Fully-assembled orthotropic steel bridge deck

Abstract

The utility model provides a full assembly type orthotropic steel bridge deck, which relates to the technical field of bridges, and comprises a top plate, a diaphragm plate and a longitudinal rib, the top plate is arranged at the top of the diaphragm plate along a vertical orthogonal direction, the diaphragm plate is provided with an installation channel, the longitudinal rib passes through the installation channel and is arranged below the top plate, and the longitudinal rib is arranged below the top plate. The longitudinal ribs and the transverse partition plates are arranged in a perpendicular and orthogonal mode. The upper ends of the longitudinal ribs are fixedly connected with the top plate through bolt assemblies, and the lower ends of the longitudinal ribs are fixedly connected with the transverse partition plate through bolt assemblies. The fully-assembled orthotropic steel bridge deck is simple in structure, effectively solves the problem of fatigue cracking at the weld joints of the orthotropic steel bridge deck top plate and the longitudinal ribs and the weld joints of the longitudinal ribs and the transverse partition plates, and improves the fatigue performance of the orthotropic steel bridge deck.

Description

Technical Field

[0001] The utility model relates to the technical field of bridges, and in particular to a fully assembled orthotropic steel bridge deck. Background Art

[0002] Since the 1950s, orthotropic steel bridge decks have been widely used in the construction of large-span steel bridges due to their advantages such as light weight, convenient construction, high load-bearing capacity, and wide application range. However, the structure of orthotropic steel bridge decks is complex, with a large number of welds, and initial defects are inevitable during welding. At the same time, there are large residual stresses in the welds and heat-affected zones. Geometric mutations and geometric discontinuities in structural details will produce large stress concentration effects. Under the repeated wheel loads of random traffic, the microscopic initial defects at the welds with large stress concentration effects on orthotropic steel bridge decks will gradually form macroscopic cracks visible to the naked eye. Over time, the cracks will continue to expand and even break. Such fatigue cracking problems will endanger the safety and durability of steel bridges.

[0003] Among all orthotropic steel bridge decks, the longitudinal rib-top plate weld is the most studied detail, because the number of longitudinal rib-top plate welds is far greater than other welds, and their total length may exceed 50 times the length of the bridge. The proportion of fatigue cracking in this part accounts for about 20% of the total cases. The fatigue cracks in this part appear at the top plate weld root or weld toe and extend to the top plate. The fatigue damage phenomenon in this part is not easy to be found. Generally, it will be found when the cracks extend to the pavement protection layer. It is difficult to repair and is extremely harmful.

[0004] Among the many fatigue failure details of orthotropic steel bridge decks, the longitudinal rib-diaphragm is the most geometrically complex detail in the orthotropic steel bridge deck, with high stress concentration and initial welding risk, and fatigue cracking problems occur more frequently. There are various forms of details here, such as whether there is an arc cut, whether there is an inner diaphragm, different weld types, different plate thicknesses, etc. For diaphragms with arc cuts, there are also many different shapes of arc cuts. There is no suitable connection form that can be applied to all orthotropic steel bridge decks. In a large number of engineering practices, it was found that there are two main fatigue failure modes here: one is cracking at the starting point of the arc cut of the longitudinal rib-diaphragm weld, and the other is cracking on the longitudinal rib web at the end of the longitudinal rib-diaphragm weld. Utility Model Content

[0005] In order to overcome at least one defect in the above-mentioned prior art, the utility model provides a fully assembled orthotropic steel bridge deck to solve the problem of fatigue cracking at the welds between the orthotropic steel bridge deck top plate and the longitudinal ribs and between the longitudinal ribs and the transverse diaphragms, thereby improving the fatigue performance of the orthotropic steel bridge deck.

[0006] The utility model provides a fully assembled orthogonal anisotropic steel bridge deck, comprising a top plate, a transverse diaphragm and longitudinal ribs, wherein the top plate is arranged on the top of the transverse diaphragm along a vertical orthogonal direction, an installation channel is opened on the transverse diaphragm, the longitudinal ribs pass through the installation channel and are arranged below the top plate, and the longitudinal ribs are arranged vertically and orthogonally to the transverse diaphragm; the upper end of the longitudinal rib is connected and fixed to the top plate by a bolt assembly, and the lower end of the longitudinal rib is connected and fixed to the transverse diaphragm by a bolt assembly.

[0007] Compared with the prior art, the fully assembled orthotropic steel bridge deck of the utility model has the following advantages:

[0008] The fully assembled orthotropic steel bridge deck provided by the utility model uses a bolted connection structure instead of welding with prominent fatigue problems, which completely solves the welding fatigue failure problem between the top plate and the longitudinal ribs, and between the longitudinal ribs and the transverse diaphragms from the source, and improves the fatigue performance of the steel bridge deck. At the same time, this fully assembled structure is more convenient for assembly and construction and later maintenance and disassembly, thereby reducing the cost of bridge construction and maintenance.

[0009] As an improvement, the longitudinal rib is an inverted trapezoidal structure with an upper opening formed by bending an integral steel plate. Angle steel connectors are respectively connected to the webs on both sides of the longitudinal rib. The first connecting plate of each angle steel connector is connected and fixed to the longitudinal rib by a bolt assembly, and the second connecting plate of the angle steel connector is connected and fixed to the transverse diaphragm by a bolt assembly. In the above improved structure, the two webs of the longitudinal rib are connected and fixed to the transverse diaphragm by a dedicated angle steel connector. From the perspective of assembly, the fit and integrity between the components can be improved, and the connection strength is higher.

[0010] In a further improvement, two groups of angle steel connectors are connected to the webs on both sides of the longitudinal ribs, and the second connecting plates of the two groups of angle steel connectors are symmetrically connected to the two sides of the transverse diaphragm in the thickness direction. In the above improved structure, angle steel connectors are arranged between the two webs of the longitudinal ribs on both sides of the transverse diaphragm in the thickness direction, and the connection structure is stable and has good shear resistance.

[0011] Further improved, the thickness of the second connecting plate is greater than 1.5 times the thickness of the first connecting plate. In the above improved structure, since there are angle steel connectors on both sides of the diaphragm, the angle steel on one side of the diaphragm does not need to be thickened, and the longitudinal rib is only attached with an angle steel connector on the outside. In order to enhance the strength and rigidity of the details at this location, the thickness of the angle steel plate on the longitudinal rib side is increased.

[0012] In a further improvement, both side plates of the open end of the longitudinal rib are bent outward to form a horizontal connecting plate, and the horizontal connecting plate is connected and fixed to the lower end of the top plate by a bolt assembly; the upper part of the installation channel is open, and the tops on both sides of the open end of the transverse partition are provided with sunken steps for accommodating the horizontal connecting plate. In the above improved structure, the horizontal connecting plate is convenient for connecting and fixing the longitudinal rib and the top plate after it is provided, and the horizontal connecting plate and the longitudinal rib are an integral structure with high structural strength, and are formed by bending, which is convenient for processing and low in cost; in addition, the sunken steps on the transverse partition make the longitudinal ribs more closely matched with the transverse partition after they are connected.

[0013] In a further improvement, the first connecting plate and the second connecting plate are respectively a horizontally arranged rectangular structure and a right-angled trapezoidal structure, and a plurality of the bolt assemblies are arranged in an array along the horizontal direction on the first connecting plate and the second connecting plate. In the above improved structure, the first connecting plate and the second connecting plate are both arranged horizontally, which facilitates the connection of the bolt assemblies, and the bolt assemblies are arranged in a horizontal array, which can better resist the wheel load, reduce the vibration between the angle steel and the diaphragm and the longitudinal ribs when the vehicle passes, improve the overall rigidity of the structure, and facilitate assembly construction.

[0014] In a further improvement, the bolt assembly includes a bolt, a locking nut and two washers, the two washers are respectively located on both sides of the thickness direction of the connection part and are sleeved on the bolt. In the above structure, the specific combination of the bolt assembly can improve the fastening degree between the longitudinal ribs, the transverse partition and the top plate, as well as the overall structural strength.

[0015] In a further improvement, the transverse diaphragm, the two webs of the longitudinal ribs and the top plate are all provided with bolt holes for bolts to pass through; wherein the upper end of each bolt hole on the top plate is provided with a coaxial countersunk hole, the countersunk hole is used to accommodate the bolt head of the bolt, and the depth of the countersunk hole is greater than or equal to the thickness of the bolt head. In the above improved structure, a countersunk hole is provided on the upper surface of the top plate to accommodate the bolt head of the bolt, so as to ensure the flatness of the upper surface of the top plate after connection, which is beneficial to the construction of the subsequent pavement layer.

[0016] Other improved features and advantages of the utility model will be described in the subsequent specific embodiments, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be achieved and obtained through the structures specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural diagram of the fully assembled orthotropic steel bridge deck of the utility model;

[0018] Figure 2 It is a front view of the fully assembled orthotropic steel bridge deck of the utility model;

[0019] Figure 3 It is a left view of the fully assembled orthotropic steel bridge deck of the utility model;

[0020] Figure 4 for Figure 2 The X in the figure is a magnified structural diagram;

[0021] Figure 5 It is a partial cross-sectional view of the connection structure between the top plate and the horizontal connection plate in the utility model;

[0022] Figure 6 This is a structural diagram of the longitudinal ribs in the utility model;

[0023] Figure 7 It is the front view of the diaphragm in the utility model.

[0024] Description of reference numerals:

[0025] 1. Top plate; 2. diaphragm; 3. Longitudinal rib; 4. Installation channel; 5. Angle steel connector; 6. First connecting plate; 7. Second connecting plate; 8. Horizontal connecting plate; 9. Sunken step; 10. Bolt; 11. Locking nut; 12. Washer; 13. Bolt hole; 14. Countersunk hole. DETAILED DESCRIPTION

[0026] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0027] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "fixed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0028] In the embodiments of the present application, unless otherwise clearly specified and limited, the first feature at the "upper end" or "lower end" of the second feature may be such that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium.

[0029] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] See also Figure 1 to Figure 7As shown, an embodiment of the present application discloses a fully assembled orthotropic steel bridge deck, including a top plate 1, a diaphragm 2 and a longitudinal rib 3, wherein the top plate 1 is arranged in the horizontal direction, and the diaphragm 2 is arranged in the vertical direction, wherein the top plate 1 is arranged on the top of the diaphragm 2 in a vertical orthogonal direction, and an installation channel 4 is opened on the diaphragm 2 along its thickness direction, and the longitudinal rib 3 passes through the installation channel 4 and is arranged below the top plate 1, and the longitudinal rib 3 is arranged vertically and orthogonally to the diaphragm 2; the upper end of the longitudinal rib 3 is connected and fixed to the top plate 1 by a bolt 10 assembly, and the lower end of the longitudinal rib 3 is connected and fixed to the diaphragm 2 by a bolt 10 assembly.

[0031] Specifically, in this embodiment, the longitudinal rib 3 is an inverted trapezoidal structure with an upper opening formed by bending the two ends of an integral steel plate. Angle steel connectors 5 are respectively connected to the webs on both sides of the longitudinal rib 3. The first connecting plate 6 of each angle steel connector 5 is connected and fixed to the longitudinal rib 3 by a bolt 10 assembly, and the second connecting plate 7 of the angle steel connector 5 is connected and fixed to the transverse diaphragm 2 by a bolt 10 assembly. The angle steel connector 5 here is specially designed. In order to make the longitudinal rib 3 and the angle steel connector 5 fit better, the angle steel connector 5 on one side of the transverse diaphragm 2 adopts a trapezoidal design, such as Figure 3 As shown; the angle steel connector 5 on one side of the longitudinal rib 3 adopts a rectangular design, and the angle steel connecting plates on both sides (the first connecting plate 6 and the second connecting plate 7) are respectively processed with four bolt holes 10, with an interval of 40 to 50 mm. In addition, the thickness of the first connecting plate 6 is 10 to 14 mm, and the thickness of the second connecting plate 7 is 16 to 20 mm. In this embodiment, since there are angle steel connectors 5 on both sides of the diaphragm 2, the first connecting plate 6 on one side of the diaphragm 2 does not need to be thickened, and 12 mm is sufficient. The longitudinal rib 3 is only attached with an angle steel connector 5 on the outside. In order to enhance the strength and rigidity of the details at this location, the thickness of the second connecting plate 7 on one side of the longitudinal rib 3 is increased to 20 mm.

[0032] In addition, in this embodiment, the thickness of the transverse partition 2 is 12 to 16 mm, the thickness of the top plate 1 is 12 to 16 mm, and the thickness of the inverted trapezoidal longitudinal ribs is 8 to 12 mm.

[0033] In order to further enhance the strength of the connection structure, two groups of angle steel connectors 5 are connected to the webs on both sides of the longitudinal rib 3 in the above structure, and the second connecting plates 7 of the two groups of angle steel connectors 5 are symmetrically connected to both sides of the transverse partition 2 in the thickness direction.

[0034] In order to complete the bolt 10 connection between the top plate and the inverted trapezoidal longitudinal ribs, the two side plates at the open end of the longitudinal ribs 3 are bent outward to form a horizontal connecting plate 8. In this embodiment, the horizontal connecting plate 8 extends outward by 50 to 80 mm, leaving enough space for processing the bolt 10 holes; the horizontal connecting plate 8 is connected and fixed to the lower end of the top plate 1 by the bolt 10 assembly, the upper part of the installation channel 4 is open, and the top of the transverse partition 2 on both sides of the open end is provided with a sunken step 9 for accommodating the horizontal connecting plate 8, so that the inverted trapezoidal longitudinal ribs and the transverse partition 2 can be better fitted and assembled. In addition, in order to avoid the lower end of the longitudinal rib 3 from interfering with the transverse partition 2, in this structure, the lower end of the installation channel 4 is expanded outward so that the lower end outer wall of the longitudinal rib 3 does not contact the transverse partition 2.

[0035] On the other hand, the first connecting plate 6 and the second connecting plate 7 are respectively a horizontally arranged rectangular structure and a right-angled trapezoidal structure, and a plurality of bolt 10 assemblies are arranged in an array along the horizontal direction on the first connecting plate 6 and the second connecting plate 7. Preferably, the bolt 10 assembly includes a bolt 10, a locking nut 11 and two washers 12, and the two washers 12 are respectively located on both sides of the thickness direction of the connecting portion and are sleeved on the bolt 10. Among them, the bolt 10 is a high-strength friction bolt 10, with a strength grade of more than 10.9 and a specification of M20 to M36, the washer 12 is a stainless steel washer 12, and the locking nut 11 is an outer hexagonal nut.

[0036] Bolt holes 10 for passing bolts 10 are provided on the transverse diaphragm 2, the two webs of the longitudinal ribs 3 and the top plate 1; wherein the upper end of each bolt hole 10 on the top plate 1 is provided with a coaxial countersunk hole, the countersunk hole is used to accommodate the bolt head 10 of the bolt 10, and the depth of the countersunk hole is greater than or equal to the thickness of the bolt head 10. Preferably, the depth of the countersunk hole is 6 to 8 mm.

[0037] In the implementation process of the present invention, in order to ensure the smooth progress of subsequent on-site assembly, the longitudinal rib 3 and the angle steel connector 5 should be assembled before the longitudinal rib 3 and the top plate 1 are welded; in the assembly process of the longitudinal rib 3 and the angle steel connector 5, the stainless steel washer 12 and the high-strength bolt 10 are first installed on the inner side of the longitudinal rib 3, and then the angle steel connector 5 is aligned, and finally the stainless steel washer 12 and the nut on one side of the angle steel connector 5 are installed. The final effect is as follows: Figure 5 shown.

[0038] During the on-site assembly process, first complete the bolt 10 connection between the longitudinal ribs of the angle steel connector 5 and the top plate 1; after the bolt connection is completed, the diaphragm 2 with the bolt 10 holes processed is embedded between the assembled left and right angle steel connectors 5, and after aligning the bolt 10 holes of the angle steel connector 5 and the diaphragm 2, the stainless steel washers 12 are installed on the outside of the left and right angle steel connectors 5, and finally the high-strength bolts 10 and nuts are installed. The final effect is as follows Figure 2shown in side view.

[0039] In summary, the fully assembled orthotropic steel bridge deck structure in this implementation has the following advantages:

[0040] 1. The fully assembled orthotropic steel bridge deck provided by the utility model uses a bolt 10 connection structure instead of welding with prominent fatigue problems, which completely solves the welding fatigue failure problem between the top plate 1 and the longitudinal rib 3, and between the longitudinal rib 3 and the transverse diaphragm 2 from the source, and improves the fatigue performance of the steel bridge deck. At the same time, this fully assembled structure is more convenient for assembly and construction and later maintenance and disassembly, thereby reducing the cost of bridge construction and maintenance.

[0041] 2. The orthotropic steel bridge deck longitudinal rib-diaphragm 2 connection structure provided by the utility model adopts a special angle steel connector 5 design, which can improve the fit and integrity between components from the perspective of assembly. The angle steel on the side connected to the longitudinal rib is thickened to improve the strength and rigidity of the details at this location and improve the fatigue performance of this location.

[0042] 3. The orthotropic steel bridge deck longitudinal rib-diaphragm 2 connection structure provided by the utility model adopts high-strength friction bolts 10, including high-strength bolts 10 with nuts, locking nuts 11, and stainless steel washers 12. The combination of this set of fasteners can improve the fastening degree between the longitudinal ribs, the diaphragm 2 and the connecting parts, as well as the overall structural strength and rigidity.

[0043] 4. The circular groove on the upper surface of the orthotropic steel bridge deck provided by the utility model reserves space for nuts, which is beneficial to the construction of subsequent paving layers.

[0044] 5. The connecting bolts 10 between the orthogonal anisotropic steel bridge deck diaphragm 2 and the angle steel provided by the utility model are arranged in parallel, which can better resist wheel loads, reduce vibration between the angle steel and the diaphragm 2 when vehicles pass, improve the overall rigidity of the structure, and facilitate assembly and construction.

[0045] In the description of the present application, the description with reference to the terms "present embodiment", "some embodiments", etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradicting each other.

[0046] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A fully assembled orthotropic steel bridge deck, comprising a top plate (1), a diaphragm (2) and longitudinal ribs (3), characterized in that: The top plate (1) is arranged on the top of the transverse partition (2) along a vertical orthogonal direction, and a mounting channel (4) is opened on the transverse partition (2). The longitudinal rib (3) passes through the mounting channel (4) and is arranged below the top plate (1), and the longitudinal rib (3) and the transverse partition (2) are arranged vertically orthogonal; the upper end of the longitudinal rib (3) is connected and fixed to the top plate (1) by a bolt (10) assembly, and the lower end of the longitudinal rib (3) is connected and fixed to the transverse partition (2) by a bolt (10) assembly.

2. The fully assembled orthotropic steel bridge deck according to claim 1, characterized in that: The longitudinal rib (3) is formed by bending an integral steel plate and has an upper opening and an inverted trapezoidal structure. Angle steel connectors (5) are respectively connected to the webs on both sides of the longitudinal rib (3). The first connecting plate (6) of each angle steel connector (5) is connected and fixed to the longitudinal rib (3) by a bolt (10) assembly, and the second connecting plate (7) of the angle steel connector (5) is connected and fixed to the transverse partition (2) by a bolt (10) assembly.

3. The fully assembled orthotropic steel bridge deck according to claim 2, characterized in that: Two groups of angle steel connectors (5) are connected to the webs on both sides of the longitudinal rib (3), and the second connecting plates (7) of the two groups of angle steel connectors (5) are symmetrically connected to the two sides of the transverse partition (2) in the thickness direction.

4. The fully assembled orthotropic steel bridge deck according to claim 3, characterized in that: The thickness of the first connecting plate is 10-14 mm, and the thickness of the second connecting plate (7) is 16-20 mm.

5. The fully assembled orthotropic steel bridge deck according to claim 3, characterized in that: The two side plates at the open end of the longitudinal rib (3) are bent outward to form a horizontal connecting plate (8), and the horizontal connecting plate (8) is connected and fixed to the lower end of the top plate (1) by a bolt (10) assembly; the upper part of the installation channel (4) is open, and the top of the two sides of the open end of the transverse partition (2) are provided with sunken steps (9) for accommodating the horizontal connecting plate (8).

6. The fully assembled orthotropic steel bridge deck according to claim 2, characterized in that: The first connecting plate (6) and the second connecting plate (7) are respectively a horizontally arranged rectangular structure and a right-angled trapezoidal structure, and a plurality of the bolt (10) assemblies are arranged in an array along a horizontal direction on the first connecting plate (6) and the second connecting plate (7).

7. The fully assembled orthotropic steel bridge deck according to any one of claims 1 to 6, characterized in that: The bolt (10) assembly comprises a bolt (10), a locking nut (11) and two washers (12); the two washers (12) are respectively located on both sides of the connecting portion in the thickness direction and are sleeved on the bolt (10).

8. The fully assembled orthotropic steel bridge deck according to claim 7, characterized in that: The transverse partition (2), the two webs of the longitudinal ribs (3) and the top plate (1) are all provided with bolt (10) holes for the bolts (10) to pass through; wherein the upper end of each bolt (10) hole on the top plate (1) is provided with a countersunk hole coaxial therewith, the countersunk hole is used to accommodate the bolt (10) head of the bolt (10), and the depth of the countersunk hole is greater than or equal to the thickness of the bolt (10) head.

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