Henan: Closure of Yunmengshan Bridge on Provincial Highway 317
April 18, 2023
August 19, 2022，The Zhengzhou Transportation Bureau is responsible for the Shanghai Highway Bridge under the Tunnel Stock Company.（Group）Limited company（Abbreviated as Shanghai Luqiao）ConstructedSSuccessful Closure of Yunmengshan Bridge in the Reconstruction Project from Xinzheng Airport to Xinmi in Zhengzhou on Line 317。
Yunmengshan Bridge is located in the downstream of Yunmengshan Reservoir in Xinmi, Zhengzhou.，It's a provincial roadS317 Xinzheng Airport to Xinmi Reconstruction Project（Abbreviated Provincial Highway 317 Project）Key node project。The main bridge span is 95+175+95 meters，Full bridge length 581.5 meters，The main span is 175 meters.，It is the largest main span under construction in Henan ProvinceTRigid Frame Bridge。Closure of Yunmengshan Grand Bridge，It has laid a solid foundation for the main line of Xinmi Section of Provincial Highway 317 Project.。
Closure of Yunmengshan Bridge is constructed by cantilever pouring with hanging basket，Beam height of No.0 block of box girder of main bridge 11.2 meters，The mid-span beam is 5m high.，Single box and single room design。The construction is difficult，The risk factor is high，There are high requirements for project management ability and professional and technical ability.。
The project department and Zhengzhou University jointly set up a scientific research team.，AdoptBIMTechnology、UAV oblique photography technology to tackle key technical problems，Set up a research project“Long-span Continuous Rigid Frame Bridge Based on Long-term Performance Prediction，Research and Application of Construction Strategy”，Improvement of crack resistance and durability of concrete using polypropylene fiber concrete，Apply for 2 invention patents，1 provincial-level construction method，Published 3 papers，It has achieved a new breakthrough in combining theory with practice.。
Zhengzhou Traffic Basic Quality Inspection Station Strict Project Safety and Quality Supervision and Management，The construction unit tries to optimize the construction technology in the construction process.，Jointly create high-quality projects。Precise control of bridge settlement during construction、Creep，The main body of Yunmengshan Bridge is equipped with displacement meters and stress-strain meters.，Real-time observation of Yunmengshan Bridge“Body data”，Make timely technical adjustments to the problems that arise.，Strictly control the project quality。In terms of linear control，General conTractor、Supervisor、Before and after each concrete pouring by the construction monitoring unit，Three-party synchronous measurement review shall be carried out.，Independent measurements are used、Mode of joint review，Ensure the accuracy of data。
The closure of bridge requires high accuracy of survey control.，In order to accurately control the error，The Project Department is respectively tensioning the closure section、Jacking、Measurement and monitoring before and after pouring and at different temperatures，Evaluate the change in data of the closure section under different conditions。Considering the properties of thermal expansion and contraction of concrete，Choose the time of day when the temperature is the lowest for concrete pouring.，At the same time, water tanks are placed on both sides of the middle span to ensure the force balance.，While pouring concrete, the water tank shall be drained synchronously.，Concrete pouring is completed，The water tank is drained，The error of the closure section was successfully controlled within 2 mm.。
The Provincial Highway 317 project under the responsibility of Zhengzhou Transportation Bureau is located at the airport interchange of Xinzheng Airport Expressway.，The terminal point is located at Qinshui East Road on the west side of Yunmengshan Reservoir in Xinmi.，After the whole line is completed and opened to traffic，The time from Xinmi to Xinzheng Airport will be shortened to 30 minutes.，To promote the new secret、The regional economic development of Xinzheng and Zhengzhou Airport District plays a vital strategic role.。
In order to help Zhengzhou build a national central city，Tunnel Co., Ltd. has established the Central Plains Regional Headquarters of Shanghai Urban Construction.，Actively cooperate with the promotion of Zhongyuan projects under construction and planning。Provincial Highway 317 Project has been started since June 2020.，The participating units of the project take the initiative，Experienced Zhengzhou“7·20”Torrential rain，Overcome land acquisition and demolition、Difficulties such as pipeline protection and relocation。The subgrade works of Xinmi Section have been completed by 90%，In July, the pavement cement stabilized macadam has met the conditions for large-scale construction.，The main line bridge is basically completed，The closure of Yunmengshan Bridge was completed in August 2022.。
