利用竹材修建涵洞,在1949年以前,湖南有很多路线就曾采用了这种做法,迄今已20余年,可是当时很少去检查总结推广。1958年全省进行路况调查时,经了解除个别进出水口处,因受外界自然力的侵蚀,稍有损坏外,一般都很完好。以前的做法,普遍是依照陈规办事,最大的孔径是30公分,从未超出这个范围。解放以后,其标准虽曾加以修改,但孔径仍在50公分左右。1953年至1955年间,我省在修建永大和大慈公路时,有些平原地段,石料木材均较困难,过水面积又须要大,为了争取时间(当时是发动民工修路),曾大胆试做了 Bamboo was used to construct culverts. Before 1949, there were many routes in Hunan that used this approach. It has been more than 20 years ago, but it was seldom examined and summed up at that time. When the province conducted a traffic survey in 1958, it was generally in good condition after it was relieved of some entrances and exits. Due to the erosion of external forces of nature, it was slightly damaged. The previous practice, generally in accordance with the rules and regulations, the largest aperture is 30 cm, never beyond this range. After the liberation, although its standards have been modified, but the aperture is still about 50 cm. Between 1953 and 1955, some plains, stone and timber were more difficult to construct in Yongda County and Daci Road in our province, and the water area required was large. In order to gain time (at that time, it was initiated by migrant workers)