Stay cable device for kilometric cable stayed bridge and mounting method thereof

Abstract

The invention discloses a stay cable device for a kilometric cable stayed bridge, which comprises a first stay cable and a second stay cable which are located at the same cable position. The first stay cable is made of steel, and the second stay cable is made of a carbon fiber reinforced composite material; and two ends of the first stay cable and the second stay cable are fixedly connected with a bridge structure respectively by an anchor device. The stay cable device can effectively improve the mechanical property of the kilometric cable stayed bridge and reduce the cost. Meanwhile, the invention also discloses a mounting method for the stay cable device, which comprises the following steps: step 10) determining a section area proportion of the stay cable of the first stay cable and the second stay cable; step 20) determining a cable tension force of the first stay cable and a cable tension force of the second stay cable; step 30) anchoring the first stay cable and the second stay cable on the bridge; and step 40) arranging a connecting device between the first stay cable and the second stay cable. The mounting method can greatly reduce the self weight of hybrid cables and reduce a sag effect.

Description

technical field [0001] The invention relates to a cable-stayed device, in particular to a cable-stayed device for a kilometer-level cable-stayed bridge, and at the same time, the invention also relates to an installation method of the cable-stayed device. Background technique [0002] Since the first modern cable-stayed bridge was built in 1956, cable-stayed bridges have developed rapidly. Because the cable-stayed bridge has the advantages of high structural rigidity, convenient construction, and good economy, it has basically replaced the suspension bridge below 600 meters, and is also very competitive within the span of 600 to 1000 meters. The completion of the Sutong Bridge has brought the span of the cable-stayed bridge into the era of over one kilometer. Studies have shown that ultra-kilometre-scale cable-stayed bridges still have competitive advantages compared with suspension bridges in terms of mechanical properties and economics, so it can be expected that cable-st...

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Problems solved by technology

However, these areas are often on soft soil foundations with poor bearing capacity or poor geological conditions. It is extremely difficult to construct super-large-scale gravity anchorages, and the cost is very expensive, so it is not the best solution. bridge will be highly competitive

[0005] In order to further increase the span of cable-stayed bridges, the structure of traditional steel-stayed cable-stayed bridges is very difficult; CFRP is light, high-strength, and corrosion-resistant. It can be used as a cable-stayed cable material to solve the self-heaviness and sag effects of traditional steel cable-stayed cables. Obvious and poor durability, but its elastic modulus is low. Generally speaking, within the horizontal span of 2000m cable-stayed cables or the range of 4000m main-span cable-stayed bridges, even if the sag effect of CFRP cable-stayed cables is small, its equivalent stiffness is still Obviously lower than traditional steel cable-stayed cables, it is difficult to be directly applied in current kilometer-level cable-stayed bridges (1000~3000m main span)

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