Construction Technical Copy of Bearing Platform of Wujiang Super Major Bridge
2.1 Geographic location of the project Sinan Jianhe Expressway is the second longitudinal section of the "678" network in the Guizhou Provincial Framework Highway Network Planning - the middle section of Yanhe Rongjiang Expressway. It starts from Sinan, connects with Sinan Zunyi Expressway of Hangzhou Ruili Line, ends at Jianhe, and connects with Sansui Kaili Expressway of Shanghai Kunming Line, with a total length of 152.74km, a design speed of 80km/h, and a subgrade width of 21.5m, Two way four lane. It is a south-north traffic passage that runs through Tongren and Qiandongnan Autonomous Prefecture in Guizhou, and an important south-north traffic artery for the eastern region of Guizhou to Chongqing in the north, the Pearl River Delta in the south, and the Beibu Gulf Economic Zone. The project connects four counties, Sinan, Shiqian, Zhenyuan and Jianhe. Its construction is of great significance for driving the development of resources along the line, promoting regional economic development, and promoting the process of urbanization, so as to be included in the "High and Short term Key Construction Project of County County Expressway in Guizhou Province". This section is the second contract section, with the starting and ending mileage of K10+250 ～ K18+000, and the total length of the pipe section is 8.008km. The route of this contract section starts from Suiwan at the exit of the tunnel, crosses Wujiang River from northwest to southeast, crosses Qingdu River along the hillside, and then runs along the hillside terrace. The end point of this contract section is Yuxigou. See the following figure for the specific distribution: Figure 1 Plan of Sijian Jianhe Expressway Lot 2 Project 2.2 Overview of construction environment 2.2.1 Topography, geomorphology and environment The area where the route passes is located in the southwest of Wuling Mountain, which is mainly hilly and low middle mountain landform. The terrain is generally low in the north and high in the south, with the maximum elevation of 1212m, general elevation of 500~900m, and relative elevation difference of 60~140m. The overall mountain trend is northeast and north north frozen, Bedrock is mostly exposed and vegetation is not developed. 2.2.2 The rivers in the area where the hydrological environment project is located belong to rain source rivers in mountainous areas. The water system along the line is relatively developed. The larger perennial surface water bodies are mainly Wujiang River, Wuyang River, Qingshui River and other rivers and their tributaries. The surface rivers have deep valleys, narrow riverbed and large drop. In summer, the river water volume is abundant. In autumn and winter, the river water volume decreases sharply. Some river beds are exposed. Shallow metamorphic sandstone, slate and sandstone strata along the line contain fissure water. Karst fissure water is distributed in limestone strata. Pore water is distributed in the Quaternary alluvium and diluvium of Wujiang River, Wuyang River, Qingshui River and their tributaries. 2.2.3 Meteorological environment This area belongs to the subtropical humid monsoon climate zone. There is no severe cold in winter, no intense heat in summer, and there is abundant rainfall. The temperature is closely related to the geographical location and altitude. The annual average temperature varies with the altitude. The average annual temperature in various regions is 16.7~17.2 ℃, the extremely high temperature is 39.1 ℃, the extremely low temperature is - 8.1 ℃, the average sunshine is 1116.9h, and the maximum snow depth is 18cm. 2.2.4 Most of the geological and seismic environment sections along the route have exposed bedrock, and the exposed strata along the route from new to old are: Quaternary, Triassic, Permian, Silurian, Ordovician, Cambrian, Sinian, Proterozoic Banxi Group and other strata. The Cambrian and Triassic systems are the most developed, followed by the Proterozoic Banxi Group. The Quaternary system consists of alluvium, diluvium and eluvium, mainly consisting of high to low liquid limit clay, silt, sandstone layer and gravelly soil, which are distributed along the line with small thickness. The Triassic system consists of carbonate rock and sedimentary clastic rock, mainly consisting of dolomite, limestone, silty mudstone and red sandstone. In addition, the Permian dolomite, limestone and silty mudstone with coal seams are distributed sporadically. Under the comprehensive influence of regional stratigraphic and lithologic conditions, structural conditions, topographic conditions and meteorological and hydrogeological conditions, the adverse geological phenomena in the area are mainly identified as karst, dangerous rock collapse, three soft soils, bedding landslide, etc., and collapse, landslide, gob area, etc. that may be induced by human activities. According to the Seismic Ground Motion Parameter Zonation Map of China (2001), the seismic peak acceleration of the area where the route passes is less than 0.05g, and the characteristic period of the seismic response spectrum is 0.35s, which corresponds to the area where the original basic intensity is less than VI. 2.3 Main construction technical parameters (table) Statistical table of cushion cap No. Project name, model, quantity (piece) Remark 1 Wujiang Super Major Bridge 7 × 7 × 3 6 9 × 8.2 × 3 4 22.4 × 15.8 × 5 4 Number of main works of cushion cap No. Project unit Wujiang Super Major Bridge Remark 1 C30 concrete m3 8846 2 HRB335 reinforcement kg 970858.8 3 φ 6/φ 12 ribbed reinforcement kg 16270.6 4 Q235B steel pipe kg 6823.2
