Key Technology for the Construction of Ultra-High Cable Tower of Hanjiang River Grand Bridge on Xi'an-Shiyan Railway
The span arrangement of the new Hanjiang Grand Bridge on Xi'an-Shiyan Railway is(67+70+73+420+73+70+67)m cable-stayed bridge+2×32 m simple supported beam.The two tower structures are the same,both of which are H-type cable tower design with tower height of 186.5 m.The rectangular section of single box and single cell is adopted.The construction of cable tower is characterized by difficulty in the construction of upper and lower beams,difficulty in positioning and strengthening of embedded components such as cable conduit,difficulty in measurement of cable tower alignment,etc.Through the development of research on key technologies of construction of ultra-high cable tower,the temporary bracing and pulling technology of cable tower,cast-in-place technology of high-altitude assembly bracket of upper and lower beam,precise positioning and strengthening technology of cable conduit and linear control technology of cable tower construction are formed.It achieves the smooth construction of ultra-high cable tower,improves the construction quality,and accumulates valuable experience for the construction of similar ultra-high cable tower and pier column in the future.
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