Steel and concrete laminated slab arched composite beam bridge and construction method

Abstract

The invention relates to a steel and concrete laminated slab arched composite beam bridge and a construction method, the beam bridge comprises an embedded bridge abutment, a flat arch and a bridge deck slab, the embedded bridge abutment comprises a bridge abutment pile foundation and a concrete pedestal, the flat arch comprises a steel primary beam and a steel secondary beam, and the bridge deck slab comprises a steel secondary beam and a steel secondary beam. The concrete pedestal comprises a trapezoidal reinforced concrete bridge abutment and an embedded section of the steel girder, and the bridge abutment pile foundation is poured below the trapezoidal reinforced concrete bridge abutment; the steel main beam is arranged along the span direction of the bridge; the steel main beams are connected through the steel secondary beams; the bridge deck slab is of a reinforced concrete laminated slab structure, a prefabricated slab and a cast-in-place layer are combined to form a jointly stressed whole, and the prefabricated slab is laid between the steel secondary beams.

Description

Technical Field

[0001] The invention relates to the technical field of bridge structure engineering, and in particular to a steel and concrete composite slab arch composite beam bridge and a construction method. Background Art

[0002] At present, with the rapid advancement of transportation construction, traffic roads are gradually extending to some areas with complex terrain and environment, and the degree of three-dimensionality is getting higher and higher, forming a large number of special bridge structure construction needs. Therefore, it is necessary to propose corresponding reasonable and efficient structural forms. On the one hand, while ensuring safety, it can reduce the amount of bridge materials and construction difficulty, improve construction efficiency and economic benefits, and on the other hand, improve the spanning capacity of the bridge and reduce the impact of the structure on the lower road, river and surrounding environment. At the same time, when constructing in some natural and ecological scenic spots, it is necessary to take into account the beautiful appearance and not destroy the original scenery.

[0003] The cast-in-place or prefabricated concrete structure bridges in the relevant existing technologies are heavy, high, have poor spanning capacity, and have a long construction period. At the same time, a large number of temporary supports and large-scale lifting equipment are often required during the construction process, which has a great impact on the surrounding environment and the lower space. Traditional steel structure bridges, due to the problems of multiple segmented components, complex structure, and low material strength utilization rate, also have problems such as large structural height, the need for a large number of temporary supports, and cumbersome lifting procedures. At the same time, the traditional structure is relatively rigid in shape and lacks aesthetics. Summary of the invention

[0004] The present invention aims to provide a steel and concrete composite slab arched composite beam bridge and a construction method to solve the above-mentioned technical problems in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a steel and concrete composite slab arch composite beam bridge, including an embedded abutment, a flat arch and a bridge deck, the embedded abutment includes an abutment pile foundation and a concrete pedestal, the flat arch includes a steel main beam and a steel secondary beam, the concrete pedestal includes a trapezoidal reinforced concrete abutment and an embedded section of the steel main beam, the abutment pile foundation is cast below the trapezoidal reinforced concrete abutment; the steel main beams are arranged along the span direction of the bridge; the steel main beams are connected by steel secondary beams; the bridge deck adopts a reinforced concrete composite slab structure, which is a combined force-bearing whole formed by a precast slab and a cast-in-place layer, and the precast slabs are laid between the steel secondary beams.

[0006] Preferably, the steel main beam adopts a flat arch shape with a small curvature and a span ratio between 1 / 20 and 1 / 12. In the present application, small curvature refers to a curvature with a radius of curvature of more than 20m, which is a small curvature in the bridge.

[0007] Preferably, the steel secondary beam adopts an I-shaped section, and a bolt connector is arranged on the upper edge of the steel secondary beam to be combined with the reinforced concrete composite slab.

[0008] Preferably, the steel main beams are arranged in a "few main beam" form, that is, the spacing perpendicular to the span direction of the bridge is more than 10m.

[0009] Preferably, for bridges with a narrow deck width, only two or three steel main beams are used.

[0010] In this application, when the bridge deck width is less than 5m, it is considered that the bridge deck width is not large.

[0011] Preferably, the steel main beam adopts a cross-section form that is a combination of open and closed, with an open box section being adopted in the mid-span positive bending moment zone and a closed box section being adopted in the support negative bending moment zone.

[0012] Preferably, a common bolt connector is arranged at the upper edge of the open box section.

[0013] Preferably, the upper edge of the closed box section is arranged with a pull-out but not shear-resistant connector based on the force analysis results if the top plate is under tension, and an ordinary bolt connector if the top plate is not under tension.

[0014] Preferably, the end of the steel main beam is embedded in a trapezoidal reinforced concrete abutment, and a pressure-bearing end plate is provided at the end of the embedded section of the steel main beam. One side of the pressure-bearing end plate is connected to the steel main beam by a stiffening rib, and the other side of the pressure-bearing end plate is anchored to the concrete pedestal by an anchor rod.

[0015] Preferably, concrete is poured into the closed box section of the negative bending moment zone of the support according to the force analysis results, and bolt connectors are arranged on the inner side of the steel box girder plate in the area where concrete is poured.

[0016] Preferably, the prefabricated panels are directly laid between the main beams, and in this case the width of the prefabricated panels is 1m-2m so that they can be more closely arranged on the upper edge of the curved steel main beam.

[0017] The present invention also provides a construction method of the steel and concrete composite slab arched composite beam bridge, comprising the following steps:

[0018] S1. Construction of pile foundation and concrete pedestal. During pedestal construction, the embedded section of steel main beam is pre-buried;

[0019] S2. Set up temporary supports and install the steel main beam. The two ends of the steel main beam and the extended part of the embedded section are connected with high-strength bolts or welded on site;

[0020] S3. Steel main beam segments are connected by high-strength bolts or welded on site on temporary supports;

[0021] S4. The corbels extending outward from the webs of the steel secondary beam and the steel main beam are connected by high-strength bolts or welded on site;

[0022] S5. Lay precast concrete slabs between the steel secondary beams;

[0023] S6. Tie the cast-in-place layer steel bars on the surface of the precast slab, and then pour the cast-in-place layer concrete;

[0024] S7. After the concrete reaches the required strength, remove the temporary support;

[0025] S8. Install the bridge deck auxiliary structure.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. Arched composite beam bridges with small curvature are particularly suitable for engineering environments where both sides are mountains or slopes. They are not only beautiful in shape, but also can fully utilize the strength performance advantages of the foundations on both sides;

[0028] 2. The arched composite beam bridge with small curvature cleverly takes advantage of the mechanical performance of the two structural forms of steel-concrete composite beam and steel tube concrete. In the mid-span positive bending moment area, the advantages of the composite beam are fully utilized to resist the positive bending moment. In addition, concrete is not poured inside the steel box beam, which minimizes the deadweight of the structure. In the negative bending moment area of ​​the support, the advantages of the steel tube concrete component are fully utilized to resist the axial force and part of the negative bending moment. The rigidity and bearing capacity of the cross section are maximized by pouring concrete into the steel box beam, which can also effectively reduce the amount of steel used in the structure.

[0029] 3. The bridge deck is in the form of a composite slab, which can be constructed without formwork. The laying of precast slabs is fast and convenient, which shortens the construction period to the greatest extent and avoids the impact of construction on the lower traffic. In particular, the precast slabs are laid between the secondary beams, which can solve the problem of loose fitting of the precast slabs due to the arc-shaped upper edge of the arched steel main beam;

[0030] 4. In summary, this structural form is particularly suitable for bridge structures with a span of 50-200m. It can maximize the advantages of the combined structure, not only has a good landscape effect, but also can effectively reduce the project cost and shorten the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the specific implementation methods of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0032] Figure 1 It is a schematic diagram of the overall structure of the steel and concrete composite slab arched composite beam bridge described in the present invention.

[0033] Figure 2 It is a schematic diagram of the cross section of the steel main beam in the positive bending moment zone at the mid-span.

[0034] Figure 3 It is a schematic diagram of the cross section of the steel main beam in the negative bending moment area of ​​the support.

[0035] Figure 4 It is a schematic diagram of the structure of the embedded section of the steel main beam.

[0036] Figure 5 It is a schematic diagram of the layout of steel main beams, steel secondary beams and bridge decks. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0038] like Figures 1 to 5 As shown, the steel and concrete composite slab arch composite beam bridge described in the present invention includes an embedded abutment, a flat arch 31 and a bridge deck 32, the embedded abutment includes an abutment pile foundation 1 and a concrete pedestal 2, the flat arch 31 includes a steel main beam 3 and a steel secondary beam 4, the concrete pedestal 2 includes a trapezoidal reinforced concrete abutment 201 and an embedded section 202 of the steel main beam, and the abutment pile foundation is cast below the trapezoidal reinforced concrete abutment; the steel main beam 3 is arranged along the span direction of the bridge ("longitudinal"); the steel main beams are connected by steel secondary beams; the bridge deck 32 adopts the structure of a reinforced concrete composite slab, which is a combined force-bearing whole formed by a precast slab and a cast-in-place layer, and the precast slab is generally laid between the steel secondary beams.

[0039] Preferably, the steel main beam 3 generally adopts a flat arch shape with a small curvature and a span ratio between 1 / 20 and 1 / 12.

[0040] Preferably, the steel secondary beam generally adopts an I-shaped section, and a bolt connector is arranged on the upper edge of the steel secondary beam to be combined with the reinforced concrete composite slab.

[0041] Preferably, the steel main beams are arranged in a "few main beam" form, that is, the spacing in the direction perpendicular to the bridge span ("transverse") is generally more than 10m. For bridges with a small deck width, generally only two or three steel main beams are used.

[0042] In a preferred embodiment, the steel main beam adopts a cross-section form combining open and closed sections, and an open box section ( Figure 2 An open steel box 34 is shown. In the negative moment area of ​​the support, a closed box section ( Figure 3A closed steel box 35 is shown; in particular, an ordinary bolt connector 33 is arranged at the upper edge of the open box section, and a pull-out but non-shear connector 36 is arranged at the upper edge of the closed box section according to the force analysis results, if the top plate is under tension, and an ordinary bolt connector is arranged if the top plate is not under tension.

[0043] In a preferred embodiment, the end of the steel main beam is embedded in the trapezoidal reinforced concrete abutment 201. In particular, a pressure-bearing end plate 311 is provided at the end of the embedded section of the steel main beam. One side of the pressure-bearing end plate 311 is connected to the steel main beam by a stiffening rib 312, and the other side of the pressure-bearing end plate 311 is anchored to the concrete pedestal by an anchor rod 313.

[0044] Preferably, the outer surface of the steel main beam of the embedded section is entirely welded with bolt connectors.

[0045] Preferably, according to the force analysis results, concrete 37 is poured in the area with larger axial force in the closed box section of the support negative bending moment area, and bolt connectors are arranged on the inner side of the steel box girder plate in the area where concrete is poured.

[0046] Preferably, when the spacing between steel main beams is relatively dense, the prefabricated panels can also be directly laid between the main beams. In this case, the width of the prefabricated panels is generally 1-2m so that they can be more closely arranged on the upper edge of the curved steel main beams.

[0047] The force transmission path of the steel and concrete composite slab arched composite beam bridge of the present invention is:

[0048] (1) The concrete composite slab bridge deck and the steel secondary beam form a transverse composite beam force transmission system, which transfers the load of the bridge deck to the steel main beam;

[0049] (2) The steel main beam and the concrete composite slab bridge deck form a composite arch beam force transmission system, which transfers the upper load to the embedded section of the steel main beam;

[0050] (3) The embedded steel main beam transfers all loads to the reinforced concrete abutment through the pressure-bearing end plate and the bolts on the outer wall of the steel tube, and then to the lower pile foundation and surrounding soil.

[0051] The present invention also provides a construction method of the steel and concrete composite slab arched composite beam bridge, comprising the following steps:

[0052] S1. Construction of pile foundation and concrete pedestal. During pedestal construction, the embedded section of steel main beam is pre-buried;

[0053] S2. Set up temporary supports and install the steel main beam. The two ends of the steel main beam and the extended part of the embedded section are connected with high-strength bolts or welded on site;

[0054] S3. Steel main beam segments are connected by high-strength bolts or welded on site on temporary supports;

[0055] S4. The corbels extending outward from the webs of the steel secondary beam and the steel main beam are connected by high-strength bolts or welded on site;

[0056] S5. Lay precast concrete slabs between the steel secondary beams;

[0057] S6. Tie the cast-in-place layer steel bars on the surface of the precast slab, and then pour the cast-in-place layer concrete;

[0058] S7. After the concrete reaches the required strength, remove the temporary support;

[0059] S8. Install the bridge deck auxiliary structure.

[0060] The above describes the preferred embodiments of the present invention, but it is not intended to limit the present invention. Those skilled in the art may make improvements and changes to the embodiments disclosed herein without departing from the scope and spirit of the present invention.

Claims

1. A steel and concrete composite slab arched composite beam bridge, characterized in that: The steel and concrete composite slab arch composite beam bridge includes an embedded abutment, a flat arch and a bridge deck. The embedded abutment includes an abutment pile foundation and a concrete pedestal. The flat arch includes a steel main beam and a steel secondary beam. The concrete pedestal includes a trapezoidal reinforced concrete abutment and an embedded section of the steel main beam. The abutment pile foundation is cast below the trapezoidal reinforced concrete abutment. The steel main beams are arranged along the span direction of the bridge. The steel main beams are connected by steel secondary beams. The bridge deck adopts a reinforced concrete composite slab structure, which is a combined force-bearing whole formed by a precast slab and a cast-in-place layer, and the precast slabs are laid between the steel secondary beams.

2. The steel and concrete composite slab arched composite beam bridge according to claim 1, characterized in that: The steel main beam adopts a small curvature flat arch shape with a rise-span ratio between 1 / 20 and 1 / 12.

3. The steel and concrete composite slab arched composite beam bridge according to claim 1, characterized in that: The steel secondary beam adopts an I-shaped section, and a bolt connector is arranged on the upper edge of the steel secondary beam to be combined with the reinforced concrete composite slab.

4. The steel and concrete composite slab arched composite beam bridge according to claim 1, characterized in that: The steel main beams are arranged in a "few main beam" form, that is, the spacing perpendicular to the span direction of the bridge is more than 10m.

5. The steel and concrete composite slab arched composite beam bridge according to claim 1, characterized in that: The steel main beam adopts a cross-section form that combines open and closed sections. An open box section is adopted in the mid-span positive bending moment area, and a closed box section is adopted in the support negative bending moment area.

6. The steel and concrete composite slab arched composite beam bridge according to claim 5, characterized in that: The upper edge of the open box section is arranged with a common bolt connector.

7. The steel and concrete composite slab arched composite beam bridge according to claim 5, characterized in that: The upper edge of the closed box section is arranged according to the force analysis results. If the top plate is under tension, a pull-out but not shear-resistant connector is arranged. If the top plate is not under tension, an ordinary bolt connector is arranged.

8. The steel and concrete composite slab arched composite beam bridge according to claim 1, characterized in that: The end of the steel main beam is embedded in the trapezoidal reinforced concrete abutment, and a pressure-bearing end plate is arranged at the end of the embedded section of the steel main beam. One side of the pressure-bearing end plate is connected to the steel main beam by a stiffening rib, and the other side of the pressure-bearing end plate is anchored to the concrete pedestal by an anchor rod.

9. The steel and concrete composite slab arched composite beam bridge according to claim 5, characterized in that: Concrete is poured into the closed box section in the negative bending moment area of ​​the support according to the force analysis results, and bolt connectors are arranged on the inner side of the steel box girder plate in the area where concrete is poured.

10. The steel and concrete composite slab arched composite beam bridge according to claim 1, characterized in that: The prefabricated panels are directly laid between the main beams. At this time, the width of the prefabricated panels is 1m-2m, so that they can be arranged more closely on the upper edge of the curved steel main beam.

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