Steel plate composite beam cable-stayed bridge tower beam consolidation connection structure

Abstract

The invention discloses a steel plate composite beam cable-stayed bridge tower beam consolidation connection structure which comprises a pressure-bearing steel plate, a concrete cushion block, a first connecting piece and a second connecting piece, the pressure-bearing steel plate is welded to the end of a steel main beam and is consolidated with the concrete cushion block through the first connecting piece, and the concrete cushion block and a concrete bridge tower are synchronously poured together. The concrete bridge deck slab is connected with the concrete bridge tower into a whole in a post-pouring mode, and the pressure-bearing steel plate and the concrete bridge tower are tightly connected together through the second connecting piece. The method has the advantages that the end pressure-bearing steel plates are adopted, axial force and bending moment are transmitted to the concrete bridge tower through the pressure-bearing steel plates, shearing force and torque are transmitted to the concrete bridge tower through connecting pieces of the pressure-bearing steel plates and friction force between the steel plates and the bridge tower, and the structural force transmission path is clear and simple; the pressure-bearing steel plates are provided with welding studs connected with the concrete cushion blocks, and conflict between the welding studs and concrete bridge tower main reinforcements is avoided; 3, the pressure-bearing steel plates are tightly connected with the concrete bridge tower through the opposite-pulling steel beams, so that insufficient shear capacity caused by small axial force of a main beam during construction is avoided, and meanwhile, the safety reserve of the structure during operation can be improved; the structure is simple, force transmission is reliable, and construction is simple.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a steel plate composite beam cable-stayed bridge tower-beam consolidation connection structure. Background Art

[0002] With the development of economy, the scale of cities is getting bigger and bigger, the construction of river bridges has been rapidly developed, and the requirements of river management departments for river bridges are becoming increasingly stringent. For most medium-sized rivers, management departments require one span to cross the main river. On this basis, single-tower cable-stayed bridges have gradually become a common bridge type in design because of their beautiful appearance, good structural stress, and span range suitable for most medium-sized rivers. Steel plate composite beams are the most widely used structural form of composite beam cable-stayed bridges. They have a simple structure and are generally composed of two steel main beams, steel cross beams, small longitudinal beams and concrete bridge decks. The steel main beams often adopt "I"-shaped or box-shaped sections. Using concrete bridge decks to replace the orthotropic steel plates under pressure on the upper edge of the steel beam can not only save costs, but also improve the performance of the bridge deck.

[0003] The consolidation system used in single-tower cable-stayed bridges is conducive to the cantilever construction of the main beam, which can effectively reduce the displacement of the beam end and no support is required at the tower beam. However, the connection structure between the steel main beam and the concrete bridge tower in the composite beam is relatively complex, and the construction steps are cumbersome, which limits its practical application. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a steel plate composite beam cable-stayed bridge tower beam consolidation connection structure to solve the deficiencies in the prior art.

[0005] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0006] Provided is a steel plate composite beam cable-stayed bridge tower-beam consolidation connection structure, which is arranged between the steel plate composite beam and the concrete bridge tower. The steel plate composite beam includes a steel main beam and a concrete bridge deck. The steel main beam includes a top plate, a bottom plate and a web. The tower-beam consolidation connection structure is characterized in that it includes a pressure-bearing steel plate, a concrete pad, a first connecting piece and a second connecting piece. The pressure-bearing steel plate is welded to the end of the steel main beam, the pressure-bearing steel plate is consolidated with the concrete pad through the first connecting piece, the concrete pad and the concrete bridge tower are cast together synchronously, the concrete bridge deck is post-cast and connected to the concrete bridge tower as a whole, and the pressure-bearing steel plate and the concrete bridge tower are tightly connected together through the second connecting piece.

[0007] For example, in the steel plate composite beam cable-stayed bridge tower-beam consolidation connection structure, the first connecting member is a welding nail.

[0008] For example, in the steel plate composite beam cable-stayed bridge tower-beam consolidation connection structure, the second connecting member is a tension steel bundle.

[0009] For example, the steel plate composite beam cable-stayed bridge tower beam consolidation connection structure further includes a stiffening plate, a steel pipe is arranged on the pressure-bearing steel plate, the steel pipe is welded to the top plate, bottom plate, web plate of the steel main beam and the pressure-bearing steel plate through the stiffening plate, an anchor plate is arranged at the end of the steel pipe, and the tension steel bundle passes through the steel pipe and is anchored on the anchor plate.

[0010] For example, in the steel plate composite beam cable-stayed bridge tower-beam consolidation connection structure, the tension steel bundles are made of low-relaxation steel strands, and the steel bundle anchor heads of the tension steel bundles are covered with epoxy mortar.

[0011] The beneficial effects of the technical solution of the present invention are:

[0012] 1. The end pressure-bearing steel plates are used. The axial force and bending moment are transmitted to the concrete bridge tower through the pressure-bearing steel plates. The shear force and torque are transmitted to the concrete bridge tower through the connectors of the pressure-bearing steel plates and the friction between the steel plates and the bridge towers. The structural force transmission path is clear and concise.

[0013] 2. The pressure-bearing steel plate is connected to the concrete pad with welding nails to avoid the conflict between the welding nails and the main reinforcement of the concrete bridge tower;

[0014] 3. The pressure-bearing steel plate is tightly connected to the concrete bridge tower through the tension steel strands to avoid the insufficient shear capacity caused by the small axial force of the main beam during construction, and at the same time, the safety reserve of the structure during operation can be improved;

[0015] 4. Simple structure, reliable force transmission and simple construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To further illustrate the above-mentioned objectives, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0017] Figure 1 It is an elevation view of the tower-beam consolidation connection structure of a preferred embodiment of the present invention;

[0018] Figure 2 Another elevation view of the tower-beam consolidation connection structure of a preferred embodiment of the present invention;

[0019] Figure 3 This is the cross-sectional view of the steel main beam side of the tower-beam consolidation connection structure;

[0020] Figure 4 This is the cross-sectional view of the tower side of the tower-beam consolidation connection structure;

[0021] In the figure: 1. Concrete bridge tower; 2. Steel main beam; 3. Concrete bridge deck; 4. Pressure-bearing steel plate; 5. Concrete pad; 6. Welding nails; 7. Tension steel bundle; 8. Steel pipe; 9. Reserved holes for steel bundle; 10. Stiffening plate. DETAILED DESCRIPTION

[0022] As used in this specification, the terms "invention" and "the present invention" are intended in a broad sense to refer to all subject matter of this specification and any of the following patent claims. Statements containing these terms should not be construed as limiting the subject matter described herein or the meaning or scope of any of the following patent claims. Further, this specification does not attempt to describe or limit the subject matter covered by any claim of any particular component, paragraph, statement, or drawing of this application. The subject matter should be understood with reference to the entire specification, all the drawings, and any of the following claims. The present invention may have other embodiments and may be practiced or embodied in other ways. Also, it should be understood that the language and terminology employed herein are for the purpose of description and should not be regarded as limiting.

[0023] Details of the present invention will now be discussed with reference to the drawings which illustrate the invention by way of example only. In the drawings, like features or components may be labeled with the same reference numerals.

[0024] The use of the terms "comprising", "having", "including" and variations thereof herein means including the items listed hereinafter and their equivalents and additional items. Although directions such as above, below, upward, downward, backward, bottom, top, front, back etc. may be referred to in the description of the drawings for convenience with reference to the drawings, these directions are not intended to be taken literally or to limit the present invention in any form. Further, terms such as "first", "second", "third" etc. are used herein for purposes of description and are not intended to indicate or imply importance or significance.

[0025] See Figures 1 to 4 As shown, in the preferred embodiment, the cable-stayed bridge tower-girder consolidation connection structure of the present invention is provided between the steel-concrete composite girder and the concrete bridge tower 1. The steel-concrete composite girder includes a steel main girder 2 and a concrete deck 3. The steel main girder 2 includes a top plate, a web, a bottom plate and corresponding stiffeners. The concrete deck 3 is cast on the top plate. This connection structure includes a bearing steel plate 4, a concrete cushion block 5, a first connecting member and a second connecting member. The bearing steel plate 4 is welded to the end of the steel main girder 2. The bearing steel plate 4 is consolidated with the concrete cushion block 5 through the first connecting member. The concrete cushion block 5 is cast synchronously with the concrete bridge tower 1. The concrete deck 3 is cast later and connected integrally with the concrete bridge tower 1. The concrete bridge tower 1 and the bearing steel plate 4 are tightly connected together through the second connecting member.

[0026] Further, the first connecting member is a stud 6, and the second connecting member is a tendom 7.

[0027] Continuing to refer to the illustration, stud welds 6 are provided on the side of the bearing steel plate 4 adjacent to the bridge tower for connection with the concrete cushion block 5. The bearing steel plate 4 is fully penetrated and welded to the steel main girder 2 on the side adjacent to the main girder. Steel pipes 8 and steel tendon reserved holes 9 are provided on the bearing steel plate 4. Stud welds 6 are provided at the top of the bearing steel plate 4 for connection with the concrete bridge deck 3. The steel pipes 8 on the bearing steel plate 4 are welded to the top plate, web plate of the steel main girder 2 and the bearing steel plate 4 through stiffening plates 10. Anchor plates are provided at the ends of the steel pipes 8. The steel tendons pass through the steel pipes 8 and are anchored on the anchor plates. Grouting holes are provided in the pipes in advance.

[0028] The tensioned steel tendons 7 adopt low-relaxation steel strands, and the anchor heads of the steel tendons need to be covered with epoxy mortar. There are two types of tensioned steel tendons 7 in total. The first type is to pass through the steel pipes 8 for tensioning, which are distributed near the top and bottom plates and the middle web plate of the steel box main girder, mainly responsible for restraining the internal force of the main girder. The second type is distributed around the bearing steel plate 4 to control the local deformation of the steel plate and is closely connected to the bridge tower.

[0029] The above are only the preferred embodiments of the present invention, and thus do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be realized that all equivalent replacements and obvious changes made by using the description and illustration content of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel plate composite beam cable-stayed bridge tower-beam consolidation connection structure, which is arranged between a steel plate composite beam and a concrete bridge tower, wherein the steel plate composite beam comprises a steel main beam and a concrete bridge deck, wherein the steel main beam comprises a top plate, a bottom plate and a web plate, and the tower-beam consolidation connection structure is characterized in that it comprises a pressure-bearing steel plate, a concrete pad, a first connecting member and a second connecting member, wherein the pressure-bearing steel plate is welded to the end of the steel main beam, the pressure-bearing steel plate is consolidated with the concrete pad through the first connecting member, the concrete pad is cast together with the concrete bridge tower simultaneously, the concrete bridge deck is post-cast and connected to the concrete bridge tower as a whole, and the pressure-bearing steel plate and the concrete bridge tower are tightly connected together through the second connecting member.

2. The steel plate composite beam cable-stayed bridge tower-beam consolidation connection structure as claimed in claim 1, characterized in that: The first connecting member is a welding nail.

3. The steel plate composite beam cable-stayed bridge tower-beam consolidation connection structure as claimed in claim 1, characterized in that: The second connecting member is a tension steel strand.

4. The steel plate composite beam cable-stayed bridge tower-beam consolidation connection structure as claimed in claim 3, characterized in that: It also includes a stiffening plate, a steel pipe is arranged on the pressure-bearing steel plate, the steel pipe is welded to the top plate, bottom plate, web plate and the pressure-bearing steel plate of the steel main beam through the stiffening plate, an anchor plate is arranged at the end of the steel pipe, and the tension steel bundle is anchored on the anchor plate after passing through the steel pipe.

5. The steel plate composite beam cable-stayed bridge tower-beam consolidation connection structure as claimed in claim 3 or 4, characterized in that: The tensioning steel bundles are made of low-relaxation steel strands, and the steel bundle anchor heads of the tensioning steel bundles are covered with epoxy mortar.

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