CN111996910A

CN111996910A - Fulcrum connection structure in steel-concrete combined continuous beam

Info

Publication number: CN111996910A
Application number: CN202010557164.XA
Authority: CN
Inventors: 马森; 王吉英; 张大伟; 郭卫民; 李爽; 陈建荣
Original assignee: Liaoning Institute Of Transportation Planning And Design Co ltd
Current assignee: Liaoning Institute Of Transportation Planning And Design Co ltd
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2020-11-27

Abstract

The invention discloses a middle fulcrum connecting structure of a steel-concrete combined continuous beam, which comprises a plurality of steel main beams which are longitudinally arranged in parallel, wherein the ends of the plurality of steel main beams are connected through a concrete middle cross beam which is transversely arranged; the bridge deck is arranged at the upper ends of the steel main beam and the concrete middle cross beam, and compared with the prior art, the bridge deck has the beneficial effects that: the steel girder is manufactured in a whole hole of a factory during construction, a concrete bridge deck is poured, a prefabricated steel-concrete composite beam is formed, the steel girder and the concrete bridge deck are transported to a construction site to be erected in a whole hole, all longitudinal splicing seams of the steel girder and the bridge deck are concentrated at a central fulcrum, a temporary support is not required to be arranged between a pier and the pier, the concentrated splicing requirements of the steel girder and the concrete bridge deck at the central fulcrum on the top of the pier can be met, the arrangement of the temporary support can be reduced, the labor cost and the consumption of building materials are reduced, and the concrete central beam can replace a traditional pier cover beam, so that the building materials are saved in a near step.

Description

Fulcrum connection structure in steel-concrete combined continuous beam

Technical Field

The invention relates to the technical field of a middle fulcrum connecting structure of a steel-concrete combined continuous beam, in particular to a middle fulcrum connecting structure of a steel-concrete combined continuous beam.

Background

The bridge construction refers to the process of building a bridge, and in the construction process, bridge structures such as a capping beam, a bridge middle fulcrum beam and the like need to be arranged at the upper end of a bridge pier, and in the past, a steel-concrete combined continuous beam generally adopts a structural form that a steel main beam and a reinforced concrete bridge deck plate continuously pass through at a middle fulcrum position, so that the structural integrity and the load transmission continuity are ensured; in a one-connection multi-span continuous structure, the continuous beam adopting the structure form has the advantages that a plurality of on-site splicing points must be arranged between the piers, a temporary support must be erected at each splicing point, a steel main beam is spliced by adopting a high-strength bolt or welding method during construction, and then a concrete bridge deck is poured or installed; when a plurality of main beams are transversely adopted, a reinforced concrete capping beam is required to be arranged on the top of a pier, a large amount of labor cost and building materials are required to be consumed for temporary measures adopted by the construction processes, particularly for a small-span bridge, the specific gravity of the bridge is higher, and therefore, the steel-concrete combined continuous beam middle pivot connecting structure is provided.

Disclosure of Invention

The invention aims to provide a middle fulcrum connecting structure of a steel-concrete combined continuous beam, which aims to solve the problems in the background technology.

A middle pivot connecting structure of a steel-concrete combined continuous beam comprises a plurality of steel main beams which are longitudinally arranged in parallel, wherein the ends of the steel main beams are connected through a concrete middle cross beam which is transversely arranged; the steel main beam comprises an I-shaped beam, a widened and gradual-change section is arranged at the end part of the lower flange of the I-shaped beam, an end plate is further arranged at the end part of the I-shaped beam, the end plate is embedded in the side surface of the concrete middle cross beam, and a plurality of shear nails are further arranged on the outer side surface of the end plate; the upper flange of the I-shaped beam is outwards provided with extension plates, the extension plates are inserted into the concrete middle cross beam, and the extension plates of two adjacent holes are connected with the splice plate through high-strength bolts in the middle cross beam;

the upper ends of the steel main beams and the concrete middle cross beams are provided with bridge decks, tensile steel bars are longitudinally arranged in the bridge decks, and the reinforcing bars of the tensile steel bars meet the requirements of relevant specifications on bending strength and crack resistance; the concrete middle cross beam is internally provided with stirrups which are designed according to the technical requirements of pier capping beams; the lower end of the concrete middle cross beam is connected with the pier base of the pier through a support.

Preferably, the width and the thickness of the end plate are larger than those of a lower flange of the I-shaped beam, so that the pressure bearing area of the expanded end plate is increased.

Preferably, the arrangement angle of the steel main beam and the concrete middle cross beam is 70-90 degrees, so that the steel main beam and the concrete middle cross beam are convenient to mount, and the structural stability after mounting is improved.

Compared with the prior art, the invention has the beneficial effects that:

the extension plates are inserted into the concrete middle cross beam, the extension plates of two adjacent holes are connected with the splicing plates in the middle cross beam through high-strength bolts, and share the tension part in the longitudinal negative bending moment with common steel bars in the bridge deck; the concrete middle cross beam bears the pressure part in the negative bending moment transmitted by the lower flange; the shear nails arranged on the end plates bear the vertical shear transmitted by the I-shaped beam web plates, and the widened transition sections can avoid overhigh compressive stress of the lower flanges, so that the end plates can enlarge the bearing area;

the steel girder is manufactured in a whole hole of a factory during construction, a concrete bridge deck is poured, a prefabricated steel-concrete composite beam is formed, the steel girder and the concrete bridge deck are transported to a construction site to be erected in a whole hole, all longitudinal splicing seams of the steel girder and the bridge deck are concentrated at a central fulcrum, a temporary support is not required to be arranged between a pier and the pier, the concentrated splicing requirements of the steel girder and the concrete bridge deck at the central fulcrum on the top of the pier can be met, the arrangement of the temporary support can be reduced, the labor cost and the consumption of building materials are reduced, and the concrete central beam can replace a traditional pier cover beam, so that the building materials are saved in a near step.

Drawings

FIG. 1 is a structural cross-sectional view of the present invention;

FIG. 2 is a cross-sectional view of the structure at A-A of the present invention;

fig. 3 is a perspective view of the steel girder of the present invention.

In the figure: 1. the bridge pier comprises a steel main beam, 11 parts of an I-shaped beam, 12 parts of a widening transition section, 13 parts of end plates, 14 parts of an extension plate, 15 parts of shear nails, 2 parts of a concrete middle cross beam, 3 parts of a bridge deck, 4 parts of stirrups, 5 parts of tensile reinforcing steel bars, 6 parts of a support, 7 parts of a pier seat.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: a middle pivot connecting structure of a steel-concrete combined continuous beam comprises a plurality of steel main beams 1 which are longitudinally arranged in parallel, the ends of the plurality of steel main beams 1 are connected through a concrete middle cross beam 2 which is transversely arranged, the concrete middle cross beam 2 bears the pressure part in the negative bending moment transmitted by a lower flange, and the arrangement angle of the steel main beams 1 and the concrete middle cross beam 2 is 70-90 degrees, so that the steel main beams 1 and the concrete middle cross beam 2 can be conveniently installed, and the structural stability after installation is improved; the steel main beam 1 comprises an I-shaped beam 11, a widening transition section 12 is arranged at the end part of the lower flange of the I-shaped beam 11, the widening transition section 12 can prevent the lower flange from having overhigh compressive stress, an end plate 13 is further arranged at the end part of the I-shaped beam 11, the end plate 13 can enlarge the bearing area, the width and the thickness of the end plate 13 are both larger than those of the lower flange of the I-shaped beam 11, the enlarged bearing area of the end plate 13 is improved, the end plate 13 is embedded in the side surface of the concrete middle cross beam 2, a plurality of shear pins 15 are further arranged on the outer side surface of the end plate 13, and the shear pins 15 bear the vertical shear force transmitted by the web plate of the I-shaped beam 11; the upper flange of the I-shaped beam 11 is outwards provided with extension plates 14, the extension plates 14 are inserted into the concrete middle cross beam 2, and the extension plates 14 of two adjacent holes are connected with a splice plate through high-strength bolts in the middle cross beam 2; after being connected, the bridge deck slab and the common steel bars in the bridge deck slab 3 bear the tension part in the longitudinal hogging moment.

The upper ends of the steel main beam 1 and the concrete middle cross beam 2 are provided with a bridge deck 3, tensile steel bars 5 are longitudinally arranged in the bridge deck 3, and reinforcing bars of the tensile steel bars 5 meet the requirements of relevant specifications on bending strength and crack resistance; the concrete middle cross beam 2 is internally provided with stirrups 4, and the stirrups 4 are designed according to the technical requirements of pier capping beams; the lower end of the concrete middle cross beam 2 is connected with a pier seat 7 through a support 6.

The working principle is as follows: when the steel girder erection device is used, the steel girder 1 is manufactured in a whole hole of a factory, the concrete bridge deck 3 is poured to form a prefabricated steel-concrete composite beam, the prefabricated steel-concrete composite beam is transported to a construction site to be erected in the whole hole, all longitudinal splicing seams of the steel girder 1 and the bridge deck 3 are concentrated at the middle branch point, and a temporary support does not need to be arranged between the piers.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a fulcrum connection structure in steel reinforced concrete combination continuous beam, includes the vertical parallel arrangement's of a plurality of steel girder (1), its characterized in that: the ends of the steel main beams (1) are connected through a transversely arranged concrete middle cross beam (2); the steel main beam (1) comprises an I-shaped beam (11), a widening transition section (12) is arranged at the end part of the lower flange of the I-shaped beam (11), an end plate (13) is further arranged at the end part of the I-shaped beam (11), the end plate (13) is embedded in the side surface of the concrete middle cross beam (2), and a plurality of shear nails (15) are further arranged on the outer side surface of the end plate (13); the upper flange of the I-shaped beam (11) is outwards provided with an extension plate (14), the extension plate (14) is inserted into the concrete middle cross beam (2), and the extension plates (14) of two adjacent holes are connected with a splice plate through high-strength bolts in the middle cross beam (2);

the bridge deck (3) is arranged at the upper ends of the steel main beam (1) and the concrete middle cross beam (2), tensile steel bars (5) are longitudinally arranged in the bridge deck (3), and stirrups (4) are arranged in the concrete middle cross beam (2); the lower end of the concrete middle cross beam (2) is connected with a pier seat (7) through a support (6).

2. The middle fulcrum connecting structure of the steel-concrete combined continuous beam according to claim 1, wherein: the width and the thickness of the end plate (13) are larger than those of the lower flange of the I-shaped beam (11).

3. The middle fulcrum connecting structure of the steel-concrete combined continuous beam according to claim 1, wherein: the arrangement angle of the steel main beam (1) and the concrete middle cross beam (2) is 70-90 degrees.