A continuous rigid frame bridge with a corrugated steel - ultra - high strength powder concrete composite box girder

Abstract

The present invention relates to a corrugated steel-ultra-high-strength powder concrete composite box girder continuous rigid frame bridge, comprising a pier-beam consolidation section and a web beam section, the web beam section is divided into a first web beam section and a second web beam section, the first web beam section, the second web beam section and the pier-beam consolidation section are sequentially connected along the bridge direction, a diaphragm is provided between the first web beam section and the second web beam section, the web beam section comprises a top plate, a double-limb corrugated steel web and a concrete bottom plate arranged sequentially from top to bottom, the bottom of the double-limb corrugated steel web of the second web beam section is filled with pouring concrete, the top plate comprises a corrugated steel plate placed on the double-limb corrugated steel web, and a concrete layer cast by ultra-high-strength powder concrete is provided on the corrugated steel plate. Compared with the prior art, the present invention has the advantages of strong anti-buckling ability and large span.

Description

Technical Field

[0001] The present invention relates to the field of civil engineering bridges, and particularly to a continuous rigid frame bridge with a corrugated steel - ultra - high strength powder concrete composite box girder. Background Art

[0002] A concrete box girder bridge refers to a box girder bridge in which the top and bottom plates and the web are all made of concrete. Due to its excellent bending and torsion resistance performance and outstanding cost - performance ratio, it has become the main bridge type within the range of 50 - 270m. However, engineering practices in recent years have found that after the concrete box girder bridge exceeds 100m, diseases such as web cracking and continuous deflection of the beam body are likely to occur. The reason is that when the span of the beam bridge increases to a certain extent, the self - weight dead load grows too fast, and the shear and tensile strength of the box body is relatively insufficient. The bridge community has a consensus on solving such diseases. One method is to further increase the structural size of the concrete box girder and increase the amount of prestressed tendons and ordinary steel bars. By increasing the structural resistance to cope with the rapidly increasing load, but this practice itself will increase the dead load of the beam body, resulting in a further increase in material consumption. Especially after the span exceeds 200m, the cost - performance ratio of the whole bridge drops sharply, thus losing the competitive advantage over other bridge types. Another method is to improve the box body material and select steel with large bearing capacity and relatively light self - weight to form a composite structure box girder to effectively break through the span of the box girder bridge.

[0003] The corrugated steel web concrete box girder bridge is one of the above - mentioned second methods. In the corrugated steel web concrete box girder bridge, the top and bottom plates are made of concrete, and the web is made of corrugated steel. After replacing the concrete web of the original concrete box girder with a corrugated steel web, not only the self - weight is reduced, but also the problem of web cracking is well solved. Due to its excellent mechanical properties, the corrugated steel web concrete box girder bridge has developed rapidly on domestic highways and municipal bridges, and the span is constantly increasing. However, as the span continues to increase, the height of the web increases accordingly, and the corrugated steel web of the corrugated steel web concrete box girder bridge will buckle. Limited by the buckling safety of the corrugated steel web, its span is difficult to break through 200m. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above - mentioned deficiencies in the prior art and provide a continuous rigid frame bridge with a corrugated steel - ultra - high strength powder concrete composite box girder, which has strong anti - buckling ability and large span.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A continuous rigid frame bridge of a corrugated steel-ultra-high-strength powder concrete composite box girder comprises a pier-beam consolidation section and a web beam section, wherein the web beam section is divided into a first web beam section and a second web beam section, wherein the first web beam section, the second web beam section and the pier-beam consolidation section are sequentially connected along the bridge direction, a transverse partition is arranged between the first web beam section and the second web beam section, wherein the web beam section comprises a top plate, a double-limb corrugated steel web and a concrete bottom plate which are sequentially arranged from top to bottom, wherein the bottom of the double-limb corrugated steel web of the second web beam section is filled with poured concrete, wherein the top plate comprises a corrugated steel plate placed on the double-limb corrugated steel web, wherein a concrete layer cast by ultra-high-strength powder concrete is arranged on the corrugated steel plate.

[0007] A bridge pier is provided below the pier-beam consolidation section to be consolidated therewith. The pier-beam consolidation section adopts a prestressed concrete box beam structure, which is simple in structure and easy to maintain. The top plate of the structure is also cast with ultra-high-strength powder concrete to maintain the smooth connection between the pier-beam consolidation section and the second web beam section.

[0008] The top plate adopts ultra-high-strength powder concrete to reduce the thickness and weight of the top plate while meeting the structural stress requirements. The double-limb corrugated steel web reduces the transverse span of the top plate and the negative bending moment peak of the top plate. The transverse prestressed beam of the top plate can be eliminated to simplify the structure.

[0009] The poured concrete of the second web beam section is the same as the concrete used for the concrete bottom plate, forming a trough-type concrete bottom web. The thickness of the concrete bottom plate in the second web beam section is less than the thickness of the concrete bottom plate in the first web beam section. By reducing the thickness of the concrete bottom plate of the second web beam section and filling the poured concrete between the bottoms of the double-leg corrugated steel webs, the anti-buckling capacity of the double-leg corrugated steel webs is improved without increasing the constant load of the trough-type concrete bottom webs, thereby increasing the span of the rigid frame bridge.

[0010] Furthermore, the corrugated steel plate is connected to the double-limb corrugated steel web by double-sided welding, and a plurality of second perforated plates located in the concrete layer are provided on the corrugated steel plate along the longitudinal bridge direction to achieve the connection between the corrugated steel plate and the concrete layer.

[0011] Furthermore, a first through hole is provided at the bottom of the double-limb corrugated steel web, through steel bars and bottom plate steel bars are provided inside the concrete bottom plate, the double-limb corrugated steel web is inserted into the concrete bottom plate, and the through steel bars pass through the first through hole and are welded to the bottom plate steel bars.

[0012] Furthermore, the bottoms of the two corrugated steel webs of the double-legged corrugated steel webs of the second web beam section are connected by tension bolts passing horizontally through the poured concrete;

[0013] Further, on both of the two corrugated steel webs of the double-limb corrugated steel web of the second web girder segment, a second perforated plate or shear studs embedded in the grouted concrete are provided.

[0014] Further, the cross-sectional thickness of the top plate along the transverse direction of the bridge gradually increases from both ends to the middle. The concrete layer is provided with a duct along the longitudinal direction of the bridge. A prestressed steel bundle is arranged in the duct. An anchoring point is provided at the upper edge of the double-limb corrugated steel web. The end of the prestressed steel bundle is anchored at the anchoring point.

[0015] Further, a first pedestrian through hole for entering the inner cavity of the double-limb corrugated steel web is provided on both the pier-girder consolidation section and the diaphragm. A second pedestrian through hole for entering the inner cavity of the box girder is provided on both the pier-girder consolidation section and the diaphragm. The diaphragm is connected to the double-limb corrugated steel web and the top plate through shear studs. The diaphragm is inserted into the internal part of the concrete bottom plate and is connected to the concrete bottom plate through ordinary steel bars.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention includes a pier-girder consolidation section and a web girder segment. The web girder segment includes a first web girder segment and a second web girder segment. The first web girder segment, the second web girder segment and the pier-girder consolidation section are sequentially connected in the longitudinal direction of the bridge. The height of the double-limb corrugated steel web in the second web girder segment increases with the increase of the span of the rigid frame bridge, and its buckling resistance decreases. The present invention fills grouted concrete between the bottoms of the double-limb corrugated steel webs. The grouted concrete of the second web girder segment and the concrete bottom plate form a trough-shaped concrete bottom web, and the thickness of the concrete bottom plate of the second web girder segment is thinned, so as to improve the buckling resistance of the double-limb corrugated steel web without increasing the dead load of the trough-shaped concrete bottom web, thereby increasing the span of the rigid frame bridge;

[0018] (2) The top plate of the present invention includes a corrugated steel plate placed on the double-limb corrugated steel web. A concrete layer made of ultra-high-strength powder concrete is provided on the corrugated steel plate. The thickness and weight of the top plate are reduced under the condition of meeting the structural force, so that the dead load of the bridge is greatly reduced, thereby increasing the span of the rigid frame bridge.

[0019] (3) The double-limb corrugated steel web of the present invention reduces the transverse span of the top plate and reduces the peak value of the negative moment of the top plate. The transverse prestressed tendons of the top plate can be cancelled, simplifying the structure;

[0020] (4) A first through hole is provided at the bottom of the double-limb corrugated steel web of the present invention. Penetrating steel bars and bottom plate steel bars are provided inside the concrete bottom plate. The double-limb corrugated steel web is inserted into the concrete bottom plate. The penetrating steel bars pass through the first through hole and are welded to the bottom plate steel bars, so that the connection between the concrete bottom plate and the double-limb corrugated steel web is stable;

[0021] (5) The two corrugated steel webs of the double-leg corrugated steel web of the second web beam section of the present invention are connected by tension bolts passing through the poured concrete, thereby improving the anti-buckling capacity of the double-leg corrugated steel web before and after the concrete is poured;

[0022] (6) The bottoms of the two corrugated steel webs of the double-limb corrugated steel web of the present invention are both provided with a second perforated plate or shear nails buried in the poured concrete, which further ensures the stable connection between the poured concrete and the double-limb corrugated steel web, thereby improving the anti-buckling capacity;

[0023] (7) The concrete layer of the top plate of the present invention is provided with a channel along the longitudinal direction of the bridge, a prestressed steel bundle is provided in the channel, an anchor point is provided on the upper edge of the double-limb corrugated steel web, and the end of the prestressed steel bundle is anchored at the anchor point, thereby reducing the shear lag effect and improving safety;

[0024] (8) The pier-beam consolidation section of the present invention adopts a prestressed concrete box beam structure, and a bridge pier is provided below the pier-beam consolidation section to replace the support, which is convenient for maintenance;

[0025] (9) The pier-beam consolidation section and the diaphragm of the present invention are both provided with a first pedestrian through hole for entering the inner cavity of the double-leg corrugated steel web and a second pedestrian through hole for entering the interior of the box beam, which facilitates the construction of pouring concrete and the later maintenance of the double-leg corrugated steel web. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall section of the bridge;

[0027] Figure 2 for Figure 1 AA section diagram in;

[0028] Figure 3 for Figure 1 BB cross-section diagram in;

[0029] Figure 4 It is a schematic elevation diagram of a double-limb corrugated steel web;

[0030] Figure 5 It is a schematic plan view of the double-leg corrugated steel web in the second web beam section;

[0031] Figure 6 for Figure 5 Schematic diagram of CC cross section;

[0032] Figure 7 for Figure 5 DD cross-section diagram in;

[0033] Figure 8 for Figure 7 EE cross-sectional diagram in;

[0034] Figure 9is a schematic diagram of a composite roof;

[0035] 1. First web beam section, 2. Second web beam section, 3. Pier-beam consolidation section, 4. Top plate, 5. Double-leg corrugated steel web, 6. Concrete bottom plate, 7. Diaphragm, 8. Pouring concrete, 9. First pedestrian through hole, 10. Tension bolts, 11. First perforated plate, 12. Pier, 41. Corrugated steel plate, 42. Concrete layer, 43. Second perforated plate, 44. Channel, 45. Anchor point, 51. First through hole, 61. Through steel bar, 62. Bottom plate steel bar, 91. Second pedestrian through hole, 111. Second through hole. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0037] A continuous rigid frame bridge composed of corrugated steel and ultra-high strength powder concrete box beams, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 9 , including a pier-beam consolidation section 3 and a web beam section, the web beam section is divided into a first web beam section 1 and a second web beam section 2, the first web beam section 1, the second web beam section 2 and the pier-beam consolidation section 3 are sequentially connected along the longitudinal direction of the bridge, a transverse diaphragm 7 is arranged between the first web beam section 1 and the second web beam section 2, the web beam section includes a top plate 4, a double-limb corrugated steel web 5 and a concrete bottom plate 6 arranged in sequence from top to bottom, the bottom of the double-limb corrugated steel web 5 of the second web beam section 2 is filled with cast concrete 8, the top plate 4 includes a corrugated steel plate 41 placed on the double-limb corrugated steel web 5, and a concrete layer 42 cast by ultra-high strength powder concrete is provided on the corrugated steel plate 41;

[0038] A bridge pier 12 is provided below the pier-beam consolidation section 3 to be consolidated therewith. The pier-beam consolidation section 3 adopts a prestressed concrete box beam structure, which is easy to maintain. The top plate of the pier-beam consolidation section 3 is also cast with ultra-high-strength powder concrete to maintain the smooth connection between the pier-beam consolidation section 3 and the second web beam section 2.

[0039] By adopting ultra-high-strength powder concrete, the thickness and weight of the top plate 4 are reduced while meeting the structural stress requirements, thereby significantly reducing the constant load of the bridge. The double-limb corrugated steel web 5 reduces the transverse span of the top plate 4 and the negative bending moment peak of the top plate 4. The transverse prestressed tendons of the top plate 4 can be eliminated, thereby simplifying the structure.

[0040] By thinning the thickness of the concrete bottom slab 6 in the second web girder segment 2 and filling the gap between the bottoms of the double - limb corrugated steel webs 5 with cast - in - place concrete 8, which is the same as the concrete used for the concrete bottom slab 6, the cast - in - place concrete 8 and the concrete bottom slab 6 form a trough - shaped concrete bottom web. The thickness of the concrete bottom slab 6 in the second web girder segment 2 is less than that in the first web girder segment 1. By thinning the thickness of the concrete bottom slab 6 in the second web girder segment 2, the buckling resistance of the double - limb corrugated steel web 5 can be improved without increasing the dead load of the trough - shaped concrete bottom web, thereby increasing the span of the rigid - frame bridge.

[0041] As Figure 9 , a plurality of second perforated plates 43 located within the concrete layer 42 are provided along the longitudinal bridge direction on the corrugated steel plate 41 to realize the connection between the corrugated steel plate 41 and the concrete layer 42, and the corrugated steel plate 41 is connected to the double - limb corrugated steel web 5 by double - sided welding;

[0042] As Figure 5 , Figure 6 , Figure 7 and Figure 8 , a first through - hole 51 is provided on the double - limb corrugated steel web 5, and a through - reinforcement 61 and a bottom - slab reinforcement 62 are provided inside the concrete bottom slab 6. The double - limb corrugated steel web 5 is inserted into the concrete bottom slab 6, and the through - reinforcement 61 passes through the first through - hole 51 and is welded to the bottom - slab reinforcement 62;

[0043] The bottoms of the two corrugated steel webs of the double - limb corrugated steel web 5 in the second web girder segment 2 are connected by a tension - bolt 10 passing horizontally through the cast - in - place concrete 8.

[0044] On the bottoms of the two corrugated steel webs of the double - limb corrugated steel web 5 in the second web girder segment 2, first perforated plates 11 buried in the cast - in - place concrete 8 are provided.

[0045] The cross - sectional thickness of the top slab 4 along the transverse bridge direction gradually increases from both ends to the middle. The concrete layer 42 is provided with a longitudinal duct 44, and prestressed steel tendons are arranged in the duct 44. An anchorage point 45 is provided at the upper edge of the double - limb corrugated steel web 5, and the ends of the prestressed steel tendons are anchored at the anchorage point 45 to reduce the shear lag effect.

[0046] The distance between the two corrugated steel webs of the double - limb corrugated steel web 5 is not less than 0.8 m. On both the pier - girder consolidation section 3 and the diaphragm 7, a first pedestrian through - hole 9 with a width of 0.6 m along the transverse bridge direction for entering the inner cavity of the double - limb corrugated steel web 5 is provided. On the pier - girder consolidation section 3 and the diaphragm 7, a second pedestrian through - hole 91 for entering the inside of the box girder is also provided. The first pedestrian through - hole 9 and the second pedestrian through - hole 91 are helpful for the staff to enter the inner cavity of the double - limb corrugated steel web 5 for the construction of the cast - in - place concrete 8 and the later maintenance of the double - limb corrugated steel web 5.

[0047] The diaphragm 7 is connected to the double - limb corrugated steel web 5 and the top plate 4 through shear studs. The diaphragm 7 is inserted into the interior of the concrete bottom plate 6 and connected by ordinary steel bars.

[0048] Embodiment 2

[0049] In this embodiment, shear studs buried in the grouted concrete 8 are provided at the bottoms of the two corrugated steel webs of the double - limb corrugated steel web 5 of the second web beam segment 2. The double - limb corrugated steel web 5 is connected to the grouted concrete 8 through shear studs, and the rest is the same as in Embodiment 1.

[0050] Embodiment 1 and Embodiment 2 propose a continuous rigid - frame bridge with a corrugated steel - ultra - high - strength powder concrete composite box girder. By filling grouted concrete 8 between the bottoms of the double - limb corrugated steel webs 5, the grouted concrete 8 is the same as the concrete used for the concrete bottom plate 6. The grouted concrete 8 and the concrete bottom plate 6 form a trough - shaped concrete bottom web. By thinning the thickness of the concrete bottom plate 6 of the second web beam segment 2, the buckling resistance of the double - limb corrugated steel web 5 is improved without increasing the dead load of the trough - shaped concrete bottom web, thereby increasing the span of the rigid - frame bridge;

[0051] At the same time, the top plate 4 includes a corrugated steel plate 41 placed on the double - limb corrugated steel web 5, and a concrete layer 42 made of ultra - high - strength powder concrete is provided on the corrugated steel plate 41. The thickness and weight of the top plate 4 are reduced under the condition of meeting the structural stress, greatly reducing the dead load of the bridge and also helping to increase the span of the rigid - frame bridge.

[0052] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention through logical analysis, reasoning, or limited experiments based on the concept of the present invention on the basis of the existing technology shall fall within the protection scope determined by the claims.

Claims

1. A continuous rigid frame bridge with a corrugated steel - ultra - high - strength powder concrete composite box girder, comprising a pier - girder consolidation section (3) and a web girder section, characterized in that, The web beam section is divided into a first web beam section (1) and a second web beam section (2). The first web beam section (1), the second web beam section (2) and the pier beam consolidation section (3) are connected in sequence along the longitudinal direction of the bridge. A transverse diaphragm (7) is provided between the first web beam section (1) and the second web beam section (2). The web beam section comprises a top plate (4), a double-limb corrugated steel web (5) and a concrete bottom plate (6) which are arranged in sequence from top to bottom. The bottom of the double-limb corrugated steel web (5) of the second web beam section (2) is filled with cast concrete (8). The top plate (4) comprises a corrugated steel plate (41) placed on the double-limb corrugated steel web (5). A concrete layer (42) cast by ultra-high strength powder concrete is provided on the corrugated steel plate (41). The thickness of the concrete bottom plate (6) in the second web beam section (2) is smaller than the thickness of the concrete bottom plate (6) in the first web beam section (1).

2. The continuous rigid frame bridge with a corrugated steel - ultra - high - strength powder concrete composite box girder according to claim 1, characterized in that, A plurality of second perforated plates (43) located in the concrete layer (42) are arranged on the corrugated steel plate (41) along the longitudinal direction of the bridge.

3. The continuous rigid frame bridge with a corrugated steel - ultra - high - strength powder concrete composite box girder according to claim 1, characterized in that, The double-limb corrugated steel web (5) is provided with a first through hole (51), the concrete bottom plate (6) is provided with a through steel bar (61) and a bottom plate steel bar (62), the double-limb corrugated steel web (5) is inserted into the concrete bottom plate (6), and the through steel bar (61) passes through the first through hole (51) and is welded to the bottom plate steel bar (62).

4. The continuous rigid frame bridge with a corrugated steel - ultra - high - strength powder concrete composite box girder according to claim 1, characterized in that, The bottoms of the two corrugated steel webs of the double-legged corrugated steel webs (5) of the second web beam section (2) are connected by tension bolts (10) passing through the poured concrete (8).

5. The continuous rigid frame bridge with a corrugated steel - ultra - high - strength powder concrete composite box girder according to claim 1, characterized in that, The bottoms of the two corrugated steel webs of the double-limb corrugated steel webs (5) of the second web beam section (2) are both provided with a first perforated plate (11) or shear nails buried in the poured concrete (8).

6. The continuous rigid frame bridge with a corrugated steel - ultra - high - strength powder concrete composite box girder according to claim 1, characterized in that, A channel (44) is provided on the concrete layer (42) along the longitudinal direction of the bridge, a prestressed steel bundle is provided in the channel (44), an anchor point (45) is provided on the upper edge of the double-limb corrugated steel web (5), and the end of the prestressed steel bundle is anchored on the anchor point (45).

7. The continuous rigid frame bridge with a corrugated steel - ultra - high - strength powder concrete composite box girder according to claim 1, characterized in that, The pier-beam consolidation section (3) adopts a prestressed concrete box beam structure, and a bridge pier (12) is provided below the pier-beam consolidation section (3) to be consolidated therewith.

8. The continuous rigid frame bridge with a corrugated steel - ultra - high - strength powder concrete composite box girder according to claim 1, characterized in that, The pier-beam consolidation section (3) and the transverse diaphragm (7) are both provided with a first pedestrian through hole (9) for entering the inner cavity of the double-limb corrugated steel web (5).

9. The continuous rigid frame bridge with a corrugated steel - ultra - high - strength powder concrete composite box girder according to claim 1, characterized in that, The pier-beam consolidation section (3) and the transverse partition (7) are both provided with a second pedestrian through hole (91) for entering the inner cavity of the box beam.

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