Upper-lower double-layer cellular composite folded web box girder

Abstract

The invention discloses an upper-lower double-layer cellular composite folded web box girder and relates to the technical field of bridge engineering. The upper-lower double-layer cellular composite folded web box girder includes a pier, a center beam, a box beam roof, a bottom plate of box girder, folded steel webs and horizontal braces. The center beam is fixedly arrange at that top of the pier,the top of the center beam is fixedly supported in the middle of the top plate of the box girder, two box girder bottom plates are symmetrically arranged on both sides of one end of the center beam near the pier, and the bottom plate of the box girder inclines and extends to the top plate of the box girder. One end of each box girder bottom plate is fixedly connected with two opposite folded steel webs, the other end of the folded steel webs is fixedly connected with the top plate of the box girder, one side of the folded steel webs is fixedly connected with the center beam, and two ends of the horizontal braces in transverse direction are fixedly connected with two folded steel webs on both sides of the horizontal braces respectively. The upper-lower double-layer cellular composite folded web box girder can better solve the problem of buckling stability of the long-span folded steel web, improve the span of the combined folded web box girder bridge, and enable the combined folded webbox girder bridge to give full play to its advantages.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to an upper and lower double-layer cell combined belly-folded box girder. Background technique [0002] Composite folded-web box girder is a steel-concrete composite structure developed and improved on the basis of prestressed concrete box girder. The folded steel plate has the characteristics of high shear buckling strength and no resistance to longitudinal axial force. Using it as the web of the concrete box girder not only meets the mechanical performance requirements of the web, reduces the self-weight of the box girder, but also improves the efficiency of prestressing; In addition, during the construction, a large number of brackets, formwork and concrete pouring process are reduced, and complex work such as binding steel bars for the web is omitted, thereby facilitating construction, shortening the construction period, and reducing costs. The composite folded-web b...

AI Technical Summary

Problems solved by technology

[0003] Composite folded-web box girders are about 20% lighter than ordinary concrete box girders. At the same time, combined folded-web box girders have the advantages of high prestressing efficiency. Theoretically, folded steel web girder bridges can achieve more Large span, the ultimate span can reach 400m, and the maximum span of the built composite box girder bridge with folded belly is 160m, which is far from the maximum span of 300m of the built concrete web beam bridge, let alone the composite folded belly The ultimate span of the box girder bridge, the self-weight of the box girder structure and the buckling stability of the folded steel web are the main factors restricting the span increase of the combined folded web box girder bridge

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