Large-span corrugated steel web continuous beam structure suitable for segment assembly

Abstract

The utility model discloses a large-span corrugated steel web continuous beam structure suitable for section assembly, which comprises a middle cross beam and a main beam section, and the middle cross beam comprises a middle cross beam top plate, a middle cross beam bottom plate and a steel box; each main beam section comprises a main beam top plate, a main beam bottom plate and a plurality of corrugated steel webs; the middle cross beam top plate and the middle cross beam bottom plate are concrete plates; a plurality of shear nails are uniformly distributed on the outer surfaces of a steel box top plate and a steel box bottom plate of the steel box, and a plurality of longitudinal horizontal stiffening ribs are arranged on the outer surfaces of flat steel webs connected with the main beam sections in the height direction; horizontal stiffening ribs corresponding to the longitudinal horizontal stiffening ribs are arranged on the inner side surface of the flat steel web; and each longitudinal horizontal stiffening rib extends to be connected with all the corrugated steel webs on the corresponding side. During construction, the middle cross beam top plate and the middle cross beam bottom plate are poured twice, and a pouring hole and an air outlet hole are additionally formed in the steel box bottom plate. The corrugated steel web continuous beam is simpler in structure, more convenient to construct, lighter in section and better in durability.

Description

Technical Field

[0001] The utility model relates to the technical field of continuous beam construction, in particular to a large-span corrugated steel web continuous beam structure suitable for segment assembly. Background Art

[0002] In recent years, continuous bridges with corrugated steel webs have gradually shown greater advantages than concrete continuous beam bridges in terms of stress performance, durability, material saving and carbon reduction, and landscape effects. At the same time, with the continuous development of prefabrication technology and construction and erection equipment, bridge construction technology is constantly moving towards factory-based, assembled, and standardized directions, providing a good foundation for the segmental prefabrication and assembly of large-span continuous beam bridges with corrugated steel webs.

[0003] The negative bending moment section at the top of the middle pier of a large-span continuous beam bridge with corrugated steel webs is usually composed of a solid beam section at the top of the pier and box beam sections with corrugated steel webs on both sides. Among them, the cross beam section at the top of the pier usually adopts a concrete solid cross beam, and the corrugated steel web of the box beam section adjacent to the cross beam section with a higher beam height and larger web shear force is lined with concrete. The structure of the lined concrete can, on the one hand, achieve a uniform transition of the structural stiffness between the corrugated steel web section of the steel structure and the concrete solid cross beam section, and on the other hand, while sharing the cross section shear force with the corrugated steel web, it can also prevent the buckling instability of the corrugated steel web in the beam section with a higher corrugated steel web and larger shear force near the cross beam area.

[0004] Large-span continuous beam bridges with corrugated steel webs are mostly constructed by cantilever casting. In recent years, with the development of prefabrication and assembly technology, a small number of projects have begun to adopt cantilever assembly technology. However, with the increase of bridge span, the structural size of the solid beam section at the top of the middle pier increases, the weight of the beam is heavy, and the lining concrete set on the adjacent beam sections on both sides further increases the total weight of the top of the middle pier and the adjacent sections, which brings great difficulties to the prefabrication and assembly of the pier top section and the adjacent sections. The construction of lining concrete also increases the construction process and construction difficulty to a certain extent. At the same time, since the web of the box beam of the lined concrete section is composed of two materials, steel structure and concrete, and the elastic modulus of the two materials is different, under the same load and strain, the corrugated steel web is far from reaching the design strength, while the lining concrete has reached the tensile stress limit and cracks, which affects the safety and durability of the corrugated steel web.

[0005] Therefore, how to make the structure of the corrugated steel web continuous beam simpler, the construction more convenient, the segments lighter, the durability better, and more suitable for the segment prefabrication and assembly construction of large-span corrugated steel web beams while ensuring the excellent stress-bearing performance of the structure has become a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0006] In view of the above-mentioned defects of the prior art, the utility model provides a large-span corrugated steel web continuous beam structure suitable for segment assembly. The purpose is to make the structure of the corrugated steel web continuous beam simpler, the construction more convenient, the segments lighter, the durability better, and more suitable for the segment prefabrication and assembly construction of large-span corrugated steel web beams on the basis of ensuring the excellent stress-bearing performance of the structure.

[0007] To achieve the above purpose, the utility model discloses a large-span corrugated steel web continuous beam structure suitable for segment assembly, including a middle cross beam arranged on the top of the bridge support and main beam segments arranged on both sides of the middle cross beam.

[0008] Wherein, the middle cross beam is a steel-concrete combined structure, including a middle cross beam top plate and a middle cross beam bottom plate, and a steel box arranged between the middle cross beam top plate and the middle cross beam bottom plate to form a double overlap with the middle cross beam top plate and the middle cross beam bottom plate;

[0009] Each of the main beam segments is a corrugated steel web beam segment, including a main beam top plate integrally cast with the middle cross beam top plate, a main beam bottom plate integrally cast with the middle cross beam bottom plate, and a plurality of corrugated steel webs arranged between the main beam top plate and the main beam bottom plate;

[0010] The top plate of the middle cross beam and the bottom plate of the middle cross beam are both concrete slabs;

[0011] A plurality of shear nails are arranged on the outer surfaces of the steel box top plate where the steel box is connected to the middle cross beam top plate, and the steel box bottom plate where the steel box is connected to the middle cross beam bottom plate, and a plurality of longitudinal horizontal stiffening ribs are arranged on the outer surfaces of the flat steel web plate connected to each main beam segment along the height direction;

[0012] The inner side surface of the flat steel web is provided with a horizontal stiffening rib corresponding to each of the longitudinal horizontal stiffening ribs;

[0013] A support stiffening rib is provided on the inner side of the bottom plate of the steel box where the steel box is connected to the bottom plate;

[0014] Each of the longitudinal horizontal stiffening ribs is extended to be connected with all the corrugated steel webs on the corresponding side.

[0015] Preferably, a plurality of shear nails arranged in a rectangular array are arranged on the top plate, the bottom plate and the surface where they meet the steel box;

[0016] In each of the shear nails uniformly distributed in a rectangular array, 1 to 2 circles of shear nails close to the outermost sides are provided with elastic rubber sleeves.

[0017] Preferably, a supporting diaphragm is provided inside the steel box at a centerline position corresponding to each of the bridge bearings.

[0018] Preferably, each of the longitudinal horizontal stiffening ribs or the suspended side of each of the horizontal stiffening ribs is provided with a vertically arranged wing plate.

[0019] Preferably, each main beam bottom plate is provided with a drainage hole.

[0020] Beneficial effects of the utility model:

[0021] On the basis of ensuring the excellent stress-bearing performance of the structure, the utility model makes the structure of the corrugated steel web continuous beam simpler, the construction more convenient, the segments lighter, the durability better, and is more suitable for the segment prefabrication and assembly construction of large-span corrugated steel web beams.

[0022] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A structural schematic diagram of an embodiment of the utility model is shown.

[0024] Figure 2 A schematic structural diagram showing a steel box top plate or a steel box bottom plate provided with shear nails in one embodiment of the utility model is shown.

[0025] Figure 3 A structural schematic diagram of the cross section of a middle beam in an embodiment of the utility model is shown.

[0026] Figure 4 A schematic diagram showing the structure of the cross beam corresponding to the outer side of the bridge in one embodiment of the utility model

[0027] Figure 5 Show the utility model Figure 3 Schematic diagram of the AA section structure.

[0028] Figure 6 A schematic structural diagram showing the connection between the longitudinal horizontal stiffening ribs and the corrugated steel web in one embodiment of the utility model is shown.

[0029] Figure 7 A schematic diagram of the three-dimensional structure of one side of a steel box provided with longitudinal horizontal stiffening ribs in one embodiment of the utility model is shown.

[0030] Figure 8 A schematic diagram of the three-dimensional structure of the inner side of a steel box in one embodiment of the utility model is shown. DETAILED DESCRIPTION

[0031] Example

[0032] like Figures 1 to 8As shown, a large-span corrugated steel web continuous beam structure suitable for segment assembly includes a middle cross beam 1 arranged on the top of a bridge support 9 and main beam segments 2 arranged on both sides of the middle cross beam 1.

[0033] The middle cross beam 1 is a steel-concrete composite structure, including a middle cross beam top plate 11 and a middle cross beam bottom plate 12, and a steel box 3 arranged between the middle cross beam top plate 11 and the middle cross beam bottom plate 12 to form a double overlap with the middle cross beam top plate 11 and the middle cross beam bottom plate 12;

[0034] Each main beam segment 2 is a corrugated steel web beam segment, including a main beam top plate 21 integrally cast with the middle cross beam top plate 11, a main beam bottom plate 22 integrally cast with the middle cross beam bottom plate 12, and a plurality of corrugated steel webs 23 arranged between the main beam top plate and the main beam bottom plate 22;

[0035] The middle cross beam top plate 11 and the middle cross beam bottom plate 12 are both concrete plates;

[0036] A plurality of shear nails 4 are arranged on the outer surfaces of the steel box top plate 31 where the steel box 3 is connected to the middle cross beam top plate 11, and the steel box bottom plate 32 where the steel box 3 is connected to the middle cross beam bottom plate 12, and a plurality of longitudinal horizontal stiffening ribs 34 are arranged on the outer surfaces of the flat steel web plate 33 connected to each main beam segment 2 along the height direction;

[0037] The inner side surface of the flat steel web 33 is provided with a horizontal stiffening rib 34 corresponding to each longitudinal horizontal stiffening rib 5;

[0038] The inner side of the steel box bottom plate 32 where the steel box 3 is connected to the bottom plate is provided with a support stiffening rib 35;

[0039] Each longitudinal horizontal stiffening rib 5 is extended to be connected with all the corrugated steel webs 23 on the corresponding side.

[0040] The utility model adopts a steel-concrete combined structure as the middle cross beam 1 arranged on the top of the bridge support 9, and forms the middle cross beam 1 of the steel-concrete combined structure by forming a double-laminated steel box 3 with the top plate and the bottom plate.

[0041] Among them, the top plate and the bottom plate are both concrete plates, which maintain consistency and continuity with each adjacent main beam segment 2 in terms of structural form;

[0042] At the same time, a steel box 3 is provided between the top plate and the bottom plate of the middle cross beam 1, which effectively reduces the weight of the middle cross beam 1 and is more convenient for prefabrication and on-site installation.

[0043] The utility model provides longitudinal horizontal stiffening ribs 5 extending and covering each corrugated steel web 23 outside the steel box 3 of the middle cross beam 1, and provides horizontal stiffening ribs 34 inside the steel box 3 at positions corresponding to each longitudinal horizontal stiffening rib 5, so that the connection between the steel box 3 and the main beam segment 2 does not need to be lined with concrete as in the prior art;

[0044] Moreover, the longitudinal horizontal stiffening ribs 5 can also ensure the local and overall stability of the corrugated steel web 23 at a higher height, and can be processed and manufactured synchronously with the corrugated steel web 23 in a steel structure factory;

[0045] The utility model can effectively simplify the construction process in the prefabrication site and reduce the weight of the segment by eliminating the lining concrete arranged at the middle cross beam 1 and the connection with the main beam segment 2 in the prior art.

[0046] In practical applications, a plurality of shear studs 4 arranged in a rectangular array are arranged on each side where the top plate, the bottom plate and the steel box 3 meet;

[0047] In each rectangular array of uniformly distributed shear nails 4 , one to two circles of shear nails 4 close to the outermost sides are provided with elastic rubber sleeves 41 .

[0048] In practical applications, in order to solve the problem that all the shear studs 4 in the outermost circle of the shear studs 4 arranged in each rectangular array have large deformation and concentrated stress, elastic rubber sleeves 41 are provided on all the shear studs 4 in the outermost circle to isolate them from the surrounding concrete, so that the force on the shear studs 4 in each rectangular array is more uniform.

[0049] Inside the steel box 3 , a supporting diaphragm 36 is provided at the center line position of each bridge support 9 .

[0050] In some embodiments, a vertically arranged wing plate 6 is provided on the suspended side of each longitudinal horizontal stiffening rib 5 or each horizontal stiffening rib 34 .

[0051] In some embodiments, each main beam bottom plate 22 is provided with a drainage hole 7 .

[0052] The utility model also provides a construction method for a large-span corrugated steel web continuous beam structure suitable for segment assembly, in which the middle cross beam top plate 11 and the middle cross beam bottom plate 12 of the middle cross beam 1 are cast twice, and the concrete pouring process of the middle cross beam bottom plate 12 should ensure that the concrete in special areas such as the chamfer of the beam section is poured densely, and casting holes and air outlet holes are added to the steel box bottom plate 32.

[0053] In some embodiments, the steel box 3 is hoisted to the top of the pier by a floating crane, a steel pier is set on the pier as a bridge support 9 to support the steel box 3, and four three-way jacks are set on the pier top to adjust the axis and elevation data of the steel box 3.

[0054] In some embodiments, the concrete of the center cross beam top plate 11 and the center cross beam bottom plate 12 should have good workability.

[0055] In certain embodiments, the concrete is a self-compacting concrete.

[0056] In some embodiments, steel fibers are added to the concrete, coarse aggregate uses continuously graded crushed stone with a size of 5 mm to 20 mm, the maximum particle size should not exceed 25 mm, and the timely supply of concrete is ensured during the pouring process.

[0057] Based on the traditional corrugated steel web continuous beam bridge, the utility model adopts a steel-concrete combined middle cross beam 1 on the pier top, which has superior structural performance, better durability, simpler structure, more convenient construction, greatly reduces the weight of the pier top segment, and can solve the problem that the traditional pier top segment is too heavy and cannot be prefabricated and hoisted as a whole.

[0058] In particular, when the middle cross beam 1 of the middle pier of the bridge has a long section and a large overall lifting weight, and it is difficult to prefabricate and install the section as a whole, the middle cross beam bottom plate 12 made of structural concrete and the middle cross beam steel structure can be prefabricated and installed in place, and the middle cross beam top plate 11 concrete is poured on site. The steel box top plate 31 of the steel box 3 of the middle cross beam 1 can also serve as the bottom formwork for pouring concrete on the middle cross beam top plate 11.

[0059] The partially prefabricated and partially cast-in-place construction method of the utility model can greatly reduce the construction difficulty of on-site installation and operation and improve the construction efficiency.

[0060] For the higher corrugated steel web 23, the lining concrete between the center cross beam 1 and the main beam segment 2 is cancelled, and a number of longitudinal horizontal stiffening ribs 5 are arranged along the beam height to stiffen the corrugated steel web 23 according to the force, and a rigidity structural transition is made with the steel box 3 of the center cross beam 1 to ensure its own shear resistance and buckling stability, and ensure effective combination with the center cross beam 1 and reasonable force transmission performance.

[0061] Since the lining concrete between the middle cross beam 1 and the main beam segment 2 is cancelled, the segment construction is facilitated, the segment weight is reduced, and the problem of easy cracking and falling off of the lining concrete at the corrugated steel web 23 in the prior art is fundamentally solved, thereby improving the reliability and durability of the entire structure.

[0062] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A long-span corrugated steel web continuous beam structure suitable for segmental assembly, comprising a middle cross beam (1) arranged on the top of a bridge support (9), and main beam segments (2) arranged on both sides of the middle cross beam (1); characterized in that: The middle cross beam (1) is a steel-concrete composite structure, comprising a middle cross beam top plate (11) and a middle cross beam bottom plate (12), and a steel box (3) arranged between the middle cross beam top plate (11) and the middle cross beam bottom plate (12) to form a double overlap with the middle cross beam top plate (11) and the middle cross beam bottom plate (12); Each of the main beam segments (2) is a corrugated steel web beam segment, comprising a main beam top plate (21) integrally cast with the middle cross beam top plate (11), a main beam bottom plate (22) integrally cast with the middle cross beam bottom plate (12), and a plurality of corrugated steel webs (23) arranged between the main beam top plate and the main beam bottom plate (22); The middle cross beam top plate (11) and the middle cross beam bottom plate (12) are both concrete plates; A plurality of shear nails (4) are arranged on the outer surfaces of the steel box top plate (31) where the steel box (3) is connected to the middle cross beam top plate (11), and the steel box bottom plate (32) where the steel box (3) is connected to the middle cross beam bottom plate (12), and a plurality of longitudinal horizontal stiffening ribs (5) are arranged on the outer surface of the flat steel web plate (33) connected to each main beam segment (2) along the height direction; The inner side surface of the flat steel web (33) is provided with a horizontal stiffening rib (34) corresponding to each of the longitudinal horizontal stiffening ribs (5); A support stiffening rib (35) is provided on the inner side of the steel box bottom plate (32) where the steel box (3) is connected to the bottom plate; Each of the longitudinal horizontal stiffening ribs (5) is extended to be connected to all the corrugated steel webs (23) on the corresponding side.

2. The large-span corrugated steel web continuous beam structure suitable for segment assembly according to claim 1 is characterized in that: A plurality of shear nails (4) arranged in a rectangular array are arranged on the surface where the top plate and the bottom plate meet the steel box (3); In each of the shearing nails (4) uniformly distributed in a rectangular array, 1 to 2 circles of the shearing nails (4) close to the outermost sides are provided with elastic rubber sleeves (41).

3. The large-span corrugated steel web continuous beam structure suitable for segment assembly according to claim 1 is characterized in that: Inside the steel box (3), a supporting diaphragm (36) is provided corresponding to the centerline position of each bridge support (9).

4. The large-span corrugated steel web continuous beam structure suitable for segment assembly according to claim 1 is characterized in that: A vertically arranged wing plate (6) is provided on one side of each of the longitudinal horizontal stiffening ribs (5) or each of the horizontal stiffening ribs (34) that is suspended.

5. The large-span corrugated steel web continuous beam structure suitable for segment assembly according to claim 1, characterized in that: Each main beam bottom plate (22) is provided with a water drainage hole (7).

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