving system, which separates motor vehicles from the slow-moving system, ensuring the safety of the slow-moving system and lowering the design elevation of the slow-moving system, making it easier for pedestrians and non-motor vehicles to pass through. The steel trusses and steel arch shells form a collaborative system to jointly bear the second-phase dead load and operational loads such as cars, people, and wind. The landscape arch shell structure is combined with the steel trusses. While improving the landscape of the bridge, the steel arch shell participates in the overall stress of the bridge, thereby improving the safety and economy of the overall structure.

[0048] The above are only preferred embodiments of the present invention and do not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-layer steel truss and arch shell cooperative system bridge, characterized in that: The bridge body comprises: The upper bridge deck is arranged with motor vehicle lanes; The lower bridge deck is equipped with pedestrian and non-motorized vehicle lanes; a steel truss girder arranged between the upper bridge deck and the lower bridge deck; and a steel arch shell, located at the top of the bridge body, comprising a shell, the lower end of which is open, the two ends of the opening of the shell respectively connected to the front and rear edges of the upper bridge deck at the side span, and the two ends of the opening of the shell respectively connected to the front and rear edges of the lower bridge deck at the mid-span, and the upper bridge deck and the steel truss are enclosed in the shell at the mid-span; The steel truss comprises a front steel truss and a rear steel truss, and both the front steel truss and the rear steel truss are multi-span continuous structures formed by sequentially connecting the ends of a V-shaped truss; The upper end of the front steel truss is tilted forward, and the upper end of the rear steel truss is tilted backward slightly at the same angle; The "V"-shaped girder includes an upper chord, a lower chord and a diagonal web, and the diagonal web is connected to the upper bridge deck through the upper chord and to the lower bridge deck through the lower chord. Alternatively, the "V"-shaped girder includes an upper chord, a lower chord and an end web, and the end web is connected to the upper bridge deck through the upper chord and to the lower bridge deck through the lower chord.

2. The double-layer steel truss and arch shell cooperative system bridge according to claim 1, characterized in that: The upper bridge deck is laterally provided with a wind-resistant support between the middle span and the shell. The wind-resistant support is fixed to the upper bridge deck and a gap is left between the upper bridge deck and the shell.

3. The double-layer steel truss and arch shell cooperative system bridge according to claim 1, characterized in that: The longitudinal cross-section of the shell is in the shape of an egg shell.

4. The double-layer steel truss and arch shell cooperative system bridge according to claim 1, characterized in that: A longitudinal side beam is arranged at the connection position between the shell and the lower bridge deck.

5. A method for erecting a double-layer steel truss girder and arch shell cooperative system bridge, used for erecting a double-layer steel truss girder and arch shell cooperative system bridge as claimed in any one of claims 1 to 4, characterized in that: include: a. Complete the construction of pile foundation, cap and pier; b. Set up temporary supports for steel trusses; c. Assemble the steel trusses on the temporary steel truss supports and remove the temporary steel truss supports after the steel trusses are joined; d. Set up temporary support for the first steel arch shell and assemble the lower steel arch shell; e. Set up a second temporary steel arch shell support on the upper bridge deck, assemble the upper steel arch shell on the second temporary steel arch shell support, and after the steel arch shells are connected, remove the first and second temporary steel arch shell supports; f. Pour the upper bridge deck concrete deck from the mid-span to the pier support. The construction process ends after the construction of the entire bridge's auxiliary structures is completed.

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