A bridge deck structure of a steel truss bridge

Abstract

The present invention discloses a bridge deck structure of a steel truss bridge, comprising a bridge deck structure body and a truss structure for supporting the bridge deck structure body; the truss structure comprises parallel lower chords of the main bridge and a crossbeam connected between the lower chords of the main bridge at a preset spacing; the bridge deck structure body comprises a steel bridge deck layer, an epoxy mortar casting layer and floor tiles laid on the epoxy mortar casting layer arranged in sequence from bottom to top, the steel bridge deck layer is overlapped and fixed to the crossbeam; the steel bridge deck layer comprises a bridge deck body and a first stiffening plate welded vertically to the bridge deck body, and expansion joints are reserved between adjacent steel bridge deck layers overlapped on the same crossbeam. The bridge deck structure of the steel truss bridge provided by the present invention has a prolonged service life, while reducing the construction difficulty and solving the problem of construction inconvenience.

Description

Technical Field

[0001] The invention relates to the technical field of engineering bridge design, and in particular to a bridge deck structure of a steel truss bridge. Background Art

[0002] At present, the deck structure and pavement of steel truss bridges are an important issue facing the world. The forms adopted by the United States, Japan, Germany, etc. are also different. For the bridges built at this stage, there are common problems such as fatigue damage, poor bridge deck stiffness and poor durability. Crack damage also occurs frequently. At this stage, the commonly used bridge deck paving materials mainly include epoxy asphalt mixture, cast asphalt concrete, and modified asphalt SMA. The bridge deck structure of steel truss bridges mainly includes three structural forms: steel bridge deck plus bridge deck pavement, reinforced concrete or prestressed concrete plus bridge deck pavement, and steel-concrete composite bridge deck plus bridge deck pavement.

[0003] Steel bridge deck plus bridge deck pavement has low overall stiffness, the bridge deck is easy to deform, and is prone to premature fatigue and overall or partial buckling. Reinforced concrete or prestressed concrete plus bridge deck pavement has high overall stiffness, but because concrete or prestressed concrete is stressed, the bridge deck structure is thicker and the bridge deck weight is larger. At the same time, since pedestrian overpasses are mainly on urban roads, when pouring concrete, formwork needs to be set up, and when setting up brackets, the road surface needs to be occupied, affecting traffic, and the construction period is long, so it is not suitable for pedestrian overpasses on urban roads.

[0004] There are many schemes of steel-concrete composite bridge deck plus bridge deck pavement, but the steel plate stiffeners of the composite bridge deck need to be welded to the chord of the truss. Due to the long length of the main beam, the bridge deck structure is affected by the shrinkage and creep of concrete, which affects the stress of the steel plate. Over time, the concrete is prone to cracking. And due to the span of the bridge, in a large-span bridge, temperature changes will also affect the bridge deck structure, causing damage.

[0005] Therefore, how to optimize the bridge deck structure, extend its service life and solve the inconvenience of construction have become technical problems that technicians in this field need to solve. Summary of the invention

[0006] The object of the present invention is to provide a bridge deck structure of a steel truss bridge, which extends the service life of the bridge deck and solves the problem of inconvenience in construction.

[0007] To achieve the above-mentioned object, the present invention provides a bridge deck structure of a steel truss bridge, comprising a bridge deck structure body and a truss structure for supporting the bridge deck structure body; the truss structure comprises parallel lower chords of the main bridge and cross beams connected between the lower chords of the main bridge at a preset spacing;

[0008] The bridge deck structure body comprises a steel bridge deck layer, an epoxy mortar casting layer and floor tiles laid on the epoxy mortar casting layer in sequence from bottom to top, and the steel bridge deck layer is overlapped and fixed to the crossbeam;

[0009] The steel bridge deck layer comprises a bridge deck body and a first stiffening plate welded perpendicular to the bridge deck body, and expansion joints are reserved between adjacent steel bridge deck layers overlapped on the same crossbeam.

[0010] Optionally, the expansion joint is filled with a first asphalt caulking paste layer.

[0011] Optionally, the first stiffening plate is arranged to be of the same length as the bridge deck body, and two ends of the bridge deck body are provided with bent edges covering the first stiffening plate.

[0012] Optionally, the crossbeam is an I-beam, and second stiffening plates are provided in notches on both sides of the I-beam, and the second stiffening plates are arranged perpendicular to the length direction of the crossbeam.

[0013] Optionally, the steel bridge deck layer is connected to the cross beam via anchor bolts, and the bolt holes provided in the steel bridge deck layer and / or provided in the cross beam and cooperating with the anchor bolts are oblong holes.

[0014] Optionally, a second asphalt caulking paste layer is laid above the beam and between the steel bridge deck layer.

[0015] Optionally, a steel mesh layer is welded above the steel bridge deck layer.

[0016] Optionally, the thickness of the epoxy mortar casting layer is 38 mm to 65 mm.

[0017] Optionally, the slope of the bridge deck structure body from both sides to the center in the width direction is ≤1%.

[0018] Optionally, the cross beam is fully welded to the lower chord of the main bridge.

[0019] Compared with the above-mentioned background technology, the bridge deck structure of the steel truss bridge provided by the present invention includes a bridge deck structure body and a truss structure used to support the bridge deck structure body. Among them, the bridge deck structure body includes a steel bridge deck layer, and the rigidity of the steel bridge deck layer is improved by means of the bridge deck body and the first stiffening plate vertically welded to the bridge deck body; the steel bridge deck layer is used to carry the epoxy mortar casting layer and reduce the setting of the formwork. The epoxy mortar casting layer cast in conjunction with the casting reduces the shrinkage creep of the bridge deck, improves the structural strength and early strength, has a short maintenance period, shortens the construction period, and can be used for pedestrians to walk after the floor tiles are laid.

[0020] The truss structure includes parallel lower chords of the main bridge and crossbeams connected between the lower chords of the main bridge at a preset interval. The bridge deck structure body is overlapped and fixed above adjacent crossbeams, and expansion joints are reserved between two adjacent bridge deck body structures overlapped on the same crossbeam along the length direction of the lower chord of the main bridge. The expansion joints can be used to release deformation caused by temperature changes and shrinkage creep, and reduce the impact of temperature stress on the bridge deck structure.

[0021] Furthermore, the above-mentioned steel bridge deck layer can be prefabricated by forming the bridge deck body and processed on the ground with the first stiffening plate, and can be hoisted into place during the bridge deck structure construction without setting up supporting formwork under the truss structure, thereby reducing the construction difficulty and the impact on ground traffic. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 A schematic diagram of a bridge deck structure of a steel truss bridge provided in an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of welding between the lower chord and the lower cross beam of the middle main bridge;

[0025] Figure 3 for Figure 1 A partial enlarged view of

[0026] Figure 4 It is a schematic diagram of the steel bridge deck layer;

[0027] Figure 5 for Figure 4 BB section diagram;

[0028] Figure 6 for Figure 4 Cross-sectional view of CC;

[0029] Figure 7 for Figure 4 Side view of the middle bridge deck body;

[0030] Figure 8 for Figure 5 Enlarged view of part D in .

[0031] in:

[0032] 1-lower chord of main bridge, 2-cross beam, 21-second stiffening plate, 3-steel bridge deck layer, 31-bridge deck body, 32-first stiffening plate, 33-bending edging, 4-first asphalt caulking paste layer, 5-anchor bolts, 6-second asphalt caulking paste layer, 7-steel mesh layer, 8-epoxy mortar pouring layer, 9-floor tiles. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] Please refer to Figures 1 to 8 , Figure 1 A schematic diagram of a bridge deck structure of a steel truss bridge provided in an embodiment of the present invention, Figure 2 for Figure 1 Schematic diagram of welding between the lower chord and the lower cross beam of the middle main bridge. Figure 3 for Figure 1 A partial enlarged view of Figure 4 This is a schematic diagram of the steel bridge deck layer. Figure 5 for Figure 4 BB cross-section diagram, Figure 6 for Figure 4 The cross-sectional view of CC, Figure 7 for Figure 4 Side view of the middle bridge deck body, Figure 8 for Figure 5 Enlarged view of part D in .

[0036] The bridge deck structure of the steel truss bridge provided by the present invention includes a bridge deck structure body and a truss structure for supporting the bridge deck structure body. The bridge deck structure body includes a steel bridge deck layer 3, an epoxy mortar casting layer 8 and floor tiles 9 laid on the epoxy mortar casting layer 8. The rigidity of the steel bridge deck layer 3 is improved by means of the bridge deck body 31 and the first stiffening plate 32; a plurality of bridge deck bodies 31 are welded in parallel, and the first stiffening plate 32 is welded perpendicular to the plane of the bridge deck body 31 and welded at the joints of adjacent bridge deck bodies 31. The steel bridge deck layer 3 and the epoxy mortar layer cast in combination reduce the shrinkage creep of the bridge deck, improve the structural strength and early strength, have a short maintenance period, shorten the construction period, and can be used for pedestrians to walk after the floor tiles 9 are laid.

[0037] The truss structure includes a main bridge lower chord 1 arranged in parallel and a crossbeam 2 connected between the main bridge lower chords 1 at a preset spacing. The bridge deck structure body is overlapped and fixed above the adjacent crossbeams 2, and expansion joints are reserved between two adjacent bridge deck body structures overlapped on the same crossbeam 2 along the length direction of the main bridge lower chord 1, which can be used to release deformation caused by temperature changes and shrinkage creep, and reduce the impact of temperature stress on the bridge deck structure. The assembly of the above-mentioned steel bridge deck layer 3 can be prefabricated on the ground and then hoisted into place during the bridge construction process. With the help of the steel bridge deck layer 3 to carry the epoxy mortar casting layer 8, there is no need to set up a supporting formwork under the truss structure, which reduces the construction difficulty and the impact on ground traffic.

[0038] The bridge deck structure of the steel truss bridge provided by the present invention is introduced in more detail below with reference to the accompanying drawings and specific embodiments.

[0039] Please refer to Figures 1 to 3 In the specific embodiment provided by the present invention, the bridge deck structure body adopts a steel bridge deck layer 3, an epoxy mortar casting layer 8 and floor tiles 9 laid on the epoxy mortar casting layer 8, which are arranged in sequence from bottom to top. The truss structure includes a pair of main bridge lower chords 1 and a plurality of groups of beams 2 connected between the pair of main bridge lower chords 1. The steel bridge deck layer 3 is overlapped and fixed between two adjacent beams 2. An expansion joint is reserved between two adjacent steel bridge deck layers 3, that is, the steel bridge deck layers 3 overlapped and fixed on the same beam 2. The width of the expansion joint is set to about 10 mm to release the deformation of the steel bridge deck layer 3 caused by temperature changes and shrinkage creep.

[0040] At the same time, the expansion joint is filled with asphalt caulking paste to form a first asphalt caulking paste layer 4. The first asphalt caulking paste layer 4 has a good filling effect on the expansion joint between adjacent steel bridge deck layers 3, and does not limit the expansion and contraction phenomenon caused by the temperature influence of the steel bridge deck layer 3. The width of the expansion joint can be flexibly adjusted according to the length of the steel bridge deck layer 3. The present invention is set to 10 mm when the thickness of the steel bridge deck layer 3 is about 86 mm, the length is 1500 mm, and the width is about 5800 mm.

[0041] In order to facilitate the temperature change and shrinkage of the steel bridge deck layer 3, the steel bridge deck layer 3 and the cross beam 2 are fixedly connected by anchor bolts 5, and at least one of the bolt holes opened in the steel bridge deck layer 3 and the cross beam 2 for cooperating with the anchor bolts 5 is an oblong hole or an elliptical hole, and the length direction of the oblong hole or the elliptical hole is perpendicular to the length direction of the cross beam 2. In other words, the length direction of the oblong hole coincides with the length direction of the steel bridge deck layer 3. When the length of the steel bridge deck layer 3 changes due to temperature and shrinkage creep, the anchor bolt 5 can move slightly along the length direction of the oblong hole, and the width of the expansion joint changes. The anchor bolt 5 uses a bolt of M10×110 specification.

[0042] Furthermore, a second asphalt caulking paste layer 6 is provided between the bonding surface of the steel bridge deck layer 3 and the cross beam 2, and the second asphalt caulking paste layer 6 can evenly load the gravity of the steel bridge deck layer 3 on the cross beam 2. At the same time, when the length of the steel bridge deck layer 3 changes, the second asphalt caulking paste layer 6 provides the possibility for the steel bridge deck layer 3 to move slightly relative to the cross beam 2. The thickness of the second asphalt caulking paste layer 6 is preferably set at 5mm. At this time, the bridge body is composed of a 250mm cross beam 2, a 5mm second asphalt caulking paste layer 6, an 86mm steel bridge deck layer 3, a 38-65mm thick epoxy mortar casting layer 8 and a 20mm thick floor tile 9 from bottom to top, and the floor tile 9 is usually an anti-slip floor tile 9.

[0043] In order to further optimize the above embodiment, a steel mesh is also provided between the epoxy mortar casting layer 8 and the steel bridge deck layer 3. A steel mesh with a thickness of 8 mm is flattened and welded on top of the steel bridge deck layer 3, and then the epoxy mortar is poured to form the epoxy mortar casting layer 8. The provision of the steel mesh layer 7 can improve the adhesion between the epoxy mortar casting layer 8 and the steel bridge deck layer 3. The thickness of the epoxy mortar casting layer 8 should be no less than 38 mm, and gradually thicken from both sides of the width direction of the bridge deck structure body to the middle, thereby forming a certain slope from both sides of the bridge deck structure body to the middle, and the slope is preferably set to be less than 1%.

[0044] In the above embodiment, the bridge deck structure body and truss structure of the present invention are, from bottom to top, 250mm steel cross beam 2, 5mm thick second asphalt caulking paste layer 6, 86mm steel bridge deck layer 3, 8mm steel mesh layer 7, 38-65mm thick epoxy mortar casting layer 8 and 20mm thick anti-slip floor tiles 9. The cross beam 2 and the lower chord of the main beam are welded by full penetration welding. The schematic diagram of welding can be referred to Figure 2 .

[0045] The cross beam 2 is made of 250×175×10×12 I-beam, and a 218×82.5×12 second stiffening plate 21 is provided in the notch on both sides of the I-beam every 900-1000 mm. The second stiffening plate 21 is arranged perpendicular to the length direction of the cross beam 2 and connected to the cross beam 2 with a 7 mm fillet weld. The second stiffening plate 21 is used to improve the rigidity of the cross beam 2.

[0046] Please refer to further Figures 4 to 8The steel bridge deck adopts a steel grille with a height of 86 mm. The steel grille includes a bridge deck body 31 welded in parallel and a first stiffening plate 32 welded vertically to the bridge deck body 31. The first stiffening plate 32 is perpendicular to the plane formed by the bridge deck body 31, which can effectively improve the rigidity of the steel bridge deck layer 3. The first stiffening plate 32 and the bridge deck body 31 are set to be of equal length, and the two ends of the bridge deck body 31 are provided with a bending edge 33 covering the first stiffening plate 32. The bending edge 33 is specifically an L-shaped edge set at the end of the bridge deck body 31, and cooperates with the bridge deck body 31 to form a covering groove at both ends of the bridge deck body 31 in the length direction, which is drooped relative to the bridge deck body 31 and used to install the first stiffening plate 32. The two sides of the first stiffening plate 32 are connected by a 6 mm fillet weld, and one weld is made every 150 mm. The first stiffening plate 32 is processed. The bridge deck body 31 and the first stiffening plate 32 form a steel grille with a thickness of 86 mm.

[0047] The length of the bridge deck is determined by the spacing between the two cross beams 2, which is about 1500 mm in the present invention, and the width is 5800 mm. To ensure the integrity of the bridge deck, it can be welded and assembled in the factory, and can be hoisted in blocks after being transported to the site.

[0048] The construction plan of the bridge deck structure of the present invention is to hoist and fix the lower chord 1 of the main bridge and the crossbeam 2 to form a truss structure supporting the main body of the bridge deck structure; lay a 5mm thick second asphalt caulking paste layer 6 on the crossbeam 2 → transport the steel bridge deck layer 3 welded in the factory to the site and install it → connect the steel bridge deck layer 3 and the crossbeam 2 with anchor bolts 5 → weld an 8mm steel mesh layer 7 on the bridge deck → cast to form an epoxy mortar casting layer 8 → after the epoxy mortar casting layer 8 reaches the design strength, lay a 20mm thick anti-slip floor tile 9 and fill the expansion joint with asphalt caulking paste to form a first asphalt caulking paste layer 4.

[0049] The steel bridge deck layer 3 can be prefabricated in the factory and assembled in sections. At the same time, the bridge deck body 31 below can be used as the bottom mold of the epoxy mortar casting layer 8, which reduces the installation and removal of the template, shortens the construction period, and does not affect the road traffic during the construction process.

[0050] Expansion joints are provided between each steel bridge deck layer 3 and filled with asphalt caulking paste, thereby reducing the length of each section of the bridge deck structure, thereby reducing the impact of stress caused by temperature changes on the bridge deck structure.

[0051] Epoxy mortar itself has waterproof properties and small shrinkage and creep. It has high strength, especially early strength, and a short maintenance period. It effectively reduces the construction period of the sidewalk surface and reduces the impact of shrinkage and creep on the bridge deck structure.

[0052] Pouring epoxy mortar on the steel bridge deck layer 3 can increase the overall rigidity of the bridge deck structure body and prevent the bridge deck body 31 from premature fatigue and overall or local buckling.

[0053] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0054] The above is a detailed introduction to the deck structure of the steel truss bridge provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A bridge deck structure of a steel truss bridge, characterized in that: It comprises a bridge deck structure body and a truss structure for supporting the bridge deck structure body; the truss structure comprises parallel lower chords (1) of the main bridge and cross beams (2) connected between the lower chords (1) of the main bridge at a preset interval; The bridge deck structure body comprises, from bottom to top, a steel bridge deck layer (3), an epoxy mortar casting layer (8), and floor tiles (9) laid on the epoxy mortar casting layer (8), wherein the steel bridge deck layer (3) is overlapped and fixed to the crossbeam (2); The steel bridge deck layer (3) comprises a bridge deck body (31) and a first stiffening plate (32) welded perpendicular to the bridge deck body (31), and expansion joints are reserved between adjacent steel bridge deck layers (3) overlapped on the same crossbeam (2).

2. The bridge deck structure of the steel truss bridge according to claim 1, characterized in that: The expansion joint is filled with a first asphalt caulking paste layer (4).

3. The bridge deck structure of the steel truss bridge according to claim 1, characterized in that: The first stiffening plate (32) is arranged to have the same length as the bridge deck body (31), and two ends of the bridge deck body (31) are provided with bent edges (33) covering the first stiffening plate (32).

4. The bridge deck structure of the steel truss bridge according to claim 3, characterized in that: The crossbeam (2) is an I-beam, and second stiffening plates (21) are provided in notches on both sides of the I-beam. The second stiffening plates (21) are arranged perpendicular to the length direction of the crossbeam (2).

5. The bridge deck structure of the steel truss bridge according to claim 4, characterized in that: The steel bridge deck layer (3) and the cross beam (2) are connected via anchor bolts (5), and the bolt holes provided in the steel bridge deck layer (3) and / or provided in the cross beam (2) and cooperating with the anchor bolts (5) are oblong holes.

6. The bridge deck structure of the steel truss bridge according to claim 5, characterized in that: A second asphalt caulking paste layer (6) is laid above the crossbeam (2) and between the steel bridge deck layer (3).

7. The bridge deck structure of a steel truss bridge according to any one of claims 1 to 6, characterized in that: A steel mesh layer (7) is welded above the steel bridge deck layer (3).

8. The bridge deck structure of the steel truss bridge according to claim 7, characterized in that: The thickness of the epoxy mortar casting layer (8) is 38 mm to 65 mm.

9. The bridge deck structure of the steel truss bridge according to claim 8, characterized in that: The slope of the bridge deck structure body from both sides to the center in the width direction is ≤1%.

10. The bridge deck structure of the steel truss bridge according to claim 9, characterized in that: The cross beam (2) and the lower chord (1) of the main bridge are fully welded.

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