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(一)前言涵洞是铁路建筑中使用最广的过水建筑物,而园形涵洞結構簡单,便于工厂制造和工地拼裝,因此使用更广。大家对其设计、制造、施工、养护等一系列问题都很重視。早在1958年,有关单位即进行了不少研究工作,1959年铁道部修訂桥涵設計規范村也放棄了过去採用卸力拱计算土压力的理論,而改按等沉陷层理論設计,並規定了各种涵洞的受力图式,使涵洞的設計較接近于实际。去年成都桥梁专业标准设計座談会決定由各設計院共同組成了一个涵洞調查研究小組,在全国七条錢路上进行了周密的实地調查。
(一) Foreword Culverts are the most widely used water-crossing structures in railway construction. However, the structure of circular culverts is simple in structure and convenient for factory construction and site assembly, so it is more widely used. We all attach great importance to its design, manufacture, construction and maintenance of a series of issues. As early as 1958, a lot of research work was carried out by relevant units. In 1959, the Ministry of Railways revised the code for design of bridges and culverts and gave up the theory of using earth pressure to calculate earth pressure in the past. Instead, A variety of culvert stress patterns, so that the culvert design closer to reality. Last year, Chengdu Bridge Professional Design Forum decided by the design institute jointly formed a culvert investigation team, in the country seven money road conducted a thorough fieldwork.