Bridge bulk mass concrete skewback structure

Abstract

A bridge bulk mass concrete skewback structure has the advantages of being concise in structure, clear in stress, simple and convenient to construct, economical and reasonable, and can not only well meet the longitudinal and transversal stressing requirements of the skewback structure, but also simultaneously lower influence brought by heat of hydration and concrete shrinkage during construction process. The bridge bulk mass concrete skewback structure comprises a skewback (10) which supports and fixedly connecting a border pier (20) and an arch ring (30), and the whole of the skewback (10) is in a transversal uniform-section step shape and composed of a lower-portion plain concrete casting body (11) and an upper-portion reinforced concrete casting body (12). A transversal breaking joint (13) is arranged in the middle of the plain concrete casting body (11), and steel plates (14) are filled in the transversal breaking joint (13). The border pier (20) and the arch ring (30) are cast on the upper-portion reinforced concrete casting body (12).

Description

technical field [0001] The invention relates to a bridge, in particular to a large-volume concrete abutment of a large-span arch bridge suitable for crossing a "V"-shaped terrain in mountainous valleys. Background technique [0002] Arch bridge is an ancient bridge type with strong vitality. With the development of national economy and the rapid development of transportation, it is inevitable to build bridges in dangerous mountainous areas and river valleys. In such areas, the arch bridge type has advantages that cannot be surpassed by other bridge types. Regardless of whether it is an upwardly connected, centrally connected or downwardly connected arch bridge, the research and design of the abutment is an unavoidable big problem. [0003] The common abutment styles include cut and expanded foundation type, tunnel anchor type, and some special-shaped abutment styles. There are more or less problems with these different abutment styles. For open cut foundations, the top and...

AI Technical Summary

Problems solved by technology

For open cut foundations, the top and bottom of the foundation are mostly designed equally. This form of abutment is reasonable for arch bridges with small and medium spans, but there are many problems for large-volume abutments for long-span arch bridges: The actual stress characteristics and mechanism of the abutment are not clear, and it has entered the vicious circle of "too small bearing capacity - larger foundation - smaller bearing capacity", resulting in a great waste of masonry materials

In addition, the most prominent problem is that the heat of hydration and the shrinkage effect of concrete during the construction process are likely to form cracks. If some cracks extend to the arch ring, it will bring great safety hazards to the operation safety of the bridge.

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