Warm Congratulations on the Offline Completion of the Super-large-diameter "Guanyue" Shield Machine for Wuhan Lianghu Tunnel

2026-10-15

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.】

2026-10-13

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.】

2026-09-22

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.

2026-09-04

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.

2026-08-27

Principles for Drilling Equipment Selection and Composition System

Abstract: This paper elaborates six major principles for drilling equipment selection, introduces the composition systems of percussion drilling and rotary drilling equipment, and clarifies the selection basis and overall architecture of drilling equipment.

2026-08-12

Jet Reverse Circulation Well Flushing

Abstract：Combined with the domestic and foreign equipment parameters and the localization application status of drilling engineering in 2026, this paper systematically elaborates the working mechanism, complete set of equipment, technical indicators, applicable working conditions and process optimization development direction of the jet reverse circulation well flushing technology, providing theoretical and practical basis for the scheme selection of well flushing in shallow large-diameter drilling engineering.

2026-07-21

Pump Suction Reverse Circulation Well Flushing Method

Abstract: This paper introduces the pump suction reverse circulation well flushing technology, which realizes well bore desilting through negative pressure suction. It involves special equipment and two starting methods, among which vacuum negative pressure starting is the preferred one. This technology is energy-saving and efficient, suitable for medium-shallow water wells with a depth of 60–80 meters. The construction key points, restricted scenarios and acceptance standards such as sand content of water quality are specified.

2026-07-10

Air-Lift Reverse Circulation Well Flushing Method

Abstract: This paper elaborates the principle, complete supporting equipment and core parameters of air-lift reverse circulation well flushing technology, as well as field fault disposal methods, compares the advantages and disadvantages of two types of mixers, and provides standardized construction control indexes.

2026-06-25

Drilling Well Flushing Technology

Abstract：This paper introduces the three core functions of well flushing in drilling: cooling drilling tools, removing cuttings and cleaning the bottom, and supporting the wellbore. It expounds the characteristics and selection requirements of four types of well flushing media. The two mainstream well flushing processes, direct circulation and reverse circulation, are compared, their respective characteristics are analyzed, and the technical parameter control standards for the reverse circulation process are clarified, which can provide a reference for field drilling construction.

2026-06-12