The Structure Design, Construction Technology Of Continuous Rigid-Frame Beam Bridges

Continuous rigid-frame beam bridges is a combination of beam and rigid frame bridge system, Continuous rigid-frame beam bridges is characterized by main beam continuous, pier beam consolidation, Not only maintained a continuous beam without joints, smooth traffic advantages, but also maintained a T-shaped rigid frame with no support, no need to convert the construction's system advantages, facilitate the construction, and a greater bending stiffness to the along-bridge and torsional rigidity to the cross-bridge can be to meet long-span bridge's the greater demands of power. So continuous rigid-frame beam bridges is a very viable form of a bridge structure, as a bridge type of Preferred choice for the large-span prestressed concrete bridge.Continuous rigid-frame beam bridges with a large number of construction, continuous rigid-frame beam bridges trend towards the development of the following:1. Span could be further increasedAt present, China's construction of the continuous rigid frame bridge the boom is continuing, the 280m span of the design Fengjie Changjiang River Bridge is under way. Hengmen Lingdingyang channel in the bridge project in China Eastern, there have been 318m long-span continuous rigid-frame of the program. It can be expected in the near future, more than 300m long span continuous rigid- frame bridge is bound to occur in China.2. Continuous light of the upper structureStructure of the light, the whole structure can reduce the weight and materials consumption, can reduce the demands on the basket. As a result of the use of large-tonnage anchor, high-strength concrete and lightweight concrete, the upper structure of continuous light, which is continuous rigid-frame bridge development.3. Simplified type of prestressed StrandChina's continuous rigid-frame bridge design, there are a considerable number bridge cancel Bend beam and continuous beam, vertical prestressed and along beam prestressed to overcome the principal tensile stress, which greatly facilitates the construction, the construction sector are welcome. 4. Cancel the landing support of edge span's connectionUse the appropriate edge span and main span ratio, while close up in the guide cross-beam, or cantilever of approach bridge is connected to achieve closure. Occasions in the high pier, the cancellation of landing a certain degree of cost-effective, facilitate the construction.5. The length of the upper part of the structure for the developmentDue to the improvement of the traffic speed, people will be comfortable moving to an important position. Abroad the upper part of the structure is strongly increasing the length of the continuous in the bridge design, rise to a "do not have the use of expansion joints or expansion joints is the best" point of view. China's designers also noted the trend of development, in the design some measures taken into consideration, in conditions appropriate to the circumstances of the continuous rigid-frame bridge, its continuous length can be developed for the 1200 ~ 1500m.In this paper, the focus of Hangzhou to the Lanzhou Highway Route Yunyang to Wanzhou the Yueliangbao bridge the upper part of the structure calculation and finite element analysis, focused on the construction change process of continuous rigid-frame bridge systems.The main work in this article:1. In this paper, a more detailed introduction to the current row - rigid frame bridge structure analysis is widely used in finite element method, at the same time introduced continuous rigid-frame bridge on the role of the external load, the internal force calculation. For hyperstatic rigid-frame bridges, concrete shrinkage and creep, temperature change, the role of pre-stressed and pier basis uneven shift would give rise to secondary reaction, resulting internal secondary forces. These internal secondary forces of hyperstatic rigid-frame structure is effect to the internal force larger, more detailed introduction to this paper, the above method of calculating internal force.2. Prestressed concrete continuous rigid-frame bridge is mainly applied to the situation of high pier and long-span, for continuous rigid-frame bridge design should pay special attention to the proportion of the spans, box-section drawn up, the internal temperature forces, transport crash, structural analysis issues such as a detailed exposition; As a result of continuous rigid-frame bridge design and construction process are interrelated and inseparable, to the continuous rigid frame bridge the various construction methods and attention to matters described. In particular, the various ways of edge span's connection is described.3. The focus of Hangzhou to the Lanzhou Highway Route Yunyang to Wanzhou the Yueliangbao bridge the upper part of the structure calculation and finite element analysis, focused on the construction change process of continuous rigid-frame bridge systems. Proposed the use of uneven length of cantilever casting of cast-in-place construction technology, for high pier and large-span continuous rigid-frame bridge, the construction technology of the abolition of the landing support of edge span's connection is great superiority.In this paper, the various factors of the construction and traffic phases on the prestressed concrete continuous rigid-frame bridge system, the impact of a more comprehensive analysis, in view of high pier and large-span continuous rigid-frame bridge, from the security, economic and efficient proposed the use of uneven length of cantilever casting of cast-in-place construction technology. Research project on the future of the prestressed concrete continuous rigid-frame bridge structure design and analysis, construction is more important guiding significance and reference value. Yueliangbao bridge construction has been successfully completed, Construction unit is good feedback.With the great development of transport, especially since the reform and opening high-grade highway construction the rapid development, the indicators on the request line, cost and route environment, with increasingly improved, a number of reasonable, economic, aesthetic form of a bridge structure has been studied and introduction and development. High pier and large span prestressed continuous rigid-frame bridge as a result of its unique advantages will be widely used.