CN100543232C - Double-layer continuous girder bridge with steel-concrete composite structure - Google Patents

Abstract

The invention relates to a double-layer continuous girder bridge of steel-concrete composite structure, comprising a bridge pier (1), a steel girder (2) and a bridge deck (3), wherein the bridge pier (1) supports the steel girder (2), and the steel girder (2) supporting bridge deck (3). The steel girder (2) is mainly composed of steel webs (21), small longitudinal beams (22) and upper beams (23), and the upper beams (23) and the small longitudinal beams (22), arranged at certain intervals along the longitudinal direction of the bridge, The steel webs (21) are orthogonal and fixed, and a lower beam (5) is correspondingly arranged under each upper beam (23), and the lower beam (5) at the non-pier (1) is connected to the steel web (21), The lower beam (5) at the bridge pier (1) is rested on the support beam (7) arranged on the top of the pier, and the sidewalk slab (10) is laid on the lower beam (5). The invention has the characteristics of the traditional steel truss structure and the combined structure of the steel plate girder, can effectively use the space, save the construction cost, and has a beautiful appearance.

Description

Double-layer continuous girder bridge with steel-concrete composite structure

technical field

The invention relates to a continuous girder bridge, in particular to a double-layer continuous girder bridge with steel-concrete composite structure.

Background technique

With the rapid development of my country's economy and the acceleration of urbanization, the traffic flow in cities is also increasing, and the lack of capacity of cross-river bridges has become a bottleneck in the transportation network of most cities across the river (river). The necessity and urgency of this will also appear. Comprehensively considering factors such as technical performance, space utilization, construction speed, and economic benefits, bridges in existing cities at home and abroad are increasingly adopting steel structures and steel-concrete composite structures, among which steel plate girder composite structures and steel truss structures are common structure type. The traditional steel plate girder composite structure generally adopts a Π-shaped cross section, as shown in Figure 1, which is mainly composed of longitudinal steel girders 11, transverse steel girders 12, vertical stiffeners 13 and concrete bridge decks 14. The commonly used structure is to set two longitudinal steel girders 11, and connect the two longitudinal steel girders 11 to the position of the vertical stiffener 13 through the transverse steel girder 12, and the vertical stiffener 13 is generally not connected with the concrete bridge deck 14. Steel plate girder composite structures are generally suitable for medium and small-span bridges with narrow decks. For wider decks, it is necessary to stretch the transverse prestressed steel bars 15 in the concrete bridge deck 14 or adopt transverse cantilever steel beams. Due to the poor permeability of the steel plate girder composite structure, it is not suitable for double-deck bridges. The steel truss girder bridge is a relatively old bridge type, which is composed of upper and lower chords and web members, and each member only bears axial force. Compared with the steel plate girder composite structure, the steel truss girder structure has better permeability, so it is the first choice for double-deck bridges. For railway bridges only. In addition, most of the existing urban bridges are equipped with sidewalks. If the sidewalks are installed on the bridge deck, firstly, the width of the bridge deck will be increased, and secondly, mixed flow of people and vehicles will inevitably occur in the traffic flow on the bridge. It affects the speed of vehicles crossing the bridge, and it is also easy to cause hidden dangers to traffic safety on the bridge.

With people's emphasis on urban aesthetics and the continuous improvement of urban quality requirements, the aesthetic function of bridges has become unavoidable. Most of the urban bridges built in our country in the last century are based on functional, technical or economical perspectives. Bridges generally adopt the forms of conventional beam bridges, arch bridges, cable-stayed bridges and suspension bridges. These forms of bridges are in the context of the overall urban landscape , it seems a bit dull and monotonous, and it is not coordinated with the environment of the bridge site, which affects the overall aesthetic feeling of urban buildings.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and provide a combination structure with the characteristics of traditional steel truss structure and steel plate girder, which can effectively use space, save construction cost, divert people and vehicles, and has a beautiful appearance, and is suitable for construction. A double-layer continuous girder bridge with steel-concrete composite structure built in the downtown area of the city.

In order to solve the above technical problems, the technical solution proposed by the present invention is: a double-layer continuous girder bridge of steel-concrete composite structure, comprising bridge piers, steel girders and bridge decks, the bridge piers support the steel girders, and the steel girders support the bridge decks, It is characterized in that the steel girder is mainly composed of steel webs, small longitudinal girders and upper beams, two steel webs constitute the two side plates of the steel girder, and the small longitudinal girders are located below the longitudinal centerline of the bridge deck. The upper beams arranged at intervals along the longitudinal direction of the bridge are perpendicular to the small longitudinal beams and steel webs and are fixed. A lower beam is correspondingly arranged under each upper beam. It rests on the support beam set on the top of the pier, and paves the sidewalk slab on the lower beam.

When the projection of the bottom surface of the steel web on the vertical plane is a curve, if the lower beam is located below the bottom surface of the steel web, the lower beam is fixed below the steel web with a suspender as a connector; if the lower beam is located Above the bottom surface of the steel web, the lower beam is directly fixed (welded or bolted) to the steel web, or the support plate fixed on the inner side of the steel web is used as a support, and the lower beam rests on the support plate.

When the above-mentioned steel web is a rectangular straight plate structure, if the lower beams are all located below the bottom surface of the steel web, then the lower beams are fixed to the steel web through suspenders as connectors; if the lower beams are all located above the bottom surface of the steel web, The lower beam is directly fixed (welded or bolted) to the steel web, or the support plate fixed on the inner side of the steel web is used as a support, and the lower beam is placed on the support plate.

The above-mentioned upper beam is a cantilever beam, and the bridge deck supported by the upper beam is spliced by prefabricated low-rib bridge deck blocks, and the longitudinal wet joints of adjacent prefabricated low-rib bridge deck blocks are set on the steel web and Or above the small longitudinal girder, the transverse cast-in-place wet joints of the adjacent prefabricated low-rib bridge deck blocks are set above the upper beam, and the prefabricated low-rib bridge deck blocks are provided with reserved steel bars extending into the cast-in-place wet joints , the reserved steel bars protruding from two adjacent prefabricated low-rib bridge deck blocks are welded and connected, and all cast-in-place wet joints are densely covered with tack shear nails.

The traffic lane on the above-mentioned bridge deck is connected with the urban road network through the bridge approach bridge, and the sidewalk on the sidewalk board is connected with the city's riverside scenery belt.

The above-mentioned steel web is a hollow-type I-shaped steel beam, and patterns and/or lights are embedded in the hollow.

The above-mentioned piers are vase-shaped thin-walled pier structures.

Compared with the prior art, the present invention has the advantages of:

1. The steel-concrete combined structure double-layer continuous girder bridge of the present invention combines the characteristics of steel truss girder and traditional steel plate girder combined structure, and implements the complete separation of people and vehicles. The total width of the bridge can effectively use the structural space, and correspondingly reduce the pressure on road space caused by the shortage of urban land resources. Due to the reduced bridge width, if the span is selected properly, the cost can also be saved accordingly.

2. The steel-concrete composite structure of the present invention makes the superstructure of the bridge lighter in weight, and the bridge deck adopts the form of cantilever extension in the transverse direction, which reduces the distance between the two steel webs, which makes the bridge lower pier, abutment and The size of the foundation can be greatly reduced, which not only reduces the construction cost of the bridge substructure, but also increases the usable space under the bridge. In addition, by adjusting the cantilever length of the upper beam, the width of the driveway and sidewalk can be adjusted as required. The overhanging cantilever part of the bridge deck supported by the upper beam can also avoid the erosion of rainwater and sunlight ultraviolet rays on the steel structure of the bridge to the greatest extent. According to the current protection level, the steel structure of the bridge body can be guaranteed for at least 30 years after protective treatment. Year.

3. Both the bridge deck and the sidewalk slab of the present invention are prefabricated concrete slabs. In order to ensure the bending rigidity of the bridge deck, the bridge deck adopts a prefabricated low-rib concrete slab structure. Since the upper structure of the bridge is prefabricated, it can be carried out simultaneously with the foundation construction, which not only ensures the construction quality, reduces the impact of bridge deck shrinkage and creep, but also speeds up the construction speed of the bridge, which can minimize the impact of bridge construction on Negative effects of urban traffic and making the bridge operational in the shortest possible time.

4. Most of the rivers and rivers in today’s cities are equipped with scenic belts along the river. The present invention can make the upper carriageway communicate with the urban road network through the approach bridge, and the lower sidewalks directly communicate with the scenic belts along the river (river). Pedestrians can walk along the river ( River) Scenic Area directly on the bridge, which is very convenient, thus overcoming the problem of setting up a mixed pedestrian-vehicle interchange at the bridgehead; the upper layer is dedicated to cars, and the vehicles are unimpeded, and the lower layer of pedestrians can avoid the sun and rain, which is safe and comfortable, and greatly improves the quality of the bridge. level of service. If it is required by traffic planning, the lower floor can also consider the layout of bus lines. Reserved pipeline troughs can be arranged on both sides of the sidewalk as required to facilitate the layout, installation, inspection and maintenance of pipelines.

5. The steel web of the present invention can be air-permeable, and the projection of its bottom surface on the vertical plane is curved. The steel girder under this design presents a drop-shaped air-permeable beam body with variable height, which makes The appearance of the bridge is light and graceful, and it looks like a long dragon lying on the waves from a distance, full of dynamics. The mechanical characteristics of the permeable steel web combine the mechanical characteristics of the plate and the truss. Compared with the truss beam with high permeability, the overall stiffness of the bridge is improved while maintaining good permeability. The hollow part of the steel web can introduce different patterns with classical architectural style according to the actual situation, and can also choose not to inlay patterns or embed other patterns. The lower pier adopts vase-style thin-walled pier, so as to maintain the unity of the classical architectural style of the bridge itself, and to set off harmoniously with the environment of the bridge site, maintain good visual effect and aesthetic value, and together constitute a beautiful scenery in the city.

Description of drawings

Fig. 1 is the cross-sectional schematic diagram of traditional steel plate girder composite structure;

Fig. 2 is the bridge single-span structure schematic diagram of the present invention;

Fig. 3 is a schematic cross-sectional view of the steel girder at the suspender connector;

Fig. 4 is the schematic diagram of the cross section of the steel girder at the bridge pier;

Fig. 5 is a schematic cross-sectional view of the steel girder at the support plate support;

Fig. 6 is the sectional view of F-F place in Fig. 2;

Figure 7 is a structural schematic diagram of the quartering method of the bridge deck;

Fig. 8 is a structural schematic diagram of the method of thirds of the bridge deck;

Fig. 9 is a structural schematic diagram of bridge deck dichotomy;

Figure 10 is the B pattern pattern at the hollow part of the steel web;

Figure 11 shows the C pattern pattern at the hollow part of the steel web;

Fig. 12 is a partially enlarged schematic diagram of place A in Fig. 6;

Fig. 13 is the schematic diagram of the bridge single-span structure adopting the rectangular steel web of the present invention;

Fig. 14 is a schematic diagram of the connection between the present invention and the scenery belt along the river;

Fig. 15 is a schematic diagram of step 1 of the construction method of the present invention;

Fig. 16 is a schematic diagram of step 2 of the construction method of the present invention;

Fig. 17 is a schematic diagram of step three of the construction method of the present invention;

Fig. 18 is a schematic diagram of step 4 of the construction method of the present invention;

Fig. 19 is a schematic diagram of step five of the construction method of the present invention;

Fig. 20 is a schematic diagram of step six of the construction method of the present invention;

Fig. 21 is a schematic diagram of Step 7 of the construction method of the present invention.

illustration:

1. Bridge piers 11. Longitudinal steel girders

12. Horizontal steel beams 13. Vertical stiffeners

14. Concrete bridge deck 15. Transverse prestressed reinforcement

2. Steel main girder 21. Steel web

22. Small longitudinal beam 23. Upper beam

24. Vertical stiffener 3. Bridge deck

31. Reserved steel bars 32. Wet joints at steel webs

33. Wet joints at small longitudinal beams 34. Wet joints at upper beams

35. Prefabricated low-rib bridge deck blocks 4. Suspenders

41. Support plate 5. Lower beam

6. Big head shear nail 7. Support beam

71. Pier top support 8. Asphalt concrete bridge deck

9. Reserved pipeline trough 10. Sidewalk board

Detailed ways

As shown in Figures 2 to 14, the steel-concrete composite structure double-layer continuous girder bridge of the present invention combines the characteristics of steel truss girders and traditional steel plate girder composite structures, and it includes bridge piers 1, steel girders 2 and bridge decks 3, bridge piers 1 supports the steel girder 2, and the steel girder 2 supports the bridge deck 3, wherein the steel girder 2 is mainly composed of a hollow steel web 21, a small longitudinal beam 22 and a cantilevered upper beam 23, and the bridge deck 3 is composed of The prefabricated low-rib bridge deck blocks 35 are assembled and connected by pouring joints. The steel web 21 adopts an I-beam structure, and the inner side of the steel web 21 is provided with vertical stiffeners 13 (see FIG. 6 ) at a certain interval to enhance its local rigidity. The small longitudinal girder 22 is located below the longitudinal centerline of the bridge deck 3. According to the load on the bridge and the span length of the bridge, upper beams 23 are arranged at intervals along the longitudinal direction of the bridge. 21 are vertically orthogonal and welded (also can be fixed by bolts). A corresponding lower beam 5 is set directly below each upper beam 23, the lower beam 5 at the non-pier 1 is connected to the steel web 21, and the lower beam 5 at the bridge pier 1 rests on the support beam 7 set on the top of the bridge pier 1 , the load is directly borne by the support beam 7, the support beam 7 is supported by the pier top support 71, and the steel web 21 is provided with a vertical stiffener 24 outside the pier top support 71 to strengthen its local stiffness (as shown in Figure 4 shown). The lower beams 5 all adopt the I-beam structure, and are located at the same height, and all the lower beams 5 are used as supports for the pavement slabs 10 laid on their upper parts.

The projection of the bottom surface of the steel web 21 on the vertical plane is curved, and the lower beam 5 is located at the same level, so the lower beam 5 is located below the bottom surface of the steel web 21 near the middle of the single span. The steel web 21 is fixedly connected with the suspender 4 as a connector, one end of the suspender 4 is connected to the steel web 21, and the other end is connected to the lower beam 5, and the lower beam 5 transmits the load it bears to the steel web 21 through the suspender 4 ( As shown in Figure 3); and the part of the lower beam 5 near the pier 1 is located above the bottom surface of the steel web 21, and now the lower beam 5 uses the support plate 41 fixed on the inner side of the steel web 21 as a support (also can The lower beam 5 is directly fixed on the inner side of the steel web 21), the lower beam 5 rests on the support plate 41, and the support plate 41 bears its load (as shown in FIG. 5 ). The steel web can also adopt a rectangular straight plate structure. If the lower beams at non-pier locations are all located below the bottom surface of the steel web due to design requirements, suspenders are used as connectors to connect with the steel web; When all the lower beams at the pier are above the bottom of the steel web, all the lower beams are directly fixed (welded or bolted) to the steel web, or the support plate fixed to the inner side of the steel web is used as a support. The lower beam rests on the support plate. The structure shown in Figure 13 is the situation when the steel web 21 is a rectangular straight plate structure, and the lower beam 5 is all located above the bottom surface of the rectangular steel web 21. At this time, the lower beam 5 is directly fixed (welded or bolted) to the steel web. 21 on. Regardless of the form of the steel web or the connection method between the steel web and the lower beam, the lower beam 5 at the pier 1 can still be placed directly on the support beam 7 at the top of the pier 1 .

An asphalt concrete bridge deck 8 is laid on the bridge deck 3, and the asphalt concrete bridge deck 8 is a carriageway; Due to the complete separation of pedestrians and vehicles from the upper carriageway and the lower sidewalk, this not only reduces the total width of the bridge, effectively utilizes the space of the bridge structure, but also reduces the pressure on road space caused by the shortage of urban land resources. Due to the reduced bridge width, if the span is selected properly, the cost can also be saved accordingly. The upper carriageway is connected to the urban road network through bridge approach bridges, and the lower sidewalk is directly connected to the urban riverside (river) scenery belt D, which is next to Yanjiang Avenue E. The bridge overcomes the problem of setting up a mixed pedestrian-vehicle interchange at the bridge head (as shown in Figure 14); the upper layer is dedicated to cars, and the vehicles are unimpeded, and the lower layer of pedestrians avoids the sun and rain to cross the bridge, which is safe and comfortable, which greatly improves the service level of the bridge . In addition, by adjusting the cantilever length of the upper beam 23, the width of the bridge driveway and sidewalk can be adjusted as required. If it is required by traffic planning, the lower floor can also consider the layout of bus lines. Reserved pipeline grooves 9 are arranged on both sides of the sidewalk as required to facilitate the layout, installation, inspection and maintenance of pipelines.

In order to ensure the bending rigidity of the bridge deck 3 under the carriageway, the bridge deck 3 is spliced by prefabricated low-rib bridge deck blocks 35 . As shown in Figure 7, with the positions of the three longitudinal beams, the longitudinal steel webs 21 on both sides and the small longitudinal beam 22 in the middle, as the boundary, the bridge deck 3 in this embodiment has the length of the prefabricated low-rib bridge deck block 35 As a unit, it is divided into four parts of equal width along the transverse direction of the bridge (it can also be divided into three parts as shown in Figure 8 or two parts as shown in Figure 9 according to actual needs). The width of the panel blocks 35 is spliced in sequence, and there are cast-in-place wet joints between the prefabricated low-rib bridge deck blocks 35, including the wet joints 32 at the steel web, the wet joints 33 at the small longitudinal girders and the upper beams. Wet seams34. Each prefabricated low-rib bridge deck block 35 is provided with reserved steel bars 31 extending into the cast-in-place wet joints. By welding the exposed reserved steel bars 31 protruding from the cast-in-place wet joints and pouring the joints, the joints can be The prefabricated low-rib bridge deck blocks 35 are connected to form an integral bridge deck 3 . The upper beam 23 , the small longitudinal beam 22 and the top of the steel web 21 are densely covered with tack shear nails 6 in the wet joints at the top of the steel web 21 to ensure that the connection between the bridge deck 3 and the steel girder 2 is firm. In the width direction of the bridge, the bridge deck 3 is in the form of a cantilever overhanging structure, which relatively shortens the distance between the two steel webs 21 below, thereby greatly reducing the size of the lower pier 1 and the foundation. In addition, the cantilevered bridge deck 3 can also avoid the erosion of rainwater and sunlight ultraviolet rays on the steel structure of the lower part of the bridge body. According to the current protection level, the steel structure of the lower part of the bridge body can be guaranteed for at least 30 years after protective treatment .

The projection of the bottom surface of the steel web 21 of the present invention on the vertical plane is a curve, and it is a hollow structure. The whole steel girder 21 presents a drop-shaped hollow beam body with variable height, which makes the appearance of the bridge light and light. Elegant, from a distance, it looks like a long dragon lying on the waves, full of dynamics. The mechanical characteristics of the permeable steel web 21 have both the mechanical characteristics of the plate and the truss. Compared with the truss beam with high permeability, the rigidity of the bridge as a whole is improved while maintaining good permeability. There are a series of round holes of different sizes on the steel web 21. According to the actual situation and landscape requirements, in this embodiment, different decorative patterns with classical architectural styles are embedded in the round holes of the steel web 21, as shown in Figure 10 and As shown in Fig. 11, it is also possible to choose not to inlay pattern or to embed other patterns according to actual needs. In order to match the classical architectural style of this embodiment, the lower pier 1 adopts a lighter vase-shaped thin-walled pier, and other types of pier can also be used according to the architectural style of the bridge itself, so as to make the architectural style of the bridge itself harmonious and unified , and can set off harmoniously with the environment of the bridge site, maintain a good visual effect, and together constitute a beautiful scenery in the city.

Construction steps:

As shown in Fig. 15～Fig. 21, construction of the present invention is carried out by following several steps:

Step 1: As shown in Figure 15, the foundation of the pier 1 is firstly constructed, and at the same time, the prefabricated low-rib bridge deck block 35 is prefabricated in the prefabrication yard, and the assembled cable crane equipment is erected in the river channel, and the erection of the cable crane equipment includes The construction of the cable crane foundation, the assembly of the tower, the suspension of the cable and the anchoring of the cable and other steps. Then, according to the hoisting capacity of the cable hoisting equipment, the number of hoisting segments of the steel web 21 is determined, and considering economy and construction speed, it is divided into three sections for hoisting in this embodiment.

Step 2: As shown in Figure 16, first complete the construction of pier 1; when the construction of pier 1 is completed, first hoist the No. 0 steel web on the top of the pier, and perform temporary consolidation at the top of the pier.

Step 3: As shown in Figure 17, block No. 1 and block No. 2 are hoisted sequentially symmetrically along both sides of block No. 0, block No. 1 is welded to block No. 0, and block No. 2 is welded to block No. 1. During the entire hoisting process of the steel web 21 , the pier top support 71 is in a temporary consolidation state, and it is necessary to avoid large unbalanced bending moments at the temporary consolidation of the pier top during the symmetrical hoisting process.

Steps 4 and 5: As shown in Figure 18 and Figure 19, after the hoisting of the No. 2 block of each span of the bridge is completed, the side spans will be constructed by means of full support; after the side spans are closed, the temporary consolidation of the side spans will be removed. Then close each span in the middle of the dragon in turn and remove the temporary consolidation at the top of all piers.

Step 6: As shown in Figure 20, after the main structure of the bridge is basically formed, install the prefabricated low-rib bridge deck block 35 (ie, the roadway slab), the sidewalk slab 10, and cast in-situ wet joints.

Step 7: As shown in Figure 21, remove the construction facilities such as cable cranes, carry out the construction of the bridge deck system and auxiliary facilities, and put the entire bridge into operation after completion and acceptance.

Since the main structure of the bridge girder is prefabricated, it can be carried out at the same time as the foundation construction, which can not only ensure the construction quality, reduce the impact of shrinkage and creep of the bridge deck 3, but also the construction speed is fast, which can minimize the impact on urban traffic. negative impact and put into operation in the shortest possible time.

Claims (9)

1, a kind of double-deck continuous girder bridge of steel-concrete combined structure, comprise bridge pier (1), steel girder (2) and bridge deck (3), bridge pier (1) support steel girder (2), steel girder (2) supporting bridge deck (3), it is characterized in that described steel girder (2) is mainly by steel web (21), stringer (22) and top rail (23) constitute, two steel webs (21) constitute the biside plate of described steel girder (2), stringer (22) is positioned at the longitudinal centre line below of bridge deck (3), top rail (23) and stringer (22) along bridge longitudinal separation layout, steel web (21) quadrature is also affixed, every top rail (23) below correspondence is provided with a lower transverse beam (5), the lower transverse beam (5) that non-bridge pier (1) is located is connected with steel web (21), the lower transverse beam (5) that bridge pier (1) is located is held on the support beam (7) of bridge pier (1) top setting, and lower transverse beam (5) is gone up and laid side walk slab (10).

2, the double-deck continuous girder bridge of steel-concrete combined structure according to claim 1, the bottom surface that it is characterized in that described steel web (21) is projected as curve on perpendicular, when lower transverse beam (5) was positioned at below, steel web (21) bottom surface, lower transverse beam (5) was fixed in steel web (21) below with suspension rod (4) as connector; When lower transverse beam (5) was positioned at top, steel web (21) bottom surface, lower transverse beam (5) directly was fixed on the steel web (21), and perhaps to be fixed in the inboard support plate (41) of steel web (21) as support member, lower transverse beam (5) is held on the support plate (41).

3, the double-deck continuous girder bridge of steel-concrete combined structure according to claim 1, it is characterized in that described steel web (21) is the straight plated construction of rectangle, if lower transverse beam (5) all is positioned at below, steel web (21) bottom surface, lower transverse beam (5) is all affixed as connector and steel web (21) by suspension rod (4); If lower transverse beam (5) all is positioned at top, steel web (21) bottom surface, lower transverse beam (5) directly is fixed on the steel web (21), and perhaps to be fixed in the inboard support plate (41) of steel web (21) as support member, lower transverse beam (5) is held on the support plate (41).

4, double-deck continuous girder bridge according to each described steel-concrete combined structure in the claim 1～3, it is characterized in that described top rail (23) is a semi girder, bridge deck (3) by top rail (23) supporting are spliced by prefabricated short rib type bridge floor plate (35), the vertical cast-in-place wet seam of adjacent prefabricated short rib type bridge floor plate (35) is arranged at steel web (21) and/or stringer (22) top, the horizontal cast-in-place wet seam of adjacent prefabricated short rib type bridge floor plate (35) is arranged at top rail (23) top, be provided with the reserved steel bar (31) that extends in the cast-in-place wet seam in the prefabricated short rib type bridge floor plate (35), the reserved steel bar (31) that stretches out in the adjacent two prefabricated short rib type bridge floor plates (35) is welded to connect, and is densely covered with major part WELDING STUDS (6) in the cast-in-place wet seam.

5, the double-deck continuous girder bridge of steel-concrete combined structure according to claim 4 is characterized in that the runway on the described bridge deck (3) is connected with city road network by access bridge, and the sidewalk on the side walk slab (10) is connected with the riverine scenic belt in city.

6, according to the double-deck continuous girder bridge of each described steel-concrete combined structure in the claim 1～3, it is characterized in that the runway on the described bridge deck (3) is connected with city road network by the bridge access bridge, the sidewalk on the side walk slab (10) is connected with the riverine scenic belt in city.

7, the double-deck continuous girder bridge of steel-concrete combined structure according to claim 5 is characterized in that described steel web (21) is the exposed throughout type girder steel, and saturating vacancy is embedded with floral designs and/or lamp decoration.

8, the double-deck continuous girder bridge of steel-concrete combined structure according to claim 7 is characterized in that described bridge pier (1) is vase formula Thin-Wall Piers structure.

9,, it is characterized in that described steel web (21) is the exposed throughout type girder steel according to the double-deck continuous girder bridge of each described steel-concrete combined structure in the claim 1～3.

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