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一、概况1966年,我县开始搞变截面刚架桥试点。起初在粘土地基上进行,采用现场浇筑方法施工。后来扩大到沙土地基,采取预制拼接方法施工,并不断改进桥型,最后设计了无桥台变截面刚架桥。目前,全县已建成变截面刚架桥80多座,其中建于排涝河及大沟上的有60多座。最大的桥长90米,桥梁跨度有4、5、6、8、10、12、15、18米。桥面宽度有3.3、4.4、5.0、8、0米,荷载等级有汽-6、汽-8、汽-10、汽-15。工程造价比普通的板梁桥及拱式桥低25%左右,经多年使用,情况正常。(新汽—10农桥图见78页后的插页图)
First, an overview In 1966, my county began to engage in cross-section rigid frame pilot. Initially carried out on clay foundations, using on-site pouring construction method. Later, it was expanded to sandy soil foundation, the precast splicing method was adopted, and the bridge type was continuously improved. Finally, a bridge without bridge abutments was designed. At present, the county has built more than 80 variable-section rigid frame bridges, of which more than 60 were built on drainage ditches and ditches. The largest bridge is 90 meters long, the bridge span 4,5,6,8,10,12,15,18 meters. Deck width of 3.3,4.4,5.0,8,0 m, the load level of steam -6, steam -8, steam -10, steam -15. The construction cost is about 25% lower than ordinary girder bridges and arch bridges. After years of use, the situation is normal. (Xinqi-10 Lunqiao Figure see the insert page after 78)