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My since 50 generation medium-term began built prestressed concrete beam bridge, has has has more than 40 years of history, than European started late, but near on years to development quickly, in prestressed concrete bridge of design, and structure analysis, and test research, and prestressed material and the technology equipment, and construction technology, aspects changing, prestressed concrete beam bridge of design technology and construction technology are has reached quite high of level.
Although China's prestressed concrete continuous beam in constant development, but with the international advanced level there is still a certain gap. To catch up with the international advanced level, we must solve the following questions:
1 the development of large tonnage anchorage and tension system, avoid excessive increases with the beam of box girder structure size, otherwise it is difficult to guarantee the protective layer of concrete, prestressed pipeline dense and reinforced layers stacked so difficult to improve the quality of concrete.
2 in all appropriate bridge site, design and construction of pier and beam of continuous rigid frame, using the least possible big tonnage support maintenance replacement is not easy.
3 give full play to the advantages of three prestressed, with long cantilever roof single box section, can save materials, reduce the weight of structure, but also can make full use of the cantilever construction method to speed up the construction progress.
In addition, in the design of prestressed continuous beam bridge, technical and economic index is a very key factor, it is the logo design scheme is reasonable and economic. At present, all the countries to three per square metre (wood deck concrete, prestressed, reinforced) amount and the cost per square metre bridge to represent economic and technical index of prestressed concrete bridge. However, the research and analysis of technical and economic indexes of bridge is a very complicated work, three material index and cost index, with many factors such as: the bridge site, hydrogeology, energy supply, material supply, transportation, navigation, planning, construction site conditions; construction of modernization, product, price, industrialization labor and material mechanical industrial base, national infrastructure conditions. At the same time, complete the design of a bridge, cost index can not only reflect the size of investment, but also should include the use of period of maintenance, repair and operating expenses. Through continuous beam, T type rigid frame, continuous rigid frame, the comparison of the structure of box section can be found: continuous rigid-frame structure with high technical and economic index system. Therefore, from this point of view, continuous rigid frame is the future development direction of one continuous system.
目录
1 序言 1
2 设计资料 3
2.1 工程概况 3
2.2 设计规范和标准 3
2.3 设计技术标准 3
2.3.1 设计荷载 3
2.3.2 设计车速 3
2.3.4 桥面横向布置 3
2.3.5 桥面坡度 4
2.3.6 结构抗震 4
2.3.7 规划河道断面图 4
2.4 基本资料 4
2.4.1 工程地质 4
2.4.2 场地水文地质条件 6
3 桥梁结构的总体布置和初步方案拟定 7
3.1 方案一：简支梁桥 7
3.1.1 设计思路 7
3.1.2 跨径划分和总体布置 7
3.1.3 上部主要结构尺寸拟定 8
3.1.4 下部主要结构尺寸拟定 8
3.1.5 标高计算 8
3.1.6 施工方案 9
3.2 方案二：T形钢构桥 9