A connection structure of a steel-concrete joint section of a steel arch bridge arch foot and a construction method thereof

Abstract

The invention discloses a connection structure of a steel-concrete combined section of a steel arch bridge arch foot and a construction method thereof. The connection structure comprises a steel arch rib, a steel connection section and a reinforced concrete bridge pier; the steel connection section is composed of an embedded section located in the middle and cast in the reinforced concrete bridge pier and an extended section located at both ends and extending outward from the reinforced concrete bridge pier; the extended section is butt-welded to the steel arch ribs on both sides. A pressure plate is arranged on the surface of the reinforced concrete bridge pier and is located between the embedded section and the extended section, and both the embedded section and the extended section are welded to the pressure plate. A shear connector is arranged on the steel structure surface of the embedded section and connected to the pier concrete. The invention gives full play to the material properties of steel and concrete, transfers and balances the bending moment at the arch foot through the steel structure of the connection section, cancels the complex hinged structure arranged at the arch foot of the traditional steel arch bridge, avoids the construction difficulties caused by tensioning the short prestressed steel bundle at the bridge pier, reduces the construction difficulty at the arch foot of the steel arch bridge, shortens the construction period, and reduces the project cost.

Description

Technical Field

[0001] The invention belongs to the field of bridge engineering construction, and in particular relates to a connection structure of a steel arch bridge arch foot steel-concrete combined section and a construction method thereof. Background Art

[0002] Arch bridges have a long history of development and play an important role in modern highway and urban road bridge projects. Arch rings of arch bridges are mostly made of reinforced concrete, steel box, steel tube concrete, etc. Among them, steel box arch ribs are widely used in large-span arch bridges and multi-span arch bridges due to their light weight, easy processing and manufacturing, and on-site construction.

[0003] For multi-span arch bridges, in order to resist the unbalanced thrust and bending moment of the arch foot caused by the deadweight of each hole structure and the accumulated temperature force of the super-long link, each arch foot and concrete pier are usually consolidated to form a steel-concrete combined section. The structure of the steel-concrete combined section is mainly based on the force of the steel arch foot. The concrete wraps and fills the arch foot segment to make it an integral structure, assisting the steel arch foot to bear the force, thereby reasonably transferring the load borne by the bridge superstructure to the concrete pier column, effectively avoiding the uneven force of the arch foot and the generation of cracks.

[0004] In order to resist the unbalanced thrust and bending moment at the connection between the arch foot and the pier, traditional structures usually use prestressed steel strands to anchor the arch foot steel structure. Usually, this part of the structure is limited by the size of the pier, which not only makes construction difficult but also has structural defects such as short anchor strands and obvious prestress loss. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a steel arch bridge arch foot steel-concrete combined section connection structure and a construction method thereof, so as to achieve the purpose of simple structure and convenient construction.

[0006] The solution provided by the present invention is:

[0007] On one hand, the present invention provides a connection structure of a steel-concrete joint section of a steel arch bridge arch foot, comprising a steel arch rib, a steel connection section and a reinforced concrete bridge pier; the steel connection section comprises a pre-embedded section located in the middle and cast in the reinforced concrete bridge pier and an extended section located at both ends and extending outward from the reinforced concrete bridge pier; the extended section is butt-welded to the steel arch ribs on both sides. The bending moment of the steel arch rib at the arch foot is balanced by the steel connection section, and there is no need to tension prestress at the arch foot.

[0008] Furthermore, the steel arch rib is in the form of a steel box, an I-beam or a steel pipe. The steel connecting section can be prefabricated in a factory or welded on site.

[0009] Furthermore, the embedded section and the extended section are both in the form of steel box beams.

[0010] Furthermore, a pressure plate is arranged on the surface of the reinforced concrete pier and is located between the embedded section and the extended section. The embedded section and the extended section are both welded to the pressure plate; or the embedded section and the extended section are directly butt-welded.

[0011] Furthermore, a shear connector is provided on the surface of the steel structure of the embedded section to be connected to the pier concrete; the shear connector is in the form of a welded nail, a perforated plate or a combination of the two.

[0012] On the other hand, the present invention also provides a construction method for a connection structure of a steel arch bridge arch foot steel-concrete joint section, comprising the following steps:

[0013] Step 1: Process the steel connection section; simultaneously tie the steel bars of the reinforced concrete pier;

[0014] Step 2: Accurately position and install the steel connection section;

[0015] Step 3: pouring bridge pier concrete;

[0016] Step 4: After the concrete strength of the bridge pier reaches the requirement, hoist the steel arch rib and align and weld it at the steel connection section.

[0017] The connection structure of the steel-concrete combined section of the arch foot of a steel arch bridge provided by the present invention and the construction method thereof have the following beneficial effects:

[0018] (1) The steel components of the present invention can be prefabricated in factories, with high prefabrication accuracy and fast construction speed;

[0019] (2) The present invention makes full use of the material properties of steel and concrete, transfers and balances the bending moment at the arch foot through the connecting section steel structure, eliminates the complex hinged structure set at the arch foot of the traditional steel arch bridge, avoids the construction difficulties caused by tensioning short prestressed steel strands at the pier, reduces the construction difficulty at the arch foot of the steel arch bridge, and the connecting structure is easy and quick to install. After positioning and installation, concrete is directly poured without tensioning prestress, shortening the construction period and facilitating construction;

[0020] (3) The present invention has a simple structure, clear force transmission, safety and reliability, and saves cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the connection between the steel arch rib, the steel connecting section and the reinforced concrete bridge pier of the present invention.

[0022] Figure 2 for Figure 1 Elevation drawing of the steel connection section.

[0023] Figure 3 for Figure 1 Plan view of the steel connection section (without showing the pier concrete).

[0024] As shown in the figure: steel arch rib 1, steel connecting section 2, reinforced concrete pier 3, extension section 4, pressure plate 5, embedded section 6, shear connector 7. DETAILED DESCRIPTION

[0025] The following will further describe in detail the connection structure of the steel-concrete joint section of the arch foot of a steel arch bridge and the construction method thereof in combination with the accompanying drawings and specific embodiments, so as to fully understand the purpose, characteristics and effects of the present invention. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention; the above is only a description of the preferred embodiments of the present invention, and is not any limitation on the scope of the present invention.

[0026] The connection structure of the steel-concrete joint section of the steel arch bridge arch foot used in this embodiment is shown in FIG. Figure 1-Figure 3 As shown, it includes a steel arch rib 1, a steel connection section and a reinforced concrete pier 3. The steel connection section 2 includes an embedded section 6 located in the middle and cast in the reinforced concrete pier 3 and an extended section 4 located at both ends and extending outward from the reinforced concrete pier 3. The extended section 4 is butt-welded to the steel arch ribs 1 on both sides.

[0027] In this embodiment, the steel arch rib 1 is in the form of a steel box. The embedded section 6 and the extended section 4 are both in the form of a steel box. Figure 2 and Figure 3 The pressure plate 5 is arranged on the surface of the reinforced concrete pier 3 and is located between the embedded section 6 and the extended section 4. The embedded section 6 and the extended section 4 are welded to the pressure plate 5. The steel structure surface of the embedded section 6 is provided with a shear connector 7 to connect with the pier concrete; the shear connector can be in the form of a welded nail, a perforated plate or a combination of the two. In this embodiment, the shear connector 7 is in the form of a combination of a welded nail and a perforated plate.

[0028] The construction method of the above-mentioned connection structure comprises the following steps:

[0029] Step 1: The steel connection section is prefabricated in the factory or welded on site, and the reinforced concrete pier reinforcement is tied simultaneously;

[0030] Step 2: Accurately position and install the steel connection section;

[0031] Step 3: pouring bridge pier concrete;

[0032] Step 4: After the concrete strength of the bridge pier reaches the requirement, hoist the steel arch rib and align and weld it at the steel connection section.

[0033] This embodiment only illustrates the structural characteristics and construction method of using steel box arch ribs. The structural characteristics and construction method of using I-shaped arch ribs or steel tube concrete arch ribs are the same.

[0034] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to the above descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A connection structure of a steel arch bridge arch foot steel-concrete joint section, characterized in that: The invention comprises a steel arch rib (1), a steel connection section (2) and a reinforced concrete pier (3); the steel connection section (2) comprises a pre-embedded section (6) cast in the middle of the reinforced concrete pier (3) and an extended section (4) extending outward from the reinforced concrete pier (3) at both ends; the extended section (4) is butt-welded to the steel arch ribs (1) on both sides; the bending moment of the steel arch rib (1) at the arch foot is transferred and balanced by the steel connection section (2); a pressure plate (5) is arranged on the surface of the reinforced concrete pier (3) and is located between the pre-embedded section (6) and the extended section (4); the pre-embedded section (6) and the extended section (4) are both welded to the pressure plate (5), or the pre-embedded section (6) and the extended section (4) are directly butt-welded; a shear connector (7) is arranged on the steel structure surface of the pre-embedded section (6) to be connected to the pier concrete.

2. The connection structure of the steel-concrete joint section of the steel arch bridge arch foot according to claim 1 is characterized in that: The steel arch rib (1) is in the form of a steel box, an I-beam or a steel pipe.

3. The connection structure of the steel-concrete joint section of the steel arch bridge arch foot according to claim 1 is characterized in that: The embedded section (6) and the extended section (4) are both in the form of steel box beams.

4. The connection structure of the steel-concrete joint section of the steel arch bridge arch foot according to claim 1 is characterized in that: The shear connector (7) is in the form of a welding nail, a perforated plate or a combination of the two.

5. The construction method of the connection structure of the steel-concrete joint section of the steel arch bridge arch foot according to any one of claims 1 to 4, characterized in that The following steps are involved: Step 1: Processing steel connection section; Synchronously tie the steel bars of reinforced concrete bridge piers; Step 2: accurately positioning and installing the steel connection section in the uncast reinforced concrete bridge pier, and making the extended sections at both ends of the steel connection section extend outward from the reinforced concrete bridge pier; Step 3: pouring bridge pier concrete, and connecting the shear connectors provided on the surface of the steel structure of the embedded section with the bridge pier concrete; Step 4: After the concrete strength of the bridge pier reaches the requirement, the steel arch ribs are hoisted and aligned with the overhanging sections at both ends of the steel connecting section and welded.

Images