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As China's economic development, materials, machinery, equipment industry relevant development, which is our long-span cable-stayed and suspension bridges built to provide a strong guarantee. Coupled with careful design and construction of the majority of bridge builders, so the level of the bridge has been awarded to the world advanced level. China's vast territory, levels of economic development, the overall level is not high on the economy, the development of roads and bridges, or to focus on large, wide surface is generally large, in the bridge, the bridge is still kind of prestressed concrete structures based. Among them, simply supported beam bridge design, simple construction, short construction period. But the bridge expansion joints are more poor driving conditions; midspan moment large pier top moment is zero, structural discontinuity reasonable; high beam only by cross-sectional moment of control, other cross-sectional material can not be fully utilized. Bracket situ continuous beam reasonable force, good driving conditions, but higher construction process requirements, need a lot of support, high construction costs; piers, abutments after all the construction in order to make the upper part of the construction, and therefore a longer duration. The perse nature of the various bridge type, so that we can be more suited to local conditions to choose which type of bridge, make a bridge to better serve people. Therefore, we should focus on grasping persification, standardization, preparation of standard figure applies economy, improve the level and quality of construction, and then grab across the river (River), large bay bridge construction, constantly sum up experience, not only embodies the human highway construction bridge level, but also to ensure high standards and quality bridge. Reform and opening up, the party's policies to enrich, change people's understanding, "To get rich, first build roads" has become a consensus to accelerate transportation infrastructure has become a people's initiative. Diversification of the national investment priorities and financing channels tilt for the development of roads and bridges has provided funding guarantee. Looking highway bridge development trends, cherish the opportunity to work creatively, to change the backward situation of China's highway construction, efforts to study and improve themselves, contribute to nation-building as a bridge.
The main contents of this design is the Suzhou Wuzhong District Tangqiao design. Design three bridge-type program, were simply supported beam bridge, T-shaped rigid frame bridge and prestressed concrete girder bridge, recommend solutions for simply supported prestressed girder bridge.
This bridge is 30 + 30 + 30 + 30 = 120m long. Girder using T-shaped cross section, such as the height of the beam height, the main beam of the prefabricated construction method. Piers are double-column pier, the foundation for the bored pile foundation. Rib assembly simply supported beam bridge can save a lot of templates bracket, shorten the construction period, accelerate the speed of the bridge, so widely used. Advantages fabricated T-beam bridge is to create a simple, holistic, easy fitting, is currently one of the most commonly used form of bridge structures. Bridge Deck: use 8cm thick waterproof as concrete pavement, plus 6cm of asphalt concrete wearing course, a total of 14cm thick. Main Bridge Pier Foundation adopts 12 φ = 1500 bored; thickness caps take 2.5m; in order to reduce the flow of water on the pier caps impact, the two caps transverse to the outer edges of the shape of an arc-shaped design The main bridge piers with double Shaft Piers.
Midas program calculates the constant use of live load and internal forces of the construction phase, and then a combination of internal forces, configure prestressed bridge beams calculated after the whole experience count to meet regulatory requirements. Assembling prefabricated construction methods.
Keyword：Simply supported T-beam; Prefabricated subassembly;