Concrete-filled steel tube corrugated steel web box girder
By setting up steel pipe concrete columns and reinforced structures in the corrugated steel web box beam, the buckling instability problem of corrugated steel web box beams at a larger span is solved, and a larger span and higher buckling stability is achieved. At the same time, the construction process is simplified and the working efficiency is improved.
Patent Information
- Application Number
- CN202422061673.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-08-26
AI Technical Summary
Existing corrugated steel web box beams are prone to buckling instability when they are larger spans, resulting in limited actual spans and longer construction difficulties and cycles.
Steel pipe concrete columns are installed in the corrugated steel web, and the structure is strengthened by transverse stiffening ribs and transverse partitions to improve buckling stability, while simplifying the construction process and reducing the need for on-site support and dismantling formwork.
A larger web height and bridge span are achieved, structural stability and construction efficiency are improved, support and dismantling operations of on-site formwork are avoided, and construction cycles are shortened.
Smart Images
Figure CN222935831U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bridge construction, in particular to a concrete-filled steel tube box girder with corrugated steel webs. Background Art
[0002] In recent years, corrugated steel webs have been more and more widely used in the field of bridge engineering. Compared with traditional concrete box girders, corrugated steel webs can solve the problem of easy cracking of the webs of traditional reinforced concrete box girders, and at the same time can significantly reduce the self-weight of the structure, making it convenient for the transportation and hoisting of components.
[0003] Since the height of the bridge girder increases with the increase of the bridge span, and there are generally large negative bending moments and shear forces at the supports. When the height of the corrugated steel web box girder is large, its buckling critical stress will be less than the yield stress of the steel, and then buckling instability will occur. Therefore, although the theoretical ultimate span of the corrugated steel web box girder bridge can reach more than 400 meters, the actual maximum span of the existing corrugated steel web box girder bridges is less than 200 meters. In order to break through the beam height limit, currently, the method of increasing the web thickness is often used to increase the buckling stability of the corrugated steel web. However, with the increase of the thickness, the material economy will be reduced, and the processing and manufacturing of the corrugated steel web will be more difficult.
[0004] In order to avoid the above situation, the Design Guide for Prestressed Concrete Bridges with Corrugated Steel Webs in Japan stipulates that when the height of the corrugated steel web is greater than 5m, lining concrete should be added inside the corrugated steel web to reduce the shear stress of the corrugated steel web. However, when constructing by the above method, formwork needs to be supported and removed in the box chamber, which increases the construction difficulty and prolongs the construction period. Summary of the Invention
[0005] In order to solve the above problems, the utility model provides a concrete-filled steel tube box girder with corrugated steel webs that is convenient for construction and has higher stability. Specifically, the following technical solutions can be adopted:
[0006] The concrete-filled steel tube box girder with corrugated steel webs of the utility model includes a concrete bridge deck top plate, a concrete box girder bottom plate and corrugated steel webs. Concrete-filled steel tubes are arranged inside the corrugated steel webs, and both ends of the concrete-filled steel tubes are connected to the concrete bridge deck top plate and the concrete box girder bottom plate.
[0007] The concrete-filled steel tube is composed of a steel tube and a self-compacting concrete filling body arranged inside it. Embedded steel bars welded to the main reinforcement bars of the concrete bridge deck top plate and the concrete box girder bottom plate are arranged inside the self-compacting concrete filling body.
[0008] The outer diameter of the steel tube is 200 - 600mm, the wall thickness is 10 - 16mm, and concrete pouring holes are arranged on the steel tube wall.
[0009] The concrete-filled steel tubular columns are arranged in two rows, symmetrically distributed along the longitudinal center line of the bridge, and the spacing between adjacent concrete-filled steel tubular columns in the same row is not greater than 10 m.
[0010] Transverse stiffeners are provided between the concrete-filled steel tubular columns and the corrugated steel webs on the same side.
[0011] Diaphragms connected to the concrete bridge deck slab, the concrete box girder bottom slab and the corrugated steel webs are provided between the concrete-filled steel tubular columns, and the spacing between adjacent diaphragms is not greater than 10 m.
[0012] Manholes for maintenance are provided on the diaphragms.
[0013] The thickness of the corrugated steel webs is 24 - 32 mm, and the diaphragms are welded to the corrugated steel webs.
[0014] Both the corrugated steel webs and the diaphragms are provided with upper and lower flange plates, and the upper and lower flange plates are connected to the concrete bridge deck slab and the concrete box girder bottom slab through stud bolts.
[0015] Prestressing tendons are provided in both the concrete bridge deck slab and the concrete box girder bottom slab, and lifting rings are provided on the concrete bridge deck slab.
[0016] The concrete-filled steel tubular corrugated steel web box girder provided by the present utility model has a stable structure and is easy to construct. By adding concrete-filled steel tubular columns on the basis of the traditional corrugated steel web box girder, the buckling stability of the corrugated steel web is improved, and a larger web height and bridge span are achieved; the concrete filled in the above steel tubes is in a triaxial stress state, with higher strength and better mechanical properties. Compared with the corrugated steel web prestressed concrete bridge with internal lining concrete, the present utility model can eliminate the on-site formwork support and removal operations, simplify the construction process, and improve the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is a structural schematic diagram of the present utility model.
[0018] Figure 2 is Figure 1 the A - A sectional view in DETAILED DESCRIPTION OF THE EMBODIMENTS
[0019] The embodiments of the present utility model will be described in detail below with reference to the drawings. The following embodiments are implemented on the premise of the technical solution of the present utility model, and detailed implementation manners and specific construction processes are given, but the protection scope of the present utility model is not limited to the following embodiments.
[0020] As Figure 1 、 2As shown in the figure, the concrete-filled steel tubular corrugated steel web box girder of the present utility model includes a concrete bridge deck top plate 1, a concrete box girder bottom plate 2, and corrugated steel webs 3. Concrete-filled steel tubular columns 4 are arranged inside both sides of the corrugated steel webs 3, and both ends of the concrete-filled steel tubular columns 4 are connected to the concrete bridge deck top plate 1 and the concrete box girder bottom plate 2.
[0021] Specifically, the concrete-filled steel tubular column 4 is composed of a steel pipe 41 and a self-compacting concrete filling body 42 arranged inside it. Embedded steel bars 43 welded to the main steel bars of the concrete bridge deck top plate 1 and the concrete box girder bottom plate 2 are arranged in the self-compacting concrete filling body 42. Usually, the outer diameter of the steel pipe 41 is 200 - 600 mm, the wall thickness is 10 - 16 mm, and concrete pouring holes are arranged on the wall of the steel pipe 41. The concrete-filled steel tubular columns 4 are arranged in two columns, and the two columns of concrete-filled steel tubular columns 4 are symmetrically distributed along the longitudinal center line of the bridge, and the distance between adjacent concrete-filled steel tubular columns 4 in the same column is not greater than 10 m. To improve the structural stability, transverse stiffeners 5 connected to the corrugated steel webs 3 on the same side are welded to the wall of the steel pipe 41 of each concrete-filled steel tubular column 4. In addition, diaphragms 6 connected to the concrete bridge deck top plate 1, the concrete box girder bottom plate 2, and the corrugated steel webs 3 are arranged between the concrete-filled steel tubular columns 4, and the distance between adjacent diaphragms 6 is not greater than 10 m. To facilitate maintenance, inspection manholes 61 are also opened on each diaphragm 6.
[0022] The thickness of the above-mentioned corrugated steel web 3 is usually 24 - 32 mm. The two sides of the diaphragm 6 are welded to the corrugated steel web 3, and upper and lower flange plates 31 are arranged at the top and bottom, which are the same as the corrugated steel web 3, and are connected to the concrete bridge deck top plate 1 and the concrete box girder bottom plate 2 through stud bolts 32. In addition, prestressing tendons 21 are arranged in both the concrete bridge deck top plate 1 and the concrete box girder bottom plate 2, and lifting rings 11 are arranged on the concrete bridge deck top plate 1.
[0023] During construction, first install the formwork required for pouring the concrete box girder bottom plate 2, then install and tension the prestressing tendons 21 in the concrete box girder bottom plate 2 to the design stress, bind the bottom plate steel mesh and arrange the embedded steel bars 43, install the fabricated corrugated steel web 3 and the steel pipe 41 of the concrete-filled steel tubular column 4, weld the two together through the transverse stiffeners 5, and then pour and cure the concrete box girder bottom plate 2; install the diaphragms 6, bind the steel mesh of the concrete bridge deck top plate 1 and install the top plate embedded steel bars 43, top plate prestressing tendons 21, and lifting rings 11, precast the concrete bridge deck top plate 1 and cure it, hoist the concrete bridge deck top plate 1 into place, pour self-compacting concrete with slow setting, early strength, good fluidity, and strong cohesion into the steel pipe 41 to form a self-compacting concrete filling body 42, and form the concrete-filled steel tubular column 4, then the prefabrication of the concrete-filled steel tubular corrugated steel web composite box girder can be completed, and it is transported to the construction site and the box girder hoisting operation is carried out.
[0024] It should be noted that in the description of the present utility model, terms indicating orientation or positional relationships such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.
Claims
1. A steel tube concrete corrugated steel web box girder, characterized in that: It comprises a concrete bridge deck top plate, a concrete box beam bottom plate and a corrugated steel web, wherein a steel tube concrete column is arranged inside the corrugated steel web, and both ends of the steel tube concrete column are connected to the concrete bridge deck top plate and the concrete box beam bottom plate.
2. The concrete-filled steel tube corrugated steel web box girder according to claim 1, characterized in that: The steel tube concrete column is composed of a steel tube and a self-compacting concrete filling body arranged inside the steel tube. The self-compacting concrete filling body is provided with embedded steel bars welded and connected to the main bars of the concrete bridge deck top plate and the concrete box beam bottom plate.
3. The concrete-filled steel tube corrugated steel web box girder according to claim 2, characterized in that: The outer diameter of the steel pipe is 200-600 mm, the wall thickness is 10-16 mm, and concrete pouring holes are arranged on the wall of the steel pipe.
4. The concrete-filled steel tube corrugated steel web box girder according to claim 2, characterized in that: The steel tube concrete columns are arranged in two rows, the two rows of steel tube concrete columns are symmetrically distributed along the longitudinal center line of the bridge, and the spacing between adjacent steel tube concrete columns in the same row is no more than 10m.
5. The concrete-filled steel tube corrugated steel web box girder according to claim 4, characterized in that: Transverse stiffening ribs are arranged between the steel tube concrete column and the corrugated steel web on the same side.
6. The concrete-filled steel tube corrugated steel web box girder according to claim 5, characterized in that: A transverse diaphragm connected to the concrete bridge deck top plate, the concrete box beam bottom plate and the corrugated steel web is arranged between the steel tube concrete columns, and the spacing between adjacent transverse diaphragms is not more than 10m.
7. The concrete-filled steel tube corrugated steel web box girder according to claim 6, characterized in that: A maintenance manhole is arranged on the transverse partition.
8. The concrete-filled steel tube corrugated steel web box girder according to claim 6, characterized in that: The thickness of the corrugated steel web is 24-32 mm, and the transverse partition is connected to the corrugated steel web by welding.
9. The concrete-filled steel tube corrugated steel web box girder according to claim 8, characterized in that: The corrugated steel web and the diaphragm are both provided with upper and lower flange plates, and the upper and lower flange plates are both connected to the concrete bridge deck top plate and the concrete box beam bottom plate through bolts.
10. The concrete-filled steel tube box girder with corrugated steel web according to claim 1, characterized in that: Prestressed tendons are arranged in the concrete bridge deck top plate and the concrete box beam bottom plate, and a hanging ring is arranged on the concrete bridge deck top plate.