Double-layer highway bridge with integrated upper beam on frame mound and beam of polycarbonate (PC) continuous box girders

Abstract

The invention relates to a double-layer highway bridge with integrated upper beam on a frame mound and diaphragm of polycarbonate (PC) continuous box girders. Two layers of PC continuous box girders are arranged on the frame mound of the double-layer highway bridge, an upper-layer base and a lower-layer base are arranged on the frame mound of the double-layer highway bridge, and an upper-layer PC continuous box girder on the upper-layer base is integrated with the beam on top of the frame mound. The double-layer highway bridge omits the beam on top of the frame mound, and the beam on top of the frame mound is integrated with the diaphragm of PC concrete box girders. A structure in which the diaphragm of the upper-layer PC continuous box girders is integrated with the beam on top of the frame mound is a prestressed reinforced concrete structure, the length of the structure is equal to the width of a frame mound cross bridge, and the structure runs through the whole bridge width transversely. The double-layer highway bridge greatly reduces the overall building height of a bridge, reduces self-weight, reduces stress on the lower-portion structure, and improves distortion effect of the PC continuous box girders. Sight lines of driving staff on a lower-layer bridge surface are wide and comfortable, and the double-layer highway bridge can be constructed independently and is low in construction cost.

Description

technical field [0001] The invention relates to a double-deck highway bridge in which a cross girder on top of a frame pier and a PC continuous box girder transverse girder are combined into one. Background technique [0002] In the bridge structure, the pier is a building that supports the bridge span structure and transmits live loads such as dead loads and vehicles to the ground. Bridge piers are very important components of bridge structures. [0003] With the economic development and the increasing traffic volume, more and more double-deck highway bridges are built among highways and urban bridges, and the basic span of the bridge structure is about 30-40m. The piers of double-layer bridges not only support the two-layer bridge spans at the same time, but also must meet the clearance requirements of the upper lanes and sidewalks of the lower bridge spans to ensure the safety and smoothness of vehicles and pedestrians. Most of the girders are PC cast-in-place continuou...

AI Technical Summary

Problems solved by technology

In addition, in addition to bearing the upper load, the pier itself is heavy, and the vertical and horizontal force of the double-deck bridge is large, so the pier after heightening is not good for the force.

The loads of the two-story bridge spans are transmitted to the pier columns through the beams, the frame effect of the transverse bridge direction is obvious, and the pier columns bear a large transverse bridge bending moment, which will lead to an increase in the scale of a single foundation or an increase in reinforcement

For the users of the lower bridge deck, the messy frame beams not only encroach on the driving clearance, but also affect the visual experience of drivers and passengers

Images