CN111485492A - Bridge deck structure of steel truss bridge - Google Patents

Abstract

The invention discloses a bridge deck structure of a steel truss bridge, which comprises a bridge deck structure body and a truss structure used for supporting the bridge deck structure body; the truss structure comprises main bridge lower chords arranged in parallel and cross beams connected among the main bridge lower chords at preset intervals; the bridge deck structure body comprises a steel bridge deck plate layer, an epoxy mortar pouring layer and floor tiles laid above the epoxy mortar pouring layer, wherein the steel bridge deck plate layer is fixed on the cross beam in an overlapping mode; the steel bridge deck slab layer comprises a bridge deck slab body and a first stiffening plate welded to the bridge deck slab body, and expansion joints are reserved between the adjacent steel bridge deck slab layers which are lapped on the same cross beam. The bridge deck structure of the steel truss bridge provided by the invention has the advantages that the service life is prolonged, the construction difficulty is reduced, and the problem of inconvenient construction is solved.

Description

Bridge deck structure of steel truss bridge

Technical Field

The invention relates to the technical field of engineering bridge design, in particular to a bridge deck structure of a steel truss bridge.

Background

At present, the bridge deck structure and pavement of the steel truss bridge are an important problem facing the world. The forms adopted in the united states, japan, germany, etc. are also different. For the bridge built at the present stage, the problems of fatigue failure, poor rigidity of the bridge deck, poor durability and the like generally exist, the condition of crack failure also occurs frequently, and the commonly used bridge deck pavement materials at the present stage mainly have three forms of epoxy asphalt mixture, pouring asphalt concrete and modified asphalt SMA. The bridge deck structure of the steel truss bridge mainly adopts three structural forms of steel bridge deck slab plus bridge deck pavement, reinforced concrete or prestressed concrete plus bridge deck pavement and steel-concrete combined bridge deck slab plus bridge deck pavement.

The steel bridge deck and the bridge deck are paved, so that the overall rigidity is low, the bridge deck is easy to deform, and fatigue and overall or local buckling are easy to occur too early. The whole rigidity of the reinforced concrete or prestressed concrete plus bridge deck pavement is larger, but the bridge deck structure is thicker and the weight of the bridge deck is larger because the concrete or prestressed concrete is stressed. Meanwhile, the pedestrian overpass is mainly arranged on an urban road, when concrete is poured, a template needs to be erected, the road surface needs to be occupied when a support is arranged to influence traffic, and the construction period is long, so that the pedestrian overpass is not suitable for the urban road.

The scheme of steel-concrete composite bridge deck slab and bridge deck pavement is more in style, but steel plate stiffening ribs of the composite bridge deck slab need to be welded with chords of a truss, the length of a main beam is longer, so that the stress of a steel plate is influenced due to the effects of shrinkage and creep of concrete and the like of a bridge deck structure, and the concrete is easy to crack after a long time. And due to the bridge span, in a bridge with a large span, the change of temperature can also affect the bridge deck structure, so that the damage is generated.

Therefore, how to optimize the bridge deck structure, prolong the service life and solve the problem of inconvenient construction becomes a technical problem to be solved by the technical personnel in the field.

Disclosure of Invention

The invention aims to provide a bridge deck structure of a steel truss bridge, which prolongs the service life of the bridge deck and solves the problem of inconvenient construction.

In order to achieve the above purpose, 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 main bridge lower chords arranged in parallel and cross beams connected among the main bridge lower chords at preset intervals;

the bridge deck structure body comprises a steel bridge deck plate layer, an epoxy mortar pouring layer and floor tiles laid above the epoxy mortar pouring layer, wherein the steel bridge deck plate layer is fixed on the cross beam in an overlapping mode;

the steel bridge deck slab layer comprises a bridge deck slab body and a first stiffening plate welded to the bridge deck slab body, and expansion joints are reserved between the adjacent steel bridge deck slab layers which are lapped on the same cross beam.

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

Optionally, the first stiffening plate and the bridge deck body are arranged in equal length, and the two ends of the bridge deck body are provided with bent covering edges for covering the first stiffening plate.

Optionally, the cross beam is made of i-shaped steel, second stiffening plates are arranged in notches at two sides of the i-shaped steel, and the second stiffening plates are perpendicular to the length direction of the cross beam.

Optionally, the steel bridge deck layer is connected with the cross beam through an anchor bolt, and the bolt hole which is arranged on the steel bridge deck layer and/or on the cross beam and matched with the anchor bolt is a long round hole.

Optionally, a second layer of asphalt caulk is laid between the top of the cross beam and the layer of steel bridge deck.

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

Optionally, the thickness of the epoxy mortar pouring layer is 38-65 mm.

Optionally, the gradient of the bridge deck structure body from two sides to the center in the width direction is less than or equal to 1%.

Optionally, the cross beam is fusion welded with the main bridge lower chord.

In contrast to the above background art, 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 comprises a steel bridge deck slab layer, and the rigidity of the steel bridge deck slab layer is improved by means of the bridge deck slab body and a first stiffening plate vertically welded to the bridge deck slab body; the steel bridge deck layer is used for bearing the epoxy mortar pouring layer and reducing the arrangement of the templates. The epoxy mortar pouring layer which is poured in a matched mode reduces shrinkage and creep of the bridge floor, improves structural strength and early strength, is short in maintenance period, shortens the construction period, and can be used for pedestrians to walk after the floor tiles are paved.

The truss structure comprises parallel main bridge lower chords and cross beams connected between the main bridge lower chords according to preset intervals, bridge deck structure bodies are fixed above the adjacent cross beams in an overlapped mode, expansion joints are reserved between two adjacent bridge deck body structures of the same cross beam along the length direction of the main bridge lower chords in an overlapped mode, deformation caused by temperature change and shrinkage creep can be released, and the influence of temperature stress on the bridge deck structures is reduced.

Further, above-mentioned steel bridge deck slab layer can rely on with the prefabricated shaping of deck slab body and accomplish in ground processing with first stiffening plate, when carrying out the bridge deck structure construction hoist and mount in place can, need not to erect the supporting template in truss structure below, has reduced the construction degree of difficulty and has reduced the influence to ground traffic.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic view of a deck structure of a steel truss bridge according to an embodiment of the present invention;

FIG. 2 is a schematic view of the welding of the lower chord and the lower cross member of the main bridge of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 1;

FIG. 4 is a schematic illustration of a steel deck slab layer;

FIG. 5 is a sectional view taken along line B-B of FIG. 4;

FIG. 6 is a cross-sectional view of C-C of FIG. 4;

FIG. 7 is a side view of the body of the deck plate of FIG. 4;

fig. 8 is an enlarged view of a portion D in fig. 5.

Wherein:

the method comprises the following steps of 1-main bridge lower chord, 2-cross beam, 21-second stiffening plate, 3-steel bridge deck plate layer, 31-bridge deck plate body, 32-first stiffening plate, 33-bending edge covering, 4-first asphalt caulking paste layer, 5-anchoring bolt, 6-second asphalt caulking paste layer, 7-steel rib net layer, 8-epoxy mortar pouring layer and 9-floor tile.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 8, fig. 1 is a schematic view illustrating a deck structure of a steel truss bridge according to an embodiment of the present invention, fig. 2 is a schematic view illustrating welding between a lower chord and a lower cross member of the main bridge in fig. 1, fig. 3 is a partially enlarged view of fig. 1, fig. 4 is a schematic view illustrating a steel bridge deck, fig. 5 is a sectional view taken along line B-B in fig. 4, fig. 6 is a sectional view taken along line C-C in fig. 4, fig. 7 is a side view illustrating a bridge deck body in fig. 4, and fig. 8 is an enlarged view taken along line D in fig. 5.

The bridge deck structure of the steel truss bridge provided by the invention comprises a bridge deck structure body and a truss structure used for supporting the bridge deck structure body. The bridge deck structure body comprises a steel bridge deck slab layer 3, an epoxy mortar pouring layer 8 and floor tiles 9 paved on the epoxy mortar pouring layer 8. The rigidity of the steel bridge deck slab layer 3 is improved by means of the bridge deck slab body 31 and the first stiffening plates 32; the plurality of bridge deck bodies 31 are welded in parallel, and the first stiffening plates 32 are welded perpendicular to the plane of the bridge deck bodies 31 and welded at the abutted seams of the adjacent bridge deck bodies 31. The steel bridge deck slab layer 3 and the epoxy mortar layer poured in a matched mode reduce shrinkage and creep of the bridge deck, improve structural strength and early strength, shorten maintenance period, shorten construction period and enable pedestrians to walk after the floor tiles 9 are laid.

The truss structure includes parallel arrangement main bridge lower chord 1 and connects crossbeam 2 between main bridge lower chord 1 according to predetermined interval, and bridge floor structure body overlap joint is fixed in 2 tops of adjacent crossbeam, and reserves the expansion joint between two adjacent bridge floor body structures of same crossbeam 2 along the length direction overlap joint of main bridge lower chord 1, can be used for releasing because the deformation that temperature variation and shrink creep produced, reduces the influence that temperature stress produced bridge floor structure. The steel bridge deck slab layer 3 can be assembled by prefabricating and forming on the ground and then hoisting in place in the bridge construction process, the steel bridge deck slab layer 3 is used for bearing the epoxy mortar pouring layer 8, a supporting template does not need to be erected below the truss structure, and the construction difficulty and the influence on ground traffic are reduced.

The bridge deck structure of the steel truss bridge provided by the invention is described in more detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 3, in the embodiment of the present invention, the bridge deck structure body includes a steel bridge deck slab layer 3, an epoxy mortar casting layer 8 and a floor tile 9 laid on the epoxy mortar casting layer 8 in sequence from bottom to top. The truss structure comprises a pair of main bridge lower chords 1 and a plurality of groups of cross beams 2 connected between the pair of main bridge lower chords 1. The steel bridge deck plate layer 3 is fixed between two adjacent cross beams 2 in an overlapping mode. Two adjacent steel bridge deck layers 3 are also fixed between the steel bridge deck layers 3 of the same cross beam 2 in an overlapping mode, and an expansion joint is reserved between the two adjacent steel bridge deck layers 3, the width of the expansion joint is set to be about 10mm, and the expansion joint is used for releasing deformation of the steel bridge deck layers 3 caused by temperature change and shrinkage creep.

Meanwhile, 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 plays a good filling role in the expansion joint between the adjacent steel bridge deck layers 3, and simultaneously does not limit the expansion and contraction phenomenon caused by the temperature influence of the steel bridge deck layers 3. The width of the expansion joint can be flexibly adjusted according to the length of the steel bridge deck plate layer 3. The thickness of the steel bridge deck plate layer 3 is about 86mm, the length is 1500mm, and the width is about 5800mm, the thickness is set to be 10 mm.

In other words, the length direction of the long circular hole is overlapped with the length direction of the steel bridge deck layer 3, when the length of the steel bridge deck layer 3 is influenced by temperature and shrinkage creep, the anchor bolt 5 can move slightly along the length direction of the long circular hole, the width of the expansion joint changes, and the anchor bolt 5 is a bolt with the specification of M10 × 110.

Further, still be equipped with second pitch caulking paste layer 6 between steel bridge deck slab layer 3 and the crossbeam 2 binding face, second pitch caulking paste layer 6 can be with the even loading of the gravity of steel bridge deck slab layer 3 on crossbeam 2. Meanwhile, when the length of the steel bridge deck layer 3 changes, the second asphalt caulking paste layer 6 provides possibility for micro-movement of the steel bridge deck layer 3 relative to the cross beam 2. The thickness of the second layer of asphalt caulking paste 6 is preferably set at 5 mm. At the moment, the bridge body is sequentially provided with a beam 2 with the thickness of 250mm, a second asphalt caulking paste layer 6 with the thickness of 5mm, a steel bridge deck layer 3 with the thickness of 86mm, an epoxy mortar pouring layer 8 with the thickness of 38-65 mm and a floor tile 9 with the thickness of 20mm from bottom to top, wherein the floor tile 9 is usually an anti-skid floor tile 9.

In order to further optimize the above embodiment, a steel mesh is further arranged between the epoxy mortar pouring layer 8 and the steel bridge deck layer 3. And (3) paving and welding a reinforcing mesh with the thickness of 8mm above the steel bridge deck slab layer 3, and then pouring epoxy mortar to form an epoxy mortar pouring layer 8. The arrangement of the reinforcing mesh layer 7 can improve the adhesion between the epoxy mortar pouring layer 8 and the steel bridge deck layer 3. The thickness of the epoxy mortar pouring layer 8 is not less than 38mm, and the epoxy mortar pouring layer gradually thickens from two sides of the bridge deck structure body in the width direction to the middle, so that a certain gradient is formed from two sides of the bridge deck structure body to the middle, and the gradient is preferably set to be less than 1%.

In the above embodiment, the bridge deck structure body and the truss structure of the invention are, from bottom to top, a 250mm steel beam 2, a 5mm thick second asphalt caulk layer 6, a 86mm steel deck plate layer 3, an 8mm steel mesh layer 7, a 38-65 mm thick epoxy mortar casting layer 8 and a 20mm thick anti-skid floor tile 9 in sequence. The cross beam 2 and the lower chord of the main beam are welded by fusion penetration, and the schematic diagram of the welding can refer to fig. 2.

The cross beam 2 is made of I-shaped steel with the height of 250 × 175 × 10 × 12, the second stiffening plates 21 with the thickness of 218 × 82.5.5 82.5 × 12 are respectively arranged in notches on two sides of the I-shaped steel every 900-1000 mm, the second stiffening plates 21 are perpendicular to the length direction of the cross beam 2 and are connected with the cross beam 2 through 7mm fillet welds, and the second stiffening plates 21 are used for improving the rigidity of the cross beam 2.

Referring further to fig. 4 to 8, the steel bridge deck is made of a steel grating with a height of 86mm, the steel grating comprises a bridge deck body 31 welded in parallel and a first stiffening plate 32 welded perpendicularly to the bridge deck body 31, the first stiffening plate 32 is perpendicular to a plane formed by the bridge deck body 31 and can effectively improve the rigidity of the steel bridge deck layer 3, the first stiffening plate 32 and the bridge deck body 31 are arranged in equal length, bent covering edges 33 covering the first stiffening plate 32 are arranged at two ends of the bridge deck body 31, the bent covering edges 33 are L-shaped covering edges arranged perpendicularly to the tail end of the bridge deck body 31, covering grooves which are downward relative to the bridge deck body 31 and are used for embedding the first stiffening plate 32 are formed at two ends of the bridge deck body 31 in the length direction, two sides of the first stiffening plate 32 are connected by 6mm angle welding seams, the first stiffening plate 32 is welded once every 150mm, and the bridge deck body 31 and the first stiffening plate 32 are processed to form a steel grating with a thickness of 86 mm.

The length of the bridge deck is determined by the distance between the two cross beams 2, the bridge deck is about 1500mm, the width is 5800mm, welding and assembling can be carried out in a factory for ensuring the integrity of the bridge deck, and the bridge deck can be hoisted in blocks after being transported to a site.

The construction scheme of the bridge deck structure is that a main bridge lower chord 1 and a cross beam 2 are hoisted and fixed to form a truss structure for supporting a bridge deck structure body; paving a second asphalt caulking paste layer 6 with the thickness of 5mm on the beam 2 → transporting the steel bridge deck slab layer 3 welded and formed in a factory to the site and installing → connecting the steel bridge deck slab layer 3 with the beam 2 by using an anchor bolt 5 → welding a steel bar mesh layer 7 with the thickness of 8mm on the bridge deck → pouring to form an epoxy mortar pouring layer 8 → paving an anti-skidding floor tile 9 with the thickness of 20mm after the epoxy mortar pouring layer 8 reaches the design strength and filling asphalt caulking paste into the expansion joint to form a first asphalt caulking paste layer 4.

The steel bridge deck plate layer 3 can be prefabricated in a factory and assembled in sections, meanwhile, the lower bridge deck plate body 31 can be used as a bottom die of the epoxy mortar pouring layer 8, the mounting and dismounting work of the formwork is reduced, the construction period is shortened, and meanwhile, the traffic of the road surface is not influenced in the construction process.

Expansion joints are arranged between the steel bridge deck slab layers 3 and filled with asphalt caulking paste, so that the length of each section of bridge deck structure is reduced, and the influence of stress generated by temperature change on the bridge deck structure is reduced.

The epoxy mortar has waterproof performance, the epoxy mortar shrinks and creeps, the strength, particularly the early strength, is high, the curing period is short, the construction period of the pavement is effectively shortened, and the influence of shrinkage and creep on the bridge deck structure is reduced.

Pouring epoxy mortar on the steel bridge deck slab layer 3 can prevent the bridge deck slab body 31 from fatigue and integral or local buckling too early while increasing the integral rigidity of the bridge deck structure body.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The bridge deck structure of the steel truss bridge provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (10)

1. The bridge deck structure of the steel truss bridge is characterized by comprising a bridge deck structure body and a truss structure used for supporting the bridge deck structure body; the truss structure comprises main bridge lower chords (1) which are arranged in parallel and cross beams (2) which are connected among the main bridge lower chords (1) at preset intervals;

the bridge deck structure body comprises a steel bridge deck panel layer (3), an epoxy mortar pouring layer (8) and floor tiles (9) laid above the epoxy mortar pouring layer (8) from bottom to top, and the steel bridge deck panel layer (3) is fixed to the cross beam (2) in a lap joint mode;

the steel bridge deck slab layer (3) comprises a bridge deck slab body (31) and a first stiffening plate (32) which is perpendicular to the bridge deck slab body (31) and is welded to the bridge deck slab body (31), and expansion joints are reserved between the adjacent steel bridge deck slab layers (3) which are lapped on the same cross beam (2).

2. Bridge deck structure of steel truss bridges according to claim 1, wherein the expansion joints are filled with a first layer of asphalt caulking paste (4).

3. Bridge deck structure of steel truss bridges according to claim 1, wherein the first stiffening plates (32) are arranged with equal length to the deck slab body (31), and both ends of the deck slab body (31) are provided with bent rims (33) covering the first stiffening plates (32).

4. The bridge deck structure of the steel truss bridge according to claim 3, wherein the cross beams (2) are I-shaped steel, and second stiffening plates (21) are arranged in the notches at the two sides of the I-shaped steel, and the second stiffening plates (21) are arranged perpendicular to the length direction of the cross beams (2).

5. Bridge deck structure of steel truss bridges according to claim 4, wherein the steel bridge deck (3) is connected with the cross beams (2) by anchor bolts (5), and bolt holes provided in the steel bridge deck (3) and/or in the cross beams (2) and cooperating with the anchor bolts (5) are slotted holes.

6. Bridge deck structure of steel truss bridges according to claim 5, wherein a second layer of asphalt caulking paste (6) is laid between the steel bridge deck (3) and above the girders (2).

7. Bridge deck structure of steel truss bridges as claimed in any of the claims 1 to 6, wherein a layer of reinforcement mesh (7) is welded on top of the steel bridge deck (3).

8. Bridge deck structure of steel truss bridges according to claim 7, wherein the thickness of the epoxy mortar casting layer (8) is 38-65 mm.

9. The deck structure of steel truss bridges of claim 8, wherein the gradient of the deck structure body from both sides to the center in the width direction is less than or equal to 1%.

10. Bridge deck structure of steel truss bridges according to claim 9, wherein the cross girders (2) are fusion welded to the main bridge lower chords (1).

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