CN212357941U - Combined box girder structure - Google Patents
Combined box girder structure Download PDFInfo
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- CN212357941U CN212357941U CN202021050460.2U CN202021050460U CN212357941U CN 212357941 U CN212357941 U CN 212357941U CN 202021050460 U CN202021050460 U CN 202021050460U CN 212357941 U CN212357941 U CN 212357941U
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Abstract
The utility model 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 steel sheet is strong, and UHPC's compressive strength is 3 times of ordinary C50 concrete, the utility model discloses the tensile strength that can full play steel bottom plate and the compressive property of UHPC roof, and the accordion effect and the shear behavior of wave form steel web, the structure dead weight is lighter, changes in the increase span, reduces substructure quantity and cross-section, and increase anti-seismic performance, the atress is reasonable.
Description
Technical Field
The utility model belongs to the technical field of structural engineering, especially, relate to a combination box girder structure, specifically be corrugated steel web-steel bottom plate-UHPC roof combination 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, engineering materials are innovated, high-strength and high-performance materials, such as Ultra High Performance Concrete (UHPC) are typically used for replacing common Concrete, and the purposes of reducing the self weight of the structure, improving the bearing capacity and durability of the structure and the like are achieved. 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.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a combination box girder construction specifically is wave form steel web-steel bottom plate-UHPC roof combination box girder construction to make the span of increase wave form steel web PC combination box girder construction, reduce the shrink of concrete top, bottom plate and creep, reduce prestressing loss.
The utility model discloses a realize like this, a combination case beam structure, this structure includes UHPC roof, wave form steel web, steel bottom plate and steel cross slab, wherein, wave form steel web, steel cross slab base all weld perpendicularly on steel bottom plate, and the steel cross slab side welds perpendicularly on wave form steel web; 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 utility model overcomes prior art's is not enough, provides a combination case beam structure, including UHPC roof, wave form steel web, flat steel bottom plate, cross slab and vertical stiffening rib, the wave form steel web sets up between UHPC roof and flat steel bottom plate, and the cross slab setting is between the wave form steel web, and with wave form steel web and flat steel bottom plate welded connection, the cross slab passes through utility model's two kinds of connected modes and is connected with the UHPC roof, vertical stiffening rib welding flat steel bottom plate upper portion.
Compare in prior art's shortcoming and not enough, the utility model discloses following beneficial effect has: because the tensile strength of steel sheet is strong, and UHPC's compressive strength is 3 times of ordinary C50 concrete, the utility model discloses the tensile strength that can full play steel bottom plate and the compressive property of UHPC roof, and the accordion effect and the shear behavior of wave form steel web, the structure dead weight is lighter, changes in the increase span, reduces substructure quantity and cross-section, and increase anti-seismic performance, the atress is reasonable.
Drawings
FIG. 1 is a three-dimensional structural view of the composite box girder structure of the present invention;
FIG. 2 is a schematic cross-sectional view of the corrugated steel web, the steel diaphragm and the UHPC top plate of the composite box girder of the present invention using high strength bolt connection,
fig. 3 is the cross-sectional structure schematic diagram that corrugated steel web, steel cross slab and UHPC roof adopt pre-buried stud steel sheet welding scheme among the utility model discloses combination box girder construction.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in 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 fig. 1 to 3, fig. 1 is a three-dimensional structural diagram of the composite box girder structure of the present invention; fig. 2 is the utility model discloses corrugated steel web, steel cross slab and UHPC roof adopt the cross-sectional structure schematic diagram of high-strength bolted connection scheme in the combination box girder construction, and fig. 3 is the utility model discloses corrugated steel web, steel cross slab and UHPC roof adopt the cross-sectional structure schematic diagram of pre-buried stud steel sheet welding scheme in the combination box girder construction.
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.
The embodiment of the utility model provides an in, UHPC roof 1 is ultra high performance concrete slab, and UHPC roof 1, corrugated steel web 2, steel bottom plate 3 constitute the structure that the cross-section is the U type, and steel cross slab 4 consolidates the support to UHPC roof 1, corrugated steel web 2, steel bottom plate 3 and connects.
In the embodiment of the present invention, more specifically, a plurality of the steel diaphragm plates 4 are welded on the steel bottom plate 3 at equal intervals according to mechanical properties with the end of the corrugated steel web 2 or the steel bottom plate 3 as the starting position.
In the embodiment of the utility model, for the additional strengthening, be equipped with on the steel bottom plate 3 and add rib 5, should add rib 5 and be parallel with the face of wave form steel web 2, and perpendicular with the face of steel cross slab 4.
In the embodiment of the present invention, for the penetration of the steel bundle, specifically, the external prestressed holes 6 for penetrating the prestressed steel bundle are provided on the steel diaphragm 4.
The embodiment of the utility model provides an in, common connected mode includes Twin-PBL key-type connection, S-PBL cooperation stud connection, angle steel shear force key-type connection, S-PBL key-type connection and bury formula connection etc. between UHPC roof 1 and corrugated steel web 2, the steel diaphragm plate 4. 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.
The utility model discloses on the basis of ordinary wave form steel web combination case roof beam, adopt flat steel board as the bottom plate of combination case roof beam, UHPC board forms steel bottom plate-UHPC roof-wave form steel web combination case roof beam structure as the roof 1 of combination case roof beam. Furthermore, the utility model discloses can full play steel bottom plate 3's tensile strength ability and UHPC roof 1's compressive property, and wave form steel web 2's accordion effect and shear behavior, the structure dead weight is lighter, changes in the increase span, reduces substructure quantity and cross-section, increases anti-seismic performance, and the atress is reasonable.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles 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 |
|---|---|---|---|
| CN202021050460.2U CN212357941U (en) | 2020-06-10 | 2020-06-10 | Combined box girder structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021050460.2U CN212357941U (en) | 2020-06-10 | 2020-06-10 | Combined box girder structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212357941U true CN212357941U (en) | 2021-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021050460.2U Active CN212357941U (en) | 2020-06-10 | 2020-06-10 | Combined box girder structure |
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| CN (1) | CN212357941U (en) |
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2020
- 2020-06-10 CN CN202021050460.2U patent/CN212357941U/en active Active
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