Main Composition and Technical Characteristics of Earth Pressure Balance Shield Machine

Abstract: The earth pressure balance (EPB) shield is mainstream equipment for urban tunnel construction. This article sorts out the composition and technical features of core systems of the EPB shield, including cutterhead, soil conditioning, muck‑removal conveying, grouting & sealing, guidance and monitoring. It analyzes component functions and selection points under various working conditions for industry‑wide technical exchange. 【This article is compiled for popular science purposes in the industry. Part of the technical data refers to publicly available professional literature.】

Making Debut at the 1st Large‑Diameter Shield Summit: Luoyang Jiujiu Technology’s Rock‑Breaking Disc Cutters Safeguard the World’s Longest Subsea High‑Speed Railway Tunnel

Abstract: On August 29, the 1st Large‑Diameter Shield Summit convened in Ningbo, Zhejiang. The delegation from Luoyang Jiujiu Technology Co., Ltd. attended the event, conducted technical exchanges with industry experts on intelligent shield tunneling, and highlighted the company’s cutting‑tool technical achievements and engineering practices applied in the Jintang Subsea Tunnel of Ningbo‑Zhoushan Railway.

Special Drilling Equipment and Supporting Components

Abstract：This paper systematically elaborates the structural characteristics, core parameters and safety design criteria of nine types of special drilling equipment and supporting components including derricks, pulley blocks, drilling hooks and winches. It compares the performance differences, advantages, disadvantages and applicable working conditions of various equipment, analyzes the influences of steel wire rope threading technology, drill pipe materials and connection joint forms on drilling operations, and summarizes the development trends of equipment lightweighting, modularization and rapid assembly. The research can provide a reference for equipment selection and safe construction of engineering drilling.