Guangle Expressway made breakthrough progress

At 14:18 on June 30th, No. 2 Pier 44 meters high on the left line of Xianshuihe 1# Bridge contracted by the China Railway Construction 11th Bureau Group Company and built on the 1st Company of the Guangle Expressway successfully completed the capping process, marking the Guangle Breakthrough progress was made in the construction of another difficult and difficult project along the highway.

Guangle Expressway T3 is located in the mountains of Dayaoshan. In the 13.345-kilometer pipeline area, only 9.61 kilometers were bridges and tunnels, and the total length of the bridges and tunnels accounted for more than 72%. There are up to 120 meters of the highest full-line bridge, there are also excavation sections on the slope of 85 degrees on the cliff, the depth of up to 55 meters of the longest pile of the entire line; both up to 141 kilometers of the longest construction access road There are also the largest cavern group tunnels and the largest section fracture zone tunnels. It can be said that all the construction problems of the T3 standard are all in one, becoming the most difficult and safest risk for the entire construction of the Guangle Expressway.

Among them, the lower part of Pier No. 2 of Xianshuihe No. 1 Bridge is a U-shaped bridge. The original designed pier was 20 meters high and was located on a cliff with a slope of more than 85 degrees. The 106 foundations of piles totaled 3,884 meters. Manual bored piles were used. Before carrying out the construction of pier 2#, the engineering technicians found that the actual terrain and design of the site were too different to each other after laying the piles. It was difficult to construct according to the original design structure. After consultation with the supervision, design, and owner-level management agencies, the company designed the pier for the second time to be converted into a two-pillar pier, in which two 2.4-meter-diameter pile foundations were used. The length of the piles was 55m, followed by 2.2m. The diameter of the column, the outer column height 44m, the inner column height 28m, between the column with two tie beam to connect.

Because of the steep slopes of the mountains, there is almost no foothold for manual digging pile construction. When the employees work, only one end of the 100-meter-long safety rope can be tied to the big tree at the top of the mountain, and one end is tied to the waist and is more than 100 meters high. The top of the hill slowly slipped down to the pile and drilled and detonated cautiously. A 20-cm wide half-moon platform was drilled. Then the concrete was poured to form a first-stage retaining wall platform, which in turn formed 2-3 layers of retaining walls. The platform is then used as a bolt to lock the platform. A steel scaffold is erected on the platform and the hoist is installed. After that, the pile foundation is artificially excavated. As the length of the pile is 55 meters deep, combined with the implementation of drilling and blasting, the air in the pile hole is thin and dirty. In order to ensure the occupational health and safety of construction workers, the construction personnel rotate frequently and the construction progress is not ideal. Due to the location of water-rich areas, there is a certain amount of water in the excavated piles, and the water must be pumped. The employees are often sweating and muddy. The dozens of tons of steel, cement, sand and other materials used for pile foundation infusion are completely carried by the employees' shoulders and shoulders, or transported by Hummer to the construction site again and again. Due to the narrow construction site, all the operation procedures basically depended on labor. The engineers and technicians had done detailed calculations and on-site checking. On average, the construction materials used for each meter of piles required more than 60 round trips. During the construction process, engineers and construction workers have done their best. The project department and the leading team of the division carefully organized, rationalized the processes, adhered to the follow-up work, strengthened the monitoring of the safety process, and eliminated all kinds of safety hazards in the bud to ensure the safe and smooth capping of the 2# pier.