Breaking ground with proven strength, conquering rock with might! Stepping onto the construction site of Xixiang Park Station on Shenzhen Metro Line 15, the most eye-catching sight amid the bustling scene is a pair of towering "SANY red" machines reaching from sky to ground — the SANY SDC120 dual-wheel trench cutter and the SR415R rotary drilling rig. This "golden combination" of SANY drilling and trenching equipment has been working tirelessly here day after day, becoming the main force for the project's diaphragm wall construction and repeatedly pushing the construction "progress bar" forward with outstanding performance.

Located at Xixiang Park Station on Shenzhen Metro Line 15, the project has now entered the retaining structure construction phase, with approximately 200 diaphragm wall panels for the main structure. The trench panels and wall thickness are 6 meters and 1 meter respectively, with a depth of 28.4 meters and a rock-socketed depth of about 10 meters.

According to construction personnel, the project's strata contain a variety of soils including plain fill, mucky clay and sandy cohesive soil, while completely weathered granite, soil-like strongly weathered granite and blocky weathered granite are distributed alternately. The natural compressive strength of the rock exceeds 100 MPa at its highest and is unevenly distributed, with local faults present. The complex geology poses considerable obstacles to the project's diaphragm wall construction and places severe demands on equipment trenching accuracy and cutting speed; at the same time, a series of unfavorable factors such as densely distributed utilities, large excavation volumes and a complex, busy surrounding environment have become "mountains" weighing on the construction contractor.

"To ensure the progress and final quality of the project's diaphragm wall construction, after much consideration we ultimately chose SANY equipment." Facing such an arduous battle, the project owner ultimately selected the SANY SR415R rotary drilling rig for pilot hole drilling and the SDC120 dual-wheel trench cutter for trenching. Facts have also proven that this "golden combination" of drilling and trenching lived up to the client's trust in the SANY brand.

Since entering the site, the SANY drilling and trenching combination has worked tirelessly day after day, adopting various combined drilling and trenching techniques to press the "fast-forward button" on the project's diaphragm wall construction. The SR415 is a classic large-triangle-structure drilling rig, offering greater stability in large-hole, deep-pile hard rock strata. The SR415 rotary drilling rig fully leverages SANY equipment's "stability + efficiency" advantages; with powerful and sustained power output and an intelligent mast verticality adjustment system, it effectively ensures borehole wall stability and hole-forming quality during drilling, while the perfect matching of core capabilities such as crowd force, torque and pull force also achieves steady improvement in drilling efficiency, helping the project owner crack the hard nut of "drilling into rock."

The trenching performance of the SANY SDC120 dual-wheel trench cutter is equally impressive. During days of continuous construction, the SANY SDC120 dual-wheel trench cutter's advantages — high rock-cutting efficiency, high spoil removal efficiency, stable micro-feeding and a high degree of intelligence — have effectively ensured trenching quality and efficiency, earning high praise from the project owner. According to data recorded by on-site operators for a certain 28.4-meter trench panel, in rock with a strength of about 100 MPa, the equipment's average comprehensive cutting efficiency reached 50mm-60mm per hour, completing a 6-meter trench panel in just 4-5 days. As of mid-June, 8 trench panels had been completed with high quality, ensuring the project's progress stays on schedule.

With powerful rock-breaking attributes and efficient construction capabilities, SANY underground engineering equipment "frequently appears on screen" in Shenzhen metro projects, contributing indispensable equipment support to diaphragm wall works at major stations. In the future, SANY Piling Machinery will continue to fight side by side with construction clients across various regions, injecting strong new-quality momentum into China's transportation infrastructure cause with internationally first-class hardcore equipment strength.