Lixi Barrage Consolidation and Reconstruction Project
Lixi Barrage is one of cascade development projects for Liuxi River. Located at the junction between Lixi Village, Huadong Town, Huadu District on the lower reach of this River and Zhuliao Town of Baiyun District, it is multi-purpose hydro-engineering predominated by irrigation and combining power generation and water delivery. The Project started in 1966 was completed and put into use in 1970. That is, more than 40 years have passed since its operation. Due to limitations of the age and other conditions, it is subjected to low standards so that there exist some potential safety hazards. According to safety assessment related, the Barrage has been rated as a third class sluice.
Such a Consolidation and Reconstruction Project primarily aims at rebuilding a seepage-proof system, a lock chamber and a service bridge in the upstream together with a downstream primary stilling basin and newly setting up an automatic control system, a safety monitoring system and a video monitoring system, etc..
Lixi Barrage Consolidation and Reconstruction Project (involving its main body — Phase Two) is divided into two unit programs. One is water release and inlet sluice unit project; and, the other is control center unit engineering. As for the former, it is a large type-2 water gate ranking Level 2. In addition, grades of its key constructions, secondary structures and temporary buildings are 2, 3 and 4 respectively. Regarding the service bridge, it is designed in line with class-Ⅱ vehicle load for expressways. The designed flood level conforms to a 50-year standard and the peak discharge is designed to be 2270m3/s. By contrast, check flood level with a peak discharge of 2560m3/s has been up to a 100-year criterion. According to design for control center unit engineering of this Project, its service life is 50 years and safety level of architectural structure is 2. Fortification intensity of collapse is at 7 degrees and the basic earthquake acceleration designed is 0.1g. Moreover, design earthquakes are classified into one, group seismic category of buildings is Class-C, seismic grade of the structure ranks the third, and the wind velocity pressure is 5KN/m2. As regards ground roughness and fire resistance level of structures, they are at Class-B and Level 2 separately.
Construction of the Project started in October 2011. For Lixi Barrage Consolidation and Reconstruction Project (involving its main body — Phase Two), intermediate acceptance of stage-one and stage-two water supply was carried out on March 29, 2012 and March 21, 2013 respectively. Furthermore, the entire Project officially passed acceptance check in March 2014 and it was rated as an excellent project.