Warmest congratulations on the successful completion of our company's shareholding reform!
2015-04-06
Our company, through a resolution passed at the shareholders' meeting on March 10, 2015, officially changed its name from "Luoyang Jiujiu Technology Development Co., Ltd." to "Luoyang Jiujiu Technology Joint-Stock Co., Ltd." The subsequent business registration update was completed on March 31, 2015, marking the official transformation of our company type from a "Limited Liability Company" to a "Joint-Stock Company."
On March 10, 2015, our company passed a resolution at the shareholders' meeting to change its name from "Luoyang Jiujiu Technology Development Co., Ltd." to "Luoyang Jiujiu Technology Joint-Stock Co., Ltd." The official business registration update was completed on March 31, 2015, officially transforming our company type from a "Limited Liability Company" into a "Joint-Stock Company."
NEWS
Technical Review of Slurry Pressure Balance Shield
Abstract: Slurry Pressure Balance Shield (SPB) represents a core type of closed‑face shield machine, which is widely adopted in tunnel engineering projects constructed in strata with high groundwater pressure and high permeability. This paper illustrates the working principle of SPB shields. Two major technical routes are classified according to pressure regulation modes: the direct‑control type (Japanese design) and the indirect air‑cushion control type (German design). A comparison is conducted regarding control logic, pressure stability and stratum adaptability between the two machine types. The excavation‑face stabilization mechanism governed by the coupling effect between filter cake and slurry pressure is analyzed. Technical comparison with Earth Pressure Balance (EPB) shields is also performed, providing references for shield machine type selection and construction‑technology research. 【This article is compiled for popular science purposes in the industry. Part of the technical data refers to publicly available professional literature.】
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.】
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139, Fengrun East Road, High-tech Development Zone, Luoyang City, Henan Province, China
