A precast concrete beam steel cantilever structure

Abstract

The utility model relates to a kind of precast concrete beam steel cantilever structure, including precast concrete beam, steel structure cantilever and the connecting component of connecting precast concrete beam and steel structure cantilever;Connecting component includes cantilever roof pre-buried shear member and cantilever vertical rib pre-buried shear member;Cantilever roof pre-buried shear member is pre-buried in precast concrete beam top, and the top surface of steel structure cantilever is connected;Pre-cast concrete beam side is equipped with reserved concrete vertical rib, and cantilever vertical rib pre-buried shear member is fixed on reserved concrete vertical rib, and the web of steel structure cantilever is connected.Compared with prior art, the utility model has the advantages that precast concrete beam and steel structure cantilever are combined to form a hybrid structure, fully exerting the advantages of concrete structure and steel structure, suitable for bridge cantilever position lower structure arrangement difficult or limited stress capacity condition;Steel structure cantilever is used, which not only greatly increases the load borne by precast concrete beam, but also increases the width of bridge and other advantages.

Description

Technical Field

[0001] This utility model relates to bridges, and more particularly to a precast concrete beam steel cantilever structure. Background Technology

[0002] Precast bridge assembly technology has developed rapidly and has significant advantages in urban road construction. Traditional cast-in-place construction methods require on-site formwork erection, rebar tying, concrete pouring, and waiting for curing, a cumbersome and time-consuming process that does not meet environmental protection requirements. Precast assembly technology prefabricates bridge superstructure components such as beams and decks in factories, ensuring a stable production environment and high component quality. These components are then transported to the construction site and quickly assembled into a whole using cranes. Substructure components such as pier bodies and cap beams can also be prefabricated and rapidly assembled on-site. This not only reduces on-site wet work and environmental pollution but also avoids continuous disruption to urban traffic caused by prolonged construction.

[0003] A search revealed that authorization announcement number CN216919967U discloses an NC-UHPC composite prefabricated concrete box girder and its bridge, specifically comprising a precast NC top slab, a precast NC bottom slab, and a precast UHPC variable cross-section straight web, wherein the precast UHPC variable cross-section straight web has a vertical end plate area larger than the middle plate area. This prior art discloses prefabricated concrete box girders and bridges, but ultra-high performance concrete (UHPC) has lower flexibility and higher cost.

[0004] In summary, the technical problem that needs to be solved is how to design a precast concrete beam-steel cantilever structure that is convenient to construct and economical. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology, such as low flexibility and high cost, and to provide a precast concrete beam steel cantilever structure.

[0006] The objective of this utility model can be achieved through the following technical solutions.

[0007] According to one aspect of the present invention, a precast concrete beam steel cantilever structure is provided, including a precast concrete beam, a steel cantilever arm, and a connecting component connecting the precast concrete beam and the steel cantilever arm. The connecting components include pre-embedded shear members in the cantilever top plate and pre-embedded shear members in the cantilever vertical rib; the pre-embedded shear members in the cantilever top plate are pre-embedded in the top of the precast concrete beam and connect to the top surface of the steel structure cantilever; the side of the precast concrete beam is provided with reserved concrete vertical ribs, and the pre-embedded shear members in the cantilever vertical ribs are fixed on the reserved concrete vertical ribs and connect to the web of the steel structure cantilever.

[0008] As a preferred technical solution, the cantilever top slab embedded shear member includes a cantilever top embedded connecting plate, an embedded top slab perforated shear plate, and an embedded top slab shear stud. The cantilever top embedded connecting plate is parallel to and installed on the surface of the precast concrete beam. The embedded top slab perforated shear plate is connected to and perpendicular to the cantilever top embedded connecting plate. The embedded top slab shear stud is parallel to the embedded top slab perforated shear plate and embedded in the concrete of the precast concrete beam.

[0009] As a preferred technical solution, the pre-embedded connecting plate at the top of the cantilever is welded to the top plate of the steel structure cantilever arm.

[0010] As a preferred technical solution, the cantilever vertical rib embedded shear member includes a cantilever vertical rib embedded connecting plate, an embedded web perforated shear plate, and an embedded web shear stud. The cantilever vertical rib embedded connecting plate is parallel to and installed on the reserved concrete vertical rib. The embedded web perforated shear plate is connected to and perpendicular to the cantilever vertical rib embedded connecting plate. The embedded web shear stud is parallel to the embedded web perforated shear plate and embedded in the concrete of the reserved concrete vertical rib.

[0011] As a preferred technical solution, the pre-embedded connecting plate of the cantilever vertical rib is welded to the web plate of the steel structure cantilever.

[0012] As a preferred technical solution, the reserved concrete vertical rib is provided with a reserved concrete bottom rib plate at one end away from the top of the precast concrete beam, and one end of the pre-embedded shear member of the cantilever vertical rib is connected to the pre-embedded shear member of the cantilever top plate, and the other end is connected to the reserved concrete bottom rib plate.

[0013] As a preferred technical solution, the cantilever vertical rib pre-embedded shear member and the reserved concrete bottom rib plate are connected by a pre-embedded perforated shear plate.

[0014] As a preferred technical solution, one side of the precast concrete beam is connected to the pre-embedded shear member of the cantilever vertical rib, and the other side is connected to another precast concrete beam through a wet joint between beams.

[0015] Compared with the prior art, the present invention has the following beneficial effects.

[0016] 1) This utility model combines a precast concrete beam and a steel cantilever to form a hybrid structure, fully utilizing the advantages of both concrete and steel structures. It is suitable for situations where the substructure arrangement at the cantilever location of a bridge is difficult or the load-bearing capacity is limited. The steel cantilever is economical, lightweight, and has a reasonable stress distribution. Using a steel cantilever does not significantly increase the load on the precast concrete beam while increasing the bridge width. The precast concrete beam and steel cantilever are connected by pre-embedded shear members in the cantilever top plate and vertical ribs, which can resist horizontal and vertical forces, ensuring the stability of the connection. The pre-embedded shear members in the vertical ribs are fixed to the reserved concrete vertical ribs. These pre-embedded shear members do not affect the original internal structure and stress conditions of the precast concrete beam, preventing stress conflicts and making the overall structure more stable.

[0017] 2) The pre-embedded perforated shear plate in this utility model resists horizontal and shear forces, while the pre-embedded shear studs in the top plate resist vertical forces, both serving an anchoring function. The pre-embedded perforated shear plate in the web plate provides vertical shear resistance, and the pre-embedded shear studs in the web plate resist bending moments, both serving an anchoring function.

[0018] 3) The precast concrete beam of this utility model is connected to steel structure cantilever arms or another precast concrete beam on both sides, which can be expanded according to the actual bridge deck width required. Transverse diaphragms are set at the beam ends and mid-span of the precast concrete beam to form an integral structure, which is beneficial to the overall overturning resistance and overall stress. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of a precast concrete beam steel cantilever structure according to the present invention.

[0020] The numbers in the diagram are as follows: 1. Precast concrete beam; 2. Steel cantilever; 3. Embedded connecting plate at the top of the cantilever; 4. Embedded shear studs in the top slab; 5. Embedded shear plate with openings in the top slab; 6. Reserved concrete vertical ribs; 7. Embedded connecting plate for the vertical ribs of the cantilever; 8. Embedded shear plate with openings in the web; 9. Embedded shear studs in the web; 10. Reserved concrete bottom rib plate; 11. Embedded shear plate with openings. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present utility model.

[0022] This utility model provides a precast concrete beam cantilever structure, including a precast concrete beam 1, a steel cantilever 2, and a connecting assembly connecting the precast concrete beam 1 and the steel cantilever 2. The connecting assembly includes pre-embedded shear members in the cantilever top slab and pre-embedded shear members in the cantilever vertical ribs. This utility model improves upon the conventional cantilever structure of the precast concrete beam 1 by adopting a long steel cantilever structure, achieving the effects of light weight and good applicability.

[0023] The precast concrete beam 1 can be a small box girder, a hollow slab beam, or a T-beam. This invention is also applicable to cast-in-place beams.

[0024] One side of the precast concrete beam 1 is equipped with a reserved concrete vertical rib 6. The steel structure cantilever 2 is installed on one side of the reserved concrete vertical rib 6 through pre-embedded shear members in the cantilever vertical rib. The reserved concrete vertical rib 6 can prevent the installation structure of the steel structure cantilever 2 from affecting the original internal structure of the precast concrete beam 1 and causing stress conflicts. One side of the precast concrete beam 1 is connected to the pre-embedded shear member in the cantilever vertical rib, and the other side is connected to another precast concrete beam 1 through a wet joint between beams; or both sides of the precast concrete beam 1 are connected to the pre-embedded shear members in the cantilever vertical rib. It can be expanded according to the required width of the bridge deck.

[0025] The pre-embedded shear components in the cantilever top slab include a pre-embedded connecting plate 3, a pre-embedded perforated shear plate 5, and a pre-embedded shear stud 4. The pre-embedded connecting plate 3 is embedded parallel to and embedded in the concrete on the upper surface of the precast concrete beam 1, and one side is welded to the top slab of the steel cantilever 2. The width of the pre-embedded connecting plate 3 only needs to meet the local shear transmission requirements. Multiple pre-embedded perforated shear plates 5 are connected to one side of the pre-embedded connecting plate 3. The pre-embedded perforated shear plates 5 are perpendicular to the pre-embedded connecting plate 3 and extend in the same direction as the bridge extension direction, resisting horizontal forces and shear forces, and playing an anchoring role. The pre-embedded shear stud 4 is parallel to the pre-embedded perforated shear plate 8 in the web and is embedded in the concrete of the precast concrete beam 1, resisting vertical forces, and playing an anchoring role.

[0026] The cantilever vertical rib embedded shear components include a cantilever vertical rib embedded connecting plate 7, embedded web perforated shear plates 8, and embedded web shear studs 9. The cantilever vertical rib embedded connecting plate 7 is parallel to and embedded in the concrete of the reserved concrete vertical rib 6, with one side welded to the web of the steel structure cantilever 2; multiple embedded web perforated shear plates 8 are connected to the other side of the cantilever vertical rib embedded connecting plate 7, and the embedded web perforated shear plates 8 are perpendicular to the cantilever vertical rib embedded connecting plate 7, with the extension direction being the same as the extension direction of the bridge; the embedded web shear studs 9 are parallel to the embedded web perforated shear plates 8, embedded in the concrete of the reserved concrete vertical rib 6, and resist shear force.

[0027] One end of the precast concrete beam 1 is provided with a reserved concrete bottom rib plate 10. The concrete bottom rib plate extends parallel to the extension direction of the bridge and has an I-shaped cross-section. One end of the pre-embedded shear member of the cantilever vertical rib is connected to the pre-embedded shear member of the cantilever top plate, and the other end is connected to the reserved concrete bottom rib plate 10. The pre-embedded perforated shear plate 11 is embedded in the reserved concrete bottom rib plate 10 and is anchored by drilling holes.

[0028] This invention is simple and easy to implement. Based on commonly used precast prestressed concrete beams, it adopts a large cantilever steel structure, which increases the beam width without significantly increasing the load on the concrete box girder. The use of a steel-concrete composite structure leverages the advantages of both concrete and steel structures. This invention is suitable for adding sidewalks to both sides of bridges, widening bridge decks, and widening bridges at intersections with rounded corners. Therefore, this invention is economical, lightweight, and has a reasonable stress distribution.

[0029] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A precast concrete beam-steel cantilever structure, characterized in that, It includes a precast concrete beam (1), a steel cantilever (2), and connecting components that connect the precast concrete beam (1) and the steel cantilever (2); The connecting components include pre-embedded shear members in the cantilever top plate and pre-embedded shear members in the cantilever vertical rib; the pre-embedded shear members in the cantilever top plate are pre-embedded in the top of the precast concrete beam (1) and connected to the top surface of the steel structure cantilever arm (2); the side of the precast concrete beam (1) is provided with reserved concrete vertical ribs (6), and the pre-embedded shear members in the cantilever vertical rib are fixed on the reserved concrete vertical ribs (6) and connected to the web of the steel structure cantilever arm (2).

2. The precast concrete beam-steel cantilever structure according to claim 1, characterized in that, The cantilever top slab embedded shear components include a cantilever top embedded connecting plate (3), an embedded top slab perforated shear plate (5), and an embedded top slab shear nail (4). The cantilever top embedded connecting plate (3) is parallel to and installed on the surface of the precast concrete beam (1). The embedded top slab perforated shear plate (5) is connected to and perpendicular to the cantilever top embedded connecting plate (3). The embedded top slab shear nail (4) is parallel to the embedded top slab perforated shear plate (5) and embedded in the concrete of the precast concrete beam (1).

3. A precast concrete beam-steel cantilever structure according to claim 2, characterized in that, The pre-embedded connecting plate (3) at the top of the cantilever is welded to the top plate of the steel structure cantilever (2).

4. A precast concrete beam-steel cantilever structure according to claim 1, characterized in that, The cantilever vertical rib embedded shear member includes a cantilever vertical rib embedded connecting plate (7), an embedded web opening shear plate (8), and an embedded web shear nail (9). The cantilever vertical rib embedded connecting plate (7) is parallel to and installed on the reserved concrete vertical rib (6). The embedded web opening shear plate (8) is connected to and perpendicular to the cantilever vertical rib embedded connecting plate (7). The embedded web shear nail (9) is parallel to the embedded web opening shear plate (8) and embedded in the concrete of the reserved concrete vertical rib (6).

5. A precast concrete beam-steel cantilever structure according to claim 4, characterized in that, The pre-embedded connecting plate (7) of the cantilever vertical rib is welded to the web of the steel structure cantilever (2).

6. A precast concrete beam-steel cantilever structure according to claim 1, characterized in that, The reserved concrete vertical rib (6) is provided with a reserved concrete bottom rib plate (10) at one end away from the top of the precast concrete beam (1). One end of the pre-embedded shear member of the cantilever vertical rib is connected to the pre-embedded shear member of the cantilever top plate, and the other end is connected to the reserved concrete bottom rib plate (10).

7. A precast concrete beam-steel cantilever structure according to claim 6, characterized in that, The cantilever vertical rib embedded shear member and the reserved concrete bottom rib plate (10) are connected by a pre-embedded perforated shear plate (11).

8. A precast concrete beam-steel cantilever structure according to claim 1, characterized in that, One side of the precast concrete beam (1) is connected to the pre-embedded shear member of the cantilever vertical rib, and the other side is connected to another precast concrete beam (1) through a wet joint between beams.

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