This invention relates to the field of
bridge engineering technology, specifically to a variable-height, large-span
hybrid beam cable-stayed bridge, comprising bridge towers, piers, main beams, and cables. The piers include side piers and auxiliary piers. The main beam comprises equal-height
concrete beams for the side spans, variable-height
concrete beams for the side spans, equal-height
concrete beams for the
tower area, a steel-concrete composite section, and equal-height steel beams for the middle span. The side span beams adopt a variable-height, large-span structural beam structure. This design effectively adapts to complex
terrain, reduces the number of auxiliary piers, lowers the
water resistance rate, facilitates navigation and
flood control, and saves investment. The self-weight of the side spans of the
hybrid beam cable-stayed bridge is significantly increased, eliminating the need for side span counterweights on the auxiliary piers to balance the load on the main beam in the middle span. It exhibits
high stiffness and small beam end rotation angles, which is beneficial for the smoothness of high-speed
train operation. The bridge employs symmetrical
cantilever construction using hanging baskets, and is constructed simultaneously with the bridge towers. The cast-in-place support erection area is small, making the construction application wide-
ranging, convenient, quick, economical, and significantly shortening the construction period. It also benefits
flood control and construction safety during the construction period.