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To sum up, the prestressed concrete Bridges so has strong competitive ability in nearly 30 years, the main factors are:
1、Characteristics of prestressed concrete takahashi materials into full play, reliable strength, stiffness and crack resistance. Structure in the vehicle operating noise is small, small maintenance workload.
2、Construction method of prestressed concrete Bridges has reached a quite advanced level, the application of modern technology has made it greatly shorten the construction cycle, shows a huge economic benefits.
3、Prestressed concrete bridge is applicable to all kinds of structural system, but also in constantly to create the prestressed technology characteristics of new structure system, and its applicable scope is big, strong competitiveness.
4、Prestressed concrete bridge can take full advantage of the characteristics of material plasticity, in construction has rich and colorful performance potential, are more likely to achieve coordinated with surrounding environment in the form of concise and beautiful, realize the unity of the economy and beauty.
The bridge to the main hole 120 m span across three variable cross-section continuous girder bridge, the box section beam, the side span and middle span span ratio (0.5 ~ 0.7) : 1, combined with cantilever construction requirements, the edge across a span of 65.5 m. In front of the upper structure adopt box cross section, has been in the side span and across the span, for two separate bridge span structure, every single bridge with single box single chamber of box section beam. For deformation height curve continuous beam bridge, the support beam high access H = 7.5 m, span across the centre sill in the high access, H = 3 m beam bottom curve: From cooperate with cross section internal force of and beautiful side, selects the quadratic parabola beam bottom curve.Bridge deck pavement: choose 70 mm thick reinforced concrete as the surfacing layer, waterproof layer 1 mm, with 90 mm of asphalt concrete wearing layer, a total of 161 mm thick. 24 the root is used for the main bridge main pier foundation of phi 1000 bored piles; Cap thickness of 2 m, the bridge piers with double column pier shafts.
The whole bridge is symmetrical is pided into 80 units, computer program is used to calculate the constant live load and internal force of each construction stage. After and combination, the internal force calculation of whole bridge prestressed beam configuration, experience can meet the specification requirements.
Full framing construction methods adopted.
【 key words 】 continuous girder bridge; Box section; Full framing construction; Prestressed concrete.
目录
1 序言 1
2 设计资料 2
2.1 工程概况 2
2.2 设计规范和标准 3
2.3 设计技术标准 3
2.4 材料规格 3
2.5 工程地质 3
2.6 场地水文地质条件 4
3 方案比选 4
3.1 方案选取及尺寸拟定 4
3.1.1 65.5 +120+65.5m的变截面箱型连续梁桥 6
3.1.2 跨4×63m等截面预应力砼连续刚构梁桥 6
3.1.3 4×63m双塔斜拉桥 7
3.2 各方案主要优缺点比较表 8
3.2.1 设计思路 9
3.2.2 跨径划分和总体布置 9
3.2.3 上部主要结构尺寸拟定 10
3.2.4 下部主要结构尺寸拟定 10
3.2.5 标高计算 10
3.2.6 施工方案 10
4 主要材料及桥梁整体布置 10
4.1 主要材料 10
4.1.1 混凝土 10
4.1.2 预应力钢索 10