History of National Highway 204

Yantai-Shanghai Highway is the main national highway in the north-south direction in the eastern coastal area of China. Depart from Yantai, pass through Fushan, Qixia, Laiyang, Laixi, Jimo, Laoshan, Jiaozhou, Jiaonan, Rizhao, Ganyu, Lianyungang and Guannan, and arrive in Shanghai. Qingdao 2 14. 1 km, the roadbed width is generally 8 ~ 14 m, and it crosses the urban section for 24 ~ 30 m, both of which are high-grade and sub-high-grade pavements. The pavement height is generally 7 ~ 12 m, and the urban section is 22 ~ 28 m. Traffic flow/kloc. Qingdao section of National Highway 204 is formed by merging four provincial roads, namely Yantai to Qingdao (Island), Qingdao to Shijiazhuang (Island), Jinan to Qingdao (Island) and Jiaozhou to Xinxiang (Hailian). It is 72.2km from the junction of Laiyang and Laixi to the east section of Jimo, which was originally a section of Yanqing Line in China. It is 7.7 kilometers from Dongcheng to Chengyang, which is the starting point of China Qingshi Line. Chengyang to Jiaozhou is 34.3 kilometers, which is a section of Qing Ji Line. Jiaozhou is 99.9 kilometers from Jiaonan to Rizhao, which is the northern section of Jiaoxin Line.

All sections of Qingdao National Highway 204 were originally simple highways built on the basis of old streets in the 1920s and 1930s. When it was first built, the line was winding, the roadbed was 4 ~ 6 meters wide, and there was no road surface. Only one wooden bridge was built on the Dagu River. During the second Japanese occupation of Qingdao, some sections from Chengyang to Jiaozhou were paved, and the Daguhe wooden bridge was transformed into a cement concrete overflow bridge. In the early 1940s, the highway section from Jiaozhou to Wanggezhuang was renovated. The roadbed width reached 7 meters, 59 bridges, culverts and waterways were built, and the Huangshanling Pass was opened. However, the road slope was as high as 14%, making driving very difficult.

After the founding of the People's Republic of China, more than 40 subgrade realignments, subgrade widening, bridge and culvert matching and asphalt pavement construction have been carried out.

1950 In the first half of this year, the subgrade widening project from the junction of Laiyang and Laixi to the east of jimo city was completed, with a width of 9 meters. 195 1 The bridge and culvert construction will be completed in the first half of the year, and the mud-bound macadam bearing layer will be paved in the second half of the year, with a width of 3.5 ~ 5m and a thickness of 20cm. This is the first large-scale highway reconstruction project in Qingdao after the founding of the People's Republic of China. After this reconstruction, the bend radius of this section is more than 50 meters, and the bridge and culvert load reaches 15 tons, reaching the third-class highway standard. 1956 The section from Dongcheng to Chengyang was widened and rebuilt, and the subgrade width reached 6.5m.. In the second year, a graded pavement with a width of 5 meters and a thickness of 20 centimeters was laid, which made it open to traffic rain or shine.

1959 Further open the Huangshan Pass, change the route and reduce the slope by 3.5 kilometers. The Huangshanyakou moved westward15m, and the excavation depth was 9m, with the north slope dropping to 5.2% and the south slope dropping to 4.7%. In the same year, the line was changed from Wanggezhuang to Zhangjialou, and the width of the line base was newly changed to 10 m, and bridges and culverts were built to 1 1 seat. 1960, the subgrade from Yangheya to Wanggezhuang section is widened to 8.5m.. By 1966, the subgrade realignment of Yangheya, Jiaocheng, Jiongguan, Fengjiacun, Zhou Jiacun, Liushudi and Xiaochang villages and the beach subgrade realignment project from dongjiacun to Song Jialing have been completed successively, with a total realignment of15.73km, subgrade width of10m and gravel grading. 10 meter, four new flood discharge works with 844 meters, culverts 18 roads with 477.9 meters, two small bridges with 53. 1 meter, and slope protection 1 193 meters. At the same time, the 34 km rerouting project from Chengyang to Jiaozhou was completed.

During 1969 ~ 1973, asphalt pavement will be carried out in stages from the junction of Laiyang and Laixi to Chengyang section and from Chengyang to Jiaozhou section. The asphalt pavement is 6 ~ 8m wide and 2 ~ 3cm thick, with a mileage of 1 14.2km, accounting for 53.3% of Qingdao's total mileage. 1May, 974 to1May, 979, JIAOZHOU to the junction of Jiaonan and Rizhao, 98.5km of asphalt pavement was laid in stages. The bottom layer is gravel and marl, with a width of 7.5 ~10m and a thickness of16 ~ 33cm, and the surface layer is 7 ~ 9m wide and 3cm thick. In 1970s, renovation projects were carried out, such as renovation of Nanwan Village, widening of subgrade from Jiaozhou to Wanggezhuang, widening of subgrade from Wawu to Zhujiazhuang, widening of subgrade from Niuxing to Tangjiazhuang, renovation of subgrade in Mojiazhuang Village and widening of subgrade from Tangjiazhuang to Boli, with a length of 5 1. 1km. Generally, the subgrade is widened by 8-65,438+.

1980, excavate the south slope of Huangshan Mountain, and implement the 7 km subgrade realignment project from Xiaomawan to Lijiahe. 198 1 ~ 1985 carried out the subgrade reconstruction and expansion of the third bid section from Zhuangyuan to Taoyuan, the subgrade reconstruction and expansion of the new (Zhuang) small (Beijing) line, the subgrade reconstruction and expansion of the section from Bolixi River to Zhou Jiacun, and the subgrade reconstruction and expansion of Majiatan by 22. 1 km, and the subgrade widened to/kloc. During this period, the section from the junction of Laiyang and Laixi to Chengyang was completely resurfaced with asphalt pavement and kerbs installed according to normal operation procedures, with a general section width of 8 meters. The road sections in Laixi and Jimo urban areas have been widened and reconstructed again. The width of subgrade reaches 24 ~ 30m, and there are isolation belts on both sides. The fast and slow cars drive separately, reaching the first-class highway standard. Laixi City is 5 kilometers long and jimo city City is 4.6 kilometers long. From Chengyang to Jiaozhou, after the subgrade adjustment and transformation is completed, the asphalt pavement will be resurfaced in stages, with a lime soil base layer with a width of 13m and a thickness of 30-35cm or gravel filling the base layer.

1984 The asphalt road south of Xiaomawan-Lijia reach is 7km wide and12m long, in which the bottom layer of 29cm lime soil is 4.5km thick and the bottom layer of 20cm gravel irrigation is 2.5km thick. The macadam stabilized layer is 8 cm thick and the surface layer is 5 cm thick. After opening to traffic, due to the instability of the bottom layer, the asphalt pavement is loose and cracked, accounting for 30 ~ 40% of the paving area, and serious engineering quality accidents have occurred.

At the end of 1986, there were 76 permanent bridges in Qingdao section of National Highway 204, with a length of 3668.5 meters. Among them: 5 large bridges with 928.6m, 34 medium bridges with 2368.4m, and 4 small bridges with 662m/seat. There are 352 culverts with 6354.5m, 5 flood control works with 878.3m and 75 protection works with 5769.5m..