Maoming, guangdong (wu zhenqi haohao, zhao yingjie and duan xiaohui) recently, the first cross-border expressway in the mountainous area of western guangdong province was built by the first company of China railway 18th bureau group. & ndash; Yunmao high-speed zhuhualing tunnel through the right line, the manual excavation of all the piles completed. The project has been organized by the owner in the labor competition activities won the first prize, the second prize, the first prize, the first prize of sub-project evaluation, the safety site demonstration unit and many other awards.

The TJ8 contract section of yunmao expressway, contracted by China railway 18th bureau group no.1 company, has a total length of 7.175km, all of which are located in the long uphill climbing section. The subgrade length is 1600 meters, and the bridge to tunnel ratio is 77.64%. Among them, the total pile foundation is 546, and the total number of manually dug pile is 495, accounting for 90.7%.

YunMao high-speed TieShiBaJu group in a company project manager li He Long introduction, as all the construction difficulty is one of the biggest blocks, steep terrain, construction conditions, banyan, bamboo wooden bridge, xiangshui bridge YunDaQiao, fir ping bridge, spreading heads the entire tin, banpo neolithic village construction road construction difficult, because there is no construction operation in rig can't reach the designated position, so most of them adopt artificial dig-hole pile. Compared with the construction of the drilling rig, the manual excavation pile has a large amount of safety and protection engineering, and the risk factor of workers' underground operation is high. At the same time, the rock layer is mostly granite, the stone is relatively hard, the geological structure of pile foundation is complicated, the consumption of pyrotechnics is too high, the measure is short and other factors greatly increase the construction difficulty and cost. Through scientific organization, the project department has completed the construction of manually excavated piles for TJ8 of yunmao expressway, marking that the bridge construction of the project will enter a new construction stage.

Bamboo tile ridge tunnel length 3530 meters, of which the right line length of 1773 meters, are all on the node project, designed to four lanes separated tunnel, tunnel through low mountain tectonic erosion landforms, terrain ups and downs, nearly parallel imports and terrain and bias exists, the upper for Y406 township roads, exports and contour line small Angle intersection and bias exists. Fracture rock mass is relatively developed, there are fracture zone, ductile shear zone, geological structure is complex, the water table is high, construction is very difficult. Since the entrance, a company's yunmao high-speed project department carefully organized planning, reasonable allocation of personnel, in the premise of ensuring safety, grasp the construction progress, to ensure construction quality. The successful completion of zhuhualing tunnel opened up an important channel for the follow-up construction of yunmao TJ8 project.

Up to now, the main projects undertaken by the first company of the 18th bureau group of China railway co., LTD have made good progress, and the roadbed earthwork projects have all been completed. Culvert works completed; The steady progress of pile foundation, bearing platform, tie beam, cylindrical pier, hollow thin-walled pier and tunnel project in bridge engineering has laid a solid foundation for the smooth opening of yunmao expressway.

The route of yunmao expressway is 129.7 kilometers in length. It is designed and built according to the standard of two-way four-lane. It starts from yunfuluoding in the east and connects with luchuan in guangxi in the west. When completed and opened to traffic, the distance traveled from xinyi to guangzhou in the pearl river delta will be shortened by about 40 kilometers and the time will be shortened by nearly two hours. Yunmao expressway is an exit channel from the mountainous area of western guangdong province. In the east, it can connect cities such as the pearl river delta through the expressway network of guangdong province, and in the west, it can connect the beibu gulf economic zone through the planned expressway of guangxi province, greatly shortening the distance between the mountainous area of western guangdong province and the cities of the beibu gulf economic zone.
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