The hottest Liugong ovim helps the world's first o

2022-09-20
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Liugong ouvim helps the opening of Hunan Aizhai bridge, the "world's first Overpass"

Liugong ouvim helps the opening of Hunan Aizhai bridge, the "world's first Overpass"

China Construction machinery information

Guide: a bridge flies over the high gorge, and the natural moat becomes a thoroughfare! Recently, the Hunan Aizhai bridge, known as the world's first overpass, was successfully opened to traffic, marking the completion of the Chongqing Hunan Expressway with a total length of more than 800 kilometers. The products and technologies of ovim company of Liugong group played an important role in the construction of the bridge. Short

a bridge flies over the high gorge, and the natural graben becomes a thoroughfare! Recently, the Hunan Aizhai bridge, known as the "world's first Overpass", was successfully opened to traffic, marking the completion of the Chongqing Hunan Expressway with a total length of more than 800 kilometers. The products and technologies of ovim company of Liugong group played an important role in the construction of the bridge

Aizhai bridge is a key control project of Jishou Chadong section of Changsha Chongqing Expressway. It crosses the Dehang Grand Canyon in Western Hunan, with a main span of 1176 meters and a bridge deck of 355 meters from the ground. The bridge has created four world firsts: first, it is the largest suspension bridge with Canyon span in the world at present; The second is to adopt the structural design scheme of complete separation of tower and beam for the first time; Third, for the first time, the "sliding method of Dynesys without the approval of the U.S. Food and Drug Administration" was used to erect steel trusses due to the lack of fusion of rails and cables; Fourth, the rock anchor sling structure is used for the first time, and carbon fiber is used as prestressed reinforcement. Due to these achievements, Aizhai bridge was praised by Feng Maorun, the former chief engineer of the Ministry of communications, as one of the two bridges with truly original technology in China. Among these original technological achievements, ovim company of Liugong group has made significant contributions

one of the contributions: ovim provided key equipment and technology for the successful implementation of the "rail cable sliding method". Aizhai bridge adopts steel truss stiffening beams, with a beam height of 7.5 meters, a beam width of 27 meters, and a segment beam length of 14.5 meters. The whole bridge has 69 segments, the standard segment weighs 125 tons, and the middle segment weighs 240 tons. Due to the dangerous terrain of the bridge site and the extremely inconvenient traffic, the erection of the steel truss girder of the bridge has become a world-class problem. The bridge builders creatively put forward the erection scheme of "rail cable sliding method", and ovim company cooperated with the construction unit to develop and produce the key components of the rail cable sliding method - beam trolley and saddle, and developed the first domestic full hydraulic cable-loaded crane with independent intellectual property rights for the vertical lifting of beam segments, laying a good foundation for the smooth realization of this scheme. The project team worked together with relevant construction units to complete the erection task in only 3 months, saving the construction period of nearly 5 months compared with the conventional erection method

contribution 2: the "bending beam replaceable anchorage system" developed by ovim company has been applied to the bridge for the first time. The anchorage system is a structure that connects the main cable and the anchorage pier of the suspension bridge, and transfers the load from the main cable to the anchorage pier. Its stress is complex, and it is the lifeline engineering of the suspension bridge. In the past, the anchorage system is usually a permanent structure that cannot be replaced. Because the construction quality of pipe grouting is difficult to ensure, it is easy to affect the significance of prestressed steel insulation materials and the corrosion resistance durability of stranded wires. For the first time, the bridge anchorage adopts an unbonded and replaceable prestressed system, which successfully solves this problem

contribution 3: the large rock anchor cable developed by ovim company was applied to suspension bridges for the first time, which could not meet the output requirements set by the factory at the beginning. Because Aizhai bridge uses a tower beam separated suspension bridge structure, the length of the steel truss is less than the center distance of the main tower, the main cable has no sling area, and the sling unloading stress is zero, which will also have an adverse impact on the stress of the steel truss of the bridge. Therefore, since the main machine of the bridge needs self-test after startup, the rock anchor sling structure of ovim company is set at Jishou bank and Chadong bank as regulators to balance the stress on the main beam

contribution 4: the carbon fiber prestressed anchor cable developed by ovim company was first applied to the anchoring of rock anchor base. According to the research and test, the Aizhai bridge adopts the high-performance carbon fiber prestressed anchorage system of ovim company. Compared with the traditional steel strand, the carbon fiber material has the characteristics of light weight, high strength and corrosion resistance. This technology provides a full guarantee for the safety of the bridge

in addition, in order to monitor the safety of the rail cable system in the process of beam transportation by the rail cable sliding method, the project also adopts the monitoring technology of fiber Bragg grating intelligent steel strand and low height force measuring sensor invented by ovim company to monitor the rail cable force

the successful opening of Aizhai bridge marks a major breakthrough in China's bridge construction technology. The successful application of a number of technologies and products of Liugong ovim company in the bridge means that the company has taken another big step towards the strategic goal of "being a leading and internationally renowned system solution provider in the field of prestress in China"

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