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目前新建铁路上的拱涵,均按专桥5000石及混凝土拱形涵洞标准图施工。经过几年来的使用实践,发现大孔径拱涵拱圈开裂情况不少,有的纵贯全涵,裂縫宽达0.1～12mm,最后不得不采用压浆、增加套拱等加固措施。旣浪费了材料,增加施工麻烦,又给使用上带来不方便。一年多宋在××线施工处理中,我们遵照伟大领袖毛主席关于“要认真总结经验”,“实践、认识、再实践、再认识”的敎导,对拱涵作了初步统计和调查。现将调查情况及个人看法叙述如后,希望能起到拋砖引玉
At present, arch culverts on the newly built railway are all constructed according to the standard drawings of the 5000-hectare concrete arch bridge and concrete culvert. After several years of practice, it was found that there are many cracks in the arch ring of the large-pore arch culvert. Some of them are longitudinally full culverts and the cracks are as wide as 0.1-12 mm. In the end, they have to adopt grouting and increase the arching and other reinforcement measures.旣 waste of materials, increase construction problems, but also to bring inconvenience to use. More than a year Song in the construction of × × line, we follow the great leader Chairman Mao on “to seriously sum up experience”, “practice, understanding, re-practice, re-understanding,” the guidance of the arch culvert made preliminary statistics and investigation . Now the investigation of the situation and personal narrative as described later, hoping to play a valuable role