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一、概述目前,我国公路正面临着提高等级、增加载重的形势。干线公路的旧桥加固、改造、提高等级已迫在眉睫。据1979年全国公路桥梁普查资料,全国共有大、中型双曲拱桥4085座,约35万延米,占大、中桥总长的25.7%,占大、中型拱桥座数的43.3%。这些双曲拱桥中14%是差的和较差的。据调查,建造在水网地区软弱地基上的双曲拱桥,不少处于“带病工作”状态。1984年江苏省的公路桥调查,全省公路干线桥梁共2349座,计87,851.8延米,其中双曲拱桥841座,计37,746.6延米,占全省公路干线桥梁总长的43%。1984年南通地区公路干线双曲拱桥抽样调查结果,尚好的占41.6%,一般的占45.8%,险桥占
I. Overview At present, our country roads are facing the situation of raising the grade and increasing the load. The old bridge trunk highway reinforcement, transformation, to enhance the level is imminent. According to the 1979 National Highway and Bridge Census, there are 4,085 large and medium-sized double-curved arch bridges nationwide, about 350,000 meters long, accounting for 25.7% of the total length of the large and medium bridges and 43.3% of the total number of large and medium-sized arch bridges. 14% of these double-curved arch bridges are poor and poor. According to the survey, many double-curved arch bridges constructed on soft foundations in the water network are in a “sick working” state. In 1984, the survey of highway bridges in Jiangsu Province showed that the number of highways and bridges in the province totaled 2,349, accounting for 87,851.8 meters, of which 841 were double curl bridges, accounting for 37,746.6 meters, accounting for 43% of the total length of the bridges in the province. In 1984, the sample survey results of the double-curved arch bridge of the highway in Nantong area showed that 41.6% were still good, 45.8% in general,