Abutment Connection Structure and Construction Method of Integral Composite Girder Seamless Bridge

Abstract

The invention discloses an abutment connection structure of an integral composite beam seamless bridge and a construction method thereof. The abutment connection structure includes a controllable pre-stressing system, a connection system and a stiffening system arranged on the composite beam; the connection system It includes multiple vertical shear members and two sets of longitudinal shear members, the controllable pre-stressing system includes two sets of vertical steel bars, and the stiffening system includes end diaphragms and two inner vertical stiffeners; the abutment connection structure The construction method includes steps: 1. Pre-processing of components; 2. Binding of pile cap steel skeleton; Anchoring of the pre-stressing system; 7. Abutment concrete pouring; 8. Bridge deck concrete pouring. To sum up, the present invention is reasonable in design, easy in construction, good in use, excellent in mechanical performance, can realize seamless connection between abutment and main girder, and can effectively improve the stiffness of the joint between abutment and main girder.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to an abutment connection structure of an integral composite girder seamless bridge and a construction method thereof. Background technique [0002] In order to adapt to the expansion and deformation of the bridge, the general practice is to set up corresponding expansion joints and expansion devices at the junction of the main girder and the abutment on the pier. The expansion device is the weakest link in the bridge structure. Since the expansion device directly bears the repeated impact of the vehicle load, even if there is a small unevenness, it will be subject to a large impact under the vehicle load. The most vulnerable to damage and need repair replacement. Slight defects and deficiencies in design or construction will lead to early damage, which not only directly makes bridge passers-by feel uncomfortable and lacks a sense of security, but sometimes ...

AI Technical Summary

Problems solved by technology

The expansion device is the weakest link in the bridge structure. Since the expansion device directly bears the repeated impact of the vehicle load, even if there is a small unevenness, it will be subject to a large impact under the vehicle load. Most vulnerable to damage requiring repair and replacement

Slight defects and deficiencies in design or construction will lead to early damage, which not only directly makes bridge passers-by feel uncomfortable and lacks a sense of security, but sometimes also affects the normal use of the bridge structure itself

The reason for the general damage of the expansion device is that in addition to the increase in traffic flow and the increase in heavy vehicles (the impact effect is significantly increased), the design, construction and maintenance cannot be ignored. Moreover, the bridge deck has a sudden change in stiffness at the position of the expansion joint, and it is traveling at a high speed. Under the repeated action of vehicle load, its service life is seriously affected

Therefore, the vulnerability of bridge telescopic devices has always been a major problem in road traffic

However, since the expansion joints and expansion devices are canceled at the abutment of the integral composite girder seamless bridge, and the abutment and the main girder are made into an integral structure, compared with the concrete structure bridge, the stress at the connection between the abutment and the main girder changes. The structure is complex, and the concrete at the end of the steel girder is easy to crack, resulting in a decrease in the stiffness of the connection, which may not achieve the expected use effect of this type of bridge.

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