Qilu Evening News Qilu One Point Reporter Zhou Huijiao Kang Yan Correspondent Li Chang'an Sun Gaoxiang
On April 15, the Yangliu Interchange Project, a project of inner ring elevated and connecting lines in Jining City, is undergoing the construction of pile foundations and piles, and it is expected that all pile foundation construction will be completed by the end of May, and the main line will be completed by the end of this year.
Pile foundation construction
Completed at the end of May
To the west at the intersection of Rencheng Avenue and Tongji Road, the section has been completely closed for construction, and the staff is carrying out tree transplantation and obstacle removal. Hundreds of meters to the west, three rotary excavators are under construction, and the construction personnel on the site are working hard and the machinery is rumbling.
"At present, there are more than 200 construction personnel entering the site, the construction of pile foundations and piles is underway, 6 rotary drilling rigs on the site are operating at the same time, 10-15 pile foundations can be poured every day, and more than 150 pile foundations have been poured so far; all pile foundation construction is expected to be completed by the end of May." Peng Zhaobin, chief engineer of the Yangliu Interchange Project, introduced that at present, the substructural team has entered 5 sites, and 2 can be completed every day, and 6 piles have been completed, and the testing and excavation of pile foundations are underway, and all pile construction is expected to be completed in June.
In view of the road closure and detour during the road construction period, Bian Wei, a staff member of the Urban Construction Key Project Construction Headquarters in the main urban area of Jining City, said that from April 6 to December 31, Rencheng Avenue (East Fourth Road to Tongji Road) and Ning'an Avenue (Yangjiahe Bridge to Ruyi Community Intersection) will be fully closed for construction.
During the construction period, the traffic vehicles can drive through the diversion road, and a new 7-meter temporary road will be built on the north side of the Yangjia River of Ning'an Avenue to meet the traffic needs of the general public. During this period, small and medium-sized buses under 2.9 meters can be detoured through the Yangliu Interchange. All other vehicles and pedestrians can detour from Torch Road, Changhong Road, Dongsi Road, Jinyu Road, Dayu West Road, North Second Ring Road, Tongji Road, Rencheng Avenue East Extension and other roads.
24 leagues 72 spans
Construction is difficult
Jining Inner Ring Elevated and Connecting Line Project - Yangliu Interchange Project belongs to the construction of the urban trunk road viaduct, the construction area of the flow of people, traffic density is high, "the project cast-in-place beams a total of 24 links 72 spans, a total of 12 crosses, 3 times across the Yangjia River, 4 times up and down cross construction, which means that the construction is more difficult, there are many safety hazards." Peng Zhaobin introduced that the project is buried in the top of the pile with a large burial depth, the total excavation depth of the foundation pit is greater than 5m, and the safety risk of deep foundation pit construction is high. The construction of pier columns and cover beams requires the erection of disc buckle frames, which are high-altitude operations and have extremely high safety risks.
At the same time, prefabricated small box girders, steel-concrete combination beams, steel box girders transport hoisting weight of 50 tons to 160 tons, lifting weight greater than 30 tons, transportation and hoisting process may have a certain safety risk to the surrounding construction operations, ground bridges, etc.
"Jining Inner Ring Elevated and Connecting Line Project - Yangliu Interchange Project starts from Tongji Road in the east, from the east bank of the Yangjia River on Rencheng Avenue in the west, from the intersection of Ruyi Community of Ning'an Avenue in the south, and from the north bank of the Yangjia River on Ning'an Avenue, with a total length of 4.8 kilometers." Bian Wei pointed to the renderings, the project has a total of four floors, a total of 8 ramps, of which the design speed of the straight ramp is 80km/h, the design speed of other steering ramps is 35km/h~40km/h, and the design speed is 50km/h.
After the completion of the project, it will greatly alleviate the traffic congestion in the morning and evening rush hours at the intersection of Rencheng Avenue and Ning'an Avenue, and is an important node of the interchange between Ning'an Avenue Expressway and Rencheng Avenue Expressway, an important part of the Jining Expressway system, and a key node for the construction of jining "ring shooting" system, which is of great significance to the construction of high-quality urban development.
On-site reinforcement processing
Shorten the transport distance
On the north side of the construction site, a steel processing area was established, and a steel processing area was established, "The steel processing area was established at the construction site, which shortened the transportation distance and improved work efficiency." Peng Zhaobin said that the project steel-concrete combination of small box girders and steel box girders are all welded and assembled by steel structure, which is a huge amount of welding for the processing plant, and the volume and weight of each section of the steel structure are larger, so the transportation and hoisting in the process are particularly critical, and some spans are more than 35m, and the installation is difficult, such as ensuring the quality of assembly (welding) is one of the difficulties of this section.
How to optimize the construction organization at the technical level and improve the construction efficiency is the focus of the technical department of the project. A total of 173 cast-in-place pier columns in the whole line, most of the piers are more than 10 meters in height, and most of them are vase piers, the pier columns are crisscrossed horizontally and vertically, the maximum spacing is only 25cm, according to the maximum length of the concrete vibrator, and in order to ensure that the concrete vibration is compacted, each pouring height can only be controlled within 10m, so most of the pier columns can be poured in 2-3 times, which greatly reduces the construction progress.
"In order to improve the construction efficiency, the engineering and technical department actively optimizes the construction organization according to the design drawings, designs different steel mold frames, completes the lashing and welding of all steel bars on the mold frame according to the design size and spacing, and uses large tonnage cranes for overall lifting; the top of the formwork is installed according to different models of special operating platforms, which is convenient for workers to connect and pour reinforcement on the platform, which greatly improves work efficiency." Peng Zhaobin said. The project department has established a "safety integral supermarket", through appropriate material rewards, to further spur and motivate the participating workers to take the initiative to strengthen the enthusiasm of safe production work, continuously improve the awareness of safe production of all employees, and effectively ensure the achievement of safety goals at all stages of the project.
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