赣粤高速公路袁河特大桥50m预应力砼T梁现场预制施工技术.rar

50 m预应力砼T梁现场预制施工技术

　赣粤高速公路袁河特大桥主线中心里程K7 + 130, 全长716180 m, 上部结构为10 ×30 m + 4 ×50 m + 7 ×30 m先简支后连续预应力钢筋砼T型梁。下部结构为钻孔灌注桩基础, 双柱式墩台。设计荷载: 汽- 超20级, 挂120。该工程于2001年9月开工, 2003年6月竣工。50 m后张法预应力砼T梁(简称50 m T梁) , 目前在高速公路建设中应用不是十分广泛。为此, 本文仅就该型梁的现场预制施工技术和质量控制作一简单介绍, 供同行参考。
 1　50 m T梁的特点及主要技术参数
 111　50 m T梁的特点
50 m T梁相对其他结构形式梁具有结构简单, 砼用量小, 结构自重轻, 工程成本低, 便于现场预制, 施工进度快, 质量有保障等特点。
112　主要技术参数
50 m T梁高216 m, 顶宽211 m, 底宽015 m (端部底宽0172 m) , 腹板厚度0118 m, C50高强度砼, 每片T梁重140 t。每片T梁预应力筋6束。其中端跨梁1#钢束由9根, 2#、3#钢束由12根, 4# ～6#钢束由5根<15124 mm钢绞线组成; 中跨梁1#钢束由9根, 2#钢束由12根, 3# ～6#
钢束由5根<15124 mm钢绞线组成。钢绞线为高强低松驰度预应力钢绞线, 标准强度Rby = 1 860MPa, 单束设计最大控制张拉应力为0175Rby = 1 395MPa。
2　50 m T梁现场预制施工技术
211　预制场的选择与布置
本着“紧凑、经济、安全、畅通”的原则, 根据现场的实
50 m Prestressed Concrete T Beams Prefabricated Construction Technology

Gan Yuan Yue Expressway Centre River Bridge main line mileage K7 + 130, length 716180 m, the upper structure 10 × 30 m + 4 × 50 m + 7 × 30 m simply supported continuous prestressed concrete T-beam. Substructure for the bored pile foundation, two-column pier. Design load: Steam - Super 20, hanging 120. The project started in September 2001, completed in June 2003. 50 m post-tensioned prestressed concrete T beam (50 m T beams for short), is applied in the highway construction is not very extensive. Therefore, this article only in respect of the beam spot prefabricated construction technology and quality control to make a brief for the peer reference.
 1 50 m T beam characteristics and main technical parameters
 111 50 m T beam characteristics
50 m T beam relative to other structure beam has a simple structure, concrete amount is small, light weight structure, engineering, low cost, easy on-site prefabricated, fast construction progress, quality, secure and so on.
112 Main technical parameters
50 m T beam height 216 m, top width of 211 m, bottom width 015 m (end of bottom width 0172 m), web thickness of 0118 m, C50 high-strength concrete, each piece of T beam weight 140 t. Each beam T beam tendons 6. One end of a cross-beam steel beam from the 9 #, 2 #, 3 # steel beam from the 12, 4 # 6 # steel beam from the 5 <15124 mm strand composition; in the cross-beam steel beam from 9 1 # root, 2 # steel beam from the 12, 3 # 6 #
Steel beam from the 5 <15124 mm steel wire form. High-strength low-relaxation strand as the degree of prestressing strand, standard strength Rby = 1 860MPa, the maximum control of a single beam design tensile stress for the 0175Rby = 1 395MPa.
2 50 m T Situ Beam Technology
211 pre-market selection and arrangement of
The spirit of "compact, economy, safety, and smooth" principle, according to the real site