March 14, after 15 days of intensive construction, the last arch rib of Zhenglong Hongshui River Bridge, which was invested and constructed by Guangxi New Development Transportation Group Co., Ltd., a directly affiliated enterprise of Guangxi Beibu Gulf Investment Group Co., Ltd., and constructed by Guangxi Road Construction Engineering Group Co., Ltd. (Hereinafter referred to as "Guangxi Road Construction Group"), was completed. So far, the main chord pipe of the arch rib of the whole bridge has completed the pouring construction, and will soon enter the stage of lattice beam hoisting construction.
Zhenglong Hongshui River Bridge. Zhou Yansong's
Zhenglong Hongshui River Bridge is a key control project of Wuxuan-Laibin-Heshan-Xincheng Highway. The total length of the bridge is 1404 meters, the main bridge span is 316 meters, and there are 8 main chord pipes of the arch rib of the whole bridge, which are divided into four times of pumping. A total of 2454 cubic meters of C60 self-compacting concrete need to be poured. The two-stage relay pumping process is adopted, following the principle of first inner side, then outer side, first lower chord and then upper chord. In-
pipe concrete pouring construction is another important process after the arch rib closure of Hongshui River Bridge in Zhenglong, which is the key link to form the concrete-filled steel tube structure, and the most important thing in its construction is to ensure the quality of concrete pouring. For this reason, Wuxin 2-1 Branch carried out the research on the mechanism of C60 self-compacting concrete in the pipe in advance, optimized the concrete mix proportion through repeated tests, and innovatively adopted the remote real-time monitoring system of concrete pumping quality in the whole time domain to the concrete pouring construction of the main chord pipe of the whole bridge. Group photo of
construction personnel. Zhou Yansong's full time domain remote real-time monitoring system for
concrete pumping quality can collect the pressure value of concrete slurry on the pipe wall in real time during pumping, so that technicians can accurately monitor and control the effect of pumping pressure, progress and quality through feedback data, which is conducive to timely adjustment of construction rhythm and process, so as to improve the quality of concrete pumping. The whole process of concrete pumping construction can be monitored in real time, traced in the later period, prevented before blocking and traced after blocking. This is the first comprehensive application of this technology in concrete pouring construction in the same industry, and also a major breakthrough in the intelligent informatization of steel tube concrete pouring construction process. In the process of
pouring, Wuxin 2-1 division closely links up the construction process, and the construction process of discharging, testing, discharging and pumping is completed at one go, which avoids the impact of objective conditions on concrete performance to the greatest extent and effectively guarantees the progress and quality of concrete pouring. After professional testing, the average wave velocity of concrete density in the main chord pipe of the arch rib of the bridge is more than 4500m/s, which meets the design requirements, achieves high standard and high quality pouring, and achieves phased results in the construction of the bridge.
Technicians control the progress of concrete pouring by knocking. Photograph
by Zhou Yansong Since the resumption of work and production after the year, the construction site of Zhenglong Hongshui River Bridge of Guangxi Road Construction Group has been surging with the upsurge of "a good start", showing a competitive posture in the warm and cold spring, and 60 construction workers are working hard to grasp the progress. With the completion of arch rib concrete pouring construction, the grinding and welding of arch rib joints and the loosening of buckle cables are also completed synchronously; the assembly construction of lattice beams is also in progress in an orderly manner, with the current progress reaching 75%. Next, Wuxin 2-1 Branch will speed up the construction progress of suspender installation, open up a new situation of lattice beam hoisting construction as soon as possible, and charge towards the goal of opening the whole bridge to traffic.
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