Connecting structure of steel bridge tower and existing concrete pier

Abstract

The invention discloses a connecting structure for a steel bridge tower and an existing concrete pier. The connecting structure comprises a steel-concrete combined component hooped on the top of the pier and a bent cap. The steel-concrete combined member is divided into an upper-area steel-concrete member, a middle-area steel-concrete member and a lower-area steel member; the upper-area steel-concrete component and the middle-area steel-concrete component are each of a box-type steel structure, and micro-expansion concrete is poured into the box-type steel structures. The upper-area steel-concrete component is connected to the top face of the bent cap in an attached mode, and the two ends of the upper-area steel-concrete component protrude out of the two sides of the bent cap. The bottom of the steel bridge tower is connected to the top surface of the upper-area steel-concrete component; the middle-area steel-concrete component is divided into two parts which are arranged on the two sides of the bent cap in the longitudinal bridge direction and connected to the bottom of the upper-area steel-concrete component. The fixing problem of the steel bridge tower is solved, consolidation connection of the steel tower and the concrete pier can be achieved through the integrally-stressed steel-concrete base, and structural stress is definite; the existing bridge pier is used as the steel tower foundation, a steel bridge tower foundation does not need to be arranged independently, cost can be saved to a large extent, construction efficiency is improved, and environmental influences are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of connection structures between steel structure steel bridge towers and concrete bridge piers, and particularly relates to a connection structure between a steel bridge tower and an existing concrete bridge pier in a reconstructed bridge. Background Art

[0002] With the rapid development of the economy, the construction of transportation infrastructure has increasingly become an important part of the national strategy. As an important part of transportation infrastructure, cable-supported bridges have the characteristics of strong spanning ability and beautiful shape, and are increasingly used in urban and highway bridges. According to the relationship between the tower, beam, and pier, cable-supported bridges can be divided into different combined systems. Usually, the tower and the pier are integrally fixed structures and use the same type of material, and the connection between them is relatively simple. In the reconstruction of existing bridges, a combined system bridge that combines a cable-supported bridge and a girder bridge is often used. When a newly built steel bridge tower acts on an existing concrete bridge pier, in order to reduce the load, the steel bridge tower uses a steel structure. A fixed connection needs to be realized between the steel bridge tower and the concrete bridge pier, and a gradual transition of stiffness from concrete to steel structure needs to be achieved. For the connection between such different materials of the tower and the pier, there is currently no reasonable solution. Summary of the Invention

[0003] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a connection structure between a steel bridge tower and an existing concrete bridge pier.

[0004] To solve the above problems, the present invention adopts the following technical solutions: A connection structure between a steel bridge tower and an existing concrete bridge pier includes a steel-concrete composite member that is hoop-mounted on the top of the bridge pier and the capping beam; the steel-concrete composite member is divided into an upper-zone steel-concrete member, a middle-zone steel-concrete member, and a lower-zone steel member; both the upper-zone steel-concrete member and the middle-zone steel-concrete member are box-shaped steel structures and are filled with slightly expanding concrete inside; the upper-zone steel-concrete member is adhesively connected to the top surface of the capping beam, and both ends of the upper-zone steel-concrete member protrude from both sides of the capping beam; the bottom of the steel bridge tower is connected to the top surface of the upper-zone steel-concrete member; the middle-zone steel-concrete member is divided into two parts, which are respectively arranged on both sides of the capping beam along the longitudinal bridge direction and are connected to the bottom of the upper-zone steel-concrete member; the lower-zone steel member includes an annular steel plate and a steel member; the steel member is a box-shaped steel structure; the annular steel plate surrounds the top area of the bridge pier; the steel member is divided into two parts, located on both sides of the annular steel plate and welded to the annular steel plate as a whole; the two parts of the steel member are respectively connected to the bottoms of the two parts of the middle-zone steel-concrete member.

[0005] The upper zone steel-concrete components, the middle zone steel-concrete components and the lower zone steel components of the present invention form a "U"-shaped connection structure clamped on the top of the pier and the cap beam, and the steel bridge tower is connected to the top of the steel-concrete composite components, thereby realizing a consolidated connection between the tower and piers of different materials; for the concrete cap beam, the steel-concrete composite components increase its cross-sectional size, and the force-bearing performance can be greatly improved; for the top area of ​​the pier, plastic hinges are likely to appear here under the action of earthquakes, and the steel-concrete composite components increase its longitudinal and transverse stiffness, and the yield of the pier top area can be delayed; the upper zone steel-concrete components and the bottom of the steel bridge tower can form a stiffness transition section, thereby avoiding the problem of stress mutation caused by stiffness gradient difference.

[0006] Preferably, the upper steel-concrete member is connected to the top surface of the cap beam by a vertical anchor bolt, ensuring that the upper steel-concrete member is firmly connected to the cap beam and enhancing the overall stability of the steel-concrete composite member. Specifically, the lower end of the vertical anchor bolt is inserted and connected in the cap beam, the upper end of the vertical anchor bolt passes through the top of the upper steel-concrete member, and the upper end of the vertical anchor bolt is threadedly connected with a fastening nut, thereby firmly connecting the upper steel-concrete member to the cap beam.

[0007] Preferably, the bottom of the steel bridge tower is welded to the top surface of the upper zone steel-concrete member, so that the bottom of the steel bridge tower is firmly connected to the upper zone steel-concrete member.

[0008] Preferably, the middle steel-concrete member is connected to both sides of the cap beam by means of transverse steel tie rods, so as to ensure that the middle steel-concrete member is firmly connected to both sides of the cap beam, thereby enhancing the overall stability of the steel-concrete composite member. Specifically, the transverse steel tie rods transversely penetrate the cap beam and the middle steel-concrete member on both sides of the cap beam, and fastening nuts are threadedly connected at both ends of the transverse steel tie rods, thereby firmly connecting the middle steel-concrete member to both sides of the cap beam.

[0009] Preferably, the annular steel plate is connected to the top area of ​​the pier through lower area anchor bolts, and a plurality of lower area anchor bolts are distributed in an annular array on the circumferential surface of the top area of ​​the pier. One end of the lower area anchor bolt is inserted and connected to the pier, and the other end transversely penetrates the annular steel plate and is threadedly connected to a fastening nut at this end, thereby firmly connecting the annular steel plate to the circumferential surface of the top area of ​​the pier and preventing the annular steel plate from sliding down.

[0010] Preferably, steel glue is poured between the annular steel plate and the circumferential surface of the pier, so that the annular steel plate and the circumferential surface of the pier are firmly bonded, further improving the connection strength between the annular steel plate and the top of the pier.

[0011] Preferably, a corner stiffening plate is welded at the connection between the annular steel plate and the steel component, so as to enhance the connection strength between the annular steel plate and the steel component.

[0012] Preferably, anchoring glue is poured at the connection between the lower end of the vertical anchor bolt and the cap beam, so that the vertical anchor bolt is firmly inserted into the cap beam to prevent it from falling out.

[0013] Beneficial effects of the present invention: Compared with the prior art, the advantages of the present invention are: The upper steel-concrete components, the middle steel-concrete components and the lower steel components of the present invention form a "U"-shaped connection structure that is clamped on the top of the pier and the cap beam. The steel bridge tower is connected to the top of the steel-concrete composite component, realizing the consolidated connection between the tower and piers of different materials, strengthening the existing cap beam and the top area of ​​the pier. During the bridge operation and earthquake stages, the stress performance is greatly improved compared with the current status. The steel bridge tower is aligned with the pier, and the load of the steel bridge tower is directly transmitted to the pier cap beam and the pier. The tower and pier are consolidated, so that the old bridge part does not need a new steel bridge tower foundation, the structural stress is clear, the structure is simple, the construction efficiency is improved, the construction period is shortened, and the project cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 is a side view of the present invention; Figure 3 It is a schematic diagram of the plan layout of the upper zone steel-concrete member of the present invention; Figure 4 It is a schematic diagram of the plan layout of the middle zone steel-concrete member of the present invention; Figure 5 It is a schematic diagram of the plan layout of the lower zone steel member of the present invention.

[0015] Among them: 1. Steel-concrete components in the upper area; 2. Steel-concrete components in the middle area; 3. Steel components; 4. Vertical anchor bolts; 5. Horizontal steel tie rods; 6. Micro-expansive concrete; 7. Annular steel plates; 8. Corner stiffening plates; 9. Anchor bolts in the lower area; 10. Steel glue pouring; 100. Bridge piers; 200. Cap beams; 300. Steel bridge towers. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] like Figures 1-5As shown, the present invention provides a technical solution: a connection structure between a steel bridge tower and an existing concrete pier, which is arranged at the bottom of a newly built steel bridge tower 300, the pier cap beam 200 and the top area of ​​the pier 100, and needs to be aligned with the center of the pier 100 in the horizontal direction. The longitudinal and transverse lengths are determined comprehensively according to the width of the cap beam 200, the size of the bottom of the steel bridge tower 300 and the size of the pier 100, so as to ensure that the connection structure is arranged symmetrically relative to the center of the pier 100, which is beneficial to the overall earthquake resistance of the tower pier structure. The connection structure includes a steel-concrete composite component clamped on the top of the pier 100 and the cap beam 200, and the steel-concrete composite component is divided into an upper steel-concrete component 1, a middle steel-concrete component 2 and a lower steel component. The upper steel-concrete component 1 and the middle steel-concrete component 2 are both box-type steel structures and are poured with micro-expansive concrete 6. The lower steel component includes an annular steel plate 7, a steel component 3 and a corner stiffening plate 8. The steel component 3 is a box-type steel structure, and the corner stiffening plate 8 is supported and connected between the annular steel plate 7 and the steel component 3.

[0018] The bottom of the steel bridge tower 300 is welded to the top surface of the upper steel-concrete component 1. The maximum total height of the upper steel-concrete component 1 is the distance between the bottom of the main beam and the top surface of the pier cap beam 200. The upper steel-concrete component 1 is connected to the concrete cap beam 200 by vertical anchor bolts 4. The number of vertical anchor bolts 4 can be determined according to the actual force size and layout space.

[0019] The middle zone steel-concrete member 2 is divided into two parts, which are arranged on both sides of the cap beam 200 along the longitudinal direction of the bridge and connected to the bottom of the upper zone steel-concrete member 1, and are pressed and connected to the concrete cap beam 200 by using transverse steel tie rods 5.

[0020] The steel member 3 is a downward extension of the middle steel-concrete member 2. The annular steel plate 7 surrounds the top area of ​​the pier 100. The lower anchor bolts 9 and the steel glue 10 are used to firmly connect the annular steel plate 7 and the pier 100.

[0021] The upper steel-concrete member 1, the middle steel-concrete member 2 and the lower steel member form a "U"-shaped connection structure clamped on the top of the pier 100 and the cap beam 200. The steel bridge tower 300 is connected to the top of the steel-concrete composite member, realizing the consolidation connection between the tower and piers of different materials. For the concrete cap beam 200, the steel-concrete composite member increases its cross-sectional size, and the force-bearing performance can be greatly improved. For the top area of ​​the pier 100, plastic hinges are likely to appear here under the action of earthquakes, and the steel-concrete composite member increases its longitudinal and transverse stiffness, and the yield of the pier top area can be delayed. The upper steel-concrete member 1 and the bottom of the steel bridge tower 300 can form a stiffness transition section, which can avoid the problem of stress mutation caused by the stiffness gradient difference.

[0022] The specific implementation steps of the steel bridge tower and the existing concrete bridge pier connection structure of the present invention are as follows: First, in combination with the positions and dimensions of the steel bridge tower 300, the capping beam 200, and the pier 100, as well as the operating space, determine the spatial dimensions of the connection structure. Roughly process the surfaces of the steel plates and the concrete, explore the positions of the main steel bars inside the concrete structure, and drill pre - holes at the specific positions of the vertical anchor bolts 4, the horizontal steel tie rods 5, and the lower - area anchor bolts 9 in accordance with the principle of avoiding the main steel bars. At the same time, fabricate all the steel components of the steel - concrete composite components in blocks in the factory, and reserve openings on the steel plates according to the construction details. Next, install the annular steel plate 7 in the top area of the pier 100, use the lower - area anchor bolts 9 to firmly connect the annular steel plate 7 to the pier 100, and pour steel - filled adhesive 10 between the annular steel plate 7 and the pier 100. Next, install the vertical anchor bolts 4 on the top of the capping beam 200 and pour the anchoring adhesive, install the upper - area steel - concrete component 1, the middle - area steel - concrete component 2, the steel component 3, and the corner stiffening plate 8, install the horizontal steel tie rods 5, pour slightly expanding concrete 6 into the box - type steel structures of the upper - area steel - concrete component 1 and the middle - area steel - concrete component 2. Then, tighten the fastening nuts on the vertical anchor bolts 4 to fix the upper - area steel - concrete component 1, and then tighten the fastening nuts at both ends of the horizontal steel tie rods 5 to fix the middle - area steel - concrete component 2. Finally, install and weld the bottom section of the steel bridge tower 300 on the top of the upper - area steel - concrete component 1.

[0023] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A connection structure between a steel bridge tower and an existing concrete bridge pier, characterized in that: The invention comprises a steel-concrete composite component which is clamped on the top of the pier (100) and the cap beam (200); the steel-concrete composite component is divided into an upper steel-concrete component (1), a middle steel-concrete component (2) and a lower steel component; the upper steel-concrete component (1) and the middle steel-concrete component (2) are both box-type steel structures and are internally poured with micro-expansive concrete (6); the upper steel-concrete component (1) is fitted and connected to the top surface of the cap beam (200), and the two ends of the upper steel-concrete component (1) protrude from the two sides of the cap beam (200); The bottom of the steel bridge tower (300) is connected to the top surface of the upper steel-concrete component (1); the middle steel-concrete component (2) is divided into two parts, which are arranged on both sides of the cap beam (200) along the longitudinal bridge direction and connected to the bottom of the upper steel-concrete component (1); the lower steel component includes an annular steel plate (7) and a steel component (3); the steel component (3) is a box-type steel structure; the annular steel plate (7) surrounds the top area of ​​the pier (100); the steel component (3) is divided into two parts, which are located on both sides of the annular steel plate (7) and are welded to the annular steel plate (7) as a whole; the two parts of the steel component (3) are respectively connected to the bottom of the two parts of the middle steel-concrete component (2).

2. The connection structure between a steel bridge tower and an existing concrete bridge pier according to claim 1, characterized in that: The upper steel-concrete member (1) is connected to the top surface of the cap beam (200) via a vertical anchor bolt (4); the lower end of the vertical anchor bolt (4) is inserted and connected in the cap beam (200); the upper end of the vertical anchor bolt (4) passes through the top of the upper steel-concrete member (1); and the upper end of the vertical anchor bolt (4) is threadedly connected with a fastening nut.

3. The connection structure between a steel bridge tower and an existing concrete bridge pier according to claim 1, characterized in that: The bottom of the steel bridge tower (300) is welded to the top surface of the upper zone steel-concrete member (1).

4. The connection structure between a steel bridge tower and an existing concrete bridge pier according to claim 1, characterized in that: The middle steel-concrete member (2) is pressed and connected to both sides of the cap beam (200) by means of a transverse steel tie rod (5); the transverse steel tie rod (5) transversely penetrates the cap beam (200) and the middle steel-concrete member (2) on both sides of the cap beam (200); and fastening nuts are threadedly connected at both ends of the transverse steel tie rod (5).

5. The connection structure between a steel bridge tower and an existing concrete bridge pier according to claim 1 is characterized in that: The annular steel plate (7) is connected to the top area of ​​the pier (100) via a lower area anchor bolt (9), a plurality of lower area anchor bolts (9) are distributed in an annular array on the circumferential surface of the top area of ​​the pier (100), one end of the lower area anchor bolt (9) is inserted and connected to the pier (100), and the other end transversely penetrates the annular steel plate (7) and is threadedly connected to a fastening nut.

6. The connection structure between a steel bridge tower and an existing concrete bridge pier according to claim 1, characterized in that: Steel glue (10) is poured between the annular steel plate (7) and the circumferential surface of the bridge pier (100).

7. The connection structure between a steel bridge tower and an existing concrete bridge pier according to claim 1, characterized in that: A corner stiffening plate (8) is welded at the connection between the annular steel plate (7) and the steel component (3).

8. The connection structure between a steel bridge tower and an existing concrete bridge pier according to claim 2, characterized in that: Anchoring glue is injected at the connection between the lower end of the vertical anchor bolt (4) and the cap beam (200).

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