Transversely-widening splicing structure of three-dimensional prestress concrete continuous box girder bridge

Abstract

The invention discloses a transversely-widening splicing structure of a three-dimensional prestress concrete continuous box girder bridge. While flange plates of a new box girder and an old box girder are kept separated, the new box girder and the old box girder are connected by adding transverse reinforcing ribs which are longitudinally arranged at intervals. The whole transversely-widening splicing structure comprises the old box girder, the new box girder, the transverse splicing reinforcing ribs, longitudinal splicing seams, rubber belts, anchoring bolts and bridge surface laying layer, wherein the rubber belts, the anchoring bolts and the bridge surface laying layer are arranged on the longitudinal splicing seams. The transversely-widening splicing structure is characterized in that the transverse splicing reinforcing ribs are arranged between webs of the new box girder and the old box girder at certain intervals so that a new main beam and an old main beam can be connected together; meanwhile, the flange plates of the new box girder and the old box girder are separated, and the plate type rubber belts are laid on the separation seams. The plate type rubber belts are fixed to the flange plates through the bolts, and the top faces of the rubber belts are flush with the bridge surface laying layer. By means of the transverse splicing method, the defect that three-dimensional prestress concrete box girder flange plates can not be removed is overcome, the problem caused when the ribs are transversely planted at the ends of the flange plates is solved, and the purpose of transverse splicing of the three-dimensional prestress concrete continuous box girder bridge is well achieved.

Description

technical field [0001] The invention belongs to the technical field of bridge structures and relates to a transverse widening project suitable for three-way prestressed concrete continuous box girder bridges in ordinary highway bridges and urban overpass bridges. Background technique [0002] In recent years, with the rapid development of our country's economy, the flow of people and materials has become increasingly frequent, and the rapid increase in traffic volume has put forward higher and higher requirements for the capacity of road engineering in our country. The road bridges built in recent years have experienced traffic congestion to varying degrees after several years of service. Therefore, while building new roads, the country is also vigorously carrying out reconstruction and expansion of existing road bridges to improve the traffic capacity of existing roads and meet the continuous growth demand of transportation. In the past ten years, my country has achieved r...

AI Technical Summary

Problems solved by technology

[0004] 1) After splicing, the old bridge flange slabs tend to fail to meet the load-bearing capacity requirements. It is necessary to plant bars on the bottom of the old bridge flange slabs in a large section, and then pour large-area bottom slab concrete, which significantly increases the difficulty and workload of construction;

[0005] 2) The number of locally planted bars at the end of the flange plate of the old bridge is very small, and it is easy to affect the anchorage state of the surrounding transverse prestressed steel bars during construction;

[0006] 3) The upper and lower lap joints of the flanges can easily lead to unclear structural stress, which makes calculation analysis and structural design very difficult, which is detrimental to the long-term performance of the structure

[0007] It can be seen from the analysis that the existing splicing methods for the lateral widening of three-way prestressed concrete box girder bridges still have deficiencies. The method of lateral widening and splicing cannot be implemented. At the same time, there are still many problems in the horizontal splicing scheme of the existing three-way prestressed concrete continuous box girder bridge, such as unclear structural force, difficult implementation, etc., and it is difficult to meet the objective needs of the horizontal splicing of highway bridges.

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