Construction technology of superstructure of main bridge of Cuijiaying Hanjiang super large bridge of Han Shi high speed railway Zhou Gongjian 1,2 (1
The superstructure construction adopts the method of beam before arch
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State Key Laboratory of bridge structure health and safety, Wuhan, Hubei 430034; 2
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The O section of the main beam is poured in layers by using the bracket
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China Railway Bridge Bureau Group Co., Ltd., Wuhan, Hubei 430050) Key points: the main bridge of Cuijiaying Hanjiang River Super Major Bridge of newly-built Wuhan Shiyan high-speed railway adopts (135 + 2 × 300 + 135) m continuous rigid frame flexible arch composite bridge, the main beam is C60 prestressed concrete structure, and the arch rib is concrete-filled steel tubular truss arch
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The suspension pouring of other sections adopts the three main truss hanging basket and is equipped with a self-propelled modular inner platform for construction, and the balance weight is set on the cantilever of the side span side T-structure; First close the side span, then use the large tonnage jack synchronous jacking technology to realize the simultaneous closure of double main spans, and use the pneumatic auxiliary method to thread the super long prestressed tendon of the main beam; The main arch rib is first assembled at the low level of three sections on the bridge deck by assembly floating crane, and then the middle large section is lifted synchronously for closure; The side arch is assembled in situ by the bridge deck truck crane support method; C50 micro expansive concrete in arch rib chord, flat joint plate and batten plate shall be injected by secondary pumping, and then suspenders and auxiliary structures shall be constructed symmetrically..
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