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預应力鋼筋混凝土梁,在鉄路桥梁建設中应用极为广泛。我們在設計革命运动中曾重点解剖过这个項目的設計,发現了不少問題。現場对原設計的反映是“技术陈旧,质量不高”。为适应新綫建設大量需要預应力梁的发展形势决定立即修改这項設計。为了查明問题的“症結”所在,我們小组下現場之后,对預应力梁的生产工艺进行了广泛地調查。基本上摸清了設計中存在的主要問題。这些問題是:(1)张拉設备笨重且不安全;(2)管道形成方法陈旧(采用鉄皮管),且妨碍預制鋼筋骨架的应用(1964年铁道部虽然组織設計、施工、科研三方研究,初次較大規模地試用了抽管法形成管道工艺,但問題未得彻底解决),(3)梁端普遍存在裂縫(1964年試用成功底震工艺以后,虽有改善但未彻底解决);(4)桥面排水系統构
Prestressed reinforced concrete beams, Kushiro bridge construction is widely used. We have focused on the design of this project during the design revolution and found many problems. The scene of the original design reflects the “old technology, quality is not high.” In order to meet the new construction needs of a large number of prestressed beams the development situation decided to immediately modify the design. In order to find out the crux of the problem, a survey was conducted on the production process of prestressed beams after our team was on site. Basically find out the design of the main problems. These problems are: (1) Tensile equipment is bulky and unsafe; (2) Pipeline formation methods are obsolete (using pipe jacking) and hampering the application of prefabricated reinforcing steel skeletons (1964 Ministry of Railways, while organizing design, construction, research Tripartite study, the first large-scale trial of the pipe to form a pipe process, but the problem has not been completely resolved), (3) the beam end ubiquitous cracks (after the successful trial of bottom shaking in 1964, although the improvement has not been completely resolved ); (4) deck drainage system structure