On March 25, the Shenzhen Jingxin Reservoir Reinforcement Project undertaken by the Third Bureau of Hydropower (Sinohydro Bureau 3) celebrated a "double blessing": the "Jingxin Jinli No." pipe jacking achieved breakthrough, and the main structure of the intake tower was successfully capped, laying a solid foundation for the impoundment acceptance of Jingxin Reservoir.

The Shenzhen Jingxin Reservoir Reinforcement Project is a major project of Shenzhen, a key project of the Shenzhen Water Authority, and an important livelihood water conservancy project. The reservoir's main functions are water supply and flood control, while also accommodating irrigation, environmental protection, and ecological water replenishment, making it a comprehensive water conservancy hub project. Once completed, the project will greatly enhance the water resource regulation capacity of the basin, improve the regional climate, and be of great significance for peak shaving and staggering, water storage and irrigation, and flood control and drainage.

Since the start of construction, the project team has made coordinated arrangements and precise coordination, adopting synchronized joint control in project quality, safety, environmental protection, and progress, and carrying out construction in strict accordance with drawings and construction specifications. In response to various construction challenges encountered during the process, the project team prepared in advance, held multiple construction scheme seminars, and formulated special plans to overcome one difficulty after another.

During the pipe jacking construction of "Jingxin Jinli No.," facing a granite stratum with surrounding rock hardness of up to 140 MPa, the ultra-hard rock caused severe wear to the pipe jacking machine's cutters during advancement, which once hindered construction. The project department adjusted the cutter material according to the rock type, reduced the jacking force by adapting cutters to rock changes, and combined this with a construction method based on the slurry balance principle, enabling the pipe jacking machine to maintain optimal friction and impact resistance at all times and fully resolving this technical challenge. For construction control in confined spaces, information technology was introduced for real-time monitoring of the entire construction process and real-time gas monitoring inside the tunnel with over-limit and overtime warnings, ensuring construction safety. In view of the narrow construction site, the positions of crane stations, pipe material storage, and mud pits were rationally arranged and planned. To address the accuracy of pipe jacking construction, the project department formulated the "Implementation Plan for Measurement and Deviation Correction of Pipe Jacking Engineering," and during construction strictly followed the plan with technical measures such as frequent measurement and frequent deviation correction, ensuring the smooth and precise breakthrough of the pipe jacking works.

During the construction of the main structure of the intake tower, in response to the delay in intake tower construction caused by the impact of surrounding rock on pipe jacking, the project department actively communicated with the designer, supervisor, and owner. By adding a pipe jacking receiving shaft, the problem that intake tower and pipe jacking construction could not proceed simultaneously was solved, ensuring the successful capping of the hoist room of the intake tower main structure.

The smooth realization of the "two major milestones" was highly praised by the designer, supervisor, owner, and other parties. The project team will continue to focus on the impoundment goal, reverse the schedule, optimize the construction organization, and redouble its efforts to ensure that subsequent tasks are completed on schedule, contributing the strength of Sinohydro Bureau 3 to the early supply of water from Jingxin Reservoir to the Dapeng area.