Corrugated steel web light cover beam

Abstract

This invention provides a lightweight cap beam with corrugated steel web, comprising an intermediate concrete section made of multiple prestressed steel strands connected as one unit, a corrugated steel web composite section, and end concrete sections. The intermediate concrete section is connected to the top of the pier, and end concrete sections are respectively provided at both ends of the cap beam. The corrugated steel web composite section connects the end concrete section and the intermediate concrete section. The corrugated steel composite section includes an upper concrete top slab, a lower concrete bottom slab, and two corrugated steel webs connecting the two. By using corrugated steel webs instead of traditional solid concrete, the self-weight of the cap beam is greatly reduced, making the cap beam more convenient and faster in prefabrication, transportation, and hoisting, reducing reliance on large construction equipment, and lowering construction costs and difficulty.

Description

Technical Field

[0001] This invention relates to the field of municipal viaduct design and construction technology, and in particular to a corrugated steel web lightweight cap beam. Background Technology

[0002] To achieve industrialized and rapid construction of urban bridges, prefabricated bridge construction methods are developing rapidly. Precast superstructures have various structural forms and years of practical experience in municipal bridges, with multiple mature implementation schemes. Rapid construction of the substructure remains an indispensable part of the overall rapid construction loop for urban bridges. Therefore, theoretical research and practical application of precast concrete substructures have been carried out both domestically and internationally. Due to their stress characteristics, substructures generally use concrete structures. Although precast concrete substructures have developed rapidly in recent years, they still have many shortcomings: Urban elevated roads are generally six-lane or eight-lane in both directions. They use prestressed concrete structures, and the weight of their cap beams is generally 200 to 300 tons. This poses a huge challenge to the bridges and underground pipelines along the route during transportation. The large lifting weight requires large and expensive equipment, which increases the construction cost and difficulty. Moreover, the excessive weight also places higher demands on the load-bearing capacity of the bridge substructure.

[0003] There are also cases where steel cap beams are used in the substructure to solve the problem of excessive weight of prestressed concrete cap beams.

[0004] Steel cap beams are lightweight, making transportation and hoisting easier than prestressed concrete cap beams. However, steel cap beams have drawbacks, such as high steel consumption, high cost, and weaker overall stiffness and resistance to bending and torsion compared to prestressed concrete cap beams. They may also deform more under load, affecting the normal use and safety performance of the bridge. Furthermore, steel cap beams have complex connection structures with concrete columns and require extensive maintenance.

[0005] Currently, there is still no good solution to the above-mentioned problems for precast cap beams for two-way six-lane and eight-lane roads. Summary of the Invention

[0006] The purpose of this invention is to provide a lightweight cap beam with corrugated steel web, which can solve the problems of heavy self-weight of prestressed concrete cap beams, low stiffness of steel cap beams, and high cost.

[0007] Therefore, the present invention adopts the following technical solution: A lightweight cap beam with corrugated steel web includes an intermediate concrete section, a corrugated steel web composite section, and end concrete sections, all of which are formed by connecting multiple prestressed steel strands. The intermediate concrete section is connected to the top of the pier, and the end concrete sections are respectively provided at both ends of the cap beam. The corrugated steel web composite section is connected between the end concrete section and the intermediate concrete section. The corrugated steel composite section includes an upper concrete top slab, a lower concrete bottom slab, and two corrugated steel webs connecting the two.

[0008] Based on the above technical solutions, the present invention may also employ the following further technical solutions, or combine these further technical solutions: The top surface of the bridge pier has multiple pre-embedded connecting bars, and the bottom of the intermediate concrete section has multiple pre-embedded connecting sleeves. The number and position of the connecting sleeves correspond one-to-one with the pre-embedded connecting bars and are fixedly connected.

[0009] The corrugated steel web is welded with flanges on both the upper and lower sides. Multiple equilateral angle steels are welded along the length of the flanges. The top equilateral angle steel is inserted into the concrete top slab, and the bottom equilateral angle steel is inserted into the concrete bottom slab. Multiple openings are provided on the equilateral angle steels, and through reinforcing bars are inserted into the openings.

[0010] The concrete top slab and the concrete bottom slab are respectively provided with square ring-shaped steel bars, and the through steel bars are inserted inside the square ring-shaped steel bars.

[0011] The two ends of the corrugated steel web extend into the middle concrete section and the end concrete section, respectively, and the two ends of the corrugated steel web are provided with shear keys for strengthening the anchorage.

[0012] The end concrete section is equipped with a maintenance manhole.

[0013] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. Reduced self-weight: By using corrugated steel webs instead of traditional solid concrete, the self-weight of the cap beam is greatly reduced, making the cap beam more convenient and faster in prefabrication, transportation and hoisting, reducing the dependence on large construction equipment, and reducing construction costs and difficulties.

[0014] 2. Economic efficiency: Compared with steel cap beams, this invention reduces the amount of steel used and lowers the cost while ensuring structural performance; compared with prestressed concrete cap beams, although it adds components such as corrugated steel webs, the reduced construction cost due to the lighter weight makes it more economical.

[0015] 3. Improved stiffness: The installation of prestressed steel strands and the reasonable combination of corrugated steel web and concrete structure effectively improve the stiffness of the cap beam, reducing its deformation under load and meeting the requirements for normal use and safety performance of the bridge structure.

[0016] Facilitates maintenance: The manhole located in the middle of the end concrete section provides convenient conditions for later maintenance and helps ensure the long-term safe operation of the bridge. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the elevation structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the planar structure of the present invention.

[0019] Figure 3 This is the present invention. Figure 1 Cross-sectional view at point AA.

[0020] Figure 4 This is the present invention. Figure 1 Cross-sectional view at point BB.

[0021] Figure 5 This is the present invention. Figure 1 Cross-sectional view at point CC.

[0022] Figure 6 This is the present invention. Figure 4 Enlarged view of point E in the middle.

[0023] Figure 7 This is a schematic diagram of the shear key of the present invention. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote elements with the same or similar functions throughout. However, it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the present invention. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size. It is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present invention.

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0026] The present invention provides a corrugated steel web lightweight cap beam, comprising an intermediate concrete section 1, a corrugated steel web composite section 2, and end concrete sections 3, which are formed by connecting multiple prestressed steel strands 7. The intermediate concrete section 1 is connected to the top of the pier 8, and end concrete sections 3 are respectively provided at both ends of the cap beam. The corrugated steel web composite section 2 is connected between the end concrete section 3 and the intermediate concrete section 1. The corrugated steel composite section 2 includes an upper concrete top slab 5, a lower concrete bottom slab 6, and two corrugated steel webs 4 connecting the two.

[0027] Multiple prestressed steel strands 7 connect the three structural sections—the intermediate concrete section 1, the corrugated steel web composite section 2, and the end concrete section 3—into a synergistic load-bearing system. Prestressed steel strands are installed along the entire length of the cap beam on the concrete top slab. By applying prestress, the pier top concrete section, the corrugated steel web section, and the end concrete section are connected in series, with the prestress anchored to the end concrete. The installation of prestressed steel strands effectively improves the load-bearing capacity and stiffness of the cap beam, reduces structural deformation under load, and also fully utilizes the material properties of each component, improving the structure's durability.

[0028] The prestressing tensioning of this invention is carried out in two stages: Factory prefabrication stage: After the concrete strength reaches the design value, 60% of the 7-strength prestressed steel strands are tensioned first (corresponding to the prestressed strands arranged along the entire length in the diagram). The prestressing at this stage mainly ensures the structural integrity of the cap beam during hoisting and transportation.

[0029] On-site installation phase: After the cap beam is in place and the superstructure installation is completed, the remaining 40% of the prestress is tensioned. This staged tensioning process can meet the stress requirements during construction and optimize the stress distribution in the completed bridge state.

[0030] Both the intermediate concrete section 1 and the end concrete section 3 are made of reinforced concrete and are cast with high-strength concrete during factory prefabrication.

[0031] The corrugated steel web 4 is rolled into shape in the factory using automated equipment, and its corrugated shape significantly improves the shear stability of the web.

[0032] The end concrete sections (corresponding to the areas at both ends of the cap beam in the diagram) are prefabricated in the factory simultaneously with the corrugated steel web sections, and a maintenance manhole is reserved in the middle for easy maintenance later. All component joints are equipped with sealed and waterproof structures to ensure structural durability.

[0033] The top surface of the pier 8 has multiple pre-embedded connecting bars, and the bottom of the middle concrete section 1 has multiple pre-embedded connecting sleeves 11. The number and position of the connecting sleeves 11 correspond one-to-one with the pre-embedded connecting bars and are fixedly connected.

[0034] like Figure 1 and Figure 2As shown, multiple pre-embedded connecting bars are arranged in a rectangular pattern on the two piers, and the position and quantity of the connecting sleeve 11 correspond one-to-one with the pre-embedded connecting bars.

[0035] like Figure 6 As shown, the upper and lower surfaces of the corrugated steel web 4 are respectively welded with flange plates 41. Multiple equilateral angle steels 42 are welded along the length of the flange plates 41. The top equilateral angle steel 42 is inserted into the concrete top slab 5, and the bottom equilateral angle steel 42 is inserted into the concrete bottom slab 6. Multiple openings are provided on the equilateral angle steel 42, and through steel bars 43 are inserted into the openings.

[0036] Square ring steel bars 44 are provided in the concrete top slab 5 and the concrete bottom slab 6 respectively, and through steel bars 43 are inserted inside the square ring steel bars 44.

[0037] like Figure 2 and Figure 7 As shown, the two ends of the corrugated steel web 4 extend into the middle concrete section 1 and the end concrete section 3, respectively. Both ends of the corrugated steel web 4 are provided with shear keys 45 for strengthening the anchorage, so as to achieve reliable force transmission.

[0038] like Figure 3 As shown, a maintenance manhole 31 is provided in the end concrete section 3 for convenient later maintenance.

[0039] The steel components used above undergo anti-corrosion treatment at the factory, and the thickness of the concrete protective layer is strictly controlled according to the design. The prestressing tensioning process is subject to dual control (stress control and elongation verification).

[0040] Based on the description and drawings of this invention, those skilled in the art can easily manufacture or use a corrugated steel web lightweight cap beam of this invention, and can produce the positive effects described in this invention.

[0041] It should be noted that the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "installed," "set," "equipped with," "connected," "linked," and "sleeve" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral construction; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two mechanisms, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] In the description of this invention, it should be understood that the terms "one end," "the other end," "outer side," "inner side," "horizontal," "end," "length," "outer end," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the mechanism or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. The terms "first" and "second" are also used only for the sake of brevity in description and do not indicate or imply relative importance.

[0043] Furthermore, in practicing the claims of this invention, those skilled in the art can understand and influence variations to the disclosed embodiments through a study of the drawings, the disclosure, and the appended claims. Additionally, in the claims and description, words such as "comprising" and "containing" do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes and modifications made in accordance with the present invention are covered by the scope of the claims of the present invention, and will not be listed here.

Claims

1. A lightweight cap beam with corrugated steel web, characterized in that, The structure includes an intermediate concrete section (1) formed by connecting multiple prestressed steel strands (7), a corrugated steel web composite section (2), and an end concrete section (3). The intermediate concrete section (1) is connected to the top of the pier (8). The end concrete sections (3) are respectively provided at both ends of the cap beam. The corrugated steel web composite section (2) is connected between the end concrete section (3) and the intermediate concrete section (1). The corrugated steel composite section (2) includes a concrete top slab (5) located above, a concrete bottom slab (6) located below, and two corrugated steel webs (4) connected between the two.

2. The corrugated steel web lightweight cap beam as described in claim 1, characterized in that, The top surface of the pier (8) has multiple pre-embedded connecting bars, and the bottom of the intermediate concrete section (1) has multiple pre-embedded connecting sleeves (11). The number and position of the connecting sleeves (11) correspond one-to-one with the pre-embedded connecting bars and are fixedly connected.

3. A corrugated steel web lightweight cap beam as described in claim 1, characterized in that, The corrugated steel web (4) is welded with flange plates (41) on the upper and lower sides respectively. Multiple equilateral angle steels (42) are welded along the length of the flange plates (41). The top equilateral angle steel (42) is inserted into the concrete top plate (5), and the bottom equilateral angle steel (42) is inserted into the concrete bottom plate (6). Multiple openings are provided on the equilateral angle steel (42), and through steel bars (43) are inserted into the openings.

4. A corrugated steel web lightweight cap beam as described in claim 3, characterized in that, The concrete top slab (5) and the concrete bottom slab (6) are respectively provided with square ring steel bars (44), and the through steel bar (43) passes through the square ring steel bars (44).

5. A corrugated steel web lightweight cap beam as described in claim 1, characterized in that, The two ends of the corrugated steel web (4) extend into the middle concrete section (1) and the end concrete section (3) respectively. Both ends of the corrugated steel web (4) are provided with shear keys (45) for strengthening the anchorage.

6. A corrugated steel web lightweight cap beam as described in claim 1, characterized in that, The end concrete section (3) is provided with a maintenance manhole (31).

Images