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

Abstract

The invention discloses a bridge deck structure of a steel truss bridge. a beam connected between the lower chords of the main bridge; the bridge deck structure body includes a steel bridge deck layer, an epoxy mortar pouring layer and floor tiles laid on the epoxy mortar pouring layer in sequence from bottom to top, The steel bridge deck layer is lapped and fixed on the beam; the steel bridge deck layer includes a bridge deck body and a first stiffening plate welded perpendicular to the bridge deck body, and overlapped with adjacent parts of the same beam. Expansion joints are reserved between the steel bridge deck layers. The steel truss bridge provided by the invention prolongs the service life of the deck structure, reduces the difficulty of construction, and solves the problem of inconvenience in construction.

Description

A bridge deck structure of a 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 technique

At present, the deck structure and pavement of steel truss bridges is an important problem facing the world. The forms used in 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 deck stiffness and poor durability, and crack damage also occurs frequently. The commonly used bridge deck paving materials at this stage mainly include epoxy asphalt mixture, There are three forms of asphalt concrete and modified asphalt SMA. The deck structure of steel truss bridge is mainly steel deck plus deck pavement, reinforced concrete or prestressed concrete plus deck pavement, and steel-concrete composite deck plus deck pavement.

The overall stiffness of the steel bridge deck plus the bridge deck pavement is small, the bridge deck is easy to deform, and it is prone to premature fatigue and global or local buckling. The overall stiffness of reinforced concrete or prestressed concrete plus bridge deck pavement is higher, but because the concrete or prestressed concrete is stressed, the bridge deck structure is thicker and the bridge deck weight is larger. At the same time, because the pedestrian bridge is mainly on the urban road, when the concrete is poured, it is necessary to erect the formwork, and the road surface needs to be occupied to affect the traffic when setting the bracket, and the construction period is long, so it is not suitable for the pedestrian bridge on the urban road.

There are many styles of steel-concrete composite deck and deck pavement, but the steel plate stiffeners of the composite deck need to be welded with the chords of the truss. Due to the long length of the main girder, the bridge deck structure shrinks due to concrete shrinkage. Creep and other effects have an impact on the stress of the steel plate, and the concrete is prone to some cracking over time. And due to the bridge span, in large-span bridges, the temperature change will also affect the bridge deck structure, resulting in damage.

Therefore, how to optimize the bridge deck structure, prolong the service life and solve the problem of inconvenient construction has become a technical problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a bridge deck structure of a steel truss bridge, which can prolong the service life of the bridge deck and solve the problem of inconvenience in construction.

In order to achieve the above object, the present invention provides a bridge deck structure of a steel truss bridge, which includes a bridge deck structure body and a truss structure used to support the bridge deck structure body; the truss structure includes parallel main bridge lower chords and a beam connected between the lower chords of the main bridge at a preset distance;

The bridge deck structure body includes a steel bridge deck layer, an epoxy mortar pouring layer and floor tiles laid on the epoxy mortar pouring layer in sequence from bottom to top, and the steel bridge deck layer is overlapped and fixed on the beam;

The steel bridge deck layer includes 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 overlapping the same beam.

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

Optionally, the first stiffening plate is provided with the same length as the bridge deck body, and both ends of the bridge deck body are provided with bent edges covering the first stiffening plate.

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

Optionally, the steel bridge deck layer and the beam are connected by anchor bolts, and the bolt holes opened on the steel bridge deck layer and/or opened on the beam and matched with the anchor bolts are oblong holes. .

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

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

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

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

Optionally, the cross beam and the lower chord of the main bridge are penetration welded.

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 on the bridge deck body; the steel bridge deck layer is used to carry epoxy mortar pouring Layers, reduce template settings. The epoxy mortar pouring layer matched with the pouring reduces the shrinkage and creep of the bridge deck, improves the structural strength and early strength, and the maintenance period is short, which shortens the construction period, and the floor tiles can be laid for pedestrians to walk.

The truss structure includes the lower chords of the main bridge arranged in parallel and the beams connected between the lower chords of the main bridge according to the preset spacing. Expansion joints are reserved between two adjacent bridge deck body structures connected to the same beam, which can be used to release the deformation caused by temperature changes and shrinkage and creep, and reduce the impact of temperature stress on the bridge deck structure.

Further, the above-mentioned steel bridge deck layer can be completed by pre-forming the bridge deck body and processing it with the first stiffening plate on the ground, and can be hoisted in place during the construction of the bridge deck structure, without the need to erect a support template under the truss structure, reducing the need for The difficulty of construction and the impact on ground traffic.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

1 is a schematic diagram of a bridge deck structure of a steel truss bridge provided by an embodiment of the present invention;

Fig. 2 is the welding schematic diagram of the lower chord and the lower beam of the main bridge in Fig. 1;

Fig. 3 is a partial enlarged view of Fig. 1;

Figure 4 is a schematic diagram of a steel bridge deck layer;

Fig. 5 is the B-B sectional view of Fig. 4;

Fig. 6 is the sectional view of C-C of Fig. 4;

Fig. 7 is the side view of the bridge deck body in Fig. 4;

FIG. 8 is an enlarged view of part D in FIG. 5 .

in:

1- Main bridge lower chord, 2- Beam, 21- Second stiffening plate, 3- Steel bridge deck layer, 31- Bridge deck body, 32- First stiffening plate, 33- Bending edge, 4- First Asphalt caulking layer, 5-anchor bolts, 6-second asphalt caulking layer, 7-reinforced mesh layer, 8-epoxy mortar pouring layer, 9-floor tiles.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In order to make those skilled in the art better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Please refer to FIGS. 1 to 8 , FIG. 1 is a schematic diagram of a deck structure of a steel truss bridge provided by an embodiment of the present invention, FIG. 2 is a schematic diagram of the welding of the lower chord and the lower beam of the main bridge in FIG. 1 , and FIG. 3 is FIG. 1 Figure 4 is a schematic diagram of the steel bridge deck layer, Figure 5 is a B-B sectional view of Figure 4, Figure 6 is a C-C sectional view of Figure 4, Figure 7 is a side view of the bridge deck body in Figure 4, FIG. 8 is an enlarged view of part D in FIG. 5 .

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. The bridge deck structure body includes a steel bridge deck layer 3 , an epoxy mortar pouring layer 8 and a floor tile 9 laid on the epoxy mortar pouring 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 is welded on the adjacent deck body 31. The seam of the bridge deck body 31 . The steel bridge deck layer 3 and the epoxy mortar layer cooperating with the pouring reduce the shrinkage and creep of the bridge deck, improve the structural strength and early strength, and the maintenance period is short, which shortens the construction period.

The truss structure includes a main bridge lower chord 1 arranged in parallel and a beam 2 connected between the main bridge lower chords 1 according to a preset spacing. The length direction of 1 is overlapped between the two adjacent bridge deck body structures of the same beam 2 to reserve expansion joints, which can be used to release the deformation caused by temperature changes and shrinkage and creep, and reduce the temperature stress on the bridge deck structure. Impact. 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 pouring layer 8, there is no need to erect a supporting formwork under the truss structure, reducing the The difficulty of construction and the impact on ground traffic.

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

Please refer to FIG. 1 to FIG. 3 , in the specific embodiment provided by the present invention, the bridge deck structure body adopts the steel bridge deck layer 3 , the epoxy mortar pouring layer 8 and the epoxy mortar pouring layer 8 arranged in sequence from bottom to top. Floor tile 9 above level 8. The truss structure includes a pair of main bridge lower chords 1 and a plurality of sets of transverse 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 the two adjacent steel bridge deck layers 3 that are lapped and fixed on the same beam 2, and the width of the expansion joint is set to about 10mm, which is used to release the steel deck. The deformation of the bridge deck layer 3 due to temperature changes and shrinkage creep.

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

In order to facilitate the temperature change shrinkage of the steel bridge deck layer 3, the steel bridge deck layer 3 and the beam 2 are fixedly connected through the anchor bolts 5, and are opened on the steel bridge deck layer 3 and on the beam 2, used for and anchor bolts. 5. At least one of the matching bolt holes adopts an oblong hole or an oval hole, and the length direction of the oblong hole or the oval hole is perpendicular to the length direction of the 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 the influence of temperature and shrinkage and creep, the anchor bolts 5 can follow the length of the oblong hole. The direction is slightly moved, and the width of the expansion joint changes. The anchor bolts 5 are M10×110 bolts.

Further, a second asphalt caulking paste layer 6 is also provided between the steel bridge deck layer 3 and the bonding surface of the beam 2 , and the second asphalt caulking paste layer 6 can evenly load the gravity of the steel bridge deck layer 3 . on 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 a possibility for the slight movement of the steel bridge deck layer 3 relative to the beam 2 . The thickness of the second asphalt caulking layer 6 is preferably set at 5 mm. At this time, the bridge body from bottom to top is the 250mm beam 2, the 5mm second asphalt caulking paste layer 6, the 86mm steel bridge deck layer 3, the 38-65mm thick epoxy mortar pouring layer 8 and the 20mm thick floor tiles. 9. Floor tiles 9 are usually non-slip floor tiles 9 .

In order to further optimize the above embodiment, a steel mesh is also provided between the epoxy mortar pouring layer 8 and the steel bridge deck layer 3 . A steel mesh with a thickness of 8mm is used to spread and weld on the top of the steel bridge deck layer 3 , and then epoxy mortar is poured to form an epoxy mortar pouring layer 8 . The arrangement 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 pouring layer 8 should not be less than 38mm, and gradually increase from the two sides of the width direction of the bridge deck structure body to the middle, so as to form a certain slope from the two sides of the bridge deck structure body to the middle, the slope is preferably set below 1%.

In the above embodiment, the main body of the bridge deck structure and the truss structure of the present invention are 250mm steel beams 2, 5mm thick second asphalt caulking paste layer 6, 86mm steel bridge deck layer 3, 8mm steel mesh layer 7 in order from bottom to top , 38 ~ 65mm thick epoxy mortar pouring layer 8 and 20mm thick non-slip floor tiles 9. The cross beam 2 and the lower chord of the main beam adopt penetration welding, and the schematic diagram of the welding can refer to FIG. 2 .

The beam 2 is made of I-beams with a height of 250×175×10×12, and a second stiffening plate 21 of 218×82.5×12 is set in the grooves on both sides of the I-beam every 900-1000mm. The second stiffening plate 21 The length direction of the vertical beam 2 is arranged and connected with the beam 2 by a 7mm fillet weld. The second stiffening plate 21 is used to increase the rigidity of the beam 2 .

Please further refer to FIGS. 4 to 8 , the steel bridge deck adopts a steel grating with a height of 86 mm, and the steel grating includes a bridge deck body 31 welded in parallel and a first stiffening plate 32 vertically welded 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 provided at the same length, and the two ends of the bridge deck body 31 are provided with bent edges 33 covering the first stiffening plate 32 . The bending edging 33 is specifically an L-shaped edging set at the end of the vertical bridge deck body 31 , and cooperates with the bridge deck body 31 to form sagging relative to the bridge deck body 31 at both ends in the length direction of the bridge deck body 31 and is used to embed the first stiffener. The cladding groove of the plate 32 . The two sides of the first stiffening plate 32 are connected by 6mm fillet welds, which are welded every 150 mm, and the first stiffening plate 32 is processed. The bridge deck body 31 and the first stiffening plate 32 form a steel grid with a thickness of 86 mm.

The length of the bridge deck is determined by the distance between the two beams 2. In the present invention, it is about 1500mm and the width is 5800mm. In order to ensure the integrity of the bridge deck, it can be welded and assembled in the factory. After transporting to the site, it can be divided into pieces. Hoisting.

The construction scheme of the bridge deck structure of the present invention is to hoist and fix the lower chord 1 of the main bridge and the beam 2 to form a truss structure supporting the body of the bridge deck structure; The factory welded and formed steel bridge deck 3 is transported to the site and installed → the steel bridge deck 3 and the beam 2 are connected with anchor bolts 5 → 8mm steel mesh layer 7 is welded on the deck bridge → poured to form epoxy Mortar pouring layer 8 → After the epoxy mortar pouring layer 8 reaches the design strength, lay 20mm thick anti-skid floor tiles 9 and fill the expansion joint with asphalt caulking paste to form the first asphalt caulking paste layer 4 .

The steel bridge deck layer 3 can be prefabricated in the factory and assembled in sections. At the same time, the underlying bridge deck body 31 can be used as the bottom form of the epoxy mortar pouring layer 8, which reduces the installation and removal of the formwork, shortens the construction period, and at the same time in the construction process. without affecting road traffic.

Expansion joints are arranged between the steel bridge deck layers 3 and filled with asphalt caulking paste, which reduces the length of each section of the bridge deck structure, thereby reducing the influence of the stress generated by temperature changes on the bridge deck structure.

Epoxy mortar itself has waterproof performance, and the shrinkage and creep of epoxy mortar itself is small, the strength is especially high in the early stage, and the maintenance period is short, which effectively reduces the construction period of the pavement and reduces the impact of shrinkage and creep on the bridge deck structure.

The epoxy mortar poured on the steel bridge deck layer 3 can prevent the bridge deck body 31 from premature fatigue and overall or local buckling while increasing the overall rigidity of the bridge deck structure body.

It should be noted that, in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such existence between these entities. The actual relationship or sequence.

The bridge deck structure of the steel truss bridge provided by the present invention has been described in detail above. The principles and implementations of the present invention are described herein by using specific examples, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection 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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