CN111560833A - Combined box girder structure - Google Patents
Combined box girder structure Download PDFInfo
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- CN111560833A CN111560833A CN202010520748.XA CN202010520748A CN111560833A CN 111560833 A CN111560833 A CN 111560833A CN 202010520748 A CN202010520748 A CN 202010520748A CN 111560833 A CN111560833 A CN 111560833A
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- uhpc
- box girder
- corrugated
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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Abstract
The invention discloses a combined box girder structure, which comprises a UHPC top plate, a corrugated steel web plate, a steel bottom plate and a steel diaphragm plate, wherein the bottom edges of the corrugated steel web plate and the steel diaphragm plate are vertically welded on the steel bottom plate, and the side edge of the steel diaphragm plate is vertically welded on the corrugated steel web plate; the top edges of the corrugated steel web plate and the steel diaphragm plate in the direction far away from the steel bottom plate are vertically connected with the bottom surface of the UHPC top plate. Because the tensile strength of the steel plate is strong, the compressive strength of the UHPC is 3 times of that of the common C50 concrete, the invention can fully play the tensile property of the steel bottom plate, the compressive property of the UHPC top plate and the accordion effect and the shearing resistance of the corrugated steel web plate, the self weight of the structure is lighter, the span is easier to increase, the number and the section of the lower structure are reduced, the anti-seismic property is increased, and the stress is reasonable.
Description
Technical Field
The invention belongs to the technical field of structural engineering, and particularly relates to a combined box girder structure, in particular to a corrugated steel web plate-steel bottom plate-UHPC top plate combined box girder structure.
Background
The prestressed concrete continuous box girder is widely applied to bridge construction in various countries. However, due to the large dead weight, the ratio of the dead weight of the large-span prestressed concrete continuous beam in the total load can reach 80% -90%, the span of the large-span prestressed concrete continuous beam is limited to be hardly more than 300m, and the large-span PC beam bridge is generally subjected to excessive main span downwarping and beam body cracking diseases in the operation process.
At present, there are two directions to the improvement of large-span prestressed concrete continuous beam: firstly, the box girder structure is innovative, typically, a corrugated steel web PC combined box girder replaces a concrete web which is easy to crack with a corrugated steel web which is not cracked, so that the aims of reducing the self weight of the structure, preventing the web from cracking and the like are fulfilled; secondly, the innovation of engineering materials is that High-strength and High-Performance materials, such as Ultra High Performance Concrete (UHPC), are adopted to replace common Concrete, so as to achieve the purposes of reducing the dead weight of the structure, improving the bearing capacity and durability of the structure, and the like. The corrugated steel web plate PC composite beam is not optimized in top and bottom plate structure, the top and bottom plates are generally constructed by a cast-in-place method in application, the construction process of the composite beam is complex, the shrinkage and creep of the concrete top and bottom plates still exist, and no obvious advantage is provided in the aspect of reducing the prestress loss.
Disclosure of Invention
The invention aims to provide a combined box girder structure, in particular to a corrugated steel web plate-steel bottom plate-UHPC top plate combined box girder structure, so that the span of the corrugated steel web plate PC combined box girder structure is increased, the shrinkage and creep of a concrete top plate and a concrete bottom plate are reduced, and the prestress loss is reduced.
The invention is realized in such a way that a combined box girder structure comprises a UHPC top plate, a corrugated steel web plate, a steel bottom plate and a steel diaphragm plate, wherein the bottom edges of the corrugated steel web plate and the steel diaphragm plate are vertically welded on the steel bottom plate, and the side edge of the steel diaphragm plate is vertically welded on the corrugated steel web plate; the top edges of the corrugated steel web plate and the steel diaphragm plate in the direction far away from the steel bottom plate are vertically connected with the bottom surface of the UHPC top plate.
Preferably, the steel bottom plate is provided with a reinforcing rib, and the reinforcing rib is parallel to the plate surface of the corrugated steel web plate and is perpendicular to the plate surface of the steel diaphragm plate.
Preferably, the steel diaphragm is provided with an external prestressed hole for penetrating through the prestressed steel bundles.
Preferably, the plurality of steel diaphragms take the end parts of the corrugated steel web plate or the steel bottom plate as starting positions and are welded on the steel bottom plate at equal intervals according to mechanical properties.
Preferably, the top edges of the corrugated steel web plate and the steel diaphragm plate are vertically connected to the bottom surface of the UHPC top plate through bolts.
Preferably, the side of the UHPC top plate close to the bottom surface is embedded with studs; and the top edges of the corrugated steel web plate and the steel diaphragm plate are fixed on the bottom surface of the UHPC top plate after being welded with the studs.
The invention overcomes the defects of the prior art and provides a combined box girder structure which comprises a UHPC top plate, a corrugated steel web plate, a flat steel bottom plate, a diaphragm plate and a longitudinal stiffening rib, wherein the corrugated steel web plate is arranged between the UHPC top plate and the flat steel bottom plate, the diaphragm plate is arranged between the corrugated steel web plates and is welded with the corrugated steel web plate and the flat steel bottom plate, the diaphragm plate is connected with the UHPC top plate through two connection modes of the invention, and the longitudinal stiffening rib is welded at the upper part of the flat steel bottom plate.
Compared with the defects and shortcomings of the prior art, the invention has the following beneficial effects: because the tensile strength of the steel plate is strong, the compressive strength of the UHPC is 3 times of that of the common C50 concrete, the invention can fully play the tensile property of the steel bottom plate, the compressive property of the UHPC top plate and the accordion effect and the shearing resistance of the corrugated steel web plate, the self weight of the structure is lighter, the span is easier to increase, the number and the section of the lower structure are reduced, the anti-seismic property is increased, and the stress is reasonable.
Drawings
FIG. 1 is a three-dimensional construction of the composite box girder structure of the present invention;
FIG. 2 is a schematic cross-sectional structure diagram of a corrugated steel web plate, a steel diaphragm plate and a UHPC top plate in the combined box girder structure of the invention adopting a high-strength bolt connection scheme,
FIG. 3 is a schematic cross-sectional structure diagram of a welding scheme of a corrugated steel web plate, a steel diaphragm plate and a UHPC top plate in the combined box girder structure of the invention by adopting an embedded stud steel plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in FIGS. 1 to 3, FIG. 1 is a three-dimensional structural view of a composite box girder structure according to the present invention; fig. 2 is a schematic cross-sectional structure diagram of a scheme of connecting a corrugated steel web plate, a steel diaphragm plate and a UHPC top plate by high-strength bolts in the combined box girder structure of the invention, and fig. 3 is a schematic cross-sectional structure diagram of a scheme of welding the corrugated steel web plate, the steel diaphragm plate and the UHPC top plate by pre-embedded stud steel plates in the combined box girder structure of the invention.
A combined box girder structure comprises a UHPC top plate 1, a corrugated steel web plate 2, a steel bottom plate 3 and a steel diaphragm plate 4, wherein the bottom edges of the corrugated steel web plate 2 and the steel diaphragm plate 4 are vertically welded on the steel bottom plate 3, and the side edge of the steel diaphragm plate 4 is vertically welded on the corrugated steel web plate 2; the top edges of the corrugated steel web plate 2 and the steel diaphragm plate 4 in the direction far away from the steel bottom plate 3 are vertically connected with the bottom surface of the UHPC top plate 1.
In the embodiment of the invention, the UHPC top plate 1 is an ultrahigh-performance concrete plate, the UHPC top plate 1, the corrugated steel web plate 2 and the steel bottom plate 3 form a structure with a U-shaped section, and the UHPC top plate 1, the corrugated steel web plate 2 and the steel bottom plate 3 are connected by the steel diaphragm plate 4 in a reinforcing and supporting manner.
In the embodiment of the invention, more specifically, a plurality of the steel diaphragms 4 are welded on the steel bottom plate 3 at equal intervals according to mechanical properties by taking the ends of the corrugated steel web 2 or the steel bottom plate 3 as starting positions.
In the embodiment of the invention, in order to enhance the structural strength, the steel bottom plate 3 is provided with the reinforced rib 5, and the reinforced rib 5 is parallel to the plate surface of the corrugated steel web plate 2 and is perpendicular to the plate surface of the steel diaphragm plate 4.
In the embodiment of the invention, in order to match penetration of the steel strand, specifically, the steel diaphragm 4 is provided with an external prestressed hole 6 for penetrating the prestressed steel strand.
In the embodiment of the invention, common connection modes between the UHPC top plate 1, the corrugated steel web plate 2 and the steel diaphragm plate 4 comprise Twin-PBL key connection, S-PBL matched bolt connection, angle steel shear connection, S-PBL key connection, embedded connection and the like. Specifically, as shown in fig. 2, the top edges of the corrugated steel web plate 2 and the steel diaphragm plate 4 are vertically connected to the bottom surface of the UHPC top plate 1 through bolts 7; alternatively, as shown in fig. 3, the stud 8 is embedded in the side of the UHPC top plate close to the bottom surface; the top edges of the corrugated steel web plate 2 and the steel diaphragm plate 4 are fixed on the bottom surface of the UHPC top plate 1 after being welded with the studs.
On the basis of a common corrugated steel web plate combined box girder, a flat steel plate is used as a bottom plate of the combined box girder, and a UHPC plate is used as a top plate 1 of the combined box girder, so that a steel bottom plate-UHPC top plate-corrugated steel web plate combined box girder structure is formed. In addition, the invention can fully exert the tensile property of the steel bottom plate 3, the compression resistance of the UHPC top plate 1 and the accordion effect and the shearing resistance of the corrugated steel web plate 2, has lighter self weight of the structure, is easier to increase the span, reduces the number and the section of the lower structure, increases the seismic resistance and has reasonable stress.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A combined box girder structure is characterized by comprising a UHPC top plate, a corrugated steel web plate, a steel bottom plate and a steel diaphragm plate, wherein the bottom edges of the corrugated steel web plate and the steel diaphragm plate are vertically welded on the steel bottom plate, and the side edge of the steel diaphragm plate is vertically welded on the corrugated steel web plate; the top edges of the corrugated steel web plate and the steel diaphragm plate in the direction far away from the steel bottom plate are vertically connected with the bottom surface of the UHPC top plate.
2. A composite box girder construction according to claim 1 wherein said steel bottom plate is provided with a ribbed rib parallel to the face of the corrugated steel web and perpendicular to the face of the steel diaphragm.
3. A composite box girder construction according to claim 1 wherein the steel diaphragms are provided with externally prestressed holes for passing through the prestressed steel strands.
4. A composite box girder construction according to claim 1 wherein a plurality of said steel diaphragms are welded to the steel bottom plate at equal intervals according to mechanical properties starting from the ends of the corrugated steel web or the steel bottom plate.
5. A composite box girder construction according to claim 1 wherein the corrugated steel web and the steel diaphragm are bolted vertically to the underside of the top UHPC deck.
6. The composite box girder construction of claim 1, wherein the top UHPC panel has pegs pre-embedded near a bottom side; and the top edges of the corrugated steel web plate and the steel diaphragm plate are fixed on the bottom surface of the UHPC top plate after being welded with the studs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010520748.XA CN111560833A (en) | 2020-06-10 | 2020-06-10 | Combined box girder structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010520748.XA CN111560833A (en) | 2020-06-10 | 2020-06-10 | Combined box girder structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111560833A true CN111560833A (en) | 2020-08-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010520748.XA Pending CN111560833A (en) | 2020-06-10 | 2020-06-10 | Combined box girder structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111560833A (en) |
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2020
- 2020-06-10 CN CN202010520748.XA patent/CN111560833A/en active Pending
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