A structure and construction method of a continuous composite small box girder bridge with corrugated steel webs

Abstract

The invention discloses a novel structure and construction method of a continuous composite small box girder bridge with corrugated steel webs, which relates to the technical field of bridge engineering. The novel structure and construction method of the continuous composite small box girder bridge with corrugated steel webs of the invention include a composite small box girder, a reinforced concrete end cross beam, bridge piers, and bearings. The structure of the invention is novel and ingeniously designed, which can realize convenient prefabrication, transportation and construction of simply supported to continuous beam, achieving the purpose of rapid construction. The use of steel connection plates enables adjacent steel beams to be connected into an integral body to jointly bear forces, effectively solving various problems caused by the discontinuity of the beam ends of steel beams, avoiding problems such as high cost and cumbersome construction caused by tensioning high-strength prestressed tendons and increasing the reinforcement ratio of ordinary steel bars, ensuring the overall mechanical properties and durability of the continuous composite small box girder, and having a high cost performance compared with traditional concrete structures. This device is not only simple in structure but also convenient to operate, bringing better application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and particularly relates to a structure and construction method of a continuous composite small box girder bridge with corrugated steel webs. Background Art

[0002] Simple-supported to continuous beam bridges are widely used in medium and small span bridge engineering, mainly represented by reinforced concrete beams such as T-beams and small box girders. The design methods and construction techniques are already very mature. However, there are always some problems with this structural form: First, the self-weight of reinforced concrete is large, which is not conducive to transportation and hoisting construction; second, the tensile strength of reinforced concrete structures is low, prone to cracking, and prone to durability problems; third, the construction of reinforced concrete beams requires the combination of prestressing technology, and the construction is cumbersome; fourth, as the single-span span increases, the building height of the main beam increases rapidly, so the applicable span is small.

[0003] Therefore, it is necessary to propose a structure and construction method of a continuous composite small box girder bridge with corrugated steel webs to solve the above problems. Summary of the Invention

[0004] The main purpose of the present invention is to provide a structure and construction method of a continuous composite small box girder bridge with corrugated steel webs, which can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A structure and construction method of a continuous composite small box girder bridge with corrugated steel webs, including a composite small box girder, a reinforced concrete end cross beam, a bridge pier, a bearing, a top plate connection steel plate assembly, an end beam assembly, a box connection plate assembly, a stud connector, a web opening connection steel plate, a web truss connector, and a web truss connection bolt. It is characterized in that: the small box girder includes a simply supported trapezoidal steel beam, a concrete bridge deck, and a stud connector. The simply supported trapezoidal steel beam includes a steel flange plate, a corrugated steel web, and a steel bottom plate. The top plate connection steel plate assembly includes a side top plate opening connection steel plate and a middle top plate opening connection steel plate. The end beam assembly includes a beam end steel diaphragm, a beam end steel cross beam, a general diaphragm, and a general transverse connection. The box connection plate assembly includes a box inner bottom plate opening connection steel plate and a box between bottom plate opening connection steel plate. The bearing includes a temporary bearing and a permanent bearing. The stud connector includes a top plate stud, a diaphragm stud, a bottom plate stud, and a web stud.

[0007] Preferably, the interior of the steel beam small box girder is detachably connected to the beam end steel diaphragm, the outer surfaces on both sides of the steel beam small box girder are detachably connected to the beam end steel cross beam. The beam end steel diaphragm and the beam end steel cross beam correspond to each other in the transverse direction of the bridge. The cross section of the beam end steel cross beam is in the shape of an I-beam or an inverted T-beam.

[0008] Preferably, stud connectors are arranged on the inner side of the corrugated steel web at the beam end of the steel cross beam at the beam end. The connecting steel plate with holes in the web is provided with round holes, and the positions of the round holes correspond to the stud connectors on the corrugated steel web at the beam end of the trapezoidal steel beam. The connecting steel plate with holes in the web is installed on the inner sides of the corrugated steel webs at the beam ends of two adjacent simply supported trapezoidal steel beams, and the stud connectors on the inner side of the corrugated steel web pass through the round holes.

[0009] Preferably, round holes are opened in the corrugated steel web at the beam end of the trapezoidal steel beam, and the positions of the round holes correspond to the positions of the main reinforcement bars of the reinforced concrete end cross beam. The main reinforcement bars of the end cross beam penetrate through the round holes in the corrugated steel web at the beam end.

[0010] Preferably, stud connectors are arranged on the inner side of the corrugated steel web at the beam end of the trapezoidal steel beam. The corrugated steel webs at the beam ends of two adjacent trapezoidal steel beams are connected by a truss structure. The truss structure is composed of an upper chord, a lower chord, web members and perforated gusset plates. The upper chord intersects with the web members at the perforated gusset plates, and the lower chord intersects with the web members at the perforated gusset plates. The perforated gusset plates are provided with round holes, and the stud connectors on the inner side of the corrugated steel web at the beam end of the trapezoidal steel beam pass through the round holes in the perforated gusset plates. Angle steel or channel steel or I-shaped steel and other sections are used for the members in the truss structure.

[0011] Preferably, the flange plate of the trapezoidal steel beam is a steel plate, and a closed box is formed by the steel flange plate, the corrugated steel web and the steel bottom plate.

[0012] Preferably, when the main reinforcement bars of the reinforced concrete end cross beam intersect with the connecting steel plate with holes in the web or the perforated gusset plate, the connecting steel plate with holes in the web or the perforated gusset plate is provided with round holes at the positions of the main reinforcement bars of the end cross beam to ensure that the main reinforcement bars of the end cross beam penetrate through.

[0013] Preferably, shear-resistant stirrups are arranged in the reinforced concrete end cross beam. The shear-resistant stirrups are arranged at a certain interval transversely along the bridge. The upper parts of the shear-resistant stirrups extend into the concrete bridge deck in the area between the trapezoidal steel beams, and the shear-resistant stirrups are lower than the connecting steel plate with holes in the top plate at the beam end of the trapezoidal steel beam. Beneficial effects

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The structure of the present invention is novel and ingeniously designed, which can realize convenient prefabrication, transportation and construction of simply supported to continuous beam. The purpose of rapid construction is achieved. The use of steel connecting plates makes adjacent steel beams connected into an integral body to jointly bear force, effectively solves various problems caused by the discontinuity of the beam ends of steel beams, and avoids the problems of high cost and cumbersome construction caused by using tensioned high-strength prestressed tendons and increasing the reinforcement ratio of ordinary steel bars, ensuring the overall mechanical properties and durability of the continuous composite box girder, and having a high cost performance compared with traditional concrete structures. Brief description of the drawings

[0016] Figure 1 Elevation view of the basic connection structure of the present invention

[0017] Figure 2 Cross-sectional view of the basic structure of the present invention

[0018] Figure 3 Schematic diagram of the beam-end cross-section of the first embodiment of the present invention

[0019] Figure 4 Schematic diagram of the beam-end cross-section of the fifth embodiment of the present invention

[0020] Figure 5 Schematic diagram of the connection of the 1 / 2 beam top plate of the present invention

[0021] Figure 6 Schematic diagram of the connection of the 1 / 2 beam bottom plate of the present invention

[0022] Figure 7 Schematic diagram of the web connection of the second embodiment of the present invention

[0023] Figure 8 Schematic diagram of the web connection of the third embodiment of the present invention

[0024] Figure 9 Schematic diagram of the web connection of the fourth embodiment of the present invention

[0025] In the figure: 1, concrete bridge deck; 2, steel flange plate; 3, corrugated steel web; 4, steel bottom plate; 5-1, side top plate opening connecting steel plate; 5-2, middle top plate opening connecting steel plate; 6-1, beam-end steel diaphragm; 6-2, beam-end steel cross beam; 6-3, general diaphragm; 6-4, general transverse connection; 7-1, box inner bottom plate opening connecting steel plate; 7-2, box-intermediate bottom plate opening connecting steel plate; 8-1, temporary support; 8-2, permanent support; 9-1, top plate stud; 9-2, diaphragm stud; 9-3, bottom plate stud; 9-4, web stud; 10, web opening connecting steel plate; 11, web truss connector; 12, web truss connection bolt Detailed implementation manners

[0026] To make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners

[0027] In the first embodiment of the present invention, as Figure 1 , 2As shown in Figures 3, 5, and 6, there are at least two composite small box girders in the transverse direction of the bridge. Among them, the corrugated steel webs 3 of the steel box girder are symmetrically installed on both sides of the steel bottom plate 4, the flange plates 2 are installed on the top of the corrugated steel webs 3, stud connectors 9-1 are arranged on the upper surface of the flange plates 2, and the concrete bridge deck 1 is placed on the upper part of the flange plates 2 of the trapezoidal steel girders to form composite small box girders. Steel transverse diaphragms 6-1 are arranged inside the trapezoidal steel girders at the beam ends, and steel cross beams 6-2 are arranged between the boxes. The steel transverse diaphragms 6-1 and the steel cross beams 6-2 correspond to each other in the transverse direction of the bridge.

[0028] The top plate opening connecting steel plate 5 is connected to the stud 9-1 on the flange plate 2 of the steel girder through the round hole of the steel plate, and the bottom plate opening connecting steel plate 7 is connected to the bottom plate stud 9-3 on the steel bottom plate 4 at the beam end of the trapezoidal steel girder through the round hole of the steel plate.

[0029] Round holes are opened in the corrugated steel webs 3 at the beam ends of the trapezoidal steel girders, and the main reinforcement bars of the reinforced concrete end cross beam penetrate through the round holes. At the same time, the web opening connecting steel plate 10 opens round holes at the position of the main reinforcement bars of the end cross beam to ensure the penetration of the main reinforcement bars of the end cross beam. The shear-resistant stirrups of the reinforced concrete end cross beam are arranged at a certain interval in the transverse direction of the bridge. The upper part of the shear-resistant stirrups extends into the concrete bridge deck 1 between the trapezoidal steel girders and is lower than the top plate opening connecting steel plate 5 at the beam end position of the trapezoidal steel girders.

[0030] The permanent bearing seat 8-2 is located below the intersection of the plane where the center line of each trapezoidal steel girder is located and the plane where the center line of the reinforced concrete end cross beam is located.

[0031] As Figures 1 - 9 shown, a corrugated steel web continuous composite small box girder bridge structure and construction method, the construction method includes the following steps:

[0032] S1. Processing and manufacturing of trapezoidal steel girders: First, perform pre-treatments such as rolling flat, shot blasting or borax rust removal, and applying anti-rust primer to the steel materials that have passed the re-inspection. Secondly, lay out and mark the main components such as the top plate, bottom plate, web, transverse diaphragm, cross beam, plate unit stiffeners, and splicing plates according to the requirements of the processing drawings and processing and manufacturing process documents. Then, preferably use precision cutting or plasma cutting to cut the main components and correct the dimensional deviations of the components. After that, weld and assemble the stiffener plate units and the overall steel girders on a stable and reliable jig in the order of "first local then overall". Finally, perform surface treatment and painting on the surface of the overall steel girders;

[0033] S2. Processing and manufacturing of components such as opening connecting steel plates: Cut the plate parts according to the design drawing dimensions in the same way as S1. After straightening and leveling the plate parts, drill holes to obtain connecting parts such as the top plate opening steel connecting plate, bottom plate opening steel connecting plate, and web connecting plate;

[0034] S3. Bearing Installation: Clean the positions of the temporary and permanent bearings on the piers and abutments, and level them with cement mortar to make their design elevations meet the requirements. Then, mark the center line of the bearing positions according to the design drawings, and finally install the temporary and permanent bearings.

[0035] S4. Installation of Simply Supported Trapezoidal Steel Girders and Crossbeams: Hoist the steel girders hole by hole on the site onto the temporary bearings to form a simply supported state, and then install the crossbeams between the boxes to connect the steel girders of the same span in the transverse direction of the bridge.

[0036] S5. Installation of End Crossbeam Steel Bars, Formworks and Embedded Parts: Install the connecting steel plates with holes on the bottom plates at the adjacent beam ends of the two-span steel girders. Pass the main bars and erection bars of the crossbeam through the reserved holes in the web plates, arrange the shear stirrups of the end crossbeam at intervals, and tie the main bars, erection bars and stirrups firmly to form the steel bar framework of the end crossbeam. Finally, install the steel connecting plates with holes on the top plates and erect the formworks in the areas not covered by the end crossbeam connecting plates.

[0037] S6. Pouring and Curing of End Crossbeam Concrete: Pour the concrete of the end crossbeam and vibrate it thoroughly. After the concrete sets, cover it with plastic film and sprinkle water for curing. Remove the formworks after the crossbeam reaches the design strength.

[0038] S7. Construction of Bridge Deck: Spray the interface connecting agent on the upper part of the steel flange plates and the steel connecting plates with holes on the top plates, and pour the concrete bridge deck.

[0039] S8. Removal of Temporary Bearings: After the bridge deck reaches the design strength, remove the temporary bearings.

[0040] S9. Construction of Bridge Deck Pavement: Continuously pave and compact with high-quality asphalt binder. Embodiment

[0041] In the second embodiment of the present invention, as Figure 7 shown, the main difference from the first embodiment is that web connectors are added and installed on the inner sides of the beam ends of the corrugated steel webs 3 of two adjacent simply supported trapezoidal steel girders through the web connecting steel plates 10 with holes, and are connected to the upper web studs 9-4 on the corrugated steel webs 3 at the beam ends of the trapezoidal steel girders through the round holes in the steel plates. Embodiment

[0042] In the third embodiment of the present invention, as Figure 8 shown, the main difference from the second embodiment is that the corrugated steel webs 3 at the beam ends of two adjacent trapezoidal steel girders are connected through a truss structure 11. The truss structure is composed of upper chords, lower chords, web members and perforated gusset plates by welding. The perforated gusset plates are connected to the inner web studs 9-4 on the corrugated steel webs 3 at the beam ends of the trapezoidal steel girders through the round holes in the perforated gusset plates. The members in the truss structure are made of section steels such as angle steels, channel steels or I-beams. Embodiment

[0043] In the fourth embodiment of the present invention, as Figure 9As shown, the main difference from the third embodiment is that the corrugated steel webs 3 at the ends of two adjacent trapezoidal steel girders are connected by a truss structure 11, and the perforated gusset plate and the corrugated steel web 3 at the end of the trapezoidal steel girder are connected by high-strength bolts 12 through round holes at the same position. Embodiment

[0044] In the fifth embodiment of the present invention, as Figure 4 shown, the main difference from the first embodiment is that the permanent bearing seat 8-2 is below the plane where the center line of the reinforced concrete end cross beam is located between the trapezoidal steel girders in the transverse direction of the bridge.

[0045] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and all these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A continuous composite small box girder bridge structure with corrugated steel webs, comprising a composite small box girder, a reinforced concrete end cross beam, a bridge pier, a bearing, a top plate connecting steel plate assembly, an end beam assembly, a box connecting plate assembly, stud connectors, a web opening connecting steel plate (10), a web truss connector (11) and a web truss connecting bolt (12), characterized in that: The small box girder includes a simply supported trapezoidal steel girder, a concrete bridge deck (1) and stud connectors. The simply supported trapezoidal steel girder includes a steel flange plate (2), a corrugated steel web (3) and a steel bottom plate (4). The top plate connecting steel plate assembly includes a side top plate perforated connecting steel plate (5-1) and a middle top plate perforated connecting steel plate (5-2). The end beam assembly includes a beam end steel diaphragm (6-1), a beam end steel cross beam (6-2), a general diaphragm (6-3) and a general lateral connection (6-4). The box connecting steel plate assembly includes an inner box bottom plate perforated connecting steel plate (7-1) and an inter-box bottom plate perforated connecting steel plate (7-2). The bearing includes a temporary bearing (8-1) and a permanent bearing (8-2). The stud connectors include a top plate stud (9-1), a diaphragm stud (9-2), a bottom plate stud (9-3) and a web stud (9-4); The interior of the steel girder small box girder is detachably connected to the beam end steel diaphragm (6-1). The outer surfaces on both sides of the steel girder small box girder are detachably connected to the beam end steel cross beam (6-2). The beam end steel diaphragm (6-1) and the beam end steel cross beam (6-2) correspond to each other in the transverse direction of the bridge. The cross section of the beam end steel cross beam (6-2) is in the shape of an I-beam or an inverted T-beam; Stud connectors are arranged on the inner side of the corrugated steel web (3) at the beam end of the beam end steel cross beam (6-2). The web perforated connecting steel plate (10) has round holes, and the positions of the round holes correspond to the stud connectors on the corrugated steel web (3) at the beam end of the trapezoidal steel girder. The web perforated connecting steel plate (10) is installed on the inner sides of the corrugated steel webs (3) at the beam ends of two adjacent simply supported trapezoidal steel girders. The stud connectors on the inner side of the corrugated steel web (3) pass through the round holes; Round holes are opened in the corrugated steel web (3) at the beam end of the trapezoidal steel girder, and the positions of the round holes correspond to the positions of the main reinforcement bars of the reinforced concrete end cross beam. The main reinforcement bars of the end cross beam penetrate through the round holes in the corrugated steel web (3) at the beam end; Stud connectors are arranged on the inner side of the corrugated steel web (3) at the beam end of the trapezoidal steel girder. Two adjacent corrugated steel webs (3) at the beam ends of the trapezoidal steel girders are connected by a truss structure. The truss structure consists of an upper chord, a lower chord, web members and perforated gusset plates. The upper chord and the web members intersect at the perforated gusset plate. The lower chord and the web members intersect at the perforated gusset plate. The perforated gusset plate has round holes. The stud connectors on the inner side of the corrugated steel web (3) at the beam end of the trapezoidal steel girder pass through the round holes in the perforated gusset plate. The members in the truss structure are made of angle steel or channel steel or I-shaped steel; The flange plate of the trapezoidal steel girder is a steel plate, and a closed box is formed by the steel flange plate (2), the corrugated steel web (3) and the steel bottom plate (4); When the main reinforcement bars of the reinforced concrete end cross beam intersect with the web perforated connecting steel plate (10) or the perforated gusset plate, the web perforated connecting steel plate (10) or the perforated gusset plate has round holes at the positions corresponding to the main reinforcement bars of the end cross beam to ensure that the main reinforcement bars of the end cross beam penetrate through; The reinforced concrete end cross beam is arranged with shear stirrups, the shear stirrups are arranged at a certain interval in the transverse direction of the bridge, the upper parts of the shear stirrups extend into the concrete bridge deck (1) in the area between the trapezoidal steel beams, and the shear stirrups are located at the ends of the trapezoidal steel beams below the top plate opening connection steel plate.

2. The construction method of a continuous composite small box girder bridge structure with corrugated steel webs as claimed in claim 1, wherein the construction method is as follows: S1. Processing and production of trapezoidal steel beams: First, the qualified steel materials are pre-treated by rolling, shot blasting or borax rust removal, and anti-rust primer. Secondly, the main components of the top plate, bottom plate, web plate, diaphragm, beam, plate unit stiffening rib, and splicing plate are laid out and numbered according to the processing drawings and processing and manufacturing process documents. Then, the main components are cut by precision cutting or plasma cutting and the dimensional deviation of the components is corrected. After that, the stiffening plate unit and the overall steel beam are welded and assembled on a stable and reliable tire frame in the order of "partial first and then overall". Finally, the overall surface of the steel beam is surface treated and then spray-painted; S2. Processing and production of perforated steel plates: Cut the blanking plates according to the design drawing size as in S1, straighten and level the plates, and then drill holes to obtain the top plate perforated steel connecting plates, bottom plate perforated steel connecting plates, and web connecting plates; S3. Support installation: Clean the temporary and permanent support locations of the piers and abutments, and smooth them with cement mortar to make the design elevation meet the requirements. Then, mark the center line of the support location according to the design drawing, and finally install the temporary and permanent supports; S4. Installation of simply supported trapezoidal steel beams and cross beams: hoist the steel beams hole by hole on site to form a simply supported state on temporary supports, and then install the cross beams between the boxes to connect the steel beams of the same span in the transverse direction of the bridge; S5. Installation of end cross beam reinforcement, cross plate and embedded parts: Install the bottom plate hole connection steel plate at the adjacent ends of the two span steel beams, pass the main reinforcement and frame reinforcement of the cross beam through the reserved holes in the web plate, arrange the end cross beam shear stirrups according to the spacing, tie the main reinforcement, frame reinforcement and stirrups firmly to form the end cross beam reinforcement skeleton, and finally install the top plate hole steel connection plate and support the template of the area not covered by the end cross beam connection plate; S6. Concrete pouring and curing of end cross beams: pour the concrete of the end cross beams and vibrate to make it dense. After the concrete solidifies, cover it with plastic film and sprinkle water for curing. After the cross beams reach the designed strength, remove the formwork; S7. Bridge deck construction: spray interface bonding agent on the upper part of the steel plate connecting the steel flange plate and the top plate opening, and pour the concrete bridge deck; S8. Removal of temporary supports: After the bridge deck reaches the design strength, the temporary supports shall be removed; S9. Bridge deck paving construction: Use high-quality asphalt binder for continuous paving and compaction.

3. The structural and construction method of a continuous composite small box girder bridge with corrugated steel webs according to claim 2, characterized in that: In the S2 construction step, the web connecting plate is a perforated steel connecting plate or a truss structure, the perforated steel connecting plate is processed according to S2, the truss structure rods are made of various types of steel according to size requirements, the node plate is lofted, cut, corrected and drilled according to the design drawings, and the truss structure is formed by welding the rods and the node plates; in the S5 construction step, after the bottom plate perforated connecting steel plate is installed, the web perforated connecting steel plate or the truss structure is installed; in the S7 construction step, the bridge deck construction is carried out simultaneously with S6.

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